summaryrefslogtreecommitdiff
path: root/source4/dsdb/samdb/ldb_modules/samldb.c
blob: e7e84b2e3b82151d9f869936fbb97f40eadc4c5b (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
/*
   SAM ldb module

   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   Copyright (C) Simo Sorce  2004-2008
   Copyright (C) Matthias Dieter Wallnöfer 2009-2010

   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/>.
*/

/*
 *  Name: ldb
 *
 *  Component: ldb samldb module
 *
 *  Description: add embedded user/group creation functionality
 *
 *  Author: Simo Sorce
 */

#include "includes.h"
#include "libcli/ldap/ldap_ndr.h"
#include "ldb_module.h"
#include "dsdb/samdb/samdb.h"
#include "dsdb/samdb/ldb_modules/util.h"
#include "libcli/security/security.h"
#include "librpc/gen_ndr/ndr_security.h"
#include "../lib/util/util_ldb.h"
#include "ldb_wrap.h"
#include "param/param.h"

struct samldb_ctx;

typedef int (*samldb_step_fn_t)(struct samldb_ctx *);

struct samldb_step {
	struct samldb_step *next;
	samldb_step_fn_t fn;
};

struct samldb_ctx {
	struct ldb_module *module;
	struct ldb_request *req;

	/* used for add operations */
	const char *type;

	/* the resulting message */
	struct ldb_message *msg;

	/* used in "samldb_find_for_defaultObjectCategory" */
	struct ldb_dn *dn, *res_dn;

	/* all the async steps necessary to complete the operation */
	struct samldb_step *steps;
	struct samldb_step *curstep;

	/* If someone set an ares to forward controls and response back to the caller */
	struct ldb_reply *ares;
};

static struct samldb_ctx *samldb_ctx_init(struct ldb_module *module,
					  struct ldb_request *req)
{
	struct ldb_context *ldb;
	struct samldb_ctx *ac;

	ldb = ldb_module_get_ctx(module);

	ac = talloc_zero(req, struct samldb_ctx);
	if (ac == NULL) {
		ldb_oom(ldb);
		return NULL;
	}

	ac->module = module;
	ac->req = req;

	return ac;
}

static int samldb_add_step(struct samldb_ctx *ac, samldb_step_fn_t fn)
{
	struct samldb_step *step, *stepper;

	step = talloc_zero(ac, struct samldb_step);
	if (step == NULL) {
		return ldb_oom(ldb_module_get_ctx(ac->module));
	}

	step->fn = fn;

	if (ac->steps == NULL) {
		ac->steps = step;
		ac->curstep = step;
	} else {
		if (ac->curstep == NULL)
			return ldb_operr(ldb_module_get_ctx(ac->module));
		for (stepper = ac->curstep; stepper->next != NULL;
			stepper = stepper->next);
		stepper->next = step;
	}

	return LDB_SUCCESS;
}

static int samldb_first_step(struct samldb_ctx *ac)
{
	if (ac->steps == NULL) {
		return ldb_operr(ldb_module_get_ctx(ac->module));
	}

	ac->curstep = ac->steps;
	return ac->curstep->fn(ac);
}

static int samldb_next_step(struct samldb_ctx *ac)
{
	if (ac->curstep->next) {
		ac->curstep = ac->curstep->next;
		return ac->curstep->fn(ac);
	}

	/* we exit the samldb module here */
	/* If someone set an ares to forward controls and response back to the caller, use them */
	if (ac->ares) {
		return ldb_module_done(ac->req, ac->ares->controls,
				       ac->ares->response, LDB_SUCCESS);
	} else {
		return ldb_module_done(ac->req, NULL, NULL, LDB_SUCCESS);
	}
}


/* sAMAccountName handling */

static int samldb_generate_sAMAccountName(struct ldb_context *ldb, struct ldb_message *msg)
{
	char *name;

	/* Format: $000000-000000000000 */

	name = talloc_asprintf(msg, "$%.6X-%.6X%.6X",
				(unsigned int)generate_random(),
				(unsigned int)generate_random(),
				(unsigned int)generate_random());
	if (name == NULL) {
		return ldb_oom(ldb);
	}
	return ldb_msg_add_steal_string(msg, "sAMAccountName", name);
}

static int samldb_check_sAMAccountName(struct samldb_ctx *ac)
{
	struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
	const char *name;
        int ret;

        if (ldb_msg_find_element(ac->msg, "sAMAccountName") == NULL) {
                ret = samldb_generate_sAMAccountName(ldb, ac->msg);
                if (ret != LDB_SUCCESS) {
                        return ret;
                }
        }

	name = ldb_msg_find_attr_as_string(ac->msg, "sAMAccountName", NULL);
	if (name == NULL) {
		return ldb_operr(ldb);
	}

	ret = samdb_search_count(ldb, NULL, "(sAMAccountName=%s)",
				 ldb_binary_encode_string(ac, name));
	if ((ret < 0) || (ret > 1)) {
		return ldb_operr(ldb);
	}
	if (ret == 1) {
		return LDB_ERR_ENTRY_ALREADY_EXISTS;
	}

	return samldb_next_step(ac);
}

/* sAMAccountType handling */

static int samldb_check_sAMAccountType(struct samldb_ctx *ac)
{
	struct ldb_context *ldb;
	unsigned int account_type;
	unsigned int group_type;
	unsigned int uac;
	int ret;

	ldb = ldb_module_get_ctx(ac->module);

