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dsdb-acl: add helper variable 'ldb' in acl_sDRightsEffective
[Samba/gebeck_regimport.git] / source4 / dsdb / samdb / ldb_modules / acl.c
blob24b65078030cb471fee8366d3ff14ef989561d73
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
195 /* If we don't have a schema yet, we can't do anything... */
196 if (schema == NULL) {
197 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
198 return LDB_ERR_OPERATIONS_ERROR;
199 }
200
201 /* Must remove any existing attribute */
202 if (ac->allowedAttributes) {
203 ldb_msg_remove_attr(msg, "allowedAttributes");
204 }
205
206 mem_ctx = talloc_new(msg);
207 if (!mem_ctx) {
208 return ldb_oom(ldb);
209 }
210
211 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
212 attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
213 if (!attr_list) {
214 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
215 talloc_free(mem_ctx);
216 return LDB_ERR_OPERATIONS_ERROR;
217 }
218 if (ac->allowedAttributes) {
219 for (i=0; attr_list && attr_list[i]; i++) {
220 ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
221 }
222 }
223 if (ac->allowedAttributesEffective) {
224 struct security_descriptor *sd;
225 struct dom_sid *sid = NULL;
226 struct ldb_control *as_system = ldb_request_get_control(ac->req,
227 LDB_CONTROL_AS_SYSTEM_OID);
228
229 if (as_system != NULL) {
230 as_system->critical = 0;
231 }
232
233 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
234 if (ac->am_system || as_system) {
235 for (i=0; attr_list && attr_list[i]; i++) {
236 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
237 }
238 return LDB_SUCCESS;
239 }
240
241 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
242
243 if (ret != LDB_SUCCESS) {
244 return ret;
245 }
246
247 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
248 for (i=0; attr_list && attr_list[i]; i++) {
249 const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
250 attr_list[i]);
251 if (!attr) {
252 return ldb_operr(ldb);
253 }
254 /* remove constructed attributes */
255 if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
256 || attr->systemOnly
257 || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
258 continue;
259 }
260 ret = acl_check_access_on_attribute(module,
261 msg,
262 sd,
263 sid,
264 SEC_ADS_WRITE_PROP,
265 attr);
266 if (ret == LDB_SUCCESS) {
267 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
268 }
269 }
270 }
271 return LDB_SUCCESS;
272 }
273
274 static int acl_childClasses(struct ldb_module *module,
275 const struct dsdb_schema *schema,
276 struct ldb_message *sd_msg,
277 struct ldb_message *msg,
278 const char *attrName)
279 {
280 struct ldb_message_element *oc_el;
281 struct ldb_message_element *allowedClasses;
282 const struct dsdb_class *sclass;
283 unsigned int i, j;
284 int ret;
285
286 /* If we don't have a schema yet, we can't do anything... */
287 if (schema == NULL) {
288 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
289 return LDB_ERR_OPERATIONS_ERROR;
290 }
291
292 /* Must remove any existing attribute, or else confusion reins */
293 ldb_msg_remove_attr(msg, attrName);
294 ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
295 if (ret != LDB_SUCCESS) {
296 return ret;
297 }
298
299 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
300
301 for (i=0; oc_el && i < oc_el->num_values; i++) {
302 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
303 if (!sclass) {
304 /* We don't know this class? what is going on? */
305 continue;
306 }
307
308 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
309 ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
310 }
311 }
312 if (allowedClasses->num_values > 1) {
313 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
314 for (i=1 ; i < allowedClasses->num_values; i++) {
315 struct ldb_val *val1 = &allowedClasses->values[i-1];
316 struct ldb_val *val2 = &allowedClasses->values[i];
317 if (data_blob_cmp(val1, val2) == 0) {
318 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
319 allowedClasses->num_values--;
320 i--;
321 }
322 }
323 }
324
325 return LDB_SUCCESS;
326 }
327
328 static int acl_check_access_on_class(struct ldb_module *module,
329 const struct dsdb_schema *schema,
330 TALLOC_CTX *mem_ctx,
331 struct security_descriptor *sd,
332 struct security_token *token,
333 struct dom_sid *rp_sid,
334 uint32_t access_mask,
335 const char *class_name)
336 {
337 int ret;
338 NTSTATUS status;
339 uint32_t access_granted;
340 struct object_tree *root = NULL;
341 struct object_tree *new_node = NULL;
342 const struct GUID *guid;
343
344 if (class_name != NULL) {
345 guid = class_schemaid_guid_by_lDAPDisplayName(schema, class_name);
346 if (!guid) {
347 DEBUG(10, ("acl_search: cannot find class %s\n",
348 class_name));
349 goto fail;
350 }
351 if (!insert_in_object_tree(mem_ctx,
352 guid, access_mask,
353 &root, &new_node)) {
354 DEBUG(10, ("acl_search: cannot add to object tree guid\n"));
355 goto fail;
356 }
357 }
358
359 status = sec_access_check_ds(sd, token,
360 access_mask,
361 &access_granted,
362 root,
363 rp_sid);
364 if (!NT_STATUS_IS_OK(status)) {
365 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
366 } else {
367 ret = LDB_SUCCESS;
368 }
369 return ret;
370 fail:
371 return ldb_operr(ldb_module_get_ctx(module));
372 }
373
374 static int acl_childClassesEffective(struct ldb_module *module,
375 const struct dsdb_schema *schema,
376 struct ldb_message *sd_msg,
377 struct ldb_message *msg,
378 struct acl_context *ac)
379 {
380 struct ldb_message_element *oc_el;
381 struct ldb_message_element *allowedClasses = NULL;
382 const struct dsdb_class *sclass;
383 struct security_descriptor *sd;
384 struct ldb_control *as_system = ldb_request_get_control(ac->req,
385 LDB_CONTROL_AS_SYSTEM_OID);
386 struct dom_sid *sid = NULL;
387 unsigned int i, j;
388 int ret;
389
390 if (as_system != NULL) {
391 as_system->critical = 0;
392 }
393
394 if (ac->am_system || as_system) {
