summaryrefslogtreecommitdiff
path: root/source3/winbindd/idmap_tdb.c
blob: d00ffbe90113ff1cc1b7c0a3b4d0b226d4845060 (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
/* 
   Unix SMB/CIFS implementation.

   idmap TDB backend

   Copyright (C) Tim Potter 2000
   Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
   Copyright (C) Jeremy Allison 2006
   Copyright (C) Simo Sorce 2003-2006
   Copyright (C) Michael Adam 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/>.
*/

#include "includes.h"
#include "winbindd.h"
#include "idmap_rw.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_IDMAP

/* idmap version determines auto-conversion - this is the database
   structure version specifier. */

#define IDMAP_VERSION 2

struct idmap_tdb_context {
	struct db_context *db;
	struct idmap_rw_ops *rw_ops;
};

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

struct convert_fn_state {
	struct db_context *db;
	bool failed;
};

/*****************************************************************************
 For idmap conversion: convert one record to new format
 Ancient versions (eg 2.2.3a) of winbindd_idmap.tdb mapped DOMAINNAME/rid
 instead of the SID.
*****************************************************************************/
static int convert_fn(struct db_record *rec, void *private_data)
{
	struct winbindd_domain *domain;
	char *p;
	NTSTATUS status;
	struct dom_sid sid;
	uint32 rid;
	fstring keystr;
	fstring dom_name;
	TDB_DATA key2;
	struct convert_fn_state *s = (struct convert_fn_state *)private_data;

	DEBUG(10,("Converting %s\n", (const char *)rec->key.dptr));

	p = strchr((const char *)rec->key.dptr, '/');
	if (!p)
		return 0;

	*p = 0;
	fstrcpy(dom_name, (const char *)rec->key.dptr);
	*p++ = '/';

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

		status = rec->delete_rec(rec);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0, ("Unable to delete record %s:%s\n",
				(const char *)rec->key.dptr,
				nt_errstr(status)));
			s->failed = true;
			return -1;
		}

		return 0;
	}

	rid = atoi(p);

	sid_compose(&sid, &domain->sid, rid);

	sid_to_fstring(keystr, &sid);
	key2 = string_term_tdb_data(keystr);

	status = dbwrap_store(s->db, key2, rec->value, TDB_INSERT);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("Unable to add record %s:%s\n",
			(const char *)key2.dptr,
			nt_errstr(status)));
		s->failed = true;
		return -1;
	}

	status = dbwrap_store(s->db, rec->value, key2, TDB_REPLACE);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("Unable to update record %s:%s\n",
			(const char *)rec->value.dptr,
			nt_errstr(status)));
		s->failed = true;
		return -1;
	}

	status = rec->delete_rec(rec);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("Unable to delete record %s:%s\n",
			(const char *)rec->key.dptr,
			nt_errstr(status)));
		s->failed = true;
		return -1;
	}

	return 0;
}

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

static bool idmap_tdb_upgrade(struct idmap_domain *dom, struct db_context *db)
{
	int32 vers;
	bool bigendianheader;
	struct convert_fn_state s;

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

	bigendianheader = (db->get_flags(db) & TDB_BIGENDIAN) ? True : False;

	vers = dbwrap_fetch_int32(db, "IDMAP_VERSION");

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

		int32 wm;

		wm = dbwrap_fetch_int32(db, HWM_USER);

		if (wm != -1) {
			wm = IREV(wm);
		}  else {
			wm = dom->low_id;
		}

		if (dbwrap_store_int32(db, HWM_USER, wm) == -1) {
			DEBUG(0, ("Unable to byteswap user hwm in idmap database\n"));
			return False;
		}

		wm = dbwrap_fetch_int32(db, HWM_GROUP);
		if (wm != -1) {
			wm = IREV(wm);
		} else {
			wm = dom->low_id;
		}

		if (dbwrap_store_int32(db, HWM_GROUP, wm) == -1) {
			DEBUG(0, ("Unable to byteswap group hwm in idmap database\n"));
			return False;
		}
	}

	s.db = db;
	s.failed = false;

	/* the old format stored as DOMAIN/rid - now we store the SID direct */
	db->traverse(db, convert_fn, &s);

