aboutsummaryrefslogtreecommitdiffstats
path: root/epan/dissectors/packet-eap.c
blob: 9e9d8e472816bca019dee511db8bb8778dbae577 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
/* packet-eap.c
 * Routines for EAP Extensible Authentication Protocol dissection
 * RFC 2284, RFC 3748
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include <glib.h>
#include <epan/packet.h>
#include <epan/conversation.h>
#include <epan/ppptypes.h>
#include <epan/reassemble.h>
#include <epan/wmem/wmem.h>
#include <epan/eap.h>
#include <epan/expert.h>

#include "packet-wps.h"

void proto_register_eap(void);
void proto_reg_handoff_eap(void);

static int proto_eap = -1;
static int hf_eap_code = -1;
static int hf_eap_identifier = -1;
static int hf_eap_len = -1;
static int hf_eap_type = -1;
static int hf_eap_type_nak = -1;

static int hf_eap_identity = -1;

static int hf_eap_notification = -1;

static int hf_eap_md5_value_size = -1;
static int hf_eap_md5_value = -1;
static int hf_eap_md5_extra_data = -1;

static int hf_eap_sim_subtype = -1;
static int hf_eap_sim_reserved = -1;
static int hf_eap_sim_subtype_attribute = -1;
static int hf_eap_sim_subtype_type = -1;
static int hf_eap_sim_subtype_length = -1;
static int hf_eap_sim_subtype_value = -1;

static int hf_eap_aka_subtype = -1;
static int hf_eap_aka_reserved = -1;
static int hf_eap_aka_subtype_attribute = -1;
static int hf_eap_aka_subtype_type = -1;
static int hf_eap_aka_subtype_length = -1;
static int hf_eap_aka_subtype_value = -1;

static int hf_eap_leap_version = -1;
static int hf_eap_leap_reserved = -1;
static int hf_eap_leap_count = -1;
static int hf_eap_leap_peer_challenge = -1;
static int hf_eap_leap_peer_response = -1;
static int hf_eap_leap_ap_challenge = -1;
static int hf_eap_leap_ap_response = -1;
static int hf_eap_leap_data = -1;
static int hf_eap_leap_name = -1;

static int hf_eap_ms_chap_v2_opcode = -1;
static int hf_eap_ms_chap_v2_id = -1;
static int hf_eap_ms_chap_v2_length = -1;
static int hf_eap_ms_chap_v2_value_size = -1;
static int hf_eap_ms_chap_v2_challenge = -1;
static int hf_eap_ms_chap_v2_name = -1;
static int hf_eap_ms_chap_v2_peer_challenge = -1;
static int hf_eap_ms_chap_v2_reserved = -1;
static int hf_eap_ms_chap_v2_nt_response = -1;
static int hf_eap_ms_chap_v2_flags = -1;
static int hf_eap_ms_chap_v2_response = -1;
static int hf_eap_ms_chap_v2_message = -1;
static int hf_eap_ms_chap_v2_failure_request = -1;
static int hf_eap_ms_chap_v2_data = -1;
static int hf_eap_data = -1;

static gint ett_eap = -1;

static expert_field ei_eap_ms_chap_v2_length = EI_INIT;
static expert_field ei_eap_mitm_attacks = EI_INIT;
static expert_field ei_eap_md5_value_size_overflow = EI_INIT;
static expert_field ei_eap_dictionary_attacks = EI_INIT;

static dissector_handle_t eap_handle;

static dissector_handle_t ssl_handle;

const value_string eap_code_vals[] = {
  { EAP_REQUEST,  "Request" },
  { EAP_RESPONSE, "Response" },
  { EAP_SUCCESS,  "Success" },
  { EAP_FAILURE,  "Failure" },
  { EAP_INITIATE, "Initiate" }, /* [RFC5296] */
  { EAP_FINISH,   "Finish" },   /* [RFC5296] */
  { 0,            NULL }
};

/*
References:
  1) http://www.iana.org/assignments/ppp-numbers PPP EAP REQUEST/RESPONSE TYPES
  2) http://www.ietf.org/internet-drafts/draft-ietf-pppext-rfc2284bis-02.txt
  3) RFC2284
  4) RFC3748
  5) http://www.iana.org/assignments/eap-numbers EAP registry (updated 2011-02-22)
  6) http://tools.ietf.org/html/draft-bersani-eap-synthesis-sharedkeymethods-00
*/

static const value_string eap_type_vals[] = {
    {   1,         "Identity" },
    {   2,         "Notification" },
    {   3,         "Legacy Nak (Response Only)" },
    {   4,         "MD5-Challenge EAP (EAP-MD5-CHALLENGE)" },
    {   5,         "One-Time Password EAP (EAP-OTP)" },
    {   6,         "Generic Token Card EAP (EAP-GTC)" },
    {   7,         "Allocated" },
    {   8,         "Allocated" },
    {   9,         "RSA Public Key Authentication EAP (EAP-RSA-PKA)" },
    {  10,         "DSS Unilateral EAP (EAP-DSS)" },
    {  11,         "KEA EAP (EAP-KEA)" },
    {  12,         "KEA Validate EAP (EAP-KEA-VALIDATE)" },
    {  13,         "TLS EAP (EAP-TLS)" },
    {  14,         "Defender Token EAP (EAP-AXENT)" },
    {  15,         "RSA Security SecurID EAP (EAP-RSA-SECURID)" },
    {  16,         "Arcot Systems EAP (EAP-ARCOT-SYSTEMS)" },
    {  17,         "Cisco Wireless EAP / Lightweight EAP (EAP-LEAP)" },
    {  18,         "GSM Subscriber Identity Modules EAP (EAP-SIM)" },
    {  19,         "Secure Remote Password SHA1 Part 1 EAP (EAP-SRP-SHA1-PART1)" },
    {  20,         "Secure Remote Password SHA1 Part 2 EAP (EAP-SRP-SHA1-PART2)" },
    {  21,         "Tunneled TLS EAP (EAP-TTLS)" },
    {  22,         "Remote Access Service EAP (EAP-RAS)" },
    {  23,         "UMTS Authentication and Key Agreement EAP (EAP-AKA)" },
    {  24,         "3Com Wireless EAP (EAP-3COM-WIRELESS)" },
    {  25,         "Protected EAP (EAP-PEAP)" },
    {  26,         "MS-Authentication EAP (EAP-MS-AUTH)" },
    {  27,         "Mutual Authentication w/Key Exchange EAP (EAP-MAKE)" },
    {  28,         "CRYPTOCard EAP (EAP-CRYPTOCARD)" },
    {  29,         "MS-CHAP-v2 EAP (EAP-MS-CHAP-V2)" },
    {  30,         "DynamID EAP (EAP-DYNAMID)" },
    {  31,         "Rob EAP (EAP-ROB)" },
    {  32,         "Protected One-Time Password EAP (EAP-POTP)" },
    {  33,         "MS-Authentication TLV EAP (EAP-MS-AUTH-TLV)" },
    {  34,         "SentriNET (EAP-SENTRINET)" },
    {  35,         "Actiontec Wireless EAP (EAP-ACTIONTEC-WIRELESS)" },
    {  36,         "Cogent Systems Biometrics Authentication EAP (EAP-COGENT-BIOMETRIC)" },
    {  37,         "AirFortress EAP (EAP-AIRFORTRESS)" },
    {  38,         "HTTP Digest EAP (EAP-HTTP-DIGEST)" },
    {  39,         "SecureSuite EAP (EAP-SECURESUITE)" },
    {  40,         "DeviceConnect EAP (EAP-DEVICECONNECT)" },
    {  41,         "Simple Password Exponential Key Exchange EAP (EAP-SPEKE)" },
    {  42,         "MOBAC EAP (EAP-MOBAC)" },
    {  43,         "Flexible Authentication via Secure Tunneling EAP (EAP-FAST)" },
    {  44,         "ZoneLabs EAP (EAP-ZLXEAP)" },
    {  45,         "Link EAP (EAP-LINK)" },
    {  46,         "Password Authenticated eXchange EAP (EAP-PAX)" },
    {  47,         "Pre-Shared Key EAP (EAP-PSK)" },
    {  48,         "Shared-secret Authentication and Key Establishment EAP (EAP-SAKE)" },
    {  49,         "Internet Key Exchange v2 EAP (EAP-IKEv2)" },
    {  50,         "UMTS Authentication and Key Agreement' EAP (EAP-AKA')" },
    {  51,         "Generalized Pre-Shared Key EAP (EAP-GPSK)" },
    {  52,         "Password EAP (EAP-pwd)" },
    {  53,         "Encrypted Key Exchange v1 EAP (EAP-EKEv1)" },
    { 254,         "Expanded Type" },
    { 255,         "Experimental" },
    { 0,           NULL }
};
value_string_ext eap_type_vals_ext = VALUE_STRING_EXT_INIT(eap_type_vals);

