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    Copyright (C) Matthieu Patou <mat@samba.org> 2010
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 /*
  25  *  Name: ldb
  26  *
  27  *  Component: ldb repl_meta_data module
  28  *
  29  *  Description: - add a unique objectGUID onto every new record,
  30  *               - handle whenCreated, whenChanged timestamps
  31  *               - handle uSNCreated, uSNChanged numbers
  32  *               - handle replPropertyMetaData attribute
  33  *
  34  *  Author: Simo Sorce
  35  *  Author: Stefan Metzmacher
  36  */
  37
  38 #include "includes.h"
  39 #include "ldb_module.h"
  40 #include "dsdb/samdb/samdb.h"
  41 #include "dsdb/common/proto.h"
  42 #include "../libds/common/flags.h"
  43 #include "librpc/gen_ndr/ndr_misc.h"
  44 #include "librpc/gen_ndr/ndr_drsuapi.h"
  45 #include "librpc/gen_ndr/ndr_drsblobs.h"
  46 #include "param/param.h"
  47 #include "libcli/security/dom_sid.h"
  48 #include "lib/util/dlinklist.h"
  49 #include "dsdb/samdb/ldb_modules/util.h"
  50 #include "lib/util/binsearch.h"
  51 #include "libcli/security/security.h"
  52 #include "libcli/security/session.h"
  53 #include "lib/util/tsort.h"
  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         unsigned 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, DSDB_FLAG_NEXT_MODULE);
 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         unsigned int functional_level;
 738         uint32_t ni=0;
 739         bool allow_add_guid = false;
 740         bool remove_current_guid = false;
 741         bool is_urgent = false;
 742         struct ldb_message_element *objectclass_el;
 743
 744         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 745         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 746         if (control) {
 747                 allow_add_guid = true;
 748         }
 749
 750         /* do not manipulate our control entries */
 751         if (ldb_dn_is_special(req->op.add.message->dn)) {
 752                 return ldb_next_request(module, req);
 753         }
 754
 755         ldb = ldb_module_get_ctx(module);
 756
 757         functional_level = dsdb_functional_level(ldb);
 758
 759         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 760
 761         ac = replmd_ctx_init(module, req);
 762         if (!ac) {
 763                 return LDB_ERR_OPERATIONS_ERROR;
 764         }
 765
 766         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 767         if ( guid_blob != NULL ) {
 768                 if( !allow_add_guid ) {
 769                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 770                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 771                         talloc_free(ac);
 772                         return LDB_ERR_UNWILLING_TO_PERFORM;
 773                 } else {
 774                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 775                         if ( !NT_STATUS_IS_OK(status)) {
 776                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 777                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 778                                 talloc_free(ac);
 779                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 780                         }
 781                         /* we remove this attribute as it can be a string and will not be treated
 782                         correctly and then we will readd it latter on in the good format*/
 783                         remove_current_guid = true;
 784                 }
 785         } else {
 786                 /* a new GUID */
 787                 guid = GUID_random();
 788         }
 789
 790         /* Get a sequence number from the backend */
 791         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 792         if (ret != LDB_SUCCESS) {
 793                 talloc_free(ac);
 794                 return ret;
 795         }
 796
 797         /* get our invocationId */
 798         our_invocation_id = samdb_ntds_invocation_id(ldb);
 799         if (!our_invocation_id) {
 800                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 801                               "replmd_add: unable to find invocationId\n");
 802                 talloc_free(ac);
 803                 return LDB_ERR_OPERATIONS_ERROR;
 804         }
 805
 806         /* we have to copy the message as the caller might have it as a const */
 807         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 808         if (msg == NULL) {
 809                 ldb_oom(ldb);
 810                 talloc_free(ac);
 811                 return LDB_ERR_OPERATIONS_ERROR;
 812         }
 813
 814         /* generated times */
 815         unix_to_nt_time(&now, t);
 816         time_str = ldb_timestring(msg, t);
 817         if (!time_str) {
 818                 ldb_oom(ldb);
 819                 talloc_free(ac);
 820                 return LDB_ERR_OPERATIONS_ERROR;
 821         }
 822         if (remove_current_guid) {
 823                 ldb_msg_remove_attr(msg,"objectGUID");
 824         }
 825
 826         /*
 827          * remove autogenerated attributes
 828          */
 829         ldb_msg_remove_attr(msg, "whenCreated");
 830         ldb_msg_remove_attr(msg, "whenChanged");
 831         ldb_msg_remove_attr(msg, "uSNCreated");
 832         ldb_msg_remove_attr(msg, "uSNChanged");
 833         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 834
 835         /*
 836          * readd replicated attributes
 837          */
 838         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 839         if (ret != LDB_SUCCESS) {
 840                 ldb_oom(ldb);
 841                 talloc_free(ac);
 842                 return ret;
 843         }
 844
 845         /* build the replication meta_data */
 846         ZERO_STRUCT(nmd);
 847         nmd.version             = 1;
 848         nmd.ctr.ctr1.count      = msg->num_elements;
 849         nmd.ctr.ctr1.array      = talloc_array(msg,
 850                                                struct replPropertyMetaData1,
 851                                                nmd.ctr.ctr1.count);
 852         if (!nmd.ctr.ctr1.array) {
 853                 ldb_oom(ldb);
 854                 talloc_free(ac);
 855                 return LDB_ERR_OPERATIONS_ERROR;
 856         }
 857
 858         for (i=0; i < msg->num_elements; i++) {
 859                 struct ldb_message_element *e = &msg->elements[i];
 860                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 861                 const struct dsdb_attribute *sa;
 862
 863                 if (e->name[0] == '@') continue;
 864
 865                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 866                 if (!sa) {
 867                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 868                                       "replmd_add: attribute '%s' not defined in schema\n",
 869                                       e->name);
 870                         talloc_free(ac);
 871                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 872                 }
 873
 874                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 875                         /* if the attribute is not replicated (0x00000001)
 876                          * or constructed (0x00000004) it has no metadata
 877                          */
 878                         continue;
 879                 }
 880
 881                 if (sa->linkID != 0 && functional_level > DS_DOMAIN_FUNCTION_2000) {
 882                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 883                         if (ret != LDB_SUCCESS) {
 884                                 talloc_free(ac);
 885                                 return ret;
 886                         }
 887                         /* linked attributes are not stored in
 888                            replPropertyMetaData in FL above w2k */
 889                         continue;
 890                 }
 891
 892                 m->attid                        = sa->attributeID_id;
 893                 m->version                      = 1;
 894                 m->originating_change_time      = now;
 895                 m->originating_invocation_id    = *our_invocation_id;
 896                 m->originating_usn              = ac->seq_num;
 897                 m->local_usn                    = ac->seq_num;
 898                 ni++;
 899         }
 900
 901         /* fix meta data count */
 902         nmd.ctr.ctr1.count = ni;
 903
 904         /*
 905          * sort meta data array, and move the rdn attribute entry to the end
 906          */
 907         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 908         if (ret != LDB_SUCCESS) {
 909                 talloc_free(ac);
 910                 return ret;
 911         }
 912
 913         /* generated NDR encoded values */
 914         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 915                                        &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         LDB_REQ_SET_LOCATION(down_req);
 974         if (ret != LDB_SUCCESS) {
 975                 talloc_free(ac);
 976                 return ret;
 977         }
 978
 979         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
 980                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
 981                 if (ret != LDB_SUCCESS) {
 982                         talloc_free(ac);
 983                         return ret;
 984                 }
 985         }
 986
 987         /* mark the control done */
 988         if (control) {
 989                 control->critical = 0;
 990         }
 991
 992         /* go on with the call chain */
 993         return ldb_next_request(module, down_req);
 994 }
 995
 996
 997 /*
 998  * update the replPropertyMetaData for one element
 999  */
1000 static int replmd_update_rpmd_element(struct ldb_context *ldb,
1001                                       struct ldb_message *msg,
1002                                       struct ldb_message_element *el,
1003                                       struct ldb_message_element *old_el,
1004                                       struct replPropertyMetaDataBlob *omd,
1005                                       const struct dsdb_schema *schema,
1006                                       uint64_t *seq_num,
1007                                       const struct GUID *our_invocation_id,
1008                                       NTTIME now)
1009 {
1010         uint32_t i;
1011         const struct dsdb_attribute *a;
1012         struct replPropertyMetaData1 *md1;
1013
1014         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1015         if (a == NULL) {
1016                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1017                          el->name));
1018                 return LDB_ERR_OPERATIONS_ERROR;
1019         }
1020
1021         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1022                 return LDB_SUCCESS;
1023         }
1024
1025         /* if the attribute's value haven't changed then return LDB_SUCCESS     */
1026         if (old_el != NULL && ldb_msg_element_compare(el, old_el) == 0) {
1027                 return LDB_SUCCESS;
1028         }
1029
1030         for (i=0; i<omd->ctr.ctr1.count; i++) {
1031                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1032         }
1033
1034         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1035                 /* linked attributes are not stored in
1036                    replPropertyMetaData in FL above w2k, but we do
1037                    raise the seqnum for the object  */
1038                 if (*seq_num == 0 &&
1039                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1040                         return LDB_ERR_OPERATIONS_ERROR;
1041                 }
1042                 return LDB_SUCCESS;
1043         }
1044
1045         if (i == omd->ctr.ctr1.count) {
1046                 /* we need to add a new one */
1047                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1048                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1049                 if (omd->ctr.ctr1.array == NULL) {
1050                         ldb_oom(ldb);
1051                         return LDB_ERR_OPERATIONS_ERROR;
1052                 }
1053                 omd->ctr.ctr1.count++;
1054                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1055         }
1056
1057         /* Get a new sequence number from the backend. We only do this
1058          * if we have a change that requires a new
1059          * replPropertyMetaData element
1060          */
1061         if (*seq_num == 0) {
1062                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1063                 if (ret != LDB_SUCCESS) {
1064                         return LDB_ERR_OPERATIONS_ERROR;
1065                 }
1066         }
1067
1068         md1 = &omd->ctr.ctr1.array[i];
1069         md1->version++;
1070         md1->attid                     = a->attributeID_id;
1071         md1->originating_change_time   = now;
1072         md1->originating_invocation_id = *our_invocation_id;
1073         md1->originating_usn           = *seq_num;
1074         md1->local_usn                 = *seq_num;
1075
1076         return LDB_SUCCESS;
1077 }
1078
1079 static uint64_t find_max_local_usn(struct replPropertyMetaDataBlob omd)
1080 {
1081         uint32_t count = omd.ctr.ctr1.count;
1082         uint64_t max = 0;
1083         uint32_t i;
1084         for (i=0; i < count; i++) {
1085                 struct replPropertyMetaData1 m = omd.ctr.ctr1.array[i];
1086                 if (max < m.local_usn) {
1087                         max = m.local_usn;
1088                 }
1089         }
1090         return max;
1091 }
1092
1093 /*
1094  * update the replPropertyMetaData object each time we modify an
1095  * object. This is needed for DRS replication, as the merge on the
1096  * client is based on this object
1097  */
1098 static int replmd_update_rpmd(struct ldb_module *module,
1099                               const struct dsdb_schema *schema,
1100                               struct ldb_request *req,
1101                               struct ldb_message *msg, uint64_t *seq_num,
1102                               time_t t,
1103                               bool *is_urgent)
1104 {
1105         const struct ldb_val *omd_value;
1106         enum ndr_err_code ndr_err;
1107         struct replPropertyMetaDataBlob omd;
1108         unsigned int i;
1109         NTTIME now;
1110         const struct GUID *our_invocation_id;
1111         int ret;
1112         const char *attrs[] = { "replPropertyMetaData", "*", NULL };
1113         const char *attrs2[] = { "uSNChanged", "objectClass", NULL };
1114         struct ldb_result *res;
1115         struct ldb_context *ldb;
1116         struct ldb_message_element *objectclass_el;
1117         enum urgent_situation situation;
1118         bool rodc, rmd_is_provided;
1119
1120         ldb = ldb_module_get_ctx(module);
1121
1122         our_invocation_id = samdb_ntds_invocation_id(ldb);
1123         if (!our_invocation_id) {
1124                 /* this happens during an initial vampire while
1125                    updating the schema */
1126                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1127                 return LDB_SUCCESS;
1128         }
1129
1130         unix_to_nt_time(&now, t);
1131
1132         if (ldb_request_get_control(req, DSDB_CONTROL_CHANGEREPLMETADATA_OID)) {
1133                 rmd_is_provided = true;
1134         } else {
1135                 rmd_is_provided = false;
1136         }
1137
1138         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1139          * otherwise we consider we are updating */
1140         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1141                 situation = REPL_URGENT_ON_DELETE;
1142         } else {
1143                 situation = REPL_URGENT_ON_UPDATE;
1144         }
1145
1146         if (rmd_is_provided) {
1147                 /* In this case the change_replmetadata control was supplied */
1148                 /* We check that it's the only attribute that is provided
1149                  * (it's a rare case so it's better to keep the code simplier)
1150                  * We also check that the highest local_usn is bigger than
1151                  * uSNChanged. */
