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, 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, 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, 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
1203         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1204         if (!tstring) {
1205                 return LDB_ERR_OPERATIONS_ERROR;
1206         }
1207         tval = data_blob_string_const(tstring);
1208
1209         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1210         if (!usn_string) {
1211                 return LDB_ERR_OPERATIONS_ERROR;
1212         }
1213         usnv = data_blob_string_const(usn_string);
1214
1215         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1216         if (!usn_string) {
1217                 return LDB_ERR_OPERATIONS_ERROR;
1218         }
1219         local_usnv = data_blob_string_const(usn_string);
1220
1221         vers = data_blob_string_const("0");
1222
1223         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1224         if (!NT_STATUS_IS_OK(status)) {
1225                 return LDB_ERR_OPERATIONS_ERROR;
1226         }
1227
1228         if (deleted) {
1229                 struct ldb_val dv;
1230                 dv = data_blob_string_const("1");
1231                 ret = ldb_dn_set_extended_component(dn, "DELETED", &dv);
1232         } else {
1233                 ret = ldb_dn_set_extended_component(dn, "DELETED", NULL);
1234         }
1235         if (ret != LDB_SUCCESS) return ret;
1236         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1237         if (ret != LDB_SUCCESS) return ret;
1238         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1239         if (ret != LDB_SUCCESS) return ret;
1240         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1241         if (ret != LDB_SUCCESS) return ret;
1242         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1243         if (ret != LDB_SUCCESS) return ret;
1244         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1245         if (ret != LDB_SUCCESS) return ret;
1246         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1247         if (ret != LDB_SUCCESS) return ret;
1248
1249         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1250         if (dnstring == NULL) {
1251                 return LDB_ERR_OPERATIONS_ERROR;
1252         }
1253         *v = data_blob_string_const(dnstring);
1254
1255         return LDB_SUCCESS;
1256 }
1257
1258 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1259                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1260                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime, bool deleted);
1261
1262 /*
1263   check if any links need upgrading from w2k format
1264  */
1265 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, const struct GUID *invocation_id)
1266 {
1267         int i;
1268         for (i=0; i<count; i++) {
1269                 NTSTATUS status;
1270                 uint32_t version;
1271                 int ret;
1272
1273                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1274                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1275                         continue;
1276                 }
1277
1278                 /* it's an old one that needs upgrading */
1279                 ret = replmd_update_la_val(dns, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1280                                            1, 1, 0, false);
1281                 if (ret != LDB_SUCCESS) {
1282                         return ret;
1283                 }
1284         }
1285         return LDB_SUCCESS;
1286 }
1287
1288 /*
1289   update an extended DN, including all meta data fields
1290
1291   see replmd_build_la_val for value names
1292  */
1293 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1294                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1295                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime, bool deleted)
1296 {
1297         struct ldb_dn *dn = dsdb_dn->dn;
1298         const char *tstring, *usn_string;
1299         struct ldb_val tval;
1300         struct ldb_val iid;
1301         struct ldb_val usnv, local_usnv;
1302         struct ldb_val vers;
1303         const struct ldb_val *old_addtime, *old_version;
1304         NTSTATUS status;
1305         int ret;
1306         const char *dnstring;
1307
1308         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1309         if (!tstring) {
1310                 return LDB_ERR_OPERATIONS_ERROR;
1311         }
1312         tval = data_blob_string_const(tstring);
1313
1314         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1315         if (!usn_string) {
1316                 return LDB_ERR_OPERATIONS_ERROR;
1317         }
1318         usnv = data_blob_string_const(usn_string);
1319
1320         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1321         if (!usn_string) {
1322                 return LDB_ERR_OPERATIONS_ERROR;
1323         }
1324         local_usnv = data_blob_string_const(usn_string);
1325
1326         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1327         if (!NT_STATUS_IS_OK(status)) {
1328                 return LDB_ERR_OPERATIONS_ERROR;
1329         }
1330
1331         if (deleted) {
1332                 struct ldb_val dv;
1333                 dv = data_blob_string_const("1");
1334                 ret = ldb_dn_set_extended_component(dn, "DELETED", &dv);
1335         } else {
1336                 ret = ldb_dn_set_extended_component(dn, "DELETED", NULL);
1337         }
1338         if (ret != LDB_SUCCESS) return ret;
1339
1340         /* get the ADDTIME from the original */
1341         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1342         if (old_addtime == NULL) {
1343                 old_addtime = &tval;
1344         }
1345         if (dsdb_dn != old_dsdb_dn) {
1346                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1347                 if (ret != LDB_SUCCESS) return ret;
1348         }
1349
1350         /* use our invocation id */
1351         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1352         if (ret != LDB_SUCCESS) return ret;
1353
1354         /* changetime is the current time */
1355         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1356         if (ret != LDB_SUCCESS) return ret;
1357
1358         /* update the USN */
1359         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1360         if (ret != LDB_SUCCESS) return ret;
1361
1362         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1363         if (ret != LDB_SUCCESS) return ret;
1364
1365         /* increase the version by 1 */
1366         old_version = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_VERSION");
1367         if (old_version == NULL) {
1368                 vers = data_blob_string_const("0");
1369         } else {
1370                 char *vstring;
1371                 vstring = talloc_strndup(dn, (const char *)old_version->data, old_version->length);
1372                 if (!vstring) {
1373                         return LDB_ERR_OPERATIONS_ERROR;
1374                 }
1375                 vstring = talloc_asprintf(dn, "%lu",
1376                                           (unsigned long)strtoul(vstring, NULL, 0)+1);
1377                 vers = data_blob_string_const(vstring);
1378         }
1379         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1380         if (ret != LDB_SUCCESS) return ret;
1381
1382         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1383         if (dnstring == NULL) {
1384                 return LDB_ERR_OPERATIONS_ERROR;
1385         }
1386         *v = data_blob_string_const(dnstring);
1387
1388         return LDB_SUCCESS;
1389 }
1390
1391 /*
1392   handle adding a linked attribute
1393  */
1394 static int replmd_modify_la_add(struct ldb_module *module,
1395                                 struct dsdb_schema *schema,
1396                                 struct ldb_message *msg,
1397                                 struct ldb_message_element *el,
1398                                 struct ldb_message_element *old_el,
1399                                 const struct dsdb_attribute *schema_attr,
1400                                 uint64_t seq_num,
1401                                 time_t t,
1402                                 struct GUID *msg_guid)
1403 {
1404         int i;
1405         struct parsed_dn *dns, *old_dns;
1406         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1407         int ret;
1408         struct ldb_val *new_values = NULL;
1409         unsigned int num_new_values = 0;
1410         unsigned old_num_values = old_el?old_el->num_values:0;
1411         const struct GUID *invocation_id;
1412         struct ldb_context *ldb = ldb_module_get_ctx(module);
1413         NTTIME now;
1414
1415         unix_to_nt_time(&now, t);
1416
1417         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1418         if (ret != LDB_SUCCESS) {
1419                 talloc_free(tmp_ctx);
1420                 return ret;
1421         }
1422
1423         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1424         if (ret != LDB_SUCCESS) {
1425                 talloc_free(tmp_ctx);
1426                 return ret;
1427         }
1428
1429         invocation_id = samdb_ntds_invocation_id(ldb);
1430         if (!invocation_id) {
1431                 talloc_free(tmp_ctx);
1432                 return LDB_ERR_OPERATIONS_ERROR;
1433         }
1434
1435         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1436         if (ret != LDB_SUCCESS) {
1437                 talloc_free(tmp_ctx);
1438                 return ret;
1439         }
1440
1441         /* for each new value, see if it exists already with the same GUID */
1442         for (i=0; i<el->num_values; i++) {
1443                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid);
1444                 if (p == NULL) {
1445                         /* this is a new linked attribute value */
1446                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1447                         if (new_values == NULL) {
1448                                 ldb_module_oom(module);
1449                                 talloc_free(tmp_ctx);
1450                                 return LDB_ERR_OPERATIONS_ERROR;
1451                         }
1452                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1453                                                   invocation_id, seq_num, seq_num, now, false);
1454                         if (ret != LDB_SUCCESS) {
1455                                 talloc_free(tmp_ctx);
1456                                 return ret;
1457                         }
1458                         num_new_values++;
1459                 } else {
1460                         /* this is only allowed if the GUID was
1461                            previously deleted. */
1462                         const struct ldb_val *v;
1463                         v = ldb_dn_get_extended_component(p->dsdb_dn->dn, "DELETED");
1464                         if (v == NULL) {
1465                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1466                                                        el->name, GUID_string(tmp_ctx, p->guid));
1467                                 talloc_free(tmp_ctx);
1468                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1469                         }
1470                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1471                                                    invocation_id, seq_num, seq_num, now, false);
1472                         if (ret != LDB_SUCCESS) {
1473                                 talloc_free(tmp_ctx);
1474                                 return ret;
1475                         }
1476                 }
1477
1478                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1479                 if (ret != LDB_SUCCESS) {
1480                         talloc_free(tmp_ctx);
1481                         return ret;
1482                 }
1483         }
1484
1485         /* add the new ones on to the end of the old values, constructing a new el->values */
1486         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1487                                     struct ldb_val,
1488                                     old_num_values+num_new_values);
1489         if (el->values == NULL) {
1490                 ldb_module_oom(module);
1491                 return LDB_ERR_OPERATIONS_ERROR;
1492         }
1493
1494         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1495         el->num_values = old_num_values + num_new_values;
1496
1497         talloc_steal(msg->elements, el->values);
1498         talloc_steal(el->values, new_values);
1499
1500         talloc_free(tmp_ctx);
1501
1502         /* we now tell the backend to replace all existing values
1503            with the one we have constructed */
1504         el->flags = LDB_FLAG_MOD_REPLACE;
1505
