aboutsummaryrefslogtreecommitdiffstats
path: root/epan/dissectors/packet-negoex.c
blob: c1760b2762ae944f1ed242d85417a5f56ec2e598 (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
/* packet-negoex.c
 * Dissect the NEGOEX security protocol
 * as described here: http://tools.ietf.org/id/draft-zhu-negoex-04.txt
 * Copyright 2012 Richard Sharpe <realrichardsharpe@gmail.com>
 * Routines for SPNEGO Extended Negotiation Security Mechanism
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/exceptions.h>
#include <epan/show_exception.h>

#include "packet-dcerpc.h"
#include "packet-gssapi.h"

void proto_register_negoex(void);
void proto_reg_handoff_negoex(void);

static int proto_negoex = -1;
static int hf_negoex_sig = -1;
static int hf_negoex_message_type = -1;
static int hf_negoex_sequence_num = -1;
static int hf_negoex_header_len = -1;
static int hf_negoex_message_len = -1;
static int hf_negoex_conversation_id = -1;
static int hf_negoex_random = -1;
static int hf_negoex_proto_version = -1;
static int hf_negoex_authscheme = -1;
static int hf_negoex_authscheme_vector_offset = -1;
static int hf_negoex_authscheme_vector_count = -1;
static int hf_negoex_authscheme_vector_pad = -1;
static int hf_negoex_extension = -1;
static int hf_negoex_extension_vector_offset = -1;
static int hf_negoex_extension_vector_count = -1;
static int hf_negoex_extension_vector_pad = -1;
static int hf_negoex_exchange_vector_offset = -1;
static int hf_negoex_exchange_vector_count = -1;
static int hf_negoex_exchange_vector_pad = -1;
static int hf_negoex_exchange = -1;
static int hf_negoex_checksum_scheme = -1;
static int hf_negoex_checksum_type = -1;
static int hf_negoex_checksum_vector_offset = -1;
static int hf_negoex_checksum_vector_count = -1;
static int hf_negoex_checksum_vector_pad = -1;
static int hf_negoex_checksum = -1;
static int hf_negoex_errorcode = -1;
static int hf_negoex_data = -1;

static gint ett_negoex = -1;
static gint ett_negoex_msg = -1;
static gint ett_negoex_hdr = -1;
static gint ett_negoex_authscheme_vector = -1;
static gint ett_negoex_extension_vector = -1;
static gint ett_negoex_exchange = -1;
static gint ett_negoex_checksum = -1;
static gint ett_negoex_checksum_vector = -1;
static gint ett_negoex_byte_vector = -1;

static dissector_handle_t negoex_handle;

/* If you add more message types, add them in sequence and update MAX_MSG */
#define MESSAGE_TYPE_INITIATOR_NEGO      0
#define MESSAGE_TYPE_ACCEPTOR_NEGO       1
#define MESSAGE_TYPE_INITIATOR_META_DATA 2
#define MESSAGE_TYPE_ACCEPTOR_META_DATA  3
#define MESSAGE_TYPE_CHALLENGE           4
#define MESSAGE_TYPE_AP_REQUEST          5
#define MESSAGE_TYPE_VERIFY              6
#define MESSAGE_TYPE_ALERT               7
#define MESSAGE_TYPE_MAX_MSG             MESSAGE_TYPE_ALERT

static const value_string negoex_message_types[] = {
  {MESSAGE_TYPE_INITIATOR_NEGO,      "INITATOR_NEGO"},
  {MESSAGE_TYPE_ACCEPTOR_NEGO,       "ACCEPTOR_NEGO"},
  {MESSAGE_TYPE_INITIATOR_META_DATA, "INITIATOR_META_DATA"},
  {MESSAGE_TYPE_ACCEPTOR_META_DATA,  "ACCEPTOR_META_DATA"},
  {MESSAGE_TYPE_CHALLENGE,           "CHALLENGE"},
  {MESSAGE_TYPE_AP_REQUEST,          "AP_REQUEST"},
  {MESSAGE_TYPE_VERIFY,              "VERIFY"},
  {MESSAGE_TYPE_ALERT,               "ALERT"},
  {0, NULL}
};

static const value_string checksum_schemes[] = {
  {1, "rfc3961"},
  {0, NULL}
};

