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         switch (ares->type) {
 254         case LDB_REPLY_ENTRY:
 255                 if (ac->search_res != NULL) {
 256                         ldb_set_errstring(ldb, "Too many results");
 257                         talloc_free(ares);
 258                         return ldb_module_done(ac->req, NULL, NULL,
 259                                                 LDB_ERR_OPERATIONS_ERROR);
 260                 }
 261
 262                 ac->search_res = talloc_steal(ac, ares);
 263                 break;
 264
 265         case LDB_REPLY_REFERRAL:
 266                 /* ignore */
 267                 talloc_free(ares);
 268                 break;
 269
 270         case LDB_REPLY_DONE:
 271                 talloc_free(ares);
 272                 ret = ac->step_fn(ac);
 273                 if (ret != LDB_SUCCESS) {
 274                         return ldb_module_done(ac->req, NULL, NULL, ret);
 275                 }
 276                 break;
 277         }
 278
 279         return LDB_SUCCESS;
 280 }
 281
 282 static int oc_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 283 {
 284         struct oc_context *ac;
 285
 286         ac = talloc_get_type(req->context, struct oc_context);
 287
 288         if (!ares) {
 289                 return ldb_module_done(ac->req, NULL, NULL,
 290                                         LDB_ERR_OPERATIONS_ERROR);
 291         }
 292         if (ares->error != LDB_SUCCESS) {
 293                 return ldb_module_done(ac->req, ares->controls,
 294                                         ares->response, ares->error);
 295         }
 296
 297         if (ares->type != LDB_REPLY_DONE) {
 298                 talloc_free(ares);
 299                 return ldb_module_done(ac->req, NULL, NULL,
 300                                         LDB_ERR_OPERATIONS_ERROR);
 301         }
 302
 303         return ldb_module_done(ac->req, ares->controls,
 304                                 ares->response, ares->error);
 305 }
 306
 307 /* Fix up the DN to be in the standard form, taking particular care to match the parent DN
 308
 309    This should mean that if the parent is:
 310     CN=Users,DC=samba,DC=example,DC=com
 311    and a proposed child is
 312     cn=Admins ,cn=USERS,dc=Samba,dc=example,dc=COM
 313
 314    The resulting DN should be:
 315
 316     CN=Admins,CN=Users,DC=samba,DC=example,DC=com
 317
 318  */
 319 static int fix_dn(TALLOC_CTX *mem_ctx,
 320                   struct ldb_dn *newdn, struct ldb_dn *parent_dn,
 321                   struct ldb_dn **fixed_dn)
 322 {
 323         char *upper_rdn_attr;
 324         /* Fix up the DN to be in the standard form, taking particular care to match the parent DN */
 325         *fixed_dn = ldb_dn_copy(mem_ctx, parent_dn);
 326
 327         /* We need the attribute name in upper case */
 328         upper_rdn_attr = strupper_talloc(*fixed_dn,
 329                                          ldb_dn_get_rdn_name(newdn));
 330         if (!upper_rdn_attr) {
 331                 return LDB_ERR_OPERATIONS_ERROR;
 332         }
 333
 334         /* Create a new child */
 335         if (ldb_dn_add_child_fmt(*fixed_dn, "X=X") == false) {
 336                 return LDB_ERR_OPERATIONS_ERROR;
 337         }
 338
 339         /* And replace it with CN=foo (we need the attribute in upper case */
 340         return ldb_dn_set_component(*fixed_dn, 0, upper_rdn_attr,
 341                                     *ldb_dn_get_rdn_val(newdn));
 342 }
 343
 344 /* Fix all attribute names to be in the correct case, and check they are all valid per the schema */
 345 static int fix_attributes(struct ldb_context *ldb, const struct dsdb_schema *schema, struct ldb_message *msg)
 346 {
 347         int i;
 348         for (i=0; i < msg->num_elements; i++) {
 349                 const struct dsdb_attribute *attribute = dsdb_attribute_by_lDAPDisplayName(schema, msg->elements[i].name);
 350                 /* Add in a very special case for 'clearTextPassword',
 351                  * which is used for internal processing only, and is
 352                  * not presented in the schema */
 353                 if (!attribute) {
 354                         if (strcasecmp(msg->elements[i].name, "clearTextPassword") != 0) {
 355                                 ldb_asprintf_errstring(ldb, "attribute %s is not a valid attribute in schema", msg->elements[i].name);
 356                                 return LDB_ERR_UNDEFINED_ATTRIBUTE_TYPE;
 357                         }
 358                 } else {
 359                         msg->elements[i].name = attribute->lDAPDisplayName;
 360                 }
 361         }
 362
 363         return LDB_SUCCESS;
 364 }
 365
 366 static int objectclass_do_add(struct oc_context *ac);
 367
 368 static int objectclass_add(struct ldb_module *module, struct ldb_request *req)