1506         return LDB_SUCCESS;
1507 }
1508
1509
1510 /*
1511   handle deleting all active linked attributes
1512  */
1513 static int replmd_modify_la_delete(struct ldb_module *module,
1514                                    struct dsdb_schema *schema,
1515                                    struct ldb_message *msg,
1516                                    struct ldb_message_element *el,
1517                                    struct ldb_message_element *old_el,
1518                                    const struct dsdb_attribute *schema_attr,
1519                                    uint64_t seq_num,
1520                                    time_t t,
1521                                    struct GUID *msg_guid)
1522 {
1523         int i;
1524         struct parsed_dn *dns, *old_dns;
1525         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1526         int ret;
1527         const struct GUID *invocation_id;
1528         struct ldb_context *ldb = ldb_module_get_ctx(module);
1529         NTTIME now;
1530
1531         unix_to_nt_time(&now, t);
1532
1533         /* check if there is nothing to delete */
1534         if ((!old_el || old_el->num_values == 0) &&
1535             el->num_values == 0) {
1536                 return LDB_SUCCESS;
1537         }
1538
1539         if (!old_el || old_el->num_values == 0) {
1540                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1541         }
1542
1543         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1544         if (ret != LDB_SUCCESS) {
1545                 talloc_free(tmp_ctx);
1546                 return ret;
1547         }
1548
1549         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1550         if (ret != LDB_SUCCESS) {
1551                 talloc_free(tmp_ctx);
1552                 return ret;
1553         }
1554
1555         invocation_id = samdb_ntds_invocation_id(ldb);
1556         if (!invocation_id) {
1557                 return LDB_ERR_OPERATIONS_ERROR;
1558         }
1559
1560         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, invocation_id);
1561         if (ret != LDB_SUCCESS) {
1562                 talloc_free(tmp_ctx);
1563                 return ret;
1564         }
1565
1566         el->values = NULL;
1567
1568         /* see if we are being asked to delete any links that
1569            don't exist or are already deleted */
1570         for (i=0; i<el->num_values; i++) {
1571                 struct parsed_dn *p = &dns[i];
1572                 struct parsed_dn *p2;
1573                 const struct ldb_val *v;
1574
1575                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid);
1576                 if (!p2) {
1577                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1578                                                el->name, GUID_string(tmp_ctx, p->guid));
1579                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1580                 }
1581                 v = ldb_dn_get_extended_component(p2->dsdb_dn->dn, "DELETED");
1582                 if (v) {
1583                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1584                                                el->name, GUID_string(tmp_ctx, p->guid));
1585                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1586                 }
1587         }
1588
1589         /* for each new value, see if it exists already with the same GUID
1590            if it is not already deleted and matches the delete list then delete it
1591         */
1592         for (i=0; i<old_el->num_values; i++) {
1593                 struct parsed_dn *p = &old_dns[i];
1594                 const struct ldb_val *v;
1595
1596                 if (dns && parsed_dn_find(dns, el->num_values, p->guid) == NULL) {
1597                         continue;
1598                 }
1599
1600                 v = ldb_dn_get_extended_component(p->dsdb_dn->dn, "DELETED");
1601                 if (v != NULL) continue;
1602
1603                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1604                                            invocation_id, seq_num, seq_num, now, true);
1605                 if (ret != LDB_SUCCESS) {
1606                         talloc_free(tmp_ctx);
1607                         return ret;
1608                 }
1609
1610                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1611                 if (ret != LDB_SUCCESS) {
1612                         talloc_free(tmp_ctx);
1613                         return ret;
1614                 }
1615         }
1616
1617         el->values = talloc_steal(msg->elements, old_el->values);
1618         el->num_values = old_el->num_values;
1619
1620         talloc_free(tmp_ctx);
1621
1622         /* we now tell the backend to replace all existing values
1623            with the one we have constructed */
1624         el->flags = LDB_FLAG_MOD_REPLACE;
1625
1626         return LDB_SUCCESS;
1627 }
1628
1629 /*
1630   handle replacing a linked attribute
1631  */
1632 static int replmd_modify_la_replace(struct ldb_module *module,
1633                                     struct dsdb_schema *schema,
1634                                     struct ldb_message *msg,
1635                                     struct ldb_message_element *el,
1636                                     struct ldb_message_element *old_el,
1637                                     const struct dsdb_attribute *schema_attr,
1638                                     uint64_t seq_num,
1639                                     time_t t,
1640                                     struct GUID *msg_guid)
1641 {
1642         int i;
1643         struct parsed_dn *dns, *old_dns;
1644         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1645         int ret;
1646         const struct GUID *invocation_id;
1647         struct ldb_context *ldb = ldb_module_get_ctx(module);
1648         struct ldb_val *new_values = NULL;
1649         uint32_t num_new_values = 0;
1650         unsigned old_num_values = old_el?old_el->num_values:0;
1651         NTTIME now;
1652
1653         unix_to_nt_time(&now, t);
1654
1655         /* check if there is nothing to replace */
1656         if ((!old_el || old_el->num_values == 0) &&
1657             el->num_values == 0) {
1658                 return LDB_SUCCESS;
1659         }
1660
1661         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1662         if (ret != LDB_SUCCESS) {
1663                 talloc_free(tmp_ctx);
1664                 return ret;
1665         }
1666
1667         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1668         if (ret != LDB_SUCCESS) {
1669                 talloc_free(tmp_ctx);
1670                 return ret;
1671         }
1672
1673         invocation_id = samdb_ntds_invocation_id(ldb);
1674         if (!invocation_id) {
1675                 return LDB_ERR_OPERATIONS_ERROR;
1676         }
1677
1678         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1679         if (ret != LDB_SUCCESS) {
1680                 talloc_free(tmp_ctx);
1681                 return ret;
1682         }
1683
1684         /* mark all the old ones as deleted */
1685         for (i=0; i<old_num_values; i++) {
1686                 struct parsed_dn *old_p = &old_dns[i];
1687                 struct parsed_dn *p;
1688                 const struct ldb_val *v;
1689
1690                 v = ldb_dn_get_extended_component(old_p->dsdb_dn->dn, "DELETED");
1691                 if (v) continue;
1692
1693                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1694                 if (ret != LDB_SUCCESS) {
1695                         talloc_free(tmp_ctx);
1696                         return ret;
1697                 }
1698
1699                 p = parsed_dn_find(dns, el->num_values, old_p->guid);
1700                 if (p) {
1701                         /* we don't delete it if we are re-adding it */
1702                         continue;
1703                 }
1704
1705                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1706                                            invocation_id, seq_num, seq_num, now, true);
1707                 if (ret != LDB_SUCCESS) {
1708                         talloc_free(tmp_ctx);
1709                         return ret;
1710                 }
1711         }
1712
1713         /* for each new value, either update its meta-data, or add it
1714          * to old_el
1715         */
1716         for (i=0; i<el->num_values; i++) {
1717                 struct parsed_dn *p = &dns[i], *old_p;
1718
1719                 if (old_dns &&
1720                     (old_p = parsed_dn_find(old_dns,
1721                                             old_num_values, p->guid)) != NULL) {
1722                         /* update in place */
1723                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1724                                                    old_p->dsdb_dn, invocation_id,
1725                                                    seq_num, seq_num, now, false);
1726                         if (ret != LDB_SUCCESS) {
1727                                 talloc_free(tmp_ctx);
1728                                 return ret;
1729                         }
1730                 } else {
1731                         /* add a new one */
1732                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1733                                                     num_new_values+1);
1734                         if (new_values == NULL) {
1735                                 ldb_module_oom(module);
1736                                 talloc_free(tmp_ctx);
1737                                 return LDB_ERR_OPERATIONS_ERROR;
1738                         }
1739                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1740                                                   invocation_id, seq_num, seq_num, now, false);
1741                         if (ret != LDB_SUCCESS) {
1742                                 talloc_free(tmp_ctx);
1743                                 return ret;
1744                         }
1745                         num_new_values++;
1746                 }
1747
1748                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1749                 if (ret != LDB_SUCCESS) {
1750                         talloc_free(tmp_ctx);
1751                         return ret;
1752                 }
1753         }
1754
1755         /* add the new values to the end of old_el */
1756         if (num_new_values != 0) {
1757                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1758                                             struct ldb_val, old_num_values+num_new_values);
1759                 if (el->values == NULL) {
1760                         ldb_module_oom(module);
1761                         return LDB_ERR_OPERATIONS_ERROR;
1762                 }
1763                 memcpy(&el->values[old_num_values], &new_values[0],
1764                        sizeof(struct ldb_val)*num_new_values);
1765                 el->num_values = old_num_values + num_new_values;
1766                 talloc_steal(msg->elements, new_values);
1767         } else {
1768                 el->values = old_el->values;
1769                 el->num_values = old_el->num_values;
1770                 talloc_steal(msg->elements, el->values);
1771         }
1772
1773         talloc_free(tmp_ctx);
1774
1775         /* we now tell the backend to replace all existing values
1776            with the one we have constructed */
1777         el->flags = LDB_FLAG_MOD_REPLACE;
1778
1779         return LDB_SUCCESS;
1780 }
1781
1782
1783 /*
1784   handle linked attributes in modify requests
1785  */
1786 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1787                                                struct ldb_message *msg,
1788                                                uint64_t seq_num, time_t t)
1789 {
1790         struct ldb_result *res;
1791         int ret, i;
1792         struct ldb_context *ldb = ldb_module_get_ctx(module);
1793         struct ldb_message *old_msg;
1794         struct dsdb_schema *schema = dsdb_get_schema(ldb);
1795         struct GUID old_guid;
1796
1797         if (seq_num == 0) {
1798                 /* there the replmd_update_rpmd code has already
1799                  * checked and saw that there are no linked
1800                  * attributes */
1801                 return LDB_SUCCESS;
1802         }
1803
1804 #if !W2K3_LINKED_ATTRIBUTES
1805         return LDB_SUCCESS;
1806 #endif
1807
1808         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1809                 /* don't do anything special for linked attributes */
1810                 return LDB_SUCCESS;
1811         }
1812
1813         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1814                                     DSDB_SEARCH_SHOW_DELETED |
1815                                     DSDB_SEARCH_REVEAL_INTERNALS |
1816                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1817         if (ret != LDB_SUCCESS) {
1818                 return ret;
1819         }
