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s4-ldb_modules/acl: Use ntds_guid for SPN check only we have a DC object
[Samba.git] / source4 / dsdb / samdb / ldb_modules / acl.c
bloba96ea374a755954f7b054e90543bc406e587afc1
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_childClassesEffective(struct ldb_module *module,
291 const struct dsdb_schema *schema,
292 struct ldb_message *sd_msg,
293 struct ldb_message *msg,
294 struct acl_context *ac)
295 {
296 struct ldb_message_element *oc_el;
297 struct ldb_message_element *allowedClasses = NULL;
298 const struct dsdb_class *sclass;
299 struct security_descriptor *sd;
300 struct ldb_control *as_system = ldb_request_get_control(ac->req,
301 LDB_CONTROL_AS_SYSTEM_OID);
302 struct dom_sid *sid = NULL;
303 unsigned int i, j;
304 int ret;
305
306 if (as_system != NULL) {
307 as_system->critical = 0;
308 }
309
310 if (ac->am_system || as_system) {
311 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
312 }
313
314 /* If we don't have a schema yet, we can't do anything... */
315 if (schema == NULL) {
316 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
317 return LDB_ERR_OPERATIONS_ERROR;
318 }
319
320 /* Must remove any existing attribute, or else confusion reins */
321 ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
322
323 oc_el = ldb_msg_find_element(sd_msg, "objectClass");
324 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
325 if (ret != LDB_SUCCESS) {
326 return ret;
327 }
328
329 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
330 for (i=0; oc_el && i < oc_el->num_values; i++) {
331 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
332 if (!sclass) {
333 /* We don't know this class? what is going on? */
334 continue;
335 }
336
337 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
338 ret = acl_check_access_on_class(module,
339 schema,
340 msg,
341 sd,
342 sid,
343 SEC_ADS_CREATE_CHILD,
344 sclass->possibleInferiors[j]);
345 if (ret == LDB_SUCCESS) {
346 ldb_msg_add_string(msg, "allowedChildClassesEffective",
347 sclass->possibleInferiors[j]);
348 }
349 }
350 }
351 allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
352 if (!allowedClasses) {
353 return LDB_SUCCESS;
354 }
355
356 if (allowedClasses->num_values > 1) {
357 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
358 for (i=1 ; i < allowedClasses->num_values; i++) {
359 struct ldb_val *val1 = &allowedClasses->values[i-1];
360 struct ldb_val *val2 = &allowedClasses->values[i];
361 if (data_blob_cmp(val1, val2) == 0) {
362 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
363 allowedClasses->num_values--;
364 i--;
365 }
366 }
367 }
368 return LDB_SUCCESS;
369 }
370
371 static int acl_sDRightsEffective(struct ldb_module *module,
372 struct ldb_message *sd_msg,
373 struct ldb_message *msg,
374 struct acl_context *ac)
375 {
376 struct ldb_message_element *rightsEffective;
377 int ret;
378 struct security_descriptor *sd;
379 struct ldb_control *as_system = ldb_request_get_control(ac->req,
380 LDB_CONTROL_AS_SYSTEM_OID);
381 struct dom_sid *sid = NULL;
382 uint32_t flags = 0;
383
384 if (as_system != NULL) {
385 as_system->critical = 0;
386 }
387
388 /* Must remove any existing attribute, or else confusion reins */
389 ldb_msg_remove_attr(msg, "sDRightsEffective");
390 ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
391 if (ret != LDB_SUCCESS) {
392 return ret;
393 }
394 if (ac->am_system || as_system) {
395 flags = SECINFO_OWNER | SECINFO_GROUP | SECINFO_SACL | SECINFO_DACL;
396 }
397 else {
398 /* Get the security descriptor from the message */
399 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
400 if (ret != LDB_SUCCESS) {
401 return ret;
402 }
403 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
404 ret = acl_check_access_on_attribute(module,
405 msg,
406 sd,
407 sid,
408 SEC_STD_WRITE_OWNER,
409 NULL);
410 if (ret == LDB_SUCCESS) {
411 flags |= SECINFO_OWNER | SECINFO_GROUP;
412 }
413 ret = acl_check_access_on_attribute(module,
414 msg,
415 sd,
416 sid,
417 SEC_STD_WRITE_DAC,
418 NULL);
419 if (ret == LDB_SUCCESS) {
420 flags |= SECINFO_DACL;
421 }
422 ret = acl_check_access_on_attribute(module,
423 msg,
424 sd,
425 sid,
426 SEC_FLAG_SYSTEM_SECURITY,
427 NULL);
428 if (ret == LDB_SUCCESS) {
429 flags |= SECINFO_SACL;
430 }
431 }
432 return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
433 "sDRightsEffective", flags);
434 }
435
436 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
437 struct ldb_context *ldb,
438 const char *spn_value,
