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dsdb-acl: Pass the structural objectClass into acl_check_access_on_attribute
[Samba/vl.git] / source4 / dsdb / samdb / ldb_modules / acl.c
blob638955de97902784304ac328e2433f59c5c9604b
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 ret = acl_check_access_on_class(module,
438 schema,
439 msg,
440 sd,
441 acl_user_token(module),
442 sid,
443 SEC_ADS_CREATE_CHILD,
444 sclass->possibleInferiors[j]);
445 if (ret == LDB_SUCCESS) {
446 ldb_msg_add_string(msg, "allowedChildClassesEffective",
447 sclass->possibleInferiors[j]);
448 }
449 }
450 }
451 allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
452 if (!allowedClasses) {
453 return LDB_SUCCESS;
454 }
455
456 if (allowedClasses->num_values > 1) {
457 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
458 for (i=1 ; i < allowedClasses->num_values; i++) {
459 struct ldb_val *val1 = &allowedClasses->values[i-1];
460 struct ldb_val *val2 = &allowedClasses->values[i];
461 if (data_blob_cmp(val1, val2) == 0) {
462 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
463 allowedClasses->num_values--;
464 i--;
465 }
466 }
467 }
468 return LDB_SUCCESS;
469 }
470
471 static int acl_sDRightsEffective(struct ldb_module *module,
472 struct ldb_message *sd_msg,
473 struct ldb_message *msg,
474 struct acl_context *ac)
475 {
476 struct ldb_context *ldb = ldb_module_get_ctx(module);
477 struct ldb_message_element *rightsEffective;
478 int ret;
479 struct security_descriptor *sd;
480 struct ldb_control *as_system = ldb_request_get_control(ac->req,
481 LDB_CONTROL_AS_SYSTEM_OID);
482 struct dom_sid *sid = NULL;
483 uint32_t flags = 0;
484
485 if (as_system != NULL) {
486 as_system->critical = 0;
487 }
488
489 /* Must remove any existing attribute, or else confusion reins */
490 ldb_msg_remove_attr(msg, "sDRightsEffective");
491 ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
492 if (ret != LDB_SUCCESS) {
493 return ret;
494 }
495 if (ac->am_system || as_system) {
496 flags = SECINFO_OWNER | SECINFO_GROUP | SECINFO_SACL | SECINFO_DACL;
497 } else {
498 const struct dsdb_class *objectclass;
499 const struct dsdb_attribute *attr;
500
501 objectclass = dsdb_get_structural_oc_from_msg(ac->schema, sd_msg);
502 if (objectclass == NULL) {
503 return ldb_operr(ldb);
504 }
505
506 attr = dsdb_attribute_by_lDAPDisplayName(ac->schema,
507 "nTSecurityDescriptor");
508 if (attr == NULL) {
509 return ldb_operr(ldb);
510 }
511
512 /* Get the security descriptor from the message */
513 ret = dsdb_get_sd_from_ldb_message(ldb, msg, sd_msg, &sd);
514 if (ret != LDB_SUCCESS) {
515 return ret;
516 }
517 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
518 ret = acl_check_access_on_attribute(module,
519 msg,
520 sd,
521 sid,
522 SEC_STD_WRITE_OWNER,
523 attr,
524 objectclass);
525 if (ret == LDB_SUCCESS) {
526 flags |= SECINFO_OWNER | SECINFO_GROUP;
527 }
528 ret = acl_check_access_on_attribute(module,
529 msg,
530 sd,
531 sid,
532 SEC_STD_WRITE_DAC,
533 attr,
534 objectclass);
535 if (ret == LDB_SUCCESS) {
536 flags |= SECINFO_DACL;
537 }
538 ret = acl_check_access_on_attribute(module,
539 msg,
540 sd,
541 sid,
542 SEC_FLAG_SYSTEM_SECURITY,
543 attr,
544 objectclass);
545 if (ret == LDB_SUCCESS) {
546 flags |= SECINFO_SACL;
547 }
548 }
549 return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
550 "sDRightsEffective", flags);
551 }
552
553 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
554 struct ldb_context *ldb,
555 const char *spn_value,
556 uint32_t userAccountControl,
557 const char *samAccountName,
558 const char *dnsHostName,
559 const char *netbios_name,
560 const char *ntds_guid)
561 {
562 int ret;
563 krb5_context krb_ctx;
564 krb5_error_code kerr;
565 krb5_principal principal;
566 char *instanceName;
567 char *serviceType;
568 char *serviceName;
569 const char *forest_name = samdb_forest_name(ldb, mem_ctx);
570 const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
571 struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
572 struct loadparm_context);
573 bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
574 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
575
576 if (strcasecmp_m(spn_value, samAccountName) == 0) {
577 /* MacOS X sets this value, and setting an SPN of your
578 * own samAccountName is both pointless and safe */
579 return LDB_SUCCESS;
580 }
581
582 kerr = smb_krb5_init_context_basic(mem_ctx,
583 lp_ctx,
584 &krb_ctx);
585 if (kerr != 0) {
586 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
587 "Could not initialize kerberos context.");
588 }
589
590 ret = krb5_parse_name(krb_ctx, spn_value, &principal);
591 if (ret) {
592 krb5_free_context(krb_ctx);
593 return LDB_ERR_CONSTRAINT_VIOLATION;
594 }
595
596 if (principal->name.name_string.len < 2) {
597 goto fail;
598 }
599
600 instanceName = principal->name.name_string.val[1];
601 serviceType = principal->name.name_string.val[0];
602 if (principal->name.name_string.len == 3) {
603 serviceName = principal->name.name_string.val[2];
604 } else {
605 serviceName = NULL;
606 }
607
608 if (serviceName) {
