v5.6.0-beta.2

* core: check ACK handling with return type

* fix ratchet sync

* add SQL Locked to dbBusyLoop

* rename

---------

Co-authored-by: Evgeny Poberezkin <evgeny@poberezkin.com>

.github/workflows/build.yml

@@ -75,7 +75,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Create release
-        if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-20.04'
+        if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-20.04' && matrix.ghc == '9.6.3'
         uses: softprops/action-gh-release@v1
         with:
           body: |

CHANGELOG.md

@@ -1,3 +1,54 @@
+# 5.5.3
+
+Agent:
+- notification token API also returns active notifications server.
+- support file descriptions with redirection and file URIs.
+
+Servers:
+- CLI commands for online key and certificate rotation.
+- Configure config and log paths via environment variables.
+
+# 5.5.2
+
+Extensible handshake for clients and SMP/NTF servers (ignore extra data).
+
+# 5.5.1
+
+SMP servers:
+- do not keep stats file open
+- additional stats about currently stored messages
+
+Agent:
+- support multiple notification servers (only one can be used at a time).
+- expire messages after "quota exceeded" error after 7 days (instead of 21 days previously).
+- stabilize message delivery, remove unnecessary subscription retries and traffic.
+- improve database performance for message delivery.
+- fix sockets/memory leak - a very old bug "activated" by improvements in v5.5.0.
+
+# 5.5.0
+
+Code:
+- compatible with GHC 8.10.7 to support compilation for armv7a.
+- migrate to `crypton` from deprecated `cryptonite` (the seed for DRG is now sha512-hashed).
+- use ChaChaDRG for all random IDs, keys and nonces, only using hashed entropy as seed.
+- more efficient transaction batching in SMP protocol client and server.
+
+Agent:
+- stabilize message reception and delivery, migrate message delivery to database queue.
+- additional event MSGNTF confirming that message received via notification is processed.
+- efficient processing of messages sent to multiple recipients with batched database transactions.
+- new worker abstraction for all queued tasks resilient to race conditions and some database errors.
+- many fixed race conditions.
+- background mode for iOS NSE.
+- additional error reporting to client on critical errors (to be show as alert in the clients).
+- functional api to get worker statistics.
+
+SMP/XFTP servers:
+- fix socket and memory leak on servers with high load (inactive clients without subscriptions are disconnected after set time of inactivity).
+- control port improvements.
+- fix statistics for stored queues, messages and files.
+- make writing to store log atomic (fixes a rare bug in XFTP server).
+
 # 5.4.0
 
 Migrate to GHC 9.6.3

apps/ntf-server/Main.hs

@@ -1,13 +1,14 @@
 module Main where
 
 import Control.Logger.Simple
+import Simplex.Messaging.Server.CLI (getEnvPath)
 import Simplex.Messaging.Notifications.Server.Main
 
-cfgPath :: FilePath
-cfgPath = "/etc/opt/simplex-notifications"
+defaultCfgPath :: FilePath
+defaultCfgPath = "/etc/opt/simplex-notifications"
 
-logPath :: FilePath
-logPath = "/var/opt/simplex-notifications"
+defaultLogPath :: FilePath
+defaultLogPath = "/var/opt/simplex-notifications"
 
 logCfg :: LogConfig
 logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
@@ -15,4 +16,6 @@ logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
 main :: IO ()
 main = do
   setLogLevel LogDebug -- change to LogError in production
+  cfgPath <- getEnvPath "NTF_SERVER_CFG_PATH" defaultCfgPath
+  logPath <- getEnvPath "NTF_SERVER_LOG_PATH" defaultLogPath
   withGlobalLogging logCfg $ ntfServerCLI cfgPath logPath

apps/smp-agent/Main.hs

@@ -35,6 +35,7 @@ servers =
 logCfg :: LogConfig
 logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
 
+-- Warning: this SMP agent server is experimental - it does not work correctly with multiple connected TCP clients in some cases.
 main :: IO ()
 main = do
   putStrLn $ "SMP agent listening on port " ++ tcpPort (cfg :: AgentConfig)

apps/smp-server/Main.hs

@@ -3,8 +3,8 @@
 module Main where
 
 import Control.Logger.Simple
+import Simplex.Messaging.Server.CLI (getEnvPath)
 import Simplex.Messaging.Server.Main
-import System.Environment
 
 defaultCfgPath :: FilePath
 defaultCfgPath = "/etc/opt/simplex"
@@ -21,6 +21,3 @@ main = do
   cfgPath <- getEnvPath "SMP_SERVER_CFG_PATH" defaultCfgPath
   logPath <- getEnvPath "SMP_SERVER_LOG_PATH" defaultLogPath
   withGlobalLogging logCfg $ smpServerCLI cfgPath logPath
-    
-getEnvPath :: String -> FilePath -> IO FilePath
-getEnvPath name def = maybe def (\case "" -> def; f -> f) <$> lookupEnv name

apps/xftp-server/Main.hs

@@ -1,13 +1,14 @@
 module Main where
 
 import Control.Logger.Simple
+import Simplex.Messaging.Server.CLI (getEnvPath)
 import Simplex.FileTransfer.Server.Main
 
-cfgPath :: FilePath
-cfgPath = "/etc/opt/simplex-xftp"
+defaultCfgPath :: FilePath
+defaultCfgPath = "/etc/opt/simplex-xftp"
 
-logPath :: FilePath
-logPath = "/var/opt/simplex-xftp"
+defaultLogPath :: FilePath
+defaultLogPath = "/var/opt/simplex-xftp"
 
 logCfg :: LogConfig
 logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
@@ -15,4 +16,6 @@ logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
 main :: IO ()
 main = do
   setLogLevel LogDebug -- change to LogError in production
+  cfgPath <- getEnvPath "XFTP_SERVER_CFG_PATH" defaultCfgPath
+  logPath <- getEnvPath "XFTP_SERVER_LOG_PATH" defaultLogPath
   withGlobalLogging logCfg $ xftpServerCLI cfgPath logPath

package.yaml

@@ -1,5 +1,5 @@
 name: simplexmq
-version: 5.4.0.7
+version: 5.6.0.2
 synopsis: SimpleXMQ message broker
 description: |
   This package includes <./docs/Simplex-Messaging-Server.html server>,
@@ -65,8 +65,7 @@ dependencies:
   - sqlcipher-simple == 0.4.*
   - stm == 2.5.*
   - temporary == 1.3.*
-  - time == 1.9.*
-  - time-compat == 1.9.*
+  - time == 1.12.*
   - time-manager == 0.0.*
   - tls >= 1.7.0 && < 1.8
   - transformers == 0.6.*
@@ -74,6 +73,7 @@ dependencies:
   - unliftio-core == 0.2.*
   - websockets == 0.12.*
   - yaml == 0.11.*
+  - zstd == 0.1.3.*
 
 flags:
   swift:

protocol/xftp-uri-request.txt

@@ -0,0 +1,16 @@
+Scheme name: xftp
+
+Status: Provisional
+
+Applications/protocols that use this scheme name:
+This scheme is used for URIs of XFTP (SimpleX File Transfer Protocol) servers,
+a client-server protocol for asynchronous file transfer via relays,
+preserving file meta-data (including size and name) and content privacy.
+
+Contact: Evgeny Poberezkin <ep@simplex.chat>
+
+Change controller: Evgeny Poberezkin <ep@simplex.chat>
+
+References:
+The syntax for server URIs in the provisional specification for SimpleX File Transfer Protocol:
+https://github.com/simplex-chat/simplexmq/blob/master/rfcs/2022-12-26-simplex-file-transfer.md#server-address-syntax

protocol/xrcp-uri-request.txt

@@ -0,0 +1,15 @@
+Scheme name: xrcp
+
+Status: Provisional
+
+Applications/protocols that use this scheme name:
+This scheme is used for URIs of controller sessions via SimpleX Remote Control protocol (XRCP),
+a protocol for remote access and management of hosts via insecure network.
+
+Contact: Evgeny Poberezkin <ep@simplex.chat>
+
+Change controller: Evgeny Poberezkin <ep@simplex.chat>
+
+References:
+The syntax for server URIs in the provisional specification for SimpleX File Transfer Protocol:
+https://github.com/simplex-chat/simplexmq/blob/master/rfcs/2023-10-25-remote-control.md#session-invitation

rfcs/2022-12-26-simplex-file-transfer.md

@@ -149,6 +149,19 @@ parts:
 
 This file description is sent to all recipients via normal messages, split to 15780 byte chunks if needed.
 
+### Server address syntax
+
+The server address is a URI with the following format:
+
+```abnf
+xftpServerURI = %s"xftp://" xftpServer
+xftpServer = serverIdentity "@" srvHost [":" port]
+srvHost = <hostname> ; RFC1123, RFC5891
+port = 1*DIGIT
+serverIdentity = base64url
+base64url = <base64url encoded binary> ; RFC4648, section 5
+```
+
 ### Receiving file
 
 Having received the description, the recipient will:

rfcs/2023-09-12-second-relays.md

@@ -74,6 +74,8 @@ Below considers this design.
 
 5. SMP proxy should implement retry logic and hold messages while they are delivered. They also should return relay replies to the client. To avoid any additional traffic the client should just add "sent to proxy" status and only show "sent" once proxy returns the response from the destination relay - there should be no additional response from the proxy confirming acceptance to delivery.
 
+This would also reduce the difference in how the traffic looks to the observer - sending via proxy may look similar to sending to the usual server (which can be further supported by friendly destination relays that could add latency for direct requests and reply quickly when response came via proxy and be undermined by hostile relays that would introduce some latency pattern to help traffic correlation. The latter problem can be mitigated by having a fixed response latency from proxy that may be "come back later for destination response").
+
 6. Sending messages to groups have to be batched in the client to avoid multiple requests for destination relay sessions - such requests can be batched to proxy, even though it leaks _some_ metadata - which destination relays are used by a given sender's IP address, it also reduces the overhead from proxies – it could be an option based on the privacy slider.
 
 6. SMP proxy may also increase utility and privacy of the platform:
@@ -89,7 +91,7 @@ Below considers this design.
 
 3. We probably should aim to avoid changing agent/client logic and see it instead as transport concern that can be dynamically decided at a point of sending a message, based on the current configuration.
 
-4. Configuration should probably allow to choose between not using proxies (particularly, during testing, when it would be the default), using proxies only for unknown relays, and using proxies for all relays (extra traffic, but more complex transport correlation). The clients can aim to use proxy from another provider, to reduce the risks of sharing the information.
+4. Configuration should probably allow to choose between not using proxies (particularly, during testing, when it would be the default), using proxies only for unknown relays, and using proxies for all relays (extra traffic, but more complex transport correlation - although randomizing this choice can be more beneficial to the transport privacy). The clients can aim to use proxy from another provider, to reduce the risks of sharing the information.
 
 ### SMP-proxy protocol
 
@@ -97,7 +99,7 @@ The flow of the messages will be:
 
 1. Client requests proxy to create session with the relay by sending `server` command with the SMP relay address and optional proxy basic AUTH (below). It should be possible to batch multiple session requests into one block, to reduce traffic.
 
-2. Proxy connects to SMP relay, negotiating a shared secret in the handshake that will be used to encrypt all sender blocks inside TLS (proxy-relay encryption). SMP relay also returns in handshake its temporary DH key to agree e2e encryption with the client (sender-relay encryption, to protect metadata from proxy).
+2. Proxy connects to SMP relay, negotiating a shared secret in the handshake that will be used to encrypt all sender blocks inside TLS (proxy-relay encryption). SMP relay also returns in handshake its temporary DH key to agree e2e encryption with the client (sender-relay encryption, to hide metadata sent to the destination relay from proxy).
 
 3. Proxy replies with `server_id` command including relay session ID to identify it in further requests, relay DH key for e2e encryption with the client - this key is signed with the TLS online private key associated with the certificate (its fingerprint is included in the relay address), and the TLS session ID between proxy and relay (this session ID must be used in transmissions, to mitigate replay attacks as before).
 
@@ -107,6 +109,10 @@ With 32 bits per key there will be ~1/1,000,000 false positives (see https://en.
 
 Given that the client chooses proxy it has some trust to, maybe this replay attack risk can be accepted.
 
+It is important that the same public key from destination relay is returned to all clients, so proxy does not need to repeat this request to know relays while the key did not expire, as using different keys for different clients would allow destination relays to correlate requests to the clients. A proxy that colludes with the destination relay can pass different public keys to the same client, but it is not changing threat model as colluding proxy can share information as well. It is also important that the client uses a new random key for each command, as using the same key would allow the destination relay to identify these commands as comming from the same user, and using a different key for each queue while would protect privacy of the user from the destination relay, would make it visible to the proxy how many different queues the client has on destination relay.
+
+*Unrelated cosideration for SMP protocol privacy improvement*: instead of signing commands to the destination relay, the sender could have a ratchet per queue agreed with the destination relay that would simply use authenticated encryption with per-message symmetric key to encrypt the message on the way to relay, and this encryption would be used as a proof of sender.
+
 4. Now the client sends `forward` to proxy, which it then forwards to SMP relay, applying additional encryption layer.
 
 5. SMP relay sends `response` to proxy applying additional encryption layer, which it then forwards to the client removing the additional encryption layer.
@@ -173,7 +179,7 @@ proxy_command = server / server_id / forward / response / error
 server = "S" address [relay_basic_auth] ; creates transport session between proxy and relay
 server_id = "I" relay_session_id tls_session_id signed_relay_key ;
     ; session_id is the TLS session ID between proxy and relay, it has to be included inside encrypted block to prevent replay attacks
-forward = %s"F" random_dh_pub_key encrypted_block
+forward = %s"F" random_dh_pub_key encrypted_block ; it's important that a new key is used for each command, to prevent any correlation by proxy or by destination relay
 response = %s"R" encrypted_block; response received from the destination SMP relay
 relay_session_id = length *8 OCTET
 error = %s"E" error

rfcs/2023-12-29-pqdr.md

@@ -0,0 +1,36 @@
+# Post-quantum double ratchet implementation
+
+See [the previous doc](https://github.com/simplex-chat/simplex-chat/blob/stable/docs/rfcs/2023-09-30-pq-double-ratchet.md).
+
+The main implementation consideration is that it should be both backwards and forwards compatible, to allow changing the connection DR to/from using PQ primitives (although client version downgrade may be impossible in this case), and also to decide whether to use PQ primitive on per-connection basis:
+- use without links (in SMP confirmation or in SMP invitation via address or via member), don't use with links (as they would be too large).
+- use in small groups, don't use in large groups.
+
+Also note that for DR to work we need to have 2 KEMs running in parallel.
+
+Possible combinations (assuming both clients support PQ):
+
+| Stage        | No PQ kem | PQ key sent | PQ key + PQ ct sent |
+|:------------:|:---------:|:-----------:|:-------------------:|
+| inv   | + | + | - |
+| conf, in reply to:   <br>no-pq inv <br>pq inv        | &nbsp;<br>+<br>+ | &nbsp;<br>+<br>- | &nbsp;<br>-<br>+ |
+| 1st msg, in reply to:<br>no-pq conf<br>pq/pq+ct conf | &nbsp;<br>+<br>+ | &nbsp;<br>+<br>- | &nbsp;<br>-<br>+ |
+| Nth msg, in reply to:<br>no-pq msg <br>pq/pq+ct msg  | &nbsp;<br>+<br>+ | &nbsp;<br>+<br>- | &nbsp;<br>-<br>+ |
+
+These rules can be reduced to:
+1. initial invitation optionally has PQ key, but must not have ciphertext.
+2. all subsequent messages should be allowed without PQ key/ciphertext, but:
+  - if the previous message had PQ key or PQ key with ciphertext, they must either have no PQ key, or have PQ key with ciphertext (PQ key without ciphertext is an error).
+  - if the previous message had no PQ key, they must either have no PQ key, or have PQ key without ciphertext (PQ key with ciphertext is an error).
+
+The rules for calculating the shared secret for received/sent messages are (assuming received message is valid according to the above rules):
+
+|   sent msg ><br>V received msg | no-pq       | pq      | pq+ct           |
+|:------------------------------:|:-----------:|:-------:|:---------------:|
+| no-pq                          | DH / DH     | DH / DH | err             |
+| pq (sent msg was NOT pq)       | DH / DH     | err     | DH / DH+KEM     |
+| pq+ct (sent msg was NOT no-pq) | DH+KEM / DH | err     | DH+KEM / DH+KEM |
+
+To summarize, the upgrade to DH+KEM secret happens in a sent message that has PQ key with ciphertext sent in reply to message with PQ key only (without ciphertext), and the downgrade to DH secret happens in the message that has no PQ key.
+
+The type for sending PQ key with optional ciphertext is `Maybe E2ERachetKEM` where `data E2ERachetKEM = E2ERachetKEM KEMPublicKey (Maybe KEMCiphertext)`, and for SMP invitation it will be simply `Maybe KEMPublicKey`. Possibly, there is a way to encode the rules above in the types, these types don't constrain possible transitions to valid ones.

rfcs/2024-01-26-file-links.md

@@ -0,0 +1,73 @@
+# Sending large file descriptions
+
+It is desirable to provide a QR code/URI from which a file can be downloaded. This way files may be addressed outside a chat client.
+Currently the `xftp` CLI tool can generate YAML file descriptions that can be used to receive a file.
+It is possible to pass such a description as an URI, but descriptions for files larger than ~8 MBs (two 4 MB chunks) would give QR codes that are difficult to process.
+A user can manually upload description and get a shorter one. Typically descriptions for files that are up to ~20 GBs would still be small enough to not require another pass, and that is way beyond any current (or, reasonable, fwiw) limitations.
+
+It is possible to streamline this process, so any application using simplexmq agent can easily send file descriptions and follow redirects.
+A file description with a redirect contains an extra field with final file size and digest so it can be followed automatically.
+
+The flow would be like this:
+
+- Sending:
+  1. Upload file as usual with `xftpSendFile`, get recipient file descriptions in `SFDONE` message.
+  2. Upload one of the file descriptions with `xftpSendDescription`, get its redirect-description in its `SFDONE` message.
+  3. Wrap in `FileDescriptionURI` and use `strEncode` to get a QR-sized URI.
+  4. Show QR code / copy link.
+- Receiving:
+  1. Scan QR code / paste link.
+  2. Use `strDecode` and unwrap `FileDescriptionURI` to get `ValidFileDescription 'FRecipient`.
+  3. Download it as usual with `xftpReceiveFile`, getting `RFDONE` message when the file is fully received.
+
+It is not necesary to use redirect description if original description can be encoded to fit in 1002 characters. Beyond this size there is a significant jump in QR code complexity.
+It is possible to call `encodeFileDescriptionURI` right after upload to test if the URI fits and skip step 2.
+When `xftpReceiveFile` receives a decoded description that lacks `redirect` field, the procedure for downloading a file is the same as usual - download chunks and reassemble local file.
+
+## Agent changes
+
+### Sending
+
+Sending and receiving files in agent is a multi-step process mediated by DB entries in `snd_files` and `rcv_files` tables.
+
+`xftpSendDescription` is tasked with storing original description in a temporary locally-encrypted file, then creating upload task for it.
+
+It is necessary to preserve redirect metadata so it can be attached to descriptions in the `SFDONE` message sent by a worker:
+
+```sql
+ALTER TABLE snd_files ADD COLUMN redirect_size INTEGER;
+ALTER TABLE snd_files ADD COLUMN redirect_digest BLOB;
+```
+
+### Receiving
+
+`xftpReceiveFile` gets a file description as an argument and knows if it should follow redirect procedure or run an ordinary download.
+For redirects it will prepare a `RcvFile` for redirect and then a placeholder, for the final file.
+Agent messages would be sent using the entity ID of the final file, which is stored along with redirect metadata in `RcvFile` for the redirect.
+
+```sql
+ALTER TABLE rcv_files ADD COLUMN redirect_id INTEGER REFERENCES rcv_files ON DELETE CASCADE; -- for later updates
+ALTER TABLE rcv_files ADD COLUMN redirect_entity_id BLOB; -- for notifications
+ALTER TABLE rcv_files ADD COLUMN redirect_size INTEGER;
+ALTER TABLE rcv_files ADD COLUMN redirect_digest BLOB;
+```
+
+These additional fields will exist on the file that is a short description to receive an actual description of the final file.
+
+While a description YAML is being downloaded, the application will get `RFPROG` messages tagged for final entity, containing bytes downloaded so far and the total size from the original file.
+When the description is fully downloaded, the worker would decode description and check if the stated size and digest match the declared in redirect.
+Then it will replace placeholder description in `rcv_files` for destination file with the actual data from downloaded description.
+Finally, instead of sending `RFDONE` for redirect, it hands over work to chunk download worker, which will run exactly as if the user requested its download directly.
+An application will then receive `RFPROG` and `RFDONE` messages as usual.
+
+## URI encoding
+
+File description URIs use the same service schema `simplex:` or its `https://simplex.chat` (or any custom host) equivalent as do contact links and can be extracted from text and processed the same way.
+The path section is `/file` (with an optional trailing `/`).
+The payload is encoded in the "fragment" part of the link, using `#/?`, followed by a query string.
+File description is encoded first in a YAML document, then URL-encoded in under the key `d`.
+An application may want to pass extra parameters not necessary to download a file. Those go in the `_` key, encoded as a JSON dictionary.
+
+An example link:
+
+`simplex:/file#/?d=chunkSize%3A%2064kb%0Adigest%3A%20OtpnXkECTW4a18Eots2m3O22maeOCMqPUX4ulugIjgMEJfCpTYc_-T257Uw7s9bW_F0G5WBg5BioBWd4Z_OoCw%3D%3D%0Akey%3A%20rNR8_2SJuH7Qve43gV3zszL0R6oY5HSdRZT_paB-wfE%3D%0Anonce%3A%202oKwfK-w75nwyWp8_1Lv6QnQonIRtJmG%0Aparty%3A%20recipient%0Areplicas%3A%0A-%20chunks%3A%0A%20%20-%201%3ATdvaxMnG2Ph1e3QCx3-rpA%3D%3D%3AMC4CAQAwBQYDK2VwBCIEILdErEICvgrBCajDLTX2h3LXyMB7z5vrtLa3XVigJuf-%3ANS46KuYdgOWs6dUeMp7p2oF8rBQ9wQ2Ez6TW6Y6gHg0%3D%0A%20%20-%202%3AH5SRbtKYrXWVXTthrkeWzw%3D%3D%3AMC4CAQAwBQYDK2VwBCIEIGeEPNLt7lUGPfplwsoJLCDFnbIc5Hm31kz5X6rWXmgu%3A7QNRI-gvFx9UM-baXp3YVDli9pcfh3HGFKDhsA9JQHY%3D%0A%20%20-%203%3A_xjukkIl9WZFryUXT0h_TQ%3D%3D%3AMC4CAQAwBQYDK2VwBCIEIIRFBaL1HvUfePvKLuggwUrC_q_ZHd7v08IL9jhM7teC%3Aid2lgLMMjTGsR8SUogJuRdLoEHAc5SDQKFDqlZRSuEY%3D%0A%20%20server%3A%20xftp%3A%2F%2FLcJUMfVhwD8yxjAiSaDzzGF3-kLG4Uh0Fl_ZIjrRwjI%3D%40localhost%3A7002%0Asize%3A%20192kb%0A&_=%7B%22k%22:%22test%22%7D`

rfcs/2024-02-03-deniability.md

@@ -0,0 +1,51 @@
+# Repudiation for message senders
+
+## Problem
+
+We use double ratchet protocol to send messages. One of its important qualities is the use of symmetric encryption with forward secrecy, when the new key to encrypt the message is rotated after each message. This provides senders ability to plausibly deny having sent some messages, without denying having sent others. While the recipients can prove to themselves that the message was indeed sent by the sender, because it was encrypted using authenticated encryption with associated data, the recipients cannot prove it to any third party - as the message could have been encrypted by themselves, as they also have the same symmetric keys.
+
+To receive the messages, the recipients agree a message queue with the senders, and the commands sent to this queue are signed by the senders using the cryptographic key (Edwards curve key) of which the public counterpart was shared with the recipient in the confirmation message of SMP protocol (this confirmation message itself is not signed).
+
+While it was never claimed that the messaging protocol provides deniability, the deniability is often mentioned as one of the important qualities of double ratchet algorithm used in the innermost layer of e2e encryption, so without explicit disclaimer of deniability limitations, it may be assumed by the users that the system as a whole provides the same level of deniability as the double ratchet algorithm, which currently is not the case.
+
+While societal understanding and legal acceptance of repudiation is arguable, there was less than a decade since this quality became widely available in Signal - legal systems take longer to evolve.  While the argument that the message was forged is unlikely to be accepted in the usual court cases with the ordinary people, it is likely to be considered in cases with high profile defendants, who can reasonably claim that they are the target of smear campaign and are being attributed something that they never sent - the statement that the message is forged is reasonable in such cases, and it provides plausible deniability, and the cryptographic experts invited to the hearing would attest to that.
+
+It’s important to both continue providing repudiation quality in communication systems, when it is appropriate, and also to educate the users about when it can be used as a reasonable defence strategy, thus improving privacy of communication and making digital off-the-record communications possible and understood both by the society and by legal systems.
+
+## Solution
+
+The proposed solution is to avoid the use of signature algorithm for server command authorization, and instead use authenticated encryption to authorize the commands sent to the server queues. If this protocol change is adopted, it could be used both for senders and recipients commands, both for consistency, and also to provide the deniability to recipients about executing any commands on the servers, in a similar way.
+
+The proposed approach is to use NaCl crypto_box that proves authentication and third party unforgeability and, unlike signature, repudiation guarantee. See [crypto_box docs](https://nacl.cr.yp.to/box.html):
+
+> The crypto_box function is designed to meet the standard notions of privacy and third-party unforgeability for a public-key authenticated-encryption scheme using nonces. The crypto_box function is not meant to provide non-repudiation. On the contrary: the crypto_box function guarantees repudiability. A receiver can freely modify a boxed message, and therefore cannot convince third parties that this particular message came from the sender. The sender and receiver are nevertheless protected against forgeries by other parties. In the terminology of https://groups.google.com/group/sci.crypt/msg/ec5c18b23b11d82c, crypto_box uses "public-key authenticators" rather than "public-key signatures.”
+
+DJB further writes in the link above:
+
+> If you were already planning to encrypt the message, using another key derived from g^xy, then you don't have to do any extra public-key work. A secret-key authenticator is easier to implement than a public-key signature, and it takes less CPU time to compute.
+
+So the proposed solution appears to have desired security qualities, without non-repudiation, that is undesirable in the context of private messaging.
+
+When queue is created or secured, the recipient would provide a DH key (X25519) to the server (either their own or received from the sender), and the server would provide its own random X25519 key per session. Then, either the authenticator will be computed in this way:
+
+```abnf
+transmission = authenticator authorized
+authenticator = crypto_box(sha512(authorized), secret = dh(client long term queue key, server session key), nonce = correlation ID)
+authorized = tlsunique correlationId queueId protocol_command ; same as the currently signed part of the transmission
+```
+
+The authenticator is smaller in size than currently used signature size, freeing ~34 bytes from the transmission.
+
+This allows to retain the protocol logic and make authentication scheme configurable, both by the clients and servers, e.g. some servers might be configured to use signature for non-repudiation, and clients may be configured to either agree or disagree to that, per conversation.
+
+There is no required change in SMP command syntax other than allowing X25519 key instead of Ed signature keys passed to the server in NEW and KEY commands. We could add support for migration of the existing queues to the new authorization scheme, but it is not strictly required, as the clients provide a mechanism to rotate the receiving addresses (currently manually, and once automated all queues will be rotated). On another hand, per queue key and identifiers rotation is cheaper than negotiating the new queue (it can be done between client and server, without the involvement of another party), and could be considered as an independent improvement.
+
+## Migration plan
+
+As this new scheme breaks backward compatibility, as the new scheme requires additional keys in protocol handshake, and current implementation does not support forward compatible header extension, we have to migrate in multiple steps, to minimize any disruption to the users.
+
+1. Upgrade clients for forward compatibility of the protocol handshake (ignore extra bytes) - 5.5.3.
+2. Add support for handshake and version negotiation to XFTP - 5.5.4 or 5.6.
+3. Upgrade clients to drop support of SMP earlier than v4 (batching) and also drop support of old double ratchet protocol and old handshake - 5.6.
+4. Upgrade servers to offer SMP v7 with support for new authorization - by the time 5.6 is released.
+5. Upgrade clients to require server support for SMP v7 / new authorization scheme and start using it - 5.7 or 5.8. At this point the old version of the servers will not be supported, as maintaining this backward compatibility would substantially increase the complexity and logic of the client - at the point of generating the key we do not even know which server version will be used.

rfcs/2024-02-12-encryption.md

@@ -0,0 +1,33 @@
+# Transmission encryption
+
+## Problems
+
+### Protection of meta-data from sending proxy
+
+The SEND commands and message queue IDs need to be encrypted so that sending proxy cannot see how many queues exist on each server.
+
+Correlation IDs need to be random and can be re-used as nonces so that the destination relay cannot use the increasing correlation IDs that are sent in v6 of the protocol to track the sender.
+
+###  Protection of the traffic from the attacker who compromised TLS
+
+Currently, even though different sending and receiving queue IDs are used, the attacker who compromised TLS could do statistical analysis and in this way correlate queue IDs of senders and recipients, and therefore correlate the senders and recipients.
+
+## Possible solutions
+
+1. Encrypt sent messages, other commands and their responses in the additional envelope, irrespective of whether proxy is used or not. In this case the requestion transmission could have this syntax:
+
+```abnf
+encReqTransmission = pubKey nonce encrypted(reqTransmission)
+reqTransmission = respNonce entityId command
+
+encRespTransmission = replyNonce encrypted(respTransmission)
+respTransmission = entityId command
+```
+
+The keys to encrypt and decrypt both the command and responses would be computed as curve25519 from the key sent together with command and server session key. For the requests, the nonce has to be random and sent outside of the encrypted envelopt, but for the response respNonce would be taken from inside of the encrypted envelope and it would also be used for correlating commands and responses. This way the attacker who could compromise TLS would not be able to correlate the commands and responses, and also observe entity IDs.
+
+2. The remaining question is to how encrypt and decrypt messages delivered not in response to the commands.
+
+The possible options are:
+- restore client session key only for that purpose, but do not forward this key to the destination proxy for sent messages. Then the messages can be sent with a random replyNonce and the key would be computed from session keys. The advantage here is that we won't need to parameterize handles as both client and server would have session keys. The downside that we would have to either somehow differentiate messages and responses, either by some flag that would allow some correlation or just by the absense of replyNonce in the lookup map - that is if the client can find replyNonce, it would use the associated key to decrypt, and if not it would use session key.
+- use the same key that was sent with SUB or ACK command. This is much more complex, and would only have some upside if we were to introduce receiving proxies (to conceal transport sessions from the receiving relays for the recipients).

rfcs/2024-03-03-pqdr-version.md

@@ -0,0 +1,92 @@
+# Migrating existing connections to post-quantum double ratchet algorithm
+
+## Problem
+
+Post-quantum variant of double ratchet algorithm represents an almost full-stack change affecting all parts of the protocol stack except client-server protocol (SMP):
+- double-ratchet end-to-end encryption: different encoding (additional large keys require byte-strings larger than 255 bytes with 2-byte length prefixes) and larger message headers (increased by ~2200 bytes).
+- agent-agent protocol: a smaller maximum message size to accomodate larger headers and to fit in 16kb blocks, reduced by ~2200 bytes for the messages and by almost ~4000 bytes for connection information.
+- chat protocol: also a smaller message size compensated by zstd comression of JSON messages.
+
+We want the versioning that achieves these objectives:
+- all changes in all protocol layers happen at the same time, when both clients support it.
+- ability to downgrade the clients to the previous version without losing connection.
+- ability to opt-in into this functionality via "experimental" feature toggle, that enables post-quantum encryption in connections when both contacts enable this toggle.
+
+To have ability to downgrade the clients we have two options:
+- roll-out this functionality in two stages: 1) roll-out clients support but do not enable the new version, and then 2) upgrade client version. The problem here is that the clients won't be able to opt-in into this experiment.
+- make offered range dependent on experimental feature being enabled. Currently we have an option to enable PQ encryption in agent API, and this option can be used as a proxy to maxium supported protocol version - if the option is passed, it can be seen as an indication that higher version range (or version) should offered (or accepted).
+
+## Solution
+
+Currently ratchet state stores version range. It's unclear what was the intended semantics of that version range - it simply stores the offered/supported version range at the time ratchet was initialised, but only a high bound is used to send in message headers, and it is never upgraded. In JSON this range is encoded as tuple (an array of two elements in JSON).
+
+We could continue using this range with the meaning of the lower bound to be "currently used ratchet version" and the meaning of higher boundary to be "maximum supported ratchet version". We could also use the version communicated in message headers to upgrade ratchet version, with the condition that upgrade should only happen if both sides want it. Currently it's defined by pqEnableKEM property in ratchet state. We could also make it more explicit by defining maximum version to which ratchet should upgrade. Given that irreversible upgrades are not very common, it is probably ok to keep it implicit.
+
+We can define a better type than VersionRange to reflect semantics of the range in ratchet (current/max supported range), but for backward compatibility it needs to be encoded in the same way as now.
+
+To summarize, the proposed solution for ratchet versioning is:
+- define ratchet versions as new type to include current and maximum allowed versions, where maximum allowed will be either the same or lower than maximum supported based on PQ option (in 5.6), and in 5.7 it will be changed to maximum supported, so version starts upgrading independently from PQ being enabled.
+- make encodings in ratchet depend on current version (in curent code it depends on max version).
+- include max allowed in message header.
+- upgrade current if in range on each new message if less than max and higher than current (same as we do for connections).
+- increase max allowed once PQ is enabled (only in 5.6). Make max allowed the same as max supported (global constant).
+
+```haskell
+data RatchetVR = RatchetVR
+  { currentVersion :: Version,
+    maxAllowedVersion :: Version
+  }
+
+instance ToJSON RatchetVR where
+  toEncoding (RatchetVR v1 v2) = toEncoding (v1, v2)
+  toJSON (RatchetVR v1 v2) = toJSON (v1, v2)
+
+instance FromJSON RatchetVR where
+  parseJSON v = do
+    -- this also verifies that v2 > v1 (although we could remove JSON instances for VersionRange)
+    VersionRange v1 v2 <- parseJSON v
+    pure $ RatchetVR v1 v2
+```
+
+For connections, we could also make version used for the purposes of encoding dependent on the PQ being enabled, and version for decoding taken from message header, but then we'd have to not only upgrade ratchets but the connection as well every time PQ mode changes.
+
+Another suggestion to ensure that correct version range is used in correct contexts could be:
+- using different newtypes for different version ranges.
+- define generic type class for version aware encoding that would also accept only specific type class for the version to use the correct range. This may be justified as there will be several version-aware encodings, and not just the protocol as now.
+
+```haskell
+class Ord v => EncodingV v a where
+  {-# MINIMAL smpEncodeV, (smpDecodeV | smpVP) #-}
+  smpEncodeV :: v -> a -> ByteString
+  -- default decode uses parser
+  smpDecodeV :: v -> ByteString -> Either String a
+  smpDecodeV = parseAll . smpVP
+  -- default parser decodes from length-specified bytestring
+  smpVP :: v -> Parser a
+  smpVP v = smpDecodeV v <$?> smpP
+```
+
+The version will be passed from currently agreed version, it may only change when message is received, not when message is sent. The version will not be extracted from the encoding itself as it happens now in ratchet encodings.
+
+## Various options how the problem can be simplified
+
+1. Do not support connection downgrade once both devices upgraded. If applied to all existing connections then it is a bad option, as it would disrupt some important conversations.
+
+2. Do not provide ability to opt-in into PQ encryption until v5.7 where it will be rolled out automatically. That is also suboptimal, as it won't allow announcing technology design and have testing outside of the team devices.
+
+3. The logic explained above where connection upgrade and downgrade is possible and applied to all existing connections if both parties consent to it. There are these important downsides:
+  - complexity of this logic
+  - regression risks when this logic is removed.
+  - some non-coordinated upgrades of existing, potentially important conversations, simply because two users opt-in into the experiment without any expectation that another side also opts-in.
+
+4. Apply upgrade/downgrade logic and enable PQ encryption as opt-in, based on the toggle in the UX, only for the new connections. This seems the least risky, and also simpler than option 3, as it would only apply to the new connections, and both users will have to enable experimental toggle prior to connecting.
+
+Option 4 seems the best trade-off, and has these sub-options regarding where it is controlled:
+a) in chat based on connection flag. Chat will pass PQ options only to connections that were created when experimental option was enabled.
+b) in agent - there will be additional logic to ignore PQ option for existing connections.
+c) both in chat and in agent.
+
+Option 4a seems better, as it would:
+- simplify agent code
+- minimise required changes when releasing v5.7 (as we do want that all direct and small groups connections migrate to PQ encryption at the time, without any toggles)
+- allow tests for connection upgrade in the currect code.

simplexmq.cabal

@@ -5,7 +5,7 @@ cabal-version: 1.12
 -- see: https://github.com/sol/hpack
 
 name:           simplexmq
-version:        5.4.0.7
+version:        5.6.0.2
 synopsis:       SimpleXMQ message broker
 description:    This package includes <./docs/Simplex-Messaging-Server.html server>,
                 <./docs/Simplex-Messaging-Client.html client> and
@@ -51,6 +51,7 @@ library
       Simplex.FileTransfer.Description
       Simplex.FileTransfer.Protocol
       Simplex.FileTransfer.Server
+      Simplex.FileTransfer.Server.Control
       Simplex.FileTransfer.Server.Env
       Simplex.FileTransfer.Server.Main
       Simplex.FileTransfer.Server.Stats
@@ -98,10 +99,16 @@ library
       Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230722_indexes
       Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230814_indexes
       Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230829_crypto_files
-      Simplex.Messaging.Agent.TAsyncs
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20231222_command_created_at
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20231225_failed_work_items
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240121_message_delivery_indexes
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240124_file_redirect
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240223_connections_wait_delivery
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240225_ratchet_kem
       Simplex.Messaging.Agent.TRcvQueues
       Simplex.Messaging.Client
       Simplex.Messaging.Client.Agent
+      Simplex.Messaging.Compression
       Simplex.Messaging.Crypto
       Simplex.Messaging.Crypto.File
       Simplex.Messaging.Crypto.Lazy
@@ -139,6 +146,7 @@ library
       Simplex.Messaging.Server.QueueStore.STM
       Simplex.Messaging.Server.Stats
       Simplex.Messaging.Server.StoreLog
+      Simplex.Messaging.ServiceScheme
       Simplex.Messaging.TMap
       Simplex.Messaging.Transport
       Simplex.Messaging.Transport.Buffer
@@ -153,6 +161,7 @@ library
       Simplex.Messaging.Transport.WebSockets
       Simplex.Messaging.Util
       Simplex.Messaging.Version
+      Simplex.Messaging.Version.Internal
       Simplex.RemoteControl.Client
       Simplex.RemoteControl.Discovery
       Simplex.RemoteControl.Discovery.Multicast
@@ -212,8 +221,7 @@ library
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , temporary ==1.3.*
-    , time ==1.9.*
-    , time-compat ==1.9.*
+    , time ==1.12.*
     , time-manager ==0.0.*
     , tls >=1.7.0 && <1.8
     , transformers ==0.6.*
@@ -221,6 +229,7 @@ library
     , unliftio-core ==0.2.*
     , websockets ==0.12.*
     , yaml ==0.11.*
+    , zstd ==0.1.3.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
@@ -285,8 +294,7 @@ executable ntf-server
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , temporary ==1.3.*
-    , time ==1.9.*
-    , time-compat ==1.9.*
+    , time ==1.12.*
     , time-manager ==0.0.*
     , tls >=1.7.0 && <1.8
     , transformers ==0.6.*
@@ -294,6 +302,7 @@ executable ntf-server
     , unliftio-core ==0.2.*
     , websockets ==0.12.*
     , yaml ==0.11.*
+    , zstd ==0.1.3.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
@@ -358,8 +367,7 @@ executable smp-agent
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , temporary ==1.3.*
-    , time ==1.9.*
-    , time-compat ==1.9.*
+    , time ==1.12.*
     , time-manager ==0.0.*
     , tls >=1.7.0 && <1.8
     , transformers ==0.6.*
@@ -367,6 +375,7 @@ executable smp-agent
     , unliftio-core ==0.2.*
     , websockets ==0.12.*
     , yaml ==0.11.*
+    , zstd ==0.1.3.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
@@ -431,8 +440,7 @@ executable smp-server
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , temporary ==1.3.*
-    , time ==1.9.*
-    , time-compat ==1.9.*
+    , time ==1.12.*
     , time-manager ==0.0.*
     , tls >=1.7.0 && <1.8
     , transformers ==0.6.*
@@ -440,6 +448,7 @@ executable smp-server
     , unliftio-core ==0.2.*
     , websockets ==0.12.*
     , yaml ==0.11.*
+    , zstd ==0.1.3.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
@@ -504,8 +513,7 @@ executable xftp
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , temporary ==1.3.*
-    , time ==1.9.*
-    , time-compat ==1.9.*
+    , time ==1.12.*
     , time-manager ==0.0.*
     , tls >=1.7.0 && <1.8
     , transformers ==0.6.*
@@ -513,6 +521,7 @@ executable xftp
     , unliftio-core ==0.2.*
     , websockets ==0.12.*
     , yaml ==0.11.*
+    , zstd ==0.1.3.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
@@ -577,8 +586,7 @@ executable xftp-server
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , temporary ==1.3.*
-    , time ==1.9.*
-    , time-compat ==1.9.*
+    , time ==1.12.*
     , time-manager ==0.0.*
     , tls >=1.7.0 && <1.8
     , transformers ==0.6.*
@@ -586,6 +594,7 @@ executable xftp-server
     , unliftio-core ==0.2.*
     , websockets ==0.12.*
     , yaml ==0.11.*
+    , zstd ==0.1.3.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
@@ -607,6 +616,7 @@ test-suite simplexmq-test
       AgentTests
       AgentTests.ConnectionRequestTests
       AgentTests.DoubleRatchetTests
+      AgentTests.EqInstances
       AgentTests.FunctionalAPITests
       AgentTests.MigrationTests
       AgentTests.NotificationTests
@@ -619,6 +629,7 @@ test-suite simplexmq-test
       CoreTests.EncodingTests
       CoreTests.ProtocolErrorTests
       CoreTests.RetryIntervalTests
+      CoreTests.TRcvQueuesTests
       CoreTests.UtilTests
       CoreTests.VersionRangeTests
       FileDescriptionTests
@@ -628,6 +639,7 @@ test-suite simplexmq-test
       ServerTests
       SMPAgentClient
       SMPClient
+      Util
       XFTPAgent
       XFTPCLI
       XFTPClient
@@ -687,8 +699,7 @@ test-suite simplexmq-test
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , temporary ==1.3.*
-    , time ==1.9.*
-    , time-compat ==1.9.*
+    , time ==1.12.*
     , time-manager ==0.0.*
     , timeit ==2.0.*
     , tls >=1.7.0 && <1.8
@@ -697,6 +708,7 @@ test-suite simplexmq-test
     , unliftio-core ==0.2.*
     , websockets ==0.12.*
     , yaml ==0.11.*
+    , zstd ==0.1.3.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON

src/Simplex/FileTransfer/Agent.hs

@@ -7,7 +7,6 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TupleSections #-}
 {-# LANGUAGE TypeApplications #-}
 {-# OPTIONS_GHC -fno-warn-ambiguous-fields #-}
 
@@ -18,10 +17,14 @@ module Simplex.FileTransfer.Agent
     -- Receiving files
     xftpReceiveFile',
     xftpDeleteRcvFile',
+    xftpDeleteRcvFiles',
     -- Sending files
     xftpSendFile',
+    xftpSendDescription',
     deleteSndFileInternal,
+    deleteSndFilesInternal,
     deleteSndFileRemote,
+    deleteSndFilesRemote,
   )
 where
 
@@ -29,13 +32,18 @@ import Control.Logger.Simple (logError)
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.Reader
+import Data.Bifunctor (first)
 import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy.Char8 as LB
+import Data.Composition ((.:))
+import Data.Either (rights)
 import Data.Int (Int64)
-import Data.List (foldl', sortOn)
+import Data.List (foldl', partition, sortOn)
 import qualified Data.List.NonEmpty as L
 import Data.Map (Map)
 import qualified Data.Map.Strict as M
+import Data.Maybe (mapMaybe)
+import qualified Data.Set as S
 import Data.Text (Text)
 import Data.Time.Clock (getCurrentTime)
 import Data.Time.Format (defaultTimeLocale, formatTime)
@@ -45,6 +53,7 @@ import Simplex.FileTransfer.Crypto
 import Simplex.FileTransfer.Description
 import Simplex.FileTransfer.Protocol (FileParty (..), SFileParty (..))
 import Simplex.FileTransfer.Transport (XFTPRcvChunkSpec (..))
+import qualified Simplex.FileTransfer.Transport as XFTP
 import Simplex.FileTransfer.Types
 import Simplex.FileTransfer.Util (removePath, uniqueCombine)
 import Simplex.Messaging.Agent.Client
@@ -52,15 +61,15 @@ import Simplex.Messaging.Agent.Env.SQLite
 import Simplex.Messaging.Agent.Protocol
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Agent.Store.SQLite
+import qualified Simplex.Messaging.Agent.Store.SQLite.DB as DB
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.File (CryptoFile (..), CryptoFileArgs)
 import qualified Simplex.Messaging.Crypto.File as CF
 import qualified Simplex.Messaging.Crypto.Lazy as LC
 import Simplex.Messaging.Encoding
+import Simplex.Messaging.Encoding.String (strDecode, strEncode)
 import Simplex.Messaging.Protocol (EntityId, XFTPServer)
-import Simplex.Messaging.TMap (TMap)
-import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Util (liftError, tshow, unlessM, whenM)
+import Simplex.Messaging.Util (catchAll_, liftError, tshow, unlessM, whenM)
 import System.FilePath (takeFileName, (</>))
 import UnliftIO
 import UnliftIO.Directory
@@ -69,40 +78,37 @@ startXFTPWorkers :: AgentMonad m => AgentClient -> Maybe FilePath -> m ()
 startXFTPWorkers c workDir = do
   wd <- asks $ xftpWorkDir . xftpAgent
   atomically $ writeTVar wd workDir
-  startRcvFiles
-  startSndFiles
-  startDelFiles
+  cfg <- asks config
+  startRcvFiles cfg
+  startSndFiles cfg
+  startDelFiles cfg
   where
-    startRcvFiles = do
-      rcvFilesTTL <- asks $ rcvFilesTTL . config
+    startRcvFiles AgentConfig {rcvFilesTTL} = do
       pendingRcvServers <- withStore' c (`getPendingRcvFilesServers` rcvFilesTTL)
-      forM_ pendingRcvServers $ \s -> addXFTPRcvWorker c (Just s)
+      forM_ pendingRcvServers $ \s -> resumeXFTPRcvWork c (Just s)
       -- start local worker for files pending decryption,
       -- no need to make an extra query for the check
       -- as the worker will check the store anyway
-      addXFTPRcvWorker c Nothing
-    startSndFiles = do
-      sndFilesTTL <- asks $ sndFilesTTL . config
+      resumeXFTPRcvWork c Nothing
+    startSndFiles AgentConfig {sndFilesTTL} = do
       -- start worker for files pending encryption/creation
-      addXFTPSndWorker c Nothing
+      resumeXFTPSndWork c Nothing
       pendingSndServers <- withStore' c (`getPendingSndFilesServers` sndFilesTTL)
-      forM_ pendingSndServers $ \s -> addXFTPSndWorker c (Just s)
-    startDelFiles = do
-      rcvFilesTTL <- asks $ rcvFilesTTL . config
+      forM_ pendingSndServers $ \s -> resumeXFTPSndWork c (Just s)
+    startDelFiles AgentConfig {rcvFilesTTL} = do
       pendingDelServers <- withStore' c (`getPendingDelFilesServers` rcvFilesTTL)
-      forM_ pendingDelServers $ addXFTPDelWorker c
+      forM_ pendingDelServers $ resumeXFTPDelWork c
 
 closeXFTPAgent :: MonadUnliftIO m => XFTPAgent -> m ()
-closeXFTPAgent XFTPAgent {xftpRcvWorkers, xftpSndWorkers} = do
-  stopWorkers xftpRcvWorkers
-  stopWorkers xftpSndWorkers
+closeXFTPAgent a = do
+  stopWorkers $ xftpRcvWorkers a
+  stopWorkers $ xftpSndWorkers a
+  stopWorkers $ xftpDelWorkers a
   where
-    stopWorkers wsSel = do
-      ws <- atomically $ stateTVar wsSel (,M.empty)
-      mapM_ (uninterruptibleCancel . snd) ws
+    stopWorkers workers = atomically (swapTVar workers M.empty) >>= mapM_ (liftIO . cancelWorker)
 
 xftpReceiveFile' :: AgentMonad m => AgentClient -> UserId -> ValidFileDescription 'FRecipient -> Maybe CryptoFileArgs -> m RcvFileId
-xftpReceiveFile' c userId (ValidFileDescription fd@FileDescription {chunks}) cfArgs = do
+xftpReceiveFile' c userId (ValidFileDescription fd@FileDescription {chunks, redirect}) cfArgs = do
   g <- asks random
   prefixPath <- getPrefixPath "rcv.xftp"
   createDirectory prefixPath
@@ -112,14 +118,25 @@ xftpReceiveFile' c userId (ValidFileDescription fd@FileDescription {chunks}) cfA
   createDirectory =<< toFSFilePath relTmpPath
   createEmptyFile =<< toFSFilePath relSavePath
   let saveFile = CryptoFile relSavePath cfArgs
-  fId <- withStore c $ \db -> createRcvFile db g userId fd relPrefixPath relTmpPath saveFile
-  forM_ chunks downloadChunk
+  fId <- case redirect of
+    Nothing -> withStore c $ \db -> createRcvFile db g userId fd relPrefixPath relTmpPath saveFile
+    Just _ -> do
+      -- prepare description paths
+      let relTmpPathRedirect = relPrefixPath </> "xftp.redirect-encrypted"
+          relSavePathRedirect = relPrefixPath </> "xftp.redirect-decrypted"
+      createDirectory =<< toFSFilePath relTmpPathRedirect
+      createEmptyFile =<< toFSFilePath relSavePathRedirect
+      cfArgsRedirect <- atomically $ CF.randomArgs g
+      let saveFileRedirect = CryptoFile relSavePathRedirect $ Just cfArgsRedirect
+      -- create download tasks
+      withStore c $ \db -> createRcvFileRedirect db g userId fd relPrefixPath relTmpPathRedirect saveFileRedirect relTmpPath saveFile
+  forM_ chunks (downloadChunk c)
   pure fId
-  where
-    downloadChunk :: AgentMonad m => FileChunk -> m ()
-    downloadChunk FileChunk {replicas = (FileChunkReplica {server} : _)} = do
-      addXFTPRcvWorker c (Just server)
-    downloadChunk _ = throwError $ INTERNAL "no replicas"
+
+downloadChunk :: AgentMonad m => AgentClient -> FileChunk -> m ()
+downloadChunk c FileChunk {replicas = (FileChunkReplica {server} : _)} = do
+  void $ getXFTPRcvWorker True c (Just server)
+downloadChunk _ _ = throwError $ INTERNAL "no replicas"
 
 getPrefixPath :: AgentMonad m => String -> m FilePath
 getPrefixPath suffix = do
@@ -134,55 +151,35 @@ toFSFilePath f = (</> f) <$> getXFTPWorkPath
 createEmptyFile :: AgentMonad m => FilePath -> m ()
 createEmptyFile fPath = liftIO $ B.writeFile fPath ""
 
-addXFTPRcvWorker :: AgentMonad m => AgentClient -> Maybe XFTPServer -> m ()
-addXFTPRcvWorker c = addWorker c xftpRcvWorkers runXFTPRcvWorker runXFTPRcvLocalWorker
+resumeXFTPRcvWork :: AgentMonad' m => AgentClient -> Maybe XFTPServer -> m ()
+resumeXFTPRcvWork = void .: getXFTPRcvWorker False
 
-addWorker ::
-  AgentMonad m =>
-  AgentClient ->
-  (XFTPAgent -> TMap (Maybe XFTPServer) (TMVar (), Async ())) ->
-  (AgentClient -> XFTPServer -> TMVar () -> m ()) ->
-  (AgentClient -> TMVar () -> m ()) ->
-  Maybe XFTPServer ->
-  m ()
-addWorker c wsSel runWorker runWorkerNoSrv srv_ = do
-  ws <- asks $ wsSel . xftpAgent
-  atomically (TM.lookup srv_ ws) >>= \case
-    Nothing -> do
-      doWork <- newTMVarIO ()
-      let runWorker' = case srv_ of
-            Just srv -> runWorker c srv doWork
-            Nothing -> runWorkerNoSrv c doWork
-      worker <- async $ runWorker' `agentFinally` atomically (TM.delete srv_ ws)
-      atomically $ TM.insert srv_ (doWork, worker) ws
-    Just (doWork, _) ->
-      void . atomically $ tryPutTMVar doWork ()
+getXFTPRcvWorker :: AgentMonad' m => Bool -> AgentClient -> Maybe XFTPServer -> m Worker
+getXFTPRcvWorker hasWork c server = do
+  ws <- asks $ xftpRcvWorkers . xftpAgent
+  getAgentWorker "xftp_rcv" hasWork c server ws $
+    maybe (runXFTPRcvLocalWorker c) (runXFTPRcvWorker c) server
 
-runXFTPRcvWorker :: forall m. AgentMonad m => AgentClient -> XFTPServer -> TMVar () -> m ()
-runXFTPRcvWorker c srv doWork = do
+runXFTPRcvWorker :: forall m. AgentMonad m => AgentClient -> XFTPServer -> Worker -> m ()
+runXFTPRcvWorker c srv Worker {doWork} = do
+  cfg <- asks config
   forever $ do
-    void . atomically $ readTMVar doWork
+    waitForWork doWork
     atomically $ assertAgentForeground c
-    runXFTPOperation
+    runXFTPOperation cfg
   where
-    noWorkToDo = void . atomically $ tryTakeTMVar doWork
-    runXFTPOperation :: m ()
-    runXFTPOperation = do
-      rcvFilesTTL <- asks (rcvFilesTTL . config)
-      nextChunk <- withStore' c $ \db -> getNextRcvChunkToDownload db srv rcvFilesTTL
-      case nextChunk of
-        Nothing -> noWorkToDo
-        Just RcvFileChunk {rcvFileId, rcvFileEntityId, fileTmpPath, replicas = []} -> rcvWorkerInternalError c rcvFileId rcvFileEntityId (Just fileTmpPath) "chunk has no replicas"
-        Just fc@RcvFileChunk {userId, rcvFileId, rcvFileEntityId, digest, fileTmpPath, replicas = replica@RcvFileChunkReplica {rcvChunkReplicaId, server, delay} : _} -> do
-          ri <- asks $ reconnectInterval . config
+    runXFTPOperation :: AgentConfig -> m ()
+    runXFTPOperation AgentConfig {rcvFilesTTL, reconnectInterval = ri, xftpNotifyErrsOnRetry = notifyOnRetry, xftpConsecutiveRetries} =
+      withWork c doWork (\db -> getNextRcvChunkToDownload db srv rcvFilesTTL) $ \case
+        RcvFileChunk {rcvFileId, rcvFileEntityId, fileTmpPath, replicas = []} -> rcvWorkerInternalError c rcvFileId rcvFileEntityId (Just fileTmpPath) "chunk has no replicas"
+        fc@RcvFileChunk {userId, rcvFileId, rcvFileEntityId, digest, fileTmpPath, replicas = replica@RcvFileChunkReplica {rcvChunkReplicaId, server, delay} : _} -> do
           let ri' = maybe ri (\d -> ri {initialInterval = d, increaseAfter = 0}) delay
-          withRetryInterval ri' $ \delay' loop ->
+          withRetryIntervalLimit xftpConsecutiveRetries ri' $ \delay' loop ->
             downloadFileChunk fc replica
               `catchAgentError` \e -> retryOnError "XFTP rcv worker" (retryLoop loop e delay') (retryDone e) e
           where
             retryLoop loop e replicaDelay = do
               flip catchAgentError (\_ -> pure ()) $ do
-                notifyOnRetry <- asks (xftpNotifyErrsOnRetry . config)
                 when notifyOnRetry $ notify c rcvFileEntityId $ RFERR e
                 closeXFTPServerClient c userId server digest
                 withStore' c $ \db -> updateRcvChunkReplicaDelay db rcvChunkReplicaId replicaDelay
@@ -197,15 +194,19 @@ runXFTPRcvWorker c srv doWork = do
           relChunkPath = fileTmpPath </> takeFileName chunkPath
       agentXFTPDownloadChunk c userId digest replica chunkSpec
       atomically $ waitUntilForeground c
-      (complete, progress) <- withStore c $ \db -> runExceptT $ do
+      (entityId, complete, progress) <- withStore c $ \db -> runExceptT $ do
         liftIO $ updateRcvFileChunkReceived db (rcvChunkReplicaId replica) rcvChunkId relChunkPath
-        RcvFile {size = FileSize total, chunks} <- ExceptT $ getRcvFile db rcvFileId
+        RcvFile {size = FileSize currentSize, chunks, redirect} <- ExceptT $ getRcvFile db rcvFileId
         let rcvd = receivedSize chunks
             complete = all chunkReceived chunks
+            (entityId, total) = case redirect of
+              Nothing -> (rcvFileEntityId, currentSize)
+              Just RcvFileRedirect {redirectFileInfo = RedirectFileInfo {size = FileSize finalSize}, redirectEntityId} -> (redirectEntityId, finalSize)
         liftIO . when complete $ updateRcvFileStatus db rcvFileId RFSReceived
-        pure (complete, RFPROG rcvd total)
-      notify c rcvFileEntityId progress
-      when complete $ addXFTPRcvWorker c Nothing
+        pure (entityId, complete, RFPROG rcvd total)
+      notify c entityId progress
+      when complete . void $
+        getXFTPRcvWorker True c Nothing
       where
         receivedSize :: [RcvFileChunk] -> Int64
         receivedSize = foldl' (\sz ch -> sz + receivedChunkSize ch) 0
@@ -214,6 +215,12 @@ runXFTPRcvWorker c srv doWork = do
           | otherwise = 0
         chunkReceived RcvFileChunk {replicas} = any received replicas
 
+-- The first call of action has n == 0, maxN is max number of retries
+withRetryIntervalLimit :: forall m. MonadIO m => Int -> RetryInterval -> (Int64 -> m () -> m ()) -> m ()
+withRetryIntervalLimit maxN ri action =
+  withRetryIntervalCount ri $ \n delay loop ->
+    when (n < maxN) $ action delay loop
+
 retryOnError :: AgentMonad m => Text -> m a -> m a -> AgentErrorType -> m a
 retryOnError name loop done e = do
   logError $ name <> " error: " <> tshow e
@@ -227,24 +234,21 @@ rcvWorkerInternalError c rcvFileId rcvFileEntityId tmpPath internalErrStr = do
   withStore' c $ \db -> updateRcvFileError db rcvFileId internalErrStr
   notify c rcvFileEntityId $ RFERR $ INTERNAL internalErrStr
 
-runXFTPRcvLocalWorker :: forall m. AgentMonad m => AgentClient -> TMVar () -> m ()
-runXFTPRcvLocalWorker c doWork = do
+runXFTPRcvLocalWorker :: forall m. AgentMonad m => AgentClient -> Worker -> m ()
+runXFTPRcvLocalWorker c Worker {doWork} = do
+  cfg <- asks config
   forever $ do
-    void . atomically $ readTMVar doWork
+    waitForWork doWork
     atomically $ assertAgentForeground c
-    runXFTPOperation
+    runXFTPOperation cfg
   where
-    runXFTPOperation :: m ()
-    runXFTPOperation = do
-      rcvFilesTTL <- asks (rcvFilesTTL . config)
-      nextFile <- withStore' c (`getNextRcvFileToDecrypt` rcvFilesTTL)
-      case nextFile of
-        Nothing -> noWorkToDo
-        Just f@RcvFile {rcvFileId, rcvFileEntityId, tmpPath} ->
+    runXFTPOperation :: AgentConfig -> m ()
+    runXFTPOperation AgentConfig {rcvFilesTTL} =
+      withWork c doWork (`getNextRcvFileToDecrypt` rcvFilesTTL) $
+        \f@RcvFile {rcvFileId, rcvFileEntityId, tmpPath} ->
           decryptFile f `catchAgentError` (rcvWorkerInternalError c rcvFileId rcvFileEntityId tmpPath . show)
-    noWorkToDo = void . atomically $ tryTakeTMVar doWork
     decryptFile :: RcvFile -> m ()
-    decryptFile RcvFile {rcvFileId, rcvFileEntityId, key, nonce, tmpPath, saveFile, status, chunks} = do
+    decryptFile RcvFile {rcvFileId, rcvFileEntityId, size, digest, key, nonce, tmpPath, saveFile, status, chunks, redirect} = do
       let CryptoFile savePath cfArgs = saveFile
       fsSavePath <- toFSFilePath savePath
       when (status == RFSDecrypting) $
@@ -252,12 +256,33 @@ runXFTPRcvLocalWorker c doWork = do
       withStore' c $ \db -> updateRcvFileStatus db rcvFileId RFSDecrypting
       chunkPaths <- getChunkPaths chunks
       encSize <- liftIO $ foldM (\s path -> (s +) . fromIntegral <$> getFileSize path) 0 chunkPaths
+      when (FileSize encSize /= size) $ throwError $ XFTP XFTP.SIZE
+      encDigest <- liftIO $ LC.sha512Hash <$> readChunks chunkPaths
+      when (FileDigest encDigest /= digest) $ throwError $ XFTP XFTP.DIGEST
       let destFile = CryptoFile fsSavePath cfArgs
       void $ liftError (INTERNAL . show) $ decryptChunks encSize chunkPaths key nonce $ \_ -> pure destFile
-      notify c rcvFileEntityId $ RFDONE fsSavePath
-      forM_ tmpPath (removePath <=< toFSFilePath)
-      atomically $ waitUntilForeground c
-      withStore' c (`updateRcvFileComplete` rcvFileId)
+      case redirect of
+        Nothing -> do
+          notify c rcvFileEntityId $ RFDONE fsSavePath
+          forM_ tmpPath (removePath <=< toFSFilePath)
+          atomically $ waitUntilForeground c
+          withStore' c (`updateRcvFileComplete` rcvFileId)
+        Just RcvFileRedirect {redirectFileInfo, redirectDbId} -> do
+          let RedirectFileInfo {size = redirectSize, digest = redirectDigest} = redirectFileInfo
+          forM_ tmpPath (removePath <=< toFSFilePath)
+          atomically $ waitUntilForeground c
+          withStore' c (`updateRcvFileComplete` rcvFileId)
+          -- proceed with redirect
+          yaml <- liftError (INTERNAL . show) (CF.readFile $ CryptoFile fsSavePath cfArgs) `finally` (toFSFilePath fsSavePath >>= removePath)
+          next@FileDescription {chunks = nextChunks} <- case strDecode (LB.toStrict yaml) of
+            Left _ -> throwError . XFTP $ XFTP.REDIRECT "decode error"
+            Right (ValidFileDescription fd@FileDescription {size = dstSize, digest = dstDigest})
+              | dstSize /= redirectSize -> throwError . XFTP $ XFTP.REDIRECT "size mismatch"
+              | dstDigest /= redirectDigest -> throwError . XFTP $ XFTP.REDIRECT "digest mismatch"
+              | otherwise -> pure fd
+          -- register and download chunks from the actual file
+          withStore c $ \db -> updateRcvFileRedirect db redirectDbId next
+          forM_ nextChunks (downloadChunk c)
       where
         getChunkPaths :: [RcvFileChunk] -> m [FilePath]
         getChunkPaths [] = pure []
@@ -269,13 +294,22 @@ runXFTPRcvLocalWorker c doWork = do
           throwError $ INTERNAL "no chunk path"
 
 xftpDeleteRcvFile' :: AgentMonad m => AgentClient -> RcvFileId -> m ()
-xftpDeleteRcvFile' c rcvFileEntityId = do
-  RcvFile {rcvFileId, prefixPath, status} <- withStore c $ \db -> getRcvFileByEntityId db rcvFileEntityId
-  if status == RFSComplete || status == RFSError
-    then do
-      removePath prefixPath
-      withStore' c (`deleteRcvFile'` rcvFileId)
-    else withStore' c (`updateRcvFileDeleted` rcvFileId)
+xftpDeleteRcvFile' c rcvFileEntityId = xftpDeleteRcvFiles' c [rcvFileEntityId]
+
+xftpDeleteRcvFiles' :: forall m. AgentMonad m => AgentClient -> [RcvFileId] -> m ()
+xftpDeleteRcvFiles' c rcvFileEntityIds = do
+  rcvFiles <- rights <$> withStoreBatch c (\db -> map (fmap (first storeError) . getRcvFileByEntityId db) rcvFileEntityIds)
+  redirects <- rights <$> batchFiles getRcvFileRedirects rcvFiles
+  let (toDelete, toMarkDeleted) = partition fileComplete $ concat redirects <> rcvFiles
+  void $ batchFiles deleteRcvFile' toDelete
+  void $ batchFiles updateRcvFileDeleted toMarkDeleted
+  workPath <- getXFTPWorkPath
+  liftIO . forM_ toDelete $ \RcvFile {prefixPath} ->
+    (removePath . (workPath </>)) prefixPath `catchAll_` pure ()
+  where
+    fileComplete RcvFile {status} = status == RFSComplete || status == RFSError
+    batchFiles :: (DB.Connection -> DBRcvFileId -> IO a) -> [RcvFile] -> m [Either AgentErrorType a]
+    batchFiles f rcvFiles = withStoreBatch' c $ \db -> map (\RcvFile {rcvFileId} -> f db rcvFileId) rcvFiles
 
 notify :: forall m e. (MonadUnliftIO m, AEntityI e) => AgentClient -> EntityId -> ACommand 'Agent e -> m ()
 notify c entId cmd = atomically $ writeTBQueue (subQ c) ("", entId, APC (sAEntity @e) cmd)
@@ -286,36 +320,55 @@ xftpSendFile' c userId file numRecipients = do
   prefixPath <- getPrefixPath "snd.xftp"
   createDirectory prefixPath
   let relPrefixPath = takeFileName prefixPath
-  key <- liftIO C.randomSbKey
-  nonce <- liftIO C.randomCbNonce
+  key <- atomically $ C.randomSbKey g
+  nonce <- atomically $ C.randomCbNonce g
   -- saving absolute filePath will not allow to restore file encryption after app update, but it's a short window
-  fId <- withStore c $ \db -> createSndFile db g userId file numRecipients relPrefixPath key nonce
-  addXFTPSndWorker c Nothing
+  fId <- withStore c $ \db -> createSndFile db g userId file numRecipients relPrefixPath key nonce Nothing
+  void $ getXFTPSndWorker True c Nothing
   pure fId
 
-addXFTPSndWorker :: AgentMonad m => AgentClient -> Maybe XFTPServer -> m ()
-addXFTPSndWorker c = addWorker c xftpSndWorkers runXFTPSndWorker runXFTPSndPrepareWorker
+xftpSendDescription' :: forall m. AgentMonad m => AgentClient -> UserId -> ValidFileDescription 'FRecipient -> Int -> m SndFileId
+xftpSendDescription' c userId (ValidFileDescription fdDirect@FileDescription {size, digest}) numRecipients = do
+  g <- asks random
+  prefixPath <- getPrefixPath "snd.xftp"
+  createDirectory prefixPath
+  let relPrefixPath = takeFileName prefixPath
+  let directYaml = prefixPath </> "direct.yaml"
+  cfArgs <- atomically $ CF.randomArgs g
+  let file = CryptoFile directYaml (Just cfArgs)
+  liftError (INTERNAL . show) $ CF.writeFile file (LB.fromStrict $ strEncode fdDirect)
+  key <- atomically $ C.randomSbKey g
+  nonce <- atomically $ C.randomCbNonce g
+  fId <- withStore c $ \db -> createSndFile db g userId file numRecipients relPrefixPath key nonce $ Just RedirectFileInfo {size, digest}
+  void $ getXFTPSndWorker True c Nothing
+  pure fId
 
-runXFTPSndPrepareWorker :: forall m. AgentMonad m => AgentClient -> TMVar () -> m ()
-runXFTPSndPrepareWorker c doWork = do
+resumeXFTPSndWork :: AgentMonad' m => AgentClient -> Maybe XFTPServer -> m ()
+resumeXFTPSndWork = void .: getXFTPSndWorker False
+
+getXFTPSndWorker :: AgentMonad' m => Bool -> AgentClient -> Maybe XFTPServer -> m Worker
+getXFTPSndWorker hasWork c server = do
+  ws <- asks $ xftpSndWorkers . xftpAgent
+  getAgentWorker "xftp_snd" hasWork c server ws $
+    maybe (runXFTPSndPrepareWorker c) (runXFTPSndWorker c) server
+
+runXFTPSndPrepareWorker :: forall m. AgentMonad m => AgentClient -> Worker -> m ()
+runXFTPSndPrepareWorker c Worker {doWork} = do
+  cfg <- asks config
   forever $ do
-    void . atomically $ readTMVar doWork
+    waitForWork doWork
     atomically $ assertAgentForeground c
-    runXFTPOperation
+    runXFTPOperation cfg
   where
-    runXFTPOperation :: m ()
-    runXFTPOperation = do
-      sndFilesTTL <- asks (sndFilesTTL . config)
-      nextFile <- withStore' c (`getNextSndFileToPrepare` sndFilesTTL)
-      case nextFile of
-        Nothing -> noWorkToDo
-        Just f@SndFile {sndFileId, sndFileEntityId, prefixPath} ->
-          prepareFile f `catchAgentError` (sndWorkerInternalError c sndFileId sndFileEntityId prefixPath . show)
-    noWorkToDo = void . atomically $ tryTakeTMVar doWork
-    prepareFile :: SndFile -> m ()
-    prepareFile SndFile {prefixPath = Nothing} =
+    runXFTPOperation :: AgentConfig -> m ()
+    runXFTPOperation cfg@AgentConfig {sndFilesTTL} =
+      withWork c doWork (`getNextSndFileToPrepare` sndFilesTTL) $
+        \f@SndFile {sndFileId, sndFileEntityId, prefixPath} ->
+          prepareFile cfg f `catchAgentError` (sndWorkerInternalError c sndFileId sndFileEntityId prefixPath . show)
+    prepareFile :: AgentConfig -> SndFile -> m ()
+    prepareFile _ SndFile {prefixPath = Nothing} =
       throwError $ INTERNAL "no prefix path"
-    prepareFile sndFile@SndFile {sndFileId, userId, prefixPath = Just ppath, status} = do
+    prepareFile cfg sndFile@SndFile {sndFileId, userId, prefixPath = Just ppath, status} = do
       SndFile {numRecipients, chunks} <-
         if status /= SFSEncrypted -- status is SFSNew or SFSEncrypting
           then do
@@ -328,18 +381,19 @@ runXFTPSndPrepareWorker c doWork = do
               updateSndFileEncrypted db sndFileId digest chunkSpecsDigests
               getSndFile db sndFileId
           else pure sndFile
-      maxRecipients <- asks (xftpMaxRecipientsPerRequest . config)
       let numRecipients' = min numRecipients maxRecipients
       -- concurrently?
+      -- separate worker to create chunks? record retries and delay on snd_file_chunks?
       forM_ (filter (not . chunkCreated) chunks) $ createChunk numRecipients'
       withStore' c $ \db -> updateSndFileStatus db sndFileId SFSUploading
       where
+        AgentConfig {xftpMaxRecipientsPerRequest = maxRecipients, messageRetryInterval = ri} = cfg
         encryptFileForUpload :: SndFile -> FilePath -> m (FileDigest, [(XFTPChunkSpec, FileDigest)])
         encryptFileForUpload SndFile {key, nonce, srcFile} fsEncPath = do
           let CryptoFile {filePath} = srcFile
               fileName = takeFileName filePath
           fileSize <- liftIO $ fromInteger <$> CF.getFileContentsSize srcFile
-          when (fileSize > maxFileSize) $ throwError $ INTERNAL "max file size exceeded"
+          when (fileSize > maxFileSizeHard) $ throwError $ INTERNAL "max file size exceeded"
           let fileHdr = smpEncode FileHeader {fileName, fileExtra = Nothing}
               fileSize' = fromIntegral (B.length fileHdr) + fileSize
               chunkSizes = prepareChunkSizes $ fileSize' + fileSizeLen + authTagSize
@@ -358,10 +412,9 @@ runXFTPSndPrepareWorker c doWork = do
           atomically $ assertAgentForeground c
           (replica, ProtoServerWithAuth srv _) <- tryCreate
           withStore' c $ \db -> createSndFileReplica db ch replica
-          addXFTPSndWorker c $ Just srv
+          void $ getXFTPSndWorker True c (Just srv)
           where
             tryCreate = do
-              ri <- asks $ messageRetryInterval . config
               usedSrvs <- newTVarIO ([] :: [XFTPServer])
               withRetryInterval (riFast ri) $ \_ loop ->
                 createWithNextSrv usedSrvs
@@ -381,39 +434,34 @@ sndWorkerInternalError c sndFileId sndFileEntityId prefixPath internalErrStr = d
   withStore' c $ \db -> updateSndFileError db sndFileId internalErrStr
   notify c sndFileEntityId $ SFERR $ INTERNAL internalErrStr
 
-runXFTPSndWorker :: forall m. AgentMonad m => AgentClient -> XFTPServer -> TMVar () -> m ()
-runXFTPSndWorker c srv doWork = do
+runXFTPSndWorker :: forall m. AgentMonad m => AgentClient -> XFTPServer -> Worker -> m ()
+runXFTPSndWorker c srv Worker {doWork} = do
+  cfg <- asks config
   forever $ do
-    void . atomically $ readTMVar doWork
+    waitForWork doWork
     atomically $ assertAgentForeground c
-    runXFTPOperation
+    runXFTPOperation cfg
   where
-    noWorkToDo = void . atomically $ tryTakeTMVar doWork
-    runXFTPOperation :: m ()
-    runXFTPOperation = do
-      sndFilesTTL <- asks (sndFilesTTL . config)
-      nextChunk <- withStore' c $ \db -> getNextSndChunkToUpload db srv sndFilesTTL
-      case nextChunk of
-        Nothing -> noWorkToDo
-        Just SndFileChunk {sndFileId, sndFileEntityId, filePrefixPath, replicas = []} -> sndWorkerInternalError c sndFileId sndFileEntityId (Just filePrefixPath) "chunk has no replicas"
-        Just fc@SndFileChunk {userId, sndFileId, sndFileEntityId, filePrefixPath, digest, replicas = replica@SndFileChunkReplica {sndChunkReplicaId, server, delay} : _} -> do
-          ri <- asks $ reconnectInterval . config
+    runXFTPOperation :: AgentConfig -> m ()
+    runXFTPOperation cfg@AgentConfig {sndFilesTTL, reconnectInterval = ri, xftpNotifyErrsOnRetry = notifyOnRetry, xftpConsecutiveRetries} = do
+      withWork c doWork (\db -> getNextSndChunkToUpload db srv sndFilesTTL) $ \case
+        SndFileChunk {sndFileId, sndFileEntityId, filePrefixPath, replicas = []} -> sndWorkerInternalError c sndFileId sndFileEntityId (Just filePrefixPath) "chunk has no replicas"
+        fc@SndFileChunk {userId, sndFileId, sndFileEntityId, filePrefixPath, digest, replicas = replica@SndFileChunkReplica {sndChunkReplicaId, server, delay} : _} -> do
           let ri' = maybe ri (\d -> ri {initialInterval = d, increaseAfter = 0}) delay
-          withRetryInterval ri' $ \delay' loop ->
-            uploadFileChunk fc replica
+          withRetryIntervalLimit xftpConsecutiveRetries ri' $ \delay' loop ->
+            uploadFileChunk cfg fc replica
               `catchAgentError` \e -> retryOnError "XFTP snd worker" (retryLoop loop e delay') (retryDone e) e
           where
             retryLoop loop e replicaDelay = do
               flip catchAgentError (\_ -> pure ()) $ do
-                notifyOnRetry <- asks (xftpNotifyErrsOnRetry . config)
                 when notifyOnRetry $ notify c sndFileEntityId $ SFERR e
                 closeXFTPServerClient c userId server digest
                 withStore' c $ \db -> updateSndChunkReplicaDelay db sndChunkReplicaId replicaDelay
               atomically $ assertAgentForeground c
               loop
             retryDone e = sndWorkerInternalError c sndFileId sndFileEntityId (Just filePrefixPath) (show e)
-    uploadFileChunk :: SndFileChunk -> SndFileChunkReplica -> m ()
-    uploadFileChunk sndFileChunk@SndFileChunk {sndFileId, userId, chunkSpec = chunkSpec@XFTPChunkSpec {filePath}, digest = chunkDigest} replica = do
+    uploadFileChunk :: AgentConfig -> SndFileChunk -> SndFileChunkReplica -> m ()
+    uploadFileChunk AgentConfig {xftpMaxRecipientsPerRequest = maxRecipients} sndFileChunk@SndFileChunk {sndFileId, userId, chunkSpec = chunkSpec@XFTPChunkSpec {filePath}, digest = chunkDigest} replica = do
       replica'@SndFileChunkReplica {sndChunkReplicaId} <- addRecipients sndFileChunk replica
       fsFilePath <- toFSFilePath filePath
       unlessM (doesFileExist fsFilePath) $ throwError $ INTERNAL "encrypted file doesn't exist on upload"
@@ -439,7 +487,6 @@ runXFTPSndWorker c srv doWork = do
           | length rcvIdsKeys > numRecipients = throwError $ INTERNAL "too many recipients"
           | length rcvIdsKeys == numRecipients = pure cr
           | otherwise = do
-              maxRecipients <- asks $ xftpMaxRecipientsPerRequest . config
               let numRecipients' = min (numRecipients - length rcvIdsKeys) maxRecipients
               rcvIdsKeys' <- agentXFTPAddRecipients c userId chunkDigest cr numRecipients'
               cr' <- withStore' c $ \db -> addSndChunkReplicaRecipients db cr $ L.toList rcvIdsKeys'
@@ -447,15 +494,15 @@ runXFTPSndWorker c srv doWork = do
         sndFileToDescrs :: SndFile -> m (ValidFileDescription 'FSender, [ValidFileDescription 'FRecipient])
         sndFileToDescrs SndFile {digest = Nothing} = throwError $ INTERNAL "snd file has no digest"
         sndFileToDescrs SndFile {chunks = []} = throwError $ INTERNAL "snd file has no chunks"
-        sndFileToDescrs SndFile {digest = Just digest, key, nonce, chunks = chunks@(fstChunk : _)} = do
+        sndFileToDescrs SndFile {digest = Just digest, key, nonce, chunks = chunks@(fstChunk : _), redirect} = do
           let chunkSize = FileSize $ sndChunkSize fstChunk
               size = FileSize $ sum $ map (fromIntegral . sndChunkSize) chunks
           -- snd description
           sndDescrChunks <- mapM toSndDescrChunk chunks
-          let fdSnd = FileDescription {party = SFSender, size, digest, key, nonce, chunkSize, chunks = sndDescrChunks}
+          let fdSnd = FileDescription {party = SFSender, size, digest, key, nonce, chunkSize, chunks = sndDescrChunks, redirect = Nothing}
           validFdSnd <- either (throwError . INTERNAL) pure $ validateFileDescription fdSnd
           -- rcv descriptions
-          let fdRcv = FileDescription {party = SFRecipient, size, digest, key, nonce, chunkSize, chunks = []}
+          let fdRcv = FileDescription {party = SFRecipient, size, digest, key, nonce, chunkSize, chunks = [], redirect}
               fdRcvs = createRcvFileDescriptions fdRcv chunks
           validFdRcvs <- either (throwError . INTERNAL) pure $ mapM validateFileDescription fdRcvs
           pure (validFdSnd, validFdRcvs)
@@ -511,71 +558,77 @@ runXFTPSndWorker c srv doWork = do
           any (\SndFileChunkReplica {replicaStatus} -> replicaStatus == SFRSUploaded) replicas
 
 deleteSndFileInternal :: AgentMonad m => AgentClient -> SndFileId -> m ()
-deleteSndFileInternal c sndFileEntityId = do
-  SndFile {sndFileId, prefixPath, status} <- withStore c $ \db -> getSndFileByEntityId db sndFileEntityId
-  if status == SFSComplete || status == SFSError
-    then do
-      forM_ prefixPath $ removePath <=< toFSFilePath
-      withStore' c (`deleteSndFile'` sndFileId)
-    else withStore' c (`updateSndFileDeleted` sndFileId)
+deleteSndFileInternal c sndFileEntityId = deleteSndFilesInternal c [sndFileEntityId]
+
+deleteSndFilesInternal :: forall m. AgentMonad m => AgentClient -> [SndFileId] -> m ()
+deleteSndFilesInternal c sndFileEntityIds = do
+  sndFiles <- rights <$> withStoreBatch c (\db -> map (fmap (first storeError) . getSndFileByEntityId db) sndFileEntityIds)
+  let (toDelete, toMarkDeleted) = partition fileComplete sndFiles
+  workPath <- getXFTPWorkPath
+  liftIO . forM_ toDelete $ \SndFile {prefixPath} ->
+    mapM_ (removePath . (workPath </>)) prefixPath `catchAll_` pure ()
+  batchFiles_ deleteSndFile' toDelete
+  batchFiles_ updateSndFileDeleted toMarkDeleted
+  where
+    fileComplete SndFile {status} = status == SFSComplete || status == SFSError
+    batchFiles_ :: (DB.Connection -> DBSndFileId -> IO a) -> [SndFile] -> m ()
+    batchFiles_ f sndFiles = void $ withStoreBatch' c $ \db -> map (\SndFile {sndFileId} -> f db sndFileId) sndFiles
 
 deleteSndFileRemote :: forall m. AgentMonad m => AgentClient -> UserId -> SndFileId -> ValidFileDescription 'FSender -> m ()
-deleteSndFileRemote c userId sndFileEntityId (ValidFileDescription FileDescription {chunks}) = do
-  deleteSndFileInternal c sndFileEntityId `catchAgentError` (notify c sndFileEntityId . SFERR)
-  forM_ chunks $ \ch -> deleteFileChunk ch `catchAgentError` (notify c sndFileEntityId . SFERR)
-  where
-    deleteFileChunk :: FileChunk -> m ()
-    deleteFileChunk FileChunk {digest, replicas = replica@FileChunkReplica {server} : _} = do
-      withStore' c $ \db -> createDeletedSndChunkReplica db userId replica digest
-      addXFTPDelWorker c server
-    deleteFileChunk _ = pure ()
+deleteSndFileRemote c userId sndFileEntityId sfd = deleteSndFilesRemote c userId [(sndFileEntityId, sfd)]
 
