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Fixed incorrect checking of PRINCIPAL_SELF permissions.
[Samba/gebeck_regimport.git] / source4 / dsdb / samdb / ldb_modules / acl.c
blob6cb50b2098400321bacc5f825f7840c15e17be2d
1 /*
2 ldb database library
3
4 Copyright (C) Simo Sorce 2006-2008
5 Copyright (C) Nadezhda Ivanova 2009
6 Copyright (C) Anatoliy Atanasov 2009
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 /*
23 * Name: ldb
24 *
25 * Component: ldb ACL module
26 *
27 * Description: Module that performs authorisation access checks based on the
28 * account's security context and the DACL of the object being polled.
29 * Only DACL checks implemented at this point
30 *
31 * Authors: Nadezhda Ivanova, Anatoliy Atanasov
32 */
33
34 #include "includes.h"
35 #include "ldb_module.h"
36 #include "auth/auth.h"
37 #include "libcli/security/security.h"
38 #include "librpc/gen_ndr/ndr_security.h"
39 #include "dsdb/samdb/samdb.h"
40 #include "librpc/gen_ndr/ndr_security.h"
41 #include "param/param.h"
42
43 struct extended_access_check_attribute {
44 const char *oa_name;
45 const uint32_t requires_rights;
46 };
47
48 struct acl_private {
49 bool acl_perform;
50 const char **password_attrs;
51 };
52
53 struct acl_context {
54 struct ldb_module *module;
55 struct ldb_request *req;
56 enum security_user_level user_type;
57 bool allowedAttributes;
58 bool allowedAttributesEffective;
59 bool allowedChildClasses;
60 bool allowedChildClassesEffective;
61 bool sDRightsEffective;
62 const char * const *attrs;
63 };
64
65 bool is_root_base_dn(struct ldb_context *ldb, struct ldb_dn *dn_to_check)
66 {
67 int result;
68 struct ldb_dn *root_base_dn = ldb_get_root_basedn(ldb);
69 result = ldb_dn_compare(root_base_dn,dn_to_check);
70 return (result==0);
71 }
72
73 static enum security_user_level what_is_user(struct ldb_module *module)
74 {
75 struct ldb_context *ldb = ldb_module_get_ctx(module);
76 struct auth_session_info *session_info
77 = (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
78 return security_session_user_level(session_info);
79 }
80
81 static struct security_token *acl_user_token(struct ldb_module *module)
82 {
83 struct ldb_context *ldb = ldb_module_get_ctx(module);
84 struct auth_session_info *session_info
85 = (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
86 if(!session_info) {
87 return NULL;
88 }
89 return session_info->security_token;
90 }
91
92 static int acl_module_init(struct ldb_module *module)
93 {
94 struct ldb_context *ldb;
95 struct acl_private *data;
96 int ret, i;
97 TALLOC_CTX *mem_ctx = talloc_new(module);
98 static const char *attrs[] = { "passwordAttribute", NULL };
99 struct ldb_result *res;
100 struct ldb_message *msg;
101 struct ldb_message_element *password_attributes;
102
103 ldb = ldb_module_get_ctx(module);
104
105 ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
106 if (ret != LDB_SUCCESS) {
107 ldb_debug(ldb, LDB_DEBUG_ERROR,
108 "acl_module_init: Unable to register control with rootdse!\n");
109 return LDB_ERR_OPERATIONS_ERROR;
110 }
111
112 data = talloc(module, struct acl_private);
113 if (data == NULL) {
114 ldb_oom(ldb);
115 return LDB_ERR_OPERATIONS_ERROR;
116 }
117
118 data->password_attrs = NULL;
119 data->acl_perform = lp_parm_bool(ldb_get_opaque(ldb, "loadparm"),
120 NULL, "acl", "perform", false);
121 ldb_module_set_private(module, data);
122
123 if (!mem_ctx) {
124 ldb_oom(ldb);
125 return LDB_ERR_OPERATIONS_ERROR;
126 }
127
128 ret = ldb_search(ldb, mem_ctx, &res,
129 ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
130 LDB_SCOPE_BASE, attrs, NULL);
131 if (ret != LDB_SUCCESS) {
132 goto done;
133 }
134 if (res->count == 0) {
135 goto done;
136 }
137
138 if (res->count > 1) {
139 talloc_free(mem_ctx);
140 return LDB_ERR_CONSTRAINT_VIOLATION;
141 }
142
143 msg = res->msgs[0];
144
145 password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
146 if (!password_attributes) {
147 goto done;
148 }
149 data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
150 if (!data->password_attrs) {
151 talloc_free(mem_ctx);
152 ldb_oom(ldb);
153 return LDB_ERR_OPERATIONS_ERROR;
154 }
155 for (i=0; i < password_attributes->num_values; i++) {
156 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
157 talloc_steal(data->password_attrs, password_attributes->values[i].data);
158 }
159 data->password_attrs[i] = NULL;
160
161 done:
162 talloc_free(mem_ctx);
163 return ldb_next_init(module);
164 }
165
