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 "libcli/security/session.h"
  52 #include "lib/util/tsort.h"
  53
  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         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE, parent);
 251         if (ret != LDB_SUCCESS) {
 252                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 253                                        bl->active?"add":"remove",
 254                                        ldb_dn_get_linearized(source_dn),
 255                                        ldb_dn_get_linearized(target_dn),
 256                                        ldb_errstring(ldb));
 257                 talloc_free(tmp_ctx);
 258                 return ret;
 259         }
 260         talloc_free(tmp_ctx);
 261         return ret;
 262 }
 263
 264 /*
 265   add a backlink to the list of backlinks to add/delete in the prepare
 266   commit
 267  */
 268 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 269                                struct GUID *forward_guid, struct GUID *target_guid,
 270                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 271 {
 272         const struct dsdb_attribute *target_attr;
 273         struct la_backlink *bl;
 274         struct replmd_private *replmd_private =
 275                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 276
 277         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 278         if (!target_attr) {
 279                 /*
 280                  * windows 2003 has a broken schema where the
 281                  * definition of msDS-IsDomainFor is missing (which is
 282                  * supposed to be the backlink of the
 283                  * msDS-HasDomainNCs attribute
 284                  */
 285                 return LDB_SUCCESS;
 286         }
 287
 288         /* see if its already in the list */
 289         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 290                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 291                     GUID_equal(target_guid, &bl->target_guid) &&
 292                     (target_attr->lDAPDisplayName == bl->attr_name ||
 293                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 294                         break;
 295                 }
 296         }
 297
 298         if (bl) {
 299                 /* we found an existing one */
 300                 if (bl->active == active) {
 301                         return LDB_SUCCESS;
 302                 }
 303                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 304                 talloc_free(bl);
 305                 return LDB_SUCCESS;
 306         }
 307
 308         if (replmd_private->bl_ctx == NULL) {
 309                 replmd_private->bl_ctx = talloc_new(replmd_private);
 310                 if (replmd_private->bl_ctx == NULL) {
 311                         ldb_module_oom(module);
 312                         return LDB_ERR_OPERATIONS_ERROR;
 313                 }
 314         }
 315
 316         /* its a new one */
 317         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 318         if (bl == NULL) {
 319                 ldb_module_oom(module);
 320                 return LDB_ERR_OPERATIONS_ERROR;
 321         }
 322
 323         /* Ensure the schema does not go away before the bl->attr_name is used */
 324         if (!talloc_reference(bl, schema)) {
 325                 talloc_free(bl);
 326                 ldb_module_oom(module);
 327                 return LDB_ERR_OPERATIONS_ERROR;
 328         }
 329
 330         bl->attr_name = target_attr->lDAPDisplayName;
 331         bl->forward_guid = *forward_guid;
 332         bl->target_guid = *target_guid;
 333         bl->active = active;
 334
 335         /* the caller may ask for this backlink to be processed
 336            immediately */
 337         if (immediate) {
 338                 int ret = replmd_process_backlink(module, bl, NULL);
 339                 talloc_free(bl);
 340                 return ret;
 341         }
 342
 343         DLIST_ADD(replmd_private->la_backlinks, bl);
 344
 345         return LDB_SUCCESS;
 346 }
 347
 348
 349 /*
 350  * Callback for most write operations in this module:
 351  *
 352  * notify the repl task that a object has changed. The notifies are
 353  * gathered up in the replmd_private structure then written to the
 354  * @REPLCHANGED object in each partition during the prepare_commit
 355  */
 356 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 357 {
 358         int ret;
 359         struct replmd_replicated_request *ac =
 360                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 361         struct replmd_private *replmd_private =
 362                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 363         struct nc_entry *modified_partition;
 364         struct ldb_control *partition_ctrl;
 365         const struct dsdb_control_current_partition *partition;
 366
 367         struct ldb_control **controls;
 368
 369         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 370
 371         /* Remove the 'partition' control from what we pass up the chain */
 372         controls = ldb_controls_except_specified(ares->controls, ares, partition_ctrl);
 373
 374         if (ares->error != LDB_SUCCESS) {
 375                 DEBUG(0,("%s failure. Error is: %s\n", __FUNCTION__, ldb_strerror(ares->error)));
 376                 return ldb_module_done(ac->req, controls,
 377                                         ares->response, ares->error);
 378         }
 379
 380         if (ares->type != LDB_REPLY_DONE) {
 381                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 382                 return ldb_module_done(ac->req, NULL,
 383                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 384         }
 385
 386         if (!partition_ctrl) {
 387                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 388                 return ldb_module_done(ac->req, NULL,
 389                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 390         }
 391
 392         partition = talloc_get_type_abort(partition_ctrl->data,
 393                                     struct dsdb_control_current_partition);
 394
 395         if (ac->seq_num > 0) {
 396                 for (modified_partition = replmd_private->ncs; modified_partition;
 397                      modified_partition = modified_partition->next) {
 398                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 399                                 break;
 400                         }
 401                 }
 402
 403                 if (modified_partition == NULL) {
 404                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 405                         if (!modified_partition) {
 406                                 ldb_oom(ldb_module_get_ctx(ac->module));
 407                                 return ldb_module_done(ac->req, NULL,
 408                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 409                         }
 410                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 411                         if (!modified_partition->dn) {
 412                                 ldb_oom(ldb_module_get_ctx(ac->module));
 413                                 return ldb_module_done(ac->req, NULL,
 414                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 415                         }
 416                         DLIST_ADD(replmd_private->ncs, modified_partition);
 417                 }
 418
 419                 if (ac->seq_num > modified_partition->mod_usn) {
 420                         modified_partition->mod_usn = ac->seq_num;
 421                         if (ac->is_urgent) {
 422                                 modified_partition->mod_usn_urgent = ac->seq_num;
 423                         }
 424                 }
 425         }
 426
 427         if (ac->apply_mode) {
 428                 talloc_free(ares);
 429                 ac->index_current++;
 430
 431                 ret = replmd_replicated_apply_next(ac);
 432                 if (ret != LDB_SUCCESS) {
 433                         return ldb_module_done(ac->req, NULL, NULL, ret);
 434                 }
 435                 return ret;
 436         } else {
 437                 /* free the partition control container here, for the
 438                  * common path.  Other cases will have it cleaned up
 439                  * eventually with the ares */
 440                 talloc_free(partition_ctrl);
 441                 return ldb_module_done(ac->req,
 442                                        ldb_controls_except_specified(controls, ares, partition_ctrl),
 443                                        ares->response, LDB_SUCCESS);
 444         }
 445 }
 446
 447
 448 /*
 449  * update a @REPLCHANGED record in each partition if there have been
 450  * any writes of replicated data in the partition
 451  */
 452 static int replmd_notify_store(struct ldb_module *module, struct ldb_request *parent)
 453 {
 454         struct replmd_private *replmd_private =
 455                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 456
 457         while (replmd_private->ncs) {
 458                 int ret;
 459                 struct nc_entry *modified_partition = replmd_private->ncs;
 460
 461                 ret = dsdb_module_save_partition_usn(module, modified_partition->dn,
 462                                                      modified_partition->mod_usn,
 463                                                      modified_partition->mod_usn_urgent, parent);
 464                 if (ret != LDB_SUCCESS) {
 465                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 466                                  ldb_dn_get_linearized(modified_partition->dn)));
 467                         return ret;
 468                 }
 469                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 470                 talloc_free(modified_partition);
 471         }
 472
 473         return LDB_SUCCESS;
 474 }
 475
 476
 477 /*
 478   created a replmd_replicated_request context
 479  */
 480 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 481                                                          struct ldb_request *req)
 482 {
 483         struct ldb_context *ldb;
 484         struct replmd_replicated_request *ac;
 485
 486         ldb = ldb_module_get_ctx(module);
 487
 488         ac = talloc_zero(req, struct replmd_replicated_request);
 489         if (ac == NULL) {
 490                 ldb_oom(ldb);
 491                 return NULL;
 492         }
 493
 494         ac->module = module;
 495         ac->req = req;
 496
 497         ac->schema = dsdb_get_schema(ldb, ac);
 498         if (!ac->schema) {
 499                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 500                               "replmd_modify: no dsdb_schema loaded");
 501                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 502                 return NULL;
 503         }
 504
 505         return ac;
 506 }
 507
 508 /*
 509   add a time element to a record
 510 */
 511 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 512 {
 513         struct ldb_message_element *el;
 514         char *s;
 515         int ret;
 516
 517         if (ldb_msg_find_element(msg, attr) != NULL) {
 518                 return LDB_SUCCESS;
 519         }
 520
 521         s = ldb_timestring(msg, t);
 522         if (s == NULL) {
 523                 return LDB_ERR_OPERATIONS_ERROR;
 524         }
 525
 526         ret = ldb_msg_add_string(msg, attr, s);
 527         if (ret != LDB_SUCCESS) {
 528                 return ret;
 529         }
 530
 531         el = ldb_msg_find_element(msg, attr);
 532         /* always set as replace. This works because on add ops, the flag
 533            is ignored */
 534         el->flags = LDB_FLAG_MOD_REPLACE;
 535
 536         return LDB_SUCCESS;
 537 }
 538
 539 /*
 540   add a uint64_t element to a record
 541 */
 542 static int add_uint64_element(struct ldb_context *ldb, struct ldb_message *msg,
 543                               const char *attr, uint64_t v)
 544 {
 545         struct ldb_message_element *el;
 546         int ret;
 547
 548         if (ldb_msg_find_element(msg, attr) != NULL) {
 549                 return LDB_SUCCESS;
 550         }
 551
 552         ret = samdb_msg_add_uint64(ldb, msg, msg, attr, v);
 553         if (ret != LDB_SUCCESS) {
 554                 return ret;
 555         }
 556
 557         el = ldb_msg_find_element(msg, attr);
 558         /* always set as replace. This works because on add ops, the flag
 559            is ignored */
 560         el->flags = LDB_FLAG_MOD_REPLACE;
 561
 562         return LDB_SUCCESS;
 563 }
 564
 565 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 566                                                    const struct replPropertyMetaData1 *m2,
 567                                                    const uint32_t *rdn_attid)
 568 {
 569         if (m1->attid == m2->attid) {
 570                 return 0;
 571         }
 572
 573         /*
 574          * the rdn attribute should be at the end!
 575          * so we need to return a value greater than zero
 576          * which means m1 is greater than m2
 577          */
 578         if (m1->attid == *rdn_attid) {
 579                 return 1;
 580         }
 581
 582         /*
 583          * the rdn attribute should be at the end!
 584          * so we need to return a value less than zero
 585          * which means m2 is greater than m1
 586          */
 587         if (m2->attid == *rdn_attid) {
 588                 return -1;
 589         }
 590
 591         return m1->attid > m2->attid ? 1 : -1;
 592 }
 593
 594 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 595                                                 const struct dsdb_schema *schema,
 596                                                 struct ldb_dn *dn)
 597 {
 598         const char *rdn_name;
 599         const struct dsdb_attribute *rdn_sa;
 600
 601         rdn_name = ldb_dn_get_rdn_name(dn);
 602         if (!rdn_name) {
 603                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 604                 return LDB_ERR_OPERATIONS_ERROR;
 605         }
 606
 607         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 608         if (rdn_sa == NULL) {
 609                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 610                 return LDB_ERR_OPERATIONS_ERROR;
 611         }
 612
 613         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 614                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 615
 616         LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
 617
 618         return LDB_SUCCESS;
 619 }
 620
 621 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 622                                                  const struct ldb_message_element *e2,
 623                                                  const struct dsdb_schema *schema)
 624 {
 625         const struct dsdb_attribute *a1;
 626         const struct dsdb_attribute *a2;
 627
 628         /*
 629          * TODO: make this faster by caching the dsdb_attribute pointer
 630          *       on the ldb_messag_element
 631          */
 632
 633         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 634         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 635
 636         /*
 637          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 638          *       in the schema
 639          */
 640         if (!a1 || !a2) {
 641                 return strcasecmp(e1->name, e2->name);
 642         }
 643         if (a1->attributeID_id == a2->attributeID_id) {
 644                 return 0;
 645         }
 646         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 647 }
 648
 649 static void replmd_ldb_message_sort(struct ldb_message *msg,
 650                                     const struct dsdb_schema *schema)
 651 {
 652         LDB_TYPESAFE_QSORT(msg->elements, msg->num_elements, schema, replmd_ldb_message_element_attid_sort);
 653 }
 654
 655 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 656                                const struct GUID *invocation_id, uint64_t seq_num,
 657                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 658
 659
 660 /*
 661   fix up linked attributes in replmd_add.
