add a test for imap capabilities offered from chatmail

acmetool: accept new terms of services

.github/workflows/test-and-deploy.yaml

@@ -4,12 +4,17 @@ on:
   push:
     branches:
       - main
-      - staging-ci
+  pull_request:
+    paths-ignore:
+      - 'scripts/**'
 
 jobs:
   deploy:
     name: deploy on staging.testrun.org, and run tests
     runs-on: ubuntu-latest
+    concurrency:
+      group: staging-deploy
+      cancel-in-progress: true
     steps:
       - uses: actions/checkout@v3
 
@@ -19,48 +24,57 @@ jobs:
           echo "${{ secrets.STAGING_SSH_KEY }}" >> ~/.ssh/id_ed25519
           chmod 600 ~/.ssh/id_ed25519
           ssh-keyscan staging.testrun.org > ~/.ssh/known_hosts
-     #    rsync -avz root@staging.testrun.org:/var/lib/acme . || true
-     #    rsync -avz root@staging.testrun.org:/var/lib/rspamd/dkim . || true
+          # save previous acme & dkim state
+          rsync -avz root@staging.testrun.org:/var/lib/acme . || true
+          rsync -avz root@staging.testrun.org:/etc/dkimkeys . || true
+          # store previous acme & dkim state on ns.testrun.org, if it contains useful certs
+          if [ -f dkimkeys/opendkim.private ]; then rsync -avz -e "ssh -o StrictHostKeyChecking=accept-new" dkimkeys root@ns.testrun.org:/tmp/ || true; fi
+          if [ -z "$(ls -A acme/certs)" ]; then rsync -avz -e "ssh -o StrictHostKeyChecking=accept-new" acme root@ns.testrun.org:/tmp/ || true; fi
 
-     #- name: rebuild staging.testrun.org to have a clean VPS
-     #  run: |
-     #      curl -X POST \
-     #      -H "Authorization: Bearer ${{ secrets.HETZNER_API_TOKEN }}" \
-     #      -H "Content-Type: application/json" \
-     #      -d '{"image":"debian-12"}' \
-     #      "https://api.hetzner.cloud/v1/servers/${{ secrets.STAGING_SERVER_ID }}/actions/rebuild"
+      - name: rebuild staging.testrun.org to have a clean VPS
+        run: |
+            curl -X POST \
+            -H "Authorization: Bearer ${{ secrets.HETZNER_API_TOKEN }}" \
+            -H "Content-Type: application/json" \
+            -d '{"image":"debian-12"}' \
+            "https://api.hetzner.cloud/v1/servers/${{ secrets.STAGING_SERVER_ID }}/actions/rebuild"
 
       - run: scripts/initenv.sh
 
       - name: append venv/bin to PATH
         run: echo venv/bin >>$GITHUB_PATH
 
+      - name: upload TLS cert after rebuilding
+        run: |
+          echo " --- wait until staging.testrun.org VPS is rebuilt --- "
+          rm ~/.ssh/known_hosts
+          while ! ssh -o ConnectTimeout=180 -o StrictHostKeyChecking=accept-new -v root@staging.testrun.org id -u ; do sleep 1 ; done
+          ssh -o StrictHostKeyChecking=accept-new -v root@staging.testrun.org id -u
+          # download acme & dkim state from ns.testrun.org
+          rsync -e "ssh -o StrictHostKeyChecking=accept-new" -avz root@ns.testrun.org:/tmp/acme acme-restore || true
+          rsync -avz root@ns.testrun.org:/tmp/dkimkeys dkimkeys-restore || true
+          # restore acme & dkim state to staging.testrun.org
+          rsync -avz acme-restore/acme/ root@staging.testrun.org:/var/lib/acme || true
+          rsync -avz dkimkeys-restore/dkimkeys/ root@staging.testrun.org:/etc/dkimkeys || true
+          ssh -o StrictHostKeyChecking=accept-new -v root@staging.testrun.org chown root:root -R /var/lib/acme || true
+
       - name: run formatting checks 
         run: cmdeploy fmt -v 
 
       - name: run deploy-chatmail offline tests 
         run: pytest --pyargs cmdeploy 
 
-     #- name: upload TLS cert after rebuilding
-     #  run: |
-     #    echo " --- wait until staging.testrun.org VPS is rebuilt --- "
-     #    rm ~/.ssh/known_hosts
-     #    while ! ssh -o ConnectTimeout=180 -o StrictHostKeyChecking=accept-new -v root@staging.testrun.org id -u ; do sleep 1 ; done
-     #    ssh -o StrictHostKeyChecking=accept-new -v root@staging.testrun.org id -u
-     #    rsync -avz acme root@staging.testrun.org:/var/lib/ || true
-     #    rsync -avz dkim root@staging.testrun.org:/var/lib/rspamd/ || true
-
       - run: cmdeploy init staging.testrun.org
 
       - run: cmdeploy run
 
       - name: set DNS entries
         run: |
-          #ssh -o StrictHostKeyChecking=accept-new -v root@staging.testrun.org chown _rspamd:_rspamd -R /var/lib/rspamd/dkim
+          ssh -o StrictHostKeyChecking=accept-new -v root@staging.testrun.org chown opendkim:opendkim -R /etc/dkimkeys
           cmdeploy dns --zonefile staging-generated.zone
           cat staging-generated.zone >> .github/workflows/staging.testrun.org-default.zone
           cat .github/workflows/staging.testrun.org-default.zone
-          scp -o StrictHostKeyChecking=accept-new .github/workflows/staging.testrun.org-default.zone root@ns.testrun.org:/etc/nsd/staging.testrun.org.zone
+          scp .github/workflows/staging.testrun.org-default.zone root@ns.testrun.org:/etc/nsd/staging.testrun.org.zone
           ssh root@ns.testrun.org nsd-checkzone staging.testrun.org /etc/nsd/staging.testrun.org.zone
           ssh root@ns.testrun.org systemctl reload nsd
 

CHANGELOG.md

@@ -1,8 +1,50 @@
 # Changelog for chatmail deployment 
 
-## unreleased
+## untagged
 
-### Changes since March 15th, 2024
+- Emit "XCHATMAIL" capability from IMAP server 
+  ([#278](https://github.com/deltachat/chatmail/pull/278))
+
+- Move echobot `into /var/lib/echobot`
+  ([#281](https://github.com/deltachat/chatmail/pull/281))
+
+- Accept Let's Encrypt's new Terms of Services
+  ([#275](https://github.com/deltachat/chatmail/pull/276))
+
+- Reload Dovecot and Postfix when TLS certificate updates
+  ([#271](https://github.com/deltachat/chatmail/pull/271))
+
+- Use forked version of dovecot without hardcoded delays
+  ([#270](https://github.com/deltachat/chatmail/pull/270))
+
+## 1.2.0 - 2024-04-04
+
+- Install dig on the server to resolve DNS records
+  ([#267](https://github.com/deltachat/chatmail/pull/267))
+
+- preserve notification order and exponentially backoff with 
+  retries for tokens where we didn't get a successful return
+  ([#265](https://github.com/deltachat/chatmail/pull/263))
+
+- Run chatmail-metadata and doveauth as vmail
+  ([#261](https://github.com/deltachat/chatmail/pull/261))
+
+- Apply systemd restrictions to echobot
+  ([#259](https://github.com/deltachat/chatmail/pull/259))
+
+- re-enable running the CI in pull requests, but not concurrently 
+  ([#258](https://github.com/deltachat/chatmail/pull/258))
+
+
+## 1.1.0 - 2024-03-28
+
+### The changelog starts to record changes from March 15th, 2024 
+
+- Move systemd unit templates to cmdeploy package 
+  ([#255](https://github.com/deltachat/chatmail/pull/255))
+
+- Persist push tokens and support multiple device per address 
+  ([#254](https://github.com/deltachat/chatmail/pull/254))
 
 - Avoid warning for regular doveauth protocol's hello message. 
   ([#250](https://github.com/deltachat/chatmail/pull/250))

README.md

@@ -159,4 +159,27 @@ While this file is present, account creation will be blocked.
 Delta Chat apps will, however, discover all ports and configurations
 automatically by reading the [autoconfig XML file](https://www.ietf.org/archive/id/draft-bucksch-autoconfig-00.html) from the chatmail service.
 
