summaryrefslogtreecommitdiff
path: root/source4/libcli/auth/gensec.c
blob: e0fa27359a2ec7eefa563b6366f2ac00de018256 (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
/* 
   Unix SMB/CIFS implementation.
 
   Generic Authentication Interface

   Copyright (C) Andrew Tridgell 2003
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
   
   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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "auth/auth.h"

/* the list of currently registered GENSEC backends */
const static struct gensec_security_ops **generic_security_ops;
static int gensec_num_backends;

static const struct gensec_security_ops *gensec_security_by_authtype(uint8_t auth_type)
{
	int i;
	for (i=0; i < gensec_num_backends; i++) {
		if (generic_security_ops[i]->auth_type == auth_type) {
			return generic_security_ops[i];
		}
	}

	return NULL;
}

static const struct gensec_security_ops *gensec_security_by_oid(const char *oid_string)
{
	int i;
	for (i=0; i < gensec_num_backends; i++) {
		if (generic_security_ops[i]->oid &&
		    (strcmp(generic_security_ops[i]->oid, oid_string) == 0)) {
			return generic_security_ops[i];
		}
	}

	return NULL;
}

static const struct gensec_security_ops *gensec_security_by_sasl_name(const char *sasl_name)
{
	int i;
	for (i=0; i < gensec_num_backends; i++) {
		if (generic_security_ops[i]->sasl_name 
		    && (strcmp(generic_security_ops[i]->sasl_name, sasl_name) == 0)) {
			return generic_security_ops[i];
		}
	}

	return NULL;
}

static const struct gensec_security_ops *gensec_security_by_name(const char *name)
{
	int i;
	for (i=0; i < gensec_num_backends; i++) {
		if (generic_security_ops[i]->name 
		    && (strcmp(generic_security_ops[i]->name, name) == 0)) {
			return generic_security_ops[i];
		}
	}

	return NULL;
}

const struct gensec_security_ops **gensec_security_all(int *num_backends_out)
{
	*num_backends_out = gensec_num_backends;
	return generic_security_ops;
}

const char **gensec_security_oids(TALLOC_CTX *mem_ctx, const char *skip) 
{
	int i, j = 0;
	const char **oid_list;
	int num_backends;
	const struct gensec_security_ops **ops = gensec_security_all(&num_backends);
	if (!ops) {
		return NULL;
	}
	oid_list = talloc_array(mem_ctx, const char *, num_backends + 1);
	if (!oid_list) {
		return NULL;
	}
	
	for (i=0; i<num_backends; i++) {
		if (!ops[i]->oid) {
			continue;
		}
		
		if (skip && strcmp(skip, ops[i]->oid)==0) {
			continue;
		}

		oid_list[j] = ops[i]->oid;
		j++;
	}
	oid_list[j] = NULL;
	return oid_list;
}

/**
  Start the GENSEC system, returning a context pointer.
  @param mem_ctx The parent TALLOC memory context.
  @param gensec_security Returned GENSEC context pointer.
  @note  The mem_ctx is only a parent and may be NULL.
*/
static NTSTATUS gensec_start(TALLOC_CTX *mem_ctx, struct gensec_security **gensec_security) 
{
	(*gensec_security) = talloc(mem_ctx, struct gensec_security);
	if (!(*gensec_security)) {
		return NT_STATUS_NO_MEMORY;
	}

	(*gensec_security)->ops = NULL;

	ZERO_STRUCT((*gensec_security)->user);
	ZERO_STRUCT((*gensec_security)->target);
	ZERO_STRUCT((*gensec_security)->default_user);

	(*gensec_security)->default_user.name = "";
	(*gensec_security)->default_user.domain = talloc_strdup(*gensec_security, lp_workgroup());
	(*gensec_security)->default_user.realm = talloc_strdup(*gensec_security, lp_realm());

	(*gensec_security)->subcontext = False;
	(*gensec_security)->want_features = 0;
	return NT_STATUS_OK;
}

