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s4:dsdb/samdb/ldb_modules/schema.c - inline "get_oc_guid_from_message()" to its only...
[Samba/bjacke.git] / source4 / dsdb / samdb / ldb_modules / acl.c
blobbce878501a03c07b5c135d9dafca1e7b0973a9e5
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 "dsdb/samdb/ldb_modules/schema.h"
43 #include "lib/util/tsort.h"
44 #include "system/kerberos.h"
45 #include "auth/kerberos/kerberos.h"
46
47 struct extended_access_check_attribute {
48 const char *oa_name;
49 const uint32_t requires_rights;
50 };
51
52 struct acl_private {
53 bool acl_perform;
54 const char **password_attrs;
55 };
56
57 struct acl_context {
58 struct ldb_module *module;
59 struct ldb_request *req;
60 bool am_system;
61 bool allowedAttributes;
62 bool allowedAttributesEffective;
63 bool allowedChildClasses;
64 bool allowedChildClassesEffective;
65 bool sDRightsEffective;
66 bool userPassword;
67 const char * const *attrs;
68 struct dsdb_schema *schema;
69 };
70
71 static int acl_module_init(struct ldb_module *module)
72 {
73 struct ldb_context *ldb;
74 struct acl_private *data;
75 int ret;
76 unsigned int i;
77 TALLOC_CTX *mem_ctx;
78 static const char *attrs[] = { "passwordAttribute", NULL };
79 struct ldb_result *res;
80 struct ldb_message *msg;
81 struct ldb_message_element *password_attributes;
82
83 ldb = ldb_module_get_ctx(module);
84
85 ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
86 if (ret != LDB_SUCCESS) {
87 ldb_debug(ldb, LDB_DEBUG_ERROR,
88 "acl_module_init: Unable to register control with rootdse!\n");
89 return ldb_operr(ldb);
90 }
91
92 data = talloc(module, struct acl_private);
93 if (data == NULL) {
94 return ldb_oom(ldb);
95 }
96
97 data->password_attrs = NULL;
98 data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
99 NULL, "acl", "perform", false);
100 ldb_module_set_private(module, data);
101
102 mem_ctx = talloc_new(module);
103 if (!mem_ctx) {
104 return ldb_oom(ldb);
105 }
106
107 ret = dsdb_module_search_dn(module, mem_ctx, &res,
108 ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
109 attrs,
110 DSDB_FLAG_NEXT_MODULE, NULL);
111 if (ret != LDB_SUCCESS) {
112 goto done;
113 }
114 if (res->count == 0) {
115 goto done;
116 }
117
118 if (res->count > 1) {
119 talloc_free(mem_ctx);
120 return LDB_ERR_CONSTRAINT_VIOLATION;
121 }
122
123 msg = res->msgs[0];
124
125 password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
126 if (!password_attributes) {
127 goto done;
128 }
129 data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
130 if (!data->password_attrs) {
131 talloc_free(mem_ctx);
132 return ldb_oom(ldb);
133 }
134 for (i=0; i < password_attributes->num_values; i++) {
135 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
136 talloc_steal(data->password_attrs, password_attributes->values[i].data);
137 }
138 data->password_attrs[i] = NULL;
139
140 done:
141 talloc_free(mem_ctx);
142 return ldb_next_init(module);
143 }
144
145 static int acl_allowedAttributes(struct ldb_module *module,
146 const struct dsdb_schema *schema,
147 struct ldb_message *sd_msg,
148 struct ldb_message *msg,
149 struct acl_context *ac)
150 {
151 struct ldb_message_element *oc_el;
152 struct ldb_context *ldb = ldb_module_get_ctx(module);
153 TALLOC_CTX *mem_ctx;
154 const char **attr_list;
155 int i, ret;
156
157 /* If we don't have a schema yet, we can't do anything... */
158 if (schema == NULL) {
159 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
160 return LDB_ERR_OPERATIONS_ERROR;
161 }
162
163 /* Must remove any existing attribute */
164 if (ac->allowedAttributes) {
165 ldb_msg_remove_attr(msg, "allowedAttributes");
166 }
167
168 mem_ctx = talloc_new(msg);
169 if (!mem_ctx) {
170 return ldb_oom(ldb);
171 }
172
173 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
174 attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
175 if (!attr_list) {
176 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
177 talloc_free(mem_ctx);
178 return LDB_ERR_OPERATIONS_ERROR;
179 }
180 if (ac->allowedAttributes) {
181 for (i=0; attr_list && attr_list[i]; i++) {
182 ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
183 }
184 }
185 if (ac->allowedAttributesEffective) {
186 struct security_descriptor *sd;
187 struct dom_sid *sid = NULL;
188 struct ldb_control *as_system = ldb_request_get_control(ac->req,
189 LDB_CONTROL_AS_SYSTEM_OID);
190
191 if (as_system != NULL) {
192 as_system->critical = 0;
193 }
194
195 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
196 if (ac->am_system || as_system) {
197 for (i=0; attr_list && attr_list[i]; i++) {
198 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
199 }
200 return LDB_SUCCESS;
201 }
202
203 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
204
205 if (ret != LDB_SUCCESS) {
206 return ret;
207 }
208
209 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
210 for (i=0; attr_list && attr_list[i]; i++) {
211 const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
212 attr_list[i]);
213 if (!attr) {
214 return ldb_operr(ldb);
215 }
216 /* remove constructed attributes */
217 if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
218 || attr->systemOnly
219 || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
220 continue;
221 }
222 ret = acl_check_access_on_attribute(module,
223 msg,
224 sd,
225 sid,
226 SEC_ADS_WRITE_PROP,
227 attr);
228 if (ret == LDB_SUCCESS) {
229 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
230 }
231 }
232 }
233 return LDB_SUCCESS;
234 }
235
236 static int acl_childClasses(struct ldb_module *module,
237 const struct dsdb_schema *schema,
238 struct ldb_message *sd_msg,
239 struct ldb_message *msg,
240 const char *attrName)
241 {
242 struct ldb_message_element *oc_el;
243 struct ldb_message_element *allowedClasses;
244 const struct dsdb_class *sclass;
245 unsigned int i, j;
246 int ret;
247
248 /* If we don't have a schema yet, we can't do anything... */
249 if (schema == NULL) {
250 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
251 return LDB_ERR_OPERATIONS_ERROR;
252 }