609 if (!is_dc) {
610 goto fail;
611 }
612 if (strcasecmp(serviceType, "ldap") == 0) {
613 if (strcasecmp(serviceName, netbios_name) != 0 &&
614 strcasecmp(serviceName, forest_name) != 0) {
615 goto fail;
616 }
617
618 } else if (strcasecmp(serviceType, "gc") == 0) {
619 if (strcasecmp(serviceName, forest_name) != 0) {
620 goto fail;
621 }
622 } else {
623 if (strcasecmp(serviceName, base_domain) != 0 &&
624 strcasecmp(serviceName, netbios_name) != 0) {
625 goto fail;
626 }
627 }
628 }
629 /* instanceName can be samAccountName without $ or dnsHostName
630 * or "ntds_guid._msdcs.forest_domain for DC objects */
631 if (strlen(instanceName) == (strlen(samAccountName) - 1)
632 && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
633 goto success;
634 } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
635 goto success;
636 } else if (is_dc) {
637 const char *guid_str;
638 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
639 ntds_guid,
640 forest_name);
641 if (strcasecmp(instanceName, guid_str) == 0) {
642 goto success;
643 }
644 }
645
646 fail:
647 krb5_free_principal(krb_ctx, principal);
648 krb5_free_context(krb_ctx);
649 return LDB_ERR_CONSTRAINT_VIOLATION;
650
651 success:
652 krb5_free_principal(krb_ctx, principal);
653 krb5_free_context(krb_ctx);
654 return LDB_SUCCESS;
655 }
656
657 static int acl_check_spn(TALLOC_CTX *mem_ctx,
658 struct ldb_module *module,
659 struct ldb_request *req,
660 struct security_descriptor *sd,
661 struct dom_sid *sid,
662 const struct dsdb_attribute *attr,
663 const struct dsdb_class *objectclass)
664 {
665 int ret;
666 unsigned int i;
667 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
668 struct ldb_context *ldb = ldb_module_get_ctx(module);
669 struct ldb_result *acl_res;
670 struct ldb_result *netbios_res;
671 struct ldb_message_element *el;
672 struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
673 uint32_t userAccountControl;
674 const char *samAccountName;
675 const char *dnsHostName;
676 const char *netbios_name;
677 struct GUID ntds;
678 char *ntds_guid = NULL;
679
680 static const char *acl_attrs[] = {
681 "samAccountName",
682 "dnsHostName",
683 "userAccountControl",
684 NULL
685 };
686 static const char *netbios_attrs[] = {
687 "nETBIOSName",
688 NULL
689 };
690
691 /* if we have wp, we can do whatever we like */
692 if (acl_check_access_on_attribute(module,
693 tmp_ctx,
694 sd,
695 sid,
696 SEC_ADS_WRITE_PROP,
697 attr, objectclass) == LDB_SUCCESS) {
698 talloc_free(tmp_ctx);
699 return LDB_SUCCESS;
700 }
701
702 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
703 GUID_DRS_VALIDATE_SPN,
704 SEC_ADS_SELF_WRITE,
705 sid);
706
707 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
708 dsdb_acl_debug(sd, acl_user_token(module),
709 req->op.mod.message->dn,
710 true,
711 10);
712 talloc_free(tmp_ctx);
713 return ret;
714 }
715
716 ret = dsdb_module_search_dn(module, tmp_ctx,
717 &acl_res, req->op.mod.message->dn,
718 acl_attrs,
719 DSDB_FLAG_NEXT_MODULE |
720 DSDB_FLAG_AS_SYSTEM |
721 DSDB_SEARCH_SHOW_RECYCLED,
722 req);
723 if (ret != LDB_SUCCESS) {
724 talloc_free(tmp_ctx);
725 return ret;
726 }
727
728 userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
729 dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
730 samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
731
732 ret = dsdb_module_search(module, tmp_ctx,
733 &netbios_res, partitions_dn,
734 LDB_SCOPE_ONELEVEL,
735 netbios_attrs,
736 DSDB_FLAG_NEXT_MODULE |
737 DSDB_FLAG_AS_SYSTEM,
738 req,
739 "(ncName=%s)",
740 ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
741
742 netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
743
744 el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
745 if (!el) {
746 talloc_free(tmp_ctx);
747 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
748 "Error finding element for servicePrincipalName.");
749 }
750
751 /* NTDSDSA objectGuid of object we are checking SPN for */
752 if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
753 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
754 req->op.mod.message->dn, &ntds, req);
755 if (ret != LDB_SUCCESS) {
756 ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
757 ldb_dn_get_linearized(req->op.mod.message->dn),
758 ldb_strerror(ret));
759 talloc_free(tmp_ctx);
760 return LDB_ERR_OPERATIONS_ERROR;
761 }
762 ntds_guid = GUID_string(tmp_ctx, &ntds);
763 }
764
765 for (i=0; i < el->num_values; i++) {
766 ret = acl_validate_spn_value(tmp_ctx,
767 ldb,
768 (char *)el->values[i].data,
769 userAccountControl,
770 samAccountName,
771 dnsHostName,
772 netbios_name,
773 ntds_guid);
774 if (ret != LDB_SUCCESS) {
775 talloc_free(tmp_ctx);
776 return ret;
777 }
778 }
779 talloc_free(tmp_ctx);
780 return LDB_SUCCESS;
781 }
782
783 static int acl_add(struct ldb_module *module, struct ldb_request *req)
784 {
785 int ret;
786 struct ldb_dn *parent;
787 struct ldb_context *ldb;
788 const struct dsdb_schema *schema;
789 const struct dsdb_class *objectclass;
790 struct ldb_dn *nc_root;
791 struct ldb_control *as_system;
792
793 if (ldb_dn_is_special(req->op.add.message->dn)) {