 662   This involves setting up the right meta-data in extended DN
 663   components, and creating backlinks to the object
 664  */
 665 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 666                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 667                              struct GUID *guid, const struct dsdb_attribute *sa, struct ldb_request *parent)
 668 {
 669         unsigned int i;
 670         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 671         struct ldb_context *ldb = ldb_module_get_ctx(module);
 672
 673         /* We will take a reference to the schema in replmd_add_backlink */
 674         const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
 675         NTTIME now;
 676
 677         unix_to_nt_time(&now, t);
 678
 679         for (i=0; i<el->num_values; i++) {
 680                 struct ldb_val *v = &el->values[i];
 681                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 682                 struct GUID target_guid;
 683                 NTSTATUS status;
 684                 int ret;
 685
 686                 /* note that the DN already has the extended
 687                    components from the extended_dn_store module */
 688                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 689                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 690                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid, parent);
 691                         if (ret != LDB_SUCCESS) {
 692                                 talloc_free(tmp_ctx);
 693                                 return ret;
 694                         }
 695                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 696                         if (ret != LDB_SUCCESS) {
 697                                 talloc_free(tmp_ctx);
 698                                 return ret;
 699                         }
 700                 }
 701
 702                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 703                                           seq_num, seq_num, now, 0, false);
 704                 if (ret != LDB_SUCCESS) {
 705                         talloc_free(tmp_ctx);
 706                         return ret;
 707                 }
 708
 709                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 710                 if (ret != LDB_SUCCESS) {
 711                         talloc_free(tmp_ctx);
 712                         return ret;
 713                 }
 714         }
 715
 716         talloc_free(tmp_ctx);
 717         return LDB_SUCCESS;
 718 }
 719
 720
 721 /*
 722   intercept add requests
 723  */
 724 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 725 {
 726         struct ldb_context *ldb;
 727         struct ldb_control *control;
 728         struct replmd_replicated_request *ac;
 729         enum ndr_err_code ndr_err;
 730         struct ldb_request *down_req;
 731         struct ldb_message *msg;
 732         const DATA_BLOB *guid_blob;
 733         struct GUID guid;
 734         struct replPropertyMetaDataBlob nmd;
 735         struct ldb_val nmd_value;
 736         const struct GUID *our_invocation_id;
 737         time_t t = time(NULL);
 738         NTTIME now;
 739         char *time_str;
 740         int ret;
 741         unsigned int i;
 742         unsigned int functional_level;
 743         uint32_t ni=0;
 744         bool allow_add_guid = false;
 745         bool remove_current_guid = false;
 746         bool is_urgent = false;
 747         struct ldb_message_element *objectclass_el;
 748
 749         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 750         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 751         if (control) {
 752                 allow_add_guid = true;
 753         }
 754
 755         /* do not manipulate our control entries */
 756         if (ldb_dn_is_special(req->op.add.message->dn)) {
 757                 return ldb_next_request(module, req);
 758         }
 759
 760         ldb = ldb_module_get_ctx(module);
 761
 762         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 763
 764         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 765         if (guid_blob != NULL) {
 766                 if (!allow_add_guid) {
 767                         ldb_set_errstring(ldb,
 768                                           "replmd_add: it's not allowed to add an object with objectGUID!");
 769                         return LDB_ERR_UNWILLING_TO_PERFORM;
 770                 } else {
 771                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 772                         if (!NT_STATUS_IS_OK(status)) {
 773                                 ldb_set_errstring(ldb,
 774                                                   "replmd_add: Unable to parse the 'objectGUID' as a GUID!");
 775                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 776                         }
 777                         /* we remove this attribute as it can be a string and
 778                          * will not be treated correctly and then we will re-add
 779                          * it later on in the good format */
 780                         remove_current_guid = true;
 781                 }
 782         } else {
 783                 /* a new GUID */
 784                 guid = GUID_random();
 785         }
 786
 787         ac = replmd_ctx_init(module, req);
 788         if (ac == NULL) {
 789                 return ldb_module_oom(module);
 790         }
 791
 792         functional_level = dsdb_functional_level(ldb);
 793
 794         /* Get a sequence number from the backend */
 795         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 796         if (ret != LDB_SUCCESS) {
 797                 talloc_free(ac);
 798                 return ret;
 799         }
 800
 801         /* get our invocationId */
 802         our_invocation_id = samdb_ntds_invocation_id(ldb);
 803         if (!our_invocation_id) {
 804                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 805                               "replmd_add: unable to find invocationId\n");
 806                 talloc_free(ac);
 807                 return LDB_ERR_OPERATIONS_ERROR;
 808         }
 809
 810         /* we have to copy the message as the caller might have it as a const */
 811         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 812         if (msg == NULL) {
 813                 ldb_oom(ldb);
 814                 talloc_free(ac);
 815                 return LDB_ERR_OPERATIONS_ERROR;
 816         }
 817
 818         /* generated times */
 819         unix_to_nt_time(&now, t);
 820         time_str = ldb_timestring(msg, t);
 821         if (!time_str) {
 822                 ldb_oom(ldb);
 823                 talloc_free(ac);
 824                 return LDB_ERR_OPERATIONS_ERROR;
 825         }
 826         if (remove_current_guid) {
 827                 ldb_msg_remove_attr(msg,"objectGUID");
 828         }
 829
 830         /*
 831          * remove autogenerated attributes
 832          */
 833         ldb_msg_remove_attr(msg, "whenCreated");
 834         ldb_msg_remove_attr(msg, "whenChanged");
 835         ldb_msg_remove_attr(msg, "uSNCreated");
 836         ldb_msg_remove_attr(msg, "uSNChanged");
 837         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 838
 839         /*
 840          * readd replicated attributes
 841          */
 842         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 843         if (ret != LDB_SUCCESS) {
 844                 ldb_oom(ldb);
 845                 talloc_free(ac);
 846                 return ret;
 847         }
 848
 849         /* build the replication meta_data */
 850         ZERO_STRUCT(nmd);
 851         nmd.version             = 1;
 852         nmd.ctr.ctr1.count      = msg->num_elements;
 853         nmd.ctr.ctr1.array      = talloc_array(msg,
 854                                                struct replPropertyMetaData1,
 855                                                nmd.ctr.ctr1.count);
 856         if (!nmd.ctr.ctr1.array) {
 857                 ldb_oom(ldb);
 858                 talloc_free(ac);
 859                 return LDB_ERR_OPERATIONS_ERROR;
 860         }
 861
 862         for (i=0; i < msg->num_elements; i++) {
 863                 struct ldb_message_element *e = &msg->elements[i];
 864                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 865                 const struct dsdb_attribute *sa;
 866
 867                 if (e->name[0] == '@') continue;
 868
 869                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 870                 if (!sa) {
 871                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 872                                       "replmd_add: attribute '%s' not defined in schema\n",
 873                                       e->name);
 874                         talloc_free(ac);
 875                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 876                 }
 877
 878                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 879                         /* if the attribute is not replicated (0x00000001)
 880                          * or constructed (0x00000004) it has no metadata
 881                          */
 882                         continue;
 883                 }
 884
 885                 if (sa->linkID != 0 && functional_level > DS_DOMAIN_FUNCTION_2000) {
 886                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa, req);
 887                         if (ret != LDB_SUCCESS) {
 888                                 talloc_free(ac);
 889                                 return ret;
 890                         }
 891                         /* linked attributes are not stored in
 892                            replPropertyMetaData in FL above w2k */
 893                         continue;
 894                 }
 895
 896                 m->attid                        = sa->attributeID_id;
 897                 m->version                      = 1;
 898                 m->originating_change_time      = now;
 899                 m->originating_invocation_id    = *our_invocation_id;
 900                 m->originating_usn              = ac->seq_num;
 901                 m->local_usn                    = ac->seq_num;
 902                 ni++;
 903         }
 904
 905         /* fix meta data count */
 906         nmd.ctr.ctr1.count = ni;
 907
 908         /*
 909          * sort meta data array, and move the rdn attribute entry to the end
 910          */
 911         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 912         if (ret != LDB_SUCCESS) {
 913                 talloc_free(ac);
 914                 return ret;
 915         }
 916
 917         /* generated NDR encoded values */
 918         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 919                                        &nmd,
 920                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 921         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 922                 ldb_oom(ldb);
 923                 talloc_free(ac);
 924                 return LDB_ERR_OPERATIONS_ERROR;
 925         }
 926
 927         /*
 928          * add the autogenerated values
 929          */
 930         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 931         if (ret != LDB_SUCCESS) {
 932                 ldb_oom(ldb);
 933                 talloc_free(ac);
 934                 return ret;
 935         }
 936         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 937         if (ret != LDB_SUCCESS) {
 938                 ldb_oom(ldb);
 939                 talloc_free(ac);
 940                 return ret;
 941         }
 942         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 943         if (ret != LDB_SUCCESS) {
 944                 ldb_oom(ldb);
 945                 talloc_free(ac);
 946                 return ret;
 947         }
 948         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 949         if (ret != LDB_SUCCESS) {
 950                 ldb_oom(ldb);
 951                 talloc_free(ac);
 952                 return ret;
 953         }
 954         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 955         if (ret != LDB_SUCCESS) {
 956                 ldb_oom(ldb);
 957                 talloc_free(ac);
 958                 return ret;
 959         }
 960
 961         /*
 962          * sort the attributes by attid before storing the object
 963          */
 964         replmd_ldb_message_sort(msg, ac->schema);
 965
 966         objectclass_el = ldb_msg_find_element(msg, "objectClass");
 967         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
 968                                                         REPL_URGENT_ON_CREATE);
 969
 970         ac->is_urgent = is_urgent;
 971         ret = ldb_build_add_req(&down_req, ldb, ac,
 972                                 msg,
 973                                 req->controls,
 974                                 ac, replmd_op_callback,
 975                                 req);
 976
 977         LDB_REQ_SET_LOCATION(down_req);
 978         if (ret != LDB_SUCCESS) {
 979                 talloc_free(ac);
 980                 return ret;
 981         }
 982
 983         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
 984                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
 985                 if (ret != LDB_SUCCESS) {
 986                         talloc_free(ac);
 987                         return ret;
 988                 }
 989         }
 990
 991         /* mark the control done */
 992         if (control) {
 993                 control->critical = 0;
 994         }
 995
 996         /* go on with the call chain */
 997         return ldb_next_request(module, down_req);
 998 }
 999
1000
1001 /*
1002  * update the replPropertyMetaData for one element
1003  */
1004 static int replmd_update_rpmd_element(struct ldb_context *ldb,
1005                                       struct ldb_message *msg,
1006                                       struct ldb_message_element *el,
1007                                       struct ldb_message_element *old_el,
1008                                       struct replPropertyMetaDataBlob *omd,
1009                                       const struct dsdb_schema *schema,
1010                                       uint64_t *seq_num,
1011                                       const struct GUID *our_invocation_id,
1012                                       NTTIME now)
1013 {
1014         uint32_t i;
1015         const struct dsdb_attribute *a;
1016         struct replPropertyMetaData1 *md1;
1017
1018         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1019         if (a == NULL) {
1020                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1021                          el->name));
1022                 return LDB_ERR_OPERATIONS_ERROR;
1023         }
1024
1025         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1026                 return LDB_SUCCESS;
1027         }
1028
1029         /* if the attribute's value haven't changed then return LDB_SUCCESS     */
1030         if (old_el != NULL && ldb_msg_element_compare(el, old_el) == 0) {
1031                 return LDB_SUCCESS;
1032         }
1033
1034         for (i=0; i<omd->ctr.ctr1.count; i++) {
1035                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1036         }
1037
1038         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1039                 /* linked attributes are not stored in
1040                    replPropertyMetaData in FL above w2k, but we do
1041                    raise the seqnum for the object  */
1042                 if (*seq_num == 0 &&
1043                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1044                         return LDB_ERR_OPERATIONS_ERROR;
1045                 }
1046                 return LDB_SUCCESS;
1047         }
1048
1049         if (i == omd->ctr.ctr1.count) {
1050                 /* we need to add a new one */
1051                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1052                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1053                 if (omd->ctr.ctr1.array == NULL) {
1054                         ldb_oom(ldb);
1055                         return LDB_ERR_OPERATIONS_ERROR;
1056                 }
1057                 omd->ctr.ctr1.count++;
1058                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1059         }
1060
1061         /* Get a new sequence number from the backend. We only do this
1062          * if we have a change that requires a new
1063          * replPropertyMetaData element
1064          */
1065         if (*seq_num == 0) {
1066                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1067                 if (ret != LDB_SUCCESS) {
1068                         return LDB_ERR_OPERATIONS_ERROR;
1069                 }
1070         }
1071
1072         md1 = &omd->ctr.ctr1.array[i];
1073         md1->version++;
1074         md1->attid                     = a->attributeID_id;
1075         md1->originating_change_time   = now;
1076         md1->originating_invocation_id = *our_invocation_id;
1077         md1->originating_usn           = *seq_num;
1078         md1->local_usn                 = *seq_num;
1079
1080         return LDB_SUCCESS;
1081 }
1082
1083 static uint64_t find_max_local_usn(struct replPropertyMetaDataBlob omd)
1084 {
1085         uint32_t count = omd.ctr.ctr1.count;
1086         uint64_t max = 0;
1087         uint32_t i;
1088         for (i=0; i < count; i++) {
1089                 struct replPropertyMetaData1 m = omd.ctr.ctr1.array[i];
1090                 if (max < m.local_usn) {
1091                         max = m.local_usn;
1092                 }
1093         }
1094         return max;
1095 }
1096
1097 /*
1098  * update the replPropertyMetaData object each time we modify an
1099  * object. This is needed for DRS replication, as the merge on the
1100  * client is based on this object
1101  */
1102 static int replmd_update_rpmd(struct ldb_module *module,
1103                               const struct dsdb_schema *schema,
1104                               struct ldb_request *req,
1105                               struct ldb_message *msg, uint64_t *seq_num,
1106                               time_t t,
1107                               bool *is_urgent)
1108 {
1109         const struct ldb_val *omd_value;
1110         enum ndr_err_code ndr_err;
1111         struct replPropertyMetaDataBlob omd;
1112         unsigned int i;
1113         NTTIME now;
1114         const struct GUID *our_invocation_id;
1115         int ret;
1116         const char *attrs[] = { "replPropertyMetaData", "*", NULL };
1117         const char *attrs2[] = { "uSNChanged", "objectClass", NULL };
1118         struct ldb_result *res;
1119         struct ldb_context *ldb;
1120         struct ldb_message_element *objectclass_el;
1121         enum urgent_situation situation;
1122         bool rodc, rmd_is_provided;
1123
1124         ldb = ldb_module_get_ctx(module);
1125
1126         our_invocation_id = samdb_ntds_invocation_id(ldb);
1127         if (!our_invocation_id) {
1128                 /* this happens during an initial vampire while
1129                    updating the schema */
1130                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1131                 return LDB_SUCCESS;
1132         }
1133
1134         unix_to_nt_time(&now, t);
1135
1136         if (ldb_request_get_control(req, DSDB_CONTROL_CHANGEREPLMETADATA_OID)) {
1137                 rmd_is_provided = true;
1138         } else {
1139                 rmd_is_provided = false;
1140         }
1141
1142         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1143          * otherwise we consider we are updating */
1144         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1145                 situation = REPL_URGENT_ON_DELETE;
1146         } else {
1147                 situation = REPL_URGENT_ON_UPDATE;
1148         }
1149
1150         if (rmd_is_provided) {
1151                 /* In this case the change_replmetadata control was supplied */
1152                 /* We check that it's the only attribute that is provided
1153                  * (it's a rare case so it's better to keep the code simplier)
1154                  * We also check that the highest local_usn is bigger than
1155                  * uSNChanged. */
1156                 uint64_t db_seq;
1157                 if( msg->num_elements != 1 ||
1158                         strncmp(msg->elements[0].name,
1159                                 "replPropertyMetaData", 20) ) {
1160                         DEBUG(0,(__location__ ": changereplmetada control called without "\
1161                                 "a specified replPropertyMetaData attribute or with others\n"));
1162                         return LDB_ERR_OPERATIONS_ERROR;
1163                 }
1164                 if (situation == REPL_URGENT_ON_DELETE) {
1165                         DEBUG(0,(__location__ ": changereplmetada control can't be called when deleting an object\n"));
1166                         return LDB_ERR_OPERATIONS_ERROR;
1167                 }
