397 lines
20 KiB
Python
397 lines
20 KiB
Python
|
# This library is free software: you can redistribute it and/or
|
||
|
|
# modify it under the terms of the GNU Lesser General Public
|
||
|
|
# License as published by the Free Software Foundation, either
|
||
|
|
# version 3 of the License, or (at your option) any later version.
|
||
|
|
|
||
|
|
# This library is distributed in the hope that it will be useful,
|
||
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
# Lesser General Public License for more details.
|
||
|
|
|
||
|
|
# You should have received a copy of the GNU Lesser General Public
|
||
|
|
# License along with this library. If not, see <http://www.gnu.org/licenses/> or <http://www.gnu.org/licenses/lgpl.txt>.
|
||
|
|
|
||
|
|
import base64
|
||
|
|
import calendar
|
||
|
|
import hashlib
|
||
|
|
import hmac
|
||
|
|
import os
|
||
|
|
import struct
|
||
|
|
import time
|
||
|
|
import ntlm_auth.compute_hash as comphash
|
||
|
|
import ntlm_auth.compute_keys as compkeys
|
||
|
|
from ntlm_auth import des
|
||
|
|
from ntlm_auth.constants import NegotiateFlags, AvFlags
|
||
|
|
from ntlm_auth.gss_channel_bindings import GssChannelBindingsStruct
|
||
|
|
from ntlm_auth.target_info import TargetInfo
|
||
|
|
|
||
|
|
class ComputeResponse():
|
||
|
|
"""
|
||
|
|
Constructor for the response computations. This class will compute the various
|
||
|
|
nt and lm challenge responses.
|
||
|
|
|
||
|
|
:param user_name: The user name of the user we are trying to authenticate with
|
||
|
|
:param password: The password of the user we are trying to authenticate with
|
||
|
|
:param domain_name: The domain name of the user account we are authenticated with, default is None
|
||
|
|
:param challenge_message: A ChallengeMessage object that was received from the server after the negotiate_message
|
||
|
|
:param ntlm_compatibility: The Lan Manager Compatibility Level, used to determine what NTLM auth version to use, see Ntlm in ntlm.py for more details
|
||
|
|
"""
|
||
|
|
def __init__(self, user_name, password, domain_name, challenge_message, ntlm_compatibility):
|
||
|
|
self._user_name = user_name
|
||
|
|
self._password = password
|
||
|
|
self._domain_name = domain_name
|
||
|
|
self._challenge_message = challenge_message
|
||
|
|
self._negotiate_flags = challenge_message.negotiate_flags
|
||
|
|
self._server_challenge = challenge_message.server_challenge
|
||
|
|
self._server_target_info = challenge_message.target_info
|
||
|
|
self._ntlm_compatibility = ntlm_compatibility
|
||
|
|
self._client_challenge = os.urandom(8)
|
||
|
|
|
||
|
|
def get_lm_challenge_response(self):
|
||
|
|
"""
|
||
|
|
[MS-NLMP] v28.0 2016-07-14
|
||
|
|
|
||
|
|
3.3.1 - NTLM v1 Authentication
|
||
|
|
3.3.2 - NTLM v2 Authentication
|
||
|
|
|
||
|
|
This method returns the LmChallengeResponse key based on the ntlm_compatibility chosen
|
||
|
|
and the target_info supplied by the CHALLENGE_MESSAGE. It is quite different from what
|
||
|
|
is set in the document as it combines the NTLMv1, NTLM2 and NTLMv2 methods into one
|
||
|
|
and calls separate methods based on the ntlm_compatibility flag chosen.