395 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
396 }
397
398 /* If we don't have a schema yet, we can't do anything... */
399 if (schema == NULL) {
400 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
401 return LDB_ERR_OPERATIONS_ERROR;
402 }
403
404 /* Must remove any existing attribute, or else confusion reins */
405 ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
406
407 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
408 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
409 if (ret != LDB_SUCCESS) {
410 return ret;
411 }
412
413 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
414 for (i=0; oc_el && i < oc_el->num_values; i++) {
415 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
416 if (!sclass) {
417 /* We don't know this class? what is going on? */
418 continue;
419 }
420
421 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
422 ret = acl_check_access_on_class(module,
423 schema,
424 msg,
425 sd,
426 acl_user_token(module),
427 sid,
428 SEC_ADS_CREATE_CHILD,
429 sclass->possibleInferiors[j]);
430 if (ret == LDB_SUCCESS) {
431 ldb_msg_add_string(msg, "allowedChildClassesEffective",
432 sclass->possibleInferiors[j]);
433 }
434 }
435 }
436 allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
437 if (!allowedClasses) {
438 return LDB_SUCCESS;
439 }
440
441 if (allowedClasses->num_values > 1) {
442 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
443 for (i=1 ; i < allowedClasses->num_values; i++) {
444 struct ldb_val *val1 = &allowedClasses->values[i-1];
445 struct ldb_val *val2 = &allowedClasses->values[i];
446 if (data_blob_cmp(val1, val2) == 0) {
447 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
448 allowedClasses->num_values--;
449 i--;
450 }
451 }
452 }
453 return LDB_SUCCESS;
454 }
455
456 static int acl_sDRightsEffective(struct ldb_module *module,
457 struct ldb_message *sd_msg,
458 struct ldb_message *msg,
459 struct acl_context *ac)
460 {
461 struct ldb_context *ldb = ldb_module_get_ctx(module);
462 struct ldb_message_element *rightsEffective;
463 int ret;
464 struct security_descriptor *sd;
465 struct ldb_control *as_system = ldb_request_get_control(ac->req,
466 LDB_CONTROL_AS_SYSTEM_OID);
467 struct dom_sid *sid = NULL;
468 uint32_t flags = 0;
469
470 if (as_system != NULL) {
471 as_system->critical = 0;
472 }
473
474 /* Must remove any existing attribute, or else confusion reins */
475 ldb_msg_remove_attr(msg, "sDRightsEffective");
476 ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
477 if (ret != LDB_SUCCESS) {
478 return ret;
479 }
480 if (ac->am_system || as_system) {
481 flags = SECINFO_OWNER | SECINFO_GROUP | SECINFO_SACL | SECINFO_DACL;
482 }
483 else {
484 /* Get the security descriptor from the message */
485 ret = dsdb_get_sd_from_ldb_message(ldb, msg, sd_msg, &sd);
486 if (ret != LDB_SUCCESS) {
487 return ret;
488 }
489 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
490 ret = acl_check_access_on_attribute(module,
491 msg,
492 sd,
493 sid,
494 SEC_STD_WRITE_OWNER,
495 NULL);
496 if (ret == LDB_SUCCESS) {
497 flags |= SECINFO_OWNER | SECINFO_GROUP;
498 }
499 ret = acl_check_access_on_attribute(module,
500 msg,
501 sd,
502 sid,
503 SEC_STD_WRITE_DAC,
504 NULL);
505 if (ret == LDB_SUCCESS) {
506 flags |= SECINFO_DACL;
507 }
508 ret = acl_check_access_on_attribute(module,
509 msg,
510 sd,
511 sid,
512 SEC_FLAG_SYSTEM_SECURITY,
513 NULL);
514 if (ret == LDB_SUCCESS) {
515 flags |= SECINFO_SACL;
516 }
517 }
518 return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
519 "sDRightsEffective", flags);
520 }
521
522 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
523 struct ldb_context *ldb,
524 const char *spn_value,
525 uint32_t userAccountControl,
526 const char *samAccountName,
527 const char *dnsHostName,
528 const char *netbios_name,
529 const char *ntds_guid)
530 {
531 int ret;
532 krb5_context krb_ctx;
533 krb5_error_code kerr;
534 krb5_principal principal;
535 char *instanceName;
536 char *serviceType;
537 char *serviceName;
538 const char *forest_name = samdb_forest_name(ldb, mem_ctx);
539 const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
540 struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
541 struct loadparm_context);
542 bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
543 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
544
545 if (strcasecmp_m(spn_value, samAccountName) == 0) {
546 /* MacOS X sets this value, and setting an SPN of your
547 * own samAccountName is both pointless and safe */
548 return LDB_SUCCESS;
549 }
550
551 kerr = smb_krb5_init_context_basic(mem_ctx,
552 lp_ctx,
553 &krb_ctx);
554 if (kerr != 0) {
555 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
556 "Could not initialize kerberos context.");
557 }
558
559 ret = krb5_parse_name(krb_ctx, spn_value, &principal);
560 if (ret) {
561 krb5_free_context(krb_ctx);
562 return LDB_ERR_CONSTRAINT_VIOLATION;
563 }
564
565 if (principal->name.name_string.len < 2) {
566 goto fail;
567 }
568
569 instanceName = principal->name.name_string.val[1];
570 serviceType = principal->name.name_string.val[0];
571 if (principal->name.name_string.len == 3) {
572 serviceName = principal->name.name_string.val[2];
573 } else {
574 serviceName = NULL;
575 }
576
577 if (serviceName) {
578 if (!is_dc) {
579 goto fail;
580 }
581 if (strcasecmp(serviceType, "ldap") == 0) {
582 if (strcasecmp(serviceName, netbios_name) != 0 &&
583 strcasecmp(serviceName, forest_name) != 0) {
584 goto fail;
585 }
586
587 } else if (strcasecmp(serviceType, "gc") == 0) {
588 if (strcasecmp(serviceName, forest_name) != 0) {
589 goto fail;
590 }
591 } else {
592 if (strcasecmp(serviceName, base_domain) != 0 &&
593 strcasecmp(serviceName, netbios_name) != 0) {
594 goto fail;
595 }
596 }
597 }
598 /* instanceName can be samAccountName without $ or dnsHostName
599 * or "ntds_guid._msdcs.forest_domain for DC objects */
