source4/dsdb/samdb/ldb_modules/repl_meta_data.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2004-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2013
   6    Copyright (C) Andrew Tridgell 2005-2009
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   8    Copyright (C) Matthieu Patou <mat@samba.org> 2010-2011
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 /*
  25  *  Name: ldb
  26  *
  27  *  Component: ldb repl_meta_data module
  28  *
  29  *  Description: - add a unique objectGUID onto every new record,
  30  *               - handle whenCreated, whenChanged timestamps
  31  *               - handle uSNCreated, uSNChanged numbers
  32  *               - handle replPropertyMetaData attribute
  33  *
  34  *  Author: Simo Sorce
  35  *  Author: Stefan Metzmacher
  36  */
  37
  38 #include "includes.h"
  39 #include "ldb_module.h"
  40 #include "dsdb/samdb/samdb.h"
  41 #include "dsdb/common/proto.h"
  42 #include "../libds/common/flags.h"
  43 #include "librpc/gen_ndr/ndr_misc.h"
  44 #include "librpc/gen_ndr/ndr_drsuapi.h"
  45 #include "librpc/gen_ndr/ndr_drsblobs.h"
  46 #include "param/param.h"
  47 #include "libcli/security/security.h"
  48 #include "lib/util/dlinklist.h"
  49 #include "dsdb/samdb/ldb_modules/util.h"
  50 #include "lib/util/binsearch.h"
  51 #include "lib/util/tsort.h"
  52
  53 /*
  54  * It's 29/12/9999 at 23:59:59 UTC as specified in MS-ADTS 7.1.1.4.2
  55  * Deleted Objects Container
  56  */
  57 static const NTTIME DELETED_OBJECT_CONTAINER_CHANGE_TIME = 2650466015990000000ULL;
  58
  59 struct replmd_private {
  60         TALLOC_CTX *la_ctx;
  61         struct la_entry *la_list;
  62         TALLOC_CTX *bl_ctx;
  63         struct la_backlink *la_backlinks;
  64         struct nc_entry {
  65                 struct nc_entry *prev, *next;
  66                 struct ldb_dn *dn;
  67                 uint64_t mod_usn;
  68                 uint64_t mod_usn_urgent;
  69         } *ncs;
  70 };
  71
  72 struct la_entry {
  73         struct la_entry *next, *prev;
  74         struct drsuapi_DsReplicaLinkedAttribute *la;
  75 };
  76
  77 struct replmd_replicated_request {
  78         struct ldb_module *module;
  79         struct ldb_request *req;
  80
  81         const struct dsdb_schema *schema;
  82
  83         /* the controls we pass down */
  84         struct ldb_control **controls;
  85
  86         /* details for the mode where we apply a bunch of inbound replication meessages */
  87         bool apply_mode;
  88         uint32_t index_current;
  89         struct dsdb_extended_replicated_objects *objs;
  90
  91         struct ldb_message *search_msg;
  92
  93         uint64_t seq_num;
  94         bool is_urgent;
  95
  96         bool isDeleted;
  97 };
  98
  99 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar);
 100 static int replmd_delete_internals(struct ldb_module *module, struct ldb_request *req, bool re_delete);
 101
 102 enum urgent_situation {
 103         REPL_URGENT_ON_CREATE = 1,
 104         REPL_URGENT_ON_UPDATE = 2,
 105         REPL_URGENT_ON_DELETE = 4
 106 };
 107
 108 enum deletion_state {
 109         OBJECT_NOT_DELETED=1,
 110         OBJECT_DELETED=2,
 111         OBJECT_RECYCLED=3,
 112         OBJECT_TOMBSTONE=4,
 113         OBJECT_REMOVED=5
 114 };
 115
 116 static void replmd_deletion_state(struct ldb_module *module,
 117                                   const struct ldb_message *msg,
 118                                   enum deletion_state *current_state,
 119                                   enum deletion_state *next_state)
 120 {
 121         int ret;
 122         bool enabled = false;
 123
 124         if (msg == NULL) {
 125                 *current_state = OBJECT_REMOVED;
 126                 if (next_state != NULL) {
 127                         *next_state = OBJECT_REMOVED;
 128                 }
 129                 return;
 130         }
 131
 132         ret = dsdb_recyclebin_enabled(module, &enabled);
 133         if (ret != LDB_SUCCESS) {
 134                 enabled = false;
 135         }
 136
 137         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
 138                 if (!enabled) {
 139                         *current_state = OBJECT_TOMBSTONE;
 140                         if (next_state != NULL) {
 141                                 *next_state = OBJECT_REMOVED;
 142                         }
 143                         return;
 144                 }
 145
 146                 if (ldb_msg_check_string_attribute(msg, "isRecycled", "TRUE")) {
 147                         *current_state = OBJECT_RECYCLED;
 148                         if (next_state != NULL) {
 149                                 *next_state = OBJECT_REMOVED;
 150                         }
 151                         return;
 152                 }
 153
 154                 *current_state = OBJECT_DELETED;
 155                 if (next_state != NULL) {
 156                         *next_state = OBJECT_RECYCLED;
 157                 }
 158                 return;
 159         }
 160
 161         *current_state = OBJECT_NOT_DELETED;
 162         if (next_state == NULL) {
 163                 return;
 164         }
 165
 166         if (enabled) {
 167                 *next_state = OBJECT_DELETED;
 168         } else {
 169                 *next_state = OBJECT_TOMBSTONE;
 170         }
 171 }
 172
 173 static const struct {
 174         const char *update_name;
 175         enum urgent_situation repl_situation;
 176 } urgent_objects[] = {
 177                 {"nTDSDSA", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 178                 {"crossRef", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 179                 {"attributeSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 180                 {"classSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 181                 {"secret", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 182                 {"rIDManager", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 183                 {NULL, 0}
 184 };
 185
 186 /* Attributes looked for when updating or deleting, to check for a urgent replication needed */
 187 static const char *urgent_attrs[] = {
 188                 "lockoutTime",
 189                 "pwdLastSet",
 190                 "userAccountControl",
 191                 NULL
 192 };
 193
 194
 195 static bool replmd_check_urgent_objectclass(const struct ldb_message_element *objectclass_el,
 196                                         enum urgent_situation situation)
 197 {
 198         unsigned int i, j;
 199         for (i=0; urgent_objects[i].update_name; i++) {
 200
 201                 if ((situation & urgent_objects[i].repl_situation) == 0) {
 202                         continue;
 203                 }
 204
 205                 for (j=0; j<objectclass_el->num_values; j++) {
 206                         const struct ldb_val *v = &objectclass_el->values[j];
 207                         if (ldb_attr_cmp((const char *)v->data, urgent_objects[i].update_name) == 0) {
 208                                 return true;
 209                         }
 210                 }
 211         }
 212         return false;
 213 }
 214
 215 static bool replmd_check_urgent_attribute(const struct ldb_message_element *el)
 216 {
 217         if (ldb_attr_in_list(urgent_attrs, el->name)) {
 218                 return true;
 219         }
 220         return false;
 221 }
 222
 223
 224 static int replmd_replicated_apply_isDeleted(struct replmd_replicated_request *ar);
 225
 226 /*
 227   initialise the module
 228   allocate the private structure and build the list
 229   of partition DNs for use by replmd_notify()
 230  */
 231 static int replmd_init(struct ldb_module *module)
 232 {
 233         struct replmd_private *replmd_private;
 234         struct ldb_context *ldb = ldb_module_get_ctx(module);
 235
 236         replmd_private = talloc_zero(module, struct replmd_private);
 237         if (replmd_private == NULL) {
 238                 ldb_oom(ldb);
 239                 return LDB_ERR_OPERATIONS_ERROR;
 240         }
 241         ldb_module_set_private(module, replmd_private);
 242
 243         return ldb_next_init(module);
 244 }
 245
 246 /*
 247   cleanup our per-transaction contexts
 248  */
 249 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 250 {
 251         talloc_free(replmd_private->la_ctx);
 252         replmd_private->la_list = NULL;
 253         replmd_private->la_ctx = NULL;
 254
 255         talloc_free(replmd_private->bl_ctx);
 256         replmd_private->la_backlinks = NULL;
 257         replmd_private->bl_ctx = NULL;
 258 }
 259
 260
 261 struct la_backlink {
 262         struct la_backlink *next, *prev;
 263         const char *attr_name;
 264         struct GUID forward_guid, target_guid;
 265         bool active;
 266 };
 267
 268 /*
 269   process a backlinks we accumulated during a transaction, adding and
 270   deleting the backlinks from the target objects
 271  */
 272 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl, struct ldb_request *parent)
 273 {
 274         struct ldb_dn *target_dn, *source_dn;
 275         int ret;
 276         struct ldb_context *ldb = ldb_module_get_ctx(module);
 277         struct ldb_message *msg;
 278         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 279         char *dn_string;
 280
 281         /*
 282           - find DN of target
 283           - find DN of source
 284           - construct ldb_message
 285               - either an add or a delete
 286          */
 287         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn, parent);
 288         if (ret != LDB_SUCCESS) {
 289                 DEBUG(2,(__location__ ": WARNING: Failed to find target DN for linked attribute with GUID %s\n",
 290                          GUID_string(bl, &bl->target_guid)));
 291                 return LDB_SUCCESS;
 292         }
 293
 294         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn, parent);
 295         if (ret != LDB_SUCCESS) {
 296                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 297                                        GUID_string(bl, &bl->forward_guid));
 298                 talloc_free(tmp_ctx);
 299                 return ret;
 300         }
 301
 302         msg = ldb_msg_new(tmp_ctx);
 303         if (msg == NULL) {
 304                 ldb_module_oom(module);
 305                 talloc_free(tmp_ctx);
 306                 return LDB_ERR_OPERATIONS_ERROR;
 307         }
 308
 309         /* construct a ldb_message for adding/deleting the backlink */
 310         msg->dn = target_dn;
 311         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 312         if (!dn_string) {
 313                 ldb_module_oom(module);
 314                 talloc_free(tmp_ctx);
 315                 return LDB_ERR_OPERATIONS_ERROR;
 316         }
 317         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 318         if (ret != LDB_SUCCESS) {
 319                 talloc_free(tmp_ctx);
 320                 return ret;
 321         }
 322         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 323
 324         /* a backlink should never be single valued. Unfortunately the
 325            exchange schema has a attribute
 326            msExchBridgeheadedLocalConnectorsDNBL which is single
 327            valued and a backlink. We need to cope with that by
 328            ignoring the single value flag */
 329         msg->elements[0].flags |= LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK;
 330
 331         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE, parent);
 332         if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE && !bl->active) {
 333                 /* we allow LDB_ERR_NO_SUCH_ATTRIBUTE as success to
 334                    cope with possible corruption where the backlink has
 335                    already been removed */
 336                 DEBUG(3,("WARNING: backlink from %s already removed from %s - %s\n",
 337                          ldb_dn_get_linearized(target_dn),
 338                          ldb_dn_get_linearized(source_dn),
 339                          ldb_errstring(ldb)));
 340                 ret = LDB_SUCCESS;
 341         } else if (ret != LDB_SUCCESS) {
 342                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 343                                        bl->active?"add":"remove",
 344                                        ldb_dn_get_linearized(source_dn),
 345                                        ldb_dn_get_linearized(target_dn),
 346                                        ldb_errstring(ldb));
 347                 talloc_free(tmp_ctx);
 348                 return ret;
 349         }
 350         talloc_free(tmp_ctx);
 351         return ret;
 352 }
 353
 354 /*
 355   add a backlink to the list of backlinks to add/delete in the prepare
 356   commit
 357  */
 358 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 359                                struct GUID *forward_guid, struct GUID *target_guid,
 360                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 361 {
 362         const struct dsdb_attribute *target_attr;
 363         struct la_backlink *bl;
 364         struct replmd_private *replmd_private =
 365                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 366
 367         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 368         if (!target_attr) {
 369                 /*
 370                  * windows 2003 has a broken schema where the
 371                  * definition of msDS-IsDomainFor is missing (which is
 372                  * supposed to be the backlink of the
 373                  * msDS-HasDomainNCs attribute
 374                  */
 375                 return LDB_SUCCESS;
 376         }
 377
 378         /* see if its already in the list */
 379         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 380                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 381                     GUID_equal(target_guid, &bl->target_guid) &&
 382                     (target_attr->lDAPDisplayName == bl->attr_name ||
 383                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 384                         break;
 385                 }
 386         }
 387
 388         if (bl) {
 389                 /* we found an existing one */
 390                 if (bl->active == active) {
 391                         return LDB_SUCCESS;
 392                 }
 393                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 394                 talloc_free(bl);
 395                 return LDB_SUCCESS;
 396         }
 397
 398         if (replmd_private->bl_ctx == NULL) {
 399                 replmd_private->bl_ctx = talloc_new(replmd_private);
 400                 if (replmd_private->bl_ctx == NULL) {
 401                         ldb_module_oom(module);
 402                         return LDB_ERR_OPERATIONS_ERROR;
 403                 }
 404         }
 405
 406         /* its a new one */
 407         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 408         if (bl == NULL) {
 409                 ldb_module_oom(module);
 410                 return LDB_ERR_OPERATIONS_ERROR;
 411         }
 412
 413         /* Ensure the schema does not go away before the bl->attr_name is used */
 414         if (!talloc_reference(bl, schema)) {
 415                 talloc_free(bl);
 416                 ldb_module_oom(module);
 417                 return LDB_ERR_OPERATIONS_ERROR;
 418         }
 419
 420         bl->attr_name = target_attr->lDAPDisplayName;
 421         bl->forward_guid = *forward_guid;
 422         bl->target_guid = *target_guid;
 423         bl->active = active;
 424
 425         /* the caller may ask for this backlink to be processed
 426            immediately */
 427         if (immediate) {
 428                 int ret = replmd_process_backlink(module, bl, NULL);
 429                 talloc_free(bl);
 430                 return ret;
 431         }
 432
 433         DLIST_ADD(replmd_private->la_backlinks, bl);
 434
 435         return LDB_SUCCESS;
 436 }
 437
 438
 439 /*
 440  * Callback for most write operations in this module:
 441  *
 442  * notify the repl task that a object has changed. The notifies are
 443  * gathered up in the replmd_private structure then written to the
 444  * @REPLCHANGED object in each partition during the prepare_commit
 445  */
 446 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 447 {
 448         int ret;
 449         struct replmd_replicated_request *ac =
 450                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 451         struct replmd_private *replmd_private =
 452                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 453         struct nc_entry *modified_partition;
 454         struct ldb_control *partition_ctrl;
 455         const struct dsdb_control_current_partition *partition;
 456
 457         struct ldb_control **controls;
 458
 459         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 460
 461         controls = ares->controls;
 462         if (ldb_request_get_control(ac->req,
 463                                     DSDB_CONTROL_CURRENT_PARTITION_OID) == NULL) {
 464                 /*
 465                  * Remove the current partition control from what we pass up
 466                  * the chain if it hasn't been requested manually.
 467                  */
 468                 controls = ldb_controls_except_specified(ares->controls, ares,
 469                                                          partition_ctrl);
 470         }
 471
 472         if (ares->error != LDB_SUCCESS) {
 473                 DEBUG(5,("%s failure. Error is: %s\n", __FUNCTION__, ldb_strerror(ares->error)));
 474                 return ldb_module_done(ac->req, controls,
 475                                         ares->response, ares->error);
 476         }
 477
 478         if (ares->type != LDB_REPLY_DONE) {
 479                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 480                 return ldb_module_done(ac->req, NULL,
 481                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 482         }
 483
 484         if (!partition_ctrl) {
 485                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 486                 return ldb_module_done(ac->req, NULL,
 487                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 488         }
 489
 490         partition = talloc_get_type_abort(partition_ctrl->data,
 491                                     struct dsdb_control_current_partition);
 492
 493         if (ac->seq_num > 0) {
 494                 for (modified_partition = replmd_private->ncs; modified_partition;
 495                      modified_partition = modified_partition->next) {
 496                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 497                                 break;
 498                         }
 499                 }
 500
 501                 if (modified_partition == NULL) {
 502                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 503                         if (!modified_partition) {
 504                                 ldb_oom(ldb_module_get_ctx(ac->module));
 505                                 return ldb_module_done(ac->req, NULL,
 506                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 507                         }
 508                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 509                         if (!modified_partition->dn) {
 510                                 ldb_oom(ldb_module_get_ctx(ac->module));
 511                                 return ldb_module_done(ac->req, NULL,
 512                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 513                         }
 514                         DLIST_ADD(replmd_private->ncs, modified_partition);
 515                 }
 516
 517                 if (ac->seq_num > modified_partition->mod_usn) {
 518                         modified_partition->mod_usn = ac->seq_num;
 519                         if (ac->is_urgent) {
 520                                 modified_partition->mod_usn_urgent = ac->seq_num;
 521                         }
 522                 }
 523         }
 524
 525         if (ac->apply_mode) {
 526                 ret = replmd_replicated_apply_isDeleted(ac);
 527                 if (ret != LDB_SUCCESS) {
 528                         return ldb_module_done(ac->req, NULL, NULL, ret);
 529                 }
 530                 return ret;
 531         } else {
 532                 /* free the partition control container here, for the
 533                  * common path.  Other cases will have it cleaned up
 534                  * eventually with the ares */
 535                 talloc_free(partition_ctrl);
 536                 return ldb_module_done(ac->req, controls,
 537                                        ares->response, LDB_SUCCESS);
 538         }
 539 }
 540
 541
 542 /*
 543  * update a @REPLCHANGED record in each partition if there have been
 544  * any writes of replicated data in the partition
 545  */
 546 static int replmd_notify_store(struct ldb_module *module, struct ldb_request *parent)
 547 {
 548         struct replmd_private *replmd_private =
 549                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 550
 551         while (replmd_private->ncs) {
 552                 int ret;
 553                 struct nc_entry *modified_partition = replmd_private->ncs;
 554
 555                 ret = dsdb_module_save_partition_usn(module, modified_partition->dn,
 556                                                      modified_partition->mod_usn,
 557                                                      modified_partition->mod_usn_urgent, parent);
 558                 if (ret != LDB_SUCCESS) {
 559                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 560                                  ldb_dn_get_linearized(modified_partition->dn)));
 561                         return ret;
 562                 }
 563                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 564                 talloc_free(modified_partition);
 565         }
 566
 567         return LDB_SUCCESS;
 568 }
 569
 570
 571 /*
 572   created a replmd_replicated_request context
 573  */
 574 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 575                                                          struct ldb_request *req)
 576 {
 577         struct ldb_context *ldb;
 578         struct replmd_replicated_request *ac;
 579
 580         ldb = ldb_module_get_ctx(module);
 581
 582         ac = talloc_zero(req, struct replmd_replicated_request);
 583         if (ac == NULL) {
 584                 ldb_oom(ldb);
 585                 return NULL;
 586         }
 587
 588         ac->module = module;
 589         ac->req = req;
 590
 591         ac->schema = dsdb_get_schema(ldb, ac);
 592         if (!ac->schema) {
 593                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 594                               "replmd_modify: no dsdb_schema loaded");
 595                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 596                 return NULL;
 597         }
 598
 599         return ac;
 600 }
 601
 602 /*
 603   add a time element to a record
 604 */
 605 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 606 {
 607         struct ldb_message_element *el;
 608         char *s;
 609         int ret;
 610
 611         if (ldb_msg_find_element(msg, attr) != NULL) {
 612                 return LDB_SUCCESS;
 613         }
 614
 615         s = ldb_timestring(msg, t);
 616         if (s == NULL) {
 617                 return LDB_ERR_OPERATIONS_ERROR;
 618         }
 619
 620         ret = ldb_msg_add_string(msg, attr, s);
 621         if (ret != LDB_SUCCESS) {
 622                 return ret;
 623         }
 624
 625         el = ldb_msg_find_element(msg, attr);
 626         /* always set as replace. This works because on add ops, the flag
 627            is ignored */
 628         el->flags = LDB_FLAG_MOD_REPLACE;
 629
 630         return LDB_SUCCESS;
 631 }
 632
 633 /*
 634   add a uint64_t element to a record
 635 */
 636 static int add_uint64_element(struct ldb_context *ldb, struct ldb_message *msg,
 637                               const char *attr, uint64_t v)
 638 {
 639         struct ldb_message_element *el;
 640         int ret;
 641
 642         if (ldb_msg_find_element(msg, attr) != NULL) {
 643                 return LDB_SUCCESS;
 644         }
 645
 646         ret = samdb_msg_add_uint64(ldb, msg, msg, attr, v);
 647         if (ret != LDB_SUCCESS) {
 648                 return ret;
 649         }
 650
 651         el = ldb_msg_find_element(msg, attr);
 652         /* always set as replace. This works because on add ops, the flag
 653            is ignored */
 654         el->flags = LDB_FLAG_MOD_REPLACE;
 655
 656         return LDB_SUCCESS;
 657 }
 658
 659 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 660                                                    const struct replPropertyMetaData1 *m2,
 661                                                    const uint32_t *rdn_attid)
 662 {
 663         if (m1->attid == m2->attid) {
 664                 return 0;
 665         }
 666
 667         /*
 668          * the rdn attribute should be at the end!
 669          * so we need to return a value greater than zero
 670          * which means m1 is greater than m2
 671          */
 672         if (m1->attid == *rdn_attid) {
 673                 return 1;
 674         }
 675
 676         /*
 677          * the rdn attribute should be at the end!
 678          * so we need to return a value less than zero
 679          * which means m2 is greater than m1
 680          */
 681         if (m2->attid == *rdn_attid) {
 682                 return -1;
 683         }
 684
 685         return m1->attid > m2->attid ? 1 : -1;
 686 }
 687
 688 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 689                                                 const struct dsdb_schema *schema,
 690                                                 struct ldb_dn *dn)
 691 {
 692         const char *rdn_name;
 693         const struct dsdb_attribute *rdn_sa;
 694
 695         rdn_name = ldb_dn_get_rdn_name(dn);
 696         if (!rdn_name) {
 697                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 698                 return LDB_ERR_OPERATIONS_ERROR;
 699         }
 700
 701         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 702         if (rdn_sa == NULL) {
 703                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 704                 return LDB_ERR_OPERATIONS_ERROR;
 705         }
 706
 707         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 708                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 709
 710         LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
 711
 712         return LDB_SUCCESS;
 713 }
 714
 715 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 716                                                  const struct ldb_message_element *e2,
 717                                                  const struct dsdb_schema *schema)
 718 {
 719         const struct dsdb_attribute *a1;
 720         const struct dsdb_attribute *a2;
 721
 722         /*
 723          * TODO: make this faster by caching the dsdb_attribute pointer
 724          *       on the ldb_messag_element
 725          */
 726
 727         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 728         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 729
 730         /*
 731          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 732          *       in the schema
 733          */
 734         if (!a1 || !a2) {
 735                 return strcasecmp(e1->name, e2->name);
 736         }
 737         if (a1->attributeID_id == a2->attributeID_id) {
 738                 return 0;
 739         }
 740         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 741 }
 742
 743 static void replmd_ldb_message_sort(struct ldb_message *msg,
 744                                     const struct dsdb_schema *schema)
 745 {
 746         LDB_TYPESAFE_QSORT(msg->elements, msg->num_elements, schema, replmd_ldb_message_element_attid_sort);
 747 }
 748
 749 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 750                                const struct GUID *invocation_id, uint64_t seq_num,
 751                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 752
 753
 754 /*
 755   fix up linked attributes in replmd_add.