1152                 uint64_t db_seq;
1153                 if( msg->num_elements != 1 ||
1154                         strncmp(msg->elements[0].name,
1155                                 "replPropertyMetaData", 20) ) {
1156                         DEBUG(0,(__location__ ": changereplmetada control called without "\
1157                                 "a specified replPropertyMetaData attribute or with others\n"));
1158                         return LDB_ERR_OPERATIONS_ERROR;
1159                 }
1160                 if (situation == REPL_URGENT_ON_DELETE) {
1161                         DEBUG(0,(__location__ ": changereplmetada control can't be called when deleting an object\n"));
1162                         return LDB_ERR_OPERATIONS_ERROR;
1163                 }
1164                 omd_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
1165                 if (!omd_value) {
1166                         DEBUG(0,(__location__ ": replPropertyMetaData was not specified for Object %s\n",
1167                                  ldb_dn_get_linearized(msg->dn)));
1168                         return LDB_ERR_OPERATIONS_ERROR;
1169                 }
1170                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1171                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1172                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1173                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1174                                  ldb_dn_get_linearized(msg->dn)));
1175                         return LDB_ERR_OPERATIONS_ERROR;
1176                 }
1177                 *seq_num = find_max_local_usn(omd);
1178
1179                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs2,
1180                                             DSDB_FLAG_NEXT_MODULE |
1181                                             DSDB_SEARCH_SHOW_RECYCLED |
1182                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1183                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1184                                             DSDB_SEARCH_REVEAL_INTERNALS);
1185
1186                 if (ret != LDB_SUCCESS || res->count != 1) {
1187                         DEBUG(0,(__location__ ": Object %s failed to find uSNChanged\n",
1188                                  ldb_dn_get_linearized(msg->dn)));
1189                         return LDB_ERR_OPERATIONS_ERROR;
1190                 }
1191
1192                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1193                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1194                                                                 situation)) {
1195                         *is_urgent = true;
1196                 }
1197
1198                 db_seq = ldb_msg_find_attr_as_uint64(res->msgs[0], "uSNChanged", 0);
1199                 if (*seq_num <= db_seq) {
1200                         DEBUG(0,(__location__ ": changereplmetada control provided but max(local_usn)"\
1201                                               " is less or equal to uSNChanged (max = %lld uSNChanged = %lld)\n",
1202                                  (long long)*seq_num, (long long)db_seq));
1203                         return LDB_ERR_OPERATIONS_ERROR;
1204                 }
1205
1206         } else {
1207                 /* search for the existing replPropertyMetaDataBlob. We need
1208                  * to use REVEAL and ask for DNs in storage format to support
1209                  * the check for values being the same in
1210                  * replmd_update_rpmd_element()
1211                  */
1212                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
1213                                             DSDB_FLAG_NEXT_MODULE |
1214                                             DSDB_SEARCH_SHOW_RECYCLED |
1215                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1216                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1217                                             DSDB_SEARCH_REVEAL_INTERNALS);
1218                 if (ret != LDB_SUCCESS || res->count != 1) {
1219                         DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1220                                  ldb_dn_get_linearized(msg->dn)));
1221                         return LDB_ERR_OPERATIONS_ERROR;
1222                 }
1223
1224                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1225                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1226                                                                 situation)) {
1227                         *is_urgent = true;
1228                 }
1229
1230                 omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1231                 if (!omd_value) {
1232                         DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1233                                  ldb_dn_get_linearized(msg->dn)));
1234                         return LDB_ERR_OPERATIONS_ERROR;
1235                 }
1236
1237                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1238                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1239                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1240                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1241                                  ldb_dn_get_linearized(msg->dn)));
1242                         return LDB_ERR_OPERATIONS_ERROR;
1243                 }
1244
1245                 if (omd.version != 1) {
1246                         DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1247                                  omd.version, ldb_dn_get_linearized(msg->dn)));
1248                         return LDB_ERR_OPERATIONS_ERROR;
1249                 }
1250
1251                 for (i=0; i<msg->num_elements; i++) {
1252                         struct ldb_message_element *old_el;
1253                         old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1254                         ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1255                                                          our_invocation_id, now);
1256                         if (ret != LDB_SUCCESS) {
1257                                 return ret;
1258                         }
1259
1260                         if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1261                                 *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1262                         }
1263
1264                 }
1265         }
1266         /*
1267          * replmd_update_rpmd_element has done an update if the
1268          * seq_num is set
1269          */
1270         if (*seq_num != 0) {
1271                 struct ldb_val *md_value;
1272                 struct ldb_message_element *el;
1273
1274                 /*if we are RODC and this is a DRSR update then its ok*/
1275                 if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
1276                         ret = samdb_rodc(ldb, &rodc);
1277                         if (ret != LDB_SUCCESS) {
1278                                 DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
1279                         } else if (rodc) {
1280                                 ldb_asprintf_errstring(ldb, "RODC modify is forbidden\n");
1281                                 return LDB_ERR_REFERRAL;
1282                         }
1283                 }
1284
1285                 md_value = talloc(msg, struct ldb_val);
1286                 if (md_value == NULL) {
1287                         ldb_oom(ldb);
1288                         return LDB_ERR_OPERATIONS_ERROR;
1289                 }
1290
1291                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1292                 if (ret != LDB_SUCCESS) {
1293                         return ret;
1294                 }
1295
1296                 ndr_err = ndr_push_struct_blob(md_value, msg, &omd,
1297                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1298                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1299                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1300                                  ldb_dn_get_linearized(msg->dn)));
1301                         return LDB_ERR_OPERATIONS_ERROR;
1302                 }
1303
1304                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1305                 if (ret != LDB_SUCCESS) {
1306                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1307                                  ldb_dn_get_linearized(msg->dn)));
1308                         return ret;
1309                 }
1310
1311                 el->num_values = 1;
1312                 el->values = md_value;
1313         }
1314
1315         return LDB_SUCCESS;
1316 }
1317
1318 struct parsed_dn {
1319         struct dsdb_dn *dsdb_dn;
1320         struct GUID *guid;
1321         struct ldb_val *v;
1322 };
1323
1324 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1325 {
1326         return GUID_compare(pdn1->guid, pdn2->guid);
1327 }
1328
1329 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1330 {
1331         struct parsed_dn *ret;
1332         if (dn && GUID_all_zero(guid)) {
1333                 /* when updating a link using DRS, we sometimes get a
1334                    NULL GUID. We then need to try and match by DN */
1335                 int i;
1336                 for (i=0; i<count; i++) {
1337                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1338                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1339                                 return &pdn[i];
1340                         }
1341                 }
1342                 return NULL;
1343         }
1344         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1345         return ret;
1346 }
1347
1348 /*
1349   get a series of message element values as an array of DNs and GUIDs
1350   the result is sorted by GUID
1351  */
1352 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1353                           struct ldb_message_element *el, struct parsed_dn **pdn,
1354                           const char *ldap_oid)
1355 {
1356         unsigned int i;
1357         struct ldb_context *ldb = ldb_module_get_ctx(module);
1358
1359         if (el == NULL) {
1360                 *pdn = NULL;
1361                 return LDB_SUCCESS;
1362         }
1363
1364         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1365         if (!*pdn) {
1366                 ldb_module_oom(module);
1367                 return LDB_ERR_OPERATIONS_ERROR;
1368         }
1369
1370         for (i=0; i<el->num_values; i++) {
1371                 struct ldb_val *v = &el->values[i];
1372                 NTSTATUS status;
1373                 struct ldb_dn *dn;
1374                 struct parsed_dn *p;
1375
1376                 p = &(*pdn)[i];
1377
1378                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1379                 if (p->dsdb_dn == NULL) {
1380                         return LDB_ERR_INVALID_DN_SYNTAX;
1381                 }
1382
1383                 dn = p->dsdb_dn->dn;
1384
1385                 p->guid = talloc(*pdn, struct GUID);
1386                 if (p->guid == NULL) {
1387                         ldb_module_oom(module);
1388                         return LDB_ERR_OPERATIONS_ERROR;
1389                 }
1390
1391                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1392                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1393                         /* we got a DN without a GUID - go find the GUID */
1394                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1395                         if (ret != LDB_SUCCESS) {
1396                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1397                                                        ldb_dn_get_linearized(dn));
1398                                 return ret;
1399                         }
1400                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1401                         if (ret != LDB_SUCCESS) {
1402                                 return ret;
1403                         }
1404                 } else if (!NT_STATUS_IS_OK(status)) {
1405                         return LDB_ERR_OPERATIONS_ERROR;
1406                 }
1407
1408                 /* keep a pointer to the original ldb_val */
1409                 p->v = v;
1410         }
1411
1412         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1413
1414         return LDB_SUCCESS;
1415 }
1416
1417 /*
1418   build a new extended DN, including all meta data fields
1419
1420   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1421   RMD_ADDTIME         = originating_add_time
1422   RMD_INVOCID         = originating_invocation_id
1423   RMD_CHANGETIME      = originating_change_time
1424   RMD_ORIGINATING_USN = originating_usn
1425   RMD_LOCAL_USN       = local_usn
1426   RMD_VERSION         = version
1427  */
1428 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1429                                const struct GUID *invocation_id, uint64_t seq_num,
1430                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1431 {
1432         struct ldb_dn *dn = dsdb_dn->dn;
1433         const char *tstring, *usn_string, *flags_string;
1434         struct ldb_val tval;
1435         struct ldb_val iid;
1436         struct ldb_val usnv, local_usnv;
1437         struct ldb_val vers, flagsv;
1438         NTSTATUS status;
1439         int ret;
1440         const char *dnstring;
1441         char *vstring;
1442         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1443
1444         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1445         if (!tstring) {
1446                 return LDB_ERR_OPERATIONS_ERROR;
1447         }
1448         tval = data_blob_string_const(tstring);
1449
1450         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1451         if (!usn_string) {
1452                 return LDB_ERR_OPERATIONS_ERROR;
1453         }
1454         usnv = data_blob_string_const(usn_string);
1455
1456         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1457         if (!usn_string) {
1458                 return LDB_ERR_OPERATIONS_ERROR;
1459         }
1460         local_usnv = data_blob_string_const(usn_string);
1461
1462         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1463         if (!vstring) {
1464                 return LDB_ERR_OPERATIONS_ERROR;
1465         }
1466         vers = data_blob_string_const(vstring);
1467
1468         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1469         if (!NT_STATUS_IS_OK(status)) {
1470                 return LDB_ERR_OPERATIONS_ERROR;
1471         }
1472
1473         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1474         if (!flags_string) {
1475                 return LDB_ERR_OPERATIONS_ERROR;
1476         }
1477         flagsv = data_blob_string_const(flags_string);
1478
1479         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1480         if (ret != LDB_SUCCESS) return ret;
1481         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1482         if (ret != LDB_SUCCESS) return ret;
1483         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1484         if (ret != LDB_SUCCESS) return ret;
1485         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1486         if (ret != LDB_SUCCESS) return ret;
1487         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1488         if (ret != LDB_SUCCESS) return ret;
1489         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1490         if (ret != LDB_SUCCESS) return ret;
1491         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1492         if (ret != LDB_SUCCESS) return ret;
1493
1494         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1495         if (dnstring == NULL) {
1496                 return LDB_ERR_OPERATIONS_ERROR;
1497         }
1498         *v = data_blob_string_const(dnstring);
1499
1500         return LDB_SUCCESS;
1501 }
1502
1503 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1504                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1505                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1506                                 uint32_t version, bool deleted);
1507
1508 /*
1509   check if any links need upgrading from w2k format
1510
1511   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.