794 return ldb_next_request(module, req);
795 }
796
797 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
798 if (as_system != NULL) {
799 as_system->critical = 0;
800 }
801
802 if (dsdb_module_am_system(module) || as_system) {
803 return ldb_next_request(module, req);
804 }
805
806 ldb = ldb_module_get_ctx(module);
807
808 parent = ldb_dn_get_parent(req, req->op.add.message->dn);
809 if (parent == NULL) {
810 return ldb_oom(ldb);
811 }
812
813 /* Creating an NC. There is probably something we should do here,
814 * but we will establish that later */
815
816 ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
817 if (ret != LDB_SUCCESS) {
818 return ret;
819 }
820 if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
821 talloc_free(nc_root);
822 return ldb_next_request(module, req);
823 }
824 talloc_free(nc_root);
825
826 schema = dsdb_get_schema(ldb, req);
827 if (!schema) {
828 return ldb_operr(ldb);
829 }
830
831 objectclass = dsdb_get_structural_oc_from_msg(schema, req->op.add.message);
832 if (!objectclass) {
833 ldb_asprintf_errstring(ldb_module_get_ctx(module),
834 "acl: unable to find or validate structrual objectClass on %s\n",
835 ldb_dn_get_linearized(req->op.add.message->dn));
836 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
837 }
838
839 ret = dsdb_module_check_access_on_dn(module, req, parent,
840 SEC_ADS_CREATE_CHILD,
841 &objectclass->schemaIDGUID, req);
842 if (ret != LDB_SUCCESS) {
843 return ret;
844 }
845 return ldb_next_request(module, req);
846 }
847
848 /* ckecks if modifications are allowed on "Member" attribute */
849 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
850 struct ldb_module *module,
851 struct ldb_request *req,
852 struct security_descriptor *sd,
853 struct dom_sid *sid,
854 const struct dsdb_attribute *attr,
855 const struct dsdb_class *objectclass)
856 {
857 int ret;
858 unsigned int i;
859 struct ldb_context *ldb = ldb_module_get_ctx(module);
860 struct ldb_dn *user_dn;
861 struct ldb_message_element *member_el;
862 /* if we have wp, we can do whatever we like */
863 if (acl_check_access_on_attribute(module,
864 mem_ctx,
865 sd,
866 sid,
867 SEC_ADS_WRITE_PROP,
868 attr, objectclass) == LDB_SUCCESS) {
869 return LDB_SUCCESS;
870 }
871 /* if we are adding/deleting ourselves, check for self membership */
872 ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
873 &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
874 &user_dn);
875 if (ret != LDB_SUCCESS) {
876 return ret;
877 }
878 member_el = ldb_msg_find_element(req->op.mod.message, "member");
879 if (!member_el) {
880 return ldb_operr(ldb);
881 }
882 /* user can only remove oneself */
883 if (member_el->num_values == 0) {
884 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
885 }
886 for (i = 0; i < member_el->num_values; i++) {
887 if (strcasecmp((const char *)member_el->values[i].data,
888 ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
889 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
890 }
891 }
892 ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
893 GUID_DRS_SELF_MEMBERSHIP,
894 SEC_ADS_SELF_WRITE,
895 sid);
896 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
897 dsdb_acl_debug(sd, acl_user_token(module),
898 req->op.mod.message->dn,
899 true,
900 10);
901 }
902 return ret;
903 }
904
905 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
906 struct ldb_module *module,
907 struct ldb_request *req,
908 struct security_descriptor *sd,
909 struct dom_sid *sid,
910 const struct dsdb_class *objectclass,
911 bool userPassword)
912 {
913 int ret = LDB_SUCCESS;
914 unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
915 struct ldb_message_element *el;
916 struct ldb_message *msg;
917 const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
918 "unicodePwd", "dBCSPwd", NULL }, **l;
919 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
920
921 msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
922 if (msg == NULL) {
923 return ldb_module_oom(module);
924 }
925 for (l = passwordAttrs; *l != NULL; l++) {
926 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
927 continue;
928 }
929
930 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
931 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
932 ++del_attr_cnt;
933 }
934 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
935 ++add_attr_cnt;
936 }
937 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
938 ++rep_attr_cnt;
939 }
940 ldb_msg_remove_element(msg, el);
941 }
942 }
943
944 /* single deletes will be handled by the "password_hash" LDB module
945 * later in the stack, so we let it though here */
946 if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
947 talloc_free(tmp_ctx);
948 return LDB_SUCCESS;
949 }
950
951 if (ldb_request_get_control(req,
952 DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
953 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
954 * have a user password change and not a set as the message
955 * looks like. In it's value blob it contains the NT and/or LM
956 * hash of the old password specified by the user.