const value_string eap_sim_subtype_vals[] = {
  { SIM_START,             "Start" },
  { SIM_CHALLENGE,         "Challenge" },
  { SIM_NOTIFICATION,      "Notification" },
  { SIM_RE_AUTHENTICATION, "Re-authentication" },
  { SIM_CLIENT_ERROR,      "Client-Error" },
  { 0, NULL }
};

const value_string eap_aka_subtype_vals[] = {
  { AKA_CHALLENGE,               "AKA-Challenge" },
  { AKA_AUTHENTICATION_REJECT,   "AKA-Authentication-Reject" },
  { AKA_SYNCHRONIZATION_FAILURE, "AKA-Synchronization-Failure" },
  { AKA_IDENTITY,                "AKA-Identity" },
  { AKA_NOTIFICATION,            "Notification" },
  { AKA_REAUTHENTICATION,        "Re-authentication" },
  { AKA_CLIENT_ERROR,            "Client-Error" },
  { 0, NULL }
};

/*
References:
  1) http://www.iana.org/assignments/eapsimaka-numbers/eapsimaka-numbers.xml
  3) RFC4186
  3) RFC4187
  4) RFC5448
  5) 3GPP TS 24.302
*/

static const value_string eap_sim_aka_attribute_vals[] = {
  {   1, "AT_RAND" },
  {   2, "AT_AUTN" },
  {   3, "AT_RES" },
  {   4, "AT_AUTS" },
  {   6, "AT_PADDING" },
  {   7, "AT_NONCE_MT" },
  {  10, "AT_PERMANENT_ID_REQ" },
  {  11, "AT_MAC" },
  {  12, "AT_NOTIFICATION" },
  {  13, "AT_ANY_ID_REQ" },
  {  14, "AT_IDENTITY" },
  {  15, "AT_VERSION_LIST" },
  {  16, "AT_SELECTED_VERSION" },
  {  17, "AT_FULLAUTH_ID_REQ" },
  {  19, "AT_COUNTER" },
  {  20, "AT_COUNTER_TOO_SMALL" },
  {  21, "AT_NONCE_S" },
  {  22, "AT_CLIENT_ERROR_CODE" },
  {  23, "AT_KDF_INPUT"},
  {  24, "AT_KDF"},
  { 129, "AT_IV" },
  { 130, "AT_ENCR_DATA" },
  { 132, "AT_NEXT_PSEUDONYM" },
  { 133, "AT_NEXT_REAUTH_ID" },
  { 134, "AT_CHECKCODE" },
  { 135, "AT_RESULT_IND" },
  { 136, "AT_BIDDING" },
  { 137, "AT_IPMS_IND" },
  { 138, "AT_IPMS_RES" },
  { 139, "AT_TRUST_IND" },
  { 0, NULL }
};
value_string_ext eap_sim_aka_attribute_vals_ext = VALUE_STRING_EXT_INIT(eap_sim_aka_attribute_vals);

const value_string eap_ms_chap_v2_opcode_vals[] = {
  { MS_CHAP_V2_CHALLENGE,       "Challenge" },
  { MS_CHAP_V2_RESPONSE,        "Response" },
  { MS_CHAP_V2_SUCCESS,         "Success" },
  { MS_CHAP_V2_FAILURE,         "Failure" },
  { MS_CHAP_V2_CHANGE_PASSWORD, "Change-Password" },
  { 0, NULL }
};

/*
 * State information for EAP-TLS (RFC2716) and Lightweight EAP:
 *
 *  http://www.missl.cs.umd.edu/wireless/ethereal/leap.txt
 *
 * Attach to all conversations:
 *
 *  a sequence number to be handed to "fragment_add_seq()" as
 *  the fragment sequence number - if it's -1, no reassembly
 *  is in progress, but if it's not, it's the sequence number
 *  to use for the current fragment;
 *
 *  a value to be handed to "fragment_add_seq()" as the
 *  reassembly ID - when a reassembly is started, it's set to
 *  the frame number of the current frame, i.e. the frame
 *  that starts the reassembly;
 *
 *  an indication of the current state of LEAP negotiation,
 *  with -1 meaning no LEAP negotiation is in progress.
 *
 * Attach to frames containing fragments of EAP-TLS messages the
 * reassembly ID for those fragments, so we can find the reassembled
 * data after the first pass through the packets.
 *
 * Attach to LEAP frames the state of the LEAP negotiation when the
 * frame was processed, so we can properly dissect
 * the LEAP message after the first pass through the packets.
 *
 * Attach to all conversations both pieces of information, to keep
 * track of EAP-TLS reassembly and the LEAP state machine.
 */

typedef struct {
  int     eap_tls_seq;
  guint32 eap_reass_cookie;
  int     leap_state;
} conv_state_t;

typedef struct {
  int     info;  /* interpretation depends on EAP message type */
} frame_state_t;

/*********************************************************************
                           EAP-TLS
RFC2716
**********************************************************************/

/*
from RFC2716, pg 17

   Flags

      0 1 2 3 4 5 6 7 8
      +-+-+-+-+-+-+-+-+
      |L M S R R Vers |
      +-+-+-+-+-+-+-+-+

      L = Length included
      M = More fragments
      S = EAP-TLS start
      R = Reserved
      Vers = PEAP version (Reserved for TLS and TTLS)
*/

