source4/dsdb/samdb/ldb_modules/repl_meta_data.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2004-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  *  Name: ldb
  25  *
  26  *  Component: ldb repl_meta_data module
  27  *
  28  *  Description: - add a unique objectGUID onto every new record,
  29  *               - handle whenCreated, whenChanged timestamps
  30  *               - handle uSNCreated, uSNChanged numbers
  31  *               - handle replPropertyMetaData attribute
  32  *
  33  *  Author: Simo Sorce
  34  *  Author: Stefan Metzmacher
  35  */
  36
  37 #include "includes.h"
  38 #include "ldb_module.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "dsdb/common/proto.h"
  41 #include "../libds/common/flags.h"
  42 #include "librpc/gen_ndr/ndr_misc.h"
  43 #include "librpc/gen_ndr/ndr_drsuapi.h"
  44 #include "librpc/gen_ndr/ndr_drsblobs.h"
  45 #include "param/param.h"
  46 #include "libcli/security/dom_sid.h"
  47 #include "lib/util/dlinklist.h"
  48 #include "dsdb/samdb/ldb_modules/util.h"
  49 #include "lib/util/binsearch.h"
  50 #include "libcli/security/security.h"
  51 #include "lib/util/tsort.h"
  52
  53 #define W2K3_LINKED_ATTRIBUTES 1
  54
  55 struct replmd_private {
  56         TALLOC_CTX *la_ctx;
  57         struct la_entry *la_list;
  58         TALLOC_CTX *bl_ctx;
  59         struct la_backlink *la_backlinks;
  60         struct nc_entry {
  61                 struct nc_entry *prev, *next;
  62                 struct ldb_dn *dn;
  63                 uint64_t mod_usn;
  64                 uint64_t mod_usn_urgent;
  65         } *ncs;
  66 };
  67
  68 struct la_entry {
  69         struct la_entry *next, *prev;
  70         struct drsuapi_DsReplicaLinkedAttribute *la;
  71 };
  72
  73 struct replmd_replicated_request {
  74         struct ldb_module *module;
  75         struct ldb_request *req;
  76
  77         const struct dsdb_schema *schema;
  78
  79         /* the controls we pass down */
  80         struct ldb_control **controls;
  81
  82         /* details for the mode where we apply a bunch of inbound replication meessages */
  83         bool apply_mode;
  84         uint32_t index_current;
  85         struct dsdb_extended_replicated_objects *objs;
  86
  87         struct ldb_message *search_msg;
  88
  89         uint64_t seq_num;
  90         bool is_urgent;
  91 };
  92
  93 enum urgent_situation {
  94         REPL_URGENT_ON_CREATE = 1,
  95         REPL_URGENT_ON_UPDATE = 2,
  96         REPL_URGENT_ON_DELETE = 4
  97 };
  98
  99
 100 static const struct {
 101         const char *update_name;
 102         enum urgent_situation repl_situation;
 103 } urgent_objects[] = {
 104                 {"nTDSDSA", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 105                 {"crossRef", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 106                 {"attributeSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 107                 {"classSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 108                 {"secret", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 109                 {"rIDManager", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 110                 {NULL, 0}
 111 };
 112
 113 /* Attributes looked for when updating or deleting, to check for a urgent replication needed */
 114 static const char *urgent_attrs[] = {
 115                 "lockoutTime",
 116                 "pwdLastSet",
 117                 "userAccountControl",
 118                 NULL
 119 };
 120
 121
 122 static bool replmd_check_urgent_objectclass(const struct ldb_message_element *objectclass_el,
 123                                         enum urgent_situation situation)
 124 {
 125         int i, j;
 126         for (i=0; urgent_objects[i].update_name; i++) {
 127
 128                 if ((situation & urgent_objects[i].repl_situation) == 0) {
 129                         continue;
 130                 }
 131
 132                 for (j=0; j<objectclass_el->num_values; j++) {
 133                         const struct ldb_val *v = &objectclass_el->values[j];
 134                         if (ldb_attr_cmp((const char *)v->data, urgent_objects[i].update_name) == 0) {
 135                                 return true;
 136                         }
 137                 }
 138         }
 139         return false;
 140 }
 141
 142 static bool replmd_check_urgent_attribute(const struct ldb_message_element *el)
 143 {
 144         if (ldb_attr_in_list(urgent_attrs, el->name)) {
 145                 return true;
 146         }
 147         return false;
 148 }
 149
 150
 151 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
 152
 153 /*
 154   initialise the module
 155   allocate the private structure and build the list
 156   of partition DNs for use by replmd_notify()
 157  */
 158 static int replmd_init(struct ldb_module *module)
 159 {
 160         struct replmd_private *replmd_private;
 161         struct ldb_context *ldb = ldb_module_get_ctx(module);
 162
 163         replmd_private = talloc_zero(module, struct replmd_private);
 164         if (replmd_private == NULL) {
 165                 ldb_oom(ldb);
 166                 return LDB_ERR_OPERATIONS_ERROR;
 167         }
 168         ldb_module_set_private(module, replmd_private);
 169
 170         return ldb_next_init(module);
 171 }
 172
 173 /*
 174   cleanup our per-transaction contexts
 175  */
 176 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 177 {
 178         talloc_free(replmd_private->la_ctx);
 179         replmd_private->la_list = NULL;
 180         replmd_private->la_ctx = NULL;
 181
 182         talloc_free(replmd_private->bl_ctx);
 183         replmd_private->la_backlinks = NULL;
 184         replmd_private->bl_ctx = NULL;
 185 }
 186
 187
 188 struct la_backlink {
 189         struct la_backlink *next, *prev;
 190         const char *attr_name;
 191         struct GUID forward_guid, target_guid;
 192         bool active;
 193 };
 194
 195 /*
 196   process a backlinks we accumulated during a transaction, adding and
 197   deleting the backlinks from the target objects
 198  */
 199 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl)
 200 {
 201         struct ldb_dn *target_dn, *source_dn;
 202         int ret;
 203         struct ldb_context *ldb = ldb_module_get_ctx(module);
 204         struct ldb_message *msg;
 205         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 206         char *dn_string;
 207
 208         /*
 209           - find DN of target
 210           - find DN of source
 211           - construct ldb_message
 212               - either an add or a delete
 213          */
 214         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn);
 215         if (ret != LDB_SUCCESS) {
 216                 DEBUG(2,(__location__ ": WARNING: Failed to find target DN for linked attribute with GUID %s\n",
 217                          GUID_string(bl, &bl->target_guid)));
 218                 return LDB_SUCCESS;
 219         }
 220
 221         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
 222         if (ret != LDB_SUCCESS) {
 223                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 224                                        GUID_string(bl, &bl->forward_guid));
 225                 talloc_free(tmp_ctx);
 226                 return ret;
 227         }
 228
 229         msg = ldb_msg_new(tmp_ctx);
 230         if (msg == NULL) {
 231                 ldb_module_oom(module);
 232                 talloc_free(tmp_ctx);
 233                 return LDB_ERR_OPERATIONS_ERROR;
 234         }
 235
 236         /* construct a ldb_message for adding/deleting the backlink */
 237         msg->dn = target_dn;
 238         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 239         if (!dn_string) {
 240                 ldb_module_oom(module);
 241                 talloc_free(tmp_ctx);
 242                 return LDB_ERR_OPERATIONS_ERROR;
 243         }
 244         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 245         if (ret != LDB_SUCCESS) {
 246                 talloc_free(tmp_ctx);
 247                 return ret;
 248         }
 249         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 250
 251         ret = dsdb_module_modify(module, msg, 0);
 252         if (ret != LDB_SUCCESS) {
 253                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 254                                        bl->active?"add":"remove",
 255                                        ldb_dn_get_linearized(source_dn),
 256                                        ldb_dn_get_linearized(target_dn),
 257                                        ldb_errstring(ldb));
 258                 talloc_free(tmp_ctx);
 259                 return ret;
 260         }
 261         talloc_free(tmp_ctx);
 262         return ret;
 263 }
 264
 265 /*
 266   add a backlink to the list of backlinks to add/delete in the prepare
 267   commit
 268  */
 269 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 270                                struct GUID *forward_guid, struct GUID *target_guid,
 271                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 272 {
 273         const struct dsdb_attribute *target_attr;
 274         struct la_backlink *bl;
 275         struct replmd_private *replmd_private =
 276                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 277
 278         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 279         if (!target_attr) {
 280                 /*
 281                  * windows 2003 has a broken schema where the
 282                  * definition of msDS-IsDomainFor is missing (which is
 283                  * supposed to be the backlink of the
 284                  * msDS-HasDomainNCs attribute
 285                  */
 286                 return LDB_SUCCESS;
 287         }
 288
 289         /* see if its already in the list */
 290         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 291                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 292                     GUID_equal(target_guid, &bl->target_guid) &&
 293                     (target_attr->lDAPDisplayName == bl->attr_name ||
 294                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 295                         break;
 296                 }
 297         }
 298
 299         if (bl) {
 300                 /* we found an existing one */
 301                 if (bl->active == active) {
 302                         return LDB_SUCCESS;
 303                 }
 304                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 305                 talloc_free(bl);
 306                 return LDB_SUCCESS;
 307         }
 308
 309         if (replmd_private->bl_ctx == NULL) {
 310                 replmd_private->bl_ctx = talloc_new(replmd_private);
 311                 if (replmd_private->bl_ctx == NULL) {
 312                         ldb_module_oom(module);
 313                         return LDB_ERR_OPERATIONS_ERROR;
 314                 }
 315         }
 316
 317         /* its a new one */
 318         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 319         if (bl == NULL) {
 320                 ldb_module_oom(module);
 321                 return LDB_ERR_OPERATIONS_ERROR;
 322         }
 323
 324         /* Ensure the schema does not go away before the bl->attr_name is used */
 325         if (!talloc_reference(bl, schema)) {
 326                 talloc_free(bl);
 327                 ldb_module_oom(module);
 328                 return LDB_ERR_OPERATIONS_ERROR;
 329         }
 330
 331         bl->attr_name = target_attr->lDAPDisplayName;
 332         bl->forward_guid = *forward_guid;
 333         bl->target_guid = *target_guid;
 334         bl->active = active;
 335
 336         /* the caller may ask for this backlink to be processed
 337            immediately */
 338         if (immediate) {
 339                 int ret = replmd_process_backlink(module, bl);
 340                 talloc_free(bl);
 341                 return ret;
 342         }
 343
 344         DLIST_ADD(replmd_private->la_backlinks, bl);
 345
 346         return LDB_SUCCESS;
 347 }
 348
 349
 350 /*
 351  * Callback for most write operations in this module:
 352  *
 353  * notify the repl task that a object has changed. The notifies are
 354  * gathered up in the replmd_private structure then written to the
 355  * @REPLCHANGED object in each partition during the prepare_commit
 356  */
 357 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 358 {
 359         int ret;
 360         struct replmd_replicated_request *ac =
 361                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 362         struct replmd_private *replmd_private =
 363                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 364         struct nc_entry *modified_partition;
 365         struct ldb_control *partition_ctrl;
 366         const struct dsdb_control_current_partition *partition;
 367
 368         struct ldb_control **controls;
 369
 370         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 371
 372         /* Remove the 'partition' control from what we pass up the chain */
 373         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 374
 375         if (ares->error != LDB_SUCCESS) {
 376                 return ldb_module_done(ac->req, controls,
 377                                         ares->response, ares->error);
 378         }
 379
 380         if (ares->type != LDB_REPLY_DONE) {
 381                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 382                 return ldb_module_done(ac->req, NULL,
 383                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 384         }
 385
 386         if (!partition_ctrl) {
 387                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 388                 return ldb_module_done(ac->req, NULL,
 389                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 390         }
 391
 392         partition = talloc_get_type_abort(partition_ctrl->data,
 393                                     struct dsdb_control_current_partition);
 394
 395         if (ac->seq_num > 0) {
 396                 for (modified_partition = replmd_private->ncs; modified_partition;
 397                      modified_partition = modified_partition->next) {
 398                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 399                                 break;
 400                         }
 401                 }
 402
 403                 if (modified_partition == NULL) {
 404                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 405                         if (!modified_partition) {
 406                                 ldb_oom(ldb_module_get_ctx(ac->module));
 407                                 return ldb_module_done(ac->req, NULL,
 408                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 409                         }
 410                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 411                         if (!modified_partition->dn) {
 412                                 ldb_oom(ldb_module_get_ctx(ac->module));
 413                                 return ldb_module_done(ac->req, NULL,
 414                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 415                         }
 416                         DLIST_ADD(replmd_private->ncs, modified_partition);
 417                 }
 418
 419                 if (ac->seq_num > modified_partition->mod_usn) {
 420                         modified_partition->mod_usn = ac->seq_num;
 421                         if (ac->is_urgent) {
 422                                 modified_partition->mod_usn_urgent = ac->seq_num;
 423                         }
 424                 }
 425         }
 426
 427         if (ac->apply_mode) {
 428                 talloc_free(ares);
 429                 ac->index_current++;
 430
 431                 ret = replmd_replicated_apply_next(ac);
 432                 if (ret != LDB_SUCCESS) {
 433                         return ldb_module_done(ac->req, NULL, NULL, ret);
 434                 }
 435                 return ret;
 436         } else {
 437                 /* free the partition control container here, for the
 438                  * common path.  Other cases will have it cleaned up
 439                  * eventually with the ares */
 440                 talloc_free(partition_ctrl);
 441                 return ldb_module_done(ac->req,
 442                                        controls_except_specified(controls, ares, partition_ctrl),
 443                                        ares->response, LDB_SUCCESS);
 444         }
 445 }
 446
 447
 448 /*
 449  * update a @REPLCHANGED record in each partition if there have been
 450  * any writes of replicated data in the partition
 451  */
 452 static int replmd_notify_store(struct ldb_module *module)
 453 {
 454         struct replmd_private *replmd_private =
 455                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 456
 457         while (replmd_private->ncs) {
 458                 int ret;
 459                 struct nc_entry *modified_partition = replmd_private->ncs;
 460
 461                 ret = dsdb_module_save_partition_usn(module, modified_partition->dn,
 462                                                      modified_partition->mod_usn,
 463                                                      modified_partition->mod_usn_urgent);
 464                 if (ret != LDB_SUCCESS) {
 465                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 466                                  ldb_dn_get_linearized(modified_partition->dn)));
 467                         return ret;
 468                 }
 469                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 470                 talloc_free(modified_partition);
 471         }
 472
 473         return LDB_SUCCESS;
 474 }
 475
 476
 477 /*
 478   created a replmd_replicated_request context
 479  */
 480 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 481                                                          struct ldb_request *req)
 482 {
 483         struct ldb_context *ldb;
 484         struct replmd_replicated_request *ac;
 485
 486         ldb = ldb_module_get_ctx(module);
 487
 488         ac = talloc_zero(req, struct replmd_replicated_request);
 489         if (ac == NULL) {
 490                 ldb_oom(ldb);
 491                 return NULL;
 492         }
 493
 494         ac->module = module;
 495         ac->req = req;
 496
 497         ac->schema = dsdb_get_schema(ldb, ac);
 498         if (!ac->schema) {
 499                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 500                               "replmd_modify: no dsdb_schema loaded");
 501                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 502                 return NULL;
 503         }
 504
 505         return ac;
 506 }
 507
 508 /*
 509   add a time element to a record
 510 */
 511 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 512 {
 513         struct ldb_message_element *el;
 514         char *s;
 515
 516         if (ldb_msg_find_element(msg, attr) != NULL) {
 517                 return LDB_SUCCESS;
 518         }
 519
 520         s = ldb_timestring(msg, t);
 521         if (s == NULL) {
 522                 return LDB_ERR_OPERATIONS_ERROR;
 523         }
 524
 525         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 526                 return LDB_ERR_OPERATIONS_ERROR;
 527         }
 528
 529         el = ldb_msg_find_element(msg, attr);
 530         /* always set as replace. This works because on add ops, the flag
 531            is ignored */
 532         el->flags = LDB_FLAG_MOD_REPLACE;
 533
 534         return LDB_SUCCESS;
 535 }
 536
 537 /*
 538   add a uint64_t element to a record
 539 */
 540 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 541 {
 542         struct ldb_message_element *el;
 543
 544         if (ldb_msg_find_element(msg, attr) != NULL) {
 545                 return LDB_SUCCESS;
 546         }
 547
 548         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 549                 return LDB_ERR_OPERATIONS_ERROR;
 550         }
 551
 552         el = ldb_msg_find_element(msg, attr);
 553         /* always set as replace. This works because on add ops, the flag
 554            is ignored */
 555         el->flags = LDB_FLAG_MOD_REPLACE;
 556
 557         return LDB_SUCCESS;
 558 }
 559
 560 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 561                                                    const struct replPropertyMetaData1 *m2,
 562                                                    const uint32_t *rdn_attid)
 563 {
 564         if (m1->attid == m2->attid) {
 565                 return 0;
 566         }
 567
 568         /*
 569          * the rdn attribute should be at the end!
