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s4:dsdb/acl: fix search filter cleanup for password attributes
[Samba/gbeck.git] / source4 / dsdb / samdb / ldb_modules / acl.c
blob05926fb01b387d5582c479b46ec82b8554f509bc
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 };
55
56 struct acl_context {
57 struct ldb_module *module;
58 struct ldb_request *req;
59 bool am_system;
60 bool allowedAttributes;
61 bool allowedAttributesEffective;
62 bool allowedChildClasses;
63 bool allowedChildClassesEffective;
64 bool sDRightsEffective;
65 bool userPassword;
66 const char * const *attrs;
67 struct dsdb_schema *schema;
68 };
69
70 static int acl_module_init(struct ldb_module *module)
71 {
72 struct ldb_context *ldb;
73 struct acl_private *data;
74 int ret;
75 unsigned int i;
76 TALLOC_CTX *mem_ctx;
77 static const char *attrs[] = { "passwordAttribute", NULL };
78 struct ldb_result *res;
79 struct ldb_message *msg;
80 struct ldb_message_element *password_attributes;
81
82 ldb = ldb_module_get_ctx(module);
83
84 ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
85 if (ret != LDB_SUCCESS) {
86 ldb_debug(ldb, LDB_DEBUG_ERROR,
87 "acl_module_init: Unable to register control with rootdse!\n");
88 return ldb_operr(ldb);
89 }
90
91 data = talloc(module, struct acl_private);
92 if (data == NULL) {
93 return ldb_oom(ldb);
94 }
95
96 data->password_attrs = NULL;
97 data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
98 NULL, "acl", "perform", false);
99 ldb_module_set_private(module, data);
100
101 mem_ctx = talloc_new(module);
102 if (!mem_ctx) {
103 return ldb_oom(ldb);
104 }
105
106 ret = dsdb_module_search_dn(module, mem_ctx, &res,
107 ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
108 attrs,
109 DSDB_FLAG_NEXT_MODULE, NULL);
110 if (ret != LDB_SUCCESS) {
111 goto done;
112 }
113 if (res->count == 0) {
114 goto done;
115 }
116
117 if (res->count > 1) {
118 talloc_free(mem_ctx);
119 return LDB_ERR_CONSTRAINT_VIOLATION;
120 }
121
122 msg = res->msgs[0];
123
124 password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
125 if (!password_attributes) {
126 goto done;
127 }
128 data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
129 if (!data->password_attrs) {
130 talloc_free(mem_ctx);
131 return ldb_oom(ldb);
132 }
133 for (i=0; i < password_attributes->num_values; i++) {
134 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
135 talloc_steal(data->password_attrs, password_attributes->values[i].data);
136 }
137 data->password_attrs[i] = NULL;
138
139 done:
140 talloc_free(mem_ctx);
141 return ldb_next_init(module);
142 }
143
144 static int acl_allowedAttributes(struct ldb_module *module,
145 const struct dsdb_schema *schema,
146 struct ldb_message *sd_msg,
147 struct ldb_message *msg,
148 struct acl_context *ac)
149 {
150 struct ldb_message_element *oc_el;
151 struct ldb_context *ldb = ldb_module_get_ctx(module);
152 TALLOC_CTX *mem_ctx;
153 const char **attr_list;
154 int i, ret;
155
156 /* If we don't have a schema yet, we can't do anything... */
157 if (schema == NULL) {
158 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
159 return LDB_ERR_OPERATIONS_ERROR;
160 }
161
162 /* Must remove any existing attribute */
163 if (ac->allowedAttributes) {
164 ldb_msg_remove_attr(msg, "allowedAttributes");
165 }
166
167 mem_ctx = talloc_new(msg);
168 if (!mem_ctx) {
169 return ldb_oom(ldb);
170 }
171
172 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
173 attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
174 if (!attr_list) {
175 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
176 talloc_free(mem_ctx);
177 return LDB_ERR_OPERATIONS_ERROR;
178 }
179 if (ac->allowedAttributes) {
180 for (i=0; attr_list && attr_list[i]; i++) {
181 ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
182 }
183 }
184 if (ac->allowedAttributesEffective) {
185 struct security_descriptor *sd;
186 struct dom_sid *sid = NULL;
187 struct ldb_control *as_system = ldb_request_get_control(ac->req,
188 LDB_CONTROL_AS_SYSTEM_OID);
189
190 if (as_system != NULL) {
191 as_system->critical = 0;
192 }
193
194 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
195 if (ac->am_system || as_system) {
196 for (i=0; attr_list && attr_list[i]; i++) {
197 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
198 }
199 return LDB_SUCCESS;
200 }
201
202 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
203
204 if (ret != LDB_SUCCESS) {
205 return ret;
206 }
207
208 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
209 for (i=0; attr_list && attr_list[i]; i++) {
210 const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
211 attr_list[i]);
212 if (!attr) {
213 return ldb_operr(ldb);
214 }
215 /* remove constructed attributes */
216 if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
217 || attr->systemOnly
218 || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
219 continue;
220 }
221 ret = acl_check_access_on_attribute(module,
222 msg,
223 sd,
224 sid,
225 SEC_ADS_WRITE_PROP,
226 attr);
227 if (ret == LDB_SUCCESS) {
228 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
229 }
230 }
231 }
232 return LDB_SUCCESS;
233 }
234
235 static int acl_childClasses(struct ldb_module *module,
236 const struct dsdb_schema *schema,
237 struct ldb_message *sd_msg,
238 struct ldb_message *msg,
239 const char *attrName)
240 {
241 struct ldb_message_element *oc_el;
242 struct ldb_message_element *allowedClasses;
243 const struct dsdb_class *sclass;
244 unsigned int i, j;
245 int ret;
246
247 /* If we don't have a schema yet, we can't do anything... */
248 if (schema == NULL) {
249 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
250 return LDB_ERR_OPERATIONS_ERROR;
251 }
252
253 /* Must remove any existing attribute, or else confusion reins */
254 ldb_msg_remove_attr(msg, attrName);
255 ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
256 if (ret != LDB_SUCCESS) {
257 return ret;
258 }
259
260 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