#define EAP_TLS_FLAG_L 0x80 /* Length included */
#define EAP_TLS_FLAG_M 0x40 /* More fragments  */
#define EAP_TLS_FLAG_S 0x20 /* EAP-TLS start   */

#define EAP_TLS_FLAGS_VERSION 0x07 /* Version mask for PEAP, TTLS, FAST */

/*
 * reassembly of EAP-TLS
 */
static reassembly_table eap_tls_reassembly_table;

static int hf_eap_tls_flags = -1;
static int hf_eap_tls_flag_l = -1;
static int hf_eap_tls_flag_m = -1;
static int hf_eap_tls_flag_s = -1;
static int hf_eap_tls_flags_version = -1;
static int hf_eap_tls_len = -1;
static int hf_eap_tls_fragment  = -1;
static int hf_eap_tls_fragments = -1;
static int hf_eap_tls_fragment_overlap = -1;
static int hf_eap_tls_fragment_overlap_conflict = -1;
static int hf_eap_tls_fragment_multiple_tails = -1;
static int hf_eap_tls_fragment_too_long_fragment = -1;
static int hf_eap_tls_fragment_error = -1;
static int hf_eap_tls_fragment_count = -1;
static int hf_eap_tls_reassembled_length = -1;
static gint ett_eap_tls_fragment  = -1;
static gint ett_eap_tls_fragments = -1;
static gint ett_eap_sim_attr = -1;
static gint ett_eap_aka_attr = -1;
static gint ett_eap_exp_attr = -1;
static gint ett_eap_tls_flags = -1;

static const fragment_items eap_tls_frag_items = {
  &ett_eap_tls_fragment,
  &ett_eap_tls_fragments,
  &hf_eap_tls_fragments,
  &hf_eap_tls_fragment,
  &hf_eap_tls_fragment_overlap,
  &hf_eap_tls_fragment_overlap_conflict,
  &hf_eap_tls_fragment_multiple_tails,
  &hf_eap_tls_fragment_too_long_fragment,
  &hf_eap_tls_fragment_error,
  &hf_eap_tls_fragment_count,
  NULL,
  &hf_eap_tls_reassembled_length,
  /* Reassembled data field */
  NULL,
  "fragments"
};

/**********************************************************************
 Support for EAP Expanded Type.

 Currently this is limited to WifiProtectedSetup. Maybe we need
 a generic method to support EAP extended types ?
*********************************************************************/
static int   hf_eap_ext_vendor_id   = -1;
static int   hf_eap_ext_vendor_type = -1;

/* Vendor-Type and Vendor-id */
#define WFA_VENDOR_ID         0x00372A
#define WFA_SIMPLECONFIG_TYPE 0x1

static const value_string eap_ext_vendor_id_vals[] = {
  { WFA_VENDOR_ID, "WFA" },
  { 0, NULL }
};

static const value_string eap_ext_vendor_type_vals[] = {
  { WFA_SIMPLECONFIG_TYPE, "SimpleConfig" },
  { 0, NULL }
};

static void
dissect_exteap(proto_tree *eap_tree, tvbuff_t *tvb, int offset,
               gint size, packet_info* pinfo)
{

  proto_tree_add_item(eap_tree, hf_eap_ext_vendor_id,   tvb, offset, 3, ENC_BIG_ENDIAN);
  offset += 3;
  size   -= 3;

  proto_tree_add_item(eap_tree, hf_eap_ext_vendor_type, tvb, offset, 4, ENC_BIG_ENDIAN);
  offset += 4;
  size   -= 4;

  /* Generic method to support multiple vendor-defined extended types goes here :-) */
  dissect_exteap_wps(eap_tree, tvb, offset, size, pinfo);
}
/* *********************************************************************
********************************************************************* */

static gboolean
test_flag(unsigned char flag, unsigned char mask)
{
  return ( ( flag & mask ) != 0 );
}

static void
eap_tls_defragment_init(void)
{
  reassembly_table_init(&eap_tls_reassembly_table,
                        &addresses_reassembly_table_functions);
}

static void
dissect_eap_mschapv2(proto_tree *eap_tree, tvbuff_t *tvb, packet_info *pinfo, int offset,
                     gint size)
{
  proto_item *item;
  gint        left = size;
  gint        ms_len;
  guint8      value_size;
  guint8      opcode;

  /* OpCode (1 byte), MS-CHAPv2-ID (1 byte), MS-Length (2 bytes), Data */
  opcode = tvb_get_guint8(tvb, offset);
  proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_opcode, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset += 1;
  left   -= 1;
  if (left <= 0)
    return;

  proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_id, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset += 1;
  left   -= 1;
  if (left <= 0)
    return;

  item = proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_length, tvb, offset, 2, ENC_BIG_ENDIAN);
  ms_len = tvb_get_ntohs(tvb, offset);
  if (ms_len != size)
    expert_add_info(pinfo, item, &ei_eap_ms_chap_v2_length);
  offset += 2;
  left   -= 2;

  switch (opcode) {
  case MS_CHAP_V2_CHALLENGE:
    if (left <= 0)
      break;
    value_size = tvb_get_guint8(tvb, offset);
    proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_value_size,
                        tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;
    left   -= 1;
    proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_challenge,
                        tvb, offset, value_size, ENC_NA);
    offset += value_size;
    left   -= value_size;
    if (left <= 0)
      break;
    proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_name,
                        tvb, offset, left, ENC_ASCII|ENC_NA);
    break;
  case MS_CHAP_V2_RESPONSE:
    if (left <= 0)
      break;
    value_size = tvb_get_guint8(tvb, offset);
    proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_value_size,
                        tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;
    left   -= 1;
    if (value_size == 49) {
      proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_peer_challenge,
                          tvb, offset, 16, ENC_NA);
      offset += 16;
      proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_reserved,
                          tvb, offset, 8, ENC_NA);
      offset += 8;
      proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_nt_response,
                         tvb, offset, 24, ENC_NA);
      offset += 24;
      proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_flags,
                          tvb, offset, 1, ENC_BIG_ENDIAN);
      offset += 1;
      left   -= value_size;
    } else {
      proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_response, tvb, offset, value_size, ENC_NA);
      offset += value_size;
      left   -= value_size;
    }
    if (left <= 0)
      break;
    proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_name, tvb, offset, left, ENC_ASCII|ENC_NA);
    break;
  case MS_CHAP_V2_SUCCESS:
    if (left <= 0)
      break;
    proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_message,
                            tvb, offset, left, ENC_ASCII|ENC_NA);
    break;
  case MS_CHAP_V2_FAILURE:
    if (left <= 0)
      break;
    proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_failure_request,
                            tvb, offset, left, ENC_ASCII|ENC_NA);
    break;
  default:
    proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_data, tvb, offset, left, ENC_NA);
    break;
  }
}

static void
dissect_eap_sim(proto_tree *eap_tree, tvbuff_t *tvb, int offset, gint size)
{
  gint left = size;

  proto_tree_add_item(eap_tree, hf_eap_sim_subtype, tvb, offset, 1, ENC_BIG_ENDIAN);

  offset += 1;
  left   -= 1;

  if (left < 2)
    return;
  proto_tree_add_item(eap_tree, hf_eap_sim_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
  offset += 2;
  left   -= 2;

