summaryrefslogtreecommitdiff
path: root/source3/nsswitch/winbindd_util.c
blob: 9ae24e401fdd2f1e2fddc1341370cada4527632d (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
/* 
   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

/**
 * @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) 
		if (!init_domain_list()) 
			return NULL;

	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)
{
	extern DOM_SID global_sid_Builtin;

	if (sid == NULL)
		return False;

	if (sid_compare_domain(sid, get_global_sam_sid()) == 0)
		return True;

	if (sid_compare_domain(sid, &global_sid_Builtin) == 0)
		return True;

	return False;
}


/* 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,
						  DOM_SID *sid)
{
	struct winbindd_domain *domain;
	const char *alternative_name = NULL;
	static const DOM_SID null_sid;
	
	/* 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 (sid_equal(sid, &null_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;
	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
********************************************************************/

static void add_trusted_domains( struct winbindd_domain *domain )
{
	extern struct winbindd_methods cache_methods;
	TALLOC_CTX *mem_ctx;
	NTSTATUS result;
	time_t t;
	char **names;
	char **alt_names;
	int num_domains = 0;
	DOM_SID *dom_sids, null_sid;
	int i;
	struct winbindd_domain *new_domain;

	/* trusted domains might be disabled */
	if (!lp_allow_trusted_domains()) {
		return;
	}

	DEBUG(5, ("scanning trusted domain list\n"));

	if (!(mem_ctx = talloc_init("init_domain_list")))
		return;
	   
	ZERO_STRUCTP(&null_sid);

	t = time(NULL);
	
	/* ask the DC what domains it trusts */
	
	result = domain->methods->trusted_domains(domain, mem_ctx, (unsigned int *)&num_domains,
		&names, &alt_names, &dom_sids);
		
	if ( NT_STATUS_IS_OK(result) ) {

		/* Add each domain to the trusted domain list */
		
		for(i = 0; i < num_domains; i++) {
			DEBUG(10,("Found domain %s\n", names[i]));
			add_trusted_domain(names[i], alt_names?alt_names[i]:NULL,
					   &cache_methods, &dom_sids[i]);
					   
			/* if the SID was empty, we better set it now */
			
			if ( sid_equal(&dom_sids[i], &null_sid) ) {
			
				new_domain = find_domain_from_name(names[i]);
				 
				/* this should never happen */
				if ( !new_domain ) { 	
					DEBUG(0,("rescan_trust_domains: can't find the domain I just added! [%s]\n",
						names[i]));
					break;
				}
				 
				/* call the cache method; which will operate on the winbindd_domain \
				   passed in and choose either rpc or ads as appropriate */

				result = domain->methods->domain_sid( new_domain, &new_domain->sid );
				 
				if ( NT_STATUS_IS_OK(result) )
				 	sid_copy( &dom_sids[i], &new_domain->sid );
			}
			
			/* store trusted domain in the cache */
			trustdom_cache_store(names[i], alt_names ? alt_names[i] : NULL,
			                     &dom_sids[i], t + WINBINDD_RESCAN_FREQ);
		}
	}

	talloc_destroy(mem_ctx);
}

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

void rescan_trusted_domains( void )
{
	time_t now = time(NULL);
	struct winbindd_domain *mydomain = NULL;
	
	/* see if the time has come... */
	
	if ( (now > last_trustdom_scan) && ((now-last_trustdom_scan) < WINBINDD_RESCAN_FREQ) )
		return;
		
	if ( (mydomain = find_our_domain()) == NULL ) {
		DEBUG(0,("rescan_trusted_domains: Can't find my own domain!\n"));
		return;
	}
	
	/* this will only add new domains we didn't already know about */
	
	add_trusted_domains( mydomain );

	last_trustdom_scan = now;
	
	return;	
}

/* Look up global info for the winbind daemon */
BOOL init_domain_list(void)
{
	extern DOM_SID global_sid_Builtin;
	extern struct winbindd_methods cache_methods;
	extern struct winbindd_methods passdb_methods;
	struct winbindd_domain *domain;

	/* Free existing list */
	free_domain_list();

	/* Add ourselves as the first entry. */

	if (IS_DC) {
		domain = add_trusted_domain(get_global_sam_name(), NULL,
					    &passdb_methods, get_global_sam_sid());
	} else {
	
		domain = add_trusted_domain( lp_workgroup(), lp_realm(),
					     &cache_methods, NULL);
	