1512  */
1513 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1514 {
1515         uint32_t i;
1516         for (i=0; i<count; i++) {
1517                 NTSTATUS status;
1518                 uint32_t version;
1519                 int ret;
1520
1521                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1522                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1523                         continue;
1524                 }
1525
1526                 /* it's an old one that needs upgrading */
1527                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1528                                            1, 1, 0, 0, false);
1529                 if (ret != LDB_SUCCESS) {
1530                         return ret;
1531                 }
1532         }
1533         return LDB_SUCCESS;
1534 }
1535
1536 /*
1537   update an extended DN, including all meta data fields
1538
1539   see replmd_build_la_val for value names
1540  */
1541 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1542                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1543                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1544                                 uint32_t version, bool deleted)
1545 {
1546         struct ldb_dn *dn = dsdb_dn->dn;
1547         const char *tstring, *usn_string, *flags_string;
1548         struct ldb_val tval;
1549         struct ldb_val iid;
1550         struct ldb_val usnv, local_usnv;
1551         struct ldb_val vers, flagsv;
1552         const struct ldb_val *old_addtime;
1553         uint32_t old_version;
1554         NTSTATUS status;
1555         int ret;
1556         const char *dnstring;
1557         char *vstring;
1558         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1559
1560         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1561         if (!tstring) {
1562                 return LDB_ERR_OPERATIONS_ERROR;
1563         }
1564         tval = data_blob_string_const(tstring);
1565
1566         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1567         if (!usn_string) {
1568                 return LDB_ERR_OPERATIONS_ERROR;
1569         }
1570         usnv = data_blob_string_const(usn_string);
1571
1572         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1573         if (!usn_string) {
1574                 return LDB_ERR_OPERATIONS_ERROR;
1575         }
1576         local_usnv = data_blob_string_const(usn_string);
1577
1578         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1579         if (!NT_STATUS_IS_OK(status)) {
1580                 return LDB_ERR_OPERATIONS_ERROR;
1581         }
1582
1583         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1584         if (!flags_string) {
1585                 return LDB_ERR_OPERATIONS_ERROR;
1586         }
1587         flagsv = data_blob_string_const(flags_string);
1588
1589         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1590         if (ret != LDB_SUCCESS) return ret;
1591
1592         /* get the ADDTIME from the original */
1593         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1594         if (old_addtime == NULL) {
1595                 old_addtime = &tval;
1596         }
1597         if (dsdb_dn != old_dsdb_dn) {
1598                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1599                 if (ret != LDB_SUCCESS) return ret;
1600         }
1601
1602         /* use our invocation id */
1603         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1604         if (ret != LDB_SUCCESS) return ret;
1605
1606         /* changetime is the current time */
1607         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1608         if (ret != LDB_SUCCESS) return ret;
1609
1610         /* update the USN */
1611         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1612         if (ret != LDB_SUCCESS) return ret;
1613
1614         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1615         if (ret != LDB_SUCCESS) return ret;
1616
1617         /* increase the version by 1 */
1618         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1619         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1620                 version = old_version+1;
1621         }
1622         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1623         vers = data_blob_string_const(vstring);
1624         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1625         if (ret != LDB_SUCCESS) return ret;
1626
1627         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1628         if (dnstring == NULL) {
1629                 return LDB_ERR_OPERATIONS_ERROR;
1630         }
1631         *v = data_blob_string_const(dnstring);
1632
1633         return LDB_SUCCESS;
1634 }
1635
1636 /*
1637   handle adding a linked attribute
1638  */
1639 static int replmd_modify_la_add(struct ldb_module *module,
1640                                 const struct dsdb_schema *schema,
1641                                 struct ldb_message *msg,
1642                                 struct ldb_message_element *el,
1643                                 struct ldb_message_element *old_el,
1644                                 const struct dsdb_attribute *schema_attr,
1645                                 uint64_t seq_num,
1646                                 time_t t,
1647                                 struct GUID *msg_guid)
1648 {
1649         unsigned int i;
1650         struct parsed_dn *dns, *old_dns;
1651         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1652         int ret;
1653         struct ldb_val *new_values = NULL;
1654         unsigned int num_new_values = 0;
1655         unsigned old_num_values = old_el?old_el->num_values:0;
1656         const struct GUID *invocation_id;
1657         struct ldb_context *ldb = ldb_module_get_ctx(module);
1658         NTTIME now;
1659
1660         unix_to_nt_time(&now, t);
1661
1662         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1663         if (ret != LDB_SUCCESS) {
1664                 talloc_free(tmp_ctx);
1665                 return ret;
1666         }
1667
1668         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1669         if (ret != LDB_SUCCESS) {
1670                 talloc_free(tmp_ctx);
1671                 return ret;
1672         }
1673
1674         invocation_id = samdb_ntds_invocation_id(ldb);
1675         if (!invocation_id) {
1676                 talloc_free(tmp_ctx);
1677                 return LDB_ERR_OPERATIONS_ERROR;
1678         }
1679
1680         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1681         if (ret != LDB_SUCCESS) {
1682                 talloc_free(tmp_ctx);
1683                 return ret;
1684         }
1685
1686         /* for each new value, see if it exists already with the same GUID */
1687         for (i=0; i<el->num_values; i++) {
1688                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1689                 if (p == NULL) {
1690                         /* this is a new linked attribute value */
1691                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1692                         if (new_values == NULL) {
1693                                 ldb_module_oom(module);
1694                                 talloc_free(tmp_ctx);
1695                                 return LDB_ERR_OPERATIONS_ERROR;
1696                         }
1697                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1698                                                   invocation_id, seq_num, seq_num, now, 0, false);
1699                         if (ret != LDB_SUCCESS) {
1700                                 talloc_free(tmp_ctx);
1701                                 return ret;
1702                         }
1703                         num_new_values++;
1704                 } else {
1705                         /* this is only allowed if the GUID was
1706                            previously deleted. */
1707                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1708
1709                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1710                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1711                                                        el->name, GUID_string(tmp_ctx, p->guid));
1712                                 talloc_free(tmp_ctx);
1713                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1714                         }
1715                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1716                                                    invocation_id, seq_num, seq_num, now, 0, false);
1717                         if (ret != LDB_SUCCESS) {
1718                                 talloc_free(tmp_ctx);
1719                                 return ret;
1720                         }
1721                 }
1722
1723                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1724                 if (ret != LDB_SUCCESS) {
1725                         talloc_free(tmp_ctx);
1726                         return ret;
1727                 }
1728         }
1729
1730         /* add the new ones on to the end of the old values, constructing a new el->values */
1731         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1732                                     struct ldb_val,
1733                                     old_num_values+num_new_values);
1734         if (el->values == NULL) {
1735                 ldb_module_oom(module);
1736                 return LDB_ERR_OPERATIONS_ERROR;
1737         }
1738
1739         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1740         el->num_values = old_num_values + num_new_values;
1741
1742         talloc_steal(msg->elements, el->values);
1743         talloc_steal(el->values, new_values);
1744
1745         talloc_free(tmp_ctx);
1746
1747         /* we now tell the backend to replace all existing values
1748            with the one we have constructed */
1749         el->flags = LDB_FLAG_MOD_REPLACE;
1750
1751         return LDB_SUCCESS;
1752 }
1753
1754
1755 /*
1756   handle deleting all active linked attributes
1757  */
1758 static int replmd_modify_la_delete(struct ldb_module *module,
1759                                    const struct dsdb_schema *schema,
1760                                    struct ldb_message *msg,
1761                                    struct ldb_message_element *el,
1762                                    struct ldb_message_element *old_el,
1763                                    const struct dsdb_attribute *schema_attr,
1764                                    uint64_t seq_num,
1765                                    time_t t,
1766                                    struct GUID *msg_guid)
1767 {
1768         unsigned int i;
1769         struct parsed_dn *dns, *old_dns;
1770         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1771         int ret;
1772         const struct GUID *invocation_id;
1773         struct ldb_context *ldb = ldb_module_get_ctx(module);
1774         NTTIME now;
1775
1776         unix_to_nt_time(&now, t);
1777
1778         /* check if there is nothing to delete */
1779         if ((!old_el || old_el->num_values == 0) &&
1780             el->num_values == 0) {
1781                 return LDB_SUCCESS;
1782         }
1783
1784         if (!old_el || old_el->num_values == 0) {
1785                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1786         }
1787
1788         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1789         if (ret != LDB_SUCCESS) {
1790                 talloc_free(tmp_ctx);
1791                 return ret;
1792         }
1793
1794         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1795         if (ret != LDB_SUCCESS) {
1796                 talloc_free(tmp_ctx);
1797                 return ret;
1798         }
1799
1800         invocation_id = samdb_ntds_invocation_id(ldb);
1801         if (!invocation_id) {
1802                 return LDB_ERR_OPERATIONS_ERROR;
1803         }
1804
1805         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
1806         if (ret != LDB_SUCCESS) {
1807                 talloc_free(tmp_ctx);
1808                 return ret;
1809         }
1810
1811         el->values = NULL;
1812
1813         /* see if we are being asked to delete any links that
1814            don't exist or are already deleted */
1815         for (i=0; i<el->num_values; i++) {
1816                 struct parsed_dn *p = &dns[i];
1817                 struct parsed_dn *p2;
1818                 uint32_t rmd_flags;
1819
1820                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1821                 if (!p2) {
1822                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1823                                                el->name, GUID_string(tmp_ctx, p->guid));
1824                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1825                 }
1826                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1827                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1828                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1829                                                el->name, GUID_string(tmp_ctx, p->guid));
1830                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1831                 }
1832         }
1833
1834         /* for each new value, see if it exists already with the same GUID
1835            if it is not already deleted and matches the delete list then delete it
1836         */
1837         for (i=0; i<old_el->num_values; i++) {
1838                 struct parsed_dn *p = &old_dns[i];
1839                 uint32_t rmd_flags;
1840
1841                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1842                         continue;
1843                 }
1844
1845                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1846                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1847
1848                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1849                                            invocation_id, seq_num, seq_num, now, 0, true);
1850                 if (ret != LDB_SUCCESS) {
1851                         talloc_free(tmp_ctx);
1852                         return ret;
1853                 }
1854
1855                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1856                 if (ret != LDB_SUCCESS) {
1857                         talloc_free(tmp_ctx);
1858                         return ret;
1859                 }
1860         }
1861
1862         el->values = talloc_steal(msg->elements, old_el->values);
1863         el->num_values = old_el->num_values;
1864
1865         talloc_free(tmp_ctx);
1866
1867         /* we now tell the backend to replace all existing values
1868            with the one we have constructed */
1869         el->flags = LDB_FLAG_MOD_REPLACE;
1870
1871         return LDB_SUCCESS;
1872 }
1873
1874 /*
1875   handle replacing a linked attribute
1876  */
1877 static int replmd_modify_la_replace(struct ldb_module *module,
1878                                     const struct dsdb_schema *schema,
1879                                     struct ldb_message *msg,
1880                                     struct ldb_message_element *el,
1881                                     struct ldb_message_element *old_el,
1882                                     const struct dsdb_attribute *schema_attr,
1883                                     uint64_t seq_num,
1884                                     time_t t,
1885                                     struct GUID *msg_guid)
1886 {
1887         unsigned int i;
1888         struct parsed_dn *dns, *old_dns;
1889         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1890         int ret;
1891         const struct GUID *invocation_id;
1892         struct ldb_context *ldb = ldb_module_get_ctx(module);
1893         struct ldb_val *new_values = NULL;
1894         unsigned int num_new_values = 0;
1895         unsigned int old_num_values = old_el?old_el->num_values:0;
1896         NTTIME now;
1897
1898         unix_to_nt_time(&now, t);
1899
1900         /* check if there is nothing to replace */
1901         if ((!old_el || old_el->num_values == 0) &&
1902             el->num_values == 0) {
1903                 return LDB_SUCCESS;
1904         }
1905
1906         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1907         if (ret != LDB_SUCCESS) {
1908                 talloc_free(tmp_ctx);
1909                 return ret;
1910         }
1911
1912         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1913         if (ret != LDB_SUCCESS) {
1914                 talloc_free(tmp_ctx);
1915                 return ret;
1916         }
1917
1918         invocation_id = samdb_ntds_invocation_id(ldb);
1919         if (!invocation_id) {
1920                 return LDB_ERR_OPERATIONS_ERROR;
1921         }
1922
1923         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1924         if (ret != LDB_SUCCESS) {
1925                 talloc_free(tmp_ctx);
1926                 return ret;
1927         }
1928
1929         /* mark all the old ones as deleted */
1930         for (i=0; i<old_num_values; i++) {
1931                 struct parsed_dn *old_p = &old_dns[i];
1932                 struct parsed_dn *p;
1933                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1934
1935                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1936
1937                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1938                 if (ret != LDB_SUCCESS) {
1939                         talloc_free(tmp_ctx);
1940                         return ret;
1941                 }
1942
1943                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1944                 if (p) {
1945                         /* we don't delete it if we are re-adding it */
1946                         continue;
1947                 }
1948
1949                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1950                                            invocation_id, seq_num, seq_num, now, 0, true);
1951                 if (ret != LDB_SUCCESS) {
1952                         talloc_free(tmp_ctx);
1953                         return ret;
1954                 }
1955         }
1956
1957         /* for each new value, either update its meta-data, or add it
1958          * to old_el
1959         */
1960         for (i=0; i<el->num_values; i++) {
1961                 struct parsed_dn *p = &dns[i], *old_p;
1962
1963                 if (old_dns &&
1964                     (old_p = parsed_dn_find(old_dns,
1965                                             old_num_values, p->guid, NULL)) != NULL) {
1966                         /* update in place */
1967                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1968                                                    old_p->dsdb_dn, invocation_id,
1969                                                    seq_num, seq_num, now, 0, false);
