source4/dsdb/samdb/ldb_modules/schema_data.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3
   4    The module that handles the Schema checkings and dynamic attributes
   5
   6    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2009
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 */
  23
  24 #include "includes.h"
  25 #include "ldb_module.h"
  26 #include "dsdb/samdb/samdb.h"
  27 #include "librpc/gen_ndr/ndr_misc.h"
  28 #include "librpc/gen_ndr/ndr_drsuapi.h"
  29 #include "librpc/gen_ndr/ndr_drsblobs.h"
  30 #include "param/param.h"
  31 #include "dsdb/samdb/ldb_modules/util.h"
  32
  33 static int generate_objectClasses(struct ldb_context *ldb, struct ldb_message *msg,
  34                                   const struct dsdb_schema *schema);
  35 static int generate_attributeTypes(struct ldb_context *ldb, struct ldb_message *msg,
  36                                    const struct dsdb_schema *schema);
  37 static int generate_dITContentRules(struct ldb_context *ldb, struct ldb_message *msg,
  38                                     const struct dsdb_schema *schema);
  39 static int generate_extendedAttributeInfo(struct ldb_context *ldb, struct ldb_message *msg,
  40                                           const struct dsdb_schema *schema);
  41 static int generate_extendedClassInfo(struct ldb_context *ldb, struct ldb_message *msg,
  42                                       const struct dsdb_schema *schema);
  43 static int generate_possibleInferiors(struct ldb_context *ldb, struct ldb_message *msg,
  44                                       const struct dsdb_schema *schema);
  45
  46 static const struct {
  47         const char *attr;
  48         int (*fn)(struct ldb_context *, struct ldb_message *, const struct dsdb_schema *);
  49         bool aggregate;
  50 } generated_attrs[] = {
  51         {
  52                 .attr = "objectClasses",
  53                 .fn = generate_objectClasses,
  54                 .aggregate = true,
  55         },
  56         {
  57                 .attr = "attributeTypes",
  58                 .fn = generate_attributeTypes,
  59                 .aggregate = true,
  60         },
  61         {
  62                 .attr = "dITContentRules",
  63                 .fn = generate_dITContentRules,
  64                 .aggregate = true,
  65         },
  66         {
  67                 .attr = "extendedAttributeInfo",
  68                 .fn = generate_extendedAttributeInfo,
  69                 .aggregate = true,
  70         },
  71         {
  72                 .attr = "extendedClassInfo",
  73                 .fn = generate_extendedClassInfo,
  74                 .aggregate = true,
  75         },
  76         {
  77                 .attr = "possibleInferiors",
  78                 .fn = generate_possibleInferiors,
  79                 .aggregate = false,
  80         }
  81 };
  82
  83 struct schema_data_private_data {
  84         struct ldb_dn *aggregate_dn;
  85         struct ldb_dn *schema_dn;
  86 };
  87
  88 struct schema_data_search_data {
  89         struct ldb_module *module;
  90         struct ldb_request *req;
  91
  92         const struct dsdb_schema *schema;
  93 };
  94
  95 static int schema_data_init(struct ldb_module *module)
  96 {
  97         struct ldb_context *ldb;
  98         struct ldb_dn *schema_dn;
  99         int ret;
 100         struct schema_data_private_data *data;
 101
 102         ret = ldb_next_init(module);
 103         if (ret != LDB_SUCCESS) {
 104                 return ret;
 105         }
 106
 107         ldb = ldb_module_get_ctx(module);
 108         schema_dn = ldb_get_schema_basedn(ldb);
 109         if (!schema_dn) {
 110                 ldb_reset_err_string(ldb);
 111                 ldb_debug(ldb, LDB_DEBUG_WARNING,
 112                           "schema_data_init: no schema dn present: (skip schema loading)\n");
 113                 return LDB_SUCCESS;
 114         }
 115
 116         data = talloc(module, struct schema_data_private_data);
 117         if (data == NULL) {
 118                 return ldb_oom(ldb);
 119         }
 120
 121         data->schema_dn = schema_dn;
 122
 123         /* Used to check to see if this is a result on the CN=Aggregate schema */
 124         data->aggregate_dn = samdb_aggregate_schema_dn(ldb, data);
 125         if (!data->aggregate_dn) {
 126                 ldb_asprintf_errstring(ldb, "schema_data_init: Could not build aggregate schema DN for schema in %s", ldb_dn_get_linearized(schema_dn));
 127                 return LDB_ERR_OPERATIONS_ERROR;
 128         }
 129
 130         ldb_module_set_private(module, data);
 131         return LDB_SUCCESS;
 132 }
 133
