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
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  *  Name: ldb
  25  *
  26  *  Component: ldb repl_meta_data module
  27  *
  28  *  Description: - add a unique objectGUID onto every new record,
  29  *               - handle whenCreated, whenChanged timestamps
  30  *               - handle uSNCreated, uSNChanged numbers
  31  *               - handle replPropertyMetaData attribute
  32  *
  33  *  Author: Simo Sorce
  34  *  Author: Stefan Metzmacher
  35  */
  36
  37 #include "includes.h"
  38 #include "ldb_module.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "dsdb/common/proto.h"
  41 #include "../libds/common/flags.h"
  42 #include "librpc/gen_ndr/ndr_misc.h"
  43 #include "librpc/gen_ndr/ndr_drsuapi.h"
  44 #include "librpc/gen_ndr/ndr_drsblobs.h"
  45 #include "param/param.h"
  46 #include "libcli/security/dom_sid.h"
  47 #include "lib/util/dlinklist.h"
  48 #include "dsdb/samdb/ldb_modules/util.h"
  49 #include "lib/util/binsearch.h"
  50 #include "libcli/security/security.h"
  51
  52 #define W2K3_LINKED_ATTRIBUTES 1
  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 = 3, /* activated on creating as well*/
  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_UPDATE},
 106                 {"classSchema", REPL_URGENT_ON_UPDATE},
 107                 {"secret", REPL_URGENT_ON_UPDATE},
 108                 {"rIDManager", 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         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)
 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);
 214         if (ret != LDB_SUCCESS) {
 215                 ldb_asprintf_errstring(ldb, "Failed to find target DN for linked attribute with GUID %s\n",
 216                                        GUID_string(bl, &bl->target_guid));
 217                 talloc_free(tmp_ctx);
 218                 return ret;
 219         }
 220
 221         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
 222         if (ret != LDB_SUCCESS) {
 223                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 224                                        GUID_string(bl, &bl->forward_guid));
 225                 talloc_free(tmp_ctx);
 226                 return ret;
 227         }
 228
 229         msg = ldb_msg_new(tmp_ctx);
 230         if (msg == NULL) {
 231                 ldb_module_oom(module);
 232                 talloc_free(tmp_ctx);
 233                 return LDB_ERR_OPERATIONS_ERROR;
 234         }
 235
 236         /* construct a ldb_message for adding/deleting the backlink */
 237         msg->dn = target_dn;
 238         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 239         if (!dn_string) {
 240                 ldb_module_oom(module);
 241                 talloc_free(tmp_ctx);
 242                 return LDB_ERR_OPERATIONS_ERROR;
 243         }
 244         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 245         if (ret != LDB_SUCCESS) {
 246                 talloc_free(tmp_ctx);
 247                 return ret;
 248         }
 249         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 250
 251         ret = dsdb_module_modify(module, msg, 0);
 252         if (ret != LDB_SUCCESS) {
 253                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 254                                        bl->active?"add":"remove",
 255                                        ldb_dn_get_linearized(source_dn),
 256                                        ldb_dn_get_linearized(target_dn),
 257                                        ldb_errstring(ldb));
 258                 talloc_free(tmp_ctx);
 259                 return ret;
 260         }
 261         talloc_free(tmp_ctx);
 262         return ret;
 263 }
 264
 265 /*
 266   add a backlink to the list of backlinks to add/delete in the prepare
 267   commit
 268  */
 269 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 270                                struct GUID *forward_guid, struct GUID *target_guid,
 271                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 272 {
 273         const struct dsdb_attribute *target_attr;
 274         struct la_backlink *bl;
 275         struct replmd_private *replmd_private =
 276                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 277
 278         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 279         if (!target_attr) {
 280                 /*
 281                  * windows 2003 has a broken schema where the
 282                  * definition of msDS-IsDomainFor is missing (which is
 283                  * supposed to be the backlink of the
 284                  * msDS-HasDomainNCs attribute
 285                  */
 286                 return LDB_SUCCESS;
 287         }
 288
 289         /* see if its already in the list */
 290         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 291                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 292                     GUID_equal(target_guid, &bl->target_guid) &&
 293                     (target_attr->lDAPDisplayName == bl->attr_name ||
 294                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 295                         break;
 296                 }
 297         }
 298
 299         if (bl) {
 300                 /* we found an existing one */
 301                 if (bl->active == active) {
 302                         return LDB_SUCCESS;
 303                 }
 304                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 305                 talloc_free(bl);
 306                 return LDB_SUCCESS;
 307         }
 308
 309         if (replmd_private->bl_ctx == NULL) {
 310                 replmd_private->bl_ctx = talloc_new(replmd_private);
 311                 if (replmd_private->bl_ctx == NULL) {
 312                         ldb_module_oom(module);
 313                         return LDB_ERR_OPERATIONS_ERROR;
 314                 }
 315         }
 316
 317         /* its a new one */
 318         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 319         if (bl == NULL) {
 320                 ldb_module_oom(module);
 321                 return LDB_ERR_OPERATIONS_ERROR;
 322         }
 323
 324         bl->attr_name = target_attr->lDAPDisplayName;
 325         bl->forward_guid = *forward_guid;
 326         bl->target_guid = *target_guid;
 327         bl->active = active;
 328
 329         /* the caller may ask for this backlink to be processed
 330            immediately */
 331         if (immediate) {
 332                 int ret = replmd_process_backlink(module, bl);
 333                 talloc_free(bl);
 334                 return ret;
 335         }
 336
 337         DLIST_ADD(replmd_private->la_backlinks, bl);
 338
 339         return LDB_SUCCESS;
 340 }
 341
 342
 343 /*
 344  * Callback for most write operations in this module:
 345  *
 346  * notify the repl task that a object has changed. The notifies are
 347  * gathered up in the replmd_private structure then written to the
 348  * @REPLCHANGED object in each partition during the prepare_commit
 349  */
 350 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 351 {
 352         int ret;
 353         struct replmd_replicated_request *ac =
 354                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 355         struct replmd_private *replmd_private =
 356                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 357         struct nc_entry *modified_partition;
 358         struct ldb_control *partition_ctrl;
 359         const struct dsdb_control_current_partition *partition;
 360
 361         struct ldb_control **controls;
 362
 363         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 364
 365         /* Remove the 'partition' control from what we pass up the chain */
 366         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 367
 368         if (ares->error != LDB_SUCCESS) {
 369                 return ldb_module_done(ac->req, controls,
 370                                         ares->response, ares->error);
 371         }
 372
 373         if (ares->type != LDB_REPLY_DONE) {
 374                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 375                 return ldb_module_done(ac->req, NULL,
 376                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 377         }
 378
 379         if (!partition_ctrl) {
 380                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 381                 return ldb_module_done(ac->req, NULL,
 382                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 383         }
 384
 385         partition = talloc_get_type_abort(partition_ctrl->data,
 386                                     struct dsdb_control_current_partition);
 387
 388         if (ac->seq_num > 0) {
 389                 for (modified_partition = replmd_private->ncs; modified_partition;
 390                      modified_partition = modified_partition->next) {
 391                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 392                                 break;
 393                         }
 394                 }
 395
 396                 if (modified_partition == NULL) {
 397                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 398                         if (!modified_partition) {
 399                                 ldb_oom(ldb_module_get_ctx(ac->module));
 400                                 return ldb_module_done(ac->req, NULL,
 401                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 402                         }
 403                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 404                         if (!modified_partition->dn) {
 405                                 ldb_oom(ldb_module_get_ctx(ac->module));
 406                                 return ldb_module_done(ac->req, NULL,
 407                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 408                         }
 409                         DLIST_ADD(replmd_private->ncs, modified_partition);
 410                 }
 411
 412                 if (ac->seq_num > modified_partition->mod_usn) {
 413                         modified_partition->mod_usn = ac->seq_num;
 414                         if (ac->is_urgent) {
 415                                 modified_partition->mod_usn_urgent = ac->seq_num;
 416                         }
 417                 }
 418         }
 419
 420         if (ac->apply_mode) {
 421                 talloc_free(ares);
 422                 ac->index_current++;
 423
 424                 ret = replmd_replicated_apply_next(ac);
 425                 if (ret != LDB_SUCCESS) {
 426                         return ldb_module_done(ac->req, NULL, NULL, ret);
 427                 }
 428                 return ret;
 429         } else {
 430                 /* free the partition control container here, for the
 431                  * common path.  Other cases will have it cleaned up
 432                  * eventually with the ares */
 433                 talloc_free(partition_ctrl);
 434                 return ldb_module_done(ac->req,
 435                                        controls_except_specified(controls, ares, partition_ctrl),
 436                                        ares->response, LDB_SUCCESS);
 437         }
 438 }
 439
 440
 441 /*
 442  * update a @REPLCHANGED record in each partition if there have been
 443  * any writes of replicated data in the partition
 444  */
 445 static int replmd_notify_store(struct ldb_module *module)
 446 {
 447         struct replmd_private *replmd_private =
 448                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 449         struct ldb_context *ldb = ldb_module_get_ctx(module);
 450
 451         while (replmd_private->ncs) {
 452                 int ret;
 453                 struct nc_entry *modified_partition = replmd_private->ncs;
 454
 455                 ret = dsdb_save_partition_usn(ldb, modified_partition->dn,
 456                                                 modified_partition->mod_usn,
 457                                                 modified_partition->mod_usn_urgent);
 458                 if (ret != LDB_SUCCESS) {
 459                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 460                                  ldb_dn_get_linearized(modified_partition->dn)));
 461                         return ret;
 462                 }
 463                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 464                 talloc_free(modified_partition);
 465         }
 466
 467         return LDB_SUCCESS;
 468 }
 469
 470
 471 /*
 472   created a replmd_replicated_request context
 473  */
 474 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 475                                                          struct ldb_request *req)
 476 {
 477         struct ldb_context *ldb;
 478         struct replmd_replicated_request *ac;
 479
 480         ldb = ldb_module_get_ctx(module);
 481
 482         ac = talloc_zero(req, struct replmd_replicated_request);
 483         if (ac == NULL) {
 484                 ldb_oom(ldb);
 485                 return NULL;
 486         }
 487
 488         ac->module = module;
 489         ac->req = req;
 490
 491         ac->schema = dsdb_get_schema(ldb);
 492         if (!ac->schema) {
 493                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 494                               "replmd_modify: no dsdb_schema loaded");
 495                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 496                 return NULL;
 497         }
 498
 499         return ac;
 500 }
 501
 502 /*
 503   add a time element to a record
 504 */
 505 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 506 {
 507         struct ldb_message_element *el;
 508         char *s;
 509
 510         if (ldb_msg_find_element(msg, attr) != NULL) {
 511                 return LDB_SUCCESS;
 512         }
 513
 514         s = ldb_timestring(msg, t);
 515         if (s == NULL) {
 516                 return LDB_ERR_OPERATIONS_ERROR;
 517         }
 518
 519         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 520                 return LDB_ERR_OPERATIONS_ERROR;
 521         }
 522
 523         el = ldb_msg_find_element(msg, attr);
 524         /* always set as replace. This works because on add ops, the flag
 525            is ignored */
 526         el->flags = LDB_FLAG_MOD_REPLACE;
 527
 528         return LDB_SUCCESS;
 529 }
 530
 531 /*
 532   add a uint64_t element to a record
 533 */
 534 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 535 {
 536         struct ldb_message_element *el;
 537
 538         if (ldb_msg_find_element(msg, attr) != NULL) {
 539                 return LDB_SUCCESS;
 540         }
 541
 542         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 543                 return LDB_ERR_OPERATIONS_ERROR;
 544         }
 545
 546         el = ldb_msg_find_element(msg, attr);
 547         /* always set as replace. This works because on add ops, the flag
 548            is ignored */
 549         el->flags = LDB_FLAG_MOD_REPLACE;
 550
 551         return LDB_SUCCESS;
 552 }
 553
 554 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 555                                                    const struct replPropertyMetaData1 *m2,
 556                                                    const uint32_t *rdn_attid)
 557 {
 558         if (m1->attid == m2->attid) {
 559                 return 0;
 560         }
 561
 562         /*
 563          * the rdn attribute should be at the end!
 564          * so we need to return a value greater than zero
 565          * which means m1 is greater than m2
 566          */
 567         if (m1->attid == *rdn_attid) {
 568                 return 1;
 569         }
 570
 571         /*
 572          * the rdn attribute should be at the end!
 573          * so we need to return a value less than zero
 574          * which means m2 is greater than m1
 575          */
 576         if (m2->attid == *rdn_attid) {
 577                 return -1;
 578         }
 579
 580         return m1->attid > m2->attid ? 1 : -1;
 581 }
 582
 583 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 584                                                 const struct dsdb_schema *schema,
 585                                                 struct ldb_dn *dn)
 586 {
 587         const char *rdn_name;
 588         const struct dsdb_attribute *rdn_sa;
 589
 590         rdn_name = ldb_dn_get_rdn_name(dn);
 591         if (!rdn_name) {
 592                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 593                 return LDB_ERR_OPERATIONS_ERROR;
 594         }
 595
 596         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 597         if (rdn_sa == NULL) {
 598                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 599                 return LDB_ERR_OPERATIONS_ERROR;
 600         }
 601
 602         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 603                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 604
 605         ldb_qsort(ctr1->array, ctr1->count, sizeof(struct replPropertyMetaData1),
 606                   discard_const_p(void, &rdn_sa->attributeID_id),
 607                   (ldb_qsort_cmp_fn_t)replmd_replPropertyMetaData1_attid_sort);
 608
 609         return LDB_SUCCESS;
 610 }
 611
 612 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 613                                                  const struct ldb_message_element *e2,
 614                                                  const struct dsdb_schema *schema)
 615 {
 616         const struct dsdb_attribute *a1;
 617         const struct dsdb_attribute *a2;
 618
 619         /*
 620          * TODO: make this faster by caching the dsdb_attribute pointer
 621          *       on the ldb_messag_element
 622          */
 623
 624         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 625         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 626
 627         /*
 628          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 629          *       in the schema
 630          */
 631         if (!a1 || !a2) {
 632                 return strcasecmp(e1->name, e2->name);
 633         }
 634         if (a1->attributeID_id == a2->attributeID_id) {
 635                 return 0;
 636         }
 637         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 638 }
 639
 640 static void replmd_ldb_message_sort(struct ldb_message *msg,
 641                                     const struct dsdb_schema *schema)
 642 {
 643         ldb_qsort(msg->elements, msg->num_elements, sizeof(struct ldb_message_element),
 644                   discard_const_p(void, schema), (ldb_qsort_cmp_fn_t)replmd_ldb_message_element_attid_sort);
 645 }
 646
 647 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 648                                const struct GUID *invocation_id, uint64_t seq_num,
 649                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 650
 651
 652 /*
 653   fix up linked attributes in replmd_add.