1820         old_msg = res->msgs[0];
1821
1822         old_guid = samdb_result_guid(old_msg, "objectGUID");
1823
1824         for (i=0; i<msg->num_elements; i++) {
1825                 struct ldb_message_element *el = &msg->elements[i];
1826                 struct ldb_message_element *old_el, *new_el;
1827                 const struct dsdb_attribute *schema_attr
1828                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1829                 if (!schema_attr) {
1830                         ldb_asprintf_errstring(ldb,
1831                                                "attribute %s is not a valid attribute in schema", el->name);
1832                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
1833                 }
1834                 if (schema_attr->linkID == 0) {
1835                         continue;
1836                 }
1837                 if ((schema_attr->linkID & 1) == 1) {
1838                         /* Odd is for the target.  Illegal to modify */
1839                         ldb_asprintf_errstring(ldb,
1840                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
1841                         return LDB_ERR_UNWILLING_TO_PERFORM;
1842                 }
1843                 old_el = ldb_msg_find_element(old_msg, el->name);
1844                 switch (el->flags & LDB_FLAG_MOD_MASK) {
1845                 case LDB_FLAG_MOD_REPLACE:
1846                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1847                         break;
1848                 case LDB_FLAG_MOD_DELETE:
1849                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1850                         break;
1851                 case LDB_FLAG_MOD_ADD:
1852                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1853                         break;
1854                 default:
1855                         ldb_asprintf_errstring(ldb,
1856                                                "invalid flags 0x%x for %s linked attribute",
1857                                                el->flags, el->name);
1858                         return LDB_ERR_UNWILLING_TO_PERFORM;
1859                 }
1860                 if (ret != LDB_SUCCESS) {
1861                         return ret;
1862                 }
1863                 if (old_el) {
1864                         ldb_msg_remove_attr(old_msg, el->name);
1865                 }
1866                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
1867                 new_el->num_values = el->num_values;
1868                 new_el->values = el->values;
1869
1870                 /* TODO: this relises a bit too heavily on the exact
1871                    behaviour of ldb_msg_find_element and
1872                    ldb_msg_remove_element */
1873                 old_el = ldb_msg_find_element(msg, el->name);
1874                 if (old_el != el) {
1875                         ldb_msg_remove_element(msg, old_el);
1876                         i--;
1877                 }
1878         }
1879
1880         talloc_free(res);
1881         return ret;
1882 }
1883
1884
1885
1886 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
1887 {
1888         struct ldb_context *ldb;
1889         struct replmd_replicated_request *ac;
1890         struct ldb_request *down_req;
1891         struct ldb_message *msg;
1892         time_t t = time(NULL);
1893         int ret;
1894
1895         /* do not manipulate our control entries */
1896         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1897                 return ldb_next_request(module, req);
1898         }
1899
1900         ldb = ldb_module_get_ctx(module);
1901
1902         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
1903
1904         ac = replmd_ctx_init(module, req);
1905         if (!ac) {
1906                 return LDB_ERR_OPERATIONS_ERROR;
1907         }
1908
1909         /* we have to copy the message as the caller might have it as a const */
1910         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
1911         if (msg == NULL) {
1912                 ldb_oom(ldb);
1913                 talloc_free(ac);
1914                 return LDB_ERR_OPERATIONS_ERROR;
1915         }
1916
1917         ret = replmd_update_rpmd(module, ac->schema, msg, &ac->seq_num, t);
1918         if (ret != LDB_SUCCESS) {
1919                 talloc_free(ac);
1920                 return ret;
1921         }
1922
1923         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
1924         if (ret != LDB_SUCCESS) {
1925                 talloc_free(ac);
1926                 return ret;
1927         }
1928
1929         /* TODO:
1930          * - replace the old object with the newly constructed one
1931          */
1932
1933         ret = ldb_build_mod_req(&down_req, ldb, ac,
1934                                 msg,
1935                                 req->controls,
1936                                 ac, replmd_op_callback,
1937                                 req);
1938         if (ret != LDB_SUCCESS) {
1939                 talloc_free(ac);
1940                 return ret;
1941         }
1942         talloc_steal(down_req, msg);
1943
1944         /* we only change whenChanged and uSNChanged if the seq_num
1945            has changed */
1946         if (ac->seq_num != 0) {
1947                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
1948                         talloc_free(ac);
1949                         return ret;
1950                 }
1951
1952                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
1953                         talloc_free(ac);
1954                         return ret;
1955                 }
1956         }
1957
1958         /* go on with the call chain */
1959         return ldb_next_request(module, down_req);
1960 }
1961
1962 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
1963
1964 /*
1965   handle a rename request
1966
1967   On a rename we need to do an extra ldb_modify which sets the
1968   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
1969  */
1970 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
1971 {
1972         struct ldb_context *ldb;
1973         struct replmd_replicated_request *ac;
1974         int ret;
1975         struct ldb_request *down_req;
1976
1977         /* do not manipulate our control entries */
1978         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1979                 return ldb_next_request(module, req);
1980         }
1981
1982         ldb = ldb_module_get_ctx(module);
1983
1984         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
1985
1986         ac = replmd_ctx_init(module, req);
1987         if (!ac) {
1988                 return LDB_ERR_OPERATIONS_ERROR;
1989         }
1990         ret = ldb_build_rename_req(&down_req, ldb, ac,
1991                                    ac->req->op.rename.olddn,
1992                                    ac->req->op.rename.newdn,
1993                                    ac->req->controls,
1994                                    ac, replmd_rename_callback,
1995                                    ac->req);
1996
1997         if (ret != LDB_SUCCESS) {
1998                 talloc_free(ac);
1999                 return ret;
2000         }
2001
2002         /* go on with the call chain */
2003         return ldb_next_request(module, down_req);
2004 }
2005
2006 /* After the rename is compleated, update the whenchanged etc */
2007 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2008 {
2009         struct ldb_context *ldb;
2010         struct replmd_replicated_request *ac;
2011         struct ldb_request *down_req;
2012         struct ldb_message *msg;
2013         time_t t = time(NULL);
2014         int ret;
2015
2016         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2017         ldb = ldb_module_get_ctx(ac->module);
2018
2019         if (ares->error != LDB_SUCCESS) {
2020                 return ldb_module_done(ac->req, ares->controls,
2021                                         ares->response, ares->error);
2022         }
2023
2024         if (ares->type != LDB_REPLY_DONE) {
2025                 ldb_set_errstring(ldb,
2026                                   "invalid ldb_reply_type in callback");
2027                 talloc_free(ares);
2028                 return ldb_module_done(ac->req, NULL, NULL,
2029                                         LDB_ERR_OPERATIONS_ERROR);
2030         }
2031
2032         /* Get a sequence number from the backend */
2033         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2034         if (ret != LDB_SUCCESS) {
2035                 return ret;
2036         }
2037
2038         /* TODO:
2039          * - replace the old object with the newly constructed one
2040          */
2041
2042         msg = ldb_msg_new(ac);
2043         if (msg == NULL) {
2044                 ldb_oom(ldb);
2045                 return LDB_ERR_OPERATIONS_ERROR;
2046         }
2047
2048         msg->dn = ac->req->op.rename.newdn;
2049
2050         ret = ldb_build_mod_req(&down_req, ldb, ac,
2051                                 msg,
2052                                 req->controls,
2053                                 ac, replmd_op_callback,
2054                                 req);
2055
2056         if (ret != LDB_SUCCESS) {
2057                 talloc_free(ac);
2058                 return ret;
2059         }
2060         talloc_steal(down_req, msg);
2061
2062         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2063                 talloc_free(ac);
2064                 return ret;
2065         }
2066
2067         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2068                 talloc_free(ac);
2069                 return ret;
2070         }
2071
2072         /* go on with the call chain - do the modify after the rename */
2073         return ldb_next_request(ac->module, down_req);
2074 }
2075
2076 /* remove forwards and backlinks as needed when an object
2077    is deleted */
2078 static int replmd_delete_remove_link(struct ldb_module *module,
2079                                      struct dsdb_schema *schema,
2080                                      struct ldb_dn *dn,
2081                                      struct ldb_message_element *el,
2082                                      const struct dsdb_attribute *sa)
2083 {
2084         int i;
2085         TALLOC_CTX *tmp_ctx = talloc_new(module);
2086         struct ldb_context *ldb = ldb_module_get_ctx(module);
2087
2088         for (i=0; i<el->num_values; i++) {
2089                 struct dsdb_dn *dsdb_dn;
2090                 NTSTATUS status;
2091                 int ret;
2092                 struct GUID guid2;
2093                 struct ldb_message *msg;
2094                 const struct dsdb_attribute *target_attr;
2095                 struct ldb_message_element *el2;
2096                 struct ldb_val dn_val;
2097
2098                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2099                         continue;
2100                 }
2101
2102                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2103                 if (!dsdb_dn) {
2104                         talloc_free(tmp_ctx);
2105                         return LDB_ERR_OPERATIONS_ERROR;
2106                 }
2107
2108                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2109                 if (!NT_STATUS_IS_OK(status)) {
2110                         talloc_free(tmp_ctx);
2111                         return LDB_ERR_OPERATIONS_ERROR;
2112                 }
2113
2114                 /* remove the link */
2115                 msg = ldb_msg_new(tmp_ctx);
2116                 if (!msg) {
2117                         ldb_module_oom(module);
2118                         talloc_free(tmp_ctx);
2119                         return LDB_ERR_OPERATIONS_ERROR;
2120                 }
2121
2122
2123                 msg->dn = dsdb_dn->dn;
2124
2125                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2126                 if (target_attr == NULL) {
2127                         continue;
2128                 }
2129
2130                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2131                 if (ret != LDB_SUCCESS) {
2132                         ldb_module_oom(module);
2133                         talloc_free(tmp_ctx);
2134                         return LDB_ERR_OPERATIONS_ERROR;
2135                 }
2136                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2137                 el2->values = &dn_val;
2138                 el2->num_values = 1;
2139
2140                 ret = dsdb_module_modify(module, msg, 0);
2141                 if (ret != LDB_SUCCESS) {
2142                         talloc_free(tmp_ctx);
2143                         return ret;
2144                 }
2145         }
2146         talloc_free(tmp_ctx);
2147         return LDB_SUCCESS;
2148 }
2149
2150
2151 /*
2152   handle update of replication meta data for deletion of objects
2153
2154   This also handles the mapping of delete to a rename operation
2155   to allow deletes to be replicated.