 369 {
 370         struct ldb_context *ldb;
 371         struct ldb_request *search_req;
 372         struct oc_context *ac;
 373         struct ldb_dn *parent_dn;
 374         int ret;
 375         static const char * const parent_attrs[] = { "objectGUID", NULL };
 376
 377         ldb = ldb_module_get_ctx(module);
 378
 379         ldb_debug(ldb, LDB_DEBUG_TRACE, "objectclass_add\n");
 380
 381         /* do not manipulate our control entries */
 382         if (ldb_dn_is_special(req->op.add.message->dn)) {
 383                 return ldb_next_request(module, req);
 384         }
 385
 386         /* the objectClass must be specified on add */
 387         if (ldb_msg_find_element(req->op.add.message,
 388                                  "objectClass") == NULL) {
 389                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
 390         }
 391
 392         ac = oc_init_context(module, req);
 393         if (ac == NULL) {
 394                 return LDB_ERR_OPERATIONS_ERROR;
 395         }
 396
 397         /* If there isn't a parent, just go on to the add processing */
 398         if (ldb_dn_get_comp_num(ac->req->op.add.message->dn) == 1) {
 399                 return objectclass_do_add(ac);
 400         }
 401
 402         /* get copy of parent DN */
 403         parent_dn = ldb_dn_get_parent(ac, ac->req->op.add.message->dn);
 404         if (parent_dn == NULL) {
 405                 ldb_oom(ldb);
 406                 return LDB_ERR_OPERATIONS_ERROR;
 407         }
 408
 409         ret = ldb_build_search_req(&search_req, ldb,
 410                                    ac, parent_dn, LDB_SCOPE_BASE,
 411                                    "(objectClass=*)", parent_attrs,
 412                                    NULL,
 413                                    ac, get_search_callback,
 414                                    req);
 415         if (ret != LDB_SUCCESS) {
 416                 return ret;
 417         }
 418         talloc_steal(search_req, parent_dn);
 419
 420         ac->step_fn = objectclass_do_add;
 421
 422         return ldb_next_request(ac->module, search_req);
 423 }
 424
 425 static int objectclass_do_add(struct oc_context *ac)
 426 {
 427         struct ldb_context *ldb;
 428         const struct dsdb_schema *schema;
 429         struct ldb_request *add_req;
 430         char *value;
 431         struct ldb_message_element *objectclass_element;
 432         struct ldb_message *msg;
 433         TALLOC_CTX *mem_ctx;
 434         struct class_list *sorted, *current;
 435         int ret;
 436
 437         ldb = ldb_module_get_ctx(ac->module);
 438         schema = dsdb_get_schema(ldb);
 439
 440         mem_ctx = talloc_new(ac);
 441         if (mem_ctx == NULL) {
 442                 return LDB_ERR_OPERATIONS_ERROR;
 443         }
 444
 445         msg = ldb_msg_copy_shallow(ac, ac->req->op.add.message);
 446
 447         /* Check we have a valid parent */
 448         if (ac->search_res == NULL) {
 449                 if (ldb_dn_compare(ldb_get_root_basedn(ldb),
 450                                                                 msg->dn) == 0) {
 451                         /* Allow the tree to be started */
 452
 453                         /* but don't keep any error string, it's meaningless */
 454                         ldb_set_errstring(ldb, NULL);
 455                 } else {
 456                         ldb_asprintf_errstring(ldb, "objectclass: Cannot add %s, parent does not exist!",
 457                                                ldb_dn_get_linearized(msg->dn));
 458                         talloc_free(mem_ctx);
 459                         return LDB_ERR_UNWILLING_TO_PERFORM;
 460                 }
 461         } else {
 462                 const struct ldb_val *parent_guid;
 463
 464                 /* Fix up the DN to be in the standard form, taking particular care to match the parent DN */
 465                 ret = fix_dn(msg,
 466                              ac->req->op.add.message->dn,
 467                              ac->search_res->message->dn,
 468                              &msg->dn);
 469
 470                 if (ret != LDB_SUCCESS) {
 471                         ldb_asprintf_errstring(ldb, "Could not munge DN %s into normal form",
 472                                                ldb_dn_get_linearized(ac->req->op.add.message->dn));
 473                         talloc_free(mem_ctx);
 474                         return ret;
 475                 }
 476
 477                 parent_guid = ldb_msg_find_ldb_val(ac->search_res->message, "objectGUID");
 478                 if (parent_guid == NULL) {
 479                         ldb_asprintf_errstring(ldb, "objectclass: Cannot add %s, parent does not have an objectGUID!",
 480                                                ldb_dn_get_linearized(msg->dn));
