summaryrefslogtreecommitdiff
path: root/source3/nsswitch/winbindd_util.c
blob: b1ced5b77f4766bfd55cbc350edfb8a60166a049 (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
/* 
   Unix SMB/CIFS implementation.

   Winbind daemon for ntdom nss module

   Copyright (C) Tim Potter 2000-2001
   Copyright (C) 2001 by Martin Pool <mbp@samba.org>
   
   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 "winbindd.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

extern struct winbindd_methods cache_methods;
extern struct winbindd_methods passdb_methods;

/**
 * @file winbindd_util.c
 *
 * Winbind daemon for NT domain authentication nss module.
 **/


/**
 * Used to clobber name fields that have an undefined value.
 *
 * Correct code should never look at a field that has this value.
 **/

static const fstring name_deadbeef = "<deadbeef>";

/* The list of trusted domains.  Note that the list can be deleted and
   recreated using the init_domain_list() function so pointers to
   individual winbindd_domain structures cannot be made.  Keep a copy of
   the domain name instead. */

static struct winbindd_domain *_domain_list;

/**
   When was the last scan of trusted domains done?
   
   0 == not ever
*/

static time_t last_trustdom_scan;

struct winbindd_domain *domain_list(void)
{
	/* Initialise list */

	if ((!_domain_list) && (!init_domain_list())) {
		smb_panic("Init_domain_list failed\n");
	}

	return _domain_list;
}

/* Free all entries in the trusted domain list */

void free_domain_list(void)
{
	struct winbindd_domain *domain = _domain_list;

	while(domain) {
		struct winbindd_domain *next = domain->next;
		
		DLIST_REMOVE(_domain_list, domain);
		SAFE_FREE(domain);
		domain = next;
	}
}

static BOOL is_internal_domain(const DOM_SID *sid)
{
	if (sid == NULL)
		return False;

	return (sid_check_is_domain(sid) || sid_check_is_builtin(sid));
}

static BOOL is_in_internal_domain(const DOM_SID *sid)
{
	if (sid == NULL)
		return False;

	return (sid_check_is_in_our_domain(sid) || sid_check_is_in_builtin(sid));
}


/* Add a trusted domain to our list of domains */
static struct winbindd_domain *add_trusted_domain(const char *domain_name, const char *alt_name,
						  struct winbindd_methods *methods,
						  const DOM_SID *sid)
{
	struct winbindd_domain *domain;
	const char *alternative_name = NULL;
	
	/* ignore alt_name if we are not in an AD domain */
	
	if ( (lp_security() == SEC_ADS) && alt_name && *alt_name) {
		alternative_name = alt_name;
	}
        
	/* We can't call domain_list() as this function is called from
	   init_domain_list() and we'll get stuck in a loop. */
	for (domain = _domain_list; domain; domain = domain->next) {
		if (strequal(domain_name, domain->name) ||
		    strequal(domain_name, domain->alt_name)) {
			return domain;
		}
		if (alternative_name && *alternative_name) {
			if (strequal(alternative_name, domain->name) ||
			    strequal(alternative_name, domain->alt_name)) {
				return domain;
			}
		}
		if (sid) {
			if (is_null_sid(sid)) {
				
			} else if (sid_equal(sid, &domain->sid)) {
				return domain;
			}
		}
	}
        
	/* Create new domain entry */

	if ((domain = SMB_MALLOC_P(struct winbindd_domain)) == NULL)
		return NULL;

	/* Fill in fields */
        
	ZERO_STRUCTP(domain);

	/* prioritise the short name */
	if (strchr_m(domain_name, '.') && alternative_name && *alternative_name) {
		fstrcpy(domain->name, alternative_name);
		fstrcpy(domain->alt_name, domain_name);
	} else {
		fstrcpy(domain->name, domain_name);
		if (alternative_name) {
			fstrcpy(domain->alt_name, alternative_name);
		}
	}

	domain->methods = methods;
	domain->backend = NULL;
	domain->internal = is_internal_domain(sid);
	domain->sequence_number = DOM_SEQUENCE_NONE;
	domain->last_seq_check = 0;
	domain->initialized = False;
	domain->online = is_internal_domain(sid);
	domain->check_online_timeout = 0;
	if (sid) {
		sid_copy(&domain->sid, sid);
	}
	
	/* Link to domain list */
	DLIST_ADD(_domain_list, domain);
        