166 static int get_sd_from_ldb_message(TALLOC_CTX *mem_ctx,
167 struct ldb_message *acl_res,
168 struct security_descriptor **sd)
169 {
170 struct ldb_message_element *sd_element;
171 enum ndr_err_code ndr_err;
172
173 sd_element = ldb_msg_find_element(acl_res, "nTSecurityDescriptor");
174 if (!sd_element) {
175 *sd = NULL;
176 return LDB_SUCCESS;
177 }
178 *sd = talloc(mem_ctx, struct security_descriptor);
179 if(!*sd) {
180 return LDB_ERR_OPERATIONS_ERROR;
181 }
182 ndr_err = ndr_pull_struct_blob(&sd_element->values[0], *sd, NULL, *sd,
183 (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
184
185 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
186 return LDB_ERR_OPERATIONS_ERROR;
187 }
188
189 return LDB_SUCCESS;
190 }
191
192 static const struct GUID *get_oc_guid_from_message(struct ldb_module *module,
193 struct ldb_message *msg)
194 {
195 struct ldb_message_element *oc_el;
196 struct ldb_context *ldb = ldb_module_get_ctx(module);
197
198 oc_el = ldb_msg_find_element(msg, "objectClass");
199 if (!oc_el) {
200 return NULL;
201 }
202
203 return class_schemaid_guid_by_lDAPDisplayName(dsdb_get_schema(ldb),
204 (char *)oc_el->values[oc_el->num_values-1].data);
205 }
206
207 static int get_dom_sid_from_ldb_message(TALLOC_CTX *mem_ctx,
208 struct ldb_message *acl_res,
209 struct dom_sid **sid)
210 {
211 struct ldb_message_element *sid_element;
212 enum ndr_err_code ndr_err;
213
214 sid_element = ldb_msg_find_element(acl_res, "objectSid");
215 if (!sid_element) {
216 *sid = NULL;
217 return LDB_SUCCESS;
218 }
219 *sid = talloc(mem_ctx, struct dom_sid);
220 if(!*sid) {
221 return LDB_ERR_OPERATIONS_ERROR;
222 }
223 ndr_err = ndr_pull_struct_blob(&sid_element->values[0], *sid, NULL, *sid,
224 (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
225
226 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
227 return LDB_ERR_OPERATIONS_ERROR;
228 }
229
230 return LDB_SUCCESS;
231 }
232
233
234 static void acl_debug(struct security_descriptor *sd,
235 struct security_token *token,
236 struct ldb_dn *dn,
237 bool denied,
238 int level)
239 {
240 if (denied) {
241 DEBUG(level, ("Access on %s denied", ldb_dn_get_linearized(dn)));
242 } else {
243 DEBUG(level, ("Access on %s granted", ldb_dn_get_linearized(dn)));
244 }
245
246 DEBUG(level,("Security context: %s\n",
247 ndr_print_struct_string(0,(ndr_print_fn_t)ndr_print_security_token,"", token)));
248 DEBUG(level,("Security descriptor: %s\n",
249 ndr_print_struct_string(0,(ndr_print_fn_t)ndr_print_security_descriptor,"", sd)));
250 }
251
252 static int check_access_on_dn(struct ldb_module *module,
253 TALLOC_CTX *mem_ctx,
254 struct ldb_dn *dn,
255 uint32_t access,
256 struct object_tree *tree)
257 {
258 int ret;
259 struct ldb_context *ldb = ldb_module_get_ctx(module);
260 struct ldb_result *acl_res;
261 struct security_descriptor *sd = NULL;
262 struct dom_sid *sid = NULL;
263 NTSTATUS status;
264 uint32_t access_granted;
265 static const char *acl_attrs[] = {
266 "nTSecurityDescriptor",
267 "objectSid",
268 NULL
269 };
270
271 ret = ldb_search(ldb, mem_ctx, &acl_res, dn, LDB_SCOPE_BASE, acl_attrs, NULL);
272 /* we sould be able to find the parent */
273 if (ret != LDB_SUCCESS) {
274 DEBUG(10,("acl: failed to find object %s\n", ldb_dn_get_linearized(dn)));
275 return ret;
276 }
277
278 ret = get_sd_from_ldb_message(mem_ctx, acl_res->msgs[0], &sd);
279 if (ret != LDB_SUCCESS) {
280 return LDB_ERR_OPERATIONS_ERROR;
281 }
282 /* Theoretically we pass the check if the object has no sd */
283 if (!sd) {
284 return LDB_SUCCESS;
285 }
286 ret = get_dom_sid_from_ldb_message(mem_ctx, acl_res->msgs[0], &sid);
287 if (ret != LDB_SUCCESS) {
288 return LDB_ERR_OPERATIONS_ERROR;
289 }
290
291 status = sec_access_check_ds(sd, acl_user_token(module),
292 access,
293 &access_granted,
294 tree,
295 sid);
296 if (!NT_STATUS_IS_OK(status)) {
297 acl_debug(sd,
298 acl_user_token(module),
299 dn,
300 true,
301 10);
302 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
303 }
304 return LDB_SUCCESS;
305 }
306
307 static int acl_check_access_on_attribute(struct ldb_module *module,
308 TALLOC_CTX *mem_ctx,
309 struct security_descriptor *sd,
310 struct dom_sid *rp_sid,
311 uint32_t access,
312 struct dsdb_attribute *attr)
313 {
314 int ret;
315 NTSTATUS status;
316 uint32_t access_granted;
317 struct object_tree *root = NULL;
318 struct object_tree *new_node = NULL;
319 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
320 struct security_token *token = acl_user_token(module);
