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s4:dsdb/acl: only give administrators access to attributes marked as confidential...
[Samba/gebeck_regimport.git] / source4 / dsdb / samdb / ldb_modules / acl.c
blob1a41ee231f2f22b3eaadfbe6df8088b4c8fd7f4e
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_perform;
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;
83 TALLOC_CTX *mem_ctx;
84 static const char *attrs[] = { "passwordAttribute", NULL };
85 struct ldb_result *res;
86 struct ldb_message *msg;
87 struct ldb_message_element *password_attributes;
88
89 ldb = ldb_module_get_ctx(module);
90
91 ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
92 if (ret != LDB_SUCCESS) {
93 ldb_debug(ldb, LDB_DEBUG_ERROR,
94 "acl_module_init: Unable to register control with rootdse!\n");
95 return ldb_operr(ldb);
96 }
97
98 data = talloc_zero(module, struct acl_private);
99 if (data == NULL) {
100 return ldb_oom(ldb);
101 }
102
103 data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
104 NULL, "acl", "perform", false);
105 ldb_module_set_private(module, data);
106
107 mem_ctx = talloc_new(module);
108 if (!mem_ctx) {
109 return ldb_oom(ldb);
110 }
111
112 ret = dsdb_module_search_dn(module, mem_ctx, &res,
113 ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
114 attrs,
115 DSDB_FLAG_NEXT_MODULE, NULL);
116 if (ret != LDB_SUCCESS) {
117 goto done;
118 }
119 if (res->count == 0) {
120 goto done;
121 }
122
123 if (res->count > 1) {
124 talloc_free(mem_ctx);
125 return LDB_ERR_CONSTRAINT_VIOLATION;
126 }
127
128 msg = res->msgs[0];
129
130 password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
131 if (!password_attributes) {
132 goto done;
133 }
134 data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
135 if (!data->password_attrs) {
136 talloc_free(mem_ctx);
137 return ldb_oom(ldb);
138 }
139 for (i=0; i < password_attributes->num_values; i++) {
140 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
141 talloc_steal(data->password_attrs, password_attributes->values[i].data);
142 }
143 data->password_attrs[i] = NULL;
144
145 done:
146 talloc_free(mem_ctx);
147 return ldb_next_init(module);
148 }
149
150 static int acl_allowedAttributes(struct ldb_module *module,
151 const struct dsdb_schema *schema,
152 struct ldb_message *sd_msg,
153 struct ldb_message *msg,
154 struct acl_context *ac)
155 {
156 struct ldb_message_element *oc_el;
157 struct ldb_context *ldb = ldb_module_get_ctx(module);
158 TALLOC_CTX *mem_ctx;
159 const char **attr_list;
160 int i, ret;
161
162 /* If we don't have a schema yet, we can't do anything... */
163 if (schema == NULL) {
164 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
165 return LDB_ERR_OPERATIONS_ERROR;
166 }
167
168 /* Must remove any existing attribute */
169 if (ac->allowedAttributes) {
170 ldb_msg_remove_attr(msg, "allowedAttributes");
171 }
172
173 mem_ctx = talloc_new(msg);
174 if (!mem_ctx) {
175 return ldb_oom(ldb);
176 }
177
178 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
179 attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
180 if (!attr_list) {
181 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
182 talloc_free(mem_ctx);
183 return LDB_ERR_OPERATIONS_ERROR;
184 }
185 if (ac->allowedAttributes) {
186 for (i=0; attr_list && attr_list[i]; i++) {
187 ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
188 }
189 }
190 if (ac->allowedAttributesEffective) {
191 struct security_descriptor *sd;
192 struct dom_sid *sid = NULL;
193 struct ldb_control *as_system = ldb_request_get_control(ac->req,
194 LDB_CONTROL_AS_SYSTEM_OID);
195
196 if (as_system != NULL) {
197 as_system->critical = 0;
198 }
199
200 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
201 if (ac->am_system || as_system) {
202 for (i=0; attr_list && attr_list[i]; i++) {
203 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
204 }
205 return LDB_SUCCESS;
206 }
207
208 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
209
210 if (ret != LDB_SUCCESS) {
211 return ret;
212 }
213
214 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
215 for (i=0; attr_list && attr_list[i]; i++) {
216 const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
217 attr_list[i]);
218 if (!attr) {
219 return ldb_operr(ldb);
220 }
221 /* remove constructed attributes */
222 if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
223 || attr->systemOnly
224 || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
225 continue;
226 }
227 ret = acl_check_access_on_attribute(module,
228 msg,
229 sd,
230 sid,
231 SEC_ADS_WRITE_PROP,
232 attr);
233 if (ret == LDB_SUCCESS) {
234 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
235 }
236 }
237 }
238 return LDB_SUCCESS;
239 }
240
241 static int acl_childClasses(struct ldb_module *module,
242 const struct dsdb_schema *schema,
243 struct ldb_message *sd_msg,
244 struct ldb_message *msg,
245 const char *attrName)
246 {
247 struct ldb_message_element *oc_el;
248 struct ldb_message_element *allowedClasses;
249 const struct dsdb_class *sclass;
250 unsigned int i, j;
251 int ret;
252
253 /* If we don't have a schema yet, we can't do anything... */
254 if (schema == NULL) {
255 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
256 return LDB_ERR_OPERATIONS_ERROR;
257 }
258
259 /* Must remove any existing attribute, or else confusion reins */
260 ldb_msg_remove_attr(msg, attrName);
261 ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
262 if (ret != LDB_SUCCESS) {
263 return ret;
264 }
265
266 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
267
268 for (i=0; oc_el && i < oc_el->num_values; i++) {
269 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
270 if (!sclass) {
271 /* We don't know this class? what is going on? */
272 continue;
273 }
274
275 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
276 ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