 481                         talloc_free(mem_ctx);
 482                         return LDB_ERR_UNWILLING_TO_PERFORM;
 483                 }
 484
 485                 /* TODO: Check this is a valid child to this parent,
 486                  * by reading the allowedChildClasses and
 487                  * allowedChildClasssesEffective attributes */
 488                 ret = ldb_msg_add_steal_value(msg, "parentGUID", discard_const(parent_guid));
 489                 if (ret != LDB_SUCCESS) {
 490                         ldb_asprintf_errstring(ldb, "objectclass: Cannot add %s, failed to add parentGUID",
 491                                                ldb_dn_get_linearized(msg->dn));
 492                         talloc_free(mem_ctx);
 493                         return LDB_ERR_UNWILLING_TO_PERFORM;
 494                 }
 495         }
 496         if (schema) {
 497                 ret = fix_attributes(ldb, schema, msg);
 498                 if (ret != LDB_SUCCESS) {
 499                         talloc_free(mem_ctx);
 500                         return ret;
 501                 }
 502
 503                 /* This is now the objectClass list from the database */
 504                 objectclass_element = ldb_msg_find_element(msg, "objectClass");
 505
 506                 if (!objectclass_element) {
 507                         /* Where did it go?  bail now... */
 508                         talloc_free(mem_ctx);
 509                         return LDB_ERR_OPERATIONS_ERROR;
 510                 }
 511                 ret = objectclass_sort(ac->module, schema, mem_ctx, objectclass_element, &sorted);
 512                 if (ret != LDB_SUCCESS) {
 513                         talloc_free(mem_ctx);
 514                         return ret;
 515                 }
 516
 517                 ldb_msg_remove_attr(msg, "objectClass");
 518                 ret = ldb_msg_add_empty(msg, "objectClass", 0, NULL);
 519
 520                 if (ret != LDB_SUCCESS) {
 521                         talloc_free(mem_ctx);
 522                         return ret;
 523                 }
 524
 525                 /* We must completely replace the existing objectClass entry,
 526                  * because we need it sorted */
 527
 528                 /* Move from the linked list back into an ldb msg */
 529                 for (current = sorted; current; current = current->next) {
 530                         value = talloc_strdup(msg, current->objectclass->lDAPDisplayName);
 531                         if (value == NULL) {
 532                                 ldb_oom(ldb);
 533                                 talloc_free(mem_ctx);
 534                                 return LDB_ERR_OPERATIONS_ERROR;
 535                         }
 536                         ret = ldb_msg_add_string(msg, "objectClass", value);
 537                         if (ret != LDB_SUCCESS) {
 538                                 ldb_set_errstring(ldb,
 539                                                   "objectclass: could not re-add sorted "
 540                                                   "objectclass to modify msg");
 541                                 talloc_free(mem_ctx);
 542                                 return ret;
 543                         }
 544                         /* Last one is the critical one */
 545                         if (!current->next) {
 546                                 struct ldb_message_element *el;
 547                                 int32_t systemFlags = 0;
 548                                 DATA_BLOB *sd;
 549                                 if (!ldb_msg_find_element(msg, "objectCategory")) {
 550                                         value = talloc_strdup(msg, current->objectclass->defaultObjectCategory);
 551                                         if (value == NULL) {
 552                                                 ldb_oom(ldb);
 553                                                 talloc_free(mem_ctx);
 554                                                 return LDB_ERR_OPERATIONS_ERROR;
 555                                         }
 556                                         ldb_msg_add_string(msg, "objectCategory", value);
 557                                 }
 558                                 if (!ldb_msg_find_element(msg, "showInAdvancedViewOnly") && (current->objectclass->defaultHidingValue == true)) {
 559                                         ldb_msg_add_string(msg, "showInAdvancedViewOnly",
 560                                                            "TRUE");
 561                                 }
 562
 563                                 /* There are very special rules for systemFlags, see MS-ADTS 3.1.1.5.2.4 */
 564                                 el = ldb_msg_find_element(msg, "systemFlags");
 565
