12a4028cbe8ad6c11c0dc571af9737872361a62d
[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                 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
710                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
711         }
712
713         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
714                                                       (char *)oc_el->values[oc_el->num_values-1].data);
715         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
716         if (ret != LDB_SUCCESS) {
717                 return ret;
718         }
719         return ldb_next_request(module, req);
720 }
721
722 /* ckecks if modifications are allowed on "Member" attribute */
723 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
724                                      struct ldb_module *module,
725                                      struct ldb_request *req,
726                                      struct security_descriptor *sd,
727                                      struct dom_sid *sid,
728                                      const struct GUID *oc_guid,
729                                      const struct dsdb_attribute *attr)
730 {
731         int ret;
732         unsigned int i;
733         struct ldb_context *ldb = ldb_module_get_ctx(module);
734         struct ldb_dn *user_dn;
735         struct ldb_message_element *member_el;
736         /* if we have wp, we can do whatever we like */
737         if (acl_check_access_on_attribute(module,
738                                           mem_ctx,
739                                           sd,
740                                           sid,
741                                           SEC_ADS_WRITE_PROP,
742                                           attr) == LDB_SUCCESS) {
743                 return LDB_SUCCESS;
744         }
745         /* if we are adding/deleting ourselves, check for self membership */
746         ret = dsdb_find_dn_by_sid(ldb, mem_ctx, 
747                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX], 
748                                   &user_dn);
749         if (ret != LDB_SUCCESS) {
750                 return ret;
751         }
752         member_el = ldb_msg_find_element(req->op.mod.message, "member");
753         if (!member_el) {
754                 return ldb_operr(ldb);
755         }
756         /* user can only remove oneself */
757         if (member_el->num_values == 0) {
758                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
759         }
760         for (i = 0; i < member_el->num_values; i++) {
761                 if (strcasecmp((const char *)member_el->values[i].data,
762                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
763                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
764                 }
765         }
766         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
767                                        GUID_DRS_SELF_MEMBERSHIP,
768                                        SEC_ADS_SELF_WRITE,
769                                        sid);
770         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
771                 dsdb_acl_debug(sd, acl_user_token(module),
772                                req->op.mod.message->dn,
773                                true,
774                                10);
775         }
776         return ret;
777 }
778
779 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
780                                      struct ldb_module *module,
781                                      struct ldb_request *req,
782                                      struct security_descriptor *sd,
783                                      struct dom_sid *sid,
784                                      const struct GUID *oc_guid,
785                                      bool userPassword)
786 {
787         int ret = LDB_SUCCESS;
788         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
789         struct ldb_message_element *el;
790         struct ldb_message *msg;
791         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
792                                         "unicodePwd", "dBCSPwd", NULL }, **l;
793         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
794
795         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
796         if (msg == NULL) {
797                 return ldb_module_oom(module);
798         }
799         for (l = passwordAttrs; *l != NULL; l++) {
800                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
801                         continue;
802                 }
803
804                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
805                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
806                                 ++del_attr_cnt;
807                         }
808                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
809                                 ++add_attr_cnt;
810                         }
811                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
812                                 ++rep_attr_cnt;
813                         }
814                         ldb_msg_remove_element(msg, el);
815                 }
816         }
817
818         /* single deletes will be handled by the "password_hash" LDB module
819          * later in the stack, so we let it though here */
820         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
821                 talloc_free(tmp_ctx);
822                 return LDB_SUCCESS;
823         }
824
825         if (ldb_request_get_control(req,
826                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
827                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
828                  * have a user password change and not a set as the message
829                  * looks like. In it's value blob it contains the NT and/or LM
830                  * hash of the old password specified by the user.
