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
  51 #define W2K3_LINKED_ATTRIBUTES 1
  52
  53 struct replmd_private {
  54         TALLOC_CTX *la_ctx;
  55         struct la_entry *la_list;
  56         TALLOC_CTX *bl_ctx;
  57         struct la_backlink *la_backlinks;
  58         struct nc_entry {
  59                 struct nc_entry *prev, *next;
  60                 struct ldb_dn *dn;
  61                 uint64_t mod_usn;
  62         } *ncs;
  63 };
  64
  65 struct la_entry {
  66         struct la_entry *next, *prev;
  67         struct drsuapi_DsReplicaLinkedAttribute *la;
  68 };
  69
  70 struct replmd_replicated_request {
  71         struct ldb_module *module;
  72         struct ldb_request *req;
  73
  74         const struct dsdb_schema *schema;
  75
  76         /* the controls we pass down */
  77         struct ldb_control **controls;
  78
  79         /* details for the mode where we apply a bunch of inbound replication meessages */
  80         bool apply_mode;
  81         uint32_t index_current;
  82         struct dsdb_extended_replicated_objects *objs;
  83
  84         struct ldb_message *search_msg;
  85
  86         uint64_t seq_num;
  87
  88 };
  89
  90 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
  91
  92
  93 /*
  94   initialise the module
  95   allocate the private structure and build the list
  96   of partition DNs for use by replmd_notify()
  97  */
  98 static int replmd_init(struct ldb_module *module)
  99 {
 100         struct replmd_private *replmd_private;
 101         struct ldb_context *ldb = ldb_module_get_ctx(module);
 102
 103         replmd_private = talloc_zero(module, struct replmd_private);
 104         if (replmd_private == NULL) {
 105                 ldb_oom(ldb);
 106                 return LDB_ERR_OPERATIONS_ERROR;
 107         }
 108         ldb_module_set_private(module, replmd_private);
 109
 110         return ldb_next_init(module);
 111 }
 112
 113 /*
 114   cleanup our per-transaction contexts
 115  */
 116 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 117 {
 118         talloc_free(replmd_private->la_ctx);
 119         replmd_private->la_list = NULL;
 120         replmd_private->la_ctx = NULL;
 121
 122         talloc_free(replmd_private->bl_ctx);
 123         replmd_private->la_backlinks = NULL;
 124         replmd_private->bl_ctx = NULL;
 125 }
 126
 127
 128 struct la_backlink {
 129         struct la_backlink *next, *prev;
 130         const char *attr_name;
 131         struct GUID forward_guid, target_guid;
 132         bool active;
 133 };
 134
 135 /*
 136   process a backlinks we accumulated during a transaction, adding and
 137   deleting the backlinks from the target objects
 138  */
 139 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl)
 140 {
 141         struct ldb_dn *target_dn, *source_dn;
 142         int ret;
 143         struct ldb_context *ldb = ldb_module_get_ctx(module);
 144         struct ldb_message *msg;
 145         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 146         char *dn_string;
 147
 148         /*
 149           - find DN of target
 150           - find DN of source
 151           - construct ldb_message
 152               - either an add or a delete
 153          */
 154         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn);
 155         if (ret != LDB_SUCCESS) {
 156                 ldb_asprintf_errstring(ldb, "Failed to find target DN for linked attribute with GUID %s\n",
 157                                        GUID_string(bl, &bl->target_guid));
 158                 talloc_free(tmp_ctx);
 159                 return ret;
 160         }
 161
 162         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
 163         if (ret != LDB_SUCCESS) {
 164                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 165                                        GUID_string(bl, &bl->forward_guid));
 166                 talloc_free(tmp_ctx);
 167                 return ret;
 168         }
 169
 170         msg = ldb_msg_new(tmp_ctx);
 171         if (msg == NULL) {
 172                 ldb_module_oom(module);
 173                 talloc_free(tmp_ctx);
 174                 return LDB_ERR_OPERATIONS_ERROR;
 175         }
 176
 177         /* construct a ldb_message for adding/deleting the backlink */
 178         msg->dn = target_dn;
 179         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 180         if (!dn_string) {
 181                 ldb_module_oom(module);
 182                 talloc_free(tmp_ctx);
 183                 return LDB_ERR_OPERATIONS_ERROR;
 184         }
 185         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 186         if (ret != LDB_SUCCESS) {
 187                 talloc_free(tmp_ctx);
 188                 return ret;
 189         }
 190         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 191
 192         ret = dsdb_module_modify(module, msg, 0);
 193         if (ret != LDB_SUCCESS) {
 194                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 195                                        bl->active?"add":"remove",
 196                                        ldb_dn_get_linearized(source_dn),
 197                                        ldb_dn_get_linearized(target_dn),
 198                                        ldb_errstring(ldb));
 199                 talloc_free(tmp_ctx);
 200                 return ret;
 201         }
 202         talloc_free(tmp_ctx);
 203         return ret;
 204 }
 205
 206 /*
 207   add a backlink to the list of backlinks to add/delete in the prepare
 208   commit
 209  */
 210 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 211                                struct GUID *forward_guid, struct GUID *target_guid,
 212                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 213 {
 214         const struct dsdb_attribute *target_attr;
 215         struct la_backlink *bl;
 216         struct replmd_private *replmd_private =
 217                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 218
 219         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID + 1);
 220         if (!target_attr) {
 221                 /*
 222                  * windows 2003 has a broken schema where the
 223                  * definition of msDS-IsDomainFor is missing (which is
 224                  * supposed to be the backlink of the
 225                  * msDS-HasDomainNCs attribute
 226                  */
 227                 return LDB_SUCCESS;
 228         }
 229
 230         /* see if its already in the list */
 231         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 232                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 233                     GUID_equal(target_guid, &bl->target_guid) &&
 234                     (target_attr->lDAPDisplayName == bl->attr_name ||
 235                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 236                         break;
 237                 }
 238         }
 239
 240         if (bl) {
 241                 /* we found an existing one */
 242                 if (bl->active == active) {
 243                         return LDB_SUCCESS;
 244                 }
 245                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 246                 talloc_free(bl);
 247                 return LDB_SUCCESS;
 248         }
 249
 250         if (replmd_private->bl_ctx == NULL) {
 251                 replmd_private->bl_ctx = talloc_new(replmd_private);
 252                 if (replmd_private->bl_ctx == NULL) {
 253                         ldb_module_oom(module);
 254                         return LDB_ERR_OPERATIONS_ERROR;
 255                 }
 256         }
 257
 258         /* its a new one */
 259         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 260         if (bl == NULL) {
 261                 ldb_module_oom(module);
 262                 return LDB_ERR_OPERATIONS_ERROR;
 263         }
 264
 265         bl->attr_name = target_attr->lDAPDisplayName;
 266         bl->forward_guid = *forward_guid;
 267         bl->target_guid = *target_guid;
 268         bl->active = active;
 269
 270         /* the caller may ask for this backlink to be processed
 271            immediately */
 272         if (immediate) {
 273                 int ret = replmd_process_backlink(module, bl);
 274                 talloc_free(bl);
 275                 return ret;
 276         }
 277
 278         DLIST_ADD(replmd_private->la_backlinks, bl);
 279
 280         return LDB_SUCCESS;
 281 }
 282
 283
 284 /*
 285  * Callback for most write operations in this module:
 286  *
 287  * notify the repl task that a object has changed. The notifies are
 288  * gathered up in the replmd_private structure then written to the
 289  * @REPLCHANGED object in each partition during the prepare_commit
 290  */
 291 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 292 {
 293         int ret;
 294         struct replmd_replicated_request *ac =
 295                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 296         struct replmd_private *replmd_private =
 297                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 298         struct nc_entry *modified_partition;
 299         struct ldb_control *partition_ctrl;
 300         const struct dsdb_control_current_partition *partition;
 301
 302         struct ldb_control **controls;
 303
 304         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 305
 306         /* Remove the 'partition' control from what we pass up the chain */
 307         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 308
 309         if (ares->error != LDB_SUCCESS) {
 310                 return ldb_module_done(ac->req, controls,
 311                                         ares->response, ares->error);
 312         }
 313
 314         if (ares->type != LDB_REPLY_DONE) {
 315                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 316                 return ldb_module_done(ac->req, NULL,
 317                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 318         }
 319
 320         if (!partition_ctrl) {
 321                 return ldb_module_done(ac->req, NULL,
 322                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 323         }
 324
 325         partition = talloc_get_type_abort(partition_ctrl->data,
 326                                     struct dsdb_control_current_partition);
 327
 328         if (ac->seq_num > 0) {
 329                 for (modified_partition = replmd_private->ncs; modified_partition;
 330                      modified_partition = modified_partition->next) {
 331                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 332                                 break;
 333                         }
 334                 }
 335
 336                 if (modified_partition == NULL) {
 337                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 338                         if (!modified_partition) {
 339                                 ldb_oom(ldb_module_get_ctx(ac->module));
 340                                 return ldb_module_done(ac->req, NULL,
 341                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 342                         }
 343                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 344                         if (!modified_partition->dn) {
 345                                 ldb_oom(ldb_module_get_ctx(ac->module));
 346                                 return ldb_module_done(ac->req, NULL,
 347                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 348                         }
 349                         DLIST_ADD(replmd_private->ncs, modified_partition);
 350                 }
 351
 352                 if (ac->seq_num > modified_partition->mod_usn) {
 353                         modified_partition->mod_usn = ac->seq_num;
 354                 }
 355         }
 356
 357         if (ac->apply_mode) {
 358                 talloc_free(ares);
 359                 ac->index_current++;
 360
 361                 ret = replmd_replicated_apply_next(ac);
 362                 if (ret != LDB_SUCCESS) {
 363                         return ldb_module_done(ac->req, NULL, NULL, ret);
 364                 }
 365                 return ret;
 366         } else {
 367                 /* free the partition control container here, for the
 368                  * common path.  Other cases will have it cleaned up
 369                  * eventually with the ares */
 370                 talloc_free(partition_ctrl);
 371                 return ldb_module_done(ac->req,
 372                                        controls_except_specified(controls, ares, partition_ctrl),
 373                                        ares->response, LDB_SUCCESS);
 374         }
 375 }
 376
 377
 378 /*
 379  * update a @REPLCHANGED record in each partition if there have been
 380  * any writes of replicated data in the partition
 381  */
 382 static int replmd_notify_store(struct ldb_module *module)
 383 {
 384         struct replmd_private *replmd_private =
 385                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 386         struct ldb_context *ldb = ldb_module_get_ctx(module);
 387
 388         while (replmd_private->ncs) {
 389                 int ret;
 390                 struct nc_entry *modified_partition = replmd_private->ncs;
 391
 392                 ret = dsdb_save_partition_usn(ldb, modified_partition->dn, modified_partition->mod_usn);
 393                 if (ret != LDB_SUCCESS) {
 394                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 395                                  ldb_dn_get_linearized(modified_partition->dn)));
 396                         return ret;
 397                 }
 398                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 399                 talloc_free(modified_partition);
 400         }
 401
 402         return LDB_SUCCESS;
 403 }
 404
 405
 406 /*
 407   created a replmd_replicated_request context
 408  */
 409 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 410                                                          struct ldb_request *req)
 411 {
 412         struct ldb_context *ldb;
 413         struct replmd_replicated_request *ac;
 414
 415         ldb = ldb_module_get_ctx(module);
 416
 417         ac = talloc_zero(req, struct replmd_replicated_request);
 418         if (ac == NULL) {
 419                 ldb_oom(ldb);
 420                 return NULL;
 421         }
 422
 423         ac->module = module;
 424         ac->req = req;
 425
 426         ac->schema = dsdb_get_schema(ldb);
 427         if (!ac->schema) {
 428                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 429                               "replmd_modify: no dsdb_schema loaded");
 430                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 431                 return NULL;
 432         }
 433
 434         return ac;
 435 }
 436
 437 /*
 438   add a time element to a record
 439 */
 440 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 441 {
 442         struct ldb_message_element *el;
 443         char *s;
 444
 445         if (ldb_msg_find_element(msg, attr) != NULL) {
 446                 return LDB_SUCCESS;
 447         }
 448
 449         s = ldb_timestring(msg, t);
 450         if (s == NULL) {
 451                 return LDB_ERR_OPERATIONS_ERROR;
 452         }
 453
 454         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 455                 return LDB_ERR_OPERATIONS_ERROR;
 456         }
 457
 458         el = ldb_msg_find_element(msg, attr);
 459         /* always set as replace. This works because on add ops, the flag
 460            is ignored */
 461         el->flags = LDB_FLAG_MOD_REPLACE;
 462
 463         return LDB_SUCCESS;
 464 }
 465
 466 /*
 467   add a uint64_t element to a record
 468 */
 469 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 470 {
 471         struct ldb_message_element *el;
 472
 473         if (ldb_msg_find_element(msg, attr) != NULL) {
 474                 return LDB_SUCCESS;
 475         }
 476
 477         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 478                 return LDB_ERR_OPERATIONS_ERROR;
 479         }
 480
 481         el = ldb_msg_find_element(msg, attr);
 482         /* always set as replace. This works because on add ops, the flag
 483            is ignored */
 484         el->flags = LDB_FLAG_MOD_REPLACE;
 485
 486         return LDB_SUCCESS;
 487 }
 488
 489 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 490                                                    const struct replPropertyMetaData1 *m2,
 491                                                    const uint32_t *rdn_attid)
 492 {
 493         if (m1->attid == m2->attid) {
 494                 return 0;
 495         }
 496
 497         /*
 498          * the rdn attribute should be at the end!
 499          * so we need to return a value greater than zero
 500          * which means m1 is greater than m2
 501          */
 502         if (m1->attid == *rdn_attid) {
 503                 return 1;
 504         }
 505
 506         /*
 507          * the rdn attribute should be at the end!