+## Email authentication
 
+chatmail servers rely on [DKIM](https://www.rfc-editor.org/rfc/rfc6376)
+to authenticate incoming emails.
+Incoming emails must have a valid DKIM signature with
+Signing Domain Identifier (SDID, `d=` parameter in the DKIM-Signature header)
+equal to the `From:` header domain.
+This property is checked by OpenDKIM screen policy script
+before validating the signatures.
+This correpsonds to strict [DMARC](https://www.rfc-editor.org/rfc/rfc7489) alignment (`adkim=s`),
+but chatmail does not rely on DMARC and does not consult the sender policy published in DMARC records.
+Other legacy authentication mechanisms such as [iprev](https://www.rfc-editor.org/rfc/rfc8601#section-2.7.3)
+and [SPF](https://www.rfc-editor.org/rfc/rfc7208) are also not taken into account.
+If there is no valid DKIM signature on the incoming email,
+the sender receives a "5.7.1 No valid DKIM signature found" error.
+
+Outgoing emails must be sent over authenticated connection
+with envelope MAIL FROM (return path) corresponding to the login.
+This is ensured by Postfix which maps login username
+to MAIL FROM with
+[`smtpd_sender_login_maps`](https://www.postfix.org/postconf.5.html#smtpd_sender_login_maps)
+and rejects incorrectly authenticated emails with [`reject_sender_login_mismatch`](reject_sender_login_mismatch) policy.
+`From:` header must correspond to envelope MAIL FROM,
+this is ensured by `filtermail` proxy.

chatmaild/MANIFEST.in

@@ -1,4 +1,3 @@
-include src/chatmaild/*.f 
 include src/chatmaild/ini/*.ini.f
 include src/chatmaild/ini/*.ini
 include src/chatmaild/tests/mail-data/*

chatmaild/pyproject.toml

@@ -10,6 +10,7 @@ dependencies = [
   "iniconfig",
   "deltachat-rpc-server",
   "deltachat-rpc-client",
+  "filelock",
   "requests",
 ]
 

chatmaild/src/chatmaild/chatmail-metadata.service.f

@@ -1,10 +0,0 @@
-[Unit]
-Description=Chatmail dict proxy for IMAP METADATA
-
-[Service]
-ExecStart={execpath} /run/dovecot/metadata.socket vmail {config_path} /home/vmail/metadata
-Restart=always
-RestartSec=30
-
-[Install]
-WantedBy=multi-user.target

chatmaild/src/chatmaild/doveauth.py

@@ -4,12 +4,12 @@ import time
 import sys
 import json
 import crypt
+from pathlib import Path
 from socketserver import (
     UnixStreamServer,
     StreamRequestHandler,
     ThreadingMixIn,
 )
-import pwd
 
 from .database import Database
 from .config import read_config, Config
@@ -46,23 +46,32 @@ def is_allowed_to_create(config: Config, user, cleartext_password) -> bool:
         return False
     localpart, domain = parts
 
+    if localpart == "echo":
+        # echobot account should not be created in the database
+        return False
+
     if (
         len(localpart) > config.username_max_length
         or len(localpart) < config.username_min_length
     ):
-        if localpart != "echo":
-            logging.warning(
-                "localpart %s has to be between %s and %s chars long",
-                localpart,
-                config.username_min_length,
-                config.username_max_length,
-            )
-            return False
+        logging.warning(
+            "localpart %s has to be between %s and %s chars long",
+            localpart,
+            config.username_min_length,
+            config.username_max_length,
+        )
 
     return True
 
 
 def get_user_data(db, config: Config, user):
+    if user == f"echo@{config.mail_domain}":
+        return dict(
+            home=f"/home/vmail/mail/{config.mail_domain}/echo@{config.mail_domain}",
+            uid="vmail",
+            gid="vmail",
+        )
+
     with db.read_connection() as conn:
         result = conn.get_user(user)
     if result:
@@ -77,6 +86,21 @@ def lookup_userdb(db, config: Config, user):
 
 
 def lookup_passdb(db, config: Config, user, cleartext_password):
+    if user == f"echo@{config.mail_domain}":
+        # Echobot writes password it wants to log in with into /run/echobot/password
+        try:
+            password = Path("/run/echobot/password").read_text()
+        except Exception:
+            logging.exception("Exception when trying to read /run/echobot/password")
+            return None
+
+        return dict(
+            home=f"/home/vmail/mail/{config.mail_domain}/echo@{config.mail_domain}",
+            uid="vmail",
+            gid="vmail",
+            password=encrypt_password(password),
+        )
+
     with db.write_transaction() as conn:
         userdata = conn.get_user(user)
         if userdata:
@@ -191,9 +215,8 @@ class ThreadedUnixStreamServer(ThreadingMixIn, UnixStreamServer):
 
 def main():
     socket = sys.argv[1]
-    passwd_entry = pwd.getpwnam(sys.argv[2])
-    db = Database(sys.argv[3])
-    config = read_config(sys.argv[4])
+    db = Database(sys.argv[2])
+    config = read_config(sys.argv[3])
 
     class Handler(StreamRequestHandler):
         def handle(self):
@@ -209,7 +232,6 @@ def main():
         pass
 
     with ThreadedUnixStreamServer(socket, Handler) as server:
-        os.chown(socket, uid=passwd_entry.pw_uid, gid=passwd_entry.pw_gid)
         try:
             server.serve_forever()
         except KeyboardInterrupt:

chatmaild/src/chatmaild/echo.py

@@ -3,14 +3,17 @@
 
 it will echo back any message that has non-empty text and also supports the /help command.
 """
+
 import logging
 import os
 import sys
+import subprocess
 
 from deltachat_rpc_client import Bot, DeltaChat, EventType, Rpc, events
+from pathlib import Path
 
-from chatmaild.newemail import create_newemail_dict
 from chatmaild.config import read_config
+from chatmaild.newemail import create_newemail_dict
 
 hooks = events.HookCollection()
 
@@ -75,9 +78,23 @@ def main():
         account = accounts[0] if accounts else deltachat.add_account()
 
         bot = Bot(account, hooks)
+
+        config = read_config(sys.argv[1])
+
+        # Create password file
+        if bot.is_configured():
+            password = bot.account.get_config("mail_pw")
+        else:
+            password = create_newemail_dict(config)["password"]
+        Path("/run/echobot/password").write_text(password)
+
+        # Give the user which doveauth runs as access to the password file.
+        subprocess.run(
+            ["/usr/bin/setfacl", "-m", "user:vmail:r", "/run/echobot/password"],
+            check=True,
+        )
+
         if not bot.is_configured():
-            config = read_config(sys.argv[1])
-            password = create_newemail_dict(config).get("password")
             email = "echo@" + config.mail_domain
             bot.configure(email, password)
         bot.run_forever()

chatmaild/src/chatmaild/echobot.service.f

@@ -1,11 +0,0 @@
-[Unit]
-Description=Chatmail echo bot for testing it works
-
-[Service]
-ExecStart={execpath} {config_path}
-Environment="PATH={remote_venv_dir}:$PATH"
-Restart=always
-RestartSec=30
-
-[Install]
-WantedBy=multi-user.target

chatmaild/src/chatmaild/filedict.py

@@ -0,0 +1,35 @@
+import os
+import logging
+import json
+import filelock
+from contextlib import contextmanager
+
+
+class FileDict:
+    """Concurrency-safe multi-reader/single-writer persistent dict."""
+
+    def __init__(self, path):
+        self.path = path
+        self.lock_path = path.with_name(path.name + ".lock")
+
+    @contextmanager
+    def modify(self):
+        # the OS will release the lock if the process dies,
+        # and the contextmanager will otherwise guarantee release
+        with filelock.FileLock(self.lock_path):
+            data = self.read()
+            yield data
+            write_path = self.path.with_name(self.path.name + ".tmp")
+            with write_path.open("w") as f:
+                json.dump(data, f)
+            os.rename(write_path, self.path)
+
+    def read(self):
+        try:
+            with self.path.open("r") as f:
+                return json.load(f)
+        except FileNotFoundError:
+            return {}
+        except Exception:
+            logging.warning("corrupt serialization state at: %r", self.path)
+            return {}

chatmaild/src/chatmaild/metadata.py

@@ -1,144 +1,118 @@
-import pwd
-
-import pathlib
-from queue import Queue
-from threading import Thread
+from pathlib import Path
 from socketserver import (
     UnixStreamServer,
     StreamRequestHandler,
     ThreadingMixIn,
 )
-from .config import read_config
 import sys
 import logging
 import os
-import requests
-import marshal
+
+from .filedict import FileDict
+from .notifier import Notifier
 