439 int userAccountControl,
440 const char *samAccountName,
441 const char *dnsHostName,
442 const char *netbios_name,
443 const char *ntds_guid)
444 {
445 int ret;
446 krb5_context krb_ctx;
447 krb5_error_code kerr;
448 krb5_principal principal;
449 char *instanceName;
450 char *serviceType;
451 char *serviceName;
452 const char *realm;
453 const char *forest_name = samdb_forest_name(ldb, mem_ctx);
454 const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
455 struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
456 struct loadparm_context);
457 bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
458 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
459
460 kerr = smb_krb5_init_context_basic(mem_ctx,
461 lp_ctx,
462 &krb_ctx);
463 if (kerr != 0) {
464 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
465 "Could not initialize kerberos context.");
466 }
467
468 ret = krb5_parse_name(krb_ctx, spn_value, &principal);
469 if (ret) {
470 krb5_free_context(krb_ctx);
471 return LDB_ERR_CONSTRAINT_VIOLATION;
472 }
473
474 instanceName = principal->name.name_string.val[1];
475 serviceType = principal->name.name_string.val[0];
476 realm = krb5_principal_get_realm(krb_ctx, principal);
477 if (principal->name.name_string.len == 3) {
478 serviceName = principal->name.name_string.val[2];
479 } else {
480 serviceName = NULL;
481 }
482
483 if (serviceName) {
484 if (!is_dc) {
485 goto fail;
486 }
487 if (strcasecmp(serviceType, "ldap") == 0) {
488 if (strcasecmp(serviceName, netbios_name) != 0 &&
489 strcasecmp(serviceName, forest_name) != 0) {
490 goto fail;
491 }
492
493 } else if (strcasecmp(serviceType, "gc") == 0) {
494 if (strcasecmp(serviceName, forest_name) != 0) {
495 goto fail;
496 }
497 } else {
498 if (strcasecmp(serviceName, base_domain) != 0 &&
499 strcasecmp(serviceName, netbios_name) != 0) {
500 goto fail;
501 }
502 }
503 }
504 /* instanceName can be samAccountName without $ or dnsHostName
505 * or "ntds_guid._msdcs.forest_domain for DC objects */
506 if (strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
507 goto success;
508 } else if (strcasecmp(instanceName, dnsHostName) == 0) {
509 goto success;
510 } else if (is_dc) {
511 const char *guid_str;
512 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
513 ntds_guid,
514 forest_name);
515 if (strcasecmp(instanceName, guid_str) == 0) {
516 goto success;
517 }
518 }
519
520 fail:
521 krb5_free_principal(krb_ctx, principal);
522 krb5_free_context(krb_ctx);
523 return LDB_ERR_CONSTRAINT_VIOLATION;
524
525 success:
526 krb5_free_principal(krb_ctx, principal);
527 krb5_free_context(krb_ctx);
528 return LDB_SUCCESS;
529 }
530
531 static int acl_check_spn(TALLOC_CTX *mem_ctx,
532 struct ldb_module *module,
533 struct ldb_request *req,
534 struct security_descriptor *sd,
535 struct dom_sid *sid,
536 const struct GUID *oc_guid,
537 const struct dsdb_attribute *attr)
538 {
539 int ret;
540 unsigned int i;
541 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
542 struct ldb_context *ldb = ldb_module_get_ctx(module);
543 struct ldb_result *acl_res;
544 struct ldb_result *netbios_res;
545 struct ldb_message_element *el;
546 struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
547 int userAccountControl;
548 const char *samAccountName;
549 const char *dnsHostName;
550 const char *netbios_name;
551 struct GUID ntds;
552 char *ntds_guid = NULL;
553
554 static const char *acl_attrs[] = {
555 "samAccountName",
556 "dnsHostName",
557 "userAccountControl",
558 NULL
559 };
560 static const char *netbios_attrs[] = {
561 "nETBIOSName",
562 NULL
563 };
564
565 /* if we have wp, we can do whatever we like */
566 if (acl_check_access_on_attribute(module,
567 tmp_ctx,
568 sd,
569 sid,
570 SEC_ADS_WRITE_PROP,
571 attr) == LDB_SUCCESS) {
572 talloc_free(tmp_ctx);
573 return LDB_SUCCESS;
574 }
575
576 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
577 GUID_DRS_VALIDATE_SPN,
578 SEC_ADS_SELF_WRITE,
579 sid);
580
581 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
582 dsdb_acl_debug(sd, acl_user_token(module),
583 req->op.mod.message->dn,
584 true,
585 10);
586 talloc_free(tmp_ctx);
587 return ret;
588 }
589
590 ret = dsdb_module_search_dn(module, tmp_ctx,
591 &acl_res, req->op.mod.message->dn,
592 acl_attrs,
593 DSDB_FLAG_NEXT_MODULE |
594 DSDB_SEARCH_SHOW_DELETED, req);
595 if (ret != LDB_SUCCESS) {
596 talloc_free(tmp_ctx);
597 return ret;
598 }
599
600 userAccountControl = ldb_msg_find_attr_as_int(acl_res->msgs[0], "userAccountControl", 0);
