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dsdb-acl: use acl_check_access_on_objectclass() instead of acl_check_access_on_class()
[Samba/gebeck_regimport.git] / source4 / dsdb / samdb / ldb_modules / acl.c
bloba3f43032be2818d49d062165acb3b71b8cdb94c1
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 "dsdb/samdb/samdb.h"
39 #include "librpc/gen_ndr/ndr_security.h"
40 #include "param/param.h"
41 #include "dsdb/samdb/ldb_modules/util.h"
42 #include "lib/util/tsort.h"
43 #include "system/kerberos.h"
44 #include "auth/kerberos/kerberos.h"
45
46 struct extended_access_check_attribute {
47 const char *oa_name;
48 const uint32_t requires_rights;
49 };
50
51 struct acl_private {
52 bool acl_search;
53 const char **password_attrs;
54 void *cached_schema_ptr;
55 uint64_t cached_schema_metadata_usn;
56 uint64_t cached_schema_loaded_usn;
57 const char **confidential_attrs;
58 };
59
60 struct acl_context {
61 struct ldb_module *module;
62 struct ldb_request *req;
63 bool am_system;
64 bool am_administrator;
65 bool modify_search;
66 bool constructed_attrs;
67 bool allowedAttributes;
68 bool allowedAttributesEffective;
69 bool allowedChildClasses;
70 bool allowedChildClassesEffective;
71 bool sDRightsEffective;
72 bool userPassword;
73 const char * const *attrs;
74 struct dsdb_schema *schema;
75 };
76
77 static int acl_module_init(struct ldb_module *module)
78 {
79 struct ldb_context *ldb;
80 struct acl_private *data;
81 int ret;
82 unsigned int i, n, j;
83 TALLOC_CTX *mem_ctx;
84 static const char * const attrs[] = { "passwordAttribute", NULL };
85 static const char * const secret_attrs[] = {
86 DSDB_SECRET_ATTRIBUTES
87 };
88 struct ldb_result *res;
89 struct ldb_message *msg;
90 struct ldb_message_element *password_attributes;
91
92 ldb = ldb_module_get_ctx(module);
93
94 ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
95 if (ret != LDB_SUCCESS) {
96 ldb_debug(ldb, LDB_DEBUG_ERROR,
97 "acl_module_init: Unable to register control with rootdse!\n");
98 return ldb_operr(ldb);
99 }
100
101 data = talloc_zero(module, struct acl_private);
102 if (data == NULL) {
103 return ldb_oom(ldb);
104 }
105
106 data->acl_search = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
107 NULL, "acl", "search", true);
108 ldb_module_set_private(module, data);
109
110 mem_ctx = talloc_new(module);
111 if (!mem_ctx) {
112 return ldb_oom(ldb);
113 }
114
115 ret = dsdb_module_search_dn(module, mem_ctx, &res,
116 ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
117 attrs,
118 DSDB_FLAG_NEXT_MODULE |
119 DSDB_FLAG_AS_SYSTEM,
120 NULL);
121 if (ret != LDB_SUCCESS) {
122 goto done;
123 }
124 if (res->count == 0) {
125 goto done;
126 }
127
128 if (res->count > 1) {
129 talloc_free(mem_ctx);
130 return LDB_ERR_CONSTRAINT_VIOLATION;
131 }
132
133 msg = res->msgs[0];
134
135 password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
136 if (!password_attributes) {
137 goto done;
138 }
139 data->password_attrs = talloc_array(data, const char *,
140 password_attributes->num_values +
141 ARRAY_SIZE(secret_attrs) + 1);
142 if (!data->password_attrs) {
143 talloc_free(mem_ctx);
144 return ldb_oom(ldb);
145 }
146
147 n = 0;
148 for (i=0; i < password_attributes->num_values; i++) {
149 data->password_attrs[n] = (const char *)password_attributes->values[i].data;
150 talloc_steal(data->password_attrs, password_attributes->values[i].data);
151 n++;
152 }
153
154 for (i=0; i < ARRAY_SIZE(secret_attrs); i++) {
155 bool found = false;
156
157 for (j=0; j < n; j++) {
158 if (strcasecmp(data->password_attrs[j], secret_attrs[i]) == 0) {
159 found = true;
160 break;
161 }
162 }
163
164 if (found) {
165 continue;
166 }
167
168 data->password_attrs[n] = talloc_strdup(data->password_attrs,
169 secret_attrs[i]);
170 if (data->password_attrs[n] == NULL) {
171 talloc_free(mem_ctx);
172 return ldb_oom(ldb);
173 }
174 n++;
175 }
176 data->password_attrs[n] = NULL;
177
178 done:
179 talloc_free(mem_ctx);
180 return ldb_next_init(module);
181 }
182
183 static int acl_allowedAttributes(struct ldb_module *module,
184 const struct dsdb_schema *schema,
185 struct ldb_message *sd_msg,
186 struct ldb_message *msg,
187 struct acl_context *ac)
188 {
189 struct ldb_message_element *oc_el;
190 struct ldb_context *ldb = ldb_module_get_ctx(module);
191 TALLOC_CTX *mem_ctx;
192 const char **attr_list;
193 int i, ret;
194 const struct dsdb_class *objectclass;
195
196 /* If we don't have a schema yet, we can't do anything... */
197 if (schema == NULL) {
198 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
199 return LDB_ERR_OPERATIONS_ERROR;
200 }
201
202 /* Must remove any existing attribute */
203 if (ac->allowedAttributes) {
204 ldb_msg_remove_attr(msg, "allowedAttributes");
205 }
206
207 mem_ctx = talloc_new(msg);
208 if (!mem_ctx) {
209 return ldb_oom(ldb);
210 }
211
212 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
213 attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
214 if (!attr_list) {
215 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
216 talloc_free(mem_ctx);
217 return LDB_ERR_OPERATIONS_ERROR;
218 }
219
220 /*
221 * Get the top-most structural object class for the ACL check
222 */
223 objectclass = dsdb_get_last_structural_class(ac->schema,
224 oc_el);
225 if (objectclass == NULL) {
226 ldb_asprintf_errstring(ldb, "acl_read: Failed to find a structural class for %s",
227 ldb_dn_get_linearized(sd_msg->dn));
228 talloc_free(mem_ctx);
229 return LDB_ERR_OPERATIONS_ERROR;
230 }
231
232 if (ac->allowedAttributes) {
233 for (i=0; attr_list && attr_list[i]; i++) {
234 ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
235 }
236 }
237 if (ac->allowedAttributesEffective) {
238 struct security_descriptor *sd;
239 struct dom_sid *sid = NULL;
240 struct ldb_control *as_system = ldb_request_get_control(ac->req,
241 LDB_CONTROL_AS_SYSTEM_OID);
242
243 if (as_system != NULL) {
244 as_system->critical = 0;
245 }
246
247 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
248 if (ac->am_system || as_system) {
249 for (i=0; attr_list && attr_list[i]; i++) {
250 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
251 }
252 return LDB_SUCCESS;
253 }
254
255 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
256
257 if (ret != LDB_SUCCESS) {
258 return ret;
259 }
260
261 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
262 for (i=0; attr_list && attr_list[i]; i++) {
263 const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
264 attr_list[i]);
265 if (!attr) {
266 return ldb_operr(ldb);
267 }
268 /* remove constructed attributes */
269 if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
270 || attr->systemOnly
