source4/dsdb/samdb/ldb_modules/repl_meta_data.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2004-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  *  Name: ldb
  25  *
  26  *  Component: ldb repl_meta_data module
  27  *
  28  *  Description: - add a unique objectGUID onto every new record,
  29  *               - handle whenCreated, whenChanged timestamps
  30  *               - handle uSNCreated, uSNChanged numbers
  31  *               - handle replPropertyMetaData attribute
  32  *
  33  *  Author: Simo Sorce
  34  *  Author: Stefan Metzmacher
  35  */
  36
  37 #include "includes.h"
  38 #include "ldb_module.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "dsdb/common/proto.h"
  41 #include "../libds/common/flags.h"
  42 #include "librpc/gen_ndr/ndr_misc.h"
  43 #include "librpc/gen_ndr/ndr_drsuapi.h"
  44 #include "librpc/gen_ndr/ndr_drsblobs.h"
  45 #include "param/param.h"
  46 #include "libcli/security/dom_sid.h"
  47 #include "lib/util/dlinklist.h"
  48 #include "dsdb/samdb/ldb_modules/util.h"
  49 #include "lib/util/binsearch.h"
  50 #include "libcli/security/security.h"
  51 #include "lib/util/tsort.h"
  52
  53 #define W2K3_LINKED_ATTRIBUTES 1
  54
  55 struct replmd_private {
  56         TALLOC_CTX *la_ctx;
  57         struct la_entry *la_list;
  58         TALLOC_CTX *bl_ctx;
  59         struct la_backlink *la_backlinks;
  60         struct nc_entry {
  61                 struct nc_entry *prev, *next;
  62                 struct ldb_dn *dn;
  63                 uint64_t mod_usn;
  64                 uint64_t mod_usn_urgent;
  65         } *ncs;
  66 };
  67
  68 struct la_entry {
  69         struct la_entry *next, *prev;
  70         struct drsuapi_DsReplicaLinkedAttribute *la;
  71 };
  72
  73 struct replmd_replicated_request {
  74         struct ldb_module *module;
  75         struct ldb_request *req;
  76
  77         const struct dsdb_schema *schema;
  78
  79         /* the controls we pass down */
  80         struct ldb_control **controls;
  81
  82         /* details for the mode where we apply a bunch of inbound replication meessages */
  83         bool apply_mode;
  84         uint32_t index_current;
  85         struct dsdb_extended_replicated_objects *objs;
  86
  87         struct ldb_message *search_msg;
  88
  89         uint64_t seq_num;
  90         bool is_urgent;
  91 };
  92
  93 enum urgent_situation {
  94         REPL_URGENT_ON_CREATE = 1,
  95         REPL_URGENT_ON_UPDATE = 2,
  96         REPL_URGENT_ON_DELETE = 4
  97 };
  98
  99
 100 static const struct {
 101         const char *update_name;
 102         enum urgent_situation repl_situation;
 103 } urgent_objects[] = {
 104                 {"nTDSDSA", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 105                 {"crossRef", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 106                 {"attributeSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 107                 {"classSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 108                 {"secret", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 109                 {"rIDManager", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 110                 {NULL, 0}
 111 };
 112
 113 /* Attributes looked for when updating or deleting, to check for a urgent replication needed */
 114 static const char *urgent_attrs[] = {
 115                 "lockoutTime",
 116                 "pwdLastSet",
 117                 "userAccountControl",
 118                 NULL
 119 };
 120
 121
 122 static bool replmd_check_urgent_objectclass(const struct ldb_message_element *objectclass_el,
 123                                         enum urgent_situation situation)
 124 {
 125         int i, j;
 126         for (i=0; urgent_objects[i].update_name; i++) {
 127
 128                 if ((situation & urgent_objects[i].repl_situation) == 0) {
 129                         continue;
 130                 }
 131
 132                 for (j=0; j<objectclass_el->num_values; j++) {
 133                         const struct ldb_val *v = &objectclass_el->values[j];
 134                         if (ldb_attr_cmp((const char *)v->data, urgent_objects[i].update_name) == 0) {
 135                                 return true;
 136                         }
 137                 }
 138         }
 139         return false;
 140 }
 141
 142 static bool replmd_check_urgent_attribute(const struct ldb_message_element *el)
 143 {
 144         if (ldb_attr_in_list(urgent_attrs, el->name)) {
 145                 return true;
 146         }
 147         return false;
 148 }
 149
 150
 151 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
 152
 153 /*
 154   initialise the module
 155   allocate the private structure and build the list
 156   of partition DNs for use by replmd_notify()
 157  */
 158 static int replmd_init(struct ldb_module *module)
 159 {
 160         struct replmd_private *replmd_private;
 161         struct ldb_context *ldb = ldb_module_get_ctx(module);
 162
 163         replmd_private = talloc_zero(module, struct replmd_private);
 164         if (replmd_private == NULL) {
 165                 ldb_oom(ldb);
 166                 return LDB_ERR_OPERATIONS_ERROR;
 167         }
 168         ldb_module_set_private(module, replmd_private);
 169
 170         return ldb_next_init(module);
 171 }
 172
 173 /*
 174   cleanup our per-transaction contexts
 175  */
 176 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 177 {
 178         talloc_free(replmd_private->la_ctx);
 179         replmd_private->la_list = NULL;
 180         replmd_private->la_ctx = NULL;
 181
 182         talloc_free(replmd_private->bl_ctx);
 183         replmd_private->la_backlinks = NULL;
 184         replmd_private->bl_ctx = NULL;
 185 }
 186
 187
 188 struct la_backlink {
 189         struct la_backlink *next, *prev;
 190         const char *attr_name;
 191         struct GUID forward_guid, target_guid;
 192         bool active;
 193 };
 194
 195 /*
 196   process a backlinks we accumulated during a transaction, adding and
 197   deleting the backlinks from the target objects
 198  */
 199 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl)
 200 {
 201         struct ldb_dn *target_dn, *source_dn;
 202         int ret;
 203         struct ldb_context *ldb = ldb_module_get_ctx(module);
 204         struct ldb_message *msg;
 205         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 206         char *dn_string;
 207
 208         /*
 209           - find DN of target
 210           - find DN of source
 211           - construct ldb_message
 212               - either an add or a delete
 213          */
 214         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn);
 215         if (ret != LDB_SUCCESS) {
 216                 ldb_asprintf_errstring(ldb, "Failed to find target DN for linked attribute with GUID %s\n",
 217                                        GUID_string(bl, &bl->target_guid));
 218                 talloc_free(tmp_ctx);
 219                 return ret;
 220         }
 221
 222         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
 223         if (ret != LDB_SUCCESS) {
 224                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 225                                        GUID_string(bl, &bl->forward_guid));
 226                 talloc_free(tmp_ctx);
 227                 return ret;
 228         }
 229
 230         msg = ldb_msg_new(tmp_ctx);
 231         if (msg == NULL) {
 232                 ldb_module_oom(module);
 233                 talloc_free(tmp_ctx);
 234                 return LDB_ERR_OPERATIONS_ERROR;
 235         }
 236
 237         /* construct a ldb_message for adding/deleting the backlink */
 238         msg->dn = target_dn;
 239         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 240         if (!dn_string) {
 241                 ldb_module_oom(module);
 242                 talloc_free(tmp_ctx);
 243                 return LDB_ERR_OPERATIONS_ERROR;
 244         }
 245         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 246         if (ret != LDB_SUCCESS) {
 247                 talloc_free(tmp_ctx);
 248                 return ret;
 249         }
 250         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 251
 252         ret = dsdb_module_modify(module, msg, 0);
 253         if (ret != LDB_SUCCESS) {
 254                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 255                                        bl->active?"add":"remove",
 256                                        ldb_dn_get_linearized(source_dn),
 257                                        ldb_dn_get_linearized(target_dn),
 258                                        ldb_errstring(ldb));
 259                 talloc_free(tmp_ctx);
 260                 return ret;
 261         }
 262         talloc_free(tmp_ctx);
 263         return ret;
 264 }
 265
 266 /*
 267   add a backlink to the list of backlinks to add/delete in the prepare
 268   commit
 269  */
 270 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 271                                struct GUID *forward_guid, struct GUID *target_guid,
 272                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 273 {
 274         const struct dsdb_attribute *target_attr;
 275         struct la_backlink *bl;
 276         struct replmd_private *replmd_private =
 277                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 278
 279         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 280         if (!target_attr) {
 281                 /*
 282                  * windows 2003 has a broken schema where the
 283                  * definition of msDS-IsDomainFor is missing (which is
 284                  * supposed to be the backlink of the
 285                  * msDS-HasDomainNCs attribute
 286                  */
 287                 return LDB_SUCCESS;
 288         }
 289
 290         /* see if its already in the list */
 291         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 292                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 293                     GUID_equal(target_guid, &bl->target_guid) &&
 294                     (target_attr->lDAPDisplayName == bl->attr_name ||
 295                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 296                         break;
 297                 }
 298         }
 299
 300         if (bl) {
 301                 /* we found an existing one */
 302                 if (bl->active == active) {
 303                         return LDB_SUCCESS;
 304                 }
 305                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 306                 talloc_free(bl);
 307                 return LDB_SUCCESS;
 308         }
 309
 310         if (replmd_private->bl_ctx == NULL) {
 311                 replmd_private->bl_ctx = talloc_new(replmd_private);
 312                 if (replmd_private->bl_ctx == NULL) {
 313                         ldb_module_oom(module);
 314                         return LDB_ERR_OPERATIONS_ERROR;
 315                 }
 316         }
 317
 318         /* its a new one */
 319         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 320         if (bl == NULL) {
 321                 ldb_module_oom(module);
 322                 return LDB_ERR_OPERATIONS_ERROR;
 323         }
 324
 325         /* Ensure the schema does not go away before the bl->attr_name is used */
 326         if (!talloc_reference(bl, schema)) {
 327                 talloc_free(bl);
 328                 ldb_module_oom(module);
 329                 return LDB_ERR_OPERATIONS_ERROR;
 330         }
 331
 332         bl->attr_name = target_attr->lDAPDisplayName;
 333         bl->forward_guid = *forward_guid;
 334         bl->target_guid = *target_guid;
 335         bl->active = active;
 336
 337         /* the caller may ask for this backlink to be processed
 338            immediately */
 339         if (immediate) {
 340                 int ret = replmd_process_backlink(module, bl);
 341                 talloc_free(bl);
 342                 return ret;
 343         }
 344
 345         DLIST_ADD(replmd_private->la_backlinks, bl);
 346
 347         return LDB_SUCCESS;
 348 }
 349
 350
 351 /*
 352  * Callback for most write operations in this module:
 353  *
 354  * notify the repl task that a object has changed. The notifies are
 355  * gathered up in the replmd_private structure then written to the
 356  * @REPLCHANGED object in each partition during the prepare_commit
 357  */
 358 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 359 {
 360         int ret;
 361         struct replmd_replicated_request *ac =
 362                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 363         struct replmd_private *replmd_private =
 364                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 365         struct nc_entry *modified_partition;
 366         struct ldb_control *partition_ctrl;
 367         const struct dsdb_control_current_partition *partition;
 368
 369         struct ldb_control **controls;
 370
 371         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 372
 373         /* Remove the 'partition' control from what we pass up the chain */
 374         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 375
 376         if (ares->error != LDB_SUCCESS) {
 377                 return ldb_module_done(ac->req, controls,
 378                                         ares->response, ares->error);
 379         }
 380
 381         if (ares->type != LDB_REPLY_DONE) {
 382                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 383                 return ldb_module_done(ac->req, NULL,
 384                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 385         }
 386
 387         if (!partition_ctrl) {
 388                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 389                 return ldb_module_done(ac->req, NULL,
 390                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 391         }
 392
 393         partition = talloc_get_type_abort(partition_ctrl->data,
 394                                     struct dsdb_control_current_partition);
 395
 396         if (ac->seq_num > 0) {
 397                 for (modified_partition = replmd_private->ncs; modified_partition;
 398                      modified_partition = modified_partition->next) {
 399                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 400                                 break;
 401                         }
 402                 }
 403
 404                 if (modified_partition == NULL) {
 405                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 406                         if (!modified_partition) {
 407                                 ldb_oom(ldb_module_get_ctx(ac->module));
 408                                 return ldb_module_done(ac->req, NULL,
 409                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 410                         }
 411                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 412                         if (!modified_partition->dn) {
 413                                 ldb_oom(ldb_module_get_ctx(ac->module));
 414                                 return ldb_module_done(ac->req, NULL,
 415                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 416                         }
 417                         DLIST_ADD(replmd_private->ncs, modified_partition);
 418                 }
 419
 420                 if (ac->seq_num > modified_partition->mod_usn) {
 421                         modified_partition->mod_usn = ac->seq_num;
 422                         if (ac->is_urgent) {
 423                                 modified_partition->mod_usn_urgent = ac->seq_num;
 424                         }
 425                 }
 426         }
 427
 428         if (ac->apply_mode) {
 429                 talloc_free(ares);
 430                 ac->index_current++;
 431
 432                 ret = replmd_replicated_apply_next(ac);
 433                 if (ret != LDB_SUCCESS) {
 434                         return ldb_module_done(ac->req, NULL, NULL, ret);
 435                 }
 436                 return ret;
 437         } else {
 438                 /* free the partition control container here, for the
 439                  * common path.  Other cases will have it cleaned up
 440                  * eventually with the ares */
 441                 talloc_free(partition_ctrl);
 442                 return ldb_module_done(ac->req,
 443                                        controls_except_specified(controls, ares, partition_ctrl),
 444                                        ares->response, LDB_SUCCESS);
 445         }
 446 }
 447
 448
 449 /*
 450  * update a @REPLCHANGED record in each partition if there have been
 451  * any writes of replicated data in the partition
 452  */
 453 static int replmd_notify_store(struct ldb_module *module)
 454 {
 455         struct replmd_private *replmd_private =
 456                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 457
 458         while (replmd_private->ncs) {
 459                 int ret;
 460                 struct nc_entry *modified_partition = replmd_private->ncs;
 461
 462                 ret = dsdb_module_save_partition_usn(module, modified_partition->dn,
 463                                                      modified_partition->mod_usn,
 464                                                      modified_partition->mod_usn_urgent);
 465                 if (ret != LDB_SUCCESS) {
 466                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 467                                  ldb_dn_get_linearized(modified_partition->dn)));
 468                         return ret;
 469                 }
 470                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 471                 talloc_free(modified_partition);
 472         }
 473
 474         return LDB_SUCCESS;
 475 }
 476
 477
 478 /*
 479   created a replmd_replicated_request context
 480  */
 481 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 482                                                          struct ldb_request *req)
 483 {
 484         struct ldb_context *ldb;
 485         struct replmd_replicated_request *ac;
 486
 487         ldb = ldb_module_get_ctx(module);
 488
 489         ac = talloc_zero(req, struct replmd_replicated_request);
 490         if (ac == NULL) {
 491                 ldb_oom(ldb);
 492                 return NULL;
 493         }
 494
 495         ac->module = module;
 496         ac->req = req;
 497
 498         ac->schema = dsdb_get_schema(ldb, ac);
 499         if (!ac->schema) {
 500                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 501                               "replmd_modify: no dsdb_schema loaded");
 502                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 503                 return NULL;
 504         }
 505
 506         return ac;
 507 }
 508
 509 /*
 510   add a time element to a record
 511 */
 512 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 513 {
 514         struct ldb_message_element *el;
 515         char *s;
 516
 517         if (ldb_msg_find_element(msg, attr) != NULL) {
 518                 return LDB_SUCCESS;
 519         }
 520
 521         s = ldb_timestring(msg, t);
 522         if (s == NULL) {
 523                 return LDB_ERR_OPERATIONS_ERROR;
 524         }
 525
 526         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 527                 return LDB_ERR_OPERATIONS_ERROR;
 528         }
 529
 530         el = ldb_msg_find_element(msg, attr);
 531         /* always set as replace. This works because on add ops, the flag
 532            is ignored */
 533         el->flags = LDB_FLAG_MOD_REPLACE;
 534
 535         return LDB_SUCCESS;
 536 }
 537
 538 /*
 539   add a uint64_t element to a record
 540 */
 541 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 542 {
 543         struct ldb_message_element *el;
 544
 545         if (ldb_msg_find_element(msg, attr) != NULL) {
 546                 return LDB_SUCCESS;
 547         }
 548
 549         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 550                 return LDB_ERR_OPERATIONS_ERROR;
 551         }
 552
 553         el = ldb_msg_find_element(msg, attr);
 554         /* always set as replace. This works because on add ops, the flag
 555            is ignored */
 556         el->flags = LDB_FLAG_MOD_REPLACE;
 557
 558         return LDB_SUCCESS;
 559 }
 560
 561 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 562                                                    const struct replPropertyMetaData1 *m2,
 563                                                    const uint32_t *rdn_attid)
 564 {
 565         if (m1->attid == m2->attid) {
 566                 return 0;
 567         }
 568
 569         /*
 570          * the rdn attribute should be at the end!
