summaryrefslogtreecommitdiff
path: root/source3/winbindd/winbindd_util.c
blob: e27c35fe60828cf285ffa18dd4aaa79f6842f753 (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
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
/*
   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 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 "winbindd.h"
#include "secrets.h"
#include "../libcli/security/security.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

extern struct winbindd_methods cache_methods;

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


/* 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 = NULL;

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

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

	return _domain_list;
}

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

static 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 struct 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 struct 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 struct dom_sid *sid)
{
	struct winbindd_domain *domain;
	const char *alternative_name = NULL;
	char *idmap_config_option;
	const char *param;
	const char **ignored_domains, **dom;

	ignored_domains = lp_parm_string_list(-1, "winbind", "ignore domains", NULL);
	for (dom=ignored_domains; dom && *dom; dom++) {
		if (gen_fnmatch(*dom, domain_name) == 0) {
			DEBUG(2,("Ignoring domain '%s'\n", domain_name));
			return 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))
		{
			break;
		}

		if (alternative_name && *alternative_name)
		{
			if (strequal(alternative_name, domain->name) ||
			    strequal(alternative_name, domain->alt_name))
			{
				break;
			}
		}

		if (sid)
		{
			if (is_null_sid(sid)) {
				continue;
			}

			if (dom_sid_equal(sid, &domain->sid)) {
				break;
			}
		}
	}

	if (domain != NULL) {
		/*
		 * We found a match. Possibly update the SID
		 */
		if ((sid != NULL)
		    && dom_sid_equal(&domain->sid, &global_sid_NULL)) {
			sid_copy( &domain->sid, sid );
		}
		return domain;
	}

	/* Create new domain entry */

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

	/* Fill in fields */

	ZERO_STRUCTP(domain);

	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;
	domain->dc_probe_pid = (pid_t)-1;
	if (sid) {
		sid_copy(&domain->sid, sid);
	}

	/* Link to domain list */
	DLIST_ADD_END(_domain_list, domain, struct winbindd_domain *);

	wcache_tdc_add_domain( domain );

	idmap_config_option = talloc_asprintf(talloc_tos(), "idmap config %s",
					      domain->name);
	if (idmap_config_option == NULL) {
		DEBUG(0, ("talloc failed, not looking for idmap config\n"));
		goto done;
	}

	param = lp_parm_const_string(-1, idmap_config_option, "range", NULL);

	DEBUG(10, ("%s : range = %s\n", idmap_config_option,
		   param ? param : "not defined"));

	if (param != NULL) {
		unsigned low_id, high_id;
		if (sscanf(param, "%u - %u", &low_id, &high_id) != 2) {
			DEBUG(1, ("invalid range syntax in %s: %s\n",
				  idmap_config_option, param));
			goto done;
		}
		if (low_id > high_id) {
			DEBUG(1, ("invalid range in %s: %s\n",
				  idmap_config_option, param));
			goto done;
		}
		domain->have_idmap_config = true;
		domain->id_range_low = low_id;
		domain->id_range_high = high_id;
	}

done:

	DEBUG(2,("Added domain %s %s %s\n",
		 domain->name, domain->alt_name,
		 &domain->sid?sid_string_dbg(&domain->sid):""));

	return domain;
}

bool domain_is_forest_root(const struct winbindd_domain *domain)
{
	const uint32_t fr_flags =
		(NETR_TRUST_FLAG_TREEROOT|NETR_TRUST_FLAG_IN_FOREST);

	return ((domain->domain_flags & fr_flags) == fr_flags);
}

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

struct trustdom_state {
	struct winbindd_domain *domain;
	struct winbindd_request request;
};

static void trustdom_list_done(struct tevent_req *req);
static void rescan_forest_root_trusts( void );
static void rescan_forest_trusts( void );

static void add_trusted_domains( struct winbindd_domain *domain )
{
	struct trustdom_state *state;
	struct tevent_req *req;

