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)
 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);
 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);
 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);
 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);
 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 = 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                                        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)
 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);
 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)
 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);
 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);
 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);
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);
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, int count, struct GUID *guid, struct ldb_dn *dn)
1333 {
1334         struct parsed_dn *ret;
1335         if (dn && GUID_all_zero(guid)) {
1336                 /* when updating a link using DRS, we sometimes get a
1337                    NULL GUID. We then need to try and match by DN */
1338                 int i;
1339                 for (i=0; i<count; i++) {
1340                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1341                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1342                                 return &pdn[i];
1343                         }
1344                 }
1345                 return NULL;
1346         }
1347         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1348         return ret;
1349 }
1350
1351 /*
1352   get a series of message element values as an array of DNs and GUIDs
1353   the result is sorted by GUID
1354  */
1355 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1356                           struct ldb_message_element *el, struct parsed_dn **pdn,
1357                           const char *ldap_oid)
1358 {
1359         unsigned int i;
1360         struct ldb_context *ldb = ldb_module_get_ctx(module);
1361
1362         if (el == NULL) {
1363                 *pdn = NULL;
1364                 return LDB_SUCCESS;
1365         }
1366
1367         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1368         if (!*pdn) {
1369                 ldb_module_oom(module);
1370                 return LDB_ERR_OPERATIONS_ERROR;
1371         }
1372
1373         for (i=0; i<el->num_values; i++) {
1374                 struct ldb_val *v = &el->values[i];
1375                 NTSTATUS status;
1376                 struct ldb_dn *dn;
1377                 struct parsed_dn *p;
1378
1379                 p = &(*pdn)[i];
1380
1381                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1382                 if (p->dsdb_dn == NULL) {
1383                         return LDB_ERR_INVALID_DN_SYNTAX;
1384                 }
1385
1386                 dn = p->dsdb_dn->dn;
1387
1388                 p->guid = talloc(*pdn, struct GUID);
1389                 if (p->guid == NULL) {
1390                         ldb_module_oom(module);
1391                         return LDB_ERR_OPERATIONS_ERROR;
1392                 }
1393
1394                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1395                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1396                         /* we got a DN without a GUID - go find the GUID */
1397                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1398                         if (ret != LDB_SUCCESS) {
1399                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1400                                                        ldb_dn_get_linearized(dn));
1401                                 return ret;
1402                         }
1403                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1404                         if (ret != LDB_SUCCESS) {
1405                                 return ret;
1406                         }
1407                 } else if (!NT_STATUS_IS_OK(status)) {
1408                         return LDB_ERR_OPERATIONS_ERROR;
1409                 }
1410
1411                 /* keep a pointer to the original ldb_val */
1412                 p->v = v;
1413         }
1414
1415         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1416
1417         return LDB_SUCCESS;
1418 }
1419
1420 /*
1421   build a new extended DN, including all meta data fields
1422
1423   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1424   RMD_ADDTIME         = originating_add_time
1425   RMD_INVOCID         = originating_invocation_id
1426   RMD_CHANGETIME      = originating_change_time
1427   RMD_ORIGINATING_USN = originating_usn
1428   RMD_LOCAL_USN       = local_usn
1429   RMD_VERSION         = version
1430  */
1431 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1432                                const struct GUID *invocation_id, uint64_t seq_num,
1433                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1434 {
1435         struct ldb_dn *dn = dsdb_dn->dn;
1436         const char *tstring, *usn_string, *flags_string;
1437         struct ldb_val tval;
1438         struct ldb_val iid;
1439         struct ldb_val usnv, local_usnv;
1440         struct ldb_val vers, flagsv;
1441         NTSTATUS status;
1442         int ret;
1443         const char *dnstring;
1444         char *vstring;
1445         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1446
1447         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1448         if (!tstring) {
1449                 return LDB_ERR_OPERATIONS_ERROR;
1450         }
1451         tval = data_blob_string_const(tstring);
1452
1453         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1454         if (!usn_string) {
1455                 return LDB_ERR_OPERATIONS_ERROR;
1456         }
1457         usnv = data_blob_string_const(usn_string);
1458
1459         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1460         if (!usn_string) {
1461                 return LDB_ERR_OPERATIONS_ERROR;
1462         }
1463         local_usnv = data_blob_string_const(usn_string);
1464
1465         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1466         if (!vstring) {
1467                 return LDB_ERR_OPERATIONS_ERROR;
1468         }
1469         vers = data_blob_string_const(vstring);
1470
1471         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1472         if (!NT_STATUS_IS_OK(status)) {
1473                 return LDB_ERR_OPERATIONS_ERROR;
1474         }
1475
1476         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1477         if (!flags_string) {
1478                 return LDB_ERR_OPERATIONS_ERROR;
1479         }
1480         flagsv = data_blob_string_const(flags_string);
1481
1482         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1483         if (ret != LDB_SUCCESS) return ret;
1484         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1485         if (ret != LDB_SUCCESS) return ret;
1486         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1487         if (ret != LDB_SUCCESS) return ret;
1488         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1489         if (ret != LDB_SUCCESS) return ret;
1490         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1491         if (ret != LDB_SUCCESS) return ret;
1492         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1493         if (ret != LDB_SUCCESS) return ret;
1494         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1495         if (ret != LDB_SUCCESS) return ret;
1496
1497         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1498         if (dnstring == NULL) {
1499                 return LDB_ERR_OPERATIONS_ERROR;
1500         }
1501         *v = data_blob_string_const(dnstring);
1502
1503         return LDB_SUCCESS;
1504 }
1505
1506 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1507                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1508                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1509                                 uint32_t version, bool deleted);
1510
1511 /*
1512   check if any links need upgrading from w2k format
1513
1514   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.
1515  */
1516 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1517 {
1518         uint32_t i;
1519         for (i=0; i<count; i++) {
1520                 NTSTATUS status;
1521                 uint32_t version;
1522                 int ret;
1523
1524                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1525                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1526                         continue;
1527                 }
1528
1529                 /* it's an old one that needs upgrading */
1530                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1531                                            1, 1, 0, 0, false);
1532                 if (ret != LDB_SUCCESS) {
1533                         return ret;
1534                 }
1535         }
1536         return LDB_SUCCESS;
1537 }
1538
1539 /*
1540   update an extended DN, including all meta data fields
1541
1542   see replmd_build_la_val for value names
1543  */
1544 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1545                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1546                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1547                                 uint32_t version, bool deleted)
1548 {
1549         struct ldb_dn *dn = dsdb_dn->dn;
1550         const char *tstring, *usn_string, *flags_string;
1551         struct ldb_val tval;
1552         struct ldb_val iid;
1553         struct ldb_val usnv, local_usnv;
1554         struct ldb_val vers, flagsv;
1555         const struct ldb_val *old_addtime;
1556         uint32_t old_version;
1557         NTSTATUS status;
1558         int ret;
1559         const char *dnstring;
1560         char *vstring;
1561         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1562
1563         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1564         if (!tstring) {
1565                 return LDB_ERR_OPERATIONS_ERROR;
1566         }
1567         tval = data_blob_string_const(tstring);
1568
1569         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1570         if (!usn_string) {
1571                 return LDB_ERR_OPERATIONS_ERROR;
1572         }
1573         usnv = data_blob_string_const(usn_string);
1574
1575         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1576         if (!usn_string) {
1577                 return LDB_ERR_OPERATIONS_ERROR;
1578         }
1579         local_usnv = data_blob_string_const(usn_string);
1580
1581         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1582         if (!NT_STATUS_IS_OK(status)) {
1583                 return LDB_ERR_OPERATIONS_ERROR;
1584         }
1585
1586         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1587         if (!flags_string) {
1588                 return LDB_ERR_OPERATIONS_ERROR;
1589         }
1590         flagsv = data_blob_string_const(flags_string);
1591
1592         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1593         if (ret != LDB_SUCCESS) return ret;
1594
1595         /* get the ADDTIME from the original */
1596         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1597         if (old_addtime == NULL) {
1598                 old_addtime = &tval;
1599         }
1600         if (dsdb_dn != old_dsdb_dn) {
1601                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1602                 if (ret != LDB_SUCCESS) return ret;
1603         }
1604
1605         /* use our invocation id */
1606         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1607         if (ret != LDB_SUCCESS) return ret;
1608
1609         /* changetime is the current time */
1610         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1611         if (ret != LDB_SUCCESS) return ret;
1612
1613         /* update the USN */
1614         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1615         if (ret != LDB_SUCCESS) return ret;
1616
1617         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1618         if (ret != LDB_SUCCESS) return ret;
1619
1620         /* increase the version by 1 */
1621         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1622         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1623                 version = old_version+1;
1624         }
1625         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1626         vers = data_blob_string_const(vstring);
1627         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1628         if (ret != LDB_SUCCESS) return ret;
1629
1630         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1631         if (dnstring == NULL) {
1632                 return LDB_ERR_OPERATIONS_ERROR;
1633         }
1634         *v = data_blob_string_const(dnstring);
1635
1636         return LDB_SUCCESS;
1637 }
1638
1639 /*
1640   handle adding a linked attribute
1641  */
1642 static int replmd_modify_la_add(struct ldb_module *module,
1643                                 const struct dsdb_schema *schema,
1644                                 struct ldb_message *msg,
1645                                 struct ldb_message_element *el,
1646                                 struct ldb_message_element *old_el,
1647                                 const struct dsdb_attribute *schema_attr,
1648                                 uint64_t seq_num,
1649                                 time_t t,
1650                                 struct GUID *msg_guid)
1651 {
1652         unsigned int i;
1653         struct parsed_dn *dns, *old_dns;
1654         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1655         int ret;
1656         struct ldb_val *new_values = NULL;
1657         unsigned int num_new_values = 0;
1658         unsigned old_num_values = old_el?old_el->num_values:0;
1659         const struct GUID *invocation_id;
1660         struct ldb_context *ldb = ldb_module_get_ctx(module);
1661         NTTIME now;
1662
1663         unix_to_nt_time(&now, t);
1664
1665         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1666         if (ret != LDB_SUCCESS) {
1667                 talloc_free(tmp_ctx);
1668                 return ret;
1669         }
1670
1671         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1672         if (ret != LDB_SUCCESS) {
1673                 talloc_free(tmp_ctx);
1674                 return ret;
1675         }
1676
1677         invocation_id = samdb_ntds_invocation_id(ldb);
1678         if (!invocation_id) {
1679                 talloc_free(tmp_ctx);
1680                 return LDB_ERR_OPERATIONS_ERROR;
1681         }
1682
1683         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1684         if (ret != LDB_SUCCESS) {
1685                 talloc_free(tmp_ctx);
1686                 return ret;
1687         }
1688
1689         /* for each new value, see if it exists already with the same GUID */
1690         for (i=0; i<el->num_values; i++) {
1691                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1692                 if (p == NULL) {
1693                         /* this is a new linked attribute value */
1694                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1695                         if (new_values == NULL) {
1696                                 ldb_module_oom(module);
1697                                 talloc_free(tmp_ctx);
1698                                 return LDB_ERR_OPERATIONS_ERROR;