|
||
|
|
|
||
|
|
:return: response (LmChallengeResponse) - The LM response to the server challenge. Computed by the client
|
||
|
|
"""
|
||
|
|
if self._negotiate_flags & NegotiateFlags.NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY and self._ntlm_compatibility < 3:
|
||
|
|
response = ComputeResponse._get_LMv1_with_session_security_response(self._client_challenge)
|
||
|
|
|
||
|
|
elif 0 <= self._ntlm_compatibility <= 1:
|
||
|
|
response = ComputeResponse._get_LMv1_response(self._password, self._server_challenge)
|
||
|
|
elif self._ntlm_compatibility == 2:
|
||
|
|
# Based on the compatibility level we don't want to use LM responses, ignore the session_base_key as it is returned in nt
|
||
|
|
response, ignore_key = ComputeResponse._get_NTLMv1_response(self._password, self._server_challenge)
|
||
|
|
else:
|
||
|
|
"""
|
||
|
|
[MS-NLMP] v28.0 page 45 - 2016-07-14
|
||
|
|
|
||
|
|
3.1.5.12 Client Received a CHALLENGE_MESSAGE from the Server
|
||
|
|
If NTLMv2 authentication is used and the CHALLENGE_MESSAGE TargetInfo field has an MsvAvTimestamp present,
|
||
|
|
the client SHOULD NOT send the LmChallengeResponse and SHOULD send Z(24) instead.
|
||
|
|
"""
|
||
|
|
|
||
|
|
response = ComputeResponse._get_LMv2_response(self._user_name, self._password, self._domain_name,
|
||
|
|
self._server_challenge,
|
||
|
|
self._client_challenge)
|
||
|
|
if self._server_target_info is not None:
|
||
|
|
timestamp = self._server_target_info[TargetInfo.MSV_AV_TIMESTAMP]
|
||
|
|
if timestamp is not None:
|
||
|
|
response = b'\0' * 24
|
||
|
|
|
||
|
|
return response
|
||
|
|
|
||
|
|
def get_nt_challenge_response(self, lm_challenge_response, server_certificate_hash):
|
||
|
|
"""
|
||
|
|
[MS-NLMP] v28.0 2016-07-14
|
||
|
|
|
||
|
|
3.3.1 - NTLM v1 Authentication
|
||
|
|
3.3.2 - NTLM v2 Authentication
|
||
|
|
|
||
|
|
This method returns the NtChallengeResponse key based on the ntlm_compatibility chosen
|
||
|
|
and the target_info supplied by the CHALLENGE_MESSAGE. It is quite different from what
|
||
|
|
is set in the document as it combines the NTLMv1, NTLM2 and NTLMv2 methods into one
|
||
|
|
and calls separate methods based on the ntlm_compatibility value chosen.
|
||
|
|
|
||
|
|
:param lm_challenge_response: The LmChallengeResponse calculated beforeand, used to get the key_exchange_key value
|
||
|
|
:param server_certificate_hash: The SHA256 hash of the server certificate (DER encoded) NTLM is authenticated to.
|
||
|
|
Used in Channel Binding Tokens if present, default value is None. See
|
||
|
|
AuthenticateMessage in messages.py for more details
|
||
|
|
:return response: (NtChallengeResponse) - The NT response to the server challenge. Computed by the client
|
||
|
|
:return session_base_key: (SessionBaseKey) - A session key calculated from the user password challenge
|
||
|
|
:return target_info: (AV_PAIR) - The AV_PAIR structure used in the nt_challenge calculations
|
||
|
|
"""
|
||
|
|
if self._negotiate_flags & NegotiateFlags.NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY and self._ntlm_compatibility < 3:
|
||
|
|
# The compatibility level is less than 3 which means it doesn't support NTLMv2 but we want extended security so use NTLM2 which is different from NTLMv2
|
||
|
|
# [MS-NLMP] - 3.3.1 NTLMv1 Authentication
|
||
|
|
response, session_base_key = ComputeResponse._get_NTLM2_response(self._password, self._server_challenge, self._client_challenge)
|
||
|
|
key_exchange_key = compkeys._get_exchange_key_ntlm_v1(self._negotiate_flags, session_base_key,
|
||
|
|
self._server_challenge, lm_challenge_response,
|
||
|
|
comphash._lmowfv1(self._password))
|
||
|
|
