summaryrefslogtreecommitdiff
path: root/source3/passdb/pdb_tdb.c
blob: ab266515dadabcee1a1199a5111fed08ae41157d (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
/*
 * Unix SMB/CIFS implementation. 
 * SMB parameters and setup
 * Copyright (C) Andrew Tridgell   1992-1998
 * Copyright (C) Simo Sorce        2000-2003
 * Copyright (C) Gerald Carter     2000-2006
 * Copyright (C) Jeremy Allison    2001
 * Copyright (C) Andrew Bartlett   2002
 * Copyright (C) Jim McDonough <jmcd@us.ibm.com> 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 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"

#if 0 /* when made a module use this */

static int tdbsam_debug_level = DBGC_ALL;
#undef DBGC_CLASS
#define DBGC_CLASS tdbsam_debug_level

#else

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_PASSDB

#endif

#define TDBSAM_VERSION	4	/* Most recent TDBSAM version */
#define TDBSAM_VERSION_STRING	"INFO/version"
#define PASSDB_FILE_NAME	"passdb.tdb"
#define USERPREFIX		"USER_"
#define USERPREFIX_LEN		5
#define RIDPREFIX		"RID_"
#define PRIVPREFIX		"PRIV_"
#define NEXT_RID_STRING		"NEXT_RID"

/* GLOBAL TDB SAM CONTEXT */

static struct db_context *db_sam;
static char *tdbsam_filename;

struct tdbsam_convert_state {
	int32_t from;
	bool success;
};

static int tdbsam_convert_one(struct db_record *rec, void *priv)
{
	struct tdbsam_convert_state *state =
		(struct tdbsam_convert_state *)priv;
	struct samu *user;
	TDB_DATA data;
	NTSTATUS status;
	bool ret;

	if (rec->key.dsize < USERPREFIX_LEN) {
		return 0;
	}
	if (strncmp((char *)rec->key.dptr, USERPREFIX, USERPREFIX_LEN) != 0) {
		return 0;
	}

	user = samu_new(talloc_tos());
	if (user == NULL) {
		DEBUG(0,("tdbsam_convert: samu_new() failed!\n"));
		state->success = false;
		return -1;
	}

	DEBUG(10,("tdbsam_convert: Try unpacking a record with (key:%s) "
		  "(version:%d)\n", rec->key.dptr, state->from));

	switch (state->from) {
	case 0:
		ret = init_samu_from_buffer(user, SAMU_BUFFER_V0,
					    (uint8 *)rec->value.dptr,
					    rec->value.dsize);
		break;
	case 1:
		ret = init_samu_from_buffer(user, SAMU_BUFFER_V1,
					    (uint8 *)rec->value.dptr,
					    rec->value.dsize);
		break;
	case 2:
		ret = init_samu_from_buffer(user, SAMU_BUFFER_V2,
					    (uint8 *)rec->value.dptr,
					    rec->value.dsize);
		break;
	case 3:
		ret = init_samu_from_buffer(user, SAMU_BUFFER_V3,
					    (uint8 *)rec->value.dptr,
					    rec->value.dsize);
		break;
	case 4:
		ret = init_samu_from_buffer(user, SAMU_BUFFER_V4,
					    (uint8 *)rec->value.dptr,
					    rec->value.dsize);
		break;
	default:
		/* unknown tdbsam version */
		ret = False;
	}
	if (!ret) {
		DEBUG(0,("tdbsam_convert: Bad struct samu entry returned "
			 "from TDB (key:%s) (version:%d)\n", rec->key.dptr,
			 state->from));
		TALLOC_FREE(user);
		state->success = false;
		return -1;
	}

	data.dsize = init_buffer_from_samu(&data.dptr, user, false);
	TALLOC_FREE(user);

	if (data.dsize == -1) {
		DEBUG(0,("tdbsam_convert: cannot pack the struct samu into "
			 "the new format\n"));
		state->success = false;
		return -1;
	}

	status = rec->store(rec, data, TDB_MODIFY);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Could not store the new record: %s\n",
			  nt_errstr(status)));
		state->success = false;
		return -1;
	}

