summaryrefslogtreecommitdiff
path: root/source3/sam/idmap_ldap.c
blob: 2a94de755ac1da1f9fb1ad740d290d9c12729a3d (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
/*
   Unix SMB/CIFS implementation.

   idmap LDAP backend

   Copyright (C) Tim Potter 		2000
   Copyright (C) Jim McDonough <jmcd@us.ibm.com>	2003
   Copyright (C) Simo Sorce 		2003
   Copyright (C) Gerald Carter 		2003

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_IDMAP


#include <lber.h>
#include <ldap.h>

#include "smbldap.h"

struct ldap_idmap_state {
	struct smbldap_state *smbldap_state;
	TALLOC_CTX *mem_ctx;
};

static struct ldap_idmap_state ldap_state;

/* number tries while allocating new id */
#define LDAP_MAX_ALLOC_ID 128


/***********************************************************************
 This function cannot be called to modify a mapping, only set a new one
***********************************************************************/

static NTSTATUS ldap_set_mapping(const DOM_SID *sid, unid_t id, int id_type)
{
	pstring dn;
	pstring id_str;
	fstring type;
	LDAPMod **mods = NULL;
	int rc = -1;
	int ldap_op;
	fstring sid_string;
	LDAPMessage *entry = NULL;

	sid_to_string( sid_string, sid );

	ldap_op = LDAP_MOD_ADD;
	pstr_sprintf(dn, "%s=%s,%s", get_attr_key2string( sidmap_attr_list, LDAP_ATTR_SID),
		 sid_string, lp_ldap_idmap_suffix());

	if ( id_type & ID_USERID )
		fstrcpy( type, get_attr_key2string( sidmap_attr_list, LDAP_ATTR_UIDNUMBER ) );
	else
		fstrcpy( type, get_attr_key2string( sidmap_attr_list, LDAP_ATTR_GIDNUMBER ) );

	pstr_sprintf(id_str, "%lu", ((id_type & ID_USERID) ? (unsigned long)id.uid :
						 (unsigned long)id.gid));	
	
	smbldap_set_mod( &mods, LDAP_MOD_ADD, "objectClass", LDAP_OBJ_IDMAP_ENTRY );

	smbldap_make_mod( ldap_state.smbldap_state->ldap_struct, 
			  entry, &mods, type, id_str );

	smbldap_make_mod( ldap_state.smbldap_state->ldap_struct,
			  entry, &mods,  
			  get_attr_key2string(sidmap_attr_list, LDAP_ATTR_SID), 
			  sid_string );

	/* There may well be nothing at all to do */

	if (mods) {
		smbldap_set_mod( &mods, LDAP_MOD_ADD, "objectClass", LDAP_OBJ_SID_ENTRY );
		rc = smbldap_add(ldap_state.smbldap_state, dn, mods);
		ldap_mods_free( mods, True );	
	} else {
		rc = LDAP_SUCCESS;
	}

	if (rc != LDAP_SUCCESS) {
		char *ld_error = NULL;
		ldap_get_option(ldap_state.smbldap_state->ldap_struct, LDAP_OPT_ERROR_STRING,
				&ld_error);
		DEBUG(0,("ldap_set_mapping_internals: Failed to %s mapping from %s to %lu [%s]\n",
			 (ldap_op == LDAP_MOD_ADD) ? "add" : "replace",
			 sid_string, (unsigned long)((id_type & ID_USERID) ? id.uid : id.gid), type));
		DEBUG(0, ("ldap_set_mapping_internals: Error was: %s (%s)\n", 
			ld_error ? ld_error : "(NULL)", ldap_err2string (rc)));
		return NT_STATUS_UNSUCCESSFUL;
	}
		
