dictproxy: use crypt instead of doveadm pw

This reverts commit fb2ea27477.

README.md

@@ -47,3 +47,13 @@ Dovecot listens on ports 143(imap) and 993 (imaps).
 For DKIM you must add a DNS entry as found in /etc/opendkim/selector.txt on your chatmail instance.
 The above `scripts/deploy.sh` prints out the DKIM selector and DNS entry you
 need to setup with your DNS provider. 
+
+## Emergency Commands
+
+If you need to stop account creation,
+e.g. because some script is wildly creating accounts,
+just run `touch /tmp/nocreate`.
+You can remove the file
+as soon as the attacker was banned
+by different means.
+

chatmaild/pyproject.toml

@@ -10,7 +10,6 @@ dependencies = [
 ]
 
 [project.scripts]
-doveauth = "chatmaild.doveauth:main"
 doveauth-dictproxy = "chatmaild.dictproxy:main"
 filtermail = "chatmaild.filtermail:main"
 

chatmaild/src/chatmaild/dictproxy.py

@@ -1,32 +1,32 @@
+import logging
 import os
 import sys
 import json
+import crypt
 from socketserver import (
     UnixStreamServer,
     StreamRequestHandler,
     ThreadingMixIn,
 )
 import pwd
-import subprocess
 
 from .database import Database
 
+NOCREATE_FILE = "/etc/chatmail-nocreate"
+
 
 def encrypt_password(password: str):
-    password = password.encode("ascii")
     # https://doc.dovecot.org/configuration_manual/authentication/password_schemes/
-    process = subprocess.Popen(
-        ["doveadm", "pw", "-s", "SHA512-CRYPT"],
-        stdin=subprocess.PIPE,
-        stdout=subprocess.PIPE,
-    )
-    stdout_data, _stderr_data = process.communicate(
-        input=password + b"\n" + password + b"\n"
-    )
-    return stdout_data.decode("ascii").strip()
+    passhash = crypt.crypt(password, crypt.METHOD_SHA512)
+    return "{SHA512-CRYPT}" + passhash
 
 
 def create_user(db, user, password):
+    if os.path.exists(NOCREATE_FILE):
+        logging.warning(
+            f"Didn't create account: {NOCREATE_FILE} exists. Delete the file to enable account creation."
+        )
+        return
     with db.write_transaction() as conn:
         conn.create_user(user, password)
     return dict(home=f"/home/vmail/{user}", uid="vmail", gid="vmail", password=password)
@@ -53,7 +53,7 @@ def lookup_passdb(db, user, password):
     return userdata
 
 
-def handle_dovecot_request(msg, db):
+def handle_dovecot_request(msg, db, mail_domain):
     print(f"received msg: {msg!r}", file=sys.stderr)
     short_command = msg[0]
     if short_command == "L":  # LOOKUP
@@ -64,13 +64,15 @@ def handle_dovecot_request(msg, db):
         res = ""
         if namespace == "shared":
             if type == "userdb":
-                res = lookup_userdb(db, user)
+                if user.endswith(f"@{mail_domain}"):
+                    res = lookup_userdb(db, user)
                 if res:
                     reply_command = "O"
                 else:
                     reply_command = "N"
             elif type == "passdb":
-                res = lookup_passdb(db, user, password=args[0])
+                if user.endswith(f"@{mail_domain}"):
+                    res = lookup_passdb(db, user, password=args[0])
                 if res:
                     reply_command = "O"
                 else:
@@ -89,6 +91,8 @@ def main():
     socket = sys.argv[1]
     passwd_entry = pwd.getpwnam(sys.argv[2])
     db = Database(sys.argv[3])
+    with open("/etc/mailname", "r") as fp:
+        mail_domain = fp.read().strip()
 
     class Handler(StreamRequestHandler):
         def handle(self):
@@ -96,7 +100,7 @@ def main():
                 msg = self.rfile.readline().strip().decode()
                 if not msg:
                     break
-                res = handle_dovecot_request(msg, db)
+                res = handle_dovecot_request(msg, db, mail_domain)
                 if res:
                     print(f"sending result: {res!r}", file=sys.stderr)
                     self.wfile.write(res.encode("ascii"))