  /* Rest of EAP-SIM data is in Type-Len-Value format. */
  while (left >= 2) {
    guint8      type, length;
    proto_item *pi;
    proto_tree *attr_tree;
    int         aoffset;
    gint        aleft;

    aoffset = offset;
    type    = tvb_get_guint8(tvb, aoffset);
    length  = tvb_get_guint8(tvb, aoffset + 1);
    aleft   = 4 * length;

    pi = proto_tree_add_none_format(eap_tree, hf_eap_sim_subtype_attribute, tvb,
                                    aoffset, aleft, "EAP-SIM Attribute: %s (%d)",
                                    val_to_str_ext_const(type,
                                                         &eap_sim_aka_attribute_vals_ext,
                                                         "Unknown"),
                                    type);
    attr_tree = proto_item_add_subtree(pi, ett_eap_sim_attr);
    proto_tree_add_uint(attr_tree, hf_eap_sim_subtype_type, tvb, aoffset, 1, type);
    aoffset += 1;
    aleft   -= 1;

    if (aleft <= 0)
      break;
    proto_tree_add_item(attr_tree, hf_eap_sim_subtype_length, tvb, aoffset, 1, ENC_BIG_ENDIAN);
    aoffset += 1;
    aleft   -= 1;
    proto_tree_add_item(attr_tree, hf_eap_sim_subtype_value, tvb, aoffset, aleft, ENC_NA);

    offset += 4 * length;
    left   -= 4 * length;
  }
}

static void
dissect_eap_aka(proto_tree *eap_tree, tvbuff_t *tvb, int offset, gint size)
{
  gint left = size;
  proto_tree_add_item(eap_tree, hf_eap_aka_subtype, tvb, offset, 1, ENC_BIG_ENDIAN);

  offset += 1;
  left   -= 1;

  if (left < 2)
    return;
  proto_tree_add_item(eap_tree, hf_eap_aka_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
  offset += 2;
  left   -= 2;

  /* Rest of EAP-AKA data is in Type-Len-Value format. */
  while (left >= 2) {
    guint8       type, length;
    proto_item  *pi;
    proto_tree  *attr_tree;
    int          aoffset;
    gint         aleft;

    aoffset = offset;
    type    = tvb_get_guint8(tvb, aoffset);
    length  = tvb_get_guint8(tvb, aoffset + 1);
    aleft   = 4 *  length;

    pi = proto_tree_add_none_format(eap_tree, hf_eap_aka_subtype_attribute, tvb,
                                    aoffset, aleft, "EAP-AKA Attribute: %s (%d)",
                                    val_to_str_ext_const(type,
                                                         &eap_sim_aka_attribute_vals_ext,
                                                         "Unknown"),
                                    type);
    attr_tree = proto_item_add_subtree(pi, ett_eap_aka_attr);
    proto_tree_add_uint(attr_tree, hf_eap_aka_subtype_type, tvb, aoffset, 1, type);
    aoffset += 1;
    aleft   -= 1;

    if (aleft <= 0)
      break;
    proto_tree_add_item(attr_tree, hf_eap_aka_subtype_length, tvb, aoffset, 1, ENC_BIG_ENDIAN);
    aoffset += 1;
    aleft   -= 1;
    proto_tree_add_item(attr_tree, hf_eap_aka_subtype_value, tvb, aoffset, aleft, ENC_NA);

    offset += 4 * length;
    left   -= 4 * length;
  }
}

static int
dissect_eap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
  guint8          eap_code;
  guint16         eap_len;
  guint8          eap_type;
  gint            len;
  conversation_t *conversation;
  conv_state_t   *conversation_state;
  frame_state_t  *packet_state;
  int             leap_state;
  proto_tree     *ti;
  proto_tree     *eap_tree           = NULL;
  proto_tree     *eap_tls_flags_tree = NULL;
  proto_item     *eap_type_item      = NULL;

  col_set_str(pinfo->cinfo, COL_PROTOCOL, "EAP");
  col_clear(pinfo->cinfo, COL_INFO);

  eap_code = tvb_get_guint8(tvb, 0);

  col_add_str(pinfo->cinfo, COL_INFO,
                val_to_str(eap_code, eap_code_vals, "Unknown code (0x%02X)"));

  /*
   * Find a conversation to which we belong; create one if we don't find
   * it.
   *
   * We use the source and destination addresses, and the *matched* port
   * number, because if this is running over RADIUS, there's no guarantee
   * that the source port number for request and the destination port
   * number for replies will be the same in all messages - the client
   * may use different port numbers for each request.
   *
   * We have to pair up the matched port number with the corresponding
   * address; we determine which that is by comparing it with the
   * destination port - if it matches, we matched on the destination
   * port (this is a request), otherwise we matched on the source port
   * (this is a reply).
   *
   * XXX - what if we're running over a TCP or UDP protocol with a
   * heuristic dissector, meaning the matched port number won't be set?
   *
   * XXX - what if we have a capture file with captures on multiple
   * PPP interfaces, with LEAP traffic on all of them?  How can we
   * keep them separate?  (Or is that not going to happen?)
   */
  if (pinfo->destport == pinfo->match_uint) {
    conversation = find_conversation(pinfo->fd->num, &pinfo->dst, &pinfo->src,
                                     pinfo->ptype, pinfo->destport,
                                     0, NO_PORT_B);
  } else {
    conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
                                     pinfo->ptype, pinfo->srcport,
                                     0, NO_PORT_B);
  }
  if (conversation == NULL) {
    if (pinfo->destport == pinfo->match_uint) {
      conversation = conversation_new(pinfo->fd->num, &pinfo->dst, &pinfo->src,
                                      pinfo->ptype, pinfo->destport,
                                      0, NO_PORT2);
    } else {
      conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst,
                                      pinfo->ptype, pinfo->srcport,
                                      0, NO_PORT2);
    }
  }

  /*
   * Get the state information for the conversation; attach some if
   * we don't find it.
   */
  conversation_state = (conv_state_t *)conversation_get_proto_data(conversation, proto_eap);
  if (conversation_state == NULL) {
    /*
     * Attach state information to the conversation.
     */
    conversation_state = wmem_new(wmem_file_scope(), conv_state_t);
    conversation_state->eap_tls_seq      = -1;
    conversation_state->eap_reass_cookie =  0;
    conversation_state->leap_state       = -1;
    conversation_add_proto_data(conversation, proto_eap, conversation_state);
  }