253
254 /* Must remove any existing attribute, or else confusion reins */
255 ldb_msg_remove_attr(msg, attrName);
256 ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
257 if (ret != LDB_SUCCESS) {
258 return ret;
259 }
260
261 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
262
263 for (i=0; oc_el && i < oc_el->num_values; i++) {
264 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
265 if (!sclass) {
266 /* We don't know this class? what is going on? */
267 continue;
268 }
269
270 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
271 ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
272 }
273 }
274 if (allowedClasses->num_values > 1) {
275 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
276 for (i=1 ; i < allowedClasses->num_values; i++) {
277 struct ldb_val *val1 = &allowedClasses->values[i-1];
278 struct ldb_val *val2 = &allowedClasses->values[i];
279 if (data_blob_cmp(val1, val2) == 0) {
280 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
281 allowedClasses->num_values--;
282 i--;
283 }
284 }
285 }
286
287 return LDB_SUCCESS;
288 }
289
290 static int acl_check_access_on_class(struct ldb_module *module,
291 const struct dsdb_schema *schema,
292 TALLOC_CTX *mem_ctx,
293 struct security_descriptor *sd,
294 struct security_token *token,
295 struct dom_sid *rp_sid,
296 uint32_t access_mask,
297 const char *class_name)
298 {
299 int ret;
300 NTSTATUS status;
301 uint32_t access_granted;
302 struct object_tree *root = NULL;
303 struct object_tree *new_node = NULL;
304 const struct GUID *guid;
305
306 if (class_name != NULL) {
307 guid = class_schemaid_guid_by_lDAPDisplayName(schema, class_name);
308 if (!guid) {
309 DEBUG(10, ("acl_search: cannot find class %s\n",
310 class_name));
311 goto fail;
312 }
313 if (!insert_in_object_tree(mem_ctx,
314 guid, access_mask,
315 &root, &new_node)) {
316 DEBUG(10, ("acl_search: cannot add to object tree guid\n"));
317 goto fail;
318 }
319 }
320
321 status = sec_access_check_ds(sd, token,
322 access_mask,
323 &access_granted,
324 root,
325 rp_sid);
326 if (!NT_STATUS_IS_OK(status)) {
327 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
328 } else {
329 ret = LDB_SUCCESS;
330 }
331 return ret;
332 fail:
333 return ldb_operr(ldb_module_get_ctx(module));
334 }
335
336 static int acl_childClassesEffective(struct ldb_module *module,
337 const struct dsdb_schema *schema,
338 struct ldb_message *sd_msg,
339 struct ldb_message *msg,
340 struct acl_context *ac)
341 {
342 struct ldb_message_element *oc_el;
343 struct ldb_message_element *allowedClasses = NULL;
344 const struct dsdb_class *sclass;
345 struct security_descriptor *sd;
346 struct ldb_control *as_system = ldb_request_get_control(ac->req,
347 LDB_CONTROL_AS_SYSTEM_OID);
348 struct dom_sid *sid = NULL;
349 unsigned int i, j;
350 int ret;
351
352 if (as_system != NULL) {
353 as_system->critical = 0;
354 }
355
356 if (ac->am_system || as_system) {
357 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
358 }
359
360 /* If we don't have a schema yet, we can't do anything... */
361 if (schema == NULL) {
362 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
363 return LDB_ERR_OPERATIONS_ERROR;
364 }
365
366 /* Must remove any existing attribute, or else confusion reins */
367 ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
368
369 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
370 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
371 if (ret != LDB_SUCCESS) {
372 return ret;
373 }
374
375 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
376 for (i=0; oc_el && i < oc_el->num_values; i++) {
377 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
378 if (!sclass) {
379 /* We don't know this class? what is going on? */
380 continue;
381 }
382
383 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
384 ret = acl_check_access_on_class(module,
385 schema,
386 msg,
387 sd,
388 acl_user_token(module),
389 sid,
390 SEC_ADS_CREATE_CHILD,
391 sclass->possibleInferiors[j]);
392 if (ret == LDB_SUCCESS) {
393 ldb_msg_add_string(msg, "allowedChildClassesEffective",
394 sclass->possibleInferiors[j]);
395 }
396 }
397 }
398 allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
399 if (!allowedClasses) {
400 return LDB_SUCCESS;
401 }
402
403 if (allowedClasses->num_values > 1) {
404 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
405 for (i=1 ; i < allowedClasses->num_values; i++) {
406 struct ldb_val *val1 = &allowedClasses->values[i-1];
407 struct ldb_val *val2 = &allowedClasses->values[i];
408 if (data_blob_cmp(val1, val2) == 0) {
409 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
410 allowedClasses->num_values--;
411 i--;
412 }
413 }
414 }
415 return LDB_SUCCESS;
416 }
417
418 static int acl_sDRightsEffective(struct ldb_module *module,
419 struct ldb_message *sd_msg,
420 struct ldb_message *msg,
421 struct acl_context *ac)
422 {
423 struct ldb_message_element *rightsEffective;
424 int ret;
425 struct security_descriptor *sd;
426 struct ldb_control *as_system = ldb_request_get_control(ac->req,
427 LDB_CONTROL_AS_SYSTEM_OID);
428 struct dom_sid *sid = NULL;
429 uint32_t flags = 0;
430
431 if (as_system != NULL) {
432 as_system->critical = 0;
433 }
434
435 /* Must remove any existing attribute, or else confusion reins */
436 ldb_msg_remove_attr(msg, "sDRightsEffective");
437 ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
438 if (ret != LDB_SUCCESS) {
439 return ret;
440 }
441 if (ac->am_system || as_system) {
442 flags = SECINFO_OWNER | SECINFO_GROUP | SECINFO_SACL | SECINFO_DACL;
443 }
444 else {
445 /* Get the security descriptor from the message */
446 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
447 if (ret != LDB_SUCCESS) {
448 return ret;
449 }
450 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
451 ret = acl_check_access_on_attribute(module,
452 msg,
453 sd,
454 sid,
455 SEC_STD_WRITE_OWNER,
456 NULL);
457 if (ret == LDB_SUCCESS) {
458 flags |= SECINFO_OWNER | SECINFO_GROUP;
459 }
460 ret = acl_check_access_on_attribute(module,
461 msg,
462 sd,
