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                 DEBUG(2,(__location__ ": WARNING: Failed to find target DN for linked attribute with GUID %s\n",
 217                          GUID_string(bl, &bl->target_guid)));
 218                 return LDB_SUCCESS;
 219         }
 220
 221         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
 222         if (ret != LDB_SUCCESS) {
 223                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 224                                        GUID_string(bl, &bl->forward_guid));
 225                 talloc_free(tmp_ctx);
 226                 return ret;
 227         }
 228
 229         msg = ldb_msg_new(tmp_ctx);
 230         if (msg == NULL) {
 231                 ldb_module_oom(module);
 232                 talloc_free(tmp_ctx);
 233                 return LDB_ERR_OPERATIONS_ERROR;
 234         }
 235
 236         /* construct a ldb_message for adding/deleting the backlink */
 237         msg->dn = target_dn;
 238         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 239         if (!dn_string) {
 240                 ldb_module_oom(module);
 241                 talloc_free(tmp_ctx);
 242                 return LDB_ERR_OPERATIONS_ERROR;
 243         }
 244         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 245         if (ret != LDB_SUCCESS) {
 246                 talloc_free(tmp_ctx);
 247                 return ret;
 248         }
 249         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 250
 251         ret = dsdb_module_modify(module, msg, 0);
 252         if (ret != LDB_SUCCESS) {
 253                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 254                                        bl->active?"add":"remove",
 255                                        ldb_dn_get_linearized(source_dn),
 256                                        ldb_dn_get_linearized(target_dn),
 257                                        ldb_errstring(ldb));
 258                 talloc_free(tmp_ctx);
 259                 return ret;
 260         }
 261         talloc_free(tmp_ctx);
 262         return ret;
 263 }
 264
 265 /*
 266   add a backlink to the list of backlinks to add/delete in the prepare
 267   commit
 268  */
 269 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 270                                struct GUID *forward_guid, struct GUID *target_guid,
 271                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 272 {
 273         const struct dsdb_attribute *target_attr;
 274         struct la_backlink *bl;
 275         struct replmd_private *replmd_private =
 276                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 277
 278         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 279         if (!target_attr) {
 280                 /*
 281                  * windows 2003 has a broken schema where the
 282                  * definition of msDS-IsDomainFor is missing (which is
 283                  * supposed to be the backlink of the
 284                  * msDS-HasDomainNCs attribute
 285                  */
 286                 return LDB_SUCCESS;
 287         }
 288
 289         /* see if its already in the list */
 290         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 291                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 292                     GUID_equal(target_guid, &bl->target_guid) &&
 293                     (target_attr->lDAPDisplayName == bl->attr_name ||
 294                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 295                         break;
 296                 }
 297         }
 298
 299         if (bl) {
 300                 /* we found an existing one */
 301                 if (bl->active == active) {
 302                         return LDB_SUCCESS;
 303                 }
 304                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 305                 talloc_free(bl);
 306                 return LDB_SUCCESS;
 307         }
 308
 309         if (replmd_private->bl_ctx == NULL) {
 310                 replmd_private->bl_ctx = talloc_new(replmd_private);
 311                 if (replmd_private->bl_ctx == NULL) {
 312                         ldb_module_oom(module);
 313                         return LDB_ERR_OPERATIONS_ERROR;
 314                 }
 315         }
 316
 317         /* its a new one */
 318         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 319         if (bl == NULL) {
 320                 ldb_module_oom(module);
 321                 return LDB_ERR_OPERATIONS_ERROR;
 322         }
 323
 324         /* Ensure the schema does not go away before the bl->attr_name is used */
 325         if (!talloc_reference(bl, schema)) {
 326                 talloc_free(bl);
 327                 ldb_module_oom(module);
 328                 return LDB_ERR_OPERATIONS_ERROR;
 329         }
 330
 331         bl->attr_name = target_attr->lDAPDisplayName;
 332         bl->forward_guid = *forward_guid;
 333         bl->target_guid = *target_guid;
 334         bl->active = active;
 335
 336         /* the caller may ask for this backlink to be processed
 337            immediately */
 338         if (immediate) {
 339                 int ret = replmd_process_backlink(module, bl);
 340                 talloc_free(bl);
 341                 return ret;
 342         }
 343
 344         DLIST_ADD(replmd_private->la_backlinks, bl);
 345
 346         return LDB_SUCCESS;
 347 }
 348
 349
 350 /*
 351  * Callback for most write operations in this module:
 352  *
 353  * notify the repl task that a object has changed. The notifies are
 354  * gathered up in the replmd_private structure then written to the
 355  * @REPLCHANGED object in each partition during the prepare_commit
 356  */
 357 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 358 {
 359         int ret;
 360         struct replmd_replicated_request *ac =
 361                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 362         struct replmd_private *replmd_private =
 363                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 364         struct nc_entry *modified_partition;
 365         struct ldb_control *partition_ctrl;
 366         const struct dsdb_control_current_partition *partition;
 367
 368         struct ldb_control **controls;
 369
 370         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 371
 372         /* Remove the 'partition' control from what we pass up the chain */
 373         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 374
 375         if (ares->error != LDB_SUCCESS) {
 376                 return ldb_module_done(ac->req, controls,
 377                                         ares->response, ares->error);
 378         }
 379
 380         if (ares->type != LDB_REPLY_DONE) {
 381                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 382                 return ldb_module_done(ac->req, NULL,
 383                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 384         }
 385
 386         if (!partition_ctrl) {
 387                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 388                 return ldb_module_done(ac->req, NULL,
 389                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 390         }
 391
 392         partition = talloc_get_type_abort(partition_ctrl->data,
 393                                     struct dsdb_control_current_partition);
 394
 395         if (ac->seq_num > 0) {
 396                 for (modified_partition = replmd_private->ncs; modified_partition;
 397                      modified_partition = modified_partition->next) {
 398                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 399                                 break;
 400                         }
 401                 }
 402
 403                 if (modified_partition == NULL) {
 404                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 405                         if (!modified_partition) {
 406                                 ldb_oom(ldb_module_get_ctx(ac->module));
 407                                 return ldb_module_done(ac->req, NULL,
 408                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 409                         }
 410                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 411                         if (!modified_partition->dn) {
 412                                 ldb_oom(ldb_module_get_ctx(ac->module));
 413                                 return ldb_module_done(ac->req, NULL,
 414                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 415                         }
 416                         DLIST_ADD(replmd_private->ncs, modified_partition);
 417                 }
 418
 419                 if (ac->seq_num > modified_partition->mod_usn) {
 420                         modified_partition->mod_usn = ac->seq_num;
 421                         if (ac->is_urgent) {
 422                                 modified_partition->mod_usn_urgent = ac->seq_num;
 423                         }
 424                 }
 425         }
 426
 427         if (ac->apply_mode) {
 428                 talloc_free(ares);
 429                 ac->index_current++;
 430
 431                 ret = replmd_replicated_apply_next(ac);
 432                 if (ret != LDB_SUCCESS) {
 433                         return ldb_module_done(ac->req, NULL, NULL, ret);
 434                 }
 435                 return ret;
 436         } else {
 437                 /* free the partition control container here, for the
 438                  * common path.  Other cases will have it cleaned up
 439                  * eventually with the ares */
 440                 talloc_free(partition_ctrl);
 441                 return ldb_module_done(ac->req,
 442                                        controls_except_specified(controls, ares, partition_ctrl),
 443                                        ares->response, LDB_SUCCESS);
 444         }
 445 }
 446
 447
 448 /*
 449  * update a @REPLCHANGED record in each partition if there have been
 450  * any writes of replicated data in the partition
 451  */
 452 static int replmd_notify_store(struct ldb_module *module)
 453 {
 454         struct replmd_private *replmd_private =
 455                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 456
 457         while (replmd_private->ncs) {
 458                 int ret;
 459                 struct nc_entry *modified_partition = replmd_private->ncs;
 460
 461                 ret = dsdb_module_save_partition_usn(module, modified_partition->dn,
 462                                                      modified_partition->mod_usn,
 463                                                      modified_partition->mod_usn_urgent);
 464                 if (ret != LDB_SUCCESS) {
 465                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 466                                  ldb_dn_get_linearized(modified_partition->dn)));
 467                         return ret;
 468                 }
 469                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 470                 talloc_free(modified_partition);
 471         }
 472
 473         return LDB_SUCCESS;
 474 }
 475
 476
 477 /*
 478   created a replmd_replicated_request context
 479  */
 480 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 481                                                          struct ldb_request *req)
 482 {
 483         struct ldb_context *ldb;
 484         struct replmd_replicated_request *ac;
 485
 486         ldb = ldb_module_get_ctx(module);
 487
 488         ac = talloc_zero(req, struct replmd_replicated_request);
 489         if (ac == NULL) {
 490                 ldb_oom(ldb);
 491                 return NULL;
 492         }
 493
 494         ac->module = module;
 495         ac->req = req;
 496
 497         ac->schema = dsdb_get_schema(ldb, ac);
 498         if (!ac->schema) {
 499                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 500                               "replmd_modify: no dsdb_schema loaded");
 501                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 502                 return NULL;
 503         }
 504
 505         return ac;
 506 }
 507
 508 /*
 509   add a time element to a record
 510 */
 511 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 512 {
 513         struct ldb_message_element *el;
 514         char *s;
 515
 516         if (ldb_msg_find_element(msg, attr) != NULL) {
 517                 return LDB_SUCCESS;
 518         }
 519
 520         s = ldb_timestring(msg, t);
 521         if (s == NULL) {
 522                 return LDB_ERR_OPERATIONS_ERROR;
 523         }
 524
 525         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 526                 return LDB_ERR_OPERATIONS_ERROR;
 527         }
 528
 529         el = ldb_msg_find_element(msg, attr);
 530         /* always set as replace. This works because on add ops, the flag
 531            is ignored */
 532         el->flags = LDB_FLAG_MOD_REPLACE;
 533
 534         return LDB_SUCCESS;
 535 }
 536
 537 /*
 538   add a uint64_t element to a record
 539 */
 540 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 541 {
 542         struct ldb_message_element *el;
 543
 544         if (ldb_msg_find_element(msg, attr) != NULL) {
 545                 return LDB_SUCCESS;
 546         }
 547
 548         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 549                 return LDB_ERR_OPERATIONS_ERROR;
 550         }
 551
 552         el = ldb_msg_find_element(msg, attr);
 553         /* always set as replace. This works because on add ops, the flag
 554            is ignored */
 555         el->flags = LDB_FLAG_MOD_REPLACE;
 556
 557         return LDB_SUCCESS;
 558 }
 559
 560 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 561                                                    const struct replPropertyMetaData1 *m2,
 562                                                    const uint32_t *rdn_attid)
 563 {
 564         if (m1->attid == m2->attid) {
 565                 return 0;
 566         }
 567
 568         /*
 569          * the rdn attribute should be at the end!
 570          * so we need to return a value greater than zero
 571          * which means m1 is greater than m2
 572          */
 573         if (m1->attid == *rdn_attid) {
 574                 return 1;
 575         }
 576
 577         /*
 578          * the rdn attribute should be at the end!
 579          * so we need to return a value less than zero
 580          * which means m2 is greater than m1
 581          */
 582         if (m2->attid == *rdn_attid) {
 583                 return -1;
 584         }
 585
 586         return m1->attid > m2->attid ? 1 : -1;
 587 }
 588
 589 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 590                                                 const struct dsdb_schema *schema,
 591                                                 struct ldb_dn *dn)
 592 {
 593         const char *rdn_name;
 594         const struct dsdb_attribute *rdn_sa;
 595
 596         rdn_name = ldb_dn_get_rdn_name(dn);
 597         if (!rdn_name) {
 598                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 599                 return LDB_ERR_OPERATIONS_ERROR;
 600         }
 601
 602         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 603         if (rdn_sa == NULL) {
 604                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 605                 return LDB_ERR_OPERATIONS_ERROR;
 606         }
 607
 608         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 609                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 610
 611         LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
 612
 613         return LDB_SUCCESS;
 614 }
 615
 616 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 617                                                  const struct ldb_message_element *e2,
 618                                                  const struct dsdb_schema *schema)
 619 {
 620         const struct dsdb_attribute *a1;
 621         const struct dsdb_attribute *a2;
 622
 623         /*
 624          * TODO: make this faster by caching the dsdb_attribute pointer
 625          *       on the ldb_messag_element
 626          */
 627
 628         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 629         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 630
 631         /*
 632          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 633          *       in the schema
 634          */
 635         if (!a1 || !a2) {
 636                 return strcasecmp(e1->name, e2->name);
 637         }
 638         if (a1->attributeID_id == a2->attributeID_id) {
 639                 return 0;
 640         }
 641         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 642 }
 643
 644 static void replmd_ldb_message_sort(struct ldb_message *msg,
 645                                     const struct dsdb_schema *schema)
 646 {
 647         LDB_TYPESAFE_QSORT(msg->elements, msg->num_elements, schema, replmd_ldb_message_element_attid_sort);
 648 }
 649
 650 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 651                                const struct GUID *invocation_id, uint64_t seq_num,
 652                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 653
 654
 655 /*
 656   fix up linked attributes in replmd_add.
 657   This involves setting up the right meta-data in extended DN
 658   components, and creating backlinks to the object
 659  */
 660 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 661                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 662                              struct GUID *guid, const struct dsdb_attribute *sa)
 663 {
 664         unsigned int i;
 665         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 666         struct ldb_context *ldb = ldb_module_get_ctx(module);
 667
 668         /* We will take a reference to the schema in replmd_add_backlink */
 669         const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
 670         NTTIME now;
 671
 672         unix_to_nt_time(&now, t);
 673
 674         for (i=0; i<el->num_values; i++) {
 675                 struct ldb_val *v = &el->values[i];
 676                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 677                 struct GUID target_guid;
 678                 NTSTATUS status;
 679                 int ret;
 680
 681                 /* note that the DN already has the extended
 682                    components from the extended_dn_store module */
 683                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 684                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 685                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid);
 686                         if (ret != LDB_SUCCESS) {
 687                                 talloc_free(tmp_ctx);
 688                                 return ret;
 689                         }
 690                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 691                         if (ret != LDB_SUCCESS) {
 692                                 talloc_free(tmp_ctx);
 693                                 return ret;
 694                         }
 695                 }
 696
 697                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 698                                           seq_num, seq_num, now, 0, false);
 699                 if (ret != LDB_SUCCESS) {
 700                         talloc_free(tmp_ctx);
 701                         return ret;
 702                 }
 703
 704                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 705                 if (ret != LDB_SUCCESS) {
 706                         talloc_free(tmp_ctx);
 707                         return ret;
 708                 }
 709         }
 710
 711         talloc_free(tmp_ctx);
 712         return LDB_SUCCESS;
 713 }
 714
 715
 716 /*
 717   intercept add requests
 718  */
 719 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 720 {
 721         struct ldb_context *ldb;
 722         struct ldb_control *control;
 723         struct replmd_replicated_request *ac;
 724         enum ndr_err_code ndr_err;
 725         struct ldb_request *down_req;
 726         struct ldb_message *msg;
 727         const DATA_BLOB *guid_blob;
 728         struct GUID guid;
 729         struct replPropertyMetaDataBlob nmd;
 730         struct ldb_val nmd_value;
 731         const struct GUID *our_invocation_id;
 732         time_t t = time(NULL);
 733         NTTIME now;
 734         char *time_str;
 735         int ret;
 736         unsigned int i;
 737         uint32_t ni=0;
 738         bool allow_add_guid = false;
 739         bool remove_current_guid = false;
 740         bool is_urgent = false;
 741         struct ldb_message_element *objectclass_el;
 742
 743         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 744         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 745         if (control) {
 746                 allow_add_guid = true;
 747         }
 748
 749         /* do not manipulate our control entries */
 750         if (ldb_dn_is_special(req->op.add.message->dn)) {
 751                 return ldb_next_request(module, req);
 752         }
 753
 754         ldb = ldb_module_get_ctx(module);
 755
 756         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 757
 758         ac = replmd_ctx_init(module, req);
 759         if (!ac) {
 760                 return LDB_ERR_OPERATIONS_ERROR;
 761         }
 762
 763         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 764         if ( guid_blob != NULL ) {
 765                 if( !allow_add_guid ) {
 766                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 767                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 768                         talloc_free(ac);
 769                         return LDB_ERR_UNWILLING_TO_PERFORM;
 770                 } else {
 771                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 772                         if ( !NT_STATUS_IS_OK(status)) {
 773                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 774                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 775                                 talloc_free(ac);
 776                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 777                         }
 778                         /* we remove this attribute as it can be a string and will not be treated
 779                         correctly and then we will readd it latter on in the good format*/
 780                         remove_current_guid = true;
 781                 }
 782         } else {
 783                 /* a new GUID */
 784                 guid = GUID_random();
 785         }
 786
 787         /* Get a sequence number from the backend */
 788         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 789         if (ret != LDB_SUCCESS) {
 790                 talloc_free(ac);
 791                 return ret;
 792         }
 793
 794         /* get our invocationId */
 795         our_invocation_id = samdb_ntds_invocation_id(ldb);
 796         if (!our_invocation_id) {
 797                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 798                               "replmd_add: unable to find invocationId\n");
 799                 talloc_free(ac);
 800                 return LDB_ERR_OPERATIONS_ERROR;
 801         }
 802
 803         /* we have to copy the message as the caller might have it as a const */
 804         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 805         if (msg == NULL) {
 806                 ldb_oom(ldb);
 807                 talloc_free(ac);
 808                 return LDB_ERR_OPERATIONS_ERROR;
 809         }
 810
 811         /* generated times */
 812         unix_to_nt_time(&now, t);
 813         time_str = ldb_timestring(msg, t);
 814         if (!time_str) {
 815                 ldb_oom(ldb);
 816                 talloc_free(ac);
 817                 return LDB_ERR_OPERATIONS_ERROR;
 818         }
 819         if (remove_current_guid) {
 820                 ldb_msg_remove_attr(msg,"objectGUID");
 821         }
 822
 823         /*
 824          * remove autogenerated attributes
 825          */
 826         ldb_msg_remove_attr(msg, "whenCreated");
 827         ldb_msg_remove_attr(msg, "whenChanged");
 828         ldb_msg_remove_attr(msg, "uSNCreated");
 829         ldb_msg_remove_attr(msg, "uSNChanged");
 830         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 831
 832         /*
 833          * readd replicated attributes
 834          */
 835         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 836         if (ret != LDB_SUCCESS) {
 837                 ldb_oom(ldb);
 838                 talloc_free(ac);
 839                 return ret;
 840         }
 841
 842         /* build the replication meta_data */
 843         ZERO_STRUCT(nmd);
 844         nmd.version             = 1;
 845         nmd.ctr.ctr1.count      = msg->num_elements;
 846         nmd.ctr.ctr1.array      = talloc_array(msg,
 847                                                struct replPropertyMetaData1,
 848                                                nmd.ctr.ctr1.count);
 849         if (!nmd.ctr.ctr1.array) {
 850                 ldb_oom(ldb);
 851                 talloc_free(ac);
 852                 return LDB_ERR_OPERATIONS_ERROR;
 853         }
 854
 855         for (i=0; i < msg->num_elements; i++) {
 856                 struct ldb_message_element *e = &msg->elements[i];
 857                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 858                 const struct dsdb_attribute *sa;
 859
 860                 if (e->name[0] == '@') continue;
 861
 862                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 863                 if (!sa) {
 864                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 865                                       "replmd_add: attribute '%s' not defined in schema\n",
 866                                       e->name);
 867                         talloc_free(ac);
 868                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 869                 }
 870
 871                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 872                         /* if the attribute is not replicated (0x00000001)
 873                          * or constructed (0x00000004) it has no metadata
 874                          */
 875                         continue;
 876                 }
 877
 878 #if W2K3_LINKED_ATTRIBUTES
 879                 if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 880                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 881                         if (ret != LDB_SUCCESS) {
 882                                 talloc_free(ac);
 883                                 return ret;
 884                         }
 885                         /* linked attributes are not stored in
 886                            replPropertyMetaData in FL above w2k */
 887                         continue;
 888                 }
 889 #endif
 890
 891                 m->attid                        = sa->attributeID_id;
 892                 m->version                      = 1;
 893                 m->originating_change_time      = now;
 894                 m->originating_invocation_id    = *our_invocation_id;
 895                 m->originating_usn              = ac->seq_num;
 896                 m->local_usn                    = ac->seq_num;
 897                 ni++;
 898         }
 899
 900         /* fix meta data count */
 901         nmd.ctr.ctr1.count = ni;
 902
 903         /*
 904          * sort meta data array, and move the rdn attribute entry to the end
 905          */
 906         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 907         if (ret != LDB_SUCCESS) {
 908                 talloc_free(ac);
 909                 return ret;
 910         }
 911
 912         /* generated NDR encoded values */
 913         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 914                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 915                                        &nmd,
 916                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 917         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 918                 ldb_oom(ldb);
 919                 talloc_free(ac);
 920                 return LDB_ERR_OPERATIONS_ERROR;
 921         }
 922
 923         /*
 924          * add the autogenerated values
 925          */
 926         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 927         if (ret != LDB_SUCCESS) {
 928                 ldb_oom(ldb);
 929                 talloc_free(ac);
 930                 return ret;
 931         }
 932         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 933         if (ret != LDB_SUCCESS) {
 934                 ldb_oom(ldb);
 935                 talloc_free(ac);
 936                 return ret;
 937         }
 938         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 939         if (ret != LDB_SUCCESS) {
 940                 ldb_oom(ldb);
 941                 talloc_free(ac);
 942                 return ret;
 943         }
 944         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 945         if (ret != LDB_SUCCESS) {
 946                 ldb_oom(ldb);
 947                 talloc_free(ac);
 948                 return ret;
 949         }
 950         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 951         if (ret != LDB_SUCCESS) {
 952                 ldb_oom(ldb);
 953                 talloc_free(ac);
 954                 return ret;
 955         }
 956
 957         /*
 958          * sort the attributes by attid before storing the object
 959          */
 960         replmd_ldb_message_sort(msg, ac->schema);
 961
 962         objectclass_el = ldb_msg_find_element(msg, "objectClass");
 963         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
 964                                                         REPL_URGENT_ON_CREATE);
 965
 966         ac->is_urgent = is_urgent;
 967         ret = ldb_build_add_req(&down_req, ldb, ac,
 968                                 msg,
 969                                 req->controls,
 970                                 ac, replmd_op_callback,
 971                                 req);
 972
 973         if (ret != LDB_SUCCESS) {
 974                 talloc_free(ac);
 975                 return ret;
 976         }
 977
 978         /* mark the control done */
 979         if (control) {
 980                 control->critical = 0;
 981         }
 982
 983         /* go on with the call chain */
 984         return ldb_next_request(module, down_req);
 985 }
 986
 987
 988 /*
 989  * update the replPropertyMetaData for one element
 990  */
 991 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 992                                       struct ldb_message *msg,
 993                                       struct ldb_message_element *el,
 994                                       struct ldb_message_element *old_el,
 995                                       struct replPropertyMetaDataBlob *omd,
 996                                       const struct dsdb_schema *schema,
 997                                       uint64_t *seq_num,
 998                                       const struct GUID *our_invocation_id,
 999                                       NTTIME now)
1000 {
1001         uint32_t i;
1002         const struct dsdb_attribute *a;
1003         struct replPropertyMetaData1 *md1;
1004
1005         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1006         if (a == NULL) {
1007                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1008                          el->name));
1009                 return LDB_ERR_OPERATIONS_ERROR;
1010         }
1011
1012         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1013                 return LDB_SUCCESS;
1014         }
1015
1016         /* if the attribute's value haven't changed then return LDB_SUCCESS     */
1017         if (old_el != NULL && ldb_msg_element_compare(el, old_el) == 0) {
1018                 return LDB_SUCCESS;
1019         }
1020
1021         for (i=0; i<omd->ctr.ctr1.count; i++) {
1022                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1023         }
1024
1025 #if W2K3_LINKED_ATTRIBUTES
1026         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1027                 /* linked attributes are not stored in
1028                    replPropertyMetaData in FL above w2k, but we do
1029                    raise the seqnum for the object  */
1030                 if (*seq_num == 0 &&
1031                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1032                         return LDB_ERR_OPERATIONS_ERROR;
1033                 }
1034                 return LDB_SUCCESS;
1035         }
1036 #endif
1037
1038         if (i == omd->ctr.ctr1.count) {
1039                 /* we need to add a new one */
1040                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1041                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1042                 if (omd->ctr.ctr1.array == NULL) {
1043                         ldb_oom(ldb);
1044                         return LDB_ERR_OPERATIONS_ERROR;
1045                 }
1046                 omd->ctr.ctr1.count++;
1047                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1048         }
1049
1050         /* Get a new sequence number from the backend. We only do this
1051          * if we have a change that requires a new
1052          * replPropertyMetaData element
1053          */
1054         if (*seq_num == 0) {
1055                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1056                 if (ret != LDB_SUCCESS) {
1057                         return LDB_ERR_OPERATIONS_ERROR;
1058                 }
1059         }
1060
1061         md1 = &omd->ctr.ctr1.array[i];
1062         md1->version++;
1063         md1->attid                     = a->attributeID_id;
1064         md1->originating_change_time   = now;
1065         md1->originating_invocation_id = *our_invocation_id;
1066         md1->originating_usn           = *seq_num;
1067         md1->local_usn                 = *seq_num;
1068
1069         return LDB_SUCCESS;
1070 }
1071
1072 /*
1073  * update the replPropertyMetaData object each time we modify an
1074  * object. This is needed for DRS replication, as the merge on the
1075  * client is based on this object
1076  */
1077 static int replmd_update_rpmd(struct ldb_module *module,
1078                               const struct dsdb_schema *schema,
1079                               struct ldb_request *req,
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         bool rodc;
1097
1098         ldb = ldb_module_get_ctx(module);
1099
1100         our_invocation_id = samdb_ntds_invocation_id(ldb);
1101         if (!our_invocation_id) {
1102                 /* this happens during an initial vampire while
1103                    updating the schema */
1104                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1105                 return LDB_SUCCESS;
1106         }
1107
1108         unix_to_nt_time(&now, t);
1109
1110         /* search for the existing replPropertyMetaDataBlob. We need
1111          * to use REVEAL and ask for DNs in storage format to support
1112          * the check for values being the same in
1113          * replmd_update_rpmd_element()
1114          */
1115         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
1116                                     DSDB_SEARCH_SHOW_DELETED |
1117                                     DSDB_SEARCH_SHOW_EXTENDED_DN |
1118                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1119                                     DSDB_SEARCH_REVEAL_INTERNALS);
1120         if (ret != LDB_SUCCESS || res->count != 1) {
1121                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1122                          ldb_dn_get_linearized(msg->dn)));
1123                 return LDB_ERR_OPERATIONS_ERROR;
1124         }
1125
1126         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1127          * otherwise we consider we are updating */
1128         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1129                 situation = REPL_URGENT_ON_DELETE;
1130         } else {
1131                 situation = REPL_URGENT_ON_UPDATE;
1132         }
1133
1134         objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1135         if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1136                                                         situation)) {
1137                 *is_urgent = true;
1138         }
1139
1140         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1141         if (!omd_value) {
1142                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1143                          ldb_dn_get_linearized(msg->dn)));
1144                 return LDB_ERR_OPERATIONS_ERROR;
1145         }
1146
1147         ndr_err = ndr_pull_struct_blob(omd_value, msg,
1148                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
1149                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1150         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1151                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1152                          ldb_dn_get_linearized(msg->dn)));
1153                 return LDB_ERR_OPERATIONS_ERROR;
1154         }
1155
1156         if (omd.version != 1) {
1157                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1158                          omd.version, ldb_dn_get_linearized(msg->dn)));
1159                 return LDB_ERR_OPERATIONS_ERROR;
1160         }
1161
1162         /*we have elements that will be modified*/
1163         if (msg->num_elements > 0) {
1164                 /*if we are RODC and this is a DRSR update then its ok*/
1165                 if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
1166                         ret = samdb_rodc(ldb, &rodc);
1167                         if (ret != LDB_SUCCESS) {
1168                                 DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
1169                         } else if (rodc) {
1170                                 ldb_asprintf_errstring(ldb, "RODC modify is forbidden\n");
1171                                 return LDB_ERR_REFERRAL;
1172                         }
1173                 }
1174         }
1175
1176         for (i=0; i<msg->num_elements; i++) {
1177                 struct ldb_message_element *old_el;
1178                 old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1179                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1180                                                  our_invocation_id, now);
1181                 if (ret != LDB_SUCCESS) {
1182                         return ret;
1183                 }
1184
1185                 if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1186                         *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1187                 }
1188
1189         }
1190
1191         /*
1192          * replmd_update_rpmd_element has done an update if the
1193          * seq_num is set
1194          */
1195         if (*seq_num != 0) {
1196                 struct ldb_val *md_value;
1197                 struct ldb_message_element *el;
1198
1199                 md_value = talloc(msg, struct ldb_val);
1200                 if (md_value == NULL) {
1201                         ldb_oom(ldb);
1202                         return LDB_ERR_OPERATIONS_ERROR;
1203                 }
1204
1205                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1206                 if (ret != LDB_SUCCESS) {
1207                         return ret;
1208                 }
1209
1210                 ndr_err = ndr_push_struct_blob(md_value, msg,
1211                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1212                                                &omd,
1213                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1214                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1215                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1216                                  ldb_dn_get_linearized(msg->dn)));
1217                         return LDB_ERR_OPERATIONS_ERROR;
1218                 }
1219
1220                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1221                 if (ret != LDB_SUCCESS) {
1222                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1223                                  ldb_dn_get_linearized(msg->dn)));
1224                         return ret;
1225                 }
1226
1227                 el->num_values = 1;
1228                 el->values = md_value;
1229         }
1230
1231         return LDB_SUCCESS;
1232 }
1233
1234 struct parsed_dn {
1235         struct dsdb_dn *dsdb_dn;
1236         struct GUID *guid;
1237         struct ldb_val *v;
1238 };
1239
1240 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1241 {
1242         return GUID_compare(pdn1->guid, pdn2->guid);
1243 }
1244
1245 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1246 {
1247         struct parsed_dn *ret;
1248         if (dn && GUID_all_zero(guid)) {
1249                 /* when updating a link using DRS, we sometimes get a
1250                    NULL GUID. We then need to try and match by DN */
1251                 int i;
1252                 for (i=0; i<count; i++) {
1253                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1254                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1255                                 return &pdn[i];
1256                         }
1257                 }
1258                 return NULL;
1259         }
1260         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1261         return ret;
1262 }
1263
1264 /*
1265   get a series of message element values as an array of DNs and GUIDs
1266   the result is sorted by GUID
1267  */
1268 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1269                           struct ldb_message_element *el, struct parsed_dn **pdn,
1270                           const char *ldap_oid)
1271 {
1272         unsigned int i;
1273         struct ldb_context *ldb = ldb_module_get_ctx(module);
1274
1275         if (el == NULL) {
1276                 *pdn = NULL;
1277                 return LDB_SUCCESS;
1278         }
1279
1280         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1281         if (!*pdn) {
1282                 ldb_module_oom(module);
1283                 return LDB_ERR_OPERATIONS_ERROR;
1284         }
1285
1286         for (i=0; i<el->num_values; i++) {
1287                 struct ldb_val *v = &el->values[i];
1288                 NTSTATUS status;
1289                 struct ldb_dn *dn;
1290                 struct parsed_dn *p;
1291
1292                 p = &(*pdn)[i];
1293
1294                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1295                 if (p->dsdb_dn == NULL) {
1296                         return LDB_ERR_INVALID_DN_SYNTAX;
1297                 }
1298
1299                 dn = p->dsdb_dn->dn;
1300
1301                 p->guid = talloc(*pdn, struct GUID);
1302                 if (p->guid == NULL) {
1303                         ldb_module_oom(module);
1304                         return LDB_ERR_OPERATIONS_ERROR;
1305                 }
1306
1307                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1308                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1309                         /* we got a DN without a GUID - go find the GUID */
1310                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1311                         if (ret != LDB_SUCCESS) {
1312                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1313                                                        ldb_dn_get_linearized(dn));
1314                                 return ret;
1315                         }
1316                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1317                         if (ret != LDB_SUCCESS) {
1318                                 return ret;
1319                         }
1320                 } else if (!NT_STATUS_IS_OK(status)) {
1321                         return LDB_ERR_OPERATIONS_ERROR;
1322                 }
1323
1324                 /* keep a pointer to the original ldb_val */
1325                 p->v = v;
1326         }
1327
1328         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1329
1330         return LDB_SUCCESS;
1331 }
1332
1333 /*
1334   build a new extended DN, including all meta data fields
1335
1336   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1337   RMD_ADDTIME         = originating_add_time
1338   RMD_INVOCID         = originating_invocation_id
1339   RMD_CHANGETIME      = originating_change_time
1340   RMD_ORIGINATING_USN = originating_usn
1341   RMD_LOCAL_USN       = local_usn
1342   RMD_VERSION         = version
1343  */
1344 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1345                                const struct GUID *invocation_id, uint64_t seq_num,
1346                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1347 {
1348         struct ldb_dn *dn = dsdb_dn->dn;
1349         const char *tstring, *usn_string, *flags_string;
1350         struct ldb_val tval;
1351         struct ldb_val iid;
1352         struct ldb_val usnv, local_usnv;
1353         struct ldb_val vers, flagsv;
1354         NTSTATUS status;
1355         int ret;
1356         const char *dnstring;
1357         char *vstring;
1358         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1359
1360         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1361         if (!tstring) {
1362                 return LDB_ERR_OPERATIONS_ERROR;
1363         }
1364         tval = data_blob_string_const(tstring);
1365
1366         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1367         if (!usn_string) {
1368                 return LDB_ERR_OPERATIONS_ERROR;
1369         }
1370         usnv = data_blob_string_const(usn_string);
1371
1372         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1373         if (!usn_string) {
1374                 return LDB_ERR_OPERATIONS_ERROR;
1375         }
1376         local_usnv = data_blob_string_const(usn_string);
1377
1378         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1379         if (!vstring) {
1380                 return LDB_ERR_OPERATIONS_ERROR;
1381         }
1382         vers = data_blob_string_const(vstring);
1383
1384         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1385         if (!NT_STATUS_IS_OK(status)) {
1386                 return LDB_ERR_OPERATIONS_ERROR;
1387         }
1388
1389         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1390         if (!flags_string) {
1391                 return LDB_ERR_OPERATIONS_ERROR;
1392         }
1393         flagsv = data_blob_string_const(flags_string);
1394
1395         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1396         if (ret != LDB_SUCCESS) return ret;
1397         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1398         if (ret != LDB_SUCCESS) return ret;
1399         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1400         if (ret != LDB_SUCCESS) return ret;
1401         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1402         if (ret != LDB_SUCCESS) return ret;
1403         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1404         if (ret != LDB_SUCCESS) return ret;
1405         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1406         if (ret != LDB_SUCCESS) return ret;
1407         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1408         if (ret != LDB_SUCCESS) return ret;
1409
1410         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1411         if (dnstring == NULL) {
1412                 return LDB_ERR_OPERATIONS_ERROR;
1413         }
1414         *v = data_blob_string_const(dnstring);
1415
1416         return LDB_SUCCESS;
1417 }
1418
1419 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1420                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1421                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1422                                 uint32_t version, bool deleted);
1423
1424 /*
1425   check if any links need upgrading from w2k format
1426
1427   The parent_ctx is the ldb_message_element which contains the values array that dns[i].v points at, and which should be used for allocating any new value.
1428  */
1429 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1430 {
1431         uint32_t i;
1432         for (i=0; i<count; i++) {
1433                 NTSTATUS status;
1434                 uint32_t version;
1435                 int ret;
1436
1437                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1438                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1439                         continue;
1440                 }
1441
1442                 /* it's an old one that needs upgrading */
1443                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1444                                            1, 1, 0, 0, false);
1445                 if (ret != LDB_SUCCESS) {
1446                         return ret;
1447                 }
1448         }
1449         return LDB_SUCCESS;
1450 }
1451
1452 /*
1453   update an extended DN, including all meta data fields
1454
1455   see replmd_build_la_val for value names
1456  */
1457 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1458                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1459                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1460                                 uint32_t version, bool deleted)
1461 {
1462         struct ldb_dn *dn = dsdb_dn->dn;
1463         const char *tstring, *usn_string, *flags_string;
1464         struct ldb_val tval;
1465         struct ldb_val iid;
1466         struct ldb_val usnv, local_usnv;
1467         struct ldb_val vers, flagsv;
1468         const struct ldb_val *old_addtime;
1469         uint32_t old_version;
1470         NTSTATUS status;
1471         int ret;
1472         const char *dnstring;
1473         char *vstring;
1474         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1475
1476         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1477         if (!tstring) {
1478                 return LDB_ERR_OPERATIONS_ERROR;
1479         }
1480         tval = data_blob_string_const(tstring);
1481
1482         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1483         if (!usn_string) {
1484                 return LDB_ERR_OPERATIONS_ERROR;
1485         }
1486         usnv = data_blob_string_const(usn_string);
1487
1488         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1489         if (!usn_string) {
1490                 return LDB_ERR_OPERATIONS_ERROR;
1491         }
1492         local_usnv = data_blob_string_const(usn_string);
1493
1494         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1495         if (!NT_STATUS_IS_OK(status)) {
1496                 return LDB_ERR_OPERATIONS_ERROR;
1497         }
1498
1499         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1500         if (!flags_string) {
1501                 return LDB_ERR_OPERATIONS_ERROR;
1502         }
1503         flagsv = data_blob_string_const(flags_string);
1504
1505         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1506         if (ret != LDB_SUCCESS) return ret;
1507
1508         /* get the ADDTIME from the original */
1509         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1510         if (old_addtime == NULL) {
1511                 old_addtime = &tval;
1512         }
1513         if (dsdb_dn != old_dsdb_dn) {
1514                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1515                 if (ret != LDB_SUCCESS) return ret;
1516         }
1517
1518         /* use our invocation id */
1519         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1520         if (ret != LDB_SUCCESS) return ret;
1521
1522         /* changetime is the current time */
1523         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1524         if (ret != LDB_SUCCESS) return ret;
1525
1526         /* update the USN */
1527         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1528         if (ret != LDB_SUCCESS) return ret;
1529
1530         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1531         if (ret != LDB_SUCCESS) return ret;
1532
1533         /* increase the version by 1 */
1534         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1535         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1536                 version = old_version+1;
1537         }
1538         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1539         vers = data_blob_string_const(vstring);
1540         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1541         if (ret != LDB_SUCCESS) return ret;
1542
1543         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1544         if (dnstring == NULL) {
1545                 return LDB_ERR_OPERATIONS_ERROR;
1546         }
1547         *v = data_blob_string_const(dnstring);
1548
1549         return LDB_SUCCESS;
1550 }
1551
1552 /*
1553   handle adding a linked attribute
1554  */
1555 static int replmd_modify_la_add(struct ldb_module *module,
1556                                 const struct dsdb_schema *schema,
1557                                 struct ldb_message *msg,
1558                                 struct ldb_message_element *el,
1559                                 struct ldb_message_element *old_el,
1560                                 const struct dsdb_attribute *schema_attr,
1561                                 uint64_t seq_num,
1562                                 time_t t,
1563                                 struct GUID *msg_guid)
1564 {
1565         unsigned int i;
1566         struct parsed_dn *dns, *old_dns;
1567         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1568         int ret;
1569         struct ldb_val *new_values = NULL;
1570         unsigned int num_new_values = 0;
1571         unsigned old_num_values = old_el?old_el->num_values:0;
1572         const struct GUID *invocation_id;
1573         struct ldb_context *ldb = ldb_module_get_ctx(module);
1574         NTTIME now;
1575
1576         unix_to_nt_time(&now, t);
1577
1578         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1579         if (ret != LDB_SUCCESS) {
1580                 talloc_free(tmp_ctx);
1581                 return ret;
1582         }
1583
1584         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1585         if (ret != LDB_SUCCESS) {
1586                 talloc_free(tmp_ctx);
1587                 return ret;
1588         }
1589
1590         invocation_id = samdb_ntds_invocation_id(ldb);
1591         if (!invocation_id) {
1592                 talloc_free(tmp_ctx);
1593                 return LDB_ERR_OPERATIONS_ERROR;
1594         }
1595
1596         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1597         if (ret != LDB_SUCCESS) {
1598                 talloc_free(tmp_ctx);
1599                 return ret;
1600         }
1601
1602         /* for each new value, see if it exists already with the same GUID */
1603         for (i=0; i<el->num_values; i++) {
1604                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1605                 if (p == NULL) {
1606                         /* this is a new linked attribute value */
1607                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1608                         if (new_values == NULL) {
1609                                 ldb_module_oom(module);
1610                                 talloc_free(tmp_ctx);
1611                                 return LDB_ERR_OPERATIONS_ERROR;
1612                         }
1613                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1614                                                   invocation_id, seq_num, seq_num, now, 0, false);
1615                         if (ret != LDB_SUCCESS) {
1616                                 talloc_free(tmp_ctx);
1617                                 return ret;
1618                         }
1619                         num_new_values++;
1620                 } else {
1621                         /* this is only allowed if the GUID was
1622                            previously deleted. */
1623                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1624
1625                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1626                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1627                                                        el->name, GUID_string(tmp_ctx, p->guid));
1628                                 talloc_free(tmp_ctx);
1629                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1630                         }
1631                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1632                                                    invocation_id, seq_num, seq_num, now, 0, false);
1633                         if (ret != LDB_SUCCESS) {
1634                                 talloc_free(tmp_ctx);
1635                                 return ret;
1636                         }
1637                 }
1638
1639                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1640                 if (ret != LDB_SUCCESS) {
1641                         talloc_free(tmp_ctx);
1642                         return ret;
1643                 }
1644         }
1645
1646         /* add the new ones on to the end of the old values, constructing a new el->values */
1647         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1648                                     struct ldb_val,
1649                                     old_num_values+num_new_values);
1650         if (el->values == NULL) {
1651                 ldb_module_oom(module);
1652                 return LDB_ERR_OPERATIONS_ERROR;
1653         }
1654
1655         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1656         el->num_values = old_num_values + num_new_values;
1657
1658         talloc_steal(msg->elements, el->values);
1659         talloc_steal(el->values, new_values);
1660
1661         talloc_free(tmp_ctx);
1662
1663         /* we now tell the backend to replace all existing values
1664            with the one we have constructed */
1665         el->flags = LDB_FLAG_MOD_REPLACE;
1666
1667         return LDB_SUCCESS;
1668 }
1669
1670
1671 /*
1672   handle deleting all active linked attributes
1673  */
1674 static int replmd_modify_la_delete(struct ldb_module *module,
1675                                    const struct dsdb_schema *schema,
1676                                    struct ldb_message *msg,
1677                                    struct ldb_message_element *el,
1678                                    struct ldb_message_element *old_el,
1679                                    const struct dsdb_attribute *schema_attr,
1680                                    uint64_t seq_num,
1681                                    time_t t,
1682                                    struct GUID *msg_guid)
1683 {
1684         unsigned int i;
1685         struct parsed_dn *dns, *old_dns;
1686         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1687         int ret;
1688         const struct GUID *invocation_id;
1689         struct ldb_context *ldb = ldb_module_get_ctx(module);
1690         NTTIME now;
1691
1692         unix_to_nt_time(&now, t);
1693
1694         /* check if there is nothing to delete */
1695         if ((!old_el || old_el->num_values == 0) &&
1696             el->num_values == 0) {
1697                 return LDB_SUCCESS;
1698         }
1699
1700         if (!old_el || old_el->num_values == 0) {
1701                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1702         }
1703
1704         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1705         if (ret != LDB_SUCCESS) {
1706                 talloc_free(tmp_ctx);
1707                 return ret;
1708         }
1709
1710         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1711         if (ret != LDB_SUCCESS) {
1712                 talloc_free(tmp_ctx);
1713                 return ret;
1714         }
1715
1716         invocation_id = samdb_ntds_invocation_id(ldb);
1717         if (!invocation_id) {
1718                 return LDB_ERR_OPERATIONS_ERROR;
1719         }
1720
1721         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
1722         if (ret != LDB_SUCCESS) {
1723                 talloc_free(tmp_ctx);
1724                 return ret;
1725         }
1726
1727         el->values = NULL;
1728
1729         /* see if we are being asked to delete any links that
1730            don't exist or are already deleted */
1731         for (i=0; i<el->num_values; i++) {
1732                 struct parsed_dn *p = &dns[i];
1733                 struct parsed_dn *p2;
1734                 uint32_t rmd_flags;
1735
1736                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1737                 if (!p2) {
1738                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1739                                                el->name, GUID_string(tmp_ctx, p->guid));
1740                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1741                 }
1742                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1743                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1744                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1745                                                el->name, GUID_string(tmp_ctx, p->guid));
1746                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1747                 }
1748         }
1749
1750         /* for each new value, see if it exists already with the same GUID
1751            if it is not already deleted and matches the delete list then delete it
1752         */
1753         for (i=0; i<old_el->num_values; i++) {
1754                 struct parsed_dn *p = &old_dns[i];
1755                 uint32_t rmd_flags;
1756
1757                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1758                         continue;
1759                 }
1760
1761                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1762                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1763
1764                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1765                                            invocation_id, seq_num, seq_num, now, 0, true);
1766                 if (ret != LDB_SUCCESS) {
1767                         talloc_free(tmp_ctx);
1768                         return ret;
1769                 }
1770
1771                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1772                 if (ret != LDB_SUCCESS) {
1773                         talloc_free(tmp_ctx);
1774                         return ret;
1775                 }
1776         }
1777
1778         el->values = talloc_steal(msg->elements, old_el->values);
1779         el->num_values = old_el->num_values;
1780
1781         talloc_free(tmp_ctx);
1782
1783         /* we now tell the backend to replace all existing values
1784            with the one we have constructed */
1785         el->flags = LDB_FLAG_MOD_REPLACE;
1786
1787         return LDB_SUCCESS;
1788 }
1789
1790 /*
1791   handle replacing a linked attribute
1792  */
1793 static int replmd_modify_la_replace(struct ldb_module *module,
1794                                     const struct dsdb_schema *schema,
1795                                     struct ldb_message *msg,
1796                                     struct ldb_message_element *el,
1797                                     struct ldb_message_element *old_el,
1798                                     const struct dsdb_attribute *schema_attr,
1799                                     uint64_t seq_num,
1800                                     time_t t,
1801                                     struct GUID *msg_guid)
1802 {
1803         unsigned int i;
1804         struct parsed_dn *dns, *old_dns;
1805         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1806         int ret;
1807         const struct GUID *invocation_id;
1808         struct ldb_context *ldb = ldb_module_get_ctx(module);
1809         struct ldb_val *new_values = NULL;
1810         unsigned int num_new_values = 0;
1811         unsigned int old_num_values = old_el?old_el->num_values:0;
1812         NTTIME now;
1813
1814         unix_to_nt_time(&now, t);
1815
1816         /* check if there is nothing to replace */
1817         if ((!old_el || old_el->num_values == 0) &&
1818             el->num_values == 0) {
1819                 return LDB_SUCCESS;
1820         }
1821
1822         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1823         if (ret != LDB_SUCCESS) {
1824                 talloc_free(tmp_ctx);
1825                 return ret;
1826         }
1827
1828         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1829         if (ret != LDB_SUCCESS) {
1830                 talloc_free(tmp_ctx);
1831                 return ret;
1832         }
1833
1834         invocation_id = samdb_ntds_invocation_id(ldb);
1835         if (!invocation_id) {
1836                 return LDB_ERR_OPERATIONS_ERROR;
1837         }
1838
1839         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1840         if (ret != LDB_SUCCESS) {
1841                 talloc_free(tmp_ctx);
1842                 return ret;
1843         }
1844
1845         /* mark all the old ones as deleted */
1846         for (i=0; i<old_num_values; i++) {
1847                 struct parsed_dn *old_p = &old_dns[i];
1848                 struct parsed_dn *p;
1849                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1850
1851                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1852
1853                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1854                 if (ret != LDB_SUCCESS) {
1855                         talloc_free(tmp_ctx);
1856                         return ret;
1857                 }
1858
1859                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1860                 if (p) {
1861                         /* we don't delete it if we are re-adding it */
1862                         continue;
1863                 }
1864
1865                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1866                                            invocation_id, seq_num, seq_num, now, 0, true);
1867                 if (ret != LDB_SUCCESS) {
1868                         talloc_free(tmp_ctx);
1869                         return ret;
1870                 }
1871         }
1872
1873         /* for each new value, either update its meta-data, or add it
1874          * to old_el
1875         */
1876         for (i=0; i<el->num_values; i++) {
1877                 struct parsed_dn *p = &dns[i], *old_p;
1878
1879                 if (old_dns &&
1880                     (old_p = parsed_dn_find(old_dns,
1881                                             old_num_values, p->guid, NULL)) != NULL) {
1882                         /* update in place */
1883                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1884                                                    old_p->dsdb_dn, invocation_id,
1885                                                    seq_num, seq_num, now, 0, false);
1886                         if (ret != LDB_SUCCESS) {
1887                                 talloc_free(tmp_ctx);
1888                                 return ret;
1889                         }
1890                 } else {
1891                         /* add a new one */
1892                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1893                                                     num_new_values+1);
1894                         if (new_values == NULL) {
1895                                 ldb_module_oom(module);
1896                                 talloc_free(tmp_ctx);
1897                                 return LDB_ERR_OPERATIONS_ERROR;
1898                         }
1899                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1900                                                   invocation_id, seq_num, seq_num, now, 0, false);
1901                         if (ret != LDB_SUCCESS) {
1902                                 talloc_free(tmp_ctx);
1903                                 return ret;
1904                         }
1905                         num_new_values++;
1906                 }
1907
1908                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1909                 if (ret != LDB_SUCCESS) {
1910                         talloc_free(tmp_ctx);
1911                         return ret;
1912                 }
1913         }
1914
1915         /* add the new values to the end of old_el */
1916         if (num_new_values != 0) {
1917                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1918                                             struct ldb_val, old_num_values+num_new_values);
1919                 if (el->values == NULL) {
1920                         ldb_module_oom(module);
1921                         return LDB_ERR_OPERATIONS_ERROR;
1922                 }
1923                 memcpy(&el->values[old_num_values], &new_values[0],
1924                        sizeof(struct ldb_val)*num_new_values);
1925                 el->num_values = old_num_values + num_new_values;
1926                 talloc_steal(msg->elements, new_values);
1927         } else {
1928                 el->values = old_el->values;
1929                 el->num_values = old_el->num_values;
1930                 talloc_steal(msg->elements, el->values);
1931         }
1932
1933         talloc_free(tmp_ctx);
1934
1935         /* we now tell the backend to replace all existing values
1936            with the one we have constructed */
1937         el->flags = LDB_FLAG_MOD_REPLACE;
1938
1939         return LDB_SUCCESS;
1940 }
1941
1942
1943 /*
1944   handle linked attributes in modify requests
1945  */
1946 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1947                                                struct ldb_message *msg,
1948                                                uint64_t seq_num, time_t t)
1949 {
1950         struct ldb_result *res;
1951         unsigned int i;
1952         int ret;
1953         struct ldb_context *ldb = ldb_module_get_ctx(module);
1954         struct ldb_message *old_msg;
1955
1956         const struct dsdb_schema *schema;
1957         struct GUID old_guid;
1958
1959         if (seq_num == 0) {
1960                 /* there the replmd_update_rpmd code has already
1961                  * checked and saw that there are no linked
1962                  * attributes */
1963                 return LDB_SUCCESS;
1964         }
1965
1966 #if !W2K3_LINKED_ATTRIBUTES
1967         return LDB_SUCCESS;
1968 #endif
1969
1970         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1971                 /* don't do anything special for linked attributes */
1972                 return LDB_SUCCESS;
1973         }
1974
1975         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1976                                     DSDB_SEARCH_SHOW_DELETED |
1977                                     DSDB_SEARCH_REVEAL_INTERNALS |
1978                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1979         if (ret != LDB_SUCCESS) {
1980                 return ret;
1981         }
1982         schema = dsdb_get_schema(ldb, res);
1983         if (!schema) {
1984                 return LDB_ERR_OPERATIONS_ERROR;
1985         }
1986
1987         old_msg = res->msgs[0];
1988
1989         old_guid = samdb_result_guid(old_msg, "objectGUID");
1990
1991         for (i=0; i<msg->num_elements; i++) {
1992                 struct ldb_message_element *el = &msg->elements[i];
1993                 struct ldb_message_element *old_el, *new_el;
1994                 const struct dsdb_attribute *schema_attr
1995                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1996                 if (!schema_attr) {
1997                         ldb_asprintf_errstring(ldb,
1998                                                "attribute %s is not a valid attribute in schema", el->name);
1999                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
2000                 }
2001                 if (schema_attr->linkID == 0) {
2002                         continue;
2003                 }
2004                 if ((schema_attr->linkID & 1) == 1) {
2005                         /* Odd is for the target.  Illegal to modify */
2006                         ldb_asprintf_errstring(ldb,
2007                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
2008                         return LDB_ERR_UNWILLING_TO_PERFORM;
2009                 }
2010                 old_el = ldb_msg_find_element(old_msg, el->name);
2011                 switch (el->flags & LDB_FLAG_MOD_MASK) {
2012                 case LDB_FLAG_MOD_REPLACE:
2013                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2014                         break;
2015                 case LDB_FLAG_MOD_DELETE:
2016                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2017                         break;
2018                 case LDB_FLAG_MOD_ADD:
2019                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2020                         break;
2021                 default:
2022                         ldb_asprintf_errstring(ldb,
2023                                                "invalid flags 0x%x for %s linked attribute",
2024                                                el->flags, el->name);
2025                         return LDB_ERR_UNWILLING_TO_PERFORM;
2026                 }
2027                 if (ret != LDB_SUCCESS) {
2028                         return ret;
2029                 }
2030                 if (old_el) {
2031                         ldb_msg_remove_attr(old_msg, el->name);
2032                 }
2033                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2034                 new_el->num_values = el->num_values;
2035                 new_el->values = talloc_steal(msg->elements, el->values);
2036
2037                 /* TODO: this relises a bit too heavily on the exact
2038                    behaviour of ldb_msg_find_element and
2039                    ldb_msg_remove_element */
2040                 old_el = ldb_msg_find_element(msg, el->name);
2041                 if (old_el != el) {
2042                         ldb_msg_remove_element(msg, old_el);
2043                         i--;
2044                 }
2045         }
2046
2047         talloc_free(res);
2048         return ret;
2049 }
2050
2051
2052
2053 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2054 {
2055         struct ldb_context *ldb;
2056         struct replmd_replicated_request *ac;
2057         struct ldb_request *down_req;
2058         struct ldb_message *msg;
2059         time_t t = time(NULL);
2060         int ret;
2061         bool is_urgent = false;
2062         struct loadparm_context *lp_ctx;
2063         char *referral;
2064
2065         /* do not manipulate our control entries */
2066         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2067                 return ldb_next_request(module, req);
2068         }
2069
2070         ldb = ldb_module_get_ctx(module);
2071         lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2072                                  struct loadparm_context);
2073
2074         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2075
2076         ac = replmd_ctx_init(module, req);
2077         if (!ac) {
2078                 return LDB_ERR_OPERATIONS_ERROR;
2079         }
2080
2081         /* we have to copy the message as the caller might have it as a const */
2082         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2083         if (msg == NULL) {
2084                 ldb_oom(ldb);
2085                 talloc_free(ac);
2086                 return LDB_ERR_OPERATIONS_ERROR;
2087         }
2088
2089         ldb_msg_remove_attr(msg, "whenChanged");
2090         ldb_msg_remove_attr(msg, "uSNChanged");
2091
2092         ret = replmd_update_rpmd(module, ac->schema, req, msg, &ac->seq_num, t, &is_urgent);
2093         if (ret == LDB_ERR_REFERRAL) {
2094                 talloc_free(ac);
2095
2096                 referral = talloc_asprintf(req,
2097                                            "ldap://%s/%s",
2098                                            lp_dnsdomain(lp_ctx),
2099                                            ldb_dn_get_linearized(msg->dn));
2100                 ret = ldb_module_send_referral(req, referral);
2101                 return ldb_module_done(req, NULL, NULL, ret);
2102         }
2103
2104         if (ret != LDB_SUCCESS) {
2105                 talloc_free(ac);
2106                 return ret;
2107         }
2108
2109         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
2110         if (ret != LDB_SUCCESS) {
2111                 talloc_free(ac);
2112                 return ret;
2113         }
2114
2115         /* TODO:
2116          * - replace the old object with the newly constructed one
2117          */
2118
2119         ac->is_urgent = is_urgent;
2120
2121         ret = ldb_build_mod_req(&down_req, ldb, ac,
2122                                 msg,
2123                                 req->controls,
2124                                 ac, replmd_op_callback,
2125                                 req);
2126         if (ret != LDB_SUCCESS) {
2127                 talloc_free(ac);
2128                 return ret;
2129         }
2130         talloc_steal(down_req, msg);
2131
2132         /* we only change whenChanged and uSNChanged if the seq_num
2133            has changed */
2134         if (ac->seq_num != 0) {
2135                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2136                         talloc_free(ac);
2137                         return ret;
2138                 }
2139
2140                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2141                         talloc_free(ac);
2142                         return ret;
2143                 }
2144         }
2145
2146         /* go on with the call chain */
2147         return ldb_next_request(module, down_req);
2148 }
2149
2150 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2151
2152 /*
2153   handle a rename request
2154
2155   On a rename we need to do an extra ldb_modify which sets the
2156   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2157  */
2158 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2159 {
2160         struct ldb_context *ldb;
2161         struct replmd_replicated_request *ac;
2162         int ret;
2163         struct ldb_request *down_req;
2164
2165         /* do not manipulate our control entries */
2166         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2167                 return ldb_next_request(module, req);
2168         }
2169
2170         ldb = ldb_module_get_ctx(module);
2171
2172         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2173
2174         ac = replmd_ctx_init(module, req);
2175         if (!ac) {
2176                 return LDB_ERR_OPERATIONS_ERROR;
2177         }
2178         ret = ldb_build_rename_req(&down_req, ldb, ac,
2179                                    ac->req->op.rename.olddn,
2180                                    ac->req->op.rename.newdn,
2181                                    ac->req->controls,
2182                                    ac, replmd_rename_callback,
2183                                    ac->req);
2184
2185         if (ret != LDB_SUCCESS) {
2186                 talloc_free(ac);
2187                 return ret;
2188         }
2189
2190         /* go on with the call chain */
2191         return ldb_next_request(module, down_req);
2192 }
2193
2194 /* After the rename is compleated, update the whenchanged etc */
2195 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2196 {
2197         struct ldb_context *ldb;
2198         struct replmd_replicated_request *ac;
2199         struct ldb_request *down_req;
2200         struct ldb_message *msg;
2201         time_t t = time(NULL);
2202         int ret;
2203
2204         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2205         ldb = ldb_module_get_ctx(ac->module);
2206
2207         if (ares->error != LDB_SUCCESS) {
2208                 return ldb_module_done(ac->req, ares->controls,
2209                                         ares->response, ares->error);
2210         }
2211
2212         if (ares->type != LDB_REPLY_DONE) {
2213                 ldb_set_errstring(ldb,
2214                                   "invalid ldb_reply_type in callback");
2215                 talloc_free(ares);
2216                 return ldb_module_done(ac->req, NULL, NULL,
2217                                         LDB_ERR_OPERATIONS_ERROR);
2218         }
2219
2220         /* Get a sequence number from the backend */
2221         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2222         if (ret != LDB_SUCCESS) {
2223                 return ret;
2224         }
2225
2226         /* TODO:
2227          * - replace the old object with the newly constructed one
2228          */
2229
2230         msg = ldb_msg_new(ac);
2231         if (msg == NULL) {
2232                 ldb_oom(ldb);
2233                 return LDB_ERR_OPERATIONS_ERROR;
2234         }
2235
2236         msg->dn = ac->req->op.rename.newdn;
2237
2238         ret = ldb_build_mod_req(&down_req, ldb, ac,
2239                                 msg,
2240                                 req->controls,
2241                                 ac, replmd_op_callback,
2242                                 req);
2243
2244         if (ret != LDB_SUCCESS) {
2245                 talloc_free(ac);
2246                 return ret;
2247         }
2248         talloc_steal(down_req, msg);
2249
2250         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2251                 talloc_free(ac);
2252                 return ret;
2253         }
2254
2255         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2256                 talloc_free(ac);
2257                 return ret;
2258         }
2259
2260         /* go on with the call chain - do the modify after the rename */
2261         return ldb_next_request(ac->module, down_req);
2262 }
2263
2264 /*
2265    remove links from objects that point at this object when an object
2266    is deleted
2267  */
2268 static int replmd_delete_remove_link(struct ldb_module *module,
2269                                      const struct dsdb_schema *schema,
2270                                      struct ldb_dn *dn,
2271                                      struct ldb_message_element *el,
2272                                      const struct dsdb_attribute *sa)
2273 {
2274         unsigned int i;
2275         TALLOC_CTX *tmp_ctx = talloc_new(module);
2276         struct ldb_context *ldb = ldb_module_get_ctx(module);
2277
2278         for (i=0; i<el->num_values; i++) {
2279                 struct dsdb_dn *dsdb_dn;
2280                 NTSTATUS status;
2281                 int ret;
2282                 struct GUID guid2;
2283                 struct ldb_message *msg;
2284                 const struct dsdb_attribute *target_attr;
2285                 struct ldb_message_element *el2;
2286                 struct ldb_val dn_val;
2287
2288                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2289                         continue;
2290                 }
2291
2292                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2293                 if (!dsdb_dn) {
2294                         talloc_free(tmp_ctx);
2295                         return LDB_ERR_OPERATIONS_ERROR;
2296                 }
2297
2298                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2299                 if (!NT_STATUS_IS_OK(status)) {
2300                         talloc_free(tmp_ctx);
2301                         return LDB_ERR_OPERATIONS_ERROR;
2302                 }
2303
2304                 /* remove the link */
2305                 msg = ldb_msg_new(tmp_ctx);
2306                 if (!msg) {
2307                         ldb_module_oom(module);
2308                         talloc_free(tmp_ctx);
2309                         return LDB_ERR_OPERATIONS_ERROR;
2310                 }
2311
2312
2313                 msg->dn = dsdb_dn->dn;
2314
2315                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2316                 if (target_attr == NULL) {
2317                         continue;
2318                 }
2319
2320                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2321                 if (ret != LDB_SUCCESS) {
2322                         ldb_module_oom(module);
2323                         talloc_free(tmp_ctx);
2324                         return LDB_ERR_OPERATIONS_ERROR;
2325                 }
2326                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2327                 el2->values = &dn_val;
2328                 el2->num_values = 1;
2329
2330                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2331                 if (ret != LDB_SUCCESS) {
2332                         talloc_free(tmp_ctx);
2333                         return ret;
2334                 }
2335         }
2336         talloc_free(tmp_ctx);
2337         return LDB_SUCCESS;
2338 }
2339
2340
2341 /*
2342   handle update of replication meta data for deletion of objects
2343
2344   This also handles the mapping of delete to a rename operation
2345   to allow deletes to be replicated.
2346  */
2347 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2348 {
2349         int ret = LDB_ERR_OTHER;
2350         bool retb;
2351         struct ldb_dn *old_dn, *new_dn;
2352         const char *rdn_name;
2353         const struct ldb_val *rdn_value, *new_rdn_value;
2354         struct GUID guid;
2355         struct ldb_context *ldb = ldb_module_get_ctx(module);
2356         const struct dsdb_schema *schema;
2357         struct ldb_message *msg, *old_msg;
2358         struct ldb_message_element *el;
2359         TALLOC_CTX *tmp_ctx;
2360         struct ldb_result *res, *parent_res;
2361         const char *preserved_attrs[] = {
2362                 /* yes, this really is a hard coded list. See MS-ADTS
2363                    section 3.1.1.5.5.1.1 */
2364                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2365                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2366                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2367                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2368                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2369                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2370                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2371                 "whenChanged", NULL};
2372         unsigned int i, el_count = 0;
2373         enum deletion_state { OBJECT_NOT_DELETED=1, OBJECT_DELETED=2, OBJECT_RECYCLED=3,
2374                                                 OBJECT_TOMBSTONE=4, OBJECT_REMOVED=5 };
2375         enum deletion_state deletion_state, next_deletion_state;
2376         bool enabled;
2377
2378         if (ldb_dn_is_special(req->op.del.dn)) {
2379                 return ldb_next_request(module, req);
2380         }
2381
2382         tmp_ctx = talloc_new(ldb);
2383         if (!tmp_ctx) {
2384                 ldb_oom(ldb);
2385                 return LDB_ERR_OPERATIONS_ERROR;
2386         }
2387
2388         schema = dsdb_get_schema(ldb, tmp_ctx);
2389         if (!schema) {
2390                 return LDB_ERR_OPERATIONS_ERROR;
2391         }
2392
2393         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2394
2395         /* we need the complete msg off disk, so we can work out which
2396            attributes need to be removed */
2397         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2398                                     DSDB_SEARCH_SHOW_DELETED |
2399                                     DSDB_SEARCH_REVEAL_INTERNALS |
2400                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2401         if (ret != LDB_SUCCESS) {
2402                 talloc_free(tmp_ctx);
2403                 return ret;
2404         }
2405         old_msg = res->msgs[0];
2406
2407
2408         ret = dsdb_recyclebin_enabled(module, &enabled);
2409         if (ret != LDB_SUCCESS) {
2410                 talloc_free(tmp_ctx);
2411                 return ret;
2412         }
2413
2414         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2415                 if (!enabled) {
2416                         deletion_state = OBJECT_TOMBSTONE;
2417                         next_deletion_state = OBJECT_REMOVED;
2418                 } else if (ldb_msg_check_string_attribute(old_msg, "isRecycled", "TRUE")) {
2419                         deletion_state = OBJECT_RECYCLED;
2420                         next_deletion_state = OBJECT_REMOVED;
2421                 } else {
2422                         deletion_state = OBJECT_DELETED;
2423                         next_deletion_state = OBJECT_RECYCLED;
2424                 }
2425         } else {
2426                 deletion_state = OBJECT_NOT_DELETED;
2427                 if (enabled) {
2428                         next_deletion_state = OBJECT_DELETED;
2429                 } else {
2430                         next_deletion_state = OBJECT_TOMBSTONE;
2431                 }
2432         }
2433
2434         if (next_deletion_state == OBJECT_REMOVED) {
2435                 struct auth_session_info *session_info =
2436                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2437                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2438                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2439                                         ldb_dn_get_linearized(old_msg->dn));
2440                         return LDB_ERR_UNWILLING_TO_PERFORM;
2441                 }
2442
2443                 /* it is already deleted - really remove it this time */
2444                 talloc_free(tmp_ctx);
2445                 return ldb_next_request(module, req);
2446         }
2447
2448         rdn_name = ldb_dn_get_rdn_name(old_dn);
2449         rdn_value = ldb_dn_get_rdn_val(old_dn);
2450
2451         msg = ldb_msg_new(tmp_ctx);
2452         if (msg == NULL) {
2453                 ldb_module_oom(module);
2454                 talloc_free(tmp_ctx);
2455                 return LDB_ERR_OPERATIONS_ERROR;
2456         }
2457
2458         msg->dn = old_dn;
2459
2460         if (deletion_state == OBJECT_NOT_DELETED){
2461                 /* work out where we will be renaming this object to */
2462                 ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2463                 if (ret != LDB_SUCCESS) {
2464                         /* this is probably an attempted delete on a partition
2465                          * that doesn't allow delete operations, such as the
2466                          * schema partition */
2467                         ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2468                                                    ldb_dn_get_linearized(old_dn));
2469                         talloc_free(tmp_ctx);
2470                         return LDB_ERR_UNWILLING_TO_PERFORM;
2471                 }
2472
2473                 /* get the objects GUID from the search we just did */
2474                 guid = samdb_result_guid(old_msg, "objectGUID");
2475
2476                 /* Add a formatted child */
2477                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2478                                                 rdn_name,
2479                                                 rdn_value->data,
2480                                                 GUID_string(tmp_ctx, &guid));
2481                 if (!retb) {
2482                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2483                                         ldb_dn_get_linearized(new_dn)));
2484                         talloc_free(tmp_ctx);
2485                         return LDB_ERR_OPERATIONS_ERROR;
2486                 }
2487
2488                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2489                 if (ret != LDB_SUCCESS) {
2490                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2491                         ldb_module_oom(module);
2492                         talloc_free(tmp_ctx);
2493                         return ret;
2494                 }
2495                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2496         }
2497
2498         /*
2499           now we need to modify the object in the following ways:
2500
2501           - add isDeleted=TRUE
2502           - update rDN and name, with new rDN
2503           - remove linked attributes
2504           - remove objectCategory and sAMAccountType
2505           - remove attribs not on the preserved list
2506              - preserved if in above list, or is rDN
2507           - remove all linked attribs from this object
2508           - remove all links from other objects to this object
2509           - add lastKnownParent
2510           - update replPropertyMetaData?
2511
2512           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2513          */
2514
2515         /* we need the storage form of the parent GUID */
2516         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2517                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2518                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2519                                     DSDB_SEARCH_REVEAL_INTERNALS|
2520                                     DSDB_SEARCH_SHOW_DELETED);
2521         if (ret != LDB_SUCCESS) {
2522                 talloc_free(tmp_ctx);
2523                 return ret;
2524         }
2525
2526         if (deletion_state == OBJECT_NOT_DELETED){
2527                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2528                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2529                 if (ret != LDB_SUCCESS) {
2530                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2531                         ldb_module_oom(module);
2532                         talloc_free(tmp_ctx);
2533                         return ret;
2534                 }
2535                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2536         }
2537
2538         switch (next_deletion_state){
2539
2540         case OBJECT_DELETED:
2541
2542                 ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
2543                 if (ret != LDB_SUCCESS) {
2544                         DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
2545                         ldb_module_oom(module);
2546                         talloc_free(tmp_ctx);
2547                         return ret;
2548                 }
2549                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2550
2551                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_DELETE, NULL);
2552                 if (ret != LDB_SUCCESS) {
2553                         talloc_free(tmp_ctx);
2554                         ldb_module_oom(module);
2555                         return ret;
2556                 }
2557
2558                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_DELETE, NULL);
2559                 if (ret != LDB_SUCCESS) {
2560                         talloc_free(tmp_ctx);
2561                         ldb_module_oom(module);
2562                         return ret;
2563                 }
2564
2565                 break;
2566
2567         case OBJECT_RECYCLED:
2568         case OBJECT_TOMBSTONE:
2569
2570                 /* we also mark it as recycled, meaning this object can't be
2571                    recovered (we are stripping its attributes) */
2572                 if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2573                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2574                         if (ret != LDB_SUCCESS) {
2575                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2576                                 ldb_module_oom(module);
2577                                 talloc_free(tmp_ctx);
2578                                 return ret;
2579                         }
2580                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2581                 }
2582
2583                 /* work out which of the old attributes we will be removing */
2584                 for (i=0; i<old_msg->num_elements; i++) {
2585                         const struct dsdb_attribute *sa;
2586                         el = &old_msg->elements[i];
2587                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2588                         if (!sa) {
2589                                 talloc_free(tmp_ctx);
2590                                 return LDB_ERR_OPERATIONS_ERROR;
2591                         }
2592                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2593                                 /* don't remove the rDN */
2594                                 continue;
2595                         }
2596                         if (sa->linkID && sa->linkID & 1) {
2597                         ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2598                                 if (ret != LDB_SUCCESS) {
2599                                         talloc_free(tmp_ctx);
2600                                         return LDB_ERR_OPERATIONS_ERROR;
2601                                 }
2602                                 continue;
2603                         }
2604                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2605                                 continue;
2606                         }
2607                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2608                         if (ret != LDB_SUCCESS) {
2609                                 talloc_free(tmp_ctx);
2610                                 ldb_module_oom(module);
2611                                 return ret;
2612                         }
2613                 }
2614                 break;
2615
2616         default:
2617                 break;
2618         }
2619
2620         if (deletion_state == OBJECT_NOT_DELETED) {
2621                 /* work out what the new rdn value is, for updating the
2622                    rDN and name fields */
2623                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2624
2625                 ret = ldb_msg_add_value(msg, strlower_talloc(tmp_ctx, rdn_name), new_rdn_value, &el);
2626                 if (ret != LDB_SUCCESS) {
2627                         talloc_free(tmp_ctx);
2628                         return ret;
2629                 }
2630                 el->flags = LDB_FLAG_MOD_REPLACE;
2631
2632                 el = ldb_msg_find_element(old_msg, "name");
2633                 if (el) {
2634                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2635                         if (ret != LDB_SUCCESS) {
2636                                 talloc_free(tmp_ctx);
2637                                 return ret;
2638                         }
2639                         el->flags = LDB_FLAG_MOD_REPLACE;
2640                 }
2641         }
2642
2643         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2644         if (ret != LDB_SUCCESS) {
2645                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2646                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2647                 talloc_free(tmp_ctx);
2648                 return ret;
2649         }
2650
2651         if (deletion_state == OBJECT_NOT_DELETED) {
2652                 /* now rename onto the new DN */
2653                 ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2654                 if (ret != LDB_SUCCESS){
2655                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2656                                  ldb_dn_get_linearized(old_dn),
2657                                  ldb_dn_get_linearized(new_dn),
2658                                  ldb_errstring(ldb)));
2659                         talloc_free(tmp_ctx);
2660                         return ret;
2661                 }
2662         }
2663
2664         talloc_free(tmp_ctx);
2665
2666         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2667 }
2668
2669
2670
2671 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2672 {
2673         return ret;
2674 }
2675
2676 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2677 {
2678         int ret = LDB_ERR_OTHER;
2679         /* TODO: do some error mapping */
2680         return ret;
2681 }
2682
2683 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2684 {
2685         struct ldb_context *ldb;
2686         struct ldb_request *change_req;
2687         enum ndr_err_code ndr_err;
2688         struct ldb_message *msg;
2689         struct replPropertyMetaDataBlob *md;
2690         struct ldb_val md_value;
2691         unsigned int i;
2692         int ret;
2693
2694         /*
2695          * TODO: check if the parent object exist
2696          */
2697
2698         /*
2699          * TODO: handle the conflict case where an object with the
2700          *       same name exist
2701          */
2702
2703         ldb = ldb_module_get_ctx(ar->module);
2704         msg = ar->objs->objects[ar->index_current].msg;
2705         md = ar->objs->objects[ar->index_current].meta_data;
2706
2707         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2708         if (ret != LDB_SUCCESS) {
2709                 return replmd_replicated_request_error(ar, ret);
2710         }
2711
2712         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2713         if (ret != LDB_SUCCESS) {
2714                 return replmd_replicated_request_error(ar, ret);
2715         }
2716
2717         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2718         if (ret != LDB_SUCCESS) {
2719                 return replmd_replicated_request_error(ar, ret);
2720         }
2721
2722         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2723         if (ret != LDB_SUCCESS) {
2724                 return replmd_replicated_request_error(ar, ret);
2725         }
2726
2727         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2728         if (ret != LDB_SUCCESS) {
2729                 return replmd_replicated_request_error(ar, ret);
2730         }
2731
2732         /* remove any message elements that have zero values */
2733         for (i=0; i<msg->num_elements; i++) {
2734                 struct ldb_message_element *el = &msg->elements[i];
2735
2736                 if (el->num_values == 0) {
2737                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2738                                  el->name));
2739                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2740                         msg->num_elements--;
2741                         i--;
2742                         continue;
2743                 }
2744         }
2745
2746         /*
2747          * the meta data array is already sorted by the caller
2748          */
2749         for (i=0; i < md->ctr.ctr1.count; i++) {
2750                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2751         }
2752         ndr_err = ndr_push_struct_blob(&md_value, msg,
2753                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2754                                        md,
2755                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2756         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2757                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2758                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2759         }
2760         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2761         if (ret != LDB_SUCCESS) {
2762                 return replmd_replicated_request_error(ar, ret);
2763         }
2764
2765         replmd_ldb_message_sort(msg, ar->schema);
2766
2767         if (DEBUGLVL(4)) {
2768                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2769                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2770                 talloc_free(s);
2771         }
2772
2773         ret = ldb_build_add_req(&change_req,
2774                                 ldb,
2775                                 ar,
2776                                 msg,
2777                                 ar->controls,
2778                                 ar,
2779                                 replmd_op_callback,
2780                                 ar->req);
2781         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2782
2783         return ldb_next_request(ar->module, change_req);
2784 }
2785
2786 /*
2787    return true if an update is newer than an existing entry
2788    see section 5.11 of MS-ADTS
2789 */
2790 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2791                                    const struct GUID *update_invocation_id,
2792                                    uint32_t current_version,
2793                                    uint32_t update_version,
2794                                    NTTIME current_change_time,
2795                                    NTTIME update_change_time)
2796 {
2797         if (update_version != current_version) {
2798                 return update_version > current_version;
2799         }
2800         if (update_change_time > current_change_time) {
2801                 return true;
2802         }
2803         if (update_change_time == current_change_time) {
2804                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2805         }
2806         return false;
2807 }
2808
2809 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2810                                                   struct replPropertyMetaData1 *new_m)
2811 {
2812         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2813                                       &new_m->originating_invocation_id,
2814                                       cur_m->version,
2815                                       new_m->version,
2816                                       cur_m->originating_change_time,
2817                                       new_m->originating_change_time);
2818 }
2819
2820 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2821 {
2822         struct ldb_context *ldb;
2823         struct ldb_request *change_req;
2824         enum ndr_err_code ndr_err;
2825         struct ldb_message *msg;
2826         struct replPropertyMetaDataBlob *rmd;
2827         struct replPropertyMetaDataBlob omd;
2828         const struct ldb_val *omd_value;
2829         struct replPropertyMetaDataBlob nmd;
2830         struct ldb_val nmd_value;
2831         unsigned int i;
2832         uint32_t j,ni=0;
2833         unsigned int removed_attrs = 0;
2834         int ret;
2835
2836         ldb = ldb_module_get_ctx(ar->module);
2837         msg = ar->objs->objects[ar->index_current].msg;
2838         rmd = ar->objs->objects[ar->index_current].meta_data;
2839         ZERO_STRUCT(omd);
2840         omd.version = 1;
2841
2842         /*
2843          * TODO: check repl data is correct after a rename
2844          */
2845         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2846                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2847                           ldb_dn_get_linearized(ar->search_msg->dn),
2848                           ldb_dn_get_linearized(msg->dn));
2849                 if (dsdb_module_rename(ar->module,
2850                                        ar->search_msg->dn, msg->dn,
2851                                        DSDB_FLAG_OWN_MODULE) != LDB_SUCCESS) {
2852                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2853                                   ldb_dn_get_linearized(ar->search_msg->dn),
2854                                   ldb_dn_get_linearized(msg->dn),
2855                                   ldb_errstring(ldb));
2856                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2857                 }
2858         }
2859
2860         /* find existing meta data */
2861         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2862         if (omd_value) {
2863                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
2864                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
2865                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2866                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2867                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2868                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2869                 }
2870
2871                 if (omd.version != 1) {
2872                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2873                 }
2874         }
2875
2876         ZERO_STRUCT(nmd);
2877         nmd.version = 1;
2878         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2879         nmd.ctr.ctr1.array = talloc_array(ar,
2880                                           struct replPropertyMetaData1,
2881                                           nmd.ctr.ctr1.count);
2882         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2883
2884         /* first copy the old meta data */
2885         for (i=0; i < omd.ctr.ctr1.count; i++) {
2886                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2887                 ni++;
2888         }
2889
2890         /* now merge in the new meta data */
2891         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2892                 bool found = false;
2893
2894                 for (j=0; j < ni; j++) {
2895                         bool cmp;
2896
2897                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2898                                 continue;
2899                         }
2900
2901                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2902                                                                     &rmd->ctr.ctr1.array[i]);
2903                         if (cmp) {
2904                                 /* replace the entry */
2905                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2906                                 found = true;
2907                                 break;
2908                         }
2909
2910                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
2911                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
2912                                          msg->elements[i-removed_attrs].name,
2913                                          ldb_dn_get_linearized(msg->dn),
2914                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2915                         }
2916
2917                         /* we don't want to apply this change so remove the attribute */
2918                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2919                         removed_attrs++;
2920
2921                         found = true;
2922                         break;
2923                 }
2924
2925                 if (found) continue;
2926
2927                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2928                 ni++;
2929         }
2930
2931         /*
2932          * finally correct the size of the meta_data array
2933          */
2934         nmd.ctr.ctr1.count = ni;
2935
2936         /*
2937          * the rdn attribute (the alias for the name attribute),
2938          * 'cn' for most objects is the last entry in the meta data array
2939          * we have stored
2940          *
2941          * sort the new meta data array
2942          */
2943         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2944         if (ret != LDB_SUCCESS) {
2945                 return ret;
2946         }
2947
2948         /*
2949          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2950          */
2951         if (msg->num_elements == 0) {
2952                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2953                           ar->index_current);
2954
2955                 ar->index_current++;
2956                 return replmd_replicated_apply_next(ar);
2957         }
2958
2959         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2960                   ar->index_current, msg->num_elements);
2961
2962         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2963         if (ret != LDB_SUCCESS) {
2964                 return replmd_replicated_request_error(ar, ret);
2965         }
2966
2967         for (i=0; i<ni; i++) {
2968                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2969         }
2970
2971         /* create the meta data value */
2972         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
2973                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2974                                        &nmd,
2975                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2976         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2977                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2978                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2979         }
2980
2981         /*
2982          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2983          * and replPopertyMetaData attributes
2984          */
2985         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2986         if (ret != LDB_SUCCESS) {
2987                 return replmd_replicated_request_error(ar, ret);
2988         }
2989         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2990         if (ret != LDB_SUCCESS) {
2991                 return replmd_replicated_request_error(ar, ret);
2992         }
2993         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2994         if (ret != LDB_SUCCESS) {
2995                 return replmd_replicated_request_error(ar, ret);
2996         }
2997
2998         replmd_ldb_message_sort(msg, ar->schema);
2999
3000         /* we want to replace the old values */
3001         for (i=0; i < msg->num_elements; i++) {
3002                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
3003         }
3004
3005         if (DEBUGLVL(4)) {