1699                         }
1700                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1701                                                   invocation_id, seq_num, seq_num, now, 0, false);
1702                         if (ret != LDB_SUCCESS) {
1703                                 talloc_free(tmp_ctx);
1704                                 return ret;
1705                         }
1706                         num_new_values++;
1707                 } else {
1708                         /* this is only allowed if the GUID was
1709                            previously deleted. */
1710                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1711
1712                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1713                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1714                                                        el->name, GUID_string(tmp_ctx, p->guid));
1715                                 talloc_free(tmp_ctx);
1716                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1717                         }
1718                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1719                                                    invocation_id, seq_num, seq_num, now, 0, false);
1720                         if (ret != LDB_SUCCESS) {
1721                                 talloc_free(tmp_ctx);
1722                                 return ret;
1723                         }
1724                 }
1725
1726                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1727                 if (ret != LDB_SUCCESS) {
1728                         talloc_free(tmp_ctx);
1729                         return ret;
1730                 }
1731         }
1732
1733         /* add the new ones on to the end of the old values, constructing a new el->values */
1734         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1735                                     struct ldb_val,
1736                                     old_num_values+num_new_values);
1737         if (el->values == NULL) {
1738                 ldb_module_oom(module);
1739                 return LDB_ERR_OPERATIONS_ERROR;
1740         }
1741
1742         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1743         el->num_values = old_num_values + num_new_values;
1744
1745         talloc_steal(msg->elements, el->values);
1746         talloc_steal(el->values, new_values);
1747
1748         talloc_free(tmp_ctx);
1749
1750         /* we now tell the backend to replace all existing values
1751            with the one we have constructed */
1752         el->flags = LDB_FLAG_MOD_REPLACE;
1753
1754         return LDB_SUCCESS;
1755 }
1756
1757
1758 /*
1759   handle deleting all active linked attributes
1760  */
1761 static int replmd_modify_la_delete(struct ldb_module *module,
1762                                    const struct dsdb_schema *schema,
1763                                    struct ldb_message *msg,
1764                                    struct ldb_message_element *el,
1765                                    struct ldb_message_element *old_el,
1766                                    const struct dsdb_attribute *schema_attr,
1767                                    uint64_t seq_num,
1768                                    time_t t,
1769                                    struct GUID *msg_guid)
1770 {
1771         unsigned int i;
1772         struct parsed_dn *dns, *old_dns;
1773         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1774         int ret;
1775         const struct GUID *invocation_id;
1776         struct ldb_context *ldb = ldb_module_get_ctx(module);
1777         NTTIME now;
1778
1779         unix_to_nt_time(&now, t);
1780
1781         /* check if there is nothing to delete */
1782         if ((!old_el || old_el->num_values == 0) &&
1783             el->num_values == 0) {
1784                 return LDB_SUCCESS;
1785         }
1786
1787         if (!old_el || old_el->num_values == 0) {
1788                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1789         }
1790
1791         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1792         if (ret != LDB_SUCCESS) {
1793                 talloc_free(tmp_ctx);
1794                 return ret;
1795         }
1796
1797         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1798         if (ret != LDB_SUCCESS) {
1799                 talloc_free(tmp_ctx);
1800                 return ret;
1801         }
1802
1803         invocation_id = samdb_ntds_invocation_id(ldb);
1804         if (!invocation_id) {
1805                 return LDB_ERR_OPERATIONS_ERROR;
1806         }
1807
1808         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
1809         if (ret != LDB_SUCCESS) {
1810                 talloc_free(tmp_ctx);
1811                 return ret;
1812         }
1813
1814         el->values = NULL;
1815
1816         /* see if we are being asked to delete any links that
1817            don't exist or are already deleted */
1818         for (i=0; i<el->num_values; i++) {
1819                 struct parsed_dn *p = &dns[i];
1820                 struct parsed_dn *p2;
1821                 uint32_t rmd_flags;
1822
1823                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1824                 if (!p2) {
1825                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1826                                                el->name, GUID_string(tmp_ctx, p->guid));
1827                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1828                 }
1829                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1830                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1831                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1832                                                el->name, GUID_string(tmp_ctx, p->guid));
1833                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1834                 }
1835         }
1836
1837         /* for each new value, see if it exists already with the same GUID
1838            if it is not already deleted and matches the delete list then delete it
1839         */
1840         for (i=0; i<old_el->num_values; i++) {
1841                 struct parsed_dn *p = &old_dns[i];
1842                 uint32_t rmd_flags;
1843
1844                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1845                         continue;
1846                 }
1847
1848                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1849                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1850
1851                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1852                                            invocation_id, seq_num, seq_num, now, 0, true);
1853                 if (ret != LDB_SUCCESS) {
1854                         talloc_free(tmp_ctx);
1855                         return ret;
1856                 }
1857
1858                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1859                 if (ret != LDB_SUCCESS) {
1860                         talloc_free(tmp_ctx);
1861                         return ret;
1862                 }
1863         }
1864
1865         el->values = talloc_steal(msg->elements, old_el->values);
1866         el->num_values = old_el->num_values;
1867
1868         talloc_free(tmp_ctx);
1869
1870         /* we now tell the backend to replace all existing values
1871            with the one we have constructed */
1872         el->flags = LDB_FLAG_MOD_REPLACE;
1873
1874         return LDB_SUCCESS;
1875 }
1876
1877 /*
1878   handle replacing a linked attribute
1879  */
1880 static int replmd_modify_la_replace(struct ldb_module *module,
1881                                     const struct dsdb_schema *schema,
1882                                     struct ldb_message *msg,
1883                                     struct ldb_message_element *el,
1884                                     struct ldb_message_element *old_el,
1885                                     const struct dsdb_attribute *schema_attr,
1886                                     uint64_t seq_num,
1887                                     time_t t,
1888                                     struct GUID *msg_guid)
1889 {
1890         unsigned int i;
1891         struct parsed_dn *dns, *old_dns;
1892         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1893         int ret;
1894         const struct GUID *invocation_id;
1895         struct ldb_context *ldb = ldb_module_get_ctx(module);
1896         struct ldb_val *new_values = NULL;
1897         unsigned int num_new_values = 0;
1898         unsigned int old_num_values = old_el?old_el->num_values:0;
1899         NTTIME now;
1900
1901         unix_to_nt_time(&now, t);
1902
1903         /* check if there is nothing to replace */
1904         if ((!old_el || old_el->num_values == 0) &&
1905             el->num_values == 0) {
1906                 return LDB_SUCCESS;
1907         }
1908
1909         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1910         if (ret != LDB_SUCCESS) {
1911                 talloc_free(tmp_ctx);
1912                 return ret;
1913         }
1914
1915         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1916         if (ret != LDB_SUCCESS) {
1917                 talloc_free(tmp_ctx);
1918                 return ret;
1919         }
1920
1921         invocation_id = samdb_ntds_invocation_id(ldb);
1922         if (!invocation_id) {
1923                 return LDB_ERR_OPERATIONS_ERROR;
1924         }
1925
1926         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1927         if (ret != LDB_SUCCESS) {
1928                 talloc_free(tmp_ctx);
1929                 return ret;
1930         }
1931
1932         /* mark all the old ones as deleted */
1933         for (i=0; i<old_num_values; i++) {
1934                 struct parsed_dn *old_p = &old_dns[i];
1935                 struct parsed_dn *p;
1936                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1937
1938                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1939
1940                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1941                 if (ret != LDB_SUCCESS) {
1942                         talloc_free(tmp_ctx);
1943                         return ret;
1944                 }
1945
1946                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1947                 if (p) {
1948                         /* we don't delete it if we are re-adding it */
1949                         continue;
1950                 }
1951
1952                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1953                                            invocation_id, seq_num, seq_num, now, 0, true);
1954                 if (ret != LDB_SUCCESS) {
1955                         talloc_free(tmp_ctx);
1956                         return ret;
1957                 }
1958         }
1959
1960         /* for each new value, either update its meta-data, or add it
1961          * to old_el
1962         */
1963         for (i=0; i<el->num_values; i++) {
1964                 struct parsed_dn *p = &dns[i], *old_p;
1965
1966                 if (old_dns &&
1967                     (old_p = parsed_dn_find(old_dns,
1968                                             old_num_values, p->guid, NULL)) != NULL) {
1969                         /* update in place */
1970                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1971                                                    old_p->dsdb_dn, invocation_id,
1972                                                    seq_num, seq_num, now, 0, false);
1973                         if (ret != LDB_SUCCESS) {
1974                                 talloc_free(tmp_ctx);
1975                                 return ret;
1976                         }
1977                 } else {
1978                         /* add a new one */
1979                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1980                                                     num_new_values+1);
1981                         if (new_values == NULL) {
1982                                 ldb_module_oom(module);
1983                                 talloc_free(tmp_ctx);
1984                                 return LDB_ERR_OPERATIONS_ERROR;
1985                         }
1986                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1987                                                   invocation_id, seq_num, seq_num, now, 0, false);
1988                         if (ret != LDB_SUCCESS) {
1989                                 talloc_free(tmp_ctx);
1990                                 return ret;
1991                         }
1992                         num_new_values++;
1993                 }
1994
1995                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1996                 if (ret != LDB_SUCCESS) {
1997                         talloc_free(tmp_ctx);
1998                         return ret;
1999                 }
2000         }
2001
2002         /* add the new values to the end of old_el */
2003         if (num_new_values != 0) {
2004                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
2005                                             struct ldb_val, old_num_values+num_new_values);
2006                 if (el->values == NULL) {
2007                         ldb_module_oom(module);
2008                         return LDB_ERR_OPERATIONS_ERROR;
2009                 }
2010                 memcpy(&el->values[old_num_values], &new_values[0],
2011                        sizeof(struct ldb_val)*num_new_values);
2012                 el->num_values = old_num_values + num_new_values;
2013                 talloc_steal(msg->elements, new_values);
2014         } else {
2015                 el->values = old_el->values;
2016                 el->num_values = old_el->num_values;
2017                 talloc_steal(msg->elements, el->values);
2018         }
2019
2020         talloc_free(tmp_ctx);
2021
2022         /* we now tell the backend to replace all existing values
2023            with the one we have constructed */
2024         el->flags = LDB_FLAG_MOD_REPLACE;
2025
2026         return LDB_SUCCESS;
2027 }
2028
2029
2030 /*
2031   handle linked attributes in modify requests
2032  */
2033 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
2034                                                struct ldb_message *msg,
2035                                                uint64_t seq_num, time_t t)
2036 {
2037         struct ldb_result *res;
2038         unsigned int i;
2039         int ret;
2040         struct ldb_context *ldb = ldb_module_get_ctx(module);
2041         struct ldb_message *old_msg;
2042
2043         const struct dsdb_schema *schema;
2044         struct GUID old_guid;
2045
2046         if (seq_num == 0) {
2047                 /* there the replmd_update_rpmd code has already
2048                  * checked and saw that there are no linked
2049                  * attributes */
2050                 return LDB_SUCCESS;
2051         }
2052
2053         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
2054                 /* don't do anything special for linked attributes */
2055                 return LDB_SUCCESS;
2056         }
2057
2058         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
2059                                     DSDB_FLAG_NEXT_MODULE |
2060                                     DSDB_SEARCH_SHOW_RECYCLED |
2061                                     DSDB_SEARCH_REVEAL_INTERNALS |