 508          * so we need to return a value less than zero
 509          * which means m2 is greater than m1
 510          */
 511         if (m2->attid == *rdn_attid) {
 512                 return -1;
 513         }
 514
 515         return m1->attid > m2->attid ? 1 : -1;
 516 }
 517
 518 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 519                                                 const struct dsdb_schema *schema,
 520                                                 struct ldb_dn *dn)
 521 {
 522         const char *rdn_name;
 523         const struct dsdb_attribute *rdn_sa;
 524
 525         rdn_name = ldb_dn_get_rdn_name(dn);
 526         if (!rdn_name) {
 527                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 528                 return LDB_ERR_OPERATIONS_ERROR;
 529         }
 530
 531         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 532         if (rdn_sa == NULL) {
 533                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 534                 return LDB_ERR_OPERATIONS_ERROR;
 535         }
 536
 537         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 538                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 539
 540         ldb_qsort(ctr1->array, ctr1->count, sizeof(struct replPropertyMetaData1),
 541                   discard_const_p(void, &rdn_sa->attributeID_id),
 542                   (ldb_qsort_cmp_fn_t)replmd_replPropertyMetaData1_attid_sort);
 543
 544         return LDB_SUCCESS;
 545 }
 546
 547 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 548                                                  const struct ldb_message_element *e2,
 549                                                  const struct dsdb_schema *schema)
 550 {
 551         const struct dsdb_attribute *a1;
 552         const struct dsdb_attribute *a2;
 553
 554         /*
 555          * TODO: make this faster by caching the dsdb_attribute pointer
 556          *       on the ldb_messag_element
 557          */
 558
 559         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 560         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 561
 562         /*
 563          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 564          *       in the schema
 565          */
 566         if (!a1 || !a2) {
 567                 return strcasecmp(e1->name, e2->name);
 568         }
 569         if (a1->attributeID_id == a2->attributeID_id) {
 570                 return 0;
 571         }
 572         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 573 }
 574
 575 static void replmd_ldb_message_sort(struct ldb_message *msg,
 576                                     const struct dsdb_schema *schema)
 577 {
 578         ldb_qsort(msg->elements, msg->num_elements, sizeof(struct ldb_message_element),
 579                   discard_const_p(void, schema), (ldb_qsort_cmp_fn_t)replmd_ldb_message_element_attid_sort);
 580 }
 581
 582 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 583                                const struct GUID *invocation_id, uint64_t seq_num,
 584                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 585
 586
 587 /*
 588   fix up linked attributes in replmd_add.
 589   This involves setting up the right meta-data in extended DN
 590   components, and creating backlinks to the object
 591  */
 592 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 593                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 594                              struct GUID *guid, const struct dsdb_attribute *sa)
 595 {
 596         int i;
 597         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 598         struct ldb_context *ldb = ldb_module_get_ctx(module);
 599         struct dsdb_schema *schema = dsdb_get_schema(ldb);
 600         NTTIME now;
 601
 602         unix_to_nt_time(&now, t);
 603
 604         for (i=0; i<el->num_values; i++) {
 605                 struct ldb_val *v = &el->values[i];
 606                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 607                 struct GUID target_guid;
 608                 NTSTATUS status;
 609                 int ret;
 610
 611                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 612                                           seq_num, seq_num, now, 0, false);
 613                 if (ret != LDB_SUCCESS) {
 614                         talloc_free(tmp_ctx);
 615                         return ret;
 616                 }
 617
 618                 /* note that the DN already has the extended
 619                    components from the extended_dn_store module */
 620                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 621                 if (!NT_STATUS_IS_OK(status)) {
 622                         talloc_free(tmp_ctx);
 623                         return LDB_ERR_OPERATIONS_ERROR;
 624                 }
 625
 626                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 627                 if (ret != LDB_SUCCESS) {
 628                         talloc_free(tmp_ctx);
 629                         return ret;
 630                 }
 631         }
 632
 633         talloc_free(tmp_ctx);
 634         return LDB_SUCCESS;
 635 }
 636
 637
 638 /*
 639   intercept add requests
 640  */
 641 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 642 {
 643         struct ldb_context *ldb;
 644         struct ldb_control *control;
 645         struct replmd_replicated_request *ac;
 646         enum ndr_err_code ndr_err;
 647         struct ldb_request *down_req;
 648         struct ldb_message *msg;
 649         const DATA_BLOB *guid_blob;
 650         struct GUID guid;
 651         struct replPropertyMetaDataBlob nmd;
 652         struct ldb_val nmd_value;
 653         const struct GUID *our_invocation_id;
 654         time_t t = time(NULL);
 655         NTTIME now;
 656         char *time_str;
 657         int ret;
 658         uint32_t i, ni=0;
 659         bool allow_add_guid = false;
 660         bool remove_current_guid = false;
 661
 662         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 663         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 664         if (control) {
 665                 allow_add_guid = 1;
 666         }
 667
 668         /* do not manipulate our control entries */
 669         if (ldb_dn_is_special(req->op.add.message->dn)) {
 670                 return ldb_next_request(module, req);
 671         }
 672
 673         ldb = ldb_module_get_ctx(module);
 674
 675         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 676
 677         ac = replmd_ctx_init(module, req);
 678         if (!ac) {
 679                 return LDB_ERR_OPERATIONS_ERROR;
 680         }
 681
 682         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 683         if ( guid_blob != NULL ) {
 684                 if( !allow_add_guid ) {
 685                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 686                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 687                         talloc_free(ac);
 688                         return LDB_ERR_UNWILLING_TO_PERFORM;
 689                 } else {
 690                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 691                         if ( !NT_STATUS_IS_OK(status)) {
 692                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 693                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 694                                 talloc_free(ac);
 695                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 696                         }
 697                         /* we remove this attribute as it can be a string and will not be treated
 698                         correctly and then we will readd it latter on in the good format*/
 699                         remove_current_guid = true;
 700                 }
 701         } else {
 702                 /* a new GUID */
 703                 guid = GUID_random();
 704         }
 705
 706         /* Get a sequence number from the backend */
 707         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 708         if (ret != LDB_SUCCESS) {
 709                 talloc_free(ac);
 710                 return ret;
 711         }
 712
 713         /* get our invocationId */
 714         our_invocation_id = samdb_ntds_invocation_id(ldb);
 715         if (!our_invocation_id) {
 716                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 717                               "replmd_add: unable to find invocationId\n");
 718                 talloc_free(ac);
 719                 return LDB_ERR_OPERATIONS_ERROR;
 720         }
 721
 722         /* we have to copy the message as the caller might have it as a const */
 723         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 724         if (msg == NULL) {
 725                 ldb_oom(ldb);
 726                 talloc_free(ac);
 727                 return LDB_ERR_OPERATIONS_ERROR;
 728         }
 729
 730         /* generated times */
 731         unix_to_nt_time(&now, t);
 732         time_str = ldb_timestring(msg, t);
 733         if (!time_str) {
 734                 ldb_oom(ldb);
 735                 talloc_free(ac);
 736                 return LDB_ERR_OPERATIONS_ERROR;
 737         }
 738         if (remove_current_guid) {
 739                 ldb_msg_remove_attr(msg,"objectGUID");
 740         }
 741
 742         /*
 743          * remove autogenerated attributes
 744          */
 745         ldb_msg_remove_attr(msg, "whenCreated");
 746         ldb_msg_remove_attr(msg, "whenChanged");
 747         ldb_msg_remove_attr(msg, "uSNCreated");
 748         ldb_msg_remove_attr(msg, "uSNChanged");
 749         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 750
 751         /*
 752          * readd replicated attributes
 753          */
 754         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 755         if (ret != LDB_SUCCESS) {
 756                 ldb_oom(ldb);
 757                 talloc_free(ac);
 758                 return ret;
 759         }
 760
 761         /* build the replication meta_data */
 762         ZERO_STRUCT(nmd);
 763         nmd.version             = 1;
 764         nmd.ctr.ctr1.count      = msg->num_elements;
 765         nmd.ctr.ctr1.array      = talloc_array(msg,
 766                                                struct replPropertyMetaData1,
 767                                                nmd.ctr.ctr1.count);
 768         if (!nmd.ctr.ctr1.array) {
 769                 ldb_oom(ldb);
 770                 talloc_free(ac);
 771                 return LDB_ERR_OPERATIONS_ERROR;
 772         }
 773
 774         for (i=0; i < msg->num_elements; i++) {
 775                 struct ldb_message_element *e = &msg->elements[i];
 776                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 777                 const struct dsdb_attribute *sa;
 778
 779                 if (e->name[0] == '@') continue;
 780
 781                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 782                 if (!sa) {
 783                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 784                                       "replmd_add: attribute '%s' not defined in schema\n",
 785                                       e->name);
 786                         talloc_free(ac);
 787                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 788                 }
 789
 790                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 791                         /* if the attribute is not replicated (0x00000001)
 792                          * or constructed (0x00000004) it has no metadata
 793                          */
 794                         continue;
 795                 }
 796
 797 #if W2K3_LINKED_ATTRIBUTES
 798                 if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 799                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 800                         if (ret != LDB_SUCCESS) {
 801                                 talloc_free(ac);
 802                                 return ret;
 803                         }
 804                         /* linked attributes are not stored in
 805                            replPropertyMetaData in FL above w2k */
 806                         continue;
 807                 }
 808 #endif
 809
 810                 m->attid                        = sa->attributeID_id;
 811                 m->version                      = 1;
 812                 m->originating_change_time      = now;
 813                 m->originating_invocation_id    = *our_invocation_id;
 814                 m->originating_usn              = ac->seq_num;
 815                 m->local_usn                    = ac->seq_num;
 816                 ni++;
 817         }
 818
 819         /* fix meta data count */
 820         nmd.ctr.ctr1.count = ni;
 821
 822         /*
 823          * sort meta data array, and move the rdn attribute entry to the end
 824          */
 825         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 826         if (ret != LDB_SUCCESS) {
 827                 talloc_free(ac);
 828                 return ret;
 829         }
 830
 831         /* generated NDR encoded values */
 832         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 833                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 834                                        &nmd,
 835                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 836         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 837                 ldb_oom(ldb);
 838                 talloc_free(ac);
 839                 return LDB_ERR_OPERATIONS_ERROR;
 840         }
 841
 842         /*
 843          * add the autogenerated values
 844          */
 845         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 846         if (ret != LDB_SUCCESS) {
 847                 ldb_oom(ldb);
 848                 talloc_free(ac);
 849                 return ret;
 850         }
 851         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 852         if (ret != LDB_SUCCESS) {
 853                 ldb_oom(ldb);
 854                 talloc_free(ac);
 855                 return ret;
 856         }
 857         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 858         if (ret != LDB_SUCCESS) {
 859                 ldb_oom(ldb);
 860                 talloc_free(ac);
 861                 return ret;
 862         }
 863         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 864         if (ret != LDB_SUCCESS) {
 865                 ldb_oom(ldb);
 866                 talloc_free(ac);
 867                 return ret;
 868         }
 869         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 870         if (ret != LDB_SUCCESS) {
 871                 ldb_oom(ldb);
 872                 talloc_free(ac);
 873                 return ret;
 874         }
 875
 876         /*
 877          * sort the attributes by attid before storing the object
 878          */
 879         replmd_ldb_message_sort(msg, ac->schema);
 880
 881         ret = ldb_build_add_req(&down_req, ldb, ac,
 882                                 msg,
 883                                 req->controls,
 884                                 ac, replmd_op_callback,
 885                                 req);
 886         if (ret != LDB_SUCCESS) {
 887                 talloc_free(ac);
 888                 return ret;
 889         }
 890
 891         /* mark the control done */
 892         if (control) {
 893                 control->critical = 0;
 894         }
 895
 896         /* go on with the call chain */
 897         return ldb_next_request(module, down_req);
 898 }
 899
 900
 901 /*
 902  * update the replPropertyMetaData for one element
 903  */
 904 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 905                                       struct ldb_message *msg,
 906                                       struct ldb_message_element *el,
 907                                       struct replPropertyMetaDataBlob *omd,
 908                                       const struct dsdb_schema *schema,
 909                                       uint64_t *seq_num,
 910                                       const struct GUID *our_invocation_id,
 911                                       NTTIME now)
 912 {
 913         int i;
 914         const struct dsdb_attribute *a;
 915         struct replPropertyMetaData1 *md1;
 916
 917         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
 918         if (a == NULL) {
 919                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
 920                          el->name));
 921                 return LDB_ERR_OPERATIONS_ERROR;
 922         }
 923
 924         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 925                 return LDB_SUCCESS;
 926         }
 927
 928         for (i=0; i<omd->ctr.ctr1.count; i++) {
 929                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
 930         }
 931
 932 #if W2K3_LINKED_ATTRIBUTES
 933         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 934                 /* linked attributes are not stored in
 935                    replPropertyMetaData in FL above w2k, but we do
 936                    raise the seqnum for the object  */
 937                 if (*seq_num == 0 &&
 938                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
 939                         return LDB_ERR_OPERATIONS_ERROR;
 940                 }
 941                 return LDB_SUCCESS;
 942         }
 943 #endif
 944
 945         if (i == omd->ctr.ctr1.count) {
 946                 /* we need to add a new one */