271 || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
272 continue;
273 }
274 ret = acl_check_access_on_attribute(module,
275 msg,
276 sd,
277 sid,
278 SEC_ADS_WRITE_PROP,
279 attr,
280 objectclass);
281 if (ret == LDB_SUCCESS) {
282 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
283 }
284 }
285 }
286 return LDB_SUCCESS;
287 }
288
289 static int acl_childClasses(struct ldb_module *module,
290 const struct dsdb_schema *schema,
291 struct ldb_message *sd_msg,
292 struct ldb_message *msg,
293 const char *attrName)
294 {
295 struct ldb_message_element *oc_el;
296 struct ldb_message_element *allowedClasses;
297 const struct dsdb_class *sclass;
298 unsigned int i, j;
299 int ret;
300
301 /* If we don't have a schema yet, we can't do anything... */
302 if (schema == NULL) {
303 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
304 return LDB_ERR_OPERATIONS_ERROR;
305 }
306
307 /* Must remove any existing attribute, or else confusion reins */
308 ldb_msg_remove_attr(msg, attrName);
309 ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
310 if (ret != LDB_SUCCESS) {
311 return ret;
312 }
313
314 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
315
316 for (i=0; oc_el && i < oc_el->num_values; i++) {
317 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
318 if (!sclass) {
319 /* We don't know this class? what is going on? */
320 continue;
321 }
322
323 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
324 ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
325 }
326 }
327 if (allowedClasses->num_values > 1) {
328 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
329 for (i=1 ; i < allowedClasses->num_values; i++) {
330 struct ldb_val *val1 = &allowedClasses->values[i-1];
331 struct ldb_val *val2 = &allowedClasses->values[i];
332 if (data_blob_cmp(val1, val2) == 0) {
333 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
334 allowedClasses->num_values--;
335 i--;
336 }
337 }
338 }
339
340 return LDB_SUCCESS;
341 }
342
343 static int acl_check_access_on_class(struct ldb_module *module,
344 const struct dsdb_schema *schema,
345 TALLOC_CTX *mem_ctx,
346 struct security_descriptor *sd,
347 struct security_token *token,
348 struct dom_sid *rp_sid,
349 uint32_t access_mask,
350 const char *class_name)
351 {
352 int ret;
353 NTSTATUS status;
354 uint32_t access_granted;
355 struct object_tree *root = NULL;
356 struct object_tree *new_node = NULL;
357 const struct GUID *guid;
358
359 if (class_name != NULL) {
360 guid = class_schemaid_guid_by_lDAPDisplayName(schema, class_name);
361 if (!guid) {
362 DEBUG(10, ("acl_search: cannot find class %s\n",
363 class_name));
364 goto fail;
365 }
366 if (!insert_in_object_tree(mem_ctx,
367 guid, access_mask,
368 &root, &new_node)) {
369 DEBUG(10, ("acl_search: cannot add to object tree guid\n"));
370 goto fail;
371 }
372 }
373
374 status = sec_access_check_ds(sd, token,
375 access_mask,
376 &access_granted,
377 root,
378 rp_sid);
379 if (!NT_STATUS_IS_OK(status)) {
380 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
381 } else {
382 ret = LDB_SUCCESS;
383 }
384 return ret;
385 fail:
386 return ldb_operr(ldb_module_get_ctx(module));
387 }
388
389 static int acl_childClassesEffective(struct ldb_module *module,
390 const struct dsdb_schema *schema,
391 struct ldb_message *sd_msg,
392 struct ldb_message *msg,
393 struct acl_context *ac)
394 {
395 struct ldb_message_element *oc_el;
396 struct ldb_message_element *allowedClasses = NULL;
397 const struct dsdb_class *sclass;
398 struct security_descriptor *sd;
399 struct ldb_control *as_system = ldb_request_get_control(ac->req,
400 LDB_CONTROL_AS_SYSTEM_OID);
401 struct dom_sid *sid = NULL;
402 unsigned int i, j;
403 int ret;
404
405 if (as_system != NULL) {
406 as_system->critical = 0;
407 }
408
409 if (ac->am_system || as_system) {
410 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
411 }
412
413 /* If we don't have a schema yet, we can't do anything... */
414 if (schema == NULL) {
415 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
416 return LDB_ERR_OPERATIONS_ERROR;
417 }
418
419 /* Must remove any existing attribute, or else confusion reins */
420 ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
421
422 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
423 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
424 if (ret != LDB_SUCCESS) {
425 return ret;
426 }
427
428 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
429 for (i=0; oc_el && i < oc_el->num_values; i++) {
430 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
431 if (!sclass) {
432 /* We don't know this class? what is going on? */
433 continue;
434 }
435
436 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
437 const struct dsdb_class *sc;
438
439 sc = dsdb_class_by_lDAPDisplayName(schema,
440 sclass->possibleInferiors[j]);
441 if (!sc) {
442 /* We don't know this class? what is going on? */
443 continue;
444 }
445
446 ret = acl_check_access_on_objectclass(module, ac,
447 sd, sid,
448 SEC_ADS_CREATE_CHILD,
449 sc);
450 if (ret == LDB_SUCCESS) {
451 ldb_msg_add_string(msg, "allowedChildClassesEffective",
452 sclass->possibleInferiors[j]);
453 }
454 }
455 }
456 allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
457 if (!allowedClasses) {
458 return LDB_SUCCESS;
459 }
460
461 if (allowedClasses->num_values > 1) {
462 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
463 for (i=1 ; i < allowedClasses->num_values; i++) {
464 struct ldb_val *val1 = &allowedClasses->values[i-1];
465 struct ldb_val *val2 = &allowedClasses->values[i];
466 if (data_blob_cmp(val1, val2) == 0) {
467 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
468 allowedClasses->num_values--;
469 i--;
470 }
471 }
472 }
473 return LDB_SUCCESS;
474 }
475
476 static int acl_sDRightsEffective(struct ldb_module *module,
477 struct ldb_message *sd_msg,
478 struct ldb_message *msg,
479 struct acl_context *ac)
480 {
481 struct ldb_context *ldb = ldb_module_get_ctx(module);
482 struct ldb_message_element *rightsEffective;
483 int ret;
484 struct security_descriptor *sd;
485 struct ldb_control *as_system = ldb_request_get_control(ac->req,
486 LDB_CONTROL_AS_SYSTEM_OID);
487 struct dom_sid *sid = NULL;
488 uint32_t flags = 0;
489
490 if (as_system != NULL) {
491 as_system->critical = 0;
492 }
493
494 /* Must remove any existing attribute, or else confusion reins */
495 ldb_msg_remove_attr(msg, "sDRightsEffective");
496 ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
497 if (ret != LDB_SUCCESS) {
498 return ret;
499 }
500 if (ac->am_system || as_system) {
501 flags = SECINFO_OWNER | SECINFO_GROUP | SECINFO_SACL | SECINFO_DACL;