target_info = None
|
||
|
|
|
||
|
|
elif 0 <= self._ntlm_compatibility < 3:
|
||
|
|
response, session_base_key = ComputeResponse._get_NTLMv1_response(self._password, self._server_challenge)
|
||
|
|
key_exchange_key = compkeys._get_exchange_key_ntlm_v1(self._negotiate_flags, session_base_key,
|
||
|
|
self._server_challenge, lm_challenge_response,
|
||
|
|
comphash._lmowfv1(self._password))
|
||
|
|
target_info = None
|
||
|
|
else:
|
||
|
|
if self._server_target_info is None:
|
||
|
|
target_info = TargetInfo()
|
||
|
|
else:
|
||
|
|
target_info = self._server_target_info
|
||
|
|
|
||
|
|
if target_info[TargetInfo.MSV_AV_TIMESTAMP] is None:
|
||
|
|
timestamp = get_windows_timestamp()
|
||
|
|
else:
|
||
|
|
timestamp = target_info[TargetInfo.MSV_AV_TIMESTAMP][1]
|
||
|
|
|
||
|
|
# [MS-NLMP] If the CHALLENGE_MESSAGE TargetInfo field has an MsvAvTimestamp present, the client SHOULD provide a MIC
|
||
|
|
target_info[TargetInfo.MSV_AV_FLAGS] = struct.pack("<L", AvFlags.MIC_PROVIDED)
|
||
|
|
|
||
|
|
if server_certificate_hash != None:
|
||
|
|
channel_bindings_hash = ComputeResponse._get_channel_bindings_value(server_certificate_hash)
|
||
|
|
target_info[TargetInfo.MSV_AV_CHANNEL_BINDINGS] = channel_bindings_hash
|
||
|
|
|
||
|
|
response, session_base_key = ComputeResponse._get_NTLMv2_response(self._user_name, self._password, self._domain_name,
|
||
|
|
self._server_challenge, self._client_challenge, timestamp, target_info)
|
||
|
|
|
||
|
|
key_exchange_key = compkeys._get_exchange_key_ntlm_v2(session_base_key)
|
||
|
|
|
||
|
|
return response, key_exchange_key, target_info
|
||
|
|
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _get_LMv1_response(password, server_challenge):
|
||
|
|
"""
|
||
|
|
[MS-NLMP] v28.0 2016-07-14
|
||
|
|
|
||
|
|
2.2.2.3 LM_RESPONSE
|
||
|
|
The LM_RESPONSE structure defines the NTLM v1 authentication LmChallengeResponse
|
||
|
|
in the AUTHENTICATE_MESSAGE. This response is used only when NTLM v1
|
||
|
|
authentication is configured.
|
||
|
|
|
||
|
|
:param password: The password of the user we are trying to authenticate with
|
||
|
|
:param server_challenge: A random 8-byte response generated by the server in the CHALLENGE_MESSAGE
|
||
|
|
:return response: LmChallengeResponse to the server challenge
|
||
|
|
"""
|
||
|
|
lm_hash = comphash._lmowfv1(password)
|
||
|
|
response = ComputeResponse._calc_resp(lm_hash, server_challenge)
|
||
|
|
|
||
|
|
return response
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _get_LMv1_with_session_security_response(client_challenge):
|
||
|
|
"""
|
||
|
|
[MS-NLMP] v28.0 2016-07-14
|
||
|
|
|
||
|
|
2.2.2.3 LM_RESPONSE
|
||
|
|
The LM_RESPONSE structure defines the NTLM v1 authentication LmChallengeResponse
|
||
|
|
in the AUTHENTICATE_MESSAGE. This response is used only when NTLM v1
|
||
|
|
authentication is configured and NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY is flages.
|
||
|
|
|
||
|
|
:param client_challenge: A random 8-byte response generated by the client for the AUTHENTICATE_MESSAGE
|
||
|
|
:return response: LmChallengeResponse to the server challenge
|
||
|
|
"""
|
||
|
|
|
||
|
|
response = client_challenge + b'\0' * 16
|
||
|
|
|
||
|
|
return response
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _get_LMv2_response(user_name, password, domain_name, server_challenge, client_challenge):
|
||
|
|
"""
|
||
|
|
[MS-NLMP] v28.0 2016-07-14
|
||
|
|
|
||
|
|
2.2.2.4 LMv2_RESPONSE
|
||
|
|
The LMv2_RESPONSE structure defines the NTLM v2 authentication LmChallengeResponse
|
||
|
|
in the AUTHENTICATE_MESSAGE. This response is used only when NTLM v2
|
||
|
|
authentication is configured.