1970                         if (ret != LDB_SUCCESS) {
1971                                 talloc_free(tmp_ctx);
1972                                 return ret;
1973                         }
1974                 } else {
1975                         /* add a new one */
1976                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1977                                                     num_new_values+1);
1978                         if (new_values == NULL) {
1979                                 ldb_module_oom(module);
1980                                 talloc_free(tmp_ctx);
1981                                 return LDB_ERR_OPERATIONS_ERROR;
1982                         }
1983                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1984                                                   invocation_id, seq_num, seq_num, now, 0, false);
1985                         if (ret != LDB_SUCCESS) {
1986                                 talloc_free(tmp_ctx);
1987                                 return ret;
1988                         }
1989                         num_new_values++;
1990                 }
1991
1992                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1993                 if (ret != LDB_SUCCESS) {
1994                         talloc_free(tmp_ctx);
1995                         return ret;
1996                 }
1997         }
1998
1999         /* add the new values to the end of old_el */
2000         if (num_new_values != 0) {
2001                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
2002                                             struct ldb_val, old_num_values+num_new_values);
2003                 if (el->values == NULL) {
2004                         ldb_module_oom(module);
2005                         return LDB_ERR_OPERATIONS_ERROR;
2006                 }
2007                 memcpy(&el->values[old_num_values], &new_values[0],
2008                        sizeof(struct ldb_val)*num_new_values);
2009                 el->num_values = old_num_values + num_new_values;
2010                 talloc_steal(msg->elements, new_values);
2011         } else {
2012                 el->values = old_el->values;
2013                 el->num_values = old_el->num_values;
2014                 talloc_steal(msg->elements, el->values);
2015         }
2016
2017         talloc_free(tmp_ctx);
2018
2019         /* we now tell the backend to replace all existing values
2020            with the one we have constructed */
2021         el->flags = LDB_FLAG_MOD_REPLACE;
2022
2023         return LDB_SUCCESS;
2024 }
2025
2026
2027 /*
2028   handle linked attributes in modify requests
2029  */
2030 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
2031                                                struct ldb_message *msg,
2032                                                uint64_t seq_num, time_t t)
2033 {
2034         struct ldb_result *res;
2035         unsigned int i;
2036         int ret;
2037         struct ldb_context *ldb = ldb_module_get_ctx(module);
2038         struct ldb_message *old_msg;
2039
2040         const struct dsdb_schema *schema;
2041         struct GUID old_guid;
2042
2043         if (seq_num == 0) {
2044                 /* there the replmd_update_rpmd code has already
2045                  * checked and saw that there are no linked
2046                  * attributes */
2047                 return LDB_SUCCESS;
2048         }
2049
2050         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
2051                 /* don't do anything special for linked attributes */
2052                 return LDB_SUCCESS;
2053         }
2054
2055         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
2056                                     DSDB_FLAG_NEXT_MODULE |
2057                                     DSDB_SEARCH_SHOW_RECYCLED |
2058                                     DSDB_SEARCH_REVEAL_INTERNALS |
2059                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2060         if (ret != LDB_SUCCESS) {
2061                 return ret;
2062         }
2063         schema = dsdb_get_schema(ldb, res);
2064         if (!schema) {
2065                 return LDB_ERR_OPERATIONS_ERROR;
2066         }
2067
2068         old_msg = res->msgs[0];
2069
2070         old_guid = samdb_result_guid(old_msg, "objectGUID");
2071
2072         for (i=0; i<msg->num_elements; i++) {
2073                 struct ldb_message_element *el = &msg->elements[i];
2074                 struct ldb_message_element *old_el, *new_el;
2075                 const struct dsdb_attribute *schema_attr
2076                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2077                 if (!schema_attr) {
2078                         ldb_asprintf_errstring(ldb,
2079                                                "attribute %s is not a valid attribute in schema", el->name);
2080                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
2081                 }
2082                 if (schema_attr->linkID == 0) {
2083                         continue;
2084                 }
2085                 if ((schema_attr->linkID & 1) == 1) {
2086                         /* Odd is for the target.  Illegal to modify */
2087                         ldb_asprintf_errstring(ldb,
2088                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
2089                         return LDB_ERR_UNWILLING_TO_PERFORM;
2090                 }
2091                 old_el = ldb_msg_find_element(old_msg, el->name);
2092                 switch (el->flags & LDB_FLAG_MOD_MASK) {
2093                 case LDB_FLAG_MOD_REPLACE:
2094                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2095                         break;
2096                 case LDB_FLAG_MOD_DELETE:
2097                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2098                         break;
2099                 case LDB_FLAG_MOD_ADD:
2100                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2101                         break;
2102                 default:
2103                         ldb_asprintf_errstring(ldb,
2104                                                "invalid flags 0x%x for %s linked attribute",
2105                                                el->flags, el->name);
2106                         return LDB_ERR_UNWILLING_TO_PERFORM;
2107                 }
2108                 if (ret != LDB_SUCCESS) {
2109                         return ret;
2110                 }
2111                 if (old_el) {
2112                         ldb_msg_remove_attr(old_msg, el->name);
2113                 }
2114                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2115                 new_el->num_values = el->num_values;
2116                 new_el->values = talloc_steal(msg->elements, el->values);
2117
2118                 /* TODO: this relises a bit too heavily on the exact
2119                    behaviour of ldb_msg_find_element and
2120                    ldb_msg_remove_element */
2121                 old_el = ldb_msg_find_element(msg, el->name);
2122                 if (old_el != el) {
2123                         ldb_msg_remove_element(msg, old_el);
2124                         i--;
2125                 }
2126         }
2127
2128         talloc_free(res);
2129         return ret;
2130 }
2131
2132
2133
2134 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2135 {
2136         struct ldb_context *ldb;
2137         struct replmd_replicated_request *ac;
2138         struct ldb_request *down_req;
2139         struct ldb_message *msg;
2140         time_t t = time(NULL);
2141         int ret;
2142         bool is_urgent = false;
2143         struct loadparm_context *lp_ctx;
2144         char *referral;
2145         unsigned int functional_level;
2146
2147         /* do not manipulate our control entries */
2148         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2149                 return ldb_next_request(module, req);
2150         }
2151
2152         ldb = ldb_module_get_ctx(module);
2153         functional_level = dsdb_functional_level(ldb);
2154
2155         lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2156                                  struct loadparm_context);
2157
2158         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2159
2160         ac = replmd_ctx_init(module, req);
2161         if (!ac) {
2162                 return LDB_ERR_OPERATIONS_ERROR;
2163         }
2164
2165         /* we have to copy the message as the caller might have it as a const */
2166         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2167         if (msg == NULL) {
2168                 ldb_oom(ldb);
2169                 talloc_free(ac);
2170                 return LDB_ERR_OPERATIONS_ERROR;
2171         }
2172
2173         ldb_msg_remove_attr(msg, "whenChanged");
2174         ldb_msg_remove_attr(msg, "uSNChanged");
2175
2176         ret = replmd_update_rpmd(module, ac->schema, req, msg, &ac->seq_num, t, &is_urgent);
2177         if (ret == LDB_ERR_REFERRAL) {
2178                 referral = talloc_asprintf(req,
2179                                            "ldap://%s/%s",
2180                                            lpcfg_dnsdomain(lp_ctx),
2181                                            ldb_dn_get_linearized(msg->dn));
2182                 ret = ldb_module_send_referral(req, referral);
2183                 talloc_free(ac);
2184                 return ldb_module_done(req, NULL, NULL, ret);
2185         }
2186
2187         if (ret != LDB_SUCCESS) {
2188                 talloc_free(ac);
2189                 return ret;
2190         }
2191
2192         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
2193         if (ret != LDB_SUCCESS) {
2194                 talloc_free(ac);
2195                 return ret;
2196         }
2197
2198         /* TODO:
2199          * - replace the old object with the newly constructed one
2200          */
2201
2202         ac->is_urgent = is_urgent;
2203
2204         ret = ldb_build_mod_req(&down_req, ldb, ac,
2205                                 msg,
2206                                 req->controls,
2207                                 ac, replmd_op_callback,
2208                                 req);
2209         LDB_REQ_SET_LOCATION(down_req);
2210         if (ret != LDB_SUCCESS) {
2211                 talloc_free(ac);
2212                 return ret;
2213         }
2214
2215         /* If we are in functional level 2000, then
2216          * replmd_modify_handle_linked_attribs will have done
2217          * nothing */
2218         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
2219                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
2220                 if (ret != LDB_SUCCESS) {
2221                         talloc_free(ac);
2222                         return ret;
2223                 }
2224         }
2225
2226         talloc_steal(down_req, msg);
2227
2228         /* we only change whenChanged and uSNChanged if the seq_num
2229            has changed */
2230         if (ac->seq_num != 0) {
2231                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2232                         talloc_free(ac);
2233                         return ret;
2234                 }
2235
2236                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2237                         talloc_free(ac);
2238                         return ret;
2239                 }
2240         }
2241
2242         /* go on with the call chain */
2243         return ldb_next_request(module, down_req);
2244 }
2245
2246 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2247
2248 /*
2249   handle a rename request
2250
2251   On a rename we need to do an extra ldb_modify which sets the
2252   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2253  */
2254 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2255 {
2256         struct ldb_context *ldb;
2257         struct replmd_replicated_request *ac;
2258         int ret;
2259         struct ldb_request *down_req;
2260
2261         /* do not manipulate our control entries */
2262         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2263                 return ldb_next_request(module, req);
2264         }
2265
2266         ldb = ldb_module_get_ctx(module);
2267
2268         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2269
2270         ac = replmd_ctx_init(module, req);
2271         if (!ac) {
2272                 return LDB_ERR_OPERATIONS_ERROR;
2273         }
2274         ret = ldb_build_rename_req(&down_req, ldb, ac,
2275                                    ac->req->op.rename.olddn,
2276                                    ac->req->op.rename.newdn,
2277                                    ac->req->controls,
2278                                    ac, replmd_rename_callback,
2279                                    ac->req);
2280         LDB_REQ_SET_LOCATION(down_req);
2281         if (ret != LDB_SUCCESS) {
2282                 talloc_free(ac);
2283                 return ret;
2284         }
2285
2286         /* go on with the call chain */
2287         return ldb_next_request(module, down_req);
2288 }
2289
2290 /* After the rename is compleated, update the whenchanged etc */
2291 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2292 {
2293         struct ldb_context *ldb;
2294         struct replmd_replicated_request *ac;
2295         struct ldb_request *down_req;
2296         struct ldb_message *msg;
2297         time_t t = time(NULL);
2298         int ret;
2299
2300         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2301         ldb = ldb_module_get_ctx(ac->module);
2302
2303         if (ares->error != LDB_SUCCESS) {
2304                 return ldb_module_done(ac->req, ares->controls,
2305                                         ares->response, ares->error);
2306         }
2307
2308         if (ares->type != LDB_REPLY_DONE) {
2309                 ldb_set_errstring(ldb,
2310                                   "invalid ldb_reply_type in callback");
2311                 talloc_free(ares);
2312                 return ldb_module_done(ac->req, NULL, NULL,
2313                                         LDB_ERR_OPERATIONS_ERROR);
2314         }
2315
2316         /* Get a sequence number from the backend */
2317         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2318         if (ret != LDB_SUCCESS) {
2319                 return ret;
2320         }
2321
2322         /* TODO:
2323          * - replace the old object with the newly constructed one
2324          */
2325
2326         msg = ldb_msg_new(ac);
2327         if (msg == NULL) {
2328                 ldb_oom(ldb);
2329                 return LDB_ERR_OPERATIONS_ERROR;
2330         }
2331
2332         msg->dn = ac->req->op.rename.newdn;
2333
2334         ret = ldb_build_mod_req(&down_req, ldb, ac,
2335                                 msg,
2336                                 req->controls,
2337                                 ac, replmd_op_callback,
2338                                 req);
2339         LDB_REQ_SET_LOCATION(down_req);
2340         if (ret != LDB_SUCCESS) {
2341                 talloc_free(ac);
2342                 return ret;
2343         }
2344         talloc_steal(down_req, msg);
2345
2346         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2347                 talloc_free(ac);
2348                 return ret;
2349         }
2350
2351         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2352                 talloc_free(ac);
2353                 return ret;
2354         }
2355
2356         /* go on with the call chain - do the modify after the rename */
2357         return ldb_next_request(ac->module, down_req);
2358 }
2359
2360 /*
2361    remove links from objects that point at this object when an object
2362    is deleted
2363  */
2364 static int replmd_delete_remove_link(struct ldb_module *module,
2365                                      const struct dsdb_schema *schema,
2366                                      struct ldb_dn *dn,
2367                                      struct ldb_message_element *el,
2368                                      const struct dsdb_attribute *sa)
2369 {
2370         unsigned int i;
2371         TALLOC_CTX *tmp_ctx = talloc_new(module);
2372         struct ldb_context *ldb = ldb_module_get_ctx(module);
2373
2374         for (i=0; i<el->num_values; i++) {
2375                 struct dsdb_dn *dsdb_dn;
2376                 NTSTATUS status;
2377                 int ret;
2378                 struct GUID guid2;
2379                 struct ldb_message *msg;
2380                 const struct dsdb_attribute *target_attr;
2381                 struct ldb_message_element *el2;
2382                 struct ldb_val dn_val;
2383
2384                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2385                         continue;
2386                 }
2387
2388                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2389                 if (!dsdb_dn) {
2390                         talloc_free(tmp_ctx);
2391                         return LDB_ERR_OPERATIONS_ERROR;
2392                 }
2393
2394                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2395                 if (!NT_STATUS_IS_OK(status)) {
2396                         talloc_free(tmp_ctx);
2397                         return LDB_ERR_OPERATIONS_ERROR;
2398                 }
2399
2400                 /* remove the link */
2401                 msg = ldb_msg_new(tmp_ctx);
2402                 if (!msg) {
2403                         ldb_module_oom(module);
2404                         talloc_free(tmp_ctx);
2405                         return LDB_ERR_OPERATIONS_ERROR;
2406                 }
2407
2408
2409                 msg->dn = dsdb_dn->dn;
2410
2411                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2412                 if (target_attr == NULL) {
2413                         continue;
2414                 }
2415
2416                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2417                 if (ret != LDB_SUCCESS) {
2418                         ldb_module_oom(module);
2419                         talloc_free(tmp_ctx);
2420                         return LDB_ERR_OPERATIONS_ERROR;
2421                 }
2422                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2423                 el2->values = &dn_val;
2424                 el2->num_values = 1;
2425
2426                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2427                 if (ret != LDB_SUCCESS) {
2428                         talloc_free(tmp_ctx);
2429                         return ret;
2430                 }
2431         }
2432         talloc_free(tmp_ctx);
2433         return LDB_SUCCESS;
2434 }
2435
2436
2437 /*
2438   handle update of replication meta data for deletion of objects
2439
2440   This also handles the mapping of delete to a rename operation
2441   to allow deletes to be replicated.
