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 "lib/util/tsort.h"
  43
  44 struct extended_access_check_attribute {
  45         const char *oa_name;
  46         const uint32_t requires_rights;
  47 };
  48
  49 struct acl_private {
  50         bool acl_perform;
  51         const char **password_attrs;
  52 };
  53
  54 struct acl_context {
  55         struct ldb_module *module;
  56         struct ldb_request *req;
  57         bool am_system;
  58         bool allowedAttributes;
  59         bool allowedAttributesEffective;
  60         bool allowedChildClasses;
  61         bool allowedChildClassesEffective;
  62         bool sDRightsEffective;
  63         const char * const *attrs;
  64         struct dsdb_schema *schema;
  65 };
  66
  67 static int acl_module_init(struct ldb_module *module)
  68 {
  69         struct ldb_context *ldb;
  70         struct acl_private *data;
  71         int ret, i;
  72         TALLOC_CTX *mem_ctx;
  73         static const char *attrs[] = { "passwordAttribute", NULL };
  74         struct ldb_result *res;
  75         struct ldb_message *msg;
  76         struct ldb_message_element *password_attributes;
  77
  78         ldb = ldb_module_get_ctx(module);
  79
  80         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
  81         if (ret != LDB_SUCCESS) {
  82                 ldb_debug(ldb, LDB_DEBUG_ERROR,
  83                           "acl_module_init: Unable to register control with rootdse!\n");
  84                 return ldb_operr(ldb);
  85         }
  86
  87         data = talloc(module, struct acl_private);
  88         if (data == NULL) {
  89                 return ldb_oom(ldb);
  90         }
  91
  92         data->password_attrs = NULL;
  93         data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
  94                                          NULL, "acl", "perform", false);
  95         ldb_module_set_private(module, data);
  96
  97         mem_ctx = talloc_new(module);
  98         if (!mem_ctx) {
  99                 return ldb_oom(ldb);
 100         }
 101
 102         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 103                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 104                                     attrs,
 105                                     DSDB_FLAG_NEXT_MODULE);
 106         if (ret != LDB_SUCCESS) {
 107                 goto done;
 108         }
 109         if (res->count == 0) {
 110                 goto done;
 111         }
 112
 113         if (res->count > 1) {
 114                 talloc_free(mem_ctx);
 115                 return LDB_ERR_CONSTRAINT_VIOLATION;
 116         }
 117
 118         msg = res->msgs[0];
 119
 120         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 121         if (!password_attributes) {
 122                 goto done;
 123         }
 124         data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
 125         if (!data->password_attrs) {
 126                 talloc_free(mem_ctx);
 127                 return ldb_oom(ldb);
 128         }
 129         for (i=0; i < password_attributes->num_values; i++) {
 130                 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
 131                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 132         }
 133         data->password_attrs[i] = NULL;
 134
 135 done:
 136         talloc_free(mem_ctx);
 137         return ldb_next_init(module);
 138 }
 139
 140 static int acl_allowedAttributes(struct ldb_module *module,
 141                                  const struct dsdb_schema *schema,
 142                                  struct ldb_message *sd_msg,
 143                                  struct ldb_message *msg,
 144                                  struct acl_context *ac)
 145 {
 146         struct ldb_message_element *oc_el;
 147         struct ldb_context *ldb = ldb_module_get_ctx(module);
 148         TALLOC_CTX *mem_ctx;
 149         const char **attr_list;
 150         int i, ret;
 151
 152         /* If we don't have a schema yet, we can't do anything... */
 153         if (schema == NULL) {
 154                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 155                 return LDB_ERR_OPERATIONS_ERROR;
 156         }
 157
 158         /* Must remove any existing attribute */
 159         if (ac->allowedAttributes) {
 160                 ldb_msg_remove_attr(msg, "allowedAttributes");
 161         }
 162
 163         mem_ctx = talloc_new(msg);
 164         if (!mem_ctx) {
 165                 return ldb_oom(ldb);
 166         }
 167
 168         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 169         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 170         if (!attr_list) {
 171                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 172                 talloc_free(mem_ctx);
 173                 return LDB_ERR_OPERATIONS_ERROR;
 174         }
 175         if (ac->allowedAttributes) {
 176                 for (i=0; attr_list && attr_list[i]; i++) {
 177                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 178                 }
 179         }
 180         if (ac->allowedAttributesEffective) {
 181                 struct security_descriptor *sd;
 182                 struct dom_sid *sid = NULL;
 183                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 184                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 185
 186                 if (as_system != NULL) {
 187                         as_system->critical = 0;
 188                 }
 189
 190                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 191                 if (ac->am_system || as_system) {
 192                         for (i=0; attr_list && attr_list[i]; i++) {
 193                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 194                         }
 195                         return LDB_SUCCESS;
 196                 }
 197
 198                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 199
 200                 if (ret != LDB_SUCCESS) {
 201                         return ret;
 202                 }
 203
 204                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 205                 for (i=0; attr_list && attr_list[i]; i++) {
 206                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 207                                                                                         attr_list[i]);
 208                         if (!attr) {