chatmaild/src/chatmaild/doveauth.py

@@ -1,65 +0,0 @@
-#!/usr/bin/env python3
-import base64
-import sys
-
-from .database import Database
-
-
-def get_user_data(db, user):
-    with db.read_connection() as conn:
-        result = conn.get_user(user)
-    if result:
-        result["uid"] = "vmail"
-        result["gid"] = "vmail"
-    return result
-
-
-def create_user(db, user, password):
-    with db.write_transaction() as conn:
-        conn.create_user(user, password)
-    return dict(home=f"/home/vmail/{user}", uid="vmail", gid="vmail", password=password)
-
-
-def verify_user(db, user, password):
-    userdata = get_user_data(db, user)
-    if userdata:
-        if userdata.get("password") == password:
-            userdata["status"] = "ok"
-        else:
-            userdata["status"] = "fail"
-    else:
-        userdata = create_user(db, user, password)
-        userdata["status"] = "ok"
-
-    return userdata
-
-
-def lookup_user(db, user):
-    userdata = get_user_data(db, user)
-    if userdata:
-        userdata["status"] = "ok"
-    else:
-        userdata["status"] = "fail"
-    return userdata
-
-
-def dump_result(res):
-    for key, value in res.items():
-        print(f"{key}={value}")
-
-
-def main():
-    db = Database("/home/vmail/passdb.sqlite")
-    if sys.argv[1] == "hexauth":
-        login = base64.b16decode(sys.argv[2]).decode()
-        password = base64.b16decode(sys.argv[3]).decode()
-        res = verify_user(db, login, password)
-        dump_result(res)
-    elif sys.argv[1] == "hexlookup":
-        login = base64.b16decode(sys.argv[2]).decode()
-        res = lookup_user(db, login)
-        dump_result(res)
-
-
-if __name__ == "__main__":
-    main()

chatmaild/src/chatmaild/filtermail.py

@@ -1,11 +1,14 @@
 #!/usr/bin/env python3
 import asyncio
 import logging
+import time
+import sys
 from email.parser import BytesParser
 from email import policy
+from email.utils import parseaddr
 
-from aiosmtpd.lmtp import LMTP
-from aiosmtpd.controller import UnixSocketController
+from aiosmtpd.smtp import SMTP
+from aiosmtpd.controller import Controller
 from smtplib import SMTP as SMTPClient
 
 
@@ -31,79 +34,93 @@ def check_encrypted(message):
     return True
 
 
-class ExampleController(UnixSocketController):
+class SMTPController(Controller):
     def factory(self):
-        return LMTP(self.handler, **self.SMTP_kwargs)
+        return SMTP(self.handler, **self.SMTP_kwargs)
 
 
-class ExampleHandler:
-    async def handle_RCPT(self, server, session, envelope, address, rcpt_options):
-        envelope.rcpt_tos.append(address)
+class BeforeQueueHandler:
+    def __init__(self):
+        self.send_rate_limiter = SendRateLimiter()
+
+    async def handle_MAIL(self, server, session, envelope, address, mail_options):
+        logging.info(f"handle_MAIL from {address}")
+        envelope.mail_from = address
+        if not self.send_rate_limiter.is_sending_allowed(address):
+            return f"450 4.7.1: Too much mail from {address}"
+
+        parts = envelope.mail_from.split("@")
+        if len(parts) != 2:
+            return f"500 Invalid from address <{envelope.mail_from!r}>"
+
         return "250 OK"
 
     async def handle_DATA(self, server, session, envelope):
-        logging.info("Processing DATA message from %s", envelope.mail_from)
-
-        valid_recipients = []
-
-        message = BytesParser(policy=policy.default).parsebytes(envelope.content)
-        mail_encrypted = check_encrypted(message)
-
-        res = []
-        for recipient in envelope.rcpt_tos:
-            my_local_domain = envelope.mail_from.split("@")
-            if len(my_local_domain) != 2:
-                res += [f"500 Invalid from address <{envelope.mail_from}>"]
-                continue
-
-            if envelope.mail_from == recipient:
-                # Always allow sending emails to self.
-                valid_recipients += [recipient]
-                res += ["250 OK"]
-                continue
-
-            recipient_local_domain = recipient.split("@")
-            if len(recipient_local_domain) != 2:
-                res += [f"500 Invalid address <{recipient}>"]
-                continue
-
-            is_outgoing = recipient_local_domain[1] != my_local_domain[1]
-
-            if (
-                is_outgoing
-                and not mail_encrypted
-                and message.get("secure-join") != "vc-request"
-                and message.get("secure-join") != "vg-request"
-            ):
-                res += ["500 Outgoing mail must be encrypted"]
-                continue
-
-            valid_recipients += [recipient]
-            res += ["250 OK"]
-
-        # Reinject the mail back into Postfix.
-        if valid_recipients:
-            logging.info("Reinjecting the mail")
-            client = SMTPClient("localhost", "10026")
-            client.sendmail(envelope.mail_from, valid_recipients, envelope.content)
-
-        return "\r\n".join(res)
+        logging.info("handle_DATA before-queue")
+        error = check_DATA(envelope)
+        if error:
+            return error
+        logging.info("re-injecting the mail that passed checks")
+        client = SMTPClient("localhost", "10025")
+        client.sendmail(envelope.mail_from, envelope.rcpt_tos, envelope.content)
+        return "250 OK"
 
