summaryrefslogtreecommitdiff
path: root/source3/passdb/lookup_sid.c
blob: 45a72057b6630faed8082d49a22251c4d1ad7c23 (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
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
/* 
   Unix SMB/CIFS implementation.
   uid/user handling
   Copyright (C) Andrew Tridgell         1992-1998
   Copyright (C) Gerald (Jerry) Carter   2003
   Copyright (C) Volker Lendecke	 2005
   
   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"

/*****************************************************************
 Dissect a user-provided name into domain, name, sid and type.

 If an explicit domain name was given in the form domain\user, it
 has to try that. If no explicit domain name was given, we have
 to do guesswork.
*****************************************************************/  

BOOL lookup_name(TALLOC_CTX *mem_ctx,
		 const char *full_name, int flags,
		 const char **ret_domain, const char **ret_name,
		 DOM_SID *ret_sid, enum lsa_SidType *ret_type)
{
	char *p;
	const char *tmp;
	const char *domain = NULL;
	const char *name = NULL;
	uint32 rid;
	DOM_SID sid;
	enum lsa_SidType type;
	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);

	if (tmp_ctx == NULL) {
		DEBUG(0, ("talloc_new failed\n"));
		return False;
	}

	p = strchr_m(full_name, '\\');

	if (p != NULL) {
		domain = talloc_strndup(tmp_ctx, full_name,
					PTR_DIFF(p, full_name));
		name = talloc_strdup(tmp_ctx, p+1);
	} else {
		domain = talloc_strdup(tmp_ctx, "");
		name = talloc_strdup(tmp_ctx, full_name);
	}

	DEBUG(10,("lookup_name: %s => %s (domain), %s (name)\n", 
		full_name, domain, name));

	if ((domain == NULL) || (name == NULL)) {
		DEBUG(0, ("talloc failed\n"));
		TALLOC_FREE(tmp_ctx);
		return False;
	}

	if (strequal(domain, get_global_sam_name())) {

		/* It's our own domain, lookup the name in passdb */
		if (lookup_global_sam_name(name, flags, &rid, &type)) {
			sid_copy(&sid, get_global_sam_sid());
			sid_append_rid(&sid, rid);
			goto ok;
		}
		TALLOC_FREE(tmp_ctx);
		return False;
	}

	if (strequal(domain, builtin_domain_name())) {

		/* Explicit request for a name in BUILTIN */
		if (lookup_builtin_name(name, &rid)) {
			sid_copy(&sid, &global_sid_Builtin);
			sid_append_rid(&sid, rid);
			type = SID_NAME_ALIAS;
			goto ok;
		}
		TALLOC_FREE(tmp_ctx);
		return False;
	}

	/* Try the explicit winbind lookup first, don't let it guess the
	 * domain yet at this point yet. This comes later. */

	if ((domain[0] != '\0') &&
	    (winbind_lookup_name(domain, name, &sid, &type))) {
			goto ok;
	}

	if (strequal(domain, unix_users_domain_name())) {
		if (lookup_unix_user_name(name, &sid)) {
			type = SID_NAME_USER;
			goto ok;
		}
		TALLOC_FREE(tmp_ctx);
		return False;
	}

	if (strequal(domain, unix_groups_domain_name())) {
		if (lookup_unix_group_name(name, &sid)) {
			type = SID_NAME_DOM_GRP;
			goto ok;
		}
		TALLOC_FREE(tmp_ctx);
		return False;
	}

	if ((domain[0] == '\0') && (!(flags & LOOKUP_NAME_ISOLATED))) {
		TALLOC_FREE(tmp_ctx);
		return False;
	}

	/* Now the guesswork begins, we haven't been given an explicit
	 * domain. Try the sequence as documented on
	 * http://msdn.microsoft.com/library/en-us/secmgmt/security/lsalookupnames.asp
	 * November 27, 2005 */

	/* 1. well-known names */

	if (lookup_wellknown_name(tmp_ctx, name, &sid, &domain)) {
		type = SID_NAME_WKN_GRP;
		goto ok;
	}

	/* 2. Builtin domain as such */

	if (strequal(name, builtin_domain_name())) {
		/* Swap domain and name */
		tmp = name; name = domain; domain = tmp;
		sid_copy(&sid, &global_sid_Builtin);
		type = SID_NAME_DOMAIN;
		goto ok;
	}

	/* 3. Account domain */

	if (strequal(name, get_global_sam_name())) {
		if (!secrets_fetch_domain_sid(name, &sid)) {
			DEBUG(3, ("Could not fetch my SID\n"));
			TALLOC_FREE(tmp_ctx);
			return False;
		}
		/* Swap domain and name */
		tmp = name; name = domain; domain = tmp;
		type = SID_NAME_DOMAIN;
		goto ok;
	}

	/* 4. Primary domain */

	if (!IS_DC && strequal(name, lp_workgroup())) {
		if (!secrets_fetch_domain_sid(name, &sid)) {
			DEBUG(3, ("Could not fetch the domain SID\n"));
			TALLOC_FREE(tmp_ctx);
			return False;
		}
		/* Swap domain and name */
		tmp = name; name = domain; domain = tmp;
		type = SID_NAME_DOMAIN;
		goto ok;
	}