2156  */
2157 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2158 {
2159         int ret = LDB_ERR_OTHER;
2160         bool retb;
2161         struct ldb_dn *old_dn, *new_dn;
2162         const char *rdn_name;
2163         const struct ldb_val *rdn_value, *new_rdn_value;
2164         struct GUID guid;
2165         struct ldb_context *ldb = ldb_module_get_ctx(module);
2166         struct dsdb_schema *schema = dsdb_get_schema(ldb);
2167         struct ldb_message *msg, *old_msg;
2168         struct ldb_message_element *el;
2169         TALLOC_CTX *tmp_ctx;
2170         struct ldb_result *res, *parent_res;
2171         const char *preserved_attrs[] = {
2172                 /* yes, this really is a hard coded list. See MS-ADTS
2173                    section 3.1.1.5.5.1.1 */
2174                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2175                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2176                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2177                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2178                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2179                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2180                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreate",
2181                 NULL};
2182         uint32_t el_count = 0;
2183         int i;
2184
2185         tmp_ctx = talloc_new(ldb);
2186
2187         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2188
2189         /* we need the complete msg off disk, so we can work out which
2190            attributes need to be removed */
2191         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2192                                     DSDB_SEARCH_SHOW_DELETED |
2193                                     DSDB_SEARCH_REVEAL_INTERNALS |
2194                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2195         if (ret != LDB_SUCCESS) {
2196                 talloc_free(tmp_ctx);
2197                 return ret;
2198         }
2199         old_msg = res->msgs[0];
2200
2201         /* work out where we will be renaming this object to */
2202         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2203         if (ret != LDB_SUCCESS) {
2204                 /* this is probably an attempted delete on a partition
2205                  * that doesn't allow delete operations, such as the
2206                  * schema partition */
2207                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2208                                        ldb_dn_get_linearized(old_dn));
2209                 talloc_free(tmp_ctx);
2210                 return LDB_ERR_UNWILLING_TO_PERFORM;
2211         }
2212
2213         rdn_name = ldb_dn_get_rdn_name(old_dn);
2214         rdn_value = ldb_dn_get_rdn_val(old_dn);
2215
2216         /* get the objects GUID from the search we just did */
2217         guid = samdb_result_guid(old_msg, "objectGUID");
2218
2219         /* Add a formatted child */
2220         retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2221                                     rdn_name,
2222                                     rdn_value->data,
2223                                     GUID_string(tmp_ctx, &guid));
2224         if (!retb) {
2225                 DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2226                                 ldb_dn_get_linearized(new_dn)));
2227                 talloc_free(tmp_ctx);
2228                 return LDB_ERR_OPERATIONS_ERROR;
2229         }
2230
2231         /*
2232           now we need to modify the object in the following ways:
2233
2234           - add isDeleted=TRUE
2235           - update rDN and name, with new rDN
2236           - remove linked attributes
2237           - remove objectCategory and sAMAccountType
2238           - remove attribs not on the preserved list
2239              - preserved if in above list, or is rDN
2240           - remove all linked attribs from this object
2241           - remove all links from other objects to this object
2242           - add lastKnownParent
2243           - update replPropertyMetaData?
2244
2245           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2246          */
2247
2248         msg = ldb_msg_new(tmp_ctx);
2249         if (msg == NULL) {
2250                 ldb_module_oom(module);
2251                 talloc_free(tmp_ctx);
2252                 return LDB_ERR_OPERATIONS_ERROR;
2253         }
2254
2255         msg->dn = old_dn;
2256
2257         ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2258         if (ret != LDB_SUCCESS) {
2259                 DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2260                 ldb_module_oom(module);
2261                 talloc_free(tmp_ctx);
2262                 return ret;
2263         }
2264         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2265
2266         /* we need the storage form of the parent GUID */
2267         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2268                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2269                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2270                                     DSDB_SEARCH_REVEAL_INTERNALS);
2271         if (ret != LDB_SUCCESS) {
2272                 talloc_free(tmp_ctx);
2273                 return ret;
2274         }
2275
2276         ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2277                                        ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2278         if (ret != LDB_SUCCESS) {
2279                 DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2280                 ldb_module_oom(module);
2281                 talloc_free(tmp_ctx);
2282                 return ret;
2283         }
2284         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2285
2286         /* work out which of the old attributes we will be removing */
2287         for (i=0; i<old_msg->num_elements; i++) {
2288                 const struct dsdb_attribute *sa;
2289                 el = &old_msg->elements[i];
2290                 sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2291                 if (!sa) {
2292                         talloc_free(tmp_ctx);
2293                         return LDB_ERR_OPERATIONS_ERROR;
2294                 }
2295                 if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2296                         /* don't remove the rDN */
2297                         continue;
2298                 }
2299
2300                 if (sa->linkID) {
2301                         ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2302                         if (ret != LDB_SUCCESS) {
2303                                 talloc_free(tmp_ctx);
2304                                 return LDB_ERR_OPERATIONS_ERROR;
2305                         }
2306                 }
2307
2308                 if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2309                         continue;
2310                 }
2311
2312                 ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2313                 if (ret != LDB_SUCCESS) {
2314                         talloc_free(tmp_ctx);
2315                         ldb_module_oom(module);
2316                         return ret;
2317                 }
2318         }
2319
2320         /* work out what the new rdn value is, for updating the
2321            rDN and name fields */
2322         new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2323         ret = ldb_msg_add_value(msg, rdn_name, new_rdn_value, &el);
2324         if (ret != LDB_SUCCESS) {
2325                 talloc_free(tmp_ctx);
2326                 return ret;
2327         }
2328         el->flags = LDB_FLAG_MOD_REPLACE;
2329
2330         el = ldb_msg_find_element(old_msg, "name");
2331         if (el) {
2332                 ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2333                 if (ret != LDB_SUCCESS) {
2334                         talloc_free(tmp_ctx);
2335                         return ret;
2336                 }
2337                 el->flags = LDB_FLAG_MOD_REPLACE;
2338         }
2339
2340         ret = dsdb_module_modify(module, msg, 0);
2341         if (ret != LDB_SUCCESS){
2342                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2343                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2344                 talloc_free(tmp_ctx);
2345                 return ret;
2346         }
2347
2348         /* now rename onto the new DN */
2349         ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2350         if (ret != LDB_SUCCESS){
2351                 DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2352                          ldb_dn_get_linearized(old_dn),
2353                          ldb_dn_get_linearized(new_dn),
2354                          ldb_errstring(ldb)));
2355                 talloc_free(tmp_ctx);
2356                 return ret;
2357         }
2358
2359         talloc_free(tmp_ctx);
2360
2361         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2362 }
2363
2364
2365
2366 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2367 {
2368         return ret;
2369 }
2370
2371 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2372 {
2373         int ret = LDB_ERR_OTHER;
2374         /* TODO: do some error mapping */
2375         return ret;
2376 }
2377
2378 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2379 {
2380         struct ldb_context *ldb;
2381         struct ldb_request *change_req;
2382         enum ndr_err_code ndr_err;
2383         struct ldb_message *msg;
2384         struct replPropertyMetaDataBlob *md;
2385         struct ldb_val md_value;
2386         uint32_t i;
2387         int ret;
2388
2389         /*
2390          * TODO: check if the parent object exist
2391          */
2392
2393         /*
2394          * TODO: handle the conflict case where an object with the
2395          *       same name exist
2396          */
2397
2398         ldb = ldb_module_get_ctx(ar->module);
2399         msg = ar->objs->objects[ar->index_current].msg;
2400         md = ar->objs->objects[ar->index_current].meta_data;
2401
2402         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2403         if (ret != LDB_SUCCESS) {
2404                 return replmd_replicated_request_error(ar, ret);
2405         }
2406
2407         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2408         if (ret != LDB_SUCCESS) {
2409                 return replmd_replicated_request_error(ar, ret);
2410         }
2411
2412         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2413         if (ret != LDB_SUCCESS) {
2414                 return replmd_replicated_request_error(ar, ret);
2415         }
2416
2417         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2418         if (ret != LDB_SUCCESS) {
2419                 return replmd_replicated_request_error(ar, ret);
2420         }
2421
2422         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2423         if (ret != LDB_SUCCESS) {
2424                 return replmd_replicated_request_error(ar, ret);
2425         }
2426
2427         /* remove any message elements that have zero values */
2428         for (i=0; i<msg->num_elements; i++) {
2429                 struct ldb_message_element *el = &msg->elements[i];
2430
2431                 if (el->num_values == 0) {
2432                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2433                                  el->name));
2434                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2435                         msg->num_elements--;
2436                         i--;
2437                         continue;
2438                 }
2439         }
2440
2441         /*
2442          * the meta data array is already sorted by the caller
2443          */
2444         for (i=0; i < md->ctr.ctr1.count; i++) {
2445                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2446         }
2447         ndr_err = ndr_push_struct_blob(&md_value, msg,
2448                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2449                                        md,
2450                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2451         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2452                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2453                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2454         }
2455         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2456         if (ret != LDB_SUCCESS) {
2457                 return replmd_replicated_request_error(ar, ret);
2458         }
2459
2460         replmd_ldb_message_sort(msg, ar->schema);
2461
2462         if (DEBUGLVL(4)) {
