source4/dsdb/samdb/ldb_modules/objectclass.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2006-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2007
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 /*
  22  *  Name: ldb
  23  *
  24  *  Component: objectClass sorting module
  25  *
  26  *  Description:
  27  *  - sort the objectClass attribute into the class
  28  *    hierarchy,
  29  *  - fix DNs and attributes into 'standard' case
  30  *  - Add objectCategory and ntSecurityDescriptor defaults
  31  *
  32  *  Author: Andrew Bartlett
  33  */
  34
  35
  36 #include "includes.h"
  37 #include "ldb_module.h"
  38 #include "dlinklist.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "librpc/ndr/libndr.h"
  41 #include "librpc/gen_ndr/ndr_security.h"
  42 #include "libcli/security/security.h"
  43 #include "auth/auth.h"
  44 #include "param/param.h"
  45
  46 struct oc_context {
  47
  48         struct ldb_module *module;
  49         struct ldb_request *req;
  50
  51         struct ldb_reply *search_res;
  52
  53         int (*step_fn)(struct oc_context *);
  54 };
  55
  56 struct class_list {
  57         struct class_list *prev, *next;
  58         const struct dsdb_class *objectclass;
  59 };
  60
  61 static struct oc_context *oc_init_context(struct ldb_module *module,
  62                                           struct ldb_request *req)
  63 {
  64         struct ldb_context *ldb;
  65         struct oc_context *ac;
  66
  67         ldb = ldb_module_get_ctx(module);
  68
  69         ac = talloc_zero(req, struct oc_context);
  70         if (ac == NULL) {
  71                 ldb_set_errstring(ldb, "Out of Memory");
  72                 return NULL;
  73         }
  74
  75         ac->module = module;
  76         ac->req = req;
  77
  78         return ac;
  79 }
  80
  81 static int objectclass_do_add(struct oc_context *ac);
  82
  83 /* Sort objectClasses into correct order, and validate that all
  84  * objectClasses specified actually exist in the schema
  85  */
  86
  87 static int objectclass_sort(struct ldb_module *module,
  88                             const struct dsdb_schema *schema,
  89                             TALLOC_CTX *mem_ctx,
  90                             struct ldb_message_element *objectclass_element,
  91                             struct class_list **sorted_out)
  92 {
  93         struct ldb_context *ldb;
  94         int i;
  95         int layer;
  96         struct class_list *sorted = NULL, *parent_class = NULL,
  97                 *subclass = NULL, *unsorted = NULL, *current, *poss_subclass, *poss_parent, *new_parent;
  98
  99         ldb = ldb_module_get_ctx(module);
 100
 101         /* DESIGN:
 102          *
 103          * We work on 4 different 'bins' (implemented here as linked lists):
 104          *
 105          * * sorted:       the eventual list, in the order we wish to push
 106          *                 into the database.  This is the only ordered list.
 107          *
 108          * * parent_class: The current parent class 'bin' we are
 109          *                 trying to find subclasses for
 110          *
 111          * * subclass:     The subclasses we have found so far
 112          *
 113          * * unsorted:     The remaining objectClasses
 114          *
 115          * The process is a matter of filtering objectClasses up from
 116          * unsorted into sorted.  Order is irrelevent in the later 3 'bins'.
 117          *
 118          * We start with 'top' (found and promoted to parent_class
 119          * initially).  Then we find (in unsorted) all the direct
 120          * subclasses of 'top'.  parent_classes is concatenated onto
 121          * the end of 'sorted', and subclass becomes the list in
 122          * parent_class.
 123          *
 124          * We then repeat, until we find no more subclasses.  Any left
 125          * over classes are added to the end.
 126          *
 127          */
 128
 129         /* Firstly, dump all the objectClass elements into the
 130          * unsorted bin, except for 'top', which is special */
 131         for (i=0; i < objectclass_element->num_values; i++) {
 132                 current = talloc(mem_ctx, struct class_list);
 133                 if (!current) {
 134                         ldb_oom(ldb);
 135                         return LDB_ERR_OPERATIONS_ERROR;
 136                 }
 137                 current->objectclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &objectclass_element->values[i]);
 138                 if (!current->objectclass) {
 139                         ldb_asprintf_errstring(ldb, "objectclass %.*s is not a valid objectClass in schema",
 140                                                (int)objectclass_element->values[i].length, (const char *)objectclass_element->values[i].data);
 141                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
 142                 }
 143
 144                 /* this is the root of the tree.  We will start
 145                  * looking for subclasses from here */
 146                 if (ldb_attr_cmp("top", current->objectclass->lDAPDisplayName) == 0) {
 147                         DLIST_ADD_END(parent_class, current, struct class_list *);
 148                 } else {
 149                         DLIST_ADD_END(unsorted, current, struct class_list *);
 150                 }
 151         }
 152
 153         if (parent_class == NULL) {
 154                 current = talloc(mem_ctx, struct class_list);
 155                 current->objectclass = dsdb_class_by_lDAPDisplayName(schema, "top");
 156                 DLIST_ADD_END(parent_class, current, struct class_list *);
 157         }
 158
 159         /* For each object:  find parent chain */
 160         for (current = unsorted; schema && current; current = current->next) {
 161                 for (poss_parent = unsorted; poss_parent; poss_parent = poss_parent->next) {
 162                         if (ldb_attr_cmp(poss_parent->objectclass->lDAPDisplayName, current->objectclass->subClassOf) == 0) {
 163                                 break;
 164                         }
 165                 }
 166                 /* If we didn't get to the end of the list, we need to add this parent */