	/* make sure sAMAccountType is not specified */
	if (ldb_msg_find_element(ac->msg, "sAMAccountType") != NULL) {
		ldb_asprintf_errstring(ldb,
			"sAMAccountType must not be specified!");
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	if (strcmp("user", ac->type) == 0) {
		uac = samdb_result_uint(ac->msg, "userAccountControl", 0);
		if (uac == 0) {
			ldb_asprintf_errstring(ldb,
				"userAccountControl invalid!");
			return LDB_ERR_UNWILLING_TO_PERFORM;
		} else {
			account_type = ds_uf2atype(uac);
			ret = samdb_msg_add_uint(ldb,
						 ac->msg, ac->msg,
						 "sAMAccountType",
						 account_type);
			if (ret != LDB_SUCCESS) {
				return ret;
			}
		}
	} else if (strcmp("group", ac->type) == 0) {
		group_type = samdb_result_uint(ac->msg, "groupType", 0);
		if (group_type == 0) {
			ldb_asprintf_errstring(ldb,
				"groupType invalid!\n");
			return LDB_ERR_UNWILLING_TO_PERFORM;
		} else {
			account_type = ds_gtype2atype(group_type);
			ret = samdb_msg_add_uint(ldb,
						 ac->msg, ac->msg,
						 "sAMAccountType",
						 account_type);
			if (ret != LDB_SUCCESS) {
				return ret;
			}
		}
	}

	return samldb_next_step(ac);
}

/* primaryGroupID handling */

static int samldb_check_primaryGroupID(struct samldb_ctx *ac)
{
	struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
	struct ldb_dn *prim_group_dn;
	uint32_t rid;
	struct dom_sid *sid;
	int ret;

	rid = samdb_result_uint(ac->msg, "primaryGroupID", (uint32_t) -1);
	if (rid == (uint32_t) -1) {
		uint32_t uac = samdb_result_uint(ac->msg, "userAccountControl",
						 0);

		rid = ds_uf2prim_group_rid(uac);

		ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
					 "primaryGroupID", rid);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	} else if (!ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
		ldb_set_errstring(ldb,
				  "The primary group isn't settable on add operations!");
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
	if (sid == NULL) {
		return ldb_operr(ldb);
	}

	prim_group_dn = samdb_search_dn(ldb, ac, NULL, "(objectSid=%s)",
					ldap_encode_ndr_dom_sid(ac, sid));
	if (prim_group_dn == NULL) {
		ldb_asprintf_errstring(ldb,
				       "Failed to find primary group with RID %u!",
				       rid);
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	return samldb_next_step(ac);
}


static bool samldb_msg_add_sid(struct ldb_message *msg,
				const char *name,
				const struct dom_sid *sid)
{
	struct ldb_val v;
	enum ndr_err_code ndr_err;

	ndr_err = ndr_push_struct_blob(&v, msg, sid,
				       (ndr_push_flags_fn_t)ndr_push_dom_sid);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		return false;
	}
	return (ldb_msg_add_value(msg, name, &v, NULL) == 0);
}


/* allocate a SID using our RID Set */
static int samldb_allocate_sid(struct samldb_ctx *ac)
{
	uint32_t rid;
	struct dom_sid *sid;
	struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
	int ret;

	ret = ridalloc_allocate_rid(ac->module, &rid);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
	if (sid == NULL) {
		return ldb_module_oom(ac->module);
	}

	if ( ! samldb_msg_add_sid(ac->msg, "objectSid", sid)) {
		return ldb_operr(ldb);
	}

	return samldb_next_step(ac);
}

/*
  see if a krbtgt_number is available
 */
static bool samldb_krbtgtnumber_available(struct samldb_ctx *ac, unsigned krbtgt_number)
{
	TALLOC_CTX *tmp_ctx = talloc_new(ac);
	struct ldb_result *res;
	const char *attrs[] = { NULL };
	int ret;

	ret = dsdb_module_search(ac->module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
				 attrs, DSDB_FLAG_NEXT_MODULE,
				 "msDC-SecondaryKrbTgtNumber=%u", krbtgt_number);
	if (ret == LDB_SUCCESS && res->count == 0) {
		talloc_free(tmp_ctx);
		return true;
	}
	talloc_free(tmp_ctx);
	return false;
}

/* special handling for add in RODC join */
static int samldb_rodc_add(struct samldb_ctx *ac)
{
	struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
	unsigned krbtgt_number, i_start, i;
	int ret;