 566                                 systemFlags = ldb_msg_find_attr_as_int(msg, "systemFlags", 0);
 567
 568                                 if (el) {
 569                                         /* Only these flags may be set by a client, but we can't tell between a client and our provision at this point */
 570                                         /* systemFlags &= ( SYSTEM_FLAG_CONFIG_ALLOW_RENAME | SYSTEM_FLAG_CONFIG_ALLOW_MOVE | SYSTEM_FLAG_CONFIG_LIMITED_MOVE); */
 571                                         ldb_msg_remove_element(msg, el);
 572                                 }
 573
 574                                 /* This flag is only allowed on attributeSchema objects */
 575                                 if (ldb_attr_cmp(current->objectclass->lDAPDisplayName, "attributeSchema") == 0) {
 576                                         systemFlags &= ~SYSTEM_FLAG_ATTR_IS_RDN;
 577                                 }
 578
 579                                 if (ldb_attr_cmp(current->objectclass->lDAPDisplayName, "server") == 0) {
 580                                         systemFlags |= (int32_t)(SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE | SYSTEM_FLAG_CONFIG_ALLOW_RENAME | SYSTEM_FLAG_CONFIG_ALLOW_LIMITED_MOVE);
 581                                 } else if (ldb_attr_cmp(current->objectclass->lDAPDisplayName, "site") == 0
 582                                            || ldb_attr_cmp(current->objectclass->lDAPDisplayName, "serverContainer") == 0
 583                                            || ldb_attr_cmp(current->objectclass->lDAPDisplayName, "ntDSDSA") == 0) {
 584                                         systemFlags |= (int32_t)(SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE);
 585
 586                                 } else if (ldb_attr_cmp(current->objectclass->lDAPDisplayName, "siteLink") == 0
 587                                            || ldb_attr_cmp(current->objectclass->lDAPDisplayName, "siteLinkBridge") == 0
 588                                            || ldb_attr_cmp(current->objectclass->lDAPDisplayName, "nTDSConnection") == 0) {
 589                                         systemFlags |= (int32_t)(SYSTEM_FLAG_CONFIG_ALLOW_RENAME);
 590                                 }
 591
 592                                 /* TODO: If parent object is site or subnet, also add (SYSTEM_FLAG_CONFIG_ALLOW_RENAME) */
 593
 594                                 if (el || systemFlags != 0) {
 595                                         samdb_msg_add_int(ldb, msg, msg, "systemFlags", systemFlags);
 596                                 }
 597                         }
 598                 }
 599         }
 600
 601         talloc_free(mem_ctx);
 602         ret = ldb_msg_sanity_check(ldb, msg);
 603
 604
 605         if (ret != LDB_SUCCESS) {
 606                 return ret;
 607         }
 608
 609         ret = ldb_build_add_req(&add_req, ldb, ac,
 610                                 msg,
 611                                 ac->req->controls,
 612                                 ac, oc_op_callback,
 613                                 ac->req);
 614         if (ret != LDB_SUCCESS) {
 615                 return ret;
 616         }
 617
 618         /* perform the add */
 619         return ldb_next_request(ac->module, add_req);
 620 }
 621
 622 static int oc_modify_callback(struct ldb_request *req,
 623                                 struct ldb_reply *ares);
 624 static int objectclass_do_mod(struct oc_context *ac);
 625
 626 static int objectclass_modify(struct ldb_module *module, struct ldb_request *req)
 627 {
 628         struct ldb_context *ldb = ldb_module_get_ctx(module);
 629         struct ldb_message_element *objectclass_element;
 630         struct ldb_message *msg;
 631         const struct dsdb_schema *schema = dsdb_get_schema(ldb);
 632         struct class_list *sorted, *current;
 633         struct ldb_request *down_req;
 634         struct oc_context *ac;
 635         TALLOC_CTX *mem_ctx;
 636         char *value;
 637         int ret;
 638
 639         ldb_debug(ldb, LDB_DEBUG_TRACE, "objectclass_modify\n");
 640
 641         /* do not manipulate our control entries */
 642         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 643                 return ldb_next_request(module, req);
 644         }
 645
 646         /* Without schema, there isn't much to do here */
 647         if (!schema) {
 648                 return ldb_next_request(module, req);
 649         }
 650         objectclass_element = ldb_msg_find_element(req->op.mod.message, "objectClass");
 651
 652         ac = oc_init_context(module, req);
 653         if (ac == NULL) {
 654                 return LDB_ERR_OPERATIONS_ERROR;
 655         }
 656
 657         /* If no part of this touches the objectClass, then we don't
 658          * need to make any changes.  */