 167                 if (poss_parent || (ldb_attr_cmp("top", current->objectclass->subClassOf) == 0)) {
 168                         continue;
 169                 }
 170
 171                 new_parent = talloc(mem_ctx, struct class_list);
 172                 new_parent->objectclass = dsdb_class_by_lDAPDisplayName(schema, current->objectclass->subClassOf);
 173                 DLIST_ADD_END(unsorted, new_parent, struct class_list *);
 174         }
 175
 176         /* DEBUGGING aid:  how many layers are we down now? */
 177         layer = 0;
 178         do {
 179                 layer++;
 180                 /* Find all the subclasses of classes in the
 181                  * parent_classes.  Push them onto the subclass list */
 182
 183                 /* Ensure we don't bother if there are no unsorted entries left */
 184                 for (current = parent_class; schema && unsorted && current; current = current->next) {
 185                         /* Walk the list of possible subclasses in unsorted */
 186                         for (poss_subclass = unsorted; poss_subclass; ) {
 187                                 struct class_list *next;
 188
 189                                 /* Save the next pointer, as the DLIST_ macros will change poss_subclass->next */
 190                                 next = poss_subclass->next;
 191
 192                                 if (ldb_attr_cmp(poss_subclass->objectclass->subClassOf, current->objectclass->lDAPDisplayName) == 0) {
 193                                         DLIST_REMOVE(unsorted, poss_subclass);
 194                                         DLIST_ADD(subclass, poss_subclass);
 195
 196                                         break;
 197                                 }
 198                                 poss_subclass = next;
 199                         }
 200                 }
 201
 202                 /* Now push the parent_classes as sorted, we are done with
 203                 these.  Add to the END of the list by concatenation */
 204                 DLIST_CONCATENATE(sorted, parent_class, struct class_list *);
 205
 206                 /* and now find subclasses of these */
 207                 parent_class = subclass;
 208                 subclass = NULL;
 209
 210                 /* If we didn't find any subclasses we will fall out
 211                  * the bottom here */
 212         } while (parent_class);
 213
 214         if (!unsorted) {
 215                 *sorted_out = sorted;
 216                 return LDB_SUCCESS;
 217         }
 218
 219         if (!schema) {
 220                 /* If we don't have schema yet, then just merge the lists again */
 221                 DLIST_CONCATENATE(sorted, unsorted, struct class_list *);
 222                 *sorted_out = sorted;
 223                 return LDB_SUCCESS;
 224         }
 225
 226         /* This shouldn't happen, and would break MMC, perhaps there
 227          * was no 'top', a conflict in the objectClasses or some other
 228          * schema error?
 229          */
 230         ldb_asprintf_errstring(ldb, "objectclass %s is not a valid objectClass in objectClass chain", unsorted->objectclass->lDAPDisplayName);
 231         return LDB_ERR_OBJECT_CLASS_VIOLATION;
 232 }
 233
 234 static int get_search_callback(struct ldb_request *req, struct ldb_reply *ares)
 235 {
 236         struct ldb_context *ldb;
 237         struct oc_context *ac;
 238         int ret;
 239
 240         ac = talloc_get_type(req->context, struct oc_context);
 241         ldb = ldb_module_get_ctx(ac->module);
 242
 243         if (!ares) {
 244                 return ldb_module_done(ac->req, NULL, NULL,
 245                                         LDB_ERR_OPERATIONS_ERROR);
 246         }
 247         if (ares->error != LDB_SUCCESS &&
 248             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
 249                 return ldb_module_done(ac->req, ares->controls,
 250                                         ares->response, ares->error);
 251         }
 252
 253         ldb_reset_err_string(ldb);
 254
 255         switch (ares->type) {
 256         case LDB_REPLY_ENTRY:
 257                 if (ac->search_res != NULL) {
 258                         ldb_set_errstring(ldb, "Too many results");
 259                         talloc_free(ares);
 260                         return ldb_module_done(ac->req, NULL, NULL,
 261                                                 LDB_ERR_OPERATIONS_ERROR);
 262                 }
 263
 264                 ac->search_res = talloc_steal(ac, ares);
 265                 break;
 266
 267         case LDB_REPLY_REFERRAL:
 268                 /* ignore */
 269                 talloc_free(ares);
 270                 break;
 271
 272         case LDB_REPLY_DONE:
 273                 talloc_free(ares);
 274                 ret = ac->step_fn(ac);
 275                 if (ret != LDB_SUCCESS) {
 276                         return ldb_module_done(ac->req, NULL, NULL, ret);
 277                 }
 278                 break;
 279         }
 280
 281         return LDB_SUCCESS;
 282 }
 283
 284 static int oc_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 285 {
 286         struct oc_context *ac;
 287
 288         ac = talloc_get_type(req->context, struct oc_context);
 289
 290         if (!ares) {
 291                 return ldb_module_done(ac->req, NULL, NULL,
 292                                         LDB_ERR_OPERATIONS_ERROR);
 293         }
 294         if (ares->error != LDB_SUCCESS) {
 295                 return ldb_module_done(ac->req, ares->controls,
 296                                         ares->response, ares->error);
 297         }
 298
 299         if (ares->type != LDB_REPLY_DONE) {
 300                 talloc_free(ares);
 301                 return ldb_module_done(ac->req, NULL, NULL,
 302                                         LDB_ERR_OPERATIONS_ERROR);
 303         }
 304
 305         return ldb_module_done(ac->req, ares->controls,
 306                                 ares->response, ares->error);
 307 }
 308
 309 /* Fix up the DN to be in the standard form, taking particular care to match the parent DN
 310
 311    This should mean that if the parent is:
 312     CN=Users,DC=samba,DC=example,DC=com
 313    and a proposed child is