|
||
|
|
|
||
|
|
:param user_name: The user name of the user we are trying to authenticate with
|
||
|
|
:param password: The password of the user we are trying to authenticate with
|
||
|
|
:param domain_name: The domain name of the user account we are authenticated with
|
||
|
|
:param server_challenge: A random 8-byte response generated by the server in the CHALLENGE_MESSAGE
|
||
|
|
:param client_challenge: A random 8-byte response generated by the client for the AUTHENTICATE_MESSAGE
|
||
|
|
:return response: LmChallengeResponse to the server challenge
|
||
|
|
"""
|
||
|
|
nt_hash = comphash._ntowfv2(user_name, password, domain_name)
|
||
|
|
lm_hash = hmac.new(nt_hash, (server_challenge + client_challenge)).digest()
|
||
|
|
response = lm_hash + client_challenge
|
||
|
|
|
||
|
|
return response
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _get_NTLMv1_response(password, server_challenge):
|
||
|
|
"""
|
||
|
|
[MS-NLMP] v28.0 2016-07-14
|
||
|
|
|
||
|
|
2.2.2.6 NTLM v1 Response: NTLM_RESPONSE
|
||
|
|
The NTLM_RESPONSE strucutre defines the NTLM v1 authentication NtChallengeResponse
|
||
|
|
in the AUTHENTICATE_MESSAGE. This response is only used when NTLM v1 authentication
|
||
|
|
is configured.
|
||
|
|
|
||
|
|
:param password: The password of the user we are trying to authenticate with
|
||
|
|
:param server_challenge: A random 8-byte response generated by the server in the CHALLENGE_MESSAGE
|
||
|
|
:return response: NtChallengeResponse to the server_challenge
|
||
|
|
:return session_base_key: A session key calculated from the user password challenge
|
||
|
|
"""
|
||
|
|
ntlm_hash = comphash._ntowfv1(password)
|
||
|
|
response = ComputeResponse._calc_resp(ntlm_hash, server_challenge)
|
||
|
|
|
||
|
|
session_base_key = hashlib.new('md4', ntlm_hash).digest()
|
||
|
|
|
||
|
|
return response, session_base_key
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _get_NTLM2_response(password, server_challenge, client_challenge):
|
||
|
|
"""
|
||
|
|
[MS-NLMP] v28.0 2016-07-14
|
||
|
|
|
||
|
|
This name is really misleading as it isn't NTLM v2 authentication rather
|
||
|
|
This authentication is only used when the ntlm_compatibility level is set
|
||
|
|
to a value < 3 (No NTLMv2 auth) but the NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY
|
||
|
|
flag is set in the negotiate flags section. The documentation for computing this
|
||
|
|
value is on page 56 under section 3.3.1 NTLM v1 Authentication
|
||
|
|
|
||
|
|
:param password: The password of the user we are trying to authenticate with
|
||
|
|
:param server_challenge: A random 8-byte response generated by the server in the CHALLENGE_MESSAGE
|
||
|
|
:param client_challenge: A random 8-byte response generated by the client for the AUTHENTICATE_MESSAGE
|
||
|
|
:return response: NtChallengeResponse to the server_challenge
|
||
|
|
:return session_base_key: A session key calculated from the user password challenge
|
||
|
|
"""
|
||
|
|
ntlm_hash = comphash._ntowfv1(password)
|
||
|
|
nt_session_hash = hashlib.md5(server_challenge + client_challenge).digest()[:8]
|
||
|
|
response = ComputeResponse._calc_resp(ntlm_hash, nt_session_hash[0:8])
|
||
|
|
|
||
|
|
session_base_key = hashlib.new('md4', ntlm_hash).digest()
|
||
|
|
|
||
|
|
return response, session_base_key
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _get_NTLMv2_response(user_name, password, domain_name, server_challenge, client_challenge, timestamp, target_info):
|
||
|
|
"""
|
||
|
|
[MS-NLMP] v28.0 2016-07-14
|
||
|
|
|
||
|
|
2.2.2.8 NTLM V2 Response: NTLMv2_RESPONSE
|
||
|
|
The NTLMv2_RESPONSE strucutre defines the NTLMv2 authentication NtChallengeResponse
|
||
|
|
in the AUTHENTICATE_MESSAGE. This response is used only when NTLMv2 authentication
|
||
|
|
is configured.