		/* set flags about native_mode, active_directory */
		set_dc_type_and_flags(domain);
	}

	domain->primary = True;

	/* get any alternate name for the primary domain */
	
	cache_methods.alternate_name(domain);
	
	/* now we have the correct netbios (short) domain name */
	
	if ( *domain->name )
		set_global_myworkgroup( domain->name );
		
	if (!secrets_fetch_domain_sid(domain->name, &domain->sid)) {
		DEBUG(1, ("Could not fetch sid for our domain %s\n",
			  domain->name));
		return False;
	}

	/* do an initial scan for trusted domains */
	add_trusted_domains(domain);


	/* Add our local SAM domains */

	add_trusted_domain("BUILTIN", NULL, &passdb_methods,
			   &global_sid_Builtin);

	if (!IS_DC) {
		add_trusted_domain(get_global_sam_name(), NULL,
				   &passdb_methods, get_global_sam_sid());
	}
	
	/* avoid rescanning this right away */
	last_trustdom_scan = time(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(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))) {
			if (!domain->initialized)
				set_dc_type_and_flags(domain);

			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;

	/* Search through list */

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

	/* Not found */

	return NULL;
}

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

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;
	}

	/* Not found */

	return NULL;
}

/* 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. */

	if (IS_DC || is_internal_domain(sid))
		return find_domain_from_sid(sid);

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

	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(domain_name);

	return find_our_domain();
}

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

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

	mem_ctx = talloc_init("lookup_sid_by_name for %s\\%s\n",
			      domain_name, name);
	if (!mem_ctx) 
		return False;
        
	/* Lookup name */
	result = domain->methods->name_to_sid(domain, mem_ctx, domain_name, name, sid, type);

	talloc_destroy(mem_ctx);
        
	/* 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(DOM_SID *sid,
				 fstring dom_name,
				 fstring name,
				 enum SID_NAME_USE *type)
{
	char *names;
	char *dom_names;
	NTSTATUS result;
	TALLOC_CTX *mem_ctx;
	BOOL rv = False;
	struct winbindd_domain *domain;

	domain = find_lookup_domain_from_sid(sid);

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

	/* Lookup name */

	if (!(mem_ctx = talloc_init("winbindd_lookup_name_by_sid")))
		return False;
        
	result = domain->methods->sid_to_name(domain, mem_ctx, sid, &dom_names, &names, type);

	/* Return name and type if successful */
        
	if ((rv = NT_STATUS_IS_OK(result))) {
		fstrcpy(dom_name, dom_names);
		fstrcpy(name, names);
	} else {
		*type = SID_NAME_UNKNOWN;
		fstrcpy(name, name_deadbeef);
	}
        
	talloc_destroy(mem_ctx);

	return rv;
}


/* 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;
	}
}

/* Parse winbindd related parameters */

BOOL winbindd_param_init(void)
{
	/* Parse winbind uid and winbind_gid parameters */

	if (!lp_idmap_uid(&server_state.uid_low, &server_state.uid_high)) {
		DEBUG(0, ("winbindd: idmap uid range missing or invalid\n"));
		DEBUG(0, ("winbindd: cannot continue, exiting.\n"));
		return False;
	}
	
	if (!lp_idmap_gid(&server_state.gid_low, &server_state.gid_high)) {
		DEBUG(0, ("winbindd: idmap gid range missing or invalid\n"));
		DEBUG(0, ("winbindd: cannot continue, exiting.\n"));
		return False;
	}
	
	return True;
}

/* Check if a domain is present in a comma-separated list of domains */

BOOL check_domain_env(char *domain_env, char *domain)
{
	fstring name;
	const char *tmp = domain_env;

	while(next_token(&tmp, name, ",", sizeof(fstring))) {
		if (strequal(name, domain))
			return True;
	}

	return False;
}

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

static BOOL assume_domain(const char *domain) {
	if ((lp_winbind_use_default_domain()  
		  || lp_winbind_trusted_domains_only()) &&
	    strequal(lp_workgroup(), domain)) 
		return True;

	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 {
			fstrcpy( domain, get_global_sam_name() ); 
		}
	} 
	else {
		fstrcpy(user, p+1);
		fstrcpy(domain, domuser);
		domain[PTR_DIFF(p, domuser)] = 0;
	}
	
	strupper_m(domain);
	