 654   This involves setting up the right meta-data in extended DN
 655   components, and creating backlinks to the object
 656  */
 657 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 658                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 659                              struct GUID *guid, const struct dsdb_attribute *sa)
 660 {
 661         int i;
 662         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 663         struct ldb_context *ldb = ldb_module_get_ctx(module);
 664         struct dsdb_schema *schema = dsdb_get_schema(ldb);
 665         NTTIME now;
 666
 667         unix_to_nt_time(&now, t);
 668
 669         for (i=0; i<el->num_values; i++) {
 670                 struct ldb_val *v = &el->values[i];
 671                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 672                 struct GUID target_guid;
 673                 NTSTATUS status;
 674                 int ret;
 675
 676                 /* note that the DN already has the extended
 677                    components from the extended_dn_store module */
 678                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 679                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 680                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid);
 681                         if (ret != LDB_SUCCESS) {
 682                                 talloc_free(tmp_ctx);
 683                                 return ret;
 684                         }
 685                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 686                         if (ret != LDB_SUCCESS) {
 687                                 talloc_free(tmp_ctx);
 688                                 return ret;
 689                         }
 690                 }
 691
 692                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 693                                           seq_num, seq_num, now, 0, false);
 694                 if (ret != LDB_SUCCESS) {
 695                         talloc_free(tmp_ctx);
 696                         return ret;
 697                 }
 698
 699                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 700                 if (ret != LDB_SUCCESS) {
 701                         talloc_free(tmp_ctx);
 702                         return ret;
 703                 }
 704         }
 705
 706         talloc_free(tmp_ctx);
 707         return LDB_SUCCESS;
 708 }
 709
 710
 711 /*
 712   intercept add requests
 713  */
 714 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 715 {
 716         struct ldb_context *ldb;
 717         struct ldb_control *control;
 718         struct replmd_replicated_request *ac;
 719         enum ndr_err_code ndr_err;
 720         struct ldb_request *down_req;
 721         struct ldb_message *msg;
 722         const DATA_BLOB *guid_blob;
 723         struct GUID guid;
 724         struct replPropertyMetaDataBlob nmd;
 725         struct ldb_val nmd_value;
 726         const struct GUID *our_invocation_id;
 727         time_t t = time(NULL);
 728         NTTIME now;
 729         char *time_str;
 730         int ret;
 731         uint32_t i, ni=0;
 732         bool allow_add_guid = false;
 733         bool remove_current_guid = false;
 734         bool is_urgent = false;
 735         struct ldb_message_element *objectclass_el;
 736
 737         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 738         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 739         if (control) {
 740                 allow_add_guid = true;
 741         }
 742
 743         /* do not manipulate our control entries */
 744         if (ldb_dn_is_special(req->op.add.message->dn)) {
 745                 return ldb_next_request(module, req);
 746         }
 747
 748         ldb = ldb_module_get_ctx(module);
 749
 750         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 751
 752         ac = replmd_ctx_init(module, req);
 753         if (!ac) {
 754                 return LDB_ERR_OPERATIONS_ERROR;
 755         }
 756
 757         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 758         if ( guid_blob != NULL ) {
 759                 if( !allow_add_guid ) {
 760                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 761                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 762                         talloc_free(ac);
 763                         return LDB_ERR_UNWILLING_TO_PERFORM;
 764                 } else {
 765                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 766                         if ( !NT_STATUS_IS_OK(status)) {
 767                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 768                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 769                                 talloc_free(ac);
 770                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 771                         }
 772                         /* we remove this attribute as it can be a string and will not be treated
 773                         correctly and then we will readd it latter on in the good format*/
 774                         remove_current_guid = true;
 775                 }
 776         } else {
 777                 /* a new GUID */
 778                 guid = GUID_random();
 779         }
 780
 781         /* Get a sequence number from the backend */
 782         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 783         if (ret != LDB_SUCCESS) {
 784                 talloc_free(ac);
 785                 return ret;
 786         }
 787
 788         /* get our invocationId */
 789         our_invocation_id = samdb_ntds_invocation_id(ldb);
 790         if (!our_invocation_id) {
 791                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 792                               "replmd_add: unable to find invocationId\n");
 793                 talloc_free(ac);
 794                 return LDB_ERR_OPERATIONS_ERROR;
 795         }
 796
 797         /* we have to copy the message as the caller might have it as a const */
 798         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 799         if (msg == NULL) {
 800                 ldb_oom(ldb);
 801                 talloc_free(ac);
 802                 return LDB_ERR_OPERATIONS_ERROR;
 803         }
 804
 805         /* generated times */
 806         unix_to_nt_time(&now, t);
 807         time_str = ldb_timestring(msg, t);
 808         if (!time_str) {
 809                 ldb_oom(ldb);
 810                 talloc_free(ac);
 811                 return LDB_ERR_OPERATIONS_ERROR;
 812         }
 813         if (remove_current_guid) {
 814                 ldb_msg_remove_attr(msg,"objectGUID");
 815         }
 816
 817         /*
 818          * remove autogenerated attributes
 819          */
 820         ldb_msg_remove_attr(msg, "whenCreated");
 821         ldb_msg_remove_attr(msg, "whenChanged");
 822         ldb_msg_remove_attr(msg, "uSNCreated");
 823         ldb_msg_remove_attr(msg, "uSNChanged");
 824         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 825
 826         /*
 827          * readd replicated attributes
 828          */
 829         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 830         if (ret != LDB_SUCCESS) {
 831                 ldb_oom(ldb);
 832                 talloc_free(ac);
 833                 return ret;
 834         }
 835
 836         /* build the replication meta_data */
 837         ZERO_STRUCT(nmd);
 838         nmd.version             = 1;
 839         nmd.ctr.ctr1.count      = msg->num_elements;
 840         nmd.ctr.ctr1.array      = talloc_array(msg,
 841                                                struct replPropertyMetaData1,
 842                                                nmd.ctr.ctr1.count);
 843         if (!nmd.ctr.ctr1.array) {
 844                 ldb_oom(ldb);
 845                 talloc_free(ac);
 846                 return LDB_ERR_OPERATIONS_ERROR;
 847         }
 848
 849         for (i=0; i < msg->num_elements; i++) {
 850                 struct ldb_message_element *e = &msg->elements[i];
 851                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 852                 const struct dsdb_attribute *sa;
 853
 854                 if (e->name[0] == '@') continue;
 855
 856                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 857                 if (!sa) {
 858                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 859                                       "replmd_add: attribute '%s' not defined in schema\n",
 860                                       e->name);
 861                         talloc_free(ac);
 862                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 863                 }
 864
 865                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 866                         /* if the attribute is not replicated (0x00000001)
 867                          * or constructed (0x00000004) it has no metadata
 868                          */
 869                         continue;
 870                 }
 871
 872 #if W2K3_LINKED_ATTRIBUTES
 873                 if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 874                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 875                         if (ret != LDB_SUCCESS) {
 876                                 talloc_free(ac);
 877                                 return ret;
 878                         }
 879                         /* linked attributes are not stored in
 880                            replPropertyMetaData in FL above w2k */
 881                         continue;
 882                 }
 883 #endif
 884
 885                 m->attid                        = sa->attributeID_id;
 886                 m->version                      = 1;
 887                 m->originating_change_time      = now;
 888                 m->originating_invocation_id    = *our_invocation_id;
 889                 m->originating_usn              = ac->seq_num;
 890                 m->local_usn                    = ac->seq_num;
 891                 ni++;
 892         }
 893
 894         /* fix meta data count */
 895         nmd.ctr.ctr1.count = ni;
 896
 897         /*
 898          * sort meta data array, and move the rdn attribute entry to the end
 899          */
 900         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 901         if (ret != LDB_SUCCESS) {
 902                 talloc_free(ac);
 903                 return ret;
 904         }
 905
 906         /* generated NDR encoded values */
 907         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 908                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 909                                        &nmd,
 910                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 911         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 912                 ldb_oom(ldb);
 913                 talloc_free(ac);
 914                 return LDB_ERR_OPERATIONS_ERROR;
 915         }
 916
 917         /*
 918          * add the autogenerated values
 919          */
 920         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 921         if (ret != LDB_SUCCESS) {
 922                 ldb_oom(ldb);
 923                 talloc_free(ac);
 924                 return ret;
 925         }
 926         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 927         if (ret != LDB_SUCCESS) {
 928                 ldb_oom(ldb);
 929                 talloc_free(ac);
 930                 return ret;
 931         }
 932         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 933         if (ret != LDB_SUCCESS) {
 934                 ldb_oom(ldb);
 935                 talloc_free(ac);
 936                 return ret;
 937         }
 938         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 939         if (ret != LDB_SUCCESS) {
 940                 ldb_oom(ldb);
 941                 talloc_free(ac);
 942                 return ret;
 943         }
 944         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 945         if (ret != LDB_SUCCESS) {
 946                 ldb_oom(ldb);
 947                 talloc_free(ac);
 948                 return ret;
 949         }
 950
 951         /*
 952          * sort the attributes by attid before storing the object
 953          */
 954         replmd_ldb_message_sort(msg, ac->schema);
 955
 956         objectclass_el = ldb_msg_find_element(msg, "objectClass");
 957         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
 958                                                         REPL_URGENT_ON_CREATE);
 959
 960         ac->is_urgent = is_urgent;
 961         ret = ldb_build_add_req(&down_req, ldb, ac,
 962                                 msg,
 963                                 req->controls,
 964                                 ac, replmd_op_callback,
 965                                 req);
 966
 967         if (ret != LDB_SUCCESS) {
 968                 talloc_free(ac);
 969                 return ret;
 970         }
 971
 972         /* mark the control done */
 973         if (control) {
 974                 control->critical = 0;
 975         }
 976
 977         /* go on with the call chain */
 978         return ldb_next_request(module, down_req);
 979 }
 980
 981
 982 /*
 983  * update the replPropertyMetaData for one element
 984  */
 985 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 986                                       struct ldb_message *msg,
 987                                       struct ldb_message_element *el,
 988                                       struct replPropertyMetaDataBlob *omd,
 989                                       const struct dsdb_schema *schema,
 990                                       uint64_t *seq_num,
 991                                       const struct GUID *our_invocation_id,
 992                                       NTTIME now)
 993 {
 994         int i;
 995         const struct dsdb_attribute *a;
 996         struct replPropertyMetaData1 *md1;
 997
 998         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
 999         if (a == NULL) {
1000                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1001                          el->name));
1002                 return LDB_ERR_OPERATIONS_ERROR;
1003         }
1004
1005         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1006                 return LDB_SUCCESS;
1007         }
1008
1009         for (i=0; i<omd->ctr.ctr1.count; i++) {
1010                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1011         }
1012
1013 #if W2K3_LINKED_ATTRIBUTES
1014         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1015                 /* linked attributes are not stored in
1016                    replPropertyMetaData in FL above w2k, but we do
1017                    raise the seqnum for the object  */
1018                 if (*seq_num == 0 &&
1019                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1020                         return LDB_ERR_OPERATIONS_ERROR;
1021                 }
1022                 return LDB_SUCCESS;
1023         }
1024 #endif
1025
1026         if (i == omd->ctr.ctr1.count) {
1027                 /* we need to add a new one */
1028                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1029                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1030                 if (omd->ctr.ctr1.array == NULL) {
1031                         ldb_oom(ldb);
1032                         return LDB_ERR_OPERATIONS_ERROR;
1033                 }
1034                 omd->ctr.ctr1.count++;
1035                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1036         }
1037
1038         /* Get a new sequence number from the backend. We only do this
1039          * if we have a change that requires a new
1040          * replPropertyMetaData element
1041          */
1042         if (*seq_num == 0) {
1043                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1044                 if (ret != LDB_SUCCESS) {
1045                         return LDB_ERR_OPERATIONS_ERROR;
1046                 }
1047         }
1048
1049         md1 = &omd->ctr.ctr1.array[i];
1050         md1->version++;
1051         md1->attid                     = a->attributeID_id;
1052         md1->originating_change_time   = now;
1053         md1->originating_invocation_id = *our_invocation_id;
1054         md1->originating_usn           = *seq_num;
1055         md1->local_usn                 = *seq_num;
1056
1057         return LDB_SUCCESS;
1058 }
1059
1060 /*
1061  * update the replPropertyMetaData object each time we modify an
1062  * object. This is needed for DRS replication, as the merge on the
1063  * client is based on this object
1064  */
1065 static int replmd_update_rpmd(struct ldb_module *module,
1066                               const struct dsdb_schema *schema,
1067                               struct ldb_message *msg, uint64_t *seq_num,
1068                               time_t t,
1069                               bool *is_urgent)
1070 {
1071         const struct ldb_val *omd_value;
1072         enum ndr_err_code ndr_err;
1073         struct replPropertyMetaDataBlob omd;
1074         int i;
1075         NTTIME now;
1076         const struct GUID *our_invocation_id;
1077         int ret;
1078         const char *attrs[] = { "replPropertyMetaData" , "objectClass", NULL };
1079         struct ldb_result *res;
1080         struct ldb_context *ldb;
1081         struct ldb_message_element *objectclass_el;
1082
1083         ldb = ldb_module_get_ctx(module);
1084
1085         our_invocation_id = samdb_ntds_invocation_id(ldb);
1086         if (!our_invocation_id) {
1087                 /* this happens during an initial vampire while
