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