	DEBUG(10,("ldap_set_mapping: Successfully created mapping from %s to %lu [%s]\n",
		sid_string, ((id_type & ID_USERID) ? (unsigned long)id.uid : 
			     (unsigned long)id.gid), type));

	return NT_STATUS_OK;
}

/**********************************************************************
 Even if the sambaDomain attribute in LDAP tells us that this RID is 
 safe to use, always check before use.  
*********************************************************************/

static BOOL sid_in_use(struct ldap_idmap_state *state, 
		       const DOM_SID *sid, int *error) 
{
	fstring filter;
	fstring sid_string;
	LDAPMessage *result = NULL;
	int count;
	int rc;
	char *sid_attr[] = {LDAP_ATTRIBUTE_SID, NULL};

	slprintf(filter, sizeof(filter)-1, "(%s=%s)", LDAP_ATTRIBUTE_SID, sid_to_string(sid_string, sid));

	rc = smbldap_search_suffix(state->smbldap_state, 
				   filter, sid_attr, &result);

	if (rc != LDAP_SUCCESS)	{
		char *ld_error = NULL;
		ldap_get_option(state->smbldap_state->ldap_struct, LDAP_OPT_ERROR_STRING, &ld_error);
		DEBUG(2, ("Failed to check if sid %s is alredy in use: %s\n",
			  sid_string, ld_error));
		SAFE_FREE(ld_error);

		*error = rc;
		return True;
	}
	
	if ((count = ldap_count_entries(state->smbldap_state->ldap_struct, result)) > 0) {
		DEBUG(3, ("Sid %s already in use - trying next RID\n",
			  sid_string));
		ldap_msgfree(result);
		return True;
	}

	ldap_msgfree(result);

	/* good, sid is not in use */
	return False;
}

/**********************************************************************
 Set the new nextRid attribute, and return one we can use.

 This also checks that this RID is actually free - in case the admin
 manually stole it :-).
*********************************************************************/

static NTSTATUS ldap_next_rid(struct ldap_idmap_state *state, uint32 *rid, 
                              int rid_type)
{
	NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
	int rc;
	LDAPMessage *domain_result = NULL;
	LDAPMessage *entry  = NULL;
	char *dn;
	LDAPMod **mods = NULL;
	fstring old_rid_string;
	fstring next_rid_string;
	fstring algorithmic_rid_base_string;
	uint32 next_rid;
	uint32 alg_rid_base;
	int attempts = 0;
	char *ld_error = NULL;

	while (attempts < 10) {
		if (!NT_STATUS_IS_OK(ret = smbldap_search_domain_info(state->smbldap_state, 
				&domain_result, get_global_sam_name(), True))) {
			return ret;
		}
	
		entry = ldap_first_entry(state->smbldap_state->ldap_struct, domain_result);
		if (!entry) {
			DEBUG(0, ("Could not get domain info entry\n"));
			ldap_msgfree(domain_result);
			return ret;
		}

		if ((dn = smbldap_get_dn(state->smbldap_state->ldap_struct, entry)) == NULL) {
			DEBUG(0, ("Could not get domain info DN\n"));
			ldap_msgfree(domain_result);
			return ret;
		}

		/* yes, we keep 3 seperate counters, one for rids between 1000 (BASE_RID) and 
		   algorithmic_rid_base.  The other two are to avoid stomping on the
		   different sets of algorithmic RIDs */
		
		if (smbldap_get_single_attribute(state->smbldap_state->ldap_struct, entry,
					 get_attr_key2string(dominfo_attr_list, LDAP_ATTR_ALGORITHMIC_RID_BASE),
					 algorithmic_rid_base_string)) {
			
			alg_rid_base = (uint32)atol(algorithmic_rid_base_string);
		} else {
			alg_rid_base = algorithmic_rid_base();
			/* Try to make the modification atomically by enforcing the
			   old value in the delete mod. */
			slprintf(algorithmic_rid_base_string, sizeof(algorithmic_rid_base_string)-1, "%d", alg_rid_base);
			smbldap_make_mod(state->smbldap_state->ldap_struct, entry, &mods, 
					 get_attr_key2string(dominfo_attr_list, LDAP_ATTR_ALGORITHMIC_RID_BASE), 
					 algorithmic_rid_base_string);
		}

