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 static const uint64_t DELETED_OBJECT_CONTAINER_CHANGE_TIME = 253402127999L;
  54 struct replmd_private {
  55         TALLOC_CTX *la_ctx;
  56         struct la_entry *la_list;
  57         TALLOC_CTX *bl_ctx;
  58         struct la_backlink *la_backlinks;
  59         struct nc_entry {
  60                 struct nc_entry *prev, *next;
  61                 struct ldb_dn *dn;
  62                 uint64_t mod_usn;
  63                 uint64_t mod_usn_urgent;
  64         } *ncs;
  65 };
  66
  67 struct la_entry {
  68         struct la_entry *next, *prev;
  69         struct drsuapi_DsReplicaLinkedAttribute *la;
  70 };
  71
  72 struct replmd_replicated_request {
  73         struct ldb_module *module;
  74         struct ldb_request *req;
  75
  76         const struct dsdb_schema *schema;
  77
  78         /* the controls we pass down */
  79         struct ldb_control **controls;
  80
  81         /* details for the mode where we apply a bunch of inbound replication meessages */
  82         bool apply_mode;
  83         uint32_t index_current;
  84         struct dsdb_extended_replicated_objects *objs;
  85
  86         struct ldb_message *search_msg;
  87
  88         uint64_t seq_num;
  89         bool is_urgent;
  90 };
  91
  92 enum urgent_situation {
  93         REPL_URGENT_ON_CREATE = 1,
  94         REPL_URGENT_ON_UPDATE = 2,
  95         REPL_URGENT_ON_DELETE = 4
  96 };
  97
  98
  99 static const struct {
 100         const char *update_name;
 101         enum urgent_situation repl_situation;
 102 } urgent_objects[] = {
 103                 {"nTDSDSA", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 104                 {"crossRef", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 105                 {"attributeSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 106                 {"classSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 107                 {"secret", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 108                 {"rIDManager", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 109                 {NULL, 0}
 110 };
 111
 112 /* Attributes looked for when updating or deleting, to check for a urgent replication needed */
 113 static const char *urgent_attrs[] = {
 114                 "lockoutTime",
 115                 "pwdLastSet",
 116                 "userAccountControl",
 117                 NULL
 118 };
 119
 120
 121 static bool replmd_check_urgent_objectclass(const struct ldb_message_element *objectclass_el,
 122                                         enum urgent_situation situation)
 123 {
 124         unsigned int i, j;
 125         for (i=0; urgent_objects[i].update_name; i++) {
 126
 127                 if ((situation & urgent_objects[i].repl_situation) == 0) {
 128                         continue;
 129                 }
 130
 131                 for (j=0; j<objectclass_el->num_values; j++) {
 132                         const struct ldb_val *v = &objectclass_el->values[j];
 133                         if (ldb_attr_cmp((const char *)v->data, urgent_objects[i].update_name) == 0) {
 134                                 return true;
 135                         }
 136                 }
 137         }
 138         return false;
 139 }
 140
 141 static bool replmd_check_urgent_attribute(const struct ldb_message_element *el)
 142 {
 143         if (ldb_attr_in_list(urgent_attrs, el->name)) {
 144                 return true;
 145         }
 146         return false;
 147 }
 148
 149
 150 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
 151
 152 /*
 153   initialise the module
 154   allocate the private structure and build the list
 155   of partition DNs for use by replmd_notify()
 156  */
 157 static int replmd_init(struct ldb_module *module)
 158 {
 159         struct replmd_private *replmd_private;
 160         struct ldb_context *ldb = ldb_module_get_ctx(module);
 161
 162         replmd_private = talloc_zero(module, struct replmd_private);
 163         if (replmd_private == NULL) {
 164                 ldb_oom(ldb);
 165                 return LDB_ERR_OPERATIONS_ERROR;
 166         }
 167         ldb_module_set_private(module, replmd_private);
 168
 169         return ldb_next_init(module);
 170 }
 171
 172 /*
 173   cleanup our per-transaction contexts
 174  */
 175 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 176 {
 177         talloc_free(replmd_private->la_ctx);
 178         replmd_private->la_list = NULL;
 179         replmd_private->la_ctx = NULL;
 180
 181         talloc_free(replmd_private->bl_ctx);
 182         replmd_private->la_backlinks = NULL;
 183         replmd_private->bl_ctx = NULL;
 184 }
 185
 186
 187 struct la_backlink {
 188         struct la_backlink *next, *prev;
 189         const char *attr_name;
 190         struct GUID forward_guid, target_guid;
 191         bool active;
 192 };
 193
 194 /*
 195   process a backlinks we accumulated during a transaction, adding and
 196   deleting the backlinks from the target objects
 197  */
 198 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl, struct ldb_request *parent)
 199 {
 200         struct ldb_dn *target_dn, *source_dn;
 201         int ret;
 202         struct ldb_context *ldb = ldb_module_get_ctx(module);
 203         struct ldb_message *msg;
 204         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 205         char *dn_string;
 206
 207         /*
 208           - find DN of target
 209           - find DN of source
 210           - construct ldb_message
 211               - either an add or a delete
 212          */
 213         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn, parent);
 214         if (ret != LDB_SUCCESS) {
 215                 DEBUG(2,(__location__ ": WARNING: Failed to find target DN for linked attribute with GUID %s\n",
 216                          GUID_string(bl, &bl->target_guid)));
 217                 return LDB_SUCCESS;
 218         }
 219
 220         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn, parent);
 221         if (ret != LDB_SUCCESS) {
 222                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 223                                        GUID_string(bl, &bl->forward_guid));
 224                 talloc_free(tmp_ctx);
 225                 return ret;
 226         }
 227
 228         msg = ldb_msg_new(tmp_ctx);
 229         if (msg == NULL) {
 230                 ldb_module_oom(module);
 231                 talloc_free(tmp_ctx);
 232                 return LDB_ERR_OPERATIONS_ERROR;
 233         }
 234
 235         /* construct a ldb_message for adding/deleting the backlink */
 236         msg->dn = target_dn;
 237         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 238         if (!dn_string) {
 239                 ldb_module_oom(module);
 240                 talloc_free(tmp_ctx);
 241                 return LDB_ERR_OPERATIONS_ERROR;
 242         }
 243         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 244         if (ret != LDB_SUCCESS) {
 245                 talloc_free(tmp_ctx);
 246                 return ret;
 247         }
 248         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 249
 250         /* a backlink should never be single valued. Unfortunately the
 251            exchange schema has a attribute
 252            msExchBridgeheadedLocalConnectorsDNBL which is single
 253            valued and a backlink. We need to cope with that by
 254            ignoring the single value flag */
 255         msg->elements[0].flags |= LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK;
 256
 257         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE, parent);
 258         if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE && !bl->active) {
 259                 /* we allow LDB_ERR_NO_SUCH_ATTRIBUTE as success to
 260                    cope with possible corruption where the backlink has
 261                    already been removed */
 262                 DEBUG(3,("WARNING: backlink from %s already removed from %s - %s\n",
 263                          ldb_dn_get_linearized(target_dn),
 264                          ldb_dn_get_linearized(source_dn),
 265                          ldb_errstring(ldb)));
 266                 ret = LDB_SUCCESS;
 267         } else if (ret != LDB_SUCCESS) {
 268                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 269                                        bl->active?"add":"remove",
 270                                        ldb_dn_get_linearized(source_dn),
 271                                        ldb_dn_get_linearized(target_dn),
 272                                        ldb_errstring(ldb));
 273                 talloc_free(tmp_ctx);
 274                 return ret;
 275         }
 276         talloc_free(tmp_ctx);
 277         return ret;
 278 }
 279
 280 /*
 281   add a backlink to the list of backlinks to add/delete in the prepare
 282   commit
 283  */
 284 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 285                                struct GUID *forward_guid, struct GUID *target_guid,
 286                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 287 {
 288         const struct dsdb_attribute *target_attr;
 289         struct la_backlink *bl;
 290         struct replmd_private *replmd_private =
 291                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 292
 293         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 294         if (!target_attr) {
 295                 /*
 296                  * windows 2003 has a broken schema where the
 297                  * definition of msDS-IsDomainFor is missing (which is
 298                  * supposed to be the backlink of the
 299                  * msDS-HasDomainNCs attribute
 300                  */
 301                 return LDB_SUCCESS;
 302         }
 303
 304         /* see if its already in the list */
 305         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 306                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 307                     GUID_equal(target_guid, &bl->target_guid) &&
 308                     (target_attr->lDAPDisplayName == bl->attr_name ||
 309                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 310                         break;
 311                 }
 312         }
 313
 314         if (bl) {
 315                 /* we found an existing one */
 316                 if (bl->active == active) {
 317                         return LDB_SUCCESS;
 318                 }
 319                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 320                 talloc_free(bl);
 321                 return LDB_SUCCESS;
 322         }
 323
 324         if (replmd_private->bl_ctx == NULL) {
 325                 replmd_private->bl_ctx = talloc_new(replmd_private);
 326                 if (replmd_private->bl_ctx == NULL) {
 327                         ldb_module_oom(module);
 328                         return LDB_ERR_OPERATIONS_ERROR;
 329                 }
 330         }
 331
 332         /* its a new one */
 333         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 334         if (bl == NULL) {
 335                 ldb_module_oom(module);
 336                 return LDB_ERR_OPERATIONS_ERROR;
 337         }
 338
 339         /* Ensure the schema does not go away before the bl->attr_name is used */
 340         if (!talloc_reference(bl, schema)) {
 341                 talloc_free(bl);
 342                 ldb_module_oom(module);
 343                 return LDB_ERR_OPERATIONS_ERROR;
 344         }
 345
 346         bl->attr_name = target_attr->lDAPDisplayName;
 347         bl->forward_guid = *forward_guid;
 348         bl->target_guid = *target_guid;
 349         bl->active = active;
 350
 351         /* the caller may ask for this backlink to be processed
 352            immediately */
 353         if (immediate) {
 354                 int ret = replmd_process_backlink(module, bl, NULL);
 355                 talloc_free(bl);
 356                 return ret;
 357         }
 358
 359         DLIST_ADD(replmd_private->la_backlinks, bl);
 360
 361         return LDB_SUCCESS;
 362 }
 363
 364
 365 /*
 366  * Callback for most write operations in this module:
 367  *
 368  * notify the repl task that a object has changed. The notifies are
 369  * gathered up in the replmd_private structure then written to the
 370  * @REPLCHANGED object in each partition during the prepare_commit
 371  */
 372 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 373 {
 374         int ret;
 375         struct replmd_replicated_request *ac =
 376                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 377         struct replmd_private *replmd_private =
 378                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 379         struct nc_entry *modified_partition;
 380         struct ldb_control *partition_ctrl;
 381         const struct dsdb_control_current_partition *partition;
 382
 383         struct ldb_control **controls;
 384
 385         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 386
 387         controls = ares->controls;
 388         if (ldb_request_get_control(ac->req,
 389                                     DSDB_CONTROL_CURRENT_PARTITION_OID) == NULL) {
 390                 /*
 391                  * Remove the current partition control from what we pass up
 392                  * the chain if it hasn't been requested manually.
 393                  */
 394                 controls = ldb_controls_except_specified(ares->controls, ares,
 395                                                          partition_ctrl);
 396         }
 397
 398         if (ares->error != LDB_SUCCESS) {
 399                 DEBUG(5,("%s failure. Error is: %s\n", __FUNCTION__, ldb_strerror(ares->error)));
 400                 return ldb_module_done(ac->req, controls,
 401                                         ares->response, ares->error);
 402         }
 403
 404         if (ares->type != LDB_REPLY_DONE) {
 405                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 406                 return ldb_module_done(ac->req, NULL,
 407                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 408         }
 409
 410         if (!partition_ctrl) {
 411                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 412                 return ldb_module_done(ac->req, NULL,
 413                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 414         }
 415
 416         partition = talloc_get_type_abort(partition_ctrl->data,
 417                                     struct dsdb_control_current_partition);
 418
 419         if (ac->seq_num > 0) {
 420                 for (modified_partition = replmd_private->ncs; modified_partition;
 421                      modified_partition = modified_partition->next) {
 422                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 423                                 break;
 424                         }
 425                 }
 426
 427                 if (modified_partition == NULL) {
 428                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 429                         if (!modified_partition) {
 430                                 ldb_oom(ldb_module_get_ctx(ac->module));
 431                                 return ldb_module_done(ac->req, NULL,
 432                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 433                         }
 434                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 435                         if (!modified_partition->dn) {
 436                                 ldb_oom(ldb_module_get_ctx(ac->module));
 437                                 return ldb_module_done(ac->req, NULL,
 438                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 439                         }
 440                         DLIST_ADD(replmd_private->ncs, modified_partition);
 441                 }
 442
 443                 if (ac->seq_num > modified_partition->mod_usn) {
 444                         modified_partition->mod_usn = ac->seq_num;
 445                         if (ac->is_urgent) {
 446                                 modified_partition->mod_usn_urgent = ac->seq_num;
 447                         }
 448                 }
 449         }
 450
 451         if (ac->apply_mode) {
 452                 talloc_free(ares);
 453                 ac->index_current++;
 454
 455                 ret = replmd_replicated_apply_next(ac);
 456                 if (ret != LDB_SUCCESS) {
 457                         return ldb_module_done(ac->req, NULL, NULL, ret);
 458                 }
 459                 return ret;
 460         } else {
 461                 /* free the partition control container here, for the
 462                  * common path.  Other cases will have it cleaned up
 463                  * eventually with the ares */
 464                 talloc_free(partition_ctrl);
 465                 return ldb_module_done(ac->req, controls,
 466                                        ares->response, LDB_SUCCESS);
 467         }
 468 }
 469
 470
 471 /*
 472  * update a @REPLCHANGED record in each partition if there have been
 473  * any writes of replicated data in the partition
 474  */
 475 static int replmd_notify_store(struct ldb_module *module, struct ldb_request *parent)
 476 {
 477         struct replmd_private *replmd_private =
 478                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 479
 480         while (replmd_private->ncs) {
 481                 int ret;
 482                 struct nc_entry *modified_partition = replmd_private->ncs;
 483
 484                 ret = dsdb_module_save_partition_usn(module, modified_partition->dn,
 485                                                      modified_partition->mod_usn,
 486                                                      modified_partition->mod_usn_urgent, parent);
 487                 if (ret != LDB_SUCCESS) {
 488                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 489                                  ldb_dn_get_linearized(modified_partition->dn)));
 490                         return ret;
 491                 }
 492                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 493                 talloc_free(modified_partition);
 494         }
 495
 496         return LDB_SUCCESS;
 497 }
 498
 499
 500 /*
 501   created a replmd_replicated_request context
 502  */
 503 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 504                                                          struct ldb_request *req)
 505 {
 506         struct ldb_context *ldb;
 507         struct replmd_replicated_request *ac;
 508
 509         ldb = ldb_module_get_ctx(module);
 510
 511         ac = talloc_zero(req, struct replmd_replicated_request);
 512         if (ac == NULL) {
 513                 ldb_oom(ldb);
 514                 return NULL;
 515         }
 516
 517         ac->module = module;
 518         ac->req = req;
 519
 520         ac->schema = dsdb_get_schema(ldb, ac);
 521         if (!ac->schema) {
 522                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 523                               "replmd_modify: no dsdb_schema loaded");
 524                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 525                 return NULL;
 526         }
 527
 528         return ac;
 529 }
 530
 531 /*
 532   add a time element to a record
 533 */
 534 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 535 {
 536         struct ldb_message_element *el;
 537         char *s;
 538         int ret;
 539
 540         if (ldb_msg_find_element(msg, attr) != NULL) {
 541                 return LDB_SUCCESS;
 542         }
 543
 544         s = ldb_timestring(msg, t);
 545         if (s == NULL) {
 546                 return LDB_ERR_OPERATIONS_ERROR;
 547         }
 548
 549         ret = ldb_msg_add_string(msg, attr, s);
 550         if (ret != LDB_SUCCESS) {
 551                 return ret;
 552         }
 553
 554         el = ldb_msg_find_element(msg, attr);
 555         /* always set as replace. This works because on add ops, the flag
 556            is ignored */
 557         el->flags = LDB_FLAG_MOD_REPLACE;
 558
 559         return LDB_SUCCESS;
 560 }
 561
 562 /*
 563   add a uint64_t element to a record
 564 */
 565 static int add_uint64_element(struct ldb_context *ldb, struct ldb_message *msg,
 566                               const char *attr, uint64_t v)
 567 {
 568         struct ldb_message_element *el;
 569         int ret;
 570
 571         if (ldb_msg_find_element(msg, attr) != NULL) {
 572                 return LDB_SUCCESS;
 573         }
 574
 575         ret = samdb_msg_add_uint64(ldb, msg, msg, attr, v);
 576         if (ret != LDB_SUCCESS) {
 577                 return ret;
 578         }
 579
 580         el = ldb_msg_find_element(msg, attr);
 581         /* always set as replace. This works because on add ops, the flag
 582            is ignored */
 583         el->flags = LDB_FLAG_MOD_REPLACE;
 584
 585         return LDB_SUCCESS;
 586 }
 587
 588 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 589                                                    const struct replPropertyMetaData1 *m2,
 590                                                    const uint32_t *rdn_attid)
 591 {
 592         if (m1->attid == m2->attid) {
 593                 return 0;
 594         }
 595
 596         /*
 597          * the rdn attribute should be at the end!
 598          * so we need to return a value greater than zero
 599          * which means m1 is greater than m2
 600          */
 601         if (m1->attid == *rdn_attid) {
 602                 return 1;
 603         }
 604
 605         /*
 606          * the rdn attribute should be at the end!
 607          * so we need to return a value less than zero
 608          * which means m2 is greater than m1
 609          */
 610         if (m2->attid == *rdn_attid) {
 611                 return -1;
 612         }
 613
 614         return m1->attid > m2->attid ? 1 : -1;
 615 }
 616
 617 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 618                                                 const struct dsdb_schema *schema,
 619                                                 struct ldb_dn *dn)
 620 {
 621         const char *rdn_name;
 622         const struct dsdb_attribute *rdn_sa;
 623
 624         rdn_name = ldb_dn_get_rdn_name(dn);
 625         if (!rdn_name) {
 626                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 627                 return LDB_ERR_OPERATIONS_ERROR;
 628         }
 629
 630         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 631         if (rdn_sa == NULL) {
 632                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 633                 return LDB_ERR_OPERATIONS_ERROR;
 634         }
 635
 636         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 637                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 638
 639         LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
 640
 641         return LDB_SUCCESS;
 642 }
 643
 644 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 645                                                  const struct ldb_message_element *e2,
 646                                                  const struct dsdb_schema *schema)
 647 {
 648         const struct dsdb_attribute *a1;
 649         const struct dsdb_attribute *a2;
 650
 651         /*
 652          * TODO: make this faster by caching the dsdb_attribute pointer
 653          *       on the ldb_messag_element
 654          */
 655
 656         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 657         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 658
 659         /*
 660          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 661          *       in the schema
 662          */
 663         if (!a1 || !a2) {
 664                 return strcasecmp(e1->name, e2->name);
 665         }
 666         if (a1->attributeID_id == a2->attributeID_id) {
 667                 return 0;
 668         }
 669         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 670 }
 671
 672 static void replmd_ldb_message_sort(struct ldb_message *msg,
 673                                     const struct dsdb_schema *schema)
 674 {
 675         LDB_TYPESAFE_QSORT(msg->elements, msg->num_elements, schema, replmd_ldb_message_element_attid_sort);
 676 }
 677
 678 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 679                                const struct GUID *invocation_id, uint64_t seq_num,
 680                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 681
 682
 683 /*
 684   fix up linked attributes in replmd_add.