2463                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2464                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2465                 talloc_free(s);
2466         }
2467
2468         ret = ldb_build_add_req(&change_req,
2469                                 ldb,
2470                                 ar,
2471                                 msg,
2472                                 ar->controls,
2473                                 ar,
2474                                 replmd_op_callback,
2475                                 ar->req);
2476         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2477
2478         return ldb_next_request(ar->module, change_req);
2479 }
2480
2481 /*
2482    return true if an update is newer than an existing entry
2483    see section 5.11 of MS-ADTS
2484 */
2485 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2486                                    const struct GUID *update_invocation_id,
2487                                    uint32_t current_version,
2488                                    uint32_t update_version,
2489                                    NTTIME current_change_time,
2490                                    NTTIME update_change_time)
2491 {
2492         if (update_version != current_version) {
2493                 return update_version > current_version;
2494         }
2495         if (update_change_time > current_change_time) {
2496                 return true;
2497         }
2498         if (update_change_time == current_change_time) {
2499                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2500         }
2501         return false;
2502 }
2503
2504 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2505                                                   struct replPropertyMetaData1 *new_m)
2506 {
2507         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2508                                       &new_m->originating_invocation_id,
2509                                       cur_m->version,
2510                                       new_m->version,
2511                                       cur_m->originating_change_time,
2512                                       new_m->originating_change_time);
2513 }
2514
2515 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2516 {
2517         struct ldb_context *ldb;
2518         struct ldb_request *change_req;
2519         enum ndr_err_code ndr_err;
2520         struct ldb_message *msg;
2521         struct replPropertyMetaDataBlob *rmd;
2522         struct replPropertyMetaDataBlob omd;
2523         const struct ldb_val *omd_value;
2524         struct replPropertyMetaDataBlob nmd;
2525         struct ldb_val nmd_value;
2526         uint32_t i,j,ni=0;
2527         uint32_t removed_attrs = 0;
2528         int ret;
2529
2530         ldb = ldb_module_get_ctx(ar->module);
2531         msg = ar->objs->objects[ar->index_current].msg;
2532         rmd = ar->objs->objects[ar->index_current].meta_data;
2533         ZERO_STRUCT(omd);
2534         omd.version = 1;
2535
2536         /*
2537          * TODO: check repl data is correct after a rename
2538          */
2539         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2540                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2541                           ldb_dn_get_linearized(ar->search_msg->dn),
2542                           ldb_dn_get_linearized(msg->dn));
2543                 /* we can't use dsdb_module_rename() here as we need
2544                    the rename call to be intercepted by this module, to
2545                    allow it to process linked attribute changes */
2546                 if (ldb_rename(ldb, ar->search_msg->dn, msg->dn) != LDB_SUCCESS) {
2547                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2548                                   ldb_dn_get_linearized(ar->search_msg->dn),
2549                                   ldb_dn_get_linearized(msg->dn),
2550                                   ldb_errstring(ldb));
2551                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2552                 }
2553         }
2554
2555         /* find existing meta data */
2556         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2557         if (omd_value) {
2558                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
2559                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
2560                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2561                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2562                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2563                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2564                 }
2565
2566                 if (omd.version != 1) {
2567                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2568                 }
2569         }
2570
2571         ZERO_STRUCT(nmd);
2572         nmd.version = 1;
2573         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2574         nmd.ctr.ctr1.array = talloc_array(ar,
2575                                           struct replPropertyMetaData1,
2576                                           nmd.ctr.ctr1.count);
2577         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2578
2579         /* first copy the old meta data */
2580         for (i=0; i < omd.ctr.ctr1.count; i++) {
2581                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2582                 ni++;
2583         }
2584
2585         /* now merge in the new meta data */
2586         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2587                 bool found = false;
2588
2589                 for (j=0; j < ni; j++) {
2590                         bool cmp;
2591
2592                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2593                                 continue;
2594                         }
2595
2596                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2597                                                                     &rmd->ctr.ctr1.array[i]);
2598                         if (cmp) {
2599                                 /* replace the entry */
2600                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2601                                 found = true;
2602                                 break;
2603                         }
2604
2605                         DEBUG(1,("Discarding older DRS attribute update to %s on %s from %s\n",
2606                                  msg->elements[i-removed_attrs].name,
2607                                  ldb_dn_get_linearized(msg->dn),
2608                                  GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2609
2610                         /* we don't want to apply this change so remove the attribute */
2611                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2612                         removed_attrs++;
2613
2614                         found = true;
2615                         break;
2616                 }
2617
2618                 if (found) continue;
2619
2620                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2621                 ni++;
2622         }
2623
2624         /*
2625          * finally correct the size of the meta_data array
2626          */
2627         nmd.ctr.ctr1.count = ni;
2628
2629         /*
2630          * the rdn attribute (the alias for the name attribute),
2631          * 'cn' for most objects is the last entry in the meta data array
2632          * we have stored
2633          *
2634          * sort the new meta data array
2635          */
2636         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2637         if (ret != LDB_SUCCESS) {
2638                 return ret;
2639         }
2640
2641         /*
2642          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2643          */
2644         if (msg->num_elements == 0) {
2645                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2646                           ar->index_current);
2647
2648                 ar->index_current++;
2649                 return replmd_replicated_apply_next(ar);
2650         }
2651
2652         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2653                   ar->index_current, msg->num_elements);
2654
2655         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2656         if (ret != LDB_SUCCESS) {
2657                 return replmd_replicated_request_error(ar, ret);
2658         }
2659
2660         for (i=0; i<ni; i++) {
2661                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2662         }
2663
2664         /* create the meta data value */
2665         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
2666                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2667                                        &nmd,
2668                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2669         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2670                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2671                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2672         }
2673
2674         /*
2675          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2676          * and replPopertyMetaData attributes
2677          */
2678         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2679         if (ret != LDB_SUCCESS) {
2680                 return replmd_replicated_request_error(ar, ret);
2681         }
2682         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2683         if (ret != LDB_SUCCESS) {
2684                 return replmd_replicated_request_error(ar, ret);
2685         }
2686         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2687         if (ret != LDB_SUCCESS) {
2688                 return replmd_replicated_request_error(ar, ret);
2689         }
2690
2691         replmd_ldb_message_sort(msg, ar->schema);
2692
2693         /* we want to replace the old values */
2694         for (i=0; i < msg->num_elements; i++) {
2695                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
2696         }
2697
2698         if (DEBUGLVL(4)) {
2699                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
2700                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
2701                 talloc_free(s);
2702         }
2703
2704         ret = ldb_build_mod_req(&change_req,
2705                                 ldb,
2706                                 ar,
2707                                 msg,
2708                                 ar->controls,
2709                                 ar,
2710                                 replmd_op_callback,
2711                                 ar->req);
2712         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2713
2714         return ldb_next_request(ar->module, change_req);
2715 }
2716
2717 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
2718                                                    struct ldb_reply *ares)
2719 {
2720         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2721                                                struct replmd_replicated_request);
2722         int ret;
2723
2724         if (!ares) {
2725                 return ldb_module_done(ar->req, NULL, NULL,
2726                                         LDB_ERR_OPERATIONS_ERROR);
2727         }
2728         if (ares->error != LDB_SUCCESS &&
2729             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
2730                 return ldb_module_done(ar->req, ares->controls,
2731                                         ares->response, ares->error);
2732         }
2733
2734         switch (ares->type) {
2735         case LDB_REPLY_ENTRY:
2736                 ar->search_msg = talloc_steal(ar, ares->message);
2737                 break;
2738
2739         case LDB_REPLY_REFERRAL:
2740                 /* we ignore referrals */
2741                 break;
2742
2743         case LDB_REPLY_DONE:
2744                 if (ar->search_msg != NULL) {
2745                         ret = replmd_replicated_apply_merge(ar);
2746                 } else {
2747                         ret = replmd_replicated_apply_add(ar);
2748                 }
2749                 if (ret != LDB_SUCCESS) {
2750                         return ldb_module_done(ar->req, NULL, NULL, ret);
2751                 }
2752         }
2753
2754         talloc_free(ares);
2755         return LDB_SUCCESS;
2756 }
2757
2758 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
2759
2760 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
2761 {
2762         struct ldb_context *ldb;
2763         int ret;
2764         char *tmp_str;
2765         char *filter;