 209                                 return ldb_operr(ldb);
 210                         }
 211                         /* remove constructed attributes */
 212                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 213                             || attr->systemOnly
 214                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 215                                 continue;
 216                         }
 217                         ret = acl_check_access_on_attribute(module,
 218                                                             msg,
 219                                                             sd,
 220                                                             sid,
 221                                                             SEC_ADS_WRITE_PROP,
 222                                                             attr);
 223                         if (ret == LDB_SUCCESS) {
 224                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 225                         }
 226                 }
 227         }
 228         return LDB_SUCCESS;
 229 }
 230
 231 static int acl_childClasses(struct ldb_module *module,
 232                             const struct dsdb_schema *schema,
 233                             struct ldb_message *sd_msg,
 234                             struct ldb_message *msg,
 235                             const char *attrName)
 236 {
 237         struct ldb_message_element *oc_el;
 238         struct ldb_message_element *allowedClasses;
 239         const struct dsdb_class *sclass;
 240         unsigned int i, j;
 241         int ret;
 242
 243         /* If we don't have a schema yet, we can't do anything... */
 244         if (schema == NULL) {
 245                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 246                 return LDB_ERR_OPERATIONS_ERROR;
 247         }
 248
 249         /* Must remove any existing attribute, or else confusion reins */
 250         ldb_msg_remove_attr(msg, attrName);
 251         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 252         if (ret != LDB_SUCCESS) {
 253                 return ret;
 254         }
 255
 256         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 257
 258         for (i=0; oc_el && i < oc_el->num_values; i++) {
 259                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 260                 if (!sclass) {
 261                         /* We don't know this class?  what is going on? */
 262                         continue;
 263                 }
 264
 265                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 266                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 267                 }
 268         }
 269         if (allowedClasses->num_values > 1) {
 270                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 271                 for (i=1 ; i < allowedClasses->num_values; i++) {
 272                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 273                         struct ldb_val *val2 = &allowedClasses->values[i];
 274                         if (data_blob_cmp(val1, val2) == 0) {
 275                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 276                                 allowedClasses->num_values--;
 277                                 i--;
 278                         }
 279                 }
 280         }
 281
 282         return LDB_SUCCESS;
 283 }
 284
 285 static int acl_childClassesEffective(struct ldb_module *module,
 286                                      const struct dsdb_schema *schema,
 287                                      struct ldb_message *sd_msg,
 288                                      struct ldb_message *msg,
 289                                      struct acl_context *ac)
 290 {
 291         struct ldb_message_element *oc_el;
 292         struct ldb_message_element *allowedClasses = NULL;
 293         const struct dsdb_class *sclass;
 294         struct security_descriptor *sd;
 295         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 296                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 297         struct dom_sid *sid = NULL;
 298         unsigned int i, j;
 299         int ret;
 300
 301         if (as_system != NULL) {
 302                 as_system->critical = 0;
 303         }
 304
 305         if (ac->am_system || as_system) {
 306                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 307         }
 308
 309         /* If we don't have a schema yet, we can't do anything... */
 310         if (schema == NULL) {
 311                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 312                 return LDB_ERR_OPERATIONS_ERROR;
 313         }
 314
 315         /* Must remove any existing attribute, or else confusion reins */
 316         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 317
 318         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 319         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 320         if (ret != LDB_SUCCESS) {
 321                 return ret;
 322         }
 323
 324         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 325         for (i=0; oc_el && i < oc_el->num_values; i++) {
 326                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 327                 if (!sclass) {
 328                         /* We don't know this class?  what is going on? */
 329                         continue;
 330                 }
 331
 332                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 333                         ret = acl_check_access_on_class(module,
 334                                                         schema,
 335                                                         msg,
 336                                                         sd,
 337                                                         sid,
 338                                                         SEC_ADS_CREATE_CHILD,
 339                                                         sclass->possibleInferiors[j]);
 340                         if (ret == LDB_SUCCESS) {
 341                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 342                                                    sclass->possibleInferiors[j]);
 343                         }
 344                 }
 345         }
 346         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 347         if (!allowedClasses) {
 348                 return LDB_SUCCESS;
 349         }
 350