 756   This involves setting up the right meta-data in extended DN
 757   components, and creating backlinks to the object
 758  */
 759 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 760                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 761                              struct GUID *guid, const struct dsdb_attribute *sa, struct ldb_request *parent)
 762 {
 763         unsigned int i;
 764         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 765         struct ldb_context *ldb = ldb_module_get_ctx(module);
 766
 767         /* We will take a reference to the schema in replmd_add_backlink */
 768         const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
 769         NTTIME now;
 770
 771         unix_to_nt_time(&now, t);
 772
 773         for (i=0; i<el->num_values; i++) {
 774                 struct ldb_val *v = &el->values[i];
 775                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 776                 struct GUID target_guid;
 777                 NTSTATUS status;
 778                 int ret;
 779
 780                 /* note that the DN already has the extended
 781                    components from the extended_dn_store module */
 782                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 783                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 784                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid, parent);
 785                         if (ret != LDB_SUCCESS) {
 786                                 talloc_free(tmp_ctx);
 787                                 return ret;
 788                         }
 789                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 790                         if (ret != LDB_SUCCESS) {
 791                                 talloc_free(tmp_ctx);
 792                                 return ret;
 793                         }
 794                 }
 795
 796                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 797                                           seq_num, seq_num, now, 0, false);
 798                 if (ret != LDB_SUCCESS) {
 799                         talloc_free(tmp_ctx);
 800                         return ret;
 801                 }
 802
 803                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 804                 if (ret != LDB_SUCCESS) {
 805                         talloc_free(tmp_ctx);
 806                         return ret;
 807                 }
 808         }
 809
 810         talloc_free(tmp_ctx);
 811         return LDB_SUCCESS;
 812 }
 813
 814
 815 /*
 816   intercept add requests
 817  */
 818 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 819 {
 820         struct samldb_msds_intid_persistant *msds_intid_struct;
 821         struct ldb_context *ldb;
 822         struct ldb_control *control;
 823         struct replmd_replicated_request *ac;
 824         enum ndr_err_code ndr_err;
 825         struct ldb_request *down_req;
 826         struct ldb_message *msg;
 827         const DATA_BLOB *guid_blob;
 828         struct GUID guid;
 829         struct replPropertyMetaDataBlob nmd;
 830         struct ldb_val nmd_value;
 831         const struct GUID *our_invocation_id;
 832         time_t t = time(NULL);
 833         NTTIME now;
 834         char *time_str;
 835         int ret;
 836         unsigned int i;
 837         unsigned int functional_level;
 838         uint32_t ni=0;
 839         bool allow_add_guid = false;
 840         bool remove_current_guid = false;
 841         bool is_urgent = false;
 842         struct ldb_message_element *objectclass_el;
 843
 844         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 845         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 846         if (control) {
 847                 allow_add_guid = true;
 848         }
 849
 850         /* do not manipulate our control entries */
 851         if (ldb_dn_is_special(req->op.add.message->dn)) {
 852                 return ldb_next_request(module, req);
 853         }
 854
 855         ldb = ldb_module_get_ctx(module);
 856
 857         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 858
 859         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 860         if (guid_blob != NULL) {
 861                 if (!allow_add_guid) {
 862                         ldb_set_errstring(ldb,
 863                                           "replmd_add: it's not allowed to add an object with objectGUID!");
 864                         return LDB_ERR_UNWILLING_TO_PERFORM;
 865                 } else {
 866                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 867                         if (!NT_STATUS_IS_OK(status)) {
 868                                 ldb_set_errstring(ldb,
 869                                                   "replmd_add: Unable to parse the 'objectGUID' as a GUID!");
 870                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 871                         }
 872                         /* we remove this attribute as it can be a string and
 873                          * will not be treated correctly and then we will re-add
 874                          * it later on in the good format */
 875                         remove_current_guid = true;
 876                 }
 877         } else {
 878                 /* a new GUID */
 879                 guid = GUID_random();
 880         }
 881
 882         ac = replmd_ctx_init(module, req);
 883         if (ac == NULL) {
 884                 return ldb_module_oom(module);
 885         }
 886
 887         functional_level = dsdb_functional_level(ldb);
 888
 889         /* Get a sequence number from the backend */
 890         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 891         if (ret != LDB_SUCCESS) {
 892                 talloc_free(ac);
 893                 return ret;
 894         }
 895
 896         /* get our invocationId */
 897         our_invocation_id = samdb_ntds_invocation_id(ldb);
 898         if (!our_invocation_id) {
 899                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 900                               "replmd_add: unable to find invocationId\n");
 901                 talloc_free(ac);
 902                 return LDB_ERR_OPERATIONS_ERROR;
 903         }
 904
 905         /* we have to copy the message as the caller might have it as a const */
 906         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 907         if (msg == NULL) {
 908                 ldb_oom(ldb);
 909                 talloc_free(ac);
 910                 return LDB_ERR_OPERATIONS_ERROR;
 911         }
 912
 913         /* generated times */
 914         unix_to_nt_time(&now, t);
 915         time_str = ldb_timestring(msg, t);
 916         if (!time_str) {
 917                 ldb_oom(ldb);
 918                 talloc_free(ac);
 919                 return LDB_ERR_OPERATIONS_ERROR;
 920         }
 921         if (remove_current_guid) {
 922                 ldb_msg_remove_attr(msg,"objectGUID");
 923         }
 924
 925         /*
 926          * remove autogenerated attributes
 927          */
 928         ldb_msg_remove_attr(msg, "whenCreated");
 929         ldb_msg_remove_attr(msg, "whenChanged");
 930         ldb_msg_remove_attr(msg, "uSNCreated");
 931         ldb_msg_remove_attr(msg, "uSNChanged");
 932         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 933
 934         /*
 935          * readd replicated attributes
 936          */
 937         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 938         if (ret != LDB_SUCCESS) {
 939                 ldb_oom(ldb);
 940                 talloc_free(ac);
 941                 return ret;
 942         }
 943
 944         /* build the replication meta_data */
 945         ZERO_STRUCT(nmd);
 946         nmd.version             = 1;
 947         nmd.ctr.ctr1.count      = msg->num_elements;
 948         nmd.ctr.ctr1.array      = talloc_array(msg,
 949                                                struct replPropertyMetaData1,
 950                                                nmd.ctr.ctr1.count);
 951         if (!nmd.ctr.ctr1.array) {
 952                 ldb_oom(ldb);
 953                 talloc_free(ac);
 954                 return LDB_ERR_OPERATIONS_ERROR;
 955         }
 956
 957         for (i=0; i < msg->num_elements; i++) {
 958                 struct ldb_message_element *e = &msg->elements[i];
 959                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 960                 const struct dsdb_attribute *sa;
 961
 962                 if (e->name[0] == '@') continue;
 963
 964                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 965                 if (!sa) {
 966                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 967                                       "replmd_add: attribute '%s' not defined in schema\n",
 968                                       e->name);
 969                         talloc_free(ac);
 970                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 971                 }
 972
 973                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 974                         /* if the attribute is not replicated (0x00000001)
 975                          * or constructed (0x00000004) it has no metadata
 976                          */
 977                         continue;
 978                 }
 979
 980                 if (sa->linkID != 0 && functional_level > DS_DOMAIN_FUNCTION_2000) {
 981                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa, req);
 982                         if (ret != LDB_SUCCESS) {
 983                                 talloc_free(ac);
 984                                 return ret;
 985                         }
 986                         /* linked attributes are not stored in
 987                            replPropertyMetaData in FL above w2k */
 988                         continue;
 989                 }
 990
 991                 m->attid                        = sa->attributeID_id;
 992                 m->version                      = 1;
 993                 if (m->attid == 0x20030) {
 994                         const struct ldb_val *rdn_val = ldb_dn_get_rdn_val(msg->dn);
 995                         const char* rdn;
 996
 997                         if (rdn_val == NULL) {
 998                                 ldb_oom(ldb);
 999                                 talloc_free(ac);
1000                                 return LDB_ERR_OPERATIONS_ERROR;
1001                         }
1002
1003                         rdn = (const char*)rdn_val->data;
1004                         if (strcmp(rdn, "Deleted Objects") == 0) {
1005                                 /*
1006                                  * Set the originating_change_time to 29/12/9999 at 23:59:59
1007                                  * as specified in MS-ADTS 7.1.1.4.2 Deleted Objects Container
1008                                  */
1009                                 m->originating_change_time      = DELETED_OBJECT_CONTAINER_CHANGE_TIME;
1010                         } else {
1011                                 m->originating_change_time      = now;
1012                         }
1013                 } else {
1014                         m->originating_change_time      = now;
1015                 }
1016                 m->originating_invocation_id    = *our_invocation_id;
1017                 m->originating_usn              = ac->seq_num;
1018                 m->local_usn                    = ac->seq_num;
1019                 ni++;
1020         }
1021
1022         /* fix meta data count */
1023         nmd.ctr.ctr1.count = ni;
1024
1025         /*
1026          * sort meta data array, and move the rdn attribute entry to the end
1027          */
1028         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
1029         if (ret != LDB_SUCCESS) {
1030                 talloc_free(ac);
1031                 return ret;
1032         }
1033
1034         /* generated NDR encoded values */
1035         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
1036                                        &nmd,
1037                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1038         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1039                 ldb_oom(ldb);
1040                 talloc_free(ac);
1041                 return LDB_ERR_OPERATIONS_ERROR;
1042         }
1043
1044         /*
1045          * add the autogenerated values
1046          */
1047         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
1048         if (ret != LDB_SUCCESS) {
1049                 ldb_oom(ldb);
1050                 talloc_free(ac);
1051                 return ret;
1052         }
1053         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
1054         if (ret != LDB_SUCCESS) {
1055                 ldb_oom(ldb);
1056                 talloc_free(ac);
1057                 return ret;
1058         }
1059         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
1060         if (ret != LDB_SUCCESS) {
1061                 ldb_oom(ldb);
1062                 talloc_free(ac);
1063                 return ret;
1064         }
1065         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
1066         if (ret != LDB_SUCCESS) {
1067                 ldb_oom(ldb);
1068                 talloc_free(ac);
1069                 return ret;
1070         }
1071         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
1072         if (ret != LDB_SUCCESS) {
1073                 ldb_oom(ldb);
1074                 talloc_free(ac);
1075                 return ret;
1076         }
1077
1078         /*
1079          * sort the attributes by attid before storing the object
1080          */
1081         replmd_ldb_message_sort(msg, ac->schema);
1082
1083         objectclass_el = ldb_msg_find_element(msg, "objectClass");
1084         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
1085                                                         REPL_URGENT_ON_CREATE);
1086
1087         ac->is_urgent = is_urgent;
1088         ret = ldb_build_add_req(&down_req, ldb, ac,
1089                                 msg,
1090                                 req->controls,
1091                                 ac, replmd_op_callback,
1092                                 req);
1093
1094         LDB_REQ_SET_LOCATION(down_req);
1095         if (ret != LDB_SUCCESS) {
1096                 talloc_free(ac);
1097                 return ret;
1098         }
1099
1100         /* current partition control is needed by "replmd_op_callback" */
1101         if (ldb_request_get_control(req, DSDB_CONTROL_CURRENT_PARTITION_OID) == NULL) {
1102                 ret = ldb_request_add_control(down_req,
1103                                               DSDB_CONTROL_CURRENT_PARTITION_OID,
1104                                               false, NULL);
1105                 if (ret != LDB_SUCCESS) {
1106                         talloc_free(ac);
1107                         return ret;
1108                 }
1109         }
1110
1111         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
1112                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
1113                 if (ret != LDB_SUCCESS) {
1114                         talloc_free(ac);
1115                         return ret;
1116                 }
1117         }
1118
1119         /* mark the control done */
1120         if (control) {
1121                 control->critical = 0;
1122         }
1123         if (ldb_dn_compare_base(ac->schema->base_dn, req->op.add.message->dn) != 0) {
1124
1125                 /* Update the usn in the SAMLDB_MSDS_INTID_OPAQUE opaque */
1126                 msds_intid_struct = (struct samldb_msds_intid_persistant *) ldb_get_opaque(ldb, SAMLDB_MSDS_INTID_OPAQUE);
1127                 if (msds_intid_struct) {
1128                         msds_intid_struct->usn = ac->seq_num;
1129                 }
1130         }
1131         /* go on with the call chain */
1132         return ldb_next_request(module, down_req);
1133 }
1134
1135
1136 /*
1137  * update the replPropertyMetaData for one element
1138  */
1139 static int replmd_update_rpmd_element(struct ldb_context *ldb,
1140                                       struct ldb_message *msg,
1141                                       struct ldb_message_element *el,
1142                                       struct ldb_message_element *old_el,
1143                                       struct replPropertyMetaDataBlob *omd,
1144                                       const struct dsdb_schema *schema,
1145                                       uint64_t *seq_num,
1146                                       const struct GUID *our_invocation_id,
1147                                       NTTIME now,
1148                                       struct ldb_request *req)
1149 {
1150         uint32_t i;
1151         const struct dsdb_attribute *a;
1152         struct replPropertyMetaData1 *md1;
1153         bool may_skip = false;
1154
1155         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1156         if (a == NULL) {
1157                 if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID)) {
1158                         /* allow this to make it possible for dbcheck
1159                            to remove bad attributes */
1160                         return LDB_SUCCESS;
1161                 }
1162
1163                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1164                          el->name));
1165                 return LDB_ERR_OPERATIONS_ERROR;
1166         }
1167
1168         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1169                 return LDB_SUCCESS;
1170         }
1171
1172         /*
1173          * if the attribute's value haven't changed, and this isn't
1174          * just a delete of everything then return LDB_SUCCESS Unless
1175          * we have the provision control or if the attribute is
1176          * interSiteTopologyGenerator as this page explain:
1177          * http://support.microsoft.com/kb/224815 this attribute is
1178          * periodicaly written by the DC responsible for the intersite
1179          * generation in a given site
1180          *
1181          * Unchanged could be deleting or replacing an already-gone
1182          * thing with an unconstrained delete/empty replace or a
1183          * replace with the same value, but not an add with the same
1184          * value because that could be about adding a duplicate (which
1185          * is for someone else to error out on).
1186          */
1187         if (old_el != NULL && ldb_msg_element_equal_ordered(el, old_el)) {
1188                 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
1189                         may_skip = true;
1190                 }
1191         } else if (old_el == NULL && el->num_values == 0) {
1192                 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
1193                         may_skip = true;
1194                 } else if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
1195                         may_skip = true;
1196                 }
1197         }
1198
1199         if (may_skip) {
1200                 if (strcmp(el->name, "interSiteTopologyGenerator") != 0 &&
1201                     !ldb_request_get_control(req, LDB_CONTROL_PROVISION_OID)) {
1202                         /*
1203                          * allow this to make it possible for dbcheck
1204                          * to rebuild broken metadata
1205                          */
1206                         return LDB_SUCCESS;
1207                 }
1208         }
1209
1210         for (i=0; i<omd->ctr.ctr1.count; i++) {
1211                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1212         }
1213
1214         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1215                 /* linked attributes are not stored in
1216                    replPropertyMetaData in FL above w2k, but we do
1217                    raise the seqnum for the object  */
1218                 if (*seq_num == 0 &&
1219                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1220                         return LDB_ERR_OPERATIONS_ERROR;
1221                 }
1222                 return LDB_SUCCESS;
1223         }
1224
1225         if (i == omd->ctr.ctr1.count) {
1226                 /* we need to add a new one */
1227                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1228                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1229                 if (omd->ctr.ctr1.array == NULL) {
1230                         ldb_oom(ldb);
1231                         return LDB_ERR_OPERATIONS_ERROR;
1232                 }
1233                 omd->ctr.ctr1.count++;
1234                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1235         }
1236
1237         /* Get a new sequence number from the backend. We only do this
1238          * if we have a change that requires a new
1239          * replPropertyMetaData element
1240          */
1241         if (*seq_num == 0) {
1242                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1243                 if (ret != LDB_SUCCESS) {
1244                         return LDB_ERR_OPERATIONS_ERROR;
1245                 }
1246         }
1247
1248         md1 = &omd->ctr.ctr1.array[i];
1249         md1->version++;
1250         md1->attid                     = a->attributeID_id;
1251         if (md1->attid == 0x20030) {
1252                 const struct ldb_val *rdn_val = ldb_dn_get_rdn_val(msg->dn);
1253                 const char* rdn;
1254
1255                 if (rdn_val == NULL) {
1256                         ldb_oom(ldb);
1257                         return LDB_ERR_OPERATIONS_ERROR;
1258                 }
1259
1260                 rdn = (const char*)rdn_val->data;
1261                 if (strcmp(rdn, "Deleted Objects") == 0) {
1262                         /*
1263                          * Set the originating_change_time to 29/12/9999 at 23:59:59
1264                          * as specified in MS-ADTS 7.1.1.4.2 Deleted Objects Container
1265                          */
1266                         md1->originating_change_time    = DELETED_OBJECT_CONTAINER_CHANGE_TIME;
1267                 } else {
1268                         md1->originating_change_time    = now;
1269                 }
1270         } else {
1271                 md1->originating_change_time    = now;
1272         }
1273         md1->originating_invocation_id = *our_invocation_id;
1274         md1->originating_usn           = *seq_num;
1275         md1->local_usn                 = *seq_num;
1276
1277         return LDB_SUCCESS;
1278 }
1279
1280 static uint64_t find_max_local_usn(struct replPropertyMetaDataBlob omd)
1281 {
1282         uint32_t count = omd.ctr.ctr1.count;
1283         uint64_t max = 0;
1284         uint32_t i;
1285         for (i=0; i < count; i++) {
1286                 struct replPropertyMetaData1 m = omd.ctr.ctr1.array[i];
1287                 if (max < m.local_usn) {
1288                         max = m.local_usn;
1289                 }
1290         }
1291         return max;
1292 }
1293
1294 /*
1295  * update the replPropertyMetaData object each time we modify an
1296  * object. This is needed for DRS replication, as the merge on the
1297  * client is based on this object
1298  */
1299 static int replmd_update_rpmd(struct ldb_module *module,
1300                               const struct dsdb_schema *schema,
1301                               struct ldb_request *req,
1302                               const char * const *rename_attrs,
1303                               struct ldb_message *msg, uint64_t *seq_num,
1304                               time_t t,
1305                               bool *is_urgent, bool *rodc)
1306 {
1307         const struct ldb_val *omd_value;
1308         enum ndr_err_code ndr_err;
1309         struct replPropertyMetaDataBlob omd;
1310         unsigned int i;
1311         NTTIME now;
1312         const struct GUID *our_invocation_id;
1313         int ret;
1314         const char * const *attrs = NULL;
1315         const char * const attrs1[] = { "replPropertyMetaData", "*", NULL };
1316         const char * const attrs2[] = { "uSNChanged", "objectClass", "instanceType", NULL };
1317         struct ldb_result *res;
1318         struct ldb_context *ldb;
1319         struct ldb_message_element *objectclass_el;
1320         enum urgent_situation situation;
1321         bool rmd_is_provided;
1322
1323         if (rename_attrs) {
1324                 attrs = rename_attrs;
1325         } else {
1326                 attrs = attrs1;
1327         }
1328
1329         ldb = ldb_module_get_ctx(module);
1330
1331         our_invocation_id = samdb_ntds_invocation_id(ldb);
1332         if (!our_invocation_id) {
1333                 /* this happens during an initial vampire while
1334                    updating the schema */
1335                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1336                 return LDB_SUCCESS;
1337         }
1338
1339         unix_to_nt_time(&now, t);
1340
1341         if (ldb_request_get_control(req, DSDB_CONTROL_CHANGEREPLMETADATA_OID)) {
1342                 rmd_is_provided = true;
1343         } else {
1344                 rmd_is_provided = false;
1345         }
1346
1347         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1348          * otherwise we consider we are updating */
1349         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1350                 situation = REPL_URGENT_ON_DELETE;
1351         } else if (rename_attrs) {
1352                 situation = REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE;
1353         } else {
1354                 situation = REPL_URGENT_ON_UPDATE;
1355         }
1356
1357         if (rmd_is_provided) {
1358                 /* In this case the change_replmetadata control was supplied */
1359                 /* We check that it's the only attribute that is provided
1360                  * (it's a rare case so it's better to keep the code simplier)
1361                  * We also check that the highest local_usn is bigger than
1362                  * uSNChanged. */
1363                 uint64_t db_seq;
1364                 if( msg->num_elements != 1 ||
1365                         strncmp(msg->elements[0].name,
1366                                 "replPropertyMetaData", 20) ) {
1367                         DEBUG(0,(__location__ ": changereplmetada control called without "\
1368                                 "a specified replPropertyMetaData attribute or with others\n"));
1369                         return LDB_ERR_OPERATIONS_ERROR;
1370                 }
1371                 if (situation != REPL_URGENT_ON_UPDATE) {
1372                         DEBUG(0,(__location__ ": changereplmetada control can't be called when deleting an object\n"));
1373                         return LDB_ERR_OPERATIONS_ERROR;
1374                 }
1375                 omd_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
1376                 if (!omd_value) {
1377                         DEBUG(0,(__location__ ": replPropertyMetaData was not specified for Object %s\n",
1378                                  ldb_dn_get_linearized(msg->dn)));
1379                         return LDB_ERR_OPERATIONS_ERROR;
1380                 }
1381                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1382                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1383                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1384                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1385                                  ldb_dn_get_linearized(msg->dn)));
1386                         return LDB_ERR_OPERATIONS_ERROR;
1387                 }
1388                 *seq_num = find_max_local_usn(omd);
1389
1390                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs2,
1391                                             DSDB_FLAG_NEXT_MODULE |
1392                                             DSDB_SEARCH_SHOW_RECYCLED |
1393                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1394                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1395                                             DSDB_SEARCH_REVEAL_INTERNALS, req);
1396
1397                 if (ret != LDB_SUCCESS) {
1398                         return ret;
1399                 }
1400
1401                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1402                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1403                                                                 situation)) {
1404                         *is_urgent = true;
1405                 }
1406
1407                 db_seq = ldb_msg_find_attr_as_uint64(res->msgs[0], "uSNChanged", 0);
1408                 if (*seq_num <= db_seq) {
1409                         DEBUG(0,(__location__ ": changereplmetada control provided but max(local_usn)"\
1410                                               " is less or equal to uSNChanged (max = %lld uSNChanged = %lld)\n",
1411                                  (long long)*seq_num, (long long)db_seq));
1412                         return LDB_ERR_OPERATIONS_ERROR;
1413                 }
1414
1415         } else {
1416                 /* search for the existing replPropertyMetaDataBlob. We need
1417                  * to use REVEAL and ask for DNs in storage format to support
1418                  * the check for values being the same in
1419                  * replmd_update_rpmd_element()
1420                  */
1421                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
1422                                             DSDB_FLAG_NEXT_MODULE |
1423                                             DSDB_SEARCH_SHOW_RECYCLED |
1424                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1425                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1426                                             DSDB_SEARCH_REVEAL_INTERNALS, req);
1427                 if (ret != LDB_SUCCESS) {
1428                         return ret;
1429                 }
1430
1431                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1432                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1433                                                                 situation)) {
1434                         *is_urgent = true;
1435                 }
1436
1437                 omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1438                 if (!omd_value) {
1439                         DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1440                                  ldb_dn_get_linearized(msg->dn)));
1441                         return LDB_ERR_OPERATIONS_ERROR;
1442                 }
1443
1444                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1445                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1446                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1447                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1448                                  ldb_dn_get_linearized(msg->dn)));
1449                         return LDB_ERR_OPERATIONS_ERROR;
1450                 }
1451
1452                 if (omd.version != 1) {
1453                         DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1454                                  omd.version, ldb_dn_get_linearized(msg->dn)));
1455                         return LDB_ERR_OPERATIONS_ERROR;
1456                 }
1457
1458                 for (i=0; i<msg->num_elements; i++) {
1459                         struct ldb_message_element *old_el;
1460                         old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1461                         ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1462                                                          our_invocation_id, now, req);
1463                         if (ret != LDB_SUCCESS) {
1464                                 return ret;
1465                         }
1466
1467                         if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1468                                 *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1469                         }
1470
1471                 }
1472         }
1473         /*
1474          * replmd_update_rpmd_element has done an update if the
1475          * seq_num is set
1476          */
1477         if (*seq_num != 0) {
1478                 struct ldb_val *md_value;
1479                 struct ldb_message_element *el;
1480
1481                 /*if we are RODC and this is a DRSR update then its ok*/
1482                 if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)
1483                     && !ldb_request_get_control(req, DSDB_CONTROL_DBCHECK_MODIFY_RO_REPLICA)) {
1484                         unsigned instanceType;
1485
1486                         ret = samdb_rodc(ldb, rodc);
1487                         if (ret != LDB_SUCCESS) {
1488                                 DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
1489                         } else if (*rodc) {
1490                                 ldb_set_errstring(ldb, "RODC modify is forbidden!");
1491                                 return LDB_ERR_REFERRAL;
1492                         }
1493
1494                         instanceType = ldb_msg_find_attr_as_uint(res->msgs[0], "instanceType", INSTANCE_TYPE_WRITE);
1495                         if (!(instanceType & INSTANCE_TYPE_WRITE)) {
1496                                 return ldb_error(ldb, LDB_ERR_UNWILLING_TO_PERFORM,
1497                                                  "cannot change replicated attribute on partial replica");
1498                         }
1499                 }
1500
1501                 md_value = talloc(msg, struct ldb_val);
1502                 if (md_value == NULL) {
1503                         ldb_oom(ldb);
1504                         return LDB_ERR_OPERATIONS_ERROR;
1505                 }
1506
1507                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1508                 if (ret != LDB_SUCCESS) {
1509                         return ret;
1510                 }
1511
1512                 ndr_err = ndr_push_struct_blob(md_value, msg, &omd,
1513                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1514                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1515                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1516                                  ldb_dn_get_linearized(msg->dn)));
1517                         return LDB_ERR_OPERATIONS_ERROR;
1518                 }
1519
1520                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1521                 if (ret != LDB_SUCCESS) {
1522                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1523                                  ldb_dn_get_linearized(msg->dn)));
1524                         return ret;
1525                 }
1526
1527                 el->num_values = 1;
1528                 el->values = md_value;
1529         }
1530
1531         return LDB_SUCCESS;
1532 }
1533
1534 struct parsed_dn {
1535         struct dsdb_dn *dsdb_dn;
1536         struct GUID *guid;
1537         struct ldb_val *v;
1538 };
1539
1540 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1541 {
1542         return GUID_compare(pdn1->guid, pdn2->guid);
1543 }
1544
1545 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn,
1546                                         unsigned int count, struct GUID *guid,
1547                                         struct ldb_dn *dn)
1548 {
1549         struct parsed_dn *ret;
1550         unsigned int i;
1551         if (dn && GUID_all_zero(guid)) {
1552                 /* when updating a link using DRS, we sometimes get a
1553                    NULL GUID. We then need to try and match by DN */
1554                 for (i=0; i<count; i++) {
1555                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1556                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1557                                 return &pdn[i];
1558                         }
1559                 }
1560                 return NULL;
1561         }
1562         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1563         return ret;
1564 }
1565
1566 /*
1567   get a series of message element values as an array of DNs and GUIDs
1568   the result is sorted by GUID
1569  */
1570 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1571                           struct ldb_message_element *el, struct parsed_dn **pdn,
1572                           const char *ldap_oid, struct ldb_request *parent)
1573 {
1574         unsigned int i;
1575         struct ldb_context *ldb = ldb_module_get_ctx(module);
1576
1577         if (el == NULL) {
1578                 *pdn = NULL;
1579                 return LDB_SUCCESS;
1580         }
1581
1582         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1583         if (!*pdn) {
1584                 ldb_module_oom(module);
1585                 return LDB_ERR_OPERATIONS_ERROR;
1586         }
1587
1588         for (i=0; i<el->num_values; i++) {
1589                 struct ldb_val *v = &el->values[i];
1590                 NTSTATUS status;
1591                 struct ldb_dn *dn;
1592                 struct parsed_dn *p;
1593
1594                 p = &(*pdn)[i];
1595
1596                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1597                 if (p->dsdb_dn == NULL) {
1598                         return LDB_ERR_INVALID_DN_SYNTAX;
1599                 }
1600
1601                 dn = p->dsdb_dn->dn;
1602
1603                 p->guid = talloc(*pdn, struct GUID);
1604                 if (p->guid == NULL) {
1605                         ldb_module_oom(module);
1606                         return LDB_ERR_OPERATIONS_ERROR;
1607                 }
1608
1609                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1610                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1611                         /* we got a DN without a GUID - go find the GUID */
1612                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid, parent);
1613                         if (ret != LDB_SUCCESS) {
1614                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1615                                                        ldb_dn_get_linearized(dn));
1616                                 if (ret == LDB_ERR_NO_SUCH_OBJECT &&
1617                                     LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE &&
1618                                     ldb_attr_cmp(el->name, "member") == 0) {
1619                                         return LDB_ERR_UNWILLING_TO_PERFORM;
1620                                 }
1621                                 return ret;
1622                         }
1623                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1624                         if (ret != LDB_SUCCESS) {
1625                                 return ret;
1626                         }
1627                 } else if (!NT_STATUS_IS_OK(status)) {
1628                         return LDB_ERR_OPERATIONS_ERROR;
1629                 }
1630
1631                 /* keep a pointer to the original ldb_val */
1632                 p->v = v;
1633         }
1634
1635         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1636
1637         return LDB_SUCCESS;
1638 }
1639
1640 /*
1641   build a new extended DN, including all meta data fields
1642
1643   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1644   RMD_ADDTIME         = originating_add_time
1645   RMD_INVOCID         = originating_invocation_id
1646   RMD_CHANGETIME      = originating_change_time
1647   RMD_ORIGINATING_USN = originating_usn
1648   RMD_LOCAL_USN       = local_usn
1649   RMD_VERSION         = version
1650  */
1651 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1652                                const struct GUID *invocation_id, uint64_t seq_num,
1653                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1654 {
1655         struct ldb_dn *dn = dsdb_dn->dn;
1656         const char *tstring, *usn_string, *flags_string;
1657         struct ldb_val tval;
1658         struct ldb_val iid;
1659         struct ldb_val usnv, local_usnv;
1660         struct ldb_val vers, flagsv;
1661         NTSTATUS status;
1662         int ret;
1663         const char *dnstring;
1664         char *vstring;
1665         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1666
1667         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1668         if (!tstring) {
1669                 return LDB_ERR_OPERATIONS_ERROR;
1670         }
1671         tval = data_blob_string_const(tstring);
1672
1673         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1674         if (!usn_string) {
1675                 return LDB_ERR_OPERATIONS_ERROR;
1676         }
1677         usnv = data_blob_string_const(usn_string);
1678
1679         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1680         if (!usn_string) {
1681                 return LDB_ERR_OPERATIONS_ERROR;
1682         }
1683         local_usnv = data_blob_string_const(usn_string);
1684
1685         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1686         if (!vstring) {
1687                 return LDB_ERR_OPERATIONS_ERROR;
1688         }
1689         vers = data_blob_string_const(vstring);
1690
1691         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1692         if (!NT_STATUS_IS_OK(status)) {
1693                 return LDB_ERR_OPERATIONS_ERROR;
1694         }
1695
1696         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1697         if (!flags_string) {
1698                 return LDB_ERR_OPERATIONS_ERROR;
1699         }
1700         flagsv = data_blob_string_const(flags_string);
1701
1702         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1703         if (ret != LDB_SUCCESS) return ret;
1704         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1705         if (ret != LDB_SUCCESS) return ret;
1706         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1707         if (ret != LDB_SUCCESS) return ret;
1708         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1709         if (ret != LDB_SUCCESS) return ret;
1710         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1711         if (ret != LDB_SUCCESS) return ret;
1712         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1713         if (ret != LDB_SUCCESS) return ret;
1714         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1715         if (ret != LDB_SUCCESS) return ret;
1716
1717         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1718         if (dnstring == NULL) {
1719                 return LDB_ERR_OPERATIONS_ERROR;
1720         }
1721         *v = data_blob_string_const(dnstring);
1722
1723         return LDB_SUCCESS;
1724 }
1725
1726 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1727                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1728                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1729                                 uint32_t version, bool deleted);
1730
1731 /*
1732   check if any links need upgrading from w2k format
1733
1734   The parent_ctx is the ldb_message_element which contains the values array that dns[i].v points at, and which should be used for allocating any new value.