 571          * so we need to return a value greater than zero
 572          * which means m1 is greater than m2
 573          */
 574         if (m1->attid == *rdn_attid) {
 575                 return 1;
 576         }
 577
 578         /*
 579          * the rdn attribute should be at the end!
 580          * so we need to return a value less than zero
 581          * which means m2 is greater than m1
 582          */
 583         if (m2->attid == *rdn_attid) {
 584                 return -1;
 585         }
 586
 587         return m1->attid > m2->attid ? 1 : -1;
 588 }
 589
 590 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 591                                                 const struct dsdb_schema *schema,
 592                                                 struct ldb_dn *dn)
 593 {
 594         const char *rdn_name;
 595         const struct dsdb_attribute *rdn_sa;
 596
 597         rdn_name = ldb_dn_get_rdn_name(dn);
 598         if (!rdn_name) {
 599                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 600                 return LDB_ERR_OPERATIONS_ERROR;
 601         }
 602
 603         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 604         if (rdn_sa == NULL) {
 605                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 606                 return LDB_ERR_OPERATIONS_ERROR;
 607         }
 608
 609         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 610                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 611
 612         LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
 613
 614         return LDB_SUCCESS;
 615 }
 616
 617 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 618                                                  const struct ldb_message_element *e2,
 619                                                  const struct dsdb_schema *schema)
 620 {
 621         const struct dsdb_attribute *a1;
 622         const struct dsdb_attribute *a2;
 623
 624         /*
 625          * TODO: make this faster by caching the dsdb_attribute pointer
 626          *       on the ldb_messag_element
 627          */
 628
 629         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 630         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 631
 632         /*
 633          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 634          *       in the schema
 635          */
 636         if (!a1 || !a2) {
 637                 return strcasecmp(e1->name, e2->name);
 638         }
 639         if (a1->attributeID_id == a2->attributeID_id) {
 640                 return 0;
 641         }
 642         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 643 }
 644
 645 static void replmd_ldb_message_sort(struct ldb_message *msg,
 646                                     const struct dsdb_schema *schema)
 647 {
 648         LDB_TYPESAFE_QSORT(msg->elements, msg->num_elements, schema, replmd_ldb_message_element_attid_sort);
 649 }
 650
 651 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 652                                const struct GUID *invocation_id, uint64_t seq_num,
 653                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 654
 655
 656 /*
 657   fix up linked attributes in replmd_add.
 658   This involves setting up the right meta-data in extended DN
 659   components, and creating backlinks to the object
 660  */
 661 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 662                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 663                              struct GUID *guid, const struct dsdb_attribute *sa)
 664 {
 665         unsigned int i;
 666         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 667         struct ldb_context *ldb = ldb_module_get_ctx(module);
 668
 669         /* We will take a reference to the schema in replmd_add_backlink */
 670         const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
 671         NTTIME now;
 672
 673         unix_to_nt_time(&now, t);
 674
 675         for (i=0; i<el->num_values; i++) {
 676                 struct ldb_val *v = &el->values[i];
 677                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 678                 struct GUID target_guid;
 679                 NTSTATUS status;
 680                 int ret;
 681
 682                 /* note that the DN already has the extended
 683                    components from the extended_dn_store module */
 684                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 685                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 686                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid);
 687                         if (ret != LDB_SUCCESS) {
 688                                 talloc_free(tmp_ctx);
 689                                 return ret;
 690                         }
 691                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 692                         if (ret != LDB_SUCCESS) {
 693                                 talloc_free(tmp_ctx);
 694                                 return ret;
 695                         }
 696                 }
 697
 698                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 699                                           seq_num, seq_num, now, 0, false);
 700                 if (ret != LDB_SUCCESS) {
 701                         talloc_free(tmp_ctx);
 702                         return ret;
 703                 }
 704
 705                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 706                 if (ret != LDB_SUCCESS) {
 707                         talloc_free(tmp_ctx);
 708                         return ret;
 709                 }
 710         }
 711
 712         talloc_free(tmp_ctx);
 713         return LDB_SUCCESS;
 714 }
 715
 716
 717 /*
 718   intercept add requests
 719  */
 720 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 721 {
 722         struct ldb_context *ldb;
 723         struct ldb_control *control;
 724         struct replmd_replicated_request *ac;
 725         enum ndr_err_code ndr_err;
 726         struct ldb_request *down_req;
 727         struct ldb_message *msg;
 728         const DATA_BLOB *guid_blob;
 729         struct GUID guid;
 730         struct replPropertyMetaDataBlob nmd;
 731         struct ldb_val nmd_value;
 732         const struct GUID *our_invocation_id;
 733         time_t t = time(NULL);
 734         NTTIME now;
 735         char *time_str;
 736         int ret;
 737         unsigned int i;
 738         uint32_t ni=0;
 739         bool allow_add_guid = false;
 740         bool remove_current_guid = false;
 741         bool is_urgent = false;
 742         struct ldb_message_element *objectclass_el;
 743
 744         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 745         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 746         if (control) {
 747                 allow_add_guid = true;
 748         }
 749
 750         /* do not manipulate our control entries */
 751         if (ldb_dn_is_special(req->op.add.message->dn)) {
 752                 return ldb_next_request(module, req);
 753         }
 754
 755         ldb = ldb_module_get_ctx(module);
 756
 757         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 758
 759         ac = replmd_ctx_init(module, req);
 760         if (!ac) {
 761                 return LDB_ERR_OPERATIONS_ERROR;
 762         }
 763
 764         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 765         if ( guid_blob != NULL ) {
 766                 if( !allow_add_guid ) {
 767                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 768                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 769                         talloc_free(ac);
 770                         return LDB_ERR_UNWILLING_TO_PERFORM;
 771                 } else {
 772                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 773                         if ( !NT_STATUS_IS_OK(status)) {
 774                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 775                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 776                                 talloc_free(ac);
 777                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 778                         }
 779                         /* we remove this attribute as it can be a string and will not be treated
 780                         correctly and then we will readd it latter on in the good format*/
 781                         remove_current_guid = true;
 782                 }
 783         } else {
 784                 /* a new GUID */
 785                 guid = GUID_random();
 786         }
 787
 788         /* Get a sequence number from the backend */
 789         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 790         if (ret != LDB_SUCCESS) {
 791                 talloc_free(ac);
 792                 return ret;
 793         }
 794
 795         /* get our invocationId */
 796         our_invocation_id = samdb_ntds_invocation_id(ldb);
 797         if (!our_invocation_id) {
 798                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 799                               "replmd_add: unable to find invocationId\n");
 800                 talloc_free(ac);
 801                 return LDB_ERR_OPERATIONS_ERROR;
 802         }
 803
 804         /* we have to copy the message as the caller might have it as a const */
 805         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 806         if (msg == NULL) {
 807                 ldb_oom(ldb);
 808                 talloc_free(ac);
 809                 return LDB_ERR_OPERATIONS_ERROR;
 810         }
 811
 812         /* generated times */
 813         unix_to_nt_time(&now, t);
 814         time_str = ldb_timestring(msg, t);
 815         if (!time_str) {
 816                 ldb_oom(ldb);
 817                 talloc_free(ac);
 818                 return LDB_ERR_OPERATIONS_ERROR;
 819         }
 820         if (remove_current_guid) {
 821                 ldb_msg_remove_attr(msg,"objectGUID");
 822         }
 823
 824         /*
 825          * remove autogenerated attributes
 826          */
 827         ldb_msg_remove_attr(msg, "whenCreated");
 828         ldb_msg_remove_attr(msg, "whenChanged");
 829         ldb_msg_remove_attr(msg, "uSNCreated");
 830         ldb_msg_remove_attr(msg, "uSNChanged");
 831         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 832
 833         /*
 834          * readd replicated attributes
 835          */
 836         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 837         if (ret != LDB_SUCCESS) {
 838                 ldb_oom(ldb);
 839                 talloc_free(ac);
 840                 return ret;
 841         }
 842
 843         /* build the replication meta_data */
 844         ZERO_STRUCT(nmd);
 845         nmd.version             = 1;
 846         nmd.ctr.ctr1.count      = msg->num_elements;
 847         nmd.ctr.ctr1.array      = talloc_array(msg,
 848                                                struct replPropertyMetaData1,
 849                                                nmd.ctr.ctr1.count);
 850         if (!nmd.ctr.ctr1.array) {
 851                 ldb_oom(ldb);
 852                 talloc_free(ac);
 853                 return LDB_ERR_OPERATIONS_ERROR;
 854         }
 855
 856         for (i=0; i < msg->num_elements; i++) {
 857                 struct ldb_message_element *e = &msg->elements[i];
 858                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 859                 const struct dsdb_attribute *sa;
 860
 861                 if (e->name[0] == '@') continue;
 862
 863                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 864                 if (!sa) {
 865                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 866                                       "replmd_add: attribute '%s' not defined in schema\n",
 867                                       e->name);
 868                         talloc_free(ac);
 869                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 870                 }
 871
 872                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 873                         /* if the attribute is not replicated (0x00000001)
 874                          * or constructed (0x00000004) it has no metadata
 875                          */
 876                         continue;
 877                 }
 878
 879 #if W2K3_LINKED_ATTRIBUTES
 880                 if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 881                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 882                         if (ret != LDB_SUCCESS) {
 883                                 talloc_free(ac);
 884                                 return ret;
 885                         }
 886                         /* linked attributes are not stored in
 887                            replPropertyMetaData in FL above w2k */
 888                         continue;
 889                 }
 890 #endif
 891
 892                 m->attid                        = sa->attributeID_id;
 893                 m->version                      = 1;
 894                 m->originating_change_time      = now;
 895                 m->originating_invocation_id    = *our_invocation_id;
 896                 m->originating_usn              = ac->seq_num;
 897                 m->local_usn                    = ac->seq_num;
 898                 ni++;
 899         }
 900
 901         /* fix meta data count */
 902         nmd.ctr.ctr1.count = ni;
 903
 904         /*
 905          * sort meta data array, and move the rdn attribute entry to the end
 906          */
 907         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 908         if (ret != LDB_SUCCESS) {
 909                 talloc_free(ac);
 910                 return ret;
 911         }
 912
 913         /* generated NDR encoded values */
 914         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 915                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 916                                        &nmd,
 917                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 918         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 919                 ldb_oom(ldb);
 920                 talloc_free(ac);
 921                 return LDB_ERR_OPERATIONS_ERROR;
 922         }
 923
 924         /*
 925          * add the autogenerated values
 926          */
 927         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 928         if (ret != LDB_SUCCESS) {
 929                 ldb_oom(ldb);
 930                 talloc_free(ac);
 931                 return ret;
 932         }
 933         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 934         if (ret != LDB_SUCCESS) {
 935                 ldb_oom(ldb);
 936                 talloc_free(ac);
 937                 return ret;
 938         }
 939         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 940         if (ret != LDB_SUCCESS) {
 941                 ldb_oom(ldb);
 942                 talloc_free(ac);
 943                 return ret;
 944         }
 945         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 946         if (ret != LDB_SUCCESS) {
 947                 ldb_oom(ldb);
 948                 talloc_free(ac);
 949                 return ret;
 950         }
 951         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 952         if (ret != LDB_SUCCESS) {
 953                 ldb_oom(ldb);
 954                 talloc_free(ac);
 955                 return ret;
 956         }
 957
 958         /*
 959          * sort the attributes by attid before storing the object
 960          */
 961         replmd_ldb_message_sort(msg, ac->schema);
 962
 963         objectclass_el = ldb_msg_find_element(msg, "objectClass");
 964         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
 965                                                         REPL_URGENT_ON_CREATE);
 966
 967         ac->is_urgent = is_urgent;
 968         ret = ldb_build_add_req(&down_req, ldb, ac,
 969                                 msg,
 970                                 req->controls,
 971                                 ac, replmd_op_callback,
 972                                 req);
 973
 974         if (ret != LDB_SUCCESS) {
 975                 talloc_free(ac);
 976                 return ret;
 977         }
 978
 979         /* mark the control done */
 980         if (control) {
 981                 control->critical = 0;
 982         }
 983
 984         /* go on with the call chain */
 985         return ldb_next_request(module, down_req);
 986 }
 987
 988
 989 /*
 990  * update the replPropertyMetaData for one element
 991  */
 992 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 993                                       struct ldb_message *msg,
 994                                       struct ldb_message_element *el,
 995                                       struct ldb_message_element *old_el,
 996                                       struct replPropertyMetaDataBlob *omd,
 997                                       const struct dsdb_schema *schema,
 998                                       uint64_t *seq_num,
 999                                       const struct GUID *our_invocation_id,
1000                                       NTTIME now)
1001 {
1002         uint32_t i;
1003         const struct dsdb_attribute *a;
1004         struct replPropertyMetaData1 *md1;
1005
1006         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1007         if (a == NULL) {
1008                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1009                          el->name));
1010                 return LDB_ERR_OPERATIONS_ERROR;
1011         }
1012
1013         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1014                 return LDB_SUCCESS;
1015         }
1016
1017         /* if the attribute's value haven't changed then return LDB_SUCCESS     */
1018         if (old_el != NULL && ldb_msg_element_compare(el, old_el) == 0) {
1019                 return LDB_SUCCESS;
1020         }
1021
1022         for (i=0; i<omd->ctr.ctr1.count; i++) {
1023                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1024         }
1025
1026 #if W2K3_LINKED_ATTRIBUTES
1027         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1028                 /* linked attributes are not stored in
1029                    replPropertyMetaData in FL above w2k, but we do
1030                    raise the seqnum for the object  */
1031                 if (*seq_num == 0 &&
1032                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1033                         return LDB_ERR_OPERATIONS_ERROR;
1034                 }
1035                 return LDB_SUCCESS;
1036         }
1037 #endif
1038
1039         if (i == omd->ctr.ctr1.count) {
1040                 /* we need to add a new one */
1041                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1042                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1043                 if (omd->ctr.ctr1.array == NULL) {