 351         if (allowedClasses->num_values > 1) {
 352                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 353                 for (i=1 ; i < allowedClasses->num_values; i++) {
 354                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 355                         struct ldb_val *val2 = &allowedClasses->values[i];
 356                         if (data_blob_cmp(val1, val2) == 0) {
 357                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 358                                 allowedClasses->num_values--;
 359                                 i--;
 360                         }
 361                 }
 362         }
 363         return LDB_SUCCESS;
 364 }
 365
 366 static int acl_sDRightsEffective(struct ldb_module *module,
 367                                  struct ldb_message *sd_msg,
 368                                  struct ldb_message *msg,
 369                                  struct acl_context *ac)
 370 {
 371         struct ldb_message_element *rightsEffective;
 372         int ret;
 373         struct security_descriptor *sd;
 374         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 375                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 376         struct dom_sid *sid = NULL;
 377         uint32_t flags = 0;
 378
 379         if (as_system != NULL) {
 380                 as_system->critical = 0;
 381         }
 382
 383         /* Must remove any existing attribute, or else confusion reins */
 384         ldb_msg_remove_attr(msg, "sDRightsEffective");
 385         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 386         if (ret != LDB_SUCCESS) {
 387                 return ret;
 388         }
 389         if (ac->am_system || as_system) {
 390                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 391         }
 392         else {
 393                 /* Get the security descriptor from the message */
 394                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 395                 if (ret != LDB_SUCCESS) {
 396                         return ret;
 397                 }
 398                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 399                 ret = acl_check_access_on_attribute(module,
 400                                                     msg,
 401                                                     sd,
 402                                                     sid,
 403                                                     SEC_STD_WRITE_OWNER,
 404                                                     NULL);
 405                 if (ret == LDB_SUCCESS) {
 406                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 407                 }
 408                 ret = acl_check_access_on_attribute(module,
 409                                                     msg,
 410                                                     sd,
 411                                                     sid,
 412                                                     SEC_STD_WRITE_DAC,
 413                                                     NULL);
 414                 if (ret == LDB_SUCCESS) {
 415                         flags |= SECINFO_DACL;
 416                 }
 417                 ret = acl_check_access_on_attribute(module,
 418                                                     msg,
 419                                                     sd,
 420                                                     sid,
 421                                                     SEC_FLAG_SYSTEM_SECURITY,
 422                                                     NULL);
 423                 if (ret == LDB_SUCCESS) {
 424                         flags |= SECINFO_SACL;
 425                 }
 426         }
 427         ldb_msg_add_fmt(msg, "sDRightsEffective", "%u", flags);
 428         return LDB_SUCCESS;
 429 }
 430
 431 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 432 {
 433         int ret;
 434         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 435         struct ldb_context *ldb;
 436         const struct dsdb_schema *schema;
 437         struct ldb_message_element *oc_el;
 438         const struct GUID *guid;
 439         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 440
 441         if (as_system != NULL) {
 442                 as_system->critical = 0;
 443         }
 444
 445         if (dsdb_module_am_system(module) || as_system) {
 446                 return ldb_next_request(module, req);
 447         }
 448
 449         if (ldb_dn_is_special(req->op.add.message->dn)) {
 450                 return ldb_next_request(module, req);
 451         }
 452         ldb = ldb_module_get_ctx(module);
 453         /* Creating an NC. There is probably something we should do here,
 454          * but we will establish that later */
 455         /* FIXME: this has to be made dynamic at some point */
 456         if ((ldb_dn_compare(req->op.add.message->dn, (ldb_get_schema_basedn(ldb))) == 0) ||
 457             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_config_basedn(ldb))) == 0) ||
 458             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_default_basedn(ldb))) == 0)) {
 459                 return ldb_next_request(module, req);
 460         }
 461
 462         schema = dsdb_get_schema(ldb, req);
 463         if (!schema) {
 464                 return ldb_operr(ldb);
 465         }
 466
 467         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 468         if (!oc_el || oc_el->num_values == 0) {
 469                 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
 470                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 471         }
 472
 473         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 474                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 475         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid);
 476         if (ret != LDB_SUCCESS) {
 477                 return ret;
 478         }
 479         return ldb_next_request(module, req);
 480 }
 481
 482 /* ckecks if modifications are allowed on "Member" attribute */
 483 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 484                                      struct ldb_module *module,
 485                                      struct ldb_request *req,
 486                                      struct security_descriptor *sd,
 487                                      struct dom_sid *sid,
 488                                      const struct GUID *oc_guid,
