source4/dsdb/samdb/ldb_modules/repl_meta_data.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2004-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   8    Copyright (C) Matthieu Patou <mat@samba.org> 2010
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 /*
  25  *  Name: ldb
  26  *
  27  *  Component: ldb repl_meta_data module
  28  *
  29  *  Description: - add a unique objectGUID onto every new record,
  30  *               - handle whenCreated, whenChanged timestamps
  31  *               - handle uSNCreated, uSNChanged numbers
  32  *               - handle replPropertyMetaData attribute
  33  *
  34  *  Author: Simo Sorce
  35  *  Author: Stefan Metzmacher
  36  */
  37
  38 #include "includes.h"
  39 #include "ldb_module.h"
  40 #include "dsdb/samdb/samdb.h"
  41 #include "dsdb/common/proto.h"
  42 #include "../libds/common/flags.h"
  43 #include "librpc/gen_ndr/ndr_misc.h"
  44 #include "librpc/gen_ndr/ndr_drsuapi.h"
  45 #include "librpc/gen_ndr/ndr_drsblobs.h"
  46 #include "param/param.h"
  47 #include "libcli/security/security.h"
  48 #include "lib/util/dlinklist.h"
  49 #include "dsdb/samdb/ldb_modules/util.h"
  50 #include "lib/util/binsearch.h"
  51 #include "libcli/security/session.h"
  52 #include "lib/util/tsort.h"
  53
  54 struct replmd_private {
  55         TALLOC_CTX *la_ctx;
  56         struct la_entry *la_list;
  57         TALLOC_CTX *bl_ctx;
  58         struct la_backlink *la_backlinks;
  59         struct nc_entry {
  60                 struct nc_entry *prev, *next;
  61                 struct ldb_dn *dn;
  62                 uint64_t mod_usn;
  63                 uint64_t mod_usn_urgent;
  64         } *ncs;
  65 };
  66
  67 struct la_entry {
  68         struct la_entry *next, *prev;
  69         struct drsuapi_DsReplicaLinkedAttribute *la;
  70 };
  71
  72 struct replmd_replicated_request {
  73         struct ldb_module *module;
  74         struct ldb_request *req;
  75
  76         const struct dsdb_schema *schema;
  77
  78         /* the controls we pass down */
  79         struct ldb_control **controls;
  80
  81         /* details for the mode where we apply a bunch of inbound replication meessages */
  82         bool apply_mode;
  83         uint32_t index_current;
  84         struct dsdb_extended_replicated_objects *objs;
  85
  86         struct ldb_message *search_msg;
  87
  88         uint64_t seq_num;
  89         bool is_urgent;
  90 };
  91
  92 enum urgent_situation {
  93         REPL_URGENT_ON_CREATE = 1,
  94         REPL_URGENT_ON_UPDATE = 2,
  95         REPL_URGENT_ON_DELETE = 4
  96 };
  97
  98
  99 static const struct {
 100         const char *update_name;
 101         enum urgent_situation repl_situation;
 102 } urgent_objects[] = {
 103                 {"nTDSDSA", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 104                 {"crossRef", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 105                 {"attributeSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 106                 {"classSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 107                 {"secret", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 108                 {"rIDManager", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 109                 {NULL, 0}
 110 };
 111
 112 /* Attributes looked for when updating or deleting, to check for a urgent replication needed */
 113 static const char *urgent_attrs[] = {
 114                 "lockoutTime",
 115                 "pwdLastSet",
 116                 "userAccountControl",
 117                 NULL
 118 };
 119
 120
 121 static bool replmd_check_urgent_objectclass(const struct ldb_message_element *objectclass_el,
 122                                         enum urgent_situation situation)
 123 {
 124         unsigned int i, j;
 125         for (i=0; urgent_objects[i].update_name; i++) {
 126
 127                 if ((situation & urgent_objects[i].repl_situation) == 0) {
 128                         continue;
 129                 }
 130
 131                 for (j=0; j<objectclass_el->num_values; j++) {
 132                         const struct ldb_val *v = &objectclass_el->values[j];
 133                         if (ldb_attr_cmp((const char *)v->data, urgent_objects[i].update_name) == 0) {
 134                                 return true;
 135                         }
 136                 }
 137         }
 138         return false;
 139 }
 140
 141 static bool replmd_check_urgent_attribute(const struct ldb_message_element *el)
 142 {
 143         if (ldb_attr_in_list(urgent_attrs, el->name)) {
 144                 return true;
 145         }
 146         return false;
 147 }
 148
 149
 150 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
 151
 152 /*
 153   initialise the module
 154   allocate the private structure and build the list
 155   of partition DNs for use by replmd_notify()
 156  */
 157 static int replmd_init(struct ldb_module *module)
 158 {
 159         struct replmd_private *replmd_private;
 160         struct ldb_context *ldb = ldb_module_get_ctx(module);
 161
 162         replmd_private = talloc_zero(module, struct replmd_private);
 163         if (replmd_private == NULL) {
 164                 ldb_oom(ldb);
 165                 return LDB_ERR_OPERATIONS_ERROR;
 166         }
 167         ldb_module_set_private(module, replmd_private);
 168
 169         return ldb_next_init(module);
 170 }
 171
 172 /*
 173   cleanup our per-transaction contexts
 174  */
 175 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 176 {
 177         talloc_free(replmd_private->la_ctx);
 178         replmd_private->la_list = NULL;
 179         replmd_private->la_ctx = NULL;
 180
 181         talloc_free(replmd_private->bl_ctx);
 182         replmd_private->la_backlinks = NULL;
 183         replmd_private->bl_ctx = NULL;
 184 }
 185
 186
 187 struct la_backlink {
 188         struct la_backlink *next, *prev;
 189         const char *attr_name;
 190         struct GUID forward_guid, target_guid;
 191         bool active;
 192 };
 193
 194 /*
 195   process a backlinks we accumulated during a transaction, adding and
 196   deleting the backlinks from the target objects
 197  */
 198 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl, struct ldb_request *parent)
 199 {
 200         struct ldb_dn *target_dn, *source_dn;
 201         int ret;
 202         struct ldb_context *ldb = ldb_module_get_ctx(module);
 203         struct ldb_message *msg;
 204         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 205         char *dn_string;
 206
 207         /*
 208           - find DN of target
 209           - find DN of source
 210           - construct ldb_message
 211               - either an add or a delete
 212          */
 213         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn, parent);
 214         if (ret != LDB_SUCCESS) {
 215                 DEBUG(2,(__location__ ": WARNING: Failed to find target DN for linked attribute with GUID %s\n",
 216                          GUID_string(bl, &bl->target_guid)));
 217                 return LDB_SUCCESS;
 218         }
 219
 220         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn, parent);
 221         if (ret != LDB_SUCCESS) {
 222                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 223                                        GUID_string(bl, &bl->forward_guid));
 224                 talloc_free(tmp_ctx);
 225                 return ret;
 226         }
 227
 228         msg = ldb_msg_new(tmp_ctx);
 229         if (msg == NULL) {
 230                 ldb_module_oom(module);
 231                 talloc_free(tmp_ctx);
 232                 return LDB_ERR_OPERATIONS_ERROR;
 233         }
 234
 235         /* construct a ldb_message for adding/deleting the backlink */
 236         msg->dn = target_dn;
 237         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 238         if (!dn_string) {
 239                 ldb_module_oom(module);
 240                 talloc_free(tmp_ctx);
 241                 return LDB_ERR_OPERATIONS_ERROR;
 242         }
 243         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 244         if (ret != LDB_SUCCESS) {
 245                 talloc_free(tmp_ctx);
 246                 return ret;
 247         }
 248         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 249
 250         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE, parent);
 251         if (ret != LDB_SUCCESS) {
 252                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 253                                        bl->active?"add":"remove",
 254                                        ldb_dn_get_linearized(source_dn),
 255                                        ldb_dn_get_linearized(target_dn),
 256                                        ldb_errstring(ldb));
 257                 talloc_free(tmp_ctx);
 258                 return ret;
 259         }
 260         talloc_free(tmp_ctx);
 261         return ret;
 262 }
 263
 264 /*
 265   add a backlink to the list of backlinks to add/delete in the prepare
 266   commit
 267  */
 268 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 269                                struct GUID *forward_guid, struct GUID *target_guid,
 270                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 271 {
 272         const struct dsdb_attribute *target_attr;
 273         struct la_backlink *bl;
 274         struct replmd_private *replmd_private =
 275                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 276
 277         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 278         if (!target_attr) {
 279                 /*
 280                  * windows 2003 has a broken schema where the
 281                  * definition of msDS-IsDomainFor is missing (which is
 282                  * supposed to be the backlink of the
 283                  * msDS-HasDomainNCs attribute
 284                  */
 285                 return LDB_SUCCESS;
 286         }
 287
 288         /* see if its already in the list */
 289         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 290                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 291                     GUID_equal(target_guid, &bl->target_guid) &&
 292                     (target_attr->lDAPDisplayName == bl->attr_name ||
 293                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 294                         break;
 295                 }
 296         }
 297
 298         if (bl) {
 299                 /* we found an existing one */
 300                 if (bl->active == active) {
 301                         return LDB_SUCCESS;
 302                 }
 303                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 304                 talloc_free(bl);
 305                 return LDB_SUCCESS;
 306         }
 307
 308         if (replmd_private->bl_ctx == NULL) {
 309                 replmd_private->bl_ctx = talloc_new(replmd_private);
 310                 if (replmd_private->bl_ctx == NULL) {
 311                         ldb_module_oom(module);
 312                         return LDB_ERR_OPERATIONS_ERROR;
 313                 }
 314         }
 315
 316         /* its a new one */
 317         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 318         if (bl == NULL) {
 319                 ldb_module_oom(module);
 320                 return LDB_ERR_OPERATIONS_ERROR;
 321         }
 322
 323         /* Ensure the schema does not go away before the bl->attr_name is used */
 324         if (!talloc_reference(bl, schema)) {
 325                 talloc_free(bl);
 326                 ldb_module_oom(module);
 327                 return LDB_ERR_OPERATIONS_ERROR;
 328         }
 329
 330         bl->attr_name = target_attr->lDAPDisplayName;
 331         bl->forward_guid = *forward_guid;
 332         bl->target_guid = *target_guid;
 333         bl->active = active;
 334
 335         /* the caller may ask for this backlink to be processed
 336            immediately */
 337         if (immediate) {
 338                 int ret = replmd_process_backlink(module, bl, NULL);
 339                 talloc_free(bl);
 340                 return ret;
 341         }
 342
 343         DLIST_ADD(replmd_private->la_backlinks, bl);
 344
 345         return LDB_SUCCESS;
 346 }
 347
 348
 349 /*
 350  * Callback for most write operations in this module:
 351  *
 352  * notify the repl task that a object has changed. The notifies are
 353  * gathered up in the replmd_private structure then written to the
 354  * @REPLCHANGED object in each partition during the prepare_commit
 355  */
 356 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 357 {
 358         int ret;
 359         struct replmd_replicated_request *ac =
 360                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 361         struct replmd_private *replmd_private =
 362                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 363         struct nc_entry *modified_partition;
 364         struct ldb_control *partition_ctrl;
 365         const struct dsdb_control_current_partition *partition;
 366
 367         struct ldb_control **controls;
 368
 369         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 370
 371         /* Remove the 'partition' control from what we pass up the chain */
 372         controls = ldb_controls_except_specified(ares->controls, ares, partition_ctrl);
 373
 374         if (ares->error != LDB_SUCCESS) {
 375                 return ldb_module_done(ac->req, controls,
 376                                         ares->response, ares->error);
 377         }
 378
 379         if (ares->type != LDB_REPLY_DONE) {
 380                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 381                 return ldb_module_done(ac->req, NULL,
 382                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 383         }
 384
 385         if (!partition_ctrl) {
 386                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 387                 return ldb_module_done(ac->req, NULL,
 388                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 389         }
 390
 391         partition = talloc_get_type_abort(partition_ctrl->data,
 392                                     struct dsdb_control_current_partition);
 393
 394         if (ac->seq_num > 0) {
 395                 for (modified_partition = replmd_private->ncs; modified_partition;
 396                      modified_partition = modified_partition->next) {
 397                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 398                                 break;
 399                         }
 400                 }
 401
 402                 if (modified_partition == NULL) {
 403                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 404                         if (!modified_partition) {
 405                                 ldb_oom(ldb_module_get_ctx(ac->module));
 406                                 return ldb_module_done(ac->req, NULL,
 407                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 408                         }
 409                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 410                         if (!modified_partition->dn) {
 411                                 ldb_oom(ldb_module_get_ctx(ac->module));
 412                                 return ldb_module_done(ac->req, NULL,
 413                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 414                         }
 415                         DLIST_ADD(replmd_private->ncs, modified_partition);
 416                 }
 417
 418                 if (ac->seq_num > modified_partition->mod_usn) {
 419                         modified_partition->mod_usn = ac->seq_num;
 420                         if (ac->is_urgent) {
 421                                 modified_partition->mod_usn_urgent = ac->seq_num;
 422                         }
 423                 }
 424         }
 425
 426         if (ac->apply_mode) {
 427                 talloc_free(ares);
 428                 ac->index_current++;
 429
 430                 ret = replmd_replicated_apply_next(ac);
 431                 if (ret != LDB_SUCCESS) {
 432                         return ldb_module_done(ac->req, NULL, NULL, ret);
 433                 }
 434                 return ret;
 435         } else {
 436                 /* free the partition control container here, for the
 437                  * common path.  Other cases will have it cleaned up
 438                  * eventually with the ares */
 439                 talloc_free(partition_ctrl);
 440                 return ldb_module_done(ac->req,
 441                                        ldb_controls_except_specified(controls, ares, partition_ctrl),
 442                                        ares->response, LDB_SUCCESS);
 443         }
 444 }
 445
 446
 447 /*
 448  * update a @REPLCHANGED record in each partition if there have been
 449  * any writes of replicated data in the partition
 450  */
 451 static int replmd_notify_store(struct ldb_module *module, struct ldb_request *parent)
 452 {
 453         struct replmd_private *replmd_private =
 454                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 455
 456         while (replmd_private->ncs) {
 457                 int ret;
 458                 struct nc_entry *modified_partition = replmd_private->ncs;
 459
 460                 ret = dsdb_module_save_partition_usn(module, modified_partition->dn,
 461                                                      modified_partition->mod_usn,
 462                                                      modified_partition->mod_usn_urgent, parent);
 463                 if (ret != LDB_SUCCESS) {
 464                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 465                                  ldb_dn_get_linearized(modified_partition->dn)));
 466                         return ret;
 467                 }
 468                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 469                 talloc_free(modified_partition);
 470         }
 471
 472         return LDB_SUCCESS;
 473 }
 474
 475
 476 /*
 477   created a replmd_replicated_request context
 478  */
 479 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 480                                                          struct ldb_request *req)
 481 {
 482         struct ldb_context *ldb;
 483         struct replmd_replicated_request *ac;
 484
 485         ldb = ldb_module_get_ctx(module);
 486
 487         ac = talloc_zero(req, struct replmd_replicated_request);
 488         if (ac == NULL) {
 489                 ldb_oom(ldb);
 490                 return NULL;
 491         }
 492
 493         ac->module = module;
 494         ac->req = req;
 495
 496         ac->schema = dsdb_get_schema(ldb, ac);
 497         if (!ac->schema) {
 498                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 499                               "replmd_modify: no dsdb_schema loaded");
 500                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 501                 return NULL;
 502         }
 503
 504         return ac;
 505 }
 506
 507 /*
 508   add a time element to a record
 509 */
 510 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 511 {
 512         struct ldb_message_element *el;
 513         char *s;
 514         int ret;
 515
 516         if (ldb_msg_find_element(msg, attr) != NULL) {
 517                 return LDB_SUCCESS;
 518         }
 519
 520         s = ldb_timestring(msg, t);
 521         if (s == NULL) {
 522                 return LDB_ERR_OPERATIONS_ERROR;
 523         }
 524
 525         ret = ldb_msg_add_string(msg, attr, s);
 526         if (ret != LDB_SUCCESS) {
 527                 return ret;
 528         }
 529
 530         el = ldb_msg_find_element(msg, attr);
 531         /* always set as replace. This works because on add ops, the flag
 532            is ignored */
 533         el->flags = LDB_FLAG_MOD_REPLACE;
 534
 535         return LDB_SUCCESS;
 536 }
 537
 538 /*
 539   add a uint64_t element to a record
 540 */
 541 static int add_uint64_element(struct ldb_context *ldb, struct ldb_message *msg,
 542                               const char *attr, uint64_t v)
 543 {
 544         struct ldb_message_element *el;
 545         int ret;
 546
 547         if (ldb_msg_find_element(msg, attr) != NULL) {
 548                 return LDB_SUCCESS;
 549         }
 550
 551         ret = samdb_msg_add_uint64(ldb, msg, msg, attr, v);
 552         if (ret != LDB_SUCCESS) {
 553                 return ret;
 554         }
 555
 556         el = ldb_msg_find_element(msg, attr);
 557         /* always set as replace. This works because on add ops, the flag
 558            is ignored */
 559         el->flags = LDB_FLAG_MOD_REPLACE;
 560
 561         return LDB_SUCCESS;
 562 }
 563
 564 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 565                                                    const struct replPropertyMetaData1 *m2,
 566                                                    const uint32_t *rdn_attid)
 567 {
 568         if (m1->attid == m2->attid) {
 569                 return 0;
 570         }
 571
 572         /*
 573          * the rdn attribute should be at the end!