	state = TALLOC_ZERO_P(NULL, struct trustdom_state);
	if (state == NULL) {
		DEBUG(0, ("talloc failed\n"));
		return;
	}
	state->domain = domain;

	state->request.length = sizeof(state->request);
	state->request.cmd = WINBINDD_LIST_TRUSTDOM;

	req = wb_domain_request_send(state, winbind_event_context(),
				     domain, &state->request);
	if (req == NULL) {
		DEBUG(1, ("wb_domain_request_send failed\n"));
		TALLOC_FREE(state);
		return;
	}
	tevent_req_set_callback(req, trustdom_list_done, state);
}

static void trustdom_list_done(struct tevent_req *req)
{
	struct trustdom_state *state = tevent_req_callback_data(
		req, struct trustdom_state);
	struct winbindd_response *response;
	int res, err;
	char *p;

	res = wb_domain_request_recv(req, state, &response, &err);
	if ((res == -1) || (response->result != WINBINDD_OK)) {
		DEBUG(1, ("Could not receive trustdoms\n"));
		TALLOC_FREE(state);
		return;
	}

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

	while ((p != NULL) && (*p != '\0')) {
		char *q, *sidstr, *alt_name;
		struct dom_sid sid;
		struct winbindd_domain *domain;
		char *alternate_name = NULL;

		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)) {
			DEBUG(0, ("Got invalid trustdom response\n"));
			break;
		}

		/* use the real alt_name if we have one, else pass in NULL */

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

		/* If we have an existing domain structure, calling
 		   add_trusted_domain() will update the SID if
 		   necessary.  This is important because we need the
 		   SID for sibling domains */

		if ( find_domain_from_name_noinit(p) != NULL ) {
			domain = add_trusted_domain(p, alternate_name,
						    &cache_methods,
						    &sid);
		} else {
			domain = add_trusted_domain(p, alternate_name,
						    &cache_methods,
						    &sid);
			if (domain) {
				setup_domain_child(domain);
			}
		}
		p=q;
		if (p != NULL)
			p += 1;
	}

	/*
	   Cases to consider when scanning trusts:
	   (a) we are calling from a child domain (primary && !forest_root)
	   (b) we are calling from the root of the forest (primary && forest_root)
	   (c) we are calling from a trusted forest domain (!primary
	       && !forest_root)
	*/

	if (state->domain->primary) {
		/* If this is our primary domain and we are not in the
		   forest root, we have to scan the root trusts first */

		if (!domain_is_forest_root(state->domain))
			rescan_forest_root_trusts();
		else
			rescan_forest_trusts();

	} else if (domain_is_forest_root(state->domain)) {
		/* Once we have done root forest trust search, we can
		   go on to search the trusted forests */

		rescan_forest_trusts();
	}

	TALLOC_FREE(state);

	return;
}

/********************************************************************
 Scan the trusts of our forest root
********************************************************************/

static void rescan_forest_root_trusts( void )
{
	struct winbindd_tdc_domain *dom_list = NULL;
        size_t num_trusts = 0;
	int i;

	/* The only transitive trusts supported by Windows 2003 AD are
	   (a) Parent-Child, (b) Tree-Root, and (c) Forest.   The
	   first two are handled in forest and listed by
	   DsEnumerateDomainTrusts().  Forest trusts are not so we
	   have to do that ourselves. */

	if ( !wcache_tdc_fetch_list( &dom_list, &num_trusts ) )
		return;

	for ( i=0; i<num_trusts; i++ ) {
		struct winbindd_domain *d = NULL;