	return 0;
}

static bool tdbsam_upgrade_next_rid(struct db_context *db)
{
	TDB_CONTEXT *tdb;
	uint32 rid;
	bool ok = false;

	ok = dbwrap_fetch_uint32(db, NEXT_RID_STRING, &rid);
	if (ok) {
		return true;
	}

	tdb = tdb_open_log(state_path("winbindd_idmap.tdb"), 0,
			   TDB_DEFAULT, O_RDONLY, 0644);

	if (tdb) {
		ok = tdb_fetch_uint32(tdb, "RID_COUNTER", &rid);
		if (!ok) {
			rid = BASE_RID;
		}
		tdb_close(tdb);
	} else {
		rid = BASE_RID;
	}

	if (dbwrap_store_uint32(db, NEXT_RID_STRING, rid) != 0) {
		return false;
	}

	return true;
}

static bool tdbsam_convert(struct db_context *db, int32 from)
{
	struct tdbsam_convert_state state;
	int ret;

	state.from = from;
	state.success = true;

	if (db->transaction_start(db) != 0) {
		DEBUG(0, ("Could not start transaction\n"));
		return false;
	}

	if (!tdbsam_upgrade_next_rid(db)) {
		DEBUG(0, ("tdbsam_upgrade_next_rid failed\n"));
		goto cancel;
	}

	ret = db->traverse(db, tdbsam_convert_one, &state);
	if (ret < 0) {
		DEBUG(0, ("traverse failed\n"));
		goto cancel;
	}

	if (!state.success) {
		DEBUG(0, ("Converting records failed\n"));
		goto cancel;
	}

	if (dbwrap_store_int32(db, TDBSAM_VERSION_STRING,
			       TDBSAM_VERSION) != 0) {
		DEBUG(0, ("Could not store tdbsam version\n"));
		goto cancel;
	}

	if (db->transaction_commit(db) != 0) {
		DEBUG(0, ("Could not commit transaction\n"));
		return false;
	}

	return true;

 cancel:
	if (db->transaction_cancel(db) != 0) {
		smb_panic("transaction_cancel failed");
	}

	return false;
}

/*********************************************************************
 Open the tdbsam file based on the absolute path specified.
 Uses a reference count to allow multiple open calls.
*********************************************************************/

static bool tdbsam_open( const char *name )
{
	int32	version;

	/* check if we are already open */

	if ( db_sam ) {
		return true;
	}

	/* Try to open tdb passwd.  Create a new one if necessary */

	db_sam = db_open(NULL, name, 0, TDB_DEFAULT, O_CREAT|O_RDWR, 0600);
	if (db_sam == NULL) {
		DEBUG(0, ("tdbsam_open: Failed to open/create TDB passwd "
			  "[%s]\n", name));
		return false;
	}

	/* Check the version */
	version = dbwrap_fetch_int32(db_sam, TDBSAM_VERSION_STRING);
	if (version == -1) {
		version = 0;	/* Version not found, assume version 0 */
	}

	/* Compare the version */
	if (version > TDBSAM_VERSION) {
		/* Version more recent than the latest known */
		DEBUG(0, ("tdbsam_open: unknown version => %d\n", version));
		TALLOC_FREE(db_sam);
		return false;
	}

	if ( version < TDBSAM_VERSION ) {
		DEBUG(1, ("tdbsam_open: Converting version %d database to "
			  "version %d.\n", version, TDBSAM_VERSION));

		if ( !tdbsam_convert(db_sam, version) ) {
			DEBUG(0, ("tdbsam_open: Error when trying to convert "
				  "tdbsam [%s]\n",name));
			TALLOC_FREE(db_sam);
			return false;
		}

		DEBUG(3, ("TDBSAM converted successfully.\n"));
	}

	DEBUG(4,("tdbsam_open: successfully opened %s\n", name ));

	return true;
}

/******************************************************************
 Lookup a name in the SAM TDB
******************************************************************/

static NTSTATUS tdbsam_getsampwnam (struct pdb_methods *my_methods,
				    struct samu *user, const char *sname)
{
	TDB_DATA 	data;
	fstring 	keystr;
	fstring		name;

	if ( !user ) {
		DEBUG(0,("pdb_getsampwnam: struct samu is NULL.\n"));
		return NT_STATUS_NO_MEMORY;
	}