 489                                      const struct dsdb_attribute *attr)
 490 {
 491         int ret;
 492         unsigned int i;
 493         struct ldb_context *ldb = ldb_module_get_ctx(module);
 494         struct ldb_dn *user_dn;
 495         struct ldb_message_element *member_el;
 496         /* if we have wp, we can do whatever we like */
 497         if (acl_check_access_on_attribute(module,
 498                                           mem_ctx,
 499                                           sd,
 500                                           sid,
 501                                           SEC_ADS_WRITE_PROP,
 502                                           attr) == LDB_SUCCESS) {
 503                 return LDB_SUCCESS;
 504         }
 505         /* if we are adding/deleting ourselves, check for self membership */
 506         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 507                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 508                                   &user_dn);
 509         if (ret != LDB_SUCCESS) {
 510                 return ret;
 511         }
 512         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 513         if (!member_el) {
 514                 return ldb_operr(ldb);
 515         }
 516         /* user can only remove oneself */
 517         if (member_el->num_values == 0) {
 518                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 519         }
 520         for (i = 0; i < member_el->num_values; i++) {
 521                 if (strcasecmp((const char *)member_el->values[i].data,
 522                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 523                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 524                 }
 525         }
 526         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 527                                        GUID_DRS_SELF_MEMBERSHIP,
 528                                        SEC_ADS_SELF_WRITE,
 529                                        sid);
 530         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 531                 dsdb_acl_debug(sd, acl_user_token(module),
 532                                req->op.mod.message->dn,
 533                                true,
 534                                10);
 535         }
 536         return ret;
 537 }
 538
 539 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 540                                      struct ldb_module *module,
 541                                      struct ldb_request *req,
 542                                      struct security_descriptor *sd,
 543                                      struct dom_sid *sid,
 544                                      const struct GUID *oc_guid)
 545 {
 546         int ret = LDB_SUCCESS;
 547         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 548         struct ldb_message_element *el;
 549         struct ldb_message *msg;
 550         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 551                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 552         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 553
 554         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 555         if (msg == NULL) {
 556                 return ldb_module_oom(module);
 557         }
 558         for (l = passwordAttrs; *l != NULL; l++) {
 559                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 560                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 561                                 ++del_attr_cnt;
 562                         }
 563                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 564                                 ++add_attr_cnt;
 565                         }
 566                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 567                                 ++rep_attr_cnt;
 568                         }
 569                         ldb_msg_remove_element(msg, el);
 570                 }
 571         }
 572         /* a single delete will be handled by password hash
 573            later in the stack, so we let it though here */
 574         if (del_attr_cnt > 0 && add_attr_cnt == 0) {
 575                 talloc_free(tmp_ctx);
 576                 return LDB_SUCCESS;
 577         }
 578
 579         if (ldb_request_get_control(req,
 580                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 581                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 582                  * have a user password change and not a set as the message
 583                  * looks like. In it's value blob it contains the NT and/or LM
 584                  * hash of the old password specified by the user.
 585                  * This control is used by the SAMR and "kpasswd" password
 586                  * change mechanisms. */
 587                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 588                                                GUID_DRS_USER_CHANGE_PASSWORD,
 589                                                SEC_ADS_CONTROL_ACCESS,
 590                                                sid);
 591         }
 592         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 593                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 594                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 595                                                SEC_ADS_CONTROL_ACCESS,
 596                                                sid);
 597         }
 598         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 599                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 600                                                GUID_DRS_USER_CHANGE_PASSWORD,
 601                                                SEC_ADS_CONTROL_ACCESS,
 602                                                sid);
 603                 /* Very strange, but we get constraint violation in this case */
 604                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 605                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 606                 }
 607         }
 608         if (ret != LDB_SUCCESS) {
 609                 dsdb_acl_debug(sd, acl_user_token(module),
 610                                req->op.mod.message->dn,
 611                                true,
 612                                10);
 613         }
 614         talloc_free(tmp_ctx);
 615         return ret;
 616 }
 617