261
262 for (i=0; oc_el && i < oc_el->num_values; i++) {
263 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
264 if (!sclass) {
265 /* We don't know this class? what is going on? */
266 continue;
267 }
268
269 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
270 ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
271 }
272 }
273 if (allowedClasses->num_values > 1) {
274 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
275 for (i=1 ; i < allowedClasses->num_values; i++) {
276 struct ldb_val *val1 = &allowedClasses->values[i-1];
277 struct ldb_val *val2 = &allowedClasses->values[i];
278 if (data_blob_cmp(val1, val2) == 0) {
279 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
280 allowedClasses->num_values--;
281 i--;
282 }
283 }
284 }
285
286 return LDB_SUCCESS;
287 }
288
289 static int acl_check_access_on_class(struct ldb_module *module,
290 const struct dsdb_schema *schema,
291 TALLOC_CTX *mem_ctx,
292 struct security_descriptor *sd,
293 struct security_token *token,
294 struct dom_sid *rp_sid,
295 uint32_t access_mask,
296 const char *class_name)
297 {
298 int ret;
299 NTSTATUS status;
300 uint32_t access_granted;
301 struct object_tree *root = NULL;
302 struct object_tree *new_node = NULL;
303 const struct GUID *guid;
304
305 if (class_name != NULL) {
306 guid = class_schemaid_guid_by_lDAPDisplayName(schema, class_name);
307 if (!guid) {
308 DEBUG(10, ("acl_search: cannot find class %s\n",
309 class_name));
310 goto fail;
311 }
312 if (!insert_in_object_tree(mem_ctx,
313 guid, access_mask,
314 &root, &new_node)) {
315 DEBUG(10, ("acl_search: cannot add to object tree guid\n"));
316 goto fail;
317 }
318 }
319
320 status = sec_access_check_ds(sd, token,
321 access_mask,
322 &access_granted,
323 root,
324 rp_sid);
325 if (!NT_STATUS_IS_OK(status)) {
326 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
327 } else {
328 ret = LDB_SUCCESS;
329 }
330 return ret;
331 fail:
332 return ldb_operr(ldb_module_get_ctx(module));
333 }
334
335 static int acl_childClassesEffective(struct ldb_module *module,
336 const struct dsdb_schema *schema,
337 struct ldb_message *sd_msg,
338 struct ldb_message *msg,
339 struct acl_context *ac)
340 {
341 struct ldb_message_element *oc_el;
342 struct ldb_message_element *allowedClasses = NULL;
343 const struct dsdb_class *sclass;
344 struct security_descriptor *sd;
345 struct ldb_control *as_system = ldb_request_get_control(ac->req,
346 LDB_CONTROL_AS_SYSTEM_OID);
347 struct dom_sid *sid = NULL;
348 unsigned int i, j;
349 int ret;
350
351 if (as_system != NULL) {
352 as_system->critical = 0;
353 }
354
355 if (ac->am_system || as_system) {
356 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
357 }
358
359 /* If we don't have a schema yet, we can't do anything... */
360 if (schema == NULL) {
361 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
362 return LDB_ERR_OPERATIONS_ERROR;
363 }
364
365 /* Must remove any existing attribute, or else confusion reins */
366 ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
367
368 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
369 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
370 if (ret != LDB_SUCCESS) {
371 return ret;
372 }
373
374 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
375 for (i=0; oc_el && i < oc_el->num_values; i++) {
376 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
377 if (!sclass) {
378 /* We don't know this class? what is going on? */
379 continue;
380 }
381
382 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
383 ret = acl_check_access_on_class(module,
384 schema,
385 msg,
386 sd,
387 acl_user_token(module),
388 sid,
389 SEC_ADS_CREATE_CHILD,
390 sclass->possibleInferiors[j]);
391 if (ret == LDB_SUCCESS) {
392 ldb_msg_add_string(msg, "allowedChildClassesEffective",
393 sclass->possibleInferiors[j]);
394 }
395 }
396 }
397 allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
398 if (!allowedClasses) {
399 return LDB_SUCCESS;
400 }
401
402 if (allowedClasses->num_values > 1) {
403 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
404 for (i=1 ; i < allowedClasses->num_values; i++) {
405 struct ldb_val *val1 = &allowedClasses->values[i-1];
406 struct ldb_val *val2 = &allowedClasses->values[i];
407 if (data_blob_cmp(val1, val2) == 0) {
408 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
409 allowedClasses->num_values--;
410 i--;
411 }
412 }
413 }
414 return LDB_SUCCESS;
415 }
416
417 static int acl_sDRightsEffective(struct ldb_module *module,
418 struct ldb_message *sd_msg,
419 struct ldb_message *msg,
420 struct acl_context *ac)
421 {
422 struct ldb_message_element *rightsEffective;
423 int ret;
424 struct security_descriptor *sd;
425 struct ldb_control *as_system = ldb_request_get_control(ac->req,
426 LDB_CONTROL_AS_SYSTEM_OID);
427 struct dom_sid *sid = NULL;
428 uint32_t flags = 0;
429
430 if (as_system != NULL) {
431 as_system->critical = 0;
432 }
433
434 /* Must remove any existing attribute, or else confusion reins */
435 ldb_msg_remove_attr(msg, "sDRightsEffective");
436 ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
437 if (ret != LDB_SUCCESS) {
438 return ret;
439 }
440 if (ac->am_system || as_system) {
441 flags = SECINFO_OWNER | SECINFO_GROUP | SECINFO_SACL | SECINFO_DACL;
442 }
443 else {
444 /* Get the security descriptor from the message */
445 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
446 if (ret != LDB_SUCCESS) {
447 return ret;
448 }
449 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
450 ret = acl_check_access_on_attribute(module,
451 msg,
452 sd,
453 sid,
454 SEC_STD_WRITE_OWNER,
455 NULL);
456 if (ret == LDB_SUCCESS) {
457 flags |= SECINFO_OWNER | SECINFO_GROUP;
458 }
459 ret = acl_check_access_on_attribute(module,
460 msg,
461 sd,
462 sid,
463 SEC_STD_WRITE_DAC,
464 NULL);
465 if (ret == LDB_SUCCESS) {
466 flags |= SECINFO_DACL;
467 }
468 ret = acl_check_access_on_attribute(module,
469 msg,
470 sd,
471 sid,