	DEBUG(2,("Added domain %s %s %s\n", 
		 domain->name, domain->alt_name,
		 &domain->sid?sid_string_static(&domain->sid):""));
        
	return domain;
}

/********************************************************************
  rescan our domains looking for new trusted domains
********************************************************************/

struct trustdom_state {
	TALLOC_CTX *mem_ctx;
	struct winbindd_response *response;
};

static void trustdom_recv(void *private_data, BOOL success);

static void add_trusted_domains( struct winbindd_domain *domain )
{
	TALLOC_CTX *mem_ctx;
	struct winbindd_request *request;
	struct winbindd_response *response;

	struct trustdom_state *state;

	mem_ctx = talloc_init("add_trusted_domains");
	if (mem_ctx == NULL) {
		DEBUG(0, ("talloc_init failed\n"));
		return;
	}

	request = TALLOC_ZERO_P(mem_ctx, struct winbindd_request);
	response = TALLOC_P(mem_ctx, struct winbindd_response);
	state = TALLOC_P(mem_ctx, struct trustdom_state);

	if ((request == NULL) || (response == NULL) || (state == NULL)) {
		DEBUG(0, ("talloc failed\n"));
		talloc_destroy(mem_ctx);
		return;
	}

	state->mem_ctx = mem_ctx;
	state->response = response;

	request->length = sizeof(*request);
	request->cmd = WINBINDD_LIST_TRUSTDOM;

	async_domain_request(mem_ctx, domain, request, response,
			     trustdom_recv, state);
}

static void trustdom_recv(void *private_data, BOOL success)
{
	struct trustdom_state *state =
		talloc_get_type_abort(private_data, struct trustdom_state);
	struct winbindd_response *response = state->response;
	char *p;

	if ((!success) || (response->result != WINBINDD_OK)) {
		DEBUG(1, ("Could not receive trustdoms\n"));
		talloc_destroy(state->mem_ctx);
		return;
	}

	p = (char *)response->extra_data.data;

	while ((p != NULL) && (*p != '\0')) {
		char *q, *sidstr, *alt_name;
		DOM_SID sid;

		alt_name = strchr(p, '\\');
		if (alt_name == NULL) {
			DEBUG(0, ("Got invalid trustdom response\n"));
			break;
		}

		*alt_name = '\0';
		alt_name += 1;

		sidstr = strchr(alt_name, '\\');
		if (sidstr == NULL) {
			DEBUG(0, ("Got invalid trustdom response\n"));
			break;
		}

		*sidstr = '\0';
		sidstr += 1;

		q = strchr(sidstr, '\n');
		if (q != NULL)
			*q = '\0';

		if (!string_to_sid(&sid, sidstr)) {
			/* Allow NULL sid for sibling domains */
			if ( strcmp(sidstr,"S-0-0") == 0) {
				sid_copy( &sid, &global_sid_NULL);				
			} else {				
				DEBUG(0, ("Got invalid trustdom response\n"));
				break;
			}			
		}

		if (find_domain_from_name_noinit(p) == NULL) {
			struct winbindd_domain *domain;
			char *alternate_name = NULL;
			
			/* use the real alt_name if we have one, else pass in NULL */

			if ( !strequal( alt_name, "(null)" ) )
				alternate_name = alt_name;

			domain = add_trusted_domain(p, alternate_name,
						    &cache_methods,
						    &sid);
			setup_domain_child(domain, &domain->child, NULL);
			if (!domain->internal) {
				/* Even in the parent winbindd we'll need to
				   talk to the DC, so try and see if we can
				   contact it. Theoretically this isn't neccessary
				   as the init_dc_connection() in init_child_recv()
				   will do this, but we can start detecting the DC
				   early here. */
				set_domain_online_request(domain);
			}
		}
		p=q;
		if (p != NULL)
			p += 1;
	}

	SAFE_FREE(response->extra_data.data);
	talloc_destroy(state->mem_ctx);
}

/********************************************************************
 Periodically we need to refresh the trusted domain cache for smbd 
********************************************************************/

void rescan_trusted_domains( void )
{
	time_t now = time(NULL);
	
	/* see if the time has come... */
	
	if ((now >= last_trustdom_scan) &&
	    ((now-last_trustdom_scan) < WINBINDD_RESCAN_FREQ) )
		return;
		