277 }
278 }
279 if (allowedClasses->num_values > 1) {
280 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
281 for (i=1 ; i < allowedClasses->num_values; i++) {
282 struct ldb_val *val1 = &allowedClasses->values[i-1];
283 struct ldb_val *val2 = &allowedClasses->values[i];
284 if (data_blob_cmp(val1, val2) == 0) {
285 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
286 allowedClasses->num_values--;
287 i--;
288 }
289 }
290 }
291
292 return LDB_SUCCESS;
293 }
294
295 static int acl_check_access_on_class(struct ldb_module *module,
296 const struct dsdb_schema *schema,
297 TALLOC_CTX *mem_ctx,
298 struct security_descriptor *sd,
299 struct security_token *token,
300 struct dom_sid *rp_sid,
301 uint32_t access_mask,
302 const char *class_name)
303 {
304 int ret;
305 NTSTATUS status;
306 uint32_t access_granted;
307 struct object_tree *root = NULL;
308 struct object_tree *new_node = NULL;
309 const struct GUID *guid;
310
311 if (class_name != NULL) {
312 guid = class_schemaid_guid_by_lDAPDisplayName(schema, class_name);
313 if (!guid) {
314 DEBUG(10, ("acl_search: cannot find class %s\n",
315 class_name));
316 goto fail;
317 }
318 if (!insert_in_object_tree(mem_ctx,
319 guid, access_mask,
320 &root, &new_node)) {
321 DEBUG(10, ("acl_search: cannot add to object tree guid\n"));
322 goto fail;
323 }
324 }
325
326 status = sec_access_check_ds(sd, token,
327 access_mask,
328 &access_granted,
329 root,
330 rp_sid);
331 if (!NT_STATUS_IS_OK(status)) {
332 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
333 } else {
334 ret = LDB_SUCCESS;
335 }
336 return ret;
337 fail:
338 return ldb_operr(ldb_module_get_ctx(module));
339 }
340
341 static int acl_childClassesEffective(struct ldb_module *module,
342 const struct dsdb_schema *schema,
343 struct ldb_message *sd_msg,
344 struct ldb_message *msg,
345 struct acl_context *ac)
346 {
347 struct ldb_message_element *oc_el;
348 struct ldb_message_element *allowedClasses = NULL;
349 const struct dsdb_class *sclass;
350 struct security_descriptor *sd;
351 struct ldb_control *as_system = ldb_request_get_control(ac->req,
352 LDB_CONTROL_AS_SYSTEM_OID);
353 struct dom_sid *sid = NULL;
354 unsigned int i, j;
355 int ret;
356
357 if (as_system != NULL) {
358 as_system->critical = 0;
359 }
360
361 if (ac->am_system || as_system) {
362 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
363 }
364
365 /* If we don't have a schema yet, we can't do anything... */
366 if (schema == NULL) {
367 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
368 return LDB_ERR_OPERATIONS_ERROR;
369 }
370
371 /* Must remove any existing attribute, or else confusion reins */
372 ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
373
374 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
375 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
376 if (ret != LDB_SUCCESS) {
377 return ret;
378 }
379
380 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
381 for (i=0; oc_el && i < oc_el->num_values; i++) {
382 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
383 if (!sclass) {
384 /* We don't know this class? what is going on? */
385 continue;
386 }
387
388 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
389 ret = acl_check_access_on_class(module,
390 schema,
391 msg,
392 sd,
393 acl_user_token(module),
394 sid,
395 SEC_ADS_CREATE_CHILD,
396 sclass->possibleInferiors[j]);
397 if (ret == LDB_SUCCESS) {
398 ldb_msg_add_string(msg, "allowedChildClassesEffective",
399 sclass->possibleInferiors[j]);
400 }
401 }
402 }
403 allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
404 if (!allowedClasses) {
405 return LDB_SUCCESS;
406 }
407
408 if (allowedClasses->num_values > 1) {
409 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
410 for (i=1 ; i < allowedClasses->num_values; i++) {
411 struct ldb_val *val1 = &allowedClasses->values[i-1];
412 struct ldb_val *val2 = &allowedClasses->values[i];
413 if (data_blob_cmp(val1, val2) == 0) {
414 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
415 allowedClasses->num_values--;
416 i--;
417 }
418 }
419 }
420 return LDB_SUCCESS;
421 }
422
423 static int acl_sDRightsEffective(struct ldb_module *module,
424 struct ldb_message *sd_msg,
425 struct ldb_message *msg,
426 struct acl_context *ac)
427 {
428 struct ldb_message_element *rightsEffective;
429 int ret;
430 struct security_descriptor *sd;
431 struct ldb_control *as_system = ldb_request_get_control(ac->req,
432 LDB_CONTROL_AS_SYSTEM_OID);
433 struct dom_sid *sid = NULL;
434 uint32_t flags = 0;
435
436 if (as_system != NULL) {
437 as_system->critical = 0;
438 }
439
440 /* Must remove any existing attribute, or else confusion reins */
441 ldb_msg_remove_attr(msg, "sDRightsEffective");
442 ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
443 if (ret != LDB_SUCCESS) {
444 return ret;
445 }
446 if (ac->am_system || as_system) {
447 flags = SECINFO_OWNER | SECINFO_GROUP | SECINFO_SACL | SECINFO_DACL;
448 }
449 else {
450 /* Get the security descriptor from the message */
451 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
452 if (ret != LDB_SUCCESS) {
453 return ret;
454 }
455 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
456 ret = acl_check_access_on_attribute(module,
457 msg,
458 sd,
459 sid,
460 SEC_STD_WRITE_OWNER,
461 NULL);
462 if (ret == LDB_SUCCESS) {
463 flags |= SECINFO_OWNER | SECINFO_GROUP;
464 }
465 ret = acl_check_access_on_attribute(module,
466 msg,
467 sd,
468 sid,
469 SEC_STD_WRITE_DAC,
470 NULL);
471 if (ret == LDB_SUCCESS) {
472 flags |= SECINFO_DACL;
473 }
474 ret = acl_check_access_on_attribute(module,
475 msg,
476 sd,
477 sid,
478 SEC_FLAG_SYSTEM_SECURITY,
479 NULL);
480 if (ret == LDB_SUCCESS) {
481 flags |= SECINFO_SACL;
482 }
483 }
484 return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
485 "sDRightsEffective", flags);
486 }