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

	if (dbwrap_store_int32(db, "IDMAP_VERSION", IDMAP_VERSION) == -1) {
		DEBUG(0, ("Unable to store idmap version in databse\n"));
		return False;
	}

	return True;
}

static NTSTATUS idmap_tdb_init_hwm(struct idmap_domain *dom)
{
	int ret;
	uint32_t low_uid;
	uint32_t low_gid;
	bool update_uid = false;
	bool update_gid = false;
	struct idmap_tdb_context *ctx;

	ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);

	low_uid = dbwrap_fetch_int32(ctx->db, HWM_USER);
	if (low_uid == -1 || low_uid < dom->low_id) {
		update_uid = true;
	}

	low_gid = dbwrap_fetch_int32(ctx->db, HWM_GROUP);
	if (low_gid == -1 || low_gid < dom->low_id) {
		update_gid = true;
	}

	if (!update_uid && !update_gid) {
		return NT_STATUS_OK;
	}

	if (ctx->db->transaction_start(ctx->db) != 0) {
		DEBUG(0, ("Unable to start upgrade transaction!\n"));
		return NT_STATUS_INTERNAL_DB_ERROR;
	}

	if (update_uid) {
		ret = dbwrap_store_int32(ctx->db, HWM_USER, dom->low_id);
		if (ret == -1) {
			ctx->db->transaction_cancel(ctx->db);
			DEBUG(0, ("Unable to initialise user hwm in idmap "
				  "database\n"));
			return NT_STATUS_INTERNAL_DB_ERROR;
		}
	}

	if (update_gid) {
		ret = dbwrap_store_int32(ctx->db, HWM_GROUP, dom->low_id);
		if (ret == -1) {
			ctx->db->transaction_cancel(ctx->db);
			DEBUG(0, ("Unable to initialise group hwm in idmap "
				  "database\n"));
			return NT_STATUS_INTERNAL_DB_ERROR;
		}
	}

	if (ctx->db->transaction_commit(ctx->db) != 0) {
		DEBUG(0, ("Unable to commit upgrade transaction!\n"));
		return NT_STATUS_INTERNAL_DB_ERROR;
	}

	return NT_STATUS_OK;
}

static NTSTATUS idmap_tdb_open_db(struct idmap_domain *dom)
{
	NTSTATUS ret;
	TALLOC_CTX *mem_ctx;
	char *tdbfile = NULL;
	struct db_context *db = NULL;
	int32_t version;
	bool config_error = false;
	struct idmap_tdb_context *ctx;

	ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);

	if (ctx->db) {
		/* it is already open */
		return NT_STATUS_OK;
	}

	/* use our own context here */
	mem_ctx = talloc_stackframe();

	/* use the old database if present */
	tdbfile = state_path("winbindd_idmap.tdb");
	if (!tdbfile) {
		DEBUG(0, ("Out of memory!\n"));
		ret = NT_STATUS_NO_MEMORY;
		goto done;
	}

	DEBUG(10,("Opening tdbfile %s\n", tdbfile ));

	/* Open idmap repository */
	db = db_open(mem_ctx, tdbfile, 0, TDB_DEFAULT, O_RDWR | O_CREAT, 0644);
	if (!db) {
		DEBUG(0, ("Unable to open idmap database\n"));
		ret = NT_STATUS_UNSUCCESSFUL;
		goto done;
	}

	/* check against earlier versions */
	version = dbwrap_fetch_int32(db, "IDMAP_VERSION");
	if (version != IDMAP_VERSION) {
		if (config_error) {
			DEBUG(0,("Upgrade of IDMAP_VERSION from %d to %d is not "
				 "possible with incomplete configuration\n",
				 version, IDMAP_VERSION));
			ret = NT_STATUS_UNSUCCESSFUL;
			goto done;
		}
		if (db->transaction_start(db) != 0) {
			DEBUG(0, ("Unable to start upgrade transaction!\n"));
			ret = NT_STATUS_INTERNAL_DB_ERROR;
			goto done;
		}

		if (!idmap_tdb_upgrade(dom, db)) {
			db->transaction_cancel(db);
			DEBUG(0, ("Unable to open idmap database, it's in an old format, and upgrade failed!\n"));
			ret = NT_STATUS_INTERNAL_DB_ERROR;
			goto done;
		}

		if (db->transaction_commit(db) != 0) {
			DEBUG(0, ("Unable to commit upgrade transaction!\n"));
			ret = NT_STATUS_INTERNAL_DB_ERROR;
			goto done;
		}
	}

	ctx->db = talloc_move(ctx, &db);

	ret = idmap_tdb_init_hwm(dom);

done:
	talloc_free(mem_ctx);
	return ret;
}

/**********************************************************************
 IDMAP ALLOC TDB BACKEND
**********************************************************************/
 