 685   This involves setting up the right meta-data in extended DN
 686   components, and creating backlinks to the object
 687  */
 688 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 689                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 690                              struct GUID *guid, const struct dsdb_attribute *sa, struct ldb_request *parent)
 691 {
 692         unsigned int i;
 693         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 694         struct ldb_context *ldb = ldb_module_get_ctx(module);
 695
 696         /* We will take a reference to the schema in replmd_add_backlink */
 697         const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
 698         NTTIME now;
 699
 700         unix_to_nt_time(&now, t);
 701
 702         for (i=0; i<el->num_values; i++) {
 703                 struct ldb_val *v = &el->values[i];
 704                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 705                 struct GUID target_guid;
 706                 NTSTATUS status;
 707                 int ret;
 708
 709                 /* note that the DN already has the extended
 710                    components from the extended_dn_store module */
 711                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 712                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 713                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid, parent);
 714                         if (ret != LDB_SUCCESS) {
 715                                 talloc_free(tmp_ctx);
 716                                 return ret;
 717                         }
 718                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 719                         if (ret != LDB_SUCCESS) {
 720                                 talloc_free(tmp_ctx);
 721                                 return ret;
 722                         }
 723                 }
 724
 725                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 726                                           seq_num, seq_num, now, 0, false);
 727                 if (ret != LDB_SUCCESS) {
 728                         talloc_free(tmp_ctx);
 729                         return ret;
 730                 }
 731
 732                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 733                 if (ret != LDB_SUCCESS) {
 734                         talloc_free(tmp_ctx);
 735                         return ret;
 736                 }
 737         }
 738
 739         talloc_free(tmp_ctx);
 740         return LDB_SUCCESS;
 741 }
 742
 743
 744 /*
 745   intercept add requests
 746  */
 747 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 748 {
 749         struct ldb_context *ldb;
 750         struct ldb_control *control;
 751         struct replmd_replicated_request *ac;
 752         enum ndr_err_code ndr_err;
 753         struct ldb_request *down_req;
 754         struct ldb_message *msg;
 755         const DATA_BLOB *guid_blob;
 756         struct GUID guid;
 757         struct replPropertyMetaDataBlob nmd;
 758         struct ldb_val nmd_value;
 759         const struct GUID *our_invocation_id;
 760         time_t t = time(NULL);
 761         NTTIME now;
 762         char *time_str;
 763         int ret;
 764         unsigned int i;
 765         unsigned int functional_level;
 766         uint32_t ni=0;
 767         bool allow_add_guid = false;
 768         bool remove_current_guid = false;
 769         bool is_urgent = false;
 770         struct ldb_message_element *objectclass_el;
 771
 772         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 773         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 774         if (control) {
 775                 allow_add_guid = true;
 776         }
 777
 778         /* do not manipulate our control entries */
 779         if (ldb_dn_is_special(req->op.add.message->dn)) {
 780                 return ldb_next_request(module, req);
 781         }
 782
 783         ldb = ldb_module_get_ctx(module);
 784
 785         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 786
 787         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 788         if (guid_blob != NULL) {
 789                 if (!allow_add_guid) {
 790                         ldb_set_errstring(ldb,
 791                                           "replmd_add: it's not allowed to add an object with objectGUID!");
 792                         return LDB_ERR_UNWILLING_TO_PERFORM;
 793                 } else {
 794                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 795                         if (!NT_STATUS_IS_OK(status)) {
 796                                 ldb_set_errstring(ldb,
 797                                                   "replmd_add: Unable to parse the 'objectGUID' as a GUID!");
 798                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 799                         }
 800                         /* we remove this attribute as it can be a string and
 801                          * will not be treated correctly and then we will re-add
 802                          * it later on in the good format */
 803                         remove_current_guid = true;
 804                 }
 805         } else {
 806                 /* a new GUID */
 807                 guid = GUID_random();
 808         }
 809
 810         ac = replmd_ctx_init(module, req);
 811         if (ac == NULL) {
 812                 return ldb_module_oom(module);
 813         }
 814
 815         functional_level = dsdb_functional_level(ldb);
 816
 817         /* Get a sequence number from the backend */
 818         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 819         if (ret != LDB_SUCCESS) {
 820                 talloc_free(ac);
 821                 return ret;
 822         }
 823
 824         /* get our invocationId */
 825         our_invocation_id = samdb_ntds_invocation_id(ldb);
 826         if (!our_invocation_id) {
 827                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 828                               "replmd_add: unable to find invocationId\n");
 829                 talloc_free(ac);
 830                 return LDB_ERR_OPERATIONS_ERROR;
 831         }
 832
 833         /* we have to copy the message as the caller might have it as a const */
 834         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 835         if (msg == NULL) {
 836                 ldb_oom(ldb);
 837                 talloc_free(ac);
 838                 return LDB_ERR_OPERATIONS_ERROR;
 839         }
 840
 841         /* generated times */
 842         unix_to_nt_time(&now, t);
 843         time_str = ldb_timestring(msg, t);
 844         if (!time_str) {
 845                 ldb_oom(ldb);
 846                 talloc_free(ac);
 847                 return LDB_ERR_OPERATIONS_ERROR;
 848         }
 849         if (remove_current_guid) {
 850                 ldb_msg_remove_attr(msg,"objectGUID");
 851         }
 852
 853         /*
 854          * remove autogenerated attributes
 855          */
 856         ldb_msg_remove_attr(msg, "whenCreated");
 857         ldb_msg_remove_attr(msg, "whenChanged");
 858         ldb_msg_remove_attr(msg, "uSNCreated");
 859         ldb_msg_remove_attr(msg, "uSNChanged");
 860         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 861
 862         /*
 863          * readd replicated attributes
 864          */
 865         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 866         if (ret != LDB_SUCCESS) {
 867                 ldb_oom(ldb);
 868                 talloc_free(ac);
 869                 return ret;
 870         }
 871
 872         /* build the replication meta_data */
 873         ZERO_STRUCT(nmd);
 874         nmd.version             = 1;
 875         nmd.ctr.ctr1.count      = msg->num_elements;
 876         nmd.ctr.ctr1.array      = talloc_array(msg,
 877                                                struct replPropertyMetaData1,
 878                                                nmd.ctr.ctr1.count);
 879         if (!nmd.ctr.ctr1.array) {
 880                 ldb_oom(ldb);
 881                 talloc_free(ac);
 882                 return LDB_ERR_OPERATIONS_ERROR;
 883         }
 884
 885         for (i=0; i < msg->num_elements; i++) {
 886                 struct ldb_message_element *e = &msg->elements[i];
 887                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 888                 const struct dsdb_attribute *sa;
 889
 890                 if (e->name[0] == '@') continue;
 891
 892                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 893                 if (!sa) {
 894                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 895                                       "replmd_add: attribute '%s' not defined in schema\n",
 896                                       e->name);
 897                         talloc_free(ac);
 898                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 899                 }
 900
 901                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 902                         /* if the attribute is not replicated (0x00000001)
 903                          * or constructed (0x00000004) it has no metadata
 904                          */
 905                         continue;
 906                 }
 907
 908                 if (sa->linkID != 0 && functional_level > DS_DOMAIN_FUNCTION_2000) {
 909                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa, req);
 910                         if (ret != LDB_SUCCESS) {
 911                                 talloc_free(ac);
 912                                 return ret;
 913                         }
 914                         /* linked attributes are not stored in
 915                            replPropertyMetaData in FL above w2k */
 916                         continue;
 917                 }
 918
 919                 m->attid                        = sa->attributeID_id;
 920                 m->version                      = 1;
 921                 if (m->attid == 0x20030) {
 922                         const struct ldb_val *rdn_val = ldb_dn_get_rdn_val(msg->dn);
 923                         const char* rdn;
 924
 925                         if (rdn_val == NULL) {
 926                                 ldb_oom(ldb);
 927                                 talloc_free(ac);
 928                                 return LDB_ERR_OPERATIONS_ERROR;
 929                         }
 930
 931                         rdn = (const char*)rdn_val->data;
 932                         if (strcmp(rdn, "Deleted Objects") == 0) {
 933                                 /*
 934                                  * Set the originating_change_time to 29/12/9999 at 23:59:59
 935                                  * as specified in MS-ADTS 7.1.1.4.2 Deleted Objects Container
 936                                  */
 937                                 NTTIME deleted_obj_ts;
 938
 939                                 unix_to_nt_time(&deleted_obj_ts, DELETED_OBJECT_CONTAINER_CHANGE_TIME);
 940                                 m->originating_change_time      = deleted_obj_ts;
 941                         } else {
 942                                 m->originating_change_time      = now;
 943                         }
 944                 } else {
 945                         m->originating_change_time      = now;
 946                 }
 947                 m->originating_invocation_id    = *our_invocation_id;
 948                 m->originating_usn              = ac->seq_num;
 949                 m->local_usn                    = ac->seq_num;
 950                 ni++;
 951         }
 952
 953         /* fix meta data count */
 954         nmd.ctr.ctr1.count = ni;
 955
 956         /*
 957          * sort meta data array, and move the rdn attribute entry to the end
 958          */
 959         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 960         if (ret != LDB_SUCCESS) {
 961                 talloc_free(ac);
 962                 return ret;
 963         }
 964
 965         /* generated NDR encoded values */
 966         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 967                                        &nmd,
 968                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 969         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 970                 ldb_oom(ldb);
 971                 talloc_free(ac);
 972                 return LDB_ERR_OPERATIONS_ERROR;
 973         }
 974
 975         /*
 976          * add the autogenerated values
 977          */
 978         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 979         if (ret != LDB_SUCCESS) {
 980                 ldb_oom(ldb);
 981                 talloc_free(ac);
 982                 return ret;
 983         }
 984         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 985         if (ret != LDB_SUCCESS) {
 986                 ldb_oom(ldb);
 987                 talloc_free(ac);
 988                 return ret;
 989         }
 990         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 991         if (ret != LDB_SUCCESS) {
 992                 ldb_oom(ldb);
 993                 talloc_free(ac);
 994                 return ret;
 995         }
 996         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 997         if (ret != LDB_SUCCESS) {
 998                 ldb_oom(ldb);
 999                 talloc_free(ac);
1000                 return ret;
1001         }
1002         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
1003         if (ret != LDB_SUCCESS) {
1004                 ldb_oom(ldb);
1005                 talloc_free(ac);
1006                 return ret;
1007         }
1008
1009         /*
1010          * sort the attributes by attid before storing the object
1011          */
1012         replmd_ldb_message_sort(msg, ac->schema);
1013
1014         objectclass_el = ldb_msg_find_element(msg, "objectClass");
1015         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
1016                                                         REPL_URGENT_ON_CREATE);
1017
1018         ac->is_urgent = is_urgent;
1019         ret = ldb_build_add_req(&down_req, ldb, ac,
1020                                 msg,
1021                                 req->controls,
1022                                 ac, replmd_op_callback,
1023                                 req);
1024
1025         LDB_REQ_SET_LOCATION(down_req);
1026         if (ret != LDB_SUCCESS) {
1027                 talloc_free(ac);
1028                 return ret;
1029         }
1030
1031         /* current partition control is needed by "replmd_op_callback" */
1032         if (ldb_request_get_control(req, DSDB_CONTROL_CURRENT_PARTITION_OID) == NULL) {
1033                 ret = ldb_request_add_control(down_req,
1034                                               DSDB_CONTROL_CURRENT_PARTITION_OID,
1035                                               false, NULL);
1036                 if (ret != LDB_SUCCESS) {
1037                         talloc_free(ac);
1038                         return ret;
1039                 }
1040         }
1041
1042         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
1043                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
1044                 if (ret != LDB_SUCCESS) {
1045                         talloc_free(ac);
1046                         return ret;
1047                 }
1048         }
1049
1050         /* mark the control done */
1051         if (control) {
1052                 control->critical = 0;
1053         }
1054
1055         /* go on with the call chain */
1056         return ldb_next_request(module, down_req);
1057 }
1058
1059
1060 /*
1061  * update the replPropertyMetaData for one element
1062  */
1063 static int replmd_update_rpmd_element(struct ldb_context *ldb,
1064                                       struct ldb_message *msg,
1065                                       struct ldb_message_element *el,
1066                                       struct ldb_message_element *old_el,
1067                                       struct replPropertyMetaDataBlob *omd,
1068                                       const struct dsdb_schema *schema,
1069                                       uint64_t *seq_num,
1070                                       const struct GUID *our_invocation_id,
1071                                       NTTIME now,
1072                                       struct ldb_request *req)
1073 {
1074         uint32_t i;
1075         const struct dsdb_attribute *a;
1076         struct replPropertyMetaData1 *md1;
1077
1078         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1079         if (a == NULL) {
1080                 if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID)) {
1081                         /* allow this to make it possible for dbcheck
1082                            to remove bad attributes */
1083                         return LDB_SUCCESS;
1084                 }
1085
1086                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1087                          el->name));
1088                 return LDB_ERR_OPERATIONS_ERROR;
1089         }
1090
1091         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1092                 return LDB_SUCCESS;
1093         }
1094
1095         /* if the attribute's value haven't changed then return LDB_SUCCESS
1096          * Unless we have the provision control or if the attribute is
1097          * interSiteTopologyGenerator as this page explain: http://support.microsoft.com/kb/224815
1098          * this attribute is periodicaly written by the DC responsible for the intersite generation
1099          * in a given site
1100          */
1101         if (old_el != NULL && ldb_msg_element_compare(el, old_el) == 0) {
1102                 if (strcmp(el->name, "interSiteTopologyGenerator") != 0 &&
1103                     !ldb_request_get_control(req, LDB_CONTROL_PROVISION_OID)) {
1104                         /*
1105                          * allow this to make it possible for dbcheck
1106                          * to rebuild broken metadata
1107                          */
1108                         return LDB_SUCCESS;
1109                 }
1110         }
1111
1112         for (i=0; i<omd->ctr.ctr1.count; i++) {
1113                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1114         }
1115
1116         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1117                 /* linked attributes are not stored in
1118                    replPropertyMetaData in FL above w2k, but we do
1119                    raise the seqnum for the object  */
1120                 if (*seq_num == 0 &&
1121                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1122                         return LDB_ERR_OPERATIONS_ERROR;
1123                 }
1124                 return LDB_SUCCESS;
1125         }
1126
1127         if (i == omd->ctr.ctr1.count) {
1128                 /* we need to add a new one */
1129                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1130                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1131                 if (omd->ctr.ctr1.array == NULL) {
1132                         ldb_oom(ldb);
1133                         return LDB_ERR_OPERATIONS_ERROR;
1134                 }
1135                 omd->ctr.ctr1.count++;
1136                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1137         }
1138
1139         /* Get a new sequence number from the backend. We only do this
1140          * if we have a change that requires a new
1141          * replPropertyMetaData element
1142          */
1143         if (*seq_num == 0) {
1144                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1145                 if (ret != LDB_SUCCESS) {
1146                         return LDB_ERR_OPERATIONS_ERROR;
1147                 }
1148         }
1149
1150         md1 = &omd->ctr.ctr1.array[i];
1151         md1->version++;
1152         md1->attid                     = a->attributeID_id;
1153         if (md1->attid == 0x20030) {
1154                 const struct ldb_val *rdn_val = ldb_dn_get_rdn_val(msg->dn);
1155                 const char* rdn;
1156
1157                 if (rdn_val == NULL) {
1158                         ldb_oom(ldb);
1159                         return LDB_ERR_OPERATIONS_ERROR;
1160                 }
1161
1162                 rdn = (const char*)rdn_val->data;
1163                 if (strcmp(rdn, "Deleted Objects") == 0) {
1164                         /*
1165                          * Set the originating_change_time to 29/12/9999 at 23:59:59
1166                          * as specified in MS-ADTS 7.1.1.4.2 Deleted Objects Container
1167                          */
1168                         NTTIME deleted_obj_ts;
1169
1170                         unix_to_nt_time(&deleted_obj_ts, DELETED_OBJECT_CONTAINER_CHANGE_TIME);
1171                         md1->originating_change_time    = deleted_obj_ts;
1172                 } else {
1173                         md1->originating_change_time    = now;
1174                 }
1175         } else {
1176                 md1->originating_change_time    = now;
1177         }
1178         md1->originating_invocation_id = *our_invocation_id;
1179         md1->originating_usn           = *seq_num;
1180         md1->local_usn                 = *seq_num;
1181
1182         return LDB_SUCCESS;
1183 }
1184
1185 static uint64_t find_max_local_usn(struct replPropertyMetaDataBlob omd)
1186 {
1187         uint32_t count = omd.ctr.ctr1.count;
1188         uint64_t max = 0;
1189         uint32_t i;
1190         for (i=0; i < count; i++) {
1191                 struct replPropertyMetaData1 m = omd.ctr.ctr1.array[i];
1192                 if (max < m.local_usn) {
1193                         max = m.local_usn;
1194                 }
1195         }
1196         return max;
1197 }
1198
1199 /*
1200  * update the replPropertyMetaData object each time we modify an
1201  * object. This is needed for DRS replication, as the merge on the
1202  * client is based on this object
1203  */
1204 static int replmd_update_rpmd(struct ldb_module *module,
1205                               const struct dsdb_schema *schema,
1206                               struct ldb_request *req,
1207                               const char * const *rename_attrs,
1208                               struct ldb_message *msg, uint64_t *seq_num,
1209                               time_t t,
1210                               bool *is_urgent, bool *rodc)
1211 {
1212         const struct ldb_val *omd_value;
1213         enum ndr_err_code ndr_err;
1214         struct replPropertyMetaDataBlob omd;
1215         unsigned int i;
1216         NTTIME now;
1217         const struct GUID *our_invocation_id;
1218         int ret;
1219         const char * const *attrs = NULL;
1220         const char * const attrs1[] = { "replPropertyMetaData", "*", NULL };
1221         const char * const attrs2[] = { "uSNChanged", "objectClass", "instanceType", NULL };
1222         struct ldb_result *res;
1223         struct ldb_context *ldb;
1224         struct ldb_message_element *objectclass_el;
1225         enum urgent_situation situation;
1226         bool rmd_is_provided;
1227
1228         if (rename_attrs) {
1229                 attrs = rename_attrs;
1230         } else {
1231                 attrs = attrs1;
1232         }
1233
1234         ldb = ldb_module_get_ctx(module);
1235
1236         our_invocation_id = samdb_ntds_invocation_id(ldb);
1237         if (!our_invocation_id) {
1238                 /* this happens during an initial vampire while
1239                    updating the schema */
1240                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1241                 return LDB_SUCCESS;
1242         }
1243
1244         unix_to_nt_time(&now, t);
1245
1246         if (ldb_request_get_control(req, DSDB_CONTROL_CHANGEREPLMETADATA_OID)) {
1247                 rmd_is_provided = true;
1248         } else {
1249                 rmd_is_provided = false;
1250         }
1251
1252         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1253          * otherwise we consider we are updating */
1254         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1255                 situation = REPL_URGENT_ON_DELETE;
1256         } else if (rename_attrs) {
1257                 situation = REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE;
1258         } else {
1259                 situation = REPL_URGENT_ON_UPDATE;
1260         }
1261
1262         if (rmd_is_provided) {
1263                 /* In this case the change_replmetadata control was supplied */
1264                 /* We check that it's the only attribute that is provided
1265                  * (it's a rare case so it's better to keep the code simplier)
1266                  * We also check that the highest local_usn is bigger than
1267                  * uSNChanged. */
1268                 uint64_t db_seq;
1269                 if( msg->num_elements != 1 ||
1270                         strncmp(msg->elements[0].name,
1271                                 "replPropertyMetaData", 20) ) {
1272                         DEBUG(0,(__location__ ": changereplmetada control called without "\
1273                                 "a specified replPropertyMetaData attribute or with others\n"));
1274                         return LDB_ERR_OPERATIONS_ERROR;
1275                 }
1276                 if (situation != REPL_URGENT_ON_UPDATE) {
1277                         DEBUG(0,(__location__ ": changereplmetada control can't be called when deleting an object\n"));
1278                         return LDB_ERR_OPERATIONS_ERROR;
1279                 }
1280                 omd_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
1281                 if (!omd_value) {
1282                         DEBUG(0,(__location__ ": replPropertyMetaData was not specified for Object %s\n",
1283                                  ldb_dn_get_linearized(msg->dn)));
1284                         return LDB_ERR_OPERATIONS_ERROR;
1285                 }
1286                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1287                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1288                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1289                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1290                                  ldb_dn_get_linearized(msg->dn)));
1291                         return LDB_ERR_OPERATIONS_ERROR;
1292                 }
1293                 *seq_num = find_max_local_usn(omd);
1294
1295                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs2,
1296                                             DSDB_FLAG_NEXT_MODULE |
1297                                             DSDB_SEARCH_SHOW_RECYCLED |
1298                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1299                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1300                                             DSDB_SEARCH_REVEAL_INTERNALS, req);