#if 0
static const value_string alert_types[] = {
  {1, "ALERT_TYPE_PULSE"},
  {0, NULL}
};

static const value_string alert_reasons[] = {
  {1, "ALERT_VERIFY_NO_KEY"},
  {0, NULL}
};
#endif

static void
dissect_negoex_alert_message(tvbuff_t *tvb,
                             packet_info *pinfo _U_,
                             proto_tree *tree,
                             guint32 start_off)
{
  guint32 offset;

  offset = start_off;

  /* AuthScheme */
  proto_tree_add_item(tree, hf_negoex_authscheme, tvb, offset, 16, ENC_LITTLE_ENDIAN);
  offset += 16;

  /* ErrorCode, an NTSTATUS :-) */
  proto_tree_add_item(tree, hf_negoex_errorcode, tvb, offset, 4, ENC_LITTLE_ENDIAN);
  offset += 4;

  /* The rest */
  proto_tree_add_bytes_format(tree, hf_negoex_data, tvb, offset, -1, NULL,
                      "The rest of the alert message");

}

static void
dissect_negoex_verify_message(tvbuff_t *tvb,
                              packet_info *pinfo _U_,
                              proto_tree *tree,
                              guint32 start_off)
{
  guint32 offset;
  guint32 checksum_vector_offset;
  guint32 checksum_vector_count;
  proto_tree *checksum;
  proto_tree *checksum_vector;

  offset = start_off;

  /* AuthScheme */
  proto_tree_add_item(tree, hf_negoex_authscheme, tvb, offset, 16, ENC_LITTLE_ENDIAN);
  offset += 16;

  /* Checksum */
  checksum = proto_tree_add_subtree(tree, tvb, offset, 20, ett_negoex_checksum, NULL, "Checksum");

  /* cbHeaderLength */
  proto_tree_add_item(checksum, hf_negoex_header_len, tvb, offset, 4, ENC_LITTLE_ENDIAN);
  offset += 4;

  /* ChecksumScheme */
  proto_tree_add_item(checksum, hf_negoex_checksum_scheme, tvb, offset, 4, ENC_LITTLE_ENDIAN);
  offset += 4;

  /* ChecksumType */
  proto_tree_add_item(checksum, hf_negoex_checksum_type, tvb, offset, 4, ENC_LITTLE_ENDIAN);
  offset += 4;

  /* Checksum Byte Vector */
  checksum_vector_offset = tvb_get_letohl(tvb, offset);
  checksum_vector_count = tvb_get_letohs(tvb, offset + 4);

  checksum_vector = proto_tree_add_subtree_format(checksum, tvb, offset, 8,
                               ett_negoex_checksum_vector, NULL, "Checksum Vector: %u at %u",
                               checksum_vector_count,
                               checksum_vector_offset);

  proto_tree_add_item(checksum_vector, hf_negoex_checksum_vector_offset, tvb,
                      offset, 4, ENC_LITTLE_ENDIAN);
  offset += 4;

  proto_tree_add_item(checksum_vector, hf_negoex_checksum_vector_count, tvb,
                      offset, 2, ENC_LITTLE_ENDIAN);
  offset += 2;

  proto_tree_add_item(checksum_vector, hf_negoex_checksum_vector_pad, tvb,
                      offset, 2, ENC_NA);
  /*offset += 2;*/

  proto_tree_add_item(checksum_vector, hf_negoex_checksum, tvb,
                      checksum_vector_offset, checksum_vector_count, ENC_NA);

}

static void
dissect_negoex_exchange_message(tvbuff_t *tvb,
                                packet_info *pinfo _U_,
                                proto_tree *tree,
                                guint32 start_off)
{
  guint32 offset;
  guint32 exchange_vector_offset;
  guint32 exchange_vector_count;
  proto_tree *exchange_vector;

  offset = start_off;

  /* AuthScheme */
  proto_tree_add_item(tree, hf_negoex_authscheme, tvb, offset, 16, ENC_LITTLE_ENDIAN);
  offset += 16;