|
||
|
|
|
||
|
|
The guide on how this is computed is in 3.3.2 NTLM v2 Authentication.
|
||
|
|
|
||
|
|
:param user_name: The user name of the user we are trying to authenticate with
|
||
|
|
:param password: The password of the user we are trying to authenticate with
|
||
|
|
:param domain_name: The domain name of the user account we are authenticated with
|
||
|
|
:param server_challenge: A random 8-byte response generated by the server in the CHALLENGE_MESSAGE
|
||
|
|
:param client_challenge: A random 8-byte response generated by the client for the AUTHENTICATE_MESSAGE
|
||
|
|
:param timestamp: An 8-byte timestamp in windows format, 100 nanoseconds since 1601-01-01
|
||
|
|
:param target_info: The target_info structure from the CHALLENGE_MESSAGE with the CBT attached if required
|
||
|
|
:return response: NtChallengeResponse to the server_challenge
|
||
|
|
:return session_base_key: A session key calculated from the user password challenge
|
||
|
|
"""
|
||
|
|
|
||
|
|
nt_hash = comphash._ntowfv2(user_name, password, domain_name)
|
||
|
|
temp = ComputeResponse._get_NTLMv2_temp(timestamp, client_challenge, target_info)
|
||
|
|
nt_proof_str = hmac.new(nt_hash, (server_challenge + temp)).digest()
|
||
|
|
response = nt_proof_str + temp
|
||
|
|
|
||
|
|
session_base_key = hmac.new(nt_hash, nt_proof_str).digest()
|
||
|
|
|
||
|
|
return response, session_base_key
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _get_NTLMv2_temp(timestamp, client_challenge, target_info):
|
||
|
|
"""
|
||
|
|
[MS-NLMP] v28.0 2016-07-14
|
||
|
|
|
||
|
|
2.2.2.7 NTLMv2_CLIENT_CHALLENGE - variable length
|
||
|
|
The NTLMv2_CLIENT_CHALLENGE structure defines the client challenge in
|
||
|
|
the AUTHENTICATE_MESSAGE. This structure is used only when NTLM v2
|
||
|
|
authentication is configured and is transported in the NTLMv2_RESPONSE
|
||
|
|
structure.
|
||
|
|
|
||
|
|
The method to create this structure is defined in 3.3.2 NTLMv2 Authentication.
|
||
|
|
In this method this variable is known as the temp value. The target_info variable
|
||
|
|
corresponds to the ServerName variable used in that documentation. This is in
|
||
|
|
reality a lot more than just the ServerName and contains the AV_PAIRS structure
|
||
|
|
we need to transport with the message like Channel Binding tokens and others.
|
||
|
|
By default this will be the target_info returned from the CHALLENGE_MESSAGE plus
|
||
|
|
MSV_AV_CHANNEL_BINDINGS if specified otherwise it is a new target_info set with
|
||
|
|
MSV_AV_TIMESTAMP to the current time.
|
||
|
|
|
||
|
|
:param timestamp: An 8-byte timestamp in windows format, 100 nanoseconds since 1601-01-01
|
||
|
|
:param client_challenge: A random 8-byte response generated by the client for the AUTHENTICATE_MESSAGE
|
||
|
|
:param target_info: The target_info structure from the CHALLENGE_MESSAGE with the CBT attached if required
|
||
|
|
:return temp: The CLIENT_CHALLENGE structure that will be added to the NtChallengeResponse structure
|
||
|
|
"""
|
||
|
|
resp_type = b'\1'
|
||
|
|
hi_resp_type = b'\1'
|
||
|
|
reserved1 = b'\0' * 2
|
||
|
|
reserved2 = b'\0' * 4
|
||
|
|
reserved3 = b'\0' * 4
|
||
|
|
reserved4 = b'\0' * 4 # This byte is not in the structure defined in 2.2.2.7 but is in the computation guide, works with it present
|
||
|
|
|
||
|
|
temp = resp_type + hi_resp_type + reserved1 + \
|
||
|
|
reserved2 + \
|
||
|
|
timestamp + \
|
||
|
|
client_challenge + \
|
||
|
|
reserved3 + \