1301
1302                 if (ret != LDB_SUCCESS) {
1303                         return ret;
1304                 }
1305
1306                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1307                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1308                                                                 situation)) {
1309                         *is_urgent = true;
1310                 }
1311
1312                 db_seq = ldb_msg_find_attr_as_uint64(res->msgs[0], "uSNChanged", 0);
1313                 if (*seq_num <= db_seq) {
1314                         DEBUG(0,(__location__ ": changereplmetada control provided but max(local_usn)"\
1315                                               " is less or equal to uSNChanged (max = %lld uSNChanged = %lld)\n",
1316                                  (long long)*seq_num, (long long)db_seq));
1317                         return LDB_ERR_OPERATIONS_ERROR;
1318                 }
1319
1320         } else {
1321                 /* search for the existing replPropertyMetaDataBlob. We need
1322                  * to use REVEAL and ask for DNs in storage format to support
1323                  * the check for values being the same in
1324                  * replmd_update_rpmd_element()
1325                  */
1326                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
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                 if (ret != LDB_SUCCESS) {
1333                         return ret;
1334                 }
1335
1336                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1337                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1338                                                                 situation)) {
1339                         *is_urgent = true;
1340                 }
1341
1342                 omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1343                 if (!omd_value) {
1344                         DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1345                                  ldb_dn_get_linearized(msg->dn)));
1346                         return LDB_ERR_OPERATIONS_ERROR;
1347                 }
1348
1349                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1350                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1351                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1352                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1353                                  ldb_dn_get_linearized(msg->dn)));
1354                         return LDB_ERR_OPERATIONS_ERROR;
1355                 }
1356
1357                 if (omd.version != 1) {
1358                         DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1359                                  omd.version, ldb_dn_get_linearized(msg->dn)));
1360                         return LDB_ERR_OPERATIONS_ERROR;
1361                 }
1362
1363                 for (i=0; i<msg->num_elements; i++) {
1364                         struct ldb_message_element *old_el;
1365                         old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1366                         ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1367                                                          our_invocation_id, now, req);
1368                         if (ret != LDB_SUCCESS) {
1369                                 return ret;
1370                         }
1371
1372                         if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1373                                 *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1374                         }
1375
1376                 }
1377         }
1378         /*
1379          * replmd_update_rpmd_element has done an update if the
1380          * seq_num is set
1381          */
1382         if (*seq_num != 0) {
1383                 struct ldb_val *md_value;
1384                 struct ldb_message_element *el;
1385
1386                 /*if we are RODC and this is a DRSR update then its ok*/
1387                 if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
1388                         unsigned instanceType;
1389
1390                         ret = samdb_rodc(ldb, rodc);
1391                         if (ret != LDB_SUCCESS) {
1392                                 DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
1393                         } else if (*rodc) {
1394                                 ldb_set_errstring(ldb, "RODC modify is forbidden!");
1395                                 return LDB_ERR_REFERRAL;
1396                         }
1397
1398                         instanceType = ldb_msg_find_attr_as_uint(res->msgs[0], "instanceType", INSTANCE_TYPE_WRITE);
1399                         if (!(instanceType & INSTANCE_TYPE_WRITE)) {
1400                                 return ldb_error(ldb, LDB_ERR_UNWILLING_TO_PERFORM,
1401                                                  "cannot change replicated attribute on partial replica");
1402                         }
1403                 }
1404
1405                 md_value = talloc(msg, struct ldb_val);
1406                 if (md_value == NULL) {
1407                         ldb_oom(ldb);
1408                         return LDB_ERR_OPERATIONS_ERROR;
1409                 }
1410
1411                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1412                 if (ret != LDB_SUCCESS) {
1413                         return ret;
1414                 }
1415
1416                 ndr_err = ndr_push_struct_blob(md_value, msg, &omd,
1417                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1418                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1419                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1420                                  ldb_dn_get_linearized(msg->dn)));
1421                         return LDB_ERR_OPERATIONS_ERROR;
1422                 }
1423
1424                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1425                 if (ret != LDB_SUCCESS) {
1426                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1427                                  ldb_dn_get_linearized(msg->dn)));
1428                         return ret;
1429                 }
1430
1431                 el->num_values = 1;
1432                 el->values = md_value;
1433         }
1434
1435         return LDB_SUCCESS;
1436 }
1437
1438 struct parsed_dn {
1439         struct dsdb_dn *dsdb_dn;
1440         struct GUID *guid;
1441         struct ldb_val *v;
1442 };
1443
1444 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1445 {
1446         return GUID_compare(pdn1->guid, pdn2->guid);
1447 }
1448
1449 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn,
1450                                         unsigned int count, struct GUID *guid,
1451                                         struct ldb_dn *dn)
1452 {
1453         struct parsed_dn *ret;
1454         unsigned int i;
1455         if (dn && GUID_all_zero(guid)) {
1456                 /* when updating a link using DRS, we sometimes get a
1457                    NULL GUID. We then need to try and match by DN */
1458                 for (i=0; i<count; i++) {
1459                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1460                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1461                                 return &pdn[i];
1462                         }
1463                 }
1464                 return NULL;
1465         }
1466         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1467         return ret;
1468 }
1469
1470 /*
1471   get a series of message element values as an array of DNs and GUIDs
1472   the result is sorted by GUID
1473  */
1474 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1475                           struct ldb_message_element *el, struct parsed_dn **pdn,
1476                           const char *ldap_oid, struct ldb_request *parent)
1477 {
1478         unsigned int i;
1479         struct ldb_context *ldb = ldb_module_get_ctx(module);
1480
1481         if (el == NULL) {
1482                 *pdn = NULL;
1483                 return LDB_SUCCESS;
1484         }
1485
1486         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1487         if (!*pdn) {
1488                 ldb_module_oom(module);
1489                 return LDB_ERR_OPERATIONS_ERROR;
1490         }
1491
1492         for (i=0; i<el->num_values; i++) {
1493                 struct ldb_val *v = &el->values[i];
1494                 NTSTATUS status;
1495                 struct ldb_dn *dn;
1496                 struct parsed_dn *p;
1497
1498                 p = &(*pdn)[i];
1499
1500                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1501                 if (p->dsdb_dn == NULL) {
1502                         return LDB_ERR_INVALID_DN_SYNTAX;
1503                 }
1504
1505                 dn = p->dsdb_dn->dn;
1506
1507                 p->guid = talloc(*pdn, struct GUID);
1508                 if (p->guid == NULL) {
1509                         ldb_module_oom(module);
1510                         return LDB_ERR_OPERATIONS_ERROR;
1511                 }
1512
1513                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1514                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1515                         /* we got a DN without a GUID - go find the GUID */
1516                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid, parent);
1517                         if (ret != LDB_SUCCESS) {
1518                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1519                                                        ldb_dn_get_linearized(dn));
1520                                 if (ret == LDB_ERR_NO_SUCH_OBJECT &&
1521                                     LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE &&
1522                                     ldb_attr_cmp(el->name, "member") == 0) {
1523                                         return LDB_ERR_UNWILLING_TO_PERFORM;
1524                                 }
1525                                 return ret;
1526                         }
1527                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1528                         if (ret != LDB_SUCCESS) {
1529                                 return ret;
1530                         }
1531                 } else if (!NT_STATUS_IS_OK(status)) {
1532                         return LDB_ERR_OPERATIONS_ERROR;
1533                 }
1534
1535                 /* keep a pointer to the original ldb_val */
1536                 p->v = v;
1537         }
1538
1539         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1540
1541         return LDB_SUCCESS;
1542 }
1543
1544 /*
1545   build a new extended DN, including all meta data fields
1546
1547   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1548   RMD_ADDTIME         = originating_add_time
1549   RMD_INVOCID         = originating_invocation_id
1550   RMD_CHANGETIME      = originating_change_time
1551   RMD_ORIGINATING_USN = originating_usn
1552   RMD_LOCAL_USN       = local_usn
1553   RMD_VERSION         = version
1554  */
1555 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1556                                const struct GUID *invocation_id, uint64_t seq_num,
1557                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1558 {
1559         struct ldb_dn *dn = dsdb_dn->dn;
1560         const char *tstring, *usn_string, *flags_string;
1561         struct ldb_val tval;
1562         struct ldb_val iid;
1563         struct ldb_val usnv, local_usnv;
1564         struct ldb_val vers, flagsv;
1565         NTSTATUS status;
1566         int ret;
1567         const char *dnstring;
1568         char *vstring;
1569         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1570
1571         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1572         if (!tstring) {
1573                 return LDB_ERR_OPERATIONS_ERROR;
1574         }
1575         tval = data_blob_string_const(tstring);
1576
1577         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1578         if (!usn_string) {
1579                 return LDB_ERR_OPERATIONS_ERROR;
1580         }
1581         usnv = data_blob_string_const(usn_string);
1582
1583         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1584         if (!usn_string) {
1585                 return LDB_ERR_OPERATIONS_ERROR;
1586         }
1587         local_usnv = data_blob_string_const(usn_string);
1588
1589         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1590         if (!vstring) {
1591                 return LDB_ERR_OPERATIONS_ERROR;
1592         }
1593         vers = data_blob_string_const(vstring);
1594
1595         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1596         if (!NT_STATUS_IS_OK(status)) {
1597                 return LDB_ERR_OPERATIONS_ERROR;
1598         }
1599
1600         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1601         if (!flags_string) {
1602                 return LDB_ERR_OPERATIONS_ERROR;
1603         }
1604         flagsv = data_blob_string_const(flags_string);
1605
1606         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1607         if (ret != LDB_SUCCESS) return ret;
1608         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1609         if (ret != LDB_SUCCESS) return ret;
1610         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1611         if (ret != LDB_SUCCESS) return ret;
1612         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1613         if (ret != LDB_SUCCESS) return ret;
1614         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1615         if (ret != LDB_SUCCESS) return ret;
1616         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1617         if (ret != LDB_SUCCESS) return ret;
1618         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1619         if (ret != LDB_SUCCESS) return ret;
1620
1621         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1622         if (dnstring == NULL) {
1623                 return LDB_ERR_OPERATIONS_ERROR;
1624         }
1625         *v = data_blob_string_const(dnstring);
1626
1627         return LDB_SUCCESS;
1628 }
1629
1630 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1631                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1632                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1633                                 uint32_t version, bool deleted);
1634
1635 /*
1636   check if any links need upgrading from w2k format
1637
1638   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.
1639  */
1640 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1641 {
1642         uint32_t i;
1643         for (i=0; i<count; i++) {
1644                 NTSTATUS status;
1645                 uint32_t version;
1646                 int ret;
1647
1648                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1649                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1650                         continue;
1651                 }
1652
1653                 /* it's an old one that needs upgrading */
1654                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1655                                            1, 1, 0, 0, false);
1656                 if (ret != LDB_SUCCESS) {
1657                         return ret;
1658                 }
1659         }
1660         return LDB_SUCCESS;
1661 }
1662
1663 /*
1664   update an extended DN, including all meta data fields
1665
1666   see replmd_build_la_val for value names
1667  */
1668 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1669                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1670                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1671                                 uint32_t version, bool deleted)
1672 {
1673         struct ldb_dn *dn = dsdb_dn->dn;
1674         const char *tstring, *usn_string, *flags_string;
1675         struct ldb_val tval;
1676         struct ldb_val iid;
1677         struct ldb_val usnv, local_usnv;
1678         struct ldb_val vers, flagsv;
1679         const struct ldb_val *old_addtime;
1680         uint32_t old_version;
1681         NTSTATUS status;
1682         int ret;
1683         const char *dnstring;
1684         char *vstring;
1685         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1686
1687         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1688         if (!tstring) {
1689                 return LDB_ERR_OPERATIONS_ERROR;
1690         }
1691         tval = data_blob_string_const(tstring);
1692
1693         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1694         if (!usn_string) {
1695                 return LDB_ERR_OPERATIONS_ERROR;
1696         }
1697         usnv = data_blob_string_const(usn_string);
1698
1699         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1700         if (!usn_string) {
1701                 return LDB_ERR_OPERATIONS_ERROR;
1702         }
1703         local_usnv = data_blob_string_const(usn_string);
1704
1705         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1706         if (!NT_STATUS_IS_OK(status)) {
1707                 return LDB_ERR_OPERATIONS_ERROR;
1708         }
1709
1710         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1711         if (!flags_string) {
1712                 return LDB_ERR_OPERATIONS_ERROR;
1713         }
1714         flagsv = data_blob_string_const(flags_string);
1715
1716         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1717         if (ret != LDB_SUCCESS) return ret;
1718
1719         /* get the ADDTIME from the original */
1720         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1721         if (old_addtime == NULL) {
1722                 old_addtime = &tval;
1723         }
1724         if (dsdb_dn != old_dsdb_dn ||
1725             ldb_dn_get_extended_component(dn, "RMD_ADDTIME") == NULL) {
1726                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1727                 if (ret != LDB_SUCCESS) return ret;
1728         }
1729
1730         /* use our invocation id */
1731         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1732         if (ret != LDB_SUCCESS) return ret;
1733
1734         /* changetime is the current time */
1735         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1736         if (ret != LDB_SUCCESS) return ret;
1737
1738         /* update the USN */
1739         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1740         if (ret != LDB_SUCCESS) return ret;
1741
1742         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1743         if (ret != LDB_SUCCESS) return ret;
1744
1745         /* increase the version by 1 */
1746         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1747         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1748                 version = old_version+1;
1749         }
1750         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1751         vers = data_blob_string_const(vstring);
1752         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1753         if (ret != LDB_SUCCESS) return ret;
1754
1755         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1756         if (dnstring == NULL) {
1757                 return LDB_ERR_OPERATIONS_ERROR;
1758         }
1759         *v = data_blob_string_const(dnstring);
1760
1761         return LDB_SUCCESS;
1762 }
1763
1764 /*
1765   handle adding a linked attribute
1766  */
1767 static int replmd_modify_la_add(struct ldb_module *module,
1768                                 const struct dsdb_schema *schema,
1769                                 struct ldb_message *msg,
1770                                 struct ldb_message_element *el,
1771                                 struct ldb_message_element *old_el,
1772                                 const struct dsdb_attribute *schema_attr,
1773                                 uint64_t seq_num,
1774                                 time_t t,
1775                                 struct GUID *msg_guid,
1776                                 struct ldb_request *parent)
1777 {
1778         unsigned int i;
1779         struct parsed_dn *dns, *old_dns;
1780         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1781         int ret;
1782         struct ldb_val *new_values = NULL;
1783         unsigned int num_new_values = 0;
1784         unsigned old_num_values = old_el?old_el->num_values:0;
1785         const struct GUID *invocation_id;
1786         struct ldb_context *ldb = ldb_module_get_ctx(module);
1787         NTTIME now;
1788
1789         unix_to_nt_time(&now, t);
1790
1791         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
1792         if (ret != LDB_SUCCESS) {
1793                 talloc_free(tmp_ctx);
1794                 return ret;
1795         }
1796
1797         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
1798         if (ret != LDB_SUCCESS) {
1799                 talloc_free(tmp_ctx);
1800                 return ret;
1801         }
1802
1803         invocation_id = samdb_ntds_invocation_id(ldb);
1804         if (!invocation_id) {
1805                 talloc_free(tmp_ctx);
1806                 return LDB_ERR_OPERATIONS_ERROR;
1807         }
1808
1809         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1810         if (ret != LDB_SUCCESS) {
1811                 talloc_free(tmp_ctx);
1812                 return ret;
1813         }
1814
1815         /* for each new value, see if it exists already with the same GUID */
1816         for (i=0; i<el->num_values; i++) {
1817                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1818                 if (p == NULL) {
1819                         /* this is a new linked attribute value */
1820                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1821                         if (new_values == NULL) {
1822                                 ldb_module_oom(module);
1823                                 talloc_free(tmp_ctx);
1824                                 return LDB_ERR_OPERATIONS_ERROR;
1825                         }
1826                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1827                                                   invocation_id, seq_num, seq_num, now, 0, false);
1828                         if (ret != LDB_SUCCESS) {
1829                                 talloc_free(tmp_ctx);
1830                                 return ret;
1831                         }
1832                         num_new_values++;
1833                 } else {
1834                         /* this is only allowed if the GUID was
1835                            previously deleted. */
1836                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1837
1838                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1839                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1840                                                        el->name, GUID_string(tmp_ctx, p->guid));
1841                                 talloc_free(tmp_ctx);
1842                                 /* error codes for 'member' need to be
1843                                    special cased */
1844                                 if (ldb_attr_cmp(el->name, "member") == 0) {
1845                                         return LDB_ERR_ENTRY_ALREADY_EXISTS;
1846                                 } else {
1847                                         return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1848                                 }
1849                         }
1850                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1851                                                    invocation_id, seq_num, seq_num, now, 0, false);
1852                         if (ret != LDB_SUCCESS) {
1853                                 talloc_free(tmp_ctx);
1854                                 return ret;
1855                         }
1856                 }
1857
1858                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1859                 if (ret != LDB_SUCCESS) {
1860                         talloc_free(tmp_ctx);
1861                         return ret;
1862                 }
1863         }
1864
1865         /* add the new ones on to the end of the old values, constructing a new el->values */
1866         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1867                                     struct ldb_val,
1868                                     old_num_values+num_new_values);
1869         if (el->values == NULL) {
1870                 ldb_module_oom(module);
1871                 return LDB_ERR_OPERATIONS_ERROR;
1872         }
1873
1874         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1875         el->num_values = old_num_values + num_new_values;
1876
1877         talloc_steal(msg->elements, el->values);
1878         talloc_steal(el->values, new_values);
1879
1880         talloc_free(tmp_ctx);
1881
1882         /* we now tell the backend to replace all existing values
1883            with the one we have constructed */
1884         el->flags = LDB_FLAG_MOD_REPLACE;
1885
1886         return LDB_SUCCESS;
1887 }
1888
1889
1890 /*
1891   handle deleting all active linked attributes
1892  */
1893 static int replmd_modify_la_delete(struct ldb_module *module,
1894                                    const struct dsdb_schema *schema,
1895                                    struct ldb_message *msg,
1896                                    struct ldb_message_element *el,
1897                                    struct ldb_message_element *old_el,
1898                                    const struct dsdb_attribute *schema_attr,
1899                                    uint64_t seq_num,
1900                                    time_t t,
1901                                    struct GUID *msg_guid,
1902                                    struct ldb_request *parent)
1903 {
1904         unsigned int i;
1905         struct parsed_dn *dns, *old_dns;
1906         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1907         int ret;
1908         const struct GUID *invocation_id;
1909         struct ldb_context *ldb = ldb_module_get_ctx(module);
1910         NTTIME now;
1911
1912         unix_to_nt_time(&now, t);
1913
1914         /* check if there is nothing to delete */
1915         if ((!old_el || old_el->num_values == 0) &&
1916             el->num_values == 0) {
1917                 return LDB_SUCCESS;
1918         }
1919
1920         if (!old_el || old_el->num_values == 0) {
1921                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1922         }
1923
1924         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
1925         if (ret != LDB_SUCCESS) {
1926                 talloc_free(tmp_ctx);
1927                 return ret;
1928         }
1929