601 dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
602 samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
603
604 ret = dsdb_module_search(module, tmp_ctx,
605 &netbios_res, partitions_dn,
606 LDB_SCOPE_ONELEVEL,
607 netbios_attrs,
608 DSDB_FLAG_NEXT_MODULE,
609 req,
610 "(ncName=%s)",
611 ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
612
613 netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
614
615 el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
616 if (!el) {
617 talloc_free(tmp_ctx);
618 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
619 "Error finding element for servicePrincipalName.");
620 }
621
622 /* NTDSDSA objectGuid of object we are checking SPN for */
623 if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
624 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
625 req->op.mod.message->dn, &ntds, req);
626 if (ret != LDB_SUCCESS) {
627 ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
628 ldb_dn_get_linearized(req->op.mod.message->dn),
629 ldb_strerror(ret));
630 talloc_free(tmp_ctx);
631 return LDB_ERR_OPERATIONS_ERROR;
632 }
633 ntds_guid = GUID_string(tmp_ctx, &ntds);
634 }
635
636 for (i=0; i < el->num_values; i++) {
637 ret = acl_validate_spn_value(tmp_ctx,
638 ldb,
639 (char *)el->values[i].data,
640 userAccountControl,
641 samAccountName,
642 dnsHostName,
643 netbios_name,
644 ntds_guid);
645 if (ret != LDB_SUCCESS) {
646 talloc_free(tmp_ctx);
647 return ret;
648 }
649 }
650 talloc_free(tmp_ctx);
651 return LDB_SUCCESS;
652 }
653
654 static int acl_add(struct ldb_module *module, struct ldb_request *req)
655 {
656 int ret;
657 struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
658 struct ldb_context *ldb;
659 const struct dsdb_schema *schema;
660 struct ldb_message_element *oc_el;
661 const struct GUID *guid;
662 struct ldb_dn *nc_root;
663 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
664
665 if (as_system != NULL) {
666 as_system->critical = 0;
667 }
668
669 if (dsdb_module_am_system(module) || as_system) {
670 return ldb_next_request(module, req);
671 }
672 if (ldb_dn_is_special(req->op.add.message->dn)) {
673 return ldb_next_request(module, req);
674 }
675
676 ldb = ldb_module_get_ctx(module);
677
678 /* Creating an NC. There is probably something we should do here,
679 * but we will establish that later */
680
681 ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
682 if (ret != LDB_SUCCESS) {
683 return ret;
684 }
685 if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
686 talloc_free(nc_root);
687 return ldb_next_request(module, req);
688 }
689 talloc_free(nc_root);
690
691 schema = dsdb_get_schema(ldb, req);
692 if (!schema) {
693 return ldb_operr(ldb);
694 }
695
696 oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
697 if (!oc_el || oc_el->num_values == 0) {
698 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
699 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
700 }
701
702 guid = class_schemaid_guid_by_lDAPDisplayName(schema,
703 (char *)oc_el->values[oc_el->num_values-1].data);
704 ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
705 if (ret != LDB_SUCCESS) {
706 return ret;
707 }
708 return ldb_next_request(module, req);
709 }
710
711 /* ckecks if modifications are allowed on "Member" attribute */
712 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
713 struct ldb_module *module,
714 struct ldb_request *req,
715 struct security_descriptor *sd,
716 struct dom_sid *sid,
717 const struct GUID *oc_guid,
718 const struct dsdb_attribute *attr)
719 {
720 int ret;
721 unsigned int i;
722 struct ldb_context *ldb = ldb_module_get_ctx(module);
723 struct ldb_dn *user_dn;
724 struct ldb_message_element *member_el;
725 /* if we have wp, we can do whatever we like */
726 if (acl_check_access_on_attribute(module,
727 mem_ctx,
728 sd,
729 sid,
730 SEC_ADS_WRITE_PROP,
731 attr) == LDB_SUCCESS) {
732 return LDB_SUCCESS;
733 }
734 /* if we are adding/deleting ourselves, check for self membership */
735 ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
736 &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
737 &user_dn);
738 if (ret != LDB_SUCCESS) {
739 return ret;
740 }
741 member_el = ldb_msg_find_element(req->op.mod.message, "member");
742 if (!member_el) {
743 return ldb_operr(ldb);
744 }
745 /* user can only remove oneself */
746 if (member_el->num_values == 0) {
747 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
748 }
749 for (i = 0; i < member_el->num_values; i++) {
