summaryrefslogtreecommitdiff
path: root/lib/ldb/common/ldb_match.c
blob: 5eee02dea31197a7e146a666a9af28dd6c30f43a (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  2004-2005
   Copyright (C) Simo Sorce            2005

     ** 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 expression matching
 *
 *  Description: ldb expression matching 
 *
 *  Author: Andrew Tridgell
 */

#include "ldb_private.h"

/*
  check if the scope matches in a search result
*/
static int ldb_match_scope(struct ldb_context *ldb,
			   struct ldb_dn *base,
			   struct ldb_dn *dn,
			   enum ldb_scope scope)
{
	int ret = 0;

	if (base == NULL || dn == NULL) {
		return 1;
	}

	switch (scope) {
	case LDB_SCOPE_BASE:
		if (ldb_dn_compare(base, dn) == 0) {
			ret = 1;
		}
		break;

	case LDB_SCOPE_ONELEVEL:
		if (ldb_dn_get_comp_num(dn) == (ldb_dn_get_comp_num(base) + 1)) {
			if (ldb_dn_compare_base(base, dn) == 0) {
				ret = 1;
			}
		}
		break;
		
	case LDB_SCOPE_SUBTREE:
	default:
		if (ldb_dn_compare_base(base, dn) == 0) {
			ret = 1;
		}
		break;
	}

	return ret;
}


/*
  match if node is present
*/
static int ldb_match_present(struct ldb_context *ldb, 
			     const struct ldb_message *msg,
			     const struct ldb_parse_tree *tree,
			     enum ldb_scope scope, bool *matched)
{
	const struct ldb_schema_attribute *a;
	struct ldb_message_element *el;

	if (ldb_attr_dn(tree->u.present.attr) == 0) {
		*matched = true;
		return LDB_SUCCESS;
	}

	el = ldb_msg_find_element(msg, tree->u.present.attr);
	if (el == NULL) {
		*matched = false;
		return LDB_SUCCESS;
	}

	a = ldb_schema_attribute_by_name(ldb, el->name);
	if (!a) {
		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
	}

	if (a->syntax->operator_fn) {
		unsigned int i;
		for (i = 0; i < el->num_values; i++) {
			int ret = a->syntax->operator_fn(ldb, LDB_OP_PRESENT, a, &el->values[i], NULL, matched);
			if (ret != LDB_SUCCESS) return ret;
			if (*matched) return LDB_SUCCESS;
		}
		*matched = false;
		return LDB_SUCCESS;
	}

	*matched = true;
	return LDB_SUCCESS;
}

static int ldb_match_comparison(struct ldb_context *ldb, 
				const struct ldb_message *msg,
				const struct ldb_parse_tree *tree,
				enum ldb_scope scope,
				enum ldb_parse_op comp_op, bool *matched)
{
	unsigned int i;
	struct ldb_message_element *el;
	const struct ldb_schema_attribute *a;

	/* FIXME: APPROX comparison not handled yet */
	if (comp_op == LDB_OP_APPROX) {
		return LDB_ERR_INAPPROPRIATE_MATCHING;
	}

	el = ldb_msg_find_element(msg, tree->u.comparison.attr);
	if (el == NULL) {
		*matched = false;
		return LDB_SUCCESS;
	}

	a = ldb_schema_attribute_by_name(ldb, el->name);
	if (!a) {
		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
	}

	for (i = 0; i < el->num_values; i++) {
		if (a->syntax->operator_fn) {
			int ret;
			ret = a->syntax->operator_fn(ldb, comp_op, a, &el->values[i], &tree->u.comparison.value, matched);
			if (ret != LDB_SUCCESS) return ret;
			if (*matched) return LDB_SUCCESS;
		} else {
			int ret = a->syntax->comparison_fn(ldb, ldb, &el->values[i], &tree->u.comparison.value);

			if (ret == 0) {
				*matched = true;
				return LDB_SUCCESS;
			}
			if (ret > 0 && comp_op == LDB_OP_GREATER) {
				*matched = true;
				return LDB_SUCCESS;
			}
			if (ret < 0 && comp_op == LDB_OP_LESS) {
				*matched = true;
				return LDB_SUCCESS;
			}
		}
	}