 134 static int schema_data_add(struct ldb_module *module, struct ldb_request *req)
 135 {
 136         struct ldb_context *ldb;
 137         struct dsdb_schema *schema;
 138         const struct ldb_val *attributeID = NULL;
 139         const struct ldb_val *governsID = NULL;
 140         const char *oid_attr = NULL;
 141         const char *oid = NULL;
 142         struct ldb_dn *parent_dn = NULL;
 143         int cmp;
 144         WERROR status;
 145         bool rodc = false;
 146         int ret;
 147
 148         ldb = ldb_module_get_ctx(module);
 149
 150         /* special objects should always go through */
 151         if (ldb_dn_is_special(req->op.add.message->dn)) {
 152                 return ldb_next_request(module, req);
 153         }
 154
 155         /* replicated update should always go through */
 156         if (ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 157                 return ldb_next_request(module, req);
 158         }
 159
 160         schema = dsdb_get_schema(ldb, req);
 161         if (!schema) {
 162                 return ldb_next_request(module, req);
 163         }
 164
 165         if (schema->base_dn == NULL) {
 166                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 167                           "schema_data_add: base_dn NULL\n");
 168                 return LDB_ERR_OPERATIONS_ERROR;
 169         }
 170
 171         ret = samdb_rodc(ldb, &rodc);
 172         if (ret != LDB_SUCCESS) {
 173                 DEBUG(4, (__location__ ": unable to tell if we are an RODC \n"));
 174         }
 175
 176         if (!schema->fsmo.we_are_master && !rodc) {
 177                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 178                           "schema_data_add: we are not master: reject request\n");
 179                 return LDB_ERR_UNWILLING_TO_PERFORM;
 180         }
 181
 182         if (!schema->fsmo.update_allowed && !rodc) {
 183                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 184                           "schema_data_add: updates are not allowed: reject request\n");
 185                 return LDB_ERR_UNWILLING_TO_PERFORM;
 186         }
 187
 188         if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID)) {
 189                 /*
 190                  * the provision code needs to create
 191                  * the schema root object.
 192                  */
 193                 cmp = ldb_dn_compare(req->op.add.message->dn, schema->base_dn);
 194                 if (cmp == 0) {
 195                         return ldb_next_request(module, req);
 196                 }
 197         }
 198
 199         parent_dn = ldb_dn_get_parent(req, req->op.add.message->dn);
 200         if (!parent_dn) {
 201                 return ldb_oom(ldb);
 202         }
 203
 204         cmp = ldb_dn_compare(parent_dn, schema->base_dn);
 205         if (cmp != 0) {
 206                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 207                           "schema_data_add: no direct child :%s\n",
 208                           ldb_dn_get_linearized(req->op.add.message->dn));
 209                 return LDB_ERR_UNWILLING_TO_PERFORM;
 210         }
 211
 212         attributeID = ldb_msg_find_ldb_val(req->op.add.message, "attributeID");
 213         governsID = ldb_msg_find_ldb_val(req->op.add.message, "governsID");
 214
 215         if (attributeID) {
 216                 oid_attr = "attributeID";
 217                 oid = talloc_strndup(req, (const char *)attributeID->data, attributeID->length);
 218         } else if (governsID) {
 219                 oid_attr = "governsID";
 220                 oid = talloc_strndup(req, (const char *)governsID->data, governsID->length);
 221         } else {
 222                 return ldb_next_request(module, req);
 223         }
 224
 225         if (!oid) {
 226                 return ldb_oom(ldb);
 227         }
 228
 229         status = dsdb_schema_pfm_find_oid(schema->prefixmap, oid, NULL);
 230         if (!W_ERROR_IS_OK(status)) {
 231                 /* check for internal errors */
 232                 if (!W_ERROR_EQUAL(status, WERR_NOT_FOUND)) {
 233                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 234                                       "schema_data_add: failed to map %s[%s]: %s\n",
 235                                       oid_attr, oid, win_errstr(status));
 236                         return LDB_ERR_UNWILLING_TO_PERFORM;
 237                 }
 238
 239                 /* Update prefixMap and save it */
 240                 status = dsdb_create_prefix_mapping(ldb, schema, oid);
 241                 if (!W_ERROR_IS_OK(status)) {