831                  * This control is used by the SAMR and "kpasswd" password
832                  * change mechanisms. */
833                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
834                                                GUID_DRS_USER_CHANGE_PASSWORD,
835                                                SEC_ADS_CONTROL_ACCESS,
836                                                sid);
837         }
838         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
839                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
840                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
841                                                SEC_ADS_CONTROL_ACCESS,
842                                                sid);
843         }
844         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
845                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
846                                                GUID_DRS_USER_CHANGE_PASSWORD,
847                                                SEC_ADS_CONTROL_ACCESS,
848                                                sid);
849                 /* Very strange, but we get constraint violation in this case */
850                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
851                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
852                 }
853         }
854         if (ret != LDB_SUCCESS) {
855                 dsdb_acl_debug(sd, acl_user_token(module),
856                                req->op.mod.message->dn,
857                                true,
858                                10);
859         }
860         talloc_free(tmp_ctx);
861         return ret;
862 }
863
864 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
865 {
866         int ret;
867         struct ldb_context *ldb = ldb_module_get_ctx(module);
868         const struct dsdb_schema *schema;
869         unsigned int i;
870         const struct GUID *guid;
871         uint32_t access_granted;
872         struct object_tree *root = NULL;
873         struct object_tree *new_node = NULL;
874         NTSTATUS status;
875         struct ldb_result *acl_res;
876         struct security_descriptor *sd;
877         struct dom_sid *sid = NULL;
878         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
879         bool userPassword = dsdb_user_password_support(module, req, req);
880         TALLOC_CTX *tmp_ctx = talloc_new(req);
881         static const char *acl_attrs[] = {
882                 "nTSecurityDescriptor",
883                 "objectClass",
884                 "objectSid",
885                 NULL
886         };
887
888         if (as_system != NULL) {
889                 as_system->critical = 0;
890         }
891
892         /* Don't print this debug statement if elements[0].name is going to be NULL */
893         if(req->op.mod.message->num_elements > 0)
894         {
895                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
896         }
897         if (dsdb_module_am_system(module) || as_system) {
898                 return ldb_next_request(module, req);
899         }
900         if (ldb_dn_is_special(req->op.mod.message->dn)) {
901                 return ldb_next_request(module, req);
902         }
903         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
904                                     acl_attrs,
905                                     DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
906                                     req);
907
908         if (ret != LDB_SUCCESS) {
909                 goto fail;
910         }
911
912         schema = dsdb_get_schema(ldb, tmp_ctx);
913         if (!schema) {
914                 ret = LDB_ERR_OPERATIONS_ERROR;
915                 goto fail;
916         }
917
918         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
919         if (ret != LDB_SUCCESS) {
920                 talloc_free(tmp_ctx);
921                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
922                                  "acl_modify: Error retrieving security descriptor.");
923         }
924         /* Theoretically we pass the check if the object has no sd */
925         if (!sd) {
926                 goto success;
927         }
928
929         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
930         if (!guid) {
931                 talloc_free(tmp_ctx);
932                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
933                                  "acl_modify: Error retrieving object class GUID.");
934         }
935         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
936         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
937                                    &root, &new_node)) {
938                 talloc_free(tmp_ctx);
939                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
940                                  "acl_modify: Error adding new node in object tree.");
941         }
942         for (i=0; i < req->op.mod.message->num_elements; i++){
943                 const struct dsdb_attribute *attr;
944                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
945                                                          req->op.mod.message->elements[i].name);
946
947                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
948                         status = sec_access_check_ds(sd, acl_user_token(module),
949                                              SEC_STD_WRITE_DAC,
950                                              &access_granted,
951                                              NULL,
952                                              sid);
953
954                         if (!NT_STATUS_IS_OK(status)) {
955                                 DEBUG(10, ("Object %s has no write dacl access\n",
956                                            ldb_dn_get_linearized(req->op.mod.message->dn)));
957                                 dsdb_acl_debug(sd,
958                                                acl_user_token(module),
959                                                req->op.mod.message->dn,
960                                                true,
961                                                10);
962                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
963                                 goto fail;
964                         }
965                 }
966                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
967                         ret = acl_check_self_membership(tmp_ctx,
968                                                         module,
969                                                         req,
970                                                         sd,
971                                                         sid,
972                                                         guid,
973                                                         attr);
974                         if (ret != LDB_SUCCESS) {
975                                 goto fail;
976                         }
977                 }
978                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
979                         /* this one is not affected by any rights, we should let it through
980                            so that passwords_hash returns the correct error */
981                         continue;
982                 }
983                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
984                          (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
985                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
986                         ret = acl_check_password_rights(tmp_ctx,
987                                                         module,
988                                                         req,
989                                                         sd,
990                                                         sid,
991                                                         guid,
992                                                         userPassword);
993                         if (ret != LDB_SUCCESS) {
994                                 goto fail;
995                         }
996                 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
997                         ret = acl_check_spn(tmp_ctx,
998                                             module,
999                                             req,
1000                                             sd,
1001                                             sid,
1002                                             guid,
1003                                             attr);
1004                         if (ret != LDB_SUCCESS) {
1005                                 goto fail;
1006                         }
1007                 } else {
1008
1009                 /* This basic attribute existence check with the right errorcode
1010                  * is needed since this module is the first one which requests
1011                  * schema attribute information.