472 SEC_FLAG_SYSTEM_SECURITY,
473 NULL);
474 if (ret == LDB_SUCCESS) {
475 flags |= SECINFO_SACL;
476 }
477 }
478 return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
479 "sDRightsEffective", flags);
480 }
481
482 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
483 struct ldb_context *ldb,
484 const char *spn_value,
485 uint32_t userAccountControl,
486 const char *samAccountName,
487 const char *dnsHostName,
488 const char *netbios_name,
489 const char *ntds_guid)
490 {
491 int ret;
492 krb5_context krb_ctx;
493 krb5_error_code kerr;
494 krb5_principal principal;
495 char *instanceName;
496 char *serviceType;
497 char *serviceName;
498 const char *forest_name = samdb_forest_name(ldb, mem_ctx);
499 const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
500 struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
501 struct loadparm_context);
502 bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
503 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
504
505 if (strcasecmp_m(spn_value, samAccountName) == 0) {
506 /* MacOS X sets this value, and setting an SPN of your
507 * own samAccountName is both pointless and safe */
508 return LDB_SUCCESS;
509 }
510
511 kerr = smb_krb5_init_context_basic(mem_ctx,
512 lp_ctx,
513 &krb_ctx);
514 if (kerr != 0) {
515 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
516 "Could not initialize kerberos context.");
517 }
518
519 ret = krb5_parse_name(krb_ctx, spn_value, &principal);
520 if (ret) {
521 krb5_free_context(krb_ctx);
522 return LDB_ERR_CONSTRAINT_VIOLATION;
523 }
524
525 if (principal->name.name_string.len < 2) {
526 goto fail;
527 }
528
529 instanceName = principal->name.name_string.val[1];
530 serviceType = principal->name.name_string.val[0];
531 if (principal->name.name_string.len == 3) {
532 serviceName = principal->name.name_string.val[2];
533 } else {
534 serviceName = NULL;
535 }
536
537 if (serviceName) {
538 if (!is_dc) {
539 goto fail;
540 }
541 if (strcasecmp(serviceType, "ldap") == 0) {
542 if (strcasecmp(serviceName, netbios_name) != 0 &&
543 strcasecmp(serviceName, forest_name) != 0) {
544 goto fail;
545 }
546
547 } else if (strcasecmp(serviceType, "gc") == 0) {
548 if (strcasecmp(serviceName, forest_name) != 0) {
549 goto fail;
550 }
551 } else {
552 if (strcasecmp(serviceName, base_domain) != 0 &&
553 strcasecmp(serviceName, netbios_name) != 0) {
554 goto fail;
555 }
556 }
557 }
558 /* instanceName can be samAccountName without $ or dnsHostName
559 * or "ntds_guid._msdcs.forest_domain for DC objects */
560 if (strlen(instanceName) == (strlen(samAccountName) - 1)
561 && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
562 goto success;
563 } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
564 goto success;
565 } else if (is_dc) {
566 const char *guid_str;
567 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
568 ntds_guid,
569 forest_name);
570 if (strcasecmp(instanceName, guid_str) == 0) {
571 goto success;
572 }
573 }
574
575 fail:
576 krb5_free_principal(krb_ctx, principal);
577 krb5_free_context(krb_ctx);
578 return LDB_ERR_CONSTRAINT_VIOLATION;
579
580 success:
581 krb5_free_principal(krb_ctx, principal);
582 krb5_free_context(krb_ctx);
583 return LDB_SUCCESS;
584 }
585
586 static int acl_check_spn(TALLOC_CTX *mem_ctx,
587 struct ldb_module *module,
588 struct ldb_request *req,
589 struct security_descriptor *sd,
590 struct dom_sid *sid,
591 const struct GUID *oc_guid,
592 const struct dsdb_attribute *attr)
593 {
594 int ret;
595 unsigned int i;
596 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
597 struct ldb_context *ldb = ldb_module_get_ctx(module);
598 struct ldb_result *acl_res;
599 struct ldb_result *netbios_res;
600 struct ldb_message_element *el;
601 struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
602 uint32_t userAccountControl;
603 const char *samAccountName;
604 const char *dnsHostName;
605 const char *netbios_name;
606 struct GUID ntds;
607 char *ntds_guid = NULL;
608
609 static const char *acl_attrs[] = {
610 "samAccountName",
611 "dnsHostName",
612 "userAccountControl",
613 NULL
614 };
615 static const char *netbios_attrs[] = {
616 "nETBIOSName",
617 NULL
618 };
619
620 /* if we have wp, we can do whatever we like */
621 if (acl_check_access_on_attribute(module,
622 tmp_ctx,
623 sd,
624 sid,
625 SEC_ADS_WRITE_PROP,
626 attr) == LDB_SUCCESS) {
627 talloc_free(tmp_ctx);
628 return LDB_SUCCESS;
629 }
630
631 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
632 GUID_DRS_VALIDATE_SPN,
633 SEC_ADS_SELF_WRITE,
634 sid);
635
636 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
637 dsdb_acl_debug(sd, acl_user_token(module),
638 req->op.mod.message->dn,
639 true,
640 10);
641 talloc_free(tmp_ctx);
642 return ret;
643 }
644
645 ret = dsdb_module_search_dn(module, tmp_ctx,
646 &acl_res, req->op.mod.message->dn,
647 acl_attrs,
648 DSDB_FLAG_NEXT_MODULE |
649 DSDB_SEARCH_SHOW_DELETED, req);
650 if (ret != LDB_SUCCESS) {
651 talloc_free(tmp_ctx);
652 return ret;
653 }
654
655 userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
656 dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
657 samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
658
659 ret = dsdb_module_search(module, tmp_ctx,
660 &netbios_res, partitions_dn,
661 LDB_SCOPE_ONELEVEL,
662 netbios_attrs,
663 DSDB_FLAG_NEXT_MODULE,
664 req,
665 "(ncName=%s)",
666 ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
667
668 netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
669
670 el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
671 if (!el) {
672 talloc_free(tmp_ctx);
673 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
674 "Error finding element for servicePrincipalName.");
675 }
676
677 /* NTDSDSA objectGuid of object we are checking SPN for */
678 if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
679 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
680 req->op.mod.message->dn, &ntds, req);