 
-async def asyncmain(loop):
-    controller = ExampleController(
-        ExampleHandler(), unix_socket="/var/spool/postfix/private/filtermail"
-    )
-    controller.start()
+async def asyncmain_beforequeue(port):
+    Controller(BeforeQueueHandler(), hostname="127.0.0.1", port=port).start()
+
+
+def check_DATA(envelope):
+    """the central filtering function for e-mails."""
+    logging.info(f"Processing DATA message from {envelope.mail_from}")
+
+    message = BytesParser(policy=policy.default).parsebytes(envelope.content)
+    mail_encrypted = check_encrypted(message)
+
+    _, from_addr = parseaddr(message.get("from").strip())
+    logging.info(f"mime-from: {from_addr} envelope-from: {envelope.mail_from!r}")
+    if envelope.mail_from.lower() != from_addr.lower():
+        return f"500 Invalid FROM <{from_addr!r}> for <{envelope.mail_from!r}>"
+
+    envelope_from_domain = from_addr.split("@").pop()
+    for recipient in envelope.rcpt_tos:
+        if envelope.mail_from == recipient:
+            # Always allow sending emails to self.
+            continue
+        res = recipient.split("@")
+        if len(res) != 2:
+            return f"500 Invalid address <{recipient}>"
+        _recipient_addr, recipient_domain = res
+
+        is_outgoing = recipient_domain != envelope_from_domain
+        if is_outgoing and not mail_encrypted:
+            is_securejoin = message.get("secure-join") in ["vc-request", "vg-request"]
+            if not is_securejoin:
+                return f"500 Invalid unencrypted mail to <{recipient}>"
+
+
+class SendRateLimiter:
+    MAX_USER_SEND_PER_MINUTE = 80
+
+    def __init__(self):
+        self.addr2timestamps = {}
+
+    def is_sending_allowed(self, mail_from):
+        last = self.addr2timestamps.setdefault(mail_from, [])
+        now = time.time()
+        last[:] = [ts for ts in last if ts >= (now - 60)]
+        if len(last) <= self.MAX_USER_SEND_PER_MINUTE:
+            last.append(now)
+            return True
+        return False
 
 
 def main():
+    args = sys.argv[1:]
+    assert len(args) == 1
     logging.basicConfig(level=logging.INFO)
     loop = asyncio.new_event_loop()
     asyncio.set_event_loop(loop)
-    loop.create_task(asyncmain(loop=loop))
+    task = asyncmain_beforequeue(port=int(args[0]))
+    loop.create_task(task)
     loop.run_forever()
-
-
-if __name__ == "__main__":
-    main()

chatmaild/src/chatmaild/filtermail.service

@@ -1,8 +1,8 @@
 [Unit]
-Description=Email filter for chatmail servers
+Description=Chatmail Postfix BeforeQeue filter 
 
 [Service]
-ExecStart=/usr/local/bin/filtermail
+ExecStart=/usr/local/bin/filtermail 10080
 Restart=always
 RestartSec=30
 

chatmaild/src/chatmaild/test_doveauth.py

@@ -1,7 +1,9 @@
+import os
+
 import pytest
 
-from .dictproxy import get_user_data
-from .doveauth import verify_user
+import chatmaild.dictproxy
+from .dictproxy import get_user_data, lookup_passdb
 from .database import Database, DBError
 
 
@@ -13,16 +15,31 @@ def db(tmpdir):
 
 
 def test_basic(db):
-    verify_user(db, "link2xt@c1.testrun.org", "asdf")
+    chatmaild.dictproxy.NOCREATE_FILE = "/tmp/nocreate"
+    if os.path.exists(chatmaild.dictproxy.NOCREATE_FILE):
+        os.remove(chatmaild.dictproxy.NOCREATE_FILE)
+    lookup_passdb(db, "link2xt@c1.testrun.org", "asdf")
     data = get_user_data(db, "link2xt@c1.testrun.org")
     assert data
 