		next_rid = 0;

		if (alg_rid_base > BASE_RID) {
			/* we have a non-default 'algorithmic rid base', so we have 'low' rids that we 
			   can allocate to new users */
			if (smbldap_get_single_attribute(state->smbldap_state->ldap_struct, entry,
						 get_attr_key2string(dominfo_attr_list, LDAP_ATTR_NEXT_RID),
						 old_rid_string)) {
				*rid = (uint32)atol(old_rid_string);
			} else {
				*rid = BASE_RID;
			}

			next_rid = *rid+1;
			if (next_rid >= alg_rid_base) {
				return NT_STATUS_UNSUCCESSFUL;
			}
			
			slprintf(next_rid_string, sizeof(next_rid_string)-1, "%d", next_rid);
				
			/* Try to make the modification atomically by enforcing the
			   old value in the delete mod. */
			smbldap_make_mod(state->smbldap_state->ldap_struct, entry, &mods, 
					 get_attr_key2string(dominfo_attr_list, LDAP_ATTR_NEXT_RID), 
					 next_rid_string);
		}

		if (!next_rid) { /* not got one already */
			switch (rid_type) {
			case USER_RID_TYPE:
				if (smbldap_get_single_attribute(state->smbldap_state->ldap_struct, entry,
							 get_attr_key2string(dominfo_attr_list, LDAP_ATTR_NEXT_USERRID),
							 old_rid_string)) {
					*rid = (uint32)atol(old_rid_string);					
				}
				break;
			case GROUP_RID_TYPE:
				if (smbldap_get_single_attribute(state->smbldap_state->ldap_struct, entry, 
							 get_attr_key2string(dominfo_attr_list, LDAP_ATTR_NEXT_GROUPRID),
							 old_rid_string)) {
					*rid = (uint32)atol(old_rid_string);
				}
				break;
			}
			
			/* This is the core of the whole routine. If we had
			   scheme-style closures, there would be a *lot* less code
			   duplication... */

			next_rid = *rid+RID_MULTIPLIER;
			slprintf(next_rid_string, sizeof(next_rid_string)-1, "%d", next_rid);
			
			switch (rid_type) {
			case USER_RID_TYPE:
				/* Try to make the modification atomically by enforcing the
				   old value in the delete mod. */
				smbldap_make_mod(state->smbldap_state->ldap_struct, entry, &mods, 
						 get_attr_key2string(dominfo_attr_list, LDAP_ATTR_NEXT_USERRID), 
						 next_rid_string);
				break;
				
			case GROUP_RID_TYPE:
				/* Try to make the modification atomically by enforcing the
				   old value in the delete mod. */
				smbldap_make_mod(state->smbldap_state->ldap_struct, entry, &mods,
						 get_attr_key2string(dominfo_attr_list, LDAP_ATTR_NEXT_GROUPRID),
						 next_rid_string);
				break;
			}
		}

		if ((rc = smbldap_modify(state->smbldap_state, dn, mods)) == LDAP_SUCCESS) {
			DOM_SID dom_sid;
			DOM_SID sid;
			pstring domain_sid_string;
			int error = 0;

			if (!smbldap_get_single_attribute(state->smbldap_state->ldap_struct, domain_result,
					get_attr_key2string(dominfo_attr_list, LDAP_ATTR_DOM_SID),
					domain_sid_string)) {
				ldap_mods_free(mods, True);
				SAFE_FREE(dn);
				ldap_msgfree(domain_result);
				return ret;
			}

			if (!string_to_sid(&dom_sid, domain_sid_string)) { 
				ldap_mods_free(mods, True);
				SAFE_FREE(dn);
				ldap_msgfree(domain_result);
				return ret;
			}

			ldap_mods_free(mods, True);
			mods = NULL;
			SAFE_FREE(dn);
			ldap_msgfree(domain_result);

			sid_copy(&sid, &dom_sid);
			sid_append_rid(&sid, *rid);