 
+DICTPROXY_HELLO_CHAR = "H"
 DICTPROXY_LOOKUP_CHAR = "L"
 DICTPROXY_ITERATE_CHAR = "I"
-DICTPROXY_SET_CHAR = "S"
 DICTPROXY_BEGIN_TRANSACTION_CHAR = "B"
+DICTPROXY_SET_CHAR = "S"
 DICTPROXY_COMMIT_TRANSACTION_CHAR = "C"
-DICTPROXY_TRANSACTION_CHARS = "SBC"
+DICTPROXY_TRANSACTION_CHARS = "BSC"
 
 
-class Notifier:
-    def __init__(self, metadata_dir):
-        self.metadata_dir = metadata_dir
-        self.to_notify_queue = Queue()
+class Metadata:
+    # each SETMETADATA on this key appends to a list of unique device tokens
+    # which only ever get removed if the upstream indicates the token is invalid
+    DEVICETOKEN_KEY = "devicetoken"
 
-    def get_metadata(self, guid):
-        guid_path = self.metadata_dir.joinpath(guid)
-        if guid_path.exists():
-            with guid_path.open("rb") as f:
-                return marshal.load(f)
-        return {}
+    def __init__(self, vmail_dir):
+        self.vmail_dir = vmail_dir
 
-    def set_metadata(self, guid, guid_data):
-        guid_path = self.metadata_dir.joinpath(guid)
-        write_path = guid_path.with_suffix(".tmp")
-        with write_path.open("wb") as f:
-            marshal.dump(guid_data, f)
-        os.rename(write_path, guid_path)
+    def get_metadata_dict(self, addr):
+        return FileDict(self.vmail_dir / addr / "metadata.json")
 
-    def set_token(self, guid, token):
-        guid_data = self.get_metadata(guid)
-        guid_data["token"] = token
-        self.set_metadata(guid, guid_data)
+    def add_token_to_addr(self, addr, token):
+        with self.get_metadata_dict(addr).modify() as data:
+            tokens = data.setdefault(self.DEVICETOKEN_KEY, [])
+            if token not in tokens:
+                tokens.append(token)
 
-    def del_token(self, guid):
-        guid_data = self.get_metadata(guid)
-        if "token" in guid_data:
-            del guid_data["token"]
-            self.set_metadata(guid, guid_data)
+    def remove_token_from_addr(self, addr, token):
+        with self.get_metadata_dict(addr).modify() as data:
+            tokens = data.get(self.DEVICETOKEN_KEY, [])
+            if token in tokens:
+                tokens.remove(token)
 
-    def get_token(self, guid):
-        return self.get_metadata(guid).get("token")
-
-    def new_message_for_guid(self, guid):
-        self.to_notify_queue.put(guid)
-
-    def thread_run_loop(self):
-        requests_session = requests.Session()
-        while 1:
-            self.thread_run_one(requests_session)
-
-    def thread_run_one(self, requests_session):
-        guid = self.to_notify_queue.get()
-        token = self.get_token(guid)
-        if token:
-            response = requests_session.post(
-                "https://notifications.delta.chat/notify",
-                data=token,
-                timeout=60,
-            )
-            if response.status_code == 410:
-                # 410 Gone status code
-                # means the token is no longer valid.
-                self.del_token(guid)
+    def get_tokens_for_addr(self, addr):
+        mdict = self.get_metadata_dict(addr).read()
+        return mdict.get(self.DEVICETOKEN_KEY, [])
 
 
-def handle_dovecot_protocol(rfile, wfile, notifier):
-    # HELLO message, ignored.
-    msg = rfile.readline().strip().decode()
-
+def handle_dovecot_protocol(rfile, wfile, notifier, metadata):
     transactions = {}
     while True:
         msg = rfile.readline().strip().decode()
         if not msg:
             break
 
-        res = handle_dovecot_request(msg, transactions, notifier)
+        res = handle_dovecot_request(msg, transactions, notifier, metadata)
         if res:
             wfile.write(res.encode("ascii"))
             wfile.flush()
 
 
-def handle_dovecot_request(msg, transactions, notifier):
+def handle_dovecot_request(msg, transactions, notifier, metadata):
     # see https://doc.dovecot.org/3.0/developer_manual/design/dict_protocol/
     short_command = msg[0]
     parts = msg[1:].split("\t")
     if short_command == DICTPROXY_LOOKUP_CHAR:
+        # Lpriv/43f5f508a7ea0366dff30200c15250e3/devicetoken\tlkj123poi@c2.testrun.org
+        keyparts = parts[0].split("/")
+        if keyparts[0] == "priv":
+            keyname = keyparts[2]
+            addr = parts[1]
+            if keyname == metadata.DEVICETOKEN_KEY:
+                res = " ".join(metadata.get_tokens_for_addr(addr))
+                return f"O{res}\n"
+        logging.warning("lookup ignored: %r", msg)
         return "N\n"
     elif short_command == DICTPROXY_ITERATE_CHAR:
         # Empty line means ITER_FINISHED.
         # If we don't return empty line Dovecot will timeout.
         return "\n"
+    elif short_command == DICTPROXY_HELLO_CHAR:
+        return  # no version checking
 
     if short_command not in (DICTPROXY_TRANSACTION_CHARS):
+        logging.warning("unknown dictproxy request: %r", msg)
         return
 
     transaction_id = parts[0]
 
     if short_command == DICTPROXY_BEGIN_TRANSACTION_CHAR:
-        transactions[transaction_id] = "O\n"
+        addr = parts[1]
+        transactions[transaction_id] = dict(addr=addr, res="O\n")
     elif short_command == DICTPROXY_COMMIT_TRANSACTION_CHAR:
-        # returns whether it failed or succeeded.
-        return transactions.pop(transaction_id, "N\n")
+        # each set devicetoken operation persists directly
+        # and does not wait until a "commit" comes
+        # because our dovecot config does not involve
+        # multiple set-operations in a single commit
+        return transactions.pop(transaction_id)["res"]
     elif short_command == DICTPROXY_SET_CHAR:
-        # See header of
-        # <https://github.com/dovecot/core/blob/5e7965632395793d9355eb906b173bf28d2a10ca/src/lib-storage/mailbox-attribute.h>
-        # for the documentation on the structure of the key.
-
-        # Request GETMETADATA "INBOX" /private/chatmail
-        # results in a query for
-        # priv/dd72550f05eadc65542a1200cac67ad7/chatmail
-        #
-        # Request GETMETADATA "" /private/chatmail
-        # results in
-        # priv/dd72550f05eadc65542a1200cac67ad7/vendor/vendor.dovecot/pvt/server/chatmail
+        # For documentation on key structure see
+        # https://github.com/dovecot/core/blob/main/src/lib-storage/mailbox-attribute.h
 
         keyname = parts[1].split("/")
         value = parts[2] if len(parts) > 2 else ""
-        if keyname[0] == "priv" and keyname[2] == "devicetoken":
-            notifier.set_token(keyname[1], value)
+        addr = transactions[transaction_id]["addr"]
+        if keyname[0] == "priv" and keyname[2] == metadata.DEVICETOKEN_KEY:
+            metadata.add_token_to_addr(addr, value)
         elif keyname[0] == "priv" and keyname[2] == "messagenew":
-            notifier.new_message_for_guid(keyname[1])
+            notifier.new_message_for_addr(addr, metadata)
         else:
             # Transaction failed.
-            transactions[transaction_id] = "F\n"
+            transactions[transaction_id]["res"] = "F\n"
 
 
 class ThreadedUnixStreamServer(ThreadingMixIn, UnixStreamServer):
@@ -146,22 +120,25 @@ class ThreadedUnixStreamServer(ThreadingMixIn, UnixStreamServer):
 
 
 def main():
-    socket, username, config, metadata_dir = sys.argv[1:]
-    passwd_entry = pwd.getpwnam(username)
+    socket, vmail_dir = sys.argv[1:]
 
