summaryrefslogtreecommitdiff
path: root/source4/auth/gensec/spnego.c
blob: e51b215807973b87a4e669dc9b8e69ebf1a6a247 (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
/* 
   Unix SMB/CIFS implementation.

   RFC2478 Compliant SPNEGO implementation
   
   Copyright (C) Jim McDonough <jmcd@us.ibm.com>      2003
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   Copyright (C) Stefan Metzmacher <metze@samba.org>  2004-2008

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "auth/gensec/spnego.h"
#include "librpc/gen_ndr/ndr_dcerpc.h"
#include "auth/credentials/credentials.h"
#include "auth/gensec/gensec.h"
#include "auth/gensec/gensec_proto.h"

enum spnego_state_position {
	SPNEGO_SERVER_START,
	SPNEGO_CLIENT_START,
	SPNEGO_SERVER_TARG,
	SPNEGO_CLIENT_TARG,
	SPNEGO_FALLBACK,
	SPNEGO_DONE
};

struct spnego_state {
	enum spnego_message_type expected_packet;
	enum spnego_state_position state_position;
	struct gensec_security *sub_sec_security;
	bool no_response_expected;

	const char *neg_oid;

	DATA_BLOB mech_types;
};


static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
{
	struct spnego_state *spnego_state;

	spnego_state = talloc(gensec_security, struct spnego_state);
	if (!spnego_state) {
		return NT_STATUS_NO_MEMORY;
	}

	spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
	spnego_state->state_position = SPNEGO_CLIENT_START;
	spnego_state->sub_sec_security = NULL;
	spnego_state->no_response_expected = false;
	spnego_state->mech_types = data_blob(NULL, 0);

	gensec_security->private_data = spnego_state;
	return NT_STATUS_OK;
}

static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
{
	struct spnego_state *spnego_state;

	spnego_state = talloc(gensec_security, struct spnego_state);		
	if (!spnego_state) {
		return NT_STATUS_NO_MEMORY;
	}

	spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
	spnego_state->state_position = SPNEGO_SERVER_START;
	spnego_state->sub_sec_security = NULL;
	spnego_state->no_response_expected = false;
	spnego_state->mech_types = data_blob(NULL, 0);

	gensec_security->private_data = spnego_state;
	return NT_STATUS_OK;
}

/*
  wrappers for the spnego_*() functions
*/
static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security, 
					    TALLOC_CTX *mem_ctx, 
					    uint8_t *data, size_t length, 
					    const uint8_t *whole_pdu, size_t pdu_length, 
					    const DATA_BLOB *sig)
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_unseal_packet(spnego_state->sub_sec_security, 
				    mem_ctx, 
				    data, length, 
				    whole_pdu, pdu_length,
				    sig); 
}

static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security, 
					   TALLOC_CTX *mem_ctx, 
					   const uint8_t *data, size_t length, 
					   const uint8_t *whole_pdu, size_t pdu_length, 
					   const DATA_BLOB *sig)
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_check_packet(spnego_state->sub_sec_security, 
				   mem_ctx, 
				   data, length, 
				   whole_pdu, pdu_length,
				   sig);
}

static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security, 
					  TALLOC_CTX *mem_ctx, 
					  uint8_t *data, size_t length, 
					  const uint8_t *whole_pdu, size_t pdu_length, 
					  DATA_BLOB *sig)
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_seal_packet(spnego_state->sub_sec_security, 
				  mem_ctx, 
				  data, length, 
				  whole_pdu, pdu_length,
				  sig);
}

static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security, 
					  TALLOC_CTX *mem_ctx, 
					  const uint8_t *data, size_t length, 
					  const uint8_t *whole_pdu, size_t pdu_length, 
					  DATA_BLOB *sig)
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_sign_packet(spnego_state->sub_sec_security, 
				  mem_ctx, 
				  data, length, 
				  whole_pdu, pdu_length,
				  sig);
}