 
-def test_verify_or_create(db):
-    res = verify_user(db, "newuser1@something.org", "kajdlkajsldk12l3kj1983")
-    assert res["status"] == "ok"
-    res = verify_user(db, "newuser1@something.org", "kajdlqweqwe")
-    assert res["status"] == "fail"
+def test_dont_overwrite_password_on_wrong_login(db):
+    """Test that logging in with a different password doesn't create a new user"""
+    res = lookup_passdb(db, "newuser1@something.org", "kajdlkajsldk12l3kj1983")
+    assert res["password"]
+    res2 = lookup_passdb(db, "newuser1@something.org", "kajdlqweqwe")
+    # this function always returns a password hash, which is actually compared by dovecot.
+    assert res["password"] == res2["password"]
+
+
+def test_nocreate_file(db):
+    chatmaild.dictproxy.NOCREATE_FILE = "/tmp/nocreate"
+    with open(chatmaild.dictproxy.NOCREATE_FILE, "w+") as f:
+        f.write("")
+    assert os.path.exists(chatmaild.dictproxy.NOCREATE_FILE)
+    lookup_passdb(db, "newuser1@something.org", "kajdlqweqwe")
+    assert not get_user_data(db, "newuser1@something.org")
+    os.remove(chatmaild.dictproxy.NOCREATE_FILE)
 
 
 def test_db_version(db):

chatmaild/src/chatmaild/test_filtermail.py

@@ -1,6 +1,42 @@
-from .filtermail import check_encrypted
+from .filtermail import check_encrypted, check_DATA, SendRateLimiter
 from email.parser import BytesParser
 from email import policy
+import pytest
+
+
+def test_reject_forged_from():
+    def makemail(from_addr):
+        return BytesParser(policy=policy.default).parsebytes(
+            "\r\n".join(
+                [
+                    f"From: <{from_addr}",
+                    "To: <barbaz@c3.testrun.org>",
+                    "Date: Sun, 15 Oct 2023 16:41:44 +0000",
+                    "Message-ID: <Mr.3gckbNy5bch.uK3Hd2Ws6-w@c2.testrun.org>",
+                    "References: <Mr.3gckbNy5bch.uK3Hd2Ws6-w@c2.testrun.org>",
+                    "Chat-Version: 1.0",
+                    "MIME-Version: 1.0",
+                    "Content-Type: text/plain; charset=utf-8; format=flowed; delsp=no",
+                    "",
+                    "Hi!",
+                    "",
+                    "",
+                ]
+            ).encode()
+        )
+
+    class envelope:
+        mail_from = "bob@c3.testrun.org"
+        rcpt_tos = ["somebody@c3.testrun.org"]
+
+    # test that the filter lets good mail through
+    envelope.content = makemail(envelope.mail_from).as_bytes()
+    assert not check_DATA(envelope=envelope)
+
+    # test that the filter rejects forged mail
+    envelope.content = makemail("forged@c3.testrun.org").as_bytes()
+    error = check_DATA(envelope=envelope)
+    assert "500" in error
 
 
 def test_filtermail():
@@ -288,3 +324,15 @@ def test_filtermail():
             ]
         ).encode()
     )
+
+
+def test_send_rate_limiter():
+    limiter = SendRateLimiter()
+    for i in range(100):
+        if limiter.is_sending_allowed("some@example.org"):
+            if i <= SendRateLimiter.MAX_USER_SEND_PER_MINUTE:
+                continue
+            pytest.fail("limiter didn't work")
+        else:
+            assert i == SendRateLimiter.MAX_USER_SEND_PER_MINUTE + 1
+            break

deploy-chatmail/src/deploy_chatmail/__init__.py

@@ -34,43 +34,28 @@ def _install_chatmaild() -> None:
             commands=[f"pip install --break-system-packages {remote_path}"],
         )
 
-        files.put(
-            name="upload doveauth-dictproxy.service",
-            src=importlib.resources.files("chatmaild")
-            .joinpath("doveauth-dictproxy.service")
-            .open("rb"),
-            dest="/etc/systemd/system/doveauth-dictproxy.service",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        systemd.service(
-            name="Setup doveauth-dictproxy service",
-            service="doveauth-dictproxy.service",
-            running=True,
-            enabled=True,
-            restarted=True,
-            daemon_reload=True,
-        )
-
-        files.put(
-            name="upload filtermail.service",
-            src=importlib.resources.files("chatmaild")
-            .joinpath("filtermail.service")
-            .open("rb"),
-            dest="/etc/systemd/system/filtermail.service",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        systemd.service(
-            name="Setup filtermail service",
-            service="filtermail.service",
-            running=True,
-            enabled=True,
-            restarted=True,
-            daemon_reload=True,
-        )
+        for fn in (
+            "doveauth-dictproxy",
+            "filtermail",
+        ):
+            files.put(
+                name=f"Upload {fn}.service",
+                src=importlib.resources.files("chatmaild")
+                .joinpath(f"{fn}.service")
+                .open("rb"),
+                dest=f"/etc/systemd/system/{fn}.service",
+                user="root",
+                group="root",
+                mode="644",
+            )
+            systemd.service(
+                name=f"Setup {fn} service",
+                service=f"{fn}.service",
+                running=True,
+                enabled=True,
+                restarted=True,
+                daemon_reload=True,
+            )
 
 
 def _configure_opendkim(domain: str, dkim_selector: str) -> bool:
@@ -173,6 +158,33 @@ def _configure_dovecot(mail_server: str, debug: bool = False) -> bool:
     return need_restart
 