-    # XXX config is not currently used
-    config = read_config(config)
-    metadata_dir = pathlib.Path(metadata_dir)
-    if not metadata_dir.exists():
-        metadata_dir.mkdir()
-    notifier = Notifier(metadata_dir)
+    vmail_dir = Path(vmail_dir)
+    if not vmail_dir.exists():
+        logging.error("vmail dir does not exist: %r", vmail_dir)
+        return 1
+
+    queue_dir = vmail_dir / "pending_notifications"
+    queue_dir.mkdir(exist_ok=True)
+    metadata = Metadata(vmail_dir)
+    notifier = Notifier(queue_dir)
+    notifier.start_notification_threads(metadata.remove_token_from_addr)
 
     class Handler(StreamRequestHandler):
         def handle(self):
             try:
-                handle_dovecot_protocol(self.rfile, self.wfile, notifier)
+                handle_dovecot_protocol(self.rfile, self.wfile, notifier, metadata)
             except Exception:
-                logging.exception("Exception in the handler")
+                logging.exception("Exception in the dovecot dictproxy handler")
                 raise
 
     try:
@@ -169,15 +146,7 @@ def main():
     except FileNotFoundError:
         pass
 
-    # start notifier thread for signalling new messages to
-    # Delta Chat notification server
-
-    t = Thread(target=notifier.thread_run_loop)
-    t.setDaemon(True)
-    t.start()
-
     with ThreadedUnixStreamServer(socket, Handler) as server:
-        os.chown(socket, uid=passwd_entry.pw_uid, gid=passwd_entry.pw_gid)
         try:
             server.serve_forever()
         except KeyboardInterrupt:

chatmaild/src/chatmaild/notifier.py

@@ -0,0 +1,165 @@
+"""
+This modules provides notification machinery for transmitting device tokens to
+a central notification server which in turn contacts a phone provider's notification server
+to trigger Delta Chat apps to retrieve messages and provide instant notifications to users.
+
+The Notifier class arranges the queuing of tokens in separate PriorityQueues
+from which NotifyThreads take and transmit them via HTTPS
+to the `notifications.delta.chat` service.
+The current lack of proper HTTP/2-support in Python leads us
+to use multiple threads and connections to the Rust-implemented `notifications.delta.chat`
+which itself uses HTTP/2 and thus only a single connection to phone-notification providers.
+
+If a token fails to cause a successful notification
+it is moved to a retry-number specific PriorityQueue
+which handles all tokens that failed a particular number of times
+and which are scheduled for retry using exponential back-off timing.
+If a token notification would be scheduled more than DROP_DEADLINE seconds
+after its first attempt, it is dropped with a log error.
+
+Note that tokens are completely opaque to the notification machinery here
+and will in the future be encrypted foreclosing all ability to distinguish
+which device token ultimately goes to which phone-provider notification service,
+or to understand the relation of "device tokens" and chatmail addresses.
+The meaning and format of tokens is basically a matter of Delta-Chat Core and
+the `notification.delta.chat` service.
+"""
+
+import os
+import time
+import math
+import logging
+from uuid import uuid4
+from threading import Thread
+from pathlib import Path
+from queue import PriorityQueue
+from dataclasses import dataclass
+import requests
+
+
+@dataclass
+class PersistentQueueItem:
+    path: Path
+    addr: str
+    start_ts: int
+    token: str
+
+    def delete(self):
+        self.path.unlink(missing_ok=True)
+
+    @classmethod
+    def create(cls, queue_dir, addr, start_ts, token):
+        queue_id = uuid4().hex
+        start_ts = int(start_ts)
+        path = queue_dir.joinpath(queue_id)
+        tmp_path = path.with_name(path.name + ".tmp")
+        tmp_path.write_text(f"{addr}\n{start_ts}\n{token}")
+        os.rename(tmp_path, path)
+        return cls(path, addr, start_ts, token)
+
+    @classmethod
+    def read_from_path(cls, path):
+        addr, start_ts, token = path.read_text().split("\n", maxsplit=2)
+        return cls(path, addr, int(start_ts), token)
+
+    def __lt__(self, other):
+        return self.start_ts < other.start_ts
+
+
+class Notifier:
+    URL = "https://notifications.delta.chat/notify"
+    CONNECTION_TIMEOUT = 60.0  # seconds until http-request is given up
+    BASE_DELAY = 8.0  # base seconds for exponential back-off delay
+    DROP_DEADLINE = 5 * 60 * 60  #  drop notifications after 5 hours
+
+    def __init__(self, queue_dir):
+        self.queue_dir = queue_dir
+        max_tries = int(math.log(self.DROP_DEADLINE, self.BASE_DELAY)) + 1
+        self.retry_queues = [PriorityQueue() for _ in range(max_tries)]
+
+    def compute_delay(self, retry_num):
+        return 0 if retry_num == 0 else pow(self.BASE_DELAY, retry_num)
+
+    def new_message_for_addr(self, addr, metadata):
+        start_ts = int(time.time())
+        for token in metadata.get_tokens_for_addr(addr):
+            queue_item = PersistentQueueItem.create(
+                self.queue_dir, addr, start_ts, token
+            )
+            self.queue_for_retry(queue_item)
+
+    def requeue_persistent_queue_items(self):
+        for queue_path in self.queue_dir.iterdir():
+            if queue_path.name.endswith(".tmp"):
+                logging.warning("removing spurious queue item: %r", queue_path)
+                queue_path.unlink()
+                continue
+            queue_item = PersistentQueueItem.read_from_path(queue_path)
+            self.queue_for_retry(queue_item)
+
+    def queue_for_retry(self, queue_item, retry_num=0):
+        delay = self.compute_delay(retry_num)
+        when = int(time.time()) + delay
+        deadline = queue_item.start_ts + self.DROP_DEADLINE
+        if retry_num >= len(self.retry_queues) or when > deadline:
+            queue_item.delete()
+            logging.error("notification exceeded deadline: %r", queue_item.token)
+            return
+
+        self.retry_queues[retry_num].put((when, queue_item))
+
+    def start_notification_threads(self, remove_token_from_addr):
+        self.requeue_persistent_queue_items()
+        threads = {}
+        for retry_num in range(len(self.retry_queues)):
+            # use 4 threads for first-try tokens and less for subsequent tries
+            num_threads = 4 if retry_num == 0 else 2
+            threads[retry_num] = []
+            for _ in range(num_threads):
+                thread = NotifyThread(self, retry_num, remove_token_from_addr)
+                threads[retry_num].append(thread)
+                thread.start()
+        return threads
+
+
+class NotifyThread(Thread):
+    def __init__(self, notifier, retry_num, remove_token_from_addr):
+        super().__init__(daemon=True)
+        self.notifier = notifier
+        self.retry_num = retry_num
+        self.remove_token_from_addr = remove_token_from_addr
+
+    def stop(self):
+        self.notifier.retry_queues[self.retry_num].put((None, None))
+
+    def run(self):
+        requests_session = requests.Session()
+        while self.retry_one(requests_session):
+            pass
+
+    def retry_one(self, requests_session, sleep=time.sleep):
+        when, queue_item = self.notifier.retry_queues[self.retry_num].get()
+        if when is None:
+            return False
+        wait_time = when - int(time.time())
+        if wait_time > 0:
+            sleep(wait_time)
+        self.perform_request_to_notification_server(requests_session, queue_item)
+        return True
+
+    def perform_request_to_notification_server(self, requests_session, queue_item):
+        timeout = self.notifier.CONNECTION_TIMEOUT
+        token = queue_item.token
+        try:
+            res = requests_session.post(self.notifier.URL, data=token, timeout=timeout)
+        except requests.exceptions.RequestException as e:
+            res = e
+        else:
+            if res.status_code in (200, 410):
+                if res.status_code == 410:
+                    self.remove_token_from_addr(queue_item.addr, token)
+                queue_item.delete()
+                return
+
+        logging.warning("Notification request failed: %r", res)
+        self.notifier.queue_for_retry(queue_item, retry_num=self.retry_num + 1)