1735  */
1736 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1737 {
1738         uint32_t i;
1739         for (i=0; i<count; i++) {
1740                 NTSTATUS status;
1741                 uint32_t version;
1742                 int ret;
1743
1744                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1745                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1746                         continue;
1747                 }
1748
1749                 /* it's an old one that needs upgrading */
1750                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1751                                            1, 1, 0, 0, false);
1752                 if (ret != LDB_SUCCESS) {
1753                         return ret;
1754                 }
1755         }
1756         return LDB_SUCCESS;
1757 }
1758
1759 /*
1760   update an extended DN, including all meta data fields
1761
1762   see replmd_build_la_val for value names
1763  */
1764 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1765                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1766                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1767                                 uint32_t version, bool deleted)
1768 {
1769         struct ldb_dn *dn = dsdb_dn->dn;
1770         const char *tstring, *usn_string, *flags_string;
1771         struct ldb_val tval;
1772         struct ldb_val iid;
1773         struct ldb_val usnv, local_usnv;
1774         struct ldb_val vers, flagsv;
1775         const struct ldb_val *old_addtime;
1776         uint32_t old_version;
1777         NTSTATUS status;
1778         int ret;
1779         const char *dnstring;
1780         char *vstring;
1781         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1782
1783         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1784         if (!tstring) {
1785                 return LDB_ERR_OPERATIONS_ERROR;
1786         }
1787         tval = data_blob_string_const(tstring);
1788
1789         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1790         if (!usn_string) {
1791                 return LDB_ERR_OPERATIONS_ERROR;
1792         }
1793         usnv = data_blob_string_const(usn_string);
1794
1795         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1796         if (!usn_string) {
1797                 return LDB_ERR_OPERATIONS_ERROR;
1798         }
1799         local_usnv = data_blob_string_const(usn_string);
1800
1801         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1802         if (!NT_STATUS_IS_OK(status)) {
1803                 return LDB_ERR_OPERATIONS_ERROR;
1804         }
1805
1806         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1807         if (!flags_string) {
1808                 return LDB_ERR_OPERATIONS_ERROR;
1809         }
1810         flagsv = data_blob_string_const(flags_string);
1811
1812         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1813         if (ret != LDB_SUCCESS) return ret;
1814
1815         /* get the ADDTIME from the original */
1816         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1817         if (old_addtime == NULL) {
1818                 old_addtime = &tval;
1819         }
1820         if (dsdb_dn != old_dsdb_dn ||
1821             ldb_dn_get_extended_component(dn, "RMD_ADDTIME") == NULL) {
1822                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1823                 if (ret != LDB_SUCCESS) return ret;
1824         }
1825
1826         /* use our invocation id */
1827         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1828         if (ret != LDB_SUCCESS) return ret;
1829
1830         /* changetime is the current time */
1831         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1832         if (ret != LDB_SUCCESS) return ret;
1833
1834         /* update the USN */
1835         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1836         if (ret != LDB_SUCCESS) return ret;
1837
1838         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1839         if (ret != LDB_SUCCESS) return ret;
1840
1841         /* increase the version by 1 */
1842         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1843         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1844                 version = old_version+1;
1845         }
1846         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1847         vers = data_blob_string_const(vstring);
1848         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1849         if (ret != LDB_SUCCESS) return ret;
1850
1851         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1852         if (dnstring == NULL) {
1853                 return LDB_ERR_OPERATIONS_ERROR;
1854         }
1855         *v = data_blob_string_const(dnstring);
1856
1857         return LDB_SUCCESS;
1858 }
1859
1860 /*
1861   handle adding a linked attribute
1862  */
1863 static int replmd_modify_la_add(struct ldb_module *module,
1864                                 const struct dsdb_schema *schema,
1865                                 struct ldb_message *msg,
1866                                 struct ldb_message_element *el,
1867                                 struct ldb_message_element *old_el,
1868                                 const struct dsdb_attribute *schema_attr,
1869                                 uint64_t seq_num,
1870                                 time_t t,
1871                                 struct GUID *msg_guid,
1872                                 struct ldb_request *parent)
1873 {
1874         unsigned int i;
1875         struct parsed_dn *dns, *old_dns;
1876         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1877         int ret;
1878         struct ldb_val *new_values = NULL;
1879         unsigned int num_new_values = 0;
1880         unsigned old_num_values = old_el?old_el->num_values:0;
1881         const struct GUID *invocation_id;
1882         struct ldb_context *ldb = ldb_module_get_ctx(module);
1883         NTTIME now;
1884
1885         unix_to_nt_time(&now, t);
1886
1887         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
1888         if (ret != LDB_SUCCESS) {
1889                 talloc_free(tmp_ctx);
1890                 return ret;
1891         }
1892
1893         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
1894         if (ret != LDB_SUCCESS) {
1895                 talloc_free(tmp_ctx);
1896                 return ret;
1897         }
1898
1899         invocation_id = samdb_ntds_invocation_id(ldb);
1900         if (!invocation_id) {
1901                 talloc_free(tmp_ctx);
1902                 return LDB_ERR_OPERATIONS_ERROR;
1903         }
1904
1905         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1906         if (ret != LDB_SUCCESS) {
1907                 talloc_free(tmp_ctx);
1908                 return ret;
1909         }
1910
1911         /* for each new value, see if it exists already with the same GUID */
1912         for (i=0; i<el->num_values; i++) {
1913                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1914                 if (p == NULL) {
1915                         /* this is a new linked attribute value */
1916                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1917                         if (new_values == NULL) {
1918                                 ldb_module_oom(module);
1919                                 talloc_free(tmp_ctx);
1920                                 return LDB_ERR_OPERATIONS_ERROR;
1921                         }
1922                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1923                                                   invocation_id, seq_num, seq_num, now, 0, false);
1924                         if (ret != LDB_SUCCESS) {
1925                                 talloc_free(tmp_ctx);
1926                                 return ret;
1927                         }
1928                         num_new_values++;
1929                 } else {
1930                         /* this is only allowed if the GUID was
1931                            previously deleted. */
1932                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1933
1934                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1935                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1936                                                        el->name, GUID_string(tmp_ctx, p->guid));
1937                                 talloc_free(tmp_ctx);
1938                                 /* error codes for 'member' need to be
1939                                    special cased */
1940                                 if (ldb_attr_cmp(el->name, "member") == 0) {
1941                                         return LDB_ERR_ENTRY_ALREADY_EXISTS;
1942                                 } else {
1943                                         return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1944                                 }
1945                         }
1946                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1947                                                    invocation_id, seq_num, seq_num, now, 0, false);
1948                         if (ret != LDB_SUCCESS) {
1949                                 talloc_free(tmp_ctx);
1950                                 return ret;
1951                         }
1952                 }
1953
1954                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1955                 if (ret != LDB_SUCCESS) {
1956                         talloc_free(tmp_ctx);
1957                         return ret;
1958                 }
1959         }
1960
1961         /* add the new ones on to the end of the old values, constructing a new el->values */
1962         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1963                                     struct ldb_val,
1964                                     old_num_values+num_new_values);
1965         if (el->values == NULL) {
1966                 ldb_module_oom(module);
1967                 return LDB_ERR_OPERATIONS_ERROR;
1968         }
1969
1970         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1971         el->num_values = old_num_values + num_new_values;
1972
1973         talloc_steal(msg->elements, el->values);
1974         talloc_steal(el->values, new_values);
1975
1976         talloc_free(tmp_ctx);
1977
1978         /* we now tell the backend to replace all existing values
1979            with the one we have constructed */
1980         el->flags = LDB_FLAG_MOD_REPLACE;
1981
1982         return LDB_SUCCESS;
1983 }
1984
1985
1986 /*
1987   handle deleting all active linked attributes
1988  */
1989 static int replmd_modify_la_delete(struct ldb_module *module,
1990                                    const struct dsdb_schema *schema,
1991                                    struct ldb_message *msg,
1992                                    struct ldb_message_element *el,
1993                                    struct ldb_message_element *old_el,
1994                                    const struct dsdb_attribute *schema_attr,
1995                                    uint64_t seq_num,
1996                                    time_t t,
1997                                    struct GUID *msg_guid,
1998                                    struct ldb_request *parent)
1999 {
2000         unsigned int i;
2001         struct parsed_dn *dns, *old_dns;
2002         TALLOC_CTX *tmp_ctx = talloc_new(msg);
2003         int ret;
2004         const struct GUID *invocation_id;
2005         struct ldb_context *ldb = ldb_module_get_ctx(module);
2006         NTTIME now;
2007
2008         unix_to_nt_time(&now, t);
2009
2010         /* check if there is nothing to delete */
2011         if ((!old_el || old_el->num_values == 0) &&
2012             el->num_values == 0) {
2013                 return LDB_SUCCESS;
2014         }
2015
2016         if (!old_el || old_el->num_values == 0) {
2017                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
2018         }
2019
2020         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
2021         if (ret != LDB_SUCCESS) {
2022                 talloc_free(tmp_ctx);
2023                 return ret;
2024         }
2025
2026         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
2027         if (ret != LDB_SUCCESS) {
2028                 talloc_free(tmp_ctx);
2029                 return ret;
2030         }
2031
2032         invocation_id = samdb_ntds_invocation_id(ldb);
2033         if (!invocation_id) {
2034                 return LDB_ERR_OPERATIONS_ERROR;
2035         }
2036
2037         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
2038         if (ret != LDB_SUCCESS) {
2039                 talloc_free(tmp_ctx);
2040                 return ret;
2041         }
2042
2043         el->values = NULL;
2044
2045         /* see if we are being asked to delete any links that
2046            don't exist or are already deleted */
2047         for (i=0; i<el->num_values; i++) {
2048                 struct parsed_dn *p = &dns[i];
2049                 struct parsed_dn *p2;
2050                 uint32_t rmd_flags;
2051
2052                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
2053                 if (!p2) {
2054                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
2055                                                el->name, GUID_string(tmp_ctx, p->guid));
2056                         if (ldb_attr_cmp(el->name, "member") == 0) {
2057                                 return LDB_ERR_UNWILLING_TO_PERFORM;
2058                         } else {
2059                                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
2060                         }
2061                 }
2062                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
2063                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
2064                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
2065                                                el->name, GUID_string(tmp_ctx, p->guid));
2066                         if (ldb_attr_cmp(el->name, "member") == 0) {
2067                                 return LDB_ERR_UNWILLING_TO_PERFORM;
2068                         } else {
2069                                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
2070                         }
2071                 }
2072         }
2073
2074         /* for each new value, see if it exists already with the same GUID
2075            if it is not already deleted and matches the delete list then delete it
2076         */
2077         for (i=0; i<old_el->num_values; i++) {
2078                 struct parsed_dn *p = &old_dns[i];
2079                 uint32_t rmd_flags;
2080
2081                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
2082                         continue;
2083                 }
2084
2085                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
2086                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
2087
2088                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
2089                                            invocation_id, seq_num, seq_num, now, 0, true);
2090                 if (ret != LDB_SUCCESS) {
2091                         talloc_free(tmp_ctx);
2092                         return ret;
2093                 }
2094
2095                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
2096                 if (ret != LDB_SUCCESS) {
2097                         talloc_free(tmp_ctx);
2098                         return ret;
2099                 }
2100         }
2101
2102         el->values = talloc_steal(msg->elements, old_el->values);
2103         el->num_values = old_el->num_values;
2104
2105         talloc_free(tmp_ctx);
2106
2107         /* we now tell the backend to replace all existing values
2108            with the one we have constructed */
2109         el->flags = LDB_FLAG_MOD_REPLACE;
2110
2111         return LDB_SUCCESS;
2112 }
2113
2114 /*
2115   handle replacing a linked attribute
2116  */
2117 static int replmd_modify_la_replace(struct ldb_module *module,
2118                                     const struct dsdb_schema *schema,
2119                                     struct ldb_message *msg,
2120                                     struct ldb_message_element *el,
2121                                     struct ldb_message_element *old_el,
2122                                     const struct dsdb_attribute *schema_attr,
2123                                     uint64_t seq_num,
2124                                     time_t t,
2125                                     struct GUID *msg_guid,
2126                                     struct ldb_request *parent)
2127 {
2128         unsigned int i;
2129         struct parsed_dn *dns, *old_dns;
2130         TALLOC_CTX *tmp_ctx = talloc_new(msg);
2131         int ret;
2132         const struct GUID *invocation_id;
2133         struct ldb_context *ldb = ldb_module_get_ctx(module);
2134         struct ldb_val *new_values = NULL;
2135         unsigned int num_new_values = 0;
2136         unsigned int old_num_values = old_el?old_el->num_values:0;
2137         NTTIME now;
2138
2139         unix_to_nt_time(&now, t);
2140
2141         /* check if there is nothing to replace */
2142         if ((!old_el || old_el->num_values == 0) &&
2143             el->num_values == 0) {
2144                 return LDB_SUCCESS;
2145         }
2146
2147         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
2148         if (ret != LDB_SUCCESS) {
2149                 talloc_free(tmp_ctx);
2150                 return ret;
2151         }
2152
2153         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
2154         if (ret != LDB_SUCCESS) {
2155                 talloc_free(tmp_ctx);
2156                 return ret;
2157         }
2158
2159         invocation_id = samdb_ntds_invocation_id(ldb);
2160         if (!invocation_id) {
2161                 return LDB_ERR_OPERATIONS_ERROR;
2162         }
2163
2164         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
2165         if (ret != LDB_SUCCESS) {
2166                 talloc_free(tmp_ctx);
2167                 return ret;
2168         }
2169
2170         /* mark all the old ones as deleted */
2171         for (i=0; i<old_num_values; i++) {
2172                 struct parsed_dn *old_p = &old_dns[i];
2173                 struct parsed_dn *p;
2174                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
2175
2176                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
2177
2178                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
2179                 if (ret != LDB_SUCCESS) {
2180                         talloc_free(tmp_ctx);
2181                         return ret;
2182                 }
2183
2184                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
2185                 if (p) {
2186                         /* we don't delete it if we are re-adding it */
2187                         continue;
2188                 }
2189
2190                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
2191                                            invocation_id, seq_num, seq_num, now, 0, true);
2192                 if (ret != LDB_SUCCESS) {
2193                         talloc_free(tmp_ctx);
2194                         return ret;
2195                 }
2196         }
2197
2198         /* for each new value, either update its meta-data, or add it
2199          * to old_el
2200         */
2201         for (i=0; i<el->num_values; i++) {
2202                 struct parsed_dn *p = &dns[i], *old_p;
2203
2204                 if (old_dns &&
2205                     (old_p = parsed_dn_find(old_dns,
2206                                             old_num_values, p->guid, NULL)) != NULL) {
2207                         /* update in place */
2208                         ret = replmd_update_la_val(old_el->values, old_p->v, p->dsdb_dn,
2209                                                    old_p->dsdb_dn, invocation_id,
2210                                                    seq_num, seq_num, now, 0, false);
2211                         if (ret != LDB_SUCCESS) {
2212                                 talloc_free(tmp_ctx);
2213                                 return ret;
2214                         }
2215                 } else {
2216                         /* add a new one */
2217                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
2218                                                     num_new_values+1);
2219                         if (new_values == NULL) {
2220                                 ldb_module_oom(module);
2221                                 talloc_free(tmp_ctx);
2222                                 return LDB_ERR_OPERATIONS_ERROR;
2223                         }
2224                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
2225                                                   invocation_id, seq_num, seq_num, now, 0, false);
2226                         if (ret != LDB_SUCCESS) {
2227                                 talloc_free(tmp_ctx);
2228                                 return ret;
2229                         }
2230                         num_new_values++;
2231                 }
2232
2233                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
2234                 if (ret != LDB_SUCCESS) {
2235                         talloc_free(tmp_ctx);
2236                         return ret;
2237                 }
2238         }
2239
2240         /* add the new values to the end of old_el */
2241         if (num_new_values != 0) {
2242                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
2243                                             struct ldb_val, old_num_values+num_new_values);
2244                 if (el->values == NULL) {
2245                         ldb_module_oom(module);
2246                         return LDB_ERR_OPERATIONS_ERROR;
2247                 }
2248                 memcpy(&el->values[old_num_values], &new_values[0],
2249                        sizeof(struct ldb_val)*num_new_values);
2250                 el->num_values = old_num_values + num_new_values;
2251                 talloc_steal(msg->elements, new_values);
2252         } else {
2253                 el->values = old_el->values;
2254                 el->num_values = old_el->num_values;
2255                 talloc_steal(msg->elements, el->values);
2256         }
2257
2258         talloc_free(tmp_ctx);
2259
2260         /* we now tell the backend to replace all existing values
2261            with the one we have constructed */
2262         el->flags = LDB_FLAG_MOD_REPLACE;
2263
2264         return LDB_SUCCESS;
2265 }
2266
2267
2268 /*
2269   handle linked attributes in modify requests
2270  */
2271 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
2272                                                struct ldb_message *msg,
2273                                                uint64_t seq_num, time_t t,
2274                                                struct ldb_request *parent)
2275 {
2276         struct ldb_result *res;
2277         unsigned int i;
2278         int ret;
2279         struct ldb_context *ldb = ldb_module_get_ctx(module);
2280         struct ldb_message *old_msg;
2281
2282         const struct dsdb_schema *schema;
2283         struct GUID old_guid;
2284
2285         if (seq_num == 0) {
2286                 /* there the replmd_update_rpmd code has already
2287                  * checked and saw that there are no linked
2288                  * attributes */
2289                 return LDB_SUCCESS;
2290         }
2291
2292         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
2293                 /* don't do anything special for linked attributes */
2294                 return LDB_SUCCESS;
2295         }
2296
2297         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
2298                                     DSDB_FLAG_NEXT_MODULE |
2299                                     DSDB_SEARCH_SHOW_RECYCLED |
2300                                     DSDB_SEARCH_REVEAL_INTERNALS |
2301                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT,
2302                                     parent);
2303         if (ret != LDB_SUCCESS) {
2304                 return ret;
2305         }
2306         schema = dsdb_get_schema(ldb, res);
2307         if (!schema) {
2308                 return LDB_ERR_OPERATIONS_ERROR;
2309         }
2310
2311         old_msg = res->msgs[0];
2312
2313         old_guid = samdb_result_guid(old_msg, "objectGUID");
2314
2315         for (i=0; i<msg->num_elements; i++) {
2316                 struct ldb_message_element *el = &msg->elements[i];
2317                 struct ldb_message_element *old_el, *new_el;
2318                 const struct dsdb_attribute *schema_attr
