s4-dsdb Return ACL errors as ldb_errstring()
[amitay/samba.git] / source4 / dsdb / samdb / ldb_modules / acl.c
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                                   uint32_t 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         if (strcasecmp_m(spn_value, samAccountName) == 0) {
461                 /* MacOS X sets this value, and setting an SPN of your
462                  * own samAccountName is both pointless and safe */
463                 return LDB_SUCCESS;
464         }
465
466         kerr = smb_krb5_init_context_basic(mem_ctx,
467                                            lp_ctx,
468                                            &krb_ctx);
469         if (kerr != 0) {
470                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
471                                  "Could not initialize kerberos context.");
472         }
473
474         ret = krb5_parse_name(krb_ctx, spn_value, &principal);
475         if (ret) {
476                 krb5_free_context(krb_ctx);
477                 return LDB_ERR_CONSTRAINT_VIOLATION;
478         }
479
480         if (principal->name.name_string.len < 2) {
481                 goto fail;
482         }
483
484         instanceName = principal->name.name_string.val[1];
485         serviceType = principal->name.name_string.val[0];
486         realm = krb5_principal_get_realm(krb_ctx, principal);
487         if (principal->name.name_string.len == 3) {
488                 serviceName = principal->name.name_string.val[2];
489         } else {
490                 serviceName = NULL;
491         }
492
493         if (serviceName) {
494                 if (!is_dc) {
495                         goto fail;
496                 }
497                 if (strcasecmp(serviceType, "ldap") == 0) {
498                         if (strcasecmp(serviceName, netbios_name) != 0 &&
499                             strcasecmp(serviceName, forest_name) != 0) {
500                                 goto fail;
501                         }
502
503                 } else if (strcasecmp(serviceType, "gc") == 0) {
504                         if (strcasecmp(serviceName, forest_name) != 0) {
505                                 goto fail;
506                         }
507                 } else {
508                         if (strcasecmp(serviceName, base_domain) != 0 &&
509                             strcasecmp(serviceName, netbios_name) != 0) {
510                                 goto fail;
511                         }
512                 }
513         }
514         /* instanceName can be samAccountName without $ or dnsHostName
515          * or "ntds_guid._msdcs.forest_domain for DC objects */
516         if (strlen(instanceName) == (strlen(samAccountName) - 1)
517             && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
518                 goto success;
519         } else if (strcasecmp(instanceName, dnsHostName) == 0) {
520                 goto success;
521         } else if (is_dc) {
522                 const char *guid_str;
523                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
524                                            ntds_guid,
525                                            forest_name);
526                 if (strcasecmp(instanceName, guid_str) == 0) {
527                         goto success;
528                 }
529         }
530
531 fail:
532         krb5_free_principal(krb_ctx, principal);
533         krb5_free_context(krb_ctx);
534         return LDB_ERR_CONSTRAINT_VIOLATION;
535
536 success:
537         krb5_free_principal(krb_ctx, principal);
538         krb5_free_context(krb_ctx);
539         return LDB_SUCCESS;
540 }
541
542 static int acl_check_spn(TALLOC_CTX *mem_ctx,
543                          struct ldb_module *module,
544                          struct ldb_request *req,
545                          struct security_descriptor *sd,
546                          struct dom_sid *sid,
547                          const struct GUID *oc_guid,
548                          const struct dsdb_attribute *attr)
549 {
550         int ret;
551         unsigned int i;
552         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
553         struct ldb_context *ldb = ldb_module_get_ctx(module);
554         struct ldb_result *acl_res;
555         struct ldb_result *netbios_res;
556         struct ldb_message_element *el;
557         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
558         uint32_t userAccountControl;
559         const char *samAccountName;
560         const char *dnsHostName;
561         const char *netbios_name;
562         struct GUID ntds;
563         char *ntds_guid = NULL;
564
565         static const char *acl_attrs[] = {
566                 "samAccountName",
567                 "dnsHostName",
568                 "userAccountControl",
569                 NULL
570         };
571         static const char *netbios_attrs[] = {
572                 "nETBIOSName",
573                 NULL
574         };
575
576         /* if we have wp, we can do whatever we like */
577         if (acl_check_access_on_attribute(module,
578                                           tmp_ctx,
579                                           sd,
580                                           sid,
581                                           SEC_ADS_WRITE_PROP,
582                                           attr) == LDB_SUCCESS) {
583                 talloc_free(tmp_ctx);
584                 return LDB_SUCCESS;
585         }
586
587         ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
588                                        GUID_DRS_VALIDATE_SPN,