750 if (strcasecmp((const char *)member_el->values[i].data,
751 ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
752 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
753 }
754 }
755 ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
756 GUID_DRS_SELF_MEMBERSHIP,
757 SEC_ADS_SELF_WRITE,
758 sid);
759 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
760 dsdb_acl_debug(sd, acl_user_token(module),
761 req->op.mod.message->dn,
762 true,
763 10);
764 }
765 return ret;
766 }
767
768 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
769 struct ldb_module *module,
770 struct ldb_request *req,
771 struct security_descriptor *sd,
772 struct dom_sid *sid,
773 const struct GUID *oc_guid,
774 bool userPassword)
775 {
776 int ret = LDB_SUCCESS;
777 unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
778 struct ldb_message_element *el;
779 struct ldb_message *msg;
780 const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
781 "unicodePwd", "dBCSPwd", NULL }, **l;
782 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
783
784 msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
785 if (msg == NULL) {
786 return ldb_module_oom(module);
787 }
788 for (l = passwordAttrs; *l != NULL; l++) {
789 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
790 continue;
791 }
792
793 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
794 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
795 ++del_attr_cnt;
796 }
797 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
798 ++add_attr_cnt;
799 }
800 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
801 ++rep_attr_cnt;
802 }
803 ldb_msg_remove_element(msg, el);
804 }
805 }
806
807 /* single deletes will be handled by the "password_hash" LDB module
808 * later in the stack, so we let it though here */
809 if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
810 talloc_free(tmp_ctx);
811 return LDB_SUCCESS;
812 }
813
814 if (ldb_request_get_control(req,
815 DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
816 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
817 * have a user password change and not a set as the message
818 * looks like. In it's value blob it contains the NT and/or LM
819 * hash of the old password specified by the user.
820 * This control is used by the SAMR and "kpasswd" password
821 * change mechanisms. */
822 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
823 GUID_DRS_USER_CHANGE_PASSWORD,
824 SEC_ADS_CONTROL_ACCESS,
825 sid);
826 }
827 else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
828 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
829 GUID_DRS_FORCE_CHANGE_PASSWORD,
830 SEC_ADS_CONTROL_ACCESS,
831 sid);
832 }
833 else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
834 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
835 GUID_DRS_USER_CHANGE_PASSWORD,
836 SEC_ADS_CONTROL_ACCESS,
837 sid);
838 /* Very strange, but we get constraint violation in this case */
839 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
840 ret = LDB_ERR_CONSTRAINT_VIOLATION;
841 }
842 }
843 if (ret != LDB_SUCCESS) {
844 dsdb_acl_debug(sd, acl_user_token(module),
845 req->op.mod.message->dn,
846 true,
847 10);
848 }
849 talloc_free(tmp_ctx);
850 return ret;
851 }
852
853 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
854 {
855 int ret;
856 struct ldb_context *ldb = ldb_module_get_ctx(module);
857 const struct dsdb_schema *schema;
858 unsigned int i;
859 const struct GUID *guid;
860 uint32_t access_granted;
861 struct object_tree *root = NULL;
862 struct object_tree *new_node = NULL;
863 NTSTATUS status;
864 struct ldb_result *acl_res;
865 struct security_descriptor *sd;
866 struct dom_sid *sid = NULL;
867 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
868 bool userPassword = dsdb_user_password_support(module, req, req);
869 TALLOC_CTX *tmp_ctx = talloc_new(req);
870 static const char *acl_attrs[] = {
871 "nTSecurityDescriptor",
872 "objectClass",
873 "objectSid",
874 NULL
875 };
876
877 if (as_system != NULL) {
878 as_system->critical = 0;
879 }
880
881 /* Don't print this debug statement if elements[0].name is going to be NULL */
882 if(req->op.mod.message->num_elements > 0)
883 {
884 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
885 }
886 if (dsdb_module_am_system(module) || as_system) {
887 return ldb_next_request(module, req);
888 }
889 if (ldb_dn_is_special(req->op.mod.message->dn)) {
890 return ldb_next_request(module, req);
891 }
892 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
893 acl_attrs,