600 if (strlen(instanceName) == (strlen(samAccountName) - 1)
601 && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
602 goto success;
603 } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
604 goto success;
605 } else if (is_dc) {
606 const char *guid_str;
607 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
608 ntds_guid,
609 forest_name);
610 if (strcasecmp(instanceName, guid_str) == 0) {
611 goto success;
612 }
613 }
614
615 fail:
616 krb5_free_principal(krb_ctx, principal);
617 krb5_free_context(krb_ctx);
618 return LDB_ERR_CONSTRAINT_VIOLATION;
619
620 success:
621 krb5_free_principal(krb_ctx, principal);
622 krb5_free_context(krb_ctx);
623 return LDB_SUCCESS;
624 }
625
626 static int acl_check_spn(TALLOC_CTX *mem_ctx,
627 struct ldb_module *module,
628 struct ldb_request *req,
629 struct security_descriptor *sd,
630 struct dom_sid *sid,
631 const struct GUID *oc_guid,
632 const struct dsdb_attribute *attr)
633 {
634 int ret;
635 unsigned int i;
636 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
637 struct ldb_context *ldb = ldb_module_get_ctx(module);
638 struct ldb_result *acl_res;
639 struct ldb_result *netbios_res;
640 struct ldb_message_element *el;
641 struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
642 uint32_t userAccountControl;
643 const char *samAccountName;
644 const char *dnsHostName;
645 const char *netbios_name;
646 struct GUID ntds;
647 char *ntds_guid = NULL;
648
649 static const char *acl_attrs[] = {
650 "samAccountName",
651 "dnsHostName",
652 "userAccountControl",
653 NULL
654 };
655 static const char *netbios_attrs[] = {
656 "nETBIOSName",
657 NULL
658 };
659
660 /* if we have wp, we can do whatever we like */
661 if (acl_check_access_on_attribute(module,
662 tmp_ctx,
663 sd,
664 sid,
665 SEC_ADS_WRITE_PROP,
666 attr) == LDB_SUCCESS) {
667 talloc_free(tmp_ctx);
668 return LDB_SUCCESS;
669 }
670
671 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
672 GUID_DRS_VALIDATE_SPN,
673 SEC_ADS_SELF_WRITE,
674 sid);
675
676 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
677 dsdb_acl_debug(sd, acl_user_token(module),
678 req->op.mod.message->dn,
679 true,
680 10);
681 talloc_free(tmp_ctx);
682 return ret;
683 }
684
685 ret = dsdb_module_search_dn(module, tmp_ctx,
686 &acl_res, req->op.mod.message->dn,
687 acl_attrs,
688 DSDB_FLAG_NEXT_MODULE |
689 DSDB_FLAG_AS_SYSTEM |
690 DSDB_SEARCH_SHOW_RECYCLED,
691 req);
692 if (ret != LDB_SUCCESS) {
693 talloc_free(tmp_ctx);
694 return ret;
695 }
696
697 userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
698 dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
699 samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
700
701 ret = dsdb_module_search(module, tmp_ctx,
702 &netbios_res, partitions_dn,
703 LDB_SCOPE_ONELEVEL,
704 netbios_attrs,
705 DSDB_FLAG_NEXT_MODULE |
706 DSDB_FLAG_AS_SYSTEM,
707 req,
708 "(ncName=%s)",
709 ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
710
711 netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
712
713 el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
714 if (!el) {
715 talloc_free(tmp_ctx);
716 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
717 "Error finding element for servicePrincipalName.");
718 }
719
720 /* NTDSDSA objectGuid of object we are checking SPN for */
721 if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
722 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
723 req->op.mod.message->dn, &ntds, req);
724 if (ret != LDB_SUCCESS) {
725 ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
726 ldb_dn_get_linearized(req->op.mod.message->dn),
727 ldb_strerror(ret));
728 talloc_free(tmp_ctx);
729 return LDB_ERR_OPERATIONS_ERROR;
730 }
731 ntds_guid = GUID_string(tmp_ctx, &ntds);
732 }
733
734 for (i=0; i < el->num_values; i++) {
735 ret = acl_validate_spn_value(tmp_ctx,
736 ldb,
737 (char *)el->values[i].data,
738 userAccountControl,
739 samAccountName,
740 dnsHostName,
741 netbios_name,
742 ntds_guid);
743 if (ret != LDB_SUCCESS) {
744 talloc_free(tmp_ctx);
745 return ret;
746 }
747 }
748 talloc_free(tmp_ctx);
749 return LDB_SUCCESS;
750 }
751
752 static int acl_add(struct ldb_module *module, struct ldb_request *req)
753 {
754 int ret;
755 struct ldb_dn *parent;
756 struct ldb_context *ldb;
757 const struct dsdb_schema *schema;
758 struct ldb_message_element *oc_el;
759 const struct GUID *guid;
760 struct ldb_dn *nc_root;
761 struct ldb_control *as_system;
762
763 if (ldb_dn_is_special(req->op.add.message->dn)) {
764 return ldb_next_request(module, req);
765 }
766
767 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
768 if (as_system != NULL) {
769 as_system->critical = 0;
770 }
771
772 if (dsdb_module_am_system(module) || as_system) {
773 return ldb_next_request(module, req);
774 }
775
776 ldb = ldb_module_get_ctx(module);
777
778 parent = ldb_dn_get_parent(req, req->op.add.message->dn);
779 if (parent == NULL) {
780 return ldb_oom(ldb);
781 }
782
783 /* Creating an NC. There is probably something we should do here,
784 * but we will establish that later */
785
786 ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
787 if (ret != LDB_SUCCESS) {
788 return ret;
789 }
790 if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
791 talloc_free(nc_root);
792 return ldb_next_request(module, req);
793 }
794 talloc_free(nc_root);
795
796 schema = dsdb_get_schema(ldb, req);
797 if (!schema) {
798 return ldb_operr(ldb);
799 }
800
801 oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
802 if (!oc_el || oc_el->num_values == 0) {
803 ldb_asprintf_errstring(ldb_module_get_ctx(module),
804 "acl: unable to find objectClass on %s\n",
805 ldb_dn_get_linearized(req->op.add.message->dn));
806 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
807 }
808
809 guid = class_schemaid_guid_by_lDAPDisplayName(schema,
810 (char *)oc_el->values[oc_el->num_values-1].data);
811 ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