589                                        SEC_ADS_SELF_WRITE,
590                                        sid);
591
592         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
593                 dsdb_acl_debug(sd, acl_user_token(module),
594                                req->op.mod.message->dn,
595                                true,
596                                10);
597                 talloc_free(tmp_ctx);
598                 return ret;
599         }
600
601         ret = dsdb_module_search_dn(module, tmp_ctx,
602                                     &acl_res, req->op.mod.message->dn,
603                                     acl_attrs,
604                                     DSDB_FLAG_NEXT_MODULE |
605                                     DSDB_SEARCH_SHOW_DELETED, req);
606         if (ret != LDB_SUCCESS) {
607                 talloc_free(tmp_ctx);
608                 return ret;
609         }
610
611         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
612         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
613         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
614
615         ret = dsdb_module_search(module, tmp_ctx,
616                                  &netbios_res, partitions_dn,
617                                  LDB_SCOPE_ONELEVEL,
618                                  netbios_attrs,
619                                  DSDB_FLAG_NEXT_MODULE,
620                                  req,
621                                  "(ncName=%s)",
622                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
623
624         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
625
626         el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
627         if (!el) {
628                 talloc_free(tmp_ctx);
629                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
630                                          "Error finding element for servicePrincipalName.");
631         }
632
633         /* NTDSDSA objectGuid of object we are checking SPN for */
634         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
635                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
636                                                              req->op.mod.message->dn, &ntds, req);
637                 if (ret != LDB_SUCCESS) {
638                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
639                                                ldb_dn_get_linearized(req->op.mod.message->dn),
640                                                ldb_strerror(ret));
641                         talloc_free(tmp_ctx);
642                         return LDB_ERR_OPERATIONS_ERROR;
643                 }
644                 ntds_guid = GUID_string(tmp_ctx, &ntds);
645         }
646
647         for (i=0; i < el->num_values; i++) {
648                 ret = acl_validate_spn_value(tmp_ctx,
649                                              ldb,
650                                              (char *)el->values[i].data,
651                                              userAccountControl,
652                                              samAccountName,
653                                              dnsHostName,
654                                              netbios_name,
655                                              ntds_guid);
656                 if (ret != LDB_SUCCESS) {
657                         talloc_free(tmp_ctx);
658                         return ret;
659                 }
660         }
661         talloc_free(tmp_ctx);
662         return LDB_SUCCESS;
663 }
664
665 static int acl_add(struct ldb_module *module, struct ldb_request *req)
666 {
667         int ret;
668         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
669         struct ldb_context *ldb;
670         const struct dsdb_schema *schema;
671         struct ldb_message_element *oc_el;
672         const struct GUID *guid;
673         struct ldb_dn *nc_root;
674         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
675
676         if (as_system != NULL) {
677                 as_system->critical = 0;
678         }
679
680         if (dsdb_module_am_system(module) || as_system) {
681                 return ldb_next_request(module, req);
682         }
683         if (ldb_dn_is_special(req->op.add.message->dn)) {
684                 return ldb_next_request(module, req);
685         }
686
687         ldb = ldb_module_get_ctx(module);
688
689         /* Creating an NC. There is probably something we should do here,
690          * but we will establish that later */
691
692         ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
693         if (ret != LDB_SUCCESS) {
694                 return ret;
695         }
696         if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
697                 talloc_free(nc_root);
698                 return ldb_next_request(module, req);
699         }
700         talloc_free(nc_root);
701
702         schema = dsdb_get_schema(ldb, req);
703         if (!schema) {
704                 return ldb_operr(ldb);
705         }
706
707         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
708         if (!oc_el || oc_el->num_values == 0) {
709                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
710                                        "acl: unable to find objectClass on %s\n",
711                                        ldb_dn_get_linearized(req->op.add.message->dn));
712                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
713         }
714
715         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