	/* 5. Trusted domains as such, to me it looks as if members don't do
              this, tested an XP workstation in a NT domain -- vl */

	if (IS_DC && (secrets_fetch_trusted_domain_password(name, NULL,
							    &sid, NULL))) {
		/* Swap domain and name */
		tmp = name; name = domain; domain = tmp;
		type = SID_NAME_DOMAIN;
		goto ok;
	}

	/* 6. Builtin aliases */	

	if (lookup_builtin_name(name, &rid)) {
		domain = talloc_strdup(tmp_ctx, builtin_domain_name());
		sid_copy(&sid, &global_sid_Builtin);
		sid_append_rid(&sid, rid);
		type = SID_NAME_ALIAS;
		goto ok;
	}

	/* 7. Local systems' SAM (DCs don't have a local SAM) */
	/* 8. Primary SAM (On members, this is the domain) */

	/* Both cases are done by looking at our passdb */

	if (lookup_global_sam_name(name, flags, &rid, &type)) {
		domain = talloc_strdup(tmp_ctx, get_global_sam_name());
		sid_copy(&sid, get_global_sam_sid());
		sid_append_rid(&sid, rid);
		goto ok;
	}

	/* Now our local possibilities are exhausted. */

	if (!(flags & LOOKUP_NAME_REMOTE)) {
		TALLOC_FREE(tmp_ctx);
		return False;
	}

	/* If we are not a DC, we have to ask in our primary domain. Let
	 * winbind do that. */

	if (!IS_DC &&
	    (winbind_lookup_name(lp_workgroup(), name, &sid, &type))) {
		domain = talloc_strdup(tmp_ctx, lp_workgroup());
		goto ok;
	}

	/* 9. Trusted domains */

	/* If we're a DC we have to ask all trusted DC's. Winbind does not do
	 * that (yet), but give it a chance. */

	if (IS_DC && winbind_lookup_name("", name, &sid, &type)) {
		DOM_SID dom_sid;
		uint32 tmp_rid;
		enum lsa_SidType domain_type;
		
		if (type == SID_NAME_DOMAIN) {
			/* Swap name and type */
			tmp = name; name = domain; domain = tmp;
			goto ok;
		}

		/* Here we have to cope with a little deficiency in the
		 * winbind API: We have to ask it again for the name of the
		 * domain it figured out itself. Maybe fix that later... */

		sid_copy(&dom_sid, &sid);
		sid_split_rid(&dom_sid, &tmp_rid);

		if (!winbind_lookup_sid(tmp_ctx, &dom_sid, &domain, NULL,
					&domain_type) ||
		    (domain_type != SID_NAME_DOMAIN)) {
			DEBUG(2, ("winbind could not find the domain's name "
				  "it just looked up for us\n"));
			TALLOC_FREE(tmp_ctx);
			return False;
		}
		goto ok;
	}

	/* 10. Don't translate */

	/* 11. Ok, windows would end here. Samba has two more options:
               Unmapped users and unmapped groups */

	if (lookup_unix_user_name(name, &sid)) {
		domain = talloc_strdup(tmp_ctx, unix_users_domain_name());
		type = SID_NAME_USER;
		goto ok;
	}

	if (lookup_unix_group_name(name, &sid)) {
		domain = talloc_strdup(tmp_ctx, unix_groups_domain_name());
		type = SID_NAME_DOM_GRP;
		goto ok;
	}

	/*
	 * Ok, all possibilities tried. Fail.
	 */

	TALLOC_FREE(tmp_ctx);
	return False;

 ok:
	if ((domain == NULL) || (name == NULL)) {
		DEBUG(0, ("talloc failed\n"));
		TALLOC_FREE(tmp_ctx);
		return False;
	}

	/*
	 * Hand over the results to the talloc context we've been given.
	 */

	if ((ret_name != NULL) &&
	    !(*ret_name = talloc_strdup(mem_ctx, name))) {
		DEBUG(0, ("talloc failed\n"));
		TALLOC_FREE(tmp_ctx);
		return False;
	}

	if (ret_domain != NULL) {
		char *tmp_dom;
		if (!(tmp_dom = talloc_strdup(mem_ctx, domain))) {
			DEBUG(0, ("talloc failed\n"));
			TALLOC_FREE(tmp_ctx);
			return False;
		}
		strupper_m(tmp_dom);
		*ret_domain = tmp_dom;
	}

	if (ret_sid != NULL) {
		sid_copy(ret_sid, &sid);
	}

	if (ret_type != NULL) {
		*ret_type = type;
	}

	TALLOC_FREE(tmp_ctx);
	return True;
}

/************************************************************************
 Names from smb.conf can be unqualified. eg. valid users = foo
 These names should never map to a remote name. Try global_sam_name()\foo,
 and then "Unix Users"\foo (or "Unix Groups"\foo).
************************************************************************/

BOOL lookup_name_smbconf(TALLOC_CTX *mem_ctx,
		 const char *full_name, int flags,
		 const char **ret_domain, const char **ret_name,
		 DOM_SID *ret_sid, enum lsa_SidType *ret_type)
{
	char *qualified_name;
	const char *p;

	/* NB. No winbindd_separator here as lookup_name needs \\' */
	if ((p = strchr_m(full_name, *lp_winbind_separator())) != NULL) {