2062                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2063         if (ret != LDB_SUCCESS) {
2064                 return ret;
2065         }
2066         schema = dsdb_get_schema(ldb, res);
2067         if (!schema) {
2068                 return LDB_ERR_OPERATIONS_ERROR;
2069         }
2070
2071         old_msg = res->msgs[0];
2072
2073         old_guid = samdb_result_guid(old_msg, "objectGUID");
2074
2075         for (i=0; i<msg->num_elements; i++) {
2076                 struct ldb_message_element *el = &msg->elements[i];
2077                 struct ldb_message_element *old_el, *new_el;
2078                 const struct dsdb_attribute *schema_attr
2079                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2080                 if (!schema_attr) {
2081                         ldb_asprintf_errstring(ldb,
2082                                                "attribute %s is not a valid attribute in schema", el->name);
2083                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
2084                 }
2085                 if (schema_attr->linkID == 0) {
2086                         continue;
2087                 }
2088                 if ((schema_attr->linkID & 1) == 1) {
2089                         /* Odd is for the target.  Illegal to modify */
2090                         ldb_asprintf_errstring(ldb,
2091                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
2092                         return LDB_ERR_UNWILLING_TO_PERFORM;
2093                 }
2094                 old_el = ldb_msg_find_element(old_msg, el->name);
2095                 switch (el->flags & LDB_FLAG_MOD_MASK) {
2096                 case LDB_FLAG_MOD_REPLACE:
2097                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2098                         break;
2099                 case LDB_FLAG_MOD_DELETE:
2100                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2101                         break;
2102                 case LDB_FLAG_MOD_ADD:
2103                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2104                         break;
2105                 default:
2106                         ldb_asprintf_errstring(ldb,
2107                                                "invalid flags 0x%x for %s linked attribute",
2108                                                el->flags, el->name);
2109                         return LDB_ERR_UNWILLING_TO_PERFORM;
2110                 }
2111                 if (ret != LDB_SUCCESS) {
2112                         return ret;
2113                 }
2114                 if (old_el) {
2115                         ldb_msg_remove_attr(old_msg, el->name);
2116                 }
2117                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2118                 new_el->num_values = el->num_values;
2119                 new_el->values = talloc_steal(msg->elements, el->values);
2120
2121                 /* TODO: this relises a bit too heavily on the exact
2122                    behaviour of ldb_msg_find_element and
2123                    ldb_msg_remove_element */
2124                 old_el = ldb_msg_find_element(msg, el->name);
2125                 if (old_el != el) {
2126                         ldb_msg_remove_element(msg, old_el);
2127                         i--;
2128                 }
2129         }
2130
2131         talloc_free(res);
2132         return ret;
2133 }
2134
2135
2136
2137 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2138 {
2139         struct ldb_context *ldb;
2140         struct replmd_replicated_request *ac;
2141         struct ldb_request *down_req;
2142         struct ldb_message *msg;
2143         time_t t = time(NULL);
2144         int ret;
2145         bool is_urgent = false;
2146         struct loadparm_context *lp_ctx;
2147         char *referral;
2148         unsigned int functional_level;
2149         const DATA_BLOB *guid_blob;
2150
2151         /* do not manipulate our control entries */
2152         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2153                 return ldb_next_request(module, req);
2154         }
2155
2156         ldb = ldb_module_get_ctx(module);
2157
2158         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2159
2160         guid_blob = ldb_msg_find_ldb_val(req->op.mod.message, "objectGUID");
2161         if ( guid_blob != NULL ) {
2162                 ldb_set_errstring(ldb,
2163                                   "replmd_modify: it's not allowed to change the objectGUID!");
2164                 return LDB_ERR_CONSTRAINT_VIOLATION;
2165         }
2166
2167         ac = replmd_ctx_init(module, req);
2168         if (ac == NULL) {
2169                 return ldb_module_oom(module);
2170         }
2171
2172         functional_level = dsdb_functional_level(ldb);
2173
2174         lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2175                                  struct loadparm_context);
2176
2177         /* we have to copy the message as the caller might have it as a const */
2178         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2179         if (msg == NULL) {
2180                 ldb_oom(ldb);
2181                 talloc_free(ac);
2182                 return LDB_ERR_OPERATIONS_ERROR;
2183         }
2184
2185         ldb_msg_remove_attr(msg, "whenChanged");
2186         ldb_msg_remove_attr(msg, "uSNChanged");
2187
2188         ret = replmd_update_rpmd(module, ac->schema, req, msg, &ac->seq_num, t, &is_urgent);
2189         if (ret == LDB_ERR_REFERRAL) {
2190                 referral = talloc_asprintf(req,
2191                                            "ldap://%s/%s",
2192                                            lpcfg_dnsdomain(lp_ctx),
2193                                            ldb_dn_get_linearized(msg->dn));
2194                 ret = ldb_module_send_referral(req, referral);
2195                 talloc_free(ac);
2196                 return ldb_module_done(req, NULL, NULL, ret);
2197         }
2198
2199         if (ret != LDB_SUCCESS) {
2200                 talloc_free(ac);
2201                 return ret;
2202         }
2203
2204         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
2205         if (ret != LDB_SUCCESS) {
2206                 talloc_free(ac);
2207                 return ret;
2208         }
2209
2210         /* TODO:
2211          * - replace the old object with the newly constructed one
2212          */
2213
2214         ac->is_urgent = is_urgent;
2215
2216         ret = ldb_build_mod_req(&down_req, ldb, ac,
2217                                 msg,
2218                                 req->controls,
2219                                 ac, replmd_op_callback,
2220                                 req);
2221         LDB_REQ_SET_LOCATION(down_req);
2222         if (ret != LDB_SUCCESS) {
2223                 talloc_free(ac);
2224                 return ret;
2225         }
2226
2227         /* If we are in functional level 2000, then
2228          * replmd_modify_handle_linked_attribs will have done
2229          * nothing */
2230         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
2231                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
2232                 if (ret != LDB_SUCCESS) {
2233                         talloc_free(ac);
2234                         return ret;
2235                 }
2236         }
2237
2238         talloc_steal(down_req, msg);
2239
2240         /* we only change whenChanged and uSNChanged if the seq_num
2241            has changed */
2242         if (ac->seq_num != 0) {
2243                 ret = add_time_element(msg, "whenChanged", t);
2244                 if (ret != LDB_SUCCESS) {
2245                         talloc_free(ac);
2246                         return ret;
2247                 }
2248
2249                 ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
2250                 if (ret != LDB_SUCCESS) {
2251                         talloc_free(ac);
2252                         return ret;
2253                 }
2254         }
2255
2256         /* go on with the call chain */
2257         return ldb_next_request(module, down_req);
2258 }
2259
2260 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2261
2262 /*
2263   handle a rename request
2264
2265   On a rename we need to do an extra ldb_modify which sets the
2266   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2267  */
2268 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2269 {
2270         struct ldb_context *ldb;
2271         struct replmd_replicated_request *ac;
2272         int ret;
2273         struct ldb_request *down_req;
2274
2275         /* do not manipulate our control entries */
2276         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2277                 return ldb_next_request(module, req);
2278         }
2279
2280         ldb = ldb_module_get_ctx(module);
2281
2282         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2283
2284         ac = replmd_ctx_init(module, req);
2285         if (ac == NULL) {
2286                 return ldb_module_oom(module);
2287         }
2288
2289         ret = ldb_build_rename_req(&down_req, ldb, ac,
2290                                    ac->req->op.rename.olddn,
2291                                    ac->req->op.rename.newdn,
2292                                    ac->req->controls,
2293                                    ac, replmd_rename_callback,
2294                                    ac->req);
2295         LDB_REQ_SET_LOCATION(down_req);
2296         if (ret != LDB_SUCCESS) {
2297                 talloc_free(ac);
2298                 return ret;
2299         }
2300
2301         /* go on with the call chain */
2302         return ldb_next_request(module, down_req);
2303 }
2304
2305 /* After the rename is compleated, update the whenchanged etc */
2306 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2307 {
2308         struct ldb_context *ldb;
2309         struct replmd_replicated_request *ac;
2310         struct ldb_request *down_req;
2311         struct ldb_message *msg;
2312         time_t t = time(NULL);
2313         int ret;
2314
2315         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2316         ldb = ldb_module_get_ctx(ac->module);
2317
2318         if (ares->error != LDB_SUCCESS) {
2319                 return ldb_module_done(ac->req, ares->controls,
2320                                         ares->response, ares->error);
2321         }
2322
2323         if (ares->type != LDB_REPLY_DONE) {
2324                 ldb_set_errstring(ldb,
2325                                   "invalid ldb_reply_type in callback");
2326                 talloc_free(ares);
2327                 return ldb_module_done(ac->req, NULL, NULL,
2328                                         LDB_ERR_OPERATIONS_ERROR);
2329         }
2330
2331         /* Get a sequence number from the backend */
2332         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2333         if (ret != LDB_SUCCESS) {
2334                 return ret;
2335         }
2336
2337         /* TODO:
2338          * - replace the old object with the newly constructed one
2339          */
2340
2341         msg = ldb_msg_new(ac);
2342         if (msg == NULL) {
2343                 ldb_oom(ldb);
2344                 return LDB_ERR_OPERATIONS_ERROR;
2345         }
2346
2347         msg->dn = ac->req->op.rename.newdn;
2348
2349         ret = ldb_build_mod_req(&down_req, ldb, ac,
2350                                 msg,
2351                                 req->controls,
2352                                 ac, replmd_op_callback,
2353                                 req);
2354         LDB_REQ_SET_LOCATION(down_req);
2355         if (ret != LDB_SUCCESS) {
2356                 talloc_free(ac);
2357                 return ret;
2358         }
2359         talloc_steal(down_req, msg);
2360
2361         ret = add_time_element(msg, "whenChanged", t);
2362         if (ret != LDB_SUCCESS) {
2363                 talloc_free(ac);
2364                 return ret;
2365         }
2366
2367         ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
2368         if (ret != LDB_SUCCESS) {
2369                 talloc_free(ac);
2370                 return ret;
2371         }
2372
2373         /* go on with the call chain - do the modify after the rename */
2374         return ldb_next_request(ac->module, down_req);
2375 }
2376
2377 /*
2378    remove links from objects that point at this object when an object
2379    is deleted
2380  */
2381 static int replmd_delete_remove_link(struct ldb_module *module,
2382                                      const struct dsdb_schema *schema,
2383                                      struct ldb_dn *dn,
2384                                      struct ldb_message_element *el,
2385                                      const struct dsdb_attribute *sa)
2386 {
2387         unsigned int i;
2388         TALLOC_CTX *tmp_ctx = talloc_new(module);
2389         struct ldb_context *ldb = ldb_module_get_ctx(module);
2390
2391         for (i=0; i<el->num_values; i++) {
2392                 struct dsdb_dn *dsdb_dn;
2393                 NTSTATUS status;
2394                 int ret;
2395                 struct GUID guid2;
2396                 struct ldb_message *msg;
2397                 const struct dsdb_attribute *target_attr;
2398                 struct ldb_message_element *el2;
2399                 struct ldb_val dn_val;
2400
2401                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2402                         continue;
2403                 }
2404
2405                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2406                 if (!dsdb_dn) {
2407                         talloc_free(tmp_ctx);
2408                         return LDB_ERR_OPERATIONS_ERROR;
2409                 }
2410
2411                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2412                 if (!NT_STATUS_IS_OK(status)) {
2413                         talloc_free(tmp_ctx);
2414                         return LDB_ERR_OPERATIONS_ERROR;
2415                 }
2416
2417                 /* remove the link */
2418                 msg = ldb_msg_new(tmp_ctx);
2419                 if (!msg) {
2420                         ldb_module_oom(module);
2421                         talloc_free(tmp_ctx);
2422                         return LDB_ERR_OPERATIONS_ERROR;
2423                 }
2424
2425
2426                 msg->dn = dsdb_dn->dn;
2427
2428                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2429                 if (target_attr == NULL) {
2430                         continue;
2431                 }
2432
2433                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2434                 if (ret != LDB_SUCCESS) {
2435                         ldb_module_oom(module);
2436                         talloc_free(tmp_ctx);
2437                         return LDB_ERR_OPERATIONS_ERROR;
2438                 }
2439                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2440                 el2->values = &dn_val;
2441                 el2->num_values = 1;
2442
2443                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2444                 if (ret != LDB_SUCCESS) {
2445                         talloc_free(tmp_ctx);
2446                         return ret;
2447                 }
2448         }
2449         talloc_free(tmp_ctx);
2450         return LDB_SUCCESS;
2451 }
2452
2453
2454 /*
2455   handle update of replication meta data for deletion of objects
2456
2457   This also handles the mapping of delete to a rename operation
2458   to allow deletes to be replicated.