716                                                       (char *)oc_el->values[oc_el->num_values-1].data);
717         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
718         if (ret != LDB_SUCCESS) {
719                 return ret;
720         }
721         return ldb_next_request(module, req);
722 }
723
724 /* ckecks if modifications are allowed on "Member" attribute */
725 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
726                                      struct ldb_module *module,
727                                      struct ldb_request *req,
728                                      struct security_descriptor *sd,
729                                      struct dom_sid *sid,
730                                      const struct GUID *oc_guid,
731                                      const struct dsdb_attribute *attr)
732 {
733         int ret;
734         unsigned int i;
735         struct ldb_context *ldb = ldb_module_get_ctx(module);
736         struct ldb_dn *user_dn;
737         struct ldb_message_element *member_el;
738         /* if we have wp, we can do whatever we like */
739         if (acl_check_access_on_attribute(module,
740                                           mem_ctx,
741                                           sd,
742                                           sid,
743                                           SEC_ADS_WRITE_PROP,
744                                           attr) == LDB_SUCCESS) {
745                 return LDB_SUCCESS;
746         }
747         /* if we are adding/deleting ourselves, check for self membership */
748         ret = dsdb_find_dn_by_sid(ldb, mem_ctx, 
749                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX], 
750                                   &user_dn);
751         if (ret != LDB_SUCCESS) {
752                 return ret;
753         }
754         member_el = ldb_msg_find_element(req->op.mod.message, "member");
755         if (!member_el) {
756                 return ldb_operr(ldb);
757         }
758         /* user can only remove oneself */
759         if (member_el->num_values == 0) {
760                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
761         }
762         for (i = 0; i < member_el->num_values; i++) {
763                 if (strcasecmp((const char *)member_el->values[i].data,
764                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
765                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
766                 }
767         }
768         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
769                                        GUID_DRS_SELF_MEMBERSHIP,
770                                        SEC_ADS_SELF_WRITE,
771                                        sid);
772         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
773                 dsdb_acl_debug(sd, acl_user_token(module),
774                                req->op.mod.message->dn,
775                                true,
776                                10);
777         }
778         return ret;
779 }
780
781 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
782                                      struct ldb_module *module,
783                                      struct ldb_request *req,
784                                      struct security_descriptor *sd,
785                                      struct dom_sid *sid,
786                                      const struct GUID *oc_guid,
787                                      bool userPassword)
788 {
789         int ret = LDB_SUCCESS;
790         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
791         struct ldb_message_element *el;
792         struct ldb_message *msg;
793         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
794                                         "unicodePwd", "dBCSPwd", NULL }, **l;
795         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
796
797         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
798         if (msg == NULL) {
799                 return ldb_module_oom(module);
800         }
801         for (l = passwordAttrs; *l != NULL; l++) {
802                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
803                         continue;
804                 }
805
806                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
807                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
808                                 ++del_attr_cnt;
809                         }
810                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
811                                 ++add_attr_cnt;
812                         }
813                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
814                                 ++rep_attr_cnt;
815                         }
816                         ldb_msg_remove_element(msg, el);
817                 }
818         }
819
820         /* single deletes will be handled by the "password_hash" LDB module
821          * later in the stack, so we let it though here */
822         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
823                 talloc_free(tmp_ctx);
824                 return LDB_SUCCESS;
825         }
826
827         if (ldb_request_get_control(req,
828                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
829                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
830                  * have a user password change and not a set as the message
831                  * looks like. In it's value blob it contains the NT and/or LM
832                  * hash of the old password specified by the user.