		/* The name is already qualified with a domain. */

		if (*lp_winbind_separator() != '\\') {
			char *tmp;

			/* lookup_name() needs '\\' as a separator */

			tmp = talloc_strdup(mem_ctx, full_name);
			if (!tmp) {
				return False;
			}
			tmp[p - full_name] = '\\';
			full_name = tmp;
		}

		return lookup_name(mem_ctx, full_name, flags,
				ret_domain, ret_name,
				ret_sid, ret_type);
	}

	/* Try with our own SAM name. */
	qualified_name = talloc_asprintf(mem_ctx, "%s\\%s",
				get_global_sam_name(),
				full_name );
	if (!qualified_name) {
		return False;
	}

	if (lookup_name(mem_ctx, qualified_name, flags,
				ret_domain, ret_name,
				ret_sid, ret_type)) {
		return True;
	}
	
	/* Finally try with "Unix Users" or "Unix Group" */
	qualified_name = talloc_asprintf(mem_ctx, "%s\\%s",
				flags & LOOKUP_NAME_GROUP ?
					unix_groups_domain_name() :
					unix_users_domain_name(),
				full_name );
	if (!qualified_name) {
		return False;
	}

	return lookup_name(mem_ctx, qualified_name, flags,
				ret_domain, ret_name,
				ret_sid, ret_type);
}

static BOOL wb_lookup_rids(TALLOC_CTX *mem_ctx,
			   const DOM_SID *domain_sid,
			   int num_rids, uint32 *rids,
			   const char **domain_name,
			   const char **names, enum lsa_SidType *types)
{
	int i;
	const char **my_names;
	enum lsa_SidType *my_types;
	TALLOC_CTX *tmp_ctx;

	if (!(tmp_ctx = talloc_init("wb_lookup_rids"))) {
		return False;
	}

	if (!winbind_lookup_rids(tmp_ctx, domain_sid, num_rids, rids,
				 domain_name, &my_names, &my_types)) {
		for (i=0; i<num_rids; i++) {
			types[i] = SID_NAME_UNKNOWN;
		}
		return True;
	}

	/*
	 * winbind_lookup_rids allocates its own array. We've been given the
	 * array, so copy it over
	 */

	for (i=0; i<num_rids; i++) {
		if (my_names[i] == NULL) {
			TALLOC_FREE(tmp_ctx);
			return False;
		}
		if (!(names[i] = talloc_strdup(names, my_names[i]))) {
			TALLOC_FREE(tmp_ctx);
			return False;
		}
		types[i] = my_types[i];
	}
	TALLOC_FREE(tmp_ctx);
	return True;
}

static BOOL lookup_rids(TALLOC_CTX *mem_ctx, const DOM_SID *domain_sid,
			int num_rids, uint32_t *rids,
			const char **domain_name,
			const char ***names, enum lsa_SidType **types)
{
	int i;

	*names = TALLOC_ARRAY(mem_ctx, const char *, num_rids);
	*types = TALLOC_ARRAY(mem_ctx, enum lsa_SidType, num_rids);

	if ((*names == NULL) || (*types == NULL)) {
		return False;
	}

	if (sid_check_is_domain(domain_sid)) {
		NTSTATUS result;

		if (*domain_name == NULL) {
			*domain_name = talloc_strdup(
				mem_ctx, get_global_sam_name());
		}

		if (*domain_name == NULL) {
			return False;
		}

		become_root_uid_only();
		result = pdb_lookup_rids(domain_sid, num_rids, rids,
					 *names, *types);
		unbecome_root_uid_only();

		return (NT_STATUS_IS_OK(result) ||
			NT_STATUS_EQUAL(result, NT_STATUS_NONE_MAPPED) ||
			NT_STATUS_EQUAL(result, STATUS_SOME_UNMAPPED));
	}

	if (sid_check_is_builtin(domain_sid)) {

		if (*domain_name == NULL) {
			*domain_name = talloc_strdup(
				mem_ctx, builtin_domain_name());
		}

		if (*domain_name == NULL) {
			return False;
		}

		for (i=0; i<num_rids; i++) {
			if (lookup_builtin_rid(*names, rids[i],
					       &(*names)[i])) {
				if ((*names)[i] == NULL) {
					return False;
				}
				(*types)[i] = SID_NAME_ALIAS;
			} else {
				(*types)[i] = SID_NAME_UNKNOWN;
			}
		}
		return True;
	}

	if (sid_check_is_wellknown_domain(domain_sid, NULL)) {
		for (i=0; i<num_rids; i++) {
			DOM_SID sid;
			sid_copy(&sid, domain_sid);
			sid_append_rid(&sid, rids[i]);
			if (lookup_wellknown_sid(mem_ctx, &sid,
						 domain_name, &(*names)[i])) {
				if ((*names)[i] == NULL) {
					return False;
				}
				(*types)[i] = SID_NAME_WKN_GRP;
			} else {
				(*types)[i] = SID_NAME_UNKNOWN;
			}
		}
		return True;
	}

	if (sid_check_is_unix_users(domain_sid)) {
		if (*domain_name == NULL) {
			*domain_name = talloc_strdup(
				mem_ctx, unix_users_domain_name());
		}
		for (i=0; i<num_rids; i++) {
			(*names)[i] = talloc_strdup(
				(*names), uidtoname(rids[i]));
			(*types)[i] = SID_NAME_USER;
		}
		return True;
	}

	if (sid_check_is_unix_groups(domain_sid)) {
		if (*domain_name == NULL) {
			*domain_name = talloc_strdup(
				mem_ctx, unix_groups_domain_name());
		}
		for (i=0; i<num_rids; i++) {
			(*names)[i] = talloc_strdup(
				(*names), gidtoname(rids[i]));
			(*types)[i] = SID_NAME_DOM_GRP;
		}
		return True;
	}

	return wb_lookup_rids(mem_ctx, domain_sid, num_rids, rids,
			      domain_name, *names, *types);
}