3006                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3007                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
3008                 talloc_free(s);
3009         }
3010
3011         ret = ldb_build_mod_req(&change_req,
3012                                 ldb,
3013                                 ar,
3014                                 msg,
3015                                 ar->controls,
3016                                 ar,
3017                                 replmd_op_callback,
3018                                 ar->req);
3019         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3020
3021         return ldb_next_request(ar->module, change_req);
3022 }
3023
3024 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
3025                                                    struct ldb_reply *ares)
3026 {
3027         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3028                                                struct replmd_replicated_request);
3029         int ret;
3030
3031         if (!ares) {
3032                 return ldb_module_done(ar->req, NULL, NULL,
3033                                         LDB_ERR_OPERATIONS_ERROR);
3034         }
3035         if (ares->error != LDB_SUCCESS &&
3036             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3037                 return ldb_module_done(ar->req, ares->controls,
3038                                         ares->response, ares->error);
3039         }
3040
3041         switch (ares->type) {
3042         case LDB_REPLY_ENTRY:
3043                 ar->search_msg = talloc_steal(ar, ares->message);
3044                 break;
3045
3046         case LDB_REPLY_REFERRAL:
3047                 /* we ignore referrals */
3048                 break;
3049
3050         case LDB_REPLY_DONE:
3051                 if (ar->search_msg != NULL) {
3052                         ret = replmd_replicated_apply_merge(ar);
3053                 } else {
3054                         ret = replmd_replicated_apply_add(ar);
3055                 }
3056                 if (ret != LDB_SUCCESS) {
3057                         return ldb_module_done(ar->req, NULL, NULL, ret);
3058                 }
3059         }
3060
3061         talloc_free(ares);
3062         return LDB_SUCCESS;
3063 }
3064
3065 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
3066
3067 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
3068 {
3069         struct ldb_context *ldb;
3070         int ret;
3071         char *tmp_str;
3072         char *filter;
3073         struct ldb_request *search_req;
3074         struct ldb_search_options_control *options;
3075
3076         if (ar->index_current >= ar->objs->num_objects) {
3077                 /* done with it, go to next stage */
3078                 return replmd_replicated_uptodate_vector(ar);
3079         }
3080
3081         ldb = ldb_module_get_ctx(ar->module);
3082         ar->search_msg = NULL;
3083
3084         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
3085         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3086
3087         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
3088         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3089         talloc_free(tmp_str);
3090
3091         ret = ldb_build_search_req(&search_req,
3092                                    ldb,
3093                                    ar,
3094                                    NULL,
3095                                    LDB_SCOPE_SUBTREE,
3096                                    filter,
3097                                    NULL,
3098                                    NULL,
3099                                    ar,
3100                                    replmd_replicated_apply_search_callback,
3101                                    ar->req);
3102
3103         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
3104         if (ret != LDB_SUCCESS) {
3105                 return ret;
3106         }
3107
3108         /* we need to cope with cross-partition links, so search for
3109            the GUID over all partitions */
3110         options = talloc(search_req, struct ldb_search_options_control);
3111         if (options == NULL) {
3112                 DEBUG(0, (__location__ ": out of memory\n"));
3113                 return LDB_ERR_OPERATIONS_ERROR;
3114         }
3115         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
3116
3117         ret = ldb_request_add_control(search_req,
3118                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
3119                                       true, options);
3120         if (ret != LDB_SUCCESS) {
3121                 return ret;
3122         }
3123
3124         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3125
3126         return ldb_next_request(ar->module, search_req);
3127 }
3128
3129 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
3130                                                       struct ldb_reply *ares)
3131 {
3132         struct ldb_context *ldb;
3133         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3134                                                struct replmd_replicated_request);
3135         ldb = ldb_module_get_ctx(ar->module);
3136
3137         if (!ares) {
3138                 return ldb_module_done(ar->req, NULL, NULL,
3139                                         LDB_ERR_OPERATIONS_ERROR);
3140         }
3141         if (ares->error != LDB_SUCCESS) {
3142                 return ldb_module_done(ar->req, ares->controls,
3143                                         ares->response, ares->error);
3144         }
3145
3146         if (ares->type != LDB_REPLY_DONE) {
3147                 ldb_set_errstring(ldb, "Invalid reply type\n!");
3148                 return ldb_module_done(ar->req, NULL, NULL,
3149                                         LDB_ERR_OPERATIONS_ERROR);
3150         }
3151
3152         talloc_free(ares);
3153
3154         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3155 }
3156
3157 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3158 {
3159         struct ldb_context *ldb;
3160         struct ldb_request *change_req;
3161         enum ndr_err_code ndr_err;
3162         struct ldb_message *msg;
3163         struct replUpToDateVectorBlob ouv;
3164         const struct ldb_val *ouv_value;
3165         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3166         struct replUpToDateVectorBlob nuv;
3167         struct ldb_val nuv_value;
3168         struct ldb_message_element *nuv_el = NULL;
3169         const struct GUID *our_invocation_id;
3170         struct ldb_message_element *orf_el = NULL;
3171         struct repsFromToBlob nrf;
3172         struct ldb_val *nrf_value = NULL;
3173         struct ldb_message_element *nrf_el = NULL;
3174         unsigned int i;
3175         uint32_t j,ni=0;
3176         bool found = false;
3177         time_t t = time(NULL);
3178         NTTIME now;
3179         int ret;
3180
3181         ldb = ldb_module_get_ctx(ar->module);
3182         ruv = ar->objs->uptodateness_vector;
3183         ZERO_STRUCT(ouv);
3184         ouv.version = 2;
3185         ZERO_STRUCT(nuv);
3186         nuv.version = 2;
3187
3188         unix_to_nt_time(&now, t);
3189
3190         /*
3191          * first create the new replUpToDateVector
3192          */
3193         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3194         if (ouv_value) {
3195                 ndr_err = ndr_pull_struct_blob(ouv_value, ar,
3196                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
3197                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3198                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3199                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3200                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3201                 }
3202
3203                 if (ouv.version != 2) {
3204                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3205                 }
3206         }
3207
3208         /*
3209          * the new uptodateness vector will at least
3210          * contain 1 entry, one for the source_dsa
3211          *
3212          * plus optional values from our old vector and the one from the source_dsa
3213          */
3214         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3215         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3216         nuv.ctr.ctr2.cursors = talloc_array(ar,
3217                                             struct drsuapi_DsReplicaCursor2,
3218                                             nuv.ctr.ctr2.count);
3219         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3220
3221         /* first copy the old vector */
3222         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3223                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3224                 ni++;
3225         }
3226
3227         /* get our invocation_id if we have one already attached to the ldb */
3228         our_invocation_id = samdb_ntds_invocation_id(ldb);
3229
3230         /* merge in the source_dsa vector is available */
3231         for (i=0; (ruv && i < ruv->count); i++) {
3232                 found = false;
3233
3234                 if (our_invocation_id &&
3235                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3236                                our_invocation_id)) {
3237                         continue;
3238                 }
3239
3240                 for (j=0; j < ni; j++) {
3241                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3242                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3243                                 continue;
3244                         }
3245
3246                         found = true;
3247
3248                         /*
3249                          * we update only the highest_usn and not the latest_sync_success time,
3250                          * because the last success stands for direct replication
3251                          */
3252                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3253                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3254                         }
3255                         break;
3256                 }
3257
3258                 if (found) continue;
3259
3260                 /* if it's not there yet, add it */
3261                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3262                 ni++;
3263         }
3264
3265         /*
3266          * merge in the current highwatermark for the source_dsa
3267          */
3268         found = false;
3269         for (j=0; j < ni; j++) {
3270                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3271                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3272                         continue;
3273                 }
3274
3275                 found = true;
3276
3277                 /*
3278                  * here we update the highest_usn and last_sync_success time
3279                  * because we're directly replicating from the source_dsa
3280                  *
3281                  * and use the tmp_highest_usn because this is what we have just applied
3282                  * to our ldb
3283                  */
3284                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3285                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3286                 break;
3287         }
3288         if (!found) {
3289                 /*
3290                  * here we update the highest_usn and last_sync_success time
3291                  * because we're directly replicating from the source_dsa
3292                  *
3293                  * and use the tmp_highest_usn because this is what we have just applied
3294                  * to our ldb
3295                  */
3296                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3297                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3298                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3299                 ni++;
3300         }
3301
3302         /*
3303          * finally correct the size of the cursors array
3304          */
3305         nuv.ctr.ctr2.count = ni;
3306
3307         /*
3308          * sort the cursors
3309          */
3310         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
3311
3312         /*
3313          * create the change ldb_message
3314          */
3315         msg = ldb_msg_new(ar);
3316         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3317         msg->dn = ar->search_msg->dn;
3318
3319         ndr_err = ndr_push_struct_blob(&nuv_value, msg,
3320                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3321                                        &nuv,
3322                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3323         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3324                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3325                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3326         }
3327         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3328         if (ret != LDB_SUCCESS) {
3329                 return replmd_replicated_request_error(ar, ret);
3330         }
3331         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3332
3333         /*
3334          * now create the new repsFrom value from the given repsFromTo1 structure
3335          */
3336         ZERO_STRUCT(nrf);
3337         nrf.version                                     = 1;
3338         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3339         /* and fix some values... */
3340         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3341         nrf.ctr.ctr1.last_success                       = now;
3342         nrf.ctr.ctr1.last_attempt                       = now;
3343         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3344         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3345
3346         /*
3347          * first see if we already have a repsFrom value for the current source dsa
3348          * if so we'll later replace this value
3349          */
3350         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3351         if (orf_el) {
3352                 for (i=0; i < orf_el->num_values; i++) {
3353                         struct repsFromToBlob *trf;
3354
3355                         trf = talloc(ar, struct repsFromToBlob);
3356                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3357
3358                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
3359                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3360                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3361                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3362                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3363                         }
3364
3365                         if (trf->version != 1) {
3366                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3367                         }
3368
3369                         /*
3370                          * we compare the source dsa objectGUID not the invocation_id
3371                          * because we want only one repsFrom value per source dsa
3372                          * and when the invocation_id of the source dsa has changed we don't need
3373                          * the old repsFrom with the old invocation_id
3374                          */
3375                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3376                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3377                                 talloc_free(trf);
3378                                 continue;
3379                         }
3380
3381                         talloc_free(trf);
3382                         nrf_value = &orf_el->values[i];
3383                         break;
3384                 }
3385
3386                 /*
3387                  * copy over all old values to the new ldb_message
3388                  */
3389                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3390                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3391                 *nrf_el = *orf_el;
3392         }
3393
3394         /*
3395          * if we haven't found an old repsFrom value for the current source dsa
3396          * we'll add a new value
3397          */
3398         if (!nrf_value) {
3399                 struct ldb_val zero_value;
3400                 ZERO_STRUCT(zero_value);
3401                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3402                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3403
3404                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3405         }
3406
3407         /* we now fill the value which is already attached to ldb_message */
3408         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3409                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3410                                        &nrf,
3411                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3412         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3413                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3414                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3415         }
3416
3417         /*
3418          * the ldb_message_element for the attribute, has all the old values and the new one
3419          * so we'll replace the whole attribute with all values
3420          */
3421         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3422
3423         if (DEBUGLVL(4)) {
3424                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3425                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3426                 talloc_free(s);
3427         }
3428
3429         /* prepare the ldb_modify() request */
3430         ret = ldb_build_mod_req(&change_req,
3431                                 ldb,
3432                                 ar,
3433                                 msg,
3434                                 ar->controls,
3435                                 ar,
3436                                 replmd_replicated_uptodate_modify_callback,
3437                                 ar->req);
3438         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3439
3440         return ldb_next_request(ar->module, change_req);
3441 }
3442
3443 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3444                                                       struct ldb_reply *ares)
3445 {
3446         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3447                                                struct replmd_replicated_request);
3448         int ret;
3449
3450         if (!ares) {
3451                 return ldb_module_done(ar->req, NULL, NULL,
3452                                         LDB_ERR_OPERATIONS_ERROR);
3453         }
3454         if (ares->error != LDB_SUCCESS &&
3455             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3456                 return ldb_module_done(ar->req, ares->controls,
3457                                         ares->response, ares->error);
3458         }
3459
3460         switch (ares->type) {
3461         case LDB_REPLY_ENTRY:
3462                 ar->search_msg = talloc_steal(ar, ares->message);
3463                 break;
3464
3465         case LDB_REPLY_REFERRAL:
3466                 /* we ignore referrals */
3467                 break;
3468
3469         case LDB_REPLY_DONE:
3470                 if (ar->search_msg == NULL) {
3471                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3472                 } else {
3473                         ret = replmd_replicated_uptodate_modify(ar);
3474                 }
3475                 if (ret != LDB_SUCCESS) {
3476                         return ldb_module_done(ar->req, NULL, NULL, ret);
3477                 }
3478         }
3479
3480         talloc_free(ares);
3481         return LDB_SUCCESS;
3482 }
3483
3484
3485 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3486 {
3487         struct ldb_context *ldb;
3488         int ret;
3489         static const char *attrs[] = {
3490                 "replUpToDateVector",
3491                 "repsFrom",
3492                 NULL
3493         };
3494         struct ldb_request *search_req;
3495
3496         ldb = ldb_module_get_ctx(ar->module);
3497         ar->search_msg = NULL;
3498
3499         ret = ldb_build_search_req(&search_req,
3500                                    ldb,
3501                                    ar,
3502                                    ar->objs->partition_dn,
3503                                    LDB_SCOPE_BASE,
3504                                    "(objectClass=*)",
3505                                    attrs,
3506                                    NULL,
3507                                    ar,
3508                                    replmd_replicated_uptodate_search_callback,
3509                                    ar->req);