2766         struct ldb_request *search_req;
2767         struct ldb_search_options_control *options;
2768
2769         if (ar->index_current >= ar->objs->num_objects) {
2770                 /* done with it, go to next stage */
2771                 return replmd_replicated_uptodate_vector(ar);
2772         }
2773
2774         ldb = ldb_module_get_ctx(ar->module);
2775         ar->search_msg = NULL;
2776
2777         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
2778         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2779
2780         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
2781         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2782         talloc_free(tmp_str);
2783
2784         ret = ldb_build_search_req(&search_req,
2785                                    ldb,
2786                                    ar,
2787                                    NULL,
2788                                    LDB_SCOPE_SUBTREE,
2789                                    filter,
2790                                    NULL,
2791                                    NULL,
2792                                    ar,
2793                                    replmd_replicated_apply_search_callback,
2794                                    ar->req);
2795
2796         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
2797         if (ret != LDB_SUCCESS) {
2798                 return ret;
2799         }
2800
2801         /* we need to cope with cross-partition links, so search for
2802            the GUID over all partitions */
2803         options = talloc(search_req, struct ldb_search_options_control);
2804         if (options == NULL) {
2805                 DEBUG(0, (__location__ ": out of memory\n"));
2806                 return LDB_ERR_OPERATIONS_ERROR;
2807         }
2808         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
2809
2810         ret = ldb_request_add_control(search_req,
2811                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
2812                                       true, options);
2813         if (ret != LDB_SUCCESS) {
2814                 return ret;
2815         }
2816
2817         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2818
2819         return ldb_next_request(ar->module, search_req);
2820 }
2821
2822 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
2823                                                       struct ldb_reply *ares)
2824 {
2825         struct ldb_context *ldb;
2826         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2827                                                struct replmd_replicated_request);
2828         ldb = ldb_module_get_ctx(ar->module);
2829
2830         if (!ares) {
2831                 return ldb_module_done(ar->req, NULL, NULL,
2832                                         LDB_ERR_OPERATIONS_ERROR);
2833         }
2834         if (ares->error != LDB_SUCCESS) {
2835                 return ldb_module_done(ar->req, ares->controls,
2836                                         ares->response, ares->error);
2837         }
2838
2839         if (ares->type != LDB_REPLY_DONE) {
2840                 ldb_set_errstring(ldb, "Invalid reply type\n!");
2841                 return ldb_module_done(ar->req, NULL, NULL,
2842                                         LDB_ERR_OPERATIONS_ERROR);
2843         }
2844
2845         talloc_free(ares);
2846
2847         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
2848 }
2849
2850 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
2851 {
2852         struct ldb_context *ldb;
2853         struct ldb_request *change_req;
2854         enum ndr_err_code ndr_err;
2855         struct ldb_message *msg;
2856         struct replUpToDateVectorBlob ouv;
2857         const struct ldb_val *ouv_value;
2858         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
2859         struct replUpToDateVectorBlob nuv;
2860         struct ldb_val nuv_value;
2861         struct ldb_message_element *nuv_el = NULL;
2862         const struct GUID *our_invocation_id;
2863         struct ldb_message_element *orf_el = NULL;
2864         struct repsFromToBlob nrf;
2865         struct ldb_val *nrf_value = NULL;
2866         struct ldb_message_element *nrf_el = NULL;
2867         uint32_t i,j,ni=0;
2868         bool found = false;
2869         time_t t = time(NULL);
2870         NTTIME now;
2871         int ret;
2872
2873         ldb = ldb_module_get_ctx(ar->module);
2874         ruv = ar->objs->uptodateness_vector;
2875         ZERO_STRUCT(ouv);
2876         ouv.version = 2;
2877         ZERO_STRUCT(nuv);
2878         nuv.version = 2;
2879
2880         unix_to_nt_time(&now, t);
2881
2882         /*
2883          * first create the new replUpToDateVector
2884          */
2885         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
2886         if (ouv_value) {
2887                 ndr_err = ndr_pull_struct_blob(ouv_value, ar,
2888                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
2889                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
2890                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2891                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2892                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2893                 }
2894
2895                 if (ouv.version != 2) {
2896                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2897                 }
2898         }
2899
2900         /*
2901          * the new uptodateness vector will at least
2902          * contain 1 entry, one for the source_dsa
2903          *
2904          * plus optional values from our old vector and the one from the source_dsa
2905          */
2906         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
2907         if (ruv) nuv.ctr.ctr2.count += ruv->count;
2908         nuv.ctr.ctr2.cursors = talloc_array(ar,
2909                                             struct drsuapi_DsReplicaCursor2,
2910                                             nuv.ctr.ctr2.count);
2911         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2912
2913         /* first copy the old vector */
2914         for (i=0; i < ouv.ctr.ctr2.count; i++) {
2915                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
2916                 ni++;
2917         }
2918
2919         /* get our invocation_id if we have one already attached to the ldb */
2920         our_invocation_id = samdb_ntds_invocation_id(ldb);
2921
2922         /* merge in the source_dsa vector is available */
2923         for (i=0; (ruv && i < ruv->count); i++) {
2924                 found = false;
2925
2926                 if (our_invocation_id &&
2927                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
2928                                our_invocation_id)) {
2929                         continue;
2930                 }
2931
2932                 for (j=0; j < ni; j++) {
2933                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
2934                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
2935                                 continue;
2936                         }
2937
2938                         found = true;
2939
2940                         /*
2941                          * we update only the highest_usn and not the latest_sync_success time,
2942                          * because the last success stands for direct replication
2943                          */
2944                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
2945                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
2946                         }
2947                         break;
2948                 }
2949
2950                 if (found) continue;
2951
2952                 /* if it's not there yet, add it */
2953                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
2954                 ni++;
2955         }
2956
2957         /*
2958          * merge in the current highwatermark for the source_dsa
2959          */
2960         found = false;
2961         for (j=0; j < ni; j++) {
2962                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
2963                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
2964                         continue;
2965                 }
2966
2967                 found = true;
2968
2969                 /*
2970                  * here we update the highest_usn and last_sync_success time
2971                  * because we're directly replicating from the source_dsa
2972                  *
2973                  * and use the tmp_highest_usn because this is what we have just applied
2974                  * to our ldb
2975                  */
2976                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
2977                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
2978                 break;
2979         }
2980         if (!found) {
2981                 /*
2982                  * here we update the highest_usn and last_sync_success time
2983                  * because we're directly replicating from the source_dsa
2984                  *
2985                  * and use the tmp_highest_usn because this is what we have just applied
2986                  * to our ldb
2987                  */
2988                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
2989                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
2990                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
2991                 ni++;
2992         }
2993
2994         /*
2995          * finally correct the size of the cursors array
2996          */
2997         nuv.ctr.ctr2.count = ni;
2998
2999         /*
3000          * sort the cursors
3001          */
3002         qsort(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count,
3003               sizeof(struct drsuapi_DsReplicaCursor2),
3004               (comparison_fn_t)drsuapi_DsReplicaCursor2_compare);
3005
3006         /*
3007          * create the change ldb_message
3008          */
3009         msg = ldb_msg_new(ar);
3010         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3011         msg->dn = ar->search_msg->dn;
3012
3013         ndr_err = ndr_push_struct_blob(&nuv_value, msg,
3014                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3015                                        &nuv,
3016                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3017         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3018                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3019                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3020         }
3021         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3022         if (ret != LDB_SUCCESS) {
3023                 return replmd_replicated_request_error(ar, ret);
3024         }
3025         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3026
3027         /*
3028          * now create the new repsFrom value from the given repsFromTo1 structure
3029          */
3030         ZERO_STRUCT(nrf);
3031         nrf.version                                     = 1;
3032         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3033         /* and fix some values... */
3034         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3035         nrf.ctr.ctr1.last_success                       = now;
3036         nrf.ctr.ctr1.last_attempt                       = now;
3037         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3038         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3039
3040         /*
3041          * first see if we already have a repsFrom value for the current source dsa
3042          * if so we'll later replace this value
3043          */
3044         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3045         if (orf_el) {
3046                 for (i=0; i < orf_el->num_values; i++) {
3047                         struct repsFromToBlob *trf;
3048
3049                         trf = talloc(ar, struct repsFromToBlob);
3050                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3051
3052                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
3053                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3054                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3055                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3056                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3057                         }
3058
3059                         if (trf->version != 1) {
3060                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3061                         }
3062
3063                         /*