502 } else {
503 const struct dsdb_class *objectclass;
504 const struct dsdb_attribute *attr;
505
506 objectclass = dsdb_get_structural_oc_from_msg(ac->schema, sd_msg);
507 if (objectclass == NULL) {
508 return ldb_operr(ldb);
509 }
510
511 attr = dsdb_attribute_by_lDAPDisplayName(ac->schema,
512 "nTSecurityDescriptor");
513 if (attr == NULL) {
514 return ldb_operr(ldb);
515 }
516
517 /* Get the security descriptor from the message */
518 ret = dsdb_get_sd_from_ldb_message(ldb, msg, sd_msg, &sd);
519 if (ret != LDB_SUCCESS) {
520 return ret;
521 }
522 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
523 ret = acl_check_access_on_attribute(module,
524 msg,
525 sd,
526 sid,
527 SEC_STD_WRITE_OWNER,
528 attr,
529 objectclass);
530 if (ret == LDB_SUCCESS) {
531 flags |= SECINFO_OWNER | SECINFO_GROUP;
532 }
533 ret = acl_check_access_on_attribute(module,
534 msg,
535 sd,
536 sid,
537 SEC_STD_WRITE_DAC,
538 attr,
539 objectclass);
540 if (ret == LDB_SUCCESS) {
541 flags |= SECINFO_DACL;
542 }
543 ret = acl_check_access_on_attribute(module,
544 msg,
545 sd,
546 sid,
547 SEC_FLAG_SYSTEM_SECURITY,
548 attr,
549 objectclass);
550 if (ret == LDB_SUCCESS) {
551 flags |= SECINFO_SACL;
552 }
553 }
554 return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
555 "sDRightsEffective", flags);
556 }
557
558 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
559 struct ldb_context *ldb,
560 const char *spn_value,
561 uint32_t userAccountControl,
562 const char *samAccountName,
563 const char *dnsHostName,
564 const char *netbios_name,
565 const char *ntds_guid)
566 {
567 int ret;
568 krb5_context krb_ctx;
569 krb5_error_code kerr;
570 krb5_principal principal;
571 char *instanceName;
572 char *serviceType;
573 char *serviceName;
574 const char *forest_name = samdb_forest_name(ldb, mem_ctx);
575 const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
576 struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
577 struct loadparm_context);
578 bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
579 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
580
581 if (strcasecmp_m(spn_value, samAccountName) == 0) {
582 /* MacOS X sets this value, and setting an SPN of your
583 * own samAccountName is both pointless and safe */
584 return LDB_SUCCESS;
585 }
586
587 kerr = smb_krb5_init_context_basic(mem_ctx,
588 lp_ctx,
589 &krb_ctx);
590 if (kerr != 0) {
591 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
592 "Could not initialize kerberos context.");
593 }
594
595 ret = krb5_parse_name(krb_ctx, spn_value, &principal);
596 if (ret) {
597 krb5_free_context(krb_ctx);
598 return LDB_ERR_CONSTRAINT_VIOLATION;
599 }
600
601 if (principal->name.name_string.len < 2) {
602 goto fail;
603 }
604
605 instanceName = principal->name.name_string.val[1];
606 serviceType = principal->name.name_string.val[0];
607 if (principal->name.name_string.len == 3) {
608 serviceName = principal->name.name_string.val[2];
609 } else {
610 serviceName = NULL;
611 }
612
613 if (serviceName) {
614 if (!is_dc) {
615 goto fail;
616 }
617 if (strcasecmp(serviceType, "ldap") == 0) {
618 if (strcasecmp(serviceName, netbios_name) != 0 &&
619 strcasecmp(serviceName, forest_name) != 0) {
620 goto fail;
621 }
622
623 } else if (strcasecmp(serviceType, "gc") == 0) {
624 if (strcasecmp(serviceName, forest_name) != 0) {
625 goto fail;
626 }
627 } else {
628 if (strcasecmp(serviceName, base_domain) != 0 &&
629 strcasecmp(serviceName, netbios_name) != 0) {
630 goto fail;
631 }
632 }
633 }
634 /* instanceName can be samAccountName without $ or dnsHostName
635 * or "ntds_guid._msdcs.forest_domain for DC objects */
636 if (strlen(instanceName) == (strlen(samAccountName) - 1)
637 && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
638 goto success;
639 } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
640 goto success;
641 } else if (is_dc) {
642 const char *guid_str;
643 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
644 ntds_guid,
645 forest_name);
646 if (strcasecmp(instanceName, guid_str) == 0) {
647 goto success;
648 }
649 }
650
651 fail:
652 krb5_free_principal(krb_ctx, principal);
653 krb5_free_context(krb_ctx);
654 return LDB_ERR_CONSTRAINT_VIOLATION;
655
656 success:
657 krb5_free_principal(krb_ctx, principal);
658 krb5_free_context(krb_ctx);
659 return LDB_SUCCESS;
660 }
661
662 static int acl_check_spn(TALLOC_CTX *mem_ctx,
663 struct ldb_module *module,
664 struct ldb_request *req,
665 struct security_descriptor *sd,
666 struct dom_sid *sid,
667 const struct dsdb_attribute *attr,
668 const struct dsdb_class *objectclass)
669 {
670 int ret;
671 unsigned int i;
672 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
673 struct ldb_context *ldb = ldb_module_get_ctx(module);
674 struct ldb_result *acl_res;
675 struct ldb_result *netbios_res;
676 struct ldb_message_element *el;
677 struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
678 uint32_t userAccountControl;
679 const char *samAccountName;
680 const char *dnsHostName;
681 const char *netbios_name;
682 struct GUID ntds;
683 char *ntds_guid = NULL;
684
685 static const char *acl_attrs[] = {
686 "samAccountName",
687 "dnsHostName",
688 "userAccountControl",
689 NULL
690 };
691 static const char *netbios_attrs[] = {
692 "nETBIOSName",
693 NULL
694 };
695
696 /* if we have wp, we can do whatever we like */
697 if (acl_check_access_on_attribute(module,
698 tmp_ctx,
699 sd,
700 sid,
701 SEC_ADS_WRITE_PROP,
702 attr, objectclass) == LDB_SUCCESS) {
703 talloc_free(tmp_ctx);
704 return LDB_SUCCESS;
705 }
706
707 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
708 GUID_DRS_VALIDATE_SPN,
709 SEC_ADS_SELF_WRITE,
710 sid);
711
712 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
713 dsdb_acl_debug(sd, acl_user_token(module),
714 req->op.mod.message->dn,
715 true,
716 10);
717 talloc_free(tmp_ctx);
718 return ret;
719 }
720
721 ret = dsdb_module_search_dn(module, tmp_ctx,
722 &acl_res, req->op.mod.message->dn,
723 acl_attrs,
724 DSDB_FLAG_NEXT_MODULE |
725 DSDB_FLAG_AS_SYSTEM |
726 DSDB_SEARCH_SHOW_RECYCLED,
727 req);
728 if (ret != LDB_SUCCESS) {
729 talloc_free(tmp_ctx);
730 return ret;
731 }
732
733 userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
734 dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
735 samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
736
737 ret = dsdb_module_search(module, tmp_ctx,
738 &netbios_res, partitions_dn,
739 LDB_SCOPE_ONELEVEL,
740 netbios_attrs,
741 DSDB_FLAG_NEXT_MODULE |
742 DSDB_FLAG_AS_SYSTEM,
743 req,
744 "(ncName=%s)",
745 ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