	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
	 
*/
void fill_domain_username(fstring name, const char *domain, const char *user)
{
        strlower_m(CONST_DISCARD(char *, user));

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

/* Demote a client to be the last in the list */

void winbindd_demote_client(struct winbindd_cli_state *cli)
{
	struct winbindd_cli_state *tmp;
	DLIST_DEMOTE(_client_list, cli, tmp);
}

/* 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;
}

/* Help with RID -> SID conversion */

DOM_SID *rid_to_talloced_sid(struct winbindd_domain *domain,
				    TALLOC_CTX *mem_ctx,
				    uint32 rid) 
{
	DOM_SID *sid;
	sid = TALLOC_P(mem_ctx, DOM_SID);
	if (!sid) {
		smb_panic("rid_to_to_talloced_sid: talloc for DOM_SID failed!\n");
	}
	sid_copy(sid, &domain->sid);
	sid_append_rid(sid, rid);
	return sid;
}
	
/*****************************************************************************
 For idmap conversion: convert one record to new format
 Ancient versions (eg 2.2.3a) of winbindd_idmap.tdb mapped DOMAINNAME/rid
 instead of the SID.
*****************************************************************************/
static int convert_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA data, void *state)
{
	struct winbindd_domain *domain;
	char *p;
	DOM_SID sid;
	uint32 rid;
	fstring keystr;
	fstring dom_name;
	TDB_DATA key2;
	BOOL *failed = (BOOL *)state;

	DEBUG(10,("Converting %s\n", key.dptr));

	p = strchr(key.dptr, '/');
	if (!p)
		return 0;

	*p = 0;
	fstrcpy(dom_name, key.dptr);
	*p++ = '/';

	domain = find_domain_from_name(dom_name);
	if (domain == NULL) {
		/* We must delete the old record. */
		DEBUG(0,("Unable to find domain %s\n", dom_name ));
		DEBUG(0,("deleting record %s\n", key.dptr ));

		if (tdb_delete(tdb, key) != 0) {
			DEBUG(0, ("Unable to delete record %s\n", key.dptr));
			*failed = True;
			return -1;
		}

		return 0;
	}

	rid = atoi(p);

	sid_copy(&sid, &domain->sid);
	sid_append_rid(&sid, rid);

	sid_to_string(keystr, &sid);
	key2.dptr = keystr;
	key2.dsize = strlen(keystr) + 1;

	if (tdb_store(tdb, key2, data, TDB_INSERT) != 0) {
		DEBUG(0,("Unable to add record %s\n", key2.dptr ));
		*failed = True;
		return -1;
	}

	if (tdb_store(tdb, data, key2, TDB_REPLACE) != 0) {
		DEBUG(0,("Unable to update record %s\n", data.dptr ));
		*failed = True;
		return -1;
	}

	if (tdb_delete(tdb, key) != 0) {
		DEBUG(0,("Unable to delete record %s\n", key.dptr ));
		*failed = True;
		return -1;
	}

	return 0;
}

/* These definitions are from sam/idmap_tdb.c. Replicated here just
   out of laziness.... :-( */

/* High water mark keys */
#define HWM_GROUP  "GROUP HWM"
#define HWM_USER   "USER HWM"

/* idmap version determines auto-conversion */
#define IDMAP_VERSION 2


/*****************************************************************************
 Convert the idmap database from an older version.
*****************************************************************************/

static BOOL idmap_convert(const char *idmap_name)
{
	int32 vers;
	BOOL bigendianheader;
	BOOL failed = False;
	TDB_CONTEXT *idmap_tdb;

	if (!(idmap_tdb = tdb_open_log(idmap_name, 0,
					TDB_DEFAULT, O_RDWR,
					0600))) {
		DEBUG(0, ("idmap_convert: Unable to open idmap database\n"));
		return False;
	}

	bigendianheader = (idmap_tdb->flags & TDB_BIGENDIAN) ? True : False;

	vers = tdb_fetch_int32(idmap_tdb, "IDMAP_VERSION");

	if (((vers == -1) && bigendianheader) || (IREV(vers) == IDMAP_VERSION)) {
		/* Arrggghh ! Bytereversed or old big-endian - make order independent ! */
		/*
		 * high and low records were created on a
		 * big endian machine and will need byte-reversing.
		 */

		int32 wm;