1168                 omd_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
1169                 if (!omd_value) {
1170                         DEBUG(0,(__location__ ": replPropertyMetaData was not specified for Object %s\n",
1171                                  ldb_dn_get_linearized(msg->dn)));
1172                         return LDB_ERR_OPERATIONS_ERROR;
1173                 }
1174                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1175                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1176                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1177                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1178                                  ldb_dn_get_linearized(msg->dn)));
1179                         return LDB_ERR_OPERATIONS_ERROR;
1180                 }
1181                 *seq_num = find_max_local_usn(omd);
1182
1183                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs2,
1184                                             DSDB_FLAG_NEXT_MODULE |
1185                                             DSDB_SEARCH_SHOW_RECYCLED |
1186                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1187                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1188                                             DSDB_SEARCH_REVEAL_INTERNALS, req);
1189
1190                 if (ret != LDB_SUCCESS || res->count != 1) {
1191                         DEBUG(0,(__location__ ": Object %s failed to find uSNChanged\n",
1192                                  ldb_dn_get_linearized(msg->dn)));
1193                         return LDB_ERR_OPERATIONS_ERROR;
1194                 }
1195
1196                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1197                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1198                                                                 situation)) {
1199                         *is_urgent = true;
1200                 }
1201
1202                 db_seq = ldb_msg_find_attr_as_uint64(res->msgs[0], "uSNChanged", 0);
1203                 if (*seq_num <= db_seq) {
1204                         DEBUG(0,(__location__ ": changereplmetada control provided but max(local_usn)"\
1205                                               " is less or equal to uSNChanged (max = %lld uSNChanged = %lld)\n",
1206                                  (long long)*seq_num, (long long)db_seq));
1207                         return LDB_ERR_OPERATIONS_ERROR;
1208                 }
1209
1210         } else {
1211                 /* search for the existing replPropertyMetaDataBlob. We need
1212                  * to use REVEAL and ask for DNs in storage format to support
1213                  * the check for values being the same in
1214                  * replmd_update_rpmd_element()
1215                  */
1216                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
1217                                             DSDB_FLAG_NEXT_MODULE |
1218                                             DSDB_SEARCH_SHOW_RECYCLED |
1219                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1220                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1221                                             DSDB_SEARCH_REVEAL_INTERNALS, req);
1222                 if (ret != LDB_SUCCESS || res->count != 1) {
1223                         DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1224                                  ldb_dn_get_linearized(msg->dn)));
1225                         return LDB_ERR_OPERATIONS_ERROR;
1226                 }
1227
1228                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1229                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1230                                                                 situation)) {
1231                         *is_urgent = true;
1232                 }
1233
1234                 omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1235                 if (!omd_value) {
1236                         DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1237                                  ldb_dn_get_linearized(msg->dn)));
1238                         return LDB_ERR_OPERATIONS_ERROR;
1239                 }
1240
1241                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1242                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1243                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1244                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1245                                  ldb_dn_get_linearized(msg->dn)));
1246                         return LDB_ERR_OPERATIONS_ERROR;
1247                 }
1248
1249                 if (omd.version != 1) {
1250                         DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1251                                  omd.version, ldb_dn_get_linearized(msg->dn)));
1252                         return LDB_ERR_OPERATIONS_ERROR;
1253                 }
1254
1255                 for (i=0; i<msg->num_elements; i++) {
1256                         struct ldb_message_element *old_el;
1257                         old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1258                         ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1259                                                          our_invocation_id, now);
1260                         if (ret != LDB_SUCCESS) {
1261                                 return ret;
1262                         }
1263
1264                         if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1265                                 *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1266                         }
1267
1268                 }
1269         }
1270         /*
1271          * replmd_update_rpmd_element has done an update if the
1272          * seq_num is set
1273          */
1274         if (*seq_num != 0) {
1275                 struct ldb_val *md_value;
1276                 struct ldb_message_element *el;
1277
1278                 /*if we are RODC and this is a DRSR update then its ok*/
1279                 if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
1280                         ret = samdb_rodc(ldb, &rodc);
1281                         if (ret != LDB_SUCCESS) {
1282                                 DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
1283                         } else if (rodc) {
1284                                 ldb_asprintf_errstring(ldb, "RODC modify is forbidden\n");
1285                                 return LDB_ERR_REFERRAL;
1286                         }
1287                 }
1288
1289                 md_value = talloc(msg, struct ldb_val);
1290                 if (md_value == NULL) {
1291                         ldb_oom(ldb);
1292                         return LDB_ERR_OPERATIONS_ERROR;
1293                 }
1294
1295                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1296                 if (ret != LDB_SUCCESS) {
1297                         return ret;
1298                 }
1299
1300                 ndr_err = ndr_push_struct_blob(md_value, msg, &omd,
1301                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1302                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1303                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1304                                  ldb_dn_get_linearized(msg->dn)));
1305                         return LDB_ERR_OPERATIONS_ERROR;
1306                 }
1307
1308                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1309                 if (ret != LDB_SUCCESS) {
1310                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1311                                  ldb_dn_get_linearized(msg->dn)));
1312                         return ret;
1313                 }
1314
1315                 el->num_values = 1;
1316                 el->values = md_value;
1317         }
1318
1319         return LDB_SUCCESS;
1320 }
1321
1322 struct parsed_dn {
1323         struct dsdb_dn *dsdb_dn;
1324         struct GUID *guid;
1325         struct ldb_val *v;
1326 };
1327
1328 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1329 {
1330         return GUID_compare(pdn1->guid, pdn2->guid);
1331 }
1332
1333 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn,
1334                                         unsigned int count, struct GUID *guid,
1335                                         struct ldb_dn *dn)
1336 {
1337         struct parsed_dn *ret;
1338         unsigned int i;
1339         if (dn && GUID_all_zero(guid)) {
1340                 /* when updating a link using DRS, we sometimes get a
1341                    NULL GUID. We then need to try and match by DN */
1342                 for (i=0; i<count; i++) {
1343                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1344                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1345                                 return &pdn[i];
1346                         }
1347                 }
1348                 return NULL;
1349         }
1350         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1351         return ret;
1352 }
1353
1354 /*
1355   get a series of message element values as an array of DNs and GUIDs
1356   the result is sorted by GUID
1357  */
1358 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1359                           struct ldb_message_element *el, struct parsed_dn **pdn,
1360                           const char *ldap_oid, struct ldb_request *parent)
1361 {
1362         unsigned int i;
1363         struct ldb_context *ldb = ldb_module_get_ctx(module);
1364
1365         if (el == NULL) {
1366                 *pdn = NULL;
1367                 return LDB_SUCCESS;
1368         }
1369
1370         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1371         if (!*pdn) {
1372                 ldb_module_oom(module);
1373                 return LDB_ERR_OPERATIONS_ERROR;
1374         }
1375
1376         for (i=0; i<el->num_values; i++) {
1377                 struct ldb_val *v = &el->values[i];
1378                 NTSTATUS status;
1379                 struct ldb_dn *dn;
1380                 struct parsed_dn *p;
1381
1382                 p = &(*pdn)[i];
1383
1384                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1385                 if (p->dsdb_dn == NULL) {
1386                         return LDB_ERR_INVALID_DN_SYNTAX;
1387                 }
1388
1389                 dn = p->dsdb_dn->dn;
1390
1391                 p->guid = talloc(*pdn, struct GUID);
1392                 if (p->guid == NULL) {
1393                         ldb_module_oom(module);
1394                         return LDB_ERR_OPERATIONS_ERROR;
1395                 }
1396
1397                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1398                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1399                         /* we got a DN without a GUID - go find the GUID */
1400                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid, parent);
1401                         if (ret != LDB_SUCCESS) {
1402                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1403                                                        ldb_dn_get_linearized(dn));
1404                                 return ret;
1405                         }
1406                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1407                         if (ret != LDB_SUCCESS) {
1408                                 return ret;
1409                         }
1410                 } else if (!NT_STATUS_IS_OK(status)) {
1411                         return LDB_ERR_OPERATIONS_ERROR;
1412                 }
1413
1414                 /* keep a pointer to the original ldb_val */
1415                 p->v = v;
1416         }
1417
1418         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1419
1420         return LDB_SUCCESS;
1421 }
1422
1423 /*
1424   build a new extended DN, including all meta data fields
1425
1426   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1427   RMD_ADDTIME         = originating_add_time
1428   RMD_INVOCID         = originating_invocation_id
1429   RMD_CHANGETIME      = originating_change_time
1430   RMD_ORIGINATING_USN = originating_usn
1431   RMD_LOCAL_USN       = local_usn
1432   RMD_VERSION         = version
1433  */
1434 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1435                                const struct GUID *invocation_id, uint64_t seq_num,
1436                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1437 {
1438         struct ldb_dn *dn = dsdb_dn->dn;
1439         const char *tstring, *usn_string, *flags_string;
1440         struct ldb_val tval;
1441         struct ldb_val iid;
1442         struct ldb_val usnv, local_usnv;
1443         struct ldb_val vers, flagsv;
1444         NTSTATUS status;
1445         int ret;
1446         const char *dnstring;
1447         char *vstring;
1448         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1449
1450         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1451         if (!tstring) {
1452                 return LDB_ERR_OPERATIONS_ERROR;
1453         }
1454         tval = data_blob_string_const(tstring);
1455
1456         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1457         if (!usn_string) {
1458                 return LDB_ERR_OPERATIONS_ERROR;
1459         }
1460         usnv = data_blob_string_const(usn_string);
1461
1462         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1463         if (!usn_string) {
1464                 return LDB_ERR_OPERATIONS_ERROR;
1465         }
1466         local_usnv = data_blob_string_const(usn_string);
1467
1468         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1469         if (!vstring) {
1470                 return LDB_ERR_OPERATIONS_ERROR;
1471         }
1472         vers = data_blob_string_const(vstring);
1473
1474         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1475         if (!NT_STATUS_IS_OK(status)) {
1476                 return LDB_ERR_OPERATIONS_ERROR;
1477         }
1478
1479         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1480         if (!flags_string) {
1481                 return LDB_ERR_OPERATIONS_ERROR;
1482         }
1483         flagsv = data_blob_string_const(flags_string);
1484
1485         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1486         if (ret != LDB_SUCCESS) return ret;
1487         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1488         if (ret != LDB_SUCCESS) return ret;
1489         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1490         if (ret != LDB_SUCCESS) return ret;
1491         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1492         if (ret != LDB_SUCCESS) return ret;
1493         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1494         if (ret != LDB_SUCCESS) return ret;
1495         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1496         if (ret != LDB_SUCCESS) return ret;
1497         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1498         if (ret != LDB_SUCCESS) return ret;
1499
1500         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1501         if (dnstring == NULL) {
1502                 return LDB_ERR_OPERATIONS_ERROR;
1503         }
1504         *v = data_blob_string_const(dnstring);
1505
1506         return LDB_SUCCESS;
1507 }
1508
1509 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1510                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1511                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1512                                 uint32_t version, bool deleted);
1513
1514 /*
1515   check if any links need upgrading from w2k format
1516
1517   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.
1518  */
1519 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1520 {
1521         uint32_t i;
1522         for (i=0; i<count; i++) {
1523                 NTSTATUS status;
1524                 uint32_t version;
1525                 int ret;
1526
1527                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1528                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1529                         continue;
1530                 }
1531
1532                 /* it's an old one that needs upgrading */
1533                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1534                                            1, 1, 0, 0, false);
1535                 if (ret != LDB_SUCCESS) {
1536                         return ret;
1537                 }
1538         }
1539         return LDB_SUCCESS;
1540 }
1541
1542 /*
1543   update an extended DN, including all meta data fields
1544
1545   see replmd_build_la_val for value names
1546  */
1547 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1548                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1549                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1550                                 uint32_t version, bool deleted)
1551 {
1552         struct ldb_dn *dn = dsdb_dn->dn;
1553         const char *tstring, *usn_string, *flags_string;
1554         struct ldb_val tval;
1555         struct ldb_val iid;
1556         struct ldb_val usnv, local_usnv;
1557         struct ldb_val vers, flagsv;
1558         const struct ldb_val *old_addtime;
1559         uint32_t old_version;
1560         NTSTATUS status;
1561         int ret;
1562         const char *dnstring;
1563         char *vstring;
1564         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1565
1566         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1567         if (!tstring) {
1568                 return LDB_ERR_OPERATIONS_ERROR;
1569         }
1570         tval = data_blob_string_const(tstring);
1571
1572         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1573         if (!usn_string) {
1574                 return LDB_ERR_OPERATIONS_ERROR;
1575         }
1576         usnv = data_blob_string_const(usn_string);
1577
1578         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1579         if (!usn_string) {
1580                 return LDB_ERR_OPERATIONS_ERROR;
1581         }
1582         local_usnv = data_blob_string_const(usn_string);
1583
1584         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1585         if (!NT_STATUS_IS_OK(status)) {
1586                 return LDB_ERR_OPERATIONS_ERROR;
1587         }
1588
1589         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1590         if (!flags_string) {
1591                 return LDB_ERR_OPERATIONS_ERROR;
1592         }
1593         flagsv = data_blob_string_const(flags_string);
1594
1595         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1596         if (ret != LDB_SUCCESS) return ret;
1597
1598         /* get the ADDTIME from the original */
1599         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1600         if (old_addtime == NULL) {
1601                 old_addtime = &tval;
1602         }
1603         if (dsdb_dn != old_dsdb_dn) {
1604                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1605                 if (ret != LDB_SUCCESS) return ret;
1606         }
1607
1608         /* use our invocation id */
1609         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1610         if (ret != LDB_SUCCESS) return ret;
1611
1612         /* changetime is the current time */
1613         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1614         if (ret != LDB_SUCCESS) return ret;
1615
1616         /* update the USN */
1617         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1618         if (ret != LDB_SUCCESS) return ret;
1619
1620         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1621         if (ret != LDB_SUCCESS) return ret;
1622
1623         /* increase the version by 1 */
1624         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1625         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1626                 version = old_version+1;
1627         }
1628         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1629         vers = data_blob_string_const(vstring);
1630         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1631         if (ret != LDB_SUCCESS) return ret;
1632
1633         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1634         if (dnstring == NULL) {
1635                 return LDB_ERR_OPERATIONS_ERROR;
1636         }
1637         *v = data_blob_string_const(dnstring);
1638
1639         return LDB_SUCCESS;
1640 }
1641
1642 /*
1643   handle adding a linked attribute
1644  */
1645 static int replmd_modify_la_add(struct ldb_module *module,
1646                                 const struct dsdb_schema *schema,
1647                                 struct ldb_message *msg,
1648                                 struct ldb_message_element *el,
1649                                 struct ldb_message_element *old_el,
1650                                 const struct dsdb_attribute *schema_attr,
1651                                 uint64_t seq_num,
1652                                 time_t t,
1653                                 struct GUID *msg_guid,