 242                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 243                                   "schema_data_add: failed to create prefix mapping for %s[%s]: %s\n",
 244                                   oid_attr, oid, win_errstr(status));
 245                         return LDB_ERR_UNWILLING_TO_PERFORM;
 246                 }
 247         }
 248
 249         return ldb_next_request(module, req);
 250 }
 251
 252 static int schema_data_modify(struct ldb_module *module, struct ldb_request *req)
 253 {
 254         struct ldb_context *ldb;
 255         struct dsdb_schema *schema;
 256         int cmp;
 257         bool rodc = false;
 258         int ret;
 259         struct ldb_control *sd_propagation_control;
 260
 261         ldb = ldb_module_get_ctx(module);
 262
 263         /* special objects should always go through */
 264         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 265                 return ldb_next_request(module, req);
 266         }
 267
 268         /* replicated update should always go through */
 269         if (ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 270                 return ldb_next_request(module, req);
 271         }
 272
 273         /* dbcheck should be able to fix things */
 274         if (ldb_request_get_control(req, DSDB_CONTROL_DBCHECK)) {
 275                 return ldb_next_request(module, req);
 276         }
 277
 278         sd_propagation_control = ldb_request_get_control(req,
 279                                         DSDB_CONTROL_SEC_DESC_PROPAGATION_OID);
 280         if (sd_propagation_control != NULL) {
 281                 if (req->op.mod.message->num_elements != 1) {
 282                         return ldb_module_operr(module);
 283                 }
 284                 ret = strcmp(req->op.mod.message->elements[0].name,
 285                              "nTSecurityDescriptor");
 286                 if (ret != 0) {
 287                         return ldb_module_operr(module);
 288                 }
 289
 290                 return ldb_next_request(module, req);
 291         }
 292
 293         schema = dsdb_get_schema(ldb, req);
 294         if (!schema) {
 295                 return ldb_next_request(module, req);
 296         }
 297
 298         cmp = ldb_dn_compare(req->op.mod.message->dn, schema->base_dn);
 299         if (cmp == 0) {
 300                 static const char * const constrained_attrs[] = {
 301                         "schemaInfo",
 302                         "prefixMap",
 303                         "msDs-Schema-Extensions",
 304                         "msDS-IntId",
 305                         NULL
 306                 };
 307                 size_t i;
 308                 struct ldb_message_element *el;
 309
 310                 if (ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID)) {
 311                         return ldb_next_request(module, req);
 312                 }
 313
 314                 for (i=0; constrained_attrs[i]; i++) {
 315                         el = ldb_msg_find_element(req->op.mod.message,
 316                                                   constrained_attrs[i]);
 317                         if (el == NULL) {
 318                                 continue;
 319                         }
 320
 321                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 322                                       "schema_data_modify: reject update "
 323                                       "of attribute[%s]\n",
 324                                       constrained_attrs[i]);
 325                         return LDB_ERR_CONSTRAINT_VIOLATION;
 326                 }
 327
 328                 return ldb_next_request(module, req);
 329         }
 330
 331         ret = samdb_rodc(ldb, &rodc);
 332         if (ret != LDB_SUCCESS) {
 333                 DEBUG(4, (__location__ ": unable to tell if we are an RODC \n"));
 334         }
 335
 336         if (!schema->fsmo.we_are_master && !rodc) {
 337                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 338                           "schema_data_modify: we are not master: reject request\n");
 339                 return LDB_ERR_UNWILLING_TO_PERFORM;
 340         }
 341
 342         if (!schema->fsmo.update_allowed && !rodc) {
 343                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 344                           "schema_data_modify: updates are not allowed: reject request\n");
 345                 return LDB_ERR_UNWILLING_TO_PERFORM;
 346         }
 347
 348         return ldb_next_request(module, req);
 349 }
 350
 351 static int schema_data_del(struct ldb_module *module, struct ldb_request *req)
 352 {
 353         struct ldb_context *ldb;