		wm = tdb_fetch_int32(idmap_tdb, HWM_USER);

		if (wm != -1) {
			wm = IREV(wm);
		}  else {
			wm = server_state.uid_low;
		}

		if (tdb_store_int32(idmap_tdb, HWM_USER, wm) == -1) {
			DEBUG(0, ("idmap_convert: Unable to byteswap user hwm in idmap database\n"));
			tdb_close(idmap_tdb);
			return False;
		}

		wm = tdb_fetch_int32(idmap_tdb, HWM_GROUP);
		if (wm != -1) {
			wm = IREV(wm);
		} else {
			wm = server_state.gid_low;
		}

		if (tdb_store_int32(idmap_tdb, HWM_GROUP, wm) == -1) {
			DEBUG(0, ("idmap_convert: Unable to byteswap group hwm in idmap database\n"));
			tdb_close(idmap_tdb);
			return False;
		}
	}

	/* the old format stored as DOMAIN/rid - now we store the SID direct */
	tdb_traverse(idmap_tdb, convert_fn, &failed);

	if (failed) {
		DEBUG(0, ("Problem during conversion\n"));
		tdb_close(idmap_tdb);
		return False;
	}

	if (tdb_store_int32(idmap_tdb, "IDMAP_VERSION", IDMAP_VERSION) == -1) {
		DEBUG(0, ("idmap_convert: Unable to dtore idmap version in databse\n"));
		tdb_close(idmap_tdb);
		return False;
	}

	tdb_close(idmap_tdb);
	return True;
}

/*****************************************************************************
 Convert the idmap database from an older version if necessary
*****************************************************************************/

BOOL winbindd_upgrade_idmap(void)
{
	pstring idmap_name;
	pstring backup_name;
	SMB_STRUCT_STAT stbuf;
	TDB_CONTEXT *idmap_tdb;

	pstrcpy(idmap_name, lock_path("winbindd_idmap.tdb"));

	if (!file_exist(idmap_name, &stbuf)) {
		/* nothing to convert return */
		return True;
	}

	if (!(idmap_tdb = tdb_open_log(idmap_name, 0,
					TDB_DEFAULT, O_RDWR,
					0600))) {
		DEBUG(0, ("idmap_convert: Unable to open idmap database\n"));
		return False;
	}

	if (tdb_fetch_int32(idmap_tdb, "IDMAP_VERSION") == IDMAP_VERSION) {
		/* nothing to convert return */
		tdb_close(idmap_tdb);
		return True;
	}

	/* backup_tdb expects the tdb not to be open */
	tdb_close(idmap_tdb);

	DEBUG(0, ("Upgrading winbindd_idmap.tdb from an old version\n"));

	pstrcpy(backup_name, idmap_name);
	pstrcat(backup_name, ".bak");

	if (backup_tdb(idmap_name, backup_name) != 0) {
		DEBUG(0, ("Could not backup idmap database\n"));
		return False;
	}

	return idmap_convert(idmap_name);
}

/*******************************************************************
 wrapper around retrieving the trust account password
*******************************************************************/

BOOL get_trust_pw(const char *domain, uint8 ret_pwd[16],
                          time_t *pass_last_set_time, uint32 *channel)
{
	DOM_SID sid;
	char *pwd;

	/* if we are a DC and this is not our domain, then lookup an account
	   for the domain trust */
	   
	if ( IS_DC && !strequal(domain, lp_workgroup()) && lp_allow_trusted_domains() ) 
	{
		if ( !secrets_fetch_trusted_domain_password(domain, &pwd, &sid, 
			pass_last_set_time) ) 
		{
			DEBUG(0, ("get_trust_pw: could not fetch trust account "
				  "password for trusted domain %s\n", domain));
			return False;
		}
		
		*channel = SEC_CHAN_DOMAIN;
		E_md4hash(pwd, ret_pwd);
		SAFE_FREE(pwd);

		return True;
	}
	else 	/* just get the account for our domain (covers 
		   ROLE_DOMAIN_MEMBER as well */
	{
		/* get the machine trust account for our domain */

		if ( !secrets_fetch_trust_account_password (lp_workgroup(), ret_pwd,
			pass_last_set_time, channel) ) 
		{
			DEBUG(0, ("get_trust_pw: could not fetch trust account "
				  "password for my domain %s\n", domain));
			return False;
		}
		
		return True;
	}
	
	/* Failure */
}