487
488 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
489 struct ldb_context *ldb,
490 const char *spn_value,
491 uint32_t userAccountControl,
492 const char *samAccountName,
493 const char *dnsHostName,
494 const char *netbios_name,
495 const char *ntds_guid)
496 {
497 int ret;
498 krb5_context krb_ctx;
499 krb5_error_code kerr;
500 krb5_principal principal;
501 char *instanceName;
502 char *serviceType;
503 char *serviceName;
504 const char *forest_name = samdb_forest_name(ldb, mem_ctx);
505 const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
506 struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
507 struct loadparm_context);
508 bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
509 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
510
511 if (strcasecmp_m(spn_value, samAccountName) == 0) {
512 /* MacOS X sets this value, and setting an SPN of your
513 * own samAccountName is both pointless and safe */
514 return LDB_SUCCESS;
515 }
516
517 kerr = smb_krb5_init_context_basic(mem_ctx,
518 lp_ctx,
519 &krb_ctx);
520 if (kerr != 0) {
521 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
522 "Could not initialize kerberos context.");
523 }
524
525 ret = krb5_parse_name(krb_ctx, spn_value, &principal);
526 if (ret) {
527 krb5_free_context(krb_ctx);
528 return LDB_ERR_CONSTRAINT_VIOLATION;
529 }
530
531 if (principal->name.name_string.len < 2) {
532 goto fail;
533 }
534
535 instanceName = principal->name.name_string.val[1];
536 serviceType = principal->name.name_string.val[0];
537 if (principal->name.name_string.len == 3) {
538 serviceName = principal->name.name_string.val[2];
539 } else {
540 serviceName = NULL;
541 }
542
543 if (serviceName) {
544 if (!is_dc) {
545 goto fail;
546 }
547 if (strcasecmp(serviceType, "ldap") == 0) {
548 if (strcasecmp(serviceName, netbios_name) != 0 &&
549 strcasecmp(serviceName, forest_name) != 0) {
550 goto fail;
551 }
552
553 } else if (strcasecmp(serviceType, "gc") == 0) {
554 if (strcasecmp(serviceName, forest_name) != 0) {
555 goto fail;
556 }
557 } else {
558 if (strcasecmp(serviceName, base_domain) != 0 &&
559 strcasecmp(serviceName, netbios_name) != 0) {
560 goto fail;
561 }
562 }
563 }
564 /* instanceName can be samAccountName without $ or dnsHostName
565 * or "ntds_guid._msdcs.forest_domain for DC objects */
566 if (strlen(instanceName) == (strlen(samAccountName) - 1)
567 && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
568 goto success;
569 } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
570 goto success;
571 } else if (is_dc) {
572 const char *guid_str;
573 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
574 ntds_guid,
575 forest_name);
576 if (strcasecmp(instanceName, guid_str) == 0) {
577 goto success;
578 }
579 }
580
581 fail:
582 krb5_free_principal(krb_ctx, principal);
583 krb5_free_context(krb_ctx);
584 return LDB_ERR_CONSTRAINT_VIOLATION;
585
586 success:
587 krb5_free_principal(krb_ctx, principal);
588 krb5_free_context(krb_ctx);
589 return LDB_SUCCESS;
590 }
591
592 static int acl_check_spn(TALLOC_CTX *mem_ctx,
593 struct ldb_module *module,
594 struct ldb_request *req,
595 struct security_descriptor *sd,
596 struct dom_sid *sid,
597 const struct GUID *oc_guid,
598 const struct dsdb_attribute *attr)
599 {
600 int ret;
601 unsigned int i;
602 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
603 struct ldb_context *ldb = ldb_module_get_ctx(module);
604 struct ldb_result *acl_res;
605 struct ldb_result *netbios_res;
606 struct ldb_message_element *el;
607 struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
608 uint32_t userAccountControl;
609 const char *samAccountName;
610 const char *dnsHostName;
611 const char *netbios_name;
612 struct GUID ntds;
613 char *ntds_guid = NULL;
614
615 static const char *acl_attrs[] = {
616 "samAccountName",
617 "dnsHostName",
618 "userAccountControl",
619 NULL
620 };
621 static const char *netbios_attrs[] = {
622 "nETBIOSName",
623 NULL
624 };
625
626 /* if we have wp, we can do whatever we like */
627 if (acl_check_access_on_attribute(module,
628 tmp_ctx,
629 sd,
630 sid,
631 SEC_ADS_WRITE_PROP,
632 attr) == LDB_SUCCESS) {
633 talloc_free(tmp_ctx);
634 return LDB_SUCCESS;
635 }
636
637 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
638 GUID_DRS_VALIDATE_SPN,
639 SEC_ADS_SELF_WRITE,
640 sid);
641
642 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
643 dsdb_acl_debug(sd, acl_user_token(module),
644 req->op.mod.message->dn,
645 true,
646 10);
647 talloc_free(tmp_ctx);
648 return ret;
649 }
650
651 ret = dsdb_module_search_dn(module, tmp_ctx,
652 &acl_res, req->op.mod.message->dn,
653 acl_attrs,
654 DSDB_FLAG_NEXT_MODULE |
655 DSDB_SEARCH_SHOW_DELETED, req);
656 if (ret != LDB_SUCCESS) {
657 talloc_free(tmp_ctx);
658 return ret;
659 }
660
661 userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
662 dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
663 samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
664
665 ret = dsdb_module_search(module, tmp_ctx,
666 &netbios_res, partitions_dn,
667 LDB_SCOPE_ONELEVEL,
668 netbios_attrs,
669 DSDB_FLAG_NEXT_MODULE,
670 req,
671 "(ncName=%s)",
672 ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
673
674 netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
675
676 el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
677 if (!el) {
678 talloc_free(tmp_ctx);
679 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
680 "Error finding element for servicePrincipalName.");
681 }
682
683 /* NTDSDSA objectGuid of object we are checking SPN for */
684 if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
685 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
686 req->op.mod.message->dn, &ntds, req);
687 if (ret != LDB_SUCCESS) {
688 ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
689 ldb_dn_get_linearized(req->op.mod.message->dn),