1654                                 struct ldb_request *parent)
1655 {
1656         unsigned int i;
1657         struct parsed_dn *dns, *old_dns;
1658         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1659         int ret;
1660         struct ldb_val *new_values = NULL;
1661         unsigned int num_new_values = 0;
1662         unsigned old_num_values = old_el?old_el->num_values:0;
1663         const struct GUID *invocation_id;
1664         struct ldb_context *ldb = ldb_module_get_ctx(module);
1665         NTTIME now;
1666
1667         unix_to_nt_time(&now, t);
1668
1669         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
1670         if (ret != LDB_SUCCESS) {
1671                 talloc_free(tmp_ctx);
1672                 return ret;
1673         }
1674
1675         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
1676         if (ret != LDB_SUCCESS) {
1677                 talloc_free(tmp_ctx);
1678                 return ret;
1679         }
1680
1681         invocation_id = samdb_ntds_invocation_id(ldb);
1682         if (!invocation_id) {
1683                 talloc_free(tmp_ctx);
1684                 return LDB_ERR_OPERATIONS_ERROR;
1685         }
1686
1687         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1688         if (ret != LDB_SUCCESS) {
1689                 talloc_free(tmp_ctx);
1690                 return ret;
1691         }
1692
1693         /* for each new value, see if it exists already with the same GUID */
1694         for (i=0; i<el->num_values; i++) {
1695                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1696                 if (p == NULL) {
1697                         /* this is a new linked attribute value */
1698                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1699                         if (new_values == NULL) {
1700                                 ldb_module_oom(module);
1701                                 talloc_free(tmp_ctx);
1702                                 return LDB_ERR_OPERATIONS_ERROR;
1703                         }
1704                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1705                                                   invocation_id, seq_num, seq_num, now, 0, false);
1706                         if (ret != LDB_SUCCESS) {
1707                                 talloc_free(tmp_ctx);
1708                                 return ret;
1709                         }
1710                         num_new_values++;
1711                 } else {
1712                         /* this is only allowed if the GUID was
1713                            previously deleted. */
1714                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1715
1716                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1717                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1718                                                        el->name, GUID_string(tmp_ctx, p->guid));
1719                                 talloc_free(tmp_ctx);
1720                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1721                         }
1722                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1723                                                    invocation_id, seq_num, seq_num, now, 0, false);
1724                         if (ret != LDB_SUCCESS) {
1725                                 talloc_free(tmp_ctx);
1726                                 return ret;
1727                         }
1728                 }
1729
1730                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1731                 if (ret != LDB_SUCCESS) {
1732                         talloc_free(tmp_ctx);
1733                         return ret;
1734                 }
1735         }
1736
1737         /* add the new ones on to the end of the old values, constructing a new el->values */
1738         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1739                                     struct ldb_val,
1740                                     old_num_values+num_new_values);
1741         if (el->values == NULL) {
1742                 ldb_module_oom(module);
1743                 return LDB_ERR_OPERATIONS_ERROR;
1744         }
1745
1746         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1747         el->num_values = old_num_values + num_new_values;
1748
1749         talloc_steal(msg->elements, el->values);
1750         talloc_steal(el->values, new_values);
1751
1752         talloc_free(tmp_ctx);
1753
1754         /* we now tell the backend to replace all existing values
1755            with the one we have constructed */
1756         el->flags = LDB_FLAG_MOD_REPLACE;
1757
1758         return LDB_SUCCESS;
1759 }
1760
1761
1762 /*
1763   handle deleting all active linked attributes
1764  */
1765 static int replmd_modify_la_delete(struct ldb_module *module,
1766                                    const struct dsdb_schema *schema,
1767                                    struct ldb_message *msg,
1768                                    struct ldb_message_element *el,
1769                                    struct ldb_message_element *old_el,
1770                                    const struct dsdb_attribute *schema_attr,
1771                                    uint64_t seq_num,
1772                                    time_t t,
1773                                    struct GUID *msg_guid,
1774                                    struct ldb_request *parent)
1775 {
1776         unsigned int i;
1777         struct parsed_dn *dns, *old_dns;
1778         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1779         int ret;
1780         const struct GUID *invocation_id;
1781         struct ldb_context *ldb = ldb_module_get_ctx(module);
1782         NTTIME now;
1783
1784         unix_to_nt_time(&now, t);
1785
1786         /* check if there is nothing to delete */
1787         if ((!old_el || old_el->num_values == 0) &&
1788             el->num_values == 0) {
1789                 return LDB_SUCCESS;
1790         }
1791
1792         if (!old_el || old_el->num_values == 0) {
1793                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1794         }
1795
1796         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
1797         if (ret != LDB_SUCCESS) {
1798                 talloc_free(tmp_ctx);
1799                 return ret;
1800         }
1801
1802         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
1803         if (ret != LDB_SUCCESS) {
1804                 talloc_free(tmp_ctx);
1805                 return ret;
1806         }
1807
1808         invocation_id = samdb_ntds_invocation_id(ldb);
1809         if (!invocation_id) {
1810                 return LDB_ERR_OPERATIONS_ERROR;
1811         }
1812
1813         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
1814         if (ret != LDB_SUCCESS) {
1815                 talloc_free(tmp_ctx);
1816                 return ret;
1817         }
1818
1819         el->values = NULL;
1820
1821         /* see if we are being asked to delete any links that
1822            don't exist or are already deleted */
1823         for (i=0; i<el->num_values; i++) {
1824                 struct parsed_dn *p = &dns[i];
1825                 struct parsed_dn *p2;
1826                 uint32_t rmd_flags;
1827
1828                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1829                 if (!p2) {
1830                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1831                                                el->name, GUID_string(tmp_ctx, p->guid));
1832                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1833                 }
1834                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1835                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1836                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1837                                                el->name, GUID_string(tmp_ctx, p->guid));
1838                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1839                 }
1840         }
1841
1842         /* for each new value, see if it exists already with the same GUID
1843            if it is not already deleted and matches the delete list then delete it
1844         */
1845         for (i=0; i<old_el->num_values; i++) {
1846                 struct parsed_dn *p = &old_dns[i];
1847                 uint32_t rmd_flags;
1848
1849                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1850                         continue;
1851                 }
1852
1853                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1854                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1855
1856                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1857                                            invocation_id, seq_num, seq_num, now, 0, true);
1858                 if (ret != LDB_SUCCESS) {
1859                         talloc_free(tmp_ctx);
1860                         return ret;
1861                 }
1862
1863                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1864                 if (ret != LDB_SUCCESS) {
1865                         talloc_free(tmp_ctx);
1866                         return ret;
1867                 }
1868         }
1869
1870         el->values = talloc_steal(msg->elements, old_el->values);
1871         el->num_values = old_el->num_values;
1872
1873         talloc_free(tmp_ctx);
1874
1875         /* we now tell the backend to replace all existing values
1876            with the one we have constructed */
1877         el->flags = LDB_FLAG_MOD_REPLACE;
1878
1879         return LDB_SUCCESS;
1880 }
1881
1882 /*
1883   handle replacing a linked attribute
1884  */
1885 static int replmd_modify_la_replace(struct ldb_module *module,
1886                                     const struct dsdb_schema *schema,
1887                                     struct ldb_message *msg,
1888                                     struct ldb_message_element *el,
1889                                     struct ldb_message_element *old_el,
1890                                     const struct dsdb_attribute *schema_attr,
1891                                     uint64_t seq_num,
1892                                     time_t t,
1893                                     struct GUID *msg_guid,
1894                                     struct ldb_request *parent)
1895 {
1896         unsigned int i;
1897         struct parsed_dn *dns, *old_dns;
1898         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1899         int ret;
1900         const struct GUID *invocation_id;
1901         struct ldb_context *ldb = ldb_module_get_ctx(module);
1902         struct ldb_val *new_values = NULL;
1903         unsigned int num_new_values = 0;
1904         unsigned int old_num_values = old_el?old_el->num_values:0;
1905         NTTIME now;
1906
1907         unix_to_nt_time(&now, t);
1908
1909         /* check if there is nothing to replace */
1910         if ((!old_el || old_el->num_values == 0) &&
1911             el->num_values == 0) {
1912                 return LDB_SUCCESS;
1913         }
1914
1915         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
1916         if (ret != LDB_SUCCESS) {
1917                 talloc_free(tmp_ctx);
1918                 return ret;
1919         }
1920
1921         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
1922         if (ret != LDB_SUCCESS) {
1923                 talloc_free(tmp_ctx);
1924                 return ret;
1925         }
1926
1927         invocation_id = samdb_ntds_invocation_id(ldb);
1928         if (!invocation_id) {
1929                 return LDB_ERR_OPERATIONS_ERROR;
1930         }
1931
1932         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1933         if (ret != LDB_SUCCESS) {
1934                 talloc_free(tmp_ctx);
1935                 return ret;
1936         }
1937
1938         /* mark all the old ones as deleted */
1939         for (i=0; i<old_num_values; i++) {
1940                 struct parsed_dn *old_p = &old_dns[i];
1941                 struct parsed_dn *p;
1942                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1943
1944                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1945
1946                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1947                 if (ret != LDB_SUCCESS) {
1948                         talloc_free(tmp_ctx);
1949                         return ret;
1950                 }
1951
1952                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1953                 if (p) {
1954                         /* we don't delete it if we are re-adding it */
1955                         continue;
1956                 }
1957
1958                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1959                                            invocation_id, seq_num, seq_num, now, 0, true);
1960                 if (ret != LDB_SUCCESS) {
1961                         talloc_free(tmp_ctx);
1962                         return ret;
1963                 }
1964         }
1965
1966         /* for each new value, either update its meta-data, or add it
1967          * to old_el
1968         */
1969         for (i=0; i<el->num_values; i++) {
1970                 struct parsed_dn *p = &dns[i], *old_p;
1971
1972                 if (old_dns &&
1973                     (old_p = parsed_dn_find(old_dns,
1974                                             old_num_values, p->guid, NULL)) != NULL) {
1975                         /* update in place */
1976                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1977                                                    old_p->dsdb_dn, invocation_id,
1978                                                    seq_num, seq_num, now, 0, false);
1979                         if (ret != LDB_SUCCESS) {
1980                                 talloc_free(tmp_ctx);
1981                                 return ret;
1982                         }
1983                 } else {
1984                         /* add a new one */
1985                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1986                                                     num_new_values+1);
1987                         if (new_values == NULL) {
1988                                 ldb_module_oom(module);
1989                                 talloc_free(tmp_ctx);
1990                                 return LDB_ERR_OPERATIONS_ERROR;
1991                         }
1992                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1993                                                   invocation_id, seq_num, seq_num, now, 0, false);
1994                         if (ret != LDB_SUCCESS) {
1995                                 talloc_free(tmp_ctx);
1996                                 return ret;
1997                         }
1998                         num_new_values++;
1999                 }
2000
2001                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
2002                 if (ret != LDB_SUCCESS) {
2003                         talloc_free(tmp_ctx);
2004                         return ret;
2005                 }
2006         }
2007
2008         /* add the new values to the end of old_el */
2009         if (num_new_values != 0) {
2010                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
2011                                             struct ldb_val, old_num_values+num_new_values);
2012                 if (el->values == NULL) {
2013                         ldb_module_oom(module);
2014                         return LDB_ERR_OPERATIONS_ERROR;
2015                 }
2016                 memcpy(&el->values[old_num_values], &new_values[0],
2017                        sizeof(struct ldb_val)*num_new_values);
2018                 el->num_values = old_num_values + num_new_values;
2019                 talloc_steal(msg->elements, new_values);
2020         } else {
2021                 el->values = old_el->values;
2022                 el->num_values = old_el->num_values;
2023                 talloc_steal(msg->elements, el->values);
2024         }
2025
2026         talloc_free(tmp_ctx);
2027
2028         /* we now tell the backend to replace all existing values
2029            with the one we have constructed */
2030         el->flags = LDB_FLAG_MOD_REPLACE;
2031
2032         return LDB_SUCCESS;
2033 }
2034
2035
2036 /*
2037   handle linked attributes in modify requests
2038  */
2039 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
2040                                                struct ldb_message *msg,
2041                                                uint64_t seq_num, time_t t,
2042                                                struct ldb_request *parent)
2043 {
2044         struct ldb_result *res;
2045         unsigned int i;
2046         int ret;
2047         struct ldb_context *ldb = ldb_module_get_ctx(module);
2048         struct ldb_message *old_msg;
2049
2050         const struct dsdb_schema *schema;
2051         struct GUID old_guid;
2052
2053         if (seq_num == 0) {
2054                 /* there the replmd_update_rpmd code has already
2055                  * checked and saw that there are no linked
2056                  * attributes */
2057                 return LDB_SUCCESS;
2058         }
2059
2060         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
2061                 /* don't do anything special for linked attributes */
2062                 return LDB_SUCCESS;
2063         }
2064
2065         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
2066                                     DSDB_FLAG_NEXT_MODULE |
2067                                     DSDB_SEARCH_SHOW_RECYCLED |
2068                                     DSDB_SEARCH_REVEAL_INTERNALS |
2069                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT,
2070                                     parent);
2071         if (ret != LDB_SUCCESS) {
2072                 return ret;
2073         }
2074         schema = dsdb_get_schema(ldb, res);
2075         if (!schema) {
2076                 return LDB_ERR_OPERATIONS_ERROR;
2077         }
2078
2079         old_msg = res->msgs[0];
2080
2081         old_guid = samdb_result_guid(old_msg, "objectGUID");
2082
2083         for (i=0; i<msg->num_elements; i++) {
2084                 struct ldb_message_element *el = &msg->elements[i];
2085                 struct ldb_message_element *old_el, *new_el;
2086                 const struct dsdb_attribute *schema_attr
2087                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2088                 if (!schema_attr) {
2089                         ldb_asprintf_errstring(ldb,
2090                                                "%s: attribute %s is not a valid attribute in schema",
2091                                                __FUNCTION__, el->name);
2092                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
2093                 }
2094                 if (schema_attr->linkID == 0) {
2095                         continue;
2096                 }
2097                 if ((schema_attr->linkID & 1) == 1) {
2098                         /* Odd is for the target.  Illegal to modify */
2099                         ldb_asprintf_errstring(ldb,
2100                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
2101                         return LDB_ERR_UNWILLING_TO_PERFORM;
2102                 }
2103                 old_el = ldb_msg_find_element(old_msg, el->name);
2104                 switch (el->flags & LDB_FLAG_MOD_MASK) {
2105                 case LDB_FLAG_MOD_REPLACE:
2106                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2107                         break;
2108                 case LDB_FLAG_MOD_DELETE:
2109                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2110                         break;
2111                 case LDB_FLAG_MOD_ADD:
2112                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2113                         break;
2114                 default:
2115                         ldb_asprintf_errstring(ldb,
2116                                                "invalid flags 0x%x for %s linked attribute",
2117                                                el->flags, el->name);
2118                         return LDB_ERR_UNWILLING_TO_PERFORM;
2119                 }
2120                 if (ret != LDB_SUCCESS) {
2121                         return ret;
2122                 }
2123                 if (old_el) {
2124                         ldb_msg_remove_attr(old_msg, el->name);
2125                 }
2126                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2127                 new_el->num_values = el->num_values;
2128                 new_el->values = talloc_steal(msg->elements, el->values);
2129
2130                 /* TODO: this relises a bit too heavily on the exact
2131                    behaviour of ldb_msg_find_element and
2132                    ldb_msg_remove_element */
2133                 old_el = ldb_msg_find_element(msg, el->name);
2134                 if (old_el != el) {
2135                         ldb_msg_remove_element(msg, old_el);
2136                         i--;
2137                 }