/**********************************
 Allocate a new id. 
**********************************/

struct idmap_tdb_allocate_id_context {
	const char *hwmkey;
	const char *hwmtype;
	uint32_t high_hwm;
	uint32_t hwm;
};

static NTSTATUS idmap_tdb_allocate_id_action(struct db_context *db,
					     void *private_data)
{
	NTSTATUS ret;
	struct idmap_tdb_allocate_id_context *state;
	uint32_t hwm;

	state = (struct idmap_tdb_allocate_id_context *)private_data;

	hwm = dbwrap_fetch_int32(db, state->hwmkey);
	if (hwm == -1) {
		ret = NT_STATUS_INTERNAL_DB_ERROR;
		goto done;
	}

	/* check it is in the range */
	if (hwm > state->high_hwm) {
		DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
			  state->hwmtype, (unsigned long)state->high_hwm));
		ret = NT_STATUS_UNSUCCESSFUL;
		goto done;
	}

	/* fetch a new id and increment it */
	ret = dbwrap_trans_change_uint32_atomic(db, state->hwmkey, &hwm, 1);
	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(0, ("Fatal error while fetching a new %s value: %s\n!",
			  state->hwmtype, nt_errstr(ret)));
		goto done;
	}

	/* recheck it is in the range */
	if (hwm > state->high_hwm) {
		DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
			  state->hwmtype, (unsigned long)state->high_hwm));
		ret = NT_STATUS_UNSUCCESSFUL;
		goto done;
	}

	ret = NT_STATUS_OK;
	state->hwm = hwm;

done:
	return ret;
}

static NTSTATUS idmap_tdb_allocate_id(struct idmap_domain *dom,
				      struct unixid *xid)
{
	const char *hwmkey;
	const char *hwmtype;
	uint32_t high_hwm;
	uint32_t hwm = 0;
	NTSTATUS status;
	struct idmap_tdb_allocate_id_context state;
	struct idmap_tdb_context *ctx;

	ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);

	/* Get current high water mark */
	switch (xid->type) {

	case ID_TYPE_UID:
		hwmkey = HWM_USER;
		hwmtype = "UID";
		break;

	case ID_TYPE_GID:
		hwmkey = HWM_GROUP;
		hwmtype = "GID";
		break;

	default:
		DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
		return NT_STATUS_INVALID_PARAMETER;
	}

	high_hwm = dom->high_id;

	state.hwm = hwm;
	state.high_hwm = high_hwm;
	state.hwmtype = hwmtype;
	state.hwmkey = hwmkey;

	status = dbwrap_trans_do(ctx->db, idmap_tdb_allocate_id_action,
				 &state);

	if (NT_STATUS_IS_OK(status)) {
		xid->id = state.hwm;
		DEBUG(10,("New %s = %d\n", hwmtype, state.hwm));
	} else {
		DEBUG(1, ("Error allocating a new %s\n", hwmtype));
	}

	return status;
}

/**
 * Allocate a new unix-ID.
 * For now this is for the default idmap domain only.
 * Should be extended later on.
 */
static NTSTATUS idmap_tdb_get_new_id(struct idmap_domain *dom,
				     struct unixid *id)
{
	NTSTATUS ret;

	if (!strequal(dom->name, "*")) {
		DEBUG(3, ("idmap_tdb_get_new_id: "
			  "Refusing allocation of a new unixid for domain'%s'. "
			  "Currently only supported for the default "
			  "domain \"*\".\n",
			   dom->name));
		return NT_STATUS_NOT_IMPLEMENTED;
	}

	ret = idmap_tdb_allocate_id(dom, id);

	return ret;
}

/**********************************************************************
 IDMAP MAPPING TDB BACKEND
**********************************************************************/

/*****************************
 Initialise idmap database. 
*****************************/

static NTSTATUS idmap_tdb_set_mapping(struct idmap_domain *dom,
				      const struct id_map *map);

static NTSTATUS idmap_tdb_db_init(struct idmap_domain *dom, const char *params)
{
	NTSTATUS ret;
	struct idmap_tdb_context *ctx;