static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security, 
				   TALLOC_CTX *mem_ctx, 
				   const DATA_BLOB *in, 
				   DATA_BLOB *out)
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_wrap(spnego_state->sub_sec_security, 
			   mem_ctx, in, out);
}

static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security, 
				     TALLOC_CTX *mem_ctx, 
				     const DATA_BLOB *in, 
				     DATA_BLOB *out)
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_unwrap(spnego_state->sub_sec_security, 
			     mem_ctx, in, out);
}

static NTSTATUS gensec_spnego_wrap_packets(struct gensec_security *gensec_security, 
					   TALLOC_CTX *mem_ctx, 
					   const DATA_BLOB *in, 
					   DATA_BLOB *out,
					   size_t *len_processed) 
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_wrap_packets(spnego_state->sub_sec_security, 
				   mem_ctx, in, out,
				   len_processed);
}

static NTSTATUS gensec_spnego_packet_full_request(struct gensec_security *gensec_security, 
					     	DATA_BLOB blob, size_t *size)
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_packet_full_request(spnego_state->sub_sec_security, 
					  blob, size);
}

static NTSTATUS gensec_spnego_unwrap_packets(struct gensec_security *gensec_security, 
					     TALLOC_CTX *mem_ctx, 
					     const DATA_BLOB *in, 
					     DATA_BLOB *out,
					     size_t *len_processed) 
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_unwrap_packets(spnego_state->sub_sec_security, 
				     mem_ctx, in, out,
				     len_processed);
}

static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security, size_t data_size) 
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		return 0;
	}
	
	return gensec_sig_size(spnego_state->sub_sec_security, data_size);
}

static size_t gensec_spnego_max_input_size(struct gensec_security *gensec_security) 
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		return 0;
	}
	
	return gensec_max_input_size(spnego_state->sub_sec_security);
}

static size_t gensec_spnego_max_wrapped_size(struct gensec_security *gensec_security) 
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (spnego_state->state_position != SPNEGO_DONE 
	    && spnego_state->state_position != SPNEGO_FALLBACK) {
		return 0;
	}
	
	return gensec_max_wrapped_size(spnego_state->sub_sec_security);
}

static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security, 
					  DATA_BLOB *session_key)
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
	if (!spnego_state->sub_sec_security) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_session_key(spnego_state->sub_sec_security, 
				  session_key);
}

static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
								      struct auth_session_info **session_info) 
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
	if (!spnego_state->sub_sec_security) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_session_info(spnego_state->sub_sec_security, 
				   session_info);
}

/** Fallback to another GENSEC mechanism, based on magic strings 
 *
 * This is the 'fallback' case, where we don't get SPNEGO, and have to
 * try all the other options (and hope they all have a magic string
 * they check)
*/

static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security, 
						  struct spnego_state *spnego_state,
						  TALLOC_CTX *out_mem_ctx, 
						  const DATA_BLOB in, DATA_BLOB *out) 
{
	int i,j;
	struct gensec_security_ops **all_ops
		= gensec_security_mechs(gensec_security, out_mem_ctx);
	for (i=0; all_ops[i]; i++) {
		bool is_spnego;
		NTSTATUS nt_status;

	    	if (gensec_security != NULL && 
				!gensec_security_ops_enabled(all_ops[i], gensec_security->settings->lp_ctx))
		    continue;

		if (!all_ops[i]->oid) {
			continue;
		}

		is_spnego = false;
		for (j=0; all_ops[i]->oid[j]; j++) {
			if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
				is_spnego = true;
			}
		}
		if (is_spnego) {
			continue;
		}

		if (!all_ops[i]->magic) {
			continue;
		}

		nt_status = all_ops[i]->magic(gensec_security, &in);
		if (!NT_STATUS_IS_OK(nt_status)) {
			continue;
		}

		spnego_state->state_position = SPNEGO_FALLBACK;

		nt_status = gensec_subcontext_start(spnego_state, 
						    gensec_security, 
						    &spnego_state->sub_sec_security);

		if (!NT_STATUS_IS_OK(nt_status)) {
			return nt_status;
		}
		/* select the sub context */
		nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
						     all_ops[i]);
		if (!NT_STATUS_IS_OK(nt_status)) {
			return nt_status;
		}
		nt_status = gensec_update(spnego_state->sub_sec_security,
					  out_mem_ctx, in, out);
		return nt_status;
	}
	DEBUG(1, ("Failed to parse SPNEGO request\n"));
	return NT_STATUS_INVALID_PARAMETER;
	