1044                         ldb_oom(ldb);
1045                         return LDB_ERR_OPERATIONS_ERROR;
1046                 }
1047                 omd->ctr.ctr1.count++;
1048                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1049         }
1050
1051         /* Get a new sequence number from the backend. We only do this
1052          * if we have a change that requires a new
1053          * replPropertyMetaData element
1054          */
1055         if (*seq_num == 0) {
1056                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1057                 if (ret != LDB_SUCCESS) {
1058                         return LDB_ERR_OPERATIONS_ERROR;
1059                 }
1060         }
1061
1062         md1 = &omd->ctr.ctr1.array[i];
1063         md1->version++;
1064         md1->attid                     = a->attributeID_id;
1065         md1->originating_change_time   = now;
1066         md1->originating_invocation_id = *our_invocation_id;
1067         md1->originating_usn           = *seq_num;
1068         md1->local_usn                 = *seq_num;
1069
1070         return LDB_SUCCESS;
1071 }
1072
1073 /*
1074  * update the replPropertyMetaData object each time we modify an
1075  * object. This is needed for DRS replication, as the merge on the
1076  * client is based on this object
1077  */
1078 static int replmd_update_rpmd(struct ldb_module *module,
1079                               const struct dsdb_schema *schema,
1080                               struct ldb_message *msg, uint64_t *seq_num,
1081                               time_t t,
1082                               bool *is_urgent)
1083 {
1084         const struct ldb_val *omd_value;
1085         enum ndr_err_code ndr_err;
1086         struct replPropertyMetaDataBlob omd;
1087         unsigned int i;
1088         NTTIME now;
1089         const struct GUID *our_invocation_id;
1090         int ret;
1091         const char *attrs[] = { "replPropertyMetaData", "*", NULL };
1092         struct ldb_result *res;
1093         struct ldb_context *ldb;
1094         struct ldb_message_element *objectclass_el;
1095         enum urgent_situation situation;
1096
1097         ldb = ldb_module_get_ctx(module);
1098
1099         our_invocation_id = samdb_ntds_invocation_id(ldb);
1100         if (!our_invocation_id) {
1101                 /* this happens during an initial vampire while
1102                    updating the schema */
1103                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1104                 return LDB_SUCCESS;
1105         }
1106
1107         unix_to_nt_time(&now, t);
1108
1109         /* search for the existing replPropertyMetaDataBlob. We need
1110          * to use REVEAL and ask for DNs in storage format to support
1111          * the check for values being the same in
1112          * replmd_update_rpmd_element()
1113          */
1114         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
1115                                     DSDB_SEARCH_SHOW_DELETED |
1116                                     DSDB_SEARCH_SHOW_EXTENDED_DN |
1117                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1118                                     DSDB_SEARCH_REVEAL_INTERNALS);
1119         if (ret != LDB_SUCCESS || res->count != 1) {
1120                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1121                          ldb_dn_get_linearized(msg->dn)));
1122                 return LDB_ERR_OPERATIONS_ERROR;
1123         }
1124
1125         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1126          * otherwise we consider we are updating */
1127         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1128                 situation = REPL_URGENT_ON_DELETE;
1129         } else {
1130                 situation = REPL_URGENT_ON_UPDATE;
1131         }
1132
1133         objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1134         if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1135                                                         situation)) {
1136                 *is_urgent = true;
1137         }
1138
1139         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1140         if (!omd_value) {
1141                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1142                          ldb_dn_get_linearized(msg->dn)));
1143                 return LDB_ERR_OPERATIONS_ERROR;
1144         }
1145
1146         ndr_err = ndr_pull_struct_blob(omd_value, msg,
1147                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
1148                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1149         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1150                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1151                          ldb_dn_get_linearized(msg->dn)));
1152                 return LDB_ERR_OPERATIONS_ERROR;
1153         }
1154
1155         if (omd.version != 1) {
1156                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1157                          omd.version, ldb_dn_get_linearized(msg->dn)));
1158                 return LDB_ERR_OPERATIONS_ERROR;
1159         }
1160
1161         for (i=0; i<msg->num_elements; i++) {
1162                 struct ldb_message_element *old_el;
1163                 old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1164                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1165                                                  our_invocation_id, now);
1166                 if (ret != LDB_SUCCESS) {
1167                         return ret;
1168                 }
1169
1170                 if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1171                         *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1172                 }
1173
1174         }
1175
1176         /*
1177          * replmd_update_rpmd_element has done an update if the
1178          * seq_num is set
1179          */
1180         if (*seq_num != 0) {
1181                 struct ldb_val *md_value;
1182                 struct ldb_message_element *el;
1183
1184                 md_value = talloc(msg, struct ldb_val);
1185                 if (md_value == NULL) {
1186                         ldb_oom(ldb);
1187                         return LDB_ERR_OPERATIONS_ERROR;
1188                 }
1189
1190                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1191                 if (ret != LDB_SUCCESS) {
1192                         return ret;
1193                 }
1194
1195                 ndr_err = ndr_push_struct_blob(md_value, msg,
1196                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1197                                                &omd,
1198                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1199                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1200                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1201                                  ldb_dn_get_linearized(msg->dn)));
1202                         return LDB_ERR_OPERATIONS_ERROR;
1203                 }
1204
1205                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1206                 if (ret != LDB_SUCCESS) {
1207                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1208                                  ldb_dn_get_linearized(msg->dn)));
1209                         return ret;
1210                 }
1211
1212                 el->num_values = 1;
1213                 el->values = md_value;
1214         }
1215
1216         return LDB_SUCCESS;
1217 }
1218
1219 struct parsed_dn {
1220         struct dsdb_dn *dsdb_dn;
1221         struct GUID *guid;
1222         struct ldb_val *v;
1223 };
1224
1225 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1226 {
1227         return GUID_compare(pdn1->guid, pdn2->guid);
1228 }
1229
1230 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1231 {
1232         struct parsed_dn *ret;
1233         if (dn && GUID_all_zero(guid)) {
1234                 /* when updating a link using DRS, we sometimes get a
1235                    NULL GUID. We then need to try and match by DN */
1236                 int i;
1237                 for (i=0; i<count; i++) {
1238                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1239                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1240                                 return &pdn[i];
1241                         }
1242                 }
1243                 return NULL;
1244         }
1245         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1246         return ret;
1247 }
1248
1249 /*
1250   get a series of message element values as an array of DNs and GUIDs
1251   the result is sorted by GUID
1252  */
1253 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1254                           struct ldb_message_element *el, struct parsed_dn **pdn,
1255                           const char *ldap_oid)
1256 {
1257         unsigned int i;
1258         struct ldb_context *ldb = ldb_module_get_ctx(module);
1259
1260         if (el == NULL) {
1261                 *pdn = NULL;
1262                 return LDB_SUCCESS;
1263         }
1264
1265         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1266         if (!*pdn) {
1267                 ldb_module_oom(module);
1268                 return LDB_ERR_OPERATIONS_ERROR;
1269         }
1270
1271         for (i=0; i<el->num_values; i++) {
1272                 struct ldb_val *v = &el->values[i];
1273                 NTSTATUS status;
1274                 struct ldb_dn *dn;
1275                 struct parsed_dn *p;
1276
1277                 p = &(*pdn)[i];
1278
1279                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1280                 if (p->dsdb_dn == NULL) {
1281                         return LDB_ERR_INVALID_DN_SYNTAX;
1282                 }
1283
1284                 dn = p->dsdb_dn->dn;
1285
1286                 p->guid = talloc(*pdn, struct GUID);
1287                 if (p->guid == NULL) {
1288                         ldb_module_oom(module);
1289                         return LDB_ERR_OPERATIONS_ERROR;
1290                 }
1291
1292                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1293                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1294                         /* we got a DN without a GUID - go find the GUID */
1295                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1296                         if (ret != LDB_SUCCESS) {
1297                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1298                                                        ldb_dn_get_linearized(dn));
1299                                 return ret;
1300                         }
1301                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1302                         if (ret != LDB_SUCCESS) {
1303                                 return ret;
1304                         }
1305                 } else if (!NT_STATUS_IS_OK(status)) {
1306                         return LDB_ERR_OPERATIONS_ERROR;
1307                 }
1308
1309                 /* keep a pointer to the original ldb_val */
1310                 p->v = v;
1311         }
1312
1313         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1314
1315         return LDB_SUCCESS;
1316 }
1317
1318 /*
1319   build a new extended DN, including all meta data fields
1320
1321   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1322   RMD_ADDTIME         = originating_add_time
1323   RMD_INVOCID         = originating_invocation_id
1324   RMD_CHANGETIME      = originating_change_time
1325   RMD_ORIGINATING_USN = originating_usn
1326   RMD_LOCAL_USN       = local_usn
1327   RMD_VERSION         = version
1328  */
1329 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1330                                const struct GUID *invocation_id, uint64_t seq_num,
1331                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1332 {
1333         struct ldb_dn *dn = dsdb_dn->dn;
1334         const char *tstring, *usn_string, *flags_string;
1335         struct ldb_val tval;
1336         struct ldb_val iid;
1337         struct ldb_val usnv, local_usnv;
1338         struct ldb_val vers, flagsv;
1339         NTSTATUS status;
1340         int ret;
1341         const char *dnstring;
1342         char *vstring;
1343         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1344
1345         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1346         if (!tstring) {
1347                 return LDB_ERR_OPERATIONS_ERROR;
1348         }
1349         tval = data_blob_string_const(tstring);
1350
1351         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1352         if (!usn_string) {
1353                 return LDB_ERR_OPERATIONS_ERROR;
1354         }
1355         usnv = data_blob_string_const(usn_string);
1356
1357         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1358         if (!usn_string) {
1359                 return LDB_ERR_OPERATIONS_ERROR;
1360         }
1361         local_usnv = data_blob_string_const(usn_string);
1362
1363         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1364         if (!vstring) {
1365                 return LDB_ERR_OPERATIONS_ERROR;
1366         }
1367         vers = data_blob_string_const(vstring);
1368
1369         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1370         if (!NT_STATUS_IS_OK(status)) {
1371                 return LDB_ERR_OPERATIONS_ERROR;
1372         }
1373
1374         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1375         if (!flags_string) {
1376                 return LDB_ERR_OPERATIONS_ERROR;
1377         }
1378         flagsv = data_blob_string_const(flags_string);
1379
1380         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1381         if (ret != LDB_SUCCESS) return ret;
1382         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1383         if (ret != LDB_SUCCESS) return ret;
1384         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1385         if (ret != LDB_SUCCESS) return ret;
1386         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1387         if (ret != LDB_SUCCESS) return ret;
1388         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1389         if (ret != LDB_SUCCESS) return ret;
1390         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1391         if (ret != LDB_SUCCESS) return ret;
1392         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1393         if (ret != LDB_SUCCESS) return ret;
1394
1395         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1396         if (dnstring == NULL) {
1397                 return LDB_ERR_OPERATIONS_ERROR;
1398         }
1399         *v = data_blob_string_const(dnstring);
1400
1401         return LDB_SUCCESS;
1402 }
1403
1404 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1405                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1406                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1407                                 uint32_t version, bool deleted);
1408
1409 /*
1410   check if any links need upgrading from w2k format
1411  */
1412 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, const struct GUID *invocation_id)
1413 {
1414         uint32_t i;
1415         for (i=0; i<count; i++) {
1416                 NTSTATUS status;
1417                 uint32_t version;
1418                 int ret;
1419
1420                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1421                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1422                         continue;
1423                 }
1424
1425                 /* it's an old one that needs upgrading */
1426                 ret = replmd_update_la_val(dns, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1427                                            1, 1, 0, 0, false);
1428                 if (ret != LDB_SUCCESS) {
1429                         return ret;
1430                 }
1431         }
1432         return LDB_SUCCESS;
1433 }
1434
1435 /*
1436   update an extended DN, including all meta data fields
1437
1438   see replmd_build_la_val for value names
1439  */
1440 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1441                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1442                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1443                                 uint32_t version, bool deleted)
1444 {
1445         struct ldb_dn *dn = dsdb_dn->dn;
1446         const char *tstring, *usn_string, *flags_string;
1447         struct ldb_val tval;
1448         struct ldb_val iid;
1449         struct ldb_val usnv, local_usnv;
1450         struct ldb_val vers, flagsv;
1451         const struct ldb_val *old_addtime;
1452         uint32_t old_version;
1453         NTSTATUS status;
1454         int ret;
1455         const char *dnstring;
1456         char *vstring;
1457         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1458
1459         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1460         if (!tstring) {
1461                 return LDB_ERR_OPERATIONS_ERROR;
1462         }
1463         tval = data_blob_string_const(tstring);
1464
1465         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1466         if (!usn_string) {
1467                 return LDB_ERR_OPERATIONS_ERROR;
1468         }
1469         usnv = data_blob_string_const(usn_string);
1470
1471         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1472         if (!usn_string) {
1473                 return LDB_ERR_OPERATIONS_ERROR;
1474         }
1475         local_usnv = data_blob_string_const(usn_string);
1476
1477         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1478         if (!NT_STATUS_IS_OK(status)) {
1479                 return LDB_ERR_OPERATIONS_ERROR;
1480         }
1481
1482         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1483         if (!flags_string) {
1484                 return LDB_ERR_OPERATIONS_ERROR;
1485         }
1486         flagsv = data_blob_string_const(flags_string);
1487
1488         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1489         if (ret != LDB_SUCCESS) return ret;
1490
1491         /* get the ADDTIME from the original */
1492         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1493         if (old_addtime == NULL) {
1494                 old_addtime = &tval;
1495         }
1496         if (dsdb_dn != old_dsdb_dn) {
1497                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1498                 if (ret != LDB_SUCCESS) return ret;
1499         }
1500
1501         /* use our invocation id */
1502         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1503         if (ret != LDB_SUCCESS) return ret;
1504
1505         /* changetime is the current time */
1506         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1507         if (ret != LDB_SUCCESS) return ret;
1508