-addXFTPDelWorker :: AgentMonad m => AgentClient -> XFTPServer -> m ()
-addXFTPDelWorker c srv = do
+deleteSndFilesRemote :: forall m. AgentMonad m => AgentClient -> UserId -> [(SndFileId, ValidFileDescription 'FSender)] -> m ()
+deleteSndFilesRemote c userId sndFileIdsDescrs = do
+  deleteSndFilesInternal c (map fst sndFileIdsDescrs) `catchAgentError` (notify c "" . SFERR)
+  let rs = concatMap (mapMaybe chunkReplica . fdChunks . snd) sndFileIdsDescrs
+  void $ withStoreBatch' c (\db -> map (uncurry $ createDeletedSndChunkReplica db userId) rs)
+  let servers = S.fromList $ map (\(FileChunkReplica {server}, _) -> server) rs
+  mapM_ (getXFTPDelWorker True c) servers
+  where
+    fdChunks (ValidFileDescription FileDescription {chunks}) = chunks
+    chunkReplica :: FileChunk -> Maybe (FileChunkReplica, FileDigest)
+    chunkReplica = \case
+      FileChunk {digest, replicas = replica : _} -> Just (replica, digest)
+      _ -> Nothing
+
+resumeXFTPDelWork :: AgentMonad' m => AgentClient -> XFTPServer -> m ()
+resumeXFTPDelWork = void .: getXFTPDelWorker False
+
+getXFTPDelWorker :: AgentMonad' m => Bool -> AgentClient -> XFTPServer -> m Worker
+getXFTPDelWorker hasWork c server = do
   ws <- asks $ xftpDelWorkers . xftpAgent
-  atomically (TM.lookup srv ws) >>= \case
-    Nothing -> do
-      doWork <- newTMVarIO ()
-      worker <- async $ runXFTPDelWorker c srv doWork `agentFinally` atomically (TM.delete srv ws)
-      atomically $ TM.insert srv (doWork, worker) ws
-    Just (doWork, _) ->
-      void . atomically $ tryPutTMVar doWork ()
+  getAgentWorker "xftp_del" hasWork c server ws $ runXFTPDelWorker c server
 
-runXFTPDelWorker :: forall m. AgentMonad m => AgentClient -> XFTPServer -> TMVar () -> m ()
-runXFTPDelWorker c srv doWork = do
+runXFTPDelWorker :: forall m. AgentMonad m => AgentClient -> XFTPServer -> Worker -> m ()
+runXFTPDelWorker c srv Worker {doWork} = do
+  cfg <- asks config
   forever $ do
-    void . atomically $ readTMVar doWork
+    waitForWork doWork
     atomically $ assertAgentForeground c
-    runXFTPOperation
+    runXFTPOperation cfg
   where
-    noWorkToDo = void . atomically $ tryTakeTMVar doWork
-    runXFTPOperation :: m ()
-    runXFTPOperation = do
+    runXFTPOperation :: AgentConfig -> m ()
+    runXFTPOperation AgentConfig {rcvFilesTTL, reconnectInterval = ri, xftpNotifyErrsOnRetry = notifyOnRetry, xftpConsecutiveRetries} = do
       -- no point in deleting files older than rcv ttl, as they will be expired on server
-      rcvFilesTTL <- asks (rcvFilesTTL . config)
-      nextReplica <- withStore' c $ \db -> getNextDeletedSndChunkReplica db srv rcvFilesTTL
-      case nextReplica of
-        Nothing -> noWorkToDo
-        Just replica@DeletedSndChunkReplica {deletedSndChunkReplicaId, userId, server, chunkDigest, delay} -> do
-          ri <- asks $ reconnectInterval . config
+      withWork c doWork (\db -> getNextDeletedSndChunkReplica db srv rcvFilesTTL) processDeletedReplica
+      where
+        processDeletedReplica replica@DeletedSndChunkReplica {deletedSndChunkReplicaId, userId, server, chunkDigest, delay} = do
           let ri' = maybe ri (\d -> ri {initialInterval = d, increaseAfter = 0}) delay
-          withRetryInterval ri' $ \delay' loop ->
-            deleteChunkReplica replica
+          withRetryIntervalLimit xftpConsecutiveRetries ri' $ \delay' loop ->
+            deleteChunkReplica
               `catchAgentError` \e -> retryOnError "XFTP del worker" (retryLoop loop e delay') (retryDone e) e
           where
             retryLoop loop e replicaDelay = do
               flip catchAgentError (\_ -> pure ()) $ do
-                notifyOnRetry <- asks (xftpNotifyErrsOnRetry . config)
                 when notifyOnRetry $ notify c "" $ SFERR e
                 closeXFTPServerClient c userId server chunkDigest
                 withStore' c $ \db -> updateDeletedSndChunkReplicaDelay db deletedSndChunkReplicaId replicaDelay
               atomically $ assertAgentForeground c
               loop
             retryDone = delWorkerInternalError c deletedSndChunkReplicaId
-    deleteChunkReplica :: DeletedSndChunkReplica -> m ()
-    deleteChunkReplica replica@DeletedSndChunkReplica {userId, deletedSndChunkReplicaId} = do
-      agentXFTPDeleteChunk c userId replica
-      withStore' c $ \db -> deleteDeletedSndChunkReplica db deletedSndChunkReplicaId
+            deleteChunkReplica = do
+              agentXFTPDeleteChunk c userId replica
+              withStore' c $ \db -> deleteDeletedSndChunkReplica db deletedSndChunkReplicaId
 
 delWorkerInternalError :: AgentMonad m => AgentClient -> Int64 -> AgentErrorType -> m ()
 delWorkerInternalError c deletedSndChunkReplicaId e = do

src/Simplex/FileTransfer/Client.hs

@@ -11,6 +11,7 @@ module Simplex.FileTransfer.Client where
 
 import Control.Monad
 import Control.Monad.Except
+import Crypto.Random (ChaChaDRG)
 import Data.Bifunctor (first)
 import Data.ByteString.Builder (Builder, byteString)
 import Data.ByteString.Char8 (ByteString)
@@ -44,7 +45,7 @@ import Simplex.Messaging.Protocol
     RecipientId,
     SenderId,
   )
-import Simplex.Messaging.Transport (supportedParameters)
+import Simplex.Messaging.Transport (THandleParams (..), supportedParameters)
 import Simplex.Messaging.Transport.Client (TransportClientConfig, TransportHost)
 import Simplex.Messaging.Transport.HTTP2
 import Simplex.Messaging.Transport.HTTP2.Client
@@ -56,6 +57,7 @@ import UnliftIO.Directory
 data XFTPClient = XFTPClient
   { http2Client :: HTTP2Client,
     transportSession :: TransportSession FileResponse,
+    thParams :: THandleParams XFTPVersion,
     config :: XFTPClientConfig
   }
 
@@ -97,7 +99,9 @@ getXFTPClient transportSession@(_, srv, _) config@XFTPClientConfig {xftpNetworkC
   let usePort = if null port then "443" else port
       clientDisconnected = readTVarIO clientVar >>= mapM_ disconnected
   http2Client <- liftEitherError xftpClientError $ getVerifiedHTTP2Client (Just username) useHost usePort (Just keyHash) Nothing http2Config clientDisconnected
-  let c = XFTPClient {http2Client, transportSession, config}
+  let HTTP2Client {sessionId} = http2Client
+      thParams = THandleParams {sessionId, blockSize = xftpBlockSize, thVersion = currentXFTPVersion, thAuth = Nothing, implySessId = False, batch = True}
+      c = XFTPClient {http2Client, thParams, transportSession, config}
   atomically $ writeTVar clientVar $ Just c
   pure c
 
@@ -130,25 +134,29 @@ xftpClientError = \case
   HCNetworkError -> PCENetworkError
   HCIOError e -> PCEIOError e
 
-sendXFTPCommand :: forall p. FilePartyI p => XFTPClient -> C.APrivateSignKey -> XFTPFileId -> FileCommand p -> Maybe XFTPChunkSpec -> ExceptT XFTPClientError IO (FileResponse, HTTP2Body)
-sendXFTPCommand XFTPClient {config, http2Client = http2@HTTP2Client {sessionId}} pKey fId cmd chunkSpec_ = do
+sendXFTPCommand :: forall p. FilePartyI p => XFTPClient -> C.APrivateAuthKey -> XFTPFileId -> FileCommand p -> Maybe XFTPChunkSpec -> ExceptT XFTPClientError IO (FileResponse, HTTP2Body)
+sendXFTPCommand c@XFTPClient {thParams} pKey fId cmd chunkSpec_ = do
   t <-
     liftEither . first PCETransportError $
-      xftpEncodeTransmission sessionId (Just pKey) ("", fId, FileCmd (sFileParty @p) cmd)
-  let req = H.requestStreaming N.methodPost "/" [] $ streamBody t
+      xftpEncodeAuthTransmission thParams pKey ("", fId, FileCmd (sFileParty @p) cmd)
+  sendXFTPTransmission c t chunkSpec_
+
+sendXFTPTransmission :: XFTPClient -> ByteString -> Maybe XFTPChunkSpec -> ExceptT XFTPClientError IO (FileResponse, HTTP2Body)
+sendXFTPTransmission XFTPClient {config, thParams, http2Client} t chunkSpec_ = do
+  let req = H.requestStreaming N.methodPost "/" [] streamBody
       reqTimeout = (\XFTPChunkSpec {chunkSize} -> chunkTimeout config chunkSize) <$> chunkSpec_
-  HTTP2Response {respBody = body@HTTP2Body {bodyHead}} <- liftEitherError xftpClientError $ sendRequest http2 req reqTimeout
+  HTTP2Response {respBody = body@HTTP2Body {bodyHead}} <- liftEitherError xftpClientError $ sendRequest http2Client req reqTimeout
   when (B.length bodyHead /= xftpBlockSize) $ throwError $ PCEResponseError BLOCK
   -- TODO validate that the file ID is the same as in the request?
-  (_, _, (_, _fId, respOrErr)) <- liftEither . first PCEResponseError $ xftpDecodeTransmission sessionId bodyHead
+  (_, _, (_, _fId, respOrErr)) <- liftEither . first PCEResponseError $ xftpDecodeTransmission thParams bodyHead
   case respOrErr of
     Right r -> case protocolError r of
       Just e -> throwError $ PCEProtocolError e
       _ -> pure (r, body)
     Left e -> throwError $ PCEResponseError e
   where
-    streamBody :: ByteString -> (Builder -> IO ()) -> IO () -> IO ()
-    streamBody t send done = do
+    streamBody :: (Builder -> IO ()) -> IO () -> IO ()
+    streamBody send done = do
       send $ byteString t
       forM_ chunkSpec_ $ \XFTPChunkSpec {filePath, chunkOffset, chunkSize} ->
         withFile filePath ReadMode $ \h -> do
@@ -158,9 +166,9 @@ sendXFTPCommand XFTPClient {config, http2Client = http2@HTTP2Client {sessionId}}
 
 createXFTPChunk ::
   XFTPClient ->
-  C.APrivateSignKey ->
+  C.APrivateAuthKey ->
   FileInfo ->
-  NonEmpty C.APublicVerifyKey ->
+  NonEmpty C.APublicAuthKey ->
   Maybe BasicAuth ->
   ExceptT XFTPClientError IO (SenderId, NonEmpty RecipientId)
 createXFTPChunk c spKey file rcps auth_ =
@@ -168,19 +176,19 @@ createXFTPChunk c spKey file rcps auth_ =
     (FRSndIds sId rIds, body) -> noFile body (sId, rIds)
     (r, _) -> throwError . PCEUnexpectedResponse $ bshow r
 
-addXFTPRecipients :: XFTPClient -> C.APrivateSignKey -> XFTPFileId -> NonEmpty C.APublicVerifyKey -> ExceptT XFTPClientError IO (NonEmpty RecipientId)
+addXFTPRecipients :: XFTPClient -> C.APrivateAuthKey -> XFTPFileId -> NonEmpty C.APublicAuthKey -> ExceptT XFTPClientError IO (NonEmpty RecipientId)
 addXFTPRecipients c spKey fId rcps =
   sendXFTPCommand c spKey fId (FADD rcps) Nothing >>= \case
     (FRRcvIds rIds, body) -> noFile body rIds
     (r, _) -> throwError . PCEUnexpectedResponse $ bshow r
 
-uploadXFTPChunk :: XFTPClient -> C.APrivateSignKey -> XFTPFileId -> XFTPChunkSpec -> ExceptT XFTPClientError IO ()
+uploadXFTPChunk :: XFTPClient -> C.APrivateAuthKey -> XFTPFileId -> XFTPChunkSpec -> ExceptT XFTPClientError IO ()
 uploadXFTPChunk c spKey fId chunkSpec =
   sendXFTPCommand c spKey fId FPUT (Just chunkSpec) >>= okResponse
 
-downloadXFTPChunk :: XFTPClient -> C.APrivateSignKey -> XFTPFileId -> XFTPRcvChunkSpec -> ExceptT XFTPClientError IO ()
-downloadXFTPChunk c@XFTPClient {config} rpKey fId chunkSpec@XFTPRcvChunkSpec {filePath, chunkSize} = do
-  (rDhKey, rpDhKey) <- liftIO C.generateKeyPair'
+downloadXFTPChunk :: TVar ChaChaDRG -> XFTPClient -> C.APrivateAuthKey -> XFTPFileId -> XFTPRcvChunkSpec -> ExceptT XFTPClientError IO ()
+downloadXFTPChunk g c@XFTPClient {config} rpKey fId chunkSpec@XFTPRcvChunkSpec {filePath, chunkSize} = do
+  (rDhKey, rpDhKey) <- atomically $ C.generateKeyPair g
   sendXFTPCommand c rpKey fId (FGET rDhKey) Nothing >>= \case
     (FRFile sDhKey cbNonce, HTTP2Body {bodyHead = _bg, bodySize = _bs, bodyPart}) -> case bodyPart of
       -- TODO atm bodySize is set to 0, so chunkSize will be incorrect - validate once set
@@ -200,12 +208,22 @@ downloadXFTPChunk c@XFTPClient {config} rpKey fId chunkSpec@XFTPRcvChunkSpec {fi
 chunkTimeout :: XFTPClientConfig -> Word32 -> Int
 chunkTimeout config chunkSize = fromIntegral $ (fromIntegral chunkSize * uploadTimeoutPerMb config) `div` mb 1
 
-deleteXFTPChunk :: XFTPClient -> C.APrivateSignKey -> SenderId -> ExceptT XFTPClientError IO ()
+deleteXFTPChunk :: XFTPClient -> C.APrivateAuthKey -> SenderId -> ExceptT XFTPClientError IO ()
 deleteXFTPChunk c spKey sId = sendXFTPCommand c spKey sId FDEL Nothing >>= okResponse
 
-ackXFTPChunk :: XFTPClient -> C.APrivateSignKey -> RecipientId -> ExceptT XFTPClientError IO ()
+ackXFTPChunk :: XFTPClient -> C.APrivateAuthKey -> RecipientId -> ExceptT XFTPClientError IO ()
 ackXFTPChunk c rpKey rId = sendXFTPCommand c rpKey rId FACK Nothing >>= okResponse
 
+pingXFTP :: XFTPClient -> ExceptT XFTPClientError IO ()
+pingXFTP c@XFTPClient {thParams} = do
+  t <-
+    liftEither . first PCETransportError $
+      xftpEncodeTransmission thParams ("", "", FileCmd SFRecipient PING)
+  (r, _) <- sendXFTPTransmission c t Nothing
+  case r of
+    FRPong -> pure ()
+    _ -> throwError $ PCEUnexpectedResponse $ bshow r
+
 okResponse :: (FileResponse, HTTP2Body) -> ExceptT XFTPClientError IO ()
 okResponse = \case
   (FROk, body) -> noFile body ()

src/Simplex/FileTransfer/Client/Main.hs

@@ -19,6 +19,7 @@ module Simplex.FileTransfer.Client.Main
     prepareChunkSizes,
     prepareChunkSpecs,
     maxFileSize,
+    maxFileSizeHard,
     fileSizeLen,
     getChunkDigest,
     SentRecipientReplica (..),
@@ -28,7 +29,7 @@ where
 import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
-import Crypto.Random (getRandomBytes)
+import Crypto.Random (ChaChaDRG)
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.Bifunctor (first)
 import Data.ByteString.Char8 (ByteString)
@@ -63,7 +64,7 @@ import qualified Simplex.Messaging.Crypto.Lazy as LC
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String (StrEncoding (..))
 import Simplex.Messaging.Parsers (parseAll)
-import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), SenderId, SndPrivateSignKey, XFTPServer, XFTPServerWithAuth)
+import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), SenderId, SndPrivateAuthKey, XFTPServer, XFTPServerWithAuth)
 import Simplex.Messaging.Server.CLI (getCliCommand')
 import Simplex.Messaging.Util (groupAllOn, ifM, tshow, whenM)
 import System.Exit (exitFailure)
@@ -76,12 +77,17 @@ import UnliftIO.Directory
 xftpClientVersion :: String
 xftpClientVersion = "1.0.1"
 
+-- | Soft limit for XFTP clients. Should be checked and reported to user.
 maxFileSize :: Int64
 maxFileSize = gb 1
 
 maxFileSizeStr :: String
 maxFileSizeStr = B.unpack . strEncode $ FileSize maxFileSize
 
+-- | Hard internal limit for XFTP agent after which it refuses to prepare chunks.
+maxFileSizeHard :: Int64
+maxFileSizeHard = gb 5
+
 fileSizeLen :: Int64
 fileSizeLen = 8
 
@@ -209,25 +215,25 @@ cliCommandP =
 data SentFileChunk = SentFileChunk
   { chunkNo :: Int,
     sndId :: SenderId,
-    sndPrivateKey :: SndPrivateSignKey,
+    sndPrivateKey :: SndPrivateAuthKey,
     chunkSize :: FileSize Word32,
     digest :: FileDigest,
     replicas :: [SentFileChunkReplica]
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 data SentFileChunkReplica = SentFileChunkReplica
   { server :: XFTPServer,
-    recipients :: [(ChunkReplicaId, C.APrivateSignKey)]
+    recipients :: [(ChunkReplicaId, C.APrivateAuthKey)]
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 data SentRecipientReplica = SentRecipientReplica
   { chunkNo :: Int,
     server :: XFTPServer,
     rcvNo :: Int,
     replicaId :: ChunkReplicaId,
-    replicaKey :: C.APrivateSignKey,
+    replicaKey :: C.APrivateAuthKey,
     digest :: FileDigest,
     chunkSize :: FileSize Word32
   }
@@ -264,10 +270,11 @@ cliSendFileOpts :: SendOptions -> Bool -> (Int64 -> Int64 -> IO ()) -> ExceptT C
 cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, retryCount, tempPath, verbose} printInfo notifyProgress = do
   let (_, fileName) = splitFileName filePath
   liftIO $ when printInfo $ printNoNewLine "Encrypting file..."
-  (encPath, fdRcv, fdSnd, chunkSpecs, encSize) <- encryptFileForUpload fileName
+  g <- liftIO C.newRandom
+  (encPath, fdRcv, fdSnd, chunkSpecs, encSize) <- encryptFileForUpload g fileName
   liftIO $ when printInfo $ printNoNewLine "Uploading file..."
   uploadedChunks <- newTVarIO []
-  sentChunks <- uploadFile chunkSpecs uploadedChunks encSize
+  sentChunks <- uploadFile g chunkSpecs uploadedChunks encSize
   whenM (doesFileExist encPath) $ removeFile encPath
   -- TODO if only small chunks, use different default size
   liftIO $ do
@@ -280,13 +287,13 @@ cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, re
       putStrLn "Pass file descriptions to the recipient(s):"
     forM_ fdRcvPaths putStrLn
   where
-    encryptFileForUpload :: String -> ExceptT CLIError IO (FilePath, FileDescription 'FRecipient, FileDescription 'FSender, [XFTPChunkSpec], Int64)
-    encryptFileForUpload fileName = do
+    encryptFileForUpload :: TVar ChaChaDRG -> String -> ExceptT CLIError IO (FilePath, FileDescription 'FRecipient, FileDescription 'FSender, [XFTPChunkSpec], Int64)
+    encryptFileForUpload g fileName = do
       fileSize <- fromInteger <$> getFileSize filePath
       when (fileSize > maxFileSize) $ throwError $ CLIError $ "Files bigger than " <> maxFileSizeStr <> " are not supported"
       encPath <- getEncPath tempPath "xftp"
-      key <- liftIO C.randomSbKey
-      nonce <- liftIO C.randomCbNonce
+      key <- atomically $ C.randomSbKey g
+      nonce <- atomically $ C.randomCbNonce g
       let fileHdr = smpEncode FileHeader {fileName, fileExtra = Nothing}
           fileSize' = fromIntegral (B.length fileHdr) + fileSize
           chunkSizes = prepareChunkSizes $ fileSize' + fileSizeLen + authTagSize
@@ -297,12 +304,12 @@ cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, re
       withExceptT (CLIError . show) $ encryptFile srcFile fileHdr key nonce fileSize' encSize encPath
       digest <- liftIO $ LC.sha512Hash <$> LB.readFile encPath
       let chunkSpecs = prepareChunkSpecs encPath chunkSizes
-          fdRcv = FileDescription {party = SFRecipient, size = FileSize encSize, digest = FileDigest digest, key, nonce, chunkSize = FileSize defChunkSize, chunks = []}
-          fdSnd = FileDescription {party = SFSender, size = FileSize encSize, digest = FileDigest digest, key, nonce, chunkSize = FileSize defChunkSize, chunks = []}
+          fdRcv = FileDescription {party = SFRecipient, size = FileSize encSize, digest = FileDigest digest, key, nonce, chunkSize = FileSize defChunkSize, chunks = [], redirect = Nothing}
+          fdSnd = FileDescription {party = SFSender, size = FileSize encSize, digest = FileDigest digest, key, nonce, chunkSize = FileSize defChunkSize, chunks = [], redirect = Nothing}
       logInfo $ "encrypted file to " <> tshow encPath
       pure (encPath, fdRcv, fdSnd, chunkSpecs, encSize)
-    uploadFile :: [XFTPChunkSpec] -> TVar [Int64] -> Int64 -> ExceptT CLIError IO [SentFileChunk]
-    uploadFile chunks uploadedChunks encSize = do
+    uploadFile :: TVar ChaChaDRG -> [XFTPChunkSpec] -> TVar [Int64] -> Int64 -> ExceptT CLIError IO [SentFileChunk]
+    uploadFile g chunks uploadedChunks encSize = do
       a <- atomically $ newXFTPAgent defaultXFTPClientAgentConfig
       gen <- newTVarIO =<< liftIO newStdGen
       let xftpSrvs = fromMaybe defaultXFTPServers (nonEmpty xftpServers)
@@ -318,8 +325,8 @@ cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, re
         uploadFileChunk :: XFTPClientAgent -> (Int, XFTPChunkSpec, XFTPServerWithAuth) -> ExceptT CLIError IO (Int, SentFileChunk)
         uploadFileChunk a (chunkNo, chunkSpec@XFTPChunkSpec {chunkSize}, ProtoServerWithAuth xftpServer auth) = do
           logInfo $ "uploading chunk " <> tshow chunkNo <> " to " <> showServer xftpServer <> "..."
-          (sndKey, spKey) <- liftIO $ C.generateSignatureKeyPair C.SEd25519
-          rKeys <- liftIO $ L.fromList <$> replicateM numRecipients (C.generateSignatureKeyPair C.SEd25519)
+          (sndKey, spKey) <- atomically $ C.generateAuthKeyPair C.SEd25519 g
+          rKeys <- atomically $ L.fromList <$> replicateM numRecipients (C.generateAuthKeyPair C.SEd25519 g)
           digest <- liftIO $ getChunkDigest chunkSpec
           let ch = FileInfo {sndKey, size = fromIntegral chunkSize, digest}
           c <- withRetry retryCount $ getXFTPServerClient a xftpServer
@@ -387,7 +394,7 @@ cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, re
             sentChunks
         -- SentFileChunk having sndId and sndPrivateKey represents the current implementation's limitation
         -- that sender uploads each chunk only to one server, so we can use the first replica's server for FileChunkReplica
-        sndReplicas :: [SentFileChunkReplica] -> ChunkReplicaId -> C.APrivateSignKey -> [FileChunkReplica]
+        sndReplicas :: [SentFileChunkReplica] -> ChunkReplicaId -> C.APrivateAuthKey -> [FileChunkReplica]
         sndReplicas [] _ _ = []
         sndReplicas (SentFileChunkReplica {server} : _) replicaId replicaKey = [FileChunkReplica {server, replicaId, replicaKey}]
     writeFileDescriptions :: String -> [FileDescription 'FRecipient] -> FileDescription 'FSender -> IO ([FilePath], FilePath)
@@ -423,7 +430,8 @@ cliReceiveFile ReceiveOptions {fileDescription, filePath, retryCount, tempPath,
             [] -> error "empty FileChunk.replicas"
             FileChunkReplica {server} : _ -> server
           srvChunks = groupAllOn srv chunks
-      chunkPaths <- map snd . sortOn fst . concat <$> pooledForConcurrentlyN 16 srvChunks (mapM $ downloadFileChunk a encPath size downloadedChunks)
+      g <- liftIO C.newRandom
+      chunkPaths <- map snd . sortOn fst . concat <$> pooledForConcurrentlyN 16 srvChunks (mapM $ downloadFileChunk g a encPath size downloadedChunks)
       encDigest <- liftIO $ LC.sha512Hash <$> readChunks chunkPaths
       when (encDigest /= unFileDigest digest) $ throwError $ CLIError "File digest mismatch"
       encSize <- liftIO $ foldM (\s path -> (s +) . fromIntegral <$> getFileSize path) 0 chunkPaths
@@ -435,13 +443,13 @@ cliReceiveFile ReceiveOptions {fileDescription, filePath, retryCount, tempPath,
       liftIO $ do
         printNoNewLine $ "File downloaded: " <> path
         removeFD yes fileDescription
-    downloadFileChunk :: XFTPClientAgent -> FilePath -> FileSize Int64 -> TVar [Int64] -> FileChunk -> ExceptT CLIError IO (Int, FilePath)
-    downloadFileChunk a encPath (FileSize encSize) downloadedChunks FileChunk {chunkNo, chunkSize, digest, replicas = replica : _} = do
+    downloadFileChunk :: TVar ChaChaDRG -> XFTPClientAgent -> FilePath -> FileSize Int64 -> TVar [Int64] -> FileChunk -> ExceptT CLIError IO (Int, FilePath)
+    downloadFileChunk g a encPath (FileSize encSize) downloadedChunks FileChunk {chunkNo, chunkSize, digest, replicas = replica : _} = do
       let FileChunkReplica {server, replicaId, replicaKey} = replica
       logInfo $ "downloading chunk " <> tshow chunkNo <> " from " <> showServer server <> "..."
       chunkPath <- uniqueCombine encPath $ show chunkNo
       let chunkSpec = XFTPRcvChunkSpec chunkPath (unFileSize chunkSize) (unFileDigest digest)
-      withReconnect a server retryCount $ \c -> downloadXFTPChunk c replicaKey (unChunkReplicaId replicaId) chunkSpec
+      withReconnect a server retryCount $ \c -> downloadXFTPChunk g c replicaKey (unChunkReplicaId replicaId) chunkSpec
       logInfo $ "downloaded chunk " <> tshow chunkNo <> " to " <> T.pack chunkPath
       downloaded <- atomically . stateTVar downloadedChunks $ \cs ->
         let cs' = fromIntegral (unFileSize chunkSize) : cs in (sum cs', cs')
@@ -449,7 +457,7 @@ cliReceiveFile ReceiveOptions {fileDescription, filePath, retryCount, tempPath,
         printProgress "Downloaded" downloaded encSize
         when verbose $ putStrLn ""
       pure (chunkNo, chunkPath)
-    downloadFileChunk _ _ _ _ _ = throwError $ CLIError "chunk has no replicas"
+    downloadFileChunk _ _ _ _ _ _ = throwError $ CLIError "chunk has no replicas"
     getFilePath :: String -> ExceptT String IO FilePath
     getFilePath name =
       case filePath of
@@ -525,9 +533,8 @@ prepareChunkSizes size' = prepareSizes size'
   where
     (smallSize, bigSize)
       | size' > size34 chunkSize3 = (chunkSize2, chunkSize3)
-      | otherwise = (chunkSize1, chunkSize2)
-    --  | size' > size34 chunkSize2 = (chunkSize1, chunkSize2)
-    --  | otherwise = (chunkSize0, chunkSize1)
+      | size' > size34 chunkSize2 = (chunkSize1, chunkSize2)
+      | otherwise = (chunkSize0, chunkSize1)
     size34 sz = (fromIntegral sz * 3) `div` 4
     prepareSizes 0 = []
     prepareSizes size
@@ -593,7 +600,8 @@ cliRandomFile RandomFileOptions {filePath, fileSize = FileSize size} = do
   putStrLn $ "File created: " <> filePath
   where
     saveRandomFile h sz = do
-      bytes <- getRandomBytes $ fromIntegral $ min mb' sz
+      g <- C.newRandom
+      bytes <- atomically $ C.randomBytes (fromIntegral $ min mb' sz) g
       B.hPut h bytes
       when (sz > mb') $ saveRandomFile h (sz - mb')
     mb' = mb 1

src/Simplex/FileTransfer/Description.hs

@@ -12,6 +12,7 @@
 
 module Simplex.FileTransfer.Description
   ( FileDescription (..),
+    RedirectFileInfo (..),
     AFileDescription (..),
     ValidFileDescription, -- constructor is not exported, use pattern
     pattern ValidFileDescription,
@@ -30,12 +31,17 @@ module Simplex.FileTransfer.Description
     kb,
     mb,
     gb,
+    FileDescriptionURI (..),
+    FileClientData,
+    fileDescriptionURI,
+    qrSizeLimit,
   )
 where
 
 import Control.Applicative (optional)
 import Control.Monad ((<=<))
 import Data.Aeson (FromJSON, ToJSON)
+import qualified Data.Aeson as J
 import qualified Data.Aeson.TH as J
 import Data.Attoparsec.ByteString.Char8 (Parser)
 import qualified Data.Attoparsec.ByteString.Char8 as A
@@ -50,17 +56,21 @@ import Data.Map (Map)
 import qualified Data.Map as M
 import Data.Maybe (fromMaybe)
 import Data.String
+import Data.Text (Text)
+import Data.Text.Encoding (encodeUtf8)
 import Data.Word (Word32)
 import qualified Data.Yaml as Y
 import Database.SQLite.Simple.FromField (FromField (..))
 import Database.SQLite.Simple.ToField (ToField (..))
 import Simplex.FileTransfer.Chunks
 import Simplex.FileTransfer.Protocol
+import Simplex.Messaging.Agent.QueryString
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (defaultJSON, parseAll)
 import Simplex.Messaging.Protocol (XFTPServer)
-import Simplex.Messaging.Util (bshow, (<$?>))
+import Simplex.Messaging.ServiceScheme (ServiceScheme (..))
+import Simplex.Messaging.Util (bshow, safeDecodeUtf8, (<$?>))
 
 data FileDescription (p :: FileParty) = FileDescription
   { party :: SFileParty p,
@@ -69,7 +79,14 @@ data FileDescription (p :: FileParty) = FileDescription
     key :: C.SbKey,
     nonce :: C.CbNonce,
     chunkSize :: FileSize Word32,
-    chunks :: [FileChunk]
+    chunks :: [FileChunk],
+    redirect :: Maybe RedirectFileInfo
+  }
+  deriving (Eq, Show)
+
+data RedirectFileInfo = RedirectFileInfo
+  { size :: FileSize Int64,
+    digest :: FileDigest
   }
   deriving (Eq, Show)
 
@@ -118,7 +135,7 @@ data FileChunk = FileChunk
 data FileChunkReplica = FileChunkReplica
   { server :: XFTPServer,
     replicaId :: ChunkReplicaId,
-    replicaKey :: C.APrivateSignKey
+    replicaKey :: C.APrivateAuthKey
   }
   deriving (Eq, Show)
 
@@ -147,7 +164,8 @@ data YAMLFileDescription = YAMLFileDescription
     key :: C.SbKey,
     nonce :: C.CbNonce,
     chunkSize :: String,
-    replicas :: [YAMLServerReplicas]
+    replicas :: [YAMLServerReplicas],
+    redirect :: Maybe RedirectFileInfo
   }
   deriving (Eq, Show)
 
@@ -161,7 +179,7 @@ data FileServerReplica = FileServerReplica
   { chunkNo :: Int,
     server :: XFTPServer,
     replicaId :: ChunkReplicaId,
-    replicaKey :: C.APrivateSignKey,
+    replicaKey :: C.APrivateAuthKey,
     digest :: Maybe FileDigest,
     chunkSize :: Maybe (FileSize Word32)
   }
@@ -170,8 +188,16 @@ data FileServerReplica = FileServerReplica
 newtype FileSize a = FileSize {unFileSize :: a}
   deriving (Eq, Show)
 
+instance FromJSON a => FromJSON (FileSize a) where
+  parseJSON v = FileSize <$> Y.parseJSON v
+
+instance ToJSON a => ToJSON (FileSize a) where
+  toJSON = Y.toJSON . unFileSize
+
 $(J.deriveJSON defaultJSON ''YAMLServerReplicas)
 
+$(J.deriveJSON defaultJSON ''RedirectFileInfo)
+
 $(J.deriveJSON defaultJSON ''YAMLFileDescription)
 
 instance FilePartyI p => StrEncoding (ValidFileDescription p) where
@@ -204,7 +230,7 @@ validateFileDescription fd@FileDescription {size, chunks}
     chunksSize = fromIntegral . foldl' (\s FileChunk {chunkSize} -> s + unFileSize chunkSize) 0
 
 encodeFileDescription :: FileDescription p -> YAMLFileDescription
-encodeFileDescription FileDescription {party, size, digest, key, nonce, chunkSize, chunks} =
+encodeFileDescription FileDescription {party, size, digest, key, nonce, chunkSize, chunks, redirect} =
   YAMLFileDescription
     { party = toFileParty party,
       size = B.unpack $ strEncode size,
@@ -212,9 +238,39 @@ encodeFileDescription FileDescription {party, size, digest, key, nonce, chunkSiz
       key,
       nonce,
       chunkSize = B.unpack $ strEncode chunkSize,
-      replicas = encodeFileReplicas chunkSize chunks
+      replicas = encodeFileReplicas chunkSize chunks,
+      redirect
     }
 
+data FileDescriptionURI = FileDescriptionURI
+  { scheme :: ServiceScheme,
+    description :: ValidFileDescription 'FRecipient,
+    clientData :: Maybe FileClientData -- JSON-encoded extensions to pass in a link
+  }
+  deriving (Eq, Show)
+
+type FileClientData = Text
+
+fileDescriptionURI :: ValidFileDescription 'FRecipient -> FileDescriptionURI
+fileDescriptionURI vfd = FileDescriptionURI SSSimplex vfd mempty
+
+instance StrEncoding FileDescriptionURI where
+  strEncode FileDescriptionURI {scheme, description, clientData} = mconcat [strEncode scheme, "/file", "#/?", queryStr]
+    where
+      queryStr = strEncode $ QSP QEscape qs
+      qs = ("desc", strEncode description) : maybe [] (\cd -> [("data", encodeUtf8 cd)]) clientData
+  strP = do
+    scheme <- strP
+    _ <- "/file" <* optional (A.char '/') <* "#/?"
+    query <- strP
+    description <- queryParam "desc" query
+    let clientData = safeDecodeUtf8 <$> queryParamStr "data" query
+    pure FileDescriptionURI {scheme, description, clientData}
+
+-- | URL length in QR code before jumping up to a next size.
+qrSizeLimit :: Int
+qrSizeLimit = 1002 -- ~2 chunks in URLencoded YAML with some spare size for server hosts
+
 instance (Integral a, Show a) => StrEncoding (FileSize a) where
   strEncode (FileSize b)
     | b' /= 0 = bshow b
@@ -285,13 +341,13 @@ unfoldChunksToReplicas defChunkSize = concatMap chunkReplicas
        in FileServerReplica {chunkNo, server, replicaId, replicaKey, digest = digest', chunkSize = chunkSize'}
 
 decodeFileDescription :: YAMLFileDescription -> Either String AFileDescription
-decodeFileDescription YAMLFileDescription {party, size, digest, key, nonce, chunkSize, replicas} = do
+decodeFileDescription YAMLFileDescription {party, size, digest, key, nonce, chunkSize, replicas, redirect} = do
   size' <- strDecode $ B.pack size
   chunkSize' <- strDecode $ B.pack chunkSize
   replicas' <- decodeFileParts replicas
   chunks <- foldReplicasToChunks chunkSize' replicas'
   pure $ case aFileParty party of
-    AFP party' -> AFD FileDescription {party = party', size = size', digest, key, nonce, chunkSize = chunkSize', chunks}
+    AFP party' -> AFD FileDescription {party = party', size = size', digest, key, nonce, chunkSize = chunkSize', chunks, redirect}
   where
     decodeFileParts = fmap concat . mapM decodeYAMLServerReplicas
 

src/Simplex/FileTransfer/Protocol.hs

@@ -1,21 +1,22 @@
 {-# LANGUAGE DataKinds #-}
+{-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE TupleSections #-}
 {-# LANGUAGE TypeApplications #-}
 {-# LANGUAGE TypeFamilies #-}
 {-# OPTIONS_GHC -fno-warn-unticked-promoted-constructors #-}
 
 module Simplex.FileTransfer.Protocol where
 
-import Control.Applicative ((<|>))
 import qualified Data.Aeson.TH as J
-import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.Bifunctor (first)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
@@ -24,10 +25,11 @@ import Data.List.NonEmpty (NonEmpty (..))
 import Data.Maybe (isNothing)
 import Data.Type.Equality
 import Data.Word (Word32)
+import Simplex.FileTransfer.Transport (VersionXFTP, XFTPErrorType (..), XFTPVersion, pattern VersionXFTP, xftpClientHandshake)
+import Simplex.Messaging.Client (authTransmission)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Notifications.Transport (ntfClientHandshake)
 import Simplex.Messaging.Parsers
 import Simplex.Messaging.Protocol
   ( BasicAuth,
@@ -38,26 +40,26 @@ import Simplex.Messaging.Protocol
     ProtocolMsgTag (..),
     ProtocolType (..),
     RcvPublicDhKey,
-    RcvPublicVerifyKey,
+    RcvPublicAuthKey,
     RecipientId,
     SenderId,
     SentRawTransmission,
     SignedTransmission,
-    SndPublicVerifyKey,
+    SndPublicAuthKey,
     Transmission,
+    TransmissionForAuth (..),
+    encodeTransmissionForAuth,
     encodeTransmission,
     messageTagP,
     tDecodeParseValidate,
-    tEncode,
-    tEncodeBatch,
+    tEncodeBatch1,
     tParse,
   )
-import Simplex.Messaging.Transport (SessionId, TransportError (..))
-import Simplex.Messaging.Util (bshow, (<$?>))
-import Simplex.Messaging.Version
+import Simplex.Messaging.Transport (THandleParams (..), TransportError (..))
+import Simplex.Messaging.Util ((<$?>))
 
-currentXFTPVersion :: Version
-currentXFTPVersion = 1
+currentXFTPVersion :: VersionXFTP
+currentXFTPVersion = VersionXFTP 1
 
 xftpBlockSize :: Int
 xftpBlockSize = 16384
@@ -139,18 +141,18 @@ instance ProtocolMsgTag FileCmdTag where
 instance FilePartyI p => ProtocolMsgTag (FileCommandTag p) where
   decodeTag s = decodeTag s >>= (\(FCT _ t) -> checkParty' t)
 
-instance Protocol XFTPErrorType FileResponse where
+instance Protocol XFTPVersion XFTPErrorType FileResponse where
   type ProtoCommand FileResponse = FileCmd
   type ProtoType FileResponse = 'PXFTP
-  protocolClientHandshake = ntfClientHandshake
+  protocolClientHandshake = xftpClientHandshake
   protocolPing = FileCmd SFRecipient PING
   protocolError = \case
     FRErr e -> Just e
     _ -> Nothing
 
 data FileCommand (p :: FileParty) where
-  FNEW :: FileInfo -> NonEmpty RcvPublicVerifyKey -> Maybe BasicAuth -> FileCommand FSender
-  FADD :: NonEmpty RcvPublicVerifyKey -> FileCommand FSender
+  FNEW :: FileInfo -> NonEmpty RcvPublicAuthKey -> Maybe BasicAuth -> FileCommand FSender
+  FADD :: NonEmpty RcvPublicAuthKey -> FileCommand FSender
   FPUT :: FileCommand FSender
   FDEL :: FileCommand FSender
   FGET :: RcvPublicDhKey -> FileCommand FRecipient
@@ -164,15 +166,15 @@ data FileCmd = forall p. FilePartyI p => FileCmd (SFileParty p) (FileCommand p)
 deriving instance Show FileCmd
 
 data FileInfo = FileInfo
-  { sndKey :: SndPublicVerifyKey,
+  { sndKey :: SndPublicAuthKey,
     size :: Word32,
     digest :: ByteString
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 type XFTPFileId = ByteString
 
-instance FilePartyI p => ProtocolEncoding XFTPErrorType (FileCommand p) where
+instance FilePartyI p => ProtocolEncoding XFTPVersion XFTPErrorType (FileCommand p) where
   type Tag (FileCommand p) = FileCommandTag p
   encodeProtocol _v = \case
     FNEW file rKeys auth_ -> e (FNEW_, ' ', file, rKeys, auth_)
@@ -188,24 +190,24 @@ instance FilePartyI p => ProtocolEncoding XFTPErrorType (FileCommand p) where
 
   protocolP v tag = (\(FileCmd _ c) -> checkParty c) <$?> protocolP v (FCT (sFileParty @p) tag)
 
-  fromProtocolError = fromProtocolError @XFTPErrorType @FileResponse
+  fromProtocolError = fromProtocolError @XFTPVersion @XFTPErrorType @FileResponse
   {-# INLINE fromProtocolError #-}
 
-  checkCredentials (sig, _, fileId, _) cmd = case cmd of
+  checkCredentials (auth, _, fileId, _) cmd = case cmd of
     -- FNEW must not have signature and chunk ID
     FNEW {}
-      | isNothing sig -> Left $ CMD NO_AUTH
+      | isNothing auth -> Left $ CMD NO_AUTH
       | not (B.null fileId) -> Left $ CMD HAS_AUTH
       | otherwise -> Right cmd
     PING
-      | isNothing sig && B.null fileId -> Right cmd
+      | isNothing auth && B.null fileId -> Right cmd
       | otherwise -> Left $ CMD HAS_AUTH
     -- other client commands must have both signature and queue ID
     _
-      | isNothing sig || B.null fileId -> Left $ CMD NO_AUTH
+      | isNothing auth || B.null fileId -> Left $ CMD NO_AUTH
       | otherwise -> Right cmd
 
-instance ProtocolEncoding XFTPErrorType FileCmd where
+instance ProtocolEncoding XFTPVersion XFTPErrorType FileCmd where
   type Tag FileCmd = FileCmdTag
   encodeProtocol _v (FileCmd _ c) = encodeProtocol _v c
 
@@ -222,7 +224,7 @@ instance ProtocolEncoding XFTPErrorType FileCmd where
         FACK_ -> pure FACK
         PING_ -> pure PING
 
-  fromProtocolError = fromProtocolError @XFTPErrorType @FileResponse
+  fromProtocolError = fromProtocolError @XFTPVersion @XFTPErrorType @FileResponse
   {-# INLINE fromProtocolError #-}
 
   checkCredentials t (FileCmd p c) = FileCmd p <$> checkCredentials t c
@@ -273,7 +275,7 @@ data FileResponse
   | FRPong
   deriving (Show)
 
-instance ProtocolEncoding XFTPErrorType FileResponse where
+instance ProtocolEncoding XFTPVersion XFTPErrorType FileResponse where
   type Tag FileResponse = FileResponseTag
   encodeProtocol _v = \case
     FRSndIds fId rIds -> e (FRSndIds_, ' ', fId, rIds)
@@ -316,74 +318,6 @@ instance ProtocolEncoding XFTPErrorType FileResponse where
         | B.null entId = Right cmd
         | otherwise = Left $ CMD HAS_AUTH
 
-data XFTPErrorType
-  = -- | incorrect block format, encoding or signature size
-    BLOCK
-  | -- | incorrect SMP session ID (TLS Finished message / tls-unique binding RFC5929)
-    SESSION
-  | -- | SMP command is unknown or has invalid syntax
-    CMD {cmdErr :: CommandError}
-  | -- | command authorization error - bad signature or non-existing SMP queue
-    AUTH
-  | -- | incorrent file size
-    SIZE
-  | -- | storage quota exceeded
-    QUOTA
-  | -- | incorrent file digest
-    DIGEST
-  | -- | file encryption/decryption failed
-    CRYPTO
-  | -- | no expected file body in request/response or no file on the server
-    NO_FILE
-  | -- | unexpected file body
-    HAS_FILE
-  | -- | file IO error
-    FILE_IO
-  | -- | internal server error
-    INTERNAL
-  | -- | used internally, never returned by the server (to be removed)
-    DUPLICATE_ -- not part of SMP protocol, used internally
-  deriving (Eq, Read, Show)
-
-instance StrEncoding XFTPErrorType where
-  strEncode = \case
-    CMD e -> "CMD " <> bshow e
-    e -> bshow e
-  strP = "CMD " *> (CMD <$> parseRead1) <|> parseRead1
-
-instance Encoding XFTPErrorType where
-  smpEncode = \case
-    BLOCK -> "BLOCK"
-    SESSION -> "SESSION"
-    CMD err -> "CMD " <> smpEncode err
-    AUTH -> "AUTH"
-    SIZE -> "SIZE"
-    QUOTA -> "QUOTA"
-    DIGEST -> "DIGEST"
-    CRYPTO -> "CRYPTO"
-    NO_FILE -> "NO_FILE"
-    HAS_FILE -> "HAS_FILE"
-    FILE_IO -> "FILE_IO"
-    INTERNAL -> "INTERNAL"
-    DUPLICATE_ -> "DUPLICATE_"
-
-  smpP =
-    A.takeTill (== ' ') >>= \case
-      "BLOCK" -> pure BLOCK
-      "SESSION" -> pure SESSION
-      "CMD" -> CMD <$> _smpP
-      "AUTH" -> pure AUTH
-      "SIZE" -> pure SIZE
-      "QUOTA" -> pure QUOTA
-      "DIGEST" -> pure DIGEST
-      "CRYPTO" -> pure CRYPTO
-      "NO_FILE" -> pure NO_FILE
-      "HAS_FILE" -> pure HAS_FILE
-      "FILE_IO" -> pure FILE_IO
-      "INTERNAL" -> pure INTERNAL
-      "DUPLICATE_" -> pure DUPLICATE_
-      _ -> fail "bad error type"
-
 checkParty :: forall t p p'. (FilePartyI p, FilePartyI p') => t p' -> Either String (t p)
 checkParty c = case testEquality (sFileParty @p) (sFileParty @p') of
   Just Refl -> Right c
@@ -394,27 +328,25 @@ checkParty' c = case testEquality (sFileParty @p) (sFileParty @p') of
   Just Refl -> Just c
   _ -> Nothing
 
-xftpEncodeTransmission :: ProtocolEncoding e c => SessionId -> Maybe C.APrivateSignKey -> Transmission c -> Either TransportError ByteString
-xftpEncodeTransmission sessionId pKey (corrId, fId, msg) = do
-  let t = encodeTransmission currentXFTPVersion sessionId (corrId, fId, msg)
-  xftpEncodeBatch1 $ signTransmission t
-  where
-    signTransmission :: ByteString -> SentRawTransmission
-    signTransmission t = ((`C.sign` t) <$> pKey, t)
+xftpEncodeAuthTransmission :: ProtocolEncoding XFTPVersion e c => THandleParams XFTPVersion -> C.APrivateAuthKey -> Transmission c -> Either TransportError ByteString
+xftpEncodeAuthTransmission thParams pKey (corrId, fId, msg) = do
+  let TransmissionForAuth {tForAuth, tToSend} = encodeTransmissionForAuth thParams (corrId, fId, msg)
+  xftpEncodeBatch1 . (,tToSend) =<< authTransmission Nothing (Just pKey) corrId tForAuth
+
+xftpEncodeTransmission :: ProtocolEncoding XFTPVersion e c => THandleParams XFTPVersion -> Transmission c -> Either TransportError ByteString
+xftpEncodeTransmission thParams (corrId, fId, msg) = do
+  let t = encodeTransmission thParams (corrId, fId, msg)
+  xftpEncodeBatch1 (Nothing, t)
 
 -- this function uses batch syntax but puts only one transmission in the batch
-xftpEncodeBatch1 :: (Maybe C.ASignature, ByteString) -> Either TransportError ByteString
-xftpEncodeBatch1 (sig, t) =
-  let t' = tEncodeBatch 1 . smpEncode . Large $ tEncode (sig, t)
-   in first (const TELargeMsg) $ C.pad t' xftpBlockSize
+xftpEncodeBatch1 :: SentRawTransmission -> Either TransportError ByteString
+xftpEncodeBatch1 t = first (const TELargeMsg) $ C.pad (tEncodeBatch1 t) xftpBlockSize
 
-xftpDecodeTransmission :: ProtocolEncoding e c => SessionId -> ByteString -> Either XFTPErrorType (SignedTransmission e c)
-xftpDecodeTransmission sessionId t = do
+xftpDecodeTransmission :: ProtocolEncoding XFTPVersion e c => THandleParams XFTPVersion -> ByteString -> Either XFTPErrorType (SignedTransmission e c)
+xftpDecodeTransmission thParams t = do
   t' <- first (const BLOCK) $ C.unPad t
-  case tParse True t' of
-    t'' :| [] -> Right $ tDecodeParseValidate sessionId currentXFTPVersion t''
+  case tParse thParams t' of
+    t'' :| [] -> Right $ tDecodeParseValidate thParams t''
     _ -> Left BLOCK
 
 $(J.deriveJSON (enumJSON $ dropPrefix "F") ''FileParty)
-
-$(J.deriveJSON (sumTypeJSON id) ''XFTPErrorType)

src/Simplex/FileTransfer/Server.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
@@ -14,9 +15,7 @@ module Simplex.FileTransfer.Server where
 import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
-import Control.Monad.IO.Unlift (MonadUnliftIO)
 import Control.Monad.Reader
-import Crypto.Random (getRandomBytes)
 import Data.Bifunctor (first)
 import qualified Data.ByteString.Base64.URL as B64
 import Data.ByteString.Builder (byteString)
@@ -33,9 +32,13 @@ import Data.Time.Clock (UTCTime (..), diffTimeToPicoseconds, getCurrentTime)
 import Data.Time.Clock.System (SystemTime (..), getSystemTime)
 import Data.Time.Format.ISO8601 (iso8601Show)
 import Data.Word (Word32)
+import GHC.IO.Handle (hSetNewlineMode)
+import GHC.Stats (getRTSStats)
 import qualified Network.HTTP.Types as N
 import qualified Network.HTTP2.Server as H
+import Network.Socket
 import Simplex.FileTransfer.Protocol
+import Simplex.FileTransfer.Server.Control
 import Simplex.FileTransfer.Server.Env
 import Simplex.FileTransfer.Server.Stats
 import Simplex.FileTransfer.Server.Store
@@ -44,24 +47,34 @@ import Simplex.FileTransfer.Transport
 import qualified Simplex.Messaging.Crypto as C
 import qualified Simplex.Messaging.Crypto.Lazy as LC
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (CorrId, RcvPublicDhKey, RcvPublicVerifyKey, RecipientId)
-import Simplex.Messaging.Server (dummyVerifyCmd, verifyCmdSignature)
+import Simplex.Messaging.Protocol (CorrId, RcvPublicDhKey, RcvPublicAuthKey, RecipientId, TransmissionAuth)
+import Simplex.Messaging.Server (dummyVerifyCmd, verifyCmdAuthorization)
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Server.Stats
+import Simplex.Messaging.Transport (THandleParams (..))
+import Simplex.Messaging.Transport.Buffer (trimCR)
 import Simplex.Messaging.Transport.HTTP2
 import Simplex.Messaging.Transport.HTTP2.Server
+import Simplex.Messaging.Transport.Server (runTCPServer)
 import Simplex.Messaging.Util
 import System.Exit (exitFailure)
 import System.FilePath ((</>))
-import System.IO (BufferMode (..), hPutStrLn, hSetBuffering)
-import UnliftIO (IOMode (..), withFile)
+import System.IO (hPrint, hPutStrLn, universalNewlineMode)
+import UnliftIO
 import UnliftIO.Concurrent (threadDelay)
 import UnliftIO.Directory (doesFileExist, removeFile, renameFile)
-import UnliftIO.Exception
-import UnliftIO.STM
+import qualified UnliftIO.Exception as E
 
 type M a = ReaderT XFTPEnv IO a
 
+data XFTPTransportRequest =
+  XFTPTransportRequest
+    { thParams :: THandleParams XFTPVersion,
+      reqBody :: HTTP2Body,
+      request :: H.Request,
+      sendResponse :: H.Response -> IO ()
+    }
+
 runXFTPServer :: XFTPServerConfig -> IO ()
 runXFTPServer cfg = do
   started <- newEmptyTMVarIO
@@ -71,18 +84,19 @@ runXFTPServerBlocking :: TMVar Bool -> XFTPServerConfig -> IO ()
 runXFTPServerBlocking started cfg = newXFTPServerEnv cfg >>= runReaderT (xftpServer cfg started)
 
 xftpServer :: XFTPServerConfig -> TMVar Bool -> M ()
-xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig} started = do
+xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpiration} started = do
   restoreServerStats
-  raceAny_ (runServer : expireFilesThread_ cfg <> serverStatsThread_ cfg) `finally` stopServer
+  raceAny_ (runServer : expireFilesThread_ cfg <> serverStatsThread_ cfg <> controlPortThread_ cfg) `finally` stopServer
   where
     runServer :: M ()
     runServer = do
       serverParams <- asks tlsServerParams
       env <- ask
       liftIO $
-        runHTTP2Server started xftpPort defaultHTTP2BufferSize serverParams transportConfig $ \sessionId r sendResponse -> do
+        runHTTP2Server started xftpPort defaultHTTP2BufferSize serverParams transportConfig inactiveClientExpiration $ \sessionId r sendResponse -> do
           reqBody <- getHTTP2Body r xftpBlockSize
-          processRequest HTTP2Request {sessionId, request = r, reqBody, sendResponse} `runReaderT` env
+          let thParams = THandleParams {sessionId, blockSize = xftpBlockSize, thVersion = currentXFTPVersion, thAuth = Nothing, implySessId = False, batch = True}
+          processRequest XFTPTransportRequest {thParams, request = r, reqBody, sendResponse} `runReaderT` env
 
     stopServer :: M ()
     stopServer = do
@@ -104,16 +118,19 @@ xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig} started = do
         forM_ sIds $ \sId -> do
           threadDelay 100000
           atomically (expiredFilePath st sId old)
-            >>= mapM_ (remove $ delete st sId)
+            >>= mapM_ (maybeRemove $ delete st sId)
       where
+        maybeRemove del = maybe del (remove del)
         remove del filePath =
           ifM
             (doesFileExist filePath)
-            (removeFile filePath >> del `catch` \(e :: SomeException) -> logError $ "failed to remove expired file " <> tshow filePath <> ": " <> tshow e)
+            ((removeFile filePath >> del) `catch` \(e :: SomeException) -> logError $ "failed to remove expired file " <> tshow filePath <> ": " <> tshow e)
             del
         delete st sId = do
           withFileLog (`logDeleteFile` sId)
           void $ atomically $ deleteFile st sId
+          FileServerStats {filesExpired} <- asks serverStats
+          atomically $ modifyTVar' filesExpired (+ 1)
 
     serverStatsThread_ :: XFTPServerConfig -> [M ()]
     serverStatsThread_ XFTPServerConfig {logStatsInterval = Just interval, logStatsStartTime, serverStatsLogFile} =
@@ -125,7 +142,7 @@ xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig} started = do
       initialDelay <- (startAt -) . fromIntegral . (`div` 1000000_000000) . diffTimeToPicoseconds . utctDayTime <$> liftIO getCurrentTime
       liftIO $ putStrLn $ "server stats log enabled: " <> statsFilePath
       liftIO $ threadDelay' $ 1_000_000 * (initialDelay + if initialDelay < 0 then 86_400 else 0)
-      FileServerStats {fromTime, filesCreated, fileRecipients, filesUploaded, filesDeleted, filesDownloaded, fileDownloads, fileDownloadAcks, filesCount, filesSize} <- asks serverStats
+      FileServerStats {fromTime, filesCreated, fileRecipients, filesUploaded, filesExpired, filesDeleted, filesDownloaded, fileDownloads, fileDownloadAcks, filesCount, filesSize} <- asks serverStats
       let interval = 1_000_000 * logInterval
       forever $ do
         withFile statsFilePath AppendMode $ \h -> liftIO $ do
@@ -135,12 +152,13 @@ xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig} started = do
           filesCreated' <- atomically $ swapTVar filesCreated 0
           fileRecipients' <- atomically $ swapTVar fileRecipients 0
           filesUploaded' <- atomically $ swapTVar filesUploaded 0
+          filesExpired' <- atomically $ swapTVar filesExpired 0
           filesDeleted' <- atomically $ swapTVar filesDeleted 0
           files <- atomically $ periodStatCounts filesDownloaded ts
           fileDownloads' <- atomically $ swapTVar fileDownloads 0
           fileDownloadAcks' <- atomically $ swapTVar fileDownloadAcks 0
-          filesCount' <- atomically $ swapTVar filesCount 0
-          filesSize' <- atomically $ swapTVar filesSize 0
+          filesCount' <- readTVarIO filesCount
+          filesSize' <- readTVarIO filesSize
           hPutStrLn h $
             intercalate
               ","
@@ -155,21 +173,63 @@ xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig} started = do
                 show fileDownloads',
                 show fileDownloadAcks',
                 show filesCount',
-                show filesSize'
+                show filesSize',
+                show filesExpired'
               ]
         liftIO $ threadDelay' interval
 
+    controlPortThread_ :: XFTPServerConfig -> [M ()]
+    controlPortThread_ XFTPServerConfig {controlPort = Just port} = [runCPServer port]
+    controlPortThread_ _ = []
+
+    runCPServer :: ServiceName -> M ()
+    runCPServer port = do
+      cpStarted <- newEmptyTMVarIO
+      u <- askUnliftIO
+      liftIO $ do
+        labelMyThread "control port server"
+        runTCPServer cpStarted port $ runCPClient u
+      where
+        runCPClient :: UnliftIO (ReaderT XFTPEnv IO) -> Socket -> IO ()
+        runCPClient u sock = do
+          labelMyThread "control port client"
+          h <- socketToHandle sock ReadWriteMode
+          hSetBuffering h LineBuffering
+          hSetNewlineMode h universalNewlineMode
+          hPutStrLn h "XFTP server control port\n'help' for supported commands"
+          cpLoop h
+          where
+            cpLoop h = do
+              s <- B.hGetLine h
+              case strDecode $ trimCR s of
+                Right CPQuit -> hClose h
+                Right cmd -> processCP h cmd >> cpLoop h
+                Left err -> hPutStrLn h ("error: " <> err) >> cpLoop h
+            processCP h = \case
+              CPStatsRTS -> E.tryAny getRTSStats >>= either (hPrint h) (hPrint h)
+              CPDelete fileId -> unliftIO u $ do
+                fs <- asks store
+                r <- runExceptT $ do
+                  let asSender = ExceptT . atomically $ getFile fs SFSender fileId
+                  let asRecipient = ExceptT . atomically $ getFile fs SFRecipient fileId
+                  (fr, _) <- asSender `catchError` const asRecipient
+                  ExceptT $ deleteServerFile_ fr
+                liftIO . hPutStrLn h $ either (\e -> "error: " <> show e) (\() -> "ok") r
+              CPHelp -> hPutStrLn h "commands: stats-rts, delete, help, quit"
+              CPQuit -> pure ()
+              CPSkip -> pure ()
+
 data ServerFile = ServerFile
   { filePath :: FilePath,
     fileSize :: Word32,
     sbState :: LC.SbState
   }
 
-processRequest :: HTTP2Request -> M ()
-processRequest HTTP2Request {sessionId, reqBody = body@HTTP2Body {bodyHead}, sendResponse}
+processRequest :: XFTPTransportRequest -> M ()
+processRequest XFTPTransportRequest {thParams, reqBody = body@HTTP2Body {bodyHead}, sendResponse}
   | B.length bodyHead /= xftpBlockSize = sendXFTPResponse ("", "", FRErr BLOCK) Nothing
   | otherwise = do
-      case xftpDecodeTransmission sessionId bodyHead of
+      case xftpDecodeTransmission thParams bodyHead of
         Right (sig_, signed, (corrId, fId, cmdOrErr)) -> do
           case cmdOrErr of
             Right cmd -> do
@@ -183,7 +243,7 @@ processRequest HTTP2Request {sessionId, reqBody = body@HTTP2Body {bodyHead}, sen
   where
     sendXFTPResponse :: (CorrId, XFTPFileId, FileResponse) -> Maybe ServerFile -> M ()
     sendXFTPResponse (corrId, fId, resp) serverFile_ = do
-      let t_ = xftpEncodeTransmission sessionId Nothing (corrId, fId, resp)
+      let t_ = xftpEncodeTransmission thParams (corrId, fId, resp)
       liftIO $ sendResponse $ H.responseStreaming N.ok200 [] $ streamBody t_
       where
         streamBody t_ send done = do
@@ -200,10 +260,10 @@ processRequest HTTP2Request {sessionId, reqBody = body@HTTP2Body {bodyHead}, sen
 
 data VerificationResult = VRVerified XFTPRequest | VRFailed
 
-verifyXFTPTransmission :: Maybe C.ASignature -> ByteString -> XFTPFileId -> FileCmd -> M VerificationResult
-verifyXFTPTransmission sig_ signed fId cmd =
+verifyXFTPTransmission :: Maybe TransmissionAuth -> ByteString -> XFTPFileId -> FileCmd -> M VerificationResult
+verifyXFTPTransmission tAuth authorized fId cmd =
   case cmd of
-    FileCmd SFSender (FNEW file rcps auth) -> pure $ XFTPReqNew file rcps auth `verifyWith` sndKey file
+    FileCmd SFSender (FNEW file rcps auth') -> pure $ XFTPReqNew file rcps auth' `verifyWith` sndKey file
     FileCmd SFRecipient PING -> pure $ VRVerified XFTPReqPing
     FileCmd party _ -> verifyCmd party
   where
@@ -214,8 +274,9 @@ verifyXFTPTransmission sig_ signed fId cmd =
       where
         verify = \case
           Right (fr, k) -> XFTPReqCmd fId fr cmd `verifyWith` k
-          _ -> maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
-    req `verifyWith` k = if verifyCmdSignature sig_ signed k then VRVerified req else VRFailed
+          _ -> maybe False (dummyVerifyCmd Nothing authorized) tAuth `seq` VRFailed
+    -- TODO verify with DH authorization
+    req `verifyWith` k = if verifyCmdAuthorization Nothing tAuth authorized k then VRVerified req else VRFailed
 
 processXFTPRequest :: HTTP2Body -> XFTPRequest -> M (FileResponse, Maybe ServerFile)
 processXFTPRequest HTTP2Body {bodyPart} = \case
@@ -236,7 +297,7 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
   XFTPReqPing -> noFile FRPong
   where
     noFile resp = pure (resp, Nothing)
-    createFile :: FileInfo -> NonEmpty RcvPublicVerifyKey -> M FileResponse
+    createFile :: FileInfo -> NonEmpty RcvPublicAuthKey -> M FileResponse
     createFile file rks = do
       st <- asks store
       r <- runExceptT $ do
@@ -260,7 +321,7 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
       retryAdd n $ \sId -> runExceptT $ do
         ExceptT $ addFile st sId file ts
         pure sId
-    addRecipientRetry :: FileStore -> Int -> XFTPFileId -> RcvPublicVerifyKey -> M (Either XFTPErrorType FileRecipient)
+    addRecipientRetry :: FileStore -> Int -> XFTPFileId -> RcvPublicAuthKey -> M (Either XFTPErrorType FileRecipient)
     addRecipientRetry st n sId rpk =
       retryAdd n $ \rId -> runExceptT $ do
         let rcp = FileRecipient rId rpk
@@ -273,7 +334,7 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
       atomically (add fId) >>= \case
         Left DUPLICATE_ -> retryAdd (n - 1) add
         r -> pure r
-    addRecipients :: XFTPFileId -> NonEmpty RcvPublicVerifyKey -> M FileResponse
+    addRecipients :: XFTPFileId -> NonEmpty RcvPublicAuthKey -> M FileResponse
     addRecipients sId rks = do
       st <- asks store
       r <- runExceptT $ do
@@ -318,9 +379,10 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
     sendServerFile FileRec {senderId, filePath, fileInfo = FileInfo {size}} rDhKey = do
       readTVarIO filePath >>= \case
         Just path -> do
-          (sDhKey, spDhKey) <- liftIO C.generateKeyPair'
+          g <- asks random
+          (sDhKey, spDhKey) <- atomically $ C.generateKeyPair g
           let dhSecret = C.dh' rDhKey spDhKey
-          cbNonce <- liftIO C.randomCbNonce
+          cbNonce <- atomically $ C.randomCbNonce g
           case LC.cbInit dhSecret cbNonce of
             Right sbState -> do
               stats <- asks serverStats
@@ -331,21 +393,7 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
         _ -> pure (FRErr NO_FILE, Nothing)
 
     deleteServerFile :: FileRec -> M FileResponse
-    deleteServerFile FileRec {senderId, fileInfo, filePath} = do
-      withFileLog (`logDeleteFile` senderId)
-      r <- runExceptT $ do
-        path <- readTVarIO filePath
-        stats <- asks serverStats
-        ExceptT $ first (\(_ :: SomeException) -> FILE_IO) <$> try (forM_ path $ \p -> whenM (doesFileExist p) (removeFile p >> deletedStats stats))
-        st <- asks store
-        void $ atomically $ deleteFile st senderId
-        atomically $ modifyTVar' (filesDeleted stats) (+ 1)
-        pure FROk
-      either (pure . FRErr) pure r
-      where
-        deletedStats stats = do
-          atomically $ modifyTVar' (filesCount stats) (subtract 1)
-          atomically $ modifyTVar' (filesSize stats) (subtract $ fromIntegral $ size fileInfo)
+    deleteServerFile fr = either FRErr (\() -> FROk) <$> deleteServerFile_ fr
 
     logFileError :: SomeException -> IO ()
     logFileError e = logError $ "Error deleting file: " <> tshow e
@@ -359,13 +407,28 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
       atomically $ modifyTVar' (fileDownloadAcks stats) (+ 1)
       pure FROk
 
+deleteServerFile_ :: FileRec -> M (Either XFTPErrorType ())
+deleteServerFile_ FileRec {senderId, fileInfo, filePath} = do
+  withFileLog (`logDeleteFile` senderId)
+  runExceptT $ do
+    path <- readTVarIO filePath
+    stats <- asks serverStats
+    ExceptT $ first (\(_ :: SomeException) -> FILE_IO) <$> try (forM_ path $ \p -> whenM (doesFileExist p) (removeFile p >> deletedStats stats))
+    st <- asks store
+    void $ atomically $ deleteFile st senderId
+    atomically $ modifyTVar' (filesDeleted stats) (+ 1)
+  where
+    deletedStats stats = do
+      atomically $ modifyTVar' (filesCount stats) (subtract 1)
+      atomically $ modifyTVar' (filesSize stats) (subtract $ fromIntegral $ size fileInfo)
+
 randomId :: (MonadUnliftIO m, MonadReader XFTPEnv m) => Int -> m ByteString
-randomId n = do
-  gVar <- asks idsDrg
-  atomically (C.pseudoRandomBytes n gVar)
+randomId n = atomically . C.randomBytes n =<< asks random
 
 getFileId :: M XFTPFileId
-getFileId = liftIO . getRandomBytes =<< asks (fileIdSize . config)
+getFileId = do
+  size <- asks (fileIdSize . config)
+  atomically . C.randomBytes size =<< asks random
 
 withFileLog :: (MonadIO m, MonadReader XFTPEnv m) => (StoreLog 'WriteMode -> IO a) -> m ()
 withFileLog action = liftIO . mapM_ action =<< asks storeLog
@@ -391,14 +454,17 @@ restoreServerStats = asks (serverStatsBackupFile . config) >>= mapM_ restoreStat
     restoreStats f = whenM (doesFileExist f) $ do
       logInfo $ "restoring server stats from file " <> T.pack f
       liftIO (strDecode <$> B.readFile f) >>= \case
-        Right d -> do
+        Right d@FileServerStatsData {_filesCount = statsFilesCount, _filesSize = statsFilesSize} -> do
           s <- asks serverStats
-          fs <- readTVarIO . files =<< asks store
-          let _filesCount = length $ M.keys fs
-              _filesSize = M.foldl' (\n -> (n +) . fromIntegral . size . fileInfo) 0 fs
+          FileStore {files, usedStorage} <- asks store
+          _filesCount <- M.size <$> readTVarIO files
+          _filesSize <- readTVarIO usedStorage
           atomically $ setFileServerStats s d {_filesCount, _filesSize}
           renameFile f $ f <> ".bak"
           logInfo "server stats restored"
+          when (statsFilesCount /= _filesCount) $ logWarn $ "Files count differs: stats: " <> tshow statsFilesCount <> ", store: " <> tshow _filesCount
+          when (statsFilesSize /= _filesSize) $ logWarn $ "Files size differs: stats: " <> tshow statsFilesSize <> ", store: " <> tshow _filesSize
+          logInfo $ "Restored " <> tshow (_filesSize `div` 1048576) <> " MBs in " <> tshow _filesCount <> " files"
         Left e -> do
           logInfo $ "error restoring server stats: " <> T.pack e
           liftIO exitFailure

src/Simplex/FileTransfer/Server/Control.hs

@@ -0,0 +1,31 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.FileTransfer.Server.Control where
+
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import Data.ByteString (ByteString)
+import Simplex.Messaging.Encoding.String
+
+data ControlProtocol
+  = CPStatsRTS
+  | CPDelete ByteString
+  | CPHelp
+  | CPQuit
+  | CPSkip
+
+instance StrEncoding ControlProtocol where
+  strEncode = \case
+    CPStatsRTS -> "stats-rts"
+    CPDelete bs -> "delete " <> strEncode bs
+    CPHelp -> "help"
+    CPQuit -> "quit"
+    CPSkip -> ""
+  strP =
+    A.takeTill (== ' ') >>= \case
+      "stats-rts" -> pure CPStatsRTS
+      "delete" -> CPDelete <$> (A.space *> strP)
+      "help" -> pure CPHelp
+      "quit" -> pure CPQuit
+      "" -> pure CPSkip
+      _ -> fail "bad ControlProtocol command"

src/Simplex/FileTransfer/Server/Env.hs

@@ -24,7 +24,7 @@ import Simplex.FileTransfer.Server.Stats
 import Simplex.FileTransfer.Server.Store
 import Simplex.FileTransfer.Server.StoreLog
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Protocol (BasicAuth, RcvPublicVerifyKey)
+import Simplex.Messaging.Protocol (BasicAuth, RcvPublicAuthKey)
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Transport.Server (TransportServerConfig, loadFingerprint, loadTLSServerParams)
 import Simplex.Messaging.Util (tshow)
@@ -33,6 +33,7 @@ import UnliftIO.STM
 
 data XFTPServerConfig = XFTPServerConfig
   { xftpPort :: ServiceName,
+    controlPort :: Maybe ServiceName,
     fileIdSize :: Int,
     storeLogFile :: Maybe FilePath,
     filesPath :: FilePath,
@@ -46,6 +47,8 @@ data XFTPServerConfig = XFTPServerConfig
     newFileBasicAuth :: Maybe BasicAuth,
     -- | time after which the files can be removed and check interval, seconds
     fileExpiration :: Maybe ExpirationConfig,
+    -- | time after which inactive clients can be disconnected and check interval, seconds
+    inactiveClientExpiration :: Maybe ExpirationConfig,
     -- CA certificate private key is not needed for initialization
     caCertificateFile :: FilePath,
     privateKeyFile :: FilePath,
@@ -58,11 +61,18 @@ data XFTPServerConfig = XFTPServerConfig
     transportConfig :: TransportServerConfig
   }
 
+defaultInactiveClientExpiration :: ExpirationConfig
+defaultInactiveClientExpiration =
+  ExpirationConfig
+    { ttl = 43200, -- seconds, 12 hours
+      checkInterval = 3600 -- seconds, 1 hours
+    }
+
 data XFTPEnv = XFTPEnv
   { config :: XFTPServerConfig,
     store :: FileStore,
     storeLog :: Maybe (StoreLog 'WriteMode),
-    idsDrg :: TVar ChaChaDRG,
+    random :: TVar ChaChaDRG,
     serverIdentity :: C.KeyHash,
     tlsServerParams :: T.ServerParams,
     serverStats :: FileServerStats
@@ -80,7 +90,7 @@ defaultFileExpiration =
 
 newXFTPServerEnv :: (MonadUnliftIO m, MonadRandom m) => XFTPServerConfig -> m XFTPEnv
 newXFTPServerEnv config@XFTPServerConfig {storeLogFile, fileSizeQuota, caCertificateFile, certificateFile, privateKeyFile} = do
-  idsDrg <- drgNew >>= newTVarIO
+  random <- liftIO C.newRandom
   store <- atomically newFileStore
   storeLog <- liftIO $ mapM (`readWriteFileStore` store) storeLogFile
   used <- readTVarIO (usedStorage store)
@@ -90,9 +100,9 @@ newXFTPServerEnv config@XFTPServerConfig {storeLogFile, fileSizeQuota, caCertifi
   tlsServerParams <- liftIO $ loadTLSServerParams caCertificateFile certificateFile privateKeyFile
   Fingerprint fp <- liftIO $ loadFingerprint caCertificateFile
   serverStats <- atomically . newFileServerStats =<< liftIO getCurrentTime
-  pure XFTPEnv {config, store, storeLog, idsDrg, tlsServerParams, serverIdentity = C.KeyHash fp, serverStats}
+  pure XFTPEnv {config, store, storeLog, random, tlsServerParams, serverIdentity = C.KeyHash fp, serverStats}
 
 data XFTPRequest
-  = XFTPReqNew FileInfo (NonEmpty RcvPublicVerifyKey) (Maybe BasicAuth)
+  = XFTPReqNew FileInfo (NonEmpty RcvPublicAuthKey) (Maybe BasicAuth)
   | XFTPReqCmd XFTPFileId FileRec FileCmd
   | XFTPReqPing

src/Simplex/FileTransfer/Server/Main.hs

@@ -19,12 +19,13 @@ import Options.Applicative
 import Simplex.FileTransfer.Chunks
 import Simplex.FileTransfer.Description (FileSize (..))
 import Simplex.FileTransfer.Server (runXFTPServer)
-import Simplex.FileTransfer.Server.Env (XFTPServerConfig (..), defFileExpirationHours, defaultFileExpiration)
+import Simplex.FileTransfer.Server.Env (XFTPServerConfig (..), defFileExpirationHours, defaultFileExpiration, defaultInactiveClientExpiration)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), pattern XFTPServer)
 import Simplex.Messaging.Server.CLI
 import Simplex.Messaging.Server.Expiration
+import Simplex.Messaging.Transport (simplexMQVersion)
 import Simplex.Messaging.Transport.Client (TransportHost (..))
 import Simplex.Messaging.Transport.Server (TransportServerConfig (..), defaultTransportServerConfig)
 import System.Directory (createDirectoryIfMissing, doesFileExist)
@@ -32,9 +33,6 @@ import System.FilePath (combine)
 import System.IO (BufferMode (..), hSetBuffering, stderr, stdout)
 import Text.Read (readMaybe)
 
-xftpServerVersion :: String
-xftpServerVersion = "1.1.3"
-
 xftpServerCLI :: FilePath -> FilePath -> IO ()
 xftpServerCLI cfgPath logPath = do
   getCliCommand' (cliCommandP cfgPath logPath iniFile) serverVersion >>= \case
@@ -42,6 +40,10 @@ xftpServerCLI cfgPath logPath = do
       doesFileExist iniFile >>= \case
         True -> exitError $ "Error: server is already initialized (" <> iniFile <> " exists).\nRun `" <> executableName <> " start`."
         _ -> initializeServer opts
+    OnlineCert certOpts ->
+      doesFileExist iniFile >>= \case
+        True -> genOnline cfgPath certOpts
+        _ -> exitError $ "Error: server is not initialized (" <> iniFile <> " does not exist).\nRun `" <> executableName <> " init`."
     Start ->
       doesFileExist iniFile >>= \case
         True -> readIniFile iniFile >>= either exitError runServer
@@ -53,7 +55,7 @@ xftpServerCLI cfgPath logPath = do
       putStrLn "Deleted configuration and log files"
   where
     iniFile = combine cfgPath "file-server.ini"
-    serverVersion = "SimpleX XFTP server v" <> xftpServerVersion
+    serverVersion = "SimpleX XFTP server v" <> simplexMQVersion
     defaultServerPort = "443"
     executableName = "file-server"
     storeLogFilePath = combine logPath "file-server-store.log"
@@ -100,10 +102,17 @@ xftpServerCLI cfgPath logPath = do
             <> ("host: " <> host <> "\n")
             <> ("port: " <> defaultServerPort <> "\n")
             <> "log_tls_errors: off\n\
+               \# control_port: 5226\n\
                \\n\
                \[FILES]\n"
             <> ("path: " <> filesPath <> "\n")
             <> ("storage_quota: " <> B.unpack (strEncode fileSizeQuota) <> "\n")
+            <> "\n\
+               \[INACTIVE_CLIENTS]\n\
+               \# TTL and interval to check inactive clients\n\
+               \disconnect: off\n"
+            <> ("# ttl: " <> show (ttl defaultInactiveClientExpiration) <> "\n")
+            <> ("# check_interval: " <> show (checkInterval defaultInactiveClientExpiration) <> "\n")
     runServer ini = do
       hSetBuffering stdout LineBuffering
       hSetBuffering stderr LineBuffering
@@ -118,13 +127,16 @@ xftpServerCLI cfgPath logPath = do
         enableStoreLog = settingIsOn "STORE_LOG" "enable" ini
         logStats = settingIsOn "STORE_LOG" "log_stats" ini
         c = combine cfgPath . ($ defaultX509Config)
-        printXFTPConfig XFTPServerConfig {allowNewFiles, newFileBasicAuth, xftpPort, storeLogFile, fileExpiration} = do
+        printXFTPConfig XFTPServerConfig {allowNewFiles, newFileBasicAuth, xftpPort, storeLogFile, fileExpiration, inactiveClientExpiration} = do
           putStrLn $ case storeLogFile of
             Just f -> "Store log: " <> f
             _ -> "Store log disabled."
           putStrLn $ case fileExpiration of
             Just ExpirationConfig {ttl} -> "expiring files after " <> showTTL ttl
             _ -> "not expiring files"
+          putStrLn $ case inactiveClientExpiration of
+            Just ExpirationConfig {ttl, checkInterval} -> "expiring clients inactive for " <> show ttl <> " seconds every " <> show checkInterval <> " seconds"
+            _ -> "not expiring inactive clients"
           putStrLn $
             "Uploading new files "
               <> if allowNewFiles
@@ -135,6 +147,7 @@ xftpServerCLI cfgPath logPath = do
         serverConfig =
           XFTPServerConfig
             { xftpPort = T.unpack $ strictIni "TRANSPORT" "port" ini,
+              controlPort = either (const Nothing) (Just . T.unpack) $ lookupValue "TRANSPORT" "control_port" ini,
               fileIdSize = 16,
               storeLogFile = enableStoreLog $> storeLogFilePath,
               filesPath = T.unpack $ strictIni "FILES" "path" ini,
@@ -147,6 +160,12 @@ xftpServerCLI cfgPath logPath = do
                   defaultFileExpiration
                     { ttl = 3600 * readIniDefault defFileExpirationHours "STORE_LOG" "expire_files_hours" ini
                     },
+              inactiveClientExpiration =
+                settingIsOn "INACTIVE_CLIENTS" "disconnect" ini
+                  $> ExpirationConfig
+                    { ttl = readStrictIni "INACTIVE_CLIENTS" "ttl" ini,
+                      checkInterval = readStrictIni "INACTIVE_CLIENTS" "check_interval" ini
+                    },
               caCertificateFile = c caCrtFile,
               privateKeyFile = c serverKeyFile,
               certificateFile = c serverCrtFile,
@@ -162,6 +181,7 @@ xftpServerCLI cfgPath logPath = do
 
 data CliCommand
   = Init InitOptions
+  | OnlineCert CertOptions
   | Start
   | Delete
 