/*
 * Is the SID a domain as such? If yes, lookup its name.
 */

static BOOL lookup_as_domain(const DOM_SID *sid, TALLOC_CTX *mem_ctx,
			     const char **name)
{
	const char *tmp;
	enum lsa_SidType type;

	if (sid_check_is_domain(sid)) {
		*name = talloc_strdup(mem_ctx, get_global_sam_name());
		return True;
	}

	if (sid_check_is_builtin(sid)) {
		*name = talloc_strdup(mem_ctx, builtin_domain_name());
		return True;
	}

	if (sid_check_is_wellknown_domain(sid, &tmp)) {
		*name = talloc_strdup(mem_ctx, tmp);
		return True;
	}

	if (sid->num_auths != 4) {
		/* This can't be a domain */
		return False;
	}

	if (IS_DC) {
		uint32 i, num_domains;
		struct trustdom_info **domains;

		/* This is relatively expensive, but it happens only on DCs
		 * and for SIDs that have 4 sub-authorities and thus look like
		 * domains */

		if (!NT_STATUS_IS_OK(secrets_trusted_domains(mem_ctx,
							     &num_domains,
							     &domains))) {
			return False;
		}

		for (i=0; i<num_domains; i++) {
			if (sid_equal(sid, &domains[i]->sid)) {
				*name = talloc_strdup(mem_ctx,
						      domains[i]->name);
				return True;
			}
		}
		return False;
	}

	if (winbind_lookup_sid(mem_ctx, sid, &tmp, NULL, &type) &&
	    (type == SID_NAME_DOMAIN)) {
		*name = tmp;
		return True;
	}

	return False;
}

/*
 * This tries to implement the rather weird rules for the lsa_lookup level
 * parameter.
 *
 * This is as close as we can get to what W2k3 does. With this we survive the
 * RPC-LSALOOKUP samba4 test as of 2006-01-08. NT4 as a PDC is a bit more
 * different, but I assume that's just being too liberal. For example, W2k3
 * replies to everything else but the levels 1-6 with INVALID_PARAMETER
 * whereas NT4 does the same as level 1 (I think). I did not fully test that
 * with NT4, this is what w2k3 does.
 *
 * Level 1: Ask everywhere
 * Level 2: Ask domain and trusted domains, no builtin and wkn
 * Level 3: Only ask domain
 * Level 4: W2k3ad: Only ask AD trusts
 * Level 5: Don't lookup anything
 * Level 6: Like 4
 */

static BOOL check_dom_sid_to_level(const DOM_SID *sid, int level)
{
	int ret = False;

	switch(level) {
	case 1:
		ret = True;
		break;
	case 2:
		ret = (!sid_check_is_builtin(sid) &&
		       !sid_check_is_wellknown_domain(sid, NULL));
		break;
	case 3:
	case 4:
	case 6:
		ret = sid_check_is_domain(sid);
		break;
	case 5:
		ret = False;
		break;
	}

	DEBUG(10, ("%s SID %s in level %d\n",
		   ret ? "Accepting" : "Rejecting",
		   sid_string_static(sid), level));
	return ret;
}

/*
 * Lookup a bunch of SIDs. This is modeled after lsa_lookup_sids with
 * references to domains, it is explicitly made for this.
 *
 * This attempts to be as efficient as possible: It collects all SIDs
 * belonging to a domain and hands them in bulk to the appropriate lookup
 * function. In particular pdb_lookup_rids with ldapsam_trusted benefits
 * *hugely* from this. Winbind is going to be extended with a lookup_rids
 * interface as well, so on a DC we can do a bulk lsa_lookuprids to the
 * appropriate DC.
 */

NTSTATUS lookup_sids(TALLOC_CTX *mem_ctx, int num_sids,
		     const DOM_SID **sids, int level,
		     struct lsa_dom_info **ret_domains,
		     struct lsa_name_info **ret_names)
{
	TALLOC_CTX *tmp_ctx;
	NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
	struct lsa_name_info *name_infos;
	struct lsa_dom_info *dom_infos;

	int i, j;

	if (!(tmp_ctx = talloc_new(mem_ctx))) {
		DEBUG(0, ("talloc_new failed\n"));
		return NT_STATUS_NO_MEMORY;
	}

	name_infos = TALLOC_ARRAY(mem_ctx, struct lsa_name_info, num_sids);
	dom_infos = TALLOC_ZERO_ARRAY(mem_ctx, struct lsa_dom_info,
				      MAX_REF_DOMAINS);
	if ((name_infos == NULL) || (dom_infos == NULL)) {
		result = NT_STATUS_NO_MEMORY;
		goto fail;
	}