1930         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
1931         if (ret != LDB_SUCCESS) {
1932                 talloc_free(tmp_ctx);
1933                 return ret;
1934         }
1935
1936         invocation_id = samdb_ntds_invocation_id(ldb);
1937         if (!invocation_id) {
1938                 return LDB_ERR_OPERATIONS_ERROR;
1939         }
1940
1941         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
1942         if (ret != LDB_SUCCESS) {
1943                 talloc_free(tmp_ctx);
1944                 return ret;
1945         }
1946
1947         el->values = NULL;
1948
1949         /* see if we are being asked to delete any links that
1950            don't exist or are already deleted */
1951         for (i=0; i<el->num_values; i++) {
1952                 struct parsed_dn *p = &dns[i];
1953                 struct parsed_dn *p2;
1954                 uint32_t rmd_flags;
1955
1956                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1957                 if (!p2) {
1958                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1959                                                el->name, GUID_string(tmp_ctx, p->guid));
1960                         if (ldb_attr_cmp(el->name, "member") == 0) {
1961                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1962                         } else {
1963                                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1964                         }
1965                 }
1966                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1967                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1968                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1969                                                el->name, GUID_string(tmp_ctx, p->guid));
1970                         if (ldb_attr_cmp(el->name, "member") == 0) {
1971                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1972                         } else {
1973                                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1974                         }
1975                 }
1976         }
1977
1978         /* for each new value, see if it exists already with the same GUID
1979            if it is not already deleted and matches the delete list then delete it
1980         */
1981         for (i=0; i<old_el->num_values; i++) {
1982                 struct parsed_dn *p = &old_dns[i];
1983                 uint32_t rmd_flags;
1984
1985                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1986                         continue;
1987                 }
1988
1989                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1990                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1991
1992                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1993                                            invocation_id, seq_num, seq_num, now, 0, true);
1994                 if (ret != LDB_SUCCESS) {
1995                         talloc_free(tmp_ctx);
1996                         return ret;
1997                 }
1998
1999                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
2000                 if (ret != LDB_SUCCESS) {
2001                         talloc_free(tmp_ctx);
2002                         return ret;
2003                 }
2004         }
2005
2006         el->values = talloc_steal(msg->elements, old_el->values);
2007         el->num_values = old_el->num_values;
2008
2009         talloc_free(tmp_ctx);
2010
2011         /* we now tell the backend to replace all existing values
2012            with the one we have constructed */
2013         el->flags = LDB_FLAG_MOD_REPLACE;
2014
2015         return LDB_SUCCESS;
2016 }
2017
2018 /*
2019   handle replacing a linked attribute
2020  */
2021 static int replmd_modify_la_replace(struct ldb_module *module,
2022                                     const struct dsdb_schema *schema,
2023                                     struct ldb_message *msg,
2024                                     struct ldb_message_element *el,
2025                                     struct ldb_message_element *old_el,
2026                                     const struct dsdb_attribute *schema_attr,
2027                                     uint64_t seq_num,
2028                                     time_t t,
2029                                     struct GUID *msg_guid,
2030                                     struct ldb_request *parent)
2031 {
2032         unsigned int i;
2033         struct parsed_dn *dns, *old_dns;
2034         TALLOC_CTX *tmp_ctx = talloc_new(msg);
2035         int ret;
2036         const struct GUID *invocation_id;
2037         struct ldb_context *ldb = ldb_module_get_ctx(module);
2038         struct ldb_val *new_values = NULL;
2039         unsigned int num_new_values = 0;
2040         unsigned int old_num_values = old_el?old_el->num_values:0;
2041         NTTIME now;
2042
2043         unix_to_nt_time(&now, t);
2044
2045         /* check if there is nothing to replace */
2046         if ((!old_el || old_el->num_values == 0) &&
2047             el->num_values == 0) {
2048                 return LDB_SUCCESS;
2049         }
2050
2051         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
2052         if (ret != LDB_SUCCESS) {
2053                 talloc_free(tmp_ctx);
2054                 return ret;
2055         }
2056
2057         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
2058         if (ret != LDB_SUCCESS) {
2059                 talloc_free(tmp_ctx);
2060                 return ret;
2061         }
2062
2063         invocation_id = samdb_ntds_invocation_id(ldb);
2064         if (!invocation_id) {
2065                 return LDB_ERR_OPERATIONS_ERROR;
2066         }
2067
2068         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
2069         if (ret != LDB_SUCCESS) {
2070                 talloc_free(tmp_ctx);
2071                 return ret;
2072         }
2073
2074         /* mark all the old ones as deleted */
2075         for (i=0; i<old_num_values; i++) {
2076                 struct parsed_dn *old_p = &old_dns[i];
2077                 struct parsed_dn *p;
2078                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
2079
2080                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
2081
2082                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
2083                 if (ret != LDB_SUCCESS) {
2084                         talloc_free(tmp_ctx);
2085                         return ret;
2086                 }
2087
2088                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
2089                 if (p) {
2090                         /* we don't delete it if we are re-adding it */
2091                         continue;
2092                 }
2093
2094                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
2095                                            invocation_id, seq_num, seq_num, now, 0, true);
2096                 if (ret != LDB_SUCCESS) {
2097                         talloc_free(tmp_ctx);
2098                         return ret;
2099                 }
2100         }
2101
2102         /* for each new value, either update its meta-data, or add it
2103          * to old_el
2104         */
2105         for (i=0; i<el->num_values; i++) {
2106                 struct parsed_dn *p = &dns[i], *old_p;
2107
2108                 if (old_dns &&
2109                     (old_p = parsed_dn_find(old_dns,
2110                                             old_num_values, p->guid, NULL)) != NULL) {
2111                         /* update in place */
2112                         ret = replmd_update_la_val(old_el->values, old_p->v, p->dsdb_dn,
2113                                                    old_p->dsdb_dn, invocation_id,
2114                                                    seq_num, seq_num, now, 0, false);
2115                         if (ret != LDB_SUCCESS) {
2116                                 talloc_free(tmp_ctx);
2117                                 return ret;
2118                         }
2119                 } else {
2120                         /* add a new one */
2121                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
2122                                                     num_new_values+1);
2123                         if (new_values == NULL) {
2124                                 ldb_module_oom(module);
2125                                 talloc_free(tmp_ctx);
2126                                 return LDB_ERR_OPERATIONS_ERROR;
2127                         }
2128                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
2129                                                   invocation_id, seq_num, seq_num, now, 0, false);
2130                         if (ret != LDB_SUCCESS) {
2131                                 talloc_free(tmp_ctx);
2132                                 return ret;
2133                         }
2134                         num_new_values++;
2135                 }
2136
2137                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
2138                 if (ret != LDB_SUCCESS) {
2139                         talloc_free(tmp_ctx);
2140                         return ret;
2141                 }
2142         }
2143
2144         /* add the new values to the end of old_el */
2145         if (num_new_values != 0) {
2146                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
2147                                             struct ldb_val, old_num_values+num_new_values);
2148                 if (el->values == NULL) {
2149                         ldb_module_oom(module);
2150                         return LDB_ERR_OPERATIONS_ERROR;
2151                 }
2152                 memcpy(&el->values[old_num_values], &new_values[0],
2153                        sizeof(struct ldb_val)*num_new_values);
2154                 el->num_values = old_num_values + num_new_values;
2155                 talloc_steal(msg->elements, new_values);
2156         } else {
2157                 el->values = old_el->values;
2158                 el->num_values = old_el->num_values;
2159                 talloc_steal(msg->elements, el->values);
2160         }
2161
2162         talloc_free(tmp_ctx);
2163
2164         /* we now tell the backend to replace all existing values
2165            with the one we have constructed */
2166         el->flags = LDB_FLAG_MOD_REPLACE;
2167
2168         return LDB_SUCCESS;
2169 }
2170
2171
2172 /*
2173   handle linked attributes in modify requests
2174  */
2175 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
2176                                                struct ldb_message *msg,
2177                                                uint64_t seq_num, time_t t,
2178                                                struct ldb_request *parent)
2179 {
2180         struct ldb_result *res;
2181         unsigned int i;
2182         int ret;
2183         struct ldb_context *ldb = ldb_module_get_ctx(module);
2184         struct ldb_message *old_msg;
2185
2186         const struct dsdb_schema *schema;
2187         struct GUID old_guid;
2188
2189         if (seq_num == 0) {
2190                 /* there the replmd_update_rpmd code has already
2191                  * checked and saw that there are no linked
2192                  * attributes */
2193                 return LDB_SUCCESS;
2194         }
2195
2196         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
2197                 /* don't do anything special for linked attributes */
2198                 return LDB_SUCCESS;
2199         }
2200
2201         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
2202                                     DSDB_FLAG_NEXT_MODULE |
2203                                     DSDB_SEARCH_SHOW_RECYCLED |
2204                                     DSDB_SEARCH_REVEAL_INTERNALS |
2205                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT,
2206                                     parent);
2207         if (ret != LDB_SUCCESS) {
2208                 return ret;
2209         }
2210         schema = dsdb_get_schema(ldb, res);
2211         if (!schema) {
2212                 return LDB_ERR_OPERATIONS_ERROR;
2213         }
2214
2215         old_msg = res->msgs[0];
2216
2217         old_guid = samdb_result_guid(old_msg, "objectGUID");
2218
2219         for (i=0; i<msg->num_elements; i++) {
2220                 struct ldb_message_element *el = &msg->elements[i];
2221                 struct ldb_message_element *old_el, *new_el;
2222                 const struct dsdb_attribute *schema_attr
2223                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2224                 if (!schema_attr) {
2225                         ldb_asprintf_errstring(ldb,
2226                                                "%s: attribute %s is not a valid attribute in schema",
2227                                                __FUNCTION__, el->name);
2228                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
2229                 }
2230                 if (schema_attr->linkID == 0) {
2231                         continue;
2232                 }
2233                 if ((schema_attr->linkID & 1) == 1) {
2234                         if (parent && ldb_request_get_control(parent, DSDB_CONTROL_DBCHECK)) {
2235                                 continue;
2236                         }
2237                         /* Odd is for the target.  Illegal to modify */
2238                         ldb_asprintf_errstring(ldb,
2239                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
2240                         return LDB_ERR_UNWILLING_TO_PERFORM;
2241                 }
2242                 old_el = ldb_msg_find_element(old_msg, el->name);
2243                 switch (el->flags & LDB_FLAG_MOD_MASK) {
2244                 case LDB_FLAG_MOD_REPLACE:
2245                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2246                         break;
2247                 case LDB_FLAG_MOD_DELETE:
2248                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2249                         break;
2250                 case LDB_FLAG_MOD_ADD:
2251                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2252                         break;
2253                 default:
2254                         ldb_asprintf_errstring(ldb,
2255                                                "invalid flags 0x%x for %s linked attribute",
2256                                                el->flags, el->name);
2257                         return LDB_ERR_UNWILLING_TO_PERFORM;
2258                 }
2259                 if (dsdb_check_single_valued_link(schema_attr, el) != LDB_SUCCESS) {
2260                         ldb_asprintf_errstring(ldb,
2261                                                "Attribute %s is single valued but more than one value has been supplied",
2262                                                el->name);
2263                         return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
2264                 } else {
2265                         el->flags |= LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK;
2266                 }
2267
2268
2269
2270                 if (ret != LDB_SUCCESS) {
2271                         return ret;
2272                 }
2273                 if (old_el) {
2274                         ldb_msg_remove_attr(old_msg, el->name);
2275                 }
2276                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2277                 new_el->num_values = el->num_values;
2278                 new_el->values = talloc_steal(msg->elements, el->values);
2279
2280                 /* TODO: this relises a bit too heavily on the exact
2281                    behaviour of ldb_msg_find_element and
2282                    ldb_msg_remove_element */
2283                 old_el = ldb_msg_find_element(msg, el->name);
2284                 if (old_el != el) {
2285                         ldb_msg_remove_element(msg, old_el);
2286                         i--;
2287                 }
2288         }
2289
2290         talloc_free(res);
2291         return ret;
2292 }
2293
2294
2295
2296 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2297 {
2298         struct ldb_context *ldb;
2299         struct replmd_replicated_request *ac;
2300         struct ldb_request *down_req;
2301         struct ldb_message *msg;
2302         time_t t = time(NULL);
2303         int ret;
2304         bool is_urgent = false, rodc = false;
2305         unsigned int functional_level;
2306         const DATA_BLOB *guid_blob;
2307
2308         /* do not manipulate our control entries */
2309         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2310                 return ldb_next_request(module, req);
2311         }
2312
2313         ldb = ldb_module_get_ctx(module);
2314
2315         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2316
2317         guid_blob = ldb_msg_find_ldb_val(req->op.mod.message, "objectGUID");
2318         if ( guid_blob != NULL ) {
2319                 ldb_set_errstring(ldb,
2320                                   "replmd_modify: it's not allowed to change the objectGUID!");
2321                 return LDB_ERR_CONSTRAINT_VIOLATION;
2322         }
2323
2324         ac = replmd_ctx_init(module, req);
2325         if (ac == NULL) {
2326                 return ldb_module_oom(module);
2327         }
2328
2329         functional_level = dsdb_functional_level(ldb);
2330
2331         /* we have to copy the message as the caller might have it as a const */
2332         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2333         if (msg == NULL) {
2334                 ldb_oom(ldb);
2335                 talloc_free(ac);
2336                 return LDB_ERR_OPERATIONS_ERROR;
2337         }
2338
2339         ldb_msg_remove_attr(msg, "whenChanged");
2340         ldb_msg_remove_attr(msg, "uSNChanged");
2341
2342         ret = replmd_update_rpmd(module, ac->schema, req, NULL,
2343                                  msg, &ac->seq_num, t, &is_urgent, &rodc);
2344         if (rodc && (ret == LDB_ERR_REFERRAL)) {
2345                 struct loadparm_context *lp_ctx;
2346                 char *referral;
2347
2348                 lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2349                                          struct loadparm_context);
2350
2351                 referral = talloc_asprintf(req,
2352                                            "ldap://%s/%s",
2353                                            lpcfg_dnsdomain(lp_ctx),
2354                                            ldb_dn_get_linearized(msg->dn));
2355                 ret = ldb_module_send_referral(req, referral);
2356                 talloc_free(ac);
2357                 return ret;
2358         }
2359
2360         if (ret != LDB_SUCCESS) {
2361                 talloc_free(ac);
2362                 return ret;
2363         }
2364
2365         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t, req);
2366         if (ret != LDB_SUCCESS) {
2367                 talloc_free(ac);
2368                 return ret;
2369         }
2370
2371         /* TODO:
2372          * - replace the old object with the newly constructed one
2373          */
2374
2375         ac->is_urgent = is_urgent;
2376
2377         ret = ldb_build_mod_req(&down_req, ldb, ac,
2378                                 msg,
2379                                 req->controls,
2380                                 ac, replmd_op_callback,
2381                                 req);
2382         LDB_REQ_SET_LOCATION(down_req);
2383         if (ret != LDB_SUCCESS) {
2384                 talloc_free(ac);
2385                 return ret;
2386         }
2387
2388         /* current partition control is needed by "replmd_op_callback" */
2389         if (ldb_request_get_control(req, DSDB_CONTROL_CURRENT_PARTITION_OID) == NULL) {
2390                 ret = ldb_request_add_control(down_req,
2391                                               DSDB_CONTROL_CURRENT_PARTITION_OID,
2392                                               false, NULL);
2393                 if (ret != LDB_SUCCESS) {
2394                         talloc_free(ac);
2395                         return ret;
2396                 }
2397         }
2398
2399         /* If we are in functional level 2000, then
2400          * replmd_modify_handle_linked_attribs will have done
2401          * nothing */
2402         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
2403                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
2404                 if (ret != LDB_SUCCESS) {
2405                         talloc_free(ac);
2406                         return ret;
2407                 }
2408         }
2409
2410         talloc_steal(down_req, msg);
2411
2412         /* we only change whenChanged and uSNChanged if the seq_num
2413            has changed */
2414         if (ac->seq_num != 0) {
2415                 ret = add_time_element(msg, "whenChanged", t);
2416                 if (ret != LDB_SUCCESS) {
2417                         talloc_free(ac);
2418                         ldb_operr(ldb);
2419                         return ret;
2420                 }
2421
2422                 ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
2423                 if (ret != LDB_SUCCESS) {
2424                         talloc_free(ac);
2425                         ldb_operr(ldb);
2426                         return ret;
2427                 }
2428         }
2429
2430         /* go on with the call chain */
2431         return ldb_next_request(module, down_req);
2432 }
2433
2434 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2435
2436 /*
2437   handle a rename request
2438
2439   On a rename we need to do an extra ldb_modify which sets the
2440   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2441  */
2442 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2443 {
2444         struct ldb_context *ldb;
2445         struct replmd_replicated_request *ac;
2446         int ret;
2447         struct ldb_request *down_req;
2448
2449         /* do not manipulate our control entries */
2450         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2451                 return ldb_next_request(module, req);
2452         }
2453
2454         ldb = ldb_module_get_ctx(module);
2455
2456         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2457
2458         ac = replmd_ctx_init(module, req);
2459         if (ac == NULL) {
2460                 return ldb_module_oom(module);
2461         }
2462
2463         ret = ldb_build_rename_req(&down_req, ldb, ac,
2464                                    ac->req->op.rename.olddn,
2465                                    ac->req->op.rename.newdn,
2466                                    ac->req->controls,
2467                                    ac, replmd_rename_callback,
2468                                    ac->req);
2469         LDB_REQ_SET_LOCATION(down_req);
2470         if (ret != LDB_SUCCESS) {
2471                 talloc_free(ac);
2472                 return ret;
2473         }
2474
2475         /* go on with the call chain */
2476         return ldb_next_request(module, down_req);
2477 }
2478
2479 /* After the rename is compleated, update the whenchanged etc */
2480 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2481 {
2482         struct ldb_context *ldb;
2483         struct replmd_replicated_request *ac;
2484         struct ldb_request *down_req;
2485         struct ldb_message *msg;
2486         const struct dsdb_attribute *rdn_attr;
2487         const char *rdn_name;
2488         const struct ldb_val *rdn_val;
2489         const char *attrs[5] = { NULL, };
2490         time_t t = time(NULL);
2491         int ret;
2492         bool is_urgent = false, rodc = false;
2493
2494         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2495         ldb = ldb_module_get_ctx(ac->module);
2496
2497         if (ares->error != LDB_SUCCESS) {
2498                 return ldb_module_done(ac->req, ares->controls,
2499                                         ares->response, ares->error);
2500         }
2501
2502         if (ares->type != LDB_REPLY_DONE) {
2503                 ldb_set_errstring(ldb,
2504                                   "invalid ldb_reply_type in callback");
2505                 talloc_free(ares);
2506                 return ldb_module_done(ac->req, NULL, NULL,
2507                                         LDB_ERR_OPERATIONS_ERROR);
2508         }
2509
2510         /* TODO:
2511          * - replace the old object with the newly constructed one
2512          */
2513
2514         msg = ldb_msg_new(ac);
2515         if (msg == NULL) {
2516                 ldb_oom(ldb);
2517                 return LDB_ERR_OPERATIONS_ERROR;
2518         }
2519
2520         msg->dn = ac->req->op.rename.newdn;
2521
2522         rdn_name = ldb_dn_get_rdn_name(msg->dn);
2523         if (rdn_name == NULL) {
2524                 talloc_free(ares);
2525                 return ldb_module_done(ac->req, NULL, NULL,
2526                                        ldb_operr(ldb));
2527         }
2528
2529         /* normalize the rdn attribute name */
2530         rdn_attr = dsdb_attribute_by_lDAPDisplayName(ac->schema, rdn_name);
2531         if (rdn_attr == NULL) {
2532                 talloc_free(ares);
2533                 return ldb_module_done(ac->req, NULL, NULL,
2534                                        ldb_operr(ldb));
2535         }
2536         rdn_name = rdn_attr->lDAPDisplayName;
2537
2538         rdn_val = ldb_dn_get_rdn_val(msg->dn);
2539         if (rdn_val == NULL) {
2540                 talloc_free(ares);
2541                 return ldb_module_done(ac->req, NULL, NULL,
2542                                        ldb_operr(ldb));
2543         }
2544
2545         if (ldb_msg_add_empty(msg, rdn_name, LDB_FLAG_MOD_REPLACE, NULL) != 0) {
2546                 talloc_free(ares);
2547                 return ldb_module_done(ac->req, NULL, NULL,
2548                                        ldb_oom(ldb));
2549         }
2550         if (ldb_msg_add_value(msg, rdn_name, rdn_val, NULL) != 0) {
2551                 talloc_free(ares);
2552                 return ldb_module_done(ac->req, NULL, NULL,
2553                                        ldb_oom(ldb));
2554         }
2555         if (ldb_msg_add_empty(msg, "name", LDB_FLAG_MOD_REPLACE, NULL) != 0) {
2556                 talloc_free(ares);
2557                 return ldb_module_done(ac->req, NULL, NULL,
2558                                        ldb_oom(ldb));
2559         }
2560         if (ldb_msg_add_value(msg, "name", rdn_val, NULL) != 0) {
2561                 talloc_free(ares);
2562                 return ldb_module_done(ac->req, NULL, NULL,
2563                                        ldb_oom(ldb));
2564         }
2565
2566         /*
2567          * here we let replmd_update_rpmd() only search for
2568          * the existing "replPropertyMetaData" and rdn_name attributes.