 570          * so we need to return a value greater than zero
 571          * which means m1 is greater than m2
 572          */
 573         if (m1->attid == *rdn_attid) {
 574                 return 1;
 575         }
 576
 577         /*
 578          * the rdn attribute should be at the end!
 579          * so we need to return a value less than zero
 580          * which means m2 is greater than m1
 581          */
 582         if (m2->attid == *rdn_attid) {
 583                 return -1;
 584         }
 585
 586         return m1->attid > m2->attid ? 1 : -1;
 587 }
 588
 589 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 590                                                 const struct dsdb_schema *schema,
 591                                                 struct ldb_dn *dn)
 592 {
 593         const char *rdn_name;
 594         const struct dsdb_attribute *rdn_sa;
 595
 596         rdn_name = ldb_dn_get_rdn_name(dn);
 597         if (!rdn_name) {
 598                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 599                 return LDB_ERR_OPERATIONS_ERROR;
 600         }
 601
 602         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 603         if (rdn_sa == NULL) {
 604                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 605                 return LDB_ERR_OPERATIONS_ERROR;
 606         }
 607
 608         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 609                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 610
 611         LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
 612
 613         return LDB_SUCCESS;
 614 }
 615
 616 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 617                                                  const struct ldb_message_element *e2,
 618                                                  const struct dsdb_schema *schema)
 619 {
 620         const struct dsdb_attribute *a1;
 621         const struct dsdb_attribute *a2;
 622
 623         /*
 624          * TODO: make this faster by caching the dsdb_attribute pointer
 625          *       on the ldb_messag_element
 626          */
 627
 628         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 629         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 630
 631         /*
 632          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 633          *       in the schema
 634          */
 635         if (!a1 || !a2) {
 636                 return strcasecmp(e1->name, e2->name);
 637         }
 638         if (a1->attributeID_id == a2->attributeID_id) {
 639                 return 0;
 640         }
 641         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 642 }
 643
 644 static void replmd_ldb_message_sort(struct ldb_message *msg,
 645                                     const struct dsdb_schema *schema)
 646 {
 647         LDB_TYPESAFE_QSORT(msg->elements, msg->num_elements, schema, replmd_ldb_message_element_attid_sort);
 648 }
 649
 650 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 651                                const struct GUID *invocation_id, uint64_t seq_num,
 652                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 653
 654
 655 /*
 656   fix up linked attributes in replmd_add.
 657   This involves setting up the right meta-data in extended DN
 658   components, and creating backlinks to the object
 659  */
 660 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 661                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 662                              struct GUID *guid, const struct dsdb_attribute *sa)
 663 {
 664         unsigned int i;
 665         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 666         struct ldb_context *ldb = ldb_module_get_ctx(module);
 667
 668         /* We will take a reference to the schema in replmd_add_backlink */
 669         const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
 670         NTTIME now;
 671
 672         unix_to_nt_time(&now, t);
 673
 674         for (i=0; i<el->num_values; i++) {
 675                 struct ldb_val *v = &el->values[i];
 676                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 677                 struct GUID target_guid;
 678                 NTSTATUS status;
 679                 int ret;
 680
 681                 /* note that the DN already has the extended
 682                    components from the extended_dn_store module */
 683                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 684                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 685                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid);
 686                         if (ret != LDB_SUCCESS) {
 687                                 talloc_free(tmp_ctx);
 688                                 return ret;
 689                         }
 690                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 691                         if (ret != LDB_SUCCESS) {
 692                                 talloc_free(tmp_ctx);
 693                                 return ret;
 694                         }
 695                 }
 696
 697                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 698                                           seq_num, seq_num, now, 0, false);
 699                 if (ret != LDB_SUCCESS) {
 700                         talloc_free(tmp_ctx);
 701                         return ret;
 702                 }
 703
 704                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 705                 if (ret != LDB_SUCCESS) {
 706                         talloc_free(tmp_ctx);
 707                         return ret;
 708                 }
 709         }
 710
 711         talloc_free(tmp_ctx);
 712         return LDB_SUCCESS;
 713 }
 714
 715
 716 /*
 717   intercept add requests
 718  */
 719 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 720 {
 721         struct ldb_context *ldb;
 722         struct ldb_control *control;
 723         struct replmd_replicated_request *ac;
 724         enum ndr_err_code ndr_err;
 725         struct ldb_request *down_req;
 726         struct ldb_message *msg;
 727         const DATA_BLOB *guid_blob;
 728         struct GUID guid;
 729         struct replPropertyMetaDataBlob nmd;
 730         struct ldb_val nmd_value;
 731         const struct GUID *our_invocation_id;
 732         time_t t = time(NULL);
 733         NTTIME now;
 734         char *time_str;
 735         int ret;
 736         unsigned int i;
 737         uint32_t ni=0;
 738         bool allow_add_guid = false;
 739         bool remove_current_guid = false;
 740         bool is_urgent = false;
 741         struct ldb_message_element *objectclass_el;
 742
 743         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 744         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 745         if (control) {
 746                 allow_add_guid = true;
 747         }
 748
 749         /* do not manipulate our control entries */
 750         if (ldb_dn_is_special(req->op.add.message->dn)) {
 751                 return ldb_next_request(module, req);
 752         }
 753
 754         ldb = ldb_module_get_ctx(module);
 755
 756         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 757
 758         ac = replmd_ctx_init(module, req);
 759         if (!ac) {
 760                 return LDB_ERR_OPERATIONS_ERROR;
 761         }
 762
 763         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 764         if ( guid_blob != NULL ) {
 765                 if( !allow_add_guid ) {
 766                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 767                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 768                         talloc_free(ac);
 769                         return LDB_ERR_UNWILLING_TO_PERFORM;
 770                 } else {
 771                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 772                         if ( !NT_STATUS_IS_OK(status)) {
 773                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 774                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 775                                 talloc_free(ac);
 776                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 777                         }
 778                         /* we remove this attribute as it can be a string and will not be treated
 779                         correctly and then we will readd it latter on in the good format*/
 780                         remove_current_guid = true;
 781                 }
 782         } else {
 783                 /* a new GUID */
 784                 guid = GUID_random();
 785         }
 786
 787         /* Get a sequence number from the backend */
 788         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 789         if (ret != LDB_SUCCESS) {
 790                 talloc_free(ac);
 791                 return ret;
 792         }
 793
 794         /* get our invocationId */
 795         our_invocation_id = samdb_ntds_invocation_id(ldb);
 796         if (!our_invocation_id) {
 797                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 798                               "replmd_add: unable to find invocationId\n");
 799                 talloc_free(ac);
 800                 return LDB_ERR_OPERATIONS_ERROR;
 801         }
 802
 803         /* we have to copy the message as the caller might have it as a const */
 804         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 805         if (msg == NULL) {
 806                 ldb_oom(ldb);
 807                 talloc_free(ac);
 808                 return LDB_ERR_OPERATIONS_ERROR;
 809         }
 810
 811         /* generated times */
 812         unix_to_nt_time(&now, t);
 813         time_str = ldb_timestring(msg, t);
 814         if (!time_str) {
 815                 ldb_oom(ldb);
 816                 talloc_free(ac);
 817                 return LDB_ERR_OPERATIONS_ERROR;
 818         }
 819         if (remove_current_guid) {
 820                 ldb_msg_remove_attr(msg,"objectGUID");
 821         }
 822
 823         /*
 824          * remove autogenerated attributes
 825          */
 826         ldb_msg_remove_attr(msg, "whenCreated");
 827         ldb_msg_remove_attr(msg, "whenChanged");
 828         ldb_msg_remove_attr(msg, "uSNCreated");
 829         ldb_msg_remove_attr(msg, "uSNChanged");
 830         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 831
 832         /*
 833          * readd replicated attributes
 834          */
 835         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 836         if (ret != LDB_SUCCESS) {
 837                 ldb_oom(ldb);
 838                 talloc_free(ac);
 839                 return ret;
 840         }
 841
 842         /* build the replication meta_data */
 843         ZERO_STRUCT(nmd);
 844         nmd.version             = 1;
 845         nmd.ctr.ctr1.count      = msg->num_elements;
 846         nmd.ctr.ctr1.array      = talloc_array(msg,
 847                                                struct replPropertyMetaData1,
 848                                                nmd.ctr.ctr1.count);
 849         if (!nmd.ctr.ctr1.array) {
 850                 ldb_oom(ldb);
 851                 talloc_free(ac);
 852                 return LDB_ERR_OPERATIONS_ERROR;
 853         }
 854
 855         for (i=0; i < msg->num_elements; i++) {
 856                 struct ldb_message_element *e = &msg->elements[i];
 857                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 858                 const struct dsdb_attribute *sa;
 859
 860                 if (e->name[0] == '@') continue;
 861
 862                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 863                 if (!sa) {
 864                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 865                                       "replmd_add: attribute '%s' not defined in schema\n",
 866                                       e->name);
 867                         talloc_free(ac);
 868                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 869                 }
 870
 871                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 872                         /* if the attribute is not replicated (0x00000001)
 873                          * or constructed (0x00000004) it has no metadata
 874                          */
 875                         continue;
 876                 }
 877
 878 #if W2K3_LINKED_ATTRIBUTES
 879                 if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 880                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 881                         if (ret != LDB_SUCCESS) {
 882                                 talloc_free(ac);
 883                                 return ret;
 884                         }
 885                         /* linked attributes are not stored in
 886                            replPropertyMetaData in FL above w2k */
 887                         continue;
 888                 }
 889 #endif
 890
 891                 m->attid                        = sa->attributeID_id;
 892                 m->version                      = 1;
 893                 m->originating_change_time      = now;
 894                 m->originating_invocation_id    = *our_invocation_id;
 895                 m->originating_usn              = ac->seq_num;
 896                 m->local_usn                    = ac->seq_num;
 897                 ni++;
 898         }
 899
 900         /* fix meta data count */
 901         nmd.ctr.ctr1.count = ni;
 902
 903         /*
 904          * sort meta data array, and move the rdn attribute entry to the end
 905          */
 906         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 907         if (ret != LDB_SUCCESS) {
 908                 talloc_free(ac);
 909                 return ret;
 910         }
 911
 912         /* generated NDR encoded values */
 913         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 914                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 915                                        &nmd,
 916                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 917         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 918                 ldb_oom(ldb);
 919                 talloc_free(ac);
 920                 return LDB_ERR_OPERATIONS_ERROR;
 921         }
 922
 923         /*
 924          * add the autogenerated values
 925          */
 926         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 927         if (ret != LDB_SUCCESS) {
 928                 ldb_oom(ldb);
 929                 talloc_free(ac);
 930                 return ret;
 931         }
 932         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 933         if (ret != LDB_SUCCESS) {
 934                 ldb_oom(ldb);
 935                 talloc_free(ac);
 936                 return ret;
 937         }
 938         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 939         if (ret != LDB_SUCCESS) {
 940                 ldb_oom(ldb);
 941                 talloc_free(ac);
 942                 return ret;
 943         }
 944         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 945         if (ret != LDB_SUCCESS) {
 946                 ldb_oom(ldb);
 947                 talloc_free(ac);
 948                 return ret;
 949         }
 950         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 951         if (ret != LDB_SUCCESS) {
 952                 ldb_oom(ldb);
 953                 talloc_free(ac);
 954                 return ret;
 955         }
 956
 957         /*
 958          * sort the attributes by attid before storing the object
 959          */
 960         replmd_ldb_message_sort(msg, ac->schema);
 961
 962         objectclass_el = ldb_msg_find_element(msg, "objectClass");
 963         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
 964                                                         REPL_URGENT_ON_CREATE);
 965
 966         ac->is_urgent = is_urgent;
 967         ret = ldb_build_add_req(&down_req, ldb, ac,
 968                                 msg,
 969                                 req->controls,
 970                                 ac, replmd_op_callback,
 971                                 req);
 972
 973         if (ret != LDB_SUCCESS) {
 974                 talloc_free(ac);
 975                 return ret;
 976         }
 977
 978         /* mark the control done */
 979         if (control) {
 980                 control->critical = 0;
 981         }
 982
 983         /* go on with the call chain */
 984         return ldb_next_request(module, down_req);
 985 }
 986
 987
 988 /*
 989  * update the replPropertyMetaData for one element
 990  */
 991 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 992                                       struct ldb_message *msg,
 993                                       struct ldb_message_element *el,
 994                                       struct ldb_message_element *old_el,
 995                                       struct replPropertyMetaDataBlob *omd,
 996                                       const struct dsdb_schema *schema,