957 * This control is used by the SAMR and "kpasswd" password
958 * change mechanisms. */
959 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
960 GUID_DRS_USER_CHANGE_PASSWORD,
961 SEC_ADS_CONTROL_ACCESS,
962 sid);
963 }
964 else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
965 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
966 GUID_DRS_FORCE_CHANGE_PASSWORD,
967 SEC_ADS_CONTROL_ACCESS,
968 sid);
969 }
970 else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
971 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
972 GUID_DRS_USER_CHANGE_PASSWORD,
973 SEC_ADS_CONTROL_ACCESS,
974 sid);
975 /* Very strange, but we get constraint violation in this case */
976 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
977 ret = LDB_ERR_CONSTRAINT_VIOLATION;
978 }
979 }
980 if (ret != LDB_SUCCESS) {
981 dsdb_acl_debug(sd, acl_user_token(module),
982 req->op.mod.message->dn,
983 true,
984 10);
985 }
986 talloc_free(tmp_ctx);
987 return ret;
988 }
989
990
991 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
992 {
993 int ret;
994 struct ldb_context *ldb = ldb_module_get_ctx(module);
995 const struct dsdb_schema *schema;
996 unsigned int i;
997 const struct dsdb_class *objectclass;
998 uint32_t access_granted;
999 NTSTATUS status;
1000 struct ldb_result *acl_res;
1001 struct security_descriptor *sd;
1002 struct dom_sid *sid = NULL;
1003 struct ldb_control *as_system;
1004 bool userPassword;
1005 TALLOC_CTX *tmp_ctx;
1006 const struct ldb_message *msg = req->op.mod.message;
1007 static const char *acl_attrs[] = {
1008 "nTSecurityDescriptor",
1009 "objectClass",
1010 "objectSid",
1011 NULL
1012 };
1013
1014 if (ldb_dn_is_special(msg->dn)) {
1015 return ldb_next_request(module, req);
1016 }
1017
1018 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1019 if (as_system != NULL) {
1020 as_system->critical = 0;
1021 }
1022
1023 /* Don't print this debug statement if elements[0].name is going to be NULL */
1024 if (msg->num_elements > 0) {
1025 DEBUG(10, ("ldb:acl_modify: %s\n", msg->elements[0].name));
1026 }
1027 if (dsdb_module_am_system(module) || as_system) {
1028 return ldb_next_request(module, req);
1029 }
1030
1031 tmp_ctx = talloc_new(req);
1032 if (tmp_ctx == NULL) {
1033 return ldb_oom(ldb);
1034 }
1035
1036 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, msg->dn,
1037 acl_attrs,
1038 DSDB_FLAG_NEXT_MODULE |
1039 DSDB_FLAG_AS_SYSTEM |
1040 DSDB_SEARCH_SHOW_RECYCLED,
1041 req);
1042
1043 if (ret != LDB_SUCCESS) {
1044 goto fail;
1045 }
1046
1047 userPassword = dsdb_user_password_support(module, req, req);
1048
1049 schema = dsdb_get_schema(ldb, tmp_ctx);
1050 if (!schema) {
1051 talloc_free(tmp_ctx);
1052 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1053 "acl_modify: Error obtaining schema.");
1054 }
1055
1056 ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
1057 if (ret != LDB_SUCCESS) {
1058 talloc_free(tmp_ctx);
1059 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1060 "acl_modify: Error retrieving security descriptor.");
1061 }
1062 /* Theoretically we pass the check if the object has no sd */
1063 if (!sd) {
1064 goto success;
1065 }
1066
1067 objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1068 if (!objectclass) {
1069 talloc_free(tmp_ctx);
1070 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1071 "acl_modify: Error retrieving object class for GUID.");
1072 }
1073 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1074 for (i=0; i < msg->num_elements; i++) {
1075 const struct ldb_message_element *el = &msg->elements[i];
1076 const struct dsdb_attribute *attr;
1077
1078 /*
1079 * This basic attribute existence check with the right errorcode
1080 * is needed since this module is the first one which requests
1081 * schema attribute information.
1082 * The complete attribute checking is done in the
1083 * "objectclass_attrs" module behind this one.
1084 *
1085 * NOTE: "clearTextPassword" is not defined in the schema.
1086 */
1087 attr = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1088 if (!attr && ldb_attr_cmp("clearTextPassword", el->name) != 0) {
1089 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' "
1090 "on entry '%s' was not found in the schema!",
1091 req->op.mod.message->elements[i].name,
1092 ldb_dn_get_linearized(req->op.mod.message->dn));
1093 ret = LDB_ERR_NO_SUCH_ATTRIBUTE;
1094 goto fail;
1095 }
1096
1097 if (ldb_attr_cmp("nTSecurityDescriptor", el->name) == 0) {
1098 uint32_t sd_flags = dsdb_request_sd_flags(req, NULL);
1099 uint32_t access_mask = 0;
1100
1101 if (sd_flags & (SECINFO_OWNER|SECINFO_GROUP)) {
1102 access_mask |= SEC_STD_WRITE_OWNER;
1103 }
1104 if (sd_flags & SECINFO_DACL) {
1105 access_mask |= SEC_STD_WRITE_DAC;
1106 }
1107 if (sd_flags & SECINFO_SACL) {
1108 access_mask |= SEC_FLAG_SYSTEM_SECURITY;
1109 }
1110
1111 status = sec_access_check_ds(sd, acl_user_token(module),
1112 access_mask,
1113 &access_granted,
1114 NULL,
1115 sid);
1116
1117 if (!NT_STATUS_IS_OK(status)) {
1118 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1119 "Object %s has no write dacl access\n",
1120 ldb_dn_get_linearized(msg->dn));
1121 dsdb_acl_debug(sd,
1122 acl_user_token(module),
1123 msg->dn,
1124 true,
1125 10);
1126 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1127 goto fail;
1128 }
1129 } else if (ldb_attr_cmp("member", el->name) == 0) {
1130 ret = acl_check_self_membership(tmp_ctx,
1131 module,
1132 req,
1133 sd,
1134 sid,
1135 attr,
1136 objectclass);
1137 if (ret != LDB_SUCCESS) {