 574          * so we need to return a value greater than zero
 575          * which means m1 is greater than m2
 576          */
 577         if (m1->attid == *rdn_attid) {
 578                 return 1;
 579         }
 580
 581         /*
 582          * the rdn attribute should be at the end!
 583          * so we need to return a value less than zero
 584          * which means m2 is greater than m1
 585          */
 586         if (m2->attid == *rdn_attid) {
 587                 return -1;
 588         }
 589
 590         return m1->attid > m2->attid ? 1 : -1;
 591 }
 592
 593 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 594                                                 const struct dsdb_schema *schema,
 595                                                 struct ldb_dn *dn)
 596 {
 597         const char *rdn_name;
 598         const struct dsdb_attribute *rdn_sa;
 599
 600         rdn_name = ldb_dn_get_rdn_name(dn);
 601         if (!rdn_name) {
 602                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 603                 return LDB_ERR_OPERATIONS_ERROR;
 604         }
 605
 606         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 607         if (rdn_sa == NULL) {
 608                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 609                 return LDB_ERR_OPERATIONS_ERROR;
 610         }
 611
 612         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 613                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 614
 615         LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
 616
 617         return LDB_SUCCESS;
 618 }
 619
 620 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 621                                                  const struct ldb_message_element *e2,
 622                                                  const struct dsdb_schema *schema)
 623 {
 624         const struct dsdb_attribute *a1;
 625         const struct dsdb_attribute *a2;
 626
 627         /*
 628          * TODO: make this faster by caching the dsdb_attribute pointer
 629          *       on the ldb_messag_element
 630          */
 631
 632         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 633         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 634
 635         /*
 636          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 637          *       in the schema
 638          */
 639         if (!a1 || !a2) {
 640                 return strcasecmp(e1->name, e2->name);
 641         }
 642         if (a1->attributeID_id == a2->attributeID_id) {
 643                 return 0;
 644         }
 645         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 646 }
 647
 648 static void replmd_ldb_message_sort(struct ldb_message *msg,
 649                                     const struct dsdb_schema *schema)
 650 {
 651         LDB_TYPESAFE_QSORT(msg->elements, msg->num_elements, schema, replmd_ldb_message_element_attid_sort);
 652 }
 653
 654 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 655                                const struct GUID *invocation_id, uint64_t seq_num,
 656                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 657
 658
 659 /*
 660   fix up linked attributes in replmd_add.
 661   This involves setting up the right meta-data in extended DN
 662   components, and creating backlinks to the object
 663  */
 664 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 665                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 666                              struct GUID *guid, const struct dsdb_attribute *sa, struct ldb_request *parent)
 667 {
 668         unsigned int i;
 669         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 670         struct ldb_context *ldb = ldb_module_get_ctx(module);
 671
 672         /* We will take a reference to the schema in replmd_add_backlink */
 673         const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
 674         NTTIME now;
 675
 676         unix_to_nt_time(&now, t);
 677
 678         for (i=0; i<el->num_values; i++) {
 679                 struct ldb_val *v = &el->values[i];
 680                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 681                 struct GUID target_guid;
 682                 NTSTATUS status;
 683                 int ret;
 684
 685                 /* note that the DN already has the extended
 686                    components from the extended_dn_store module */
 687                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 688                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 689                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid, parent);
 690                         if (ret != LDB_SUCCESS) {
 691                                 talloc_free(tmp_ctx);
 692                                 return ret;
 693                         }
 694                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 695                         if (ret != LDB_SUCCESS) {
 696                                 talloc_free(tmp_ctx);
 697                                 return ret;
 698                         }
 699                 }
 700
 701                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 702                                           seq_num, seq_num, now, 0, false);
 703                 if (ret != LDB_SUCCESS) {
 704                         talloc_free(tmp_ctx);
 705                         return ret;
 706                 }
 707
 708                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 709                 if (ret != LDB_SUCCESS) {
 710                         talloc_free(tmp_ctx);
 711                         return ret;
 712                 }
 713         }
 714
 715         talloc_free(tmp_ctx);
 716         return LDB_SUCCESS;
 717 }
 718
 719
 720 /*
 721   intercept add requests
 722  */
 723 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 724 {
 725         struct ldb_context *ldb;
 726         struct ldb_control *control;
 727         struct replmd_replicated_request *ac;
 728         enum ndr_err_code ndr_err;
 729         struct ldb_request *down_req;
 730         struct ldb_message *msg;
 731         const DATA_BLOB *guid_blob;
 732         struct GUID guid;
 733         struct replPropertyMetaDataBlob nmd;
 734         struct ldb_val nmd_value;
 735         const struct GUID *our_invocation_id;
 736         time_t t = time(NULL);
 737         NTTIME now;
 738         char *time_str;
 739         int ret;
 740         unsigned int i;
 741         unsigned int functional_level;
 742         uint32_t ni=0;
 743         bool allow_add_guid = false;
 744         bool remove_current_guid = false;
 745         bool is_urgent = false;
 746         struct ldb_message_element *objectclass_el;
 747
 748         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 749         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 750         if (control) {
 751                 allow_add_guid = true;
 752         }
 753
 754         /* do not manipulate our control entries */
 755         if (ldb_dn_is_special(req->op.add.message->dn)) {
 756                 return ldb_next_request(module, req);
 757         }
 758
 759         ldb = ldb_module_get_ctx(module);
 760
 761         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 762
 763         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 764         if (guid_blob != NULL) {
 765                 if (!allow_add_guid) {
 766                         ldb_set_errstring(ldb,
 767                                           "replmd_add: it's not allowed to add an object with objectGUID!");
 768                         return LDB_ERR_UNWILLING_TO_PERFORM;
 769                 } else {
 770                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 771                         if (!NT_STATUS_IS_OK(status)) {
 772                                 ldb_set_errstring(ldb,
 773                                                   "replmd_add: Unable to parse the 'objectGUID' as a GUID!");
 774                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 775                         }
 776                         /* we remove this attribute as it can be a string and
 777                          * will not be treated correctly and then we will re-add
 778                          * it later on in the good format */
 779                         remove_current_guid = true;
 780                 }
 781         } else {
 782                 /* a new GUID */
 783                 guid = GUID_random();
 784         }
 785
 786         ac = replmd_ctx_init(module, req);
 787         if (ac == NULL) {
 788                 return ldb_module_oom(module);
 789         }
 790
 791         functional_level = dsdb_functional_level(ldb);
 792
 793         /* Get a sequence number from the backend */
 794         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 795         if (ret != LDB_SUCCESS) {
 796                 talloc_free(ac);
 797                 return ret;
 798         }
 799
 800         /* get our invocationId */
 801         our_invocation_id = samdb_ntds_invocation_id(ldb);
 802         if (!our_invocation_id) {
 803                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 804                               "replmd_add: unable to find invocationId\n");
 805                 talloc_free(ac);
 806                 return LDB_ERR_OPERATIONS_ERROR;
 807         }
 808
 809         /* we have to copy the message as the caller might have it as a const */
 810         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 811         if (msg == NULL) {
 812                 ldb_oom(ldb);
 813                 talloc_free(ac);
 814                 return LDB_ERR_OPERATIONS_ERROR;
 815         }
 816
 817         /* generated times */
 818         unix_to_nt_time(&now, t);
 819         time_str = ldb_timestring(msg, t);
 820         if (!time_str) {
 821                 ldb_oom(ldb);
 822                 talloc_free(ac);
 823                 return LDB_ERR_OPERATIONS_ERROR;
 824         }
 825         if (remove_current_guid) {
 826                 ldb_msg_remove_attr(msg,"objectGUID");
 827         }
 828
 829         /*
 830          * remove autogenerated attributes
 831          */
 832         ldb_msg_remove_attr(msg, "whenCreated");
 833         ldb_msg_remove_attr(msg, "whenChanged");
 834         ldb_msg_remove_attr(msg, "uSNCreated");
 835         ldb_msg_remove_attr(msg, "uSNChanged");
 836         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 837
 838         /*
 839          * readd replicated attributes
 840          */
 841         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 842         if (ret != LDB_SUCCESS) {
 843                 ldb_oom(ldb);
 844                 talloc_free(ac);
 845                 return ret;
 846         }
 847
 848         /* build the replication meta_data */
 849         ZERO_STRUCT(nmd);
 850         nmd.version             = 1;
 851         nmd.ctr.ctr1.count      = msg->num_elements;
 852         nmd.ctr.ctr1.array      = talloc_array(msg,
 853                                                struct replPropertyMetaData1,
 854                                                nmd.ctr.ctr1.count);
 855         if (!nmd.ctr.ctr1.array) {
 856                 ldb_oom(ldb);
 857                 talloc_free(ac);
 858                 return LDB_ERR_OPERATIONS_ERROR;
 859         }
 860
 861         for (i=0; i < msg->num_elements; i++) {
 862                 struct ldb_message_element *e = &msg->elements[i];
 863                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 864                 const struct dsdb_attribute *sa;
 865
 866                 if (e->name[0] == '@') continue;
 867
 868                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 869                 if (!sa) {
 870                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 871                                       "replmd_add: attribute '%s' not defined in schema\n",
 872                                       e->name);
 873                         talloc_free(ac);
 874                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 875                 }
 876
 877                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 878                         /* if the attribute is not replicated (0x00000001)
 879                          * or constructed (0x00000004) it has no metadata
 880                          */
 881                         continue;
 882                 }
 883
 884                 if (sa->linkID != 0 && functional_level > DS_DOMAIN_FUNCTION_2000) {
 885                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa, req);
 886                         if (ret != LDB_SUCCESS) {
 887                                 talloc_free(ac);
 888                                 return ret;
 889                         }
 890                         /* linked attributes are not stored in
 891                            replPropertyMetaData in FL above w2k */
 892                         continue;
 893                 }
 894
 895                 m->attid                        = sa->attributeID_id;
 896                 m->version                      = 1;
 897                 m->originating_change_time      = now;
 898                 m->originating_invocation_id    = *our_invocation_id;
 899                 m->originating_usn              = ac->seq_num;
 900                 m->local_usn                    = ac->seq_num;
 901                 ni++;
 902         }
 903
 904         /* fix meta data count */
 905         nmd.ctr.ctr1.count = ni;
 906
 907         /*
 908          * sort meta data array, and move the rdn attribute entry to the end
 909          */
 910         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 911         if (ret != LDB_SUCCESS) {
 912                 talloc_free(ac);
 913                 return ret;
 914         }
 915
 916         /* generated NDR encoded values */
 917         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 918                                        &nmd,
 919                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 920         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 921                 ldb_oom(ldb);
 922                 talloc_free(ac);
 923                 return LDB_ERR_OPERATIONS_ERROR;
 924         }
 925
 926         /*
 927          * add the autogenerated values
 928          */
 929         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 930         if (ret != LDB_SUCCESS) {
 931                 ldb_oom(ldb);
 932                 talloc_free(ac);
 933                 return ret;
 934         }
 935         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 936         if (ret != LDB_SUCCESS) {
 937                 ldb_oom(ldb);
 938                 talloc_free(ac);
 939                 return ret;
 940         }
 941         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 942         if (ret != LDB_SUCCESS) {
 943                 ldb_oom(ldb);
 944                 talloc_free(ac);
 945                 return ret;
 946         }
 947         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 948         if (ret != LDB_SUCCESS) {
 949                 ldb_oom(ldb);
 950                 talloc_free(ac);
 951                 return ret;
 952         }
 953         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 954         if (ret != LDB_SUCCESS) {
 955                 ldb_oom(ldb);
 956                 talloc_free(ac);
 957                 return ret;
 958         }
 959
 960         /*
 961          * sort the attributes by attid before storing the object
 962          */
 963         replmd_ldb_message_sort(msg, ac->schema);
 964
 965         objectclass_el = ldb_msg_find_element(msg, "objectClass");
 966         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
 967                                                         REPL_URGENT_ON_CREATE);
 968
 969         ac->is_urgent = is_urgent;
 970         ret = ldb_build_add_req(&down_req, ldb, ac,
 971                                 msg,
 972                                 req->controls,
 973                                 ac, replmd_op_callback,
 974                                 req);
 975
 976         LDB_REQ_SET_LOCATION(down_req);
 977         if (ret != LDB_SUCCESS) {
 978                 talloc_free(ac);
 979                 return ret;
 980         }
 981
 982         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
 983                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
 984                 if (ret != LDB_SUCCESS) {
 985                         talloc_free(ac);
 986                         return ret;
 987                 }
 988         }
 989
 990         /* mark the control done */
 991         if (control) {
 992                 control->critical = 0;
 993         }
 994
 995         /* go on with the call chain */
 996         return ldb_next_request(module, down_req);
 997 }
 998
 999
1000 /*
1001  * update the replPropertyMetaData for one element
1002  */
1003 static int replmd_update_rpmd_element(struct ldb_context *ldb,
1004                                       struct ldb_message *msg,
1005                                       struct ldb_message_element *el,
1006                                       struct ldb_message_element *old_el,
1007                                       struct replPropertyMetaDataBlob *omd,
1008                                       const struct dsdb_schema *schema,
1009                                       uint64_t *seq_num,
1010                                       const struct GUID *our_invocation_id,
1011                                       NTTIME now)
1012 {
1013         uint32_t i;
1014         const struct dsdb_attribute *a;
1015         struct replPropertyMetaData1 *md1;
1016
1017         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1018         if (a == NULL) {
1019                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1020                          el->name));
1021                 return LDB_ERR_OPERATIONS_ERROR;
1022         }
1023
1024         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1025                 return LDB_SUCCESS;
1026         }
1027
1028         /* if the attribute's value haven't changed then return LDB_SUCCESS     */
1029         if (old_el != NULL && ldb_msg_element_compare(el, old_el) == 0) {
1030                 return LDB_SUCCESS;
1031         }
1032
1033         for (i=0; i<omd->ctr.ctr1.count; i++) {
1034                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1035         }
1036
1037         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1038                 /* linked attributes are not stored in
1039                    replPropertyMetaData in FL above w2k, but we do
1040                    raise the seqnum for the object  */
1041                 if (*seq_num == 0 &&
1042                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1043                         return LDB_ERR_OPERATIONS_ERROR;
1044                 }
1045                 return LDB_SUCCESS;
1046         }
1047
1048         if (i == omd->ctr.ctr1.count) {
1049                 /* we need to add a new one */
1050                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1051                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1052                 if (omd->ctr.ctr1.array == NULL) {
1053                         ldb_oom(ldb);
1054                         return LDB_ERR_OPERATIONS_ERROR;
1055                 }
1056                 omd->ctr.ctr1.count++;
1057                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1058         }
1059
1060         /* Get a new sequence number from the backend. We only do this
1061          * if we have a change that requires a new
1062          * replPropertyMetaData element
1063          */
1064         if (*seq_num == 0) {
1065                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1066                 if (ret != LDB_SUCCESS) {