 314     cn=Admins ,cn=USERS,dc=Samba,dc=example,dc=COM
 315
 316    The resulting DN should be:
 317
 318     CN=Admins,CN=Users,DC=samba,DC=example,DC=com
 319
 320  */
 321 static int fix_dn(TALLOC_CTX *mem_ctx,
 322                   struct ldb_dn *newdn, struct ldb_dn *parent_dn,
 323                   struct ldb_dn **fixed_dn)
 324 {
 325         char *upper_rdn_attr;
 326         /* Fix up the DN to be in the standard form, taking particular care to match the parent DN */
 327         *fixed_dn = ldb_dn_copy(mem_ctx, parent_dn);
 328
 329         /* We need the attribute name in upper case */
 330         upper_rdn_attr = strupper_talloc(*fixed_dn,
 331                                          ldb_dn_get_rdn_name(newdn));
 332         if (!upper_rdn_attr) {
 333                 return LDB_ERR_OPERATIONS_ERROR;
 334         }
 335
 336         /* Create a new child */
 337         if (ldb_dn_add_child_fmt(*fixed_dn, "X=X") == false) {
 338                 return LDB_ERR_OPERATIONS_ERROR;
 339         }
 340
 341         /* And replace it with CN=foo (we need the attribute in upper case */
 342         return ldb_dn_set_component(*fixed_dn, 0, upper_rdn_attr,
 343                                     *ldb_dn_get_rdn_val(newdn));
 344 }
 345
 346 /* Fix all attribute names to be in the correct case, and check they are all valid per the schema */
 347 static int fix_attributes(struct ldb_context *ldb, const struct dsdb_schema *schema, struct ldb_message *msg)
 348 {
 349         int i;
 350         for (i=0; i < msg->num_elements; i++) {
 351                 const struct dsdb_attribute *attribute = dsdb_attribute_by_lDAPDisplayName(schema, msg->elements[i].name);
 352                 /* Add in a very special case for 'clearTextPassword',
 353                  * which is used for internal processing only, and is
 354                  * not presented in the schema */
 355                 if (!attribute) {
 356                         if (strcasecmp(msg->elements[i].name, "clearTextPassword") != 0) {
 357                                 ldb_asprintf_errstring(ldb, "attribute %s is not a valid attribute in schema", msg->elements[i].name);
 358                                 return LDB_ERR_UNDEFINED_ATTRIBUTE_TYPE;
 359                         }
 360                 } else {
 361                         msg->elements[i].name = attribute->lDAPDisplayName;
 362                 }
 363         }
 364
 365         return LDB_SUCCESS;
 366 }
 367
 368 static int objectclass_do_add(struct oc_context *ac);
 369
 370 static int objectclass_add(struct ldb_module *module, struct ldb_request *req)
 371 {
 372         struct ldb_context *ldb;
 373         struct ldb_request *search_req;
 374         struct oc_context *ac;
 375         struct ldb_dn *parent_dn;
 376         int ret;
 377         static const char * const parent_attrs[] = { "objectGUID", NULL };
 378
 379         ldb = ldb_module_get_ctx(module);
 380
 381         ldb_debug(ldb, LDB_DEBUG_TRACE, "objectclass_add\n");
 382
 383         /* do not manipulate our control entries */
 384         if (ldb_dn_is_special(req->op.add.message->dn)) {
 385                 return ldb_next_request(module, req);
 386         }
 387
 388         /* the objectClass must be specified on add */
 389         if (ldb_msg_find_element(req->op.add.message,
 390                                  "objectClass") == NULL) {
 391                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
 392         }
 393
 394         ac = oc_init_context(module, req);
 395         if (ac == NULL) {
 396                 return LDB_ERR_OPERATIONS_ERROR;
 397         }
 398
 399         /* If there isn't a parent, just go on to the add processing */
 400         if (ldb_dn_get_comp_num(ac->req->op.add.message->dn) == 1) {
 401                 return objectclass_do_add(ac);
 402         }
 403
 404         /* get copy of parent DN */
 405         parent_dn = ldb_dn_get_parent(ac, ac->req->op.add.message->dn);
 406         if (parent_dn == NULL) {
 407                 ldb_oom(ldb);
 408                 return LDB_ERR_OPERATIONS_ERROR;
 409         }
 410
 411         ret = ldb_build_search_req(&search_req, ldb,
 412                                    ac, parent_dn, LDB_SCOPE_BASE,
 413                                    "(objectClass=*)", parent_attrs,
 414                                    NULL,
 415                                    ac, get_search_callback,
 416                                    req);
 417         if (ret != LDB_SUCCESS) {
 418                 return ret;
 419         }
 420         talloc_steal(search_req, parent_dn);
 421
 422         ac->step_fn = objectclass_do_add;
 423
 424         return ldb_next_request(ac->module, search_req);
 425 }
 426
 427 static int objectclass_do_add(struct oc_context *ac)
 428 {
 429         struct ldb_context *ldb;
 430         const struct dsdb_schema *schema;
 431         struct ldb_request *add_req;
 432         char *value;
 433         struct ldb_message_element *objectclass_element;
 434         struct ldb_message *msg;
 435         TALLOC_CTX *mem_ctx;
 436         struct class_list *sorted, *current;
 437         int ret;
 438
 439         ldb = ldb_module_get_ctx(ac->module);
 440         schema = dsdb_get_schema(ldb);
 441
 442         mem_ctx = talloc_new(ac);
 443         if (mem_ctx == NULL) {
 444                 return LDB_ERR_OPERATIONS_ERROR;
 445         }
 446
 447         msg = ldb_msg_copy_shallow(ac, ac->req->op.add.message);
 448
 449         /* Check we have a valid parent */
 450         if (ac->search_res == NULL) {
 451                 if (ldb_dn_compare(ldb_get_root_basedn(ldb),
 452                                                                 msg->dn) == 0) {
 453                         /* Allow the tree to be started */
 454
 455                         /* but don't keep any error string, it's meaningless */
 456                         ldb_set_errstring(ldb, NULL);
 457                 } else {
 458                         ldb_asprintf_errstring(ldb, "objectclass: Cannot add %s, parent does not exist!",
 459                                                ldb_dn_get_linearized(msg->dn));
 460                         talloc_free(mem_ctx);
 461                         return LDB_ERR_UNWILLING_TO_PERFORM;
 462                 }