746
747 netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
748
749 el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
750 if (!el) {
751 talloc_free(tmp_ctx);
752 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
753 "Error finding element for servicePrincipalName.");
754 }
755
756 /* NTDSDSA objectGuid of object we are checking SPN for */
757 if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
758 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
759 req->op.mod.message->dn, &ntds, req);
760 if (ret != LDB_SUCCESS) {
761 ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
762 ldb_dn_get_linearized(req->op.mod.message->dn),
763 ldb_strerror(ret));
764 talloc_free(tmp_ctx);
765 return LDB_ERR_OPERATIONS_ERROR;
766 }
767 ntds_guid = GUID_string(tmp_ctx, &ntds);
768 }
769
770 for (i=0; i < el->num_values; i++) {
771 ret = acl_validate_spn_value(tmp_ctx,
772 ldb,
773 (char *)el->values[i].data,
774 userAccountControl,
775 samAccountName,
776 dnsHostName,
777 netbios_name,
778 ntds_guid);
779 if (ret != LDB_SUCCESS) {
780 talloc_free(tmp_ctx);
781 return ret;
782 }
783 }
784 talloc_free(tmp_ctx);
785 return LDB_SUCCESS;
786 }
787
788 static int acl_add(struct ldb_module *module, struct ldb_request *req)
789 {
790 int ret;
791 struct ldb_dn *parent;
792 struct ldb_context *ldb;
793 const struct dsdb_schema *schema;
794 const struct dsdb_class *objectclass;
795 struct ldb_dn *nc_root;
796 struct ldb_control *as_system;
797
798 if (ldb_dn_is_special(req->op.add.message->dn)) {
799 return ldb_next_request(module, req);
800 }
801
802 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
803 if (as_system != NULL) {
804 as_system->critical = 0;
805 }
806
807 if (dsdb_module_am_system(module) || as_system) {
808 return ldb_next_request(module, req);
809 }
810
811 ldb = ldb_module_get_ctx(module);
812
813 parent = ldb_dn_get_parent(req, req->op.add.message->dn);
814 if (parent == NULL) {
815 return ldb_oom(ldb);
816 }
817
818 /* Creating an NC. There is probably something we should do here,
819 * but we will establish that later */
820
821 ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
822 if (ret != LDB_SUCCESS) {
823 return ret;
824 }
825 if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
826 talloc_free(nc_root);
827 return ldb_next_request(module, req);
828 }
829 talloc_free(nc_root);
830
831 schema = dsdb_get_schema(ldb, req);
832 if (!schema) {
833 return ldb_operr(ldb);
834 }
835
836 objectclass = dsdb_get_structural_oc_from_msg(schema, req->op.add.message);
837 if (!objectclass) {
838 ldb_asprintf_errstring(ldb_module_get_ctx(module),
839 "acl: unable to find or validate structrual objectClass on %s\n",
840 ldb_dn_get_linearized(req->op.add.message->dn));
841 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
842 }
843
844 ret = dsdb_module_check_access_on_dn(module, req, parent,
845 SEC_ADS_CREATE_CHILD,
846 &objectclass->schemaIDGUID, req);
847 if (ret != LDB_SUCCESS) {
848 return ret;
849 }
850 return ldb_next_request(module, req);
851 }
852
853 /* ckecks if modifications are allowed on "Member" attribute */
854 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
855 struct ldb_module *module,
856 struct ldb_request *req,
857 struct security_descriptor *sd,
858 struct dom_sid *sid,
859 const struct dsdb_attribute *attr,
860 const struct dsdb_class *objectclass)
861 {
862 int ret;
863 unsigned int i;
864 struct ldb_context *ldb = ldb_module_get_ctx(module);
865 struct ldb_dn *user_dn;
866 struct ldb_message_element *member_el;
867 /* if we have wp, we can do whatever we like */
868 if (acl_check_access_on_attribute(module,
869 mem_ctx,
870 sd,
871 sid,
872 SEC_ADS_WRITE_PROP,
873 attr, objectclass) == LDB_SUCCESS) {
874 return LDB_SUCCESS;
875 }
876 /* if we are adding/deleting ourselves, check for self membership */
877 ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
878 &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
879 &user_dn);
880 if (ret != LDB_SUCCESS) {
881 return ret;
882 }
883 member_el = ldb_msg_find_element(req->op.mod.message, "member");
884 if (!member_el) {
885 return ldb_operr(ldb);
886 }
887 /* user can only remove oneself */
888 if (member_el->num_values == 0) {
889 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
890 }
891 for (i = 0; i < member_el->num_values; i++) {
892 if (strcasecmp((const char *)member_el->values[i].data,
893 ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
894 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
895 }
896 }
897 ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
898 GUID_DRS_SELF_MEMBERSHIP,
899 SEC_ADS_SELF_WRITE,
900 sid);
901 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
902 dsdb_acl_debug(sd, acl_user_token(module),
903 req->op.mod.message->dn,
904 true,
905 10);
906 }
907 return ret;
908 }
909
910 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
911 struct ldb_module *module,
912 struct ldb_request *req,
913 struct security_descriptor *sd,
914 struct dom_sid *sid,
915 const struct dsdb_class *objectclass,
916 bool userPassword)
917 {
918 int ret = LDB_SUCCESS;
919 unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
920 struct ldb_message_element *el;
921 struct ldb_message *msg;
922 const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
923 "unicodePwd", "dBCSPwd", NULL }, **l;
924 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
925
926 msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
927 if (msg == NULL) {
928 return ldb_module_oom(module);
929 }
930 for (l = passwordAttrs; *l != NULL; l++) {
931 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
932 continue;
933 }
934
935 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
936 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
937 ++del_attr_cnt;
938 }
939 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
940 ++add_attr_cnt;
941 }
942 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
943 ++rep_attr_cnt;
944 }
945 ldb_msg_remove_element(msg, el);
946 }
947 }
948
949 /* single deletes will be handled by the "password_hash" LDB module
950 * later in the stack, so we let it though here */
951 if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
952 talloc_free(tmp_ctx);
953 return LDB_SUCCESS;
954 }
955
956 if (ldb_request_get_control(req,
957 DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
958 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
959 * have a user password change and not a set as the message
960 * looks like. In it's value blob it contains the NT and/or LM
961 * hash of the old password specified by the user.