 947                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
 948                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
 949                 if (omd->ctr.ctr1.array == NULL) {
 950                         ldb_oom(ldb);
 951                         return LDB_ERR_OPERATIONS_ERROR;
 952                 }
 953                 omd->ctr.ctr1.count++;
 954                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
 955         }
 956
 957         /* Get a new sequence number from the backend. We only do this
 958          * if we have a change that requires a new
 959          * replPropertyMetaData element
 960          */
 961         if (*seq_num == 0) {
 962                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
 963                 if (ret != LDB_SUCCESS) {
 964                         return LDB_ERR_OPERATIONS_ERROR;
 965                 }
 966         }
 967
 968         md1 = &omd->ctr.ctr1.array[i];
 969         md1->version++;
 970         md1->attid                     = a->attributeID_id;
 971         md1->originating_change_time   = now;
 972         md1->originating_invocation_id = *our_invocation_id;
 973         md1->originating_usn           = *seq_num;
 974         md1->local_usn                 = *seq_num;
 975
 976         return LDB_SUCCESS;
 977 }
 978
 979 /*
 980  * update the replPropertyMetaData object each time we modify an
 981  * object. This is needed for DRS replication, as the merge on the
 982  * client is based on this object
 983  */
 984 static int replmd_update_rpmd(struct ldb_module *module,
 985                               const struct dsdb_schema *schema,
 986                               struct ldb_message *msg, uint64_t *seq_num,
 987                               time_t t)
 988 {
 989         const struct ldb_val *omd_value;
 990         enum ndr_err_code ndr_err;
 991         struct replPropertyMetaDataBlob omd;
 992         int i;
 993         NTTIME now;
 994         const struct GUID *our_invocation_id;
 995         int ret;
 996         const char *attrs[] = { "replPropertyMetaData" , NULL };
 997         struct ldb_result *res;
 998         struct ldb_context *ldb;
 999
1000         ldb = ldb_module_get_ctx(module);
1001
1002         our_invocation_id = samdb_ntds_invocation_id(ldb);
1003         if (!our_invocation_id) {
1004                 /* this happens during an initial vampire while
1005                    updating the schema */
1006                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1007                 return LDB_SUCCESS;
1008         }
1009
1010         unix_to_nt_time(&now, t);
1011
1012         /* search for the existing replPropertyMetaDataBlob */
1013         ret = dsdb_search_dn_with_deleted(ldb, msg, &res, msg->dn, attrs);
1014         if (ret != LDB_SUCCESS || res->count != 1) {
1015                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1016                          ldb_dn_get_linearized(msg->dn)));
1017                 return LDB_ERR_OPERATIONS_ERROR;
1018         }
1019
1020
1021         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1022         if (!omd_value) {
1023                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1024                          ldb_dn_get_linearized(msg->dn)));
1025                 return LDB_ERR_OPERATIONS_ERROR;
1026         }
1027
1028         ndr_err = ndr_pull_struct_blob(omd_value, msg,
1029                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
1030                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1031         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1032                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1033                          ldb_dn_get_linearized(msg->dn)));
1034                 return LDB_ERR_OPERATIONS_ERROR;
1035         }
1036
1037         if (omd.version != 1) {
1038                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1039                          omd.version, ldb_dn_get_linearized(msg->dn)));
1040                 return LDB_ERR_OPERATIONS_ERROR;
1041         }
1042
1043         for (i=0; i<msg->num_elements; i++) {
1044                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], &omd, schema, seq_num,
1045                                                  our_invocation_id, now);
1046                 if (ret != LDB_SUCCESS) {
1047                         return ret;
1048                 }
1049         }
1050
1051         /*
1052          * replmd_update_rpmd_element has done an update if the
1053          * seq_num is set
1054          */
1055         if (*seq_num != 0) {
1056                 struct ldb_val *md_value;
1057                 struct ldb_message_element *el;
1058
1059                 md_value = talloc(msg, struct ldb_val);
1060                 if (md_value == NULL) {
1061                         ldb_oom(ldb);
1062                         return LDB_ERR_OPERATIONS_ERROR;
1063                 }
1064
1065                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1066                 if (ret != LDB_SUCCESS) {
1067                         return ret;
1068                 }
1069
1070                 ndr_err = ndr_push_struct_blob(md_value, msg,
1071                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1072                                                &omd,
1073                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1074                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1075                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1076                                  ldb_dn_get_linearized(msg->dn)));
1077                         return LDB_ERR_OPERATIONS_ERROR;
1078                 }
1079
1080                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1081                 if (ret != LDB_SUCCESS) {
1082                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1083                                  ldb_dn_get_linearized(msg->dn)));
1084                         return ret;
1085                 }
1086
1087                 el->num_values = 1;
1088                 el->values = md_value;
1089         }
1090
1091         return LDB_SUCCESS;
1092 }
1093
1094
1095 struct parsed_dn {
1096         struct dsdb_dn *dsdb_dn;
1097         struct GUID *guid;
1098         struct ldb_val *v;
1099 };
1100
1101 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1102 {
1103         return GUID_compare(pdn1->guid, pdn2->guid);
1104 }
1105
1106 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid)
1107 {
1108         struct parsed_dn *ret;
1109         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1110         return ret;
1111 }
1112
1113 /*
1114   get a series of message element values as an array of DNs and GUIDs
1115   the result is sorted by GUID
1116  */
1117 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1118                           struct ldb_message_element *el, struct parsed_dn **pdn,
1119                           const char *ldap_oid)
1120 {
1121         int i;
1122         struct ldb_context *ldb = ldb_module_get_ctx(module);
1123
1124         if (el == NULL) {
1125                 *pdn = NULL;
1126                 return LDB_SUCCESS;
1127         }
1128
1129         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1130         if (!*pdn) {
1131                 ldb_module_oom(module);
1132                 return LDB_ERR_OPERATIONS_ERROR;
1133         }
1134
1135         for (i=0; i<el->num_values; i++) {
1136                 struct ldb_val *v = &el->values[i];
1137                 NTSTATUS status;
1138                 struct ldb_dn *dn;
1139                 struct parsed_dn *p;
1140
1141                 p = &(*pdn)[i];
1142
1143                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1144                 if (p->dsdb_dn == NULL) {
1145                         return LDB_ERR_INVALID_DN_SYNTAX;
1146                 }
1147
1148                 dn = p->dsdb_dn->dn;
1149
1150                 p->guid = talloc(*pdn, struct GUID);
1151                 if (p->guid == NULL) {
1152                         ldb_module_oom(module);
1153                         return LDB_ERR_OPERATIONS_ERROR;
1154                 }
1155
1156                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1157                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1158                         /* we got a DN without a GUID - go find the GUID */
1159                         int ret = dsdb_find_guid_by_dn(ldb, dn, p->guid);
1160                         if (ret != LDB_SUCCESS) {
1161                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1162                                                        ldb_dn_get_linearized(dn));
1163                                 return ret;
1164                         }
1165                 } else if (!NT_STATUS_IS_OK(status)) {
1166                         return LDB_ERR_OPERATIONS_ERROR;
1167                 }
1168
1169                 /* keep a pointer to the original ldb_val */
1170                 p->v = v;
1171         }
1172
1173         qsort(*pdn, el->num_values, sizeof((*pdn)[0]), (comparison_fn_t)parsed_dn_compare);
1174
1175         return LDB_SUCCESS;
1176 }
1177
1178 /*
1179   build a new extended DN, including all meta data fields
1180
1181   DELETED             = 1 or missing
1182   RMD_ADDTIME         = originating_add_time
1183   RMD_INVOCID         = originating_invocation_id
1184   RMD_CHANGETIME      = originating_change_time
1185   RMD_ORIGINATING_USN = originating_usn
1186   RMD_LOCAL_USN       = local_usn
1187   RMD_VERSION         = version
1188  */
1189 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1190                                const struct GUID *invocation_id, uint64_t seq_num,
1191                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1192 {
1193         struct ldb_dn *dn = dsdb_dn->dn;
1194         const char *tstring, *usn_string;
1195         struct ldb_val tval;
1196         struct ldb_val iid;
1197         struct ldb_val usnv, local_usnv;
1198         struct ldb_val vers;
1199         NTSTATUS status;
1200         int ret;
1201         const char *dnstring;
1202         char *vstring;
1203
1204         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1205         if (!tstring) {
1206                 return LDB_ERR_OPERATIONS_ERROR;
1207         }
1208         tval = data_blob_string_const(tstring);
1209
1210         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1211         if (!usn_string) {
1212                 return LDB_ERR_OPERATIONS_ERROR;
1213         }
1214         usnv = data_blob_string_const(usn_string);
1215
1216         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1217         if (!usn_string) {
1218                 return LDB_ERR_OPERATIONS_ERROR;
1219         }
1220         local_usnv = data_blob_string_const(usn_string);
1221
1222         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1223         vers = data_blob_string_const(vstring);
1224
1225         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1226         if (!NT_STATUS_IS_OK(status)) {
1227                 return LDB_ERR_OPERATIONS_ERROR;
1228         }
1229
1230         if (deleted) {
1231                 struct ldb_val dv;
1232                 dv = data_blob_string_const("1");
1233                 ret = ldb_dn_set_extended_component(dn, "DELETED", &dv);
1234         } else {
1235                 ret = ldb_dn_set_extended_component(dn, "DELETED", NULL);
1236         }
1237         if (ret != LDB_SUCCESS) return ret;
1238         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1239         if (ret != LDB_SUCCESS) return ret;
1240         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1241         if (ret != LDB_SUCCESS) return ret;
1242         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1243         if (ret != LDB_SUCCESS) return ret;
1244         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1245         if (ret != LDB_SUCCESS) return ret;
1246         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1247         if (ret != LDB_SUCCESS) return ret;
1248         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1249         if (ret != LDB_SUCCESS) return ret;
1250
1251         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1252         if (dnstring == NULL) {
1253                 return LDB_ERR_OPERATIONS_ERROR;
1254         }
1255         *v = data_blob_string_const(dnstring);
1256
1257         return LDB_SUCCESS;
1258 }
1259
1260 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1261                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1262                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1263                                 uint32_t version, bool deleted);
1264
1265 /*
1266   check if any links need upgrading from w2k format
1267  */
1268 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, const struct GUID *invocation_id)
1269 {
1270         int i;
1271         for (i=0; i<count; i++) {
1272                 NTSTATUS status;
1273                 uint32_t version;
1274                 int ret;
1275
1276                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1277                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1278                         continue;
1279                 }
1280
1281                 /* it's an old one that needs upgrading */
1282                 ret = replmd_update_la_val(dns, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1283                                            1, 1, 0, 0, false);
1284                 if (ret != LDB_SUCCESS) {
1285                         return ret;
1286                 }
1287         }
1288         return LDB_SUCCESS;
1289 }
1290
1291 /*
1292   update an extended DN, including all meta data fields
1293
1294   see replmd_build_la_val for value names
1295  */
1296 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1297                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1298                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1299                                 uint32_t version, bool deleted)
1300 {
1301         struct ldb_dn *dn = dsdb_dn->dn;
1302         const char *tstring, *usn_string;
1303         struct ldb_val tval;
1304         struct ldb_val iid;
1305         struct ldb_val usnv, local_usnv;
1306         struct ldb_val vers;
1307         const struct ldb_val *old_addtime;
1308         uint32_t old_version;
1309         NTSTATUS status;
1310         int ret;
1311         const char *dnstring;
1312         char *vstring;
1313
1314         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1315         if (!tstring) {
1316                 return LDB_ERR_OPERATIONS_ERROR;
1317         }
1318         tval = data_blob_string_const(tstring);
1319
1320         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1321         if (!usn_string) {
1322                 return LDB_ERR_OPERATIONS_ERROR;
1323         }
1324         usnv = data_blob_string_const(usn_string);
1325
1326         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1327         if (!usn_string) {
1328                 return LDB_ERR_OPERATIONS_ERROR;
1329         }
1330         local_usnv = data_blob_string_const(usn_string);
1331
1332         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1333         if (!NT_STATUS_IS_OK(status)) {
1334                 return LDB_ERR_OPERATIONS_ERROR;
1335         }
1336
1337         if (deleted) {
1338                 struct ldb_val dv;
1339                 dv = data_blob_string_const("1");
1340                 ret = ldb_dn_set_extended_component(dn, "DELETED", &dv);
1341         } else {
1342                 ret = ldb_dn_set_extended_component(dn, "DELETED", NULL);
1343         }
1344         if (ret != LDB_SUCCESS) return ret;
1345
1346         /* get the ADDTIME from the original */
1347         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1348         if (old_addtime == NULL) {
1349                 old_addtime = &tval;
1350         }
1351         if (dsdb_dn != old_dsdb_dn) {
1352                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1353                 if (ret != LDB_SUCCESS) return ret;
1354         }
1355
1356         /* use our invocation id */
1357         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1358         if (ret != LDB_SUCCESS) return ret;
1359
1360         /* changetime is the current time */
1361         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1362         if (ret != LDB_SUCCESS) return ret;
1363
1364         /* update the USN */
1365         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1366         if (ret != LDB_SUCCESS) return ret;
1367
1368         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1369         if (ret != LDB_SUCCESS) return ret;
1370
1371         /* increase the version by 1 */
1372         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1373         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1374                 version = old_version+1;
1375         }
1376         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1377         vers = data_blob_string_const(vstring);
1378         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1379         if (ret != LDB_SUCCESS) return ret;
1380
1381         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1382         if (dnstring == NULL) {
1383                 return LDB_ERR_OPERATIONS_ERROR;
1384         }
1385         *v = data_blob_string_const(dnstring);
1386
1387         return LDB_SUCCESS;
1388 }
1389
1390 /*
1391   handle adding a linked attribute
1392  */
1393 static int replmd_modify_la_add(struct ldb_module *module,