2569          *
2570          * We do not want the existing "name" attribute as
2571          * the "name" attribute needs to get the version
2572          * updated on rename even if the rdn value hasn't changed.
2573          *
2574          * This is the diff of the meta data, for a moved user
2575          * on a w2k8r2 server:
2576          *
2577          * # record 1
2578          * -dn: CN=sdf df,CN=Users,DC=bla,DC=base
2579          * +dn: CN=sdf df,OU=TestOU,DC=bla,DC=base
2580          *  replPropertyMetaData:     NDR: struct replPropertyMetaDataBlob
2581          *         version                  : 0x00000001 (1)
2582          *         reserved                 : 0x00000000 (0)
2583          * @@ -66,11 +66,11 @@ replPropertyMetaData:     NDR: struct re
2584          *                      local_usn                : 0x00000000000037a5 (14245)
2585          *                 array: struct replPropertyMetaData1
2586          *                      attid                    : DRSUAPI_ATTID_name (0x90001)
2587          * -                    version                  : 0x00000001 (1)
2588          * -                    originating_change_time  : Wed Feb  9 17:20:49 2011 CET
2589          * +                    version                  : 0x00000002 (2)
2590          * +                    originating_change_time  : Wed Apr  6 15:21:01 2011 CEST
2591          *                      originating_invocation_id: 0d36ca05-5507-4e62-aca3-354bab0d39e1
2592          * -                    originating_usn          : 0x00000000000037a5 (14245)
2593          * -                    local_usn                : 0x00000000000037a5 (14245)
2594          * +                    originating_usn          : 0x0000000000003834 (14388)
2595          * +                    local_usn                : 0x0000000000003834 (14388)
2596          *                 array: struct replPropertyMetaData1
2597          *                      attid                    : DRSUAPI_ATTID_userAccountControl (0x90008)
2598          *                      version                  : 0x00000004 (4)
2599          */
2600         attrs[0] = "replPropertyMetaData";
2601         attrs[1] = "objectClass";
2602         attrs[2] = "instanceType";
2603         attrs[3] = rdn_name;
2604         attrs[4] = NULL;
2605
2606         ret = replmd_update_rpmd(ac->module, ac->schema, req, attrs,
2607                                  msg, &ac->seq_num, t, &is_urgent, &rodc);
2608         if (rodc && (ret == LDB_ERR_REFERRAL)) {
2609                 struct ldb_dn *olddn = ac->req->op.rename.olddn;
2610                 struct loadparm_context *lp_ctx;
2611                 char *referral;
2612
2613                 lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2614                                          struct loadparm_context);
2615
2616                 referral = talloc_asprintf(req,
2617                                            "ldap://%s/%s",
2618                                            lpcfg_dnsdomain(lp_ctx),
2619                                            ldb_dn_get_linearized(olddn));
2620                 ret = ldb_module_send_referral(req, referral);
2621                 talloc_free(ares);
2622                 return ldb_module_done(req, NULL, NULL, ret);
2623         }
2624
2625         if (ret != LDB_SUCCESS) {
2626                 talloc_free(ares);
2627                 return ldb_module_done(ac->req, NULL, NULL, ret);
2628         }
2629
2630         if (ac->seq_num == 0) {
2631                 talloc_free(ares);
2632                 return ldb_module_done(ac->req, NULL, NULL,
2633                                        ldb_error(ldb, ret,
2634                                         "internal error seq_num == 0"));
2635         }
2636         ac->is_urgent = is_urgent;
2637
2638         ret = ldb_build_mod_req(&down_req, ldb, ac,
2639                                 msg,
2640                                 req->controls,
2641                                 ac, replmd_op_callback,
2642                                 req);
2643         LDB_REQ_SET_LOCATION(down_req);
2644         if (ret != LDB_SUCCESS) {
2645                 talloc_free(ac);
2646                 return ret;
2647         }
2648
2649         /* current partition control is needed by "replmd_op_callback" */
2650         if (ldb_request_get_control(req, DSDB_CONTROL_CURRENT_PARTITION_OID) == NULL) {
2651                 ret = ldb_request_add_control(down_req,
2652                                               DSDB_CONTROL_CURRENT_PARTITION_OID,
2653                                               false, NULL);
2654                 if (ret != LDB_SUCCESS) {
2655                         talloc_free(ac);
2656                         return ret;
2657                 }
2658         }
2659
2660         talloc_steal(down_req, msg);
2661
2662         ret = add_time_element(msg, "whenChanged", t);
2663         if (ret != LDB_SUCCESS) {
2664                 talloc_free(ac);
2665                 ldb_operr(ldb);
2666                 return ret;
2667         }
2668
2669         ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
2670         if (ret != LDB_SUCCESS) {
2671                 talloc_free(ac);
2672                 ldb_operr(ldb);
2673                 return ret;
2674         }
2675
2676         /* go on with the call chain - do the modify after the rename */
2677         return ldb_next_request(ac->module, down_req);
2678 }
2679
2680 /*
2681    remove links from objects that point at this object when an object
2682    is deleted
2683  */
2684 static int replmd_delete_remove_link(struct ldb_module *module,
2685                                      const struct dsdb_schema *schema,
2686                                      struct ldb_dn *dn,
2687                                      struct ldb_message_element *el,
2688                                      const struct dsdb_attribute *sa,
2689                                      struct ldb_request *parent)
2690 {
2691         unsigned int i;
2692         TALLOC_CTX *tmp_ctx = talloc_new(module);
2693         struct ldb_context *ldb = ldb_module_get_ctx(module);
2694
2695         for (i=0; i<el->num_values; i++) {
2696                 struct dsdb_dn *dsdb_dn;
2697                 NTSTATUS status;
2698                 int ret;
2699                 struct GUID guid2;
2700                 struct ldb_message *msg;
2701                 const struct dsdb_attribute *target_attr;
2702                 struct ldb_message_element *el2;
2703                 struct ldb_val dn_val;
2704
2705                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2706                         continue;
2707                 }
2708
2709                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2710                 if (!dsdb_dn) {
2711                         talloc_free(tmp_ctx);
2712                         return LDB_ERR_OPERATIONS_ERROR;
2713                 }
2714
2715                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2716                 if (!NT_STATUS_IS_OK(status)) {
2717                         talloc_free(tmp_ctx);
2718                         return LDB_ERR_OPERATIONS_ERROR;
2719                 }
2720
2721                 /* remove the link */
2722                 msg = ldb_msg_new(tmp_ctx);
2723                 if (!msg) {
2724                         ldb_module_oom(module);
2725                         talloc_free(tmp_ctx);
2726                         return LDB_ERR_OPERATIONS_ERROR;
2727                 }
2728
2729
2730                 msg->dn = dsdb_dn->dn;
2731
2732                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2733                 if (target_attr == NULL) {
2734                         continue;
2735                 }
2736
2737                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2738                 if (ret != LDB_SUCCESS) {
2739                         ldb_module_oom(module);
2740                         talloc_free(tmp_ctx);
2741                         return LDB_ERR_OPERATIONS_ERROR;
2742                 }
2743                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2744                 el2->values = &dn_val;
2745                 el2->num_values = 1;
2746
2747                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE, parent);
2748                 if (ret != LDB_SUCCESS) {
2749                         talloc_free(tmp_ctx);
2750                         return ret;
2751                 }
2752         }
2753         talloc_free(tmp_ctx);
2754         return LDB_SUCCESS;
2755 }
2756
2757
2758 /*
2759   handle update of replication meta data for deletion of objects
2760
2761   This also handles the mapping of delete to a rename operation
2762   to allow deletes to be replicated.
2763  */
2764 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2765 {
2766         int ret = LDB_ERR_OTHER;
2767         bool retb, disallow_move_on_delete;
2768         struct ldb_dn *old_dn, *new_dn;
2769         const char *rdn_name;
2770         const struct ldb_val *rdn_value, *new_rdn_value;
2771         struct GUID guid;
2772         struct ldb_context *ldb = ldb_module_get_ctx(module);
2773         const struct dsdb_schema *schema;
2774         struct ldb_message *msg, *old_msg;
2775         struct ldb_message_element *el;
2776         TALLOC_CTX *tmp_ctx;
2777         struct ldb_result *res, *parent_res;
2778         const char *preserved_attrs[] = {
2779                 /* yes, this really is a hard coded list. See MS-ADTS
2780                    section 3.1.1.5.5.1.1 */
2781                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2782                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2783                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2784                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2785                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2786                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2787                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2788                 "whenChanged", NULL};
2789         unsigned int i, el_count = 0;
2790         enum deletion_state { OBJECT_NOT_DELETED=1, OBJECT_DELETED=2, OBJECT_RECYCLED=3,
2791                                                 OBJECT_TOMBSTONE=4, OBJECT_REMOVED=5 };
2792         enum deletion_state deletion_state, next_deletion_state;
2793         bool enabled;
2794         int functional_level;
2795
2796         if (ldb_dn_is_special(req->op.del.dn)) {
2797                 return ldb_next_request(module, req);
2798         }
2799
2800         tmp_ctx = talloc_new(ldb);
2801         if (!tmp_ctx) {
2802                 ldb_oom(ldb);
2803                 return LDB_ERR_OPERATIONS_ERROR;
2804         }
2805
2806         schema = dsdb_get_schema(ldb, tmp_ctx);
2807         if (!schema) {
2808                 return LDB_ERR_OPERATIONS_ERROR;
2809         }
2810
2811         functional_level = dsdb_functional_level(ldb);
2812
2813         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2814
2815         /* we need the complete msg off disk, so we can work out which
2816            attributes need to be removed */
2817         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2818                                     DSDB_FLAG_NEXT_MODULE |
2819                                     DSDB_SEARCH_SHOW_RECYCLED |
2820                                     DSDB_SEARCH_REVEAL_INTERNALS |
2821                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT, req);
2822         if (ret != LDB_SUCCESS) {
2823                 talloc_free(tmp_ctx);
2824                 return ret;
2825         }
2826         old_msg = res->msgs[0];
2827
2828
2829         ret = dsdb_recyclebin_enabled(module, &enabled);
2830         if (ret != LDB_SUCCESS) {
2831                 talloc_free(tmp_ctx);
2832                 return ret;
2833         }
2834
2835         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2836                 if (!enabled) {
2837                         deletion_state = OBJECT_TOMBSTONE;
2838                         next_deletion_state = OBJECT_REMOVED;
2839                 } else if (ldb_msg_check_string_attribute(old_msg, "isRecycled", "TRUE")) {
2840                         deletion_state = OBJECT_RECYCLED;
2841                         next_deletion_state = OBJECT_REMOVED;
2842                 } else {
2843                         deletion_state = OBJECT_DELETED;
2844                         next_deletion_state = OBJECT_RECYCLED;
2845                 }
2846         } else {
2847                 deletion_state = OBJECT_NOT_DELETED;
2848                 if (enabled) {
2849                         next_deletion_state = OBJECT_DELETED;
2850                 } else {
2851                         next_deletion_state = OBJECT_TOMBSTONE;
2852                 }
2853         }
2854
2855         if (next_deletion_state == OBJECT_REMOVED) {
2856                 struct auth_session_info *session_info =
2857                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2858                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2859                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2860                                         ldb_dn_get_linearized(old_msg->dn));
2861                         return LDB_ERR_UNWILLING_TO_PERFORM;
2862                 }
2863
2864                 /* it is already deleted - really remove it this time */
2865                 talloc_free(tmp_ctx);
2866                 return ldb_next_request(module, req);
2867         }
2868
2869         rdn_name = ldb_dn_get_rdn_name(old_dn);
2870         rdn_value = ldb_dn_get_rdn_val(old_dn);
2871         if ((rdn_name == NULL) || (rdn_value == NULL)) {
2872                 talloc_free(tmp_ctx);
2873                 return ldb_operr(ldb);
2874         }
2875
2876         msg = ldb_msg_new(tmp_ctx);
2877         if (msg == NULL) {
2878                 ldb_module_oom(module);
2879                 talloc_free(tmp_ctx);
2880                 return LDB_ERR_OPERATIONS_ERROR;
2881         }
2882
2883         msg->dn = old_dn;
2884
2885         if (deletion_state == OBJECT_NOT_DELETED){
2886                 /* consider the SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE flag */
2887                 disallow_move_on_delete =
2888                         (ldb_msg_find_attr_as_int(old_msg, "systemFlags", 0)
2889                                 & SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE);
2890
2891                 /* work out where we will be renaming this object to */
2892                 if (!disallow_move_on_delete) {
2893                         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn,
2894                                                           &new_dn);
2895                         if (ret != LDB_SUCCESS) {
2896                                 /* this is probably an attempted delete on a partition
2897                                  * that doesn't allow delete operations, such as the
2898                                  * schema partition */
2899                                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2900                                                            ldb_dn_get_linearized(old_dn));
2901                                 talloc_free(tmp_ctx);
2902                                 return LDB_ERR_UNWILLING_TO_PERFORM;
2903                         }
2904                 } else {
2905                         new_dn = ldb_dn_get_parent(tmp_ctx, old_dn);
2906                         if (new_dn == NULL) {
2907                                 ldb_module_oom(module);
2908                                 talloc_free(tmp_ctx);
2909                                 return LDB_ERR_OPERATIONS_ERROR;
2910                         }
2911                 }
2912
2913                 /* get the objects GUID from the search we just did */
2914                 guid = samdb_result_guid(old_msg, "objectGUID");
2915
2916                 /* Add a formatted child */
2917                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2918                                                 rdn_name,
2919                                                 ldb_dn_escape_value(tmp_ctx, *rdn_value),
2920                                                 GUID_string(tmp_ctx, &guid));
2921                 if (!retb) {
2922                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2923                                         ldb_dn_get_linearized(new_dn)));
2924                         talloc_free(tmp_ctx);
2925                         return LDB_ERR_OPERATIONS_ERROR;
2926                 }
2927
2928                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2929                 if (ret != LDB_SUCCESS) {
2930                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2931                         ldb_module_oom(module);
2932                         talloc_free(tmp_ctx);
2933                         return ret;
2934                 }
2935                 msg->elements[el_count++].flags = LDB_FLAG_MOD_REPLACE;
2936         }
2937
2938         /*
2939           now we need to modify the object in the following ways:
2940
2941           - add isDeleted=TRUE
2942           - update rDN and name, with new rDN
2943           - remove linked attributes
2944           - remove objectCategory and sAMAccountType
2945           - remove attribs not on the preserved list
2946              - preserved if in above list, or is rDN
2947           - remove all linked attribs from this object
2948           - remove all links from other objects to this object
2949           - add lastKnownParent
2950           - update replPropertyMetaData?