@@ -179,6 +199,7 @@ cliCommandP :: FilePath -> FilePath -> FilePath -> Parser CliCommand
 cliCommandP cfgPath logPath iniFile =
   hsubparser
     ( command "init" (info (Init <$> initP) (progDesc $ "Initialize server - creates " <> cfgPath <> " and " <> logPath <> " directories and configuration files"))
+        <> command "cert" (info (OnlineCert <$> certOptionsP) (progDesc $ "Generate new online TLS server credentials (configuration: " <> iniFile <> ")"))
         <> command "start" (info (pure Start) (progDesc $ "Start server (configuration: " <> iniFile <> ")"))
         <> command "delete" (info (pure Delete) (progDesc "Delete configuration and log files"))
     )

src/Simplex/FileTransfer/Server/Stats.hs

@@ -4,6 +4,7 @@
 
 module Simplex.FileTransfer.Server.Stats where
 
+import Control.Applicative ((<|>))
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import qualified Data.ByteString.Char8 as B
 import Data.Int (Int64)
@@ -18,6 +19,7 @@ data FileServerStats = FileServerStats
     filesCreated :: TVar Int,
     fileRecipients :: TVar Int,
     filesUploaded :: TVar Int,
+    filesExpired :: TVar Int,
     filesDeleted :: TVar Int,
     filesDownloaded :: PeriodStats SenderId,
     fileDownloads :: TVar Int,
@@ -31,6 +33,7 @@ data FileServerStatsData = FileServerStatsData
     _filesCreated :: Int,
     _fileRecipients :: Int,
     _filesUploaded :: Int,
+    _filesExpired :: Int,
     _filesDeleted :: Int,
     _filesDownloaded :: PeriodStatsData SenderId,
     _fileDownloads :: Int,
@@ -46,13 +49,14 @@ newFileServerStats ts = do
   filesCreated <- newTVar 0
   fileRecipients <- newTVar 0
   filesUploaded <- newTVar 0
+  filesExpired <- newTVar 0
   filesDeleted <- newTVar 0
   filesDownloaded <- newPeriodStats
   fileDownloads <- newTVar 0
   fileDownloadAcks <- newTVar 0
   filesCount <- newTVar 0
   filesSize <- newTVar 0
-  pure FileServerStats {fromTime, filesCreated, fileRecipients, filesUploaded, filesDeleted, filesDownloaded, fileDownloads, fileDownloadAcks, filesCount, filesSize}
+  pure FileServerStats {fromTime, filesCreated, fileRecipients, filesUploaded, filesExpired, filesDeleted, filesDownloaded, fileDownloads, fileDownloadAcks, filesCount, filesSize}
 
 getFileServerStatsData :: FileServerStats -> STM FileServerStatsData
 getFileServerStatsData s = do
@@ -60,13 +64,14 @@ getFileServerStatsData s = do
   _filesCreated <- readTVar $ filesCreated s
   _fileRecipients <- readTVar $ fileRecipients s
   _filesUploaded <- readTVar $ filesUploaded s
+  _filesExpired <- readTVar $ filesExpired s
   _filesDeleted <- readTVar $ filesDeleted s
   _filesDownloaded <- getPeriodStatsData $ filesDownloaded s
   _fileDownloads <- readTVar $ fileDownloads s
   _fileDownloadAcks <- readTVar $ fileDownloadAcks s
   _filesCount <- readTVar $ filesCount s
   _filesSize <- readTVar $ filesSize s
-  pure FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize}
+  pure FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesExpired, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize}
 
 setFileServerStats :: FileServerStats -> FileServerStatsData -> STM ()
 setFileServerStats s d = do
@@ -74,6 +79,7 @@ setFileServerStats s d = do
   writeTVar (filesCreated s) $! _filesCreated d
   writeTVar (fileRecipients s) $! _fileRecipients d
   writeTVar (filesUploaded s) $! _filesUploaded d
+  writeTVar (filesExpired s) $! _filesExpired d
   writeTVar (filesDeleted s) $! _filesDeleted d
   setPeriodStats (filesDownloaded s) $! _filesDownloaded d
   writeTVar (fileDownloads s) $! _fileDownloads d
@@ -82,13 +88,16 @@ setFileServerStats s d = do
   writeTVar (filesSize s) $! _filesSize d
 
 instance StrEncoding FileServerStatsData where
-  strEncode FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks} =
+  strEncode FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesExpired, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize} =
     B.unlines
       [ "fromTime=" <> strEncode _fromTime,
         "filesCreated=" <> strEncode _filesCreated,
         "fileRecipients=" <> strEncode _fileRecipients,
         "filesUploaded=" <> strEncode _filesUploaded,
+        "filesExpired=" <> strEncode _filesExpired,
         "filesDeleted=" <> strEncode _filesDeleted,
+        "filesCount=" <> strEncode _filesCount,
+        "filesSize=" <> strEncode _filesSize,
         "filesDownloaded:",
         strEncode _filesDownloaded,
         "fileDownloads=" <> strEncode _fileDownloads,
@@ -99,8 +108,11 @@ instance StrEncoding FileServerStatsData where
     _filesCreated <- "filesCreated=" *> strP <* A.endOfLine
     _fileRecipients <- "fileRecipients=" *> strP <* A.endOfLine
     _filesUploaded <- "filesUploaded=" *> strP <* A.endOfLine
+    _filesExpired <- "filesExpired=" *> strP <* A.endOfLine <|> pure 0
     _filesDeleted <- "filesDeleted=" *> strP <* A.endOfLine
+    _filesCount <- "filesCount=" *> strP <* A.endOfLine <|> pure 0
+    _filesSize <- "filesSize=" *> strP <* A.endOfLine <|> pure 0
     _filesDownloaded <- "filesDownloaded:" *> A.endOfLine *> strP <* A.endOfLine
     _fileDownloads <- "fileDownloads=" *> strP <* A.endOfLine
     _fileDownloadAcks <- "fileDownloadAcks=" *> strP <* A.endOfLine
-    pure FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount = 0, _filesSize = 0}
+    pure FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesExpired, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize}

src/Simplex/FileTransfer/Server/Store.hs

@@ -28,17 +28,18 @@ import Data.Int (Int64)
 import Data.Set (Set)
 import qualified Data.Set as S
 import Data.Time.Clock.System (SystemTime (..))
-import Simplex.FileTransfer.Protocol (FileInfo (..), SFileParty (..), XFTPErrorType (..), XFTPFileId)
+import Simplex.FileTransfer.Protocol (FileInfo (..), SFileParty (..), XFTPFileId)
+import Simplex.FileTransfer.Transport (XFTPErrorType (..))
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (RcvPublicVerifyKey, RecipientId, SenderId)
+import Simplex.Messaging.Protocol (RcvPublicAuthKey, RecipientId, SenderId)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Util (ifM, ($>>=))
 
 data FileStore = FileStore
   { files :: TMap SenderId FileRec,
-    recipients :: TMap RecipientId (SenderId, RcvPublicVerifyKey),
+    recipients :: TMap RecipientId (SenderId, RcvPublicAuthKey),
     usedStorage :: TVar Int64
   }
 
@@ -49,9 +50,8 @@ data FileRec = FileRec
     recipientIds :: TVar (Set RecipientId),
     createdAt :: SystemTime
   }
-  deriving (Eq)
 
-data FileRecipient = FileRecipient RecipientId RcvPublicVerifyKey
+data FileRecipient = FileRecipient RecipientId RcvPublicAuthKey
 
 instance StrEncoding FileRecipient where
   strEncode (FileRecipient rId rKey) = strEncode rId <> ":" <> strEncode rKey
@@ -113,7 +113,7 @@ deleteRecipient FileStore {recipients} rId FileRec {recipientIds} = do
   TM.delete rId recipients
   modifyTVar' recipientIds $ S.delete rId
 
-getFile :: FileStore -> SFileParty p -> XFTPFileId -> STM (Either XFTPErrorType (FileRec, C.APublicVerifyKey))
+getFile :: FileStore -> SFileParty p -> XFTPFileId -> STM (Either XFTPErrorType (FileRec, C.APublicAuthKey))
 getFile st party fId = case party of
   SFSender -> withFile st fId $ pure . Right . (\f -> (f, sndKey $ fileInfo f))
   SFRecipient ->
@@ -121,12 +121,12 @@ getFile st party fId = case party of
       Just (sId, rKey) -> withFile st sId $ pure . Right . (,rKey)
       _ -> pure $ Left AUTH
 
-expiredFilePath :: FileStore -> XFTPFileId -> Int64 -> STM (Maybe FilePath)
+expiredFilePath :: FileStore -> XFTPFileId -> Int64 -> STM (Maybe (Maybe FilePath))
 expiredFilePath FileStore {files} sId old =
   TM.lookup sId files
     $>>= \FileRec {filePath, createdAt} ->
       if systemSeconds createdAt < old
-        then readTVar filePath
+        then Just <$> readTVar filePath
         else pure Nothing
 
 ackFile :: FileStore -> RecipientId -> STM (Either XFTPErrorType ())

src/Simplex/FileTransfer/Server/StoreLog.hs

@@ -31,7 +31,7 @@ import Data.Time.Clock.System (SystemTime)
 import Simplex.FileTransfer.Protocol (FileInfo (..))
 import Simplex.FileTransfer.Server.Store
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (RcvPublicVerifyKey, RecipientId, SenderId)
+import Simplex.Messaging.Protocol (RcvPublicAuthKey, RecipientId, SenderId)
 import Simplex.Messaging.Server.StoreLog
 import Simplex.Messaging.Util (bshow, whenM)
 import System.Directory (doesFileExist, renameFile)
@@ -109,7 +109,7 @@ writeFileStore s FileStore {files, recipients} = do
   allRcps <- readTVarIO recipients
   readTVarIO files >>= mapM_ (logFile allRcps)
   where
-    logFile :: Map RecipientId (SenderId, RcvPublicVerifyKey) -> FileRec -> IO ()
+    logFile :: Map RecipientId (SenderId, RcvPublicAuthKey) -> FileRec -> IO ()
     logFile allRcps FileRec {senderId, fileInfo, filePath, recipientIds, createdAt} = do
       logAddFile s senderId fileInfo createdAt
       (rcpErrs, rcps) <- M.mapEither getRcp . M.fromSet id <$> readTVarIO recipientIds

src/Simplex/FileTransfer/Transport.hs

@@ -1,10 +1,19 @@
 {-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE MultiWayIf #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TemplateHaskell #-}
 
 module Simplex.FileTransfer.Transport
   ( supportedFileServerVRange,
+    xftpClientHandshake, -- stub
+    XFTPVersion,
+    VersionXFTP,
+    pattern VersionXFTP,
+    XFTPErrorType (..),
     XFTPRcvChunkSpec (..),
     ReceiveFileError (..),
     receiveFile,
@@ -14,22 +23,31 @@ module Simplex.FileTransfer.Transport
   )
 where
 
+import Control.Applicative ((<|>))
 import qualified Control.Exception as E
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Class
+import qualified Data.Aeson.TH as J
+import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.Bifunctor (first)
 import qualified Data.ByteArray as BA
 import Data.ByteString.Builder (Builder, byteString)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy.Char8 as LB
-import Data.Word (Word32)
-import Simplex.FileTransfer.Protocol (XFTPErrorType (..))
+import Data.Word (Word16, Word32)
 import qualified Simplex.Messaging.Crypto as C
 import qualified Simplex.Messaging.Crypto.Lazy as LC
+import Simplex.Messaging.Encoding
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Parsers
+import Simplex.Messaging.Protocol (CommandError)
+import Simplex.Messaging.Transport (HandshakeError (..), THandle, TransportError (..))
 import Simplex.Messaging.Transport.HTTP2.File
+import Simplex.Messaging.Util (bshow)
 import Simplex.Messaging.Version
+import Simplex.Messaging.Version.Internal
 import System.IO (Handle, IOMode (..), withFile)
 
 data XFTPRcvChunkSpec = XFTPRcvChunkSpec
@@ -39,8 +57,26 @@ data XFTPRcvChunkSpec = XFTPRcvChunkSpec
   }
   deriving (Show)
 
-supportedFileServerVRange :: VersionRange
-supportedFileServerVRange = mkVersionRange 1 1
+data XFTPVersion
+
+instance VersionScope XFTPVersion
+
+type VersionXFTP = Version XFTPVersion
+
+type VersionRangeXFTP = VersionRange XFTPVersion
+
+pattern VersionXFTP :: Word16 -> VersionXFTP
+pattern VersionXFTP v = Version v
+
+initialXFTPVersion :: VersionXFTP
+initialXFTPVersion = VersionXFTP 1
+
+supportedFileServerVRange :: VersionRangeXFTP
+supportedFileServerVRange = mkVersionRange initialXFTPVersion initialXFTPVersion
+
+-- XFTP protocol does not support handshake
+xftpClientHandshake :: c -> C.KeyPairX25519 -> C.KeyHash -> VersionRangeXFTP -> ExceptT TransportError IO (THandle XFTPVersion c)
+xftpClientHandshake _c _ks _keyHash _xftpVRange = throwError $ TEHandshake VERSION
 
 sendEncFile :: Handle -> (Builder -> IO ()) -> LC.SbState -> Word32 -> IO ()
 sendEncFile h send = go
@@ -97,3 +133,81 @@ receiveFile_ receive XFTPRcvChunkSpec {filePath, chunkSize, chunkDigest} = do
   ExceptT $ withFile filePath WriteMode (`receive` chunkSize)
   digest' <- liftIO $ LC.sha256Hash <$> LB.readFile filePath
   when (digest' /= chunkDigest) $ throwError DIGEST
+
+data XFTPErrorType
+  = -- | incorrect block format, encoding or signature size
+    BLOCK
+  | -- | incorrect SMP session ID (TLS Finished message / tls-unique binding RFC5929)
+    SESSION
+  | -- | SMP command is unknown or has invalid syntax
+    CMD {cmdErr :: CommandError}
+  | -- | command authorization error - bad signature or non-existing SMP queue
+    AUTH
+  | -- | incorrent file size
+    SIZE
+  | -- | storage quota exceeded
+    QUOTA
+  | -- | incorrent file digest
+    DIGEST
+  | -- | file encryption/decryption failed
+    CRYPTO
+  | -- | no expected file body in request/response or no file on the server
+    NO_FILE
+  | -- | unexpected file body
+    HAS_FILE
+  | -- | file IO error
+    FILE_IO
+  | -- | bad redirect data
+    REDIRECT {redirectError :: String}
+  | -- | internal server error
+    INTERNAL
+  | -- | used internally, never returned by the server (to be removed)
+    DUPLICATE_ -- not part of SMP protocol, used internally
+  deriving (Eq, Read, Show)
+
+instance StrEncoding XFTPErrorType where
+  strEncode = \case
+    CMD e -> "CMD " <> bshow e
+    REDIRECT e -> "REDIRECT " <> bshow e
+    e -> bshow e
+  strP =
+    "CMD " *> (CMD <$> parseRead1)
+      <|> "REDIRECT " *> (REDIRECT <$> parseRead A.takeByteString)
+      <|> parseRead1
+
+instance Encoding XFTPErrorType where
+  smpEncode = \case
+    BLOCK -> "BLOCK"
+    SESSION -> "SESSION"
+    CMD err -> "CMD " <> smpEncode err
+    AUTH -> "AUTH"
+    SIZE -> "SIZE"
+    QUOTA -> "QUOTA"
+    DIGEST -> "DIGEST"
+    CRYPTO -> "CRYPTO"
+    NO_FILE -> "NO_FILE"
+    HAS_FILE -> "HAS_FILE"
+    FILE_IO -> "FILE_IO"
+    REDIRECT err -> "REDIRECT " <> smpEncode err
+    INTERNAL -> "INTERNAL"
+    DUPLICATE_ -> "DUPLICATE_"
+
+  smpP =
+    A.takeTill (== ' ') >>= \case
+      "BLOCK" -> pure BLOCK
+      "SESSION" -> pure SESSION
+      "CMD" -> CMD <$> _smpP
+      "AUTH" -> pure AUTH
+      "SIZE" -> pure SIZE
+      "QUOTA" -> pure QUOTA
+      "DIGEST" -> pure DIGEST
+      "CRYPTO" -> pure CRYPTO
+      "NO_FILE" -> pure NO_FILE
+      "HAS_FILE" -> pure HAS_FILE
+      "FILE_IO" -> pure FILE_IO
+      "REDIRECT" -> REDIRECT <$> _smpP
+      "INTERNAL" -> pure INTERNAL
+      "DUPLICATE_" -> pure DUPLICATE_
+      _ -> fail "bad error type"
+
+$(J.deriveJSON (sumTypeJSON id) ''XFTPErrorType)

src/Simplex/FileTransfer/Types.hs

@@ -47,6 +47,7 @@ data RcvFile = RcvFile
     key :: C.SbKey,
     nonce :: C.CbNonce,
     chunkSize :: FileSize Word32,
+    redirect :: Maybe RcvFileRedirect,
     chunks :: [RcvFileChunk],
     prefixPath :: FilePath,
     tmpPath :: Maybe FilePath,
@@ -54,7 +55,7 @@ data RcvFile = RcvFile
     status :: RcvFileStatus,
     deleted :: Bool
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 data RcvFileStatus
   = RFSReceiving
@@ -95,18 +96,25 @@ data RcvFileChunk = RcvFileChunk
     fileTmpPath :: FilePath,
     chunkTmpPath :: Maybe FilePath
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 data RcvFileChunkReplica = RcvFileChunkReplica
   { rcvChunkReplicaId :: Int64,
     server :: XFTPServer,
     replicaId :: ChunkReplicaId,
-    replicaKey :: C.APrivateSignKey,
+    replicaKey :: C.APrivateAuthKey,
     received :: Bool,
     delay :: Maybe Int64,
     retries :: Int
   }
-  deriving (Eq, Show)
+  deriving (Show)
+
+data RcvFileRedirect = RcvFileRedirect
+  { redirectDbId :: DBRcvFileId,
+    redirectEntityId :: RcvFileId,
+    redirectFileInfo :: RedirectFileInfo
+  }
+  deriving (Show)
 
 -- Sending files
 
@@ -124,9 +132,10 @@ data SndFile = SndFile
     srcFile :: CryptoFile,
     prefixPath :: Maybe FilePath,
     status :: SndFileStatus,
-    deleted :: Bool
+    deleted :: Bool,
+    redirect :: Maybe RedirectFileInfo
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 sndFileEncPath :: FilePath -> FilePath
 sndFileEncPath prefixPath = prefixPath </> "xftp.encrypted"
@@ -173,7 +182,7 @@ data SndFileChunk = SndFileChunk
     digest :: FileDigest,
     replicas :: [SndFileChunkReplica]
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 sndChunkSize :: SndFileChunk -> Word32
 sndChunkSize SndFileChunk {chunkSpec = XFTPChunkSpec {chunkSize}} = chunkSize
@@ -181,22 +190,22 @@ sndChunkSize SndFileChunk {chunkSpec = XFTPChunkSpec {chunkSize}} = chunkSize
 data NewSndChunkReplica = NewSndChunkReplica
   { server :: XFTPServer,
     replicaId :: ChunkReplicaId,
-    replicaKey :: C.APrivateSignKey,
-    rcvIdsKeys :: [(ChunkReplicaId, C.APrivateSignKey)]
+    replicaKey :: C.APrivateAuthKey,
+    rcvIdsKeys :: [(ChunkReplicaId, C.APrivateAuthKey)]
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 data SndFileChunkReplica = SndFileChunkReplica
   { sndChunkReplicaId :: Int64,
     server :: XFTPServer,
     replicaId :: ChunkReplicaId,
-    replicaKey :: C.APrivateSignKey,
-    rcvIdsKeys :: [(ChunkReplicaId, C.APrivateSignKey)],
+    replicaKey :: C.APrivateAuthKey,
+    rcvIdsKeys :: [(ChunkReplicaId, C.APrivateAuthKey)],
     replicaStatus :: SndFileReplicaStatus,
     delay :: Maybe Int64,
     retries :: Int
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 data SndFileReplicaStatus
   = SFRSCreated
@@ -221,9 +230,9 @@ data DeletedSndChunkReplica = DeletedSndChunkReplica
     userId :: Int64,
     server :: XFTPServer,
     replicaId :: ChunkReplicaId,
-    replicaKey :: C.APrivateSignKey,
+    replicaKey :: C.APrivateAuthKey,
     chunkDigest :: FileDigest,
     delay :: Maybe Int64,
     retries :: Int
   }
-  deriving (Eq, Show)
+  deriving (Show)

src/Simplex/Messaging/Agent/Env/SQLite.hs

@@ -19,6 +19,7 @@ module Simplex.Messaging.Agent.Env.SQLite
     defaultAgentConfig,
     defaultReconnectInterval,
     tryAgentError,
+    tryAgentError',
     catchAgentError,
     agentFinally,
     Env (..),
@@ -27,9 +28,13 @@ module Simplex.Messaging.Agent.Env.SQLite
     NtfSupervisor (..),
     NtfSupervisorCommand (..),
     XFTPAgent (..),
+    Worker (..),
+    RestartCount (..),
+    updateRestartCount,
   )
 where
 
+import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Unlift
 import Control.Monad.Reader
@@ -39,6 +44,7 @@ import Data.Int (Int64)
 import Data.List.NonEmpty (NonEmpty)
 import Data.Map (Map)
 import Data.Time.Clock (NominalDiffTime, nominalDay)
+import Data.Time.Clock.System (SystemTime (..))
 import Data.Word (Word16)
 import Network.Socket
 import Numeric.Natural
@@ -50,15 +56,16 @@ import qualified Simplex.Messaging.Agent.Store.SQLite.Migrations as Migrations
 import Simplex.Messaging.Client
 import Simplex.Messaging.Client.Agent ()
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Crypto.Ratchet (supportedE2EEncryptVRange)
+import Simplex.Messaging.Crypto.Ratchet (PQSupport, VersionRangeE2E, supportedE2EEncryptVRange)
+import Simplex.Messaging.Notifications.Client (defaultNTFClientConfig)
+import Simplex.Messaging.Notifications.Transport (NTFVersion)
 import Simplex.Messaging.Notifications.Types
-import Simplex.Messaging.Protocol (NtfServer, XFTPServer, XFTPServerWithAuth, supportedSMPClientVRange)
+import Simplex.Messaging.Protocol (NtfServer, VersionRangeSMPC, XFTPServer, XFTPServerWithAuth, supportedSMPClientVRange)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Transport (TLS, Transport (..))
+import Simplex.Messaging.Transport (SMPVersion, TLS, Transport (..))
 import Simplex.Messaging.Transport.Client (defaultSMPPort)
 import Simplex.Messaging.Util (allFinally, catchAllErrors, tryAllErrors)
-import Simplex.Messaging.Version
 import System.Random (StdGen, newStdGen)
 import UnliftIO (Async, SomeException)
 import UnliftIO.STM
@@ -76,23 +83,29 @@ data InitialAgentServers = InitialAgentServers
 
 data AgentConfig = AgentConfig
   { tcpPort :: ServiceName,
-    cmdSignAlg :: C.SignAlg,
+    rcvAuthAlg :: C.AuthAlg,
+    sndAuthAlg :: C.AuthAlg,
     connIdBytes :: Int,
     tbqSize :: Natural,
-    smpCfg :: ProtocolClientConfig,
-    ntfCfg :: ProtocolClientConfig,
+    smpCfg :: ProtocolClientConfig SMPVersion,
+    ntfCfg :: ProtocolClientConfig NTFVersion,
     xftpCfg :: XFTPClientConfig,
     reconnectInterval :: RetryInterval,
     messageRetryInterval :: RetryInterval2,
     messageTimeout :: NominalDiffTime,
+    connDeleteDeliveryTimeout :: NominalDiffTime,
     helloTimeout :: NominalDiffTime,
+    quotaExceededTimeout :: NominalDiffTime,
     initialCleanupDelay :: Int64,
     cleanupInterval :: Int64,
     cleanupStepInterval :: Int,
+    maxWorkerRestartsPerMin :: Int,
+    maxSubscriptionTimeouts :: Int,
     storedMsgDataTTL :: NominalDiffTime,
     rcvFilesTTL :: NominalDiffTime,
     sndFilesTTL :: NominalDiffTime,
     xftpNotifyErrsOnRetry :: Bool,
+    xftpConsecutiveRetries :: Int,
     xftpMaxRecipientsPerRequest :: Int,
     deleteErrorCount :: Int,
     ntfCron :: Word16,
@@ -103,10 +116,9 @@ data AgentConfig = AgentConfig
     caCertificateFile :: FilePath,
     privateKeyFile :: FilePath,
     certificateFile :: FilePath,
-    e2eEncryptVRange :: VersionRange,
-    smpAgentVRange :: VersionRange,
-    smpClientVRange :: VersionRange,
-    initialClientId :: Int
+    e2eEncryptVRange :: PQSupport -> VersionRangeE2E,
+    smpAgentVRange :: PQSupport -> VersionRangeSMPA,
+    smpClientVRange :: VersionRangeSMPC
   }
 
 defaultReconnectInterval :: RetryInterval
@@ -127,13 +139,10 @@ defaultMessageRetryInterval =
             maxInterval = 60_000000
           },
       riSlow =
-        -- TODO: these timeouts can be increased in v5.0 once most clients are updated
-        -- to resume sending on QCONT messages.
-        -- After that local message expiration period should be also increased.
         RetryInterval
-          { initialInterval = 60_000000,
+          { initialInterval = 180_000000, -- 3 minutes
             increaseAfter = 60_000000,
-            maxInterval = 3600_000000 -- 1 hour
+            maxInterval = 3 * 3600_000000 -- 3 hours
           }
     }
 
@@ -141,23 +150,33 @@ defaultAgentConfig :: AgentConfig
 defaultAgentConfig =
   AgentConfig
     { tcpPort = "5224",
-      cmdSignAlg = C.SignAlg C.SEd448,
+      -- while the current client version supports X25519, it can only be enabled once support for SMP v6 is dropped,
+      -- and all servers are required to support v7 to be compatible.
+      rcvAuthAlg = C.AuthAlg C.SEd25519, -- this will stay as Ed25519
+      sndAuthAlg = C.AuthAlg C.SEd25519, -- TODO replace with X25519 when switching to v7
       connIdBytes = 12,
       tbqSize = 64,
-      smpCfg = defaultClientConfig {defaultTransport = (show defaultSMPPort, transport @TLS)},
-      ntfCfg = defaultClientConfig {defaultTransport = ("443", transport @TLS)},
+      smpCfg = defaultSMPClientConfig {defaultTransport = (show defaultSMPPort, transport @TLS)},
+      ntfCfg = defaultNTFClientConfig {defaultTransport = ("443", transport @TLS)},
       xftpCfg = defaultXFTPClientConfig,
       reconnectInterval = defaultReconnectInterval,
       messageRetryInterval = defaultMessageRetryInterval,
       messageTimeout = 2 * nominalDay,
+      connDeleteDeliveryTimeout = 2 * nominalDay,
       helloTimeout = 2 * nominalDay,
+      quotaExceededTimeout = 7 * nominalDay,
       initialCleanupDelay = 30 * 1000000, -- 30 seconds
       cleanupInterval = 30 * 60 * 1000000, -- 30 minutes
       cleanupStepInterval = 200000, -- 200ms
+      maxWorkerRestartsPerMin = 5,
+      -- 3 consecutive subscription timeouts will result in alert to the user
+      -- this is a fallback, as the timeout set to 3x of expected timeout, to avoid potential locking.
+      maxSubscriptionTimeouts = 3,
       storedMsgDataTTL = 21 * nominalDay,
       rcvFilesTTL = 2 * nominalDay,
       sndFilesTTL = nominalDay,
       xftpNotifyErrsOnRetry = True,
+      xftpConsecutiveRetries = 3,
       xftpMaxRecipientsPerRequest = 200,
       deleteErrorCount = 10,
       ntfCron = 20, -- minutes
@@ -172,15 +191,13 @@ defaultAgentConfig =
       certificateFile = "/etc/opt/simplex-agent/agent.crt",
       e2eEncryptVRange = supportedE2EEncryptVRange,
       smpAgentVRange = supportedSMPAgentVRange,
-      smpClientVRange = supportedSMPClientVRange,
-      initialClientId = 0
+      smpClientVRange = supportedSMPClientVRange
     }
 
 data Env = Env
   { config :: AgentConfig,
     store :: SQLiteStore,
     random :: TVar ChaChaDRG,
-    clientCounter :: TVar Int,
     randomServer :: TVar StdGen,
     ntfSupervisor :: NtfSupervisor,
     xftpAgent :: XFTPAgent,
@@ -188,14 +205,13 @@ data Env = Env
   }
 
 newSMPAgentEnv :: AgentConfig -> SQLiteStore -> IO Env
-newSMPAgentEnv config@AgentConfig {initialClientId} store = do
-  random <- newTVarIO =<< drgNew
-  clientCounter <- newTVarIO initialClientId
+newSMPAgentEnv config store = do
+  random <- C.newRandom
   randomServer <- newTVarIO =<< liftIO newStdGen
   ntfSupervisor <- atomically . newNtfSubSupervisor $ tbqSize config
   xftpAgent <- atomically newXFTPAgent
   multicastSubscribers <- newTMVarIO 0
-  pure Env {config, store, random, clientCounter, randomServer, ntfSupervisor, xftpAgent, multicastSubscribers}
+  pure Env {config, store, random, randomServer, ntfSupervisor, xftpAgent, multicastSubscribers}
 
 createAgentStore :: FilePath -> ScrubbedBytes -> Bool -> MigrationConfirmation -> IO (Either MigrationError SQLiteStore)
 createAgentStore dbFilePath dbKey keepKey = createSQLiteStore dbFilePath dbKey keepKey Migrations.app
@@ -203,8 +219,8 @@ createAgentStore dbFilePath dbKey keepKey = createSQLiteStore dbFilePath dbKey k
 data NtfSupervisor = NtfSupervisor
   { ntfTkn :: TVar (Maybe NtfToken),
     ntfSubQ :: TBQueue (ConnId, NtfSupervisorCommand),
-    ntfWorkers :: TMap NtfServer (TMVar (), Async ()),
-    ntfSMPWorkers :: TMap SMPServer (TMVar (), Async ())
+    ntfWorkers :: TMap NtfServer Worker,
+    ntfSMPWorkers :: TMap SMPServer Worker
   }
 
 data NtfSupervisorCommand = NSCCreate | NSCDelete | NSCSmpDelete | NSCNtfWorker NtfServer | NSCNtfSMPWorker SMPServer
@@ -221,9 +237,9 @@ newNtfSubSupervisor qSize = do
 data XFTPAgent = XFTPAgent
   { -- if set, XFTP file paths will be considered as relative to this directory
     xftpWorkDir :: TVar (Maybe FilePath),
-    xftpRcvWorkers :: TMap (Maybe XFTPServer) (TMVar (), Async ()),
-    xftpSndWorkers :: TMap (Maybe XFTPServer) (TMVar (), Async ()),
-    xftpDelWorkers :: TMap XFTPServer (TMVar (), Async ())
+    xftpRcvWorkers :: TMap (Maybe XFTPServer) Worker,
+    xftpSndWorkers :: TMap (Maybe XFTPServer) Worker,
+    xftpDelWorkers :: TMap XFTPServer Worker
   }
 
 newXFTPAgent :: STM XFTPAgent
@@ -238,6 +254,11 @@ tryAgentError :: AgentMonad m => m a -> m (Either AgentErrorType a)
 tryAgentError = tryAllErrors mkInternal
 {-# INLINE tryAgentError #-}
 
+-- unlike runExceptT, this ensures we catch IO exceptions as well
+tryAgentError' :: AgentMonad' m => ExceptT AgentErrorType m a -> m (Either AgentErrorType a)
+tryAgentError' = fmap join . runExceptT . tryAgentError
+{-# INLINE tryAgentError' #-}
+
 catchAgentError :: AgentMonad m => m a -> (AgentErrorType -> m a) -> m a
 catchAgentError = catchAllErrors mkInternal
 {-# INLINE catchAgentError #-}
@@ -249,3 +270,20 @@ agentFinally = allFinally mkInternal
 mkInternal :: SomeException -> AgentErrorType
 mkInternal = INTERNAL . show
 {-# INLINE mkInternal #-}
+
+data Worker = Worker
+  { workerId :: Int,
+    doWork :: TMVar (),
+    action :: TMVar (Maybe (Async ())),
+    restarts :: TVar RestartCount
+  }
+
+data RestartCount = RestartCount
+  { restartMinute :: Int64,
+    restartCount :: Int
+  }
+
+updateRestartCount :: SystemTime -> RestartCount -> RestartCount
+updateRestartCount t (RestartCount minute count) = do
+  let min' = systemSeconds t `div` 60
+   in RestartCount min' $ if minute == min' then count + 1 else 1

src/Simplex/Messaging/Agent/Lock.hs

@@ -1,8 +1,18 @@
-module Simplex.Messaging.Agent.Lock where
+{-# LANGUAGE NamedFieldPuns #-}
+
+module Simplex.Messaging.Agent.Lock
+  ( Lock,
+    createLock,
+    withLock,
+    withGetLock,
+    withGetLocks,
+  )
+where
 
 import Control.Monad (void)
 import Control.Monad.IO.Unlift
 import Data.Functor (($>))
+import UnliftIO.Async (forConcurrently)
 import qualified UnliftIO.Exception as E
 import UnliftIO.STM
 
@@ -18,9 +28,22 @@ withLock lock name =
     (atomically $ putTMVar lock name)
     (void . atomically $ takeTMVar lock)
 
-withGetLock :: MonadUnliftIO m => STM Lock -> String -> m a -> m a
-withGetLock getLock name a =
+withGetLock :: MonadUnliftIO m => (k -> STM Lock) -> k -> String -> m a -> m a
+withGetLock getLock key name a =
   E.bracket
-    (atomically $ getLock >>= \l -> putTMVar l name $> l)
+    (atomically $ getPutLock getLock key name)
     (atomically . takeTMVar)
     (const a)
+
+withGetLocks :: MonadUnliftIO m => (k -> STM Lock) -> [k] -> String -> m a -> m a
+withGetLocks getLock keys name = E.bracket holdLocks releaseLocks . const
+  where
+    holdLocks = forConcurrently keys $ \key -> atomically $ getPutLock getLock key name
+    -- only this withGetLocks would be holding the locks,
+    -- so it's safe to combine all lock releases into one transaction
+    releaseLocks = atomically . mapM_ takeTMVar
+
+-- getLock and putTMVar can be in one transaction on the assumption that getLock doesn't write in case the lock already exists,
+-- and in case it is created and added to some shared resource (we use TMap) it also helps avoid contention for the newly created lock.
+getPutLock :: (k -> STM Lock) -> k -> String -> STM Lock
+getPutLock getLock key name = getLock key >>= \l -> putTMVar l name $> l

src/Simplex/Messaging/Agent/NtfSubSupervisor.hs

@@ -37,9 +37,7 @@ import Simplex.Messaging.Client.Agent ()
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol (NtfSubStatus (..), NtfTknStatus (..), SMPQueueNtf (..))
 import Simplex.Messaging.Notifications.Types
-import Simplex.Messaging.Protocol (NtfServer, ProtocolServer, SMPServer, sameSrvAddr)
-import Simplex.Messaging.TMap (TMap)
-import qualified Simplex.Messaging.TMap as TM
+import Simplex.Messaging.Protocol (NtfServer, SMPServer, sameSrvAddr)
 import Simplex.Messaging.Util (diffToMicroseconds, threadDelay', tshow, unlessM)
 import System.Random (randomR)
 import UnliftIO
@@ -74,16 +72,16 @@ processNtfSub c (connId, cmd) = do
       logInfo $ "processNtfSub, NSCCreate - a = " <> tshow a
       case a of
         Nothing -> do
-          withNtfServer c $ \ntfServer -> do
+          withTokenServer $ \ntfServer -> do
             case clientNtfCreds of
               Just ClientNtfCreds {notifierId} -> do
                 let newSub = newNtfSubscription connId smpServer (Just notifierId) ntfServer NASKey
                 withStore c $ \db -> createNtfSubscription db newSub $ NtfSubNTFAction NSACreate
-                addNtfNTFWorker ntfServer
+                void $ getNtfNTFWorker True c ntfServer
               Nothing -> do
                 let newSub = newNtfSubscription connId smpServer Nothing ntfServer NASNew
                 withStore c $ \db -> createNtfSubscription db newSub $ NtfSubSMPAction NSASmpKey
-                addNtfSMPWorker smpServer
+                void $ getNtfSMPWorker True c smpServer
         (Just (sub@NtfSubscription {ntfSubStatus, ntfServer = subNtfServer, smpServer = smpServer', ntfQueueId}, action_)) -> do
           case (clientNtfCreds, ntfQueueId) of
             (Just ClientNtfCreds {notifierId}, Just ntfQueueId')
@@ -101,82 +99,72 @@ processNtfSub c (connId, cmd) = do
                 | isDeleteNtfSubAction action -> do
                     if ntfSubStatus == NASNew || ntfSubStatus == NASOff || ntfSubStatus == NASDeleted
                       then resetSubscription
-                      else withNtfServer c $ \ntfServer -> do
+                      else withTokenServer $ \ntfServer -> do
                         withStore' c $ \db -> supervisorUpdateNtfSub db sub {ntfServer} (NtfSubNTFAction NSACreate)
-                        addNtfNTFWorker ntfServer
+                        void $ getNtfNTFWorker True c ntfServer
                 | otherwise -> case action of
-                    NtfSubNTFAction _ -> addNtfNTFWorker subNtfServer
-                    NtfSubSMPAction _ -> addNtfSMPWorker smpServer
+                    NtfSubNTFAction _ -> void $ getNtfNTFWorker True c subNtfServer
+                    NtfSubSMPAction _ -> void $ getNtfSMPWorker True c smpServer
             rotate :: m ()
             rotate = do
               withStore' c $ \db -> supervisorUpdateNtfSub db sub (NtfSubNTFAction NSARotate)
-              addNtfNTFWorker subNtfServer
+              void $ getNtfNTFWorker True c subNtfServer
             resetSubscription :: m ()
             resetSubscription =
-              withNtfServer c $ \ntfServer -> do
+              withTokenServer $ \ntfServer -> do
                 let sub' = sub {ntfQueueId = Nothing, ntfServer, ntfSubId = Nothing, ntfSubStatus = NASNew}
                 withStore' c $ \db -> supervisorUpdateNtfSub db sub' (NtfSubSMPAction NSASmpKey)
-                addNtfSMPWorker smpServer
+                void $ getNtfSMPWorker True c smpServer
     NSCDelete -> do
       sub_ <- withStore' c $ \db -> do
         supervisorUpdateNtfAction db connId (NtfSubNTFAction NSADelete)
         getNtfSubscription db connId
       logInfo $ "processNtfSub, NSCDelete - sub_ = " <> tshow sub_
       case sub_ of
-        (Just (NtfSubscription {ntfServer}, _)) -> addNtfNTFWorker ntfServer
+        (Just (NtfSubscription {ntfServer}, _)) -> void $ getNtfNTFWorker True c ntfServer
         _ -> pure () -- err "NSCDelete - no subscription"
     NSCSmpDelete -> do
       withStore' c (`getPrimaryRcvQueue` connId) >>= \case
         Right rq@RcvQueue {server = smpServer} -> do
           logInfo $ "processNtfSub, NSCSmpDelete - rq = " <> tshow rq
           withStore' c $ \db -> supervisorUpdateNtfAction db connId (NtfSubSMPAction NSASmpDelete)
-          addNtfSMPWorker smpServer
+          void $ getNtfSMPWorker True c smpServer
         _ -> notifyInternalError c connId "NSCSmpDelete - no rcv queue"
-    NSCNtfWorker ntfServer -> addNtfNTFWorker ntfServer
-    NSCNtfSMPWorker smpServer -> addNtfSMPWorker smpServer
-  where
-    addNtfNTFWorker = addWorker ntfWorkers runNtfWorker
-    addNtfSMPWorker = addWorker ntfSMPWorkers runNtfSMPWorker
-    addWorker ::
-      (NtfSupervisor -> TMap (ProtocolServer s) (TMVar (), Async ())) ->
-      (AgentClient -> ProtocolServer s -> TMVar () -> m ()) ->
-      ProtocolServer s ->
-      m ()
-    addWorker wsSel runWorker srv = do
-      ws <- asks $ wsSel . ntfSupervisor
-      atomically (TM.lookup srv ws) >>= \case
-        Nothing -> do
-          doWork <- newTMVarIO ()
-          worker <- async $ runWorker c srv doWork `agentFinally` atomically (TM.delete srv ws)
-          atomically $ TM.insert srv (doWork, worker) ws
-        Just (doWork, _) ->
-          void . atomically $ tryPutTMVar doWork ()
+    NSCNtfWorker ntfServer -> void $ getNtfNTFWorker True c ntfServer
+    NSCNtfSMPWorker smpServer -> void $ getNtfSMPWorker True c smpServer
 
-withNtfServer :: AgentMonad' m => AgentClient -> (NtfServer -> m ()) -> m ()
-withNtfServer c action = getNtfServer c >>= mapM_ action
+getNtfNTFWorker :: AgentMonad' m => Bool -> AgentClient -> NtfServer -> m Worker
+getNtfNTFWorker hasWork c server = do
+  ws <- asks $ ntfWorkers . ntfSupervisor
+  getAgentWorker "ntf_ntf" hasWork c server ws $ runNtfWorker c server
 
-runNtfWorker :: forall m. AgentMonad m => AgentClient -> NtfServer -> TMVar () -> m ()
-runNtfWorker c srv doWork = do
+getNtfSMPWorker :: AgentMonad' m => Bool -> AgentClient -> SMPServer -> m Worker
+getNtfSMPWorker hasWork c server = do
+  ws <- asks $ ntfSMPWorkers . ntfSupervisor
+  getAgentWorker "ntf_smp" hasWork c server ws $ runNtfSMPWorker c server
+
+withTokenServer :: AgentMonad' m => (NtfServer -> m ()) -> m ()
+withTokenServer action = getNtfToken >>= mapM_ (\NtfToken {ntfServer} -> action ntfServer)
+
+runNtfWorker :: forall m. AgentMonad m => AgentClient -> NtfServer -> Worker -> m ()
+runNtfWorker c srv Worker {doWork} = do
   delay <- asks $ ntfWorkerDelay . config
   forever $ do
-    void . atomically $ readTMVar doWork
+    waitForWork doWork
     agentOperationBracket c AONtfNetwork throwWhenInactive runNtfOperation
     threadDelay delay
   where
     runNtfOperation :: m ()
-    runNtfOperation = do
-      nextSub_ <- withStore' c (`getNextNtfSubNTFAction` srv)
-      logInfo $ "runNtfWorker, nextSub_ " <> tshow nextSub_
-      case nextSub_ of
-        Nothing -> noWorkToDo
-        Just a@(NtfSubscription {connId}, _, _) -> do
+    runNtfOperation =
+      withWork c doWork (`getNextNtfSubNTFAction` srv) $
+        \nextSub@(NtfSubscription {connId}, _, _) -> do
+          logInfo $ "runNtfWorker, nextSub " <> tshow nextSub
           ri <- asks $ reconnectInterval . config
           withRetryInterval ri $ \_ loop ->
-            processAction a
+            processSub nextSub
               `catchAgentError` retryOnError c "NtfWorker" loop (workerInternalError c connId . show)
-    noWorkToDo = void . atomically $ tryTakeTMVar doWork
-    processAction :: (NtfSubscription, NtfSubNTFAction, NtfActionTs) -> m ()
-    processAction (sub@NtfSubscription {connId, smpServer, ntfSubId}, action, actionTs) = do
+    processSub :: (NtfSubscription, NtfSubNTFAction, NtfActionTs) -> m ()
+    processSub (sub@NtfSubscription {connId, smpServer, ntfSubId}, action, actionTs) = do
       ts <- liftIO getCurrentTime
       unlessM (rescheduleAction doWork ts actionTs) $
         case action of
@@ -240,27 +228,24 @@ runNtfWorker c srv doWork = do
           withStore' c $ \db ->
             updateNtfSubscription db sub {ntfSubStatus = toStatus} toAction actionTs'
 
-runNtfSMPWorker :: forall m. AgentMonad m => AgentClient -> SMPServer -> TMVar () -> m ()
-runNtfSMPWorker c srv doWork = do
+runNtfSMPWorker :: forall m. AgentMonad m => AgentClient -> SMPServer -> Worker -> m ()
+runNtfSMPWorker c srv Worker {doWork} = do
   delay <- asks $ ntfSMPWorkerDelay . config
   forever $ do
-    void . atomically $ readTMVar doWork
+    waitForWork doWork
     agentOperationBracket c AONtfNetwork throwWhenInactive runNtfSMPOperation
     threadDelay delay
   where
-    runNtfSMPOperation = do
-      nextSub_ <- withStore' c (`getNextNtfSubSMPAction` srv)
-      logInfo $ "runNtfSMPWorker, nextSub_ " <> tshow nextSub_
-      case nextSub_ of
-        Nothing -> noWorkToDo
-        Just a@(NtfSubscription {connId}, _, _) -> do
+    runNtfSMPOperation =
+      withWork c doWork (`getNextNtfSubSMPAction` srv) $
+        \nextSub@(NtfSubscription {connId}, _, _) -> do
+          logInfo $ "runNtfSMPWorker, nextSub " <> tshow nextSub
           ri <- asks $ reconnectInterval . config
           withRetryInterval ri $ \_ loop ->
-            processAction a
+            processSub nextSub
               `catchAgentError` retryOnError c "NtfSMPWorker" loop (workerInternalError c connId . show)
-    noWorkToDo = void . atomically $ tryTakeTMVar doWork
-    processAction :: (NtfSubscription, NtfSubSMPAction, NtfActionTs) -> m ()
-    processAction (sub@NtfSubscription {connId, ntfServer}, smpAction, actionTs) = do
+    processSub :: (NtfSubscription, NtfSubSMPAction, NtfActionTs) -> m ()
+    processSub (sub@NtfSubscription {connId, ntfServer}, smpAction, actionTs) = do
       ts <- liftIO getCurrentTime
       unlessM (rescheduleAction doWork ts actionTs) $
         case smpAction of
@@ -268,9 +253,10 @@ runNtfSMPWorker c srv doWork = do
             getNtfToken >>= \case
               Just NtfToken {ntfTknStatus = NTActive, ntfMode = NMInstant} -> do
                 rq <- withStore c (`getPrimaryRcvQueue` connId)
-                C.SignAlg a <- asks (cmdSignAlg . config)
-                (ntfPublicKey, ntfPrivateKey) <- liftIO $ C.generateSignatureKeyPair a
-                (rcvNtfPubDhKey, rcvNtfPrivDhKey) <- liftIO C.generateKeyPair'
+                C.AuthAlg a <- asks (rcvAuthAlg . config)
+                g <- asks random
+                (ntfPublicKey, ntfPrivateKey) <- atomically $ C.generateAuthKeyPair a g
+                (rcvNtfPubDhKey, rcvNtfPrivDhKey) <- atomically $ C.generateKeyPair g
                 (notifierId, rcvNtfSrvPubDhKey) <- enableQueueNotifications c rq ntfPublicKey rcvNtfPubDhKey
                 let rcvNtfDhSecret = C.dh' rcvNtfSrvPubDhKey rcvNtfPrivDhKey
                 withStore' c $ \db -> do
@@ -293,7 +279,7 @@ rescheduleAction doWork ts actionTs
       void . atomically $ tryTakeTMVar doWork
       void . forkIO $ do
         liftIO $ threadDelay' $ diffToMicroseconds $ diffUTCTime actionTs ts
-        void . atomically $ tryPutTMVar doWork ()
+        atomically $ hasWorkToDo' doWork
       pure True
 
 retryOnError :: AgentMonad' m => AgentClient -> Text -> m () -> (AgentErrorType -> m ()) -> AgentErrorType -> m ()
@@ -342,13 +328,10 @@ instantNotifications = \case
 
 closeNtfSupervisor :: MonadUnliftIO m => NtfSupervisor -> m ()
 closeNtfSupervisor ns = do
-  cancelNtfWorkers_ $ ntfWorkers ns
-  cancelNtfWorkers_ $ ntfSMPWorkers ns
-
-cancelNtfWorkers_ :: MonadUnliftIO m => TMap (ProtocolServer s) (TMVar (), Async ()) -> m ()
-cancelNtfWorkers_ wsVar = do
-  ws <- atomically $ stateTVar wsVar (,M.empty)
-  mapM_ (uninterruptibleCancel . snd) ws
+  stopWorkers $ ntfWorkers ns
+  stopWorkers $ ntfSMPWorkers ns
+  where
+    stopWorkers workers = atomically (swapTVar workers M.empty) >>= mapM_ (liftIO . cancelWorker)
 
 getNtfServer :: AgentMonad' m => AgentClient -> m (Maybe NtfServer)
 getNtfServer c = do

src/Simplex/Messaging/Agent/Protocol.hs

@@ -4,6 +4,7 @@
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
@@ -33,6 +34,14 @@
 -- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/agent-protocol.md
 module Simplex.Messaging.Agent.Protocol
   ( -- * Protocol parameters
+    VersionSMPA,
+    VersionRangeSMPA,
+    pattern VersionSMPA,
+    duplexHandshakeSMPAgentVersion,
+    ratchetSyncSMPAgentVersion,
+    deliveryRcptsSMPAgentVersion,
+    pqdrSMPAgentVersion,
+    currentSMPAgentVersion,
     supportedSMPAgentVRange,
     e2eEncConnInfoLength,
     e2eEncUserMsgLength,
@@ -97,7 +106,7 @@ module Simplex.Messaging.Agent.Protocol
     AConnectionRequestUri (..),
     ConnReqUriData (..),
     CRClientData,
-    ConnReqScheme (..),
+    ServiceScheme,
     simplexChat,
     AgentErrorType (..),
     CommandErrorType (..),
@@ -164,7 +173,7 @@ import Data.List.NonEmpty (NonEmpty (..))
 import qualified Data.List.NonEmpty as L
 import Data.Map (Map)
 import qualified Data.Map as M
-import Data.Maybe (isJust)
+import Data.Maybe (fromMaybe, isJust)
 import Data.Text (Text)
 import qualified Data.Text as T
 import Data.Text.Encoding (decodeLatin1, encodeUtf8)
@@ -173,14 +182,25 @@ import Data.Time.Clock.System (SystemTime)
 import Data.Time.ISO8601
 import Data.Type.Equality
 import Data.Typeable ()
-import Data.Word (Word32)
+import Data.Word (Word16, Word32)
 import Database.SQLite.Simple.FromField
 import Database.SQLite.Simple.ToField
 import Simplex.FileTransfer.Description
-import Simplex.FileTransfer.Protocol (FileParty (..), XFTPErrorType)
+import Simplex.FileTransfer.Protocol (FileParty (..))
+import Simplex.FileTransfer.Transport (XFTPErrorType)
 import Simplex.Messaging.Agent.QueryString
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Crypto.Ratchet (E2ERatchetParams, E2ERatchetParamsUri)
+import Simplex.Messaging.Crypto.Ratchet
+  ( InitialKeys (..),
+    PQEncryption (..),
+    pattern PQEncOff,
+    PQSupport,
+    pattern PQSupportOn,
+    pattern PQSupportOff,
+    RcvE2ERatchetParams,
+    RcvE2ERatchetParamsUri,
+    SndE2ERatchetParams
+  )
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers
@@ -196,40 +216,87 @@ import Simplex.Messaging.Protocol
     SMPMsgMeta,
     SMPServer,
     SMPServerWithAuth,
-    SndPublicVerifyKey,
-    SrvLoc (..),
+    SndPublicAuthKey,
     SubscriptionMode,
+    SMPClientVersion,
+    VersionSMPC,
+    VersionRangeSMPC,
+    initialSMPClientVersion,
     legacyEncodeServer,
     legacyServerP,
     legacyStrEncodeServer,
     noAuthSrv,
     sameSrvAddr,
+    srvHostnamesSMPClientVersion,
     pattern ProtoServerWithAuth,
     pattern SMPServer,
   )
 import qualified Simplex.Messaging.Protocol as SMP
+import Simplex.Messaging.ServiceScheme
 import Simplex.Messaging.Transport (Transport (..), TransportError, serializeTransportError, transportErrorP)
 import Simplex.Messaging.Transport.Client (TransportHost, TransportHosts_ (..))
 import Simplex.Messaging.Util
 import Simplex.Messaging.Version
+import Simplex.Messaging.Version.Internal
 import Simplex.RemoteControl.Types
 import Text.Read
 import UnliftIO.Exception (Exception)
 
-currentSMPAgentVersion :: Version
-currentSMPAgentVersion = 4
+-- SMP agent protocol version history:
+-- 1 - binary protocol encoding (1/1/2022)
+-- 2 - "duplex" (more efficient) connection handshake (6/9/2022)
+-- 3 - support ratchet renegotiation (6/30/2023)
+-- 4 - delivery receipts (7/13/2023)
+-- 5 - post-quantum double ratchet (3/14/2024)
 
-supportedSMPAgentVRange :: VersionRange
-supportedSMPAgentVRange = mkVersionRange 1 currentSMPAgentVersion
+data SMPAgentVersion
+
+instance VersionScope SMPAgentVersion
+
+type VersionSMPA = Version SMPAgentVersion
+
+type VersionRangeSMPA = VersionRange SMPAgentVersion
+
+pattern VersionSMPA :: Word16 -> VersionSMPA
+pattern VersionSMPA v = Version v
+
+duplexHandshakeSMPAgentVersion :: VersionSMPA
+duplexHandshakeSMPAgentVersion = VersionSMPA 2
+
+ratchetSyncSMPAgentVersion :: VersionSMPA
+ratchetSyncSMPAgentVersion = VersionSMPA 3
+
+deliveryRcptsSMPAgentVersion :: VersionSMPA
+deliveryRcptsSMPAgentVersion = VersionSMPA 4
+
+pqdrSMPAgentVersion :: VersionSMPA
+pqdrSMPAgentVersion = VersionSMPA 5
+
+-- TODO v5.7 increase to 5
+currentSMPAgentVersion :: VersionSMPA
+currentSMPAgentVersion = VersionSMPA 4
+
+-- TODO v5.7 remove dependency of version range on whether PQ support is needed
+supportedSMPAgentVRange :: PQSupport -> VersionRangeSMPA
+supportedSMPAgentVRange pq =
+  mkVersionRange duplexHandshakeSMPAgentVersion $ case pq of
+    PQSupportOn -> pqdrSMPAgentVersion
+    PQSupportOff -> currentSMPAgentVersion
 
 -- it is shorter to allow all handshake headers,
 -- including E2E (double-ratchet) parameters and
 -- signing key of the sender for the server
-e2eEncConnInfoLength :: Int
-e2eEncConnInfoLength = 14848
+e2eEncConnInfoLength :: VersionSMPA -> PQSupport -> Int
+e2eEncConnInfoLength v = \case
+  -- reduced by 3726 (roughly the increase of message ratchet header size + key and ciphertext in reply link)
+  PQSupportOn | v >= pqdrSMPAgentVersion -> 11122
+  _ -> 14848
 
-e2eEncUserMsgLength :: Int
-e2eEncUserMsgLength = 15856
+e2eEncUserMsgLength :: VersionSMPA -> PQSupport -> Int
+e2eEncUserMsgLength v = \case
+  -- reduced by 2222 (the increase of message ratchet header size)
+  PQSupportOn | v >= pqdrSMPAgentVersion -> 13634
+  _ -> 15856
 
 -- | Raw (unparsed) SMP agent protocol transmission.
 type ARawTransmission = (ByteString, ByteString, ByteString)
@@ -255,8 +322,6 @@ data SAParty :: AParty -> Type where
 
 deriving instance Show (SAParty p)
 
-deriving instance Eq (SAParty p)
-
 instance TestEquality SAParty where
   testEquality SAgent SAgent = Just Refl
   testEquality SClient SClient = Just Refl
@@ -279,8 +344,6 @@ data SAEntity :: AEntity -> Type where
 
 deriving instance Show (SAEntity e)
 
-deriving instance Eq (SAEntity e)
-
 instance TestEquality SAEntity where
   testEquality SAEConn SAEConn = Just Refl
   testEquality SAERcvFile SAERcvFile = Just Refl
@@ -315,16 +378,16 @@ type ConnInfo = ByteString
 
 -- | Parameterized type for SMP agent protocol commands and responses from all participants.
 data ACommand (p :: AParty) (e :: AEntity) where
-  NEW :: Bool -> AConnectionMode -> SubscriptionMode -> ACommand Client AEConn -- response INV
+  NEW :: Bool -> AConnectionMode -> InitialKeys -> SubscriptionMode -> ACommand Client AEConn -- response INV
   INV :: AConnectionRequestUri -> ACommand Agent AEConn
-  JOIN :: Bool -> AConnectionRequestUri -> SubscriptionMode -> ConnInfo -> ACommand Client AEConn -- response OK
-  CONF :: ConfirmationId -> [SMPServer] -> ConnInfo -> ACommand Agent AEConn -- ConnInfo is from sender, [SMPServer] will be empty only in v1 handshake
+  JOIN :: Bool -> AConnectionRequestUri -> PQSupport -> SubscriptionMode -> ConnInfo -> ACommand Client AEConn -- response OK
+  CONF :: ConfirmationId -> PQSupport -> [SMPServer] -> ConnInfo -> ACommand Agent AEConn -- ConnInfo is from sender, [SMPServer] will be empty only in v1 handshake
   LET :: ConfirmationId -> ConnInfo -> ACommand Client AEConn -- ConnInfo is from client
-  REQ :: InvitationId -> NonEmpty SMPServer -> ConnInfo -> ACommand Agent AEConn -- ConnInfo is from sender
-  ACPT :: InvitationId -> ConnInfo -> ACommand Client AEConn -- ConnInfo is from client
+  REQ :: InvitationId -> PQSupport -> NonEmpty SMPServer -> ConnInfo -> ACommand Agent AEConn -- ConnInfo is from sender
+  ACPT :: InvitationId -> PQSupport -> ConnInfo -> ACommand Client AEConn -- ConnInfo is from client
   RJCT :: InvitationId -> ACommand Client AEConn
-  INFO :: ConnInfo -> ACommand Agent AEConn
-  CON :: ACommand Agent AEConn -- notification that connection is established
+  INFO :: PQSupport -> ConnInfo -> ACommand Agent AEConn
+  CON :: PQEncryption -> ACommand Agent AEConn -- notification that connection is established
   SUB :: ACommand Client AEConn
   END :: ACommand Agent AEConn
   CONNECT :: AProtocolType -> TransportHost -> ACommand Agent AENone
@@ -333,10 +396,11 @@ data ACommand (p :: AParty) (e :: AEntity) where
   UP :: SMPServer -> [ConnId] -> ACommand Agent AENone
   SWITCH :: QueueDirection -> SwitchPhase -> ConnectionStats -> ACommand Agent AEConn
   RSYNC :: RatchetSyncState -> Maybe AgentCryptoError -> ConnectionStats -> ACommand Agent AEConn
-  SEND :: MsgFlags -> MsgBody -> ACommand Client AEConn
-  MID :: AgentMsgId -> ACommand Agent AEConn
+  SEND :: PQEncryption -> MsgFlags -> MsgBody -> ACommand Client AEConn
+  MID :: AgentMsgId -> PQEncryption -> ACommand Agent AEConn
   SENT :: AgentMsgId -> ACommand Agent AEConn
   MERR :: AgentMsgId -> AgentErrorType -> ACommand Agent AEConn
+  MERRS :: NonEmpty AgentMsgId -> AgentErrorType -> ACommand Agent AEConn
   MSG :: MsgMeta -> MsgFlags -> MsgBody -> ACommand Agent AEConn
   MSGNTF :: SMPMsgMeta -> ACommand Agent AEConn
   ACK :: AgentMsgId -> Maybe MsgReceiptInfo -> ACommand Client AEConn
@@ -398,6 +462,7 @@ data ACommandTag (p :: AParty) (e :: AEntity) where
   MID_ :: ACommandTag Agent AEConn
   SENT_ :: ACommandTag Agent AEConn
   MERR_ :: ACommandTag Agent AEConn
+  MERRS_ :: ACommandTag Agent AEConn
   MSG_ :: ACommandTag Agent AEConn
   MSGNTF_ :: ACommandTag Agent AEConn
   ACK_ :: ACommandTag Client AEConn
@@ -438,8 +503,8 @@ aCommandTag = \case
   REQ {} -> REQ_
   ACPT {} -> ACPT_
   RJCT _ -> RJCT_
-  INFO _ -> INFO_
-  CON -> CON_
+  INFO {} -> INFO_
+  CON _ -> CON_
   SUB -> SUB_
   END -> END_
   CONNECT {} -> CONNECT_
@@ -449,9 +514,10 @@ aCommandTag = \case
   SWITCH {} -> SWITCH_
   RSYNC {} -> RSYNC_
   SEND {} -> SEND_
-  MID _ -> MID_
+  MID {} -> MID_
   SENT _ -> SENT_
   MERR {} -> MERR_
+  MERRS {} -> MERRS_
   MSG {} -> MSG_
   MSGNTF {} -> MSGNTF_
   ACK {} -> ACK_
@@ -644,7 +710,7 @@ instance StrEncoding SndQueueInfo where
     pure SndQueueInfo {sndServer, sndSwitchStatus}
 
 data ConnectionStats = ConnectionStats
-  { connAgentVersion :: Version,
+  { connAgentVersion :: VersionSMPA,
     rcvQueuesInfo :: [RcvQueueInfo],
     sndQueuesInfo :: [SndQueueInfo],
     ratchetSyncState :: RatchetSyncState,
@@ -748,17 +814,19 @@ data MsgMeta = MsgMeta
   { integrity :: MsgIntegrity,
     recipient :: (AgentMsgId, UTCTime),
     broker :: (MsgId, UTCTime),
-    sndMsgId :: AgentMsgId
+    sndMsgId :: AgentMsgId,
+    pqEncryption :: PQEncryption
   }
   deriving (Eq, Show)
 
 instance StrEncoding MsgMeta where
-  strEncode MsgMeta {integrity, recipient = (rmId, rTs), broker = (bmId, bTs), sndMsgId} =
+  strEncode MsgMeta {integrity, recipient = (rmId, rTs), broker = (bmId, bTs), sndMsgId, pqEncryption} =
     B.unwords
       [ strEncode integrity,
         "R=" <> bshow rmId <> "," <> showTs rTs,
         "B=" <> encode bmId <> "," <> showTs bTs,
-        "S=" <> bshow sndMsgId
+        "S=" <> bshow sndMsgId,
+        "PQ=" <> strEncode pqEncryption
       ]
     where
       showTs = B.pack . formatISO8601Millis
@@ -767,13 +835,14 @@ instance StrEncoding MsgMeta where
     recipient <- " R=" *> partyMeta A.decimal
     broker <- " B=" *> partyMeta base64P
     sndMsgId <- " S=" *> A.decimal
-    pure MsgMeta {integrity, recipient, broker, sndMsgId}
+    pqEncryption <- " PQ=" *> strP
+    pure MsgMeta {integrity, recipient, broker, sndMsgId, pqEncryption}
     where
       partyMeta idParser = (,) <$> idParser <* A.char ',' <*> tsISO8601P
 
 data SMPConfirmation = SMPConfirmation
   { -- | sender's public key to use for authentication of sender's commands at the recepient's server
-    senderKey :: SndPublicVerifyKey,
+    senderKey :: SndPublicAuthKey,
     -- | sender's DH public key for simple per-queue e2e encryption
     e2ePubKey :: C.PublicKeyX25519,
     -- | sender's information to be associated with the connection, e.g. sender's profile information
@@ -781,28 +850,28 @@ data SMPConfirmation = SMPConfirmation
     -- | optional reply queues included in confirmation (added in agent protocol v2)
     smpReplyQueues :: [SMPQueueInfo],
     -- | SMP client version
-    smpClientVersion :: Version
+    smpClientVersion :: VersionSMPC
   }
   deriving (Show)
 
 data AgentMsgEnvelope
   = AgentConfirmation
-      { agentVersion :: Version,
-        e2eEncryption_ :: Maybe (E2ERatchetParams 'C.X448),
+      { agentVersion :: VersionSMPA,
+        e2eEncryption_ :: Maybe (SndE2ERatchetParams 'C.X448),
         encConnInfo :: ByteString
       }
   | AgentMsgEnvelope
-      { agentVersion :: Version,
+      { agentVersion :: VersionSMPA,
         encAgentMessage :: ByteString
       }
   | AgentInvitation -- the connInfo in contactInvite is only encrypted with per-queue E2E, not with double ratchet,
-      { agentVersion :: Version,
+      { agentVersion :: VersionSMPA,
         connReq :: ConnectionRequestUri 'CMInvitation,
         connInfo :: ByteString -- this message is only encrypted with per-queue E2E, not with double ratchet,
       }
   | AgentRatchetKey
-      { agentVersion :: Version,
-        e2eEncryption :: E2ERatchetParams 'C.X448,
+      { agentVersion :: VersionSMPA,
+        e2eEncryption :: RcvE2ERatchetParams 'C.X448,
         info :: ByteString
       }
   deriving (Show)
@@ -840,9 +909,10 @@ instance Encoding AgentMsgEnvelope where
 -- or in case of AgentInvitation - in plain text body)
 -- AgentRatchetInfo is not encrypted with double ratchet, but with per-queue E2E encryption
 data AgentMessage
-  = AgentConnInfo ConnInfo
-  | -- AgentConnInfoReply is only used in duplexHandshake mode (v2), allowing to include reply queue(s) in the initial confirmation.
-    -- It makes REPLY message unnecessary.
+  = -- used by the initiating party when confirming reply queue
+  AgentConnInfo ConnInfo
+  | -- AgentConnInfoReply is used by accepting party in duplexHandshake mode (v2), allowing to include reply queue(s) in the initial confirmation.
+    -- It made removed REPLY message unnecessary.
     AgentConnInfoReply (NonEmpty SMPQueueInfo) ConnInfo
   | AgentRatchetInfo ByteString
   | AgentMessage APrivHeader AMessage
@@ -924,8 +994,6 @@ agentMessageType = \case
     --   until the queue is secured - the OK response from the server instead of initial AUTH errors confirms it.
     -- - in v2 duplexHandshake it is sent only once, when it is known that the queue was secured.
     HELLO -> AM_HELLO_
-    -- REPLY is only used in v1
-    REPLY _ -> AM_REPLY_
     A_MSG _ -> AM_A_MSG_
     A_RCVD {} -> AM_A_RCVD_
     QCONT _ -> AM_QCONT_
@@ -950,7 +1018,6 @@ instance Encoding APrivHeader where
 
 data AMsgType
   = HELLO_
-  | REPLY_
   | A_MSG_
   | A_RCVD_
   | QCONT_
@@ -964,7 +1031,6 @@ data AMsgType
 instance Encoding AMsgType where
   smpEncode = \case
     HELLO_ -> "H"
-    REPLY_ -> "R"
     A_MSG_ -> "M"
     A_RCVD_ -> "V"
     QCONT_ -> "QC"
@@ -976,7 +1042,6 @@ instance Encoding AMsgType where
   smpP =
     A.anyChar >>= \case
       'H' -> pure HELLO_
-      'R' -> pure REPLY_
       'M' -> pure A_MSG_
       'V' -> pure A_RCVD_
       'Q' ->
@@ -996,8 +1061,6 @@ instance Encoding AMsgType where
 data AMessage
   = -- | the first message in the queue to validate it is secured
     HELLO
-  | -- | reply queues information
-    REPLY (NonEmpty SMPQueueInfo)
   | -- | agent envelope for the client message
     A_MSG MsgBody
   | -- | agent envelope for delivery receipt
@@ -1007,7 +1070,7 @@ data AMessage
   | -- add queue to connection (sent by recipient), with optional address of the replaced queue
     QADD (NonEmpty (SMPQueueUri, Maybe SndQAddr))
   | -- key to secure the added queues and agree e2e encryption key (sent by sender)
-    QKEY (NonEmpty (SMPQueueInfo, SndPublicVerifyKey))
+    QKEY (NonEmpty (SMPQueueInfo, SndPublicAuthKey))
   | -- inform that the queues are ready to use (sent by recipient)
     QUSE (NonEmpty (SndQAddr, Bool))
   | -- sent by the sender to test new queues and to complete switching
@@ -1059,7 +1122,6 @@ type SndQAddr = (SMPServer, SMP.SenderId)
 instance Encoding AMessage where
   smpEncode = \case
     HELLO -> smpEncode HELLO_
-    REPLY smpQueues -> smpEncode (REPLY_, smpQueues)
     A_MSG body -> smpEncode (A_MSG_, Tail body)
     A_RCVD mrs -> smpEncode (A_RCVD_, mrs)
     QCONT addr -> smpEncode (QCONT_, addr)
@@ -1072,7 +1134,6 @@ instance Encoding AMessage where
     smpP
       >>= \case
         HELLO_ -> pure HELLO
-        REPLY_ -> REPLY <$> smpP
         A_MSG_ -> A_MSG . unTail <$> smpP
         A_RCVD_ -> A_RCVD <$> smpP
         QCONT_ -> QCONT <$> smpP
@@ -1102,7 +1163,7 @@ instance forall m. ConnectionModeI m => StrEncoding (ConnectionRequestUri m) whe
     CRInvitationUri crData e2eParams -> crEncode "invitation" crData (Just e2eParams)
     CRContactUri crData -> crEncode "contact" crData Nothing
     where
-      crEncode :: ByteString -> ConnReqUriData -> Maybe (E2ERatchetParamsUri 'C.X448) -> ByteString
+      crEncode :: ByteString -> ConnReqUriData -> Maybe (RcvE2ERatchetParamsUri 'C.X448) -> ByteString
       crEncode crMode ConnReqUriData {crScheme, crAgentVRange, crSmpQueues, crClientData} e2eParams =
         strEncode crScheme <> "/" <> crMode <> "#/?" <> queryStr
         where
@@ -1120,20 +1181,25 @@ instance forall m. ConnectionModeI m => StrEncoding (ConnectionRequestUri m) whe
 instance StrEncoding AConnectionRequestUri where
   strEncode (ACR _ cr) = strEncode cr
   strP = do
-    _crScheme :: ConnReqScheme <- strP
+    _crScheme :: ServiceScheme <- strP
     crMode <- A.char '/' *> crModeP <* optional (A.char '/') <* "#/?"
     query <- strP
-    crAgentVRange <- queryParam "v" query
+    aVRange <- queryParam "v" query
     crSmpQueues <- queryParam "smp" query
     let crClientData = safeDecodeUtf8 <$> queryParamStr "data" query
-    let crData = ConnReqUriData {crScheme = CRSSimplex, crAgentVRange, crSmpQueues, crClientData}
+    let crData = ConnReqUriData {crScheme = SSSimplex, crAgentVRange = aVRange, crSmpQueues, crClientData}
     case crMode of
       CMInvitation -> do
         crE2eParams <- queryParam "e2e" query
         pure . ACR SCMInvitation $ CRInvitationUri crData crE2eParams
-      CMContact -> pure . ACR SCMContact $ CRContactUri crData
+      -- contact links are adjusted to the minimum version supported by the agent
+      -- to preserve compatibility with the old links published online
+      CMContact -> pure . ACR SCMContact $ CRContactUri crData {crAgentVRange = adjustAgentVRange aVRange}
     where
       crModeP = "invitation" $> CMInvitation <|> "contact" $> CMContact
+      adjustAgentVRange vr =
+        let v = max duplexHandshakeSMPAgentVersion $ minVersion vr
+         in fromMaybe vr $ safeVersionRange v (max v $ maxVersion vr)
 
 instance ConnectionModeI m => FromJSON (ConnectionRequestUri m) where
   parseJSON = strParseJSON "ConnectionRequestUri"
@@ -1210,16 +1276,16 @@ sameQueue :: SMPQueue q => (SMPServer, SMP.QueueId) -> q -> Bool
 sameQueue addr q = sameQAddress addr (qAddress q)
 {-# INLINE sameQueue #-}
 
-data SMPQueueInfo = SMPQueueInfo {clientVersion :: Version, queueAddress :: SMPQueueAddress}
+data SMPQueueInfo = SMPQueueInfo {clientVersion :: VersionSMPC, queueAddress :: SMPQueueAddress}
   deriving (Eq, Show)
 
 instance Encoding SMPQueueInfo where
   smpEncode (SMPQueueInfo clientVersion SMPQueueAddress {smpServer, senderId, dhPublicKey})
-    | clientVersion > 1 = smpEncode (clientVersion, smpServer, senderId, dhPublicKey)
+    | clientVersion > initialSMPClientVersion = smpEncode (clientVersion, smpServer, senderId, dhPublicKey)
     | otherwise = smpEncode clientVersion <> legacyEncodeServer smpServer <> smpEncode (senderId, dhPublicKey)
   smpP = do
     clientVersion <- smpP
-    smpServer <- if clientVersion > 1 then smpP else updateSMPServerHosts <$> legacyServerP
+    smpServer <- if clientVersion > initialSMPClientVersion then smpP else updateSMPServerHosts <$> legacyServerP
     (senderId, dhPublicKey) <- smpP
     pure $ SMPQueueInfo clientVersion SMPQueueAddress {smpServer, senderId, dhPublicKey}
 
@@ -1227,20 +1293,20 @@ instance Encoding SMPQueueInfo where
 -- But this is created to allow backward and forward compatibility where SMPQueueUri
 -- could have more fields to convert to different versions of SMPQueueInfo in a different way,
 -- and this instance would become non-trivial.
-instance VersionI SMPQueueInfo where
-  type VersionRangeT SMPQueueInfo = SMPQueueUri
+instance VersionI SMPClientVersion SMPQueueInfo where
+  type VersionRangeT SMPClientVersion SMPQueueInfo = SMPQueueUri
   version = clientVersion
   toVersionRangeT (SMPQueueInfo _v addr) vr = SMPQueueUri vr addr
 
-instance VersionRangeI SMPQueueUri where
-  type VersionT SMPQueueUri = SMPQueueInfo
+instance VersionRangeI SMPClientVersion SMPQueueUri where
+  type VersionT SMPClientVersion SMPQueueUri = SMPQueueInfo
   versionRange = clientVRange
   toVersionT (SMPQueueUri _vr addr) v = SMPQueueInfo v addr
 
 -- | SMP queue information sent out-of-band.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#out-of-band-messages
-data SMPQueueUri = SMPQueueUri {clientVRange :: VersionRange, queueAddress :: SMPQueueAddress}
+data SMPQueueUri = SMPQueueUri {clientVRange :: VersionRangeSMPC, queueAddress :: SMPQueueAddress}
   deriving (Eq, Show)
 
 data SMPQueueAddress = SMPQueueAddress
@@ -1274,7 +1340,7 @@ sameQAddress (srv, qId) (srv', qId') = sameSrvAddr srv srv' && qId == qId'
 
 instance StrEncoding SMPQueueUri where
   strEncode (SMPQueueUri vr SMPQueueAddress {smpServer = srv, senderId = qId, dhPublicKey})
-    | minVersion vr > 1 = strEncode srv <> "/" <> strEncode qId <> "#/?" <> query queryParams
+    | minVersion vr >= srvHostnamesSMPClientVersion = strEncode srv <> "/" <> strEncode qId <> "#/?" <> query queryParams
     | otherwise = legacyStrEncodeServer srv <> "/" <> strEncode qId <> "#/?" <> query (queryParams <> srvParam)
     where
       query = strEncode . QSP QEscape
@@ -1286,10 +1352,10 @@ instance StrEncoding SMPQueueUri where
     senderId <- strP <* optional (A.char '/') <* A.char '#'
     (vr, hs, dhPublicKey) <- unversioned <|> versioned
     let srv' = srv {host = h :| host <> hs}
-        smpServer = if maxVersion vr == 1 then updateSMPServerHosts srv' else srv'
+        smpServer = if maxVersion vr < srvHostnamesSMPClientVersion then updateSMPServerHosts srv' else srv'
     pure $ SMPQueueUri vr SMPQueueAddress {smpServer, senderId, dhPublicKey}
     where
-      unversioned = (versionToRange 1,[],) <$> strP <* A.endOfInput
+      unversioned = (versionToRange initialSMPClientVersion,[],) <$> strP <* A.endOfInput
       versioned = do
         dhKey_ <- optional strP
         query <- optional (A.char '/') *> A.char '?' *> strP
@@ -1306,8 +1372,8 @@ instance Encoding SMPQueueUri where
     pure $ SMPQueueUri clientVRange SMPQueueAddress {smpServer, senderId, dhPublicKey}
 
 data ConnectionRequestUri (m :: ConnectionMode) where
-  CRInvitationUri :: ConnReqUriData -> E2ERatchetParamsUri 'C.X448 -> ConnectionRequestUri CMInvitation
-  -- contact connection request does NOT contain E2E encryption parameters -
+  CRInvitationUri :: ConnReqUriData -> RcvE2ERatchetParamsUri 'C.X448 -> ConnectionRequestUri CMInvitation
+  -- contact connection request does NOT contain E2E encryption parameters for double ratchet -
   -- they are passed in AgentInvitation message
   CRContactUri :: ConnReqUriData -> ConnectionRequestUri CMContact
 
@@ -1318,15 +1384,15 @@ deriving instance Show (ConnectionRequestUri m)
 data AConnectionRequestUri = forall m. ConnectionModeI m => ACR (SConnectionMode m) (ConnectionRequestUri m)
 
 instance Eq AConnectionRequestUri where
-  ACR m cr == ACR m' cr' = case testEquality m m' of
-    Just Refl -> cr == cr'
-    _ -> False
+   ACR m cr == ACR m' cr' = case testEquality m m' of
+     Just Refl -> cr == cr'
+     _ -> False
 
 deriving instance Show AConnectionRequestUri
 
 data ConnReqUriData = ConnReqUriData
-  { crScheme :: ConnReqScheme,
-    crAgentVRange :: VersionRange,
+  { crScheme :: ServiceScheme,
+    crAgentVRange :: VersionRangeSMPA,
     crSmpQueues :: NonEmpty SMPQueueUri,
     crClientData :: Maybe CRClientData
   }
@@ -1334,20 +1400,6 @@ data ConnReqUriData = ConnReqUriData
 
 type CRClientData = Text
 
-data ConnReqScheme = CRSSimplex | CRSAppServer SrvLoc
-  deriving (Eq, Show)
-
-instance StrEncoding ConnReqScheme where
-  strEncode = \case
-    CRSSimplex -> "simplex:"
-    CRSAppServer srv -> "https://" <> strEncode srv
-  strP =
-    "simplex:" $> CRSSimplex
-      <|> "https://" *> (CRSAppServer <$> strP)
-
-simplexChat :: ConnReqScheme
-simplexChat = CRSAppServer $ SrvLoc "simplex.chat" ""
-
 -- | SMP queue status.
 data QueueStatus
   = -- | queue is created
@@ -1432,6 +1484,8 @@ data AgentErrorType
     AGENT {agentErr :: SMPAgentError}
   | -- | agent implementation or dependency errors
     INTERNAL {internalErr :: String}
+  | -- | critical agent errors that should be shown to the user, optionally with restart button
+    CRITICAL {offerRestart :: Bool, criticalErr :: String}
   | -- | agent inactive
     INACTIVE
   deriving (Eq, Show, Exception)
@@ -1543,6 +1597,7 @@ instance StrEncoding AgentErrorType where
       <|> "AGENT QUEUE " *> (AGENT . A_QUEUE <$> parseRead A.takeByteString)
       <|> "AGENT " *> (AGENT <$> parseRead1)
       <|> "INTERNAL " *> (INTERNAL <$> parseRead A.takeByteString)
+      <|> "CRITICAL " *> (CRITICAL <$> parseRead1 <* A.space <*> parseRead A.takeByteString)
       <|> "INACTIVE" $> INACTIVE
     where
       textP = T.unpack . safeDecodeUtf8 <$> A.takeTill (== ' ')
@@ -1560,6 +1615,7 @@ instance StrEncoding AgentErrorType where
     AGENT (A_QUEUE e) -> "AGENT QUEUE " <> bshow e
     AGENT e -> "AGENT " <> bshow e
     INTERNAL e -> "INTERNAL " <> bshow e
+    CRITICAL restart e -> "CRITICAL " <> bshow restart <> " " <> bshow e
     INACTIVE -> "INACTIVE"
     where
       text = encodeUtf8 . T.pack
@@ -1607,6 +1663,7 @@ instance StrEncoding ACmdTag where
       "MID" -> ct MID_
       "SENT" -> ct SENT_
       "MERR" -> ct MERR_
+      "MERRS" -> ct MERRS_
       "MSG" -> ct MSG_
       "MSGNTF" -> ct MSGNTF_
       "ACK" -> t ACK_
@@ -1663,6 +1720,7 @@ instance (APartyI p, AEntityI e) => StrEncoding (ACommandTag p e) where
     MID_ -> "MID"
     SENT_ -> "SENT"
     MERR_ -> "MERR"
+    MERRS_ -> "MERRS"
     MSG_ -> "MSG"
     MSGNTF_ -> "MSGNTF"
     ACK_ -> "ACK"
@@ -1703,13 +1761,13 @@ commandP binaryP =
     >>= \case
       ACmdTag SClient e cmd ->
         ACmd SClient e <$> case cmd of
-          NEW_ -> s (NEW <$> strP_ <*> strP_ <*> strP)
-          JOIN_ -> s (JOIN <$> strP_ <*> strP_ <*> strP_ <*> binaryP)
+          NEW_ -> s (NEW <$> strP_ <*> strP_ <*> pqIKP <*> (strP <|> pure SMP.SMSubscribe))
+          JOIN_ -> s (JOIN <$> strP_ <*> strP_ <*> pqSupP <*> (strP_ <|> pure SMP.SMSubscribe) <*> binaryP)
           LET_ -> s (LET <$> A.takeTill (== ' ') <* A.space <*> binaryP)
-          ACPT_ -> s (ACPT <$> A.takeTill (== ' ') <* A.space <*> binaryP)
+          ACPT_ -> s (ACPT <$> A.takeTill (== ' ') <* A.space <*> pqSupP <*> binaryP)
           RJCT_ -> s (RJCT <$> A.takeByteString)
           SUB_ -> pure SUB
-          SEND_ -> s (SEND <$> smpP <* A.space <*> binaryP)
+          SEND_ -> s (SEND <$> pqEncP <*> smpP <* A.space <*> binaryP)
           ACK_ -> s (ACK <$> A.decimal <*> optional (A.space *> binaryP))
           SWCH_ -> pure SWCH
           OFF_ -> pure OFF
@@ -1718,10 +1776,10 @@ commandP binaryP =
       ACmdTag SAgent e cmd ->
         ACmd SAgent e <$> case cmd of
           INV_ -> s (INV <$> strP)
-          CONF_ -> s (CONF <$> A.takeTill (== ' ') <* A.space <*> strListP <* A.space <*> binaryP)
-          REQ_ -> s (REQ <$> A.takeTill (== ' ') <* A.space <*> strP_ <*> binaryP)
-          INFO_ -> s (INFO <$> binaryP)
-          CON_ -> pure CON
+          CONF_ -> s (CONF <$> A.takeTill (== ' ') <* A.space <*> pqSupP <*> strListP <* A.space <*> binaryP)
+          REQ_ -> s (REQ <$> A.takeTill (== ' ') <* A.space <*> pqSupP <*> strP_ <*> binaryP)
+          INFO_ -> s (INFO <$> pqSupP <*> binaryP)
+          CON_ -> s (CON <$> strP)
           END_ -> pure END
           CONNECT_ -> s (CONNECT <$> strP_ <*> strP)
           DISCONNECT_ -> s (DISCONNECT <$> strP_ <*> strP)
@@ -1729,9 +1787,10 @@ commandP binaryP =
           UP_ -> s (UP <$> strP_ <*> connections)
           SWITCH_ -> s (SWITCH <$> strP_ <*> strP_ <*> strP)
           RSYNC_ -> s (RSYNC <$> strP_ <*> strP <*> strP)
-          MID_ -> s (MID <$> A.decimal)
+          MID_ -> s (MID <$> A.decimal <*> _strP)
           SENT_ -> s (SENT <$> A.decimal)
           MERR_ -> s (MERR <$> A.decimal <* A.space <*> strP)
+          MERRS_ -> s (MERRS <$> strP_ <*> strP)
           MSG_ -> s (MSG <$> strP <* A.space <*> smpP <* A.space <*> binaryP)
           MSGNTF_ -> s (MSGNTF <$> strP)
           RCVD_ -> s (RCVD <$> strP <* A.space <*> strP)
@@ -1751,6 +1810,12 @@ commandP binaryP =
   where
     s :: Parser a -> Parser a
     s p = A.space *> p
+    pqIKP :: Parser InitialKeys
+    pqIKP = strP_ <|> pure (IKNoPQ PQSupportOff)
+    pqSupP :: Parser PQSupport
+    pqSupP = strP_ <|> pure PQSupportOff
+    pqEncP :: Parser PQEncryption
+    pqEncP = strP_ <|> pure PQEncOff
     connections :: Parser [ConnId]
     connections = strP `A.sepBy'` A.char ','
     sfDone :: Text -> Either String (ACommand 'Agent 'AESndFile)
@@ -1766,15 +1831,15 @@ parseCommand = parse (commandP A.takeByteString) $ CMD SYNTAX
 -- | Serialize SMP agent command.
 serializeCommand :: ACommand p e -> ByteString
 serializeCommand = \case
-  NEW ntfs cMode subMode -> s (NEW_, ntfs, cMode, subMode)
+  NEW ntfs cMode pqIK subMode -> s (NEW_, ntfs, cMode, pqIK, subMode)
   INV cReq -> s (INV_, cReq)
-  JOIN ntfs cReq subMode cInfo -> s (JOIN_, ntfs, cReq, subMode, Str $ serializeBinary cInfo)
-  CONF confId srvs cInfo -> B.unwords [s CONF_, confId, strEncodeList srvs, serializeBinary cInfo]
+  JOIN ntfs cReq pqSup subMode cInfo -> s (JOIN_, ntfs, cReq, pqSup, subMode, Str $ serializeBinary cInfo)
+  CONF confId pqSup srvs cInfo -> B.unwords [s CONF_, confId, s pqSup, strEncodeList srvs, serializeBinary cInfo]
   LET confId cInfo -> B.unwords [s LET_, confId, serializeBinary cInfo]
-  REQ invId srvs cInfo -> B.unwords [s REQ_, invId, s srvs, serializeBinary cInfo]
-  ACPT invId cInfo -> B.unwords [s ACPT_, invId, serializeBinary cInfo]
+  REQ invId pqSup srvs cInfo -> B.unwords [s REQ_, invId, s pqSup, s srvs, serializeBinary cInfo]
+  ACPT invId pqSup cInfo -> B.unwords [s ACPT_, invId, s pqSup, serializeBinary cInfo]
   RJCT invId -> B.unwords [s RJCT_, invId]
-  INFO cInfo -> B.unwords [s INFO_, serializeBinary cInfo]
+  INFO pqSup cInfo -> B.unwords [s INFO_, s pqSup, serializeBinary cInfo]
   SUB -> s SUB_
   END -> s END_
   CONNECT p h -> s (CONNECT_, p, h)
@@ -1783,13 +1848,14 @@ serializeCommand = \case
   UP srv conns -> B.unwords [s UP_, s srv, connections conns]
   SWITCH dir phase srvs -> s (SWITCH_, dir, phase, srvs)
   RSYNC rrState cryptoErr cstats -> s (RSYNC_, rrState, cryptoErr, cstats)
-  SEND msgFlags msgBody -> B.unwords [s SEND_, smpEncode msgFlags, serializeBinary msgBody]
-  MID mId -> s (MID_, Str $ bshow mId)
-  SENT mId -> s (SENT_, Str $ bshow mId)
-  MERR mId e -> s (MERR_, Str $ bshow mId, e)
+  SEND pqEnc msgFlags msgBody -> B.unwords [s SEND_, s pqEnc, smpEncode msgFlags, serializeBinary msgBody]
+  MID mId pqEnc -> s (MID_, mId, pqEnc)
+  SENT mId -> s (SENT_, mId)
+  MERR mId e -> s (MERR_, mId, e)
+  MERRS mIds e -> s (MERRS_, mIds, e)
   MSG msgMeta msgFlags msgBody -> B.unwords [s MSG_, s msgMeta, smpEncode msgFlags, serializeBinary msgBody]
   MSGNTF smpMsgMeta -> s (MSGNTF_, smpMsgMeta)
-  ACK mId rcptInfo_ -> s (ACK_, Str $ bshow mId) <> maybe "" (B.cons ' ' . serializeBinary) rcptInfo_
+  ACK mId rcptInfo_ -> s (ACK_, mId) <> maybe "" (B.cons ' ' . serializeBinary) rcptInfo_
   RCVD msgMeta rcpts -> s (RCVD_, msgMeta, rcpts)
   SWCH -> s SWCH_
   OFF -> s OFF_
@@ -1799,7 +1865,7 @@ serializeCommand = \case
   DEL_USER userId -> s (DEL_USER_, userId)
   CHK -> s CHK_
   STAT srvs -> s (STAT_, srvs)
-  CON -> s CON_
+  CON pqEnc -> s (CON_, pqEnc)
   ERR e -> s (ERR_, e)
   OK -> s OK_
   SUSPENDED -> s SUSPENDED_
@@ -1872,14 +1938,14 @@ tGet party h = liftIO (tGetRaw h) >>= tParseLoadBody
     cmdWithMsgBody :: APartyCmd p -> m (Either AgentErrorType (APartyCmd p))
     cmdWithMsgBody (APC e cmd) =
       APC e <$$> case cmd of
-        SEND msgFlags body -> SEND msgFlags <$$> getBody body
+        SEND pqEnc msgFlags body -> SEND pqEnc msgFlags <$$> getBody body
         MSG msgMeta msgFlags body -> MSG msgMeta msgFlags <$$> getBody body
-        JOIN ntfs qUri subMode cInfo -> JOIN ntfs qUri subMode <$$> getBody cInfo
-        CONF confId srvs cInfo -> CONF confId srvs <$$> getBody cInfo
+        JOIN ntfs qUri pqSup subMode cInfo -> JOIN ntfs qUri pqSup subMode <$$> getBody cInfo
+        CONF confId pqSup srvs cInfo -> CONF confId pqSup srvs <$$> getBody cInfo
         LET confId cInfo -> LET confId <$$> getBody cInfo
-        REQ invId srvs cInfo -> REQ invId srvs <$$> getBody cInfo
-        ACPT invId cInfo -> ACPT invId <$$> getBody cInfo
-        INFO cInfo -> INFO <$$> getBody cInfo
+        REQ invId pqSup srvs cInfo -> REQ invId pqSup srvs <$$> getBody cInfo
+        ACPT invId pqSup cInfo -> ACPT invId pqSup <$$> getBody cInfo
+        INFO pqSup cInfo -> INFO pqSup <$$> getBody cInfo
         _ -> pure $ Right cmd
 
     getBody :: ByteString -> m (Either AgentErrorType ByteString)

src/Simplex/Messaging/Agent/RetryInterval.hs

@@ -8,6 +8,7 @@ module Simplex.Messaging.Agent.RetryInterval
     RetryIntervalMode (..),
     RI2State (..),
     withRetryInterval,
+    withRetryIntervalCount,
     withRetryLock2,
     updateRetryInterval2,
   )
@@ -48,15 +49,18 @@ data RetryIntervalMode = RISlow | RIFast
   deriving (Eq, Show)
 
 withRetryInterval :: forall m a. MonadIO m => RetryInterval -> (Int64 -> m a -> m a) -> m a
-withRetryInterval ri action = callAction 0 $ initialInterval ri
+withRetryInterval ri = withRetryIntervalCount ri . const
+
+withRetryIntervalCount :: forall m a. MonadIO m => RetryInterval -> (Int -> Int64 -> m a -> m a) -> m a
+withRetryIntervalCount ri action = callAction 0 0 $ initialInterval ri
   where
-    callAction :: Int64 -> Int64 -> m a
-    callAction elapsed delay = action delay loop
+    callAction :: Int -> Int64 -> Int64 -> m a
+    callAction n elapsed delay = action n delay loop
       where
         loop = do
           liftIO $ threadDelay' delay
           let elapsed' = elapsed + delay
-          callAction elapsed' $ nextDelay elapsed' delay ri
+          callAction (n + 1) elapsed' $ nextDelay elapsed' delay ri
 
