/
fatt.py
994 lines (950 loc) · 43.4 KB
/
fatt.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
#!/usr/bin/env python3
# Copyright (c) 2019, Adel "0x4d31" Karimi.
# All rights reserved.
# Licensed under the BSD 3-Clause license.
# For full license text, see the LICENSE file in the repo root
# or https://opensource.org/licenses/BSD-3-Clause
# fatt. Fingerprint All The Things
# Supported protocols: SSL/TLS, SSH, RDP, HTTP, gQUIC
import argparse
import pyshark
import os
import json
import logging
import struct
from hashlib import md5
from collections import defaultdict
__author__ = "Adel '0x4D31' Karimi"
__version__ = "1.0"
CAP_BPF_FILTER = (
'tcp port 22 or tcp port 2222 or tcp port 3389 or '
'tcp port 443 or tcp port 993 or tcp port 995 or '
'tcp port 636 or tcp port 990 or tcp port 992 or '
'tcp port 989 or tcp port 563 or tcp port 614 or '
'tcp port 3306 or tcp port 80 or udp port 80 or '
'udp port 443')
DISPLAY_FILTER = (
'tls.handshake.type == 1 || tls.handshake.type == 2 ||'
'ssh.message_code == 20 || ssh.protocol || rdp ||'
'gquic.tag == "CHLO" || http.request.method || data-text-lines'
)
DECODE_AS = {
'tcp.port==2222': 'ssh', 'tcp.port==3389': 'tpkt',
'tcp.port==993': 'tls', 'tcp.port==995': 'tls',
'tcp.port==990': 'tls', 'tcp.port==992': 'tls',
'tcp.port==989': 'tls', 'tcp.port==563': 'tls',
'tcp.port==614': 'tls', 'tcp.port==636': 'tls'}
HASSH_VERSION = '1.0'
RDFP_VERSION = '0.3'
class ProcessPackets:
def __init__(self, fingerprint, jlog, pout):
self.logger = logging.getLogger()
self.fingerprint = fingerprint
self.jlog = jlog
self.pout = pout
self.protocol_dict = {}
self.rdp_dict = defaultdict(dict)
def process(self, packet):
record = None
proto = packet.highest_layer
sourceIp = packet.ipv6.src if 'ipv6' in packet else packet.ip.src
destinationIp = packet.ipv6.dst if 'ipv6' in packet else packet.ip.dst
# Clear the dictionary used for extracting ssh protocol strings
# and rdp cookies/negotiateRequests
if len(self.protocol_dict) > 100 and proto != 'SSH':
self.protocol_dict.clear()
if len(self.rdp_dict) > 100 and proto != 'RDP':
self.rdp_dict.clear()
# [ SSH ]
if proto == 'SSH' and ('ssh' in self.fingerprint or
self.fingerprint == 'all'):
# Extract SSH identification string and correlate with KEXINIT msg
if 'protocol' in packet.ssh.field_names:
key = '{}:{}_{}:{}'.format(
sourceIp,
packet.tcp.srcport,
destinationIp,
packet.tcp.dstport)
self.protocol_dict[key] = packet.ssh.protocol
if 'message_code' not in packet.ssh.field_names:
return
if packet.ssh.message_code != '20':
return
# log the anomalous / retransmission packets
if ("analysis_retransmission" in packet.tcp.field_names or
"analysis_spurious_retransmission" in packet.tcp.field_names):
event = event_log(packet, event="retransmission")
if record and self.jlog:
self.logger.info(json.dumps(event))
return
# Client HASSH
if int(packet.tcp.srcport) > int(packet.tcp.dstport):
record = self.client_hassh(packet)
# Print the result
if self.pout:
tmp = ('{sip}:{sp} -> {dip}:{dp} [SSH] hassh={hassh} client={client}')
tmp = tmp.format(
sip=record['sourceIp'],
sp=record['sourcePort'],
dip=record['destinationIp'],
dp=record['destinationPort'],
client=record['ssh']['client'],
hassh=record['ssh']['hassh'],
)
print(tmp)
# Server HASSH
elif int(packet.tcp.srcport) < int(packet.tcp.dstport):
record = self.server_hassh(packet)
# Print the result
if self.pout:
tmp = ('{sip}:{sp} -> {dip}:{dp} [SSH] hasshS={hasshs} server={server}')
tmp = tmp.format(
sip=record['sourceIp'],
sp=record['sourcePort'],
dip=record['destinationIp'],
dp=record['destinationPort'],
server=record['ssh']['server'],
hasshs=record['ssh']['hasshServer'],
)
print(tmp)
if record and self.jlog:
self.logger.info(json.dumps(record))
return
# [ TLS ]
# TODO: extract tls certificates
elif proto == 'TLS' and ('tls' in self.fingerprint or
self.fingerprint == 'all'):
if 'record_content_type' not in packet.tls.field_names:
return
# Content Type: Handshake (22)
if packet.tls.record_content_type != '22':
return
# Handshake Type: Client Hello (1) / Server Hello (2)
if 'handshake_type' not in packet.tls.field_names:
return
htype = packet.tls.handshake_type
if not (htype == '1' or htype == '2'):
return