690 ldb_strerror(ret));
691 talloc_free(tmp_ctx);
692 return LDB_ERR_OPERATIONS_ERROR;
693 }
694 ntds_guid = GUID_string(tmp_ctx, &ntds);
695 }
696
697 for (i=0; i < el->num_values; i++) {
698 ret = acl_validate_spn_value(tmp_ctx,
699 ldb,
700 (char *)el->values[i].data,
701 userAccountControl,
702 samAccountName,
703 dnsHostName,
704 netbios_name,
705 ntds_guid);
706 if (ret != LDB_SUCCESS) {
707 talloc_free(tmp_ctx);
708 return ret;
709 }
710 }
711 talloc_free(tmp_ctx);
712 return LDB_SUCCESS;
713 }
714
715 static int acl_add(struct ldb_module *module, struct ldb_request *req)
716 {
717 int ret;
718 struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
719 struct ldb_context *ldb;
720 const struct dsdb_schema *schema;
721 struct ldb_message_element *oc_el;
722 const struct GUID *guid;
723 struct ldb_dn *nc_root;
724 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
725
726 if (as_system != NULL) {
727 as_system->critical = 0;
728 }
729
730 if (dsdb_module_am_system(module) || as_system) {
731 return ldb_next_request(module, req);
732 }
733 if (ldb_dn_is_special(req->op.add.message->dn)) {
734 return ldb_next_request(module, req);
735 }
736
737 ldb = ldb_module_get_ctx(module);
738
739 /* Creating an NC. There is probably something we should do here,
740 * but we will establish that later */
741
742 ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
743 if (ret != LDB_SUCCESS) {
744 return ret;
745 }
746 if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
747 talloc_free(nc_root);
748 return ldb_next_request(module, req);
749 }
750 talloc_free(nc_root);
751
752 schema = dsdb_get_schema(ldb, req);
753 if (!schema) {
754 return ldb_operr(ldb);
755 }
756
757 oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
758 if (!oc_el || oc_el->num_values == 0) {
759 ldb_asprintf_errstring(ldb_module_get_ctx(module),
760 "acl: unable to find objectClass on %s\n",
761 ldb_dn_get_linearized(req->op.add.message->dn));
762 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
763 }
764
765 guid = class_schemaid_guid_by_lDAPDisplayName(schema,
766 (char *)oc_el->values[oc_el->num_values-1].data);
767 ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
768 if (ret != LDB_SUCCESS) {
769 return ret;
770 }
771 return ldb_next_request(module, req);
772 }
773
774 /* ckecks if modifications are allowed on "Member" attribute */
775 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
776 struct ldb_module *module,
777 struct ldb_request *req,
778 struct security_descriptor *sd,
779 struct dom_sid *sid,
780 const struct GUID *oc_guid,
781 const struct dsdb_attribute *attr)
782 {
783 int ret;
784 unsigned int i;
785 struct ldb_context *ldb = ldb_module_get_ctx(module);
786 struct ldb_dn *user_dn;
787 struct ldb_message_element *member_el;
788 /* if we have wp, we can do whatever we like */
789 if (acl_check_access_on_attribute(module,
790 mem_ctx,
791 sd,
792 sid,
793 SEC_ADS_WRITE_PROP,
794 attr) == LDB_SUCCESS) {
795 return LDB_SUCCESS;
796 }
797 /* if we are adding/deleting ourselves, check for self membership */
798 ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
799 &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
800 &user_dn);
801 if (ret != LDB_SUCCESS) {
802 return ret;
803 }
804 member_el = ldb_msg_find_element(req->op.mod.message, "member");
805 if (!member_el) {
806 return ldb_operr(ldb);
807 }
808 /* user can only remove oneself */
809 if (member_el->num_values == 0) {
810 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
811 }
812 for (i = 0; i < member_el->num_values; i++) {
813 if (strcasecmp((const char *)member_el->values[i].data,
814 ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
815 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
816 }
817 }
818 ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
819 GUID_DRS_SELF_MEMBERSHIP,
820 SEC_ADS_SELF_WRITE,
821 sid);
822 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
823 dsdb_acl_debug(sd, acl_user_token(module),
824 req->op.mod.message->dn,
825 true,
826 10);
827 }
828 return ret;
829 }
830
831 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
832 struct ldb_module *module,
833 struct ldb_request *req,
834 struct security_descriptor *sd,
835 struct dom_sid *sid,
836 const struct GUID *oc_guid,
837 bool userPassword)
838 {
839 int ret = LDB_SUCCESS;
840 unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
841 struct ldb_message_element *el;
842 struct ldb_message *msg;
843 const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
844 "unicodePwd", "dBCSPwd", NULL }, **l;
845 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
846
847 msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
848 if (msg == NULL) {
849 return ldb_module_oom(module);
850 }
851 for (l = passwordAttrs; *l != NULL; l++) {
852 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
853 continue;
854 }
855
856 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
857 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
858 ++del_attr_cnt;
859 }
860 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
861 ++add_attr_cnt;
862 }
863 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
864 ++rep_attr_cnt;
865 }
866 ldb_msg_remove_element(msg, el);
867 }
868 }
869
870 /* single deletes will be handled by the "password_hash" LDB module
871 * later in the stack, so we let it though here */
872 if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
873 talloc_free(tmp_ctx);
874 return LDB_SUCCESS;
875 }
876
877 if (ldb_request_get_control(req,
878 DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
879 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
880 * have a user password change and not a set as the message
881 * looks like. In it's value blob it contains the NT and/or LM
882 * hash of the old password specified by the user.