	/* find a unused msDC-SecondaryKrbTgtNumber */
	i_start = generate_random() & 0xFFFF;
	if (i_start == 0) {
		i_start = 1;
	}

	for (i=i_start; i<=0xFFFF; i++) {
		if (samldb_krbtgtnumber_available(ac, i)) {
			krbtgt_number = i;
			goto found;
		}
	}
	for (i=1; i<i_start; i++) {
		if (samldb_krbtgtnumber_available(ac, i)) {
			krbtgt_number = i;
			goto found;
		}
	}

	ldb_asprintf_errstring(ldb_module_get_ctx(ac->module),
			       "%08X: Unable to find available msDS-SecondaryKrbTgtNumber",
			       W_ERROR_V(WERR_NO_SYSTEM_RESOURCES));
	return LDB_ERR_OTHER;

found:
	ret = ldb_msg_add_empty(ac->msg, "msDS-SecondaryKrbTgtNumber", LDB_FLAG_INTERNAL_DISABLE_VALIDATION, NULL);
	if (ret != LDB_SUCCESS) {
		return ldb_operr(ldb);
	}

	ret = ldb_msg_add_fmt(ac->msg, "msDS-SecondaryKrbTgtNumber", "%u", krbtgt_number);
	if (ret != LDB_SUCCESS) {
		return ldb_operr(ldb);
	}

	ret = ldb_msg_add_fmt(ac->msg, "sAMAccountName", "krbtgt_%u", krbtgt_number);
	if (ret != LDB_SUCCESS) {
		return ldb_operr(ldb);
	}

	return samldb_next_step(ac);
}

static int samldb_find_for_defaultObjectCategory(struct samldb_ctx *ac)
{
	struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
	struct ldb_result *res;
	const char *no_attrs[] = { NULL };
        int ret;

	ac->res_dn = NULL;

	ret = dsdb_module_search(ac->module, ac, &res,
				 ac->dn, LDB_SCOPE_BASE, no_attrs,
				 DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT | DSDB_FLAG_NEXT_MODULE,
				 "(objectClass=classSchema)");
	if (ret == LDB_ERR_NO_SUCH_OBJECT) {
		/* Don't be pricky when the DN doesn't exist if we have the */
		/* RELAX control specified */
		if (ldb_request_get_control(ac->req,
					    LDB_CONTROL_RELAX_OID) == NULL) {
			ldb_set_errstring(ldb,
					  "samldb_find_defaultObjectCategory: "
					  "Invalid DN for 'defaultObjectCategory'!");
			return LDB_ERR_CONSTRAINT_VIOLATION;
		}
	}
	if ((ret != LDB_ERR_NO_SUCH_OBJECT) && (ret != LDB_SUCCESS)) {
		return ret;
	}

	ac->res_dn = ac->dn;

	return samldb_next_step(ac);
}

/**
 * msDS-IntId attributeSchema attribute handling
 * during LDB_ADD request processing
 */
static int samldb_add_handle_msDS_IntId(struct samldb_ctx *ac)
{
	int ret;
	bool id_exists;
	uint32_t msds_intid;
	uint32_t system_flags;
	struct ldb_context *ldb;
	struct ldb_result *ldb_res;
	struct ldb_dn *schema_dn;

	ldb = ldb_module_get_ctx(ac->module);
	schema_dn = ldb_get_schema_basedn(ldb);

	/* replicated update should always go through */
	if (ldb_request_get_control(ac->req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
		return LDB_SUCCESS;
	}

	/* msDS-IntId is handled by system and should never be
	 * passed by clients */
	if (ldb_msg_find_element(ac->msg, "msDS-IntId")) {
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	/* do not generate msDS-IntId if Relax control is passed */
	if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
		return LDB_SUCCESS;
	}

	/* check Functional Level */
	if (dsdb_functional_level(ldb) < DS_DOMAIN_FUNCTION_2003) {
		return LDB_SUCCESS;
	}

	/* check systemFlags for SCHEMA_BASE_OBJECT flag */
	system_flags = ldb_msg_find_attr_as_uint(ac->msg, "systemFlags", 0);
	if (system_flags & SYSTEM_FLAG_SCHEMA_BASE_OBJECT) {
		return LDB_SUCCESS;
	}

	/* Generate new value for msDs-IntId
	 * Value should be in 0x80000000..0xBFFFFFFF range */
	msds_intid = generate_random() % 0X3FFFFFFF;
	msds_intid += 0x80000000;

	/* probe id values until unique one is found */
	do {
		msds_intid++;
		if (msds_intid > 0xBFFFFFFF) {
			msds_intid = 0x80000001;
		}

		ret = dsdb_module_search(ac->module, ac,
		                         &ldb_res,
		                         schema_dn, LDB_SCOPE_ONELEVEL, NULL,
		                         DSDB_FLAG_NEXT_MODULE,
		                         "(msDS-IntId=%d)", msds_intid);
		if (ret != LDB_SUCCESS) {
			ldb_debug_set(ldb, LDB_DEBUG_ERROR,
				      __location__": Searching for msDS-IntId=%d failed - %s\n",
				      msds_intid,
				      ldb_errstring(ldb));
			return ldb_operr(ldb);
		}
		id_exists = (ldb_res->count > 0);

		talloc_free(ldb_res);
	} while(id_exists);

	return ldb_msg_add_fmt(ac->msg, "msDS-IntId", "%d", msds_intid);
}


/*
 * samldb_add_entry (async)
 */

static int samldb_add_entry_callback(struct ldb_request *req,
					struct ldb_reply *ares)
{
	struct ldb_context *ldb;
	struct samldb_ctx *ac;
	int ret;

	ac = talloc_get_type(req->context, struct samldb_ctx);
	ldb = ldb_module_get_ctx(ac->module);

	if (!ares) {
		return ldb_module_done(ac->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}

	if (ares->type == LDB_REPLY_REFERRAL) {
		return ldb_module_send_referral(ac->req, ares->referral);
	}

	if (ares->error != LDB_SUCCESS) {
		return ldb_module_done(ac->req, ares->controls,
					ares->response, ares->error);
	}
	if (ares->type != LDB_REPLY_DONE) {
		ldb_set_errstring(ldb,
			"Invalid reply type!\n");
		return ldb_module_done(ac->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}