}

/* 
   Parse the netTokenInit, either from the client, to the server, or
   from the server to the client.
*/

static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
						 struct spnego_state *spnego_state, 
						 TALLOC_CTX *out_mem_ctx, 
						 const char **mechType,
						 const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out) 
{
	int i;
	NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
	DATA_BLOB null_data_blob = data_blob(NULL,0);
	bool ok;

	const struct gensec_security_ops_wrapper *all_sec
		= gensec_security_by_oid_list(gensec_security, 
					      out_mem_ctx, 
					      mechType,
					      GENSEC_OID_SPNEGO);

	ok = spnego_write_mech_types(spnego_state,
				     mechType,
				     &spnego_state->mech_types);
	if (!ok) {
		DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
		return NT_STATUS_NO_MEMORY;
	}

	if (spnego_state->state_position == SPNEGO_SERVER_START) {
		for (i=0; all_sec && all_sec[i].op; i++) {
			/* optomisitic token */
			if (strcmp(all_sec[i].oid, mechType[0]) == 0) {
				nt_status = gensec_subcontext_start(spnego_state,
								    gensec_security,
								    &spnego_state->sub_sec_security);
				if (!NT_STATUS_IS_OK(nt_status)) {
					return nt_status;
				}
				/* select the sub context */
				nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
								     all_sec[i].op);
				if (!NT_STATUS_IS_OK(nt_status)) {
					talloc_free(spnego_state->sub_sec_security);
					spnego_state->sub_sec_security = NULL;
					break;
				}
				
				nt_status = gensec_update(spnego_state->sub_sec_security,
							  out_mem_ctx, 
							  unwrapped_in,
							  unwrapped_out);
				if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) || 
				    NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
					/* Pretend we never started it (lets the first run find some incompatible demand) */
					
					DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n", 
						  spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
					talloc_free(spnego_state->sub_sec_security);
					spnego_state->sub_sec_security = NULL;
					break;
				}

				spnego_state->neg_oid = all_sec[i].oid;
				break;
			}
		}
	}
	
	/* Having tried any optomisitc token from the client (if we
	 * were the server), if we didn't get anywhere, walk our list
	 * in our preference order */
	
	if (!spnego_state->sub_sec_security) {
		for (i=0; all_sec && all_sec[i].op; i++) {
			nt_status = gensec_subcontext_start(spnego_state,
							    gensec_security,
							    &spnego_state->sub_sec_security);
			if (!NT_STATUS_IS_OK(nt_status)) {
				return nt_status;
			}
			/* select the sub context */
			nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
							     all_sec[i].op);
			if (!NT_STATUS_IS_OK(nt_status)) {
				talloc_free(spnego_state->sub_sec_security);
				spnego_state->sub_sec_security = NULL;
				continue;
			}
			
			spnego_state->neg_oid = all_sec[i].oid;

			/* only get the helping start blob for the first OID */
			nt_status = gensec_update(spnego_state->sub_sec_security,
						  out_mem_ctx, 
						  null_data_blob, 
						  unwrapped_out);

			/* it is likely that a NULL input token will
			 * not be liked by most server mechs, but if
			 * we are in the client, we want the first
			 * update packet to be able to abort the use
			 * of this mech */
			if (spnego_state->state_position != SPNEGO_SERVER_START) {
				if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) || 
				    NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
					/* Pretend we never started it (lets the first run find some incompatible demand) */
					
					DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse: %s\n", 
						  spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
					talloc_free(spnego_state->sub_sec_security);
					spnego_state->sub_sec_security = NULL;
					continue;
				}
			}

			break;
		}
	}

	if (spnego_state->sub_sec_security) {
		/* it is likely that a NULL input token will
		 * not be liked by most server mechs, but this
		 * does the right thing in the CIFS client.
		 * just push us along the merry-go-round
		 * again, and hope for better luck next
		 * time */
		
		if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
			*unwrapped_out = data_blob(NULL, 0);
			nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
		}
		
		if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) 
		    && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) 
		    && !NT_STATUS_IS_OK(nt_status)) {
			DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n", 
				  spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
			talloc_free(spnego_state->sub_sec_security);
			spnego_state->sub_sec_security = NULL;
			
			/* We started the mech correctly, and the
			 * input from the other side was valid.
			 * Return the error (say bad password, invalid
			 * ticket) */
			return nt_status;
		}
	
		
		return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
	}

	DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
	/* we could re-negotiate here, but it would only work
	 * if the client or server lied about what it could
	 * support the first time.  Lets keep this code to
	 * reality */

	return nt_status;
}

/** create a negTokenInit 
 *
 * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
*/
static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security, 
						  struct spnego_state *spnego_state,
						  TALLOC_CTX *out_mem_ctx, 
						  const DATA_BLOB in, DATA_BLOB *out) 
{
	int i;
	NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
	DATA_BLOB null_data_blob = data_blob(NULL,0);
	const char **mechTypes = NULL;
	DATA_BLOB unwrapped_out = data_blob(NULL, 0);
	const struct gensec_security_ops_wrapper *all_sec;
	const char *principal = NULL;

	mechTypes = gensec_security_oids(gensec_security, 
					 out_mem_ctx, GENSEC_OID_SPNEGO);

	all_sec	= gensec_security_by_oid_list(gensec_security, 
					      out_mem_ctx, 
					      mechTypes,
					      GENSEC_OID_SPNEGO);
	for (i=0; all_sec && all_sec[i].op; i++) {
		struct spnego_data spnego_out;
		const char **send_mech_types;
		bool ok;

		nt_status = gensec_subcontext_start(spnego_state,
						    gensec_security,
						    &spnego_state->sub_sec_security);
		if (!NT_STATUS_IS_OK(nt_status)) {
			return nt_status;
		}
		/* select the sub context */
		nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
						     all_sec[i].op);
		if (!NT_STATUS_IS_OK(nt_status)) {
			talloc_free(spnego_state->sub_sec_security);
			spnego_state->sub_sec_security = NULL;
			continue;
		}

		/* In the client, try and produce the first (optimistic) packet */
		if (spnego_state->state_position == SPNEGO_CLIENT_START) {
			nt_status = gensec_update(spnego_state->sub_sec_security,
						  out_mem_ctx, 
						  null_data_blob,
						  &unwrapped_out);
			
			if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) 
			    && !NT_STATUS_IS_OK(nt_status)) {
				DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n", 
					  spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
				talloc_free(spnego_state->sub_sec_security);
				spnego_state->sub_sec_security = NULL;
				/* Pretend we never started it (lets the first run find some incompatible demand) */
				
				continue;
			}
		}

		spnego_out.type = SPNEGO_NEG_TOKEN_INIT;

		send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
									&all_sec[i]);

		ok = spnego_write_mech_types(spnego_state,
					     send_mech_types,
					     &spnego_state->mech_types);
		if (!ok) {
			DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
			return NT_STATUS_NO_MEMORY;
		}

		/* List the remaining mechs as options */
		spnego_out.negTokenInit.mechTypes = send_mech_types;
		spnego_out.negTokenInit.reqFlags = 0;
		
		if (spnego_state->state_position == SPNEGO_SERVER_START) {
			/* server credentials */
			struct cli_credentials *creds = gensec_get_credentials(gensec_security);
			if (creds) {
				principal = cli_credentials_get_principal(creds, out_mem_ctx);
			}
		}
		if (principal) {
			spnego_out.negTokenInit.mechListMIC
				= data_blob_string_const(principal);
		} else {
			spnego_out.negTokenInit.mechListMIC = null_data_blob;
		}

		spnego_out.negTokenInit.mechToken = unwrapped_out;
		
		if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
			DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
				return NT_STATUS_INVALID_PARAMETER;
		}
		