833                  * This control is used by the SAMR and "kpasswd" password
834                  * change mechanisms. */
835                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
836                                                GUID_DRS_USER_CHANGE_PASSWORD,
837                                                SEC_ADS_CONTROL_ACCESS,
838                                                sid);
839         }
840         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
841                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
842                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
843                                                SEC_ADS_CONTROL_ACCESS,
844                                                sid);
845         }
846         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
847                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
848                                                GUID_DRS_USER_CHANGE_PASSWORD,
849                                                SEC_ADS_CONTROL_ACCESS,
850                                                sid);
851                 /* Very strange, but we get constraint violation in this case */
852                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
853                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
854                 }
855         }
856         if (ret != LDB_SUCCESS) {
857                 dsdb_acl_debug(sd, acl_user_token(module),
858                                req->op.mod.message->dn,
859                                true,
860                                10);
861         }
862         talloc_free(tmp_ctx);
863         return ret;
864 }
865
866 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
867 {
868         int ret;
869         struct ldb_context *ldb = ldb_module_get_ctx(module);
870         const struct dsdb_schema *schema;
871         unsigned int i;
872         const struct GUID *guid;
873         uint32_t access_granted;
874         struct object_tree *root = NULL;
875         struct object_tree *new_node = NULL;
876         NTSTATUS status;
877         struct ldb_result *acl_res;
878         struct security_descriptor *sd;
879         struct dom_sid *sid = NULL;
880         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
881         bool userPassword = dsdb_user_password_support(module, req, req);
882         TALLOC_CTX *tmp_ctx = talloc_new(req);
883         static const char *acl_attrs[] = {
884                 "nTSecurityDescriptor",
885                 "objectClass",
886                 "objectSid",
887                 NULL
888         };
889
890         if (as_system != NULL) {
891                 as_system->critical = 0;
892         }
893
894         /* Don't print this debug statement if elements[0].name is going to be NULL */
895         if(req->op.mod.message->num_elements > 0)
896         {
897                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
898         }
899         if (dsdb_module_am_system(module) || as_system) {
900                 return ldb_next_request(module, req);
901         }
902         if (ldb_dn_is_special(req->op.mod.message->dn)) {
903                 return ldb_next_request(module, req);
904         }
905         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
906                                     acl_attrs,
907                                     DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
908                                     req);
909
910         if (ret != LDB_SUCCESS) {
911                 goto fail;
912         }
913
914         schema = dsdb_get_schema(ldb, tmp_ctx);
915         if (!schema) {
916                 ret = LDB_ERR_OPERATIONS_ERROR;
917                 goto fail;
918         }
919
920         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
921         if (ret != LDB_SUCCESS) {
922                 talloc_free(tmp_ctx);
923                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
924                                  "acl_modify: Error retrieving security descriptor.");
925         }
926         /* Theoretically we pass the check if the object has no sd */
927         if (!sd) {
928                 goto success;
929         }
930
931         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
932         if (!guid) {
933                 talloc_free(tmp_ctx);
934                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
935                                  "acl_modify: Error retrieving object class GUID.");
936         }
937         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
938         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
939                                    &root, &new_node)) {
940                 talloc_free(tmp_ctx);
941                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
942                                  "acl_modify: Error adding new node in object tree.");
943         }
944         for (i=0; i < req->op.mod.message->num_elements; i++){
945                 const struct dsdb_attribute *attr;
946                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
947                                                          req->op.mod.message->elements[i].name);
948
949                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
950                         status = sec_access_check_ds(sd, acl_user_token(module),
951                                              SEC_STD_WRITE_DAC,
952                                              &access_granted,
953                                              NULL,
954                                              sid);
955
956                         if (!NT_STATUS_IS_OK(status)) {
957                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
958                                                        "Object %s has no write dacl access\n",
959                                                        ldb_dn_get_linearized(req->op.mod.message->dn));
960                                 dsdb_acl_debug(sd,
961                                                acl_user_token(module),
962                                                req->op.mod.message->dn,
963                                                true,
964                                                10);
965                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
966                                 goto fail;
967                         }
968                 }
969                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
970                         ret = acl_check_self_membership(tmp_ctx,
971                                                         module,
972                                                         req,
973                                                         sd,
974                                                         sid,
975                                                         guid,
976                                                         attr);
977                         if (ret != LDB_SUCCESS) {
978                                 goto fail;
979                         }
980                 }
981                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
982                         /* this one is not affected by any rights, we should let it through
983                            so that passwords_hash returns the correct error */
984                         continue;
985                 }
986                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
987                          (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
988                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
989                         ret = acl_check_password_rights(tmp_ctx,
990                                                         module,
991                                                         req,
992                                                         sd,
993                                                         sid,
994                                                         guid,
995                                                         userPassword);
996                         if (ret != LDB_SUCCESS) {
997                                 goto fail;
998                         }
999                 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
1000                         ret = acl_check_spn(tmp_ctx,
1001                                             module,
1002                                             req,
1003                                             sd,
1004                                             sid,
1005                                             guid,
1006                                             attr);
1007                         if (ret != LDB_SUCCESS) {
1008                                 goto fail;
1009                         }
1010                 } else {
1011
1012                 /* This basic attribute existence check with the right errorcode
1013                  * is needed since this module is the first one which requests
1014                  * schema attribute information.