	/* The caller may wish to get controls back from the add */
	ac->ares = talloc_steal(ac, ares);

	ret = samldb_next_step(ac);
	if (ret != LDB_SUCCESS) {
		return ldb_module_done(ac->req, NULL, NULL, ret);
	}
	return ret;
}

static int samldb_add_entry(struct samldb_ctx *ac)
{
	struct ldb_context *ldb;
	struct ldb_request *req;
	int ret;

	ldb = ldb_module_get_ctx(ac->module);

	ret = ldb_build_add_req(&req, ldb, ac,
				ac->msg,
				ac->req->controls,
				ac, samldb_add_entry_callback,
				ac->req);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	return ldb_next_request(ac->module, req);
}

/*
 * return true if msg carries an attributeSchema that is intended to be RODC
 * filtered but is also a system-critical attribute.
 */
static bool check_rodc_critical_attribute(struct ldb_message *msg)
{
	uint32_t schemaFlagsEx, searchFlags, rodc_filtered_flags;

	schemaFlagsEx = ldb_msg_find_attr_as_uint(msg, "schemaFlagsEx", 0);
	searchFlags = ldb_msg_find_attr_as_uint(msg, "searchFlags", 0);
	rodc_filtered_flags = (SEARCH_FLAG_RODC_ATTRIBUTE | SEARCH_FLAG_CONFIDENTIAL);

	if ((schemaFlagsEx & SCHEMA_FLAG_ATTR_IS_CRITICAL) &&
		((searchFlags & rodc_filtered_flags) == rodc_filtered_flags)) {
		return true;
	} else {
		return false;
	}
}


static int samldb_fill_object(struct samldb_ctx *ac, const char *type)
{
	struct ldb_context *ldb;
	struct loadparm_context *lp_ctx;
	enum sid_generator sid_generator;
	int ret;
	struct ldb_control *rodc_control;
	struct dom_sid *sid;

	ldb = ldb_module_get_ctx(ac->module);

	/* Add informations for the different account types */
	ac->type = type;
	if (strcmp(ac->type, "user") == 0) {
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"userAccountControl", "546");
		if (ret != LDB_SUCCESS) return ret;
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"badPwdCount", "0");
		if (ret != LDB_SUCCESS) return ret;
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"codePage", "0");
		if (ret != LDB_SUCCESS) return ret;
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"countryCode", "0");
		if (ret != LDB_SUCCESS) return ret;
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"badPasswordTime", "0");
		if (ret != LDB_SUCCESS) return ret;
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"lastLogoff", "0");
		if (ret != LDB_SUCCESS) return ret;
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"lastLogon", "0");
		if (ret != LDB_SUCCESS) return ret;
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"pwdLastSet", "0");
		if (ret != LDB_SUCCESS) return ret;
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"accountExpires", "9223372036854775807");
		if (ret != LDB_SUCCESS) return ret;
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"logonCount", "0");
		if (ret != LDB_SUCCESS) return ret;
	} else if (strcmp(ac->type, "group") == 0) {
		ret = samdb_find_or_add_attribute(ldb, ac->msg,
			"groupType", "-2147483646");
		if (ret != LDB_SUCCESS) return ret;
	} else if (strcmp(ac->type, "classSchema") == 0) {
		const struct ldb_val *rdn_value, *def_obj_cat_val;

		ret = samdb_find_or_add_attribute(ldb, ac->msg,
						  "rdnAttId", "cn");
		if (ret != LDB_SUCCESS) return ret;

		/* do not allow to mark an attributeSchema as RODC filtered if it
		 * is system-critical */
		if (check_rodc_critical_attribute(ac->msg)) {
			ldb_asprintf_errstring(ldb, "Refusing schema add of %s - cannot combine critical class with RODC filtering",
					       ldb_dn_get_linearized(ac->msg->dn));
			return LDB_ERR_UNWILLING_TO_PERFORM;
		}


		rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
		if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) {
			/* the RDN has prefix "CN" */
			ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName",
				samdb_cn_to_lDAPDisplayName(ac,
					(const char *) rdn_value->data));
			if (ret != LDB_SUCCESS) {
				ldb_oom(ldb);
				return ret;
			}
		}

		if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) {
			struct GUID guid;
			/* a new GUID */
			guid = GUID_random();
			ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID");
			if (ret != LDB_SUCCESS) {
				ldb_oom(ldb);
				return ret;
			}
		}

		def_obj_cat_val = ldb_msg_find_ldb_val(ac->msg,
						       "defaultObjectCategory");
		if (def_obj_cat_val != NULL) {
			/* "defaultObjectCategory" has been set by the caller.
			 * Do some checks for consistency.
			 * NOTE: The real constraint check (that
			 * 'defaultObjectCategory' is the DN of the new
			 * objectclass or any parent of it) is still incomplete.
			 * For now we say that 'defaultObjectCategory' is valid
			 * if it exists and it is of objectclass "classSchema".
			 */
			ac->dn = ldb_dn_from_ldb_val(ac, ldb, def_obj_cat_val);
			if (ac->dn == NULL) {
				ldb_set_errstring(ldb,
						  "Invalid DN for 'defaultObjectCategory'!");
				return LDB_ERR_CONSTRAINT_VIOLATION;
			}
		} else {
			/* "defaultObjectCategory" has not been set by the
			 * caller. Use the entry DN for it. */
			ac->dn = ac->msg->dn;

			ret = samdb_msg_add_string(ldb, ac, ac->msg,
						   "defaultObjectCategory",
						   ldb_dn_get_linearized(ac->dn));
			if (ret != LDB_SUCCESS) {
				ldb_oom(ldb);
				return ret;
			}
		}

		ret = samldb_add_step(ac, samldb_add_entry);
		if (ret != LDB_SUCCESS) return ret;