962 * This control is used by the SAMR and "kpasswd" password
963 * change mechanisms. */
964 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
965 GUID_DRS_USER_CHANGE_PASSWORD,
966 SEC_ADS_CONTROL_ACCESS,
967 sid);
968 }
969 else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
970 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
971 GUID_DRS_FORCE_CHANGE_PASSWORD,
972 SEC_ADS_CONTROL_ACCESS,
973 sid);
974 }
975 else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
976 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
977 GUID_DRS_USER_CHANGE_PASSWORD,
978 SEC_ADS_CONTROL_ACCESS,
979 sid);
980 /* Very strange, but we get constraint violation in this case */
981 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
982 ret = LDB_ERR_CONSTRAINT_VIOLATION;
983 }
984 }
985 if (ret != LDB_SUCCESS) {
986 dsdb_acl_debug(sd, acl_user_token(module),
987 req->op.mod.message->dn,
988 true,
989 10);
990 }
991 talloc_free(tmp_ctx);
992 return ret;
993 }
994
995
996 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
997 {
998 int ret;
999 struct ldb_context *ldb = ldb_module_get_ctx(module);
1000 const struct dsdb_schema *schema;
1001 unsigned int i;
1002 const struct dsdb_class *objectclass;
1003 uint32_t access_granted;
1004 NTSTATUS status;
1005 struct ldb_result *acl_res;
1006 struct security_descriptor *sd;
1007 struct dom_sid *sid = NULL;
1008 struct ldb_control *as_system;
1009 bool userPassword;
1010 TALLOC_CTX *tmp_ctx;
1011 const struct ldb_message *msg = req->op.mod.message;
1012 static const char *acl_attrs[] = {
1013 "nTSecurityDescriptor",
1014 "objectClass",
1015 "objectSid",
1016 NULL
1017 };
1018
1019 if (ldb_dn_is_special(msg->dn)) {
1020 return ldb_next_request(module, req);
1021 }
1022
1023 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1024 if (as_system != NULL) {
1025 as_system->critical = 0;
1026 }
1027
1028 /* Don't print this debug statement if elements[0].name is going to be NULL */
1029 if (msg->num_elements > 0) {
1030 DEBUG(10, ("ldb:acl_modify: %s\n", msg->elements[0].name));
1031 }
1032 if (dsdb_module_am_system(module) || as_system) {
1033 return ldb_next_request(module, req);
1034 }
1035
1036 tmp_ctx = talloc_new(req);
1037 if (tmp_ctx == NULL) {
1038 return ldb_oom(ldb);
1039 }
1040
1041 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, msg->dn,
1042 acl_attrs,
1043 DSDB_FLAG_NEXT_MODULE |
1044 DSDB_FLAG_AS_SYSTEM |
1045 DSDB_SEARCH_SHOW_RECYCLED,
1046 req);
1047
1048 if (ret != LDB_SUCCESS) {
1049 goto fail;
1050 }
1051
1052 userPassword = dsdb_user_password_support(module, req, req);
1053
1054 schema = dsdb_get_schema(ldb, tmp_ctx);
1055 if (!schema) {
1056 talloc_free(tmp_ctx);
1057 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1058 "acl_modify: Error obtaining schema.");
1059 }
1060
1061 ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
1062 if (ret != LDB_SUCCESS) {
1063 talloc_free(tmp_ctx);
1064 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1065 "acl_modify: Error retrieving security descriptor.");
1066 }
1067 /* Theoretically we pass the check if the object has no sd */
1068 if (!sd) {
1069 goto success;
1070 }
1071
1072 objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1073 if (!objectclass) {
1074 talloc_free(tmp_ctx);
1075 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1076 "acl_modify: Error retrieving object class for GUID.");
1077 }
1078 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1079 for (i=0; i < msg->num_elements; i++) {
1080 const struct ldb_message_element *el = &msg->elements[i];
1081 const struct dsdb_attribute *attr;
1082
1083 /*
1084 * This basic attribute existence check with the right errorcode
1085 * is needed since this module is the first one which requests
1086 * schema attribute information.
1087 * The complete attribute checking is done in the
1088 * "objectclass_attrs" module behind this one.
1089 *
1090 * NOTE: "clearTextPassword" is not defined in the schema.
1091 */
1092 attr = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1093 if (!attr && ldb_attr_cmp("clearTextPassword", el->name) != 0) {
1094 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' "
1095 "on entry '%s' was not found in the schema!",
1096 req->op.mod.message->elements[i].name,
1097 ldb_dn_get_linearized(req->op.mod.message->dn));
1098 ret = LDB_ERR_NO_SUCH_ATTRIBUTE;
1099 goto fail;
1100 }
1101
1102 if (ldb_attr_cmp("nTSecurityDescriptor", el->name) == 0) {
1103 uint32_t sd_flags = dsdb_request_sd_flags(req, NULL);
1104 uint32_t access_mask = 0;
1105
1106 if (sd_flags & (SECINFO_OWNER|SECINFO_GROUP)) {
1107 access_mask |= SEC_STD_WRITE_OWNER;
1108 }
1109 if (sd_flags & SECINFO_DACL) {
1110 access_mask |= SEC_STD_WRITE_DAC;
1111 }
1112 if (sd_flags & SECINFO_SACL) {
1113 access_mask |= SEC_FLAG_SYSTEM_SECURITY;
1114 }
1115
1116 status = sec_access_check_ds(sd, acl_user_token(module),
1117 access_mask,
1118 &access_granted,
1119 NULL,
1120 sid);
1121
1122 if (!NT_STATUS_IS_OK(status)) {
1123 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1124 "Object %s has no write dacl access\n",
1125 ldb_dn_get_linearized(msg->dn));
1126 dsdb_acl_debug(sd,
1127 acl_user_token(module),
1128 msg->dn,
1129 true,
1130 10);
1131 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1132 goto fail;
1133 }
1134 } else if (ldb_attr_cmp("member", el->name) == 0) {
1135 ret = acl_check_self_membership(tmp_ctx,
1136 module,
1137 req,
1138 sd,
1139 sid,
1140 attr,
1141 objectclass);
1142 if (ret != LDB_SUCCESS) {
1143 goto fail;
1144 }
1145 } else if (ldb_attr_cmp("dBCSPwd", el->name) == 0) {
1146 /* this one is not affected by any rights, we should let it through
1147 so that passwords_hash returns the correct error */
1148 continue;
1149 } else if (ldb_attr_cmp("unicodePwd", el->name) == 0 ||
1150 (userPassword && ldb_attr_cmp("userPassword", el->name) == 0) ||
1151 ldb_attr_cmp("clearTextPassword", el->name) == 0) {
1152 ret = acl_check_password_rights(tmp_ctx,
1153 module,
1154 req,
1155 sd,
1156 sid,
1157 objectclass,
1158 userPassword);
1159 if (ret != LDB_SUCCESS) {
1160 goto fail;
1161 }
1162 } else if (ldb_attr_cmp("servicePrincipalName", el->name) == 0) {
1163 ret = acl_check_spn(tmp_ctx,
1164 module,
1165 req,
1166 sd,
1167 sid,
1168 attr,
1169 objectclass);
1170 if (ret != LDB_SUCCESS) {
1171 goto fail;
1172 }
1173 } else {
1174 struct object_tree *root = NULL;
1175 struct object_tree *new_node = NULL;
1176
1177 if (!insert_in_object_tree(tmp_ctx,
1178 &objectclass->schemaIDGUID,
1179 SEC_ADS_WRITE_PROP,
1180 &root, &new_node)) {
1181 talloc_free(tmp_ctx);
1182 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1183 "acl_modify: Error adding new node in object tree.");
1184 }
1185
1186 if (!insert_in_object_tree(tmp_ctx,
1187 &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1188 &new_node, &new_node)) {
1189 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1190 "acl_modify: cannot add to object tree securityGUID\n");
1191 ret = LDB_ERR_OPERATIONS_ERROR;
1192 goto fail;
1193 }
1194
1195 if (!insert_in_object_tree(tmp_ctx,
1196 &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1197 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1198 "acl_modify: cannot add to object tree attributeGUID\n");
1199 ret = LDB_ERR_OPERATIONS_ERROR;
1200 goto fail;
1201 }
1202
1203 status = sec_access_check_ds(sd, acl_user_token(module),
1204 SEC_ADS_WRITE_PROP,
1205 &access_granted,
1206 root,
1207 sid);
1208 if (!NT_STATUS_IS_OK(status)) {
1209 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1210 "Object %s has no write property access\n",
1211 ldb_dn_get_linearized(msg->dn));
1212 dsdb_acl_debug(sd,
1213 acl_user_token(module),
1214 msg->dn,
1215 true,
1216 10);
1217 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1218 goto fail;
1219 }
1220 }
1221 }
1222
1223 success:
1224 talloc_free(tmp_ctx);
1225 return ldb_next_request(module, req);
1226 fail:
1227 talloc_free(tmp_ctx);
1228 return ret;
1229 }
1230
1231 /* similar to the modify for the time being.