463 sid,
464 SEC_STD_WRITE_DAC,
465 NULL);
466 if (ret == LDB_SUCCESS) {
467 flags |= SECINFO_DACL;
468 }
469 ret = acl_check_access_on_attribute(module,
470 msg,
471 sd,
472 sid,
473 SEC_FLAG_SYSTEM_SECURITY,
474 NULL);
475 if (ret == LDB_SUCCESS) {
476 flags |= SECINFO_SACL;
477 }
478 }
479 return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
480 "sDRightsEffective", flags);
481 }
482
483 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
484 struct ldb_context *ldb,
485 const char *spn_value,
486 uint32_t userAccountControl,
487 const char *samAccountName,
488 const char *dnsHostName,
489 const char *netbios_name,
490 const char *ntds_guid)
491 {
492 int ret;
493 krb5_context krb_ctx;
494 krb5_error_code kerr;
495 krb5_principal principal;
496 char *instanceName;
497 char *serviceType;
498 char *serviceName;
499 const char *forest_name = samdb_forest_name(ldb, mem_ctx);
500 const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
501 struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
502 struct loadparm_context);
503 bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
504 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
505
506 if (strcasecmp_m(spn_value, samAccountName) == 0) {
507 /* MacOS X sets this value, and setting an SPN of your
508 * own samAccountName is both pointless and safe */
509 return LDB_SUCCESS;
510 }
511
512 kerr = smb_krb5_init_context_basic(mem_ctx,
513 lp_ctx,
514 &krb_ctx);
515 if (kerr != 0) {
516 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
517 "Could not initialize kerberos context.");
518 }
519
520 ret = krb5_parse_name(krb_ctx, spn_value, &principal);
521 if (ret) {
522 krb5_free_context(krb_ctx);
523 return LDB_ERR_CONSTRAINT_VIOLATION;
524 }
525
526 if (principal->name.name_string.len < 2) {
527 goto fail;
528 }
529
530 instanceName = principal->name.name_string.val[1];
531 serviceType = principal->name.name_string.val[0];
532 if (principal->name.name_string.len == 3) {
533 serviceName = principal->name.name_string.val[2];
534 } else {
535 serviceName = NULL;
536 }
537
538 if (serviceName) {
539 if (!is_dc) {
540 goto fail;
541 }
542 if (strcasecmp(serviceType, "ldap") == 0) {
543 if (strcasecmp(serviceName, netbios_name) != 0 &&
544 strcasecmp(serviceName, forest_name) != 0) {
545 goto fail;
546 }
547
548 } else if (strcasecmp(serviceType, "gc") == 0) {
549 if (strcasecmp(serviceName, forest_name) != 0) {
550 goto fail;
551 }
552 } else {
553 if (strcasecmp(serviceName, base_domain) != 0 &&
554 strcasecmp(serviceName, netbios_name) != 0) {
555 goto fail;
556 }
557 }
558 }
559 /* instanceName can be samAccountName without $ or dnsHostName
560 * or "ntds_guid._msdcs.forest_domain for DC objects */
561 if (strlen(instanceName) == (strlen(samAccountName) - 1)
562 && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
563 goto success;
564 } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
565 goto success;
566 } else if (is_dc) {
567 const char *guid_str;
568 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
569 ntds_guid,
570 forest_name);
571 if (strcasecmp(instanceName, guid_str) == 0) {
572 goto success;
573 }
574 }
575
576 fail:
577 krb5_free_principal(krb_ctx, principal);
578 krb5_free_context(krb_ctx);
579 return LDB_ERR_CONSTRAINT_VIOLATION;
580
581 success:
582 krb5_free_principal(krb_ctx, principal);
583 krb5_free_context(krb_ctx);
584 return LDB_SUCCESS;
585 }
586
587 static int acl_check_spn(TALLOC_CTX *mem_ctx,
588 struct ldb_module *module,
589 struct ldb_request *req,
590 struct security_descriptor *sd,
591 struct dom_sid *sid,
592 const struct GUID *oc_guid,
593 const struct dsdb_attribute *attr)
594 {
595 int ret;
596 unsigned int i;
597 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
598 struct ldb_context *ldb = ldb_module_get_ctx(module);
599 struct ldb_result *acl_res;
600 struct ldb_result *netbios_res;
601 struct ldb_message_element *el;
602 struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
603 uint32_t userAccountControl;
604 const char *samAccountName;
605 const char *dnsHostName;
606 const char *netbios_name;
607 struct GUID ntds;
608 char *ntds_guid = NULL;
609
610 static const char *acl_attrs[] = {
611 "samAccountName",
612 "dnsHostName",
613 "userAccountControl",
614 NULL
615 };
616 static const char *netbios_attrs[] = {
617 "nETBIOSName",
618 NULL
619 };
620
621 /* if we have wp, we can do whatever we like */
622 if (acl_check_access_on_attribute(module,
623 tmp_ctx,
624 sd,
625 sid,
626 SEC_ADS_WRITE_PROP,
627 attr) == LDB_SUCCESS) {
628 talloc_free(tmp_ctx);
629 return LDB_SUCCESS;
630 }
631
632 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
633 GUID_DRS_VALIDATE_SPN,
634 SEC_ADS_SELF_WRITE,
635 sid);
636
637 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
638 dsdb_acl_debug(sd, acl_user_token(module),
639 req->op.mod.message->dn,
640 true,
641 10);
642 talloc_free(tmp_ctx);
643 return ret;
644 }
645
646 ret = dsdb_module_search_dn(module, tmp_ctx,
647 &acl_res, req->op.mod.message->dn,
648 acl_attrs,
649 DSDB_FLAG_NEXT_MODULE |
650 DSDB_SEARCH_SHOW_DELETED, req);
651 if (ret != LDB_SUCCESS) {
652 talloc_free(tmp_ctx);
653 return ret;
654 }
655
656 userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
657 dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
658 samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
659
660 ret = dsdb_module_search(module, tmp_ctx,
661 &netbios_res, partitions_dn,
662 LDB_SCOPE_ONELEVEL,
663 netbios_attrs,
664 DSDB_FLAG_NEXT_MODULE,
665 req,
666 "(ncName=%s)",
667 ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
668
669 netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
670
671 el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
672 if (!el) {
673 talloc_free(tmp_ctx);
674 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
675 "Error finding element for servicePrincipalName.");
676 }
677
678 /* NTDSDSA objectGuid of object we are checking SPN for */
679 if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
