summaryrefslogtreecommitdiff
path: root/source4/lib/ldb-samba/ldif_handlers.c
blob: 928a06ab43860359fa8fd8ecdbafdac7f0931e77 (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
/* 
   ldb database library - ldif handlers for Samba

   Copyright (C) Andrew Tridgell 2005
   Copyright (C) Andrew Bartlett 2006-2007
     ** 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/>.
*/

#include "includes.h"
#include "ldb_includes.h"
#include "ldb_handlers.h"

#include "librpc/gen_ndr/ndr_security.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "dsdb/samdb/samdb.h"
#include "libcli/security/security.h"

/*
  convert a ldif formatted objectSid to a NDR formatted blob
*/
static int ldif_read_objectSid(struct ldb_context *ldb, void *mem_ctx,
			       const struct ldb_val *in, struct ldb_val *out)
{
	struct dom_sid *sid;
	NTSTATUS status;
	sid = dom_sid_parse_talloc(mem_ctx, (const char *)in->data);
	if (sid == NULL) {
		return -1;
	}
	status = ndr_push_struct_blob(out, mem_ctx, sid, 
				      (ndr_push_flags_fn_t)ndr_push_dom_sid);
	talloc_free(sid);
	if (!NT_STATUS_IS_OK(status)) {
		return -1;
	}
	return 0;
}

/*
  convert a NDR formatted blob to a ldif formatted objectSid
*/
static int ldif_write_objectSid(struct ldb_context *ldb, void *mem_ctx,
				const struct ldb_val *in, struct ldb_val *out)
{
	struct dom_sid *sid;
	NTSTATUS status;
	sid = talloc(mem_ctx, struct dom_sid);
	if (sid == NULL) {
		return -1;
	}
	status = ndr_pull_struct_blob(in, sid, sid, 
				      (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(sid);
		return -1;
	}
	out->data = (uint8_t *)dom_sid_string(mem_ctx, sid);
	talloc_free(sid);
	if (out->data == NULL) {
		return -1;
	}
	out->length = strlen((const char *)out->data);
	return 0;
}

static bool ldb_comparision_objectSid_isString(const struct ldb_val *v)
{
	if (v->length < 3) {
		return false;
	}

	if (strncmp("S-", (const char *)v->data, 2) != 0) return false;
	
	return true;
}

/*
  compare two objectSids
*/
static int ldb_comparison_objectSid(struct ldb_context *ldb, void *mem_ctx,
				    const struct ldb_val *v1, const struct ldb_val *v2)
{
	if (ldb_comparision_objectSid_isString(v1) && ldb_comparision_objectSid_isString(v2)) {
		return strcmp((const char *)v1->data, (const char *)v2->data);
	} else if (ldb_comparision_objectSid_isString(v1)
		   && !ldb_comparision_objectSid_isString(v2)) {
		struct ldb_val v;
		int ret;
		if (ldif_read_objectSid(ldb, mem_ctx, v1, &v) != 0) {
			return -1;
		}
		ret = ldb_comparison_binary(ldb, mem_ctx, &v, v2);
		talloc_free(v.data);
		return ret;
	} else if (!ldb_comparision_objectSid_isString(v1)
		   && ldb_comparision_objectSid_isString(v2)) {
		struct ldb_val v;
		int ret;
		if (ldif_read_objectSid(ldb, mem_ctx, v2, &v) != 0) {
			return -1;
		}
		ret = ldb_comparison_binary(ldb, mem_ctx, v1, &v);
		talloc_free(v.data);
		return ret;
	}
	return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
}

/*
  canonicalise a objectSid
*/
static int ldb_canonicalise_objectSid(struct ldb_context *ldb, void *mem_ctx,
				      const struct ldb_val *in, struct ldb_val *out)
{
	if (ldb_comparision_objectSid_isString(in)) {
		return ldif_read_objectSid(ldb, mem_ctx, in, out);
	}
	return ldb_handler_copy(ldb, mem_ctx, in, out);
}

/*
  convert a ldif formatted objectGUID to a NDR formatted blob
*/
static int ldif_read_objectGUID(struct ldb_context *ldb, void *mem_ctx,
			        const struct ldb_val *in, struct ldb_val *out)
{
	struct GUID guid;
	NTSTATUS status;

	status = GUID_from_string((const char *)in->data, &guid);
	if (!NT_STATUS_IS_OK(status)) {
		return -1;
	}

	status = ndr_push_struct_blob(out, mem_ctx, &guid,
				      (ndr_push_flags_fn_t)ndr_push_GUID);
	if (!NT_STATUS_IS_OK(status)) {
		return -1;
	}
	return 0;
}