883 * This control is used by the SAMR and "kpasswd" password
884 * change mechanisms. */
885 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
886 GUID_DRS_USER_CHANGE_PASSWORD,
887 SEC_ADS_CONTROL_ACCESS,
888 sid);
889 }
890 else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
891 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
892 GUID_DRS_FORCE_CHANGE_PASSWORD,
893 SEC_ADS_CONTROL_ACCESS,
894 sid);
895 }
896 else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
897 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
898 GUID_DRS_USER_CHANGE_PASSWORD,
899 SEC_ADS_CONTROL_ACCESS,
900 sid);
901 /* Very strange, but we get constraint violation in this case */
902 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
903 ret = LDB_ERR_CONSTRAINT_VIOLATION;
904 }
905 }
906 if (ret != LDB_SUCCESS) {
907 dsdb_acl_debug(sd, acl_user_token(module),
908 req->op.mod.message->dn,
909 true,
910 10);
911 }
912 talloc_free(tmp_ctx);
913 return ret;
914 }
915
916 static const struct GUID *get_oc_guid_from_message(const struct dsdb_schema *schema,
917 struct ldb_message *msg)
918 {
919 struct ldb_message_element *oc_el;
920 const struct dsdb_class *object_class;
921
922 oc_el = ldb_msg_find_element(msg, "objectClass");
923 if (!oc_el) {
924 return NULL;
925 }
926
927 object_class = dsdb_get_last_structural_class(schema, oc_el);
928 if (object_class == NULL) {
929 return NULL;
930 }
931
932 return &object_class->schemaIDGUID;
933 }
934
935
936 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
937 {
938 int ret;
939 struct ldb_context *ldb = ldb_module_get_ctx(module);
940 const struct dsdb_schema *schema;
941 unsigned int i;
942 const struct GUID *guid;
943 uint32_t access_granted;
944 struct object_tree *root = NULL;
945 struct object_tree *new_node = NULL;
946 NTSTATUS status;
947 struct ldb_result *acl_res;
948 struct security_descriptor *sd;
949 struct dom_sid *sid = NULL;
950 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
951 bool userPassword = dsdb_user_password_support(module, req, req);
952 TALLOC_CTX *tmp_ctx = talloc_new(req);
953 static const char *acl_attrs[] = {
954 "nTSecurityDescriptor",
955 "objectClass",
956 "objectSid",
957 NULL
958 };
959
960 if (as_system != NULL) {
961 as_system->critical = 0;
962 }
963
964 /* Don't print this debug statement if elements[0].name is going to be NULL */
965 if(req->op.mod.message->num_elements > 0)
966 {
967 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
968 }
969 if (dsdb_module_am_system(module) || as_system) {
970 return ldb_next_request(module, req);
971 }
972 if (ldb_dn_is_special(req->op.mod.message->dn)) {
973 return ldb_next_request(module, req);
974 }
975 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
976 acl_attrs,
977 DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
978 req);
979
980 if (ret != LDB_SUCCESS) {
981 goto fail;
982 }
983
984 schema = dsdb_get_schema(ldb, tmp_ctx);
985 if (!schema) {
986 ret = LDB_ERR_OPERATIONS_ERROR;
987 goto fail;
988 }
989
990 ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
991 if (ret != LDB_SUCCESS) {
992 talloc_free(tmp_ctx);
993 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
994 "acl_modify: Error retrieving security descriptor.");
995 }
996 /* Theoretically we pass the check if the object has no sd */
997 if (!sd) {
998 goto success;
999 }
1000
1001 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1002 if (!guid) {
1003 talloc_free(tmp_ctx);
1004 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1005 "acl_modify: Error retrieving object class GUID.");
1006 }
1007 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1008 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1009 &root, &new_node)) {
1010 talloc_free(tmp_ctx);
1011 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1012 "acl_modify: Error adding new node in object tree.");
1013 }
1014 for (i=0; i < req->op.mod.message->num_elements; i++){
1015 const struct dsdb_attribute *attr;
1016 attr = dsdb_attribute_by_lDAPDisplayName(schema,
1017 req->op.mod.message->elements[i].name);
1018
1019 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
1020 status = sec_access_check_ds(sd, acl_user_token(module),
1021 SEC_STD_WRITE_DAC,
1022 &access_granted,
1023 NULL,
1024 sid);
1025
1026 if (!NT_STATUS_IS_OK(status)) {
1027 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1028 "Object %s has no write dacl access\n",
1029 ldb_dn_get_linearized(req->op.mod.message->dn));
1030 dsdb_acl_debug(sd,
1031 acl_user_token(module),
1032 req->op.mod.message->dn,
1033 true,
1034 10);
1035 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1036 goto fail;
1037 }
1038 }
1039 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
1040 ret = acl_check_self_membership(tmp_ctx,
1041 module,
1042 req,
1043 sd,
1044 sid,
1045 guid,
1046 attr);
1047 if (ret != LDB_SUCCESS) {
1048 goto fail;
1049 }
1050 }
1051 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
1052 /* this one is not affected by any rights, we should let it through
1053 so that passwords_hash returns the correct error */
1054 continue;
1055 }
1056 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
1057 (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
1058 ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
1059 ret = acl_check_password_rights(tmp_ctx,
1060 module,
1061 req,
1062 sd,
1063 sid,
1064 guid,
1065 userPassword);
1066 if (ret != LDB_SUCCESS) {
1067 goto fail;
1068 }
1069 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
1070 ret = acl_check_spn(tmp_ctx,
1071 module,
1072 req,
1073 sd,
1074 sid,
1075 guid,
1076 attr);
1077 if (ret != LDB_SUCCESS) {
1078 goto fail;
1079 }
1080 } else {
1081
1082 /* This basic attribute existence check with the right errorcode
1083 * is needed since this module is the first one which requests
1084 * schema attribute information.
1085 * The complete attribute checking is done in the
1086 * "objectclass_attrs" module behind this one.
1087 */
1088 if (!attr) {
1089 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1090 req->op.mod.message->elements[i].name,
1091 ldb_dn_get_linearized(req->op.mod.message->dn));
1092 ret = LDB_ERR_NO_SUCH_ATTRIBUTE;
1093 goto fail;
1094 }
1095 if (!insert_in_object_tree(tmp_ctx,
1096 &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1097 &new_node, &new_node)) {
1098 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1099 "acl_modify: cannot add to object tree securityGUID\n");
1100 ret = LDB_ERR_OPERATIONS_ERROR;
1101 goto fail;
1102 }
1103
1104 if (!insert_in_object_tree(tmp_ctx,
1105 &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1106 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1107 "acl_modify: cannot add to object tree attributeGUID\n");
1108 ret = LDB_ERR_OPERATIONS_ERROR;
1109 goto fail;
1110 }
1111 }
1112 }
1113
1114 if (root->num_of_children > 0) {
1115 status = sec_access_check_ds(sd, acl_user_token(module),
1116 SEC_ADS_WRITE_PROP,
1117 &access_granted,
1118 root,
1119 sid);
1120
1121 if (!NT_STATUS_IS_OK(status)) {
1122 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1123 "Object %s has no write property access\n",
1124 ldb_dn_get_linearized(req->op.mod.message->dn));
1125 dsdb_acl_debug(sd,
1126 acl_user_token(module),
1127 req->op.mod.message->dn,
1128 true,
1129 10);
1130 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1131 goto fail;
1132 }
1133 }
1134
1135 success:
1136 talloc_free(tmp_ctx);
1137 return ldb_next_request(module, req);
1138 fail:
1139 talloc_free(tmp_ctx);
1140 return ret;
1141 }
1142
1143 /* similar to the modify for the time being.