			/* check RID is not in use */
			if (sid_in_use(state, &sid, &error)) {
				if (error) {
					return ret;
				}
				continue;
			}

			return NT_STATUS_OK;
		}

		ld_error = NULL;
		ldap_get_option(state->smbldap_state->ldap_struct, LDAP_OPT_ERROR_STRING, &ld_error);
		DEBUG(2, ("Failed to modify rid: %s\n", ld_error ? ld_error : "(NULL"));
		SAFE_FREE(ld_error);

		ldap_mods_free(mods, True);
		mods = NULL;

		SAFE_FREE(dn);

		ldap_msgfree(domain_result);
		domain_result = NULL;

		{
			/* Sleep for a random timeout */
			unsigned sleeptime = (sys_random()*sys_getpid()*attempts);
			attempts += 1;
			
			sleeptime %= 100;
			msleep(sleeptime);
		}
	}

	DEBUG(0, ("Failed to set new RID\n"));
	return ret;
}


/*****************************************************************************
 Allocate a new RID
*****************************************************************************/

static NTSTATUS ldap_allocate_rid(uint32 *rid, int rid_type)
{
	return ldap_next_rid( &ldap_state, rid, rid_type );
}

/*****************************************************************************
 Allocate a new uid or gid
*****************************************************************************/

static NTSTATUS ldap_allocate_id(unid_t *id, int id_type)
{
	NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
	int rc = LDAP_SERVER_DOWN;
	int count = 0;
	LDAPMessage *result = NULL;
	LDAPMessage *entry = NULL;
	pstring id_str, new_id_str;
	LDAPMod **mods = NULL;
	const char *type;
	char *dn;
	char **attr_list;
	pstring filter;
	uid_t	luid, huid;
	gid_t	lgid, hgid;


	type = (id_type & ID_USERID) ?
		get_attr_key2string( idpool_attr_list, LDAP_ATTR_UIDNUMBER ) : 
		get_attr_key2string( idpool_attr_list, LDAP_ATTR_GIDNUMBER );

	pstr_sprintf(filter, "(objectClass=%s)", LDAP_OBJ_IDPOOL);

	attr_list = get_attr_list( idpool_attr_list );

	rc = smbldap_search(ldap_state.smbldap_state, lp_ldap_idmap_suffix(),
			       LDAP_SCOPE_SUBTREE, filter,
			       attr_list, 0, &result);
	free_attr_list( attr_list );
	 
	if (rc != LDAP_SUCCESS) {
		DEBUG(0,("ldap_allocate_id: %s object not found\n", LDAP_OBJ_IDPOOL));
		goto out;
	}
	
	count = ldap_count_entries(ldap_state.smbldap_state->ldap_struct, result);
	if (count != 1) {
		DEBUG(0,("ldap_allocate_id: single %s object not found\n", LDAP_OBJ_IDPOOL));
		goto out;
	}

	dn = smbldap_get_dn(ldap_state.smbldap_state->ldap_struct, result);
	if (!dn) {
		goto out;
	}
	entry = ldap_first_entry(ldap_state.smbldap_state->ldap_struct, result);

	if (!smbldap_get_single_attribute(ldap_state.smbldap_state->ldap_struct, entry, type, id_str)) {
		DEBUG(0,("ldap_allocate_id: %s attribute not found\n",
			 type));
		goto out;
	}

	/* this must succeed or else we wouldn't have initialized */
		
	lp_idmap_uid( &luid, &huid);
	lp_idmap_gid( &lgid, &hgid);
	