1067                         return LDB_ERR_OPERATIONS_ERROR;
1068                 }
1069         }
1070
1071         md1 = &omd->ctr.ctr1.array[i];
1072         md1->version++;
1073         md1->attid                     = a->attributeID_id;
1074         md1->originating_change_time   = now;
1075         md1->originating_invocation_id = *our_invocation_id;
1076         md1->originating_usn           = *seq_num;
1077         md1->local_usn                 = *seq_num;
1078
1079         return LDB_SUCCESS;
1080 }
1081
1082 static uint64_t find_max_local_usn(struct replPropertyMetaDataBlob omd)
1083 {
1084         uint32_t count = omd.ctr.ctr1.count;
1085         uint64_t max = 0;
1086         uint32_t i;
1087         for (i=0; i < count; i++) {
1088                 struct replPropertyMetaData1 m = omd.ctr.ctr1.array[i];
1089                 if (max < m.local_usn) {
1090                         max = m.local_usn;
1091                 }
1092         }
1093         return max;
1094 }
1095
1096 /*
1097  * update the replPropertyMetaData object each time we modify an
1098  * object. This is needed for DRS replication, as the merge on the
1099  * client is based on this object
1100  */
1101 static int replmd_update_rpmd(struct ldb_module *module,
1102                               const struct dsdb_schema *schema,
1103                               struct ldb_request *req,
1104                               struct ldb_message *msg, uint64_t *seq_num,
1105                               time_t t,
1106                               bool *is_urgent)
1107 {
1108         const struct ldb_val *omd_value;
1109         enum ndr_err_code ndr_err;
1110         struct replPropertyMetaDataBlob omd;
1111         unsigned int i;
1112         NTTIME now;
1113         const struct GUID *our_invocation_id;
1114         int ret;
1115         const char *attrs[] = { "replPropertyMetaData", "*", NULL };
1116         const char *attrs2[] = { "uSNChanged", "objectClass", NULL };
1117         struct ldb_result *res;
1118         struct ldb_context *ldb;
1119         struct ldb_message_element *objectclass_el;
1120         enum urgent_situation situation;
1121         bool rodc, rmd_is_provided;
1122
1123         ldb = ldb_module_get_ctx(module);
1124
1125         our_invocation_id = samdb_ntds_invocation_id(ldb);
1126         if (!our_invocation_id) {
1127                 /* this happens during an initial vampire while
1128                    updating the schema */
1129                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1130                 return LDB_SUCCESS;
1131         }
1132
1133         unix_to_nt_time(&now, t);
1134
1135         if (ldb_request_get_control(req, DSDB_CONTROL_CHANGEREPLMETADATA_OID)) {
1136                 rmd_is_provided = true;
1137         } else {
1138                 rmd_is_provided = false;
1139         }
1140
1141         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1142          * otherwise we consider we are updating */
1143         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1144                 situation = REPL_URGENT_ON_DELETE;
1145         } else {
1146                 situation = REPL_URGENT_ON_UPDATE;
1147         }
1148
1149         if (rmd_is_provided) {
1150                 /* In this case the change_replmetadata control was supplied */
1151                 /* We check that it's the only attribute that is provided
1152                  * (it's a rare case so it's better to keep the code simplier)
1153                  * We also check that the highest local_usn is bigger than
1154                  * uSNChanged. */
1155                 uint64_t db_seq;
1156                 if( msg->num_elements != 1 ||
1157                         strncmp(msg->elements[0].name,
1158                                 "replPropertyMetaData", 20) ) {
1159                         DEBUG(0,(__location__ ": changereplmetada control called without "\
1160                                 "a specified replPropertyMetaData attribute or with others\n"));
1161                         return LDB_ERR_OPERATIONS_ERROR;
1162                 }
1163                 if (situation == REPL_URGENT_ON_DELETE) {
1164                         DEBUG(0,(__location__ ": changereplmetada control can't be called when deleting an object\n"));
1165                         return LDB_ERR_OPERATIONS_ERROR;
1166                 }
1167                 omd_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
1168                 if (!omd_value) {
1169                         DEBUG(0,(__location__ ": replPropertyMetaData was not specified for Object %s\n",
1170                                  ldb_dn_get_linearized(msg->dn)));
1171                         return LDB_ERR_OPERATIONS_ERROR;
1172                 }
1173                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1174                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1175                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1176                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1177                                  ldb_dn_get_linearized(msg->dn)));
1178                         return LDB_ERR_OPERATIONS_ERROR;
1179                 }
1180                 *seq_num = find_max_local_usn(omd);
1181
1182                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs2,
1183                                             DSDB_FLAG_NEXT_MODULE |
1184                                             DSDB_SEARCH_SHOW_RECYCLED |
1185                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1186                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1187                                             DSDB_SEARCH_REVEAL_INTERNALS, req);
1188
1189                 if (ret != LDB_SUCCESS || res->count != 1) {
1190                         DEBUG(0,(__location__ ": Object %s failed to find uSNChanged\n",
1191                                  ldb_dn_get_linearized(msg->dn)));
1192                         return LDB_ERR_OPERATIONS_ERROR;
1193                 }
1194
1195                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1196                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1197                                                                 situation)) {
1198                         *is_urgent = true;
1199                 }
1200
1201                 db_seq = ldb_msg_find_attr_as_uint64(res->msgs[0], "uSNChanged", 0);
1202                 if (*seq_num <= db_seq) {
1203                         DEBUG(0,(__location__ ": changereplmetada control provided but max(local_usn)"\
1204                                               " is less or equal to uSNChanged (max = %lld uSNChanged = %lld)\n",
1205                                  (long long)*seq_num, (long long)db_seq));
1206                         return LDB_ERR_OPERATIONS_ERROR;
1207                 }
1208
1209         } else {
1210                 /* search for the existing replPropertyMetaDataBlob. We need
1211                  * to use REVEAL and ask for DNs in storage format to support
1212                  * the check for values being the same in
1213                  * replmd_update_rpmd_element()
1214                  */
1215                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
1216                                             DSDB_FLAG_NEXT_MODULE |
1217                                             DSDB_SEARCH_SHOW_RECYCLED |
1218                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1219                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1220                                             DSDB_SEARCH_REVEAL_INTERNALS, req);
1221                 if (ret != LDB_SUCCESS || res->count != 1) {
1222                         DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1223                                  ldb_dn_get_linearized(msg->dn)));
1224                         return LDB_ERR_OPERATIONS_ERROR;
1225                 }
1226
1227                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1228                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1229                                                                 situation)) {
1230                         *is_urgent = true;
1231                 }
1232
1233                 omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1234                 if (!omd_value) {
1235                         DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1236                                  ldb_dn_get_linearized(msg->dn)));
1237                         return LDB_ERR_OPERATIONS_ERROR;
1238                 }
1239
1240                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1241                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1242                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1243                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1244                                  ldb_dn_get_linearized(msg->dn)));
1245                         return LDB_ERR_OPERATIONS_ERROR;
1246                 }
1247
1248                 if (omd.version != 1) {
1249                         DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1250                                  omd.version, ldb_dn_get_linearized(msg->dn)));
1251                         return LDB_ERR_OPERATIONS_ERROR;
1252                 }
1253
1254                 for (i=0; i<msg->num_elements; i++) {
1255                         struct ldb_message_element *old_el;
1256                         old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1257                         ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1258                                                          our_invocation_id, now);
1259                         if (ret != LDB_SUCCESS) {
1260                                 return ret;
1261                         }
1262
1263                         if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1264                                 *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1265                         }
1266
1267                 }
1268         }
1269         /*
1270          * replmd_update_rpmd_element has done an update if the
1271          * seq_num is set
1272          */
1273         if (*seq_num != 0) {
1274                 struct ldb_val *md_value;
1275                 struct ldb_message_element *el;
1276
1277                 /*if we are RODC and this is a DRSR update then its ok*/
1278                 if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
1279                         ret = samdb_rodc(ldb, &rodc);
1280                         if (ret != LDB_SUCCESS) {
1281                                 DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
1282                         } else if (rodc) {
1283                                 ldb_asprintf_errstring(ldb, "RODC modify is forbidden\n");
1284                                 return LDB_ERR_REFERRAL;
1285                         }
1286                 }
1287
1288                 md_value = talloc(msg, struct ldb_val);
1289                 if (md_value == NULL) {
1290                         ldb_oom(ldb);
1291                         return LDB_ERR_OPERATIONS_ERROR;
1292                 }
1293
1294                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1295                 if (ret != LDB_SUCCESS) {
1296                         return ret;
1297                 }
1298
1299                 ndr_err = ndr_push_struct_blob(md_value, msg, &omd,
1300                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1301                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1302                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1303                                  ldb_dn_get_linearized(msg->dn)));
1304                         return LDB_ERR_OPERATIONS_ERROR;
1305                 }
1306
1307                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1308                 if (ret != LDB_SUCCESS) {
1309                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1310                                  ldb_dn_get_linearized(msg->dn)));
1311                         return ret;
1312                 }
1313
1314                 el->num_values = 1;
1315                 el->values = md_value;
1316         }
1317
1318         return LDB_SUCCESS;
1319 }
1320
1321 struct parsed_dn {
1322         struct dsdb_dn *dsdb_dn;
1323         struct GUID *guid;
1324         struct ldb_val *v;
1325 };
1326
1327 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1328 {
1329         return GUID_compare(pdn1->guid, pdn2->guid);
1330 }
1331
1332 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn,
1333                                         unsigned int count, struct GUID *guid,
1334                                         struct ldb_dn *dn)
1335 {
1336         struct parsed_dn *ret;
1337         unsigned int i;
1338         if (dn && GUID_all_zero(guid)) {
1339                 /* when updating a link using DRS, we sometimes get a
1340                    NULL GUID. We then need to try and match by DN */
1341                 for (i=0; i<count; i++) {
1342                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1343                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1344                                 return &pdn[i];
1345                         }
1346                 }
1347                 return NULL;
1348         }
1349         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1350         return ret;
1351 }
1352
1353 /*
1354   get a series of message element values as an array of DNs and GUIDs
1355   the result is sorted by GUID
1356  */
1357 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1358                           struct ldb_message_element *el, struct parsed_dn **pdn,
1359                           const char *ldap_oid, struct ldb_request *parent)
1360 {
1361         unsigned int i;
1362         struct ldb_context *ldb = ldb_module_get_ctx(module);
1363
1364         if (el == NULL) {
1365                 *pdn = NULL;
1366                 return LDB_SUCCESS;
1367         }
1368
1369         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1370         if (!*pdn) {
1371                 ldb_module_oom(module);
1372                 return LDB_ERR_OPERATIONS_ERROR;
1373         }
1374
1375         for (i=0; i<el->num_values; i++) {
1376                 struct ldb_val *v = &el->values[i];
1377                 NTSTATUS status;
1378                 struct ldb_dn *dn;
1379                 struct parsed_dn *p;
1380
1381                 p = &(*pdn)[i];
1382
1383                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1384                 if (p->dsdb_dn == NULL) {
1385                         return LDB_ERR_INVALID_DN_SYNTAX;
1386                 }
1387
1388                 dn = p->dsdb_dn->dn;
1389
1390                 p->guid = talloc(*pdn, struct GUID);
1391                 if (p->guid == NULL) {
1392                         ldb_module_oom(module);
1393                         return LDB_ERR_OPERATIONS_ERROR;
1394                 }
1395
1396                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1397                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1398                         /* we got a DN without a GUID - go find the GUID */
1399                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid, parent);
1400                         if (ret != LDB_SUCCESS) {
1401                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1402                                                        ldb_dn_get_linearized(dn));
1403                                 return ret;
1404                         }
1405                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1406                         if (ret != LDB_SUCCESS) {
1407                                 return ret;
1408                         }
1409                 } else if (!NT_STATUS_IS_OK(status)) {
1410                         return LDB_ERR_OPERATIONS_ERROR;
1411                 }
1412
1413                 /* keep a pointer to the original ldb_val */
1414                 p->v = v;
1415         }
1416
1417         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1418
1419         return LDB_SUCCESS;
1420 }
1421
1422 /*
1423   build a new extended DN, including all meta data fields
1424
1425   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1426   RMD_ADDTIME         = originating_add_time
1427   RMD_INVOCID         = originating_invocation_id
1428   RMD_CHANGETIME      = originating_change_time
1429   RMD_ORIGINATING_USN = originating_usn
1430   RMD_LOCAL_USN       = local_usn
1431   RMD_VERSION         = version
1432  */
1433 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1434                                const struct GUID *invocation_id, uint64_t seq_num,
1435                                uint64_t local_usn, NTTIME nttime, 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         NTSTATUS status;
1444         int ret;
1445         const char *dnstring;
1446         char *vstring;
1447         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1448
1449         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1450         if (!tstring) {
1451                 return LDB_ERR_OPERATIONS_ERROR;
1452         }
1453         tval = data_blob_string_const(tstring);
1454
1455         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1456         if (!usn_string) {
1457                 return LDB_ERR_OPERATIONS_ERROR;
1458         }
1459         usnv = data_blob_string_const(usn_string);
1460
1461         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1462         if (!usn_string) {
1463                 return LDB_ERR_OPERATIONS_ERROR;
1464         }
1465         local_usnv = data_blob_string_const(usn_string);
1466
1467         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1468         if (!vstring) {
1469                 return LDB_ERR_OPERATIONS_ERROR;
1470         }
1471         vers = data_blob_string_const(vstring);
1472
1473         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1474         if (!NT_STATUS_IS_OK(status)) {
1475                 return LDB_ERR_OPERATIONS_ERROR;
1476         }
1477
1478         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1479         if (!flags_string) {
1480                 return LDB_ERR_OPERATIONS_ERROR;
1481         }
1482         flagsv = data_blob_string_const(flags_string);
1483
1484         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1485         if (ret != LDB_SUCCESS) return ret;
1486         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1487         if (ret != LDB_SUCCESS) return ret;
1488         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1489         if (ret != LDB_SUCCESS) return ret;
1490         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1491         if (ret != LDB_SUCCESS) return ret;
1492         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1493         if (ret != LDB_SUCCESS) return ret;
1494         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1495         if (ret != LDB_SUCCESS) return ret;
1496         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1497         if (ret != LDB_SUCCESS) return ret;
1498
1499         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1500         if (dnstring == NULL) {
1501                 return LDB_ERR_OPERATIONS_ERROR;
1502         }
1503         *v = data_blob_string_const(dnstring);
1504
1505         return LDB_SUCCESS;
1506 }
1507
1508 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1509                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1510                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1511                                 uint32_t version, bool deleted);
1512
1513 /*
1514   check if any links need upgrading from w2k format
1515
1516   The parent_ctx is the ldb_message_element which contains the values array that dns[i].v points at, and which should be used for allocating any new value.