 618 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 619 {
 620         int ret;
 621         struct ldb_context *ldb = ldb_module_get_ctx(module);
 622         const struct dsdb_schema *schema;
 623         unsigned int i;
 624         const struct GUID *guid;
 625         uint32_t access_granted;
 626         struct object_tree *root = NULL;
 627         struct object_tree *new_node = NULL;
 628         NTSTATUS status;
 629         struct ldb_result *acl_res;
 630         struct security_descriptor *sd;
 631         struct dom_sid *sid = NULL;
 632         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 633         TALLOC_CTX *tmp_ctx = talloc_new(req);
 634         static const char *acl_attrs[] = {
 635                 "nTSecurityDescriptor",
 636                 "objectClass",
 637                 "objectSid",
 638                 NULL
 639         };
 640
 641         if (as_system != NULL) {
 642                 as_system->critical = 0;
 643         }
 644
 645         /* Don't print this debug statement if elements[0].name is going to be NULL */
 646         if(req->op.mod.message->num_elements > 0)
 647         {
 648                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 649         }
 650         if (dsdb_module_am_system(module) || as_system) {
 651                 return ldb_next_request(module, req);
 652         }
 653         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 654                 return ldb_next_request(module, req);
 655         }
 656         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 657                                     acl_attrs,
 658                                     DSDB_FLAG_NEXT_MODULE);
 659
 660         if (ret != LDB_SUCCESS) {
 661                 goto fail;
 662         }
 663
 664         schema = dsdb_get_schema(ldb, tmp_ctx);
 665         if (!schema) {
 666                 ret = LDB_ERR_OPERATIONS_ERROR;
 667                 goto fail;
 668         }
 669
 670         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 671         if (ret != LDB_SUCCESS) {
 672                 DEBUG(10, ("acl_modify: cannot get descriptor\n"));
 673                 goto fail;
 674         }
 675         /* Theoretically we pass the check if the object has no sd */
 676         if (!sd) {
 677                 goto success;
 678         }
 679
 680         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 681         if (!guid) {
 682                 DEBUG(10, ("acl_modify: cannot get guid\n"));
 683                 goto fail;
 684         }
 685         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 686         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 687                                    &root, &new_node)) {
 688                 DEBUG(10, ("acl_modify: cannot add to object tree\n"));
 689                 goto fail;
 690         }
 691         for (i=0; i < req->op.mod.message->num_elements; i++){
 692                 const struct dsdb_attribute *attr;
 693                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
 694                                                                  req->op.mod.message->elements[i].name);
 695
 696                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
 697                         status = sec_access_check_ds(sd, acl_user_token(module),
 698                                              SEC_STD_WRITE_DAC,
 699                                              &access_granted,
 700                                              NULL,
 701                                              sid);
 702
 703                         if (!NT_STATUS_IS_OK(status)) {
 704                                 DEBUG(10, ("Object %s has no write dacl access\n",
 705                                            ldb_dn_get_linearized(req->op.mod.message->dn)));
 706                                 dsdb_acl_debug(sd,
 707                                                acl_user_token(module),
 708                                                req->op.mod.message->dn,
 709                                                true,
 710                                                10);
 711                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 712                                 goto fail;
 713                         }
 714                 }
 715                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
 716                         ret = acl_check_self_membership(tmp_ctx,
 717                                                         module,
 718                                                         req,
 719                                                         sd,
 720                                                         sid,
 721                                                         guid,
 722                                                         attr);
 723                         if (ret != LDB_SUCCESS) {
 724                                 goto fail;
 725                         }
 726                 }
 727                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
 728                         /* this one is not affected by any rights, we should let it through
 729                            so that passwords_hash returns the correct error */
 730                         continue;
 731                 }
 732                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
 733                          ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0 ||
 734                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
 735                         ret = acl_check_password_rights(tmp_ctx,
 736                                                         module,
 737                                                         req,
 738                                                         sd,
 739                                                         sid,
 740                                                         guid);
 741                         if (ret != LDB_SUCCESS) {
 742                                 goto fail;
 743                         }
 744                 } else {
 745
 746                 /* This basic attribute existence check with the right errorcode
 747                  * is needed since this module is the first one which requests
 748                  * schema attribute informations.
 749                  * The complete attribute checking is done in the
 750                  * "objectclass_attrs" module behind this one.