|
||
|
|
target_info.get_data() + reserved4
|
||
|
|
|
||
|
|
return temp
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _calc_resp(password_hash, server_challenge):
|
||
|
|
"""
|
||
|
|
Generate the LM response given a 16-byte password hash and the challenge
|
||
|
|
from the CHALLENGE_MESSAGE
|
||
|
|
|
||
|
|
:param password_hash: A 16-byte password hash
|
||
|
|
:param server_challenge: A random 8-byte response generated by the server in the CHALLENGE_MESSAGE
|
||
|
|
:return res: A 24-byte buffer to contain the LM response upon return
|
||
|
|
"""
|
||
|
|
|
||
|
|
# padding with zeros to make the hash 21 bytes long
|
||
|
|
password_hash += b'\0' * (21 - len(password_hash))
|
||
|
|
|
||
|
|
res = b''
|
||
|
|
dobj = des.DES(password_hash[0:7])
|
||
|
|
res = res + dobj.encrypt(server_challenge[0:8])
|
||
|
|
|
||
|
|
dobj = des.DES(password_hash[7:14])
|
||
|
|
res = res + dobj.encrypt(server_challenge[0:8])
|
||
|
|
|
||
|
|
dobj = des.DES(password_hash[14:21])
|
||
|
|
res = res + dobj.encrypt(server_challenge[0:8])
|
||
|
|
return res
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _get_channel_bindings_value(server_certificate_hash):
|
||
|
|
"""
|
||
|
|
https://msdn.microsoft.com/en-us/library/windows/desktop/dd919963%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
|
||
|
|
https://blogs.msdn.microsoft.com/openspecification/2013/03/26/ntlm-and-channel-binding-hash-aka-extended-protection-for-authentication/
|
||
|
|
|
||
|
|
Get's the MD5 hash of the gss_channel_bindings_struct to add to the AV_PAIR MSV_AV_CHANNEL_BINDINGS.
|
||
|
|
This method takes in the SHA256 hash (Hash of the DER encoded certificate of the server we are connecting to)
|
||
|
|
and add's it to the gss_channel_bindings_struct. It then gets the MD5 hash and converts this to a
|
||
|
|
byte array in preparation of adding it to the AV_PAIR structure.
|
||
|
|
|
||
|
|
:param server_certificate_hash: The SHA256 hash of the server certificate (DER encoded) NTLM is authenticated to
|
||
|
|
:return channel_bindings: An MD5 hash of the gss_channel_bindings_struct to add to the AV_PAIR MsvChannelBindings
|
||
|
|
"""
|
||
|
|
# Channel Binding Tokens support, used for NTLMv2
|
||
|
|
# Decode the SHA256 certificate hash
|
||
|
|
certificate_digest = base64.b16decode(server_certificate_hash)
|
||
|
|
|
||
|
|
# Initialise the GssChannelBindingsStruct and add the certificate_digest to the application_data field
|
||
|
|
gss_channel_bindings = GssChannelBindingsStruct()
|
||
|
|
gss_channel_bindings[gss_channel_bindings.APPLICATION_DATA] = 'tls-server-end-point:'.encode() + certificate_digest
|
||
|
|
|
||
|
|
# Get the gss_channel_bindings_struct and create an MD5 hash
|
||
|
|
channel_bindings_struct_data = gss_channel_bindings.get_data()
|
||
|
|
channel_bindings_hash = hashlib.md5(channel_bindings_struct_data).hexdigest()
|
||
|
|
|
||
|
|
try:
|
||
|
|
cbt_value = bytearray.fromhex(channel_bindings_hash)
|
||
|
|
except TypeError:
|
||
|
|
# Work-around for Python 2.6 bug
|
||
|
|
cbt_value = bytearray.fromhex(unicode(channel_bindings_hash))
|
||
|
|
|
||
|
|
channel_bindings = bytes(cbt_value)
|
||
|
|
return channel_bindings
|
||
|
|
|
||
|
|
|
||
|
|
def get_windows_timestamp():
|
||
|
|
# Get Windows Date time, 100 nanoseconds since 1601-01-01 in a 64 bit structure
|
||
|
|
timestamp = struct.pack('<q', (116444736000000000 + calendar.timegm(time.gmtime()) * 10000000))
|
||
|
|
|
||
|
|
return timestamp
|