	/* this will only add new domains we didn't already know about */
	
	add_trusted_domains( find_our_domain() );

	last_trustdom_scan = now;
	
	return;	
}

struct init_child_state {
	TALLOC_CTX *mem_ctx;
	struct winbindd_domain *domain;
	struct winbindd_request *request;
	struct winbindd_response *response;
	void (*continuation)(void *private_data, BOOL success);
	void *private_data;
};

static void init_child_recv(void *private_data, BOOL success);
static void init_child_getdc_recv(void *private_data, BOOL success);

enum winbindd_result init_child_connection(struct winbindd_domain *domain,
					   void (*continuation)(void *private_data,
								BOOL success),
					   void *private_data)
{
	TALLOC_CTX *mem_ctx;
	struct winbindd_request *request;
	struct winbindd_response *response;
	struct init_child_state *state;
	struct winbindd_domain *request_domain;

	mem_ctx = talloc_init("init_child_connection");
	if (mem_ctx == NULL) {
		DEBUG(0, ("talloc_init failed\n"));
		return WINBINDD_ERROR;
	}

	request = TALLOC_ZERO_P(mem_ctx, struct winbindd_request);
	response = TALLOC_P(mem_ctx, struct winbindd_response);
	state = TALLOC_P(mem_ctx, struct init_child_state);

	if ((request == NULL) || (response == NULL) || (state == NULL)) {
		DEBUG(0, ("talloc failed\n"));
		TALLOC_FREE(mem_ctx);
		continuation(private_data, False);
		return WINBINDD_ERROR;
	}

	request->length = sizeof(*request);

	state->mem_ctx = mem_ctx;
	state->domain = domain;
	state->request = request;
	state->response = response;
	state->continuation = continuation;
	state->private_data = private_data;

	if (IS_DC || domain->primary) {
		/* The primary domain has to find the DC name itself */
		request->cmd = WINBINDD_INIT_CONNECTION;
		fstrcpy(request->domain_name, domain->name);
		request->data.init_conn.is_primary = True;
		fstrcpy(request->data.init_conn.dcname, "");
		async_request(mem_ctx, &domain->child, request, response,
			      init_child_recv, state);
		return WINBINDD_PENDING;
	}

	/* This is *not* the primary domain, let's ask our DC about a DC
	 * name */

	request->cmd = WINBINDD_GETDCNAME;
	fstrcpy(request->domain_name, domain->name);

	/* save online flag */
	request_domain = find_our_domain();
	request_domain->online = domain->online;
	
	async_domain_request(mem_ctx, request_domain, request, response,
			     init_child_getdc_recv, state);
	return WINBINDD_PENDING;
}

static void init_child_getdc_recv(void *private_data, BOOL success)
{
	struct init_child_state *state =
		talloc_get_type_abort(private_data, struct init_child_state);
	const char *dcname = "";

	DEBUG(10, ("Received getdcname response\n"));

	if (success && (state->response->result == WINBINDD_OK)) {
		dcname = state->response->data.dc_name;
	}

	state->request->cmd = WINBINDD_INIT_CONNECTION;
	fstrcpy(state->request->domain_name, state->domain->name);
	state->request->data.init_conn.is_primary = False;
	fstrcpy(state->request->data.init_conn.dcname, dcname);

	async_request(state->mem_ctx, &state->domain->child,
		      state->request, state->response,
		      init_child_recv, state);
}

static void init_child_recv(void *private_data, BOOL success)
{
	struct init_child_state *state =
		talloc_get_type_abort(private_data, struct init_child_state);

	DEBUG(5, ("Received child initialization response for domain %s\n",
		  state->domain->name));

	if ((!success) || (state->response->result != WINBINDD_OK)) {
		DEBUG(3, ("Could not init child\n"));
		state->continuation(state->private_data, False);
		talloc_destroy(state->mem_ctx);
		return;
	}

	fstrcpy(state->domain->name,
		state->response->data.domain_info.name);
	fstrcpy(state->domain->alt_name,
		state->response->data.domain_info.alt_name);
	string_to_sid(&state->domain->sid,
		      state->response->data.domain_info.sid);
	state->domain->native_mode =
		state->response->data.domain_info.native_mode;
	state->domain->active_directory =
		state->response->data.domain_info.active_directory;
	state->domain->sequence_number =
		state->response->data.domain_info.sequence_number;

	init_dc_connection(state->domain);

