source4/dsdb/samdb/ldb_modules/repl_meta_data.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2004-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  *  Name: ldb
  25  *
  26  *  Component: ldb repl_meta_data module
  27  *
  28  *  Description: - add a unique objectGUID onto every new record,
  29  *               - handle whenCreated, whenChanged timestamps
  30  *               - handle uSNCreated, uSNChanged numbers
  31  *               - handle replPropertyMetaData attribute
  32  *
  33  *  Author: Simo Sorce
  34  *  Author: Stefan Metzmacher
  35  */
  36
  37 #include "includes.h"
  38 #include "ldb_module.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "dsdb/common/proto.h"
  41 #include "../libds/common/flags.h"
  42 #include "librpc/gen_ndr/ndr_misc.h"
  43 #include "librpc/gen_ndr/ndr_drsuapi.h"
  44 #include "librpc/gen_ndr/ndr_drsblobs.h"
  45 #include "param/param.h"
  46 #include "libcli/security/dom_sid.h"
  47 #include "lib/util/dlinklist.h"
  48 #include "dsdb/samdb/ldb_modules/util.h"
  49 #include "lib/util/binsearch.h"
  50 #include "libcli/security/security.h"
  51 #include "lib/util/tsort.h"
  52
  53 #define W2K3_LINKED_ATTRIBUTES 1
  54
  55 struct replmd_private {
  56         TALLOC_CTX *la_ctx;
  57         struct la_entry *la_list;
  58         TALLOC_CTX *bl_ctx;
  59         struct la_backlink *la_backlinks;
  60         struct nc_entry {
  61                 struct nc_entry *prev, *next;
  62                 struct ldb_dn *dn;
  63                 uint64_t mod_usn;
  64                 uint64_t mod_usn_urgent;
  65         } *ncs;
  66 };
  67
  68 struct la_entry {
  69         struct la_entry *next, *prev;
  70         struct drsuapi_DsReplicaLinkedAttribute *la;
  71 };
  72
  73 struct replmd_replicated_request {
  74         struct ldb_module *module;
  75         struct ldb_request *req;
  76
  77         const struct dsdb_schema *schema;
  78
  79         /* the controls we pass down */
  80         struct ldb_control **controls;
  81
  82         /* details for the mode where we apply a bunch of inbound replication meessages */
  83         bool apply_mode;
  84         uint32_t index_current;
  85         struct dsdb_extended_replicated_objects *objs;
  86
  87         struct ldb_message *search_msg;
  88
  89         uint64_t seq_num;
  90         bool is_urgent;
  91 };
  92
  93 enum urgent_situation {
  94         REPL_URGENT_ON_CREATE = 1,
  95         REPL_URGENT_ON_UPDATE = 2,
  96         REPL_URGENT_ON_DELETE = 4
  97 };
  98
  99
 100 static const struct {
 101         const char *update_name;
 102         enum urgent_situation repl_situation;
 103 } urgent_objects[] = {
 104                 {"nTDSDSA", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 105                 {"crossRef", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 106                 {"attributeSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 107                 {"classSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 108                 {"secret", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 109                 {"rIDManager", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 110                 {NULL, 0}
 111 };
 112
 113 /* Attributes looked for when updating or deleting, to check for a urgent replication needed */
 114 static const char *urgent_attrs[] = {
 115                 "lockoutTime",
 116                 "pwdLastSet",
 117                 "userAccountControl",
 118                 NULL
 119 };
 120
 121
 122 static bool replmd_check_urgent_objectclass(const struct ldb_message_element *objectclass_el,
 123                                         enum urgent_situation situation)
 124 {
 125         unsigned int i, j;
 126         for (i=0; urgent_objects[i].update_name; i++) {
 127
 128                 if ((situation & urgent_objects[i].repl_situation) == 0) {
 129                         continue;
 130                 }
 131
 132                 for (j=0; j<objectclass_el->num_values; j++) {
 133                         const struct ldb_val *v = &objectclass_el->values[j];
 134                         if (ldb_attr_cmp((const char *)v->data, urgent_objects[i].update_name) == 0) {
 135                                 return true;
 136                         }
 137                 }
 138         }
 139         return false;
 140 }
 141
 142 static bool replmd_check_urgent_attribute(const struct ldb_message_element *el)
 143 {
 144         if (ldb_attr_in_list(urgent_attrs, el->name)) {
 145                 return true;
 146         }
 147         return false;
 148 }
 149
 150
 151 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
 152
 153 /*
 154   initialise the module
 155   allocate the private structure and build the list
 156   of partition DNs for use by replmd_notify()
 157  */
 158 static int replmd_init(struct ldb_module *module)
 159 {
 160         struct replmd_private *replmd_private;
 161         struct ldb_context *ldb = ldb_module_get_ctx(module);
 162
 163         replmd_private = talloc_zero(module, struct replmd_private);
 164         if (replmd_private == NULL) {
 165                 ldb_oom(ldb);
 166                 return LDB_ERR_OPERATIONS_ERROR;
 167         }
 168         ldb_module_set_private(module, replmd_private);
 169