  /*
   * Set this now, so that it gets remembered even if we throw an exception
   * later.
   */
  if (eap_code == EAP_FAILURE)
    conversation_state->leap_state = -1;

  eap_len = tvb_get_ntohs(tvb, 2);
  len     = eap_len;

  if (tree) {
    ti = proto_tree_add_item(tree, proto_eap, tvb, 0, len, ENC_NA);
    eap_tree = proto_item_add_subtree(ti, ett_eap);

    proto_tree_add_item(eap_tree, hf_eap_code,       tvb, 0, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(eap_tree, hf_eap_identifier, tvb, 1, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(eap_tree, hf_eap_len,        tvb, 2, 2, ENC_BIG_ENDIAN);
  }

  switch (eap_code) {

  case EAP_SUCCESS:
  case EAP_FAILURE:
    break;

  case EAP_REQUEST:
  case EAP_RESPONSE:
    eap_type = tvb_get_guint8(tvb, 4);

    col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
                      val_to_str_ext(eap_type, &eap_type_vals_ext,
                                     "Unknown type (0x%02x)"));
    if (tree)
      eap_type_item = proto_tree_add_item(eap_tree, hf_eap_type, tvb, 4, 1, ENC_BIG_ENDIAN);

    if ((len > 5) || ((len == 5) && (eap_type == EAP_TYPE_ID))) {
      int     offset = 5;
      gint    size   = len - offset;

      switch (eap_type) {
        /*********************************************************************
        **********************************************************************/
      case EAP_TYPE_ID:
        if (tree) {
          proto_tree_add_item(eap_tree, hf_eap_identity, tvb, offset, size, ENC_ASCII|ENC_NA);
        }
        if(!pinfo->fd->flags.visited) {
          conversation_state->leap_state  =  0;
          conversation_state->eap_tls_seq = -1;
        }
        break;

        /*********************************************************************
        **********************************************************************/
      case EAP_TYPE_NOTIFY:
        if (tree) {
          proto_tree_add_item(eap_tree, hf_eap_notification, tvb,
                              offset, size, ENC_ASCII|ENC_NA);
        }
        break;

        /*********************************************************************
        **********************************************************************/
      case EAP_TYPE_NAK:
        if (tree) {
          proto_tree_add_item(eap_tree, hf_eap_type_nak, tvb,
                              offset, 1, ENC_BIG_ENDIAN);
        }
        break;
        /*********************************************************************
        **********************************************************************/
      case EAP_TYPE_MD5:
      {
        guint8      value_size = tvb_get_guint8(tvb, offset);
        gint        extra_len  = size - 1 - value_size;
        proto_item *item;

        /* Warn that this is an insecure EAP type. */
        expert_add_info(pinfo, eap_type_item, &ei_eap_mitm_attacks);

        item = proto_tree_add_item(eap_tree, hf_eap_md5_value_size, tvb, offset, 1, ENC_BIG_ENDIAN);
        if (value_size > (size - 1))
        {
          expert_add_info(pinfo, item, &ei_eap_md5_value_size_overflow);
          value_size = size - 1;
        }

        offset += 1;
        proto_tree_add_item(eap_tree, hf_eap_md5_value, tvb, offset, value_size, ENC_NA);
        offset += value_size;
        if (extra_len > 0) {
          proto_tree_add_item(eap_tree, hf_eap_md5_extra_data, tvb, offset, extra_len, ENC_NA);
        }
      }
      break;

      /*********************************************************************
                                EAP-TLS
      **********************************************************************/
      case EAP_TYPE_FAST:
      case EAP_TYPE_PEAP:
      case EAP_TYPE_TTLS:
      case EAP_TYPE_TLS:
      {
        guint8   flags            = tvb_get_guint8(tvb, offset);
        gboolean more_fragments;
        gboolean has_length;
        gboolean is_start;
        int      eap_tls_seq      = -1;
        guint32  eap_reass_cookie =  0;
        gboolean needs_reassembly =  FALSE;

        more_fragments = test_flag(flags,EAP_TLS_FLAG_M);
        has_length     = test_flag(flags,EAP_TLS_FLAG_L);
        is_start       = test_flag(flags,EAP_TLS_FLAG_S);

        if (is_start)
          conversation_state->eap_tls_seq = -1;

        /* Flags field, 1 byte */
        if (tree) {
          ti = proto_tree_add_item(eap_tree, hf_eap_tls_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
          eap_tls_flags_tree = proto_item_add_subtree(ti, ett_eap_tls_flags);
          proto_tree_add_item(eap_tls_flags_tree, hf_eap_tls_flag_l, tvb, offset, 1, ENC_BIG_ENDIAN);
          proto_tree_add_item(eap_tls_flags_tree, hf_eap_tls_flag_m, tvb, offset, 1, ENC_BIG_ENDIAN);
          proto_tree_add_item(eap_tls_flags_tree, hf_eap_tls_flag_s, tvb, offset, 1, ENC_BIG_ENDIAN);

          if ((eap_type == EAP_TYPE_PEAP) || (eap_type == EAP_TYPE_TTLS) ||
              (eap_type == EAP_TYPE_FAST)) {
            proto_tree_add_item(eap_tls_flags_tree, hf_eap_tls_flags_version, tvb, offset, 1, ENC_BIG_ENDIAN);
          }
        }
        size   -= 1;
        offset += 1;

        /* Length field, 4 bytes, OPTIONAL. */
        if (has_length) {
          if (tree)
            proto_tree_add_item(eap_tree, hf_eap_tls_len, tvb, offset, 4, ENC_BIG_ENDIAN);
          size   -= 4;
          offset += 4;
        }

        if (size > 0) {

          tvbuff_t *next_tvb;
          gint      tvb_len;
          gboolean  save_fragmented;

          tvb_len = tvb_length_remaining(tvb, offset);
          if (size < tvb_len)
            tvb_len = size;

          /*
            EAP/TLS is weird protocol (it comes from
            Microsoft after all).

            If we have series of fragmented packets,
            then there's no way of knowing that from
            the packet itself, if it is the last packet
            in series, that is that the packet part of
            bigger fragmented set of data.

            The only way to know is, by knowing
            that we are already in defragmentation
            "mode" and we are expecing packet
            carrying fragment of data. (either
            because we have not received expected
            amount of data, or because the packet before
            had "F"ragment flag set.)

            The situation is alleviated by fact that it
            is simple ack/nack protcol so there's no
            place for out-of-order packets like it is
            possible with IP.

            Anyway, point of this lengthy essay is that
            we have to keep state information in the
            conversation, so that we can put ourselves in
            defragmenting mode and wait for the last packet,
            and have to attach state to frames as well, so
            that we can handle defragmentation after the
            first pass through the capture.
          */
          /* See if we have a remembered defragmentation EAP ID. */
          packet_state = (frame_state_t *)p_get_proto_data(wmem_file_scope(), pinfo, proto_eap, 0);
          if (packet_state == NULL) {
            /*
             * We haven't - does this message require reassembly?
             */
            if (!pinfo->fd->flags.visited) {
              /*
               * This is the first time we've looked at this frame,
               * so it wouldn't have any remembered information.
               *
               * Therefore, we check whether this conversation has
               * a reassembly operation in progress, or whether
               * this frame has the Fragment flag set.
               */
              if (conversation_state->eap_tls_seq != -1) {
                /*
                 * There's a reassembly in progress; the sequence number
                 * of the previous fragment is
                 * "conversation_state->eap_tls_seq", and the reassembly
                 * ID is "conversation_state->eap_reass_cookie".
                 *
                 * We must include this frame in the reassembly.
                 * We advance the sequence number, giving us the
                 * sequence number for this fragment.
                 */
                needs_reassembly = TRUE;
                conversation_state->eap_tls_seq++;

                eap_reass_cookie = conversation_state->eap_reass_cookie;
                eap_tls_seq = conversation_state->eap_tls_seq;
              } else if (more_fragments && has_length) {
                /*
                 * This message has the Fragment flag set, so it requires
                 * reassembly.  It's the message containing the first
                 * fragment (if it's a later fragment, the sequence
                 * number in the conversation state would not be -1).
                 *
                 * If it doesn't include a length, however, we can't
                 * do reassembly (either the message is in error, as
                 * the first fragment *must* contain a length, or we
                 * didn't capture the first fragment, and this just
                 * happens to be the first fragment we saw), so we
                 * also check that we have a length;
                 */
                needs_reassembly = TRUE;
                conversation_state->eap_reass_cookie = pinfo->fd->num;