/** 
 * Start a GENSEC subcontext, with a copy of the properties of the parent
 * @param mem_ctx The parent TALLOC memory context.
 * @param parent The parent GENSEC context 
 * @param gensec_security Returned GENSEC context pointer.
 * @note Used by SPENGO in particular, for the actual implementation mechanism
 */

NTSTATUS gensec_subcontext_start(TALLOC_CTX *mem_ctx, 
				 struct gensec_security *parent, 
				 struct gensec_security **gensec_security)
{
	(*gensec_security) = talloc(mem_ctx, struct gensec_security);
	if (!(*gensec_security)) {
		return NT_STATUS_NO_MEMORY;
	}

	(**gensec_security) = *parent;
	(*gensec_security)->ops = NULL;
	(*gensec_security)->private_data = NULL;

	(*gensec_security)->subcontext = True;

	return NT_STATUS_OK;
}

/**
  Start the GENSEC system, in client mode, returning a context pointer.
  @param mem_ctx The parent TALLOC memory context.
  @param gensec_security Returned GENSEC context pointer.
  @note  The mem_ctx is only a parent and may be NULL.
*/
NTSTATUS gensec_client_start(TALLOC_CTX *mem_ctx, struct gensec_security **gensec_security)
{
	NTSTATUS status;
	status = gensec_start(mem_ctx, gensec_security);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}
	(*gensec_security)->gensec_role = GENSEC_CLIENT;
	(*gensec_security)->password_callback = NULL;

	ZERO_STRUCT((*gensec_security)->user);

	return status;
}

/**
  Start the GENSEC system, in server mode, returning a context pointer.
  @param mem_ctx The parent TALLOC memory context.
  @param gensec_security Returned GENSEC context pointer.
  @note  The mem_ctx is only a parent and may be NULL.
*/
NTSTATUS gensec_server_start(TALLOC_CTX *mem_ctx, struct gensec_security **gensec_security)
{
	NTSTATUS status;
	status = gensec_start(mem_ctx, gensec_security);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}
	(*gensec_security)->gensec_role = GENSEC_SERVER;

	return status;
}

static NTSTATUS gensec_start_mech(struct gensec_security *gensec_security) 
{
	NTSTATUS status;
	DEBUG(5, ("Starting GENSEC %smechanism %s\n", 
		  gensec_security->subcontext ? "sub" : "", 
		  gensec_security->ops->name));
	switch (gensec_security->gensec_role) {
	case GENSEC_CLIENT:
		if (gensec_security->ops->client_start) {
			status = gensec_security->ops->client_start(gensec_security);
			if (!NT_STATUS_IS_OK(status)) {
				DEBUG(1, ("Failed to start GENSEC client mech %s: %s\n",
					  gensec_security->ops->name, nt_errstr(status))); 
			}
			return status;
		}
	case GENSEC_SERVER:
		if (gensec_security->ops->server_start) {
			status = gensec_security->ops->server_start(gensec_security);
			if (!NT_STATUS_IS_OK(status)) {
				DEBUG(1, ("Failed to start GENSEC server mech %s: %s\n",
					  gensec_security->ops->name, nt_errstr(status))); 
			}
			return status;
		}
	}
	return NT_STATUS_INVALID_PARAMETER;
}

/** 
 * Start a GENSEC sub-mechanism by DCERPC allocated 'auth type' number 
 * @param gensec_security GENSEC context pointer.
 * @param auth_type DCERPC auth type
 * @param auth_level DCERPC auth level 
 */