680 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
681 req->op.mod.message->dn, &ntds, req);
682 if (ret != LDB_SUCCESS) {
683 ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
684 ldb_dn_get_linearized(req->op.mod.message->dn),
685 ldb_strerror(ret));
686 talloc_free(tmp_ctx);
687 return LDB_ERR_OPERATIONS_ERROR;
688 }
689 ntds_guid = GUID_string(tmp_ctx, &ntds);
690 }
691
692 for (i=0; i < el->num_values; i++) {
693 ret = acl_validate_spn_value(tmp_ctx,
694 ldb,
695 (char *)el->values[i].data,
696 userAccountControl,
697 samAccountName,
698 dnsHostName,
699 netbios_name,
700 ntds_guid);
701 if (ret != LDB_SUCCESS) {
702 talloc_free(tmp_ctx);
703 return ret;
704 }
705 }
706 talloc_free(tmp_ctx);
707 return LDB_SUCCESS;
708 }
709
710 static int acl_add(struct ldb_module *module, struct ldb_request *req)
711 {
712 int ret;
713 struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
714 struct ldb_context *ldb;
715 const struct dsdb_schema *schema;
716 struct ldb_message_element *oc_el;
717 const struct GUID *guid;
718 struct ldb_dn *nc_root;
719 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
720
721 if (as_system != NULL) {
722 as_system->critical = 0;
723 }
724
725 if (dsdb_module_am_system(module) || as_system) {
726 return ldb_next_request(module, req);
727 }
728 if (ldb_dn_is_special(req->op.add.message->dn)) {
729 return ldb_next_request(module, req);
730 }
731
732 ldb = ldb_module_get_ctx(module);
733
734 /* Creating an NC. There is probably something we should do here,
735 * but we will establish that later */
736
737 ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
738 if (ret != LDB_SUCCESS) {
739 return ret;
740 }
741 if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
742 talloc_free(nc_root);
743 return ldb_next_request(module, req);
744 }
745 talloc_free(nc_root);
746
747 schema = dsdb_get_schema(ldb, req);
748 if (!schema) {
749 return ldb_operr(ldb);
750 }
751
752 oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
753 if (!oc_el || oc_el->num_values == 0) {
754 ldb_asprintf_errstring(ldb_module_get_ctx(module),
755 "acl: unable to find objectClass on %s\n",
756 ldb_dn_get_linearized(req->op.add.message->dn));
757 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
758 }
759
760 guid = class_schemaid_guid_by_lDAPDisplayName(schema,
761 (char *)oc_el->values[oc_el->num_values-1].data);
762 ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
763 if (ret != LDB_SUCCESS) {
764 return ret;
765 }
766 return ldb_next_request(module, req);
767 }
768
769 /* ckecks if modifications are allowed on "Member" attribute */
770 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
771 struct ldb_module *module,
772 struct ldb_request *req,
773 struct security_descriptor *sd,
774 struct dom_sid *sid,
775 const struct GUID *oc_guid,
776 const struct dsdb_attribute *attr)
777 {
778 int ret;
779 unsigned int i;
780 struct ldb_context *ldb = ldb_module_get_ctx(module);
781 struct ldb_dn *user_dn;
782 struct ldb_message_element *member_el;
783 /* if we have wp, we can do whatever we like */
784 if (acl_check_access_on_attribute(module,
785 mem_ctx,
786 sd,
787 sid,
788 SEC_ADS_WRITE_PROP,
789 attr) == LDB_SUCCESS) {
790 return LDB_SUCCESS;
791 }
792 /* if we are adding/deleting ourselves, check for self membership */
793 ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
794 &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
795 &user_dn);
796 if (ret != LDB_SUCCESS) {
797 return ret;
798 }
799 member_el = ldb_msg_find_element(req->op.mod.message, "member");
800 if (!member_el) {
801 return ldb_operr(ldb);
802 }
803 /* user can only remove oneself */
804 if (member_el->num_values == 0) {
805 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
806 }
807 for (i = 0; i < member_el->num_values; i++) {
808 if (strcasecmp((const char *)member_el->values[i].data,
809 ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
810 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
811 }
812 }
813 ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
814 GUID_DRS_SELF_MEMBERSHIP,
815 SEC_ADS_SELF_WRITE,
816 sid);
817 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
818 dsdb_acl_debug(sd, acl_user_token(module),
819 req->op.mod.message->dn,
820 true,
821 10);
822 }
823 return ret;
824 }
825
826 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
827 struct ldb_module *module,
828 struct ldb_request *req,
829 struct security_descriptor *sd,
830 struct dom_sid *sid,
831 const struct GUID *oc_guid,
832 bool userPassword)
833 {
834 int ret = LDB_SUCCESS;
835 unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
836 struct ldb_message_element *el;
837 struct ldb_message *msg;
838 const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
839 "unicodePwd", "dBCSPwd", NULL }, **l;
840 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
841
842 msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
843 if (msg == NULL) {
844 return ldb_module_oom(module);
845 }
846 for (l = passwordAttrs; *l != NULL; l++) {
847 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
848 continue;
849 }
850
851 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
852 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
853 ++del_attr_cnt;
854 }
855 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
856 ++add_attr_cnt;
857 }
858 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
859 ++rep_attr_cnt;
860 }
861 ldb_msg_remove_element(msg, el);
862 }
863 }
864
865 /* single deletes will be handled by the "password_hash" LDB module
866 * later in the stack, so we let it though here */
867 if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
868 talloc_free(tmp_ctx);
869 return LDB_SUCCESS;
870 }
871
872 if (ldb_request_get_control(req,
873 DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
874 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
875 * have a user password change and not a set as the message
876 * looks like. In it's value blob it contains the NT and/or LM
877 * hash of the old password specified by the user.
