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venv/Lib/site-packages/ldap3/utils/ntlm.py Normal file
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"""
"""
# Created on 2015.04.02
#
# Author: Giovanni Cannata
#
# Copyright 2015 - 2020 Giovanni Cannata
#
# This file is part of ldap3.
#
# ldap3 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.
#
# ldap3 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 ldap3 in the COPYING and COPYING.LESSER files.
# If not, see <http://www.gnu.org/licenses/>.
# NTLMv2 authentication as per [MS-NLMP] (https://msdn.microsoft.com/en-us/library/cc236621.aspx)
from struct import pack, unpack
from platform import system, version
from socket import gethostname
from time import time
import hmac
import hashlib
import binascii
from os import urandom
try:
from locale import getpreferredencoding
oem_encoding = getpreferredencoding()
except Exception:
oem_encoding = 'utf-8'
from ..protocol.formatters.formatters import format_ad_timestamp
NTLM_SIGNATURE = b'NTLMSSP\x00'
NTLM_MESSAGE_TYPE_NTLM_NEGOTIATE = 1
NTLM_MESSAGE_TYPE_NTLM_CHALLENGE = 2
NTLM_MESSAGE_TYPE_NTLM_AUTHENTICATE = 3
FLAG_NEGOTIATE_56 = 31 # W
FLAG_NEGOTIATE_KEY_EXCH = 30 # V
FLAG_NEGOTIATE_128 = 29 # U
FLAG_NEGOTIATE_VERSION = 25 # T
FLAG_NEGOTIATE_TARGET_INFO = 23 # S
FLAG_REQUEST_NOT_NT_SESSION_KEY = 22 # R
FLAG_NEGOTIATE_IDENTIFY = 20 # Q
FLAG_NEGOTIATE_EXTENDED_SESSIONSECURITY = 19 # P
FLAG_TARGET_TYPE_SERVER = 17 # O
FLAG_TARGET_TYPE_DOMAIN = 16 # N
FLAG_NEGOTIATE_ALWAYS_SIGN = 15 # M
FLAG_NEGOTIATE_OEM_WORKSTATION_SUPPLIED = 13 # L
FLAG_NEGOTIATE_OEM_DOMAIN_SUPPLIED = 12 # K
FLAG_NEGOTIATE_ANONYMOUS = 11 # J
FLAG_NEGOTIATE_NTLM = 9 # H
FLAG_NEGOTIATE_LM_KEY = 7 # G
FLAG_NEGOTIATE_DATAGRAM = 6 # F
FLAG_NEGOTIATE_SEAL = 5 # E
FLAG_NEGOTIATE_SIGN = 4 # D
FLAG_REQUEST_TARGET = 2 # C
FLAG_NEGOTIATE_OEM = 1 # B
FLAG_NEGOTIATE_UNICODE = 0 # A
FLAG_TYPES = [FLAG_NEGOTIATE_56,
FLAG_NEGOTIATE_KEY_EXCH,
FLAG_NEGOTIATE_128,
FLAG_NEGOTIATE_VERSION,
FLAG_NEGOTIATE_TARGET_INFO,
FLAG_REQUEST_NOT_NT_SESSION_KEY,
FLAG_NEGOTIATE_IDENTIFY,
FLAG_NEGOTIATE_EXTENDED_SESSIONSECURITY,
FLAG_TARGET_TYPE_SERVER,
FLAG_TARGET_TYPE_DOMAIN,
FLAG_NEGOTIATE_ALWAYS_SIGN,
FLAG_NEGOTIATE_OEM_WORKSTATION_SUPPLIED,
FLAG_NEGOTIATE_OEM_DOMAIN_SUPPLIED,
FLAG_NEGOTIATE_ANONYMOUS,
FLAG_NEGOTIATE_NTLM,
FLAG_NEGOTIATE_LM_KEY,
FLAG_NEGOTIATE_DATAGRAM,
FLAG_NEGOTIATE_SEAL,
FLAG_NEGOTIATE_SIGN,
FLAG_REQUEST_TARGET,
FLAG_NEGOTIATE_OEM,
FLAG_NEGOTIATE_UNICODE]
AV_END_OF_LIST = 0
AV_NETBIOS_COMPUTER_NAME = 1
AV_NETBIOS_DOMAIN_NAME = 2
AV_DNS_COMPUTER_NAME = 3
AV_DNS_DOMAIN_NAME = 4
AV_DNS_TREE_NAME = 5
AV_FLAGS = 6
AV_TIMESTAMP = 7
AV_SINGLE_HOST_DATA = 8
AV_TARGET_NAME = 9
AV_CHANNEL_BINDINGS = 10
AV_TYPES = [AV_END_OF_LIST,
AV_NETBIOS_COMPUTER_NAME,
AV_NETBIOS_DOMAIN_NAME,
AV_DNS_COMPUTER_NAME,
AV_DNS_DOMAIN_NAME,
AV_DNS_TREE_NAME,
AV_FLAGS,
AV_TIMESTAMP,
AV_SINGLE_HOST_DATA,
AV_TARGET_NAME,
AV_CHANNEL_BINDINGS]
AV_FLAG_CONSTRAINED = 0
AV_FLAG_INTEGRITY = 1
AV_FLAG_TARGET_SPN_UNTRUSTED = 2
AV_FLAG_TYPES = [AV_FLAG_CONSTRAINED,
AV_FLAG_INTEGRITY,
AV_FLAG_TARGET_SPN_UNTRUSTED]
def pack_windows_version(debug=False):
if debug:
if system().lower() == 'windows':
try:
major_release, minor_release, build = version().split('.')