321 if (attr) {
322 if (!GUID_all_zero(&attr->attributeSecurityGUID)) {
323 if (!insert_in_object_tree(tmp_ctx,
324 &attr->attributeSecurityGUID, access,
325 &root, &new_node)) {
326 DEBUG(10, ("acl_search: cannot add to object tree securityGUID\n"));
327 goto fail;
328 }
329
330 if (!insert_in_object_tree(tmp_ctx,
331 &attr->schemaIDGUID, access, &new_node, &new_node)) {
332 DEBUG(10, ("acl_search: cannot add to object tree attributeGUID\n"));
333 goto fail;
334 }
335 }
336 else {
337 if (!insert_in_object_tree(tmp_ctx,
338 &attr->schemaIDGUID, access, &root, &new_node)) {
339 DEBUG(10, ("acl_search: cannot add to object tree attributeGUID\n"));
340 goto fail;
341 }
342 }
343 }
344 status = sec_access_check_ds(sd, token,
345 access,
346 &access_granted,
347 root,
348 rp_sid);
349 if (!NT_STATUS_IS_OK(status)) {
350 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
351 }
352 else {
353 ret = LDB_SUCCESS;
354 }
355 return ret;
356 fail:
357 return LDB_ERR_OPERATIONS_ERROR;
358 }
359
360 static int acl_check_access_on_class(struct ldb_module *module,
361 TALLOC_CTX *mem_ctx,
362 struct security_descriptor *sd,
363 struct dom_sid *rp_sid,
364 uint32_t access,
365 const char *class_name)
366 {
367 int ret;
368 struct ldb_context *ldb = ldb_module_get_ctx(module);
369 NTSTATUS status;
370 uint32_t access_granted;
371 struct object_tree *root = NULL;
372 struct object_tree *new_node = NULL;
373 struct GUID *guid;
374 const struct dsdb_schema *schema = dsdb_get_schema(ldb);
375 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
376 struct security_token *token = acl_user_token(module);
377 if (class_name) {
378 guid = class_schemaid_guid_by_lDAPDisplayName(schema, class_name);
379 if (!guid) {
380 DEBUG(10, ("acl_search: cannot find class %s\n",
381 class_name));
382 goto fail;
383 }
384 if (!insert_in_object_tree(tmp_ctx,
385 guid, access,
386 &root, &new_node)) {
387 DEBUG(10, ("acl_search: cannot add to object tree guid\n"));
388 goto fail;
389 }
390 }
391 status = sec_access_check_ds(sd, token,
392 access,
393 &access_granted,
394 root,
395 rp_sid);
396 if (!NT_STATUS_IS_OK(status)) {
397 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
398 }
399 else {
400 ret = LDB_SUCCESS;
401 }
402 return ret;
403 fail:
404 return LDB_ERR_OPERATIONS_ERROR;
405 }
406
407 static int acl_allowedAttributes(struct ldb_module *module,
408 struct ldb_message *sd_msg,
409 struct ldb_message *msg,
410 struct acl_context *ac)
411 {
412 struct ldb_message_element *oc_el;
413 struct ldb_context *ldb = ldb_module_get_ctx(module);
414 const struct dsdb_schema *schema = dsdb_get_schema(ldb);
415 TALLOC_CTX *mem_ctx;
416 const char **attr_list;
417 int i, ret;
418
419 /* If we don't have a schema yet, we can't do anything... */
420 if (schema == NULL) {
421 return LDB_SUCCESS;
422 }
423
424 /* Must remove any existing attribute */
425 if (ac->allowedAttributes) {
426 ldb_msg_remove_attr(msg, "allowedAttributes");
427 }
428
429 mem_ctx = talloc_new(msg);
430 if (!mem_ctx) {
431 ldb_oom(ldb);
432 return LDB_ERR_OPERATIONS_ERROR;
433 }
434
435 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
436 attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
437 if (!attr_list) {
438 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
439 talloc_free(mem_ctx);
440 return LDB_ERR_OPERATIONS_ERROR;
441 }
442 if (ac->allowedAttributes) {
443 for (i=0; attr_list && attr_list[i]; i++) {
444 ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
445 }
446 }
447 if (ac->allowedAttributesEffective) {
448 struct security_descriptor *sd;
449 struct dom_sid *sid = NULL;
450 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
451 if (ac->user_type == SECURITY_SYSTEM) {
452 for (i=0; attr_list && attr_list[i]; i++) {
453 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
454 }
455 return LDB_SUCCESS;
456 }
457
458 ret = get_sd_from_ldb_message(mem_ctx, sd_msg, &sd);
459
460 if (ret != LDB_SUCCESS) {
461 return ret;
462 }
463 ret = get_dom_sid_from_ldb_message(mem_ctx, sd_msg, &sid);
464
465 if (ret != LDB_SUCCESS) {
466 return ret;
467 }
468 for (i=0; attr_list && attr_list[i]; i++) {
469 struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
470 attr_list[i]);
471 if (!attr) {
472 return LDB_ERR_OPERATIONS_ERROR;
473 }
474 /* remove constructed attributes */
475 if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
476 || attr->systemOnly
477 || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