681 if (ret != LDB_SUCCESS) {
682 ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
683 ldb_dn_get_linearized(req->op.mod.message->dn),
684 ldb_strerror(ret));
685 talloc_free(tmp_ctx);
686 return LDB_ERR_OPERATIONS_ERROR;
687 }
688 ntds_guid = GUID_string(tmp_ctx, &ntds);
689 }
690
691 for (i=0; i < el->num_values; i++) {
692 ret = acl_validate_spn_value(tmp_ctx,
693 ldb,
694 (char *)el->values[i].data,
695 userAccountControl,
696 samAccountName,
697 dnsHostName,
698 netbios_name,
699 ntds_guid);
700 if (ret != LDB_SUCCESS) {
701 talloc_free(tmp_ctx);
702 return ret;
703 }
704 }
705 talloc_free(tmp_ctx);
706 return LDB_SUCCESS;
707 }
708
709 static int acl_add(struct ldb_module *module, struct ldb_request *req)
710 {
711 int ret;
712 struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
713 struct ldb_context *ldb;
714 const struct dsdb_schema *schema;
715 struct ldb_message_element *oc_el;
716 const struct GUID *guid;
717 struct ldb_dn *nc_root;
718 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
719
720 if (as_system != NULL) {
721 as_system->critical = 0;
722 }
723
724 if (dsdb_module_am_system(module) || as_system) {
725 return ldb_next_request(module, req);
726 }
727 if (ldb_dn_is_special(req->op.add.message->dn)) {
728 return ldb_next_request(module, req);
729 }
730
731 ldb = ldb_module_get_ctx(module);
732
733 /* Creating an NC. There is probably something we should do here,
734 * but we will establish that later */
735
736 ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
737 if (ret != LDB_SUCCESS) {
738 return ret;
739 }
740 if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
741 talloc_free(nc_root);
742 return ldb_next_request(module, req);
743 }
744 talloc_free(nc_root);
745
746 schema = dsdb_get_schema(ldb, req);
747 if (!schema) {
748 return ldb_operr(ldb);
749 }
750
751 oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
752 if (!oc_el || oc_el->num_values == 0) {
753 ldb_asprintf_errstring(ldb_module_get_ctx(module),
754 "acl: unable to find objectClass on %s\n",
755 ldb_dn_get_linearized(req->op.add.message->dn));
756 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
757 }
758
759 guid = class_schemaid_guid_by_lDAPDisplayName(schema,
760 (char *)oc_el->values[oc_el->num_values-1].data);
761 ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
762 if (ret != LDB_SUCCESS) {
763 return ret;
764 }
765 return ldb_next_request(module, req);
766 }
767
768 /* ckecks if modifications are allowed on "Member" attribute */
769 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
770 struct ldb_module *module,
771 struct ldb_request *req,
772 struct security_descriptor *sd,
773 struct dom_sid *sid,
774 const struct GUID *oc_guid,
775 const struct dsdb_attribute *attr)
776 {
777 int ret;
778 unsigned int i;
779 struct ldb_context *ldb = ldb_module_get_ctx(module);
780 struct ldb_dn *user_dn;
781 struct ldb_message_element *member_el;
782 /* if we have wp, we can do whatever we like */
783 if (acl_check_access_on_attribute(module,
784 mem_ctx,
785 sd,
786 sid,
787 SEC_ADS_WRITE_PROP,
788 attr) == LDB_SUCCESS) {
789 return LDB_SUCCESS;
790 }
791 /* if we are adding/deleting ourselves, check for self membership */
792 ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
793 &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
794 &user_dn);
795 if (ret != LDB_SUCCESS) {
796 return ret;
797 }
798 member_el = ldb_msg_find_element(req->op.mod.message, "member");
799 if (!member_el) {
800 return ldb_operr(ldb);
801 }
802 /* user can only remove oneself */
803 if (member_el->num_values == 0) {
804 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
805 }
806 for (i = 0; i < member_el->num_values; i++) {
807 if (strcasecmp((const char *)member_el->values[i].data,
808 ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
809 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
810 }
811 }
812 ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
813 GUID_DRS_SELF_MEMBERSHIP,
814 SEC_ADS_SELF_WRITE,
815 sid);
816 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
817 dsdb_acl_debug(sd, acl_user_token(module),
818 req->op.mod.message->dn,
819 true,
820 10);
821 }
822 return ret;
823 }
824
825 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
826 struct ldb_module *module,
827 struct ldb_request *req,
828 struct security_descriptor *sd,
829 struct dom_sid *sid,
830 const struct GUID *oc_guid,
831 bool userPassword)
832 {
833 int ret = LDB_SUCCESS;
834 unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
835 struct ldb_message_element *el;
836 struct ldb_message *msg;
837 const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
838 "unicodePwd", "dBCSPwd", NULL }, **l;
839 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
840
841 msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
842 if (msg == NULL) {
843 return ldb_module_oom(module);
844 }
845 for (l = passwordAttrs; *l != NULL; l++) {
846 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
847 continue;
848 }
849
850 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
851 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
852 ++del_attr_cnt;
853 }
854 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
855 ++add_attr_cnt;
856 }
857 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
858 ++rep_attr_cnt;
859 }
860 ldb_msg_remove_element(msg, el);
861 }
862 }
863
864 /* single deletes will be handled by the "password_hash" LDB module
865 * later in the stack, so we let it though here */
866 if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
867 talloc_free(tmp_ctx);
868 return LDB_SUCCESS;
869 }
870
871 if (ldb_request_get_control(req,
872 DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
873 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
874 * have a user password change and not a set as the message
875 * looks like. In it's value blob it contains the NT and/or LM
876 * hash of the old password specified by the user.