1088                    updating the schema */
1089                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1090                 return LDB_SUCCESS;
1091         }
1092
1093         unix_to_nt_time(&now, t);
1094
1095         /* search for the existing replPropertyMetaDataBlob */
1096         ret = dsdb_search_dn_with_deleted(ldb, msg, &res, msg->dn, attrs);
1097         if (ret != LDB_SUCCESS || res->count != 1) {
1098                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1099                          ldb_dn_get_linearized(msg->dn)));
1100                 return LDB_ERR_OPERATIONS_ERROR;
1101         }
1102
1103         objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1104         if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1105                                                         REPL_URGENT_ON_UPDATE)) {
1106                 *is_urgent = true;
1107         }
1108
1109         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1110         if (!omd_value) {
1111                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1112                          ldb_dn_get_linearized(msg->dn)));
1113                 return LDB_ERR_OPERATIONS_ERROR;
1114         }
1115
1116         ndr_err = ndr_pull_struct_blob(omd_value, msg,
1117                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
1118                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1119         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1120                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1121                          ldb_dn_get_linearized(msg->dn)));
1122                 return LDB_ERR_OPERATIONS_ERROR;
1123         }
1124
1125         if (omd.version != 1) {
1126                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1127                          omd.version, ldb_dn_get_linearized(msg->dn)));
1128                 return LDB_ERR_OPERATIONS_ERROR;
1129         }
1130
1131         for (i=0; i<msg->num_elements; i++) {
1132                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], &omd, schema, seq_num,
1133                                                  our_invocation_id, now);
1134                 if (ret != LDB_SUCCESS) {
1135                         return ret;
1136                 }
1137
1138                 if (is_urgent && !*is_urgent) {
1139                         *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1140                 }
1141
1142         }
1143
1144         /*
1145          * replmd_update_rpmd_element has done an update if the
1146          * seq_num is set
1147          */
1148         if (*seq_num != 0) {
1149                 struct ldb_val *md_value;
1150                 struct ldb_message_element *el;
1151
1152                 md_value = talloc(msg, struct ldb_val);
1153                 if (md_value == NULL) {
1154                         ldb_oom(ldb);
1155                         return LDB_ERR_OPERATIONS_ERROR;
1156                 }
1157
1158                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1159                 if (ret != LDB_SUCCESS) {
1160                         return ret;
1161                 }
1162
1163                 ndr_err = ndr_push_struct_blob(md_value, msg,
1164                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1165                                                &omd,
1166                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1167                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1168                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1169                                  ldb_dn_get_linearized(msg->dn)));
1170                         return LDB_ERR_OPERATIONS_ERROR;
1171                 }
1172
1173                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1174                 if (ret != LDB_SUCCESS) {
1175                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1176                                  ldb_dn_get_linearized(msg->dn)));
1177                         return ret;
1178                 }
1179
1180                 el->num_values = 1;
1181                 el->values = md_value;
1182         }
1183
1184         return LDB_SUCCESS;
1185 }
1186
1187 struct parsed_dn {
1188         struct dsdb_dn *dsdb_dn;
1189         struct GUID *guid;
1190         struct ldb_val *v;
1191 };
1192
1193 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1194 {
1195         return GUID_compare(pdn1->guid, pdn2->guid);
1196 }
1197
1198 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1199 {
1200         struct parsed_dn *ret;
1201         if (dn && GUID_all_zero(guid)) {
1202                 /* when updating a link using DRS, we sometimes get a
1203                    NULL GUID. We then need to try and match by DN */
1204                 int i;
1205                 for (i=0; i<count; i++) {
1206                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1207                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1208                                 return &pdn[i];
1209                         }
1210                 }
1211                 return NULL;
1212         }
1213         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1214         return ret;
1215 }
1216
1217 /*
1218   get a series of message element values as an array of DNs and GUIDs
1219   the result is sorted by GUID
1220  */
1221 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1222                           struct ldb_message_element *el, struct parsed_dn **pdn,
1223                           const char *ldap_oid)
1224 {
1225         int i;
1226         struct ldb_context *ldb = ldb_module_get_ctx(module);
1227
1228         if (el == NULL) {
1229                 *pdn = NULL;
1230                 return LDB_SUCCESS;
1231         }
1232
1233         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1234         if (!*pdn) {
1235                 ldb_module_oom(module);
1236                 return LDB_ERR_OPERATIONS_ERROR;
1237         }
1238
1239         for (i=0; i<el->num_values; i++) {
1240                 struct ldb_val *v = &el->values[i];
1241                 NTSTATUS status;
1242                 struct ldb_dn *dn;
1243                 struct parsed_dn *p;
1244
1245                 p = &(*pdn)[i];
1246
1247                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1248                 if (p->dsdb_dn == NULL) {
1249                         return LDB_ERR_INVALID_DN_SYNTAX;
1250                 }
1251
1252                 dn = p->dsdb_dn->dn;
1253
1254                 p->guid = talloc(*pdn, struct GUID);
1255                 if (p->guid == NULL) {
1256                         ldb_module_oom(module);
1257                         return LDB_ERR_OPERATIONS_ERROR;
1258                 }
1259
1260                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1261                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1262                         /* we got a DN without a GUID - go find the GUID */
1263                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1264                         if (ret != LDB_SUCCESS) {
1265                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1266                                                        ldb_dn_get_linearized(dn));
1267                                 return ret;
1268                         }
1269                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1270                         if (ret != LDB_SUCCESS) {
1271                                 return ret;
1272                         }
1273                 } else if (!NT_STATUS_IS_OK(status)) {
1274                         return LDB_ERR_OPERATIONS_ERROR;
1275                 }
1276
1277                 /* keep a pointer to the original ldb_val */
1278                 p->v = v;
1279         }
1280
1281         qsort(*pdn, el->num_values, sizeof((*pdn)[0]), (comparison_fn_t)parsed_dn_compare);
1282
1283         return LDB_SUCCESS;
1284 }
1285
1286 /*
1287   build a new extended DN, including all meta data fields
1288
1289   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1290   RMD_ADDTIME         = originating_add_time
1291   RMD_INVOCID         = originating_invocation_id
1292   RMD_CHANGETIME      = originating_change_time
1293   RMD_ORIGINATING_USN = originating_usn
1294   RMD_LOCAL_USN       = local_usn
1295   RMD_VERSION         = version
1296  */
1297 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1298                                const struct GUID *invocation_id, uint64_t seq_num,
1299                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1300 {
1301         struct ldb_dn *dn = dsdb_dn->dn;
1302         const char *tstring, *usn_string, *flags_string;
1303         struct ldb_val tval;
1304         struct ldb_val iid;
1305         struct ldb_val usnv, local_usnv;
1306         struct ldb_val vers, flagsv;
1307         NTSTATUS status;
1308         int ret;
1309         const char *dnstring;
1310         char *vstring;
1311         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1312
1313         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1314         if (!tstring) {
1315                 return LDB_ERR_OPERATIONS_ERROR;
1316         }
1317         tval = data_blob_string_const(tstring);
1318
1319         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1320         if (!usn_string) {
1321                 return LDB_ERR_OPERATIONS_ERROR;
1322         }
1323         usnv = data_blob_string_const(usn_string);
1324
1325         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1326         if (!usn_string) {
1327                 return LDB_ERR_OPERATIONS_ERROR;
1328         }
1329         local_usnv = data_blob_string_const(usn_string);
1330
1331         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1332         if (!vstring) {
1333                 return LDB_ERR_OPERATIONS_ERROR;
1334         }
1335         vers = data_blob_string_const(vstring);
1336
1337         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1338         if (!NT_STATUS_IS_OK(status)) {
1339                 return LDB_ERR_OPERATIONS_ERROR;
1340         }
1341
1342         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1343         if (!flags_string) {
1344                 return LDB_ERR_OPERATIONS_ERROR;
1345         }
1346         flagsv = data_blob_string_const(flags_string);
1347
1348         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1349         if (ret != LDB_SUCCESS) return ret;
1350         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1351         if (ret != LDB_SUCCESS) return ret;
1352         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1353         if (ret != LDB_SUCCESS) return ret;
1354         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1355         if (ret != LDB_SUCCESS) return ret;
1356         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1357         if (ret != LDB_SUCCESS) return ret;
1358         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1359         if (ret != LDB_SUCCESS) return ret;
1360         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1361         if (ret != LDB_SUCCESS) return ret;
1362
1363         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1364         if (dnstring == NULL) {
1365                 return LDB_ERR_OPERATIONS_ERROR;
1366         }
1367         *v = data_blob_string_const(dnstring);
1368
1369         return LDB_SUCCESS;
1370 }
1371
1372 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1373                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1374                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1375                                 uint32_t version, bool deleted);
1376
1377 /*
1378   check if any links need upgrading from w2k format
1379  */
1380 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, const struct GUID *invocation_id)
1381 {
1382         int i;
1383         for (i=0; i<count; i++) {
1384                 NTSTATUS status;
1385                 uint32_t version;
1386                 int ret;
1387
1388                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1389                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1390                         continue;
1391                 }
1392
1393                 /* it's an old one that needs upgrading */
1394                 ret = replmd_update_la_val(dns, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1395                                            1, 1, 0, 0, false);
1396                 if (ret != LDB_SUCCESS) {
1397                         return ret;
1398                 }
1399         }
1400         return LDB_SUCCESS;
1401 }
1402
1403 /*
1404   update an extended DN, including all meta data fields
1405
1406   see replmd_build_la_val for value names
1407  */
1408 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1409                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1410                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1411                                 uint32_t version, bool deleted)
1412 {
1413         struct ldb_dn *dn = dsdb_dn->dn;
1414         const char *tstring, *usn_string, *flags_string;
1415         struct ldb_val tval;
1416         struct ldb_val iid;
1417         struct ldb_val usnv, local_usnv;
1418         struct ldb_val vers, flagsv;
1419         const struct ldb_val *old_addtime;
1420         uint32_t old_version;
1421         NTSTATUS status;
1422         int ret;
1423         const char *dnstring;
1424         char *vstring;
1425         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1426
1427         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1428         if (!tstring) {
1429                 return LDB_ERR_OPERATIONS_ERROR;
1430         }
1431         tval = data_blob_string_const(tstring);
1432
1433         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1434         if (!usn_string) {
1435                 return LDB_ERR_OPERATIONS_ERROR;
1436         }
1437         usnv = data_blob_string_const(usn_string);
1438
1439         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1440         if (!usn_string) {
1441                 return LDB_ERR_OPERATIONS_ERROR;
1442         }
1443         local_usnv = data_blob_string_const(usn_string);
1444
1445         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1446         if (!NT_STATUS_IS_OK(status)) {
1447                 return LDB_ERR_OPERATIONS_ERROR;
1448         }
1449
1450         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1451         if (!flags_string) {
1452                 return LDB_ERR_OPERATIONS_ERROR;
1453         }
1454         flagsv = data_blob_string_const(flags_string);
1455
1456         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1457         if (ret != LDB_SUCCESS) return ret;
1458
1459         /* get the ADDTIME from the original */
1460         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1461         if (old_addtime == NULL) {
1462                 old_addtime = &tval;
1463         }
1464         if (dsdb_dn != old_dsdb_dn) {
1465                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1466                 if (ret != LDB_SUCCESS) return ret;
1467         }
1468
1469         /* use our invocation id */
1470         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1471         if (ret != LDB_SUCCESS) return ret;
1472
1473         /* changetime is the current time */
1474         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1475         if (ret != LDB_SUCCESS) return ret;
1476
1477         /* update the USN */
1478         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1479         if (ret != LDB_SUCCESS) return ret;
1480
1481         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1482         if (ret != LDB_SUCCESS) return ret;
1483
1484         /* increase the version by 1 */
1485         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1486         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1487                 version = old_version+1;
1488         }
1489         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1490         vers = data_blob_string_const(vstring);
1491         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1492         if (ret != LDB_SUCCESS) return ret;
1493
1494         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1495         if (dnstring == NULL) {
1496                 return LDB_ERR_OPERATIONS_ERROR;
1497         }
1498         *v = data_blob_string_const(dnstring);
1499
1500         return LDB_SUCCESS;
1501 }
1502
1503 /*
1504   handle adding a linked attribute
1505  */
1506 static int replmd_modify_la_add(struct ldb_module *module,
1507                                 struct dsdb_schema *schema,
1508                                 struct ldb_message *msg,
1509                                 struct ldb_message_element *el,
1510                                 struct ldb_message_element *old_el,
1511                                 const struct dsdb_attribute *schema_attr,
1512                                 uint64_t seq_num,
1513                                 time_t t,
1514                                 struct GUID *msg_guid)
1515 {
1516         int i;
1517         struct parsed_dn *dns, *old_dns;
1518         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1519         int ret;
1520         struct ldb_val *new_values = NULL;
1521         unsigned int num_new_values = 0;
1522         unsigned old_num_values = old_el?old_el->num_values:0;
1523         const struct GUID *invocation_id;
1524         struct ldb_context *ldb = ldb_module_get_ctx(module);