	/* Data is stored in all lower-case */
	fstrcpy(name, sname);
	strlower_m(name);

	/* set search key */
	slprintf(keystr, sizeof(keystr)-1, "%s%s", USERPREFIX, name);

	/* open the database */

	if ( !tdbsam_open( tdbsam_filename ) ) {
		DEBUG(0,("tdbsam_getsampwnam: failed to open %s!\n", tdbsam_filename));
		return NT_STATUS_ACCESS_DENIED;
	}

	/* get the record */

	data = dbwrap_fetch_bystring(db_sam, talloc_tos(), keystr);
	if (!data.dptr) {
		DEBUG(5,("pdb_getsampwnam (TDB): error fetching database.\n"));
		DEBUGADD(5, (" Key: %s\n", keystr));
		return NT_STATUS_NO_SUCH_USER;
	}

  	/* unpack the buffer */

	if (!init_samu_from_buffer(user, SAMU_BUFFER_LATEST, data.dptr, data.dsize)) {
		DEBUG(0,("pdb_getsampwent: Bad struct samu entry returned from TDB!\n"));
		SAFE_FREE(data.dptr);
		return NT_STATUS_NO_MEMORY;
	}

	/* success */

	TALLOC_FREE(data.dptr);

	return NT_STATUS_OK;
}

/***************************************************************************
 Search by rid
 **************************************************************************/

static NTSTATUS tdbsam_getsampwrid (struct pdb_methods *my_methods,
				    struct samu *user, uint32 rid)
{
	NTSTATUS                nt_status = NT_STATUS_UNSUCCESSFUL;
	TDB_DATA 		data;
	fstring 		keystr;
	fstring			name;

	if ( !user ) {
		DEBUG(0,("pdb_getsampwrid: struct samu is NULL.\n"));
		return nt_status;
	}

	/* set search key */

	slprintf(keystr, sizeof(keystr)-1, "%s%.8x", RIDPREFIX, rid);

	/* open the database */

	if ( !tdbsam_open( tdbsam_filename ) ) {
		DEBUG(0,("tdbsam_getsampwrid: failed to open %s!\n", tdbsam_filename));
		return NT_STATUS_ACCESS_DENIED;
	}

	/* get the record */

	data = dbwrap_fetch_bystring(db_sam, talloc_tos(), keystr);
	if (!data.dptr) {
		DEBUG(5,("pdb_getsampwrid (TDB): error looking up RID %d by key %s.\n", rid, keystr));
		return NT_STATUS_UNSUCCESSFUL;
	}

	fstrcpy(name, (const char *)data.dptr);
	TALLOC_FREE(data.dptr);

	return tdbsam_getsampwnam (my_methods, user, name);
}

static NTSTATUS tdbsam_getsampwsid(struct pdb_methods *my_methods,
				   struct samu * user, const DOM_SID *sid)
{
	uint32 rid;

	if ( !sid_peek_check_rid(get_global_sam_sid(), sid, &rid) )
		return NT_STATUS_UNSUCCESSFUL;

	return tdbsam_getsampwrid(my_methods, user, rid);
}

static bool tdb_delete_samacct_only( struct samu *sam_pass )
{
	fstring 	keystr;
	fstring		name;
	NTSTATUS status;

	fstrcpy(name, pdb_get_username(sam_pass));
	strlower_m(name);

  	/* set the search key */

	slprintf(keystr, sizeof(keystr)-1, "%s%s", USERPREFIX, name);

	/* it's outaa here!  8^) */
	if ( !tdbsam_open( tdbsam_filename ) ) {
		DEBUG(0,("tdb_delete_samacct_only: failed to open %s!\n",
			 tdbsam_filename));
		return false;
	}

	status = dbwrap_delete_bystring(db_sam, keystr);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(5, ("Error deleting entry from tdb passwd "
			  "database: %s!\n", nt_errstr(status)));
		return false;
	}

	return true;
}

/***************************************************************************
 Delete a struct samu records for the username and RID key
****************************************************************************/

static NTSTATUS tdbsam_delete_sam_account(struct pdb_methods *my_methods,
					  struct samu *sam_pass)
{
	NTSTATUS        nt_status = NT_STATUS_UNSUCCESSFUL;
	fstring 	keystr;
	uint32		rid;
	fstring		name;