 -- This function allows action to toggle between slow and fast retry intervals.
 withRetryLock2 :: forall m. MonadIO m => RetryInterval2 -> TMVar () -> (RI2State -> (RetryIntervalMode -> m ()) -> m ()) -> m ()

src/Simplex/Messaging/Agent/Server.hs

@@ -34,23 +34,25 @@ import UnliftIO.STM
 -- See a full agent executable here: https://github.com/simplex-chat/simplexmq/blob/master/apps/smp-agent/Main.hs
 runSMPAgent :: (MonadRandom m, MonadUnliftIO m) => ATransport -> AgentConfig -> InitialAgentServers -> SQLiteStore -> m ()
 runSMPAgent t cfg initServers store =
-  runSMPAgentBlocking t cfg initServers store =<< newEmptyTMVarIO
+  runSMPAgentBlocking t cfg initServers store 0 =<< newEmptyTMVarIO
 
 -- | Runs an SMP agent as a TCP service using passed configuration with signalling.
 --
 -- This function uses passed TMVar to signal when the server is ready to accept TCP requests (True)
 -- and when it is disconnected from the TCP socket once the server thread is killed (False).
-runSMPAgentBlocking :: (MonadRandom m, MonadUnliftIO m) => ATransport -> AgentConfig -> InitialAgentServers -> SQLiteStore -> TMVar Bool -> m ()
-runSMPAgentBlocking (ATransport t) cfg@AgentConfig {tcpPort, caCertificateFile, certificateFile, privateKeyFile} initServers store started = do
+runSMPAgentBlocking :: (MonadRandom m, MonadUnliftIO m) => ATransport -> AgentConfig -> InitialAgentServers -> SQLiteStore -> Int -> TMVar Bool -> m ()
+runSMPAgentBlocking (ATransport t) cfg@AgentConfig {tcpPort, caCertificateFile, certificateFile, privateKeyFile} initServers store initClientId started = do
   liftIO (newSMPAgentEnv cfg store) >>= runReaderT (smpAgent t)
   where
     smpAgent :: forall c m'. (Transport c, MonadUnliftIO m', MonadReader Env m') => TProxy c -> m' ()
     smpAgent _ = do
       -- tlsServerParams is not in Env to avoid breaking functional API w/t key and certificate generation
       tlsServerParams <- liftIO $ loadTLSServerParams caCertificateFile certificateFile privateKeyFile
+      clientId <- newTVarIO initClientId
       runTransportServer started tcpPort tlsServerParams defaultTransportServerConfig $ \(h :: c) -> do
         liftIO . putLn h $ "Welcome to SMP agent v" <> B.pack simplexMQVersion
-        c <- getAgentClient initServers
+        cId <- atomically $ stateTVar clientId $ \i -> (i + 1, i + 1)
+        c <- getAgentClient cId initServers
         logConnection c True
         race_ (connectClient h c) (runAgentClient c)
           `E.finally` disconnectAgentClient c

src/Simplex/Messaging/Agent/Store.hs

@@ -3,6 +3,7 @@
 {-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE LambdaCase #-}
@@ -29,35 +30,52 @@ import Data.Type.Equality
 import Simplex.Messaging.Agent.Protocol
 import Simplex.Messaging.Agent.RetryInterval (RI2State)
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Crypto.Ratchet (RatchetX448)
+import Simplex.Messaging.Crypto.Ratchet (RatchetX448, PQEncryption, PQSupport)
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol
   ( MsgBody,
     MsgFlags,
     MsgId,
     NotifierId,
-    NtfPrivateSignKey,
-    NtfPublicVerifyKey,
+    NtfPrivateAuthKey,
+    NtfPublicAuthKey,
     RcvDhSecret,
     RcvNtfDhSecret,
-    RcvPrivateSignKey,
-    SndPrivateSignKey,
+    RcvPrivateAuthKey,
+    SndPrivateAuthKey,
+    SndPublicAuthKey,
+    VersionSMPC,
   )
 import qualified Simplex.Messaging.Protocol as SMP
 import Simplex.Messaging.Util ((<$?>))
-import Simplex.Messaging.Version
 
 -- * Queue types
 
+data QueueStored = QSStored | QSNew
+
+data SQueueStored (q :: QueueStored) where
+  SQSStored :: SQueueStored 'QSStored
+  SQSNew :: SQueueStored 'QSNew
+
+data DBQueueId (q :: QueueStored) where
+  DBQueueId :: Int64 -> DBQueueId 'QSStored
+  DBNewQueue :: DBQueueId 'QSNew
+
+deriving instance Show (DBQueueId q)
+
+type RcvQueue = StoredRcvQueue 'QSStored
+
+type NewRcvQueue = StoredRcvQueue 'QSNew
+
 -- | A receive queue. SMP queue through which the agent receives messages from a sender.
-data RcvQueue = RcvQueue
+data StoredRcvQueue (q :: QueueStored) = RcvQueue
   { userId :: UserId,
     connId :: ConnId,
     server :: SMPServer,
     -- | recipient queue ID
     rcvId :: SMP.RecipientId,
-    -- | key used by the recipient to sign transmissions
-    rcvPrivateKey :: RcvPrivateSignKey,
+    -- | key used by the recipient to authorize transmissions
+    rcvPrivateKey :: RcvPrivateAuthKey,
     -- | shared DH secret used to encrypt/decrypt message bodies from server to recipient
     rcvDhSecret :: RcvDhSecret,
     -- | private DH key related to public sent to sender out-of-band (to agree simple per-queue e2e)
@@ -69,19 +87,19 @@ data RcvQueue = RcvQueue
     -- | queue status
     status :: QueueStatus,
     -- | database queue ID (within connection)
-    dbQueueId :: Int64,
+    dbQueueId :: DBQueueId q,
     -- | True for a primary or a next primary queue of the connection (next if dbReplaceQueueId is set)
     primary :: Bool,
     -- | database queue ID to replace, Nothing if this queue is not replacing another, `Just Nothing` is used for replacing old queues
     dbReplaceQueueId :: Maybe Int64,
     rcvSwchStatus :: Maybe RcvSwitchStatus,
     -- | SMP client version
-    smpClientVersion :: Version,
+    smpClientVersion :: VersionSMPC,
     -- | credentials used in context of notifications
     clientNtfCreds :: Maybe ClientNtfCreds,
     deleteErrors :: Int
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 rcvQueueInfo :: RcvQueue -> RcvQueueInfo
 rcvQueueInfo rq@RcvQueue {server, rcvSwchStatus} =
@@ -100,26 +118,31 @@ canAbortRcvSwitch = maybe False canAbort . rcvSwchStatus
       RSReceivedMessage -> False
 
 data ClientNtfCreds = ClientNtfCreds
-  { -- | key pair to be used by the notification server to sign transmissions
-    ntfPublicKey :: NtfPublicVerifyKey,
-    ntfPrivateKey :: NtfPrivateSignKey,
+  { -- | key pair to be used by the notification server to authorize transmissions
+    ntfPublicKey :: NtfPublicAuthKey,
+    ntfPrivateKey :: NtfPrivateAuthKey,
     -- | queue ID to be used by the notification server for NSUB command
     notifierId :: NotifierId,
     -- | shared DH secret used to encrypt/decrypt notification metadata (NMsgMeta) from server to recipient
     rcvNtfDhSecret :: RcvNtfDhSecret
   }
-  deriving (Eq, Show)
+  deriving (Show)
+
+type SndQueue = StoredSndQueue 'QSStored
+
+type NewSndQueue = StoredSndQueue 'QSNew
 
 -- | A send queue. SMP queue through which the agent sends messages to a recipient.
-data SndQueue = SndQueue
+data StoredSndQueue (q :: QueueStored) = SndQueue
   { userId :: UserId,
     connId :: ConnId,
     server :: SMPServer,
     -- | sender queue ID
     sndId :: SMP.SenderId,
-    -- | key pair used by the sender to sign transmissions
-    sndPublicKey :: Maybe C.APublicVerifyKey,
-    sndPrivateKey :: SndPrivateSignKey,
+    -- | key pair used by the sender to authorize transmissions
+    -- TODO combine keys to key pair so that types match
+    sndPublicKey :: Maybe SndPublicAuthKey,
+    sndPrivateKey :: SndPrivateAuthKey,
     -- | DH public key used to negotiate per-queue e2e encryption
     e2ePubKey :: Maybe C.PublicKeyX25519,
     -- | shared DH secret agreed for simple per-queue e2e encryption
@@ -127,16 +150,16 @@ data SndQueue = SndQueue
     -- | queue status
     status :: QueueStatus,
     -- | database queue ID (within connection)
-    dbQueueId :: Int64,
+    dbQueueId :: DBQueueId q,
     -- | True for a primary or a next primary queue of the connection (next if dbReplaceQueueId is set)
     primary :: Bool,
     -- | ID of the queue this one is replacing
     dbReplaceQueueId :: Maybe Int64,
     sndSwchStatus :: Maybe SndSwitchStatus,
     -- | SMP client version
-    smpClientVersion :: Version
+    smpClientVersion :: VersionSMPC
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 sndQueueInfo :: SndQueue -> SndQueueInfo
 sndQueueInfo SndQueue {server, sndSwchStatus} =
@@ -194,7 +217,7 @@ instance SMPQueueRec RcvQueue where
   {-# INLINE qUserId #-}
   qConnId RcvQueue {connId} = connId
   {-# INLINE qConnId #-}
-  dbQId RcvQueue {dbQueueId} = dbQueueId
+  dbQId RcvQueue {dbQueueId = DBQueueId qId} = qId
   {-# INLINE dbQId #-}
   dbReplaceQId RcvQueue {dbReplaceQueueId} = dbReplaceQueueId
   {-# INLINE dbReplaceQId #-}
@@ -204,7 +227,7 @@ instance SMPQueueRec SndQueue where
   {-# INLINE qUserId #-}
   qConnId SndQueue {connId} = connId
   {-# INLINE qConnId #-}
-  dbQId SndQueue {dbQueueId} = dbQueueId
+  dbQId SndQueue {dbQueueId = DBQueueId qId} = qId
   {-# INLINE dbQId #-}
   dbReplaceQId SndQueue {dbReplaceQueueId} = dbReplaceQueueId
   {-# INLINE dbReplaceQId #-}
@@ -231,8 +254,6 @@ data Connection (d :: ConnType) where
   DuplexConnection :: ConnData -> NonEmpty RcvQueue -> NonEmpty SndQueue -> Connection CDuplex
   ContactConnection :: ConnData -> RcvQueue -> Connection CContact
 
-deriving instance Eq (Connection d)
-
 deriving instance Show (Connection d)
 
 toConnData :: Connection d -> ConnData
@@ -265,8 +286,6 @@ connType SCSnd = CSnd
 connType SCDuplex = CDuplex
 connType SCContact = CContact
 
-deriving instance Eq (SConnType d)
-
 deriving instance Show (SConnType d)
 
 instance TestEquality SConnType where
@@ -280,35 +299,24 @@ instance TestEquality SConnType where
 -- Used to refer to an arbitrary connection when retrieving from store.
 data SomeConn = forall d. SomeConn (SConnType d) (Connection d)
 
-instance Eq SomeConn where
-  SomeConn d c == SomeConn d' c' = case testEquality d d' of
-    Just Refl -> c == c'
-    _ -> False
-
 deriving instance Show SomeConn
 
 data ConnData = ConnData
   { connId :: ConnId,
     userId :: UserId,
-    connAgentVersion :: Version,
+    connAgentVersion :: VersionSMPA,
     enableNtfs :: Bool,
-    duplexHandshake :: Maybe Bool, -- added in agent protocol v2
     lastExternalSndId :: PrevExternalSndId,
     deleted :: Bool,
-    ratchetSyncState :: RatchetSyncState
+    ratchetSyncState :: RatchetSyncState,
+    pqSupport :: PQSupport
   }
   deriving (Eq, Show)
 
 -- this function should be mirrored in the clients
 ratchetSyncAllowed :: ConnData -> Bool
-ratchetSyncAllowed cData@ConnData {ratchetSyncState} =
-  ratchetSyncSupported' cData && (ratchetSyncState `elem` ([RSAllowed, RSRequired] :: [RatchetSyncState]))
-
-ratchetSyncSupported' :: ConnData -> Bool
-ratchetSyncSupported' ConnData {connAgentVersion} = connAgentVersion >= 3
-
-messageRcptsSupported :: ConnData -> Bool
-messageRcptsSupported ConnData {connAgentVersion} = connAgentVersion >= 4
+ratchetSyncAllowed ConnData {ratchetSyncState, connAgentVersion} =
+  connAgentVersion >= ratchetSyncSMPAgentVersion && (ratchetSyncState `elem` ([RSAllowed, RSRequired] :: [RatchetSyncState]))
 
 -- this function should be mirrored in the clients
 ratchetSyncSendProhibited :: ConnData -> Bool
@@ -316,7 +324,8 @@ ratchetSyncSendProhibited ConnData {ratchetSyncState} =
   ratchetSyncState `elem` ([RSRequired, RSStarted, RSAgreed] :: [RatchetSyncState])
 
 data PendingCommand = PendingCommand
-  { corrId :: ACorrId,
+  { cmdId :: AsyncCmdId,
+    corrId :: ACorrId,
     userId :: UserId,
     connId :: ConnId,
     command :: AgentCommand
@@ -364,11 +373,11 @@ instance StrEncoding AgentCommandTag where
 data InternalCommand
   = ICAck SMP.RecipientId MsgId
   | ICAckDel SMP.RecipientId MsgId InternalId
-  | ICAllowSecure SMP.RecipientId SMP.SndPublicVerifyKey
-  | ICDuplexSecure SMP.RecipientId SMP.SndPublicVerifyKey
+  | ICAllowSecure SMP.RecipientId SMP.SndPublicAuthKey
+  | ICDuplexSecure SMP.RecipientId SMP.SndPublicAuthKey
   | ICDeleteConn
   | ICDeleteRcvQueue SMP.RecipientId
-  | ICQSecure SMP.RecipientId SMP.SndPublicVerifyKey
+  | ICQSecure SMP.RecipientId SMP.SndPublicAuthKey
   | ICQDelete SMP.RecipientId
 
 data InternalCommandTag
@@ -515,6 +524,7 @@ data SndMsgData = SndMsgData
     msgType :: AgentMessageType,
     msgFlags :: MsgFlags,
     msgBody :: MsgBody,
+    pqEncryption :: PQEncryption,
     internalHash :: MsgHash,
     prevMsgHash :: MsgHash
   }
@@ -532,6 +542,7 @@ data PendingMsgData = PendingMsgData
     msgType :: AgentMessageType,
     msgFlags :: MsgFlags,
     msgBody :: MsgBody,
+    pqEncryption :: PQEncryption,
     msgRetryState :: Maybe RI2State,
     internalTs :: InternalTs
   }
@@ -621,4 +632,6 @@ data StoreError
     SEFileNotFound
   | -- | XFTP Deleted snd chunk replica not found.
     SEDeletedSndChunkReplicaNotFound
+  | -- | Error when reading work item that suspends worker - do not use!
+    SEWorkItemError ByteString
   deriving (Eq, Show, Exception)

src/Simplex/Messaging/Agent/Store/SQLite/Common.hs

@@ -71,7 +71,8 @@ dbBusyLoop action = loop 500 3000000
     loop :: Int -> Int -> IO a
     loop t tLim =
       action `E.catch` \(e :: SQLError) ->
-        if tLim > t && SQL.sqlError e == SQL.ErrorBusy
+        let se = SQL.sqlError e in
+        if tLim > t && (se == SQL.ErrorBusy || se == SQL.ErrorLocked)
           then do
             threadDelay t
             loop (t * 9 `div` 8) (tLim - t)

src/Simplex/Messaging/Agent/Store/SQLite/Migrations.hs

@@ -65,6 +65,12 @@ import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230720_delete_expired_
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230722_indexes
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230814_indexes
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230829_crypto_files
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20231222_command_created_at
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20231225_failed_work_items
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240121_message_delivery_indexes
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240124_file_redirect
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240223_connections_wait_delivery
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240225_ratchet_kem
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (dropPrefix, sumTypeJSON)
 import Simplex.Messaging.Transport.Client (TransportHost)
@@ -98,7 +104,13 @@ schemaMigrations =
     ("m20230720_delete_expired_messages", m20230720_delete_expired_messages, Just down_m20230720_delete_expired_messages),
     ("m20230722_indexes", m20230722_indexes, Just down_m20230722_indexes),
     ("m20230814_indexes", m20230814_indexes, Just down_m20230814_indexes),
-    ("m20230829_crypto_files", m20230829_crypto_files, Just down_m20230829_crypto_files)
+    ("m20230829_crypto_files", m20230829_crypto_files, Just down_m20230829_crypto_files),
+    ("m20231222_command_created_at", m20231222_command_created_at, Just down_m20231222_command_created_at),
+    ("m20231225_failed_work_items", m20231225_failed_work_items, Just down_m20231225_failed_work_items),
+    ("m20240121_message_delivery_indexes", m20240121_message_delivery_indexes, Just down_m20240121_message_delivery_indexes),
+    ("m20240124_file_redirect", m20240124_file_redirect, Just down_m20240124_file_redirect),
+    ("m20240223_connections_wait_delivery", m20240223_connections_wait_delivery, Just down_m20240223_connections_wait_delivery),
+    ("m20240225_ratchet_kem", m20240225_ratchet_kem, Just down_m20240225_ratchet_kem)
   ]
 
 -- | The list of migrations in ascending order by date
@@ -124,9 +136,12 @@ run st = \case
   where
     runUp Migration {name, up, down} = withTransaction' st $ \db -> do
       when (name == "m20220811_onion_hosts") $ updateServers db
-      insert db >> execSQL db up
+      insert db >> execSQL db up'
       where
         insert db = DB.execute db "INSERT INTO migrations (name, down, ts) VALUES (?,?,?)" . (name,down,) =<< getCurrentTime
+        up'
+          | dbNew st && name == "m20230110_users" = fromQuery new_m20230110_users
+          | otherwise = up
         updateServers db = forM_ (M.assocs extraSMPServerHosts) $ \(h, h') ->
           let hs = decodeLatin1 . strEncode $ ([h, h'] :: NonEmpty TransportHost)
            in DB.execute db "UPDATE servers SET host = ? WHERE host = ?" (hs, decodeLatin1 $ strEncode h)

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230110_users.hs

@@ -27,3 +27,24 @@ UPDATE connections SET user_id = 1;
 
 PRAGMA ignore_check_constraints=OFF;
 |]
+
+-- This is executed in the new database
+-- It does not create new user record
+new_m20230110_users :: Query
+new_m20230110_users =
+  [sql|
+PRAGMA ignore_check_constraints=ON;
+
+CREATE TABLE users (
+  user_id INTEGER PRIMARY KEY AUTOINCREMENT
+);
+
+ALTER TABLE connections ADD COLUMN user_id INTEGER CHECK (user_id NOT NULL)
+REFERENCES users ON DELETE CASCADE;
+
+CREATE INDEX idx_connections_user ON connections(user_id);
+
+CREATE INDEX idx_commands_conn_id ON commands(conn_id);
+
+PRAGMA ignore_check_constraints=OFF;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20231222_command_created_at.hs

@@ -0,0 +1,20 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20231222_command_created_at where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20231222_command_created_at :: Query
+m20231222_command_created_at =
+  [sql|
+ALTER TABLE commands ADD COLUMN created_at TEXT NOT NULL DEFAULT('1970-01-01 00:00:00');
+CREATE INDEX idx_commands_server_commands ON commands(host, port, created_at, command_id);
+|]
+
+down_m20231222_command_created_at :: Query
+down_m20231222_command_created_at =
+  [sql|
+DROP INDEX idx_commands_server_commands;
+ALTER TABLE commands DROP COLUMN created_at;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20231225_failed_work_items.hs

@@ -0,0 +1,38 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20231225_failed_work_items where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20231225_failed_work_items :: Query
+m20231225_failed_work_items =
+    [sql|
+ALTER TABLE snd_message_deliveries ADD COLUMN failed INTEGER DEFAULT 0;
+ALTER TABLE commands ADD COLUMN failed INTEGER DEFAULT 0;
+ALTER TABLE ntf_subscriptions ADD COLUMN ntf_failed INTEGER DEFAULT 0;
+ALTER TABLE ntf_subscriptions ADD COLUMN smp_failed INTEGER DEFAULT 0;
+ALTER TABLE rcv_files ADD COLUMN failed INTEGER DEFAULT 0;
+ALTER TABLE snd_files ADD COLUMN failed INTEGER DEFAULT 0;
+ALTER TABLE deleted_snd_chunk_replicas ADD COLUMN failed INTEGER DEFAULT 0;
+
+CREATE INDEX idx_rcv_files_status_created_at ON rcv_files(status, created_at);
+CREATE INDEX idx_snd_files_status_created_at ON snd_files(status, created_at);
+CREATE INDEX idx_snd_files_snd_file_entity_id ON snd_files(snd_file_entity_id);
+|]
+
+down_m20231225_failed_work_items :: Query
+down_m20231225_failed_work_items =
+    [sql|
+DROP INDEX idx_rcv_files_status_created_at;
+DROP INDEX idx_snd_files_status_created_at;
+DROP INDEX idx_snd_files_snd_file_entity_id;
+
+ALTER TABLE snd_message_deliveries DROP COLUMN failed;
+ALTER TABLE commands DROP COLUMN failed;
+ALTER TABLE ntf_subscriptions DROP COLUMN ntf_failed;
+ALTER TABLE ntf_subscriptions DROP COLUMN smp_failed;
+ALTER TABLE rcv_files DROP COLUMN failed;
+ALTER TABLE snd_files DROP COLUMN failed;
+ALTER TABLE deleted_snd_chunk_replicas DROP COLUMN failed;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20240121_message_delivery_indexes.hs

@@ -0,0 +1,20 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240121_message_delivery_indexes where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20240121_message_delivery_indexes :: Query
+m20240121_message_delivery_indexes =
+    [sql|
+CREATE INDEX idx_messages_snd_expired ON messages(conn_id, internal_snd_id, internal_ts);
+CREATE INDEX idx_snd_message_deliveries_expired ON snd_message_deliveries(conn_id, snd_queue_id, failed, internal_id);
+|]
+
+down_m20240121_message_delivery_indexes :: Query
+down_m20240121_message_delivery_indexes =
+    [sql|
+DROP INDEX idx_messages_snd_expired;
+DROP INDEX idx_snd_message_deliveries_expired;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20240124_file_redirect.hs

@@ -0,0 +1,34 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240124_file_redirect where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20240124_file_redirect :: Query
+m20240124_file_redirect =
+    [sql|
+ALTER TABLE snd_files ADD COLUMN redirect_size INTEGER;
+ALTER TABLE snd_files ADD COLUMN redirect_digest BLOB;
+
+ALTER TABLE rcv_files ADD COLUMN redirect_id INTEGER REFERENCES rcv_files ON DELETE SET NULL;
+ALTER TABLE rcv_files ADD COLUMN redirect_entity_id BLOB;
+ALTER TABLE rcv_files ADD COLUMN redirect_size INTEGER;
+ALTER TABLE rcv_files ADD COLUMN redirect_digest BLOB;
+
+CREATE INDEX idx_rcv_files_redirect_id on rcv_files(redirect_id);
+|]
+
+down_m20240124_file_redirect :: Query
+down_m20240124_file_redirect =
+    [sql|
+DROP INDEX idx_rcv_files_redirect_id;
+
+ALTER TABLE snd_files DROP COLUMN redirect_size;
+ALTER TABLE snd_files DROP COLUMN redirect_digest;
+
+ALTER TABLE rcv_files DROP COLUMN redirect_id;
+ALTER TABLE rcv_files DROP COLUMN redirect_entity_id;
+ALTER TABLE rcv_files DROP COLUMN redirect_size;
+ALTER TABLE rcv_files DROP COLUMN redirect_digest;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20240223_connections_wait_delivery.hs

@@ -0,0 +1,18 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240223_connections_wait_delivery where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20240223_connections_wait_delivery :: Query
+m20240223_connections_wait_delivery =
+  [sql|
+ALTER TABLE connections ADD COLUMN deleted_at_wait_delivery TEXT;
+|]
+
+down_m20240223_connections_wait_delivery :: Query
+down_m20240223_connections_wait_delivery =
+  [sql|
+ALTER TABLE connections DROP COLUMN deleted_at_wait_delivery;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20240225_ratchet_kem.hs

@@ -0,0 +1,22 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240225_ratchet_kem where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20240225_ratchet_kem :: Query
+m20240225_ratchet_kem =
+    [sql|
+ALTER TABLE ratchets ADD COLUMN pq_priv_kem BLOB;
+ALTER TABLE connections ADD COLUMN pq_support INTEGER NOT NULL DEFAULT 0;
+ALTER TABLE messages ADD COLUMN pq_encryption INTEGER NOT NULL DEFAULT 0;
+|]
+
+down_m20240225_ratchet_kem :: Query
+down_m20240225_ratchet_kem =
+    [sql|
+ALTER TABLE ratchets DROP COLUMN pq_priv_kem;
+ALTER TABLE connections DROP COLUMN pq_support;
+ALTER TABLE messages DROP COLUMN pq_encryption;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/agent_schema.sql

@@ -26,7 +26,9 @@ CREATE TABLE connections(
   deleted INTEGER DEFAULT 0 CHECK(deleted NOT NULL),
   user_id INTEGER CHECK(user_id NOT NULL)
   REFERENCES users ON DELETE CASCADE,
-  ratchet_sync_state TEXT NOT NULL DEFAULT 'ok'
+  ratchet_sync_state TEXT NOT NULL DEFAULT 'ok',
+  deleted_at_wait_delivery TEXT,
+  pq_support INTEGER NOT NULL DEFAULT 0
 ) WITHOUT ROWID;
 CREATE TABLE rcv_queues(
   host TEXT NOT NULL,
@@ -89,6 +91,7 @@ CREATE TABLE messages(
   msg_type BLOB NOT NULL, --(H)ELLO,(R)EPLY,(D)ELETE. Should SMP confirmation be saved too?
   msg_body BLOB NOT NULL DEFAULT x'',
   msg_flags TEXT NULL,
+  pq_encryption INTEGER NOT NULL DEFAULT 0,
   PRIMARY KEY(conn_id, internal_id),
   FOREIGN KEY(conn_id, internal_rcv_id) REFERENCES rcv_messages
   ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED,
@@ -159,7 +162,8 @@ CREATE TABLE ratchets(
   e2e_version INTEGER NOT NULL DEFAULT 1
   ,
   x3dh_pub_key_1 BLOB,
-  x3dh_pub_key_2 BLOB
+  x3dh_pub_key_2 BLOB,
+  pq_priv_kem BLOB
 ) WITHOUT ROWID;
 CREATE TABLE skipped_messages(
   skipped_message_id INTEGER PRIMARY KEY,
@@ -213,6 +217,8 @@ CREATE TABLE ntf_subscriptions(
   created_at TEXT NOT NULL DEFAULT(datetime('now')),
   updated_at TEXT NOT NULL DEFAULT(datetime('now')),
   smp_server_key_hash BLOB,
+  ntf_failed INTEGER DEFAULT 0,
+  smp_failed INTEGER DEFAULT 0,
   PRIMARY KEY(conn_id),
   FOREIGN KEY(smp_host, smp_port) REFERENCES servers(host, port)
   ON DELETE SET NULL ON UPDATE CASCADE,
@@ -229,6 +235,8 @@ CREATE TABLE commands(
   command BLOB NOT NULL,
   agent_version INTEGER NOT NULL DEFAULT 1,
   server_key_hash BLOB,
+  created_at TEXT NOT NULL DEFAULT('1970-01-01 00:00:00'),
+  failed INTEGER DEFAULT 0,
   FOREIGN KEY(host, port) REFERENCES servers
   ON DELETE RESTRICT ON UPDATE CASCADE
 );
@@ -237,6 +245,7 @@ CREATE TABLE snd_message_deliveries(
   conn_id BLOB NOT NULL REFERENCES connections ON DELETE CASCADE,
   snd_queue_id INTEGER NOT NULL,
   internal_id INTEGER NOT NULL,
+  failed INTEGER DEFAULT 0,
   FOREIGN KEY(conn_id, internal_id) REFERENCES messages ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
 );
 CREATE TABLE sqlite_sequence(name,seq);
@@ -273,6 +282,11 @@ CREATE TABLE rcv_files(
   updated_at TEXT NOT NULL DEFAULT(datetime('now')),
   save_file_key BLOB,
   save_file_nonce BLOB,
+  failed INTEGER DEFAULT 0,
+  redirect_id INTEGER REFERENCES rcv_files ON DELETE SET NULL,
+  redirect_entity_id BLOB,
+  redirect_size INTEGER,
+  redirect_digest BLOB,
   UNIQUE(rcv_file_entity_id)
 );
 CREATE TABLE rcv_file_chunks(
@@ -315,7 +329,10 @@ CREATE TABLE snd_files(
   updated_at TEXT NOT NULL DEFAULT(datetime('now'))
   ,
   src_file_key BLOB,
-  src_file_nonce BLOB
+  src_file_nonce BLOB,
+  failed INTEGER DEFAULT 0,
+  redirect_size INTEGER,
+  redirect_digest BLOB
 );
 CREATE TABLE snd_file_chunks(
   snd_file_chunk_id INTEGER PRIMARY KEY,
@@ -359,6 +376,8 @@ CREATE TABLE deleted_snd_chunk_replicas(
   retries INTEGER NOT NULL DEFAULT 0,
   created_at TEXT NOT NULL DEFAULT(datetime('now')),
   updated_at TEXT NOT NULL DEFAULT(datetime('now'))
+  ,
+  failed INTEGER DEFAULT 0
 );
 CREATE TABLE encrypted_rcv_message_hashes(
   encrypted_rcv_message_hash_id INTEGER PRIMARY KEY,
@@ -479,3 +498,24 @@ CREATE INDEX idx_encrypted_rcv_message_hashes_created_at ON encrypted_rcv_messag
   created_at
 );
 CREATE INDEX idx_messages_internal_ts ON messages(internal_ts);
+CREATE INDEX idx_commands_server_commands ON commands(
+  host,
+  port,
+  created_at,
+  command_id
+);
+CREATE INDEX idx_rcv_files_status_created_at ON rcv_files(status, created_at);
+CREATE INDEX idx_snd_files_status_created_at ON snd_files(status, created_at);
+CREATE INDEX idx_snd_files_snd_file_entity_id ON snd_files(snd_file_entity_id);
+CREATE INDEX idx_messages_snd_expired ON messages(
+  conn_id,
+  internal_snd_id,
+  internal_ts
+);
+CREATE INDEX idx_snd_message_deliveries_expired ON snd_message_deliveries(
+  conn_id,
+  snd_queue_id,
+  failed,
+  internal_id
+);
+CREATE INDEX idx_rcv_files_redirect_id on rcv_files(redirect_id);

src/Simplex/Messaging/Agent/TAsyncs.hs

@@ -1,24 +0,0 @@
-module Simplex.Messaging.Agent.TAsyncs where
-
-import Control.Monad.IO.Unlift (MonadUnliftIO)
-import Simplex.Messaging.TMap (TMap)
-import qualified Simplex.Messaging.TMap as TM
-import UnliftIO.Async (Async, async)
-import UnliftIO.STM
-
-data TAsyncs = TAsyncs
-  { actionId :: TVar Int,
-    actions :: TMap Int (Async ())
-  }
-
-newTAsyncs :: STM TAsyncs
-newTAsyncs = TAsyncs <$> newTVar 0 <*> TM.empty
-
-newAsyncAction :: MonadUnliftIO m => (Int -> m ()) -> TAsyncs -> m ()
-newAsyncAction action as = do
-  aId <- atomically $ stateTVar (actionId as) $ \i -> (i + 1, i + 1)
-  a <- async $ action aId
-  atomically $ TM.insert aId a $ actions as
-
-removeAsyncAction :: Int -> TAsyncs -> STM ()
-removeAsyncAction aId = TM.delete aId . actions

src/Simplex/Messaging/Agent/TRcvQueues.hs

@@ -1,11 +1,13 @@
+{-# LANGUAGE LambdaCase #-}
+
 module Simplex.Messaging.Agent.TRcvQueues
-  ( TRcvQueues (getRcvQueues),
+  ( TRcvQueues (getRcvQueues, getConnections),
     empty,
     clear,
     deleteConn,
     hasConn,
-    getConns,
     addQueue,
+    batchAddQueues,
     deleteQueue,
     getSessQueues,
     getDelSessQueues,
@@ -14,49 +16,85 @@ module Simplex.Messaging.Agent.TRcvQueues
 where
 
 import Control.Concurrent.STM
+import Data.Foldable (foldl')
+import Data.List.NonEmpty (NonEmpty (..), (<|))
+import qualified Data.List.NonEmpty as L
 import qualified Data.Map.Strict as M
-import Data.Set (Set)
-import qualified Data.Set as S
 import Simplex.Messaging.Agent.Protocol (ConnId, UserId)
-import Simplex.Messaging.Agent.Store (RcvQueue (..))
+import Simplex.Messaging.Agent.Store (RcvQueue, StoredRcvQueue (..))
 import Simplex.Messaging.Protocol (RecipientId, SMPServer)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 
-newtype TRcvQueues = TRcvQueues {getRcvQueues :: TMap (UserId, SMPServer, RecipientId) RcvQueue}
+-- the fields in this record have the same data with swapped keys for lookup efficiency,
+-- and all methods must maintain this invariant.
+data TRcvQueues = TRcvQueues
+  { getRcvQueues :: TMap (UserId, SMPServer, RecipientId) RcvQueue,
+    getConnections :: TMap ConnId (NonEmpty (UserId, SMPServer, RecipientId))
+  }
 
 empty :: STM TRcvQueues
-empty = TRcvQueues <$> TM.empty
+empty = TRcvQueues <$> TM.empty <*> TM.empty
 
 clear :: TRcvQueues -> STM ()
-clear (TRcvQueues qs) = TM.clear qs
+clear (TRcvQueues qs cs) = TM.clear qs >> TM.clear cs
 
 deleteConn :: ConnId -> TRcvQueues -> STM ()
-deleteConn cId (TRcvQueues qs) = modifyTVar' qs $ M.filter (\rq -> cId /= connId rq)
+deleteConn cId (TRcvQueues qs cs) =
+  TM.lookupDelete cId cs >>= \case
+    Just ks -> modifyTVar' qs $ \qs' -> foldl' (flip M.delete) qs' ks
+    Nothing -> pure ()
 
 hasConn :: ConnId -> TRcvQueues -> STM Bool
-hasConn cId (TRcvQueues qs) = any (\rq -> cId == connId rq) <$> readTVar qs
-
-getConns :: TRcvQueues -> STM (Set ConnId)
-getConns (TRcvQueues qs) = M.foldr' (S.insert . connId) S.empty <$> readTVar qs
+hasConn cId (TRcvQueues _ cs) = TM.member cId cs
 
 addQueue :: RcvQueue -> TRcvQueues -> STM ()
-addQueue rq (TRcvQueues qs) = TM.insert (qKey rq) rq qs
+addQueue rq (TRcvQueues qs cs) = do
+  TM.insert k rq qs
+  TM.alter addQ (connId rq) cs
+  where
+    addQ = Just . maybe (k :| []) (k <|)
+    k = qKey rq
+
+-- Save time by aggregating modifyTVar
+batchAddQueues :: Foldable t => TRcvQueues -> t RcvQueue -> STM ()
+batchAddQueues (TRcvQueues qs cs) rqs = do
+  modifyTVar' qs $ \now -> foldl' (\rqs' rq -> M.insert (qKey rq) rq rqs') now rqs
+  modifyTVar' cs $ \now -> foldl' (\cs' rq -> M.alter (addQ $ qKey rq) (connId rq) cs') now rqs
+  where
+    addQ k = Just . maybe (k :| []) (k <|)
 
 deleteQueue :: RcvQueue -> TRcvQueues -> STM ()
-deleteQueue rq (TRcvQueues qs) = TM.delete (qKey rq) qs
+deleteQueue rq (TRcvQueues qs cs) = do
+  TM.delete k qs
+  TM.update delQ (connId rq) cs
+  where
+    delQ = L.nonEmpty . L.filter (/= k)
+    k = qKey rq
 
 getSessQueues :: (UserId, SMPServer, Maybe ConnId) -> TRcvQueues -> STM [RcvQueue]
-getSessQueues tSess (TRcvQueues qs) = M.foldl' addQ [] <$> readTVar qs
+getSessQueues tSess (TRcvQueues qs _) = M.foldl' addQ [] <$> readTVar qs
   where
     addQ qs' rq = if rq `isSession` tSess then rq : qs' else qs'
 
-getDelSessQueues :: (UserId, SMPServer, Maybe ConnId) -> TRcvQueues -> STM [RcvQueue]
-getDelSessQueues tSess (TRcvQueues qs) = stateTVar qs $ M.foldl' addQ ([], M.empty)
+getDelSessQueues :: (UserId, SMPServer, Maybe ConnId) -> TRcvQueues -> STM ([RcvQueue], [ConnId])
+getDelSessQueues tSess (TRcvQueues qs cs) = do
+  (removedQs, qs'') <- (\qs' -> M.foldl' delQ ([], qs') qs') <$> readTVar qs
+  writeTVar qs $! qs''
+  removedConns <- stateTVar cs $ \cs' -> foldl' delConn ([], cs') removedQs
+  pure (removedQs, removedConns)
   where
-    addQ (removed, qs') rq
-      | rq `isSession` tSess = (rq : removed, qs')
-      | otherwise = (removed, M.insert (qKey rq) rq qs')
+    delQ acc@(removed, qs') rq
+      | rq `isSession` tSess = (rq : removed, M.delete (qKey rq) qs')
+      | otherwise = acc
+    delConn (removed, cs') rq = M.alterF f cId cs'
+      where
+        cId = connId rq
+        f = \case
+          Just ks -> case L.nonEmpty $ L.filter (qKey rq /=) ks of
+            Just ks' -> (removed, Just ks')
+            Nothing -> (cId : removed, Nothing)
+          Nothing -> (removed, Nothing) -- "impossible" in invariant holds, because we get keys from the known queues
 
 isSession :: RcvQueue -> (UserId, SMPServer, Maybe ConnId) -> Bool
 isSession rq (uId, srv, connId_) =

src/Simplex/Messaging/Client.hs

@@ -28,7 +28,7 @@
 module Simplex.Messaging.Client
   ( -- * Connect (disconnect) client to (from) SMP server
     TransportSession,
-    ProtocolClient (thVersion, sessionId, sessionTs),
+    ProtocolClient (thParams, sessionTs),
     SMPClient,
     getProtocolClient,
     closeProtocolClient,
@@ -63,6 +63,7 @@ module Simplex.Messaging.Client
     NetworkConfig (..),
     TransportSessionMode (..),
     defaultClientConfig,
+    defaultSMPClientConfig,
     defaultNetworkConfig,
     transportClientConfig,
     chooseTransportHost,
@@ -72,11 +73,10 @@ module Simplex.Messaging.Client
     ClientCommand,
 
     -- * For testing
-    ClientBatch (..),
     PCTransmission,
-    batchClientTransmissions,
     mkTransmission,
-    clientStub,
+    authTransmission,
+    smpClientStub,
   )
 where
 
@@ -85,7 +85,9 @@ import Control.Concurrent.STM
 import Control.Exception
 import Control.Monad
 import Control.Monad.IO.Class (liftIO)
+import Control.Monad.Except
 import Control.Monad.Trans.Except
+import Crypto.Random (ChaChaDRG)
 import qualified Data.Aeson.TH as J
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
@@ -99,10 +101,9 @@ import Data.Time.Clock (UTCTime, getCurrentTime)
 import Network.Socket (ServiceName)
 import Numeric.Natural
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (defaultJSON, dropPrefix, enumJSON)
-import Simplex.Messaging.Protocol as SMP
+import Simplex.Messaging.Protocol
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
@@ -116,47 +117,47 @@ import System.Timeout (timeout)
 -- | 'SMPClient' is a handle used to send commands to a specific SMP server.
 --
 -- Use 'getSMPClient' to connect to an SMP server and create a client handle.
-data ProtocolClient err msg = ProtocolClient
+data ProtocolClient v err msg = ProtocolClient
   { action :: Maybe (Async ()),
-    sessionId :: SessionId,
+    thParams :: THandleParams v,
     sessionTs :: UTCTime,
-    thVersion :: Version,
-    timeoutPerBlock :: Int,
-    blockSize :: Int,
-    batch :: Bool,
-    client_ :: PClient err msg
+    client_ :: PClient v err msg
   }
 
-data PClient err msg = PClient
+data PClient v err msg = PClient
   { connected :: TVar Bool,
     transportSession :: TransportSession msg,
     transportHost :: TransportHost,
     tcpTimeout :: Int,
     batchDelay :: Maybe Int,
     pingErrorCount :: TVar Int,
-    clientCorrId :: TVar Natural,
+    clientCorrId :: TVar ChaChaDRG,
     sentCommands :: TMap CorrId (Request err msg),
     sndQ :: TBQueue ByteString,
     rcvQ :: TBQueue (NonEmpty (SignedTransmission err msg)),
-    msgQ :: Maybe (TBQueue (ServerTransmission msg))
+    msgQ :: Maybe (TBQueue (ServerTransmission v msg))
   }
 
-clientStub :: ByteString -> STM (ProtocolClient err msg)
-clientStub sessionId = do
+smpClientStub :: TVar ChaChaDRG -> ByteString -> VersionSMP -> Maybe THandleAuth -> STM (ProtocolClient SMPVersion err msg)
+smpClientStub g sessionId thVersion thAuth = do
   connected <- newTVar False
-  clientCorrId <- newTVar 0
+  clientCorrId <- C.newRandomDRG g
   sentCommands <- TM.empty
   sndQ <- newTBQueue 100
   rcvQ <- newTBQueue 100
   return
     ProtocolClient
       { action = Nothing,
-        sessionId,
+        thParams =
+          THandleParams
+            { sessionId,
+              thVersion,
+              thAuth,
+              blockSize = smpBlockSize,
+              implySessId = thVersion >= authCmdsSMPVersion,
+              batch = True
+            },
         sessionTs = undefined,
-        thVersion = 5,
-        timeoutPerBlock = undefined,
-        blockSize = smpBlockSize,
-        batch = undefined,
         client_ =
           PClient
             { connected,
@@ -173,13 +174,13 @@ clientStub sessionId = do
             }
       }
 
-type SMPClient = ProtocolClient ErrorType SMP.BrokerMsg
+type SMPClient = ProtocolClient SMPVersion ErrorType BrokerMsg
 
 -- | Type for client command data
-type ClientCommand msg = (Maybe C.APrivateSignKey, EntityId, ProtoCommand msg)
+type ClientCommand msg = (Maybe C.APrivateAuthKey, EntityId, ProtoCommand msg)
 
 -- | Type synonym for transmission from some SPM server queue.
-type ServerTransmission msg = (TransportSession msg, Version, SessionId, EntityId, msg)
+type ServerTransmission v msg = (TransportSession msg, Version v, SessionId, EntityId, msg)
 
 data HostMode
   = -- | prefer (or require) onion hosts when connecting via SOCKS proxy
@@ -240,7 +241,7 @@ transportClientConfig NetworkConfig {socksProxy, tcpKeepAlive, logTLSErrors} =
   TransportClientConfig {socksProxy, tcpKeepAlive, logTLSErrors, clientCredentials = Nothing}
 
 -- | protocol client configuration.
-data ProtocolClientConfig = ProtocolClientConfig
+data ProtocolClientConfig v = ProtocolClientConfig
   { -- | size of TBQueue to use for server commands and responses
     qSize :: Natural,
     -- | default server port if port is not specified in ProtocolServer
@@ -248,22 +249,25 @@ data ProtocolClientConfig = ProtocolClientConfig
     -- | network configuration
     networkConfig :: NetworkConfig,
     -- | client-server protocol version range
-    serverVRange :: VersionRange,
+    serverVRange :: VersionRange v,
     -- | delay between sending batches of commands (microseconds)
     batchDelay :: Maybe Int
   }
 
 -- | Default protocol client configuration.
-defaultClientConfig :: ProtocolClientConfig
-defaultClientConfig =
+defaultClientConfig :: VersionRange v -> ProtocolClientConfig v
+defaultClientConfig serverVRange =
   ProtocolClientConfig
     { qSize = 64,
       defaultTransport = ("443", transport @TLS),
       networkConfig = defaultNetworkConfig,
-      serverVRange = supportedSMPServerVRange,
+      serverVRange,
       batchDelay = Nothing
     }
 
+defaultSMPClientConfig :: ProtocolClientConfig SMPVersion
+defaultSMPClientConfig = defaultClientConfig supportedClientSMPRelayVRange
+
 data Request err msg = Request
   { entityId :: EntityId,
     responseVar :: TMVar (Either (ProtocolClientError err) msg)
@@ -288,15 +292,15 @@ chooseTransportHost NetworkConfig {socksProxy, hostMode, requiredHostMode} hosts
     onionHost = find isOnionHost hosts
     publicHost = find (not . isOnionHost) hosts
 
-protocolClientServer :: ProtocolTypeI (ProtoType msg) => ProtocolClient err msg -> String
+protocolClientServer :: ProtocolTypeI (ProtoType msg) => ProtocolClient v err msg -> String
 protocolClientServer = B.unpack . strEncode . snd3 . transportSession . client_
   where
     snd3 (_, s, _) = s
 
-transportHost' :: ProtocolClient err msg -> TransportHost
+transportHost' :: ProtocolClient v err msg -> TransportHost
 transportHost' = transportHost . client_
 
-transportSession' :: ProtocolClient err msg -> TransportSession msg
+transportSession' :: ProtocolClient v err msg -> TransportSession msg
 transportSession' = transportSession . client_
 
 type UserId = Int64
@@ -309,20 +313,20 @@ type TransportSession msg = (UserId, ProtoServer msg, Maybe EntityId)
 --
 -- A single queue can be used for multiple 'SMPClient' instances,
 -- as 'SMPServerTransmission' includes server information.
-getProtocolClient :: forall err msg. Protocol err msg => TransportSession msg -> ProtocolClientConfig -> Maybe (TBQueue (ServerTransmission msg)) -> (ProtocolClient err msg -> IO ()) -> IO (Either (ProtocolClientError err) (ProtocolClient err msg))
-getProtocolClient transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize, networkConfig, serverVRange, batchDelay} msgQ disconnected = do
+getProtocolClient :: forall v err msg. Protocol v err msg => TVar ChaChaDRG -> TransportSession msg -> ProtocolClientConfig v -> Maybe (TBQueue (ServerTransmission v msg)) -> (ProtocolClient v err msg -> IO ()) -> IO (Either (ProtocolClientError err) (ProtocolClient v err msg))
+getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize, networkConfig, serverVRange, batchDelay} msgQ disconnected = do
   case chooseTransportHost networkConfig (host srv) of
     Right useHost ->
       (atomically (mkProtocolClient useHost) >>= runClient useTransport useHost)
         `catch` \(e :: IOException) -> pure . Left $ PCEIOError e
     Left e -> pure $ Left e
   where
-    NetworkConfig {tcpConnectTimeout, tcpTimeout, tcpTimeoutPerKb, smpPingInterval} = networkConfig
-    mkProtocolClient :: TransportHost -> STM (PClient err msg)
+    NetworkConfig {tcpConnectTimeout, tcpTimeout, smpPingInterval} = networkConfig
+    mkProtocolClient :: TransportHost -> STM (PClient v err msg)
     mkProtocolClient transportHost = do
       connected <- newTVar False
       pingErrorCount <- newTVar 0
-      clientCorrId <- newTVar 0
+      clientCorrId <- C.newRandomDRG g
       sentCommands <- TM.empty
       sndQ <- newTBQueue qSize
       rcvQ <- newTBQueue qSize
@@ -341,7 +345,7 @@ getProtocolClient transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize,
             msgQ
           }
 
-    runClient :: (ServiceName, ATransport) -> TransportHost -> PClient err msg -> IO (Either (ProtocolClientError err) (ProtocolClient err msg))
+    runClient :: (ServiceName, ATransport) -> TransportHost -> PClient v err msg -> IO (Either (ProtocolClientError err) (ProtocolClient v err msg))
     runClient (port', ATransport t) useHost c = do
       cVar <- newEmptyTMVarIO
       let tcConfig = transportClientConfig networkConfig
@@ -349,12 +353,12 @@ getProtocolClient transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize,
       action <-
         async $
           runTransportClient tcConfig (Just username) useHost port' (Just $ keyHash srv) (client t c cVar)
-            `finally` atomically (putTMVar cVar $ Left PCENetworkError)
+            `finally` atomically (tryPutTMVar cVar $ Left PCENetworkError)
       c_ <- tcpConnectTimeout `timeout` atomically (takeTMVar cVar)
-      pure $ case c_ of
-        Just (Right c') -> Right c' {action = Just action}
-        Just (Left e) -> Left e
-        Nothing -> Left PCENetworkError
+      case c_ of
+        Just (Right c') -> pure $ Right c' {action = Just action}
+        Just (Left e) -> pure $ Left e
+        Nothing -> cancel action $> Left PCENetworkError
 
     useTransport :: (ServiceName, ATransport)
     useTransport = case port srv of
@@ -362,30 +366,30 @@ getProtocolClient transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize,
       "80" -> ("80", transport @WS)
       p -> (p, transport @TLS)
 
-    client :: forall c. Transport c => TProxy c -> PClient err msg -> TMVar (Either (ProtocolClientError err) (ProtocolClient err msg)) -> c -> IO ()
-    client _ c cVar h =
-      runExceptT (protocolClientHandshake @err @msg h (keyHash srv) serverVRange) >>= \case
+    client :: forall c. Transport c => TProxy c -> PClient v err msg -> TMVar (Either (ProtocolClientError err) (ProtocolClient v err msg)) -> c -> IO ()
+    client _ c cVar h = do
+      ks <- atomically $ C.generateKeyPair g
+      runExceptT (protocolClientHandshake @v @err @msg h ks (keyHash srv) serverVRange) >>= \case
         Left e -> atomically . putTMVar cVar . Left $ PCETransportError e
-        Right th@THandle {sessionId, thVersion, blockSize, batch} -> do
+        Right th@THandle {params} -> do
           sessionTs <- getCurrentTime
-          let timeoutPerBlock = (blockSize * tcpTimeoutPerKb) `div` 1024
-              c' = ProtocolClient {action = Nothing, client_ = c, sessionId, thVersion, sessionTs, timeoutPerBlock, blockSize, batch}
+          let c' = ProtocolClient {action = Nothing, client_ = c, thParams = params, sessionTs}
           atomically $ do
             writeTVar (connected c) True
             putTMVar cVar $ Right c'
           raceAny_ ([send c' th, process c', receive c' th] <> [ping c' | smpPingInterval > 0])
             `finally` disconnected c'
 
-    send :: Transport c => ProtocolClient err msg -> THandle c -> IO ()
+    send :: Transport c => ProtocolClient v err msg -> THandle v c -> IO ()
     send ProtocolClient {client_ = PClient {sndQ}} h = forever $ atomically (readTBQueue sndQ) >>= tPutLog h
 
-    receive :: Transport c => ProtocolClient err msg -> THandle c -> IO ()
+    receive :: Transport c => ProtocolClient v err msg -> THandle v c -> IO ()
     receive ProtocolClient {client_ = PClient {rcvQ}} h = forever $ tGet h >>= atomically . writeTBQueue rcvQ
 
-    ping :: ProtocolClient err msg -> IO ()
+    ping :: ProtocolClient v err msg -> IO ()
     ping c@ProtocolClient {client_ = PClient {pingErrorCount}} = do
       threadDelay' smpPingInterval
-      runExceptT (sendProtocolCommand c Nothing "" $ protocolPing @err @msg) >>= \case
+      runExceptT (sendProtocolCommand c Nothing "" $ protocolPing @v @err @msg) >>= \case
         Left PCEResponseTimeout -> do
           cnt <- atomically $ stateTVar pingErrorCount $ \cnt -> (cnt + 1, cnt + 1)
           when (maxCnt == 0 || cnt < maxCnt) $ ping c
@@ -393,10 +397,10 @@ getProtocolClient transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize,
       where
         maxCnt = smpPingCount networkConfig
 
-    process :: ProtocolClient err msg -> IO ()
+    process :: ProtocolClient v err msg -> IO ()
     process c = forever $ atomically (readTBQueue $ rcvQ $ client_ c) >>= mapM_ (processMsg c)
 
-    processMsg :: ProtocolClient err msg -> SignedTransmission err msg -> IO ()
+    processMsg :: ProtocolClient v err msg -> SignedTransmission err msg -> IO ()
     processMsg c@ProtocolClient {client_ = PClient {sentCommands}} (_, _, (corrId, entId, respOrErr)) =
       if B.null $ bs corrId
         then sendMsg respOrErr
@@ -424,7 +428,7 @@ proxyUsername :: TransportSession msg -> ByteString
 proxyUsername (userId, _, entityId_) = C.sha256Hash $ bshow userId <> maybe "" (":" <>) entityId_
 
 -- | Disconnects client from the server and terminates client threads.
-closeProtocolClient :: ProtocolClient err msg -> IO ()
+closeProtocolClient :: ProtocolClient v err msg -> IO ()
 closeProtocolClient = mapM_ uninterruptibleCancel . action
 
 -- | SMP client error type.
@@ -471,13 +475,12 @@ temporaryClientError = \case
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#create-queue-command
 createSMPQueue ::
   SMPClient ->
-  RcvPrivateSignKey ->
-  RcvPublicVerifyKey ->
+  C.AAuthKeyPair -> -- SMP v6 - signature key pair, SMP v7 - DH key pair
   RcvPublicDhKey ->
   Maybe BasicAuth ->
   SubscriptionMode ->
   ExceptT SMPClientError IO QueueIdsKeys
-createSMPQueue c rpKey rKey dhKey auth subMode =
+createSMPQueue c (rKey, rpKey) dhKey auth subMode =
   sendSMPCommand c (Just rpKey) "" (NEW rKey dhKey auth subMode) >>= \case
     IDS qik -> pure qik
     r -> throwE . PCEUnexpectedResponse $ bshow r
@@ -485,7 +488,7 @@ createSMPQueue c rpKey rKey dhKey auth subMode =
 -- | Subscribe to the SMP queue.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#subscribe-to-queue
-subscribeSMPQueue :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT SMPClientError IO ()
+subscribeSMPQueue :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> ExceptT SMPClientError IO ()
 subscribeSMPQueue c rpKey rId =
   sendSMPCommand c (Just rpKey) rId SUB >>= \case
     OK -> return ()
@@ -493,12 +496,12 @@ subscribeSMPQueue c rpKey rId =
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
 -- | Subscribe to multiple SMP queues batching commands if supported.
-subscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
+subscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
 subscribeSMPQueues c qs = sendProtocolCommands c cs >>= mapM (processSUBResponse c)
   where
     cs = L.map (\(rpKey, rId) -> (Just rpKey, rId, Cmd SRecipient SUB)) qs
 
-streamSubscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> ([(RecipientId, Either SMPClientError ())] -> IO ()) -> IO ()
+streamSubscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> ([(RecipientId, Either SMPClientError ())] -> IO ()) -> IO ()
 streamSubscribeSMPQueues c qs cb = streamProtocolCommands c cs $ mapM process >=> cb
   where
     cs = L.map (\(rpKey, rId) -> (Just rpKey, rId, Cmd SRecipient SUB)) qs
@@ -514,14 +517,14 @@ processSUBResponse c (Response rId r) = case r of
 writeSMPMessage :: SMPClient -> RecipientId -> BrokerMsg -> IO ()
 writeSMPMessage c rId msg = atomically $ mapM_ (`writeTBQueue` serverTransmission c rId msg) (msgQ $ client_ c)
 
-serverTransmission :: ProtocolClient err msg -> RecipientId -> msg -> ServerTransmission msg
-serverTransmission ProtocolClient {thVersion, sessionId, client_ = PClient {transportSession}} entityId message =
+serverTransmission :: ProtocolClient v err msg -> RecipientId -> msg -> ServerTransmission v msg
+serverTransmission ProtocolClient {thParams = THandleParams {thVersion, sessionId}, client_ = PClient {transportSession}} entityId message =
   (transportSession, thVersion, sessionId, entityId, message)
 
 -- | Get message from SMP queue. The server returns ERR PROHIBITED if a client uses SUB and GET via the same transport connection for the same queue
 --
 -- https://github.covm/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#receive-a-message-from-the-queue
-getSMPMessage :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT SMPClientError IO (Maybe RcvMessage)
+getSMPMessage :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> ExceptT SMPClientError IO (Maybe RcvMessage)
 getSMPMessage c rpKey rId =
   sendSMPCommand c (Just rpKey) rId GET >>= \case
     OK -> pure Nothing
@@ -531,30 +534,30 @@ getSMPMessage c rpKey rId =
 -- | Subscribe to the SMP queue notifications.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#subscribe-to-queue-notifications
-subscribeSMPQueueNotifications :: SMPClient -> NtfPrivateSignKey -> NotifierId -> ExceptT SMPClientError IO ()
+subscribeSMPQueueNotifications :: SMPClient -> NtfPrivateAuthKey -> NotifierId -> ExceptT SMPClientError IO ()
 subscribeSMPQueueNotifications = okSMPCommand NSUB
 
 -- | Subscribe to multiple SMP queues notifications batching commands if supported.
-subscribeSMPQueuesNtfs :: SMPClient -> NonEmpty (NtfPrivateSignKey, NotifierId) -> IO (NonEmpty (Either SMPClientError ()))
+subscribeSMPQueuesNtfs :: SMPClient -> NonEmpty (NtfPrivateAuthKey, NotifierId) -> IO (NonEmpty (Either SMPClientError ()))
 subscribeSMPQueuesNtfs = okSMPCommands NSUB
 
 -- | Secure the SMP queue by adding a sender public key.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#secure-queue-command
-secureSMPQueue :: SMPClient -> RcvPrivateSignKey -> RecipientId -> SndPublicVerifyKey -> ExceptT SMPClientError IO ()
+secureSMPQueue :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> SndPublicAuthKey -> ExceptT SMPClientError IO ()
 secureSMPQueue c rpKey rId senderKey = okSMPCommand (KEY senderKey) c rpKey rId
 
 -- | Enable notifications for the queue for push notifications server.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#enable-notifications-command
-enableSMPQueueNotifications :: SMPClient -> RcvPrivateSignKey -> RecipientId -> NtfPublicVerifyKey -> RcvNtfPublicDhKey -> ExceptT SMPClientError IO (NotifierId, RcvNtfPublicDhKey)
+enableSMPQueueNotifications :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> NtfPublicAuthKey -> RcvNtfPublicDhKey -> ExceptT SMPClientError IO (NotifierId, RcvNtfPublicDhKey)
 enableSMPQueueNotifications c rpKey rId notifierKey rcvNtfPublicDhKey =
   sendSMPCommand c (Just rpKey) rId (NKEY notifierKey rcvNtfPublicDhKey) >>= \case
     NID nId rcvNtfSrvPublicDhKey -> pure (nId, rcvNtfSrvPublicDhKey)
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
 -- | Enable notifications for the multiple queues for push notifications server.
-enableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId, NtfPublicVerifyKey, RcvNtfPublicDhKey) -> IO (NonEmpty (Either SMPClientError (NotifierId, RcvNtfPublicDhKey)))
+enableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId, NtfPublicAuthKey, RcvNtfPublicDhKey) -> IO (NonEmpty (Either SMPClientError (NotifierId, RcvNtfPublicDhKey)))
 enableSMPQueuesNtfs c qs = L.map process <$> sendProtocolCommands c cs
   where
     cs = L.map (\(rpKey, rId, notifierKey, rcvNtfPublicDhKey) -> (Just rpKey, rId, Cmd SRecipient $ NKEY notifierKey rcvNtfPublicDhKey)) qs
@@ -566,17 +569,17 @@ enableSMPQueuesNtfs c qs = L.map process <$> sendProtocolCommands c cs
 -- | Disable notifications for the queue for push notifications server.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#disable-notifications-command
-disableSMPQueueNotifications :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT SMPClientError IO ()
+disableSMPQueueNotifications :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> ExceptT SMPClientError IO ()
 disableSMPQueueNotifications = okSMPCommand NDEL
 
 -- | Disable notifications for multiple queues for push notifications server.
-disableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
+disableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
 disableSMPQueuesNtfs = okSMPCommands NDEL
 
 -- | Send SMP message.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#send-message
-sendSMPMessage :: SMPClient -> Maybe SndPrivateSignKey -> SenderId -> MsgFlags -> MsgBody -> ExceptT SMPClientError IO ()
+sendSMPMessage :: SMPClient -> Maybe SndPrivateAuthKey -> SenderId -> MsgFlags -> MsgBody -> ExceptT SMPClientError IO ()
 sendSMPMessage c spKey sId flags msg =
   sendSMPCommand c spKey sId (SEND flags msg) >>= \case
     OK -> pure ()
@@ -585,7 +588,7 @@ sendSMPMessage c spKey sId flags msg =
 -- | Acknowledge message delivery (server deletes the message).
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#acknowledge-message-delivery
-ackSMPMessage :: SMPClient -> RcvPrivateSignKey -> QueueId -> MsgId -> ExceptT SMPClientError IO ()
+ackSMPMessage :: SMPClient -> RcvPrivateAuthKey -> QueueId -> MsgId -> ExceptT SMPClientError IO ()
 ackSMPMessage c rpKey rId msgId =
   sendSMPCommand c (Just rpKey) rId (ACK msgId) >>= \case
     OK -> return ()
@@ -596,26 +599,26 @@ ackSMPMessage c rpKey rId msgId =
 -- The existing messages from the queue will still be delivered.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#suspend-queue
-suspendSMPQueue :: SMPClient -> RcvPrivateSignKey -> QueueId -> ExceptT SMPClientError IO ()
+suspendSMPQueue :: SMPClient -> RcvPrivateAuthKey -> QueueId -> ExceptT SMPClientError IO ()
 suspendSMPQueue = okSMPCommand OFF
 
 -- | Irreversibly delete SMP queue and all messages in it.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#delete-queue
-deleteSMPQueue :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT SMPClientError IO ()
+deleteSMPQueue :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> ExceptT SMPClientError IO ()
 deleteSMPQueue = okSMPCommand DEL
 
 -- | Delete multiple SMP queues batching commands if supported.
-deleteSMPQueues :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
+deleteSMPQueues :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
 deleteSMPQueues = okSMPCommands DEL
 
-okSMPCommand :: PartyI p => Command p -> SMPClient -> C.APrivateSignKey -> QueueId -> ExceptT SMPClientError IO ()
+okSMPCommand :: PartyI p => Command p -> SMPClient -> C.APrivateAuthKey -> QueueId -> ExceptT SMPClientError IO ()
 okSMPCommand cmd c pKey qId =
   sendSMPCommand c (Just pKey) qId cmd >>= \case
     OK -> return ()
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
-okSMPCommands :: PartyI p => Command p -> SMPClient -> NonEmpty (C.APrivateSignKey, QueueId) -> IO (NonEmpty (Either SMPClientError ()))
+okSMPCommands :: PartyI p => Command p -> SMPClient -> NonEmpty (C.APrivateAuthKey, QueueId) -> IO (NonEmpty (Either SMPClientError ()))
 okSMPCommands cmd c qs = L.map process <$> sendProtocolCommands c cs
   where
     aCmd = Cmd sParty cmd
@@ -626,15 +629,15 @@ okSMPCommands cmd c qs = L.map process <$> sendProtocolCommands c cs
       Left e -> Left e
 
 -- | Send SMP command
-sendSMPCommand :: PartyI p => SMPClient -> Maybe C.APrivateSignKey -> QueueId -> Command p -> ExceptT SMPClientError IO BrokerMsg
+sendSMPCommand :: PartyI p => SMPClient -> Maybe C.APrivateAuthKey -> QueueId -> Command p -> ExceptT SMPClientError IO BrokerMsg
 sendSMPCommand c pKey qId cmd = sendProtocolCommand c pKey qId (Cmd sParty cmd)
 
-type PCTransmission err msg = (SentRawTransmission, Request err msg)
+type PCTransmission err msg = (Either TransportError SentRawTransmission, Request err msg)
 
 -- | Send multiple commands with batching and collect responses
-sendProtocolCommands :: forall err msg. ProtocolEncoding err (ProtoCommand msg) => ProtocolClient err msg -> NonEmpty (ClientCommand msg) -> IO (NonEmpty (Response err msg))
-sendProtocolCommands c@ProtocolClient {batch, blockSize} cs = do
-  bs <- batchClientTransmissions batch blockSize <$> mapM (mkTransmission c) cs
+sendProtocolCommands :: forall v err msg. ProtocolEncoding v err (ProtoCommand msg) => ProtocolClient v err msg -> NonEmpty (ClientCommand msg) -> IO (NonEmpty (Response err msg))
+sendProtocolCommands c@ProtocolClient {thParams = THandleParams {batch, blockSize}} cs = do
+  bs <- batchTransmissions' batch blockSize <$> mapM (mkTransmission c) cs
   validate . concat =<< mapM (sendBatch c) bs
   where
     validate :: [Response err msg] -> IO (NonEmpty (Response err msg))
@@ -649,77 +652,45 @@ sendProtocolCommands c@ProtocolClient {batch, blockSize} cs = do
       where
         diff = L.length cs - length rs
 
-streamProtocolCommands :: forall err msg. ProtocolEncoding err (ProtoCommand msg) => ProtocolClient err msg -> NonEmpty (ClientCommand msg) -> ([Response err msg] -> IO ()) -> IO ()
-streamProtocolCommands c@ProtocolClient {batch, blockSize} cs cb = do
-  bs <- batchClientTransmissions batch blockSize <$> mapM (mkTransmission c) cs
+streamProtocolCommands :: forall v err msg. ProtocolEncoding v err (ProtoCommand msg) => ProtocolClient v err msg -> NonEmpty (ClientCommand msg) -> ([Response err msg] -> IO ()) -> IO ()
+streamProtocolCommands c@ProtocolClient {thParams = THandleParams {batch, blockSize}} cs cb = do
+  bs <- batchTransmissions' batch blockSize <$> mapM (mkTransmission c) cs
   mapM_ (cb <=< sendBatch c) bs
 
-sendBatch :: ProtocolClient err msg -> ClientBatch err msg -> IO [Response err msg]
+sendBatch :: ProtocolClient v err msg -> TransportBatch (Request err msg) -> IO [Response err msg]
 sendBatch c@ProtocolClient {client_ = PClient {sndQ}} b = do
   case b of
-    CBLargeTransmission Request {entityId} -> do
+    TBError e Request {entityId} -> do
       putStrLn "send error: large message"
-      pure [Response entityId $ Left $ PCETransportError TELargeMsg]
-    CBTransmissions s n rs -> do
-      when (n > 0) $ atomically $ writeTBQueue sndQ $ tEncodeBatch n s
-      mapConcurrently (getResponse c) rs
-    CBTransmission s r -> do
+      pure [Response entityId $ Left $ PCETransportError e]
+    TBTransmissions s n rs
+      | n > 0 -> do
+          atomically $ writeTBQueue sndQ s
+          mapConcurrently (getResponse c) rs
+      | otherwise -> pure []
+    TBTransmission s r -> do
       atomically $ writeTBQueue sndQ s
       (: []) <$> getResponse c r
 
-data ClientBatch err msg
-  = -- ByteString in CBTransmissions does not include count byte, it is added by tEncodeBatch
-    CBTransmissions ByteString Int [Request err msg]
-  | CBTransmission ByteString (Request err msg)
-  | CBLargeTransmission (Request err msg)
-
--- | encodes and batches transmissions into blocks
-batchClientTransmissions :: forall err msg. Bool -> Int -> NonEmpty (PCTransmission err msg) -> [ClientBatch err msg]
-batchClientTransmissions batch blkSize
-  | batch = reverse . mkBatch []
-  | otherwise = map mkBatch1 . L.toList
-  where
-    mkBatch :: [ClientBatch err msg] -> NonEmpty (PCTransmission err msg) -> [ClientBatch err msg]
-    mkBatch bs ts =
-      let (b, ts_) = encodeBatch "" 0 [] ts
-          bs' = b : bs
-       in maybe bs' (mkBatch bs') ts_
-    mkBatch1 :: PCTransmission err msg -> ClientBatch err msg
-    mkBatch1 (t, r)
-      | B.length s <= blkSize - 2 = CBTransmission s r
-      | otherwise = CBLargeTransmission r
-      where
-        s = tEncode t
-    encodeBatch :: ByteString -> Int -> [Request err msg] -> NonEmpty (PCTransmission err msg) -> (ClientBatch err msg, Maybe (NonEmpty (PCTransmission err msg)))
-    encodeBatch s n rs ts@((t, r) :| ts_)
-      | B.length s' <= blkSize - 3 && n < 255 =
-          case L.nonEmpty ts_ of
-            Just ts' -> encodeBatch s' n' rs' ts'
-            Nothing -> (CBTransmissions s' n' (reverse rs'), Nothing)
-      | n == 0 = (CBLargeTransmission r, L.nonEmpty ts_)
-      | otherwise = (CBTransmissions s n (reverse rs), Just ts)
-      where
-        s' = s <> smpEncode (Large $ tEncode t)
-        n' = n + 1
-        rs' = r : rs
-
 -- | Send Protocol command
-sendProtocolCommand :: forall err msg. ProtocolEncoding err (ProtoCommand msg) => ProtocolClient err msg -> Maybe C.APrivateSignKey -> EntityId -> ProtoCommand msg -> ExceptT (ProtocolClientError err) IO msg
-sendProtocolCommand c@ProtocolClient {client_ = PClient {sndQ}, batch, blockSize} pKey entId cmd =
+sendProtocolCommand :: forall v err msg. ProtocolEncoding v err (ProtoCommand msg) => ProtocolClient v err msg -> Maybe C.APrivateAuthKey -> EntityId -> ProtoCommand msg -> ExceptT (ProtocolClientError err) IO msg
+sendProtocolCommand c@ProtocolClient {client_ = PClient {sndQ}, thParams = THandleParams {batch, blockSize}} pKey entId cmd =
   ExceptT $ uncurry sendRecv =<< mkTransmission c (pKey, entId, cmd)
   where
     -- two separate "atomically" needed to avoid blocking
-    sendRecv :: SentRawTransmission -> Request err msg -> IO (Either (ProtocolClientError err) msg)
-    sendRecv t r
-      | B.length s > blockSize - 2 = pure $ Left $ PCETransportError TELargeMsg
-      | otherwise = atomically (writeTBQueue sndQ s) >> response <$> getResponse c r
-      where
-        s
-          | batch = tEncodeBatch 1 . smpEncode . Large $ tEncode t
-          | otherwise = tEncode t
+    sendRecv :: Either TransportError SentRawTransmission -> Request err msg -> IO (Either (ProtocolClientError err) msg)
+    sendRecv t_ r = case t_ of
+      Left e -> pure . Left $ PCETransportError e
+      Right t
+        | B.length s > blockSize - 2 -> pure . Left $ PCETransportError TELargeMsg
+        | otherwise -> atomically (writeTBQueue sndQ s) >> response <$> getResponse c r
+        where
+          s
+            | batch = tEncodeBatch1 t
+            | otherwise = tEncode t
 
 -- TODO switch to timeout or TimeManager that supports Int64
-getResponse :: ProtocolClient err msg -> Request err msg -> IO (Response err msg)
+getResponse :: ProtocolClient v err msg -> Request err msg -> IO (Response err msg)
 getResponse ProtocolClient {client_ = PClient {tcpTimeout, pingErrorCount}} Request {entityId, responseVar} = do
   response <-
     timeout tcpTimeout (atomically (takeTMVar responseVar)) >>= \case
@@ -727,25 +698,35 @@ getResponse ProtocolClient {client_ = PClient {tcpTimeout, pingErrorCount}} Requ
       Nothing -> pure $ Left PCEResponseTimeout
   pure Response {entityId, response}
 
-mkTransmission :: forall err msg. ProtocolEncoding err (ProtoCommand msg) => ProtocolClient err msg -> ClientCommand msg -> IO (PCTransmission err msg)
-mkTransmission ProtocolClient {sessionId, thVersion, client_ = PClient {clientCorrId, sentCommands}} (pKey, entId, cmd) = do
+mkTransmission :: forall v err msg. ProtocolEncoding v err (ProtoCommand msg) => ProtocolClient v err msg -> ClientCommand msg -> IO (PCTransmission err msg)
+mkTransmission ProtocolClient {thParams, client_ = PClient {clientCorrId, sentCommands}} (pKey_, entId, cmd) = do
   corrId <- atomically getNextCorrId
-  let t = signTransmission $ encodeTransmission thVersion sessionId (corrId, entId, cmd)
+  let TransmissionForAuth {tForAuth, tToSend} = encodeTransmissionForAuth thParams (corrId, entId, cmd)
+      auth = authTransmission (thAuth thParams) pKey_ corrId tForAuth
   r <- atomically $ mkRequest corrId
-  pure (t, r)
+  pure ((,tToSend) <$> auth, r)
   where
     getNextCorrId :: STM CorrId
-    getNextCorrId = do
-      i <- stateTVar clientCorrId $ \i -> (i, i + 1)
-      pure . CorrId $ bshow i
-    signTransmission :: ByteString -> SentRawTransmission
-    signTransmission t = ((`C.sign` t) <$> pKey, t)
+    getNextCorrId = CorrId <$> C.randomBytes 24 clientCorrId -- also used as nonce
     mkRequest :: CorrId -> STM (Request err msg)
     mkRequest corrId = do
       r <- Request entId <$> newEmptyTMVar
       TM.insert corrId r sentCommands
       pure r
 
+authTransmission :: Maybe THandleAuth -> Maybe C.APrivateAuthKey -> CorrId -> ByteString -> Either TransportError (Maybe TransmissionAuth)
+authTransmission thAuth pKey_ (CorrId corrId) t = traverse authenticate pKey_
+  where
+    authenticate :: C.APrivateAuthKey -> Either TransportError TransmissionAuth
+    authenticate (C.APrivateAuthKey a pk) = case a of
+      C.SX25519 -> case thAuth of
+        Just THandleAuth {peerPubKey} -> Right $ TAAuthenticator $ C.cbAuthenticate peerPubKey pk (C.cbNonce corrId) t
+        Nothing -> Left TENoServerAuth
+      C.SEd25519 -> sign pk
+      C.SEd448 -> sign pk
+    sign :: forall a. (C.AlgorithmI a, C.SignatureAlgorithm a) => C.PrivateKey a -> Either TransportError TransmissionAuth
+    sign pk = Right $ TASignature $ C.ASignature (C.sAlgorithm @a) (C.sign' pk t)
+
 $(J.deriveJSON (enumJSON $ dropPrefix "HM") ''HostMode)
 
 $(J.deriveJSON (enumJSON $ dropPrefix "TSM") ''TransportSessionMode)

src/Simplex/Messaging/Client/Agent.hs

@@ -18,6 +18,7 @@ import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Unlift
 import Control.Monad.Trans.Except
+import Crypto.Random (ChaChaDRG)
 import Data.Bifunctor (bimap, first)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
@@ -36,7 +37,7 @@ import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Client
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (BrokerMsg, NotifierId, NtfPrivateSignKey, ProtocolServer (..), QueueId, RcvPrivateSignKey, RecipientId, SMPServer)
+import Simplex.Messaging.Protocol (BrokerMsg, NotifierId, NtfPrivateAuthKey, ProtocolServer (..), QueueId, RcvPrivateAuthKey, RecipientId, SMPServer)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
@@ -64,7 +65,7 @@ type SMPSub = (SMPSubParty, QueueId)
 -- type SMPServerSub = (SMPServer, SMPSub)
 
 data SMPClientAgentConfig = SMPClientAgentConfig
-  { smpCfg :: ProtocolClientConfig,
+  { smpCfg :: ProtocolClientConfig SMPVersion,
     reconnectInterval :: RetryInterval,
     msgQSize :: Natural,
     agentQSize :: Natural,
@@ -74,7 +75,7 @@ data SMPClientAgentConfig = SMPClientAgentConfig
 defaultSMPClientAgentConfig :: SMPClientAgentConfig
 defaultSMPClientAgentConfig =
   SMPClientAgentConfig
-    { smpCfg = defaultClientConfig {defaultTransport = ("5223", transport @TLS)},
+    { smpCfg = defaultSMPClientConfig {defaultTransport = ("5223", transport @TLS)},
       reconnectInterval =
         RetryInterval
           { initialInterval = second,
@@ -90,11 +91,12 @@ defaultSMPClientAgentConfig =
 
 data SMPClientAgent = SMPClientAgent
   { agentCfg :: SMPClientAgentConfig,
-    msgQ :: TBQueue (ServerTransmission BrokerMsg),
+    msgQ :: TBQueue (ServerTransmission SMPVersion BrokerMsg),
     agentQ :: TBQueue SMPClientAgentEvent,
+    randomDrg :: TVar ChaChaDRG,
     smpClients :: TMap SMPServer SMPClientVar,
-    srvSubs :: TMap SMPServer (TMap SMPSub C.APrivateSignKey),
-    pendingSrvSubs :: TMap SMPServer (TMap SMPSub C.APrivateSignKey),
+    srvSubs :: TMap SMPServer (TMap SMPSub C.APrivateAuthKey),
+    pendingSrvSubs :: TMap SMPServer (TMap SMPSub C.APrivateAuthKey),
     reconnections :: TVar [Async ()],
     asyncClients :: TVar [Async ()]
   }
@@ -111,8 +113,8 @@ instance (MonadUnliftIO m, Exception e) => MonadUnliftIO (ExceptT e m) where
       withRunInIO $ \run ->
         exceptToIO $ run . (either (E.throwIO . InternalException) return <=< runExceptT)
 