		/* Find the forest root.  Don't necessarily trust
		   the domain_list() as our primary domain may not
		   have been initialized. */

		if ( !(dom_list[i].trust_flags & NETR_TRUST_FLAG_TREEROOT) ) {
			continue;
		}

		/* Here's the forest root */

		d = find_domain_from_name_noinit( dom_list[i].domain_name );

		if ( !d ) {
			d = add_trusted_domain( dom_list[i].domain_name,
						dom_list[i].dns_name,
						&cache_methods,
						&dom_list[i].sid );
			if (d != NULL) {
				setup_domain_child(d);
			}
		}

		if (d == NULL) {
			continue;
		}

       		DEBUG(10,("rescan_forest_root_trusts: Following trust path "
			  "for domain tree root %s (%s)\n",
	       		  d->name, d->alt_name ));

		d->domain_flags = dom_list[i].trust_flags;
		d->domain_type  = dom_list[i].trust_type;
		d->domain_trust_attribs = dom_list[i].trust_attribs;

		add_trusted_domains( d );

		break;
	}

	TALLOC_FREE( dom_list );

	return;
}

/********************************************************************
 scan the transitive forest trusts (not our own)
********************************************************************/


static void rescan_forest_trusts( void )
{
	struct winbindd_domain *d = NULL;
	struct winbindd_tdc_domain *dom_list = NULL;
        size_t num_trusts = 0;
	int i;

	/* The only transitive trusts supported by Windows 2003 AD are
	   (a) Parent-Child, (b) Tree-Root, and (c) Forest.   The
	   first two are handled in forest and listed by
	   DsEnumerateDomainTrusts().  Forest trusts are not so we
	   have to do that ourselves. */

	if ( !wcache_tdc_fetch_list( &dom_list, &num_trusts ) )
		return;

	for ( i=0; i<num_trusts; i++ ) {
		uint32 flags   = dom_list[i].trust_flags;
		uint32 type    = dom_list[i].trust_type;
		uint32 attribs = dom_list[i].trust_attribs;

		d = find_domain_from_name_noinit( dom_list[i].domain_name );

		/* ignore our primary and internal domains */

		if ( d && (d->internal || d->primary ) )
			continue;

		if ( (flags & NETR_TRUST_FLAG_INBOUND) &&
		     (type == NETR_TRUST_TYPE_UPLEVEL) &&
		     (attribs == NETR_TRUST_ATTRIBUTE_FOREST_TRANSITIVE) )
		{
			/* add the trusted domain if we don't know
			   about it */

			if ( !d ) {
				d = add_trusted_domain( dom_list[i].domain_name,
							dom_list[i].dns_name,
							&cache_methods,
							&dom_list[i].sid );
				if (d != NULL) {
					setup_domain_child(d);
				}
			}

			if (d == NULL) {
				continue;
			}

			DEBUG(10,("Following trust path for domain %s (%s)\n",
				  d->name, d->alt_name ));
			add_trusted_domains( d );
		}
	}

	TALLOC_FREE( dom_list );

	return;
}

/*********************************************************************
 The process of updating the trusted domain list is a three step
 async process:
 (a) ask our domain
 (b) ask the root domain in our forest
 (c) ask the a DC in any Win2003 trusted forests
*********************************************************************/

void rescan_trusted_domains(struct tevent_context *ev, struct tevent_timer *te,
			    struct timeval now, void *private_data)
{
	TALLOC_FREE(te);

	/* I use to clear the cache here and start over but that
	   caused problems in child processes that needed the
	   trust dom list early on.  Removing it means we
	   could have some trusted domains listed that have been
	   removed from our primary domain's DC until a full
	   restart.  This should be ok since I think this is what
	   Windows does as well. */

	/* this will only add new domains we didn't already know about
	   in the domain_list()*/

	add_trusted_domains( find_our_domain() );

	te = tevent_add_timer(
		ev, NULL, timeval_current_ofs(WINBINDD_RESCAN_FREQ, 0),
		rescan_trusted_domains, NULL);
	/*
	 * If te == NULL, there's not much we can do here. Don't fail, the
	 * only thing we miss is new trusted domains.
	 */

	return;
}

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);
	}

	if (domain->internal) {
		domain->initialized = true;
	} else {
		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);
	sid_to_fstring(state->response->data.domain_info.sid, &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;

	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();

	/* BUILTIN domain */

	domain = add_trusted_domain("BUILTIN", NULL, &cache_methods,
				    &global_sid_Builtin);
	if (domain) {
		setup_domain_child(domain);
	}