1232 * We need to consider the special delete tree case, though - TODO */
1233 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1234 {
1235 int ret;
1236 struct ldb_dn *parent;
1237 struct ldb_context *ldb;
1238 struct ldb_dn *nc_root;
1239 struct ldb_control *as_system;
1240
1241 if (ldb_dn_is_special(req->op.del.dn)) {
1242 return ldb_next_request(module, req);
1243 }
1244
1245 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1246 if (as_system != NULL) {
1247 as_system->critical = 0;
1248 }
1249
1250 if (dsdb_module_am_system(module) || as_system) {
1251 return ldb_next_request(module, req);
1252 }
1253
1254 DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1255
1256 ldb = ldb_module_get_ctx(module);
1257
1258 parent = ldb_dn_get_parent(req, req->op.del.dn);
1259 if (parent == NULL) {
1260 return ldb_oom(ldb);
1261 }
1262
1263 /* Make sure we aren't deleting a NC */
1264
1265 ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1266 if (ret != LDB_SUCCESS) {
1267 return ret;
1268 }
1269 if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1270 talloc_free(nc_root);
1271 DEBUG(10,("acl:deleting a NC\n"));
1272 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1273 return ldb_module_done(req, NULL, NULL,
1274 LDB_ERR_UNWILLING_TO_PERFORM);
1275 }
1276 talloc_free(nc_root);
1277
1278 if (ldb_request_get_control(req, LDB_CONTROL_TREE_DELETE_OID)) {
1279 ret = dsdb_module_check_access_on_dn(module, req,
1280 req->op.del.dn,
1281 SEC_ADS_DELETE_TREE, NULL,
1282 req);
1283 if (ret != LDB_SUCCESS) {
1284 return ret;
1285 }
1286
1287 return ldb_next_request(module, req);
1288 }
1289
1290 /* First check if we have delete object right */
1291 ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1292 SEC_STD_DELETE, NULL, req);
1293 if (ret == LDB_SUCCESS) {
1294 return ldb_next_request(module, req);
1295 }
1296
1297 /* Nope, we don't have delete object. Lets check if we have delete
1298 * child on the parent */
1299 ret = dsdb_module_check_access_on_dn(module, req, parent,
1300 SEC_ADS_DELETE_CHILD, NULL, req);
1301 if (ret != LDB_SUCCESS) {
1302 return ret;
1303 }
1304
1305 return ldb_next_request(module, req);
1306 }
1307
1308 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1309 {
1310 int ret;
1311 struct ldb_dn *oldparent;
1312 struct ldb_dn *newparent;
1313 const struct dsdb_schema *schema;
1314 const struct dsdb_class *objectclass;
1315 struct ldb_context *ldb;
1316 struct security_descriptor *sd = NULL;
1317 struct dom_sid *sid = NULL;
1318 struct ldb_result *acl_res;
1319 const struct GUID *guid;
1320 struct ldb_dn *nc_root;
1321 struct object_tree *root = NULL;
1322 struct object_tree *new_node = NULL;
1323 struct ldb_control *as_system;
1324 TALLOC_CTX *tmp_ctx;
1325 NTSTATUS status;
1326 uint32_t access_granted;
1327 const char *rdn_name;
1328 static const char *acl_attrs[] = {
1329 "nTSecurityDescriptor",
1330 "objectClass",
1331 "objectSid",
1332 NULL
1333 };
1334
1335 if (ldb_dn_is_special(req->op.rename.olddn)) {
1336 return ldb_next_request(module, req);
1337 }
1338
1339 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1340 if (as_system != NULL) {
1341 as_system->critical = 0;
1342 }
1343
1344 DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1345 if (dsdb_module_am_system(module) || as_system) {
1346 return ldb_next_request(module, req);
1347 }
1348
1349 ldb = ldb_module_get_ctx(module);
1350
1351 tmp_ctx = talloc_new(req);
1352 if (tmp_ctx == NULL) {
1353 return ldb_oom(ldb);
1354 }
1355
1356 oldparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.olddn);
1357 if (oldparent == NULL) {
1358 return ldb_oom(ldb);
1359 }
1360 newparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.newdn);
1361 if (newparent == NULL) {
1362 return ldb_oom(ldb);
1363 }
1364
1365 /* Make sure we aren't renaming/moving a NC */
1366
1367 ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1368 if (ret != LDB_SUCCESS) {
1369 return ret;
1370 }
1371 if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1372 talloc_free(nc_root);
1373 DEBUG(10,("acl:renaming/moving a NC\n"));
1374 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1375 return ldb_module_done(req, NULL, NULL,
1376 LDB_ERR_UNWILLING_TO_PERFORM);
1377 }
1378 talloc_free(nc_root);
1379
1380 /* Look for the parent */
1381
1382 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1383 req->op.rename.olddn, acl_attrs,
1384 DSDB_FLAG_NEXT_MODULE |
1385 DSDB_FLAG_AS_SYSTEM |
1386 DSDB_SEARCH_SHOW_RECYCLED, req);
1387 /* we sould be able to find the parent */
1388 if (ret != LDB_SUCCESS) {
1389 DEBUG(10,("acl: failed to find object %s\n",
1390 ldb_dn_get_linearized(req->op.rename.olddn)));
1391 talloc_free(tmp_ctx);
1392 return ret;
1393 }
1394
1395 schema = dsdb_get_schema(ldb, acl_res);
1396 if (!schema) {
1397 talloc_free(tmp_ctx);
1398 return ldb_operr(ldb);
1399 }
1400
1401 objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1402 if (!objectclass) {
1403 talloc_free(tmp_ctx);
1404 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1405 "acl_modify: Error retrieving object class for GUID.");
1406 }
1407
1408 if (!insert_in_object_tree(tmp_ctx, &objectclass->schemaIDGUID, SEC_ADS_WRITE_PROP,
1409 &root, &new_node)) {
1410 talloc_free(tmp_ctx);
1411 return ldb_operr(ldb);
1412 }
1413
1414 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1415 "name");
1416 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1417 &new_node, &new_node)) {
1418 talloc_free(tmp_ctx);
1419 return ldb_operr(ldb);
1420 }
1421
1422 rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1423 if (rdn_name == NULL) {
1424 talloc_free(tmp_ctx);
1425 return ldb_operr(ldb);
1426 }
1427 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1428 rdn_name);
1429 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1430 &new_node, &new_node)) {
1431 talloc_free(tmp_ctx);