	/* First build up the data structures:
	 * 
	 * dom_infos is a list of domains referenced in the list of
	 * SIDs. Later we will walk the list of domains and look up the RIDs
	 * in bulk.
	 *
	 * name_infos is a shadow-copy of the SIDs array to collect the real
	 * data.
	 *
	 * dom_info->idxs is an index into the name_infos array. The
	 * difficulty we have here is that we need to keep the SIDs the client
	 * asked for in the same order for the reply
	 */

	for (i=0; i<num_sids; i++) {
		DOM_SID sid;
		uint32 rid;
		const char *domain_name = NULL;

		sid_copy(&sid, sids[i]);
		name_infos[i].type = SID_NAME_USE_NONE;

		if (lookup_as_domain(&sid, name_infos, &domain_name)) {
			/* We can't push that through the normal lookup
			 * process, as this would reference illegal
			 * domains.
			 *
			 * For example S-1-5-32 would end up referencing
			 * domain S-1-5- with RID 32 which is clearly wrong.
			 */
			if (domain_name == NULL) {
				result = NT_STATUS_NO_MEMORY;
				goto fail;
			}
				
			name_infos[i].rid = 0;
			name_infos[i].type = SID_NAME_DOMAIN;
			name_infos[i].name = NULL;

			if (sid_check_is_builtin(&sid)) {
				/* Yes, W2k3 returns "BUILTIN" both as domain
				 * and name here */
				name_infos[i].name = talloc_strdup(
					name_infos, builtin_domain_name());
				if (name_infos[i].name == NULL) {
					result = NT_STATUS_NO_MEMORY;
					goto fail;
				}
			}
		} else {
			/* This is a normal SID with rid component */
			if (!sid_split_rid(&sid, &rid)) {
				result = NT_STATUS_INVALID_PARAMETER;
				goto fail;
			}
		}

		if (!check_dom_sid_to_level(&sid, level)) {
			name_infos[i].rid = 0;
			name_infos[i].type = SID_NAME_UNKNOWN;
			name_infos[i].name = NULL;
			continue;
		}

		for (j=0; j<MAX_REF_DOMAINS; j++) {
			if (!dom_infos[j].valid) {
				break;
			}
			if (sid_equal(&sid, &dom_infos[j].sid)) {
				break;
			}
		}

		if (j == MAX_REF_DOMAINS) {
			/* TODO: What's the right error message here? */
			result = NT_STATUS_NONE_MAPPED;
			goto fail;
		}

		if (!dom_infos[j].valid) {
			/* We found a domain not yet referenced, create a new
			 * ref. */
			dom_infos[j].valid = True;
			sid_copy(&dom_infos[j].sid, &sid);

			if (domain_name != NULL) {
				/* This name was being found above in the case
				 * when we found a domain SID */
				dom_infos[j].name =
					talloc_strdup(dom_infos, domain_name);
				if (dom_infos[j].name == NULL) {
					result = NT_STATUS_NO_MEMORY;
					goto fail;
				}
			} else {
				/* lookup_rids will take care of this */
				dom_infos[j].name = NULL;
			}
		}

		name_infos[i].dom_idx = j;

		if (name_infos[i].type == SID_NAME_USE_NONE) {
			name_infos[i].rid = rid;

			ADD_TO_ARRAY(dom_infos, int, i, &dom_infos[j].idxs,
				     &dom_infos[j].num_idxs);

			if (dom_infos[j].idxs == NULL) {
				result = NT_STATUS_NO_MEMORY;
				goto fail;
			}
		}
	}

	/* Iterate over the domains found */

	for (i=0; i<MAX_REF_DOMAINS; i++) {
		uint32_t *rids;
		const char *domain_name = NULL;
		const char **names;
		enum lsa_SidType *types;
		struct lsa_dom_info *dom = &dom_infos[i];

		if (!dom->valid) {
			/* No domains left, we're done */
			break;
		}

		if (!(rids = TALLOC_ARRAY(tmp_ctx, uint32, dom->num_idxs))) {
			result = NT_STATUS_NO_MEMORY;
			goto fail;
		}

		for (j=0; j<dom->num_idxs; j++) {
			rids[j] = name_infos[dom->idxs[j]].rid;
		}

		if (!lookup_rids(tmp_ctx, &dom->sid,
				 dom->num_idxs, rids, &domain_name,
				 &names, &types)) {
			result = NT_STATUS_NO_MEMORY;
			goto fail;
		}

		if (!(dom->name = talloc_strdup(dom_infos, domain_name))) {
			result = NT_STATUS_NO_MEMORY;
			goto fail;
		}
			
		for (j=0; j<dom->num_idxs; j++) {
			int idx = dom->idxs[j];
			name_infos[idx].type = types[j];
			if (types[j] != SID_NAME_UNKNOWN) {
				name_infos[idx].name =
					talloc_strdup(name_infos, names[j]);
				if (name_infos[idx].name == NULL) {
					result = NT_STATUS_NO_MEMORY;
					goto fail;
				}
			} else {
				name_infos[idx].name = NULL;
			}
		}
	}