1012                  * The complete attribute checking is done in the
1013                  * "objectclass_attrs" module behind this one.
1014                  */
1015                         if (!attr) {
1016                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1017                                                        req->op.mod.message->elements[i].name,
1018                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1019                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1020                                 goto fail;
1021                         }
1022                         if (!insert_in_object_tree(tmp_ctx,
1023                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1024                                                    &new_node, &new_node)) {
1025                                 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
1026                                 ret = LDB_ERR_OPERATIONS_ERROR;
1027                                 goto fail;
1028                         }
1029
1030                         if (!insert_in_object_tree(tmp_ctx,
1031                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1032                                 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
1033                                 ret = LDB_ERR_OPERATIONS_ERROR;
1034                                 goto fail;
1035                         }
1036                 }
1037         }
1038
1039         if (root->num_of_children > 0) {
1040                 status = sec_access_check_ds(sd, acl_user_token(module),
1041                                              SEC_ADS_WRITE_PROP,
1042                                              &access_granted,
1043                                              root,
1044                                              sid);
1045
1046                 if (!NT_STATUS_IS_OK(status)) {
1047                         DEBUG(10, ("Object %s has no write property access\n",
1048                                    ldb_dn_get_linearized(req->op.mod.message->dn)));
1049                         dsdb_acl_debug(sd,
1050                                   acl_user_token(module),
1051                                   req->op.mod.message->dn,
1052                                   true,
1053                                   10);
1054                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1055                         goto fail;
1056                 }
1057         }
1058
1059 success:
1060         talloc_free(tmp_ctx);
1061         return ldb_next_request(module, req);
1062 fail:
1063         talloc_free(tmp_ctx);
1064         return ret;
1065 }
1066
1067 /* similar to the modify for the time being.
1068  * We need to consider the special delete tree case, though - TODO */
1069 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1070 {
1071         int ret;
1072         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1073         struct ldb_context *ldb;
1074         struct ldb_dn *nc_root;
1075         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1076
1077         if (as_system != NULL) {
1078                 as_system->critical = 0;
1079         }
1080
1081         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1082         if (dsdb_module_am_system(module) || as_system) {
1083                 return ldb_next_request(module, req);
1084         }
1085         if (ldb_dn_is_special(req->op.del.dn)) {
1086                 return ldb_next_request(module, req);
1087         }
1088
1089         ldb = ldb_module_get_ctx(module);
1090
1091         /* Make sure we aren't deleting a NC */
1092
1093         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1094         if (ret != LDB_SUCCESS) {
1095                 return ret;
1096         }
1097         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1098                 talloc_free(nc_root);
1099                 DEBUG(10,("acl:deleting a NC\n"));
1100                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1101                 return ldb_module_done(req, NULL, NULL,
1102                                        LDB_ERR_UNWILLING_TO_PERFORM);
1103         }
1104         talloc_free(nc_root);
1105
1106         /* First check if we have delete object right */
1107         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1108                                              SEC_STD_DELETE, NULL, req);
1109         if (ret == LDB_SUCCESS) {
1110                 return ldb_next_request(module, req);
1111         }
1112
1113         /* Nope, we don't have delete object. Lets check if we have delete
1114          * child on the parent */
1115         ret = dsdb_module_check_access_on_dn(module, req, parent,
1116                                              SEC_ADS_DELETE_CHILD, NULL, req);
1117         if (ret != LDB_SUCCESS) {
1118                 return ret;
1119         }
1120
1121         return ldb_next_request(module, req);
1122 }
1123
1124 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1125 {
1126         int ret;
1127         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1128         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1129         const struct dsdb_schema *schema;
1130         struct ldb_context *ldb;
1131         struct security_descriptor *sd = NULL;
1132         struct dom_sid *sid = NULL;
1133         struct ldb_result *acl_res;
1134         const struct GUID *guid;
1135         struct ldb_dn *nc_root;