-newSMPClientAgent :: SMPClientAgentConfig -> STM SMPClientAgent
-newSMPClientAgent agentCfg@SMPClientAgentConfig {msgQSize, agentQSize} = do
+newSMPClientAgent :: SMPClientAgentConfig -> TVar ChaChaDRG -> STM SMPClientAgent
+newSMPClientAgent agentCfg@SMPClientAgentConfig {msgQSize, agentQSize} randomDrg = do
   msgQ <- newTBQueue msgQSize
   agentQ <- newTBQueue agentQSize
   smpClients <- TM.empty
@@ -120,10 +122,10 @@ newSMPClientAgent agentCfg@SMPClientAgentConfig {msgQSize, agentQSize} = do
   pendingSrvSubs <- TM.empty
   reconnections <- newTVar []
   asyncClients <- newTVar []
-  pure SMPClientAgent {agentCfg, msgQ, agentQ, smpClients, srvSubs, pendingSrvSubs, reconnections, asyncClients}
+  pure SMPClientAgent {agentCfg, msgQ, agentQ, randomDrg, smpClients, srvSubs, pendingSrvSubs, reconnections, asyncClients}
 
 getSMPServerClient' :: SMPClientAgent -> SMPServer -> ExceptT SMPClientError IO SMPClient
-getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
+getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ, randomDrg} srv =
   atomically getClientVar >>= either newSMPClient waitForSMPClient
   where
     getClientVar :: STM (Either SMPClientVar SMPClientVar)
@@ -171,14 +173,14 @@ getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
             void $ tryConnectClient (const reconnectClient) loop
 
     connectClient :: ExceptT SMPClientError IO SMPClient
-    connectClient = ExceptT $ getProtocolClient (1, srv, Nothing) (smpCfg agentCfg) (Just msgQ) clientDisconnected
+    connectClient = ExceptT $ getProtocolClient randomDrg (1, srv, Nothing) (smpCfg agentCfg) (Just msgQ) clientDisconnected
 
     clientDisconnected :: SMPClient -> IO ()
     clientDisconnected _ = do
       removeClientAndSubs >>= (`forM_` serverDown)
       logInfo . decodeUtf8 $ "Agent disconnected from " <> showServer srv
 
-    removeClientAndSubs :: IO (Maybe (Map SMPSub C.APrivateSignKey))
+    removeClientAndSubs :: IO (Maybe (Map SMPSub C.APrivateAuthKey))
     removeClientAndSubs = atomically $ do
       TM.delete srv smpClients
       TM.lookupDelete srv (srvSubs ca) >>= mapM updateSubs
@@ -194,7 +196,7 @@ getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
             Just v -> TM.union ss v
             _ -> TM.insert srv sVar ps
 
-    serverDown :: Map SMPSub C.APrivateSignKey -> IO ()
+    serverDown :: Map SMPSub C.APrivateAuthKey -> IO ()
     serverDown ss = unless (M.null ss) $ do
       notify . CADisconnected srv $ M.keysSet ss
       void $ runExceptT reconnectServer
@@ -224,15 +226,15 @@ getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
           SPNotifier -> True
           SPRecipient -> False
 
-        subscribe_ :: SMPClient -> SMPSubParty -> [(SMPSub, C.APrivateSignKey)] -> ExceptT SMPClientError IO ()
+        subscribe_ :: SMPClient -> SMPSubParty -> [(SMPSub, C.APrivateAuthKey)] -> ExceptT SMPClientError IO ()
         subscribe_ smp party = mapM_ subscribeBatch . toChunks (agentSubsBatchSize agentCfg)
           where
             subscribeBatch subs' = do
-              let subs'' :: (NonEmpty (QueueId, C.APrivateSignKey)) = L.map (first snd) subs'
+              let subs'' :: (NonEmpty (QueueId, C.APrivateAuthKey)) = L.map (first snd) subs'
               rs <- liftIO $ smpSubscribeQueues party ca smp srv subs''
-              let rs' :: (NonEmpty ((SMPSub, C.APrivateSignKey), Either SMPClientError ())) =
+              let rs' :: (NonEmpty ((SMPSub, C.APrivateAuthKey), Either SMPClientError ())) =
                     L.zipWith (first . const) subs' rs
-                  rs'' :: [Either (SMPSub, SMPClientError) (SMPSub, C.APrivateSignKey)] =
+                  rs'' :: [Either (SMPSub, SMPClientError) (SMPSub, C.APrivateAuthKey)] =
                     map (\(sub, r) -> bimap (fst sub,) (const sub) r) $ L.toList rs'
                   (errs, oks) = partitionEithers rs''
                   (tempErrs, finalErrs) = partition (temporaryClientError . snd) errs
@@ -270,7 +272,7 @@ withSMP ca srv action = (getSMPServerClient' ca srv >>= action) `catchE` logSMPE
       liftIO $ putStrLn $ "SMP error (" <> show srv <> "): " <> show e
       throwE e
 
-subscribeQueue :: SMPClientAgent -> SMPServer -> (SMPSub, C.APrivateSignKey) -> ExceptT SMPClientError IO ()
+subscribeQueue :: SMPClientAgent -> SMPServer -> (SMPSub, C.APrivateAuthKey) -> ExceptT SMPClientError IO ()
 subscribeQueue ca srv sub = do
   atomically $ addPendingSubscription ca srv sub
   withSMP ca srv $ \smp -> subscribe_ smp `catchE` handleErr
@@ -284,20 +286,20 @@ subscribeQueue ca srv sub = do
         removePendingSubscription ca srv (fst sub)
       throwE e
 
-subscribeQueuesSMP :: SMPClientAgent -> SMPServer -> NonEmpty (RecipientId, RcvPrivateSignKey) -> IO (NonEmpty (RecipientId, Either SMPClientError ()))
+subscribeQueuesSMP :: SMPClientAgent -> SMPServer -> NonEmpty (RecipientId, RcvPrivateAuthKey) -> IO (NonEmpty (RecipientId, Either SMPClientError ()))
 subscribeQueuesSMP = subscribeQueues_ SPRecipient
 
-subscribeQueuesNtfs :: SMPClientAgent -> SMPServer -> NonEmpty (NotifierId, NtfPrivateSignKey) -> IO (NonEmpty (NotifierId, Either SMPClientError ()))
+subscribeQueuesNtfs :: SMPClientAgent -> SMPServer -> NonEmpty (NotifierId, NtfPrivateAuthKey) -> IO (NonEmpty (NotifierId, Either SMPClientError ()))
 subscribeQueuesNtfs = subscribeQueues_ SPNotifier
 
-subscribeQueues_ :: SMPSubParty -> SMPClientAgent -> SMPServer -> NonEmpty (QueueId, C.APrivateSignKey) -> IO (NonEmpty (QueueId, Either SMPClientError ()))
+subscribeQueues_ :: SMPSubParty -> SMPClientAgent -> SMPServer -> NonEmpty (QueueId, C.APrivateAuthKey) -> IO (NonEmpty (QueueId, Either SMPClientError ()))
 subscribeQueues_ party ca srv subs = do
   atomically $ forM_ subs $ addPendingSubscription ca srv . first (party,)
   runExceptT (getSMPServerClient' ca srv) >>= \case
     Left e -> pure $ L.map ((,Left e) . fst) subs
     Right smp -> smpSubscribeQueues party ca smp srv subs
 
-smpSubscribeQueues :: SMPSubParty -> SMPClientAgent -> SMPClient -> SMPServer -> NonEmpty (QueueId, C.APrivateSignKey) -> IO (NonEmpty (QueueId, Either SMPClientError ()))
+smpSubscribeQueues :: SMPSubParty -> SMPClientAgent -> SMPClient -> SMPServer -> NonEmpty (QueueId, C.APrivateAuthKey) -> IO (NonEmpty (QueueId, Either SMPClientError ()))
 smpSubscribeQueues party ca smp srv subs = do
   rs <- L.zip subs <$> subscribe smp (L.map swap subs)
   atomically $ forM rs $ \(sub, r) ->
@@ -318,22 +320,22 @@ showServer :: SMPServer -> ByteString
 showServer ProtocolServer {host, port} =
   strEncode host <> B.pack (if null port then "" else ':' : port)
 
-smpSubscribe :: SMPClient -> (SMPSub, C.APrivateSignKey) -> ExceptT SMPClientError IO ()
+smpSubscribe :: SMPClient -> (SMPSub, C.APrivateAuthKey) -> ExceptT SMPClientError IO ()
 smpSubscribe smp ((party, queueId), privKey) = subscribe_ smp privKey queueId
   where
     subscribe_ = case party of
       SPRecipient -> subscribeSMPQueue
       SPNotifier -> subscribeSMPQueueNotifications
 
-addSubscription :: SMPClientAgent -> SMPServer -> (SMPSub, C.APrivateSignKey) -> STM ()
+addSubscription :: SMPClientAgent -> SMPServer -> (SMPSub, C.APrivateAuthKey) -> STM ()
 addSubscription ca srv sub = do
   addSub_ (srvSubs ca) srv sub
   removePendingSubscription ca srv $ fst sub
 
-addPendingSubscription :: SMPClientAgent -> SMPServer -> (SMPSub, C.APrivateSignKey) -> STM ()
+addPendingSubscription :: SMPClientAgent -> SMPServer -> (SMPSub, C.APrivateAuthKey) -> STM ()
 addPendingSubscription = addSub_ . pendingSrvSubs
 
-addSub_ :: TMap SMPServer (TMap SMPSub C.APrivateSignKey) -> SMPServer -> (SMPSub, C.APrivateSignKey) -> STM ()
+addSub_ :: TMap SMPServer (TMap SMPSub C.APrivateAuthKey) -> SMPServer -> (SMPSub, C.APrivateAuthKey) -> STM ()
 addSub_ subs srv (s, key) =
   TM.lookup srv subs >>= \case
     Just m -> TM.insert s key m
@@ -345,11 +347,11 @@ removeSubscription = removeSub_ . srvSubs
 removePendingSubscription :: SMPClientAgent -> SMPServer -> SMPSub -> STM ()
 removePendingSubscription = removeSub_ . pendingSrvSubs
 
-removeSub_ :: TMap SMPServer (TMap SMPSub C.APrivateSignKey) -> SMPServer -> SMPSub -> STM ()
+removeSub_ :: TMap SMPServer (TMap SMPSub C.APrivateAuthKey) -> SMPServer -> SMPSub -> STM ()
 removeSub_ subs srv s = TM.lookup srv subs >>= mapM_ (TM.delete s)
 
-getSubKey :: TMap SMPServer (TMap SMPSub C.APrivateSignKey) -> SMPServer -> SMPSub -> STM (Maybe C.APrivateSignKey)
+getSubKey :: TMap SMPServer (TMap SMPSub C.APrivateAuthKey) -> SMPServer -> SMPSub -> STM (Maybe C.APrivateAuthKey)
 getSubKey subs srv s = TM.lookup srv subs $>>= TM.lookup s
 
-hasSub :: TMap SMPServer (TMap SMPSub C.APrivateSignKey) -> SMPServer -> SMPSub -> STM Bool
+hasSub :: TMap SMPServer (TMap SMPSub C.APrivateAuthKey) -> SMPServer -> SMPSub -> STM Bool
 hasSub subs srv s = maybe (pure False) (TM.member s) =<< TM.lookup srv subs

src/Simplex/Messaging/Compression.hs

@@ -0,0 +1,80 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.Messaging.Compression where
+
+import qualified Codec.Compression.Zstd.FFI as Z
+import Control.Monad (forM)
+import Control.Monad.Except
+import Control.Monad.IO.Class
+import Data.ByteString (ByteString)
+import qualified Data.ByteString as B
+import qualified Data.ByteString.Unsafe as B
+import Data.Either (fromRight)
+import Data.List.NonEmpty (NonEmpty)
+import Foreign
+import Foreign.C.Types
+import GHC.IO (unsafePerformIO)
+import Simplex.Messaging.Encoding
+import UnliftIO.Exception (bracket)
+
+data Compressed
+  = -- | Short messages are left intact to skip copying and FFI festivities.
+    Passthrough ByteString
+  | -- | Generic compression using no extra context.
+    Compressed Large
+
+-- | Messages below this length are not encoded to avoid compression overhead.
+maxLengthPassthrough :: Int
+maxLengthPassthrough = 180 -- Sampled from real client data. Messages with length > 180 rapidly gain compression ratio.
+
+instance Encoding Compressed where
+  smpEncode = \case
+    Passthrough bytes -> "0" <> smpEncode bytes
+    Compressed bytes -> "1" <> smpEncode bytes
+  smpP =
+    smpP >>= \case
+      '0' -> Passthrough <$> smpP
+      '1' -> Compressed <$> smpP
+      x -> fail $ "unknown Compressed tag: " <> show x
+
+type CompressCtx = (Ptr Z.CCtx, Ptr CChar, CSize)
+
+withCompressCtx :: CSize -> (CompressCtx -> IO a) -> IO a
+withCompressCtx scratchSize action =
+  bracket Z.createCCtx Z.freeCCtx $ \cctx ->
+    allocaBytes (fromIntegral scratchSize) $ \scratchPtr ->
+      action (cctx, scratchPtr, scratchSize)
+
+-- | Compress bytes, falling back to Passthrough in case of some internal error.
+compress :: CompressCtx -> ByteString -> IO Compressed
+compress ctx bs = fromRight (Passthrough bs) <$> compress_ ctx bs
+
+compress_ :: CompressCtx -> ByteString -> IO (Either String Compressed)
+compress_ (cctx, scratchPtr, scratchSize) bs
+  | B.length bs <= maxLengthPassthrough = pure . Right $ Passthrough bs
+  | otherwise =
+      B.unsafeUseAsCStringLen bs $ \(sourcePtr, sourceSize) -> runExceptT $ do
+        -- should not fail, unless input buffer is too short
+        dstSize <- ExceptT $ Z.checkError $ Z.compressCCtx cctx scratchPtr scratchSize sourcePtr (fromIntegral sourceSize) 3
+        liftIO $ Compressed . Large <$> B.packCStringLen (scratchPtr, fromIntegral dstSize)
+
+type DecompressCtx = (Ptr Z.DCtx, Ptr CChar, CSize)
+
+withDecompressCtx :: Int -> (DecompressCtx -> IO a) -> IO a
+withDecompressCtx maxUnpackedSize action =
+  bracket Z.createDCtx Z.freeDCtx $ \dctx ->
+    allocaBytes maxUnpackedSize $ \scratchPtr ->
+      action (dctx, scratchPtr, fromIntegral maxUnpackedSize)
+
+decompress :: DecompressCtx -> Compressed -> IO (Either String ByteString)
+decompress (dctx, scratchPtr, scratchSize) = \case
+  Passthrough bs -> pure $ Right bs
+  Compressed (Large bs) ->
+    B.unsafeUseAsCStringLen bs $ \(sourcePtr, sourceSize) -> do
+      res <- Z.checkError $ Z.decompressDCtx dctx scratchPtr scratchSize sourcePtr (fromIntegral sourceSize)
+      forM res $ \dstSize -> B.packCStringLen (scratchPtr, fromIntegral dstSize)
+
+decompressBatch :: Int -> NonEmpty Compressed -> NonEmpty (Either String ByteString)
+decompressBatch maxUnpackedSize items = unsafePerformIO $ withDecompressCtx maxUnpackedSize $ forM items . decompress
+{-# NOINLINE decompressBatch #-} -- prevent double-evaluation under unsafePerformIO

src/Simplex/Messaging/Crypto.hs

@@ -8,6 +8,7 @@
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE RankNTypes #-}
@@ -36,7 +37,7 @@ module Simplex.Messaging.Crypto
     Algorithm (..),
     SAlgorithm (..),
     Alg (..),
-    SignAlg (..),
+    AuthAlg (..),
     DhAlg (..),
     DhAlgorithm,
     PrivateKey (..),
@@ -53,22 +54,32 @@ module Simplex.Messaging.Crypto
     APublicVerifyKey (..),
     APrivateDhKey (..),
     APublicDhKey (..),
+    APrivateAuthKey (..),
+    APublicAuthKey (..),
     CryptoPublicKey (..),
     CryptoPrivateKey (..),
+    AAuthKeyPair,
     KeyPair,
+    KeyPairX25519,
     ASignatureKeyPair,
     DhSecret (..),
     DhSecretX25519,
     ADhSecret (..),
     KeyHash (..),
+    newRandom,
+    newRandomDRG,
+    generateAKeyPair,
     generateKeyPair,
-    generateKeyPair',
     generateSignatureKeyPair,
+    generateAuthKeyPair,
     generateDhKeyPair,
     privateToX509,
+    x509ToPublic,
+    x509ToPrivate,
     publicKey,
     signatureKeyPair,
     publicToX509,
+    encodeASNObj,
 
     -- * key encoding/decoding
     encodePubKey,
@@ -83,12 +94,20 @@ module Simplex.Messaging.Crypto
     CryptoSignature (..),
     SignatureSize (..),
     SignatureAlgorithm,
+    AuthAlgorithm,
     AlgorithmI (..),
     sign,
     sign',
     verify,
     verify',
     validSignatureSize,
+    checkAlgorithm,
+
+    -- * crypto_box authenticator, as discussed in https://groups.google.com/g/sci.crypt/c/73yb5a9pz2Y/m/LNgRO7IYXOwJ
+    CbAuthenticator (..),
+    cbAuthenticatorSize,
+    cbAuthenticate,
+    cbVerify,
 
     -- * DH derivation
     dh',
@@ -105,7 +124,6 @@ module Simplex.Messaging.Crypto
     decryptAESNoPad,
     authTagSize,
     randomAesKey,
-    randomIV,
     randomGCMIV,
     ivSize,
     gcmIVSize,
@@ -115,13 +133,14 @@ module Simplex.Messaging.Crypto
     CbNonce (unCbNonce),
     pattern CbNonce,
     cbEncrypt,
+    cbEncryptNoPad,
     cbEncryptMaxLenBS,
     cbDecrypt,
+    cbDecryptNoPad,
     sbDecrypt_,
     sbEncrypt_,
     cbNonce,
     randomCbNonce,
-    pseudoRandomCbNonce,
 
     -- * NaCl crypto_secretbox
     SbKey (unSbKey),
@@ -133,7 +152,7 @@ module Simplex.Messaging.Crypto
     randomSbKey,
 
     -- * pseudo-random bytes
-    pseudoRandomBytes,
+    randomBytes,
 
     -- * digests
     sha256Hash,
@@ -148,10 +167,13 @@ module Simplex.Messaging.Crypto
     Certificate,
     signCertificate,
     signX509,
+    verifyX509,
     certificateFingerprint,
     signedFingerprint,
     SignatureAlgorithmX509 (..),
     SignedObject (..),
+    encodeCertChain,
+    certChainP,
 
     -- * Cryptography error type
     CryptoError (..),
@@ -174,13 +196,13 @@ import Crypto.Cipher.AES (AES256)
 import qualified Crypto.Cipher.Types as AES
 import qualified Crypto.Cipher.XSalsa as XSalsa
 import qualified Crypto.Error as CE
-import Crypto.Hash (Digest, SHA256 (..), SHA512, hash)
+import Crypto.Hash (Digest, SHA256 (..), SHA512 (..), hash, hashDigestSize)
 import qualified Crypto.MAC.Poly1305 as Poly1305
 import qualified Crypto.PubKey.Curve25519 as X25519
 import qualified Crypto.PubKey.Curve448 as X448
 import qualified Crypto.PubKey.Ed25519 as Ed25519
 import qualified Crypto.PubKey.Ed448 as Ed448
-import Crypto.Random (ChaChaDRG, getRandomBytes, randomBytesGenerate)
+import Crypto.Random (ChaChaDRG, MonadPseudoRandom, drgNew, randomBytesGenerate, withDRG)
 import Data.ASN1.BinaryEncoding
 import Data.ASN1.Encoding
 import Data.ASN1.Types
@@ -196,6 +218,7 @@ import qualified Data.ByteString.Char8 as B
 import Data.ByteString.Lazy (fromStrict, toStrict)
 import Data.Constraint (Dict (..))
 import Data.Kind (Constraint, Type)
+import qualified Data.List.NonEmpty as L
 import Data.String
 import Data.Type.Equality
 import Data.Typeable (Proxy (Proxy), Typeable)
@@ -221,16 +244,14 @@ data SAlgorithm :: Algorithm -> Type where
   SX25519 :: SAlgorithm X25519
   SX448 :: SAlgorithm X448
 
-deriving instance Eq (SAlgorithm a)
-
 deriving instance Show (SAlgorithm a)
 
 data Alg = forall a. AlgorithmI a => Alg (SAlgorithm a)
 
-data SignAlg
+data AuthAlg
   = forall a.
-    (AlgorithmI a, SignatureAlgorithm a) =>
-    SignAlg (SAlgorithm a)
+    (AlgorithmI a, AuthAlgorithm a) =>
+    AuthAlg (SAlgorithm a)
 
 data DhAlg
   = forall a.
@@ -275,10 +296,11 @@ data APublicKey
     AlgorithmI a =>
     APublicKey (SAlgorithm a) (PublicKey a)
 
-instance Eq APublicKey where
-  APublicKey a k == APublicKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
+instance Encoding APublicKey where
+  smpEncode = smpEncode . encodePubKey
+  {-# INLINE smpEncode #-}
+  smpDecode = decodePubKey
+  {-# INLINE smpDecode #-}
 
 deriving instance Show APublicKey
 
@@ -314,11 +336,6 @@ data APrivateKey
     AlgorithmI a =>
     APrivateKey (SAlgorithm a) (PrivateKey a)
 
-instance Eq APrivateKey where
-  APrivateKey a k == APrivateKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 deriving instance Show APrivateKey
 
 type PrivateKeyEd25519 = PrivateKey Ed25519
@@ -344,11 +361,6 @@ data APrivateSignKey
     (AlgorithmI a, SignatureAlgorithm a) =>
     APrivateSignKey (SAlgorithm a) (PrivateKey a)
 
-instance Eq APrivateSignKey where
-  APrivateSignKey a k == APrivateSignKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 deriving instance Show APrivateSignKey
 
 instance Encoding APrivateSignKey where
@@ -368,11 +380,6 @@ data APublicVerifyKey
     (AlgorithmI a, SignatureAlgorithm a) =>
     APublicVerifyKey (SAlgorithm a) (PublicKey a)
 
-instance Eq APublicVerifyKey where
-  APublicVerifyKey a k == APublicVerifyKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 deriving instance Show APublicVerifyKey
 
 data APrivateDhKey
@@ -380,11 +387,6 @@ data APrivateDhKey
     (AlgorithmI a, DhAlgorithm a) =>
     APrivateDhKey (SAlgorithm a) (PrivateKey a)
 
-instance Eq APrivateDhKey where
-  APrivateDhKey a k == APrivateDhKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 deriving instance Show APrivateDhKey
 
 data APublicDhKey
@@ -392,11 +394,6 @@ data APublicDhKey
     (AlgorithmI a, DhAlgorithm a) =>
     APublicDhKey (SAlgorithm a) (PublicKey a)
 
-instance Eq APublicDhKey where
-  APublicDhKey a k == APublicDhKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 deriving instance Show APublicDhKey
 
 data DhSecret (a :: Algorithm) where
@@ -426,6 +423,57 @@ dhAlgorithm = \case
   SX448 -> Just Dict
   _ -> Nothing
 
+data APrivateAuthKey
+  = forall a.
+    (AlgorithmI a, AuthAlgorithm a) =>
+    APrivateAuthKey (SAlgorithm a) (PrivateKey a)
+
+instance Eq APrivateAuthKey where
+  APrivateAuthKey a k == APrivateAuthKey a' k' = case testEquality a a' of
+    Just Refl -> k == k'
+    Nothing -> False
+
+deriving instance Show APrivateAuthKey
+
+instance Encoding APrivateAuthKey where
+  smpEncode = smpEncode . encodePrivKey
+  {-# INLINE smpEncode #-}
+  smpDecode = decodePrivKey
+  {-# INLINE smpDecode #-}
+
+instance StrEncoding APrivateAuthKey where
+  strEncode = strEncode . encodePrivKey
+  {-# INLINE strEncode #-}
+  strDecode = decodePrivKey
+  {-# INLINE strDecode #-}
+
+data APublicAuthKey
+  = forall a.
+    (AlgorithmI a, AuthAlgorithm a) =>
+    APublicAuthKey (SAlgorithm a) (PublicKey a)
+
+instance Eq APublicAuthKey where
+  APublicAuthKey a k == APublicAuthKey a' k' = case testEquality a a' of
+    Just Refl -> k == k'
+    Nothing -> False
+
+deriving instance Show APublicAuthKey
+
+-- either X25519 or Ed algorithm that can be used to authorize commands to SMP server
+type family AuthAlgorithm (a :: Algorithm) :: Constraint where
+  AuthAlgorithm Ed25519 = ()
+  AuthAlgorithm Ed448 = ()
+  AuthAlgorithm X25519 = ()
+  AuthAlgorithm a =
+    (Int ~ Bool, TypeError (Text "Algorithm " :<>: ShowType a :<>: Text " cannot be used for authorization"))
+
+authAlgorithm :: SAlgorithm a -> Maybe (Dict (AuthAlgorithm a))
+authAlgorithm = \case
+  SEd25519 -> Just Dict
+  SEd448 -> Just Dict
+  SX25519 -> Just Dict
+  _ -> Nothing
+
 dhBytes' :: DhSecret a -> ByteString
 dhBytes' = \case
   DhSecretX25519 s -> BA.convert s
@@ -465,6 +513,12 @@ instance CryptoPublicKey APublicVerifyKey where
     Just Dict -> Right $ APublicVerifyKey a k
     _ -> Left "key does not support signature algorithms"
 
+instance CryptoPublicKey APublicAuthKey where
+  toPubKey f (APublicAuthKey _ k) = f k
+  pubKey (APublicKey a k) = case authAlgorithm a of
+    Just Dict -> Right $ APublicAuthKey a k
+    _ -> Left "key does not support auth algorithms"
+
 instance CryptoPublicKey APublicDhKey where
   toPubKey f (APublicDhKey _ k) = f k
   pubKey (APublicKey a k) = case dhAlgorithm a of
@@ -481,6 +535,12 @@ instance Encoding APublicVerifyKey where
   smpDecode = decodePubKey
   {-# INLINE smpDecode #-}
 
+instance Encoding APublicAuthKey where
+  smpEncode = smpEncode . encodePubKey
+  {-# INLINE smpEncode #-}
+  smpDecode = decodePubKey
+  {-# INLINE smpDecode #-}
+
 instance Encoding APublicDhKey where
   smpEncode = smpEncode . encodePubKey
   {-# INLINE smpEncode #-}
@@ -499,6 +559,12 @@ instance StrEncoding APublicVerifyKey where
   strDecode = decodePubKey
   {-# INLINE strDecode #-}
 
+instance StrEncoding APublicAuthKey where
+  strEncode = strEncode . encodePubKey
+  {-# INLINE strEncode #-}
+  strDecode = decodePubKey
+  {-# INLINE strDecode #-}
+
 instance StrEncoding APublicDhKey where
   strEncode = strEncode . encodePubKey
   {-# INLINE strEncode #-}
@@ -546,6 +612,13 @@ instance CryptoPrivateKey APrivateSignKey where
     Just Dict -> Right $ APrivateSignKey a k
     _ -> Left "key does not support signature algorithms"
 
+instance CryptoPrivateKey APrivateAuthKey where
+  type PublicKeyType APrivateAuthKey = APublicAuthKey
+  toPrivKey f (APrivateAuthKey _ k) = f k
+  privKey (APrivateKey a k) = case authAlgorithm a of
+    Just Dict -> Right $ APrivateAuthKey a k
+    _ -> Left "key does not support auth algorithms"
+
 instance CryptoPrivateKey APrivateDhKey where
   type PublicKeyType APrivateDhKey = APublicDhKey
   toPrivKey f (APrivateDhKey _ k) = f k
@@ -589,23 +662,40 @@ type KeyPairType pk = (PublicKeyType pk, pk)
 
 type KeyPair a = KeyPairType (PrivateKey a)
 
+type KeyPairX25519 = KeyPair X25519
+
+-- TODO narrow key pair types to have the same algorithm in both keys
 type AKeyPair = KeyPairType APrivateKey
 
 type ASignatureKeyPair = KeyPairType APrivateSignKey
 
 type ADhKeyPair = KeyPairType APrivateDhKey
 
-generateKeyPair :: AlgorithmI a => SAlgorithm a -> IO AKeyPair
-generateKeyPair a = bimap (APublicKey a) (APrivateKey a) <$> generateKeyPair'
+type AAuthKeyPair = KeyPairType APrivateAuthKey
 
-generateSignatureKeyPair :: (AlgorithmI a, SignatureAlgorithm a) => SAlgorithm a -> IO ASignatureKeyPair
-generateSignatureKeyPair a = bimap (APublicVerifyKey a) (APrivateSignKey a) <$> generateKeyPair'
+newRandom :: IO (TVar ChaChaDRG)
+newRandom = newTVarIO =<< drgNew
 
-generateDhKeyPair :: (AlgorithmI a, DhAlgorithm a) => SAlgorithm a -> IO ADhKeyPair
-generateDhKeyPair a = bimap (APublicDhKey a) (APrivateDhKey a) <$> generateKeyPair'
+newRandomDRG :: TVar ChaChaDRG -> STM (TVar ChaChaDRG)
+newRandomDRG g = newTVar =<< stateTVar g (`withDRG` drgNew)
 
-generateKeyPair' :: forall a. AlgorithmI a => IO (KeyPair a)
-generateKeyPair' = case sAlgorithm @a of
+generateAKeyPair :: AlgorithmI a => SAlgorithm a -> TVar ChaChaDRG -> STM AKeyPair
+generateAKeyPair a g = bimap (APublicKey a) (APrivateKey a) <$> generateKeyPair g
+
+generateSignatureKeyPair :: (AlgorithmI a, SignatureAlgorithm a) => SAlgorithm a -> TVar ChaChaDRG -> STM ASignatureKeyPair
+generateSignatureKeyPair a g = bimap (APublicVerifyKey a) (APrivateSignKey a) <$> generateKeyPair g
+
+generateAuthKeyPair :: (AlgorithmI a, AuthAlgorithm a) => SAlgorithm a -> TVar ChaChaDRG -> STM AAuthKeyPair
+generateAuthKeyPair a g = bimap (APublicAuthKey a) (APrivateAuthKey a) <$> generateKeyPair g
+
+generateDhKeyPair :: (AlgorithmI a, DhAlgorithm a) => SAlgorithm a -> TVar ChaChaDRG -> STM ADhKeyPair
+generateDhKeyPair a g = bimap (APublicDhKey a) (APrivateDhKey a) <$> generateKeyPair g
+
+generateKeyPair :: forall a. AlgorithmI a => TVar ChaChaDRG -> STM (KeyPair a)
+generateKeyPair g = stateTVar g (`withDRG` generateKeyPair_)
+
+generateKeyPair_ :: forall a. AlgorithmI a => MonadPseudoRandom ChaChaDRG (KeyPair a)
+generateKeyPair_ = case sAlgorithm @a of
   SEd25519 ->
     Ed25519.generateSecretKey >>= \pk ->
       let k = Ed25519.toPublic pk
@@ -627,6 +717,10 @@ instance ToField APrivateSignKey where toField = toField . encodePrivKey
 
 instance ToField APublicVerifyKey where toField = toField . encodePubKey
 
+instance ToField APrivateAuthKey where toField = toField . encodePrivKey
+
+instance ToField APublicAuthKey where toField = toField . encodePubKey
+
 instance ToField APrivateDhKey where toField = toField . encodePrivKey
 
 instance ToField APublicDhKey where toField = toField . encodePubKey
@@ -641,6 +735,10 @@ instance FromField APrivateSignKey where fromField = blobFieldDecoder decodePriv
 
 instance FromField APublicVerifyKey where fromField = blobFieldDecoder decodePubKey
 
+instance FromField APrivateAuthKey where fromField = blobFieldDecoder decodePrivKey
+
+instance FromField APublicAuthKey where fromField = blobFieldDecoder decodePubKey
+
 instance FromField APrivateDhKey where fromField = blobFieldDecoder decodePrivKey
 
 instance FromField APublicDhKey where fromField = blobFieldDecoder decodePubKey
@@ -651,15 +749,13 @@ instance (Typeable a, AlgorithmI a) => FromField (PublicKey a) where fromField =
 
 instance (Typeable a, AlgorithmI a) => FromField (DhSecret a) where fromField = blobFieldDecoder strDecode
 
-instance IsString (Maybe ASignature) where
+instance IsString ASignature where
   fromString = parseString $ decode >=> decodeSignature
 
 data Signature (a :: Algorithm) where
   SignatureEd25519 :: Ed25519.Signature -> Signature Ed25519
   SignatureEd448 :: Ed448.Signature -> Signature Ed448
 
-deriving instance Eq (Signature a)
-
 deriving instance Show (Signature a)
 
 data ASignature
@@ -667,11 +763,6 @@ data ASignature
     (AlgorithmI a, SignatureAlgorithm a) =>
     ASignature (SAlgorithm a) (Signature a)
 
-instance Eq ASignature where
-  ASignature a s == ASignature a' s' = case testEquality a a' of
-    Just Refl -> s == s'
-    _ -> False
-
 deriving instance Show ASignature
 
 class CryptoSignature s where
@@ -756,6 +847,8 @@ data CryptoError
     CryptoHeaderError String
   | -- | no sending chain key in ratchet state
     CERatchetState
+  | -- | no decapsulation key in ratchet state
+    CERatchetKEMState
   | -- | header decryption error (could indicate that another key should be tried)
     CERatchetHeader
   | -- | too many skipped messages
@@ -974,15 +1067,11 @@ initAEADGCM (Key aesKey) (GCMIV ivBytes) = cryptoFailable $ do
   AES.aeadInit AES.AEAD_GCM cipher ivBytes
 
 -- | Random AES256 key.
-randomAesKey :: IO Key
-randomAesKey = Key <$> getRandomBytes aesKeySize
+randomAesKey :: TVar ChaChaDRG -> STM Key
+randomAesKey = fmap Key . randomBytes aesKeySize
 
--- | Random IV bytes for AES256 encryption.
-randomIV :: IO IV
-randomIV = IV <$> getRandomBytes (ivSize @AES256)
-
-randomGCMIV :: IO GCMIV
-randomGCMIV = GCMIV <$> getRandomBytes gcmIVSize
+randomGCMIV :: TVar ChaChaDRG -> STM GCMIV
+randomGCMIV = fmap GCMIV . randomBytes gcmIVSize
 
 ivSize :: forall c. AES.BlockCipher c => Int
 ivSize = AES.blockSize (undefined :: c)
@@ -1020,6 +1109,18 @@ signX509 key = fst . objectToSignedExact f
         signatureAlgorithmX509 key,
         ()
       )
+{-# INLINE signX509 #-}
+
+verifyX509 :: (ASN1Object o, Eq o, Show o) => APublicVerifyKey -> SignedExact o -> Either String o
+verifyX509 key exact = do
+  signature <- case signedAlg of
+    SignatureALG_IntrinsicHash PubKeyALG_Ed25519 -> ASignature SEd25519 <$> decodeSignature signedSignature
+    SignatureALG_IntrinsicHash PubKeyALG_Ed448 -> ASignature SEd448 <$> decodeSignature signedSignature
+    _ -> Left "unknown x509 signature algorithm"
+  if verify key signature $ getSignedData exact then Right signedObject else Left "bad signature"
+  where
+    Signed {signedObject, signedAlg, signedSignature} = getSigned exact
+{-# INLINE verifyX509 #-}
 
 certificateFingerprint :: SignedCertificate -> KeyHash
 certificateFingerprint = signedFingerprint
@@ -1048,7 +1149,7 @@ instance SignatureAlgorithmX509 pk => SignatureAlgorithmX509 (a, pk) where
   signatureAlgorithmX509 = signatureAlgorithmX509 . snd
 
 -- | A wrapper to marshall signed ASN1 objects, like certificates.
-newtype SignedObject a = SignedObject (SignedExact a)
+newtype SignedObject a = SignedObject {getSignedExact :: SignedExact a}
 
 instance (Typeable a, Eq a, Show a, ASN1Object a) => FromField (SignedObject a) where
   fromField = fmap SignedObject . blobFieldDecoder decodeSignedObject
@@ -1056,6 +1157,20 @@ instance (Typeable a, Eq a, Show a, ASN1Object a) => FromField (SignedObject a)
 instance (Eq a, Show a, ASN1Object a) => ToField (SignedObject a) where
   toField (SignedObject s) = toField $ encodeSignedObject s
 
+instance (Eq a, Show a, ASN1Object a) => Encoding (SignedObject a) where
+  smpEncode (SignedObject exact) = smpEncode . Large $ encodeSignedObject exact
+  smpP = fmap SignedObject . decodeSignedObject . unLarge <$?> smpP
+
+encodeCertChain :: CertificateChain -> L.NonEmpty Large
+encodeCertChain cc = L.fromList $ map Large blobs
+  where
+    CertificateChainRaw blobs = encodeCertificateChain cc
+
+certChainP :: A.Parser CertificateChain
+certChainP = do
+  rawChain <- CertificateChainRaw . map unLarge . L.toList <$> smpP
+  either (fail . show) pure $ decodeCertificateChain rawChain
+
 -- | Signature verification.
 --
 -- Used by SMP servers to authorize SMP commands and by SMP agents to verify messages.
@@ -1072,10 +1187,14 @@ dh' :: DhAlgorithm a => PublicKey a -> PrivateKey a -> DhSecret a
 dh' (PublicKeyX25519 k) (PrivateKeyX25519 pk _) = DhSecretX25519 $ X25519.dh k pk
 dh' (PublicKeyX448 k) (PrivateKeyX448 pk _) = DhSecretX448 $ X448.dh k pk
 
--- | NaCl @crypto_box@ encrypt with a shared DH secret and 192-bit nonce.
+-- | NaCl @crypto_box@ encrypt with padding with a shared DH secret and 192-bit nonce.
 cbEncrypt :: DhSecret X25519 -> CbNonce -> ByteString -> Int -> Either CryptoError ByteString
 cbEncrypt (DhSecretX25519 secret) = sbEncrypt_ secret
 
+-- | NaCl @crypto_box@ encrypt with a shared DH secret and 192-bit nonce (without padding).
+cbEncryptNoPad :: DhSecret X25519 -> CbNonce -> ByteString -> ByteString
+cbEncryptNoPad (DhSecretX25519 secret) (CbNonce nonce) = cryptoBox secret nonce
+
 -- | NaCl @secret_box@ encrypt with a symmetric 256-bit key and 192-bit nonce.
 sbEncrypt :: SbKey -> CbNonce -> ByteString -> Int -> Either CryptoError ByteString
 sbEncrypt (SbKey key) = sbEncrypt_ key
@@ -1097,21 +1216,43 @@ cryptoBox secret nonce s = BA.convert tag <> c
 cbDecrypt :: DhSecret X25519 -> CbNonce -> ByteString -> Either CryptoError ByteString
 cbDecrypt (DhSecretX25519 secret) = sbDecrypt_ secret
 
+-- | NaCl @crypto_box@ decrypt with a shared DH secret and 192-bit nonce (without unpadding).
+cbDecryptNoPad :: DhSecret X25519 -> CbNonce -> ByteString -> Either CryptoError ByteString
+cbDecryptNoPad (DhSecretX25519 secret) = sbDecryptNoPad_ secret
+
 -- | NaCl @secret_box@ decrypt with a symmetric 256-bit key and 192-bit nonce.
 sbDecrypt :: SbKey -> CbNonce -> ByteString -> Either CryptoError ByteString
 sbDecrypt (SbKey key) = sbDecrypt_ key
 
 -- | NaCl @crypto_box@ decrypt with a shared DH secret and 192-bit nonce.
 sbDecrypt_ :: ByteArrayAccess key => key -> CbNonce -> ByteString -> Either CryptoError ByteString
-sbDecrypt_ secret (CbNonce nonce) packet
+sbDecrypt_ secret nonce = unPad <=< sbDecryptNoPad_ secret nonce
+
+-- | NaCl @crypto_box@ decrypt with a shared DH secret and 192-bit nonce (without unpadding).
+sbDecryptNoPad_ :: ByteArrayAccess key => key -> CbNonce -> ByteString -> Either CryptoError ByteString
+sbDecryptNoPad_ secret (CbNonce nonce) packet
   | B.length packet < 16 = Left CBDecryptError
-  | BA.constEq tag' tag = unPad msg
+  | BA.constEq tag' tag = Right msg
   | otherwise = Left CBDecryptError
   where
     (tag', c) = B.splitAt 16 packet
     (rs, msg) = xSalsa20 secret nonce c
     tag = Poly1305.auth rs c
 
+-- type for authentication scheme using NaCl @crypto_box@ over the sha512 digest of the message.
+newtype CbAuthenticator = CbAuthenticator ByteString deriving (Eq, Show)
+
+cbAuthenticatorSize :: Int
+cbAuthenticatorSize = hashDigestSize SHA512 + authTagSize -- 64 + 16 = 80 bytes
+
+-- create crypto_box authenticator for a message.
+cbAuthenticate :: PublicKeyX25519 -> PrivateKeyX25519 -> CbNonce -> ByteString -> CbAuthenticator
+cbAuthenticate k pk nonce msg = CbAuthenticator $ cbEncryptNoPad (dh' k pk) nonce (sha512Hash msg)
+
+-- verify crypto_box authenticator for a message.
+cbVerify :: PublicKeyX25519 -> PrivateKeyX25519 -> CbNonce -> CbAuthenticator -> ByteString -> Bool
+cbVerify k pk nonce (CbAuthenticator s) authorized = cbDecryptNoPad (dh' k pk) nonce s == Right (sha512Hash authorized)
+
 newtype CbNonce = CryptoBoxNonce {unCbNonce :: ByteString}
   deriving (Eq, Show)
 
@@ -1143,14 +1284,11 @@ cbNonce s
   where
     len = B.length s
 
-randomCbNonce :: IO CbNonce
-randomCbNonce = CryptoBoxNonce <$> getRandomBytes 24
+randomCbNonce :: TVar ChaChaDRG -> STM CbNonce
+randomCbNonce = fmap CryptoBoxNonce . randomBytes 24
 
-pseudoRandomCbNonce :: TVar ChaChaDRG -> STM CbNonce
-pseudoRandomCbNonce gVar = CryptoBoxNonce <$> pseudoRandomBytes 24 gVar
-
-pseudoRandomBytes :: Int -> TVar ChaChaDRG -> STM ByteString
-pseudoRandomBytes n gVar = stateTVar gVar $ randomBytesGenerate n
+randomBytes :: Int -> TVar ChaChaDRG -> STM ByteString
+randomBytes n gVar = stateTVar gVar $ randomBytesGenerate n
 
 instance Encoding CbNonce where
   smpEncode = unCbNonce
@@ -1187,8 +1325,8 @@ sbKey s
 unsafeSbKey :: ByteString -> SbKey
 unsafeSbKey s = either error id $ sbKey s
 
-randomSbKey :: IO SbKey
-randomSbKey = SecretBoxKey <$> getRandomBytes 32
+randomSbKey :: TVar ChaChaDRG -> STM SbKey
+randomSbKey gVar = SecretBoxKey <$> randomBytes 32 gVar
 
 xSalsa20 :: ByteArrayAccess key => key -> ByteString -> ByteString -> (ByteString, ByteString)
 xSalsa20 secret nonce msg = (rs, msg')

src/Simplex/Messaging/Crypto/File.hs

@@ -23,6 +23,7 @@ where
 import Control.Exception
 import Control.Monad
 import Control.Monad.Except
+import Crypto.Random (ChaChaDRG)
 import qualified Data.Aeson.TH as J
 import qualified Data.ByteArray as BA
 import Data.ByteString.Char8 (ByteString)
@@ -109,8 +110,8 @@ data FTCryptoError
 plain :: FilePath -> CryptoFile
 plain = (`CryptoFile` Nothing)
 
-randomArgs :: IO CryptoFileArgs
-randomArgs = CFArgs <$> C.randomSbKey <*> C.randomCbNonce
+randomArgs :: TVar ChaChaDRG -> STM CryptoFileArgs
+randomArgs g = CFArgs <$> C.randomSbKey g <*> C.randomCbNonce g
 
 getFileContentsSize :: CryptoFile -> IO Integer
 getFileContentsSize (CryptoFile path cfArgs) = do

src/Simplex/Messaging/Crypto/Lazy.hs

@@ -41,7 +41,6 @@ import qualified Crypto.MAC.Poly1305 as Poly1305
 import Data.Bifunctor (first)
 import Data.ByteArray (ByteArrayAccess)
 import qualified Data.ByteArray as BA
-import qualified Data.ByteString as S
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy.Char8 as LB
@@ -175,7 +174,7 @@ secretBoxTailTag sbProcess secret nonce msg = run <$> sbInit_ secret nonce
 
 -- passes lazy bytestring via initialized secret box returning the reversed list of chunks
 secretBoxLazy_ :: (SbState -> ByteString -> (ByteString, SbState)) -> SbState -> LazyByteString -> ([ByteString], SbState)
-secretBoxLazy_ sbProcess state = foldlChunks update ([], state)
+secretBoxLazy_ sbProcess state = LB.foldlChunks update ([], state)
   where
     update (cs, st) chunk = let (!c, !st') = sbProcess st chunk in (c : cs, st')
 
@@ -231,10 +230,3 @@ cryptoPassed :: CE.CryptoFailable b -> Either CryptoError b
 cryptoPassed = \case
   CE.CryptoPassed a -> Right a
   CE.CryptoFailed e -> Left $ CryptoPoly1305Error e
-
-foldlChunks :: (a -> S.ByteString -> a) -> a -> LazyByteString -> a
-foldlChunks f = go
-  where
-    go !a LB.Empty = a
-    go !a (LB.Chunk c cs) = go (f a c) cs
-{-# INLINE foldlChunks #-}

src/Simplex/Messaging/Crypto/SNTRUP761/Bindings.hs

@@ -19,16 +19,20 @@ import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 
 newtype KEMPublicKey = KEMPublicKey ByteString
-  deriving (Show)
+  deriving (Eq, Show)
 
 newtype KEMSecretKey = KEMSecretKey ScrubbedBytes
-  deriving (Show)
+  deriving (Eq, Show)
 
 newtype KEMCiphertext = KEMCiphertext ByteString
-  deriving (Show)
+  deriving (Eq, Show)
 
 newtype KEMSharedKey = KEMSharedKey ScrubbedBytes
-  deriving (Show)
+  deriving (Eq, Show)
+
+unsafeRevealKEMSharedKey :: KEMSharedKey -> String
+unsafeRevealKEMSharedKey (KEMSharedKey scrubbed) = show (BA.convert scrubbed :: ByteString)
+{-# DEPRECATED unsafeRevealKEMSharedKey "unsafeRevealKEMSharedKey left in code" #-}
 
 type KEMKeyPair = (KEMPublicKey, KEMSecretKey)
 
@@ -60,6 +64,18 @@ sntrup761Dec (KEMCiphertext c) (KEMSecretKey sk) =
       KEMSharedKey
         <$> BA.alloc c_SNTRUP761_SIZE (\kPtr -> c_sntrup761_dec kPtr cPtr skPtr)
 
+instance Encoding KEMSecretKey where
+  smpEncode (KEMSecretKey c) = smpEncode . Large $ BA.convert c
+  smpP = KEMSecretKey . BA.convert . unLarge <$> smpP
+
+instance StrEncoding KEMSecretKey where
+  strEncode (KEMSecretKey pk) = strEncode (BA.convert pk :: ByteString)
+  strP = KEMSecretKey . BA.convert <$> strP @ByteString
+
+instance Encoding KEMPublicKey where
+  smpEncode (KEMPublicKey pk) = smpEncode . Large $ BA.convert pk
+  smpP = KEMPublicKey . BA.convert . unLarge <$> smpP
+
 instance StrEncoding KEMPublicKey where
   strEncode (KEMPublicKey pk) = strEncode (BA.convert pk :: ByteString)
   strP = KEMPublicKey . BA.convert <$> strP @ByteString
@@ -68,6 +84,25 @@ instance Encoding KEMCiphertext where
   smpEncode (KEMCiphertext c) = smpEncode . Large $ BA.convert c
   smpP = KEMCiphertext . BA.convert . unLarge <$> smpP
 
+instance Encoding KEMSharedKey where
+  smpEncode (KEMSharedKey c) = smpEncode (BA.convert c :: ByteString)
+  smpP = KEMSharedKey . BA.convert <$> smpP @ByteString
+
+instance StrEncoding KEMCiphertext where
+  strEncode (KEMCiphertext pk) = strEncode (BA.convert pk :: ByteString)
+  strP = KEMCiphertext . BA.convert <$> strP @ByteString
+
+instance StrEncoding KEMSharedKey where
+  strEncode (KEMSharedKey pk) = strEncode (BA.convert pk :: ByteString)
+  strP = KEMSharedKey . BA.convert <$> strP @ByteString
+
+instance ToJSON KEMSecretKey where
+  toJSON = strToJSON
+  toEncoding = strToJEncoding
+
+instance FromJSON KEMSecretKey where
+  parseJSON = strParseJSON "KEMSecretKey"
+
 instance ToJSON KEMPublicKey where
   toJSON = strToJSON
   toEncoding = strToJEncoding
@@ -75,8 +110,22 @@ instance ToJSON KEMPublicKey where
 instance FromJSON KEMPublicKey where
   parseJSON = strParseJSON "KEMPublicKey"
 
+instance ToJSON KEMCiphertext where
+  toJSON = strToJSON
+  toEncoding = strToJEncoding
+
+instance FromJSON KEMCiphertext where
+  parseJSON = strParseJSON "KEMCiphertext"
+
 instance ToField KEMSharedKey where
   toField (KEMSharedKey k) = toField (BA.convert k :: ByteString)
 
 instance FromField KEMSharedKey where
   fromField f = KEMSharedKey . BA.convert @ByteString <$> fromField f
+
+instance ToJSON KEMSharedKey where
+  toJSON = strToJSON
+  toEncoding = strToJEncoding
+
+instance FromJSON KEMSharedKey where
+  parseJSON = strParseJSON "KEMSharedKey"

src/Simplex/Messaging/Crypto/SNTRUP761/Bindings/RNG.hs

@@ -18,7 +18,7 @@ withDRG drg = bracket (createRNGFunc drg) freeHaskellFunPtr
 createRNGFunc :: TVar ChaChaDRG -> IO (FunPtr RNGFunc)
 createRNGFunc drg =
   mkRNGFunc $ \_ctx sz buf -> do
-    bs <- atomically $ C.pseudoRandomBytes (fromIntegral sz) drg
+    bs <- atomically $ C.randomBytes (fromIntegral sz) drg
     copyByteArrayToPtr bs buf
 
 type RNGContext = ()

src/Simplex/Messaging/Encoding.hs

@@ -110,7 +110,7 @@ lenP = fromIntegral . c2w <$> A.anyChar
 {-# INLINE lenP #-}
 
 instance Encoding a => Encoding (Maybe a) where
-  smpEncode = maybe "0" (("1" <>) . smpEncode)
+  smpEncode = maybe "0" (('1' `B.cons`) . smpEncode)
   {-# INLINE smpEncode #-}
   smpP =
     smpP >>= \case
@@ -174,37 +174,37 @@ instance (Encoding a, Encoding b) => Encoding (a, b) where
   {-# INLINE smpP #-}
 
 instance (Encoding a, Encoding b, Encoding c) => Encoding (a, b, c) where
-  smpEncode (a, b, c) = smpEncode a <> smpEncode b <> smpEncode c
+  smpEncode (a, b, c) = B.concat [smpEncode a, smpEncode b, smpEncode c]
   {-# INLINE smpEncode #-}
   smpP = (,,) <$> smpP <*> smpP <*> smpP
   {-# INLINE smpP #-}
 
 instance (Encoding a, Encoding b, Encoding c, Encoding d) => Encoding (a, b, c, d) where
-  smpEncode (a, b, c, d) = smpEncode a <> smpEncode b <> smpEncode c <> smpEncode d
+  smpEncode (a, b, c, d) = B.concat [smpEncode a, smpEncode b, smpEncode c, smpEncode d]
   {-# INLINE smpEncode #-}
   smpP = (,,,) <$> smpP <*> smpP <*> smpP <*> smpP
   {-# INLINE smpP #-}
 
 instance (Encoding a, Encoding b, Encoding c, Encoding d, Encoding e) => Encoding (a, b, c, d, e) where
-  smpEncode (a, b, c, d, e) = smpEncode a <> smpEncode b <> smpEncode c <> smpEncode d <> smpEncode e
+  smpEncode (a, b, c, d, e) = B.concat [smpEncode a, smpEncode b, smpEncode c, smpEncode d, smpEncode e]
   {-# INLINE smpEncode #-}
   smpP = (,,,,) <$> smpP <*> smpP <*> smpP <*> smpP <*> smpP
   {-# INLINE smpP #-}
 
 instance (Encoding a, Encoding b, Encoding c, Encoding d, Encoding e, Encoding f) => Encoding (a, b, c, d, e, f) where
-  smpEncode (a, b, c, d, e, f) = smpEncode a <> smpEncode b <> smpEncode c <> smpEncode d <> smpEncode e <> smpEncode f
+  smpEncode (a, b, c, d, e, f) = B.concat [smpEncode a, smpEncode b, smpEncode c, smpEncode d, smpEncode e, smpEncode f]
   {-# INLINE smpEncode #-}
   smpP = (,,,,,) <$> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP
   {-# INLINE smpP #-}
 
 instance (Encoding a, Encoding b, Encoding c, Encoding d, Encoding e, Encoding f, Encoding g) => Encoding (a, b, c, d, e, f, g) where
-  smpEncode (a, b, c, d, e, f, g) = smpEncode a <> smpEncode b <> smpEncode c <> smpEncode d <> smpEncode e <> smpEncode f <> smpEncode g
+  smpEncode (a, b, c, d, e, f, g) = B.concat [smpEncode a, smpEncode b, smpEncode c, smpEncode d, smpEncode e, smpEncode f, smpEncode g]
   {-# INLINE smpEncode #-}
   smpP = (,,,,,,) <$> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP
   {-# INLINE smpP #-}
 
 instance (Encoding a, Encoding b, Encoding c, Encoding d, Encoding e, Encoding f, Encoding g, Encoding h) => Encoding (a, b, c, d, e, f, g, h) where
-  smpEncode (a, b, c, d, e, f, g, h) = smpEncode a <> smpEncode b <> smpEncode c <> smpEncode d <> smpEncode e <> smpEncode f <> smpEncode g <> smpEncode h
+  smpEncode (a, b, c, d, e, f, g, h) = B.concat [smpEncode a, smpEncode b, smpEncode c, smpEncode d, smpEncode e, smpEncode f, smpEncode g, smpEncode h]
   {-# INLINE smpEncode #-}
   smpP = (,,,,,,,) <$> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP
   {-# INLINE smpP #-}

src/Simplex/Messaging/Encoding/String.hs

@@ -179,6 +179,12 @@ instance (StrEncoding a, StrEncoding b, StrEncoding c, StrEncoding d, StrEncodin
   strP = (,,,,) <$> strP_ <*> strP_ <*> strP_ <*> strP_ <*> strP
   {-# INLINE strP #-}
 
+instance (StrEncoding a, StrEncoding b, StrEncoding c, StrEncoding d, StrEncoding e, StrEncoding f) => StrEncoding (a, b, c, d, e, f) where
+  strEncode (a, b, c, d, e, f) = B.unwords [strEncode a, strEncode b, strEncode c, strEncode d, strEncode e, strEncode f]
+  {-# INLINE strEncode #-}
+  strP = (,,,,,) <$> strP_ <*> strP_ <*> strP_ <*> strP_ <*> strP_ <*> strP
+  {-# INLINE strP #-}
+
 strP_ :: StrEncoding a => Parser a
 strP_ = strP <* A.space
 

src/Simplex/Messaging/Notifications/Client.hs

@@ -10,57 +10,61 @@ import Data.Word (Word16)
 import Simplex.Messaging.Client
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol
+import Simplex.Messaging.Notifications.Transport (NTFVersion, supportedClientNTFVRange)
 import Simplex.Messaging.Protocol (ErrorType)
 import Simplex.Messaging.Util (bshow)
 
-type NtfClient = ProtocolClient ErrorType NtfResponse
+type NtfClient = ProtocolClient NTFVersion ErrorType NtfResponse
 
 type NtfClientError = ProtocolClientError ErrorType
 
-ntfRegisterToken :: NtfClient -> C.APrivateSignKey -> NewNtfEntity 'Token -> ExceptT NtfClientError IO (NtfTokenId, C.PublicKeyX25519)
+defaultNTFClientConfig :: ProtocolClientConfig NTFVersion
+defaultNTFClientConfig = defaultClientConfig supportedClientNTFVRange
+
+ntfRegisterToken :: NtfClient -> C.APrivateAuthKey -> NewNtfEntity 'Token -> ExceptT NtfClientError IO (NtfTokenId, C.PublicKeyX25519)
 ntfRegisterToken c pKey newTkn =
   sendNtfCommand c (Just pKey) "" (TNEW newTkn) >>= \case
     NRTknId tknId dhKey -> pure (tknId, dhKey)
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
-ntfVerifyToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> NtfRegCode -> ExceptT NtfClientError IO ()
+ntfVerifyToken :: NtfClient -> C.APrivateAuthKey -> NtfTokenId -> NtfRegCode -> ExceptT NtfClientError IO ()
 ntfVerifyToken c pKey tknId code = okNtfCommand (TVFY code) c pKey tknId
 
-ntfCheckToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> ExceptT NtfClientError IO NtfTknStatus
+ntfCheckToken :: NtfClient -> C.APrivateAuthKey -> NtfTokenId -> ExceptT NtfClientError IO NtfTknStatus
 ntfCheckToken c pKey tknId =
   sendNtfCommand c (Just pKey) tknId TCHK >>= \case
     NRTkn stat -> pure stat
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
-ntfReplaceToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> DeviceToken -> ExceptT NtfClientError IO ()
+ntfReplaceToken :: NtfClient -> C.APrivateAuthKey -> NtfTokenId -> DeviceToken -> ExceptT NtfClientError IO ()
 ntfReplaceToken c pKey tknId token = okNtfCommand (TRPL token) c pKey tknId
 
-ntfDeleteToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> ExceptT NtfClientError IO ()
+ntfDeleteToken :: NtfClient -> C.APrivateAuthKey -> NtfTokenId -> ExceptT NtfClientError IO ()
 ntfDeleteToken = okNtfCommand TDEL
 
-ntfEnableCron :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> Word16 -> ExceptT NtfClientError IO ()
+ntfEnableCron :: NtfClient -> C.APrivateAuthKey -> NtfTokenId -> Word16 -> ExceptT NtfClientError IO ()
 ntfEnableCron c pKey tknId int = okNtfCommand (TCRN int) c pKey tknId
 
-ntfCreateSubscription :: NtfClient -> C.APrivateSignKey -> NewNtfEntity 'Subscription -> ExceptT NtfClientError IO NtfSubscriptionId
+ntfCreateSubscription :: NtfClient -> C.APrivateAuthKey -> NewNtfEntity 'Subscription -> ExceptT NtfClientError IO NtfSubscriptionId
 ntfCreateSubscription c pKey newSub =
   sendNtfCommand c (Just pKey) "" (SNEW newSub) >>= \case
     NRSubId subId -> pure subId
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
-ntfCheckSubscription :: NtfClient -> C.APrivateSignKey -> NtfSubscriptionId -> ExceptT NtfClientError IO NtfSubStatus
+ntfCheckSubscription :: NtfClient -> C.APrivateAuthKey -> NtfSubscriptionId -> ExceptT NtfClientError IO NtfSubStatus
 ntfCheckSubscription c pKey subId =
   sendNtfCommand c (Just pKey) subId SCHK >>= \case
     NRSub stat -> pure stat
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
-ntfDeleteSubscription :: NtfClient -> C.APrivateSignKey -> NtfSubscriptionId -> ExceptT NtfClientError IO ()
+ntfDeleteSubscription :: NtfClient -> C.APrivateAuthKey -> NtfSubscriptionId -> ExceptT NtfClientError IO ()
 ntfDeleteSubscription = okNtfCommand SDEL
 
 -- | Send notification server command
-sendNtfCommand :: NtfEntityI e => NtfClient -> Maybe C.APrivateSignKey -> NtfEntityId -> NtfCommand e -> ExceptT NtfClientError IO NtfResponse
+sendNtfCommand :: NtfEntityI e => NtfClient -> Maybe C.APrivateAuthKey -> NtfEntityId -> NtfCommand e -> ExceptT NtfClientError IO NtfResponse
 sendNtfCommand c pKey entId cmd = sendProtocolCommand c pKey entId (NtfCmd sNtfEntity cmd)
 
-okNtfCommand :: NtfEntityI e => NtfCommand e -> NtfClient -> C.APrivateSignKey -> NtfEntityId -> ExceptT NtfClientError IO ()
+okNtfCommand :: NtfEntityI e => NtfCommand e -> NtfClient -> C.APrivateAuthKey -> NtfEntityId -> ExceptT NtfClientError IO ()
 okNtfCommand cmd c pKey entId =
   sendNtfCommand c (Just pKey) entId cmd >>= \case
     NROk -> return ()

src/Simplex/Messaging/Notifications/Protocol.hs

@@ -28,7 +28,7 @@ import Simplex.Messaging.Agent.Protocol (updateSMPServerHosts)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Notifications.Transport (ntfClientHandshake)
+import Simplex.Messaging.Notifications.Transport (NTFVersion, ntfClientHandshake)
 import Simplex.Messaging.Parsers (fromTextField_)
 import Simplex.Messaging.Protocol hiding (Command (..), CommandTag (..))
 import Simplex.Messaging.Util (eitherToMaybe, (<$?>))
@@ -124,8 +124,8 @@ instance ToJSON NtfRegCode where
   toEncoding = strToJEncoding
 
 data NewNtfEntity (e :: NtfEntity) where
-  NewNtfTkn :: DeviceToken -> C.APublicVerifyKey -> C.PublicKeyX25519 -> NewNtfEntity 'Token
-  NewNtfSub :: NtfTokenId -> SMPQueueNtf -> NtfPrivateSignKey -> NewNtfEntity 'Subscription
+  NewNtfTkn :: DeviceToken -> NtfPublicAuthKey -> C.PublicKeyX25519 -> NewNtfEntity 'Token
+  NewNtfSub :: NtfTokenId -> SMPQueueNtf -> NtfPrivateAuthKey -> NewNtfEntity 'Subscription
 
 deriving instance Show (NewNtfEntity e)
 
@@ -147,7 +147,7 @@ instance Encoding ANewNtfEntity where
       'S' -> ANE SSubscription <$> (NewNtfSub <$> smpP <*> smpP <*> smpP)
       _ -> fail "bad ANewNtfEntity"
 
-instance Protocol ErrorType NtfResponse where
+instance Protocol NTFVersion ErrorType NtfResponse where
   type ProtoCommand NtfResponse = NtfCmd
   type ProtoType NtfResponse = 'PNTF
   protocolClientHandshake = ntfClientHandshake
@@ -184,7 +184,7 @@ data NtfCmd = forall e. NtfEntityI e => NtfCmd (SNtfEntity e) (NtfCommand e)
 
 deriving instance Show NtfCmd
 
-instance NtfEntityI e => ProtocolEncoding ErrorType (NtfCommand e) where
+instance NtfEntityI e => ProtocolEncoding NTFVersion ErrorType (NtfCommand e) where
   type Tag (NtfCommand e) = NtfCommandTag e
   encodeProtocol _v = \case
     TNEW newTkn -> e (TNEW_, ' ', newTkn)
@@ -203,27 +203,27 @@ instance NtfEntityI e => ProtocolEncoding ErrorType (NtfCommand e) where
 
   protocolP _v tag = (\(NtfCmd _ c) -> checkEntity c) <$?> protocolP _v (NCT (sNtfEntity @e) tag)
 
-  fromProtocolError = fromProtocolError @ErrorType @NtfResponse
+  fromProtocolError = fromProtocolError @NTFVersion @ErrorType @NtfResponse
   {-# INLINE fromProtocolError #-}
 
-  checkCredentials (sig, _, entityId, _) cmd = case cmd of
+  checkCredentials (auth, _, entityId, _) cmd = case cmd of
     -- TNEW and SNEW must have signature but NOT token/subscription IDs
     TNEW {} -> sigNoEntity
     SNEW {} -> sigNoEntity
     PING
-      | isNothing sig && B.null entityId -> Right cmd
+      | isNothing auth && B.null entityId -> Right cmd
       | otherwise -> Left $ CMD HAS_AUTH
     -- other client commands must have both signature and entity ID
     _
-      | isNothing sig || B.null entityId -> Left $ CMD NO_AUTH
+      | isNothing auth || B.null entityId -> Left $ CMD NO_AUTH
       | otherwise -> Right cmd
     where
       sigNoEntity
-        | isNothing sig = Left $ CMD NO_AUTH
+        | isNothing auth = Left $ CMD NO_AUTH
         | not (B.null entityId) = Left $ CMD HAS_AUTH
         | otherwise = Right cmd
 
-instance ProtocolEncoding ErrorType NtfCmd where
+instance ProtocolEncoding NTFVersion ErrorType NtfCmd where
   type Tag NtfCmd = NtfCmdTag
   encodeProtocol _v (NtfCmd _ c) = encodeProtocol _v c
 
@@ -243,7 +243,7 @@ instance ProtocolEncoding ErrorType NtfCmd where
         SDEL_ -> pure SDEL
         PING_ -> pure PING
 
-  fromProtocolError = fromProtocolError @ErrorType @NtfResponse
+  fromProtocolError = fromProtocolError @NTFVersion @ErrorType @NtfResponse
   {-# INLINE fromProtocolError #-}
 
   checkCredentials t (NtfCmd e c) = NtfCmd e <$> checkCredentials t c
@@ -290,7 +290,7 @@ data NtfResponse
   | NRPong
   deriving (Show)
 
-instance ProtocolEncoding ErrorType NtfResponse where
+instance ProtocolEncoding NTFVersion ErrorType NtfResponse where
   type Tag NtfResponse = NtfResponseTag
   encodeProtocol _v = \case
     NRTknId entId dhKey -> e (NRTknId_, ' ', entId, dhKey)
@@ -358,7 +358,11 @@ instance StrEncoding SMPQueueNtf where
     notifierId <- A.char '/' *> strP
     pure SMPQueueNtf {smpServer, notifierId}
 
-data PushProvider = PPApnsDev | PPApnsProd | PPApnsTest
+data PushProvider
+  = PPApnsDev -- provider for Apple development environment
+  | PPApnsProd -- production environment, including TestFlight
+  | PPApnsTest -- used for tests, to use APNS mock server
+  | PPApnsNull -- used to test servers from the client - does not communicate with APNS
   deriving (Eq, Ord, Show)
 
 instance Encoding PushProvider where
@@ -366,11 +370,13 @@ instance Encoding PushProvider where
     PPApnsDev -> "AD"
     PPApnsProd -> "AP"
     PPApnsTest -> "AT"
+    PPApnsNull -> "AN"
   smpP =
     A.take 2 >>= \case
       "AD" -> pure PPApnsDev
       "AP" -> pure PPApnsProd
       "AT" -> pure PPApnsTest
+      "AN" -> pure PPApnsNull
       _ -> fail "bad PushProvider"
 
 instance StrEncoding PushProvider where
@@ -378,11 +384,13 @@ instance StrEncoding PushProvider where
     PPApnsDev -> "apns_dev"
     PPApnsProd -> "apns_prod"
     PPApnsTest -> "apns_test"
+    PPApnsNull -> "apns_null"
   strP =
     A.takeTill (== ' ') >>= \case
       "apns_dev" -> pure PPApnsDev
       "apns_prod" -> pure PPApnsProd
       "apns_test" -> pure PPApnsTest
+      "apns_null" -> pure PPApnsNull
       _ -> fail "bad PushProvider"
 
 instance FromField PushProvider where fromField = fromTextField_ $ eitherToMaybe . strDecode . encodeUtf8

src/Simplex/Messaging/Notifications/Server.hs

@@ -48,8 +48,8 @@ import qualified Simplex.Messaging.Protocol as SMP
 import Simplex.Messaging.Server
 import Simplex.Messaging.Server.Stats
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Transport (ATransport (..), THandle (..), TProxy, Transport (..))
-import Simplex.Messaging.Transport.Server (runTransportServer)
+import Simplex.Messaging.Transport (ATransport (..), THandle (..), THandleAuth (..), THandleParams (..), TProxy, Transport (..))
+import Simplex.Messaging.Transport.Server (runTransportServer, tlsServerCredentials)
 import Simplex.Messaging.Util
 import System.Exit (exitFailure)
 import System.IO (BufferMode (..), hPutStrLn, hSetBuffering)
@@ -82,12 +82,16 @@ ntfServer cfg@NtfServerConfig {transports, transportConfig = tCfg} started = do
     runServer :: (ServiceName, ATransport) -> M ()
     runServer (tcpPort, ATransport t) = do
       serverParams <- asks tlsServerParams
-      runTransportServer started tcpPort serverParams tCfg (runClient t)
+      serverSignKey <- either fail pure . fromTLSCredentials $ tlsServerCredentials serverParams
+      runTransportServer started tcpPort serverParams tCfg (runClient serverSignKey t)
+    fromTLSCredentials (_, pk) = C.x509ToPrivate (pk, []) >>= C.privKey
 
-    runClient :: Transport c => TProxy c -> c -> M ()
-    runClient _ h = do
+    runClient :: Transport c => C.APrivateSignKey -> TProxy c -> c -> M ()
+    runClient signKey _ h = do
       kh <- asks serverIdentity
-      liftIO (runExceptT $ ntfServerHandshake h kh supportedNTFServerVRange) >>= \case
+      ks <- atomically . C.generateKeyPair =<< asks random
+      NtfServerConfig {ntfServerVRange} <- asks config
+      liftIO (runExceptT $ ntfServerHandshake signKey h ks kh ntfServerVRange) >>= \case
         Right th -> runNtfClientTransport th
         Left _ -> pure ()
 
@@ -109,9 +113,9 @@ ntfServer cfg@NtfServerConfig {transports, transportConfig = tCfg} started = do
       liftIO $ threadDelay' $ 1000000 * (initialDelay + if initialDelay < 0 then 86400 else 0)
       NtfServerStats {fromTime, tknCreated, tknVerified, tknDeleted, subCreated, subDeleted, ntfReceived, ntfDelivered, activeTokens, activeSubs} <- asks serverStats
       let interval = 1000000 * logInterval
-      withFile statsFilePath AppendMode $ \h -> liftIO $ do
-        hSetBuffering h LineBuffering
-        forever $ do
+      forever $ do
+        withFile statsFilePath AppendMode $ \h -> liftIO $ do
+          hSetBuffering h LineBuffering
           ts <- getCurrentTime
           fromTime' <- atomically $ swapTVar fromTime ts
           tknCreated' <- atomically $ swapTVar tknCreated 0
@@ -141,7 +145,7 @@ ntfServer cfg@NtfServerConfig {transports, transportConfig = tCfg} started = do
                 weekCount sub,
                 monthCount sub
               ]
-          threadDelay' interval
+        liftIO $ threadDelay' interval
 
 resubscribe :: NtfSubscriber -> Map NtfSubscriptionId NtfSubData -> M ()
 resubscribe NtfSubscriber {newSubQ} subs = do
@@ -334,57 +338,57 @@ updateTknStatus NtfTknData {ntfTknId, tknStatus} status = do
   old <- atomically $ stateTVar tknStatus (,status)
   when (old /= status) $ withNtfLog $ \sl -> logTokenStatus sl ntfTknId status
 
-runNtfClientTransport :: Transport c => THandle c -> M ()
-runNtfClientTransport th@THandle {sessionId} = do
+runNtfClientTransport :: Transport c => THandleNTF c -> M ()
+runNtfClientTransport th@THandle {params} = do
   qSize <- asks $ clientQSize . config
   ts <- liftIO getSystemTime
-  c <- atomically $ newNtfServerClient qSize sessionId ts
+  c <- atomically $ newNtfServerClient qSize params ts
   s <- asks subscriber
   ps <- asks pushServer
   expCfg <- asks $ inactiveClientExpiration . config
   raceAny_ ([liftIO $ send th c, client c s ps, receive th c] <> disconnectThread_ c expCfg)
     `finally` liftIO (clientDisconnected c)
   where
-    disconnectThread_ c (Just expCfg) = [liftIO $ disconnectTransport th c activeAt expCfg]
+    disconnectThread_ c (Just expCfg) = [liftIO $ disconnectTransport th (rcvActiveAt c) (sndActiveAt c) expCfg (pure True)]
     disconnectThread_ _ _ = []
 
 clientDisconnected :: NtfServerClient -> IO ()
 clientDisconnected NtfServerClient {connected} = atomically $ writeTVar connected False
 
-receive :: Transport c => THandle c -> NtfServerClient -> M ()
-receive th NtfServerClient {rcvQ, sndQ, activeAt} = forever $ do
+receive :: Transport c => THandleNTF c -> NtfServerClient -> M ()
+receive th@THandle {params = THandleParams {thAuth}} NtfServerClient {rcvQ, sndQ, rcvActiveAt} = forever $ do
   ts <- liftIO $ tGet th
   forM_ ts $ \t@(_, _, (corrId, entId, cmdOrError)) -> do
-    atomically . writeTVar activeAt =<< liftIO getSystemTime
+    atomically . writeTVar rcvActiveAt =<< liftIO getSystemTime
     logDebug "received transmission"
     case cmdOrError of
       Left e -> write sndQ (corrId, entId, NRErr e)
       Right cmd ->
-        verifyNtfTransmission t cmd >>= \case
+        verifyNtfTransmission ((,C.cbNonce (SMP.bs corrId)) <$> thAuth) t cmd >>= \case
           VRVerified req -> write rcvQ req
           VRFailed -> write sndQ (corrId, entId, NRErr AUTH)
   where
     write q t = atomically $ writeTBQueue q t
 
-send :: Transport c => THandle c -> NtfServerClient -> IO ()
-send h@THandle {thVersion = v} NtfServerClient {sndQ, sessionId, activeAt} = forever $ do
+send :: Transport c => THandleNTF c -> NtfServerClient -> IO ()
+send h@THandle {params} NtfServerClient {sndQ, sndActiveAt} = forever $ do
   t <- atomically $ readTBQueue sndQ
-  void . liftIO $ tPut h Nothing [(Nothing, encodeTransmission v sessionId t)]
-  atomically . writeTVar activeAt =<< liftIO getSystemTime
+  void . liftIO $ tPut h [Right (Nothing, encodeTransmission params t)]
+  atomically . writeTVar sndActiveAt =<< liftIO getSystemTime
 
 -- instance Show a => Show (TVar a) where
 --   show x = unsafePerformIO $ show <$> readTVarIO x
 
 data VerificationResult = VRVerified NtfRequest | VRFailed
 
-verifyNtfTransmission :: SignedTransmission ErrorType NtfCmd -> NtfCmd -> M VerificationResult
-verifyNtfTransmission (sig_, signed, (corrId, entId, _)) cmd = do
+verifyNtfTransmission :: Maybe (THandleAuth, C.CbNonce) -> SignedTransmission ErrorType NtfCmd -> NtfCmd -> M VerificationResult
+verifyNtfTransmission auth_ (tAuth, authorized, (corrId, entId, _)) cmd = do
   st <- asks store
   case cmd of
     NtfCmd SToken c@(TNEW tkn@(NewNtfTkn _ k _)) -> do
       r_ <- atomically $ getNtfTokenRegistration st tkn
       pure $
-        if verifyCmdSignature sig_ signed k
+        if verifyCmdAuthorization auth_ tAuth authorized k
           then case r_ of
             Just t@NtfTknData {tknVerifyKey}
               | k == tknVerifyKey -> verifiedTknCmd t c
@@ -405,7 +409,7 @@ verifyNtfTransmission (sig_, signed, (corrId, entId, _)) cmd = do
             then do
               t_ <- atomically $ getActiveNtfToken st subTknId
               verifyToken' t_ $ verifiedSubCmd s c
-            else pure $ maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
+            else pure $ maybe False (dummyVerifyCmd auth_ authorized) tAuth `seq` VRFailed
     NtfCmd SSubscription PING -> pure $ VRVerified $ NtfReqPing corrId entId
     NtfCmd SSubscription c -> do
       s_ <- atomically $ getNtfSubscription st entId
@@ -413,7 +417,7 @@ verifyNtfTransmission (sig_, signed, (corrId, entId, _)) cmd = do
         Just s@NtfSubData {tokenId = subTknId} -> do
           t_ <- atomically $ getActiveNtfToken st subTknId
           verifyToken' t_ $ verifiedSubCmd s c
-        _ -> pure $ maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
+        _ -> pure $ maybe False (dummyVerifyCmd auth_ authorized) tAuth `seq` VRFailed
   where
     verifiedTknCmd t c = VRVerified (NtfReqCmd SToken (NtfTkn t) (corrId, entId, c))
     verifiedSubCmd s c = VRVerified (NtfReqCmd SSubscription (NtfSub s) (corrId, entId, c))
@@ -421,10 +425,10 @@ verifyNtfTransmission (sig_, signed, (corrId, entId, _)) cmd = do
     verifyToken t_ positiveVerificationResult =
       pure $ case t_ of
         Just t@NtfTknData {tknVerifyKey} ->
-          if verifyCmdSignature sig_ signed tknVerifyKey
+          if verifyCmdAuthorization auth_ tAuth authorized tknVerifyKey
             then positiveVerificationResult t
             else VRFailed
-        _ -> maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
+        _ -> maybe False (dummyVerifyCmd auth_ authorized) tAuth `seq` VRFailed
     verifyToken' :: Maybe NtfTknData -> VerificationResult -> M VerificationResult
     verifyToken' t_ = verifyToken t_ . const
 
@@ -440,7 +444,7 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPu
       NtfReqNew corrId (ANE SToken newTkn@(NewNtfTkn _ _ dhPubKey)) -> do
         logDebug "TNEW - new token"
         st <- asks store
-        ks@(srvDhPubKey, srvDhPrivKey) <- liftIO C.generateKeyPair'
+        ks@(srvDhPubKey, srvDhPrivKey) <- atomically . C.generateKeyPair =<< asks random
         let dhSecret = C.dh' dhPubKey srvDhPrivKey
         tknId <- getId
         regCode <- getRegCode
@@ -565,13 +569,11 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPu
           PING -> pure NRPong
       NtfReqPing corrId entId -> pure (corrId, entId, NRPong)
     getId :: M NtfEntityId
-    getId = getRandomBytes =<< asks (subIdBytes . config)
+    getId = randomBytes =<< asks (subIdBytes . config)
     getRegCode :: M NtfRegCode
-    getRegCode = NtfRegCode <$> (getRandomBytes =<< asks (regCodeBytes . config))
-    getRandomBytes :: Int -> M ByteString
-    getRandomBytes n = do
-      gVar <- asks idsDrg
-      atomically (C.pseudoRandomBytes n gVar)
+    getRegCode = NtfRegCode <$> (randomBytes =<< asks (regCodeBytes . config))
+    randomBytes :: Int -> M ByteString
+    randomBytes n = atomically . C.randomBytes n =<< asks random
     cancelInvervalNotifications :: NtfTokenId -> M ()
     cancelInvervalNotifications tknId =
       atomically (TM.lookupDelete tknId intervalNotifiers)

src/Simplex/Messaging/Notifications/Server/Env.hs

@@ -12,7 +12,6 @@ import Control.Concurrent.Async (Async)
 import Control.Logger.Simple
 import Control.Monad.IO.Unlift
 import Crypto.Random
-import Data.ByteString.Char8 (ByteString)
 import Data.Int (Int64)
 import Data.List.NonEmpty (NonEmpty)
 import Data.Time.Clock (getCurrentTime)
@@ -25,6 +24,7 @@ import Numeric.Natural
 import Simplex.Messaging.Client.Agent
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol
+import Simplex.Messaging.Notifications.Transport (NTFVersion, VersionRangeNTF)
 import Simplex.Messaging.Notifications.Server.Push.APNS
 import Simplex.Messaging.Notifications.Server.Stats
 import Simplex.Messaging.Notifications.Server.Store
@@ -33,7 +33,7 @@ import Simplex.Messaging.Protocol (CorrId, SMPServer, Transmission)
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Transport (ATransport)
+import Simplex.Messaging.Transport (ATransport, THandleParams)
 import Simplex.Messaging.Transport.Server (TransportServerConfig, loadFingerprint, loadTLSServerParams)
 import System.IO (IOMode (..))
 import System.Mem.Weak (Weak)
@@ -60,14 +60,15 @@ data NtfServerConfig = NtfServerConfig
     logStatsStartTime :: Int64,
     serverStatsLogFile :: FilePath,
     serverStatsBackupFile :: Maybe FilePath,
+    ntfServerVRange :: VersionRangeNTF,
     transportConfig :: TransportServerConfig
   }
 
 defaultInactiveClientExpiration :: ExpirationConfig
 defaultInactiveClientExpiration =
   ExpirationConfig
-    { ttl = 7200, -- 2 hours
-      checkInterval = 3600 -- seconds, 1 hour
+    { ttl = 43200, -- seconds, 12 hours
+      checkInterval = 3600 -- seconds, 1 hours
     }
 
 data NtfEnv = NtfEnv
@@ -76,7 +77,7 @@ data NtfEnv = NtfEnv
     pushServer :: NtfPushServer,
     store :: NtfStore,
     storeLog :: Maybe (StoreLog 'WriteMode),
-    idsDrg :: TVar ChaChaDRG,
+    random :: TVar ChaChaDRG,
     tlsServerParams :: T.ServerParams,
     serverIdentity :: C.KeyHash,
     serverStats :: NtfServerStats
@@ -84,17 +85,17 @@ data NtfEnv = NtfEnv
 
 newNtfServerEnv :: (MonadUnliftIO m, MonadRandom m) => NtfServerConfig -> m NtfEnv
 newNtfServerEnv config@NtfServerConfig {subQSize, pushQSize, smpAgentCfg, apnsConfig, storeLogFile, caCertificateFile, certificateFile, privateKeyFile} = do
-  idsDrg <- newTVarIO =<< drgNew
+  random <- liftIO C.newRandom
   store <- atomically newNtfStore
   logInfo "restoring subscriptions..."
   storeLog <- liftIO $ mapM (`readWriteNtfStore` store) storeLogFile
   logInfo "restored subscriptions"
-  subscriber <- atomically $ newNtfSubscriber subQSize smpAgentCfg
+  subscriber <- atomically $ newNtfSubscriber subQSize smpAgentCfg random
   pushServer <- atomically $ newNtfPushServer pushQSize apnsConfig
   tlsServerParams <- liftIO $ loadTLSServerParams caCertificateFile certificateFile privateKeyFile
   Fingerprint fp <- liftIO $ loadFingerprint caCertificateFile
   serverStats <- atomically . newNtfServerStats =<< liftIO getCurrentTime
-  pure NtfEnv {config, subscriber, pushServer, store, storeLog, idsDrg, tlsServerParams, serverIdentity = C.KeyHash fp, serverStats}
+  pure NtfEnv {config, subscriber, pushServer, store, storeLog, random, tlsServerParams, serverIdentity = C.KeyHash fp, serverStats}
 
 data NtfSubscriber = NtfSubscriber
   { smpSubscribers :: TMap SMPServer SMPSubscriber,
@@ -102,11 +103,11 @@ data NtfSubscriber = NtfSubscriber
     smpAgent :: SMPClientAgent
   }
 