894 DSDB_FLAG_NEXT_MODULE, req);
895
896 if (ret != LDB_SUCCESS) {
897 goto fail;
898 }
899
900 schema = dsdb_get_schema(ldb, tmp_ctx);
901 if (!schema) {
902 ret = LDB_ERR_OPERATIONS_ERROR;
903 goto fail;
904 }
905
906 ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
907 if (ret != LDB_SUCCESS) {
908 talloc_free(tmp_ctx);
909 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
910 "acl_modify: Error retrieving security descriptor.");
911 }
912 /* Theoretically we pass the check if the object has no sd */
913 if (!sd) {
914 goto success;
915 }
916
917 guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
918 if (!guid) {
919 talloc_free(tmp_ctx);
920 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
921 "acl_modify: Error retrieving object class GUID.");
922 }
923 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
924 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
925 &root, &new_node)) {
926 talloc_free(tmp_ctx);
927 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
928 "acl_modify: Error adding new node in object tree.");
929 }
930 for (i=0; i < req->op.mod.message->num_elements; i++){
931 const struct dsdb_attribute *attr;
932 attr = dsdb_attribute_by_lDAPDisplayName(schema,
933 req->op.mod.message->elements[i].name);
934
935 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
936 status = sec_access_check_ds(sd, acl_user_token(module),
937 SEC_STD_WRITE_DAC,
938 &access_granted,
939 NULL,
940 sid);
941
942 if (!NT_STATUS_IS_OK(status)) {
943 DEBUG(10, ("Object %s has no write dacl access\n",
944 ldb_dn_get_linearized(req->op.mod.message->dn)));
945 dsdb_acl_debug(sd,
946 acl_user_token(module),
947 req->op.mod.message->dn,
948 true,
949 10);
950 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
951 goto fail;
952 }
953 }
954 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
955 ret = acl_check_self_membership(tmp_ctx,
956 module,
957 req,
958 sd,
959 sid,
960 guid,
961 attr);
962 if (ret != LDB_SUCCESS) {
963 goto fail;
964 }
965 }
966 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
967 /* this one is not affected by any rights, we should let it through
968 so that passwords_hash returns the correct error */
969 continue;
970 }
971 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
972 (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
973 ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
974 ret = acl_check_password_rights(tmp_ctx,
975 module,
976 req,
977 sd,
978 sid,
979 guid,
980 userPassword);
981 if (ret != LDB_SUCCESS) {
982 goto fail;
983 }
984 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
985 ret = acl_check_spn(tmp_ctx,
986 module,
987 req,
988 sd,
989 sid,
990 guid,
991 attr);
992 if (ret != LDB_SUCCESS) {
993 goto fail;
994 }
995 } else {
996
997 /* This basic attribute existence check with the right errorcode
998 * is needed since this module is the first one which requests
999 * schema attribute informations.
1000 * The complete attribute checking is done in the
1001 * "objectclass_attrs" module behind this one.
1002 */
1003 if (!attr) {
1004 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1005 req->op.mod.message->elements[i].name,
1006 ldb_dn_get_linearized(req->op.mod.message->dn));
1007 ret = LDB_ERR_NO_SUCH_ATTRIBUTE;
1008 goto fail;
1009 }
1010 if (!insert_in_object_tree(tmp_ctx,
1011 &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1012 &new_node, &new_node)) {
1013 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
1014 ret = LDB_ERR_OPERATIONS_ERROR;
1015 goto fail;
1016 }
1017
1018 if (!insert_in_object_tree(tmp_ctx,
1019 &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1020 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
1021 ret = LDB_ERR_OPERATIONS_ERROR;
1022 goto fail;
1023 }
1024 }
1025 }
1026
1027 if (root->num_of_children > 0) {
1028 status = sec_access_check_ds(sd, acl_user_token(module),
1029 SEC_ADS_WRITE_PROP,
1030 &access_granted,
1031 root,
1032 sid);
1033
1034 if (!NT_STATUS_IS_OK(status)) {
1035 DEBUG(10, ("Object %s has no write property access\n",
1036 ldb_dn_get_linearized(req->op.mod.message->dn)));
1037 dsdb_acl_debug(sd,
1038 acl_user_token(module),
1039 req->op.mod.message->dn,
1040 true,
1041 10);
1042 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1043 goto fail;
1044 }
1045 }
1046
1047 success:
1048 talloc_free(tmp_ctx);
1049 return ldb_next_request(module, req);
1050 fail:
1051 talloc_free(tmp_ctx);
1052 return ret;
1053 }
1054
1055 /* similar to the modify for the time being.