3064                          * we compare the source dsa objectGUID not the invocation_id
3065                          * because we want only one repsFrom value per source dsa
3066                          * and when the invocation_id of the source dsa has changed we don't need
3067                          * the old repsFrom with the old invocation_id
3068                          */
3069                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3070                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3071                                 talloc_free(trf);
3072                                 continue;
3073                         }
3074
3075                         talloc_free(trf);
3076                         nrf_value = &orf_el->values[i];
3077                         break;
3078                 }
3079
3080                 /*
3081                  * copy over all old values to the new ldb_message
3082                  */
3083                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3084                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3085                 *nrf_el = *orf_el;
3086         }
3087
3088         /*
3089          * if we haven't found an old repsFrom value for the current source dsa
3090          * we'll add a new value
3091          */
3092         if (!nrf_value) {
3093                 struct ldb_val zero_value;
3094                 ZERO_STRUCT(zero_value);
3095                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3096                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3097
3098                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3099         }
3100
3101         /* we now fill the value which is already attached to ldb_message */
3102         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3103                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3104                                        &nrf,
3105                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3106         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3107                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3108                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3109         }
3110
3111         /*
3112          * the ldb_message_element for the attribute, has all the old values and the new one
3113          * so we'll replace the whole attribute with all values
3114          */
3115         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3116
3117         if (DEBUGLVL(4)) {
3118                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3119                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3120                 talloc_free(s);
3121         }
3122
3123         /* prepare the ldb_modify() request */
3124         ret = ldb_build_mod_req(&change_req,
3125                                 ldb,
3126                                 ar,
3127                                 msg,
3128                                 ar->controls,
3129                                 ar,
3130                                 replmd_replicated_uptodate_modify_callback,
3131                                 ar->req);
3132         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3133
3134         return ldb_next_request(ar->module, change_req);
3135 }
3136
3137 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3138                                                       struct ldb_reply *ares)
3139 {
3140         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3141                                                struct replmd_replicated_request);
3142         int ret;
3143
3144         if (!ares) {
3145                 return ldb_module_done(ar->req, NULL, NULL,
3146                                         LDB_ERR_OPERATIONS_ERROR);
3147         }
3148         if (ares->error != LDB_SUCCESS &&
3149             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3150                 return ldb_module_done(ar->req, ares->controls,
3151                                         ares->response, ares->error);
3152         }
3153
3154         switch (ares->type) {
3155         case LDB_REPLY_ENTRY:
3156                 ar->search_msg = talloc_steal(ar, ares->message);
3157                 break;
3158
3159         case LDB_REPLY_REFERRAL:
3160                 /* we ignore referrals */
3161                 break;
3162
3163         case LDB_REPLY_DONE:
3164                 if (ar->search_msg == NULL) {
3165                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3166                 } else {
3167                         ret = replmd_replicated_uptodate_modify(ar);
3168                 }
3169                 if (ret != LDB_SUCCESS) {
3170                         return ldb_module_done(ar->req, NULL, NULL, ret);
3171                 }
3172         }
3173
3174         talloc_free(ares);
3175         return LDB_SUCCESS;
3176 }
3177
3178
3179 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3180 {
3181         struct ldb_context *ldb;
3182         int ret;
3183         static const char *attrs[] = {
3184                 "replUpToDateVector",
3185                 "repsFrom",
3186                 NULL
3187         };
3188         struct ldb_request *search_req;
3189
3190         ldb = ldb_module_get_ctx(ar->module);
3191         ar->search_msg = NULL;
3192
3193         ret = ldb_build_search_req(&search_req,
3194                                    ldb,
3195                                    ar,
3196                                    ar->objs->partition_dn,
3197                                    LDB_SCOPE_BASE,
3198                                    "(objectClass=*)",
3199                                    attrs,
3200                                    NULL,
3201                                    ar,
3202                                    replmd_replicated_uptodate_search_callback,
3203                                    ar->req);
3204         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3205
3206         return ldb_next_request(ar->module, search_req);
3207 }
3208
3209
3210
3211 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3212 {
3213         struct ldb_context *ldb;
3214         struct dsdb_extended_replicated_objects *objs;
3215         struct replmd_replicated_request *ar;
3216         struct ldb_control **ctrls;
3217         int ret, i;
3218         struct replmd_private *replmd_private =
3219                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3220
3221         ldb = ldb_module_get_ctx(module);
3222
3223         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3224
3225         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3226         if (!objs) {
3227                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3228                 return LDB_ERR_PROTOCOL_ERROR;
3229         }
3230
3231         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3232                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3233                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3234                 return LDB_ERR_PROTOCOL_ERROR;
3235         }
3236
3237         ar = replmd_ctx_init(module, req);
3238         if (!ar)
3239                 return LDB_ERR_OPERATIONS_ERROR;
3240
3241         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3242         ar->apply_mode = true;
3243         ar->objs = objs;
3244         ar->schema = dsdb_get_schema(ldb);
3245         if (!ar->schema) {
3246                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3247                 talloc_free(ar);
3248                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3249                 return LDB_ERR_CONSTRAINT_VIOLATION;
3250         }
3251
3252         ctrls = req->controls;
3253
3254         if (req->controls) {
3255                 req->controls = talloc_memdup(ar, req->controls,
3256                                               talloc_get_size(req->controls));
3257                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3258         }
3259
3260         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3261         if (ret != LDB_SUCCESS) {
3262                 return ret;
3263         }
3264
3265         ar->controls = req->controls;
3266         req->controls = ctrls;
3267
3268         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3269
3270         /* save away the linked attributes for the end of the
3271            transaction */
3272         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3273                 struct la_entry *la_entry;
3274
3275                 if (replmd_private->la_ctx == NULL) {
3276                         replmd_private->la_ctx = talloc_new(replmd_private);
3277                 }
3278                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3279                 if (la_entry == NULL) {
3280                         ldb_oom(ldb);
3281                         return LDB_ERR_OPERATIONS_ERROR;
3282                 }
3283                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3284                 if (la_entry->la == NULL) {
3285                         talloc_free(la_entry);
3286                         ldb_oom(ldb);
3287                         return LDB_ERR_OPERATIONS_ERROR;
3288                 }
3289                 *la_entry->la = ar->objs->linked_attributes[i];
3290
3291                 /* we need to steal the non-scalars so they stay
3292                    around until the end of the transaction */
3293                 talloc_steal(la_entry->la, la_entry->la->identifier);
3294                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3295
3296                 DLIST_ADD(replmd_private->la_list, la_entry);
3297         }
3298
3299         return replmd_replicated_apply_next(ar);
3300 }
3301
3302 /*
3303   process one linked attribute structure
3304  */
3305 static int replmd_process_linked_attribute(struct ldb_module *module,
3306                                            struct la_entry *la_entry)
3307 {
3308         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3309         struct ldb_context *ldb = ldb_module_get_ctx(module);
3310         struct dsdb_schema *schema = dsdb_get_schema(ldb);
3311         struct ldb_message *msg;
3312         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3313         int ret;
3314         const struct dsdb_attribute *attr;
3315         struct dsdb_dn *dsdb_dn;
3316         uint64_t seq_num = 0;
3317         struct drsuapi_DsReplicaAttribute drs;
3318         struct drsuapi_DsAttributeValue val;
3319         struct ldb_message_element new_el, *old_el;
3320         WERROR status;
3321         time_t t = time(NULL);
3322         struct ldb_result *res;
3323         const char *attrs[2];
3324         struct parsed_dn *pdn_list, *pdn;
3325         struct GUID guid;
3326         NTSTATUS ntstatus;
3327         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3328         const struct GUID *our_invocation_id;
3329
3330         drs.value_ctr.num_values = 1;
3331         drs.value_ctr.values = &val;
3332         val.blob = la->value.blob;
3333
3334 /*
3335 linked_attributes[0]:
3336      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3337         identifier               : *
3338             identifier: struct drsuapi_DsReplicaObjectIdentifier
3339                 __ndr_size               : 0x0000003a (58)
3340                 __ndr_size_sid           : 0x00000000 (0)
3341                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3342                 sid                      : S-0-0
3343                 __ndr_size_dn            : 0x00000000 (0)
3344                 dn                       : ''
3345         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3346         value: struct drsuapi_DsAttributeValue
3347             __ndr_size               : 0x0000007e (126)
3348             blob                     : *
3349                 blob                     : DATA_BLOB length=126
3350         flags                    : 0x00000001 (1)
3351                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3352         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3353         meta_data: struct drsuapi_DsReplicaMetaData
3354             version                  : 0x00000015 (21)
3355             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3356             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3357             originating_usn          : 0x000000000001e19c (123292)
3358
3359 (for cases where the link is to a normal DN)
3360      &target: struct drsuapi_DsReplicaObjectIdentifier3
3361         __ndr_size               : 0x0000007e (126)
3362         __ndr_size_sid           : 0x0000001c (28)