1015                  * The complete attribute checking is done in the
1016                  * "objectclass_attrs" module behind this one.
1017                  */
1018                         if (!attr) {
1019                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1020                                                        req->op.mod.message->elements[i].name,
1021                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1022                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1023                                 goto fail;
1024                         }
1025                         if (!insert_in_object_tree(tmp_ctx,
1026                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1027                                                    &new_node, &new_node)) {
1028                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1029                                                        "acl_modify: cannot add to object tree securityGUID\n");
1030                                 ret = LDB_ERR_OPERATIONS_ERROR;
1031                                 goto fail;
1032                         }
1033
1034                         if (!insert_in_object_tree(tmp_ctx,
1035                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1036                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1037                                                        "acl_modify: cannot add to object tree attributeGUID\n");
1038                                 ret = LDB_ERR_OPERATIONS_ERROR;
1039                                 goto fail;
1040                         }
1041                 }
1042         }
1043
1044         if (root->num_of_children > 0) {
1045                 status = sec_access_check_ds(sd, acl_user_token(module),
1046                                              SEC_ADS_WRITE_PROP,
1047                                              &access_granted,
1048                                              root,
1049                                              sid);
1050
1051                 if (!NT_STATUS_IS_OK(status)) {
1052                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
1053                                                "Object %s has no write property access\n",
1054                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1055                         dsdb_acl_debug(sd,
1056                                        acl_user_token(module),
1057                                        req->op.mod.message->dn,
1058                                        true,
1059                                        10);
1060                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1061                         goto fail;
1062                 }
1063         }
1064
1065 success:
1066         talloc_free(tmp_ctx);
1067         return ldb_next_request(module, req);
1068 fail:
1069         talloc_free(tmp_ctx);
1070         return ret;
1071 }
1072
1073 /* similar to the modify for the time being.
1074  * We need to consider the special delete tree case, though - TODO */
1075 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1076 {
1077         int ret;
1078         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1079         struct ldb_context *ldb;
1080         struct ldb_dn *nc_root;
1081         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1082
1083         if (as_system != NULL) {
1084                 as_system->critical = 0;
1085         }
1086
1087         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1088         if (dsdb_module_am_system(module) || as_system) {
1089                 return ldb_next_request(module, req);
1090         }
1091         if (ldb_dn_is_special(req->op.del.dn)) {
1092                 return ldb_next_request(module, req);
1093         }
1094
1095         ldb = ldb_module_get_ctx(module);
1096
1097         /* Make sure we aren't deleting a NC */
1098
1099         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1100         if (ret != LDB_SUCCESS) {
1101                 return ret;
1102         }
1103         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1104                 talloc_free(nc_root);
1105                 DEBUG(10,("acl:deleting a NC\n"));
1106                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1107                 return ldb_module_done(req, NULL, NULL,
1108                                        LDB_ERR_UNWILLING_TO_PERFORM);
1109         }
1110         talloc_free(nc_root);
1111
1112         /* First check if we have delete object right */
1113         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1114                                              SEC_STD_DELETE, NULL, req);
1115         if (ret == LDB_SUCCESS) {
1116                 return ldb_next_request(module, req);
1117         }
1118
1119         /* Nope, we don't have delete object. Lets check if we have delete
1120          * child on the parent */
1121         ret = dsdb_module_check_access_on_dn(module, req, parent,
1122                                              SEC_ADS_DELETE_CHILD, NULL, req);
1123         if (ret != LDB_SUCCESS) {
1124                 return ret;
1125         }
1126
1127         return ldb_next_request(module, req);
1128 }
1129
1130 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1131 {
1132         int ret;
1133         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1134         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1135         const struct dsdb_schema *schema;
1136         struct ldb_context *ldb;
1137         struct security_descriptor *sd = NULL;
1138         struct dom_sid *sid = NULL;