	if (state->continuation != NULL)
		state->continuation(state->private_data, True);
	talloc_destroy(state->mem_ctx);
}

enum winbindd_result winbindd_dual_init_connection(struct winbindd_domain *domain,
						   struct winbindd_cli_state *state)
{
	/* Ensure null termination */
	state->request.domain_name
		[sizeof(state->request.domain_name)-1]='\0';
	state->request.data.init_conn.dcname
		[sizeof(state->request.data.init_conn.dcname)-1]='\0';

	if (strlen(state->request.data.init_conn.dcname) > 0) {
		fstrcpy(domain->dcname, state->request.data.init_conn.dcname);
	}

	init_dc_connection(domain);

	if (!domain->initialized) {
		/* If we return error here we can't do any cached authentication,
		   but we may be in disconnected mode and can't initialize correctly.
		   Do what the previous code did and just return without initialization,
		   once we go online we'll re-initialize.
		*/
		DEBUG(5, ("winbindd_dual_init_connection: %s returning without initialization "
			"online = %d\n", domain->name, (int)domain->online ));
	}

	fstrcpy(state->response.data.domain_info.name, domain->name);
	fstrcpy(state->response.data.domain_info.alt_name, domain->alt_name);
	fstrcpy(state->response.data.domain_info.sid,
		sid_string_static(&domain->sid));
	
	state->response.data.domain_info.native_mode
		= domain->native_mode;
	state->response.data.domain_info.active_directory
		= domain->active_directory;
	state->response.data.domain_info.primary
		= domain->primary;
	state->response.data.domain_info.sequence_number =
		domain->sequence_number;

	return WINBINDD_OK;
}

/* Look up global info for the winbind daemon */
BOOL init_domain_list(void)
{
	struct winbindd_domain *domain;
	int role = lp_server_role();

	/* Free existing list */
	free_domain_list();

	/* Add ourselves as the first entry. */

	if ( role == ROLE_DOMAIN_MEMBER ) {
		DOM_SID our_sid;

		if (!secrets_fetch_domain_sid(lp_workgroup(), &our_sid)) {
			DEBUG(0, ("Could not fetch our SID - did we join?\n"));
			return False;
		}
	
		domain = add_trusted_domain( lp_workgroup(), lp_realm(),
					     &cache_methods, &our_sid);
		domain->primary = True;
		setup_domain_child(domain, &domain->child, NULL);
		
		/* Even in the parent winbindd we'll need to
		   talk to the DC, so try and see if we can
		   contact it. Theoretically this isn't neccessary
		   as the init_dc_connection() in init_child_recv()
		   will do this, but we can start detecting the DC
		   early here. */
		set_domain_online_request(domain);
	}

	/* Local SAM */

	domain = add_trusted_domain(get_global_sam_name(), NULL,
				    &passdb_methods, get_global_sam_sid());
	if ( role != ROLE_DOMAIN_MEMBER ) {
		domain->primary = True;
	}
	setup_domain_child(domain, &domain->child, NULL);

	/* BUILTIN domain */

	domain = add_trusted_domain("BUILTIN", NULL, &passdb_methods,
				    &global_sid_Builtin);
	setup_domain_child(domain, &domain->child, NULL);

	return True;
}

/** 
 * Given a domain name, return the struct winbindd domain info for it 
 *
 * @note Do *not* pass lp_workgroup() to this function.  domain_list
 *       may modify it's value, and free that pointer.  Instead, our local
 *       domain may be found by calling find_our_domain().
 *       directly.
 *
 *
 * @return The domain structure for the named domain, if it is working.
 */

struct winbindd_domain *find_domain_from_name_noinit(const char *domain_name)
{
	struct winbindd_domain *domain;

	/* Search through list */

	for (domain = domain_list(); domain != NULL; domain = domain->next) {
		if (strequal(domain_name, domain->name) ||
		    (domain->alt_name[0] &&
		     strequal(domain_name, domain->alt_name))) {
			return domain;
		}
	}

	/* Not found */

	return NULL;
}

struct winbindd_domain *find_domain_from_name(const char *domain_name)
{
	struct winbindd_domain *domain;

	domain = find_domain_from_name_noinit(domain_name);

	if (domain == NULL)
		return NULL;

	if (!domain->initialized)
		init_dc_connection(domain);

	return domain;
}

/* Given a domain sid, return the struct winbindd domain info for it */

struct winbindd_domain *find_domain_from_sid_noinit(const DOM_SID *sid)
{
	struct winbindd_domain *domain;