2951
2952           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2953          */
2954
2955         /* we need the storage form of the parent GUID */
2956         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2957                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2958                                     DSDB_FLAG_NEXT_MODULE |
2959                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2960                                     DSDB_SEARCH_REVEAL_INTERNALS|
2961                                     DSDB_SEARCH_SHOW_RECYCLED, req);
2962         if (ret != LDB_SUCCESS) {
2963                 talloc_free(tmp_ctx);
2964                 return ret;
2965         }
2966
2967         if (deletion_state == OBJECT_NOT_DELETED){
2968                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2969                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2970                 if (ret != LDB_SUCCESS) {
2971                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2972                         ldb_module_oom(module);
2973                         talloc_free(tmp_ctx);
2974                         return ret;
2975                 }
2976                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2977         }
2978
2979         switch (next_deletion_state){
2980
2981         case OBJECT_DELETED:
2982
2983                 ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
2984                 if (ret != LDB_SUCCESS) {
2985                         DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
2986                         ldb_module_oom(module);
2987                         talloc_free(tmp_ctx);
2988                         return ret;
2989                 }
2990                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2991
2992                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_REPLACE, NULL);
2993                 if (ret != LDB_SUCCESS) {
2994                         talloc_free(tmp_ctx);
2995                         ldb_module_oom(module);
2996                         return ret;
2997                 }
2998
2999                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_REPLACE, NULL);
3000                 if (ret != LDB_SUCCESS) {
3001                         talloc_free(tmp_ctx);
3002                         ldb_module_oom(module);
3003                         return ret;
3004                 }
3005
3006                 break;
3007
3008         case OBJECT_RECYCLED:
3009         case OBJECT_TOMBSTONE:
3010
3011                 /* we also mark it as recycled, meaning this object can't be
3012                    recovered (we are stripping its attributes) */
3013                 if (functional_level >= DS_DOMAIN_FUNCTION_2008_R2) {
3014                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
3015                         if (ret != LDB_SUCCESS) {
3016                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
3017                                 ldb_module_oom(module);
3018                                 talloc_free(tmp_ctx);
3019                                 return ret;
3020                         }
3021                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
3022                 }
3023
3024                 /* work out which of the old attributes we will be removing */
3025                 for (i=0; i<old_msg->num_elements; i++) {
3026                         const struct dsdb_attribute *sa;
3027                         el = &old_msg->elements[i];
3028                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
3029                         if (!sa) {
3030                                 talloc_free(tmp_ctx);
3031                                 return LDB_ERR_OPERATIONS_ERROR;
3032                         }
3033                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
3034                                 /* don't remove the rDN */
3035                                 continue;
3036                         }
3037                         if (sa->linkID && (sa->linkID & 1)) {
3038                                 /*
3039                                   we have a backlink in this object
3040                                   that needs to be removed. We're not
3041                                   allowed to remove it directly
3042                                   however, so we instead setup a
3043                                   modify to delete the corresponding
3044                                   forward link
3045                                  */
3046                                 ret = replmd_delete_remove_link(module, schema, old_dn, el, sa, req);
3047                                 if (ret != LDB_SUCCESS) {
3048                                         talloc_free(tmp_ctx);
3049                                         return LDB_ERR_OPERATIONS_ERROR;
3050                                 }
3051                                 /* now we continue, which means we
3052                                    won't remove this backlink
3053                                    directly
3054                                 */
3055                                 continue;
3056                         }
3057                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
3058                                 continue;
3059                         }
3060                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
3061                         if (ret != LDB_SUCCESS) {
3062                                 talloc_free(tmp_ctx);
3063                                 ldb_module_oom(module);
3064                                 return ret;
3065                         }
3066                 }
3067                 break;
3068
3069         default:
3070                 break;
3071         }
3072
3073         if (deletion_state == OBJECT_NOT_DELETED) {
3074                 const struct dsdb_attribute *sa;
3075
3076                 /* work out what the new rdn value is, for updating the
3077                    rDN and name fields */
3078                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
3079                 if (new_rdn_value == NULL) {
3080                         talloc_free(tmp_ctx);
3081                         return ldb_operr(ldb);
3082                 }
3083
3084                 sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
3085                 if (!sa) {
3086                         talloc_free(tmp_ctx);
3087                         return LDB_ERR_OPERATIONS_ERROR;
3088                 }
3089
3090                 ret = ldb_msg_add_value(msg, sa->lDAPDisplayName, new_rdn_value,
3091                                         &el);
3092                 if (ret != LDB_SUCCESS) {
3093                         talloc_free(tmp_ctx);
3094                         return ret;
3095                 }
3096                 el->flags = LDB_FLAG_MOD_REPLACE;
3097
3098                 el = ldb_msg_find_element(old_msg, "name");
3099                 if (el) {
3100                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
3101                         if (ret != LDB_SUCCESS) {
3102                                 talloc_free(tmp_ctx);
3103                                 return ret;
3104                         }
3105                         el->flags = LDB_FLAG_MOD_REPLACE;
3106                 }
3107         }
3108
3109         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE, req);
3110         if (ret != LDB_SUCCESS) {
3111                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
3112                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
3113                 talloc_free(tmp_ctx);
3114                 return ret;
3115         }
3116
3117         if (deletion_state == OBJECT_NOT_DELETED) {
3118                 /* now rename onto the new DN */
3119                 ret = dsdb_module_rename(module, old_dn, new_dn, DSDB_FLAG_NEXT_MODULE, req);
3120                 if (ret != LDB_SUCCESS){
3121                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
3122                                  ldb_dn_get_linearized(old_dn),
3123                                  ldb_dn_get_linearized(new_dn),
3124                                  ldb_errstring(ldb)));
3125                         talloc_free(tmp_ctx);
3126                         return ret;
3127                 }
3128         }
3129
3130         talloc_free(tmp_ctx);
3131
3132         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
3133 }
3134
3135
3136
3137 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
3138 {
3139         return ret;
3140 }
3141
3142 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
3143 {
3144         int ret = LDB_ERR_OTHER;
3145         /* TODO: do some error mapping */
3146         return ret;
3147 }
3148
3149
3150 static struct replPropertyMetaData1 *
3151 replmd_replPropertyMetaData1_find_attid(struct replPropertyMetaDataBlob *md_blob,
3152                                         enum drsuapi_DsAttributeId attid)
3153 {
3154         uint32_t i;
3155         struct replPropertyMetaDataCtr1 *rpmd_ctr = &md_blob->ctr.ctr1;
3156
3157         for (i = 0; i < rpmd_ctr->count; i++) {
3158                 if (rpmd_ctr->array[i].attid == attid) {
3159                         return &rpmd_ctr->array[i];
3160                 }
3161         }
3162         return NULL;
3163 }
3164
3165
3166 /*
3167    return true if an update is newer than an existing entry
3168    see section 5.11 of MS-ADTS
3169 */
3170 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
3171                                    const struct GUID *update_invocation_id,
3172                                    uint32_t current_version,
3173                                    uint32_t update_version,
3174                                    NTTIME current_change_time,
3175                                    NTTIME update_change_time)
3176 {
3177         if (update_version != current_version) {
3178                 return update_version > current_version;
3179         }
3180         if (update_change_time != current_change_time) {
3181                 return update_change_time > current_change_time;
3182         }
3183         return GUID_compare(update_invocation_id, current_invocation_id) > 0;
3184 }
3185
3186 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
3187                                                   struct replPropertyMetaData1 *new_m)
3188 {
3189         return replmd_update_is_newer(&cur_m->originating_invocation_id,
3190                                       &new_m->originating_invocation_id,
3191                                       cur_m->version,
3192                                       new_m->version,
3193                                       cur_m->originating_change_time,
3194                                       new_m->originating_change_time);
3195 }
3196
3197
3198 /*
3199   form a conflict DN
3200  */
3201 static struct ldb_dn *replmd_conflict_dn(TALLOC_CTX *mem_ctx, struct ldb_dn *dn, struct GUID *guid)
3202 {
3203         const struct ldb_val *rdn_val;
3204         const char *rdn_name;
3205         struct ldb_dn *new_dn;
3206
3207         rdn_val = ldb_dn_get_rdn_val(dn);
3208         rdn_name = ldb_dn_get_rdn_name(dn);
3209         if (!rdn_val || !rdn_name) {
3210                 return NULL;
3211         }
3212
3213         new_dn = ldb_dn_copy(mem_ctx, dn);
3214         if (!new_dn) {
3215                 return NULL;
3216         }
3217
3218         if (!ldb_dn_remove_child_components(new_dn, 1)) {
3219                 return NULL;
3220         }
3221
3222         if (!ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ACNF:%s",
3223                                   rdn_name,
3224                                   ldb_dn_escape_value(new_dn, *rdn_val),
3225                                   GUID_string(new_dn, guid))) {
3226                 return NULL;
3227         }
3228
3229         return new_dn;
3230 }
3231
3232
3233 /*
3234   perform a modify operation which sets the rDN and name attributes to
3235   their current values. This has the effect of changing these
3236   attributes to have been last updated by the current DC. This is
3237   needed to ensure that renames performed as part of conflict
3238   resolution are propogated to other DCs
3239  */
3240 static int replmd_name_modify(struct replmd_replicated_request *ar,
3241                               struct ldb_request *req, struct ldb_dn *dn)
3242 {
3243         struct ldb_message *msg;
3244         const char *rdn_name;
3245         const struct ldb_val *rdn_val;
3246         const struct dsdb_attribute *rdn_attr;
3247         int ret;
3248
3249         msg = ldb_msg_new(req);
3250         if (msg == NULL) {
3251                 goto failed;
3252         }
3253         msg->dn = dn;
3254
3255         rdn_name = ldb_dn_get_rdn_name(dn);
3256         if (rdn_name == NULL) {
3257                 goto failed;
3258         }
3259
3260         /* normalize the rdn attribute name */
3261         rdn_attr = dsdb_attribute_by_lDAPDisplayName(ar->schema, rdn_name);
3262         if (rdn_attr == NULL) {
3263                 goto failed;
3264         }
3265         rdn_name = rdn_attr->lDAPDisplayName;
3266
3267         rdn_val = ldb_dn_get_rdn_val(dn);
3268         if (rdn_val == NULL) {
3269                 goto failed;
3270         }
3271
3272         if (ldb_msg_add_empty(msg, rdn_name, LDB_FLAG_MOD_REPLACE, NULL) != 0) {
3273                 goto failed;
3274         }
3275         if (ldb_msg_add_value(msg, rdn_name, rdn_val, NULL) != 0) {
3276                 goto failed;
3277         }
3278         if (ldb_msg_add_empty(msg, "name", LDB_FLAG_MOD_REPLACE, NULL) != 0) {
3279                 goto failed;
3280         }
3281         if (ldb_msg_add_value(msg, "name", rdn_val, NULL) != 0) {
3282                 goto failed;
3283         }
3284
3285         ret = dsdb_module_modify(ar->module, msg, DSDB_FLAG_OWN_MODULE, req);
3286         if (ret != LDB_SUCCESS) {
3287                 DEBUG(0,(__location__ ": Failed to modify rDN/name of conflict DN '%s' - %s",
3288                          ldb_dn_get_linearized(dn),
3289                          ldb_errstring(ldb_module_get_ctx(ar->module))));
3290                 return ret;
3291         }
3292
3293         talloc_free(msg);
3294
3295         return LDB_SUCCESS;
3296
3297 failed:
3298         talloc_free(msg);
3299         DEBUG(0,(__location__ ": Failed to setup modify rDN/name of conflict DN '%s'",
3300                  ldb_dn_get_linearized(dn)));
3301         return LDB_ERR_OPERATIONS_ERROR;
3302 }
3303
3304
3305 /*
3306   callback for conflict DN handling where we have renamed the incoming
3307   record. After renaming it, we need to ensure the change of name and
3308   rDN for the incoming record is seen as an originating update by this DC.
3309  */
3310 static int replmd_op_name_modify_callback(struct ldb_request *req, struct ldb_reply *ares)
3311 {
3312         struct replmd_replicated_request *ar =
3313                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
3314         int ret;
3315
3316         if (ares->error != LDB_SUCCESS) {
3317                 /* call the normal callback for everything except success */
3318                 return replmd_op_callback(req, ares);
3319         }
3320
3321         /* perform a modify of the rDN and name of the record */
3322         ret = replmd_name_modify(ar, req, req->op.add.message->dn);
3323         if (ret != LDB_SUCCESS) {
3324                 ares->error = ret;
3325                 return replmd_op_callback(req, ares);
3326         }
3327
3328         return replmd_op_callback(req, ares);
3329 }
3330
3331 /*
3332   callback for replmd_replicated_apply_add()
3333   This copes with the creation of conflict records in the case where
3334   the DN exists, but with a different objectGUID
3335  */
3336 static int replmd_op_add_callback(struct ldb_request *req, struct ldb_reply *ares)
3337 {
3338         struct ldb_dn *conflict_dn;
3339         struct replmd_replicated_request *ar =
3340                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
3341         struct ldb_result *res;
3342         const char *attrs[] = { "replPropertyMetaData", "objectGUID", NULL };
3343         int ret;
3344         const struct ldb_val *rmd_value, *omd_value;
3345         struct replPropertyMetaDataBlob omd, rmd;
3346         enum ndr_err_code ndr_err;
3347         bool rename_incoming_record, rodc;
3348         struct replPropertyMetaData1 *rmd_name, *omd_name;
3349
3350         if (ares->error != LDB_ERR_ENTRY_ALREADY_EXISTS) {
3351                 /* call the normal callback for everything except
3352                    conflicts */
3353                 return replmd_op_callback(req, ares);
3354         }
3355
3356         ret = samdb_rodc(ldb_module_get_ctx(ar->module), &rodc);
3357         if (ret != LDB_SUCCESS) {
3358                 return ret;
3359         }
3360         /*
3361          * we have a conflict, and need to decide if we will keep the
3362          * new record or the old record
3363          */
3364         conflict_dn = req->op.add.message->dn;
3365
3366         if (rodc) {
3367                 /*
3368                  * We are on an RODC, or were a GC for this
3369                  * partition, so we have to fail this until
3370                  * someone who owns the partition sorts it
3371                  * out
3372                  */
3373                 ldb_asprintf_errstring(ldb_module_get_ctx(ar->module),
3374                                        "Conflict adding object '%s' from incoming replication as we are read only for the partition.  \n"
3375                                        " - We must fail the operation until a master for this partition resolves the conflict",
3376                                        ldb_dn_get_linearized(conflict_dn));
3377                 goto failed;
3378         }
3379
3380         /*
3381          * we have a conflict, and need to decide if we will keep the
3382          * new record or the old record
3383          */
3384         conflict_dn = req->op.add.message->dn;
3385
3386         /*
3387          * first we need the replPropertyMetaData attribute from the
3388          * old record
3389          */
3390         ret = dsdb_module_search_dn(ar->module, req, &res, conflict_dn,
3391                                     attrs,
3392                                     DSDB_FLAG_NEXT_MODULE |
3393                                     DSDB_SEARCH_SHOW_DELETED |
3394                                     DSDB_SEARCH_SHOW_RECYCLED, req);
3395         if (ret != LDB_SUCCESS) {
3396                 DEBUG(0,(__location__ ": Unable to find object for conflicting record '%s'\n",
3397                          ldb_dn_get_linearized(conflict_dn)));
3398                 goto failed;
3399         }
3400
3401         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
3402         if (omd_value == NULL) {
3403                 DEBUG(0,(__location__ ": Unable to find replPropertyMetaData for conflicting record '%s'\n",
3404                          ldb_dn_get_linearized(conflict_dn)));
3405                 goto failed;
3406         }
3407
3408         ndr_err = ndr_pull_struct_blob(omd_value, res->msgs[0], &omd,
3409                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
3410         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3411                 DEBUG(0,(__location__ ": Failed to parse old replPropertyMetaData for %s\n",
3412                          ldb_dn_get_linearized(conflict_dn)));
3413                 goto failed;
3414         }
3415
3416         /*
3417          * and the replPropertyMetaData attribute from the
3418          * new record
3419          */
3420         rmd_value = ldb_msg_find_ldb_val(req->op.add.message, "replPropertyMetaData");
3421         if (rmd_value == NULL) {
3422                 DEBUG(0,(__location__ ": Unable to find replPropertyMetaData for new record '%s'\n",
3423                          ldb_dn_get_linearized(conflict_dn)));
3424                 goto failed;
3425         }
3426
3427         ndr_err = ndr_pull_struct_blob(rmd_value, req, &rmd,
3428                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
3429         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3430                 DEBUG(0,(__location__ ": Failed to parse new replPropertyMetaData for %s\n",
3431                          ldb_dn_get_linearized(conflict_dn)));
3432                 goto failed;
3433         }
3434
3435         /* we decide which is newer based on the RPMD on the name
3436            attribute.  See [MS-DRSR] ResolveNameConflict */
3437         rmd_name = replmd_replPropertyMetaData1_find_attid(&rmd, DRSUAPI_ATTID_name);
3438         omd_name = replmd_replPropertyMetaData1_find_attid(&omd, DRSUAPI_ATTID_name);
3439         if (!rmd_name || !omd_name) {
3440                 DEBUG(0,(__location__ ": Failed to find name attribute in replPropertyMetaData for %s\n",
3441                          ldb_dn_get_linearized(conflict_dn)));
3442                 goto failed;
3443         }
3444
3445         rename_incoming_record = !replmd_replPropertyMetaData1_is_newer(omd_name, rmd_name);
3446
3447         if (rename_incoming_record) {
3448                 struct GUID guid;
3449                 struct ldb_dn *new_dn;
3450                 struct ldb_message *new_msg;
3451
3452                 guid = samdb_result_guid(req->op.add.message, "objectGUID");
3453                 if (GUID_all_zero(&guid)) {
3454                         DEBUG(0,(__location__ ": Failed to find objectGUID for conflicting incoming record %s\n",
3455                                  ldb_dn_get_linearized(conflict_dn)));
3456                         goto failed;
3457                 }
3458                 new_dn = replmd_conflict_dn(req, conflict_dn, &guid);
3459                 if (new_dn == NULL) {
3460                         DEBUG(0,(__location__ ": Failed to form conflict DN for %s\n",
3461                                  ldb_dn_get_linearized(conflict_dn)));
3462                         goto failed;
3463                 }
3464
3465                 DEBUG(1,(__location__ ": Resolving conflict record via incoming rename '%s' -> '%s'\n",
3466                          ldb_dn_get_linearized(conflict_dn), ldb_dn_get_linearized(new_dn)));
3467
3468                 /* re-submit the request, but with a different
3469                    callback, so we don't loop forever. */
3470                 new_msg = ldb_msg_copy_shallow(req, req->op.add.message);
3471                 if (!new_msg) {
3472                         goto failed;
3473                         DEBUG(0,(__location__ ": Failed to copy conflict DN message for %s\n",
3474                                  ldb_dn_get_linearized(conflict_dn)));
3475                 }
3476                 new_msg->dn = new_dn;
3477                 req->op.add.message = new_msg;
3478                 req->callback = replmd_op_name_modify_callback;
3479
3480                 return ldb_next_request(ar->module, req);
3481         } else {
3482                 /* we are renaming the existing record */
3483                 struct GUID guid;
3484                 struct ldb_dn *new_dn;
3485
3486                 guid = samdb_result_guid(res->msgs[0], "objectGUID");
3487                 if (GUID_all_zero(&guid)) {
3488                         DEBUG(0,(__location__ ": Failed to find objectGUID for existing conflict record %s\n",
3489                                  ldb_dn_get_linearized(conflict_dn)));
3490                         goto failed;
3491                 }
3492
3493                 new_dn = replmd_conflict_dn(req, conflict_dn, &guid);
3494                 if (new_dn == NULL) {
3495                         DEBUG(0,(__location__ ": Failed to form conflict DN for %s\n",
3496                                  ldb_dn_get_linearized(conflict_dn)));
3497                         goto failed;
3498                 }
3499
3500                 DEBUG(1,(__location__ ": Resolving conflict record via existing rename '%s' -> '%s'\n",
3501                          ldb_dn_get_linearized(conflict_dn), ldb_dn_get_linearized(new_dn)));
3502
3503                 ret = dsdb_module_rename(ar->module, conflict_dn, new_dn,
3504                                          DSDB_FLAG_OWN_MODULE, req);
3505                 if (ret != LDB_SUCCESS) {
3506                         DEBUG(0,(__location__ ": Failed to rename conflict dn '%s' to '%s' - %s\n",
3507                                  ldb_dn_get_linearized(conflict_dn),
3508                                  ldb_dn_get_linearized(new_dn),
3509                                  ldb_errstring(ldb_module_get_ctx(ar->module))));
3510                         goto failed;
3511                 }
3512
3513                 /*
3514                  * now we need to ensure that the rename is seen as an
3515                  * originating update. We do that with a modify.