  /* Exchange Byte Vector */
  exchange_vector_offset = tvb_get_letohl(tvb, offset);
  exchange_vector_count = tvb_get_letohs(tvb, offset + 4);

  exchange_vector = proto_tree_add_subtree_format(tree, tvb, offset, 8,
                           ett_negoex_exchange, NULL, "Exchange: %u bytes at %u",
                           exchange_vector_count, exchange_vector_offset);

  proto_tree_add_item(exchange_vector, hf_negoex_exchange_vector_offset, tvb,
                      offset, 4, ENC_LITTLE_ENDIAN);
  offset += 4;

  proto_tree_add_item(exchange_vector, hf_negoex_exchange_vector_count, tvb,
                      offset, 2, ENC_LITTLE_ENDIAN);
  offset += 2;

  proto_tree_add_item(exchange_vector, hf_negoex_exchange_vector_pad, tvb,
                      offset, 2, ENC_NA);
  /*offset += 2;*/

  proto_tree_add_item(exchange_vector, hf_negoex_exchange, tvb,
                      exchange_vector_offset, exchange_vector_count, ENC_NA);
}

/*
 * In each of the subdissectors we are handed the whole message, but the
 * header is already dissected. The offset tells us where in the buffer the
 * actual data starts. This is a bit redundant, but it allows for changes
 * to the header structure ...
 *
 * Eventually we want to treat the header and body differently perhaps.
 */
static void
dissect_negoex_nego_message(tvbuff_t *tvb,
                            packet_info *pinfo _U_,
                            proto_tree *tree,
                            guint32 start_off)
{
  volatile guint32 offset;
  guint32 authscheme_vector_offset;
  guint16 authscheme_vector_count;
  guint32 extension_vector_offset;
  guint32 extension_vector_count;
  proto_tree *authscheme_vector;
  proto_tree *extension_vector;
  guint32 i;

  offset = start_off;

  TRY {
    /* The Random field */
    proto_tree_add_item(tree, hf_negoex_random, tvb, offset, 32, ENC_ASCII);
    offset += 32;

    /* Protocol version */
    proto_tree_add_item(tree, hf_negoex_proto_version, tvb, offset, 8, ENC_LITTLE_ENDIAN);
    offset += 8;

    /* AuthScheme offset and count */
    authscheme_vector_offset = tvb_get_letohl(tvb, offset);
    authscheme_vector_count = tvb_get_letohs(tvb, offset + 4);

    authscheme_vector = proto_tree_add_subtree_format(tree, tvb, offset, 8,
                             ett_negoex_authscheme_vector, NULL, "AuthSchemes: %u at %u",
                             authscheme_vector_count, authscheme_vector_offset);
    proto_tree_add_item(authscheme_vector, hf_negoex_authscheme_vector_offset,
                        tvb, offset, 4, ENC_LITTLE_ENDIAN);
    offset += 4;

    proto_tree_add_item(authscheme_vector, hf_negoex_authscheme_vector_count,
                        tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    proto_tree_add_item(authscheme_vector, hf_negoex_authscheme_vector_pad,
                        tvb, offset, 2, ENC_NA);
    offset += 2;

    /* Now, add the various items */
    for (i = 0; i < authscheme_vector_count; i++) {
      proto_tree_add_item(authscheme_vector, hf_negoex_authscheme, tvb,
                          authscheme_vector_offset + i * 16, 16, ENC_LITTLE_ENDIAN);
    }

    extension_vector_offset = tvb_get_letohl(tvb, offset);
    extension_vector_count = tvb_get_letohs(tvb, offset + 4);

    extension_vector = proto_tree_add_subtree_format(tree, tvb, offset, 8,
                                 ett_negoex_extension_vector, NULL, "Extensions: %u at %u",
                                 extension_vector_count, extension_vector_count);

    proto_tree_add_item(extension_vector, hf_negoex_extension_vector_offset,
                        tvb, offset, 4, ENC_LITTLE_ENDIAN);
    offset += 4;

    proto_tree_add_item(extension_vector, hf_negoex_extension_vector_count,
                        tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    proto_tree_add_item(extension_vector, hf_negoex_extension_vector_pad,
                        tvb, offset, 2, ENC_NA);
    offset += 2;

    for (i = 0; i < extension_vector_count; i++) {
      guint32 byte_vector_offset, byte_vector_count;
      proto_tree *bv_tree;

