4 Copyright (C) Simo Sorce 2006-2008
5 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2007
6 Copyright (C) Nadezhda Ivanova 2009
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.
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.
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/>.
25 * Component: DS Security descriptor module
28 * - Calculate the security descriptor of a newly created object
29 * - Perform sd recalculation on a move operation
30 * - Handle sd modification invariants
32 * Author: Nadezhda Ivanova
36 #include "ldb_module.h"
37 #include "dlinklist.h"
38 #include "dsdb/samdb/samdb.h"
39 #include "librpc/ndr/libndr.h"
40 #include "librpc/gen_ndr/ndr_security.h"
41 #include "libcli/security/security.h"
42 #include "auth/auth.h"
43 #include "param/param.h"
45 struct descriptor_data {
49 struct descriptor_context {
50 struct ldb_module *module;
51 struct ldb_request *req;
52 struct ldb_reply *search_res;
53 struct ldb_reply *search_oc_res;
54 struct ldb_val *parentsd_val;
55 struct ldb_val *sd_val;
56 int (*step_fn)(struct descriptor_context *);
59 static const struct dsdb_class * get_last_structural_class(const struct dsdb_schema *schema, struct ldb_message_element *element)
61 const struct dsdb_class *last_class = NULL;
63 for (i = 0; i < element->num_values; i++){
65 last_class = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &element->values[i]);
67 const struct dsdb_class *tmp_class = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &element->values[i]);
68 if (tmp_class->subClass_order > last_class->subClass_order)
69 last_class = tmp_class;
75 struct dom_sid *get_default_ag(TALLOC_CTX *mem_ctx,
77 struct security_token *token,
78 struct ldb_context *ldb)
80 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
81 struct ldb_dn *root_base_dn = ldb_get_root_basedn(ldb);
82 struct ldb_dn *schema_base_dn = ldb_get_schema_basedn(ldb);
83 struct ldb_dn *config_base_dn = ldb_get_config_basedn(ldb);
84 const struct dom_sid *domain_sid = samdb_domain_sid(ldb);
85 struct dom_sid *da_sid = dom_sid_add_rid(tmp_ctx, domain_sid, DOMAIN_RID_ADMINS);
86 struct dom_sid *ea_sid = dom_sid_add_rid(tmp_ctx, domain_sid, DOMAIN_RID_ENTERPRISE_ADMINS);
87 struct dom_sid *sa_sid = dom_sid_add_rid(tmp_ctx, domain_sid, DOMAIN_RID_SCHEMA_ADMINS);
88 struct dom_sid *dag_sid;
90 if (ldb_dn_compare_base(schema_base_dn, dn) == 0){
91 if (security_token_has_sid(token, sa_sid))
92 dag_sid = dom_sid_dup(mem_ctx, sa_sid);
93 else if (security_token_has_sid(token, ea_sid))
94 dag_sid = dom_sid_dup(mem_ctx, ea_sid);
95 else if (security_token_has_sid(token, da_sid))
96 dag_sid = dom_sid_dup(mem_ctx, da_sid);
100 else if (ldb_dn_compare_base(config_base_dn, dn) == 0){
101 if (security_token_has_sid(token, ea_sid))
102 dag_sid = dom_sid_dup(mem_ctx, ea_sid);
103 else if (security_token_has_sid(token, da_sid))
104 dag_sid = dom_sid_dup(mem_ctx, da_sid);
108 else if (ldb_dn_compare_base(root_base_dn, dn) == 0){
109 if (security_token_has_sid(token, da_sid))
110 dag_sid = dom_sid_dup(mem_ctx, da_sid);
111 else if (security_token_has_sid(token, ea_sid))
112 dag_sid = dom_sid_dup(mem_ctx, ea_sid);
119 talloc_free(tmp_ctx);
123 static struct security_descriptor *get_sd_unpacked(struct ldb_module *module, TALLOC_CTX *mem_ctx,
124 const struct dsdb_class *objectclass)
126 struct ldb_context *ldb = ldb_module_get_ctx(module);
127 struct security_descriptor *sd;
128 const struct dom_sid *domain_sid = samdb_domain_sid(ldb);
130 if (!objectclass->defaultSecurityDescriptor || !domain_sid) {
134 sd = sddl_decode(mem_ctx,
135 objectclass->defaultSecurityDescriptor,
140 static struct dom_sid *get_default_group(TALLOC_CTX *mem_ctx,
141 struct ldb_context *ldb,
144 int *domainFunctionality;
146 domainFunctionality = talloc_get_type(