3516                  */
3517                 ret = replmd_name_modify(ar, req, new_dn);
3518                 if (ret != LDB_SUCCESS) {
3519                         goto failed;
3520                 }
3521
3522                 req->callback = replmd_op_callback;
3523
3524                 return ldb_next_request(ar->module, req);
3525         }
3526
3527 failed:
3528         /* on failure do the original callback. This means replication
3529          * will stop with an error, but there is not much else we can
3530          * do
3531          */
3532         return replmd_op_callback(req, ares);
3533 }
3534
3535 /*
3536   this is called when a new object comes in over DRS
3537  */
3538 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
3539 {
3540         struct ldb_context *ldb;
3541         struct ldb_request *change_req;
3542         enum ndr_err_code ndr_err;
3543         struct ldb_message *msg;
3544         struct replPropertyMetaDataBlob *md;
3545         struct ldb_val md_value;
3546         unsigned int i;
3547         int ret;
3548
3549         /*
3550          * TODO: check if the parent object exist
3551          */
3552
3553         /*
3554          * TODO: handle the conflict case where an object with the
3555          *       same name exist
3556          */
3557
3558         ldb = ldb_module_get_ctx(ar->module);
3559         msg = ar->objs->objects[ar->index_current].msg;
3560         md = ar->objs->objects[ar->index_current].meta_data;
3561
3562         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
3563         if (ret != LDB_SUCCESS) {
3564                 return replmd_replicated_request_error(ar, ret);
3565         }
3566
3567         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
3568         if (ret != LDB_SUCCESS) {
3569                 return replmd_replicated_request_error(ar, ret);
3570         }
3571
3572         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
3573         if (ret != LDB_SUCCESS) {
3574                 return replmd_replicated_request_error(ar, ret);
3575         }
3576
3577         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
3578         if (ret != LDB_SUCCESS) {
3579                 return replmd_replicated_request_error(ar, ret);
3580         }
3581
3582         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
3583         if (ret != LDB_SUCCESS) {
3584                 return replmd_replicated_request_error(ar, ret);
3585         }
3586
3587         /* remove any message elements that have zero values */
3588         for (i=0; i<msg->num_elements; i++) {
3589                 struct ldb_message_element *el = &msg->elements[i];
3590
3591                 if (el->num_values == 0) {
3592                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
3593                                  el->name));
3594                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
3595                         msg->num_elements--;
3596                         i--;
3597                         continue;
3598                 }
3599         }
3600
3601         /*
3602          * the meta data array is already sorted by the caller
3603          */
3604         for (i=0; i < md->ctr.ctr1.count; i++) {
3605                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
3606         }
3607         ndr_err = ndr_push_struct_blob(&md_value, msg, md,
3608                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
3609         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3610                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3611                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3612         }
3613         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
3614         if (ret != LDB_SUCCESS) {
3615                 return replmd_replicated_request_error(ar, ret);
3616         }
3617
3618         replmd_ldb_message_sort(msg, ar->schema);
3619
3620         if (DEBUGLVL(4)) {
3621                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
3622                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
3623                 talloc_free(s);
3624         }
3625
3626         ret = ldb_build_add_req(&change_req,
3627                                 ldb,
3628                                 ar,
3629                                 msg,
3630                                 ar->controls,
3631                                 ar,
3632                                 replmd_op_add_callback,
3633                                 ar->req);
3634         LDB_REQ_SET_LOCATION(change_req);
3635         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3636
3637         /* current partition control needed by "repmd_op_callback" */
3638         ret = ldb_request_add_control(change_req,
3639                                       DSDB_CONTROL_CURRENT_PARTITION_OID,
3640                                       false, NULL);
3641         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3642
3643         if (ar->objs->dsdb_repl_flags & DSDB_REPL_FLAG_PARTIAL_REPLICA) {
3644                 /* this tells the partition module to make it a
3645                    partial replica if creating an NC */
3646                 ret = ldb_request_add_control(change_req,
3647                                               DSDB_CONTROL_PARTIAL_REPLICA,
3648                                               false, NULL);
3649                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3650         }
3651
3652         return ldb_next_request(ar->module, change_req);
3653 }
3654
3655 /*
3656   handle renames that come in over DRS replication
3657  */
3658 static int replmd_replicated_handle_rename(struct replmd_replicated_request *ar,
3659                                            struct ldb_message *msg,
3660                                            struct replPropertyMetaDataBlob *rmd,
3661                                            struct replPropertyMetaDataBlob *omd,
3662                                            struct ldb_request *parent)
3663 {
3664         struct replPropertyMetaData1 *md_remote;
3665         struct replPropertyMetaData1 *md_local;
3666
3667         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) == 0) {
3668                 /* no rename */
3669                 return LDB_SUCCESS;
3670         }
3671
3672         /* now we need to check for double renames. We could have a
3673          * local rename pending which our replication partner hasn't
3674          * received yet. We choose which one wins by looking at the
3675          * attribute stamps on the two objects, the newer one wins
3676          */
3677         md_remote = replmd_replPropertyMetaData1_find_attid(rmd, DRSUAPI_ATTID_name);
3678         md_local  = replmd_replPropertyMetaData1_find_attid(omd, DRSUAPI_ATTID_name);
3679         /* if there is no name attribute then we have to assume the
3680            object we've received is in fact newer */
3681         if (!md_remote || !md_local ||
3682             replmd_replPropertyMetaData1_is_newer(md_local, md_remote)) {
3683                 DEBUG(4,("replmd_replicated_request rename %s => %s\n",
3684                          ldb_dn_get_linearized(ar->search_msg->dn),
3685                          ldb_dn_get_linearized(msg->dn)));
3686                 /* pass rename to the next module
3687                  * so it doesn't appear as an originating update */
3688                 return dsdb_module_rename(ar->module,
3689                                           ar->search_msg->dn, msg->dn,
3690                                           DSDB_FLAG_NEXT_MODULE | DSDB_MODIFY_RELAX, parent);
3691         }
3692
3693         /* we're going to keep our old object */
3694         DEBUG(4,(__location__ ": Keeping object %s and rejecting older rename to %s\n",
3695                  ldb_dn_get_linearized(ar->search_msg->dn),
3696                  ldb_dn_get_linearized(msg->dn)));
3697         return LDB_SUCCESS;
3698 }
3699
3700
3701 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
3702 {
3703         struct ldb_context *ldb;
3704         struct ldb_request *change_req;
3705         enum ndr_err_code ndr_err;
3706         struct ldb_message *msg;
3707         struct replPropertyMetaDataBlob *rmd;
3708         struct replPropertyMetaDataBlob omd;
3709         const struct ldb_val *omd_value;
3710         struct replPropertyMetaDataBlob nmd;
3711         struct ldb_val nmd_value;
3712         unsigned int i;
3713         uint32_t j,ni=0;
3714         unsigned int removed_attrs = 0;
3715         int ret;
3716
3717         ldb = ldb_module_get_ctx(ar->module);
3718         msg = ar->objs->objects[ar->index_current].msg;
3719         rmd = ar->objs->objects[ar->index_current].meta_data;
3720         ZERO_STRUCT(omd);
3721         omd.version = 1;
3722
3723         /* find existing meta data */
3724         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
3725         if (omd_value) {
3726                 ndr_err = ndr_pull_struct_blob(omd_value, ar, &omd,
3727                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
3728                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3729                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3730                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3731                 }
3732
3733                 if (omd.version != 1) {
3734                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3735                 }
3736         }
3737
3738         /* handle renames that come in over DRS */
3739         ret = replmd_replicated_handle_rename(ar, msg, rmd, &omd, ar->req);
3740         if (ret != LDB_SUCCESS) {
3741                 ldb_debug(ldb, LDB_DEBUG_FATAL,
3742                           "replmd_replicated_request rename %s => %s failed - %s\n",
3743                           ldb_dn_get_linearized(ar->search_msg->dn),
3744                           ldb_dn_get_linearized(msg->dn),
3745                           ldb_errstring(ldb));
3746                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
3747         }
3748
3749         ZERO_STRUCT(nmd);
3750         nmd.version = 1;
3751         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
3752         nmd.ctr.ctr1.array = talloc_array(ar,
3753                                           struct replPropertyMetaData1,
3754                                           nmd.ctr.ctr1.count);
3755         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3756
3757         /* first copy the old meta data */
3758         for (i=0; i < omd.ctr.ctr1.count; i++) {
3759                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
3760                 ni++;
3761         }
3762
3763         ar->seq_num = 0;
3764         /* now merge in the new meta data */
3765         for (i=0; i < rmd->ctr.ctr1.count; i++) {
3766                 bool found = false;
3767
3768                 for (j=0; j < ni; j++) {
3769                         bool cmp;
3770
3771                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
3772                                 continue;
3773                         }
3774
3775                         if (ar->objs->dsdb_repl_flags & DSDB_REPL_FLAG_PRIORITISE_INCOMING) {
3776                                 /* if we compare equal then do an
3777                                    update. This is used when a client
3778                                    asks for a FULL_SYNC, and can be
3779                                    used to recover a corrupt
3780                                    replica */
3781                                 cmp = !replmd_replPropertyMetaData1_is_newer(&rmd->ctr.ctr1.array[i],
3782                                                                              &nmd.ctr.ctr1.array[j]);
3783                         } else {
3784                                 cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
3785                                                                             &rmd->ctr.ctr1.array[i]);
3786                         }
3787                         if (cmp) {
3788                                 /* replace the entry */
3789                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
3790                                 if (ar->seq_num == 0) {
3791                                         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
3792                                         if (ret != LDB_SUCCESS) {
3793                                                 return replmd_replicated_request_error(ar, ret);
3794                                         }
3795                                 }
3796                                 nmd.ctr.ctr1.array[j].local_usn = ar->seq_num;
3797                                 found = true;
3798                                 break;
3799                         }
3800
3801                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTID_instanceType) {
3802                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
3803                                          msg->elements[i-removed_attrs].name,
3804                                          ldb_dn_get_linearized(msg->dn),
3805                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
3806                         }
3807
3808                         /* we don't want to apply this change so remove the attribute */
3809                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
3810                         removed_attrs++;
3811
3812                         found = true;
3813                         break;
3814                 }
3815
3816                 if (found) continue;
3817
3818                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
3819                 if (ar->seq_num == 0) {
3820                         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
3821                         if (ret != LDB_SUCCESS) {
3822                                 return replmd_replicated_request_error(ar, ret);
3823                         }
3824                 }
3825                 nmd.ctr.ctr1.array[ni].local_usn = ar->seq_num;
3826                 ni++;
3827         }
3828
3829         /*
3830          * finally correct the size of the meta_data array
3831          */
3832         nmd.ctr.ctr1.count = ni;
3833
3834         /*
3835          * the rdn attribute (the alias for the name attribute),
3836          * 'cn' for most objects is the last entry in the meta data array
3837          * we have stored
3838          *
3839          * sort the new meta data array
3840          */
3841         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
3842         if (ret != LDB_SUCCESS) {
3843                 return ret;
3844         }
3845
3846         /*
3847          * check if some replicated attributes left, otherwise skip the ldb_modify() call
3848          */
3849         if (msg->num_elements == 0) {
3850                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
3851                           ar->index_current);
3852
3853                 ar->index_current++;
3854                 return replmd_replicated_apply_next(ar);
3855         }
3856
3857         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
3858                   ar->index_current, msg->num_elements);
3859
3860         /* create the meta data value */
3861         ndr_err = ndr_push_struct_blob(&nmd_value, msg, &nmd,
3862                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
3863         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3864                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3865                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3866         }
3867
3868         /*
3869          * when we know that we'll modify the record, add the whenChanged, uSNChanged
3870          * and replPopertyMetaData attributes
3871          */
3872         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
3873         if (ret != LDB_SUCCESS) {
3874                 return replmd_replicated_request_error(ar, ret);
3875         }
3876         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
3877         if (ret != LDB_SUCCESS) {
3878                 return replmd_replicated_request_error(ar, ret);
3879         }
3880         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
3881         if (ret != LDB_SUCCESS) {
3882                 return replmd_replicated_request_error(ar, ret);
3883         }
3884
3885         replmd_ldb_message_sort(msg, ar->schema);
3886
3887         /* we want to replace the old values */
3888         for (i=0; i < msg->num_elements; i++) {
3889                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
3890         }
3891
3892         if (DEBUGLVL(4)) {
3893                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3894                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
3895                 talloc_free(s);
3896         }
3897
3898         ret = ldb_build_mod_req(&change_req,
3899                                 ldb,
3900                                 ar,
3901                                 msg,
3902                                 ar->controls,
3903                                 ar,
3904                                 replmd_op_callback,
3905                                 ar->req);
3906         LDB_REQ_SET_LOCATION(change_req);
3907         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3908
3909         /* current partition control needed by "repmd_op_callback" */
3910         ret = ldb_request_add_control(change_req,
3911                                       DSDB_CONTROL_CURRENT_PARTITION_OID,
3912                                       false, NULL);
3913         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3914
3915         return ldb_next_request(ar->module, change_req);
3916 }
3917
3918 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
3919                                                    struct ldb_reply *ares)
3920 {
3921         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3922                                                struct replmd_replicated_request);
3923         int ret;
3924
3925         if (!ares) {
3926                 return ldb_module_done(ar->req, NULL, NULL,
3927                                         LDB_ERR_OPERATIONS_ERROR);
3928         }
3929         if (ares->error != LDB_SUCCESS &&
3930             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3931                 return ldb_module_done(ar->req, ares->controls,
3932                                         ares->response, ares->error);
3933         }
3934
3935         switch (ares->type) {
3936         case LDB_REPLY_ENTRY:
3937                 ar->search_msg = talloc_steal(ar, ares->message);
3938                 break;
3939
3940         case LDB_REPLY_REFERRAL:
3941                 /* we ignore referrals */
3942                 break;
3943
3944         case LDB_REPLY_DONE:
3945                 if (ar->search_msg != NULL) {
3946                         ret = replmd_replicated_apply_merge(ar);
3947                 } else {
3948                         ret = replmd_replicated_apply_add(ar);
3949                 }
3950                 if (ret != LDB_SUCCESS) {
3951                         return ldb_module_done(ar->req, NULL, NULL, ret);
3952                 }
3953         }
3954
3955         talloc_free(ares);
3956         return LDB_SUCCESS;
3957 }
3958
3959 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
3960
3961 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
3962 {
3963         struct ldb_context *ldb;
3964         int ret;
3965         char *tmp_str;
3966         char *filter;
3967         struct ldb_request *search_req;
3968         struct ldb_search_options_control *options;
3969
3970         if (ar->index_current >= ar->objs->num_objects) {
3971                 /* done with it, go to next stage */
3972                 return replmd_replicated_uptodate_vector(ar);
3973         }
3974
3975         ldb = ldb_module_get_ctx(ar->module);
3976         ar->search_msg = NULL;
3977
3978         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
3979         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3980
3981         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
3982         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3983         talloc_free(tmp_str);
3984
3985         ret = ldb_build_search_req(&search_req,
3986                                    ldb,
3987                                    ar,
3988                                    NULL,
3989                                    LDB_SCOPE_SUBTREE,
3990                                    filter,
3991                                    NULL,
3992                                    NULL,
3993                                    ar,
3994                                    replmd_replicated_apply_search_callback,
3995                                    ar->req);
3996         LDB_REQ_SET_LOCATION(search_req);
3997
3998         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_RECYCLED_OID,
3999                                       true, NULL);
4000         if (ret != LDB_SUCCESS) {
4001                 return ret;
4002         }
4003
4004         /* we need to cope with cross-partition links, so search for
4005            the GUID over all partitions */
4006         options = talloc(search_req, struct ldb_search_options_control);
4007         if (options == NULL) {
4008                 DEBUG(0, (__location__ ": out of memory\n"));
4009                 return LDB_ERR_OPERATIONS_ERROR;
4010         }
4011         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
4012
4013         ret = ldb_request_add_control(search_req,
4014                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
4015                                       true, options);
4016         if (ret != LDB_SUCCESS) {
4017                 return ret;
4018         }
4019
4020         return ldb_next_request(ar->module, search_req);
4021 }
4022
4023 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
4024                                                       struct ldb_reply *ares)
4025 {
4026         struct ldb_context *ldb;
4027         struct replmd_replicated_request *ar = talloc_get_type(req->context,
4028                                                struct replmd_replicated_request);
4029         ldb = ldb_module_get_ctx(ar->module);
4030
4031         if (!ares) {
4032                 return ldb_module_done(ar->req, NULL, NULL,
4033                                         LDB_ERR_OPERATIONS_ERROR);
4034         }
4035         if (ares->error != LDB_SUCCESS) {
4036                 return ldb_module_done(ar->req, ares->controls,
4037                                         ares->response, ares->error);
4038         }
4039
4040         if (ares->type != LDB_REPLY_DONE) {
4041                 ldb_asprintf_errstring(ldb, "Invalid LDB reply type %d", ares->type);
4042                 return ldb_module_done(ar->req, NULL, NULL,
4043                                         LDB_ERR_OPERATIONS_ERROR);
4044         }
4045
4046         talloc_free(ares);
4047
4048         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
4049 }
4050
4051 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
4052 {
4053         struct ldb_context *ldb;
4054         struct ldb_request *change_req;
4055         enum ndr_err_code ndr_err;
4056         struct ldb_message *msg;
4057         struct replUpToDateVectorBlob ouv;
4058         const struct ldb_val *ouv_value;
4059         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
4060         struct replUpToDateVectorBlob nuv;
4061         struct ldb_val nuv_value;
4062         struct ldb_message_element *nuv_el = NULL;
4063         const struct GUID *our_invocation_id;
4064         struct ldb_message_element *orf_el = NULL;
4065         struct repsFromToBlob nrf;
4066         struct ldb_val *nrf_value = NULL;
4067         struct ldb_message_element *nrf_el = NULL;
4068         unsigned int i;
4069         uint32_t j,ni=0;
4070         bool found = false;
4071         time_t t = time(NULL);
4072         NTTIME now;
4073         int ret;
4074         uint32_t instanceType;
4075
4076         ldb = ldb_module_get_ctx(ar->module);
4077         ruv = ar->objs->uptodateness_vector;
4078         ZERO_STRUCT(ouv);
4079         ouv.version = 2;
4080         ZERO_STRUCT(nuv);
4081         nuv.version = 2;
4082
4083         unix_to_nt_time(&now, t);
4084
4085         if (ar->search_msg == NULL) {
4086                 /* this happens for a REPL_OBJ call where we are
4087                    creating the target object by replicating it. The
4088                    subdomain join code does this for the partition DN
4089                 */
4090                 DEBUG(4,(__location__ ": Skipping UDV and repsFrom update as no target DN\n"));
4091                 return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
4092         }
4093
4094         instanceType = ldb_msg_find_attr_as_uint(ar->search_msg, "instanceType", 0);
4095         if (! (instanceType & INSTANCE_TYPE_IS_NC_HEAD)) {
4096                 DEBUG(4,(__location__ ": Skipping UDV and repsFrom update as not NC root: %s\n",
4097                          ldb_dn_get_linearized(ar->search_msg->dn)));
4098                 return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
4099         }
4100
4101         /*
4102          * first create the new replUpToDateVector
4103          */
4104         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
4105         if (ouv_value) {
4106                 ndr_err = ndr_pull_struct_blob(ouv_value, ar, &ouv,
4107                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
4108                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4109                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4110                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4111                 }
4112
4113                 if (ouv.version != 2) {
4114                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
4115                 }
4116         }
4117
4118         /*
4119          * the new uptodateness vector will at least
4120          * contain 1 entry, one for the source_dsa
4121          *
4122          * plus optional values from our old vector and the one from the source_dsa
4123          */
4124         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
4125         if (ruv) nuv.ctr.ctr2.count += ruv->count;
4126         nuv.ctr.ctr2.cursors = talloc_array(ar,
4127                                             struct drsuapi_DsReplicaCursor2,
4128                                             nuv.ctr.ctr2.count);
4129         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4130
4131         /* first copy the old vector */
4132         for (i=0; i < ouv.ctr.ctr2.count; i++) {
4133                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
4134                 ni++;
4135         }
4136
4137         /* get our invocation_id if we have one already attached to the ldb */
4138         our_invocation_id = samdb_ntds_invocation_id(ldb);
4139
4140         /* merge in the source_dsa vector is available */
4141         for (i=0; (ruv && i < ruv->count); i++) {
4142                 found = false;
4143
4144                 if (our_invocation_id &&
4145                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
4146                                our_invocation_id)) {
4147                         continue;
4148                 }
4149
4150                 for (j=0; j < ni; j++) {
4151                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
4152                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
4153                                 continue;
4154                         }
4155
4156                         found = true;
4157
4158                         /*
4159                          * we update only the highest_usn and not the latest_sync_success time,
4160                          * because the last success stands for direct replication
4161                          */
4162                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
4163                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
4164                         }
4165                         break;
4166                 }
4167
4168                 if (found) continue;
4169
4170                 /* if it's not there yet, add it */
4171                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
4172                 ni++;
4173         }
4174
4175         /*
4176          * merge in the current highwatermark for the source_dsa
4177          */
4178         found = false;
4179         for (j=0; j < ni; j++) {
4180                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
4181                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
4182                         continue;
4183                 }
4184
4185                 found = true;
4186
4187                 /*
4188                  * here we update the highest_usn and last_sync_success time
4189                  * because we're directly replicating from the source_dsa
4190                  *
4191                  * and use the tmp_highest_usn because this is what we have just applied
4192                  * to our ldb
4193                  */
4194                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
4195                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
4196                 break;
4197         }
4198         if (!found) {
4199                 /*
4200                  * here we update the highest_usn and last_sync_success time
4201                  * because we're directly replicating from the source_dsa
4202                  *
4203                  * and use the tmp_highest_usn because this is what we have just applied
4204                  * to our ldb
4205                  */
4206                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
4207                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
4208                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
4209                 ni++;
4210         }
4211
4212         /*
4213          * finally correct the size of the cursors array
4214          */
4215         nuv.ctr.ctr2.count = ni;
4216
4217         /*
4218          * sort the cursors
4219          */
4220         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
4221
4222         /*
4223          * create the change ldb_message
4224          */
4225         msg = ldb_msg_new(ar);
4226         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4227         msg->dn = ar->search_msg->dn;
4228
4229         ndr_err = ndr_push_struct_blob(&nuv_value, msg, &nuv,
4230                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