3363         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3364         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3365         __ndr_size_dn            : 0x00000022 (34)
3366         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3367  */
3368
3369         /* find the attribute being modified */
3370         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3371         if (attr == NULL) {
3372                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3373                 talloc_free(tmp_ctx);
3374                 return LDB_ERR_OPERATIONS_ERROR;
3375         }
3376
3377         attrs[0] = attr->lDAPDisplayName;
3378         attrs[1] = NULL;
3379
3380         /* get the existing message from the db for the object with
3381            this GUID, returning attribute being modified. We will then
3382            use this msg as the basis for a modify call */
3383         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3384                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3385                                  DSDB_SEARCH_SHOW_DELETED |
3386                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3387                                  DSDB_SEARCH_REVEAL_INTERNALS,
3388                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3389         if (ret != LDB_SUCCESS) {
3390                 talloc_free(tmp_ctx);
3391                 return ret;
3392         }
3393         if (res->count != 1) {
3394                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3395                                        GUID_string(tmp_ctx, &la->identifier->guid));
3396                 talloc_free(tmp_ctx);
3397                 return LDB_ERR_NO_SUCH_OBJECT;
3398         }
3399         msg = res->msgs[0];
3400
3401         if (msg->num_elements == 0) {
3402                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3403                 if (ret != LDB_SUCCESS) {
3404                         ldb_module_oom(module);
3405                         talloc_free(tmp_ctx);
3406                         return LDB_ERR_OPERATIONS_ERROR;
3407                 }
3408         } else {
3409                 old_el = &msg->elements[0];
3410                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3411         }
3412
3413         /* parse the existing links */
3414         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3415         if (ret != LDB_SUCCESS) {
3416                 talloc_free(tmp_ctx);
3417                 return ret;
3418         }
3419
3420         /* get our invocationId */
3421         our_invocation_id = samdb_ntds_invocation_id(ldb);
3422         if (!our_invocation_id) {
3423                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3424                 talloc_free(tmp_ctx);
3425                 return LDB_ERR_OPERATIONS_ERROR;
3426         }
3427
3428         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, our_invocation_id);
3429         if (ret != LDB_SUCCESS) {
3430                 talloc_free(tmp_ctx);
3431                 return ret;
3432         }
3433
3434         status = attr->syntax->drsuapi_to_ldb(ldb, schema, attr, &drs, tmp_ctx, &new_el);
3435         if (!W_ERROR_IS_OK(status)) {
3436                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s\n",
3437                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3438                 return LDB_ERR_OPERATIONS_ERROR;
3439         }
3440
3441         if (new_el.num_values != 1) {
3442                 ldb_asprintf_errstring(ldb, "Failed to find value in linked attribute blob for %s on %s\n",
3443                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3444                 return LDB_ERR_OPERATIONS_ERROR;
3445         }
3446
3447         dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &new_el.values[0], attr->syntax->ldap_oid);
3448         if (!dsdb_dn) {
3449                 ldb_asprintf_errstring(ldb, "Failed to parse DN in linked attribute blob for %s on %s\n",
3450                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3451                 return LDB_ERR_OPERATIONS_ERROR;
3452         }
3453
3454         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3455         if (!NT_STATUS_IS_OK(ntstatus)) {
3456                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s\n",
3457                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3458                 return LDB_ERR_OPERATIONS_ERROR;
3459         }
3460
3461         /* see if this link already exists */
3462         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid);
3463         if (pdn != NULL) {
3464                 /* see if this update is newer than what we have already */
3465                 struct GUID invocation_id = GUID_zero();
3466                 uint32_t version = 0;
3467                 NTTIME change_time = 0;
3468                 bool was_active = ldb_dn_get_extended_component(pdn->dsdb_dn->dn, "DELETED") == NULL;
3469
3470                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3471                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3472                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3473
3474                 if (!replmd_update_is_newer(&invocation_id,
3475                                             &la->meta_data.originating_invocation_id,
3476                                             version,
3477                                             la->meta_data.version,
3478                                             change_time,
3479                                             la->meta_data.originating_change_time)) {
3480                         DEBUG(1,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3481                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3482                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3483                         talloc_free(tmp_ctx);
3484                         return LDB_SUCCESS;
3485                 }
3486
3487                 /* get a seq_num for this change */
3488                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3489                 if (ret != LDB_SUCCESS) {
3490                         talloc_free(tmp_ctx);
3491                         return ret;
3492                 }
3493
3494                 if (was_active) {
3495                         /* remove the existing backlink */
3496                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3497                         if (ret != LDB_SUCCESS) {
3498                                 talloc_free(tmp_ctx);
3499                                 return ret;
3500                         }
3501                 }
3502
3503                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3504                                            &la->meta_data.originating_invocation_id,
3505                                            la->meta_data.originating_usn, seq_num,
3506                                            la->meta_data.originating_change_time,
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->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3542                 if (ret != LDB_SUCCESS) {
3543                         talloc_free(tmp_ctx);
3544                         return ret;
3545                 }
3546
3547                 if (active) {
3548                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3549                                                   true, attr, false);
3550                         if (ret != LDB_SUCCESS) {
3551                                 talloc_free(tmp_ctx);
3552                                 return ret;
3553                         }
3554                 }
3555         }
3556
3557         /* we only change whenChanged and uSNChanged if the seq_num
3558            has changed */
3559         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3560                 talloc_free(tmp_ctx);
3561                 return LDB_ERR_OPERATIONS_ERROR;
3562         }
3563
3564         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3565                 talloc_free(tmp_ctx);
3566                 return LDB_ERR_OPERATIONS_ERROR;
3567         }
3568
3569         ret = dsdb_module_modify(module, msg, 0);
3570         if (ret != LDB_SUCCESS) {
3571                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s' %s\n",
3572                           ldb_errstring(ldb),
3573                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
3574                 talloc_free(tmp_ctx);
3575                 return ret;
3576         }
3577
3578         talloc_free(tmp_ctx);
3579
3580         return ret;
3581 }
3582
3583 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
3584 {
3585         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
3586                 return replmd_extended_replicated_objects(module, req);
3587         }
3588
3589         return ldb_next_request(module, req);
3590 }
3591
3592
3593 /*
3594   we hook into the transaction operations to allow us to
3595   perform the linked attribute updates at the end of the whole
3596   transaction. This allows a forward linked attribute to be created
3597   before the object is created. During a vampire, w2k8 sends us linked
3598   attributes before the objects they are part of.
3599  */
3600 static int replmd_start_transaction(struct ldb_module *module)
3601 {
3602         /* create our private structure for this transaction */
3603         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
3604                                                                 struct replmd_private);
3605         replmd_txn_cleanup(replmd_private);
3606
3607         /* free any leftover mod_usn records from cancelled
3608            transactions */
3609         while (replmd_private->ncs) {
3610                 struct nc_entry *e = replmd_private->ncs;
3611                 DLIST_REMOVE(replmd_private->ncs, e);
3612                 talloc_free(e);
3613         }
3614
3615         return ldb_next_start_trans(module);
3616 }
3617
3618 /*
3619   on prepare commit we loop over our queued la_context structures and
3620   apply each of them
3621  */
3622 static int replmd_prepare_commit(struct ldb_module *module)
3623 {
3624         struct replmd_private *replmd_private =
3625                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3626         struct la_entry *la, *prev;
3627         struct la_backlink *bl;
3628         int ret;
3629
3630         /* walk the list backwards, to do the first entry first, as we
3631          * added the entries with DLIST_ADD() which puts them at the
3632          * start of the list */
3633         for (la = replmd_private->la_list; la && la->next; la=la->next) ;
3634
3635         for (; la; la=prev) {
3636                 prev = la->prev;
3637                 DLIST_REMOVE(replmd_private->la_list, la);
3638                 ret = replmd_process_linked_attribute(module, la);
3639                 if (ret != LDB_SUCCESS) {
3640                         replmd_txn_cleanup(replmd_private);
3641                         return ret;
3642                 }
3643         }
3644
3645         /* process our backlink list, creating and deleting backlinks
3646            as necessary */
3647         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
3648                 ret = replmd_process_backlink(module, bl);
3649                 if (ret != LDB_SUCCESS) {
3650                         replmd_txn_cleanup(replmd_private);
3651                         return ret;
3652                 }
3653         }
3654
3655         replmd_txn_cleanup(replmd_private);
3656
3657         /* possibly change @REPLCHANGED */
3658         ret = replmd_notify_store(module);
3659         if (ret != LDB_SUCCESS) {
3660                 return ret;
3661         }
3662
3663         return ldb_next_prepare_commit(module);
3664 }
3665
3666 static int replmd_del_transaction(struct ldb_module *module)
3667 {
3668         struct replmd_private *replmd_private =
3669                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3670         replmd_txn_cleanup(replmd_private);
3671
3672         return ldb_next_del_trans(module);
3673 }
3674
3675
3676 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
3677         .name          = "repl_meta_data",
3678         .init_context      = replmd_init,
3679         .add               = replmd_add,
3680         .modify            = replmd_modify,
3681         .rename            = replmd_rename,
3682         .del               = replmd_delete,
3683         .extended          = replmd_extended,
3684         .start_transaction = replmd_start_transaction,
3685         .prepare_commit    = replmd_prepare_commit,
3686         .del_transaction   = replmd_del_transaction,
3687 };