      /*
       * Dissect these things ... they consist of a byte vector, so we
       * add a subtree and point to the relevant bytes
       */
      byte_vector_offset = tvb_get_letohl(tvb, offset);
      byte_vector_count = tvb_get_letohs(tvb, offset + 4);

      bv_tree = proto_tree_add_subtree_format(extension_vector, tvb,
                                  extension_vector_offset + i * 8, 8,
                                  ett_negoex_byte_vector, NULL, "Extension: %u bytes at %u",
                                  byte_vector_count, byte_vector_offset);

      proto_tree_add_item(bv_tree, hf_negoex_extension, tvb,
                          byte_vector_offset, byte_vector_count, ENC_NA);
    }


  } ENDTRY;

}

static int
dissect_negoex(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
  volatile guint32 offset;
  proto_tree * volatile negoex_tree;
  proto_item *tf;
  volatile gboolean done;
  guint32 payload_len;
  guint32 message_len;
  guint32 message_type;
  guint32 header_len;

  offset = 0;
  negoex_tree = NULL;
  tf = NULL;
  done = FALSE;
  payload_len = tvb_reported_length(tvb);

  /* Set up the initial NEGOEX payload */
  if (tree) {
    tf = proto_tree_add_item(tree, proto_negoex, tvb, offset, -1, ENC_NA);
    negoex_tree = proto_item_add_subtree(tf, ett_negoex);
  }

  /*
   * There can be multiple negoex messages, each with a header with a length.
   * However, the payload might not have been reassembled ...
   */

  while (offset < payload_len && !done) {
    proto_tree *negoex_msg_tree;
    proto_tree *negoex_hdr_tree;
    proto_item *msg;
    tvbuff_t *msg_tvb;
    guint32 start_offset;

    start_offset = offset;

    TRY {
     /* Message type, it is after the signature */
      message_type = tvb_get_letohl(tvb, offset + 8);

      /* Add the message type tree ... set its length below */
      negoex_msg_tree = proto_tree_add_subtree_format(negoex_tree, tvb, offset, -1,
                                ett_negoex_msg, &msg, "NEGOEX %s",
                                val_to_str_const(message_type,
                                                 negoex_message_types,
                                                 "Unknown NEGOEX message type"));

      /* Add a subtree for the header */
      negoex_hdr_tree = proto_tree_add_subtree(negoex_msg_tree, tvb, offset, 40, ett_negoex_hdr, NULL, "Header");

      /* Signature, NEGOEXTS */
      proto_tree_add_item(negoex_hdr_tree, hf_negoex_sig,
                          tvb, offset, 8, ENC_ASCII | ENC_NA);
      offset += 8;

      col_append_sep_str(pinfo->cinfo, COL_INFO, ", ",
                          val_to_str_const(message_type,
                                           negoex_message_types,
                                           "Unknown NEGOEX message type"));
      proto_tree_add_uint(negoex_hdr_tree, hf_negoex_message_type,
                          tvb, offset, 4, message_type);

      /*
       * If this is an unknown message type, we have to punt because anything
       * following cannot be handled
       */
      if (message_type > MESSAGE_TYPE_MAX_MSG) {
        offset = payload_len; /* Can't do any more */
        goto bad_message;
      } else {
        offset += 4;
      }

      /* Sequence Number */
      proto_tree_add_item(negoex_hdr_tree, hf_negoex_sequence_num,
                          tvb, offset, 4, ENC_LITTLE_ENDIAN);
      offset += 4;

      /* Header Length */
      header_len = tvb_get_letohl(tvb, offset);
      proto_tree_add_uint(negoex_hdr_tree, hf_negoex_header_len,
                          tvb, offset, 4, header_len);
      offset += 4;

      /* Message Length */
      message_len = tvb_get_letohl(tvb, offset);
      proto_tree_add_uint(negoex_hdr_tree, hf_negoex_message_len,
                          tvb, offset, 4, message_len);
      offset += 4;