1525         NTTIME now;
1526
1527         unix_to_nt_time(&now, t);
1528
1529         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1530         if (ret != LDB_SUCCESS) {
1531                 talloc_free(tmp_ctx);
1532                 return ret;
1533         }
1534
1535         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1536         if (ret != LDB_SUCCESS) {
1537                 talloc_free(tmp_ctx);
1538                 return ret;
1539         }
1540
1541         invocation_id = samdb_ntds_invocation_id(ldb);
1542         if (!invocation_id) {
1543                 talloc_free(tmp_ctx);
1544                 return LDB_ERR_OPERATIONS_ERROR;
1545         }
1546
1547         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1548         if (ret != LDB_SUCCESS) {
1549                 talloc_free(tmp_ctx);
1550                 return ret;
1551         }
1552
1553         /* for each new value, see if it exists already with the same GUID */
1554         for (i=0; i<el->num_values; i++) {
1555                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1556                 if (p == NULL) {
1557                         /* this is a new linked attribute value */
1558                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1559                         if (new_values == NULL) {
1560                                 ldb_module_oom(module);
1561                                 talloc_free(tmp_ctx);
1562                                 return LDB_ERR_OPERATIONS_ERROR;
1563                         }
1564                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1565                                                   invocation_id, seq_num, seq_num, now, 0, false);
1566                         if (ret != LDB_SUCCESS) {
1567                                 talloc_free(tmp_ctx);
1568                                 return ret;
1569                         }
1570                         num_new_values++;
1571                 } else {
1572                         /* this is only allowed if the GUID was
1573                            previously deleted. */
1574                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1575
1576                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1577                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1578                                                        el->name, GUID_string(tmp_ctx, p->guid));
1579                                 talloc_free(tmp_ctx);
1580                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1581                         }
1582                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1583                                                    invocation_id, seq_num, seq_num, now, 0, false);
1584                         if (ret != LDB_SUCCESS) {
1585                                 talloc_free(tmp_ctx);
1586                                 return ret;
1587                         }
1588                 }
1589
1590                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1591                 if (ret != LDB_SUCCESS) {
1592                         talloc_free(tmp_ctx);
1593                         return ret;
1594                 }
1595         }
1596
1597         /* add the new ones on to the end of the old values, constructing a new el->values */
1598         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1599                                     struct ldb_val,
1600                                     old_num_values+num_new_values);
1601         if (el->values == NULL) {
1602                 ldb_module_oom(module);
1603                 return LDB_ERR_OPERATIONS_ERROR;
1604         }
1605
1606         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1607         el->num_values = old_num_values + num_new_values;
1608
1609         talloc_steal(msg->elements, el->values);
1610         talloc_steal(el->values, new_values);
1611
1612         talloc_free(tmp_ctx);
1613
1614         /* we now tell the backend to replace all existing values
1615            with the one we have constructed */
1616         el->flags = LDB_FLAG_MOD_REPLACE;
1617
1618         return LDB_SUCCESS;
1619 }
1620
1621
1622 /*
1623   handle deleting all active linked attributes
1624  */
1625 static int replmd_modify_la_delete(struct ldb_module *module,
1626                                    struct dsdb_schema *schema,
1627                                    struct ldb_message *msg,
1628                                    struct ldb_message_element *el,
1629                                    struct ldb_message_element *old_el,
1630                                    const struct dsdb_attribute *schema_attr,
1631                                    uint64_t seq_num,
1632                                    time_t t,
1633                                    struct GUID *msg_guid)
1634 {
1635         int i;
1636         struct parsed_dn *dns, *old_dns;
1637         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1638         int ret;
1639         const struct GUID *invocation_id;
1640         struct ldb_context *ldb = ldb_module_get_ctx(module);
1641         NTTIME now;
1642
1643         unix_to_nt_time(&now, t);
1644
1645         /* check if there is nothing to delete */
1646         if ((!old_el || old_el->num_values == 0) &&
1647             el->num_values == 0) {
1648                 return LDB_SUCCESS;
1649         }
1650
1651         if (!old_el || old_el->num_values == 0) {
1652                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1653         }
1654
1655         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1656         if (ret != LDB_SUCCESS) {
1657                 talloc_free(tmp_ctx);
1658                 return ret;
1659         }
1660
1661         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1662         if (ret != LDB_SUCCESS) {
1663                 talloc_free(tmp_ctx);
1664                 return ret;
1665         }
1666
1667         invocation_id = samdb_ntds_invocation_id(ldb);
1668         if (!invocation_id) {
1669                 return LDB_ERR_OPERATIONS_ERROR;
1670         }
1671
1672         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, invocation_id);
1673         if (ret != LDB_SUCCESS) {
1674                 talloc_free(tmp_ctx);
1675                 return ret;
1676         }
1677
1678         el->values = NULL;
1679
1680         /* see if we are being asked to delete any links that
1681            don't exist or are already deleted */
1682         for (i=0; i<el->num_values; i++) {
1683                 struct parsed_dn *p = &dns[i];
1684                 struct parsed_dn *p2;
1685                 uint32_t rmd_flags;
1686
1687                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1688                 if (!p2) {
1689                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1690                                                el->name, GUID_string(tmp_ctx, p->guid));
1691                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1692                 }
1693                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1694                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1695                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1696                                                el->name, GUID_string(tmp_ctx, p->guid));
1697                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1698                 }
1699         }
1700
1701         /* for each new value, see if it exists already with the same GUID
1702            if it is not already deleted and matches the delete list then delete it
1703         */
1704         for (i=0; i<old_el->num_values; i++) {
1705                 struct parsed_dn *p = &old_dns[i];
1706                 uint32_t rmd_flags;
1707
1708                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1709                         continue;
1710                 }
1711
1712                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1713                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1714
1715                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1716                                            invocation_id, seq_num, seq_num, now, 0, true);
1717                 if (ret != LDB_SUCCESS) {
1718                         talloc_free(tmp_ctx);
1719                         return ret;
1720                 }
1721
1722                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1723                 if (ret != LDB_SUCCESS) {
1724                         talloc_free(tmp_ctx);
1725                         return ret;
1726                 }
1727         }
1728
1729         el->values = talloc_steal(msg->elements, old_el->values);
1730         el->num_values = old_el->num_values;
1731
1732         talloc_free(tmp_ctx);
1733
1734         /* we now tell the backend to replace all existing values
1735            with the one we have constructed */
1736         el->flags = LDB_FLAG_MOD_REPLACE;
1737
1738         return LDB_SUCCESS;
1739 }
1740
1741 /*
1742   handle replacing a linked attribute
1743  */
1744 static int replmd_modify_la_replace(struct ldb_module *module,
1745                                     struct dsdb_schema *schema,
1746                                     struct ldb_message *msg,
1747                                     struct ldb_message_element *el,
1748                                     struct ldb_message_element *old_el,
1749                                     const struct dsdb_attribute *schema_attr,
1750                                     uint64_t seq_num,
1751                                     time_t t,
1752                                     struct GUID *msg_guid)
1753 {
1754         int i;
1755         struct parsed_dn *dns, *old_dns;
1756         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1757         int ret;
1758         const struct GUID *invocation_id;
1759         struct ldb_context *ldb = ldb_module_get_ctx(module);
1760         struct ldb_val *new_values = NULL;
1761         uint32_t num_new_values = 0;
1762         unsigned old_num_values = old_el?old_el->num_values:0;
1763         NTTIME now;
1764
1765         unix_to_nt_time(&now, t);
1766
1767         /* check if there is nothing to replace */
1768         if ((!old_el || old_el->num_values == 0) &&
1769             el->num_values == 0) {
1770                 return LDB_SUCCESS;
1771         }
1772
1773         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1774         if (ret != LDB_SUCCESS) {
1775                 talloc_free(tmp_ctx);
1776                 return ret;
1777         }
1778
1779         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1780         if (ret != LDB_SUCCESS) {
1781                 talloc_free(tmp_ctx);
1782                 return ret;
1783         }
1784
1785         invocation_id = samdb_ntds_invocation_id(ldb);
1786         if (!invocation_id) {
1787                 return LDB_ERR_OPERATIONS_ERROR;
1788         }
1789
1790         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1791         if (ret != LDB_SUCCESS) {
1792                 talloc_free(tmp_ctx);
1793                 return ret;
1794         }
1795
1796         /* mark all the old ones as deleted */
1797         for (i=0; i<old_num_values; i++) {
1798                 struct parsed_dn *old_p = &old_dns[i];
1799                 struct parsed_dn *p;
1800                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1801
1802                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1803
1804                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1805                 if (ret != LDB_SUCCESS) {
1806                         talloc_free(tmp_ctx);
1807                         return ret;
1808                 }
1809
1810                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1811                 if (p) {
1812                         /* we don't delete it if we are re-adding it */
1813                         continue;
1814                 }
1815
1816                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1817                                            invocation_id, seq_num, seq_num, now, 0, true);
1818                 if (ret != LDB_SUCCESS) {
1819                         talloc_free(tmp_ctx);
1820                         return ret;
1821                 }
1822         }
1823
1824         /* for each new value, either update its meta-data, or add it
1825          * to old_el
1826         */
1827         for (i=0; i<el->num_values; i++) {
1828                 struct parsed_dn *p = &dns[i], *old_p;
1829
1830                 if (old_dns &&
1831                     (old_p = parsed_dn_find(old_dns,
1832                                             old_num_values, p->guid, NULL)) != NULL) {
1833                         /* update in place */
1834                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1835                                                    old_p->dsdb_dn, invocation_id,
1836                                                    seq_num, seq_num, now, 0, false);
1837                         if (ret != LDB_SUCCESS) {
1838                                 talloc_free(tmp_ctx);
1839                                 return ret;
1840                         }
1841                 } else {
1842                         /* add a new one */
1843                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1844                                                     num_new_values+1);
1845                         if (new_values == NULL) {
1846                                 ldb_module_oom(module);
1847                                 talloc_free(tmp_ctx);
1848                                 return LDB_ERR_OPERATIONS_ERROR;
1849                         }
1850                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1851                                                   invocation_id, seq_num, seq_num, now, 0, false);
1852                         if (ret != LDB_SUCCESS) {
1853                                 talloc_free(tmp_ctx);
1854                                 return ret;
1855                         }
1856                         num_new_values++;
1857                 }
1858
1859                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1860                 if (ret != LDB_SUCCESS) {
1861                         talloc_free(tmp_ctx);
1862                         return ret;
1863                 }
1864         }
1865
1866         /* add the new values to the end of old_el */
1867         if (num_new_values != 0) {
1868                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1869                                             struct ldb_val, old_num_values+num_new_values);
1870                 if (el->values == NULL) {
1871                         ldb_module_oom(module);
1872                         return LDB_ERR_OPERATIONS_ERROR;
1873                 }
1874                 memcpy(&el->values[old_num_values], &new_values[0],
1875                        sizeof(struct ldb_val)*num_new_values);
1876                 el->num_values = old_num_values + num_new_values;
1877                 talloc_steal(msg->elements, new_values);
1878         } else {
1879                 el->values = old_el->values;
1880                 el->num_values = old_el->num_values;
1881                 talloc_steal(msg->elements, el->values);
1882         }
1883
1884         talloc_free(tmp_ctx);
1885
1886         /* we now tell the backend to replace all existing values
1887            with the one we have constructed */
1888         el->flags = LDB_FLAG_MOD_REPLACE;
1889
1890         return LDB_SUCCESS;
1891 }
1892
1893
1894 /*
1895   handle linked attributes in modify requests
1896  */
1897 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1898                                                struct ldb_message *msg,
1899                                                uint64_t seq_num, time_t t)
1900 {
1901         struct ldb_result *res;
1902         int ret, i;
1903         struct ldb_context *ldb = ldb_module_get_ctx(module);
1904         struct ldb_message *old_msg;
1905         struct dsdb_schema *schema = dsdb_get_schema(ldb);
1906         struct GUID old_guid;
1907
1908         if (seq_num == 0) {
1909                 /* there the replmd_update_rpmd code has already
1910                  * checked and saw that there are no linked
1911                  * attributes */
1912                 return LDB_SUCCESS;
1913         }
1914
1915 #if !W2K3_LINKED_ATTRIBUTES
1916         return LDB_SUCCESS;
1917 #endif
1918
1919         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1920                 /* don't do anything special for linked attributes */
1921                 return LDB_SUCCESS;
1922         }
1923
1924         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1925                                     DSDB_SEARCH_SHOW_DELETED |
1926                                     DSDB_SEARCH_REVEAL_INTERNALS |
1927                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1928         if (ret != LDB_SUCCESS) {
1929                 return ret;
1930         }
1931         old_msg = res->msgs[0];
1932
1933         old_guid = samdb_result_guid(old_msg, "objectGUID");
1934
1935         for (i=0; i<msg->num_elements; i++) {
1936                 struct ldb_message_element *el = &msg->elements[i];
1937                 struct ldb_message_element *old_el, *new_el;
1938                 const struct dsdb_attribute *schema_attr
1939                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1940                 if (!schema_attr) {
1941                         ldb_asprintf_errstring(ldb,