chatmaild/src/chatmaild/tests/test_filedict.py

@@ -0,0 +1,19 @@
+from chatmaild.filedict import FileDict
+
+
+def test_basic(tmp_path):
+    fdict = FileDict(tmp_path.joinpath("metadata"))
+    assert fdict.read() == {}
+    with fdict.modify() as d:
+        d["devicetoken"] = [1, 2, 3]
+        d["456"] = 4.2
+    new = fdict.read()
+    assert new["devicetoken"] == [1, 2, 3]
+    assert new["456"] == 4.2
+
+
+def test_bad_marshal_file(tmp_path, caplog):
+    fdict1 = FileDict(tmp_path.joinpath("metadata"))
+    fdict1.path.write_bytes(b"l12k3l12k3l")
+    assert fdict1.read() == {}
+    assert "corrupt" in caplog.records[0].msg

chatmaild/src/chatmaild/tests/test_metadata.py

@@ -1,96 +1,179 @@
 import io
 import pytest
+import requests
+import time
 
 from chatmaild.metadata import (
     handle_dovecot_request,
     handle_dovecot_protocol,
+    Metadata,
+)
+from chatmaild.notifier import (
     Notifier,
+    NotifyThread,
+    PersistentQueueItem,
 )
 
 
 @pytest.fixture
-def notifier(tmp_path):
-    metadata_dir = tmp_path.joinpath("metadata")
-    metadata_dir.mkdir()
-    return Notifier(metadata_dir)
+def notifier(metadata):
+    queue_dir = metadata.vmail_dir.joinpath("pending_notifications")
+    queue_dir.mkdir()
+    return Notifier(queue_dir)
 
 
-def test_notifier_persistence(tmp_path):
-    metadata_dir = tmp_path.joinpath("metadata")
-    metadata_dir.mkdir()
-    notifier1 = Notifier(metadata_dir)
-    notifier2 = Notifier(metadata_dir)
-    assert notifier1.get_token(guid="guid00") is None
-    assert notifier2.get_token(guid="guid00") is None
-
-    notifier1.set_token("guid00", "01234")
-    notifier1.set_token("guid03", "456")
-    assert notifier2.get_token("guid00") == "01234"
-    assert notifier2.get_token("guid03") == "456"
-    notifier2.del_token("guid00")
-    assert notifier1.get_token("guid00") is None
+@pytest.fixture
+def metadata(tmp_path):
+    vmail_dir = tmp_path.joinpath("vmaildir")
+    vmail_dir.mkdir()
+    return Metadata(vmail_dir)
 
 
-def test_handle_dovecot_request_lookup_fails(notifier):
-    res = handle_dovecot_request("Lpriv/123/chatmail", {}, notifier)
+@pytest.fixture
+def testaddr():
+    return "user.name@example.org"
+
+
+@pytest.fixture
+def testaddr2():
+    return "user2@example.org"
+
+
+@pytest.fixture
+def token():
+    return "01234"
+
+
+def get_mocked_requests(statuslist):
+    class ReqMock:
+        requests = []
+
+        def post(self, url, data, timeout):
+            self.requests.append((url, data, timeout))
+            res = statuslist.pop(0)
+            if isinstance(res, Exception):
+                raise res
+
+            class Result:
+                status_code = res
+
+            return Result()
+
+    return ReqMock()
+
+
+def test_metadata_persistence(tmp_path, testaddr, testaddr2):
+    metadata1 = Metadata(tmp_path)
+    metadata2 = Metadata(tmp_path)
+    assert not metadata1.get_tokens_for_addr(testaddr)
+    assert not metadata2.get_tokens_for_addr(testaddr)
+
+    metadata1.add_token_to_addr(testaddr, "01234")
+    metadata1.add_token_to_addr(testaddr2, "456")
+    assert metadata2.get_tokens_for_addr(testaddr) == ["01234"]
+    assert metadata2.get_tokens_for_addr(testaddr2) == ["456"]
+    metadata2.remove_token_from_addr(testaddr, "01234")
+    assert not metadata1.get_tokens_for_addr(testaddr)
+    assert metadata1.get_tokens_for_addr(testaddr2) == ["456"]
+
+
+def test_remove_nonexisting(metadata, tmp_path, testaddr):
+    metadata.add_token_to_addr(testaddr, "123")
+    metadata.remove_token_from_addr(testaddr, "1l23k1l2k3")
+    assert metadata.get_tokens_for_addr(testaddr) == ["123"]
+
+
+def test_notifier_remove_without_set(metadata, testaddr):
+    metadata.remove_token_from_addr(testaddr, "123")
+    assert not metadata.get_tokens_for_addr(testaddr)
+
+
+def test_handle_dovecot_request_lookup_fails(notifier, metadata, testaddr):
+    res = handle_dovecot_request(
+        f"Lpriv/123/chatmail\t{testaddr}", {}, notifier, metadata
+    )
     assert res == "N\n"
 
 
-def test_handle_dovecot_request_happy_path(notifier):
+def test_handle_dovecot_request_happy_path(notifier, metadata, testaddr, token):
     transactions = {}
 
-    # lookups return the same NOTFOUND result
-    res = handle_dovecot_request("Lpriv/123/chatmail", transactions, notifier)
-    assert res == "N\n"
-    assert notifier.get_token("guid00") is None and not transactions
-
     # set device token in a transaction
     tx = "1111"
-    msg = f"B{tx}\tuser"
-    res = handle_dovecot_request(msg, transactions, notifier)
-    assert not res and notifier.get_token("guid00") is None
-    assert transactions == {tx: "O\n"}
+    msg = f"B{tx}\t{testaddr}"
+    res = handle_dovecot_request(msg, transactions, notifier, metadata)
+    assert not res and not metadata.get_tokens_for_addr(testaddr)
+    assert transactions == {tx: dict(addr=testaddr, res="O\n")}
 
-    msg = f"S{tx}\tpriv/guid00/devicetoken\t01234"
-    res = handle_dovecot_request(msg, transactions, notifier)
+    msg = f"S{tx}\tpriv/guid00/devicetoken\t{token}"
+    res = handle_dovecot_request(msg, transactions, notifier, metadata)
     assert not res
     assert len(transactions) == 1
-    assert notifier.get_token("guid00") == "01234"
+    assert metadata.get_tokens_for_addr(testaddr) == [token]
 
     msg = f"C{tx}"
-    res = handle_dovecot_request(msg, transactions, notifier)
+    res = handle_dovecot_request(msg, transactions, notifier, metadata)
     assert res == "O\n"
     assert len(transactions) == 0
-    assert notifier.get_token("guid00") == "01234"
+    assert metadata.get_tokens_for_addr(testaddr) == [token]
 
     # trigger notification for incoming message
-    assert handle_dovecot_request(f"B{tx}\tuser", transactions, notifier) is None
-    msg = f"S{tx}\tpriv/guid00/messagenew"
-    assert handle_dovecot_request(msg, transactions, notifier) is None
-    assert notifier.to_notify_queue.get() == "guid00"
-    assert notifier.to_notify_queue.qsize() == 0
-    assert handle_dovecot_request(f"C{tx}\tuser", transactions, notifier) == "O\n"
+    tx2 = "2222"
+    assert (
+        handle_dovecot_request(f"B{tx2}\t{testaddr}", transactions, notifier, metadata)
+        is None
+    )
+    msg = f"S{tx2}\tpriv/guid00/messagenew"
+    assert handle_dovecot_request(msg, transactions, notifier, metadata) is None
+    queue_item = notifier.retry_queues[0].get()[1]
+    assert queue_item.token == token
+    assert handle_dovecot_request(f"C{tx2}", transactions, notifier, metadata) == "O\n"
     assert not transactions
+    assert queue_item.path.exists()
 