      /* Set the message len so the tree item has correct len */
      proto_item_set_len(msg, message_len);

      /* Conversation ID */
      proto_tree_add_item(negoex_hdr_tree, hf_negoex_conversation_id,
                          tvb, offset, 16, ENC_LITTLE_ENDIAN);
      offset += 16;

      /*
       * Construct a new TVB covering just this message and pass to the
       * sub-dissector
       */
      msg_tvb = tvb_new_subset_length_caplen(tvb,
                               start_offset,
                               MIN(message_len, tvb_captured_length(tvb)),
                               message_len);

      switch (message_type) {
      case MESSAGE_TYPE_INITIATOR_NEGO:
      case MESSAGE_TYPE_ACCEPTOR_NEGO:
        dissect_negoex_nego_message(msg_tvb,
                                    pinfo,
                                    negoex_msg_tree,
                                    offset - start_offset);
        break;

      case MESSAGE_TYPE_INITIATOR_META_DATA:
      case MESSAGE_TYPE_ACCEPTOR_META_DATA:
      case MESSAGE_TYPE_CHALLENGE:
      case MESSAGE_TYPE_AP_REQUEST:
        dissect_negoex_exchange_message(msg_tvb,
                                        pinfo,
                                        negoex_msg_tree,
                                        offset - start_offset);
        break;

      case MESSAGE_TYPE_VERIFY:
        dissect_negoex_verify_message(msg_tvb,
                                      pinfo,
                                      negoex_msg_tree,
                                      offset - start_offset);
        break;

      case MESSAGE_TYPE_ALERT:
        dissect_negoex_alert_message(msg_tvb,
                                     pinfo,
                                     negoex_msg_tree,
                                     offset - start_offset);
        break;

      default:
        proto_tree_add_bytes_format(negoex_msg_tree, hf_negoex_data, tvb, offset, message_len - 40, NULL,
                            "The rest of the message");
      }

      offset = start_offset + message_len;

      /* We cannot branch out of the TRY block, but we can branch here */
    bad_message:
        ;

    } CATCH_NONFATAL_ERRORS {
      done = TRUE;
      show_exception(tvb, pinfo, tree, EXCEPT_CODE, GET_MESSAGE);
    } ENDTRY;
  }