478 continue;
479 }
480 ret = acl_check_access_on_attribute(module,
481 msg,
482 sd,
483 sid,
484 SEC_ADS_WRITE_PROP,
485 attr);
486 if (ret == LDB_SUCCESS) {
487 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
488 }
489 }
490 }
491 return LDB_SUCCESS;
492 }
493
494 static int acl_childClasses(struct ldb_module *module,
495 struct ldb_message *sd_msg,
496 struct ldb_message *msg,
497 const char *attrName)
498 {
499 struct ldb_message_element *oc_el;
500 struct ldb_message_element *allowedClasses;
501 struct ldb_context *ldb = ldb_module_get_ctx(module);
502 const struct dsdb_schema *schema = dsdb_get_schema(ldb);
503 const struct dsdb_class *sclass;
504 int i, j, ret;
505
506 /* If we don't have a schema yet, we can't do anything... */
507 if (schema == NULL) {
508 return LDB_SUCCESS;
509 }
510
511 /* Must remove any existing attribute, or else confusion reins */
512 ldb_msg_remove_attr(msg, attrName);
513 ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
514 if (ret != LDB_SUCCESS) {
515 return ret;
516 }
517
518 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
519
520 for (i=0; oc_el && i < oc_el->num_values; i++) {
521 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
522 if (!sclass) {
523 /* We don't know this class? what is going on? */
524 continue;
525 }
526
527 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
528 ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
529 }
530 }
531 if (allowedClasses->num_values > 1) {
532 qsort(allowedClasses->values,
533 allowedClasses->num_values,
534 sizeof(*allowedClasses->values),
535 (comparison_fn_t)data_blob_cmp);
536
537 for (i=1 ; i < allowedClasses->num_values; i++) {
538 struct ldb_val *val1 = &allowedClasses->values[i-1];
539 struct ldb_val *val2 = &allowedClasses->values[i];
540 if (data_blob_cmp(val1, val2) == 0) {
541 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
542 allowedClasses->num_values--;
543 i--;
544 }
545 }
546 }
547
548 return LDB_SUCCESS;
549 }
550
551 static int acl_childClassesEffective(struct ldb_module *module,
552 struct ldb_message *sd_msg,
553 struct ldb_message *msg,
554 struct acl_context *ac)
555 {
556 struct ldb_message_element *oc_el;
557 struct ldb_message_element *allowedClasses = NULL;
558 struct ldb_context *ldb = ldb_module_get_ctx(module);
559 const struct dsdb_schema *schema = dsdb_get_schema(ldb);
560 const struct dsdb_class *sclass;
561 struct security_descriptor *sd;
562 struct dom_sid *sid = NULL;
563 int i, j, ret;
564
565 if (ac->user_type == SECURITY_SYSTEM) {
566 return acl_childClasses(module, sd_msg, msg, "allowedChildClassesEffective");
567 }
568
569 /* If we don't have a schema yet, we can't do anything... */
570 if (schema == NULL) {
571 return LDB_SUCCESS;
572 }
573
574 /* Must remove any existing attribute, or else confusion reins */
575 ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
576
577 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
578 ret = get_sd_from_ldb_message(msg, sd_msg, &sd);
579 if (ret != LDB_SUCCESS) {
580 return ret;
581 }
582 ret = get_dom_sid_from_ldb_message(msg, sd_msg, &sid);
583
584 if (ret != LDB_SUCCESS) {
585 return ret;
586 }
587 for (i=0; oc_el && i < oc_el->num_values; i++) {
588 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
589 if (!sclass) {
590 /* We don't know this class? what is going on? */
591 continue;
592 }
593
594 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
595 ret = acl_check_access_on_class(module,
596 msg,
597 sd,
598 sid,
599 SEC_ADS_CREATE_CHILD,
600 sclass->possibleInferiors[j]);
601 if (ret == LDB_SUCCESS) {
602 ldb_msg_add_string(msg, "allowedChildClassesEffective",
603 sclass->possibleInferiors[j]);
604 }
605 }
606 }
607 allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
608 if (!allowedClasses) {
609 return LDB_SUCCESS;
610 }
611
612 if (allowedClasses->num_values > 1) {
613 qsort(allowedClasses->values,
614 allowedClasses->num_values,
615 sizeof(*allowedClasses->values),
616 (comparison_fn_t)data_blob_cmp);
617 for (i=1 ; i < allowedClasses->num_values; i++) {
618 struct ldb_val *val1 = &allowedClasses->values[i-1];
619 struct ldb_val *val2 = &allowedClasses->values[i];
620 if (data_blob_cmp(val1, val2) == 0) {
621 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
622 allowedClasses->num_values--;
623 i--;
624 }
625 }
626 }
627 return LDB_SUCCESS;
628 }
629
630 static int acl_sDRightsEffective(struct ldb_module *module,
631 struct ldb_message *sd_msg,