1942                                                "attribute %s is not a valid attribute in schema", el->name);
1943                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
1944                 }
1945                 if (schema_attr->linkID == 0) {
1946                         continue;
1947                 }
1948                 if ((schema_attr->linkID & 1) == 1) {
1949                         /* Odd is for the target.  Illegal to modify */
1950                         ldb_asprintf_errstring(ldb,
1951                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
1952                         return LDB_ERR_UNWILLING_TO_PERFORM;
1953                 }
1954                 old_el = ldb_msg_find_element(old_msg, el->name);
1955                 switch (el->flags & LDB_FLAG_MOD_MASK) {
1956                 case LDB_FLAG_MOD_REPLACE:
1957                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1958                         break;
1959                 case LDB_FLAG_MOD_DELETE:
1960                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1961                         break;
1962                 case LDB_FLAG_MOD_ADD:
1963                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1964                         break;
1965                 default:
1966                         ldb_asprintf_errstring(ldb,
1967                                                "invalid flags 0x%x for %s linked attribute",
1968                                                el->flags, el->name);
1969                         return LDB_ERR_UNWILLING_TO_PERFORM;
1970                 }
1971                 if (ret != LDB_SUCCESS) {
1972                         return ret;
1973                 }
1974                 if (old_el) {
1975                         ldb_msg_remove_attr(old_msg, el->name);
1976                 }
1977                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
1978                 new_el->num_values = el->num_values;
1979                 new_el->values = talloc_steal(msg->elements, el->values);
1980
1981                 /* TODO: this relises a bit too heavily on the exact
1982                    behaviour of ldb_msg_find_element and
1983                    ldb_msg_remove_element */
1984                 old_el = ldb_msg_find_element(msg, el->name);
1985                 if (old_el != el) {
1986                         ldb_msg_remove_element(msg, old_el);
1987                         i--;
1988                 }
1989         }
1990
1991         talloc_free(res);
1992         return ret;
1993 }
1994
1995
1996
1997 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
1998 {
1999         struct ldb_context *ldb;
2000         struct replmd_replicated_request *ac;
2001         struct ldb_request *down_req;
2002         struct ldb_message *msg;
2003         time_t t = time(NULL);
2004         int ret;
2005         bool is_urgent = false;
2006
2007         /* do not manipulate our control entries */
2008         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2009                 return ldb_next_request(module, req);
2010         }
2011
2012         ldb = ldb_module_get_ctx(module);
2013
2014         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2015
2016         ac = replmd_ctx_init(module, req);
2017         if (!ac) {
2018                 return LDB_ERR_OPERATIONS_ERROR;
2019         }
2020
2021         /* we have to copy the message as the caller might have it as a const */
2022         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2023         if (msg == NULL) {
2024                 ldb_oom(ldb);
2025                 talloc_free(ac);
2026                 return LDB_ERR_OPERATIONS_ERROR;
2027         }
2028
2029         ldb_msg_remove_attr(msg, "whenChanged");
2030         ldb_msg_remove_attr(msg, "uSNChanged");
2031
2032         ret = replmd_update_rpmd(module, ac->schema, msg, &ac->seq_num, t, &is_urgent);
2033         if (ret != LDB_SUCCESS) {
2034                 talloc_free(ac);
2035                 return ret;
2036         }
2037
2038         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
2039         if (ret != LDB_SUCCESS) {
2040                 talloc_free(ac);
2041                 return ret;
2042         }
2043
2044         /* TODO:
2045          * - replace the old object with the newly constructed one
2046          */
2047
2048         ac->is_urgent = is_urgent;
2049
2050         ret = ldb_build_mod_req(&down_req, ldb, ac,
2051                                 msg,
2052                                 req->controls,
2053                                 ac, replmd_op_callback,
2054                                 req);
2055         if (ret != LDB_SUCCESS) {
2056                 talloc_free(ac);
2057                 return ret;
2058         }
2059         talloc_steal(down_req, msg);
2060
2061         /* we only change whenChanged and uSNChanged if the seq_num
2062            has changed */
2063         if (ac->seq_num != 0) {
2064                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2065                         talloc_free(ac);
2066                         return ret;
2067                 }
2068
2069                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2070                         talloc_free(ac);
2071                         return ret;
2072                 }
2073         }
2074
2075         /* go on with the call chain */
2076         return ldb_next_request(module, down_req);
2077 }
2078
2079 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2080
2081 /*
2082   handle a rename request
2083
2084   On a rename we need to do an extra ldb_modify which sets the
2085   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2086  */
2087 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2088 {
2089         struct ldb_context *ldb;
2090         struct replmd_replicated_request *ac;
2091         int ret;
2092         struct ldb_request *down_req;
2093
2094         /* do not manipulate our control entries */
2095         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2096                 return ldb_next_request(module, req);
2097         }
2098
2099         ldb = ldb_module_get_ctx(module);
2100
2101         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2102
2103         ac = replmd_ctx_init(module, req);
2104         if (!ac) {
2105                 return LDB_ERR_OPERATIONS_ERROR;
2106         }
2107         ret = ldb_build_rename_req(&down_req, ldb, ac,
2108                                    ac->req->op.rename.olddn,
2109                                    ac->req->op.rename.newdn,
2110                                    ac->req->controls,
2111                                    ac, replmd_rename_callback,
2112                                    ac->req);
2113
2114         if (ret != LDB_SUCCESS) {
2115                 talloc_free(ac);
2116                 return ret;
2117         }
2118
2119         /* go on with the call chain */
2120         return ldb_next_request(module, down_req);
2121 }
2122
2123 /* After the rename is compleated, update the whenchanged etc */
2124 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2125 {
2126         struct ldb_context *ldb;
2127         struct replmd_replicated_request *ac;
2128         struct ldb_request *down_req;
2129         struct ldb_message *msg;
2130         time_t t = time(NULL);
2131         int ret;
2132
2133         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2134         ldb = ldb_module_get_ctx(ac->module);
2135
2136         if (ares->error != LDB_SUCCESS) {
2137                 return ldb_module_done(ac->req, ares->controls,
2138                                         ares->response, ares->error);
2139         }
2140
2141         if (ares->type != LDB_REPLY_DONE) {
2142                 ldb_set_errstring(ldb,
2143                                   "invalid ldb_reply_type in callback");
2144                 talloc_free(ares);
2145                 return ldb_module_done(ac->req, NULL, NULL,
2146                                         LDB_ERR_OPERATIONS_ERROR);
2147         }
2148
2149         /* Get a sequence number from the backend */
2150         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2151         if (ret != LDB_SUCCESS) {
2152                 return ret;
2153         }
2154
2155         /* TODO:
2156          * - replace the old object with the newly constructed one
2157          */
2158
2159         msg = ldb_msg_new(ac);
2160         if (msg == NULL) {
2161                 ldb_oom(ldb);
2162                 return LDB_ERR_OPERATIONS_ERROR;
2163         }
2164
2165         msg->dn = ac->req->op.rename.newdn;
2166
2167         ret = ldb_build_mod_req(&down_req, ldb, ac,
2168                                 msg,
2169                                 req->controls,
2170                                 ac, replmd_op_callback,
2171                                 req);
2172
2173         if (ret != LDB_SUCCESS) {
2174                 talloc_free(ac);
2175                 return ret;
2176         }
2177         talloc_steal(down_req, msg);
2178
2179         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2180                 talloc_free(ac);
2181                 return ret;
2182         }
2183
2184         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2185                 talloc_free(ac);
2186                 return ret;
2187         }
2188
2189         /* go on with the call chain - do the modify after the rename */
2190         return ldb_next_request(ac->module, down_req);
2191 }
2192
2193 /*
2194    remove links from objects that point at this object when an object
2195    is deleted
2196  */
2197 static int replmd_delete_remove_link(struct ldb_module *module,
2198                                      struct dsdb_schema *schema,
2199                                      struct ldb_dn *dn,
2200                                      struct ldb_message_element *el,
2201                                      const struct dsdb_attribute *sa)
2202 {
2203         int i;
2204         TALLOC_CTX *tmp_ctx = talloc_new(module);
2205         struct ldb_context *ldb = ldb_module_get_ctx(module);
2206
2207         for (i=0; i<el->num_values; i++) {
2208                 struct dsdb_dn *dsdb_dn;
2209                 NTSTATUS status;
2210                 int ret;
2211                 struct GUID guid2;
2212                 struct ldb_message *msg;
2213                 const struct dsdb_attribute *target_attr;
2214                 struct ldb_message_element *el2;
2215                 struct ldb_val dn_val;
2216
2217                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2218                         continue;
2219                 }
2220
2221                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2222                 if (!dsdb_dn) {
2223                         talloc_free(tmp_ctx);
2224                         return LDB_ERR_OPERATIONS_ERROR;
2225                 }
2226
2227                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2228                 if (!NT_STATUS_IS_OK(status)) {
2229                         talloc_free(tmp_ctx);
2230                         return LDB_ERR_OPERATIONS_ERROR;
2231                 }
2232
2233                 /* remove the link */
2234                 msg = ldb_msg_new(tmp_ctx);
2235                 if (!msg) {
2236                         ldb_module_oom(module);
2237                         talloc_free(tmp_ctx);
2238                         return LDB_ERR_OPERATIONS_ERROR;
2239                 }
2240
2241
2242                 msg->dn = dsdb_dn->dn;
2243
2244                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2245                 if (target_attr == NULL) {
2246                         continue;
2247                 }
2248
2249                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2250                 if (ret != LDB_SUCCESS) {
2251                         ldb_module_oom(module);
2252                         talloc_free(tmp_ctx);
2253                         return LDB_ERR_OPERATIONS_ERROR;
2254                 }
2255                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2256                 el2->values = &dn_val;
2257                 el2->num_values = 1;
2258
2259                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2260                 if (ret != LDB_SUCCESS) {
2261                         talloc_free(tmp_ctx);
2262                         return ret;
2263                 }
2264         }
2265         talloc_free(tmp_ctx);
2266         return LDB_SUCCESS;
2267 }
2268
2269
2270 /*
2271   handle update of replication meta data for deletion of objects
2272
2273   This also handles the mapping of delete to a rename operation
2274   to allow deletes to be replicated.
2275  */
2276 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2277 {
2278         int ret = LDB_ERR_OTHER;
2279         bool retb;
2280         struct ldb_dn *old_dn, *new_dn;
2281         const char *rdn_name;
2282         const struct ldb_val *rdn_value, *new_rdn_value;
2283         struct GUID guid;
2284         struct ldb_context *ldb = ldb_module_get_ctx(module);
2285         struct dsdb_schema *schema = dsdb_get_schema(ldb);
2286         struct ldb_message *msg, *old_msg;
2287         struct ldb_message_element *el;
2288         TALLOC_CTX *tmp_ctx;
2289         struct ldb_result *res, *parent_res;
2290         const char *preserved_attrs[] = {
2291                 /* yes, this really is a hard coded list. See MS-ADTS
2292                    section 3.1.1.5.5.1.1 */
2293                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2294                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2295                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2296                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2297                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2298                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2299                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2300                 "whenChanged", NULL};
2301         uint32_t el_count = 0;
2302         int i;
2303
2304         if (ldb_dn_is_special(req->op.del.dn)) {
2305                 return ldb_next_request(module, req);
2306         }
2307
2308         tmp_ctx = talloc_new(ldb);
2309
2310         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2311
2312         /* we need the complete msg off disk, so we can work out which
2313            attributes need to be removed */
2314         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2315                                     DSDB_SEARCH_SHOW_DELETED |
2316                                     DSDB_SEARCH_REVEAL_INTERNALS |
2317                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2318         if (ret != LDB_SUCCESS) {
2319                 talloc_free(tmp_ctx);
2320                 return ret;
2321         }
2322         old_msg = res->msgs[0];
2323
2324         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2325                 struct auth_session_info *session_info =
2326                         (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2327                 if (security_session_user_level(session_info) != SECURITY_SYSTEM) {
2328                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2329                                                ldb_dn_get_linearized(old_msg->dn));
2330                         return LDB_ERR_UNWILLING_TO_PERFORM;
2331                 }
2332
2333                 /* it is already deleted - really remove it this time */
2334                 talloc_free(tmp_ctx);
2335                 return ldb_next_request(module, req);
2336         }
2337
2338         /* work out where we will be renaming this object to */
2339         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2340         if (ret != LDB_SUCCESS) {
2341                 /* this is probably an attempted delete on a partition
2342                  * that doesn't allow delete operations, such as the
2343                  * schema partition */
2344                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2345                                        ldb_dn_get_linearized(old_dn));
2346                 talloc_free(tmp_ctx);
2347                 return LDB_ERR_UNWILLING_TO_PERFORM;
2348         }
2349
2350         rdn_name = ldb_dn_get_rdn_name(old_dn);
2351         rdn_value = ldb_dn_get_rdn_val(old_dn);
2352
2353         /* get the objects GUID from the search we just did */
2354         guid = samdb_result_guid(old_msg, "objectGUID");
2355
2356         /* Add a formatted child */
2357         retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2358                                     rdn_name,
2359                                     rdn_value->data,
2360                                     GUID_string(tmp_ctx, &guid));
2361         if (!retb) {
2362                 DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2363                                 ldb_dn_get_linearized(new_dn)));
2364                 talloc_free(tmp_ctx);
2365                 return LDB_ERR_OPERATIONS_ERROR;
2366         }
2367
2368         /*
2369           now we need to modify the object in the following ways:
2370
2371           - add isDeleted=TRUE
2372           - update rDN and name, with new rDN
2373           - remove linked attributes
2374           - remove objectCategory and sAMAccountType
2375           - remove attribs not on the preserved list
2376              - preserved if in above list, or is rDN
2377           - remove all linked attribs from this object
2378           - remove all links from other objects to this object
2379           - add lastKnownParent
2380           - update replPropertyMetaData?