		/* set next state */
		spnego_state->neg_oid = all_sec[i].oid;
		
		if (NT_STATUS_IS_OK(nt_status)) {
			spnego_state->no_response_expected = true;
		}

		return NT_STATUS_MORE_PROCESSING_REQUIRED;
	} 
	talloc_free(spnego_state->sub_sec_security);
	spnego_state->sub_sec_security = NULL;

	DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
	return NT_STATUS_INVALID_PARAMETER;
}


/** create a server negTokenTarg 
 *
 * This is the case, where the client is the first one who sends data
*/

static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security, 
						  struct spnego_state *spnego_state,
						  TALLOC_CTX *out_mem_ctx, 
						  NTSTATUS nt_status,
						  const DATA_BLOB unwrapped_out,
						  DATA_BLOB mech_list_mic,
						  DATA_BLOB *out)
{
	struct spnego_data spnego_out;
	DATA_BLOB null_data_blob = data_blob(NULL, 0);

	/* compose reply */
	spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
	spnego_out.negTokenTarg.responseToken = unwrapped_out;
	spnego_out.negTokenTarg.mechListMIC = null_data_blob;
	spnego_out.negTokenTarg.supportedMech = NULL;

	if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {	
		spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
		spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
		spnego_state->state_position = SPNEGO_SERVER_TARG;
	} else if (NT_STATUS_IS_OK(nt_status)) {
		if (unwrapped_out.data) {
			spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
		}
		spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
		spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
		spnego_state->state_position = SPNEGO_DONE;
	} else {
		spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
		DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
		spnego_state->state_position = SPNEGO_DONE;
	}

	if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
		DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}

	spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;

	return nt_status;
}


static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx, 
				     const DATA_BLOB in, DATA_BLOB *out) 
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
	DATA_BLOB null_data_blob = data_blob(NULL, 0);
	DATA_BLOB mech_list_mic = data_blob(NULL, 0);
	DATA_BLOB unwrapped_out = data_blob(NULL, 0);
	struct spnego_data spnego_out;
	struct spnego_data spnego;

	ssize_t len;

	*out = data_blob(NULL, 0);

	if (!out_mem_ctx) {
		out_mem_ctx = spnego_state;
	}

	/* and switch into the state machine */

	switch (spnego_state->state_position) {
	case SPNEGO_FALLBACK:
		return gensec_update(spnego_state->sub_sec_security,
				     out_mem_ctx, in, out);
	case SPNEGO_SERVER_START:
	{
		NTSTATUS nt_status;
		if (in.length) {

			len = spnego_read_data(gensec_security, in, &spnego);
			if (len == -1) {
				return gensec_spnego_server_try_fallback(gensec_security, spnego_state, 
									 out_mem_ctx, in, out);
			}
			/* client sent NegTargetInit, we send NegTokenTarg */

			/* OK, so it's real SPNEGO, check the packet's the one we expect */
			if (spnego.type != spnego_state->expected_packet) {
				DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type, 
					  spnego_state->expected_packet));
				dump_data(1, in.data, in.length);
				spnego_free_data(&spnego);
				return NT_STATUS_INVALID_PARAMETER;
			}
			
			nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
								     spnego_state,
								     out_mem_ctx, 
								     spnego.negTokenInit.mechTypes,
								     spnego.negTokenInit.mechToken, 
								     &unwrapped_out);
			
			nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
								      spnego_state,
								      out_mem_ctx,
								      nt_status,
								      unwrapped_out,
								      null_data_blob,
								      out);
			
			spnego_free_data(&spnego);
			