1432 return ldb_operr(ldb);
1433 };
1434
1435 ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1436
1437 if (ret != LDB_SUCCESS) {
1438 talloc_free(tmp_ctx);
1439 return ldb_operr(ldb);
1440 }
1441 /* Theoretically we pass the check if the object has no sd */
1442 if (!sd) {
1443 talloc_free(tmp_ctx);
1444 return LDB_SUCCESS;
1445 }
1446 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1447 status = sec_access_check_ds(sd, acl_user_token(module),
1448 SEC_ADS_WRITE_PROP,
1449 &access_granted,
1450 root,
1451 sid);
1452
1453 if (!NT_STATUS_IS_OK(status)) {
1454 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1455 "Object %s has no wp on name\n",
1456 ldb_dn_get_linearized(req->op.rename.olddn));
1457 dsdb_acl_debug(sd,
1458 acl_user_token(module),
1459 req->op.rename.olddn,
1460 true,
1461 10);
1462 talloc_free(tmp_ctx);
1463 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1464 }
1465
1466 if (ldb_dn_compare(oldparent, newparent) == 0) {
1467 /* regular rename, not move, nothing more to do */
1468 talloc_free(tmp_ctx);
1469 return ldb_next_request(module, req);
1470 }
1471
1472 /* new parent should have create child */
1473 root = NULL;
1474 new_node = NULL;
1475
1476 ret = dsdb_module_check_access_on_dn(module, req, newparent,
1477 SEC_ADS_CREATE_CHILD,
1478 &objectclass->schemaIDGUID, req);
1479 if (ret != LDB_SUCCESS) {
1480 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1481 "acl:access_denied renaming %s",
1482 ldb_dn_get_linearized(req->op.rename.olddn));
1483 talloc_free(tmp_ctx);
1484 return ret;
1485 }
1486 /* do we have delete object on the object? */
1487
1488 status = sec_access_check_ds(sd, acl_user_token(module),
1489 SEC_STD_DELETE,
1490 &access_granted,
1491 NULL,
1492 sid);
1493
1494 if (NT_STATUS_IS_OK(status)) {
1495 talloc_free(tmp_ctx);
1496 return ldb_next_request(module, req);
1497 }
1498 /* what about delete child on the current parent */
1499 ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1500 if (ret != LDB_SUCCESS) {
1501 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1502 "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1503 talloc_free(tmp_ctx);
1504 return ldb_module_done(req, NULL, NULL, ret);
1505 }
1506
1507 talloc_free(tmp_ctx);
1508
1509 return ldb_next_request(module, req);
1510 }
1511
1512 static int acl_search_update_confidential_attrs(struct acl_context *ac,
1513 struct acl_private *data)
1514 {
1515 struct dsdb_attribute *a;
1516 uint32_t n = 0;
1517
1518 if (data->acl_search) {
1519 /*
1520 * If acl:search is activated, the acl_read module
1521 * protects confidential attributes.
1522 */
1523 return LDB_SUCCESS;
1524 }
1525
1526 if ((ac->schema == data->cached_schema_ptr) &&
1527 (ac->schema->loaded_usn == data->cached_schema_loaded_usn) &&
1528 (ac->schema->metadata_usn == data->cached_schema_metadata_usn))
1529 {
1530 return LDB_SUCCESS;
1531 }
1532
1533 data->cached_schema_ptr = NULL;
1534 data->cached_schema_loaded_usn = 0;
1535 data->cached_schema_metadata_usn = 0;
1536 TALLOC_FREE(data->confidential_attrs);
1537
1538 if (ac->schema == NULL) {
1539 return LDB_SUCCESS;
1540 }
1541
1542 for (a = ac->schema->attributes; a; a = a->next) {
1543 const char **attrs = data->confidential_attrs;
1544
1545 if (!(a->searchFlags & SEARCH_FLAG_CONFIDENTIAL)) {
1546 continue;
1547 }
1548
1549 attrs = talloc_realloc(data, attrs, const char *, n + 2);
1550 if (attrs == NULL) {
1551 TALLOC_FREE(data->confidential_attrs);
1552 return ldb_module_oom(ac->module);
1553 }
1554
1555 attrs[n] = a->lDAPDisplayName;
1556 attrs[n+1] = NULL;
1557 n++;
1558
1559 data->confidential_attrs = attrs;
1560 }
1561
1562 data->cached_schema_ptr = ac->schema;
1563 data->cached_schema_loaded_usn = ac->schema->loaded_usn;
1564 data->cached_schema_metadata_usn = ac->schema->metadata_usn;
1565
1566 return LDB_SUCCESS;
1567 }
1568
1569 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1570 {
1571 struct acl_context *ac;
1572 struct acl_private *data;
1573 struct ldb_result *acl_res;
1574 static const char *acl_attrs[] = {
1575 "objectClass",
1576 "nTSecurityDescriptor",
1577 "objectSid",
1578 NULL
1579 };
1580 int ret;
1581 unsigned int i;
1582
1583 ac = talloc_get_type(req->context, struct acl_context);
1584 data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1585 if (!ares) {
1586 return ldb_module_done(ac->req, NULL, NULL,
1587 LDB_ERR_OPERATIONS_ERROR);
1588 }
1589 if (ares->error != LDB_SUCCESS) {
1590 return ldb_module_done(ac->req, ares->controls,
1591 ares->response, ares->error);
1592 }
1593
1594 switch (ares->type) {
1595 case LDB_REPLY_ENTRY:
1596 if (ac->constructed_attrs) {
1597 ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1598 acl_attrs,
1599 DSDB_FLAG_NEXT_MODULE |
1600 DSDB_FLAG_AS_SYSTEM |
1601 DSDB_SEARCH_SHOW_RECYCLED,
1602 req);
1603 if (ret != LDB_SUCCESS) {
1604 return ldb_module_done(ac->req, NULL, NULL, ret);
1605 }
1606 }
1607
1608 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1609 ret = acl_allowedAttributes(ac->module, ac->schema,
1610 acl_res->msgs[0],
1611 ares->message, ac);
1612 if (ret != LDB_SUCCESS) {
1613 return ldb_module_done(ac->req, NULL, NULL, ret);
1614 }
1615 }
1616
1617 if (ac->allowedChildClasses) {
1618 ret = acl_childClasses(ac->module, ac->schema,
1619 acl_res->msgs[0],
1620 ares->message,
1621 "allowedChildClasses");
1622 if (ret != LDB_SUCCESS) {
1623 return ldb_module_done(ac->req, NULL, NULL, ret);
1624 }
1625 }
1626
1627 if (ac->allowedChildClassesEffective) {
1628 ret = acl_childClassesEffective(ac->module, ac->schema,
1629 acl_res->msgs[0],
1630 ares->message, ac);
1631 if (ret != LDB_SUCCESS) {
1632 return ldb_module_done(ac->req, NULL, NULL, ret);
1633 }
1634 }
1635
1636 if (ac->sDRightsEffective) {
1637 ret = acl_sDRightsEffective(ac->module,
1638 acl_res->msgs[0],
1639 ares->message, ac);