	DEBUG(10, ("idmap_tdb_db_init called for domain '%s'\n", dom->name));

	ctx = talloc_zero(dom, struct idmap_tdb_context);
	if ( ! ctx) {
		DEBUG(0, ("Out of memory!\n"));
		return NT_STATUS_NO_MEMORY;
	}

	/* load backend specific configuration here: */
#if 0
	if (strequal(dom->name, "*")) {
	} else {
	}
#endif

	ctx->rw_ops = talloc_zero(ctx, struct idmap_rw_ops);
	if (ctx->rw_ops == NULL) {
		DEBUG(0, ("Out of memory!\n"));
		ret = NT_STATUS_NO_MEMORY;
		goto failed;
	}

	ctx->rw_ops->get_new_id = idmap_tdb_get_new_id;
	ctx->rw_ops->set_mapping = idmap_tdb_set_mapping;

	dom->private_data = ctx;

	ret = idmap_tdb_open_db(dom);
	if ( ! NT_STATUS_IS_OK(ret)) {
		goto failed;
	}

	return NT_STATUS_OK;

failed:
	talloc_free(ctx);
	return ret;
}


/**
 * store a mapping in the database
 */

struct idmap_tdb_set_mapping_context {
	const char *ksidstr;
	const char *kidstr;
};

static NTSTATUS idmap_tdb_set_mapping_action(struct db_context *db,
					     void *private_data)
{
	NTSTATUS ret;
	struct idmap_tdb_set_mapping_context *state;

	state = (struct idmap_tdb_set_mapping_context *)private_data;

	DEBUG(10, ("Storing %s <-> %s map\n", state->ksidstr, state->kidstr));

	ret = dbwrap_store_bystring(db, state->ksidstr,
				    string_term_tdb_data(state->kidstr),
				    TDB_REPLACE);
	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(0, ("Error storing SID -> ID (%s -> %s): %s\n",
			  state->ksidstr, state->kidstr, nt_errstr(ret)));
		goto done;
	}

	ret = dbwrap_store_bystring(db, state->kidstr,
				    string_term_tdb_data(state->ksidstr),
				    TDB_REPLACE);
	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(0, ("Error storing ID -> SID (%s -> %s): %s\n",
			  state->kidstr, state->ksidstr, nt_errstr(ret)));
		goto done;
	}

	DEBUG(10,("Stored %s <-> %s\n", state->ksidstr, state->kidstr));
	ret = NT_STATUS_OK;

done:
	return ret;
}

static NTSTATUS idmap_tdb_set_mapping(struct idmap_domain *dom,
				      const struct id_map *map)
{
	struct idmap_tdb_context *ctx;
	NTSTATUS ret;
	char *ksidstr, *kidstr;
	struct idmap_tdb_set_mapping_context state;

	if (!map || !map->sid) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	ksidstr = kidstr = NULL;

	/* TODO: should we filter a set_mapping using low/high filters ? */

	ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);

	switch (map->xid.type) {

	case ID_TYPE_UID:
		kidstr = talloc_asprintf(ctx, "UID %lu",
					 (unsigned long)map->xid.id);
		break;

	case ID_TYPE_GID:
		kidstr = talloc_asprintf(ctx, "GID %lu",
					 (unsigned long)map->xid.id);
		break;

	default:
		DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
		return NT_STATUS_INVALID_PARAMETER;
	}

	if (kidstr == NULL) {
		DEBUG(0, ("ERROR: Out of memory!\n"));
		ret = NT_STATUS_NO_MEMORY;
		goto done;
	}

	ksidstr = sid_string_talloc(ctx, map->sid);
	if (ksidstr == NULL) {
		DEBUG(0, ("Out of memory!\n"));
		ret = NT_STATUS_NO_MEMORY;
		goto done;
	}

	state.ksidstr = ksidstr;
	state.kidstr = kidstr;

	ret = dbwrap_trans_do(ctx->db, idmap_tdb_set_mapping_action, &state);

done:
	talloc_free(ksidstr);
	talloc_free(kidstr);
	return ret;
}

/**
 * Create a new mapping for an unmapped SID, also allocating a new ID.
 * This should be run inside a transaction.
 *
 * TODO:
 * Properly integrate this with multi domain idmap config:
 * Currently, the allocator is default-config only.
 */
static NTSTATUS idmap_tdb_new_mapping(struct idmap_domain *dom, struct id_map *map)
{
	NTSTATUS ret;
	struct idmap_tdb_context *ctx;

	ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);

	ret = idmap_rw_new_mapping(dom, ctx->rw_ops, map);

	return ret;
}


/**********************************
 Single id to sid lookup function. 
**********************************/

static NTSTATUS idmap_tdb_id_to_sid(struct idmap_domain *dom, struct id_map *map)
{
	NTSTATUS ret;
	TDB_DATA data;
	char *keystr;
	struct idmap_tdb_context *ctx;

	if (!dom || !map) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);

	/* apply filters before checking */
	if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
		DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
				map->xid.id, dom->low_id, dom->high_id));
		return NT_STATUS_NONE_MAPPED;
	}

	switch (map->xid.type) {

	case ID_TYPE_UID:
		keystr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
		break;
		
	case ID_TYPE_GID:
		keystr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
		break;

	default:
		DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* final SAFE_FREE safe */
	data.dptr = NULL;

	if (keystr == NULL) {
		DEBUG(0, ("Out of memory!\n"));
		ret = NT_STATUS_NO_MEMORY;
		goto done;
	}

	DEBUG(10,("Fetching record %s\n", keystr));

	/* Check if the mapping exists */
	data = dbwrap_fetch_bystring(ctx->db, NULL, keystr);

	if (!data.dptr) {
		DEBUG(10,("Record %s not found\n", keystr));
		ret = NT_STATUS_NONE_MAPPED;
		goto done;
	}
		
	if (!string_to_sid(map->sid, (const char *)data.dptr)) {
		DEBUG(10,("INVALID SID (%s) in record %s\n",
			(const char *)data.dptr, keystr));
		ret = NT_STATUS_INTERNAL_DB_ERROR;
		goto done;
	}

	DEBUG(10,("Found record %s -> %s\n", keystr, (const char *)data.dptr));
	ret = NT_STATUS_OK;

done:
	talloc_free(data.dptr);
	talloc_free(keystr);
	return ret;
}

/**********************************
 Single sid to id lookup function. 
**********************************/

static NTSTATUS idmap_tdb_sid_to_id(struct idmap_domain *dom, struct id_map *map)
{
	NTSTATUS ret;
	TDB_DATA data;
	char *keystr;
	unsigned long rec_id = 0;
	struct idmap_tdb_context *ctx;
	TALLOC_CTX *tmp_ctx = talloc_stackframe();

	ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);

	keystr = sid_string_talloc(tmp_ctx, map->sid);
	if (keystr == NULL) {
		DEBUG(0, ("Out of memory!\n"));
		ret = NT_STATUS_NO_MEMORY;
		goto done;
	}

	DEBUG(10,("Fetching record %s\n", keystr));

	/* Check if sid is present in database */
	data = dbwrap_fetch_bystring(ctx->db, tmp_ctx, keystr);
	if (!data.dptr) {
		DEBUG(10,("Record %s not found\n", keystr));
		ret = NT_STATUS_NONE_MAPPED;
		goto done;
	}

	/* What type of record is this ? */
	if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) { /* Try a UID record. */
		map->xid.id = rec_id;
		map->xid.type = ID_TYPE_UID;
		DEBUG(10,("Found uid record %s -> %s \n", keystr, (const char *)data.dptr ));
		ret = NT_STATUS_OK;

	} else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) { /* Try a GID record. */
		map->xid.id = rec_id;
		map->xid.type = ID_TYPE_GID;
		DEBUG(10,("Found gid record %s -> %s \n", keystr, (const char *)data.dptr ));
		ret = NT_STATUS_OK;

	} else { /* Unknown record type ! */
		DEBUG(2, ("Found INVALID record %s -> %s\n", keystr, (const char *)data.dptr));
		ret = NT_STATUS_INTERNAL_DB_ERROR;
		goto done;
	}

	/* apply filters before returning result */
	if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
		DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
				map->xid.id, dom->low_id, dom->high_id));
		ret = NT_STATUS_NONE_MAPPED;
	}

done:
	talloc_free(tmp_ctx);
	return ret;
}

/**********************************
 lookup a set of unix ids. 
**********************************/

static NTSTATUS idmap_tdb_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
{
	struct idmap_tdb_context *ctx;
	NTSTATUS ret;
	int i;

