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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for L{twisted.cred}'s implementation of CRAM-MD5.
"""
from __future__ import division, absolute_import
from hmac import HMAC
from binascii import hexlify
from twisted.trial.unittest import TestCase
from twisted.cred.credentials import CramMD5Credentials
from twisted.cred.credentials import IUsernameHashedPassword
class CramMD5CredentialsTests(TestCase):
"""
Tests for L{CramMD5Credentials}.
"""
def test_idempotentChallenge(self):
"""
The same L{CramMD5Credentials} will always provide the same challenge,
no matter how many times it is called.
"""
c = CramMD5Credentials()
chal = c.getChallenge()
self.assertEqual(chal, c.getChallenge())
def test_checkPassword(self):
"""
When a valid response (which is a hex digest of the challenge that has
been encrypted by the user's shared secret) is set on the
L{CramMD5Credentials} that created the challenge, and C{checkPassword}
is called with the user's shared secret, it will return L{True}.
"""
c = CramMD5Credentials()
chal = c.getChallenge()
c.response = hexlify(HMAC(b'secret', chal).digest())
self.assertTrue(c.checkPassword(b'secret'))
def test_noResponse(self):
"""
When there is no response set, calling C{checkPassword} will return
L{False}.
"""
c = CramMD5Credentials()
self.assertFalse(c.checkPassword(b'secret'))
def test_wrongPassword(self):
"""
When an invalid response is set on the L{CramMD5Credentials} (one that
is not the hex digest of the challenge, encrypted with the user's shared
secret) and C{checkPassword} is called with the user's correct shared
secret, it will return L{False}.
"""
c = CramMD5Credentials()
chal = c.getChallenge()
c.response = hexlify(HMAC(b'thewrongsecret', chal).digest())
self.assertFalse(c.checkPassword(b'secret'))
def test_setResponse(self):
"""
When C{setResponse} is called with a string that is the username and
the hashed challenge separated with a space, they will be set on the
L{CramMD5Credentials}.
"""
c = CramMD5Credentials()
chal = c.getChallenge()
c.setResponse(b" ".join(
(b"squirrel",
hexlify(HMAC(b'supersecret', chal).digest()))))
self.assertTrue(c.checkPassword(b'supersecret'))
self.assertEqual(c.username, b"squirrel")
def test_interface(self):
"""
L{CramMD5Credentials} implements the L{IUsernameHashedPassword}
interface.
"""
self.assertTrue(
IUsernameHashedPassword.implementedBy(CramMD5Credentials))
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