 659
 660         /* If the only operation is the deletion of the objectClass
 661          * then go on with just fixing the attribute case */
 662         if (!objectclass_element) {
 663                 msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
 664                 if (msg == NULL) {
 665                         return LDB_ERR_OPERATIONS_ERROR;
 666                 }
 667
 668                 ret = fix_attributes(ldb, schema, msg);
 669                 if (ret != LDB_SUCCESS) {
 670                         return ret;
 671                 }
 672
 673                 ret = ldb_build_mod_req(&down_req, ldb, ac,
 674                                         msg,
 675                                         req->controls,
 676                                         ac, oc_op_callback,
 677                                         req);
 678                 if (ret != LDB_SUCCESS) {
 679                         return ret;
 680                 }
 681
 682                 /* go on with the call chain */
 683                 return ldb_next_request(module, down_req);
 684         }
 685
 686         switch (objectclass_element->flags & LDB_FLAG_MOD_MASK) {
 687         case LDB_FLAG_MOD_DELETE:
 688                 if (objectclass_element->num_values == 0) {
 689                         return LDB_ERR_OBJECT_CLASS_MODS_PROHIBITED;
 690                 }
 691                 break;
 692
 693         case LDB_FLAG_MOD_REPLACE:
 694                 mem_ctx = talloc_new(ac);
 695                 if (mem_ctx == NULL) {
 696                         return LDB_ERR_OPERATIONS_ERROR;
 697                 }
 698
 699                 msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
 700                 if (msg == NULL) {
 701                         talloc_free(mem_ctx);
 702                         return LDB_ERR_OPERATIONS_ERROR;
 703                 }
 704
 705                 ret = fix_attributes(ldb, schema, msg);
 706                 if (ret != LDB_SUCCESS) {
 707                         talloc_free(mem_ctx);
 708                         return ret;
 709                 }
 710
 711                 ret = objectclass_sort(module, schema, mem_ctx, objectclass_element, &sorted);
 712                 if (ret != LDB_SUCCESS) {
 713                         talloc_free(mem_ctx);
 714                         return ret;
 715                 }
 716
 717                 /* We must completely replace the existing objectClass entry,
 718                  * because we need it sorted */
 719
 720                 ldb_msg_remove_attr(msg, "objectClass");
 721                 ret = ldb_msg_add_empty(msg, "objectClass", LDB_FLAG_MOD_REPLACE, NULL);
 722
 723                 if (ret != LDB_SUCCESS) {
 724                         talloc_free(mem_ctx);
 725                         return ret;
 726                 }
 727
 728                 /* Move from the linked list back into an ldb msg */
 729                 for (current = sorted; current; current = current->next) {
 730                         /* copy the value as this string is on the schema
 731                          * context and we can't rely on it not changing
 732                          * before the operation is over */
 733                         value = talloc_strdup(msg,
 734                                         current->objectclass->lDAPDisplayName);
 735                         if (value == NULL) {
 736                                 ldb_oom(ldb);
 737                                 talloc_free(mem_ctx);
 738                                 return LDB_ERR_OPERATIONS_ERROR;
 739                         }
 740                         ret = ldb_msg_add_string(msg, "objectClass", value);
 741                         if (ret != LDB_SUCCESS) {
 742                                 ldb_set_errstring(ldb,
 743                                         "objectclass: could not re-add sorted "
 744                                         "objectclass to modify msg");
 745                                 talloc_free(mem_ctx);
 746                                 return ret;
 747                         }
 748                 }
 749
 750                 talloc_free(mem_ctx);
 751
 752                 ret = ldb_msg_sanity_check(ldb, msg);
 753                 if (ret != LDB_SUCCESS) {
 754                         return ret;
 755                 }
 756
 757                 ret = ldb_build_mod_req(&down_req, ldb, ac,
 758                                         msg,
 759                                         req->controls,
 760                                         ac, oc_op_callback,
 761                                         req);
 762                 if (ret != LDB_SUCCESS) {
 763                         return ret;
 764                 }
 765
 766                 /* go on with the call chain */