2459  */
2460 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2461 {
2462         int ret = LDB_ERR_OTHER;
2463         bool retb, disallow_move_on_delete;
2464         struct ldb_dn *old_dn, *new_dn;
2465         const char *rdn_name;
2466         const struct ldb_val *rdn_value, *new_rdn_value;
2467         struct GUID guid;
2468         struct ldb_context *ldb = ldb_module_get_ctx(module);
2469         const struct dsdb_schema *schema;
2470         struct ldb_message *msg, *old_msg;
2471         struct ldb_message_element *el;
2472         TALLOC_CTX *tmp_ctx;
2473         struct ldb_result *res, *parent_res;
2474         const char *preserved_attrs[] = {
2475                 /* yes, this really is a hard coded list. See MS-ADTS
2476                    section 3.1.1.5.5.1.1 */
2477                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2478                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2479                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2480                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2481                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2482                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2483                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2484                 "whenChanged", NULL};
2485         unsigned int i, el_count = 0;
2486         enum deletion_state { OBJECT_NOT_DELETED=1, OBJECT_DELETED=2, OBJECT_RECYCLED=3,
2487                                                 OBJECT_TOMBSTONE=4, OBJECT_REMOVED=5 };
2488         enum deletion_state deletion_state, next_deletion_state;
2489         bool enabled;
2490
2491         if (ldb_dn_is_special(req->op.del.dn)) {
2492                 return ldb_next_request(module, req);
2493         }
2494
2495         tmp_ctx = talloc_new(ldb);
2496         if (!tmp_ctx) {
2497                 ldb_oom(ldb);
2498                 return LDB_ERR_OPERATIONS_ERROR;
2499         }
2500
2501         schema = dsdb_get_schema(ldb, tmp_ctx);
2502         if (!schema) {
2503                 return LDB_ERR_OPERATIONS_ERROR;
2504         }
2505
2506         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2507
2508         /* we need the complete msg off disk, so we can work out which
2509            attributes need to be removed */
2510         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2511                                     DSDB_FLAG_NEXT_MODULE |
2512                                     DSDB_SEARCH_SHOW_RECYCLED |
2513                                     DSDB_SEARCH_REVEAL_INTERNALS |
2514                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2515         if (ret != LDB_SUCCESS) {
2516                 talloc_free(tmp_ctx);
2517                 return ret;
2518         }
2519         old_msg = res->msgs[0];
2520
2521
2522         ret = dsdb_recyclebin_enabled(module, &enabled);
2523         if (ret != LDB_SUCCESS) {
2524                 talloc_free(tmp_ctx);
2525                 return ret;
2526         }
2527
2528         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2529                 if (!enabled) {
2530                         deletion_state = OBJECT_TOMBSTONE;
2531                         next_deletion_state = OBJECT_REMOVED;
2532                 } else if (ldb_msg_check_string_attribute(old_msg, "isRecycled", "TRUE")) {
2533                         deletion_state = OBJECT_RECYCLED;
2534                         next_deletion_state = OBJECT_REMOVED;
2535                 } else {
2536                         deletion_state = OBJECT_DELETED;
2537                         next_deletion_state = OBJECT_RECYCLED;
2538                 }
2539         } else {
2540                 deletion_state = OBJECT_NOT_DELETED;
2541                 if (enabled) {
2542                         next_deletion_state = OBJECT_DELETED;
2543                 } else {
2544                         next_deletion_state = OBJECT_TOMBSTONE;
2545                 }
2546         }
2547
2548         if (next_deletion_state == OBJECT_REMOVED) {
2549                 struct auth_session_info *session_info =
2550                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2551                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2552                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2553                                         ldb_dn_get_linearized(old_msg->dn));
2554                         return LDB_ERR_UNWILLING_TO_PERFORM;
2555                 }
2556
2557                 /* it is already deleted - really remove it this time */
2558                 talloc_free(tmp_ctx);
2559                 return ldb_next_request(module, req);
2560         }
2561
2562         rdn_name = ldb_dn_get_rdn_name(old_dn);
2563         rdn_value = ldb_dn_get_rdn_val(old_dn);
2564         if ((rdn_name == NULL) || (rdn_value == NULL)) {
2565                 talloc_free(tmp_ctx);
2566                 return ldb_operr(ldb);
2567         }
2568
2569         msg = ldb_msg_new(tmp_ctx);
2570         if (msg == NULL) {
2571                 ldb_module_oom(module);
2572                 talloc_free(tmp_ctx);
2573                 return LDB_ERR_OPERATIONS_ERROR;
2574         }
2575
2576         msg->dn = old_dn;
2577
2578         if (deletion_state == OBJECT_NOT_DELETED){
2579                 /* consider the SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE flag */
2580                 disallow_move_on_delete =
2581                         (ldb_msg_find_attr_as_int(old_msg, "systemFlags", 0)
2582                                 & SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE);
2583
2584                 /* work out where we will be renaming this object to */
2585                 if (!disallow_move_on_delete) {
2586                         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn,
2587                                                           &new_dn);
2588                         if (ret != LDB_SUCCESS) {
2589                                 /* this is probably an attempted delete on a partition
2590                                  * that doesn't allow delete operations, such as the
2591                                  * schema partition */
2592                                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2593                                                            ldb_dn_get_linearized(old_dn));
2594                                 talloc_free(tmp_ctx);
2595                                 return LDB_ERR_UNWILLING_TO_PERFORM;
2596                         }
2597                 } else {
2598                         new_dn = ldb_dn_get_parent(tmp_ctx, old_dn);
2599                         if (new_dn == NULL) {
2600                                 ldb_module_oom(module);
2601                                 talloc_free(tmp_ctx);
2602                                 return LDB_ERR_OPERATIONS_ERROR;
2603                         }
2604                 }
2605
2606                 /* get the objects GUID from the search we just did */
2607                 guid = samdb_result_guid(old_msg, "objectGUID");
2608
2609                 /* Add a formatted child */
2610                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2611                                                 rdn_name,
2612                                                 ldb_dn_escape_value(tmp_ctx, *rdn_value),
2613                                                 GUID_string(tmp_ctx, &guid));
2614                 if (!retb) {
2615                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2616                                         ldb_dn_get_linearized(new_dn)));
2617                         talloc_free(tmp_ctx);
2618                         return LDB_ERR_OPERATIONS_ERROR;
2619                 }
2620
2621                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2622                 if (ret != LDB_SUCCESS) {
2623                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2624                         ldb_module_oom(module);
2625                         talloc_free(tmp_ctx);
2626                         return ret;
2627                 }
2628                 msg->elements[el_count++].flags = LDB_FLAG_MOD_REPLACE;
2629         }
2630
2631         /*
2632           now we need to modify the object in the following ways:
2633
2634           - add isDeleted=TRUE
2635           - update rDN and name, with new rDN
2636           - remove linked attributes
2637           - remove objectCategory and sAMAccountType
2638           - remove attribs not on the preserved list
2639              - preserved if in above list, or is rDN
2640           - remove all linked attribs from this object
2641           - remove all links from other objects to this object
2642           - add lastKnownParent
2643           - update replPropertyMetaData?