1138 goto fail;
1139 }
1140 } else if (ldb_attr_cmp("dBCSPwd", el->name) == 0) {
1141 /* this one is not affected by any rights, we should let it through
1142 so that passwords_hash returns the correct error */
1143 continue;
1144 } else if (ldb_attr_cmp("unicodePwd", el->name) == 0 ||
1145 (userPassword && ldb_attr_cmp("userPassword", el->name) == 0) ||
1146 ldb_attr_cmp("clearTextPassword", el->name) == 0) {
1147 ret = acl_check_password_rights(tmp_ctx,
1148 module,
1149 req,
1150 sd,
1151 sid,
1152 objectclass,
1153 userPassword);
1154 if (ret != LDB_SUCCESS) {
1155 goto fail;
1156 }
1157 } else if (ldb_attr_cmp("servicePrincipalName", el->name) == 0) {
1158 ret = acl_check_spn(tmp_ctx,
1159 module,
1160 req,
1161 sd,
1162 sid,
1163 attr,
1164 objectclass);
1165 if (ret != LDB_SUCCESS) {
1166 goto fail;
1167 }
1168 } else {
1169 struct object_tree *root = NULL;
1170 struct object_tree *new_node = NULL;
1171
1172 if (!insert_in_object_tree(tmp_ctx,
1173 &objectclass->schemaIDGUID,
1174 SEC_ADS_WRITE_PROP,
1175 &root, &new_node)) {
1176 talloc_free(tmp_ctx);
1177 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1178 "acl_modify: Error adding new node in object tree.");
1179 }
1180
1181 if (!insert_in_object_tree(tmp_ctx,
1182 &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1183 &new_node, &new_node)) {
1184 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1185 "acl_modify: cannot add to object tree securityGUID\n");
1186 ret = LDB_ERR_OPERATIONS_ERROR;
1187 goto fail;
1188 }
1189
1190 if (!insert_in_object_tree(tmp_ctx,
1191 &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1192 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1193 "acl_modify: cannot add to object tree attributeGUID\n");
1194 ret = LDB_ERR_OPERATIONS_ERROR;
1195 goto fail;
1196 }
1197
1198 status = sec_access_check_ds(sd, acl_user_token(module),
1199 SEC_ADS_WRITE_PROP,
1200 &access_granted,
1201 root,
1202 sid);
1203 if (!NT_STATUS_IS_OK(status)) {
1204 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1205 "Object %s has no write property access\n",
1206 ldb_dn_get_linearized(msg->dn));
1207 dsdb_acl_debug(sd,
1208 acl_user_token(module),
1209 msg->dn,
1210 true,
1211 10);
1212 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1213 goto fail;
1214 }
1215 }
1216 }
1217
1218 success:
1219 talloc_free(tmp_ctx);
1220 return ldb_next_request(module, req);
1221 fail:
1222 talloc_free(tmp_ctx);
1223 return ret;
1224 }
1225
1226 /* similar to the modify for the time being.
1227 * We need to consider the special delete tree case, though - TODO */
1228 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1229 {
1230 int ret;
1231 struct ldb_dn *parent;
1232 struct ldb_context *ldb;
1233 struct ldb_dn *nc_root;
1234 struct ldb_control *as_system;
1235
1236 if (ldb_dn_is_special(req->op.del.dn)) {
1237 return ldb_next_request(module, req);
1238 }
1239
1240 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1241 if (as_system != NULL) {
1242 as_system->critical = 0;
1243 }
1244
1245 if (dsdb_module_am_system(module) || as_system) {
1246 return ldb_next_request(module, req);
1247 }
1248
1249 DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1250
1251 ldb = ldb_module_get_ctx(module);
1252
1253 parent = ldb_dn_get_parent(req, req->op.del.dn);
1254 if (parent == NULL) {
1255 return ldb_oom(ldb);
1256 }
1257
1258 /* Make sure we aren't deleting a NC */
1259
1260 ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1261 if (ret != LDB_SUCCESS) {
1262 return ret;
1263 }
1264 if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1265 talloc_free(nc_root);
1266 DEBUG(10,("acl:deleting a NC\n"));
1267 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1268 return ldb_module_done(req, NULL, NULL,
1269 LDB_ERR_UNWILLING_TO_PERFORM);
1270 }
1271 talloc_free(nc_root);
1272
1273 if (ldb_request_get_control(req, LDB_CONTROL_TREE_DELETE_OID)) {
1274 ret = dsdb_module_check_access_on_dn(module, req,
1275 req->op.del.dn,
1276 SEC_ADS_DELETE_TREE, NULL,
1277 req);
1278 if (ret != LDB_SUCCESS) {
1279 return ret;
1280 }
1281
1282 return ldb_next_request(module, req);
1283 }
1284
1285 /* First check if we have delete object right */
1286 ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1287 SEC_STD_DELETE, NULL, req);
1288 if (ret == LDB_SUCCESS) {
1289 return ldb_next_request(module, req);
1290 }
1291
1292 /* Nope, we don't have delete object. Lets check if we have delete
1293 * child on the parent */
1294 ret = dsdb_module_check_access_on_dn(module, req, parent,
1295 SEC_ADS_DELETE_CHILD, NULL, req);
1296 if (ret != LDB_SUCCESS) {
1297 return ret;
1298 }
1299
1300 return ldb_next_request(module, req);
1301 }
1302
1303 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1304 {
1305 int ret;
1306 struct ldb_dn *oldparent;
1307 struct ldb_dn *newparent;
1308 const struct dsdb_schema *schema;
1309 const struct dsdb_class *objectclass;
1310 struct ldb_context *ldb;
1311 struct security_descriptor *sd = NULL;
1312 struct dom_sid *sid = NULL;
1313 struct ldb_result *acl_res;
1314 const struct GUID *guid;
1315 struct ldb_dn *nc_root;
1316 struct object_tree *root = NULL;
1317 struct object_tree *new_node = NULL;
1318 struct ldb_control *as_system;
1319 TALLOC_CTX *tmp_ctx;
1320 NTSTATUS status;
1321 uint32_t access_granted;
1322 const char *rdn_name;
1323 static const char *acl_attrs[] = {
1324 "nTSecurityDescriptor",
1325 "objectClass",
1326 "objectSid",
1327 NULL
1328 };
1329