 767                 return ldb_next_request(module, down_req);
 768         }
 769
 770         /* This isn't the default branch of the switch, but a 'in any
 771          * other case'.  When a delete isn't for all objectClasses for
 772          * example
 773          */
 774
 775         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
 776         if (msg == NULL) {
 777                 ldb_oom(ldb);
 778                 return LDB_ERR_OPERATIONS_ERROR;
 779         }
 780
 781         ret = fix_attributes(ldb, schema, msg);
 782         if (ret != LDB_SUCCESS) {
 783                 ldb_oom(ldb);
 784                 return ret;
 785         }
 786
 787         ret = ldb_build_mod_req(&down_req, ldb, ac,
 788                                 msg,
 789                                 req->controls,
 790                                 ac, oc_modify_callback,
 791                                 req);
 792         if (ret != LDB_SUCCESS) {
 793                 return ret;
 794         }
 795
 796         return ldb_next_request(module, down_req);
 797 }
 798
 799 static int oc_modify_callback(struct ldb_request *req, struct ldb_reply *ares)
 800 {
 801         struct ldb_context *ldb;
 802         static const char * const attrs[] = { "objectClass", NULL };
 803         struct ldb_request *search_req;
 804         struct oc_context *ac;
 805         int ret;
 806
 807         ac = talloc_get_type(req->context, struct oc_context);
 808         ldb = ldb_module_get_ctx(ac->module);
 809
 810         if (!ares) {
 811                 return ldb_module_done(ac->req, NULL, NULL,
 812                                         LDB_ERR_OPERATIONS_ERROR);
 813         }
 814         if (ares->error != LDB_SUCCESS) {
 815                 return ldb_module_done(ac->req, ares->controls,
 816                                         ares->response, ares->error);
 817         }
 818
 819         if (ares->type != LDB_REPLY_DONE) {
 820                 talloc_free(ares);
 821                 return ldb_module_done(ac->req, NULL, NULL,
 822                                         LDB_ERR_OPERATIONS_ERROR);
 823         }
 824
 825         ret = ldb_build_search_req(&search_req, ldb, ac,
 826                                    ac->req->op.mod.message->dn, LDB_SCOPE_BASE,
 827                                    "(objectClass=*)",
 828                                    attrs, NULL,
 829                                    ac, get_search_callback,
 830                                    ac->req);
 831         if (ret != LDB_SUCCESS) {
 832                 return ldb_module_done(ac->req, NULL, NULL, ret);
 833         }
 834
 835         ac->step_fn = objectclass_do_mod;
 836
 837         ret = ldb_next_request(ac->module, search_req);
 838         if (ret != LDB_SUCCESS) {
 839                 return ldb_module_done(ac->req, NULL, NULL, ret);
 840         }
 841         return LDB_SUCCESS;
 842 }
 843
 844 static int objectclass_do_mod(struct oc_context *ac)
 845 {
 846         struct ldb_context *ldb;
 847         const struct dsdb_schema *schema;
 848         struct ldb_request *mod_req;
 849         char *value;
 850         struct ldb_message_element *objectclass_element;
 851         struct ldb_message *msg;
 852         TALLOC_CTX *mem_ctx;
 853         struct class_list *sorted, *current;
 854         int ret;
 855
 856         ldb = ldb_module_get_ctx(ac->module);
 857
 858         if (ac->search_res == NULL) {
 859                 return LDB_ERR_OPERATIONS_ERROR;
 860         }
 861         schema = dsdb_get_schema(ldb);
 862
 863         mem_ctx = talloc_new(ac);
 864         if (mem_ctx == NULL) {
 865                 return LDB_ERR_OPERATIONS_ERROR;
 866         }
 867
 868         /* use a new message structure */
 869         msg = ldb_msg_new(ac);
 870         if (msg == NULL) {
 871                 ldb_set_errstring(ldb,
 872                         "objectclass: could not create new modify msg");
 873                 talloc_free(mem_ctx);
 874                 return LDB_ERR_OPERATIONS_ERROR;
 875         }
 876
 877         /* This is now the objectClass list from the database */
 878         objectclass_element = ldb_msg_find_element(ac->search_res->message,
 879                                                    "objectClass");
 880         if (!objectclass_element) {
 881                 /* Where did it go?  bail now... */
 882                 talloc_free(mem_ctx);
 883                 return LDB_ERR_OPERATIONS_ERROR;
 884         }
 885
 886         /* modify dn */
 887         msg->dn = ac->req->op.mod.message->dn;
 888
 889         ret = objectclass_sort(ac->module, schema, mem_ctx, objectclass_element, &sorted);
 890         if (ret != LDB_SUCCESS) {
 891                 return ret;
 892         }
 893
 894         /* We must completely replace the existing objectClass entry.