-newNtfSubscriber :: Natural -> SMPClientAgentConfig -> STM NtfSubscriber
-newNtfSubscriber qSize smpAgentCfg = do
+newNtfSubscriber :: Natural -> SMPClientAgentConfig -> TVar ChaChaDRG -> STM NtfSubscriber
+newNtfSubscriber qSize smpAgentCfg random = do
   smpSubscribers <- TM.empty
   newSubQ <- newTBQueue qSize
-  smpAgent <- newSMPClientAgent smpAgentCfg
+  smpAgent <- newSMPClientAgent smpAgentCfg random
   pure NtfSubscriber {smpSubscribers, newSubQ, smpAgent}
 
 data SMPSubscriber = SMPSubscriber
@@ -142,7 +143,9 @@ newNtfPushServer qSize apnsConfig = do
 
 newPushClient :: NtfPushServer -> PushProvider -> IO PushProviderClient
 newPushClient NtfPushServer {apnsConfig, pushClients} pp = do
-  c <- apnsPushProviderClient <$> createAPNSPushClient (apnsProviderHost pp) apnsConfig
+  c <- case apnsProviderHost pp of
+    Nothing -> pure $ \_ _ -> pure ()
+    Just host -> apnsPushProviderClient <$> createAPNSPushClient host apnsConfig
   atomically $ TM.insert pp c pushClients
   pure c
 
@@ -158,15 +161,17 @@ data NtfRequest
 data NtfServerClient = NtfServerClient
   { rcvQ :: TBQueue NtfRequest,
     sndQ :: TBQueue (Transmission NtfResponse),
-    sessionId :: ByteString,
+    ntfThParams :: THandleParams NTFVersion,
     connected :: TVar Bool,
-    activeAt :: TVar SystemTime
+    rcvActiveAt :: TVar SystemTime,
+    sndActiveAt :: TVar SystemTime
   }
 
-newNtfServerClient :: Natural -> ByteString -> SystemTime -> STM NtfServerClient
-newNtfServerClient qSize sessionId ts = do
+newNtfServerClient :: Natural -> THandleParams NTFVersion -> SystemTime -> STM NtfServerClient
+newNtfServerClient qSize ntfThParams ts = do
   rcvQ <- newTBQueue qSize
   sndQ <- newTBQueue qSize
   connected <- newTVar True
-  activeAt <- newTVar ts
-  return NtfServerClient {rcvQ, sndQ, sessionId, connected, activeAt}
+  rcvActiveAt <- newTVar ts
+  sndActiveAt <- newTVar ts
+  return NtfServerClient {rcvQ, sndQ, ntfThParams, connected, rcvActiveAt, sndActiveAt}

src/Simplex/Messaging/Notifications/Server/Main.hs

@@ -17,10 +17,13 @@ import Simplex.Messaging.Client (ProtocolClientConfig (..))
 import Simplex.Messaging.Client.Agent (SMPClientAgentConfig (..), defaultSMPClientAgentConfig)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Server (runNtfServer)
-import Simplex.Messaging.Notifications.Server.Env (NtfServerConfig (..))
+import Simplex.Messaging.Notifications.Server.Env (NtfServerConfig (..), defaultInactiveClientExpiration)
 import Simplex.Messaging.Notifications.Server.Push.APNS (defaultAPNSPushClientConfig)
+import Simplex.Messaging.Notifications.Transport (supportedServerNTFVRange)
 import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), pattern NtfServer)
 import Simplex.Messaging.Server.CLI
+import Simplex.Messaging.Server.Expiration
+import Simplex.Messaging.Transport (simplexMQVersion)
 import Simplex.Messaging.Transport.Client (TransportHost (..))
 import Simplex.Messaging.Transport.Server (TransportServerConfig (..), defaultTransportServerConfig)
 import System.Directory (createDirectoryIfMissing, doesFileExist)
@@ -28,9 +31,6 @@ import System.FilePath (combine)
 import System.IO (BufferMode (..), hSetBuffering, stderr, stdout)
 import Text.Read (readMaybe)
 
-ntfServerVersion :: String
-ntfServerVersion = "1.6.4"
-
 defaultSMPBatchDelay :: Int
 defaultSMPBatchDelay = 10000
 
@@ -41,6 +41,10 @@ ntfServerCLI cfgPath logPath =
       doesFileExist iniFile >>= \case
         True -> exitError $ "Error: server is already initialized (" <> iniFile <> " exists).\nRun `" <> executableName <> " start`."
         _ -> initializeServer opts
+    OnlineCert certOpts ->
+      doesFileExist iniFile >>= \case
+        True -> genOnline cfgPath certOpts
+        _ -> exitError $ "Error: server is not initialized (" <> iniFile <> " does not exist).\nRun `" <> executableName <> " init`."
     Start ->
       doesFileExist iniFile >>= \case
         True -> readIniFile iniFile >>= either exitError runServer
@@ -52,7 +56,7 @@ ntfServerCLI cfgPath logPath =
       putStrLn "Deleted configuration and log files"
   where
     iniFile = combine cfgPath "ntf-server.ini"
-    serverVersion = "SMP notifications server v" <> ntfServerVersion
+    serverVersion = "SMP notifications server v" <> simplexMQVersion
     defaultServerPort = "443"
     executableName = "ntf-server"
     storeLogFilePath = combine logPath "ntf-server-store.log"
@@ -86,7 +90,12 @@ ntfServerCLI cfgPath logPath =
             <> "log_tls_errors: off\n\
                \# delay between command batches sent to SMP relays (microseconds), 0 to disable\n"
             <> ("smp_batch_delay: " <> show defaultSMPBatchDelay <> "\n")
-            <> "websockets: off\n"
+            <> "websockets: off\n\n\
+               \[INACTIVE_CLIENTS]\n\
+               \# TTL and interval to check inactive clients\n\
+               \disconnect: off\n"
+            <> ("# ttl: " <> show (ttl defaultInactiveClientExpiration) <> "\n")
+            <> ("# check_interval: " <> show (checkInterval defaultInactiveClientExpiration) <> "\n")
     runServer ini = do
       hSetBuffering stdout LineBuffering
       hSetBuffering stderr LineBuffering
@@ -115,7 +124,12 @@ ntfServerCLI cfgPath logPath =
               smpAgentCfg = defaultSMPClientAgentConfig {smpCfg = (smpCfg defaultSMPClientAgentConfig) {batchDelay}},
               apnsConfig = defaultAPNSPushClientConfig,
               subsBatchSize = 900,
-              inactiveClientExpiration = Nothing,
+              inactiveClientExpiration =
+                settingIsOn "INACTIVE_CLIENTS" "disconnect" ini
+                  $> ExpirationConfig
+                    { ttl = readStrictIni "INACTIVE_CLIENTS" "ttl" ini,
+                      checkInterval = readStrictIni "INACTIVE_CLIENTS" "check_interval" ini
+                    },
               storeLogFile = enableStoreLog $> storeLogFilePath,
               caCertificateFile = c caCrtFile,
               privateKeyFile = c serverKeyFile,
@@ -124,6 +138,7 @@ ntfServerCLI cfgPath logPath =
               logStatsStartTime = 0, -- seconds from 00:00 UTC
               serverStatsLogFile = combine logPath "ntf-server-stats.daily.log",
               serverStatsBackupFile = logStats $> combine logPath "ntf-server-stats.log",
+              ntfServerVRange = supportedServerNTFVRange,
               transportConfig =
                 defaultTransportServerConfig
                   { logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini
@@ -132,6 +147,7 @@ ntfServerCLI cfgPath logPath =
 
 data CliCommand
   = Init InitOptions
+  | OnlineCert CertOptions
   | Start
   | Delete
 
@@ -147,6 +163,7 @@ cliCommandP :: FilePath -> FilePath -> FilePath -> Parser CliCommand
 cliCommandP cfgPath logPath iniFile =
   hsubparser
     ( command "init" (info (Init <$> initP) (progDesc $ "Initialize server - creates " <> cfgPath <> " and " <> logPath <> " directories and configuration files"))
+        <> command "cert" (info (OnlineCert <$> certOptionsP) (progDesc $ "Generate new online TLS server credentials (configuration: " <> iniFile <> ")"))
         <> command "start" (info (pure Start) (progDesc $ "Start server (configuration: " <> iniFile <> ")"))
         <> command "delete" (info (pure Delete) (progDesc "Delete configuration and log files"))
     )

src/Simplex/Messaging/Notifications/Server/Push/APNS.hs

@@ -18,7 +18,7 @@ import Control.Monad.IO.Class
 import Crypto.Hash.Algorithms (SHA256 (..))
 import qualified Crypto.PubKey.ECC.ECDSA as EC
 import qualified Crypto.PubKey.ECC.Types as ECT
-import Crypto.Random (ChaChaDRG, drgNew)
+import Crypto.Random (ChaChaDRG)
 import qualified Crypto.Store.PKCS8 as PK
 import Data.ASN1.BinaryEncoding (DER (..))
 import Data.ASN1.Encoding
@@ -193,11 +193,12 @@ data APNSPushClientConfig = APNSPushClientConfig
     caStoreFile :: FilePath
   }
 
-apnsProviderHost :: PushProvider -> HostName
+apnsProviderHost :: PushProvider -> Maybe HostName
 apnsProviderHost = \case
-  PPApnsTest -> "localhost"
-  PPApnsDev -> "api.sandbox.push.apple.com"
-  PPApnsProd -> "api.push.apple.com"
+  PPApnsNull -> Nothing
+  PPApnsTest -> Just "localhost"
+  PPApnsDev -> Just "api.sandbox.push.apple.com"
+  PPApnsProd -> Just "api.push.apple.com"
 
 defaultAPNSPushClientConfig :: APNSPushClientConfig
 defaultAPNSPushClientConfig =
@@ -232,7 +233,7 @@ createAPNSPushClient apnsHost apnsCfg@APNSPushClientConfig {authKeyFileEnv, auth
   authKeyId <- T.pack <$> getEnv authKeyIdEnv
   let jwtHeader = JWTHeader {alg = authKeyAlg, kid = authKeyId}
   jwtToken <- newTVarIO =<< mkApnsJWTToken appTeamId jwtHeader privateKey
-  nonceDrg <- drgNew >>= newTVarIO
+  nonceDrg <- C.newRandom
   pure APNSPushClient {https2Client, privateKey, jwtHeader, jwtToken, nonceDrg, apnsHost, apnsCfg}
 
 getApnsJWTToken :: APNSPushClient -> IO SignedJWTToken
@@ -337,7 +338,7 @@ $(JQ.deriveFromJSON defaultJSON ''APNSErrorResponse)
 apnsPushProviderClient :: APNSPushClient -> PushProviderClient
 apnsPushProviderClient c@APNSPushClient {nonceDrg, apnsCfg} tkn@NtfTknData {token = DeviceToken _ tknStr} pn = do
   http2 <- liftHTTPS2 $ getApnsHTTP2Client c
-  nonce <- atomically $ C.pseudoRandomCbNonce nonceDrg
+  nonce <- atomically $ C.randomCbNonce nonceDrg
   apnsNtf <- liftEither $ first PPCryptoError $ apnsNotification tkn nonce (paddedNtfLength apnsCfg) pn
   req <- liftIO $ apnsRequest c tknStr apnsNtf
   -- TODO when HTTP2 client is thread-safe, we can use sendRequestDirect

src/Simplex/Messaging/Notifications/Server/Store.hs

@@ -19,7 +19,7 @@ import qualified Data.Set as S
 import Data.Word (Word16)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol
-import Simplex.Messaging.Protocol (NtfPrivateSignKey, SMPServer)
+import Simplex.Messaging.Protocol (NtfPrivateAuthKey, NtfPublicAuthKey, SMPServer)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Util (whenM, ($>>=))
@@ -46,7 +46,7 @@ data NtfTknData = NtfTknData
   { ntfTknId :: NtfTokenId,
     token :: DeviceToken,
     tknStatus :: TVar NtfTknStatus,
-    tknVerifyKey :: C.APublicVerifyKey,
+    tknVerifyKey :: NtfPublicAuthKey,
     tknDhKeys :: C.KeyPair 'C.X25519,
     tknDhSecret :: C.DhSecretX25519,
     tknRegCode :: NtfRegCode,
@@ -62,7 +62,7 @@ mkNtfTknData ntfTknId (NewNtfTkn token tknVerifyKey _) tknDhKeys tknDhSecret tkn
 data NtfSubData = NtfSubData
   { ntfSubId :: NtfSubscriptionId,
     smpQueue :: SMPQueueNtf,
-    notifierKey :: NtfPrivateSignKey,
+    notifierKey :: NtfPrivateAuthKey,
     tokenId :: NtfTokenId,
     subStatus :: TVar NtfSubStatus
   }

src/Simplex/Messaging/Notifications/Server/StoreLog.hs

@@ -32,7 +32,7 @@ import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Notifications.Protocol
 import Simplex.Messaging.Notifications.Server.Store
-import Simplex.Messaging.Protocol (NtfPrivateSignKey)
+import Simplex.Messaging.Protocol (NtfPrivateAuthKey)
 import Simplex.Messaging.Server.StoreLog
 import Simplex.Messaging.Util (whenM)
 import System.Directory (doesFileExist, renameFile)
@@ -52,7 +52,7 @@ data NtfTknRec = NtfTknRec
   { ntfTknId :: NtfTokenId,
     token :: DeviceToken,
     tknStatus :: NtfTknStatus,
-    tknVerifyKey :: C.APublicVerifyKey,
+    tknVerifyKey :: C.APublicAuthKey,
     tknDhKeys :: C.KeyPair 'C.X25519,
     tknDhSecret :: C.DhSecretX25519,
     tknRegCode :: NtfRegCode,
@@ -74,7 +74,7 @@ mkTknRec NtfTknData {ntfTknId, token, tknStatus = status, tknVerifyKey, tknDhKey
 data NtfSubRec = NtfSubRec
   { ntfSubId :: NtfSubscriptionId,
     smpQueue :: SMPQueueNtf,
-    notifierKey :: NtfPrivateSignKey,
+    notifierKey :: NtfPrivateAuthKey,
     tokenId :: NtfTokenId,
     subStatus :: NtfSubStatus
   }

src/Simplex/Messaging/Notifications/Transport.hs

@@ -1,72 +1,155 @@
+{-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 
 module Simplex.Messaging.Notifications.Transport where
 
+import Control.Monad (forM)
 import Control.Monad.Except
+import Data.Attoparsec.ByteString.Char8 (Parser)
+import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
+import Data.Word (Word16)
+import qualified Data.X509 as X
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Version
+import Simplex.Messaging.Version.Internal
+import Simplex.Messaging.Util (liftEitherWith)
 
 ntfBlockSize :: Int
 ntfBlockSize = 512
 
-supportedNTFServerVRange :: VersionRange
-supportedNTFServerVRange = mkVersionRange 1 1
+data NTFVersion
+
+instance VersionScope NTFVersion
+
+type VersionNTF = Version NTFVersion
+
+type VersionRangeNTF = VersionRange NTFVersion
+
+pattern VersionNTF :: Word16 -> VersionNTF
+pattern VersionNTF v = Version v
+
+initialNTFVersion :: VersionNTF
+initialNTFVersion = VersionNTF 1
+
+authBatchCmdsNTFVersion :: VersionNTF
+authBatchCmdsNTFVersion = VersionNTF 2
+
+currentClientNTFVersion :: VersionNTF
+currentClientNTFVersion = VersionNTF 1
+
+currentServerNTFVersion :: VersionNTF
+currentServerNTFVersion = VersionNTF 1
+
+supportedClientNTFVRange :: VersionRangeNTF
+supportedClientNTFVRange = mkVersionRange initialNTFVersion currentClientNTFVersion
+
+supportedServerNTFVRange :: VersionRangeNTF
+supportedServerNTFVRange = mkVersionRange initialNTFVersion currentServerNTFVersion
+
+type THandleNTF c = THandle NTFVersion c
 
 data NtfServerHandshake = NtfServerHandshake
-  { ntfVersionRange :: VersionRange,
-    sessionId :: SessionId
+  { ntfVersionRange :: VersionRangeNTF,
+    sessionId :: SessionId,
+    -- pub key to agree shared secrets for command authorization and entity ID encryption.
+    authPubKey :: Maybe (X.SignedExact X.PubKey)
   }
 
 data NtfClientHandshake = NtfClientHandshake
   { -- | agreed SMP notifications server protocol version
-    ntfVersion :: Version,
+    ntfVersion :: VersionNTF,
     -- | server identity - CA certificate fingerprint
-    keyHash :: C.KeyHash
+    keyHash :: C.KeyHash,
+    -- pub key to agree shared secret for entity ID encryption, shared secret for command authorization is agreed using per-queue keys.
+    authPubKey :: Maybe C.PublicKeyX25519
   }
 
 instance Encoding NtfServerHandshake where
-  smpEncode NtfServerHandshake {ntfVersionRange, sessionId} =
-    smpEncode (ntfVersionRange, sessionId)
+  smpEncode NtfServerHandshake {ntfVersionRange, sessionId, authPubKey} =
+    B.concat
+      [ smpEncode (ntfVersionRange, sessionId),
+        encodeAuthEncryptCmds (maxVersion ntfVersionRange) $ C.SignedObject <$> authPubKey
+      ]
+
   smpP = do
     (ntfVersionRange, sessionId) <- smpP
-    pure NtfServerHandshake {ntfVersionRange, sessionId}
+    -- TODO drop SMP v6: remove special parser and make key non-optional
+    authPubKey <- authEncryptCmdsP (maxVersion ntfVersionRange) $ C.getSignedExact <$> smpP
+    pure NtfServerHandshake {ntfVersionRange, sessionId, authPubKey}
+
+encodeAuthEncryptCmds :: Encoding a => VersionNTF -> Maybe a -> ByteString
+encodeAuthEncryptCmds v k
+  | v >= authBatchCmdsNTFVersion = maybe "" smpEncode k
+  | otherwise = ""
+
+authEncryptCmdsP :: VersionNTF -> Parser a -> Parser (Maybe a)
+authEncryptCmdsP v p = if v >= authBatchCmdsNTFVersion then Just <$> p else pure Nothing
 
 instance Encoding NtfClientHandshake where
-  smpEncode NtfClientHandshake {ntfVersion, keyHash} = smpEncode (ntfVersion, keyHash)
+  smpEncode NtfClientHandshake {ntfVersion, keyHash, authPubKey} =
+    smpEncode (ntfVersion, keyHash) <> encodeNtfAuthPubKey ntfVersion authPubKey
   smpP = do
     (ntfVersion, keyHash) <- smpP
-    pure NtfClientHandshake {ntfVersion, keyHash}
+    -- TODO drop SMP v6: remove special parser and make key non-optional
+    authPubKey <- ntfAuthPubKeyP ntfVersion
+    pure NtfClientHandshake {ntfVersion, keyHash, authPubKey}
+
+ntfAuthPubKeyP :: VersionNTF -> Parser (Maybe C.PublicKeyX25519)
+ntfAuthPubKeyP v = if v >= authBatchCmdsNTFVersion then Just <$> smpP else pure Nothing
+
+encodeNtfAuthPubKey :: VersionNTF -> Maybe C.PublicKeyX25519 -> ByteString
+encodeNtfAuthPubKey v k
+  | v >= authBatchCmdsNTFVersion = maybe "" smpEncode k
+  | otherwise = ""
 
 -- | Notifcations server transport handshake.
-ntfServerHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
-ntfServerHandshake c kh ntfVRange = do
-  let th@THandle {sessionId} = ntfTHandle c
-  sendHandshake th $ NtfServerHandshake {sessionId, ntfVersionRange = ntfVRange}
+ntfServerHandshake :: forall c. Transport c => C.APrivateSignKey -> c -> C.KeyPairX25519 -> C.KeyHash -> VersionRangeNTF -> ExceptT TransportError IO (THandleNTF c)
+ntfServerHandshake serverSignKey c (k, pk) kh ntfVRange = do
+  let th@THandle {params = THandleParams {sessionId}} = ntfTHandle c
+  let sk = C.signX509 serverSignKey $ C.publicToX509 k
+  sendHandshake th $ NtfServerHandshake {sessionId, ntfVersionRange = ntfVRange, authPubKey = Just sk}
   getHandshake th >>= \case
-    NtfClientHandshake {ntfVersion, keyHash}
+    NtfClientHandshake {ntfVersion = v, keyHash, authPubKey = k'}
       | keyHash /= kh ->
           throwError $ TEHandshake IDENTITY
-      | ntfVersion `isCompatible` ntfVRange ->
-          pure (th :: THandle c) {thVersion = ntfVersion}
+      | v `isCompatible` ntfVRange ->
+          pure $ ntfThHandle th v pk k'
       | otherwise -> throwError $ TEHandshake VERSION
 
 -- | Notifcations server client transport handshake.
-ntfClientHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
-ntfClientHandshake c keyHash ntfVRange = do
-  let th@THandle {sessionId} = ntfTHandle c
-  NtfServerHandshake {sessionId = sessId, ntfVersionRange} <- getHandshake th
+ntfClientHandshake :: forall c. Transport c => c -> C.KeyPairX25519 -> C.KeyHash -> VersionRangeNTF -> ExceptT TransportError IO (THandleNTF c)
+ntfClientHandshake c (k, pk) keyHash ntfVRange = do
+  let th@THandle {params = THandleParams {sessionId}} = ntfTHandle c
+  NtfServerHandshake {sessionId = sessId, ntfVersionRange, authPubKey = sk'} <- getHandshake th
   if sessionId /= sessId
     then throwError TEBadSession
     else case ntfVersionRange `compatibleVersion` ntfVRange of
-      Just (Compatible ntfVersion) -> do
-        sendHandshake th $ NtfClientHandshake {ntfVersion, keyHash}
-        pure (th :: THandle c) {thVersion = ntfVersion}
+      Just (Compatible v) -> do
+        sk_ <- forM sk' $ \exact -> liftEitherWith (const $ TEHandshake BAD_AUTH) $ do
+          serverKey <- getServerVerifyKey c
+          pubKey <- C.verifyX509 serverKey exact
+          C.x509ToPublic (pubKey, []) >>= C.pubKey
+        sendHandshake th $ NtfClientHandshake {ntfVersion = v, keyHash, authPubKey = Just k}
+        pure $ ntfThHandle th v pk sk_
       Nothing -> throwError $ TEHandshake VERSION
 
-ntfTHandle :: Transport c => c -> THandle c
-ntfTHandle c = THandle {connection = c, sessionId = tlsUnique c, blockSize = ntfBlockSize, thVersion = 0, batch = False}
+ntfThHandle :: forall c. THandleNTF c -> VersionNTF -> C.PrivateKeyX25519 -> Maybe C.PublicKeyX25519 -> THandleNTF c
+ntfThHandle th@THandle {params} v privKey k_ =
+  -- TODO drop SMP v6: make thAuth non-optional
+  let thAuth = (\k -> THandleAuth {peerPubKey = k, privKey}) <$> k_
+      v3 = v >= authBatchCmdsNTFVersion
+      params' = params {thVersion = v, thAuth, implySessId = v3, batch = v3}
+   in (th :: THandleNTF c) {params = params'}
+
+ntfTHandle :: Transport c => c -> THandleNTF c
+ntfTHandle c = THandle {connection = c, params}
+  where
+    params = THandleParams {sessionId = tlsUnique c, blockSize = ntfBlockSize, thVersion = VersionNTF 0, thAuth = Nothing, implySessId = False, batch = False}

src/Simplex/Messaging/Notifications/Types.hs

@@ -47,10 +47,11 @@ data NtfToken = NtfToken
   { deviceToken :: DeviceToken,
     ntfServer :: NtfServer,
     ntfTokenId :: Maybe NtfTokenId,
+    -- TODO combine keys to key pair as the types should match
     -- | key used by the ntf server to verify transmissions
-    ntfPubKey :: C.APublicVerifyKey,
+    ntfPubKey :: C.APublicAuthKey,
     -- | key used by the ntf client to sign transmissions
-    ntfPrivKey :: C.APrivateSignKey,
+    ntfPrivKey :: C.APrivateAuthKey,
     -- | client's DH keys (to repeat registration if necessary)
     ntfDhKeys :: C.KeyPair 'C.X25519,
     -- | shared DH secret used to encrypt/decrypt notifications e2e
@@ -63,7 +64,7 @@ data NtfToken = NtfToken
   }
   deriving (Show)
 
-newNtfToken :: DeviceToken -> NtfServer -> C.ASignatureKeyPair -> C.KeyPair 'C.X25519 -> NotificationsMode -> NtfToken
+newNtfToken :: DeviceToken -> NtfServer -> C.AAuthKeyPair -> C.KeyPair 'C.X25519 -> NotificationsMode -> NtfToken
 newNtfToken deviceToken ntfServer (ntfPubKey, ntfPrivKey) ntfDhKeys ntfMode =
   NtfToken
     { deviceToken,

src/Simplex/Messaging/Protocol.hs

@@ -1,4 +1,5 @@
 {-# LANGUAGE AllowAmbiguousTypes #-}
+{-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE DuplicateRecordFields #-}
@@ -46,6 +47,10 @@ module Simplex.Messaging.Protocol
     e2eEncMessageLength,
 
     -- * SMP protocol types
+    SMPClientVersion,
+    VersionSMPC,
+    VersionRangeSMPC,
+    pattern VersionSMPC,
     ProtocolEncoding (..),
     Command (..),
     SubscriptionMode (..),
@@ -59,6 +64,7 @@ module Simplex.Messaging.Protocol
     ErrorType (..),
     CommandError (..),
     Transmission,
+    TransmissionAuth (..),
     SignedTransmission,
     SentRawTransmission,
     SignedRawTransmission,
@@ -79,6 +85,7 @@ module Simplex.Messaging.Protocol
     SMPServerWithAuth,
     NtfServer,
     pattern NtfServer,
+    NtfServerWithAuth,
     XFTPServer,
     pattern XFTPServer,
     XFTPServerWithAuth,
@@ -92,14 +99,14 @@ module Simplex.Messaging.Protocol
     RecipientId,
     SenderId,
     NotifierId,
-    RcvPrivateSignKey,
-    RcvPublicVerifyKey,
+    RcvPrivateAuthKey,
+    RcvPublicAuthKey,
     RcvPublicDhKey,
     RcvDhSecret,
-    SndPrivateSignKey,
-    SndPublicVerifyKey,
-    NtfPrivateSignKey,
-    NtfPublicVerifyKey,
+    SndPrivateAuthKey,
+    SndPublicAuthKey,
+    NtfPrivateAuthKey,
+    NtfPublicAuthKey,
     RcvNtfPublicDhKey,
     RcvNtfDhSecret,
     Message (..),
@@ -115,6 +122,7 @@ module Simplex.Messaging.Protocol
     SMPMsgMeta (..),
     NMsgMeta (..),
     MsgFlags (..),
+    initialSMPClientVersion,
     userProtocol,
     rcvMessageMeta,
     noMsgFlags,
@@ -124,6 +132,8 @@ module Simplex.Messaging.Protocol
     -- * Parse and serialize
     ProtocolMsgTag (..),
     messageTagP,
+    TransmissionForAuth (..),
+    encodeTransmissionForAuth,
     encodeTransmission,
     transmissionP,
     _smpP,
@@ -132,6 +142,7 @@ module Simplex.Messaging.Protocol
     legacyEncodeServer,
     legacyServerP,
     legacyStrEncodeServer,
+    srvHostnamesSMPClientVersion,
     sameSrvAddr,
     sameSrvAddr',
     noAuthSrv,
@@ -144,8 +155,10 @@ module Simplex.Messaging.Protocol
     tParse,
     tDecodeParseValidate,
     tEncode,
-    tEncodeBatch,
+    tEncodeBatch1,
     batchTransmissions,
+    batchTransmissions',
+    batchTransmissions_,
 
     -- * exports for tests
     CommandTag (..),
@@ -154,12 +167,14 @@ module Simplex.Messaging.Protocol
 where
 
 import Control.Applicative (optional, (<|>))
-import Control.Concurrent (threadDelay)
+import Control.Monad
 import Control.Monad.Except
 import Data.Aeson (FromJSON (..), ToJSON (..))
 import qualified Data.Aeson.TH as J
 import Data.Attoparsec.ByteString.Char8 (Parser, (<?>))
 import qualified Data.Attoparsec.ByteString.Char8 as A
+import Data.Bifunctor (first)
+import qualified Data.ByteString.Base64 as B64
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Char (isPrint, isSpace)
@@ -172,22 +187,46 @@ import Data.Maybe (isJust, isNothing)
 import Data.String
 import Data.Time.Clock.System (SystemTime (..))
 import Data.Type.Equality
+import Data.Word (Word16)
 import GHC.TypeLits (ErrorMessage (..), TypeError, type (+))
-import Network.Socket (HostName, ServiceName)
+import Network.Socket (ServiceName)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers
+import Simplex.Messaging.ServiceScheme
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Transport.Client (TransportHost, TransportHosts (..))
 import Simplex.Messaging.Util (bshow, eitherToMaybe, (<$?>))
 import Simplex.Messaging.Version
+import Simplex.Messaging.Version.Internal
 
-currentSMPClientVersion :: Version
-currentSMPClientVersion = 2
+-- SMP client protocol version history:
+-- 1 - binary protocol encoding (1/1/2022)
+-- 2 - multiple server hostnames and versioned queue addresses (8/12/2022)
 
-supportedSMPClientVRange :: VersionRange
-supportedSMPClientVRange = mkVersionRange 1 currentSMPClientVersion
+data SMPClientVersion
+
+instance VersionScope SMPClientVersion
+
+type VersionSMPC = Version SMPClientVersion
+
+type VersionRangeSMPC = VersionRange SMPClientVersion
+
+pattern VersionSMPC :: Word16 -> VersionSMPC
+pattern VersionSMPC v = Version v
+
+initialSMPClientVersion :: VersionSMPC
+initialSMPClientVersion = VersionSMPC 1
+
+srvHostnamesSMPClientVersion :: VersionSMPC
+srvHostnamesSMPClientVersion = VersionSMPC 2
+
+currentSMPClientVersion :: VersionSMPC
+currentSMPClientVersion = VersionSMPC 2
+
+supportedSMPClientVRange :: VersionRangeSMPC
+supportedSMPClientVRange = mkVersionRange initialSMPClientVersion currentSMPClientVersion
 
 maxMessageLength :: Int
 maxMessageLength = 16088
@@ -239,14 +278,14 @@ deriving instance Show Cmd
 type Transmission c = (CorrId, EntityId, c)
 
 -- | signed parsed transmission, with original raw bytes and parsing error.
-type SignedTransmission e c = (Maybe C.ASignature, Signed, Transmission (Either e c))
+type SignedTransmission e c = (Maybe TransmissionAuth, Signed, Transmission (Either e c))
 
 type Signed = ByteString
 
 -- | unparsed SMP transmission with signature.
 data RawTransmission = RawTransmission
-  { signature :: ByteString,
-    signed :: ByteString,
+  { authenticator :: ByteString, -- signature or encrypted transmission hash
+    authorized :: ByteString, -- authorized transmission
     sessId :: SessionId,
     corrId :: ByteString,
     entityId :: ByteString,
@@ -254,11 +293,32 @@ data RawTransmission = RawTransmission
   }
   deriving (Show)
 
+data TransmissionAuth
+  = TASignature C.ASignature
+  | TAAuthenticator C.CbAuthenticator
+  deriving (Show)
+
+-- this encoding is backwards compatible with v6 that used Maybe C.ASignature instead of TAuthorization
+tAuthBytes :: Maybe TransmissionAuth -> ByteString
+tAuthBytes = \case
+  Nothing -> ""
+  Just (TASignature s) -> C.signatureBytes s
+  Just (TAAuthenticator (C.CbAuthenticator s)) -> s
+
+decodeTAuthBytes :: ByteString -> Either String (Maybe TransmissionAuth)
+decodeTAuthBytes s
+  | B.null s = Right Nothing
+  | B.length s == C.cbAuthenticatorSize = Right . Just . TAAuthenticator $ C.CbAuthenticator s
+  | otherwise = Just . TASignature <$> C.decodeSignature s
+
+instance IsString (Maybe TransmissionAuth) where
+  fromString = parseString $ B64.decode >=> C.decodeSignature >=> pure . fmap TASignature
+
 -- | unparsed sent SMP transmission with signature, without session ID.
-type SignedRawTransmission = (Maybe C.ASignature, SessionId, ByteString, ByteString)
+type SignedRawTransmission = (Maybe TransmissionAuth, SessionId, ByteString, ByteString)
 
 -- | unparsed sent SMP transmission with signature.
-type SentRawTransmission = (Maybe C.ASignature, ByteString)
+type SentRawTransmission = (Maybe TransmissionAuth, ByteString)
 
 -- | SMP queue ID for the recipient.
 type RecipientId = QueueId
@@ -277,10 +337,14 @@ type EntityId = ByteString
 -- | Parameterized type for SMP protocol commands from all clients.
 data Command (p :: Party) where
   -- SMP recipient commands
-  NEW :: RcvPublicVerifyKey -> RcvPublicDhKey -> Maybe BasicAuth -> SubscriptionMode -> Command Recipient
+  -- RcvPublicAuthKey is the key used for command authorization:
+  -- v6 of SMP servers only support signature algorithm for command authorization.
+  -- v7 of SMP servers additionally support additional layer of authenticated encryption.
+  -- RcvPublicAuthKey is defined as C.APublicKey - it can be either signature or DH public keys.
+  NEW :: RcvPublicAuthKey -> RcvPublicDhKey -> Maybe BasicAuth -> SubscriptionMode -> Command Recipient
   SUB :: Command Recipient
-  KEY :: SndPublicVerifyKey -> Command Recipient
-  NKEY :: NtfPublicVerifyKey -> RcvNtfPublicDhKey -> Command Recipient
+  KEY :: SndPublicAuthKey -> Command Recipient
+  NKEY :: NtfPublicAuthKey -> RcvNtfPublicDhKey -> Command Recipient
   NDEL :: Command Recipient
   GET :: Command Recipient
   -- ACK v1 has to be supported for encoding/decoding
@@ -298,8 +362,6 @@ data Command (p :: Party) where
 
 deriving instance Show (Command p)
 
-deriving instance Eq (Command p)
-
 data SubscriptionMode = SMSubscribe | SMOnlyCreate
   deriving (Eq, Show)
 
@@ -339,8 +401,6 @@ data BrokerMsg where
 
 data RcvMessage = RcvMessage
   { msgId :: MsgId,
-    msgTs :: SystemTime,
-    msgFlags :: MsgFlags,
     msgBody :: EncRcvMsgBody -- e2e encrypted, with extra encryption for recipient
   }
   deriving (Eq, Show)
@@ -368,21 +428,6 @@ messageTs = \case
   Message {msgTs} -> msgTs
   MessageQuota {msgTs} -> msgTs
 
-instance StrEncoding RcvMessage where
-  strEncode RcvMessage {msgId, msgTs, msgFlags, msgBody = EncRcvMsgBody body} =
-    B.unwords
-      [ strEncode msgId,
-        strEncode msgTs,
-        "flags=" <> strEncode msgFlags,
-        strEncode body
-      ]
-  strP = do
-    msgId <- strP_
-    msgTs <- strP_
-    msgFlags <- ("flags=" *> strP_) <|> pure noMsgFlags
-    msgBody <- EncRcvMsgBody <$> strP
-    pure RcvMessage {msgId, msgTs, msgFlags, msgBody}
-
 newtype EncRcvMsgBody = EncRcvMsgBody ByteString
   deriving (Eq, Show)
 
@@ -621,7 +666,7 @@ data ClientMsgEnvelope = ClientMsgEnvelope
   deriving (Show)
 
 data PubHeader = PubHeader
-  { phVersion :: Version,
+  { phVersion :: VersionSMPC,
     phE2ePubDhKey :: Maybe C.PublicKeyX25519
   }
   deriving (Show)
@@ -640,7 +685,7 @@ instance Encoding ClientMsgEnvelope where
 data ClientMessage = ClientMessage PrivHeader ByteString
 
 data PrivHeader
-  = PHConfirmation C.APublicVerifyKey
+  = PHConfirmation C.APublicAuthKey
   | PHEmpty
   deriving (Show)
 
@@ -674,6 +719,8 @@ pattern NtfServer host port keyHash = ProtocolServer SPNTF host port keyHash
 
 {-# COMPLETE NtfServer #-}
 
+type NtfServerWithAuth = ProtoServerWithAuth 'PNTF
+
 type XFTPServer = ProtocolServer 'PXFTP
 
 pattern XFTPServer :: NonEmpty TransportHost -> ServiceName -> C.KeyHash -> ProtocolServer 'PXFTP
@@ -719,11 +766,11 @@ deriving instance Show (SProtocolType p)
 
 data AProtocolType = forall p. ProtocolTypeI p => AProtocolType (SProtocolType p)
 
-deriving instance Show AProtocolType
-
 instance Eq AProtocolType where
   AProtocolType p == AProtocolType p' = isJust $ testEquality p p'
 
+deriving instance Show AProtocolType
+
 instance TestEquality SProtocolType where
   testEquality SPSMP SPSMP = Just Refl
   testEquality SPNTF SPNTF = Just Refl
@@ -915,16 +962,6 @@ serverStrP = do
   where
     portP = show <$> (A.char ':' *> (A.decimal :: Parser Int))
 
-data SrvLoc = SrvLoc HostName ServiceName
-  deriving (Eq, Ord, Show)
-
-instance StrEncoding SrvLoc where
-  strEncode (SrvLoc host port) = B.pack $ host <> if null port then "" else ':' : port
-  strP = SrvLoc <$> host <*> (port <|> pure "")
-    where
-      host = B.unpack <$> A.takeWhile1 (A.notInClass ":#,;/ ")
-      port = show <$> (A.char ':' *> (A.decimal :: Parser Int))
-
 -- | Transmission correlation ID.
 newtype CorrId = CorrId {bs :: ByteString} deriving (Eq, Ord, Show)
 
@@ -951,13 +988,13 @@ data QueueIdsKeys = QIK
   }
   deriving (Eq, Show)
 
--- | Recipient's private key used by the recipient to authorize (sign) SMP commands.
+-- | Recipient's private key used by the recipient to authorize (v6: sign, v7: encrypt hash) SMP commands.
 --
 -- Only used by SMP agent, kept here so its definition is close to respective public key.
-type RcvPrivateSignKey = C.APrivateSignKey
+type RcvPrivateAuthKey = C.APrivateAuthKey
 
 -- | Recipient's public key used by SMP server to verify authorization of SMP commands.
-type RcvPublicVerifyKey = C.APublicVerifyKey
+type RcvPublicAuthKey = C.APublicAuthKey
 
 -- | Public key used for DH exchange to encrypt message bodies from server to recipient
 type RcvPublicDhKey = C.PublicKeyX25519
@@ -965,19 +1002,19 @@ type RcvPublicDhKey = C.PublicKeyX25519
 -- | DH Secret used to encrypt message bodies from server to recipient
 type RcvDhSecret = C.DhSecretX25519
 
--- | Sender's private key used by the recipient to authorize (sign) SMP commands.
+-- | Sender's private key used by the recipient to authorize (v6: sign, v7: encrypt hash) SMP commands.
 --
 -- Only used by SMP agent, kept here so its definition is close to respective public key.
-type SndPrivateSignKey = C.APrivateSignKey
+type SndPrivateAuthKey = C.APrivateAuthKey
 
 -- | Sender's public key used by SMP server to verify authorization of SMP commands.
-type SndPublicVerifyKey = C.APublicVerifyKey
+type SndPublicAuthKey = C.APublicAuthKey
 
--- | Private key used by push notifications server to authorize (sign) NSUB command.
-type NtfPrivateSignKey = C.APrivateSignKey
+-- | Private key used by push notifications server to authorize (sign or encrypt hash) NSUB command.
+type NtfPrivateAuthKey = C.APrivateAuthKey
 
 -- | Public key used by SMP server to verify authorization of NSUB command sent by push notifications server.
-type NtfPublicVerifyKey = C.APublicVerifyKey
+type NtfPublicAuthKey = C.APublicAuthKey
 
 -- | Public key used for DH exchange to encrypt notification metadata from server to recipient
 type RcvNtfPublicDhKey = C.PublicKeyX25519
@@ -1038,29 +1075,30 @@ data CommandError
   deriving (Eq, Read, Show)
 
 -- | SMP transmission parser.
-transmissionP :: Parser RawTransmission
-transmissionP = do
-  signature <- smpP
-  signed <- A.takeByteString
-  either fail pure $ parseAll (trn signature signed) signed
+transmissionP :: THandleParams v -> Parser RawTransmission
+transmissionP THandleParams {sessionId, implySessId} = do
+  authenticator <- smpP
+  authorized <- A.takeByteString
+  either fail pure $ parseAll (trn authenticator authorized) authorized
   where
-    trn signature signed = do
-      sessId <- smpP
+    trn authenticator authorized = do
+      sessId <- if implySessId then pure "" else smpP
+      let authorized' = if implySessId then smpEncode sessionId <> authorized else authorized
       corrId <- smpP
       entityId <- smpP
       command <- A.takeByteString
-      pure RawTransmission {signature, signed, sessId, corrId, entityId, command}
+      pure RawTransmission {authenticator, authorized = authorized', sessId, corrId, entityId, command}
 
-class (ProtocolEncoding err msg, ProtocolEncoding err (ProtoCommand msg), Show err, Show msg) => Protocol err msg | msg -> err where
+class (ProtocolEncoding v err msg, ProtocolEncoding v err (ProtoCommand msg), Show err, Show msg) => Protocol v err msg | msg -> v, msg -> err  where
   type ProtoCommand msg = cmd | cmd -> msg
   type ProtoType msg = (sch :: ProtocolType) | sch -> msg
-  protocolClientHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
+  protocolClientHandshake :: forall c. Transport c => c -> C.KeyPairX25519 -> C.KeyHash -> VersionRange v -> ExceptT TransportError IO (THandle v c)
   protocolPing :: ProtoCommand msg
   protocolError :: msg -> Maybe err
 
 type ProtoServer msg = ProtocolServer (ProtoType msg)
 
-instance Protocol ErrorType BrokerMsg where
+instance Protocol SMPVersion ErrorType BrokerMsg where
   type ProtoCommand BrokerMsg = Cmd
   type ProtoType BrokerMsg = 'PSMP
   protocolClientHandshake = smpClientHandshake
@@ -1069,19 +1107,19 @@ instance Protocol ErrorType BrokerMsg where
     ERR e -> Just e
     _ -> Nothing
 
-class ProtocolMsgTag (Tag msg) => ProtocolEncoding err msg | msg -> err where
+class ProtocolMsgTag (Tag msg) => ProtocolEncoding v err msg | msg -> err, msg -> v where
   type Tag msg
-  encodeProtocol :: Version -> msg -> ByteString
-  protocolP :: Version -> Tag msg -> Parser msg
+  encodeProtocol :: Version v -> msg -> ByteString
+  protocolP :: Version v -> Tag msg -> Parser msg
   fromProtocolError :: ProtocolErrorType -> err
   checkCredentials :: SignedRawTransmission -> msg -> Either err msg
 
-instance PartyI p => ProtocolEncoding ErrorType (Command p) where
+instance PartyI p => ProtocolEncoding SMPVersion ErrorType (Command p) where
   type Tag (Command p) = CommandTag p
   encodeProtocol v = \case
     NEW rKey dhKey auth_ subMode
-      | v >= 6 -> new <> auth <> e subMode
-      | v == 5 -> new <> auth
+      | v >= subModeSMPVersion -> new <> auth <> e subMode
+      | v == basicAuthSMPVersion -> new <> auth
       | otherwise -> new
       where
         new = e (NEW_, ' ', rKey, dhKey)
@@ -1091,14 +1129,10 @@ instance PartyI p => ProtocolEncoding ErrorType (Command p) where
     NKEY k dhKey -> e (NKEY_, ' ', k, dhKey)
     NDEL -> e NDEL_
     GET -> e GET_
-    ACK msgId
-      | v == 1 -> e ACK_
-      | otherwise -> e (ACK_, ' ', msgId)
+    ACK msgId -> e (ACK_, ' ', msgId)
     OFF -> e OFF_
     DEL -> e DEL_
-    SEND flags msg
-      | v == 1 -> e (SEND_, ' ', Tail msg)
-      | otherwise -> e (SEND_, ' ', flags, ' ', Tail msg)
+    SEND flags msg -> e (SEND_, ' ', flags, ' ', Tail msg)
     PING -> e PING_
     NSUB -> e NSUB_
     where
@@ -1107,13 +1141,13 @@ instance PartyI p => ProtocolEncoding ErrorType (Command p) where
 
   protocolP v tag = (\(Cmd _ c) -> checkParty c) <$?> protocolP v (CT (sParty @p) tag)
 
-  fromProtocolError = fromProtocolError @ErrorType @BrokerMsg
+  fromProtocolError = fromProtocolError @SMPVersion @ErrorType @BrokerMsg
   {-# INLINE fromProtocolError #-}
 
-  checkCredentials (sig, _, queueId, _) cmd = case cmd of
+  checkCredentials (auth, _, queueId, _) cmd = case cmd of
     -- NEW must have signature but NOT queue ID
     NEW {}
-      | isNothing sig -> Left $ CMD NO_AUTH
+      | isNothing auth -> Left $ CMD NO_AUTH
       | not (B.null queueId) -> Left $ CMD HAS_AUTH
       | otherwise -> Right cmd
     -- SEND must have queue ID, signature is not always required
@@ -1122,14 +1156,14 @@ instance PartyI p => ProtocolEncoding ErrorType (Command p) where
       | otherwise -> Right cmd
     -- PING must not have queue ID or signature
     PING
-      | isNothing sig && B.null queueId -> Right cmd
+      | isNothing auth && B.null queueId -> Right cmd
       | otherwise -> Left $ CMD HAS_AUTH
     -- other client commands must have both signature and queue ID
     _
-      | isNothing sig || B.null queueId -> Left $ CMD NO_AUTH
+      | isNothing auth || B.null queueId -> Left $ CMD NO_AUTH
       | otherwise -> Right cmd
 
-instance ProtocolEncoding ErrorType Cmd where
+instance ProtocolEncoding SMPVersion ErrorType Cmd where
   type Tag Cmd = CmdTag
   encodeProtocol v (Cmd _ c) = encodeProtocol v c
 
@@ -1137,8 +1171,8 @@ instance ProtocolEncoding ErrorType Cmd where
     CT SRecipient tag ->
       Cmd SRecipient <$> case tag of
         NEW_
-          | v >= 6 -> new <*> auth <*> smpP
-          | v == 5 -> new <*> auth <*> pure SMSubscribe
+          | v >= subModeSMPVersion -> new <*> auth <*> smpP
+          | v == basicAuthSMPVersion -> new <*> auth <*> pure SMSubscribe
           | otherwise -> new <*> pure Nothing <*> pure SMSubscribe
           where
             new = NEW <$> _smpP <*> smpP
@@ -1148,32 +1182,26 @@ instance ProtocolEncoding ErrorType Cmd where
         NKEY_ -> NKEY <$> _smpP <*> smpP
         NDEL_ -> pure NDEL
         GET_ -> pure GET
-        ACK_
-          | v == 1 -> pure $ ACK ""
-          | otherwise -> ACK <$> _smpP
+        ACK_ -> ACK <$> _smpP
         OFF_ -> pure OFF
         DEL_ -> pure DEL
     CT SSender tag ->
       Cmd SSender <$> case tag of
-        SEND_
-          | v == 1 -> SEND noMsgFlags <$> (unTail <$> _smpP)
-          | otherwise -> SEND <$> _smpP <*> (unTail <$> _smpP)
+        SEND_ -> SEND <$> _smpP <*> (unTail <$> _smpP)
         PING_ -> pure PING
     CT SNotifier NSUB_ -> pure $ Cmd SNotifier NSUB
 
-  fromProtocolError = fromProtocolError @ErrorType @BrokerMsg
+  fromProtocolError = fromProtocolError @SMPVersion @ErrorType @BrokerMsg
   {-# INLINE fromProtocolError #-}
 
   checkCredentials t (Cmd p c) = Cmd p <$> checkCredentials t c
 
-instance ProtocolEncoding ErrorType BrokerMsg where
+instance ProtocolEncoding SMPVersion ErrorType BrokerMsg where
   type Tag BrokerMsg = BrokerMsgTag
-  encodeProtocol v = \case
+  encodeProtocol _v = \case
     IDS (QIK rcvId sndId srvDh) -> e (IDS_, ' ', rcvId, sndId, srvDh)
-    MSG RcvMessage {msgId, msgTs, msgFlags, msgBody = EncRcvMsgBody body}
-      | v == 1 -> e (MSG_, ' ', msgId, msgTs, Tail body)
-      | v == 2 -> e (MSG_, ' ', msgId, msgTs, msgFlags, ' ', Tail body)
-      | otherwise -> e (MSG_, ' ', msgId, Tail body)
+    MSG RcvMessage {msgId, msgBody = EncRcvMsgBody body} ->
+      e (MSG_, ' ', msgId, Tail body)
     NID nId srvNtfDh -> e (NID_, ' ', nId, srvNtfDh)
     NMSG nmsgNonce encNMsgMeta -> e (NMSG_, ' ', nmsgNonce, encNMsgMeta)
     END -> e END_
@@ -1184,13 +1212,10 @@ instance ProtocolEncoding ErrorType BrokerMsg where
       e :: Encoding a => a -> ByteString
       e = smpEncode
 
-  protocolP v = \case
+  protocolP _v = \case
     MSG_ -> do
       msgId <- _smpP
-      MSG <$> case v of
-        1 -> RcvMessage msgId <$> smpP <*> pure noMsgFlags <*> bodyP
-        2 -> RcvMessage msgId <$> smpP <*> smpP <*> (A.space *> bodyP)
-        _ -> RcvMessage msgId (MkSystemTime 0 0) noMsgFlags <$> bodyP
+      MSG . RcvMessage msgId <$> bodyP
       where
         bodyP = EncRcvMsgBody . unTail <$> smpP
     IDS_ -> IDS <$> (QIK <$> _smpP <*> smpP <*> smpP)
@@ -1223,12 +1248,12 @@ instance ProtocolEncoding ErrorType BrokerMsg where
       | otherwise -> Right cmd
 
 -- | Parse SMP protocol commands and broker messages
-parseProtocol :: forall err msg. ProtocolEncoding err msg => Version -> ByteString -> Either err msg
+parseProtocol :: forall v err msg. ProtocolEncoding v err msg => Version v -> ByteString -> Either err msg
 parseProtocol v s =
   let (tag, params) = B.break (== ' ') s
    in case decodeTag tag of
-        Just cmd -> parse (protocolP v cmd) (fromProtocolError @err @msg $ PECmdSyntax) params
-        Nothing -> Left $ fromProtocolError @err @msg $ PECmdUnknown
+        Just cmd -> parse (protocolP v cmd) (fromProtocolError @v @err @msg $ PECmdSyntax) params
+        Nothing -> Left $ fromProtocolError @v @err @msg $ PECmdUnknown
 
 checkParty :: forall t p p'. (PartyI p, PartyI p') => t p' -> Either String (t p)
 checkParty c = case testEquality (sParty @p) (sParty @p') of
@@ -1283,16 +1308,16 @@ instance Encoding CommandError where
       _ -> fail "bad command error type"
 
 -- | Send signed SMP transmission to TCP transport.
-tPut :: Transport c => THandle c -> Maybe Int -> NonEmpty SentRawTransmission -> IO [Either TransportError ()]
-tPut th delay_ = fmap concat . mapM tPutBatch . batchTransmissions (batch th) (blockSize th)
+tPut :: Transport c => THandle v c -> NonEmpty (Either TransportError SentRawTransmission) -> IO [Either TransportError ()]
+tPut th@THandle {params} = fmap concat . mapM tPutBatch . batchTransmissions (batch params) (blockSize params)
   where
-    tPutBatch :: TransportBatch -> IO [Either TransportError ()]
+    tPutBatch :: TransportBatch () -> IO [Either TransportError ()]
     tPutBatch = \case
-      TBLargeTransmission -> [Left TELargeMsg] <$ putStrLn "tPut error: large message"
-      TBTransmissions n s -> replicate n <$> (tPutLog th (tEncodeBatch n s) <* mapM_ threadDelay delay_)
-      TBTransmission s -> (: []) <$> tPutLog th s
+      TBError e _ -> [Left e] <$ putStrLn "tPut error: large message"
+      TBTransmissions s n _ -> replicate n <$> tPutLog th s
+      TBTransmission s _ -> (: []) <$> tPutLog th s
 
-tPutLog :: Transport c => THandle c -> ByteString -> IO (Either TransportError ())
+tPutLog :: Transport c => THandle v c -> ByteString -> IO (Either TransportError ())
 tPutLog th s = do
   r <- tPutBlock th s
   case r of
@@ -1300,85 +1325,119 @@ tPutLog th s = do
     _ -> pure ()
   pure r
 
--- ByteString does not include length byte, it is added by tEncodeBatch
-data TransportBatch = TBTransmissions Int ByteString | TBTransmission ByteString | TBLargeTransmission
+-- ByteString in TBTransmissions includes byte with transmissions count
+data TransportBatch r = TBTransmissions ByteString Int [r] | TBTransmission ByteString r | TBError TransportError r
 
--- | encodes and batches transmissions into blocks,
-batchTransmissions :: Bool -> Int -> NonEmpty SentRawTransmission -> [TransportBatch]
-batchTransmissions batch bSize
-  | batch = reverse . mkBatch [] . L.map tEncode
-  | otherwise = map (mkBatch1 . tEncode) . L.toList
+batchTransmissions :: Bool -> Int -> NonEmpty (Either TransportError SentRawTransmission) -> [TransportBatch ()]
+batchTransmissions batch bSize = batchTransmissions' batch bSize . L.map (,())
+
+-- | encodes and batches transmissions into blocks
+batchTransmissions' :: forall r. Bool -> Int -> NonEmpty (Either TransportError SentRawTransmission, r) -> [TransportBatch r]
+batchTransmissions' batch bSize ts
+  | batch = batchTransmissions_ bSize $ L.map (first $ fmap tEncodeForBatch) ts
+  | otherwise = map mkBatch1 $ L.toList ts
   where
-    mkBatch :: [TransportBatch] -> NonEmpty ByteString -> [TransportBatch]
-    mkBatch rs ts =
-      let (n, s, ts_) = encodeBatch 0 "" ts
-          r = if n == 0 then TBLargeTransmission else TBTransmissions n s
-          rs' = r : rs
-       in case ts_ of
-            Just ts' -> mkBatch rs' ts'
-            _ -> rs'
-    mkBatch1 :: ByteString -> TransportBatch
-    mkBatch1 s = if B.length s > bSize - 2 then TBLargeTransmission else TBTransmission s
-    encodeBatch :: Int -> ByteString -> NonEmpty ByteString -> (Int, ByteString, Maybe (NonEmpty ByteString))
-    encodeBatch n s ts@(t :| ts_)
-      | n == 255 = (n, s, Just ts)
-      | otherwise =
-          let s' = s <> smpEncode (Large t)
-              n' = n + 1
-           in if B.length s' > bSize - 3 -- one byte is reserved for the number of messages in the batch
-                then (n,s,) $ if n == 0 then L.nonEmpty ts_ else Just ts
-                else case L.nonEmpty ts_ of
-                  Just ts' -> encodeBatch n' s' ts'
-                  _ -> (n', s', Nothing)
+    mkBatch1 :: (Either TransportError SentRawTransmission, r) -> TransportBatch r
+    mkBatch1 (t_, r) = case t_ of
+      Left e -> TBError e r
+      Right t
+        -- 2 bytes are reserved for pad size
+        | B.length s <= bSize - 2 -> TBTransmission s r
+        | otherwise -> TBError TELargeMsg r
+        where
+          s = tEncode t
+
+-- | Pack encoded transmissions into batches
+batchTransmissions_ :: Int -> NonEmpty (Either TransportError ByteString, r) -> [TransportBatch r]
+batchTransmissions_ bSize = addBatch . foldr addTransmission ([], 0, 0, [], [])
+  where
+    -- 3 = 2 bytes reserved for pad size + 1 for transmission count
+    bSize' = bSize - 3
+    addTransmission :: (Either TransportError ByteString, r) -> ([TransportBatch r], Int, Int, [ByteString], [r]) -> ([TransportBatch r], Int, Int, [ByteString], [r])
+    addTransmission (t_, r) acc@(bs, !len, !n, ss, rs) = case t_ of
+      Left e -> (TBError e r : addBatch acc, 0, 0, [], [])
+      Right s
+        | len' <= bSize' && n < 255 -> (bs, len', 1 + n, s : ss, r : rs)
+        | sLen <= bSize' -> (addBatch acc, sLen, 1, [s], [r])
+        | otherwise -> (TBError TELargeMsg r : addBatch acc, 0, 0, [], [])
+        where
+          sLen = B.length s
+          len' = len + sLen
+    addBatch :: ([TransportBatch r], Int, Int, [ByteString], [r]) -> [TransportBatch r]
+    addBatch (bs, _len, n, ss, rs) = if n == 0 then bs else TBTransmissions b n rs : bs
+      where
+        b = B.concat $ B.singleton (lenEncode n) : ss
 
 tEncode :: SentRawTransmission -> ByteString
-tEncode (sig, t) = smpEncode (C.signatureBytes sig) <> t
+tEncode (auth, t) = smpEncode (tAuthBytes auth) <> t
 {-# INLINE tEncode #-}
 
-tEncodeBatch :: Int -> ByteString -> ByteString
-tEncodeBatch n s = lenEncode n `B.cons` s
-{-# INLINE tEncodeBatch #-}
+tEncodeForBatch :: SentRawTransmission -> ByteString
+tEncodeForBatch = smpEncode . Large . tEncode
+{-# INLINE tEncodeForBatch #-}
 
-encodeTransmission :: ProtocolEncoding e c => Version -> ByteString -> Transmission c -> ByteString
-encodeTransmission v sessionId (CorrId corrId, queueId, command) =
-  smpEncode (sessionId, corrId, queueId) <> encodeProtocol v command
+tEncodeBatch1 :: SentRawTransmission -> ByteString
+tEncodeBatch1 t = lenEncode 1 `B.cons` tEncodeForBatch t
+{-# INLINE tEncodeBatch1 #-}
+
+-- tForAuth is lazy to avoid computing it when there is no key to sign
+data TransmissionForAuth = TransmissionForAuth {tForAuth :: ~ByteString, tToSend :: ByteString}
+
+encodeTransmissionForAuth :: ProtocolEncoding v e c => THandleParams v -> Transmission c -> TransmissionForAuth
+encodeTransmissionForAuth THandleParams {thVersion = v, sessionId, implySessId} t =
+  TransmissionForAuth {tForAuth, tToSend = if implySessId then t' else tForAuth}
+  where
+    tForAuth = smpEncode sessionId <> t'
+    t' = encodeTransmission_ v t
+{-# INLINE encodeTransmissionForAuth #-}
+
+encodeTransmission :: ProtocolEncoding v e c => THandleParams v -> Transmission c -> ByteString
+encodeTransmission THandleParams {thVersion = v, sessionId, implySessId} t =
+  if implySessId then t' else smpEncode sessionId <> t'
+  where
+    t' = encodeTransmission_ v t
 {-# INLINE encodeTransmission #-}
 
+encodeTransmission_ :: ProtocolEncoding v e c => Version v -> Transmission c -> ByteString
+encodeTransmission_ v (CorrId corrId, queueId, command) =
+  smpEncode (corrId, queueId) <> encodeProtocol v command
+{-# INLINE encodeTransmission_ #-}
+
 -- | Receive and parse transmission from the TCP transport (ignoring any trailing padding).
-tGetParse :: Transport c => THandle c -> IO (NonEmpty (Either TransportError RawTransmission))
-tGetParse th = eitherList (tParse $ batch th) <$> tGetBlock th
+tGetParse :: Transport c => THandle v c -> IO (NonEmpty (Either TransportError RawTransmission))
+tGetParse th@THandle {params} = eitherList (tParse params) <$> tGetBlock th
 {-# INLINE tGetParse #-}
 
-tParse :: Bool -> ByteString -> NonEmpty (Either TransportError RawTransmission)
-tParse batch s
+tParse :: THandleParams v -> ByteString -> NonEmpty (Either TransportError RawTransmission)
+tParse thParams@THandleParams {batch} s
   | batch = eitherList (L.map (\(Large t) -> tParse1 t)) ts
   | otherwise = [tParse1 s]
   where
-    tParse1 = parse transmissionP TEBadBlock
+    tParse1 = parse (transmissionP thParams) TEBadBlock
     ts = parse smpP TEBadBlock s
 
 eitherList :: (a -> NonEmpty (Either e b)) -> Either e a -> NonEmpty (Either e b)
 eitherList = either (\e -> [Left e])
 
 -- | Receive client and server transmissions (determined by `cmd` type).
-tGet :: forall err cmd c. (ProtocolEncoding err cmd, Transport c) => THandle c -> IO (NonEmpty (SignedTransmission err cmd))
-tGet th@THandle {sessionId, thVersion = v} = L.map (tDecodeParseValidate sessionId v) <$> tGetParse th
+tGet :: forall v err cmd c. (ProtocolEncoding v err cmd, Transport c) => THandle v c -> IO (NonEmpty (SignedTransmission err cmd))
+tGet th@THandle {params} = L.map (tDecodeParseValidate params) <$> tGetParse th
 
-tDecodeParseValidate :: forall err cmd. ProtocolEncoding err cmd => SessionId -> Version -> Either TransportError RawTransmission -> SignedTransmission err cmd
-tDecodeParseValidate sessionId v = \case
-  Right RawTransmission {signature, signed, sessId, corrId, entityId, command}
-    | sessId == sessionId ->
-        let decodedTransmission = (,corrId,entityId,command) <$> C.decodeSignature signature
-         in either (const $ tError corrId) (tParseValidate signed) decodedTransmission
-    | otherwise -> (Nothing, "", (CorrId corrId, "", Left $ fromProtocolError @err @cmd PESession))
+tDecodeParseValidate :: forall v err cmd. ProtocolEncoding v err cmd => THandleParams v -> Either TransportError RawTransmission -> SignedTransmission err cmd
+tDecodeParseValidate THandleParams {sessionId, thVersion = v, implySessId} = \case
+  Right RawTransmission {authenticator, authorized, sessId, corrId, entityId, command}
+    | implySessId || sessId == sessionId ->
+        let decodedTransmission = (,corrId,entityId,command) <$> decodeTAuthBytes authenticator
+         in either (const $ tError corrId) (tParseValidate authorized) decodedTransmission
+    | otherwise -> (Nothing, "", (CorrId corrId, "", Left $ fromProtocolError @v @err @cmd PESession))
   Left _ -> tError ""
   where
     tError :: ByteString -> SignedTransmission err cmd
-    tError corrId = (Nothing, "", (CorrId corrId, "", Left $ fromProtocolError @err @cmd PEBlock))
+    tError corrId = (Nothing, "", (CorrId corrId, "", Left $ fromProtocolError @v @err @cmd PEBlock))
 
     tParseValidate :: ByteString -> SignedRawTransmission -> SignedTransmission err cmd
     tParseValidate signed t@(sig, corrId, entityId, command) =
-      let cmd = parseProtocol @err @cmd v command >>= checkCredentials t
+      let cmd = parseProtocol @v @err @cmd v command >>= checkCredentials t
        in (sig, signed, (CorrId corrId, entityId, cmd))
 
 $(J.deriveJSON defaultJSON ''MsgFlags)

src/Simplex/Messaging/Server.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
@@ -12,6 +13,7 @@
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TupleSections #-}
+{-# LANGUAGE TypeApplications #-}
 
 -- |
 -- Module      : Simplex.Messaging.Server
@@ -30,7 +32,7 @@ module Simplex.Messaging.Server
   ( runSMPServer,
     runSMPServerBlocking,
     disconnectTransport,
-    verifyCmdSignature,
+    verifyCmdAuthorization,
     dummyVerifyCmd,
     randomId,
   )
@@ -49,6 +51,7 @@ import qualified Data.ByteString.Char8 as B
 import Data.Either (fromRight, partitionEithers)
 import Data.Functor (($>))
 import Data.Int (Int64)
+import qualified Data.IntMap.Strict as IM
 import Data.List (intercalate)
 import qualified Data.List.NonEmpty as L
 import qualified Data.Map.Strict as M
@@ -83,8 +86,9 @@ import Simplex.Messaging.Transport.Buffer (trimCR)
 import Simplex.Messaging.Transport.Server
 import Simplex.Messaging.Util
 import System.Exit (exitFailure)
-import System.IO (hPutStrLn, hSetNewlineMode, universalNewlineMode)
+import System.IO (hPrint, hPutStrLn, hSetNewlineMode, universalNewlineMode)
 import System.Mem.Weak (deRefWeak)
+import UnliftIO (timeout)
 import UnliftIO.Concurrent
 import UnliftIO.Directory (doesFileExist, renameFile)
 import UnliftIO.Exception
@@ -117,8 +121,8 @@ type M a = ReaderT Env IO a
 smpServer :: TMVar Bool -> ServerConfig -> M ()
 smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
   s <- asks server
-  restoreServerMessages
-  restoreServerStats
+  expired <- restoreServerMessages
+  restoreServerStats expired
   raceAny_
     ( serverThread s "server subscribedQ" subscribedQ subscribers subscriptions cancelSub
         : serverThread s "server ntfSubscribedQ" ntfSubscribedQ Env.notifiers ntfSubscriptions (\_ -> pure ())
@@ -129,7 +133,10 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
     runServer :: (ServiceName, ATransport) -> M ()
     runServer (tcpPort, ATransport t) = do
       serverParams <- asks tlsServerParams
-      runTransportServer started tcpPort serverParams tCfg (runClient t)
+      ss <- asks sockets
+      serverSignKey <- either fail pure . fromTLSCredentials $ tlsServerCredentials serverParams
+      runTransportServerState ss started tcpPort serverParams tCfg (runClient serverSignKey t)
+    fromTLSCredentials (_, pk) = C.x509ToPrivate (pk, []) >>= C.privKey
 
     saveServer :: Bool -> M ()
     saveServer keepMsgs = withLog closeStoreLog >> saveServerMessages keepMsgs >> saveServerStats
@@ -143,17 +150,18 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
       (Client -> TMap QueueId s) ->
       (s -> IO ()) ->
       M ()
-    serverThread s label subQ subs clientSubs unsub = forever $ do
+    serverThread s label subQ subs clientSubs unsub = do
       labelMyThread label
-      atomically updateSubscribers
-        $>>= endPreviousSubscriptions
-        >>= liftIO . mapM_ unsub
+      forever $
+        atomically updateSubscribers
+          $>>= endPreviousSubscriptions
+          >>= liftIO . mapM_ unsub
       where
         updateSubscribers :: STM (Maybe (QueueId, Client))
         updateSubscribers = do
           (qId, clnt) <- readTQueue $ subQ s
           let clientToBeNotified c' =
-                if sameClientSession clnt c'
+                if sameClientId clnt c'
                   then pure Nothing
                   else do
                     yes <- readTVar $ connected c'
@@ -161,9 +169,12 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
           TM.lookupInsert qId clnt (subs s) $>>= clientToBeNotified
         endPreviousSubscriptions :: (QueueId, Client) -> M (Maybe s)
         endPreviousSubscriptions (qId, c) = do
-          labelMyThread $ label <> ".endPreviousSubscriptions"
-          void . forkIO . atomically $
-            writeTBQueue (sndQ c) [(CorrId "", qId, END)]
+          tId <- atomically $ stateTVar (endThreadSeq c) $ \next -> (next, next + 1)
+          t <- forkIO $ do
+            labelMyThread $ label <> ".endPreviousSubscriptions"
+            atomically $ writeTBQueue (sndQ c) [(CorrId "", qId, END)]
+            atomically $ modifyTVar' (endThreads c) $ IM.delete tId
+          mkWeakThreadId t >>= atomically . modifyTVar' (endThreads c) . IM.insert tId
           atomically $ TM.lookupDelete qId (clientSubs c)
 
     expireMessagesThread_ :: ServerConfig -> [M ()]
@@ -175,14 +186,16 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
       ms <- asks msgStore
       quota <- asks $ msgQueueQuota . config
       let interval = checkInterval expCfg * 1000000
+      stats <- asks serverStats
       labelMyThread "expireMessages"
       forever $ do
         liftIO $ threadDelay' interval
         old <- liftIO $ expireBeforeEpoch expCfg
         rIds <- M.keysSet <$> readTVarIO ms
-        forM_ rIds $ \rId ->
-          atomically (getMsgQueue ms rId quota)
-            >>= atomically . (`deleteExpiredMsgs` old)
+        forM_ rIds $ \rId -> do
+          q <- atomically (getMsgQueue ms rId quota)
+          deleted <- atomically $ deleteExpiredMsgs q old
+          atomically $ modifyTVar' (msgExpired stats) (+ deleted)
 
     serverStatsThread_ :: ServerConfig -> [M ()]
     serverStatsThread_ ServerConfig {logStatsInterval = Just interval, logStatsStartTime, serverStatsLogFile} =
@@ -195,18 +208,21 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
       initialDelay <- (startAt -) . fromIntegral . (`div` 1000000_000000) . diffTimeToPicoseconds . utctDayTime <$> liftIO getCurrentTime
       liftIO $ putStrLn $ "server stats log enabled: " <> statsFilePath
       liftIO $ threadDelay' $ 1000000 * (initialDelay + if initialDelay < 0 then 86400 else 0)
-      ServerStats {fromTime, qCreated, qSecured, qDeleted, msgSent, msgRecv, activeQueues, msgSentNtf, msgRecvNtf, activeQueuesNtf, qCount, msgCount} <- asks serverStats
+      ServerStats {fromTime, qCreated, qSecured, qDeletedAll, qDeletedNew, qDeletedSecured, msgSent, msgRecv, msgExpired, activeQueues, msgSentNtf, msgRecvNtf, activeQueuesNtf, qCount, msgCount} <- asks serverStats
       let interval = 1000000 * logInterval
-      withFile statsFilePath AppendMode $ \h -> liftIO $ do
-        hSetBuffering h LineBuffering
-        forever $ do
+      forever $ do
+        withFile statsFilePath AppendMode $ \h -> liftIO $ do
+          hSetBuffering h LineBuffering
           ts <- getCurrentTime
           fromTime' <- atomically $ swapTVar fromTime ts
           qCreated' <- atomically $ swapTVar qCreated 0
           qSecured' <- atomically $ swapTVar qSecured 0
-          qDeleted' <- atomically $ swapTVar qDeleted 0
+          qDeletedAll' <- atomically $ swapTVar qDeletedAll 0
+          qDeletedNew' <- atomically $ swapTVar qDeletedNew 0
+          qDeletedSecured' <- atomically $ swapTVar qDeletedSecured 0
           msgSent' <- atomically $ swapTVar msgSent 0
           msgRecv' <- atomically $ swapTVar msgRecv 0
+          msgExpired' <- atomically $ swapTVar msgExpired 0
           ps <- atomically $ periodStatCounts activeQueues ts
           msgSentNtf' <- atomically $ swapTVar msgSentNtf 0
           msgRecvNtf' <- atomically $ swapTVar msgRecvNtf 0
@@ -219,7 +235,7 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
               [ iso8601Show $ utctDay fromTime',
                 show qCreated',
                 show qSecured',
-                show qDeleted',
+                show qDeletedAll',
                 show msgSent',
                 show msgRecv',
                 dayCount ps,
@@ -231,18 +247,22 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
                 weekCount psNtf,
                 monthCount psNtf,
                 show qCount',
-                show msgCount'
+                show msgCount',
+                show msgExpired',
+                show qDeletedNew',
+                show qDeletedSecured'
               ]
-          threadDelay' interval
+        liftIO $ threadDelay' interval
 
-    runClient :: Transport c => TProxy c -> c -> M ()
-    runClient tp h = do
+    runClient :: Transport c => C.APrivateSignKey -> TProxy c -> c -> M ()
+    runClient signKey tp h = do
       kh <- asks serverIdentity
-      smpVRange <- asks $ smpServerVRange . config
+      ks <- atomically . C.generateKeyPair =<< asks random
+      ServerConfig {smpServerVRange, smpHandshakeTimeout} <- asks config
       labelMyThread $ "smp handshake for " <> transportName tp
-      liftIO (runExceptT $ smpServerHandshake h kh smpVRange) >>= \case
-        Right th -> runClientTransport th
-        Left _ -> pure ()
+      liftIO (timeout smpHandshakeTimeout . runExceptT $ smpServerHandshake signKey h ks kh smpServerVRange) >>= \case
+        Just (Right th) -> runClientTransport th
+        _ -> pure ()
 
     controlPortThread_ :: ServerConfig -> [M ()]
     controlPortThread_ ServerConfig {controlPort = Just port} = [runCPServer port]
@@ -276,20 +296,24 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
               CPSuspend -> hPutStrLn h "suspend not implemented"
               CPResume -> hPutStrLn h "resume not implemented"
               CPClients -> do
-                Server {subscribers} <- unliftIO u $ asks server
-                clients <- readTVarIO subscribers
-                hPutStrLn h $ "Clients: " <> show (length clients)
-                forM_ (M.toList clients) $ \(cid, Client {sessionId, connected, activeAt, subscriptions}) -> do
-                  hPutStrLn h . B.unpack $ "Client " <> encode cid <> " $" <> encode sessionId
-                  readTVarIO connected >>= hPutStrLn h . ("  connected: " <>) . show
-                  readTVarIO activeAt >>= hPutStrLn h . ("  activeAt: " <>) . B.unpack . strEncode
-                  readTVarIO subscriptions >>= hPutStrLn h . ("  subscriptions: " <>) . show . M.size
+                active <- unliftIO u (asks clients) >>= readTVarIO
+                hPutStrLn h $ "clientId,sessionId,connected,createdAt,rcvActiveAt,sndActiveAt,age,subscriptions"
+                forM_ (IM.toList active) $ \(cid, Client {sessionId, connected, createdAt, rcvActiveAt, sndActiveAt, subscriptions}) -> do
+                  connected' <- bshow <$> readTVarIO connected
+                  rcvActiveAt' <- strEncode <$> readTVarIO rcvActiveAt
+                  sndActiveAt' <- strEncode <$> readTVarIO sndActiveAt
+                  now <- liftIO getSystemTime
+                  let age = systemSeconds now - systemSeconds createdAt
+                  subscriptions' <- bshow . M.size <$> readTVarIO subscriptions
+                  hPutStrLn h . B.unpack $ B.intercalate "," [bshow cid, encode sessionId, connected', strEncode createdAt, rcvActiveAt', sndActiveAt', bshow age, subscriptions']
               CPStats -> do
-                ServerStats {fromTime, qCreated, qSecured, qDeleted, msgSent, msgRecv, msgSentNtf, msgRecvNtf, qCount, msgCount} <- unliftIO u $ asks serverStats
+                ServerStats {fromTime, qCreated, qSecured, qDeletedAll, qDeletedNew, qDeletedSecured, msgSent, msgRecv, msgSentNtf, msgRecvNtf, qCount, msgCount} <- unliftIO u $ asks serverStats
                 putStat "fromTime" fromTime
                 putStat "qCreated" qCreated
                 putStat "qSecured" qSecured
-                putStat "qDeleted" qDeleted
+                putStat "qDeletedAll" qDeletedAll
+                putStat "qDeletedNew" qDeletedNew
+                putStat "qDeletedSecured" qDeletedSecured
                 putStat "msgSent" msgSent
                 putStat "msgRecv" msgRecv
                 putStat "msgSentNtf" msgSentNtf
@@ -299,7 +323,7 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
                 where
                   putStat :: Show a => String -> TVar a -> IO ()
                   putStat label var = readTVarIO var >>= \v -> hPutStrLn h $ label <> ": " <> show v
-              CPStatsRTS -> getRTSStats >>= hPutStrLn h . show
+              CPStatsRTS -> getRTSStats >>= hPrint h
               CPThreads -> do
 #if MIN_VERSION_base(4,18,0)
                 threads <- liftIO listThreads
@@ -311,44 +335,92 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
 #else
                 hPutStrLn h "Not available on GHC 8.10"
 #endif
+              CPSockets -> do
+                (accepted', closed', active') <- unliftIO u $ asks sockets
+                (accepted, closed, active) <- atomically $ (,,) <$> readTVar accepted' <*> readTVar closed' <*> readTVar active'
+                hPutStrLn h "Sockets: "
+                hPutStrLn h $ "accepted: " <> show accepted
+                hPutStrLn h $ "closed: " <> show closed
+                hPutStrLn h $ "active: " <> show (IM.size active)
+                hPutStrLn h $ "leaked: " <> show (accepted - closed - IM.size active)
+              CPSocketThreads -> do
+#if MIN_VERSION_base(4,18,0)
+                (_, _, active') <- unliftIO u $ asks sockets
+                active <- readTVarIO active'
+                forM_ (IM.toList active) $ \(sid, tid') ->
+                  deRefWeak tid' >>= \case
+                    Nothing -> hPutStrLn h $ intercalate "," [show sid, "", "gone", ""]
+                    Just tid -> do
+                      label <- threadLabel tid
+                      status <- threadStatus tid
+                      hPutStrLn h $ intercalate "," [show sid, show tid, show status, fromMaybe "" label]
+#else
+                hPutStrLn h "Not available on GHC 8.10"
+#endif
+              CPDelete queueId' -> unliftIO u $ do
+                st <- asks queueStore
+                ms <- asks msgStore
+                queueId <- atomically (getQueue st SSender queueId') >>= \case
+                  Left _ -> pure queueId' -- fallback to using as recipientId directly
+                  Right QueueRec {recipientId} -> pure recipientId
+                r <- atomically $
+                  deleteQueue st queueId $>>= \q ->
+                    Right . (q,) <$> delMsgQueueSize ms queueId
+                case r of
+                  Left e -> liftIO . hPutStrLn h $ "error: " <> show e
+                  Right (q, numDeleted) -> do
+                    withLog (`logDeleteQueue` queueId)
+                    updateDeletedStats q
+                    liftIO . hPutStrLn h $ "ok, " <> show numDeleted <> " messages deleted"
               CPSave -> withLock (savingLock srv) "control" $ do
                 hPutStrLn h "saving server state..."
                 unliftIO u $ saveServer True
                 hPutStrLn h "server state saved!"
-              CPHelp -> hPutStrLn h "commands: stats, stats-rts, clients, threads, save, help, quit"
+              CPHelp -> hPutStrLn h "commands: stats, stats-rts, clients, sockets, socket-threads, threads, delete, save, help, quit"
               CPQuit -> pure ()
               CPSkip -> pure ()
 
-runClientTransport :: Transport c => THandle c -> M ()
-runClientTransport th@THandle {thVersion, sessionId} = do
+runClientTransport :: Transport c => THandleSMP c -> M ()
+runClientTransport th@THandle {params = THandleParams {thVersion, sessionId}} = do
   q <- asks $ tbqSize . config
   ts <- liftIO getSystemTime
-  c <- atomically $ newClient q thVersion sessionId ts
+  active <- asks clients
+  nextClientId <- asks clientSeq
+  c <- atomically $ do
+    new@Client {clientId} <- newClient nextClientId q thVersion sessionId ts
+    modifyTVar' active $ IM.insert clientId new
+    pure new
   s <- asks server
   expCfg <- asks $ inactiveClientExpiration . config
   labelMyThread . B.unpack $ "client $" <> encode sessionId
   raceAny_ ([liftIO $ send th c, client c s, receive th c] <> disconnectThread_ c expCfg)
     `finally` clientDisconnected c
   where
-    disconnectThread_ c (Just expCfg) = [liftIO $ disconnectTransport th c activeAt expCfg]
+    disconnectThread_ c (Just expCfg) = [liftIO $ disconnectTransport th (rcvActiveAt c) (sndActiveAt c) expCfg (noSubscriptions c)]
     disconnectThread_ _ _ = []
+    noSubscriptions c = atomically $ (&&) <$> TM.null (subscriptions c) <*> TM.null (ntfSubscriptions c)
 
 clientDisconnected :: Client -> M ()
-clientDisconnected c@Client {subscriptions, connected} = do
-  atomically $ writeTVar connected False
-  subs <- readTVarIO subscriptions
+clientDisconnected c@Client {clientId, subscriptions, connected, sessionId, endThreads} = do
+  labelMyThread . B.unpack $ "client $" <> encode sessionId <> " disc"
+  subs <- atomically $ do
+    writeTVar connected False
+    swapTVar subscriptions M.empty
   liftIO $ mapM_ cancelSub subs
-  atomically $ writeTVar subscriptions M.empty
-  cs <- asks $ subscribers . server
-  atomically . mapM_ (\rId -> TM.update deleteCurrentClient rId cs) $ M.keys subs
+  srvSubs <- asks $ subscribers . server
+  atomically $ modifyTVar' srvSubs $ \cs ->
+    M.foldrWithKey (\sub _ -> M.update deleteCurrentClient sub) cs subs
+  asks clients >>= atomically . (`modifyTVar'` IM.delete clientId)
+  tIds <- atomically $ swapTVar endThreads IM.empty
+  liftIO $ mapM_ (mapM_ killThread <=< deRefWeak) tIds
   where
     deleteCurrentClient :: Client -> Maybe Client
     deleteCurrentClient c'
-      | sameClientSession c c' = Nothing
+      | sameClientId c c' = Nothing
       | otherwise = Just c'
 
-sameClientSession :: Client -> Client -> Bool
-sameClientSession Client {sessionId} Client {sessionId = s'} = sessionId == s'
+sameClientId :: Client -> Client -> Bool
+sameClientId Client {clientId} Client {clientId = cId'} = clientId == cId'
 
 cancelSub :: TVar Sub -> IO ()
 cancelSub sub =
@@ -356,34 +428,35 @@ cancelSub sub =
     Sub {subThread = SubThread t} -> liftIO $ deRefWeak t >>= mapM_ killThread
     _ -> return ()
 
-receive :: Transport c => THandle c -> Client -> M ()
-receive th Client {rcvQ, sndQ, activeAt, sessionId} = do
+receive :: Transport c => THandleSMP c -> Client -> M ()
+receive th@THandle {params = THandleParams {thAuth}} Client {rcvQ, sndQ, rcvActiveAt, sessionId} = do
   labelMyThread . B.unpack $ "client $" <> encode sessionId <> " receive"
   forever $ do
     ts <- L.toList <$> liftIO (tGet th)
-    atomically . writeTVar activeAt =<< liftIO getSystemTime
+    atomically . writeTVar rcvActiveAt =<< liftIO getSystemTime
     as <- partitionEithers <$> mapM cmdAction ts
     write sndQ $ fst as
     write rcvQ $ snd as
   where
     cmdAction :: SignedTransmission ErrorType Cmd -> M (Either (Transmission BrokerMsg) (Maybe QueueRec, Transmission Cmd))
-    cmdAction (sig, signed, (corrId, queueId, cmdOrError)) =
+    cmdAction (tAuth, authorized, (corrId, queueId, cmdOrError)) =
       case cmdOrError of
         Left e -> pure $ Left (corrId, queueId, ERR e)
-        Right cmd -> verified <$> verifyTransmission sig signed queueId cmd
+        Right cmd -> verified <$> verifyTransmission ((,C.cbNonce (bs corrId)) <$> thAuth) tAuth authorized queueId cmd
           where
             verified = \case
               VRVerified qr -> Right (qr, (corrId, queueId, cmd))
               VRFailed -> Left (corrId, queueId, ERR AUTH)
     write q = mapM_ (atomically . writeTBQueue q) . L.nonEmpty
 