 
+def _configure_nginx(domain: str, debug: bool = False) -> bool:
+    """Configures nginx HTTP server."""
+    need_restart = False
+
+    main_config = files.template(
+        src=importlib.resources.files(__package__).joinpath("nginx.conf.j2"),
+        dest="/etc/nginx/nginx.conf",
+        user="root",
+        group="root",
+        mode="644",
+        config={"domain_name": domain},
+    )
+    need_restart |= main_config.changed
+
+    autoconfig = files.template(
+        src=importlib.resources.files(__package__).joinpath("autoconfig.xml.j2"),
+        dest="/var/www/html/.well-known/autoconfig/mail/config-v1.1.xml",
+        user="root",
+        group="root",
+        mode="644",
+        config={"domain_name": domain},
+    )
+    need_restart |= autoconfig.changed
+
+    return need_restart
+
+
 def deploy_chatmail(mail_domain: str, mail_server: str, dkim_selector: str) -> None:
     """Deploy a chat-mail instance.
 
@@ -194,7 +206,7 @@ def deploy_chatmail(mail_domain: str, mail_server: str, dkim_selector: str) -> N
     )
 
     # Deploy acmetool to have TLS certificates.
-    deploy_acmetool(domains=[mail_server])
+    deploy_acmetool(nginx_hook=True, domains=[mail_server])
 
     apt.packages(
         name="Install Postfix",
@@ -214,11 +226,17 @@ def deploy_chatmail(mail_domain: str, mail_server: str, dkim_selector: str) -> N
         ],
     )
 
+    apt.packages(
+        name="Install nginx",
+        packages=["nginx"],
+    )
+
     _install_chatmaild()
     debug = False
     dovecot_need_restart = _configure_dovecot(mail_server, debug=debug)
     postfix_need_restart = _configure_postfix(mail_domain, debug=debug)
     opendkim_need_restart = _configure_opendkim(mail_domain, dkim_selector)
+    nginx_need_restart = _configure_nginx(mail_domain)
 
     systemd.service(
         name="Start and enable OpenDKIM",
@@ -244,6 +262,37 @@ def deploy_chatmail(mail_domain: str, mail_server: str, dkim_selector: str) -> N
         restarted=dovecot_need_restart,
     )
 
+    systemd.service(
+        name="Start and enable nginx",
+        service="nginx.service",
+        running=True,
+        enabled=True,
+        restarted=nginx_need_restart,
+    )
+
+    # This file is used by auth proxy.
+    # https://wiki.debian.org/EtcMailName
+    server.shell(
+        name="Setup /etc/mailname",
+        commands=[f"echo {mail_domain} >/etc/mailname; chmod 644 /etc/mailname"],
+    )
+
+    journald_conf = files.put(
+        name="Configure journald",
+        src=importlib.resources.files(__package__).joinpath("journald.conf"),
+        dest="/etc/systemd/journald.conf",
+        user="root",
+        group="root",
+        mode="644",
+    )
+    systemd.service(
+        name="Start and enable journald",
+        service="systemd-journald.service",
+        running=True,
+        enabled=True,
+        restarted=journald_conf,
+    )
+
     def callback():
         result = server.shell(
             commands=[

deploy-chatmail/src/deploy_chatmail/acmetool/__init__.py

@@ -38,22 +38,13 @@ def deploy_acmetool(nginx_hook=False, email="", domains=[]):
         email=email,
     )
 
-    service_file = files.put(
-        src=importlib.resources.files(__package__)
-        .joinpath("acmetool-redirector.service")
-        .open("rb"),
-        dest="/etc/systemd/system/acmetool-redirector.service",
+    files.template(
+        src=importlib.resources.files(__package__).joinpath("target.yaml.j2"),
+        dest="/var/lib/acme/conf/target",
         user="root",
         group="root",
         mode="644",
     )
-    systemd.service(
-        name="Setup acmetool-redirector service",
-        service="acmetool-redirector.service",
-        running=False,
-        enabled=False,
-        restarted=service_file.changed,
-    )
 
     for domain in domains:
         server.shell(

deploy-chatmail/src/deploy_chatmail/acmetool/acmetool-redirector.service

@@ -1,11 +0,0 @@
-[Unit]
-Description=acmetool HTTP redirector
-
-[Service]
-Type=notify
-ExecStart=/usr/bin/acmetool redirector --service.uid=daemon
-Restart=always
-RestartSec=30
-
-[Install]
-WantedBy=multi-user.target