1509         /* update the USN */
1510         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1511         if (ret != LDB_SUCCESS) return ret;
1512
1513         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1514         if (ret != LDB_SUCCESS) return ret;
1515
1516         /* increase the version by 1 */
1517         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1518         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1519                 version = old_version+1;
1520         }
1521         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1522         vers = data_blob_string_const(vstring);
1523         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1524         if (ret != LDB_SUCCESS) return ret;
1525
1526         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1527         if (dnstring == NULL) {
1528                 return LDB_ERR_OPERATIONS_ERROR;
1529         }
1530         *v = data_blob_string_const(dnstring);
1531
1532         return LDB_SUCCESS;
1533 }
1534
1535 /*
1536   handle adding a linked attribute
1537  */
1538 static int replmd_modify_la_add(struct ldb_module *module,
1539                                 const struct dsdb_schema *schema,
1540                                 struct ldb_message *msg,
1541                                 struct ldb_message_element *el,
1542                                 struct ldb_message_element *old_el,
1543                                 const struct dsdb_attribute *schema_attr,
1544                                 uint64_t seq_num,
1545                                 time_t t,
1546                                 struct GUID *msg_guid)
1547 {
1548         unsigned int i;
1549         struct parsed_dn *dns, *old_dns;
1550         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1551         int ret;
1552         struct ldb_val *new_values = NULL;
1553         unsigned int num_new_values = 0;
1554         unsigned old_num_values = old_el?old_el->num_values:0;
1555         const struct GUID *invocation_id;
1556         struct ldb_context *ldb = ldb_module_get_ctx(module);
1557         NTTIME now;
1558
1559         unix_to_nt_time(&now, t);
1560
1561         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1562         if (ret != LDB_SUCCESS) {
1563                 talloc_free(tmp_ctx);
1564                 return ret;
1565         }
1566
1567         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1568         if (ret != LDB_SUCCESS) {
1569                 talloc_free(tmp_ctx);
1570                 return ret;
1571         }
1572
1573         invocation_id = samdb_ntds_invocation_id(ldb);
1574         if (!invocation_id) {
1575                 talloc_free(tmp_ctx);
1576                 return LDB_ERR_OPERATIONS_ERROR;
1577         }
1578
1579         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1580         if (ret != LDB_SUCCESS) {
1581                 talloc_free(tmp_ctx);
1582                 return ret;
1583         }
1584
1585         /* for each new value, see if it exists already with the same GUID */
1586         for (i=0; i<el->num_values; i++) {
1587                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1588                 if (p == NULL) {
1589                         /* this is a new linked attribute value */
1590                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1591                         if (new_values == NULL) {
1592                                 ldb_module_oom(module);
1593                                 talloc_free(tmp_ctx);
1594                                 return LDB_ERR_OPERATIONS_ERROR;
1595                         }
1596                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1597                                                   invocation_id, seq_num, seq_num, now, 0, false);
1598                         if (ret != LDB_SUCCESS) {
1599                                 talloc_free(tmp_ctx);
1600                                 return ret;
1601                         }
1602                         num_new_values++;
1603                 } else {
1604                         /* this is only allowed if the GUID was
1605                            previously deleted. */
1606                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1607
1608                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1609                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1610                                                        el->name, GUID_string(tmp_ctx, p->guid));
1611                                 talloc_free(tmp_ctx);
1612                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1613                         }
1614                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1615                                                    invocation_id, seq_num, seq_num, now, 0, false);
1616                         if (ret != LDB_SUCCESS) {
1617                                 talloc_free(tmp_ctx);
1618                                 return ret;
1619                         }
1620                 }
1621
1622                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1623                 if (ret != LDB_SUCCESS) {
1624                         talloc_free(tmp_ctx);
1625                         return ret;
1626                 }
1627         }
1628
1629         /* add the new ones on to the end of the old values, constructing a new el->values */
1630         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1631                                     struct ldb_val,
1632                                     old_num_values+num_new_values);
1633         if (el->values == NULL) {
1634                 ldb_module_oom(module);
1635                 return LDB_ERR_OPERATIONS_ERROR;
1636         }
1637
1638         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1639         el->num_values = old_num_values + num_new_values;
1640
1641         talloc_steal(msg->elements, el->values);
1642         talloc_steal(el->values, new_values);
1643
1644         talloc_free(tmp_ctx);
1645
1646         /* we now tell the backend to replace all existing values
1647            with the one we have constructed */
1648         el->flags = LDB_FLAG_MOD_REPLACE;
1649
1650         return LDB_SUCCESS;
1651 }
1652
1653
1654 /*
1655   handle deleting all active linked attributes
1656  */
1657 static int replmd_modify_la_delete(struct ldb_module *module,
1658                                    const struct dsdb_schema *schema,
1659                                    struct ldb_message *msg,
1660                                    struct ldb_message_element *el,
1661                                    struct ldb_message_element *old_el,
1662                                    const struct dsdb_attribute *schema_attr,
1663                                    uint64_t seq_num,
1664                                    time_t t,
1665                                    struct GUID *msg_guid)
1666 {
1667         unsigned int i;
1668         struct parsed_dn *dns, *old_dns;
1669         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1670         int ret;
1671         const struct GUID *invocation_id;
1672         struct ldb_context *ldb = ldb_module_get_ctx(module);
1673         NTTIME now;
1674
1675         unix_to_nt_time(&now, t);
1676
1677         /* check if there is nothing to delete */
1678         if ((!old_el || old_el->num_values == 0) &&
1679             el->num_values == 0) {
1680                 return LDB_SUCCESS;
1681         }
1682
1683         if (!old_el || old_el->num_values == 0) {
1684                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1685         }
1686
1687         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1688         if (ret != LDB_SUCCESS) {
1689                 talloc_free(tmp_ctx);
1690                 return ret;
1691         }
1692
1693         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1694         if (ret != LDB_SUCCESS) {
1695                 talloc_free(tmp_ctx);
1696                 return ret;
1697         }
1698
1699         invocation_id = samdb_ntds_invocation_id(ldb);
1700         if (!invocation_id) {
1701                 return LDB_ERR_OPERATIONS_ERROR;
1702         }
1703
1704         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, invocation_id);
1705         if (ret != LDB_SUCCESS) {
1706                 talloc_free(tmp_ctx);
1707                 return ret;
1708         }
1709
1710         el->values = NULL;
1711
1712         /* see if we are being asked to delete any links that
1713            don't exist or are already deleted */
1714         for (i=0; i<el->num_values; i++) {
1715                 struct parsed_dn *p = &dns[i];
1716                 struct parsed_dn *p2;
1717                 uint32_t rmd_flags;
1718
1719                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1720                 if (!p2) {
1721                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1722                                                el->name, GUID_string(tmp_ctx, p->guid));
1723                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1724                 }
1725                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1726                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1727                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1728                                                el->name, GUID_string(tmp_ctx, p->guid));
1729                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1730                 }
1731         }
1732
1733         /* for each new value, see if it exists already with the same GUID
1734            if it is not already deleted and matches the delete list then delete it
1735         */
1736         for (i=0; i<old_el->num_values; i++) {
1737                 struct parsed_dn *p = &old_dns[i];
1738                 uint32_t rmd_flags;
1739
1740                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1741                         continue;
1742                 }
1743
1744                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1745                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1746
1747                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1748                                            invocation_id, seq_num, seq_num, now, 0, true);
1749                 if (ret != LDB_SUCCESS) {
1750                         talloc_free(tmp_ctx);
1751                         return ret;
1752                 }
1753
1754                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1755                 if (ret != LDB_SUCCESS) {
1756                         talloc_free(tmp_ctx);
1757                         return ret;
1758                 }
1759         }
1760
1761         el->values = talloc_steal(msg->elements, old_el->values);
1762         el->num_values = old_el->num_values;
1763
1764         talloc_free(tmp_ctx);
1765
1766         /* we now tell the backend to replace all existing values
1767            with the one we have constructed */
1768         el->flags = LDB_FLAG_MOD_REPLACE;
1769
1770         return LDB_SUCCESS;
1771 }
1772
1773 /*
1774   handle replacing a linked attribute
1775  */
1776 static int replmd_modify_la_replace(struct ldb_module *module,
1777                                     const struct dsdb_schema *schema,
1778                                     struct ldb_message *msg,
1779                                     struct ldb_message_element *el,
1780                                     struct ldb_message_element *old_el,
1781                                     const struct dsdb_attribute *schema_attr,
1782                                     uint64_t seq_num,
1783                                     time_t t,
1784                                     struct GUID *msg_guid)
1785 {
1786         unsigned int i;
1787         struct parsed_dn *dns, *old_dns;
1788         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1789         int ret;
1790         const struct GUID *invocation_id;
1791         struct ldb_context *ldb = ldb_module_get_ctx(module);
1792         struct ldb_val *new_values = NULL;
1793         unsigned int num_new_values = 0;
1794         unsigned int old_num_values = old_el?old_el->num_values:0;
1795         NTTIME now;
1796
1797         unix_to_nt_time(&now, t);
1798
1799         /* check if there is nothing to replace */
1800         if ((!old_el || old_el->num_values == 0) &&
1801             el->num_values == 0) {
1802                 return LDB_SUCCESS;
1803         }
1804
1805         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1806         if (ret != LDB_SUCCESS) {
1807                 talloc_free(tmp_ctx);
1808                 return ret;
1809         }
1810
1811         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1812         if (ret != LDB_SUCCESS) {
1813                 talloc_free(tmp_ctx);
1814                 return ret;
1815         }
1816
1817         invocation_id = samdb_ntds_invocation_id(ldb);
1818         if (!invocation_id) {
1819                 return LDB_ERR_OPERATIONS_ERROR;
1820         }
1821
1822         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1823         if (ret != LDB_SUCCESS) {
1824                 talloc_free(tmp_ctx);
1825                 return ret;
1826         }
1827
1828         /* mark all the old ones as deleted */
1829         for (i=0; i<old_num_values; i++) {
1830                 struct parsed_dn *old_p = &old_dns[i];
1831                 struct parsed_dn *p;
1832                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1833
1834                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1835
1836                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1837                 if (ret != LDB_SUCCESS) {
1838                         talloc_free(tmp_ctx);
1839                         return ret;
1840                 }
1841
1842                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1843                 if (p) {
1844                         /* we don't delete it if we are re-adding it */
1845                         continue;
1846                 }
1847
1848                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1849                                            invocation_id, seq_num, seq_num, now, 0, true);
1850                 if (ret != LDB_SUCCESS) {
1851                         talloc_free(tmp_ctx);
1852                         return ret;
1853                 }
1854         }
1855
1856         /* for each new value, either update its meta-data, or add it
1857          * to old_el
1858         */
1859         for (i=0; i<el->num_values; i++) {
1860                 struct parsed_dn *p = &dns[i], *old_p;
1861
1862                 if (old_dns &&
1863                     (old_p = parsed_dn_find(old_dns,
1864                                             old_num_values, p->guid, NULL)) != NULL) {
1865                         /* update in place */
1866                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1867                                                    old_p->dsdb_dn, invocation_id,
1868                                                    seq_num, seq_num, now, 0, false);
1869                         if (ret != LDB_SUCCESS) {
1870                                 talloc_free(tmp_ctx);
1871                                 return ret;
1872                         }
1873                 } else {
1874                         /* add a new one */
1875                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1876                                                     num_new_values+1);
1877                         if (new_values == NULL) {
1878                                 ldb_module_oom(module);
1879                                 talloc_free(tmp_ctx);
1880                                 return LDB_ERR_OPERATIONS_ERROR;
1881                         }
1882                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1883                                                   invocation_id, seq_num, seq_num, now, 0, false);
1884                         if (ret != LDB_SUCCESS) {
1885                                 talloc_free(tmp_ctx);
1886                                 return ret;
1887                         }
1888                         num_new_values++;
1889                 }
1890
1891                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1892                 if (ret != LDB_SUCCESS) {
1893                         talloc_free(tmp_ctx);
1894                         return ret;
1895                 }
1896         }
1897
1898         /* add the new values to the end of old_el */
1899         if (num_new_values != 0) {
1900                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1901                                             struct ldb_val, old_num_values+num_new_values);
1902                 if (el->values == NULL) {
1903                         ldb_module_oom(module);
1904                         return LDB_ERR_OPERATIONS_ERROR;
1905                 }
1906                 memcpy(&el->values[old_num_values], &new_values[0],
1907                        sizeof(struct ldb_val)*num_new_values);
1908                 el->num_values = old_num_values + num_new_values;
1909                 talloc_steal(msg->elements, new_values);
1910         } else {
1911                 el->values = old_el->values;
1912                 el->num_values = old_el->num_values;
1913                 talloc_steal(msg->elements, el->values);
1914         }
1915
1916         talloc_free(tmp_ctx);
1917
1918         /* we now tell the backend to replace all existing values
1919            with the one we have constructed */
1920         el->flags = LDB_FLAG_MOD_REPLACE;
1921
1922         return LDB_SUCCESS;
1923 }
1924
1925
1926 /*
1927   handle linked attributes in modify requests
1928  */
1929 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1930                                                struct ldb_message *msg,
1931                                                uint64_t seq_num, time_t t)
1932 {
1933         struct ldb_result *res;
1934         unsigned int i;
1935         int ret;
1936         struct ldb_context *ldb = ldb_module_get_ctx(module);
1937         struct ldb_message *old_msg;
1938
1939         const struct dsdb_schema *schema;
1940         struct GUID old_guid;
1941
1942         if (seq_num == 0) {
1943                 /* there the replmd_update_rpmd code has already
1944                  * checked and saw that there are no linked
1945                  * attributes */
1946                 return LDB_SUCCESS;
1947         }
1948
1949 #if !W2K3_LINKED_ATTRIBUTES
1950         return LDB_SUCCESS;
1951 #endif
1952
1953         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1954                 /* don't do anything special for linked attributes */
1955                 return LDB_SUCCESS;
1956         }
1957