812 if (ret != LDB_SUCCESS) {
813 return ret;
814 }
815 return ldb_next_request(module, req);
816 }
817
818 /* ckecks if modifications are allowed on "Member" attribute */
819 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
820 struct ldb_module *module,
821 struct ldb_request *req,
822 struct security_descriptor *sd,
823 struct dom_sid *sid,
824 const struct GUID *oc_guid,
825 const struct dsdb_attribute *attr)
826 {
827 int ret;
828 unsigned int i;
829 struct ldb_context *ldb = ldb_module_get_ctx(module);
830 struct ldb_dn *user_dn;
831 struct ldb_message_element *member_el;
832 /* if we have wp, we can do whatever we like */
833 if (acl_check_access_on_attribute(module,
834 mem_ctx,
835 sd,
836 sid,
837 SEC_ADS_WRITE_PROP,
838 attr) == LDB_SUCCESS) {
839 return LDB_SUCCESS;
840 }
841 /* if we are adding/deleting ourselves, check for self membership */
842 ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
843 &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
844 &user_dn);
845 if (ret != LDB_SUCCESS) {
846 return ret;
847 }
848 member_el = ldb_msg_find_element(req->op.mod.message, "member");
849 if (!member_el) {
850 return ldb_operr(ldb);
851 }
852 /* user can only remove oneself */
853 if (member_el->num_values == 0) {
854 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
855 }
856 for (i = 0; i < member_el->num_values; i++) {
857 if (strcasecmp((const char *)member_el->values[i].data,
858 ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
859 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
860 }
861 }
862 ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
863 GUID_DRS_SELF_MEMBERSHIP,
864 SEC_ADS_SELF_WRITE,
865 sid);
866 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
867 dsdb_acl_debug(sd, acl_user_token(module),
868 req->op.mod.message->dn,
869 true,
870 10);
871 }
872 return ret;
873 }
874
875 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
876 struct ldb_module *module,
877 struct ldb_request *req,
878 struct security_descriptor *sd,
879 struct dom_sid *sid,
880 const struct GUID *oc_guid,
881 bool userPassword)
882 {
883 int ret = LDB_SUCCESS;
884 unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
885 struct ldb_message_element *el;
886 struct ldb_message *msg;
887 const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
888 "unicodePwd", "dBCSPwd", NULL }, **l;
889 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
890
891 msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
892 if (msg == NULL) {
893 return ldb_module_oom(module);
894 }
895 for (l = passwordAttrs; *l != NULL; l++) {
896 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
897 continue;
898 }
899
900 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
901 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
902 ++del_attr_cnt;
903 }
904 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
905 ++add_attr_cnt;
906 }
907 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
908 ++rep_attr_cnt;
909 }
910 ldb_msg_remove_element(msg, el);
911 }
912 }
913
914 /* single deletes will be handled by the "password_hash" LDB module
915 * later in the stack, so we let it though here */
916 if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
917 talloc_free(tmp_ctx);
918 return LDB_SUCCESS;
919 }
920
921 if (ldb_request_get_control(req,
922 DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
923 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
924 * have a user password change and not a set as the message
925 * looks like. In it's value blob it contains the NT and/or LM
926 * hash of the old password specified by the user.
927 * This control is used by the SAMR and "kpasswd" password
928 * change mechanisms. */
929 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
930 GUID_DRS_USER_CHANGE_PASSWORD,
931 SEC_ADS_CONTROL_ACCESS,
932 sid);
933 }
934 else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
935 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
936 GUID_DRS_FORCE_CHANGE_PASSWORD,
937 SEC_ADS_CONTROL_ACCESS,
938 sid);
939 }
940 else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
941 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
942 GUID_DRS_USER_CHANGE_PASSWORD,
943 SEC_ADS_CONTROL_ACCESS,
944 sid);
945 /* Very strange, but we get constraint violation in this case */
946 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
947 ret = LDB_ERR_CONSTRAINT_VIOLATION;
948 }
949 }
950 if (ret != LDB_SUCCESS) {
951 dsdb_acl_debug(sd, acl_user_token(module),
952 req->op.mod.message->dn,
953 true,
954 10);
955 }
956 talloc_free(tmp_ctx);
957 return ret;
958 }
959
960 static const struct GUID *get_oc_guid_from_message(const struct dsdb_schema *schema,
961 struct ldb_message *msg)
962 {
963 struct ldb_message_element *oc_el;
964 const struct dsdb_class *object_class;
965
966 oc_el = ldb_msg_find_element(msg, "objectClass");
967 if (!oc_el) {
968 return NULL;
969 }
970
971 object_class = dsdb_get_last_structural_class(schema, oc_el);
972 if (object_class == NULL) {
973 return NULL;
974 }
975
976 return &object_class->schemaIDGUID;
977 }
978
979
980 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
981 {
982 int ret;
983 struct ldb_context *ldb = ldb_module_get_ctx(module);
984 const struct dsdb_schema *schema;
985 unsigned int i;
986 const struct GUID *guid;
987 uint32_t access_granted;
988 NTSTATUS status;
989 struct ldb_result *acl_res;
990 struct security_descriptor *sd;
991 struct dom_sid *sid = NULL;
992 struct ldb_control *as_system;
993 bool userPassword;
994 TALLOC_CTX *tmp_ctx;
995 static const char *acl_attrs[] = {
996 "nTSecurityDescriptor",
997 "objectClass",
998 "objectSid",
999 NULL
1000 };
1001
1002 if (ldb_dn_is_special(req->op.mod.message->dn)) {
1003 return ldb_next_request(module, req);
1004 }
1005
1006 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1007 if (as_system != NULL) {
1008 as_system->critical = 0;
1009 }
1010