1144 * We need to consider the special delete tree case, though - TODO */
1145 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1146 {
1147 int ret;
1148 struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1149 struct ldb_context *ldb;
1150 struct ldb_dn *nc_root;
1151 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1152
1153 if (as_system != NULL) {
1154 as_system->critical = 0;
1155 }
1156
1157 DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1158 if (dsdb_module_am_system(module) || as_system) {
1159 return ldb_next_request(module, req);
1160 }
1161 if (ldb_dn_is_special(req->op.del.dn)) {
1162 return ldb_next_request(module, req);
1163 }
1164
1165 ldb = ldb_module_get_ctx(module);
1166
1167 /* Make sure we aren't deleting a NC */
1168
1169 ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1170 if (ret != LDB_SUCCESS) {
1171 return ret;
1172 }
1173 if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1174 talloc_free(nc_root);
1175 DEBUG(10,("acl:deleting a NC\n"));
1176 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1177 return ldb_module_done(req, NULL, NULL,
1178 LDB_ERR_UNWILLING_TO_PERFORM);
1179 }
1180 talloc_free(nc_root);
1181
1182 /* First check if we have delete object right */
1183 ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1184 SEC_STD_DELETE, NULL, req);
1185 if (ret == LDB_SUCCESS) {
1186 return ldb_next_request(module, req);
1187 }
1188
1189 /* Nope, we don't have delete object. Lets check if we have delete
1190 * child on the parent */
1191 ret = dsdb_module_check_access_on_dn(module, req, parent,
1192 SEC_ADS_DELETE_CHILD, NULL, req);
1193 if (ret != LDB_SUCCESS) {
1194 return ret;
1195 }
1196
1197 return ldb_next_request(module, req);
1198 }
1199
1200 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1201 {
1202 int ret;
1203 struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1204 struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1205 const struct dsdb_schema *schema;
1206 struct ldb_context *ldb;
1207 struct security_descriptor *sd = NULL;
1208 struct dom_sid *sid = NULL;
1209 struct ldb_result *acl_res;
1210 const struct GUID *guid;
1211 struct ldb_dn *nc_root;
1212 struct object_tree *root = NULL;
1213 struct object_tree *new_node = NULL;
1214 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1215 TALLOC_CTX *tmp_ctx = talloc_new(req);
1216 NTSTATUS status;
1217 uint32_t access_granted;
1218 const char *rdn_name;
1219 static const char *acl_attrs[] = {
1220 "nTSecurityDescriptor",
1221 "objectClass",
1222 "objectSid",
1223 NULL
1224 };
1225
1226 if (as_system != NULL) {
1227 as_system->critical = 0;
1228 }
1229
1230 DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1231 if (dsdb_module_am_system(module) || as_system) {
1232 return ldb_next_request(module, req);
1233 }
1234 if (ldb_dn_is_special(req->op.rename.olddn)) {
1235 return ldb_next_request(module, req);
1236 }
1237
1238 ldb = ldb_module_get_ctx(module);
1239
1240 /* Make sure we aren't renaming/moving a NC */
1241
1242 ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1243 if (ret != LDB_SUCCESS) {
1244 return ret;
1245 }
1246 if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1247 talloc_free(nc_root);
1248 DEBUG(10,("acl:renaming/moving a NC\n"));
1249 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1250 return ldb_module_done(req, NULL, NULL,
1251 LDB_ERR_UNWILLING_TO_PERFORM);
1252 }
1253 talloc_free(nc_root);
1254
1255 /* Look for the parent */
1256
1257 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1258 req->op.rename.olddn, acl_attrs,
1259 DSDB_FLAG_NEXT_MODULE |
1260 DSDB_SEARCH_SHOW_RECYCLED, req);
1261 /* we sould be able to find the parent */
1262 if (ret != LDB_SUCCESS) {
1263 DEBUG(10,("acl: failed to find object %s\n",
1264 ldb_dn_get_linearized(req->op.rename.olddn)));
1265 talloc_free(tmp_ctx);
1266 return ret;
1267 }
1268
1269 schema = dsdb_get_schema(ldb, acl_res);
1270 if (!schema) {
1271 talloc_free(tmp_ctx);
1272 return ldb_operr(ldb);
1273 }
1274
1275 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1276 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1277 &root, &new_node)) {
1278 talloc_free(tmp_ctx);
1279 return ldb_operr(ldb);
1280 };
1281
1282 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1283 "name");
1284 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1285 &new_node, &new_node)) {
1286 talloc_free(tmp_ctx);
1287 return ldb_operr(ldb);
1288 };
1289
1290 rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1291 if (rdn_name == NULL) {
1292 talloc_free(tmp_ctx);
1293 return ldb_operr(ldb);
1294 }
1295 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1296 rdn_name);
1297 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1298 &new_node, &new_node)) {
1299 talloc_free(tmp_ctx);
1300 return ldb_operr(ldb);
1301 };
1302
1303 ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1304
1305 if (ret != LDB_SUCCESS) {
1306 talloc_free(tmp_ctx);
1307 return ldb_operr(ldb);
1308 }
1309 /* Theoretically we pass the check if the object has no sd */
1310 if (!sd) {
1311 talloc_free(tmp_ctx);
1312 return LDB_SUCCESS;
1313 }
1314 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1315 status = sec_access_check_ds(sd, acl_user_token(module),
1316 SEC_ADS_WRITE_PROP,
1317 &access_granted,
1318 root,
1319 sid);
1320
1321 if (!NT_STATUS_IS_OK(status)) {
1322 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1323 "Object %s has no wp on name\n",
