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# -*- coding: utf-8 -*-
# test_gateway.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/>.
"""
SMTP gateway tests.
"""
import re
from datetime import datetime
from twisted.mail import smtp
from twisted.internet import reactor
from twisted.internet.defer import inlineCallbacks, fail, succeed, Deferred
from twisted.test import proto_helpers
from mock import Mock
from leap.mail.smtp.gateway import SMTPFactory, LOCAL_FQDN
from leap.mail.smtp.gateway import SMTPDelivery
from leap.mail.outgoing.service import outgoingFactory
from leap.mail.tests import TestCaseWithKeyManager
from leap.mail.tests import ADDRESS, ADDRESS_2
from leap.keymanager import openpgp, errors
# some regexps
IP_REGEX = "(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}" + \
"([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])"
HOSTNAME_REGEX = "(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*" + \
"([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])"
IP_OR_HOST_REGEX = '(' + IP_REGEX + '|' + HOSTNAME_REGEX + ')'
TEST_USER = u'anotheruser@leap.se'
def getSMTPFactory(soledad_s, keymanager_s, sendmail_opts,
encrypted_only=False):
factory = UnauthenticatedSMTPFactory
factory.encrypted_only = encrypted_only
proto = factory(
soledad_s, keymanager_s, sendmail_opts).buildProtocol(('127.0.0.1', 0))
return proto
class UnauthenticatedSMTPServer(smtp.SMTP):
encrypted_only = False
def __init__(self, soledads, keyms, opts, encrypted_only=False):
smtp.SMTP.__init__(self)
userid = TEST_USER
keym = keyms[userid]
class Opts:
cert = '/tmp/cert'
key = '/tmp/cert'
hostname = 'remote'
port = 666
outgoing = outgoingFactory(
userid, keym, Opts, check_cert=False)
avatar = SMTPDelivery(userid, keym, encrypted_only, outgoing)
self.delivery = avatar
def validateFrom(self, helo, origin):
return origin
class UnauthenticatedSMTPFactory(SMTPFactory):
"""
A Factory that produces a SMTP server that does not authenticate user.
Only for tests!
"""
protocol = UnauthenticatedSMTPServer
domain = LOCAL_FQDN
encrypted_only = False
class TestSmtpGateway(TestCaseWithKeyManager):
EMAIL_DATA = ['HELO gateway.leap.se',
'MAIL FROM: <%s>' % ADDRESS_2,
'RCPT TO: <%s>' % ADDRESS,
'DATA',
'From: User <%s>' % ADDRESS_2,
'To: Leap <%s>' % ADDRESS,
'Date: ' + datetime.now().strftime('%c'),
'Subject: test message',
'',
'This is a secret message.',
'Yours,',
'A.',
'',
'.',
'QUIT']
def assertMatch(self, string, pattern, msg=None):
if not re.match(pattern, string):
msg = self._formatMessage(msg, '"%s" does not match pattern "%s".'
% (string, pattern))
raise self.failureException(msg)
@inlineCallbacks
def test_gateway_accepts_valid_email(self):
"""
Test if SMTP server responds correctly for valid interaction.
"""
SMTP_ANSWERS = ['220 ' + IP_OR_HOST_REGEX +
' NO UCE NO UBE NO RELAY PROBES',
'250 ' + IP_OR_HOST_REGEX + ' Hello ' +
IP_OR_HOST_REGEX + ', nice to meet you',
'250 Sender address accepted',
'250 Recipient address accepted',
'354 Continue']
user = TEST_USER
proto = getSMTPFactory({user: None}, {user: self._km}, {user: None})
transport = proto_helpers.StringTransport()
proto.makeConnection(transport)
reply = ""
for i, line in enumerate(self.EMAIL_DATA):
reply += yield self.getReply(line + '\r\n', proto, transport)
self.assertMatch(reply, '\r\n'.join(SMTP_ANSWERS),
'Did not get expected answer from gateway.')
proto.setTimeout(None)
@inlineCallbacks
def test_missing_key_rejects_address(self):
"""
Test if server rejects to send unencrypted when 'encrypted_only' is
True.
"""
# remove key from key manager
pubkey = yield self._km.get_key(ADDRESS, openpgp.OpenPGPKey)
pgp = openpgp.OpenPGPScheme(
self._soledad, gpgbinary=self.GPG_BINARY_PATH)
yield pgp.delete_key(pubkey)
# mock the key fetching
self._km._fetch_keys_from_server = Mock(
return_value=fail(errors.KeyNotFound()))
user = TEST_USER
proto = getSMTPFactory(
{user: None}, {user: self._km}, {user: None},
encrypted_only=True)
transport = proto_helpers.StringTransport()
proto.makeConnection(transport)
yield self.getReply(self.EMAIL_DATA[0] + '\r\n', proto, transport)
yield self.getReply(self.EMAIL_DATA[1] + '\r\n', proto, transport)
reply = yield self.getReply(self.EMAIL_DATA[2] + '\r\n',
proto, transport)
# ensure the address was rejected
self.assertEqual(
'550 Cannot receive for specified address\r\n',
reply,
'Address should have been rejected with appropriate message.')
proto.setTimeout(None)
@inlineCallbacks
def test_missing_key_accepts_address(self):
"""
Test if server accepts to send unencrypted when 'encrypted_only' is
False.
"""
# remove key from key manager
pubkey = yield self._km.get_key(ADDRESS, openpgp.OpenPGPKey)
pgp = openpgp.OpenPGPScheme(
self._soledad, gpgbinary=self.GPG_BINARY_PATH)
yield pgp.delete_key(pubkey)
# mock the key fetching
self._km._fetch_keys_from_server = Mock(
return_value=fail(errors.KeyNotFound()))
user = TEST_USER
proto = getSMTPFactory({user: None}, {user: self._km}, {user: None})
transport = proto_helpers.StringTransport()
proto.makeConnection(transport)
yield self.getReply(self.EMAIL_DATA[0] + '\r\n', proto, transport)
yield self.getReply(self.EMAIL_DATA[1] + '\r\n', proto, transport)
reply = yield self.getReply(self.EMAIL_DATA[2] + '\r\n',
proto, transport)
# ensure the address was accepted
self.assertEqual(
'250 Recipient address accepted\r\n',
reply,
'Address should have been accepted with appropriate message.')
proto.setTimeout(None)
def getReply(self, line, proto, transport):
proto.lineReceived(line)
if line[:4] not in ['HELO', 'MAIL', 'RCPT', 'DATA']:
return succeed("")
def check_transport(_):
reply = transport.value()
if reply:
transport.clear()
return succeed(reply)
d = Deferred()
d.addCallback(check_transport)
reactor.callLater(0, lambda: d.callback(None))
return d
return check_transport(None)
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