147 ldb_get_opaque(ldb, "domainFunctionality"), int);
149 if (*domainFunctionality
150 && (*domainFunctionality >= DS_DOMAIN_FUNCTION_2008)) {
157 static DATA_BLOB *get_new_descriptor(struct ldb_module *module,
160 const struct dsdb_class *objectclass,
161 const struct ldb_val *parent,
162 struct ldb_val *object)
164 struct security_descriptor *user_descriptor = NULL, *parent_descriptor = NULL;
165 struct security_descriptor *new_sd;
166 DATA_BLOB *linear_sd;
167 enum ndr_err_code ndr_err;
168 struct ldb_context *ldb = ldb_module_get_ctx(module);
169 struct auth_session_info *session_info
170 = ldb_get_opaque(ldb, "sessionInfo");
171 const struct dom_sid *domain_sid = samdb_domain_sid(ldb);
173 struct dom_sid *default_owner;
174 struct dom_sid *default_group;
177 user_descriptor = talloc(mem_ctx, struct security_descriptor);
180 ndr_err = ndr_pull_struct_blob(object, user_descriptor, NULL,
182 (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
184 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)){
185 talloc_free(user_descriptor);
189 user_descriptor = get_sd_unpacked(module, mem_ctx, objectclass);
193 parent_descriptor = talloc(mem_ctx, struct security_descriptor);
194 if(!parent_descriptor)
196 ndr_err = ndr_pull_struct_blob(parent, parent_descriptor, NULL,
198 (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
200 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)){
201 talloc_free(parent_descriptor);
205 default_owner = get_default_ag(mem_ctx, dn,
206 session_info->security_token, ldb);
207 default_group = get_default_group(mem_ctx, ldb, default_owner);
208 new_sd = create_security_descriptor(mem_ctx, parent_descriptor, user_descriptor, true,
209 NULL, SEC_DACL_AUTO_INHERIT|SEC_SACL_AUTO_INHERIT,
210 session_info->security_token,
211 default_owner, default_group,
212 map_generic_rights_ds);
217 sddl_sd = sddl_encode(mem_ctx, new_sd, domain_sid);
218 DEBUG(10, ("Object %s created with desriptor %s\n\n", ldb_dn_get_linearized(dn), sddl_sd));
220 linear_sd = talloc(mem_ctx, DATA_BLOB);
225 ndr_err = ndr_push_struct_blob(linear_sd, mem_ctx,
226 lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
228 (ndr_push_flags_fn_t)ndr_push_security_descriptor);
229 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
236 static struct descriptor_context *descriptor_init_context(struct ldb_module *module,
237 struct ldb_request *req)
239 struct ldb_context *ldb;
240 struct descriptor_context *ac;
242 ldb = ldb_module_get_ctx(module);
244 ac = talloc_zero(req, struct descriptor_context);
246 ldb_set_errstring(ldb, "Out of Memory");
255 static int get_search_callback(struct ldb_request *req, struct ldb_reply *ares)
257 struct ldb_context *ldb;
258 struct descriptor_context *ac;
261 ac = talloc_get_type(req->context, struct descriptor_context);
262 ldb = ldb_module_get_ctx(ac->module);
265 return ldb_module_done(ac->req, NULL, NULL,
266 LDB_ERR_OPERATIONS_ERROR);
268 if (ares->error != LDB_SUCCESS &&
269 ares->error != LDB_ERR_NO_SUCH_OBJECT) {
270 return ldb_module_done(ac->req, ares->controls,
271 ares->response, ares->error);
274 ldb_reset_err_string(ldb);
276 switch (ares->type) {
277 case LDB_REPLY_ENTRY:
278 if (ac->search_res != NULL) {
279 ldb_set_errstring(ldb, "Too many results");
281 return ldb_module_done(ac->req, NULL, NULL,
282 LDB_ERR_OPERATIONS_ERROR);
285 ac->search_res = talloc_steal(ac, ares);
288 case LDB_REPLY_REFERRAL:
295 ret = ac->step_fn(ac);
296 if (ret != LDB_SUCCESS) {
297 return ldb_module_done(ac->req, NULL, NULL, ret);
305 static int get_search_oc_callback(struct ldb_request *req, struct ldb_reply *ares)
307 struct ldb_context *ldb;
308 struct descriptor_context *ac;
311 ac = talloc_get_type(req->context, struct descriptor_context);
312 ldb = ldb_module_get_ctx(ac->module);
315 return ldb_module_done(ac->req, NULL, NULL,