4231         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4232                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4233                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4234         }
4235         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
4236         if (ret != LDB_SUCCESS) {
4237                 return replmd_replicated_request_error(ar, ret);
4238         }
4239         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
4240
4241         /*
4242          * now create the new repsFrom value from the given repsFromTo1 structure
4243          */
4244         ZERO_STRUCT(nrf);
4245         nrf.version                                     = 1;
4246         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
4247         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
4248
4249         /*
4250          * first see if we already have a repsFrom value for the current source dsa
4251          * if so we'll later replace this value
4252          */
4253         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
4254         if (orf_el) {
4255                 for (i=0; i < orf_el->num_values; i++) {
4256                         struct repsFromToBlob *trf;
4257
4258                         trf = talloc(ar, struct repsFromToBlob);
4259                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4260
4261                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, trf,
4262                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
4263                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4264                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4265                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4266                         }
4267
4268                         if (trf->version != 1) {
4269                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
4270                         }
4271
4272                         /*
4273                          * we compare the source dsa objectGUID not the invocation_id
4274                          * because we want only one repsFrom value per source dsa
4275                          * and when the invocation_id of the source dsa has changed we don't need
4276                          * the old repsFrom with the old invocation_id
4277                          */
4278                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
4279                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
4280                                 talloc_free(trf);
4281                                 continue;
4282                         }
4283
4284                         talloc_free(trf);
4285                         nrf_value = &orf_el->values[i];
4286                         break;
4287                 }
4288
4289                 /*
4290                  * copy over all old values to the new ldb_message
4291                  */
4292                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
4293                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
4294                 *nrf_el = *orf_el;
4295         }
4296
4297         /*
4298          * if we haven't found an old repsFrom value for the current source dsa
4299          * we'll add a new value
4300          */
4301         if (!nrf_value) {
4302                 struct ldb_val zero_value;
4303                 ZERO_STRUCT(zero_value);
4304                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
4305                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
4306
4307                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
4308         }
4309
4310         /* we now fill the value which is already attached to ldb_message */
4311         ndr_err = ndr_push_struct_blob(nrf_value, msg,
4312                                        &nrf,
4313                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
4314         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4315                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
4316                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
4317         }
4318
4319         /*
4320          * the ldb_message_element for the attribute, has all the old values and the new one
4321          * so we'll replace the whole attribute with all values
4322          */
4323         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
4324
4325         if (CHECK_DEBUGLVL(4)) {
4326                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
4327                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
4328                 talloc_free(s);
4329         }
4330
4331         /* prepare the ldb_modify() request */
4332         ret = ldb_build_mod_req(&change_req,
4333                                 ldb,
4334                                 ar,
4335                                 msg,
4336                                 ar->controls,
4337                                 ar,
4338                                 replmd_replicated_uptodate_modify_callback,
4339                                 ar->req);
4340         LDB_REQ_SET_LOCATION(change_req);
4341         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
4342
4343         return ldb_next_request(ar->module, change_req);
4344 }
4345
4346 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
4347                                                       struct ldb_reply *ares)
4348 {
4349         struct replmd_replicated_request *ar = talloc_get_type(req->context,
4350                                                struct replmd_replicated_request);
4351         int ret;
4352
4353         if (!ares) {
4354                 return ldb_module_done(ar->req, NULL, NULL,
4355                                         LDB_ERR_OPERATIONS_ERROR);
4356         }
4357         if (ares->error != LDB_SUCCESS &&
4358             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
4359                 return ldb_module_done(ar->req, ares->controls,
4360                                         ares->response, ares->error);
4361         }
4362
4363         switch (ares->type) {
4364         case LDB_REPLY_ENTRY:
4365                 ar->search_msg = talloc_steal(ar, ares->message);
4366                 break;
4367
4368         case LDB_REPLY_REFERRAL:
4369                 /* we ignore referrals */
4370                 break;
4371
4372         case LDB_REPLY_DONE:
4373                 ret = replmd_replicated_uptodate_modify(ar);
4374                 if (ret != LDB_SUCCESS) {
4375                         return ldb_module_done(ar->req, NULL, NULL, ret);
4376                 }
4377         }
4378
4379         talloc_free(ares);
4380         return LDB_SUCCESS;
4381 }
4382
4383
4384 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
4385 {
4386         struct ldb_context *ldb;
4387         int ret;
4388         static const char *attrs[] = {
4389                 "replUpToDateVector",
4390                 "repsFrom",
4391                 "instanceType",
4392                 NULL
4393         };
4394         struct ldb_request *search_req;
4395
4396         ldb = ldb_module_get_ctx(ar->module);
4397         ar->search_msg = NULL;
4398
4399         ret = ldb_build_search_req(&search_req,
4400                                    ldb,
4401                                    ar,
4402                                    ar->objs->partition_dn,
4403                                    LDB_SCOPE_BASE,
4404                                    "(objectClass=*)",
4405                                    attrs,
4406                                    NULL,
4407                                    ar,
4408                                    replmd_replicated_uptodate_search_callback,
4409                                    ar->req);
4410         LDB_REQ_SET_LOCATION(search_req);
4411         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
4412
4413         return ldb_next_request(ar->module, search_req);
4414 }
4415
4416
4417
4418 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
4419 {
4420         struct ldb_context *ldb;
4421         struct dsdb_extended_replicated_objects *objs;
4422         struct replmd_replicated_request *ar;
4423         struct ldb_control **ctrls;
4424         int ret;
4425         uint32_t i;
4426         struct replmd_private *replmd_private =
4427                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4428         struct dsdb_control_replicated_update *rep_update;
4429
4430         ldb = ldb_module_get_ctx(module);
4431
4432         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
4433
4434         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
4435         if (!objs) {
4436                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
4437                 return LDB_ERR_PROTOCOL_ERROR;
4438         }
4439
4440         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
4441                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
4442                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
4443                 return LDB_ERR_PROTOCOL_ERROR;
4444         }
4445
4446         ar = replmd_ctx_init(module, req);
4447         if (!ar)
4448                 return LDB_ERR_OPERATIONS_ERROR;
4449
4450         /* Set the flags to have the replmd_op_callback run over the full set of objects */
4451         ar->apply_mode = true;
4452         ar->objs = objs;
4453         ar->schema = dsdb_get_schema(ldb, ar);
4454         if (!ar->schema) {
4455                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
4456                 talloc_free(ar);
4457                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
4458                 return LDB_ERR_CONSTRAINT_VIOLATION;
4459         }
4460
4461         ctrls = req->controls;
4462
4463         if (req->controls) {
4464                 req->controls = talloc_memdup(ar, req->controls,
4465                                               talloc_get_size(req->controls));
4466                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
4467         }
4468
4469         /* This allows layers further down to know if a change came in
4470            over replication and what the replication flags were */
4471         rep_update = talloc_zero(ar, struct dsdb_control_replicated_update);
4472         if (rep_update == NULL) {
4473                 return ldb_module_oom(module);
4474         }
4475         rep_update->dsdb_repl_flags = objs->dsdb_repl_flags;
4476
4477         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, rep_update);
4478         if (ret != LDB_SUCCESS) {
4479                 return ret;
4480         }
4481
4482         /* If this change contained linked attributes in the body
4483          * (rather than in the links section) we need to update
4484          * backlinks in linked_attributes */
4485         ret = ldb_request_add_control(req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
4486         if (ret != LDB_SUCCESS) {
4487                 return ret;
4488         }
4489
4490         ar->controls = req->controls;
4491         req->controls = ctrls;
4492
4493         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
4494
4495         /* save away the linked attributes for the end of the
4496            transaction */
4497         for (i=0; i<ar->objs->linked_attributes_count; i++) {
4498                 struct la_entry *la_entry;
4499
4500                 if (replmd_private->la_ctx == NULL) {
4501                         replmd_private->la_ctx = talloc_new(replmd_private);
4502                 }
4503                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
4504                 if (la_entry == NULL) {
4505                         ldb_oom(ldb);
4506                         return LDB_ERR_OPERATIONS_ERROR;
4507                 }
4508                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
4509                 if (la_entry->la == NULL) {
4510                         talloc_free(la_entry);
4511                         ldb_oom(ldb);
4512                         return LDB_ERR_OPERATIONS_ERROR;
4513                 }
4514                 *la_entry->la = ar->objs->linked_attributes[i];
4515
4516                 /* we need to steal the non-scalars so they stay
4517                    around until the end of the transaction */
4518                 talloc_steal(la_entry->la, la_entry->la->identifier);
4519                 talloc_steal(la_entry->la, la_entry->la->value.blob);
4520
4521                 DLIST_ADD(replmd_private->la_list, la_entry);
4522         }
4523
4524         return replmd_replicated_apply_next(ar);
4525 }
4526
4527 /*
4528   process one linked attribute structure
4529  */
4530 static int replmd_process_linked_attribute(struct ldb_module *module,
4531                                            struct la_entry *la_entry,
4532                                            struct ldb_request *parent)
4533 {
4534         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
4535         struct ldb_context *ldb = ldb_module_get_ctx(module);
4536         struct ldb_message *msg;
4537         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
4538         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
4539         int ret;
4540         const struct dsdb_attribute *attr;
4541         struct dsdb_dn *dsdb_dn;
4542         uint64_t seq_num = 0;
4543         struct ldb_message_element *old_el;
4544         WERROR status;
4545         time_t t = time(NULL);
4546         struct ldb_result *res;
4547         const char *attrs[2];
4548         struct parsed_dn *pdn_list, *pdn;
4549         struct GUID guid = GUID_zero();
4550         NTSTATUS ntstatus;
4551         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
4552         const struct GUID *our_invocation_id;
4553
4554 /*
4555 linked_attributes[0]:
4556      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
4557         identifier               : *
4558             identifier: struct drsuapi_DsReplicaObjectIdentifier
4559                 __ndr_size               : 0x0000003a (58)
4560                 __ndr_size_sid           : 0x00000000 (0)
4561                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
4562                 sid                      : S-0-0
4563                 __ndr_size_dn            : 0x00000000 (0)
4564                 dn                       : ''
4565         attid                    : DRSUAPI_ATTID_member (0x1F)
4566         value: struct drsuapi_DsAttributeValue
4567             __ndr_size               : 0x0000007e (126)
4568             blob                     : *
4569                 blob                     : DATA_BLOB length=126
4570         flags                    : 0x00000001 (1)
4571                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
4572         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
4573         meta_data: struct drsuapi_DsReplicaMetaData
4574             version                  : 0x00000015 (21)
4575             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
4576             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
4577             originating_usn          : 0x000000000001e19c (123292)
4578
4579 (for cases where the link is to a normal DN)
4580      &target: struct drsuapi_DsReplicaObjectIdentifier3
4581         __ndr_size               : 0x0000007e (126)
4582         __ndr_size_sid           : 0x0000001c (28)
4583         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
4584         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
4585         __ndr_size_dn            : 0x00000022 (34)
4586         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
4587  */
4588
4589         /* find the attribute being modified */
4590         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
4591         if (attr == NULL) {
4592                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
4593                 talloc_free(tmp_ctx);
4594                 return LDB_ERR_OPERATIONS_ERROR;
4595         }
4596
4597         attrs[0] = attr->lDAPDisplayName;
4598         attrs[1] = NULL;
4599
4600         /* get the existing message from the db for the object with
4601            this GUID, returning attribute being modified. We will then
4602            use this msg as the basis for a modify call */
4603         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
4604                                  DSDB_FLAG_NEXT_MODULE |
4605                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
4606                                  DSDB_SEARCH_SHOW_RECYCLED |
4607                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
4608                                  DSDB_SEARCH_REVEAL_INTERNALS,
4609                                  parent,
4610                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
4611         if (ret != LDB_SUCCESS) {
4612                 talloc_free(tmp_ctx);
4613                 return ret;
4614         }
4615         if (res->count != 1) {
4616                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
4617                                        GUID_string(tmp_ctx, &la->identifier->guid));
4618                 talloc_free(tmp_ctx);
4619                 return LDB_ERR_NO_SUCH_OBJECT;
4620         }
4621         msg = res->msgs[0];
4622
4623         if (msg->num_elements == 0) {
4624                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
4625                 if (ret != LDB_SUCCESS) {
4626                         ldb_module_oom(module);
4627                         talloc_free(tmp_ctx);
4628                         return LDB_ERR_OPERATIONS_ERROR;
4629                 }
4630         } else {
4631                 old_el = &msg->elements[0];
4632                 old_el->flags = LDB_FLAG_MOD_REPLACE;
4633         }
4634
4635         /* parse the existing links */
4636         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid, parent);
4637         if (ret != LDB_SUCCESS) {
4638                 talloc_free(tmp_ctx);
4639                 return ret;
4640         }
4641
4642         /* get our invocationId */
4643         our_invocation_id = samdb_ntds_invocation_id(ldb);
4644         if (!our_invocation_id) {
4645                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
4646                 talloc_free(tmp_ctx);
4647                 return LDB_ERR_OPERATIONS_ERROR;
4648         }
4649
4650         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
4651         if (ret != LDB_SUCCESS) {
4652                 talloc_free(tmp_ctx);
4653                 return ret;
4654         }
4655
4656         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
4657         if (!W_ERROR_IS_OK(status)) {
4658                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
4659                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
4660                 return LDB_ERR_OPERATIONS_ERROR;
4661         }
4662
4663         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
4664         if (!NT_STATUS_IS_OK(ntstatus) && active) {
4665                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
4666                                        old_el->name,
4667                                        ldb_dn_get_linearized(dsdb_dn->dn),
4668                                        ldb_dn_get_linearized(msg->dn));
4669                 return LDB_ERR_OPERATIONS_ERROR;
4670         }
4671
4672         /* re-resolve the DN by GUID, as the DRS server may give us an
4673            old DN value */
4674         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn, parent);
4675         if (ret != LDB_SUCCESS) {
4676                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s\n",
4677                          GUID_string(tmp_ctx, &guid),
4678                          ldb_dn_get_linearized(dsdb_dn->dn)));
4679         }
4680
4681         /* see if this link already exists */
4682         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
4683         if (pdn != NULL) {
4684                 /* see if this update is newer than what we have already */
4685                 struct GUID invocation_id = GUID_zero();
4686                 uint32_t version = 0;
4687                 uint32_t originating_usn = 0;
4688                 NTTIME change_time = 0;
4689                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
4690
4691                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
4692                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
4693                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &originating_usn, "RMD_ORIGINATING_USN");
4694                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
4695
4696                 if (!replmd_update_is_newer(&invocation_id,
4697                                             &la->meta_data.originating_invocation_id,
4698                                             version,
4699                                             la->meta_data.version,
4700                                             change_time,
4701                                             la->meta_data.originating_change_time)) {
4702                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
4703                                  old_el->name, ldb_dn_get_linearized(msg->dn),
4704                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
4705                         talloc_free(tmp_ctx);
4706                         return LDB_SUCCESS;
4707                 }
4708
4709                 /* get a seq_num for this change */
4710                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
4711                 if (ret != LDB_SUCCESS) {
4712                         talloc_free(tmp_ctx);
4713                         return ret;
4714                 }
4715
4716                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
4717                         /* remove the existing backlink */
4718                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
4719                         if (ret != LDB_SUCCESS) {
4720                                 talloc_free(tmp_ctx);
4721                                 return ret;
4722                         }
4723                 }
4724
4725                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
4726                                            &la->meta_data.originating_invocation_id,
4727                                            la->meta_data.originating_usn, seq_num,
4728                                            la->meta_data.originating_change_time,
4729                                            la->meta_data.version,
4730                                            !active);
4731                 if (ret != LDB_SUCCESS) {
4732                         talloc_free(tmp_ctx);
4733                         return ret;
4734                 }
4735
4736                 if (active) {
4737                         /* add the new backlink */
4738                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
4739                         if (ret != LDB_SUCCESS) {
4740                                 talloc_free(tmp_ctx);
4741                                 return ret;
4742                         }
4743                 }
4744         } else {
4745                 /* get a seq_num for this change */
4746                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
4747                 if (ret != LDB_SUCCESS) {
4748                         talloc_free(tmp_ctx);
4749                         return ret;
4750                 }
4751
4752                 old_el->values = talloc_realloc(msg->elements, old_el->values,
4753                                                 struct ldb_val, old_el->num_values+1);
4754                 if (!old_el->values) {
4755                         ldb_module_oom(module);
4756                         return LDB_ERR_OPERATIONS_ERROR;
4757                 }
4758                 old_el->num_values++;
4759
4760                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
4761                                           &la->meta_data.originating_invocation_id,
4762                                           la->meta_data.originating_usn, seq_num,
4763                                           la->meta_data.originating_change_time,
4764                                           la->meta_data.version,
4765                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
4766                 if (ret != LDB_SUCCESS) {
4767                         talloc_free(tmp_ctx);
4768                         return ret;
4769                 }
4770
4771                 if (active) {
4772                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
4773                                                   true, attr, false);
4774                         if (ret != LDB_SUCCESS) {
4775                                 talloc_free(tmp_ctx);
4776                                 return ret;
4777                         }
4778                 }
4779         }
4780
4781         /* we only change whenChanged and uSNChanged if the seq_num
4782            has changed */
4783         ret = add_time_element(msg, "whenChanged", t);
4784         if (ret != LDB_SUCCESS) {
4785                 talloc_free(tmp_ctx);
4786                 ldb_operr(ldb);
4787                 return ret;
4788         }
4789
4790         ret = add_uint64_element(ldb, msg, "uSNChanged", seq_num);
4791         if (ret != LDB_SUCCESS) {
4792                 talloc_free(tmp_ctx);
4793                 ldb_operr(ldb);
4794                 return ret;
4795         }
4796
4797         old_el = ldb_msg_find_element(msg, attr->lDAPDisplayName);
4798         if (old_el == NULL) {
4799                 talloc_free(tmp_ctx);
4800                 return ldb_operr(ldb);
4801         }
4802
4803         ret = dsdb_check_single_valued_link(attr, old_el);
4804         if (ret != LDB_SUCCESS) {
4805                 talloc_free(tmp_ctx);
4806                 return ret;
4807         }
4808
4809         old_el->flags |= LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK;
4810
4811         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE, parent);
4812         if (ret != LDB_SUCCESS) {
4813                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
4814                           ldb_errstring(ldb),
4815                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
4816                 talloc_free(tmp_ctx);
4817                 return ret;
4818         }
4819
4820         talloc_free(tmp_ctx);
4821
4822         return ret;
4823 }
4824
4825 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
4826 {
4827         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
4828                 return replmd_extended_replicated_objects(module, req);
4829         }
4830
4831         return ldb_next_request(module, req);
4832 }
4833
4834
4835 /*
4836   we hook into the transaction operations to allow us to
4837   perform the linked attribute updates at the end of the whole
4838   transaction. This allows a forward linked attribute to be created
4839   before the object is created. During a vampire, w2k8 sends us linked
4840   attributes before the objects they are part of.
4841  */
4842 static int replmd_start_transaction(struct ldb_module *module)
4843 {
4844         /* create our private structure for this transaction */
4845         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
4846                                                                 struct replmd_private);
4847         replmd_txn_cleanup(replmd_private);
4848
4849         /* free any leftover mod_usn records from cancelled
4850            transactions */
4851         while (replmd_private->ncs) {
4852                 struct nc_entry *e = replmd_private->ncs;
4853                 DLIST_REMOVE(replmd_private->ncs, e);
4854                 talloc_free(e);
4855         }
4856
4857         return ldb_next_start_trans(module);
4858 }
4859
4860 /*
4861   on prepare commit we loop over our queued la_context structures and
4862   apply each of them
4863  */
4864 static int replmd_prepare_commit(struct ldb_module *module)
4865 {
4866         struct replmd_private *replmd_private =
4867                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4868         struct la_entry *la, *prev;
4869         struct la_backlink *bl;
4870         int ret;
4871
4872         /* walk the list backwards, to do the first entry first, as we
4873          * added the entries with DLIST_ADD() which puts them at the
4874          * start of the list */
4875         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
4876                 prev = DLIST_PREV(la);
4877                 DLIST_REMOVE(replmd_private->la_list, la);
4878                 ret = replmd_process_linked_attribute(module, la, NULL);
4879                 if (ret != LDB_SUCCESS) {
4880                         replmd_txn_cleanup(replmd_private);
4881                         return ret;
4882                 }
4883         }
4884
4885         /* process our backlink list, creating and deleting backlinks
4886            as necessary */
4887         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
4888                 ret = replmd_process_backlink(module, bl, NULL);
4889                 if (ret != LDB_SUCCESS) {
4890                         replmd_txn_cleanup(replmd_private);
4891                         return ret;
4892                 }
4893         }
4894
4895         replmd_txn_cleanup(replmd_private);
4896
4897         /* possibly change @REPLCHANGED */
4898         ret = replmd_notify_store(module, NULL);
4899         if (ret != LDB_SUCCESS) {
4900                 return ret;
4901         }
4902
4903         return ldb_next_prepare_commit(module);
4904 }
4905
4906 static int replmd_del_transaction(struct ldb_module *module)
4907 {
4908         struct replmd_private *replmd_private =
4909                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4910         replmd_txn_cleanup(replmd_private);
4911
4912         return ldb_next_del_trans(module);
4913 }
4914
4915
4916 static const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
4917         .name          = "repl_meta_data",
4918         .init_context      = replmd_init,
4919         .add               = replmd_add,
4920         .modify            = replmd_modify,
4921         .rename            = replmd_rename,
4922         .del               = replmd_delete,
4923         .extended          = replmd_extended,
4924         .start_transaction = replmd_start_transaction,
4925         .prepare_commit    = replmd_prepare_commit,
4926         .del_transaction   = replmd_del_transaction,
4927 };
4928
4929 int ldb_repl_meta_data_module_init(const char *version)
4930 {
4931         LDB_MODULE_CHECK_VERSION(version);
4932         return ldb_register_module(&ldb_repl_meta_data_module_ops);
4933 }