 997                                       uint64_t *seq_num,
 998                                       const struct GUID *our_invocation_id,
 999                                       NTTIME now)
1000 {
1001         uint32_t i;
1002         const struct dsdb_attribute *a;
1003         struct replPropertyMetaData1 *md1;
1004
1005         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1006         if (a == NULL) {
1007                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1008                          el->name));
1009                 return LDB_ERR_OPERATIONS_ERROR;
1010         }
1011
1012         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1013                 return LDB_SUCCESS;
1014         }
1015
1016         /* if the attribute's value haven't changed then return LDB_SUCCESS     */
1017         if (old_el != NULL && ldb_msg_element_compare(el, old_el) == 0) {
1018                 return LDB_SUCCESS;
1019         }
1020
1021         for (i=0; i<omd->ctr.ctr1.count; i++) {
1022                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1023         }
1024
1025 #if W2K3_LINKED_ATTRIBUTES
1026         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1027                 /* linked attributes are not stored in
1028                    replPropertyMetaData in FL above w2k, but we do
1029                    raise the seqnum for the object  */
1030                 if (*seq_num == 0 &&
1031                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1032                         return LDB_ERR_OPERATIONS_ERROR;
1033                 }
1034                 return LDB_SUCCESS;
1035         }
1036 #endif
1037
1038         if (i == omd->ctr.ctr1.count) {
1039                 /* we need to add a new one */
1040                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1041                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1042                 if (omd->ctr.ctr1.array == NULL) {
1043                         ldb_oom(ldb);
1044                         return LDB_ERR_OPERATIONS_ERROR;
1045                 }
1046                 omd->ctr.ctr1.count++;
1047                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1048         }
1049
1050         /* Get a new sequence number from the backend. We only do this
1051          * if we have a change that requires a new
1052          * replPropertyMetaData element
1053          */
1054         if (*seq_num == 0) {
1055                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1056                 if (ret != LDB_SUCCESS) {
1057                         return LDB_ERR_OPERATIONS_ERROR;
1058                 }
1059         }
1060
1061         md1 = &omd->ctr.ctr1.array[i];
1062         md1->version++;
1063         md1->attid                     = a->attributeID_id;
1064         md1->originating_change_time   = now;
1065         md1->originating_invocation_id = *our_invocation_id;
1066         md1->originating_usn           = *seq_num;
1067         md1->local_usn                 = *seq_num;
1068
1069         return LDB_SUCCESS;
1070 }
1071
1072 /*
1073  * update the replPropertyMetaData object each time we modify an
1074  * object. This is needed for DRS replication, as the merge on the
1075  * client is based on this object
1076  */
1077 static int replmd_update_rpmd(struct ldb_module *module,
1078                               const struct dsdb_schema *schema,
1079                               struct ldb_message *msg, uint64_t *seq_num,
1080                               time_t t,
1081                               bool *is_urgent)
1082 {
1083         const struct ldb_val *omd_value;
1084         enum ndr_err_code ndr_err;
1085         struct replPropertyMetaDataBlob omd;
1086         unsigned int i;
1087         NTTIME now;
1088         const struct GUID *our_invocation_id;
1089         int ret;
1090         const char *attrs[] = { "replPropertyMetaData", "*", NULL };
1091         struct ldb_result *res;
1092         struct ldb_context *ldb;
1093         struct ldb_message_element *objectclass_el;
1094         enum urgent_situation situation;
1095
1096         ldb = ldb_module_get_ctx(module);
1097
1098         our_invocation_id = samdb_ntds_invocation_id(ldb);
1099         if (!our_invocation_id) {
1100                 /* this happens during an initial vampire while
1101                    updating the schema */
1102                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1103                 return LDB_SUCCESS;
1104         }
1105
1106         unix_to_nt_time(&now, t);
1107
1108         /* search for the existing replPropertyMetaDataBlob. We need
1109          * to use REVEAL and ask for DNs in storage format to support
1110          * the check for values being the same in
1111          * replmd_update_rpmd_element()
1112          */
1113         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
1114                                     DSDB_SEARCH_SHOW_DELETED |
1115                                     DSDB_SEARCH_SHOW_EXTENDED_DN |
1116                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1117                                     DSDB_SEARCH_REVEAL_INTERNALS);
1118         if (ret != LDB_SUCCESS || res->count != 1) {
1119                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1120                          ldb_dn_get_linearized(msg->dn)));
1121                 return LDB_ERR_OPERATIONS_ERROR;
1122         }
1123
1124         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1125          * otherwise we consider we are updating */
1126         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1127                 situation = REPL_URGENT_ON_DELETE;
1128         } else {
1129                 situation = REPL_URGENT_ON_UPDATE;
1130         }
1131
1132         objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1133         if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1134                                                         situation)) {
1135                 *is_urgent = true;
1136         }
1137
1138         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1139         if (!omd_value) {
1140                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1141                          ldb_dn_get_linearized(msg->dn)));
1142                 return LDB_ERR_OPERATIONS_ERROR;
1143         }
1144
1145         ndr_err = ndr_pull_struct_blob(omd_value, msg,
1146                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
1147                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1148         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1149                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1150                          ldb_dn_get_linearized(msg->dn)));
1151                 return LDB_ERR_OPERATIONS_ERROR;
1152         }
1153
1154         if (omd.version != 1) {
1155                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1156                          omd.version, ldb_dn_get_linearized(msg->dn)));
1157                 return LDB_ERR_OPERATIONS_ERROR;
1158         }
1159
1160         for (i=0; i<msg->num_elements; i++) {
1161                 struct ldb_message_element *old_el;
1162                 old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1163                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1164                                                  our_invocation_id, now);
1165                 if (ret != LDB_SUCCESS) {
1166                         return ret;
1167                 }
1168
1169                 if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1170                         *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1171                 }
1172
1173         }
1174
1175         /*
1176          * replmd_update_rpmd_element has done an update if the
1177          * seq_num is set
1178          */
1179         if (*seq_num != 0) {
1180                 struct ldb_val *md_value;
1181                 struct ldb_message_element *el;
1182
1183                 md_value = talloc(msg, struct ldb_val);
1184                 if (md_value == NULL) {
1185                         ldb_oom(ldb);
1186                         return LDB_ERR_OPERATIONS_ERROR;
1187                 }
1188
1189                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1190                 if (ret != LDB_SUCCESS) {
1191                         return ret;
1192                 }
1193
1194                 ndr_err = ndr_push_struct_blob(md_value, msg,
1195                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1196                                                &omd,
1197                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1198                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1199                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1200                                  ldb_dn_get_linearized(msg->dn)));
1201                         return LDB_ERR_OPERATIONS_ERROR;
1202                 }
1203
1204                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1205                 if (ret != LDB_SUCCESS) {
1206                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1207                                  ldb_dn_get_linearized(msg->dn)));
1208                         return ret;
1209                 }
1210
1211                 el->num_values = 1;
1212                 el->values = md_value;
1213         }
1214
1215         return LDB_SUCCESS;
1216 }
1217
1218 struct parsed_dn {
1219         struct dsdb_dn *dsdb_dn;
1220         struct GUID *guid;
1221         struct ldb_val *v;
1222 };
1223
1224 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1225 {
1226         return GUID_compare(pdn1->guid, pdn2->guid);
1227 }
1228
1229 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1230 {
1231         struct parsed_dn *ret;
1232         if (dn && GUID_all_zero(guid)) {
1233                 /* when updating a link using DRS, we sometimes get a
1234                    NULL GUID. We then need to try and match by DN */
1235                 int i;
1236                 for (i=0; i<count; i++) {
1237                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1238                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1239                                 return &pdn[i];
1240                         }
1241                 }
1242                 return NULL;
1243         }
1244         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1245         return ret;
1246 }
1247
1248 /*
1249   get a series of message element values as an array of DNs and GUIDs
1250   the result is sorted by GUID
1251  */
1252 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1253                           struct ldb_message_element *el, struct parsed_dn **pdn,
1254                           const char *ldap_oid)
1255 {
1256         unsigned int i;
1257         struct ldb_context *ldb = ldb_module_get_ctx(module);
1258
1259         if (el == NULL) {
1260                 *pdn = NULL;
1261                 return LDB_SUCCESS;
1262         }
1263
1264         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1265         if (!*pdn) {
1266                 ldb_module_oom(module);
1267                 return LDB_ERR_OPERATIONS_ERROR;
1268         }
1269
1270         for (i=0; i<el->num_values; i++) {
1271                 struct ldb_val *v = &el->values[i];
1272                 NTSTATUS status;
1273                 struct ldb_dn *dn;
1274                 struct parsed_dn *p;
1275
1276                 p = &(*pdn)[i];
1277
1278                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1279                 if (p->dsdb_dn == NULL) {
1280                         return LDB_ERR_INVALID_DN_SYNTAX;
1281                 }
1282
1283                 dn = p->dsdb_dn->dn;
1284
1285                 p->guid = talloc(*pdn, struct GUID);
1286                 if (p->guid == NULL) {
1287                         ldb_module_oom(module);
1288                         return LDB_ERR_OPERATIONS_ERROR;
1289                 }
1290
1291                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1292                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1293                         /* we got a DN without a GUID - go find the GUID */
1294                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1295                         if (ret != LDB_SUCCESS) {
1296                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1297                                                        ldb_dn_get_linearized(dn));
1298                                 return ret;
1299                         }
1300                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1301                         if (ret != LDB_SUCCESS) {
1302                                 return ret;
1303                         }
1304                 } else if (!NT_STATUS_IS_OK(status)) {
1305                         return LDB_ERR_OPERATIONS_ERROR;
1306                 }
1307
1308                 /* keep a pointer to the original ldb_val */
1309                 p->v = v;
1310         }
1311
1312         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1313
1314         return LDB_SUCCESS;
1315 }
1316
1317 /*
1318   build a new extended DN, including all meta data fields
1319
1320   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1321   RMD_ADDTIME         = originating_add_time
1322   RMD_INVOCID         = originating_invocation_id
1323   RMD_CHANGETIME      = originating_change_time
1324   RMD_ORIGINATING_USN = originating_usn
1325   RMD_LOCAL_USN       = local_usn
1326   RMD_VERSION         = version
1327  */
1328 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1329                                const struct GUID *invocation_id, uint64_t seq_num,
1330                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1331 {
1332         struct ldb_dn *dn = dsdb_dn->dn;
1333         const char *tstring, *usn_string, *flags_string;
1334         struct ldb_val tval;
1335         struct ldb_val iid;
1336         struct ldb_val usnv, local_usnv;
1337         struct ldb_val vers, flagsv;
1338         NTSTATUS status;
1339         int ret;
1340         const char *dnstring;
1341         char *vstring;
1342         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1343
1344         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1345         if (!tstring) {
1346                 return LDB_ERR_OPERATIONS_ERROR;
1347         }
1348         tval = data_blob_string_const(tstring);
1349
1350         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1351         if (!usn_string) {
1352                 return LDB_ERR_OPERATIONS_ERROR;
1353         }
1354         usnv = data_blob_string_const(usn_string);
1355
1356         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1357         if (!usn_string) {
1358                 return LDB_ERR_OPERATIONS_ERROR;
1359         }
1360         local_usnv = data_blob_string_const(usn_string);
1361
1362         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1363         if (!vstring) {
1364                 return LDB_ERR_OPERATIONS_ERROR;
1365         }
1366         vers = data_blob_string_const(vstring);
1367
1368         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1369         if (!NT_STATUS_IS_OK(status)) {
1370                 return LDB_ERR_OPERATIONS_ERROR;
1371         }
1372
1373         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1374         if (!flags_string) {
1375                 return LDB_ERR_OPERATIONS_ERROR;
1376         }
1377         flagsv = data_blob_string_const(flags_string);
1378
1379         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1380         if (ret != LDB_SUCCESS) return ret;
1381         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1382         if (ret != LDB_SUCCESS) return ret;
1383         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1384         if (ret != LDB_SUCCESS) return ret;
1385         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1386         if (ret != LDB_SUCCESS) return ret;
1387         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1388         if (ret != LDB_SUCCESS) return ret;
1389         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1390         if (ret != LDB_SUCCESS) return ret;
1391         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1392         if (ret != LDB_SUCCESS) return ret;
1393
1394         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1395         if (dnstring == NULL) {
1396                 return LDB_ERR_OPERATIONS_ERROR;
1397         }
1398         *v = data_blob_string_const(dnstring);
1399
1400         return LDB_SUCCESS;
1401 }
1402
1403 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1404                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1405                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1406                                 uint32_t version, bool deleted);
1407
1408 /*
1409   check if any links need upgrading from w2k format
1410
1411   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.