1056 * We need to consider the special delete tree case, though - TODO */
1057 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1058 {
1059 int ret;
1060 struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1061 struct ldb_context *ldb;
1062 struct ldb_dn *nc_root;
1063 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1064
1065 if (as_system != NULL) {
1066 as_system->critical = 0;
1067 }
1068
1069 DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1070 if (dsdb_module_am_system(module) || as_system) {
1071 return ldb_next_request(module, req);
1072 }
1073 if (ldb_dn_is_special(req->op.del.dn)) {
1074 return ldb_next_request(module, req);
1075 }
1076
1077 ldb = ldb_module_get_ctx(module);
1078
1079 /* Make sure we aren't deleting a NC */
1080
1081 ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1082 if (ret != LDB_SUCCESS) {
1083 return ret;
1084 }
1085 if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1086 talloc_free(nc_root);
1087 DEBUG(10,("acl:deleting a NC\n"));
1088 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1089 return ldb_module_done(req, NULL, NULL,
1090 LDB_ERR_UNWILLING_TO_PERFORM);
1091 }
1092 talloc_free(nc_root);
1093
1094 /* First check if we have delete object right */
1095 ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1096 SEC_STD_DELETE, NULL, req);
1097 if (ret == LDB_SUCCESS) {
1098 return ldb_next_request(module, req);
1099 }
1100
1101 /* Nope, we don't have delete object. Lets check if we have delete
1102 * child on the parent */
1103 ret = dsdb_module_check_access_on_dn(module, req, parent,
1104 SEC_ADS_DELETE_CHILD, NULL, req);
1105 if (ret != LDB_SUCCESS) {
1106 return ret;
1107 }
1108
1109 return ldb_next_request(module, req);
1110 }
1111
1112 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1113 {
1114 int ret;
1115 struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1116 struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1117 const struct dsdb_schema *schema;
1118 struct ldb_context *ldb;
1119 struct security_descriptor *sd = NULL;
1120 struct dom_sid *sid = NULL;
1121 struct ldb_result *acl_res;
1122 const struct GUID *guid;
1123 struct ldb_dn *nc_root;
1124 struct object_tree *root = NULL;
1125 struct object_tree *new_node = NULL;
1126 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1127 TALLOC_CTX *tmp_ctx = talloc_new(req);
1128 NTSTATUS status;
1129 uint32_t access_granted;
1130 const char *rdn_name;
1131 static const char *acl_attrs[] = {
1132 "nTSecurityDescriptor",
1133 "objectClass",
1134 "objectSid",
1135 NULL
1136 };
1137
1138 if (as_system != NULL) {
1139 as_system->critical = 0;
1140 }
1141
1142 DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1143 if (dsdb_module_am_system(module) || as_system) {
1144 return ldb_next_request(module, req);
1145 }
1146 if (ldb_dn_is_special(req->op.rename.olddn)) {
1147 return ldb_next_request(module, req);
1148 }
1149
1150 ldb = ldb_module_get_ctx(module);
1151
1152 /* Make sure we aren't renaming/moving a NC */
1153
1154 ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1155 if (ret != LDB_SUCCESS) {
1156 return ret;
1157 }
1158 if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1159 talloc_free(nc_root);
1160 DEBUG(10,("acl:renaming/moving a NC\n"));
1161 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1162 return ldb_module_done(req, NULL, NULL,
1163 LDB_ERR_UNWILLING_TO_PERFORM);
1164 }
1165 talloc_free(nc_root);
1166
1167 /* Look for the parent */
1168
1169 ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1170 req->op.rename.olddn, acl_attrs,
1171 DSDB_FLAG_NEXT_MODULE |
1172 DSDB_SEARCH_SHOW_RECYCLED, req);
1173 /* we sould be able to find the parent */
1174 if (ret != LDB_SUCCESS) {
1175 DEBUG(10,("acl: failed to find object %s\n",
1176 ldb_dn_get_linearized(req->op.rename.olddn)));
1177 talloc_free(tmp_ctx);
1178 return ret;
1179 }
1180
1181 schema = dsdb_get_schema(ldb, acl_res);
1182 if (!schema) {
1183 talloc_free(tmp_ctx);
1184 return ldb_operr(ldb);
1185 }
1186
1187 guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1188 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1189 &root, &new_node)) {
1190 talloc_free(tmp_ctx);
1191 return ldb_operr(ldb);
1192 };
1193
1194 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1195 "name");
1196 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1197 &new_node, &new_node)) {
1198 talloc_free(tmp_ctx);