NTSTATUS gensec_start_mech_by_authtype(struct gensec_security *gensec_security, 
				       uint8_t auth_type, uint8_t auth_level) 
{
	gensec_security->ops = gensec_security_by_authtype(auth_type);
	if (!gensec_security->ops) {
		DEBUG(3, ("Could not find GENSEC backend for auth_type=%d\n", (int)auth_type));
		return NT_STATUS_INVALID_PARAMETER;
	}
	gensec_want_feature(gensec_security, GENSEC_FEATURE_DCE_STYLE);
	if (auth_level == DCERPC_AUTH_LEVEL_INTEGRITY) {
		gensec_want_feature(gensec_security, GENSEC_FEATURE_SIGN);
	}
	if (auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
		gensec_want_feature(gensec_security, GENSEC_FEATURE_SIGN);
		gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
	}

	return gensec_start_mech(gensec_security);
}

const char *gensec_get_name_by_authtype(uint8_t authtype) 
{
	const struct gensec_security_ops *ops;
	ops = gensec_security_by_authtype(authtype);
	if (ops) {
		return ops->name;
	}
	return NULL;
}
	

const char *gensec_get_name_by_oid(const char *oid_string) 
{
	const struct gensec_security_ops *ops;
	ops = gensec_security_by_oid(oid_string);
	if (ops) {
		return ops->name;
	}
	return NULL;
}
	

/** 
 * Start a GENSEC sub-mechanism by OID, used in SPNEGO
 *
 * @note This should also be used when you wish to just start NLTMSSP (for example), as it uses a
 *       well-known #define to hook it in.
 */

NTSTATUS gensec_start_mech_by_oid(struct gensec_security *gensec_security, 
				  const char *mech_oid) 
{
	gensec_security->ops = gensec_security_by_oid(mech_oid);
	if (!gensec_security->ops) {
		DEBUG(3, ("Could not find GENSEC backend for oid=%s\n", mech_oid));
		return NT_STATUS_INVALID_PARAMETER;
	}
	return gensec_start_mech(gensec_security);
}

/** 
 * Start a GENSEC sub-mechanism by a well know SASL name
 *
 */

NTSTATUS gensec_start_mech_by_sasl_name(struct gensec_security *gensec_security, 
					const char *sasl_name) 
{
	gensec_security->ops = gensec_security_by_sasl_name(sasl_name);
	if (!gensec_security->ops) {
		DEBUG(3, ("Could not find GENSEC backend for sasl_name=%s\n", sasl_name));
		return NT_STATUS_INVALID_PARAMETER;
	}
	return gensec_start_mech(gensec_security);
}

/*
  wrappers for the gensec function pointers
*/
NTSTATUS gensec_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, 
			      DATA_BLOB *sig)
{
	if (!gensec_security->ops->unseal_packet) {
		return NT_STATUS_NOT_IMPLEMENTED;
	}
	if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
		if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
			return gensec_check_packet(gensec_security, mem_ctx, 
						   data, length, 
						   whole_pdu, pdu_length, 
						   sig);
		}
		return NT_STATUS_INVALID_PARAMETER;
	}

	return gensec_security->ops->unseal_packet(gensec_security, mem_ctx, 
						   data, length, 
						   whole_pdu, pdu_length, 
						   sig);
}

NTSTATUS gensec_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)
{
	if (!gensec_security->ops->check_packet) {
		return NT_STATUS_NOT_IMPLEMENTED;
	}
	if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_security->ops->check_packet(gensec_security, mem_ctx, data, length, whole_pdu, pdu_length, sig);
}

NTSTATUS gensec_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)
{
	if (!gensec_security->ops->seal_packet) {
		return NT_STATUS_NOT_IMPLEMENTED;
	}
	if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
		if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
			return gensec_sign_packet(gensec_security, mem_ctx, 
						  data, length, 
						  whole_pdu, pdu_length, 
						  sig);
		}
		return NT_STATUS_INVALID_PARAMETER;
	}

	return gensec_security->ops->seal_packet(gensec_security, mem_ctx, data, length, whole_pdu, pdu_length, sig);
}