                /*
                 * Start the reassembly sequence number at 0.
                 */
                conversation_state->eap_tls_seq = 0;

                eap_tls_seq = conversation_state->eap_tls_seq;
                eap_reass_cookie = conversation_state->eap_reass_cookie;
              }

              if (needs_reassembly) {
                /*
                 * This frame requires reassembly; remember the reassembly
                 * ID for subsequent accesses to it.
                 */
                packet_state = wmem_new(wmem_file_scope(), frame_state_t);
                packet_state->info = eap_reass_cookie;
                p_add_proto_data(wmem_file_scope(), pinfo, proto_eap, 0, packet_state);
              }
            }
          } else {
            /*
             * This frame has a reassembly cookie associated with it, so
             * it requires reassembly.  We've already done the
             * reassembly in the first pass, so "fragment_add_seq()"
             * won't look at the sequence number; set it to 0.
             *
             * XXX - a frame isn't supposed to have more than one
             * EAP message in it, but if it includes both an EAP-TLS
             * message and a LEAP message, we might be mistakenly
             * concluding it requires reassembly because the "info"
             * field isn't -1.  We could, I guess, pack both EAP-TLS
             * ID and LEAP state into the structure, but that doesn't
             * work if you have multiple EAP-TLS or LEAP messages in
             * the frame.
             *
             * But it's not clear how much work we should do to handle
             * a bogus message such as that; as long as we don't crash
             * or do something else equally horrible, we may not
             * have to worry about this at all.
             */
            needs_reassembly = TRUE;
            eap_reass_cookie = packet_state->info;
            eap_tls_seq = 0;
          }

          /*
            We test here to see whether EAP-TLS packet
            carry fragmented of TLS data.

            If this is the case, we do reasembly below,
            otherwise we just call dissector.
          */
          if (needs_reassembly) {
            fragment_head   *fd_head;

            /*
             * Yes, this frame contains a fragment that requires
             * reassembly.
             */
            save_fragmented   = pinfo->fragmented;
            pinfo->fragmented = TRUE;
            fd_head = fragment_add_seq(&eap_tls_reassembly_table,
                                       tvb, offset,
                                       pinfo, eap_reass_cookie, NULL,
                                       eap_tls_seq,
                                       size,
                                       more_fragments, 0);

            if (fd_head != NULL)            /* Reassembled  */
            {
              proto_item *frag_tree_item;

              next_tvb = tvb_new_chain(tvb, fd_head->tvb_data);
              add_new_data_source(pinfo, next_tvb, "Reassembled EAP-TLS");

              show_fragment_seq_tree(fd_head, &eap_tls_frag_items,
                                     eap_tree, pinfo, next_tvb, &frag_tree_item);

              call_dissector(ssl_handle, next_tvb, pinfo, eap_tree);

              /*
               * We're finished reassembing this frame.
               * Reinitialize the reassembly state.
               */
              if (!pinfo->fd->flags.visited)
                conversation_state->eap_tls_seq = -1;
            }

            pinfo->fragmented = save_fragmented;

          } else { /* this data is NOT fragmented */
            next_tvb = tvb_new_subset(tvb, offset, tvb_len, size);
            call_dissector(ssl_handle, next_tvb, pinfo, eap_tree);
          }
        }
      }
      break; /*  EAP_TYPE_TLS */

      /*********************************************************************
                                Cisco's Lightweight EAP (LEAP)
    http://www.missl.cs.umd.edu/wireless/ethereal/leap.txt
      **********************************************************************/
      case EAP_TYPE_LEAP:
      {
        guint8 count, namesize;

        /* Warn that this is an insecure EAP type. */
        expert_add_info(pinfo, eap_type_item, &ei_eap_dictionary_attacks);

        /* Version (byte) */
        if (tree) {
          proto_tree_add_item(eap_tree, hf_eap_leap_version, tvb, offset, 1, ENC_BIG_ENDIAN);
        }
        offset += 1;

        /* Unused  (byte) */
        if (tree) {
          proto_tree_add_item(eap_tree, hf_eap_leap_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
        }
        offset += 1;

        /* Count   (byte) */
        count = tvb_get_guint8(tvb, offset);
        if (tree) {
          proto_tree_add_item(eap_tree, hf_eap_leap_count, tvb, offset, 1, ENC_BIG_ENDIAN);
        }
        offset += 1;

        /* Data    (byte*Count) */
        /* This part is state-dependent. */

        /* See if we've already remembered the state. */
        packet_state = (frame_state_t *)p_get_proto_data(wmem_file_scope(), pinfo, proto_eap, 0);
        if (packet_state == NULL) {
          /*
           * We haven't - compute the state based on the current
           * state in the conversation.
           */
          leap_state = conversation_state->leap_state;

          /* Advance the state machine. */
          if (leap_state==0) leap_state =  1; else
            if (leap_state==1) leap_state =  2; else
              if (leap_state==2) leap_state =  3; else
                if (leap_state==3) leap_state =  4; else
                  if (leap_state==4) leap_state = -1;

          /*
           * Remember the state for subsequent accesses to this
           * frame.
           */
          packet_state = wmem_new(wmem_file_scope(), frame_state_t);
          packet_state->info = leap_state;
          p_add_proto_data(wmem_file_scope(), pinfo, proto_eap, 0, packet_state);

          /*
           * Update the conversation's state.
           */
          conversation_state->leap_state = leap_state;
        }

        /* Get the remembered state. */
        leap_state = packet_state->info;

        if (tree) {
          switch (leap_state) {
          case 1:
            proto_tree_add_item(eap_tree, hf_eap_leap_peer_challenge, tvb, offset, count, ENC_NA);
            break;

          case 2:
            proto_tree_add_item(eap_tree, hf_eap_leap_peer_response, tvb, offset, count, ENC_NA);
            break;

          case 3:
            proto_tree_add_item(eap_tree, hf_eap_leap_ap_challenge, tvb, offset, count, ENC_NA);
            break;

          case 4:
            proto_tree_add_item(eap_tree, hf_eap_leap_ap_response, tvb, offset, count, ENC_NA);
            break;

          default:
            proto_tree_add_item(eap_tree, hf_eap_leap_data, tvb, offset, count, ENC_NA);
            break;
          }
        }

        offset += count;