1330 if (ldb_dn_is_special(req->op.rename.olddn)) {
1331 return ldb_next_request(module, req);
1332 }
1333
1334 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1335 if (as_system != NULL) {
1336 as_system->critical = 0;
1337 }
1338
1339 DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1340 if (dsdb_module_am_system(module) || as_system) {
1341 return ldb_next_request(module, req);
1342 }
1343
1344 ldb = ldb_module_get_ctx(module);
1345
1346 tmp_ctx = talloc_new(req);
1347 if (tmp_ctx == NULL) {
1348 return ldb_oom(ldb);
1349 }
1350
1351 oldparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.olddn);
1352 if (oldparent == NULL) {
1353 return ldb_oom(ldb);
1354 }
1355 newparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.newdn);
1356 if (newparent == NULL) {
1357 return ldb_oom(ldb);
1358 }
1359
1360 /* Make sure we aren't renaming/moving a NC */
1361
1362 ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1363 if (ret != LDB_SUCCESS) {
1364 return ret;
1365 }
1366 if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1367 talloc_free(nc_root);
1368 DEBUG(10,("acl:renaming/moving a NC\n"));
1369 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1370 return ldb_module_done(req, NULL, NULL,
1371 LDB_ERR_UNWILLING_TO_PERFORM);
1372 }
1373 talloc_free(nc_root);
1374
1375 /* Look for the parent */
1376
1377 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1378 req->op.rename.olddn, acl_attrs,
1379 DSDB_FLAG_NEXT_MODULE |
1380 DSDB_FLAG_AS_SYSTEM |
1381 DSDB_SEARCH_SHOW_RECYCLED, req);
1382 /* we sould be able to find the parent */
1383 if (ret != LDB_SUCCESS) {
1384 DEBUG(10,("acl: failed to find object %s\n",
1385 ldb_dn_get_linearized(req->op.rename.olddn)));
1386 talloc_free(tmp_ctx);
1387 return ret;
1388 }
1389
1390 schema = dsdb_get_schema(ldb, acl_res);
1391 if (!schema) {
1392 talloc_free(tmp_ctx);
1393 return ldb_operr(ldb);
1394 }
1395
1396 objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1397 if (!objectclass) {
1398 talloc_free(tmp_ctx);
1399 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1400 "acl_modify: Error retrieving object class for GUID.");
1401 }
1402
1403 if (!insert_in_object_tree(tmp_ctx, &objectclass->schemaIDGUID, SEC_ADS_WRITE_PROP,
1404 &root, &new_node)) {
1405 talloc_free(tmp_ctx);
1406 return ldb_operr(ldb);
1407 }
1408
1409 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1410 "name");
1411 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1412 &new_node, &new_node)) {
1413 talloc_free(tmp_ctx);
1414 return ldb_operr(ldb);
1415 }
1416
1417 rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1418 if (rdn_name == NULL) {
1419 talloc_free(tmp_ctx);
1420 return ldb_operr(ldb);
1421 }
1422 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1423 rdn_name);
1424 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1425 &new_node, &new_node)) {
1426 talloc_free(tmp_ctx);
1427 return ldb_operr(ldb);
1428 };
1429
1430 ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1431
1432 if (ret != LDB_SUCCESS) {
1433 talloc_free(tmp_ctx);
1434 return ldb_operr(ldb);
1435 }
1436 /* Theoretically we pass the check if the object has no sd */
1437 if (!sd) {
1438 talloc_free(tmp_ctx);
1439 return LDB_SUCCESS;
1440 }
1441 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1442 status = sec_access_check_ds(sd, acl_user_token(module),
1443 SEC_ADS_WRITE_PROP,
1444 &access_granted,
1445 root,
1446 sid);
1447
1448 if (!NT_STATUS_IS_OK(status)) {
1449 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1450 "Object %s has no wp on name\n",
1451 ldb_dn_get_linearized(req->op.rename.olddn));
1452 dsdb_acl_debug(sd,
1453 acl_user_token(module),
1454 req->op.rename.olddn,
1455 true,
1456 10);
1457 talloc_free(tmp_ctx);
1458 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1459 }
1460
1461 if (ldb_dn_compare(oldparent, newparent) == 0) {
1462 /* regular rename, not move, nothing more to do */
1463 talloc_free(tmp_ctx);
1464 return ldb_next_request(module, req);
1465 }
1466
1467 /* new parent should have create child */
1468 root = NULL;
1469 new_node = NULL;
1470
1471 ret = dsdb_module_check_access_on_dn(module, req, newparent,
1472 SEC_ADS_CREATE_CHILD,
1473 &objectclass->schemaIDGUID, req);
1474 if (ret != LDB_SUCCESS) {
1475 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1476 "acl:access_denied renaming %s",
1477 ldb_dn_get_linearized(req->op.rename.olddn));
1478 talloc_free(tmp_ctx);
1479 return ret;
1480 }
1481 /* do we have delete object on the object? */
1482
1483 status = sec_access_check_ds(sd, acl_user_token(module),
1484 SEC_STD_DELETE,
1485 &access_granted,
1486 NULL,
1487 sid);
1488
1489 if (NT_STATUS_IS_OK(status)) {
1490 talloc_free(tmp_ctx);
1491 return ldb_next_request(module, req);
1492 }
1493 /* what about delete child on the current parent */
1494 ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1495 if (ret != LDB_SUCCESS) {
1496 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1497 "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1498 talloc_free(tmp_ctx);
1499 return ldb_module_done(req, NULL, NULL, ret);
1500 }
1501
1502 talloc_free(tmp_ctx);
1503
1504 return ldb_next_request(module, req);
1505 }
1506
1507 static int acl_search_update_confidential_attrs(struct acl_context *ac,
1508 struct acl_private *data)
1509 {
1510 struct dsdb_attribute *a;
1511 uint32_t n = 0;
1512
1513 if (data->acl_search) {
1514 /*
1515 * If acl:search is activated, the acl_read module
1516 * protects confidential attributes.