		/* Now perform the checks for the 'defaultObjectCategory'. The
		 * lookup DN was already saved in "ac->dn" */
		ret = samldb_add_step(ac, samldb_find_for_defaultObjectCategory);
		if (ret != LDB_SUCCESS) return ret;

		return samldb_first_step(ac);
	} else if (strcmp(ac->type, "attributeSchema") == 0) {
		const struct ldb_val *rdn_value;
		rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
		if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) {
			/* the RDN has prefix "CN" */
			ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName",
				samdb_cn_to_lDAPDisplayName(ac,
					(const char *) rdn_value->data));
			if (ret != LDB_SUCCESS) {
				ldb_oom(ldb);
				return ret;
			}
		}

		/* do not allow to mark an attributeSchema as RODC filtered if it
		 * is system-critical */
		if (check_rodc_critical_attribute(ac->msg)) {
			ldb_asprintf_errstring(ldb, "Refusing schema add of %s - cannot combine critical attribute with RODC filtering",
					       ldb_dn_get_linearized(ac->msg->dn));
			return LDB_ERR_UNWILLING_TO_PERFORM;
		}

		ret = samdb_find_or_add_attribute(ldb, ac->msg,
						  "isSingleValued", "FALSE");
		if (ret != LDB_SUCCESS) return ret;

		if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) {
			struct GUID guid;
			/* a new GUID */
			guid = GUID_random();
			ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID");
			if (ret != LDB_SUCCESS) {
				ldb_oom(ldb);
				return ret;
			}
		}

		/* handle msDS-IntID attribute */
		ret = samldb_add_handle_msDS_IntId(ac);
		if (ret != LDB_SUCCESS) return ret;

		ret = samldb_add_step(ac, samldb_add_entry);
		if (ret != LDB_SUCCESS) return ret;

		return samldb_first_step(ac);
	} else {
		ldb_asprintf_errstring(ldb,
			"Invalid entry type!");
		return LDB_ERR_OPERATIONS_ERROR;
	}

	rodc_control = ldb_request_get_control(ac->req, LDB_CONTROL_RODC_DCPROMO_OID);
	if (rodc_control) {
		/* see [MS-ADTS] 3.1.1.3.4.1.23 LDAP_SERVER_RODC_DCPROMO_OID */
		rodc_control->critical = false;
		ret = samldb_add_step(ac, samldb_rodc_add);
		if (ret != LDB_SUCCESS) return ret;
	}

	/* check if we have a valid sAMAccountName */
	ret = samldb_add_step(ac, samldb_check_sAMAccountName);
	if (ret != LDB_SUCCESS) return ret;

	/* check account_type/group_type */
	ret = samldb_add_step(ac, samldb_check_sAMAccountType);
	if (ret != LDB_SUCCESS) return ret;

	/* check if we have a valid primary group ID */
	if (strcmp(ac->type, "user") == 0) {
		ret = samldb_add_step(ac, samldb_check_primaryGroupID);
		if (ret != LDB_SUCCESS) return ret;
	}

	lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
		 struct loadparm_context);

	/* don't allow objectSid to be specified without the RELAX control */
	sid = samdb_result_dom_sid(ac, ac->msg, "objectSid");
	if (sid && !ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID) &&
	    !dsdb_module_am_system(ac->module)) {
		ldb_asprintf_errstring(ldb, "No SID may be specified in user/group creation for %s",
				       ldb_dn_get_linearized(ac->msg->dn));
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	if (sid == NULL) {
		sid_generator = lpcfg_sid_generator(lp_ctx);
		if (sid_generator == SID_GENERATOR_INTERNAL) {
			ret = samldb_add_step(ac, samldb_allocate_sid);
			if (ret != LDB_SUCCESS) return ret;
		}
	}

	/* finally proceed with adding the entry */
	ret = samldb_add_step(ac, samldb_add_entry);
	if (ret != LDB_SUCCESS) return ret;

	return samldb_first_step(ac);
}

static int samldb_fill_foreignSecurityPrincipal_object(struct samldb_ctx *ac)
{
	struct ldb_context *ldb;
	struct dom_sid *sid;
	int ret;

	ldb = ldb_module_get_ctx(ac->module);

	sid = samdb_result_dom_sid(ac->msg, ac->msg, "objectSid");
	if (sid == NULL) {
		sid = dom_sid_parse_talloc(ac->msg,
					   (const char *)ldb_dn_get_rdn_val(ac->msg->dn)->data);
		if (sid == NULL) {
			ldb_set_errstring(ldb,
					"No valid SID found in "
					"ForeignSecurityPrincipal CN!");
			return LDB_ERR_CONSTRAINT_VIOLATION;
		}
		if (! samldb_msg_add_sid(ac->msg, "objectSid", sid)) {
			return ldb_operr(ldb);
		}
	}