316 LDB_ERR_OPERATIONS_ERROR);
318 if (ares->error != LDB_SUCCESS &&
319 ares->error != LDB_ERR_NO_SUCH_OBJECT) {
320 return ldb_module_done(ac->req, ares->controls,
321 ares->response, ares->error);
324 ldb_reset_err_string(ldb);
326 switch (ares->type) {
327 case LDB_REPLY_ENTRY:
328 if (ac->search_oc_res != NULL) {
329 ldb_set_errstring(ldb, "Too many results");
331 return ldb_module_done(ac->req, NULL, NULL,
332 LDB_ERR_OPERATIONS_ERROR);
335 ac->search_oc_res = talloc_steal(ac, ares);
338 case LDB_REPLY_REFERRAL:
345 ret = ac->step_fn(ac);
346 if (ret != LDB_SUCCESS) {
347 return ldb_module_done(ac->req, NULL, NULL, ret);
356 static int descriptor_op_callback(struct ldb_request *req, struct ldb_reply *ares)
358 struct descriptor_context *ac;
360 ac = talloc_get_type(req->context, struct descriptor_context);
363 return ldb_module_done(ac->req, NULL, NULL,
364 LDB_ERR_OPERATIONS_ERROR);
366 if (ares->error != LDB_SUCCESS) {
367 return ldb_module_done(ac->req, ares->controls,
368 ares->response, ares->error);
371 if (ares->type != LDB_REPLY_DONE) {
373 return ldb_module_done(ac->req, NULL, NULL,
374 LDB_ERR_OPERATIONS_ERROR);
377 return ldb_module_done(ac->req, ares->controls,
378 ares->response, ares->error);
381 static int descriptor_do_mod(struct descriptor_context *ac)
383 struct ldb_context *ldb;
384 const struct dsdb_schema *schema;
385 struct ldb_request *mod_req;
386 struct ldb_message_element *objectclass_element, *tmp_element;
389 const struct dsdb_class *objectclass;
390 struct ldb_message *msg;
393 ldb = ldb_module_get_ctx(ac->module);
394 schema = dsdb_get_schema(ldb);
396 msg = ldb_msg_copy_shallow(ac, ac->req->op.mod.message);
397 objectclass_element = ldb_msg_find_element(ac->search_oc_res->message, "objectClass");
398 objectclass = get_last_structural_class(schema, objectclass_element);
401 ldb_asprintf_errstring(ldb, "No last structural objectclass found on %s",
402 ldb_dn_get_linearized(ac->search_oc_res->message->dn));
403 return LDB_ERR_OPERATIONS_ERROR;
406 sd = get_new_descriptor(ac->module, msg->dn, ac, objectclass,
407 ac->parentsd_val, ac->sd_val);
409 tmp_element = ldb_msg_find_element(msg, "ntSecurityDescriptor");
410 flags = tmp_element->flags;
411 ldb_msg_remove_attr(msg, "nTSecurityDescriptor");
415 ret = ldb_msg_add_steal_value(msg, "nTSecurityDescriptor", sd);
416 if (ret != LDB_SUCCESS) {
419 tmp_element = ldb_msg_find_element(msg, "ntSecurityDescriptor");
420 tmp_element->flags = flags;
422 ret = ldb_build_mod_req(&mod_req, ldb, ac,
425 ac, descriptor_op_callback,
427 if (ret != LDB_SUCCESS) {
430 return ldb_next_request(ac->module, mod_req);
433 static int descriptor_do_add(struct descriptor_context *ac)
435 struct ldb_context *ldb;
436 const struct dsdb_schema *schema;
437 struct ldb_request *add_req;
438 struct ldb_message_element *objectclass_element, *sd_element = NULL;
439 struct ldb_message *msg;
443 const struct dsdb_class *objectclass;
444 static const char *const attrs[] = { "objectClass", NULL };
445 struct ldb_request *search_req;
447 ldb = ldb_module_get_ctx(ac->module);
448 schema = dsdb_get_schema(ldb);
449 mem_ctx = talloc_new(ac);
450 if (mem_ctx == NULL) {
451 return LDB_ERR_OPERATIONS_ERROR;
454 switch (ac->req->operation) {
456 msg = ldb_msg_copy_shallow(ac, ac->req->op.add.message);
457 objectclass_element = ldb_msg_find_element(msg, "objectClass");
458 objectclass = get_last_structural_class(schema, objectclass_element);
461 ldb_asprintf_errstring(ldb, "No last structural objectclass found on %s", ldb_dn_get_linearized(msg->dn));
462 return LDB_ERR_OPERATIONS_ERROR;
466 msg = ldb_msg_copy_shallow(ac, ac->req->op.mod.message);
469 return LDB_ERR_OPERATIONS_ERROR;
473 /* get the security descriptor values*/
474 sd_element = ldb_msg_find_element(msg, "nTSecurityDescriptor");