1394                                 struct dsdb_schema *schema,
1395                                 struct ldb_message *msg,
1396                                 struct ldb_message_element *el,
1397                                 struct ldb_message_element *old_el,
1398                                 const struct dsdb_attribute *schema_attr,
1399                                 uint64_t seq_num,
1400                                 time_t t,
1401                                 struct GUID *msg_guid)
1402 {
1403         int i;
1404         struct parsed_dn *dns, *old_dns;
1405         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1406         int ret;
1407         struct ldb_val *new_values = NULL;
1408         unsigned int num_new_values = 0;
1409         unsigned old_num_values = old_el?old_el->num_values:0;
1410         const struct GUID *invocation_id;
1411         struct ldb_context *ldb = ldb_module_get_ctx(module);
1412         NTTIME now;
1413
1414         unix_to_nt_time(&now, t);
1415
1416         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1417         if (ret != LDB_SUCCESS) {
1418                 talloc_free(tmp_ctx);
1419                 return ret;
1420         }
1421
1422         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1423         if (ret != LDB_SUCCESS) {
1424                 talloc_free(tmp_ctx);
1425                 return ret;
1426         }
1427
1428         invocation_id = samdb_ntds_invocation_id(ldb);
1429         if (!invocation_id) {
1430                 talloc_free(tmp_ctx);
1431                 return LDB_ERR_OPERATIONS_ERROR;
1432         }
1433
1434         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1435         if (ret != LDB_SUCCESS) {
1436                 talloc_free(tmp_ctx);
1437                 return ret;
1438         }
1439
1440         /* for each new value, see if it exists already with the same GUID */
1441         for (i=0; i<el->num_values; i++) {
1442                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid);
1443                 if (p == NULL) {
1444                         /* this is a new linked attribute value */
1445                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1446                         if (new_values == NULL) {
1447                                 ldb_module_oom(module);
1448                                 talloc_free(tmp_ctx);
1449                                 return LDB_ERR_OPERATIONS_ERROR;
1450                         }
1451                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1452                                                   invocation_id, seq_num, seq_num, now, 0, false);
1453                         if (ret != LDB_SUCCESS) {
1454                                 talloc_free(tmp_ctx);
1455                                 return ret;
1456                         }
1457                         num_new_values++;
1458                 } else {
1459                         /* this is only allowed if the GUID was
1460                            previously deleted. */
1461                         const struct ldb_val *v;
1462                         v = ldb_dn_get_extended_component(p->dsdb_dn->dn, "DELETED");
1463                         if (v == NULL) {
1464                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1465                                                        el->name, GUID_string(tmp_ctx, p->guid));
1466                                 talloc_free(tmp_ctx);
1467                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1468                         }
1469                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1470                                                    invocation_id, seq_num, seq_num, now, 0, false);
1471                         if (ret != LDB_SUCCESS) {
1472                                 talloc_free(tmp_ctx);
1473                                 return ret;
1474                         }
1475                 }
1476
1477                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1478                 if (ret != LDB_SUCCESS) {
1479                         talloc_free(tmp_ctx);
1480                         return ret;
1481                 }
1482         }
1483
1484         /* add the new ones on to the end of the old values, constructing a new el->values */
1485         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1486                                     struct ldb_val,
1487                                     old_num_values+num_new_values);
1488         if (el->values == NULL) {
1489                 ldb_module_oom(module);
1490                 return LDB_ERR_OPERATIONS_ERROR;
1491         }
1492
1493         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1494         el->num_values = old_num_values + num_new_values;
1495
1496         talloc_steal(msg->elements, el->values);
1497         talloc_steal(el->values, new_values);
1498
1499         talloc_free(tmp_ctx);
1500
1501         /* we now tell the backend to replace all existing values
1502            with the one we have constructed */
1503         el->flags = LDB_FLAG_MOD_REPLACE;
1504
1505         return LDB_SUCCESS;
1506 }
1507
1508
1509 /*
1510   handle deleting all active linked attributes
1511  */
1512 static int replmd_modify_la_delete(struct ldb_module *module,
1513                                    struct dsdb_schema *schema,
1514                                    struct ldb_message *msg,
1515                                    struct ldb_message_element *el,
1516                                    struct ldb_message_element *old_el,
1517                                    const struct dsdb_attribute *schema_attr,
1518                                    uint64_t seq_num,
1519                                    time_t t,
1520                                    struct GUID *msg_guid)
1521 {
1522         int i;
1523         struct parsed_dn *dns, *old_dns;
1524         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1525         int ret;
1526         const struct GUID *invocation_id;
1527         struct ldb_context *ldb = ldb_module_get_ctx(module);
1528         NTTIME now;
1529
1530         unix_to_nt_time(&now, t);
1531
1532         /* check if there is nothing to delete */
1533         if ((!old_el || old_el->num_values == 0) &&
1534             el->num_values == 0) {
1535                 return LDB_SUCCESS;
1536         }
1537
1538         if (!old_el || old_el->num_values == 0) {
1539                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1540         }
1541
1542         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1543         if (ret != LDB_SUCCESS) {
1544                 talloc_free(tmp_ctx);
1545                 return ret;
1546         }
1547
1548         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1549         if (ret != LDB_SUCCESS) {
1550                 talloc_free(tmp_ctx);
1551                 return ret;
1552         }
1553
1554         invocation_id = samdb_ntds_invocation_id(ldb);
1555         if (!invocation_id) {
1556                 return LDB_ERR_OPERATIONS_ERROR;
1557         }
1558
1559         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, invocation_id);
1560         if (ret != LDB_SUCCESS) {
1561                 talloc_free(tmp_ctx);
1562                 return ret;
1563         }
1564
1565         el->values = NULL;
1566
1567         /* see if we are being asked to delete any links that
1568            don't exist or are already deleted */
1569         for (i=0; i<el->num_values; i++) {
1570                 struct parsed_dn *p = &dns[i];
1571                 struct parsed_dn *p2;
1572                 const struct ldb_val *v;
1573
1574                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid);
1575                 if (!p2) {
1576                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1577                                                el->name, GUID_string(tmp_ctx, p->guid));
1578                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1579                 }
1580                 v = ldb_dn_get_extended_component(p2->dsdb_dn->dn, "DELETED");
1581                 if (v) {
1582                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1583                                                el->name, GUID_string(tmp_ctx, p->guid));
1584                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1585                 }
1586         }
1587
1588         /* for each new value, see if it exists already with the same GUID
1589            if it is not already deleted and matches the delete list then delete it
1590         */
1591         for (i=0; i<old_el->num_values; i++) {
1592                 struct parsed_dn *p = &old_dns[i];
1593                 const struct ldb_val *v;
1594
1595                 if (dns && parsed_dn_find(dns, el->num_values, p->guid) == NULL) {
1596                         continue;
1597                 }
1598
1599                 v = ldb_dn_get_extended_component(p->dsdb_dn->dn, "DELETED");
1600                 if (v != NULL) continue;
1601
1602                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1603                                            invocation_id, seq_num, seq_num, now, 0, true);
1604                 if (ret != LDB_SUCCESS) {
1605                         talloc_free(tmp_ctx);
1606                         return ret;
1607                 }
1608
1609                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1610                 if (ret != LDB_SUCCESS) {
1611                         talloc_free(tmp_ctx);
1612                         return ret;
1613                 }
1614         }
1615
1616         el->values = talloc_steal(msg->elements, old_el->values);
1617         el->num_values = old_el->num_values;
1618
1619         talloc_free(tmp_ctx);
1620
1621         /* we now tell the backend to replace all existing values
1622            with the one we have constructed */
1623         el->flags = LDB_FLAG_MOD_REPLACE;
1624
1625         return LDB_SUCCESS;
1626 }
1627
1628 /*
1629   handle replacing a linked attribute
1630  */
1631 static int replmd_modify_la_replace(struct ldb_module *module,
1632                                     struct dsdb_schema *schema,
1633                                     struct ldb_message *msg,
1634                                     struct ldb_message_element *el,
1635                                     struct ldb_message_element *old_el,
1636                                     const struct dsdb_attribute *schema_attr,
1637                                     uint64_t seq_num,
1638                                     time_t t,
1639                                     struct GUID *msg_guid)
1640 {
1641         int i;
1642         struct parsed_dn *dns, *old_dns;
1643         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1644         int ret;
1645         const struct GUID *invocation_id;
1646         struct ldb_context *ldb = ldb_module_get_ctx(module);
1647         struct ldb_val *new_values = NULL;
1648         uint32_t num_new_values = 0;
1649         unsigned old_num_values = old_el?old_el->num_values:0;
1650         NTTIME now;
1651
1652         unix_to_nt_time(&now, t);
1653
1654         /* check if there is nothing to replace */
1655         if ((!old_el || old_el->num_values == 0) &&
1656             el->num_values == 0) {
1657                 return LDB_SUCCESS;
1658         }
1659
1660         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1661         if (ret != LDB_SUCCESS) {
1662                 talloc_free(tmp_ctx);
1663                 return ret;
1664         }
1665
1666         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1667         if (ret != LDB_SUCCESS) {
1668                 talloc_free(tmp_ctx);
1669                 return ret;
1670         }
1671
1672         invocation_id = samdb_ntds_invocation_id(ldb);
1673         if (!invocation_id) {
1674                 return LDB_ERR_OPERATIONS_ERROR;
1675         }
1676
1677         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1678         if (ret != LDB_SUCCESS) {
1679                 talloc_free(tmp_ctx);
1680                 return ret;
1681         }
1682
1683         /* mark all the old ones as deleted */
1684         for (i=0; i<old_num_values; i++) {
1685                 struct parsed_dn *old_p = &old_dns[i];
1686                 struct parsed_dn *p;
1687                 const struct ldb_val *v;
1688
1689                 v = ldb_dn_get_extended_component(old_p->dsdb_dn->dn, "DELETED");
1690                 if (v) continue;
1691
1692                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1693                 if (ret != LDB_SUCCESS) {
1694                         talloc_free(tmp_ctx);
1695                         return ret;
1696                 }
1697
1698                 p = parsed_dn_find(dns, el->num_values, old_p->guid);
1699                 if (p) {
1700                         /* we don't delete it if we are re-adding it */
1701                         continue;
1702                 }
1703
1704                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1705                                            invocation_id, seq_num, seq_num, now, 0, true);
1706                 if (ret != LDB_SUCCESS) {
1707                         talloc_free(tmp_ctx);
1708                         return ret;
1709                 }
1710         }
1711
1712         /* for each new value, either update its meta-data, or add it
1713          * to old_el
1714         */
1715         for (i=0; i<el->num_values; i++) {
1716                 struct parsed_dn *p = &dns[i], *old_p;
1717
1718                 if (old_dns &&
1719                     (old_p = parsed_dn_find(old_dns,
1720                                             old_num_values, p->guid)) != NULL) {
1721                         /* update in place */
1722                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1723                                                    old_p->dsdb_dn, invocation_id,
1724                                                    seq_num, seq_num, now, 0, false);
1725                         if (ret != LDB_SUCCESS) {
1726                                 talloc_free(tmp_ctx);
1727                                 return ret;
1728                         }
1729                 } else {
1730                         /* add a new one */
1731                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1732                                                     num_new_values+1);
1733                         if (new_values == NULL) {
1734                                 ldb_module_oom(module);
1735                                 talloc_free(tmp_ctx);
1736                                 return LDB_ERR_OPERATIONS_ERROR;
1737                         }
1738                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1739                                                   invocation_id, seq_num, seq_num, now, 0, false);
1740                         if (ret != LDB_SUCCESS) {
1741                                 talloc_free(tmp_ctx);
1742                                 return ret;
1743                         }
1744                         num_new_values++;
1745                 }
1746
1747                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1748                 if (ret != LDB_SUCCESS) {
1749                         talloc_free(tmp_ctx);
1750                         return ret;
1751                 }
1752         }
1753
1754         /* add the new values to the end of old_el */
1755         if (num_new_values != 0) {
1756                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1757                                             struct ldb_val, old_num_values+num_new_values);
1758                 if (el->values == NULL) {
1759                         ldb_module_oom(module);
1760                         return LDB_ERR_OPERATIONS_ERROR;
1761                 }
1762                 memcpy(&el->values[old_num_values], &new_values[0],
1763                        sizeof(struct ldb_val)*num_new_values);
1764                 el->num_values = old_num_values + num_new_values;
1765                 talloc_steal(msg->elements, new_values);
1766         } else {
1767                 el->values = old_el->values;
1768                 el->num_values = old_el->num_values;
1769                 talloc_steal(msg->elements, el->values);
1770         }
1771
1772         talloc_free(tmp_ctx);
1773
1774         /* we now tell the backend to replace all existing values
1775            with the one we have constructed */
1776         el->flags = LDB_FLAG_MOD_REPLACE;
1777
1778         return LDB_SUCCESS;
1779 }
1780
1781
1782 /*
1783   handle linked attributes in modify requests
1784  */
1785 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1786                                                struct ldb_message *msg,
1787                                                uint64_t seq_num, time_t t)
1788 {
1789         struct ldb_result *res;
1790         int ret, i;
1791         struct ldb_context *ldb = ldb_module_get_ctx(module);
1792         struct ldb_message *old_msg;
1793         struct dsdb_schema *schema = dsdb_get_schema(ldb);
1794         struct GUID old_guid;
1795
1796         if (seq_num == 0) {
1797                 /* there the replmd_update_rpmd code has already
1798                  * checked and saw that there are no linked
1799                  * attributes */
1800                 return LDB_SUCCESS;
1801         }
1802
1803 #if !W2K3_LINKED_ATTRIBUTES
1804         return LDB_SUCCESS;
1805 #endif
1806
1807         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1808                 /* don't do anything special for linked attributes */
1809                 return LDB_SUCCESS;
1810         }
1811
1812         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1813                                     DSDB_SEARCH_SHOW_DELETED |
1814                                     DSDB_SEARCH_REVEAL_INTERNALS |
1815                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1816         if (ret != LDB_SUCCESS) {
1817                 return ret;
1818         }
1819         old_msg = res->msgs[0];
1820
1821         old_guid = samdb_result_guid(old_msg, "objectGUID");
1822
1823         for (i=0; i<msg->num_elements; i++) {
1824                 struct ldb_message_element *el = &msg->elements[i];
1825                 struct ldb_message_element *old_el, *new_el;
1826                 const struct dsdb_attribute *schema_attr
1827                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1828                 if (!schema_attr) {
1829                         ldb_asprintf_errstring(ldb,
1830                                                "attribute %s is not a valid attribute in schema", el->name);
1831                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
1832                 }
1833                 if (schema_attr->linkID == 0) {
1834                         continue;
1835                 }
1836                 if ((schema_attr->linkID & 1) == 1) {
1837                         /* Odd is for the target.  Illegal to modify */
1838                         ldb_asprintf_errstring(ldb,
1839                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
1840                         return LDB_ERR_UNWILLING_TO_PERFORM;
1841                 }
1842                 old_el = ldb_msg_find_element(old_msg, el->name);
1843                 switch (el->flags & LDB_FLAG_MOD_MASK) {
1844                 case LDB_FLAG_MOD_REPLACE:
1845                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1846                         break;
1847                 case LDB_FLAG_MOD_DELETE:
1848                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1849                         break;
1850                 case LDB_FLAG_MOD_ADD:
1851                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1852                         break;
1853                 default:
1854                         ldb_asprintf_errstring(ldb,
1855                                                "invalid flags 0x%x for %s linked attribute",
1856                                                el->flags, el->name);
1857                         return LDB_ERR_UNWILLING_TO_PERFORM;
1858                 }
1859                 if (ret != LDB_SUCCESS) {
1860                         return ret;
1861                 }
1862                 if (old_el) {
1863                         ldb_msg_remove_attr(old_msg, el->name);
1864                 }
1865                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
1866                 new_el->num_values = el->num_values;
1867                 new_el->values = el->values;
1868
1869                 /* TODO: this relises a bit too heavily on the exact
1870                    behaviour of ldb_msg_find_element and
1871                    ldb_msg_remove_element */
1872                 old_el = ldb_msg_find_element(msg, el->name);
1873                 if (old_el != el) {
1874                         ldb_msg_remove_element(msg, old_el);
1875                         i--;
1876                 }
1877         }
1878
1879         talloc_free(res);
1880         return ret;
1881 }
1882
1883
1884
1885 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
1886 {
1887         struct ldb_context *ldb;
1888         struct replmd_replicated_request *ac;
1889         struct ldb_request *down_req;
1890         struct ldb_message *msg;
1891         time_t t = time(NULL);
1892         int ret;
1893
1894         /* do not manipulate our control entries */
1895         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1896                 return ldb_next_request(module, req);
1897         }
1898
1899         ldb = ldb_module_get_ctx(module);
1900
1901         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
1902
1903         ac = replmd_ctx_init(module, req);
1904         if (!ac) {
1905                 return LDB_ERR_OPERATIONS_ERROR;
1906         }
1907
1908         /* we have to copy the message as the caller might have it as a const */
1909         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
1910         if (msg == NULL) {
1911                 ldb_oom(ldb);
1912                 talloc_free(ac);
1913                 return LDB_ERR_OPERATIONS_ERROR;
1914         }
1915
1916         ret = replmd_update_rpmd(module, ac->schema, msg, &ac->seq_num, t);
1917         if (ret != LDB_SUCCESS) {
1918                 talloc_free(ac);
1919                 return ret;
1920         }
1921
1922         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
1923         if (ret != LDB_SUCCESS) {
1924                 talloc_free(ac);
1925                 return ret;
1926         }
1927
1928         /* TODO:
1929          * - replace the old object with the newly constructed one
1930          */
1931
1932         ret = ldb_build_mod_req(&down_req, ldb, ac,
1933                                 msg,
1934                                 req->controls,
1935                                 ac, replmd_op_callback,
1936                                 req);
1937         if (ret != LDB_SUCCESS) {
1938                 talloc_free(ac);
1939                 return ret;
1940         }
1941         talloc_steal(down_req, msg);
1942
1943         /* we only change whenChanged and uSNChanged if the seq_num
1944            has changed */
1945         if (ac->seq_num != 0) {
1946                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
1947                         talloc_free(ac);
1948                         return ret;
1949                 }
1950
1951                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
1952                         talloc_free(ac);
1953                         return ret;
1954                 }
1955         }
1956
1957         /* go on with the call chain */
1958         return ldb_next_request(module, down_req);
1959 }
1960
1961 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
1962
1963 /*
1964   handle a rename request
1965
1966   On a rename we need to do an extra ldb_modify which sets the
1967   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
1968  */
1969 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
1970 {
1971         struct ldb_context *ldb;
1972         struct replmd_replicated_request *ac;
1973         int ret;
1974         struct ldb_request *down_req;
1975
1976         /* do not manipulate our control entries */
1977         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1978                 return ldb_next_request(module, req);
1979         }
1980
1981         ldb = ldb_module_get_ctx(module);
1982
1983         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
1984
1985         ac = replmd_ctx_init(module, req);
1986         if (!ac) {
1987                 return LDB_ERR_OPERATIONS_ERROR;
1988         }
1989         ret = ldb_build_rename_req(&down_req, ldb, ac,
1990                                    ac->req->op.rename.olddn,
1991                                    ac->req->op.rename.newdn,
1992                                    ac->req->controls,
1993                                    ac, replmd_rename_callback,
1994                                    ac->req);
1995
1996         if (ret != LDB_SUCCESS) {
1997                 talloc_free(ac);
1998                 return ret;
1999         }
2000
2001         /* go on with the call chain */
2002         return ldb_next_request(module, down_req);
2003 }
2004
2005 /* After the rename is compleated, update the whenchanged etc */
2006 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2007 {
2008         struct ldb_context *ldb;
2009         struct replmd_replicated_request *ac;
2010         struct ldb_request *down_req;
2011         struct ldb_message *msg;
2012         time_t t = time(NULL);
2013         int ret;
2014
2015         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2016         ldb = ldb_module_get_ctx(ac->module);
2017
2018         if (ares->error != LDB_SUCCESS) {
2019                 return ldb_module_done(ac->req, ares->controls,
2020                                         ares->response, ares->error);
2021         }
2022
2023         if (ares->type != LDB_REPLY_DONE) {
2024                 ldb_set_errstring(ldb,
2025                                   "invalid ldb_reply_type in callback");
2026                 talloc_free(ares);
2027                 return ldb_module_done(ac->req, NULL, NULL,
2028                                         LDB_ERR_OPERATIONS_ERROR);
2029         }
2030
2031         /* Get a sequence number from the backend */
2032         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2033         if (ret != LDB_SUCCESS) {
2034                 return ret;
2035         }
2036
2037         /* TODO:
2038          * - replace the old object with the newly constructed one
2039          */
2040
2041         msg = ldb_msg_new(ac);
2042         if (msg == NULL) {
2043                 ldb_oom(ldb);
2044                 return LDB_ERR_OPERATIONS_ERROR;
2045         }
2046
2047         msg->dn = ac->req->op.rename.newdn;
2048
2049         ret = ldb_build_mod_req(&down_req, ldb, ac,
2050                                 msg,
2051                                 req->controls,
2052                                 ac, replmd_op_callback,
2053                                 req);
2054
2055         if (ret != LDB_SUCCESS) {
2056                 talloc_free(ac);
2057                 return ret;
2058         }
2059         talloc_steal(down_req, msg);
2060
2061         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2062                 talloc_free(ac);
2063                 return ret;
2064         }
2065
2066         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2067                 talloc_free(ac);
2068                 return ret;
2069         }
2070
2071         /* go on with the call chain - do the modify after the rename */
2072         return ldb_next_request(ac->module, down_req);
2073 }
2074
2075 /* remove forwards and backlinks as needed when an object
2076    is deleted */
2077 static int replmd_delete_remove_link(struct ldb_module *module,
2078                                      struct dsdb_schema *schema,
2079                                      struct ldb_dn *dn,
2080                                      struct ldb_message_element *el,
2081                                      const struct dsdb_attribute *sa)
2082 {
2083         int i;
2084         TALLOC_CTX *tmp_ctx = talloc_new(module);
2085         struct ldb_context *ldb = ldb_module_get_ctx(module);
2086
2087         for (i=0; i<el->num_values; i++) {
2088                 struct dsdb_dn *dsdb_dn;
2089                 NTSTATUS status;
2090                 int ret;
2091                 struct GUID guid2;
2092                 struct ldb_message *msg;
2093                 const struct dsdb_attribute *target_attr;
2094                 struct ldb_message_element *el2;
2095                 struct ldb_val dn_val;
2096
2097                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2098                         continue;
2099                 }
2100
2101                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2102                 if (!dsdb_dn) {
2103                         talloc_free(tmp_ctx);
2104                         return LDB_ERR_OPERATIONS_ERROR;
2105                 }
2106
2107                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2108                 if (!NT_STATUS_IS_OK(status)) {
2109                         talloc_free(tmp_ctx);
2110                         return LDB_ERR_OPERATIONS_ERROR;
2111                 }
2112
2113                 /* remove the link */
2114                 msg = ldb_msg_new(tmp_ctx);
2115                 if (!msg) {
2116                         ldb_module_oom(module);
2117                         talloc_free(tmp_ctx);
2118                         return LDB_ERR_OPERATIONS_ERROR;
2119                 }
2120
2121
2122                 msg->dn = dsdb_dn->dn;
2123
2124                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2125                 if (target_attr == NULL) {
2126                         continue;
2127                 }
2128
2129                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2130                 if (ret != LDB_SUCCESS) {
2131                         ldb_module_oom(module);
2132                         talloc_free(tmp_ctx);
2133                         return LDB_ERR_OPERATIONS_ERROR;
2134                 }
2135                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2136                 el2->values = &dn_val;
2137                 el2->num_values = 1;
2138
2139                 ret = dsdb_module_modify(module, msg, 0);
2140                 if (ret != LDB_SUCCESS) {
2141                         talloc_free(tmp_ctx);
2142                         return ret;
2143                 }
2144         }
2145         talloc_free(tmp_ctx);
2146         return LDB_SUCCESS;
2147 }
2148
2149
2150 /*
2151   handle update of replication meta data for deletion of objects
2152
2153   This also handles the mapping of delete to a rename operation
2154   to allow deletes to be replicated.
2155  */
2156 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2157 {
2158         int ret = LDB_ERR_OTHER;
2159         bool retb;
2160         struct ldb_dn *old_dn, *new_dn;
2161         const char *rdn_name;
2162         const struct ldb_val *rdn_value, *new_rdn_value;
2163         struct GUID guid;
2164         struct ldb_context *ldb = ldb_module_get_ctx(module);
2165         struct dsdb_schema *schema = dsdb_get_schema(ldb);
2166         struct ldb_message *msg, *old_msg;
2167         struct ldb_message_element *el;
2168         TALLOC_CTX *tmp_ctx;
2169         struct ldb_result *res, *parent_res;
2170         const char *preserved_attrs[] = {
2171                 /* yes, this really is a hard coded list. See MS-ADTS
2172                    section 3.1.1.5.5.1.1 */
2173                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2174                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2175                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2176                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2177                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2178                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2179                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreate",
2180                 NULL};
2181         uint32_t el_count = 0;
2182         int i;
2183
2184         tmp_ctx = talloc_new(ldb);
2185
2186         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2187
2188         /* we need the complete msg off disk, so we can work out which
2189            attributes need to be removed */
2190         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2191                                     DSDB_SEARCH_SHOW_DELETED |
2192                                     DSDB_SEARCH_REVEAL_INTERNALS |
2193                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2194         if (ret != LDB_SUCCESS) {
2195                 talloc_free(tmp_ctx);
2196                 return ret;
2197         }
2198         old_msg = res->msgs[0];
2199
2200         /* work out where we will be renaming this object to */
2201         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2202         if (ret != LDB_SUCCESS) {
2203                 /* this is probably an attempted delete on a partition
2204                  * that doesn't allow delete operations, such as the
2205                  * schema partition */
2206                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2207                                        ldb_dn_get_linearized(old_dn));
2208                 talloc_free(tmp_ctx);
2209                 return LDB_ERR_UNWILLING_TO_PERFORM;
2210         }
2211
2212         rdn_name = ldb_dn_get_rdn_name(old_dn);
2213         rdn_value = ldb_dn_get_rdn_val(old_dn);
2214
2215         /* get the objects GUID from the search we just did */
2216         guid = samdb_result_guid(old_msg, "objectGUID");
2217
2218         /* Add a formatted child */
2219         retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2220                                     rdn_name,
2221                                     rdn_value->data,
2222                                     GUID_string(tmp_ctx, &guid));
2223         if (!retb) {
2224                 DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2225                                 ldb_dn_get_linearized(new_dn)));
2226                 talloc_free(tmp_ctx);
2227                 return LDB_ERR_OPERATIONS_ERROR;
2228         }
2229
2230         /*
2231           now we need to modify the object in the following ways:
2232
2233           - add isDeleted=TRUE
2234           - update rDN and name, with new rDN
2235           - remove linked attributes
2236           - remove objectCategory and sAMAccountType
2237           - remove attribs not on the preserved list
2238              - preserved if in above list, or is rDN
2239           - remove all linked attribs from this object
2240           - remove all links from other objects to this object
2241           - add lastKnownParent
2242           - update replPropertyMetaData?