2442  */
2443 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2444 {
2445         int ret = LDB_ERR_OTHER;
2446         bool retb, disallow_move_on_delete;
2447         struct ldb_dn *old_dn, *new_dn;
2448         const char *rdn_name;
2449         const struct ldb_val *rdn_value, *new_rdn_value;
2450         struct GUID guid;
2451         struct ldb_context *ldb = ldb_module_get_ctx(module);
2452         const struct dsdb_schema *schema;
2453         struct ldb_message *msg, *old_msg;
2454         struct ldb_message_element *el;
2455         TALLOC_CTX *tmp_ctx;
2456         struct ldb_result *res, *parent_res;
2457         const char *preserved_attrs[] = {
2458                 /* yes, this really is a hard coded list. See MS-ADTS
2459                    section 3.1.1.5.5.1.1 */
2460                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2461                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2462                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2463                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2464                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2465                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2466                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2467                 "whenChanged", NULL};
2468         unsigned int i, el_count = 0;
2469         enum deletion_state { OBJECT_NOT_DELETED=1, OBJECT_DELETED=2, OBJECT_RECYCLED=3,
2470                                                 OBJECT_TOMBSTONE=4, OBJECT_REMOVED=5 };
2471         enum deletion_state deletion_state, next_deletion_state;
2472         bool enabled;
2473
2474         if (ldb_dn_is_special(req->op.del.dn)) {
2475                 return ldb_next_request(module, req);
2476         }
2477
2478         tmp_ctx = talloc_new(ldb);
2479         if (!tmp_ctx) {
2480                 ldb_oom(ldb);
2481                 return LDB_ERR_OPERATIONS_ERROR;
2482         }
2483
2484         schema = dsdb_get_schema(ldb, tmp_ctx);
2485         if (!schema) {
2486                 return LDB_ERR_OPERATIONS_ERROR;
2487         }
2488
2489         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2490
2491         /* we need the complete msg off disk, so we can work out which
2492            attributes need to be removed */
2493         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2494                                     DSDB_FLAG_NEXT_MODULE |
2495                                     DSDB_SEARCH_SHOW_RECYCLED |
2496                                     DSDB_SEARCH_REVEAL_INTERNALS |
2497                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2498         if (ret != LDB_SUCCESS) {
2499                 talloc_free(tmp_ctx);
2500                 return ret;
2501         }
2502         old_msg = res->msgs[0];
2503
2504
2505         ret = dsdb_recyclebin_enabled(module, &enabled);
2506         if (ret != LDB_SUCCESS) {
2507                 talloc_free(tmp_ctx);
2508                 return ret;
2509         }
2510
2511         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2512                 if (!enabled) {
2513                         deletion_state = OBJECT_TOMBSTONE;
2514                         next_deletion_state = OBJECT_REMOVED;
2515                 } else if (ldb_msg_check_string_attribute(old_msg, "isRecycled", "TRUE")) {
2516                         deletion_state = OBJECT_RECYCLED;
2517                         next_deletion_state = OBJECT_REMOVED;
2518                 } else {
2519                         deletion_state = OBJECT_DELETED;
2520                         next_deletion_state = OBJECT_RECYCLED;
2521                 }
2522         } else {
2523                 deletion_state = OBJECT_NOT_DELETED;
2524                 if (enabled) {
2525                         next_deletion_state = OBJECT_DELETED;
2526                 } else {
2527                         next_deletion_state = OBJECT_TOMBSTONE;
2528                 }
2529         }
2530
2531         if (next_deletion_state == OBJECT_REMOVED) {
2532                 struct auth_session_info *session_info =
2533                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2534                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2535                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2536                                         ldb_dn_get_linearized(old_msg->dn));
2537                         return LDB_ERR_UNWILLING_TO_PERFORM;
2538                 }
2539
2540                 /* it is already deleted - really remove it this time */
2541                 talloc_free(tmp_ctx);
2542                 return ldb_next_request(module, req);
2543         }
2544
2545         rdn_name = ldb_dn_get_rdn_name(old_dn);
2546         rdn_value = ldb_dn_get_rdn_val(old_dn);
2547
2548         msg = ldb_msg_new(tmp_ctx);
2549         if (msg == NULL) {
2550                 ldb_module_oom(module);
2551                 talloc_free(tmp_ctx);
2552                 return LDB_ERR_OPERATIONS_ERROR;
2553         }
2554
2555         msg->dn = old_dn;
2556
2557         if (deletion_state == OBJECT_NOT_DELETED){
2558                 /* consider the SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE flag */
2559                 disallow_move_on_delete =
2560                         (ldb_msg_find_attr_as_int(old_msg, "systemFlags", 0)
2561                                 & SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE);
2562
2563                 /* work out where we will be renaming this object to */
2564                 if (!disallow_move_on_delete) {
2565                         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn,
2566                                                           &new_dn);
2567                         if (ret != LDB_SUCCESS) {
2568                                 /* this is probably an attempted delete on a partition
2569                                  * that doesn't allow delete operations, such as the
2570                                  * schema partition */
2571                                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2572                                                            ldb_dn_get_linearized(old_dn));
2573                                 talloc_free(tmp_ctx);
2574                                 return LDB_ERR_UNWILLING_TO_PERFORM;
2575                         }
2576                 } else {
2577                         new_dn = ldb_dn_get_parent(tmp_ctx, old_dn);
2578                         if (new_dn == NULL) {
2579                                 ldb_module_oom(module);
2580                                 talloc_free(tmp_ctx);
2581                                 return LDB_ERR_OPERATIONS_ERROR;
2582                         }
2583                 }
2584
2585                 /* get the objects GUID from the search we just did */
2586                 guid = samdb_result_guid(old_msg, "objectGUID");
2587
2588                 /* Add a formatted child */
2589                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2590                                                 rdn_name,
2591                                                 rdn_value->data,
2592                                                 GUID_string(tmp_ctx, &guid));
2593                 if (!retb) {
2594                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2595                                         ldb_dn_get_linearized(new_dn)));
2596                         talloc_free(tmp_ctx);
2597                         return LDB_ERR_OPERATIONS_ERROR;
2598                 }
2599
2600                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2601                 if (ret != LDB_SUCCESS) {
2602                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2603                         ldb_module_oom(module);
2604                         talloc_free(tmp_ctx);
2605                         return ret;
2606                 }
2607                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2608         }
2609
2610         /*
2611           now we need to modify the object in the following ways:
2612
2613           - add isDeleted=TRUE
2614           - update rDN and name, with new rDN
2615           - remove linked attributes
2616           - remove objectCategory and sAMAccountType
2617           - remove attribs not on the preserved list
2618              - preserved if in above list, or is rDN
2619           - remove all linked attribs from this object
2620           - remove all links from other objects to this object
2621           - add lastKnownParent
2622           - update replPropertyMetaData?
2623
2624           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2625          */
2626
2627         /* we need the storage form of the parent GUID */
2628         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2629                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2630                                     DSDB_FLAG_NEXT_MODULE |
2631                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2632                                     DSDB_SEARCH_REVEAL_INTERNALS|
2633                                     DSDB_SEARCH_SHOW_RECYCLED);
2634         if (ret != LDB_SUCCESS) {
2635                 talloc_free(tmp_ctx);
2636                 return ret;
2637         }
2638
2639         if (deletion_state == OBJECT_NOT_DELETED){
2640                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2641                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2642                 if (ret != LDB_SUCCESS) {
2643                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2644                         ldb_module_oom(module);
2645                         talloc_free(tmp_ctx);
2646                         return ret;
2647                 }
2648                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2649         }
2650
2651         switch (next_deletion_state){
2652
2653         case OBJECT_DELETED:
2654
2655                 ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
2656                 if (ret != LDB_SUCCESS) {
2657                         DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
2658                         ldb_module_oom(module);
2659                         talloc_free(tmp_ctx);
2660                         return ret;
2661                 }
2662                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2663
2664                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_DELETE, NULL);
2665                 if (ret != LDB_SUCCESS) {
2666                         talloc_free(tmp_ctx);
2667                         ldb_module_oom(module);
2668                         return ret;
2669                 }
2670
2671                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_DELETE, NULL);
2672                 if (ret != LDB_SUCCESS) {
2673                         talloc_free(tmp_ctx);
2674                         ldb_module_oom(module);
2675                         return ret;
2676                 }
2677
2678                 break;
2679
2680         case OBJECT_RECYCLED:
2681         case OBJECT_TOMBSTONE:
2682
2683                 /* we also mark it as recycled, meaning this object can't be
2684                    recovered (we are stripping its attributes) */
2685                 if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2686                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2687                         if (ret != LDB_SUCCESS) {
2688                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2689                                 ldb_module_oom(module);
2690                                 talloc_free(tmp_ctx);
2691                                 return ret;
2692                         }
2693                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2694                 }
2695
2696                 /* work out which of the old attributes we will be removing */
2697                 for (i=0; i<old_msg->num_elements; i++) {
2698                         const struct dsdb_attribute *sa;
2699                         el = &old_msg->elements[i];
2700                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2701                         if (!sa) {
2702                                 talloc_free(tmp_ctx);
2703                                 return LDB_ERR_OPERATIONS_ERROR;
2704                         }
2705                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2706                                 /* don't remove the rDN */
2707                                 continue;
2708                         }
2709                         if (sa->linkID && sa->linkID & 1) {
2710                                 ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2711                                 if (ret != LDB_SUCCESS) {
2712                                         talloc_free(tmp_ctx);
2713                                         return LDB_ERR_OPERATIONS_ERROR;
2714                                 }
2715                                 continue;
2716                         }
2717                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2718                                 continue;
2719                         }
2720                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2721                         if (ret != LDB_SUCCESS) {
2722                                 talloc_free(tmp_ctx);
2723                                 ldb_module_oom(module);
2724                                 return ret;
2725                         }
2726                 }
2727                 break;
2728
2729         default:
2730                 break;
2731         }
2732
2733         if (deletion_state == OBJECT_NOT_DELETED) {
2734                 const struct dsdb_attribute *sa;
2735
2736                 /* work out what the new rdn value is, for updating the
2737                    rDN and name fields */
2738                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2739
2740                 sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
2741                 if (!sa) {
2742                         talloc_free(tmp_ctx);
2743                         return LDB_ERR_OPERATIONS_ERROR;
2744                 }
2745
2746                 ret = ldb_msg_add_value(msg, sa->lDAPDisplayName, new_rdn_value,
2747                                         &el);
2748                 if (ret != LDB_SUCCESS) {
2749                         talloc_free(tmp_ctx);
2750                         return ret;
2751                 }
2752                 el->flags = LDB_FLAG_MOD_REPLACE;
2753
2754                 el = ldb_msg_find_element(old_msg, "name");
2755                 if (el) {
2756                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2757                         if (ret != LDB_SUCCESS) {
2758                                 talloc_free(tmp_ctx);
2759                                 return ret;
2760                         }
2761                         el->flags = LDB_FLAG_MOD_REPLACE;
2762                 }
2763         }
2764
2765         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2766         if (ret != LDB_SUCCESS) {
2767                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2768                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2769                 talloc_free(tmp_ctx);
2770                 return ret;
2771         }
2772
2773         if (deletion_state == OBJECT_NOT_DELETED) {
2774                 /* now rename onto the new DN */
2775                 ret = dsdb_module_rename(module, old_dn, new_dn, DSDB_FLAG_NEXT_MODULE);
2776                 if (ret != LDB_SUCCESS){
2777                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2778                                  ldb_dn_get_linearized(old_dn),
2779                                  ldb_dn_get_linearized(new_dn),
2780                                  ldb_errstring(ldb)));
2781                         talloc_free(tmp_ctx);
2782                         return ret;
2783                 }
2784         }
2785
2786         talloc_free(tmp_ctx);
2787
2788         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2789 }
2790
2791
2792
2793 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2794 {
2795         return ret;
2796 }
2797
2798 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2799 {
2800         int ret = LDB_ERR_OTHER;
2801         /* TODO: do some error mapping */
2802         return ret;
2803 }
2804
2805 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2806 {
2807         struct ldb_context *ldb;
2808         struct ldb_request *change_req;
2809         enum ndr_err_code ndr_err;
2810         struct ldb_message *msg;
2811         struct replPropertyMetaDataBlob *md;
2812         struct ldb_val md_value;
2813         unsigned int i;
2814         int ret;
2815
2816         /*
2817          * TODO: check if the parent object exist
2818          */
2819
2820         /*
2821          * TODO: handle the conflict case where an object with the
2822          *       same name exist
2823          */
2824
2825         ldb = ldb_module_get_ctx(ar->module);
2826         msg = ar->objs->objects[ar->index_current].msg;
2827         md = ar->objs->objects[ar->index_current].meta_data;
2828
2829         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2830         if (ret != LDB_SUCCESS) {
2831                 return replmd_replicated_request_error(ar, ret);
2832         }
2833
2834         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2835         if (ret != LDB_SUCCESS) {
2836                 return replmd_replicated_request_error(ar, ret);
2837         }
2838
2839         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2840         if (ret != LDB_SUCCESS) {
2841                 return replmd_replicated_request_error(ar, ret);
2842         }
2843
2844         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2845         if (ret != LDB_SUCCESS) {
2846                 return replmd_replicated_request_error(ar, ret);
2847         }
2848
2849         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2850         if (ret != LDB_SUCCESS) {
2851                 return replmd_replicated_request_error(ar, ret);
2852         }
2853
2854         /* remove any message elements that have zero values */
2855         for (i=0; i<msg->num_elements; i++) {
2856                 struct ldb_message_element *el = &msg->elements[i];
2857
2858                 if (el->num_values == 0) {
2859                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2860                                  el->name));
2861                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2862                         msg->num_elements--;
2863                         i--;
2864                         continue;
2865                 }
2866         }
2867
2868         /*
2869          * the meta data array is already sorted by the caller
2870          */
2871         for (i=0; i < md->ctr.ctr1.count; i++) {
2872                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2873         }