        /* Name    (Length-(8+Count)) */
        namesize = eap_len - (8+count);
        if (tree) {
          proto_tree_add_item(eap_tree, hf_eap_leap_name, tvb, offset, namesize, ENC_ASCII|ENC_NA);
        }
      }

      break; /* EAP_TYPE_LEAP */

      /*********************************************************************
            EAP-MSCHAPv2 - draft-kamath-pppext-eap-mschapv2-00.txt
      **********************************************************************/
      case EAP_TYPE_MSCHAPV2:
        dissect_eap_mschapv2(eap_tree, tvb, pinfo, offset, size);
        break; /* EAP_TYPE_MSCHAPV2 */

        /*********************************************************************
           EAP-SIM - draft-haverinen-pppext-eap-sim-13.txt
        **********************************************************************/
      case EAP_TYPE_SIM:
        if (tree)
          dissect_eap_sim(eap_tree, tvb, offset, size);
        break; /* EAP_TYPE_SIM */

        /*********************************************************************
            EAP-AKA - draft-arkko-pppext-eap-aka-12.txt
        **********************************************************************/
      case EAP_TYPE_AKA:
      case EAP_TYPE_AKA_PRIME:
        if (tree)
          dissect_eap_aka(eap_tree, tvb, offset, size);
        break; /* EAP_TYPE_AKA */

        /*********************************************************************
            EAP Expanded Type
        **********************************************************************/
      case EAP_TYPE_EXT:
      {
        proto_tree *exptree;

        exptree   = proto_tree_add_subtree(eap_tree, tvb, offset, size, ett_eap_exp_attr, NULL, "Expanded Type");
        dissect_exteap(exptree, tvb, offset, size, pinfo);
      }
      break;

      /*********************************************************************
      **********************************************************************/
      default:
        proto_tree_add_item(eap_tree, hf_eap_data, tvb, offset, size, ENC_NA);
        break;
        /*********************************************************************
        **********************************************************************/
      } /* switch (eap_type) */

    }

  } /* switch (eap_code) */

  return tvb_length(tvb);
}

void
proto_register_eap(void)
{
  static hf_register_info hf[] = {
     { &hf_eap_code, {
      "Code", "eap.code",
      FT_UINT8, BASE_DEC, VALS(eap_code_vals), 0x0,
      NULL, HFILL }},

    { &hf_eap_identifier, {
      "Id", "eap.id",
      FT_UINT8, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_len, {
      "Length", "eap.len",
      FT_UINT16, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_type, {
      "Type", "eap.type",
      FT_UINT8, BASE_DEC|BASE_EXT_STRING, &eap_type_vals_ext, 0x0,
      NULL, HFILL }},

    { &hf_eap_type_nak, {
      "Desired Auth Type", "eap.desired_type",
      FT_UINT8, BASE_DEC|BASE_EXT_STRING, &eap_type_vals_ext, 0x0,
      NULL, HFILL }},

    { &hf_eap_identity, {
      "Identity", "eap.identity",
      FT_STRING, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_notification, {
      "Notification", "eap.notification",
      FT_STRING, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_md5_value_size, {
      "EAP-MD5 Value-Size", "eap.md5.value_size",
      FT_UINT8, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_md5_value, {
      "EAP-MD5 Value", "eap.md5.value",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_md5_extra_data, {
      "EAP-MD5 Extra Data", "eap.md5.extra_data",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_tls_flags, {
      "EAP-TLS Flags", "eap.tls.flags",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_tls_flag_l, {
      "Length Included", "eap.tls.flags.len_included",
      FT_BOOLEAN, 8, NULL, EAP_TLS_FLAG_L,
      NULL, HFILL }},

    { &hf_eap_tls_flag_m, {
      "More Fragments", "eap.tls.flags.more_fragments",
      FT_BOOLEAN, 8, NULL, EAP_TLS_FLAG_M,
      NULL, HFILL }},

    { &hf_eap_tls_flag_s, {
      "Start", "eap.tls.flags.start",
      FT_BOOLEAN, 8, NULL, EAP_TLS_FLAG_S,
      NULL, HFILL }},

    { &hf_eap_tls_flags_version, {
      "Version", "eap.tls.flags.version",
      FT_UINT8, BASE_DEC, NULL, EAP_TLS_FLAGS_VERSION,
      NULL, HFILL }},

    { &hf_eap_tls_len, {
      "EAP-TLS Length", "eap.tls.len",
      FT_UINT32, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_tls_fragment, {
      "EAP-TLS Fragment", "eap.tls.fragment",
      FT_FRAMENUM, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_tls_fragments, {
      "EAP-TLS Fragments", "eap.tls.fragments",
      FT_NONE, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_tls_fragment_overlap, {
      "Fragment Overlap", "eap.tls.fragment.overlap",
      FT_BOOLEAN, BASE_NONE, NULL, 0x0,
      "Fragment overlaps with other fragments", HFILL }},

    { &hf_eap_tls_fragment_overlap_conflict, {
      "Conflicting Data In Fragment Overlap", "eap.tls.fragment.overlap_conflict",
      FT_BOOLEAN, BASE_NONE, NULL, 0x0,
      "Overlapping fragments contained conflicting data", HFILL }},

    { &hf_eap_tls_fragment_multiple_tails, {
      "Multiple Tail Fragments Found", "eap.tls.fragment.multiple_tails",
      FT_BOOLEAN, BASE_NONE, NULL, 0x0,
      "Several tails were found when defragmenting the packet", HFILL }},

    { &hf_eap_tls_fragment_too_long_fragment,{
      "Fragment Too Long", "eap.tls.fragment.fragment.too_long",
      FT_BOOLEAN, BASE_NONE, NULL, 0x0,
      "Fragment contained data past end of packet", HFILL }},

    { &hf_eap_tls_fragment_error, {
      "Defragmentation Error", "eap.tls.fragment.error",
      FT_FRAMENUM, BASE_NONE, NULL, 0x0,
      "Defragmentation error due to illegal fragments", HFILL }},

    { &hf_eap_tls_fragment_count, {
      "Fragment Count", "eap.tls.fragment.count",
      FT_UINT32, BASE_DEC, NULL, 0x0,
      "Total length of the reassembled payload", HFILL }},

    { &hf_eap_tls_reassembled_length, {
      "Reassembled EAP-TLS Length", "eap.tls.reassembled.len",
      FT_UINT32, BASE_DEC, NULL, 0x0,
      "Total length of the reassembled payload", HFILL }},

    { &hf_eap_sim_subtype, {
      "EAP-SIM Subtype", "eap.sim.subtype",
      FT_UINT8, BASE_DEC, VALS(eap_sim_subtype_vals), 0x0,
      NULL, HFILL }},