1412  */
1413 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1414 {
1415         uint32_t i;
1416         for (i=0; i<count; i++) {
1417                 NTSTATUS status;
1418                 uint32_t version;
1419                 int ret;
1420
1421                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1422                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1423                         continue;
1424                 }
1425
1426                 /* it's an old one that needs upgrading */
1427                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1428                                            1, 1, 0, 0, false);
1429                 if (ret != LDB_SUCCESS) {
1430                         return ret;
1431                 }
1432         }
1433         return LDB_SUCCESS;
1434 }
1435
1436 /*
1437   update an extended DN, including all meta data fields
1438
1439   see replmd_build_la_val for value names
1440  */
1441 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1442                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1443                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1444                                 uint32_t version, bool deleted)
1445 {
1446         struct ldb_dn *dn = dsdb_dn->dn;
1447         const char *tstring, *usn_string, *flags_string;
1448         struct ldb_val tval;
1449         struct ldb_val iid;
1450         struct ldb_val usnv, local_usnv;
1451         struct ldb_val vers, flagsv;
1452         const struct ldb_val *old_addtime;
1453         uint32_t old_version;
1454         NTSTATUS status;
1455         int ret;
1456         const char *dnstring;
1457         char *vstring;
1458         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1459
1460         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1461         if (!tstring) {
1462                 return LDB_ERR_OPERATIONS_ERROR;
1463         }
1464         tval = data_blob_string_const(tstring);
1465
1466         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1467         if (!usn_string) {
1468                 return LDB_ERR_OPERATIONS_ERROR;
1469         }
1470         usnv = data_blob_string_const(usn_string);
1471
1472         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1473         if (!usn_string) {
1474                 return LDB_ERR_OPERATIONS_ERROR;
1475         }
1476         local_usnv = data_blob_string_const(usn_string);
1477
1478         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1479         if (!NT_STATUS_IS_OK(status)) {
1480                 return LDB_ERR_OPERATIONS_ERROR;
1481         }
1482
1483         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1484         if (!flags_string) {
1485                 return LDB_ERR_OPERATIONS_ERROR;
1486         }
1487         flagsv = data_blob_string_const(flags_string);
1488
1489         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1490         if (ret != LDB_SUCCESS) return ret;
1491
1492         /* get the ADDTIME from the original */
1493         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1494         if (old_addtime == NULL) {
1495                 old_addtime = &tval;
1496         }
1497         if (dsdb_dn != old_dsdb_dn) {
1498                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1499                 if (ret != LDB_SUCCESS) return ret;
1500         }
1501
1502         /* use our invocation id */
1503         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1504         if (ret != LDB_SUCCESS) return ret;
1505
1506         /* changetime is the current time */
1507         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1508         if (ret != LDB_SUCCESS) return ret;
1509
1510         /* update the USN */
1511         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1512         if (ret != LDB_SUCCESS) return ret;
1513
1514         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1515         if (ret != LDB_SUCCESS) return ret;
1516
1517         /* increase the version by 1 */
1518         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1519         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1520                 version = old_version+1;
1521         }
1522         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1523         vers = data_blob_string_const(vstring);
1524         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1525         if (ret != LDB_SUCCESS) return ret;
1526
1527         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1528         if (dnstring == NULL) {
1529                 return LDB_ERR_OPERATIONS_ERROR;
1530         }
1531         *v = data_blob_string_const(dnstring);
1532
1533         return LDB_SUCCESS;
1534 }
1535
1536 /*
1537   handle adding a linked attribute
1538  */
1539 static int replmd_modify_la_add(struct ldb_module *module,
1540                                 const struct dsdb_schema *schema,
1541                                 struct ldb_message *msg,
1542                                 struct ldb_message_element *el,
1543                                 struct ldb_message_element *old_el,
1544                                 const struct dsdb_attribute *schema_attr,
1545                                 uint64_t seq_num,
1546                                 time_t t,
1547                                 struct GUID *msg_guid)
1548 {
1549         unsigned int i;
1550         struct parsed_dn *dns, *old_dns;
1551         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1552         int ret;
1553         struct ldb_val *new_values = NULL;
1554         unsigned int num_new_values = 0;
1555         unsigned old_num_values = old_el?old_el->num_values:0;
1556         const struct GUID *invocation_id;
1557         struct ldb_context *ldb = ldb_module_get_ctx(module);
1558         NTTIME now;
1559
1560         unix_to_nt_time(&now, t);
1561
1562         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1563         if (ret != LDB_SUCCESS) {
1564                 talloc_free(tmp_ctx);
1565                 return ret;
1566         }
1567
1568         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1569         if (ret != LDB_SUCCESS) {
1570                 talloc_free(tmp_ctx);
1571                 return ret;
1572         }
1573
1574         invocation_id = samdb_ntds_invocation_id(ldb);
1575         if (!invocation_id) {
1576                 talloc_free(tmp_ctx);
1577                 return LDB_ERR_OPERATIONS_ERROR;
1578         }
1579
1580         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1581         if (ret != LDB_SUCCESS) {
1582                 talloc_free(tmp_ctx);
1583                 return ret;
1584         }
1585
1586         /* for each new value, see if it exists already with the same GUID */
1587         for (i=0; i<el->num_values; i++) {
1588                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1589                 if (p == NULL) {
1590                         /* this is a new linked attribute value */
1591                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1592                         if (new_values == NULL) {
1593                                 ldb_module_oom(module);
1594                                 talloc_free(tmp_ctx);
1595                                 return LDB_ERR_OPERATIONS_ERROR;
1596                         }
1597                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1598                                                   invocation_id, seq_num, seq_num, now, 0, false);
1599                         if (ret != LDB_SUCCESS) {
1600                                 talloc_free(tmp_ctx);
1601                                 return ret;
1602                         }
1603                         num_new_values++;
1604                 } else {
1605                         /* this is only allowed if the GUID was
1606                            previously deleted. */
1607                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1608
1609                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1610                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1611                                                        el->name, GUID_string(tmp_ctx, p->guid));
1612                                 talloc_free(tmp_ctx);
1613                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1614                         }
1615                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1616                                                    invocation_id, seq_num, seq_num, now, 0, false);
1617                         if (ret != LDB_SUCCESS) {
1618                                 talloc_free(tmp_ctx);
1619                                 return ret;
1620                         }
1621                 }
1622
1623                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1624                 if (ret != LDB_SUCCESS) {
1625                         talloc_free(tmp_ctx);
1626                         return ret;
1627                 }
1628         }
1629
1630         /* add the new ones on to the end of the old values, constructing a new el->values */
1631         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1632                                     struct ldb_val,
1633                                     old_num_values+num_new_values);
1634         if (el->values == NULL) {
1635                 ldb_module_oom(module);
1636                 return LDB_ERR_OPERATIONS_ERROR;
1637         }
1638
1639         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1640         el->num_values = old_num_values + num_new_values;
1641
1642         talloc_steal(msg->elements, el->values);
1643         talloc_steal(el->values, new_values);
1644
1645         talloc_free(tmp_ctx);
1646
1647         /* we now tell the backend to replace all existing values
1648            with the one we have constructed */
1649         el->flags = LDB_FLAG_MOD_REPLACE;
1650
1651         return LDB_SUCCESS;
1652 }
1653
1654
1655 /*
1656   handle deleting all active linked attributes
1657  */
1658 static int replmd_modify_la_delete(struct ldb_module *module,
1659                                    const struct dsdb_schema *schema,
1660                                    struct ldb_message *msg,
1661                                    struct ldb_message_element *el,
1662                                    struct ldb_message_element *old_el,
1663                                    const struct dsdb_attribute *schema_attr,
1664                                    uint64_t seq_num,
1665                                    time_t t,
1666                                    struct GUID *msg_guid)
1667 {
1668         unsigned int i;
1669         struct parsed_dn *dns, *old_dns;
1670         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1671         int ret;
1672         const struct GUID *invocation_id;
1673         struct ldb_context *ldb = ldb_module_get_ctx(module);
1674         NTTIME now;
1675
1676         unix_to_nt_time(&now, t);
1677
1678         /* check if there is nothing to delete */
1679         if ((!old_el || old_el->num_values == 0) &&
1680             el->num_values == 0) {
1681                 return LDB_SUCCESS;
1682         }
1683
1684         if (!old_el || old_el->num_values == 0) {
1685                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1686         }
1687
1688         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1689         if (ret != LDB_SUCCESS) {
1690                 talloc_free(tmp_ctx);
1691                 return ret;
1692         }
1693
1694         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1695         if (ret != LDB_SUCCESS) {
1696                 talloc_free(tmp_ctx);
1697                 return ret;
1698         }
1699
1700         invocation_id = samdb_ntds_invocation_id(ldb);
1701         if (!invocation_id) {
1702                 return LDB_ERR_OPERATIONS_ERROR;
1703         }
1704
1705         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
1706         if (ret != LDB_SUCCESS) {
1707                 talloc_free(tmp_ctx);
1708                 return ret;
1709         }
1710
1711         el->values = NULL;
1712
1713         /* see if we are being asked to delete any links that
1714            don't exist or are already deleted */
1715         for (i=0; i<el->num_values; i++) {
1716                 struct parsed_dn *p = &dns[i];
1717                 struct parsed_dn *p2;
1718                 uint32_t rmd_flags;
1719
1720                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1721                 if (!p2) {
1722                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1723                                                el->name, GUID_string(tmp_ctx, p->guid));
1724                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1725                 }
1726                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1727                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1728                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1729                                                el->name, GUID_string(tmp_ctx, p->guid));
1730                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1731                 }
1732         }
1733
1734         /* for each new value, see if it exists already with the same GUID
1735            if it is not already deleted and matches the delete list then delete it
1736         */
1737         for (i=0; i<old_el->num_values; i++) {
1738                 struct parsed_dn *p = &old_dns[i];
1739                 uint32_t rmd_flags;
1740
1741                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1742                         continue;
1743                 }
1744
1745                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1746                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1747
1748                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1749                                            invocation_id, seq_num, seq_num, now, 0, true);
1750                 if (ret != LDB_SUCCESS) {
1751                         talloc_free(tmp_ctx);
1752                         return ret;
1753                 }
1754
1755                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1756                 if (ret != LDB_SUCCESS) {
1757                         talloc_free(tmp_ctx);
1758                         return ret;
1759                 }
1760         }
1761
1762         el->values = talloc_steal(msg->elements, old_el->values);
1763         el->num_values = old_el->num_values;
1764
1765         talloc_free(tmp_ctx);
1766
1767         /* we now tell the backend to replace all existing values
1768            with the one we have constructed */
1769         el->flags = LDB_FLAG_MOD_REPLACE;
1770
1771         return LDB_SUCCESS;
1772 }
1773
1774 /*
1775   handle replacing a linked attribute
1776  */
1777 static int replmd_modify_la_replace(struct ldb_module *module,
1778                                     const struct dsdb_schema *schema,
1779                                     struct ldb_message *msg,
1780                                     struct ldb_message_element *el,
1781                                     struct ldb_message_element *old_el,
1782                                     const struct dsdb_attribute *schema_attr,
1783                                     uint64_t seq_num,
1784                                     time_t t,
1785                                     struct GUID *msg_guid)
1786 {
1787         unsigned int i;
1788         struct parsed_dn *dns, *old_dns;
1789         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1790         int ret;
1791         const struct GUID *invocation_id;
1792         struct ldb_context *ldb = ldb_module_get_ctx(module);
1793         struct ldb_val *new_values = NULL;
1794         unsigned int num_new_values = 0;
1795         unsigned int old_num_values = old_el?old_el->num_values:0;
1796         NTTIME now;
1797
1798         unix_to_nt_time(&now, t);
1799
1800         /* check if there is nothing to replace */
1801         if ((!old_el || old_el->num_values == 0) &&
1802             el->num_values == 0) {
1803                 return LDB_SUCCESS;
1804         }
1805
1806         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1807         if (ret != LDB_SUCCESS) {
1808                 talloc_free(tmp_ctx);
1809                 return ret;
1810         }
1811
1812         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1813         if (ret != LDB_SUCCESS) {
1814                 talloc_free(tmp_ctx);
1815                 return ret;
1816         }
1817
1818         invocation_id = samdb_ntds_invocation_id(ldb);
1819         if (!invocation_id) {
1820                 return LDB_ERR_OPERATIONS_ERROR;
1821         }
1822
1823         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1824         if (ret != LDB_SUCCESS) {
1825                 talloc_free(tmp_ctx);
1826                 return ret;
1827         }
1828
1829         /* mark all the old ones as deleted */
1830         for (i=0; i<old_num_values; i++) {
1831                 struct parsed_dn *old_p = &old_dns[i];
1832                 struct parsed_dn *p;
1833                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1834
1835                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1836
1837                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1838                 if (ret != LDB_SUCCESS) {
1839                         talloc_free(tmp_ctx);
1840                         return ret;
1841                 }
1842
1843                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1844                 if (p) {
1845                         /* we don't delete it if we are re-adding it */
1846                         continue;
1847                 }
1848
1849                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1850                                            invocation_id, seq_num, seq_num, now, 0, true);
1851                 if (ret != LDB_SUCCESS) {
1852                         talloc_free(tmp_ctx);
1853                         return ret;
1854                 }
1855         }
1856
1857         /* for each new value, either update its meta-data, or add it
1858          * to old_el
1859         */
1860         for (i=0; i<el->num_values; i++) {
1861                 struct parsed_dn *p = &dns[i], *old_p;
1862
1863                 if (old_dns &&
1864                     (old_p = parsed_dn_find(old_dns,
1865                                             old_num_values, p->guid, NULL)) != NULL) {
1866                         /* update in place */
1867                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1868                                                    old_p->dsdb_dn, invocation_id,
1869                                                    seq_num, seq_num, now, 0, false);
1870                         if (ret != LDB_SUCCESS) {
1871                                 talloc_free(tmp_ctx);
1872                                 return ret;
1873                         }
1874                 } else {
1875                         /* add a new one */
1876                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1877                                                     num_new_values+1);
1878                         if (new_values == NULL) {
1879                                 ldb_module_oom(module);
1880                                 talloc_free(tmp_ctx);
1881                                 return LDB_ERR_OPERATIONS_ERROR;
1882                         }
1883                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1884                                                   invocation_id, seq_num, seq_num, now, 0, false);
1885                         if (ret != LDB_SUCCESS) {
1886                                 talloc_free(tmp_ctx);
1887                                 return ret;
1888                         }
1889                         num_new_values++;
1890                 }
1891
1892                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1893                 if (ret != LDB_SUCCESS) {
1894                         talloc_free(tmp_ctx);
1895                         return ret;
1896                 }
1897         }
1898
1899         /* add the new values to the end of old_el */
1900         if (num_new_values != 0) {
1901                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1902                                             struct ldb_val, old_num_values+num_new_values);
1903                 if (el->values == NULL) {
1904                         ldb_module_oom(module);
1905                         return LDB_ERR_OPERATIONS_ERROR;
1906                 }
1907                 memcpy(&el->values[old_num_values], &new_values[0],
1908                        sizeof(struct ldb_val)*num_new_values);
1909                 el->num_values = old_num_values + num_new_values;
1910                 talloc_steal(msg->elements, new_values);
1911         } else {
1912                 el->values = old_el->values;
1913                 el->num_values = old_el->num_values;
1914                 talloc_steal(msg->elements, el->values);
1915         }
1916
1917         talloc_free(tmp_ctx);
1918
1919         /* we now tell the backend to replace all existing values
1920            with the one we have constructed */
1921         el->flags = LDB_FLAG_MOD_REPLACE;
1922
1923         return LDB_SUCCESS;
1924 }
1925
1926
1927 /*
1928   handle linked attributes in modify requests
1929  */
1930 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1931                                                struct ldb_message *msg,
1932                                                uint64_t seq_num, time_t t)
1933 {
1934         struct ldb_result *res;
1935         unsigned int i;
1936         int ret;
1937         struct ldb_context *ldb = ldb_module_get_ctx(module);
1938         struct ldb_message *old_msg;
1939
1940         const struct dsdb_schema *schema;
1941         struct GUID old_guid;
1942
1943         if (seq_num == 0) {
1944                 /* there the replmd_update_rpmd code has already
1945                  * checked and saw that there are no linked
1946                  * attributes */
1947                 return LDB_SUCCESS;
1948         }
1949
1950 #if !W2K3_LINKED_ATTRIBUTES
1951         return LDB_SUCCESS;
1952 #endif
1953
1954         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1955                 /* don't do anything special for linked attributes */
1956                 return LDB_SUCCESS;
1957         }
1958
1959         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1960                                     DSDB_SEARCH_SHOW_DELETED |
1961                                     DSDB_SEARCH_REVEAL_INTERNALS |
1962                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1963         if (ret != LDB_SUCCESS) {
1964                 return ret;
1965         }
1966         schema = dsdb_get_schema(ldb, res);
1967         if (!schema) {
1968                 return LDB_ERR_OPERATIONS_ERROR;
1969         }
1970
1971         old_msg = res->msgs[0];
1972
1973         old_guid = samdb_result_guid(old_msg, "objectGUID");
1974
1975         for (i=0; i<msg->num_elements; i++) {
1976                 struct ldb_message_element *el = &msg->elements[i];
1977                 struct ldb_message_element *old_el, *new_el;
1978                 const struct dsdb_attribute *schema_attr
1979                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1980                 if (!schema_attr) {
1981                         ldb_asprintf_errstring(ldb,
1982                                                "attribute %s is not a valid attribute in schema", el->name);
1983                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
1984                 }
1985                 if (schema_attr->linkID == 0) {
1986                         continue;
1987                 }
1988                 if ((schema_attr->linkID & 1) == 1) {
1989                         /* Odd is for the target.  Illegal to modify */
1990                         ldb_asprintf_errstring(ldb,
1991                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
1992                         return LDB_ERR_UNWILLING_TO_PERFORM;
1993                 }
1994                 old_el = ldb_msg_find_element(old_msg, el->name);
1995                 switch (el->flags & LDB_FLAG_MOD_MASK) {
1996                 case LDB_FLAG_MOD_REPLACE:
1997                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1998                         break;
1999                 case LDB_FLAG_MOD_DELETE:
2000                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2001                         break;
2002                 case LDB_FLAG_MOD_ADD:
2003                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2004                         break;
2005                 default:
2006                         ldb_asprintf_errstring(ldb,
2007                                                "invalid flags 0x%x for %s linked attribute",
2008                                                el->flags, el->name);
2009                         return LDB_ERR_UNWILLING_TO_PERFORM;
2010                 }
2011                 if (ret != LDB_SUCCESS) {
2012                         return ret;
2013                 }
2014                 if (old_el) {
2015                         ldb_msg_remove_attr(old_msg, el->name);
2016                 }
2017                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2018                 new_el->num_values = el->num_values;
2019                 new_el->values = talloc_steal(msg->elements, el->values);
2020
2021                 /* TODO: this relises a bit too heavily on the exact
2022                    behaviour of ldb_msg_find_element and
2023                    ldb_msg_remove_element */
2024                 old_el = ldb_msg_find_element(msg, el->name);
2025                 if (old_el != el) {
2026                         ldb_msg_remove_element(msg, old_el);
2027                         i--;
2028                 }
2029         }
2030
2031         talloc_free(res);
2032         return ret;
2033 }
2034
2035
2036
2037 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2038 {
2039         struct ldb_context *ldb;
2040         struct replmd_replicated_request *ac;
2041         struct ldb_request *down_req;
2042         struct ldb_message *msg;
2043         time_t t = time(NULL);
2044         int ret;
2045         bool is_urgent = false;
2046
2047         /* do not manipulate our control entries */
2048         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2049                 return ldb_next_request(module, req);
2050         }
2051
2052         ldb = ldb_module_get_ctx(module);
2053
2054         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2055
2056         ac = replmd_ctx_init(module, req);
2057         if (!ac) {
2058                 return LDB_ERR_OPERATIONS_ERROR;
2059         }
2060
2061         /* we have to copy the message as the caller might have it as a const */
2062         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2063         if (msg == NULL) {
2064                 ldb_oom(ldb);
2065                 talloc_free(ac);
2066                 return LDB_ERR_OPERATIONS_ERROR;
2067         }
2068
2069         ldb_msg_remove_attr(msg, "whenChanged");
2070         ldb_msg_remove_attr(msg, "uSNChanged");
2071
2072         ret = replmd_update_rpmd(module, ac->schema, msg, &ac->seq_num, t, &is_urgent);
2073         if (ret != LDB_SUCCESS) {
2074                 talloc_free(ac);
2075                 return ret;
2076         }
2077
2078         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
2079         if (ret != LDB_SUCCESS) {
2080                 talloc_free(ac);
2081                 return ret;
2082         }
2083
2084         /* TODO:
2085          * - replace the old object with the newly constructed one
2086          */
2087
2088         ac->is_urgent = is_urgent;
2089
2090         ret = ldb_build_mod_req(&down_req, ldb, ac,
2091                                 msg,
2092                                 req->controls,
2093                                 ac, replmd_op_callback,
2094                                 req);
2095         if (ret != LDB_SUCCESS) {
2096                 talloc_free(ac);
2097                 return ret;
2098         }
2099         talloc_steal(down_req, msg);
2100
2101         /* we only change whenChanged and uSNChanged if the seq_num
2102            has changed */
2103         if (ac->seq_num != 0) {
2104                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2105                         talloc_free(ac);
2106                         return ret;
2107                 }
2108
2109                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2110                         talloc_free(ac);
2111                         return ret;
2112                 }
2113         }
2114
2115         /* go on with the call chain */
2116         return ldb_next_request(module, down_req);
2117 }
2118
2119 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2120
2121 /*
2122   handle a rename request
2123
2124   On a rename we need to do an extra ldb_modify which sets the
2125   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2126  */
2127 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2128 {
2129         struct ldb_context *ldb;
2130         struct replmd_replicated_request *ac;
2131         int ret;
2132         struct ldb_request *down_req;
2133
2134         /* do not manipulate our control entries */
2135         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2136                 return ldb_next_request(module, req);
2137         }
2138
2139         ldb = ldb_module_get_ctx(module);
2140
2141         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2142
2143         ac = replmd_ctx_init(module, req);
2144         if (!ac) {
2145                 return LDB_ERR_OPERATIONS_ERROR;
2146         }
2147         ret = ldb_build_rename_req(&down_req, ldb, ac,
2148                                    ac->req->op.rename.olddn,
2149                                    ac->req->op.rename.newdn,
2150                                    ac->req->controls,
2151                                    ac, replmd_rename_callback,
2152                                    ac->req);
2153
2154         if (ret != LDB_SUCCESS) {
2155                 talloc_free(ac);
2156                 return ret;
2157         }
2158
2159         /* go on with the call chain */
2160         return ldb_next_request(module, down_req);
2161 }
2162
2163 /* After the rename is compleated, update the whenchanged etc */
2164 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2165 {
2166         struct ldb_context *ldb;
2167         struct replmd_replicated_request *ac;
2168         struct ldb_request *down_req;
2169         struct ldb_message *msg;
2170         time_t t = time(NULL);
2171         int ret;
2172
2173         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2174         ldb = ldb_module_get_ctx(ac->module);
2175
2176         if (ares->error != LDB_SUCCESS) {
2177                 return ldb_module_done(ac->req, ares->controls,
2178                                         ares->response, ares->error);
2179         }
2180
2181         if (ares->type != LDB_REPLY_DONE) {
2182                 ldb_set_errstring(ldb,
2183                                   "invalid ldb_reply_type in callback");
2184                 talloc_free(ares);
2185                 return ldb_module_done(ac->req, NULL, NULL,
2186                                         LDB_ERR_OPERATIONS_ERROR);
2187         }
2188
2189         /* Get a sequence number from the backend */
2190         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2191         if (ret != LDB_SUCCESS) {
2192                 return ret;
2193         }
2194
2195         /* TODO:
2196          * - replace the old object with the newly constructed one
2197          */
2198
2199         msg = ldb_msg_new(ac);
2200         if (msg == NULL) {
2201                 ldb_oom(ldb);
2202                 return LDB_ERR_OPERATIONS_ERROR;
2203         }
2204
2205         msg->dn = ac->req->op.rename.newdn;
2206
2207         ret = ldb_build_mod_req(&down_req, ldb, ac,
2208                                 msg,
2209                                 req->controls,
2210                                 ac, replmd_op_callback,
2211                                 req);
2212
2213         if (ret != LDB_SUCCESS) {
2214                 talloc_free(ac);
2215                 return ret;
2216         }
2217         talloc_steal(down_req, msg);
2218
2219         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2220                 talloc_free(ac);
2221                 return ret;
2222         }
2223
2224         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2225                 talloc_free(ac);
2226                 return ret;
2227         }
2228
2229         /* go on with the call chain - do the modify after the rename */
2230         return ldb_next_request(ac->module, down_req);
2231 }
2232
2233 /*
2234    remove links from objects that point at this object when an object
2235    is deleted
2236  */
2237 static int replmd_delete_remove_link(struct ldb_module *module,
2238                                      const struct dsdb_schema *schema,
2239                                      struct ldb_dn *dn,
2240                                      struct ldb_message_element *el,
2241                                      const struct dsdb_attribute *sa)
2242 {
2243         unsigned int i;
2244         TALLOC_CTX *tmp_ctx = talloc_new(module);
2245         struct ldb_context *ldb = ldb_module_get_ctx(module);
2246
2247         for (i=0; i<el->num_values; i++) {
2248                 struct dsdb_dn *dsdb_dn;
2249                 NTSTATUS status;
2250                 int ret;
2251                 struct GUID guid2;
2252                 struct ldb_message *msg;
2253                 const struct dsdb_attribute *target_attr;
2254                 struct ldb_message_element *el2;
2255                 struct ldb_val dn_val;
2256
2257                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2258                         continue;
2259                 }
2260
2261                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2262                 if (!dsdb_dn) {
2263                         talloc_free(tmp_ctx);
2264                         return LDB_ERR_OPERATIONS_ERROR;
2265                 }
2266
2267                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2268                 if (!NT_STATUS_IS_OK(status)) {
2269                         talloc_free(tmp_ctx);
2270                         return LDB_ERR_OPERATIONS_ERROR;
2271                 }
2272
2273                 /* remove the link */
2274                 msg = ldb_msg_new(tmp_ctx);
2275                 if (!msg) {
2276                         ldb_module_oom(module);
2277                         talloc_free(tmp_ctx);
2278                         return LDB_ERR_OPERATIONS_ERROR;
2279                 }
2280
2281
2282                 msg->dn = dsdb_dn->dn;
2283
2284                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2285                 if (target_attr == NULL) {
2286                         continue;
2287                 }
2288
2289                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2290                 if (ret != LDB_SUCCESS) {
2291                         ldb_module_oom(module);
2292                         talloc_free(tmp_ctx);
2293                         return LDB_ERR_OPERATIONS_ERROR;
2294                 }
2295                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2296                 el2->values = &dn_val;
2297                 el2->num_values = 1;
2298
2299                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2300                 if (ret != LDB_SUCCESS) {
2301                         talloc_free(tmp_ctx);
2302                         return ret;
2303                 }
2304         }
2305         talloc_free(tmp_ctx);
2306         return LDB_SUCCESS;
2307 }
2308
2309
2310 /*
2311   handle update of replication meta data for deletion of objects
2312
2313   This also handles the mapping of delete to a rename operation
2314   to allow deletes to be replicated.
2315  */
2316 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2317 {
2318         int ret = LDB_ERR_OTHER;
2319         bool retb;
2320         struct ldb_dn *old_dn, *new_dn;
2321         const char *rdn_name;
2322         const struct ldb_val *rdn_value, *new_rdn_value;
2323         struct GUID guid;
2324         struct ldb_context *ldb = ldb_module_get_ctx(module);
2325         const struct dsdb_schema *schema;
2326         struct ldb_message *msg, *old_msg;
2327         struct ldb_message_element *el;
2328         TALLOC_CTX *tmp_ctx;
2329         struct ldb_result *res, *parent_res;
2330         const char *preserved_attrs[] = {
2331                 /* yes, this really is a hard coded list. See MS-ADTS
2332                    section 3.1.1.5.5.1.1 */
2333                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2334                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2335                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2336                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2337                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2338                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2339                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2340                 "whenChanged", NULL};
2341         unsigned int i, el_count = 0;
2342         enum deletion_state { OBJECT_NOT_DELETED=1, OBJECT_DELETED=2, OBJECT_RECYCLED=3,
2343                                                 OBJECT_TOMBSTONE=4, OBJECT_REMOVED=5 };
2344         enum deletion_state deletion_state, next_deletion_state;
2345         bool enabled;
2346
2347         if (ldb_dn_is_special(req->op.del.dn)) {
2348                 return ldb_next_request(module, req);
2349         }
2350
2351         tmp_ctx = talloc_new(ldb);
2352         if (!tmp_ctx) {
2353                 ldb_oom(ldb);
2354                 return LDB_ERR_OPERATIONS_ERROR;
2355         }
2356
2357         schema = dsdb_get_schema(ldb, tmp_ctx);
2358         if (!schema) {
2359                 return LDB_ERR_OPERATIONS_ERROR;
2360         }
2361
2362         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2363
2364         /* we need the complete msg off disk, so we can work out which
2365            attributes need to be removed */
2366         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2367                                     DSDB_SEARCH_SHOW_DELETED |
2368                                     DSDB_SEARCH_REVEAL_INTERNALS |
2369                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2370         if (ret != LDB_SUCCESS) {
2371                 talloc_free(tmp_ctx);
2372                 return ret;
2373         }
2374         old_msg = res->msgs[0];
2375
2376
2377         ret = dsdb_recyclebin_enabled(module, &enabled);
2378         if (ret != LDB_SUCCESS) {
2379                 talloc_free(tmp_ctx);
2380                 return ret;
2381         }
2382
2383         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2384                 if (!enabled) {
2385                         deletion_state = OBJECT_TOMBSTONE;
2386                         next_deletion_state = OBJECT_REMOVED;
2387                 } else if (ldb_msg_check_string_attribute(old_msg, "isRecycled", "TRUE")) {
2388                         deletion_state = OBJECT_RECYCLED;
2389                         next_deletion_state = OBJECT_REMOVED;
2390                 } else {
2391                         deletion_state = OBJECT_DELETED;
2392                         next_deletion_state = OBJECT_RECYCLED;
2393                 }
2394         } else {
2395                 deletion_state = OBJECT_NOT_DELETED;
2396                 if (enabled) {
2397                         next_deletion_state = OBJECT_DELETED;
2398                 } else {
2399                         next_deletion_state = OBJECT_TOMBSTONE;
2400                 }
2401         }
2402
2403         if (next_deletion_state == OBJECT_REMOVED) {
2404                 struct auth_session_info *session_info =
2405                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2406                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2407                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2408                                         ldb_dn_get_linearized(old_msg->dn));
2409                         return LDB_ERR_UNWILLING_TO_PERFORM;
2410                 }
2411
2412                 /* it is already deleted - really remove it this time */
2413                 talloc_free(tmp_ctx);
2414                 return ldb_next_request(module, req);
2415         }
2416
2417         rdn_name = ldb_dn_get_rdn_name(old_dn);
2418         rdn_value = ldb_dn_get_rdn_val(old_dn);
2419
2420         msg = ldb_msg_new(tmp_ctx);
2421         if (msg == NULL) {
2422                 ldb_module_oom(module);
2423                 talloc_free(tmp_ctx);
2424                 return LDB_ERR_OPERATIONS_ERROR;
2425         }
2426
2427         msg->dn = old_dn;
2428
2429         if (deletion_state == OBJECT_NOT_DELETED){
2430                 /* work out where we will be renaming this object to */
2431                 ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2432                 if (ret != LDB_SUCCESS) {
2433                         /* this is probably an attempted delete on a partition
2434                          * that doesn't allow delete operations, such as the
2435                          * schema partition */
2436                         ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2437                                                    ldb_dn_get_linearized(old_dn));
2438                         talloc_free(tmp_ctx);
2439                         return LDB_ERR_UNWILLING_TO_PERFORM;
2440                 }
2441
2442                 /* get the objects GUID from the search we just did */
2443                 guid = samdb_result_guid(old_msg, "objectGUID");
2444
2445                 /* Add a formatted child */
2446                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2447                                                 rdn_name,
2448                                                 rdn_value->data,
2449                                                 GUID_string(tmp_ctx, &guid));
2450                 if (!retb) {
2451                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2452                                         ldb_dn_get_linearized(new_dn)));
2453                         talloc_free(tmp_ctx);
2454                         return LDB_ERR_OPERATIONS_ERROR;
2455                 }
2456
2457                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2458                 if (ret != LDB_SUCCESS) {
2459                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2460                         ldb_module_oom(module);
2461                         talloc_free(tmp_ctx);
2462                         return ret;
2463                 }
2464                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2465         }
2466
2467         /*
2468           now we need to modify the object in the following ways:
2469
2470           - add isDeleted=TRUE
2471           - update rDN and name, with new rDN
2472           - remove linked attributes
2473           - remove objectCategory and sAMAccountType
2474           - remove attribs not on the preserved list
2475              - preserved if in above list, or is rDN
2476           - remove all linked attribs from this object
2477           - remove all links from other objects to this object
2478           - add lastKnownParent
2479           - update replPropertyMetaData?