1958         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1959                                     DSDB_SEARCH_SHOW_DELETED |
1960                                     DSDB_SEARCH_REVEAL_INTERNALS |
1961                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1962         if (ret != LDB_SUCCESS) {
1963                 return ret;
1964         }
1965         schema = dsdb_get_schema(ldb, res);
1966         if (!schema) {
1967                 return LDB_ERR_OPERATIONS_ERROR;
1968         }
1969
1970         old_msg = res->msgs[0];
1971
1972         old_guid = samdb_result_guid(old_msg, "objectGUID");
1973
1974         for (i=0; i<msg->num_elements; i++) {
1975                 struct ldb_message_element *el = &msg->elements[i];
1976                 struct ldb_message_element *old_el, *new_el;
1977                 const struct dsdb_attribute *schema_attr
1978                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1979                 if (!schema_attr) {
1980                         ldb_asprintf_errstring(ldb,
1981                                                "attribute %s is not a valid attribute in schema", el->name);
1982                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
1983                 }
1984                 if (schema_attr->linkID == 0) {
1985                         continue;
1986                 }
1987                 if ((schema_attr->linkID & 1) == 1) {
1988                         /* Odd is for the target.  Illegal to modify */
1989                         ldb_asprintf_errstring(ldb,
1990                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
1991                         return LDB_ERR_UNWILLING_TO_PERFORM;
1992                 }
1993                 old_el = ldb_msg_find_element(old_msg, el->name);
1994                 switch (el->flags & LDB_FLAG_MOD_MASK) {
1995                 case LDB_FLAG_MOD_REPLACE:
1996                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1997                         break;
1998                 case LDB_FLAG_MOD_DELETE:
1999                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2000                         break;
2001                 case LDB_FLAG_MOD_ADD:
2002                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2003                         break;
2004                 default:
2005                         ldb_asprintf_errstring(ldb,
2006                                                "invalid flags 0x%x for %s linked attribute",
2007                                                el->flags, el->name);
2008                         return LDB_ERR_UNWILLING_TO_PERFORM;
2009                 }
2010                 if (ret != LDB_SUCCESS) {
2011                         return ret;
2012                 }
2013                 if (old_el) {
2014                         ldb_msg_remove_attr(old_msg, el->name);
2015                 }
2016                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2017                 new_el->num_values = el->num_values;
2018                 new_el->values = talloc_steal(msg->elements, el->values);
2019
2020                 /* TODO: this relises a bit too heavily on the exact
2021                    behaviour of ldb_msg_find_element and
2022                    ldb_msg_remove_element */
2023                 old_el = ldb_msg_find_element(msg, el->name);
2024                 if (old_el != el) {
2025                         ldb_msg_remove_element(msg, old_el);
2026                         i--;
2027                 }
2028         }
2029
2030         talloc_free(res);
2031         return ret;
2032 }
2033
2034
2035
2036 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2037 {
2038         struct ldb_context *ldb;
2039         struct replmd_replicated_request *ac;
2040         struct ldb_request *down_req;
2041         struct ldb_message *msg;
2042         time_t t = time(NULL);
2043         int ret;
2044         bool is_urgent = false;
2045
2046         /* do not manipulate our control entries */
2047         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2048                 return ldb_next_request(module, req);
2049         }
2050
2051         ldb = ldb_module_get_ctx(module);
2052
2053         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2054
2055         ac = replmd_ctx_init(module, req);
2056         if (!ac) {
2057                 return LDB_ERR_OPERATIONS_ERROR;
2058         }
2059
2060         /* we have to copy the message as the caller might have it as a const */
2061         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2062         if (msg == NULL) {
2063                 ldb_oom(ldb);
2064                 talloc_free(ac);
2065                 return LDB_ERR_OPERATIONS_ERROR;
2066         }
2067
2068         ldb_msg_remove_attr(msg, "whenChanged");
2069         ldb_msg_remove_attr(msg, "uSNChanged");
2070
2071         ret = replmd_update_rpmd(module, ac->schema, msg, &ac->seq_num, t, &is_urgent);
2072         if (ret != LDB_SUCCESS) {
2073                 talloc_free(ac);
2074                 return ret;
2075         }
2076
2077         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
2078         if (ret != LDB_SUCCESS) {
2079                 talloc_free(ac);
2080                 return ret;
2081         }
2082
2083         /* TODO:
2084          * - replace the old object with the newly constructed one
2085          */
2086
2087         ac->is_urgent = is_urgent;
2088
2089         ret = ldb_build_mod_req(&down_req, ldb, ac,
2090                                 msg,
2091                                 req->controls,
2092                                 ac, replmd_op_callback,
2093                                 req);
2094         if (ret != LDB_SUCCESS) {
2095                 talloc_free(ac);
2096                 return ret;
2097         }
2098         talloc_steal(down_req, msg);
2099
2100         /* we only change whenChanged and uSNChanged if the seq_num
2101            has changed */
2102         if (ac->seq_num != 0) {
2103                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2104                         talloc_free(ac);
2105                         return ret;
2106                 }
2107
2108                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2109                         talloc_free(ac);
2110                         return ret;
2111                 }
2112         }
2113
2114         /* go on with the call chain */
2115         return ldb_next_request(module, down_req);
2116 }
2117
2118 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2119
2120 /*
2121   handle a rename request
2122
2123   On a rename we need to do an extra ldb_modify which sets the
2124   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2125  */
2126 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2127 {
2128         struct ldb_context *ldb;
2129         struct replmd_replicated_request *ac;
2130         int ret;
2131         struct ldb_request *down_req;
2132
2133         /* do not manipulate our control entries */
2134         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2135                 return ldb_next_request(module, req);
2136         }
2137
2138         ldb = ldb_module_get_ctx(module);
2139
2140         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2141
2142         ac = replmd_ctx_init(module, req);
2143         if (!ac) {
2144                 return LDB_ERR_OPERATIONS_ERROR;
2145         }
2146         ret = ldb_build_rename_req(&down_req, ldb, ac,
2147                                    ac->req->op.rename.olddn,
2148                                    ac->req->op.rename.newdn,
2149                                    ac->req->controls,
2150                                    ac, replmd_rename_callback,
2151                                    ac->req);
2152
2153         if (ret != LDB_SUCCESS) {
2154                 talloc_free(ac);
2155                 return ret;
2156         }
2157
2158         /* go on with the call chain */
2159         return ldb_next_request(module, down_req);
2160 }
2161
2162 /* After the rename is compleated, update the whenchanged etc */
2163 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2164 {
2165         struct ldb_context *ldb;
2166         struct replmd_replicated_request *ac;
2167         struct ldb_request *down_req;
2168         struct ldb_message *msg;
2169         time_t t = time(NULL);
2170         int ret;
2171
2172         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2173         ldb = ldb_module_get_ctx(ac->module);
2174
2175         if (ares->error != LDB_SUCCESS) {
2176                 return ldb_module_done(ac->req, ares->controls,
2177                                         ares->response, ares->error);
2178         }
2179
2180         if (ares->type != LDB_REPLY_DONE) {
2181                 ldb_set_errstring(ldb,
2182                                   "invalid ldb_reply_type in callback");
2183                 talloc_free(ares);
2184                 return ldb_module_done(ac->req, NULL, NULL,
2185                                         LDB_ERR_OPERATIONS_ERROR);
2186         }
2187
2188         /* Get a sequence number from the backend */
2189         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2190         if (ret != LDB_SUCCESS) {
2191                 return ret;
2192         }
2193
2194         /* TODO:
2195          * - replace the old object with the newly constructed one
2196          */
2197
2198         msg = ldb_msg_new(ac);
2199         if (msg == NULL) {
2200                 ldb_oom(ldb);
2201                 return LDB_ERR_OPERATIONS_ERROR;
2202         }
2203
2204         msg->dn = ac->req->op.rename.newdn;
2205
2206         ret = ldb_build_mod_req(&down_req, ldb, ac,
2207                                 msg,
2208                                 req->controls,
2209                                 ac, replmd_op_callback,
2210                                 req);
2211
2212         if (ret != LDB_SUCCESS) {
2213                 talloc_free(ac);
2214                 return ret;
2215         }
2216         talloc_steal(down_req, msg);
2217
2218         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2219                 talloc_free(ac);
2220                 return ret;
2221         }
2222
2223         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2224                 talloc_free(ac);
2225                 return ret;
2226         }
2227
2228         /* go on with the call chain - do the modify after the rename */
2229         return ldb_next_request(ac->module, down_req);
2230 }
2231
2232 /*
2233    remove links from objects that point at this object when an object
2234    is deleted
2235  */
2236 static int replmd_delete_remove_link(struct ldb_module *module,
2237                                      const struct dsdb_schema *schema,
2238                                      struct ldb_dn *dn,
2239                                      struct ldb_message_element *el,
2240                                      const struct dsdb_attribute *sa)
2241 {
2242         unsigned int i;
2243         TALLOC_CTX *tmp_ctx = talloc_new(module);
2244         struct ldb_context *ldb = ldb_module_get_ctx(module);
2245
2246         for (i=0; i<el->num_values; i++) {
2247                 struct dsdb_dn *dsdb_dn;
2248                 NTSTATUS status;
2249                 int ret;
2250                 struct GUID guid2;
2251                 struct ldb_message *msg;
2252                 const struct dsdb_attribute *target_attr;
2253                 struct ldb_message_element *el2;
2254                 struct ldb_val dn_val;
2255
2256                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2257                         continue;
2258                 }
2259
2260                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2261                 if (!dsdb_dn) {
2262                         talloc_free(tmp_ctx);
2263                         return LDB_ERR_OPERATIONS_ERROR;
2264                 }
2265
2266                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2267                 if (!NT_STATUS_IS_OK(status)) {
2268                         talloc_free(tmp_ctx);
2269                         return LDB_ERR_OPERATIONS_ERROR;
2270                 }
2271
2272                 /* remove the link */
2273                 msg = ldb_msg_new(tmp_ctx);
2274                 if (!msg) {
2275                         ldb_module_oom(module);
2276                         talloc_free(tmp_ctx);
2277                         return LDB_ERR_OPERATIONS_ERROR;
2278                 }
2279
2280
2281                 msg->dn = dsdb_dn->dn;
2282
2283                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2284                 if (target_attr == NULL) {
2285                         continue;
2286                 }
2287
2288                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2289                 if (ret != LDB_SUCCESS) {
2290                         ldb_module_oom(module);
2291                         talloc_free(tmp_ctx);
2292                         return LDB_ERR_OPERATIONS_ERROR;
2293                 }
2294                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2295                 el2->values = &dn_val;
2296                 el2->num_values = 1;
2297
2298                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2299                 if (ret != LDB_SUCCESS) {
2300                         talloc_free(tmp_ctx);
2301                         return ret;
2302                 }
2303         }
2304         talloc_free(tmp_ctx);
2305         return LDB_SUCCESS;
2306 }
2307
2308
2309 /*
2310   handle update of replication meta data for deletion of objects
2311
2312   This also handles the mapping of delete to a rename operation
2313   to allow deletes to be replicated.
2314  */
2315 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2316 {
2317         int ret = LDB_ERR_OTHER;
2318         bool retb;
2319         struct ldb_dn *old_dn, *new_dn;
2320         const char *rdn_name;
2321         const struct ldb_val *rdn_value, *new_rdn_value;
2322         struct GUID guid;
2323         struct ldb_context *ldb = ldb_module_get_ctx(module);
2324         const struct dsdb_schema *schema;
2325         struct ldb_message *msg, *old_msg;
2326         struct ldb_message_element *el;
2327         TALLOC_CTX *tmp_ctx;
2328         struct ldb_result *res, *parent_res;
2329         const char *preserved_attrs[] = {
2330                 /* yes, this really is a hard coded list. See MS-ADTS
2331                    section 3.1.1.5.5.1.1 */
2332                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2333                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2334                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2335                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2336                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2337                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2338                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2339                 "whenChanged", NULL};
2340         unsigned int i, el_count = 0;
2341
2342         if (ldb_dn_is_special(req->op.del.dn)) {
2343                 return ldb_next_request(module, req);
2344         }
2345
2346         tmp_ctx = talloc_new(ldb);
2347         if (!tmp_ctx) {
2348                 ldb_oom(ldb);
2349                 return LDB_ERR_OPERATIONS_ERROR;
2350         }
2351
2352         schema = dsdb_get_schema(ldb, tmp_ctx);
2353         if (!schema) {
2354                 return LDB_ERR_OPERATIONS_ERROR;
2355         }
2356
2357         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2358
2359         /* we need the complete msg off disk, so we can work out which
2360            attributes need to be removed */
2361         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2362                                     DSDB_SEARCH_SHOW_DELETED |
2363                                     DSDB_SEARCH_REVEAL_INTERNALS |
2364                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2365         if (ret != LDB_SUCCESS) {
2366                 talloc_free(tmp_ctx);
2367                 return ret;
2368         }
2369         old_msg = res->msgs[0];
2370
2371         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2372                 struct auth_session_info *session_info =
2373                         (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2374                 if (security_session_user_level(session_info) != SECURITY_SYSTEM) {
2375                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2376                                                ldb_dn_get_linearized(old_msg->dn));
2377                         return LDB_ERR_UNWILLING_TO_PERFORM;
2378                 }
2379
2380                 /* it is already deleted - really remove it this time */
2381                 talloc_free(tmp_ctx);
2382                 return ldb_next_request(module, req);
2383         }
2384
2385         /* work out where we will be renaming this object to */
2386         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2387         if (ret != LDB_SUCCESS) {
2388                 /* this is probably an attempted delete on a partition
2389                  * that doesn't allow delete operations, such as the
2390                  * schema partition */
2391                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2392                                        ldb_dn_get_linearized(old_dn));
2393                 talloc_free(tmp_ctx);
2394                 return LDB_ERR_UNWILLING_TO_PERFORM;
2395         }
2396
2397         rdn_name = ldb_dn_get_rdn_name(old_dn);
2398         rdn_value = ldb_dn_get_rdn_val(old_dn);
2399
2400         /* get the objects GUID from the search we just did */
2401         guid = samdb_result_guid(old_msg, "objectGUID");
2402
2403         /* Add a formatted child */
2404         retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2405                                     rdn_name,
2406                                     rdn_value->data,
2407                                     GUID_string(tmp_ctx, &guid));
2408         if (!retb) {
2409                 DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2410                                 ldb_dn_get_linearized(new_dn)));
2411                 talloc_free(tmp_ctx);
2412                 return LDB_ERR_OPERATIONS_ERROR;
2413         }
2414
2415         /*
2416           now we need to modify the object in the following ways:
2417
2418           - add isDeleted=TRUE
2419           - update rDN and name, with new rDN
2420           - remove linked attributes
2421           - remove objectCategory and sAMAccountType
2422           - remove attribs not on the preserved list
2423              - preserved if in above list, or is rDN
2424           - remove all linked attribs from this object
2425           - remove all links from other objects to this object
2426           - add lastKnownParent
2427           - update replPropertyMetaData?