2644
2645           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2646          */
2647
2648         /* we need the storage form of the parent GUID */
2649         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2650                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2651                                     DSDB_FLAG_NEXT_MODULE |
2652                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2653                                     DSDB_SEARCH_REVEAL_INTERNALS|
2654                                     DSDB_SEARCH_SHOW_RECYCLED);
2655         if (ret != LDB_SUCCESS) {
2656                 talloc_free(tmp_ctx);
2657                 return ret;
2658         }
2659
2660         if (deletion_state == OBJECT_NOT_DELETED){
2661                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2662                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2663                 if (ret != LDB_SUCCESS) {
2664                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2665                         ldb_module_oom(module);
2666                         talloc_free(tmp_ctx);
2667                         return ret;
2668                 }
2669                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2670         }
2671
2672         switch (next_deletion_state){
2673
2674         case OBJECT_DELETED:
2675
2676                 ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
2677                 if (ret != LDB_SUCCESS) {
2678                         DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
2679                         ldb_module_oom(module);
2680                         talloc_free(tmp_ctx);
2681                         return ret;
2682                 }
2683                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2684
2685                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_DELETE, NULL);
2686                 if (ret != LDB_SUCCESS) {
2687                         talloc_free(tmp_ctx);
2688                         ldb_module_oom(module);
2689                         return ret;
2690                 }
2691
2692                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_DELETE, NULL);
2693                 if (ret != LDB_SUCCESS) {
2694                         talloc_free(tmp_ctx);
2695                         ldb_module_oom(module);
2696                         return ret;
2697                 }
2698
2699                 break;
2700
2701         case OBJECT_RECYCLED:
2702         case OBJECT_TOMBSTONE:
2703
2704                 /* we also mark it as recycled, meaning this object can't be
2705                    recovered (we are stripping its attributes) */
2706                 if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2707                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2708                         if (ret != LDB_SUCCESS) {
2709                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2710                                 ldb_module_oom(module);
2711                                 talloc_free(tmp_ctx);
2712                                 return ret;
2713                         }
2714                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2715                 }
2716
2717                 /* work out which of the old attributes we will be removing */
2718                 for (i=0; i<old_msg->num_elements; i++) {
2719                         const struct dsdb_attribute *sa;
2720                         el = &old_msg->elements[i];
2721                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2722                         if (!sa) {
2723                                 talloc_free(tmp_ctx);
2724                                 return LDB_ERR_OPERATIONS_ERROR;
2725                         }
2726                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2727                                 /* don't remove the rDN */
2728                                 continue;
2729                         }
2730                         if (sa->linkID && sa->linkID & 1) {
2731                                 ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2732                                 if (ret != LDB_SUCCESS) {
2733                                         talloc_free(tmp_ctx);
2734                                         return LDB_ERR_OPERATIONS_ERROR;
2735                                 }
2736                                 continue;
2737                         }
2738                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2739                                 continue;
2740                         }
2741                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2742                         if (ret != LDB_SUCCESS) {
2743                                 talloc_free(tmp_ctx);
2744                                 ldb_module_oom(module);
2745                                 return ret;
2746                         }
2747                 }
2748                 break;
2749
2750         default:
2751                 break;
2752         }
2753
2754         if (deletion_state == OBJECT_NOT_DELETED) {
2755                 const struct dsdb_attribute *sa;
2756
2757                 /* work out what the new rdn value is, for updating the
2758                    rDN and name fields */
2759                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2760                 if (new_rdn_value == NULL) {
2761                         talloc_free(tmp_ctx);
2762                         return ldb_operr(ldb);
2763                 }
2764
2765                 sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
2766                 if (!sa) {
2767                         talloc_free(tmp_ctx);
2768                         return LDB_ERR_OPERATIONS_ERROR;
2769                 }
2770
2771                 ret = ldb_msg_add_value(msg, sa->lDAPDisplayName, new_rdn_value,
2772                                         &el);
2773                 if (ret != LDB_SUCCESS) {
2774                         talloc_free(tmp_ctx);
2775                         return ret;
2776                 }
2777                 el->flags = LDB_FLAG_MOD_REPLACE;
2778
2779                 el = ldb_msg_find_element(old_msg, "name");
2780                 if (el) {
2781                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2782                         if (ret != LDB_SUCCESS) {
2783                                 talloc_free(tmp_ctx);
2784                                 return ret;
2785                         }
2786                         el->flags = LDB_FLAG_MOD_REPLACE;
2787                 }
2788         }
2789
2790         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2791         if (ret != LDB_SUCCESS) {
2792                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2793                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2794                 talloc_free(tmp_ctx);
2795                 return ret;
2796         }
2797
2798         if (deletion_state == OBJECT_NOT_DELETED) {
2799                 /* now rename onto the new DN */
2800                 ret = dsdb_module_rename(module, old_dn, new_dn, DSDB_FLAG_NEXT_MODULE);
2801                 if (ret != LDB_SUCCESS){
2802                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2803                                  ldb_dn_get_linearized(old_dn),
2804                                  ldb_dn_get_linearized(new_dn),
2805                                  ldb_errstring(ldb)));
2806                         talloc_free(tmp_ctx);
2807                         return ret;
2808                 }
2809         }
2810
2811         talloc_free(tmp_ctx);
2812
2813         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2814 }
2815
2816
2817
2818 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2819 {
2820         return ret;
2821 }
2822
2823 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2824 {
2825         int ret = LDB_ERR_OTHER;
2826         /* TODO: do some error mapping */
2827         return ret;
2828 }
2829
2830 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2831 {
2832         struct ldb_context *ldb;
2833         struct ldb_request *change_req;
2834         enum ndr_err_code ndr_err;
2835         struct ldb_message *msg;
2836         struct replPropertyMetaDataBlob *md;
2837         struct ldb_val md_value;
2838         unsigned int i;
2839         int ret;
2840
2841         /*
2842          * TODO: check if the parent object exist
2843          */
2844
2845         /*
2846          * TODO: handle the conflict case where an object with the
2847          *       same name exist
2848          */
2849
2850         ldb = ldb_module_get_ctx(ar->module);
2851         msg = ar->objs->objects[ar->index_current].msg;
2852         md = ar->objs->objects[ar->index_current].meta_data;
2853
2854         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2855         if (ret != LDB_SUCCESS) {
2856                 return replmd_replicated_request_error(ar, ret);
2857         }
2858
2859         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2860         if (ret != LDB_SUCCESS) {
2861                 return replmd_replicated_request_error(ar, ret);
2862         }
2863
2864         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2865         if (ret != LDB_SUCCESS) {
2866                 return replmd_replicated_request_error(ar, ret);
2867         }
2868
2869         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2870         if (ret != LDB_SUCCESS) {
2871                 return replmd_replicated_request_error(ar, ret);
2872         }
2873
2874         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2875         if (ret != LDB_SUCCESS) {
2876                 return replmd_replicated_request_error(ar, ret);
2877         }
2878
2879         /* remove any message elements that have zero values */
2880         for (i=0; i<msg->num_elements; i++) {
2881                 struct ldb_message_element *el = &msg->elements[i];
2882
2883                 if (el->num_values == 0) {
2884                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2885                                  el->name));
2886                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2887                         msg->num_elements--;
2888                         i--;
2889                         continue;
2890                 }
2891         }
2892
2893         /*
2894          * the meta data array is already sorted by the caller
2895          */
2896         for (i=0; i < md->ctr.ctr1.count; i++) {
2897                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2898         }
2899         ndr_err = ndr_push_struct_blob(&md_value, msg, md,
2900                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2901         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2902                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2903                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2904         }
2905         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2906         if (ret != LDB_SUCCESS) {
2907                 return replmd_replicated_request_error(ar, ret);
2908         }
2909
2910         replmd_ldb_message_sort(msg, ar->schema);
2911
2912         if (DEBUGLVL(4)) {
2913                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2914                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2915                 talloc_free(s);
2916         }
2917
2918         ret = ldb_build_add_req(&change_req,
2919                                 ldb,
2920                                 ar,
2921                                 msg,
2922                                 ar->controls,
2923                                 ar,
2924                                 replmd_op_callback,
2925                                 ar->req);
2926         LDB_REQ_SET_LOCATION(change_req);
2927         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2928
2929         return ldb_next_request(ar->module, change_req);
2930 }
2931
2932 /*
2933    return true if an update is newer than an existing entry
2934    see section 5.11 of MS-ADTS
2935 */
2936 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2937                                    const struct GUID *update_invocation_id,
2938                                    uint32_t current_version,
2939                                    uint32_t update_version,
2940                                    uint32_t current_usn,
2941                                    uint32_t update_usn,
2942                                    NTTIME current_change_time,
2943                                    NTTIME update_change_time)
2944 {
2945         if (GUID_compare(update_invocation_id, current_invocation_id) == 0) {
2946                 if (update_usn != current_usn) {
2947                         return update_usn >= current_usn;
2948                 }
2949         }
2950         if (update_version != current_version) {
2951                 return update_version >= current_version;
2952         }
2953         if (update_change_time != current_change_time) {
2954                 return update_change_time >= current_change_time;
2955         }
2956         return GUID_compare(update_invocation_id, current_invocation_id) >= 0;
2957 }
2958
2959 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2960                                                   struct replPropertyMetaData1 *new_m)
2961 {
2962         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2963                                       &new_m->originating_invocation_id,
2964                                       cur_m->version,
2965                                       new_m->version,
2966                                       cur_m->originating_usn,
2967                                       new_m->originating_usn,
2968                                       cur_m->originating_change_time,
2969                                       new_m->originating_change_time);
2970 }
2971
2972 static struct replPropertyMetaData1 *
2973 replmd_replPropertyMetaData1_find_attid(struct replPropertyMetaDataBlob *md_blob,
2974                                         enum drsuapi_DsAttributeId attid)
2975 {
2976         uint32_t i;
2977         struct replPropertyMetaDataCtr1 *rpmd_ctr = &md_blob->ctr.ctr1;
2978
2979         for (i = 0; i < rpmd_ctr->count; i++) {
2980                 if (rpmd_ctr->array[i].attid == attid) {
2981                         return &rpmd_ctr->array[i];
2982                 }
2983         }
2984         return NULL;
2985 }
2986
2987
2988 /*
2989   handle renames that come in over DRS replication
2990  */
2991 static int replmd_replicated_handle_rename(struct replmd_replicated_request *ar,
2992                                            struct ldb_message *msg,
2993                                            struct replPropertyMetaDataBlob *rmd,
2994                                            struct replPropertyMetaDataBlob *omd)
2995 {
2996         struct replPropertyMetaData1 *md_remote;
2997         struct replPropertyMetaData1 *md_local;
2998
2999         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) == 0) {
3000                 /* no rename */
3001                 return LDB_SUCCESS;
3002         }
3003
3004         /* now we need to check for double renames. We could have a
3005          * local rename pending which our replication partner hasn't
3006          * received yet. We choose which one wins by looking at the
3007          * attribute stamps on the two objects, the newer one wins
3008          */
3009         md_remote = replmd_replPropertyMetaData1_find_attid(rmd, DRSUAPI_ATTID_name);
3010         md_local  = replmd_replPropertyMetaData1_find_attid(omd, DRSUAPI_ATTID_name);
3011         /* if there is no name attribute then we have to assume the
3012            object we've received is in fact newer */
3013         if (!md_remote || !md_local ||
3014             replmd_replPropertyMetaData1_is_newer(md_local, md_remote)) {
3015                 DEBUG(4,("replmd_replicated_request rename %s => %s\n",
3016                          ldb_dn_get_linearized(ar->search_msg->dn),
3017                          ldb_dn_get_linearized(msg->dn)));
3018                 /* pass rename to the next module
3019                  * so it doesn't appear as an originating update */
3020                 return dsdb_module_rename(ar->module,
3021                                           ar->search_msg->dn, msg->dn,
3022                                           DSDB_FLAG_NEXT_MODULE | DSDB_MODIFY_RELAX);
3023         }
3024
3025         /* we're going to keep our old object */
3026         DEBUG(4,(__location__ ": Keeping object %s and rejecting older rename to %s\n",
3027                  ldb_dn_get_linearized(ar->search_msg->dn),
3028                  ldb_dn_get_linearized(msg->dn)));
3029         return LDB_SUCCESS;
3030 }
3031
3032
3033 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
3034 {
3035         struct ldb_context *ldb;