 354         struct dsdb_schema *schema;
 355         bool rodc = false;
 356         int ret;
 357
 358         ldb = ldb_module_get_ctx(module);
 359
 360         /* special objects should always go through */
 361         if (ldb_dn_is_special(req->op.del.dn)) {
 362                 return ldb_next_request(module, req);
 363         }
 364
 365         /* replicated update should always go through */
 366         if (ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 367                 return ldb_next_request(module, req);
 368         }
 369
 370         /* dbcheck should be able to fix things */
 371         if (ldb_request_get_control(req, DSDB_CONTROL_DBCHECK)) {
 372                 return ldb_next_request(module, req);
 373         }
 374
 375         schema = dsdb_get_schema(ldb, req);
 376         if (!schema) {
 377                 return ldb_next_request(module, req);
 378         }
 379
 380         ret = samdb_rodc(ldb, &rodc);
 381         if (ret != LDB_SUCCESS) {
 382                 DEBUG(4, (__location__ ": unable to tell if we are an RODC \n"));
 383         }
 384
 385         if (!schema->fsmo.we_are_master && !rodc) {
 386                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 387                           "schema_data_modify: we are not master: reject request\n");
 388                 return LDB_ERR_UNWILLING_TO_PERFORM;
 389         }
 390
 391         /*
 392          * normaly the DACL will prevent delete
 393          * with LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS
 394          * above us.
 395          */
 396         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 397                       "schema_data_del: delete is not allowed in the schema\n");
 398         return LDB_ERR_UNWILLING_TO_PERFORM;
 399 }
 400
 401 static int generate_objectClasses(struct ldb_context *ldb, struct ldb_message *msg,
 402                                   const struct dsdb_schema *schema)
 403 {
 404         const struct dsdb_class *sclass;
 405         int ret;
 406
 407         for (sclass = schema->classes; sclass; sclass = sclass->next) {
 408                 char *v = schema_class_to_description(msg, sclass);
 409                 if (v == NULL) {
 410                         return ldb_oom(ldb);
 411                 }
 412                 ret = ldb_msg_add_steal_string(msg, "objectClasses", v);
 413                 if (ret != LDB_SUCCESS) {
 414                         return ret;
 415                 }
 416         }
 417         return LDB_SUCCESS;
 418 }
 419 static int generate_attributeTypes(struct ldb_context *ldb, struct ldb_message *msg,
 420                                   const struct dsdb_schema *schema)
 421 {
 422         const struct dsdb_attribute *attribute;
 423         int ret;
 424
 425         for (attribute = schema->attributes; attribute; attribute = attribute->next) {
 426                 char *v = schema_attribute_to_description(msg, attribute);
 427                 if (v == NULL) {
 428                         return ldb_oom(ldb);
 429                 }
 430                 ret = ldb_msg_add_steal_string(msg, "attributeTypes", v);
 431                 if (ret != LDB_SUCCESS) {
 432                         return ret;
 433                 }
 434         }
 435         return LDB_SUCCESS;
 436 }
 437
 438 static int generate_dITContentRules(struct ldb_context *ldb, struct ldb_message *msg,
 439                                     const struct dsdb_schema *schema)
 440 {
 441         const struct dsdb_class *sclass;
 442         int ret;
 443
 444         for (sclass = schema->classes; sclass; sclass = sclass->next) {
 445                 if (sclass->auxiliaryClass || sclass->systemAuxiliaryClass) {
 446                         char *ditcontentrule = schema_class_to_dITContentRule(msg, sclass, schema);
 447                         if (!ditcontentrule) {
 448                                 return ldb_oom(ldb);
 449                         }
 450                         ret = ldb_msg_add_steal_string(msg, "dITContentRules", ditcontentrule);
 451                         if (ret != LDB_SUCCESS) {
 452                                 return ret;
 453                         }
 454                 }
 455         }
 456         return LDB_SUCCESS;
 457 }
 458
 459 static int generate_extendedAttributeInfo(struct ldb_context *ldb,
 460                                           struct ldb_message *msg,
 461                                           const struct dsdb_schema *schema)
 462 {
 463         const struct dsdb_attribute *attribute;
 464         int ret;
 465
 466         for (attribute = schema->attributes; attribute; attribute = attribute->next) {