# log the anomalous / retransmission packets
if ("analysis_retransmission" in packet.tcp.field_names or
"analysis_spurious_retransmission" in packet.tcp.field_names):
event = event_log(packet, event="retransmission")
# JA3
if htype == '1':
record = self.client_ja3(packet)
# Print the result
if self.pout:
tmp = ('{sip}:{sp} -> {dip}:{dp} [TLS] ja3={ja3} serverName={sname}')
tmp = tmp.format(
sip=record['sourceIp'],
sp=record['sourcePort'],
dip=record['destinationIp'],
dp=record['destinationPort'],
sname=record['tls']['serverName'],
ja3=record['tls']['ja3'],
)
print(tmp)
elif htype == '2':
record = self.server_ja3(packet)
# Print the result
if self.pout:
tmp = (
'{sip}:{sp} -> {dip}:{dp} [TLS] ja3s={ja3s}')
tmp = tmp.format(
sip=record['sourceIp'],
sp=record['sourcePort'],
dip=record['destinationIp'],
dp=record['destinationPort'],
ja3s=record['tls']['ja3s'],
)
print(tmp)
if record and self.jlog:
self.logger.info(json.dumps(record))
return
# [ RDP ]
elif proto == 'RDP' and ('rdp' in self.fingerprint or
self.fingerprint == 'all'):
# Extract RDP cookie & negotiate request and correlate with ClientData msg
key = None
if 'rt_cookie' or 'negreq_requestedprotocols':
key = '{}:{}_{}:{}'.format(
sourceIp,
packet.tcp.srcport,
destinationIp,
packet.tcp.dstport)
if 'rt_cookie' in packet.rdp.field_names:
cookie = packet.rdp.rt_cookie.replace('Cookie: ', '')
self.rdp_dict[key]["cookie"] = cookie
if 'negreq_requestedprotocols' in packet.rdp.field_names:
req_protos = packet.rdp.negreq_requestedprotocols
self.rdp_dict[key]["req_protos"] = req_protos
# TLS/CredSSP (not standard RDP security protocols)
if req_protos != "0x00000000":
record = {
"timestamp": packet.sniff_time.isoformat(),
"sourceIp": sourceIp,
"destinationIp": destinationIp,
"sourcePort": packet.tcp.srcport,
"destinationPort": packet.tcp.dstport,
"protocol": "rdp",
"rdp": {
"requestedProtocols": req_protos
}
}
if self.pout:
tmp = (
'{sip}:{sp} -> {dip}:{dp} [RDP] req_protocols={proto}')
tmp = tmp.format(
sip=record['sourceIp'],
sp=record['sourcePort'],
dip=record['destinationIp'],
dp=record['destinationPort'],
proto=record['rdp']['requestedProtocols']
)
print(tmp)
if self.jlog:
self.logger.info(json.dumps(record))
if 'clientdata' not in packet.rdp.field_names:
return
if ("analysis_retransmission" in packet.tcp.field_names or
"analysis_spurious_retransmission" in packet.tcp.field_names):
event = event_log(packet, event="retransmission")
if self.jlog:
self.logger.info(json.dumps(event))
return
# Client RDFP
record = self.client_rdfp(packet)
# Print the result
if self.pout:
tmp = ('{sip}:{sp} -> {dip}:{dp} [RDP] rdfp={rdfp} cookie="{cookie}" req_protocols={proto}')
tmp = tmp.format(
sip=record['sourceIp'],
sp=record['sourcePort'],
dip=record['destinationIp'],
dp=record['destinationPort'],
rdfp=record['rdp']['rdfp'],
cookie=record['rdp']['cookie'],
proto=record['rdp']['requestedProtocols']
)
print(tmp)
if record and self.jlog:
self.logger.info(json.dumps(record))
return
# [ HTTP ]
elif (proto == 'HTTP' or proto == 'DATA-TEXT-LINES') and \
('http' in self.fingerprint or self.fingerprint == 'all'):
if 'request' in packet.http.field_names:
record = self.client_http(packet)
# Print the result
if self.pout:
tmp = ('{sip}:{sp} -> {dip}:{dp} [HTTP] hash={hash} userAgent="{ua}"')
tmp = tmp.format(
sip=record['sourceIp'],
sp=record['sourcePort'],
dip=record['destinationIp'],
dp=record['destinationPort'],
hash=record['http']['clientHeaderHash'],
ua=record['http']['userAgent'],
)
print(tmp)
elif 'response' in packet.http.field_names:
record = self.server_http(packet)
# Print the result
if self.pout:
tmp = ('{sip}:{sp} -> {dip}:{dp} [HTTP] hash={hash} server={server}')
tmp = tmp.format(
sip=record['sourceIp'],
sp=record['sourcePort'],
dip=record['destinationIp'],
dp=record['destinationPort'],
hash=record['http']['serverHeaderHash'],
server=record['http']['server'],
)
print(tmp)
if record and self.jlog:
self.logger.info(json.dumps(record))
return
# [ QUIC ]
elif (proto == 'GQUIC' or proto == 'QUIC') and\
('quic' in self.fingerprint or self.fingerprint == 'all'):
if 'tag' in packet.gquic.field_names:
if packet.gquic.tag == 'CHLO':
record = self.client_gquic(packet)
# Print the result
if self.pout:
tmp = ('{sip}:{sp} -> {dip}:{dp} [QUIC] UAID="{ua}" SNI={sn} AEAD={ea} KEXS={kex}')
tmp = tmp.format(
sip=record['sourceIp'],
sp=record['sourcePort'],
dip=record['destinationIp'],
dp=record['destinationPort'],
ua=record['gquic']['uaid'],
sn=record['gquic']['sni'],
ea=record['gquic']['aead'],
kex=record['gquic']['kexs']
)
print(tmp)
if record and self.jlog:
self.logger.info(json.dumps(record))
return
return
def client_hassh(self, packet):
"""returns HASSH (i.e. SSH Client Fingerprint)
HASSH = md5(KEX;EACTS;MACTS;CACTS)
"""
protocol = None
sourceIp = packet.ipv6.src if 'ipv6' in packet else packet.ip.src
destinationIp = packet.ipv6.dst if 'ipv6' in packet else packet.ip.dst
key = '{}:{}_{}:{}'.format(
sourceIp,
packet.tcp.srcport,
destinationIp,
packet.tcp.dstport)
if key in self.protocol_dict:
protocol = self.protocol_dict[key]
# hassh fields
ckex = ceacts = cmacts = ccacts = ""
if 'kex_algorithms' in packet.ssh.field_names:
ckex = packet.ssh.kex_algorithms
if 'encryption_algorithms_client_to_server' in packet.ssh.field_names:
ceacts = packet.ssh.encryption_algorithms_client_to_server
if 'mac_algorithms_client_to_server' in packet.ssh.field_names:
cmacts = packet.ssh.mac_algorithms_client_to_server
if 'compression_algorithms_client_to_server' in packet.ssh.field_names:
ccacts = packet.ssh.compression_algorithms_client_to_server
# Log other kexinit fields (only in JSON)
clcts = clstc = ceastc = cmastc = ccastc = cshka = ""
if 'languages_client_to_server' in packet.ssh.field_names:
clcts = packet.ssh.languages_client_to_server
if 'languages_server_to_client' in packet.ssh.field_names:
clstc = packet.ssh.languages_server_to_client
if 'encryption_algorithms_server_to_client' in packet.ssh.field_names:
ceastc = packet.ssh.encryption_algorithms_server_to_client
if 'mac_algorithms_server_to_client' in packet.ssh.field_names:
cmastc = packet.ssh.mac_algorithms_server_to_client
if 'compression_algorithms_server_to_client' in packet.ssh.field_names:
ccastc = packet.ssh.compression_algorithms_server_to_client
if 'server_host_key_algorithms' in packet.ssh.field_names:
cshka = packet.ssh.server_host_key_algorithms
# Create hassh
hassh_str = ';'.join([ckex, ceacts, cmacts, ccacts])
hassh = md5(hassh_str.encode()).hexdigest()
record = {
"timestamp": packet.sniff_time.isoformat(),
"sourceIp": sourceIp,
"destinationIp": destinationIp,
"sourcePort": packet.tcp.srcport,
"destinationPort": packet.tcp.dstport,
"protocol": 'ssh',
"ssh": {
"client": protocol,
"hassh": hassh,
"hasshAlgorithms": hassh_str,
"hasshVersion": HASSH_VERSION,
"ckex": ckex,
"ceacts": ceacts,
"cmacts": cmacts,
"ccacts": ccacts,
"clcts": clcts,
"clstc": clstc,
"ceastc": ceastc,
"cmastc": cmastc,
"ccastc": ccastc,
"cshka": cshka
}
}
return record
def server_hassh(self, packet):
"""returns HASSHServer (i.e. SSH Server Fingerprint)
HASSHServer = md5(KEX;EASTC;MASTC;CASTC)
"""
protocol = None
sourceIp = packet.ipv6.src if 'ipv6' in packet else packet.ip.src
destinationIp = packet.ipv6.dst if 'ipv6' in packet else packet.ip.dst
key = '{}:{}_{}:{}'.format(
sourceIp,
packet.tcp.srcport,
destinationIp,
packet.tcp.dstport)
if key in self.protocol_dict:
protocol = self.protocol_dict[key]
# hasshServer fields
skex = seastc = smastc = scastc = ""
if 'kex_algorithms' in packet.ssh.field_names:
skex = packet.ssh.kex_algorithms
if 'encryption_algorithms_server_to_client' in packet.ssh.field_names:
seastc = packet.ssh.encryption_algorithms_server_to_client
if 'mac_algorithms_server_to_client' in packet.ssh.field_names:
smastc = packet.ssh.mac_algorithms_server_to_client
if 'compression_algorithms_server_to_client' in packet.ssh.field_names:
scastc = packet.ssh.compression_algorithms_server_to_client
# Log other kexinit fields (only in JSON)
slcts = slstc = seacts = smacts = scacts = sshka = ""
if 'languages_client_to_server' in packet.ssh.field_names:
slcts = packet.ssh.languages_client_to_server
if 'languages_server_to_client' in packet.ssh.field_names:
slstc = packet.ssh.languages_server_to_client
if 'encryption_algorithms_client_to_server' in packet.ssh.field_names:
seacts = packet.ssh.encryption_algorithms_client_to_server
if 'mac_algorithms_client_to_server' in packet.ssh.field_names:
smacts = packet.ssh.mac_algorithms_client_to_server
if 'compression_algorithms_client_to_server' in packet.ssh.field_names:
scacts = packet.ssh.compression_algorithms_client_to_server
if 'server_host_key_algorithms' in packet.ssh.field_names:
sshka = packet.ssh.server_host_key_algorithms
# Create hasshServer
hasshs_str = ';'.join([skex, seastc, smastc, scastc])
hasshs = md5(hasshs_str.encode()).hexdigest()
record = {
"timestamp": packet.sniff_time.isoformat(),
"sourceIp": sourceIp,
"destinationIp": destinationIp,
"sourcePort": packet.tcp.srcport,
"destinationPort": packet.tcp.dstport,
"protocol": 'ssh',
"ssh": {
"server": protocol,
"hasshServer": hasshs,
"hasshServerAlgorithms": hasshs_str,
"hasshVersion": HASSH_VERSION,
"skex": skex,
"seastc": seastc,
"smastc": smastc,
"scastc": scastc,
"slcts": slcts,
"slstc": slstc,
"seacts": seacts,
"smacts": smacts,
"scacts": scacts,
"sshka": sshka
}
}
return record
def client_ja3(self, packet):
# GREASE_TABLE Ref: https://tools.ietf.org/html/draft-davidben-tls-grease-00
GREASE_TABLE = ['2570', '6682', '10794', '14906', '19018', '23130',
'27242', '31354', '35466', '39578', '43690', '47802',
'51914', '56026', '60138', '64250']
# ja3 fields
tls_version = ciphers = extensions = elliptic_curve = ec_pointformat = ""
if 'handshake_version' in packet.tls.field_names:
tls_version = int(packet.tls.handshake_version, 16)
tls_version = str(tls_version)
if 'handshake_ciphersuite' in packet.tls.field_names:
cipher_list = [
c.show for c in packet.tls.handshake_ciphersuite.fields
if c.show not in GREASE_TABLE]
ciphers = '-'.join(cipher_list)
if 'handshake_extension_type' in packet.tls.field_names:
extension_list = [
e.show for e in packet.tls.handshake_extension_type.fields
if e.show not in GREASE_TABLE]
extensions = '-'.join(extension_list)
if 'handshake_extensions_supported_group' in packet.tls.field_names:
ec_list = [str(int(ec.show, 16)) for ec in
packet.tls.handshake_extensions_supported_group.fields
if str(int(ec.show, 16)) not in GREASE_TABLE]
elliptic_curve = '-'.join(ec_list)
if 'handshake_extensions_ec_point_format' in packet.tls.field_names:
ecpf_list = [ecpf.show for ecpf in
packet.tls.handshake_extensions_ec_point_format.fields
if ecpf.show not in GREASE_TABLE]
ec_pointformat = '-'.join(ecpf_list)
# TODO: log other non-ja3 fields
server_name = ""
if 'handshake_extensions_server_name' in packet.tls.field_names:
server_name = packet.tls.handshake_extensions_server_name
# Create ja3
ja3_string = ','.join([
tls_version, ciphers, extensions, elliptic_curve, ec_pointformat])
ja3 = md5(ja3_string.encode()).hexdigest()
sourceIp = packet.ipv6.src if 'ipv6' in packet else packet.ip.src
destinationIp = packet.ipv6.dst if 'ipv6' in packet else packet.ip.dst
record = {
"timestamp": packet.sniff_time.isoformat(),
"sourceIp": sourceIp,
"destinationIp": destinationIp,
"sourcePort": packet.tcp.srcport,
"destinationPort": packet.tcp.dstport,
"protocol": "tls",
"tls": {
"serverName": server_name,
"ja3": ja3,
"ja3Algorithms": ja3_string,
"ja3Version": tls_version,
"ja3Ciphers": ciphers,
"ja3Extensions": extensions,
"ja3Ec": elliptic_curve,
"ja3EcFmt": ec_pointformat
}
}
return record
def server_ja3(self, packet):
# GREASE_TABLE Ref: https://tools.ietf.org/html/draft-davidben-tls-grease-00
GREASE_TABLE = ['2570', '6682', '10794', '14906', '19018', '23130',
'27242', '31354', '35466', '39578', '43690', '47802',
'51914', '56026', '60138', '64250']
# ja3s fields
tls_version = ciphers = extensions = ""
if 'handshake_version' in packet.tls.field_names:
tls_version = int(packet.tls.handshake_version, 16)
tls_version = str(tls_version)
if 'handshake_ciphersuite' in packet.tls.field_names:
cipher_list = [
c.show for c in packet.tls.handshake_ciphersuite.fields
if c.show not in GREASE_TABLE]
ciphers = '-'.join(cipher_list)
if 'handshake_extension_type' in packet.tls.field_names:
extension_list = [
e.show for e in packet.tls.handshake_extension_type.fields
if e.show not in GREASE_TABLE]
extensions = '-'.join(extension_list)
# TODO: log other non-ja3s fields
# Create ja3s
ja3s_string = ','.join([
tls_version, ciphers, extensions])
ja3s = md5(ja3s_string.encode()).hexdigest()
sourceIp = packet.ipv6.src if 'ipv6' in packet else packet.ip.src