			return nt_status;
		} else {
			nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state, 
								      out_mem_ctx, in, out);
			spnego_state->state_position = SPNEGO_SERVER_START;
			spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
			return nt_status;
		}
	}
	
	case SPNEGO_CLIENT_START:
	{
		/* The server offers a list of mechanisms */
		
		const char *my_mechs[] = {NULL, NULL};
		NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;

		if (!in.length) {
			/* client to produce negTokenInit */
			nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state, 
								 out_mem_ctx, in, out);
			spnego_state->state_position = SPNEGO_CLIENT_TARG;
			spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
			return nt_status;
		}
		
		len = spnego_read_data(gensec_security, in, &spnego);
		
		if (len == -1) {
			DEBUG(1, ("Invalid SPNEGO request:\n"));
			dump_data(1, in.data, in.length);
			return NT_STATUS_INVALID_PARAMETER;
		}
		
		/* OK, so it's real SPNEGO, check the packet's the one we expect */
		if (spnego.type != spnego_state->expected_packet) {
			DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type, 
				  spnego_state->expected_packet));
			dump_data(1, in.data, in.length);
			spnego_free_data(&spnego);
			return NT_STATUS_INVALID_PARAMETER;
		}

		if (spnego.negTokenInit.targetPrincipal) {
			DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
			gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
		}

		nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
							     spnego_state,
							     out_mem_ctx, 
							     spnego.negTokenInit.mechTypes,
							     spnego.negTokenInit.mechToken, 
							     &unwrapped_out);

		if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
			spnego_free_data(&spnego);
			return nt_status;
		}

		my_mechs[0] = spnego_state->neg_oid;
		/* compose reply */
		spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
		spnego_out.negTokenInit.mechTypes = my_mechs;
		spnego_out.negTokenInit.reqFlags = 0;
		spnego_out.negTokenInit.mechListMIC = null_data_blob;
		spnego_out.negTokenInit.mechToken = unwrapped_out;
		
		if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
			DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
				return NT_STATUS_INVALID_PARAMETER;
		}
		
		/* set next state */
		spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
		spnego_state->state_position = SPNEGO_CLIENT_TARG;

		if (NT_STATUS_IS_OK(nt_status)) {
			spnego_state->no_response_expected = true;
		}
		
		spnego_free_data(&spnego);
		return NT_STATUS_MORE_PROCESSING_REQUIRED;
	}
	case SPNEGO_SERVER_TARG:
	{
		NTSTATUS nt_status;
		bool new_spnego = false;

		if (!in.length) {
			return NT_STATUS_INVALID_PARAMETER;
		}
		
		len = spnego_read_data(gensec_security, in, &spnego);
		
		if (len == -1) {
			DEBUG(1, ("Invalid SPNEGO request:\n"));
			dump_data(1, in.data, in.length);
			return NT_STATUS_INVALID_PARAMETER;
		}
		
		/* OK, so it's real SPNEGO, check the packet's the one we expect */
		if (spnego.type != spnego_state->expected_packet) {
			DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type, 
				  spnego_state->expected_packet));
			dump_data(1, in.data, in.length);
			spnego_free_data(&spnego);
			return NT_STATUS_INVALID_PARAMETER;
		}

		if (!spnego_state->sub_sec_security) {
			DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
			spnego_free_data(&spnego);
			return NT_STATUS_INVALID_PARAMETER;
		}

		nt_status = gensec_update(spnego_state->sub_sec_security,
					  out_mem_ctx, 
					  spnego.negTokenTarg.responseToken,
					  &unwrapped_out);
		if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
			new_spnego = true;
			nt_status = gensec_check_packet(spnego_state->sub_sec_security,
							out_mem_ctx,
							spnego_state->mech_types.data,
							spnego_state->mech_types.length,
							spnego_state->mech_types.data,
							spnego_state->mech_types.length,
							&spnego.negTokenTarg.mechListMIC);
			if (!NT_STATUS_IS_OK(nt_status)) {
				DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
					nt_errstr(nt_status)));
			}
		}
		if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
			nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
						       out_mem_ctx,
						       spnego_state->mech_types.data,
						       spnego_state->mech_types.length,
						       spnego_state->mech_types.data,
						       spnego_state->mech_types.length,
						       &mech_list_mic);
			if (!NT_STATUS_IS_OK(nt_status)) {
				DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
					nt_errstr(nt_status)));
			}
		}

		nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
							      spnego_state,
							      out_mem_ctx, 
							      nt_status,
							      unwrapped_out,
							      mech_list_mic,
							      out);
		
		spnego_free_data(&spnego);
		
		return nt_status;
	}
	case SPNEGO_CLIENT_TARG:
	{
		NTSTATUS nt_status;
		if (!in.length) {
			return NT_STATUS_INVALID_PARAMETER;
		}
		
		len = spnego_read_data(gensec_security, in, &spnego);
		
		if (len == -1) {
			DEBUG(1, ("Invalid SPNEGO request:\n"));
			dump_data(1, in.data, in.length);
			return NT_STATUS_INVALID_PARAMETER;
		}
		
		/* OK, so it's real SPNEGO, check the packet's the one we expect */
		if (spnego.type != spnego_state->expected_packet) {
			DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type, 
				  spnego_state->expected_packet));
			dump_data(1, in.data, in.length);
			spnego_free_data(&spnego);
			return NT_STATUS_INVALID_PARAMETER;
		}
	
		if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
			spnego_free_data(&spnego);
			return NT_STATUS_ACCESS_DENIED;
		}

		/* Server didn't like our choice of mech, and chose something else */
		if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
		    spnego.negTokenTarg.supportedMech &&
		    strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
			DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
				 gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech), 
				 gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid)));
			
			talloc_free(spnego_state->sub_sec_security);
			nt_status = gensec_subcontext_start(spnego_state,
							    gensec_security,
							    &spnego_state->sub_sec_security);
			if (!NT_STATUS_IS_OK(nt_status)) {
				spnego_free_data(&spnego);
				return nt_status;
			}
			/* select the sub context */
			nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
							     spnego.negTokenTarg.supportedMech);
			if (!NT_STATUS_IS_OK(nt_status)) {
				spnego_free_data(&spnego);
				return nt_status;
			}

			nt_status = gensec_update(spnego_state->sub_sec_security,
						  out_mem_ctx, 
						  spnego.negTokenTarg.responseToken,
						  &unwrapped_out);
			spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
		} else if (spnego_state->no_response_expected) {
			if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
				DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
				nt_status = NT_STATUS_INVALID_PARAMETER;
			} else if (spnego.negTokenTarg.responseToken.length) {
				DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
				nt_status = NT_STATUS_INVALID_PARAMETER;
			} else {
				nt_status = NT_STATUS_OK;
			}
			if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
				nt_status = gensec_check_packet(spnego_state->sub_sec_security,
								out_mem_ctx,
								spnego_state->mech_types.data,
								spnego_state->mech_types.length,
								spnego_state->mech_types.data,
								spnego_state->mech_types.length,
								&spnego.negTokenTarg.mechListMIC);
				if (!NT_STATUS_IS_OK(nt_status)) {
					DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
						nt_errstr(nt_status)));
				}
			}
		} else {
			bool new_spnego = false;

			nt_status = gensec_update(spnego_state->sub_sec_security,
						  out_mem_ctx, 
						  spnego.negTokenTarg.responseToken, 
						  &unwrapped_out);

			if (NT_STATUS_IS_OK(nt_status)) {
				new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
								 GENSEC_FEATURE_NEW_SPNEGO);
			}
			if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
				nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
							       out_mem_ctx,
							       spnego_state->mech_types.data,
							       spnego_state->mech_types.length,
							       spnego_state->mech_types.data,
							       spnego_state->mech_types.length,
							       &mech_list_mic);
				if (!NT_STATUS_IS_OK(nt_status)) {
					DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
						nt_errstr(nt_status)));
				}
			}
			if (NT_STATUS_IS_OK(nt_status)) {
				spnego_state->no_response_expected = true;
			}
		} 
		