2138         }
2139
2140         talloc_free(res);
2141         return ret;
2142 }
2143
2144
2145
2146 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2147 {
2148         struct ldb_context *ldb;
2149         struct replmd_replicated_request *ac;
2150         struct ldb_request *down_req;
2151         struct ldb_message *msg;
2152         time_t t = time(NULL);
2153         int ret;
2154         bool is_urgent = false;
2155         struct loadparm_context *lp_ctx;
2156         char *referral;
2157         unsigned int functional_level;
2158         const DATA_BLOB *guid_blob;
2159
2160         /* do not manipulate our control entries */
2161         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2162                 return ldb_next_request(module, req);
2163         }
2164
2165         ldb = ldb_module_get_ctx(module);
2166
2167         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2168
2169         guid_blob = ldb_msg_find_ldb_val(req->op.mod.message, "objectGUID");
2170         if ( guid_blob != NULL ) {
2171                 ldb_set_errstring(ldb,
2172                                   "replmd_modify: it's not allowed to change the objectGUID!");
2173                 return LDB_ERR_CONSTRAINT_VIOLATION;
2174         }
2175
2176         ac = replmd_ctx_init(module, req);
2177         if (ac == NULL) {
2178                 return ldb_module_oom(module);
2179         }
2180
2181         functional_level = dsdb_functional_level(ldb);
2182
2183         lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2184                                  struct loadparm_context);
2185
2186         /* we have to copy the message as the caller might have it as a const */
2187         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2188         if (msg == NULL) {
2189                 ldb_oom(ldb);
2190                 talloc_free(ac);
2191                 return LDB_ERR_OPERATIONS_ERROR;
2192         }
2193
2194         ldb_msg_remove_attr(msg, "whenChanged");
2195         ldb_msg_remove_attr(msg, "uSNChanged");
2196
2197         ret = replmd_update_rpmd(module, ac->schema, req, msg, &ac->seq_num, t, &is_urgent);
2198         if (ret == LDB_ERR_REFERRAL) {
2199                 referral = talloc_asprintf(req,
2200                                            "ldap://%s/%s",
2201                                            lpcfg_dnsdomain(lp_ctx),
2202                                            ldb_dn_get_linearized(msg->dn));
2203                 ret = ldb_module_send_referral(req, referral);
2204                 talloc_free(ac);
2205                 return ldb_module_done(req, NULL, NULL, ret);
2206         }
2207
2208         if (ret != LDB_SUCCESS) {
2209                 talloc_free(ac);
2210                 return ret;
2211         }
2212
2213         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t, req);
2214         if (ret != LDB_SUCCESS) {
2215                 talloc_free(ac);
2216                 return ret;
2217         }
2218
2219         /* TODO:
2220          * - replace the old object with the newly constructed one
2221          */
2222
2223         ac->is_urgent = is_urgent;
2224
2225         ret = ldb_build_mod_req(&down_req, ldb, ac,
2226                                 msg,
2227                                 req->controls,
2228                                 ac, replmd_op_callback,
2229                                 req);
2230         LDB_REQ_SET_LOCATION(down_req);
2231         if (ret != LDB_SUCCESS) {
2232                 talloc_free(ac);
2233                 return ret;
2234         }
2235
2236         /* If we are in functional level 2000, then
2237          * replmd_modify_handle_linked_attribs will have done
2238          * nothing */
2239         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
2240                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
2241                 if (ret != LDB_SUCCESS) {
2242                         talloc_free(ac);
2243                         return ret;
2244                 }
2245         }
2246
2247         talloc_steal(down_req, msg);
2248
2249         /* we only change whenChanged and uSNChanged if the seq_num
2250            has changed */
2251         if (ac->seq_num != 0) {
2252                 ret = add_time_element(msg, "whenChanged", t);
2253                 if (ret != LDB_SUCCESS) {
2254                         talloc_free(ac);
2255                         return ret;
2256                 }
2257
2258                 ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
2259                 if (ret != LDB_SUCCESS) {
2260                         talloc_free(ac);
2261                         return ret;
2262                 }
2263         }
2264
2265         /* go on with the call chain */
2266         return ldb_next_request(module, down_req);
2267 }
2268
2269 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2270
2271 /*
2272   handle a rename request
2273
2274   On a rename we need to do an extra ldb_modify which sets the
2275   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2276  */
2277 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2278 {
2279         struct ldb_context *ldb;
2280         struct replmd_replicated_request *ac;
2281         int ret;
2282         struct ldb_request *down_req;
2283
2284         /* do not manipulate our control entries */
2285         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2286                 return ldb_next_request(module, req);
2287         }
2288
2289         ldb = ldb_module_get_ctx(module);
2290
2291         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2292
2293         ac = replmd_ctx_init(module, req);
2294         if (ac == NULL) {
2295                 return ldb_module_oom(module);
2296         }
2297
2298         ret = ldb_build_rename_req(&down_req, ldb, ac,
2299                                    ac->req->op.rename.olddn,
2300                                    ac->req->op.rename.newdn,
2301                                    ac->req->controls,
2302                                    ac, replmd_rename_callback,
2303                                    ac->req);
2304         LDB_REQ_SET_LOCATION(down_req);
2305         if (ret != LDB_SUCCESS) {
2306                 talloc_free(ac);
2307                 return ret;
2308         }
2309
2310         /* go on with the call chain */
2311         return ldb_next_request(module, down_req);
2312 }
2313
2314 /* After the rename is compleated, update the whenchanged etc */
2315 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2316 {
2317         struct ldb_context *ldb;
2318         struct replmd_replicated_request *ac;
2319         struct ldb_request *down_req;
2320         struct ldb_message *msg;
2321         time_t t = time(NULL);
2322         int ret;
2323
2324         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2325         ldb = ldb_module_get_ctx(ac->module);
2326
2327         if (ares->error != LDB_SUCCESS) {
2328                 return ldb_module_done(ac->req, ares->controls,
2329                                         ares->response, ares->error);
2330         }
2331
2332         if (ares->type != LDB_REPLY_DONE) {
2333                 ldb_set_errstring(ldb,
2334                                   "invalid ldb_reply_type in callback");
2335                 talloc_free(ares);
2336                 return ldb_module_done(ac->req, NULL, NULL,
2337                                         LDB_ERR_OPERATIONS_ERROR);
2338         }
2339
2340         /* Get a sequence number from the backend */
2341         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2342         if (ret != LDB_SUCCESS) {
2343                 return ret;
2344         }
2345
2346         /* TODO:
2347          * - replace the old object with the newly constructed one
2348          */
2349
2350         msg = ldb_msg_new(ac);
2351         if (msg == NULL) {
2352                 ldb_oom(ldb);
2353                 return LDB_ERR_OPERATIONS_ERROR;
2354         }
2355
2356         msg->dn = ac->req->op.rename.newdn;
2357
2358         ret = ldb_build_mod_req(&down_req, ldb, ac,
2359                                 msg,
2360                                 req->controls,
2361                                 ac, replmd_op_callback,
2362                                 req);
2363         LDB_REQ_SET_LOCATION(down_req);
2364         if (ret != LDB_SUCCESS) {
2365                 talloc_free(ac);
2366                 return ret;
2367         }
2368         talloc_steal(down_req, msg);
2369
2370         ret = add_time_element(msg, "whenChanged", t);
2371         if (ret != LDB_SUCCESS) {
2372                 talloc_free(ac);
2373                 return ret;
2374         }
2375
2376         ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
2377         if (ret != LDB_SUCCESS) {
2378                 talloc_free(ac);
2379                 return ret;
2380         }
2381
2382         /* go on with the call chain - do the modify after the rename */
2383         return ldb_next_request(ac->module, down_req);
2384 }
2385
2386 /*
2387    remove links from objects that point at this object when an object
2388    is deleted
2389  */
2390 static int replmd_delete_remove_link(struct ldb_module *module,
2391                                      const struct dsdb_schema *schema,
2392                                      struct ldb_dn *dn,
2393                                      struct ldb_message_element *el,
2394                                      const struct dsdb_attribute *sa,
2395                                      struct ldb_request *parent)
2396 {
2397         unsigned int i;
2398         TALLOC_CTX *tmp_ctx = talloc_new(module);
2399         struct ldb_context *ldb = ldb_module_get_ctx(module);
2400
2401         for (i=0; i<el->num_values; i++) {
2402                 struct dsdb_dn *dsdb_dn;
2403                 NTSTATUS status;
2404                 int ret;
2405                 struct GUID guid2;
2406                 struct ldb_message *msg;
2407                 const struct dsdb_attribute *target_attr;
2408                 struct ldb_message_element *el2;
2409                 struct ldb_val dn_val;
2410
2411                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2412                         continue;
2413                 }
2414
2415                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2416                 if (!dsdb_dn) {
2417                         talloc_free(tmp_ctx);
2418                         return LDB_ERR_OPERATIONS_ERROR;
2419                 }
2420
2421                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2422                 if (!NT_STATUS_IS_OK(status)) {
2423                         talloc_free(tmp_ctx);
2424                         return LDB_ERR_OPERATIONS_ERROR;
2425                 }
2426
2427                 /* remove the link */
2428                 msg = ldb_msg_new(tmp_ctx);
2429                 if (!msg) {
2430                         ldb_module_oom(module);
2431                         talloc_free(tmp_ctx);
2432                         return LDB_ERR_OPERATIONS_ERROR;
2433                 }
2434
2435
2436                 msg->dn = dsdb_dn->dn;
2437
2438                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2439                 if (target_attr == NULL) {
2440                         continue;
2441                 }
2442
2443                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2444                 if (ret != LDB_SUCCESS) {
2445                         ldb_module_oom(module);
2446                         talloc_free(tmp_ctx);
2447                         return LDB_ERR_OPERATIONS_ERROR;
2448                 }
2449                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2450                 el2->values = &dn_val;
2451                 el2->num_values = 1;
2452
2453                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE, parent);
2454                 if (ret != LDB_SUCCESS) {
2455                         talloc_free(tmp_ctx);
2456                         return ret;
2457                 }
2458         }
2459         talloc_free(tmp_ctx);
2460         return LDB_SUCCESS;
2461 }
2462
2463
2464 /*
2465   handle update of replication meta data for deletion of objects
2466
2467   This also handles the mapping of delete to a rename operation
2468   to allow deletes to be replicated.
2469  */
2470 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2471 {
2472         int ret = LDB_ERR_OTHER;
2473         bool retb, disallow_move_on_delete;
2474         struct ldb_dn *old_dn, *new_dn;
2475         const char *rdn_name;
2476         const struct ldb_val *rdn_value, *new_rdn_value;
2477         struct GUID guid;
2478         struct ldb_context *ldb = ldb_module_get_ctx(module);
2479         const struct dsdb_schema *schema;
2480         struct ldb_message *msg, *old_msg;
2481         struct ldb_message_element *el;
2482         TALLOC_CTX *tmp_ctx;
2483         struct ldb_result *res, *parent_res;
2484         const char *preserved_attrs[] = {
2485                 /* yes, this really is a hard coded list. See MS-ADTS
2486                    section 3.1.1.5.5.1.1 */
2487                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2488                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2489                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2490                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2491                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2492                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2493                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2494                 "whenChanged", NULL};
2495         unsigned int i, el_count = 0;
2496         enum deletion_state { OBJECT_NOT_DELETED=1, OBJECT_DELETED=2, OBJECT_RECYCLED=3,
2497                                                 OBJECT_TOMBSTONE=4, OBJECT_REMOVED=5 };
2498         enum deletion_state deletion_state, next_deletion_state;
2499         bool enabled;
2500
2501         if (ldb_dn_is_special(req->op.del.dn)) {
2502                 return ldb_next_request(module, req);
2503         }
2504
2505         tmp_ctx = talloc_new(ldb);
2506         if (!tmp_ctx) {
2507                 ldb_oom(ldb);
2508                 return LDB_ERR_OPERATIONS_ERROR;
2509         }
2510
2511         schema = dsdb_get_schema(ldb, tmp_ctx);
2512         if (!schema) {
2513                 return LDB_ERR_OPERATIONS_ERROR;
2514         }
2515
2516         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2517
2518         /* we need the complete msg off disk, so we can work out which
2519            attributes need to be removed */
2520         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2521                                     DSDB_FLAG_NEXT_MODULE |
2522                                     DSDB_SEARCH_SHOW_RECYCLED |
2523                                     DSDB_SEARCH_REVEAL_INTERNALS |
2524                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT, req);
2525         if (ret != LDB_SUCCESS) {
2526                 talloc_free(tmp_ctx);
2527                 return ret;
2528         }
2529         old_msg = res->msgs[0];
2530
2531
2532         ret = dsdb_recyclebin_enabled(module, &enabled);
2533         if (ret != LDB_SUCCESS) {
2534                 talloc_free(tmp_ctx);
2535                 return ret;
2536         }
2537
2538         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2539                 if (!enabled) {
2540                         deletion_state = OBJECT_TOMBSTONE;
2541                         next_deletion_state = OBJECT_REMOVED;
2542                 } else if (ldb_msg_check_string_attribute(old_msg, "isRecycled", "TRUE")) {
2543                         deletion_state = OBJECT_RECYCLED;
2544                         next_deletion_state = OBJECT_REMOVED;
2545                 } else {
2546                         deletion_state = OBJECT_DELETED;
2547                         next_deletion_state = OBJECT_RECYCLED;
2548                 }
2549         } else {
2550                 deletion_state = OBJECT_NOT_DELETED;
2551                 if (enabled) {
2552                         next_deletion_state = OBJECT_DELETED;
2553                 } else {
2554                         next_deletion_state = OBJECT_TOMBSTONE;
2555                 }
2556         }
2557
2558         if (next_deletion_state == OBJECT_REMOVED) {
2559                 struct auth_session_info *session_info =
2560                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2561                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2562                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2563                                         ldb_dn_get_linearized(old_msg->dn));
2564                         return LDB_ERR_UNWILLING_TO_PERFORM;
2565                 }
2566
2567                 /* it is already deleted - really remove it this time */
2568                 talloc_free(tmp_ctx);
2569                 return ldb_next_request(module, req);
2570         }
2571
2572         rdn_name = ldb_dn_get_rdn_name(old_dn);
2573         rdn_value = ldb_dn_get_rdn_val(old_dn);
2574         if ((rdn_name == NULL) || (rdn_value == NULL)) {
2575                 talloc_free(tmp_ctx);
2576                 return ldb_operr(ldb);
2577         }
2578
2579         msg = ldb_msg_new(tmp_ctx);
2580         if (msg == NULL) {
2581                 ldb_module_oom(module);
2582                 talloc_free(tmp_ctx);
2583                 return LDB_ERR_OPERATIONS_ERROR;
2584         }
2585
2586         msg->dn = old_dn;
2587
2588         if (deletion_state == OBJECT_NOT_DELETED){
2589                 /* consider the SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE flag */
2590                 disallow_move_on_delete =
2591                         (ldb_msg_find_attr_as_int(old_msg, "systemFlags", 0)
2592                                 & SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE);
2593
2594                 /* work out where we will be renaming this object to */
2595                 if (!disallow_move_on_delete) {
2596                         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn,
2597                                                           &new_dn);
2598                         if (ret != LDB_SUCCESS) {
2599                                 /* this is probably an attempted delete on a partition
2600                                  * that doesn't allow delete operations, such as the
2601                                  * schema partition */
2602                                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2603                                                            ldb_dn_get_linearized(old_dn));
2604                                 talloc_free(tmp_ctx);
2605                                 return LDB_ERR_UNWILLING_TO_PERFORM;
2606                         }
2607                 } else {
2608                         new_dn = ldb_dn_get_parent(tmp_ctx, old_dn);
2609                         if (new_dn == NULL) {
2610                                 ldb_module_oom(module);
2611                                 talloc_free(tmp_ctx);
2612                                 return LDB_ERR_OPERATIONS_ERROR;
2613                         }
2614                 }
2615
2616                 /* get the objects GUID from the search we just did */
2617                 guid = samdb_result_guid(old_msg, "objectGUID");
2618
2619                 /* Add a formatted child */
2620                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2621                                                 rdn_name,
2622                                                 ldb_dn_escape_value(tmp_ctx, *rdn_value),
2623                                                 GUID_string(tmp_ctx, &guid));
2624                 if (!retb) {
2625                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2626                                         ldb_dn_get_linearized(new_dn)));
2627                         talloc_free(tmp_ctx);
2628                         return LDB_ERR_OPERATIONS_ERROR;
2629                 }
2630
2631                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2632                 if (ret != LDB_SUCCESS) {
2633                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2634                         ldb_module_oom(module);
2635                         talloc_free(tmp_ctx);
2636                         return ret;
2637                 }
2638                 msg->elements[el_count++].flags = LDB_FLAG_MOD_REPLACE;
2639         }
2640
2641         /*
2642           now we need to modify the object in the following ways:
2643
2644           - add isDeleted=TRUE
2645           - update rDN and name, with new rDN
2646           - remove linked attributes
2647           - remove objectCategory and sAMAccountType
2648           - remove attribs not on the preserved list
2649              - preserved if in above list, or is rDN
2650           - remove all linked attribs from this object
2651           - remove all links from other objects to this object
2652           - add lastKnownParent
2653           - update replPropertyMetaData?