2428
2429           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2430          */
2431
2432         msg = ldb_msg_new(tmp_ctx);
2433         if (msg == NULL) {
2434                 ldb_module_oom(module);
2435                 talloc_free(tmp_ctx);
2436                 return LDB_ERR_OPERATIONS_ERROR;
2437         }
2438
2439         msg->dn = old_dn;
2440
2441         ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2442         if (ret != LDB_SUCCESS) {
2443                 DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2444                 ldb_module_oom(module);
2445                 talloc_free(tmp_ctx);
2446                 return ret;
2447         }
2448         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2449
2450         /* we also mark it as recycled, meaning this object can't be
2451            recovered (we are stripping its attributes) */
2452         if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2453                 ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2454                 if (ret != LDB_SUCCESS) {
2455                         DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2456                         ldb_module_oom(module);
2457                         talloc_free(tmp_ctx);
2458                         return ret;
2459                 }
2460                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2461         }
2462
2463         /* we need the storage form of the parent GUID */
2464         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2465                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2466                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2467                                     DSDB_SEARCH_REVEAL_INTERNALS);
2468         if (ret != LDB_SUCCESS) {
2469                 talloc_free(tmp_ctx);
2470                 return ret;
2471         }
2472
2473         ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2474                                        ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2475         if (ret != LDB_SUCCESS) {
2476                 DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2477                 ldb_module_oom(module);
2478                 talloc_free(tmp_ctx);
2479                 return ret;
2480         }
2481         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2482
2483         /* work out which of the old attributes we will be removing */
2484         for (i=0; i<old_msg->num_elements; i++) {
2485                 const struct dsdb_attribute *sa;
2486                 el = &old_msg->elements[i];
2487                 sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2488                 if (!sa) {
2489                         talloc_free(tmp_ctx);
2490                         return LDB_ERR_OPERATIONS_ERROR;
2491                 }
2492                 if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2493                         /* don't remove the rDN */
2494                         continue;
2495                 }
2496
2497                 if (sa->linkID && sa->linkID & 1) {
2498                         ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2499                         if (ret != LDB_SUCCESS) {
2500                                 talloc_free(tmp_ctx);
2501                                 return LDB_ERR_OPERATIONS_ERROR;
2502                         }
2503                         continue;
2504                 }
2505
2506                 if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2507                         continue;
2508                 }
2509
2510                 ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2511                 if (ret != LDB_SUCCESS) {
2512                         talloc_free(tmp_ctx);
2513                         ldb_module_oom(module);
2514                         return ret;
2515                 }
2516         }
2517
2518         /* work out what the new rdn value is, for updating the
2519            rDN and name fields */
2520         new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2521         ret = ldb_msg_add_value(msg, rdn_name, new_rdn_value, &el);
2522         if (ret != LDB_SUCCESS) {
2523                 talloc_free(tmp_ctx);
2524                 return ret;
2525         }
2526         el->flags = LDB_FLAG_MOD_REPLACE;
2527
2528         el = ldb_msg_find_element(old_msg, "name");
2529         if (el) {
2530                 ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2531                 if (ret != LDB_SUCCESS) {
2532                         talloc_free(tmp_ctx);
2533                         return ret;
2534                 }
2535                 el->flags = LDB_FLAG_MOD_REPLACE;
2536         }
2537
2538         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2539         if (ret != LDB_SUCCESS) {
2540                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2541                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2542                 talloc_free(tmp_ctx);
2543                 return ret;
2544         }
2545
2546         /* now rename onto the new DN */
2547         ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2548         if (ret != LDB_SUCCESS){
2549                 DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2550                          ldb_dn_get_linearized(old_dn),
2551                          ldb_dn_get_linearized(new_dn),
2552                          ldb_errstring(ldb)));
2553                 talloc_free(tmp_ctx);
2554                 return ret;
2555         }
2556
2557         talloc_free(tmp_ctx);
2558
2559         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2560 }
2561
2562
2563
2564 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2565 {
2566         return ret;
2567 }
2568
2569 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2570 {
2571         int ret = LDB_ERR_OTHER;
2572         /* TODO: do some error mapping */
2573         return ret;
2574 }
2575
2576 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2577 {
2578         struct ldb_context *ldb;
2579         struct ldb_request *change_req;
2580         enum ndr_err_code ndr_err;
2581         struct ldb_message *msg;
2582         struct replPropertyMetaDataBlob *md;
2583         struct ldb_val md_value;
2584         unsigned int i;
2585         int ret;
2586
2587         /*
2588          * TODO: check if the parent object exist
2589          */
2590
2591         /*
2592          * TODO: handle the conflict case where an object with the
2593          *       same name exist
2594          */
2595
2596         ldb = ldb_module_get_ctx(ar->module);
2597         msg = ar->objs->objects[ar->index_current].msg;
2598         md = ar->objs->objects[ar->index_current].meta_data;
2599
2600         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2601         if (ret != LDB_SUCCESS) {
2602                 return replmd_replicated_request_error(ar, ret);
2603         }
2604
2605         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2606         if (ret != LDB_SUCCESS) {
2607                 return replmd_replicated_request_error(ar, ret);
2608         }
2609
2610         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2611         if (ret != LDB_SUCCESS) {
2612                 return replmd_replicated_request_error(ar, ret);
2613         }
2614
2615         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2616         if (ret != LDB_SUCCESS) {
2617                 return replmd_replicated_request_error(ar, ret);
2618         }
2619
2620         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2621         if (ret != LDB_SUCCESS) {
2622                 return replmd_replicated_request_error(ar, ret);
2623         }
2624
2625         /* remove any message elements that have zero values */
2626         for (i=0; i<msg->num_elements; i++) {
2627                 struct ldb_message_element *el = &msg->elements[i];
2628
2629                 if (el->num_values == 0) {
2630                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2631                                  el->name));
2632                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2633                         msg->num_elements--;
2634                         i--;
2635                         continue;
2636                 }
2637         }
2638
2639         /*
2640          * the meta data array is already sorted by the caller
2641          */
2642         for (i=0; i < md->ctr.ctr1.count; i++) {
2643                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2644         }
2645         ndr_err = ndr_push_struct_blob(&md_value, msg,
2646                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2647                                        md,
2648                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2649         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2650                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2651                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2652         }
2653         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2654         if (ret != LDB_SUCCESS) {
2655                 return replmd_replicated_request_error(ar, ret);
2656         }
2657
2658         replmd_ldb_message_sort(msg, ar->schema);
2659
2660         if (DEBUGLVL(4)) {
2661                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2662                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2663                 talloc_free(s);
2664         }
2665
2666         ret = ldb_build_add_req(&change_req,
2667                                 ldb,
2668                                 ar,
2669                                 msg,
2670                                 ar->controls,
2671                                 ar,
2672                                 replmd_op_callback,
2673                                 ar->req);
2674         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2675
2676         return ldb_next_request(ar->module, change_req);
2677 }
2678
2679 /*
2680    return true if an update is newer than an existing entry
2681    see section 5.11 of MS-ADTS
2682 */
2683 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2684                                    const struct GUID *update_invocation_id,
2685                                    uint32_t current_version,
2686                                    uint32_t update_version,
2687                                    NTTIME current_change_time,
2688                                    NTTIME update_change_time)
2689 {
2690         if (update_version != current_version) {
2691                 return update_version > current_version;
2692         }
2693         if (update_change_time > current_change_time) {
2694                 return true;
2695         }
2696         if (update_change_time == current_change_time) {
2697                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2698         }
2699         return false;
2700 }
2701
2702 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2703                                                   struct replPropertyMetaData1 *new_m)
2704 {
2705         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2706                                       &new_m->originating_invocation_id,
2707                                       cur_m->version,
2708                                       new_m->version,
2709                                       cur_m->originating_change_time,
2710                                       new_m->originating_change_time);
2711 }
2712
2713 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2714 {
2715         struct ldb_context *ldb;
2716         struct ldb_request *change_req;
2717         enum ndr_err_code ndr_err;
2718         struct ldb_message *msg;
2719         struct replPropertyMetaDataBlob *rmd;
2720         struct replPropertyMetaDataBlob omd;
2721         const struct ldb_val *omd_value;
2722         struct replPropertyMetaDataBlob nmd;
2723         struct ldb_val nmd_value;
2724         unsigned int i;
2725         uint32_t j,ni=0;
2726         unsigned int removed_attrs = 0;
2727         int ret;
2728
2729         ldb = ldb_module_get_ctx(ar->module);
2730         msg = ar->objs->objects[ar->index_current].msg;
2731         rmd = ar->objs->objects[ar->index_current].meta_data;
2732         ZERO_STRUCT(omd);
2733         omd.version = 1;
2734
2735         /*
2736          * TODO: check repl data is correct after a rename
2737          */
2738         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2739                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2740                           ldb_dn_get_linearized(ar->search_msg->dn),
2741                           ldb_dn_get_linearized(msg->dn));
2742                 if (dsdb_module_rename(ar->module,
2743                                        ar->search_msg->dn, msg->dn,
2744                                        DSDB_FLAG_OWN_MODULE) != LDB_SUCCESS) {
2745                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2746                                   ldb_dn_get_linearized(ar->search_msg->dn),
2747                                   ldb_dn_get_linearized(msg->dn),
2748                                   ldb_errstring(ldb));
2749                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2750                 }
2751         }
2752
2753         /* find existing meta data */
2754         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2755         if (omd_value) {
2756                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
2757                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
2758                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2759                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2760                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2761                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2762                 }
2763
2764                 if (omd.version != 1) {
2765                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2766                 }
2767         }
2768
2769         ZERO_STRUCT(nmd);
2770         nmd.version = 1;
2771         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2772         nmd.ctr.ctr1.array = talloc_array(ar,
2773                                           struct replPropertyMetaData1,
2774                                           nmd.ctr.ctr1.count);
2775         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2776
2777         /* first copy the old meta data */
2778         for (i=0; i < omd.ctr.ctr1.count; i++) {
2779                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2780                 ni++;
2781         }
2782
2783         /* now merge in the new meta data */
2784         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2785                 bool found = false;
2786
2787                 for (j=0; j < ni; j++) {
2788                         bool cmp;
2789
2790                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2791                                 continue;
2792                         }
2793
2794                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2795                                                                     &rmd->ctr.ctr1.array[i]);
2796                         if (cmp) {
2797                                 /* replace the entry */
2798                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2799                                 found = true;
2800                                 break;
2801                         }
2802
2803                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
2804                                 DEBUG(1,("Discarding older DRS attribute update to %s on %s from %s\n",
2805                                          msg->elements[i-removed_attrs].name,
2806                                          ldb_dn_get_linearized(msg->dn),
2807                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2808                         }
2809
2810                         /* we don't want to apply this change so remove the attribute */
2811                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2812                         removed_attrs++;
2813
2814                         found = true;
2815                         break;
2816                 }
2817
2818                 if (found) continue;
2819
2820                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2821                 ni++;
2822         }
2823
2824         /*
2825          * finally correct the size of the meta_data array
2826          */
2827         nmd.ctr.ctr1.count = ni;
2828
2829         /*
2830          * the rdn attribute (the alias for the name attribute),
2831          * 'cn' for most objects is the last entry in the meta data array
2832          * we have stored
2833          *
2834          * sort the new meta data array
2835          */
2836         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2837         if (ret != LDB_SUCCESS) {
2838                 return ret;
2839         }
2840
2841         /*
2842          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2843          */
2844         if (msg->num_elements == 0) {
2845                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2846                           ar->index_current);
2847
2848                 ar->index_current++;
2849                 return replmd_replicated_apply_next(ar);
2850         }
2851
2852         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2853                   ar->index_current, msg->num_elements);
2854
2855         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2856         if (ret != LDB_SUCCESS) {
2857                 return replmd_replicated_request_error(ar, ret);
2858         }
2859
2860         for (i=0; i<ni; i++) {
2861                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2862         }
2863
2864         /* create the meta data value */
2865         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
2866                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2867                                        &nmd,
2868                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2869         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2870                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2871                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2872         }
2873
2874         /*
2875          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2876          * and replPopertyMetaData attributes
2877          */
2878         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2879         if (ret != LDB_SUCCESS) {
2880                 return replmd_replicated_request_error(ar, ret);
2881         }
2882         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2883         if (ret != LDB_SUCCESS) {
2884                 return replmd_replicated_request_error(ar, ret);
2885         }
2886         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2887         if (ret != LDB_SUCCESS) {
2888                 return replmd_replicated_request_error(ar, ret);
2889         }
2890
2891         replmd_ldb_message_sort(msg, ar->schema);
2892
2893         /* we want to replace the old values */
2894         for (i=0; i < msg->num_elements; i++) {
2895                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
2896         }
2897
2898         if (DEBUGLVL(4)) {
2899                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
2900                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
2901                 talloc_free(s);
2902         }
2903
2904         ret = ldb_build_mod_req(&change_req,
2905                                 ldb,
2906                                 ar,
2907                                 msg,
2908                                 ar->controls,
2909                                 ar,
2910                                 replmd_op_callback,
2911                                 ar->req);
2912         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2913
2914         return ldb_next_request(ar->module, change_req);
2915 }
2916
2917 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
2918                                                    struct ldb_reply *ares)
2919 {
2920         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2921                                                struct replmd_replicated_request);
2922         int ret;
2923