	/* open the database */

	if ( !tdbsam_open( tdbsam_filename ) ) {
		DEBUG(0,("tdbsam_delete_sam_account: failed to open %s!\n",
			 tdbsam_filename));
		return NT_STATUS_ACCESS_DENIED;
	}

	fstrcpy(name, pdb_get_username(sam_pass));
	strlower_m(name);

  	/* set the search key */

	slprintf(keystr, sizeof(keystr)-1, "%s%s", USERPREFIX, name);

	rid = pdb_get_user_rid(sam_pass);

	/* it's outaa here!  8^) */

	if (db_sam->transaction_start(db_sam) != 0) {
		DEBUG(0, ("Could not start transaction\n"));
		return NT_STATUS_UNSUCCESSFUL;
	}

	nt_status = dbwrap_delete_bystring(db_sam, keystr);
	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(5, ("Error deleting entry from tdb passwd "
			  "database: %s!\n", nt_errstr(nt_status)));
		goto cancel;
	}

  	/* set the search key */

	slprintf(keystr, sizeof(keystr)-1, "%s%.8x", RIDPREFIX, rid);

	/* it's outaa here!  8^) */

	nt_status = dbwrap_delete_bystring(db_sam, keystr);
	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(5, ("Error deleting entry from tdb rid "
			  "database: %s!\n", nt_errstr(nt_status)));
		goto cancel;
	}

	if (db_sam->transaction_commit(db_sam) != 0) {
		DEBUG(0, ("Could not commit transaction\n"));
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}

	return NT_STATUS_OK;

 cancel:
	if (db_sam->transaction_cancel(db_sam) != 0) {
		smb_panic("transaction_cancel failed");
	}

	return nt_status;
}


/***************************************************************************
 Update the TDB SAM account record only
 Assumes that the tdbsam is already open 
****************************************************************************/
static bool tdb_update_samacct_only( struct samu* newpwd, int flag )
{
	TDB_DATA 	data;
	uint8		*buf = NULL;
	fstring 	keystr;
	fstring		name;
	bool		ret = false;
	NTSTATUS status;

	/* copy the struct samu struct into a BYTE buffer for storage */

	if ( (data.dsize=init_buffer_from_samu(&buf, newpwd, False)) == -1 ) {
		DEBUG(0,("tdb_update_sam: ERROR - Unable to copy struct samu info BYTE buffer!\n"));
		goto done;
	}
	data.dptr = buf;

	fstrcpy(name, pdb_get_username(newpwd));
	strlower_m(name);

	DEBUG(5, ("Storing %saccount %s with RID %d\n",
		  flag == TDB_INSERT ? "(new) " : "", name,
		  pdb_get_user_rid(newpwd)));

  	/* setup the USER index key */
	slprintf(keystr, sizeof(keystr)-1, "%s%s", USERPREFIX, name);

	/* add the account */

	status = dbwrap_store_bystring(db_sam, keystr, data, flag);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Unable to modify passwd TDB: %s!",
			  nt_errstr(status)));
		goto done;
	}

	ret = true;

done:
	/* cleanup */
	SAFE_FREE(buf);
	return ret;
}

/***************************************************************************
 Update the TDB SAM RID record only
 Assumes that the tdbsam is already open
****************************************************************************/
static bool tdb_update_ridrec_only( struct samu* newpwd, int flag )
{
	TDB_DATA 	data;
	fstring 	keystr;
	fstring		name;
	NTSTATUS status;

	fstrcpy(name, pdb_get_username(newpwd));
	strlower_m(name);

	/* setup RID data */
	data = string_term_tdb_data(name);

	/* setup the RID index key */
	slprintf(keystr, sizeof(keystr)-1, "%s%.8x", RIDPREFIX,
		 pdb_get_user_rid(newpwd));

	/* add the reference */
	status = dbwrap_store_bystring(db_sam, keystr, data, flag);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Unable to modify TDB passwd: %s!\n",
			  nt_errstr(status)));
		return false;
	}

	return true;

