Base on Stretch, add Zeyple
andryyy
parent
34bc242554
commit
2b955d08ab
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@ -1,4 +1,4 @@
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FROM ubuntu:xenial
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FROM debian:testing-slim
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MAINTAINER Andre Peters <andre.peters@servercow.de>
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ENV DEBIAN_FRONTEND noninteractive
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@ -19,10 +19,19 @@ RUN apt-get install -y --no-install-recommends supervisor \
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postfix-pcre \
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syslog-ng \
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syslog-ng-core \
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ca-certificates
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ca-certificates \
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gnupg \
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python-gpgme \
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sudo \
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dirmngr
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RUN addgroup --system --gid 600 zeyple
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RUN adduser --system --home /var/lib/zeyple --no-create-home --uid 600 --gid 600 --disabled-login zeyple
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RUN touch /var/log/zeyple.log && chown zeyple: /var/log/zeyple.log
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RUN sed -i -E 's/^(\s*)system\(\);/\1unix-stream("\/dev\/log");/' /etc/syslog-ng/syslog-ng.conf
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COPY zeyple.py /usr/local/bin/zeyple.py
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COPY zeyple.conf /etc/zeyple.conf
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COPY supervisord.conf /etc/supervisor/supervisord.conf
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COPY postfix.sh /opt/postfix.sh
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@ -17,7 +17,7 @@ user = ${DBUSER}
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password = ${DBPASS}
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hosts = mysql
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dbname = ${DBNAME}
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query = SELECT IF( EXISTS( SELECT 'TLS_ACTIVE' FROM alias LEFT OUTER JOIN mailbox ON mailbox.username = alias.address WHERE (address='%s' OR address IN (SELECT CONCAT('%u', '@', target_domain) FROM alias_domain WHERE alias_domain='%d')) AND mailbox.tls_enforce_in = '1' AND mailbox.active = '1'), 'reject_plaintext_session', 'DUNNO') AS 'tls_enforce_in';
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query = SELECT IF( EXISTS( SELECT 'TLS_ACTIVE' FROM alias LEFT OUTER JOIN mailbox ON mailbox.username = alias.goto WHERE (address='%s' OR address IN (SELECT CONCAT('%u', '@', target_domain) FROM alias_domain WHERE alias_domain='%d')) AND mailbox.tls_enforce_in = '1' AND mailbox.active = '1'), 'reject_plaintext_session', NULL) AS 'tls_enforce_in';
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EOF
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cat <<EOF > /opt/postfix/conf/sql/mysql_tls_enforce_out_policy.cf
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@ -25,7 +25,7 @@ user = ${DBUSER}
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password = ${DBPASS}
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hosts = mysql
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dbname = ${DBNAME}
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query = SELECT IF( EXISTS( SELECT 'TLS_ACTIVE' FROM alias LEFT OUTER JOIN mailbox ON mailbox.username = alias.address WHERE (address='%s' OR address IN (SELECT CONCAT('%u', '@', target_domain) FROM alias_domain WHERE alias_domain='%d')) AND mailbox.tls_enforce_out = '1' AND mailbox.active = '1'), 'smtp_enforced_tls:', 'DUNNO') AS 'tls_enforce_out';
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query = SELECT IF( EXISTS( SELECT 'TLS_ACTIVE' FROM alias LEFT OUTER JOIN mailbox ON mailbox.username = alias.goto WHERE (address='%s' OR address IN (SELECT CONCAT('%u', '@', target_domain) FROM alias_domain WHERE alias_domain='%d')) AND mailbox.tls_enforce_out = '1' AND mailbox.active = '1'), 'smtp_enforced_tls:', NULL) AS 'tls_enforce_out';
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EOF
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cat <<EOF > /opt/postfix/conf/sql/mysql_virtual_alias_domain_catchall_maps.cf
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@ -92,11 +92,21 @@ dbname = ${DBNAME}
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query = SELECT goto FROM spamalias WHERE address='%s' AND validity >= UNIX_TIMESTAMP()
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EOF
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# Reset GPG key permissions
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mkdir -p /var/lib/zeyple/keys
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chmod 700 /var/lib/zeyple/keys
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chown -R 600:600 /var/lib/zeyple/keys
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# Fix Postfix permissions
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chgrp -R postdrop /var/spool/postfix/public
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chgrp -R postdrop /var/spool/postfix/maildrop
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postfix set-permissions
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postconf -c /opt/postfix/conf
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if [[ $? != 0 ]]; then
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echo "Postfix configuration error, refusing to start."