 
-def test_handle_dovecot_protocol_set_devicetoken(notifier):
+def test_handle_dovecot_protocol_set_devicetoken(metadata, notifier):
     rfile = io.BytesIO(
         b"\n".join(
             [
                 b"HELLO",
-                b"Btx00\tuser",
+                b"Btx00\tuser@example.org",
                 b"Stx00\tpriv/guid00/devicetoken\t01234",
                 b"Ctx00",
             ]
         )
     )
     wfile = io.BytesIO()
-    handle_dovecot_protocol(rfile, wfile, notifier)
-    assert notifier.get_token("guid00") == "01234"
+    handle_dovecot_protocol(rfile, wfile, notifier, metadata)
+    assert wfile.getvalue() == b"O\n"
+    assert metadata.get_tokens_for_addr("user@example.org") == ["01234"]
+
+
+def test_handle_dovecot_protocol_set_get_devicetoken(metadata, notifier):
+    rfile = io.BytesIO(
+        b"\n".join(
+            [
+                b"HELLO",
+                b"Btx00\tuser@example.org",
+                b"Stx00\tpriv/guid00/devicetoken\t01234",
+                b"Ctx00",
+            ]
+        )
+    )
+    wfile = io.BytesIO()
+    handle_dovecot_protocol(rfile, wfile, notifier, metadata)
+    assert metadata.get_tokens_for_addr("user@example.org") == ["01234"]
     assert wfile.getvalue() == b"O\n"
 
+    rfile = io.BytesIO(
+        b"\n".join([b"HELLO", b"Lpriv/0123/devicetoken\tuser@example.org"])
+    )
+    wfile = io.BytesIO()
+    handle_dovecot_protocol(rfile, wfile, notifier, metadata)
+    assert wfile.getvalue() == b"O01234\n"
 
-def test_handle_dovecot_protocol_iterate(notifier):
+
+def test_handle_dovecot_protocol_iterate(metadata, notifier):
     rfile = io.BytesIO(
         b"\n".join(
             [
@@ -100,64 +183,116 @@ def test_handle_dovecot_protocol_iterate(notifier):
         )
     )
     wfile = io.BytesIO()
-    handle_dovecot_protocol(rfile, wfile, notifier)
+    handle_dovecot_protocol(rfile, wfile, notifier, metadata)
     assert wfile.getvalue() == b"\n"
 
 
-def test_handle_dovecot_protocol_messagenew(notifier):
-    rfile = io.BytesIO(
-        b"\n".join(
-            [
-                b"HELLO",
-                b"Btx01\tuser",
-                b"Stx01\tpriv/guid00/messagenew",
-                b"Ctx01",
-            ]
-        )
-    )
-    wfile = io.BytesIO()
-    handle_dovecot_protocol(rfile, wfile, notifier)
-    assert wfile.getvalue() == b"O\n"
-    assert notifier.to_notify_queue.get() == "guid00"
-    assert notifier.to_notify_queue.qsize() == 0
-
-
-def test_notifier_thread_run(notifier):
-    requests = []
-
-    class ReqMock:
-        def post(self, url, data, timeout):
-            requests.append((url, data, timeout))
-
-            class Result:
-                status_code = 200
-
-            return Result()
-
-    notifier.set_token("guid00", "01234")
-    notifier.new_message_for_guid("guid00")
-    notifier.thread_run_one(ReqMock())
-    url, data, timeout = requests[0]
+def test_notifier_thread_deletes_persistent_file(metadata, notifier, testaddr):
+    reqmock = get_mocked_requests([200])
+    metadata.add_token_to_addr(testaddr, "01234")
+    notifier.new_message_for_addr(testaddr, metadata)
+    NotifyThread(notifier, 0, None).retry_one(reqmock)
+    url, data, timeout = reqmock.requests[0]
     assert data == "01234"
-    assert notifier.get_token("guid00") == "01234"
+    assert metadata.get_tokens_for_addr(testaddr) == ["01234"]
+    notifier.requeue_persistent_queue_items()
+    assert notifier.retry_queues[0].qsize() == 0
 
 
-def test_notifier_thread_run_gone_removes_token(notifier):
-    requests = []
+@pytest.mark.parametrize("status", [requests.exceptions.RequestException(), 404, 500])
+def test_notifier_thread_connection_failures(
+    metadata, notifier, testaddr, status, caplog
+):
+    """test that tokens keep getting retried until they are given up."""
+    metadata.add_token_to_addr(testaddr, "01234")
+    notifier.new_message_for_addr(testaddr, metadata)
+    notifier.NOTIFICATION_RETRY_DELAY = 5
+    max_tries = len(notifier.retry_queues)
+    for i in range(max_tries):
+        caplog.clear()
+        reqmock = get_mocked_requests([status])
+        sleep_calls = []
+        NotifyThread(notifier, i, None).retry_one(reqmock, sleep=sleep_calls.append)
+        assert notifier.retry_queues[i].qsize() == 0
+        assert "request failed" in caplog.records[0].msg
+        if i > 0:
+            assert len(sleep_calls) == 1
+        if i + 1 < max_tries:
+            assert notifier.retry_queues[i + 1].qsize() == 1
+            assert len(caplog.records) == 1
+        else:
+            assert len(caplog.records) == 2
+            assert "deadline" in caplog.records[1].msg
+    notifier.requeue_persistent_queue_items()
+    assert notifier.retry_queues[0].qsize() == 0
 
-    class ReqMock:
-        def post(self, url, data, timeout):
-            requests.append((url, data, timeout))
 
-            class Result:
-                status_code = 410
+def test_requeue_removes_tmp_files(notifier, metadata, testaddr, caplog):
+    metadata.add_token_to_addr(testaddr, "01234")
+    notifier.new_message_for_addr(testaddr, metadata)
+    p = notifier.queue_dir.joinpath("1203981203.tmp")
+    p.touch()
+    notifier2 = notifier.__class__(notifier.queue_dir)
+    notifier2.requeue_persistent_queue_items()
+    assert "spurious" in caplog.records[0].msg
+    assert not p.exists()
+    assert notifier2.retry_queues[0].qsize() == 1
+    when, queue_item = notifier2.retry_queues[0].get()
+    assert when <= int(time.time())
+    assert queue_item.addr == testaddr
 
-            return Result()
 
-    notifier.set_token("guid00", "01234")
-    notifier.new_message_for_guid("guid00")
-    assert notifier.get_token("guid00") == "01234"
-    notifier.thread_run_one(ReqMock())
-    url, data, timeout = requests[0]
+def test_start_and_stop_notification_threads(notifier, testaddr):
+    threads = notifier.start_notification_threads(None)
+    for retry_num, threadlist in threads.items():
+        for t in threadlist:
+            t.stop()
+            t.join()
+
+
+def test_multi_device_notifier(metadata, notifier, testaddr):
+    metadata.add_token_to_addr(testaddr, "01234")
+    metadata.add_token_to_addr(testaddr, "56789")
+    notifier.new_message_for_addr(testaddr, metadata)
+    reqmock = get_mocked_requests([200, 200])
+    NotifyThread(notifier, 0, None).retry_one(reqmock)
+    NotifyThread(notifier, 0, None).retry_one(reqmock)
+    assert notifier.retry_queues[0].qsize() == 0
+    assert notifier.retry_queues[1].qsize() == 0
+    url, data, timeout = reqmock.requests[0]
     assert data == "01234"
-    assert notifier.get_token("guid00") is None
+    url, data, timeout = reqmock.requests[1]
+    assert data == "56789"
+    assert metadata.get_tokens_for_addr(testaddr) == ["01234", "56789"]
+
+
+def test_notifier_thread_run_gone_removes_token(metadata, notifier, testaddr):
+    metadata.add_token_to_addr(testaddr, "01234")
+    metadata.add_token_to_addr(testaddr, "45678")
+    notifier.new_message_for_addr(testaddr, metadata)
+
+    reqmock = get_mocked_requests([410, 200])
+    NotifyThread(notifier, 0, metadata.remove_token_from_addr).retry_one(reqmock)
+    NotifyThread(notifier, 0, None).retry_one(reqmock)
+    url, data, timeout = reqmock.requests[0]
+    assert data == "01234"
+    url, data, timeout = reqmock.requests[1]
+    assert data == "45678"
+    assert metadata.get_tokens_for_addr(testaddr) == ["45678"]
+    assert notifier.retry_queues[0].qsize() == 0
+    assert notifier.retry_queues[1].qsize() == 0
+
+
+def test_persistent_queue_items(tmp_path, testaddr, token):
+    queue_item = PersistentQueueItem.create(tmp_path, testaddr, 432, token)
+    assert queue_item.addr == testaddr
+    assert queue_item.start_ts == 432
+    assert queue_item.token == token
+    item2 = PersistentQueueItem.read_from_path(queue_item.path)
+    assert item2.addr == testaddr
+    assert item2.start_ts == 432
+    assert item2.token == token
+    assert item2 == queue_item
+    item2.delete()
+    assert not item2.path.exists()
+    assert not queue_item < item2 and not item2 < queue_item

cmdeploy/pyproject.toml

@@ -19,6 +19,7 @@ dependencies = [
   "black",
   "pytest",
   "pytest-xdist", 
+  "imap_tools",
 ]
 