/*
  convert a NDR formatted blob to a ldif formatted objectGUID
*/
static int ldif_write_objectGUID(struct ldb_context *ldb, void *mem_ctx,
				 const struct ldb_val *in, struct ldb_val *out)
{
	struct GUID guid;
	NTSTATUS status;
	status = ndr_pull_struct_blob(in, mem_ctx, &guid,
				      (ndr_pull_flags_fn_t)ndr_pull_GUID);
	if (!NT_STATUS_IS_OK(status)) {
		return -1;
	}
	out->data = (uint8_t *)GUID_string(mem_ctx, &guid);
	if (out->data == NULL) {
		return -1;
	}
	out->length = strlen((const char *)out->data);
	return 0;
}

static bool ldb_comparision_objectGUID_isString(const struct ldb_val *v)
{
	struct GUID guid;
	NTSTATUS status;

	if (v->length < 33) return false;

	/* see if the input if null-terninated (safety check for the below) */
	if (v->data[v->length] != '\0') return false;

	status = GUID_from_string((const char *)v->data, &guid);
	if (!NT_STATUS_IS_OK(status)) {
		return false;
	}

	return true;
}

/*
  compare two objectGUIDs
*/
static int ldb_comparison_objectGUID(struct ldb_context *ldb, void *mem_ctx,
				     const struct ldb_val *v1, const struct ldb_val *v2)
{
	if (ldb_comparision_objectGUID_isString(v1) && ldb_comparision_objectGUID_isString(v2)) {
		return strcmp((const char *)v1->data, (const char *)v2->data);
	} else if (ldb_comparision_objectGUID_isString(v1)
		   && !ldb_comparision_objectGUID_isString(v2)) {
		struct ldb_val v;
		int ret;
		if (ldif_read_objectGUID(ldb, mem_ctx, v1, &v) != 0) {
			return -1;
		}
		ret = ldb_comparison_binary(ldb, mem_ctx, &v, v2);
		talloc_free(v.data);
		return ret;
	} else if (!ldb_comparision_objectGUID_isString(v1)
		   && ldb_comparision_objectGUID_isString(v2)) {
		struct ldb_val v;
		int ret;
		if (ldif_read_objectGUID(ldb, mem_ctx, v2, &v) != 0) {
			return -1;
		}
		ret = ldb_comparison_binary(ldb, mem_ctx, v1, &v);
		talloc_free(v.data);
		return ret;
	}
	return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
}

/*
  canonicalise a objectGUID
*/
static int ldb_canonicalise_objectGUID(struct ldb_context *ldb, void *mem_ctx,
				       const struct ldb_val *in, struct ldb_val *out)
{
	if (ldb_comparision_objectGUID_isString(in)) {
		return ldif_read_objectGUID(ldb, mem_ctx, in, out);
	}
	return ldb_handler_copy(ldb, mem_ctx, in, out);
}


/*
  convert a ldif (SDDL) formatted ntSecurityDescriptor to a NDR formatted blob
*/
static int ldif_read_ntSecurityDescriptor(struct ldb_context *ldb, void *mem_ctx,
					  const struct ldb_val *in, struct ldb_val *out)
{
	struct security_descriptor *sd;
	NTSTATUS status;

	sd = sddl_decode(mem_ctx, (const char *)in->data, NULL);
	if (sd == NULL) {
		return -1;
	}
	status = ndr_push_struct_blob(out, mem_ctx, sd, 
				      (ndr_push_flags_fn_t)ndr_push_security_descriptor);
	talloc_free(sd);
	if (!NT_STATUS_IS_OK(status)) {
		return -1;
	}
	return 0;
}