1517  */
1518 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1519 {
1520         uint32_t i;
1521         for (i=0; i<count; i++) {
1522                 NTSTATUS status;
1523                 uint32_t version;
1524                 int ret;
1525
1526                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1527                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1528                         continue;
1529                 }
1530
1531                 /* it's an old one that needs upgrading */
1532                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1533                                            1, 1, 0, 0, false);
1534                 if (ret != LDB_SUCCESS) {
1535                         return ret;
1536                 }
1537         }
1538         return LDB_SUCCESS;
1539 }
1540
1541 /*
1542   update an extended DN, including all meta data fields
1543
1544   see replmd_build_la_val for value names
1545  */
1546 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1547                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1548                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1549                                 uint32_t version, bool deleted)
1550 {
1551         struct ldb_dn *dn = dsdb_dn->dn;
1552         const char *tstring, *usn_string, *flags_string;
1553         struct ldb_val tval;
1554         struct ldb_val iid;
1555         struct ldb_val usnv, local_usnv;
1556         struct ldb_val vers, flagsv;
1557         const struct ldb_val *old_addtime;
1558         uint32_t old_version;
1559         NTSTATUS status;
1560         int ret;
1561         const char *dnstring;
1562         char *vstring;
1563         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1564
1565         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1566         if (!tstring) {
1567                 return LDB_ERR_OPERATIONS_ERROR;
1568         }
1569         tval = data_blob_string_const(tstring);
1570
1571         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1572         if (!usn_string) {
1573                 return LDB_ERR_OPERATIONS_ERROR;
1574         }
1575         usnv = data_blob_string_const(usn_string);
1576
1577         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1578         if (!usn_string) {
1579                 return LDB_ERR_OPERATIONS_ERROR;
1580         }
1581         local_usnv = data_blob_string_const(usn_string);
1582
1583         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1584         if (!NT_STATUS_IS_OK(status)) {
1585                 return LDB_ERR_OPERATIONS_ERROR;
1586         }
1587
1588         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1589         if (!flags_string) {
1590                 return LDB_ERR_OPERATIONS_ERROR;
1591         }
1592         flagsv = data_blob_string_const(flags_string);
1593
1594         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1595         if (ret != LDB_SUCCESS) return ret;
1596
1597         /* get the ADDTIME from the original */
1598         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1599         if (old_addtime == NULL) {
1600                 old_addtime = &tval;
1601         }
1602         if (dsdb_dn != old_dsdb_dn) {
1603                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1604                 if (ret != LDB_SUCCESS) return ret;
1605         }
1606
1607         /* use our invocation id */
1608         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1609         if (ret != LDB_SUCCESS) return ret;
1610
1611         /* changetime is the current time */
1612         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1613         if (ret != LDB_SUCCESS) return ret;
1614
1615         /* update the USN */
1616         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1617         if (ret != LDB_SUCCESS) return ret;
1618
1619         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1620         if (ret != LDB_SUCCESS) return ret;
1621
1622         /* increase the version by 1 */
1623         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1624         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1625                 version = old_version+1;
1626         }
1627         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1628         vers = data_blob_string_const(vstring);
1629         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1630         if (ret != LDB_SUCCESS) return ret;
1631
1632         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1633         if (dnstring == NULL) {
1634                 return LDB_ERR_OPERATIONS_ERROR;
1635         }
1636         *v = data_blob_string_const(dnstring);
1637
1638         return LDB_SUCCESS;
1639 }
1640
1641 /*
1642   handle adding a linked attribute
1643  */
1644 static int replmd_modify_la_add(struct ldb_module *module,
1645                                 const struct dsdb_schema *schema,
1646                                 struct ldb_message *msg,
1647                                 struct ldb_message_element *el,
1648                                 struct ldb_message_element *old_el,
1649                                 const struct dsdb_attribute *schema_attr,
1650                                 uint64_t seq_num,
1651                                 time_t t,
1652                                 struct GUID *msg_guid,
1653                                 struct ldb_request *parent)
1654 {
1655         unsigned int i;
1656         struct parsed_dn *dns, *old_dns;
1657         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1658         int ret;
1659         struct ldb_val *new_values = NULL;
1660         unsigned int num_new_values = 0;
1661         unsigned old_num_values = old_el?old_el->num_values:0;
1662         const struct GUID *invocation_id;
1663         struct ldb_context *ldb = ldb_module_get_ctx(module);
1664         NTTIME now;
1665
1666         unix_to_nt_time(&now, t);
1667
1668         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
1669         if (ret != LDB_SUCCESS) {
1670                 talloc_free(tmp_ctx);
1671                 return ret;
1672         }
1673
1674         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
1675         if (ret != LDB_SUCCESS) {
1676                 talloc_free(tmp_ctx);
1677                 return ret;
1678         }
1679
1680         invocation_id = samdb_ntds_invocation_id(ldb);
1681         if (!invocation_id) {
1682                 talloc_free(tmp_ctx);
1683                 return LDB_ERR_OPERATIONS_ERROR;
1684         }
1685
1686         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1687         if (ret != LDB_SUCCESS) {
1688                 talloc_free(tmp_ctx);
1689                 return ret;
1690         }
1691
1692         /* for each new value, see if it exists already with the same GUID */
1693         for (i=0; i<el->num_values; i++) {
1694                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1695                 if (p == NULL) {
1696                         /* this is a new linked attribute value */
1697                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1698                         if (new_values == NULL) {
1699                                 ldb_module_oom(module);
1700                                 talloc_free(tmp_ctx);
1701                                 return LDB_ERR_OPERATIONS_ERROR;
1702                         }
1703                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1704                                                   invocation_id, seq_num, seq_num, now, 0, false);
1705                         if (ret != LDB_SUCCESS) {
1706                                 talloc_free(tmp_ctx);
1707                                 return ret;
1708                         }
1709                         num_new_values++;
1710                 } else {
1711                         /* this is only allowed if the GUID was
1712                            previously deleted. */
1713                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1714
1715                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1716                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1717                                                        el->name, GUID_string(tmp_ctx, p->guid));
1718                                 talloc_free(tmp_ctx);
1719                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1720                         }
1721                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1722                                                    invocation_id, seq_num, seq_num, now, 0, false);
1723                         if (ret != LDB_SUCCESS) {
1724                                 talloc_free(tmp_ctx);
1725                                 return ret;
1726                         }
1727                 }
1728
1729                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1730                 if (ret != LDB_SUCCESS) {
1731                         talloc_free(tmp_ctx);
1732                         return ret;
1733                 }
1734         }
1735
1736         /* add the new ones on to the end of the old values, constructing a new el->values */
1737         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1738                                     struct ldb_val,
1739                                     old_num_values+num_new_values);
1740         if (el->values == NULL) {
1741                 ldb_module_oom(module);
1742                 return LDB_ERR_OPERATIONS_ERROR;
1743         }
1744
1745         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1746         el->num_values = old_num_values + num_new_values;
1747
1748         talloc_steal(msg->elements, el->values);
1749         talloc_steal(el->values, new_values);
1750
1751         talloc_free(tmp_ctx);
1752
1753         /* we now tell the backend to replace all existing values
1754            with the one we have constructed */
1755         el->flags = LDB_FLAG_MOD_REPLACE;
1756
1757         return LDB_SUCCESS;
1758 }
1759
1760
1761 /*
1762   handle deleting all active linked attributes
1763  */
1764 static int replmd_modify_la_delete(struct ldb_module *module,
1765                                    const struct dsdb_schema *schema,
1766                                    struct ldb_message *msg,
1767                                    struct ldb_message_element *el,
1768                                    struct ldb_message_element *old_el,
1769                                    const struct dsdb_attribute *schema_attr,
1770                                    uint64_t seq_num,
1771                                    time_t t,
1772                                    struct GUID *msg_guid,
1773                                    struct ldb_request *parent)
1774 {
1775         unsigned int i;
1776         struct parsed_dn *dns, *old_dns;
1777         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1778         int ret;
1779         const struct GUID *invocation_id;
1780         struct ldb_context *ldb = ldb_module_get_ctx(module);
1781         NTTIME now;
1782
1783         unix_to_nt_time(&now, t);
1784
1785         /* check if there is nothing to delete */
1786         if ((!old_el || old_el->num_values == 0) &&
1787             el->num_values == 0) {
1788                 return LDB_SUCCESS;
1789         }
1790
1791         if (!old_el || old_el->num_values == 0) {
1792                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1793         }
1794
1795         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
1796         if (ret != LDB_SUCCESS) {
1797                 talloc_free(tmp_ctx);
1798                 return ret;
1799         }
1800
1801         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
1802         if (ret != LDB_SUCCESS) {
1803                 talloc_free(tmp_ctx);
1804                 return ret;
1805         }
1806
1807         invocation_id = samdb_ntds_invocation_id(ldb);
1808         if (!invocation_id) {
1809                 return LDB_ERR_OPERATIONS_ERROR;
1810         }
1811
1812         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
1813         if (ret != LDB_SUCCESS) {
1814                 talloc_free(tmp_ctx);
1815                 return ret;
1816         }
1817
1818         el->values = NULL;
1819
1820         /* see if we are being asked to delete any links that
1821            don't exist or are already deleted */
1822         for (i=0; i<el->num_values; i++) {
1823                 struct parsed_dn *p = &dns[i];
1824                 struct parsed_dn *p2;
1825                 uint32_t rmd_flags;
1826
1827                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1828                 if (!p2) {
1829                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1830                                                el->name, GUID_string(tmp_ctx, p->guid));
1831                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1832                 }
1833                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1834                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1835                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1836                                                el->name, GUID_string(tmp_ctx, p->guid));
1837                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1838                 }
1839         }
1840
1841         /* for each new value, see if it exists already with the same GUID
1842            if it is not already deleted and matches the delete list then delete it
1843         */
1844         for (i=0; i<old_el->num_values; i++) {
1845                 struct parsed_dn *p = &old_dns[i];
1846                 uint32_t rmd_flags;
1847
1848                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1849                         continue;
1850                 }
1851
1852                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1853                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1854
1855                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1856                                            invocation_id, seq_num, seq_num, now, 0, true);
1857                 if (ret != LDB_SUCCESS) {
1858                         talloc_free(tmp_ctx);
1859                         return ret;
1860                 }
1861
1862                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1863                 if (ret != LDB_SUCCESS) {
1864                         talloc_free(tmp_ctx);
1865                         return ret;
1866                 }
1867         }
1868
1869         el->values = talloc_steal(msg->elements, old_el->values);
1870         el->num_values = old_el->num_values;
1871
1872         talloc_free(tmp_ctx);
1873
1874         /* we now tell the backend to replace all existing values
1875            with the one we have constructed */
1876         el->flags = LDB_FLAG_MOD_REPLACE;
1877
1878         return LDB_SUCCESS;
1879 }
1880
1881 /*
1882   handle replacing a linked attribute
1883  */
1884 static int replmd_modify_la_replace(struct ldb_module *module,
1885                                     const struct dsdb_schema *schema,
1886                                     struct ldb_message *msg,
1887                                     struct ldb_message_element *el,
1888                                     struct ldb_message_element *old_el,
1889                                     const struct dsdb_attribute *schema_attr,
1890                                     uint64_t seq_num,
1891                                     time_t t,
1892                                     struct GUID *msg_guid,
1893                                     struct ldb_request *parent)
1894 {
1895         unsigned int i;
1896         struct parsed_dn *dns, *old_dns;
1897         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1898         int ret;
1899         const struct GUID *invocation_id;
1900         struct ldb_context *ldb = ldb_module_get_ctx(module);
1901         struct ldb_val *new_values = NULL;
1902         unsigned int num_new_values = 0;
1903         unsigned int old_num_values = old_el?old_el->num_values:0;
1904         NTTIME now;
1905
1906         unix_to_nt_time(&now, t);
1907
1908         /* check if there is nothing to replace */
1909         if ((!old_el || old_el->num_values == 0) &&
1910             el->num_values == 0) {
1911                 return LDB_SUCCESS;
1912         }
1913
1914         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
1915         if (ret != LDB_SUCCESS) {
1916                 talloc_free(tmp_ctx);
1917                 return ret;
1918         }
1919
1920         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
1921         if (ret != LDB_SUCCESS) {
1922                 talloc_free(tmp_ctx);
1923                 return ret;
1924         }
1925
1926         invocation_id = samdb_ntds_invocation_id(ldb);
1927         if (!invocation_id) {
1928                 return LDB_ERR_OPERATIONS_ERROR;
1929         }
1930
1931         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1932         if (ret != LDB_SUCCESS) {
1933                 talloc_free(tmp_ctx);
1934                 return ret;
1935         }
1936
1937         /* mark all the old ones as deleted */
1938         for (i=0; i<old_num_values; i++) {
1939                 struct parsed_dn *old_p = &old_dns[i];
1940                 struct parsed_dn *p;
1941                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1942
1943                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1944
1945                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1946                 if (ret != LDB_SUCCESS) {
1947                         talloc_free(tmp_ctx);
1948                         return ret;
1949                 }
1950
1951                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1952                 if (p) {
1953                         /* we don't delete it if we are re-adding it */
1954                         continue;
1955                 }
1956
1957                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1958                                            invocation_id, seq_num, seq_num, now, 0, true);
1959                 if (ret != LDB_SUCCESS) {
1960                         talloc_free(tmp_ctx);
1961                         return ret;
1962                 }
1963         }
1964
1965         /* for each new value, either update its meta-data, or add it
1966          * to old_el
1967         */
1968         for (i=0; i<el->num_values; i++) {
1969                 struct parsed_dn *p = &dns[i], *old_p;
1970
1971                 if (old_dns &&
1972                     (old_p = parsed_dn_find(old_dns,
1973                                             old_num_values, p->guid, NULL)) != NULL) {
1974                         /* update in place */
1975                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1976                                                    old_p->dsdb_dn, invocation_id,
1977                                                    seq_num, seq_num, now, 0, false);
1978                         if (ret != LDB_SUCCESS) {
1979                                 talloc_free(tmp_ctx);
1980                                 return ret;
1981                         }
1982                 } else {
1983                         /* add a new one */
1984                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1985                                                     num_new_values+1);
1986                         if (new_values == NULL) {
1987                                 ldb_module_oom(module);
1988                                 talloc_free(tmp_ctx);
1989                                 return LDB_ERR_OPERATIONS_ERROR;
1990                         }
1991                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1992                                                   invocation_id, seq_num, seq_num, now, 0, false);
1993                         if (ret != LDB_SUCCESS) {
1994                                 talloc_free(tmp_ctx);
1995                                 return ret;
1996                         }
1997                         num_new_values++;
1998                 }
1999
2000                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
2001                 if (ret != LDB_SUCCESS) {
2002                         talloc_free(tmp_ctx);
2003                         return ret;
2004                 }
2005         }
2006
2007         /* add the new values to the end of old_el */
2008         if (num_new_values != 0) {
2009                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
2010                                             struct ldb_val, old_num_values+num_new_values);
2011                 if (el->values == NULL) {
2012                         ldb_module_oom(module);
2013                         return LDB_ERR_OPERATIONS_ERROR;
2014                 }
2015                 memcpy(&el->values[old_num_values], &new_values[0],
2016                        sizeof(struct ldb_val)*num_new_values);
2017                 el->num_values = old_num_values + num_new_values;
2018                 talloc_steal(msg->elements, new_values);
2019         } else {
2020                 el->values = old_el->values;
2021                 el->num_values = old_el->num_values;
2022                 talloc_steal(msg->elements, el->values);
2023         }
2024
2025         talloc_free(tmp_ctx);
2026
2027         /* we now tell the backend to replace all existing values
2028            with the one we have constructed */
2029         el->flags = LDB_FLAG_MOD_REPLACE;
2030
2031         return LDB_SUCCESS;
2032 }
2033
2034
2035 /*
2036   handle linked attributes in modify requests
2037  */
2038 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
2039                                                struct ldb_message *msg,
2040                                                uint64_t seq_num, time_t t,
2041                                                struct ldb_request *parent)
2042 {
2043         struct ldb_result *res;
2044         unsigned int i;
2045         int ret;
2046         struct ldb_context *ldb = ldb_module_get_ctx(module);
2047         struct ldb_message *old_msg;
2048
2049         const struct dsdb_schema *schema;
2050         struct GUID old_guid;
2051
2052         if (seq_num == 0) {
2053                 /* there the replmd_update_rpmd code has already
2054                  * checked and saw that there are no linked
2055                  * attributes */
2056                 return LDB_SUCCESS;
2057         }
2058
2059         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
2060                 /* don't do anything special for linked attributes */
2061                 return LDB_SUCCESS;
2062         }
2063
2064         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
2065                                     DSDB_FLAG_NEXT_MODULE |
2066                                     DSDB_SEARCH_SHOW_RECYCLED |
2067                                     DSDB_SEARCH_REVEAL_INTERNALS |
2068                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT,
2069                                     parent);
2070         if (ret != LDB_SUCCESS) {
2071                 return ret;
2072         }
2073         schema = dsdb_get_schema(ldb, res);
2074         if (!schema) {
2075                 return LDB_ERR_OPERATIONS_ERROR;
2076         }
2077
2078         old_msg = res->msgs[0];
2079
2080         old_guid = samdb_result_guid(old_msg, "objectGUID");
2081
2082         for (i=0; i<msg->num_elements; i++) {
2083                 struct ldb_message_element *el = &msg->elements[i];
2084                 struct ldb_message_element *old_el, *new_el;
2085                 const struct dsdb_attribute *schema_attr
2086                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2087                 if (!schema_attr) {
2088                         ldb_asprintf_errstring(ldb,
2089                                                "%s: attribute %s is not a valid attribute in schema",
2090                                                __FUNCTION__, el->name);
2091                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
2092                 }
2093                 if (schema_attr->linkID == 0) {
2094                         continue;
2095                 }
2096                 if ((schema_attr->linkID & 1) == 1) {
2097                         /* Odd is for the target.  Illegal to modify */
2098                         ldb_asprintf_errstring(ldb,
2099                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
2100                         return LDB_ERR_UNWILLING_TO_PERFORM;
2101                 }
2102                 old_el = ldb_msg_find_element(old_msg, el->name);
2103                 switch (el->flags & LDB_FLAG_MOD_MASK) {
2104                 case LDB_FLAG_MOD_REPLACE:
2105                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2106                         break;
2107                 case LDB_FLAG_MOD_DELETE:
2108                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2109                         break;
2110                 case LDB_FLAG_MOD_ADD:
2111                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
2112                         break;
2113                 default:
2114                         ldb_asprintf_errstring(ldb,
2115                                                "invalid flags 0x%x for %s linked attribute",
2116                                                el->flags, el->name);
2117                         return LDB_ERR_UNWILLING_TO_PERFORM;
2118                 }
2119                 if (ret != LDB_SUCCESS) {
2120                         return ret;
2121                 }
2122                 if (old_el) {
2123                         ldb_msg_remove_attr(old_msg, el->name);
2124                 }
2125                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2126                 new_el->num_values = el->num_values;
2127                 new_el->values = talloc_steal(msg->elements, el->values);
2128
2129                 /* TODO: this relises a bit too heavily on the exact
2130                    behaviour of ldb_msg_find_element and
2131                    ldb_msg_remove_element */
2132                 old_el = ldb_msg_find_element(msg, el->name);
2133                 if (old_el != el) {
2134                         ldb_msg_remove_element(msg, old_el);
2135                         i--;
2136                 }
2137         }
2138
2139         talloc_free(res);
2140         return ret;
2141 }
2142
2143
2144
2145 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2146 {
2147         struct ldb_context *ldb;
2148         struct replmd_replicated_request *ac;
2149         struct ldb_request *down_req;
2150         struct ldb_message *msg;
2151         time_t t = time(NULL);
2152         int ret;
2153         bool is_urgent = false;
2154         struct loadparm_context *lp_ctx;
2155         char *referral;
2156         unsigned int functional_level;
2157         const DATA_BLOB *guid_blob;
2158
2159         /* do not manipulate our control entries */
2160         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2161                 return ldb_next_request(module, req);
2162         }
2163
2164         ldb = ldb_module_get_ctx(module);
2165
2166         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2167
2168         guid_blob = ldb_msg_find_ldb_val(req->op.mod.message, "objectGUID");
2169         if ( guid_blob != NULL ) {
2170                 ldb_set_errstring(ldb,
2171                                   "replmd_modify: it's not allowed to change the objectGUID!");
2172                 return LDB_ERR_CONSTRAINT_VIOLATION;
2173         }
2174
2175         ac = replmd_ctx_init(module, req);
2176         if (ac == NULL) {
2177                 return ldb_module_oom(module);
2178         }
2179
2180         functional_level = dsdb_functional_level(ldb);
2181
2182         lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2183                                  struct loadparm_context);
2184
2185         /* we have to copy the message as the caller might have it as a const */
2186         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2187         if (msg == NULL) {
2188                 ldb_oom(ldb);
2189                 talloc_free(ac);
2190                 return LDB_ERR_OPERATIONS_ERROR;
2191         }
2192
2193         ldb_msg_remove_attr(msg, "whenChanged");
2194         ldb_msg_remove_attr(msg, "uSNChanged");
2195
2196         ret = replmd_update_rpmd(module, ac->schema, req, msg, &ac->seq_num, t, &is_urgent);
2197         if (ret == LDB_ERR_REFERRAL) {
2198                 referral = talloc_asprintf(req,
2199                                            "ldap://%s/%s",
2200                                            lpcfg_dnsdomain(lp_ctx),
2201                                            ldb_dn_get_linearized(msg->dn));
2202                 ret = ldb_module_send_referral(req, referral);
2203                 talloc_free(ac);
2204                 return ldb_module_done(req, NULL, NULL, ret);
2205         }
2206
2207         if (ret != LDB_SUCCESS) {
2208                 talloc_free(ac);
2209                 return ret;
2210         }
2211
2212         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t, req);
2213         if (ret != LDB_SUCCESS) {
2214                 talloc_free(ac);
2215                 return ret;
2216         }
2217
2218         /* TODO:
2219          * - replace the old object with the newly constructed one
2220          */
2221
2222         ac->is_urgent = is_urgent;
2223
2224         ret = ldb_build_mod_req(&down_req, ldb, ac,
2225                                 msg,
2226                                 req->controls,
2227                                 ac, replmd_op_callback,
2228                                 req);
2229         LDB_REQ_SET_LOCATION(down_req);
2230         if (ret != LDB_SUCCESS) {
2231                 talloc_free(ac);
2232                 return ret;
2233         }
2234
2235         /* If we are in functional level 2000, then
2236          * replmd_modify_handle_linked_attribs will have done
2237          * nothing */
2238         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
2239                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
2240                 if (ret != LDB_SUCCESS) {
2241                         talloc_free(ac);
2242                         return ret;
2243                 }
2244         }
2245
2246         talloc_steal(down_req, msg);
2247
2248         /* we only change whenChanged and uSNChanged if the seq_num
2249            has changed */
2250         if (ac->seq_num != 0) {
2251                 ret = add_time_element(msg, "whenChanged", t);
2252                 if (ret != LDB_SUCCESS) {
2253                         talloc_free(ac);
2254                         return ret;
2255                 }
2256
2257                 ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
2258                 if (ret != LDB_SUCCESS) {
2259                         talloc_free(ac);
2260                         return ret;
2261                 }
2262         }
2263
2264         /* go on with the call chain */
2265         return ldb_next_request(module, down_req);
2266 }
2267
2268 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2269
2270 /*
2271   handle a rename request
2272
2273   On a rename we need to do an extra ldb_modify which sets the
2274   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2275  */
2276 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2277 {
2278         struct ldb_context *ldb;
2279         struct replmd_replicated_request *ac;
2280         int ret;
2281         struct ldb_request *down_req;
2282
2283         /* do not manipulate our control entries */
2284         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2285                 return ldb_next_request(module, req);
2286         }
2287
2288         ldb = ldb_module_get_ctx(module);
2289
2290         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2291
2292         ac = replmd_ctx_init(module, req);
2293         if (ac == NULL) {
2294                 return ldb_module_oom(module);
2295         }
2296
2297         ret = ldb_build_rename_req(&down_req, ldb, ac,
2298                                    ac->req->op.rename.olddn,
2299                                    ac->req->op.rename.newdn,
2300                                    ac->req->controls,
2301                                    ac, replmd_rename_callback,
2302                                    ac->req);
2303         LDB_REQ_SET_LOCATION(down_req);
2304         if (ret != LDB_SUCCESS) {
2305                 talloc_free(ac);
2306                 return ret;
2307         }
2308
2309         /* go on with the call chain */
2310         return ldb_next_request(module, down_req);
2311 }
2312
2313 /* After the rename is compleated, update the whenchanged etc */
2314 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2315 {
2316         struct ldb_context *ldb;
2317         struct replmd_replicated_request *ac;
2318         struct ldb_request *down_req;
2319         struct ldb_message *msg;
2320         time_t t = time(NULL);
2321         int ret;
2322
2323         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2324         ldb = ldb_module_get_ctx(ac->module);
2325
2326         if (ares->error != LDB_SUCCESS) {
2327                 return ldb_module_done(ac->req, ares->controls,
2328                                         ares->response, ares->error);
2329         }
2330
2331         if (ares->type != LDB_REPLY_DONE) {
2332                 ldb_set_errstring(ldb,
2333                                   "invalid ldb_reply_type in callback");
2334                 talloc_free(ares);
2335                 return ldb_module_done(ac->req, NULL, NULL,
2336                                         LDB_ERR_OPERATIONS_ERROR);
2337         }
2338
2339         /* Get a sequence number from the backend */
2340         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2341         if (ret != LDB_SUCCESS) {
2342                 return ret;
2343         }
2344
2345         /* TODO:
2346          * - replace the old object with the newly constructed one
2347          */
2348
2349         msg = ldb_msg_new(ac);
2350         if (msg == NULL) {
2351                 ldb_oom(ldb);
2352                 return LDB_ERR_OPERATIONS_ERROR;
2353         }
2354
2355         msg->dn = ac->req->op.rename.newdn;
2356
2357         ret = ldb_build_mod_req(&down_req, ldb, ac,
2358                                 msg,
2359                                 req->controls,
2360                                 ac, replmd_op_callback,
2361                                 req);
2362         LDB_REQ_SET_LOCATION(down_req);
2363         if (ret != LDB_SUCCESS) {
2364                 talloc_free(ac);
2365                 return ret;
2366         }
2367         talloc_steal(down_req, msg);
2368
2369         ret = add_time_element(msg, "whenChanged", t);
2370         if (ret != LDB_SUCCESS) {
2371                 talloc_free(ac);
2372                 return ret;
2373         }
2374
2375         ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
2376         if (ret != LDB_SUCCESS) {
2377                 talloc_free(ac);
2378                 return ret;
2379         }
2380
2381         /* go on with the call chain - do the modify after the rename */
2382         return ldb_next_request(ac->module, down_req);
2383 }
2384
2385 /*
2386    remove links from objects that point at this object when an object
2387    is deleted
2388  */
2389 static int replmd_delete_remove_link(struct ldb_module *module,
2390                                      const struct dsdb_schema *schema,
2391                                      struct ldb_dn *dn,
2392                                      struct ldb_message_element *el,
2393                                      const struct dsdb_attribute *sa,
2394                                      struct ldb_request *parent)
2395 {
2396         unsigned int i;
2397         TALLOC_CTX *tmp_ctx = talloc_new(module);
2398         struct ldb_context *ldb = ldb_module_get_ctx(module);
2399
2400         for (i=0; i<el->num_values; i++) {
2401                 struct dsdb_dn *dsdb_dn;
2402                 NTSTATUS status;
2403                 int ret;
2404                 struct GUID guid2;
2405                 struct ldb_message *msg;
2406                 const struct dsdb_attribute *target_attr;
2407                 struct ldb_message_element *el2;
2408                 struct ldb_val dn_val;
2409
2410                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2411                         continue;
2412                 }
2413
2414                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2415                 if (!dsdb_dn) {
2416                         talloc_free(tmp_ctx);
2417                         return LDB_ERR_OPERATIONS_ERROR;
2418                 }
2419
2420                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2421                 if (!NT_STATUS_IS_OK(status)) {
2422                         talloc_free(tmp_ctx);
2423                         return LDB_ERR_OPERATIONS_ERROR;
2424                 }
2425
2426                 /* remove the link */
2427                 msg = ldb_msg_new(tmp_ctx);
2428                 if (!msg) {
2429                         ldb_module_oom(module);
2430                         talloc_free(tmp_ctx);
2431                         return LDB_ERR_OPERATIONS_ERROR;
2432                 }
2433
2434
2435                 msg->dn = dsdb_dn->dn;
2436
2437                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2438                 if (target_attr == NULL) {
2439                         continue;
2440                 }
2441
2442                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2443                 if (ret != LDB_SUCCESS) {
2444                         ldb_module_oom(module);
2445                         talloc_free(tmp_ctx);
2446                         return LDB_ERR_OPERATIONS_ERROR;
2447                 }
2448                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2449                 el2->values = &dn_val;
2450                 el2->num_values = 1;
2451
2452                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE, parent);
2453                 if (ret != LDB_SUCCESS) {
2454                         talloc_free(tmp_ctx);
2455                         return ret;
2456                 }
2457         }
2458         talloc_free(tmp_ctx);
2459         return LDB_SUCCESS;
2460 }
2461
2462
2463 /*
2464   handle update of replication meta data for deletion of objects
2465
2466   This also handles the mapping of delete to a rename operation
2467   to allow deletes to be replicated.
2468  */
2469 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2470 {
2471         int ret = LDB_ERR_OTHER;
2472         bool retb, disallow_move_on_delete;
2473         struct ldb_dn *old_dn, *new_dn;
2474         const char *rdn_name;
2475         const struct ldb_val *rdn_value, *new_rdn_value;
2476         struct GUID guid;
2477         struct ldb_context *ldb = ldb_module_get_ctx(module);
2478         const struct dsdb_schema *schema;
2479         struct ldb_message *msg, *old_msg;
2480         struct ldb_message_element *el;
2481         TALLOC_CTX *tmp_ctx;
2482         struct ldb_result *res, *parent_res;
2483         const char *preserved_attrs[] = {
2484                 /* yes, this really is a hard coded list. See MS-ADTS
2485                    section 3.1.1.5.5.1.1 */
2486                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2487                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2488                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2489                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2490                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2491                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2492                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2493                 "whenChanged", NULL};
2494         unsigned int i, el_count = 0;
2495         enum deletion_state { OBJECT_NOT_DELETED=1, OBJECT_DELETED=2, OBJECT_RECYCLED=3,
2496                                                 OBJECT_TOMBSTONE=4, OBJECT_REMOVED=5 };
2497         enum deletion_state deletion_state, next_deletion_state;
2498         bool enabled;
2499
2500         if (ldb_dn_is_special(req->op.del.dn)) {
2501                 return ldb_next_request(module, req);
2502         }
2503
2504         tmp_ctx = talloc_new(ldb);
2505         if (!tmp_ctx) {
2506                 ldb_oom(ldb);
2507                 return LDB_ERR_OPERATIONS_ERROR;
2508         }
2509
2510         schema = dsdb_get_schema(ldb, tmp_ctx);
2511         if (!schema) {
2512                 return LDB_ERR_OPERATIONS_ERROR;
2513         }
2514
2515         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2516
2517         /* we need the complete msg off disk, so we can work out which
2518            attributes need to be removed */
2519         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2520                                     DSDB_FLAG_NEXT_MODULE |
2521                                     DSDB_SEARCH_SHOW_RECYCLED |
2522                                     DSDB_SEARCH_REVEAL_INTERNALS |
2523                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT, req);
2524         if (ret != LDB_SUCCESS) {
2525                 talloc_free(tmp_ctx);
2526                 return ret;
2527         }
2528         old_msg = res->msgs[0];
2529
2530
2531         ret = dsdb_recyclebin_enabled(module, &enabled);
2532         if (ret != LDB_SUCCESS) {
2533                 talloc_free(tmp_ctx);
2534                 return ret;
2535         }
2536
2537         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2538                 if (!enabled) {
2539                         deletion_state = OBJECT_TOMBSTONE;
2540                         next_deletion_state = OBJECT_REMOVED;
2541                 } else if (ldb_msg_check_string_attribute(old_msg, "isRecycled", "TRUE")) {
2542                         deletion_state = OBJECT_RECYCLED;
2543                         next_deletion_state = OBJECT_REMOVED;
2544                 } else {
2545                         deletion_state = OBJECT_DELETED;
2546                         next_deletion_state = OBJECT_RECYCLED;
2547                 }
2548         } else {
2549                 deletion_state = OBJECT_NOT_DELETED;
2550                 if (enabled) {
2551                         next_deletion_state = OBJECT_DELETED;
2552                 } else {
2553                         next_deletion_state = OBJECT_TOMBSTONE;
2554                 }
2555         }
2556
2557         if (next_deletion_state == OBJECT_REMOVED) {
2558                 struct auth_session_info *session_info =
2559                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2560                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2561                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2562                                         ldb_dn_get_linearized(old_msg->dn));
2563                         return LDB_ERR_UNWILLING_TO_PERFORM;
2564                 }
2565
2566                 /* it is already deleted - really remove it this time */
2567                 talloc_free(tmp_ctx);
2568                 return ldb_next_request(module, req);
2569         }
2570
2571         rdn_name = ldb_dn_get_rdn_name(old_dn);
2572         rdn_value = ldb_dn_get_rdn_val(old_dn);
2573         if ((rdn_name == NULL) || (rdn_value == NULL)) {
2574                 talloc_free(tmp_ctx);
2575                 return ldb_operr(ldb);
2576         }
2577
2578         msg = ldb_msg_new(tmp_ctx);
2579         if (msg == NULL) {
2580                 ldb_module_oom(module);
2581                 talloc_free(tmp_ctx);
2582                 return LDB_ERR_OPERATIONS_ERROR;
2583         }
2584
2585         msg->dn = old_dn;
2586
2587         if (deletion_state == OBJECT_NOT_DELETED){
2588                 /* consider the SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE flag */
2589                 disallow_move_on_delete =
2590                         (ldb_msg_find_attr_as_int(old_msg, "systemFlags", 0)
2591                                 & SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE);
2592
2593                 /* work out where we will be renaming this object to */
2594                 if (!disallow_move_on_delete) {
2595                         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn,
2596                                                           &new_dn);
2597                         if (ret != LDB_SUCCESS) {
2598                                 /* this is probably an attempted delete on a partition
2599                                  * that doesn't allow delete operations, such as the
2600                                  * schema partition */
2601                                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2602                                                            ldb_dn_get_linearized(old_dn));
2603                                 talloc_free(tmp_ctx);
2604                                 return LDB_ERR_UNWILLING_TO_PERFORM;
2605                         }
2606                 } else {
2607                         new_dn = ldb_dn_get_parent(tmp_ctx, old_dn);
2608                         if (new_dn == NULL) {
2609                                 ldb_module_oom(module);
2610                                 talloc_free(tmp_ctx);
2611                                 return LDB_ERR_OPERATIONS_ERROR;
2612                         }
2613                 }
2614
2615                 /* get the objects GUID from the search we just did */
2616                 guid = samdb_result_guid(old_msg, "objectGUID");
2617
2618                 /* Add a formatted child */
2619                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2620                                                 rdn_name,
2621                                                 ldb_dn_escape_value(tmp_ctx, *rdn_value),
2622                                                 GUID_string(tmp_ctx, &guid));
2623                 if (!retb) {
2624                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2625                                         ldb_dn_get_linearized(new_dn)));
2626                         talloc_free(tmp_ctx);
2627                         return LDB_ERR_OPERATIONS_ERROR;
2628                 }
2629
2630                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2631                 if (ret != LDB_SUCCESS) {
2632                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2633                         ldb_module_oom(module);
2634                         talloc_free(tmp_ctx);
2635                         return ret;
2636                 }
2637                 msg->elements[el_count++].flags = LDB_FLAG_MOD_REPLACE;
2638         }
2639
2640         /*
2641           now we need to modify the object in the following ways:
2642
2643           - add isDeleted=TRUE
2644           - update rDN and name, with new rDN
2645           - remove linked attributes
2646           - remove objectCategory and sAMAccountType
2647           - remove attribs not on the preserved list
2648              - preserved if in above list, or is rDN
2649           - remove all linked attribs from this object
2650           - remove all links from other objects to this object
2651           - add lastKnownParent
2652           - update replPropertyMetaData?