632 struct ldb_message *msg,
633 struct acl_context *ac)
634 {
635 struct ldb_message_element *rightsEffective;
636 int ret;
637 struct security_descriptor *sd;
638 struct dom_sid *sid = NULL;
639 uint32_t flags = 0;
640
641 /* Must remove any existing attribute, or else confusion reins */
642 ldb_msg_remove_attr(msg, "sDRightsEffective");
643 ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
644 if (ret != LDB_SUCCESS) {
645 return ret;
646 }
647 if (ac->user_type == SECURITY_SYSTEM) {
648 flags = SECINFO_OWNER | SECINFO_GROUP | SECINFO_SACL | SECINFO_DACL;
649 }
650 else {
651 /* Get the security descriptor from the message */
652 ret = get_sd_from_ldb_message(msg, sd_msg, &sd);
653 if (ret != LDB_SUCCESS) {
654 return ret;
655 }
656 ret = get_dom_sid_from_ldb_message(msg, sd_msg, &sid);
657
658 if (ret != LDB_SUCCESS) {
659 return ret;
660 }
661 ret = acl_check_access_on_attribute(module,
662 msg,
663 sd,
664 sid,
665 SEC_STD_WRITE_OWNER,
666 NULL);
667 if (ret == LDB_SUCCESS) {
668 flags |= SECINFO_OWNER | SECINFO_GROUP;
669 }
670 ret = acl_check_access_on_attribute(module,
671 msg,
672 sd,
673 sid,
674 SEC_STD_WRITE_DAC,
675 NULL);
676 if (ret == LDB_SUCCESS) {
677 flags |= SECINFO_DACL;
678 }
679 ret = acl_check_access_on_attribute(module,
680 msg,
681 sd,
682 sid,
683 SEC_FLAG_SYSTEM_SECURITY,
684 NULL);
685 if (ret == LDB_SUCCESS) {
686 flags |= SECINFO_SACL;
687 }
688 }
689 ldb_msg_add_fmt(msg, "sDRightsEffective", "%u", flags);
690 return LDB_SUCCESS;
691 }
692
693 static int acl_add(struct ldb_module *module, struct ldb_request *req)
694 {
695 int ret;
696 struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
697 struct ldb_context *ldb;
698 struct ldb_message_element *oc_el;
699 const struct GUID *guid;
700 struct object_tree *root = NULL;
701 struct object_tree *new_node = NULL;
702
703 if (what_is_user(module) == SECURITY_SYSTEM) {
704 return ldb_next_request(module, req);
705 }
706
707 if (ldb_dn_is_special(req->op.add.message->dn)) {
708 return ldb_next_request(module, req);
709 }
710 ldb = ldb_module_get_ctx(module);
711 /* Creating an NC. There is probably something we should do here,
712 * but we will establish that later */
713 if ((ldb_dn_compare(req->op.add.message->dn, (ldb_get_schema_basedn(ldb))) == 0) ||
714 (ldb_dn_compare(req->op.add.message->dn, (ldb_get_config_basedn(ldb))) == 0) ||
715 (ldb_dn_compare(req->op.add.message->dn, (ldb_get_root_basedn(ldb))) == 0)) {
716 return ldb_next_request(module, req);
717 }
718
719 oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
720 if (!oc_el || oc_el->num_values == 0) {
721 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
722 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
723 }
724
725 guid = class_schemaid_guid_by_lDAPDisplayName(dsdb_get_schema(ldb),
726 (char *)oc_el->values[oc_el->num_values-1].data);
727
728 if (!insert_in_object_tree(req, guid, SEC_ADS_CREATE_CHILD, &root, &new_node)) {
729 return LDB_ERR_OPERATIONS_ERROR;
730 }
731
732 ret = check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, root);
733 if (ret != LDB_SUCCESS) {
734 return ret;
735 }
736
737 return ldb_next_request(module, req);
738 }
739
740 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
741 {
742 int ret;
743 struct ldb_context *ldb = ldb_module_get_ctx(module);
744 const struct dsdb_schema *schema = dsdb_get_schema(ldb);
745 int i;
746 bool modify_sd = false;
747 const struct GUID *guid;
748 uint32_t access_granted;
749 struct object_tree *root = NULL;
750 struct object_tree *new_node = NULL;
751 NTSTATUS status;
752 struct ldb_result *acl_res;
753 struct security_descriptor *sd;
754 struct dom_sid *sid = NULL;
755 TALLOC_CTX *tmp_ctx = talloc_new(req);
756 static const char *acl_attrs[] = {
757 "nTSecurityDescriptor",
758 "objectClass",
759 "objectSid",
760 NULL
761 };
762
763 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
764 if (what_is_user(module) == SECURITY_SYSTEM) {
765 return ldb_next_request(module, req);
766 }
767 if (ldb_dn_is_special(req->op.mod.message->dn)) {
768 return ldb_next_request(module, req);
769 }
770 ret = ldb_search(ldb, req, &acl_res, req->op.mod.message->dn,
771 LDB_SCOPE_BASE, acl_attrs, NULL);
772
773 if (ret != LDB_SUCCESS) {
774 return ret;
775 }
776
777 ret = get_sd_from_ldb_message(req, acl_res->msgs[0], &sd);
778 if (ret != LDB_SUCCESS) {
779 DEBUG(10, ("acl_modify: cannot get descriptor\n"));
780 return ret;
781 }