1011 /* Don't print this debug statement if elements[0].name is going to be NULL */
1012 if(req->op.mod.message->num_elements > 0)
1013 {
1014 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
1015 }
1016 if (dsdb_module_am_system(module) || as_system) {
1017 return ldb_next_request(module, req);
1018 }
1019
1020 tmp_ctx = talloc_new(req);
1021 if (tmp_ctx == NULL) {
1022 return ldb_oom(ldb);
1023 }
1024
1025 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
1026 acl_attrs,
1027 DSDB_FLAG_NEXT_MODULE |
1028 DSDB_FLAG_AS_SYSTEM |
1029 DSDB_SEARCH_SHOW_RECYCLED,
1030 req);
1031
1032 if (ret != LDB_SUCCESS) {
1033 goto fail;
1034 }
1035
1036 userPassword = dsdb_user_password_support(module, req, req);
1037
1038 schema = dsdb_get_schema(ldb, tmp_ctx);
1039 if (!schema) {
1040 talloc_free(tmp_ctx);
1041 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1042 "acl_modify: Error obtaining schema.");
1043 }
1044
1045 ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
1046 if (ret != LDB_SUCCESS) {
1047 talloc_free(tmp_ctx);
1048 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1049 "acl_modify: Error retrieving security descriptor.");
1050 }
1051 /* Theoretically we pass the check if the object has no sd */
1052 if (!sd) {
1053 goto success;
1054 }
1055
1056 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1057 if (!guid) {
1058 talloc_free(tmp_ctx);
1059 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1060 "acl_modify: Error retrieving object class GUID.");
1061 }
1062 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1063 for (i=0; i < req->op.mod.message->num_elements; i++){
1064 const struct dsdb_attribute *attr;
1065 attr = dsdb_attribute_by_lDAPDisplayName(schema,
1066 req->op.mod.message->elements[i].name);
1067
1068 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
1069 uint32_t sd_flags = dsdb_request_sd_flags(req, NULL);
1070 uint32_t access_mask = 0;
1071
1072 if (sd_flags & (SECINFO_OWNER|SECINFO_GROUP)) {
1073 access_mask |= SEC_STD_WRITE_OWNER;
1074 }
1075 if (sd_flags & SECINFO_DACL) {
1076 access_mask |= SEC_STD_WRITE_DAC;
1077 }
1078 if (sd_flags & SECINFO_SACL) {
1079 access_mask |= SEC_FLAG_SYSTEM_SECURITY;
1080 }
1081
1082 status = sec_access_check_ds(sd, acl_user_token(module),
1083 access_mask,
1084 &access_granted,
1085 NULL,
1086 sid);
1087
1088 if (!NT_STATUS_IS_OK(status)) {
1089 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1090 "Object %s has no write dacl access\n",
1091 ldb_dn_get_linearized(req->op.mod.message->dn));
1092 dsdb_acl_debug(sd,
1093 acl_user_token(module),
1094 req->op.mod.message->dn,
1095 true,
1096 10);
1097 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1098 goto fail;
1099 }
1100 }
1101 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
1102 ret = acl_check_self_membership(tmp_ctx,
1103 module,
1104 req,
1105 sd,
1106 sid,
1107 guid,
1108 attr);
1109 if (ret != LDB_SUCCESS) {
1110 goto fail;
1111 }
1112 }
1113 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
1114 /* this one is not affected by any rights, we should let it through
1115 so that passwords_hash returns the correct error */
1116 continue;
1117 }
1118 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
1119 (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
1120 ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
1121 ret = acl_check_password_rights(tmp_ctx,
1122 module,
1123 req,
1124 sd,
1125 sid,
1126 guid,
1127 userPassword);
1128 if (ret != LDB_SUCCESS) {
1129 goto fail;
1130 }
1131 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
1132 ret = acl_check_spn(tmp_ctx,
1133 module,
1134 req,
1135 sd,
1136 sid,
1137 guid,
1138 attr);
1139 if (ret != LDB_SUCCESS) {
1140 goto fail;
1141 }
1142 } else {
1143 struct object_tree *root = NULL;
1144 struct object_tree *new_node = NULL;
1145
1146 /* This basic attribute existence check with the right errorcode
1147 * is needed since this module is the first one which requests
1148 * schema attribute information.
1149 * The complete attribute checking is done in the
1150 * "objectclass_attrs" module behind this one.
1151 */
1152 if (!attr) {
1153 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1154 req->op.mod.message->elements[i].name,
1155 ldb_dn_get_linearized(req->op.mod.message->dn));
1156 ret = LDB_ERR_NO_SUCH_ATTRIBUTE;
1157 goto fail;
1158 }
1159
1160 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1161 &root, &new_node)) {
1162 talloc_free(tmp_ctx);
1163 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1164 "acl_modify: Error adding new node in object tree.");
1165 }
1166
1167 if (!insert_in_object_tree(tmp_ctx,
1168 &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1169 &new_node, &new_node)) {
1170 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1171 "acl_modify: cannot add to object tree securityGUID\n");
1172 ret = LDB_ERR_OPERATIONS_ERROR;
1173 goto fail;
1174 }
1175
1176 if (!insert_in_object_tree(tmp_ctx,
1177 &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1178 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1179 "acl_modify: cannot add to object tree attributeGUID\n");
1180 ret = LDB_ERR_OPERATIONS_ERROR;
1181 goto fail;
1182 }
1183
1184 status = sec_access_check_ds(sd, acl_user_token(module),
1185 SEC_ADS_WRITE_PROP,
1186 &access_granted,
1187 root,
1188 sid);
1189 if (!NT_STATUS_IS_OK(status)) {
1190 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1191 "Object %s has no write property access\n",
1192 ldb_dn_get_linearized(req->op.mod.message->dn));
1193 dsdb_acl_debug(sd,
1194 acl_user_token(module),
1195 req->op.mod.message->dn,
1196 true,
1197 10);
1198 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1199 goto fail;
1200 }
1201 }
1202 }
1203
1204 success:
1205 talloc_free(tmp_ctx);
1206 return ldb_next_request(module, req);
1207 fail:
1208 talloc_free(tmp_ctx);
1209 return ret;
1210 }
1211
1212 /* similar to the modify for the time being.