2654
2655           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2656          */
2657
2658         /* we need the storage form of the parent GUID */
2659         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2660                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2661                                     DSDB_FLAG_NEXT_MODULE |
2662                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2663                                     DSDB_SEARCH_REVEAL_INTERNALS|
2664                                     DSDB_SEARCH_SHOW_RECYCLED, req);
2665         if (ret != LDB_SUCCESS) {
2666                 talloc_free(tmp_ctx);
2667                 return ret;
2668         }
2669
2670         if (deletion_state == OBJECT_NOT_DELETED){
2671                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2672                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2673                 if (ret != LDB_SUCCESS) {
2674                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2675                         ldb_module_oom(module);
2676                         talloc_free(tmp_ctx);
2677                         return ret;
2678                 }
2679                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2680         }
2681
2682         switch (next_deletion_state){
2683
2684         case OBJECT_DELETED:
2685
2686                 ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
2687                 if (ret != LDB_SUCCESS) {
2688                         DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
2689                         ldb_module_oom(module);
2690                         talloc_free(tmp_ctx);
2691                         return ret;
2692                 }
2693                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2694
2695                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_DELETE, NULL);
2696                 if (ret != LDB_SUCCESS) {
2697                         talloc_free(tmp_ctx);
2698                         ldb_module_oom(module);
2699                         return ret;
2700                 }
2701
2702                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_DELETE, NULL);
2703                 if (ret != LDB_SUCCESS) {
2704                         talloc_free(tmp_ctx);
2705                         ldb_module_oom(module);
2706                         return ret;
2707                 }
2708
2709                 break;
2710
2711         case OBJECT_RECYCLED:
2712         case OBJECT_TOMBSTONE:
2713
2714                 /* we also mark it as recycled, meaning this object can't be
2715                    recovered (we are stripping its attributes) */
2716                 if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2717                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2718                         if (ret != LDB_SUCCESS) {
2719                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2720                                 ldb_module_oom(module);
2721                                 talloc_free(tmp_ctx);
2722                                 return ret;
2723                         }
2724                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2725                 }
2726
2727                 /* work out which of the old attributes we will be removing */
2728                 for (i=0; i<old_msg->num_elements; i++) {
2729                         const struct dsdb_attribute *sa;
2730                         el = &old_msg->elements[i];
2731                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2732                         if (!sa) {
2733                                 talloc_free(tmp_ctx);
2734                                 return LDB_ERR_OPERATIONS_ERROR;
2735                         }
2736                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2737                                 /* don't remove the rDN */
2738                                 continue;
2739                         }
2740                         if (sa->linkID && sa->linkID & 1) {
2741                                 ret = replmd_delete_remove_link(module, schema, old_dn, el, sa, req);
2742                                 if (ret != LDB_SUCCESS) {
2743                                         talloc_free(tmp_ctx);
2744                                         return LDB_ERR_OPERATIONS_ERROR;
2745                                 }
2746                                 continue;
2747                         }
2748                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2749                                 continue;
2750                         }
2751                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2752                         if (ret != LDB_SUCCESS) {
2753                                 talloc_free(tmp_ctx);
2754                                 ldb_module_oom(module);
2755                                 return ret;
2756                         }
2757                 }
2758                 break;
2759
2760         default:
2761                 break;
2762         }
2763
2764         if (deletion_state == OBJECT_NOT_DELETED) {
2765                 const struct dsdb_attribute *sa;
2766
2767                 /* work out what the new rdn value is, for updating the
2768                    rDN and name fields */
2769                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2770                 if (new_rdn_value == NULL) {
2771                         talloc_free(tmp_ctx);
2772                         return ldb_operr(ldb);
2773                 }
2774
2775                 sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
2776                 if (!sa) {
2777                         talloc_free(tmp_ctx);
2778                         return LDB_ERR_OPERATIONS_ERROR;
2779                 }
2780
2781                 ret = ldb_msg_add_value(msg, sa->lDAPDisplayName, new_rdn_value,
2782                                         &el);
2783                 if (ret != LDB_SUCCESS) {
2784                         talloc_free(tmp_ctx);
2785                         return ret;
2786                 }
2787                 el->flags = LDB_FLAG_MOD_REPLACE;
2788
2789                 el = ldb_msg_find_element(old_msg, "name");
2790                 if (el) {
2791                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2792                         if (ret != LDB_SUCCESS) {
2793                                 talloc_free(tmp_ctx);
2794                                 return ret;
2795                         }
2796                         el->flags = LDB_FLAG_MOD_REPLACE;
2797                 }
2798         }
2799
2800         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE, req);
2801         if (ret != LDB_SUCCESS) {
2802                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2803                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2804                 talloc_free(tmp_ctx);
2805                 return ret;
2806         }
2807
2808         if (deletion_state == OBJECT_NOT_DELETED) {
2809                 /* now rename onto the new DN */
2810                 ret = dsdb_module_rename(module, old_dn, new_dn, DSDB_FLAG_NEXT_MODULE, req);
2811                 if (ret != LDB_SUCCESS){
2812                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2813                                  ldb_dn_get_linearized(old_dn),
2814                                  ldb_dn_get_linearized(new_dn),
2815                                  ldb_errstring(ldb)));
2816                         talloc_free(tmp_ctx);
2817                         return ret;
2818                 }
2819         }
2820
2821         talloc_free(tmp_ctx);
2822
2823         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2824 }
2825
2826
2827
2828 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2829 {
2830         return ret;
2831 }
2832
2833 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2834 {
2835         int ret = LDB_ERR_OTHER;
2836         /* TODO: do some error mapping */
2837         return ret;
2838 }
2839
2840 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2841 {
2842         struct ldb_context *ldb;
2843         struct ldb_request *change_req;
2844         enum ndr_err_code ndr_err;
2845         struct ldb_message *msg;
2846         struct replPropertyMetaDataBlob *md;
2847         struct ldb_val md_value;
2848         unsigned int i;
2849         int ret;
2850
2851         /*
2852          * TODO: check if the parent object exist
2853          */
2854
2855         /*
2856          * TODO: handle the conflict case where an object with the
2857          *       same name exist
2858          */
2859
2860         ldb = ldb_module_get_ctx(ar->module);
2861         msg = ar->objs->objects[ar->index_current].msg;
2862         md = ar->objs->objects[ar->index_current].meta_data;
2863
2864         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2865         if (ret != LDB_SUCCESS) {
2866                 return replmd_replicated_request_error(ar, ret);
2867         }
2868
2869         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2870         if (ret != LDB_SUCCESS) {
2871                 return replmd_replicated_request_error(ar, ret);
2872         }
2873
2874         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2875         if (ret != LDB_SUCCESS) {
2876                 return replmd_replicated_request_error(ar, ret);
2877         }
2878
2879         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2880         if (ret != LDB_SUCCESS) {
2881                 return replmd_replicated_request_error(ar, ret);
2882         }
2883
2884         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2885         if (ret != LDB_SUCCESS) {
2886                 return replmd_replicated_request_error(ar, ret);
2887         }
2888
2889         /* remove any message elements that have zero values */
2890         for (i=0; i<msg->num_elements; i++) {
2891                 struct ldb_message_element *el = &msg->elements[i];
2892
2893                 if (el->num_values == 0) {
2894                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2895                                  el->name));
2896                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2897                         msg->num_elements--;
2898                         i--;
2899                         continue;
2900                 }
2901         }
2902
2903         /*
2904          * the meta data array is already sorted by the caller
2905          */
2906         for (i=0; i < md->ctr.ctr1.count; i++) {
2907                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2908         }
2909         ndr_err = ndr_push_struct_blob(&md_value, msg, md,
2910                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2911         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2912                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2913                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2914         }
2915         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2916         if (ret != LDB_SUCCESS) {
2917                 return replmd_replicated_request_error(ar, ret);
2918         }
2919
2920         replmd_ldb_message_sort(msg, ar->schema);
2921
2922         if (DEBUGLVL(4)) {
2923                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2924                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2925                 talloc_free(s);
2926         }
2927
2928         ret = ldb_build_add_req(&change_req,
2929                                 ldb,
2930                                 ar,
2931                                 msg,
2932                                 ar->controls,
2933                                 ar,
2934                                 replmd_op_callback,
2935                                 ar->req);
2936         LDB_REQ_SET_LOCATION(change_req);
2937         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2938
2939         return ldb_next_request(ar->module, change_req);
2940 }
2941
2942 /*
2943    return true if an update is newer than an existing entry
2944    see section 5.11 of MS-ADTS
2945 */
2946 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2947                                    const struct GUID *update_invocation_id,
2948                                    uint32_t current_version,
2949                                    uint32_t update_version,
2950                                    NTTIME current_change_time,
2951                                    NTTIME update_change_time)
2952 {
2953         if (update_version != current_version) {
2954                 return update_version >= current_version;
2955         }
2956         if (update_change_time != current_change_time) {
2957                 return update_change_time >= current_change_time;
2958         }
2959         return GUID_compare(update_invocation_id, current_invocation_id) >= 0;
2960 }
2961
2962 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2963                                                   struct replPropertyMetaData1 *new_m)
2964 {
2965         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2966                                       &new_m->originating_invocation_id,
2967                                       cur_m->version,
2968                                       new_m->version,
2969                                       cur_m->originating_change_time,
2970                                       new_m->originating_change_time);
2971 }
2972
2973 static struct replPropertyMetaData1 *
2974 replmd_replPropertyMetaData1_find_attid(struct replPropertyMetaDataBlob *md_blob,
2975                                         enum drsuapi_DsAttributeId attid)
2976 {
2977         uint32_t i;
2978         struct replPropertyMetaDataCtr1 *rpmd_ctr = &md_blob->ctr.ctr1;
2979
2980         for (i = 0; i < rpmd_ctr->count; i++) {
2981                 if (rpmd_ctr->array[i].attid == attid) {
2982                         return &rpmd_ctr->array[i];
2983                 }
2984         }
2985         return NULL;
2986 }
2987
2988
2989 /*
2990   handle renames that come in over DRS replication
2991  */
2992 static int replmd_replicated_handle_rename(struct replmd_replicated_request *ar,
2993                                            struct ldb_message *msg,
2994                                            struct replPropertyMetaDataBlob *rmd,
2995                                            struct replPropertyMetaDataBlob *omd,
2996                                            struct ldb_request *parent)
2997 {
2998         struct replPropertyMetaData1 *md_remote;
2999         struct replPropertyMetaData1 *md_local;
3000
3001         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) == 0) {
3002                 /* no rename */
3003                 return LDB_SUCCESS;
3004         }
3005
3006         /* now we need to check for double renames. We could have a
3007          * local rename pending which our replication partner hasn't
3008          * received yet. We choose which one wins by looking at the
3009          * attribute stamps on the two objects, the newer one wins
3010          */
3011         md_remote = replmd_replPropertyMetaData1_find_attid(rmd, DRSUAPI_ATTID_name);
3012         md_local  = replmd_replPropertyMetaData1_find_attid(omd, DRSUAPI_ATTID_name);
3013         /* if there is no name attribute then we have to assume the
3014            object we've received is in fact newer */
3015         if (!md_remote || !md_local ||
3016             replmd_replPropertyMetaData1_is_newer(md_local, md_remote)) {
3017                 DEBUG(4,("replmd_replicated_request rename %s => %s\n",
3018                          ldb_dn_get_linearized(ar->search_msg->dn),
3019                          ldb_dn_get_linearized(msg->dn)));
3020                 /* pass rename to the next module
3021                  * so it doesn't appear as an originating update */
3022                 return dsdb_module_rename(ar->module,
3023                                           ar->search_msg->dn, msg->dn,
3024                                           DSDB_FLAG_NEXT_MODULE | DSDB_MODIFY_RELAX, parent);
3025         }
3026
3027         /* we're going to keep our old object */
3028         DEBUG(4,(__location__ ": Keeping object %s and rejecting older rename to %s\n",
3029                  ldb_dn_get_linearized(ar->search_msg->dn),
3030                  ldb_dn_get_linearized(msg->dn)));
3031         return LDB_SUCCESS;
3032 }
3033
3034
3035 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
3036 {
3037         struct ldb_context *ldb;
3038         struct ldb_request *change_req;
3039         enum ndr_err_code ndr_err;
3040         struct ldb_message *msg;
3041         struct replPropertyMetaDataBlob *rmd;
3042         struct replPropertyMetaDataBlob omd;
3043         const struct ldb_val *omd_value;
3044         struct replPropertyMetaDataBlob nmd;
3045         struct ldb_val nmd_value;
3046         unsigned int i;
3047         uint32_t j,ni=0;
3048         unsigned int removed_attrs = 0;
3049         int ret;
3050
3051         ldb = ldb_module_get_ctx(ar->module);
3052         msg = ar->objs->objects[ar->index_current].msg;
3053         rmd = ar->objs->objects[ar->index_current].meta_data;
3054         ZERO_STRUCT(omd);
3055         omd.version = 1;
3056
3057         /* find existing meta data */
3058         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
3059         if (omd_value) {
3060                 ndr_err = ndr_pull_struct_blob(omd_value, ar, &omd,
3061                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
3062                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3063                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3064                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3065                 }
3066
3067                 if (omd.version != 1) {
3068                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3069                 }
3070         }
3071
3072         /* handle renames that come in over DRS */
3073         ret = replmd_replicated_handle_rename(ar, msg, rmd, &omd, ar->req);
3074         if (ret != LDB_SUCCESS) {
3075                 ldb_debug(ldb, LDB_DEBUG_FATAL,
3076                           "replmd_replicated_request rename %s => %s failed - %s\n",
3077                           ldb_dn_get_linearized(ar->search_msg->dn),
3078                           ldb_dn_get_linearized(msg->dn),
3079                           ldb_errstring(ldb));
3080                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
3081         }
3082
3083         ZERO_STRUCT(nmd);
3084         nmd.version = 1;
3085         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
3086         nmd.ctr.ctr1.array = talloc_array(ar,
3087                                           struct replPropertyMetaData1,
3088                                           nmd.ctr.ctr1.count);
3089         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3090
3091         /* first copy the old meta data */
3092         for (i=0; i < omd.ctr.ctr1.count; i++) {
3093                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
3094                 ni++;
3095         }
3096
3097         /* now merge in the new meta data */
3098         for (i=0; i < rmd->ctr.ctr1.count; i++) {
3099                 bool found = false;
3100
3101                 for (j=0; j < ni; j++) {
3102                         bool cmp;
3103
3104                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
3105                                 continue;
3106                         }
3107
3108                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
3109                                                                     &rmd->ctr.ctr1.array[i]);
3110                         if (cmp) {
3111                                 /* replace the entry */
3112                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
3113                                 found = true;
3114                                 break;
3115                         }
3116
3117                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTID_instanceType) {
3118                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
3119                                          msg->elements[i-removed_attrs].name,
3120                                          ldb_dn_get_linearized(msg->dn),
3121                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
3122                         }
3123
3124                         /* we don't want to apply this change so remove the attribute */
3125                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
3126                         removed_attrs++;
3127
3128                         found = true;
3129                         break;
3130                 }
3131
3132                 if (found) continue;
3133
3134                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
3135                 ni++;
3136         }
3137
3138         /*
3139          * finally correct the size of the meta_data array
3140          */
3141         nmd.ctr.ctr1.count = ni;
3142
3143         /*
3144          * the rdn attribute (the alias for the name attribute),
3145          * 'cn' for most objects is the last entry in the meta data array
3146          * we have stored
3147          *
3148          * sort the new meta data array
3149          */
3150         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
3151         if (ret != LDB_SUCCESS) {
3152                 return ret;
3153         }
3154
3155         /*
3156          * check if some replicated attributes left, otherwise skip the ldb_modify() call
3157          */
3158         if (msg->num_elements == 0) {
3159                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
3160                           ar->index_current);
3161
3162                 ar->index_current++;
3163                 return replmd_replicated_apply_next(ar);
3164         }
3165
3166         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
3167                   ar->index_current, msg->num_elements);
3168
3169         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
3170         if (ret != LDB_SUCCESS) {
3171                 return replmd_replicated_request_error(ar, ret);
3172         }
3173
3174         for (i=0; i<ni; i++) {
3175                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
3176         }
3177
3178         /* create the meta data value */