 751                  */
 752                         if (!attr) {
 753                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
 754                                                        req->op.mod.message->elements[i].name,
 755                                                ldb_dn_get_linearized(req->op.mod.message->dn));
 756                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
 757                                 goto fail;
 758                         }
 759                         if (!insert_in_object_tree(tmp_ctx,
 760                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
 761                                                    &new_node, &new_node)) {
 762                                 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
 763                                 ret = LDB_ERR_OPERATIONS_ERROR;
 764                                 goto fail;
 765                         }
 766
 767                         if (!insert_in_object_tree(tmp_ctx,
 768                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
 769                                 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
 770                                 ret = LDB_ERR_OPERATIONS_ERROR;
 771                                 goto fail;
 772                         }
 773                 }
 774         }
 775
 776         if (root->num_of_children > 0) {
 777                 status = sec_access_check_ds(sd, acl_user_token(module),
 778                                              SEC_ADS_WRITE_PROP,
 779                                              &access_granted,
 780                                              root,
 781                                              sid);
 782
 783                 if (!NT_STATUS_IS_OK(status)) {
 784                         DEBUG(10, ("Object %s has no write property access\n",
 785                                    ldb_dn_get_linearized(req->op.mod.message->dn)));
 786                         dsdb_acl_debug(sd,
 787                                   acl_user_token(module),
 788                                   req->op.mod.message->dn,
 789                                   true,
 790                                   10);
 791                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 792                         goto fail;
 793                 }
 794         }
 795
 796 success:
 797         talloc_free(tmp_ctx);
 798         return ldb_next_request(module, req);
 799 fail:
 800         talloc_free(tmp_ctx);
 801         return ret;
 802 }
 803
 804 /* similar to the modify for the time being.
 805  * We need to concider the special delete tree case, though - TODO */
 806 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
 807 {
 808         int ret;
 809         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
 810         struct ldb_context *ldb;
 811         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 812
 813         if (as_system != NULL) {
 814                 as_system->critical = 0;
 815         }
 816
 817         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
 818         if (dsdb_module_am_system(module) || as_system) {
 819                 return ldb_next_request(module, req);
 820         }
 821
 822         if (ldb_dn_is_special(req->op.del.dn)) {
 823                 return ldb_next_request(module, req);
 824         }
 825         ldb = ldb_module_get_ctx(module);
 826         /* first check if we have delete object right */
 827         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn, SEC_STD_DELETE, NULL);
 828         if (ret == LDB_SUCCESS) {
 829                 return ldb_next_request(module, req);
 830         }
 831
 832         /* Nope, we don't have delete object. Lets check if we have delete child on the parent */
 833         /* No parent, so check fails */
 834         /* FIXME: this has to be made dynamic at some point */
 835         if ((ldb_dn_compare(req->op.del.dn, (ldb_get_schema_basedn(ldb))) == 0) ||
 836             (ldb_dn_compare(req->op.del.dn, (ldb_get_config_basedn(ldb))) == 0) ||
 837             (ldb_dn_compare(req->op.del.dn, (ldb_get_default_basedn(ldb))) == 0)) {
 838                 DEBUG(10,("acl:deleting an NC\n"));
 839                 return ldb_module_done(req, NULL, NULL, LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS);
 840         }
 841
 842         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_DELETE_CHILD, NULL);
 843         if (ret != LDB_SUCCESS) {
 844                 return ret;
 845         }
 846         return ldb_next_request(module, req);
 847 }
 848
 849 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
 850 {
 851         int ret;
 852         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
 853         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
 854         const struct dsdb_schema *schema;
 855         struct ldb_context *ldb;
 856         struct security_descriptor *sd = NULL;
 857         struct dom_sid *sid = NULL;
 858         struct ldb_result *acl_res;
 859         const struct GUID *guid;
 860         struct object_tree *root = NULL;
 861         struct object_tree *new_node = NULL;
 862         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 863         TALLOC_CTX *tmp_ctx = talloc_new(req);
 864         NTSTATUS status;
 865         uint32_t access_granted;
 866         const char *rdn_name;
 867         static const char *acl_attrs[] = {
 868                 "nTSecurityDescriptor",
 869                 "objectClass",
 870                 "objectSid",
 871                 NULL
 872         };
 873
 874         if (as_system != NULL) {
 875                 as_system->critical = 0;
 876         }
 877
 878         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
 879         if (dsdb_module_am_system(module) || as_system) {
 880                 return ldb_next_request(module, req);
 881         }
 882         if (ldb_dn_is_special(req->op.rename.olddn)) {
 883                 return ldb_next_request(module, req);
 884         }
 885         ldb = ldb_module_get_ctx(module);
 886
 887         ret = dsdb_module_search_dn(module, req, &acl_res, req->op.rename.olddn,
 888                                     acl_attrs,
 889                                     DSDB_FLAG_NEXT_MODULE |
 890                                     DSDB_SEARCH_SHOW_DELETED);
 891         /* we sould be able to find the parent */
 892         if (ret != LDB_SUCCESS) {
 893                 DEBUG(10,("acl: failed to find object %s\n",
 894                           ldb_dn_get_linearized(req->op.rename.olddn)));