1213 * We need to consider the special delete tree case, though - TODO */
1214 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1215 {
1216 int ret;
1217 struct ldb_dn *parent;
1218 struct ldb_context *ldb;
1219 struct ldb_dn *nc_root;
1220 struct ldb_control *as_system;
1221
1222 if (ldb_dn_is_special(req->op.del.dn)) {
1223 return ldb_next_request(module, req);
1224 }
1225
1226 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1227 if (as_system != NULL) {
1228 as_system->critical = 0;
1229 }
1230
1231 if (dsdb_module_am_system(module) || as_system) {
1232 return ldb_next_request(module, req);
1233 }
1234
1235 DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1236
1237 ldb = ldb_module_get_ctx(module);
1238
1239 parent = ldb_dn_get_parent(req, req->op.del.dn);
1240 if (parent == NULL) {
1241 return ldb_oom(ldb);
1242 }
1243
1244 /* Make sure we aren't deleting a NC */
1245
1246 ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1247 if (ret != LDB_SUCCESS) {
1248 return ret;
1249 }
1250 if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1251 talloc_free(nc_root);
1252 DEBUG(10,("acl:deleting a NC\n"));
1253 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1254 return ldb_module_done(req, NULL, NULL,
1255 LDB_ERR_UNWILLING_TO_PERFORM);
1256 }
1257 talloc_free(nc_root);
1258
1259 if (ldb_request_get_control(req, LDB_CONTROL_TREE_DELETE_OID)) {
1260 ret = dsdb_module_check_access_on_dn(module, req,
1261 req->op.del.dn,
1262 SEC_ADS_DELETE_TREE, NULL,
1263 req);
1264 if (ret != LDB_SUCCESS) {
1265 return ret;
1266 }
1267
1268 return ldb_next_request(module, req);
1269 }
1270
1271 /* First check if we have delete object right */
1272 ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1273 SEC_STD_DELETE, NULL, req);
1274 if (ret == LDB_SUCCESS) {
1275 return ldb_next_request(module, req);
1276 }
1277
1278 /* Nope, we don't have delete object. Lets check if we have delete
1279 * child on the parent */
1280 ret = dsdb_module_check_access_on_dn(module, req, parent,
1281 SEC_ADS_DELETE_CHILD, NULL, req);
1282 if (ret != LDB_SUCCESS) {
1283 return ret;
1284 }
1285
1286 return ldb_next_request(module, req);
1287 }
1288
1289 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1290 {
1291 int ret;
1292 struct ldb_dn *oldparent;
1293 struct ldb_dn *newparent;
1294 const struct dsdb_schema *schema;
1295 struct ldb_context *ldb;
1296 struct security_descriptor *sd = NULL;
1297 struct dom_sid *sid = NULL;
1298 struct ldb_result *acl_res;
1299 const struct GUID *guid;
1300 struct ldb_dn *nc_root;
1301 struct object_tree *root = NULL;
1302 struct object_tree *new_node = NULL;
1303 struct ldb_control *as_system;
1304 TALLOC_CTX *tmp_ctx;
1305 NTSTATUS status;
1306 uint32_t access_granted;
1307 const char *rdn_name;
1308 static const char *acl_attrs[] = {
1309 "nTSecurityDescriptor",
1310 "objectClass",
1311 "objectSid",
1312 NULL
1313 };
1314
1315 if (ldb_dn_is_special(req->op.rename.olddn)) {
1316 return ldb_next_request(module, req);
1317 }
1318
1319 as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1320 if (as_system != NULL) {
1321 as_system->critical = 0;
1322 }
1323
1324 DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1325 if (dsdb_module_am_system(module) || as_system) {
1326 return ldb_next_request(module, req);
1327 }
1328
1329 ldb = ldb_module_get_ctx(module);
1330
1331 tmp_ctx = talloc_new(req);
1332 if (tmp_ctx == NULL) {
1333 return ldb_oom(ldb);
1334 }
1335
1336 oldparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.olddn);
1337 if (oldparent == NULL) {
1338 return ldb_oom(ldb);
1339 }
1340 newparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.newdn);
1341 if (newparent == NULL) {
1342 return ldb_oom(ldb);
1343 }
1344
1345 /* Make sure we aren't renaming/moving a NC */
1346
1347 ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1348 if (ret != LDB_SUCCESS) {
1349 return ret;
1350 }
1351 if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1352 talloc_free(nc_root);
1353 DEBUG(10,("acl:renaming/moving a NC\n"));
1354 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1355 return ldb_module_done(req, NULL, NULL,
1356 LDB_ERR_UNWILLING_TO_PERFORM);
1357 }
1358 talloc_free(nc_root);
1359
1360 /* Look for the parent */
1361
1362 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1363 req->op.rename.olddn, acl_attrs,
1364 DSDB_FLAG_NEXT_MODULE |
1365 DSDB_FLAG_AS_SYSTEM |
1366 DSDB_SEARCH_SHOW_RECYCLED, req);
1367 /* we sould be able to find the parent */
1368 if (ret != LDB_SUCCESS) {
1369 DEBUG(10,("acl: failed to find object %s\n",
1370 ldb_dn_get_linearized(req->op.rename.olddn)));
1371 talloc_free(tmp_ctx);
1372 return ret;
1373 }
1374
1375 schema = dsdb_get_schema(ldb, acl_res);
1376 if (!schema) {
1377 talloc_free(tmp_ctx);
1378 return ldb_operr(ldb);
1379 }
1380
1381 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1382 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1383 &root, &new_node)) {
1384 talloc_free(tmp_ctx);
1385 return ldb_operr(ldb);
1386 };
1387
1388 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1389 "name");
1390 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1391 &new_node, &new_node)) {
1392 talloc_free(tmp_ctx);
1393 return ldb_operr(ldb);
1394 };
1395
1396 rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1397 if (rdn_name == NULL) {
1398 talloc_free(tmp_ctx);
1399 return ldb_operr(ldb);
1400 }
1401 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1402 rdn_name);
1403 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1404 &new_node, &new_node)) {
1405 talloc_free(tmp_ctx);
1406 return ldb_operr(ldb);
1407 };
1408
1409 ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1410
1411 if (ret != LDB_SUCCESS) {
1412 talloc_free(tmp_ctx);
1413 return ldb_operr(ldb);
1414 }
1415 /* Theoretically we pass the check if the object has no sd */
1416 if (!sd) {
1417 talloc_free(tmp_ctx);
1418 return LDB_SUCCESS;
1419 }
1420 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1421 status = sec_access_check_ds(sd, acl_user_token(module),
1422 SEC_ADS_WRITE_PROP,
1423 &access_granted,
1424 root,
1425 sid);
1426
1427 if (!NT_STATUS_IS_OK(status)) {
1428 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1429 "Object %s has no wp on name\n",
1430 ldb_dn_get_linearized(req->op.rename.olddn));
1431 dsdb_acl_debug(sd,
1432 acl_user_token(module),
1433 req->op.rename.olddn,
1434 true,
1435 10);
1436 talloc_free(tmp_ctx);
1437 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1438 }
1439
1440 if (ldb_dn_compare(oldparent, newparent) == 0) {
1441 /* regular rename, not move, nothing more to do */
1442 talloc_free(tmp_ctx);
1443 return ldb_next_request(module, req);
1444 }
1445
1446 /* new parent should have create child */
1447 root = NULL;
1448 new_node = NULL;
1449 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1450 if (!guid) {
1451 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1452 "acl:renamed object has no object class\n");
1453 talloc_free(tmp_ctx);
1454 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
1455 }
1456
1457 ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1458 if (ret != LDB_SUCCESS) {
1459 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1460 "acl:access_denied renaming %s",
1461 ldb_dn_get_linearized(req->op.rename.olddn));
1462 talloc_free(tmp_ctx);
1463 return ret;
1464 }
1465 /* do we have delete object on the object? */
1466
1467 status = sec_access_check_ds(sd, acl_user_token(module),
1468 SEC_STD_DELETE,
1469 &access_granted,
1470 NULL,
1471 sid);
1472
1473 if (NT_STATUS_IS_OK(status)) {
1474 talloc_free(tmp_ctx);
1475 return ldb_next_request(module, req);
1476 }
1477 /* what about delete child on the current parent */
1478 ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1479 if (ret != LDB_SUCCESS) {
1480 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1481 "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1482 talloc_free(tmp_ctx);
1483 return ldb_module_done(req, NULL, NULL, ret);
1484 }
1485
1486 talloc_free(tmp_ctx);
1487
1488 return ldb_next_request(module, req);
1489 }
1490
1491 static int acl_search_update_confidential_attrs(struct acl_context *ac,
1492 struct acl_private *data)
1493 {
1494 struct dsdb_attribute *a;
1495 uint32_t n = 0;
1496
1497 if (data->acl_search) {
1498 /*
1499 * If acl:search is activated, the acl_read module
1500 * protects confidential attributes.