 467                 char *val = schema_attribute_to_extendedInfo(msg, attribute);
 468                 if (!val) {
 469                         return ldb_oom(ldb);
 470                 }
 471
 472                 ret = ldb_msg_add_steal_string(msg, "extendedAttributeInfo", val);
 473                 if (ret != LDB_SUCCESS) {
 474                         return ret;
 475                 }
 476         }
 477
 478         return LDB_SUCCESS;
 479 }
 480
 481 static int generate_extendedClassInfo(struct ldb_context *ldb,
 482                                       struct ldb_message *msg,
 483                                       const struct dsdb_schema *schema)
 484 {
 485         const struct dsdb_class *sclass;
 486         int ret;
 487
 488         for (sclass = schema->classes; sclass; sclass = sclass->next) {
 489                 char *val = schema_class_to_extendedInfo(msg, sclass);
 490                 if (!val) {
 491                         return ldb_oom(ldb);
 492                 }
 493
 494                 ret = ldb_msg_add_steal_string(msg, "extendedClassInfo", val);
 495                 if (ret != LDB_SUCCESS) {
 496                         return ret;
 497                 }
 498         }
 499
 500         return LDB_SUCCESS;
 501 }
 502
 503
 504 static int generate_possibleInferiors(struct ldb_context *ldb, struct ldb_message *msg,
 505                                       const struct dsdb_schema *schema)
 506 {
 507         struct ldb_dn *dn = msg->dn;
 508         unsigned int i;
 509         int ret;
 510         const char *first_component_name = ldb_dn_get_component_name(dn, 0);
 511         const struct ldb_val *first_component_val;
 512         const struct dsdb_class *schema_class;
 513         const char **possibleInferiors;
 514
 515         if (strcasecmp(first_component_name, "cn") != 0) {
 516                 return LDB_SUCCESS;
 517         }
 518
 519         first_component_val = ldb_dn_get_component_val(dn, 0);
 520
 521         schema_class = dsdb_class_by_cn_ldb_val(schema, first_component_val);
 522         if (schema_class == NULL) {
 523                 return LDB_SUCCESS;
 524         }
 525
 526         possibleInferiors = schema_class->possibleInferiors;
 527         if (possibleInferiors == NULL) {
 528                 return LDB_SUCCESS;
 529         }
 530
 531         for (i=0;possibleInferiors[i];i++) {
 532                 char *v = talloc_strdup(msg, possibleInferiors[i]);
 533                 if (v == NULL) {
 534                         return ldb_oom(ldb);
 535                 }
 536                 ret = ldb_msg_add_steal_string(msg, "possibleInferiors", v);
 537                 if (ret != LDB_SUCCESS) {
 538                         return ret;
 539                 }
 540         }
 541
 542         return LDB_SUCCESS;
 543 }
 544
 545
 546 /* Add objectClasses, attributeTypes and dITContentRules from the
 547    schema object (they are not stored in the database)
 548  */
 549 static int schema_data_search_callback(struct ldb_request *req, struct ldb_reply *ares)
 550 {
 551         struct ldb_context *ldb;
 552         struct schema_data_search_data *ac;
 553         struct schema_data_private_data *mc;
 554         unsigned int i;
 555         int ret;
 556
 557         ac = talloc_get_type(req->context, struct schema_data_search_data);
 558         mc = talloc_get_type(ldb_module_get_private(ac->module), struct schema_data_private_data);
 559         ldb = ldb_module_get_ctx(ac->module);
 560
 561         if (!ares) {
 562                 return ldb_module_done(ac->req, NULL, NULL,
 563                                         LDB_ERR_OPERATIONS_ERROR);
 564         }
 565         if (ares->error != LDB_SUCCESS) {
 566                 return ldb_module_done(ac->req, ares->controls,
 567                                         ares->response, ares->error);
 568         }
 569         /* Only entries are interesting, and we handle the case of the parent seperatly */
 570
 571         switch (ares->type) {
 572         case LDB_REPLY_ENTRY:
 573
 574                 if (ldb_dn_compare(ares->message->dn, mc->aggregate_dn) == 0) {
 575                         for (i=0; i < ARRAY_SIZE(generated_attrs); i++) {
 576                                 if (generated_attrs[i].aggregate &&
 577                                     ldb_attr_in_list(ac->req->op.search.attrs, generated_attrs[i].attr)) {
 578                                         ret = generated_attrs[i].fn(ldb, ares->message, ac->schema);
 579                                         if (ret != LDB_SUCCESS) {
 580                                                 return ret;
 581                                         }