1517 */
1518 return LDB_SUCCESS;
1519 }
1520
1521 if ((ac->schema == data->cached_schema_ptr) &&
1522 (ac->schema->loaded_usn == data->cached_schema_loaded_usn) &&
1523 (ac->schema->metadata_usn == data->cached_schema_metadata_usn))
1524 {
1525 return LDB_SUCCESS;
1526 }
1527
1528 data->cached_schema_ptr = NULL;
1529 data->cached_schema_loaded_usn = 0;
1530 data->cached_schema_metadata_usn = 0;
1531 TALLOC_FREE(data->confidential_attrs);
1532
1533 if (ac->schema == NULL) {
1534 return LDB_SUCCESS;
1535 }
1536
1537 for (a = ac->schema->attributes; a; a = a->next) {
1538 const char **attrs = data->confidential_attrs;
1539
1540 if (!(a->searchFlags & SEARCH_FLAG_CONFIDENTIAL)) {
1541 continue;
1542 }
1543
1544 attrs = talloc_realloc(data, attrs, const char *, n + 2);
1545 if (attrs == NULL) {
1546 TALLOC_FREE(data->confidential_attrs);
1547 return ldb_module_oom(ac->module);
1548 }
1549
1550 attrs[n] = a->lDAPDisplayName;
1551 attrs[n+1] = NULL;
1552 n++;
1553
1554 data->confidential_attrs = attrs;
1555 }
1556
1557 data->cached_schema_ptr = ac->schema;
1558 data->cached_schema_loaded_usn = ac->schema->loaded_usn;
1559 data->cached_schema_metadata_usn = ac->schema->metadata_usn;
1560
1561 return LDB_SUCCESS;
1562 }
1563
1564 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1565 {
1566 struct acl_context *ac;
1567 struct acl_private *data;
1568 struct ldb_result *acl_res;
1569 static const char *acl_attrs[] = {
1570 "objectClass",
1571 "nTSecurityDescriptor",
1572 "objectSid",
1573 NULL
1574 };
1575 int ret;
1576 unsigned int i;
1577
1578 ac = talloc_get_type(req->context, struct acl_context);
1579 data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1580 if (!ares) {
1581 return ldb_module_done(ac->req, NULL, NULL,
1582 LDB_ERR_OPERATIONS_ERROR);
1583 }
1584 if (ares->error != LDB_SUCCESS) {
1585 return ldb_module_done(ac->req, ares->controls,
1586 ares->response, ares->error);
1587 }
1588
1589 switch (ares->type) {
1590 case LDB_REPLY_ENTRY:
1591 if (ac->constructed_attrs) {
1592 ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1593 acl_attrs,
1594 DSDB_FLAG_NEXT_MODULE |
1595 DSDB_FLAG_AS_SYSTEM |
1596 DSDB_SEARCH_SHOW_RECYCLED,
1597 req);
1598 if (ret != LDB_SUCCESS) {
1599 return ldb_module_done(ac->req, NULL, NULL, ret);
1600 }
1601 }
1602
1603 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1604 ret = acl_allowedAttributes(ac->module, ac->schema,
1605 acl_res->msgs[0],
1606 ares->message, ac);
1607 if (ret != LDB_SUCCESS) {
1608 return ldb_module_done(ac->req, NULL, NULL, ret);
1609 }
1610 }
1611
1612 if (ac->allowedChildClasses) {
1613 ret = acl_childClasses(ac->module, ac->schema,
1614 acl_res->msgs[0],
1615 ares->message,
1616 "allowedChildClasses");
1617 if (ret != LDB_SUCCESS) {
1618 return ldb_module_done(ac->req, NULL, NULL, ret);
1619 }
1620 }
1621
1622 if (ac->allowedChildClassesEffective) {
1623 ret = acl_childClassesEffective(ac->module, ac->schema,
1624 acl_res->msgs[0],
1625 ares->message, ac);
1626 if (ret != LDB_SUCCESS) {
1627 return ldb_module_done(ac->req, NULL, NULL, ret);
1628 }
1629 }
1630
1631 if (ac->sDRightsEffective) {
1632 ret = acl_sDRightsEffective(ac->module,
1633 acl_res->msgs[0],
1634 ares->message, ac);
1635 if (ret != LDB_SUCCESS) {
1636 return ldb_module_done(ac->req, NULL, NULL, ret);
1637 }
1638 }
1639
1640 if (data == NULL) {
1641 return ldb_module_send_entry(ac->req, ares->message,
1642 ares->controls);
1643 }
1644
1645 if (ac->am_system) {
1646 return ldb_module_send_entry(ac->req, ares->message,
1647 ares->controls);
1648 }
1649
1650 if (data->password_attrs != NULL) {
1651 for (i = 0; data->password_attrs[i]; i++) {
1652 if ((!ac->userPassword) &&
1653 (ldb_attr_cmp(data->password_attrs[i],
1654 "userPassword") == 0))
1655 {
1656 continue;
1657 }
1658
1659 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1660 }
1661 }
1662
1663 if (ac->am_administrator) {
1664 return ldb_module_send_entry(ac->req, ares->message,
1665 ares->controls);
1666 }
1667
1668 ret = acl_search_update_confidential_attrs(ac, data);
1669 if (ret != LDB_SUCCESS) {
1670 return ret;
1671 }
1672
1673 if (data->confidential_attrs != NULL) {
1674 for (i = 0; data->confidential_attrs[i]; i++) {
1675 ldb_msg_remove_attr(ares->message,
1676 data->confidential_attrs[i]);
1677 }
1678 }
1679
1680 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1681
1682 case LDB_REPLY_REFERRAL:
1683 return ldb_module_send_referral(ac->req, ares->referral);
1684
1685 case LDB_REPLY_DONE:
1686 return ldb_module_done(ac->req, ares->controls,