	/* make sure we still have room to grow */
	
	if (id_type & ID_USERID) {
		id->uid = strtoul(id_str, NULL, 10);
		if (id->uid > huid ) {
			DEBUG(0,("ldap_allocate_id: Cannot allocate uid above %lu!\n", 
				 (unsigned long)huid));
			goto out;
		}
	}
	else { 
		id->gid = strtoul(id_str, NULL, 10);
		if (id->gid > hgid ) {
			DEBUG(0,("ldap_allocate_id: Cannot allocate gid above %lu!\n", 
				 (unsigned long)hgid));
			goto out;
		}
	}
	
	pstr_sprintf(new_id_str, "%lu", 
		 ((id_type & ID_USERID) ? (unsigned long)id->uid : 
		  (unsigned long)id->gid) + 1);
		 
	smbldap_set_mod( &mods, LDAP_MOD_DELETE, type, id_str );		 
	smbldap_set_mod( &mods, LDAP_MOD_ADD, type, new_id_str );
	
	rc = smbldap_modify(ldap_state.smbldap_state, dn, mods);

	SAFE_FREE(dn);
	ldap_mods_free( mods, True );
	
	if (rc != LDAP_SUCCESS) {
		DEBUG(0,("ldap_allocate_id: Failed to allocate new %s.  ldap_modify() failed.\n",
			type));
		goto out;
	}
	
	ret = NT_STATUS_OK;
out:
	return ret;
}

/*****************************************************************************
 get a sid from an id
*****************************************************************************/

static NTSTATUS ldap_get_sid_from_id(DOM_SID *sid, unid_t id, int id_type)
{
	LDAPMessage *result = NULL;
	LDAPMessage *entry = NULL;
	pstring sid_str;
	pstring filter;
	pstring suffix;
	const char *type;
	int rc;
	int count;
	NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
	char **attr_list;

	if ( id_type & ID_USERID ) 
		type = get_attr_key2string( idpool_attr_list, LDAP_ATTR_UIDNUMBER );
	else 
		type = get_attr_key2string( idpool_attr_list, LDAP_ATTR_GIDNUMBER );

	pstrcpy( suffix, lp_ldap_idmap_suffix() );
	pstr_sprintf(filter, "(&(objectClass=%s)(%s=%lu))",
		LDAP_OBJ_IDMAP_ENTRY, type,  
		((id_type & ID_USERID) ? (unsigned long)id.uid : (unsigned long)id.gid));
		

	DEBUG(5,("ldap_get_sid_from_id: Searching \"%s\"\n", filter ));
		 
	attr_list = get_attr_list( sidmap_attr_list );
	rc = smbldap_search(ldap_state.smbldap_state, suffix, LDAP_SCOPE_SUBTREE, 
		filter, attr_list, 0, &result);

	if (rc != LDAP_SUCCESS) {
		DEBUG(3,("ldap_get_isd_from_id: Failure looking up entry (%s)\n",
			ldap_err2string(rc) ));
		goto out;
	}
			   
	count = ldap_count_entries(ldap_state.smbldap_state->ldap_struct, result);

	if (count != 1) {
		DEBUG(0,("ldap_get_sid_from_id: mapping not found for %s: %lu\n", 
			type, ((id_type & ID_USERID) ? (unsigned long)id.uid : 
			       (unsigned long)id.gid)));
		goto out;
	}
	
	entry = ldap_first_entry(ldap_state.smbldap_state->ldap_struct, result);
	
	if ( !smbldap_get_single_attribute(ldap_state.smbldap_state->ldap_struct, entry, LDAP_ATTRIBUTE_SID, sid_str) )
		goto out;
	   
	if (!string_to_sid(sid, sid_str))
		goto out;

	ret = NT_STATUS_OK;
out:
	free_attr_list( attr_list );	 

	if (result)
		ldap_msgfree(result);

	return ret;
}

/***********************************************************************
 Get an id from a sid 
***********************************************************************/

static NTSTATUS ldap_get_id_from_sid(unid_t *id, int *id_type, const DOM_SID *sid)
{
	LDAPMessage *result = NULL;
	LDAPMessage *entry = NULL;
	pstring sid_str;
	pstring filter;
	pstring id_str;
	const char *suffix;	
	const char *type;
	int rc;
	int count;
	char **attr_list;
	char *dn = NULL;
	NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;

	sid_to_string(sid_str, sid);