 [project.scripts]

cmdeploy/src/cmdeploy/__init__.py

@@ -108,8 +108,11 @@ def _install_remote_venv_with_chatmaild(config) -> None:
             execpath=f"{remote_venv_dir}/bin/{fn}",
             config_path=remote_chatmail_inipath,
             remote_venv_dir=remote_venv_dir,
+            mail_domain=config.mail_domain,
+        )
+        source_path = importlib.resources.files(__package__).joinpath(
+            "service", f"{fn}.service.f"
         )
-        source_path = importlib.resources.files("chatmaild").joinpath(f"{fn}.service.f")
         content = source_path.read_text().format(**params).encode()
 
         files.put(
@@ -132,20 +135,6 @@ def _configure_opendkim(domain: str, dkim_selector: str = "dkim") -> bool:
     """Configures OpenDKIM"""
     need_restart = False
 
-    server.group(name="Create opendkim group", group="opendkim", system=True)
-    server.user(
-        name="Create opendkim user",
-        user="opendkim",
-        groups=["opendkim"],
-        system=True,
-    )
-    server.user(
-        name="Add postfix user to opendkim group for socket access",
-        user="postfix",
-        groups=["opendkim"],
-        system=True,
-    )
-
     main_config = files.template(
         src=importlib.resources.files(__package__).joinpath("opendkim/opendkim.conf"),
         dest="/etc/opendkim.conf",
@@ -473,9 +462,47 @@ def deploy_chatmail(config_path: Path) -> None:
 
     from .www import build_webpages
 
-    apt.update(name="apt update", cache_time=24 * 3600)
     server.group(name="Create vmail group", group="vmail", system=True)
     server.user(name="Create vmail user", user="vmail", group="vmail", system=True)
+    server.group(name="Create opendkim group", group="opendkim", system=True)
+    server.user(
+        name="Create opendkim user",
+        user="opendkim",
+        groups=["opendkim"],
+        system=True,
+    )
+    server.user(
+        name="Add postfix user to opendkim group for socket access",
+        user="postfix",
+        groups=["opendkim"],
+        system=True,
+    )
+    server.user(name="Create echobot user", user="echobot", system=True)
+
+    server.shell(
+        name="Fix file owner in /home/vmail",
+        commands=["test -d /home/vmail && chown -R vmail:vmail /home/vmail"],
+    )
+
+    # Add our OBS repository for dovecot_no_delay
+    files.put(
+        name = "Add Deltachat OBS GPG key to apt keyring",
+        src = importlib.resources.files(__package__).joinpath("obs-home-deltachat.gpg"),
+        dest = "/etc/apt/keyrings/obs-home-deltachat.gpg",
+        user="root",
+        group="root",
+        mode="644",
+    )
+
+    files.line(
+        name = "Add DeltaChat OBS home repository to sources.list",
+        path = "/etc/apt/sources.list",
+        line = "deb [signed-by=/etc/apt/keyrings/obs-home-deltachat.gpg] https://download.opensuse.org/repositories/home:/deltachat/Debian_12/ ./",
+        ensure_newline = True,
+    )
+
+    apt.update(name="apt update", cache_time=24 * 3600)
+
     apt.packages(
         name="Install rsync",
         packages=["rsync"],
@@ -504,7 +531,6 @@ def deploy_chatmail(config_path: Path) -> None:
 
     # Deploy acmetool to have TLS certificates.
     deploy_acmetool(
-        nginx_hook=True,
         domains=[mail_domain, f"mta-sts.{mail_domain}", f"www.{mail_domain}"],
     )
 
@@ -562,14 +588,9 @@ def deploy_chatmail(config_path: Path) -> None:
         restarted=mta_sts_need_restart,
     )
 
-    systemd.service(
-        name="Start and enable Postfix",
-        service="postfix.service",
-        running=True,
-        enabled=True,
-        restarted=postfix_need_restart,
-    )
-
+    # Dovecot should be started before Postfix
+    # because it creates authentication socket
+    # required by Postfix.
     systemd.service(
         name="Start and enable Dovecot",
         service="dovecot.service",
@@ -578,6 +599,14 @@ def deploy_chatmail(config_path: Path) -> None:
         restarted=dovecot_need_restart,
     )
 
+    systemd.service(
+        name="Start and enable Postfix",
+        service="postfix.service",
+        running=True,
+        enabled=True,
+        restarted=postfix_need_restart,
+    )
+
     systemd.service(
         name="Start and enable nginx",
         service="nginx.service",

cmdeploy/src/cmdeploy/acmetool/__init__.py

@@ -5,7 +5,7 @@ from pyinfra import host
 from pyinfra.facts.systemd import SystemdStatus
 
 
-def deploy_acmetool(nginx_hook=False, email="", domains=[]):
+def deploy_acmetool(email="", domains=[]):
     """Deploy acmetool."""
     apt.packages(
         name="Install acmetool",
@@ -20,16 +20,13 @@ def deploy_acmetool(nginx_hook=False, email="", domains=[]):
         mode="644",
     )
 
-    if nginx_hook:
-        files.put(
-            src=importlib.resources.files(__package__)
-            .joinpath("acmetool.hook")
-            .open("rb"),
-            dest="/usr/lib/acme/hooks/nginx",
-            user="root",
-            group="root",
-            mode="744",
-        )
+    files.put(
+        src=importlib.resources.files(__package__).joinpath("acmetool.hook").open("rb"),
+        dest="/usr/lib/acme/hooks/nginx",
+        user="root",
+        group="root",
+        mode="744",
+    )
 
     files.template(
         src=importlib.resources.files(__package__).joinpath("response-file.yaml.j2"),
@@ -74,5 +71,5 @@ def deploy_acmetool(nginx_hook=False, email="", domains=[]):
 
     server.shell(
         name=f"Request certificate for: { ', '.join(domains) }",
-        commands=[f"acmetool want { ' '.join(domains)}"],
+        commands=[f"acmetool want --xlog.severity=debug { ' '.join(domains)}"],
     )

cmdeploy/src/cmdeploy/acmetool/acmetool.hook

@@ -3,3 +3,5 @@ set -e
 EVENT_NAME="$1"
 [ "$EVENT_NAME" = "live-updated" ] || exit 42
 systemctl restart nginx.service
+systemctl reload dovecot.service
+systemctl reload postfix.service

cmdeploy/src/cmdeploy/acmetool/response-file.yaml.j2

@@ -1,2 +1,2 @@
 "acme-enter-email": "{{ email }}"
-"acme-agreement:https://letsencrypt.org/documents/LE-SA-v1.3-September-21-2022.pdf": true
+"acme-agreement:https://letsencrypt.org/documents/LE-SA-v1.4-April-3-2024.pdf": true

cmdeploy/src/cmdeploy/dns.py

@@ -11,6 +11,11 @@ class DNS:
         self.session = requests.Session()
         self.out = out
         self.ssh = f"ssh root@{mail_domain} -- "
+        self.out.shell_output(
+            f"{ self.ssh }'apt-get update && apt-get install -y dnsutils'",
+            timeout=60,
+            no_print=True,
+        )
         try:
             self.shell(f"unbound-control flush_zone {mail_domain}")
         except subprocess.CalledProcessError:

cmdeploy/src/cmdeploy/dovecot/auth.conf

@@ -1,4 +1,4 @@
-uri = proxy:/run/dovecot/doveauth.socket:auth
+uri = proxy:/run/doveauth/doveauth.socket:auth
 iterate_disable = yes
 default_pass_scheme = plain
 # %E escapes characters " (double quote), ' (single quote) and \ (backslash) with \ (backslash).