3510         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3511
3512         return ldb_next_request(ar->module, search_req);
3513 }
3514
3515
3516
3517 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3518 {
3519         struct ldb_context *ldb;
3520         struct dsdb_extended_replicated_objects *objs;
3521         struct replmd_replicated_request *ar;
3522         struct ldb_control **ctrls;
3523         int ret;
3524         uint32_t i;
3525         struct replmd_private *replmd_private =
3526                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3527
3528         ldb = ldb_module_get_ctx(module);
3529
3530         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3531
3532         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3533         if (!objs) {
3534                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3535                 return LDB_ERR_PROTOCOL_ERROR;
3536         }
3537
3538         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3539                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3540                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3541                 return LDB_ERR_PROTOCOL_ERROR;
3542         }
3543
3544         ar = replmd_ctx_init(module, req);
3545         if (!ar)
3546                 return LDB_ERR_OPERATIONS_ERROR;
3547
3548         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3549         ar->apply_mode = true;
3550         ar->objs = objs;
3551         ar->schema = dsdb_get_schema(ldb, ar);
3552         if (!ar->schema) {
3553                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3554                 talloc_free(ar);
3555                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3556                 return LDB_ERR_CONSTRAINT_VIOLATION;
3557         }
3558
3559         ctrls = req->controls;
3560
3561         if (req->controls) {
3562                 req->controls = talloc_memdup(ar, req->controls,
3563                                               talloc_get_size(req->controls));
3564                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3565         }
3566
3567         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3568         if (ret != LDB_SUCCESS) {
3569                 return ret;
3570         }
3571
3572         ar->controls = req->controls;
3573         req->controls = ctrls;
3574
3575         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3576
3577         /* save away the linked attributes for the end of the
3578            transaction */
3579         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3580                 struct la_entry *la_entry;
3581
3582                 if (replmd_private->la_ctx == NULL) {
3583                         replmd_private->la_ctx = talloc_new(replmd_private);
3584                 }
3585                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3586                 if (la_entry == NULL) {
3587                         ldb_oom(ldb);
3588                         return LDB_ERR_OPERATIONS_ERROR;
3589                 }
3590                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3591                 if (la_entry->la == NULL) {
3592                         talloc_free(la_entry);
3593                         ldb_oom(ldb);
3594                         return LDB_ERR_OPERATIONS_ERROR;
3595                 }
3596                 *la_entry->la = ar->objs->linked_attributes[i];
3597
3598                 /* we need to steal the non-scalars so they stay
3599                    around until the end of the transaction */
3600                 talloc_steal(la_entry->la, la_entry->la->identifier);
3601                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3602
3603                 DLIST_ADD(replmd_private->la_list, la_entry);
3604         }
3605
3606         return replmd_replicated_apply_next(ar);
3607 }
3608
3609 /*
3610   process one linked attribute structure
3611  */
3612 static int replmd_process_linked_attribute(struct ldb_module *module,
3613                                            struct la_entry *la_entry)
3614 {
3615         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3616         struct ldb_context *ldb = ldb_module_get_ctx(module);
3617         struct ldb_message *msg;
3618         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3619         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
3620         int ret;
3621         const struct dsdb_attribute *attr;
3622         struct dsdb_dn *dsdb_dn;
3623         uint64_t seq_num = 0;
3624         struct ldb_message_element *old_el;
3625         WERROR status;
3626         time_t t = time(NULL);
3627         struct ldb_result *res;
3628         const char *attrs[2];
3629         struct parsed_dn *pdn_list, *pdn;
3630         struct GUID guid = GUID_zero();
3631         NTSTATUS ntstatus;
3632         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3633         const struct GUID *our_invocation_id;
3634
3635 /*
3636 linked_attributes[0]:
3637      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3638         identifier               : *
3639             identifier: struct drsuapi_DsReplicaObjectIdentifier
3640                 __ndr_size               : 0x0000003a (58)
3641                 __ndr_size_sid           : 0x00000000 (0)
3642                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3643                 sid                      : S-0-0
3644                 __ndr_size_dn            : 0x00000000 (0)
3645                 dn                       : ''
3646         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3647         value: struct drsuapi_DsAttributeValue
3648             __ndr_size               : 0x0000007e (126)
3649             blob                     : *
3650                 blob                     : DATA_BLOB length=126
3651         flags                    : 0x00000001 (1)
3652                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3653         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3654         meta_data: struct drsuapi_DsReplicaMetaData
3655             version                  : 0x00000015 (21)
3656             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3657             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3658             originating_usn          : 0x000000000001e19c (123292)
3659
3660 (for cases where the link is to a normal DN)
3661      &target: struct drsuapi_DsReplicaObjectIdentifier3
3662         __ndr_size               : 0x0000007e (126)
3663         __ndr_size_sid           : 0x0000001c (28)
3664         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3665         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3666         __ndr_size_dn            : 0x00000022 (34)
3667         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3668  */
3669
3670         /* find the attribute being modified */
3671         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3672         if (attr == NULL) {
3673                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3674                 talloc_free(tmp_ctx);
3675                 return LDB_ERR_OPERATIONS_ERROR;
3676         }
3677
3678         attrs[0] = attr->lDAPDisplayName;
3679         attrs[1] = NULL;
3680
3681         /* get the existing message from the db for the object with
3682            this GUID, returning attribute being modified. We will then
3683            use this msg as the basis for a modify call */
3684         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3685                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3686                                  DSDB_SEARCH_SHOW_DELETED |
3687                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3688                                  DSDB_SEARCH_REVEAL_INTERNALS,
3689                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3690         if (ret != LDB_SUCCESS) {
3691                 talloc_free(tmp_ctx);
3692                 return ret;
3693         }
3694         if (res->count != 1) {
3695                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3696                                        GUID_string(tmp_ctx, &la->identifier->guid));
3697                 talloc_free(tmp_ctx);
3698                 return LDB_ERR_NO_SUCH_OBJECT;
3699         }
3700         msg = res->msgs[0];
3701
3702         if (msg->num_elements == 0) {
3703                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3704                 if (ret != LDB_SUCCESS) {
3705                         ldb_module_oom(module);
3706                         talloc_free(tmp_ctx);
3707                         return LDB_ERR_OPERATIONS_ERROR;
3708                 }
3709         } else {
3710                 old_el = &msg->elements[0];
3711                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3712         }
3713
3714         /* parse the existing links */
3715         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3716         if (ret != LDB_SUCCESS) {
3717                 talloc_free(tmp_ctx);
3718                 return ret;
3719         }
3720
3721         /* get our invocationId */
3722         our_invocation_id = samdb_ntds_invocation_id(ldb);
3723         if (!our_invocation_id) {
3724                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3725                 talloc_free(tmp_ctx);
3726                 return LDB_ERR_OPERATIONS_ERROR;
3727         }
3728
3729         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
3730         if (ret != LDB_SUCCESS) {
3731                 talloc_free(tmp_ctx);
3732                 return ret;
3733         }
3734
3735         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3736         if (!W_ERROR_IS_OK(status)) {
3737                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3738                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3739                 return LDB_ERR_OPERATIONS_ERROR;
3740         }
3741
3742         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3743         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3744                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3745                                        old_el->name,
3746                                        ldb_dn_get_linearized(dsdb_dn->dn),
3747                                        ldb_dn_get_linearized(msg->dn));
3748                 return LDB_ERR_OPERATIONS_ERROR;
3749         }
3750
3751         /* re-resolve the DN by GUID, as the DRS server may give us an
3752            old DN value */
3753         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
3754         if (ret != LDB_SUCCESS) {
3755                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s",
3756                          GUID_string(tmp_ctx, &guid),
3757                          ldb_dn_get_linearized(dsdb_dn->dn)));
3758         }
3759
3760         /* see if this link already exists */
3761         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3762         if (pdn != NULL) {
3763                 /* see if this update is newer than what we have already */
3764                 struct GUID invocation_id = GUID_zero();
3765                 uint32_t version = 0;
3766                 NTTIME change_time = 0;
3767                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3768
3769                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3770                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3771                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3772
3773                 if (!replmd_update_is_newer(&invocation_id,
3774                                             &la->meta_data.originating_invocation_id,
3775                                             version,
3776                                             la->meta_data.version,
3777                                             change_time,
3778                                             la->meta_data.originating_change_time)) {
3779                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3780                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3781                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3782                         talloc_free(tmp_ctx);
3783                         return LDB_SUCCESS;
3784                 }
3785
3786                 /* get a seq_num for this change */
3787                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3788                 if (ret != LDB_SUCCESS) {
3789                         talloc_free(tmp_ctx);
3790                         return ret;
3791                 }
3792
3793                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
3794                         /* remove the existing backlink */
3795                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3796                         if (ret != LDB_SUCCESS) {
3797                                 talloc_free(tmp_ctx);
3798                                 return ret;
3799                         }
3800                 }
3801
3802                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3803                                            &la->meta_data.originating_invocation_id,
3804                                            la->meta_data.originating_usn, seq_num,
3805                                            la->meta_data.originating_change_time,
3806                                            la->meta_data.version,
3807                                            !active);
3808                 if (ret != LDB_SUCCESS) {
3809                         talloc_free(tmp_ctx);
3810                         return ret;
3811                 }
3812
3813                 if (active) {
3814                         /* add the new backlink */
3815                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3816                         if (ret != LDB_SUCCESS) {
3817                                 talloc_free(tmp_ctx);
3818                                 return ret;
3819                         }
3820                 }
3821         } else {
3822                 /* get a seq_num for this change */
3823                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3824                 if (ret != LDB_SUCCESS) {
3825                         talloc_free(tmp_ctx);
3826                         return ret;
3827                 }
3828
3829                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3830                                                 struct ldb_val, old_el->num_values+1);
3831                 if (!old_el->values) {
3832                         ldb_module_oom(module);
3833                         return LDB_ERR_OPERATIONS_ERROR;
3834                 }
3835                 old_el->num_values++;
3836
3837                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3838                                           &la->meta_data.originating_invocation_id,
3839                                           la->meta_data.originating_usn, seq_num,
3840                                           la->meta_data.originating_change_time,
3841                                           la->meta_data.version,
3842                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3843                 if (ret != LDB_SUCCESS) {
3844                         talloc_free(tmp_ctx);
3845                         return ret;
3846                 }
3847
3848                 if (active) {
3849                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3850                                                   true, attr, false);
3851                         if (ret != LDB_SUCCESS) {
3852                                 talloc_free(tmp_ctx);
3853                                 return ret;
3854                         }
3855                 }
3856         }
3857
3858         /* we only change whenChanged and uSNChanged if the seq_num
3859            has changed */
3860         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3861                 talloc_free(tmp_ctx);
3862                 return LDB_ERR_OPERATIONS_ERROR;
3863         }
3864
3865         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3866                 talloc_free(tmp_ctx);
3867                 return LDB_ERR_OPERATIONS_ERROR;
3868         }
3869
3870         ret = dsdb_check_single_valued_link(attr, old_el);
3871         if (ret != LDB_SUCCESS) {
3872                 talloc_free(tmp_ctx);
3873                 return ret;
3874         }
3875
3876         ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
3877         if (ret != LDB_SUCCESS) {
3878                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
3879                           ldb_errstring(ldb),
3880                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
3881                 talloc_free(tmp_ctx);
3882                 return ret;
3883         }
3884
3885         talloc_free(tmp_ctx);
3886
3887         return ret;
3888 }
3889
3890 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
3891 {
3892         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
3893                 return replmd_extended_replicated_objects(module, req);
3894         }
3895
3896         return ldb_next_request(module, req);
3897 }
3898
3899
3900 /*
3901   we hook into the transaction operations to allow us to
3902   perform the linked attribute updates at the end of the whole
3903   transaction. This allows a forward linked attribute to be created
3904   before the object is created. During a vampire, w2k8 sends us linked
3905   attributes before the objects they are part of.
3906  */
3907 static int replmd_start_transaction(struct ldb_module *module)
3908 {
3909         /* create our private structure for this transaction */
3910         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
3911                                                                 struct replmd_private);
3912         replmd_txn_cleanup(replmd_private);
3913
3914         /* free any leftover mod_usn records from cancelled
3915            transactions */
3916         while (replmd_private->ncs) {
3917                 struct nc_entry *e = replmd_private->ncs;
3918                 DLIST_REMOVE(replmd_private->ncs, e);
3919                 talloc_free(e);
3920         }
3921
3922         return ldb_next_start_trans(module);
3923 }
3924
3925 /*
3926   on prepare commit we loop over our queued la_context structures and
3927   apply each of them
3928  */
3929 static int replmd_prepare_commit(struct ldb_module *module)
3930 {
3931         struct replmd_private *replmd_private =
3932                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3933         struct la_entry *la, *prev;
3934         struct la_backlink *bl;
3935         int ret;
3936
3937         /* walk the list backwards, to do the first entry first, as we
3938          * added the entries with DLIST_ADD() which puts them at the
3939          * start of the list */
3940         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
3941                 prev = DLIST_PREV(la);
3942                 DLIST_REMOVE(replmd_private->la_list, la);
3943                 ret = replmd_process_linked_attribute(module, la);
3944                 if (ret != LDB_SUCCESS) {
3945                         replmd_txn_cleanup(replmd_private);
3946                         return ret;
3947                 }
3948         }
3949
3950         /* process our backlink list, creating and deleting backlinks
3951            as necessary */
3952         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
3953                 ret = replmd_process_backlink(module, bl);
3954                 if (ret != LDB_SUCCESS) {
3955                         replmd_txn_cleanup(replmd_private);
3956                         return ret;
3957                 }
3958         }
3959
3960         replmd_txn_cleanup(replmd_private);
3961
3962         /* possibly change @REPLCHANGED */
3963         ret = replmd_notify_store(module);
3964         if (ret != LDB_SUCCESS) {
3965                 return ret;
3966         }
3967
3968         return ldb_next_prepare_commit(module);
3969 }
3970
3971 static int replmd_del_transaction(struct ldb_module *module)
3972 {
3973         struct replmd_private *replmd_private =
3974                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3975         replmd_txn_cleanup(replmd_private);
3976
3977         return ldb_next_del_trans(module);
3978 }
3979
3980
3981 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
3982         .name          = "repl_meta_data",
3983         .init_context      = replmd_init,
3984         .add               = replmd_add,
3985         .modify            = replmd_modify,
3986         .rename            = replmd_rename,
3987         .del               = replmd_delete,
3988         .extended          = replmd_extended,
3989         .start_transaction = replmd_start_transaction,
3990         .prepare_commit    = replmd_prepare_commit,
3991         .del_transaction   = replmd_del_transaction,
3992 };