 463         } else {
 464                 const struct ldb_val *parent_guid;
 465
 466                 /* Fix up the DN to be in the standard form, taking particular care to match the parent DN */
 467                 ret = fix_dn(msg,
 468                              ac->req->op.add.message->dn,
 469                              ac->search_res->message->dn,
 470                              &msg->dn);
 471
 472                 if (ret != LDB_SUCCESS) {
 473                         ldb_asprintf_errstring(ldb, "Could not munge DN %s into normal form",
 474                                                ldb_dn_get_linearized(ac->req->op.add.message->dn));
 475                         talloc_free(mem_ctx);
 476                         return ret;
 477                 }
 478
 479                 parent_guid = ldb_msg_find_ldb_val(ac->search_res->message, "objectGUID");
 480                 if (parent_guid == NULL) {
 481                         ldb_asprintf_errstring(ldb, "objectclass: Cannot add %s, parent does not have an objectGUID!",
 482                                                ldb_dn_get_linearized(msg->dn));
 483                         talloc_free(mem_ctx);
 484                         return LDB_ERR_UNWILLING_TO_PERFORM;
 485                 }
 486
 487                 /* TODO: Check this is a valid child to this parent,
 488                  * by reading the allowedChildClasses and
 489                  * allowedChildClasssesEffective attributes */
 490                 ret = ldb_msg_add_steal_value(msg, "parentGUID", discard_const(parent_guid));
 491                 if (ret != LDB_SUCCESS) {
 492                         ldb_asprintf_errstring(ldb, "objectclass: Cannot add %s, failed to add parentGUID",
 493                                                ldb_dn_get_linearized(msg->dn));
 494                         talloc_free(mem_ctx);
 495                         return LDB_ERR_UNWILLING_TO_PERFORM;
 496                 }
 497         }
 498         if (schema) {
 499                 ret = fix_attributes(ldb, schema, msg);
 500                 if (ret != LDB_SUCCESS) {
 501                         talloc_free(mem_ctx);
 502                         return ret;
 503                 }
 504
 505                 /* This is now the objectClass list from the database */
 506                 objectclass_element = ldb_msg_find_element(msg, "objectClass");
 507
 508                 if (!objectclass_element) {
 509                         /* Where did it go?  bail now... */
 510                         talloc_free(mem_ctx);
 511                         return LDB_ERR_OPERATIONS_ERROR;
 512                 }
 513                 ret = objectclass_sort(ac->module, schema, mem_ctx, objectclass_element, &sorted);
 514                 if (ret != LDB_SUCCESS) {
 515                         talloc_free(mem_ctx);
 516                         return ret;
 517                 }
 518
 519                 ldb_msg_remove_attr(msg, "objectClass");
 520                 ret = ldb_msg_add_empty(msg, "objectClass", 0, NULL);
 521
 522                 if (ret != LDB_SUCCESS) {
 523                         talloc_free(mem_ctx);
 524                         return ret;
 525                 }
 526
 527                 /* We must completely replace the existing objectClass entry,
 528                  * because we need it sorted */
 529
 530                 /* Move from the linked list back into an ldb msg */
 531                 for (current = sorted; current; current = current->next) {
 532                         value = talloc_strdup(msg, current->objectclass->lDAPDisplayName);
 533                         if (value == NULL) {
 534                                 ldb_oom(ldb);
 535                                 talloc_free(mem_ctx);
 536                                 return LDB_ERR_OPERATIONS_ERROR;
 537                         }
 538                         ret = ldb_msg_add_string(msg, "objectClass", value);
 539                         if (ret != LDB_SUCCESS) {
 540                                 ldb_set_errstring(ldb,
 541                                                   "objectclass: could not re-add sorted "
 542                                                   "objectclass to modify msg");
 543                                 talloc_free(mem_ctx);
 544                                 return ret;
 545                         }
 546                         /* Last one is the critical one */
 547                         if (!current->next) {
 548                                 struct ldb_message_element *el;
 549                                 int32_t systemFlags = 0;
 550                                 DATA_BLOB *sd;
 551                                 if (!ldb_msg_find_element(msg, "objectCategory")) {
 552                                         value = talloc_strdup(msg, current->objectclass->defaultObjectCategory);
 553                                         if (value == NULL) {
 554                                                 ldb_oom(ldb);
 555                                                 talloc_free(mem_ctx);
 556                                                 return LDB_ERR_OPERATIONS_ERROR;
 557                                         }
 558                                         ldb_msg_add_string(msg, "objectCategory", value);
 559                                 }
 560                                 if (!ldb_msg_find_element(msg, "showInAdvancedViewOnly") && (current->objectclass->defaultHidingValue == true)) {
 561                                         ldb_msg_add_string(msg, "showInAdvancedViewOnly",
 562                                                            "TRUE");
 563                                 }
 564
 565                                 /* There are very special rules for systemFlags, see MS-ADTS 3.1.1.5.2.4 */
 566                                 el = ldb_msg_find_element(msg, "systemFlags");
 567
 568                                 systemFlags = ldb_msg_find_attr_as_int(msg, "systemFlags", 0);
 569
 570                                 if (el) {
 571                                         /* Only these flags may be set by a client, but we can't tell between a client and our provision at this point */