 895          * We could do a constrained add/del, but we are meant to be
 896          * in a transaction... */
 897
 898         ret = ldb_msg_add_empty(msg, "objectClass", LDB_FLAG_MOD_REPLACE, NULL);
 899         if (ret != LDB_SUCCESS) {
 900                 ldb_set_errstring(ldb, "objectclass: could not clear objectclass in modify msg");
 901                 talloc_free(mem_ctx);
 902                 return ret;
 903         }
 904
 905         /* Move from the linked list back into an ldb msg */
 906         for (current = sorted; current; current = current->next) {
 907                 value = talloc_strdup(msg, current->objectclass->lDAPDisplayName);
 908                 if (value == NULL) {
 909                         ldb_oom(ldb);
 910                         return LDB_ERR_OPERATIONS_ERROR;
 911                 }
 912                 ret = ldb_msg_add_string(msg, "objectClass", value);
 913                 if (ret != LDB_SUCCESS) {
 914                         ldb_set_errstring(ldb, "objectclass: could not re-add sorted objectclass to modify msg");
 915                         talloc_free(mem_ctx);
 916                         return ret;
 917                 }
 918         }
 919
 920         ret = ldb_msg_sanity_check(ldb, msg);
 921         if (ret != LDB_SUCCESS) {
 922                 talloc_free(mem_ctx);
 923                 return ret;
 924         }
 925
 926         ret = ldb_build_mod_req(&mod_req, ldb, ac,
 927                                 msg,
 928                                 ac->req->controls,
 929                                 ac, oc_op_callback,
 930                                 ac->req);
 931         if (ret != LDB_SUCCESS) {
 932                 talloc_free(mem_ctx);
 933                 return ret;
 934         }
 935
 936         talloc_free(mem_ctx);
 937         /* perform the modify */
 938         return ldb_next_request(ac->module, mod_req);
 939 }
 940
 941 static int objectclass_do_rename(struct oc_context *ac);
 942
 943 static int objectclass_rename(struct ldb_module *module, struct ldb_request *req)
 944 {
 945         static const char * const attrs[] = { "objectGUID", NULL };
 946         struct ldb_context *ldb;
 947         struct ldb_request *search_req;
 948         struct oc_context *ac;
 949         struct ldb_dn *parent_dn;
 950         int ret;
 951
 952         ldb = ldb_module_get_ctx(module);
 953
 954         ldb_debug(ldb, LDB_DEBUG_TRACE, "objectclass_rename\n");
 955
 956         if (ldb_dn_is_special(req->op.rename.newdn)) { /* do not manipulate our control entries */
 957                 return ldb_next_request(module, req);
 958         }
 959
 960         /* Firstly ensure we are not trying to rename it to be a child of itself */
 961         if ((ldb_dn_compare_base(req->op.rename.olddn, req->op.rename.newdn) == 0)
 962             && (ldb_dn_compare(req->op.rename.olddn, req->op.rename.newdn) != 0)) {
 963                 ldb_asprintf_errstring(ldb, "Cannot rename %s to be a child of itself",
 964                                        ldb_dn_get_linearized(req->op.rename.olddn));
 965                 return LDB_ERR_UNWILLING_TO_PERFORM;
 966         }
 967
 968         ac = oc_init_context(module, req);
 969         if (ac == NULL) {
 970                 return LDB_ERR_OPERATIONS_ERROR;
 971         }
 972
 973         parent_dn = ldb_dn_get_parent(ac, req->op.rename.newdn);
 974         if (parent_dn == NULL) {
 975                 ldb_oom(ldb);
 976                 return LDB_ERR_OPERATIONS_ERROR;
 977         }
 978
 979         /* note that the results of this search are kept and used to
 980            update the parentGUID in objectclass_rename_callback() */
 981         ret = ldb_build_search_req(&search_req, ldb,
 982                                    ac, parent_dn, LDB_SCOPE_BASE,
 983                                    "(objectClass=*)",
 984                                    attrs, NULL,
 985                                    ac, get_search_callback,
 986                                    req);
 987         if (ret != LDB_SUCCESS) {
 988                 return ret;
 989         }
 990
 991         /* we have to add the show deleted control, as otherwise DRS
 992            deletes will be refused as we will think the target parent
 993            does not exist */
 994         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, false, NULL);
 995
 996         if (ret != LDB_SUCCESS) {
 997                 return ret;
 998         }
 999
1000         ac->step_fn = objectclass_do_rename;
1001
1002         return ldb_next_request(ac->module, search_req);
1003 }
1004
1005 /*
1006    called after the rename happens.