	/* Search through list */

	for (domain = domain_list(); domain != NULL; domain = domain->next) {
		if (sid_compare_domain(sid, &domain->sid) == 0)
			return domain;
	}

	/* Not found */

	return NULL;
}

/* Given a domain sid, return the struct winbindd domain info for it */

struct winbindd_domain *find_domain_from_sid(const DOM_SID *sid)
{
	struct winbindd_domain *domain;

	domain = find_domain_from_sid_noinit(sid);

	if (domain == NULL)
		return NULL;

	if (!domain->initialized)
		init_dc_connection(domain);

	return domain;
}

struct winbindd_domain *find_our_domain(void)
{
	struct winbindd_domain *domain;

	/* Search through list */

	for (domain = domain_list(); domain != NULL; domain = domain->next) {
		if (domain->primary)
			return domain;
	}

	smb_panic("Could not find our domain\n");
	return NULL;
}

struct winbindd_domain *find_root_domain(void)
{
	struct winbindd_domain *ours = find_our_domain();	
	
	if ( !ours )
		return NULL;
	
	if ( strlen(ours->forest_name) == 0 )
		return NULL;
	
	return find_domain_from_name( ours->forest_name );
}

struct winbindd_domain *find_builtin_domain(void)
{
	DOM_SID sid;
	struct winbindd_domain *domain;

	string_to_sid(&sid, "S-1-5-32");
	domain = find_domain_from_sid(&sid);

	if (domain == NULL)
		smb_panic("Could not find BUILTIN domain\n");

	return domain;
}

/* Find the appropriate domain to lookup a name or SID */

struct winbindd_domain *find_lookup_domain_from_sid(const DOM_SID *sid)
{
	/* A DC can't ask the local smbd for remote SIDs, here winbindd is the
	 * one to contact the external DC's. On member servers the internal
	 * domains are different: These are part of the local SAM. */

	DEBUG(10, ("find_lookup_domain_from_sid(%s)\n",
		   sid_string_static(sid)));

	if (IS_DC || is_internal_domain(sid) || is_in_internal_domain(sid)) {
		DEBUG(10, ("calling find_domain_from_sid\n"));
		return find_domain_from_sid(sid);
	}

	/* On a member server a query for SID or name can always go to our
	 * primary DC. */

	DEBUG(10, ("calling find_our_domain\n"));
	return find_our_domain();
}

struct winbindd_domain *find_lookup_domain_from_name(const char *domain_name)
{
	if (IS_DC || strequal(domain_name, "BUILTIN") ||
	    strequal(domain_name, get_global_sam_name()))
		return find_domain_from_name_noinit(domain_name);

	return find_our_domain();
}

/* Lookup a sid in a domain from a name */

BOOL winbindd_lookup_sid_by_name(TALLOC_CTX *mem_ctx,
				 struct winbindd_domain *domain, 
				 const char *domain_name,
				 const char *name, DOM_SID *sid, 
				 enum lsa_SidType *type)
{
	NTSTATUS result;

	/* Lookup name */
	result = domain->methods->name_to_sid(domain, mem_ctx, domain_name, name, sid, type);

	/* Return rid and type if lookup successful */
	if (!NT_STATUS_IS_OK(result)) {
		*type = SID_NAME_UNKNOWN;
	}

	return NT_STATUS_IS_OK(result);
}

/**
 * @brief Lookup a name in a domain from a sid.
 *
 * @param sid Security ID you want to look up.
 * @param name On success, set to the name corresponding to @p sid.
 * @param dom_name On success, set to the 'domain name' corresponding to @p sid.
 * @param type On success, contains the type of name: alias, group or
 * user.
 * @retval True if the name exists, in which case @p name and @p type
 * are set, otherwise False.
 **/
BOOL winbindd_lookup_name_by_sid(TALLOC_CTX *mem_ctx,
				 DOM_SID *sid,
				 char **dom_name,
				 char **name,
				 enum lsa_SidType *type)
{
	NTSTATUS result;
	struct winbindd_domain *domain;

	*dom_name = NULL;
	*name = NULL;

	domain = find_lookup_domain_from_sid(sid);

	if (!domain) {
		DEBUG(1,("Can't find domain from sid\n"));
		return False;
	}

	/* Lookup name */

	result = domain->methods->sid_to_name(domain, mem_ctx, sid, dom_name, name, type);