 572                                         /* systemFlags &= ( SYSTEM_FLAG_CONFIG_ALLOW_RENAME | SYSTEM_FLAG_CONFIG_ALLOW_MOVE | SYSTEM_FLAG_CONFIG_LIMITED_MOVE); */
 573                                         ldb_msg_remove_element(msg, el);
 574                                 }
 575
 576                                 /* This flag is only allowed on attributeSchema objects */
 577                                 if (ldb_attr_cmp(current->objectclass->lDAPDisplayName, "attributeSchema") == 0) {
 578                                         systemFlags &= ~SYSTEM_FLAG_ATTR_IS_RDN;
 579                                 }
 580
 581                                 if (ldb_attr_cmp(current->objectclass->lDAPDisplayName, "server") == 0) {
 582                                         systemFlags |= (int32_t)(SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE | SYSTEM_FLAG_CONFIG_ALLOW_RENAME | SYSTEM_FLAG_CONFIG_ALLOW_LIMITED_MOVE);
 583                                 } else if (ldb_attr_cmp(current->objectclass->lDAPDisplayName, "site") == 0
 584                                            || ldb_attr_cmp(current->objectclass->lDAPDisplayName, "serverContainer") == 0
 585                                            || ldb_attr_cmp(current->objectclass->lDAPDisplayName, "ntDSDSA") == 0) {
 586                                         systemFlags |= (int32_t)(SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE);
 587
 588                                 } else if (ldb_attr_cmp(current->objectclass->lDAPDisplayName, "siteLink") == 0
 589                                            || ldb_attr_cmp(current->objectclass->lDAPDisplayName, "siteLinkBridge") == 0
 590                                            || ldb_attr_cmp(current->objectclass->lDAPDisplayName, "nTDSConnection") == 0) {
 591                                         systemFlags |= (int32_t)(SYSTEM_FLAG_CONFIG_ALLOW_RENAME);
 592                                 }
 593
 594                                 /* TODO: If parent object is site or subnet, also add (SYSTEM_FLAG_CONFIG_ALLOW_RENAME) */
 595
 596                                 if (el || systemFlags != 0) {
 597                                         samdb_msg_add_int(ldb, msg, msg, "systemFlags", systemFlags);
 598                                 }
 599                         }
 600                 }
 601         }
 602
 603         talloc_free(mem_ctx);
 604         ret = ldb_msg_sanity_check(ldb, msg);
 605
 606
 607         if (ret != LDB_SUCCESS) {
 608                 return ret;
 609         }
 610
 611         ret = ldb_build_add_req(&add_req, ldb, ac,
 612                                 msg,
 613                                 ac->req->controls,
 614                                 ac, oc_op_callback,
 615                                 ac->req);
 616         if (ret != LDB_SUCCESS) {
 617                 return ret;
 618         }
 619
 620         /* perform the add */
 621         return ldb_next_request(ac->module, add_req);
 622 }
 623
 624 static int oc_modify_callback(struct ldb_request *req,
 625                                 struct ldb_reply *ares);
 626 static int objectclass_do_mod(struct oc_context *ac);
 627
 628 static int objectclass_modify(struct ldb_module *module, struct ldb_request *req)
 629 {
 630         struct ldb_context *ldb = ldb_module_get_ctx(module);
 631         struct ldb_message_element *objectclass_element;
 632         struct ldb_message *msg;
 633         const struct dsdb_schema *schema = dsdb_get_schema(ldb);
 634         struct class_list *sorted, *current;
 635         struct ldb_request *down_req;
 636         struct oc_context *ac;
 637         TALLOC_CTX *mem_ctx;
 638         char *value;
 639         int ret;
 640
 641         ldb_debug(ldb, LDB_DEBUG_TRACE, "objectclass_modify\n");
 642
 643         /* do not manipulate our control entries */
 644         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 645                 return ldb_next_request(module, req);
 646         }
 647
 648         /* Without schema, there isn't much to do here */
 649         if (!schema) {
 650                 return ldb_next_request(module, req);
 651         }
 652         objectclass_element = ldb_msg_find_element(req->op.mod.message, "objectClass");
 653
 654         ac = oc_init_context(module, req);
 655         if (ac == NULL) {
 656                 return LDB_ERR_OPERATIONS_ERROR;
 657         }
 658
 659         /* If no part of this touches the objectClass, then we don't
 660          * need to make any changes.  */
 661
 662         /* If the only operation is the deletion of the objectClass
 663          * then go on with just fixing the attribute case */
 664         if (!objectclass_element) {
 665                 msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
 666                 if (msg == NULL) {
 667                         return LDB_ERR_OPERATIONS_ERROR;
 668                 }
 669
 670                 ret = fix_attributes(ldb, schema, msg);
 671                 if (ret != LDB_SUCCESS) {
 672                         return ret;
 673                 }
 674
 675                 ret = ldb_build_mod_req(&down_req, ldb, ac,
 676                                         msg,
 677                                         req->controls,
 678                                         ac, oc_op_callback,
 679                                         req);
 680                 if (ret != LDB_SUCCESS) {
 681                         return ret;
 682                 }
 683
 684                 /* go on with the call chain */
 685                 return ldb_next_request(module, down_req);
 686         }
 687
 688         switch (objectclass_element->flags & LDB_FLAG_MOD_MASK) {
 689         case LDB_FLAG_MOD_DELETE:
 690                 if (objectclass_element->num_values == 0) {
 691                         return LDB_ERR_OBJECT_CLASS_MODS_PROHIBITED;
 692                 }
 693                 break;
 694
 695         case LDB_FLAG_MOD_REPLACE:
 696                 mem_ctx = talloc_new(ac);
 697                 if (mem_ctx == NULL) {
 698                         return LDB_ERR_OPERATIONS_ERROR;
 699                 }
 700
 701                 msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
 702                 if (msg == NULL) {
 703                         talloc_free(mem_ctx);
