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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# fingerprint_resolver.py
# Copyright (C) 2015 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 resolve expiration date of certs.
Test this with postmap -v -q "fingerprint" tcp:localhost:2424
"""
from datetime import datetime
from twisted.internet.protocol import ServerFactory
from twisted.protocols import postfix
from twisted.python import log
from leap.mx.tcp_map import TCP_MAP_CODE_SUCCESS
from leap.mx.tcp_map import TCP_MAP_CODE_PERMANENT_FAILURE
class LEAPPostfixTCPMapFingerprintServer(postfix.PostfixTCPMapServer):
"""
A postfix tcp map fingerprint resolver server.
"""
def _cbGot(self, res):
"""
Return a code and message depending on the result of the factory's
get().
:param res: The fingerprint and expiration date of the cert
:type res: (str, str)
"""
fingerprint, expiry = (None, None)
if res is not None:
fingerprint, expiry = res
if expiry is None:
code = TCP_MAP_CODE_PERMANENT_FAILURE
msg = "NOT FOUND SRY"
elif expiry < datetime.utcnow().strftime("%Y-%m-%d"):
code = TCP_MAP_CODE_PERMANENT_FAILURE
msg = "EXPIRED CERT"
else:
# properly encode expiry, otherwise twisted complains when replying
if isinstance(expiry, unicode):
expiry = expiry.encode("utf8")
code = TCP_MAP_CODE_SUCCESS
msg = fingerprint + " " + expiry
self.sendCode(code, postfix.quote(msg))
class FingerprintResolverFactory(ServerFactory, object):
"""
A factory for postfix tcp map fingerprint resolver servers.
"""
protocol = LEAPPostfixTCPMapFingerprintServer
def __init__(self, couchdb):
"""
Initialize the factory.
:param couchdb: A CouchDB client.
:type couchdb: leap.mx.couchdbhelper.ConnectedCouchDB
"""
self._cdb = couchdb
def get(self, fingerprint):
"""
Look up the cert expiration date based on fingerprint.
:param fingerprint: The cert fingerprint.
:type fingerprint: str
:return: A deferred that will be fired with the expiration date.
:rtype: Deferred
"""
log.msg("look up: %s" % (fingerprint,))
d = self._cdb.getCertExpiry(fingerprint.lower())
d.addCallback(lambda expiry: (fingerprint, expiry))
d.addErrback(log.err)
return d
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