	*ret_domains = dom_infos;
	*ret_names = name_infos;
	return NT_STATUS_OK;

 fail:
	TALLOC_FREE(dom_infos);
	TALLOC_FREE(name_infos);
	TALLOC_FREE(tmp_ctx);
	return result;
}

/*****************************************************************
 *THE CANONICAL* convert SID to name function.
*****************************************************************/  

BOOL lookup_sid(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
		const char **ret_domain, const char **ret_name,
		enum lsa_SidType *ret_type)
{
	struct lsa_dom_info *domain;
	struct lsa_name_info *name;
	TALLOC_CTX *tmp_ctx;
	BOOL ret = False;

	if (!(tmp_ctx = talloc_new(mem_ctx))) {
		DEBUG(0, ("talloc_new failed\n"));
		return False;
	}

	if (!NT_STATUS_IS_OK(lookup_sids(tmp_ctx, 1, &sid, 1,
					 &domain, &name))) {
		goto done;
	}

	if (name->type == SID_NAME_UNKNOWN) {
		goto done;
	}

	if ((ret_domain != NULL) &&
	    !(*ret_domain = talloc_strdup(mem_ctx, domain->name))) {
		goto done;
	}

	if ((ret_name != NULL) && 
	    !(*ret_name = talloc_strdup(mem_ctx, name->name))) {
		goto done;
	}

	if (ret_type != NULL) {
		*ret_type = name->type;
	}

	ret = True;

 done:
	if (ret) {
		DEBUG(10, ("Sid %s -> %s\\%s(%d)\n",
			   sid_string_static(sid), domain->name,
			   name->name, name->type));
	} else {
		DEBUG(10, ("failed to lookup sid %s\n",
			   sid_string_static(sid)));
	}
	TALLOC_FREE(tmp_ctx);
	return ret;
}

/*****************************************************************
 Id mapping cache.  This is to avoid Winbind mappings already
 seen by smbd to be queried too frequently, keeping winbindd
 busy, and blocking smbd while winbindd is busy with other
 stuff. Written by Michael Steffens <michael.steffens@hp.com>,
 modified to use linked lists by jra.
*****************************************************************/  

#define MAX_UID_SID_CACHE_SIZE 100
#define TURNOVER_UID_SID_CACHE_SIZE 10
#define MAX_GID_SID_CACHE_SIZE 100
#define TURNOVER_GID_SID_CACHE_SIZE 10

static size_t n_uid_sid_cache = 0;
static size_t n_gid_sid_cache = 0;

static struct uid_sid_cache {
	struct uid_sid_cache *next, *prev;
	uid_t uid;
	DOM_SID sid;
	enum lsa_SidType sidtype;
} *uid_sid_cache_head;

static struct gid_sid_cache {
	struct gid_sid_cache *next, *prev;
	gid_t gid;
	DOM_SID sid;
	enum lsa_SidType sidtype;
} *gid_sid_cache_head;

/*****************************************************************
  Find a SID given a uid.
*****************************************************************/  

static BOOL fetch_sid_from_uid_cache(DOM_SID *psid, uid_t uid)
{
	struct uid_sid_cache *pc;

	for (pc = uid_sid_cache_head; pc; pc = pc->next) {
		if (pc->uid == uid) {
			*psid = pc->sid;
			DEBUG(3,("fetch sid from uid cache %u -> %s\n",
				 (unsigned int)uid, sid_string_static(psid)));
			DLIST_PROMOTE(uid_sid_cache_head, pc);
			return True;
		}
	}
	return False;
}

/*****************************************************************
  Find a uid given a SID.
*****************************************************************/  

static BOOL fetch_uid_from_cache( uid_t *puid, const DOM_SID *psid )
{
	struct uid_sid_cache *pc;

	for (pc = uid_sid_cache_head; pc; pc = pc->next) {
		if (sid_compare(&pc->sid, psid) == 0) {
			*puid = pc->uid;
			DEBUG(3,("fetch uid from cache %u -> %s\n",
				 (unsigned int)*puid, sid_string_static(psid)));
			DLIST_PROMOTE(uid_sid_cache_head, pc);
			return True;
		}
	}
	return False;
}

/*****************************************************************
 Store uid to SID mapping in cache.
*****************************************************************/  

void store_uid_sid_cache(const DOM_SID *psid, uid_t uid)
{
	struct uid_sid_cache *pc;

	/* do not store SIDs in the "Unix Group" domain */
	
	if ( sid_check_is_in_unix_users( psid ) )
		return;

	if (n_uid_sid_cache >= MAX_UID_SID_CACHE_SIZE && n_uid_sid_cache > TURNOVER_UID_SID_CACHE_SIZE) {
		/* Delete the last TURNOVER_UID_SID_CACHE_SIZE entries. */
		struct uid_sid_cache *pc_next;
		size_t i;

		for (i = 0, pc = uid_sid_cache_head; i < (n_uid_sid_cache - TURNOVER_UID_SID_CACHE_SIZE); i++, pc = pc->next)
			;
		for(; pc; pc = pc_next) {
			pc_next = pc->next;
			DLIST_REMOVE(uid_sid_cache_head,pc);
			SAFE_FREE(pc);
			n_uid_sid_cache--;
		}
	}

	pc = SMB_MALLOC_P(struct uid_sid_cache);
	if (!pc)
		return;
	pc->uid = uid;
	sid_copy(&pc->sid, psid);
	DLIST_ADD(uid_sid_cache_head, pc);
	n_uid_sid_cache++;
}