1199 return ldb_operr(ldb);
1200 };
1201
1202 rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1203 if (rdn_name == NULL) {
1204 talloc_free(tmp_ctx);
1205 return ldb_operr(ldb);
1206 }
1207 guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1208 rdn_name);
1209 if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1210 &new_node, &new_node)) {
1211 talloc_free(tmp_ctx);
1212 return ldb_operr(ldb);
1213 };
1214
1215 ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1216
1217 if (ret != LDB_SUCCESS) {
1218 talloc_free(tmp_ctx);
1219 return ldb_operr(ldb);
1220 }
1221 /* Theoretically we pass the check if the object has no sd */
1222 if (!sd) {
1223 talloc_free(tmp_ctx);
1224 return LDB_SUCCESS;
1225 }
1226 sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1227 status = sec_access_check_ds(sd, acl_user_token(module),
1228 SEC_ADS_WRITE_PROP,
1229 &access_granted,
1230 root,
1231 sid);
1232
1233 if (!NT_STATUS_IS_OK(status)) {
1234 DEBUG(10, ("Object %s has no wp on name\n",
1235 ldb_dn_get_linearized(req->op.rename.olddn)));
1236 dsdb_acl_debug(sd,
1237 acl_user_token(module),
1238 req->op.rename.olddn,
1239 true,
1240 10);
1241 talloc_free(tmp_ctx);
1242 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1243 }
1244
1245 if (ldb_dn_compare(oldparent, newparent) == 0) {
1246 /* regular rename, not move, nothing more to do */
1247 talloc_free(tmp_ctx);
1248 return ldb_next_request(module, req);
1249 }
1250
1251 /* new parent should have create child */
1252 root = NULL;
1253 new_node = NULL;
1254 guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1255 if (!guid) {
1256 DEBUG(10,("acl:renamed object has no object class\n"));
1257 talloc_free(tmp_ctx);
1258 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
1259 }
1260
1261 ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1262 if (ret != LDB_SUCCESS) {
1263 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1264 talloc_free(tmp_ctx);
1265 return ret;
1266 }
1267 /* do we have delete object on the object? */
1268
1269 status = sec_access_check_ds(sd, acl_user_token(module),
1270 SEC_STD_DELETE,
1271 &access_granted,
1272 NULL,
1273 sid);
1274
1275 if (NT_STATUS_IS_OK(status)) {
1276 talloc_free(tmp_ctx);
1277 return ldb_next_request(module, req);
1278 }
1279 /* what about delete child on the current parent */
1280 ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1281 if (ret != LDB_SUCCESS) {
1282 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1283 talloc_free(tmp_ctx);
1284 return ldb_module_done(req, NULL, NULL, ret);
1285 }
1286
1287 talloc_free(tmp_ctx);
1288
1289 return ldb_next_request(module, req);
1290 }
1291
1292 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1293 {
1294 struct ldb_context *ldb;
1295 struct acl_context *ac;
1296 struct acl_private *data;
1297 struct ldb_result *acl_res;
1298 static const char *acl_attrs[] = {
1299 "objectClass",
1300 "nTSecurityDescriptor",
1301 "objectSid",
1302 NULL
1303 };
1304 int ret;
1305 unsigned int i;
1306
1307 ac = talloc_get_type(req->context, struct acl_context);
1308 data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1309 ldb = ldb_module_get_ctx(ac->module);
1310
1311 if (!ares) {
1312 return ldb_module_done(ac->req, NULL, NULL,
1313 LDB_ERR_OPERATIONS_ERROR);
1314 }
1315 if (ares->error != LDB_SUCCESS) {
1316 return ldb_module_done(ac->req, ares->controls,
1317 ares->response, ares->error);
1318 }
1319
1320 switch (ares->type) {
1321 case LDB_REPLY_ENTRY:
1322 if (ac->allowedAttributes
1323 || ac->allowedChildClasses
1324 || ac->allowedChildClassesEffective
1325 || ac->allowedAttributesEffective
1326 || ac->sDRightsEffective) {
1327 ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1328 acl_attrs,
1329 DSDB_FLAG_NEXT_MODULE, req);
1330 if (ret != LDB_SUCCESS) {
1331 return ldb_module_done(ac->req, NULL, NULL, ret);
1332 }
1333 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1334 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1335 if (ret != LDB_SUCCESS) {
1336 return ldb_module_done(ac->req, NULL, NULL, ret);
1337 }
1338 }
1339 if (ac->allowedChildClasses) {
1340 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1341 ares->message, "allowedChildClasses");
1342 if (ret != LDB_SUCCESS) {
1343 return ldb_module_done(ac->req, NULL, NULL, ret);
1344 }
1345 }
1346 if (ac->allowedChildClassesEffective) {
1347 ret = acl_childClassesEffective(ac->module, ac->schema,