1324 ldb_dn_get_linearized(req->op.rename.olddn));
1325 dsdb_acl_debug(sd,
1326 acl_user_token(module),
1327 req->op.rename.olddn,
1328 true,
1329 10);
1330 talloc_free(tmp_ctx);
1331 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1332 }
1333
1334 if (ldb_dn_compare(oldparent, newparent) == 0) {
1335 /* regular rename, not move, nothing more to do */
1336 talloc_free(tmp_ctx);
1337 return ldb_next_request(module, req);
1338 }
1339
1340 /* new parent should have create child */
1341 root = NULL;
1342 new_node = NULL;
1343 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1344 if (!guid) {
1345 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1346 "acl:renamed object has no object class\n");
1347 talloc_free(tmp_ctx);
1348 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
1349 }
1350
1351 ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1352 if (ret != LDB_SUCCESS) {
1353 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1354 "acl:access_denied renaming %s",
1355 ldb_dn_get_linearized(req->op.rename.olddn));
1356 talloc_free(tmp_ctx);
1357 return ret;
1358 }
1359 /* do we have delete object on the object? */
1360
1361 status = sec_access_check_ds(sd, acl_user_token(module),
1362 SEC_STD_DELETE,
1363 &access_granted,
1364 NULL,
1365 sid);
1366
1367 if (NT_STATUS_IS_OK(status)) {
1368 talloc_free(tmp_ctx);
1369 return ldb_next_request(module, req);
1370 }
1371 /* what about delete child on the current parent */
1372 ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1373 if (ret != LDB_SUCCESS) {
1374 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1375 "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1376 talloc_free(tmp_ctx);
1377 return ldb_module_done(req, NULL, NULL, ret);
1378 }
1379
1380 talloc_free(tmp_ctx);
1381
1382 return ldb_next_request(module, req);
1383 }
1384
1385 static int acl_search_update_confidential_attrs(struct acl_context *ac,
1386 struct acl_private *data)
1387 {
1388 struct dsdb_attribute *a;
1389 uint32_t n = 0;
1390
1391 if ((ac->schema == data->cached_schema_ptr) &&
1392 (ac->schema->loaded_usn == data->cached_schema_loaded_usn) &&
1393 (ac->schema->metadata_usn == data->cached_schema_metadata_usn))
1394 {
1395 return LDB_SUCCESS;
1396 }
1397
1398 data->cached_schema_ptr = NULL;
1399 data->cached_schema_loaded_usn = 0;
1400 data->cached_schema_metadata_usn = 0;
1401 TALLOC_FREE(data->confidential_attrs);
1402
1403 if (ac->schema == NULL) {
1404 return LDB_SUCCESS;
1405 }
1406
1407 for (a = ac->schema->attributes; a; a = a->next) {
1408 const char **attrs = data->confidential_attrs;
1409
1410 if (!(a->searchFlags & SEARCH_FLAG_CONFIDENTIAL)) {
1411 continue;
1412 }
1413
1414 attrs = talloc_realloc(data, attrs, const char *, n + 2);
1415 if (attrs == NULL) {
1416 TALLOC_FREE(data->confidential_attrs);
1417 return ldb_module_oom(ac->module);
1418 }
1419
1420 attrs[n] = a->lDAPDisplayName;
1421 attrs[n+1] = NULL;
1422 n++;
1423
1424 data->confidential_attrs = attrs;
1425 }
1426
1427 data->cached_schema_ptr = ac->schema;
1428 data->cached_schema_loaded_usn = ac->schema->loaded_usn;
1429 data->cached_schema_metadata_usn = ac->schema->metadata_usn;
1430
1431 return LDB_SUCCESS;
1432 }
1433
1434 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1435 {
1436 struct acl_context *ac;
1437 struct acl_private *data;
1438 struct ldb_result *acl_res;
1439 static const char *acl_attrs[] = {
1440 "objectClass",
1441 "nTSecurityDescriptor",
1442 "objectSid",
1443 NULL
1444 };
1445 int ret;
1446 unsigned int i;
1447
1448 ac = talloc_get_type(req->context, struct acl_context);
1449 data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1450 if (!ares) {
1451 return ldb_module_done(ac->req, NULL, NULL,
1452 LDB_ERR_OPERATIONS_ERROR);
1453 }
1454 if (ares->error != LDB_SUCCESS) {
1455 return ldb_module_done(ac->req, ares->controls,
1456 ares->response, ares->error);
1457 }
1458
1459 switch (ares->type) {
1460 case LDB_REPLY_ENTRY:
1461 if (ac->constructed_attrs) {
1462 ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1463 acl_attrs,
1464 DSDB_FLAG_NEXT_MODULE |
1465 DSDB_SEARCH_SHOW_DELETED, req);
1466 if (ret != LDB_SUCCESS) {
1467 return ldb_module_done(ac->req, NULL, NULL, ret);
1468 }
1469 }
1470
1471 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1472 ret = acl_allowedAttributes(ac->module, ac->schema,
1473 acl_res->msgs[0],
1474 ares->message, ac);
1475 if (ret != LDB_SUCCESS) {
1476 return ldb_module_done(ac->req, NULL, NULL, ret);
1477 }
1478 }
1479
1480 if (ac->allowedChildClasses) {
1481 ret = acl_childClasses(ac->module, ac->schema,
1482 acl_res->msgs[0],
1483 ares->message,
1484 "allowedChildClasses");
1485 if (ret != LDB_SUCCESS) {
1486 return ldb_module_done(ac->req, NULL, NULL, ret);
1487 }
1488 }
1489
1490 if (ac->allowedChildClassesEffective) {
1491 ret = acl_childClassesEffective(ac->module, ac->schema,
1492 acl_res->msgs[0],
1493 ares->message, ac);
1494 if (ret != LDB_SUCCESS) {
1495 return ldb_module_done(ac->req, NULL, NULL, ret);
1496 }
1497 }
1498
1499 if (ac->sDRightsEffective) {
1500 ret = acl_sDRightsEffective(ac->module,
1501 acl_res->msgs[0],
1502 ares->message, ac);
1503 if (ret != LDB_SUCCESS) {
1504 return ldb_module_done(ac->req, NULL, NULL, ret);
1505 }
1506 }
1507
1508 if (data == NULL) {
1509 return ldb_module_send_entry(ac->req, ares->message,
1510 ares->controls);
1511 }
1512