}

/***************************************************************************
 Update the TDB SAM
****************************************************************************/

static bool tdb_update_sam(struct pdb_methods *my_methods, struct samu* newpwd,
			   int flag)
{
	if (!pdb_get_user_rid(newpwd)) {
		DEBUG(0,("tdb_update_sam: struct samu (%s) with no RID!\n",
			 pdb_get_username(newpwd)));
		return False;
	}

	/* open the database */

	if ( !tdbsam_open( tdbsam_filename ) ) {
		DEBUG(0,("tdbsam_getsampwnam: failed to open %s!\n", tdbsam_filename));
		return False;
	}

	if (db_sam->transaction_start(db_sam) != 0) {
		DEBUG(0, ("Could not start transaction\n"));
		return false;
	}

	if (!tdb_update_samacct_only(newpwd, flag)
	    || !tdb_update_ridrec_only(newpwd, flag)) {
		goto cancel;
	}

	if (db_sam->transaction_commit(db_sam) != 0) {
		DEBUG(0, ("Could not commit transaction\n"));
		return false;
	}

	return true;

 cancel:
	if (db_sam->transaction_cancel(db_sam) != 0) {
		smb_panic("transaction_cancel failed");
	}
	return false;
}

/***************************************************************************
 Modifies an existing struct samu
****************************************************************************/

static NTSTATUS tdbsam_update_sam_account (struct pdb_methods *my_methods, struct samu *newpwd)
{
	if ( !tdb_update_sam(my_methods, newpwd, TDB_MODIFY) )
		return NT_STATUS_UNSUCCESSFUL;
	
	return NT_STATUS_OK;
}

/***************************************************************************
 Adds an existing struct samu
****************************************************************************/

static NTSTATUS tdbsam_add_sam_account (struct pdb_methods *my_methods, struct samu *newpwd)
{
	if ( !tdb_update_sam(my_methods, newpwd, TDB_INSERT) )
		return NT_STATUS_UNSUCCESSFUL;
		
	return NT_STATUS_OK;
}

/***************************************************************************
 Renames a struct samu
 - check for the posix user/rename user script
 - Add and lock the new user record
 - rename the posix user
 - rewrite the rid->username record
 - delete the old user
 - unlock the new user record
***************************************************************************/
static NTSTATUS tdbsam_rename_sam_account(struct pdb_methods *my_methods,
					  struct samu *old_acct,
					  const char *newname)
{
	struct samu      *new_acct = NULL;
	char *rename_script = NULL;
	int              rename_ret;
	fstring          oldname_lower;
	fstring          newname_lower;

	/* can't do anything without an external script */

	if ( !(new_acct = samu_new( talloc_tos() )) ) {
		return NT_STATUS_NO_MEMORY;
	}

	rename_script = talloc_strdup(new_acct, lp_renameuser_script());
	if (!rename_script) {
		TALLOC_FREE(new_acct);
		return NT_STATUS_NO_MEMORY;
	}
	if (!*rename_script) {
		TALLOC_FREE(new_acct);
		return NT_STATUS_ACCESS_DENIED;
	}

	if ( !pdb_copy_sam_account(new_acct, old_acct)
		|| !pdb_set_username(new_acct, newname, PDB_CHANGED))
	{
		TALLOC_FREE(new_acct);
		return NT_STATUS_NO_MEMORY;
	}

	/* open the database */
	if ( !tdbsam_open( tdbsam_filename ) ) {
		DEBUG(0, ("tdbsam_getsampwnam: failed to open %s!\n",
			  tdbsam_filename));
		TALLOC_FREE(new_acct);
		return NT_STATUS_ACCESS_DENIED;
	}

	if (db_sam->transaction_start(db_sam) != 0) {
		DEBUG(0, ("Could not start transaction\n"));
		TALLOC_FREE(new_acct);
		return NT_STATUS_ACCESS_DENIED;

	}

	/* add the new account and lock it */
	if ( !tdb_update_samacct_only(new_acct, TDB_INSERT) ) {
		goto cancel;
	}