782 /* Theoretically we pass the check if the object has no sd */
783 if (!sd) {
784 return LDB_SUCCESS;
785 }
786
787 guid = get_oc_guid_from_message(module,acl_res->msgs[0]);
788 if (!guid) {
789 DEBUG(10, ("acl_modify: cannot get guid\n"));
790 goto fail;
791 }
792
793 ret = get_dom_sid_from_ldb_message(req, acl_res->msgs[0], &sid);
794 if (ret != LDB_SUCCESS) {
795 return LDB_ERR_OPERATIONS_ERROR;
796 }
797
798 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
799 &root, &new_node)) {
800 DEBUG(10, ("acl_modify: cannot add to object tree\n"));
801 goto fail;
802 }
803 for (i=0; i < req->op.mod.message->num_elements; i++){
804 const struct dsdb_attribute *attr;
805 /* clearTextPassword is not in schema */
806 if (strcmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
807 attr = dsdb_attribute_by_lDAPDisplayName(schema, "unicodePwd");
808 } else {
809 attr = dsdb_attribute_by_lDAPDisplayName(schema,
810 req->op.mod.message->elements[i].name);
811 }
812 if (strcmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
813 modify_sd = true;
814 } else {
815
816 if (!attr) {
817 DEBUG(10, ("acl_modify: cannot find attribute %s\n",
818 req->op.mod.message->elements[i].name));
819 goto fail;
820 }
821 if (!insert_in_object_tree(tmp_ctx,
822 &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
823 &new_node, &new_node)) {
824 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
825 goto fail;
826 }
827
828 if (!insert_in_object_tree(tmp_ctx,
829 &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
830 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
831 goto fail;
832 }
833 }
834 }
835
836 if (root->num_of_children > 0) {
837 status = sec_access_check_ds(sd, acl_user_token(module),
838 SEC_ADS_WRITE_PROP,
839 &access_granted,
840 root,
841 sid);
842
843 if (!NT_STATUS_IS_OK(status)) {
844 DEBUG(10, ("Object %s nas no write property access\n",
845 ldb_dn_get_linearized(req->op.mod.message->dn)));
846 acl_debug(sd,
847 acl_user_token(module),
848 req->op.mod.message->dn,
849 true,
850 10);
851 talloc_free(tmp_ctx);
852 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
853 }
854 }
855 if (modify_sd) {
856 status = sec_access_check_ds(sd, acl_user_token(module),
857 SEC_STD_WRITE_DAC,
858 &access_granted,
859 NULL,
860 sid);
861
862 if (!NT_STATUS_IS_OK(status)) {
863 DEBUG(10, ("Object %s nas no write dacl access\n",
864 ldb_dn_get_linearized(req->op.mod.message->dn)));
865 acl_debug(sd,
866 acl_user_token(module),
867 req->op.mod.message->dn,
868 true,
869 10);
870 talloc_free(tmp_ctx);
871 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
872 }
873 }
874
875 talloc_free(tmp_ctx);
876 return ldb_next_request(module, req);
877 fail:
878 talloc_free(tmp_ctx);
879 return LDB_ERR_OPERATIONS_ERROR;
880 }
881
882 /* similar to the modify for the time being.
883 * We need to concider the special delete tree case, though - TODO */
884 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
885 {
886 int ret;
887 struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
888 struct ldb_context *ldb;
889
890 DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
891 if (what_is_user(module) == SECURITY_SYSTEM) {
892 return ldb_next_request(module, req);
893 }
894
895 if (ldb_dn_is_special(req->op.del.dn)) {
896 return ldb_next_request(module, req);
897 }
898 ldb = ldb_module_get_ctx(module);
899 /* first check if we have delete object right */
900 ret = check_access_on_dn(module, req, req->op.del.dn, SEC_STD_DELETE, NULL);
901 if (ret == LDB_SUCCESS) {
902 return ldb_next_request(module, req);
903 }
904
905 /* Nope, we don't have delete object. Lets check if we have delete child on the parent */
906 /* No parent, so check fails */
907 if ((ldb_dn_compare(req->op.del.dn, (ldb_get_schema_basedn(ldb))) == 0) ||
908 (ldb_dn_compare(req->op.del.dn, (ldb_get_config_basedn(ldb))) == 0) ||
909 (ldb_dn_compare(req->op.del.dn, (ldb_get_root_basedn(ldb))) == 0)) {
910 DEBUG(10,("acl:deleting an NC\n"));
911 return ldb_module_done(req, NULL, NULL, LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS);
912 }
913
914 ret = check_access_on_dn(module, req, parent, SEC_ADS_DELETE_CHILD, NULL);
915 if (ret != LDB_SUCCESS) {
916 return ret;
917 }
918 return ldb_next_request(module, req);
919 }
920
921 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
922 {
923 int ret;
924 struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
925 struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
926 struct ldb_context *ldb;