1136         struct object_tree *root = NULL;
1137         struct object_tree *new_node = NULL;
1138         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1139         TALLOC_CTX *tmp_ctx = talloc_new(req);
1140         NTSTATUS status;
1141         uint32_t access_granted;
1142         const char *rdn_name;
1143         static const char *acl_attrs[] = {
1144                 "nTSecurityDescriptor",
1145                 "objectClass",
1146                 "objectSid",
1147                 NULL
1148         };
1149
1150         if (as_system != NULL) {
1151                 as_system->critical = 0;
1152         }
1153
1154         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1155         if (dsdb_module_am_system(module) || as_system) {
1156                 return ldb_next_request(module, req);
1157         }
1158         if (ldb_dn_is_special(req->op.rename.olddn)) {
1159                 return ldb_next_request(module, req);
1160         }
1161
1162         ldb = ldb_module_get_ctx(module);
1163
1164         /* Make sure we aren't renaming/moving a NC */
1165
1166         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1167         if (ret != LDB_SUCCESS) {
1168                 return ret;
1169         }
1170         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1171                 talloc_free(nc_root);
1172                 DEBUG(10,("acl:renaming/moving a NC\n"));
1173                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1174                 return ldb_module_done(req, NULL, NULL,
1175                                        LDB_ERR_UNWILLING_TO_PERFORM);
1176         }
1177         talloc_free(nc_root);
1178
1179         /* Look for the parent */
1180
1181         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1182                                     req->op.rename.olddn, acl_attrs,
1183                                     DSDB_FLAG_NEXT_MODULE |
1184                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1185         /* we sould be able to find the parent */
1186         if (ret != LDB_SUCCESS) {
1187                 DEBUG(10,("acl: failed to find object %s\n",
1188                           ldb_dn_get_linearized(req->op.rename.olddn)));
1189                 talloc_free(tmp_ctx);
1190                 return ret;
1191         }
1192
1193         schema = dsdb_get_schema(ldb, acl_res);
1194         if (!schema) {
1195                 talloc_free(tmp_ctx);
1196                 return ldb_operr(ldb);
1197         }
1198
1199         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1200         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1201                                    &root, &new_node)) {
1202                 talloc_free(tmp_ctx);
1203                 return ldb_operr(ldb);
1204         };
1205
1206         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1207                                                           "name");
1208         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1209                                    &new_node, &new_node)) {
1210                 talloc_free(tmp_ctx);
1211                 return ldb_operr(ldb);
1212         };
1213
1214         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1215         if (rdn_name == NULL) {
1216                 talloc_free(tmp_ctx);
1217                 return ldb_operr(ldb);
1218         }
1219         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1220                                                           rdn_name);
1221         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1222                                    &new_node, &new_node)) {
1223                 talloc_free(tmp_ctx);
1224                 return ldb_operr(ldb);
1225         };
1226
1227         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1228
1229         if (ret != LDB_SUCCESS) {
1230                 talloc_free(tmp_ctx);
1231                 return ldb_operr(ldb);
1232         }
1233         /* Theoretically we pass the check if the object has no sd */
1234         if (!sd) {
1235                 talloc_free(tmp_ctx);
1236                 return LDB_SUCCESS;
1237         }
1238         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1239         status = sec_access_check_ds(sd, acl_user_token(module),
1240                                      SEC_ADS_WRITE_PROP,
1241                                      &access_granted,
1242                                      root,
1243                                      sid);
1244
1245         if (!NT_STATUS_IS_OK(status)) {
1246                 DEBUG(10, ("Object %s has no wp on name\n",
1247                            ldb_dn_get_linearized(req->op.rename.olddn)));
1248                 dsdb_acl_debug(sd,
1249                           acl_user_token(module),
1250                           req->op.rename.olddn,
1251                           true,
1252                           10);
1253                 talloc_free(tmp_ctx);
1254                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1255         }
1256
1257         if (ldb_dn_compare(oldparent, newparent) == 0) {
1258                 /* regular rename, not move, nothing more to do */
1259                 talloc_free(tmp_ctx);
1260                 return ldb_next_request(module, req);
1261         }
1262
1263         /* new parent should have create child */
1264         root = NULL;
1265         new_node = NULL;
