def test_nonce_count_management(self):
nm = SignedNonceManager(timeout=0.1)
request = make_request()
nonce1 = nm.generate_nonce(request)
self.assertEquals(nm.get_nonce_count(nonce1), None)
nm.set_nonce_count(nonce1, 1)
self.assertEquals(nm.get_nonce_count(nonce1), 1)
# purging won't remove it until it has expired.
nm._purge_expired_nonces()
self.assertEquals(nm.get_nonce_count(nonce1), 1)
time.sleep(0.1)
nm._purge_expired_nonces()
self.assertEquals(nm.get_nonce_count(nonce1), None)
def test_next_nonce_generation(self):
nm = SignedNonceManager(soft_timeout=0.1)
request = make_request()
nonce1 = nm.generate_nonce(request)
self.failUnless(nm.is_valid_nonce(nonce1, request))
# next-nonce is not generated until the soft timeout expires.
self.assertEquals(nm.get_next_nonce(nonce1, request), None)
time.sleep(0.1)
nonce2 = nm.get_next_nonce(nonce1, request)
self.assertNotEquals(nonce2, None)
self.assertNotEquals(nonce2, nonce1)
self.failUnless(nm.is_valid_nonce(nonce1, request))
self.failUnless(nm.is_valid_nonce(nonce2, request))
def test_pseudorandom_bytes(self):
nm = SignedNonceManager()
request = make_request()
nonce1 = nm.generate_nonce(request)
nonce2 = nm.generate_nonce(request)
for size in (4, 8, 32, 64, 212, 1234):
# We should be able to generate strings of any size.
self.assertEquals(len(nm.get_prandom_bytes(nonce1, size)), size)
# We should get the same bytes from the same nonce.
self.assertEquals(nm.get_prandom_bytes(nonce1, size),
nm.get_prandom_bytes(nonce1, size))
self.assertEquals(nm.get_prandom_bytes(nonce2, size),
nm.get_prandom_bytes(nonce2, size))
# We should get different bytes from different nonces.
self.assertNotEquals(nm.get_prandom_bytes(nonce1, size),
nm.get_prandom_bytes(nonce2, size))
def test_auto_purging_of_expired_nonces(self):
nm = SignedNonceManager(timeout=0.2)
request = make_request()
nonce1 = nm.generate_nonce(request)
nm.set_nonce_count(nonce1, 1)
time.sleep(0.1)
# nonce1 hasn't expired, so adding a new one won't purge it
nonce2 = nm.generate_nonce(request)
nm.set_nonce_count(nonce2, 1)
self.assertEquals(nm.get_nonce_count(nonce1), 1)
time.sleep(0.1)
# nonce1 has expired, it should be purged when adding another.
# nonce2 hasn't expired so it should remain in memory.
nonce3 = nm.generate_nonce(request)
nm.set_nonce_count(nonce3, 1)
self.assertEquals(nm.get_nonce_count(nonce1), None)
self.assertEquals(nm.get_nonce_count(nonce2), 1)
def test_nonce_validation(self):
nm = SignedNonceManager(timeout=0.1)
request = make_request(HTTP_USER_AGENT="good-user")
# malformed nonces should be invalid
self.failIf(nm.is_valid_nonce("", request))
self.failIf(nm.is_valid_nonce("IHACKYOU", request))
# immediately-generated nonces should be valid.
nonce = nm.generate_nonce(request)
self.failUnless(nm.is_valid_nonce(nonce, request))
# tampered-with nonces should be invalid
self.failIf(nm.is_valid_nonce(nonce + "IHACKYOU", request))
# nonces are only valid for specific user-agent
request2 = make_request(HTTP_USER_AGENT="nasty-hacker")
self.failIf(nm.is_valid_nonce(nonce, request2))
# expired nonces should be invalid
self.failUnless(nm.is_valid_nonce(nonce, request))
time.sleep(0.1)
self.failIf(nm.is_valid_nonce(nonce, request))
def __init__(self,
realm,
nonce_manager=None,
domain=None,
algorithm=None,
get_password=None,
get_verifier=None,
groupfinder=None):
if nonce_manager is None:
nonce_manager = SignedNonceManager()
if algorithm is None:
algorithm = "SRP-1024-SHA1"
self.realm = realm
self.nonce_manager = nonce_manager
self.domain = domain
self.algorithm = algorithm
self.get_password = get_password
self.get_verifier = get_verifier
self.groupfinder = groupfinder