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 = self._km.get_key(ADDRESS, openpgp.OpenPGPKey)
pgp = openpgp.OpenPGPScheme(self._soledad)
pgp.delete_key(pubkey)
# mock the key fetching
self._km.fetch_keys_from_server = Mock(return_value=[])
# change the configuration
self._config['encrypted_only'] = False
# prepare the SMTP factory
proto = SMTPFactory(
self._km, self._config).buildProtocol(('127.0.0.1', 0))
transport = proto_helpers.StringTransport()
proto.makeConnection(transport)
proto.lineReceived(self.EMAIL_DATA[0] + '\r\n')
proto.lineReceived(self.EMAIL_DATA[1] + '\r\n')
proto.lineReceived(self.EMAIL_DATA[2] + '\r\n')
# ensure the address was accepted
lines = transport.value().rstrip().split('\n')
self.assertEqual(
'250 Recipient address accepted',
lines[-1],
'Address should have been accepted with appropriate message.')
def test_message_sign(self):
"""
Test if message is signed with sender key.
"""
# mock the key fetching
self._km.fetch_keys_from_server = Mock(return_value=[])
proto = SMTPFactory(
self._km, self._config).buildProtocol(('127.0.0.1', 0))
user = User('*****@*****.**', 'relay.leap.se', proto, ADDRESS)
fromAddr = Address(ADDRESS_2)
m = EncryptedMessage(fromAddr, user, self._km, self._config)
for line in self.EMAIL_DATA[4:12]:
m.lineReceived(line)
# trigger signing
m.eomReceived()
# assert content of message
self.assertTrue(
m._message.get_payload().startswith(
'-----BEGIN PGP SIGNED MESSAGE-----\n' +
'Hash: SHA1\n\n' +
('\r\n'.join(self.EMAIL_DATA[9:12]) + '\r\n' +
'-----BEGIN PGP SIGNATURE-----\n')),
'Message does not start with signature header.')
self.assertTrue(
m._message.get_payload().endswith(
'-----END PGP SIGNATURE-----\n'),
'Message does not end with signature footer.')
# assert signature is valid
pubkey = self._km.get_key(ADDRESS_2, openpgp.OpenPGPKey)
self.assertTrue(
openpgp.verify(m._message.get_payload(), pubkey),
'Signature could not be verified.')
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 = self._km.get_key(ADDRESS, openpgp.OpenPGPKey)
pgp = openpgp.OpenPGPScheme(
self._soledad, gpgbinary=self.GPG_BINARY_PATH)
pgp.delete_key(pubkey)
# mock the key fetching
self._km.fetch_keys_from_server = Mock(return_value=[])
# change the configuration
self._config['encrypted_only'] = False
# prepare the SMTP factory
proto = SMTPFactory(
self._km, self._config).buildProtocol(('127.0.0.1', 0))
transport = proto_helpers.StringTransport()
proto.makeConnection(transport)
proto.lineReceived(self.EMAIL_DATA[0] + '\r\n')
proto.lineReceived(self.EMAIL_DATA[1] + '\r\n')
proto.lineReceived(self.EMAIL_DATA[2] + '\r\n')
# ensure the address was accepted
lines = transport.value().rstrip().split('\n')
self.assertEqual(
'250 Recipient address accepted',
lines[-1],
'Address should have been accepted with appropriate message.')
def setup_smtp_relay(port, keymanager, smtp_host, smtp_port, smtp_username,
smtp_password, encrypted_only):
"""
Setup SMTP relay to run with Twisted.
This function sets up the SMTP relay configuration and the Twisted
reactor.
@param port: The port in which to run the server.
@type port: int
@param keymanager: A Key Manager from where to get recipients' public
keys.
@type keymanager: leap.common.keymanager.KeyManager
@param smtp_host: The hostname of the remote SMTP server.
@type smtp_host: str
@param smtp_port: The port of the remote SMTP server.
@type smtp_port: int
@param smtp_username: The username used to connect to remote SMTP server.
@type smtp_username: str
@param smtp_password: The password used to connect to remote SMTP server.
@type smtp_password: str
@param encrypted_only: Whether the SMTP relay should send unencrypted mail
or not.
@type encrypted_only: bool
"""
# The configuration for the SMTP relay is a dict with the following
# format:
#
# {
# 'host': '<host>',
# 'port': <int>,
# 'username': '******',
# 'password': '******',
# 'encrypted_only': <True/False>
# }
config = {
'host': smtp_host,
'port': smtp_port,
'username': smtp_username,
'password': smtp_password,
'encrypted_only': encrypted_only
}
# configure the use of this service with twistd
factory = SMTPFactory(keymanager, config)
reactor.listenTCP(port, factory)
def test_message_encrypt(self):
"""
Test if message gets encrypted to destination email.
"""
proto = SMTPFactory(
self._km, self._config).buildProtocol(('127.0.0.1', 0))
fromAddr = Address(ADDRESS_2)
dest = User(ADDRESS, 'relay.leap.se', proto, ADDRESS)
m = EncryptedMessage(fromAddr, dest, self._km, self._config)
for line in self.EMAIL_DATA[4:12]:
m.lineReceived(line)
m.eomReceived()
privkey = self._km.get_key(
ADDRESS, openpgp.OpenPGPKey, private=True)
decrypted = openpgp.decrypt_asym(m._message.get_payload(), privkey)
self.assertEqual(
'\r\n'.join(self.EMAIL_DATA[9:12]) + '\r\n',
decrypted,
'Decrypted text differs from plaintext.')
def test_relay_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']
proto = SMTPFactory(
self._km, self._config).buildProtocol(('127.0.0.1', 0))
transport = proto_helpers.StringTransport()
proto.makeConnection(transport)
for i, line in enumerate(self.EMAIL_DATA):
proto.lineReceived(line + '\r\n')
self.assertMatch(transport.value(),
'\r\n'.join(SMTP_ANSWERS[0:i + 1]),
'Did not get expected answer from relay.')
proto.setTimeout(None)
def test_relay_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']
proto = SMTPFactory(
self._km, self._config).buildProtocol(('127.0.0.1', 0))
transport = proto_helpers.StringTransport()
proto.makeConnection(transport)
for i, line in enumerate(self.EMAIL_DATA):
proto.lineReceived(line + '\r\n')
self.assertMatch(transport.value(),
'\r\n'.join(SMTP_ANSWERS[0:i + 1]),
'Did not get expected answer from relay.')
proto.setTimeout(None)
def test_message_encrypt_sign(self):
"""
Test if message gets encrypted to destination email and signed with
sender key.
"""
proto = SMTPFactory(
self._km, self._config).buildProtocol(('127.0.0.1', 0))
user = User(ADDRESS, 'relay.leap.se', proto, ADDRESS)
fromAddr = Address(ADDRESS_2)
m = EncryptedMessage(fromAddr, user, self._km, self._config)
for line in self.EMAIL_DATA[4:12]:
m.lineReceived(line)
# trigger encryption and signing
m.eomReceived()
# decrypt and verify
privkey = self._km.get_key(
ADDRESS, openpgp.OpenPGPKey, private=True)
pubkey = self._km.get_key(ADDRESS_2, openpgp.OpenPGPKey)
decrypted = openpgp.decrypt_asym(
m._message.get_payload(), privkey, verify=pubkey)
self.assertEqual(
'\r\n'.join(self.EMAIL_DATA[9:12]) + '\r\n',
decrypted,
'Decrypted text differs from plaintext.')