2480
2481           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2482          */
2483
2484         /* we need the storage form of the parent GUID */
2485         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2486                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2487                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2488                                     DSDB_SEARCH_REVEAL_INTERNALS|
2489                                     DSDB_SEARCH_SHOW_DELETED);
2490         if (ret != LDB_SUCCESS) {
2491                 talloc_free(tmp_ctx);
2492                 return ret;
2493         }
2494
2495         if (deletion_state == OBJECT_NOT_DELETED){
2496                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2497                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2498                 if (ret != LDB_SUCCESS) {
2499                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2500                         ldb_module_oom(module);
2501                         talloc_free(tmp_ctx);
2502                         return ret;
2503                 }
2504                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2505         }
2506
2507         switch (next_deletion_state){
2508
2509         case OBJECT_DELETED:
2510
2511                 ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
2512                 if (ret != LDB_SUCCESS) {
2513                         DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
2514                         ldb_module_oom(module);
2515                         talloc_free(tmp_ctx);
2516                         return ret;
2517                 }
2518                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2519
2520                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_DELETE, NULL);
2521                 if (ret != LDB_SUCCESS) {
2522                         talloc_free(tmp_ctx);
2523                         ldb_module_oom(module);
2524                         return ret;
2525                 }
2526
2527                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_DELETE, NULL);
2528                 if (ret != LDB_SUCCESS) {
2529                         talloc_free(tmp_ctx);
2530                         ldb_module_oom(module);
2531                         return ret;
2532                 }
2533
2534                 break;
2535
2536         case OBJECT_RECYCLED:
2537         case OBJECT_TOMBSTONE:
2538
2539                 /* we also mark it as recycled, meaning this object can't be
2540                    recovered (we are stripping its attributes) */
2541                 if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2542                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2543                         if (ret != LDB_SUCCESS) {
2544                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2545                                 ldb_module_oom(module);
2546                                 talloc_free(tmp_ctx);
2547                                 return ret;
2548                         }
2549                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2550                 }
2551
2552                 /* work out which of the old attributes we will be removing */
2553                 for (i=0; i<old_msg->num_elements; i++) {
2554                         const struct dsdb_attribute *sa;
2555                         el = &old_msg->elements[i];
2556                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2557                         if (!sa) {
2558                                 talloc_free(tmp_ctx);
2559                                 return LDB_ERR_OPERATIONS_ERROR;
2560                         }
2561                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2562                                 /* don't remove the rDN */
2563                                 continue;
2564                         }
2565                         if (sa->linkID && sa->linkID & 1) {
2566                         ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2567                                 if (ret != LDB_SUCCESS) {
2568                                         talloc_free(tmp_ctx);
2569                                         return LDB_ERR_OPERATIONS_ERROR;
2570                                 }
2571                                 continue;
2572                         }
2573                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2574                                 continue;
2575                         }
2576                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2577                         if (ret != LDB_SUCCESS) {
2578                                 talloc_free(tmp_ctx);
2579                                 ldb_module_oom(module);
2580                                 return ret;
2581                         }
2582                 }
2583                 break;
2584
2585         default:
2586                 break;
2587         }
2588
2589         if (deletion_state == OBJECT_NOT_DELETED) {
2590                 /* work out what the new rdn value is, for updating the
2591                    rDN and name fields */
2592                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2593
2594                 ret = ldb_msg_add_value(msg, strlower_talloc(tmp_ctx, rdn_name), new_rdn_value, &el);
2595                 if (ret != LDB_SUCCESS) {
2596                         talloc_free(tmp_ctx);
2597                         return ret;
2598                 }
2599                 el->flags = LDB_FLAG_MOD_REPLACE;
2600
2601                 el = ldb_msg_find_element(old_msg, "name");
2602                 if (el) {
2603                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2604                         if (ret != LDB_SUCCESS) {
2605                                 talloc_free(tmp_ctx);
2606                                 return ret;
2607                         }
2608                         el->flags = LDB_FLAG_MOD_REPLACE;
2609                 }
2610         }
2611
2612         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2613         if (ret != LDB_SUCCESS) {
2614                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2615                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2616                 talloc_free(tmp_ctx);
2617                 return ret;
2618         }
2619
2620         if (deletion_state == OBJECT_NOT_DELETED) {
2621                 /* now rename onto the new DN */
2622                 ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2623                 if (ret != LDB_SUCCESS){
2624                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2625                                  ldb_dn_get_linearized(old_dn),
2626                                  ldb_dn_get_linearized(new_dn),
2627                                  ldb_errstring(ldb)));
2628                         talloc_free(tmp_ctx);
2629                         return ret;
2630                 }
2631         }
2632
2633         talloc_free(tmp_ctx);
2634
2635         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2636 }
2637
2638
2639
2640 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2641 {
2642         return ret;
2643 }
2644
2645 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2646 {
2647         int ret = LDB_ERR_OTHER;
2648         /* TODO: do some error mapping */
2649         return ret;
2650 }
2651
2652 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2653 {
2654         struct ldb_context *ldb;
2655         struct ldb_request *change_req;
2656         enum ndr_err_code ndr_err;
2657         struct ldb_message *msg;
2658         struct replPropertyMetaDataBlob *md;
2659         struct ldb_val md_value;
2660         unsigned int i;
2661         int ret;
2662
2663         /*
2664          * TODO: check if the parent object exist
2665          */
2666
2667         /*
2668          * TODO: handle the conflict case where an object with the
2669          *       same name exist
2670          */
2671
2672         ldb = ldb_module_get_ctx(ar->module);
2673         msg = ar->objs->objects[ar->index_current].msg;
2674         md = ar->objs->objects[ar->index_current].meta_data;
2675
2676         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2677         if (ret != LDB_SUCCESS) {
2678                 return replmd_replicated_request_error(ar, ret);
2679         }
2680
2681         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2682         if (ret != LDB_SUCCESS) {
2683                 return replmd_replicated_request_error(ar, ret);
2684         }
2685
2686         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2687         if (ret != LDB_SUCCESS) {
2688                 return replmd_replicated_request_error(ar, ret);
2689         }
2690
2691         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2692         if (ret != LDB_SUCCESS) {
2693                 return replmd_replicated_request_error(ar, ret);
2694         }
2695
2696         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2697         if (ret != LDB_SUCCESS) {
2698                 return replmd_replicated_request_error(ar, ret);
2699         }
2700
2701         /* remove any message elements that have zero values */
2702         for (i=0; i<msg->num_elements; i++) {
2703                 struct ldb_message_element *el = &msg->elements[i];
2704
2705                 if (el->num_values == 0) {
2706                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2707                                  el->name));
2708                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2709                         msg->num_elements--;
2710                         i--;
2711                         continue;
2712                 }
2713         }
2714
2715         /*
2716          * the meta data array is already sorted by the caller
2717          */
2718         for (i=0; i < md->ctr.ctr1.count; i++) {
2719                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2720         }
2721         ndr_err = ndr_push_struct_blob(&md_value, msg,
2722                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2723                                        md,
2724                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2725         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2726                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2727                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2728         }
2729         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2730         if (ret != LDB_SUCCESS) {
2731                 return replmd_replicated_request_error(ar, ret);
2732         }
2733
2734         replmd_ldb_message_sort(msg, ar->schema);
2735
2736         if (DEBUGLVL(4)) {
2737                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2738                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2739                 talloc_free(s);
2740         }
2741
2742         ret = ldb_build_add_req(&change_req,
2743                                 ldb,
2744                                 ar,
2745                                 msg,
2746                                 ar->controls,
2747                                 ar,
2748                                 replmd_op_callback,
2749                                 ar->req);
2750         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2751
2752         return ldb_next_request(ar->module, change_req);
2753 }
2754
2755 /*
2756    return true if an update is newer than an existing entry
2757    see section 5.11 of MS-ADTS
2758 */
2759 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2760                                    const struct GUID *update_invocation_id,
2761                                    uint32_t current_version,
2762                                    uint32_t update_version,
2763                                    NTTIME current_change_time,
2764                                    NTTIME update_change_time)
2765 {
2766         if (update_version != current_version) {
2767                 return update_version > current_version;
2768         }
2769         if (update_change_time > current_change_time) {
2770                 return true;
2771         }
2772         if (update_change_time == current_change_time) {
2773                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2774         }
2775         return false;
2776 }
2777
2778 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2779                                                   struct replPropertyMetaData1 *new_m)
2780 {
2781         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2782                                       &new_m->originating_invocation_id,
2783                                       cur_m->version,
2784                                       new_m->version,
2785                                       cur_m->originating_change_time,
2786                                       new_m->originating_change_time);
2787 }
2788
2789 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2790 {
2791         struct ldb_context *ldb;
2792         struct ldb_request *change_req;
2793         enum ndr_err_code ndr_err;
2794         struct ldb_message *msg;
2795         struct replPropertyMetaDataBlob *rmd;
2796         struct replPropertyMetaDataBlob omd;
2797         const struct ldb_val *omd_value;
2798         struct replPropertyMetaDataBlob nmd;
2799         struct ldb_val nmd_value;
2800         unsigned int i;
2801         uint32_t j,ni=0;
2802         unsigned int removed_attrs = 0;
2803         int ret;
2804
2805         ldb = ldb_module_get_ctx(ar->module);
2806         msg = ar->objs->objects[ar->index_current].msg;
2807         rmd = ar->objs->objects[ar->index_current].meta_data;
2808         ZERO_STRUCT(omd);
2809         omd.version = 1;
2810
2811         /*
2812          * TODO: check repl data is correct after a rename
2813          */
2814         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2815                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2816                           ldb_dn_get_linearized(ar->search_msg->dn),
2817                           ldb_dn_get_linearized(msg->dn));
2818                 if (dsdb_module_rename(ar->module,
2819                                        ar->search_msg->dn, msg->dn,
2820                                        DSDB_FLAG_OWN_MODULE) != LDB_SUCCESS) {
2821                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2822                                   ldb_dn_get_linearized(ar->search_msg->dn),
2823                                   ldb_dn_get_linearized(msg->dn),
2824                                   ldb_errstring(ldb));
2825                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2826                 }
2827         }
2828
2829         /* find existing meta data */
2830         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2831         if (omd_value) {
2832                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
2833                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
2834                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2835                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2836                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2837                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2838                 }
2839
2840                 if (omd.version != 1) {
2841                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2842                 }
2843         }
2844
2845         ZERO_STRUCT(nmd);
2846         nmd.version = 1;
2847         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2848         nmd.ctr.ctr1.array = talloc_array(ar,
2849                                           struct replPropertyMetaData1,
2850                                           nmd.ctr.ctr1.count);
2851         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2852
2853         /* first copy the old meta data */
2854         for (i=0; i < omd.ctr.ctr1.count; i++) {
2855                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2856                 ni++;
2857         }
2858
2859         /* now merge in the new meta data */
2860         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2861                 bool found = false;
2862
2863                 for (j=0; j < ni; j++) {
2864                         bool cmp;
2865
2866                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2867                                 continue;
2868                         }
2869
2870                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2871                                                                     &rmd->ctr.ctr1.array[i]);
2872                         if (cmp) {
2873                                 /* replace the entry */
2874                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2875                                 found = true;
2876                                 break;
2877                         }
2878
2879                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
2880                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
2881                                          msg->elements[i-removed_attrs].name,
2882                                          ldb_dn_get_linearized(msg->dn),
2883                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2884                         }
2885
2886                         /* we don't want to apply this change so remove the attribute */
2887                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2888                         removed_attrs++;
2889
2890                         found = true;
2891                         break;
2892                 }
2893
2894                 if (found) continue;
2895
2896                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2897                 ni++;
2898         }
2899
2900         /*
2901          * finally correct the size of the meta_data array
2902          */
2903         nmd.ctr.ctr1.count = ni;
2904
2905         /*
2906          * the rdn attribute (the alias for the name attribute),
2907          * 'cn' for most objects is the last entry in the meta data array
2908          * we have stored
2909          *
2910          * sort the new meta data array
2911          */
2912         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2913         if (ret != LDB_SUCCESS) {
2914                 return ret;
2915         }
2916
2917         /*
2918          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2919          */
2920         if (msg->num_elements == 0) {
2921                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2922                           ar->index_current);
2923
2924                 ar->index_current++;
2925                 return replmd_replicated_apply_next(ar);
2926         }
2927
2928         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2929                   ar->index_current, msg->num_elements);
2930
2931         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2932         if (ret != LDB_SUCCESS) {
2933                 return replmd_replicated_request_error(ar, ret);
2934         }
2935
2936         for (i=0; i<ni; i++) {
2937                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2938         }
2939
2940         /* create the meta data value */
2941         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
2942                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2943                                        &nmd,
2944                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2945         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2946                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2947                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2948         }
2949
2950         /*
2951          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2952          * and replPopertyMetaData attributes
2953          */
2954         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2955         if (ret != LDB_SUCCESS) {
2956                 return replmd_replicated_request_error(ar, ret);
2957         }
2958         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2959         if (ret != LDB_SUCCESS) {
2960                 return replmd_replicated_request_error(ar, ret);
2961         }
2962         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2963         if (ret != LDB_SUCCESS) {
2964                 return replmd_replicated_request_error(ar, ret);
2965         }
2966
2967         replmd_ldb_message_sort(msg, ar->schema);
2968
2969         /* we want to replace the old values */
2970         for (i=0; i < msg->num_elements; i++) {
2971                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
2972         }
2973
2974         if (DEBUGLVL(4)) {
2975                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
