Add scripts/generate-dns-zone.sh

README.md

@@ -1,61 +1,26 @@
-# Chatmail instances optimized for Delta Chat apps 
+# Chat Mail server configuration
 
-This repository helps to setup a ready-to-use chatmail instance
+This repository setups a ready-to-go chatmail instance
 comprised of a minimal setup of the battle-tested 
-[postfix smtp](https://www.postfix.org) and [dovecot imap](https://www.dovecot.org) services. 
+[postfix smtp server](https://www.postfix.org) and [dovecot imap server](https://www.dovecot.org).
 
-The setup is designed and optimized for providing chatmail accounts 
+## Getting started 
-for use by [Delta Chat apps](https://delta.chat).
 
-Chatmail accounts are automatically created by a first login, 
+1. prepare your local system:
-after which the initially specified password is required for using them. 
-
-## Getting Started deploying your own chatmail instance
-
-1. Prepare your local (presumably Linux) system:
 
     scripts/init.sh 
 
-2. Setup a domain with `A` and `AAAA` records for your chatmail server.
+2. setup a domain with `A` and `AAAA` records for your chatmail server
 
-3. Set environment variable to the chatmail domain you want to setup:
+3. set environment variable to the chatmail domain you want to setup:
 
     export CHATMAIL_DOMAIN=c1.testrun.org   # replace with your host
 
-4. Deploy the chat mail instance to your chatmail server: 
+4. run the deploy of the chat mail instance: 
 
     scripts/deploy.sh 
 
-   This script uses `pyinfra` and `ssh` to setup packages and configure
+5. run `scripts/generate-dns-zone.sh` and create the generated DNS records at your DNS provider
-   the chatmail instance on your remote server. 
-
-5. Run `scripts/generate-dns-zone.sh` and 
-   transfer the generated DNS records at your DNS provider
-
-6. Start a Delta Chat app and create a new account 
-   by typing an e-mail address with an arbitrary username 
-   and `@<your-chatmail-domain>` appended. 
-   Use an at least 10-character random password. 
-
-
-### Ports
-
-Postfix listens on ports 25 (smtp) and 587 (submission) and 465 (submissions).
-Dovecot listens on ports 143(imap) and 993 (imaps).
-
-Delta Chat will, however, discover all ports and configurations 
-automatically by reading the `autoconfig.xml` file from the chatmail instance. 
-
-
-## Emergency Commands to disable automatic account creation 
-
-If you need to stop account creation,
-e.g. because some script is wildly creating accounts, run:
-
-    touch /etc/chatmail-nocreate
-
-While this file is present, account creation will be blocked. 
-
 
 ## Running tests and benchmarks (offline and online) 
 
@@ -70,26 +35,28 @@ While this file is present, account creation will be blocked.
 
     scripts/bench.sh 
 
+## Running tests (offline and online) 
 
-## Development Background for chatmail instances 
+```
+## Dovecot/Postfix configuration
 
-This repository drives the development of "chatmail instances", 
+### Ports
-comprised of minimal setups of 
 
-- [postfix smtp server](https://www.postfix.org) 
+Postfix listens on ports 25 (smtp) and 587 (submission) and 465 (submissions).
-- [dovecot imap server](https://www.dovecot.org) 
+Dovecot listens on ports 143(imap) and 993 (imaps).
 
-as well as two custom services that are integrated with these two: 
+## DNS
 
-- `chatmaild/src/chatmaild/dictproxy.py` implements 
+For DKIM you must add a DNS entry as found in /etc/opendkim/selector.txt on your chatmail instance.
-  create-on-login account creation semantics and is used
+The above `scripts/deploy.sh` prints out the DKIM selector and DNS entry you
-  by Dovecot during login authentication and by Postfix
+need to setup with your DNS provider. 
-  which in turn uses Dovecot SASL to authenticate users
-  to send mails for them. 
-
-- `chatmaild/src/chatmaild/filtermail.py` prevents 
-  unencrypted e-mail from leaving the chatmail instance
-  and is integrated into postfix's outbound mail pipelines. 
 