 704                         return LDB_ERR_OPERATIONS_ERROR;
 705                 }
 706
 707                 ret = fix_attributes(ldb, schema, msg);
 708                 if (ret != LDB_SUCCESS) {
 709                         talloc_free(mem_ctx);
 710                         return ret;
 711                 }
 712
 713                 ret = objectclass_sort(module, schema, mem_ctx, objectclass_element, &sorted);
 714                 if (ret != LDB_SUCCESS) {
 715                         talloc_free(mem_ctx);
 716                         return ret;
 717                 }
 718
 719                 /* We must completely replace the existing objectClass entry,
 720                  * because we need it sorted */
 721
 722                 ldb_msg_remove_attr(msg, "objectClass");
 723                 ret = ldb_msg_add_empty(msg, "objectClass", LDB_FLAG_MOD_REPLACE, NULL);
 724
 725                 if (ret != LDB_SUCCESS) {
 726                         talloc_free(mem_ctx);
 727                         return ret;
 728                 }
 729
 730                 /* Move from the linked list back into an ldb msg */
 731                 for (current = sorted; current; current = current->next) {
 732                         /* copy the value as this string is on the schema
 733                          * context and we can't rely on it not changing
 734                          * before the operation is over */
 735                         value = talloc_strdup(msg,
 736                                         current->objectclass->lDAPDisplayName);
 737                         if (value == NULL) {
 738                                 ldb_oom(ldb);
 739                                 talloc_free(mem_ctx);
 740                                 return LDB_ERR_OPERATIONS_ERROR;
 741                         }
 742                         ret = ldb_msg_add_string(msg, "objectClass", value);
 743                         if (ret != LDB_SUCCESS) {
 744                                 ldb_set_errstring(ldb,
 745                                         "objectclass: could not re-add sorted "
 746                                         "objectclass to modify msg");
 747                                 talloc_free(mem_ctx);
 748                                 return ret;
 749                         }
 750                 }
 751
 752                 talloc_free(mem_ctx);
 753
 754                 ret = ldb_msg_sanity_check(ldb, msg);
 755                 if (ret != LDB_SUCCESS) {
 756                         return ret;
 757                 }
 758
 759                 ret = ldb_build_mod_req(&down_req, ldb, ac,
 760                                         msg,
 761                                         req->controls,
 762                                         ac, oc_op_callback,
 763                                         req);
 764                 if (ret != LDB_SUCCESS) {
 765                         return ret;
 766                 }
 767
 768                 /* go on with the call chain */
 769                 return ldb_next_request(module, down_req);
 770         }
 771
 772         /* This isn't the default branch of the switch, but a 'in any
 773          * other case'.  When a delete isn't for all objectClasses for
 774          * example
 775          */
 776
 777         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
 778         if (msg == NULL) {
 779                 ldb_oom(ldb);
 780                 return LDB_ERR_OPERATIONS_ERROR;
 781         }
 782
 783         ret = fix_attributes(ldb, schema, msg);
 784         if (ret != LDB_SUCCESS) {
 785                 ldb_oom(ldb);
 786                 return ret;
 787         }
 788
 789         ret = ldb_build_mod_req(&down_req, ldb, ac,
 790                                 msg,
 791                                 req->controls,
 792                                 ac, oc_modify_callback,
 793                                 req);
 794         if (ret != LDB_SUCCESS) {
 795                 return ret;
 796         }
 797
 798         return ldb_next_request(module, down_req);
 799 }
 800
 801 static int oc_modify_callback(struct ldb_request *req, struct ldb_reply *ares)
 802 {
 803         struct ldb_context *ldb;
 804         static const char * const attrs[] = { "objectClass", NULL };
 805         struct ldb_request *search_req;
 806         struct oc_context *ac;
 807         int ret;
 808
 809         ac = talloc_get_type(req->context, struct oc_context);
 810         ldb = ldb_module_get_ctx(ac->module);
 811
 812         if (!ares) {
 813                 return ldb_module_done(ac->req, NULL, NULL,
 814                                         LDB_ERR_OPERATIONS_ERROR);
 815         }
 816         if (ares->error != LDB_SUCCESS) {
 817                 return ldb_module_done(ac->req, ares->controls,
 818                                         ares->response, ares->error);
 819         }
 820
 821         if (ares->type != LDB_REPLY_DONE) {
 822                 talloc_free(ares);
 823                 return ldb_module_done(ac->req, NULL, NULL,
 824                                         LDB_ERR_OPERATIONS_ERROR);
 825         }
 826
 827         ret = ldb_build_search_req(&search_req, ldb, ac,
 828                                    ac->req->op.mod.message->dn, LDB_SCOPE_BASE,
 829                                    "(objectClass=*)",
 830                                    attrs, NULL,
 831                                    ac, get_search_callback,
 832                                    ac->req);
 833         if (ret != LDB_SUCCESS) {
 834                 return ldb_module_done(ac->req, NULL, NULL, ret);
 835         }
 836
 837         ac->step_fn = objectclass_do_mod;
 838
 839         ret = ldb_next_request(ac->module, search_req);
 840         if (ret != LDB_SUCCESS) {
 841                 return ldb_module_done(ac->req, NULL, NULL, ret);
 842         }
 843         return LDB_SUCCESS;
 844 }
 845
 846 static int objectclass_do_mod(struct oc_context *ac)
 847 {
 848         struct ldb_context *ldb;
 849         const struct dsdb_schema *schema;
 850         struct ldb_request *mod_req;
 851         char *value;
 852         struct ldb_message_element *objectclass_element;
 853         struct ldb_message *msg;