1139         struct ldb_result *acl_res;
1140         const struct GUID *guid;
1141         struct ldb_dn *nc_root;
1142         struct object_tree *root = NULL;
1143         struct object_tree *new_node = NULL;
1144         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1145         TALLOC_CTX *tmp_ctx = talloc_new(req);
1146         NTSTATUS status;
1147         uint32_t access_granted;
1148         const char *rdn_name;
1149         static const char *acl_attrs[] = {
1150                 "nTSecurityDescriptor",
1151                 "objectClass",
1152                 "objectSid",
1153                 NULL
1154         };
1155
1156         if (as_system != NULL) {
1157                 as_system->critical = 0;
1158         }
1159
1160         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1161         if (dsdb_module_am_system(module) || as_system) {
1162                 return ldb_next_request(module, req);
1163         }
1164         if (ldb_dn_is_special(req->op.rename.olddn)) {
1165                 return ldb_next_request(module, req);
1166         }
1167
1168         ldb = ldb_module_get_ctx(module);
1169
1170         /* Make sure we aren't renaming/moving a NC */
1171
1172         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1173         if (ret != LDB_SUCCESS) {
1174                 return ret;
1175         }
1176         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1177                 talloc_free(nc_root);
1178                 DEBUG(10,("acl:renaming/moving a NC\n"));
1179                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1180                 return ldb_module_done(req, NULL, NULL,
1181                                        LDB_ERR_UNWILLING_TO_PERFORM);
1182         }
1183         talloc_free(nc_root);
1184
1185         /* Look for the parent */
1186
1187         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1188                                     req->op.rename.olddn, acl_attrs,
1189                                     DSDB_FLAG_NEXT_MODULE |
1190                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1191         /* we sould be able to find the parent */
1192         if (ret != LDB_SUCCESS) {
1193                 DEBUG(10,("acl: failed to find object %s\n",
1194                           ldb_dn_get_linearized(req->op.rename.olddn)));
1195                 talloc_free(tmp_ctx);
1196                 return ret;
1197         }
1198
1199         schema = dsdb_get_schema(ldb, acl_res);
1200         if (!schema) {
1201                 talloc_free(tmp_ctx);
1202                 return ldb_operr(ldb);
1203         }
1204
1205         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1206         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1207                                    &root, &new_node)) {
1208                 talloc_free(tmp_ctx);
1209                 return ldb_operr(ldb);
1210         };
1211
1212         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1213                                                           "name");
1214         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1215                                    &new_node, &new_node)) {
1216                 talloc_free(tmp_ctx);
1217                 return ldb_operr(ldb);
1218         };
1219
1220         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1221         if (rdn_name == NULL) {
1222                 talloc_free(tmp_ctx);
1223                 return ldb_operr(ldb);
1224         }
1225         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1226                                                           rdn_name);
1227         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1228                                    &new_node, &new_node)) {
1229                 talloc_free(tmp_ctx);
1230                 return ldb_operr(ldb);
1231         };
1232
1233         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1234
1235         if (ret != LDB_SUCCESS) {
1236                 talloc_free(tmp_ctx);
1237                 return ldb_operr(ldb);
1238         }
1239         /* Theoretically we pass the check if the object has no sd */
1240         if (!sd) {
1241                 talloc_free(tmp_ctx);
1242                 return LDB_SUCCESS;
1243         }
1244         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1245         status = sec_access_check_ds(sd, acl_user_token(module),
1246                                      SEC_ADS_WRITE_PROP,
1247                                      &access_granted,
1248                                      root,
1249                                      sid);
1250
1251         if (!NT_STATUS_IS_OK(status)) {
1252                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1253                                        "Object %s has no wp on name\n",
1254                                        ldb_dn_get_linearized(req->op.rename.olddn));
1255                 dsdb_acl_debug(sd,
1256                           acl_user_token(module),
1257                           req->op.rename.olddn,
1258                           true,
1259                           10);
1260                 talloc_free(tmp_ctx);
1261                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1262         }
1263
1264         if (ldb_dn_compare(oldparent, newparent) == 0) {
1265                 /* regular rename, not move, nothing more to do */
1266                 talloc_free(tmp_ctx);
1267                 return ldb_next_request(module, req);
1268         }
1269
1270         /* new parent should have create child */
1271         root = NULL;
1272         new_node = NULL;