1007    We now need to fix the parentGUID of the object to be the objectGUID of
1008    the new parent
1009 */
1010 static int objectclass_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
1011 {
1012         struct ldb_context *ldb;
1013         struct oc_context *ac;
1014         const struct ldb_val *parent_guid;
1015         struct ldb_request *mod_req = NULL;
1016         int ret;
1017         struct ldb_message *msg;
1018         struct ldb_message_element *el = NULL;
1019
1020         ac = talloc_get_type(req->context, struct oc_context);
1021         ldb = ldb_module_get_ctx(ac->module);
1022
1023         /* make sure the rename succeeded */
1024         if (!ares) {
1025                 return ldb_module_done(ac->req, NULL, NULL,
1026                                         LDB_ERR_OPERATIONS_ERROR);
1027         }
1028         if (ares->error != LDB_SUCCESS) {
1029                 return ldb_module_done(ac->req, ares->controls,
1030                                         ares->response, ares->error);
1031         }
1032
1033
1034         /* the ac->search_res should contain the new parents objectGUID */
1035         parent_guid = ldb_msg_find_ldb_val(ac->search_res->message, "objectGUID");
1036         if (parent_guid == NULL) {
1037                 ldb_asprintf_errstring(ldb, "objectclass: Cannot rename %s, new parent does not have an objectGUID!",
1038                                        ldb_dn_get_linearized(ac->req->op.rename.newdn));
1039                 return LDB_ERR_UNWILLING_TO_PERFORM;
1040
1041         }
1042
1043         /* construct the modify message */
1044         msg = ldb_msg_new(ac);
1045         if (msg == NULL) {
1046                 ldb_oom(ldb);
1047                 return LDB_ERR_OPERATIONS_ERROR;
1048         }
1049
1050         msg->dn = ac->req->op.rename.newdn;
1051
1052         ret = ldb_msg_add_value(msg, "parentGUID", parent_guid, &el);
1053         if (ret != LDB_SUCCESS) {
1054                 return ret;
1055         }
1056
1057         el->flags = LDB_FLAG_MOD_REPLACE;
1058
1059         ret = ldb_build_mod_req(&mod_req, ldb, ac, msg,
1060                                 NULL, ac, oc_op_callback, req);
1061
1062         return ldb_next_request(ac->module, mod_req);
1063 }
1064
1065 static int objectclass_do_rename(struct oc_context *ac)
1066 {
1067         struct ldb_context *ldb;
1068         struct ldb_request *rename_req;
1069         struct ldb_dn *fixed_dn;
1070         int ret;
1071
1072         ldb = ldb_module_get_ctx(ac->module);
1073
1074         /* Check we have a valid parent */
1075         if (ac->search_res == NULL) {
1076                 ldb_asprintf_errstring(ldb, "objectclass: Cannot rename %s, parent does not exist!",
1077                                        ldb_dn_get_linearized(ac->req->op.rename.newdn));
1078                 return LDB_ERR_UNWILLING_TO_PERFORM;
1079         }
1080
1081         /* Fix up the DN to be in the standard form,
1082          * taking particular care to match the parent DN */
1083         ret = fix_dn(ac,
1084                      ac->req->op.rename.newdn,
1085                      ac->search_res->message->dn,
1086                      &fixed_dn);
1087         if (ret != LDB_SUCCESS) {
1088                 return ret;
1089         }
1090
1091         /* TODO: Check this is a valid child to this parent,
1092          * by reading the allowedChildClasses and
1093          * allowedChildClasssesEffective attributes */
1094
1095         ret = ldb_build_rename_req(&rename_req, ldb, ac,
1096                                    ac->req->op.rename.olddn, fixed_dn,
1097                                    ac->req->controls,
1098                                    ac, objectclass_rename_callback,
1099                                    ac->req);
1100         if (ret != LDB_SUCCESS) {
1101                 return ret;
1102         }
1103
1104         /* perform the rename */
1105         return ldb_next_request(ac->module, rename_req);
1106 }
1107
1108 _PUBLIC_ const struct ldb_module_ops ldb_objectclass_module_ops = {
1109         .name              = "objectclass",
1110         .add           = objectclass_add,
1111         .modify        = objectclass_modify,
1112         .rename        = objectclass_rename,
1113 };