 854         TALLOC_CTX *mem_ctx;
 855         struct class_list *sorted, *current;
 856         int ret;
 857
 858         ldb = ldb_module_get_ctx(ac->module);
 859
 860         if (ac->search_res == NULL) {
 861                 return LDB_ERR_OPERATIONS_ERROR;
 862         }
 863         schema = dsdb_get_schema(ldb);
 864
 865         mem_ctx = talloc_new(ac);
 866         if (mem_ctx == NULL) {
 867                 return LDB_ERR_OPERATIONS_ERROR;
 868         }
 869
 870         /* use a new message structure */
 871         msg = ldb_msg_new(ac);
 872         if (msg == NULL) {
 873                 ldb_set_errstring(ldb,
 874                         "objectclass: could not create new modify msg");
 875                 talloc_free(mem_ctx);
 876                 return LDB_ERR_OPERATIONS_ERROR;
 877         }
 878
 879         /* This is now the objectClass list from the database */
 880         objectclass_element = ldb_msg_find_element(ac->search_res->message,
 881                                                    "objectClass");
 882         if (!objectclass_element) {
 883                 /* Where did it go?  bail now... */
 884                 talloc_free(mem_ctx);
 885                 return LDB_ERR_OPERATIONS_ERROR;
 886         }
 887
 888         /* modify dn */
 889         msg->dn = ac->req->op.mod.message->dn;
 890
 891         ret = objectclass_sort(ac->module, schema, mem_ctx, objectclass_element, &sorted);
 892         if (ret != LDB_SUCCESS) {
 893                 return ret;
 894         }
 895
 896         /* We must completely replace the existing objectClass entry.
 897          * We could do a constrained add/del, but we are meant to be
 898          * in a transaction... */
 899
 900         ret = ldb_msg_add_empty(msg, "objectClass", LDB_FLAG_MOD_REPLACE, NULL);
 901         if (ret != LDB_SUCCESS) {
 902                 ldb_set_errstring(ldb, "objectclass: could not clear objectclass in modify msg");
 903                 talloc_free(mem_ctx);
 904                 return ret;
 905         }
 906
 907         /* Move from the linked list back into an ldb msg */
 908         for (current = sorted; current; current = current->next) {
 909                 value = talloc_strdup(msg, current->objectclass->lDAPDisplayName);
 910                 if (value == NULL) {
 911                         ldb_oom(ldb);
 912                         return LDB_ERR_OPERATIONS_ERROR;
 913                 }
 914                 ret = ldb_msg_add_string(msg, "objectClass", value);
 915                 if (ret != LDB_SUCCESS) {
 916                         ldb_set_errstring(ldb, "objectclass: could not re-add sorted objectclass to modify msg");
 917                         talloc_free(mem_ctx);
 918                         return ret;
 919                 }
 920         }
 921
 922         ret = ldb_msg_sanity_check(ldb, msg);
 923         if (ret != LDB_SUCCESS) {
 924                 talloc_free(mem_ctx);
 925                 return ret;
 926         }
 927
 928         ret = ldb_build_mod_req(&mod_req, ldb, ac,
 929                                 msg,
 930                                 ac->req->controls,
 931                                 ac, oc_op_callback,
 932                                 ac->req);
 933         if (ret != LDB_SUCCESS) {
 934                 talloc_free(mem_ctx);
 935                 return ret;
 936         }
 937
 938         talloc_free(mem_ctx);
 939         /* perform the modify */
 940         return ldb_next_request(ac->module, mod_req);
 941 }
 942
 943 static int objectclass_do_rename(struct oc_context *ac);
 944
 945 static int objectclass_rename(struct ldb_module *module, struct ldb_request *req)
 946 {
 947         static const char * const attrs[] = { "objectGUID", NULL };
 948         struct ldb_context *ldb;
 949         struct ldb_request *search_req;
 950         struct oc_context *ac;
 951         struct ldb_dn *parent_dn;
 952         int ret;
 953
 954         ldb = ldb_module_get_ctx(module);
 955
 956         ldb_debug(ldb, LDB_DEBUG_TRACE, "objectclass_rename\n");
 957
 958         if (ldb_dn_is_special(req->op.rename.newdn)) { /* do not manipulate our control entries */
 959                 return ldb_next_request(module, req);
 960         }
 961
 962         /* Firstly ensure we are not trying to rename it to be a child of itself */
 963         if ((ldb_dn_compare_base(req->op.rename.olddn, req->op.rename.newdn) == 0)
 964             && (ldb_dn_compare(req->op.rename.olddn, req->op.rename.newdn) != 0)) {
 965                 ldb_asprintf_errstring(ldb, "Cannot rename %s to be a child of itself",
 966                                        ldb_dn_get_linearized(req->op.rename.olddn));
 967                 return LDB_ERR_UNWILLING_TO_PERFORM;
 968         }
 969
 970         ac = oc_init_context(module, req);
 971         if (ac == NULL) {
 972                 return LDB_ERR_OPERATIONS_ERROR;
 973         }
 974
 975         parent_dn = ldb_dn_get_parent(ac, req->op.rename.newdn);
 976         if (parent_dn == NULL) {
 977                 ldb_oom(ldb);
 978                 return LDB_ERR_OPERATIONS_ERROR;
 979         }
 980
 981         /* note that the results of this search are kept and used to
 982            update the parentGUID in objectclass_rename_callback() */
 983         ret = ldb_build_search_req(&search_req, ldb,
 984                                    ac, parent_dn, LDB_SCOPE_BASE,
 985                                    "(objectClass=*)",
 986                                    attrs, NULL,
 987                                    ac, get_search_callback,
 988                                    req);
 989         if (ret != LDB_SUCCESS) {
 990                 return ret;
 991         }
 992
 993         /* we have to add the show deleted control, as otherwise DRS
 994            deletes will be refused as we will think the target parent
 995            does not exist */
 996         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, false, NULL);
 997
 998         if (ret != LDB_SUCCESS) {
 999                 return ret;
1000         }
1001
1002         ac->step_fn = objectclass_do_rename;
1003
1004         return ldb_next_request(ac->module, search_req);
1005 }
1006
1007 /*
1008    called after the rename happens.