 895                 return ret;
 896         }
 897
 898         schema = dsdb_get_schema(ldb, acl_res);
 899         if (!schema) {
 900                 talloc_free(acl_res);
 901                 return ldb_operr(ldb);
 902         }
 903
 904         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 905         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 906                                    &root, &new_node)) {
 907                 return ldb_operr(ldb);
 908         };
 909
 910         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
 911                                                           "name");
 912         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 913                                    &new_node, &new_node)) {
 914                 return ldb_operr(ldb);
 915         };
 916
 917         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
 918         if (rdn_name == NULL) {
 919                 return ldb_operr(ldb);
 920         }
 921         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
 922                                                           rdn_name);
 923         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 924                                    &new_node, &new_node)) {
 925                 return ldb_operr(ldb);
 926         };
 927
 928         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
 929
 930         if (ret != LDB_SUCCESS) {
 931                 return ldb_operr(ldb);
 932         }
 933         /* Theoretically we pass the check if the object has no sd */
 934         if (!sd) {
 935                 return LDB_SUCCESS;
 936         }
 937         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 938         status = sec_access_check_ds(sd, acl_user_token(module),
 939                                      SEC_ADS_WRITE_PROP,
 940                                      &access_granted,
 941                                      root,
 942                                      sid);
 943
 944         if (!NT_STATUS_IS_OK(status)) {
 945                 DEBUG(10, ("Object %s has no wp on name\n",
 946                            ldb_dn_get_linearized(req->op.rename.olddn)));
 947                 dsdb_acl_debug(sd,
 948                           acl_user_token(module),
 949                           req->op.rename.olddn,
 950                           true,
 951                           10);
 952                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 953         }
 954
 955         if (ldb_dn_compare(oldparent, newparent) == 0) {
 956                 /* regular rename, not move, nothing more to do */
 957                 return ldb_next_request(module, req);
 958         }
 959
 960         /* What exactly to do in this case? It would fail anyway.. */
 961         /* FIXME: this has to be made dynamic at some point */
 962         if ((ldb_dn_compare(req->op.rename.newdn, (ldb_get_schema_basedn(ldb))) == 0) ||
 963             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_config_basedn(ldb))) == 0) ||
 964             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_default_basedn(ldb))) == 0)) {
 965                 DEBUG(10,("acl:moving as an NC\n"));
 966                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 967         }
 968         /* new parent should have create child */
 969         talloc_free(tmp_ctx);
 970         tmp_ctx = talloc_new(req);
 971         root = NULL;
 972         new_node = NULL;
 973         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 974         if (!guid) {
 975                 DEBUG(10,("acl:renamed object has no object class\n"));
 976                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
 977         }
 978
 979         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid);
 980         if (ret != LDB_SUCCESS) {
 981                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
 982                 return ret;
 983         }
 984         /* do we have delete object on the object? */
 985
 986         status = sec_access_check_ds(sd, acl_user_token(module),
 987                                      SEC_STD_DELETE,
 988                                      &access_granted,
 989                                      NULL,
 990                                      sid);
 991
 992         if (NT_STATUS_IS_OK(status)) {
 993                 return ldb_next_request(module, req);
 994         }
 995         /* what about delete child on the current parent */
 996         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL);
 997         if (ret != LDB_SUCCESS) {
 998                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
 999                 return ldb_module_done(req, NULL, NULL, ret);
1000         }
1001         return ldb_next_request(module, req);
1002 }
1003
1004 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1005 {
1006         struct ldb_context *ldb;
1007         struct acl_context *ac;
1008         struct acl_private *data;
1009         struct ldb_result *acl_res;
1010         static const char *acl_attrs[] = {
1011                 "objectClass",
1012                 "nTSecurityDescriptor",
1013                 "objectSid",
1014                 NULL
1015         };
1016         int ret, i;
1017
1018         ac = talloc_get_type(req->context, struct acl_context);
1019         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1020         ldb = ldb_module_get_ctx(ac->module);
1021
1022         if (!ares) {
1023                 return ldb_module_done(ac->req, NULL, NULL,
1024                                        LDB_ERR_OPERATIONS_ERROR);
1025         }
1026         if (ares->error != LDB_SUCCESS) {
1027                 return ldb_module_done(ac->req, ares->controls,
1028                                        ares->response, ares->error);
1029         }
1030
1031         switch (ares->type) {
1032         case LDB_REPLY_ENTRY:
1033                 if (ac->allowedAttributes
1034                     || ac->allowedChildClasses
1035                     || ac->allowedChildClassesEffective
1036                     || ac->allowedAttributesEffective
1037                     || ac->sDRightsEffective) {
1038                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1039                                                     acl_attrs,
1040                                                     DSDB_FLAG_NEXT_MODULE);
1041                         if (ret != LDB_SUCCESS) {
1042                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1043                         }