1501 */
1502 return LDB_SUCCESS;
1503 }
1504
1505 if ((ac->schema == data->cached_schema_ptr) &&
1506 (ac->schema->loaded_usn == data->cached_schema_loaded_usn) &&
1507 (ac->schema->metadata_usn == data->cached_schema_metadata_usn))
1508 {
1509 return LDB_SUCCESS;
1510 }
1511
1512 data->cached_schema_ptr = NULL;
1513 data->cached_schema_loaded_usn = 0;
1514 data->cached_schema_metadata_usn = 0;
1515 TALLOC_FREE(data->confidential_attrs);
1516
1517 if (ac->schema == NULL) {
1518 return LDB_SUCCESS;
1519 }
1520
1521 for (a = ac->schema->attributes; a; a = a->next) {
1522 const char **attrs = data->confidential_attrs;
1523
1524 if (!(a->searchFlags & SEARCH_FLAG_CONFIDENTIAL)) {
1525 continue;
1526 }
1527
1528 attrs = talloc_realloc(data, attrs, const char *, n + 2);
1529 if (attrs == NULL) {
1530 TALLOC_FREE(data->confidential_attrs);
1531 return ldb_module_oom(ac->module);
1532 }
1533
1534 attrs[n] = a->lDAPDisplayName;
1535 attrs[n+1] = NULL;
1536 n++;
1537
1538 data->confidential_attrs = attrs;
1539 }
1540
1541 data->cached_schema_ptr = ac->schema;
1542 data->cached_schema_loaded_usn = ac->schema->loaded_usn;
1543 data->cached_schema_metadata_usn = ac->schema->metadata_usn;
1544
1545 return LDB_SUCCESS;
1546 }
1547
1548 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1549 {
1550 struct acl_context *ac;
1551 struct acl_private *data;
1552 struct ldb_result *acl_res;
1553 static const char *acl_attrs[] = {
1554 "objectClass",
1555 "nTSecurityDescriptor",
1556 "objectSid",
1557 NULL
1558 };
1559 int ret;
1560 unsigned int i;
1561
1562 ac = talloc_get_type(req->context, struct acl_context);
1563 data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1564 if (!ares) {
1565 return ldb_module_done(ac->req, NULL, NULL,
1566 LDB_ERR_OPERATIONS_ERROR);
1567 }
1568 if (ares->error != LDB_SUCCESS) {
1569 return ldb_module_done(ac->req, ares->controls,
1570 ares->response, ares->error);
1571 }
1572
1573 switch (ares->type) {
1574 case LDB_REPLY_ENTRY:
1575 if (ac->constructed_attrs) {
1576 ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1577 acl_attrs,
1578 DSDB_FLAG_NEXT_MODULE |
1579 DSDB_FLAG_AS_SYSTEM |
1580 DSDB_SEARCH_SHOW_RECYCLED,
1581 req);
1582 if (ret != LDB_SUCCESS) {
1583 return ldb_module_done(ac->req, NULL, NULL, ret);
1584 }
1585 }
1586
1587 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1588 ret = acl_allowedAttributes(ac->module, ac->schema,
1589 acl_res->msgs[0],
1590 ares->message, ac);
1591 if (ret != LDB_SUCCESS) {
1592 return ldb_module_done(ac->req, NULL, NULL, ret);
1593 }
1594 }
1595
1596 if (ac->allowedChildClasses) {
1597 ret = acl_childClasses(ac->module, ac->schema,
1598 acl_res->msgs[0],
1599 ares->message,
1600 "allowedChildClasses");
1601 if (ret != LDB_SUCCESS) {
1602 return ldb_module_done(ac->req, NULL, NULL, ret);
1603 }
1604 }
1605
1606 if (ac->allowedChildClassesEffective) {
1607 ret = acl_childClassesEffective(ac->module, ac->schema,
1608 acl_res->msgs[0],
1609 ares->message, ac);
1610 if (ret != LDB_SUCCESS) {
1611 return ldb_module_done(ac->req, NULL, NULL, ret);
1612 }
1613 }
1614
1615 if (ac->sDRightsEffective) {
1616 ret = acl_sDRightsEffective(ac->module,
1617 acl_res->msgs[0],
1618 ares->message, ac);
1619 if (ret != LDB_SUCCESS) {
1620 return ldb_module_done(ac->req, NULL, NULL, ret);
1621 }
1622 }
1623
1624 if (data == NULL) {
1625 return ldb_module_send_entry(ac->req, ares->message,
1626 ares->controls);
1627 }
1628
1629 if (ac->am_system) {
1630 return ldb_module_send_entry(ac->req, ares->message,
1631 ares->controls);
1632 }
1633
1634 if (data->password_attrs != NULL) {
1635 for (i = 0; data->password_attrs[i]; i++) {
1636 if ((!ac->userPassword) &&
1637 (ldb_attr_cmp(data->password_attrs[i],
1638 "userPassword") == 0))
1639 {
1640 continue;
1641 }
1642
1643 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1644 }
1645 }
1646
1647 if (ac->am_administrator) {
1648 return ldb_module_send_entry(ac->req, ares->message,
1649 ares->controls);
1650 }
1651
1652 ret = acl_search_update_confidential_attrs(ac, data);
1653 if (ret != LDB_SUCCESS) {
1654 return ret;
1655 }
1656
1657 if (data->confidential_attrs != NULL) {
1658 for (i = 0; data->confidential_attrs[i]; i++) {
1659 ldb_msg_remove_attr(ares->message,
1660 data->confidential_attrs[i]);
1661 }
1662 }
1663
1664 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1665
1666 case LDB_REPLY_REFERRAL:
1667 return ldb_module_send_referral(ac->req, ares->referral);
1668
1669 case LDB_REPLY_DONE:
1670 return ldb_module_done(ac->req, ares->controls,