476 ac->sd_val = talloc_memdup(ac, &sd_element->values[0], sizeof(struct ldb_val));
478 /* NC's have no parent */
479 if ((ldb_dn_compare(msg->dn, (ldb_get_schema_basedn(ldb))) == 0) ||
480 (ldb_dn_compare(msg->dn, (ldb_get_config_basedn(ldb))) == 0) ||
481 (ldb_dn_compare(msg->dn, (ldb_get_root_basedn(ldb))) == 0)) {
482 ac->parentsd_val = NULL;
483 } else if (ac->search_res != NULL) {
484 struct ldb_message_element *parent_element = ldb_msg_find_element(ac->search_res->message, "nTSecurityDescriptor");
485 if (parent_element) {
486 ac->parentsd_val = talloc_memdup(ac, &parent_element->values[0], sizeof(struct ldb_val));
490 if (ac->req->operation == LDB_ADD) {
491 /* get the parent descriptor and the one provided. If not provided, get the default.*/
492 /* convert to security descriptor and calculate */
493 sd = get_new_descriptor(ac->module, msg->dn, mem_ctx, objectclass,
494 ac->parentsd_val, ac->sd_val);
496 ldb_msg_remove_attr(msg, "nTSecurityDescriptor");
500 ret = ldb_msg_add_steal_value(msg, "nTSecurityDescriptor", sd);
501 if (ret != LDB_SUCCESS) {
506 talloc_free(mem_ctx);
507 ret = ldb_msg_sanity_check(ldb, msg);
509 if (ret != LDB_SUCCESS) {
510 ldb_asprintf_errstring(ldb, "No last structural objectclass found on %s",
511 ldb_dn_get_linearized(msg->dn));
515 ret = ldb_build_add_req(&add_req, ldb, ac,
518 ac, descriptor_op_callback,
520 if (ret != LDB_SUCCESS) {
523 return ldb_next_request(ac->module, add_req);
525 ret = ldb_build_search_req(&search_req, ldb,
526 ac, msg->dn, LDB_SCOPE_BASE,
527 "(objectClass=*)", attrs,
529 ac, get_search_oc_callback,
531 if (ret != LDB_SUCCESS) {
534 ac->step_fn = descriptor_do_mod;
535 return ldb_next_request(ac->module, search_req);
539 static int descriptor_change(struct ldb_module *module, struct ldb_request *req)
541 struct ldb_context *ldb;
542 struct ldb_request *search_req;
543 struct descriptor_context *ac;
544 struct ldb_dn *parent_dn, *dn;
545 struct ldb_message_element *sd_element;
547 static const char * const descr_attrs[] = { "nTSecurityDescriptor", NULL };
549 ldb = ldb_module_get_ctx(module);
551 switch (req->operation) {
553 dn = req->op.add.message->dn;
556 dn = req->op.mod.message->dn;
557 sd_element = ldb_msg_find_element(req->op.mod.message, "nTSecurityDescriptor");
559 return ldb_next_request(module, req);
563 return LDB_ERR_OPERATIONS_ERROR;
565 ldb_debug(ldb, LDB_DEBUG_TRACE,"descriptor_change: %s\n", ldb_dn_get_linearized(dn));
567 if (ldb_dn_is_special(dn)) {
568 return ldb_next_request(module, req);
571 ac = descriptor_init_context(module, req);
573 return LDB_ERR_OPERATIONS_ERROR;
576 /* If there isn't a parent, just go on to the add processing */
577 if (ldb_dn_get_comp_num(dn) == 1) {
578 return descriptor_do_add(ac);
581 /* get copy of parent DN */
582 parent_dn = ldb_dn_get_parent(ac, dn);
583 if (parent_dn == NULL) {
585 return LDB_ERR_OPERATIONS_ERROR;
588 ret = ldb_build_search_req(&search_req, ldb,
589 ac, parent_dn, LDB_SCOPE_BASE,
590 "(objectClass=*)", descr_attrs,
592 ac, get_search_callback,
594 if (ret != LDB_SUCCESS) {
597 talloc_steal(search_req, parent_dn);
599 ac->step_fn = descriptor_do_add;
601 return ldb_next_request(ac->module, search_req);
605 static int descriptor_rename(struct ldb_module *module, struct ldb_request *req)
607 struct ldb_context *ldb = ldb_module_get_ctx(module);
608 ldb_debug(ldb, LDB_DEBUG_TRACE,"descriptor_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn));
609 return ldb_next_request(module, req);
612 static int descriptor_init(struct ldb_module *module)
614 return ldb_next_init(module);
618 _PUBLIC_ const struct ldb_module_ops ldb_descriptor_module_ops = {
619 .name = "descriptor",
620 .add = descriptor_change,
621 .modify = descriptor_change,
622 .rename = descriptor_rename,
623 .init_context = descriptor_init