cmdeploy/src/cmdeploy/dovecot/dovecot.conf.j2

@@ -27,7 +27,7 @@ mail_plugins = quota
 # these are the capabilities Delta Chat cares about actually 
 # so let's keep the network overhead per login small
 # https://github.com/deltachat/deltachat-core-rust/blob/master/src/imap/capabilities.rs
-imap_capability = IMAP4rev1 IDLE MOVE QUOTA CONDSTORE NOTIFY METADATA XDELTAPUSH
+imap_capability = IMAP4rev1 IDLE MOVE QUOTA CONDSTORE NOTIFY METADATA XDELTAPUSH XCHATMAIL
 
 
 # Authentication for system users.
@@ -78,7 +78,7 @@ mail_privileged_group = vmail
 ##
 
 # Pass all IMAP METADATA requests to the server implementing Dovecot's dict protocol.
-mail_attribute_dict = proxy:/run/dovecot/metadata.socket:metadata
+mail_attribute_dict = proxy:/run/chatmail-metadata/metadata.socket:metadata
 
 # Enable IMAP COMPRESS (RFC 4978).
 # <https://datatracker.ietf.org/doc/html/rfc4978.html>

cmdeploy/src/cmdeploy/service/chatmail-metadata.service.f

@@ -0,0 +1,12 @@
+[Unit]
+Description=Chatmail dict proxy for IMAP METADATA
+
+[Service]
+ExecStart={execpath} /run/chatmail-metadata/metadata.socket /home/vmail/mail/{mail_domain}
+Restart=always
+RestartSec=30
+User=vmail
+RuntimeDirectory=chatmail-metadata
+
+[Install]
+WantedBy=multi-user.target

cmdeploy/src/cmdeploy/service/doveauth.service.f

@@ -2,9 +2,11 @@
 Description=Chatmail dict authentication proxy for dovecot
 
 [Service]
-ExecStart={execpath} /run/dovecot/doveauth.socket vmail /home/vmail/passdb.sqlite {config_path}
+ExecStart={execpath} /run/doveauth/doveauth.socket /home/vmail/passdb.sqlite {config_path}
 Restart=always
 RestartSec=30
+User=vmail
+RuntimeDirectory=doveauth
 
 [Install]
 WantedBy=multi-user.target

cmdeploy/src/cmdeploy/service/echobot.service.f

@@ -0,0 +1,67 @@
+[Unit]
+Description=Chatmail echo bot for testing it works
+
+[Service]
+ExecStart={execpath} {config_path}
+Environment="PATH={remote_venv_dir}:$PATH"
+Restart=always
+RestartSec=30
+
+User=echobot
+Group=echobot
+
+# Create /var/lib/echobot
+StateDirectory=echobot
+
+# Create /run/echobot
+#
+# echobot stores /run/echobot/password
+# with a password there, which doveauth then reads.
+RuntimeDirectory=echobot
+
+WorkingDirectory=/var/lib/echobot
+
+# Apply security restrictions suggested by
+#   systemd-analyze security echobot.service
+CapabilityBoundingSet=
+LockPersonality=true
+MemoryDenyWriteExecute=true
+NoNewPrivileges=true
+PrivateDevices=true
+PrivateMounts=true
+PrivateTmp=true
+
+# We need to know about doveauth user to give it access to /run/echobot/password
+PrivateUsers=false
+
+ProtectClock=true
+ProtectControlGroups=true
+ProtectHostname=true
+ProtectKernelLogs=true
+ProtectKernelModules=true
+ProtectKernelTunables=true
+ProtectProc=noaccess
+
+# Should be "strict", but we currently write /accounts folder in a protected path
+ProtectSystem=full
+
+RemoveIPC=true
+RestrictAddressFamilies=AF_INET AF_INET6
+RestrictNamespaces=true
+RestrictRealtime=true
+RestrictSUIDSGID=true
+SystemCallArchitectures=native
+SystemCallFilter=~@clock
+SystemCallFilter=~@cpu-emulation
+SystemCallFilter=~@debug
+SystemCallFilter=~@module
+SystemCallFilter=~@mount
+SystemCallFilter=~@obsolete
+SystemCallFilter=~@raw-io
+SystemCallFilter=~@reboot
+SystemCallFilter=~@resources
+SystemCallFilter=~@swap
+UMask=0077
+
+[Install]
+WantedBy=multi-user.target

cmdeploy/src/cmdeploy/service/filtermail.service.f

@@ -1,5 +1,5 @@
 [Unit]
-Description=Chatmail Postfix BeforeQeue filter 
+Description=Chatmail Postfix before queue filter
 
 [Service]
 ExecStart={execpath} {config_path}

cmdeploy/src/cmdeploy/tests/online/test_0_login.py

@@ -14,6 +14,13 @@ def test_init(tmp_path, maildomain):
     assert config.mail_domain == maildomain
 
 
+def test_capabilities(imap):
+    imap.connect()
+    capas = imap.conn.capabilities
+    assert "XCHATMAIL" in capas
+    assert "XDELTAPUSH" in capas
+
+
 def test_login_basic_functioning(imap_or_smtp, gencreds, lp):
     """Test a) that an initial login creates a user automatically
     and b) verify we can also login a second time with the same password

cmdeploy/src/cmdeploy/tests/online/test_2_deltachat.py

@@ -5,6 +5,46 @@ import random
 import pytest
 import requests
 import ipaddress
+import imap_tools
+
+
+@pytest.fixture
+def imap_mailbox(cmfactory):
+    (ac1,) = cmfactory.get_online_accounts(1)
+    user = ac1.get_config("addr")
+    password = ac1.get_config("mail_pw")
+    mailbox = imap_tools.MailBox(user.split("@")[1])
+    mailbox.login(user, password)
+    return mailbox
+
+
+class TestMetadataTokens:
+    "Tests that use Metadata extension for storing tokens"
+
+    def test_set_get_metadata(self, imap_mailbox):
+        "set and get metadata token for an account"
+        client = imap_mailbox.client
+        client.send(b'a01 SETMETADATA INBOX (/private/devicetoken "1111" )\n')
+        res = client.readline()
+        assert b"OK Setmetadata completed" in res
+
+        client.send(b"a02 GETMETADATA INBOX /private/devicetoken\n")
+        res = client.readline()
+        assert res[:1] == b"*"
+        res = client.readline().strip().rstrip(b")")
+        assert res == b"1111"
+        assert b"Getmetadata completed" in client.readline()
+
+        client.send(b'a01 SETMETADATA INBOX (/private/devicetoken "2222" )\n')
+        res = client.readline()
+        assert b"OK Setmetadata completed" in res
+
+        client.send(b"a02 GETMETADATA INBOX /private/devicetoken\n")
+        res = client.readline()
+        assert res[:1] == b"*"
+        res = client.readline().strip().rstrip(b")")
+        assert res == b"1111 2222"
+        assert b"Getmetadata completed" in client.readline()
 
 
 class TestEndToEndDeltaChat:
@@ -75,7 +115,10 @@ class TestEndToEndDeltaChat:
                         )
                     lp.indent("good, message sending failed because quota was exceeded")
                     return
-            if "stored mail into mailbox 'inbox'" in line or "saved mail to inbox" in line:
+            if (
+                "stored mail into mailbox 'inbox'" in line
+                or "saved mail to inbox" in line
+            ):
                 saved_ok += 1
                 print(f"{saved_ok}: {line}")
                 if saved_ok >= num_to_send: