source4/dsdb/samdb/ldb_modules/repl_meta_data.c

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