2319                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2320                 if (!schema_attr) {
2321                         ldb_asprintf_errstring(ldb,
2322                                                "%s: attribute %s is not a valid attribute in schema",
2323                                                __FUNCTION__, el->name);
2324                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
2325                 }
2326                 if (schema_attr->linkID == 0) {
2327                         continue;
2328                 }
2329                 if ((schema_attr->linkID & 1) == 1) {
2330                         if (parent && ldb_request_get_control(parent, DSDB_CONTROL_DBCHECK)) {
2331                                 continue;
2332                         }
2333                         /* Odd is for the target.  Illegal to modify */
2334                         ldb_asprintf_errstring(ldb,
2335                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
2336                         return LDB_ERR_UNWILLING_TO_PERFORM;
2337                 }
2338                 old_el = ldb_msg_find_element(old_msg, el->name);
2339                 switch (el->flags & LDB_FLAG_MOD_MASK) {
2340                 case LDB_FLAG_MOD_REPLACE:
2341                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2342                         break;
2343                 case LDB_FLAG_MOD_DELETE:
2344                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2345                         break;
2346                 case LDB_FLAG_MOD_ADD:
2347                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2348                         break;
2349                 default:
2350                         ldb_asprintf_errstring(ldb,
2351                                                "invalid flags 0x%x for %s linked attribute",
2352                                                el->flags, el->name);
2353                         return LDB_ERR_UNWILLING_TO_PERFORM;
2354                 }
2355                 if (dsdb_check_single_valued_link(schema_attr, el) != LDB_SUCCESS) {
2356                         ldb_asprintf_errstring(ldb,
2357                                                "Attribute %s is single valued but more than one value has been supplied",
2358                                                el->name);
2359                         return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
2360                 } else {
2361                         el->flags |= LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK;
2362                 }
2363
2364
2365
2366                 if (ret != LDB_SUCCESS) {
2367                         return ret;
2368                 }
2369                 if (old_el) {
2370                         ldb_msg_remove_attr(old_msg, el->name);
2371                 }
2372                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2373                 new_el->num_values = el->num_values;
2374                 new_el->values = talloc_steal(msg->elements, el->values);
2375
2376                 /* TODO: this relises a bit too heavily on the exact
2377                    behaviour of ldb_msg_find_element and
2378                    ldb_msg_remove_element */
2379                 old_el = ldb_msg_find_element(msg, el->name);
2380                 if (old_el != el) {
2381                         ldb_msg_remove_element(msg, old_el);
2382                         i--;
2383                 }
2384         }
2385
2386         talloc_free(res);
2387         return ret;
2388 }
2389
2390
2391
2392 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2393 {
2394         struct samldb_msds_intid_persistant *msds_intid_struct;
2395         struct ldb_context *ldb;
2396         struct replmd_replicated_request *ac;
2397         struct ldb_request *down_req;
2398         struct ldb_message *msg;
2399         time_t t = time(NULL);
2400         int ret;
2401         bool is_urgent = false, rodc = false;
2402         unsigned int functional_level;
2403         const DATA_BLOB *guid_blob;
2404         struct ldb_control *sd_propagation_control;
2405
2406         /* do not manipulate our control entries */
2407         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2408                 return ldb_next_request(module, req);
2409         }
2410
2411         sd_propagation_control = ldb_request_get_control(req,
2412                                         DSDB_CONTROL_SEC_DESC_PROPAGATION_OID);
2413         if (sd_propagation_control != NULL) {
2414                 if (req->op.mod.message->num_elements != 1) {
2415                         return ldb_module_operr(module);
2416                 }
2417                 ret = strcmp(req->op.mod.message->elements[0].name,
2418                              "nTSecurityDescriptor");
2419                 if (ret != 0) {
2420                         return ldb_module_operr(module);
2421                 }
2422
2423                 return ldb_next_request(module, req);
2424         }
2425
2426         ldb = ldb_module_get_ctx(module);
2427
2428         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2429
2430         guid_blob = ldb_msg_find_ldb_val(req->op.mod.message, "objectGUID");
2431         if ( guid_blob != NULL ) {
2432                 ldb_set_errstring(ldb,
2433                                   "replmd_modify: it's not allowed to change the objectGUID!");
2434                 return LDB_ERR_CONSTRAINT_VIOLATION;
2435         }
2436
2437         ac = replmd_ctx_init(module, req);
2438         if (ac == NULL) {
2439                 return ldb_module_oom(module);
2440         }
2441
2442         functional_level = dsdb_functional_level(ldb);
2443
2444         /* we have to copy the message as the caller might have it as a const */
2445         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2446         if (msg == NULL) {
2447                 ldb_oom(ldb);
2448                 talloc_free(ac);
2449                 return LDB_ERR_OPERATIONS_ERROR;
2450         }
2451
2452         ldb_msg_remove_attr(msg, "whenChanged");
2453         ldb_msg_remove_attr(msg, "uSNChanged");
2454
2455         ret = replmd_update_rpmd(module, ac->schema, req, NULL,
2456                                  msg, &ac->seq_num, t, &is_urgent, &rodc);
2457         if (rodc && (ret == LDB_ERR_REFERRAL)) {
2458                 struct loadparm_context *lp_ctx;
2459                 char *referral;
2460
2461                 lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2462                                          struct loadparm_context);
2463
2464                 referral = talloc_asprintf(req,
2465                                            "ldap://%s/%s",
2466                                            lpcfg_dnsdomain(lp_ctx),
2467                                            ldb_dn_get_linearized(msg->dn));
2468                 ret = ldb_module_send_referral(req, referral);
2469                 talloc_free(ac);
2470                 return ret;
2471         }
2472
2473         if (ret != LDB_SUCCESS) {
2474                 talloc_free(ac);
2475                 return ret;
2476         }
2477
2478         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t, req);
2479         if (ret != LDB_SUCCESS) {
2480                 talloc_free(ac);
2481                 return ret;
2482         }
2483
2484         /* TODO:
2485          * - replace the old object with the newly constructed one
2486          */
2487
2488         ac->is_urgent = is_urgent;
2489
2490         ret = ldb_build_mod_req(&down_req, ldb, ac,
2491                                 msg,
2492                                 req->controls,
2493                                 ac, replmd_op_callback,
2494                                 req);
2495         LDB_REQ_SET_LOCATION(down_req);
2496         if (ret != LDB_SUCCESS) {
2497                 talloc_free(ac);
2498                 return ret;
2499         }
2500
2501         /* current partition control is needed by "replmd_op_callback" */
2502         if (ldb_request_get_control(req, DSDB_CONTROL_CURRENT_PARTITION_OID) == NULL) {
2503                 ret = ldb_request_add_control(down_req,
2504                                               DSDB_CONTROL_CURRENT_PARTITION_OID,
2505                                               false, NULL);
2506                 if (ret != LDB_SUCCESS) {
2507                         talloc_free(ac);
2508                         return ret;
2509                 }
2510         }
2511
2512         /* If we are in functional level 2000, then
2513          * replmd_modify_handle_linked_attribs will have done
2514          * nothing */
2515         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
2516                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
2517                 if (ret != LDB_SUCCESS) {
2518                         talloc_free(ac);
2519                         return ret;
2520                 }
2521         }
2522
2523         talloc_steal(down_req, msg);
2524
2525         /* we only change whenChanged and uSNChanged if the seq_num
2526            has changed */
2527         if (ac->seq_num != 0) {
2528                 ret = add_time_element(msg, "whenChanged", t);
2529                 if (ret != LDB_SUCCESS) {
2530                         talloc_free(ac);
2531                         ldb_operr(ldb);
2532                         return ret;
2533                 }
2534
2535                 ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
2536                 if (ret != LDB_SUCCESS) {
2537                         talloc_free(ac);
2538                         ldb_operr(ldb);
2539                         return ret;
2540                 }
2541         }
2542
2543         if (!ldb_dn_compare_base(ac->schema->base_dn, msg->dn)) {
2544                 /* Update the usn in the SAMLDB_MSDS_INTID_OPAQUE opaque */
2545                 msds_intid_struct = (struct samldb_msds_intid_persistant *) ldb_get_opaque(ldb, SAMLDB_MSDS_INTID_OPAQUE);
2546                 if (msds_intid_struct) {
2547                         msds_intid_struct->usn = ac->seq_num;
2548                 }
2549         }
2550
2551         /* go on with the call chain */
2552         return ldb_next_request(module, down_req);
2553 }
2554
2555 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2556
2557 /*
2558   handle a rename request
2559
2560   On a rename we need to do an extra ldb_modify which sets the
2561   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2562  */
2563 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2564 {
2565         struct ldb_context *ldb;
2566         struct replmd_replicated_request *ac;
2567         int ret;
2568         struct ldb_request *down_req;
2569
2570         /* do not manipulate our control entries */
2571         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2572                 return ldb_next_request(module, req);
2573         }
2574
2575         ldb = ldb_module_get_ctx(module);
2576
2577         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2578
2579         ac = replmd_ctx_init(module, req);
2580         if (ac == NULL) {
2581                 return ldb_module_oom(module);
2582         }
2583
2584         ret = ldb_build_rename_req(&down_req, ldb, ac,
2585                                    ac->req->op.rename.olddn,
2586                                    ac->req->op.rename.newdn,
2587                                    ac->req->controls,
2588                                    ac, replmd_rename_callback,
2589                                    ac->req);
2590         LDB_REQ_SET_LOCATION(down_req);
2591         if (ret != LDB_SUCCESS) {
2592                 talloc_free(ac);
2593                 return ret;
2594         }
2595
2596         /* go on with the call chain */
2597         return ldb_next_request(module, down_req);
2598 }
2599
2600 /* After the rename is compleated, update the whenchanged etc */
2601 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2602 {
2603         struct ldb_context *ldb;
2604         struct replmd_replicated_request *ac;
2605         struct ldb_request *down_req;
2606         struct ldb_message *msg;
2607         const struct dsdb_attribute *rdn_attr;
2608         const char *rdn_name;
2609         const struct ldb_val *rdn_val;
2610         const char *attrs[5] = { NULL, };
2611         time_t t = time(NULL);
2612         int ret;
2613         bool is_urgent = false, rodc = false;
2614
2615         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2616         ldb = ldb_module_get_ctx(ac->module);
2617
2618         if (ares->error != LDB_SUCCESS) {
2619                 return ldb_module_done(ac->req, ares->controls,
2620                                         ares->response, ares->error);
2621         }
2622
2623         if (ares->type != LDB_REPLY_DONE) {
2624                 ldb_set_errstring(ldb,
2625                                   "invalid ldb_reply_type in callback");
2626                 talloc_free(ares);
2627                 return ldb_module_done(ac->req, NULL, NULL,
2628                                         LDB_ERR_OPERATIONS_ERROR);
2629         }
2630
2631         /* TODO:
2632          * - replace the old object with the newly constructed one
2633          */
2634
2635         msg = ldb_msg_new(ac);
2636         if (msg == NULL) {
2637                 ldb_oom(ldb);
2638                 return LDB_ERR_OPERATIONS_ERROR;
2639         }
2640
2641         msg->dn = ac->req->op.rename.newdn;
2642
2643         rdn_name = ldb_dn_get_rdn_name(msg->dn);
2644         if (rdn_name == NULL) {
2645                 talloc_free(ares);
2646                 return ldb_module_done(ac->req, NULL, NULL,
2647                                        ldb_operr(ldb));
2648         }
2649
2650         /* normalize the rdn attribute name */
2651         rdn_attr = dsdb_attribute_by_lDAPDisplayName(ac->schema, rdn_name);
2652         if (rdn_attr == NULL) {
2653                 talloc_free(ares);
2654                 return ldb_module_done(ac->req, NULL, NULL,
2655                                        ldb_operr(ldb));
2656         }
2657         rdn_name = rdn_attr->lDAPDisplayName;
2658
2659         rdn_val = ldb_dn_get_rdn_val(msg->dn);
2660         if (rdn_val == NULL) {
2661                 talloc_free(ares);
2662                 return ldb_module_done(ac->req, NULL, NULL,
2663                                        ldb_operr(ldb));
2664         }
2665
2666         if (ldb_msg_add_empty(msg, rdn_name, LDB_FLAG_MOD_REPLACE, NULL) != 0) {
2667                 talloc_free(ares);
2668                 return ldb_module_done(ac->req, NULL, NULL,
2669                                        ldb_oom(ldb));
2670         }
2671         if (ldb_msg_add_value(msg, rdn_name, rdn_val, NULL) != 0) {
2672                 talloc_free(ares);
2673                 return ldb_module_done(ac->req, NULL, NULL,
2674                                        ldb_oom(ldb));
2675         }
2676         if (ldb_msg_add_empty(msg, "name", LDB_FLAG_MOD_REPLACE, NULL) != 0) {
2677                 talloc_free(ares);
2678                 return ldb_module_done(ac->req, NULL, NULL,
2679                                        ldb_oom(ldb));
2680         }
2681         if (ldb_msg_add_value(msg, "name", rdn_val, NULL) != 0) {
2682                 talloc_free(ares);
2683                 return ldb_module_done(ac->req, NULL, NULL,
2684                                        ldb_oom(ldb));
2685         }
2686
2687         /*
2688          * here we let replmd_update_rpmd() only search for
2689          * the existing "replPropertyMetaData" and rdn_name attributes.
2690          *
2691          * We do not want the existing "name" attribute as
2692          * the "name" attribute needs to get the version
2693          * updated on rename even if the rdn value hasn't changed.
2694          *
2695          * This is the diff of the meta data, for a moved user
2696          * on a w2k8r2 server:
2697          *
2698          * # record 1
2699          * -dn: CN=sdf df,CN=Users,DC=bla,DC=base
2700          * +dn: CN=sdf df,OU=TestOU,DC=bla,DC=base
2701          *  replPropertyMetaData:     NDR: struct replPropertyMetaDataBlob
2702          *         version                  : 0x00000001 (1)
2703          *         reserved                 : 0x00000000 (0)
2704          * @@ -66,11 +66,11 @@ replPropertyMetaData:     NDR: struct re
2705          *                      local_usn                : 0x00000000000037a5 (14245)
2706          *                 array: struct replPropertyMetaData1
2707          *                      attid                    : DRSUAPI_ATTID_name (0x90001)
2708          * -                    version                  : 0x00000001 (1)
2709          * -                    originating_change_time  : Wed Feb  9 17:20:49 2011 CET
2710          * +                    version                  : 0x00000002 (2)
2711          * +                    originating_change_time  : Wed Apr  6 15:21:01 2011 CEST
2712          *                      originating_invocation_id: 0d36ca05-5507-4e62-aca3-354bab0d39e1
2713          * -                    originating_usn          : 0x00000000000037a5 (14245)
2714          * -                    local_usn                : 0x00000000000037a5 (14245)
2715          * +                    originating_usn          : 0x0000000000003834 (14388)
2716          * +                    local_usn                : 0x0000000000003834 (14388)
2717          *                 array: struct replPropertyMetaData1
2718          *                      attid                    : DRSUAPI_ATTID_userAccountControl (0x90008)
2719          *                      version                  : 0x00000004 (4)
2720          */
2721         attrs[0] = "replPropertyMetaData";
2722         attrs[1] = "objectClass";
2723         attrs[2] = "instanceType";
2724         attrs[3] = rdn_name;
2725         attrs[4] = NULL;
2726
2727         ret = replmd_update_rpmd(ac->module, ac->schema, req, attrs,
2728                                  msg, &ac->seq_num, t, &is_urgent, &rodc);
2729         if (rodc && (ret == LDB_ERR_REFERRAL)) {
2730                 struct ldb_dn *olddn = ac->req->op.rename.olddn;
2731                 struct loadparm_context *lp_ctx;
2732                 char *referral;
2733
2734                 lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2735                                          struct loadparm_context);
2736
2737                 referral = talloc_asprintf(req,
2738                                            "ldap://%s/%s",
2739                                            lpcfg_dnsdomain(lp_ctx),
2740                                            ldb_dn_get_linearized(olddn));
2741                 ret = ldb_module_send_referral(req, referral);
2742                 talloc_free(ares);
2743                 return ldb_module_done(req, NULL, NULL, ret);
2744         }
2745
2746         if (ret != LDB_SUCCESS) {
2747                 talloc_free(ares);
2748                 return ldb_module_done(ac->req, NULL, NULL, ret);
2749         }
2750
2751         if (ac->seq_num == 0) {
2752                 talloc_free(ares);
2753                 return ldb_module_done(ac->req, NULL, NULL,
2754                                        ldb_error(ldb, ret,
2755                                         "internal error seq_num == 0"));
2756         }
2757         ac->is_urgent = is_urgent;
2758
2759         ret = ldb_build_mod_req(&down_req, ldb, ac,
2760                                 msg,
2761                                 req->controls,
2762                                 ac, replmd_op_callback,
2763                                 req);
2764         LDB_REQ_SET_LOCATION(down_req);
2765         if (ret != LDB_SUCCESS) {
2766                 talloc_free(ac);
2767                 return ret;
2768         }
2769
2770         /* current partition control is needed by "replmd_op_callback" */
2771         if (ldb_request_get_control(req, DSDB_CONTROL_CURRENT_PARTITION_OID) == NULL) {
2772                 ret = ldb_request_add_control(down_req,
2773                                               DSDB_CONTROL_CURRENT_PARTITION_OID,
2774                                               false, NULL);
2775                 if (ret != LDB_SUCCESS) {
2776                         talloc_free(ac);
2777                         return ret;
2778                 }
2779         }
2780
2781         talloc_steal(down_req, msg);
2782
2783         ret = add_time_element(msg, "whenChanged", t);
2784         if (ret != LDB_SUCCESS) {
2785                 talloc_free(ac);
2786                 ldb_operr(ldb);
2787                 return ret;
2788         }
2789
2790         ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
2791         if (ret != LDB_SUCCESS) {
2792                 talloc_free(ac);
2793                 ldb_operr(ldb);
2794                 return ret;
2795         }
2796
2797         /* go on with the call chain - do the modify after the rename */
2798         return ldb_next_request(ac->module, down_req);
2799 }
2800
2801 /*
2802  * remove links from objects that point at this object when an object
2803  * is deleted.  We remove it from the NEXT module per MS-DRSR 5.160
2804  * RemoveObj which states that link removal due to the object being
2805  * deleted is NOT an originating update - they just go away!
2806  *
2807  */
2808 static int replmd_delete_remove_link(struct ldb_module *module,
2809                                      const struct dsdb_schema *schema,
2810                                      struct ldb_dn *dn,
2811                                      struct ldb_message_element *el,
2812                                      const struct dsdb_attribute *sa,
2813                                      struct ldb_request *parent)
2814 {
2815         unsigned int i;
2816         TALLOC_CTX *tmp_ctx = talloc_new(module);
2817         struct ldb_context *ldb = ldb_module_get_ctx(module);
2818
2819         for (i=0; i<el->num_values; i++) {
2820                 struct dsdb_dn *dsdb_dn;
2821                 NTSTATUS status;
2822                 int ret;
2823                 struct GUID guid2;
2824                 struct ldb_message *msg;
2825                 const struct dsdb_attribute *target_attr;
2826                 struct ldb_message_element *el2;
2827                 struct ldb_val dn_val;
2828
2829                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2830                         continue;
2831                 }
2832
2833                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2834                 if (!dsdb_dn) {
2835                         talloc_free(tmp_ctx);
2836                         return LDB_ERR_OPERATIONS_ERROR;
2837                 }
2838
2839                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2840                 if (!NT_STATUS_IS_OK(status)) {
2841                         talloc_free(tmp_ctx);
2842                         return LDB_ERR_OPERATIONS_ERROR;
2843                 }
2844
2845                 /* remove the link */
2846                 msg = ldb_msg_new(tmp_ctx);
2847                 if (!msg) {
2848                         ldb_module_oom(module);
2849                         talloc_free(tmp_ctx);
2850                         return LDB_ERR_OPERATIONS_ERROR;
2851                 }
2852
2853
2854                 msg->dn = dsdb_dn->dn;
2855
2856                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2857                 if (target_attr == NULL) {
2858                         continue;
2859                 }
2860
2861                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2862                 if (ret != LDB_SUCCESS) {
2863                         ldb_module_oom(module);
2864                         talloc_free(tmp_ctx);
2865                         return LDB_ERR_OPERATIONS_ERROR;
2866                 }
2867                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2868                 el2->values = &dn_val;
2869                 el2->num_values = 1;
2870
2871                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE, parent);
2872                 if (ret != LDB_SUCCESS) {
2873                         talloc_free(tmp_ctx);
2874                         return ret;
2875                 }
2876         }
2877         talloc_free(tmp_ctx);
2878         return LDB_SUCCESS;
2879 }
2880
2881
2882 /*
2883   handle update of replication meta data for deletion of objects
2884
2885   This also handles the mapping of delete to a rename operation
2886   to allow deletes to be replicated.
2887
2888   It also handles the incoming deleted objects, to ensure they are
2889   fully deleted here.  In that case re_delete is true, and we do not
2890   use this as a signal to change the deleted state, just reinforce it.