	/* finally proceed with adding the entry */
	ret = samldb_add_step(ac, samldb_add_entry);
	if (ret != LDB_SUCCESS) return ret;

	return samldb_first_step(ac);
}

static int samldb_schema_info_update(struct samldb_ctx *ac)
{
	WERROR werr;
	struct ldb_context *ldb;
	struct dsdb_schema *schema;

	/* replicated update should always go through */
	if (ldb_request_get_control(ac->req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
		return LDB_SUCCESS;
	}

	/* do not update schemaInfo during provisioning */
	if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
		return LDB_SUCCESS;
	}

	ldb = ldb_module_get_ctx(ac->module);
	schema = dsdb_get_schema(ldb, NULL);
	if (!schema) {
		ldb_debug_set(ldb, LDB_DEBUG_FATAL,
			      "samldb_schema_info_update: no dsdb_schema loaded");
		DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
		return ldb_operr(ldb);
	}

	werr = dsdb_module_schema_info_update(ac->module, schema, DSDB_FLAG_NEXT_MODULE);
	if (!W_ERROR_IS_OK(werr)) {
		ldb_debug_set(ldb, LDB_DEBUG_FATAL,
			      "samldb_schema_info_update: "
		              "dsdb_module_schema_info_update failed with %s",
		              win_errstr(werr));
		DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
		return ldb_operr(ldb);
	}

	return LDB_SUCCESS;
}


static int samldb_prim_group_change(struct samldb_ctx *ac)
{
	struct ldb_context *ldb;
	const char * attrs[] = { "primaryGroupID", "memberOf", NULL };
	struct ldb_result *res;
	struct ldb_message_element *el;
	struct ldb_message *msg;
	uint32_t rid;
	struct dom_sid *sid;
	struct ldb_dn *prev_prim_group_dn, *new_prim_group_dn;
	int ret;

	ldb = ldb_module_get_ctx(ac->module);

	/* Fetch informations from the existing object */

	ret = ldb_search(ldb, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
			 NULL);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	/* Finds out the DN of the old primary group */

	rid = samdb_result_uint(res->msgs[0], "primaryGroupID", (uint32_t) -1);
	if (rid == (uint32_t) -1) {
		/* User objects do always have a mandatory "primaryGroupID"
		 * attribute. If this doesn't exist then the object is of the
		 * wrong type. This is the exact Windows error code */
		return LDB_ERR_OBJECT_CLASS_VIOLATION;
	}

	sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
	if (sid == NULL) {
		return ldb_operr(ldb);
	}

	prev_prim_group_dn = samdb_search_dn(ldb, ac, NULL, "(objectSid=%s)",
					     ldap_encode_ndr_dom_sid(ac, sid));
	if (prev_prim_group_dn == NULL) {
		return ldb_operr(ldb);
	}

	/* Finds out the DN of the new primary group */

	rid = samdb_result_uint(ac->msg, "primaryGroupID", (uint32_t) -1);
	if (rid == (uint32_t) -1) {
		/* we aren't affected of any primary group change */
		return LDB_SUCCESS;
	}

	sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
	if (sid == NULL) {
		return ldb_operr(ldb);
	}

	new_prim_group_dn = samdb_search_dn(ldb, ac, NULL, "(objectSid=%s)",
					    ldap_encode_ndr_dom_sid(ac, sid));
	if (new_prim_group_dn == NULL) {
		/* Here we know if the specified new primary group candidate is
		 * valid or not. */
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	/* Only update the "member" attributes when we really do have a change */
	if (ldb_dn_compare(new_prim_group_dn, prev_prim_group_dn) != 0) {
		/* We need to be already a normal member of the new primary
		 * group in order to be successful. */
		el = samdb_find_attribute(ldb, res->msgs[0], "memberOf",
					  ldb_dn_get_linearized(new_prim_group_dn));
		if (el == NULL) {
			return LDB_ERR_UNWILLING_TO_PERFORM;
		}

		/* Remove the "member" attribute on the new primary group */
		msg = talloc_zero(ac, struct ldb_message);
		msg->dn = new_prim_group_dn;

		ret = samdb_msg_add_delval(ldb, ac, msg, "member",
					   ldb_dn_get_linearized(ac->msg->dn));
		if (ret != LDB_SUCCESS) {
			return ret;
		}

		ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE);
		if (ret != LDB_SUCCESS) {
			return ret;
		}

		/* Add a "member" attribute for the previous primary group */
		msg = talloc_zero(ac, struct ldb_message);
		msg->dn = prev_prim_group_dn;

		ret = samdb_msg_add_addval(ldb, ac, msg, "member",
					   ldb_dn_get_linearized(ac->msg->dn));
		if (ret != LDB_SUCCESS) {
			return ret;
		}

		ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}

	return LDB_SUCCESS;
}


static int samldb_member_check(struct samldb_ctx *ac)
{
	struct ldb_context *ldb;
	struct ldb_message_element *el;
	struct ldb_dn *member_dn, *group_dn;
	uint32_t prim_group_rid;
	struct dom_sid *sid;
	unsigned int i;

	ldb = ldb_module_get_ctx(ac->module);

	el = ldb_msg_find_element(ac->msg, "member");
	if (el == NULL) {
		/* we aren't affected */
		return LDB_SUCCESS;
	}

	for (i = 0; i < el->num_values; i++) {
		/* Denies to add "member"s to groups which are primary ones
		 * for them */
		member_dn = ldb_dn_from_ldb_val(ac, ldb, &el->values[i]);
		if (!ldb_dn_validate(member_dn)) {
			return ldb_operr(ldb);
		}

		prim_group_rid = samdb_search_uint(ldb, ac, (uint32_t) -1,
						   member_dn, "primaryGroupID",
						   NULL);
		if (prim_group_rid == (uint32_t) -1) {
			/* the member hasn't to be a user account -> therefore
			 * no check needed in this case. */
			continue;
		}

		sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb),
				      prim_group_rid);
		if (sid == NULL) {
			return ldb_operr(ldb);
		}

		group_dn = samdb_search_dn(ldb, ac, NULL, "(objectSid=%s)",
					   ldap_encode_ndr_dom_sid(ac, sid));
		if (group_dn == NULL) {
			return ldb_operr(ldb);
		}

		if (ldb_dn_compare(group_dn, ac->msg->dn) == 0) {
			return LDB_ERR_ENTRY_ALREADY_EXISTS;
		}
	}

	return LDB_SUCCESS;
}


/* add */
static int samldb_add(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_context *ldb;
	struct samldb_ctx *ac;
	int ret;

	ldb = ldb_module_get_ctx(module);
	ldb_debug(ldb, LDB_DEBUG_TRACE, "samldb_add\n");

	/* do not manipulate our control entries */
	if (ldb_dn_is_special(req->op.add.message->dn)) {
		return ldb_next_request(module, req);
	}

	ac = samldb_ctx_init(module, req);
	if (ac == NULL) {
		return ldb_operr(ldb);
	}

	/* build the new msg */
	ac->msg = ldb_msg_copy(ac, ac->req->op.add.message);
	if (!ac->msg) {
		talloc_free(ac);
		ldb_debug(ldb, LDB_DEBUG_FATAL,
			  "samldb_add: ldb_msg_copy failed!\n");
		return ldb_operr(ldb);
	}

	if (samdb_find_attribute(ldb, ac->msg,
				 "objectclass", "user") != NULL) {
		return samldb_fill_object(ac, "user");
	}

	if (samdb_find_attribute(ldb, ac->msg,
				 "objectclass", "group") != NULL) {
		return samldb_fill_object(ac, "group");
	}

	/* perhaps a foreignSecurityPrincipal? */
	if (samdb_find_attribute(ldb, ac->msg,
				 "objectclass",
				 "foreignSecurityPrincipal") != NULL) {
		return samldb_fill_foreignSecurityPrincipal_object(ac);
	}

	if (samdb_find_attribute(ldb, ac->msg,
				 "objectclass", "classSchema") != NULL) {
		ret = samldb_schema_info_update(ac);
		if (ret != LDB_SUCCESS) {
			talloc_free(ac);
			return ret;
		}

		return samldb_fill_object(ac, "classSchema");
	}

	if (samdb_find_attribute(ldb, ac->msg,
				 "objectclass", "attributeSchema") != NULL) {
		ret = samldb_schema_info_update(ac);
		if (ret != LDB_SUCCESS) {
			talloc_free(ac);
			return ret;
		}

		return samldb_fill_object(ac, "attributeSchema");
	}

	talloc_free(ac);

	/* nothing matched, go on */
	return ldb_next_request(module, req);
}

/* modify */
static int samldb_modify(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_context *ldb;
	struct samldb_ctx *ac;
	struct ldb_message *msg;
	struct ldb_message_element *el, *el2;
	int ret;
	uint32_t account_type;

	if (ldb_dn_is_special(req->op.mod.message->dn)) {
		/* do not manipulate our control entries */
		return ldb_next_request(module, req);
	}

	ldb = ldb_module_get_ctx(module);

	if (ldb_msg_find_element(req->op.mod.message, "sAMAccountType") != NULL) {
		ldb_asprintf_errstring(ldb,
			"sAMAccountType must not be specified!");
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	/* msDS-IntId is not allowed to be modified
	 * except when modification comes from replication */
	if (ldb_msg_find_element(req->op.mod.message, "msDS-IntId")) {
		if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
			return LDB_ERR_CONSTRAINT_VIOLATION;
		}
	}

	ac = samldb_ctx_init(module, req);
	if (ac == NULL) {
		return ldb_operr(ldb);
	}