1009    We now need to fix the parentGUID of the object to be the objectGUID of
1010    the new parent
1011 */
1012 static int objectclass_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
1013 {
1014         struct ldb_context *ldb;
1015         struct oc_context *ac;
1016         const struct ldb_val *parent_guid;
1017         struct ldb_request *mod_req = NULL;
1018         int ret;
1019         struct ldb_message *msg;
1020         struct ldb_message_element *el = NULL;
1021
1022         ac = talloc_get_type(req->context, struct oc_context);
1023         ldb = ldb_module_get_ctx(ac->module);
1024
1025         /* make sure the rename succeeded */
1026         if (!ares) {
1027                 return ldb_module_done(ac->req, NULL, NULL,
1028                                         LDB_ERR_OPERATIONS_ERROR);
1029         }
1030         if (ares->error != LDB_SUCCESS) {
1031                 return ldb_module_done(ac->req, ares->controls,
1032                                         ares->response, ares->error);
1033         }
1034
1035
1036         /* the ac->search_res should contain the new parents objectGUID */
1037         parent_guid = ldb_msg_find_ldb_val(ac->search_res->message, "objectGUID");
1038         if (parent_guid == NULL) {
1039                 ldb_asprintf_errstring(ldb, "objectclass: Cannot rename %s, new parent does not have an objectGUID!",
1040                                        ldb_dn_get_linearized(ac->req->op.rename.newdn));
1041                 return LDB_ERR_UNWILLING_TO_PERFORM;
1042
1043         }
1044
1045         /* construct the modify message */
1046         msg = ldb_msg_new(ac);
1047         if (msg == NULL) {
1048                 ldb_oom(ldb);
1049                 return LDB_ERR_OPERATIONS_ERROR;
1050         }
1051
1052         msg->dn = ac->req->op.rename.newdn;
1053
1054         ret = ldb_msg_add_value(msg, "parentGUID", parent_guid, &el);
1055         if (ret != LDB_SUCCESS) {
1056                 return ret;
1057         }
1058
1059         el->flags = LDB_FLAG_MOD_REPLACE;
1060
1061         ret = ldb_build_mod_req(&mod_req, ldb, ac, msg,
1062                                 NULL, ac, oc_op_callback, req);
1063
1064         return ldb_next_request(ac->module, mod_req);
1065 }
1066
1067 static int objectclass_do_rename(struct oc_context *ac)
1068 {
1069         struct ldb_context *ldb;
1070         struct ldb_request *rename_req;
1071         struct ldb_dn *fixed_dn;
1072         int ret;
1073
1074         ldb = ldb_module_get_ctx(ac->module);
1075
1076         /* Check we have a valid parent */
1077         if (ac->search_res == NULL) {
1078                 ldb_asprintf_errstring(ldb, "objectclass: Cannot rename %s, parent does not exist!",
1079                                        ldb_dn_get_linearized(ac->req->op.rename.newdn));
1080                 return LDB_ERR_UNWILLING_TO_PERFORM;
1081         }
1082
1083         /* Fix up the DN to be in the standard form,
1084          * taking particular care to match the parent DN */
1085         ret = fix_dn(ac,
1086                      ac->req->op.rename.newdn,
1087                      ac->search_res->message->dn,
1088                      &fixed_dn);
1089         if (ret != LDB_SUCCESS) {
1090                 return ret;
1091         }
1092
1093         /* TODO: Check this is a valid child to this parent,
1094          * by reading the allowedChildClasses and
1095          * allowedChildClasssesEffective attributes */
1096
1097         ret = ldb_build_rename_req(&rename_req, ldb, ac,
1098                                    ac->req->op.rename.olddn, fixed_dn,
1099                                    ac->req->controls,
1100                                    ac, objectclass_rename_callback,
1101                                    ac->req);
1102         if (ret != LDB_SUCCESS) {
1103                 return ret;
1104         }
1105
1106         /* perform the rename */
1107         return ldb_next_request(ac->module, rename_req);
1108 }
1109
1110 _PUBLIC_ const struct ldb_module_ops ldb_objectclass_module_ops = {
1111         .name              = "objectclass",
1112         .add           = objectclass_add,
1113         .modify        = objectclass_modify,
1114         .rename        = objectclass_rename,
1115 };