	DEBUG(8,("ldap_get_id_from_sid: %s (%s)\n", sid_str,
		(*id_type & ID_GROUPID ? "group" : "user") ));

	suffix = lp_ldap_idmap_suffix();
	pstr_sprintf(filter, "(&(objectClass=%s)(%s=%s))", 
		LDAP_OBJ_IDMAP_ENTRY, LDAP_ATTRIBUTE_SID, sid_str);
			
	if ( *id_type & ID_GROUPID ) 
		type = get_attr_key2string( sidmap_attr_list, LDAP_ATTR_GIDNUMBER );
	else 
		type = get_attr_key2string( sidmap_attr_list, LDAP_ATTR_UIDNUMBER );

	DEBUG(10,("ldap_get_id_from_sid: Searching for \"%s\"\n", filter));

	/* do the search and check for errors */

	attr_list = get_attr_list( sidmap_attr_list );
	rc = smbldap_search(ldap_state.smbldap_state, suffix, LDAP_SCOPE_SUBTREE, 
		filter, attr_list, 0, &result);
			
	if (rc != LDAP_SUCCESS) {
		DEBUG(3,("ldap_get_id_from_sid: Failure looking up idmap entry (%s)\n",
			ldap_err2string(rc) ));
		goto out;
	}
			
	/* check for the number of entries returned */

	count = ldap_count_entries(ldap_state.smbldap_state->ldap_struct, result);
	   
	if ( count > 1 ) {
		DEBUG(0, ("ldap_get_id_from_sid: (2nd) search %s returned [%d] entries!\n",
			filter, count));
		goto out;
	}
	
	/* try to allocate a new id if we still haven't found one */

	if ( !count ) {
		int i;

		if (*id_type & ID_QUERY_ONLY) {
			DEBUG(5,("ldap_get_id_from_sid: No matching entry found and QUERY_ONLY flag set\n"));
			goto out;
		}

		DEBUG(8,("ldap_get_id_from_sid: Allocating new id\n"));
		
		for (i = 0; i < LDAP_MAX_ALLOC_ID; i++) {
			ret = ldap_allocate_id(id, *id_type);
			if ( NT_STATUS_IS_OK(ret) )
				break;
		}
		
		if ( !NT_STATUS_IS_OK(ret) ) {
			DEBUG(0,("ldap_allocate_id: cannot acquire id lock!\n"));
			goto out;
		}

		DEBUG(10,("ldap_get_id_from_sid: Allocated new %cid [%ul]\n",
			(*id_type & ID_GROUPID ? 'g' : 'u'), (uint32)id->uid ));
	
		ret = ldap_set_mapping(sid, *id, *id_type);

		/* all done */

		goto out;
	}

	DEBUG(10,("ldap_get_id_from_sid: success\n"));

	entry = ldap_first_entry(ldap_state.smbldap_state->ldap_struct, result);
	
	dn = smbldap_get_dn(ldap_state.smbldap_state->ldap_struct, result);
	if (!dn)
		goto out;

	DEBUG(10, ("Found mapping entry at dn=%s, looking for %s\n", dn, type));
		
	if ( smbldap_get_single_attribute(ldap_state.smbldap_state->ldap_struct, entry, type, id_str) ) {
		if ( (*id_type & ID_USERID) )
			id->uid = strtoul(id_str, NULL, 10);
		else
			id->gid = strtoul(id_str, NULL, 10);
		
		ret = NT_STATUS_OK;
		goto out;
	}
	
out:
	free_attr_list( attr_list );
	if (result)
		ldap_msgfree(result);
	SAFE_FREE(dn);
	
	return ret;
}

/**********************************************************************
 Verify the sambaUnixIdPool entry in the directiry.  
**********************************************************************/

static NTSTATUS verify_idpool( void )
{
	fstring filter;
	int rc;
	char **attr_list;
	LDAPMessage *result = NULL;
	LDAPMod **mods = NULL;
	int count;
	