	*matched = false;
	return LDB_SUCCESS;
}

/*
  match a simple leaf node
*/
static int ldb_match_equality(struct ldb_context *ldb, 
			      const struct ldb_message *msg,
			      const struct ldb_parse_tree *tree,
			      enum ldb_scope scope,
			      bool *matched)
{
	unsigned int i;
	struct ldb_message_element *el;
	const struct ldb_schema_attribute *a;
	struct ldb_dn *valuedn;
	int ret;

	if (ldb_attr_dn(tree->u.equality.attr) == 0) {
		valuedn = ldb_dn_from_ldb_val(ldb, ldb, &tree->u.equality.value);
		if (valuedn == NULL) {
			return LDB_ERR_INVALID_DN_SYNTAX;
		}

		ret = ldb_dn_compare(msg->dn, valuedn);

		talloc_free(valuedn);

		*matched = (ret == 0);
		return LDB_SUCCESS;
	}

	/* TODO: handle the "*" case derived from an extended search
	   operation without the attibute type defined */
	el = ldb_msg_find_element(msg, tree->u.equality.attr);
	if (el == NULL) {
		*matched = false;
		return LDB_SUCCESS;
	}

	a = ldb_schema_attribute_by_name(ldb, el->name);
	if (a == NULL) {
		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
	}

	for (i=0;i<el->num_values;i++) {
		if (a->syntax->operator_fn) {
			ret = a->syntax->operator_fn(ldb, LDB_OP_EQUALITY, a,
						     &tree->u.equality.value, &el->values[i], matched);
			if (ret != LDB_SUCCESS) return ret;
			if (*matched) return LDB_SUCCESS;
		} else {
			if (a->syntax->comparison_fn(ldb, ldb, &tree->u.equality.value,
						     &el->values[i]) == 0) {
				*matched = true;
				return LDB_SUCCESS;
			}
		}
	}

	*matched = false;
	return LDB_SUCCESS;
}

static int ldb_wildcard_compare(struct ldb_context *ldb,
				const struct ldb_parse_tree *tree,
				const struct ldb_val value, bool *matched)
{
	const struct ldb_schema_attribute *a;
	struct ldb_val val;
	struct ldb_val cnk;
	struct ldb_val *chunk;
	char *p, *g;
	uint8_t *save_p = NULL;
	unsigned int c = 0;

	a = ldb_schema_attribute_by_name(ldb, tree->u.substring.attr);
	if (!a) {
		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
	}

	if (a->syntax->canonicalise_fn(ldb, ldb, &value, &val) != 0) {
		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
	}

	save_p = val.data;
	cnk.data = NULL;

	if ( ! tree->u.substring.start_with_wildcard ) {

		chunk = tree->u.substring.chunks[c];
		if (a->syntax->canonicalise_fn(ldb, ldb, chunk, &cnk) != 0) goto mismatch;

		/* This deals with wildcard prefix searches on binary attributes (eg objectGUID) */
		if (cnk.length > val.length) {
			goto mismatch;
		}
		if (memcmp((char *)val.data, (char *)cnk.data, cnk.length) != 0) goto mismatch;
		val.length -= cnk.length;
		val.data += cnk.length;
		c++;
		talloc_free(cnk.data);
		cnk.data = NULL;
	}

	while (tree->u.substring.chunks[c]) {

		chunk = tree->u.substring.chunks[c];
		if(a->syntax->canonicalise_fn(ldb, ldb, chunk, &cnk) != 0) goto mismatch;

		/* FIXME: case of embedded nulls */
		p = strstr((char *)val.data, (char *)cnk.data);
		if (p == NULL) goto mismatch;
		if ( (! tree->u.substring.chunks[c + 1]) && (! tree->u.substring.end_with_wildcard) ) {
			do { /* greedy */
				g = strstr((char *)p + cnk.length, (char *)cnk.data);
				if (g) p = g;
			} while(g);
		}
		val.length = val.length - (p - (char *)(val.data)) - cnk.length;
		val.data = (uint8_t *)(p + cnk.length);
		c++;
		talloc_free(cnk.data);
		cnk.data = NULL;
	}

	/* last chunk may not have reached end of string */
	if ( (! tree->u.substring.end_with_wildcard) && (*(val.data) != 0) ) goto mismatch;
	talloc_free(save_p);
	*matched = true;
	return LDB_SUCCESS;

mismatch:
	*matched = false;
	talloc_free(save_p);
	talloc_free(cnk.data);
	return LDB_SUCCESS;
}