destinationIp = packet.ipv6.dst if 'ipv6' in packet else packet.ip.dst
record = {
"timestamp": packet.sniff_time.isoformat(),
"sourceIp": sourceIp,
"destinationIp": destinationIp,
"sourcePort": packet.tcp.srcport,
"destinationPort": packet.tcp.dstport,
"protocol": "tls",
"tls": {
"ja3s": ja3s,
"ja3sAlgorithms": ja3s_string,
"ja3sVersion": tls_version,
"ja3sCiphers": ciphers,
"ja3sExtensions": extensions
}
}
return record
def client_rdfp(self, packet):
"""returns ClientData message fields and RDFP (experimental fingerprint)
RDFP = md5(verMajor,verMinor,clusterFlags,encryptionMethods,extEncMethods,channelDef)
"""
# RDP fields
verMajor = verMinor = desktopWidth = desktopHeight = colorDepth = \
sasSequence = keyboardLayout = clientBuild = clientName = \
keyboardSubtype = keyboardType = keyboardFuncKey = postbeta2ColorDepth \
= clientProductId = serialNumber = highColorDepth = \
supportedColorDepths = earlyCapabilityFlags = clientDigProductId = \
connectionType = pad1Octet = clusterFlags = encryptionMethods = \
extEncMethods = channelCount = channelDef = cookie = req_protos = ""
sourceIp = packet.ipv6.src if 'ipv6' in packet else packet.ip.src
destinationIp = packet.ipv6.dst if 'ipv6' in packet else packet.ip.dst
key = '{}:{}_{}:{}'.format(
sourceIp,
packet.tcp.srcport,
destinationIp,
packet.tcp.dstport)
if key in self.rdp_dict and "cookie" in self.rdp_dict[key]:
cookie = self.rdp_dict[key]["cookie"]
if key in self.rdp_dict and "req_protos" in self.rdp_dict[key]:
req_protos = self.rdp_dict[key]["req_protos"]
# Client Core Data
# https://msdn.microsoft.com/en-us/library/cc240510.aspx
if 'version_major' in packet.rdp.field_names:
verMajor = packet.rdp.version_major
if 'version_minor' in packet.rdp.field_names:
verMinor = packet.rdp.version_minor
if 'desktop_width' in packet.rdp.field_names:
desktopWidth = packet.rdp.desktop_width
if 'desktop_height' in packet.rdp.field_names:
desktopHeight = packet.rdp.desktop_height
if 'colordepth' in packet.rdp.field_names:
colorDepth = packet.rdp.colordepth
if 'sassequence' in packet.rdp.field_names:
sasSequence = packet.rdp.sassequence
if 'keyboardlayout' in packet.rdp.field_names:
keyboardLayout = packet.rdp.keyboardlayout
if 'client_build' in packet.rdp.field_names:
clientBuild = packet.rdp.client_build
if 'client_name' in packet.rdp.field_names:
clientName = packet.rdp.client_name
if 'keyboard_subtype' in packet.rdp.field_names:
keyboardSubtype = packet.rdp.keyboard_subtype
if 'keyboard_type' in packet.rdp.field_names:
keyboardType = packet.rdp.keyboard_type
if 'keyboard_functionkey' in packet.rdp.field_names:
keyboardFuncKey = packet.rdp.keyboard_functionkey
if 'postbeta2colordepth' in packet.rdp.field_names:
postbeta2ColorDepth = packet.rdp.postbeta2colordepth
if 'client_productid' in packet.rdp.field_names:
clientProductId = packet.rdp.client_productid
if 'serialnumber' in packet.rdp.field_names:
serialNumber = packet.rdp.serialnumber
if 'highcolordepth' in packet.rdp.field_names:
highColorDepth = packet.rdp.highcolordepth
if 'supportedcolordepths' in packet.rdp.field_names:
supportedColorDepths = packet.rdp.supportedcolordepths
if 'earlycapabilityflags' in packet.rdp.field_names:
earlyCapabilityFlags = packet.rdp.earlycapabilityflags
if 'client_digproductid' in packet.rdp.field_names:
clientDigProductId = packet.rdp.client_digproductid
if 'connectiontype' in packet.rdp.field_names:
connectionType = packet.rdp.connectiontype
if 'pad1octet' in packet.rdp.field_names:
pad1Octet = packet.rdp.pad1octet.raw_value
# Client Cluster Data
# https://msdn.microsoft.com/en-us/library/cc240514.aspx
if 'clusterflags' in packet.rdp.field_names:
clusterFlags_raw = packet.rdp.clusterflags.raw_value
# convert to little-endian
clusterFlags = struct.pack('<L', int(clusterFlags_raw, base=16))
clusterFlags = clusterFlags.hex()
# Client Security Data
# Only for "Standard RDP Security mechanisms"
# https://msdn.microsoft.com/en-us/library/cc240511.aspx
if 'encryptionmethods' in packet.rdp.field_names:
encryptionMethods_raw = packet.rdp.encryptionmethods.raw_value
# convert to little-endian
encryptionMethods = struct.pack('<L', int(encryptionMethods_raw, base=16))
encryptionMethods = encryptionMethods.hex()