878 * This control is used by the SAMR and "kpasswd" password
879 * change mechanisms. */
880 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
881 GUID_DRS_USER_CHANGE_PASSWORD,
882 SEC_ADS_CONTROL_ACCESS,
883 sid);
884 }
885 else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
886 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
887 GUID_DRS_FORCE_CHANGE_PASSWORD,
888 SEC_ADS_CONTROL_ACCESS,
889 sid);
890 }
891 else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
892 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
893 GUID_DRS_USER_CHANGE_PASSWORD,
894 SEC_ADS_CONTROL_ACCESS,
895 sid);
896 /* Very strange, but we get constraint violation in this case */
897 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
898 ret = LDB_ERR_CONSTRAINT_VIOLATION;
899 }
900 }
901 if (ret != LDB_SUCCESS) {
902 dsdb_acl_debug(sd, acl_user_token(module),
903 req->op.mod.message->dn,
904 true,
905 10);
906 }
907 talloc_free(tmp_ctx);
908 return ret;
909 }
910
911 static const struct GUID *get_oc_guid_from_message(const struct dsdb_schema *schema,
912 struct ldb_message *msg)
913 {
914 struct ldb_message_element *oc_el;
915 const struct dsdb_class *object_class;
916
917 oc_el = ldb_msg_find_element(msg, "objectClass");
918 if (!oc_el) {
919 return NULL;
920 }
921
922 object_class = get_last_structural_class(schema, oc_el);
923 if (object_class == NULL) {
924 return NULL;
925 }
926
927 return &object_class->schemaIDGUID;
928 }
929
930
931 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
932 {
933 int ret;
934 struct ldb_context *ldb = ldb_module_get_ctx(module);
935 const struct dsdb_schema *schema;
936 unsigned int i;
937 const struct GUID *guid;
938 uint32_t access_granted;
939 struct object_tree *root = NULL;
940 struct object_tree *new_node = NULL;
941 NTSTATUS status;
942 struct ldb_result *acl_res;
943 struct security_descriptor *sd;
944 struct dom_sid *sid = NULL;
945 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
946 bool userPassword = dsdb_user_password_support(module, req, req);
947 TALLOC_CTX *tmp_ctx = talloc_new(req);
948 static const char *acl_attrs[] = {
949 "nTSecurityDescriptor",
950 "objectClass",
951 "objectSid",
952 NULL
953 };
954
955 if (as_system != NULL) {
956 as_system->critical = 0;
957 }
958
959 /* Don't print this debug statement if elements[0].name is going to be NULL */
960 if(req->op.mod.message->num_elements > 0)
961 {
962 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
963 }
964 if (dsdb_module_am_system(module) || as_system) {
965 return ldb_next_request(module, req);
966 }
967 if (ldb_dn_is_special(req->op.mod.message->dn)) {
968 return ldb_next_request(module, req);
969 }
970 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
971 acl_attrs,
972 DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
973 req);
974
975 if (ret != LDB_SUCCESS) {
976 goto fail;
977 }
978
979 schema = dsdb_get_schema(ldb, tmp_ctx);
980 if (!schema) {
981 ret = LDB_ERR_OPERATIONS_ERROR;
982 goto fail;
983 }
984
985 ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
986 if (ret != LDB_SUCCESS) {
987 talloc_free(tmp_ctx);
988 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
989 "acl_modify: Error retrieving security descriptor.");
990 }
991 /* Theoretically we pass the check if the object has no sd */
992 if (!sd) {
993 goto success;
994 }
995
996 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
997 if (!guid) {
998 talloc_free(tmp_ctx);
999 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1000 "acl_modify: Error retrieving object class GUID.");
1001 }
1002 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1003 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1004 &root, &new_node)) {
1005 talloc_free(tmp_ctx);
1006 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1007 "acl_modify: Error adding new node in object tree.");
1008 }
1009 for (i=0; i < req->op.mod.message->num_elements; i++){
1010 const struct dsdb_attribute *attr;
1011 attr = dsdb_attribute_by_lDAPDisplayName(schema,
1012 req->op.mod.message->elements[i].name);
1013
1014 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
1015 status = sec_access_check_ds(sd, acl_user_token(module),
1016 SEC_STD_WRITE_DAC,
1017 &access_granted,
1018 NULL,
1019 sid);
1020
1021 if (!NT_STATUS_IS_OK(status)) {
1022 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1023 "Object %s has no write dacl access\n",
1024 ldb_dn_get_linearized(req->op.mod.message->dn));
1025 dsdb_acl_debug(sd,
1026 acl_user_token(module),
1027 req->op.mod.message->dn,
1028 true,
1029 10);
1030 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1031 goto fail;
1032 }
1033 }
1034 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
1035 ret = acl_check_self_membership(tmp_ctx,
1036 module,
1037 req,
1038 sd,
1039 sid,
1040 guid,
1041 attr);
1042 if (ret != LDB_SUCCESS) {
1043 goto fail;
1044 }
1045 }
1046 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
1047 /* this one is not affected by any rights, we should let it through
1048 so that passwords_hash returns the correct error */
1049 continue;
1050 }
1051 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
1052 (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
1053 ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
1054 ret = acl_check_password_rights(tmp_ctx,
1055 module,
1056 req,
1057 sd,
1058 sid,
1059 guid,
1060 userPassword);
1061 if (ret != LDB_SUCCESS) {
1062 goto fail;
1063 }
1064 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
1065 ret = acl_check_spn(tmp_ctx,
1066 module,
1067 req,
1068 sd,
1069 sid,
1070 guid,
1071 attr);
1072 if (ret != LDB_SUCCESS) {
1073 goto fail;
1074 }
1075 } else {
1076
1077 /* This basic attribute existence check with the right errorcode
1078 * is needed since this module is the first one which requests
1079 * schema attribute information.