	/* initialize the status to avoid suprise */
	for (i = 0; ids[i]; i++) {
		ids[i]->status = ID_UNKNOWN;
	}
	
	ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);

	for (i = 0; ids[i]; i++) {
		ret = idmap_tdb_id_to_sid(dom, ids[i]);
		if ( ! NT_STATUS_IS_OK(ret)) {

			/* if it is just a failed mapping continue */
			if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {

				/* make sure it is marked as unmapped */
				ids[i]->status = ID_UNMAPPED;
				continue;
			}
			
			/* some fatal error occurred, return immediately */
			goto done;
		}

		/* all ok, id is mapped */
		ids[i]->status = ID_MAPPED;
	}

	ret = NT_STATUS_OK;

done:
	return ret;
}

/**********************************
 lookup a set of sids. 
**********************************/

struct idmap_tdb_sids_to_unixids_context {
	struct idmap_domain *dom;
	struct id_map **ids;
	bool allocate_unmapped;
};

static NTSTATUS idmap_tdb_sids_to_unixids_action(struct db_context *db,
						 void *private_data)
{
	struct idmap_tdb_sids_to_unixids_context *state;
	int i;
	NTSTATUS ret = NT_STATUS_OK;

	state = (struct idmap_tdb_sids_to_unixids_context *)private_data;

	DEBUG(10, ("idmap_tdb_sids_to_unixids_action: "
		   " domain: [%s], allocate: %s\n",
		   state->dom->name,
		   state->allocate_unmapped ? "yes" : "no"));

	for (i = 0; state->ids[i]; i++) {
		if ((state->ids[i]->status == ID_UNKNOWN) ||
		    /* retry if we could not map in previous run: */
		    (state->ids[i]->status == ID_UNMAPPED))
		{
			NTSTATUS ret2;

			ret2 = idmap_tdb_sid_to_id(state->dom, state->ids[i]);
			if (!NT_STATUS_IS_OK(ret2)) {

				/* if it is just a failed mapping, continue */
				if (NT_STATUS_EQUAL(ret2, NT_STATUS_NONE_MAPPED)) {

					/* make sure it is marked as unmapped */
					state->ids[i]->status = ID_UNMAPPED;
					ret = STATUS_SOME_UNMAPPED;
				} else {
					/* some fatal error occurred, return immediately */
					ret = ret2;
					goto done;
				}
			} else {
				/* all ok, id is mapped */
				state->ids[i]->status = ID_MAPPED;
			}
		}

		if ((state->ids[i]->status == ID_UNMAPPED) &&
		    state->allocate_unmapped)
		{
			ret = idmap_tdb_new_mapping(state->dom, state->ids[i]);
			if (!NT_STATUS_IS_OK(ret)) {
				goto done;
			}
		}
	}

done:
	return ret;
}

static NTSTATUS idmap_tdb_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
{
	struct idmap_tdb_context *ctx;
	NTSTATUS ret;
	int i;
	struct idmap_tdb_sids_to_unixids_context state;

	/* initialize the status to avoid suprise */
	for (i = 0; ids[i]; i++) {
		ids[i]->status = ID_UNKNOWN;
	}
	
	ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);

	state.dom = dom;
	state.ids = ids;
	state.allocate_unmapped = false;

	ret = idmap_tdb_sids_to_unixids_action(ctx->db, &state);

	if (NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED) && !dom->read_only) {
		state.allocate_unmapped = true;
		ret = dbwrap_trans_do(ctx->db,
				      idmap_tdb_sids_to_unixids_action,
				      &state);
	}

	return ret;
}


/**********************************
 Close the idmap tdb instance
**********************************/

static NTSTATUS idmap_tdb_close(struct idmap_domain *dom)
{
	struct idmap_tdb_context *ctx;

	if (dom->private_data) {
		ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);

		TALLOC_FREE(ctx->db);
	}
	return NT_STATUS_OK;
}

static struct idmap_methods db_methods = {
	.init = idmap_tdb_db_init,
	.unixids_to_sids = idmap_tdb_unixids_to_sids,
	.sids_to_unixids = idmap_tdb_sids_to_unixids,
	.allocate_id = idmap_tdb_get_new_id,
	.close_fn = idmap_tdb_close
};

NTSTATUS idmap_tdb_init(void)
{
	DEBUG(10, ("calling idmap_tdb_init\n"));

	return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_methods);
}