2653
2654           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2655          */
2656
2657         /* we need the storage form of the parent GUID */
2658         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2659                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2660                                     DSDB_FLAG_NEXT_MODULE |
2661                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2662                                     DSDB_SEARCH_REVEAL_INTERNALS|
2663                                     DSDB_SEARCH_SHOW_RECYCLED, req);
2664         if (ret != LDB_SUCCESS) {
2665                 talloc_free(tmp_ctx);
2666                 return ret;
2667         }
2668
2669         if (deletion_state == OBJECT_NOT_DELETED){
2670                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2671                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2672                 if (ret != LDB_SUCCESS) {
2673                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2674                         ldb_module_oom(module);
2675                         talloc_free(tmp_ctx);
2676                         return ret;
2677                 }
2678                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2679         }
2680
2681         switch (next_deletion_state){
2682
2683         case OBJECT_DELETED:
2684
2685                 ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
2686                 if (ret != LDB_SUCCESS) {
2687                         DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
2688                         ldb_module_oom(module);
2689                         talloc_free(tmp_ctx);
2690                         return ret;
2691                 }
2692                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2693
2694                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_DELETE, NULL);
2695                 if (ret != LDB_SUCCESS) {
2696                         talloc_free(tmp_ctx);
2697                         ldb_module_oom(module);
2698                         return ret;
2699                 }
2700
2701                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_DELETE, NULL);
2702                 if (ret != LDB_SUCCESS) {
2703                         talloc_free(tmp_ctx);
2704                         ldb_module_oom(module);
2705                         return ret;
2706                 }
2707
2708                 break;
2709
2710         case OBJECT_RECYCLED:
2711         case OBJECT_TOMBSTONE:
2712
2713                 /* we also mark it as recycled, meaning this object can't be
2714                    recovered (we are stripping its attributes) */
2715                 if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2716                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2717                         if (ret != LDB_SUCCESS) {
2718                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2719                                 ldb_module_oom(module);
2720                                 talloc_free(tmp_ctx);
2721                                 return ret;
2722                         }
2723                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2724                 }
2725
2726                 /* work out which of the old attributes we will be removing */
2727                 for (i=0; i<old_msg->num_elements; i++) {
2728                         const struct dsdb_attribute *sa;
2729                         el = &old_msg->elements[i];
2730                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2731                         if (!sa) {
2732                                 talloc_free(tmp_ctx);
2733                                 return LDB_ERR_OPERATIONS_ERROR;
2734                         }
2735                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2736                                 /* don't remove the rDN */
2737                                 continue;
2738                         }
2739                         if (sa->linkID && sa->linkID & 1) {
2740                                 ret = replmd_delete_remove_link(module, schema, old_dn, el, sa, req);
2741                                 if (ret != LDB_SUCCESS) {
2742                                         talloc_free(tmp_ctx);
2743                                         return LDB_ERR_OPERATIONS_ERROR;
2744                                 }
2745                                 continue;
2746                         }
2747                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2748                                 continue;
2749                         }
2750                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2751                         if (ret != LDB_SUCCESS) {
2752                                 talloc_free(tmp_ctx);
2753                                 ldb_module_oom(module);
2754                                 return ret;
2755                         }
2756                 }
2757                 break;
2758
2759         default:
2760                 break;
2761         }
2762
2763         if (deletion_state == OBJECT_NOT_DELETED) {
2764                 const struct dsdb_attribute *sa;
2765
2766                 /* work out what the new rdn value is, for updating the
2767                    rDN and name fields */
2768                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2769                 if (new_rdn_value == NULL) {
2770                         talloc_free(tmp_ctx);
2771                         return ldb_operr(ldb);
2772                 }
2773
2774                 sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
2775                 if (!sa) {
2776                         talloc_free(tmp_ctx);
2777                         return LDB_ERR_OPERATIONS_ERROR;
2778                 }
2779
2780                 ret = ldb_msg_add_value(msg, sa->lDAPDisplayName, new_rdn_value,
2781                                         &el);
2782                 if (ret != LDB_SUCCESS) {
2783                         talloc_free(tmp_ctx);
2784                         return ret;
2785                 }
2786                 el->flags = LDB_FLAG_MOD_REPLACE;
2787
2788                 el = ldb_msg_find_element(old_msg, "name");
2789                 if (el) {
2790                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2791                         if (ret != LDB_SUCCESS) {
2792                                 talloc_free(tmp_ctx);
2793                                 return ret;
2794                         }
2795                         el->flags = LDB_FLAG_MOD_REPLACE;
2796                 }
2797         }
2798
2799         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE, req);
2800         if (ret != LDB_SUCCESS) {
2801                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2802                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2803                 talloc_free(tmp_ctx);
2804                 return ret;
2805         }
2806
2807         if (deletion_state == OBJECT_NOT_DELETED) {
2808                 /* now rename onto the new DN */
2809                 ret = dsdb_module_rename(module, old_dn, new_dn, DSDB_FLAG_NEXT_MODULE, req);
2810                 if (ret != LDB_SUCCESS){
2811                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2812                                  ldb_dn_get_linearized(old_dn),
2813                                  ldb_dn_get_linearized(new_dn),
2814                                  ldb_errstring(ldb)));
2815                         talloc_free(tmp_ctx);
2816                         return ret;
2817                 }
2818         }
2819
2820         talloc_free(tmp_ctx);
2821
2822         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2823 }
2824
2825
2826
2827 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2828 {
2829         return ret;
2830 }
2831
2832 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2833 {
2834         int ret = LDB_ERR_OTHER;
2835         /* TODO: do some error mapping */
2836         return ret;
2837 }
2838
2839 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2840 {
2841         struct ldb_context *ldb;
2842         struct ldb_request *change_req;
2843         enum ndr_err_code ndr_err;
2844         struct ldb_message *msg;
2845         struct replPropertyMetaDataBlob *md;
2846         struct ldb_val md_value;
2847         unsigned int i;
2848         int ret;
2849
2850         /*
2851          * TODO: check if the parent object exist
2852          */
2853
2854         /*
2855          * TODO: handle the conflict case where an object with the
2856          *       same name exist
2857          */
2858
2859         ldb = ldb_module_get_ctx(ar->module);
2860         msg = ar->objs->objects[ar->index_current].msg;
2861         md = ar->objs->objects[ar->index_current].meta_data;
2862
2863         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2864         if (ret != LDB_SUCCESS) {
2865                 return replmd_replicated_request_error(ar, ret);
2866         }
2867
2868         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2869         if (ret != LDB_SUCCESS) {
2870                 return replmd_replicated_request_error(ar, ret);
2871         }
2872
2873         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2874         if (ret != LDB_SUCCESS) {
2875                 return replmd_replicated_request_error(ar, ret);
2876         }
2877
2878         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2879         if (ret != LDB_SUCCESS) {
2880                 return replmd_replicated_request_error(ar, ret);
2881         }
2882
2883         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2884         if (ret != LDB_SUCCESS) {
2885                 return replmd_replicated_request_error(ar, ret);
2886         }
2887
2888         /* remove any message elements that have zero values */
2889         for (i=0; i<msg->num_elements; i++) {
2890                 struct ldb_message_element *el = &msg->elements[i];
2891
2892                 if (el->num_values == 0) {
2893                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2894                                  el->name));
2895                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2896                         msg->num_elements--;
2897                         i--;
2898                         continue;
2899                 }
2900         }
2901
2902         /*
2903          * the meta data array is already sorted by the caller
2904          */
2905         for (i=0; i < md->ctr.ctr1.count; i++) {
2906                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2907         }
2908         ndr_err = ndr_push_struct_blob(&md_value, msg, md,
2909                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2910         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2911                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2912                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2913         }
2914         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2915         if (ret != LDB_SUCCESS) {
2916                 return replmd_replicated_request_error(ar, ret);
2917         }
2918
2919         replmd_ldb_message_sort(msg, ar->schema);
2920
2921         if (DEBUGLVL(4)) {
2922                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2923                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2924                 talloc_free(s);
2925         }
2926
2927         ret = ldb_build_add_req(&change_req,
2928                                 ldb,
2929                                 ar,
2930                                 msg,
2931                                 ar->controls,
2932                                 ar,
2933                                 replmd_op_callback,
2934                                 ar->req);
2935         LDB_REQ_SET_LOCATION(change_req);
2936         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2937
2938         return ldb_next_request(ar->module, change_req);
2939 }
2940
2941 /*
2942    return true if an update is newer than an existing entry
2943    see section 5.11 of MS-ADTS
2944 */
2945 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2946                                    const struct GUID *update_invocation_id,
2947                                    uint32_t current_version,
2948                                    uint32_t update_version,
2949                                    uint32_t current_usn,
2950                                    uint32_t update_usn,
2951                                    NTTIME current_change_time,
2952                                    NTTIME update_change_time)
2953 {
2954         if (GUID_compare(update_invocation_id, current_invocation_id) == 0) {
2955                 if (update_usn != current_usn) {
2956                         return update_usn >= current_usn;
2957                 }
2958         }
2959         if (update_version != current_version) {
2960                 return update_version >= current_version;
2961         }
2962         if (update_change_time != current_change_time) {
2963                 return update_change_time >= current_change_time;
2964         }
2965         return GUID_compare(update_invocation_id, current_invocation_id) >= 0;
2966 }
2967
2968 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2969                                                   struct replPropertyMetaData1 *new_m)
2970 {
2971         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2972                                       &new_m->originating_invocation_id,
2973                                       cur_m->version,
2974                                       new_m->version,
2975                                       cur_m->originating_usn,
2976                                       new_m->originating_usn,
2977                                       cur_m->originating_change_time,
2978                                       new_m->originating_change_time);
2979 }
2980
2981 static struct replPropertyMetaData1 *
2982 replmd_replPropertyMetaData1_find_attid(struct replPropertyMetaDataBlob *md_blob,
2983                                         enum drsuapi_DsAttributeId attid)
2984 {
2985         uint32_t i;
2986         struct replPropertyMetaDataCtr1 *rpmd_ctr = &md_blob->ctr.ctr1;
2987
2988         for (i = 0; i < rpmd_ctr->count; i++) {
2989                 if (rpmd_ctr->array[i].attid == attid) {
2990                         return &rpmd_ctr->array[i];
2991                 }
2992         }
2993         return NULL;
2994 }
2995
2996
2997 /*
2998   handle renames that come in over DRS replication
2999  */
3000 static int replmd_replicated_handle_rename(struct replmd_replicated_request *ar,
3001                                            struct ldb_message *msg,
3002                                            struct replPropertyMetaDataBlob *rmd,
3003                                            struct replPropertyMetaDataBlob *omd,
3004                                            struct ldb_request *parent)
3005 {
3006         struct replPropertyMetaData1 *md_remote;
3007         struct replPropertyMetaData1 *md_local;
3008
3009         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) == 0) {
3010                 /* no rename */
3011                 return LDB_SUCCESS;
3012         }
3013
3014         /* now we need to check for double renames. We could have a
3015          * local rename pending which our replication partner hasn't
3016          * received yet. We choose which one wins by looking at the
3017          * attribute stamps on the two objects, the newer one wins
3018          */
3019         md_remote = replmd_replPropertyMetaData1_find_attid(rmd, DRSUAPI_ATTID_name);
3020         md_local  = replmd_replPropertyMetaData1_find_attid(omd, DRSUAPI_ATTID_name);
3021         /* if there is no name attribute then we have to assume the
3022            object we've received is in fact newer */
3023         if (!md_remote || !md_local ||
3024             replmd_replPropertyMetaData1_is_newer(md_local, md_remote)) {
3025                 DEBUG(4,("replmd_replicated_request rename %s => %s\n",
3026                          ldb_dn_get_linearized(ar->search_msg->dn),
3027                          ldb_dn_get_linearized(msg->dn)));
3028                 /* pass rename to the next module
3029                  * so it doesn't appear as an originating update */
3030                 return dsdb_module_rename(ar->module,
3031                                           ar->search_msg->dn, msg->dn,
3032                                           DSDB_FLAG_NEXT_MODULE | DSDB_MODIFY_RELAX, parent);
3033         }
3034
3035         /* we're going to keep our old object */
3036         DEBUG(4,(__location__ ": Keeping object %s and rejecting older rename to %s\n",
3037                  ldb_dn_get_linearized(ar->search_msg->dn),
3038                  ldb_dn_get_linearized(msg->dn)));
3039         return LDB_SUCCESS;
3040 }
3041
3042
3043 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
3044 {
3045         struct ldb_context *ldb;
3046         struct ldb_request *change_req;
3047         enum ndr_err_code ndr_err;
3048         struct ldb_message *msg;
3049         struct replPropertyMetaDataBlob *rmd;
3050         struct replPropertyMetaDataBlob omd;
3051         const struct ldb_val *omd_value;
3052         struct replPropertyMetaDataBlob nmd;
3053         struct ldb_val nmd_value;
3054         unsigned int i;
3055         uint32_t j,ni=0;
3056         unsigned int removed_attrs = 0;
3057         int ret;
3058
3059         ldb = ldb_module_get_ctx(ar->module);
3060         msg = ar->objs->objects[ar->index_current].msg;
3061         rmd = ar->objs->objects[ar->index_current].meta_data;
3062         ZERO_STRUCT(omd);
3063         omd.version = 1;
3064
3065         /* find existing meta data */
3066         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
3067         if (omd_value) {
3068                 ndr_err = ndr_pull_struct_blob(omd_value, ar, &omd,
3069                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
3070                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3071                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3072                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3073                 }
3074
3075                 if (omd.version != 1) {
3076                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3077                 }
3078         }
3079
3080         /* handle renames that come in over DRS */
3081         ret = replmd_replicated_handle_rename(ar, msg, rmd, &omd, ar->req);
3082         if (ret != LDB_SUCCESS) {
3083                 ldb_debug(ldb, LDB_DEBUG_FATAL,
3084                           "replmd_replicated_request rename %s => %s failed - %s\n",
3085                           ldb_dn_get_linearized(ar->search_msg->dn),
3086                           ldb_dn_get_linearized(msg->dn),
3087                           ldb_errstring(ldb));
3088                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
3089         }
3090
3091         ZERO_STRUCT(nmd);
3092         nmd.version = 1;
3093         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
3094         nmd.ctr.ctr1.array = talloc_array(ar,
3095                                           struct replPropertyMetaData1,
3096                                           nmd.ctr.ctr1.count);
3097         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3098
3099         /* first copy the old meta data */
3100         for (i=0; i < omd.ctr.ctr1.count; i++) {
3101                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
3102                 ni++;
3103         }
3104
3105         /* now merge in the new meta data */
3106         for (i=0; i < rmd->ctr.ctr1.count; i++) {
3107                 bool found = false;
3108
3109                 for (j=0; j < ni; j++) {
3110                         bool cmp;
3111
3112                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
3113                                 continue;
3114                         }
3115
3116                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
3117                                                                     &rmd->ctr.ctr1.array[i]);
3118                         if (cmp) {
3119                                 /* replace the entry */
3120                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
3121                                 found = true;
3122                                 break;
3123                         }
3124
3125                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTID_instanceType) {
3126                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
3127                                          msg->elements[i-removed_attrs].name,
3128                                          ldb_dn_get_linearized(msg->dn),
3129                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
3130                         }
3131
3132                         /* we don't want to apply this change so remove the attribute */
3133                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
3134                         removed_attrs++;
3135
3136                         found = true;
3137                         break;
3138                 }
3139
3140                 if (found) continue;
3141
3142                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
3143                 ni++;
3144         }
3145
3146         /*
3147          * finally correct the size of the meta_data array
3148          */
3149         nmd.ctr.ctr1.count = ni;
3150
3151         /*
3152          * the rdn attribute (the alias for the name attribute),
3153          * 'cn' for most objects is the last entry in the meta data array
3154          * we have stored
3155          *
3156          * sort the new meta data array
3157          */
3158         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
3159         if (ret != LDB_SUCCESS) {
3160                 return ret;
3161         }
3162
3163         /*
3164          * check if some replicated attributes left, otherwise skip the ldb_modify() call
3165          */
3166         if (msg->num_elements == 0) {
3167                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
3168                           ar->index_current);
3169
3170                 ar->index_current++;
3171                 return replmd_replicated_apply_next(ar);
3172         }
3173
3174         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
3175                   ar->index_current, msg->num_elements);
3176
3177         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
3178         if (ret != LDB_SUCCESS) {