1080 * The complete attribute checking is done in the
1081 * "objectclass_attrs" module behind this one.
1082 */
1083 if (!attr) {
1084 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1085 req->op.mod.message->elements[i].name,
1086 ldb_dn_get_linearized(req->op.mod.message->dn));
1087 ret = LDB_ERR_NO_SUCH_ATTRIBUTE;
1088 goto fail;
1089 }
1090 if (!insert_in_object_tree(tmp_ctx,
1091 &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1092 &new_node, &new_node)) {
1093 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1094 "acl_modify: cannot add to object tree securityGUID\n");
1095 ret = LDB_ERR_OPERATIONS_ERROR;
1096 goto fail;
1097 }
1098
1099 if (!insert_in_object_tree(tmp_ctx,
1100 &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1101 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1102 "acl_modify: cannot add to object tree attributeGUID\n");
1103 ret = LDB_ERR_OPERATIONS_ERROR;
1104 goto fail;
1105 }
1106 }
1107 }
1108
1109 if (root->num_of_children > 0) {
1110 status = sec_access_check_ds(sd, acl_user_token(module),
1111 SEC_ADS_WRITE_PROP,
1112 &access_granted,
1113 root,
1114 sid);
1115
1116 if (!NT_STATUS_IS_OK(status)) {
1117 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1118 "Object %s has no write property access\n",
1119 ldb_dn_get_linearized(req->op.mod.message->dn));
1120 dsdb_acl_debug(sd,
1121 acl_user_token(module),
1122 req->op.mod.message->dn,
1123 true,
1124 10);
1125 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1126 goto fail;
1127 }
1128 }
1129
1130 success:
1131 talloc_free(tmp_ctx);
1132 return ldb_next_request(module, req);
1133 fail:
1134 talloc_free(tmp_ctx);
1135 return ret;
1136 }
1137
1138 /* similar to the modify for the time being.
1139 * We need to consider the special delete tree case, though - TODO */
1140 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1141 {
1142 int ret;
1143 struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1144 struct ldb_context *ldb;
1145 struct ldb_dn *nc_root;
1146 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1147
1148 if (as_system != NULL) {
1149 as_system->critical = 0;
1150 }
1151
1152 DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1153 if (dsdb_module_am_system(module) || as_system) {
1154 return ldb_next_request(module, req);
1155 }
1156 if (ldb_dn_is_special(req->op.del.dn)) {
1157 return ldb_next_request(module, req);
1158 }
1159
1160 ldb = ldb_module_get_ctx(module);
1161
1162 /* Make sure we aren't deleting a NC */
1163
1164 ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1165 if (ret != LDB_SUCCESS) {
1166 return ret;
1167 }
1168 if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1169 talloc_free(nc_root);
1170 DEBUG(10,("acl:deleting a NC\n"));
1171 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1172 return ldb_module_done(req, NULL, NULL,
1173 LDB_ERR_UNWILLING_TO_PERFORM);
1174 }
1175 talloc_free(nc_root);
1176
1177 /* First check if we have delete object right */
1178 ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1179 SEC_STD_DELETE, NULL, req);
1180 if (ret == LDB_SUCCESS) {
1181 return ldb_next_request(module, req);
1182 }
1183
1184 /* Nope, we don't have delete object. Lets check if we have delete
1185 * child on the parent */
1186 ret = dsdb_module_check_access_on_dn(module, req, parent,
1187 SEC_ADS_DELETE_CHILD, NULL, req);
1188 if (ret != LDB_SUCCESS) {
1189 return ret;
1190 }
1191
1192 return ldb_next_request(module, req);
1193 }
1194
1195 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1196 {
1197 int ret;
1198 struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1199 struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1200 const struct dsdb_schema *schema;
1201 struct ldb_context *ldb;
1202 struct security_descriptor *sd = NULL;
1203 struct dom_sid *sid = NULL;
1204 struct ldb_result *acl_res;
1205 const struct GUID *guid;
1206 struct ldb_dn *nc_root;
1207 struct object_tree *root = NULL;
1208 struct object_tree *new_node = NULL;
1209 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1210 TALLOC_CTX *tmp_ctx = talloc_new(req);
1211 NTSTATUS status;
1212 uint32_t access_granted;
1213 const char *rdn_name;
1214 static const char *acl_attrs[] = {
1215 "nTSecurityDescriptor",
1216 "objectClass",
1217 "objectSid",
1218 NULL
1219 };
1220
1221 if (as_system != NULL) {
1222 as_system->critical = 0;
1223 }
1224
1225 DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1226 if (dsdb_module_am_system(module) || as_system) {
1227 return ldb_next_request(module, req);
1228 }
1229 if (ldb_dn_is_special(req->op.rename.olddn)) {
1230 return ldb_next_request(module, req);
1231 }
1232
1233 ldb = ldb_module_get_ctx(module);
1234
1235 /* Make sure we aren't renaming/moving a NC */
1236
1237 ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1238 if (ret != LDB_SUCCESS) {
1239 return ret;
1240 }
1241 if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1242 talloc_free(nc_root);
1243 DEBUG(10,("acl:renaming/moving a NC\n"));