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exit 1
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else
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postfix -c /opt/postfix/conf start
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supervisorctl restart postfix-maillog
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sleep 126144000
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fi
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@ -12,6 +12,17 @@ command=/opt/postfix.sh
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autorestart=true
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[program:postfix-maillog]
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command=/usr/bin/tail -f /var/log/mail.log
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stdout_logfile=/dev/fd/1
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command=/bin/tail -f /var/log/zeyple.log /var/log/mail.log
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stdout_logfile=/dev/stdout
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stdout_logfile_maxbytes=0
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[unix_http_server]
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file=/var/tmp/supervisord.sock
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chmod=0770
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chown=nobody:nogroup
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[supervisorctl]
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serverurl=unix:///var/tmp/supervisord.sock
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[rpcinterface:supervisor]
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supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
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@ -0,0 +1,9 @@
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[zeyple]
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log_file = /var/log/zeyple.log
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[gpg]
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home = /var/lib/zeyple/keys
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[relay]
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host = localhost
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port = 10026
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@ -0,0 +1,274 @@
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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import sys
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import os
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import logging
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import email
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import email.mime.multipart
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import email.mime.application
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import email.encoders
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import smtplib
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import copy
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from io import BytesIO
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try:
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from configparser import SafeConfigParser # Python 3
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except ImportError:
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from ConfigParser import SafeConfigParser # Python 2
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import gpgme
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# Boiler plate to avoid dependency on six
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# BBB: Python 2.7 support
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PY3K = sys.version_info > (3, 0)
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def message_from_binary(message):
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if PY3K:
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return email.message_from_bytes(message)
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else:
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return email.message_from_string(message)
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def as_binary_string(email):
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if PY3K:
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return email.as_bytes()
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else:
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return email.as_string()
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def encode_string(string):
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if isinstance(string, bytes):
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return string
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else:
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return string.encode('utf-8')
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__title__ = 'Zeyple'
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__version__ = '1.2.0'
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__author__ = 'Cédric Félizard'
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__license__ = 'AGPLv3+'
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__copyright__ = 'Copyright 2012-2016 Cédric Félizard'
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class Zeyple:
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"""Zeyple Encrypts Your Precious Log Emails"""
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def __init__(self, config_fname='zeyple.conf'):
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self.config = self.load_configuration(config_fname)
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log_file = self.config.get('zeyple', 'log_file')
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logging.basicConfig(
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filename=log_file, level=logging.DEBUG,
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format='%(asctime)s %(process)s %(levelname)s %(message)s'
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)
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logging.info("Zeyple ready to encrypt outgoing emails")
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def load_configuration(self, filename):
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"""Reads and parses the config file"""
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config = SafeConfigParser()
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config.read([
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os.path.join('/etc/', filename),
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filename,
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])
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if not config.sections():
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raise IOError('Cannot open config file.')
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return config
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@property
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def gpg(self):
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protocol = gpgme.PROTOCOL_OpenPGP
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if self.config.has_option('gpg', 'executable'):
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executable = self.config.get('gpg', 'executable')
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else:
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executable = None # Default value
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home_dir = self.config.get('gpg', 'home')
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ctx = gpgme.Context()
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ctx.set_engine_info(protocol, executable, home_dir)
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ctx.armor = True
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return ctx
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def process_message(self, message_data, recipients):
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"""Encrypts the message with recipient keys"""
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message_data = encode_string(message_data)
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in_message = message_from_binary(message_data)
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logging.info(
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"Processing outgoing message %s", in_message['Message-id'])
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if not recipients:
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logging.warn("Cannot find any recipients, ignoring")
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sent_messages = []
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for recipient in recipients:
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logging.info("Recipient: %s", recipient)
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key_id = self._user_key(recipient)
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logging.info("Key ID: %s", key_id)
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if key_id:
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out_message = self._encrypt_message(in_message, key_id)
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# Delete Content-Transfer-Encoding if present to default to
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# "7bit" otherwise Thunderbird seems to hang in some cases.