  return tvb_captured_length(tvb);
}

void
proto_register_negoex(void)
{

  static hf_register_info hf[] = {
    { &hf_negoex_sig,
      { "Signature", "negoex.message.sig", FT_STRING, BASE_NONE,
        NULL, 0x0, NULL, HFILL }},
    { &hf_negoex_message_type,
      { "MessageType", "negoex.message.type", FT_UINT32, BASE_HEX,
         VALS(negoex_message_types), 0x00, NULL, HFILL }},
    { &hf_negoex_sequence_num,
      { "SequencNum", "negoex.message.seq_num", FT_UINT32, BASE_DEC,
        NULL, 0x0, NULL, HFILL }},
    { &hf_negoex_header_len,
      { "cbHeaderLength", "negoex.header.len", FT_UINT32, BASE_DEC,
        NULL, 0x0, NULL, HFILL }},
    { &hf_negoex_message_len,
      { "cbMessageLength", "negoex.message.len", FT_UINT32, BASE_DEC,
        NULL, 0x0, NULL, HFILL }},
    { &hf_negoex_conversation_id,
      { "ConversationID", "negoex.message.conv_id", FT_GUID, BASE_NONE,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_random,
      { "Random", "negoex.message.random", FT_BYTES, BASE_NONE,
        NULL, 0x0, "Random data", HFILL }},
    { &hf_negoex_proto_version,
      { "ProtocolVersion", "negoex.proto_version", FT_UINT64, BASE_DEC,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_authscheme,
      { "AuthScheme", "negoex.auth_scheme", FT_GUID, BASE_NONE,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_authscheme_vector_offset,
      { "AuthSchemeArrayOffset", "negoex.auth_scheme_array_offset", FT_UINT32,
        BASE_DEC, NULL, 0x0, NULL, HFILL }},
    { &hf_negoex_authscheme_vector_count,
      { "AuthSchemeCount", "negoex.auth_scheme_array_count", FT_UINT16,
        BASE_DEC, NULL, 0x0, NULL, HFILL }},
    { &hf_negoex_authscheme_vector_pad,
      { "AuthSchemePad", "negoex.auth_scheme_array_pad", FT_BYTES,
        BASE_NONE, NULL, 0x0, NULL, HFILL }},
    { &hf_negoex_extension,
      { "Extension", "negoex.extension", FT_BYTES, BASE_NONE,
        NULL, 0x0, "Extension data", HFILL }},
    { &hf_negoex_extension_vector_offset,
      { "ExtensionArrayOffset", "negoex.extension_array_offset", FT_UINT32,
        BASE_DEC, NULL, 0x0, NULL, HFILL }},
    { &hf_negoex_extension_vector_count,
      { "ExtensionCount", "negoex.extension_array_count", FT_UINT16,
        BASE_DEC, NULL, 0x0, NULL, HFILL }},
    { &hf_negoex_extension_vector_pad,
      { "ExtensionPad", "negoex.extension_pad", FT_BYTES,
        BASE_NONE, NULL, 0x0, NULL, HFILL }},
    { &hf_negoex_exchange_vector_offset,
      { "ExchangeOffset", "negoex.exchange_vec_offset", FT_UINT32, BASE_DEC,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_exchange_vector_count,
      { "ExchangeByteCount", "negoex.exchange_vec_byte_count", FT_UINT16,
        BASE_DEC, NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_exchange_vector_pad,
      { "ExchangePad", "negoex.exchange_vec_pad", FT_BYTES, BASE_NONE,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_exchange,
      { "Exchange Bytes", "negoex.exchange", FT_BYTES, BASE_NONE,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_checksum_scheme,
      { "ChecksumScheme", "negoex.checksum_scheme", FT_UINT32, BASE_DEC,
        VALS(checksum_schemes), 0x0, NULL, HFILL}},
    { &hf_negoex_checksum_vector_offset,
      { "ChecksumOffset", "negoex.checksum_vec_offset", FT_UINT32, BASE_DEC,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_checksum_vector_count,
      { "ChecksumCount", "negoex.checksum_vec_count", FT_UINT16, BASE_DEC,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_checksum_vector_pad,
      { "ChecksumPad", "negoex.checksum_pad", FT_BYTES, BASE_NONE,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_checksum_type,
      { "ChecksumType", "negoex.checksum_type", FT_UINT32, BASE_DEC,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_checksum,
      { "Checksum", "negoex.checksum", FT_BYTES, BASE_NONE,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_errorcode,
      { "ErrorCode", "negoex.errorcode", FT_UINT32, BASE_HEX,
        NULL, 0x0, NULL, HFILL}},
    { &hf_negoex_data,
      { "Data", "negoex.data", FT_BYTES, BASE_NONE,
        NULL, 0x0, NULL, HFILL}},
  };

  static gint *ett[] = {
    &ett_negoex,
    &ett_negoex_msg,
    &ett_negoex_hdr,
    &ett_negoex_authscheme_vector,
    &ett_negoex_extension_vector,
    &ett_negoex_exchange,
    &ett_negoex_checksum,
    &ett_negoex_checksum_vector,
    &ett_negoex_byte_vector,
  };
  /*module_t *negoex_module = NULL; */

  proto_negoex = proto_register_protocol (
    "SPNEGO Extended Negotiation Security Mechanism", /* name */
    "NEGOEX",  /* short name */
    "negoex"   /* abbrev */
    );
  proto_register_field_array(proto_negoex, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));

  /* negoex_module = prefs_register_protocol(proto_negoex, NULL);*/

  negoex_handle = register_dissector("negoex", dissect_negoex, proto_negoex);
}

void
proto_reg_handoff_negoex(void)
{

  /* Register protocol with the GSS-API module */
  gssapi_init_oid("1.3.6.1.4.1.311.2.2.30", proto_negoex, ett_negoex,
                  negoex_handle, NULL,
                  "NEGOEX - SPNEGO Extended Negotiation Security Mechanism");

}

/*
 * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 2
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=2 tabstop=8 expandtab:
 * :indentSize=2:tabSize=8:noTabs=true:
 */