def test_that_initialize_security_context_generates_negotiate_sign_token(
self):
ntlm_context = NtlmContext(self.auth,
hostname='thor',
session_security='sign')
context = ntlm_context.initialize_security_context()
token = context.send(None)
self.assertEqual(self.tokens.negotiate_sign, token)
def test_that_initialize_security_context_generates_negotiate_seal_token(
self):
ntlm_context = NtlmContext(self.auth,
hostname='DEVMAC',
session_security='encrypt')
context = ntlm_context.initialize_security_context()
token = context.send(None)
self.assertEqual(token, self.tokens.negotiate_seal)
def __init__(self, pkg_name):
self.pkg_info = win32security.QuerySecurityPackageInfo(pkg_name)
auth = PasswordAuthentication('workgroup',
'developer',
'password',
compatibility=4)
ntlm_context = NtlmContext(auth, session_security='none')
self.context = ntlm_context.initialize_security_context()
_BaseAuth.__init__(self)
def _credssp_processor(self):
"""
Implements a state machine
:return:
"""
response = (yield)
context = self._get_credssp_header(response)
if context is None:
raise Exception('The remote host did not respond with a \'www-authenticate\' header containing '
'\'CredSSP\' as an available authentication mechanism')
# 1. First, secure the channel with a RC4-SHA TLS Handshake
if not context:
tls_credssp = SSL.Connection(self.tls_credssp_context)
tls_credssp.set_connect_state()
while True:
try:
tls_credssp.do_handshake()
except SSL.WantReadError:
response = yield self._set_credssp_header(response.request, tls_credssp.bio_read(4096))
context = self._get_credssp_header(response)
if context is None or not context:
raise Exception('The remote host rejected the CredSSP TLS handshake')
tls_credssp.bio_write(context)
else:
break
# add logging to display the negotiated cipher (move to a function)
openssl_lib = _util.binding.lib
ffi = _util.binding.ffi
cipher = openssl_lib.SSL_get_current_cipher(tls_credssp._ssl)
cipher_name = ffi.string( openssl_lib.SSL_CIPHER_get_name(cipher))
# print cipher_name
# 2. Send an TSRequest containing an NTLM Negotiate Request
context = NtlmContext(PasswordAuthentication(self.domain, self.username, self.password), session_security='encrypt')
context_generator = context.initialize_security_context()
negotiate_token = context_generator.send(None)
ts_request = TSRequest()
ts_request['negoTokens'] = negotiate_token
tls_credssp.send(ts_request.getData())
http_challenge_response = yield self._set_credssp_header(response.request, tls_credssp.bio_read(4096))
# Extract and decrypt the encoded TSRequest response struct from the Negotiate header
authenticate_header = self._get_credssp_header(http_challenge_response)
if not authenticate_header or authenticate_header is None:
raise Exception("The remote host rejected the CredSSP negotiation token")
tls_credssp.bio_write(authenticate_header)
# NTLM Challenge Response and Server Public Key Validation
ts_request = TSRequest()
ts_request.fromString(tls_credssp.recv(8192))
challenge_token = ts_request['negoTokens']
server_cert = tls_credssp.get_peer_certificate()
# not using channel bindings
#certificate_digest = base64.b16decode(server_cert.digest('SHA256').replace(':', ''))
## channel_binding_structure = gss_channel_bindings_struct()
## channel_binding_structure['application_data'] = "tls-server-end-point:" + certificate_digest
public_key = HttpCredSSPAuth._get_rsa_public_key(server_cert)
# The _RSAPublicKey must be 'wrapped' using the negotiated GSSAPI mechanism and send to the server along with
# the final SPNEGO token. This step of the CredSSP protocol is designed to thwart 'man-in-the-middle' attacks
# Build and encrypt the response to the server
ts_request = TSRequest()
ts_request['negoTokens'] = context_generator.send(challenge_token)
public_key_encrypted, signature = context.wrap_message(public_key)
ts_request['pubKeyAuth'] = signature + public_key_encrypted
tls_credssp.send(ts_request.getData())
enc_type3 = tls_credssp.bio_read(8192)
http_auth_response = yield self._set_credssp_header(response.request, enc_type3)
# TLS decrypt the response, then ASN decode and check the error code
auth_response = self._get_credssp_header(http_auth_response)
if not auth_response or auth_response is None:
raise Exception("The remote host rejected the challenge response")
tls_credssp.bio_write(auth_response)
ts_request = TSRequest()
ts_request.fromString(tls_credssp.recv(8192))
# TODO: Validate server cert?
#a = ts_request['pubKeyAuth']
# print ":".join("{:02x}".format(ord(c)) for c in a)
# 4. Send the Credentials to be delegated, these are encrypted with both NTLM v2 and then by TLS
tsp = TSPasswordCreds()
tsp['domain'] = self.domain
tsp['username'] = self.username
tsp['password'] = self.password
tsc = TSCredentials()
tsc['type'] = 1
tsc['credentials'] = tsp.getData()
ts_request = TSRequest()
ts_request['authInfo'] = context.wrap_message(tsc.getData())
tls_credssp.send(ts_request.getData())
final = tls_credssp.bio_read(8192)
http_response = yield self._set_credssp_header(response.request, final)
if http_response.status_code == 401:
raise Exception('Authentication Failed')