deploy-chatmail/src/deploy_chatmail/acmetool/target.yaml.j2

@@ -0,0 +1,7 @@
+request:
+  provider: https://acme-v02.api.letsencrypt.org/directory
+  key:
+    type: rsa
+  challenge:
+    webroot-paths:
+    - /var/www/html/.well-known/acme-challenge

deploy-chatmail/src/deploy_chatmail/autoconfig.xml.j2

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<clientConfig version="1.1">
+  <emailProvider id="{{ config.domain_name }}">
+    <domain>{{ config.domain_name }}</domain>
+    <displayName>{{ config.domain_name }} chatmail</displayName>
+    <displayShortName>{{ config.domain_name }}</displayShortName>
+    <incomingServer type="imap">
+      <hostname>{{ config.domain_name }}</hostname>
+      <port>993</port>
+      <socketType>SSL</socketType>
+      <authentication>password-cleartext</authentication>
+      <username>%EMAILADDRESS%</username>
+    </incomingServer>
+    <incomingServer type="imap">
+      <hostname>{{ config.domain_name }}</hostname>
+      <port>143</port>
+      <socketType>STARTTLS</socketType>
+      <authentication>password-cleartext</authentication>
+      <username>%EMAILADDRESS%</username>
+    </incomingServer>
+    <outgoingServer type="smtp">
+      <hostname>{{ config.domain_name }}</hostname>
+      <port>465</port>
+      <socketType>SSL</socketType>
+      <authentication>password-cleartext</authentication>
+      <username>%EMAILADDRESS%</username>
+    </outgoingServer>
+    <outgoingServer type="smtp">
+      <hostname>{{ config.domain_name }}</hostname>
+      <port>587</port>
+      <socketType>STARTTLS</socketType>
+      <authentication>password-cleartext</authentication>
+      <username>%EMAILADDRESS%</username>
+    </outgoingServer>
+  </emailProvider>
+</clientConfig>

deploy-chatmail/src/deploy_chatmail/dovecot/dovecot.conf.j2

@@ -16,6 +16,12 @@ mail_debug = yes
 
 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
+
+
 # Authentication for system users.
 passdb {
   driver = dict

deploy-chatmail/src/deploy_chatmail/journald.conf

@@ -0,0 +1,2 @@
+[Journal]
+MaxRetentionSec=3d

deploy-chatmail/src/deploy_chatmail/nginx.conf.j2

@@ -0,0 +1,47 @@
+user www-data;
+worker_processes auto;
+pid /run/nginx.pid;
+error_log /var/log/nginx/error.log;
+
+events {
+	worker_connections 768;
+	# multi_accept on;
+}
+
+http {
+	sendfile on;
+	tcp_nopush on;
+
+	# Do not emit nginx version on error pages.
+	server_tokens off;
+
+	include /etc/nginx/mime.types;
+	default_type application/octet-stream;
+
+	ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
+	ssl_prefer_server_ciphers on;
+	ssl_certificate /var/lib/acme/live/{{ config.domain_name }}/fullchain;
+	ssl_certificate_key /var/lib/acme/live/{{ config.domain_name }}/privkey;
+
+	gzip on;
+
+	server {
+		listen 80 default_server;
+		listen [::]:80 default_server;
+		listen 443 ssl default_server;
+		listen [::]:443 ssl default_server;
+
+		root /var/www/html;
+
+		index index.html index.htm;
+
+		server_name _;
+
+		location / {
+			# First attempt to serve request as file, then
+			# as directory, then fall back to displaying a 404.
+			try_files $uri $uri/ =404;
+		}
+	}
+}
+

deploy-chatmail/src/deploy_chatmail/postfix/master.cf.j2

@@ -32,7 +32,7 @@ submission inet n       -       y       -       -       smtpd
   -o smtpd_recipient_restrictions=
   -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
   -o milter_macro_daemon_name=ORIGINATING
-  -o content_filter=filter:unix:private/filtermail
+  -o smtpd_proxy_filter=127.0.0.1:10080
 smtps     inet  n       -       y       -       -       smtpd
   -o syslog_name=postfix/smtps
   -o smtpd_tls_wrappermode=yes
@@ -47,7 +47,7 @@ smtps     inet  n       -       y       -       -       smtpd
   -o smtpd_recipient_restrictions=
   -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
   -o milter_macro_daemon_name=ORIGINATING
-  -o content_filter=filter:unix:private/filtermail
+  -o smtpd_proxy_filter=127.0.0.1:10080
 #628       inet  n       -       y       -       -       qmqpd
 pickup    unix  n       -       y       60      1       pickup
 cleanup   unix  n       -       y       -       0       cleanup
@@ -76,5 +76,5 @@ scache    unix  -       -       y       -       1       scache
 postlog   unix-dgram n  -       n       -       1       postlogd
 filter    unix -        n       n       -       -       lmtp
 # Local SMTP server for reinjecting filered mail.
-localhost:10026 inet  n       -       n       -       10      smtpd
-        -o content_filter=
+localhost:10025 inet  n       -       n       -       10      smtpd
+  -o syslog_name=postfix/reinject

online-tests/conftest.py

@@ -75,6 +75,24 @@ class ImapConn:
         print(f"imap-login {user!r} {password!r}")
         self.conn.login(user, password)
 