    { &hf_eap_sim_reserved, {
      "EAP-SIM Reserved", "eap.sim.reserved",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_sim_subtype_attribute, {
      "EAP-SIM Attribute", "eap.sim.subtype.attribute",
      FT_NONE, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_sim_subtype_type, {
      "EAP-SIM Type", "eap.sim.subtype.type",
      FT_UINT8, BASE_DEC|BASE_EXT_STRING, &eap_sim_aka_attribute_vals_ext, 0x0,
      NULL, HFILL }},

    { &hf_eap_sim_subtype_length, {
      "EAP-SIM Length", "eap.sim.subtype.len",
      FT_UINT8, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_sim_subtype_value, {
      "EAP-SIM Value", "eap.sim.subtype.value",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_aka_subtype, {
      "EAP-AKA Subtype", "eap.aka.subtype",
      FT_UINT8, BASE_DEC, VALS(eap_aka_subtype_vals), 0x0,
      NULL, HFILL }},

    { &hf_eap_aka_reserved, {
      "EAP-AKA Reserved", "eap.aka.reserved",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_aka_subtype_attribute, {
      "EAP-AKA Attribute", "eap.aka.subtype.attribute",
      FT_NONE, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_aka_subtype_type, {
      "EAP-AKA Type", "eap.aka.subtype.type",
      FT_UINT8, BASE_DEC|BASE_EXT_STRING, &eap_sim_aka_attribute_vals_ext, 0x0,
      NULL, HFILL }},

    { &hf_eap_aka_subtype_length, {
      "EAP-AKA Length", "eap.aka.subtype.len",
      FT_UINT8, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_aka_subtype_value, {
      "EAP-AKA Value", "eap.aka.subtype.value",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_leap_version, {
      "EAP-LEAP Version", "eap.leap.version",
      FT_UINT8, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_leap_reserved, {
      "EAP-LEAP Reserved", "eap.leap.reserved",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_leap_count, {
      "EAP-LEAP Count", "eap.leap.count",
      FT_UINT8, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_leap_peer_challenge, {
      "EAP-LEAP Peer-Challenge", "eap.leap.peer_challenge",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_leap_peer_response, {
      "EAP-LEAP Peer-Response", "eap.leap.peer_response",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_leap_ap_challenge, {
      "EAP-LEAP AP-Challenge", "eap.leap.ap_challenge",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_leap_ap_response, {
      "EAP-LEAP AP-Response", "eap.leap.ap_response",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_leap_data, {
      "EAP-LEAP Data", "eap.leap.data",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_leap_name, {
      "EAP-LEAP Name", "eap.leap.name",
      FT_STRING, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_opcode, {
      "EAP-MS-CHAP-v2 OpCode", "eap.ms_chap_v2.opcode",
      FT_UINT8, BASE_DEC, VALS(eap_ms_chap_v2_opcode_vals), 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_id, {
      "EAP-MS-CHAP-v2 Id", "eap.ms_chap_v2.id",
      FT_UINT8, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_length, {
      "EAP-MS-CHAP-v2 Length", "eap.ms_chap_v2.length",
      FT_UINT16, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_value_size, {
      "EAP-MS-CHAP-v2 Value-Size", "eap.ms_chap_v2.value_size",
      FT_UINT8, BASE_DEC, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_challenge, {
      "EAP-MS-CHAP-v2 Challenge", "eap.ms_chap_v2.challenge",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_name, {
      "EAP-MS-CHAP-v2 Name", "eap.ms_chap_v2.name",
      FT_STRING, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_peer_challenge, {
      "EAP-MS-CHAP-v2 Peer-Challenge", "eap.ms_chap_v2.peer_challenge",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_reserved, {
      "EAP-MS-CHAP-v2 Reserved", "eap.ms_chap_v2.reserved",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_nt_response, {
      "EAP-MS-CHAP-v2 NT-Response", "eap.ms_chap_v2.nt_response",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_flags, {
      "EAP-MS-CHAP-v2 Flags", "eap.ms_chap_v2.flags",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_response, {
      "EAP-MS-CHAP-v2 Response (Unknown Length)", "eap.ms_chap_v2.response",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_message, {
      "EAP-MS-CHAP-v2 Message", "eap.ms_chap_v2.message",
      FT_STRING, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_failure_request, {
      "EAP-MS-CHAP-v2 Failure-Request", "eap.ms_chap_v2.failure_request",
      FT_STRING, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_ms_chap_v2_data, {
      "EAP-MS-CHAP-v2 Data", "eap.ms_chap_v2.data",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    { &hf_eap_data, {
      "EAP Data", "eap.data",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }},

    /* Expanded type fields */
    { &hf_eap_ext_vendor_id, {
      "EAP-EXT Vendor Id", "eap.ext.vendor_id",
      FT_UINT16, BASE_HEX, VALS(eap_ext_vendor_id_vals), 0x0,
      NULL, HFILL }},

    { &hf_eap_ext_vendor_type, {
      "EAP-EXT Vendor Type", "eap.ext.vendor_type",
      FT_UINT8, BASE_HEX, VALS(eap_ext_vendor_type_vals), 0x0,
      NULL, HFILL }}
  };
  static gint *ett[] = {
    &ett_eap,
    &ett_eap_tls_fragment,
    &ett_eap_tls_fragments,
    &ett_eap_sim_attr,
    &ett_eap_aka_attr,
    &ett_eap_exp_attr,
    &ett_eap_tls_flags
  };
  static ei_register_info ei[] = {
     { &ei_eap_ms_chap_v2_length, { "eap.ms_chap_v2.length.invalid", PI_PROTOCOL, PI_WARN, "Invalid Length", EXPFILL }},
     { &ei_eap_mitm_attacks, { "eap.mitm_attacks", PI_SECURITY, PI_WARN, "Vulnerable to MITM attacks. If possible, change EAP type.", EXPFILL }},
     { &ei_eap_md5_value_size_overflow, { "eap.md5.value_size.overflow", PI_PROTOCOL, PI_WARN, "Overflow", EXPFILL }},
     { &ei_eap_dictionary_attacks, { "eap.dictionary_attacks", PI_SECURITY, PI_WARN,
                               "Vulnerable to dictionary attacks. If possible, change EAP type."
                               " See http://www.cisco.com/warp/public/cc/pd/witc/ao350ap/prodlit/2331_pp.pdf", EXPFILL }},
  };

  expert_module_t* expert_eap;

  proto_eap = proto_register_protocol("Extensible Authentication Protocol",
                                      "EAP", "eap");
  proto_register_field_array(proto_eap, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));
  expert_eap = expert_register_protocol(proto_eap);
  expert_register_field_array(expert_eap, ei, array_length(ei));

  eap_handle = new_register_dissector("eap", dissect_eap, proto_eap);
  register_init_routine(eap_tls_defragment_init);
}

void
proto_reg_handoff_eap(void)
{
  /*
   * Get a handle for the SSL/TLS dissector.
   */
  ssl_handle = find_dissector("ssl");

  dissector_add_uint("ppp.protocol", PPP_EAP, eap_handle);
}
/*
 * Editor modelines
 *
 * Local Variables:
 * c-basic-offset: 2
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * ex: set shiftwidth=2 tabstop=8 expandtab:
 * :indentSize=2:tabSize=8:noTabs=true:
 */