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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
from zope.interface import implementer
from twisted.internet import defer
from twisted.trial import unittest
from twisted.words.protocols.jabber import jid, sasl, sasl_mechanisms, xmlstream
from twisted.words.xish import domish
NS_XMPP_SASL = "urn:ietf:params:xml:ns:xmpp-sasl"
@implementer(sasl_mechanisms.ISASLMechanism)
class DummySASLMechanism:
"""
Dummy SASL mechanism.
This just returns the initialResponse passed on creation, stores any
challenges and replies with the value of C{response}.
@ivar challenge: Last received challenge.
@type challenge: C{unicode}.
@ivar initialResponse: Initial response to be returned when requested
via C{getInitialResponse} or L{None}.
@type initialResponse: C{unicode}
"""
challenge = None
name = "DUMMY"
response = b""
def __init__(self, initialResponse):
self.initialResponse = initialResponse
def getInitialResponse(self):
return self.initialResponse
def getResponse(self, challenge):
self.challenge = challenge
return self.response
class DummySASLInitiatingInitializer(sasl.SASLInitiatingInitializer):
"""
Dummy SASL Initializer for initiating entities.
This hardwires the SASL mechanism to L{DummySASLMechanism}, that is
instantiated with the value of C{initialResponse}.
@ivar initialResponse: The initial response to be returned by the
dummy SASL mechanism or L{None}.
@type initialResponse: C{unicode}.
"""
initialResponse = None
def setMechanism(self):
self.mechanism = DummySASLMechanism(self.initialResponse)
class SASLInitiatingInitializerTests(unittest.TestCase):
"""
Tests for L{sasl.SASLInitiatingInitializer}
"""
def setUp(self):
self.output = []
self.authenticator = xmlstream.Authenticator()
self.xmlstream = xmlstream.XmlStream(self.authenticator)
self.xmlstream.send = self.output.append
self.xmlstream.connectionMade()
self.xmlstream.dataReceived(
b"<stream:stream xmlns='jabber:client' "
b"xmlns:stream='http://etherx.jabber.org/streams' "
b"from='example.com' id='12345' version='1.0'>"
)
self.init = DummySASLInitiatingInitializer(self.xmlstream)
def test_onFailure(self):
"""
Test that the SASL error condition is correctly extracted.
"""
failure = domish.Element(("urn:ietf:params:xml:ns:xmpp-sasl", "failure"))
failure.addElement("not-authorized")
self.init._deferred = defer.Deferred()
self.init.onFailure(failure)
self.assertFailure(self.init._deferred, sasl.SASLAuthError)
self.init._deferred.addCallback(
lambda e: self.assertEqual("not-authorized", e.condition)
)
return self.init._deferred
def test_sendAuthInitialResponse(self):
"""
Test starting authentication with an initial response.
"""
self.init.initialResponse = b"dummy"
self.init.start()
auth = self.output[0]
self.assertEqual(NS_XMPP_SASL, auth.uri)
self.assertEqual("auth", auth.name)
self.assertEqual("DUMMY", auth["mechanism"])
self.assertEqual("ZHVtbXk=", str(auth))
def test_sendAuthNoInitialResponse(self):
"""
Test starting authentication without an initial response.
"""
self.init.initialResponse = None
self.init.start()
auth = self.output[0]
self.assertEqual("", str(auth))
def test_sendAuthEmptyInitialResponse(self):
"""
Test starting authentication where the initial response is empty.
"""
self.init.initialResponse = b""
self.init.start()
auth = self.output[0]
self.assertEqual("=", str(auth))
def test_onChallenge(self):
"""
Test receiving a challenge message.
"""
d = self.init.start()
challenge = domish.Element((NS_XMPP_SASL, "challenge"))
challenge.addContent("bXkgY2hhbGxlbmdl")
self.init.onChallenge(challenge)
self.assertEqual(b"my challenge", self.init.mechanism.challenge)
self.init.onSuccess(None)
return d
def test_onChallengeResponse(self):
"""
A non-empty response gets encoded and included as character data.