 582                                 }
 583                         }
 584                 } else if ((ldb_dn_compare_base(mc->schema_dn, ares->message->dn) == 0)
 585                            && (ldb_dn_compare(mc->schema_dn, ares->message->dn) != 0)) {
 586                         for (i=0; i < ARRAY_SIZE(generated_attrs); i++) {
 587                                 if (!generated_attrs[i].aggregate &&
 588                                     ldb_attr_in_list(ac->req->op.search.attrs, generated_attrs[i].attr)) {
 589                                         ret = generated_attrs[i].fn(ldb, ares->message, ac->schema);
 590                                         if (ret != LDB_SUCCESS) {
 591                                                 return ret;
 592                                         }
 593                                 }
 594                         }
 595                 }
 596
 597
 598                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
 599
 600         case LDB_REPLY_REFERRAL:
 601
 602                 return ldb_module_send_referral(ac->req, ares->referral);
 603
 604         case LDB_REPLY_DONE:
 605
 606                 return ldb_module_done(ac->req, ares->controls,
 607                                         ares->response, ares->error);
 608         }
 609
 610         return LDB_SUCCESS;
 611 }
 612
 613 /* search */
 614 static int schema_data_search(struct ldb_module *module, struct ldb_request *req)
 615 {
 616         struct ldb_context *ldb = ldb_module_get_ctx(module);
 617         unsigned int i;
 618         int ret;
 619         struct schema_data_search_data *search_context;
 620         struct ldb_request *down_req;
 621         const struct dsdb_schema *schema;
 622         if (!ldb_module_get_private(module)) {
 623                 /* If there is no module data, there is little we can do */
 624                 return ldb_next_request(module, req);
 625         }
 626
 627         /* The schema manipulation does not apply to special DNs */
 628         if (ldb_dn_is_special(req->op.search.base)) {
 629                 return ldb_next_request(module, req);
 630         }
 631
 632         for (i=0; i < ARRAY_SIZE(generated_attrs); i++) {
 633                 if (ldb_attr_in_list(req->op.search.attrs, generated_attrs[i].attr)) {
 634                         break;
 635                 }
 636         }
 637         if (i == ARRAY_SIZE(generated_attrs)) {
 638                 /* No request for a generated attr found, nothing to
 639                  * see here, move along... */
 640                 return ldb_next_request(module, req);
 641         }
 642
 643         schema = dsdb_get_schema(ldb, NULL);
 644         if (!schema || !ldb_module_get_private(module)) {
 645                 /* If there is no schema, there is little we can do */
 646                 return ldb_next_request(module, req);
 647         }
 648
 649         search_context = talloc(req, struct schema_data_search_data);
 650         if (!search_context) {
 651                 return ldb_oom(ldb);
 652         }
 653
 654         search_context->module = module;
 655         search_context->req = req;
 656         search_context->schema = talloc_reference(search_context, schema);
 657         if (!search_context->schema) {
 658                 return ldb_oom(ldb);
 659         }
 660
 661         ret = ldb_build_search_req_ex(&down_req, ldb, search_context,
 662                                         req->op.search.base,
 663                                         req->op.search.scope,
 664                                         req->op.search.tree,
 665                                         req->op.search.attrs,
 666                                         req->controls,
 667                                         search_context, schema_data_search_callback,
 668                                         req);
 669         LDB_REQ_SET_LOCATION(down_req);
 670         if (ret != LDB_SUCCESS) {
 671                 return ldb_operr(ldb);
 672         }
 673
 674         return ldb_next_request(module, down_req);
 675 }
 676
 677
 678 static const struct ldb_module_ops ldb_schema_data_module_ops = {
 679         .name           = "schema_data",
 680         .init_context   = schema_data_init,
 681         .add            = schema_data_add,
 682         .modify         = schema_data_modify,
 683         .del            = schema_data_del,
 684         .search         = schema_data_search
 685 };
 686
 687 int ldb_schema_data_module_init(const char *version)
 688 {
 689         LDB_MODULE_CHECK_VERSION(version);
 690         return ldb_register_module(&ldb_schema_data_module_ops);
 691 }