		spnego_free_data(&spnego);

		if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
			&& !NT_STATUS_IS_OK(nt_status)) {
			DEBUG(1, ("SPNEGO(%s) login failed: %s\n", 
				  spnego_state->sub_sec_security->ops->name, 
				  nt_errstr(nt_status)));
			return nt_status;
		}

		if (unwrapped_out.length) {
			/* compose reply */
			spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
			spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
			spnego_out.negTokenTarg.supportedMech = NULL;
			spnego_out.negTokenTarg.responseToken = unwrapped_out;
			spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
			
			if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
				DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
				return NT_STATUS_INVALID_PARAMETER;
			}
		
			spnego_state->state_position = SPNEGO_CLIENT_TARG;
			nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
		} else {

			/* all done - server has accepted, and we agree */
			*out = null_data_blob;

			if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
				/* unless of course it did not accept */
				DEBUG(1,("gensec_update ok but not accepted\n"));
				nt_status = NT_STATUS_INVALID_PARAMETER;
			}
		
			spnego_state->state_position = SPNEGO_DONE;
		}

		return nt_status;
	}
	case SPNEGO_DONE:
		/* We should not be called after we are 'done' */
		return NT_STATUS_INVALID_PARAMETER;
	}
	return NT_STATUS_INVALID_PARAMETER;
}

static void gensec_spnego_want_feature(struct gensec_security *gensec_security,
				       uint32_t feature)
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;

	if (!spnego_state || !spnego_state->sub_sec_security) {
		gensec_security->want_features |= feature;
		return;
	}

	gensec_want_feature(spnego_state->sub_sec_security,
			    feature);
}

static bool gensec_spnego_have_feature(struct gensec_security *gensec_security,
				       uint32_t feature) 
{
	struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
	if (!spnego_state->sub_sec_security) {
		return false;
	}
	
	return gensec_have_feature(spnego_state->sub_sec_security, 
				   feature);
}

static const char *gensec_spnego_oids[] = { 
	GENSEC_OID_SPNEGO,
	NULL 
};

static const struct gensec_security_ops gensec_spnego_security_ops = {
	.name		  = "spnego",
	.sasl_name	  = "GSS-SPNEGO",
	.auth_type	  = DCERPC_AUTH_TYPE_SPNEGO,
	.oid              = gensec_spnego_oids,
	.client_start     = gensec_spnego_client_start,
	.server_start     = gensec_spnego_server_start,
	.update 	  = gensec_spnego_update,
	.seal_packet	  = gensec_spnego_seal_packet,
	.sign_packet	  = gensec_spnego_sign_packet,
	.sig_size	  = gensec_spnego_sig_size,
	.max_wrapped_size = gensec_spnego_max_wrapped_size,
	.max_input_size	  = gensec_spnego_max_input_size,
	.check_packet	  = gensec_spnego_check_packet,
	.unseal_packet	  = gensec_spnego_unseal_packet,
	.packet_full_request = gensec_spnego_packet_full_request,
	.wrap             = gensec_spnego_wrap,
	.unwrap           = gensec_spnego_unwrap,
	.wrap_packets     = gensec_spnego_wrap_packets,
	.unwrap_packets   = gensec_spnego_unwrap_packets,
	.session_key	  = gensec_spnego_session_key,
	.session_info     = gensec_spnego_session_info,
	.want_feature     = gensec_spnego_want_feature,
	.have_feature     = gensec_spnego_have_feature,
	.enabled          = true,
	.priority         = GENSEC_SPNEGO
};

_PUBLIC_ NTSTATUS gensec_spnego_init(void)
{
	NTSTATUS ret;
	ret = gensec_register(&gensec_spnego_security_ops);
	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(0,("Failed to register '%s' gensec backend!\n",
			gensec_spnego_security_ops.name));
		return ret;
	}

	return ret;
}