NTSTATUS gensec_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)
{
	if (!gensec_security->ops->sign_packet) {
		return NT_STATUS_NOT_IMPLEMENTED;
	}
	if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	return gensec_security->ops->sign_packet(gensec_security, mem_ctx, data, length, whole_pdu, pdu_length, sig);
}

size_t gensec_sig_size(struct gensec_security *gensec_security) 
{
	if (!gensec_security->ops->sig_size) {
		return 0;
	}
	if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
		return 0;
	}
	
	return gensec_security->ops->sig_size(gensec_security);
}

NTSTATUS gensec_wrap(struct gensec_security *gensec_security, 
		     TALLOC_CTX *mem_ctx, 
		     const DATA_BLOB *in, 
		     DATA_BLOB *out) 
{
	if (!gensec_security->ops->wrap) {
		return NT_STATUS_NOT_IMPLEMENTED;
	}
	return gensec_security->ops->wrap(gensec_security, mem_ctx, in, out);
}

NTSTATUS gensec_unwrap(struct gensec_security *gensec_security, 
		       TALLOC_CTX *mem_ctx, 
		       const DATA_BLOB *in, 
		       DATA_BLOB *out) 
{
	if (!gensec_security->ops->unwrap) {
		return NT_STATUS_NOT_IMPLEMENTED;
	}
	return gensec_security->ops->unwrap(gensec_security, mem_ctx, in, out);
}

NTSTATUS gensec_session_key(struct gensec_security *gensec_security, 
			    DATA_BLOB *session_key)
{
	if (!gensec_security->ops->session_key) {
		return NT_STATUS_NOT_IMPLEMENTED;
	}
	return gensec_security->ops->session_key(gensec_security, session_key);
}

/** 
 * Return the credentials of a logged on user, including session keys
 * etc.
 *
 * Only valid after a successful authentication
 *
 * May only be called once per authentication.
 *
 */

NTSTATUS gensec_session_info(struct gensec_security *gensec_security, 
			     struct auth_session_info **session_info)
{
	if (!gensec_security->ops->session_info) {
		return NT_STATUS_NOT_IMPLEMENTED;
	}
	return gensec_security->ops->session_info(gensec_security, session_info);
}

/**
 * Next state function for the GENSEC state machine
 * 
 * @param gensec_security GENSEC State
 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 * @param in The request, as a DATA_BLOB
 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent, 
 *                or NT_STATUS_OK if the user is authenticated. 
 */

NTSTATUS gensec_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx, 
		       const DATA_BLOB in, DATA_BLOB *out) 
{
	return gensec_security->ops->update(gensec_security, out_mem_ctx, in, out);
}

/** 
 * Set the requirement for a certain feature on the connection
 *
 */

void gensec_want_feature(struct gensec_security *gensec_security,
			 uint32_t feature) 
{
	gensec_security->want_features |= feature;
}

/** 
 * Check the requirement for a certain feature on the connection
 *
 */

BOOL gensec_have_feature(struct gensec_security *gensec_security,
			 uint32_t feature) 
{
	if (!gensec_security->ops->have_feature) {
		return False;
	}
	return gensec_security->ops->have_feature(gensec_security, feature);
}

/** 
 * Set a username on a GENSEC context - ensures it is talloc()ed 
 *
 */

NTSTATUS gensec_set_unparsed_username(struct gensec_security *gensec_security, const char *user) 
{
	char *p;
	char *u = talloc_strdup(gensec_security, user);
	if (!u) {
		return NT_STATUS_NO_MEMORY;
	}

	p = strchr_m(user, '@');
	
	if (p) {
		*p = '\0';
		gensec_security->user.name = talloc_strdup(gensec_security, u);
		if (!gensec_security->user.name) {
			return NT_STATUS_NO_MEMORY;
		}
		
		gensec_security->user.realm = talloc_strdup(gensec_security, p+1);
		if (!gensec_security->user.realm) {
			return NT_STATUS_NO_MEMORY;
		}
		return NT_STATUS_OK;
	} 

	p = strchr_m(user, '\\');
	if (!p) {
		p = strchr_m(user, '/');
	}
	
	if (p) {
		*p = '\0';
		gensec_security->user.domain = talloc_strdup(gensec_security, u);
		if (!gensec_security->user.domain) {
			return NT_STATUS_NO_MEMORY;
		}
		gensec_security->user.name = talloc_strdup(gensec_security, p+1);
		if (!gensec_security->user.name) {
			return NT_STATUS_NO_MEMORY;
		}
		
		return NT_STATUS_OK;
	} 
	
	gensec_security->user.name = u;
	if (!gensec_security->user.name) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