	/* Local SAM */

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

	/* Add ourselves as the first entry. */

	if ( role == ROLE_DOMAIN_MEMBER ) {
		struct 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);
		if (domain) {
			domain->primary = True;
			setup_domain_child(domain);

			/* 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);
		}
	}

	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 struct dom_sid *sid)
{
	struct winbindd_domain *domain;

	/* Search through list */

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

struct winbindd_domain *find_root_domain(void)
{
	struct winbindd_domain *ours = find_our_domain();

	if (ours->forest_name[0] == '\0') {
		return NULL;
	}

	return find_domain_from_name( ours->forest_name );
}

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

	domain = find_domain_from_sid(&global_sid_Builtin);
	if (domain == NULL) {
		smb_panic("Could not find BUILTIN domain");
	}

	return domain;
}

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

struct winbindd_domain *find_lookup_domain_from_sid(const struct dom_sid *sid)
{
	/* SIDs in the S-1-22-{1,2} domain should be handled by our passdb */

	if ( sid_check_is_in_unix_groups(sid) ||
	     sid_check_is_unix_groups(sid) ||
	     sid_check_is_in_unix_users(sid) ||
	     sid_check_is_unix_users(sid) )
	{
		return find_domain_from_sid(get_global_sam_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_dbg(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 ( strequal(domain_name, unix_users_domain_name() ) ||
	     strequal(domain_name, unix_groups_domain_name() ) )
	{
		/*
		 * The "Unix User" and "Unix Group" domain our handled by
		 * passdb
		 */
		return find_domain_from_name_noinit( get_global_sam_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();
}

/* 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 if ((p = strchr(domuser, '@')) != NULL) {
			fstrcpy(domain, p + 1);
			user[PTR_DIFF(p, domuser)] = 0;
		} 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));
}

/* add a domain user name to a buffer */
void parse_add_domuser(void *buf, char *domuser, int *len)
{
	fstring domain;
	char *p, *user;

	user = domuser;
	p = strchr(domuser, *lp_winbind_separator());

	if (p) {

		fstrcpy(domain, domuser);
		domain[PTR_DIFF(p, domuser)] = 0;
		p++;

		if (assume_domain(domain)) {

			user = p;
			*len -= (PTR_DIFF(p, domuser));
		}
	}

	safe_strcpy((char *)buf, user, *len);
}

/* 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);
	}
}

/**
 * talloc version of fill_domain_username()
 * return NULL on talloc failure.
 */
char *fill_domain_username_talloc(TALLOC_CTX *mem_ctx,
				  const char *domain,
				  const char *user,
				  bool can_assume)
{
	char *tmp_user, *name;

	tmp_user = talloc_strdup(mem_ctx, user);
	strlower_m(tmp_user);

	if (can_assume && assume_domain(domain)) {
		name = tmp_user;
	} else {
		name = talloc_asprintf(mem_ctx, "%s%c%s",
				       domain,
				       *lp_winbind_separator(),
				       tmp_user);
		TALLOC_FREE(tmp_user);
	}

	return name;
}

/*
 * 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--;
}

/* 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 struct dom_sid *user_sid,
				  uint32_t *p_num_groups, struct dom_sid **user_sids)
{
	struct netr_SamInfo3 *info3 = NULL;
	NTSTATUS status = NT_STATUS_NO_MEMORY;
	uint32_t num_groups = 0;

	DEBUG(3,(": lookup_usergroups_cached\n"));

	*user_sids = NULL;
	*p_num_groups = 0;

	info3 = netsamlogon_cache_get(mem_ctx, user_sid);

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

	if (info3->base.groups.count == 0) {
		TALLOC_FREE(info3);
		return NT_STATUS_UNSUCCESSFUL;
	}

	/* Skip Domain local groups outside our domain.
	   We'll get these from the getsidaliases() RPC call. */
	status = sid_array_from_info3(mem_ctx, info3,
				      user_sids,
				      &num_groups,
				      false, true);

	if (!NT_STATUS_IS_OK(status)) {
		TALLOC_FREE(info3);
		return status;
	}

	TALLOC_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;
}

/*********************************************************************
 We use this to remove spaces from user and group names
********************************************************************/