# In French locale clients, encryptionMethods MUST be set to zero and
# extEncryptionMethods MUST be set to the value to which encryptionMethods
# would have been set.
if 'extencryptionmethods' in packet.rdp.field_names:
extEncMethods_raw = packet.rdp.extencryptionmethods.raw_value
# convert to little-endian
extEncMethods = struct.pack('<L', int(extEncMethods_raw, base=16))
extEncMethods = extEncMethods.hex()
# Client Network Data
# https://msdn.microsoft.com/en-us/library/cc240512.aspx
channelDefArray = {}
if 'channelcount' in packet.rdp.field_names:
channelCount = packet.rdp.channelcount
channelDef_temp = []
for i in range(int(channelCount)):
name = packet.rdp.name.all_fields[i].show
options_raw = packet.rdp.options.all_fields[i].raw_value
# convert to little-endian
options = struct.pack('<L', int(options_raw, base=16))
options = options.hex()
channelDefArray[i] = {
"name": name,
"options": options
}
channelDef_temp.append("{}:{}".format(name, options))
channelDef = '-'.join(channelDef_temp)
# Create RDFP
rdfp_str = ','.join(str(x) for x in [
verMajor, verMinor, clusterFlags, encryptionMethods, extEncMethods,
channelDef])
rdfp = md5(rdfp_str.encode()).hexdigest()
record = {
"timestamp": packet.sniff_time.isoformat(),
"sourceIp": sourceIp,
"destinationIp": destinationIp,
"sourcePort": packet.tcp.srcport,
"destinationPort": packet.tcp.dstport,
"protocol": "rdp",
"rdp": {
"cookie": cookie,
"requestedProtocols": req_protos,
"rdfp": rdfp,
"rdfpAlgorithms": rdfp_str,
"rdfpVersion": RDFP_VERSION,
"verMajor": verMajor,
"verMinor": verMinor,
"desktopWidth": desktopWidth,
"desktopHeight": desktopHeight,
"colorDepth": colorDepth,
"sasSequence": sasSequence,
"keyboardLayout": keyboardLayout,
"clientBuild": clientBuild,
"clientName": clientName,
"keyboardSubtype": keyboardSubtype,
"keyboardType": keyboardType,
"keyboardFuncKey": keyboardFuncKey,
"postbeta2ColorDepth": postbeta2ColorDepth,
"clientProductId": clientProductId,
"serialNumber": serialNumber,
"highColorDepth": highColorDepth,
"supportedColorDepths": supportedColorDepths,
"earlyCapabilityFlags": earlyCapabilityFlags,
"clientDigProductId": clientDigProductId,
"connectionType": connectionType,
"pad1Octet": pad1Octet,
"clusterFlags": clusterFlags,
"encryptionMethods": encryptionMethods,
"extEncMethods": extEncMethods,
"channelDefArray": channelDefArray
}
}
return record
def client_http(self, packet):
# TODO: log full http req header
REQ_WL = ['', '_ws_expert', 'chat', '_ws_expert_message',
'_ws_expert_severity', '_ws_expert_group', 'request_method',
'request_uri', 'request_version', 'request_line',
'request_full_uri',
'request', 'request_number', 'prev_request_in']
req_headers = [i for i in packet.http.field_names if i not in REQ_WL]
ua = requestURI = requestFullURI = requestVersion = requestMethod = ""
if 'user_agent' in packet.http.field_names:
ua = packet.http.user_agent
if 'request_uri' in packet.http.field_names:
requestURI = packet.http.request_uri
if 'request_full_uri' in packet.http.field_names:
requestFullURI = packet.http.request_full_uri
if 'request_version' in packet.http.field_names:
requestVersion = packet.http.request_version
if 'request_method' in packet.http.field_names:
requestMethod = packet.http.request_method
client_header_ordering = ','.join(req_headers)
client_header_hash = md5(client_header_ordering.encode('utf-8')).hexdigest()
sourceIp = packet.ipv6.src if 'ipv6' in packet else packet.ip.src
