summaryrefslogtreecommitdiff
path: root/source4/lib/ldb/ldb_tdb/ldb_search.c
blob: 08ccc7933d9261fe7f354507a991c5d5f243b6b0 (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
/* 
   ldb database library

   Copyright (C) Andrew Tridgell  2004

     ** NOTE! The following LGPL license applies to the ldb
     ** library. This does NOT imply that all of Samba is released
     ** under the LGPL
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/

/*
 *  Name: ldb
 *
 *  Component: ldb search functions
 *
 *  Description: functions to search ldb+tdb databases
 *
 *  Author: Andrew Tridgell
 */

#include "ldb_tdb.h"

/*
  add one element to a message
*/
static int msg_add_element(struct ldb_message *ret, 
			   const struct ldb_message_element *el,
			   int check_duplicates)
{
	unsigned int i;
	struct ldb_message_element *e2, *elnew;

	if (check_duplicates && ldb_msg_find_element(ret, el->name)) {
		/* its already there */
		return 0;
	}

	e2 = talloc_realloc(ret, ret->elements, struct ldb_message_element, ret->num_elements+1);
	if (!e2) {
		return -1;
	}
	ret->elements = e2;
	
	elnew = &e2[ret->num_elements];

	elnew->name = talloc_strdup(ret->elements, el->name);
	if (!elnew->name) {
		return -1;
	}

	if (el->num_values) {
		elnew->values = talloc_array(ret->elements, struct ldb_val, el->num_values);
		if (!elnew->values) {
			return -1;
		}
	} else {
		elnew->values = NULL;
	}

	for (i=0;i<el->num_values;i++) {
		elnew->values[i] = ldb_val_dup(elnew->values, &el->values[i]);
		if (elnew->values[i].length != el->values[i].length) {
			return -1;
		}
	}

	elnew->num_values = el->num_values;

	ret->num_elements++;

	return 0;
}

/*
  add the special distinguishedName element
*/
static int msg_add_distinguished_name(struct ldb_message *msg)
{
	struct ldb_message_element el;
	struct ldb_val val;
	int ret;

	el.flags = 0;
	el.name = "distinguishedName";
	el.num_values = 1;
	el.values = &val;
	val.data = (uint8_t *)ldb_dn_alloc_linearized(msg, msg->dn);
	val.length = strlen((char *)val.data);
	
	ret = msg_add_element(msg, &el, 1);
	return ret;
}

/*
  add all elements from one message into another
 */
static int msg_add_all_elements(struct ldb_module *module, struct ldb_message *ret,
				const struct ldb_message *msg)
{
	struct ldb_context *ldb;
	unsigned int i;
	int check_duplicates = (ret->num_elements != 0);

	ldb = ldb_module_get_ctx(module);

	if (msg_add_distinguished_name(ret) != 0) {
		return -1;
	}

	for (i=0;i<msg->num_elements;i++) {
		const struct ldb_schema_attribute *a;
		a = ldb_schema_attribute_by_name(ldb, msg->elements[i].name);
		if (a->flags & LDB_ATTR_FLAG_HIDDEN) {
			continue;
		}
		if (msg_add_element(ret, &msg->elements[i],
				    check_duplicates) != 0) {
			return -1;
		}
	}

	return 0;
}


/*
  pull the specified list of attributes from a message
 */
static struct ldb_message *ltdb_pull_attrs(struct ldb_module *module, 
					   TALLOC_CTX *mem_ctx, 
					   const struct ldb_message *msg, 
					   const char * const *attrs)
{
	struct ldb_message *ret;
	unsigned int i;

	ret = talloc(mem_ctx, struct ldb_message);
	if (!ret) {
		return NULL;
	}

	ret->dn = ldb_dn_copy(ret, msg->dn);
	if (!ret->dn) {
		talloc_free(ret);
		return NULL;
	}

	ret->num_elements = 0;
	ret->elements = NULL;

	if (!attrs) {
		if (msg_add_all_elements(module, ret, msg) != 0) {
			talloc_free(ret);
			return NULL;
		}
		return ret;
	}

	for (i=0;attrs[i];i++) {
		struct ldb_message_element *el;

		if (strcmp(attrs[i], "*") == 0) {
			if (msg_add_all_elements(module, ret, msg) != 0) {
				talloc_free(ret);
				return NULL;
			}
			continue;
		}

		if (ldb_attr_cmp(attrs[i], "distinguishedName") == 0) {
			if (msg_add_distinguished_name(ret) != 0) {
				return NULL;
			}
			continue;
		}

		el = ldb_msg_find_element(msg, attrs[i]);
		if (!el) {
			continue;
		}
		if (msg_add_element(ret, el, 1) != 0) {
			talloc_free(ret);
			return NULL;				
		}
	}

	return ret;
}

/*
  search the database for a single simple dn.
  return LDB_ERR_NO_SUCH_OBJECT on record-not-found
  and LDB_SUCCESS on success
*/
static int ltdb_search_base(struct ldb_module *module, struct ldb_dn *dn)
{
	void *data = ldb_module_get_private(module);
	struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
	TDB_DATA tdb_key, tdb_data;