2891
2892  */
2893 static int replmd_delete_internals(struct ldb_module *module, struct ldb_request *req, bool re_delete)
2894 {
2895         int ret = LDB_ERR_OTHER;
2896         bool retb, disallow_move_on_delete;
2897         struct ldb_dn *old_dn, *new_dn;
2898         const char *rdn_name;
2899         const struct ldb_val *rdn_value, *new_rdn_value;
2900         struct GUID guid;
2901         struct ldb_context *ldb = ldb_module_get_ctx(module);
2902         const struct dsdb_schema *schema;
2903         struct ldb_message *msg, *old_msg;
2904         struct ldb_message_element *el;
2905         TALLOC_CTX *tmp_ctx;
2906         struct ldb_result *res, *parent_res;
2907         const char *preserved_attrs[] = {
2908                 /* yes, this really is a hard coded list. See MS-ADTS
2909                    section 3.1.1.5.5.1.1 */
2910                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2911                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2912                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2913                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2914                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2915                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2916                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2917                 "whenChanged", NULL};
2918         unsigned int i, el_count = 0;
2919         enum deletion_state deletion_state, next_deletion_state;
2920
2921         if (ldb_dn_is_special(req->op.del.dn)) {
2922                 return ldb_next_request(module, req);
2923         }
2924
2925         tmp_ctx = talloc_new(ldb);
2926         if (!tmp_ctx) {
2927                 ldb_oom(ldb);
2928                 return LDB_ERR_OPERATIONS_ERROR;
2929         }
2930
2931         schema = dsdb_get_schema(ldb, tmp_ctx);
2932         if (!schema) {
2933                 talloc_free(tmp_ctx);
2934                 return LDB_ERR_OPERATIONS_ERROR;
2935         }
2936
2937         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2938
2939         /* we need the complete msg off disk, so we can work out which
2940            attributes need to be removed */
2941         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2942                                     DSDB_FLAG_NEXT_MODULE |
2943                                     DSDB_SEARCH_SHOW_RECYCLED |
2944                                     DSDB_SEARCH_REVEAL_INTERNALS |
2945                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT, req);
2946         if (ret != LDB_SUCCESS) {
2947                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
2948                                        "repmd_delete: Failed to %s %s, because we failed to find it: %s",
2949                                        re_delete ? "re-delete" : "delete",
2950                                        ldb_dn_get_linearized(old_dn),
2951                                        ldb_errstring(ldb_module_get_ctx(module)));
2952                 talloc_free(tmp_ctx);
2953                 return ret;
2954         }
2955         old_msg = res->msgs[0];
2956
2957         replmd_deletion_state(module, old_msg,
2958                               &deletion_state,
2959                               &next_deletion_state);
2960
2961         /* This supports us noticing an incoming isDeleted and acting on it */
2962         if (re_delete) {
2963                 SMB_ASSERT(deletion_state > OBJECT_NOT_DELETED);
2964                 next_deletion_state = deletion_state;
2965         }
2966
2967         if (next_deletion_state == OBJECT_REMOVED) {
2968                 struct auth_session_info *session_info =
2969                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2970                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2971                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2972                                         ldb_dn_get_linearized(old_msg->dn));
2973                         return LDB_ERR_UNWILLING_TO_PERFORM;
2974                 }
2975
2976                 /* it is already deleted - really remove it this time */
2977                 talloc_free(tmp_ctx);
2978                 return ldb_next_request(module, req);
2979         }
2980
2981         rdn_name = ldb_dn_get_rdn_name(old_dn);
2982         rdn_value = ldb_dn_get_rdn_val(old_dn);
2983         if ((rdn_name == NULL) || (rdn_value == NULL)) {
2984                 talloc_free(tmp_ctx);
2985                 return ldb_operr(ldb);
2986         }
2987
2988         msg = ldb_msg_new(tmp_ctx);
2989         if (msg == NULL) {
2990                 ldb_module_oom(module);
2991                 talloc_free(tmp_ctx);
2992                 return LDB_ERR_OPERATIONS_ERROR;
2993         }
2994
2995         msg->dn = old_dn;
2996
2997         /* consider the SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE flag */
2998         disallow_move_on_delete =
2999                 (ldb_msg_find_attr_as_int(old_msg, "systemFlags", 0)
3000                  & SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE);
3001
3002         /* work out where we will be renaming this object to */
3003         if (!disallow_move_on_delete) {
3004                 ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn,
3005                                                   &new_dn);
3006                 /*
3007                  * Deleted Objects itself appears to be deleted, but
3008                  * should also not be moved, and we should not move
3009                  * objects if we can't find the deleted objects DN
3010                  */
3011                 if (re_delete && (ret != LDB_SUCCESS || ldb_dn_compare(old_dn, new_dn) == 0)) {
3012                         new_dn = ldb_dn_get_parent(tmp_ctx, old_dn);
3013                         if (new_dn == NULL) {
3014                                 ldb_module_oom(module);
3015                                 talloc_free(tmp_ctx);
3016                                 return LDB_ERR_OPERATIONS_ERROR;
3017                         }
3018                 } else if (ret != LDB_SUCCESS) {
3019                         /* this is probably an attempted delete on a partition
3020                          * that doesn't allow delete operations, such as the
3021                          * schema partition */
3022                         ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
3023                                                ldb_dn_get_linearized(old_dn));
3024                         talloc_free(tmp_ctx);
3025                         return LDB_ERR_UNWILLING_TO_PERFORM;
3026                 }
3027         } else {
3028                 new_dn = ldb_dn_get_parent(tmp_ctx, old_dn);
3029                 if (new_dn == NULL) {
3030                         ldb_module_oom(module);
3031                         talloc_free(tmp_ctx);
3032                         return LDB_ERR_OPERATIONS_ERROR;
3033                 }
3034         }
3035
3036         if (deletion_state == OBJECT_NOT_DELETED) {
3037                 /* get the objects GUID from the search we just did */
3038                 guid = samdb_result_guid(old_msg, "objectGUID");
3039
3040                 /* Add a formatted child */
3041                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
3042                                             rdn_name,
3043                                             ldb_dn_escape_value(tmp_ctx, *rdn_value),
3044                                             GUID_string(tmp_ctx, &guid));
3045                 if (!retb) {
3046                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
3047                                  ldb_dn_get_linearized(new_dn)));
3048                         talloc_free(tmp_ctx);
3049                         return LDB_ERR_OPERATIONS_ERROR;
3050                 }
3051
3052                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
3053                 if (ret != LDB_SUCCESS) {
3054                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
3055                         ldb_module_oom(module);
3056                         talloc_free(tmp_ctx);
3057                         return ret;
3058                 }
3059                 msg->elements[el_count++].flags = LDB_FLAG_MOD_REPLACE;
3060         } else {
3061                 /*
3062                  * No matter what has happened with other renames etc, try again to
3063                  * get this to be under the deleted DN. See MS-DRSR 5.160 RemoveObj
3064                  */
3065
3066                 struct ldb_dn *rdn = ldb_dn_copy(tmp_ctx, old_dn);
3067                 retb = ldb_dn_remove_base_components(rdn, ldb_dn_get_comp_num(rdn) - 1);
3068                 if (!retb) {
3069                         DEBUG(0,(__location__ ": Unable to add a prepare rdn of %s",
3070                                  ldb_dn_get_linearized(rdn)));
3071                         talloc_free(tmp_ctx);
3072                         return LDB_ERR_OPERATIONS_ERROR;
3073                 }
3074                 SMB_ASSERT(ldb_dn_get_comp_num(rdn) == 1);
3075
3076                 retb = ldb_dn_add_child(new_dn, rdn);
3077                 if (!retb) {
3078                         DEBUG(0,(__location__ ": Unable to add rdn %s to base dn: %s",
3079                                  ldb_dn_get_linearized(rdn),
3080                                  ldb_dn_get_linearized(new_dn)));
3081                         talloc_free(tmp_ctx);
3082                         return LDB_ERR_OPERATIONS_ERROR;
3083                 }
3084         }
3085
3086         /*
3087           now we need to modify the object in the following ways:
3088
3089           - add isDeleted=TRUE
3090           - update rDN and name, with new rDN
3091           - remove linked attributes
3092           - remove objectCategory and sAMAccountType
3093           - remove attribs not on the preserved list
3094              - preserved if in above list, or is rDN
3095           - remove all linked attribs from this object
3096           - remove all links from other objects to this object
3097           - add lastKnownParent
3098           - update replPropertyMetaData?
3099
3100           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
3101          */
3102
3103         if (deletion_state == OBJECT_NOT_DELETED) {
3104                 /* we need the storage form of the parent GUID */
3105                 ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
3106                                             ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
3107                                             DSDB_FLAG_NEXT_MODULE |
3108                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3109                                             DSDB_SEARCH_REVEAL_INTERNALS|
3110                                             DSDB_SEARCH_SHOW_RECYCLED, req);
3111                 if (ret != LDB_SUCCESS) {
3112                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
3113                                                "repmd_delete: Failed to %s %s, because we failed to find it's parent (%s): %s",
3114                                                re_delete ? "re-delete" : "delete",
3115                                                ldb_dn_get_linearized(old_dn),
3116                                                ldb_dn_get_linearized(ldb_dn_get_parent(tmp_ctx, old_dn)),
3117                                                ldb_errstring(ldb_module_get_ctx(module)));
3118                         talloc_free(tmp_ctx);
3119                         return ret;
3120                 }
3121
3122                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
3123                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
3124                 if (ret != LDB_SUCCESS) {
3125                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
3126                         ldb_module_oom(module);
3127                         talloc_free(tmp_ctx);
3128                         return ret;
3129                 }
3130                 msg->elements[el_count++].flags = LDB_FLAG_MOD_REPLACE;
3131
3132                 if (next_deletion_state == OBJECT_DELETED) {
3133                         ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
3134                         if (ret != LDB_SUCCESS) {
3135                                 DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
3136                                 ldb_module_oom(module);
3137                                 talloc_free(tmp_ctx);
3138                                 return ret;
3139                         }
3140                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
3141                 }
3142         }
3143
3144         switch (next_deletion_state) {
3145
3146         case OBJECT_RECYCLED:
3147         case OBJECT_TOMBSTONE:
3148
3149                 /*
3150                  * MS-ADTS 3.1.1.5.5.1.1 Tombstone Requirements
3151                  * describes what must be removed from a tombstone
3152                  * object
3153                  *
3154                  * MS-ADTS 3.1.1.5.5.1.3 Recycled-Object Requirements
3155                  * describes what must be removed from a recycled
3156                  * object
3157                  *
3158                  */
3159
3160                 /*
3161                  * we also mark it as recycled, meaning this object can't be
3162                  * recovered (we are stripping its attributes).
3163                  * This is done only if we have this schema object of course ...
3164                  * This behavior is identical to the one of Windows 2008R2 which
3165                  * always set the isRecycled attribute, even if the recycle-bin is
3166                  * not activated and what ever the forest level is.
3167                  */
3168                 if (dsdb_attribute_by_lDAPDisplayName(schema, "isRecycled") != NULL) {
3169                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
3170                         if (ret != LDB_SUCCESS) {
3171                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
3172                                 ldb_module_oom(module);
3173                                 talloc_free(tmp_ctx);
3174                                 return ret;
3175                         }
3176                         msg->elements[el_count++].flags = LDB_FLAG_MOD_REPLACE;
3177                 }
3178
3179                 /* work out which of the old attributes we will be removing */
3180                 for (i=0; i<old_msg->num_elements; i++) {
3181                         const struct dsdb_attribute *sa;
3182                         el = &old_msg->elements[i];
3183                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
3184                         if (!sa) {
3185                                 talloc_free(tmp_ctx);
3186                                 return LDB_ERR_OPERATIONS_ERROR;
3187                         }
3188                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
3189                                 /* don't remove the rDN */
3190                                 continue;
3191                         }
3192                         if (sa->linkID && (sa->linkID & 1)) {
3193                                 /*
3194                                   we have a backlink in this object
3195                                   that needs to be removed. We're not
3196                                   allowed to remove it directly
3197                                   however, so we instead setup a
3198                                   modify to delete the corresponding
3199                                   forward link
3200                                  */
3201                                 ret = replmd_delete_remove_link(module, schema, old_dn, el, sa, req);
3202                                 if (ret != LDB_SUCCESS) {
3203                                         talloc_free(tmp_ctx);
3204                                         return LDB_ERR_OPERATIONS_ERROR;
3205                                 }
3206                                 /* now we continue, which means we
3207                                    won't remove this backlink
3208                                    directly
3209                                 */
3210                                 continue;
3211                         }
3212                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
3213                                 continue;
3214                         }
3215                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
3216                         if (ret != LDB_SUCCESS) {
3217                                 talloc_free(tmp_ctx);
3218                                 ldb_module_oom(module);
3219                                 return ret;
3220                         }
3221                 }
3222
3223                 /* Duplicate with the below - we remove the
3224                  * samAccountType as an originating update, in case it
3225                  * somehow came back.  The objectCategory will have
3226                  * gone in the above */
3227                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_REPLACE, NULL);
3228                 if (ret != LDB_SUCCESS) {
3229                         talloc_free(tmp_ctx);
3230                         ldb_module_oom(module);
3231                         return ret;
3232                 }
3233
3234                 break;
3235
3236         case OBJECT_DELETED:
3237                 /*
3238                  * MS-ADTS 3.1.1.5.5.1.2 Deleted-Object Requirements
3239                  * describes what must be removed from a deleted
3240                  * object
3241                  */
3242
3243                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_REPLACE, NULL);
3244                 if (ret != LDB_SUCCESS) {
3245                         talloc_free(tmp_ctx);
3246                         ldb_module_oom(module);
3247                         return ret;
3248                 }
3249
3250                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_REPLACE, NULL);
3251                 if (ret != LDB_SUCCESS) {
3252                         talloc_free(tmp_ctx);
3253                         ldb_module_oom(module);
3254                         return ret;
3255                 }
3256
3257                 break;
3258
3259         default:
3260                 break;
3261         }
3262
3263         if (deletion_state == OBJECT_NOT_DELETED) {
3264                 const struct dsdb_attribute *sa;
3265
3266                 /* work out what the new rdn value is, for updating the
3267                    rDN and name fields */
3268                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
3269                 if (new_rdn_value == NULL) {
3270                         talloc_free(tmp_ctx);
3271                         return ldb_operr(ldb);
3272                 }
3273
3274                 sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
3275                 if (!sa) {
3276                         talloc_free(tmp_ctx);
3277                         return LDB_ERR_OPERATIONS_ERROR;
3278                 }
3279
3280                 ret = ldb_msg_add_value(msg, sa->lDAPDisplayName, new_rdn_value,
3281                                         &el);
3282                 if (ret != LDB_SUCCESS) {
3283                         talloc_free(tmp_ctx);
3284                         return ret;
3285                 }
3286                 el->flags = LDB_FLAG_MOD_REPLACE;
3287
3288                 el = ldb_msg_find_element(old_msg, "name");
3289                 if (el) {
3290                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
3291                         if (ret != LDB_SUCCESS) {
3292                                 talloc_free(tmp_ctx);
3293                                 return ret;
3294                         }
3295                         el->flags = LDB_FLAG_MOD_REPLACE;
3296                 }
3297         }
3298
3299         /*
3300          * TODO: Per MS-DRSR 5.160 RemoveObj we should remove links directly, not as an originating update!
3301          *
3302          */
3303
3304         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE, req);
3305         if (ret != LDB_SUCCESS) {
3306                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
3307                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
3308                 talloc_free(tmp_ctx);
3309                 return ret;
3310         }
3311
3312         /*
3313          * No matter what has happned with other renames, try again to
3314          * get this to be under the deleted DN.
3315          */
3316         if (strcmp(ldb_dn_get_linearized(old_dn), ldb_dn_get_linearized(new_dn)) != 0) {
3317                 /* now rename onto the new DN */
3318                 ret = dsdb_module_rename(module, old_dn, new_dn, DSDB_FLAG_NEXT_MODULE, req);
3319                 if (ret != LDB_SUCCESS){
3320                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
3321                                  ldb_dn_get_linearized(old_dn),
3322                                  ldb_dn_get_linearized(new_dn),
3323                                  ldb_errstring(ldb)));
3324                         talloc_free(tmp_ctx);
3325                         return ret;
3326                 }
3327         }
3328
3329         talloc_free(tmp_ctx);
3330
3331         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
3332 }
3333
3334 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
3335 {
3336         return replmd_delete_internals(module, req, false);
3337 }
3338
3339
3340 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
3341 {
3342         return ret;
3343 }
3344
3345 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
3346 {
3347         int ret = LDB_ERR_OTHER;
3348         /* TODO: do some error mapping */
3349         return ret;
3350 }
3351
3352
3353 static struct replPropertyMetaData1 *
3354 replmd_replPropertyMetaData1_find_attid(struct replPropertyMetaDataBlob *md_blob,
3355                                         enum drsuapi_DsAttributeId attid)
3356 {
3357         uint32_t i;
3358         struct replPropertyMetaDataCtr1 *rpmd_ctr = &md_blob->ctr.ctr1;
3359
3360         for (i = 0; i < rpmd_ctr->count; i++) {
3361                 if (rpmd_ctr->array[i].attid == attid) {
3362                         return &rpmd_ctr->array[i];
3363                 }
3364         }
3365         return NULL;
3366 }
3367
3368
3369 /*
3370    return true if an update is newer than an existing entry
3371    see section 5.11 of MS-ADTS
3372 */
3373 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
3374                                    const struct GUID *update_invocation_id,
3375                                    uint32_t current_version,
3376                                    uint32_t update_version,
3377                                    NTTIME current_change_time,
3378                                    NTTIME update_change_time)
3379 {
3380         if (update_version != current_version) {
3381                 return update_version > current_version;
3382         }
3383         if (update_change_time != current_change_time) {
3384                 return update_change_time > current_change_time;
3385         }
3386         return GUID_compare(update_invocation_id, current_invocation_id) > 0;
3387 }
3388
3389 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
3390                                                   struct replPropertyMetaData1 *new_m)
3391 {
3392         return replmd_update_is_newer(&cur_m->originating_invocation_id,
3393                                       &new_m->originating_invocation_id,
3394                                       cur_m->version,
3395                                       new_m->version,
3396                                       cur_m->originating_change_time,
3397                                       new_m->originating_change_time);
3398 }
3399
3400
3401 /*
3402   form a conflict DN
3403  */
3404 static struct ldb_dn *replmd_conflict_dn(TALLOC_CTX *mem_ctx, struct ldb_dn *dn, struct GUID *guid)
3405 {
3406         const struct ldb_val *rdn_val;
3407         const char *rdn_name;
3408         struct ldb_dn *new_dn;
3409
3410         rdn_val = ldb_dn_get_rdn_val(dn);
3411         rdn_name = ldb_dn_get_rdn_name(dn);
3412         if (!rdn_val || !rdn_name) {
3413                 return NULL;
3414         }
3415
3416         new_dn = ldb_dn_copy(mem_ctx, dn);
3417         if (!new_dn) {
3418                 return NULL;
3419         }
3420
3421         if (!ldb_dn_remove_child_components(new_dn, 1)) {
3422                 return NULL;
3423         }
3424
3425         if (!ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ACNF:%s",
3426                                   rdn_name,
3427                                   ldb_dn_escape_value(new_dn, *rdn_val),
3428                                   GUID_string(new_dn, guid))) {
3429                 return NULL;
3430         }
3431
3432         return new_dn;
3433 }
3434
3435
3436 /*
3437   perform a modify operation which sets the rDN and name attributes to
3438   their current values. This has the effect of changing these
3439   attributes to have been last updated by the current DC. This is
3440   needed to ensure that renames performed as part of conflict
3441   resolution are propogated to other DCs
3442  */
3443 static int replmd_name_modify(struct replmd_replicated_request *ar,
3444                               struct ldb_request *req, struct ldb_dn *dn)
3445 {
3446         struct ldb_message *msg;
3447         const char *rdn_name;
3448         const struct ldb_val *rdn_val;
3449         const struct dsdb_attribute *rdn_attr;
3450         int ret;
3451
3452         msg = ldb_msg_new(req);
3453         if (msg == NULL) {
3454                 goto failed;
3455         }
3456         msg->dn = dn;
3457
3458         rdn_name = ldb_dn_get_rdn_name(dn);
3459         if (rdn_name == NULL) {
3460                 goto failed;
3461         }
3462
3463         /* normalize the rdn attribute name */
3464         rdn_attr = dsdb_attribute_by_lDAPDisplayName(ar->schema, rdn_name);
3465         if (rdn_attr == NULL) {
3466                 goto failed;
3467         }
3468         rdn_name = rdn_attr->lDAPDisplayName;
3469
3470         rdn_val = ldb_dn_get_rdn_val(dn);
3471         if (rdn_val == NULL) {
3472                 goto failed;
3473         }
3474
3475         if (ldb_msg_add_empty(msg, rdn_name, LDB_FLAG_MOD_REPLACE, NULL) != 0) {
3476                 goto failed;
3477         }
3478         if (ldb_msg_add_value(msg, rdn_name, rdn_val, NULL) != 0) {
3479                 goto failed;
3480         }
3481         if (ldb_msg_add_empty(msg, "name", LDB_FLAG_MOD_REPLACE, NULL) != 0) {
3482                 goto failed;
3483         }
3484         if (ldb_msg_add_value(msg, "name", rdn_val, NULL) != 0) {
3485                 goto failed;
3486         }
3487
3488         ret = dsdb_module_modify(ar->module, msg, DSDB_FLAG_OWN_MODULE, req);
3489         if (ret != LDB_SUCCESS) {
3490                 DEBUG(0,(__location__ ": Failed to modify rDN/name of conflict DN '%s' - %s",
3491                          ldb_dn_get_linearized(dn),
3492                          ldb_errstring(ldb_module_get_ctx(ar->module))));
3493                 return ret;
3494         }
3495
3496         talloc_free(msg);
3497
3498         return LDB_SUCCESS;
3499
3500 failed:
3501         talloc_free(msg);
3502         DEBUG(0,(__location__ ": Failed to setup modify rDN/name of conflict DN '%s'",
3503                  ldb_dn_get_linearized(dn)));
3504         return LDB_ERR_OPERATIONS_ERROR;
3505 }
3506
3507
3508 /*
3509   callback for conflict DN handling where we have renamed the incoming
3510   record. After renaming it, we need to ensure the change of name and
3511   rDN for the incoming record is seen as an originating update by this DC.
3512
3513   This also handles updating lastKnownParent for entries sent to lostAndFound
3514  */
3515 static int replmd_op_name_modify_callback(struct ldb_request *req, struct ldb_reply *ares)
3516 {
3517         struct replmd_replicated_request *ar =
3518                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
3519         struct ldb_dn *conflict_dn;
3520         int ret;
3521
3522         if (ares->error != LDB_SUCCESS) {
3523                 /* call the normal callback for everything except success */
3524                 return replmd_op_callback(req, ares);
3525         }
3526
3527         switch (req->operation) {
3528         case LDB_ADD:
3529                 conflict_dn = req->op.add.message->dn;
3530                 break;
3531         case LDB_MODIFY:
3532                 conflict_dn = req->op.mod.message->dn;
3533                 break;
3534         default:
3535                 smb_panic("replmd_op_name_modify_callback called in unknown circumstances");
3536         }
3537
3538         /* perform a modify of the rDN and name of the record */
3539         ret = replmd_name_modify(ar, req, conflict_dn);
3540         if (ret != LDB_SUCCESS) {
3541                 ares->error = ret;
3542                 return replmd_op_callback(req, ares);
3543         }
3544
3545         if (ar->objs->objects[ar->index_current].last_known_parent) {
3546                 struct ldb_message *msg = ldb_msg_new(req);
3547                 if (msg == NULL) {
3548                         ldb_module_oom(ar->module);
3549                         return LDB_ERR_OPERATIONS_ERROR;
3550                 }
3551
3552                 msg->dn = req->op.add.message->dn;
3553
3554                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
3555                                                ldb_dn_get_extended_linearized(msg, ar->objs->objects[ar->index_current].last_known_parent, 1));
3556                 if (ret != LDB_SUCCESS) {
3557                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
3558                         ldb_module_oom(ar->module);
3559                         return ret;
3560                 }
3561                 msg->elements[0].flags = LDB_FLAG_MOD_REPLACE;
3562
3563                 ret = dsdb_module_modify(ar->module, msg, DSDB_FLAG_OWN_MODULE, req);
3564                 if (ret != LDB_SUCCESS) {
3565                         DEBUG(0,(__location__ ": Failed to modify lastKnownParent of lostAndFound DN '%s' - %s",
3566                                  ldb_dn_get_linearized(msg->dn),
3567                                  ldb_errstring(ldb_module_get_ctx(ar->module))));
3568                         return ret;
3569                 }
3570                 TALLOC_FREE(msg);
3571         }
3572
3573         return replmd_op_callback(req, ares);
3574 }
3575
3576 /*
3577   callback for replmd_replicated_apply_add() and replmd_replicated_handle_rename()
3578   This copes with the creation of conflict records in the case where
3579   the DN exists, but with a different objectGUID
3580  */
3581 static int replmd_op_possible_conflict_callback(struct ldb_request *req, struct ldb_reply *ares, int (*callback)(struct ldb_request *req, struct ldb_reply *ares))
3582 {
3583         struct ldb_dn *conflict_dn;
3584         struct replmd_replicated_request *ar =
3585                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
3586         struct ldb_result *res;
3587         const char *attrs[] = { "replPropertyMetaData", "objectGUID", NULL };
3588         int ret;
3589         const struct ldb_val *omd_value;
3590         struct replPropertyMetaDataBlob omd, *rmd;
3591         enum ndr_err_code ndr_err;
3592         bool rename_incoming_record, rodc;
3593         struct replPropertyMetaData1 *rmd_name, *omd_name;
3594         struct ldb_message *msg;
3595
3596         req->callback = callback;
3597
3598         if (ares->error != LDB_ERR_ENTRY_ALREADY_EXISTS) {
3599                 /* call the normal callback for everything except
3600                    conflicts */
3601                 return ldb_module_done(req, ares->controls, ares->response, ares->error);
3602         }
3603
3604         ret = samdb_rodc(ldb_module_get_ctx(ar->module), &rodc);
3605         if (ret != LDB_SUCCESS) {
3606                 ldb_asprintf_errstring(ldb_module_get_ctx(ar->module), "Failed to determine if we are an RODC when attempting to form conflict DN: %s", ldb_errstring(ldb_module_get_ctx(ar->module)));
3607                 return ldb_module_done(req, ares->controls, ares->response, LDB_ERR_OPERATIONS_ERROR);
3608         }
3609         /*
3610          * we have a conflict, and need to decide if we will keep the
3611          * new record or the old record
3612          */
3613
3614         msg = ar->objs->objects[ar->index_current].msg;
3615
3616         switch (req->operation) {
3617         case LDB_ADD:
3618                 conflict_dn = msg->dn;
3619                 break;
3620         case LDB_RENAME:
3621                 conflict_dn = req->op.rename.newdn;
3622                 break;
3623         default:
3624                 return ldb_module_done(req, ares->controls, ares->response, ldb_module_operr(ar->module));
3625         }
3626
3627         if (rodc) {
3628                 /*
3629                  * We are on an RODC, or were a GC for this
3630                  * partition, so we have to fail this until
3631                  * someone who owns the partition sorts it
3632                  * out
3633                  */
3634                 ldb_asprintf_errstring(ldb_module_get_ctx(ar->module),
3635                                        "Conflict adding object '%s' from incoming replication as we are read only for the partition.  \n"
3636                                        " - We must fail the operation until a master for this partition resolves the conflict",
3637                                        ldb_dn_get_linearized(conflict_dn));
3638                 goto failed;
3639         }
3640
3641         /*
3642          * first we need the replPropertyMetaData attribute from the
3643          * old record
3644          */
3645         ret = dsdb_module_search_dn(ar->module, req, &res, conflict_dn,
3646                                     attrs,
3647                                     DSDB_FLAG_NEXT_MODULE |
3648                                     DSDB_SEARCH_SHOW_DELETED |
3649                                     DSDB_SEARCH_SHOW_RECYCLED, req);
3650         if (ret != LDB_SUCCESS) {
3651                 DEBUG(0,(__location__ ": Unable to find object for conflicting record '%s'\n",
3652                          ldb_dn_get_linearized(conflict_dn)));
3653                 goto failed;
3654         }
3655
3656         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
3657         if (omd_value == NULL) {
3658                 DEBUG(0,(__location__ ": Unable to find replPropertyMetaData for conflicting record '%s'\n",
3659                          ldb_dn_get_linearized(conflict_dn)));
3660                 goto failed;
3661         }
3662
3663         ndr_err = ndr_pull_struct_blob(omd_value, res->msgs[0], &omd,
3664                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
3665         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3666                 DEBUG(0,(__location__ ": Failed to parse old replPropertyMetaData for %s\n",
3667                          ldb_dn_get_linearized(conflict_dn)));
3668                 goto failed;
3669         }
3670
3671         rmd = ar->objs->objects[ar->index_current].meta_data;
3672
3673         /* we decide which is newer based on the RPMD on the name
3674            attribute.  See [MS-DRSR] ResolveNameConflict */
3675         rmd_name = replmd_replPropertyMetaData1_find_attid(rmd, DRSUAPI_ATTID_name);
3676         omd_name = replmd_replPropertyMetaData1_find_attid(&omd, DRSUAPI_ATTID_name);
3677         if (!rmd_name || !omd_name) {
3678                 DEBUG(0,(__location__ ": Failed to find name attribute in replPropertyMetaData for %s\n",
3679                          ldb_dn_get_linearized(conflict_dn)));
3680                 goto failed;
3681         }
3682
3683         rename_incoming_record = !(ar->objs->dsdb_repl_flags & DSDB_REPL_FLAG_PRIORITISE_INCOMING) &&
3684                 !replmd_replPropertyMetaData1_is_newer(omd_name, rmd_name);
3685
3686         if (rename_incoming_record) {
3687                 struct GUID guid;
3688                 struct ldb_dn *new_dn;
3689
3690                 /*
3691                  * We want to run the original callback here, which
3692                  * will return LDB_ERR_ENTRY_ALREADY_EXISTS to the
3693                  * caller, which will in turn know to rename the
3694                  * incoming record.  The error string is set in case
3695                  * this isn't handled properly at some point in the
3696                  * future.