927 struct security_descriptor *sd = NULL;
928 struct dom_sid *sid = NULL;
929 struct ldb_result *acl_res;
930 const struct GUID *guid;
931 struct object_tree *root = NULL;
932 struct object_tree *new_node = NULL;
933 TALLOC_CTX *tmp_ctx = talloc_new(req);
934 NTSTATUS status;
935 uint32_t access_granted;
936 static const char *acl_attrs[] = {
937 "nTSecurityDescriptor",
938 "objectClass",
939 "objectSid",
940 NULL
941 };
942
943 DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
944 if (what_is_user(module) == SECURITY_SYSTEM) {
945 return ldb_next_request(module, req);
946 }
947 if (ldb_dn_is_special(req->op.rename.olddn)) {
948 return ldb_next_request(module, req);
949 }
950 ldb = ldb_module_get_ctx(module);
951
952 /* TODO search to include deleted objects */
953 ret = ldb_search(ldb, req, &acl_res, req->op.rename.olddn,
954 LDB_SCOPE_BASE, acl_attrs, NULL);
955 /* we sould be able to find the parent */
956 if (ret != LDB_SUCCESS) {
957 DEBUG(10,("acl: failed to find object %s\n",
958 ldb_dn_get_linearized(req->op.rename.olddn)));
959 return ret;
960 }
961
962 guid = get_oc_guid_from_message(module,acl_res->msgs[0]);
963 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
964 &root, &new_node)) {
965 return LDB_ERR_OPERATIONS_ERROR;
966 };
967
968 guid = attribute_schemaid_guid_by_lDAPDisplayName(dsdb_get_schema(ldb),
969 "name");
970 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
971 &new_node, &new_node)) {
972 return LDB_ERR_OPERATIONS_ERROR;
973 };
974
975 ret = get_sd_from_ldb_message(req, acl_res->msgs[0], &sd);
976
977 if (ret != LDB_SUCCESS) {
978 return LDB_ERR_OPERATIONS_ERROR;
979 }
980 /* Theoretically we pass the check if the object has no sd */
981 if (!sd) {
982 return LDB_SUCCESS;
983 }
984 ret = get_dom_sid_from_ldb_message(req, acl_res->msgs[0], &sid);
985 if (ret != LDB_SUCCESS) {
986 return LDB_ERR_OPERATIONS_ERROR;
987 }
988
989 status = sec_access_check_ds(sd, acl_user_token(module),
990 SEC_ADS_WRITE_PROP,
991 &access_granted,
992 root,
993 sid);
994
995 if (!NT_STATUS_IS_OK(status)) {
996 DEBUG(10, ("Object %s nas no wp on name\n",
997 ldb_dn_get_linearized(req->op.rename.olddn)));
998 acl_debug(sd,
999 acl_user_token(module),
1000 req->op.rename.olddn,
1001 true,
1002 10);
1003 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1004 }
1005
1006 if (ldb_dn_compare(oldparent, newparent) == 0) {
1007 /* regular rename, not move, nothing more to do */
1008 return ldb_next_request(module, req);
1009 }
1010
1011 /* What exactly to do in this case? It would fail anyway.. */
1012 if ((ldb_dn_compare(req->op.rename.newdn, (ldb_get_schema_basedn(ldb))) == 0) ||
1013 (ldb_dn_compare(req->op.rename.newdn, (ldb_get_config_basedn(ldb))) == 0) ||
1014 (ldb_dn_compare(req->op.rename.newdn, (ldb_get_root_basedn(ldb))) == 0)) {
1015 DEBUG(10,("acl:moving as an NC\n"));
1016 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1017 }
1018 /* new parent should have create child */
1019 talloc_free(tmp_ctx);
1020 tmp_ctx = talloc_new(req);
1021 root = NULL;
1022 new_node = NULL;
1023 guid = get_oc_guid_from_message(module,acl_res->msgs[0]);
1024 if (!guid) {
1025 DEBUG(10,("acl:renamed object has no object class\n"));
1026 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
1027 }
1028 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_CREATE_CHILD,
1029 &root, &new_node)) {
1030 return LDB_ERR_OPERATIONS_ERROR;
1031 }
1032 ret = check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, root);
1033 if (ret != LDB_SUCCESS) {
1034 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1035 return ret;
1036 }
1037 /* do we have delete object on the object? */
1038
1039 status = sec_access_check_ds(sd, acl_user_token(module),
1040 SEC_STD_DELETE,
1041 &access_granted,
1042 NULL,
1043 sid);
1044
1045 if (NT_STATUS_IS_OK(status)) {
1046 return ldb_next_request(module, req);
1047 }
1048 /* what about delete child on the current parent */
1049 ret = check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL);
1050 if (ret != LDB_SUCCESS) {
1051 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1052 return ldb_module_done(req, NULL, NULL, ret);
1053 }
1054 return ldb_next_request(module, req);
1055 }
1056
1057 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1058 {
1059 struct ldb_context *ldb;
1060 struct acl_context *ac;
1061 struct acl_private *data;
1062 struct ldb_result *acl_res;
1063 static const char *acl_attrs[] = {
1064 "objectClass",