3036         struct ldb_request *change_req;
3037         enum ndr_err_code ndr_err;
3038         struct ldb_message *msg;
3039         struct replPropertyMetaDataBlob *rmd;
3040         struct replPropertyMetaDataBlob omd;
3041         const struct ldb_val *omd_value;
3042         struct replPropertyMetaDataBlob nmd;
3043         struct ldb_val nmd_value;
3044         unsigned int i;
3045         uint32_t j,ni=0;
3046         unsigned int removed_attrs = 0;
3047         int ret;
3048
3049         ldb = ldb_module_get_ctx(ar->module);
3050         msg = ar->objs->objects[ar->index_current].msg;
3051         rmd = ar->objs->objects[ar->index_current].meta_data;
3052         ZERO_STRUCT(omd);
3053         omd.version = 1;
3054
3055         /* find existing meta data */
3056         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
3057         if (omd_value) {
3058                 ndr_err = ndr_pull_struct_blob(omd_value, ar, &omd,
3059                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
3060                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3061                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3062                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3063                 }
3064
3065                 if (omd.version != 1) {
3066                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3067                 }
3068         }
3069
3070         /* handle renames that come in over DRS */
3071         ret = replmd_replicated_handle_rename(ar, msg, rmd, &omd);
3072         if (ret != LDB_SUCCESS) {
3073                 ldb_debug(ldb, LDB_DEBUG_FATAL,
3074                           "replmd_replicated_request rename %s => %s failed - %s\n",
3075                           ldb_dn_get_linearized(ar->search_msg->dn),
3076                           ldb_dn_get_linearized(msg->dn),
3077                           ldb_errstring(ldb));
3078                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
3079         }
3080
3081         ZERO_STRUCT(nmd);
3082         nmd.version = 1;
3083         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
3084         nmd.ctr.ctr1.array = talloc_array(ar,
3085                                           struct replPropertyMetaData1,
3086                                           nmd.ctr.ctr1.count);
3087         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3088
3089         /* first copy the old meta data */
3090         for (i=0; i < omd.ctr.ctr1.count; i++) {
3091                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
3092                 ni++;
3093         }
3094
3095         /* now merge in the new meta data */
3096         for (i=0; i < rmd->ctr.ctr1.count; i++) {
3097                 bool found = false;
3098
3099                 for (j=0; j < ni; j++) {
3100                         bool cmp;
3101
3102                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
3103                                 continue;
3104                         }
3105
3106                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
3107                                                                     &rmd->ctr.ctr1.array[i]);
3108                         if (cmp) {
3109                                 /* replace the entry */
3110                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
3111                                 found = true;
3112                                 break;
3113                         }
3114
3115                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTID_instanceType) {
3116                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
3117                                          msg->elements[i-removed_attrs].name,
3118                                          ldb_dn_get_linearized(msg->dn),
3119                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
3120                         }
3121
3122                         /* we don't want to apply this change so remove the attribute */
3123                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
3124                         removed_attrs++;
3125
3126                         found = true;
3127                         break;
3128                 }
3129
3130                 if (found) continue;
3131
3132                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
3133                 ni++;
3134         }
3135
3136         /*
3137          * finally correct the size of the meta_data array
3138          */
3139         nmd.ctr.ctr1.count = ni;
3140
3141         /*
3142          * the rdn attribute (the alias for the name attribute),
3143          * 'cn' for most objects is the last entry in the meta data array
3144          * we have stored
3145          *
3146          * sort the new meta data array
3147          */
3148         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
3149         if (ret != LDB_SUCCESS) {
3150                 return ret;
3151         }
3152
3153         /*
3154          * check if some replicated attributes left, otherwise skip the ldb_modify() call
3155          */
3156         if (msg->num_elements == 0) {
3157                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
3158                           ar->index_current);
3159
3160                 ar->index_current++;
3161                 return replmd_replicated_apply_next(ar);
3162         }
3163
3164         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
3165                   ar->index_current, msg->num_elements);
3166
3167         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
3168         if (ret != LDB_SUCCESS) {
3169                 return replmd_replicated_request_error(ar, ret);
3170         }
3171
3172         for (i=0; i<ni; i++) {
3173                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
3174         }
3175
3176         /* create the meta data value */
3177         ndr_err = ndr_push_struct_blob(&nmd_value, msg, &nmd,
3178                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
3179         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3180                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3181                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3182         }
3183
3184         /*
3185          * when we know that we'll modify the record, add the whenChanged, uSNChanged
3186          * and replPopertyMetaData attributes
3187          */
3188         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
3189         if (ret != LDB_SUCCESS) {
3190                 return replmd_replicated_request_error(ar, ret);
3191         }
3192         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
3193         if (ret != LDB_SUCCESS) {
3194                 return replmd_replicated_request_error(ar, ret);
3195         }
3196         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
3197         if (ret != LDB_SUCCESS) {
3198                 return replmd_replicated_request_error(ar, ret);
3199         }
3200
3201         replmd_ldb_message_sort(msg, ar->schema);
3202
3203         /* we want to replace the old values */
3204         for (i=0; i < msg->num_elements; i++) {
3205                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
3206         }
3207
3208         if (DEBUGLVL(4)) {
3209                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3210                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
3211                 talloc_free(s);
3212         }
3213
3214         ret = ldb_build_mod_req(&change_req,
3215                                 ldb,
3216                                 ar,
3217                                 msg,
3218                                 ar->controls,
3219                                 ar,
3220                                 replmd_op_callback,
3221                                 ar->req);
3222         LDB_REQ_SET_LOCATION(change_req);
3223         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3224
3225         return ldb_next_request(ar->module, change_req);
3226 }
3227
3228 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
3229                                                    struct ldb_reply *ares)
3230 {
3231         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3232                                                struct replmd_replicated_request);
3233         int ret;
3234
3235         if (!ares) {
3236                 return ldb_module_done(ar->req, NULL, NULL,
3237                                         LDB_ERR_OPERATIONS_ERROR);
3238         }
3239         if (ares->error != LDB_SUCCESS &&
3240             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3241                 return ldb_module_done(ar->req, ares->controls,
3242                                         ares->response, ares->error);
3243         }
3244
3245         switch (ares->type) {
3246         case LDB_REPLY_ENTRY:
3247                 ar->search_msg = talloc_steal(ar, ares->message);
3248                 break;
3249
3250         case LDB_REPLY_REFERRAL:
3251                 /* we ignore referrals */
3252                 break;
3253
3254         case LDB_REPLY_DONE:
3255                 if (ar->search_msg != NULL) {
3256                         ret = replmd_replicated_apply_merge(ar);
3257                 } else {
3258                         ret = replmd_replicated_apply_add(ar);
3259                 }
3260                 if (ret != LDB_SUCCESS) {
3261                         return ldb_module_done(ar->req, NULL, NULL, ret);
3262                 }
3263         }
3264
3265         talloc_free(ares);
3266         return LDB_SUCCESS;
3267 }
3268
3269 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
3270
3271 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
3272 {
3273         struct ldb_context *ldb;
3274         int ret;
3275         char *tmp_str;
3276         char *filter;
3277         struct ldb_request *search_req;
3278         struct ldb_search_options_control *options;
3279
3280         if (ar->index_current >= ar->objs->num_objects) {
3281                 /* done with it, go to next stage */
3282                 return replmd_replicated_uptodate_vector(ar);
3283         }
3284
3285         ldb = ldb_module_get_ctx(ar->module);
3286         ar->search_msg = NULL;
3287
3288         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
3289         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3290
3291         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
3292         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3293         talloc_free(tmp_str);
3294
3295         ret = ldb_build_search_req(&search_req,
3296                                    ldb,
3297                                    ar,
3298                                    NULL,
3299                                    LDB_SCOPE_SUBTREE,
3300                                    filter,
3301                                    NULL,
3302                                    NULL,
3303                                    ar,
3304                                    replmd_replicated_apply_search_callback,
3305                                    ar->req);
3306         LDB_REQ_SET_LOCATION(search_req);
3307
3308         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_RECYCLED_OID,
3309                                       true, NULL);
3310         if (ret != LDB_SUCCESS) {
3311                 return ret;
3312         }
3313
3314         /* we need to cope with cross-partition links, so search for
3315            the GUID over all partitions */
3316         options = talloc(search_req, struct ldb_search_options_control);
3317         if (options == NULL) {
3318                 DEBUG(0, (__location__ ": out of memory\n"));
3319                 return LDB_ERR_OPERATIONS_ERROR;
3320         }
3321         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
3322
3323         ret = ldb_request_add_control(search_req,
3324                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
3325                                       true, options);
3326         if (ret != LDB_SUCCESS) {
3327                 return ret;
3328         }
3329
3330         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3331
3332         return ldb_next_request(ar->module, search_req);
3333 }
3334
3335 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
3336                                                       struct ldb_reply *ares)
3337 {
3338         struct ldb_context *ldb;
3339         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3340                                                struct replmd_replicated_request);
3341         ldb = ldb_module_get_ctx(ar->module);
3342
3343         if (!ares) {
3344                 return ldb_module_done(ar->req, NULL, NULL,
3345                                         LDB_ERR_OPERATIONS_ERROR);
3346         }
3347         if (ares->error != LDB_SUCCESS) {
3348                 return ldb_module_done(ar->req, ares->controls,
3349                                         ares->response, ares->error);
3350         }
3351
3352         if (ares->type != LDB_REPLY_DONE) {
3353                 ldb_set_errstring(ldb, "Invalid reply type\n!");
3354                 return ldb_module_done(ar->req, NULL, NULL,
3355                                         LDB_ERR_OPERATIONS_ERROR);
3356         }
3357
3358         talloc_free(ares);
3359
3360         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3361 }
3362
3363 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3364 {
3365         struct ldb_context *ldb;
3366         struct ldb_request *change_req;
3367         enum ndr_err_code ndr_err;
3368         struct ldb_message *msg;
3369         struct replUpToDateVectorBlob ouv;
3370         const struct ldb_val *ouv_value;
3371         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3372         struct replUpToDateVectorBlob nuv;
3373         struct ldb_val nuv_value;
3374         struct ldb_message_element *nuv_el = NULL;
3375         const struct GUID *our_invocation_id;
3376         struct ldb_message_element *orf_el = NULL;
3377         struct repsFromToBlob nrf;
3378         struct ldb_val *nrf_value = NULL;
3379         struct ldb_message_element *nrf_el = NULL;
3380         unsigned int i;
3381         uint32_t j,ni=0;
3382         bool found = false;
3383         time_t t = time(NULL);
3384         NTTIME now;
3385         int ret;
3386         uint32_t instanceType;
3387
3388         ldb = ldb_module_get_ctx(ar->module);
3389         ruv = ar->objs->uptodateness_vector;
3390         ZERO_STRUCT(ouv);
3391         ouv.version = 2;
3392         ZERO_STRUCT(nuv);
3393         nuv.version = 2;
3394
3395         unix_to_nt_time(&now, t);
3396
3397         instanceType = ldb_msg_find_attr_as_uint(ar->search_msg, "instanceType", 0);
3398         if (! (instanceType & INSTANCE_TYPE_IS_NC_HEAD)) {
3399                 DEBUG(4,(__location__ ": Skipping UDV and repsFrom update as not NC root: %s\n",
3400                          ldb_dn_get_linearized(ar->search_msg->dn)));
3401                 return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3402         }
3403
3404         /*
3405          * first create the new replUpToDateVector
3406          */
3407         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3408         if (ouv_value) {
3409                 ndr_err = ndr_pull_struct_blob(ouv_value, ar, &ouv,
3410                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3411                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3412                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3413                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3414                 }
3415
3416                 if (ouv.version != 2) {
3417                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3418                 }
3419         }
3420
3421         /*
3422          * the new uptodateness vector will at least
3423          * contain 1 entry, one for the source_dsa
3424          *
3425          * plus optional values from our old vector and the one from the source_dsa
3426          */
3427         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3428         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3429         nuv.ctr.ctr2.cursors = talloc_array(ar,
3430                                             struct drsuapi_DsReplicaCursor2,
3431                                             nuv.ctr.ctr2.count);
3432         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3433
3434         /* first copy the old vector */
3435         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3436                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3437                 ni++;
3438         }
3439
3440         /* get our invocation_id if we have one already attached to the ldb */
3441         our_invocation_id = samdb_ntds_invocation_id(ldb);
3442
3443         /* merge in the source_dsa vector is available */
3444         for (i=0; (ruv && i < ruv->count); i++) {