	fstr_sprintf( filter, "(objectclass=%s)", LDAP_OBJ_IDPOOL );
	
	attr_list = get_attr_list( idpool_attr_list );
	rc = smbldap_search(ldap_state.smbldap_state, lp_ldap_idmap_suffix(), 
		LDAP_SCOPE_SUBTREE, filter, attr_list, 0, &result);
	free_attr_list ( attr_list );

	if (rc != LDAP_SUCCESS)
		return NT_STATUS_UNSUCCESSFUL;

	count = ldap_count_entries(ldap_state.smbldap_state->ldap_struct, result);

	if ( count > 1 ) {
		DEBUG(0,("ldap_idmap_init: multiple entries returned from %s (base == %s)\n",
			filter, lp_ldap_idmap_suffix() ));
		return NT_STATUS_UNSUCCESSFUL;
	}
	else if (count == 0) {
		uid_t	luid, huid;
		gid_t	lgid, hgid;
		fstring uid_str, gid_str;
		
		if ( !lp_idmap_uid(&luid, &huid) || !lp_idmap_gid( &lgid, &hgid ) ) {
			DEBUG(0,("ldap_idmap_init: idmap uid/gid parameters not specified\n"));
			return NT_STATUS_UNSUCCESSFUL;
		}
		
		fstr_sprintf( uid_str, "%lu", (unsigned long)luid );
		fstr_sprintf( gid_str, "%lu", (unsigned long)lgid );

		smbldap_set_mod( &mods, LDAP_MOD_ADD, "objectClass", LDAP_OBJ_IDPOOL );
		smbldap_set_mod( &mods, LDAP_MOD_ADD, 
			get_attr_key2string(idpool_attr_list, LDAP_ATTR_UIDNUMBER), uid_str );
		smbldap_set_mod( &mods, LDAP_MOD_ADD,
			get_attr_key2string(idpool_attr_list, LDAP_ATTR_GIDNUMBER), gid_str );
		
		rc = smbldap_modify(ldap_state.smbldap_state, lp_ldap_idmap_suffix(), mods);
	}

	return ( rc==LDAP_SUCCESS ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL );
}

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

static NTSTATUS ldap_idmap_init( char *params )
{
	NTSTATUS nt_status;

	ldap_state.mem_ctx = talloc_init("idmap_ldap");
	if (!ldap_state.mem_ctx) {
		return NT_STATUS_NO_MEMORY;
	}

	/* assume location is the only parameter */
	if (!NT_STATUS_IS_OK(nt_status = 
			     smbldap_init(ldap_state.mem_ctx, params, 
					  &ldap_state.smbldap_state))) {
		talloc_destroy(ldap_state.mem_ctx);
		return nt_status;
	}

	/* see if the idmap suffix and sub entries exists */
	
	nt_status = verify_idpool();	
	if ( !NT_STATUS_IS_OK(nt_status) )
		return nt_status;
		
	return NT_STATUS_OK;
}

/*****************************************************************************
 End the LDAP session
*****************************************************************************/

static NTSTATUS ldap_idmap_close(void)
{

	smbldap_free_struct(&(ldap_state).smbldap_state);
	talloc_destroy(ldap_state.mem_ctx);
	
	DEBUG(5,("The connection to the LDAP server was closed\n"));
	/* maybe free the results here --metze */
	
	return NT_STATUS_OK;
}


/* This function doesn't make as much sense in an LDAP world since the calling
   node doesn't really control the ID ranges */
static void ldap_idmap_status(void)
{
	DEBUG(0, ("LDAP IDMAP Status not available\n"));
}

static struct idmap_methods ldap_methods = {
	ldap_idmap_init,
	ldap_allocate_rid,
	ldap_allocate_id,
	ldap_get_sid_from_id,
	ldap_get_id_from_sid,
	ldap_set_mapping,
	ldap_idmap_close,
	ldap_idmap_status

};

NTSTATUS idmap_ldap_init(void)
{
	return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "ldap", &ldap_methods);
}