-send :: Transport c => THandle c -> Client -> IO ()
-send h@THandle {thVersion = v} Client {sndQ, sessionId, activeAt} = do
+send :: Transport c => THandleSMP c -> Client -> IO ()
+send h@THandle {params} Client {sndQ, sessionId, sndActiveAt} = do
   labelMyThread . B.unpack $ "client $" <> encode sessionId <> " send"
   forever $ do
     ts <- atomically $ L.sortWith tOrder <$> readTBQueue sndQ
-    void . liftIO . tPut h Nothing $ L.map ((Nothing,) . encodeTransmission v sessionId) ts
-    atomically . writeTVar activeAt =<< liftIO getSystemTime
+    -- TODO we can authorize responses as well
+    void . liftIO . tPut h $ L.map (\t -> Right (Nothing, encodeTransmission params t)) ts
+    atomically . writeTVar sndActiveAt =<< liftIO getSystemTime
   where
     tOrder :: Transmission BrokerMsg -> Int
     tOrder (_, _, cmd) = case cmd of
@@ -391,56 +464,84 @@ send h@THandle {thVersion = v} Client {sndQ, sessionId, activeAt} = do
       NMSG {} -> 0
       _ -> 1
 
-disconnectTransport :: Transport c => THandle c -> client -> (client -> TVar SystemTime) -> ExpirationConfig -> IO ()
-disconnectTransport THandle {connection, sessionId} c activeAt expCfg = do
+disconnectTransport :: Transport c => THandle v c -> TVar SystemTime -> TVar SystemTime -> ExpirationConfig -> IO Bool -> IO ()
+disconnectTransport THandle {connection, params = THandleParams {sessionId}} rcvActiveAt sndActiveAt expCfg noSubscriptions = do
   labelMyThread . B.unpack $ "client $" <> encode sessionId <> " disconnectTransport"
-  let interval = checkInterval expCfg * 1000000
-  forever . liftIO $ do
-    threadDelay' interval
-    old <- expireBeforeEpoch expCfg
-    ts <- readTVarIO $ activeAt c
-    when (systemSeconds ts < old) $ closeConnection connection
+  loop
+  where
+    loop = do
+      threadDelay' $ checkInterval expCfg * 1000000
+      ifM noSubscriptions checkExpired loop
+    checkExpired = do
+      old <- expireBeforeEpoch expCfg
+      ts <- max <$> readTVarIO rcvActiveAt <*> readTVarIO sndActiveAt
+      if systemSeconds ts < old then closeConnection connection else loop
 
 data VerificationResult = VRVerified (Maybe QueueRec) | VRFailed
 
-verifyTransmission :: Maybe C.ASignature -> ByteString -> QueueId -> Cmd -> M VerificationResult
-verifyTransmission sig_ signed queueId cmd =
+-- This function verifies queue command authorization, with the objective to have constant time between the three AUTH error scenarios:
+-- - the queue and party key exist, and the provided authorization has type matching queue key, but it is made with the different key.
+-- - the queue and party key exist, but the provided authorization has incorrect type.
+-- - the queue or party key do not exist.
+-- In all cases, the time of the verification should depend only on the provided authorization type,
+-- a dummy key is used to run verification in the last two cases, and failure is returned irrespective of the result.
+verifyTransmission :: Maybe (THandleAuth, C.CbNonce) -> Maybe TransmissionAuth -> ByteString -> QueueId -> Cmd -> M VerificationResult
+verifyTransmission auth_ tAuth authorized queueId cmd =
   case cmd of
-    Cmd SRecipient (NEW k _ _ _) -> pure $ Nothing `verified` verifyCmdSignature sig_ signed k
-    Cmd SRecipient _ -> verifyCmd SRecipient $ verifyCmdSignature sig_ signed . recipientKey
-    Cmd SSender SEND {} -> verifyCmd SSender $ verifyMaybe . senderKey
+    Cmd SRecipient (NEW k _ _ _) -> pure $ Nothing `verifiedWith` k
+    Cmd SRecipient _ -> verifyQueue (\q -> Just q `verifiedWith` recipientKey q) <$> get SRecipient
+    -- SEND will be accepted without authorization before the queue is secured with KEY command
+    Cmd SSender SEND {} -> verifyQueue (\q -> Just q `verified` maybe (isNothing tAuth) verify (senderKey q)) <$> get SSender
     Cmd SSender PING -> pure $ VRVerified Nothing
-    Cmd SNotifier NSUB -> verifyCmd SNotifier $ verifyMaybe . fmap notifierKey . notifier
+    -- NSUB will not be accepted without authorization
+    Cmd SNotifier NSUB -> verifyQueue (\q -> maybe dummyVerify (Just q `verifiedWith`) (notifierKey <$> notifier q)) <$> get SNotifier
   where
-    verifyCmd :: SParty p -> (QueueRec -> Bool) -> M VerificationResult
-    verifyCmd party f = do
-      st <- asks queueStore
-      q_ <- atomically $ getQueue st party queueId
-      pure $ case q_ of
-        Right q -> Just q `verified` f q
-        _ -> maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
-    verifyMaybe :: Maybe C.APublicVerifyKey -> Bool
-    verifyMaybe = maybe (isNothing sig_) $ verifyCmdSignature sig_ signed
+    verify = verifyCmdAuthorization auth_ tAuth authorized
+    dummyVerify = verify (dummyAuthKey tAuth) `seq` VRFailed
+    verifyQueue :: (QueueRec -> VerificationResult) -> Either ErrorType QueueRec -> VerificationResult
+    verifyQueue = either (\_ -> dummyVerify)
     verified q cond = if cond then VRVerified q else VRFailed
+    verifiedWith q k = q `verified` verify k
+    get :: SParty p -> M (Either ErrorType QueueRec)
+    get party = do
+      st <- asks queueStore
+      atomically $ getQueue st party queueId
 
-verifyCmdSignature :: Maybe C.ASignature -> ByteString -> C.APublicVerifyKey -> Bool
-verifyCmdSignature sig_ signed key = maybe False (verify key) sig_
+verifyCmdAuthorization :: Maybe (THandleAuth, C.CbNonce) -> Maybe TransmissionAuth -> ByteString -> C.APublicAuthKey -> Bool
+verifyCmdAuthorization auth_ tAuth authorized key = maybe False (verify key) tAuth
   where
-    verify :: C.APublicVerifyKey -> C.ASignature -> Bool
-    verify (C.APublicVerifyKey a k) sig@(C.ASignature a' s) =
-      case (testEquality a a', C.signatureSize k == C.signatureSize s) of
-        (Just Refl, True) -> C.verify' k s signed
-        _ -> dummyVerifyCmd signed sig `seq` False
+    verify :: C.APublicAuthKey -> TransmissionAuth -> Bool
+    verify (C.APublicAuthKey a k) = \case
+      TASignature (C.ASignature a' s) -> case testEquality a a' of
+        Just Refl -> C.verify' k s authorized
+        _ -> C.verify' (dummySignKey a') s authorized `seq` False
+      TAAuthenticator s -> case a of
+        C.SX25519 -> verifyCmdAuth auth_ k s authorized
+        _ -> verifyCmdAuth auth_ dummyKeyX25519 s authorized `seq` False
 
-dummyVerifyCmd :: ByteString -> C.ASignature -> Bool
-dummyVerifyCmd signed (C.ASignature _ s) = C.verify' (dummyPublicKey s) s signed
+verifyCmdAuth :: Maybe (THandleAuth, C.CbNonce) -> C.PublicKeyX25519 -> C.CbAuthenticator -> ByteString -> Bool
+verifyCmdAuth auth_ k authenticator authorized = case auth_ of
+  Just (THandleAuth {privKey}, nonce) -> C.cbVerify k privKey nonce authenticator authorized
+  Nothing -> False
+
+dummyVerifyCmd :: Maybe (THandleAuth, C.CbNonce) -> ByteString -> TransmissionAuth -> Bool
+dummyVerifyCmd auth_ authorized = \case
+  TASignature (C.ASignature a s) -> C.verify' (dummySignKey a) s authorized
+  TAAuthenticator s -> verifyCmdAuth auth_ dummyKeyX25519 s authorized
 
 -- These dummy keys are used with `dummyVerify` function to mitigate timing attacks
 -- by having the same time of the response whether a queue exists or nor, for all valid key/signature sizes
-dummyPublicKey :: C.Signature a -> C.PublicKey a
-dummyPublicKey = \case
-  C.SignatureEd25519 _ -> dummyKeyEd25519
-  C.SignatureEd448 _ -> dummyKeyEd448
+dummySignKey :: C.SignatureAlgorithm a => C.SAlgorithm a -> C.PublicKey a
+dummySignKey = \case
+  C.SEd25519 -> dummyKeyEd25519
+  C.SEd448 -> dummyKeyEd448
+
+dummyAuthKey :: Maybe TransmissionAuth -> C.APublicAuthKey
+dummyAuthKey = \case
+  Just (TASignature (C.ASignature a _)) -> case a of
+    C.SEd25519 -> C.APublicAuthKey C.SEd25519 dummyKeyEd25519
+    C.SEd448 -> C.APublicAuthKey C.SEd448 dummyKeyEd448
+  _ -> C.APublicAuthKey C.SX25519 dummyKeyX25519
 
 dummyKeyEd25519 :: C.PublicKey 'C.Ed25519
 dummyKeyEd25519 = "MCowBQYDK2VwAyEA139Oqs4QgpqbAmB0o7rZf6T19ryl7E65k4AYe0kE3Qs="
@@ -448,8 +549,11 @@ dummyKeyEd25519 = "MCowBQYDK2VwAyEA139Oqs4QgpqbAmB0o7rZf6T19ryl7E65k4AYe0kE3Qs="
 dummyKeyEd448 :: C.PublicKey 'C.Ed448
 dummyKeyEd448 = "MEMwBQYDK2VxAzoA6ibQc9XpkSLtwrf7PLvp81qW/etiumckVFImCMRdftcG/XopbOSaq9qyLhrgJWKOLyNrQPNVvpMA"
 
+dummyKeyX25519 :: C.PublicKey 'C.X25519
+dummyKeyX25519 = "MCowBQYDK2VuAyEA4JGSMYht18H4mas/jHeBwfcM7jLwNYJNOAhi2/g4RXg="
+
 client :: forall m. (MonadUnliftIO m, MonadReader Env m) => Client -> Server -> m ()
-client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ, sessionId} Server {subscribedQ, ntfSubscribedQ, notifiers} = do
+client clnt@Client {subscriptions, ntfSubscriptions, rcvQ, sndQ, sessionId} Server {subscribedQ, ntfSubscribedQ, notifiers} = do
   labelMyThread . B.unpack $ "client $" <> encode sessionId <> " commands"
   forever $
     atomically (readTBQueue rcvQ)
@@ -485,9 +589,9 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ, sess
             OFF -> suspendQueue_ st
             DEL -> delQueueAndMsgs st
       where
-        createQueue :: QueueStore -> RcvPublicVerifyKey -> RcvPublicDhKey -> SubscriptionMode -> m (Transmission BrokerMsg)
+        createQueue :: QueueStore -> RcvPublicAuthKey -> RcvPublicDhKey -> SubscriptionMode -> m (Transmission BrokerMsg)
         createQueue st recipientKey dhKey subMode = time "NEW" $ do
-          (rcvPublicDhKey, privDhKey) <- liftIO C.generateKeyPair'
+          (rcvPublicDhKey, privDhKey) <- atomically . C.generateKeyPair =<< asks random
           let rcvDhSecret = C.dh' dhKey privDhKey
               qik (rcvId, sndId) = QIK {rcvId, sndId, rcvPublicDhKey}
               qRec (recipientId, senderId) =
@@ -533,16 +637,16 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ, sess
               n <- asks $ queueIdBytes . config
               liftM2 (,) (randomId n) (randomId n)
 
-        secureQueue_ :: QueueStore -> SndPublicVerifyKey -> m (Transmission BrokerMsg)
+        secureQueue_ :: QueueStore -> SndPublicAuthKey -> m (Transmission BrokerMsg)
         secureQueue_ st sKey = time "KEY" $ do
           withLog $ \s -> logSecureQueue s queueId sKey
           stats <- asks serverStats
           atomically $ modifyTVar' (qSecured stats) (+ 1)
           atomically $ (corrId,queueId,) . either ERR (const OK) <$> secureQueue st queueId sKey
 
-        addQueueNotifier_ :: QueueStore -> NtfPublicVerifyKey -> RcvNtfPublicDhKey -> m (Transmission BrokerMsg)
+        addQueueNotifier_ :: QueueStore -> NtfPublicAuthKey -> RcvNtfPublicDhKey -> m (Transmission BrokerMsg)
         addQueueNotifier_ st notifierKey dhKey = time "NKEY" $ do
-          (rcvPublicDhKey, privDhKey) <- liftIO C.generateKeyPair'
+          (rcvPublicDhKey, privDhKey) <- atomically . C.generateKeyPair =<< asks random
           let rcvNtfDhSecret = C.dh' dhKey privDhKey
           (corrId,queueId,) <$> addNotifierRetry 3 rcvPublicDhKey rcvNtfDhSecret
           where
@@ -688,7 +792,7 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ, sess
                       Just msg -> time "SEND ok" $ do
                         stats <- asks serverStats
                         when (notification msgFlags) $ do
-                          atomically . trySendNotification msg =<< asks idsDrg
+                          atomically . trySendNotification msg =<< asks random
                           atomically $ modifyTVar' (msgSentNtf stats) (+ 1)
                           atomically $ updatePeriodStats (activeQueuesNtf stats) (recipientId qr)
                         atomically $ modifyTVar' (msgSent stats) (+ 1)
@@ -706,7 +810,9 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ, sess
             expireMessages q = do
               msgExp <- asks $ messageExpiration . config
               old <- liftIO $ mapM expireBeforeEpoch msgExp
-              atomically $ mapM_ (deleteExpiredMsgs q) old
+              stats <- asks serverStats
+              deleted <- atomically $ sum <$> mapM (deleteExpiredMsgs q) old
+              atomically $ modifyTVar' (msgExpired stats) (+ deleted)
 
             trySendNotification :: Message -> TVar ChaChaDRG -> STM ()
             trySendNotification msg ntfNonceDrg =
@@ -723,7 +829,7 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ, sess
 
             mkMessageNotification :: ByteString -> SystemTime -> RcvNtfDhSecret -> TVar ChaChaDRG -> STM (C.CbNonce, EncNMsgMeta)
             mkMessageNotification msgId msgTs rcvNtfDhSecret ntfNonceDrg = do
-              cbNonce <- C.pseudoRandomCbNonce ntfNonceDrg
+              cbNonce <- C.randomCbNonce ntfNonceDrg
               let msgMeta = NMsgMeta {msgId, msgTs}
                   encNMsgMeta = C.cbEncrypt rcvNtfDhSecret cbNonce (smpEncode msgMeta) 128
               pure . (cbNonce,) $ fromRight "" encNMsgMeta
@@ -748,6 +854,7 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ, sess
                 s -> s
               where
                 subscriber = do
+                  labelMyThread $ B.unpack ("client $" <> encode sessionId) <> " subscriber/" <> T.unpack name
                   msg <- atomically $ peekMsg q
                   time "subscriber" . atomically $ do
                     let encMsg = encryptMsg qr msg
@@ -760,17 +867,12 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ, sess
         time name = timed name queueId
 
         encryptMsg :: QueueRec -> Message -> RcvMessage
-        encryptMsg qr msg = case msg of
-          Message {msgFlags, msgBody}
-            | thVersion == 1 || thVersion == 2 -> encrypt msgFlags msgBody
-            | otherwise -> encrypt msgFlags $ encodeRcvMsgBody RcvMsgBody {msgTs = msgTs', msgFlags, msgBody}
-          MessageQuota {} ->
-            encrypt noMsgFlags $ encodeRcvMsgBody (RcvMsgQuota msgTs')
+        encryptMsg qr msg = encrypt . encodeRcvMsgBody $ case msg of
+          Message {msgFlags, msgBody} -> RcvMsgBody {msgTs = msgTs', msgFlags, msgBody}
+          MessageQuota {} -> RcvMsgQuota msgTs'
           where
-            encrypt :: KnownNat i => MsgFlags -> C.MaxLenBS i -> RcvMessage
-            encrypt msgFlags body =
-              let encBody = EncRcvMsgBody $ C.cbEncryptMaxLenBS (rcvDhSecret qr) (C.cbNonce msgId') body
-               in RcvMessage msgId' msgTs' msgFlags encBody
+            encrypt :: KnownNat i => C.MaxLenBS i -> RcvMessage
+            encrypt body = RcvMessage msgId' . EncRcvMsgBody $ C.cbEncryptMaxLenBS (rcvDhSecret qr) (C.cbNonce msgId') body
             msgId' = messageId msg
             msgTs' = messageTs msg
 
@@ -787,13 +889,9 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ, sess
         delQueueAndMsgs st = do
           withLog (`logDeleteQueue` queueId)
           ms <- asks msgStore
-          stats <- asks serverStats
-          atomically $ modifyTVar' (qDeleted stats) (+ 1)
-          atomically $ modifyTVar' (qCount stats) (subtract 1)
-          atomically $
-            deleteQueue st queueId >>= \case
-              Left e -> pure $ err e
-              Right _ -> delMsgQueue ms queueId $> ok
+          atomically (deleteQueue st queueId $>>= \q -> delMsgQueue ms queueId $> Right q) >>= \case
+            Right q -> updateDeletedStats q $> ok
+            Left e -> pure $ err e
 
         ok :: Transmission BrokerMsg
         ok = (corrId, queueId, OK)
@@ -804,6 +902,14 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ, sess
         okResp :: Either ErrorType () -> Transmission BrokerMsg
         okResp = either err $ const ok
 
+updateDeletedStats :: (MonadUnliftIO m, MonadReader Env m) => QueueRec -> m ()
+updateDeletedStats q = do
+  stats <- asks serverStats
+  let delSel = if isNothing (senderKey q) then qDeletedNew else qDeletedSecured
+  atomically $ modifyTVar' (delSel stats) (+ 1)
+  atomically $ modifyTVar' (qDeletedAll stats) (+ 1)
+  atomically $ modifyTVar' (qCount stats) (subtract 1)
+
 withLog :: (MonadUnliftIO m, MonadReader Env m) => (StoreLog 'WriteMode -> IO a) -> m ()
 withLog action = do
   env <- ask
@@ -822,9 +928,7 @@ timed name qId a = do
     sec = 1000_000000
 
 randomId :: (MonadUnliftIO m, MonadReader Env m) => Int -> m ByteString
-randomId n = do
-  gVar <- asks idsDrg
-  atomically (C.pseudoRandomBytes n gVar)
+randomId n = atomically . C.randomBytes n =<< asks random
 
 saveServerMessages :: (MonadUnliftIO m, MonadReader Env m) => Bool -> m ()
 saveServerMessages keepMsgs = asks (storeMsgsFile . config) >>= mapM_ saveMessages
@@ -841,45 +945,39 @@ saveServerMessages keepMsgs = asks (storeMsgsFile . config) >>= mapM_ saveMessag
           atomically (getMessages ms rId)
             >>= mapM_ (B.hPutStrLn h . strEncode . MLRv3 rId)
 
-restoreServerMessages :: forall m. (MonadUnliftIO m, MonadReader Env m) => m ()
-restoreServerMessages = asks (storeMsgsFile . config) >>= mapM_ restoreMessages
+restoreServerMessages :: forall m. (MonadUnliftIO m, MonadReader Env m) => m Int
+restoreServerMessages = asks (storeMsgsFile . config) >>= \case
+  Just f -> ifM (doesFileExist f) (restoreMessages f) (pure 0)
+  Nothing -> pure 0
   where
-    restoreMessages f = whenM (doesFileExist f) $ do
+    restoreMessages f = do
       logInfo $ "restoring messages from file " <> T.pack f
-      st <- asks queueStore
       ms <- asks msgStore
       quota <- asks $ msgQueueQuota . config
       old_ <- asks (messageExpiration . config) $>>= (liftIO . fmap Just . expireBeforeEpoch)
-      runExceptT (liftIO (B.readFile f) >>= mapM_ (restoreMsg st ms quota old_) . B.lines) >>= \case
+      runExceptT (liftIO (B.readFile f) >>= foldM (\expired -> restoreMsg expired ms quota old_) 0 . B.lines) >>= \case
         Left e -> do
           logError . T.pack $ "error restoring messages: " <> e
           liftIO exitFailure
-        _ -> do
+        Right expired -> do
           renameFile f $ f <> ".bak"
           logInfo "messages restored"
+          pure expired
       where
-        restoreMsg st ms quota old_ s = do
-          r <- liftEither . first (msgErr "parsing") $ strDecode s
-          case r of
-            MLRv3 rId msg -> addToMsgQueue rId msg
-            MLRv1 rId encMsg -> do
-              qr <- liftEitherError (msgErr "queue unknown") . atomically $ getQueue st SRecipient rId
-              msg' <- updateMsgV1toV3 qr encMsg
-              addToMsgQueue rId msg'
+        restoreMsg !expired ms quota old_ s = do
+          MLRv3 rId msg <- liftEither . first (msgErr "parsing") $ strDecode s
+          addToMsgQueue rId msg
           where
             addToMsgQueue rId msg = do
-              logFull <- atomically $ do
+              (isExpired, logFull) <- atomically $ do
                 q <- getMsgQueue ms rId quota
                 case msg of
                   Message {msgTs}
-                    | maybe True (systemSeconds msgTs >=) old_ -> isNothing <$> writeMsg q msg
-                    | otherwise -> pure False
-                  MessageQuota {} -> writeMsg q msg $> False
+                    | maybe True (systemSeconds msgTs >=) old_ -> (False,) . isNothing <$> writeMsg q msg
+                    | otherwise -> pure (True, False)
+                  MessageQuota {} -> writeMsg q msg $> (False, False)
               when logFull . logError . decodeLatin1 $ "message queue " <> strEncode rId <> " is full, message not restored: " <> strEncode (messageId msg)
-            updateMsgV1toV3 QueueRec {rcvDhSecret} RcvMessage {msgId, msgTs, msgFlags, msgBody = EncRcvMsgBody body} = do
-              let nonce = C.cbNonce msgId
-              msgBody <- liftEither . first (msgErr "v1 message decryption") $ C.maxLenBS =<< C.cbDecrypt rcvDhSecret nonce body
-              pure Message {msgId, msgTs, msgFlags, msgBody}
+              pure $ if isExpired then expired + 1 else expired
             msgErr :: Show e => String -> e -> String
             msgErr op e = op <> " error (" <> show e <> "): " <> B.unpack (B.take 100 s)
 
@@ -893,19 +991,21 @@ saveServerStats =
       B.writeFile f $ strEncode stats
       logInfo "server stats saved"
 
-restoreServerStats :: (MonadUnliftIO m, MonadReader Env m) => m ()
-restoreServerStats = asks (serverStatsBackupFile . config) >>= mapM_ restoreStats
+restoreServerStats :: (MonadUnliftIO m, MonadReader Env m) => Int -> m ()
+restoreServerStats expiredWhileRestoring = asks (serverStatsBackupFile . config) >>= mapM_ restoreStats
   where
     restoreStats f = whenM (doesFileExist f) $ do
       logInfo $ "restoring server stats from file " <> T.pack f
       liftIO (strDecode <$> B.readFile f) >>= \case
-        Right d -> do
+        Right d@ServerStatsData {_qCount = statsQCount} -> do
           s <- asks serverStats
-          _qCount <- fmap (length . M.keys) . readTVarIO . queues =<< asks queueStore
-          _msgCount <- foldM (\n q -> (n +) <$> readTVarIO (size q)) 0 =<< readTVarIO =<< asks msgStore
-          atomically $ setServerStats s d {_qCount, _msgCount}
+          _qCount <- fmap M.size . readTVarIO . queues =<< asks queueStore
+          _msgCount <- foldM (\(!n) q -> (n +) <$> readTVarIO (size q)) 0 =<< readTVarIO =<< asks msgStore
+          atomically $ setServerStats s d {_qCount, _msgCount, _msgExpired = _msgExpired d + expiredWhileRestoring}
           renameFile f $ f <> ".bak"
           logInfo "server stats restored"
+          when (_qCount /= statsQCount) $ logWarn $ "Queue count differs: stats: " <> tshow statsQCount <> ", store: " <> tshow _qCount
+          logInfo $ "Restored " <> tshow _msgCount <> " messages in " <> tshow _qCount <> " queues"
         Left e -> do
           logInfo $ "error restoring server stats: " <> T.pack e
           liftIO exitFailure

src/Simplex/Messaging/Server/CLI.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE ApplicativeDo #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
@@ -10,6 +11,7 @@
 module Simplex.Messaging.Server.CLI where
 
 import Control.Monad
+import Data.ASN1.Types (asn1CharacterToString)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Either (fromRight)
@@ -17,6 +19,8 @@ import Data.Ini (Ini, lookupValue)
 import Data.Text (Text)
 import qualified Data.Text as T
 import Data.Text.Encoding (encodeUtf8)
+import qualified Data.X509 as X
+import qualified Data.X509.File as XF
 import Data.X509.Validation (Fingerprint (..))
 import Network.Socket (HostName, ServiceName)
 import Options.Applicative
@@ -27,12 +31,14 @@ import Simplex.Messaging.Transport.Server (loadFingerprint)
 import Simplex.Messaging.Transport.WebSockets (WS)
 import Simplex.Messaging.Util (eitherToMaybe, whenM)
 import System.Directory (doesDirectoryExist, listDirectory, removeDirectoryRecursive, removePathForcibly)
+import System.Environment (lookupEnv)
 import System.Exit (exitFailure)
 import System.FilePath (combine)
 import System.IO (IOMode (..), hFlush, hGetLine, stdout, withFile)
 import System.Process (readCreateProcess, shell)
+import Text.Read (readMaybe)
 
-exitError :: String -> IO ()
+exitError :: String -> IO a
 exitError msg = putStrLn msg >> exitFailure
 
 confirmOrExit :: String -> IO ()
@@ -84,14 +90,18 @@ getCliCommand' cmdP version =
     versionOption = infoOption version (long "version" <> short 'v' <> help "Show version")
 
 createServerX509 :: FilePath -> X509Config -> IO ByteString
-createServerX509 cfgPath x509cfg = do
-  createOpensslCaConf
-  createOpensslServerConf
+createServerX509 = createServerX509_ True
+
+createServerX509_ :: Bool -> FilePath -> X509Config -> IO ByteString
+createServerX509_ createCA cfgPath x509cfg = do
   let alg = show $ signAlgorithm (x509cfg :: X509Config)
   -- CA certificate (identity/offline)
-  run $ "openssl genpkey -algorithm " <> alg <> " -out " <> c caKeyFile
-  run $ "openssl req -new -x509 -days 999999 -config " <> c opensslCaConfFile <> " -extensions v3 -key " <> c caKeyFile <> " -out " <> c caCrtFile
+  when createCA $ do
+    createOpensslCaConf
+    run $ "openssl genpkey -algorithm " <> alg <> " -out " <> c caKeyFile
+    run $ "openssl req -new -x509 -days 999999 -config " <> c opensslCaConfFile <> " -extensions v3 -key " <> c caKeyFile <> " -out " <> c caCrtFile
   -- server certificate (online)
+  createOpensslServerConf
   run $ "openssl genpkey -algorithm " <> alg <> " -out " <> c serverKeyFile
   run $ "openssl req -new -config " <> c opensslServerConfFile <> " -reqexts v3 -key " <> c serverKeyFile <> " -out " <> c serverCsrFile
   run $ "openssl x509 -req -days 999999 -extfile " <> c opensslServerConfFile <> " -extensions v3 -in " <> c serverCsrFile <> " -CA " <> c caCrtFile <> " -CAkey " <> c caKeyFile <> " -CAcreateserial -out " <> c serverCrtFile
@@ -131,6 +141,59 @@ createServerX509 cfgPath x509cfg = do
       withFile (c fingerprintFile) WriteMode (`B.hPutStrLn` strEncode fp)
       pure fp
 
+data CertOptions = CertOptions
+  { signAlgorithm_ :: Maybe SignAlgorithm,
+    commonName_ :: Maybe HostName
+  }
+  deriving (Show)
+
+certOptionsP :: Parser CertOptions
+certOptionsP = do
+  signAlgorithm_ <-
+    optional $
+      option
+        (maybeReader readMaybe)
+        ( long "sign-algorithm"
+            <> short 'a'
+            <> help "Set new signature algorithm used for TLS certificates: ED25519, ED448"
+            <> metavar "ALG"
+        )
+  commonName_ <-
+    optional $
+      strOption
+        ( long "cn"
+            <> help
+              "Set new Common Name for TLS online certificate"
+            <> metavar "FQDN"
+        )
+  pure CertOptions {signAlgorithm_, commonName_}
+
+genOnline :: FilePath -> CertOptions -> IO ()
+genOnline cfgPath CertOptions {signAlgorithm_, commonName_} = do
+  (signAlgorithm, commonName) <-
+    case (signAlgorithm_, commonName_) of
+      (Just alg, Just cn) -> pure (alg, cn)
+      _ ->
+        XF.readSignedObject certPath >>= \case
+          [old] -> either exitError pure . fromX509 . X.signedObject $ X.getSigned old
+          [] -> exitError $ "No certificate found at " <> certPath
+          _ -> exitError $ "Too many certificates at " <> certPath
+  let x509cfg = defaultX509Config {signAlgorithm, commonName}
+  void $ createServerX509_ False cfgPath x509cfg
+  putStrLn "Generated new server credentials"
+  warnCAPrivateKeyFile cfgPath x509cfg
+  where
+    certPath = combine cfgPath $ serverCrtFile defaultX509Config
+    fromX509 X.Certificate {certSignatureAlg, certSubjectDN} = (,) <$> maybe oldAlg Right signAlgorithm_ <*> maybe oldCN Right commonName_
+      where
+        oldAlg = case certSignatureAlg of
+          X.SignatureALG_IntrinsicHash X.PubKeyALG_Ed448 -> Right ED448
+          X.SignatureALG_IntrinsicHash X.PubKeyALG_Ed25519 -> Right ED25519
+          alg -> Left $ "Unexpected signature algorithm " <> show alg
+        oldCN = case X.getDnElement X.DnCommonName certSubjectDN of
+          Nothing -> Left "Certificate subject has no CN element"
+          Just cn -> maybe (Left "Certificate subject CN decoding failed") Right $ asn1CharacterToString cn
+
 warnCAPrivateKeyFile :: FilePath -> X509Config -> IO ()
 warnCAPrivateKeyFile cfgPath X509Config {caKeyFile} =
   putStrLn $
@@ -235,3 +298,6 @@ printServiceInfo serverVersion srv@(ProtoServerWithAuth ProtocolServer {keyHash}
 
 clearDirIfExists :: FilePath -> IO ()
 clearDirIfExists path = whenM (doesDirectoryExist path) $ listDirectory path >>= mapM_ (removePathForcibly . combine path)
+
+getEnvPath :: String -> FilePath -> IO FilePath
+getEnvPath name def = maybe def (\case "" -> def; f -> f) <$> lookupEnv name

src/Simplex/Messaging/Server/Control.hs

@@ -4,6 +4,7 @@
 module Simplex.Messaging.Server.Control where
 
 import qualified Data.Attoparsec.ByteString.Char8 as A
+import Data.ByteString (ByteString)
 import Simplex.Messaging.Encoding.String
 
 data ControlProtocol
@@ -13,6 +14,9 @@ data ControlProtocol
   | CPStats
   | CPStatsRTS
   | CPThreads
+  | CPSockets
+  | CPSocketThreads
+  | CPDelete ByteString
   | CPSave
   | CPHelp
   | CPQuit
@@ -26,6 +30,9 @@ instance StrEncoding ControlProtocol where
     CPStats -> "stats"
     CPStatsRTS -> "stats-rts"
     CPThreads -> "threads"
+    CPSockets -> "sockets"
+    CPSocketThreads -> "socket-threads"
+    CPDelete bs -> "delete " <> strEncode bs
     CPSave -> "save"
     CPHelp -> "help"
     CPQuit -> "quit"
@@ -38,6 +45,9 @@ instance StrEncoding ControlProtocol where
       "stats" -> pure CPStats
       "stats-rts" -> pure CPStatsRTS
       "threads" -> pure CPThreads
+      "sockets" -> pure CPSockets
+      "socket-threads" -> pure CPSocketThreads
+      "delete" -> CPDelete <$> (A.space *> strP)
       "save" -> pure CPSave
       "help" -> pure CPHelp
       "quit" -> pure CPQuit

src/Simplex/Messaging/Server/Env/STM.hs

@@ -10,6 +10,8 @@ import Control.Monad.IO.Unlift
 import Crypto.Random
 import Data.ByteString.Char8 (ByteString)
 import Data.Int (Int64)
+import Data.IntMap.Strict (IntMap)
+import qualified Data.IntMap.Strict as IM
 import Data.List.NonEmpty (NonEmpty)
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
@@ -21,6 +23,7 @@ import qualified Network.TLS as T
 import Numeric.Natural
 import Simplex.Messaging.Agent.Lock
 import Simplex.Messaging.Crypto (KeyHash (..))
+import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Protocol
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Server.MsgStore.STM
@@ -30,15 +33,15 @@ import Simplex.Messaging.Server.Stats
 import Simplex.Messaging.Server.StoreLog
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Transport (ATransport)
-import Simplex.Messaging.Transport.Server (TransportServerConfig, loadFingerprint, loadTLSServerParams)
-import Simplex.Messaging.Version
+import Simplex.Messaging.Transport (ATransport, VersionSMP, VersionRangeSMP)
+import Simplex.Messaging.Transport.Server (SocketState, TransportServerConfig, loadFingerprint, loadTLSServerParams, newSocketState)
 import System.IO (IOMode (..))
 import System.Mem.Weak (Weak)
 import UnliftIO.STM
 
 data ServerConfig = ServerConfig
   { transports :: [(ServiceName, ATransport)],
+    smpHandshakeTimeout :: Int,
     tbqSize :: Natural,
     -- serverTbqSize :: Natural,
     msgQueueQuota :: Int,
@@ -69,7 +72,7 @@ data ServerConfig = ServerConfig
     privateKeyFile :: FilePath,
     certificateFile :: FilePath,
     -- | SMP client-server protocol version range
-    smpServerVRange :: VersionRange,
+    smpServerVRange :: VersionRangeSMP,
     -- | TCP transport config
     transportConfig :: TransportServerConfig,
     -- | run listener on control port
@@ -89,8 +92,8 @@ defaultMessageExpiration =
 defaultInactiveClientExpiration :: ExpirationConfig
 defaultInactiveClientExpiration =
   ExpirationConfig
-    { ttl = 86400, -- seconds, 24 hours
-      checkInterval = 43200 -- seconds, 12 hours
+    { ttl = 43200, -- seconds, 12 hours
+      checkInterval = 3600 -- seconds, 1 hours
     }
 
 data Env = Env
@@ -99,10 +102,13 @@ data Env = Env
     serverIdentity :: KeyHash,
     queueStore :: QueueStore,
     msgStore :: STMMsgStore,
-    idsDrg :: TVar ChaChaDRG,
+    random :: TVar ChaChaDRG,
     storeLog :: Maybe (StoreLog 'WriteMode),
     tlsServerParams :: T.ServerParams,
-    serverStats :: ServerStats
+    serverStats :: ServerStats,
+    sockets :: SocketState,
+    clientSeq :: TVar Int,
+    clients :: TVar (IntMap Client)
   }
 
 data Server = Server
@@ -114,14 +120,19 @@ data Server = Server
   }
 
 data Client = Client
-  { subscriptions :: TMap RecipientId (TVar Sub),
+  { clientId :: Int,
+    subscriptions :: TMap RecipientId (TVar Sub),
     ntfSubscriptions :: TMap NotifierId (),
     rcvQ :: TBQueue (NonEmpty (Maybe QueueRec, Transmission Cmd)),
     sndQ :: TBQueue (NonEmpty (Transmission BrokerMsg)),
-    thVersion :: Version,
+    endThreads :: TVar (IntMap (Weak ThreadId)),
+    endThreadSeq :: TVar Int,
+    thVersion :: VersionSMP,
     sessionId :: ByteString,
     connected :: TVar Bool,
-    activeAt :: TVar SystemTime
+    createdAt :: SystemTime,
+    rcvActiveAt :: TVar SystemTime,
+    sndActiveAt :: TVar SystemTime
   }
 
 data SubscriptionThread = NoSub | SubPending | SubThread (Weak ThreadId) | ProhibitSub
@@ -140,15 +151,19 @@ newServer = do
   savingLock <- createLock
   return Server {subscribedQ, subscribers, ntfSubscribedQ, notifiers, savingLock}
 
-newClient :: Natural -> Version -> ByteString -> SystemTime -> STM Client
-newClient qSize thVersion sessionId ts = do
+newClient :: TVar Int -> Natural -> VersionSMP -> ByteString -> SystemTime -> STM Client
+newClient nextClientId qSize thVersion sessionId createdAt = do
+  clientId <- stateTVar nextClientId $ \next -> (next, next + 1)
   subscriptions <- TM.empty
   ntfSubscriptions <- TM.empty
   rcvQ <- newTBQueue qSize
   sndQ <- newTBQueue qSize
+  endThreads <- newTVar IM.empty
+  endThreadSeq <- newTVar 0
   connected <- newTVar True
-  activeAt <- newTVar ts
-  return Client {subscriptions, ntfSubscriptions, rcvQ, sndQ, thVersion, sessionId, connected, activeAt}
+  rcvActiveAt <- newTVar createdAt
+  sndActiveAt <- newTVar createdAt
+  return Client {clientId, subscriptions, ntfSubscriptions, rcvQ, sndQ, endThreads, endThreadSeq, thVersion, sessionId, connected, createdAt, rcvActiveAt, sndActiveAt}
 
 newSubscription :: SubscriptionThread -> STM Sub
 newSubscription subThread = do
@@ -160,13 +175,16 @@ newEnv config@ServerConfig {caCertificateFile, certificateFile, privateKeyFile,
   server <- atomically newServer
   queueStore <- atomically newQueueStore
   msgStore <- atomically newMsgStore
-  idsDrg <- drgNew >>= newTVarIO
+  random <- liftIO C.newRandom
   storeLog <- restoreQueues queueStore `mapM` storeLogFile
   tlsServerParams <- liftIO $ loadTLSServerParams caCertificateFile certificateFile privateKeyFile
   Fingerprint fp <- liftIO $ loadFingerprint caCertificateFile
   let serverIdentity = KeyHash fp
   serverStats <- atomically . newServerStats =<< liftIO getCurrentTime
-  return Env {config, server, serverIdentity, queueStore, msgStore, idsDrg, storeLog, tlsServerParams, serverStats}
+  sockets <- atomically newSocketState
+  clientSeq <- newTVarIO 0
+  clients <- newTVarIO mempty
+  return Env {config, server, serverIdentity, queueStore, msgStore, random, storeLog, tlsServerParams, serverStats, sockets, clientSeq, clients}
   where
     restoreQueues :: QueueStore -> FilePath -> m (StoreLog 'WriteMode)
     restoreQueues QueueStore {queues, senders, notifiers} f = do

src/Simplex/Messaging/Server/Main.hs

@@ -8,8 +8,8 @@
 
 module Simplex.Messaging.Server.Main where
 
+import Control.Concurrent.STM
 import Control.Monad (void)
-import Crypto.Random (getRandomBytes)
 import qualified Data.ByteString.Char8 as B
 import Data.Functor (($>))
 import Data.Ini (lookupValue, readIniFile)
@@ -25,7 +25,7 @@ import Simplex.Messaging.Server (runSMPServer)
 import Simplex.Messaging.Server.CLI
 import Simplex.Messaging.Server.Env.STM (ServerConfig (..), defMsgExpirationDays, defaultInactiveClientExpiration, defaultMessageExpiration)
 import Simplex.Messaging.Server.Expiration
-import Simplex.Messaging.Transport (simplexMQVersion, supportedSMPServerVRange)
+import Simplex.Messaging.Transport (simplexMQVersion, supportedServerSMPRelayVRange)
 import Simplex.Messaging.Transport.Client (TransportHost (..))
 import Simplex.Messaging.Transport.Server (TransportServerConfig (..), defaultTransportServerConfig)
 import Simplex.Messaging.Util (safeDecodeUtf8)
@@ -41,6 +41,10 @@ smpServerCLI cfgPath logPath =
       doesFileExist iniFile >>= \case
         True -> exitError $ "Error: server is already initialized (" <> iniFile <> " exists).\nRun `" <> executableName <> " start`."
         _ -> initializeServer opts
+    OnlineCert certOpts ->
+      doesFileExist iniFile >>= \case
+        True -> genOnline cfgPath certOpts
+        _ -> exitError $ "Error: server is not initialized (" <> iniFile <> " does not exist).\nRun `" <> executableName <> " init`."
     Start ->
       doesFileExist iniFile >>= \case
         True -> readIniFile iniFile >>= either exitError runServer
@@ -56,8 +60,8 @@ smpServerCLI cfgPath logPath =
     defaultServerPort = "5223"
     executableName = "smp-server"
     storeLogFilePath = combine logPath "smp-server-store.log"
-    initializeServer opts
-      | scripted opts = initialize opts
+    initializeServer opts@InitOptions {ip, fqdn, scripted}
+      | scripted = initialize opts
       | otherwise = do
           putStrLn "Use `smp-server init -h` for available options."
           void $ withPrompt "SMP server will be initialized (press Enter)" getLine
@@ -65,9 +69,9 @@ smpServerCLI cfgPath logPath =
           logStats <- onOffPrompt "Enable logging daily statistics" False
           putStrLn "Require a password to create new messaging queues?"
           password <- withPrompt "'r' for random (default), 'n' - no password, or enter password: " serverPassword
-          let host = fromMaybe (ip opts) (fqdn opts)
+          let host = fromMaybe ip fqdn
           host' <- withPrompt ("Enter server FQDN or IP address for certificate (" <> host <> "): ") getLine
-          initialize opts {enableStoreLog, logStats, fqdn = if null host' then fqdn opts else Just host', password}
+          initialize opts {enableStoreLog, logStats, fqdn = if null host' then fqdn else Just host', password}
       where
         serverPassword =
           getLine >>= \case
@@ -78,7 +82,7 @@ smpServerCLI cfgPath logPath =
               case strDecode $ encodeUtf8 $ T.pack s of
                 Right auth -> pure . Just $ ServerPassword auth
                 _ -> putStrLn "Invalid password. Only latin letters, digits and symbols other than '@' and ':' are allowed" >> serverPassword
-        initialize InitOptions {enableStoreLog, logStats, signAlgorithm, ip, fqdn, password} = do
+        initialize InitOptions {enableStoreLog, logStats, signAlgorithm, password} = do
           clearDirIfExists cfgPath
           clearDirIfExists logPath
           createDirectoryIfMissing True cfgPath
@@ -95,7 +99,7 @@ smpServerCLI cfgPath logPath =
           where
             createServerPassword = \case
               ServerPassword s -> pure s
-              SPRandom -> BasicAuth . strEncode <$> (getRandomBytes 32 :: IO B.ByteString)
+              SPRandom -> BasicAuth . strEncode <$> (atomically . C.randomBytes 32 =<< C.newRandom)
             iniFileContent host basicAuth =
               "[STORE_LOG]\n\
               \# The server uses STM memory for persistence,\n\
@@ -165,6 +169,7 @@ smpServerCLI cfgPath logPath =
         serverConfig =
           ServerConfig
             { transports = iniTransports ini,
+              smpHandshakeTimeout = 120000000,
               tbqSize = 64,
               -- serverTbqSize = 1024,
               msgQueueQuota = 128,
@@ -199,7 +204,7 @@ smpServerCLI cfgPath logPath =
               logStatsStartTime = 0, -- seconds from 00:00 UTC
               serverStatsLogFile = combine logPath "smp-server-stats.daily.log",
               serverStatsBackupFile = logStats $> combine logPath "smp-server-stats.log",
-              smpServerVRange = supportedSMPServerVRange,
+              smpServerVRange = supportedServerSMPRelayVRange,
               transportConfig =
                 defaultTransportServerConfig
                   { logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini
@@ -209,6 +214,7 @@ smpServerCLI cfgPath logPath =
 
 data CliCommand
   = Init InitOptions
+  | OnlineCert CertOptions
   | Start
   | Delete
 
@@ -230,6 +236,7 @@ cliCommandP :: FilePath -> FilePath -> FilePath -> Parser CliCommand
 cliCommandP cfgPath logPath iniFile =
   hsubparser
     ( command "init" (info (Init <$> initP) (progDesc $ "Initialize server - creates " <> cfgPath <> " and " <> logPath <> " directories and configuration files"))
+        <> command "cert" (info (OnlineCert <$> certOptionsP) (progDesc $ "Generate new online TLS server credentials (configuration: " <> iniFile <> ")"))
         <> command "start" (info (pure Start) (progDesc $ "Start server (configuration: " <> iniFile <> ")"))
         <> command "delete" (info (pure Delete) (progDesc "Delete configuration and log files"))
     )
@@ -254,7 +261,7 @@ cliCommandP cfgPath logPath iniFile =
           ( long "sign-algorithm"
               <> short 'a'
               <> help "Signature algorithm used for TLS certificates: ED25519, ED448"
-              <> value ED448
+              <> value ED25519
               <> showDefault
               <> metavar "ALG"
           )
@@ -294,3 +301,4 @@ cliCommandP cfgPath logPath iniFile =
       pure InitOptions {enableStoreLog, logStats, signAlgorithm, ip, fqdn, password, scripted}
     parseBasicAuth :: ReadM ServerPassword
     parseBasicAuth = eitherReader $ fmap ServerPassword . strDecode . B.pack
+

src/Simplex/Messaging/Server/MsgStore.hs

@@ -3,14 +3,11 @@
 
 module Simplex.Messaging.Server.MsgStore where
 
-import Control.Applicative ((<|>))
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (Message (..), RcvMessage (..), RecipientId)
+import Simplex.Messaging.Protocol (Message (..), RecipientId)
 
-data MsgLogRecord = MLRv3 RecipientId Message | MLRv1 RecipientId RcvMessage
+data MsgLogRecord = MLRv3 RecipientId Message
 
 instance StrEncoding MsgLogRecord where
-  strEncode = \case
-    MLRv3 rId msg -> strEncode (Str "v3", rId, msg)
-    MLRv1 rId msg -> strEncode (rId, msg)
-  strP = "v3 " *> (MLRv3 <$> strP_ <*> strP) <|> MLRv1 <$> strP_ <*> strP
+  strEncode (MLRv3 rId msg) = strEncode (Str "v3", rId, msg)
+  strP = "v3 " *> (MLRv3 <$> strP_ <*> strP)

src/Simplex/Messaging/Server/MsgStore/STM.hs

@@ -12,6 +12,7 @@ module Simplex.Messaging.Server.MsgStore.STM
     newMsgStore,
     getMsgQueue,
     delMsgQueue,
+    delMsgQueueSize,
     flushMsgQueue,
     snapshotMsgQueue,
     writeMsg,
@@ -24,7 +25,6 @@ module Simplex.Messaging.Server.MsgStore.STM
 where
 
 import Control.Concurrent.STM.TQueue (flushTQueue)
-import Control.Monad (when)
 import qualified Data.ByteString.Char8 as B
 import Data.Functor (($>))
 import Data.Int (Int64)
@@ -60,6 +60,9 @@ getMsgQueue st rId quota = maybe newQ pure =<< TM.lookup rId st
 delMsgQueue :: STMMsgStore -> RecipientId -> STM ()
 delMsgQueue st rId = TM.delete rId st
 
+delMsgQueueSize :: STMMsgStore -> RecipientId -> STM Int
+delMsgQueueSize st rId = TM.lookupDelete rId st >>= maybe (pure 0) (\MsgQueue {size} -> readTVar size)
+
 flushMsgQueue :: STMMsgStore -> RecipientId -> STM [Message]
 flushMsgQueue st rId = TM.lookupDelete rId st >>= maybe (pure []) (flushTQueue . msgQueue)
 
@@ -112,15 +115,15 @@ tryDelPeekMsg mq msgId' =
       | otherwise -> pure (Nothing, msg_)
     _ -> pure (Nothing, Nothing)
 
-deleteExpiredMsgs :: MsgQueue -> Int64 -> STM ()
-deleteExpiredMsgs mq old = loop
+deleteExpiredMsgs :: MsgQueue -> Int64 -> STM Int
+deleteExpiredMsgs mq old = loop 0
   where
-    loop = tryPeekMsg mq >>= mapM_ delOldMsg
-    delOldMsg = \case
-      Message {msgTs} ->
-        when (systemSeconds msgTs < old) $
-          tryDeleteMsg mq >> loop
-      _ -> pure ()
+    loop dc =
+      tryPeekMsg mq >>= \case
+        Just Message {msgTs}
+          | systemSeconds msgTs < old ->
+              tryDeleteMsg mq >> loop (dc + 1)
+        _ -> pure dc
 
 tryDeleteMsg :: MsgQueue -> STM ()
 tryDeleteMsg MsgQueue {msgQueue = q, size} =

src/Simplex/Messaging/Server/QueueStore.hs

@@ -10,21 +10,21 @@ import Simplex.Messaging.Protocol
 
 data QueueRec = QueueRec
   { recipientId :: !RecipientId,
-    recipientKey :: !RcvPublicVerifyKey,
+    recipientKey :: !RcvPublicAuthKey,
     rcvDhSecret :: !RcvDhSecret,
     senderId :: !SenderId,
-    senderKey :: !(Maybe SndPublicVerifyKey),
+    senderKey :: !(Maybe SndPublicAuthKey),
     notifier :: !(Maybe NtfCreds),
     status :: !ServerQueueStatus
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 data NtfCreds = NtfCreds
   { notifierId :: !NotifierId,
-    notifierKey :: !NtfPublicVerifyKey,
+    notifierKey :: !NtfPublicAuthKey,
     rcvNtfDhSecret :: !RcvNtfDhSecret
   }
-  deriving (Eq, Show)
+  deriving (Show)
 
 instance StrEncoding NtfCreds where
   strEncode NtfCreds {notifierId, notifierKey, rcvNtfDhSecret} = strEncode (notifierId, notifierKey, rcvNtfDhSecret)

src/Simplex/Messaging/Server/QueueStore/STM.hs

@@ -63,7 +63,7 @@ getQueue QueueStore {queues, senders, notifiers} party qId =
       SSender -> TM.lookup qId senders $>>= (`TM.lookup` queues)
       SNotifier -> TM.lookup qId notifiers $>>= (`TM.lookup` queues)
 
-secureQueue :: QueueStore -> RecipientId -> SndPublicVerifyKey -> STM (Either ErrorType QueueRec)
+secureQueue :: QueueStore -> RecipientId -> SndPublicAuthKey -> STM (Either ErrorType QueueRec)
 secureQueue QueueStore {queues} rId sKey =
   withQueue rId queues $ \qVar ->
     readTVar qVar >>= \q -> case senderKey q of
@@ -94,14 +94,14 @@ suspendQueue :: QueueStore -> RecipientId -> STM (Either ErrorType ())
 suspendQueue QueueStore {queues} rId =
   withQueue rId queues $ \qVar -> modifyTVar' qVar (\q -> q {status = QueueOff}) $> Just ()
 
-deleteQueue :: QueueStore -> RecipientId -> STM (Either ErrorType ())
+deleteQueue :: QueueStore -> RecipientId -> STM (Either ErrorType QueueRec)
 deleteQueue QueueStore {queues, senders, notifiers} rId = do
   TM.lookupDelete rId queues >>= \case
     Just qVar ->
       readTVar qVar >>= \q -> do
         TM.delete (senderId q) senders
         forM_ (notifier q) $ \NtfCreds {notifierId} -> TM.delete notifierId notifiers
-        pure $ Right ()
+        pure $ Right q
     _ -> pure $ Left AUTH
 
 toResult :: Maybe a -> Either ErrorType a

src/Simplex/Messaging/Server/Stats.hs

@@ -3,6 +3,7 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TupleSections #-}
 
 module Simplex.Messaging.Server.Stats where
 
@@ -11,7 +12,7 @@ import qualified Data.Attoparsec.ByteString.Char8 as A
 import qualified Data.ByteString.Char8 as B
 import Data.Set (Set)
 import qualified Data.Set as S
-import Data.Time.Calendar.Month.Compat (pattern MonthDay)
+import Data.Time.Calendar.Month (pattern MonthDay)
 import Data.Time.Calendar.OrdinalDate (mondayStartWeek)
 import Data.Time.Clock (UTCTime (..))
 import Simplex.Messaging.Encoding.String
@@ -22,9 +23,12 @@ data ServerStats = ServerStats
   { fromTime :: TVar UTCTime,
     qCreated :: TVar Int,
     qSecured :: TVar Int,
-    qDeleted :: TVar Int,
+    qDeletedAll :: TVar Int,
+    qDeletedNew :: TVar Int,
+    qDeletedSecured :: TVar Int,
     msgSent :: TVar Int,
     msgRecv :: TVar Int,
+    msgExpired :: TVar Int,
     activeQueues :: PeriodStats RecipientId,
     msgSentNtf :: TVar Int,
     msgRecvNtf :: TVar Int,
@@ -37,9 +41,12 @@ data ServerStatsData = ServerStatsData
   { _fromTime :: UTCTime,
     _qCreated :: Int,
     _qSecured :: Int,
-    _qDeleted :: Int,
+    _qDeletedAll :: Int,
+    _qDeletedNew :: Int,
+    _qDeletedSecured :: Int,
     _msgSent :: Int,
     _msgRecv :: Int,
+    _msgExpired :: Int,
     _activeQueues :: PeriodStatsData RecipientId,
     _msgSentNtf :: Int,
     _msgRecvNtf :: Int,
@@ -54,41 +61,50 @@ newServerStats ts = do
   fromTime <- newTVar ts
   qCreated <- newTVar 0
   qSecured <- newTVar 0
-  qDeleted <- newTVar 0
+  qDeletedAll <- newTVar 0
+  qDeletedNew <- newTVar 0
+  qDeletedSecured <- newTVar 0
   msgSent <- newTVar 0
   msgRecv <- newTVar 0
+  msgExpired <- newTVar 0
   activeQueues <- newPeriodStats
   msgSentNtf <- newTVar 0
   msgRecvNtf <- newTVar 0
   activeQueuesNtf <- newPeriodStats
   qCount <- newTVar 0
   msgCount <- newTVar 0
-  pure ServerStats {fromTime, qCreated, qSecured, qDeleted, msgSent, msgRecv, activeQueues, msgSentNtf, msgRecvNtf, activeQueuesNtf, qCount, msgCount}
+  pure ServerStats {fromTime, qCreated, qSecured, qDeletedAll, qDeletedNew, qDeletedSecured, msgSent, msgRecv, msgExpired, activeQueues, msgSentNtf, msgRecvNtf, activeQueuesNtf, qCount, msgCount}
 
 getServerStatsData :: ServerStats -> STM ServerStatsData
 getServerStatsData s = do
   _fromTime <- readTVar $ fromTime s
   _qCreated <- readTVar $ qCreated s
   _qSecured <- readTVar $ qSecured s
-  _qDeleted <- readTVar $ qDeleted s
+  _qDeletedAll <- readTVar $ qDeletedAll s
+  _qDeletedNew <- readTVar $ qDeletedNew s
+  _qDeletedSecured <- readTVar $ qDeletedSecured s
   _msgSent <- readTVar $ msgSent s
   _msgRecv <- readTVar $ msgRecv s
+  _msgExpired <- readTVar $ msgExpired s
   _activeQueues <- getPeriodStatsData $ activeQueues s
   _msgSentNtf <- readTVar $ msgSentNtf s
   _msgRecvNtf <- readTVar $ msgRecvNtf s
   _activeQueuesNtf <- getPeriodStatsData $ activeQueuesNtf s
   _qCount <- readTVar $ qCount s
   _msgCount <- readTVar $ msgCount s
-  pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _activeQueues, _msgSentNtf, _msgRecvNtf, _activeQueuesNtf, _qCount, _msgCount}
+  pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeletedAll, _qDeletedNew, _qDeletedSecured, _msgSent, _msgRecv, _msgExpired, _activeQueues, _msgSentNtf, _msgRecvNtf, _activeQueuesNtf, _qCount, _msgCount}
 
 setServerStats :: ServerStats -> ServerStatsData -> STM ()
 setServerStats s d = do
   writeTVar (fromTime s) $! _fromTime d
   writeTVar (qCreated s) $! _qCreated d
   writeTVar (qSecured s) $! _qSecured d
-  writeTVar (qDeleted s) $! _qDeleted d
+  writeTVar (qDeletedAll s) $! _qDeletedAll d
+  writeTVar (qDeletedNew s) $! _qDeletedNew d
+  writeTVar (qDeletedSecured s) $! _qDeletedSecured d
   writeTVar (msgSent s) $! _msgSent d
   writeTVar (msgRecv s) $! _msgRecv d
+  writeTVar (msgExpired s) $! _msgExpired d
   setPeriodStats (activeQueues s) (_activeQueues d)
   writeTVar (msgSentNtf s) $! _msgSentNtf d
   writeTVar (msgRecvNtf s) $! _msgRecvNtf d
@@ -97,14 +113,18 @@ setServerStats s d = do
   writeTVar (msgCount s) $! _msgCount d
 
 instance StrEncoding ServerStatsData where
-  strEncode ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _msgSentNtf, _msgRecvNtf, _activeQueues, _activeQueuesNtf} =
+  strEncode ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeletedAll, _qDeletedNew, _qDeletedSecured, _msgSent, _msgRecv, _msgExpired, _msgSentNtf, _msgRecvNtf, _activeQueues, _activeQueuesNtf, _qCount, _msgCount} =
     B.unlines
       [ "fromTime=" <> strEncode _fromTime,
         "qCreated=" <> strEncode _qCreated,
         "qSecured=" <> strEncode _qSecured,
-        "qDeleted=" <> strEncode _qDeleted,
+        "qDeletedAll=" <> strEncode _qDeletedAll,
+        "qDeletedNew=" <> strEncode _qDeletedNew,
+        "qDeletedSecured=" <> strEncode _qDeletedSecured,
+        "qCount=" <> strEncode _qCount,
         "msgSent=" <> strEncode _msgSent,
         "msgRecv=" <> strEncode _msgRecv,
+        "msgExpired=" <> strEncode _msgExpired,
         "msgSentNtf=" <> strEncode _msgSentNtf,
         "msgRecvNtf=" <> strEncode _msgRecvNtf,
         "activeQueues:",
@@ -116,9 +136,13 @@ instance StrEncoding ServerStatsData where
     _fromTime <- "fromTime=" *> strP <* A.endOfLine
     _qCreated <- "qCreated=" *> strP <* A.endOfLine
     _qSecured <- "qSecured=" *> strP <* A.endOfLine
-    _qDeleted <- "qDeleted=" *> strP <* A.endOfLine
+    (_qDeletedAll, _qDeletedNew, _qDeletedSecured) <-
+      (,0,0) <$> ("qDeleted=" *> strP <* A.endOfLine)
+        <|> ((,,) <$> ("qDeletedAll=" *> strP <* A.endOfLine) <*> ("qDeletedNew=" *> strP <* A.endOfLine) <*> ("qDeletedSecured=" *> strP <* A.endOfLine))
+    _qCount <- "qCount=" *> strP <* A.endOfLine <|> pure 0
     _msgSent <- "msgSent=" *> strP <* A.endOfLine
     _msgRecv <- "msgRecv=" *> strP <* A.endOfLine
+    _msgExpired <- "msgExpired=" *> strP <* A.endOfLine <|> pure 0
     _msgSentNtf <- "msgSentNtf=" *> strP <* A.endOfLine <|> pure 0
     _msgRecvNtf <- "msgRecvNtf=" *> strP <* A.endOfLine <|> pure 0
     _activeQueues <-
@@ -133,7 +157,7 @@ instance StrEncoding ServerStatsData where
       optional ("activeQueuesNtf:" <* A.endOfLine) >>= \case
         Just _ -> strP <* optional A.endOfLine
         _ -> pure newPeriodStatsData
-    pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _msgSentNtf, _msgRecvNtf, _activeQueues, _activeQueuesNtf, _qCount = 0, _msgCount = 0}
+    pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeletedAll, _qDeletedNew, _qDeletedSecured, _msgSent, _msgRecv, _msgExpired, _msgSentNtf, _msgRecvNtf, _activeQueues, _activeQueuesNtf, _qCount, _msgCount = 0}
 
 data PeriodStats a = PeriodStats
   { day :: TVar (Set a),

src/Simplex/Messaging/Server/StoreLog.hs

@@ -46,7 +46,7 @@ data StoreLog (a :: IOMode) where
 
 data StoreLogRecord
   = CreateQueue QueueRec
-  | SecureQueue QueueId SndPublicVerifyKey
+  | SecureQueue QueueId SndPublicAuthKey
   | AddNotifier QueueId NtfCreds
   | SuspendQueue QueueId
   | DeleteQueue QueueId
@@ -114,13 +114,13 @@ closeStoreLog = \case
 
 writeStoreLogRecord :: StrEncoding r => StoreLog 'WriteMode -> r -> IO ()
 writeStoreLogRecord (WriteStoreLog _ h) r = do
-  B.hPutStrLn h $ strEncode r
+  B.hPut h $ strEncode r `B.snoc` '\n' -- hPutStrLn makes write non-atomic for length > 1024
   hFlush h
 
 logCreateQueue :: StoreLog 'WriteMode -> QueueRec -> IO ()
 logCreateQueue s = writeStoreLogRecord s . CreateQueue
 
-logSecureQueue :: StoreLog 'WriteMode -> QueueId -> SndPublicVerifyKey -> IO ()
+logSecureQueue :: StoreLog 'WriteMode -> QueueId -> SndPublicAuthKey -> IO ()
 logSecureQueue s qId sKey = writeStoreLogRecord s $ SecureQueue qId sKey
 
 logAddNotifier :: StoreLog 'WriteMode -> QueueId -> NtfCreds -> IO ()

src/Simplex/Messaging/ServiceScheme.hs

@@ -0,0 +1,35 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.Messaging.ServiceScheme where
+
+import Control.Applicative ((<|>))
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import qualified Data.ByteString.Char8 as B
+import Data.Functor (($>))
+import Network.Socket (HostName, ServiceName)
+import Simplex.Messaging.Encoding.String (StrEncoding (..))
+
+data ServiceScheme = SSSimplex | SSAppServer SrvLoc
+  deriving (Eq, Show)
+
+instance StrEncoding ServiceScheme where
+  strEncode = \case
+    SSSimplex -> "simplex:"
+    SSAppServer srv -> "https://" <> strEncode srv
+  strP =
+    "simplex:" $> SSSimplex
+      <|> "https://" *> (SSAppServer <$> strP)
+
+data SrvLoc = SrvLoc HostName ServiceName
+  deriving (Eq, Ord, Show)
+
+instance StrEncoding SrvLoc where
+  strEncode (SrvLoc host port) = B.pack $ host <> if null port then "" else ':' : port
+  strP = SrvLoc <$> host <*> (port <|> pure "")
+    where
+      host = B.unpack <$> A.takeWhile1 (A.notInClass ":#,;/ ")
+      port = show <$> (A.char ':' *> (A.decimal :: A.Parser Int))
+
+simplexChat :: ServiceScheme
+simplexChat = SSAppServer $ SrvLoc "simplex.chat" ""

src/Simplex/Messaging/Transport.hs

@@ -5,9 +5,11 @@
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE InstanceSigs #-}
+{-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TypeApplications #-}
@@ -26,7 +28,18 @@
 -- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#appendix-a
 module Simplex.Messaging.Transport
   ( -- * SMP transport parameters
-    supportedSMPServerVRange,
+    SMPVersion,
+    VersionSMP,
+    VersionRangeSMP,
+    THandleSMP,
+    supportedClientSMPRelayVRange,
+    supportedServerSMPRelayVRange,
+    currentClientSMPRelayVersion,
+    currentServerSMPRelayVersion,
+    batchCmdsSMPVersion,
+    basicAuthSMPVersion,
+    subModeSMPVersion,
+    authCmdsSMPVersion,
     simplexMQVersion,
     smpBlockSize,
     TransportConfig (..),
@@ -36,6 +49,7 @@ module Simplex.Messaging.Transport
     TProxy (..),
     ATransport (..),
     TransportPeer (..),
+    getServerVerifyKey,
 
     -- * TLS Transport
     TLS (..),
@@ -47,6 +61,8 @@ module Simplex.Messaging.Transport
 
     -- * SMP transport
     THandle (..),
+    THandleParams (..),
+    THandleAuth (..),
     TransportError (..),
     HandshakeError (..),
     smpServerHandshake,
@@ -61,18 +77,23 @@ module Simplex.Messaging.Transport
 where
 
 import Control.Applicative ((<|>))
+import Control.Monad (forM)
 import Control.Monad.Except
 import Control.Monad.Trans.Except (throwE)
 import qualified Data.Aeson.TH as J
 import Data.Attoparsec.ByteString.Char8 (Parser)
-import Data.Bifunctor (first)
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import Data.Bifunctor (bimap, first)
 import Data.Bitraversable (bimapM)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
-import qualified Data.ByteString.Lazy as BL
+import qualified Data.ByteString.Lazy.Char8 as LB
 import Data.Default (def)
 import Data.Functor (($>))
 import Data.Version (showVersion)
+import Data.Word (Word16)
+import qualified Data.X509 as X
+import qualified Data.X509.Validation as XV
 import GHC.IO.Handle.Internals (ioe_EOF)
 import Network.Socket
 import qualified Network.TLS as T
@@ -80,10 +101,11 @@ import qualified Network.TLS.Extra as TE
 import qualified Paths_simplexmq as SMQ
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
-import Simplex.Messaging.Parsers (dropPrefix, parse, parseRead1, sumTypeJSON)
+import Simplex.Messaging.Parsers (dropPrefix, parseRead1, sumTypeJSON)
 import Simplex.Messaging.Transport.Buffer
-import Simplex.Messaging.Util (bshow, catchAll, catchAll_)
+import Simplex.Messaging.Util (bshow, catchAll, catchAll_, liftEitherWith)
 import Simplex.Messaging.Version
+import Simplex.Messaging.Version.Internal
 import UnliftIO.Exception (Exception)
 import qualified UnliftIO.Exception as E
 import UnliftIO.STM
@@ -93,8 +115,51 @@ import UnliftIO.STM
 smpBlockSize :: Int
 smpBlockSize = 16384
 
-supportedSMPServerVRange :: VersionRange
-supportedSMPServerVRange = mkVersionRange 1 6
+-- SMP protocol version history:
+-- 1 - binary protocol encoding (1/1/2022)
+-- 2 - message flags (used to control notifications, 6/6/2022)
+-- 3 - encrypt message timestamp and flags together with the body when delivered to the recipient (7/5/2022)
+-- 4 - support command batching (7/17/2022)
+-- 5 - basic auth for SMP servers (11/12/2022)
+-- 6 - allow creating queues without subscribing (9/10/2023)
+-- 7 - support authenticated encryption to verify senders' commands, imply but do NOT send session ID in signed part (2/3/2024)
+
+data SMPVersion
+
+instance VersionScope SMPVersion
+
+type VersionSMP = Version SMPVersion
+
+type VersionRangeSMP = VersionRange SMPVersion
+
+pattern VersionSMP :: Word16 -> VersionSMP
+pattern VersionSMP v = Version v
+
+batchCmdsSMPVersion :: VersionSMP
+batchCmdsSMPVersion = VersionSMP 4
+
+basicAuthSMPVersion :: VersionSMP
+basicAuthSMPVersion = VersionSMP 5
+
+subModeSMPVersion :: VersionSMP
+subModeSMPVersion = VersionSMP 6
+
+authCmdsSMPVersion :: VersionSMP
+authCmdsSMPVersion = VersionSMP 7
+
+currentClientSMPRelayVersion :: VersionSMP
+currentClientSMPRelayVersion = VersionSMP 6
+
+currentServerSMPRelayVersion :: VersionSMP
+currentServerSMPRelayVersion = VersionSMP 6
+
+-- minimal supported protocol version is 4
+-- TODO remove code that supports sending commands without batching
+supportedClientSMPRelayVRange :: VersionRangeSMP
+supportedClientSMPRelayVRange = mkVersionRange batchCmdsSMPVersion currentClientSMPRelayVersion
+
+supportedServerSMPRelayVRange :: VersionRangeSMP
+supportedServerSMPRelayVRange = mkVersionRange batchCmdsSMPVersion currentServerSMPRelayVersion
 
 simplexMQVersion :: String
 simplexMQVersion = showVersion SMQ.version
@@ -117,10 +182,12 @@ class Transport c where
   transportConfig :: c -> TransportConfig
 
   -- | Upgrade server TLS context to connection (used in the server)
-  getServerConnection :: TransportConfig -> T.Context -> IO c
+  getServerConnection :: TransportConfig -> X.CertificateChain -> T.Context -> IO c
 
   -- | Upgrade client TLS context to connection (used in the client)
-  getClientConnection :: TransportConfig -> T.Context -> IO c
+  getClientConnection :: TransportConfig -> X.CertificateChain -> T.Context -> IO c
+
+  getServerCerts :: c -> X.CertificateChain
 
   -- | tls-unique channel binding per RFC5929
   tlsUnique :: c -> SessionId
@@ -148,6 +215,12 @@ data TProxy c = TProxy
 
 data ATransport = forall c. Transport c => ATransport (TProxy c)
 
+getServerVerifyKey :: Transport c => c -> Either String C.APublicVerifyKey
+getServerVerifyKey c =
+  case getServerCerts c of
+    X.CertificateChain (server : _ca) -> C.x509ToPublic (X.certPubKey . X.signedObject $ X.getSigned server, []) >>= C.pubKey
+    _ -> Left "no certificate chain"
+
 -- * TLS Transport
 
 data TLS = TLS
@@ -155,6 +228,7 @@ data TLS = TLS
     tlsPeer :: TransportPeer,
     tlsUniq :: ByteString,
     tlsBuffer :: TBuffer,
+    tlsServerCerts :: X.CertificateChain,
     tlsTransportConfig :: TransportConfig
   }
 
@@ -167,12 +241,12 @@ connectTLS host_ TransportConfig {logTLSErrors} params sock =
     logThrow e = putStrLn ("TLS error" <> host <> ": " <> show e) >> E.throwIO e
     host = maybe "" (\h -> " (" <> h <> ")") host_
 
-getTLS :: TransportPeer -> TransportConfig -> T.Context -> IO TLS
-getTLS tlsPeer cfg cxt = withTlsUnique tlsPeer cxt newTLS
+getTLS :: TransportPeer -> TransportConfig -> X.CertificateChain -> T.Context -> IO TLS
+getTLS tlsPeer cfg tlsServerCerts cxt = withTlsUnique tlsPeer cxt newTLS
   where
     newTLS tlsUniq = do
       tlsBuffer <- atomically newTBuffer
-      pure TLS {tlsContext = cxt, tlsTransportConfig = cfg, tlsPeer, tlsUniq, tlsBuffer}
+      pure TLS {tlsContext = cxt, tlsTransportConfig = cfg, tlsServerCerts, tlsPeer, tlsUniq, tlsBuffer}
 
 withTlsUnique :: TransportPeer -> T.Context -> (ByteString -> IO c) -> IO c
 withTlsUnique peer cxt f =
@@ -207,6 +281,7 @@ instance Transport TLS where
   transportConfig = tlsTransportConfig
   getServerConnection = getTLS TServer
   getClientConnection = getTLS TClient
+  getServerCerts = tlsServerCerts
   tlsUnique = tlsUniq
   closeConnection tls = closeTLS $ tlsContext tls
 
@@ -217,8 +292,8 @@ instance Transport TLS where
     getBuffered tlsBuffer n t_ (T.recvData tlsContext)
 
   cPut :: TLS -> ByteString -> IO ()
-  cPut TLS {tlsContext, tlsTransportConfig = TransportConfig {transportTimeout = t_}} s =
-    withTimedErr t_ . T.sendData tlsContext $ BL.fromStrict s
+  cPut TLS {tlsContext, tlsTransportConfig = TransportConfig {transportTimeout = t_}} =
+    withTimedErr t_ . T.sendData tlsContext . LB.fromStrict
 
   getLn :: TLS -> IO ByteString
   getLn TLS {tlsContext, tlsBuffer} = do
@@ -230,45 +305,87 @@ instance Transport TLS where
 
 -- * SMP transport
 
--- | The handle for SMP encrypted transport connection over Transport .
-data THandle c = THandle
+-- | The handle for SMP encrypted transport connection over Transport.
+data THandle v c = THandle
   { connection :: c,
-    sessionId :: SessionId,
+    params :: THandleParams v
+  }
+
+type THandleSMP c = THandle SMPVersion c
+
+data THandleParams v = THandleParams
+  { sessionId :: SessionId,
     blockSize :: Int,
     -- | agreed server protocol version
-    thVersion :: Version,
+    thVersion :: Version v,
+    -- | peer public key for command authorization and shared secrets for entity ID encryption
+    thAuth :: Maybe THandleAuth,
+    -- | do NOT send session ID in transmission, but include it into signed message
+    -- based on protocol version
+    implySessId :: Bool,
     -- | send multiple transmissions in a single block
-    -- based on protocol and protocol version
+    -- based on protocol version
     batch :: Bool
   }
 
+data THandleAuth = THandleAuth
+  { peerPubKey :: C.PublicKeyX25519, -- used only in the client to combine with per-queue key
+    privKey :: C.PrivateKeyX25519 -- used to combine with peer's per-queue key (currently only in the server)
+  }
+
 -- | TLS-unique channel binding
 type SessionId = ByteString
 
 data ServerHandshake = ServerHandshake
-  { smpVersionRange :: VersionRange,
-    sessionId :: SessionId
+  { smpVersionRange :: VersionRangeSMP,
+    sessionId :: SessionId,
+    -- pub key to agree shared secrets for command authorization and entity ID encryption.
+    authPubKey :: Maybe (X.CertificateChain, X.SignedExact X.PubKey)
   }
 
 data ClientHandshake = ClientHandshake
   { -- | agreed SMP server protocol version
-    smpVersion :: Version,
+    smpVersion :: VersionSMP,
     -- | server identity - CA certificate fingerprint
-    keyHash :: C.KeyHash
+    keyHash :: C.KeyHash,
+    -- pub key to agree shared secret for entity ID encryption, shared secret for command authorization is agreed using per-queue keys.
+    authPubKey :: Maybe C.PublicKeyX25519
   }
 
 instance Encoding ClientHandshake where
-  smpEncode ClientHandshake {smpVersion, keyHash} = smpEncode (smpVersion, keyHash)
+  smpEncode ClientHandshake {smpVersion, keyHash, authPubKey} =
+    smpEncode (smpVersion, keyHash) <> encodeAuthEncryptCmds smpVersion authPubKey
   smpP = do
     (smpVersion, keyHash) <- smpP
-    pure ClientHandshake {smpVersion, keyHash}
+    -- TODO drop SMP v6: remove special parser and make key non-optional
+    authPubKey <- authEncryptCmdsP smpVersion smpP
+    pure ClientHandshake {smpVersion, keyHash, authPubKey}
 
 instance Encoding ServerHandshake where
-  smpEncode ServerHandshake {smpVersionRange, sessionId} =
-    smpEncode (smpVersionRange, sessionId)
+  smpEncode ServerHandshake {smpVersionRange, sessionId, authPubKey} =
+    smpEncode (smpVersionRange, sessionId) <> auth
+    where
+      auth =
+        encodeAuthEncryptCmds (maxVersion smpVersionRange) $
+          bimap C.encodeCertChain C.SignedObject <$> authPubKey
   smpP = do
     (smpVersionRange, sessionId) <- smpP
-    pure ServerHandshake {smpVersionRange, sessionId}
+    -- TODO drop SMP v6: remove special parser and make key non-optional
+    authPubKey <- authEncryptCmdsP (maxVersion smpVersionRange) authP
+    pure ServerHandshake {smpVersionRange, sessionId, authPubKey}
+    where
+      authP = do
+        cert <- C.certChainP
+        C.SignedObject key <- smpP
+        pure (cert, key)
+
+encodeAuthEncryptCmds :: Encoding a => VersionSMP -> Maybe a -> ByteString
+encodeAuthEncryptCmds v k
+  | v >= authCmdsSMPVersion = maybe "" smpEncode k
+  | otherwise = ""
+
+authEncryptCmdsP :: VersionSMP -> Parser a -> Parser (Maybe a)
+authEncryptCmdsP v p = if v >= authCmdsSMPVersion then Just <$> p else pure Nothing
 
 -- | Error of SMP encrypted transport over TCP.
 data TransportError
@@ -278,6 +395,9 @@ data TransportError
     TELargeMsg
   | -- | incorrect session ID
     TEBadSession
+  | -- | absent server key for v7 entity
+    -- This error happens when the server did not provide a DH key to authorize commands for the queue that should be authorized with a DH key.
+    TENoServerAuth
   | -- | transport handshake error
     TEHandshake {handshakeErr :: HandshakeError}
   deriving (Eq, Read, Show, Exception)
@@ -290,6 +410,8 @@ data HandshakeError
     VERSION
   | -- | incorrect server identity
     IDENTITY
+  | -- | v7 authentication failed
+    BAD_AUTH
   deriving (Eq, Read, Show, Exception)
 
 -- | SMP encrypted transport error parser.
@@ -298,6 +420,7 @@ transportErrorP =
   "BLOCK" $> TEBadBlock
     <|> "LARGE_MSG" $> TELargeMsg
     <|> "SESSION" $> TEBadSession
+    <|> "NO_AUTH" $> TENoServerAuth
     <|> "HANDSHAKE " *> (TEHandshake <$> parseRead1)
 
 -- | Serialize SMP encrypted transport error.
@@ -306,17 +429,18 @@ serializeTransportError = \case
   TEBadBlock -> "BLOCK"
   TELargeMsg -> "LARGE_MSG"
   TEBadSession -> "SESSION"
+  TENoServerAuth -> "NO_AUTH"
   TEHandshake e -> "HANDSHAKE " <> bshow e
 
 -- | Pad and send block to SMP transport.
-tPutBlock :: Transport c => THandle c -> ByteString -> IO (Either TransportError ())
-tPutBlock THandle {connection = c, blockSize} block =
+tPutBlock :: Transport c => THandle v c -> ByteString -> IO (Either TransportError ())
+tPutBlock THandle {connection = c, params = THandleParams {blockSize}} block =
   bimapM (const $ pure TELargeMsg) (cPut c) $
     C.pad block blockSize
 
 -- | Receive block from SMP transport.
-tGetBlock :: Transport c => THandle c -> IO (Either TransportError ByteString)
-tGetBlock THandle {connection = c, blockSize} = do
+tGetBlock :: Transport c => THandle v c -> IO (Either TransportError ByteString)
+tGetBlock THandle {connection = c, params = THandleParams {blockSize}} = do
   msg <- cGet c blockSize
   if B.length msg == blockSize
     then pure . first (const TELargeMsg) $ C.unPad msg
@@ -325,44 +449,61 @@ tGetBlock THandle {connection = c, blockSize} = do
 -- | Server SMP transport handshake.
 --
 -- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#appendix-a
-smpServerHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
-smpServerHandshake c kh smpVRange = do
-  let th@THandle {sessionId} = smpTHandle c
-  sendHandshake th $ ServerHandshake {sessionId, smpVersionRange = smpVRange}
+smpServerHandshake :: forall c. Transport c => C.APrivateSignKey -> c -> C.KeyPairX25519 -> C.KeyHash -> VersionRangeSMP -> ExceptT TransportError IO (THandleSMP c)
+smpServerHandshake serverSignKey c (k, pk) kh smpVRange = do
+  let th@THandle {params = THandleParams {sessionId}} = smpTHandle c
+      sk = C.signX509 serverSignKey $ C.publicToX509 k
+      certChain = getServerCerts c
+  sendHandshake th $ ServerHandshake {sessionId, smpVersionRange = smpVRange, authPubKey = Just (certChain, sk)}
   getHandshake th >>= \case
-    ClientHandshake {smpVersion, keyHash}
+    ClientHandshake {smpVersion = v, keyHash, authPubKey = k'}
       | keyHash /= kh ->
           throwE $ TEHandshake IDENTITY
-      | smpVersion `isCompatible` smpVRange -> do
-          pure $ smpThHandle th smpVersion
+      | v `isCompatible` smpVRange ->
+          pure $ smpThHandle th v pk k'
       | otherwise -> throwE $ TEHandshake VERSION
 
 -- | Client SMP transport handshake.
 --
 -- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#appendix-a
-smpClientHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
-smpClientHandshake c keyHash smpVRange = do
-  let th@THandle {sessionId} = smpTHandle c
-  ServerHandshake {sessionId = sessId, smpVersionRange} <- getHandshake th
+smpClientHandshake :: forall c. Transport c => c -> C.KeyPairX25519 -> C.KeyHash -> VersionRangeSMP -> ExceptT TransportError IO (THandleSMP c)
+smpClientHandshake c (k, pk) keyHash@(C.KeyHash kh) smpVRange = do
+  let th@THandle {params = THandleParams {sessionId}} = smpTHandle c
+  ServerHandshake {sessionId = sessId, smpVersionRange, authPubKey} <- getHandshake th
   if sessionId /= sessId
     then throwE TEBadSession
     else case smpVersionRange `compatibleVersion` smpVRange of
-      Just (Compatible smpVersion) -> do
-        sendHandshake th $ ClientHandshake {smpVersion, keyHash}
-        pure $ smpThHandle th smpVersion
+      Just (Compatible v) -> do
+        sk_ <- forM authPubKey $ \(X.CertificateChain cert, exact) ->
+          liftEitherWith (const $ TEHandshake BAD_AUTH) $ do
+            case cert of
+              [_leaf, ca] | XV.Fingerprint kh == XV.getFingerprint ca X.HashSHA256 -> pure ()
+              _ -> throwError "bad certificate"
+            serverKey <- getServerVerifyKey c
+            pubKey <- C.verifyX509 serverKey exact
+            C.x509ToPublic (pubKey, []) >>= C.pubKey
+        sendHandshake th $ ClientHandshake {smpVersion = v, keyHash, authPubKey = Just k}
+        pure $ smpThHandle th v pk sk_
       Nothing -> throwE $ TEHandshake VERSION
 
-smpThHandle :: forall c. THandle c -> Version -> THandle c
-smpThHandle th v = (th :: THandle c) {thVersion = v, batch = v >= 4}
+smpThHandle :: forall c. THandleSMP c -> VersionSMP -> C.PrivateKeyX25519 -> Maybe C.PublicKeyX25519 -> THandleSMP c
+smpThHandle th@THandle {params} v privKey k_ =
+  -- TODO drop SMP v6: make thAuth non-optional
+  let thAuth = (\k -> THandleAuth {peerPubKey = k, privKey}) <$> k_
+      params' = params {thVersion = v, thAuth, implySessId = v >= authCmdsSMPVersion}
+   in (th :: THandleSMP c) {params = params'}
 
-sendHandshake :: (Transport c, Encoding smp) => THandle c -> smp -> ExceptT TransportError IO ()
+sendHandshake :: (Transport c, Encoding smp) => THandle v c -> smp -> ExceptT TransportError IO ()
 sendHandshake th = ExceptT . tPutBlock th . smpEncode
 
-getHandshake :: (Transport c, Encoding smp) => THandle c -> ExceptT TransportError IO smp
-getHandshake th = ExceptT $ (parse smpP (TEHandshake PARSE) =<<) <$> tGetBlock th
+-- ignores tail bytes to allow future extensions
+getHandshake :: (Transport c, Encoding smp) => THandle v c -> ExceptT TransportError IO smp
+getHandshake th = ExceptT $ (first (\_ -> TEHandshake PARSE) . A.parseOnly smpP =<<) <$> tGetBlock th
 
-smpTHandle :: Transport c => c -> THandle c
-smpTHandle c = THandle {connection = c, sessionId = tlsUnique c, blockSize = smpBlockSize, thVersion = 0, batch = False}
+smpTHandle :: Transport c => c -> THandleSMP c
+smpTHandle c = THandle {connection = c, params}
+  where
+    params = THandleParams {sessionId = tlsUnique c, blockSize = smpBlockSize, thVersion = VersionSMP 0, thAuth = Nothing, implySessId = False, batch = True}
 