	/* Rename the posix user.  Follow the semantics of _samr_create_user()
	   so that we lower case the posix name but preserve the case in passdb */

	fstrcpy( oldname_lower, pdb_get_username(old_acct) );
	strlower_m( oldname_lower );

	fstrcpy( newname_lower, newname );
	strlower_m( newname_lower );

	rename_script = talloc_string_sub2(new_acct,
				rename_script,
				"%unew",
				newname_lower,
				true,
				false,
				true);
	if (!rename_script) {
		goto cancel;
	}
	rename_script = talloc_string_sub2(new_acct,
				rename_script,
				"%uold",
				oldname_lower,
				true,
				false,
				true);
	if (!rename_script) {
		goto cancel;
	}
	rename_ret = smbrun(rename_script, NULL);

	DEBUG(rename_ret ? 0 : 3,("Running the command `%s' gave %d\n",
				rename_script, rename_ret));

	if (rename_ret != 0) {
		goto cancel;
	}

	smb_nscd_flush_user_cache();

	/* rewrite the rid->username record */

	if ( !tdb_update_ridrec_only( new_acct, TDB_MODIFY) ) {
		goto cancel;
	}

	tdb_delete_samacct_only( old_acct );

	if (db_sam->transaction_commit(db_sam) != 0) {
		/*
		 * Ok, we're screwed. We've changed the posix account, but
		 * could not adapt passdb.tdb. Shall we change the posix
		 * account back?
		 */
		DEBUG(0, ("transaction_commit failed\n"));
		TALLOC_FREE(new_acct);
		return NT_STATUS_INTERNAL_DB_CORRUPTION;	
	}

	TALLOC_FREE(new_acct );
	return NT_STATUS_OK;

 cancel:
	if (db_sam->transaction_cancel(db_sam) != 0) {
		smb_panic("transaction_cancel failed");
	}

	TALLOC_FREE(new_acct);

	return NT_STATUS_ACCESS_DENIED;	
}

static bool tdbsam_rid_algorithm(struct pdb_methods *methods)
{
	return False;
}

static bool tdbsam_new_rid(struct pdb_methods *methods, uint32 *prid)
{
	uint32 rid;

	rid = BASE_RID;		/* Default if not set */

	if (!tdbsam_open(tdbsam_filename)) {
		DEBUG(0,("tdbsam_new_rid: failed to open %s!\n",
			tdbsam_filename));
		return false;
	}

	if (dbwrap_change_uint32_atomic(db_sam, NEXT_RID_STRING, &rid, 1) != 0) {
		DEBUG(3, ("tdbsam_new_rid: Failed to increase %s\n",
			NEXT_RID_STRING));
		return false;
	}

	*prid = rid;

	return true;
}

struct tdbsam_search_state {
	struct pdb_methods *methods;
	uint32_t acct_flags;

	uint32_t *rids;
	uint32_t num_rids;
	ssize_t array_size;
	uint32_t current;
};

static int tdbsam_collect_rids(struct db_record *rec, void *private_data)
{
	struct tdbsam_search_state *state = talloc_get_type_abort(
		private_data, struct tdbsam_search_state);
	size_t prefixlen = strlen(RIDPREFIX);
	uint32 rid;

	if ((rec->key.dsize < prefixlen)
	    || (strncmp((char *)rec->key.dptr, RIDPREFIX, prefixlen))) {
		return 0;
	}

	rid = strtoul((char *)rec->key.dptr+prefixlen, NULL, 16);

	ADD_TO_LARGE_ARRAY(state, uint32, rid, &state->rids, &state->num_rids,
			   &state->array_size);

	return 0;
}

static void tdbsam_search_end(struct pdb_search *search)
{
	struct tdbsam_search_state *state = talloc_get_type_abort(
		search->private_data, struct tdbsam_search_state);
	TALLOC_FREE(state);
}

static bool tdbsam_search_next_entry(struct pdb_search *search,
				     struct samr_displayentry *entry)
{
	struct tdbsam_search_state *state = talloc_get_type_abort(
		search->private_data, struct tdbsam_search_state);
	struct samu *user = NULL;
	NTSTATUS status;
	uint32_t rid;

 again:
	TALLOC_FREE(user);
	user = samu_new(talloc_tos());
	if (user == NULL) {
		DEBUG(0, ("samu_new failed\n"));
		return false;
	}

	if (state->current == state->num_rids) {
		return false;
	}

	rid = state->rids[state->current++];

	status = tdbsam_getsampwrid(state->methods, user, rid);

	if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
		/*
		 * Someone has deleted that user since we listed the RIDs
		 */
		goto again;
	}