1513 if (ac->am_system) {
1514 return ldb_module_send_entry(ac->req, ares->message,
1515 ares->controls);
1516 }
1517
1518 if (data->password_attrs != NULL) {
1519 for (i = 0; data->password_attrs[i]; i++) {
1520 if ((!ac->userPassword) &&
1521 (ldb_attr_cmp(data->password_attrs[i],
1522 "userPassword") == 0))
1523 {
1524 continue;
1525 }
1526
1527 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1528 }
1529 }
1530
1531 if (ac->am_administrator) {
1532 return ldb_module_send_entry(ac->req, ares->message,
1533 ares->controls);
1534 }
1535
1536 ret = acl_search_update_confidential_attrs(ac, data);
1537 if (ret != LDB_SUCCESS) {
1538 return ret;
1539 }
1540
1541 if (data->confidential_attrs != NULL) {
1542 for (i = 0; data->confidential_attrs[i]; i++) {
1543 ldb_msg_remove_attr(ares->message,
1544 data->confidential_attrs[i]);
1545 }
1546 }
1547
1548 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1549
1550 case LDB_REPLY_REFERRAL:
1551 return ldb_module_send_referral(ac->req, ares->referral);
1552
1553 case LDB_REPLY_DONE:
1554 return ldb_module_done(ac->req, ares->controls,
1555 ares->response, LDB_SUCCESS);
1556
1557 }
1558 return LDB_SUCCESS;
1559 }
1560
1561 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1562 {
1563 struct ldb_context *ldb;
1564 struct acl_context *ac;
1565 struct ldb_parse_tree *down_tree;
1566 struct ldb_request *down_req;
1567 struct acl_private *data;
1568 int ret;
1569 unsigned int i;
1570
1571 ldb = ldb_module_get_ctx(module);
1572
1573 ac = talloc_zero(req, struct acl_context);
1574 if (ac == NULL) {
1575 return ldb_oom(ldb);
1576 }
1577 data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1578
1579 ac->module = module;
1580 ac->req = req;
1581 ac->am_system = dsdb_module_am_system(module);
1582 ac->am_administrator = dsdb_module_am_administrator(module);
1583 ac->constructed_attrs = false;
1584 ac->modify_search = true;
1585 ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1586 ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1587 ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1588 ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1589 ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1590 ac->userPassword = dsdb_user_password_support(module, ac, req);
1591 ac->schema = dsdb_get_schema(ldb, ac);
1592
1593 ac->constructed_attrs |= ac->allowedAttributes;
1594 ac->constructed_attrs |= ac->allowedChildClasses;
1595 ac->constructed_attrs |= ac->allowedChildClassesEffective;
1596 ac->constructed_attrs |= ac->allowedAttributesEffective;
1597 ac->constructed_attrs |= ac->sDRightsEffective;
1598
1599 if (data == NULL) {
1600 ac->modify_search = false;
1601 }
1602 if (ac->am_system) {
1603 ac->modify_search = false;
1604 }
1605
1606 if (!ac->constructed_attrs && !ac->modify_search) {
1607 return ldb_next_request(module, req);
1608 }
1609
1610 ret = acl_search_update_confidential_attrs(ac, data);
1611 if (ret != LDB_SUCCESS) {
1612 return ret;
1613 }
1614
1615 down_tree = ldb_parse_tree_copy_shallow(ac, req->op.search.tree);
1616 if (down_tree == NULL) {
1617 return ldb_oom(ldb);
1618 }
1619
1620 if (!ac->am_system && data->password_attrs) {
1621 for (i = 0; data->password_attrs[i]; i++) {
1622 if ((!ac->userPassword) &&
1623 (ldb_attr_cmp(data->password_attrs[i],
1624 "userPassword") == 0))
1625 {
1626 continue;
1627 }
1628
1629 ldb_parse_tree_attr_replace(down_tree,
1630 data->password_attrs[i],
1631 "kludgeACLredactedattribute");
1632 }
1633 }
1634
1635 if (!ac->am_system && !ac->am_administrator && data->confidential_attrs) {
1636 for (i = 0; data->confidential_attrs[i]; i++) {
1637 ldb_parse_tree_attr_replace(down_tree,
1638 data->confidential_attrs[i],
1639 "kludgeACLredactedattribute");
1640 }
1641 }
1642
1643 ret = ldb_build_search_req_ex(&down_req,
1644 ldb, ac,
1645 req->op.search.base,
1646 req->op.search.scope,
1647 down_tree,
1648 req->op.search.attrs,
1649 req->controls,
1650 ac, acl_search_callback,
1651 req);
1652 LDB_REQ_SET_LOCATION(down_req);
1653 if (ret != LDB_SUCCESS) {
1654 return ret;
1655 }
1656 /* perform the search */
1657 return ldb_next_request(module, down_req);
1658 }
1659
1660 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1661 {
1662 struct ldb_context *ldb = ldb_module_get_ctx(module);
1663 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1664
1665 /* allow everybody to read the sequence number */
1666 if (strcmp(req->op.extended.oid,
1667 LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1668 return ldb_next_request(module, req);
1669 }
1670
1671 if (dsdb_module_am_system(module) ||
1672 dsdb_module_am_administrator(module) || as_system) {
1673 return ldb_next_request(module, req);
1674 } else {
1675 ldb_asprintf_errstring(ldb,
1676 "acl_extended: "
1677 "attempted database modify not permitted. "
1678 "User %s is not SYSTEM or an administrator",
1679 acl_user_name(req, module));
1680 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1681 }
1682 }
1683
1684 static const struct ldb_module_ops ldb_acl_module_ops = {
1685 .name = "acl",
1686 .search = acl_search,
1687 .add = acl_add,
1688 .modify = acl_modify,
1689 .del = acl_delete,
1690 .rename = acl_rename,
1691 .extended = acl_extended,
1692 .init_context = acl_module_init
1693 };
1694
1695 int ldb_acl_module_init(const char *version)
1696 {
1697 LDB_MODULE_CHECK_VERSION(version);
1698 return ldb_register_module(&ldb_acl_module_ops);
1699 }
reg import