1244 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1245 return ldb_module_done(req, NULL, NULL,
1246 LDB_ERR_UNWILLING_TO_PERFORM);
1247 }
1248 talloc_free(nc_root);
1249
1250 /* Look for the parent */
1251
1252 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1253 req->op.rename.olddn, acl_attrs,
1254 DSDB_FLAG_NEXT_MODULE |
1255 DSDB_SEARCH_SHOW_RECYCLED, req);
1256 /* we sould be able to find the parent */
1257 if (ret != LDB_SUCCESS) {
1258 DEBUG(10,("acl: failed to find object %s\n",
1259 ldb_dn_get_linearized(req->op.rename.olddn)));
1260 talloc_free(tmp_ctx);
1261 return ret;
1262 }
1263
1264 schema = dsdb_get_schema(ldb, acl_res);
1265 if (!schema) {
1266 talloc_free(tmp_ctx);
1267 return ldb_operr(ldb);
1268 }
1269
1270 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1271 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1272 &root, &new_node)) {
1273 talloc_free(tmp_ctx);
1274 return ldb_operr(ldb);
1275 };
1276
1277 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1278 "name");
1279 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1280 &new_node, &new_node)) {
1281 talloc_free(tmp_ctx);
1282 return ldb_operr(ldb);
1283 };
1284
1285 rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1286 if (rdn_name == NULL) {
1287 talloc_free(tmp_ctx);
1288 return ldb_operr(ldb);
1289 }
1290 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1291 rdn_name);
1292 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1293 &new_node, &new_node)) {
1294 talloc_free(tmp_ctx);
1295 return ldb_operr(ldb);
1296 };
1297
1298 ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1299
1300 if (ret != LDB_SUCCESS) {
1301 talloc_free(tmp_ctx);
1302 return ldb_operr(ldb);
1303 }
1304 /* Theoretically we pass the check if the object has no sd */
1305 if (!sd) {
1306 talloc_free(tmp_ctx);
1307 return LDB_SUCCESS;
1308 }
1309 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1310 status = sec_access_check_ds(sd, acl_user_token(module),
1311 SEC_ADS_WRITE_PROP,
1312 &access_granted,
1313 root,
1314 sid);
1315
1316 if (!NT_STATUS_IS_OK(status)) {
1317 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1318 "Object %s has no wp on name\n",
1319 ldb_dn_get_linearized(req->op.rename.olddn));
1320 dsdb_acl_debug(sd,
1321 acl_user_token(module),
1322 req->op.rename.olddn,
1323 true,
1324 10);
1325 talloc_free(tmp_ctx);
1326 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1327 }
1328
1329 if (ldb_dn_compare(oldparent, newparent) == 0) {
1330 /* regular rename, not move, nothing more to do */
1331 talloc_free(tmp_ctx);
1332 return ldb_next_request(module, req);
1333 }
1334
1335 /* new parent should have create child */
1336 root = NULL;
1337 new_node = NULL;
1338 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1339 if (!guid) {
1340 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1341 "acl:renamed object has no object class\n");
1342 talloc_free(tmp_ctx);
1343 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
1344 }
1345
1346 ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1347 if (ret != LDB_SUCCESS) {
1348 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1349 "acl:access_denied renaming %s",
1350 ldb_dn_get_linearized(req->op.rename.olddn));
1351 talloc_free(tmp_ctx);
1352 return ret;
1353 }
1354 /* do we have delete object on the object? */
1355
1356 status = sec_access_check_ds(sd, acl_user_token(module),
1357 SEC_STD_DELETE,
1358 &access_granted,
1359 NULL,
1360 sid);
1361
1362 if (NT_STATUS_IS_OK(status)) {
1363 talloc_free(tmp_ctx);
1364 return ldb_next_request(module, req);
1365 }
1366 /* what about delete child on the current parent */
1367 ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1368 if (ret != LDB_SUCCESS) {
1369 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1370 "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1371 talloc_free(tmp_ctx);
1372 return ldb_module_done(req, NULL, NULL, ret);
1373 }
1374
1375 talloc_free(tmp_ctx);
1376
1377 return ldb_next_request(module, req);
1378 }
1379
1380 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1381 {
1382 struct acl_context *ac;
1383 struct acl_private *data;
1384 struct ldb_result *acl_res;
1385 static const char *acl_attrs[] = {
1386 "objectClass",
1387 "nTSecurityDescriptor",
1388 "objectSid",
1389 NULL
1390 };
1391 int ret;
1392 unsigned int i;
1393
1394 ac = talloc_get_type(req->context, struct acl_context);
1395 data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1396 if (!ares) {
1397 return ldb_module_done(ac->req, NULL, NULL,
1398 LDB_ERR_OPERATIONS_ERROR);
1399 }
1400 if (ares->error != LDB_SUCCESS) {
1401 return ldb_module_done(ac->req, ares->controls,
1402 ares->response, ares->error);
1403 }
1404
1405 switch (ares->type) {
1406 case LDB_REPLY_ENTRY:
1407 if (ac->allowedAttributes
1408 || ac->allowedChildClasses
1409 || ac->allowedChildClassesEffective
1410 || ac->allowedAttributesEffective
1411 || ac->sDRightsEffective) {
1412 ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1413 acl_attrs,
1414 DSDB_FLAG_NEXT_MODULE |