destinationIp = packet.ipv6.dst if 'ipv6' in packet else packet.ip.dst
record = {
"timestamp": packet.sniff_time.isoformat(),
"sourceIp": sourceIp,
"destinationIp": destinationIp,
"sourcePort": packet.tcp.srcport,
"destinationPort": packet.tcp.dstport,
"protocol": "http",
"http": {
"requestURI": requestURI,
"requestFullURI": requestFullURI,
"requestVersion": requestVersion,
"requestMethod": requestMethod,
"userAgent": ua,
"clientHeaderOrder": client_header_ordering,
"clientHeaderHash": client_header_hash
}
}
return record
def server_http(self, packet):
# TODO: log full http resp header
RESP_WL = ['', '_ws_expert', 'chat', '_ws_expert_message',
'_ws_expert_severity', '_ws_expert_group',
'response_version',
'response_code', 'response_code_desc', 'response_phrase',
'response_line', 'content_length_header', 'response',
'response_number', 'time', 'request_in', 'response_for_uri',
'file_data', 'prev_request_in', 'prev_response_in']
resp_headers = [i for i in packet.http.field_names if i not in RESP_WL]
server_header_ordering = ','.join(resp_headers)
server_header_hash = md5(
server_header_ordering.encode('utf-8')).hexdigest()
server = responseVersion = responseCode = contentLength = ""
if 'server' in packet.http.field_names:
server = packet.http.server
if 'response_version' in packet.http.field_names:
responseVersion = packet.http.response_version
if 'response_code' in packet.http.field_names:
responseCode = packet.http.response_code
if 'content_length' in packet.http.field_names:
contentLength = packet.http.content_length
sourceIp = packet.ipv6.src if 'ipv6' in packet else packet.ip.src
destinationIp = packet.ipv6.dst if 'ipv6' in packet else packet.ip.dst
record = {
"timestamp": packet.sniff_time.isoformat(),
"sourceIp": sourceIp,
"destinationIp": destinationIp,
"sourcePort": packet.tcp.srcport,
"destinationPort": packet.tcp.dstport,
"protocol": "http",
"http": {
"server": server,
"responseVersion": responseVersion,
"responseCode": responseCode,
"contentLength": contentLength,
"serverHeaderOrder": server_header_ordering,
"serverHeaderHash": server_header_hash
}
}
return record
def client_gquic(self, packet):
# https://tools.ietf.org/html/draft-ietf-quic-transport-20
sni = uaid = ver = stk = pdmd = ccs = ccrt = aead = scid = smhl = mids \
= kexs = xlct = copt = ccrt = None
if 'tag_sni' in packet.gquic.field_names:
sni = packet.gquic.tag_sni
if 'tag_uaid' in packet.gquic.field_names:
uaid = packet.gquic.tag_uaid
if 'tag_version' in packet.gquic.field_names:
ver = packet.gquic.tag_version
if 'tag_stk' in packet.gquic.field_names:
stk = packet.gquic.tag_stk.raw_value
if 'tag_pdmd' in packet.gquic.field_names:
pdmd = packet.gquic.tag_pdmd
if 'tag_ccs' in packet.gquic.field_names:
ccs = packet.gquic.tag_ccs.raw_value
if 'tag_ccrt' in packet.gquic.field_names:
ccrt = packet.gquic.tag_ccrt.raw_value
if 'tag_aead' in packet.gquic.field_names:
aead = packet.gquic.tag_aead
if 'tag_scid' in packet.gquic.field_names:
scid = packet.gquic.tag_scid.raw_value
if 'tag_smhl' in packet.gquic.field_names:
smhl = packet.gquic.tag_smhl
if 'tag_mids' in packet.gquic.field_names:
mids = packet.gquic.tag_mids
if 'tag_kexs' in packet.gquic.field_names:
kexs = packet.gquic.tag_kexs
if 'tag_xlct' in packet.gquic.field_names:
xlct = packet.gquic.tag_xlct.raw_value
if 'tag_copt' in packet.gquic.field_names:
copt = packet.gquic.tag_copt
if 'tag_ccrt' in packet.gquic.field_names:
ccrt = packet.gquic.tag_ccrt.raw_value
sourceIp = packet.ipv6.src if 'ipv6' in packet else packet.ip.src
destinationIp = packet.ipv6.dst if 'ipv6' in packet else packet.ip.dst
record = {
"timestamp": packet.sniff_time.isoformat(),
"sourceIp": sourceIp,
"destinationIp": destinationIp,
"sourcePort": packet.udp.srcport,
"destinationPort": packet.udp.dstport,
"protocol": "gquic",
"gquic": {
"tagNumber": packet.gquic.tag_number,
"sni": sni,
"uaid": uaid,
"ver": ver,
"aead": aead,
"smhl": smhl,
"mids": mids,
"kexs": kexs,
"xlct": xlct,
"copt": copt,
"ccrt": ccrt,
# you can uncomment the following fields
# TODO: cfcw, sfcw, irtt, csct, sclc, pubs, icsl, smhl, tcid, scid?!
"stk": stk,
"pdmd": pdmd,
"ccs": ccs,
"ccrt": ccrt,
"scid": scid
}
}
return record
def event_log(packet, event):
"""log the anomalous packets"""
if event == "retransmission":
event_message = "This packet is a (suspected) retransmission"
# Report the event (only for JSON output)
sourceIp = packet.ipv6.src if 'ipv6' in packet else packet.ip.src
destinationIp = packet.ipv6.dst if 'ipv6' in packet else packet.ip.dst
msg = {"timestamp": packet.sniff_time.isoformat(),
"eventType": event,
"eventMessage": event_message,
"sourceIp": sourceIp,
"destinationIp": destinationIp,
"sourcePort": packet.tcp.srcport,
"destinationPort": packet.tcp.dstport}
return msg
def parse_cmd_args():
"""parse command line arguments"""
desc = """A python script for extracting network fingerprints"""
parser = argparse.ArgumentParser(description=(desc))
helptxt = "pcap file to process"
parser.add_argument('-r', '--read_file', type=str, help=helptxt)
helptxt = "directory of pcap files to process"
parser.add_argument('-d', '--read_directory', type=str, help=helptxt)
helptxt = "listen on interface"
parser.add_argument('-i', '--interface', type=str, help=helptxt)
helptxt = "protocols to fingerprint. Default: all"
parser.add_argument(
'-fp',
'--fingerprint',
nargs='*',
default='all',
choices=['tls', 'ssh', 'rdp', 'http', 'gquic'],
help=helptxt)
helptxt = "a dictionary of {decode_criterion_string: decode_as_protocol} \
that is used to tell tshark to decode protocols in situations it \
wouldn't usually."
parser.add_argument(
'-da', '--decode_as', type=json.loads, default=DECODE_AS, help=helptxt)
helptxt = "BPF capture filter to use (for live capture only).'"
parser.add_argument(
'-f', '--bpf_filter', type=str, default=CAP_BPF_FILTER, help=helptxt)
helptxt = "log the output in json format"
parser.add_argument(
'-j', '--json_logging', action="store_true", help=helptxt)
helptxt = "specify the output log file. Default: fatt.log"
parser.add_argument(
'-o', '--output_file', default='fatt.log', type=str, help=helptxt)
helptxt = "save the live captured packets to this file"
parser.add_argument(
'-w', '--write_pcap', default=None, type=str, help=helptxt)
helptxt = "print the output"
parser.add_argument(
'-p', '--print_output', action="store_true", help=helptxt)
return parser.parse_args()
def setup_logging(logfile):
"""setup logging"""
logger = logging.getLogger()
handler = logging.FileHandler(logfile)
formatter = logging.Formatter('%(message)s')
handler.setFormatter(formatter)
logger.addHandler(handler)
logger.setLevel(logging.INFO)
return logger
def main():
"""intake arguments from the user and extract RDP client fingerprints."""
global DISPLAY_FILTER
args = parse_cmd_args()
setup_logging(args.output_file)
fingerprint = args.fingerprint
jlog = args.json_logging
pout = args.print_output
pp = ProcessPackets(fingerprint, jlog, pout)
# Process PCAP file
if args.read_file:
cap = pyshark.FileCapture(
args.read_file,
display_filter=DISPLAY_FILTER,
keep_packets=False,
decode_as=args.decode_as)
try:
for packet in cap:
pp.process(packet)
cap.close()
cap.eventloop.stop()
except Exception as e:
print('Error: {}'.format(e))
pass
# Process directory of PCAP files
elif args.read_directory:
files = [f.path for f in os.scandir(args.read_directory)
if not f.name.startswith('.') and not f.is_dir() and
(f.name.endswith(".pcap") or f.name.endswith(".pcapng") or
f.name.endswith(".cap"))]
for file in files:
cap = pyshark.FileCapture(
file,
display_filter=DISPLAY_FILTER,
keep_packets=False,
decode_as=args.decode_as)
try:
for packet in cap:
pp.process(packet)
cap.close()
cap.eventloop.stop()
except Exception as e:
print('Error: {}'.format(e))
pass
# Capture live network traffic
elif args.interface:
if args.write_pcap:
DISPLAY_FILTER = None
# TODO: Use a Ring Buffer (LiveRingCapture), when the issue is fixed:
# https://github.com/KimiNewt/pyshark/issues/299
cap = pyshark.LiveCapture(
interface=args.interface,
decode_as=args.decode_as,
display_filter=DISPLAY_FILTER,
bpf_filter=args.bpf_filter,
output_file=args.write_pcap)
try:
cap.apply_on_packets(pp.process)
except (KeyboardInterrupt, SystemExit):
print("Exiting..\nBYE o/\n")
if __name__ == '__main__':
main()