1687 ares->response, LDB_SUCCESS);
1688
1689 }
1690 return LDB_SUCCESS;
1691 }
1692
1693 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1694 {
1695 struct ldb_context *ldb;
1696 struct acl_context *ac;
1697 struct ldb_parse_tree *down_tree;
1698 struct ldb_request *down_req;
1699 struct acl_private *data;
1700 int ret;
1701 unsigned int i;
1702
1703 if (ldb_dn_is_special(req->op.search.base)) {
1704 return ldb_next_request(module, req);
1705 }
1706
1707 ldb = ldb_module_get_ctx(module);
1708
1709 ac = talloc_zero(req, struct acl_context);
1710 if (ac == NULL) {
1711 return ldb_oom(ldb);
1712 }
1713 data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1714
1715 ac->module = module;
1716 ac->req = req;
1717 ac->am_system = dsdb_module_am_system(module);
1718 ac->am_administrator = dsdb_module_am_administrator(module);
1719 ac->constructed_attrs = false;
1720 ac->modify_search = true;
1721 ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1722 ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1723 ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1724 ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1725 ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1726 ac->userPassword = true;
1727 ac->schema = dsdb_get_schema(ldb, ac);
1728
1729 ac->constructed_attrs |= ac->allowedAttributes;
1730 ac->constructed_attrs |= ac->allowedChildClasses;
1731 ac->constructed_attrs |= ac->allowedChildClassesEffective;
1732 ac->constructed_attrs |= ac->allowedAttributesEffective;
1733 ac->constructed_attrs |= ac->sDRightsEffective;
1734
1735 if (data == NULL) {
1736 ac->modify_search = false;
1737 }
1738 if (ac->am_system) {
1739 ac->modify_search = false;
1740 }
1741
1742 if (!ac->constructed_attrs && !ac->modify_search) {
1743 talloc_free(ac);
1744 return ldb_next_request(module, req);
1745 }
1746
1747 if (!ac->am_system) {
1748 ac->userPassword = dsdb_user_password_support(module, ac, req);
1749 }
1750
1751 ret = acl_search_update_confidential_attrs(ac, data);
1752 if (ret != LDB_SUCCESS) {
1753 return ret;
1754 }
1755
1756 down_tree = ldb_parse_tree_copy_shallow(ac, req->op.search.tree);
1757 if (down_tree == NULL) {
1758 return ldb_oom(ldb);
1759 }
1760
1761 if (!ac->am_system && data->password_attrs) {
1762 for (i = 0; data->password_attrs[i]; i++) {
1763 if ((!ac->userPassword) &&
1764 (ldb_attr_cmp(data->password_attrs[i],
1765 "userPassword") == 0))
1766 {
1767 continue;
1768 }
1769
1770 ldb_parse_tree_attr_replace(down_tree,
1771 data->password_attrs[i],
1772 "kludgeACLredactedattribute");
1773 }
1774 }
1775
1776 if (!ac->am_system && !ac->am_administrator && data->confidential_attrs) {
1777 for (i = 0; data->confidential_attrs[i]; i++) {
1778 ldb_parse_tree_attr_replace(down_tree,
1779 data->confidential_attrs[i],
1780 "kludgeACLredactedattribute");
1781 }
1782 }
1783
1784 ret = ldb_build_search_req_ex(&down_req,
1785 ldb, ac,
1786 req->op.search.base,
1787 req->op.search.scope,
1788 down_tree,
1789 req->op.search.attrs,
1790 req->controls,
1791 ac, acl_search_callback,
1792 req);
1793 LDB_REQ_SET_LOCATION(down_req);
1794 if (ret != LDB_SUCCESS) {
1795 return ret;
1796 }
1797 /* perform the search */
1798 return ldb_next_request(module, down_req);
1799 }
1800
1801 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1802 {
1803 struct ldb_context *ldb = ldb_module_get_ctx(module);
1804 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1805
1806 /* allow everybody to read the sequence number */
1807 if (strcmp(req->op.extended.oid,
1808 LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1809 return ldb_next_request(module, req);
1810 }
1811
1812 if (dsdb_module_am_system(module) ||
1813 dsdb_module_am_administrator(module) || as_system) {
1814 return ldb_next_request(module, req);
1815 } else {
1816 ldb_asprintf_errstring(ldb,
1817 "acl_extended: "
1818 "attempted database modify not permitted. "
1819 "User %s is not SYSTEM or an administrator",
1820 acl_user_name(req, module));
1821 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1822 }
1823 }
1824
1825 static const struct ldb_module_ops ldb_acl_module_ops = {
1826 .name = "acl",
1827 .search = acl_search,
1828 .add = acl_add,
1829 .modify = acl_modify,
1830 .del = acl_delete,
1831 .rename = acl_rename,
1832 .extended = acl_extended,
1833 .init_context = acl_module_init
1834 };
1835
1836 int ldb_acl_module_init(const char *version)
1837 {
1838 LDB_MODULE_CHECK_VERSION(version);
1839 return ldb_register_module(&ldb_acl_module_ops);
1840 }