	/* TODO: do not modify original request, create a new one */

	el = ldb_msg_find_element(req->op.mod.message, "groupType");
	if (el && (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) && el->num_values == 1) {
		uint32_t group_type;

		req->op.mod.message = msg = ldb_msg_copy_shallow(req,
			req->op.mod.message);

		group_type = strtoul((const char *)el->values[0].data, NULL, 0);
		account_type =  ds_gtype2atype(group_type);
		ret = samdb_msg_add_uint(ldb, msg, msg,
					 "sAMAccountType",
					 account_type);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
		el2 = ldb_msg_find_element(msg, "sAMAccountType");
		el2->flags = LDB_FLAG_MOD_REPLACE;
	}
	if (el && (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE)) {
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	el = ldb_msg_find_element(req->op.mod.message, "primaryGroupID");
	if (el && (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) && el->num_values == 1) {
		req->op.mod.message = ac->msg = ldb_msg_copy_shallow(req,
			req->op.mod.message);

		ret = samldb_prim_group_change(ac);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}
	if (el && (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE)) {
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	el = ldb_msg_find_element(req->op.mod.message, "userAccountControl");
	if (el && (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) && el->num_values == 1) {
		uint32_t user_account_control;

		req->op.mod.message = msg = ldb_msg_copy_shallow(req,
			req->op.mod.message);

		user_account_control = strtoul((const char *)el->values[0].data,
			NULL, 0);
		account_type = ds_uf2atype(user_account_control);
		ret = samdb_msg_add_uint(ldb, msg, msg,
					 "sAMAccountType",
					 account_type);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
		el2 = ldb_msg_find_element(msg, "sAMAccountType");
		el2->flags = LDB_FLAG_MOD_REPLACE;

		if (user_account_control & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
			ret = samdb_msg_add_string(ldb, msg, msg,
						   "isCriticalSystemObject", "TRUE");
			if (ret != LDB_SUCCESS) {
				return ret;
			}
			el2 = ldb_msg_find_element(msg, "isCriticalSystemObject");
			el2->flags = LDB_FLAG_MOD_REPLACE;
		}

		if (!ldb_msg_find_element(msg, "primaryGroupID")) {
			uint32_t rid = ds_uf2prim_group_rid(user_account_control);

			ret = samdb_msg_add_uint(ldb, msg, msg,
						 "primaryGroupID", rid);
			if (ret != LDB_SUCCESS) {
				return ret;
			}
			el2 = ldb_msg_find_element(msg,
						   "primaryGroupID");
			el2->flags = LDB_FLAG_MOD_REPLACE;
		}
	}
	if (el && (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE)) {
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	el = ldb_msg_find_element(req->op.mod.message, "member");
	if (el && el->flags & (LDB_FLAG_MOD_ADD|LDB_FLAG_MOD_REPLACE) && el->num_values == 1) {
		req->op.mod.message = ac->msg = ldb_msg_copy_shallow(req,
			req->op.mod.message);

		ret = samldb_member_check(ac);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}

	return ldb_next_request(module, req);
}

/* delete */

static int samldb_prim_group_users_check(struct samldb_ctx *ac)
{
	struct ldb_context *ldb;
	struct dom_sid *sid;
	uint32_t rid;
	NTSTATUS status;
	int count;

	ldb = ldb_module_get_ctx(ac->module);

	/* Finds out the SID/RID of the SAM object */
	sid = samdb_search_dom_sid(ldb, ac, ac->req->op.del.dn, "objectSid",
				   NULL);
	if (sid == NULL) {
		/* No SID - it might not be a SAM object - therefore ok */
		return LDB_SUCCESS;
	}
	status = dom_sid_split_rid(ac, sid, NULL, &rid);
	if (!NT_STATUS_IS_OK(status)) {
		return ldb_operr(ldb);
	}
	if (rid == 0) {
		/* Special object (security principal?) */
		return LDB_SUCCESS;
	}

	/* Deny delete requests from groups which are primary ones */
	count = samdb_search_count(ldb, NULL,
				   "(&(primaryGroupID=%u)(objectClass=user))",
				   rid);
	if (count < 0) {
		return ldb_operr(ldb);
	}
	if (count > 0) {
		return LDB_ERR_ENTRY_ALREADY_EXISTS;
	}

	return LDB_SUCCESS;
}

static int samldb_delete(struct ldb_module *module, struct ldb_request *req)
{
	struct samldb_ctx *ac;
	int ret;

	if (ldb_dn_is_special(req->op.del.dn)) {
		/* do not manipulate our control entries */
		return ldb_next_request(module, req);
	}

	ac = samldb_ctx_init(module, req);
	if (ac == NULL) {
		return ldb_operr(ldb_module_get_ctx(module));
	}

	ret = samldb_prim_group_users_check(ac);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	talloc_free(ac);

	return ldb_next_request(module, req);
}

/* extended */

static int samldb_extended_allocate_rid_pool(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_context *ldb = ldb_module_get_ctx(module);
	struct dsdb_fsmo_extended_op *exop;
	int ret;

	exop = talloc_get_type(req->op.extended.data, struct dsdb_fsmo_extended_op);
	if (!exop) {
		ldb_debug(ldb, LDB_DEBUG_FATAL, "samldb_extended_allocate_rid_pool: invalid extended data\n");
		return LDB_ERR_PROTOCOL_ERROR;
	}

	ret = ridalloc_allocate_rid_pool_fsmo(module, exop);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
}

static int samldb_extended(struct ldb_module *module, struct ldb_request *req)
{
	if (strcmp(req->op.extended.oid, DSDB_EXTENDED_ALLOCATE_RID_POOL) == 0) {
		return samldb_extended_allocate_rid_pool(module, req);
	}

	return ldb_next_request(module, req);
}


_PUBLIC_ const struct ldb_module_ops ldb_samldb_module_ops = {
	.name          = "samldb",
	.add           = samldb_add,
	.modify        = samldb_modify,
	.del           = samldb_delete,
	.extended      = samldb_extended
};