	if (ldb_dn_is_null(dn)) {
		return LDB_ERR_NO_SUCH_OBJECT;
	}

	/* form the key */
	tdb_key = ltdb_key(module, dn);
	if (!tdb_key.dptr) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	tdb_data = tdb_fetch(ltdb->tdb, tdb_key);
	talloc_free(tdb_key.dptr);
	if (!tdb_data.dptr) {
		return LDB_ERR_NO_SUCH_OBJECT;
	}
	
	free(tdb_data.dptr);
	return LDB_SUCCESS;
}

/*
  search the database for a single simple dn, returning all attributes
  in a single message

  return LDB_ERR_NO_SUCH_OBJECT on record-not-found
  and LDB_SUCCESS on success
*/
int ltdb_search_dn1(struct ldb_module *module, struct ldb_dn *dn, struct ldb_message *msg)
{
	void *data = ldb_module_get_private(module);
	struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
	int ret;
	TDB_DATA tdb_key, tdb_data;

	memset(msg, 0, sizeof(*msg));

	/* form the key */
	tdb_key = ltdb_key(module, dn);
	if (!tdb_key.dptr) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	tdb_data = tdb_fetch(ltdb->tdb, tdb_key);
	talloc_free(tdb_key.dptr);
	if (!tdb_data.dptr) {
		return LDB_ERR_NO_SUCH_OBJECT;
	}
	
	msg->num_elements = 0;
	msg->elements = NULL;

	ret = ltdb_unpack_data(module, &tdb_data, msg);
	free(tdb_data.dptr);
	if (ret == -1) {
		struct ldb_context *ldb = ldb_module_get_ctx(module);
		ldb_debug(ldb, LDB_DEBUG_ERROR, "Invalid data for index %s\n",
			  ldb_dn_get_linearized(msg->dn));
		return LDB_ERR_OPERATIONS_ERROR;		
	}

	if (!msg->dn) {
		msg->dn = ldb_dn_copy(msg, dn);
	}
	if (!msg->dn) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	return LDB_SUCCESS;
}

/*
  add a set of attributes from a record to a set of results
  return 0 on success, -1 on failure
*/
int ltdb_add_attr_results(struct ldb_module *module, 
			  TALLOC_CTX *mem_ctx, 
			  struct ldb_message *msg,
			  const char * const attrs[], 
			  unsigned int *count, 
			  struct ldb_message ***res)
{
	struct ldb_message *msg2;
	struct ldb_message **res2;

	/* pull the attributes that the user wants */
	msg2 = ltdb_pull_attrs(module, mem_ctx, msg, attrs);
	if (!msg2) {
		return -1;
	}

	/* add to the results list */
	res2 = talloc_realloc(mem_ctx, *res, struct ldb_message *, (*count)+2);
	if (!res2) {
		talloc_free(msg2);
		return -1;
	}

	(*res) = res2;

	(*res)[*count] = talloc_move(*res, &msg2);
	(*res)[(*count)+1] = NULL;
	(*count)++;

	return 0;
}



/*
  filter the specified list of attributes from a message
  removing not requested attrs.
 */
int ltdb_filter_attrs(struct ldb_message *msg, const char * const *attrs)
{
	unsigned int i;
	int keep_all = 0;

	if (attrs) {
		/* check for special attrs */
		for (i = 0; attrs[i]; i++) {
			if (strcmp(attrs[i], "*") == 0) {
				keep_all = 1;
				break;
			}

			if (ldb_attr_cmp(attrs[i], "distinguishedName") == 0) {
				if (msg_add_distinguished_name(msg) != 0) {
					return -1;
				}
			}
		}
	} else {
		keep_all = 1;
	}
	
	if (keep_all) {
		if (msg_add_distinguished_name(msg) != 0) {
			return -1;
		}
		return 0;
	}

	for (i = 0; i < msg->num_elements; i++) {
		unsigned int j;
		int found = 0;
		
		for (j = 0; attrs[j]; j++) {
			if (ldb_attr_cmp(msg->elements[i].name, attrs[j]) == 0) {
				found = 1;
				break;
			}
		}

		if (!found) {
			ldb_msg_remove_attr(msg, msg->elements[i].name);
			i--;
		}
	}

	return 0;
}

/*
  search function for a non-indexed search
 */
static int search_func(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data, void *state)
{
	struct ldb_context *ldb;
	struct ltdb_context *ac;
	struct ldb_message *msg;
	int ret;

	ac = talloc_get_type(state, struct ltdb_context);
	ldb = ldb_module_get_ctx(ac->module);

	if (key.dsize < 4 || 
	    strncmp((char *)key.dptr, "DN=", 3) != 0) {
		return 0;
	}

	msg = ldb_msg_new(ac);
	if (!msg) {
		return -1;
	}

	/* unpack the record */
	ret = ltdb_unpack_data(ac->module, &data, msg);
	if (ret == -1) {
		talloc_free(msg);
		return -1;
	}

	if (!msg->dn) {
		msg->dn = ldb_dn_new(msg, ldb,
				     (char *)key.dptr + 3);
		if (msg->dn == NULL) {
			talloc_free(msg);
			return -1;
		}
	}