877 * This control is used by the SAMR and "kpasswd" password
878 * change mechanisms. */
879 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
880 GUID_DRS_USER_CHANGE_PASSWORD,
881 SEC_ADS_CONTROL_ACCESS,
882 sid);
883 }
884 else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
885 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
886 GUID_DRS_FORCE_CHANGE_PASSWORD,
887 SEC_ADS_CONTROL_ACCESS,
888 sid);
889 }
890 else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
891 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
892 GUID_DRS_USER_CHANGE_PASSWORD,
893 SEC_ADS_CONTROL_ACCESS,
894 sid);
895 /* Very strange, but we get constraint violation in this case */
896 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
897 ret = LDB_ERR_CONSTRAINT_VIOLATION;
898 }
899 }
900 if (ret != LDB_SUCCESS) {
901 dsdb_acl_debug(sd, acl_user_token(module),
902 req->op.mod.message->dn,
903 true,
904 10);
905 }
906 talloc_free(tmp_ctx);
907 return ret;
908 }
909
910 static const struct GUID *get_oc_guid_from_message(const struct dsdb_schema *schema,
911 struct ldb_message *msg)
912 {
913 struct ldb_message_element *oc_el;
914 const struct dsdb_class *object_class;
915
916 oc_el = ldb_msg_find_element(msg, "objectClass");
917 if (!oc_el) {
918 return NULL;
919 }
920
921 object_class = dsdb_get_last_structural_class(schema, oc_el);
922 if (object_class == NULL) {
923 return NULL;
924 }
925
926 return &object_class->schemaIDGUID;
927 }
928
929
930 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
931 {
932 int ret;
933 struct ldb_context *ldb = ldb_module_get_ctx(module);
934 const struct dsdb_schema *schema;
935 unsigned int i;
936 const struct GUID *guid;
937 uint32_t access_granted;
938 struct object_tree *root = NULL;
939 struct object_tree *new_node = NULL;
940 NTSTATUS status;
941 struct ldb_result *acl_res;
942 struct security_descriptor *sd;
943 struct dom_sid *sid = NULL;
944 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
945 bool userPassword = dsdb_user_password_support(module, req, req);
946 TALLOC_CTX *tmp_ctx = talloc_new(req);
947 static const char *acl_attrs[] = {
948 "nTSecurityDescriptor",
949 "objectClass",
950 "objectSid",
951 NULL
952 };
953
954 if (as_system != NULL) {
955 as_system->critical = 0;
956 }
957
958 /* Don't print this debug statement if elements[0].name is going to be NULL */
959 if(req->op.mod.message->num_elements > 0)
960 {
961 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
962 }
963 if (dsdb_module_am_system(module) || as_system) {
964 return ldb_next_request(module, req);
965 }
966 if (ldb_dn_is_special(req->op.mod.message->dn)) {
967 return ldb_next_request(module, req);
968 }
969 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
970 acl_attrs,
971 DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
972 req);
973
974 if (ret != LDB_SUCCESS) {
975 goto fail;
976 }
977
978 schema = dsdb_get_schema(ldb, tmp_ctx);
979 if (!schema) {
980 ret = LDB_ERR_OPERATIONS_ERROR;
981 goto fail;
982 }
983
984 ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
985 if (ret != LDB_SUCCESS) {
986 talloc_free(tmp_ctx);
987 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
988 "acl_modify: Error retrieving security descriptor.");
989 }
990 /* Theoretically we pass the check if the object has no sd */
991 if (!sd) {
992 goto success;
993 }
994
995 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
996 if (!guid) {
997 talloc_free(tmp_ctx);
998 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
999 "acl_modify: Error retrieving object class GUID.");
1000 }
1001 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1002 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1003 &root, &new_node)) {
1004 talloc_free(tmp_ctx);
1005 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1006 "acl_modify: Error adding new node in object tree.");
1007 }
1008 for (i=0; i < req->op.mod.message->num_elements; i++){
1009 const struct dsdb_attribute *attr;
1010 attr = dsdb_attribute_by_lDAPDisplayName(schema,
1011 req->op.mod.message->elements[i].name);
1012
1013 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
1014 status = sec_access_check_ds(sd, acl_user_token(module),
1015 SEC_STD_WRITE_DAC,
1016 &access_granted,
1017 NULL,
1018 sid);
1019
1020 if (!NT_STATUS_IS_OK(status)) {
1021 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1022 "Object %s has no write dacl access\n",
1023 ldb_dn_get_linearized(req->op.mod.message->dn));
1024 dsdb_acl_debug(sd,
1025 acl_user_token(module),
1026 req->op.mod.message->dn,
1027 true,
1028 10);
1029 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1030 goto fail;
1031 }
1032 }
1033 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
1034 ret = acl_check_self_membership(tmp_ctx,
1035 module,
1036 req,
1037 sd,
1038 sid,
1039 guid,
1040 attr);
1041 if (ret != LDB_SUCCESS) {
1042 goto fail;
1043 }
1044 }
1045 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
1046 /* this one is not affected by any rights, we should let it through
1047 so that passwords_hash returns the correct error */
1048 continue;
1049 }
1050 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
1051 (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
1052 ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
1053 ret = acl_check_password_rights(tmp_ctx,
1054 module,
1055 req,
1056 sd,
1057 sid,
1058 guid,
1059 userPassword);
1060 if (ret != LDB_SUCCESS) {
1061 goto fail;
1062 }
1063 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
1064 ret = acl_check_spn(tmp_ctx,
1065 module,
1066 req,
1067 sd,
1068 sid,
1069 guid,
1070 attr);
1071 if (ret != LDB_SUCCESS) {
1072 goto fail;
1073 }
1074 } else {
1075
1076 /* This basic attribute existence check with the right errorcode
1077 * is needed since this module is the first one which requests
1078 * schema attribute information.