2924         if (!ares) {
2925                 return ldb_module_done(ar->req, NULL, NULL,
2926                                         LDB_ERR_OPERATIONS_ERROR);
2927         }
2928         if (ares->error != LDB_SUCCESS &&
2929             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
2930                 return ldb_module_done(ar->req, ares->controls,
2931                                         ares->response, ares->error);
2932         }
2933
2934         switch (ares->type) {
2935         case LDB_REPLY_ENTRY:
2936                 ar->search_msg = talloc_steal(ar, ares->message);
2937                 break;
2938
2939         case LDB_REPLY_REFERRAL:
2940                 /* we ignore referrals */
2941                 break;
2942
2943         case LDB_REPLY_DONE:
2944                 if (ar->search_msg != NULL) {
2945                         ret = replmd_replicated_apply_merge(ar);
2946                 } else {
2947                         ret = replmd_replicated_apply_add(ar);
2948                 }
2949                 if (ret != LDB_SUCCESS) {
2950                         return ldb_module_done(ar->req, NULL, NULL, ret);
2951                 }
2952         }
2953
2954         talloc_free(ares);
2955         return LDB_SUCCESS;
2956 }
2957
2958 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
2959
2960 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
2961 {
2962         struct ldb_context *ldb;
2963         int ret;
2964         char *tmp_str;
2965         char *filter;
2966         struct ldb_request *search_req;
2967         struct ldb_search_options_control *options;
2968
2969         if (ar->index_current >= ar->objs->num_objects) {
2970                 /* done with it, go to next stage */
2971                 return replmd_replicated_uptodate_vector(ar);
2972         }
2973
2974         ldb = ldb_module_get_ctx(ar->module);
2975         ar->search_msg = NULL;
2976
2977         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
2978         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2979
2980         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
2981         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2982         talloc_free(tmp_str);
2983
2984         ret = ldb_build_search_req(&search_req,
2985                                    ldb,
2986                                    ar,
2987                                    NULL,
2988                                    LDB_SCOPE_SUBTREE,
2989                                    filter,
2990                                    NULL,
2991                                    NULL,
2992                                    ar,
2993                                    replmd_replicated_apply_search_callback,
2994                                    ar->req);
2995
2996         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
2997         if (ret != LDB_SUCCESS) {
2998                 return ret;
2999         }
3000
3001         /* we need to cope with cross-partition links, so search for
3002            the GUID over all partitions */
3003         options = talloc(search_req, struct ldb_search_options_control);
3004         if (options == NULL) {
3005                 DEBUG(0, (__location__ ": out of memory\n"));
3006                 return LDB_ERR_OPERATIONS_ERROR;
3007         }
3008         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
3009
3010         ret = ldb_request_add_control(search_req,
3011                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
3012                                       true, options);
3013         if (ret != LDB_SUCCESS) {
3014                 return ret;
3015         }
3016
3017         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3018
3019         return ldb_next_request(ar->module, search_req);
3020 }
3021
3022 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
3023                                                       struct ldb_reply *ares)
3024 {
3025         struct ldb_context *ldb;
3026         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3027                                                struct replmd_replicated_request);
3028         ldb = ldb_module_get_ctx(ar->module);
3029
3030         if (!ares) {
3031                 return ldb_module_done(ar->req, NULL, NULL,
3032                                         LDB_ERR_OPERATIONS_ERROR);
3033         }
3034         if (ares->error != LDB_SUCCESS) {
3035                 return ldb_module_done(ar->req, ares->controls,
3036                                         ares->response, ares->error);
3037         }
3038
3039         if (ares->type != LDB_REPLY_DONE) {
3040                 ldb_set_errstring(ldb, "Invalid reply type\n!");
3041                 return ldb_module_done(ar->req, NULL, NULL,
3042                                         LDB_ERR_OPERATIONS_ERROR);
3043         }
3044
3045         talloc_free(ares);
3046
3047         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3048 }
3049
3050 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3051 {
3052         struct ldb_context *ldb;
3053         struct ldb_request *change_req;
3054         enum ndr_err_code ndr_err;
3055         struct ldb_message *msg;
3056         struct replUpToDateVectorBlob ouv;
3057         const struct ldb_val *ouv_value;
3058         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3059         struct replUpToDateVectorBlob nuv;
3060         struct ldb_val nuv_value;
3061         struct ldb_message_element *nuv_el = NULL;
3062         const struct GUID *our_invocation_id;
3063         struct ldb_message_element *orf_el = NULL;
3064         struct repsFromToBlob nrf;
3065         struct ldb_val *nrf_value = NULL;
3066         struct ldb_message_element *nrf_el = NULL;
3067         unsigned int i;
3068         uint32_t j,ni=0;
3069         bool found = false;
3070         time_t t = time(NULL);
3071         NTTIME now;
3072         int ret;
3073
3074         ldb = ldb_module_get_ctx(ar->module);
3075         ruv = ar->objs->uptodateness_vector;
3076         ZERO_STRUCT(ouv);
3077         ouv.version = 2;
3078         ZERO_STRUCT(nuv);
3079         nuv.version = 2;
3080
3081         unix_to_nt_time(&now, t);
3082
3083         /*
3084          * first create the new replUpToDateVector
3085          */
3086         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3087         if (ouv_value) {
3088                 ndr_err = ndr_pull_struct_blob(ouv_value, ar,
3089                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
3090                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3091                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3092                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3093                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3094                 }
3095
3096                 if (ouv.version != 2) {
3097                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3098                 }
3099         }
3100
3101         /*
3102          * the new uptodateness vector will at least
3103          * contain 1 entry, one for the source_dsa
3104          *
3105          * plus optional values from our old vector and the one from the source_dsa
3106          */
3107         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3108         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3109         nuv.ctr.ctr2.cursors = talloc_array(ar,
3110                                             struct drsuapi_DsReplicaCursor2,
3111                                             nuv.ctr.ctr2.count);
3112         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3113
3114         /* first copy the old vector */
3115         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3116                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3117                 ni++;
3118         }
3119
3120         /* get our invocation_id if we have one already attached to the ldb */
3121         our_invocation_id = samdb_ntds_invocation_id(ldb);
3122
3123         /* merge in the source_dsa vector is available */
3124         for (i=0; (ruv && i < ruv->count); i++) {
3125                 found = false;
3126
3127                 if (our_invocation_id &&
3128                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3129                                our_invocation_id)) {
3130                         continue;
3131                 }
3132
3133                 for (j=0; j < ni; j++) {
3134                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3135                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3136                                 continue;
3137                         }
3138
3139                         found = true;
3140
3141                         /*
3142                          * we update only the highest_usn and not the latest_sync_success time,
3143                          * because the last success stands for direct replication
3144                          */
3145                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3146                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3147                         }
3148                         break;
3149                 }
3150
3151                 if (found) continue;
3152
3153                 /* if it's not there yet, add it */
3154                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3155                 ni++;
3156         }
3157
3158         /*
3159          * merge in the current highwatermark for the source_dsa
3160          */
3161         found = false;
3162         for (j=0; j < ni; j++) {
3163                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3164                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3165                         continue;
3166                 }
3167
3168                 found = true;
3169
3170                 /*
3171                  * here we update the highest_usn and last_sync_success time
3172                  * because we're directly replicating from the source_dsa
3173                  *
3174                  * and use the tmp_highest_usn because this is what we have just applied
3175                  * to our ldb
3176                  */
3177                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3178                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3179                 break;
3180         }
3181         if (!found) {
3182                 /*
3183                  * here we update the highest_usn and last_sync_success time
3184                  * because we're directly replicating from the source_dsa
3185                  *
3186                  * and use the tmp_highest_usn because this is what we have just applied
3187                  * to our ldb
3188                  */
3189                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3190                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3191                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3192                 ni++;
3193         }
3194
3195         /*
3196          * finally correct the size of the cursors array
3197          */
3198         nuv.ctr.ctr2.count = ni;
3199
3200         /*
3201          * sort the cursors
3202          */
3203         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
3204
3205         /*
3206          * create the change ldb_message
3207          */
3208         msg = ldb_msg_new(ar);
3209         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3210         msg->dn = ar->search_msg->dn;
3211
3212         ndr_err = ndr_push_struct_blob(&nuv_value, msg,
3213                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3214                                        &nuv,
3215                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3216         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3217                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3218                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3219         }
3220         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3221         if (ret != LDB_SUCCESS) {
3222                 return replmd_replicated_request_error(ar, ret);
3223         }
3224         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3225
3226         /*
3227          * now create the new repsFrom value from the given repsFromTo1 structure
3228          */
3229         ZERO_STRUCT(nrf);
3230         nrf.version                                     = 1;
3231         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3232         /* and fix some values... */
3233         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3234         nrf.ctr.ctr1.last_success                       = now;
3235         nrf.ctr.ctr1.last_attempt                       = now;
3236         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3237         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3238
3239         /*
3240          * first see if we already have a repsFrom value for the current source dsa
3241          * if so we'll later replace this value
3242          */
3243         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3244         if (orf_el) {
3245                 for (i=0; i < orf_el->num_values; i++) {
3246                         struct repsFromToBlob *trf;
3247
3248                         trf = talloc(ar, struct repsFromToBlob);
3249                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3250
3251                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
3252                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3253                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3254                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3255                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3256                         }
3257
3258                         if (trf->version != 1) {
3259                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3260                         }
3261
3262                         /*
3263                          * we compare the source dsa objectGUID not the invocation_id
3264                          * because we want only one repsFrom value per source dsa
3265                          * and when the invocation_id of the source dsa has changed we don't need
3266                          * the old repsFrom with the old invocation_id
3267                          */
3268                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3269                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3270                                 talloc_free(trf);
3271                                 continue;
3272                         }
3273
3274                         talloc_free(trf);
3275                         nrf_value = &orf_el->values[i];
3276                         break;
3277                 }
3278
3279                 /*
3280                  * copy over all old values to the new ldb_message
3281                  */
3282                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3283                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3284                 *nrf_el = *orf_el;
3285         }
3286
3287         /*
3288          * if we haven't found an old repsFrom value for the current source dsa
3289          * we'll add a new value
3290          */
3291         if (!nrf_value) {
3292                 struct ldb_val zero_value;
3293                 ZERO_STRUCT(zero_value);
3294                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3295                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3296
3297                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3298         }
3299
3300         /* we now fill the value which is already attached to ldb_message */
3301         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3302                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3303                                        &nrf,
3304                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3305         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3306                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3307                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3308         }
3309
3310         /*
3311          * the ldb_message_element for the attribute, has all the old values and the new one
3312          * so we'll replace the whole attribute with all values
3313          */
3314         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3315
3316         if (DEBUGLVL(4)) {
3317                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3318                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3319                 talloc_free(s);
3320         }
3321
3322         /* prepare the ldb_modify() request */
3323         ret = ldb_build_mod_req(&change_req,
3324                                 ldb,
3325                                 ar,
3326                                 msg,
3327                                 ar->controls,
3328                                 ar,
3329                                 replmd_replicated_uptodate_modify_callback,
3330                                 ar->req);
3331         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3332
3333         return ldb_next_request(ar->module, change_req);
3334 }
3335
3336 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3337                                                       struct ldb_reply *ares)
3338 {
3339         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3340                                                struct replmd_replicated_request);
3341         int ret;
3342
3343         if (!ares) {
3344                 return ldb_module_done(ar->req, NULL, NULL,
3345                                         LDB_ERR_OPERATIONS_ERROR);
3346         }
3347         if (ares->error != LDB_SUCCESS &&
3348             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3349                 return ldb_module_done(ar->req, ares->controls,
3350                                         ares->response, ares->error);
3351         }
3352
3353         switch (ares->type) {
3354         case LDB_REPLY_ENTRY:
3355                 ar->search_msg = talloc_steal(ar, ares->message);
3356                 break;
3357
3358         case LDB_REPLY_REFERRAL:
3359                 /* we ignore referrals */
3360                 break;
3361
3362         case LDB_REPLY_DONE:
3363                 if (ar->search_msg == NULL) {
3364                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3365                 } else {
3366                         ret = replmd_replicated_uptodate_modify(ar);
3367                 }
3368                 if (ret != LDB_SUCCESS) {
3369                         return ldb_module_done(ar->req, NULL, NULL, ret);
3370                 }
3371         }
3372
3373         talloc_free(ares);
3374         return LDB_SUCCESS;
3375 }
3376
3377
3378 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3379 {
3380         struct ldb_context *ldb;
3381         int ret;
3382         static const char *attrs[] = {
3383                 "replUpToDateVector",
3384                 "repsFrom",
3385                 NULL
3386         };
3387         struct ldb_request *search_req;
3388
3389         ldb = ldb_module_get_ctx(ar->module);
3390         ar->search_msg = NULL;
3391
3392         ret = ldb_build_search_req(&search_req,
3393                                    ldb,
3394                                    ar,
3395                                    ar->objs->partition_dn,
3396                                    LDB_SCOPE_BASE,
3397                                    "(objectClass=*)",
3398                                    attrs,
3399                                    NULL,
3400                                    ar,
3401                                    replmd_replicated_uptodate_search_callback,
3402                                    ar->req);
3403         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3404
3405         return ldb_next_request(ar->module, search_req);
3406 }
3407
3408
3409
3410 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3411 {
3412         struct ldb_context *ldb;
3413         struct dsdb_extended_replicated_objects *objs;
3414         struct replmd_replicated_request *ar;
3415         struct ldb_control **ctrls;
3416         int ret;
3417         uint32_t i;
3418         struct replmd_private *replmd_private =