2381
2382           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2383          */
2384
2385         msg = ldb_msg_new(tmp_ctx);
2386         if (msg == NULL) {
2387                 ldb_module_oom(module);
2388                 talloc_free(tmp_ctx);
2389                 return LDB_ERR_OPERATIONS_ERROR;
2390         }
2391
2392         msg->dn = old_dn;
2393
2394         ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2395         if (ret != LDB_SUCCESS) {
2396                 DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2397                 ldb_module_oom(module);
2398                 talloc_free(tmp_ctx);
2399                 return ret;
2400         }
2401         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2402
2403         /* we also mark it as recycled, meaning this object can't be
2404            recovered (we are stripping its attributes) */
2405         if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2406                 ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2407                 if (ret != LDB_SUCCESS) {
2408                         DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2409                         ldb_module_oom(module);
2410                         talloc_free(tmp_ctx);
2411                         return ret;
2412                 }
2413                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2414         }
2415
2416         /* we need the storage form of the parent GUID */
2417         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2418                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2419                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2420                                     DSDB_SEARCH_REVEAL_INTERNALS);
2421         if (ret != LDB_SUCCESS) {
2422                 talloc_free(tmp_ctx);
2423                 return ret;
2424         }
2425
2426         ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2427                                        ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2428         if (ret != LDB_SUCCESS) {
2429                 DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2430                 ldb_module_oom(module);
2431                 talloc_free(tmp_ctx);
2432                 return ret;
2433         }
2434         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2435
2436         /* work out which of the old attributes we will be removing */
2437         for (i=0; i<old_msg->num_elements; i++) {
2438                 const struct dsdb_attribute *sa;
2439                 el = &old_msg->elements[i];
2440                 sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2441                 if (!sa) {
2442                         talloc_free(tmp_ctx);
2443                         return LDB_ERR_OPERATIONS_ERROR;
2444                 }
2445                 if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2446                         /* don't remove the rDN */
2447                         continue;
2448                 }
2449
2450                 if (sa->linkID && sa->linkID & 1) {
2451                         ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2452                         if (ret != LDB_SUCCESS) {
2453                                 talloc_free(tmp_ctx);
2454                                 return LDB_ERR_OPERATIONS_ERROR;
2455                         }
2456                         continue;
2457                 }
2458
2459                 if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2460                         continue;
2461                 }
2462
2463                 ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2464                 if (ret != LDB_SUCCESS) {
2465                         talloc_free(tmp_ctx);
2466                         ldb_module_oom(module);
2467                         return ret;
2468                 }
2469         }
2470
2471         /* work out what the new rdn value is, for updating the
2472            rDN and name fields */
2473         new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2474         ret = ldb_msg_add_value(msg, rdn_name, new_rdn_value, &el);
2475         if (ret != LDB_SUCCESS) {
2476                 talloc_free(tmp_ctx);
2477                 return ret;
2478         }
2479         el->flags = LDB_FLAG_MOD_REPLACE;
2480
2481         el = ldb_msg_find_element(old_msg, "name");
2482         if (el) {
2483                 ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2484                 if (ret != LDB_SUCCESS) {
2485                         talloc_free(tmp_ctx);
2486                         return ret;
2487                 }
2488                 el->flags = LDB_FLAG_MOD_REPLACE;
2489         }
2490
2491         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2492         if (ret != LDB_SUCCESS) {
2493                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2494                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2495                 talloc_free(tmp_ctx);
2496                 return ret;
2497         }
2498
2499         /* now rename onto the new DN */
2500         ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2501         if (ret != LDB_SUCCESS){
2502                 DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2503                          ldb_dn_get_linearized(old_dn),
2504                          ldb_dn_get_linearized(new_dn),
2505                          ldb_errstring(ldb)));
2506                 talloc_free(tmp_ctx);
2507                 return ret;
2508         }
2509
2510         talloc_free(tmp_ctx);
2511
2512         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2513 }
2514
2515
2516
2517 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2518 {
2519         return ret;
2520 }
2521
2522 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2523 {
2524         int ret = LDB_ERR_OTHER;
2525         /* TODO: do some error mapping */
2526         return ret;
2527 }
2528
2529 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2530 {
2531         struct ldb_context *ldb;
2532         struct ldb_request *change_req;
2533         enum ndr_err_code ndr_err;
2534         struct ldb_message *msg;
2535         struct replPropertyMetaDataBlob *md;
2536         struct ldb_val md_value;
2537         uint32_t i;
2538         int ret;
2539
2540         /*
2541          * TODO: check if the parent object exist
2542          */
2543
2544         /*
2545          * TODO: handle the conflict case where an object with the
2546          *       same name exist
2547          */
2548
2549         ldb = ldb_module_get_ctx(ar->module);
2550         msg = ar->objs->objects[ar->index_current].msg;
2551         md = ar->objs->objects[ar->index_current].meta_data;
2552
2553         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2554         if (ret != LDB_SUCCESS) {
2555                 return replmd_replicated_request_error(ar, ret);
2556         }
2557
2558         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2559         if (ret != LDB_SUCCESS) {
2560                 return replmd_replicated_request_error(ar, ret);
2561         }
2562
2563         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2564         if (ret != LDB_SUCCESS) {
2565                 return replmd_replicated_request_error(ar, ret);
2566         }
2567
2568         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2569         if (ret != LDB_SUCCESS) {
2570                 return replmd_replicated_request_error(ar, ret);
2571         }
2572
2573         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2574         if (ret != LDB_SUCCESS) {
2575                 return replmd_replicated_request_error(ar, ret);
2576         }
2577
2578         /* remove any message elements that have zero values */
2579         for (i=0; i<msg->num_elements; i++) {
2580                 struct ldb_message_element *el = &msg->elements[i];
2581
2582                 if (el->num_values == 0) {
2583                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2584                                  el->name));
2585                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2586                         msg->num_elements--;
2587                         i--;
2588                         continue;
2589                 }
2590         }
2591
2592         /*
2593          * the meta data array is already sorted by the caller
2594          */
2595         for (i=0; i < md->ctr.ctr1.count; i++) {
2596                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2597         }
2598         ndr_err = ndr_push_struct_blob(&md_value, msg,
2599                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2600                                        md,
2601                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2602         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2603                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2604                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2605         }
2606         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2607         if (ret != LDB_SUCCESS) {
2608                 return replmd_replicated_request_error(ar, ret);
2609         }
2610
2611         replmd_ldb_message_sort(msg, ar->schema);
2612
2613         if (DEBUGLVL(4)) {
2614                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2615                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2616                 talloc_free(s);
2617         }
2618
2619         ret = ldb_build_add_req(&change_req,
2620                                 ldb,
2621                                 ar,
2622                                 msg,
2623                                 ar->controls,
2624                                 ar,
2625                                 replmd_op_callback,
2626                                 ar->req);
2627         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2628
2629         return ldb_next_request(ar->module, change_req);
2630 }
2631
2632 /*
2633    return true if an update is newer than an existing entry
2634    see section 5.11 of MS-ADTS
2635 */
2636 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2637                                    const struct GUID *update_invocation_id,
2638                                    uint32_t current_version,
2639                                    uint32_t update_version,
2640                                    NTTIME current_change_time,
2641                                    NTTIME update_change_time)
2642 {
2643         if (update_version != current_version) {
2644                 return update_version > current_version;
2645         }
2646         if (update_change_time > current_change_time) {
2647                 return true;
2648         }
2649         if (update_change_time == current_change_time) {
2650                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2651         }
2652         return false;
2653 }
2654
2655 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2656                                                   struct replPropertyMetaData1 *new_m)
2657 {
2658         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2659                                       &new_m->originating_invocation_id,
2660                                       cur_m->version,
2661                                       new_m->version,
2662                                       cur_m->originating_change_time,
2663                                       new_m->originating_change_time);
2664 }
2665
2666 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2667 {
2668         struct ldb_context *ldb;
2669         struct ldb_request *change_req;
2670         enum ndr_err_code ndr_err;
2671         struct ldb_message *msg;
2672         struct replPropertyMetaDataBlob *rmd;
2673         struct replPropertyMetaDataBlob omd;
2674         const struct ldb_val *omd_value;
2675         struct replPropertyMetaDataBlob nmd;
2676         struct ldb_val nmd_value;
2677         uint32_t i,j,ni=0;
2678         uint32_t removed_attrs = 0;
2679         int ret;
2680
2681         ldb = ldb_module_get_ctx(ar->module);
2682         msg = ar->objs->objects[ar->index_current].msg;
2683         rmd = ar->objs->objects[ar->index_current].meta_data;
2684         ZERO_STRUCT(omd);
2685         omd.version = 1;
2686
2687         /*
2688          * TODO: check repl data is correct after a rename
2689          */
2690         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2691                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2692                           ldb_dn_get_linearized(ar->search_msg->dn),
2693                           ldb_dn_get_linearized(msg->dn));
2694                 if (dsdb_module_rename(ar->module,
2695                                        ar->search_msg->dn, msg->dn,
2696                                        DSDB_FLAG_OWN_MODULE) != LDB_SUCCESS) {
2697                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2698                                   ldb_dn_get_linearized(ar->search_msg->dn),
2699                                   ldb_dn_get_linearized(msg->dn),
2700                                   ldb_errstring(ldb));
2701                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2702                 }
2703         }
2704
2705         /* find existing meta data */
2706         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2707         if (omd_value) {
2708                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
2709                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
2710                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2711                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2712                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2713                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2714                 }
2715
2716                 if (omd.version != 1) {
2717                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2718                 }
2719         }
2720
2721         ZERO_STRUCT(nmd);
2722         nmd.version = 1;
2723         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2724         nmd.ctr.ctr1.array = talloc_array(ar,
2725                                           struct replPropertyMetaData1,
2726                                           nmd.ctr.ctr1.count);
2727         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2728
2729         /* first copy the old meta data */
2730         for (i=0; i < omd.ctr.ctr1.count; i++) {
2731                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2732                 ni++;
2733         }
2734
2735         /* now merge in the new meta data */
2736         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2737                 bool found = false;
2738
2739                 for (j=0; j < ni; j++) {
2740                         bool cmp;
2741
2742                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2743                                 continue;
2744                         }
2745
2746                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2747                                                                     &rmd->ctr.ctr1.array[i]);
2748                         if (cmp) {
2749                                 /* replace the entry */
2750                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2751                                 found = true;
2752                                 break;
2753                         }
2754
2755                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
2756                                 DEBUG(1,("Discarding older DRS attribute update to %s on %s from %s\n",
2757                                          msg->elements[i-removed_attrs].name,
2758                                          ldb_dn_get_linearized(msg->dn),
2759                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2760                         }
2761
2762                         /* we don't want to apply this change so remove the attribute */
2763                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2764                         removed_attrs++;
2765
2766                         found = true;
2767                         break;
2768                 }
2769
2770                 if (found) continue;
2771
2772                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2773                 ni++;
2774         }
2775
2776         /*
2777          * finally correct the size of the meta_data array
2778          */
2779         nmd.ctr.ctr1.count = ni;
2780
2781         /*
2782          * the rdn attribute (the alias for the name attribute),
2783          * 'cn' for most objects is the last entry in the meta data array
2784          * we have stored
2785          *
2786          * sort the new meta data array
2787          */
2788         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2789         if (ret != LDB_SUCCESS) {
2790                 return ret;
2791         }
2792
2793         /*
2794          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2795          */
2796         if (msg->num_elements == 0) {
2797                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2798                           ar->index_current);
2799
2800                 ar->index_current++;
2801                 return replmd_replicated_apply_next(ar);
2802         }
2803
2804         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2805                   ar->index_current, msg->num_elements);
2806
2807         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2808         if (ret != LDB_SUCCESS) {
2809                 return replmd_replicated_request_error(ar, ret);
2810         }
2811
2812         for (i=0; i<ni; i++) {
2813                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2814         }
2815
2816         /* create the meta data value */
2817         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
2818                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2819                                        &nmd,
2820                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2821         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2822                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2823                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2824         }
2825
2826         /*
2827          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2828          * and replPopertyMetaData attributes
2829          */
2830         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2831         if (ret != LDB_SUCCESS) {
2832                 return replmd_replicated_request_error(ar, ret);
2833         }
2834         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2835         if (ret != LDB_SUCCESS) {
2836                 return replmd_replicated_request_error(ar, ret);
2837         }
2838         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2839         if (ret != LDB_SUCCESS) {
2840                 return replmd_replicated_request_error(ar, ret);
2841         }
2842
2843         replmd_ldb_message_sort(msg, ar->schema);
2844
2845         /* we want to replace the old values */
2846         for (i=0; i < msg->num_elements; i++) {
2847                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
2848         }
2849
2850         if (DEBUGLVL(4)) {
2851                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
2852                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
2853                 talloc_free(s);
2854         }
2855
2856         ret = ldb_build_mod_req(&change_req,
2857                                 ldb,
2858                                 ar,
2859                                 msg,
2860                                 ar->controls,
2861                                 ar,
2862                                 replmd_op_callback,
2863                                 ar->req);
2864         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2865
2866         return ldb_next_request(ar->module, change_req);
2867 }
2868
2869 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
2870                                                    struct ldb_reply *ares)
2871 {
2872         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2873                                                struct replmd_replicated_request);
2874         int ret;
2875
2876         if (!ares) {
2877                 return ldb_module_done(ar->req, NULL, NULL,
