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# Copyright: (c) 2018, Jordan Borean (@jborean93) <jborean93@gmail.com> # MIT License (see LICENSE or https://opensource.org/licenses/MIT) import base64 import struct from ntlm_auth.constants import NegotiateFlags from ntlm_auth.exceptions import NoAuthContextError from ntlm_auth.messages import AuthenticateMessage, ChallengeMessage, \ NegotiateMessage from ntlm_auth.session_security import SessionSecurity class NtlmContext(object): def __init__(self, username, password, domain=None, workstation=None, cbt_data=None, ntlm_compatibility=3): r""" Initialises a NTLM context to use when authenticating using the NTLM protocol. Initialises the NTLM context to use when sending and receiving messages to and from the server. You should be using this object as it supports NTLMv2 authenticate and it easier to use than before. It also brings in the ability to use signing and sealing with session_security and generate a MIC structure. :param username: The username to authenticate with :param password: The password for the username :param domain: The domain part of the username (None if n/a) :param workstation: The localworkstation (None if n/a) :param cbt_data: A GssChannelBindingsStruct or None to bind channel data with the auth process :param ntlm_compatibility: (Default 3) The Lan Manager Compatibility Level to use with the auth message This is set by an Administrator in the registry key 'HKLM\SYSTEM\CurrentControlSet\Control\Lsa\LmCompatibilityLevel' The values correspond to the following; 0 : LM and NTLMv1 1 : LM, NTLMv1 and NTLMv1 with Extended Session Security 2 : NTLMv1 and NTLMv1 with Extended Session Security 3-5 : NTLMv2 Only Note: Values 3 to 5 are no different from a client perspective """ self.username = username self.password = password self.domain = domain self.workstation = workstation self.cbt_data = cbt_data self._server_certificate_hash = None # deprecated for backwards compat self.ntlm_compatibility = ntlm_compatibility self.complete = False self.session_key = None # Setting up our flags so the challenge message returns the target info # block if supported self.negotiate_flags = NegotiateFlags.NTLMSSP_NEGOTIATE_TARGET_INFO | \ NegotiateFlags.NTLMSSP_NEGOTIATE_128 | \ NegotiateFlags.NTLMSSP_NEGOTIATE_56 | \ NegotiateFlags.NTLMSSP_NEGOTIATE_UNICODE | \ NegotiateFlags.NTLMSSP_NEGOTIATE_VERSION | \ NegotiateFlags.NTLMSSP_NEGOTIATE_KEY_EXCH | \ NegotiateFlags.NTLMSSP_NEGOTIATE_ALWAYS_SIGN | \ NegotiateFlags.NTLMSSP_NEGOTIATE_SIGN | \ NegotiateFlags.NTLMSSP_NEGOTIATE_SEAL # Setting the message types based on the ntlm_compatibility level self._set_ntlm_compatibility_flags(self.ntlm_compatibility) self._negotiate_message = None self._challenge_message = None self._authenticate_message = None self._session_security = None def step(self, input_token=None): if self._negotiate_message is None: self._negotiate_message = NegotiateMessage(self.negotiate_flags, self.domain, self.workstation) return self._negotiate_message.get_data() else: self._challenge_message = ChallengeMessage(input_token) self._authenticate_message = AuthenticateMessage( self.username, self.password, self.domain, self.workstation, self._challenge_message, self.ntlm_compatibility, server_certificate_hash=self._server_certificate_hash, cbt_data=self.cbt_data ) self._authenticate_message.add_mic(self._negotiate_message, self._challenge_message) flag_bytes = self._authenticate_message.negotiate_flags flags = struct.unpack("<I", flag_bytes)[0] if flags & NegotiateFlags.NTLMSSP_NEGOTIATE_SEAL or \ flags & NegotiateFlags.NTLMSSP_NEGOTIATE_SIGN: self.session_key = self._authenticate_message.exported_session_key self._session_security = SessionSecurity( flags, self._authenticate_message.exported_session_key ) self.complete = True return self._authenticate_message.get_data() def wrap(self, data): if self._session_security is None: raise NoAuthContextError("Cannot wrap data as no security context " "has been established") data, header = self._session_security.wrap(data) return header + data def unwrap(self, data): if self._session_security is None: raise NoAuthContextError("Cannot unwrap data as no security " "context has been established") header = data[0:16] data = data[16:] message = self._session_security.unwrap(data, header) return message def _set_ntlm_compatibility_flags(self, ntlm_compatibility): if (ntlm_compatibility >= 0) and (ntlm_compatibility <= 5): if ntlm_compatibility == 0: self.negotiate_flags |= \ NegotiateFlags.NTLMSSP_NEGOTIATE_NTLM | \ NegotiateFlags.NTLMSSP_NEGOTIATE_LM_KEY elif ntlm_compatibility == 1: self.negotiate_flags |= \ NegotiateFlags.NTLMSSP_NEGOTIATE_NTLM | \ NegotiateFlags.NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY else: self.negotiate_flags |= \ NegotiateFlags.NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY else: raise Exception("Unknown ntlm_compatibility level - " "expecting value between 0 and 5") # Deprecated in favour of NtlmContext - this current class is heavily geared # towards a HTTP API which is not always the case with NTLM. This is currently # just a thin wrapper over NtlmContext and will be removed in future ntlm-auth # versions class Ntlm(object): def __init__(self, ntlm_compatibility=3): self._context = NtlmContext(None, None, ntlm_compatibility=ntlm_compatibility) self._challenge_token = None @property def negotiate_flags(self): return self._context.negotiate_flags @negotiate_flags.setter def negotiate_flags(self, value): self._context.negotiate_flags = value @property def ntlm_compatibility(self): return self._context.ntlm_compatibility @ntlm_compatibility.setter def ntlm_compatibility(self, value): self._context.ntlm_compatibility = value @property def negotiate_message(self): return self._context._negotiate_message @negotiate_message.setter def negotiate_message(self, value): self._context._negotiate_message = value @property def challenge_message(self): return self._context._challenge_message @challenge_message.setter def challenge_message(self, value): self._context._challenge_message = value @property def authenticate_message(self): return self._context._authenticate_message @authenticate_message.setter def authenticate_message(self, value): self._context._authenticate_message = value @property def session_security(self): return self._context._session_security @session_security.setter def session_security(self, value): self._context._session_security = value def create_negotiate_message(self, domain_name=None, workstation=None): self._context.domain = domain_name self._context.workstation = workstation msg = self._context.step() return base64.b64encode(msg) def parse_challenge_message(self, msg2): self._challenge_token = base64.b64decode(msg2) def create_authenticate_message(self, user_name, password, domain_name=None, workstation=None, server_certificate_hash=None): self._context.username = user_name self._context.password = password self._context.domain = domain_name self._context.workstation = workstation self._context._server_certificate_hash = server_certificate_hash msg = self._context.step(self._challenge_token) return base64.b64encode(msg)