1079 * The complete attribute checking is done in the
1080 * "objectclass_attrs" module behind this one.
1081 */
1082 if (!attr) {
1083 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1084 req->op.mod.message->elements[i].name,
1085 ldb_dn_get_linearized(req->op.mod.message->dn));
1086 ret = LDB_ERR_NO_SUCH_ATTRIBUTE;
1087 goto fail;
1088 }
1089 if (!insert_in_object_tree(tmp_ctx,
1090 &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1091 &new_node, &new_node)) {
1092 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1093 "acl_modify: cannot add to object tree securityGUID\n");
1094 ret = LDB_ERR_OPERATIONS_ERROR;
1095 goto fail;
1096 }
1097
1098 if (!insert_in_object_tree(tmp_ctx,
1099 &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1100 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1101 "acl_modify: cannot add to object tree attributeGUID\n");
1102 ret = LDB_ERR_OPERATIONS_ERROR;
1103 goto fail;
1104 }
1105 }
1106 }
1107
1108 if (root->num_of_children > 0) {
1109 status = sec_access_check_ds(sd, acl_user_token(module),
1110 SEC_ADS_WRITE_PROP,
1111 &access_granted,
1112 root,
1113 sid);
1114
1115 if (!NT_STATUS_IS_OK(status)) {
1116 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1117 "Object %s has no write property access\n",
1118 ldb_dn_get_linearized(req->op.mod.message->dn));
1119 dsdb_acl_debug(sd,
1120 acl_user_token(module),
1121 req->op.mod.message->dn,
1122 true,
1123 10);
1124 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1125 goto fail;
1126 }
1127 }
1128
1129 success:
1130 talloc_free(tmp_ctx);
1131 return ldb_next_request(module, req);
1132 fail:
1133 talloc_free(tmp_ctx);
1134 return ret;
1135 }
1136
1137 /* similar to the modify for the time being.
1138 * We need to consider the special delete tree case, though - TODO */
1139 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1140 {
1141 int ret;
1142 struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1143 struct ldb_context *ldb;
1144 struct ldb_dn *nc_root;
1145 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1146
1147 if (as_system != NULL) {
1148 as_system->critical = 0;
1149 }
1150
1151 DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1152 if (dsdb_module_am_system(module) || as_system) {
1153 return ldb_next_request(module, req);
1154 }
1155 if (ldb_dn_is_special(req->op.del.dn)) {
1156 return ldb_next_request(module, req);
1157 }
1158
1159 ldb = ldb_module_get_ctx(module);
1160
1161 /* Make sure we aren't deleting a NC */
1162
1163 ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1164 if (ret != LDB_SUCCESS) {
1165 return ret;
1166 }
1167 if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1168 talloc_free(nc_root);
1169 DEBUG(10,("acl:deleting a NC\n"));
1170 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1171 return ldb_module_done(req, NULL, NULL,
1172 LDB_ERR_UNWILLING_TO_PERFORM);
1173 }
1174 talloc_free(nc_root);
1175
1176 /* First check if we have delete object right */
1177 ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1178 SEC_STD_DELETE, NULL, req);
1179 if (ret == LDB_SUCCESS) {
1180 return ldb_next_request(module, req);
1181 }
1182
1183 /* Nope, we don't have delete object. Lets check if we have delete
1184 * child on the parent */
1185 ret = dsdb_module_check_access_on_dn(module, req, parent,
1186 SEC_ADS_DELETE_CHILD, NULL, req);
1187 if (ret != LDB_SUCCESS) {
1188 return ret;
1189 }
1190
1191 return ldb_next_request(module, req);
1192 }
1193
1194 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1195 {
1196 int ret;
1197 struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1198 struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1199 const struct dsdb_schema *schema;
1200 struct ldb_context *ldb;
1201 struct security_descriptor *sd = NULL;
1202 struct dom_sid *sid = NULL;
1203 struct ldb_result *acl_res;
1204 const struct GUID *guid;
1205 struct ldb_dn *nc_root;
1206 struct object_tree *root = NULL;
1207 struct object_tree *new_node = NULL;
1208 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1209 TALLOC_CTX *tmp_ctx = talloc_new(req);
1210 NTSTATUS status;
1211 uint32_t access_granted;
1212 const char *rdn_name;
1213 static const char *acl_attrs[] = {
1214 "nTSecurityDescriptor",
1215 "objectClass",
1216 "objectSid",
1217 NULL
1218 };
1219
1220 if (as_system != NULL) {
1221 as_system->critical = 0;
1222 }
1223
1224 DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1225 if (dsdb_module_am_system(module) || as_system) {
1226 return ldb_next_request(module, req);
1227 }
1228 if (ldb_dn_is_special(req->op.rename.olddn)) {
1229 return ldb_next_request(module, req);
1230 }
1231
1232 ldb = ldb_module_get_ctx(module);
1233
1234 /* Make sure we aren't renaming/moving a NC */
1235
1236 ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1237 if (ret != LDB_SUCCESS) {
1238 return ret;
1239 }
1240 if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1241 talloc_free(nc_root);
1242 DEBUG(10,("acl:renaming/moving a NC\n"));