1348 acl_res->msgs[0], ares->message, ac);
1349 if (ret != LDB_SUCCESS) {
1350 return ldb_module_done(ac->req, NULL, NULL, ret);
1351 }
1352 }
1353 if (ac->sDRightsEffective) {
1354 ret = acl_sDRightsEffective(ac->module,
1355 acl_res->msgs[0], ares->message, ac);
1356 if (ret != LDB_SUCCESS) {
1357 return ldb_module_done(ac->req, NULL, NULL, ret);
1358 }
1359 }
1360 }
1361 if (data && data->password_attrs) {
1362 if (!ac->am_system) {
1363 for (i = 0; data->password_attrs[i]; i++) {
1364 if ((!ac->userPassword) &&
1365 (ldb_attr_cmp(data->password_attrs[i],
1366 "userPassword") == 0))
1367 continue;
1368
1369 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1370 }
1371 }
1372 }
1373 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1374
1375 case LDB_REPLY_REFERRAL:
1376 return ldb_module_send_referral(ac->req, ares->referral);
1377
1378 case LDB_REPLY_DONE:
1379 return ldb_module_done(ac->req, ares->controls,
1380 ares->response, LDB_SUCCESS);
1381
1382 }
1383 return LDB_SUCCESS;
1384 }
1385
1386 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1387 {
1388 struct ldb_context *ldb;
1389 struct acl_context *ac;
1390 struct ldb_request *down_req;
1391 struct acl_private *data;
1392 int ret;
1393 unsigned int i;
1394
1395 ldb = ldb_module_get_ctx(module);
1396
1397 ac = talloc_zero(req, struct acl_context);
1398 if (ac == NULL) {
1399 return ldb_oom(ldb);
1400 }
1401 data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1402
1403 ac->module = module;
1404 ac->req = req;
1405 ac->am_system = dsdb_module_am_system(module);
1406 ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1407 ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1408 ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1409 ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1410 ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1411 ac->userPassword = dsdb_user_password_support(module, ac, req);
1412 ac->schema = dsdb_get_schema(ldb, ac);
1413
1414 /* replace any attributes in the parse tree that are private,
1415 so we don't allow a search for 'userPassword=penguin',
1416 just as we would not allow that attribute to be returned */
1417 if (ac->am_system) {
1418 /* FIXME: We should copy the tree and keep the original unmodified. */
1419 /* remove password attributes */
1420 if (data && data->password_attrs) {
1421 for (i = 0; data->password_attrs[i]; i++) {
1422 if ((!ac->userPassword) &&
1423 (ldb_attr_cmp(data->password_attrs[i],
1424 "userPassword") == 0))
1425 continue;
1426
1427 ldb_parse_tree_attr_replace(req->op.search.tree,
1428 data->password_attrs[i],
1429 "kludgeACLredactedattribute");
1430 }
1431 }
1432 }
1433 ret = ldb_build_search_req_ex(&down_req,
1434 ldb, ac,
1435 req->op.search.base,
1436 req->op.search.scope,
1437 req->op.search.tree,
1438 req->op.search.attrs,
1439 req->controls,
1440 ac, acl_search_callback,
1441 req);
1442 LDB_REQ_SET_LOCATION(down_req);
1443 if (ret != LDB_SUCCESS) {
1444 return ret;
1445 }
1446 /* perform the search */
1447 return ldb_next_request(module, down_req);
1448 }
1449
1450 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1451 {
1452 struct ldb_context *ldb = ldb_module_get_ctx(module);
1453 struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1454
1455 /* allow everybody to read the sequence number */
1456 if (strcmp(req->op.extended.oid,
1457 LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1458 return ldb_next_request(module, req);
1459 }
1460
1461 if (dsdb_module_am_system(module) ||
1462 dsdb_module_am_administrator(module) || as_system) {
1463 return ldb_next_request(module, req);
1464 } else {
1465 ldb_asprintf_errstring(ldb,
1466 "acl_extended: "
1467 "attempted database modify not permitted. "
1468 "User %s is not SYSTEM or an administrator",
1469 acl_user_name(req, module));
1470 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1471 }
1472 }
1473
1474 static const struct ldb_module_ops ldb_acl_module_ops = {
1475 .name = "acl",
1476 .search = acl_search,
1477 .add = acl_add,
1478 .modify = acl_modify,
1479 .del = acl_delete,
1480 .rename = acl_rename,
1481 .extended = acl_extended,
1482 .init_context = acl_module_init
1483 };
1484
1485 int ldb_acl_module_init(const char *version)
1486 {
1487 LDB_MODULE_CHECK_VERSION(version);
1488 return ldb_register_module(&ldb_acl_module_ops);
1489 }
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