"""
d = self.init.start()
challenge = domish.Element((NS_XMPP_SASL, "challenge"))
challenge.addContent("bXkgY2hhbGxlbmdl")
self.init.mechanism.response = b"response"
self.init.onChallenge(challenge)
response = self.output[1]
self.assertEqual("cmVzcG9uc2U=", str(response))
self.init.onSuccess(None)
return d
def test_onChallengeEmpty(self):
"""
Test receiving an empty challenge message.
"""
d = self.init.start()
challenge = domish.Element((NS_XMPP_SASL, "challenge"))
self.init.onChallenge(challenge)
self.assertEqual(b"", self.init.mechanism.challenge)
self.init.onSuccess(None)
return d
def test_onChallengeIllegalPadding(self):
"""
Test receiving a challenge message with illegal padding.
"""
d = self.init.start()
challenge = domish.Element((NS_XMPP_SASL, "challenge"))
challenge.addContent("bXkg=Y2hhbGxlbmdl")
self.init.onChallenge(challenge)
self.assertFailure(d, sasl.SASLIncorrectEncodingError)
return d
def test_onChallengeIllegalCharacters(self):
"""
Test receiving a challenge message with illegal characters.
"""
d = self.init.start()
challenge = domish.Element((NS_XMPP_SASL, "challenge"))
challenge.addContent("bXkg*Y2hhbGxlbmdl")
self.init.onChallenge(challenge)
self.assertFailure(d, sasl.SASLIncorrectEncodingError)
return d
def test_onChallengeMalformed(self):
"""
Test receiving a malformed challenge message.
"""
d = self.init.start()
challenge = domish.Element((NS_XMPP_SASL, "challenge"))
challenge.addContent("a")
self.init.onChallenge(challenge)
self.assertFailure(d, sasl.SASLIncorrectEncodingError)
return d
class SASLInitiatingInitializerSetMechanismTests(unittest.TestCase):
"""
Test for L{sasl.SASLInitiatingInitializer.setMechanism}.
"""
def setUp(self):
self.output = []
self.authenticator = xmlstream.Authenticator()
self.xmlstream = xmlstream.XmlStream(self.authenticator)
self.xmlstream.send = self.output.append
self.xmlstream.connectionMade()
self.xmlstream.dataReceived(
"<stream:stream xmlns='jabber:client' "
"xmlns:stream='http://etherx.jabber.org/streams' "
"from='example.com' id='12345' version='1.0'>"
)
self.init = sasl.SASLInitiatingInitializer(self.xmlstream)
def _setMechanism(self, name):
"""
Set up the XML Stream to have a SASL feature with the given mechanism.
"""
feature = domish.Element((NS_XMPP_SASL, "mechanisms"))
feature.addElement("mechanism", content=name)
self.xmlstream.features[(feature.uri, feature.name)] = feature
self.init.setMechanism()
return self.init.mechanism.name
def test_anonymous(self):
"""
Test setting ANONYMOUS as the authentication mechanism.
"""
self.authenticator.jid = jid.JID("example.com")
self.authenticator.password = None
name = "ANONYMOUS"
self.assertEqual(name, self._setMechanism(name))
def test_plain(self):
"""
Test setting PLAIN as the authentication mechanism.
"""
self.authenticator.jid = jid.JID("test@example.com")
self.authenticator.password = "secret"
name = "PLAIN"
self.assertEqual(name, self._setMechanism(name))
def test_digest(self):
"""
Test setting DIGEST-MD5 as the authentication mechanism.
"""
self.authenticator.jid = jid.JID("test@example.com")
self.authenticator.password = "secret"
name = "DIGEST-MD5"
self.assertEqual(name, self._setMechanism(name))
def test_notAcceptable(self):
"""
Test using an unacceptable SASL authentication mechanism.
"""
self.authenticator.jid = jid.JID("test@example.com")
self.authenticator.password = "secret"
self.assertRaises(
sasl.SASLNoAcceptableMechanism, self._setMechanism, "SOMETHING_UNACCEPTABLE"
)
def test_notAcceptableWithoutUser(self):
"""
Test using an unacceptable SASL authentication mechanism with no JID.
"""
self.authenticator.jid = jid.JID("example.com")
self.authenticator.password = "secret"
self.assertRaises(
sasl.SASLNoAcceptableMechanism, self._setMechanism, "SOMETHING_UNACCEPTABLE"
)
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