2878                                         LDB_ERR_OPERATIONS_ERROR);
2879         }
2880         if (ares->error != LDB_SUCCESS &&
2881             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
2882                 return ldb_module_done(ar->req, ares->controls,
2883                                         ares->response, ares->error);
2884         }
2885
2886         switch (ares->type) {
2887         case LDB_REPLY_ENTRY:
2888                 ar->search_msg = talloc_steal(ar, ares->message);
2889                 break;
2890
2891         case LDB_REPLY_REFERRAL:
2892                 /* we ignore referrals */
2893                 break;
2894
2895         case LDB_REPLY_DONE:
2896                 if (ar->search_msg != NULL) {
2897                         ret = replmd_replicated_apply_merge(ar);
2898                 } else {
2899                         ret = replmd_replicated_apply_add(ar);
2900                 }
2901                 if (ret != LDB_SUCCESS) {
2902                         return ldb_module_done(ar->req, NULL, NULL, ret);
2903                 }
2904         }
2905
2906         talloc_free(ares);
2907         return LDB_SUCCESS;
2908 }
2909
2910 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
2911
2912 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
2913 {
2914         struct ldb_context *ldb;
2915         int ret;
2916         char *tmp_str;
2917         char *filter;
2918         struct ldb_request *search_req;
2919         struct ldb_search_options_control *options;
2920
2921         if (ar->index_current >= ar->objs->num_objects) {
2922                 /* done with it, go to next stage */
2923                 return replmd_replicated_uptodate_vector(ar);
2924         }
2925
2926         ldb = ldb_module_get_ctx(ar->module);
2927         ar->search_msg = NULL;
2928
2929         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
2930         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2931
2932         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
2933         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2934         talloc_free(tmp_str);
2935
2936         ret = ldb_build_search_req(&search_req,
2937                                    ldb,
2938                                    ar,
2939                                    NULL,
2940                                    LDB_SCOPE_SUBTREE,
2941                                    filter,
2942                                    NULL,
2943                                    NULL,
2944                                    ar,
2945                                    replmd_replicated_apply_search_callback,
2946                                    ar->req);
2947
2948         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
2949         if (ret != LDB_SUCCESS) {
2950                 return ret;
2951         }
2952
2953         /* we need to cope with cross-partition links, so search for
2954            the GUID over all partitions */
2955         options = talloc(search_req, struct ldb_search_options_control);
2956         if (options == NULL) {
2957                 DEBUG(0, (__location__ ": out of memory\n"));
2958                 return LDB_ERR_OPERATIONS_ERROR;
2959         }
2960         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
2961
2962         ret = ldb_request_add_control(search_req,
2963                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
2964                                       true, options);
2965         if (ret != LDB_SUCCESS) {
2966                 return ret;
2967         }
2968
2969         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2970
2971         return ldb_next_request(ar->module, search_req);
2972 }
2973
2974 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
2975                                                       struct ldb_reply *ares)
2976 {
2977         struct ldb_context *ldb;
2978         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2979                                                struct replmd_replicated_request);
2980         ldb = ldb_module_get_ctx(ar->module);
2981
2982         if (!ares) {
2983                 return ldb_module_done(ar->req, NULL, NULL,
2984                                         LDB_ERR_OPERATIONS_ERROR);
2985         }
2986         if (ares->error != LDB_SUCCESS) {
2987                 return ldb_module_done(ar->req, ares->controls,
2988                                         ares->response, ares->error);
2989         }
2990
2991         if (ares->type != LDB_REPLY_DONE) {
2992                 ldb_set_errstring(ldb, "Invalid reply type\n!");
2993                 return ldb_module_done(ar->req, NULL, NULL,
2994                                         LDB_ERR_OPERATIONS_ERROR);
2995         }
2996
2997         talloc_free(ares);
2998
2999         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3000 }
3001
3002 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3003 {
3004         struct ldb_context *ldb;
3005         struct ldb_request *change_req;
3006         enum ndr_err_code ndr_err;
3007         struct ldb_message *msg;
3008         struct replUpToDateVectorBlob ouv;
3009         const struct ldb_val *ouv_value;
3010         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3011         struct replUpToDateVectorBlob nuv;
3012         struct ldb_val nuv_value;
3013         struct ldb_message_element *nuv_el = NULL;
3014         const struct GUID *our_invocation_id;
3015         struct ldb_message_element *orf_el = NULL;
3016         struct repsFromToBlob nrf;
3017         struct ldb_val *nrf_value = NULL;
3018         struct ldb_message_element *nrf_el = NULL;
3019         uint32_t i,j,ni=0;
3020         bool found = false;
3021         time_t t = time(NULL);
3022         NTTIME now;
3023         int ret;
3024
3025         ldb = ldb_module_get_ctx(ar->module);
3026         ruv = ar->objs->uptodateness_vector;
3027         ZERO_STRUCT(ouv);
3028         ouv.version = 2;
3029         ZERO_STRUCT(nuv);
3030         nuv.version = 2;
3031
3032         unix_to_nt_time(&now, t);
3033
3034         /*
3035          * first create the new replUpToDateVector
3036          */
3037         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3038         if (ouv_value) {
3039                 ndr_err = ndr_pull_struct_blob(ouv_value, ar,
3040                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
3041                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3042                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3043                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3044                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3045                 }
3046
3047                 if (ouv.version != 2) {
3048                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3049                 }
3050         }
3051
3052         /*
3053          * the new uptodateness vector will at least
3054          * contain 1 entry, one for the source_dsa
3055          *
3056          * plus optional values from our old vector and the one from the source_dsa
3057          */
3058         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3059         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3060         nuv.ctr.ctr2.cursors = talloc_array(ar,
3061                                             struct drsuapi_DsReplicaCursor2,
3062                                             nuv.ctr.ctr2.count);
3063         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3064
3065         /* first copy the old vector */
3066         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3067                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3068                 ni++;
3069         }
3070
3071         /* get our invocation_id if we have one already attached to the ldb */
3072         our_invocation_id = samdb_ntds_invocation_id(ldb);
3073
3074         /* merge in the source_dsa vector is available */
3075         for (i=0; (ruv && i < ruv->count); i++) {
3076                 found = false;
3077
3078                 if (our_invocation_id &&
3079                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3080                                our_invocation_id)) {
3081                         continue;
3082                 }
3083
3084                 for (j=0; j < ni; j++) {
3085                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3086                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3087                                 continue;
3088                         }
3089
3090                         found = true;
3091
3092                         /*
3093                          * we update only the highest_usn and not the latest_sync_success time,
3094                          * because the last success stands for direct replication
3095                          */
3096                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3097                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3098                         }
3099                         break;
3100                 }
3101
3102                 if (found) continue;
3103
3104                 /* if it's not there yet, add it */
3105                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3106                 ni++;
3107         }
3108
3109         /*
3110          * merge in the current highwatermark for the source_dsa
3111          */
3112         found = false;
3113         for (j=0; j < ni; j++) {
3114                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3115                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3116                         continue;
3117                 }
3118
3119                 found = true;
3120
3121                 /*
3122                  * here we update the highest_usn and last_sync_success time
3123                  * because we're directly replicating from the source_dsa
3124                  *
3125                  * and use the tmp_highest_usn because this is what we have just applied
3126                  * to our ldb
3127                  */
3128                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3129                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3130                 break;
3131         }
3132         if (!found) {
3133                 /*
3134                  * here we update the highest_usn and last_sync_success time
3135                  * because we're directly replicating from the source_dsa
3136                  *
3137                  * and use the tmp_highest_usn because this is what we have just applied
3138                  * to our ldb
3139                  */
3140                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3141                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3142                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3143                 ni++;
3144         }
3145
3146         /*
3147          * finally correct the size of the cursors array
3148          */
3149         nuv.ctr.ctr2.count = ni;
3150
3151         /*
3152          * sort the cursors
3153          */
3154         qsort(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count,
3155               sizeof(struct drsuapi_DsReplicaCursor2),
3156               (comparison_fn_t)drsuapi_DsReplicaCursor2_compare);
3157
3158         /*
3159          * create the change ldb_message
3160          */
3161         msg = ldb_msg_new(ar);
3162         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3163         msg->dn = ar->search_msg->dn;
3164
3165         ndr_err = ndr_push_struct_blob(&nuv_value, msg,
3166                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3167                                        &nuv,
3168                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3169         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3170                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3171                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3172         }
3173         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3174         if (ret != LDB_SUCCESS) {
3175                 return replmd_replicated_request_error(ar, ret);
3176         }
3177         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3178
3179         /*
3180          * now create the new repsFrom value from the given repsFromTo1 structure
3181          */
3182         ZERO_STRUCT(nrf);
3183         nrf.version                                     = 1;
3184         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3185         /* and fix some values... */
3186         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3187         nrf.ctr.ctr1.last_success                       = now;
3188         nrf.ctr.ctr1.last_attempt                       = now;
3189         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3190         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3191
3192         /*
3193          * first see if we already have a repsFrom value for the current source dsa
3194          * if so we'll later replace this value
3195          */
3196         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3197         if (orf_el) {
3198                 for (i=0; i < orf_el->num_values; i++) {
3199                         struct repsFromToBlob *trf;
3200
3201                         trf = talloc(ar, struct repsFromToBlob);
3202                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3203
3204                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
3205                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3206                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3207                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3208                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3209                         }
3210
3211                         if (trf->version != 1) {
3212                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3213                         }
3214
3215                         /*
3216                          * we compare the source dsa objectGUID not the invocation_id
3217                          * because we want only one repsFrom value per source dsa
3218                          * and when the invocation_id of the source dsa has changed we don't need
3219                          * the old repsFrom with the old invocation_id
3220                          */
3221                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3222                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3223                                 talloc_free(trf);
3224                                 continue;
3225                         }
3226
3227                         talloc_free(trf);
3228                         nrf_value = &orf_el->values[i];
3229                         break;
3230                 }
3231
3232                 /*
3233                  * copy over all old values to the new ldb_message
3234                  */
3235                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3236                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3237                 *nrf_el = *orf_el;
3238         }
3239
3240         /*
3241          * if we haven't found an old repsFrom value for the current source dsa
3242          * we'll add a new value
3243          */
3244         if (!nrf_value) {
3245                 struct ldb_val zero_value;
3246                 ZERO_STRUCT(zero_value);
3247                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3248                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3249
3250                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3251         }
3252
3253         /* we now fill the value which is already attached to ldb_message */
3254         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3255                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3256                                        &nrf,
3257                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3258         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3259                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3260                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3261         }
3262
3263         /*
3264          * the ldb_message_element for the attribute, has all the old values and the new one
3265          * so we'll replace the whole attribute with all values
3266          */
3267         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3268
3269         if (DEBUGLVL(4)) {
3270                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3271                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3272                 talloc_free(s);
3273         }
3274
3275         /* prepare the ldb_modify() request */
3276         ret = ldb_build_mod_req(&change_req,
3277                                 ldb,
3278                                 ar,
3279                                 msg,
3280                                 ar->controls,
3281                                 ar,
3282                                 replmd_replicated_uptodate_modify_callback,
3283                                 ar->req);
3284         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3285
3286         return ldb_next_request(ar->module, change_req);
3287 }
3288
3289 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3290                                                       struct ldb_reply *ares)
3291 {
3292         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3293                                                struct replmd_replicated_request);
3294         int ret;
3295
3296         if (!ares) {
3297                 return ldb_module_done(ar->req, NULL, NULL,
3298                                         LDB_ERR_OPERATIONS_ERROR);
3299         }
3300         if (ares->error != LDB_SUCCESS &&
3301             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3302                 return ldb_module_done(ar->req, ares->controls,
3303                                         ares->response, ares->error);
3304         }
3305
3306         switch (ares->type) {
3307         case LDB_REPLY_ENTRY:
3308                 ar->search_msg = talloc_steal(ar, ares->message);
3309                 break;
3310
3311         case LDB_REPLY_REFERRAL:
3312                 /* we ignore referrals */
3313                 break;
3314
3315         case LDB_REPLY_DONE:
3316                 if (ar->search_msg == NULL) {
3317                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3318                 } else {
3319                         ret = replmd_replicated_uptodate_modify(ar);
3320                 }
3321                 if (ret != LDB_SUCCESS) {
3322                         return ldb_module_done(ar->req, NULL, NULL, ret);
3323                 }
3324         }
3325
3326         talloc_free(ares);
3327         return LDB_SUCCESS;
3328 }
3329
3330
3331 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3332 {
3333         struct ldb_context *ldb;
3334         int ret;
3335         static const char *attrs[] = {
3336                 "replUpToDateVector",
3337                 "repsFrom",
3338                 NULL
3339         };
3340         struct ldb_request *search_req;
3341
3342         ldb = ldb_module_get_ctx(ar->module);
3343         ar->search_msg = NULL;
3344
3345         ret = ldb_build_search_req(&search_req,
3346                                    ldb,
3347                                    ar,
3348                                    ar->objs->partition_dn,
3349                                    LDB_SCOPE_BASE,
3350                                    "(objectClass=*)",
3351                                    attrs,
3352                                    NULL,
3353                                    ar,
3354                                    replmd_replicated_uptodate_search_callback,
3355                                    ar->req);
3356         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3357
3358         return ldb_next_request(ar->module, search_req);
3359 }
3360
3361
3362
3363 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3364 {
3365         struct ldb_context *ldb;
3366         struct dsdb_extended_replicated_objects *objs;
3367         struct replmd_replicated_request *ar;
3368         struct ldb_control **ctrls;
3369         int ret, i;
3370         struct replmd_private *replmd_private =