/*
  match a simple leaf node
*/
static int ldb_match_substring(struct ldb_context *ldb, 
			       const struct ldb_message *msg,
			       const struct ldb_parse_tree *tree,
			       enum ldb_scope scope, bool *matched)
{
	unsigned int i;
	struct ldb_message_element *el;

	el = ldb_msg_find_element(msg, tree->u.substring.attr);
	if (el == NULL) {
		*matched = false;
		return LDB_SUCCESS;
	}

	for (i = 0; i < el->num_values; i++) {
		int ret;
		ret = ldb_wildcard_compare(ldb, tree, el->values[i], matched);
		if (ret != LDB_SUCCESS) return ret;
		if (*matched) return LDB_SUCCESS;
	}

	*matched = false;
	return LDB_SUCCESS;
}


/*
  bitwise-and comparator
*/
static int ldb_comparator_bitmask(const char *oid, const struct ldb_val *v1, const struct ldb_val *v2,
				  bool *matched)
{
	uint64_t i1, i2;
	char ibuf[100];
	char *endptr = NULL;

	if (v1->length >= sizeof(ibuf)-1) {
		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
	}
	memcpy(ibuf, (char *)v1->data, v1->length);
	ibuf[v1->length] = 0;
	i1 = strtoull(ibuf, &endptr, 0);
	if (endptr != NULL) {
		if (endptr == ibuf || *endptr != 0) {
			return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
		}
	}

	if (v2->length >= sizeof(ibuf)-1) {
		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
	}
	endptr = NULL;
	memcpy(ibuf, (char *)v2->data, v2->length);
	ibuf[v2->length] = 0;
	i2 = strtoull(ibuf, &endptr, 0);
	if (endptr != NULL) {
		if (endptr == ibuf || *endptr != 0) {
			return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
		}
	}
	if (strcmp(LDB_OID_COMPARATOR_AND, oid) == 0) {
		*matched = ((i1 & i2) == i2);
	} else if (strcmp(LDB_OID_COMPARATOR_OR, oid) == 0) {
		*matched = ((i1 & i2) != 0);
	} else {
		return LDB_ERR_INAPPROPRIATE_MATCHING;
	}
	return LDB_SUCCESS;
}

/*
  always return false
*/
static int ldb_comparator_false(const char *oid, const struct ldb_val *v1, const struct ldb_val *v2,
				bool *matched)
{
	*matched = false;
	return LDB_SUCCESS;
}


/*
  extended match, handles things like bitops
*/
static int ldb_match_extended(struct ldb_context *ldb, 
			      const struct ldb_message *msg,
			      const struct ldb_parse_tree *tree,
			      enum ldb_scope scope, bool *matched)
{
	unsigned int i;
	const struct {
		const char *oid;
		int (*comparator)(const char *, const struct ldb_val *, const struct ldb_val *, bool *);
	} rules[] = {
		{ LDB_OID_COMPARATOR_AND, ldb_comparator_bitmask},
		{ LDB_OID_COMPARATOR_OR, ldb_comparator_bitmask},
		{ SAMBA_LDAP_MATCH_ALWAYS_FALSE, ldb_comparator_false}
	};
	int (*comp)(const char *,const struct ldb_val *, const struct ldb_val *, bool *) = NULL;
	struct ldb_message_element *el;

	if (tree->u.extended.dnAttributes) {
		/* FIXME: We really need to find out what this ":dn" part in
		 * an extended match means and how to handle it. For now print
		 * only a warning to have s3 winbind and other tools working
		 * against us. - Matthias */
		ldb_debug(ldb, LDB_DEBUG_WARNING, "ldb: dnAttributes extended match not supported yet");
	}
	if (tree->u.extended.rule_id == NULL) {
		ldb_debug(ldb, LDB_DEBUG_ERROR, "ldb: no-rule extended matches not supported yet");
		return LDB_ERR_INAPPROPRIATE_MATCHING;
	}
	if (tree->u.extended.attr == NULL) {
		ldb_debug(ldb, LDB_DEBUG_ERROR, "ldb: no-attribute extended matches not supported yet");
		return LDB_ERR_INAPPROPRIATE_MATCHING;
	}

	for (i=0;i<ARRAY_SIZE(rules);i++) {
		if (strcmp(rules[i].oid, tree->u.extended.rule_id) == 0) {
			comp = rules[i].comparator;
			break;
		}
	}
	if (comp == NULL) {
		ldb_debug(ldb, LDB_DEBUG_ERROR, "ldb: unknown extended rule_id %s",
			  tree->u.extended.rule_id);
		return LDB_ERR_INAPPROPRIATE_MATCHING;
	}