2243
2244           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2245          */
2246
2247         msg = ldb_msg_new(tmp_ctx);
2248         if (msg == NULL) {
2249                 ldb_module_oom(module);
2250                 talloc_free(tmp_ctx);
2251                 return LDB_ERR_OPERATIONS_ERROR;
2252         }
2253
2254         msg->dn = old_dn;
2255
2256         ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2257         if (ret != LDB_SUCCESS) {
2258                 DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2259                 ldb_module_oom(module);
2260                 talloc_free(tmp_ctx);
2261                 return ret;
2262         }
2263         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2264
2265         /* we need the storage form of the parent GUID */
2266         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2267                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2268                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2269                                     DSDB_SEARCH_REVEAL_INTERNALS);
2270         if (ret != LDB_SUCCESS) {
2271                 talloc_free(tmp_ctx);
2272                 return ret;
2273         }
2274
2275         ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2276                                        ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2277         if (ret != LDB_SUCCESS) {
2278                 DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2279                 ldb_module_oom(module);
2280                 talloc_free(tmp_ctx);
2281                 return ret;
2282         }
2283         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2284
2285         /* work out which of the old attributes we will be removing */
2286         for (i=0; i<old_msg->num_elements; i++) {
2287                 const struct dsdb_attribute *sa;
2288                 el = &old_msg->elements[i];
2289                 sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2290                 if (!sa) {
2291                         talloc_free(tmp_ctx);
2292                         return LDB_ERR_OPERATIONS_ERROR;
2293                 }
2294                 if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2295                         /* don't remove the rDN */
2296                         continue;
2297                 }
2298
2299                 if (sa->linkID) {
2300                         ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2301                         if (ret != LDB_SUCCESS) {
2302                                 talloc_free(tmp_ctx);
2303                                 return LDB_ERR_OPERATIONS_ERROR;
2304                         }
2305                 }
2306
2307                 if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2308                         continue;
2309                 }
2310
2311                 ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2312                 if (ret != LDB_SUCCESS) {
2313                         talloc_free(tmp_ctx);
2314                         ldb_module_oom(module);
2315                         return ret;
2316                 }
2317         }
2318
2319         /* work out what the new rdn value is, for updating the
2320            rDN and name fields */
2321         new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2322         ret = ldb_msg_add_value(msg, rdn_name, new_rdn_value, &el);
2323         if (ret != LDB_SUCCESS) {
2324                 talloc_free(tmp_ctx);
2325                 return ret;
2326         }
2327         el->flags = LDB_FLAG_MOD_REPLACE;
2328
2329         el = ldb_msg_find_element(old_msg, "name");
2330         if (el) {
2331                 ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2332                 if (ret != LDB_SUCCESS) {
2333                         talloc_free(tmp_ctx);
2334                         return ret;
2335                 }
2336                 el->flags = LDB_FLAG_MOD_REPLACE;
2337         }
2338
2339         ret = dsdb_module_modify(module, msg, 0);
2340         if (ret != LDB_SUCCESS){
2341                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2342                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2343                 talloc_free(tmp_ctx);
2344                 return ret;
2345         }
2346
2347         /* now rename onto the new DN */
2348         ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2349         if (ret != LDB_SUCCESS){
2350                 DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2351                          ldb_dn_get_linearized(old_dn),
2352                          ldb_dn_get_linearized(new_dn),
2353                          ldb_errstring(ldb)));
2354                 talloc_free(tmp_ctx);
2355                 return ret;
2356         }
2357
2358         talloc_free(tmp_ctx);
2359
2360         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2361 }
2362
2363
2364
2365 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2366 {
2367         return ret;
2368 }
2369
2370 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2371 {
2372         int ret = LDB_ERR_OTHER;
2373         /* TODO: do some error mapping */
2374         return ret;
2375 }
2376
2377 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2378 {
2379         struct ldb_context *ldb;
2380         struct ldb_request *change_req;
2381         enum ndr_err_code ndr_err;
2382         struct ldb_message *msg;
2383         struct replPropertyMetaDataBlob *md;
2384         struct ldb_val md_value;
2385         uint32_t i;
2386         int ret;
2387
2388         /*
2389          * TODO: check if the parent object exist
2390          */
2391
2392         /*
2393          * TODO: handle the conflict case where an object with the
2394          *       same name exist
2395          */
2396
2397         ldb = ldb_module_get_ctx(ar->module);
2398         msg = ar->objs->objects[ar->index_current].msg;
2399         md = ar->objs->objects[ar->index_current].meta_data;
2400
2401         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2402         if (ret != LDB_SUCCESS) {
2403                 return replmd_replicated_request_error(ar, ret);
2404         }
2405
2406         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2407         if (ret != LDB_SUCCESS) {
2408                 return replmd_replicated_request_error(ar, ret);
2409         }
2410
2411         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2412         if (ret != LDB_SUCCESS) {
2413                 return replmd_replicated_request_error(ar, ret);
2414         }
2415
2416         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2417         if (ret != LDB_SUCCESS) {
2418                 return replmd_replicated_request_error(ar, ret);
2419         }
2420
2421         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2422         if (ret != LDB_SUCCESS) {
2423                 return replmd_replicated_request_error(ar, ret);
2424         }
2425
2426         /* remove any message elements that have zero values */
2427         for (i=0; i<msg->num_elements; i++) {
2428                 struct ldb_message_element *el = &msg->elements[i];
2429
2430                 if (el->num_values == 0) {
2431                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2432                                  el->name));
2433                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2434                         msg->num_elements--;
2435                         i--;
2436                         continue;
2437                 }
2438         }
2439
2440         /*
2441          * the meta data array is already sorted by the caller
2442          */
2443         for (i=0; i < md->ctr.ctr1.count; i++) {
2444                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2445         }
2446         ndr_err = ndr_push_struct_blob(&md_value, msg,
2447                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2448                                        md,
2449                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2450         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2451                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2452                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2453         }
2454         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2455         if (ret != LDB_SUCCESS) {
2456                 return replmd_replicated_request_error(ar, ret);
2457         }
2458
2459         replmd_ldb_message_sort(msg, ar->schema);
2460
2461         if (DEBUGLVL(4)) {
2462                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2463                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2464                 talloc_free(s);
2465         }
2466
2467         ret = ldb_build_add_req(&change_req,
2468                                 ldb,
2469                                 ar,
2470                                 msg,
2471                                 ar->controls,
2472                                 ar,
2473                                 replmd_op_callback,
2474                                 ar->req);
2475         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2476
2477         return ldb_next_request(ar->module, change_req);
2478 }
2479
2480 /*
2481    return true if an update is newer than an existing entry
2482    see section 5.11 of MS-ADTS
2483 */
2484 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2485                                    const struct GUID *update_invocation_id,
2486                                    uint32_t current_version,
2487                                    uint32_t update_version,
2488                                    NTTIME current_change_time,
2489                                    NTTIME update_change_time)
2490 {
2491         if (update_version != current_version) {
2492                 return update_version > current_version;
2493         }
2494         if (update_change_time > current_change_time) {
2495                 return true;
2496         }
2497         if (update_change_time == current_change_time) {
2498                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2499         }
2500         return false;
2501 }
2502
2503 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2504                                                   struct replPropertyMetaData1 *new_m)
2505 {
2506         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2507                                       &new_m->originating_invocation_id,
2508                                       cur_m->version,
2509                                       new_m->version,
2510                                       cur_m->originating_change_time,
2511                                       new_m->originating_change_time);
2512 }
2513
2514 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2515 {
2516         struct ldb_context *ldb;
2517         struct ldb_request *change_req;
2518         enum ndr_err_code ndr_err;
2519         struct ldb_message *msg;
2520         struct replPropertyMetaDataBlob *rmd;
2521         struct replPropertyMetaDataBlob omd;
2522         const struct ldb_val *omd_value;
2523         struct replPropertyMetaDataBlob nmd;
2524         struct ldb_val nmd_value;
2525         uint32_t i,j,ni=0;
2526         uint32_t removed_attrs = 0;
2527         int ret;
2528
2529         ldb = ldb_module_get_ctx(ar->module);
2530         msg = ar->objs->objects[ar->index_current].msg;
2531         rmd = ar->objs->objects[ar->index_current].meta_data;
2532         ZERO_STRUCT(omd);
2533         omd.version = 1;
2534
2535         /*
2536          * TODO: check repl data is correct after a rename
2537          */
2538         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2539                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2540                           ldb_dn_get_linearized(ar->search_msg->dn),
2541                           ldb_dn_get_linearized(msg->dn));
2542                 /* we can't use dsdb_module_rename() here as we need
2543                    the rename call to be intercepted by this module, to
2544                    allow it to process linked attribute changes */
2545                 if (ldb_rename(ldb, ar->search_msg->dn, msg->dn) != LDB_SUCCESS) {
2546                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2547                                   ldb_dn_get_linearized(ar->search_msg->dn),
2548                                   ldb_dn_get_linearized(msg->dn),
2549                                   ldb_errstring(ldb));
2550                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2551                 }
2552         }
2553
2554         /* find existing meta data */
2555         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2556         if (omd_value) {
2557                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
2558                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
2559                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2560                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2561                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2562                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2563                 }
2564
2565                 if (omd.version != 1) {
2566                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2567                 }
2568         }
2569
2570         ZERO_STRUCT(nmd);
2571         nmd.version = 1;
2572         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2573         nmd.ctr.ctr1.array = talloc_array(ar,
2574                                           struct replPropertyMetaData1,
2575                                           nmd.ctr.ctr1.count);
2576         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2577
2578         /* first copy the old meta data */
2579         for (i=0; i < omd.ctr.ctr1.count; i++) {
2580                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2581                 ni++;
2582         }
2583
2584         /* now merge in the new meta data */
2585         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2586                 bool found = false;
2587
2588                 for (j=0; j < ni; j++) {
2589                         bool cmp;
2590
2591                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2592                                 continue;
2593                         }
2594
2595                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2596                                                                     &rmd->ctr.ctr1.array[i]);
2597                         if (cmp) {
2598                                 /* replace the entry */
2599                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2600                                 found = true;
2601                                 break;
2602                         }
2603
2604                         DEBUG(1,("Discarding older DRS attribute update to %s on %s from %s\n",
2605                                  msg->elements[i-removed_attrs].name,
2606                                  ldb_dn_get_linearized(msg->dn),
2607                                  GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2608
2609                         /* we don't want to apply this change so remove the attribute */
2610                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2611                         removed_attrs++;
2612
2613                         found = true;
2614                         break;
2615                 }
2616
2617                 if (found) continue;
2618
2619                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2620                 ni++;
2621         }
2622
2623         /*
2624          * finally correct the size of the meta_data array
2625          */
2626         nmd.ctr.ctr1.count = ni;
2627
2628         /*
2629          * the rdn attribute (the alias for the name attribute),
2630          * 'cn' for most objects is the last entry in the meta data array
2631          * we have stored
2632          *
2633          * sort the new meta data array
2634          */
2635         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2636         if (ret != LDB_SUCCESS) {
2637                 return ret;
2638         }
2639
2640         /*
2641          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2642          */
2643         if (msg->num_elements == 0) {
2644                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2645                           ar->index_current);
2646
2647                 ar->index_current++;
2648                 return replmd_replicated_apply_next(ar);
2649         }
2650
2651         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2652                   ar->index_current, msg->num_elements);
2653
2654         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2655         if (ret != LDB_SUCCESS) {
2656                 return replmd_replicated_request_error(ar, ret);
2657         }
2658
2659         for (i=0; i<ni; i++) {
2660                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2661         }
2662
2663         /* create the meta data value */
2664         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
2665                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2666                                        &nmd,
2667                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2668         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2669                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2670                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2671         }
2672
2673         /*
2674          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2675          * and replPopertyMetaData attributes
2676          */
2677         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2678         if (ret != LDB_SUCCESS) {
2679                 return replmd_replicated_request_error(ar, ret);
2680         }
2681         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2682         if (ret != LDB_SUCCESS) {
2683                 return replmd_replicated_request_error(ar, ret);
2684         }
2685         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2686         if (ret != LDB_SUCCESS) {
2687                 return replmd_replicated_request_error(ar, ret);
2688         }
2689
2690         replmd_ldb_message_sort(msg, ar->schema);
2691
2692         /* we want to replace the old values */
2693         for (i=0; i < msg->num_elements; i++) {
2694                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
2695         }
2696
2697         if (DEBUGLVL(4)) {
2698                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
2699                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
2700                 talloc_free(s);
2701         }
2702
2703         ret = ldb_build_mod_req(&change_req,
2704                                 ldb,
2705                                 ar,
2706                                 msg,
2707                                 ar->controls,
2708                                 ar,
2709                                 replmd_op_callback,
2710                                 ar->req);
2711         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2712
2713         return ldb_next_request(ar->module, change_req);
2714 }
2715
2716 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
2717                                                    struct ldb_reply *ares)
2718 {
2719         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2720                                                struct replmd_replicated_request);
2721         int ret;
2722
2723         if (!ares) {
2724                 return ldb_module_done(ar->req, NULL, NULL,
2725                                         LDB_ERR_OPERATIONS_ERROR);
2726         }
2727         if (ares->error != LDB_SUCCESS &&
2728             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
2729                 return ldb_module_done(ar->req, ares->controls,
2730                                         ares->response, ares->error);
2731         }
2732
2733         switch (ares->type) {
2734         case LDB_REPLY_ENTRY:
2735                 ar->search_msg = talloc_steal(ar, ares->message);
2736                 break;
2737
2738         case LDB_REPLY_REFERRAL:
2739                 /* we ignore referrals */
2740                 break;
2741
2742         case LDB_REPLY_DONE:
2743                 if (ar->search_msg != NULL) {
2744                         ret = replmd_replicated_apply_merge(ar);
2745                 } else {
2746                         ret = replmd_replicated_apply_add(ar);
2747                 }
2748                 if (ret != LDB_SUCCESS) {
2749                         return ldb_module_done(ar->req, NULL, NULL, ret);
2750                 }
2751         }
2752
2753         talloc_free(ares);
2754         return LDB_SUCCESS;
2755 }
2756
2757 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
2758
2759 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
2760 {
2761         struct ldb_context *ldb;
2762         int ret;
2763         char *tmp_str;
2764         char *filter;
2765         struct ldb_request *search_req;
2766         struct ldb_search_options_control *options;
2767
2768         if (ar->index_current >= ar->objs->num_objects) {
2769                 /* done with it, go to next stage */
2770                 return replmd_replicated_uptodate_vector(ar);
2771         }
2772
2773         ldb = ldb_module_get_ctx(ar->module);
2774         ar->search_msg = NULL;
2775
2776         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
2777         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2778
2779         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
2780         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2781         talloc_free(tmp_str);
2782
2783         ret = ldb_build_search_req(&search_req,
2784                                    ldb,
2785                                    ar,
2786                                    NULL,
2787                                    LDB_SCOPE_SUBTREE,
2788                                    filter,
2789                                    NULL,
2790                                    NULL,
2791                                    ar,
2792                                    replmd_replicated_apply_search_callback,
2793                                    ar->req);
2794
2795         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
2796         if (ret != LDB_SUCCESS) {
2797                 return ret;
2798         }
2799
2800         /* we need to cope with cross-partition links, so search for
2801            the GUID over all partitions */
2802         options = talloc(search_req, struct ldb_search_options_control);
2803         if (options == NULL) {
2804                 DEBUG(0, (__location__ ": out of memory\n"));
2805                 return LDB_ERR_OPERATIONS_ERROR;
2806         }
2807         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
2808
2809         ret = ldb_request_add_control(search_req,
2810                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
2811                                       true, options);
2812         if (ret != LDB_SUCCESS) {
2813                 return ret;
2814         }
2815
2816         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2817
2818         return ldb_next_request(ar->module, search_req);
2819 }
2820
2821 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
2822                                                       struct ldb_reply *ares)
2823 {
2824         struct ldb_context *ldb;
2825         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2826                                                struct replmd_replicated_request);
2827         ldb = ldb_module_get_ctx(ar->module);
2828
2829         if (!ares) {
2830                 return ldb_module_done(ar->req, NULL, NULL,
2831                                         LDB_ERR_OPERATIONS_ERROR);
2832         }
2833         if (ares->error != LDB_SUCCESS) {
2834                 return ldb_module_done(ar->req, ares->controls,
2835                                         ares->response, ares->error);
2836         }
2837
2838         if (ares->type != LDB_REPLY_DONE) {
2839                 ldb_set_errstring(ldb, "Invalid reply type\n!");
2840                 return ldb_module_done(ar->req, NULL, NULL,
2841                                         LDB_ERR_OPERATIONS_ERROR);
2842         }
2843
2844         talloc_free(ares);
2845
2846         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
2847 }
2848
2849 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
2850 {
2851         struct ldb_context *ldb;
2852         struct ldb_request *change_req;
2853         enum ndr_err_code ndr_err;
2854         struct ldb_message *msg;
2855         struct replUpToDateVectorBlob ouv;
2856         const struct ldb_val *ouv_value;
2857         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
2858         struct replUpToDateVectorBlob nuv;
2859         struct ldb_val nuv_value;
2860         struct ldb_message_element *nuv_el = NULL;
2861         const struct GUID *our_invocation_id;
2862         struct ldb_message_element *orf_el = NULL;
2863         struct repsFromToBlob nrf;
2864         struct ldb_val *nrf_value = NULL;
2865         struct ldb_message_element *nrf_el = NULL;
2866         uint32_t i,j,ni=0;
2867         bool found = false;
2868         time_t t = time(NULL);
2869         NTTIME now;
2870         int ret;
2871
2872         ldb = ldb_module_get_ctx(ar->module);
2873         ruv = ar->objs->uptodateness_vector;
2874         ZERO_STRUCT(ouv);
2875         ouv.version = 2;
2876         ZERO_STRUCT(nuv);
2877         nuv.version = 2;
2878
2879         unix_to_nt_time(&now, t);
2880
2881         /*
2882          * first create the new replUpToDateVector
2883          */
2884         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
2885         if (ouv_value) {
2886                 ndr_err = ndr_pull_struct_blob(ouv_value, ar,
2887                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
2888                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
2889                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2890                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2891                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2892                 }
2893
2894                 if (ouv.version != 2) {
2895                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2896                 }
2897         }
2898
2899         /*
2900          * the new uptodateness vector will at least
2901          * contain 1 entry, one for the source_dsa
2902          *
2903          * plus optional values from our old vector and the one from the source_dsa
2904          */
2905         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
2906         if (ruv) nuv.ctr.ctr2.count += ruv->count;
2907         nuv.ctr.ctr2.cursors = talloc_array(ar,
2908                                             struct drsuapi_DsReplicaCursor2,
2909                                             nuv.ctr.ctr2.count);
2910         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2911
2912         /* first copy the old vector */
2913         for (i=0; i < ouv.ctr.ctr2.count; i++) {
2914                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
2915                 ni++;
2916         }
2917
2918         /* get our invocation_id if we have one already attached to the ldb */
2919         our_invocation_id = samdb_ntds_invocation_id(ldb);
2920
2921         /* merge in the source_dsa vector is available */
2922         for (i=0; (ruv && i < ruv->count); i++) {
2923                 found = false;
2924
2925                 if (our_invocation_id &&
2926                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
2927                                our_invocation_id)) {
2928                         continue;
2929                 }
2930
2931                 for (j=0; j < ni; j++) {
2932                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
2933                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
2934                                 continue;
2935                         }
2936
2937                         found = true;
2938
2939                         /*
2940                          * we update only the highest_usn and not the latest_sync_success time,
2941                          * because the last success stands for direct replication
2942                          */
2943                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
2944                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
2945                         }
2946                         break;
2947                 }
2948
2949                 if (found) continue;
2950
2951                 /* if it's not there yet, add it */
2952                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
2953                 ni++;
2954         }
2955
2956         /*
2957          * merge in the current highwatermark for the source_dsa
2958          */
2959         found = false;
2960         for (j=0; j < ni; j++) {
2961                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
2962                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
2963                         continue;
2964                 }
2965
2966                 found = true;
2967
2968                 /*
2969                  * here we update the highest_usn and last_sync_success time
2970                  * because we're directly replicating from the source_dsa
2971                  *
2972                  * and use the tmp_highest_usn because this is what we have just applied
2973                  * to our ldb
2974                  */
2975                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
2976                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
2977                 break;
2978         }
2979         if (!found) {
2980                 /*
2981                  * here we update the highest_usn and last_sync_success time
2982                  * because we're directly replicating from the source_dsa
2983                  *
2984                  * and use the tmp_highest_usn because this is what we have just applied
2985                  * to our ldb
2986                  */
2987                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
2988                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
2989                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
2990                 ni++;
2991         }
2992
2993         /*
2994          * finally correct the size of the cursors array
2995          */
2996         nuv.ctr.ctr2.count = ni;
2997
2998         /*
2999          * sort the cursors
3000          */
3001         qsort(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count,
3002               sizeof(struct drsuapi_DsReplicaCursor2),
3003               (comparison_fn_t)drsuapi_DsReplicaCursor2_compare);
3004
3005         /*
3006          * create the change ldb_message
3007          */
3008         msg = ldb_msg_new(ar);
3009         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3010         msg->dn = ar->search_msg->dn;
3011
3012         ndr_err = ndr_push_struct_blob(&nuv_value, msg,
3013                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3014                                        &nuv,
3015                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3016         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3017                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3018                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3019         }
3020         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3021         if (ret != LDB_SUCCESS) {
3022                 return replmd_replicated_request_error(ar, ret);
3023         }
3024         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3025
3026         /*
3027          * now create the new repsFrom value from the given repsFromTo1 structure
3028          */
3029         ZERO_STRUCT(nrf);
3030         nrf.version                                     = 1;
3031         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3032         /* and fix some values... */
3033         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3034         nrf.ctr.ctr1.last_success                       = now;
3035         nrf.ctr.ctr1.last_attempt                       = now;
3036         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3037         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3038
3039         /*
3040          * first see if we already have a repsFrom value for the current source dsa
3041          * if so we'll later replace this value
3042          */
3043         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3044         if (orf_el) {
3045                 for (i=0; i < orf_el->num_values; i++) {
3046                         struct repsFromToBlob *trf;
3047
3048                         trf = talloc(ar, struct repsFromToBlob);
3049                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3050
3051                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
3052                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3053                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3054                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3055                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3056                         }
3057
3058                         if (trf->version != 1) {
3059                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3060                         }
3061
3062                         /*
3063                          * we compare the source dsa objectGUID not the invocation_id
3064                          * because we want only one repsFrom value per source dsa
3065                          * and when the invocation_id of the source dsa has changed we don't need
3066                          * the old repsFrom with the old invocation_id
3067                          */
3068                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3069                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3070                                 talloc_free(trf);
3071                                 continue;
3072                         }
3073
3074                         talloc_free(trf);
3075                         nrf_value = &orf_el->values[i];
3076                         break;
3077                 }
3078
3079                 /*
3080                  * copy over all old values to the new ldb_message
3081                  */
3082                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3083                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3084                 *nrf_el = *orf_el;
3085         }
3086
3087         /*
3088          * if we haven't found an old repsFrom value for the current source dsa
3089          * we'll add a new value
3090          */
3091         if (!nrf_value) {
3092                 struct ldb_val zero_value;
3093                 ZERO_STRUCT(zero_value);
3094                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3095                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3096
3097                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3098         }
3099
3100         /* we now fill the value which is already attached to ldb_message */
3101         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3102                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3103                                        &nrf,
3104                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3105         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3106                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3107                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3108         }
3109
3110         /*
3111          * the ldb_message_element for the attribute, has all the old values and the new one
3112          * so we'll replace the whole attribute with all values
3113          */
3114         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3115
3116         if (DEBUGLVL(4)) {
3117                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3118                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3119                 talloc_free(s);
3120         }
3121
3122         /* prepare the ldb_modify() request */
3123         ret = ldb_build_mod_req(&change_req,
3124                                 ldb,
3125                                 ar,
3126                                 msg,
3127                                 ar->controls,
3128                                 ar,
3129                                 replmd_replicated_uptodate_modify_callback,
3130                                 ar->req);
3131         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3132
3133         return ldb_next_request(ar->module, change_req);
3134 }
3135
3136 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3137                                                       struct ldb_reply *ares)
3138 {
3139         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3140                                                struct replmd_replicated_request);
3141         int ret;
3142
3143         if (!ares) {
3144                 return ldb_module_done(ar->req, NULL, NULL,
3145                                         LDB_ERR_OPERATIONS_ERROR);
3146         }
3147         if (ares->error != LDB_SUCCESS &&
3148             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3149                 return ldb_module_done(ar->req, ares->controls,
3150                                         ares->response, ares->error);
3151         }
3152
3153         switch (ares->type) {
3154         case LDB_REPLY_ENTRY:
3155                 ar->search_msg = talloc_steal(ar, ares->message);
3156                 break;
3157
3158         case LDB_REPLY_REFERRAL:
3159                 /* we ignore referrals */
3160                 break;
3161
3162         case LDB_REPLY_DONE:
3163                 if (ar->search_msg == NULL) {
3164                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3165                 } else {
3166                         ret = replmd_replicated_uptodate_modify(ar);
3167                 }
3168                 if (ret != LDB_SUCCESS) {
3169                         return ldb_module_done(ar->req, NULL, NULL, ret);
3170                 }
3171         }
3172
3173         talloc_free(ares);
3174         return LDB_SUCCESS;
3175 }
3176
3177
3178 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3179 {
3180         struct ldb_context *ldb;
3181         int ret;
3182         static const char *attrs[] = {
3183                 "replUpToDateVector",
3184                 "repsFrom",
3185                 NULL
3186         };
3187         struct ldb_request *search_req;
3188
3189         ldb = ldb_module_get_ctx(ar->module);
3190         ar->search_msg = NULL;
3191
3192         ret = ldb_build_search_req(&search_req,
3193                                    ldb,
3194                                    ar,
3195                                    ar->objs->partition_dn,
3196                                    LDB_SCOPE_BASE,
3197                                    "(objectClass=*)",
3198                                    attrs,
3199                                    NULL,
3200                                    ar,
3201                                    replmd_replicated_uptodate_search_callback,
3202                                    ar->req);
3203         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3204
3205         return ldb_next_request(ar->module, search_req);
3206 }
3207
3208
3209
3210 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3211 {
3212         struct ldb_context *ldb;
3213         struct dsdb_extended_replicated_objects *objs;
3214         struct replmd_replicated_request *ar;
3215         struct ldb_control **ctrls;
3216         int ret, i;
3217         struct replmd_private *replmd_private =
3218                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3219
3220         ldb = ldb_module_get_ctx(module);
3221
3222         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3223
3224         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3225         if (!objs) {
3226                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3227                 return LDB_ERR_PROTOCOL_ERROR;
3228         }
3229