/** 
 * Set a username on a GENSEC context - ensures it is talloc()ed 
 *
 */

NTSTATUS gensec_set_username(struct gensec_security *gensec_security, const char *user) 
{
	gensec_security->user.name = talloc_strdup(gensec_security, user);
	if (!gensec_security->user.name) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

/** 
 * Set a username on a GENSEC context - ensures it is talloc()ed 
 *
 */

const char *gensec_get_username(struct gensec_security *gensec_security) 
{
	if (gensec_security->user.name) {
		return gensec_security->user.name;
	}
	return gensec_security->default_user.name;
}

/** 
 * Set a domain on a GENSEC context - ensures it is talloc()ed 
 *
 */

NTSTATUS gensec_set_domain(struct gensec_security *gensec_security, const char *domain) 
{
	gensec_security->user.domain = talloc_strdup(gensec_security, domain);
	if (!gensec_security->user.domain) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

/** 
 * Return the NT domain for this GENSEC context
 *
 */

const char *gensec_get_domain(struct gensec_security *gensec_security) 
{
	if (gensec_security->user.domain) {
		return gensec_security->user.domain;
	} else if (gensec_security->user.realm) {
		return gensec_security->user.realm;
	}
	return gensec_security->default_user.domain;
}

/** 
 * Set a kerberos realm on a GENSEC context - ensures it is talloc()ed 
 *
 */

NTSTATUS gensec_set_realm(struct gensec_security *gensec_security, const char *realm) 
{
	gensec_security->user.realm = talloc_strdup(gensec_security, realm);
	if (!gensec_security->user.realm) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

/** 
 * Return the Krb5 realm for this context
 *
 */

const char *gensec_get_realm(struct gensec_security *gensec_security) 
{
	if (gensec_security->user.realm) {
		return gensec_security->user.realm;
	} else if (gensec_security->user.domain) {
		return gensec_security->user.domain;
	}
	return gensec_security->default_user.realm;
}

/** 
 * Return a kerberos principal for this context, if one has been set 
 *
 */

char *gensec_get_client_principal(struct gensec_security *gensec_security, TALLOC_CTX *mem_ctx) 
{
	const char *realm = gensec_get_realm(gensec_security);
	if (realm) {
		return talloc_asprintf(mem_ctx, "%s@%s", 
				       gensec_get_username(gensec_security), 
				       gensec_get_realm(gensec_security));
	} else {
		return talloc_strdup(mem_ctx, gensec_get_username(gensec_security));
	}
}

/** 
 * Set the password outright on GENSEC context - ensures it is talloc()ed, and that we will
 * not do a callback
 *
 */

NTSTATUS gensec_set_password(struct gensec_security *gensec_security,
			     const char *password) 
{
	gensec_security->user.password = talloc_strdup(gensec_security, password);
	if (password && !gensec_security->user.password) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

/** 
 * Set the target principal name (if already known) on a GENSEC context - ensures it is talloc()ed 
 *
 */

NTSTATUS gensec_set_target_principal(struct gensec_security *gensec_security, const char *principal) 
{
	gensec_security->target.principal = talloc_strdup(gensec_security, principal);
	if (!gensec_security->target.principal) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

/** 
 * Set the target service (such as 'http' or 'host') on a GENSEC context - ensures it is talloc()ed 
 *
 */

NTSTATUS gensec_set_target_service(struct gensec_security *gensec_security, const char *service) 
{
	gensec_security->target.service = talloc_strdup(gensec_security, service);
	if (!gensec_security->target.service) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