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10, ("tdbsam_getsampwrid failed: %s\n",
			   nt_errstr(status)));
		TALLOC_FREE(user);
		return false;
	}

	if ((state->acct_flags != 0) &&
	    ((state->acct_flags & pdb_get_acct_ctrl(user)) == 0)) {
		goto again;
	}

	entry->acct_flags = pdb_get_acct_ctrl(user);
	entry->rid = rid;
	entry->account_name = talloc_strdup(search, pdb_get_username(user));
	entry->fullname = talloc_strdup(search, pdb_get_fullname(user));
	entry->description = talloc_strdup(search, pdb_get_acct_desc(user));

	TALLOC_FREE(user);

	if ((entry->account_name == NULL) || (entry->fullname == NULL)
	    || (entry->description == NULL)) {
		DEBUG(0, ("talloc_strdup failed\n"));
		return false;
	}

	return true;
}

static bool tdbsam_search_users(struct pdb_methods *methods,
				struct pdb_search *search,
				uint32 acct_flags)
{
	struct tdbsam_search_state *state;

	if (!tdbsam_open(tdbsam_filename)) {
		DEBUG(0,("tdbsam_getsampwnam: failed to open %s!\n",
			 tdbsam_filename));
		return false;
	}

	state = talloc_zero(search, struct tdbsam_search_state);
	if (state == NULL) {
		DEBUG(0, ("talloc failed\n"));
		return false;
	}
	state->acct_flags = acct_flags;
	state->methods = methods;

	db_sam->traverse_read(db_sam, tdbsam_collect_rids, state);

	search->private_data = state;
	search->next_entry = tdbsam_search_next_entry;
	search->search_end = tdbsam_search_end;

	return true;
}

/*********************************************************************
 Initialize the tdb sam backend.  Setup the dispath table of methods,
 open the tdb, etc...
*********************************************************************/

static NTSTATUS pdb_init_tdbsam(struct pdb_methods **pdb_method, const char *location)
{
	NTSTATUS nt_status;
	char *tdbfile = NULL;
	const char *pfile = location;

	if (!NT_STATUS_IS_OK(nt_status = make_pdb_method( pdb_method ))) {
		return nt_status;
	}

	(*pdb_method)->name = "tdbsam";

	(*pdb_method)->getsampwnam = tdbsam_getsampwnam;
	(*pdb_method)->getsampwsid = tdbsam_getsampwsid;
	(*pdb_method)->add_sam_account = tdbsam_add_sam_account;
	(*pdb_method)->update_sam_account = tdbsam_update_sam_account;
	(*pdb_method)->delete_sam_account = tdbsam_delete_sam_account;
	(*pdb_method)->rename_sam_account = tdbsam_rename_sam_account;
	(*pdb_method)->search_users = tdbsam_search_users;

	(*pdb_method)->rid_algorithm = tdbsam_rid_algorithm;
	(*pdb_method)->new_rid = tdbsam_new_rid;

	/* save the path for later */

	if (!location) {
		if (asprintf(&tdbfile, "%s/%s", lp_private_dir(),
			     PASSDB_FILE_NAME) < 0) {
			return NT_STATUS_NO_MEMORY;
		}
		pfile = tdbfile;
	}
	tdbsam_filename = SMB_STRDUP(pfile);
	if (!tdbsam_filename) {
		return NT_STATUS_NO_MEMORY;
	}
	SAFE_FREE(tdbfile);

	/* no private data */

	(*pdb_method)->private_data      = NULL;
	(*pdb_method)->free_private_data = NULL;

	return NT_STATUS_OK;
}

NTSTATUS pdb_tdbsam_init(void)
{
	return smb_register_passdb(PASSDB_INTERFACE_VERSION, "tdbsam", pdb_init_tdbsam);
}