1273         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1274         if (!guid) {
1275                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1276                                        "acl:renamed object has no object class\n");
1277                 talloc_free(tmp_ctx);
1278                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1279         }
1280
1281         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1282         if (ret != LDB_SUCCESS) {
1283                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1284                                        "acl:access_denied renaming %s",
1285                                        ldb_dn_get_linearized(req->op.rename.olddn));
1286                 talloc_free(tmp_ctx);
1287                 return ret;
1288         }
1289         /* do we have delete object on the object? */
1290
1291         status = sec_access_check_ds(sd, acl_user_token(module),
1292                                      SEC_STD_DELETE,
1293                                      &access_granted,
1294                                      NULL,
1295                                      sid);
1296
1297         if (NT_STATUS_IS_OK(status)) {
1298                 talloc_free(tmp_ctx);
1299                 return ldb_next_request(module, req);
1300         }
1301         /* what about delete child on the current parent */
1302         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1303         if (ret != LDB_SUCCESS) {
1304                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1305                                        "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1306                 talloc_free(tmp_ctx);
1307                 return ldb_module_done(req, NULL, NULL, ret);
1308         }
1309
1310         talloc_free(tmp_ctx);
1311
1312         return ldb_next_request(module, req);
1313 }
1314
1315 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1316 {
1317         struct ldb_context *ldb;
1318         struct acl_context *ac;
1319         struct acl_private *data;
1320         struct ldb_result *acl_res;
1321         static const char *acl_attrs[] = {
1322                 "objectClass",
1323                 "nTSecurityDescriptor",
1324                 "objectSid",
1325                 NULL
1326         };
1327         int ret;
1328         unsigned int i;
1329
1330         ac = talloc_get_type(req->context, struct acl_context);
1331         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1332         ldb = ldb_module_get_ctx(ac->module);
1333
1334         if (!ares) {
1335                 return ldb_module_done(ac->req, NULL, NULL,
1336                                        LDB_ERR_OPERATIONS_ERROR);
1337         }
1338         if (ares->error != LDB_SUCCESS) {
1339                 return ldb_module_done(ac->req, ares->controls,
1340                                        ares->response, ares->error);
1341         }
1342
1343         switch (ares->type) {
1344         case LDB_REPLY_ENTRY:
1345                 if (ac->allowedAttributes 
1346                     || ac->allowedChildClasses
1347                     || ac->allowedChildClassesEffective
1348                     || ac->allowedAttributesEffective
1349                     || ac->sDRightsEffective) {
1350                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn, 
1351                                                     acl_attrs,
1352                                                     DSDB_FLAG_NEXT_MODULE |
1353                                                     DSDB_SEARCH_SHOW_DELETED, req);
1354                         if (ret != LDB_SUCCESS) {
1355                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1356                         }
1357                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1358                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1359                                 if (ret != LDB_SUCCESS) {
1360                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1361                                 }
1362                         }
1363                         if (ac->allowedChildClasses) {
1364                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1365                                                        ares->message, "allowedChildClasses");
1366                                 if (ret != LDB_SUCCESS) {
1367                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1368                                 }
1369                         }
1370                         if (ac->allowedChildClassesEffective) {
1371                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1372                                                                 acl_res->msgs[0], ares->message, ac);
1373                                 if (ret != LDB_SUCCESS) {
1374                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1375                                 }
1376                         }
1377                         if (ac->sDRightsEffective) {
1378                                 ret = acl_sDRightsEffective(ac->module, 
1379                                                             acl_res->msgs[0], ares->message, ac);
1380                                 if (ret != LDB_SUCCESS) {
1381                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1382                                 }
1383                         }
1384                 }
1385                 if (data && data->password_attrs) {
1386                         if (!ac->am_system) {
1387                                 for (i = 0; data->password_attrs[i]; i++) {