	/* find the message element */
	el = ldb_msg_find_element(msg, tree->u.extended.attr);
	if (el == NULL) {
		*matched = false;
		return LDB_SUCCESS;
	}

	for (i=0;i<el->num_values;i++) {
		int ret = comp(tree->u.extended.rule_id, &el->values[i], &tree->u.extended.value, matched);
		if (ret != LDB_SUCCESS) return ret;
		if (*matched) return LDB_SUCCESS;
	}

	*matched = false;
	return LDB_SUCCESS;
}

/*
  return 0 if the given parse tree matches the given message. Assumes
  the message is in sorted order

  return 1 if it matches, and 0 if it doesn't match

  this is a recursive function, and does short-circuit evaluation
 */
static int ldb_match_message(struct ldb_context *ldb, 
			     const struct ldb_message *msg,
			     const struct ldb_parse_tree *tree,
			     enum ldb_scope scope, bool *matched)
{
	unsigned int i;
	int ret;

	*matched = false;

	if (scope != LDB_SCOPE_BASE && ldb_dn_is_special(msg->dn)) {
		/* don't match special records except on base searches */
		return LDB_SUCCESS;
	}

	switch (tree->operation) {
	case LDB_OP_AND:
		for (i=0;i<tree->u.list.num_elements;i++) {
			ret = ldb_match_message(ldb, msg, tree->u.list.elements[i], scope, matched);
			if (ret != LDB_SUCCESS) return ret;
			if (!*matched) return LDB_SUCCESS;
		}
		*matched = true;
		return LDB_SUCCESS;

	case LDB_OP_OR:
		for (i=0;i<tree->u.list.num_elements;i++) {
			ret = ldb_match_message(ldb, msg, tree->u.list.elements[i], scope, matched);
			if (ret != LDB_SUCCESS) return ret;
			if (*matched) return LDB_SUCCESS;
		}
		*matched = false;
		return LDB_SUCCESS;

	case LDB_OP_NOT:
		ret = ldb_match_message(ldb, msg, tree->u.isnot.child, scope, matched);
		if (ret != LDB_SUCCESS) return ret;
		*matched = ! *matched;
		return LDB_SUCCESS;

	case LDB_OP_EQUALITY:
		return ldb_match_equality(ldb, msg, tree, scope, matched);

	case LDB_OP_SUBSTRING:
		return ldb_match_substring(ldb, msg, tree, scope, matched);

	case LDB_OP_GREATER:
		return ldb_match_comparison(ldb, msg, tree, scope, LDB_OP_GREATER, matched);

	case LDB_OP_LESS:
		return ldb_match_comparison(ldb, msg, tree, scope, LDB_OP_LESS, matched);

	case LDB_OP_PRESENT:
		return ldb_match_present(ldb, msg, tree, scope, matched);

	case LDB_OP_APPROX:
		return ldb_match_comparison(ldb, msg, tree, scope, LDB_OP_APPROX, matched);

	case LDB_OP_EXTENDED:
		return ldb_match_extended(ldb, msg, tree, scope, matched);
	}

	return LDB_ERR_INAPPROPRIATE_MATCHING;
}

int ldb_match_msg(struct ldb_context *ldb,
		  const struct ldb_message *msg,
		  const struct ldb_parse_tree *tree,
		  struct ldb_dn *base,
		  enum ldb_scope scope)
{
	bool matched;
	int ret;

	if ( ! ldb_match_scope(ldb, base, msg->dn, scope) ) {
		return 0;
	}

	ret = ldb_match_message(ldb, msg, tree, scope, &matched);
	if (ret != LDB_SUCCESS) {
		/* to match the old API, we need to consider this a
		   failure to match */
		return 0;
	}
	return matched?1:0;
}

int ldb_match_msg_error(struct ldb_context *ldb,
			const struct ldb_message *msg,
			const struct ldb_parse_tree *tree,
			struct ldb_dn *base,
			enum ldb_scope scope,
			bool *matched)
{
	if ( ! ldb_match_scope(ldb, base, msg->dn, scope) ) {
		*matched = false;
		return LDB_SUCCESS;
	}

	return ldb_match_message(ldb, msg, tree, scope, matched);
}

int ldb_match_msg_objectclass(const struct ldb_message *msg,
			      const char *objectclass)
{
	unsigned int i;
	struct ldb_message_element *el = ldb_msg_find_element(msg, "objectClass");
	if (!el) {
		return 0;
	}
	for (i=0; i < el->num_values; i++) {
		if (ldb_attr_cmp((const char *)el->values[i].data, objectclass) == 0) {
			return 1;
		}
	}
	return 0;
}