1266         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1267         if (!guid) {
1268                 DEBUG(10,("acl:renamed object has no object class\n"));
1269                 talloc_free(tmp_ctx);
1270                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1271         }
1272
1273         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1274         if (ret != LDB_SUCCESS) {
1275                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1276                 talloc_free(tmp_ctx);
1277                 return ret;
1278         }
1279         /* do we have delete object on the object? */
1280
1281         status = sec_access_check_ds(sd, acl_user_token(module),
1282                                      SEC_STD_DELETE,
1283                                      &access_granted,
1284                                      NULL,
1285                                      sid);
1286
1287         if (NT_STATUS_IS_OK(status)) {
1288                 talloc_free(tmp_ctx);
1289                 return ldb_next_request(module, req);
1290         }
1291         /* what about delete child on the current parent */
1292         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1293         if (ret != LDB_SUCCESS) {
1294                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1295                 talloc_free(tmp_ctx);
1296                 return ldb_module_done(req, NULL, NULL, ret);
1297         }
1298
1299         talloc_free(tmp_ctx);
1300
1301         return ldb_next_request(module, req);
1302 }
1303
1304 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1305 {
1306         struct ldb_context *ldb;
1307         struct acl_context *ac;
1308         struct acl_private *data;
1309         struct ldb_result *acl_res;
1310         static const char *acl_attrs[] = {
1311                 "objectClass",
1312                 "nTSecurityDescriptor",
1313                 "objectSid",
1314                 NULL
1315         };
1316         int ret;
1317         unsigned int i;
1318
1319         ac = talloc_get_type(req->context, struct acl_context);
1320         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1321         ldb = ldb_module_get_ctx(ac->module);
1322
1323         if (!ares) {
1324                 return ldb_module_done(ac->req, NULL, NULL,
1325                                        LDB_ERR_OPERATIONS_ERROR);
1326         }
1327         if (ares->error != LDB_SUCCESS) {
1328                 return ldb_module_done(ac->req, ares->controls,
1329                                        ares->response, ares->error);
1330         }
1331
1332         switch (ares->type) {
1333         case LDB_REPLY_ENTRY:
1334                 if (ac->allowedAttributes 
1335                     || ac->allowedChildClasses
1336                     || ac->allowedChildClassesEffective
1337                     || ac->allowedAttributesEffective
1338                     || ac->sDRightsEffective) {
1339                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn, 
1340                                                     acl_attrs,
1341                                                     DSDB_FLAG_NEXT_MODULE |
1342                                                     DSDB_SEARCH_SHOW_DELETED, req);
1343                         if (ret != LDB_SUCCESS) {
1344                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1345                         }
1346                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1347                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1348                                 if (ret != LDB_SUCCESS) {
1349                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1350                                 }
1351                         }
1352                         if (ac->allowedChildClasses) {
1353                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1354                                                        ares->message, "allowedChildClasses");
1355                                 if (ret != LDB_SUCCESS) {
1356                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1357                                 }
1358                         }
1359                         if (ac->allowedChildClassesEffective) {
1360                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1361                                                                 acl_res->msgs[0], ares->message, ac);
1362                                 if (ret != LDB_SUCCESS) {
1363                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1364                                 }
1365                         }
1366                         if (ac->sDRightsEffective) {
1367                                 ret = acl_sDRightsEffective(ac->module, 
1368                                                             acl_res->msgs[0], ares->message, ac);
1369                                 if (ret != LDB_SUCCESS) {
1370                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1371                                 }
1372                         }
1373                 }
1374                 if (data && data->password_attrs) {
1375                         if (!ac->am_system) {
1376                                 for (i = 0; data->password_attrs[i]; i++) {
1377                                         if ((!ac->userPassword) &&
1378                                             (ldb_attr_cmp(data->password_attrs[i],
1379                                                           "userPassword") == 0))