	/* Return name and type if successful */
        
	if (NT_STATUS_IS_OK(result)) {
		return True;
	}

	*type = SID_NAME_UNKNOWN;
        
	return False;
}

/* Free state information held for {set,get,end}{pw,gr}ent() functions */

void free_getent_state(struct getent_state *state)
{
	struct getent_state *temp;

	/* Iterate over state list */

	temp = state;

	while(temp != NULL) {
		struct getent_state *next;

		/* Free sam entries then list entry */

		SAFE_FREE(state->sam_entries);
		DLIST_REMOVE(state, state);
		next = temp->next;

		SAFE_FREE(temp);
		temp = next;
	}
}

/* Is this a domain which we may assume no DOMAIN\ prefix? */

static BOOL assume_domain(const char *domain)
{
	/* never assume the domain on a standalone server */

	if ( lp_server_role() == ROLE_STANDALONE )
		return False;

	/* domain member servers may possibly assume for the domain name */

	if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
		if ( !strequal(lp_workgroup(), domain) )
			return False;

		if ( lp_winbind_use_default_domain() || lp_winbind_trusted_domains_only() )
			return True;
	} 

	/* only left with a domain controller */

	if ( strequal(get_global_sam_name(), domain) )  {
		return True;
	}
	
	return False;
}

/* Parse a string of the form DOMAIN\user into a domain and a user */

BOOL parse_domain_user(const char *domuser, fstring domain, fstring user)
{
	char *p = strchr(domuser,*lp_winbind_separator());

	if ( !p ) {
		fstrcpy(user, domuser);

		if ( assume_domain(lp_workgroup())) {
			fstrcpy(domain, lp_workgroup());
		} else {
			return False;
		}
	} else {
		fstrcpy(user, p+1);
		fstrcpy(domain, domuser);
		domain[PTR_DIFF(p, domuser)] = 0;
	}
	
	strupper_m(domain);
	
	return True;
}

BOOL parse_domain_user_talloc(TALLOC_CTX *mem_ctx, const char *domuser,
			      char **domain, char **user)
{
	fstring fstr_domain, fstr_user;
	if (!parse_domain_user(domuser, fstr_domain, fstr_user)) {
		return False;
	}
	*domain = talloc_strdup(mem_ctx, fstr_domain);
	*user = talloc_strdup(mem_ctx, fstr_user);
	return ((*domain != NULL) && (*user != NULL));
}

/* Ensure an incoming username from NSS is fully qualified. Replace the
   incoming fstring with DOMAIN <separator> user. Returns the same
   values as parse_domain_user() but also replaces the incoming username.
   Used to ensure all names are fully qualified within winbindd.
   Used by the NSS protocols of auth, chauthtok, logoff and ccache_ntlm_auth.
   The protocol definitions of auth_crap, chng_pswd_auth_crap
   really should be changed to use this instead of doing things
   by hand. JRA. */

BOOL canonicalize_username(fstring username_inout, fstring domain, fstring user)
{
	if (!parse_domain_user(username_inout, domain, user)) {
		return False;
	}
	slprintf(username_inout, sizeof(fstring) - 1, "%s%c%s",
		 domain, *lp_winbind_separator(),
		 user);
	return True;
}

/*
    Fill DOMAIN\\USERNAME entry accounting 'winbind use default domain' and
    'winbind separator' options.
    This means:
	- omit DOMAIN when 'winbind use default domain = true' and DOMAIN is
	lp_workgroup()

    If we are a PDC or BDC, and this is for our domain, do likewise.

    Also, if omit DOMAIN if 'winbind trusted domains only = true', as the 
    username is then unqualified in unix

    We always canonicalize as UPPERCASE DOMAIN, lowercase username.
*/
void fill_domain_username(fstring name, const char *domain, const char *user, BOOL can_assume)
{
	fstring tmp_user;

	fstrcpy(tmp_user, user);
	strlower_m(tmp_user);

	if (can_assume && assume_domain(domain)) {
		strlcpy(name, tmp_user, sizeof(fstring));
	} else {
		slprintf(name, sizeof(fstring) - 1, "%s%c%s",
			 domain, *lp_winbind_separator(),
			 tmp_user);
	}
}

/*
 * Winbindd socket accessor functions
 */

char *get_winbind_priv_pipe_dir(void) 
{
	return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
}