3179                 return replmd_replicated_request_error(ar, ret);
3180         }
3181
3182         for (i=0; i<ni; i++) {
3183                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
3184         }
3185
3186         /* create the meta data value */
3187         ndr_err = ndr_push_struct_blob(&nmd_value, msg, &nmd,
3188                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
3189         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3190                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3191                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3192         }
3193
3194         /*
3195          * when we know that we'll modify the record, add the whenChanged, uSNChanged
3196          * and replPopertyMetaData attributes
3197          */
3198         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
3199         if (ret != LDB_SUCCESS) {
3200                 return replmd_replicated_request_error(ar, ret);
3201         }
3202         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
3203         if (ret != LDB_SUCCESS) {
3204                 return replmd_replicated_request_error(ar, ret);
3205         }
3206         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
3207         if (ret != LDB_SUCCESS) {
3208                 return replmd_replicated_request_error(ar, ret);
3209         }
3210
3211         replmd_ldb_message_sort(msg, ar->schema);
3212
3213         /* we want to replace the old values */
3214         for (i=0; i < msg->num_elements; i++) {
3215                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
3216         }
3217
3218         if (DEBUGLVL(4)) {
3219                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3220                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
3221                 talloc_free(s);
3222         }
3223
3224         ret = ldb_build_mod_req(&change_req,
3225                                 ldb,
3226                                 ar,
3227                                 msg,
3228                                 ar->controls,
3229                                 ar,
3230                                 replmd_op_callback,
3231                                 ar->req);
3232         LDB_REQ_SET_LOCATION(change_req);
3233         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3234
3235         return ldb_next_request(ar->module, change_req);
3236 }
3237
3238 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
3239                                                    struct ldb_reply *ares)
3240 {
3241         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3242                                                struct replmd_replicated_request);
3243         int ret;
3244
3245         if (!ares) {
3246                 return ldb_module_done(ar->req, NULL, NULL,
3247                                         LDB_ERR_OPERATIONS_ERROR);
3248         }
3249         if (ares->error != LDB_SUCCESS &&
3250             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3251                 return ldb_module_done(ar->req, ares->controls,
3252                                         ares->response, ares->error);
3253         }
3254
3255         switch (ares->type) {
3256         case LDB_REPLY_ENTRY:
3257                 ar->search_msg = talloc_steal(ar, ares->message);
3258                 break;
3259
3260         case LDB_REPLY_REFERRAL:
3261                 /* we ignore referrals */
3262                 break;
3263
3264         case LDB_REPLY_DONE:
3265                 if (ar->search_msg != NULL) {
3266                         ret = replmd_replicated_apply_merge(ar);
3267                 } else {
3268                         ret = replmd_replicated_apply_add(ar);
3269                 }
3270                 if (ret != LDB_SUCCESS) {
3271                         return ldb_module_done(ar->req, NULL, NULL, ret);
3272                 }
3273         }
3274
3275         talloc_free(ares);
3276         return LDB_SUCCESS;
3277 }
3278
3279 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
3280
3281 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
3282 {
3283         struct ldb_context *ldb;
3284         int ret;
3285         char *tmp_str;
3286         char *filter;
3287         struct ldb_request *search_req;
3288         struct ldb_search_options_control *options;
3289
3290         if (ar->index_current >= ar->objs->num_objects) {
3291                 /* done with it, go to next stage */
3292                 return replmd_replicated_uptodate_vector(ar);
3293         }
3294
3295         ldb = ldb_module_get_ctx(ar->module);
3296         ar->search_msg = NULL;
3297
3298         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
3299         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3300
3301         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
3302         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3303         talloc_free(tmp_str);
3304
3305         ret = ldb_build_search_req(&search_req,
3306                                    ldb,
3307                                    ar,
3308                                    NULL,
3309                                    LDB_SCOPE_SUBTREE,
3310                                    filter,
3311                                    NULL,
3312                                    NULL,
3313                                    ar,
3314                                    replmd_replicated_apply_search_callback,
3315                                    ar->req);
3316         LDB_REQ_SET_LOCATION(search_req);
3317
3318         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_RECYCLED_OID,
3319                                       true, NULL);
3320         if (ret != LDB_SUCCESS) {
3321                 return ret;
3322         }
3323
3324         /* we need to cope with cross-partition links, so search for
3325            the GUID over all partitions */
3326         options = talloc(search_req, struct ldb_search_options_control);
3327         if (options == NULL) {
3328                 DEBUG(0, (__location__ ": out of memory\n"));
3329                 return LDB_ERR_OPERATIONS_ERROR;
3330         }
3331         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
3332
3333         ret = ldb_request_add_control(search_req,
3334                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
3335                                       true, options);
3336         if (ret != LDB_SUCCESS) {
3337                 return ret;
3338         }
3339
3340         return ldb_next_request(ar->module, search_req);
3341 }
3342
3343 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
3344                                                       struct ldb_reply *ares)
3345 {
3346         struct ldb_context *ldb;
3347         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3348                                                struct replmd_replicated_request);
3349         ldb = ldb_module_get_ctx(ar->module);
3350
3351         if (!ares) {
3352                 return ldb_module_done(ar->req, NULL, NULL,
3353                                         LDB_ERR_OPERATIONS_ERROR);
3354         }
3355         if (ares->error != LDB_SUCCESS) {
3356                 return ldb_module_done(ar->req, ares->controls,
3357                                         ares->response, ares->error);
3358         }
3359
3360         if (ares->type != LDB_REPLY_DONE) {
3361                 ldb_set_errstring(ldb, "Invalid reply type\n!");
3362                 return ldb_module_done(ar->req, NULL, NULL,
3363                                         LDB_ERR_OPERATIONS_ERROR);
3364         }
3365
3366         talloc_free(ares);
3367
3368         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3369 }
3370
3371 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3372 {
3373         struct ldb_context *ldb;
3374         struct ldb_request *change_req;
3375         enum ndr_err_code ndr_err;
3376         struct ldb_message *msg;
3377         struct replUpToDateVectorBlob ouv;
3378         const struct ldb_val *ouv_value;
3379         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3380         struct replUpToDateVectorBlob nuv;
3381         struct ldb_val nuv_value;
3382         struct ldb_message_element *nuv_el = NULL;
3383         const struct GUID *our_invocation_id;
3384         struct ldb_message_element *orf_el = NULL;
3385         struct repsFromToBlob nrf;
3386         struct ldb_val *nrf_value = NULL;
3387         struct ldb_message_element *nrf_el = NULL;
3388         unsigned int i;
3389         uint32_t j,ni=0;
3390         bool found = false;
3391         time_t t = time(NULL);
3392         NTTIME now;
3393         int ret;
3394         uint32_t instanceType;
3395
3396         ldb = ldb_module_get_ctx(ar->module);
3397         ruv = ar->objs->uptodateness_vector;
3398         ZERO_STRUCT(ouv);
3399         ouv.version = 2;
3400         ZERO_STRUCT(nuv);
3401         nuv.version = 2;
3402
3403         unix_to_nt_time(&now, t);
3404
3405         instanceType = ldb_msg_find_attr_as_uint(ar->search_msg, "instanceType", 0);
3406         if (! (instanceType & INSTANCE_TYPE_IS_NC_HEAD)) {
3407                 DEBUG(4,(__location__ ": Skipping UDV and repsFrom update as not NC root: %s\n",
3408                          ldb_dn_get_linearized(ar->search_msg->dn)));
3409                 return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3410         }
3411
3412         /*
3413          * first create the new replUpToDateVector
3414          */
3415         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3416         if (ouv_value) {
3417                 ndr_err = ndr_pull_struct_blob(ouv_value, ar, &ouv,
3418                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3419                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3420                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3421                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3422                 }
3423
3424                 if (ouv.version != 2) {
3425                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3426                 }
3427         }
3428
3429         /*
3430          * the new uptodateness vector will at least
3431          * contain 1 entry, one for the source_dsa
3432          *
3433          * plus optional values from our old vector and the one from the source_dsa
3434          */
3435         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3436         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3437         nuv.ctr.ctr2.cursors = talloc_array(ar,
3438                                             struct drsuapi_DsReplicaCursor2,
3439                                             nuv.ctr.ctr2.count);
3440         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3441
3442         /* first copy the old vector */
3443         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3444                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3445                 ni++;
3446         }
3447
3448         /* get our invocation_id if we have one already attached to the ldb */
3449         our_invocation_id = samdb_ntds_invocation_id(ldb);
3450
3451         /* merge in the source_dsa vector is available */
3452         for (i=0; (ruv && i < ruv->count); i++) {
3453                 found = false;
3454
3455                 if (our_invocation_id &&
3456                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3457                                our_invocation_id)) {
3458                         continue;
3459                 }
3460
3461                 for (j=0; j < ni; j++) {
3462                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3463                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3464                                 continue;
3465                         }
3466
3467                         found = true;
3468
3469                         /*
3470                          * we update only the highest_usn and not the latest_sync_success time,
3471                          * because the last success stands for direct replication
3472                          */
3473                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3474                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3475                         }
3476                         break;
3477                 }
3478
3479                 if (found) continue;
3480
3481                 /* if it's not there yet, add it */
3482                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3483                 ni++;
3484         }
3485
3486         /*
3487          * merge in the current highwatermark for the source_dsa
3488          */
3489         found = false;
3490         for (j=0; j < ni; j++) {
3491                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3492                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3493                         continue;
3494                 }
3495
3496                 found = true;
3497
3498                 /*
3499                  * here we update the highest_usn and last_sync_success time
3500                  * because we're directly replicating from the source_dsa
3501                  *
3502                  * and use the tmp_highest_usn because this is what we have just applied
3503                  * to our ldb
3504                  */
3505                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3506                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3507                 break;
3508         }
3509         if (!found) {
3510                 /*
3511                  * here we update the highest_usn and last_sync_success time
3512                  * because we're directly replicating from the source_dsa
3513                  *
3514                  * and use the tmp_highest_usn because this is what we have just applied
3515                  * to our ldb
3516                  */
3517                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3518                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3519                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3520                 ni++;
3521         }
3522
3523         /*
3524          * finally correct the size of the cursors array
3525          */
3526         nuv.ctr.ctr2.count = ni;
3527
3528         /*
3529          * sort the cursors
3530          */
3531         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
3532
3533         /*
3534          * create the change ldb_message
3535          */
3536         msg = ldb_msg_new(ar);
3537         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3538         msg->dn = ar->search_msg->dn;
3539
3540         ndr_err = ndr_push_struct_blob(&nuv_value, msg, &nuv,
3541                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3542         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3543                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3544                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3545         }
3546         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3547         if (ret != LDB_SUCCESS) {
3548                 return replmd_replicated_request_error(ar, ret);
3549         }
3550         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3551
3552         /*
3553          * now create the new repsFrom value from the given repsFromTo1 structure
3554          */
3555         ZERO_STRUCT(nrf);
3556         nrf.version                                     = 1;
3557         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3558         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3559
3560         /*
3561          * first see if we already have a repsFrom value for the current source dsa
3562          * if so we'll later replace this value
3563          */
3564         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3565         if (orf_el) {
3566                 for (i=0; i < orf_el->num_values; i++) {
3567                         struct repsFromToBlob *trf;
3568
3569                         trf = talloc(ar, struct repsFromToBlob);
3570                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3571
3572                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, trf,
3573                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3574                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3575                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3576                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3577                         }
3578
3579                         if (trf->version != 1) {
3580                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3581                         }
3582
3583                         /*
3584                          * we compare the source dsa objectGUID not the invocation_id
3585                          * because we want only one repsFrom value per source dsa
3586                          * and when the invocation_id of the source dsa has changed we don't need
3587                          * the old repsFrom with the old invocation_id
3588                          */
3589                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3590                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3591                                 talloc_free(trf);
3592                                 continue;
3593                         }
3594
3595                         talloc_free(trf);
3596                         nrf_value = &orf_el->values[i];
3597                         break;
3598                 }
3599
3600                 /*
3601                  * copy over all old values to the new ldb_message
3602                  */
3603                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3604                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3605                 *nrf_el = *orf_el;
3606         }
3607
3608         /*
3609          * if we haven't found an old repsFrom value for the current source dsa
3610          * we'll add a new value
3611          */
3612         if (!nrf_value) {
3613                 struct ldb_val zero_value;
3614                 ZERO_STRUCT(zero_value);
3615                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3616                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3617
3618                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3619         }
3620
3621         /* we now fill the value which is already attached to ldb_message */
3622         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3623                                        &nrf,
3624                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3625         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3626                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3627                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3628         }
3629
3630         /*
3631          * the ldb_message_element for the attribute, has all the old values and the new one
3632          * so we'll replace the whole attribute with all values
3633          */
3634         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3635
3636         if (DEBUGLVL(4)) {
3637                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3638                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3639                 talloc_free(s);
3640         }
3641
3642         /* prepare the ldb_modify() request */
3643         ret = ldb_build_mod_req(&change_req,
3644                                 ldb,
3645                                 ar,
3646                                 msg,
3647                                 ar->controls,
3648                                 ar,
3649                                 replmd_replicated_uptodate_modify_callback,
3650                                 ar->req);
3651         LDB_REQ_SET_LOCATION(change_req);
3652         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3653
3654         return ldb_next_request(ar->module, change_req);
3655 }
3656
3657 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3658                                                       struct ldb_reply *ares)
3659 {
3660         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3661                                                struct replmd_replicated_request);
3662         int ret;
3663
3664         if (!ares) {
3665                 return ldb_module_done(ar->req, NULL, NULL,
3666                                         LDB_ERR_OPERATIONS_ERROR);
3667         }
3668         if (ares->error != LDB_SUCCESS &&
3669             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3670                 return ldb_module_done(ar->req, ares->controls,
3671                                         ares->response, ares->error);
3672         }
3673
3674         switch (ares->type) {
3675         case LDB_REPLY_ENTRY:
3676                 ar->search_msg = talloc_steal(ar, ares->message);
3677                 break;
3678
3679         case LDB_REPLY_REFERRAL:
3680                 /* we ignore referrals */
3681                 break;
3682
3683         case LDB_REPLY_DONE:
3684                 if (ar->search_msg == NULL) {
3685                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3686                 } else {
3687                         ret = replmd_replicated_uptodate_modify(ar);
3688                 }
3689                 if (ret != LDB_SUCCESS) {
3690                         return ldb_module_done(ar->req, NULL, NULL, ret);
3691                 }
3692         }
3693
3694         talloc_free(ares);
3695         return LDB_SUCCESS;
3696 }
3697
3698
3699 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3700 {
3701         struct ldb_context *ldb;
3702         int ret;
3703         static const char *attrs[] = {
3704                 "replUpToDateVector",
3705                 "repsFrom",
3706                 "instanceType",
3707                 NULL
3708         };
3709         struct ldb_request *search_req;
3710
3711         ldb = ldb_module_get_ctx(ar->module);
3712         ar->search_msg = NULL;
3713
3714         ret = ldb_build_search_req(&search_req,
3715                                    ldb,
3716                                    ar,
3717                                    ar->objs->partition_dn,
3718                                    LDB_SCOPE_BASE,
3719                                    "(objectClass=*)",
3720                                    attrs,
3721                                    NULL,
3722                                    ar,
3723                                    replmd_replicated_uptodate_search_callback,