1640 if (ret != LDB_SUCCESS) {
1641 return ldb_module_done(ac->req, NULL, NULL, ret);
1642 }
1643 }
1644
1645 if (data == NULL) {
1646 return ldb_module_send_entry(ac->req, ares->message,
1647 ares->controls);
1648 }
1649
1650 if (ac->am_system) {
1651 return ldb_module_send_entry(ac->req, ares->message,
1652 ares->controls);
1653 }
1654
1655 if (data->password_attrs != NULL) {
1656 for (i = 0; data->password_attrs[i]; i++) {
1657 if ((!ac->userPassword) &&
1658 (ldb_attr_cmp(data->password_attrs[i],
1659 "userPassword") == 0))
1660 {
1661 continue;
1662 }
1663
1664 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1665 }
1666 }
1667
1668 if (ac->am_administrator) {
1669 return ldb_module_send_entry(ac->req, ares->message,
1670 ares->controls);
1671 }
1672
1673 ret = acl_search_update_confidential_attrs(ac, data);
1674 if (ret != LDB_SUCCESS) {
1675 return ret;
1676 }
1677
1678 if (data->confidential_attrs != NULL) {
1679 for (i = 0; data->confidential_attrs[i]; i++) {
1680 ldb_msg_remove_attr(ares->message,
1681 data->confidential_attrs[i]);
1682 }
1683 }
1684
1685 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1686
1687 case LDB_REPLY_REFERRAL:
1688 return ldb_module_send_referral(ac->req, ares->referral);
1689
1690 case LDB_REPLY_DONE:
1691 return ldb_module_done(ac->req, ares->controls,
1692 ares->response, LDB_SUCCESS);
1693
1694 }
1695 return LDB_SUCCESS;
1696 }
1697
1698 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1699 {
1700 struct ldb_context *ldb;
1701 struct acl_context *ac;
1702 struct ldb_parse_tree *down_tree;
1703 struct ldb_request *down_req;
1704 struct acl_private *data;
1705 int ret;
1706 unsigned int i;
1707
1708 if (ldb_dn_is_special(req->op.search.base)) {
1709 return ldb_next_request(module, req);
1710 }
1711
1712 ldb = ldb_module_get_ctx(module);
1713
1714 ac = talloc_zero(req, struct acl_context);
1715 if (ac == NULL) {
1716 return ldb_oom(ldb);
1717 }
1718 data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1719
1720 ac->module = module;
1721 ac->req = req;
1722 ac->am_system = dsdb_module_am_system(module);
1723 ac->am_administrator = dsdb_module_am_administrator(module);
1724 ac->constructed_attrs = false;
1725 ac->modify_search = true;
1726 ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1727 ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1728 ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1729 ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1730 ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1731 ac->userPassword = true;
1732 ac->schema = dsdb_get_schema(ldb, ac);
1733
1734 ac->constructed_attrs |= ac->allowedAttributes;
1735 ac->constructed_attrs |= ac->allowedChildClasses;
1736 ac->constructed_attrs |= ac->allowedChildClassesEffective;
1737 ac->constructed_attrs |= ac->allowedAttributesEffective;
1738 ac->constructed_attrs |= ac->sDRightsEffective;
1739
1740 if (data == NULL) {
1741 ac->modify_search = false;
1742 }
1743 if (ac->am_system) {
1744 ac->modify_search = false;
1745 }
1746
1747 if (!ac->constructed_attrs && !ac->modify_search) {
1748 talloc_free(ac);
1749 return ldb_next_request(module, req);
1750 }
1751
1752 if (!ac->am_system) {
1753 ac->userPassword = dsdb_user_password_support(module, ac, req);
1754 }
1755
1756 ret = acl_search_update_confidential_attrs(ac, data);
1757 if (ret != LDB_SUCCESS) {
1758 return ret;
1759 }
1760
1761 down_tree = ldb_parse_tree_copy_shallow(ac, req->op.search.tree);
1762 if (down_tree == NULL) {
1763 return ldb_oom(ldb);
1764 }
1765
1766 if (!ac->am_system && data->password_attrs) {
1767 for (i = 0; data->password_attrs[i]; i++) {
1768 if ((!ac->userPassword) &&
1769 (ldb_attr_cmp(data->password_attrs[i],
1770 "userPassword") == 0))
1771 {
1772 continue;
1773 }
1774
1775 ldb_parse_tree_attr_replace(down_tree,
1776 data->password_attrs[i],
1777 "kludgeACLredactedattribute");
1778 }
1779 }
1780
1781 if (!ac->am_system && !ac->am_administrator && data->confidential_attrs) {
1782 for (i = 0; data->confidential_attrs[i]; i++) {
1783 ldb_parse_tree_attr_replace(down_tree,
1784 data->confidential_attrs[i],
1785 "kludgeACLredactedattribute");
1786 }
1787 }
1788
1789 ret = ldb_build_search_req_ex(&down_req,
1790 ldb, ac,
1791 req->op.search.base,
1792 req->op.search.scope,
1793 down_tree,
1794 req->op.search.attrs,
1795 req->controls,
1796 ac, acl_search_callback,
1797 req);
1798 LDB_REQ_SET_LOCATION(down_req);
1799 if (ret != LDB_SUCCESS) {
1800 return ret;
1801 }
1802 /* perform the search */
1803 return ldb_next_request(module, down_req);
1804 }
1805
1806 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1807 {
1808 struct ldb_context *ldb = ldb_module_get_ctx(module);
1809 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1810
1811 /* allow everybody to read the sequence number */
1812 if (strcmp(req->op.extended.oid,
1813 LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1814 return ldb_next_request(module, req);
1815 }
1816
1817 if (dsdb_module_am_system(module) ||
1818 dsdb_module_am_administrator(module) || as_system) {
1819 return ldb_next_request(module, req);
1820 } else {
1821 ldb_asprintf_errstring(ldb,
1822 "acl_extended: "
1823 "attempted database modify not permitted. "
1824 "User %s is not SYSTEM or an administrator",
1825 acl_user_name(req, module));
1826 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1827 }
1828 }
1829
1830 static const struct ldb_module_ops ldb_acl_module_ops = {
1831 .name = "acl",
1832 .search = acl_search,
1833 .add = acl_add,
1834 .modify = acl_modify,
1835 .del = acl_delete,
1836 .rename = acl_rename,
1837 .extended = acl_extended,
1838 .init_context = acl_module_init
1839 };
1840
1841 int ldb_acl_module_init(const char *version)
1842 {
1843 LDB_MODULE_CHECK_VERSION(version);
1844 return ldb_register_module(&ldb_acl_module_ops);
1845 }
reg import