+    def fetch_all(self):
+        print("imap-fetch all")
+        status, res = self.conn.select()
+        if int(res[0]) == 0:
+            raise ValueError("no messages in imap folder")
+        status, results = self.conn.fetch("1:*", "(RFC822)")
+        assert status == "OK"
+        return results
+
+    def fetch_all_messages(self):
+        print("imap-fetch all messages")
+        results = self.fetch_all()
+        messages = []
+        for item in results:
+            if len(item) == 2:
+                messages.append(item[1].decode())
+        return messages
+
 
 @pytest.fixture
 def smtp(maildomain):
@@ -97,6 +115,11 @@ class SmtpConn:
         print(f"smtp-login {user!r} {password!r}")
         self.conn.login(user, password)
 
+    def sendmail(self, from_addr, to_addrs, msg):
+        print(f"smtp-sendmail from={from_addr!r} to_addrs={to_addrs!r}")
+        print(f"smtp-sendmail message size: {len(msg)}")
+        return self.conn.sendmail(from_addr=from_addr, to_addrs=to_addrs, msg=msg)
+
 
 @pytest.fixture(params=["imap", "smtp"])
 def imap_or_smtp(request):
@@ -198,4 +221,66 @@ class Remote:
         )
         while 1:
             line = self.popen.stdout.readline()
-            yield line.decode().strip().lower()
+            res = line.decode().strip().lower()
+            if res:
+                yield res
+            else:
+                break
+
+
+@pytest.fixture
+def mailgen(request):
+    class Mailgen:
+        def get_encrypted(self, from_addr, to_addr):
+            data = request.fspath.dirpath("mailgen/encrypted.eml").read()
+            return data.format(from_addr=from_addr, to_addr=to_addr)
+
+    return Mailgen()
+
+
+@pytest.fixture
+def cmsetup(maildomain, gencreds):
+    return CMSetup(maildomain, gencreds)
+
+
+class CMSetup:
+    def __init__(self, maildomain, gencreds):
+        self.maildomain = maildomain
+        self.gencreds = gencreds
+
+    def gen_users(self, num):
+        print(f"Creating {num} online users")
+        users = []
+        for i in range(num):
+            addr, password = self.gencreds()
+            user = CMUser(self.maildomain, addr, password)
+            assert user.smtp
+            users.append(user)
+        return users
+
+
+class CMUser:
+    def __init__(self, maildomain, addr, password):
+        self.maildomain = maildomain
+        self.addr = addr
+        self.password = password
+        self._smtp = None
+        self._imap = None
+
+    @property
+    def smtp(self):
+        if not self._smtp:
+            handle = SmtpConn(self.maildomain)
+            handle.connect()
+            handle.login(self.addr, self.password)
+            self._smtp = handle
+        return self._smtp
+
+    @property
+    def imap(self):
+        if not self._imap:
+            imap = ImapConn(self.maildomain)
+            imap.connect()
+            imap.login(self.addr, self.password)
+            self._imap = imap
+        return self._imap