3445                 found = false;
3446
3447                 if (our_invocation_id &&
3448                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3449                                our_invocation_id)) {
3450                         continue;
3451                 }
3452
3453                 for (j=0; j < ni; j++) {
3454                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3455                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3456                                 continue;
3457                         }
3458
3459                         found = true;
3460
3461                         /*
3462                          * we update only the highest_usn and not the latest_sync_success time,
3463                          * because the last success stands for direct replication
3464                          */
3465                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3466                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3467                         }
3468                         break;
3469                 }
3470
3471                 if (found) continue;
3472
3473                 /* if it's not there yet, add it */
3474                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3475                 ni++;
3476         }
3477
3478         /*
3479          * merge in the current highwatermark for the source_dsa
3480          */
3481         found = false;
3482         for (j=0; j < ni; j++) {
3483                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3484                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3485                         continue;
3486                 }
3487
3488                 found = true;
3489
3490                 /*
3491                  * here we update the highest_usn and last_sync_success time
3492                  * because we're directly replicating from the source_dsa
3493                  *
3494                  * and use the tmp_highest_usn because this is what we have just applied
3495                  * to our ldb
3496                  */
3497                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3498                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3499                 break;
3500         }
3501         if (!found) {
3502                 /*
3503                  * here we update the highest_usn and last_sync_success time
3504                  * because we're directly replicating from the source_dsa
3505                  *
3506                  * and use the tmp_highest_usn because this is what we have just applied
3507                  * to our ldb
3508                  */
3509                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3510                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3511                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3512                 ni++;
3513         }
3514
3515         /*
3516          * finally correct the size of the cursors array
3517          */
3518         nuv.ctr.ctr2.count = ni;
3519
3520         /*
3521          * sort the cursors
3522          */
3523         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
3524
3525         /*
3526          * create the change ldb_message
3527          */
3528         msg = ldb_msg_new(ar);
3529         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3530         msg->dn = ar->search_msg->dn;
3531
3532         ndr_err = ndr_push_struct_blob(&nuv_value, msg, &nuv,
3533                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3534         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3535                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3536                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3537         }
3538         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3539         if (ret != LDB_SUCCESS) {
3540                 return replmd_replicated_request_error(ar, ret);
3541         }
3542         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3543
3544         /*
3545          * now create the new repsFrom value from the given repsFromTo1 structure
3546          */
3547         ZERO_STRUCT(nrf);
3548         nrf.version                                     = 1;
3549         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3550         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3551
3552         /*
3553          * first see if we already have a repsFrom value for the current source dsa
3554          * if so we'll later replace this value
3555          */
3556         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3557         if (orf_el) {
3558                 for (i=0; i < orf_el->num_values; i++) {
3559                         struct repsFromToBlob *trf;
3560
3561                         trf = talloc(ar, struct repsFromToBlob);
3562                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3563
3564                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, trf,
3565                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3566                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3567                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3568                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3569                         }
3570
3571                         if (trf->version != 1) {
3572                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3573                         }
3574
3575                         /*
3576                          * we compare the source dsa objectGUID not the invocation_id
3577                          * because we want only one repsFrom value per source dsa
3578                          * and when the invocation_id of the source dsa has changed we don't need
3579                          * the old repsFrom with the old invocation_id
3580                          */
3581                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3582                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3583                                 talloc_free(trf);
3584                                 continue;
3585                         }
3586
3587                         talloc_free(trf);
3588                         nrf_value = &orf_el->values[i];
3589                         break;
3590                 }
3591
3592                 /*
3593                  * copy over all old values to the new ldb_message
3594                  */
3595                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3596                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3597                 *nrf_el = *orf_el;
3598         }
3599
3600         /*
3601          * if we haven't found an old repsFrom value for the current source dsa
3602          * we'll add a new value
3603          */
3604         if (!nrf_value) {
3605                 struct ldb_val zero_value;
3606                 ZERO_STRUCT(zero_value);
3607                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3608                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3609
3610                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3611         }
3612
3613         /* we now fill the value which is already attached to ldb_message */
3614         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3615                                        &nrf,
3616                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3617         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3618                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3619                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3620         }
3621
3622         /*
3623          * the ldb_message_element for the attribute, has all the old values and the new one
3624          * so we'll replace the whole attribute with all values
3625          */
3626         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3627
3628         if (DEBUGLVL(4)) {
3629                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3630                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3631                 talloc_free(s);
3632         }
3633
3634         /* prepare the ldb_modify() request */
3635         ret = ldb_build_mod_req(&change_req,
3636                                 ldb,
3637                                 ar,
3638                                 msg,
3639                                 ar->controls,
3640                                 ar,
3641                                 replmd_replicated_uptodate_modify_callback,
3642                                 ar->req);
3643         LDB_REQ_SET_LOCATION(change_req);
3644         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3645
3646         return ldb_next_request(ar->module, change_req);
3647 }
3648
3649 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3650                                                       struct ldb_reply *ares)
3651 {
3652         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3653                                                struct replmd_replicated_request);
3654         int ret;
3655
3656         if (!ares) {
3657                 return ldb_module_done(ar->req, NULL, NULL,
3658                                         LDB_ERR_OPERATIONS_ERROR);
3659         }
3660         if (ares->error != LDB_SUCCESS &&
3661             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3662                 return ldb_module_done(ar->req, ares->controls,
3663                                         ares->response, ares->error);
3664         }
3665
3666         switch (ares->type) {
3667         case LDB_REPLY_ENTRY:
3668                 ar->search_msg = talloc_steal(ar, ares->message);
3669                 break;
3670
3671         case LDB_REPLY_REFERRAL:
3672                 /* we ignore referrals */
3673                 break;
3674
3675         case LDB_REPLY_DONE:
3676                 if (ar->search_msg == NULL) {
3677                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3678                 } else {
3679                         ret = replmd_replicated_uptodate_modify(ar);
3680                 }
3681                 if (ret != LDB_SUCCESS) {
3682                         return ldb_module_done(ar->req, NULL, NULL, ret);
3683                 }
3684         }
3685
3686         talloc_free(ares);
3687         return LDB_SUCCESS;
3688 }
3689
3690
3691 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3692 {
3693         struct ldb_context *ldb;
3694         int ret;
3695         static const char *attrs[] = {
3696                 "replUpToDateVector",
3697                 "repsFrom",
3698                 "instanceType",
3699                 NULL
3700         };
3701         struct ldb_request *search_req;
3702
3703         ldb = ldb_module_get_ctx(ar->module);
3704         ar->search_msg = NULL;
3705
3706         ret = ldb_build_search_req(&search_req,
3707                                    ldb,
3708                                    ar,
3709                                    ar->objs->partition_dn,
3710                                    LDB_SCOPE_BASE,
3711                                    "(objectClass=*)",
3712                                    attrs,
3713                                    NULL,
3714                                    ar,
3715                                    replmd_replicated_uptodate_search_callback,
3716                                    ar->req);
3717         LDB_REQ_SET_LOCATION(search_req);
3718         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3719
3720         return ldb_next_request(ar->module, search_req);
3721 }
3722
3723
3724
3725 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3726 {
3727         struct ldb_context *ldb;
3728         struct dsdb_extended_replicated_objects *objs;
3729         struct replmd_replicated_request *ar;
3730         struct ldb_control **ctrls;
3731         int ret;
3732         uint32_t i;
3733         struct replmd_private *replmd_private =
3734                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3735
3736         ldb = ldb_module_get_ctx(module);
3737
3738         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3739
3740         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3741         if (!objs) {
3742                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3743                 return LDB_ERR_PROTOCOL_ERROR;
3744         }
3745
3746         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3747                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3748                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3749                 return LDB_ERR_PROTOCOL_ERROR;
3750         }
3751
3752         ar = replmd_ctx_init(module, req);
3753         if (!ar)
3754                 return LDB_ERR_OPERATIONS_ERROR;
3755
3756         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3757         ar->apply_mode = true;
3758         ar->objs = objs;
3759         ar->schema = dsdb_get_schema(ldb, ar);
3760         if (!ar->schema) {
3761                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3762                 talloc_free(ar);
3763                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3764                 return LDB_ERR_CONSTRAINT_VIOLATION;
3765         }
3766
3767         ctrls = req->controls;
3768
3769         if (req->controls) {
3770                 req->controls = talloc_memdup(ar, req->controls,
3771                                               talloc_get_size(req->controls));
3772                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3773         }
3774
3775         /* This allows layers further down to know if a change came in over replication */
3776         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3777         if (ret != LDB_SUCCESS) {
3778                 return ret;
3779         }
3780
3781         /* If this change contained linked attributes in the body
3782          * (rather than in the links section) we need to update
3783          * backlinks in linked_attributes */
3784         ret = ldb_request_add_control(req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
3785         if (ret != LDB_SUCCESS) {
3786                 return ret;
3787         }
3788
3789         ar->controls = req->controls;
3790         req->controls = ctrls;
3791
3792         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3793
3794         /* save away the linked attributes for the end of the
3795            transaction */
3796         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3797                 struct la_entry *la_entry;
3798
3799                 if (replmd_private->la_ctx == NULL) {
3800                         replmd_private->la_ctx = talloc_new(replmd_private);
3801                 }
3802                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3803                 if (la_entry == NULL) {
3804                         ldb_oom(ldb);
3805                         return LDB_ERR_OPERATIONS_ERROR;
3806                 }
3807                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3808                 if (la_entry->la == NULL) {
3809                         talloc_free(la_entry);
3810                         ldb_oom(ldb);
3811                         return LDB_ERR_OPERATIONS_ERROR;
3812                 }
3813                 *la_entry->la = ar->objs->linked_attributes[i];
3814
3815                 /* we need to steal the non-scalars so they stay
3816                    around until the end of the transaction */
3817                 talloc_steal(la_entry->la, la_entry->la->identifier);
3818                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3819
3820                 DLIST_ADD(replmd_private->la_list, la_entry);
3821         }
3822
3823         return replmd_replicated_apply_next(ar);
3824 }
3825
3826 /*
3827   process one linked attribute structure
3828  */
3829 static int replmd_process_linked_attribute(struct ldb_module *module,
3830                                            struct la_entry *la_entry)
3831 {
3832         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3833         struct ldb_context *ldb = ldb_module_get_ctx(module);
3834         struct ldb_message *msg;
3835         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3836         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
3837         int ret;
3838         const struct dsdb_attribute *attr;
3839         struct dsdb_dn *dsdb_dn;
3840         uint64_t seq_num = 0;
3841         struct ldb_message_element *old_el;
3842         WERROR status;
3843         time_t t = time(NULL);
3844         struct ldb_result *res;
3845         const char *attrs[2];
3846         struct parsed_dn *pdn_list, *pdn;
3847         struct GUID guid = GUID_zero();
3848         NTSTATUS ntstatus;
3849         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3850         const struct GUID *our_invocation_id;
3851