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del out_message["Content-Transfer-Encoding"]
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else:
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logging.warn("No keys found, message will be sent unencrypted")
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out_message = copy.copy(in_message)
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self._add_zeyple_header(out_message)
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self._send_message(out_message, recipient)
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sent_messages.append(out_message)
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return sent_messages
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def _get_version_part(self):
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ret = email.mime.application.MIMEApplication(
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'Version: 1\n',
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'pgp-encrypted',
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email.encoders.encode_noop,
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)
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ret.add_header(
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'Content-Description',
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"PGP/MIME version identification",
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)
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return ret
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def _get_encrypted_part(self, payload):
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ret = email.mime.application.MIMEApplication(
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payload,
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'octet-stream',
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email.encoders.encode_noop,
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name="encrypted.asc",
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)
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ret.add_header('Content-Description', "OpenPGP encrypted message")
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ret.add_header(
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'Content-Disposition',
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'inline',
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filename='encrypted.asc',
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)
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return ret
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def _encrypt_message(self, in_message, key_id):
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if in_message.is_multipart():
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# get the body (after the first \n\n)
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payload = in_message.as_string().split("\n\n", 1)[1].strip()
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# prepend the Content-Type including the boundary
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content_type = "Content-Type: " + in_message["Content-Type"]
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payload = content_type + "\n\n" + payload
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message = email.message.Message()
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message.set_payload(payload)
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payload = message.get_payload()
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else:
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payload = in_message.get_payload()
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payload = encode_string(payload)
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quoted_printable = email.charset.Charset('ascii')
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quoted_printable.body_encoding = email.charset.QP
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message = email.mime.nonmultipart.MIMENonMultipart(
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'text', 'plain', charset='utf-8'
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)
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message.set_payload(payload, charset=quoted_printable)
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mixed = email.mime.multipart.MIMEMultipart(
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'mixed',
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None,
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[message],
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)
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# remove superfluous header
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del mixed['MIME-Version']
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payload = as_binary_string(mixed)
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encrypted_payload = self._encrypt_payload(payload, [key_id])
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version = self._get_version_part()
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encrypted = self._get_encrypted_part(encrypted_payload)
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out_message = copy.copy(in_message)
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out_message.preamble = "This is an OpenPGP/MIME encrypted " \
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"message (RFC 4880 and 3156)"
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if 'Content-Type' not in out_message:
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out_message['Content-Type'] = 'multipart/encrypted'
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else:
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out_message.replace_header(
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'Content-Type',
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'multipart/encrypted',
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)
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out_message.set_param('protocol', 'application/pgp-encrypted')
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out_message.set_payload([version, encrypted])
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return out_message
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def _encrypt_payload(self, payload, key_ids):
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"""Encrypts the payload with the given keys"""
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payload = encode_string(payload)
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plaintext = BytesIO(payload)
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ciphertext = BytesIO()
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self.gpg.armor = True
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recipient = [self.gpg.get_key(key_id) for key_id in key_ids]
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self.gpg.encrypt(recipient, gpgme.ENCRYPT_ALWAYS_TRUST,
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plaintext, ciphertext)
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return ciphertext.getvalue()
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def _user_key(self, email):
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"""Returns the GPG key for the given email address"""
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logging.info("Trying to encrypt for %s", email)
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keys = [key for key in self.gpg.keylist(email)]
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if keys:
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key = keys.pop() # NOTE: looks like keys[0] is the master key
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key_id = key.subkeys[0].keyid
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return key_id
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return None
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def _add_zeyple_header(self, message):
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if self.config.has_option('zeyple', 'add_header') and \
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self.config.getboolean('zeyple', 'add_header'):
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message.add_header(
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'X-Zeyple',
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"processed by {0} v{1}".format(__title__, __version__)
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)
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def _send_message(self, message, recipient):
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"""Sends the given message through the SMTP relay"""
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logging.info("Sending message %s", message['Message-id'])
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smtp = smtplib.SMTP(self.config.get('relay', 'host'),
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self.config.get('relay', 'port'))
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smtp.sendmail(message['From'], recipient, message.as_string())
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smtp.quit()
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logging.info("Message %s sent", message['Message-id'])
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if __name__ == '__main__':
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recipients = sys.argv[1:]
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# BBB: Python 2.7 support
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binary_stdin = sys.stdin.buffer if PY3K else sys.stdin
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message = binary_stdin.read()
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zeyple = Zeyple()
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zeyple.process_message(message, recipients)
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Reference in New Issue