3724                                    ar->req);
3725         LDB_REQ_SET_LOCATION(search_req);
3726         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3727
3728         return ldb_next_request(ar->module, search_req);
3729 }
3730
3731
3732
3733 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3734 {
3735         struct ldb_context *ldb;
3736         struct dsdb_extended_replicated_objects *objs;
3737         struct replmd_replicated_request *ar;
3738         struct ldb_control **ctrls;
3739         int ret;
3740         uint32_t i;
3741         struct replmd_private *replmd_private =
3742                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3743
3744         ldb = ldb_module_get_ctx(module);
3745
3746         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3747
3748         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3749         if (!objs) {
3750                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3751                 return LDB_ERR_PROTOCOL_ERROR;
3752         }
3753
3754         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3755                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3756                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3757                 return LDB_ERR_PROTOCOL_ERROR;
3758         }
3759
3760         ar = replmd_ctx_init(module, req);
3761         if (!ar)
3762                 return LDB_ERR_OPERATIONS_ERROR;
3763
3764         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3765         ar->apply_mode = true;
3766         ar->objs = objs;
3767         ar->schema = dsdb_get_schema(ldb, ar);
3768         if (!ar->schema) {
3769                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3770                 talloc_free(ar);
3771                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3772                 return LDB_ERR_CONSTRAINT_VIOLATION;
3773         }
3774
3775         ctrls = req->controls;
3776
3777         if (req->controls) {
3778                 req->controls = talloc_memdup(ar, req->controls,
3779                                               talloc_get_size(req->controls));
3780                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3781         }
3782
3783         /* This allows layers further down to know if a change came in over replication */
3784         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3785         if (ret != LDB_SUCCESS) {
3786                 return ret;
3787         }
3788
3789         /* If this change contained linked attributes in the body
3790          * (rather than in the links section) we need to update
3791          * backlinks in linked_attributes */
3792         ret = ldb_request_add_control(req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
3793         if (ret != LDB_SUCCESS) {
3794                 return ret;
3795         }
3796
3797         ar->controls = req->controls;
3798         req->controls = ctrls;
3799
3800         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3801
3802         /* save away the linked attributes for the end of the
3803            transaction */
3804         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3805                 struct la_entry *la_entry;
3806
3807                 if (replmd_private->la_ctx == NULL) {
3808                         replmd_private->la_ctx = talloc_new(replmd_private);
3809                 }
3810                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3811                 if (la_entry == NULL) {
3812                         ldb_oom(ldb);
3813                         return LDB_ERR_OPERATIONS_ERROR;
3814                 }
3815                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3816                 if (la_entry->la == NULL) {
3817                         talloc_free(la_entry);
3818                         ldb_oom(ldb);
3819                         return LDB_ERR_OPERATIONS_ERROR;
3820                 }
3821                 *la_entry->la = ar->objs->linked_attributes[i];
3822
3823                 /* we need to steal the non-scalars so they stay
3824                    around until the end of the transaction */
3825                 talloc_steal(la_entry->la, la_entry->la->identifier);
3826                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3827
3828                 DLIST_ADD(replmd_private->la_list, la_entry);
3829         }
3830
3831         return replmd_replicated_apply_next(ar);
3832 }
3833
3834 /*
3835   process one linked attribute structure
3836  */
3837 static int replmd_process_linked_attribute(struct ldb_module *module,
3838                                            struct la_entry *la_entry,
3839                                            struct ldb_request *parent)
3840 {
3841         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3842         struct ldb_context *ldb = ldb_module_get_ctx(module);
3843         struct ldb_message *msg;
3844         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3845         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
3846         int ret;
3847         const struct dsdb_attribute *attr;
3848         struct dsdb_dn *dsdb_dn;
3849         uint64_t seq_num = 0;
3850         struct ldb_message_element *old_el;
3851         WERROR status;
3852         time_t t = time(NULL);
3853         struct ldb_result *res;
3854         const char *attrs[2];
3855         struct parsed_dn *pdn_list, *pdn;
3856         struct GUID guid = GUID_zero();
3857         NTSTATUS ntstatus;
3858         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3859         const struct GUID *our_invocation_id;
3860
3861 /*
3862 linked_attributes[0]:
3863      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3864         identifier               : *
3865             identifier: struct drsuapi_DsReplicaObjectIdentifier
3866                 __ndr_size               : 0x0000003a (58)
3867                 __ndr_size_sid           : 0x00000000 (0)
3868                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3869                 sid                      : S-0-0
3870                 __ndr_size_dn            : 0x00000000 (0)
3871                 dn                       : ''
3872         attid                    : DRSUAPI_ATTID_member (0x1F)
3873         value: struct drsuapi_DsAttributeValue
3874             __ndr_size               : 0x0000007e (126)
3875             blob                     : *
3876                 blob                     : DATA_BLOB length=126
3877         flags                    : 0x00000001 (1)
3878                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3879         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3880         meta_data: struct drsuapi_DsReplicaMetaData
3881             version                  : 0x00000015 (21)
3882             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3883             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3884             originating_usn          : 0x000000000001e19c (123292)
3885
3886 (for cases where the link is to a normal DN)
3887      &target: struct drsuapi_DsReplicaObjectIdentifier3
3888         __ndr_size               : 0x0000007e (126)
3889         __ndr_size_sid           : 0x0000001c (28)
3890         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3891         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3892         __ndr_size_dn            : 0x00000022 (34)
3893         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3894  */
3895
3896         /* find the attribute being modified */
3897         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3898         if (attr == NULL) {
3899                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3900                 talloc_free(tmp_ctx);
3901                 return LDB_ERR_OPERATIONS_ERROR;
3902         }
3903
3904         attrs[0] = attr->lDAPDisplayName;
3905         attrs[1] = NULL;
3906
3907         /* get the existing message from the db for the object with
3908            this GUID, returning attribute being modified. We will then
3909            use this msg as the basis for a modify call */
3910         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3911                                  DSDB_FLAG_NEXT_MODULE |
3912                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3913                                  DSDB_SEARCH_SHOW_RECYCLED |
3914                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3915                                  DSDB_SEARCH_REVEAL_INTERNALS,
3916                                  parent,
3917                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3918         if (ret != LDB_SUCCESS) {
3919                 talloc_free(tmp_ctx);
3920                 return ret;
3921         }
3922         if (res->count != 1) {
3923                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3924                                        GUID_string(tmp_ctx, &la->identifier->guid));
3925                 talloc_free(tmp_ctx);
3926                 return LDB_ERR_NO_SUCH_OBJECT;
3927         }
3928         msg = res->msgs[0];
3929
3930         if (msg->num_elements == 0) {
3931                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3932                 if (ret != LDB_SUCCESS) {
3933                         ldb_module_oom(module);
3934                         talloc_free(tmp_ctx);
3935                         return LDB_ERR_OPERATIONS_ERROR;
3936                 }
3937         } else {
3938                 old_el = &msg->elements[0];
3939                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3940         }
3941
3942         /* parse the existing links */
3943         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid, parent);
3944         if (ret != LDB_SUCCESS) {
3945                 talloc_free(tmp_ctx);
3946                 return ret;
3947         }
3948
3949         /* get our invocationId */
3950         our_invocation_id = samdb_ntds_invocation_id(ldb);
3951         if (!our_invocation_id) {
3952                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3953                 talloc_free(tmp_ctx);
3954                 return LDB_ERR_OPERATIONS_ERROR;
3955         }
3956
3957         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
3958         if (ret != LDB_SUCCESS) {
3959                 talloc_free(tmp_ctx);
3960                 return ret;
3961         }
3962
3963         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3964         if (!W_ERROR_IS_OK(status)) {
3965                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3966                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3967                 return LDB_ERR_OPERATIONS_ERROR;
3968         }
3969
3970         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3971         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3972                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3973                                        old_el->name,
3974                                        ldb_dn_get_linearized(dsdb_dn->dn),
3975                                        ldb_dn_get_linearized(msg->dn));
3976                 return LDB_ERR_OPERATIONS_ERROR;
3977         }
3978
3979         /* re-resolve the DN by GUID, as the DRS server may give us an
3980            old DN value */
3981         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn, parent);
3982         if (ret != LDB_SUCCESS) {
3983                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s",
3984                          GUID_string(tmp_ctx, &guid),
3985                          ldb_dn_get_linearized(dsdb_dn->dn)));
3986         }
3987
3988         /* see if this link already exists */
3989         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3990         if (pdn != NULL) {
3991                 /* see if this update is newer than what we have already */
3992                 struct GUID invocation_id = GUID_zero();
3993                 uint32_t version = 0;
3994                 uint32_t originating_usn = 0;
3995                 NTTIME change_time = 0;
3996                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3997
3998                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3999                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
4000                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &originating_usn, "RMD_ORIGINATING_USN");
4001                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
4002
4003                 if (!replmd_update_is_newer(&invocation_id,
4004                                             &la->meta_data.originating_invocation_id,
4005                                             version,
4006                                             la->meta_data.version,
4007                                             originating_usn,
4008                                             la->meta_data.originating_usn,
4009                                             change_time,
4010                                             la->meta_data.originating_change_time)) {
4011                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
4012                                  old_el->name, ldb_dn_get_linearized(msg->dn),
4013                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
4014                         talloc_free(tmp_ctx);
4015                         return LDB_SUCCESS;
4016                 }
4017
4018                 /* get a seq_num for this change */
4019                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
4020                 if (ret != LDB_SUCCESS) {
4021                         talloc_free(tmp_ctx);
4022                         return ret;
4023                 }
4024
4025                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
4026                         /* remove the existing backlink */
4027                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
4028                         if (ret != LDB_SUCCESS) {
4029                                 talloc_free(tmp_ctx);
4030                                 return ret;
4031                         }
4032                 }
4033
4034                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
4035                                            &la->meta_data.originating_invocation_id,
4036                                            la->meta_data.originating_usn, seq_num,
4037                                            la->meta_data.originating_change_time,
4038                                            la->meta_data.version,
4039                                            !active);
4040                 if (ret != LDB_SUCCESS) {
4041                         talloc_free(tmp_ctx);
4042                         return ret;
4043                 }
4044
4045                 if (active) {
4046                         /* add the new backlink */
4047                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
4048                         if (ret != LDB_SUCCESS) {
4049                                 talloc_free(tmp_ctx);
4050                                 return ret;
4051                         }
4052                 }
4053         } else {
4054                 /* get a seq_num for this change */
4055                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
4056                 if (ret != LDB_SUCCESS) {
4057                         talloc_free(tmp_ctx);
4058                         return ret;
4059                 }
4060
4061                 old_el->values = talloc_realloc(msg->elements, old_el->values,
4062                                                 struct ldb_val, old_el->num_values+1);
4063                 if (!old_el->values) {
4064                         ldb_module_oom(module);
4065                         return LDB_ERR_OPERATIONS_ERROR;
4066                 }
4067                 old_el->num_values++;
4068
4069                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
4070                                           &la->meta_data.originating_invocation_id,
4071                                           la->meta_data.originating_usn, seq_num,
4072                                           la->meta_data.originating_change_time,
4073                                           la->meta_data.version,
4074                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
4075                 if (ret != LDB_SUCCESS) {
4076                         talloc_free(tmp_ctx);
4077                         return ret;
4078                 }
4079
4080                 if (active) {
4081                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
4082                                                   true, attr, false);
4083                         if (ret != LDB_SUCCESS) {
4084                                 talloc_free(tmp_ctx);
4085                                 return ret;
4086                         }
4087                 }
4088         }
4089
4090         /* we only change whenChanged and uSNChanged if the seq_num
4091            has changed */
4092         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
4093                 talloc_free(tmp_ctx);
4094                 return ldb_operr(ldb);
4095         }
4096
4097         if (add_uint64_element(ldb, msg, "uSNChanged",
4098                                seq_num) != LDB_SUCCESS) {
4099                 talloc_free(tmp_ctx);
4100                 return ldb_operr(ldb);
4101         }
4102
4103         old_el = ldb_msg_find_element(msg, attr->lDAPDisplayName);
4104         if (old_el == NULL) {
4105                 talloc_free(tmp_ctx);
4106                 return ldb_operr(ldb);
4107         }
4108
4109         ret = dsdb_check_single_valued_link(attr, old_el);
4110         if (ret != LDB_SUCCESS) {
4111                 talloc_free(tmp_ctx);
4112                 return ret;
4113         }
4114
4115         old_el->flags |= LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK;
4116
4117         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE, parent);
4118         if (ret != LDB_SUCCESS) {
4119                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
4120                           ldb_errstring(ldb),
4121                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
4122                 talloc_free(tmp_ctx);
4123                 return ret;
4124         }
4125
4126         talloc_free(tmp_ctx);
4127
4128         return ret;
4129 }
4130
4131 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
4132 {
4133         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
4134                 return replmd_extended_replicated_objects(module, req);
4135         }
4136
4137         return ldb_next_request(module, req);
4138 }
4139
4140
4141 /*
4142   we hook into the transaction operations to allow us to
4143   perform the linked attribute updates at the end of the whole
4144   transaction. This allows a forward linked attribute to be created
4145   before the object is created. During a vampire, w2k8 sends us linked
4146   attributes before the objects they are part of.
4147  */
4148 static int replmd_start_transaction(struct ldb_module *module)
4149 {
4150         /* create our private structure for this transaction */
4151         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
4152                                                                 struct replmd_private);
4153         replmd_txn_cleanup(replmd_private);
4154
4155         /* free any leftover mod_usn records from cancelled
4156            transactions */
4157         while (replmd_private->ncs) {
4158                 struct nc_entry *e = replmd_private->ncs;
4159                 DLIST_REMOVE(replmd_private->ncs, e);
4160                 talloc_free(e);
4161         }
4162
4163         return ldb_next_start_trans(module);
4164 }
4165
4166 /*
4167   on prepare commit we loop over our queued la_context structures and
4168   apply each of them
4169  */
4170 static int replmd_prepare_commit(struct ldb_module *module)
4171 {
4172         struct replmd_private *replmd_private =
4173                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4174         struct la_entry *la, *prev;
4175         struct la_backlink *bl;
4176         int ret;
4177
4178         /* walk the list backwards, to do the first entry first, as we
4179          * added the entries with DLIST_ADD() which puts them at the
4180          * start of the list */
4181         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
4182                 prev = DLIST_PREV(la);
4183                 DLIST_REMOVE(replmd_private->la_list, la);
4184                 ret = replmd_process_linked_attribute(module, la, NULL);
4185                 if (ret != LDB_SUCCESS) {
4186                         replmd_txn_cleanup(replmd_private);
4187                         return ret;
4188                 }
4189         }
4190
4191         /* process our backlink list, creating and deleting backlinks
4192            as necessary */
4193         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
4194                 ret = replmd_process_backlink(module, bl, NULL);
4195                 if (ret != LDB_SUCCESS) {
4196                         replmd_txn_cleanup(replmd_private);
4197                         return ret;
4198                 }
4199         }
4200
4201         replmd_txn_cleanup(replmd_private);
4202
4203         /* possibly change @REPLCHANGED */
4204         ret = replmd_notify_store(module, NULL);
4205         if (ret != LDB_SUCCESS) {
4206                 return ret;
4207         }
4208
4209         return ldb_next_prepare_commit(module);
4210 }
4211
4212 static int replmd_del_transaction(struct ldb_module *module)
4213 {
4214         struct replmd_private *replmd_private =
4215                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4216         replmd_txn_cleanup(replmd_private);
4217
4218         return ldb_next_del_trans(module);
4219 }
4220
4221
4222 static const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
4223         .name          = "repl_meta_data",
4224         .init_context      = replmd_init,
4225         .add               = replmd_add,
4226         .modify            = replmd_modify,
4227         .rename            = replmd_rename,
4228         .del               = replmd_delete,
4229         .extended          = replmd_extended,
4230         .start_transaction = replmd_start_transaction,
4231         .prepare_commit    = replmd_prepare_commit,
4232         .del_transaction   = replmd_del_transaction,
4233 };
4234
4235 int ldb_repl_meta_data_module_init(const char *version)
4236 {
4237         LDB_MODULE_CHECK_VERSION(version);
4238         return ldb_register_module(&ldb_repl_meta_data_module_ops);
4239 }