major_release = int(major_release)
minor_release = int(minor_release)
build = int(build)
except Exception:
major_release = 5
minor_release = 1
build = 2600
else:
major_release = 5
minor_release = 1
build = 2600
else:
major_release = 0
minor_release = 0
build = 0
return pack('<B', major_release) + \
pack('<B', minor_release) + \
pack('<H', build) + \
pack('<B', 0) + \
pack('<B', 0) + \
pack('<B', 0) + \
pack('<B', 15)
def unpack_windows_version(version_message):
if len(version_message) != 8:
raise ValueError('version field must be 8 bytes long')
if str is bytes: # Python 2
return (unpack('<B', version_message[0])[0],
unpack('<B', version_message[1])[0],
unpack('<H', version_message[2:4])[0],
unpack('<B', version_message[7])[0])
else: # Python 3
return (int(version_message[0]),
int(version_message[1]),
int(unpack('<H', version_message[2:4])[0]),
int(version_message[7]))
class NtlmClient(object):
def __init__(self, domain, user_name, password):
self.client_config_flags = 0
self.exported_session_key = None
self.negotiated_flags = None
self.user_name = user_name
self.user_domain = domain
self.no_lm_response_ntlm_v1 = None
self.client_blocked = False
self.client_block_exceptions = []
self.client_require_128_bit_encryption = None
self.max_life_time = None
self.client_signing_key = None
self.client_sealing_key = None
self.sequence_number = None
self.server_sealing_key = None
self.server_signing_key = None
self.integrity = False
self.replay_detect = False
self.sequence_detect = False
self.confidentiality = False
self.datagram = False
self.identity = False
self.client_supplied_target_name = None
self.client_channel_binding_unhashed = None
self.unverified_target_name = None
self._password = password
self.server_challenge = None
self.server_target_name = None
self.server_target_info = None
self.server_version = None
self.server_av_netbios_computer_name = None
self.server_av_netbios_domain_name = None
self.server_av_dns_computer_name = None
self.server_av_dns_domain_name = None
self.server_av_dns_forest_name = None
self.server_av_target_name = None
self.server_av_flags = None
self.server_av_timestamp = None
self.server_av_single_host_data = None
self.server_av_channel_bindings = None
self.server_av_flag_constrained = None
self.server_av_flag_integrity = None
self.server_av_flag_target_spn_untrusted = None
self.current_encoding = None
self.client_challenge = None
self.server_target_info_raw = None
def get_client_flag(self, flag):
if not self.client_config_flags:
return False
if flag in FLAG_TYPES:
return True if self.client_config_flags & (1 << flag) else False
raise ValueError('invalid flag')
def get_negotiated_flag(self, flag):
if not self.negotiated_flags:
return False
if flag not in FLAG_TYPES:
raise ValueError('invalid flag')
return True if self.negotiated_flags & (1 << flag) else False
def get_server_av_flag(self, flag):
if not self.server_av_flags:
return False
if flag not in AV_FLAG_TYPES:
raise ValueError('invalid AV flag')
return True if self.server_av_flags & (1 << flag) else False
def set_client_flag(self, flags):
if type(flags) == int:
flags = [flags]
for flag in flags:
if flag in FLAG_TYPES:
self.client_config_flags |= (1 << flag)
else:
raise ValueError('invalid flag')
def reset_client_flags(self):
self.client_config_flags = 0
def unset_client_flag(self, flags):
if type(flags) == int:
flags = [flags]
for flag in flags:
if flag in FLAG_TYPES:
self.client_config_flags &= ~(1 << flag)
else:
raise ValueError('invalid flag')
def create_negotiate_message(self):
"""
Microsoft MS-NLMP 2.2.1.1
"""
self.reset_client_flags()
self.set_client_flag([FLAG_REQUEST_TARGET,
FLAG_NEGOTIATE_56,
FLAG_NEGOTIATE_128,
FLAG_NEGOTIATE_NTLM,
FLAG_NEGOTIATE_ALWAYS_SIGN,
FLAG_NEGOTIATE_OEM,
FLAG_NEGOTIATE_UNICODE,
FLAG_NEGOTIATE_EXTENDED_SESSIONSECURITY])
message = NTLM_SIGNATURE # 8 bytes
message += pack('<I', NTLM_MESSAGE_TYPE_NTLM_NEGOTIATE) # 4 bytes
message += pack('<I', self.client_config_flags) # 4 bytes