/*
  convert a NDR formatted blob to a ldif formatted ntSecurityDescriptor (SDDL format)
*/
static int ldif_write_ntSecurityDescriptor(struct ldb_context *ldb, void *mem_ctx,
					   const struct ldb_val *in, struct ldb_val *out)
{
	struct security_descriptor *sd;
	NTSTATUS status;

	sd = talloc(mem_ctx, struct security_descriptor);
	if (sd == NULL) {
		return -1;
	}
	status = ndr_pull_struct_blob(in, sd, sd, 
				      (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(sd);
		return -1;
	}
	out->data = (uint8_t *)sddl_encode(mem_ctx, sd, NULL);
	talloc_free(sd);
	if (out->data == NULL) {
		return -1;
	}
	out->length = strlen((const char *)out->data);
	return 0;
}

/* 
   canonicolise an objectCategory.  We use the short form as the cannoical form:
   cn=Person,cn=Schema,cn=Configuration,<basedn> becomes 'person'
*/

static int ldif_canonicalise_objectCategory(struct ldb_context *ldb, void *mem_ctx,
					    const struct ldb_val *in, struct ldb_val *out)
{
	struct ldb_dn *dn1 = NULL;
	const struct dsdb_schema *schema = dsdb_get_schema(ldb);
	const struct dsdb_class *class;
	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
	if (!tmp_ctx) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if (!schema) {
		*out = data_blob_talloc(mem_ctx, in->data, in->length);
		if (in->data && !out->data) {
			return LDB_ERR_OPERATIONS_ERROR;
		}
		return LDB_SUCCESS;
	}
	dn1 = ldb_dn_new(tmp_ctx, ldb, (char *)in->data);
	if ( ! ldb_dn_validate(dn1)) {
		const char *lDAPDisplayName = talloc_strndup(tmp_ctx, (char *)in->data, in->length);
		class = dsdb_class_by_lDAPDisplayName(schema, lDAPDisplayName);
		if (class) {
			struct ldb_dn *dn = ldb_dn_new(mem_ctx, ldb,  
						       class->defaultObjectCategory);
			*out = data_blob_string_const(ldb_dn_alloc_casefold(mem_ctx, dn));
			talloc_free(tmp_ctx);

			if (!out->data) {
				return LDB_ERR_OPERATIONS_ERROR;
			}
			return LDB_SUCCESS;
		} else {
			*out = data_blob_talloc(mem_ctx, in->data, in->length);
			talloc_free(tmp_ctx);

			if (in->data && !out->data) {
				return LDB_ERR_OPERATIONS_ERROR;
			}
			return LDB_SUCCESS;
		}
	}
	*out = data_blob_string_const(ldb_dn_alloc_casefold(mem_ctx, dn1));
	talloc_free(tmp_ctx);

	if (!out->data) {
		return LDB_ERR_OPERATIONS_ERROR;
	}
	return LDB_SUCCESS;
}

static int ldif_comparison_objectCategory(struct ldb_context *ldb, void *mem_ctx,
					  const struct ldb_val *v1,
					  const struct ldb_val *v2)
{

	int ret, ret1, ret2;
	struct ldb_val v1_canon, v2_canon;
	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);

	/* I could try and bail if tmp_ctx was NULL, but what return
	 * value would I use?
	 *
	 * It seems easier to continue on the NULL context 
	 */
	ret1 = ldif_canonicalise_objectCategory(ldb, tmp_ctx, v1, &v1_canon);
	ret2 = ldif_canonicalise_objectCategory(ldb, tmp_ctx, v2, &v2_canon);

	if (ret1 == LDB_SUCCESS && ret2 == LDB_SUCCESS) {
		ret = data_blob_cmp(&v1_canon, &v2_canon);
	} else {
		ret = data_blob_cmp(v1, v2);
	}
	talloc_free(tmp_ctx);
	return ret;
}

#define LDB_SYNTAX_SAMBA_SID			"LDB_SYNTAX_SAMBA_SID"
#define LDB_SYNTAX_SAMBA_SECURITY_DESCRIPTOR	"LDB_SYNTAX_SAMBA_SECURITY_DESCRIPTOR"
#define LDB_SYNTAX_SAMBA_GUID			"LDB_SYNTAX_SAMBA_GUID"
#define LDB_SYNTAX_SAMBA_OBJECT_CATEGORY	"LDB_SYNTAX_SAMBA_OBJECT_CATEGORY"

