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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# check_recipient_access.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Classes for resolving postfix recipient access
Test this with postmap -v -q "foo" tcp:localhost:2244
"""
from twisted.protocols import postfix
from twisted.internet import defer
from leap.mx.tcp_map import LEAPPostfixTCPMapServerFactory
from leap.mx.tcp_map import TCP_MAP_CODE_SUCCESS
from leap.mx.tcp_map import TCP_MAP_CODE_TEMPORARY_FAILURE
from leap.mx.tcp_map import TCP_MAP_CODE_PERMANENT_FAILURE
class LEAPPostFixTCPMapAccessServer(postfix.PostfixTCPMapServer):
"""
A postfix tcp map recipient access checker server.
The server potentially receives the uuid and a PGP key for the user, which
are looked up by the factory, and will return a permanent or a temporary
failure in case either the user or the key don't exist, respectivelly.
"""
def _cbGot(self, value):
"""
Return a code and message depending on the result of the factory's
get().
For more info, see: http://www.postfix.org/access.5.html
:param value: The uuid and public key.
:type value: list
"""
address, pubkey = value
if address is None:
self.sendCode(
TCP_MAP_CODE_PERMANENT_FAILURE,
postfix.quote("REJECT"))
elif pubkey is None:
self.sendCode(
TCP_MAP_CODE_TEMPORARY_FAILURE,
postfix.quote("4.7.13 USER ACCOUNT DISABLED"))
else:
self.sendCode(
TCP_MAP_CODE_SUCCESS,
postfix.quote("OK"))
class CheckRecipientAccessFactory(LEAPPostfixTCPMapServerFactory):
"""
A factory for the recipient access checker.
When queried, the factory looks up the user's uuid and a PGP key for that
user and returns the result to the server's _cbGot() method.
"""
protocol = LEAPPostFixTCPMapAccessServer
def _getPubKey(self, address):
"""
Look up PGP public key based on email address.
:param address: The email address.
:type address: str
:return: A deferred that is fired with the address and the public key, if
each of them exists.
:rtype: DeferredList
"""
if not address:
return defer.succeed([None, None])
return defer.gatherResults([
defer.succeed(address),
self._cdb.getPubKey(address),
])
def get(self, key):
"""
Look up uuid and PGP public key based on key.
:param key: The lookup key.
:type key: str
"""
d = LEAPPostfixTCPMapServerFactory.get(self, key)
d.addCallback(self._getPubKey)
return d
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