/*****************************************************************
  Find a SID given a gid.
*****************************************************************/  

static BOOL fetch_sid_from_gid_cache(DOM_SID *psid, gid_t gid)
{
	struct gid_sid_cache *pc;

	for (pc = gid_sid_cache_head; pc; pc = pc->next) {
		if (pc->gid == gid) {
			*psid = pc->sid;
			DEBUG(3,("fetch sid from gid cache %u -> %s\n",
				 (unsigned int)gid, sid_string_static(psid)));
			DLIST_PROMOTE(gid_sid_cache_head, pc);
			return True;
		}
	}
	return False;
}

/*****************************************************************
  Find a gid given a SID.
*****************************************************************/  

static BOOL fetch_gid_from_cache(gid_t *pgid, const DOM_SID *psid)
{
	struct gid_sid_cache *pc;

	for (pc = gid_sid_cache_head; pc; pc = pc->next) {
		if (sid_compare(&pc->sid, psid) == 0) {
			*pgid = pc->gid;
			DEBUG(3,("fetch gid from cache %u -> %s\n",
				 (unsigned int)*pgid, sid_string_static(psid)));
			DLIST_PROMOTE(gid_sid_cache_head, pc);
			return True;
		}
	}
	return False;
}

/*****************************************************************
 Store gid to SID mapping in cache.
*****************************************************************/  

void store_gid_sid_cache(const DOM_SID *psid, gid_t gid)
{
	struct gid_sid_cache *pc;
	
	/* do not store SIDs in the "Unix Group" domain */
	
	if ( sid_check_is_in_unix_groups( psid ) )
		return;

	if (n_gid_sid_cache >= MAX_GID_SID_CACHE_SIZE && n_gid_sid_cache > TURNOVER_GID_SID_CACHE_SIZE) {
		/* Delete the last TURNOVER_GID_SID_CACHE_SIZE entries. */
		struct gid_sid_cache *pc_next;
		size_t i;

		for (i = 0, pc = gid_sid_cache_head; i < (n_gid_sid_cache - TURNOVER_GID_SID_CACHE_SIZE); i++, pc = pc->next)
			;
		for(; pc; pc = pc_next) {
			pc_next = pc->next;
			DLIST_REMOVE(gid_sid_cache_head,pc);
			SAFE_FREE(pc);
			n_gid_sid_cache--;
		}
	}

	pc = SMB_MALLOC_P(struct gid_sid_cache);
	if (!pc)
		return;
	pc->gid = gid;
	sid_copy(&pc->sid, psid);
	DLIST_ADD(gid_sid_cache_head, pc);

	DEBUG(3,("store_gid_sid_cache: gid %u in cache -> %s\n", (unsigned int)gid,
		sid_string_static(psid)));

	n_gid_sid_cache++;
}

/*****************************************************************
 *THE CANONICAL* convert uid_t to SID function.
*****************************************************************/  

void uid_to_sid(DOM_SID *psid, uid_t uid)
{
	uid_t low, high;
	uint32 rid;
	BOOL ret;

	ZERO_STRUCTP(psid);

	if (fetch_sid_from_uid_cache(psid, uid))
		return;

	if ((lp_winbind_trusted_domains_only() ||
	     (lp_idmap_uid(&low, &high) && (uid >= low) && (uid <= high))) &&
	    winbind_uid_to_sid(psid, uid)) {

		DEBUG(10,("uid_to_sid: winbindd %u -> %s\n",
			  (unsigned int)uid, sid_string_static(psid)));
		goto done;
	}

	become_root_uid_only();
	ret = pdb_uid_to_rid(uid, &rid);
	unbecome_root_uid_only();

	if (ret) {
		/* This is a mapped user */
		sid_copy(psid, get_global_sam_sid());
		sid_append_rid(psid, rid);
		goto done;
	}

	/* This is an unmapped user */

	uid_to_unix_users_sid(uid, psid);

 done:
	DEBUG(10,("uid_to_sid: local %u -> %s\n", (unsigned int)uid,
		  sid_string_static(psid)));

	store_uid_sid_cache(psid, uid);
	return;
}

/*****************************************************************
 *THE CANONICAL* convert gid_t to SID function.
*****************************************************************/  

void gid_to_sid(DOM_SID *psid, gid_t gid)
{
	BOOL ret;
	gid_t low, high;

	ZERO_STRUCTP(psid);

	if (fetch_sid_from_gid_cache(psid, gid))
		return;

	if ((lp_winbind_trusted_domains_only() ||
	     (lp_idmap_gid(&low, &high) && (gid >= low) && (gid <= high))) &&
	    winbind_gid_to_sid(psid, gid)) {