3419                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3420
3421         ldb = ldb_module_get_ctx(module);
3422
3423         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3424
3425         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3426         if (!objs) {
3427                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3428                 return LDB_ERR_PROTOCOL_ERROR;
3429         }
3430
3431         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3432                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3433                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3434                 return LDB_ERR_PROTOCOL_ERROR;
3435         }
3436
3437         ar = replmd_ctx_init(module, req);
3438         if (!ar)
3439                 return LDB_ERR_OPERATIONS_ERROR;
3440
3441         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3442         ar->apply_mode = true;
3443         ar->objs = objs;
3444         ar->schema = dsdb_get_schema(ldb, ar);
3445         if (!ar->schema) {
3446                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3447                 talloc_free(ar);
3448                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3449                 return LDB_ERR_CONSTRAINT_VIOLATION;
3450         }
3451
3452         ctrls = req->controls;
3453
3454         if (req->controls) {
3455                 req->controls = talloc_memdup(ar, req->controls,
3456                                               talloc_get_size(req->controls));
3457                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3458         }
3459
3460         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3461         if (ret != LDB_SUCCESS) {
3462                 return ret;
3463         }
3464
3465         ar->controls = req->controls;
3466         req->controls = ctrls;
3467
3468         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3469
3470         /* save away the linked attributes for the end of the
3471            transaction */
3472         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3473                 struct la_entry *la_entry;
3474
3475                 if (replmd_private->la_ctx == NULL) {
3476                         replmd_private->la_ctx = talloc_new(replmd_private);
3477                 }
3478                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3479                 if (la_entry == NULL) {
3480                         ldb_oom(ldb);
3481                         return LDB_ERR_OPERATIONS_ERROR;
3482                 }
3483                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3484                 if (la_entry->la == NULL) {
3485                         talloc_free(la_entry);
3486                         ldb_oom(ldb);
3487                         return LDB_ERR_OPERATIONS_ERROR;
3488                 }
3489                 *la_entry->la = ar->objs->linked_attributes[i];
3490
3491                 /* we need to steal the non-scalars so they stay
3492                    around until the end of the transaction */
3493                 talloc_steal(la_entry->la, la_entry->la->identifier);
3494                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3495
3496                 DLIST_ADD(replmd_private->la_list, la_entry);
3497         }
3498
3499         return replmd_replicated_apply_next(ar);
3500 }
3501
3502 /*
3503   process one linked attribute structure
3504  */
3505 static int replmd_process_linked_attribute(struct ldb_module *module,
3506                                            struct la_entry *la_entry)
3507 {
3508         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3509         struct ldb_context *ldb = ldb_module_get_ctx(module);
3510         struct ldb_message *msg;
3511         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3512         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
3513         int ret;
3514         const struct dsdb_attribute *attr;
3515         struct dsdb_dn *dsdb_dn;
3516         uint64_t seq_num = 0;
3517         struct ldb_message_element *old_el;
3518         WERROR status;
3519         time_t t = time(NULL);
3520         struct ldb_result *res;
3521         const char *attrs[2];
3522         struct parsed_dn *pdn_list, *pdn;
3523         struct GUID guid = GUID_zero();
3524         NTSTATUS ntstatus;
3525         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3526         const struct GUID *our_invocation_id;
3527
3528 /*
3529 linked_attributes[0]:
3530      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3531         identifier               : *
3532             identifier: struct drsuapi_DsReplicaObjectIdentifier
3533                 __ndr_size               : 0x0000003a (58)
3534                 __ndr_size_sid           : 0x00000000 (0)
3535                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3536                 sid                      : S-0-0
3537                 __ndr_size_dn            : 0x00000000 (0)
3538                 dn                       : ''
3539         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3540         value: struct drsuapi_DsAttributeValue
3541             __ndr_size               : 0x0000007e (126)
3542             blob                     : *
3543                 blob                     : DATA_BLOB length=126
3544         flags                    : 0x00000001 (1)
3545                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3546         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3547         meta_data: struct drsuapi_DsReplicaMetaData
3548             version                  : 0x00000015 (21)
3549             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3550             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3551             originating_usn          : 0x000000000001e19c (123292)
3552
3553 (for cases where the link is to a normal DN)
3554      &target: struct drsuapi_DsReplicaObjectIdentifier3
3555         __ndr_size               : 0x0000007e (126)
3556         __ndr_size_sid           : 0x0000001c (28)
3557         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3558         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3559         __ndr_size_dn            : 0x00000022 (34)
3560         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3561  */
3562
3563         /* find the attribute being modified */
3564         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3565         if (attr == NULL) {
3566                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3567                 talloc_free(tmp_ctx);
3568                 return LDB_ERR_OPERATIONS_ERROR;
3569         }
3570
3571         attrs[0] = attr->lDAPDisplayName;
3572         attrs[1] = NULL;
3573
3574         /* get the existing message from the db for the object with
3575            this GUID, returning attribute being modified. We will then
3576            use this msg as the basis for a modify call */
3577         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3578                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3579                                  DSDB_SEARCH_SHOW_DELETED |
3580                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3581                                  DSDB_SEARCH_REVEAL_INTERNALS,
3582                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3583         if (ret != LDB_SUCCESS) {
3584                 talloc_free(tmp_ctx);
3585                 return ret;
3586         }
3587         if (res->count != 1) {
3588                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3589                                        GUID_string(tmp_ctx, &la->identifier->guid));
3590                 talloc_free(tmp_ctx);
3591                 return LDB_ERR_NO_SUCH_OBJECT;
3592         }
3593         msg = res->msgs[0];
3594
3595         if (msg->num_elements == 0) {
3596                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3597                 if (ret != LDB_SUCCESS) {
3598                         ldb_module_oom(module);
3599                         talloc_free(tmp_ctx);
3600                         return LDB_ERR_OPERATIONS_ERROR;
3601                 }
3602         } else {
3603                 old_el = &msg->elements[0];
3604                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3605         }
3606
3607         /* parse the existing links */
3608         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3609         if (ret != LDB_SUCCESS) {
3610                 talloc_free(tmp_ctx);
3611                 return ret;
3612         }
3613
3614         /* get our invocationId */
3615         our_invocation_id = samdb_ntds_invocation_id(ldb);
3616         if (!our_invocation_id) {
3617                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3618                 talloc_free(tmp_ctx);
3619                 return LDB_ERR_OPERATIONS_ERROR;
3620         }
3621
3622         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, our_invocation_id);
3623         if (ret != LDB_SUCCESS) {
3624                 talloc_free(tmp_ctx);
3625                 return ret;
3626         }
3627
3628         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3629         if (!W_ERROR_IS_OK(status)) {
3630                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3631                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3632                 return LDB_ERR_OPERATIONS_ERROR;
3633         }
3634
3635         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3636         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3637                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3638                                        old_el->name,
3639                                        ldb_dn_get_linearized(dsdb_dn->dn),
3640                                        ldb_dn_get_linearized(msg->dn));
3641                 return LDB_ERR_OPERATIONS_ERROR;
3642         }
3643
3644         /* re-resolve the DN by GUID, as the DRS server may give us an
3645            old DN value */
3646         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
3647         if (ret != LDB_SUCCESS) {
3648                 ldb_asprintf_errstring(ldb, __location__ ": Failed to re-resolve GUID %s",
3649                                        GUID_string(tmp_ctx, &guid));
3650                 talloc_free(tmp_ctx);
3651                 return ret;
3652         }
3653
3654         /* see if this link already exists */
3655         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3656         if (pdn != NULL) {
3657                 /* see if this update is newer than what we have already */
3658                 struct GUID invocation_id = GUID_zero();
3659                 uint32_t version = 0;
3660                 NTTIME change_time = 0;
3661                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3662
3663                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3664                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3665                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3666
3667                 if (!replmd_update_is_newer(&invocation_id,
3668                                             &la->meta_data.originating_invocation_id,
3669                                             version,
3670                                             la->meta_data.version,
3671                                             change_time,
3672                                             la->meta_data.originating_change_time)) {
3673                         DEBUG(1,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3674                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3675                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3676                         talloc_free(tmp_ctx);
3677                         return LDB_SUCCESS;
3678                 }
3679
3680                 /* get a seq_num for this change */
3681                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3682                 if (ret != LDB_SUCCESS) {
3683                         talloc_free(tmp_ctx);
3684                         return ret;
3685                 }
3686
3687                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
3688                         /* remove the existing backlink */
3689                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3690                         if (ret != LDB_SUCCESS) {
3691                                 talloc_free(tmp_ctx);
3692                                 return ret;
3693                         }
3694                 }
3695
3696                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3697                                            &la->meta_data.originating_invocation_id,
3698                                            la->meta_data.originating_usn, seq_num,
3699                                            la->meta_data.originating_change_time,
3700                                            la->meta_data.version,
3701                                            !active);
3702                 if (ret != LDB_SUCCESS) {
3703                         talloc_free(tmp_ctx);
3704                         return ret;
3705                 }
3706
3707                 if (active) {
3708                         /* add the new backlink */
3709                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3710                         if (ret != LDB_SUCCESS) {
3711                                 talloc_free(tmp_ctx);
3712                                 return ret;
3713                         }
3714                 }
3715         } else {
3716                 /* get a seq_num for this change */
3717                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3718                 if (ret != LDB_SUCCESS) {
3719                         talloc_free(tmp_ctx);
3720                         return ret;
3721                 }
3722
3723                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3724                                                 struct ldb_val, old_el->num_values+1);
3725                 if (!old_el->values) {
3726                         ldb_module_oom(module);
3727                         return LDB_ERR_OPERATIONS_ERROR;
3728                 }
3729                 old_el->num_values++;
3730
3731                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3732                                           &la->meta_data.originating_invocation_id,
3733                                           la->meta_data.originating_usn, seq_num,
3734                                           la->meta_data.originating_change_time,
3735                                           la->meta_data.version,
3736                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3737                 if (ret != LDB_SUCCESS) {
3738                         talloc_free(tmp_ctx);
3739                         return ret;
3740                 }
3741
3742                 if (active) {
3743                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3744                                                   true, attr, false);
3745                         if (ret != LDB_SUCCESS) {
3746                                 talloc_free(tmp_ctx);
3747                                 return ret;
3748                         }
3749                 }
3750         }
3751
3752         /* we only change whenChanged and uSNChanged if the seq_num
3753            has changed */
3754         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3755                 talloc_free(tmp_ctx);
3756                 return LDB_ERR_OPERATIONS_ERROR;
3757         }
3758
3759         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3760                 talloc_free(tmp_ctx);
3761                 return LDB_ERR_OPERATIONS_ERROR;
3762         }
3763
3764         ret = dsdb_check_single_valued_link(attr, old_el);
3765         if (ret != LDB_SUCCESS) {
3766                 talloc_free(tmp_ctx);
3767                 return ret;
3768         }
3769
3770         ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
3771         if (ret != LDB_SUCCESS) {
3772                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
3773                           ldb_errstring(ldb),
3774                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
3775                 talloc_free(tmp_ctx);
3776                 return ret;
3777         }
3778
3779         talloc_free(tmp_ctx);
3780
3781         return ret;
3782 }
3783
3784 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
3785 {
3786         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
3787                 return replmd_extended_replicated_objects(module, req);
3788         }
3789
3790         return ldb_next_request(module, req);
3791 }
3792
3793
3794 /*
3795   we hook into the transaction operations to allow us to
3796   perform the linked attribute updates at the end of the whole
3797   transaction. This allows a forward linked attribute to be created
3798   before the object is created. During a vampire, w2k8 sends us linked
3799   attributes before the objects they are part of.
3800  */
3801 static int replmd_start_transaction(struct ldb_module *module)
3802 {
3803         /* create our private structure for this transaction */
3804         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
3805                                                                 struct replmd_private);
3806         replmd_txn_cleanup(replmd_private);
3807
3808         /* free any leftover mod_usn records from cancelled
3809            transactions */
3810         while (replmd_private->ncs) {
3811                 struct nc_entry *e = replmd_private->ncs;
3812                 DLIST_REMOVE(replmd_private->ncs, e);
3813                 talloc_free(e);
3814         }
3815
3816         return ldb_next_start_trans(module);
3817 }
3818
3819 /*
3820   on prepare commit we loop over our queued la_context structures and
3821   apply each of them
3822  */
3823 static int replmd_prepare_commit(struct ldb_module *module)
3824 {
3825         struct replmd_private *replmd_private =
3826                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3827         struct la_entry *la, *prev;
3828         struct la_backlink *bl;
3829         int ret;
3830
3831         /* walk the list backwards, to do the first entry first, as we
3832          * added the entries with DLIST_ADD() which puts them at the
3833          * start of the list */
3834         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
3835                 prev = DLIST_PREV(la);
3836                 DLIST_REMOVE(replmd_private->la_list, la);
3837                 ret = replmd_process_linked_attribute(module, la);
3838                 if (ret != LDB_SUCCESS) {
3839                         replmd_txn_cleanup(replmd_private);
3840                         return ret;
3841                 }
3842         }
3843
3844         /* process our backlink list, creating and deleting backlinks
3845            as necessary */
3846         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
3847                 ret = replmd_process_backlink(module, bl);
3848                 if (ret != LDB_SUCCESS) {
3849                         replmd_txn_cleanup(replmd_private);
3850                         return ret;
3851                 }
3852         }
3853
3854         replmd_txn_cleanup(replmd_private);
3855
3856         /* possibly change @REPLCHANGED */
3857         ret = replmd_notify_store(module);
3858         if (ret != LDB_SUCCESS) {
3859                 return ret;
3860         }
3861
3862         return ldb_next_prepare_commit(module);
3863 }
3864
3865 static int replmd_del_transaction(struct ldb_module *module)
3866 {
3867         struct replmd_private *replmd_private =
3868                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3869         replmd_txn_cleanup(replmd_private);
3870
3871         return ldb_next_del_trans(module);
3872 }
3873
3874
3875 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
3876         .name          = "repl_meta_data",
3877         .init_context      = replmd_init,
3878         .add               = replmd_add,
3879         .modify            = replmd_modify,
3880         .rename            = replmd_rename,
3881         .del               = replmd_delete,
3882         .extended          = replmd_extended,
3883         .start_transaction = replmd_start_transaction,
3884         .prepare_commit    = replmd_prepare_commit,
3885         .del_transaction   = replmd_del_transaction,
3886 };