3179         ndr_err = ndr_push_struct_blob(&nmd_value, msg, &nmd,
3180                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
3181         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3182                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3183                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3184         }
3185
3186         /*
3187          * when we know that we'll modify the record, add the whenChanged, uSNChanged
3188          * and replPopertyMetaData attributes
3189          */
3190         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
3191         if (ret != LDB_SUCCESS) {
3192                 return replmd_replicated_request_error(ar, ret);
3193         }
3194         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
3195         if (ret != LDB_SUCCESS) {
3196                 return replmd_replicated_request_error(ar, ret);
3197         }
3198         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
3199         if (ret != LDB_SUCCESS) {
3200                 return replmd_replicated_request_error(ar, ret);
3201         }
3202
3203         replmd_ldb_message_sort(msg, ar->schema);
3204
3205         /* we want to replace the old values */
3206         for (i=0; i < msg->num_elements; i++) {
3207                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
3208         }
3209
3210         if (DEBUGLVL(4)) {
3211                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3212                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
3213                 talloc_free(s);
3214         }
3215
3216         ret = ldb_build_mod_req(&change_req,
3217                                 ldb,
3218                                 ar,
3219                                 msg,
3220                                 ar->controls,
3221                                 ar,
3222                                 replmd_op_callback,
3223                                 ar->req);
3224         LDB_REQ_SET_LOCATION(change_req);
3225         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3226
3227         return ldb_next_request(ar->module, change_req);
3228 }
3229
3230 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
3231                                                    struct ldb_reply *ares)
3232 {
3233         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3234                                                struct replmd_replicated_request);
3235         int ret;
3236
3237         if (!ares) {
3238                 return ldb_module_done(ar->req, NULL, NULL,
3239                                         LDB_ERR_OPERATIONS_ERROR);
3240         }
3241         if (ares->error != LDB_SUCCESS &&
3242             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3243                 return ldb_module_done(ar->req, ares->controls,
3244                                         ares->response, ares->error);
3245         }
3246
3247         switch (ares->type) {
3248         case LDB_REPLY_ENTRY:
3249                 ar->search_msg = talloc_steal(ar, ares->message);
3250                 break;
3251
3252         case LDB_REPLY_REFERRAL:
3253                 /* we ignore referrals */
3254                 break;
3255
3256         case LDB_REPLY_DONE:
3257                 if (ar->search_msg != NULL) {
3258                         ret = replmd_replicated_apply_merge(ar);
3259                 } else {
3260                         ret = replmd_replicated_apply_add(ar);
3261                 }
3262                 if (ret != LDB_SUCCESS) {
3263                         return ldb_module_done(ar->req, NULL, NULL, ret);
3264                 }
3265         }
3266
3267         talloc_free(ares);
3268         return LDB_SUCCESS;
3269 }
3270
3271 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
3272
3273 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
3274 {
3275         struct ldb_context *ldb;
3276         int ret;
3277         char *tmp_str;
3278         char *filter;
3279         struct ldb_request *search_req;
3280         struct ldb_search_options_control *options;
3281
3282         if (ar->index_current >= ar->objs->num_objects) {
3283                 /* done with it, go to next stage */
3284                 return replmd_replicated_uptodate_vector(ar);
3285         }
3286
3287         ldb = ldb_module_get_ctx(ar->module);
3288         ar->search_msg = NULL;
3289
3290         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
3291         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3292
3293         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
3294         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3295         talloc_free(tmp_str);
3296
3297         ret = ldb_build_search_req(&search_req,
3298                                    ldb,
3299                                    ar,
3300                                    NULL,
3301                                    LDB_SCOPE_SUBTREE,
3302                                    filter,
3303                                    NULL,
3304                                    NULL,
3305                                    ar,
3306                                    replmd_replicated_apply_search_callback,
3307                                    ar->req);
3308         LDB_REQ_SET_LOCATION(search_req);
3309
3310         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_RECYCLED_OID,
3311                                       true, NULL);
3312         if (ret != LDB_SUCCESS) {
3313                 return ret;
3314         }
3315
3316         /* we need to cope with cross-partition links, so search for
3317            the GUID over all partitions */
3318         options = talloc(search_req, struct ldb_search_options_control);
3319         if (options == NULL) {
3320                 DEBUG(0, (__location__ ": out of memory\n"));
3321                 return LDB_ERR_OPERATIONS_ERROR;
3322         }
3323         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
3324
3325         ret = ldb_request_add_control(search_req,
3326                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
3327                                       true, options);
3328         if (ret != LDB_SUCCESS) {
3329                 return ret;
3330         }
3331
3332         return ldb_next_request(ar->module, search_req);
3333 }
3334
3335 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
3336                                                       struct ldb_reply *ares)
3337 {
3338         struct ldb_context *ldb;
3339         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3340                                                struct replmd_replicated_request);
3341         ldb = ldb_module_get_ctx(ar->module);
3342
3343         if (!ares) {
3344                 return ldb_module_done(ar->req, NULL, NULL,
3345                                         LDB_ERR_OPERATIONS_ERROR);
3346         }
3347         if (ares->error != LDB_SUCCESS) {
3348                 return ldb_module_done(ar->req, ares->controls,
3349                                         ares->response, ares->error);
3350         }
3351
3352         if (ares->type != LDB_REPLY_DONE) {
3353                 ldb_set_errstring(ldb, "Invalid reply type\n!");
3354                 return ldb_module_done(ar->req, NULL, NULL,
3355                                         LDB_ERR_OPERATIONS_ERROR);
3356         }
3357
3358         talloc_free(ares);
3359
3360         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3361 }
3362
3363 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3364 {
3365         struct ldb_context *ldb;
3366         struct ldb_request *change_req;
3367         enum ndr_err_code ndr_err;
3368         struct ldb_message *msg;
3369         struct replUpToDateVectorBlob ouv;
3370         const struct ldb_val *ouv_value;
3371         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3372         struct replUpToDateVectorBlob nuv;
3373         struct ldb_val nuv_value;
3374         struct ldb_message_element *nuv_el = NULL;
3375         const struct GUID *our_invocation_id;
3376         struct ldb_message_element *orf_el = NULL;
3377         struct repsFromToBlob nrf;
3378         struct ldb_val *nrf_value = NULL;
3379         struct ldb_message_element *nrf_el = NULL;
3380         unsigned int i;
3381         uint32_t j,ni=0;
3382         bool found = false;
3383         time_t t = time(NULL);
3384         NTTIME now;
3385         int ret;
3386         uint32_t instanceType;
3387
3388         ldb = ldb_module_get_ctx(ar->module);
3389         ruv = ar->objs->uptodateness_vector;
3390         ZERO_STRUCT(ouv);
3391         ouv.version = 2;
3392         ZERO_STRUCT(nuv);
3393         nuv.version = 2;
3394
3395         unix_to_nt_time(&now, t);
3396
3397         instanceType = ldb_msg_find_attr_as_uint(ar->search_msg, "instanceType", 0);
3398         if (! (instanceType & INSTANCE_TYPE_IS_NC_HEAD)) {
3399                 DEBUG(4,(__location__ ": Skipping UDV and repsFrom update as not NC root: %s\n",
3400                          ldb_dn_get_linearized(ar->search_msg->dn)));
3401                 return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3402         }
3403
3404         /*
3405          * first create the new replUpToDateVector
3406          */
3407         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3408         if (ouv_value) {
3409                 ndr_err = ndr_pull_struct_blob(ouv_value, ar, &ouv,
3410                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3411                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3412                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3413                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3414                 }
3415
3416                 if (ouv.version != 2) {
3417                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3418                 }
3419         }
3420
3421         /*
3422          * the new uptodateness vector will at least
3423          * contain 1 entry, one for the source_dsa
3424          *
3425          * plus optional values from our old vector and the one from the source_dsa
3426          */
3427         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3428         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3429         nuv.ctr.ctr2.cursors = talloc_array(ar,
3430                                             struct drsuapi_DsReplicaCursor2,
3431                                             nuv.ctr.ctr2.count);
3432         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3433
3434         /* first copy the old vector */
3435         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3436                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3437                 ni++;
3438         }
3439
3440         /* get our invocation_id if we have one already attached to the ldb */
3441         our_invocation_id = samdb_ntds_invocation_id(ldb);
3442
3443         /* merge in the source_dsa vector is available */
3444         for (i=0; (ruv && i < ruv->count); i++) {
3445                 found = false;
3446
3447                 if (our_invocation_id &&
3448                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3449                                our_invocation_id)) {
3450                         continue;
3451                 }
3452
3453                 for (j=0; j < ni; j++) {
3454                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3455                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3456                                 continue;
3457                         }
3458
3459                         found = true;
3460
3461                         /*
3462                          * we update only the highest_usn and not the latest_sync_success time,
3463                          * because the last success stands for direct replication
3464                          */
3465                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3466                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3467                         }
3468                         break;
3469                 }
3470
3471                 if (found) continue;
3472
3473                 /* if it's not there yet, add it */
3474                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3475                 ni++;
3476         }
3477
3478         /*
3479          * merge in the current highwatermark for the source_dsa
3480          */
3481         found = false;
3482         for (j=0; j < ni; j++) {
3483                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3484                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3485                         continue;
3486                 }
3487
3488                 found = true;
3489
3490                 /*
3491                  * here we update the highest_usn and last_sync_success time
3492                  * because we're directly replicating from the source_dsa
3493                  *
3494                  * and use the tmp_highest_usn because this is what we have just applied
3495                  * to our ldb
3496                  */
3497                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3498                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3499                 break;
3500         }
3501         if (!found) {
3502                 /*
3503                  * here we update the highest_usn and last_sync_success time
3504                  * because we're directly replicating from the source_dsa
3505                  *
3506                  * and use the tmp_highest_usn because this is what we have just applied
3507                  * to our ldb
3508                  */
3509                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3510                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3511                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3512                 ni++;
3513         }
3514
3515         /*
3516          * finally correct the size of the cursors array
3517          */
3518         nuv.ctr.ctr2.count = ni;
3519
3520         /*
3521          * sort the cursors
3522          */
3523         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
3524
3525         /*
3526          * create the change ldb_message
3527          */
3528         msg = ldb_msg_new(ar);
3529         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3530         msg->dn = ar->search_msg->dn;
3531
3532         ndr_err = ndr_push_struct_blob(&nuv_value, msg, &nuv,
3533                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3534         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3535                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3536                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3537         }
3538         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3539         if (ret != LDB_SUCCESS) {
3540                 return replmd_replicated_request_error(ar, ret);
3541         }
3542         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3543
3544         /*
3545          * now create the new repsFrom value from the given repsFromTo1 structure
3546          */
3547         ZERO_STRUCT(nrf);
3548         nrf.version                                     = 1;
3549         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3550         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3551
3552         /*
3553          * first see if we already have a repsFrom value for the current source dsa
3554          * if so we'll later replace this value
3555          */
3556         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3557         if (orf_el) {
3558                 for (i=0; i < orf_el->num_values; i++) {
3559                         struct repsFromToBlob *trf;
3560
3561                         trf = talloc(ar, struct repsFromToBlob);
3562                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3563
3564                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, trf,
3565                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3566                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3567                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3568                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3569                         }
3570
3571                         if (trf->version != 1) {
3572                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3573                         }
3574
3575                         /*
3576                          * we compare the source dsa objectGUID not the invocation_id
3577                          * because we want only one repsFrom value per source dsa
3578                          * and when the invocation_id of the source dsa has changed we don't need
3579                          * the old repsFrom with the old invocation_id
3580                          */
3581                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3582                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3583                                 talloc_free(trf);
3584                                 continue;
3585                         }
3586
3587                         talloc_free(trf);
3588                         nrf_value = &orf_el->values[i];
3589                         break;
3590                 }
3591
3592                 /*
3593                  * copy over all old values to the new ldb_message
3594                  */
3595                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3596                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3597                 *nrf_el = *orf_el;
3598         }
3599
3600         /*
3601          * if we haven't found an old repsFrom value for the current source dsa
3602          * we'll add a new value
3603          */
3604         if (!nrf_value) {
3605                 struct ldb_val zero_value;
3606                 ZERO_STRUCT(zero_value);
3607                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3608                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3609
3610                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3611         }
3612
3613         /* we now fill the value which is already attached to ldb_message */
3614         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3615                                        &nrf,
3616                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3617         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3618                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3619                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3620         }
3621
3622         /*
3623          * the ldb_message_element for the attribute, has all the old values and the new one
3624          * so we'll replace the whole attribute with all values
3625          */
3626         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3627
3628         if (DEBUGLVL(4)) {
3629                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3630                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3631                 talloc_free(s);
3632         }
3633
3634         /* prepare the ldb_modify() request */
3635         ret = ldb_build_mod_req(&change_req,
3636                                 ldb,
3637                                 ar,
3638                                 msg,
3639                                 ar->controls,
3640                                 ar,
3641                                 replmd_replicated_uptodate_modify_callback,
3642                                 ar->req);
3643         LDB_REQ_SET_LOCATION(change_req);
3644         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3645
3646         return ldb_next_request(ar->module, change_req);
3647 }
3648
3649 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3650                                                       struct ldb_reply *ares)
3651 {
3652         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3653                                                struct replmd_replicated_request);
3654         int ret;
3655
3656         if (!ares) {
3657                 return ldb_module_done(ar->req, NULL, NULL,
3658                                         LDB_ERR_OPERATIONS_ERROR);
3659         }
3660         if (ares->error != LDB_SUCCESS &&
3661             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3662                 return ldb_module_done(ar->req, ares->controls,
3663                                         ares->response, ares->error);
3664         }
3665
3666         switch (ares->type) {
3667         case LDB_REPLY_ENTRY:
3668                 ar->search_msg = talloc_steal(ar, ares->message);
3669                 break;
3670
3671         case LDB_REPLY_REFERRAL:
3672                 /* we ignore referrals */
3673                 break;
3674
3675         case LDB_REPLY_DONE:
3676                 if (ar->search_msg == NULL) {
3677                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3678                 } else {
3679                         ret = replmd_replicated_uptodate_modify(ar);
3680                 }
3681                 if (ret != LDB_SUCCESS) {
3682                         return ldb_module_done(ar->req, NULL, NULL, ret);
3683                 }
3684         }
3685
3686         talloc_free(ares);
3687         return LDB_SUCCESS;
3688 }
3689
3690
3691 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3692 {
3693         struct ldb_context *ldb;
3694         int ret;
3695         static const char *attrs[] = {
3696                 "replUpToDateVector",
3697                 "repsFrom",
3698                 "instanceType",
3699                 NULL
3700         };
3701         struct ldb_request *search_req;
3702
3703         ldb = ldb_module_get_ctx(ar->module);
3704         ar->search_msg = NULL;
3705
3706         ret = ldb_build_search_req(&search_req,
3707                                    ldb,
3708                                    ar,
3709                                    ar->objs->partition_dn,
3710                                    LDB_SCOPE_BASE,
3711                                    "(objectClass=*)",
3712                                    attrs,
3713                                    NULL,
3714                                    ar,
3715                                    replmd_replicated_uptodate_search_callback,
3716                                    ar->req);