message += self.pack_field('', 40) # domain name field # 8 bytes
if self.get_client_flag(FLAG_NEGOTIATE_VERSION): # version 8 bytes - used for debug in ntlm
message += pack_windows_version(True)
else:
message += pack_windows_version(False)
return message
def parse_challenge_message(self, message):
"""
Microsoft MS-NLMP 2.2.1.2
"""
if len(message) < 56: # minimum size of challenge message
return False
if message[0:8] != NTLM_SIGNATURE: # NTLM signature - 8 bytes
return False
if int(unpack('<I', message[8:12])[0]) != NTLM_MESSAGE_TYPE_NTLM_CHALLENGE: # type of message - 4 bytes
return False
target_name_len, _, target_name_offset = self.unpack_field(message[12:20]) # targetNameFields - 8 bytes
self.negotiated_flags = unpack('<I', message[20:24])[0] # negotiated flags - 4 bytes
self.current_encoding = 'utf-16-le' if self.get_negotiated_flag(
FLAG_NEGOTIATE_UNICODE) else oem_encoding # set encoding
self.server_challenge = message[24:32] # server challenge - 8 bytes
target_info_len, _, target_info_offset = self.unpack_field(message[40:48]) # targetInfoFields - 8 bytes
self.server_version = unpack_windows_version(message[48:56])
if self.get_negotiated_flag(FLAG_REQUEST_TARGET) and target_name_len:
self.server_target_name = message[target_name_offset: target_name_offset + target_name_len].decode(
self.current_encoding)
if self.get_negotiated_flag(FLAG_NEGOTIATE_TARGET_INFO) and target_info_len:
self.server_target_info_raw = message[target_info_offset: target_info_offset + target_info_len]
self.server_target_info = self.unpack_av_info(self.server_target_info_raw)
for attribute, value in self.server_target_info:
if attribute == AV_NETBIOS_COMPUTER_NAME:
self.server_av_netbios_computer_name = value.decode('utf-16-le') # always unicode
elif attribute == AV_NETBIOS_DOMAIN_NAME:
self.server_av_netbios_domain_name = value.decode('utf-16-le') # always unicode
elif attribute == AV_DNS_COMPUTER_NAME:
self.server_av_dns_computer_name = value.decode('utf-16-le') # always unicode
elif attribute == AV_DNS_DOMAIN_NAME:
self.server_av_dns_domain_name = value.decode('utf-16-le') # always unicode
elif attribute == AV_DNS_TREE_NAME:
self.server_av_dns_forest_name = value.decode('utf-16-le') # always unicode
elif attribute == AV_FLAGS:
if self.get_server_av_flag(AV_FLAG_CONSTRAINED):
self.server_av_flag_constrained = True
if self.get_server_av_flag(AV_FLAG_INTEGRITY):
self.server_av_flag_integrity = True
if self.get_server_av_flag(AV_FLAG_TARGET_SPN_UNTRUSTED):
self.server_av_flag_target_spn_untrusted = True
elif attribute == AV_TIMESTAMP:
self.server_av_timestamp = format_ad_timestamp(unpack('<Q', value)[0])
elif attribute == AV_SINGLE_HOST_DATA:
self.server_av_single_host_data = value
elif attribute == AV_TARGET_NAME:
self.server_av_target_name = value.decode('utf-16-le') # always unicode
elif attribute == AV_CHANNEL_BINDINGS:
self.server_av_channel_bindings = value
else:
raise ValueError('unknown AV type')
def create_authenticate_message(self):
"""
Microsoft MS-NLMP 2.2.1.3
"""
# 3.1.5.2
if not self.client_config_flags and not self.negotiated_flags:
return False
# 3.1.5.2
if self.get_client_flag(FLAG_NEGOTIATE_128) and not self.get_negotiated_flag(FLAG_NEGOTIATE_128):
return False
# 3.1.5.2
if (not self.server_av_netbios_computer_name or not self.server_av_netbios_domain_name) and self.server_av_flag_integrity:
return False
message = NTLM_SIGNATURE # 8 bytes
message += pack('<I', NTLM_MESSAGE_TYPE_NTLM_AUTHENTICATE) # 4 bytes
pos = 88 # payload starts at 88
# 3.1.5.2
if self.server_target_info:
lm_challenge_response = b''
else:
# computed LmChallengeResponse - todo
lm_challenge_response = b''
message += self.pack_field(lm_challenge_response, pos) # LmChallengeResponseField field # 8 bytes
pos += len(lm_challenge_response)
nt_challenge_response = self.compute_nt_response()
message += self.pack_field(nt_challenge_response, pos) # NtChallengeResponseField field # 8 bytes
pos += len(nt_challenge_response)
domain_name = self.user_domain.encode(self.current_encoding)