3697                  */
3698                 if (req->operation == LDB_RENAME) {
3699                         ldb_asprintf_errstring(ldb_module_get_ctx(ar->module),
3700                                                "Unable to handle incoming renames where this would "
3701                                                "create a conflict. Incoming record is %s (caller to handle)\n",
3702                                                ldb_dn_get_extended_linearized(req, conflict_dn, 1));
3703
3704                         goto failed;
3705                 }
3706
3707                 guid = samdb_result_guid(msg, "objectGUID");
3708                 if (GUID_all_zero(&guid)) {
3709                         DEBUG(0,(__location__ ": Failed to find objectGUID for conflicting incoming record %s\n",
3710                                  ldb_dn_get_linearized(conflict_dn)));
3711                         goto failed;
3712                 }
3713                 new_dn = replmd_conflict_dn(req, conflict_dn, &guid);
3714                 if (new_dn == NULL) {
3715                         DEBUG(0,(__location__ ": Failed to form conflict DN for %s\n",
3716                                  ldb_dn_get_linearized(conflict_dn)));
3717                         goto failed;
3718                 }
3719
3720                 DEBUG(2,(__location__ ": Resolving conflict record via incoming rename '%s' -> '%s'\n",
3721                          ldb_dn_get_linearized(conflict_dn), ldb_dn_get_linearized(new_dn)));
3722
3723                 /* re-submit the request, but with a different
3724                    callback, so we don't loop forever. */
3725                 msg->dn = new_dn;
3726                 req->callback = replmd_op_name_modify_callback;
3727
3728                 return ldb_next_request(ar->module, req);
3729         } else {
3730                 /* we are renaming the existing record */
3731                 struct GUID guid;
3732                 struct ldb_dn *new_dn;
3733
3734                 guid = samdb_result_guid(res->msgs[0], "objectGUID");
3735                 if (GUID_all_zero(&guid)) {
3736                         DEBUG(0,(__location__ ": Failed to find objectGUID for existing conflict record %s\n",
3737                                  ldb_dn_get_linearized(conflict_dn)));
3738                         goto failed;
3739                 }
3740
3741                 new_dn = replmd_conflict_dn(req, conflict_dn, &guid);
3742                 if (new_dn == NULL) {
3743                         DEBUG(0,(__location__ ": Failed to form conflict DN for %s\n",
3744                                  ldb_dn_get_linearized(conflict_dn)));
3745                         goto failed;
3746                 }
3747
3748                 DEBUG(2,(__location__ ": Resolving conflict record via existing rename '%s' -> '%s'\n",
3749                          ldb_dn_get_linearized(conflict_dn), ldb_dn_get_linearized(new_dn)));
3750
3751                 ret = dsdb_module_rename(ar->module, conflict_dn, new_dn,
3752                                          DSDB_FLAG_OWN_MODULE, req);
3753                 if (ret != LDB_SUCCESS) {
3754                         DEBUG(0,(__location__ ": Failed to rename conflict dn '%s' to '%s' - %s\n",
3755                                  ldb_dn_get_linearized(conflict_dn),
3756                                  ldb_dn_get_linearized(new_dn),
3757                                  ldb_errstring(ldb_module_get_ctx(ar->module))));
3758                         goto failed;
3759                 }
3760
3761                 /*
3762                  * now we need to ensure that the rename is seen as an
3763                  * originating update. We do that with a modify.
3764                  */
3765                 ret = replmd_name_modify(ar, req, new_dn);
3766                 if (ret != LDB_SUCCESS) {
3767                         goto failed;
3768                 }
3769
3770                 return ldb_next_request(ar->module, req);
3771         }
3772
3773 failed:
3774         /* on failure do the original callback. This means replication
3775          * will stop with an error, but there is not much else we can
3776          * do
3777          */
3778         return ldb_module_done(req, ares->controls, ares->response, ares->error);
3779 }
3780
3781 /*
3782   callback for replmd_replicated_apply_add()
3783   This copes with the creation of conflict records in the case where
3784   the DN exists, but with a different objectGUID
3785  */
3786 static int replmd_op_add_callback(struct ldb_request *req, struct ldb_reply *ares)
3787 {
3788         struct replmd_replicated_request *ar =
3789                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
3790
3791         if (ar->objs->objects[ar->index_current].last_known_parent) {
3792                 /* This is like a conflict DN, where we put the object in LostAndFound
3793                    see MS-DRSR 4.1.10.6.10 FindBestParentObject */
3794                 return replmd_op_possible_conflict_callback(req, ares, replmd_op_name_modify_callback);
3795         }
3796
3797         return replmd_op_possible_conflict_callback(req, ares, replmd_op_callback);
3798 }
3799
3800 /*
3801   callback for replmd_replicated_handle_rename()
3802   This copes with the creation of conflict records in the case where
3803   the DN exists, but with a different objectGUID
3804  */
3805 static int replmd_op_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
3806 {
3807         return replmd_op_possible_conflict_callback(req, ares, ldb_modify_default_callback);
3808 }
3809
3810 /*
3811   this is called when a new object comes in over DRS
3812  */
3813 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
3814 {
3815         struct ldb_context *ldb;
3816         struct ldb_request *change_req;
3817         enum ndr_err_code ndr_err;
3818         struct ldb_message *msg;
3819         struct replPropertyMetaDataBlob *md;
3820         struct ldb_val md_value;
3821         unsigned int i;
3822         int ret;
3823         bool remote_isDeleted = false;
3824
3825         ldb = ldb_module_get_ctx(ar->module);
3826         msg = ar->objs->objects[ar->index_current].msg;
3827         md = ar->objs->objects[ar->index_current].meta_data;
3828
3829         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
3830         if (ret != LDB_SUCCESS) {
3831                 return replmd_replicated_request_error(ar, ret);
3832         }
3833
3834         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
3835         if (ret != LDB_SUCCESS) {
3836                 return replmd_replicated_request_error(ar, ret);
3837         }
3838
3839         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
3840         if (ret != LDB_SUCCESS) {
3841                 return replmd_replicated_request_error(ar, ret);
3842         }
3843
3844         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
3845         if (ret != LDB_SUCCESS) {
3846                 return replmd_replicated_request_error(ar, ret);
3847         }
3848
3849         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
3850         if (ret != LDB_SUCCESS) {
3851                 return replmd_replicated_request_error(ar, ret);
3852         }
3853
3854         /* remove any message elements that have zero values */
3855         for (i=0; i<msg->num_elements; i++) {
3856                 struct ldb_message_element *el = &msg->elements[i];
3857
3858                 if (el->num_values == 0) {
3859                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
3860                                  el->name));
3861                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
3862                         msg->num_elements--;
3863                         i--;
3864                         continue;
3865                 }
3866         }
3867
3868         remote_isDeleted = ldb_msg_find_attr_as_bool(msg,
3869                                                      "isDeleted", false);
3870
3871         /*
3872          * the meta data array is already sorted by the caller
3873          */
3874         for (i=0; i < md->ctr.ctr1.count; i++) {
3875                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
3876         }
3877         ndr_err = ndr_push_struct_blob(&md_value, msg, md,
3878                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
3879         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3880                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3881                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3882         }
3883         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
3884         if (ret != LDB_SUCCESS) {
3885                 return replmd_replicated_request_error(ar, ret);
3886         }
3887
3888         replmd_ldb_message_sort(msg, ar->schema);
3889
3890         if (!remote_isDeleted) {
3891                 ret = dsdb_module_schedule_sd_propagation(ar->module,
3892                                                           ar->objs->partition_dn,
3893                                                           msg->dn, true);
3894                 if (ret != LDB_SUCCESS) {
3895                         return replmd_replicated_request_error(ar, ret);
3896                 }
3897         }
3898
3899         ar->isDeleted = remote_isDeleted;
3900
3901         if (DEBUGLVL(4)) {
3902                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
3903                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
3904                 talloc_free(s);
3905         }
3906
3907         ret = ldb_build_add_req(&change_req,
3908                                 ldb,
3909                                 ar,
3910                                 msg,
3911                                 ar->controls,
3912                                 ar,
3913                                 replmd_op_add_callback,
3914                                 ar->req);
3915         LDB_REQ_SET_LOCATION(change_req);
3916         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3917
3918         /* current partition control needed by "repmd_op_callback" */
3919         ret = ldb_request_add_control(change_req,
3920                                       DSDB_CONTROL_CURRENT_PARTITION_OID,
3921                                       false, NULL);
3922         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3923
3924         if (ar->objs->dsdb_repl_flags & DSDB_REPL_FLAG_PARTIAL_REPLICA) {
3925                 /* this tells the partition module to make it a
3926                    partial replica if creating an NC */
3927                 ret = ldb_request_add_control(change_req,
3928                                               DSDB_CONTROL_PARTIAL_REPLICA,
3929                                               false, NULL);
3930                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3931         }
3932
3933         return ldb_next_request(ar->module, change_req);
3934 }
3935
3936 static int replmd_replicated_apply_search_for_parent_callback(struct ldb_request *req,
3937                                                               struct ldb_reply *ares)
3938 {
3939         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3940                                                struct replmd_replicated_request);
3941         int ret;
3942
3943         if (!ares) {
3944                 return ldb_module_done(ar->req, NULL, NULL,
3945                                         LDB_ERR_OPERATIONS_ERROR);
3946         }
3947         if (ares->error != LDB_SUCCESS &&
3948             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3949                 /*
3950                  * TODO: deal with the above error that the parent object doesn't exist
3951                  */
3952
3953                 return ldb_module_done(ar->req, ares->controls,
3954                                         ares->response, ares->error);
3955         }
3956
3957         switch (ares->type) {
3958         case LDB_REPLY_ENTRY:
3959         {
3960                 struct ldb_message *parent_msg = ares->message;
3961                 struct ldb_message *msg = ar->objs->objects[ar->index_current].msg;
3962                 struct ldb_dn *parent_dn;
3963                 int comp_num;
3964
3965                 if (!ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")
3966                     && ldb_msg_check_string_attribute(parent_msg, "isDeleted", "TRUE")) {
3967                         /* Per MS-DRSR 4.1.10.6.10
3968                          * FindBestParentObject we need to move this
3969                          * new object under a deleted object to
3970                          * lost-and-found */
3971                         struct ldb_dn *nc_root;
3972
3973                         ret = dsdb_find_nc_root(ldb_module_get_ctx(ar->module), msg, msg->dn, &nc_root);
3974                         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
3975                                 ldb_asprintf_errstring(ldb_module_get_ctx(ar->module),
3976                                                        "No suitable NC root found for %s.  "
3977                                                        "We need to move this object because parent object %s "
3978                                                        "is deleted, but this object is not.",
3979                                                        ldb_dn_get_linearized(msg->dn),
3980                                                        ldb_dn_get_linearized(parent_msg->dn));
3981                                 return ldb_module_done(ar->req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
3982                         } else if (ret != LDB_SUCCESS) {
3983                                 ldb_asprintf_errstring(ldb_module_get_ctx(ar->module),
3984                                                        "Unable to find NC root for %s: %s. "
3985                                                        "We need to move this object because parent object %s "
3986                                                        "is deleted, but this object is not.",
3987                                                        ldb_dn_get_linearized(msg->dn),
3988                                                        ldb_errstring(ldb_module_get_ctx(ar->module)),
3989                                                        ldb_dn_get_linearized(parent_msg->dn));
3990                                 return ldb_module_done(ar->req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
3991                         }
3992
3993                         ret = dsdb_wellknown_dn(ldb_module_get_ctx(ar->module), msg,
3994                                                 nc_root,
3995                                                 DS_GUID_LOSTANDFOUND_CONTAINER,
3996                                                 &parent_dn);
3997                         if (ret != LDB_SUCCESS) {
3998                                 ldb_asprintf_errstring(ldb_module_get_ctx(ar->module),
3999                                                        "Unable to find LostAndFound Container for %s "
4000                                                        "in partition %s: %s. "
4001                                                        "We need to move this object because parent object %s "
4002                                                        "is deleted, but this object is not.",
4003                                                        ldb_dn_get_linearized(msg->dn), ldb_dn_get_linearized(nc_root),
4004                                                        ldb_errstring(ldb_module_get_ctx(ar->module)),
4005                                                        ldb_dn_get_linearized(parent_msg->dn));
4006                                 return ldb_module_done(ar->req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
4007                         }
4008                         ar->objs->objects[ar->index_current].last_known_parent
4009                                 = talloc_steal(ar->objs->objects[ar->index_current].msg, parent_msg->dn);
4010                 } else {
4011                         parent_dn = parent_msg->dn;
4012                 }
4013
4014                 comp_num = ldb_dn_get_comp_num(msg->dn);
4015                 if (comp_num > 1) {
4016                         if (!ldb_dn_remove_base_components(msg->dn, comp_num - 1)) {
4017                                 talloc_free(ares);
4018                                 return ldb_module_done(ar->req, NULL, NULL, ldb_module_operr(ar->module));
4019                         }
4020                 }
4021                 if (!ldb_dn_add_base(msg->dn, parent_dn)) {
4022                         talloc_free(ares);
4023                         return ldb_module_done(ar->req, NULL, NULL, ldb_module_operr(ar->module));
4024                 }
4025                 break;
4026         }
4027         case LDB_REPLY_REFERRAL:
4028                 /* we ignore referrals */
4029                 break;
4030
4031         case LDB_REPLY_DONE:
4032                 if (ar->search_msg != NULL) {
4033                         ret = replmd_replicated_apply_merge(ar);
4034                 } else {
4035                         ret = replmd_replicated_apply_add(ar);
4036                 }
4037                 if (ret != LDB_SUCCESS) {
4038                         return ldb_module_done(ar->req, NULL, NULL, ret);
4039                 }
4040         }
4041
4042         talloc_free(ares);
4043         return LDB_SUCCESS;
4044 }
4045
4046 /*
4047  * Look for the parent object, so we put the new object in the right
4048  * place This is akin to NameObject in MS-DRSR - this routine and the
4049  * callbacks find the right parent name, and correct name for this
4050  * object
4051  */
4052
4053 static int replmd_replicated_apply_search_for_parent(struct replmd_replicated_request *ar)
4054 {
4055         struct ldb_context *ldb;
4056         int ret;
4057         char *tmp_str;
4058         char *filter;
4059         struct ldb_request *search_req;
4060         static const char *attrs[] = {"isDeleted", NULL};
4061
4062         ldb = ldb_module_get_ctx(ar->module);
4063
4064         if (!ar->objs->objects[ar->index_current].parent_guid_value.data) {
4065                 if (ar->search_msg != NULL) {
4066                         return replmd_replicated_apply_merge(ar);
4067                 } else {
4068                         return replmd_replicated_apply_add(ar);
4069                 }
4070         }
4071
4072         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].parent_guid_value);
4073         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4074
4075         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
4076         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4077         talloc_free(tmp_str);
4078
4079         ret = ldb_build_search_req(&search_req,
4080                                    ldb,
4081                                    ar,
4082                                    ar->objs->partition_dn,
4083                                    LDB_SCOPE_SUBTREE,
4084                                    filter,
4085                                    attrs,
4086                                    NULL,
4087                                    ar,
4088                                    replmd_replicated_apply_search_for_parent_callback,
4089                                    ar->req);
4090         LDB_REQ_SET_LOCATION(search_req);
4091
4092         ret = dsdb_request_add_controls(search_req,
4093                                         DSDB_SEARCH_SHOW_RECYCLED|
4094                                         DSDB_SEARCH_SHOW_DELETED|
4095                                         DSDB_SEARCH_SHOW_EXTENDED_DN);
4096         if (ret != LDB_SUCCESS) {
4097                 return ret;
4098         }
4099
4100         return ldb_next_request(ar->module, search_req);
4101 }
4102
4103 /*
4104   handle renames that come in over DRS replication
4105  */
4106 static int replmd_replicated_handle_rename(struct replmd_replicated_request *ar,
4107                                            struct ldb_message *msg,
4108                                            struct ldb_request *parent)
4109 {
4110         struct ldb_request *req;
4111         int ret;
4112         TALLOC_CTX *tmp_ctx = talloc_new(msg);
4113         struct ldb_result *res;
4114
4115         DEBUG(4,("replmd_replicated_request rename %s => %s\n",
4116                  ldb_dn_get_linearized(ar->search_msg->dn),
4117                  ldb_dn_get_linearized(msg->dn)));
4118
4119
4120         res = talloc_zero(tmp_ctx, struct ldb_result);
4121         if (!res) {
4122                 talloc_free(tmp_ctx);
4123                 return ldb_oom(ldb_module_get_ctx(ar->module));
4124         }
4125
4126         /* pass rename to the next module
4127          * so it doesn't appear as an originating update */
4128         ret = ldb_build_rename_req(&req, ldb_module_get_ctx(ar->module), tmp_ctx,
4129                                    ar->search_msg->dn, msg->dn,
4130                                    NULL,
4131                                    ar,
4132                                    replmd_op_rename_callback,
4133                                    parent);
4134         LDB_REQ_SET_LOCATION(req);
4135         if (ret != LDB_SUCCESS) {
4136                 talloc_free(tmp_ctx);
4137                 return ret;
4138         }
4139
4140         ret = dsdb_request_add_controls(req, DSDB_MODIFY_RELAX);
4141         if (ret != LDB_SUCCESS) {
4142                 talloc_free(tmp_ctx);
4143                 return ret;
4144         }
4145
4146         ret = ldb_next_request(ar->module, req);
4147
4148         if (ret == LDB_SUCCESS) {
4149                 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
4150         }
4151
4152         talloc_free(tmp_ctx);
4153         return ret;
4154 }
4155
4156
4157 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
4158 {
4159         struct ldb_context *ldb;
4160         struct ldb_request *change_req;
4161         enum ndr_err_code ndr_err;
4162         struct ldb_message *msg;
4163         struct replPropertyMetaDataBlob *rmd;
4164         struct replPropertyMetaDataBlob omd;
4165         const struct ldb_val *omd_value;
4166         struct replPropertyMetaDataBlob nmd;
4167         struct ldb_val nmd_value;
4168         unsigned int i;
4169         uint32_t j,ni=0;
4170         unsigned int removed_attrs = 0;
4171         int ret;
4172         int (*callback)(struct ldb_request *req, struct ldb_reply *ares) = replmd_op_callback;
4173         bool isDeleted = false;
4174         bool local_isDeleted = false;
4175         bool remote_isDeleted = false;
4176         bool take_remote_isDeleted = false;
4177         bool sd_updated = false;
4178         bool renamed = false;
4179
4180         ldb = ldb_module_get_ctx(ar->module);
4181         msg = ar->objs->objects[ar->index_current].msg;
4182
4183         rmd = ar->objs->objects[ar->index_current].meta_data;
4184         ZERO_STRUCT(omd);
4185         omd.version = 1;
4186
4187         /* find existing meta data */
4188         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
4189         if (omd_value) {
4190                 ndr_err = ndr_pull_struct_blob(omd_value, ar, &omd,
4191                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
4192                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4193                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4194                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4195                 }
4196
4197                 if (omd.version != 1) {
4198                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
4199                 }
4200         }
4201
4202         local_isDeleted = ldb_msg_find_attr_as_bool(ar->search_msg,
4203                                                     "isDeleted", false);
4204         remote_isDeleted = ldb_msg_find_attr_as_bool(msg,
4205                                                      "isDeleted", false);
4206
4207         if (strcmp(ldb_dn_get_linearized(msg->dn), ldb_dn_get_linearized(ar->search_msg->dn)) == 0) {
4208                 ret = LDB_SUCCESS;
4209         } else {
4210                 /*
4211                  * handle renames, even just by case that come in over
4212                  * DRS.  Changes in the parent DN don't hit us here,
4213                  * because the search for a parent will clean up those
4214                  * components.