1380                                                 continue;
1381
1382                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1383                                 }
1384                         }
1385                 }
1386                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1387
1388         case LDB_REPLY_REFERRAL:
1389                 return ldb_module_send_referral(ac->req, ares->referral);
1390
1391         case LDB_REPLY_DONE:
1392                 return ldb_module_done(ac->req, ares->controls,
1393                                        ares->response, LDB_SUCCESS);
1394
1395         }
1396         return LDB_SUCCESS;
1397 }
1398
1399 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1400 {
1401         struct ldb_context *ldb;
1402         struct acl_context *ac;
1403         struct ldb_request *down_req;
1404         struct acl_private *data;
1405         int ret;
1406         unsigned int i;
1407
1408         ldb = ldb_module_get_ctx(module);
1409
1410         ac = talloc_zero(req, struct acl_context);
1411         if (ac == NULL) {
1412                 return ldb_oom(ldb);
1413         }
1414         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1415
1416         ac->module = module;
1417         ac->req = req;
1418         ac->am_system = dsdb_module_am_system(module);
1419         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1420         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1421         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1422         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1423         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1424         ac->userPassword = dsdb_user_password_support(module, ac, req);
1425         ac->schema = dsdb_get_schema(ldb, ac);
1426
1427         /* replace any attributes in the parse tree that are private,
1428            so we don't allow a search for 'userPassword=penguin',
1429            just as we would not allow that attribute to be returned */
1430         if (ac->am_system) {
1431                 /* FIXME: We should copy the tree and keep the original unmodified. */
1432                 /* remove password attributes */
1433                 if (data && data->password_attrs) {
1434                         for (i = 0; data->password_attrs[i]; i++) {
1435                                 if ((!ac->userPassword) &&
1436                                     (ldb_attr_cmp(data->password_attrs[i],
1437                                                   "userPassword") == 0))
1438                                                 continue;
1439
1440                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1441                                                             data->password_attrs[i],
1442                                                             "kludgeACLredactedattribute");
1443                         }
1444                 }
1445         }
1446         ret = ldb_build_search_req_ex(&down_req,
1447                                       ldb, ac,
1448                                       req->op.search.base,
1449                                       req->op.search.scope,
1450                                       req->op.search.tree,
1451                                       req->op.search.attrs,
1452                                       req->controls,
1453                                       ac, acl_search_callback,
1454                                       req);
1455         LDB_REQ_SET_LOCATION(down_req);
1456         if (ret != LDB_SUCCESS) {
1457                 return ret;
1458         }
1459         /* perform the search */
1460         return ldb_next_request(module, down_req);
1461 }
1462
1463 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1464 {
1465         struct ldb_context *ldb = ldb_module_get_ctx(module);
1466         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1467
1468         /* allow everybody to read the sequence number */
1469         if (strcmp(req->op.extended.oid,
1470                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1471                 return ldb_next_request(module, req);
1472         }
1473
1474         if (dsdb_module_am_system(module) ||
1475             dsdb_module_am_administrator(module) || as_system) {
1476                 return ldb_next_request(module, req);
1477         } else {
1478                 ldb_asprintf_errstring(ldb,
1479                                        "acl_extended: "
1480                                        "attempted database modify not permitted. "
1481                                        "User %s is not SYSTEM or an administrator",
1482                                        acl_user_name(req, module));
1483                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1484         }
1485 }
1486
1487 static const struct ldb_module_ops ldb_acl_module_ops = {
1488         .name              = "acl",
1489         .search            = acl_search,
1490         .add               = acl_add,
1491         .modify            = acl_modify,
1492         .del               = acl_delete,
1493         .rename            = acl_rename,
1494         .extended          = acl_extended,
1495         .init_context      = acl_module_init
1496 };
1497
1498 int ldb_acl_module_init(const char *version)
1499 {
1500         LDB_MODULE_CHECK_VERSION(version);
1501         return ldb_register_module(&ldb_acl_module_ops);
1502 }