3717         LDB_REQ_SET_LOCATION(search_req);
3718         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3719
3720         return ldb_next_request(ar->module, search_req);
3721 }
3722
3723
3724
3725 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3726 {
3727         struct ldb_context *ldb;
3728         struct dsdb_extended_replicated_objects *objs;
3729         struct replmd_replicated_request *ar;
3730         struct ldb_control **ctrls;
3731         int ret;
3732         uint32_t i;
3733         struct replmd_private *replmd_private =
3734                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3735
3736         ldb = ldb_module_get_ctx(module);
3737
3738         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3739
3740         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3741         if (!objs) {
3742                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3743                 return LDB_ERR_PROTOCOL_ERROR;
3744         }
3745
3746         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3747                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3748                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3749                 return LDB_ERR_PROTOCOL_ERROR;
3750         }
3751
3752         ar = replmd_ctx_init(module, req);
3753         if (!ar)
3754                 return LDB_ERR_OPERATIONS_ERROR;
3755
3756         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3757         ar->apply_mode = true;
3758         ar->objs = objs;
3759         ar->schema = dsdb_get_schema(ldb, ar);
3760         if (!ar->schema) {
3761                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3762                 talloc_free(ar);
3763                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3764                 return LDB_ERR_CONSTRAINT_VIOLATION;
3765         }
3766
3767         ctrls = req->controls;
3768
3769         if (req->controls) {
3770                 req->controls = talloc_memdup(ar, req->controls,
3771                                               talloc_get_size(req->controls));
3772                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3773         }
3774
3775         /* This allows layers further down to know if a change came in over replication */
3776         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3777         if (ret != LDB_SUCCESS) {
3778                 return ret;
3779         }
3780
3781         /* If this change contained linked attributes in the body
3782          * (rather than in the links section) we need to update
3783          * backlinks in linked_attributes */
3784         ret = ldb_request_add_control(req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
3785         if (ret != LDB_SUCCESS) {
3786                 return ret;
3787         }
3788
3789         ar->controls = req->controls;
3790         req->controls = ctrls;
3791
3792         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3793
3794         /* save away the linked attributes for the end of the
3795            transaction */
3796         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3797                 struct la_entry *la_entry;
3798
3799                 if (replmd_private->la_ctx == NULL) {
3800                         replmd_private->la_ctx = talloc_new(replmd_private);
3801                 }
3802                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3803                 if (la_entry == NULL) {
3804                         ldb_oom(ldb);
3805                         return LDB_ERR_OPERATIONS_ERROR;
3806                 }
3807                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3808                 if (la_entry->la == NULL) {
3809                         talloc_free(la_entry);
3810                         ldb_oom(ldb);
3811                         return LDB_ERR_OPERATIONS_ERROR;
3812                 }
3813                 *la_entry->la = ar->objs->linked_attributes[i];
3814
3815                 /* we need to steal the non-scalars so they stay
3816                    around until the end of the transaction */
3817                 talloc_steal(la_entry->la, la_entry->la->identifier);
3818                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3819
3820                 DLIST_ADD(replmd_private->la_list, la_entry);
3821         }
3822
3823         return replmd_replicated_apply_next(ar);
3824 }
3825
3826 /*
3827   process one linked attribute structure
3828  */
3829 static int replmd_process_linked_attribute(struct ldb_module *module,
3830                                            struct la_entry *la_entry,
3831                                            struct ldb_request *parent)
3832 {
3833         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3834         struct ldb_context *ldb = ldb_module_get_ctx(module);
3835         struct ldb_message *msg;
3836         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3837         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
3838         int ret;
3839         const struct dsdb_attribute *attr;
3840         struct dsdb_dn *dsdb_dn;
3841         uint64_t seq_num = 0;
3842         struct ldb_message_element *old_el;
3843         WERROR status;
3844         time_t t = time(NULL);
3845         struct ldb_result *res;
3846         const char *attrs[2];
3847         struct parsed_dn *pdn_list, *pdn;
3848         struct GUID guid = GUID_zero();
3849         NTSTATUS ntstatus;
3850         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3851         const struct GUID *our_invocation_id;
3852
3853 /*
3854 linked_attributes[0]:
3855      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3856         identifier               : *
3857             identifier: struct drsuapi_DsReplicaObjectIdentifier
3858                 __ndr_size               : 0x0000003a (58)
3859                 __ndr_size_sid           : 0x00000000 (0)
3860                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3861                 sid                      : S-0-0
3862                 __ndr_size_dn            : 0x00000000 (0)
3863                 dn                       : ''
3864         attid                    : DRSUAPI_ATTID_member (0x1F)
3865         value: struct drsuapi_DsAttributeValue
3866             __ndr_size               : 0x0000007e (126)
3867             blob                     : *
3868                 blob                     : DATA_BLOB length=126
3869         flags                    : 0x00000001 (1)
3870                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3871         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3872         meta_data: struct drsuapi_DsReplicaMetaData
3873             version                  : 0x00000015 (21)
3874             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3875             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3876             originating_usn          : 0x000000000001e19c (123292)
3877
3878 (for cases where the link is to a normal DN)
3879      &target: struct drsuapi_DsReplicaObjectIdentifier3
3880         __ndr_size               : 0x0000007e (126)
3881         __ndr_size_sid           : 0x0000001c (28)
3882         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3883         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3884         __ndr_size_dn            : 0x00000022 (34)
3885         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3886  */
3887
3888         /* find the attribute being modified */
3889         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3890         if (attr == NULL) {
3891                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3892                 talloc_free(tmp_ctx);
3893                 return LDB_ERR_OPERATIONS_ERROR;
3894         }
3895
3896         attrs[0] = attr->lDAPDisplayName;
3897         attrs[1] = NULL;
3898
3899         /* get the existing message from the db for the object with
3900            this GUID, returning attribute being modified. We will then
3901            use this msg as the basis for a modify call */
3902         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3903                                  DSDB_FLAG_NEXT_MODULE |
3904                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3905                                  DSDB_SEARCH_SHOW_RECYCLED |
3906                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3907                                  DSDB_SEARCH_REVEAL_INTERNALS,
3908                                  parent,
3909                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3910         if (ret != LDB_SUCCESS) {
3911                 talloc_free(tmp_ctx);
3912                 return ret;
3913         }
3914         if (res->count != 1) {
3915                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3916                                        GUID_string(tmp_ctx, &la->identifier->guid));
3917                 talloc_free(tmp_ctx);
3918                 return LDB_ERR_NO_SUCH_OBJECT;
3919         }
3920         msg = res->msgs[0];
3921
3922         if (msg->num_elements == 0) {
3923                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3924                 if (ret != LDB_SUCCESS) {
3925                         ldb_module_oom(module);
3926                         talloc_free(tmp_ctx);
3927                         return LDB_ERR_OPERATIONS_ERROR;
3928                 }
3929         } else {
3930                 old_el = &msg->elements[0];
3931                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3932         }
3933
3934         /* parse the existing links */
3935         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid, parent);
3936         if (ret != LDB_SUCCESS) {
3937                 talloc_free(tmp_ctx);
3938                 return ret;
3939         }
3940
3941         /* get our invocationId */
3942         our_invocation_id = samdb_ntds_invocation_id(ldb);
3943         if (!our_invocation_id) {
3944                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3945                 talloc_free(tmp_ctx);
3946                 return LDB_ERR_OPERATIONS_ERROR;
3947         }
3948
3949         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
3950         if (ret != LDB_SUCCESS) {
3951                 talloc_free(tmp_ctx);
3952                 return ret;
3953         }
3954
3955         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3956         if (!W_ERROR_IS_OK(status)) {
3957                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3958                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3959                 return LDB_ERR_OPERATIONS_ERROR;
3960         }
3961
3962         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3963         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3964                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3965                                        old_el->name,
3966                                        ldb_dn_get_linearized(dsdb_dn->dn),
3967                                        ldb_dn_get_linearized(msg->dn));
3968                 return LDB_ERR_OPERATIONS_ERROR;
3969         }
3970
3971         /* re-resolve the DN by GUID, as the DRS server may give us an
3972            old DN value */
3973         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn, parent);
3974         if (ret != LDB_SUCCESS) {
3975                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s",
3976                          GUID_string(tmp_ctx, &guid),
3977                          ldb_dn_get_linearized(dsdb_dn->dn)));
3978         }
3979
3980         /* see if this link already exists */
3981         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3982         if (pdn != NULL) {
3983                 /* see if this update is newer than what we have already */
3984                 struct GUID invocation_id = GUID_zero();
3985                 uint32_t version = 0;
3986                 uint32_t originating_usn = 0;
3987                 NTTIME change_time = 0;
3988                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3989
3990                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3991                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3992                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &originating_usn, "RMD_ORIGINATING_USN");
3993                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3994
3995                 if (!replmd_update_is_newer(&invocation_id,
3996                                             &la->meta_data.originating_invocation_id,
3997                                             version,
3998                                             la->meta_data.version,
3999                                             change_time,
4000                                             la->meta_data.originating_change_time)) {
4001                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
4002                                  old_el->name, ldb_dn_get_linearized(msg->dn),
4003                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
4004                         talloc_free(tmp_ctx);
4005                         return LDB_SUCCESS;
4006                 }
4007
4008                 /* get a seq_num for this change */
4009                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
4010                 if (ret != LDB_SUCCESS) {
4011                         talloc_free(tmp_ctx);
4012                         return ret;
4013                 }
4014
4015                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
4016                         /* remove the existing backlink */
4017                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
4018                         if (ret != LDB_SUCCESS) {
4019                                 talloc_free(tmp_ctx);
4020                                 return ret;
4021                         }
4022                 }
4023
4024                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
4025                                            &la->meta_data.originating_invocation_id,
4026                                            la->meta_data.originating_usn, seq_num,
4027                                            la->meta_data.originating_change_time,
4028                                            la->meta_data.version,
4029                                            !active);
4030                 if (ret != LDB_SUCCESS) {
4031                         talloc_free(tmp_ctx);
4032                         return ret;
4033                 }
4034
4035                 if (active) {
4036                         /* add the new backlink */
4037                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
4038                         if (ret != LDB_SUCCESS) {
4039                                 talloc_free(tmp_ctx);
4040                                 return ret;
4041                         }
4042                 }
4043         } else {
4044                 /* get a seq_num for this change */
4045                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
4046                 if (ret != LDB_SUCCESS) {
4047                         talloc_free(tmp_ctx);
4048                         return ret;
4049                 }
4050
4051                 old_el->values = talloc_realloc(msg->elements, old_el->values,
4052                                                 struct ldb_val, old_el->num_values+1);
4053                 if (!old_el->values) {
4054                         ldb_module_oom(module);
4055                         return LDB_ERR_OPERATIONS_ERROR;
4056                 }
4057                 old_el->num_values++;
4058
4059                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
4060                                           &la->meta_data.originating_invocation_id,
4061                                           la->meta_data.originating_usn, seq_num,
4062                                           la->meta_data.originating_change_time,
4063                                           la->meta_data.version,
4064                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
4065                 if (ret != LDB_SUCCESS) {
4066                         talloc_free(tmp_ctx);
4067                         return ret;
4068                 }
4069
4070                 if (active) {
4071                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
4072                                                   true, attr, false);
4073                         if (ret != LDB_SUCCESS) {
4074                                 talloc_free(tmp_ctx);
4075                                 return ret;
4076                         }
4077                 }
4078         }
4079
4080         /* we only change whenChanged and uSNChanged if the seq_num
4081            has changed */
4082         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
4083                 talloc_free(tmp_ctx);
4084                 return ldb_operr(ldb);
4085         }
4086
4087         if (add_uint64_element(ldb, msg, "uSNChanged",
4088                                seq_num) != LDB_SUCCESS) {
4089                 talloc_free(tmp_ctx);
4090                 return ldb_operr(ldb);
4091         }
4092
4093         old_el = ldb_msg_find_element(msg, attr->lDAPDisplayName);
4094         if (old_el == NULL) {
4095                 talloc_free(tmp_ctx);
4096                 return ldb_operr(ldb);
4097         }
4098
4099         ret = dsdb_check_single_valued_link(attr, old_el);
4100         if (ret != LDB_SUCCESS) {
4101                 talloc_free(tmp_ctx);
4102                 return ret;
4103         }
4104
4105         old_el->flags |= LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK;
4106
4107         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE, parent);
4108         if (ret != LDB_SUCCESS) {
4109                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
4110                           ldb_errstring(ldb),
4111                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
4112                 talloc_free(tmp_ctx);
4113                 return ret;
4114         }
4115
4116         talloc_free(tmp_ctx);
4117
4118         return ret;
4119 }
4120
4121 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
4122 {
4123         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
4124                 return replmd_extended_replicated_objects(module, req);
4125         }
4126
4127         return ldb_next_request(module, req);
4128 }
4129
4130
4131 /*
4132   we hook into the transaction operations to allow us to
4133   perform the linked attribute updates at the end of the whole
4134   transaction. This allows a forward linked attribute to be created
4135   before the object is created. During a vampire, w2k8 sends us linked
4136   attributes before the objects they are part of.
4137  */
4138 static int replmd_start_transaction(struct ldb_module *module)
4139 {
4140         /* create our private structure for this transaction */
4141         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
4142                                                                 struct replmd_private);
4143         replmd_txn_cleanup(replmd_private);
4144
4145         /* free any leftover mod_usn records from cancelled
4146            transactions */
4147         while (replmd_private->ncs) {
4148                 struct nc_entry *e = replmd_private->ncs;
4149                 DLIST_REMOVE(replmd_private->ncs, e);
4150                 talloc_free(e);
4151         }
4152
4153         return ldb_next_start_trans(module);
4154 }
4155
4156 /*
4157   on prepare commit we loop over our queued la_context structures and
4158   apply each of them
4159  */
4160 static int replmd_prepare_commit(struct ldb_module *module)
4161 {
4162         struct replmd_private *replmd_private =
4163                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4164         struct la_entry *la, *prev;
4165         struct la_backlink *bl;
4166         int ret;
4167
4168         /* walk the list backwards, to do the first entry first, as we
4169          * added the entries with DLIST_ADD() which puts them at the
4170          * start of the list */
4171         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
4172                 prev = DLIST_PREV(la);
4173                 DLIST_REMOVE(replmd_private->la_list, la);
4174                 ret = replmd_process_linked_attribute(module, la, NULL);
4175                 if (ret != LDB_SUCCESS) {
4176                         replmd_txn_cleanup(replmd_private);
4177                         return ret;
4178                 }
4179         }
4180
4181         /* process our backlink list, creating and deleting backlinks
4182            as necessary */
4183         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
4184                 ret = replmd_process_backlink(module, bl, NULL);
4185                 if (ret != LDB_SUCCESS) {
4186                         replmd_txn_cleanup(replmd_private);
4187                         return ret;
4188                 }
4189         }
4190
4191         replmd_txn_cleanup(replmd_private);
4192
4193         /* possibly change @REPLCHANGED */
4194         ret = replmd_notify_store(module, NULL);
4195         if (ret != LDB_SUCCESS) {
4196                 return ret;
4197         }
4198
4199         return ldb_next_prepare_commit(module);
4200 }
4201
4202 static int replmd_del_transaction(struct ldb_module *module)
4203 {
4204         struct replmd_private *replmd_private =
4205                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4206         replmd_txn_cleanup(replmd_private);
4207
4208         return ldb_next_del_trans(module);
4209 }
4210
4211
4212 static const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
4213         .name          = "repl_meta_data",
4214         .init_context      = replmd_init,
4215         .add               = replmd_add,
4216         .modify            = replmd_modify,
4217         .rename            = replmd_rename,
4218         .del               = replmd_delete,
4219         .extended          = replmd_extended,
4220         .start_transaction = replmd_start_transaction,
4221         .prepare_commit    = replmd_prepare_commit,
4222         .del_transaction   = replmd_del_transaction,
4223 };
4224
4225 int ldb_repl_meta_data_module_init(const char *version)
4226 {
4227         LDB_MODULE_CHECK_VERSION(version);
4228         return ldb_register_module(&ldb_repl_meta_data_module_ops);
4229 }