3230         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3231                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3232                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3233                 return LDB_ERR_PROTOCOL_ERROR;
3234         }
3235
3236         ar = replmd_ctx_init(module, req);
3237         if (!ar)
3238                 return LDB_ERR_OPERATIONS_ERROR;
3239
3240         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3241         ar->apply_mode = true;
3242         ar->objs = objs;
3243         ar->schema = dsdb_get_schema(ldb);
3244         if (!ar->schema) {
3245                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3246                 talloc_free(ar);
3247                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3248                 return LDB_ERR_CONSTRAINT_VIOLATION;
3249         }
3250
3251         ctrls = req->controls;
3252
3253         if (req->controls) {
3254                 req->controls = talloc_memdup(ar, req->controls,
3255                                               talloc_get_size(req->controls));
3256                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3257         }
3258
3259         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3260         if (ret != LDB_SUCCESS) {
3261                 return ret;
3262         }
3263
3264         ar->controls = req->controls;
3265         req->controls = ctrls;
3266
3267         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3268
3269         /* save away the linked attributes for the end of the
3270            transaction */
3271         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3272                 struct la_entry *la_entry;
3273
3274                 if (replmd_private->la_ctx == NULL) {
3275                         replmd_private->la_ctx = talloc_new(replmd_private);
3276                 }
3277                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3278                 if (la_entry == NULL) {
3279                         ldb_oom(ldb);
3280                         return LDB_ERR_OPERATIONS_ERROR;
3281                 }
3282                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3283                 if (la_entry->la == NULL) {
3284                         talloc_free(la_entry);
3285                         ldb_oom(ldb);
3286                         return LDB_ERR_OPERATIONS_ERROR;
3287                 }
3288                 *la_entry->la = ar->objs->linked_attributes[i];
3289
3290                 /* we need to steal the non-scalars so they stay
3291                    around until the end of the transaction */
3292                 talloc_steal(la_entry->la, la_entry->la->identifier);
3293                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3294
3295                 DLIST_ADD(replmd_private->la_list, la_entry);
3296         }
3297
3298         return replmd_replicated_apply_next(ar);
3299 }
3300
3301 /*
3302   process one linked attribute structure
3303  */
3304 static int replmd_process_linked_attribute(struct ldb_module *module,
3305                                            struct la_entry *la_entry)
3306 {
3307         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3308         struct ldb_context *ldb = ldb_module_get_ctx(module);
3309         struct dsdb_schema *schema = dsdb_get_schema(ldb);
3310         struct ldb_message *msg;
3311         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3312         int ret;
3313         const struct dsdb_attribute *attr;
3314         struct dsdb_dn *dsdb_dn;
3315         uint64_t seq_num = 0;
3316         struct drsuapi_DsReplicaAttribute drs;
3317         struct drsuapi_DsAttributeValue val;
3318         struct ldb_message_element new_el, *old_el;
3319         WERROR status;
3320         time_t t = time(NULL);
3321         struct ldb_result *res;
3322         const char *attrs[2];
3323         struct parsed_dn *pdn_list, *pdn;
3324         struct GUID guid;
3325         NTSTATUS ntstatus;
3326         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3327         const struct GUID *our_invocation_id;
3328
3329         drs.value_ctr.num_values = 1;
3330         drs.value_ctr.values = &val;
3331         val.blob = la->value.blob;
3332
3333 /*
3334 linked_attributes[0]:
3335      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3336         identifier               : *
3337             identifier: struct drsuapi_DsReplicaObjectIdentifier
3338                 __ndr_size               : 0x0000003a (58)
3339                 __ndr_size_sid           : 0x00000000 (0)
3340                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3341                 sid                      : S-0-0
3342                 __ndr_size_dn            : 0x00000000 (0)
3343                 dn                       : ''
3344         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3345         value: struct drsuapi_DsAttributeValue
3346             __ndr_size               : 0x0000007e (126)
3347             blob                     : *
3348                 blob                     : DATA_BLOB length=126
3349         flags                    : 0x00000001 (1)
3350                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3351         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3352         meta_data: struct drsuapi_DsReplicaMetaData
3353             version                  : 0x00000015 (21)
3354             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3355             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3356             originating_usn          : 0x000000000001e19c (123292)
3357
3358 (for cases where the link is to a normal DN)
3359      &target: struct drsuapi_DsReplicaObjectIdentifier3
3360         __ndr_size               : 0x0000007e (126)
3361         __ndr_size_sid           : 0x0000001c (28)
3362         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3363         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3364         __ndr_size_dn            : 0x00000022 (34)
3365         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3366  */
3367
3368         /* find the attribute being modified */
3369         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3370         if (attr == NULL) {
3371                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3372                 talloc_free(tmp_ctx);
3373                 return LDB_ERR_OPERATIONS_ERROR;
3374         }
3375
3376         attrs[0] = attr->lDAPDisplayName;
3377         attrs[1] = NULL;
3378
3379         /* get the existing message from the db for the object with
3380            this GUID, returning attribute being modified. We will then
3381            use this msg as the basis for a modify call */
3382         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3383                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3384                                  DSDB_SEARCH_SHOW_DELETED |
3385                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3386                                  DSDB_SEARCH_REVEAL_INTERNALS,
3387                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3388         if (ret != LDB_SUCCESS) {
3389                 talloc_free(tmp_ctx);
3390                 return ret;
3391         }
3392         if (res->count != 1) {
3393                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3394                                        GUID_string(tmp_ctx, &la->identifier->guid));
3395                 talloc_free(tmp_ctx);
3396                 return LDB_ERR_NO_SUCH_OBJECT;
3397         }
3398         msg = res->msgs[0];
3399
3400         if (msg->num_elements == 0) {
3401                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3402                 if (ret != LDB_SUCCESS) {
3403                         ldb_module_oom(module);
3404                         talloc_free(tmp_ctx);
3405                         return LDB_ERR_OPERATIONS_ERROR;
3406                 }
3407         } else {
3408                 old_el = &msg->elements[0];
3409                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3410         }
3411
3412         /* parse the existing links */
3413         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3414         if (ret != LDB_SUCCESS) {
3415                 talloc_free(tmp_ctx);
3416                 return ret;
3417         }
3418
3419         /* get our invocationId */
3420         our_invocation_id = samdb_ntds_invocation_id(ldb);
3421         if (!our_invocation_id) {
3422                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3423                 talloc_free(tmp_ctx);
3424                 return LDB_ERR_OPERATIONS_ERROR;
3425         }
3426
3427         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, our_invocation_id);
3428         if (ret != LDB_SUCCESS) {
3429                 talloc_free(tmp_ctx);
3430                 return ret;
3431         }
3432
3433         status = attr->syntax->drsuapi_to_ldb(ldb, schema, attr, &drs, tmp_ctx, &new_el);
3434         if (!W_ERROR_IS_OK(status)) {
3435                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s\n",
3436                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3437                 return LDB_ERR_OPERATIONS_ERROR;
3438         }
3439
3440         if (new_el.num_values != 1) {
3441                 ldb_asprintf_errstring(ldb, "Failed to find value in linked attribute blob for %s on %s\n",
3442                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3443                 return LDB_ERR_OPERATIONS_ERROR;
3444         }
3445
3446         dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &new_el.values[0], attr->syntax->ldap_oid);
3447         if (!dsdb_dn) {
3448                 ldb_asprintf_errstring(ldb, "Failed to parse DN in linked attribute blob for %s on %s\n",
3449                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3450                 return LDB_ERR_OPERATIONS_ERROR;
3451         }
3452
3453         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3454         if (!NT_STATUS_IS_OK(ntstatus)) {
3455                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s\n",
3456                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3457                 return LDB_ERR_OPERATIONS_ERROR;
3458         }
3459
3460         /* see if this link already exists */
3461         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid);
3462         if (pdn != NULL) {
3463                 /* see if this update is newer than what we have already */
3464                 struct GUID invocation_id = GUID_zero();
3465                 uint32_t version = 0;
3466                 NTTIME change_time = 0;
3467                 bool was_active = ldb_dn_get_extended_component(pdn->dsdb_dn->dn, "DELETED") == NULL;
3468
3469                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3470                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3471                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3472
3473                 if (!replmd_update_is_newer(&invocation_id,
3474                                             &la->meta_data.originating_invocation_id,
3475                                             version,
3476                                             la->meta_data.version,
3477                                             change_time,
3478                                             la->meta_data.originating_change_time)) {
3479                         DEBUG(1,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3480                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3481                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3482                         talloc_free(tmp_ctx);
3483                         return LDB_SUCCESS;
3484                 }
3485
3486                 /* get a seq_num for this change */
3487                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3488                 if (ret != LDB_SUCCESS) {
3489                         talloc_free(tmp_ctx);
3490                         return ret;
3491                 }
3492
3493                 if (was_active) {
3494                         /* remove the existing backlink */
3495                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3496                         if (ret != LDB_SUCCESS) {
3497                                 talloc_free(tmp_ctx);
3498                                 return ret;
3499                         }
3500                 }
3501
3502                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3503                                            &la->meta_data.originating_invocation_id,
3504                                            la->meta_data.originating_usn, seq_num,
3505                                            la->meta_data.originating_change_time,
3506                                            la->meta_data.version,
3507                                            !active);
3508                 if (ret != LDB_SUCCESS) {
3509                         talloc_free(tmp_ctx);
3510                         return ret;
3511                 }
3512
3513                 if (active) {
3514                         /* add the new backlink */
3515                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3516                         if (ret != LDB_SUCCESS) {
3517                                 talloc_free(tmp_ctx);
3518                                 return ret;
3519                         }
3520                 }
3521         } else {
3522                 /* get a seq_num for this change */
3523                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3524                 if (ret != LDB_SUCCESS) {
3525                         talloc_free(tmp_ctx);
3526                         return ret;
3527                 }
3528
3529                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3530                                                 struct ldb_val, old_el->num_values+1);
3531                 if (!old_el->values) {
3532                         ldb_module_oom(module);
3533                         return LDB_ERR_OPERATIONS_ERROR;
3534                 }
3535                 old_el->num_values++;
3536
3537                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3538                                           &la->meta_data.originating_invocation_id,
3539                                           la->meta_data.originating_usn, seq_num,
3540                                           la->meta_data.originating_change_time,
3541                                           la->meta_data.version,
3542                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3543                 if (ret != LDB_SUCCESS) {
3544                         talloc_free(tmp_ctx);
3545                         return ret;
3546                 }
3547
3548                 if (active) {
3549                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3550                                                   true, attr, false);
3551                         if (ret != LDB_SUCCESS) {
3552                                 talloc_free(tmp_ctx);
3553                                 return ret;
3554                         }
3555                 }
3556         }
3557
3558         /* we only change whenChanged and uSNChanged if the seq_num
3559            has changed */
3560         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3561                 talloc_free(tmp_ctx);
3562                 return LDB_ERR_OPERATIONS_ERROR;
3563         }
3564
3565         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3566                 talloc_free(tmp_ctx);
3567                 return LDB_ERR_OPERATIONS_ERROR;
3568         }
3569
3570         ret = dsdb_check_single_valued_link(attr, old_el);
3571         if (ret != LDB_SUCCESS) {
3572                 talloc_free(tmp_ctx);
3573                 return ret;
3574         }
3575
3576         ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
3577         if (ret != LDB_SUCCESS) {
3578                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
3579                           ldb_errstring(ldb),
3580                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
3581                 talloc_free(tmp_ctx);
3582                 return ret;
3583         }
3584
3585         talloc_free(tmp_ctx);
3586
3587         return ret;
3588 }
3589
3590 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
3591 {
3592         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
3593                 return replmd_extended_replicated_objects(module, req);
3594         }
3595
3596         return ldb_next_request(module, req);
3597 }
3598
3599
3600 /*
3601   we hook into the transaction operations to allow us to
3602   perform the linked attribute updates at the end of the whole
3603   transaction. This allows a forward linked attribute to be created
3604   before the object is created. During a vampire, w2k8 sends us linked
3605   attributes before the objects they are part of.
3606  */
3607 static int replmd_start_transaction(struct ldb_module *module)
3608 {
3609         /* create our private structure for this transaction */
3610         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
3611                                                                 struct replmd_private);
3612         replmd_txn_cleanup(replmd_private);
3613
3614         /* free any leftover mod_usn records from cancelled
3615            transactions */
3616         while (replmd_private->ncs) {
3617                 struct nc_entry *e = replmd_private->ncs;
3618                 DLIST_REMOVE(replmd_private->ncs, e);
3619                 talloc_free(e);
3620         }
3621
3622         return ldb_next_start_trans(module);
3623 }
3624
3625 /*
3626   on prepare commit we loop over our queued la_context structures and
3627   apply each of them
3628  */
3629 static int replmd_prepare_commit(struct ldb_module *module)
3630 {
3631         struct replmd_private *replmd_private =
3632                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3633         struct la_entry *la, *prev;
3634         struct la_backlink *bl;
3635         int ret;
3636
3637         /* walk the list backwards, to do the first entry first, as we
3638          * added the entries with DLIST_ADD() which puts them at the
3639          * start of the list */
3640         for (la = replmd_private->la_list; la && la->next; la=la->next) ;
3641
3642         for (; la; la=prev) {
3643                 prev = la->prev;
3644                 DLIST_REMOVE(replmd_private->la_list, la);
3645                 ret = replmd_process_linked_attribute(module, la);
3646                 if (ret != LDB_SUCCESS) {
3647                         replmd_txn_cleanup(replmd_private);
3648                         return ret;
3649                 }
3650         }
3651
3652         /* process our backlink list, creating and deleting backlinks
3653            as necessary */
3654         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
3655                 ret = replmd_process_backlink(module, bl);
3656                 if (ret != LDB_SUCCESS) {
3657                         replmd_txn_cleanup(replmd_private);
3658                         return ret;
3659                 }
3660         }
3661
3662         replmd_txn_cleanup(replmd_private);
3663
3664         /* possibly change @REPLCHANGED */
3665         ret = replmd_notify_store(module);
3666         if (ret != LDB_SUCCESS) {
3667                 return ret;
3668         }
3669
3670         return ldb_next_prepare_commit(module);
3671 }
3672
3673 static int replmd_del_transaction(struct ldb_module *module)
3674 {
3675         struct replmd_private *replmd_private =
3676                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3677         replmd_txn_cleanup(replmd_private);
3678
3679         return ldb_next_del_trans(module);
3680 }
3681
3682
3683 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
3684         .name          = "repl_meta_data",
3685         .init_context      = replmd_init,
3686         .add               = replmd_add,
3687         .modify            = replmd_modify,
3688         .rename            = replmd_rename,
3689         .del               = replmd_delete,
3690         .extended          = replmd_extended,
3691         .start_transaction = replmd_start_transaction,
3692         .prepare_commit    = replmd_prepare_commit,
3693         .del_transaction   = replmd_del_transaction,
3694 };