NTSTATUS normalize_name_map(TALLOC_CTX *mem_ctx,
			     struct winbindd_domain *domain,
			     const char *name,
			     char **normalized)
{
	NTSTATUS nt_status;

	if (!name || !normalized) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	if (!lp_winbind_normalize_names()) {
		return NT_STATUS_PROCEDURE_NOT_FOUND;
	}

	/* Alias support and whitespace replacement are mutually
	   exclusive */

	nt_status = resolve_username_to_alias(mem_ctx, domain,
					      name, normalized );
	if (NT_STATUS_IS_OK(nt_status)) {
		/* special return code to let the caller know we
		   mapped to an alias */
		return NT_STATUS_FILE_RENAMED;
	}

	/* check for an unreachable domain */

	if (NT_STATUS_EQUAL(nt_status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND)) {
		DEBUG(5,("normalize_name_map: Setting domain %s offline\n",
			 domain->name));
		set_domain_offline(domain);
		return nt_status;
	}

	/* deal with whitespace */

	*normalized = talloc_strdup(mem_ctx, name);
	if (!(*normalized)) {
		return NT_STATUS_NO_MEMORY;
	}

	all_string_sub( *normalized, " ", "_", 0 );

	return NT_STATUS_OK;
}

/*********************************************************************
 We use this to do the inverse of normalize_name_map()
********************************************************************/

NTSTATUS normalize_name_unmap(TALLOC_CTX *mem_ctx,
			      char *name,
			      char **normalized)
{
	NTSTATUS nt_status;
	struct winbindd_domain *domain = find_our_domain();

	if (!name || !normalized) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	if (!lp_winbind_normalize_names()) {
		return NT_STATUS_PROCEDURE_NOT_FOUND;
	}

	/* Alias support and whitespace replacement are mutally
	   exclusive */

	/* When mapping from an alias to a username, we don't know the
	   domain.  But we only need a domain structure to cache
	   a successful lookup , so just our own domain structure for
	   the seqnum. */

	nt_status = resolve_alias_to_username(mem_ctx, domain,
					      name, normalized);
	if (NT_STATUS_IS_OK(nt_status)) {
		/* Special return code to let the caller know we mapped
		   from an alias */
		return NT_STATUS_FILE_RENAMED;
	}

	/* check for an unreachable domain */

	if (NT_STATUS_EQUAL(nt_status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND)) {
		DEBUG(5,("normalize_name_unmap: Setting domain %s offline\n",
			 domain->name));
		set_domain_offline(domain);
		return nt_status;
	}

	/* deal with whitespace */

	*normalized = talloc_strdup(mem_ctx, name);
	if (!(*normalized)) {
		return NT_STATUS_NO_MEMORY;
	}

	all_string_sub(*normalized, "_", " ", 0);

	return NT_STATUS_OK;
}

/*********************************************************************
 ********************************************************************/

bool winbindd_can_contact_domain(struct winbindd_domain *domain)
{
	struct winbindd_tdc_domain *tdc = NULL;
	TALLOC_CTX *frame = talloc_stackframe();
	bool ret = false;

	/* We can contact the domain if it is our primary domain */

	if (domain->primary) {
		return true;
	}

	/* Trust the TDC cache and not the winbindd_domain flags */

	if ((tdc = wcache_tdc_fetch_domain(frame, domain->name)) == NULL) {
		DEBUG(10,("winbindd_can_contact_domain: %s not found in cache\n",
			  domain->name));
		return false;
	}

	/* Can always contact a domain that is in out forest */

	if (tdc->trust_flags & NETR_TRUST_FLAG_IN_FOREST) {
		ret = true;
		goto done;
	}