1415 DSDB_SEARCH_SHOW_DELETED, req);
1416 if (ret != LDB_SUCCESS) {
1417 return ldb_module_done(ac->req, NULL, NULL, ret);
1418 }
1419 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1420 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1421 if (ret != LDB_SUCCESS) {
1422 return ldb_module_done(ac->req, NULL, NULL, ret);
1423 }
1424 }
1425 if (ac->allowedChildClasses) {
1426 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1427 ares->message, "allowedChildClasses");
1428 if (ret != LDB_SUCCESS) {
1429 return ldb_module_done(ac->req, NULL, NULL, ret);
1430 }
1431 }
1432 if (ac->allowedChildClassesEffective) {
1433 ret = acl_childClassesEffective(ac->module, ac->schema,
1434 acl_res->msgs[0], ares->message, ac);
1435 if (ret != LDB_SUCCESS) {
1436 return ldb_module_done(ac->req, NULL, NULL, ret);
1437 }
1438 }
1439 if (ac->sDRightsEffective) {
1440 ret = acl_sDRightsEffective(ac->module,
1441 acl_res->msgs[0], ares->message, ac);
1442 if (ret != LDB_SUCCESS) {
1443 return ldb_module_done(ac->req, NULL, NULL, ret);
1444 }
1445 }
1446 }
1447 if (data && data->password_attrs) {
1448 if (!ac->am_system) {
1449 for (i = 0; data->password_attrs[i]; i++) {
1450 if ((!ac->userPassword) &&
1451 (ldb_attr_cmp(data->password_attrs[i],
1452 "userPassword") == 0))
1453 continue;
1454
1455 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1456 }
1457 }
1458 }
1459 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1460
1461 case LDB_REPLY_REFERRAL:
1462 return ldb_module_send_referral(ac->req, ares->referral);
1463
1464 case LDB_REPLY_DONE:
1465 return ldb_module_done(ac->req, ares->controls,
1466 ares->response, LDB_SUCCESS);
1467
1468 }
1469 return LDB_SUCCESS;
1470 }
1471
1472 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1473 {
1474 struct ldb_context *ldb;
1475 struct acl_context *ac;
1476 struct ldb_request *down_req;
1477 struct acl_private *data;
1478 int ret;
1479 unsigned int i;
1480
1481 ldb = ldb_module_get_ctx(module);
1482
1483 ac = talloc_zero(req, struct acl_context);
1484 if (ac == NULL) {
1485 return ldb_oom(ldb);
1486 }
1487 data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1488
1489 ac->module = module;
1490 ac->req = req;
1491 ac->am_system = dsdb_module_am_system(module);
1492 ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1493 ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1494 ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1495 ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1496 ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1497 ac->userPassword = dsdb_user_password_support(module, ac, req);
1498 ac->schema = dsdb_get_schema(ldb, ac);
1499
1500 /* replace any attributes in the parse tree that are private,
1501 so we don't allow a search for 'userPassword=penguin',
1502 just as we would not allow that attribute to be returned */
1503 if (ac->am_system) {
1504 /* FIXME: We should copy the tree and keep the original unmodified. */
1505 /* remove password attributes */
1506 if (data && data->password_attrs) {
1507 for (i = 0; data->password_attrs[i]; i++) {
1508 if ((!ac->userPassword) &&
1509 (ldb_attr_cmp(data->password_attrs[i],
1510 "userPassword") == 0))
1511 continue;
1512
1513 ldb_parse_tree_attr_replace(req->op.search.tree,
1514 data->password_attrs[i],
1515 "kludgeACLredactedattribute");
1516 }
1517 }
1518 }
1519 ret = ldb_build_search_req_ex(&down_req,
1520 ldb, ac,
1521 req->op.search.base,
1522 req->op.search.scope,
1523 req->op.search.tree,
1524 req->op.search.attrs,
1525 req->controls,
1526 ac, acl_search_callback,
1527 req);
1528 LDB_REQ_SET_LOCATION(down_req);
1529 if (ret != LDB_SUCCESS) {
1530 return ret;
1531 }
1532 /* perform the search */
1533 return ldb_next_request(module, down_req);
1534 }
1535
1536 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1537 {
1538 struct ldb_context *ldb = ldb_module_get_ctx(module);
1539 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1540
1541 /* allow everybody to read the sequence number */
1542 if (strcmp(req->op.extended.oid,
1543 LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1544 return ldb_next_request(module, req);
1545 }
1546
1547 if (dsdb_module_am_system(module) ||
1548 dsdb_module_am_administrator(module) || as_system) {
1549 return ldb_next_request(module, req);
1550 } else {
1551 ldb_asprintf_errstring(ldb,
1552 "acl_extended: "
1553 "attempted database modify not permitted. "
1554 "User %s is not SYSTEM or an administrator",
1555 acl_user_name(req, module));
1556 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1557 }
1558 }
1559
1560 static const struct ldb_module_ops ldb_acl_module_ops = {
1561 .name = "acl",
1562 .search = acl_search,
1563 .add = acl_add,
1564 .modify = acl_modify,
1565 .del = acl_delete,
1566 .rename = acl_rename,
1567 .extended = acl_extended,
1568 .init_context = acl_module_init
1569 };
1570
1571 int ldb_acl_module_init(const char *version)
1572 {
1573 LDB_MODULE_CHECK_VERSION(version);
1574 return ldb_register_module(&ldb_acl_module_ops);
1575 }
stuff from bjacke