1388                                         if ((!ac->userPassword) &&
1389                                             (ldb_attr_cmp(data->password_attrs[i],
1390                                                           "userPassword") == 0))
1391                                                 continue;
1392
1393                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1394                                 }
1395                         }
1396                 }
1397                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1398
1399         case LDB_REPLY_REFERRAL:
1400                 return ldb_module_send_referral(ac->req, ares->referral);
1401
1402         case LDB_REPLY_DONE:
1403                 return ldb_module_done(ac->req, ares->controls,
1404                                        ares->response, LDB_SUCCESS);
1405
1406         }
1407         return LDB_SUCCESS;
1408 }
1409
1410 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1411 {
1412         struct ldb_context *ldb;
1413         struct acl_context *ac;
1414         struct ldb_request *down_req;
1415         struct acl_private *data;
1416         int ret;
1417         unsigned int i;
1418
1419         ldb = ldb_module_get_ctx(module);
1420
1421         ac = talloc_zero(req, struct acl_context);
1422         if (ac == NULL) {
1423                 return ldb_oom(ldb);
1424         }
1425         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1426
1427         ac->module = module;
1428         ac->req = req;
1429         ac->am_system = dsdb_module_am_system(module);
1430         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1431         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1432         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1433         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1434         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1435         ac->userPassword = dsdb_user_password_support(module, ac, req);
1436         ac->schema = dsdb_get_schema(ldb, ac);
1437
1438         /* replace any attributes in the parse tree that are private,
1439            so we don't allow a search for 'userPassword=penguin',
1440            just as we would not allow that attribute to be returned */
1441         if (ac->am_system) {
1442                 /* FIXME: We should copy the tree and keep the original unmodified. */
1443                 /* remove password attributes */
1444                 if (data && data->password_attrs) {
1445                         for (i = 0; data->password_attrs[i]; i++) {
1446                                 if ((!ac->userPassword) &&
1447                                     (ldb_attr_cmp(data->password_attrs[i],
1448                                                   "userPassword") == 0))
1449                                                 continue;
1450
1451                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1452                                                             data->password_attrs[i],
1453                                                             "kludgeACLredactedattribute");
1454                         }
1455                 }
1456         }
1457         ret = ldb_build_search_req_ex(&down_req,
1458                                       ldb, ac,
1459                                       req->op.search.base,
1460                                       req->op.search.scope,
1461                                       req->op.search.tree,
1462                                       req->op.search.attrs,
1463                                       req->controls,
1464                                       ac, acl_search_callback,
1465                                       req);
1466         LDB_REQ_SET_LOCATION(down_req);
1467         if (ret != LDB_SUCCESS) {
1468                 return ret;
1469         }
1470         /* perform the search */
1471         return ldb_next_request(module, down_req);
1472 }
1473
1474 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1475 {
1476         struct ldb_context *ldb = ldb_module_get_ctx(module);
1477         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1478
1479         /* allow everybody to read the sequence number */
1480         if (strcmp(req->op.extended.oid,
1481                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1482                 return ldb_next_request(module, req);
1483         }
1484
1485         if (dsdb_module_am_system(module) ||
1486             dsdb_module_am_administrator(module) || as_system) {
1487                 return ldb_next_request(module, req);
1488         } else {
1489                 ldb_asprintf_errstring(ldb,
1490                                        "acl_extended: "
1491                                        "attempted database modify not permitted. "
1492                                        "User %s is not SYSTEM or an administrator",
1493                                        acl_user_name(req, module));
1494                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1495         }
1496 }
1497
1498 static const struct ldb_module_ops ldb_acl_module_ops = {
1499         .name              = "acl",
1500         .search            = acl_search,
1501         .add               = acl_add,
1502         .modify            = acl_modify,
1503         .del               = acl_delete,
1504         .rename            = acl_rename,
1505         .extended          = acl_extended,
1506         .init_context      = acl_module_init
1507 };
1508
1509 int ldb_acl_module_init(const char *version)
1510 {
1511         LDB_MODULE_CHECK_VERSION(version);
1512         return ldb_register_module(&ldb_acl_module_ops);
1513 }