	/*
	 * On a _member_ server, we cannot contact the domain if it
	 * is running AD and we have no inbound trust.
	 */

	if (!IS_DC &&
	     domain->active_directory &&
	    ((tdc->trust_flags & NETR_TRUST_FLAG_INBOUND) != NETR_TRUST_FLAG_INBOUND))
	{
		DEBUG(10, ("winbindd_can_contact_domain: %s is an AD domain "
			   "and we have no inbound trust.\n", domain->name));
		goto done;
	}

	/* Assume everything else is ok (probably not true but what
	   can you do?) */

	ret = true;

done:
	talloc_destroy(frame);

	return ret;
}

/*********************************************************************
 ********************************************************************/

bool winbindd_internal_child(struct winbindd_child *child)
{
	if ((child == idmap_child()) || (child == locator_child())) {
		return True;
	}

	return False;
}

#ifdef HAVE_KRB5_LOCATE_PLUGIN_H

/*********************************************************************
 ********************************************************************/

static void winbindd_set_locator_kdc_env(const struct winbindd_domain *domain)
{
	char *var = NULL;
	char addr[INET6_ADDRSTRLEN];
	const char *kdc = NULL;
	int lvl = 11;

	if (!domain || !domain->alt_name || !*domain->alt_name) {
		return;
	}

	if (domain->initialized && !domain->active_directory) {
		DEBUG(lvl,("winbindd_set_locator_kdc_env: %s not AD\n",
			domain->alt_name));
		return;
	}

	print_sockaddr(addr, sizeof(addr), &domain->dcaddr);
	kdc = addr;
	if (!*kdc) {
		DEBUG(lvl,("winbindd_set_locator_kdc_env: %s no DC IP\n",
			domain->alt_name));
		kdc = domain->dcname;
	}

	if (!kdc || !*kdc) {
		DEBUG(lvl,("winbindd_set_locator_kdc_env: %s no DC at all\n",
			domain->alt_name));
		return;
	}

	if (asprintf_strupper_m(&var, "%s_%s", WINBINDD_LOCATOR_KDC_ADDRESS,
				domain->alt_name) == -1) {
		return;
	}

	DEBUG(lvl,("winbindd_set_locator_kdc_env: setting var: %s to: %s\n",
		var, kdc));

	setenv(var, kdc, 1);
	free(var);
}

/*********************************************************************
 ********************************************************************/

void winbindd_set_locator_kdc_envs(const struct winbindd_domain *domain)
{
	struct winbindd_domain *our_dom = find_our_domain();

	winbindd_set_locator_kdc_env(domain);

	if (domain != our_dom) {
		winbindd_set_locator_kdc_env(our_dom);
	}
}

/*********************************************************************
 ********************************************************************/

void winbindd_unset_locator_kdc_env(const struct winbindd_domain *domain)
{
	char *var = NULL;

	if (!domain || !domain->alt_name || !*domain->alt_name) {
		return;
	}

	if (asprintf_strupper_m(&var, "%s_%s", WINBINDD_LOCATOR_KDC_ADDRESS,
				domain->alt_name) == -1) {
		return;
	}

	unsetenv(var);
	free(var);
}
#else

void winbindd_set_locator_kdc_envs(const struct winbindd_domain *domain)
{
	return;
}

void winbindd_unset_locator_kdc_env(const struct winbindd_domain *domain)
{
	return;
}

#endif /* HAVE_KRB5_LOCATE_PLUGIN_H */

void set_auth_errors(struct winbindd_response *resp, NTSTATUS result)
{
	resp->data.auth.nt_status = NT_STATUS_V(result);
	fstrcpy(resp->data.auth.nt_status_string, nt_errstr(result));

	/* we might have given a more useful error above */
	if (*resp->data.auth.error_string == '\0')
		fstrcpy(resp->data.auth.error_string,
			get_friendly_nt_error_msg(result));
	resp->data.auth.pam_error = nt_status_to_pam(result);
}

bool is_domain_offline(const struct winbindd_domain *domain)
{
	if (!lp_winbind_offline_logon()) {
		return false;
	}
	if (get_global_winbindd_state_offline()) {
		return true;
	}
	return !domain->online;
}