1671 ares->response, LDB_SUCCESS);
1672
1673 }
1674 return LDB_SUCCESS;
1675 }
1676
1677 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1678 {
1679 struct ldb_context *ldb;
1680 struct acl_context *ac;
1681 struct ldb_parse_tree *down_tree;
1682 struct ldb_request *down_req;
1683 struct acl_private *data;
1684 int ret;
1685 unsigned int i;
1686
1687 if (ldb_dn_is_special(req->op.search.base)) {
1688 return ldb_next_request(module, req);
1689 }
1690
1691 ldb = ldb_module_get_ctx(module);
1692
1693 ac = talloc_zero(req, struct acl_context);
1694 if (ac == NULL) {
1695 return ldb_oom(ldb);
1696 }
1697 data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1698
1699 ac->module = module;
1700 ac->req = req;
1701 ac->am_system = dsdb_module_am_system(module);
1702 ac->am_administrator = dsdb_module_am_administrator(module);
1703 ac->constructed_attrs = false;
1704 ac->modify_search = true;
1705 ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1706 ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1707 ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1708 ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1709 ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1710 ac->userPassword = true;
1711 ac->schema = dsdb_get_schema(ldb, ac);
1712
1713 ac->constructed_attrs |= ac->allowedAttributes;
1714 ac->constructed_attrs |= ac->allowedChildClasses;
1715 ac->constructed_attrs |= ac->allowedChildClassesEffective;
1716 ac->constructed_attrs |= ac->allowedAttributesEffective;
1717 ac->constructed_attrs |= ac->sDRightsEffective;
1718
1719 if (data == NULL) {
1720 ac->modify_search = false;
1721 }
1722 if (ac->am_system) {
1723 ac->modify_search = false;
1724 }
1725
1726 if (!ac->constructed_attrs && !ac->modify_search) {
1727 talloc_free(ac);
1728 return ldb_next_request(module, req);
1729 }
1730
1731 if (!ac->am_system) {
1732 ac->userPassword = dsdb_user_password_support(module, ac, req);
1733 }
1734
1735 ret = acl_search_update_confidential_attrs(ac, data);
1736 if (ret != LDB_SUCCESS) {
1737 return ret;
1738 }
1739
1740 down_tree = ldb_parse_tree_copy_shallow(ac, req->op.search.tree);
1741 if (down_tree == NULL) {
1742 return ldb_oom(ldb);
1743 }
1744
1745 if (!ac->am_system && data->password_attrs) {
1746 for (i = 0; data->password_attrs[i]; i++) {
1747 if ((!ac->userPassword) &&
1748 (ldb_attr_cmp(data->password_attrs[i],
1749 "userPassword") == 0))
1750 {
1751 continue;
1752 }
1753
1754 ldb_parse_tree_attr_replace(down_tree,
1755 data->password_attrs[i],
1756 "kludgeACLredactedattribute");
1757 }
1758 }
1759
1760 if (!ac->am_system && !ac->am_administrator && data->confidential_attrs) {
1761 for (i = 0; data->confidential_attrs[i]; i++) {
1762 ldb_parse_tree_attr_replace(down_tree,
1763 data->confidential_attrs[i],
1764 "kludgeACLredactedattribute");
1765 }
1766 }
1767
1768 ret = ldb_build_search_req_ex(&down_req,
1769 ldb, ac,
1770 req->op.search.base,
1771 req->op.search.scope,
1772 down_tree,
1773 req->op.search.attrs,
1774 req->controls,
1775 ac, acl_search_callback,
1776 req);
1777 LDB_REQ_SET_LOCATION(down_req);
1778 if (ret != LDB_SUCCESS) {
1779 return ret;
1780 }
1781 /* perform the search */
1782 return ldb_next_request(module, down_req);
1783 }
1784
1785 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1786 {
1787 struct ldb_context *ldb = ldb_module_get_ctx(module);
1788 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1789
1790 /* allow everybody to read the sequence number */
1791 if (strcmp(req->op.extended.oid,
1792 LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1793 return ldb_next_request(module, req);
1794 }
1795
1796 if (dsdb_module_am_system(module) ||
1797 dsdb_module_am_administrator(module) || as_system) {
1798 return ldb_next_request(module, req);
1799 } else {
1800 ldb_asprintf_errstring(ldb,
1801 "acl_extended: "
1802 "attempted database modify not permitted. "
1803 "User %s is not SYSTEM or an administrator",
1804 acl_user_name(req, module));
1805 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1806 }
1807 }
1808
1809 static const struct ldb_module_ops ldb_acl_module_ops = {
1810 .name = "acl",
1811 .search = acl_search,
1812 .add = acl_add,
1813 .modify = acl_modify,
1814 .del = acl_delete,
1815 .rename = acl_rename,
1816 .extended = acl_extended,
1817 .init_context = acl_module_init
1818 };
1819
1820 int ldb_acl_module_init(const char *version)
1821 {
1822 LDB_MODULE_CHECK_VERSION(version);
1823 return ldb_register_module(&ldb_acl_module_ops);
1824 }
reg import