+## 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/src/chatmaild/dictproxy.py

@@ -21,27 +21,15 @@ def encrypt_password(password: str):
     return "{SHA512-CRYPT}" + passhash
 
 
-def check_password(password) -> bool:
+def create_user(db, user, password):
-    """Check password policy"""
-    if len(password) < 10:
-        return False
-    return True
-
-
-def create_user(db, user, encrypted_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, encrypted_password)
+        conn.create_user(user, password)
-    return dict(
+    return dict(home=f"/home/vmail/{user}", uid="vmail", gid="vmail", password=password)
-        home=f"/home/vmail/{user}",
-        uid="vmail",
-        gid="vmail",
-        password=encrypted_password,
-    )
 
 
 def get_user_data(db, user):
@@ -60,9 +48,6 @@ def lookup_userdb(db, user):
 def lookup_passdb(db, user, password):
     userdata = get_user_data(db, user)
     if not userdata:
-        if not check_password(password):
-            logging.warning("Attempt to create an account with a weak password.")
-            return
         return create_user(db, user, encrypt_password(password))
     userdata["password"] = userdata["password"].strip()
     return userdata

deploy-chatmail/src/deploy_chatmail/__init__.py

@@ -183,17 +183,6 @@ def _configure_dovecot(mail_server: str, debug: bool = False) -> bool:
         mode="644",
     )
 
-    # as per https://doc.dovecot.org/configuration_manual/os/
-    # it is recommended to set the following inotify limits
-    for name in ("max_user_instances", "max_user_watches"):
-        key = f"fs.inotify.{name}"
-        server.sysctl(
-            name=f"Change {key}",
-            key=key,
-            value=65535,
-            persist=True,
-        )
-
     return need_restart
 
 

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

@@ -118,24 +118,6 @@ service auth-worker {
   user = vmail
 }
 
-service imap-login {
-    # High-security mode.
-    # Each process serves a single connection and exits afterwards.
-    # This is the default, but we set it explicitly to be sure.
-    # See <https://doc.dovecot.org/admin_manual/login_processes/#high-security-mode> for details.
-    service_count = 1
-
-    # Inrease the number of simultaneous connections.
-    #
-    # As of Dovecot 2.3.19.1 the default is 100 processes.
-    # Combined with `service_count = 1` it means only 100 connections
-    # can be handled simultaneously.
-    process_limit = 10000
-
-    # Avoid startup latency for new connections.
-    process_min_avail = 10
-}
-
 ssl = required
 ssl_cert = </var/lib/acme/live/{{ config.hostname }}/fullchain
 ssl_key = </var/lib/acme/live/{{ config.hostname }}/privkey

scripts/bench.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 set -e
 
-venv/bin/pytest online-tests/benchmark.py -vrx 
+online-tests/venv/bin/pytest online-tests/benchmark.py -vrx 

tests/chatmaild/test_dictproxy.py

@@ -18,7 +18,7 @@ def test_basic(db):
     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", "Pieg9aeToe3eghuthe5u")
+    lookup_passdb(db, "link2xt@c1.testrun.org", "asdf")
     data = get_user_data(db, "link2xt@c1.testrun.org")
     assert data
 
@@ -37,7 +37,7 @@ def test_nocreate_file(db):
     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", "zequ0Aimuchoodaechik")
+    lookup_passdb(db, "newuser1@something.org", "kajdlqweqwe")
     assert not get_user_data(db, "newuser1@something.org")
     os.remove(chatmaild.dictproxy.NOCREATE_FILE)
 

tests/online/test_0_login.py

@@ -23,11 +23,6 @@ def test_login_basic_functioning(imap_or_smtp, gencreds, lp):
     with pytest.raises(imap_or_smtp.AuthError):
         imap_or_smtp.login(user, password + "wrong")
 
-    lp.sec(f"creating users with a short password is not allowed")
-    user, _password = gencreds()
-    with pytest.raises(imap_or_smtp.AuthError):
-        imap_or_smtp.login(user, "admin")
-
 
 def test_login_same_password(imap_or_smtp, gencreds):
     """Test two different users logging in with the same password