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