1243 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1244 return ldb_module_done(req, NULL, NULL,
1245 LDB_ERR_UNWILLING_TO_PERFORM);
1246 }
1247 talloc_free(nc_root);
1248
1249 /* Look for the parent */
1250
1251 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1252 req->op.rename.olddn, acl_attrs,
1253 DSDB_FLAG_NEXT_MODULE |
1254 DSDB_SEARCH_SHOW_RECYCLED, req);
1255 /* we sould be able to find the parent */
1256 if (ret != LDB_SUCCESS) {
1257 DEBUG(10,("acl: failed to find object %s\n",
1258 ldb_dn_get_linearized(req->op.rename.olddn)));
1259 talloc_free(tmp_ctx);
1260 return ret;
1261 }
1262
1263 schema = dsdb_get_schema(ldb, acl_res);
1264 if (!schema) {
1265 talloc_free(tmp_ctx);
1266 return ldb_operr(ldb);
1267 }
1268
1269 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1270 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1271 &root, &new_node)) {
1272 talloc_free(tmp_ctx);
1273 return ldb_operr(ldb);
1274 };
1275
1276 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1277 "name");
1278 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1279 &new_node, &new_node)) {
1280 talloc_free(tmp_ctx);
1281 return ldb_operr(ldb);
1282 };
1283
1284 rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1285 if (rdn_name == NULL) {
1286 talloc_free(tmp_ctx);
1287 return ldb_operr(ldb);
1288 }
1289 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1290 rdn_name);
1291 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1292 &new_node, &new_node)) {
1293 talloc_free(tmp_ctx);
1294 return ldb_operr(ldb);
1295 };
1296
1297 ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1298
1299 if (ret != LDB_SUCCESS) {
1300 talloc_free(tmp_ctx);
1301 return ldb_operr(ldb);
1302 }
1303 /* Theoretically we pass the check if the object has no sd */
1304 if (!sd) {
1305 talloc_free(tmp_ctx);
1306 return LDB_SUCCESS;
1307 }
1308 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1309 status = sec_access_check_ds(sd, acl_user_token(module),
1310 SEC_ADS_WRITE_PROP,
1311 &access_granted,
1312 root,
1313 sid);
1314
1315 if (!NT_STATUS_IS_OK(status)) {
1316 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1317 "Object %s has no wp on name\n",
1318 ldb_dn_get_linearized(req->op.rename.olddn));
1319 dsdb_acl_debug(sd,
1320 acl_user_token(module),
1321 req->op.rename.olddn,
1322 true,
1323 10);
1324 talloc_free(tmp_ctx);
1325 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1326 }
1327
1328 if (ldb_dn_compare(oldparent, newparent) == 0) {
1329 /* regular rename, not move, nothing more to do */
1330 talloc_free(tmp_ctx);
1331 return ldb_next_request(module, req);
1332 }
1333
1334 /* new parent should have create child */
1335 root = NULL;
1336 new_node = NULL;
1337 guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1338 if (!guid) {
1339 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1340 "acl:renamed object has no object class\n");
1341 talloc_free(tmp_ctx);
1342 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
1343 }
1344
1345 ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1346 if (ret != LDB_SUCCESS) {
1347 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1348 "acl:access_denied renaming %s",
1349 ldb_dn_get_linearized(req->op.rename.olddn));
1350 talloc_free(tmp_ctx);
1351 return ret;
1352 }
1353 /* do we have delete object on the object? */
1354
1355 status = sec_access_check_ds(sd, acl_user_token(module),
1356 SEC_STD_DELETE,
1357 &access_granted,
1358 NULL,
1359 sid);
1360
1361 if (NT_STATUS_IS_OK(status)) {
1362 talloc_free(tmp_ctx);
1363 return ldb_next_request(module, req);
1364 }
1365 /* what about delete child on the current parent */
1366 ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1367 if (ret != LDB_SUCCESS) {
1368 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1369 "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1370 talloc_free(tmp_ctx);
1371 return ldb_module_done(req, NULL, NULL, ret);
1372 }
1373
1374 talloc_free(tmp_ctx);
1375
1376 return ldb_next_request(module, req);
1377 }
1378
1379 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1380 {
1381 struct acl_context *ac;
1382 struct acl_private *data;
1383 struct ldb_result *acl_res;
1384 static const char *acl_attrs[] = {
1385 "objectClass",
1386 "nTSecurityDescriptor",
1387 "objectSid",
1388 NULL
1389 };
1390 int ret;
1391 unsigned int i;
1392
1393 ac = talloc_get_type(req->context, struct acl_context);
1394 data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1395 if (!ares) {
1396 return ldb_module_done(ac->req, NULL, NULL,
1397 LDB_ERR_OPERATIONS_ERROR);
1398 }
1399 if (ares->error != LDB_SUCCESS) {
1400 return ldb_module_done(ac->req, ares->controls,
1401 ares->response, ares->error);
1402 }
1403
1404 switch (ares->type) {
1405 case LDB_REPLY_ENTRY:
1406 if (ac->allowedAttributes
1407 || ac->allowedChildClasses
1408 || ac->allowedChildClassesEffective
1409 || ac->allowedAttributesEffective
1410 || ac->sDRightsEffective) {
1411 ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1412 acl_attrs,
1413 DSDB_FLAG_NEXT_MODULE |