2874         ndr_err = ndr_push_struct_blob(&md_value, msg, md,
2875                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2876         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2877                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2878                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2879         }
2880         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2881         if (ret != LDB_SUCCESS) {
2882                 return replmd_replicated_request_error(ar, ret);
2883         }
2884
2885         replmd_ldb_message_sort(msg, ar->schema);
2886
2887         if (DEBUGLVL(4)) {
2888                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2889                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2890                 talloc_free(s);
2891         }
2892
2893         ret = ldb_build_add_req(&change_req,
2894                                 ldb,
2895                                 ar,
2896                                 msg,
2897                                 ar->controls,
2898                                 ar,
2899                                 replmd_op_callback,
2900                                 ar->req);
2901         LDB_REQ_SET_LOCATION(change_req);
2902         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2903
2904         return ldb_next_request(ar->module, change_req);
2905 }
2906
2907 /*
2908    return true if an update is newer than an existing entry
2909    see section 5.11 of MS-ADTS
2910 */
2911 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2912                                    const struct GUID *update_invocation_id,
2913                                    uint32_t current_version,
2914                                    uint32_t update_version,
2915                                    uint32_t current_usn,
2916                                    uint32_t update_usn,
2917                                    NTTIME current_change_time,
2918                                    NTTIME update_change_time)
2919 {
2920         if (GUID_compare(update_invocation_id, current_invocation_id) == 0) {
2921                 if (update_usn != current_usn) {
2922                         return update_usn >= current_usn;
2923                 }
2924         }
2925         if (update_version != current_version) {
2926                 return update_version >= current_version;
2927         }
2928         if (update_change_time != current_change_time) {
2929                 return update_change_time >= current_change_time;
2930         }
2931         return GUID_compare(update_invocation_id, current_invocation_id) >= 0;
2932 }
2933
2934 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2935                                                   struct replPropertyMetaData1 *new_m)
2936 {
2937         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2938                                       &new_m->originating_invocation_id,
2939                                       cur_m->version,
2940                                       new_m->version,
2941                                       cur_m->originating_usn,
2942                                       new_m->originating_usn,
2943                                       cur_m->originating_change_time,
2944                                       new_m->originating_change_time);
2945 }
2946
2947 static struct replPropertyMetaData1 *
2948 replmd_replPropertyMetaData1_find_attid(struct replPropertyMetaDataBlob *md_blob,
2949                                         enum drsuapi_DsAttributeId attid)
2950 {
2951         uint32_t i;
2952         struct replPropertyMetaDataCtr1 *rpmd_ctr = &md_blob->ctr.ctr1;
2953
2954         for (i = 0; i < rpmd_ctr->count; i++) {
2955                 if (rpmd_ctr->array[i].attid == attid) {
2956                         return &rpmd_ctr->array[i];
2957                 }
2958         }
2959         return NULL;
2960 }
2961
2962
2963 /*
2964   handle renames that come in over DRS replication
2965  */
2966 static int replmd_replicated_handle_rename(struct replmd_replicated_request *ar,
2967                                            struct ldb_message *msg,
2968                                            struct replPropertyMetaDataBlob *rmd,
2969                                            struct replPropertyMetaDataBlob *omd)
2970 {
2971         struct replPropertyMetaData1 *md_remote;
2972         struct replPropertyMetaData1 *md_local;
2973
2974         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) == 0) {
2975                 /* no rename */
2976                 return LDB_SUCCESS;
2977         }
2978
2979         /* now we need to check for double renames. We could have a
2980          * local rename pending which our replication partner hasn't
2981          * received yet. We choose which one wins by looking at the
2982          * attribute stamps on the two objects, the newer one wins
2983          */
2984         md_remote = replmd_replPropertyMetaData1_find_attid(rmd, DRSUAPI_ATTRIBUTE_name);
2985         md_local  = replmd_replPropertyMetaData1_find_attid(omd, DRSUAPI_ATTRIBUTE_name);
2986         /* if there is no name attribute then we have to assume the
2987            object we've received is in fact newer */
2988         if (!md_remote || !md_local ||
2989             replmd_replPropertyMetaData1_is_newer(md_local, md_remote)) {
2990                 DEBUG(4,("replmd_replicated_request rename %s => %s\n",
2991                          ldb_dn_get_linearized(ar->search_msg->dn),
2992                          ldb_dn_get_linearized(msg->dn)));
2993                 /* pass rename to the next module
2994                  * so it doesn't appear as an originating update */
2995                 return dsdb_module_rename(ar->module,
2996                                           ar->search_msg->dn, msg->dn,
2997                                           DSDB_FLAG_NEXT_MODULE | DSDB_MODIFY_RELAX);
2998         }
2999
3000         /* we're going to keep our old object */
3001         DEBUG(4,(__location__ ": Keeping object %s and rejecting older rename to %s\n",
3002                  ldb_dn_get_linearized(ar->search_msg->dn),
3003                  ldb_dn_get_linearized(msg->dn)));
3004         return LDB_SUCCESS;
3005 }
3006
3007
3008 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
3009 {
3010         struct ldb_context *ldb;
3011         struct ldb_request *change_req;
3012         enum ndr_err_code ndr_err;
3013         struct ldb_message *msg;
3014         struct replPropertyMetaDataBlob *rmd;
3015         struct replPropertyMetaDataBlob omd;
3016         const struct ldb_val *omd_value;
3017         struct replPropertyMetaDataBlob nmd;
3018         struct ldb_val nmd_value;
3019         unsigned int i;
3020         uint32_t j,ni=0;
3021         unsigned int removed_attrs = 0;
3022         int ret;
3023
3024         ldb = ldb_module_get_ctx(ar->module);
3025         msg = ar->objs->objects[ar->index_current].msg;
3026         rmd = ar->objs->objects[ar->index_current].meta_data;
3027         ZERO_STRUCT(omd);
3028         omd.version = 1;
3029
3030         /* find existing meta data */
3031         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
3032         if (omd_value) {
3033                 ndr_err = ndr_pull_struct_blob(omd_value, ar, &omd,
3034                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
3035                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3036                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3037                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3038                 }
3039
3040                 if (omd.version != 1) {
3041                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3042                 }
3043         }
3044
3045         /* handle renames that come in over DRS */
3046         ret = replmd_replicated_handle_rename(ar, msg, rmd, &omd);
3047         if (ret != LDB_SUCCESS) {
3048                 ldb_debug(ldb, LDB_DEBUG_FATAL,
3049                           "replmd_replicated_request rename %s => %s failed - %s\n",
3050                           ldb_dn_get_linearized(ar->search_msg->dn),
3051                           ldb_dn_get_linearized(msg->dn),
3052                           ldb_errstring(ldb));
3053                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
3054         }
3055
3056         ZERO_STRUCT(nmd);
3057         nmd.version = 1;
3058         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
3059         nmd.ctr.ctr1.array = talloc_array(ar,
3060                                           struct replPropertyMetaData1,
3061                                           nmd.ctr.ctr1.count);
3062         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3063
3064         /* first copy the old meta data */
3065         for (i=0; i < omd.ctr.ctr1.count; i++) {
3066                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
3067                 ni++;
3068         }
3069
3070         /* now merge in the new meta data */
3071         for (i=0; i < rmd->ctr.ctr1.count; i++) {
3072                 bool found = false;
3073
3074                 for (j=0; j < ni; j++) {
3075                         bool cmp;
3076
3077                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
3078                                 continue;
3079                         }
3080
3081                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
3082                                                                     &rmd->ctr.ctr1.array[i]);
3083                         if (cmp) {
3084                                 /* replace the entry */
3085                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
3086                                 found = true;
3087                                 break;
3088                         }
3089
3090                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
3091                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
3092                                          msg->elements[i-removed_attrs].name,
3093                                          ldb_dn_get_linearized(msg->dn),
3094                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
3095                         }
3096
3097                         /* we don't want to apply this change so remove the attribute */
3098                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
3099                         removed_attrs++;
3100
3101                         found = true;
3102                         break;
3103                 }
3104
3105                 if (found) continue;
3106
3107                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
3108                 ni++;
3109         }
3110
3111         /*
3112          * finally correct the size of the meta_data array
3113          */
3114         nmd.ctr.ctr1.count = ni;
3115
3116         /*
3117          * the rdn attribute (the alias for the name attribute),
3118          * 'cn' for most objects is the last entry in the meta data array
3119          * we have stored
3120          *
3121          * sort the new meta data array
3122          */
3123         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
3124         if (ret != LDB_SUCCESS) {
3125                 return ret;
3126         }
3127
3128         /*
3129          * check if some replicated attributes left, otherwise skip the ldb_modify() call
3130          */
3131         if (msg->num_elements == 0) {
3132                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
3133                           ar->index_current);
3134
3135                 ar->index_current++;
3136                 return replmd_replicated_apply_next(ar);
3137         }
3138
3139         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
3140                   ar->index_current, msg->num_elements);
3141
3142         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
3143         if (ret != LDB_SUCCESS) {
3144                 return replmd_replicated_request_error(ar, ret);
3145         }
3146
3147         for (i=0; i<ni; i++) {
3148                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
3149         }
3150
3151         /* create the meta data value */
3152         ndr_err = ndr_push_struct_blob(&nmd_value, msg, &nmd,
3153                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
3154         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3155                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3156                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3157         }
3158
3159         /*
3160          * when we know that we'll modify the record, add the whenChanged, uSNChanged
3161          * and replPopertyMetaData attributes
3162          */
3163         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
3164         if (ret != LDB_SUCCESS) {
3165                 return replmd_replicated_request_error(ar, ret);
3166         }
3167         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
3168         if (ret != LDB_SUCCESS) {
3169                 return replmd_replicated_request_error(ar, ret);
3170         }
3171         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
3172         if (ret != LDB_SUCCESS) {
3173                 return replmd_replicated_request_error(ar, ret);
3174         }
3175
3176         replmd_ldb_message_sort(msg, ar->schema);
3177
3178         /* we want to replace the old values */
3179         for (i=0; i < msg->num_elements; i++) {
3180                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
3181         }
3182
3183         if (DEBUGLVL(4)) {
3184                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3185                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
3186                 talloc_free(s);
3187         }
3188
3189         ret = ldb_build_mod_req(&change_req,
3190                                 ldb,
3191                                 ar,
3192                                 msg,
3193                                 ar->controls,
3194                                 ar,
3195                                 replmd_op_callback,
3196                                 ar->req);
3197         LDB_REQ_SET_LOCATION(change_req);
3198         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3199
3200         return ldb_next_request(ar->module, change_req);
3201 }
3202
3203 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
3204                                                    struct ldb_reply *ares)
3205 {
3206         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3207                                                struct replmd_replicated_request);
3208         int ret;
3209
3210         if (!ares) {
3211                 return ldb_module_done(ar->req, NULL, NULL,
3212                                         LDB_ERR_OPERATIONS_ERROR);
3213         }
3214         if (ares->error != LDB_SUCCESS &&
3215             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3216                 return ldb_module_done(ar->req, ares->controls,
3217                                         ares->response, ares->error);
3218         }
3219
3220         switch (ares->type) {
3221         case LDB_REPLY_ENTRY:
3222                 ar->search_msg = talloc_steal(ar, ares->message);
3223                 break;
3224
3225         case LDB_REPLY_REFERRAL:
3226                 /* we ignore referrals */
3227                 break;
3228
3229         case LDB_REPLY_DONE:
3230                 if (ar->search_msg != NULL) {
3231                         ret = replmd_replicated_apply_merge(ar);
3232                 } else {
3233                         ret = replmd_replicated_apply_add(ar);
3234                 }
3235                 if (ret != LDB_SUCCESS) {
3236                         return ldb_module_done(ar->req, NULL, NULL, ret);
3237                 }
3238         }
3239
3240         talloc_free(ares);
3241         return LDB_SUCCESS;
3242 }
3243
3244 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
3245
3246 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
3247 {
3248         struct ldb_context *ldb;
3249         int ret;
3250         char *tmp_str;
3251         char *filter;
3252         struct ldb_request *search_req;
3253         struct ldb_search_options_control *options;
3254
3255         if (ar->index_current >= ar->objs->num_objects) {
3256                 /* done with it, go to next stage */
3257                 return replmd_replicated_uptodate_vector(ar);
3258         }
3259
3260         ldb = ldb_module_get_ctx(ar->module);
3261         ar->search_msg = NULL;
3262
3263         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
3264         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3265
3266         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
3267         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3268         talloc_free(tmp_str);
3269
3270         ret = ldb_build_search_req(&search_req,
3271                                    ldb,
3272                                    ar,
3273                                    NULL,
3274                                    LDB_SCOPE_SUBTREE,
3275                                    filter,
3276                                    NULL,
3277                                    NULL,
3278                                    ar,
3279                                    replmd_replicated_apply_search_callback,
3280                                    ar->req);
3281         LDB_REQ_SET_LOCATION(search_req);
3282
3283         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_RECYCLED_OID,
3284                                       true, NULL);
3285         if (ret != LDB_SUCCESS) {
3286                 return ret;
3287         }
3288
3289         /* we need to cope with cross-partition links, so search for
3290            the GUID over all partitions */
3291         options = talloc(search_req, struct ldb_search_options_control);
3292         if (options == NULL) {
3293                 DEBUG(0, (__location__ ": out of memory\n"));
3294                 return LDB_ERR_OPERATIONS_ERROR;
3295         }
3296         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
3297
3298         ret = ldb_request_add_control(search_req,
3299                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
3300                                       true, options);
3301         if (ret != LDB_SUCCESS) {
3302                 return ret;
3303         }
3304
3305         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3306
3307         return ldb_next_request(ar->module, search_req);
3308 }
3309
3310 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
3311                                                       struct ldb_reply *ares)
3312 {
3313         struct ldb_context *ldb;
3314         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3315                                                struct replmd_replicated_request);
3316         ldb = ldb_module_get_ctx(ar->module);
3317
3318         if (!ares) {
3319                 return ldb_module_done(ar->req, NULL, NULL,
3320                                         LDB_ERR_OPERATIONS_ERROR);
3321         }
3322         if (ares->error != LDB_SUCCESS) {
3323                 return ldb_module_done(ar->req, ares->controls,
3324                                         ares->response, ares->error);
3325         }
3326
3327         if (ares->type != LDB_REPLY_DONE) {
3328                 ldb_set_errstring(ldb, "Invalid reply type\n!");
3329                 return ldb_module_done(ar->req, NULL, NULL,
3330                                         LDB_ERR_OPERATIONS_ERROR);
3331         }
3332
3333         talloc_free(ares);
3334
3335         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3336 }
3337
3338 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3339 {
3340         struct ldb_context *ldb;
3341         struct ldb_request *change_req;
3342         enum ndr_err_code ndr_err;
3343         struct ldb_message *msg;
3344         struct replUpToDateVectorBlob ouv;
3345         const struct ldb_val *ouv_value;
3346         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3347         struct replUpToDateVectorBlob nuv;
3348         struct ldb_val nuv_value;
3349         struct ldb_message_element *nuv_el = NULL;
3350         const struct GUID *our_invocation_id;
3351         struct ldb_message_element *orf_el = NULL;
3352         struct repsFromToBlob nrf;
3353         struct ldb_val *nrf_value = NULL;
3354         struct ldb_message_element *nrf_el = NULL;
3355         unsigned int i;
3356         uint32_t j,ni=0;
3357         bool found = false;
3358         time_t t = time(NULL);
3359         NTTIME now;
3360         int ret;
3361         uint32_t instanceType;
3362
3363         ldb = ldb_module_get_ctx(ar->module);
3364         ruv = ar->objs->uptodateness_vector;
3365         ZERO_STRUCT(ouv);
3366         ouv.version = 2;
3367         ZERO_STRUCT(nuv);
3368         nuv.version = 2;
3369
3370         unix_to_nt_time(&now, t);
3371
3372         instanceType = ldb_msg_find_attr_as_uint(ar->search_msg, "instanceType", 0);
3373         if (! (instanceType & INSTANCE_TYPE_IS_NC_HEAD)) {
3374                 DEBUG(4,(__location__ ": Skipping UDV and repsFrom update as not NC root: %s\n",
3375                          ldb_dn_get_linearized(ar->search_msg->dn)));
3376                 return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3377         }
3378
3379         /*
3380          * first create the new replUpToDateVector
3381          */
3382         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3383         if (ouv_value) {
3384                 ndr_err = ndr_pull_struct_blob(ouv_value, ar, &ouv,
3385                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3386                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3387                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3388                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3389                 }
3390
3391                 if (ouv.version != 2) {
3392                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3393                 }
3394         }
3395
3396         /*
3397          * the new uptodateness vector will at least
3398          * contain 1 entry, one for the source_dsa
3399          *
3400          * plus optional values from our old vector and the one from the source_dsa
3401          */
3402         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3403         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3404         nuv.ctr.ctr2.cursors = talloc_array(ar,
3405                                             struct drsuapi_DsReplicaCursor2,
3406                                             nuv.ctr.ctr2.count);
3407         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3408
3409         /* first copy the old vector */
3410         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3411                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3412                 ni++;
3413         }
3414
3415         /* get our invocation_id if we have one already attached to the ldb */
3416         our_invocation_id = samdb_ntds_invocation_id(ldb);
3417
3418         /* merge in the source_dsa vector is available */
3419         for (i=0; (ruv && i < ruv->count); i++) {
3420                 found = false;
3421
3422                 if (our_invocation_id &&
3423                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3424                                our_invocation_id)) {
3425                         continue;
3426                 }
3427
3428                 for (j=0; j < ni; j++) {
3429                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3430                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3431                                 continue;
3432                         }
3433
3434                         found = true;
3435
3436                         /*
3437                          * we update only the highest_usn and not the latest_sync_success time,
3438                          * because the last success stands for direct replication
3439                          */
3440                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3441                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3442                         }
3443                         break;
3444                 }
3445
3446                 if (found) continue;
3447
3448                 /* if it's not there yet, add it */
3449                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3450                 ni++;
3451         }
3452
3453         /*
3454          * merge in the current highwatermark for the source_dsa
3455          */
3456         found = false;
3457         for (j=0; j < ni; j++) {
3458                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3459                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3460                         continue;
3461                 }
3462
3463                 found = true;
3464
3465                 /*
3466                  * here we update the highest_usn and last_sync_success time
3467                  * because we're directly replicating from the source_dsa
3468                  *
3469                  * and use the tmp_highest_usn because this is what we have just applied
3470                  * to our ldb
3471                  */
3472                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3473                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3474                 break;
3475         }
3476         if (!found) {
3477                 /*
3478                  * here we update the highest_usn and last_sync_success time
3479                  * because we're directly replicating from the source_dsa
3480                  *
3481                  * and use the tmp_highest_usn because this is what we have just applied
3482                  * to our ldb
3483                  */
3484                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3485                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3486                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3487                 ni++;
3488         }
3489
3490         /*
3491          * finally correct the size of the cursors array
3492          */
3493         nuv.ctr.ctr2.count = ni;
3494
3495         /*
3496          * sort the cursors
3497          */
3498         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
3499
3500         /*
3501          * create the change ldb_message
3502          */
3503         msg = ldb_msg_new(ar);
3504         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3505         msg->dn = ar->search_msg->dn;
3506
3507         ndr_err = ndr_push_struct_blob(&nuv_value, msg, &nuv,
3508                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3509         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3510                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3511                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3512         }
3513         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3514         if (ret != LDB_SUCCESS) {
3515                 return replmd_replicated_request_error(ar, ret);
3516         }
3517         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3518
3519         /*
3520          * now create the new repsFrom value from the given repsFromTo1 structure
3521          */
3522         ZERO_STRUCT(nrf);
3523         nrf.version                                     = 1;
3524         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3525         /* and fix some values... */
3526         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3527         nrf.ctr.ctr1.last_success                       = now;
3528         nrf.ctr.ctr1.last_attempt                       = now;
3529         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3530         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3531
3532         /*
3533          * first see if we already have a repsFrom value for the current source dsa
3534          * if so we'll later replace this value
3535          */
3536         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3537         if (orf_el) {
3538                 for (i=0; i < orf_el->num_values; i++) {
3539                         struct repsFromToBlob *trf;
3540
3541                         trf = talloc(ar, struct repsFromToBlob);
3542                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3543
3544                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, trf,
3545                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3546                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3547                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3548                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3549                         }
3550
3551                         if (trf->version != 1) {
3552                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3553                         }
3554
3555                         /*
3556                          * we compare the source dsa objectGUID not the invocation_id
3557                          * because we want only one repsFrom value per source dsa
3558                          * and when the invocation_id of the source dsa has changed we don't need
3559                          * the old repsFrom with the old invocation_id
3560                          */
3561                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3562                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3563                                 talloc_free(trf);
3564                                 continue;
3565                         }
3566
3567                         talloc_free(trf);
3568                         nrf_value = &orf_el->values[i];
3569                         break;
3570                 }
3571
3572                 /*
3573                  * copy over all old values to the new ldb_message
3574                  */
3575                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3576                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3577                 *nrf_el = *orf_el;
3578         }
3579
3580         /*
3581          * if we haven't found an old repsFrom value for the current source dsa
3582          * we'll add a new value
3583          */
3584         if (!nrf_value) {
3585                 struct ldb_val zero_value;
3586                 ZERO_STRUCT(zero_value);
3587                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3588                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3589
3590                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3591         }
3592
3593         /* we now fill the value which is already attached to ldb_message */
3594         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3595                                        &nrf,
3596                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3597         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3598                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3599                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3600         }
3601
3602         /*
3603          * the ldb_message_element for the attribute, has all the old values and the new one
3604          * so we'll replace the whole attribute with all values
3605          */
3606         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3607
3608         if (DEBUGLVL(4)) {
3609                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3610                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3611                 talloc_free(s);
3612         }
3613
3614         /* prepare the ldb_modify() request */
3615         ret = ldb_build_mod_req(&change_req,
3616                                 ldb,
3617                                 ar,
3618                                 msg,
3619                                 ar->controls,
3620                                 ar,
3621                                 replmd_replicated_uptodate_modify_callback,
3622                                 ar->req);
3623         LDB_REQ_SET_LOCATION(change_req);
3624         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3625
3626         return ldb_next_request(ar->module, change_req);
3627 }
3628
3629 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3630                                                       struct ldb_reply *ares)
3631 {
3632         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3633                                                struct replmd_replicated_request);
3634         int ret;
3635
3636         if (!ares) {
3637                 return ldb_module_done(ar->req, NULL, NULL,
3638                                         LDB_ERR_OPERATIONS_ERROR);
3639         }
3640         if (ares->error != LDB_SUCCESS &&
3641             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3642                 return ldb_module_done(ar->req, ares->controls,
3643                                         ares->response, ares->error);
3644         }
3645
3646         switch (ares->type) {
3647         case LDB_REPLY_ENTRY:
3648                 ar->search_msg = talloc_steal(ar, ares->message);
3649                 break;
3650
3651         case LDB_REPLY_REFERRAL:
3652                 /* we ignore referrals */
3653                 break;
3654
3655         case LDB_REPLY_DONE:
3656                 if (ar->search_msg == NULL) {
3657                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3658                 } else {
3659                         ret = replmd_replicated_uptodate_modify(ar);
3660                 }
3661                 if (ret != LDB_SUCCESS) {
3662                         return ldb_module_done(ar->req, NULL, NULL, ret);
3663                 }
3664         }
3665
3666         talloc_free(ares);
3667         return LDB_SUCCESS;
3668 }
3669
3670
3671 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3672 {
3673         struct ldb_context *ldb;
3674         int ret;
3675         static const char *attrs[] = {
3676                 "replUpToDateVector",
3677                 "repsFrom",
3678                 "instanceType",
3679                 NULL
3680         };
3681         struct ldb_request *search_req;
3682
3683         ldb = ldb_module_get_ctx(ar->module);
3684         ar->search_msg = NULL;
3685
3686         ret = ldb_build_search_req(&search_req,
3687                                    ldb,
3688                                    ar,
3689                                    ar->objs->partition_dn,
3690                                    LDB_SCOPE_BASE,
3691                                    "(objectClass=*)",
3692                                    attrs,
3693                                    NULL,
3694                                    ar,
3695                                    replmd_replicated_uptodate_search_callback,
3696                                    ar->req);
3697         LDB_REQ_SET_LOCATION(search_req);
3698         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3699
3700         return ldb_next_request(ar->module, search_req);
3701 }
3702
3703
3704
3705 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3706 {
3707         struct ldb_context *ldb;
3708         struct dsdb_extended_replicated_objects *objs;
3709         struct replmd_replicated_request *ar;
3710         struct ldb_control **ctrls;
3711         int ret;
3712         uint32_t i;
3713         struct replmd_private *replmd_private =
3714                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3715
3716         ldb = ldb_module_get_ctx(module);
3717
3718         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3719
3720         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3721         if (!objs) {
3722                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3723                 return LDB_ERR_PROTOCOL_ERROR;
3724         }
3725
3726         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3727                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3728                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3729                 return LDB_ERR_PROTOCOL_ERROR;
3730         }
3731
3732         ar = replmd_ctx_init(module, req);
3733         if (!ar)
3734                 return LDB_ERR_OPERATIONS_ERROR;
3735
3736         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3737         ar->apply_mode = true;
3738         ar->objs = objs;
3739         ar->schema = dsdb_get_schema(ldb, ar);
3740         if (!ar->schema) {
3741                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3742                 talloc_free(ar);
3743                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3744                 return LDB_ERR_CONSTRAINT_VIOLATION;
3745         }
3746
3747         ctrls = req->controls;
3748
3749         if (req->controls) {
3750                 req->controls = talloc_memdup(ar, req->controls,
3751                                               talloc_get_size(req->controls));
3752                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3753         }
3754
3755         /* This allows layers further down to know if a change came in over replication */
3756         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3757         if (ret != LDB_SUCCESS) {
3758                 return ret;
3759         }
3760
3761         /* If this change contained linked attributes in the body
3762          * (rather than in the links section) we need to update
3763          * backlinks in linked_attributes */
3764         ret = ldb_request_add_control(req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
3765         if (ret != LDB_SUCCESS) {
3766                 return ret;
3767         }
3768
3769         ar->controls = req->controls;
3770         req->controls = ctrls;
3771
3772         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3773
3774         /* save away the linked attributes for the end of the