1044                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1045                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1046                                 if (ret != LDB_SUCCESS) {
1047                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1048                                 }
1049                         }
1050                         if (ac->allowedChildClasses) {
1051                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1052                                                        ares->message, "allowedChildClasses");
1053                                 if (ret != LDB_SUCCESS) {
1054                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1055                                 }
1056                         }
1057                         if (ac->allowedChildClassesEffective) {
1058                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1059                                                                 acl_res->msgs[0], ares->message, ac);
1060                                 if (ret != LDB_SUCCESS) {
1061                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1062                                 }
1063                         }
1064                         if (ac->sDRightsEffective) {
1065                                 ret = acl_sDRightsEffective(ac->module,
1066                                                             acl_res->msgs[0], ares->message, ac);
1067                                 if (ret != LDB_SUCCESS) {
1068                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1069                                 }
1070                         }
1071                 }
1072                 if (data && data->password_attrs) {
1073                         if (!ac->am_system) {
1074                                 for (i = 0; data->password_attrs[i]; i++) {
1075                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1076                                 }
1077                         }
1078                 }
1079                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1080
1081         case LDB_REPLY_REFERRAL:
1082                 return ldb_module_send_referral(ac->req, ares->referral);
1083
1084         case LDB_REPLY_DONE:
1085                 return ldb_module_done(ac->req, ares->controls,
1086                                        ares->response, LDB_SUCCESS);
1087
1088         }
1089         return LDB_SUCCESS;
1090 }
1091
1092 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1093 {
1094         struct ldb_context *ldb;
1095         struct acl_context *ac;
1096         struct ldb_request *down_req;
1097         struct acl_private *data;
1098         int ret, i;
1099
1100         ldb = ldb_module_get_ctx(module);
1101
1102         ac = talloc_zero(req, struct acl_context);
1103         if (ac == NULL) {
1104                 return ldb_oom(ldb);
1105         }
1106         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1107
1108         ac->module = module;
1109         ac->req = req;
1110         ac->am_system = dsdb_module_am_system(module);
1111         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1112         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1113         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1114         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1115         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1116         ac->schema = dsdb_get_schema(ldb, ac);
1117
1118         /* replace any attributes in the parse tree that are private,
1119            so we don't allow a search for 'userPassword=penguin',
1120            just as we would not allow that attribute to be returned */
1121         if (ac->am_system) {
1122                 /* FIXME: We should copy the tree and keep the original unmodified. */
1123                 /* remove password attributes */
1124                 if (data && data->password_attrs) {
1125                         for (i = 0; data->password_attrs[i]; i++) {
1126                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1127                                                             data->password_attrs[i],
1128                                                             "kludgeACLredactedattribute");
1129                         }
1130                 }
1131         }
1132         ret = ldb_build_search_req_ex(&down_req,
1133                                       ldb, ac,
1134                                       req->op.search.base,
1135                                       req->op.search.scope,
1136                                       req->op.search.tree,
1137                                       req->op.search.attrs,
1138                                       req->controls,
1139                                       ac, acl_search_callback,
1140                                       req);
1141         LDB_REQ_SET_LOCATION(down_req);
1142         if (ret != LDB_SUCCESS) {
1143                 return ret;
1144         }
1145         /* perform the search */
1146         return ldb_next_request(module, down_req);
1147 }
1148
1149 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1150 {
1151         struct ldb_context *ldb = ldb_module_get_ctx(module);
1152         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1153
1154         /* allow everybody to read the sequence number */
1155         if (strcmp(req->op.extended.oid,
1156                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1157                 return ldb_next_request(module, req);
1158         }
1159
1160         if (dsdb_module_am_system(module) ||
1161             dsdb_module_am_administrator(module) || as_system) {
1162                 return ldb_next_request(module, req);
1163         } else {
1164                 ldb_asprintf_errstring(ldb,
1165                                        "acl_extended: "
1166                                        "attempted database modify not permitted. "
1167                                        "User %s is not SYSTEM or an administrator",
1168                                        acl_user_name(req, module));
1169                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1170         }
1171 }
1172
1173 _PUBLIC_ const struct ldb_module_ops ldb_acl_module_ops = {
1174         .name              = "acl",
1175         .search            = acl_search,
1176         .add               = acl_add,
1177         .modify            = acl_modify,
1178         .del               = acl_delete,
1179         .rename            = acl_rename,
1180         .extended          = acl_extended,
1181         .init_context      = acl_module_init
1182 };