3371                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3372
3373         ldb = ldb_module_get_ctx(module);
3374
3375         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3376
3377         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3378         if (!objs) {
3379                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3380                 return LDB_ERR_PROTOCOL_ERROR;
3381         }
3382
3383         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3384                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3385                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3386                 return LDB_ERR_PROTOCOL_ERROR;
3387         }
3388
3389         ar = replmd_ctx_init(module, req);
3390         if (!ar)
3391                 return LDB_ERR_OPERATIONS_ERROR;
3392
3393         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3394         ar->apply_mode = true;
3395         ar->objs = objs;
3396         ar->schema = dsdb_get_schema(ldb);
3397         if (!ar->schema) {
3398                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3399                 talloc_free(ar);
3400                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3401                 return LDB_ERR_CONSTRAINT_VIOLATION;
3402         }
3403
3404         ctrls = req->controls;
3405
3406         if (req->controls) {
3407                 req->controls = talloc_memdup(ar, req->controls,
3408                                               talloc_get_size(req->controls));
3409                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3410         }
3411
3412         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3413         if (ret != LDB_SUCCESS) {
3414                 return ret;
3415         }
3416
3417         ar->controls = req->controls;
3418         req->controls = ctrls;
3419
3420         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3421
3422         /* save away the linked attributes for the end of the
3423            transaction */
3424         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3425                 struct la_entry *la_entry;
3426
3427                 if (replmd_private->la_ctx == NULL) {
3428                         replmd_private->la_ctx = talloc_new(replmd_private);
3429                 }
3430                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3431                 if (la_entry == NULL) {
3432                         ldb_oom(ldb);
3433                         return LDB_ERR_OPERATIONS_ERROR;
3434                 }
3435                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3436                 if (la_entry->la == NULL) {
3437                         talloc_free(la_entry);
3438                         ldb_oom(ldb);
3439                         return LDB_ERR_OPERATIONS_ERROR;
3440                 }
3441                 *la_entry->la = ar->objs->linked_attributes[i];
3442
3443                 /* we need to steal the non-scalars so they stay
3444                    around until the end of the transaction */
3445                 talloc_steal(la_entry->la, la_entry->la->identifier);
3446                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3447
3448                 DLIST_ADD(replmd_private->la_list, la_entry);
3449         }
3450
3451         return replmd_replicated_apply_next(ar);
3452 }
3453
3454 /*
3455   process one linked attribute structure
3456  */
3457 static int replmd_process_linked_attribute(struct ldb_module *module,
3458                                            struct la_entry *la_entry)
3459 {
3460         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3461         struct ldb_context *ldb = ldb_module_get_ctx(module);
3462         struct dsdb_schema *schema = dsdb_get_schema(ldb);
3463         struct ldb_message *msg;
3464         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3465         int ret;
3466         const struct dsdb_attribute *attr;
3467         struct dsdb_dn *dsdb_dn;
3468         uint64_t seq_num = 0;
3469         struct ldb_message_element *old_el;
3470         WERROR status;
3471         time_t t = time(NULL);
3472         struct ldb_result *res;
3473         const char *attrs[2];
3474         struct parsed_dn *pdn_list, *pdn;
3475         struct GUID guid = GUID_zero();
3476         NTSTATUS ntstatus;
3477         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3478         const struct GUID *our_invocation_id;
3479
3480 /*
3481 linked_attributes[0]:
3482      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3483         identifier               : *
3484             identifier: struct drsuapi_DsReplicaObjectIdentifier
3485                 __ndr_size               : 0x0000003a (58)
3486                 __ndr_size_sid           : 0x00000000 (0)
3487                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3488                 sid                      : S-0-0
3489                 __ndr_size_dn            : 0x00000000 (0)
3490                 dn                       : ''
3491         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3492         value: struct drsuapi_DsAttributeValue
3493             __ndr_size               : 0x0000007e (126)
3494             blob                     : *
3495                 blob                     : DATA_BLOB length=126
3496         flags                    : 0x00000001 (1)
3497                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3498         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3499         meta_data: struct drsuapi_DsReplicaMetaData
3500             version                  : 0x00000015 (21)
3501             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3502             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3503             originating_usn          : 0x000000000001e19c (123292)
3504
3505 (for cases where the link is to a normal DN)
3506      &target: struct drsuapi_DsReplicaObjectIdentifier3
3507         __ndr_size               : 0x0000007e (126)
3508         __ndr_size_sid           : 0x0000001c (28)
3509         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3510         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3511         __ndr_size_dn            : 0x00000022 (34)
3512         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3513  */
3514
3515         /* find the attribute being modified */
3516         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3517         if (attr == NULL) {
3518                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3519                 talloc_free(tmp_ctx);
3520                 return LDB_ERR_OPERATIONS_ERROR;
3521         }
3522
3523         attrs[0] = attr->lDAPDisplayName;
3524         attrs[1] = NULL;
3525
3526         /* get the existing message from the db for the object with
3527            this GUID, returning attribute being modified. We will then
3528            use this msg as the basis for a modify call */
3529         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3530                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3531                                  DSDB_SEARCH_SHOW_DELETED |
3532                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3533                                  DSDB_SEARCH_REVEAL_INTERNALS,
3534                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3535         if (ret != LDB_SUCCESS) {
3536                 talloc_free(tmp_ctx);
3537                 return ret;
3538         }
3539         if (res->count != 1) {
3540                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3541                                        GUID_string(tmp_ctx, &la->identifier->guid));
3542                 talloc_free(tmp_ctx);
3543                 return LDB_ERR_NO_SUCH_OBJECT;
3544         }
3545         msg = res->msgs[0];
3546
3547         if (msg->num_elements == 0) {
3548                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3549                 if (ret != LDB_SUCCESS) {
3550                         ldb_module_oom(module);
3551                         talloc_free(tmp_ctx);
3552                         return LDB_ERR_OPERATIONS_ERROR;
3553                 }
3554         } else {
3555                 old_el = &msg->elements[0];
3556                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3557         }
3558
3559         /* parse the existing links */
3560         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3561         if (ret != LDB_SUCCESS) {
3562                 talloc_free(tmp_ctx);
3563                 return ret;
3564         }
3565
3566         /* get our invocationId */
3567         our_invocation_id = samdb_ntds_invocation_id(ldb);
3568         if (!our_invocation_id) {
3569                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3570                 talloc_free(tmp_ctx);
3571                 return LDB_ERR_OPERATIONS_ERROR;
3572         }
3573
3574         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, our_invocation_id);
3575         if (ret != LDB_SUCCESS) {
3576                 talloc_free(tmp_ctx);
3577                 return ret;
3578         }
3579
3580         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3581         if (!W_ERROR_IS_OK(status)) {
3582                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3583                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3584                 return LDB_ERR_OPERATIONS_ERROR;
3585         }
3586
3587         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3588         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3589                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3590                                        old_el->name,
3591                                        ldb_dn_get_linearized(dsdb_dn->dn),
3592                                        ldb_dn_get_linearized(msg->dn));
3593                 return LDB_ERR_OPERATIONS_ERROR;
3594         }
3595
3596         /* re-resolve the DN by GUID, as the DRS server may give us an
3597            old DN value */
3598         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
3599         if (ret != LDB_SUCCESS) {
3600                 ldb_asprintf_errstring(ldb, __location__ ": Failed to re-resolve GUID %s",
3601                                        GUID_string(tmp_ctx, &guid));
3602                 talloc_free(tmp_ctx);
3603                 return ret;
3604         }
3605
3606         /* see if this link already exists */
3607         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3608         if (pdn != NULL) {
3609                 /* see if this update is newer than what we have already */
3610                 struct GUID invocation_id = GUID_zero();
3611                 uint32_t version = 0;
3612                 NTTIME change_time = 0;
3613                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3614
3615                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3616                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3617                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3618
3619                 if (!replmd_update_is_newer(&invocation_id,
3620                                             &la->meta_data.originating_invocation_id,
3621                                             version,
3622                                             la->meta_data.version,
3623                                             change_time,
3624                                             la->meta_data.originating_change_time)) {
3625                         DEBUG(1,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3626                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3627                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3628                         talloc_free(tmp_ctx);
3629                         return LDB_SUCCESS;
3630                 }
3631
3632                 /* get a seq_num for this change */
3633                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3634                 if (ret != LDB_SUCCESS) {
3635                         talloc_free(tmp_ctx);
3636                         return ret;
3637                 }
3638
3639                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
3640                         /* remove the existing backlink */
3641                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3642                         if (ret != LDB_SUCCESS) {
3643                                 talloc_free(tmp_ctx);
3644                                 return ret;
3645                         }
3646                 }
3647
3648                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3649                                            &la->meta_data.originating_invocation_id,
3650                                            la->meta_data.originating_usn, seq_num,
3651                                            la->meta_data.originating_change_time,
3652                                            la->meta_data.version,
3653                                            !active);
3654                 if (ret != LDB_SUCCESS) {
3655                         talloc_free(tmp_ctx);
3656                         return ret;
3657                 }
3658
3659                 if (active) {
3660                         /* add the new backlink */
3661                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3662                         if (ret != LDB_SUCCESS) {
3663                                 talloc_free(tmp_ctx);
3664                                 return ret;
3665                         }
3666                 }
3667         } else {
3668                 /* get a seq_num for this change */
3669                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3670                 if (ret != LDB_SUCCESS) {
3671                         talloc_free(tmp_ctx);
3672                         return ret;
3673                 }
3674
3675                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3676                                                 struct ldb_val, old_el->num_values+1);
3677                 if (!old_el->values) {
3678                         ldb_module_oom(module);
3679                         return LDB_ERR_OPERATIONS_ERROR;
3680                 }
3681                 old_el->num_values++;
3682
3683                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3684                                           &la->meta_data.originating_invocation_id,
3685                                           la->meta_data.originating_usn, seq_num,
3686                                           la->meta_data.originating_change_time,
3687                                           la->meta_data.version,
3688                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3689                 if (ret != LDB_SUCCESS) {
3690                         talloc_free(tmp_ctx);
3691                         return ret;
3692                 }
3693
3694                 if (active) {
3695                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3696                                                   true, attr, false);
3697                         if (ret != LDB_SUCCESS) {
3698                                 talloc_free(tmp_ctx);
3699                                 return ret;
3700                         }
3701                 }
3702         }
3703
3704         /* we only change whenChanged and uSNChanged if the seq_num
3705            has changed */
3706         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3707                 talloc_free(tmp_ctx);
3708                 return LDB_ERR_OPERATIONS_ERROR;
3709         }
3710
3711         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3712                 talloc_free(tmp_ctx);
3713                 return LDB_ERR_OPERATIONS_ERROR;
3714         }
3715
3716         ret = dsdb_check_single_valued_link(attr, old_el);
3717         if (ret != LDB_SUCCESS) {
3718                 talloc_free(tmp_ctx);
3719                 return ret;
3720         }
3721
3722         ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
3723         if (ret != LDB_SUCCESS) {
3724                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
3725                           ldb_errstring(ldb),
3726                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
3727                 talloc_free(tmp_ctx);
3728                 return ret;
3729         }
3730
3731         talloc_free(tmp_ctx);
3732
3733         return ret;
3734 }
3735
3736 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
3737 {
3738         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
3739                 return replmd_extended_replicated_objects(module, req);
3740         }
3741
3742         return ldb_next_request(module, req);
3743 }
3744
3745
3746 /*
3747   we hook into the transaction operations to allow us to
3748   perform the linked attribute updates at the end of the whole
3749   transaction. This allows a forward linked attribute to be created
3750   before the object is created. During a vampire, w2k8 sends us linked
3751   attributes before the objects they are part of.
3752  */
3753 static int replmd_start_transaction(struct ldb_module *module)
3754 {
3755         /* create our private structure for this transaction */
3756         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
3757                                                                 struct replmd_private);
3758         replmd_txn_cleanup(replmd_private);
3759
3760         /* free any leftover mod_usn records from cancelled
3761            transactions */
3762         while (replmd_private->ncs) {
3763                 struct nc_entry *e = replmd_private->ncs;
3764                 DLIST_REMOVE(replmd_private->ncs, e);
3765                 talloc_free(e);
3766         }
3767
3768         return ldb_next_start_trans(module);
3769 }
3770
3771 /*
3772   on prepare commit we loop over our queued la_context structures and
3773   apply each of them
3774  */
3775 static int replmd_prepare_commit(struct ldb_module *module)
3776 {
3777         struct replmd_private *replmd_private =
3778                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3779         struct la_entry *la, *prev;
3780         struct la_backlink *bl;
3781         int ret;
3782
3783         /* walk the list backwards, to do the first entry first, as we
3784          * added the entries with DLIST_ADD() which puts them at the
3785          * start of the list */
3786         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
3787                 prev = DLIST_PREV(la);
3788                 DLIST_REMOVE(replmd_private->la_list, la);
3789                 ret = replmd_process_linked_attribute(module, la);
3790                 if (ret != LDB_SUCCESS) {
3791                         replmd_txn_cleanup(replmd_private);
3792                         return ret;
3793                 }
3794         }
3795
3796         /* process our backlink list, creating and deleting backlinks
3797            as necessary */
3798         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
3799                 ret = replmd_process_backlink(module, bl);
3800                 if (ret != LDB_SUCCESS) {
3801                         replmd_txn_cleanup(replmd_private);
3802                         return ret;
3803                 }
3804         }
3805
3806         replmd_txn_cleanup(replmd_private);
3807
3808         /* possibly change @REPLCHANGED */
3809         ret = replmd_notify_store(module);
3810         if (ret != LDB_SUCCESS) {
3811                 return ret;
3812         }
3813
3814         return ldb_next_prepare_commit(module);
3815 }
3816
3817 static int replmd_del_transaction(struct ldb_module *module)
3818 {
3819         struct replmd_private *replmd_private =
3820                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3821         replmd_txn_cleanup(replmd_private);
3822
3823         return ldb_next_del_trans(module);
3824 }
3825
3826
3827 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
3828         .name          = "repl_meta_data",
3829         .init_context      = replmd_init,
3830         .add               = replmd_add,
3831         .modify            = replmd_modify,
3832         .rename            = replmd_rename,
3833         .del               = replmd_delete,
3834         .extended          = replmd_extended,
3835         .start_transaction = replmd_start_transaction,
3836         .prepare_commit    = replmd_prepare_commit,
3837         .del_transaction   = replmd_del_transaction,
3838 };