3775            transaction */
3776         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3777                 struct la_entry *la_entry;
3778
3779                 if (replmd_private->la_ctx == NULL) {
3780                         replmd_private->la_ctx = talloc_new(replmd_private);
3781                 }
3782                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3783                 if (la_entry == NULL) {
3784                         ldb_oom(ldb);
3785                         return LDB_ERR_OPERATIONS_ERROR;
3786                 }
3787                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3788                 if (la_entry->la == NULL) {
3789                         talloc_free(la_entry);
3790                         ldb_oom(ldb);
3791                         return LDB_ERR_OPERATIONS_ERROR;
3792                 }
3793                 *la_entry->la = ar->objs->linked_attributes[i];
3794
3795                 /* we need to steal the non-scalars so they stay
3796                    around until the end of the transaction */
3797                 talloc_steal(la_entry->la, la_entry->la->identifier);
3798                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3799
3800                 DLIST_ADD(replmd_private->la_list, la_entry);
3801         }
3802
3803         return replmd_replicated_apply_next(ar);
3804 }
3805
3806 /*
3807   process one linked attribute structure
3808  */
3809 static int replmd_process_linked_attribute(struct ldb_module *module,
3810                                            struct la_entry *la_entry)
3811 {
3812         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3813         struct ldb_context *ldb = ldb_module_get_ctx(module);
3814         struct ldb_message *msg;
3815         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3816         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
3817         int ret;
3818         const struct dsdb_attribute *attr;
3819         struct dsdb_dn *dsdb_dn;
3820         uint64_t seq_num = 0;
3821         struct ldb_message_element *old_el;
3822         WERROR status;
3823         time_t t = time(NULL);
3824         struct ldb_result *res;
3825         const char *attrs[2];
3826         struct parsed_dn *pdn_list, *pdn;
3827         struct GUID guid = GUID_zero();
3828         NTSTATUS ntstatus;
3829         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3830         const struct GUID *our_invocation_id;
3831
3832 /*
3833 linked_attributes[0]:
3834      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3835         identifier               : *
3836             identifier: struct drsuapi_DsReplicaObjectIdentifier
3837                 __ndr_size               : 0x0000003a (58)
3838                 __ndr_size_sid           : 0x00000000 (0)
3839                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3840                 sid                      : S-0-0
3841                 __ndr_size_dn            : 0x00000000 (0)
3842                 dn                       : ''
3843         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3844         value: struct drsuapi_DsAttributeValue
3845             __ndr_size               : 0x0000007e (126)
3846             blob                     : *
3847                 blob                     : DATA_BLOB length=126
3848         flags                    : 0x00000001 (1)
3849                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3850         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3851         meta_data: struct drsuapi_DsReplicaMetaData
3852             version                  : 0x00000015 (21)
3853             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3854             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3855             originating_usn          : 0x000000000001e19c (123292)
3856
3857 (for cases where the link is to a normal DN)
3858      &target: struct drsuapi_DsReplicaObjectIdentifier3
3859         __ndr_size               : 0x0000007e (126)
3860         __ndr_size_sid           : 0x0000001c (28)
3861         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3862         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3863         __ndr_size_dn            : 0x00000022 (34)
3864         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3865  */
3866
3867         /* find the attribute being modified */
3868         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3869         if (attr == NULL) {
3870                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3871                 talloc_free(tmp_ctx);
3872                 return LDB_ERR_OPERATIONS_ERROR;
3873         }
3874
3875         attrs[0] = attr->lDAPDisplayName;
3876         attrs[1] = NULL;
3877
3878         /* get the existing message from the db for the object with
3879            this GUID, returning attribute being modified. We will then
3880            use this msg as the basis for a modify call */
3881         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3882                                  DSDB_FLAG_NEXT_MODULE |
3883                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3884                                  DSDB_SEARCH_SHOW_RECYCLED |
3885                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3886                                  DSDB_SEARCH_REVEAL_INTERNALS,
3887                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3888         if (ret != LDB_SUCCESS) {
3889                 talloc_free(tmp_ctx);
3890                 return ret;
3891         }
3892         if (res->count != 1) {
3893                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3894                                        GUID_string(tmp_ctx, &la->identifier->guid));
3895                 talloc_free(tmp_ctx);
3896                 return LDB_ERR_NO_SUCH_OBJECT;
3897         }
3898         msg = res->msgs[0];
3899
3900         if (msg->num_elements == 0) {
3901                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3902                 if (ret != LDB_SUCCESS) {
3903                         ldb_module_oom(module);
3904                         talloc_free(tmp_ctx);
3905                         return LDB_ERR_OPERATIONS_ERROR;
3906                 }
3907         } else {
3908                 old_el = &msg->elements[0];
3909                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3910         }
3911
3912         /* parse the existing links */
3913         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3914         if (ret != LDB_SUCCESS) {
3915                 talloc_free(tmp_ctx);
3916                 return ret;
3917         }
3918
3919         /* get our invocationId */
3920         our_invocation_id = samdb_ntds_invocation_id(ldb);
3921         if (!our_invocation_id) {
3922                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3923                 talloc_free(tmp_ctx);
3924                 return LDB_ERR_OPERATIONS_ERROR;
3925         }
3926
3927         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
3928         if (ret != LDB_SUCCESS) {
3929                 talloc_free(tmp_ctx);
3930                 return ret;
3931         }
3932
3933         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3934         if (!W_ERROR_IS_OK(status)) {
3935                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3936                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3937                 return LDB_ERR_OPERATIONS_ERROR;
3938         }
3939
3940         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3941         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3942                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3943                                        old_el->name,
3944                                        ldb_dn_get_linearized(dsdb_dn->dn),
3945                                        ldb_dn_get_linearized(msg->dn));
3946                 return LDB_ERR_OPERATIONS_ERROR;
3947         }
3948
3949         /* re-resolve the DN by GUID, as the DRS server may give us an
3950            old DN value */
3951         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
3952         if (ret != LDB_SUCCESS) {
3953                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s",
3954                          GUID_string(tmp_ctx, &guid),
3955                          ldb_dn_get_linearized(dsdb_dn->dn)));
3956         }
3957
3958         /* see if this link already exists */
3959         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3960         if (pdn != NULL) {
3961                 /* see if this update is newer than what we have already */
3962                 struct GUID invocation_id = GUID_zero();
3963                 uint32_t version = 0;
3964                 uint32_t originating_usn = 0;
3965                 NTTIME change_time = 0;
3966                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3967
3968                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3969                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3970                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &originating_usn, "RMD_ORIGINATING_USN");
3971                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3972
3973                 if (!replmd_update_is_newer(&invocation_id,
3974                                             &la->meta_data.originating_invocation_id,
3975                                             version,
3976                                             la->meta_data.version,
3977                                             originating_usn,
3978                                             la->meta_data.originating_usn,
3979                                             change_time,
3980                                             la->meta_data.originating_change_time)) {
3981                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3982                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3983                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3984                         talloc_free(tmp_ctx);
3985                         return LDB_SUCCESS;
3986                 }
3987
3988                 /* get a seq_num for this change */
3989                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3990                 if (ret != LDB_SUCCESS) {
3991                         talloc_free(tmp_ctx);
3992                         return ret;
3993                 }
3994
3995                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
3996                         /* remove the existing backlink */
3997                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3998                         if (ret != LDB_SUCCESS) {
3999                                 talloc_free(tmp_ctx);
4000                                 return ret;
4001                         }
4002                 }
4003
4004                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
4005                                            &la->meta_data.originating_invocation_id,
4006                                            la->meta_data.originating_usn, seq_num,
4007                                            la->meta_data.originating_change_time,
4008                                            la->meta_data.version,
4009                                            !active);
4010                 if (ret != LDB_SUCCESS) {
4011                         talloc_free(tmp_ctx);
4012                         return ret;
4013                 }
4014
4015                 if (active) {
4016                         /* add the new backlink */
4017                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
4018                         if (ret != LDB_SUCCESS) {
4019                                 talloc_free(tmp_ctx);
4020                                 return ret;
4021                         }
4022                 }
4023         } else {
4024                 /* get a seq_num for this change */
4025                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
4026                 if (ret != LDB_SUCCESS) {
4027                         talloc_free(tmp_ctx);
4028                         return ret;
4029                 }
4030
4031                 old_el->values = talloc_realloc(msg->elements, old_el->values,
4032                                                 struct ldb_val, old_el->num_values+1);
4033                 if (!old_el->values) {
4034                         ldb_module_oom(module);
4035                         return LDB_ERR_OPERATIONS_ERROR;
4036                 }
4037                 old_el->num_values++;
4038
4039                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
4040                                           &la->meta_data.originating_invocation_id,
4041                                           la->meta_data.originating_usn, seq_num,
4042                                           la->meta_data.originating_change_time,
4043                                           la->meta_data.version,
4044                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
4045                 if (ret != LDB_SUCCESS) {
4046                         talloc_free(tmp_ctx);
4047                         return ret;
4048                 }
4049
4050                 if (active) {
4051                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
4052                                                   true, attr, false);
4053                         if (ret != LDB_SUCCESS) {
4054                                 talloc_free(tmp_ctx);
4055                                 return ret;
4056                         }
4057                 }
4058         }
4059
4060         /* we only change whenChanged and uSNChanged if the seq_num
4061            has changed */
4062         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
4063                 talloc_free(tmp_ctx);
4064                 return ldb_operr(ldb);
4065         }
4066
4067         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
4068                 talloc_free(tmp_ctx);
4069                 return ldb_operr(ldb);
4070         }
4071
4072         old_el = ldb_msg_find_element(msg, attr->lDAPDisplayName);
4073         if (old_el == NULL) {
4074                 talloc_free(tmp_ctx);
4075                 return ldb_operr(ldb);
4076         }
4077
4078         ret = dsdb_check_single_valued_link(attr, old_el);
4079         if (ret != LDB_SUCCESS) {
4080                 talloc_free(tmp_ctx);
4081                 return ret;
4082         }
4083
4084         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE | DSDB_MODIFY_RELAX);
4085         if (ret != LDB_SUCCESS) {
4086                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
4087                           ldb_errstring(ldb),
4088                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
4089                 talloc_free(tmp_ctx);
4090                 return ret;
4091         }
4092
4093         talloc_free(tmp_ctx);
4094
4095         return ret;
4096 }
4097
4098 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
4099 {
4100         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
4101                 return replmd_extended_replicated_objects(module, req);
4102         }
4103
4104         return ldb_next_request(module, req);
4105 }
4106
4107
4108 /*
4109   we hook into the transaction operations to allow us to
4110   perform the linked attribute updates at the end of the whole
4111   transaction. This allows a forward linked attribute to be created
4112   before the object is created. During a vampire, w2k8 sends us linked
4113   attributes before the objects they are part of.
4114  */
4115 static int replmd_start_transaction(struct ldb_module *module)
4116 {
4117         /* create our private structure for this transaction */
4118         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
4119                                                                 struct replmd_private);
4120         replmd_txn_cleanup(replmd_private);
4121
4122         /* free any leftover mod_usn records from cancelled
4123            transactions */
4124         while (replmd_private->ncs) {
4125                 struct nc_entry *e = replmd_private->ncs;
4126                 DLIST_REMOVE(replmd_private->ncs, e);
4127                 talloc_free(e);
4128         }
4129
4130         return ldb_next_start_trans(module);
4131 }
4132
4133 /*
4134   on prepare commit we loop over our queued la_context structures and
4135   apply each of them
4136  */
4137 static int replmd_prepare_commit(struct ldb_module *module)
4138 {
4139         struct replmd_private *replmd_private =
4140                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4141         struct la_entry *la, *prev;
4142         struct la_backlink *bl;
4143         int ret;
4144
4145         /* walk the list backwards, to do the first entry first, as we
4146          * added the entries with DLIST_ADD() which puts them at the
4147          * start of the list */
4148         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
4149                 prev = DLIST_PREV(la);
4150                 DLIST_REMOVE(replmd_private->la_list, la);
4151                 ret = replmd_process_linked_attribute(module, la);
4152                 if (ret != LDB_SUCCESS) {
4153                         replmd_txn_cleanup(replmd_private);
4154                         return ret;
4155                 }
4156         }
4157
4158         /* process our backlink list, creating and deleting backlinks
4159            as necessary */
4160         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
4161                 ret = replmd_process_backlink(module, bl);
4162                 if (ret != LDB_SUCCESS) {
4163                         replmd_txn_cleanup(replmd_private);
4164                         return ret;
4165                 }
4166         }
4167
4168         replmd_txn_cleanup(replmd_private);
4169
4170         /* possibly change @REPLCHANGED */
4171         ret = replmd_notify_store(module);
4172         if (ret != LDB_SUCCESS) {
4173                 return ret;
4174         }
4175
4176         return ldb_next_prepare_commit(module);
4177 }
4178
4179 static int replmd_del_transaction(struct ldb_module *module)
4180 {
4181         struct replmd_private *replmd_private =
4182                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4183         replmd_txn_cleanup(replmd_private);
4184
4185         return ldb_next_del_trans(module);
4186 }
4187
4188
4189 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
4190         .name          = "repl_meta_data",
4191         .init_context      = replmd_init,
4192         .add               = replmd_add,
4193         .modify            = replmd_modify,
4194         .rename            = replmd_rename,
4195         .del               = replmd_delete,
4196         .extended          = replmd_extended,
4197         .start_transaction = replmd_start_transaction,
4198         .prepare_commit    = replmd_prepare_commit,
4199         .del_transaction   = replmd_del_transaction,
4200 };