/** 
 * Set the target hostname (suitable for kerberos resolutation) on a GENSEC context - ensures it is talloc()ed 
 *
 */

NTSTATUS gensec_set_target_hostname(struct gensec_security *gensec_security, const char *hostname) 
{
	gensec_security->target.hostname = talloc_strdup(gensec_security, hostname);
	if (!gensec_security->target.hostname) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

const char *gensec_get_target_hostname(struct gensec_security *gensec_security) 
{
	if (gensec_security->target.hostname) {
		return gensec_security->target.hostname;
	}

	/* TODO: Add a 'set sockaddr' call, and do a reverse lookup */
	return NULL;
}

const char *gensec_get_target_service(struct gensec_security *gensec_security) 
{
	if (gensec_security->target.service) {
		return gensec_security->target.service;
	}

	return "host";
}

const char *gensec_get_target_principal(struct gensec_security *gensec_security) 
{
	const char *mechListMIC;
	
	if (gensec_security->target.principal) {
		return gensec_security->target.principal;
	}

	mechListMIC = talloc_asprintf(gensec_security,"%s$@%s",
				      lp_netbios_name(),
				      lp_realm());
	return mechListMIC;
}

/** 
 * Set a password callback, if the gensec module we use demands a password
 */

void gensec_set_password_callback(struct gensec_security *gensec_security, 
				  gensec_password_callback callback, void *callback_private_data) 
{
	gensec_security->password_callback = callback;
	gensec_security->password_callback_private = callback_private_data;
}

/**
 * Get (or call back for) a password.
 */

NTSTATUS gensec_get_password(struct gensec_security *gensec_security,
			     TALLOC_CTX *mem_ctx, 
			     char **password) 
{
	if (gensec_security->user.password) {
		*password = talloc_strdup(mem_ctx, gensec_security->user.password);
		if (!*password) {
			return NT_STATUS_NO_MEMORY;
		} else {
			return NT_STATUS_OK;
		}
	}
	if (!gensec_security->password_callback) {
		*password = NULL;
		return NT_STATUS_OK;
	}
	return gensec_security->password_callback(gensec_security, mem_ctx, password);
}

/*
  register a GENSEC backend. 

  The 'name' can be later used by other backends to find the operations
  structure for this backend.
*/
NTSTATUS gensec_register(const void *_ops)
{
	const struct gensec_security_ops *ops = _ops;
	
	if (!lp_parm_bool(-1, "gensec", ops->name, ops->enabled)) {
		DEBUG(2,("gensec subsystem %s is disabled\n", ops->name));
		return NT_STATUS_OK;
	}

	if (gensec_security_by_name(ops->name) != NULL) {
		/* its already registered! */
		DEBUG(0,("GENSEC backend '%s' already registered\n", 
			 ops->name));
		return NT_STATUS_OBJECT_NAME_COLLISION;
	}

	generic_security_ops = realloc_p(generic_security_ops, 
					 const struct gensec_security_ops *, 
					 gensec_num_backends+1);
	if (!generic_security_ops) {
		smb_panic("out of memory in gensec_register");
	}

	generic_security_ops[gensec_num_backends] = ops;

	gensec_num_backends++;

	DEBUG(3,("GENSEC backend '%s' registered\n", 
		 ops->name));

	return NT_STATUS_OK;
}

/*
  return the GENSEC interface version, and the size of some critical types
  This can be used by backends to either detect compilation errors, or provide
  multiple implementations for different smbd compilation options in one module
*/
const struct gensec_critical_sizes *gensec_interface_version(void)
{
	static const struct gensec_critical_sizes critical_sizes = {
		GENSEC_INTERFACE_VERSION,
		sizeof(struct gensec_security_ops),
		sizeof(struct gensec_security),
	};

	return &critical_sizes;
}

/*
  initialise the GENSEC subsystem
*/
NTSTATUS gensec_init(void)
{
	gensec_dcerpc_schannel_init();
	return NT_STATUS_OK;
}