 $(J.deriveJSON (sumTypeJSON id) ''HandshakeError)
 

src/Simplex/Messaging/Transport/Client.hs

@@ -21,6 +21,8 @@ module Simplex.Messaging.Transport.Client
 where
 
 import Control.Applicative (optional)
+import Control.Logger.Simple (logError)
+import Control.Monad (when)
 import Control.Monad.IO.Unlift
 import Data.Aeson (FromJSON (..), ToJSON (..))
 import qualified Data.Attoparsec.ByteString.Char8 as A
@@ -48,11 +50,12 @@ import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (parseAll, parseString)
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Transport.KeepAlive
-import Simplex.Messaging.Util (bshow, (<$?>))
+import Simplex.Messaging.Util (bshow, (<$?>), catchAll, tshow)
 import System.IO.Error
 import Text.Read (readMaybe)
 import UnliftIO.Exception (IOException)
 import qualified UnliftIO.Exception as E
+import UnliftIO.STM
 
 data TransportHost
   = THIPv4 (Word8, Word8, Word8, Word8)
@@ -128,16 +131,23 @@ runTransportClient = runTLSTransportClient supportedParameters Nothing
 
 runTLSTransportClient :: (Transport c, MonadUnliftIO m) => T.Supported -> Maybe XS.CertificateStore -> TransportClientConfig -> Maybe ByteString -> TransportHost -> ServiceName -> Maybe C.KeyHash -> (c -> m a) -> m a
 runTLSTransportClient tlsParams caStore_ cfg@TransportClientConfig {socksProxy, tcpKeepAlive, clientCredentials} proxyUsername host port keyHash client = do
+  serverCert <- newEmptyTMVarIO
   let hostName = B.unpack $ strEncode host
-      clientParams = mkTLSClientParams tlsParams caStore_ hostName port keyHash clientCredentials
+      clientParams = mkTLSClientParams tlsParams caStore_ hostName port keyHash clientCredentials serverCert
       connectTCP = case socksProxy of
         Just proxy -> connectSocksClient proxy proxyUsername $ hostAddr host
         _ -> connectTCPClient hostName
   c <- liftIO $ do
     sock <- connectTCP port
-    mapM_ (setSocketKeepAlive sock) tcpKeepAlive
+    mapM_ (setSocketKeepAlive sock) tcpKeepAlive `catchAll` \e -> logError ("Error setting TCP keep-alive" <> tshow e)
     let tCfg = clientTransportConfig cfg
-    connectTLS (Just hostName) tCfg clientParams sock >>= getClientConnection tCfg
+    connectTLS (Just hostName) tCfg clientParams sock >>= \tls -> do
+      chain <- atomically (tryTakeTMVar serverCert) >>= \case
+        Nothing -> do
+          logError "onServerCertificate didn't fire or failed to get cert chain"
+          closeTLS tls >> error "onServerCertificate failed"
+        Just c -> pure c
+      getClientConnection tCfg chain tls
   client c `E.finally` liftIO (closeConnection c)
   where
     hostAddr = \case
@@ -206,19 +216,24 @@ instance ToJSON SocksProxy where
 instance FromJSON SocksProxy where
   parseJSON = strParseJSON "SocksProxy"
 
-mkTLSClientParams :: T.Supported -> Maybe XS.CertificateStore -> HostName -> ServiceName -> Maybe C.KeyHash -> Maybe (X.CertificateChain, T.PrivKey) -> T.ClientParams
-mkTLSClientParams supported caStore_ host port cafp_ clientCreds_ =
+mkTLSClientParams :: T.Supported -> Maybe XS.CertificateStore -> HostName -> ServiceName -> Maybe C.KeyHash -> Maybe (X.CertificateChain, T.PrivKey) -> TMVar X.CertificateChain -> T.ClientParams
+mkTLSClientParams supported caStore_ host port cafp_ clientCreds_ serverCerts =
   (T.defaultParamsClient host p)
     { T.clientShared = def {T.sharedCAStore = fromMaybe (T.sharedCAStore def) caStore_},
       T.clientHooks =
         def
-          { T.onServerCertificate = maybe def (\cafp _ _ _ -> validateCertificateChain cafp host p) cafp_,
+          { T.onServerCertificate = onServerCert,
             T.onCertificateRequest = maybe def (const . pure . Just) clientCreds_
           },
       T.clientSupported = supported
     }
   where
     p = B.pack port
+    onServerCert _ _ _ c = do
+      errs <- maybe def (\ca -> validateCertificateChain ca host p c) cafp_
+      when (null errs) $
+        atomically (putTMVar serverCerts c)
+      pure errs
 
 validateCertificateChain :: C.KeyHash -> HostName -> ByteString -> X.CertificateChain -> IO [XV.FailedReason]
 validateCertificateChain _ _ _ (X.CertificateChain []) = pure [XV.EmptyChain]

src/Simplex/Messaging/Transport/Credentials.hs

@@ -9,6 +9,8 @@ module Simplex.Messaging.Transport.Credentials
   )
 where
 
+import Control.Concurrent.STM
+import Crypto.Random (ChaChaDRG)
 import Data.ASN1.Types (getObjectID)
 import Data.ASN1.Types.String (ASN1StringEncoding (UTF8))
 import Data.Hourglass (Hours (..), timeAdd)
@@ -45,9 +47,9 @@ privateToTls (C.APrivateSignKey _ k) = case k of
 
 type Credentials = (C.ASignatureKeyPair, X509.SignedCertificate)
 
-genCredentials :: Maybe Credentials -> (Hours, Hours) -> Text -> IO Credentials
-genCredentials parent (before, after) subjectName = do
-  subjectKeys <- C.generateSignatureKeyPair C.SEd25519
+genCredentials :: TVar ChaChaDRG -> Maybe Credentials -> (Hours, Hours) -> Text -> IO Credentials
+genCredentials g parent (before, after) subjectName = do
+  subjectKeys <- atomically $ C.generateSignatureKeyPair C.SEd25519 g
   let (issuerKeys, issuer) = case parent of
         Nothing -> (subjectKeys, subject) -- self-signed
         Just (keys, cert) -> (keys, X509.certSubjectDN . X509.signedObject $ X509.getSigned cert)

src/Simplex/Messaging/Transport/HTTP2/Server.hs

@@ -5,15 +5,20 @@ module Simplex.Messaging.Transport.HTTP2.Server where
 import Control.Concurrent.Async (Async, async, uninterruptibleCancel)
 import Control.Concurrent.STM
 import Control.Monad
+import Data.Time.Clock.System (getSystemTime, systemSeconds)
 import Network.HPACK (BufferSize)
 import Network.HTTP2.Server (Request, Response)
 import qualified Network.HTTP2.Server as H
 import Network.Socket
 import qualified Network.TLS as T
 import Numeric.Natural (Natural)
-import Simplex.Messaging.Transport (SessionId, TLS)
+import Simplex.Messaging.Server.Expiration
+import Simplex.Messaging.Transport (SessionId, TLS, closeConnection)
 import Simplex.Messaging.Transport.HTTP2
 import Simplex.Messaging.Transport.Server (TransportServerConfig (..), loadSupportedTLSServerParams, runTransportServer)
+import Simplex.Messaging.Util (threadDelay')
+import UnliftIO (finally)
+import UnliftIO.Concurrent (forkIO, killThread)
 
 type HTTP2ServerFunc = SessionId -> Request -> (Response -> IO ()) -> IO ()
 
@@ -49,7 +54,7 @@ getHTTP2Server HTTP2ServerConfig {qSize, http2Port, bufferSize, bodyHeadSize, se
   started <- newEmptyTMVarIO
   reqQ <- newTBQueueIO qSize
   action <- async $
-    runHTTP2Server started http2Port bufferSize tlsServerParams transportConfig $ \sessionId r sendResponse -> do
+    runHTTP2Server started http2Port bufferSize tlsServerParams transportConfig Nothing $ \sessionId r sendResponse -> do
       reqBody <- getHTTP2Body r bodyHeadSize
       atomically $ writeTBQueue reqQ HTTP2Request {sessionId, request = r, reqBody, sendResponse}
   void . atomically $ takeTMVar started
@@ -58,12 +63,29 @@ getHTTP2Server HTTP2ServerConfig {qSize, http2Port, bufferSize, bodyHeadSize, se
 closeHTTP2Server :: HTTP2Server -> IO ()
 closeHTTP2Server = uninterruptibleCancel . action
 
-runHTTP2Server :: TMVar Bool -> ServiceName -> BufferSize -> T.ServerParams -> TransportServerConfig -> HTTP2ServerFunc -> IO ()
-runHTTP2Server started port bufferSize serverParams transportConfig = runHTTP2ServerWith bufferSize setup
+runHTTP2Server :: TMVar Bool -> ServiceName -> BufferSize -> T.ServerParams -> TransportServerConfig -> Maybe ExpirationConfig -> HTTP2ServerFunc -> IO ()
+runHTTP2Server started port bufferSize serverParams transportConfig expCfg_ = runHTTP2ServerWith_ expCfg_ bufferSize setup
   where
     setup = runTransportServer started port serverParams transportConfig
 
-runHTTP2ServerWith :: BufferSize -> ((TLS -> IO ()) -> a) -> (SessionId -> Request -> (Response -> IO ()) -> IO ()) -> a
-runHTTP2ServerWith bufferSize setup http2Server = setup $ withHTTP2 bufferSize run
+runHTTP2ServerWith :: BufferSize -> ((TLS -> IO ()) -> a) -> HTTP2ServerFunc -> a
+runHTTP2ServerWith = runHTTP2ServerWith_ Nothing
+
+runHTTP2ServerWith_ :: Maybe ExpirationConfig -> BufferSize -> ((TLS -> IO ()) -> a) -> HTTP2ServerFunc -> a
+runHTTP2ServerWith_ expCfg_ bufferSize setup http2Server = setup $ \tls -> do
+  activeAt <- newTVarIO =<< getSystemTime
+  tid_ <- mapM (forkIO . expireInactiveClient tls activeAt) expCfg_
+  withHTTP2 bufferSize (run activeAt) tls `finally` mapM_ killThread tid_
   where
-    run cfg sessId = H.run cfg $ \req _aux sendResp -> http2Server sessId req (`sendResp` [])
+    run activeAt cfg sessId = H.run cfg $ \req _aux sendResp -> do
+      getSystemTime >>= atomically . writeTVar activeAt
+      http2Server sessId req (`sendResp` [])
+    expireInactiveClient tls activeAt expCfg = loop
+      where
+        loop = do
+          threadDelay' $ checkInterval expCfg * 1000000
+          old <- expireBeforeEpoch expCfg
+          ts <- readTVarIO activeAt
+          if systemSeconds ts < old
+            then closeConnection tls
+            else loop

src/Simplex/Messaging/Transport/Server.hs

@@ -7,6 +7,9 @@
 module Simplex.Messaging.Transport.Server
   ( TransportServerConfig (..),
     defaultTransportServerConfig,
+    runTransportServerState,
+    SocketState,
+    newSocketState,
     runTransportServer,
     runTransportServerSocket,
     runTCPServer,
@@ -16,6 +19,7 @@ module Simplex.Messaging.Transport.Server
     loadTLSServerParams,
     loadFingerprint,
     smpServerHandshake,
+    tlsServerCredentials
   )
 where
 
@@ -26,24 +30,26 @@ import Control.Monad.IO.Unlift
 import qualified Crypto.Store.X509 as SX
 import Data.Default (def)
 import Data.List (find)
+import Data.IntMap.Strict (IntMap)
+import qualified Data.IntMap.Strict as IM
 import Data.Maybe (fromJust)
 import qualified Data.X509 as X
 import Data.X509.Validation (Fingerprint (..))
 import qualified Data.X509.Validation as XV
 import Network.Socket
 import qualified Network.TLS as T
-import Simplex.Messaging.TMap (TMap)
-import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Util (catchAll_, labelMyThread, tshow)
 import System.Exit (exitFailure)
 import System.Mem.Weak (Weak, deRefWeak)
+import UnliftIO (timeout)
 import UnliftIO.Concurrent
 import qualified UnliftIO.Exception as E
 import UnliftIO.STM
 
 data TransportServerConfig = TransportServerConfig
   { logTLSErrors :: Bool,
+    tlsSetupTimeout :: Int,
     transportTimeout :: Int
   }
   deriving (Eq, Show)
@@ -52,6 +58,7 @@ defaultTransportServerConfig :: TransportServerConfig
 defaultTransportServerConfig =
   TransportServerConfig
     { logTLSErrors = True,
+      tlsSetupTimeout = 60000000,
       transportTimeout = 40000000
     }
 
@@ -64,40 +71,63 @@ serverTransportConfig TransportServerConfig {logTLSErrors} =
 --
 -- All accepted connections are passed to the passed function.
 runTransportServer :: forall c m. (Transport c, MonadUnliftIO m) => TMVar Bool -> ServiceName -> T.ServerParams -> TransportServerConfig -> (c -> m ()) -> m ()
-runTransportServer started port = runTransportServerSocket started (startTCPServer started port) (transportName (TProxy :: TProxy c))
+runTransportServer started port params cfg server = do
+  ss <- atomically newSocketState
+  runTransportServerState ss started port params cfg server
+
+runTransportServerState :: forall c m. (Transport c, MonadUnliftIO m) => SocketState -> TMVar Bool -> ServiceName -> T.ServerParams -> TransportServerConfig -> (c -> m ()) -> m ()
+runTransportServerState ss started port = runTransportServerSocketState ss started (startTCPServer started port) (transportName (TProxy :: TProxy c))
 
 -- | Run a transport server with provided connection setup and handler.
-runTransportServerSocket :: (MonadUnliftIO m, T.TLSParams p, Transport a) => TMVar Bool -> IO Socket -> String -> p -> TransportServerConfig -> (a -> m ()) -> m ()
+runTransportServerSocket :: (MonadUnliftIO m, Transport a) => TMVar Bool -> IO Socket -> String -> T.ServerParams -> TransportServerConfig -> (a -> m ()) -> m ()
 runTransportServerSocket started getSocket threadLabel serverParams cfg server = do
+  ss <- atomically newSocketState
+  runTransportServerSocketState ss started getSocket threadLabel serverParams cfg server
+
+-- | Run a transport server with provided connection setup and handler.
+runTransportServerSocketState :: (MonadUnliftIO m, Transport a) => SocketState -> TMVar Bool -> IO Socket -> String -> T.ServerParams -> TransportServerConfig -> (a -> m ()) -> m ()
+runTransportServerSocketState ss started getSocket threadLabel serverParams cfg server = do
   u <- askUnliftIO
-  let tCfg = serverTransportConfig cfg
   labelMyThread $ "transport server for " <> threadLabel
-  liftIO . runTCPServerSocket started getSocket $ \conn ->
-    E.bracket
-      (connectTLS Nothing tCfg serverParams conn >>= getServerConnection tCfg)
-      closeConnection
-      (unliftIO u . server)
+  liftIO . runTCPServerSocket ss started getSocket $ \conn ->
+    E.bracket (setup conn >>= maybe (fail "tls setup timeout") pure) closeConnection (unliftIO u . server)
+  where
+    tCfg = serverTransportConfig cfg
+    setup conn = timeout (tlsSetupTimeout cfg) $ do
+      labelMyThread $ threadLabel <> "/setup"
+      tls <- connectTLS Nothing tCfg serverParams conn
+      getServerConnection tCfg (fst $ tlsServerCredentials serverParams) tls
+
+tlsServerCredentials :: T.ServerParams -> (X.CertificateChain, X.PrivKey)
+tlsServerCredentials serverParams = case T.sharedCredentials $ T.serverShared serverParams of
+  T.Credentials [creds] -> creds
+  _ -> error "server has more than one key"
 
 -- | Run TCP server without TLS
 runTCPServer :: TMVar Bool -> ServiceName -> (Socket -> IO ()) -> IO ()
-runTCPServer started port = runTCPServerSocket started $ startTCPServer started port
+runTCPServer started port server = do
+  ss <- atomically newSocketState
+  runTCPServerSocket ss started (startTCPServer started port) server
 
 -- | Wrap socket provider in a TCP server bracket.
-runTCPServerSocket :: TMVar Bool -> IO Socket -> (Socket -> IO ()) -> IO ()
-runTCPServerSocket started getSocket server = do
-  clients <- atomically TM.empty
-  clientId <- newTVarIO 0
-  E.bracket
-    getSocket
-    (closeServer started clients)
-    $ \sock -> forever . E.bracketOnError (accept sock) (close . fst) $ \(conn, _peer) -> do
-      -- catchAll_ is needed here in case the connection was closed earlier
-      cId <- atomically $ stateTVar clientId $ \cId -> let cId' = cId + 1 in (cId', cId')
-      let closeConn _ = atomically (TM.delete cId clients) >> gracefulClose conn 5000 `catchAll_` pure ()
+runTCPServerSocket :: SocketState -> TMVar Bool -> IO Socket -> (Socket -> IO ()) -> IO ()
+runTCPServerSocket (accepted, gracefullyClosed, clients) started getSocket server =
+  E.bracket getSocket (closeServer started clients) $ \sock ->
+    forever . E.bracketOnError (accept sock) (close . fst) $ \(conn, _peer) -> do
+      cId <- atomically $ stateTVar accepted $ \cId -> let cId' = cId + 1 in cId `seq` (cId', cId')
+      let closeConn _ = do
+            atomically $ modifyTVar' clients $ IM.delete cId 
+            gracefulClose conn 5000 `catchAll_` pure () -- catchAll_ is needed here in case the connection was closed earlier
+            atomically $ modifyTVar' gracefullyClosed (+1)
       tId <- mkWeakThreadId =<< server conn `forkFinally` closeConn
-      atomically $ TM.insert cId tId clients
+      atomically $ modifyTVar' clients $ IM.insert cId tId
 
-closeServer :: TMVar Bool -> TMap Int (Weak ThreadId) -> Socket -> IO ()
+type SocketState = (TVar Int, TVar Int, TVar (IntMap (Weak ThreadId)))
+
+newSocketState :: STM SocketState
+newSocketState = (,,) <$> newTVar 0 <*> newTVar 0 <*> newTVar mempty
+
+closeServer :: TMVar Bool -> TVar (IntMap (Weak ThreadId)) -> Socket -> IO ()
 closeServer started clients sock = do
   readTVarIO clients >>= mapM_ (deRefWeak >=> mapM_ killThread)
   close sock

src/Simplex/Messaging/Transport/WebSockets.hs

@@ -7,7 +7,8 @@ module Simplex.Messaging.Transport.WebSockets (WS (..)) where
 import qualified Control.Exception as E
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
-import qualified Data.ByteString.Lazy as BL
+import qualified Data.ByteString.Lazy as LB
+import qualified Data.X509 as X
 import qualified Network.TLS as T
 import Network.WebSockets
 import Network.WebSockets.Stream (Stream)
@@ -29,7 +30,8 @@ data WS = WS
     tlsUniq :: ByteString,
     wsStream :: Stream,
     wsConnection :: Connection,
-    wsTransportConfig :: TransportConfig
+    wsTransportConfig :: TransportConfig,
+    wsServerCerts :: X.CertificateChain
   }
 
 websocketsOpts :: ConnectionOptions
@@ -50,12 +52,15 @@ instance Transport WS where
   transportConfig :: WS -> TransportConfig
   transportConfig = wsTransportConfig
 
-  getServerConnection :: TransportConfig -> T.Context -> IO WS
+  getServerConnection :: TransportConfig -> X.CertificateChain -> T.Context -> IO WS
   getServerConnection = getWS TServer
 
-  getClientConnection :: TransportConfig -> T.Context -> IO WS
+  getClientConnection :: TransportConfig -> X.CertificateChain -> T.Context -> IO WS
   getClientConnection = getWS TClient
 
+  getServerCerts :: WS -> X.CertificateChain
+  getServerCerts = wsServerCerts
+
   tlsUnique :: WS -> ByteString
   tlsUnique = tlsUniq
 
@@ -79,13 +84,13 @@ instance Transport WS where
       then E.throwIO TEBadBlock
       else pure $ B.init s
 
-getWS :: TransportPeer -> TransportConfig -> T.Context -> IO WS
-getWS wsPeer cfg cxt = withTlsUnique wsPeer cxt connectWS
+getWS :: TransportPeer -> TransportConfig -> X.CertificateChain -> T.Context -> IO WS
+getWS wsPeer cfg wsServerCerts cxt = withTlsUnique wsPeer cxt connectWS
   where
     connectWS tlsUniq = do
       s <- makeTLSContextStream cxt
       wsConnection <- connectPeer wsPeer s
-      pure $ WS {wsPeer, tlsUniq, wsStream = s, wsConnection, wsTransportConfig = cfg}
+      pure $ WS {wsPeer, tlsUniq, wsStream = s, wsConnection, wsTransportConfig = cfg, wsServerCerts}
     connectPeer :: TransportPeer -> Stream -> IO Connection
     connectPeer TServer = acceptClientRequest
     connectPeer TClient = sendClientRequest
@@ -101,5 +106,5 @@ makeTLSContextStream cxt =
       (Just <$> T.recvData cxt) `E.catch` \case
         T.Error_EOF -> pure Nothing
         e -> E.throwIO e
-    writeStream :: Maybe BL.ByteString -> IO ()
+    writeStream :: Maybe LB.ByteString -> IO ()
     writeStream = maybe (closeTLS cxt) (T.sendData cxt)

src/Simplex/Messaging/Util.hs

@@ -85,6 +85,18 @@ unlessM b = ifM b $ pure ()
 ($>>=) :: (Monad m, Monad f, Traversable f) => m (f a) -> (a -> m (f b)) -> m (f b)
 f $>>= g = f >>= fmap join . mapM g
 
+mapME :: (Monad m, Traversable t) => (a -> m (Either e b)) -> t (Either e a) -> m (t (Either e b))
+mapME f = mapM (bindRight f)
+{-# INLINE mapME #-}
+
+bindRight :: Monad m => (a -> m (Either e b)) -> Either e a -> m (Either e b)
+bindRight = either (pure . Left)
+{-# INLINE bindRight #-}
+
+forME :: (Monad m, Traversable t) => t (Either e a) -> (a -> m (Either e b)) -> m (t (Either e b))
+forME = flip mapME
+{-# INLINE forME #-}
+
 catchAll :: IO a -> (E.SomeException -> IO a) -> IO a
 catchAll = E.catch
 {-# INLINE catchAll #-}

src/Simplex/Messaging/Version.hs

@@ -1,13 +1,16 @@
 {-# LANGUAGE ConstrainedClassMethods #-}
 {-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE FunctionalDependencies #-}
+{-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE TypeFamilies #-}
-{-# LANGUAGE TypeSynonymInstances #-}
 
 module Simplex.Messaging.Version
   ( Version,
     VersionRange (minVersion, maxVersion),
+    VersionScope,
     pattern VersionRange,
     VersionI (..),
     VersionRangeI (..),
@@ -24,47 +27,61 @@ module Simplex.Messaging.Version
 where
 
 import Control.Applicative (optional)
-import Data.Aeson (FromJSON (..), ToJSON (..))
+import qualified Data.Aeson as J
+import qualified Data.Aeson.Encoding as JE
+import Data.Aeson.Types ((.:), (.=))
+import qualified Data.Aeson.Types as JT
 import qualified Data.Attoparsec.ByteString.Char8 as A
-import Data.Word (Word16)
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Util ((<$?>))
+import Simplex.Messaging.Version.Internal (Version (..))
 
-pattern VersionRange :: Word16 -> Word16 -> VersionRange
+pattern VersionRange :: Version v -> Version v -> VersionRange v
 pattern VersionRange v1 v2 <- VRange v1 v2
 
 {-# COMPLETE VersionRange #-}
 
-type Version = Word16
-
-data VersionRange = VRange
-  { minVersion :: Version,
-    maxVersion :: Version
+data VersionRange v = VRange
+  { minVersion :: Version v,
+    maxVersion :: Version v
   }
   deriving (Eq, Show)
 
+instance J.FromJSON (VersionRange v) where
+  parseJSON (J.Object v) = do
+    minVersion <- v .: "minVersion"
+    maxVersion <- v .: "maxVersion"
+    pure VRange {minVersion, maxVersion}
+  parseJSON invalid =
+    JT.prependFailure "bad VersionRange, " (JT.typeMismatch "Object" invalid)
+
+instance J.ToJSON (VersionRange v) where
+  toEncoding VRange {minVersion, maxVersion} = JE.pairs $ ("minVersion" .= minVersion) <> ("maxVersion" .= maxVersion)
+  toJSON VRange {minVersion, maxVersion} = J.object ["minVersion" .= minVersion, "maxVersion" .= maxVersion]
+
+class VersionScope v
+
 -- | construct valid version range, to be used in constants
-mkVersionRange :: Version -> Version -> VersionRange
+mkVersionRange :: Version v -> Version v -> VersionRange v
 mkVersionRange v1 v2
   | v1 <= v2 = VRange v1 v2
   | otherwise = error "invalid version range"
 
-safeVersionRange :: Version -> Version -> Maybe VersionRange
+safeVersionRange :: Version v -> Version v -> Maybe (VersionRange v)
 safeVersionRange v1 v2
   | v1 <= v2 = Just $ VRange v1 v2
   | otherwise = Nothing
 
-versionToRange :: Version -> VersionRange
+versionToRange :: Version v -> VersionRange v
 versionToRange v = VRange v v
 
-instance Encoding VersionRange where
+instance VersionScope v => Encoding (VersionRange v) where
   smpEncode (VRange v1 v2) = smpEncode (v1, v2)
   smpP =
     maybe (fail "invalid version range") pure
       =<< safeVersionRange <$> smpP <*> smpP
 
-instance StrEncoding VersionRange where
+instance VersionScope v => StrEncoding (VersionRange v) where
   strEncode (VRange v1 v2)
     | v1 == v2 = strEncode v1
     | otherwise = strEncode v1 <> "-" <> strEncode v2
@@ -73,32 +90,23 @@ instance StrEncoding VersionRange where
     v2 <- maybe (pure v1) (const strP) =<< optional (A.char '-')
     maybe (fail "invalid version range") pure $ safeVersionRange v1 v2
 
-instance ToJSON VersionRange where
-  toJSON (VRange v1 v2) = toJSON (v1, v2)
-  toEncoding (VRange v1 v2) = toEncoding (v1, v2)
+class VersionScope v => VersionI v a | a -> v where
+  type VersionRangeT v a
+  version :: a -> Version v
+  toVersionRangeT :: a -> VersionRange v -> VersionRangeT v a
 
-instance FromJSON VersionRange where
-  parseJSON v =
-    (\(v1, v2) -> maybe (Left "bad VersionRange") Right $ safeVersionRange v1 v2)
-      <$?> parseJSON v
+class VersionScope v => VersionRangeI v a | a -> v where
+  type VersionT v a
+  versionRange :: a -> VersionRange v
+  toVersionT :: a -> Version v -> VersionT v a
 
-class VersionI a where
-  type VersionRangeT a
-  version :: a -> Version
-  toVersionRangeT :: a -> VersionRange -> VersionRangeT a
-
-class VersionRangeI a where
-  type VersionT a
-  versionRange :: a -> VersionRange
-  toVersionT :: a -> Version -> VersionT a
-
-instance VersionI Version where
-  type VersionRangeT Version = VersionRange
+instance VersionScope v => VersionI v (Version v) where
+  type VersionRangeT v (Version v) = VersionRange v
   version = id
   toVersionRangeT _ vr = vr
 
-instance VersionRangeI VersionRange where
-  type VersionT VersionRange = Version
+instance VersionScope v => VersionRangeI v (VersionRange v) where
+  type VersionT v (VersionRange v) = Version v
   versionRange = id
   toVersionT _ v = v
 
@@ -109,18 +117,18 @@ pattern Compatible a <- Compatible_ a
 
 {-# COMPLETE Compatible #-}
 
-isCompatible :: VersionI a => a -> VersionRange -> Bool
+isCompatible :: VersionI v a => a -> VersionRange v -> Bool
 isCompatible x (VRange v1 v2) = let v = version x in v1 <= v && v <= v2
 
-isCompatibleRange :: VersionRangeI a => a -> VersionRange -> Bool
+isCompatibleRange :: VersionRangeI v a => a -> VersionRange v -> Bool
 isCompatibleRange x (VRange min2 max2) = min1 <= max2 && min2 <= max1
   where
     VRange min1 max1 = versionRange x
 
-proveCompatible :: VersionI a => a -> VersionRange -> Maybe (Compatible a)
+proveCompatible :: VersionI v a => a -> VersionRange v -> Maybe (Compatible a)
 proveCompatible x vr = x `mkCompatibleIf` (x `isCompatible` vr)
 
-compatibleVersion :: VersionRangeI a => a -> VersionRange -> Maybe (Compatible (VersionT a))
+compatibleVersion :: VersionRangeI v a => a -> VersionRange v -> Maybe (Compatible (VersionT v a))
 compatibleVersion x vr =
   toVersionT x (min max1 max2) `mkCompatibleIf` isCompatibleRange x vr
   where

src/Simplex/Messaging/Version/Internal.hs

@@ -0,0 +1,25 @@
+module Simplex.Messaging.Version.Internal where
+
+import Data.Aeson (FromJSON (..), ToJSON (..))
+import Data.Word (Word16)
+import Simplex.Messaging.Encoding
+import Simplex.Messaging.Encoding.String
+
+-- Do not use constructor of this type directry
+newtype Version v = Version Word16
+  deriving (Eq, Ord, Show)
+
+instance Encoding (Version v) where
+  smpEncode (Version v) = smpEncode v
+  smpP = Version <$> smpP
+
+instance StrEncoding (Version v) where
+  strEncode (Version v) = strEncode v
+  strP = Version <$> strP
+
+instance ToJSON (Version v) where
+  toEncoding (Version v) = toEncoding v
+  toJSON (Version v) = toJSON v
+
+instance FromJSON (Version v) where
+  parseJSON v = Version <$> parseJSON v

src/Simplex/RemoteControl/Client.hs

@@ -68,12 +68,6 @@ import Simplex.RemoteControl.Types
 import UnliftIO
 import UnliftIO.Concurrent
 
-currentRCVersion :: Version
-currentRCVersion = 1
-
-supportedRCVRange :: VersionRange
-supportedRCVRange = mkVersionRange 1 currentRCVersion
-
 xrcpBlockSize :: Int
 xrcpBlockSize = 16384
 
@@ -83,10 +77,10 @@ helloBlockSize = 12288
 encInvitationSize :: Int
 encInvitationSize = 900
 
-newRCHostPairing :: IO RCHostPairing
-newRCHostPairing = do
-  ((_, caKey), caCert) <- genCredentials Nothing (-25, 24 * 999999) "ca"
-  (_, idPrivKey) <- C.generateKeyPair'
+newRCHostPairing :: TVar ChaChaDRG -> IO RCHostPairing
+newRCHostPairing drg = do
+  ((_, caKey), caCert) <- genCredentials drg Nothing (-25, 24 * 999999) "ca"
+  (_, idPrivKey) <- atomically $ C.generateKeyPair drg
   pure RCHostPairing {caKey, caCert, idPrivKey, knownHost = Nothing}
 
 data RCHostClient = RCHostClient
@@ -108,7 +102,7 @@ connectRCHost drg pairing@RCHostPairing {caKey, caCert, idPrivKey, knownHost} ct
   r <- newEmptyTMVarIO
   found@(RCCtrlAddress {address} :| _) <- findCtrlAddress
   c@RCHClient_ {startedPort, announcer} <- liftIO mkClient
-  hostKeys <- liftIO genHostKeys
+  hostKeys <- atomically genHostKeys
   action <- runClient c r hostKeys `putRCError` r
   -- wait for the port to make invitation
   portNum <- atomically $ readTMVar startedPort
@@ -133,7 +127,7 @@ connectRCHost drg pairing@RCHostPairing {caKey, caCert, idPrivKey, knownHost} ct
       pure RCHClient_ {startedPort, announcer, hostCAHash, endSession}
     runClient :: RCHClient_ -> RCStepTMVar (SessionCode, TLS, RCStepTMVar (RCHostSession, RCHostHello, RCHostPairing)) -> RCHostKeys -> ExceptT RCErrorType IO (Async ())
     runClient RCHClient_ {startedPort, announcer, hostCAHash, endSession} r hostKeys = do
-      tlsCreds <- liftIO $ genTLSCredentials caKey caCert
+      tlsCreds <- liftIO $ genTLSCredentials drg caKey caCert
       startTLSServer port_ startedPort tlsCreds (tlsHooks r knownHost hostCAHash) $ \tls ->
         void . runExceptT $ do
           r' <- newEmptyTMVarIO
@@ -168,10 +162,10 @@ connectRCHost drg pairing@RCHostPairing {caKey, caCert, idPrivKey, knownHost} ct
               _ ->
                 pure $ TLS.CertificateUsageReject TLS.CertificateRejectUnknownCA
         }
-    genHostKeys :: IO RCHostKeys
+    genHostKeys :: STM RCHostKeys
     genHostKeys = do
-      sessKeys <- C.generateKeyPair'
-      dhKeys <- C.generateKeyPair'
+      sessKeys <- C.generateKeyPair drg
+      dhKeys <- C.generateKeyPair drg
       pure RCHostKeys {sessKeys, dhKeys}
     mkInvitation :: RCHostKeys -> TransportHost -> PortNumber -> IO RCSignedInvitation
     mkInvitation RCHostKeys {sessKeys, dhKeys} host portNum = do
@@ -181,7 +175,7 @@ connectRCHost drg pairing@RCHostPairing {caKey, caCert, idPrivKey, knownHost} ct
               { ca = certFingerprint caCert,
                 host,
                 port = fromIntegral portNum,
-                v = supportedRCVRange,
+                v = supportedRCPVRange,
                 app = ctrlAppInfo,
                 ts,
                 skey = fst sessKeys,
@@ -190,10 +184,10 @@ connectRCHost drg pairing@RCHostPairing {caKey, caCert, idPrivKey, knownHost} ct
               }
       pure $ signInvitation (snd sessKeys) idPrivKey inv
 
-genTLSCredentials :: C.APrivateSignKey -> C.SignedCertificate -> IO TLS.Credentials
-genTLSCredentials caKey caCert = do
+genTLSCredentials :: TVar ChaChaDRG -> C.APrivateSignKey -> C.SignedCertificate -> IO TLS.Credentials
+genTLSCredentials drg caKey caCert = do
   let caCreds = (C.signatureKeyPair caKey, caCert)
-  leaf <- genCredentials (Just caCreds) (0, 24 * 999999) "localhost" -- session-signing cert
+  leaf <- genCredentials drg (Just caCreds) (0, 24 * 999999) "localhost" -- session-signing cert
   pure . snd $ tlsCredentials (leaf :| [caCreds])
 
 certFingerprint :: X509.SignedCertificate -> C.KeyHash
@@ -220,12 +214,12 @@ prepareHostSession
     unless (ca == tlsHostFingerprint) $ throwError RCEIdentity
     (kemCiphertext, kemSharedKey) <- liftIO $ sntrup761Enc drg kemPubKey
     let hybridKey = kemHybridSecret dhPubKey dhPrivKey kemSharedKey
-    unless (isCompatible v supportedRCVRange) $ throwError RCEVersion
+    unless (isCompatible v supportedRCPVRange) $ throwError RCEVersion
     let keys = HostSessKeys {hybridKey, idPrivKey, sessPrivKey}
     knownHost' <- updateKnownHost ca dhPubKey
     let ctrlHello = RCCtrlHello {}
     -- TODO send error response if something fails
-    nonce' <- liftIO . atomically $ C.pseudoRandomCbNonce drg
+    nonce' <- liftIO . atomically $ C.randomCbNonce drg
     encBody' <- liftEitherWith (const RCEBlockSize) $ kcbEncrypt hybridKey nonce' (LB.toStrict $ J.encode ctrlHello) helloBlockSize
     let ctrlEncHello = RCCtrlEncHello {kem = kemCiphertext, nonce = nonce', encBody = encBody'}
     pure (ctrlEncHello, keys, hostHello, pairing {knownHost = Just knownHost'})
@@ -258,13 +252,13 @@ connectRCCtrl drg (RCVerifiedInvitation inv@RCInvitation {ca, idkey}) pairing_ h
   where
     newCtrlPairing :: IO RCCtrlPairing
     newCtrlPairing = do
-      ((_, caKey), caCert) <- genCredentials Nothing (0, 24 * 999999) "ca"
-      (_, dhPrivKey) <- C.generateKeyPair'
+      ((_, caKey), caCert) <- genCredentials drg Nothing (0, 24 * 999999) "ca"
+      (_, dhPrivKey) <- atomically $ C.generateKeyPair drg
       pure RCCtrlPairing {caKey, caCert, ctrlFingerprint = ca, idPubKey = idkey, dhPrivKey, prevDhPrivKey = Nothing}
     updateCtrlPairing :: RCCtrlPairing -> ExceptT RCErrorType IO RCCtrlPairing
     updateCtrlPairing pairing@RCCtrlPairing {ctrlFingerprint, idPubKey, dhPrivKey = currDhPrivKey} = do
       unless (ca == ctrlFingerprint && idPubKey == idkey) $ throwError RCEIdentity
-      (_, dhPrivKey) <- liftIO C.generateKeyPair'
+      (_, dhPrivKey) <- atomically $ C.generateKeyPair drg
       pure pairing {dhPrivKey, prevDhPrivKey = Just currDhPrivKey}
 
 connectRCCtrl_ :: TVar ChaChaDRG -> RCCtrlPairing -> RCInvitation -> J.Value -> ExceptT RCErrorType IO RCCtrlConnection
@@ -282,7 +276,7 @@ connectRCCtrl_ drg pairing'@RCCtrlPairing {caKey, caCert} inv@RCInvitation {ca,
     runClient :: RCCClient_ -> RCStepTMVar (SessionCode, TLS, RCStepTMVar (RCCtrlSession, RCCtrlPairing)) -> ExceptT RCErrorType IO ()
     runClient RCCClient_ {confirmSession, endSession} r = do
       clientCredentials <-
-        liftIO (genTLSCredentials caKey caCert) >>= \case
+        liftIO (genTLSCredentials drg caKey caCert) >>= \case
           TLS.Credentials (creds : _) -> pure $ Just creds
           _ -> throwError $ RCEInternal "genTLSCredentials must generate credentials"
       let clientConfig = defaultTransportClientConfig {clientCredentials}
@@ -334,10 +328,10 @@ prepareHostHello
   RCInvitation {v, dh = dhPubKey}
   hostAppInfo = do
     logDebug "Preparing session"
-    case compatibleVersion v supportedRCVRange of
+    case compatibleVersion v supportedRCPVRange of
       Nothing -> throwError RCEVersion
       Just (Compatible v') -> do
-        nonce <- liftIO . atomically $ C.pseudoRandomCbNonce drg
+        nonce <- liftIO . atomically $ C.randomCbNonce drg
         (kemPubKey, kemPrivKey) <- liftIO $ sntrup761Keypair drg
         let helloBody = RCHostHello {v = v', ca = certFingerprint caCert, app = hostAppInfo, kem = kemPubKey}
             sharedKey = C.dh' dhPubKey dhPrivKey
@@ -369,7 +363,7 @@ announceRC :: TVar ChaChaDRG -> Int -> C.PrivateKeyEd25519 -> C.PublicKeyX25519
 announceRC drg maxCount idPrivKey knownDhPub RCHostKeys {sessKeys, dhKeys} inv = withSender $ \sender -> do
   replicateM_ maxCount $ do
     logDebug "Announcing..."
-    nonce <- atomically $ C.pseudoRandomCbNonce drg
+    nonce <- atomically $ C.randomCbNonce drg
     encInvitation <- liftEitherWith undefined $ C.cbEncrypt sharedKey nonce sigInvitation encInvitationSize
     liftIO . UDP.send sender $ smpEncode RCEncInvitation {dhPubKey, nonce, encInvitation}
     threadDelay 1000000
@@ -434,7 +428,7 @@ cancelCtrlClient RCCtrlClient {action, client_ = RCCClient_ {endSession}} = do
 
 rcEncryptBody :: TVar ChaChaDRG -> KEMHybridSecret -> LazyByteString -> ExceptT RCErrorType IO (C.CbNonce, LazyByteString)
 rcEncryptBody drg hybridKey s = do
-  nonce <- atomically $ C.pseudoRandomCbNonce drg
+  nonce <- atomically $ C.randomCbNonce drg
   let len = LB.length s
   ct <- liftEitherWith (const RCEEncrypt) $ LC.kcbEncryptTailTag hybridKey nonce s len (len + 8)
   pure (nonce, ct)

src/Simplex/RemoteControl/Invitation.hs

@@ -27,7 +27,7 @@ import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (parseAll)
 import Simplex.Messaging.Transport.Client (TransportHost)
-import Simplex.Messaging.Version (VersionRange)
+import Simplex.RemoteControl.Types (VersionRangeRCP)
 
 data RCInvitation = RCInvitation
   { -- | CA TLS certificate fingerprint of the controller.
@@ -37,7 +37,7 @@ data RCInvitation = RCInvitation
     host :: TransportHost,
     port :: Word16,
     -- | Supported version range for remote control protocol
-    v :: VersionRange,
+    v :: VersionRangeRCP,
     -- | Application information
     app :: J.Value,
     -- | Session start time in seconds since epoch

src/Simplex/RemoteControl/Types.hs

@@ -5,6 +5,7 @@
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE TemplateHaskell #-}
 
@@ -17,6 +18,7 @@ import Data.ByteString (ByteString)
 import Data.Text (Text)
 import qualified Data.Text as T
 import Data.Text.Encoding (encodeUtf8)
+import Data.Word (Word16)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.SNTRUP761
 import Simplex.Messaging.Crypto.SNTRUP761.Bindings
@@ -26,7 +28,8 @@ import Simplex.Messaging.Parsers (defaultJSON, dropPrefix, sumTypeJSON)
 import Simplex.Messaging.Transport (TLS)
 import Simplex.Messaging.Transport.Client (TransportHost)
 import Simplex.Messaging.Util (safeDecodeUtf8)
-import Simplex.Messaging.Version (Version, VersionRange, mkVersionRange)
+import Simplex.Messaging.Version (VersionRange, VersionScope, mkVersionRange)
+import Simplex.Messaging.Version.Internal
 import UnliftIO
 
 data RCErrorType
@@ -92,24 +95,37 @@ instance StrEncoding RCErrorType where
 
 -- * Discovery
 
-ipProbeVersionRange :: VersionRange
-ipProbeVersionRange = mkVersionRange 1 1
+data RCPVersion
+
+instance VersionScope RCPVersion
+
+type VersionRCP = Version RCPVersion
+
+type VersionRangeRCP = VersionRange RCPVersion
+
+pattern VersionRCP :: Word16 -> VersionRCP
+pattern VersionRCP v = Version v
+
+currentRCPVersion :: VersionRCP
+currentRCPVersion = VersionRCP 1
+
+supportedRCPVRange :: VersionRangeRCP
+supportedRCPVRange = mkVersionRange (VersionRCP 1) currentRCPVersion
 
 data IpProbe = IpProbe
-  { versionRange :: VersionRange,
+  { versionRange :: VersionRangeRCP,
     randomNonce :: ByteString
   }
   deriving (Show)
 
 instance Encoding IpProbe where
   smpEncode IpProbe {versionRange, randomNonce} = smpEncode (versionRange, 'I', randomNonce)
-
   smpP = IpProbe <$> (smpP <* "I") *> smpP
 
 -- * Session
 
 data RCHostHello = RCHostHello
-  { v :: Version,
+  { v :: VersionRCP,
     ca :: C.KeyHash,
     app :: J.Value,
     kem :: KEMPublicKey

tests/AgentTests.hs

@@ -4,6 +4,7 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE PostfixOperators #-}
+{-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeApplications #-}
 {-# OPTIONS_GHC -fno-warn-incomplete-uni-patterns #-}
@@ -12,28 +13,32 @@ module AgentTests (agentTests) where
 
 import AgentTests.ConnectionRequestTests
 import AgentTests.DoubleRatchetTests (doubleRatchetTests)
-import AgentTests.FunctionalAPITests (functionalAPITests)
+import AgentTests.FunctionalAPITests (functionalAPITests, pattern Msg, pattern Msg')
 import AgentTests.MigrationTests (migrationTests)
 import AgentTests.NotificationTests (notificationTests)
 import AgentTests.SQLiteTests (storeTests)
 import Control.Concurrent
-import Control.Monad (forM_)
+import Control.Monad (forM_, when)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
+import Data.Maybe (fromJust)
 import Data.Type.Equality
 import GHC.Stack (withFrozenCallStack)
 import Network.HTTP.Types (urlEncode)
 import SMPAgentClient
 import SMPClient (testKeyHash, testPort, testPort2, testStoreLogFile, withSmpServer, withSmpServerStoreLogOn)
-import Simplex.Messaging.Agent.Protocol
+import Simplex.Messaging.Agent.Protocol hiding (MID, CONF, INFO, REQ)
 import qualified Simplex.Messaging.Agent.Protocol as A
+import Simplex.Messaging.Crypto.Ratchet (InitialKeys (..), PQEncryption (..), PQSupport (..), pattern IKPQOn, pattern IKPQOff, pattern PQEncOn, pattern PQSupportOn, pattern PQSupportOff)
+import qualified Simplex.Messaging.Crypto.Ratchet as CR
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (ErrorType (..), MsgBody)
+import Simplex.Messaging.Protocol (ErrorType (..))
 import Simplex.Messaging.Transport (ATransport (..), TProxy (..), Transport (..))
 import Simplex.Messaging.Util (bshow)
 import System.Directory (removeFile)
 import System.Timeout
 import Test.Hspec
+import Util
 
 agentTests :: ATransport -> Spec
 agentTests (ATransport t) = do
@@ -44,24 +49,26 @@ agentTests (ATransport t) = do
   describe "SQLite store" storeTests
   describe "Migration tests" migrationTests
   describe "SMP agent protocol syntax" $ syntaxTests t
-  describe "Establishing duplex connection" $ do
-    it "should connect via one server and one agent" $ do
-      smpAgentTest2_1_1 $ testDuplexConnection t
-    it "should connect via one server and one agent (random IDs)" $ do
-      smpAgentTest2_1_1 $ testDuplexConnRandomIds t
+  describe "Establishing duplex connection (via agent protocol)" $ do
+    skip "These tests are disabled because the agent does not work correctly with multiple connected TCP clients" $
+      describe "one agent" $ do
+        it "should connect via one server and one agent" $ do
+          smpAgentTest2_1_1 $ testDuplexConnection t
+        it "should connect via one server and one agent (random IDs)" $ do
+          smpAgentTest2_1_1 $ testDuplexConnRandomIds t
     it "should connect via one server and 2 agents" $ do
       smpAgentTest2_2_1 $ testDuplexConnection t
     it "should connect via one server and 2 agents (random IDs)" $ do
       smpAgentTest2_2_1 $ testDuplexConnRandomIds t
-    it "should connect via 2 servers and 2 agents" $ do
-      smpAgentTest2_2_2 $ testDuplexConnection t
-    it "should connect via 2 servers and 2 agents (random IDs)" $ do
-      smpAgentTest2_2_2 $ testDuplexConnRandomIds t
+    describe "should connect via 2 servers and 2 agents" $ do
+      pqMatrix2 t smpAgentTest2_2_2 testDuplexConnection'
+    describe "should connect via 2 servers and 2 agents (random IDs)" $ do
+      pqMatrix2 t smpAgentTest2_2_2 testDuplexConnRandomIds'
   describe "Establishing connections via `contact connection`" $ do
-    it "should connect via contact connection with one server and 3 agents" $ do
-      smpAgentTest3 $ testContactConnection t
-    it "should connect via contact connection with one server and 2 agents (random IDs)" $ do
-      smpAgentTest2_2_1 $ testContactConnRandomIds t
+    describe "should connect via contact connection with one server and 3 agents" $ do
+      pqMatrix3 t smpAgentTest3 testContactConnection
+    describe "should connect via contact connection with one server and 2 agents (random IDs)" $ do
+      pqMatrix2NoInv t smpAgentTest2_2_1 testContactConnRandomIds
     it "should support rejecting contact request" $ do
       smpAgentTest2_2_1 $ testRejectContactRequest t
   describe "Connection subscriptions" $ do
@@ -70,8 +77,8 @@ agentTests (ATransport t) = do
     it "should send notifications to client when server disconnects" $ do
       smpAgentServerTest $ testSubscrNotification t
   describe "Message delivery and server reconnection" $ do
-    it "should deliver messages after losing server connection and re-connecting" $ do
-      smpAgentTest2_2_2_needs_server $ testMsgDeliveryServerRestart t
+    describe "should deliver messages after losing server connection and re-connecting" $
+      pqMatrix2 t smpAgentTest2_2_2_needs_server testMsgDeliveryServerRestart
     it "should connect to the server when server goes up if it initially was down" $ do
       smpAgentTestN [] $ testServerConnectionAfterError t
     it "should deliver pending messages after agent restarting" $ do
@@ -131,24 +138,27 @@ action #> (corrId, connId, cmd) = withFrozenCallStack $ action `shouldReturn` (c
 (=#>) :: IO (AEntityTransmissionOrError 'Agent 'AEConn) -> (AEntityTransmission 'Agent 'AEConn -> Bool) -> Expectation
 action =#> p = withFrozenCallStack $ action >>= (`shouldSatisfy` p . correctTransmission)
 
+pattern MID :: AgentMsgId -> ACommand 'Agent 'AEConn
+pattern MID msgId = A.MID msgId PQEncOn
+
 correctTransmission :: (ACorrId, ConnId, Either AgentErrorType cmd) -> (ACorrId, ConnId, cmd)
 correctTransmission (corrId, connId, cmdOrErr) = case cmdOrErr of
   Right cmd -> (corrId, connId, cmd)
   Left e -> error $ show e
 
 -- | receive message to handle `h` and validate that it is the expected one
-(<#) :: Transport c => c -> AEntityTransmission 'Agent 'AEConn -> Expectation
-h <# (corrId, connId, cmd) = (h <#:) `shouldReturn` (corrId, connId, Right cmd)
+(<#) :: (HasCallStack, Transport c) => c -> AEntityTransmission 'Agent 'AEConn -> Expectation
+h <# (corrId, connId, cmd) = timeout 5000000 (h <#:) `shouldReturn` Just (corrId, connId, Right cmd)
 
-(<#.) :: Transport c => c -> AEntityTransmission 'Agent 'AENone -> Expectation
-h <#. (corrId, connId, cmd) = (h <#:.) `shouldReturn` (corrId, connId, Right cmd)
+(<#.) :: (HasCallStack, Transport c) => c -> AEntityTransmission 'Agent 'AENone -> Expectation
+h <#. (corrId, connId, cmd) = timeout 5000000 (h <#:.) `shouldReturn` Just (corrId, connId, Right cmd)
 
 -- | receive message to handle `h` and validate it using predicate `p`
-(<#=) :: Transport c => c -> (AEntityTransmission 'Agent 'AEConn -> Bool) -> Expectation
-h <#= p = (h <#:) >>= (`shouldSatisfy` p . correctTransmission)
+(<#=) :: (HasCallStack, Transport c) => c -> (AEntityTransmission 'Agent 'AEConn -> Bool) -> Expectation
+h <#= p = timeout 5000000 (h <#:) >>= (`shouldSatisfy` p . correctTransmission . fromJust)
 
-(<#=?) :: Transport c => c -> (ATransmission 'Agent -> Bool) -> Expectation
-h <#=? p = (h <#:?) >>= (`shouldSatisfy` p . correctTransmission)
+(<#=?) :: (HasCallStack, Transport c) => c -> (ATransmission 'Agent -> Bool) -> Expectation
+h <#=? p = timeout 5000000 (h <#:?) >>= (`shouldSatisfy` p . correctTransmission . fromJust)
 
 -- | test that nothing is delivered to handle `h` during 10ms
 (#:#) :: Transport c => c -> String -> Expectation
@@ -159,127 +169,188 @@ h #:# err = tryGet `shouldReturn` ()
         Just _ -> error err
         _ -> return ()
 
-pattern Msg :: MsgBody -> ACommand 'Agent e
-pattern Msg msgBody <- MSG MsgMeta {integrity = MsgOk} _ msgBody
+type PQMatrix2 c =
+  HasCallStack =>
+  TProxy c ->
+  (HasCallStack => (c -> c -> IO ()) -> Expectation) ->
+  (HasCallStack => (c, InitialKeys) -> (c, PQSupport) -> IO ()) ->
+  Spec
 
-testDuplexConnection :: Transport c => TProxy c -> c -> c -> IO ()
-testDuplexConnection _ alice bob = do
-  ("1", "bob", Right (INV cReq)) <- alice #: ("1", "bob", "NEW T INV subscribe")
+pqMatrix2 :: PQMatrix2 c
+pqMatrix2 = pqMatrix2_ True
+
+pqMatrix2NoInv :: PQMatrix2 c
+pqMatrix2NoInv = pqMatrix2_ False
+
+pqMatrix2_ :: Bool -> PQMatrix2 c
+pqMatrix2_ pqInv _ smpTest test = do
+  it "dh/dh handshake" $ smpTest $ \a b -> test (a, IKPQOff) (b, PQSupportOff)
+  it "dh/pq handshake" $ smpTest $ \a b -> test (a, IKPQOff) (b, PQSupportOn)
+  it "pq/dh handshake" $ smpTest $ \a b -> test (a, IKPQOn) (b, PQSupportOff)
+  it "pq/pq handshake" $ smpTest $ \a b -> test (a, IKPQOn) (b, PQSupportOn)
+  when pqInv $ do
+    it "pq-inv/dh handshake" $ smpTest $ \a b -> test (a, IKUsePQ) (b, PQSupportOff)
+    it "pq-inv/pq handshake" $ smpTest $ \a b -> test (a, IKUsePQ) (b, PQSupportOn)
+
+pqMatrix3 ::
+  HasCallStack =>
+  TProxy c -> 
+  (HasCallStack => (c -> c -> c -> IO ()) -> Expectation) -> 
+  (HasCallStack => (c, InitialKeys) -> (c, PQSupport) -> (c, PQSupport) -> IO ()) ->
+  Spec
+pqMatrix3 _ smpTest test = do
+  it "dh" $ smpTest $ \a b c -> test (a, IKPQOff) (b, PQSupportOff) (c, PQSupportOff)
+  it "dh/dh/pq" $ smpTest $ \a b c -> test (a, IKPQOff) (b, PQSupportOff) (c, PQSupportOn)
+  it "dh/pq/dh" $ smpTest $ \a b c -> test (a, IKPQOff) (b, PQSupportOn) (c, PQSupportOff)
+  it "dh/pq/pq" $ smpTest $ \a b c -> test (a, IKPQOff) (b, PQSupportOn) (c, PQSupportOn)
+  it "pq/dh/dh" $ smpTest $ \a b c -> test (a, IKPQOn) (b, PQSupportOff) (c, PQSupportOff)
+  it "pq/dh/pq" $ smpTest $ \a b c -> test (a, IKPQOn) (b, PQSupportOff) (c, PQSupportOn)
+  it "pq/pq/dh" $ smpTest $ \a b c -> test (a, IKPQOn) (b, PQSupportOn) (c, PQSupportOff)
+  it "pq" $ smpTest $ \a b c -> test (a, IKPQOn) (b, PQSupportOn) (c, PQSupportOn)
+
+testDuplexConnection :: (HasCallStack, Transport c) => TProxy c -> c -> c -> IO ()
+testDuplexConnection _ alice bob = testDuplexConnection' (alice, IKPQOn) (bob, PQSupportOn)
+
+testDuplexConnection' :: (HasCallStack, Transport c) => (c, InitialKeys) -> (c, PQSupport) -> IO ()
+testDuplexConnection' (alice, aPQ) (bob, bPQ) = do
+  let pq = pqConnectionMode aPQ bPQ
+      pqSup = CR.pqEncToSupport pq
+  ("1", "bob", Right (INV cReq)) <- alice #: ("1", "bob", "NEW T INV" <> pqConnModeStr aPQ <> " subscribe")
   let cReq' = strEncode cReq
-  bob #: ("11", "alice", "JOIN T " <> cReq' <> " subscribe 14\nbob's connInfo") #> ("11", "alice", OK)
-  ("", "bob", Right (CONF confId _ "bob's connInfo")) <- (alice <#:)
+  bob #: ("11", "alice", "JOIN T " <> cReq' <> enableKEMStr bPQ <> " subscribe 14\nbob's connInfo") #> ("11", "alice", OK)
+  ("", "bob", Right (A.CONF confId pqSup' _ "bob's connInfo")) <- (alice <#:)
+  pqSup' `shouldBe` pqSup
   alice #: ("2", "bob", "LET " <> confId <> " 16\nalice's connInfo") #> ("2", "bob", OK)
-  bob <# ("", "alice", INFO "alice's connInfo")
-  bob <# ("", "alice", CON)
-  alice <# ("", "bob", CON)
+  bob <# ("", "alice", A.INFO pqSup "alice's connInfo")
+  bob <# ("", "alice", CON pq)
+  alice <# ("", "bob", CON pq)
   -- message IDs 1 to 3 get assigned to control messages, so first MSG is assigned ID 4
-  alice #: ("3", "bob", "SEND F :hello") #> ("3", "bob", MID 4)
+  alice #: ("3", "bob", "SEND F :hello") #> ("3", "bob", A.MID 4 pq)
   alice <# ("", "bob", SENT 4)
-  bob <#= \case ("", "alice", Msg "hello") -> True; _ -> False
+  bob <#= \case ("", "alice", Msg' 4 pq' "hello") -> pq == pq'; _ -> False
   bob #: ("12", "alice", "ACK 4") #> ("12", "alice", OK)
-  alice #: ("4", "bob", "SEND F :how are you?") #> ("4", "bob", MID 5)
+  alice #: ("4", "bob", "SEND F :how are you?") #> ("4", "bob", A.MID 5 pq)
   alice <# ("", "bob", SENT 5)
-  bob <#= \case ("", "alice", Msg "how are you?") -> True; _ -> False
+  bob <#= \case ("", "alice", Msg' 5 pq' "how are you?") -> pq == pq'; _ -> False
   bob #: ("13", "alice", "ACK 5") #> ("13", "alice", OK)
-  bob #: ("14", "alice", "SEND F 9\nhello too") #> ("14", "alice", MID 6)
+  bob #: ("14", "alice", "SEND F 9\nhello too") #> ("14", "alice", A.MID 6 pq)
   bob <# ("", "alice", SENT 6)
-  alice <#= \case ("", "bob", Msg "hello too") -> True; _ -> False
+  alice <#= \case ("", "bob", Msg' 6 pq' "hello too") -> pq == pq'; _ -> False
   alice #: ("3a", "bob", "ACK 6") #> ("3a", "bob", OK)
-  bob #: ("15", "alice", "SEND F 9\nmessage 1") #> ("15", "alice", MID 7)
+  bob #: ("15", "alice", "SEND F 9\nmessage 1") #> ("15", "alice", A.MID 7 pq)
   bob <# ("", "alice", SENT 7)
-  alice <#= \case ("", "bob", Msg "message 1") -> True; _ -> False
+  alice <#= \case ("", "bob", Msg' 7 pq' "message 1") -> pq == pq'; _ -> False
   alice #: ("4a", "bob", "ACK 7") #> ("4a", "bob", OK)
   alice #: ("5", "bob", "OFF") #> ("5", "bob", OK)
-  bob #: ("17", "alice", "SEND F 9\nmessage 3") #> ("17", "alice", MID 8)
+  bob #: ("17", "alice", "SEND F 9\nmessage 3") #> ("17", "alice", A.MID 8 pq)
   bob <# ("", "alice", MERR 8 (SMP AUTH))
   alice #: ("6", "bob", "DEL") #> ("6", "bob", OK)
   alice #:# "nothing else should be delivered to alice"
 
-testDuplexConnRandomIds :: Transport c => TProxy c -> c -> c -> IO ()
-testDuplexConnRandomIds _ alice bob = do
-  ("1", bobConn, Right (INV cReq)) <- alice #: ("1", "", "NEW T INV subscribe")
+testDuplexConnRandomIds :: (HasCallStack, Transport c) => TProxy c -> c -> c -> IO ()
+testDuplexConnRandomIds _ alice bob = testDuplexConnRandomIds' (alice, IKPQOn) (bob, PQSupportOn)
+
+testDuplexConnRandomIds' :: (HasCallStack, Transport c) => (c, InitialKeys) -> (c, PQSupport) -> IO ()
+testDuplexConnRandomIds' (alice, aPQ) (bob, bPQ) = do
+  let pq = pqConnectionMode aPQ bPQ
+      pqSup = CR.pqEncToSupport pq
+  ("1", bobConn, Right (INV cReq)) <- alice #: ("1", "", "NEW T INV" <> pqConnModeStr aPQ <> " subscribe")
   let cReq' = strEncode cReq
-  ("11", aliceConn, Right OK) <- bob #: ("11", "", "JOIN T " <> cReq' <> " subscribe 14\nbob's connInfo")
-  ("", bobConn', Right (CONF confId _ "bob's connInfo")) <- (alice <#:)
+  ("11", aliceConn, Right OK) <- bob #: ("11", "", "JOIN T " <> cReq' <> enableKEMStr bPQ <> " subscribe 14\nbob's connInfo")
+  ("", bobConn', Right (A.CONF confId pqSup' _ "bob's connInfo")) <- (alice <#:)
+  pqSup' `shouldBe` pqSup
   bobConn' `shouldBe` bobConn
   alice #: ("2", bobConn, "LET " <> confId <> " 16\nalice's connInfo") =#> \case ("2", c, OK) -> c == bobConn; _ -> False
-  bob <# ("", aliceConn, INFO "alice's connInfo")
-  bob <# ("", aliceConn, CON)
-  alice <# ("", bobConn, CON)
-  alice #: ("2", bobConn, "SEND F :hello") #> ("2", bobConn, MID 4)
+  bob <# ("", aliceConn, A.INFO pqSup "alice's connInfo")
+  bob <# ("", aliceConn, CON pq)
+  alice <# ("", bobConn, CON pq)
+  alice #: ("2", bobConn, "SEND F :hello") #> ("2", bobConn, A.MID 4 pq)
   alice <# ("", bobConn, SENT 4)
-  bob <#= \case ("", c, Msg "hello") -> c == aliceConn; _ -> False
+  bob <#= \case ("", c, Msg' 4 pq' "hello") -> c == aliceConn && pq == pq'; _ -> False
   bob #: ("12", aliceConn, "ACK 4") #> ("12", aliceConn, OK)
-  alice #: ("3", bobConn, "SEND F :how are you?") #> ("3", bobConn, MID 5)
+  alice #: ("3", bobConn, "SEND F :how are you?") #> ("3", bobConn, A.MID 5 pq)
   alice <# ("", bobConn, SENT 5)
-  bob <#= \case ("", c, Msg "how are you?") -> c == aliceConn; _ -> False
+  bob <#= \case ("", c, Msg' 5 pq' "how are you?") -> c == aliceConn && pq == pq'; _ -> False
   bob #: ("13", aliceConn, "ACK 5") #> ("13", aliceConn, OK)
-  bob #: ("14", aliceConn, "SEND F 9\nhello too") #> ("14", aliceConn, MID 6)
+  bob #: ("14", aliceConn, "SEND F 9\nhello too") #> ("14", aliceConn, A.MID 6 pq)
   bob <# ("", aliceConn, SENT 6)
-  alice <#= \case ("", c, Msg "hello too") -> c == bobConn; _ -> False
+  alice <#= \case ("", c, Msg' 6 pq' "hello too") -> c == bobConn && pq == pq'; _ -> False
   alice #: ("3a", bobConn, "ACK 6") #> ("3a", bobConn, OK)
-  bob #: ("15", aliceConn, "SEND F 9\nmessage 1") #> ("15", aliceConn, MID 7)
+  bob #: ("15", aliceConn, "SEND F 9\nmessage 1") #> ("15", aliceConn, A.MID 7 pq)
   bob <# ("", aliceConn, SENT 7)
-  alice <#= \case ("", c, Msg "message 1") -> c == bobConn; _ -> False
+  alice <#= \case ("", c, Msg' 7 pq' "message 1") -> c == bobConn && pq == pq'; _ -> False
   alice #: ("4a", bobConn, "ACK 7") #> ("4a", bobConn, OK)
   alice #: ("5", bobConn, "OFF") #> ("5", bobConn, OK)
-  bob #: ("17", aliceConn, "SEND F 9\nmessage 3") #> ("17", aliceConn, MID 8)
+  bob #: ("17", aliceConn, "SEND F 9\nmessage 3") #> ("17", aliceConn, A.MID 8 pq)
   bob <# ("", aliceConn, MERR 8 (SMP AUTH))
   alice #: ("6", bobConn, "DEL") #> ("6", bobConn, OK)
   alice #:# "nothing else should be delivered to alice"
 
-testContactConnection :: Transport c => TProxy c -> c -> c -> c -> IO ()
-testContactConnection _ alice bob tom = do
-  ("1", "alice_contact", Right (INV cReq)) <- alice #: ("1", "alice_contact", "NEW T CON subscribe")
+testContactConnection :: Transport c => (c, InitialKeys) -> (c, PQSupport) -> (c, PQSupport) -> IO ()
+testContactConnection (alice, aPQ) (bob, bPQ) (tom, tPQ) = do
+  ("1", "alice_contact", Right (INV cReq)) <- alice #: ("1", "alice_contact", "NEW T CON" <> pqConnModeStr aPQ <> " subscribe")
   let cReq' = strEncode cReq
+      abPQ = pqConnectionMode aPQ bPQ
+      abPQSup = CR.pqEncToSupport abPQ
+      aPQMode = CR.connPQEncryption aPQ
 
-  bob #: ("11", "alice", "JOIN T " <> cReq' <> " subscribe 14\nbob's connInfo") #> ("11", "alice", OK)
-  ("", "alice_contact", Right (REQ aInvId _ "bob's connInfo")) <- (alice <#:)
-  alice #: ("2", "bob", "ACPT " <> aInvId <> " 16\nalice's connInfo") #> ("2", "bob", OK)
-  ("", "alice", Right (CONF bConfId _ "alice's connInfo")) <- (bob <#:)
+  bob #: ("11", "alice", "JOIN T " <> cReq' <> enableKEMStr bPQ <> " subscribe 14\nbob's connInfo") #> ("11", "alice", OK)
+  ("", "alice_contact", Right (A.REQ aInvId pqSup' _ "bob's connInfo")) <- (alice <#:)
+  pqSup' `shouldBe` bPQ
+  alice #: ("2", "bob", "ACPT " <> aInvId <> enableKEMStr aPQMode <> " 16\nalice's connInfo") #> ("2", "bob", OK)
+  ("", "alice", Right (A.CONF bConfId pqSup'' _ "alice's connInfo")) <- (bob <#:)
+  pqSup'' `shouldBe` abPQSup
   bob #: ("12", "alice", "LET " <> bConfId <> " 16\nbob's connInfo 2") #> ("12", "alice", OK)
-  alice <# ("", "bob", INFO "bob's connInfo 2")
-  alice <# ("", "bob", CON)
-  bob <# ("", "alice", CON)
-  alice #: ("3", "bob", "SEND F :hi") #> ("3", "bob", MID 4)
+  alice <# ("", "bob", A.INFO abPQSup "bob's connInfo 2")
+  alice <# ("", "bob", CON abPQ)
+  bob <# ("", "alice", CON abPQ)
+  alice #: ("3", "bob", "SEND F :hi") #> ("3", "bob", A.MID 4 abPQ)
   alice <# ("", "bob", SENT 4)
-  bob <#= \case ("", "alice", Msg "hi") -> True; _ -> False
+  bob <#= \case ("", "alice", Msg' 4 pq' "hi") -> pq' == abPQ; _ -> False
   bob #: ("13", "alice", "ACK 4") #> ("13", "alice", OK)
 
-  tom #: ("21", "alice", "JOIN T " <> cReq' <> " subscribe 14\ntom's connInfo") #> ("21", "alice", OK)
-  ("", "alice_contact", Right (REQ aInvId' _ "tom's connInfo")) <- (alice <#:)
-  alice #: ("4", "tom", "ACPT " <> aInvId' <> " 16\nalice's connInfo") #> ("4", "tom", OK)
-  ("", "alice", Right (CONF tConfId _ "alice's connInfo")) <- (tom <#:)
+  let atPQ = pqConnectionMode aPQ tPQ
+      atPQSup = CR.pqEncToSupport atPQ
+  tom #: ("21", "alice", "JOIN T " <> cReq' <> enableKEMStr tPQ <> " subscribe 14\ntom's connInfo") #> ("21", "alice", OK)
+  ("", "alice_contact", Right (A.REQ aInvId' pqSup3 _ "tom's connInfo")) <- (alice <#:)
+  pqSup3 `shouldBe` tPQ
+  alice #: ("4", "tom", "ACPT " <> aInvId' <> enableKEMStr aPQMode <> " 16\nalice's connInfo") #> ("4", "tom", OK)
+  ("", "alice", Right (A.CONF tConfId pqSup4 _ "alice's connInfo")) <- (tom <#:)
+  pqSup4 `shouldBe` atPQSup
   tom #: ("22", "alice", "LET " <> tConfId <> " 16\ntom's connInfo 2") #> ("22", "alice", OK)
-  alice <# ("", "tom", INFO "tom's connInfo 2")
-  alice <# ("", "tom", CON)
-  tom <# ("", "alice", CON)
-  alice #: ("5", "tom", "SEND F :hi there") #> ("5", "tom", MID 4)
+  alice <# ("", "tom", A.INFO atPQSup "tom's connInfo 2")
+  alice <# ("", "tom", CON atPQ)
+  tom <# ("", "alice", CON atPQ)
+  alice #: ("5", "tom", "SEND F :hi there") #> ("5", "tom", A.MID 4 atPQ)
   alice <# ("", "tom", SENT 4)
-  tom <#= \case ("", "alice", Msg "hi there") -> True; _ -> False
+  tom <#= \case ("", "alice", Msg' 4 pq' "hi there") -> pq' == atPQ; _ -> False
   tom #: ("23", "alice", "ACK 4") #> ("23", "alice", OK)
 
-testContactConnRandomIds :: Transport c => TProxy c -> c -> c -> IO ()
-testContactConnRandomIds _ alice bob = do
-  ("1", aliceContact, Right (INV cReq)) <- alice #: ("1", "", "NEW T CON subscribe")
+testContactConnRandomIds :: Transport c => (c, InitialKeys) -> (c, PQSupport) -> IO ()
+testContactConnRandomIds (alice, aPQ) (bob, bPQ) = do
+  let pq = pqConnectionMode aPQ bPQ
+      pqSup = CR.pqEncToSupport pq
+  ("1", aliceContact, Right (INV cReq)) <- alice #: ("1", "", "NEW T CON" <> pqConnModeStr aPQ <> " subscribe")
   let cReq' = strEncode cReq
 
-  ("11", aliceConn, Right OK) <- bob #: ("11", "", "JOIN T " <> cReq' <> " subscribe 14\nbob's connInfo")
-  ("", aliceContact', Right (REQ aInvId _ "bob's connInfo")) <- (alice <#:)
+  ("11", aliceConn, Right OK) <- bob #: ("11", "", "JOIN T " <> cReq' <> enableKEMStr bPQ <> " subscribe 14\nbob's connInfo")
+  ("", aliceContact', Right (A.REQ aInvId pqSup' _ "bob's connInfo")) <- (alice <#:)
+  pqSup' `shouldBe` bPQ
   aliceContact' `shouldBe` aliceContact
 
-  ("2", bobConn, Right OK) <- alice #: ("2", "", "ACPT " <> aInvId <> " 16\nalice's connInfo")
-  ("", aliceConn', Right (CONF bConfId _ "alice's connInfo")) <- (bob <#:)
+  ("2", bobConn, Right OK) <- alice #: ("2", "", "ACPT " <> aInvId <> enableKEMStr (CR.connPQEncryption aPQ) <> " 16\nalice's connInfo")
+  ("", aliceConn', Right (A.CONF bConfId pqSup'' _ "alice's connInfo")) <- (bob <#:)
+  pqSup'' `shouldBe` pqSup
   aliceConn' `shouldBe` aliceConn
 
   bob #: ("12", aliceConn, "LET " <> bConfId <> " 16\nbob's connInfo 2") #> ("12", aliceConn, OK)
-  alice <# ("", bobConn, INFO "bob's connInfo 2")
-  alice <# ("", bobConn, CON)
-  bob <# ("", aliceConn, CON)
+  alice <# ("", bobConn, A.INFO pqSup "bob's connInfo 2")
+  alice <# ("", bobConn, CON pq)
+  bob <# ("", aliceConn, CON pq)
 
-  alice #: ("3", bobConn, "SEND F :hi") #> ("3", bobConn, MID 4)
+  alice #: ("3", bobConn, "SEND F :hi") #> ("3", bobConn, A.MID 4 pq)
   alice <# ("", bobConn, SENT 4)
-  bob <#= \case ("", c, Msg "hi") -> c == aliceConn; _ -> False
+  bob <#= \case ("", c, Msg' 4 pq' "hi") -> c == aliceConn && pq == pq'; _ -> False
   bob #: ("13", aliceConn, "ACK 4") #> ("13", aliceConn, OK)
 
 testRejectContactRequest :: Transport c => TProxy c -> c -> c -> IO ()
@@ -287,7 +358,7 @@ testRejectContactRequest _ alice bob = do
   ("1", "a_contact", Right (INV cReq)) <- alice #: ("1", "a_contact", "NEW T CON subscribe")
   let cReq' = strEncode cReq
   bob #: ("11", "alice", "JOIN T " <> cReq' <> " subscribe 10\nbob's info") #> ("11", "alice", OK)
-  ("", "a_contact", Right (REQ aInvId _ "bob's info")) <- (alice <#:)
+  ("", "a_contact", Right (A.REQ aInvId PQSupportOff _ "bob's info")) <- (alice <#:)
   -- RJCT must use correct contact connection
   alice #: ("2a", "bob", "RJCT " <> aInvId) #> ("2a", "bob", ERR $ CONN NOT_FOUND)
   alice #: ("2b", "a_contact", "RJCT " <> aInvId) #> ("2b", "a_contact", OK)
@@ -322,31 +393,32 @@ testSubscrNotification t (server, _) client = do
   withSmpServer (ATransport t) $
     client <# ("", "conn1", ERR (SMP AUTH)) -- this new server does not have the queue
 
-testMsgDeliveryServerRestart :: Transport c => TProxy c -> c -> c -> IO ()
-testMsgDeliveryServerRestart t alice bob = do
+testMsgDeliveryServerRestart :: forall c. Transport c => (c, InitialKeys) -> (c, PQSupport) -> IO ()
+testMsgDeliveryServerRestart (alice, aPQ) (bob, bPQ) = do
+  let pq = pqConnectionMode aPQ bPQ
   withServer $ do
-    connect (alice, "alice") (bob, "bob")
-    bob #: ("1", "alice", "SEND F 2\nhi") #> ("1", "alice", MID 4)
+    connect' (alice, "alice", aPQ) (bob, "bob", bPQ)
+    bob #: ("1", "alice", "SEND F 2\nhi") #> ("1", "alice", A.MID 4 pq)
     bob <# ("", "alice", SENT 4)
-    alice <#= \case ("", "bob", Msg "hi") -> True; _ -> False
+    alice <#= \case ("", "bob", Msg' _ pq' "hi") -> pq == pq'; _ -> False
     alice #: ("11", "bob", "ACK 4") #> ("11", "bob", OK)
     alice #:# "nothing else delivered before the server is killed"
 
   let server = SMPServer "localhost" testPort2 testKeyHash
   alice <#. ("", "", DOWN server ["bob"])
-  bob #: ("2", "alice", "SEND F 11\nhello again") #> ("2", "alice", MID 5)
+  bob #: ("2", "alice", "SEND F 11\nhello again") #> ("2", "alice", A.MID 5 pq)
   bob #:# "nothing else delivered before the server is restarted"
   alice #:# "nothing else delivered before the server is restarted"
 
   withServer $ do
     bob <# ("", "alice", SENT 5)
     alice <#. ("", "", UP server ["bob"])
-    alice <#= \case ("", "bob", Msg "hello again") -> True; _ -> False
+    alice <#= \case ("", "bob", Msg' _ pq' "hello again") -> pq == pq'; _ -> False
     alice #: ("12", "bob", "ACK 5") #> ("12", "bob", OK)
 
   removeFile testStoreLogFile
   where
-    withServer test' = withSmpServerStoreLogOn (ATransport t) testPort2 (const test') `shouldReturn` ()
+    withServer test' = withSmpServerStoreLogOn (transport @c) testPort2 (const test') `shouldReturn` ()
 
 testServerConnectionAfterError :: forall c. Transport c => TProxy c -> [c] -> IO ()
 testServerConnectionAfterError t _ = do
@@ -354,7 +426,6 @@ testServerConnectionAfterError t _ = do
     withAgent2 $ \alice -> do
       withServer $ do
         connect (bob, "bob") (alice, "alice")
-
       bob <#. ("", "", DOWN server ["alice"])
       alice <#. ("", "", DOWN server ["bob"])
       alice #: ("1", "bob", "SEND F 5\nhello") #> ("1", "bob", MID 4)
@@ -381,10 +452,10 @@ testServerConnectionAfterError t _ = do
   where
     server = SMPServer "localhost" testPort2 testKeyHash
     withServer test' = withSmpServerStoreLogOn (ATransport t) testPort2 (const test') `shouldReturn` ()
-    withAgent1 = withAgent agentTestPort testDB
-    withAgent2 = withAgent agentTestPort2 testDB2
-    withAgent :: String -> FilePath -> (c -> IO a) -> IO a
-    withAgent agentPort agentDB = withSmpAgentThreadOn_ (ATransport t) (agentPort, testPort2, agentDB) (pure ()) . const . testSMPAgentClientOn agentPort
+    withAgent1 = withAgent agentTestPort testDB 0 
+    withAgent2 = withAgent agentTestPort2 testDB2 10
+    withAgent :: String -> FilePath -> Int -> (c -> IO a) -> IO a
+    withAgent agentPort agentDB initClientId = withSmpAgentThreadOn_ (ATransport t) (agentPort, testPort2, agentDB) initClientId (pure ()) . const . testSMPAgentClientOn agentPort
 
 testMsgDeliveryAgentRestart :: Transport c => TProxy c -> c -> IO ()
 testMsgDeliveryAgentRestart t bob = do
@@ -419,7 +490,7 @@ testMsgDeliveryAgentRestart t bob = do
   removeFile testDB
   where
     withServer test' = withSmpServerStoreLogOn (ATransport t) testPort2 (const test') `shouldReturn` ()
-    withAgent = withSmpAgentThreadOn_ (ATransport t) (agentTestPort, testPort, testDB) (pure ()) . const . testSMPAgentClientOn agentTestPort
+    withAgent = withSmpAgentThreadOn_ (ATransport t) (agentTestPort, testPort, testDB) 0 (pure ()) . const . testSMPAgentClientOn agentTestPort
 
 testConcurrentMsgDelivery :: Transport c => TProxy c -> c -> c -> IO ()
 testConcurrentMsgDelivery _ alice bob = do
@@ -428,7 +499,7 @@ testConcurrentMsgDelivery _ alice bob = do
   ("1", "bob2", Right (INV cReq)) <- alice #: ("1", "bob2", "NEW T INV subscribe")
   let cReq' = strEncode cReq
   bob #: ("11", "alice2", "JOIN T " <> cReq' <> " subscribe 14\nbob's connInfo") #> ("11", "alice2", OK)
-  ("", "bob2", Right (CONF _confId _ "bob's connInfo")) <- (alice <#:)
+  ("", "bob2", Right (A.CONF _confId PQSupportOff _ "bob's connInfo")) <- (alice <#:)
   -- below commands would be needed to accept bob's connection, but alice does not
   -- alice #: ("2", "bob", "LET " <> _confId <> " 16\nalice's connInfo") #> ("2", "bob", OK)
   -- bob <# ("", "alice", INFO "alice's connInfo")
@@ -488,16 +559,33 @@ testResumeDeliveryQuotaExceeded _ alice bob = do
   -- message 8 is skipped because of alice agent sending "QCONT" message
   bob #: ("5", "alice", "ACK 9") #> ("5", "alice", OK)
 
-connect :: forall c. Transport c => (c, ByteString) -> (c, ByteString) -> IO ()
-connect (h1, name1) (h2, name2) = do
-  ("c1", _, Right (INV cReq)) <- h1 #: ("c1", name2, "NEW T INV subscribe")
+connect :: Transport c => (c, ByteString) -> (c, ByteString) -> IO ()
+connect (h1, name1) (h2, name2) = connect' (h1, name1, IKPQOn) (h2, name2, PQSupportOn)
+
+connect' :: forall c. Transport c => (c, ByteString, InitialKeys) -> (c, ByteString, PQSupport) -> IO ()
+connect' (h1, name1, pqMode1) (h2, name2, pqMode2) = do
+  ("c1", _, Right (INV cReq)) <- h1 #: ("c1", name2, "NEW T INV" <> pqConnModeStr pqMode1 <> " subscribe")
   let cReq' = strEncode cReq
-  h2 #: ("c2", name1, "JOIN T " <> cReq' <> " subscribe 5\ninfo2") #> ("c2", name1, OK)
-  ("", _, Right (CONF connId _ "info2")) <- (h1 <#:)
+      pq = pqConnectionMode pqMode1 pqMode2
+      pqSup = CR.pqEncToSupport pq
+  h2 #: ("c2", name1, "JOIN T " <> cReq' <> enableKEMStr pqMode2 <> " subscribe 5\ninfo2") #> ("c2", name1, OK)
+  ("", _, Right (A.CONF connId pqSup' _ "info2")) <- (h1 <#:)
+  pqSup' `shouldBe` pqSup
   h1 #: ("c3", name2, "LET " <> connId <> " 5\ninfo1") #> ("c3", name2, OK)
-  h2 <# ("", name1, INFO "info1")
-  h2 <# ("", name1, CON)
-  h1 <# ("", name2, CON)
+  h2 <# ("", name1, A.INFO pqSup "info1")
+  h2 <# ("", name1, CON pq)
+  h1 <# ("", name2, CON pq)
+
+pqConnectionMode :: InitialKeys -> PQSupport -> PQEncryption
+pqConnectionMode pqMode1 pqMode2 = PQEncryption $ supportPQ (CR.connPQEncryption pqMode1) && supportPQ pqMode2
+
+enableKEMStr :: PQSupport -> ByteString
+enableKEMStr PQSupportOn = " " <> strEncode PQSupportOn
+enableKEMStr _ = ""
+
+pqConnModeStr :: InitialKeys -> ByteString
+pqConnModeStr (IKNoPQ PQSupportOff) = ""
+pqConnModeStr pq =  " " <> strEncode pq
 
 sendMessage :: Transport c => (c, ConnId) -> (c, ConnId) -> ByteString -> IO ()
 sendMessage (h1, name1) (h2, name2) msg = do
@@ -542,8 +630,8 @@ syntaxTests t = do
             <> urlEncode True "LcJUMfVhwD8yxjAiSaDzzGF3-kLG4Uh0Fl_ZIjrRwjI="
             <> "%40localhost%3A5001%2F3456-w%3D%3D%23"
             <> urlEncode True sampleDhKey
-            <> "&v=1"
-            <> "&e2e=v%3D1%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
+            <> "&v=2"
+            <> "&e2e=v%3D2%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
             <> " subscribe "
             <> "14\nbob's connInfo"
         )