static const struct ldb_schema_syntax samba_syntaxes[] = {
	{
		.name		= LDB_SYNTAX_SAMBA_SID,
		.ldif_read_fn	= ldif_read_objectSid,
		.ldif_write_fn	= ldif_write_objectSid,
		.canonicalise_fn= ldb_canonicalise_objectSid,
		.comparison_fn	= ldb_comparison_objectSid
	},{
		.name		= LDB_SYNTAX_SAMBA_SECURITY_DESCRIPTOR,
		.ldif_read_fn	= ldif_read_ntSecurityDescriptor,
		.ldif_write_fn	= ldif_write_ntSecurityDescriptor,
		.canonicalise_fn= ldb_handler_copy,
		.comparison_fn	= ldb_comparison_binary
	},{
		.name		= LDB_SYNTAX_SAMBA_GUID,
		.ldif_read_fn	= ldif_read_objectGUID,
		.ldif_write_fn	= ldif_write_objectGUID,
		.canonicalise_fn= ldb_canonicalise_objectGUID,
		.comparison_fn	= ldb_comparison_objectGUID
	},{
		.name		= LDB_SYNTAX_SAMBA_OBJECT_CATEGORY,
		.ldif_read_fn	= ldb_handler_copy,
		.ldif_write_fn	= ldb_handler_copy,
		.canonicalise_fn= ldif_canonicalise_objectCategory,
		.comparison_fn	= ldif_comparison_objectCategory
	}
};

static const struct {
	const char *name;
	const char *syntax;
} samba_attributes[] = {
	{ "objectSid",			LDB_SYNTAX_SAMBA_SID },
	{ "securityIdentifier", 	LDB_SYNTAX_SAMBA_SID },
	{ "ntSecurityDescriptor",	LDB_SYNTAX_SAMBA_SECURITY_DESCRIPTOR },
	{ "objectGUID",			LDB_SYNTAX_SAMBA_GUID },
	{ "invocationId",		LDB_SYNTAX_SAMBA_GUID },
	{ "schemaIDGUID",		LDB_SYNTAX_SAMBA_GUID },
	{ "attributeSecurityGUID",	LDB_SYNTAX_SAMBA_GUID },
	{ "parentGUID",			LDB_SYNTAX_SAMBA_GUID },
	{ "siteGUID",			LDB_SYNTAX_SAMBA_GUID },
	{ "pKTGUID",			LDB_SYNTAX_SAMBA_GUID },
	{ "fRSVersionGUID",		LDB_SYNTAX_SAMBA_GUID },
	{ "fRSReplicaSetGUID",		LDB_SYNTAX_SAMBA_GUID },
	{ "netbootGUID",		LDB_SYNTAX_SAMBA_GUID },
	{ "objectCategory",		LDB_SYNTAX_SAMBA_OBJECT_CATEGORY },
	{ "member",			LDB_SYNTAX_DN },
	{ "memberOf",			LDB_SYNTAX_DN },
	{ "nCName",			LDB_SYNTAX_DN },
	{ "schemaNamingContext",	LDB_SYNTAX_DN },
	{ "configurationNamingContext",	LDB_SYNTAX_DN },
	{ "rootDomainNamingContext",	LDB_SYNTAX_DN },
	{ "defaultNamingContext",	LDB_SYNTAX_DN },
	{ "subRefs",			LDB_SYNTAX_DN },
	{ "dMDLocation",		LDB_SYNTAX_DN },
	{ "serverReference",		LDB_SYNTAX_DN },
	{ "masteredBy",			LDB_SYNTAX_DN },
	{ "msDs-masteredBy",		LDB_SYNTAX_DN },
	{ "fSMORoleOwner",		LDB_SYNTAX_DN },
};

/*
  register the samba ldif handlers
*/
int ldb_register_samba_handlers(struct ldb_context *ldb)
{
	uint32_t i;

	for (i=0; i < ARRAY_SIZE(samba_attributes); i++) {
		int ret;
		uint32_t j;
		const struct ldb_schema_syntax *s = NULL;

		for (j=0; j < ARRAY_SIZE(samba_syntaxes); j++) {
			if (strcmp(samba_attributes[i].syntax, samba_syntaxes[j].name) == 0) {
				s = &samba_syntaxes[j];
				break;
			}
		}

		if (!s) {
			s = ldb_standard_syntax_by_name(ldb, samba_attributes[i].syntax);
		}

		if (!s) {
			return -1;
		}

		ret = ldb_schema_attribute_add_with_syntax(ldb, samba_attributes[i].name, 0, s);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}

	return LDB_SUCCESS;
}