/* Open the winbindd socket */

static int _winbindd_socket = -1;
static int _winbindd_priv_socket = -1;

int open_winbindd_socket(void)
{
	if (_winbindd_socket == -1) {
		_winbindd_socket = create_pipe_sock(
			WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME, 0755);
		DEBUG(10, ("open_winbindd_socket: opened socket fd %d\n",
			   _winbindd_socket));
	}

	return _winbindd_socket;
}

int open_winbindd_priv_socket(void)
{
	if (_winbindd_priv_socket == -1) {
		_winbindd_priv_socket = create_pipe_sock(
			get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
		DEBUG(10, ("open_winbindd_priv_socket: opened socket fd %d\n",
			   _winbindd_priv_socket));
	}

	return _winbindd_priv_socket;
}

/* Close the winbindd socket */

void close_winbindd_socket(void)
{
	if (_winbindd_socket != -1) {
		DEBUG(10, ("close_winbindd_socket: closing socket fd %d\n",
			   _winbindd_socket));
		close(_winbindd_socket);
		_winbindd_socket = -1;
	}
	if (_winbindd_priv_socket != -1) {
		DEBUG(10, ("close_winbindd_socket: closing socket fd %d\n",
			   _winbindd_priv_socket));
		close(_winbindd_priv_socket);
		_winbindd_priv_socket = -1;
	}
}

/*
 * Client list accessor functions
 */

static struct winbindd_cli_state *_client_list;
static int _num_clients;

/* Return list of all connected clients */

struct winbindd_cli_state *winbindd_client_list(void)
{
	return _client_list;
}

/* Add a connection to the list */

void winbindd_add_client(struct winbindd_cli_state *cli)
{
	DLIST_ADD(_client_list, cli);
	_num_clients++;
}

/* Remove a client from the list */

void winbindd_remove_client(struct winbindd_cli_state *cli)
{
	DLIST_REMOVE(_client_list, cli);
	_num_clients--;
}

/* Close all open clients */

void winbindd_kill_all_clients(void)
{
	struct winbindd_cli_state *cl = winbindd_client_list();

	DEBUG(10, ("winbindd_kill_all_clients: going postal\n"));

	while (cl) {
		struct winbindd_cli_state *next;
		
		next = cl->next;
		winbindd_remove_client(cl);
		cl = next;
	}
}

/* Return number of open clients */

int winbindd_num_clients(void)
{
	return _num_clients;
}

NTSTATUS lookup_usergroups_cached(struct winbindd_domain *domain,
				  TALLOC_CTX *mem_ctx,
				  const DOM_SID *user_sid,
				  uint32 *p_num_groups, DOM_SID **user_sids)
{
	NET_USER_INFO_3 *info3 = NULL;
	NTSTATUS status = NT_STATUS_NO_MEMORY;
	int i;
	size_t num_groups = 0;
	DOM_SID group_sid, primary_group;
	
	DEBUG(3,(": lookup_usergroups_cached\n"));
	
	*user_sids = NULL;
	num_groups = 0;
	*p_num_groups = 0;

	info3 = netsamlogon_cache_get(mem_ctx, user_sid);

	if (info3 == NULL) {
		return NT_STATUS_OBJECT_NAME_NOT_FOUND;
	}

	if (info3->num_groups == 0) {
		SAFE_FREE(info3);
		return NT_STATUS_UNSUCCESSFUL;
	}
	
	/* always add the primary group to the sid array */
	sid_compose(&primary_group, &info3->dom_sid.sid, info3->user_rid);
	
	if (!add_sid_to_array(mem_ctx, &primary_group, user_sids, &num_groups)) {
		SAFE_FREE(info3);
		return NT_STATUS_NO_MEMORY;
	}

	for (i=0; i<info3->num_groups; i++) {
		sid_copy(&group_sid, &info3->dom_sid.sid);
		sid_append_rid(&group_sid, info3->gids[i].g_rid);

		if (!add_sid_to_array(mem_ctx, &group_sid, user_sids,
				 &num_groups)) {
			SAFE_FREE(info3);
			return NT_STATUS_NO_MEMORY;
		}
	}

	SAFE_FREE(info3);
	*p_num_groups = num_groups;
	status = (user_sids != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
	
	DEBUG(3,(": lookup_usergroups_cached succeeded\n"));

	return status;
}