	/* see if it matches the given expression */
	if (!ldb_match_msg(ldb, msg,
			   ac->tree, ac->base, ac->scope)) {
		talloc_free(msg);
		return 0;
	}

	/* filter the attributes that the user wants */
	ret = ltdb_filter_attrs(msg, ac->attrs);

	if (ret == -1) {
		talloc_free(msg);
		return -1;
	}

	ret = ldb_module_send_entry(ac->req, msg, NULL);
	if (ret != LDB_SUCCESS) {
		ac->request_terminated = true;
		/* the callback failed, abort the operation */
		return -1;
	}

	return 0;
}


/*
  search the database with a LDAP-like expression.
  this is the "full search" non-indexed variant
*/
static int ltdb_search_full(struct ltdb_context *ctx)
{
	void *data = ldb_module_get_private(ctx->module);
	struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
	int ret;

	if (ltdb->in_transaction != 0) {
		ret = tdb_traverse(ltdb->tdb, search_func, ctx);
	} else {
		ret = tdb_traverse_read(ltdb->tdb, search_func, ctx);
	}

	if (ret == -1) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	return LDB_SUCCESS;
}

/*
  search the database with a LDAP-like expression.
  choses a search method
*/
int ltdb_search(struct ltdb_context *ctx)
{
	struct ldb_context *ldb;
	struct ldb_module *module = ctx->module;
	struct ldb_request *req = ctx->req;
	void *data = ldb_module_get_private(module);
	struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
	int ret;

	ldb = ldb_module_get_ctx(module);

	ldb_request_set_state(req, LDB_ASYNC_PENDING);

	if (ltdb_lock_read(module) != 0) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if (ltdb_cache_load(module) != 0) {
		ltdb_unlock_read(module);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if (req->op.search.tree == NULL) {
		ltdb_unlock_read(module);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if ((req->op.search.base == NULL) || (ldb_dn_is_null(req->op.search.base) == true)) {

		/* Check what we should do with a NULL dn */
		switch (req->op.search.scope) {
		case LDB_SCOPE_BASE:
			ldb_asprintf_errstring(ldb, 
					       "NULL Base DN invalid for a base search");
			ret = LDB_ERR_INVALID_DN_SYNTAX;
			break;
		case LDB_SCOPE_ONELEVEL:
			ldb_asprintf_errstring(ldb, 
					       "NULL Base DN invalid for a one-level search");
			ret = LDB_ERR_INVALID_DN_SYNTAX;	
			break;
		case LDB_SCOPE_SUBTREE:
		default:
			/* We accept subtree searches from a NULL base DN, ie over the whole DB */
			ret = LDB_SUCCESS;
		}
	} else if (ldb_dn_is_valid(req->op.search.base) == false) {

		/* We don't want invalid base DNs here */
		ldb_asprintf_errstring(ldb, 
				       "Invalid Base DN: %s", 
				       ldb_dn_get_linearized(req->op.search.base));
		ret = LDB_ERR_INVALID_DN_SYNTAX;

	} else if (ltdb->check_base) {
		/* This database has been marked as 'checkBaseOnSearch', so do a spot check of the base dn */
		ret = ltdb_search_base(module, req->op.search.base);
		
		if (ret == LDB_ERR_NO_SUCH_OBJECT) {
			ldb_asprintf_errstring(ldb, 
					       "No such Base DN: %s", 
					       ldb_dn_get_linearized(req->op.search.base));
		}
			
	} else {
		/* If we are not checking the base DN life is easy */
		ret = LDB_SUCCESS;
	}

	ctx->tree = req->op.search.tree;
	ctx->scope = req->op.search.scope;
	ctx->base = req->op.search.base;
	ctx->attrs = req->op.search.attrs;

	if (ret == LDB_SUCCESS) {
		uint32_t match_count = 0;

		ret = ltdb_search_indexed(ctx, &match_count);
		if (ret == LDB_ERR_NO_SUCH_OBJECT) {
			/* Not in the index, therefore OK! */
			ret = LDB_SUCCESS;
			
		}
		/* Check if we got just a normal error.
		 * In that case proceed to a full search unless we got a
		 * callback error */
		if ( ! ctx->request_terminated && ret != LDB_SUCCESS) {
			/* Not indexed, so we need to do a full scan */
#if 0
			/* useful for debugging when slow performance
			 * is caused by unindexed searches */
			char *expression = ldb_filter_from_tree(ctx, ctx->tree);
			printf("FULL SEARCH: %s\n", expression);
			talloc_free(expression);
#endif
			if (match_count != 0) {
				/* the indexing code gave an error
				 * after having returned at least one
				 * entry. This means the indexes are
				 * corrupt or a database record is
				 * corrupt. We cannot continue with a
				 * full search or we may return
				 * duplicate entries
				 */
				ltdb_unlock_read(module);
				return LDB_ERR_OPERATIONS_ERROR;
			}
			ret = ltdb_search_full(ctx);
			if (ret != LDB_SUCCESS) {
				ldb_set_errstring(ldb, "Indexed and full searches both failed!\n");
			}
		}
	}

	ltdb_unlock_read(module);

	return ret;
}