2976                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
2977                 talloc_free(s);
2978         }
2979
2980         ret = ldb_build_mod_req(&change_req,
2981                                 ldb,
2982                                 ar,
2983                                 msg,
2984                                 ar->controls,
2985                                 ar,
2986                                 replmd_op_callback,
2987                                 ar->req);
2988         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2989
2990         return ldb_next_request(ar->module, change_req);
2991 }
2992
2993 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
2994                                                    struct ldb_reply *ares)
2995 {
2996         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2997                                                struct replmd_replicated_request);
2998         int ret;
2999
3000         if (!ares) {
3001                 return ldb_module_done(ar->req, NULL, NULL,
3002                                         LDB_ERR_OPERATIONS_ERROR);
3003         }
3004         if (ares->error != LDB_SUCCESS &&
3005             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3006                 return ldb_module_done(ar->req, ares->controls,
3007                                         ares->response, ares->error);
3008         }
3009
3010         switch (ares->type) {
3011         case LDB_REPLY_ENTRY:
3012                 ar->search_msg = talloc_steal(ar, ares->message);
3013                 break;
3014
3015         case LDB_REPLY_REFERRAL:
3016                 /* we ignore referrals */
3017                 break;
3018
3019         case LDB_REPLY_DONE:
3020                 if (ar->search_msg != NULL) {
3021                         ret = replmd_replicated_apply_merge(ar);
3022                 } else {
3023                         ret = replmd_replicated_apply_add(ar);
3024                 }
3025                 if (ret != LDB_SUCCESS) {
3026                         return ldb_module_done(ar->req, NULL, NULL, ret);
3027                 }
3028         }
3029
3030         talloc_free(ares);
3031         return LDB_SUCCESS;
3032 }
3033
3034 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
3035
3036 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
3037 {
3038         struct ldb_context *ldb;
3039         int ret;
3040         char *tmp_str;
3041         char *filter;
3042         struct ldb_request *search_req;
3043         struct ldb_search_options_control *options;
3044
3045         if (ar->index_current >= ar->objs->num_objects) {
3046                 /* done with it, go to next stage */
3047                 return replmd_replicated_uptodate_vector(ar);
3048         }
3049
3050         ldb = ldb_module_get_ctx(ar->module);
3051         ar->search_msg = NULL;
3052
3053         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
3054         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3055
3056         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
3057         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3058         talloc_free(tmp_str);
3059
3060         ret = ldb_build_search_req(&search_req,
3061                                    ldb,
3062                                    ar,
3063                                    NULL,
3064                                    LDB_SCOPE_SUBTREE,
3065                                    filter,
3066                                    NULL,
3067                                    NULL,
3068                                    ar,
3069                                    replmd_replicated_apply_search_callback,
3070                                    ar->req);
3071
3072         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
3073         if (ret != LDB_SUCCESS) {
3074                 return ret;
3075         }
3076
3077         /* we need to cope with cross-partition links, so search for
3078            the GUID over all partitions */
3079         options = talloc(search_req, struct ldb_search_options_control);
3080         if (options == NULL) {
3081                 DEBUG(0, (__location__ ": out of memory\n"));
3082                 return LDB_ERR_OPERATIONS_ERROR;
3083         }
3084         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
3085
3086         ret = ldb_request_add_control(search_req,
3087                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
3088                                       true, options);
3089         if (ret != LDB_SUCCESS) {
3090                 return ret;
3091         }
3092
3093         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3094
3095         return ldb_next_request(ar->module, search_req);
3096 }
3097
3098 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
3099                                                       struct ldb_reply *ares)
3100 {
3101         struct ldb_context *ldb;
3102         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3103                                                struct replmd_replicated_request);
3104         ldb = ldb_module_get_ctx(ar->module);
3105
3106         if (!ares) {
3107                 return ldb_module_done(ar->req, NULL, NULL,
3108                                         LDB_ERR_OPERATIONS_ERROR);
3109         }
3110         if (ares->error != LDB_SUCCESS) {
3111                 return ldb_module_done(ar->req, ares->controls,
3112                                         ares->response, ares->error);
3113         }
3114
3115         if (ares->type != LDB_REPLY_DONE) {
3116                 ldb_set_errstring(ldb, "Invalid reply type\n!");
3117                 return ldb_module_done(ar->req, NULL, NULL,
3118                                         LDB_ERR_OPERATIONS_ERROR);
3119         }
3120
3121         talloc_free(ares);
3122
3123         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3124 }
3125
3126 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3127 {
3128         struct ldb_context *ldb;
3129         struct ldb_request *change_req;
3130         enum ndr_err_code ndr_err;
3131         struct ldb_message *msg;
3132         struct replUpToDateVectorBlob ouv;
3133         const struct ldb_val *ouv_value;
3134         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3135         struct replUpToDateVectorBlob nuv;
3136         struct ldb_val nuv_value;
3137         struct ldb_message_element *nuv_el = NULL;
3138         const struct GUID *our_invocation_id;
3139         struct ldb_message_element *orf_el = NULL;
3140         struct repsFromToBlob nrf;
3141         struct ldb_val *nrf_value = NULL;
3142         struct ldb_message_element *nrf_el = NULL;
3143         unsigned int i;
3144         uint32_t j,ni=0;
3145         bool found = false;
3146         time_t t = time(NULL);
3147         NTTIME now;
3148         int ret;
3149
3150         ldb = ldb_module_get_ctx(ar->module);
3151         ruv = ar->objs->uptodateness_vector;
3152         ZERO_STRUCT(ouv);
3153         ouv.version = 2;
3154         ZERO_STRUCT(nuv);
3155         nuv.version = 2;
3156
3157         unix_to_nt_time(&now, t);
3158
3159         /*
3160          * first create the new replUpToDateVector
3161          */
3162         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3163         if (ouv_value) {
3164                 ndr_err = ndr_pull_struct_blob(ouv_value, ar,
3165                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
3166                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3167                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3168                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3169                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3170                 }
3171
3172                 if (ouv.version != 2) {
3173                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3174                 }
3175         }
3176
3177         /*
3178          * the new uptodateness vector will at least
3179          * contain 1 entry, one for the source_dsa
3180          *
3181          * plus optional values from our old vector and the one from the source_dsa
3182          */
3183         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3184         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3185         nuv.ctr.ctr2.cursors = talloc_array(ar,
3186                                             struct drsuapi_DsReplicaCursor2,
3187                                             nuv.ctr.ctr2.count);
3188         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3189
3190         /* first copy the old vector */
3191         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3192                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3193                 ni++;
3194         }
3195
3196         /* get our invocation_id if we have one already attached to the ldb */
3197         our_invocation_id = samdb_ntds_invocation_id(ldb);
3198
3199         /* merge in the source_dsa vector is available */
3200         for (i=0; (ruv && i < ruv->count); i++) {
3201                 found = false;
3202
3203                 if (our_invocation_id &&
3204                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3205                                our_invocation_id)) {
3206                         continue;
3207                 }
3208
3209                 for (j=0; j < ni; j++) {
3210                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3211                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3212                                 continue;
3213                         }
3214
3215                         found = true;
3216
3217                         /*
3218                          * we update only the highest_usn and not the latest_sync_success time,
3219                          * because the last success stands for direct replication
3220                          */
3221                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3222                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3223                         }
3224                         break;
3225                 }
3226
3227                 if (found) continue;
3228
3229                 /* if it's not there yet, add it */
3230                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3231                 ni++;
3232         }
3233
3234         /*
3235          * merge in the current highwatermark for the source_dsa
3236          */
3237         found = false;
3238         for (j=0; j < ni; j++) {
3239                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3240                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3241                         continue;
3242                 }
3243
3244                 found = true;
3245
3246                 /*
3247                  * here we update the highest_usn and last_sync_success time
3248                  * because we're directly replicating from the source_dsa
3249                  *
3250                  * and use the tmp_highest_usn because this is what we have just applied
3251                  * to our ldb
3252                  */
3253                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3254                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3255                 break;
3256         }
3257         if (!found) {
3258                 /*
3259                  * here we update the highest_usn and last_sync_success time
3260                  * because we're directly replicating from the source_dsa
3261                  *
3262                  * and use the tmp_highest_usn because this is what we have just applied
3263                  * to our ldb
3264                  */
3265                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3266                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3267                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3268                 ni++;
3269         }
3270
3271         /*
3272          * finally correct the size of the cursors array
3273          */
3274         nuv.ctr.ctr2.count = ni;
3275
3276         /*
3277          * sort the cursors
3278          */
3279         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
3280
3281         /*
3282          * create the change ldb_message
3283          */
3284         msg = ldb_msg_new(ar);
3285         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3286         msg->dn = ar->search_msg->dn;
3287
3288         ndr_err = ndr_push_struct_blob(&nuv_value, msg,
3289                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3290                                        &nuv,
3291                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3292         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3293                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3294                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3295         }
3296         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3297         if (ret != LDB_SUCCESS) {
3298                 return replmd_replicated_request_error(ar, ret);
3299         }
3300         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3301
3302         /*
3303          * now create the new repsFrom value from the given repsFromTo1 structure
3304          */
3305         ZERO_STRUCT(nrf);
3306         nrf.version                                     = 1;
3307         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3308         /* and fix some values... */
3309         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3310         nrf.ctr.ctr1.last_success                       = now;
3311         nrf.ctr.ctr1.last_attempt                       = now;
3312         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3313         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3314
3315         /*
3316          * first see if we already have a repsFrom value for the current source dsa
3317          * if so we'll later replace this value
3318          */
3319         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3320         if (orf_el) {
3321                 for (i=0; i < orf_el->num_values; i++) {
3322                         struct repsFromToBlob *trf;
3323
3324                         trf = talloc(ar, struct repsFromToBlob);
3325                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3326
3327                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
3328                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3329                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3330                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3331                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3332                         }
3333
3334                         if (trf->version != 1) {
3335                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3336                         }
3337
3338                         /*
3339                          * we compare the source dsa objectGUID not the invocation_id
3340                          * because we want only one repsFrom value per source dsa
3341                          * and when the invocation_id of the source dsa has changed we don't need
3342                          * the old repsFrom with the old invocation_id
3343                          */
3344                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3345                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3346                                 talloc_free(trf);
3347                                 continue;
3348                         }
3349
3350                         talloc_free(trf);
3351                         nrf_value = &orf_el->values[i];
3352                         break;
3353                 }
3354
3355                 /*
3356                  * copy over all old values to the new ldb_message
3357                  */
3358                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3359                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3360                 *nrf_el = *orf_el;
3361         }
3362
3363         /*
3364          * if we haven't found an old repsFrom value for the current source dsa
3365          * we'll add a new value
3366          */
3367         if (!nrf_value) {
3368                 struct ldb_val zero_value;
3369                 ZERO_STRUCT(zero_value);
3370                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3371                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3372
3373                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3374         }
3375
3376         /* we now fill the value which is already attached to ldb_message */
3377         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3378                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3379                                        &nrf,
3380                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3381         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3382                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3383                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3384         }
3385
3386         /*
3387          * the ldb_message_element for the attribute, has all the old values and the new one
3388          * so we'll replace the whole attribute with all values
3389          */
3390         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3391
3392         if (DEBUGLVL(4)) {
3393                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3394                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3395                 talloc_free(s);
3396         }
3397
3398         /* prepare the ldb_modify() request */
3399         ret = ldb_build_mod_req(&change_req,
3400                                 ldb,
3401                                 ar,
3402                                 msg,
3403                                 ar->controls,
3404                                 ar,
3405                                 replmd_replicated_uptodate_modify_callback,
3406                                 ar->req);
3407         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3408
3409         return ldb_next_request(ar->module, change_req);
3410 }
3411
3412 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3413                                                       struct ldb_reply *ares)
3414 {
3415         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3416                                                struct replmd_replicated_request);
3417         int ret;
3418
3419         if (!ares) {
3420                 return ldb_module_done(ar->req, NULL, NULL,
3421                                         LDB_ERR_OPERATIONS_ERROR);
3422         }
3423         if (ares->error != LDB_SUCCESS &&
3424             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3425                 return ldb_module_done(ar->req, ares->controls,
3426                                         ares->response, ares->error);
3427         }
3428
3429         switch (ares->type) {
3430         case LDB_REPLY_ENTRY:
3431                 ar->search_msg = talloc_steal(ar, ares->message);
3432                 break;
3433
3434         case LDB_REPLY_REFERRAL:
3435                 /* we ignore referrals */
3436                 break;
3437
3438         case LDB_REPLY_DONE:
3439                 if (ar->search_msg == NULL) {
3440                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3441                 } else {
3442                         ret = replmd_replicated_uptodate_modify(ar);
3443                 }
3444                 if (ret != LDB_SUCCESS) {
3445                         return ldb_module_done(ar->req, NULL, NULL, ret);
3446                 }
3447         }
3448
3449         talloc_free(ares);
3450         return LDB_SUCCESS;
3451 }
3452
3453
3454 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3455 {
3456         struct ldb_context *ldb;
3457         int ret;
3458         static const char *attrs[] = {
3459                 "replUpToDateVector",
3460                 "repsFrom",
3461                 NULL
3462         };
3463         struct ldb_request *search_req;
3464
3465         ldb = ldb_module_get_ctx(ar->module);
3466         ar->search_msg = NULL;
3467
3468         ret = ldb_build_search_req(&search_req,
3469                                    ldb,
3470                                    ar,
3471                                    ar->objs->partition_dn,
3472                                    LDB_SCOPE_BASE,
3473                                    "(objectClass=*)",
3474                                    attrs,
3475                                    NULL,
3476                                    ar,
3477                                    replmd_replicated_uptodate_search_callback,
3478                                    ar->req);