1065 "nTSecurityDescriptor",
1066 "objectSid",
1067 NULL
1068 };
1069 int ret, i;
1070
1071 ac = talloc_get_type(req->context, struct acl_context);
1072 data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1073 ldb = ldb_module_get_ctx(ac->module);
1074
1075 if (!ares) {
1076 return ldb_module_done(ac->req, NULL, NULL,
1077 LDB_ERR_OPERATIONS_ERROR);
1078 }
1079 if (ares->error != LDB_SUCCESS) {
1080 return ldb_module_done(ac->req, ares->controls,
1081 ares->response, ares->error);
1082 }
1083
1084 switch (ares->type) {
1085 case LDB_REPLY_ENTRY:
1086 if (ac->allowedAttributes
1087 || ac->allowedChildClasses
1088 || ac->allowedChildClassesEffective
1089 || ac->allowedAttributesEffective
1090 || ac->sDRightsEffective) {
1091 ret = ldb_search(ldb, ac, &acl_res, ares->message->dn, LDB_SCOPE_BASE, acl_attrs, NULL);
1092 if (ret != LDB_SUCCESS) {
1093 return ldb_module_done(ac->req, NULL, NULL, ret);
1094 }
1095 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1096 ret = acl_allowedAttributes(ac->module, acl_res->msgs[0], ares->message, ac);
1097 if (ret != LDB_SUCCESS) {
1098 return ldb_module_done(ac->req, NULL, NULL, ret);
1099 }
1100 }
1101 if (ac->allowedChildClasses) {
1102 ret = acl_childClasses(ac->module, acl_res->msgs[0],
1103 ares->message, "allowedChildClasses");
1104 if (ret != LDB_SUCCESS) {
1105 return ldb_module_done(ac->req, NULL, NULL, ret);
1106 }
1107 }
1108 if (ac->allowedChildClassesEffective) {
1109 ret = acl_childClassesEffective(ac->module,
1110 acl_res->msgs[0], ares->message, ac);
1111 if (ret != LDB_SUCCESS) {
1112 return ldb_module_done(ac->req, NULL, NULL, ret);
1113 }
1114 }
1115 if (ac->sDRightsEffective) {
1116 ret = acl_sDRightsEffective(ac->module,
1117 acl_res->msgs[0], ares->message, ac);
1118 if (ret != LDB_SUCCESS) {
1119 return ldb_module_done(ac->req, NULL, NULL, ret);
1120 }
1121 }
1122 }
1123 if (data && data->password_attrs) {
1124 if (ac->user_type != SECURITY_SYSTEM) {
1125 for (i = 0; data->password_attrs[i]; i++) {
1126 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1127 }
1128 }
1129 }
1130 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1131
1132 case LDB_REPLY_REFERRAL:
1133 return ldb_module_send_referral(ac->req, ares->referral);
1134
1135 case LDB_REPLY_DONE:
1136 return ldb_module_done(ac->req, ares->controls,
1137 ares->response, LDB_SUCCESS);
1138
1139 }
1140 return LDB_SUCCESS;
1141 }
1142
1143 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1144 {
1145 struct ldb_context *ldb;
1146 struct acl_context *ac;
1147 struct ldb_request *down_req;
1148 struct acl_private *data;
1149 int ret, i;
1150
1151 ldb = ldb_module_get_ctx(module);
1152
1153 ac = talloc_zero(req, struct acl_context);
1154 if (ac == NULL) {
1155 ldb_oom(ldb);
1156 return LDB_ERR_OPERATIONS_ERROR;
1157 }
1158 data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1159
1160 ac->module = module;
1161 ac->req = req;
1162 ac->user_type = what_is_user(module);
1163 ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1164 ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1165 ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1166 ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1167 ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1168
1169 /* replace any attributes in the parse tree that are private,
1170 so we don't allow a search for 'userPassword=penguin',
1171 just as we would not allow that attribute to be returned */
1172 if (ac->user_type != SECURITY_SYSTEM) {
1173 /* FIXME: We should copy the tree and keep the original unmodified. */
1174 /* remove password attributes */
1175 if (data && data->password_attrs) {
1176 for (i = 0; data->password_attrs[i]; i++) {
1177 ldb_parse_tree_attr_replace(req->op.search.tree,
1178 data->password_attrs[i],
1179 "kludgeACLredactedattribute");
1180 }
1181 }
1182 }
1183 ret = ldb_build_search_req_ex(&down_req,
1184 ldb, ac,
1185 req->op.search.base,
1186 req->op.search.scope,
1187 req->op.search.tree,
1188 req->op.search.attrs,
1189 req->controls,
1190 ac, acl_search_callback,
1191 req);
1192 if (ret != LDB_SUCCESS) {
1193 return ret;
1194 }
1195 /* perform the search */
1196 return ldb_next_request(module, down_req);
1197 }
1198
1199 _PUBLIC_ const struct ldb_module_ops ldb_acl_module_ops = {
1200 .name = "acl",
1201 .search = acl_search,
1202 .add = acl_add,
1203 .modify = acl_modify,
1204 .del = acl_delete,
1205 .rename = acl_rename,
1206 .init_context = acl_module_init
1207 };
reg import