1414 DSDB_SEARCH_SHOW_DELETED, req);
1415 if (ret != LDB_SUCCESS) {
1416 return ldb_module_done(ac->req, NULL, NULL, ret);
1417 }
1418 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1419 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1420 if (ret != LDB_SUCCESS) {
1421 return ldb_module_done(ac->req, NULL, NULL, ret);
1422 }
1423 }
1424 if (ac->allowedChildClasses) {
1425 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1426 ares->message, "allowedChildClasses");
1427 if (ret != LDB_SUCCESS) {
1428 return ldb_module_done(ac->req, NULL, NULL, ret);
1429 }
1430 }
1431 if (ac->allowedChildClassesEffective) {
1432 ret = acl_childClassesEffective(ac->module, ac->schema,
1433 acl_res->msgs[0], ares->message, ac);
1434 if (ret != LDB_SUCCESS) {
1435 return ldb_module_done(ac->req, NULL, NULL, ret);
1436 }
1437 }
1438 if (ac->sDRightsEffective) {
1439 ret = acl_sDRightsEffective(ac->module,
1440 acl_res->msgs[0], ares->message, ac);
1441 if (ret != LDB_SUCCESS) {
1442 return ldb_module_done(ac->req, NULL, NULL, ret);
1443 }
1444 }
1445 }
1446 if (data && data->password_attrs) {
1447 if (!ac->am_system) {
1448 for (i = 0; data->password_attrs[i]; i++) {
1449 if ((!ac->userPassword) &&
1450 (ldb_attr_cmp(data->password_attrs[i],
1451 "userPassword") == 0))
1452 continue;
1453
1454 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1455 }
1456 }
1457 }
1458 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1459
1460 case LDB_REPLY_REFERRAL:
1461 return ldb_module_send_referral(ac->req, ares->referral);
1462
1463 case LDB_REPLY_DONE:
1464 return ldb_module_done(ac->req, ares->controls,
1465 ares->response, LDB_SUCCESS);
1466
1467 }
1468 return LDB_SUCCESS;
1469 }
1470
1471 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1472 {
1473 struct ldb_context *ldb;
1474 struct acl_context *ac;
1475 struct ldb_request *down_req;
1476 struct acl_private *data;
1477 int ret;
1478 unsigned int i;
1479
1480 ldb = ldb_module_get_ctx(module);
1481
1482 ac = talloc_zero(req, struct acl_context);
1483 if (ac == NULL) {
1484 return ldb_oom(ldb);
1485 }
1486 data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1487
1488 ac->module = module;
1489 ac->req = req;
1490 ac->am_system = dsdb_module_am_system(module);
1491 ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1492 ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1493 ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1494 ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1495 ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1496 ac->userPassword = dsdb_user_password_support(module, ac, req);
1497 ac->schema = dsdb_get_schema(ldb, ac);
1498
1499 /* replace any attributes in the parse tree that are private,
1500 so we don't allow a search for 'userPassword=penguin',
1501 just as we would not allow that attribute to be returned */
1502 if (!ac->am_system) {
1503 /* FIXME: We should copy the tree and keep the original unmodified. */
1504 /* remove password attributes */
1505 if (data && data->password_attrs) {
1506 for (i = 0; data->password_attrs[i]; i++) {
1507 if ((!ac->userPassword) &&
1508 (ldb_attr_cmp(data->password_attrs[i],
1509 "userPassword") == 0))
1510 continue;
1511
1512 ldb_parse_tree_attr_replace(req->op.search.tree,
1513 data->password_attrs[i],
1514 "kludgeACLredactedattribute");
1515 }
1516 }
1517 }
1518 ret = ldb_build_search_req_ex(&down_req,
1519 ldb, ac,
1520 req->op.search.base,
1521 req->op.search.scope,
1522 req->op.search.tree,
1523 req->op.search.attrs,
1524 req->controls,
1525 ac, acl_search_callback,
1526 req);
1527 LDB_REQ_SET_LOCATION(down_req);
1528 if (ret != LDB_SUCCESS) {
1529 return ret;
1530 }
1531 /* perform the search */
1532 return ldb_next_request(module, down_req);
1533 }
1534
1535 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1536 {
1537 struct ldb_context *ldb = ldb_module_get_ctx(module);
1538 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1539
1540 /* allow everybody to read the sequence number */
1541 if (strcmp(req->op.extended.oid,
1542 LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1543 return ldb_next_request(module, req);
1544 }
1545
1546 if (dsdb_module_am_system(module) ||
1547 dsdb_module_am_administrator(module) || as_system) {
1548 return ldb_next_request(module, req);
1549 } else {
1550 ldb_asprintf_errstring(ldb,
1551 "acl_extended: "
1552 "attempted database modify not permitted. "
1553 "User %s is not SYSTEM or an administrator",
1554 acl_user_name(req, module));
1555 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1556 }
1557 }
1558
1559 static const struct ldb_module_ops ldb_acl_module_ops = {
1560 .name = "acl",
1561 .search = acl_search,
1562 .add = acl_add,
1563 .modify = acl_modify,
1564 .del = acl_delete,
1565 .rename = acl_rename,
1566 .extended = acl_extended,
1567 .init_context = acl_module_init
1568 };
1569
1570 int ldb_acl_module_init(const char *version)
1571 {
1572 LDB_MODULE_CHECK_VERSION(version);
1573 return ldb_register_module(&ldb_acl_module_ops);
1574 }
WIP