message += self.pack_field(domain_name, pos) # DomainNameField field # 8 bytes
pos += len(domain_name)
user_name = self.user_name.encode(self.current_encoding)
message += self.pack_field(user_name, pos) # UserNameField field # 8 bytes
pos += len(user_name)
if self.get_negotiated_flag(FLAG_NEGOTIATE_OEM_WORKSTATION_SUPPLIED) or self.get_negotiated_flag(
FLAG_NEGOTIATE_VERSION):
workstation = gethostname().encode(self.current_encoding)
else:
workstation = b''
message += self.pack_field(workstation, pos) # empty WorkstationField field # 8 bytes
pos += len(workstation)
encrypted_random_session_key = b''
message += self.pack_field(encrypted_random_session_key, pos) # EncryptedRandomSessionKeyField field # 8 bytes
pos += len(encrypted_random_session_key)
message += pack('<I', self.negotiated_flags) # negotiated flags - 4 bytes
if self.get_negotiated_flag(FLAG_NEGOTIATE_VERSION):
message += pack_windows_version(True) # windows version - 8 bytes
else:
message += pack_windows_version() # empty windows version - 8 bytes
message += pack('<Q', 0) # mic
message += pack('<Q', 0) # mic - total of 16 bytes
# payload starts at 88
message += lm_challenge_response
message += nt_challenge_response
message += domain_name
message += user_name
message += workstation
message += encrypted_random_session_key
return message
@staticmethod
def pack_field(value, offset):
return pack('<HHI', len(value), len(value), offset)
@staticmethod
def unpack_field(field_message):
if len(field_message) != 8:
raise ValueError('ntlm field must be 8 bytes long')
return unpack('<H', field_message[0:2])[0], \
unpack('<H', field_message[2:4])[0], \
unpack('<I', field_message[4:8])[0]
@staticmethod
def unpack_av_info(info):
if info:
avs = list()
done = False
pos = 0
while not done:
av_type = unpack('<H', info[pos: pos + 2])[0]
if av_type not in AV_TYPES:
raise ValueError('unknown AV type')
av_len = unpack('<H', info[pos + 2: pos + 4])[0]
av_value = info[pos + 4: pos + 4 + av_len]
pos += av_len + 4
if av_type == AV_END_OF_LIST:
done = True
else:
avs.append((av_type, av_value))
else:
return list()
return avs
@staticmethod
def pack_av_info(avs):
# avs is a list of tuples, each tuple is made of av_type and av_value
info = b''
for av_type, av_value in avs:
if av_type(0) == AV_END_OF_LIST:
continue
info += pack('<H', av_type)
info += pack('<H', len(av_value))
info += av_value
# add AV_END_OF_LIST
info += pack('<H', AV_END_OF_LIST)
info += pack('<H', 0)
return info
@staticmethod
def pack_windows_timestamp():
return pack('<Q', (int(time()) + 11644473600) * 10000000)
def compute_nt_response(self):
if not self.user_name and not self._password: # anonymous authentication
return b''
self.client_challenge = urandom(8)
temp = b''
temp += pack('<B', 1) # ResponseVersion - 1 byte
temp += pack('<B', 1) # HiResponseVersion - 1 byte
temp += pack('<H', 0) # Z(2)
temp += pack('<I', 0) # Z(4) - total Z(6)
temp += self.pack_windows_timestamp() # time - 8 bytes
temp += self.client_challenge # random client challenge - 8 bytes
temp += pack('<I', 0) # Z(4)
temp += self.server_target_info_raw
temp += pack('<I', 0) # Z(4)
response_key_nt = self.ntowf_v2()
nt_proof_str = hmac.new(response_key_nt, self.server_challenge + temp, digestmod=hashlib.md5).digest()
nt_challenge_response = nt_proof_str + temp
return nt_challenge_response
def ntowf_v2(self):
passparts = self._password.split(':')
if len(passparts) == 2 and len(passparts[0]) == 32 and len(passparts[1]) == 32:
# The specified password is an LM:NTLM hash
password_digest = binascii.unhexlify(passparts[1])
else:
try:
password_digest = hashlib.new('MD4', self._password.encode('utf-16-le')).digest()
except ValueError as e:
try:
from Crypto.Hash import MD4 # try with the Crypto library if present
password_digest = MD4.new(self._password.encode('utf-16-le')).digest()
except ImportError:
raise e # raise original exception
return hmac.new(password_digest, (self.user_name.upper() + self.user_domain).encode('utf-16-le'), digestmod=hashlib.md5).digest()