4215                  *
4216                  * We also have already filtered out the case where
4217                  * the peer has an older name to what we have (see
4218                  * replmd_replicated_apply_search_callback())
4219                  */
4220                 renamed = true;
4221                 ret = replmd_replicated_handle_rename(ar, msg, ar->req);
4222         }
4223
4224         /*
4225          * This particular error code means that we already tried the
4226          * conflict algrorithm, and the existing record name was newer, so we
4227          * need to rename the incoming record
4228          */
4229         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
4230                 struct GUID guid;
4231                 NTSTATUS status;
4232                 struct ldb_dn *new_dn;
4233                 status = GUID_from_ndr_blob(&ar->objs->objects[ar->index_current].guid_value, &guid);
4234                 /* This really, really can't fail */
4235                 SMB_ASSERT(NT_STATUS_IS_OK(status));
4236
4237                 new_dn = replmd_conflict_dn(msg, msg->dn, &guid);
4238                 if (new_dn == NULL) {
4239                         ldb_asprintf_errstring(ldb_module_get_ctx(ar->module),
4240                                                                   "Failed to form conflict DN for %s\n",
4241                                                                   ldb_dn_get_linearized(msg->dn));
4242
4243                         return replmd_replicated_request_werror(ar, WERR_NOMEM);
4244                 }
4245
4246                 ret = dsdb_module_rename(ar->module, ar->search_msg->dn, new_dn,
4247                                          DSDB_FLAG_NEXT_MODULE, ar->req);
4248                 if (ret != LDB_SUCCESS) {
4249                         ldb_asprintf_errstring(ldb_module_get_ctx(ar->module),
4250                                                "Failed to rename incoming conflicting dn '%s' (was '%s') to '%s' - %s\n",
4251                                                ldb_dn_get_linearized(msg->dn),
4252                                                ldb_dn_get_linearized(ar->search_msg->dn),
4253                                                ldb_dn_get_linearized(new_dn),
4254                                                ldb_errstring(ldb_module_get_ctx(ar->module)));
4255                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
4256                 }
4257
4258                 /* Set the callback to one that will fix up the name to be a conflict DN */
4259                 callback = replmd_op_name_modify_callback;
4260                 msg->dn = new_dn;
4261                 renamed = true;
4262         } else if (ret != LDB_SUCCESS) {
4263                 ldb_debug(ldb, LDB_DEBUG_FATAL,
4264                           "replmd_replicated_request rename %s => %s failed - %s\n",
4265                           ldb_dn_get_linearized(ar->search_msg->dn),
4266                           ldb_dn_get_linearized(msg->dn),
4267                           ldb_errstring(ldb));
4268                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
4269         }
4270
4271         ZERO_STRUCT(nmd);
4272         nmd.version = 1;
4273         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
4274         nmd.ctr.ctr1.array = talloc_array(ar,
4275                                           struct replPropertyMetaData1,
4276                                           nmd.ctr.ctr1.count);
4277         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4278
4279         /* first copy the old meta data */
4280         for (i=0; i < omd.ctr.ctr1.count; i++) {
4281                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
4282                 ni++;
4283         }
4284
4285         ar->seq_num = 0;
4286         /* now merge in the new meta data */
4287         for (i=0; i < rmd->ctr.ctr1.count; i++) {
4288                 bool found = false;
4289
4290                 for (j=0; j < ni; j++) {
4291                         bool cmp;
4292
4293                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
4294                                 continue;
4295                         }
4296
4297                         if (ar->objs->dsdb_repl_flags & DSDB_REPL_FLAG_PRIORITISE_INCOMING) {
4298                                 /* if we compare equal then do an
4299                                    update. This is used when a client
4300                                    asks for a FULL_SYNC, and can be
4301                                    used to recover a corrupt
4302                                    replica */
4303                                 cmp = !replmd_replPropertyMetaData1_is_newer(&rmd->ctr.ctr1.array[i],
4304                                                                              &nmd.ctr.ctr1.array[j]);
4305                         } else {
4306                                 cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
4307                                                                             &rmd->ctr.ctr1.array[i]);
4308                         }
4309                         if (cmp) {
4310                                 /* replace the entry */
4311                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
4312                                 if (ar->seq_num == 0) {
4313                                         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
4314                                         if (ret != LDB_SUCCESS) {
4315                                                 return replmd_replicated_request_error(ar, ret);
4316                                         }
4317                                 }
4318                                 nmd.ctr.ctr1.array[j].local_usn = ar->seq_num;
4319                                 switch (nmd.ctr.ctr1.array[j].attid) {
4320                                 case DRSUAPI_ATTID_ntSecurityDescriptor:
4321                                         sd_updated = true;
4322                                         break;
4323                                 case DRSUAPI_ATTID_isDeleted:
4324                                         take_remote_isDeleted = true;
4325                                         break;
4326                                 default:
4327                                         break;
4328                                 }
4329                                 found = true;
4330                                 break;
4331                         }
4332
4333                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTID_instanceType) {
4334                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
4335                                          msg->elements[i-removed_attrs].name,
4336                                          ldb_dn_get_linearized(msg->dn),
4337                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
4338                         }
4339
4340                         /* we don't want to apply this change so remove the attribute */
4341                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
4342                         removed_attrs++;
4343
4344                         found = true;
4345                         break;
4346                 }
4347
4348                 if (found) continue;
4349
4350                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
4351                 if (ar->seq_num == 0) {
4352                         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
4353                         if (ret != LDB_SUCCESS) {
4354                                 return replmd_replicated_request_error(ar, ret);
4355                         }
4356                 }
4357                 nmd.ctr.ctr1.array[ni].local_usn = ar->seq_num;
4358                 switch (nmd.ctr.ctr1.array[ni].attid) {
4359                 case DRSUAPI_ATTID_ntSecurityDescriptor:
4360                         sd_updated = true;
4361                         break;
4362                 case DRSUAPI_ATTID_isDeleted:
4363                         take_remote_isDeleted = true;
4364                         break;
4365                 default:
4366                         break;
4367                 }
4368                 ni++;
4369         }
4370
4371         /*
4372          * finally correct the size of the meta_data array
4373          */
4374         nmd.ctr.ctr1.count = ni;
4375
4376         /*
4377          * the rdn attribute (the alias for the name attribute),
4378          * 'cn' for most objects is the last entry in the meta data array
4379          * we have stored
4380          *
4381          * sort the new meta data array
4382          */
4383         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
4384         if (ret != LDB_SUCCESS) {
4385                 return ret;
4386         }
4387
4388         /*
4389          * Work out if this object is deleted, so we can prune any extra attributes.  See MS-DRSR 4.1.10.6.9
4390          * UpdateObject.
4391          *
4392          * This also controls SD propagation below
4393          */
4394         if (take_remote_isDeleted) {
4395                 isDeleted = remote_isDeleted;
4396         } else {
4397                 isDeleted = local_isDeleted;
4398         }
4399
4400         ar->isDeleted = isDeleted;
4401
4402         /*
4403          * check if some replicated attributes left, otherwise skip the ldb_modify() call
4404          */
4405         if (msg->num_elements == 0) {
4406                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
4407                           ar->index_current);
4408
4409                 return replmd_replicated_apply_isDeleted(ar);
4410         }
4411
4412         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
4413                   ar->index_current, msg->num_elements);
4414
4415         if (renamed) {
4416                 sd_updated = true;
4417         }
4418
4419         if (sd_updated && !isDeleted) {
4420                 ret = dsdb_module_schedule_sd_propagation(ar->module,
4421                                                           ar->objs->partition_dn,
4422                                                           msg->dn, true);
4423                 if (ret != LDB_SUCCESS) {
4424                         return ldb_operr(ldb);
4425                 }
4426         }
4427
4428         /* create the meta data value */
4429         ndr_err = ndr_push_struct_blob(&nmd_value, msg, &nmd,
4430                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
4431         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4432                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4433                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4434         }
4435
4436         /*
4437          * when we know that we'll modify the record, add the whenChanged, uSNChanged
4438          * and replPopertyMetaData attributes
4439          */
4440         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
4441         if (ret != LDB_SUCCESS) {
4442                 return replmd_replicated_request_error(ar, ret);
4443         }
4444         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
4445         if (ret != LDB_SUCCESS) {
4446                 return replmd_replicated_request_error(ar, ret);
4447         }
4448         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
4449         if (ret != LDB_SUCCESS) {
4450                 return replmd_replicated_request_error(ar, ret);
4451         }
4452
4453         replmd_ldb_message_sort(msg, ar->schema);
4454
4455         /* we want to replace the old values */
4456         for (i=0; i < msg->num_elements; i++) {
4457                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
4458         }
4459
4460         if (DEBUGLVL(4)) {
4461                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
4462                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
4463                 talloc_free(s);
4464         }
4465
4466         ret = ldb_build_mod_req(&change_req,
4467                                 ldb,
4468                                 ar,
4469                                 msg,
4470                                 ar->controls,
4471                                 ar,
4472                                 callback,
4473                                 ar->req);
4474         LDB_REQ_SET_LOCATION(change_req);
4475         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
4476
4477         /* current partition control needed by "repmd_op_callback" */
4478         ret = ldb_request_add_control(change_req,
4479                                       DSDB_CONTROL_CURRENT_PARTITION_OID,
4480                                       false, NULL);
4481         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
4482
4483         return ldb_next_request(ar->module, change_req);
4484 }
4485
4486 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
4487                                                    struct ldb_reply *ares)
4488 {
4489         struct replmd_replicated_request *ar = talloc_get_type(req->context,
4490                                                struct replmd_replicated_request);
4491         int ret;
4492
4493         if (!ares) {
4494                 return ldb_module_done(ar->req, NULL, NULL,
4495                                         LDB_ERR_OPERATIONS_ERROR);
4496         }
4497         if (ares->error != LDB_SUCCESS &&
4498             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
4499                 return ldb_module_done(ar->req, ares->controls,
4500                                         ares->response, ares->error);
4501         }
4502
4503         switch (ares->type) {
4504         case LDB_REPLY_ENTRY:
4505                 ar->search_msg = talloc_steal(ar, ares->message);
4506                 break;
4507
4508         case LDB_REPLY_REFERRAL:
4509                 /* we ignore referrals */
4510                 break;
4511
4512         case LDB_REPLY_DONE:
4513         {
4514                 struct replPropertyMetaData1 *md_remote;
4515                 struct replPropertyMetaData1 *md_local;
4516
4517                 struct replPropertyMetaDataBlob omd;
4518                 const struct ldb_val *omd_value;
4519                 struct replPropertyMetaDataBlob *rmd;
4520                 struct ldb_message *msg;
4521
4522                 ar->objs->objects[ar->index_current].last_known_parent = NULL;
4523
4524                 /*
4525                  * This is the ADD case, find the appropriate parent,
4526                  * as this object doesn't exist locally:
4527                  */
4528                 if (ar->search_msg == NULL) {
4529                         ret = replmd_replicated_apply_search_for_parent(ar);
4530                         if (ret != LDB_SUCCESS) {
4531                                 return ldb_module_done(ar->req, NULL, NULL, ret);
4532                         }
4533                         talloc_free(ares);
4534                         return LDB_SUCCESS;
4535                 }
4536
4537                 /*
4538                  * Otherwise, in the MERGE case, work out if we are
4539                  * attempting a rename, and if so find the parent the
4540                  * newly renamed object wants to belong under (which
4541                  * may not be the parent in it's attached string DN
4542                  */
4543                 rmd = ar->objs->objects[ar->index_current].meta_data;
4544                 ZERO_STRUCT(omd);
4545                 omd.version = 1;
4546
4547                 /* find existing meta data */
4548                 omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
4549                 if (omd_value) {
4550                         enum ndr_err_code ndr_err;
4551                         ndr_err = ndr_pull_struct_blob(omd_value, ar, &omd,
4552                                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
4553                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4554                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4555                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4556                         }
4557
4558                         if (omd.version != 1) {
4559                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
4560                         }
4561                 }
4562
4563                 /*
4564                  * now we need to check for double renames. We could have a
4565                  * local rename pending which our replication partner hasn't
4566                  * received yet. We choose which one wins by looking at the
4567                  * attribute stamps on the two objects, the newer one wins
4568                  */
4569                 md_remote = replmd_replPropertyMetaData1_find_attid(rmd, DRSUAPI_ATTID_name);
4570                 md_local  = replmd_replPropertyMetaData1_find_attid(&omd, DRSUAPI_ATTID_name);
4571                 /* if there is no name attribute then we have to assume the
4572                    object we've received is in fact newer */
4573                 if (ar->objs->dsdb_repl_flags & DSDB_REPL_FLAG_PRIORITISE_INCOMING ||
4574                     !md_remote || !md_local ||
4575                     replmd_replPropertyMetaData1_is_newer(md_local, md_remote)) {
4576                         ret = replmd_replicated_apply_search_for_parent(ar);
4577                 } else {
4578                         msg = ar->objs->objects[ar->index_current].msg;
4579
4580                         /* Otherwise, just merge on the existing object, force no rename */
4581                         DEBUG(4,(__location__ ": Keeping object %s and rejecting older rename to %s\n",
4582                                  ldb_dn_get_linearized(ar->search_msg->dn),
4583                                  ldb_dn_get_linearized(msg->dn)));
4584
4585                         /*
4586                          * This assignment ensures that the strcmp()
4587                          * in replmd_replicated_apply_merge() avoids
4588                          * the rename call
4589                          */
4590                         msg->dn = ar->search_msg->dn;
4591                         ret = replmd_replicated_apply_merge(ar);
4592                 }
4593                 if (ret != LDB_SUCCESS) {
4594                         return ldb_module_done(ar->req, NULL, NULL, ret);
4595                 }
4596         }
4597         }
4598
4599         talloc_free(ares);
4600         return LDB_SUCCESS;
4601 }
4602
4603 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
4604
4605 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
4606 {
4607         struct ldb_context *ldb;
4608         int ret;
4609         char *tmp_str;
4610         char *filter;
4611         struct ldb_request *search_req;
4612
4613         if (ar->index_current >= ar->objs->num_objects) {
4614                 /* done with it, go to next stage */
4615                 return replmd_replicated_uptodate_vector(ar);
4616         }
4617
4618         ldb = ldb_module_get_ctx(ar->module);
4619         ar->search_msg = NULL;
4620         ar->isDeleted = false;
4621
4622         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
4623         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4624
4625         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
4626         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4627         talloc_free(tmp_str);
4628
4629         ret = ldb_build_search_req(&search_req,
4630                                    ldb,
4631                                    ar,
4632                                    NULL,
4633                                    LDB_SCOPE_SUBTREE,
4634                                    filter,
4635                                    NULL,
4636                                    NULL,
4637                                    ar,
4638                                    replmd_replicated_apply_search_callback,
4639                                    ar->req);
4640         LDB_REQ_SET_LOCATION(search_req);
4641
4642         ret = dsdb_request_add_controls(search_req, DSDB_SEARCH_SEARCH_ALL_PARTITIONS|DSDB_SEARCH_SHOW_RECYCLED);
4643
4644         if (ret != LDB_SUCCESS) {
4645                 return ret;
4646         }
4647
4648         return ldb_next_request(ar->module, search_req);
4649 }
4650
4651 /*
4652  * This is essentially a wrapper for replmd_replicated_apply_next()
4653  *
4654  * This is needed to ensure that both codepaths call this handler.
4655  */
4656 static int replmd_replicated_apply_isDeleted(struct replmd_replicated_request *ar)
4657 {
4658         struct ldb_dn *deleted_objects_dn;
4659         struct ldb_message *msg = ar->objs->objects[ar->index_current].msg;
4660         int ret = dsdb_get_deleted_objects_dn(ldb_module_get_ctx(ar->module), msg, msg->dn,
4661                                               &deleted_objects_dn);
4662         if (ar->isDeleted && (ret != LDB_SUCCESS || ldb_dn_compare(msg->dn, deleted_objects_dn) != 0)) {
4663                 /*
4664                  * Do a delete here again, so that if there is
4665                  * anything local that conflicts with this
4666                  * object being deleted, it is removed.  This
4667                  * includes links.  See MS-DRSR 4.1.10.6.9
4668                  * UpdateObject.
4669                  *
4670                  * If the object is already deleted, and there
4671                  * is no more work required, it doesn't do
4672                  * anything.
4673                  */
4674
4675                 /* This has been updated to point to the DN we eventually did the modify on */
4676
4677                 struct ldb_request *del_req;
4678                 struct ldb_result *res;
4679
4680                 TALLOC_CTX *tmp_ctx = talloc_new(ar);
4681                 if (!tmp_ctx) {
4682                         ret = ldb_oom(ldb_module_get_ctx(ar->module));
4683                         return ret;
4684                 }
4685
4686                 res = talloc_zero(tmp_ctx, struct ldb_result);
4687                 if (!res) {
4688                         ret = ldb_oom(ldb_module_get_ctx(ar->module));
4689                         talloc_free(tmp_ctx);
4690                         return ret;
4691                 }
4692
4693                 /* Build a delete request, which hopefully will artually turn into nothing */
4694                 ret = ldb_build_del_req(&del_req, ldb_module_get_ctx(ar->module), tmp_ctx,
4695                                         msg->dn,
4696                                         NULL,
4697                                         res,
4698                                         ldb_modify_default_callback,
4699                                         ar->req);
4700                 LDB_REQ_SET_LOCATION(del_req);
4701                 if (ret != LDB_SUCCESS) {
4702                         talloc_free(tmp_ctx);
4703                         return ret;
4704                 }
4705
4706                 /*
4707                  * This is the guts of the call, call back
4708                  * into our delete code, but setting the
4709                  * re_delete flag so we delete anything that
4710                  * shouldn't be there on a deleted or recycled
4711                  * object
4712                  */
4713                 ret = replmd_delete_internals(ar->module, del_req, true);
4714                 if (ret == LDB_SUCCESS) {
4715                         ret = ldb_wait(del_req->handle, LDB_WAIT_ALL);
4716                 }
4717
4718                 talloc_free(tmp_ctx);
4719                 if (ret != LDB_SUCCESS) {
4720                         return ret;
4721                 }
4722         }
4723
4724         ar->index_current++;
4725         return replmd_replicated_apply_next(ar);
4726 }
4727
4728 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
4729                                                       struct ldb_reply *ares)
4730 {
4731         struct ldb_context *ldb;
4732         struct replmd_replicated_request *ar = talloc_get_type(req->context,
4733                                                struct replmd_replicated_request);
4734         ldb = ldb_module_get_ctx(ar->module);
4735
4736         if (!ares) {
4737                 return ldb_module_done(ar->req, NULL, NULL,
4738                                         LDB_ERR_OPERATIONS_ERROR);
4739         }
4740         if (ares->error != LDB_SUCCESS) {
4741                 return ldb_module_done(ar->req, ares->controls,
4742                                         ares->response, ares->error);
4743         }
4744
4745         if (ares->type != LDB_REPLY_DONE) {
4746                 ldb_asprintf_errstring(ldb, "Invalid LDB reply type %d", ares->type);
4747                 return ldb_module_done(ar->req, NULL, NULL,
4748                                         LDB_ERR_OPERATIONS_ERROR);
4749         }
4750
4751         talloc_free(ares);
4752
4753         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
4754 }
4755
4756 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
4757 {
4758         struct ldb_context *ldb;
4759         struct ldb_request *change_req;
4760         enum ndr_err_code ndr_err;
4761         struct ldb_message *msg;
4762         struct replUpToDateVectorBlob ouv;
4763         const struct ldb_val *ouv_value;
4764         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
4765         struct replUpToDateVectorBlob nuv;
4766         struct ldb_val nuv_value;
4767         struct ldb_message_element *nuv_el = NULL;
4768         const struct GUID *our_invocation_id;
4769         struct ldb_message_element *orf_el = NULL;
4770         struct repsFromToBlob nrf;
4771         struct ldb_val *nrf_value = NULL;
4772         struct ldb_message_element *nrf_el = NULL;
4773         unsigned int i;
4774         uint32_t j,ni=0;
4775         bool found = false;
4776         time_t t = time(NULL);
4777         NTTIME now;
4778         int ret;
4779         uint32_t instanceType;
4780
4781         ldb = ldb_module_get_ctx(ar->module);
4782         ruv = ar->objs->uptodateness_vector;
4783         ZERO_STRUCT(ouv);
4784         ouv.version = 2;
4785         ZERO_STRUCT(nuv);
4786         nuv.version = 2;
4787
4788         unix_to_nt_time(&now, t);
4789
4790         if (ar->search_msg == NULL) {
4791                 /* this happens for a REPL_OBJ call where we are
4792                    creating the target object by replicating it. The
4793                    subdomain join code does this for the partition DN
4794                 */
4795                 DEBUG(4,(__location__ ": Skipping UDV and repsFrom update as no target DN\n"));
4796                 return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
4797         }
4798
4799         instanceType = ldb_msg_find_attr_as_uint(ar->search_msg, "instanceType", 0);
4800         if (! (instanceType & INSTANCE_TYPE_IS_NC_HEAD)) {
4801                 DEBUG(4,(__location__ ": Skipping UDV and repsFrom update as not NC root: %s\n",
4802                          ldb_dn_get_linearized(ar->search_msg->dn)));
4803                 return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
4804         }
4805
4806         /*
4807          * first create the new replUpToDateVector
4808          */
4809         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
4810         if (ouv_value) {
4811                 ndr_err = ndr_pull_struct_blob(ouv_value, ar, &ouv,
4812                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
4813                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4814                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4815                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4816                 }
4817
4818                 if (ouv.version != 2) {
4819                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
4820                 }
4821         }
4822
4823         /*
4824          * the new uptodateness vector will at least
4825          * contain 1 entry, one for the source_dsa
4826          *
4827          * plus optional values from our old vector and the one from the source_dsa
4828          */
4829         nuv.ctr.ctr2.count = ouv.ctr.ctr2.count;
4830         if (ruv) nuv.ctr.ctr2.count += ruv->count;
4831         nuv.ctr.ctr2.cursors = talloc_array(ar,
4832                                             struct drsuapi_DsReplicaCursor2,
4833                                             nuv.ctr.ctr2.count);
4834         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4835
4836         /* first copy the old vector */
4837         for (i=0; i < ouv.ctr.ctr2.count; i++) {
4838                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
4839                 ni++;
4840         }
4841
4842         /* get our invocation_id if we have one already attached to the ldb */
4843         our_invocation_id = samdb_ntds_invocation_id(ldb);
4844         if (our_invocation_id == NULL) {
4845                 DEBUG(0, ("repl_meta_data: Could not find our own server's invocationID!\n"));
4846                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
4847         }
4848
4849         /* merge in the source_dsa vector is available */
4850         for (i=0; (ruv && i < ruv->count); i++) {
4851                 found = false;
4852
4853                 if (our_invocation_id &&
4854                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
4855                                our_invocation_id)) {
4856                         continue;
4857                 }
4858
4859                 for (j=0; j < ni; j++) {
4860                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
4861                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
4862                                 continue;
4863                         }
4864
4865                         found = true;
4866
4867                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
4868                                 nuv.ctr.ctr2.cursors[j] = ruv->cursors[i];
4869                         }
4870                         break;
4871                 }
4872
4873                 if (found) continue;
4874
4875                 /* if it's not there yet, add it */
4876                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
4877                 ni++;
4878         }
4879
4880         /*
4881          * finally correct the size of the cursors array
4882          */
4883         nuv.ctr.ctr2.count = ni;
4884
4885         /*
4886          * sort the cursors
4887          */
4888         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
4889
4890         /*
4891          * create the change ldb_message
4892          */
4893         msg = ldb_msg_new(ar);
4894         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4895         msg->dn = ar->search_msg->dn;
4896
4897         ndr_err = ndr_push_struct_blob(&nuv_value, msg, &nuv,
4898                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
4899         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4900                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4901                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4902         }
4903         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
4904         if (ret != LDB_SUCCESS) {
4905                 return replmd_replicated_request_error(ar, ret);
4906         }
4907         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
4908
4909         /*
4910          * now create the new repsFrom value from the given repsFromTo1 structure
4911          */
4912         ZERO_STRUCT(nrf);
4913         nrf.version                                     = 1;
4914         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
4915         nrf.ctr.ctr1.last_attempt                       = now;
4916         nrf.ctr.ctr1.last_success                       = now;
4917         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
4918
4919         /*
4920          * first see if we already have a repsFrom value for the current source dsa
4921          * if so we'll later replace this value
4922          */
4923         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
4924         if (orf_el) {
4925                 for (i=0; i < orf_el->num_values; i++) {
4926                         struct repsFromToBlob *trf;
4927
4928                         trf = talloc(ar, struct repsFromToBlob);
4929                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4930
4931                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, trf,
4932                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
4933                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4934                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4935                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4936                         }
4937
4938                         if (trf->version != 1) {
4939                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
4940                         }
4941
4942                         /*
4943                          * we compare the source dsa objectGUID not the invocation_id
4944                          * because we want only one repsFrom value per source dsa