		DEBUG(10,("gid_to_sid: winbindd %u -> %s\n",
			  (unsigned int)gid, sid_string_static(psid)));
		goto done;
	}

	become_root_uid_only();
	ret = pdb_gid_to_sid(gid, psid);
	unbecome_root_uid_only();

	if (ret) {
		/* This is a mapped group */
		goto done;
	}
	
	/* This is an unmapped group */

	gid_to_unix_groups_sid(gid, psid);

 done:
	DEBUG(10,("gid_to_sid: local %u -> %s\n", (unsigned int)gid,
		  sid_string_static(psid)));

	store_gid_sid_cache(psid, gid);
	return;
}

/*****************************************************************
 *THE CANONICAL* convert SID to uid function.
*****************************************************************/  

BOOL sid_to_uid(const DOM_SID *psid, uid_t *puid)
{
	enum lsa_SidType type;
	uint32 rid;
	gid_t gid;

	if (fetch_uid_from_cache(puid, psid))
		return True;

	if (fetch_gid_from_cache(&gid, psid)) {
		return False;
	}

	if (sid_peek_check_rid(&global_sid_Unix_Users, psid, &rid)) {
		uid_t uid = rid;
		*puid = uid;
		goto done;
	}

	if (sid_peek_check_rid(get_global_sam_sid(), psid, &rid)) {
		union unid_t id;
		BOOL ret;

		become_root_uid_only();
		ret = pdb_sid_to_id(psid, &id, &type);
		unbecome_root_uid_only();

		if (ret) {
			if (type != SID_NAME_USER) {
				DEBUG(5, ("sid %s is a %s, expected a user\n",
					  sid_string_static(psid),
					  sid_type_lookup(type)));
				return False;
			}
			*puid = id.uid;
			goto done;
		}

		/* This was ours, but it was not mapped.  Fail */

		return False;
	}

	if (winbind_lookup_sid(NULL, psid, NULL, NULL, &type)) {

		if (type != SID_NAME_USER) {
			DEBUG(10, ("sid_to_uid: sid %s is a %s\n",
				   sid_string_static(psid),
				   sid_type_lookup(type)));
			return False;
		}

		if (!winbind_sid_to_uid(puid, psid)) {
			DEBUG(5, ("sid_to_uid: winbind failed to allocate a "
				  "new uid for sid %s\n",
				  sid_string_static(psid)));
			return False;
		}
		goto done;
	}

	/* TODO: Here would be the place to allocate both a gid and a uid for
	 * the SID in question */

	return False;

 done:
	DEBUG(10,("sid_to_uid: %s -> %u\n", sid_string_static(psid),
		(unsigned int)*puid ));

	store_uid_sid_cache(psid, *puid);
	return True;
}

/*****************************************************************
 *THE CANONICAL* convert SID to gid function.
 Group mapping is used for gids that maps to Wellknown SIDs
*****************************************************************/  

BOOL sid_to_gid(const DOM_SID *psid, gid_t *pgid)
{
	uint32 rid;
	GROUP_MAP map;
	union unid_t id;
	enum lsa_SidType type;
	uid_t uid;

	if (fetch_gid_from_cache(pgid, psid))
		return True;

	if (fetch_uid_from_cache(&uid, psid))
		return False;

	if (sid_peek_check_rid(&global_sid_Unix_Groups, psid, &rid)) {
		gid_t gid = rid;
		*pgid = gid;
		goto done;
	}

	if ((sid_check_is_in_builtin(psid) ||
	     sid_check_is_in_wellknown_domain(psid))) {
		BOOL ret;

		become_root_uid_only();
		ret = pdb_getgrsid(&map, *psid);
		unbecome_root_uid_only();

		if (ret) {
			*pgid = map.gid;
			goto done;
		}
		return False;
	}

	if (sid_peek_check_rid(get_global_sam_sid(), psid, &rid)) {
		BOOL ret;

		become_root_uid_only();
		ret = pdb_sid_to_id(psid, &id, &type);
		unbecome_root_uid_only();

		if (ret) {
			if ((type != SID_NAME_DOM_GRP) &&
			    (type != SID_NAME_ALIAS)) {
				DEBUG(5, ("sid %s is a %s, expected a group\n",
					  sid_string_static(psid),
					  sid_type_lookup(type)));
				return False;
			}
			*pgid = id.gid;
			goto done;
		}

		/* This was ours, but it was not mapped.  Fail */

		return False;
	}
	
	if (!winbind_lookup_sid(NULL, psid, NULL, NULL, &type)) {
		DEBUG(11,("sid_to_gid: no one knows the SID %s (tried local, "
			  "then winbind)\n", sid_string_static(psid)));
		
		return False;
	}

	/* winbindd knows it; Ensure this is a group sid */

	if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
	    (type != SID_NAME_WKN_GRP)) {
		DEBUG(10,("sid_to_gid: winbind lookup succeeded but SID is "
			  "a %s\n", sid_type_lookup(type)));
		return False;
	}
	
	/* winbindd knows it and it is a type of group; sid_to_gid must succeed
	   or we are dead in the water */

	if ( !winbind_sid_to_gid(pgid, psid) ) {
		DEBUG(10,("sid_to_gid: winbind failed to allocate a new gid "
			  "for sid %s\n", sid_string_static(psid)));
		return False;
	}

 done:
	DEBUG(10,("sid_to_gid: %s -> %u\n", sid_string_static(psid),
		  (unsigned int)*pgid ));

	store_gid_sid_cache(psid, *pgid);
	
	return True;
}