3852 /*
3853 linked_attributes[0]:
3854      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3855         identifier               : *
3856             identifier: struct drsuapi_DsReplicaObjectIdentifier
3857                 __ndr_size               : 0x0000003a (58)
3858                 __ndr_size_sid           : 0x00000000 (0)
3859                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3860                 sid                      : S-0-0
3861                 __ndr_size_dn            : 0x00000000 (0)
3862                 dn                       : ''
3863         attid                    : DRSUAPI_ATTID_member (0x1F)
3864         value: struct drsuapi_DsAttributeValue
3865             __ndr_size               : 0x0000007e (126)
3866             blob                     : *
3867                 blob                     : DATA_BLOB length=126
3868         flags                    : 0x00000001 (1)
3869                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3870         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3871         meta_data: struct drsuapi_DsReplicaMetaData
3872             version                  : 0x00000015 (21)
3873             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3874             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3875             originating_usn          : 0x000000000001e19c (123292)
3876
3877 (for cases where the link is to a normal DN)
3878      &target: struct drsuapi_DsReplicaObjectIdentifier3
3879         __ndr_size               : 0x0000007e (126)
3880         __ndr_size_sid           : 0x0000001c (28)
3881         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3882         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3883         __ndr_size_dn            : 0x00000022 (34)
3884         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3885  */
3886
3887         /* find the attribute being modified */
3888         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3889         if (attr == NULL) {
3890                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3891                 talloc_free(tmp_ctx);
3892                 return LDB_ERR_OPERATIONS_ERROR;
3893         }
3894
3895         attrs[0] = attr->lDAPDisplayName;
3896         attrs[1] = NULL;
3897
3898         /* get the existing message from the db for the object with
3899            this GUID, returning attribute being modified. We will then
3900            use this msg as the basis for a modify call */
3901         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3902                                  DSDB_FLAG_NEXT_MODULE |
3903                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3904                                  DSDB_SEARCH_SHOW_RECYCLED |
3905                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3906                                  DSDB_SEARCH_REVEAL_INTERNALS,
3907                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3908         if (ret != LDB_SUCCESS) {
3909                 talloc_free(tmp_ctx);
3910                 return ret;
3911         }
3912         if (res->count != 1) {
3913                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3914                                        GUID_string(tmp_ctx, &la->identifier->guid));
3915                 talloc_free(tmp_ctx);
3916                 return LDB_ERR_NO_SUCH_OBJECT;
3917         }
3918         msg = res->msgs[0];
3919
3920         if (msg->num_elements == 0) {
3921                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3922                 if (ret != LDB_SUCCESS) {
3923                         ldb_module_oom(module);
3924                         talloc_free(tmp_ctx);
3925                         return LDB_ERR_OPERATIONS_ERROR;
3926                 }
3927         } else {
3928                 old_el = &msg->elements[0];
3929                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3930         }
3931
3932         /* parse the existing links */
3933         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3934         if (ret != LDB_SUCCESS) {
3935                 talloc_free(tmp_ctx);
3936                 return ret;
3937         }
3938
3939         /* get our invocationId */
3940         our_invocation_id = samdb_ntds_invocation_id(ldb);
3941         if (!our_invocation_id) {
3942                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3943                 talloc_free(tmp_ctx);
3944                 return LDB_ERR_OPERATIONS_ERROR;
3945         }
3946
3947         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
3948         if (ret != LDB_SUCCESS) {
3949                 talloc_free(tmp_ctx);
3950                 return ret;
3951         }
3952
3953         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3954         if (!W_ERROR_IS_OK(status)) {
3955                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3956                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3957                 return LDB_ERR_OPERATIONS_ERROR;
3958         }
3959
3960         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3961         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3962                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3963                                        old_el->name,
3964                                        ldb_dn_get_linearized(dsdb_dn->dn),
3965                                        ldb_dn_get_linearized(msg->dn));
3966                 return LDB_ERR_OPERATIONS_ERROR;
3967         }
3968
3969         /* re-resolve the DN by GUID, as the DRS server may give us an
3970            old DN value */
3971         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
3972         if (ret != LDB_SUCCESS) {
3973                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s",
3974                          GUID_string(tmp_ctx, &guid),
3975                          ldb_dn_get_linearized(dsdb_dn->dn)));
3976         }
3977
3978         /* see if this link already exists */
3979         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3980         if (pdn != NULL) {
3981                 /* see if this update is newer than what we have already */
3982                 struct GUID invocation_id = GUID_zero();
3983                 uint32_t version = 0;
3984                 uint32_t originating_usn = 0;
3985                 NTTIME change_time = 0;
3986                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3987
3988                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3989                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3990                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &originating_usn, "RMD_ORIGINATING_USN");
3991                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3992
3993                 if (!replmd_update_is_newer(&invocation_id,
3994                                             &la->meta_data.originating_invocation_id,
3995                                             version,
3996                                             la->meta_data.version,
3997                                             originating_usn,
3998                                             la->meta_data.originating_usn,
3999                                             change_time,
4000                                             la->meta_data.originating_change_time)) {
4001                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
4002                                  old_el->name, ldb_dn_get_linearized(msg->dn),
4003                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
4004                         talloc_free(tmp_ctx);
4005                         return LDB_SUCCESS;
4006                 }
4007
4008                 /* get a seq_num for this change */
4009                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
4010                 if (ret != LDB_SUCCESS) {
4011                         talloc_free(tmp_ctx);
4012                         return ret;
4013                 }
4014
4015                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
4016                         /* remove the existing backlink */
4017                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
4018                         if (ret != LDB_SUCCESS) {
4019                                 talloc_free(tmp_ctx);
4020                                 return ret;
4021                         }
4022                 }
4023
4024                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
4025                                            &la->meta_data.originating_invocation_id,
4026                                            la->meta_data.originating_usn, seq_num,
4027                                            la->meta_data.originating_change_time,
4028                                            la->meta_data.version,
4029                                            !active);
4030                 if (ret != LDB_SUCCESS) {
4031                         talloc_free(tmp_ctx);
4032                         return ret;
4033                 }
4034
4035                 if (active) {
4036                         /* add the new backlink */
4037                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
4038                         if (ret != LDB_SUCCESS) {
4039                                 talloc_free(tmp_ctx);
4040                                 return ret;
4041                         }
4042                 }
4043         } else {
4044                 /* get a seq_num for this change */
4045                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
4046                 if (ret != LDB_SUCCESS) {
4047                         talloc_free(tmp_ctx);
4048                         return ret;
4049                 }
4050
4051                 old_el->values = talloc_realloc(msg->elements, old_el->values,
4052                                                 struct ldb_val, old_el->num_values+1);
4053                 if (!old_el->values) {
4054                         ldb_module_oom(module);
4055                         return LDB_ERR_OPERATIONS_ERROR;
4056                 }
4057                 old_el->num_values++;
4058
4059                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
4060                                           &la->meta_data.originating_invocation_id,
4061                                           la->meta_data.originating_usn, seq_num,
4062                                           la->meta_data.originating_change_time,
4063                                           la->meta_data.version,
4064                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
4065                 if (ret != LDB_SUCCESS) {
4066                         talloc_free(tmp_ctx);
4067                         return ret;
4068                 }
4069
4070                 if (active) {
4071                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
4072                                                   true, attr, false);
4073                         if (ret != LDB_SUCCESS) {
4074                                 talloc_free(tmp_ctx);
4075                                 return ret;
4076                         }
4077                 }
4078         }
4079
4080         /* we only change whenChanged and uSNChanged if the seq_num
4081            has changed */
4082         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
4083                 talloc_free(tmp_ctx);
4084                 return ldb_operr(ldb);
4085         }
4086
4087         if (add_uint64_element(ldb, msg, "uSNChanged",
4088                                seq_num) != LDB_SUCCESS) {
4089                 talloc_free(tmp_ctx);
4090                 return ldb_operr(ldb);
4091         }
4092
4093         old_el = ldb_msg_find_element(msg, attr->lDAPDisplayName);
4094         if (old_el == NULL) {
4095                 talloc_free(tmp_ctx);
4096                 return ldb_operr(ldb);
4097         }
4098
4099         ret = dsdb_check_single_valued_link(attr, old_el);
4100         if (ret != LDB_SUCCESS) {
4101                 talloc_free(tmp_ctx);
4102                 return ret;
4103         }
4104
4105         old_el->flags |= LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK;
4106
4107         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE);
4108         if (ret != LDB_SUCCESS) {
4109                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
4110                           ldb_errstring(ldb),
4111                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
4112                 talloc_free(tmp_ctx);
4113                 return ret;
4114         }
4115
4116         talloc_free(tmp_ctx);
4117
4118         return ret;
4119 }
4120
4121 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
4122 {
4123         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
4124                 return replmd_extended_replicated_objects(module, req);
4125         }
4126
4127         return ldb_next_request(module, req);
4128 }
4129
4130
4131 /*
4132   we hook into the transaction operations to allow us to
4133   perform the linked attribute updates at the end of the whole
4134   transaction. This allows a forward linked attribute to be created
4135   before the object is created. During a vampire, w2k8 sends us linked
4136   attributes before the objects they are part of.
4137  */
4138 static int replmd_start_transaction(struct ldb_module *module)
4139 {
4140         /* create our private structure for this transaction */
4141         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
4142                                                                 struct replmd_private);
4143         replmd_txn_cleanup(replmd_private);
4144
4145         /* free any leftover mod_usn records from cancelled
4146            transactions */
4147         while (replmd_private->ncs) {
4148                 struct nc_entry *e = replmd_private->ncs;
4149                 DLIST_REMOVE(replmd_private->ncs, e);
4150                 talloc_free(e);
4151         }
4152
4153         return ldb_next_start_trans(module);
4154 }
4155
4156 /*
4157   on prepare commit we loop over our queued la_context structures and
4158   apply each of them
4159  */
4160 static int replmd_prepare_commit(struct ldb_module *module)
4161 {
4162         struct replmd_private *replmd_private =
4163                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4164         struct la_entry *la, *prev;
4165         struct la_backlink *bl;
4166         int ret;
4167
4168         /* walk the list backwards, to do the first entry first, as we
4169          * added the entries with DLIST_ADD() which puts them at the
4170          * start of the list */
4171         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
4172                 prev = DLIST_PREV(la);
4173                 DLIST_REMOVE(replmd_private->la_list, la);
4174                 ret = replmd_process_linked_attribute(module, la);
4175                 if (ret != LDB_SUCCESS) {
4176                         replmd_txn_cleanup(replmd_private);
4177                         return ret;
4178                 }
4179         }
4180
4181         /* process our backlink list, creating and deleting backlinks
4182            as necessary */
4183         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
4184                 ret = replmd_process_backlink(module, bl);
4185                 if (ret != LDB_SUCCESS) {
4186                         replmd_txn_cleanup(replmd_private);
4187                         return ret;
4188                 }
4189         }
4190
4191         replmd_txn_cleanup(replmd_private);
4192
4193         /* possibly change @REPLCHANGED */
4194         ret = replmd_notify_store(module);
4195         if (ret != LDB_SUCCESS) {
4196                 return ret;
4197         }
4198
4199         return ldb_next_prepare_commit(module);
4200 }
4201
4202 static int replmd_del_transaction(struct ldb_module *module)
4203 {
4204         struct replmd_private *replmd_private =
4205                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4206         replmd_txn_cleanup(replmd_private);
4207
4208         return ldb_next_del_trans(module);
4209 }
4210
4211
4212 static const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
4213         .name          = "repl_meta_data",
4214         .init_context      = replmd_init,
4215         .add               = replmd_add,
4216         .modify            = replmd_modify,
4217         .rename            = replmd_rename,
4218         .del               = replmd_delete,
4219         .extended          = replmd_extended,
4220         .start_transaction = replmd_start_transaction,
4221         .prepare_commit    = replmd_prepare_commit,
4222         .del_transaction   = replmd_del_transaction,
4223 };
4224
4225 int ldb_repl_meta_data_module_init(const char *version)
4226 {
4227         LDB_MODULE_CHECK_VERSION(version);
4228         return ldb_register_module(&ldb_repl_meta_data_module_ops);
4229 }