4945                          * and when the invocation_id of the source dsa has changed we don't need
4946                          * the old repsFrom with the old invocation_id
4947                          */
4948                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
4949                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
4950                                 talloc_free(trf);
4951                                 continue;
4952                         }
4953
4954                         talloc_free(trf);
4955                         nrf_value = &orf_el->values[i];
4956                         break;
4957                 }
4958
4959                 /*
4960                  * copy over all old values to the new ldb_message
4961                  */
4962                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
4963                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
4964                 *nrf_el = *orf_el;
4965         }
4966
4967         /*
4968          * if we haven't found an old repsFrom value for the current source dsa
4969          * we'll add a new value
4970          */
4971         if (!nrf_value) {
4972                 struct ldb_val zero_value;
4973                 ZERO_STRUCT(zero_value);
4974                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
4975                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
4976
4977                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
4978         }
4979
4980         /* we now fill the value which is already attached to ldb_message */
4981         ndr_err = ndr_push_struct_blob(nrf_value, msg,
4982                                        &nrf,
4983                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
4984         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4985                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4986                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4987         }
4988
4989         /*
4990          * the ldb_message_element for the attribute, has all the old values and the new one
4991          * so we'll replace the whole attribute with all values
4992          */
4993         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
4994
4995         if (CHECK_DEBUGLVL(4)) {
4996                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
4997                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
4998                 talloc_free(s);
4999         }
5000
5001         /* prepare the ldb_modify() request */
5002         ret = ldb_build_mod_req(&change_req,
5003                                 ldb,
5004                                 ar,
5005                                 msg,
5006                                 ar->controls,
5007                                 ar,
5008                                 replmd_replicated_uptodate_modify_callback,
5009                                 ar->req);
5010         LDB_REQ_SET_LOCATION(change_req);
5011         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
5012
5013         return ldb_next_request(ar->module, change_req);
5014 }
5015
5016 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
5017                                                       struct ldb_reply *ares)
5018 {
5019         struct replmd_replicated_request *ar = talloc_get_type(req->context,
5020                                                struct replmd_replicated_request);
5021         int ret;
5022
5023         if (!ares) {
5024                 return ldb_module_done(ar->req, NULL, NULL,
5025                                         LDB_ERR_OPERATIONS_ERROR);
5026         }
5027         if (ares->error != LDB_SUCCESS &&
5028             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
5029                 return ldb_module_done(ar->req, ares->controls,
5030                                         ares->response, ares->error);
5031         }
5032
5033         switch (ares->type) {
5034         case LDB_REPLY_ENTRY:
5035                 ar->search_msg = talloc_steal(ar, ares->message);
5036                 break;
5037
5038         case LDB_REPLY_REFERRAL:
5039                 /* we ignore referrals */
5040                 break;
5041
5042         case LDB_REPLY_DONE:
5043                 ret = replmd_replicated_uptodate_modify(ar);
5044                 if (ret != LDB_SUCCESS) {
5045                         return ldb_module_done(ar->req, NULL, NULL, ret);
5046                 }
5047         }
5048
5049         talloc_free(ares);
5050         return LDB_SUCCESS;
5051 }
5052
5053
5054 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
5055 {
5056         struct ldb_context *ldb;
5057         int ret;
5058         static const char *attrs[] = {
5059                 "replUpToDateVector",
5060                 "repsFrom",
5061                 "instanceType",
5062                 NULL
5063         };
5064         struct ldb_request *search_req;
5065
5066         ldb = ldb_module_get_ctx(ar->module);
5067         ar->search_msg = NULL;
5068
5069         ret = ldb_build_search_req(&search_req,
5070                                    ldb,
5071                                    ar,
5072                                    ar->objs->partition_dn,
5073                                    LDB_SCOPE_BASE,
5074                                    "(objectClass=*)",
5075                                    attrs,
5076                                    NULL,
5077                                    ar,
5078                                    replmd_replicated_uptodate_search_callback,
5079                                    ar->req);
5080         LDB_REQ_SET_LOCATION(search_req);
5081         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
5082
5083         return ldb_next_request(ar->module, search_req);
5084 }
5085
5086
5087
5088 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
5089 {
5090         struct ldb_context *ldb;
5091         struct dsdb_extended_replicated_objects *objs;
5092         struct replmd_replicated_request *ar;
5093         struct ldb_control **ctrls;
5094         int ret;
5095         uint32_t i;
5096         struct replmd_private *replmd_private =
5097                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
5098         struct dsdb_control_replicated_update *rep_update;
5099
5100         ldb = ldb_module_get_ctx(module);
5101
5102         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
5103
5104         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
5105         if (!objs) {
5106                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
5107                 return LDB_ERR_PROTOCOL_ERROR;
5108         }
5109
5110         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
5111                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
5112                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
5113                 return LDB_ERR_PROTOCOL_ERROR;
5114         }
5115
5116         ar = replmd_ctx_init(module, req);
5117         if (!ar)
5118                 return LDB_ERR_OPERATIONS_ERROR;
5119
5120         /* Set the flags to have the replmd_op_callback run over the full set of objects */
5121         ar->apply_mode = true;
5122         ar->objs = objs;
5123         ar->schema = dsdb_get_schema(ldb, ar);
5124         if (!ar->schema) {
5125                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
5126                 talloc_free(ar);
5127                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
5128                 return LDB_ERR_CONSTRAINT_VIOLATION;
5129         }
5130
5131         ctrls = req->controls;
5132
5133         if (req->controls) {
5134                 req->controls = talloc_memdup(ar, req->controls,
5135                                               talloc_get_size(req->controls));
5136                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
5137         }
5138
5139         /* This allows layers further down to know if a change came in
5140            over replication and what the replication flags were */
5141         rep_update = talloc_zero(ar, struct dsdb_control_replicated_update);
5142         if (rep_update == NULL) {
5143                 return ldb_module_oom(module);
5144         }
5145         rep_update->dsdb_repl_flags = objs->dsdb_repl_flags;
5146
5147         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, rep_update);
5148         if (ret != LDB_SUCCESS) {
5149                 return ret;
5150         }
5151
5152         /* If this change contained linked attributes in the body
5153          * (rather than in the links section) we need to update
5154          * backlinks in linked_attributes */
5155         ret = ldb_request_add_control(req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
5156         if (ret != LDB_SUCCESS) {
5157                 return ret;
5158         }
5159
5160         ar->controls = req->controls;
5161         req->controls = ctrls;
5162
5163         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
5164
5165         /* save away the linked attributes for the end of the
5166            transaction */
5167         for (i=0; i<ar->objs->linked_attributes_count; i++) {
5168                 struct la_entry *la_entry;
5169
5170                 if (replmd_private->la_ctx == NULL) {
5171                         replmd_private->la_ctx = talloc_new(replmd_private);
5172                 }
5173                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
5174                 if (la_entry == NULL) {
5175                         ldb_oom(ldb);
5176                         return LDB_ERR_OPERATIONS_ERROR;
5177                 }
5178                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
5179                 if (la_entry->la == NULL) {
5180                         talloc_free(la_entry);
5181                         ldb_oom(ldb);
5182                         return LDB_ERR_OPERATIONS_ERROR;
5183                 }
5184                 *la_entry->la = ar->objs->linked_attributes[i];
5185
5186                 /* we need to steal the non-scalars so they stay
5187                    around until the end of the transaction */
5188                 talloc_steal(la_entry->la, la_entry->la->identifier);
5189                 talloc_steal(la_entry->la, la_entry->la->value.blob);
5190
5191                 DLIST_ADD(replmd_private->la_list, la_entry);
5192         }
5193
5194         return replmd_replicated_apply_next(ar);
5195 }
5196
5197 /*
5198   process one linked attribute structure
5199  */
5200 static int replmd_process_linked_attribute(struct ldb_module *module,
5201                                            struct la_entry *la_entry,
5202                                            struct ldb_request *parent)
5203 {
5204         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
5205         struct ldb_context *ldb = ldb_module_get_ctx(module);
5206         struct ldb_message *msg;
5207         struct ldb_message *target_msg = NULL;
5208         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
5209         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
5210         int ret;
5211         const struct dsdb_attribute *attr;
5212         struct dsdb_dn *dsdb_dn;
5213         uint64_t seq_num = 0;
5214         struct ldb_message_element *old_el;
5215         WERROR status;
5216         time_t t = time(NULL);
5217         struct ldb_result *res;
5218         struct ldb_result *target_res;
5219         const char *attrs[4];
5220         const char *attrs2[] = { "isDeleted", "isRecycled", NULL };
5221         struct parsed_dn *pdn_list, *pdn;
5222         struct GUID guid = GUID_zero();
5223         NTSTATUS ntstatus;
5224         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
5225         const struct GUID *our_invocation_id;
5226
5227         enum deletion_state deletion_state = OBJECT_NOT_DELETED;
5228         enum deletion_state target_deletion_state = OBJECT_NOT_DELETED;
5229
5230 /*
5231 linked_attributes[0]:
5232      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
5233         identifier               : *
5234             identifier: struct drsuapi_DsReplicaObjectIdentifier
5235                 __ndr_size               : 0x0000003a (58)
5236                 __ndr_size_sid           : 0x00000000 (0)
5237                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
5238                 sid                      : S-0-0
5239                 __ndr_size_dn            : 0x00000000 (0)
5240                 dn                       : ''
5241         attid                    : DRSUAPI_ATTID_member (0x1F)
5242         value: struct drsuapi_DsAttributeValue
5243             __ndr_size               : 0x0000007e (126)
5244             blob                     : *
5245                 blob                     : DATA_BLOB length=126
5246         flags                    : 0x00000001 (1)
5247                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
5248         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
5249         meta_data: struct drsuapi_DsReplicaMetaData
5250             version                  : 0x00000015 (21)
5251             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
5252             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
5253             originating_usn          : 0x000000000001e19c (123292)
5254
5255 (for cases where the link is to a normal DN)
5256      &target: struct drsuapi_DsReplicaObjectIdentifier3
5257         __ndr_size               : 0x0000007e (126)
5258         __ndr_size_sid           : 0x0000001c (28)
5259         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
5260         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
5261         __ndr_size_dn            : 0x00000022 (34)
5262         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
5263  */
5264
5265         /* find the attribute being modified */
5266         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
5267         if (attr == NULL) {
5268                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
5269                 talloc_free(tmp_ctx);
5270                 return LDB_ERR_OPERATIONS_ERROR;
5271         }
5272
5273         attrs[0] = attr->lDAPDisplayName;
5274         attrs[1] = "isDeleted";
5275         attrs[1] = "isRecycled";
5276         attrs[2] = NULL;
5277
5278         /* get the existing message from the db for the object with
5279            this GUID, returning attribute being modified. We will then
5280            use this msg as the basis for a modify call */
5281         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
5282                                  DSDB_FLAG_NEXT_MODULE |
5283                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
5284                                  DSDB_SEARCH_SHOW_RECYCLED |
5285                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
5286                                  DSDB_SEARCH_REVEAL_INTERNALS,
5287                                  parent,
5288                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
5289         if (ret != LDB_SUCCESS) {
5290                 talloc_free(tmp_ctx);
5291                 return ret;
5292         }
5293         if (res->count != 1) {
5294                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
5295                                        GUID_string(tmp_ctx, &la->identifier->guid));
5296                 talloc_free(tmp_ctx);
5297                 return LDB_ERR_NO_SUCH_OBJECT;
5298         }
5299         msg = res->msgs[0];
5300
5301         /*
5302          * Check for deleted objects per MS-DRSR 4.1.10.6.13
5303          * ProcessLinkValue, because link updates are not applied to
5304          * recycled and tombstone objects.  We don't have to delete
5305          * any existing link, that should have happened when the
5306          * object deletion was replicated or initiated.
5307          */
5308
5309         replmd_deletion_state(module, msg, &deletion_state, NULL);
5310
5311         if (deletion_state >= OBJECT_RECYCLED) {
5312                 talloc_free(tmp_ctx);
5313                 return LDB_SUCCESS;
5314         }
5315
5316         old_el = ldb_msg_find_element(msg, attr->lDAPDisplayName);
5317         if (old_el == NULL) {
5318                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
5319                 if (ret != LDB_SUCCESS) {
5320                         ldb_module_oom(module);
5321                         talloc_free(tmp_ctx);
5322                         return LDB_ERR_OPERATIONS_ERROR;
5323                 }
5324         } else {
5325                 old_el->flags = LDB_FLAG_MOD_REPLACE;
5326         }
5327
5328         /* parse the existing links */
5329         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid, parent);
5330         if (ret != LDB_SUCCESS) {
5331                 talloc_free(tmp_ctx);
5332                 return ret;
5333         }
5334
5335         /* get our invocationId */
5336         our_invocation_id = samdb_ntds_invocation_id(ldb);
5337         if (!our_invocation_id) {
5338                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
5339                 talloc_free(tmp_ctx);
5340                 return LDB_ERR_OPERATIONS_ERROR;
5341         }
5342
5343         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
5344         if (ret != LDB_SUCCESS) {
5345                 talloc_free(tmp_ctx);
5346                 return ret;
5347         }
5348
5349         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
5350         if (!W_ERROR_IS_OK(status)) {
5351                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
5352                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
5353                 talloc_free(tmp_ctx);
5354                 return LDB_ERR_OPERATIONS_ERROR;
5355         }
5356
5357         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
5358         if (!NT_STATUS_IS_OK(ntstatus) && !active) {
5359                 /*
5360                  * This strange behaviour (allowing a NULL/missing
5361                  * GUID) originally comes from:
5362                  *
5363                  * commit e3054ce0fe0f8f62d2f5b2a77893e7a1479128bd
5364                  * Author: Andrew Tridgell <tridge@samba.org>
5365                  * Date:   Mon Dec 21 21:21:55 2009 +1100
5366                  *
5367                  *  s4-drs: cope better with NULL GUIDS from DRS
5368                  *
5369                  *  It is valid to get a NULL GUID over DRS for a deleted forward link. We
5370                  *  need to match by DN if possible when seeing if we should update an
5371                  *  existing link.
5372                  *
5373                  *  Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
5374                  */
5375
5376                 ret = dsdb_module_search_dn(module, tmp_ctx, &target_res,
5377                                             dsdb_dn->dn, attrs2,
5378                                             DSDB_FLAG_NEXT_MODULE |
5379                                             DSDB_SEARCH_SHOW_RECYCLED |
5380                                             DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
5381                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT,
5382                                             parent);
5383         } else if (!NT_STATUS_IS_OK(ntstatus)) {
5384                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
5385                                        old_el->name,
5386                                        ldb_dn_get_linearized(dsdb_dn->dn),
5387                                        ldb_dn_get_linearized(msg->dn));
5388                 talloc_free(tmp_ctx);
5389                 return LDB_ERR_OPERATIONS_ERROR;
5390         } else {
5391                 ret = dsdb_module_search(module, tmp_ctx, &target_res,
5392                                          NULL, LDB_SCOPE_SUBTREE,
5393                                          attrs2,
5394                                          DSDB_FLAG_NEXT_MODULE |
5395                                          DSDB_SEARCH_SHOW_RECYCLED |
5396                                          DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
5397                                          DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT,
5398                                          parent,
5399                                          "objectGUID=%s",
5400                                          GUID_string(tmp_ctx, &guid));
5401         }
5402
5403         if (ret != LDB_SUCCESS) {
5404                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "Failed to re-resolve GUID %s: %s\n",
5405                                        GUID_string(tmp_ctx, &guid),
5406                                        ldb_errstring(ldb_module_get_ctx(module)));
5407                 talloc_free(tmp_ctx);
5408                 return ret;
5409         }
5410
5411         if (target_res->count == 0) {
5412                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s\n",
5413                          GUID_string(tmp_ctx, &guid),
5414                          ldb_dn_get_linearized(dsdb_dn->dn)));
5415         } else if (target_res->count != 1) {
5416                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "More than one object found matching objectGUID %s\n",
5417                                        GUID_string(tmp_ctx, &guid));
5418                 talloc_free(tmp_ctx);
5419                 return LDB_ERR_OPERATIONS_ERROR;
5420         } else {
5421                 target_msg = target_res->msgs[0];
5422                 dsdb_dn->dn = talloc_steal(dsdb_dn, target_msg->dn);
5423         }
5424
5425         /*
5426          * Check for deleted objects per MS-DRSR 4.1.10.6.13
5427          * ProcessLinkValue, because link updates are not applied to
5428          * recycled and tombstone objects.  We don't have to delete
5429          * any existing link, that should have happened when the
5430          * object deletion was replicated or initiated.
5431          */
5432         replmd_deletion_state(module, target_msg,
5433                               &target_deletion_state, NULL);
5434
5435         if (target_deletion_state >= OBJECT_RECYCLED) {
5436                 talloc_free(tmp_ctx);
5437                 return LDB_SUCCESS;
5438         }
5439
5440         /* see if this link already exists */
5441         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
5442         if (pdn != NULL) {
5443                 /* see if this update is newer than what we have already */
5444                 struct GUID invocation_id = GUID_zero();
5445                 uint32_t version = 0;
5446                 uint32_t originating_usn = 0;
5447                 NTTIME change_time = 0;
5448                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
5449
5450                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
5451                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
5452                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &originating_usn, "RMD_ORIGINATING_USN");
5453                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
5454
5455                 if (!replmd_update_is_newer(&invocation_id,
5456                                             &la->meta_data.originating_invocation_id,
5457                                             version,
5458                                             la->meta_data.version,
5459                                             change_time,
5460                                             la->meta_data.originating_change_time)) {
5461                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
5462                                  old_el->name, ldb_dn_get_linearized(msg->dn),
5463                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
5464                         talloc_free(tmp_ctx);
5465                         return LDB_SUCCESS;
5466                 }
5467
5468                 /* get a seq_num for this change */
5469                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
5470                 if (ret != LDB_SUCCESS) {
5471                         talloc_free(tmp_ctx);
5472                         return ret;
5473                 }
5474
5475                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
5476                         /* remove the existing backlink */
5477                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
5478                         if (ret != LDB_SUCCESS) {
5479                                 talloc_free(tmp_ctx);
5480                                 return ret;
5481                         }
5482                 }
5483
5484                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
5485                                            &la->meta_data.originating_invocation_id,
5486                                            la->meta_data.originating_usn, seq_num,
5487                                            la->meta_data.originating_change_time,
5488                                            la->meta_data.version,
5489                                            !active);
5490                 if (ret != LDB_SUCCESS) {
5491                         talloc_free(tmp_ctx);
5492                         return ret;
5493                 }
5494
5495                 if (active) {
5496                         /* add the new backlink */
5497                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
5498                         if (ret != LDB_SUCCESS) {
5499                                 talloc_free(tmp_ctx);
5500                                 return ret;
5501                         }
5502                 }
5503         } else {
5504                 /* get a seq_num for this change */
5505                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
5506                 if (ret != LDB_SUCCESS) {
5507                         talloc_free(tmp_ctx);
5508                         return ret;
5509                 }
5510
5511                 old_el->values = talloc_realloc(msg->elements, old_el->values,
5512                                                 struct ldb_val, old_el->num_values+1);
5513                 if (!old_el->values) {
5514                         ldb_module_oom(module);
5515                         return LDB_ERR_OPERATIONS_ERROR;
5516                 }
5517                 old_el->num_values++;
5518
5519                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
5520                                           &la->meta_data.originating_invocation_id,
5521                                           la->meta_data.originating_usn, seq_num,
5522                                           la->meta_data.originating_change_time,
5523                                           la->meta_data.version,
5524                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
5525                 if (ret != LDB_SUCCESS) {
5526                         talloc_free(tmp_ctx);
5527                         return ret;
5528                 }
5529
5530                 if (active) {
5531                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
5532                                                   true, attr, false);
5533                         if (ret != LDB_SUCCESS) {
5534                                 talloc_free(tmp_ctx);
5535                                 return ret;
5536                         }
5537                 }
5538         }
5539
5540         /* we only change whenChanged and uSNChanged if the seq_num
5541            has changed */
5542         ret = add_time_element(msg, "whenChanged", t);
5543         if (ret != LDB_SUCCESS) {
5544                 talloc_free(tmp_ctx);
5545                 ldb_operr(ldb);
5546                 return ret;
5547         }
5548
5549         ret = add_uint64_element(ldb, msg, "uSNChanged", seq_num);
5550         if (ret != LDB_SUCCESS) {
5551                 talloc_free(tmp_ctx);
5552                 ldb_operr(ldb);
5553                 return ret;
5554         }
5555
5556         old_el = ldb_msg_find_element(msg, attr->lDAPDisplayName);
5557         if (old_el == NULL) {
5558                 talloc_free(tmp_ctx);
5559                 return ldb_operr(ldb);
5560         }
5561
5562         ret = dsdb_check_single_valued_link(attr, old_el);
5563         if (ret != LDB_SUCCESS) {
5564                 talloc_free(tmp_ctx);
5565                 return ret;
5566         }
5567
5568         old_el->flags |= LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK;
5569
5570         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE, parent);
5571         if (ret != LDB_SUCCESS) {
5572                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
5573                           ldb_errstring(ldb),
5574                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
5575                 talloc_free(tmp_ctx);
5576                 return ret;
5577         }
5578
5579         talloc_free(tmp_ctx);
5580
5581         return ret;
5582 }
5583
5584 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
5585 {
5586         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
5587                 return replmd_extended_replicated_objects(module, req);
5588         }
5589
5590         return ldb_next_request(module, req);
5591 }
5592
5593
5594 /*
5595   we hook into the transaction operations to allow us to
5596   perform the linked attribute updates at the end of the whole
5597   transaction. This allows a forward linked attribute to be created
5598   before the object is created. During a vampire, w2k8 sends us linked
5599   attributes before the objects they are part of.
5600  */
5601 static int replmd_start_transaction(struct ldb_module *module)
5602 {
5603         /* create our private structure for this transaction */
5604         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
5605                                                                 struct replmd_private);
5606         replmd_txn_cleanup(replmd_private);
5607
5608         /* free any leftover mod_usn records from cancelled
5609            transactions */
5610         while (replmd_private->ncs) {
5611                 struct nc_entry *e = replmd_private->ncs;
5612                 DLIST_REMOVE(replmd_private->ncs, e);
5613                 talloc_free(e);
5614         }
5615
5616         return ldb_next_start_trans(module);
5617 }
5618
5619 /*
5620   on prepare commit we loop over our queued la_context structures and
5621   apply each of them
5622  */
5623 static int replmd_prepare_commit(struct ldb_module *module)
5624 {
5625         struct replmd_private *replmd_private =
5626                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
5627         struct la_entry *la, *prev;
5628         struct la_backlink *bl;
5629         int ret;
5630
5631         /* walk the list backwards, to do the first entry first, as we
5632          * added the entries with DLIST_ADD() which puts them at the
5633          * start of the list */
5634         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
5635                 prev = DLIST_PREV(la);
5636                 DLIST_REMOVE(replmd_private->la_list, la);
5637                 ret = replmd_process_linked_attribute(module, la, NULL);
5638                 if (ret != LDB_SUCCESS) {
5639                         replmd_txn_cleanup(replmd_private);
5640                         return ret;
5641                 }
5642         }
5643
5644         /* process our backlink list, creating and deleting backlinks
5645            as necessary */
5646         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
5647                 ret = replmd_process_backlink(module, bl, NULL);
5648                 if (ret != LDB_SUCCESS) {
5649                         replmd_txn_cleanup(replmd_private);
5650                         return ret;
5651                 }
5652         }
5653
5654         replmd_txn_cleanup(replmd_private);
5655
5656         /* possibly change @REPLCHANGED */
5657         ret = replmd_notify_store(module, NULL);
5658         if (ret != LDB_SUCCESS) {
5659                 return ret;
5660         }
5661
5662         return ldb_next_prepare_commit(module);
5663 }
5664
5665 static int replmd_del_transaction(struct ldb_module *module)
5666 {
5667         struct replmd_private *replmd_private =
5668                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
5669         replmd_txn_cleanup(replmd_private);
5670
5671         return ldb_next_del_trans(module);
5672 }
5673
5674
5675 static const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
5676         .name          = "repl_meta_data",
5677         .init_context      = replmd_init,
5678         .add               = replmd_add,
5679         .modify            = replmd_modify,
5680         .rename            = replmd_rename,
5681         .del               = replmd_delete,
5682         .extended          = replmd_extended,
5683         .start_transaction = replmd_start_transaction,
5684         .prepare_commit    = replmd_prepare_commit,
5685         .del_transaction   = replmd_del_transaction,
5686 };
5687
5688 int ldb_repl_meta_data_module_init(const char *version)
5689 {
5690         LDB_MODULE_CHECK_VERSION(version);
5691         return ldb_register_module(&ldb_repl_meta_data_module_ops);
5692 }