3479         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3480
3481         return ldb_next_request(ar->module, search_req);
3482 }
3483
3484
3485
3486 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3487 {
3488         struct ldb_context *ldb;
3489         struct dsdb_extended_replicated_objects *objs;
3490         struct replmd_replicated_request *ar;
3491         struct ldb_control **ctrls;
3492         int ret;
3493         uint32_t i;
3494         struct replmd_private *replmd_private =
3495                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3496
3497         ldb = ldb_module_get_ctx(module);
3498
3499         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3500
3501         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3502         if (!objs) {
3503                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3504                 return LDB_ERR_PROTOCOL_ERROR;
3505         }
3506
3507         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3508                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3509                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3510                 return LDB_ERR_PROTOCOL_ERROR;
3511         }
3512
3513         ar = replmd_ctx_init(module, req);
3514         if (!ar)
3515                 return LDB_ERR_OPERATIONS_ERROR;
3516
3517         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3518         ar->apply_mode = true;
3519         ar->objs = objs;
3520         ar->schema = dsdb_get_schema(ldb, ar);
3521         if (!ar->schema) {
3522                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3523                 talloc_free(ar);
3524                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3525                 return LDB_ERR_CONSTRAINT_VIOLATION;
3526         }
3527
3528         ctrls = req->controls;
3529
3530         if (req->controls) {
3531                 req->controls = talloc_memdup(ar, req->controls,
3532                                               talloc_get_size(req->controls));
3533                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3534         }
3535
3536         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3537         if (ret != LDB_SUCCESS) {
3538                 return ret;
3539         }
3540
3541         ar->controls = req->controls;
3542         req->controls = ctrls;
3543
3544         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3545
3546         /* save away the linked attributes for the end of the
3547            transaction */
3548         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3549                 struct la_entry *la_entry;
3550
3551                 if (replmd_private->la_ctx == NULL) {
3552                         replmd_private->la_ctx = talloc_new(replmd_private);
3553                 }
3554                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3555                 if (la_entry == NULL) {
3556                         ldb_oom(ldb);
3557                         return LDB_ERR_OPERATIONS_ERROR;
3558                 }
3559                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3560                 if (la_entry->la == NULL) {
3561                         talloc_free(la_entry);
3562                         ldb_oom(ldb);
3563                         return LDB_ERR_OPERATIONS_ERROR;
3564                 }
3565                 *la_entry->la = ar->objs->linked_attributes[i];
3566
3567                 /* we need to steal the non-scalars so they stay
3568                    around until the end of the transaction */
3569                 talloc_steal(la_entry->la, la_entry->la->identifier);
3570                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3571
3572                 DLIST_ADD(replmd_private->la_list, la_entry);
3573         }
3574
3575         return replmd_replicated_apply_next(ar);
3576 }
3577
3578 /*
3579   process one linked attribute structure
3580  */
3581 static int replmd_process_linked_attribute(struct ldb_module *module,
3582                                            struct la_entry *la_entry)
3583 {
3584         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3585         struct ldb_context *ldb = ldb_module_get_ctx(module);
3586         struct ldb_message *msg;
3587         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3588         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
3589         int ret;
3590         const struct dsdb_attribute *attr;
3591         struct dsdb_dn *dsdb_dn;
3592         uint64_t seq_num = 0;
3593         struct ldb_message_element *old_el;
3594         WERROR status;
3595         time_t t = time(NULL);
3596         struct ldb_result *res;
3597         const char *attrs[2];
3598         struct parsed_dn *pdn_list, *pdn;
3599         struct GUID guid = GUID_zero();
3600         NTSTATUS ntstatus;
3601         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3602         const struct GUID *our_invocation_id;
3603
3604 /*
3605 linked_attributes[0]:
3606      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3607         identifier               : *
3608             identifier: struct drsuapi_DsReplicaObjectIdentifier
3609                 __ndr_size               : 0x0000003a (58)
3610                 __ndr_size_sid           : 0x00000000 (0)
3611                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3612                 sid                      : S-0-0
3613                 __ndr_size_dn            : 0x00000000 (0)
3614                 dn                       : ''
3615         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3616         value: struct drsuapi_DsAttributeValue
3617             __ndr_size               : 0x0000007e (126)
3618             blob                     : *
3619                 blob                     : DATA_BLOB length=126
3620         flags                    : 0x00000001 (1)
3621                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3622         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3623         meta_data: struct drsuapi_DsReplicaMetaData
3624             version                  : 0x00000015 (21)
3625             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3626             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3627             originating_usn          : 0x000000000001e19c (123292)
3628
3629 (for cases where the link is to a normal DN)
3630      &target: struct drsuapi_DsReplicaObjectIdentifier3
3631         __ndr_size               : 0x0000007e (126)
3632         __ndr_size_sid           : 0x0000001c (28)
3633         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3634         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3635         __ndr_size_dn            : 0x00000022 (34)
3636         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3637  */
3638
3639         /* find the attribute being modified */
3640         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3641         if (attr == NULL) {
3642                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3643                 talloc_free(tmp_ctx);
3644                 return LDB_ERR_OPERATIONS_ERROR;
3645         }
3646
3647         attrs[0] = attr->lDAPDisplayName;
3648         attrs[1] = NULL;
3649
3650         /* get the existing message from the db for the object with
3651            this GUID, returning attribute being modified. We will then
3652            use this msg as the basis for a modify call */
3653         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3654                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3655                                  DSDB_SEARCH_SHOW_DELETED |
3656                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3657                                  DSDB_SEARCH_REVEAL_INTERNALS,
3658                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3659         if (ret != LDB_SUCCESS) {
3660                 talloc_free(tmp_ctx);
3661                 return ret;
3662         }
3663         if (res->count != 1) {
3664                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3665                                        GUID_string(tmp_ctx, &la->identifier->guid));
3666                 talloc_free(tmp_ctx);
3667                 return LDB_ERR_NO_SUCH_OBJECT;
3668         }
3669         msg = res->msgs[0];
3670
3671         if (msg->num_elements == 0) {
3672                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3673                 if (ret != LDB_SUCCESS) {
3674                         ldb_module_oom(module);
3675                         talloc_free(tmp_ctx);
3676                         return LDB_ERR_OPERATIONS_ERROR;
3677                 }
3678         } else {
3679                 old_el = &msg->elements[0];
3680                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3681         }
3682
3683         /* parse the existing links */
3684         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3685         if (ret != LDB_SUCCESS) {
3686                 talloc_free(tmp_ctx);
3687                 return ret;
3688         }
3689
3690         /* get our invocationId */
3691         our_invocation_id = samdb_ntds_invocation_id(ldb);
3692         if (!our_invocation_id) {
3693                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3694                 talloc_free(tmp_ctx);
3695                 return LDB_ERR_OPERATIONS_ERROR;
3696         }
3697
3698         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
3699         if (ret != LDB_SUCCESS) {
3700                 talloc_free(tmp_ctx);
3701                 return ret;
3702         }
3703
3704         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3705         if (!W_ERROR_IS_OK(status)) {
3706                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3707                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3708                 return LDB_ERR_OPERATIONS_ERROR;
3709         }
3710
3711         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3712         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3713                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3714                                        old_el->name,
3715                                        ldb_dn_get_linearized(dsdb_dn->dn),
3716                                        ldb_dn_get_linearized(msg->dn));
3717                 return LDB_ERR_OPERATIONS_ERROR;
3718         }
3719
3720         /* re-resolve the DN by GUID, as the DRS server may give us an
3721            old DN value */
3722         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
3723         if (ret != LDB_SUCCESS) {
3724                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s",
3725                          GUID_string(tmp_ctx, &guid),
3726                          ldb_dn_get_linearized(dsdb_dn->dn)));
3727         }
3728
3729         /* see if this link already exists */
3730         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3731         if (pdn != NULL) {
3732                 /* see if this update is newer than what we have already */
3733                 struct GUID invocation_id = GUID_zero();
3734                 uint32_t version = 0;
3735                 NTTIME change_time = 0;
3736                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3737
3738                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3739                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3740                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3741
3742                 if (!replmd_update_is_newer(&invocation_id,
3743                                             &la->meta_data.originating_invocation_id,
3744                                             version,
3745                                             la->meta_data.version,
3746                                             change_time,
3747                                             la->meta_data.originating_change_time)) {
3748                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3749                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3750                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3751                         talloc_free(tmp_ctx);
3752                         return LDB_SUCCESS;
3753                 }
3754
3755                 /* get a seq_num for this change */
3756                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3757                 if (ret != LDB_SUCCESS) {
3758                         talloc_free(tmp_ctx);
3759                         return ret;
3760                 }
3761
3762                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
3763                         /* remove the existing backlink */
3764                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3765                         if (ret != LDB_SUCCESS) {
3766                                 talloc_free(tmp_ctx);
3767                                 return ret;
3768                         }
3769                 }
3770
3771                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3772                                            &la->meta_data.originating_invocation_id,
3773                                            la->meta_data.originating_usn, seq_num,
3774                                            la->meta_data.originating_change_time,
3775                                            la->meta_data.version,
3776                                            !active);
3777                 if (ret != LDB_SUCCESS) {
3778                         talloc_free(tmp_ctx);
3779                         return ret;
3780                 }
3781
3782                 if (active) {
3783                         /* add the new backlink */
3784                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3785                         if (ret != LDB_SUCCESS) {
3786                                 talloc_free(tmp_ctx);
3787                                 return ret;
3788                         }
3789                 }
3790         } else {
3791                 /* get a seq_num for this change */
3792                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3793                 if (ret != LDB_SUCCESS) {
3794                         talloc_free(tmp_ctx);
3795                         return ret;
3796                 }
3797
3798                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3799                                                 struct ldb_val, old_el->num_values+1);
3800                 if (!old_el->values) {
3801                         ldb_module_oom(module);
3802                         return LDB_ERR_OPERATIONS_ERROR;
3803                 }
3804                 old_el->num_values++;
3805
3806                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3807                                           &la->meta_data.originating_invocation_id,
3808                                           la->meta_data.originating_usn, seq_num,
3809                                           la->meta_data.originating_change_time,
3810                                           la->meta_data.version,
3811                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3812                 if (ret != LDB_SUCCESS) {
3813                         talloc_free(tmp_ctx);
3814                         return ret;
3815                 }
3816
3817                 if (active) {
3818                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3819                                                   true, attr, false);
3820                         if (ret != LDB_SUCCESS) {
3821                                 talloc_free(tmp_ctx);
3822                                 return ret;
3823                         }
3824                 }
3825         }
3826
3827         /* we only change whenChanged and uSNChanged if the seq_num
3828            has changed */
3829         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3830                 talloc_free(tmp_ctx);
3831                 return LDB_ERR_OPERATIONS_ERROR;
3832         }
3833
3834         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3835                 talloc_free(tmp_ctx);
3836                 return LDB_ERR_OPERATIONS_ERROR;
3837         }
3838
3839         ret = dsdb_check_single_valued_link(attr, old_el);
3840         if (ret != LDB_SUCCESS) {
3841                 talloc_free(tmp_ctx);
3842                 return ret;
3843         }
3844
3845         ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
3846         if (ret != LDB_SUCCESS) {
3847                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
3848                           ldb_errstring(ldb),
3849                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
3850                 talloc_free(tmp_ctx);
3851                 return ret;
3852         }
3853
3854         talloc_free(tmp_ctx);
3855
3856         return ret;
3857 }
3858
3859 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
3860 {
3861         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
3862                 return replmd_extended_replicated_objects(module, req);
3863         }
3864
3865         return ldb_next_request(module, req);
3866 }
3867
3868
3869 /*
3870   we hook into the transaction operations to allow us to
3871   perform the linked attribute updates at the end of the whole
3872   transaction. This allows a forward linked attribute to be created
3873   before the object is created. During a vampire, w2k8 sends us linked
3874   attributes before the objects they are part of.
3875  */
3876 static int replmd_start_transaction(struct ldb_module *module)
3877 {
3878         /* create our private structure for this transaction */
3879         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
3880                                                                 struct replmd_private);
3881         replmd_txn_cleanup(replmd_private);
3882
3883         /* free any leftover mod_usn records from cancelled
3884            transactions */
3885         while (replmd_private->ncs) {
3886                 struct nc_entry *e = replmd_private->ncs;
3887                 DLIST_REMOVE(replmd_private->ncs, e);
3888                 talloc_free(e);
3889         }
3890
3891         return ldb_next_start_trans(module);
3892 }
3893
3894 /*
3895   on prepare commit we loop over our queued la_context structures and
3896   apply each of them
3897  */
3898 static int replmd_prepare_commit(struct ldb_module *module)
3899 {
3900         struct replmd_private *replmd_private =
3901                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3902         struct la_entry *la, *prev;
3903         struct la_backlink *bl;
3904         int ret;
3905
3906         /* walk the list backwards, to do the first entry first, as we
3907          * added the entries with DLIST_ADD() which puts them at the
3908          * start of the list */
3909         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
3910                 prev = DLIST_PREV(la);
3911                 DLIST_REMOVE(replmd_private->la_list, la);
3912                 ret = replmd_process_linked_attribute(module, la);
3913                 if (ret != LDB_SUCCESS) {
3914                         replmd_txn_cleanup(replmd_private);
3915                         return ret;
3916                 }
3917         }
3918
3919         /* process our backlink list, creating and deleting backlinks
3920            as necessary */
3921         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
3922                 ret = replmd_process_backlink(module, bl);
3923                 if (ret != LDB_SUCCESS) {
3924                         replmd_txn_cleanup(replmd_private);
3925                         return ret;
3926                 }
3927         }
3928
3929         replmd_txn_cleanup(replmd_private);
3930
3931         /* possibly change @REPLCHANGED */
3932         ret = replmd_notify_store(module);
3933         if (ret != LDB_SUCCESS) {
3934                 return ret;
3935         }
3936
3937         return ldb_next_prepare_commit(module);
3938 }
3939
3940 static int replmd_del_transaction(struct ldb_module *module)
3941 {
3942         struct replmd_private *replmd_private =
3943                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3944         replmd_txn_cleanup(replmd_private);
3945
3946         return ldb_next_del_trans(module);
3947 }
3948
3949
3950 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
3951         .name          = "repl_meta_data",
3952         .init_context      = replmd_init,
3953         .add               = replmd_add,
3954         .modify            = replmd_modify,
3955         .rename            = replmd_rename,
3956         .del               = replmd_delete,
3957         .extended          = replmd_extended,
3958         .start_transaction = replmd_start_transaction,
3959         .prepare_commit    = replmd_prepare_commit,
3960         .del_transaction   = replmd_del_transaction,
3961 };