online-tests/mailgen/encrypted.eml

@@ -0,0 +1,66 @@
+From: {from_addr}
+To: {to_addr}
+Subject: ...
+Date: Sun, 15 Oct 2023 16:43:21 +0000
+Message-ID: <Mr.UVyJWZmkCKM.hGzNc6glBE_@c2.testrun.org>
+In-Reply-To: <Mr.MvmCz-GQbi_.6FGRkhDf05c@c2.testrun.org>
+References: <Mr.3gckbNy5bch.uK3Hd2Ws6-w@c2.testrun.org>
+	<Mr.MvmCz-GQbi_.6FGRkhDf05c@c2.testrun.org>
+Chat-Version: 1.0
+Autocrypt: addr={from_addr}; prefer-encrypt=mutual;
+	keydata=xjMEZSwWjhYJKwYBBAHaRw8BAQdAQBEhqeJh0GueHB6kF/DUQqYCxARNBVokg/AzT+7LqH
+	rNFzxiYXJiYXpAYzIudGVzdHJ1bi5vcmc+wosEEBYIADMCGQEFAmUsFo4CGwMECwkIBwYVCAkKCwID
+	FgIBFiEEFTfUNvVnY3b9F7yHnmme1PfUhX8ACgkQnmme1PfUhX9A4AEAnHWHp49eBCMHK5t66gYPiW
+	XQuB1mwUjzGfYWB+0RXUoA/0xcQ3FbUNlGKW7Blp6eMFfViv6Mv2d3kNSXACB6nmcMzjgEZSwWjhIK
+	KwYBBAGXVQEFAQEHQBpY5L2M1XHo0uxf8SX1wNLBp/OVvidoWHQF2Jz+kJsUAwEIB8J4BBgWCAAgBQ
+	JlLBaOAhsMFiEEFTfUNvVnY3b9F7yHnmme1PfUhX8ACgkQnmme1PfUhX/INgEA37AJaNvruYsJVanP
+	IXnYw4CKd55UAwl8Zcy+M2diAbkA/0fHHcGV4r78hpbbL1Os52DPOdqYQRauIeJUeG+G6bQO
+MIME-Version: 1.0
+Content-Type: multipart/encrypted; protocol="application/pgp-encrypted";
+	boundary="YFrteb74qSXmggbOxZL9dRnhymywAi"
+
+
+--YFrteb74qSXmggbOxZL9dRnhymywAi
+Content-Description: PGP/MIME version identification
+Content-Type: application/pgp-encrypted
+
+Version: 1
+
+
+--YFrteb74qSXmggbOxZL9dRnhymywAi
+Content-Description: OpenPGP encrypted message
+Content-Disposition: inline; filename="encrypted.asc";
+Content-Type: application/octet-stream; name="encrypted.asc"
+
+-----BEGIN PGP MESSAGE-----
+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+=agR5
+-----END PGP MESSAGE-----
+
+
+--YFrteb74qSXmggbOxZL9dRnhymywAi--
+
+

online-tests/test_0_basic.py

@@ -1,3 +1,7 @@
+import smtplib
+import pytest
+
+
 def test_remote(remote, imap_or_smtp):
     lineproducer = remote.iter_output(imap_or_smtp.logcmd)
     imap_or_smtp.connect()
@@ -13,3 +17,44 @@ def test_use_two_chatmailservers(cmfactory, maildomain2):
     domain1 = ac1.get_config("addr").split("@")[1]
     domain2 = ac2.get_config("addr").split("@")[1]
     assert domain1 != domain2
+
+
+@pytest.mark.parametrize("forgeaddr", ["internal", "someone@example.org"])
+def test_reject_forged_from(cmsetup, mailgen, lp, forgeaddr):
+    user1, user3 = cmsetup.gen_users(2)
+
+    lp.sec("send encrypted message with forged from")
+    print("envelope_from", user1.addr)
+    if forgeaddr == "internal":
+        addr_to_forge = cmsetup.gen_users(1)[0].addr
+    else:
+        addr_to_forge = "someone@example.org"
+
+    print("message to inject:")
+    msg = mailgen.get_encrypted(from_addr=addr_to_forge, to_addr=user3.addr)
+    for line in msg.split("\n")[:4]:
+        print(f"   {line}")
+
+    lp.sec("Send forged mail and check remote postfix lmtp processing result")
+    with pytest.raises(smtplib.SMTPException) as e:
+        user1.smtp.sendmail(from_addr=user1.addr, to_addrs=[user3.addr], msg=msg)
+    assert "500" in str(e.value)
+
+
+@pytest.mark.slow
+def test_exceed_rate_limit(cmsetup, gencreds, mailgen):
+    """Test that the per-account send-mail limit is exceeded."""
+    user1, user2 = cmsetup.gen_users(2)
+    mail = mailgen.get_encrypted(user1.addr, user2.addr)
+    for i in range(100):
+        print("Sending mail", str(i))
+        try:
+            user1.smtp.sendmail(user1.addr, [user2.addr], mail)
+        except smtplib.SMTPException as e:
+            if i < 80:
+                pytest.fail(f"rate limit was exceeded too early with msg {i}")
+            outcome = e.recipients[user2.addr]
+            assert outcome[0] == 450
+            assert b'4.7.1: Too much mail from' in outcome[1]
+            return
+    pytest.fail("Rate limit was not exceeded")

online-tests/test_0_login.py

@@ -1,4 +1,5 @@
 import pytest
+import smtplib
 
 
 def test_login_basic_functioning(imap_or_smtp, gencreds, lp):

scripts/test.sh

@@ -1,7 +1,3 @@
 #!/bin/bash
-set -e
-pushd chatmaild/src/chatmaild
-../../venv/bin/pytest
-popd
-
-online-tests/venv/bin/pytest online-tests/ -vrx --durations=5
+chatmaild/venv/bin/pytest chatmaild/ $@
+online-tests/venv/bin/pytest online-tests/ -vrx --durations=5 $@