 170         return ldb_next_init(module);
 171 }
 172
 173 /*
 174   cleanup our per-transaction contexts
 175  */
 176 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 177 {
 178         talloc_free(replmd_private->la_ctx);
 179         replmd_private->la_list = NULL;
 180         replmd_private->la_ctx = NULL;
 181
 182         talloc_free(replmd_private->bl_ctx);
 183         replmd_private->la_backlinks = NULL;
 184         replmd_private->bl_ctx = NULL;
 185 }
 186
 187
 188 struct la_backlink {
 189         struct la_backlink *next, *prev;
 190         const char *attr_name;
 191         struct GUID forward_guid, target_guid;
 192         bool active;
 193 };
 194
 195 /*
 196   process a backlinks we accumulated during a transaction, adding and
 197   deleting the backlinks from the target objects
 198  */
 199 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl)
 200 {
 201         struct ldb_dn *target_dn, *source_dn;
 202         int ret;
 203         struct ldb_context *ldb = ldb_module_get_ctx(module);
 204         struct ldb_message *msg;
 205         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 206         char *dn_string;
 207
 208         /*
 209           - find DN of target
 210           - find DN of source
 211           - construct ldb_message
 212               - either an add or a delete
 213          */
 214         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn);
 215         if (ret != LDB_SUCCESS) {
 216                 DEBUG(2,(__location__ ": WARNING: Failed to find target DN for linked attribute with GUID %s\n",
 217                          GUID_string(bl, &bl->target_guid)));
 218                 return LDB_SUCCESS;
 219         }
 220
 221         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
 222         if (ret != LDB_SUCCESS) {
 223                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 224                                        GUID_string(bl, &bl->forward_guid));
 225                 talloc_free(tmp_ctx);
 226                 return ret;
 227         }
 228
 229         msg = ldb_msg_new(tmp_ctx);
 230         if (msg == NULL) {
 231                 ldb_module_oom(module);
 232                 talloc_free(tmp_ctx);
 233                 return LDB_ERR_OPERATIONS_ERROR;
 234         }
 235
 236         /* construct a ldb_message for adding/deleting the backlink */
 237         msg->dn = target_dn;
 238         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 239         if (!dn_string) {
 240                 ldb_module_oom(module);
 241                 talloc_free(tmp_ctx);
 242                 return LDB_ERR_OPERATIONS_ERROR;
 243         }
 244         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 245         if (ret != LDB_SUCCESS) {
 246                 talloc_free(tmp_ctx);
 247                 return ret;
 248         }
 249         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 250
 251         ret = dsdb_module_modify(module, msg, 0);
 252         if (ret != LDB_SUCCESS) {
 253                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 254                                        bl->active?"add":"remove",
 255                                        ldb_dn_get_linearized(source_dn),
 256                                        ldb_dn_get_linearized(target_dn),
 257                                        ldb_errstring(ldb));
 258                 talloc_free(tmp_ctx);
 259                 return ret;
 260         }
 261         talloc_free(tmp_ctx);
 262         return ret;
 263 }
 264
 265 /*
 266   add a backlink to the list of backlinks to add/delete in the prepare
 267   commit
 268  */
 269 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 270                                struct GUID *forward_guid, struct GUID *target_guid,
 271                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 272 {
 273         const struct dsdb_attribute *target_attr;
 274         struct la_backlink *bl;
 275         struct replmd_private *replmd_private =
 276                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 277
 278         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 279         if (!target_attr) {
 280                 /*
 281                  * windows 2003 has a broken schema where the
 282                  * definition of msDS-IsDomainFor is missing (which is
 283                  * supposed to be the backlink of the
 284                  * msDS-HasDomainNCs attribute
 285                  */
 286                 return LDB_SUCCESS;
 287         }
 288
 289         /* see if its already in the list */
 290         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 291                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 292                     GUID_equal(target_guid, &bl->target_guid) &&
 293                     (target_attr->lDAPDisplayName == bl->attr_name ||
 294                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 295                         break;
 296                 }
 297         }
 298
 299         if (bl) {
 300                 /* we found an existing one */
 301                 if (bl->active == active) {
 302                         return LDB_SUCCESS;
 303                 }
 304                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 305                 talloc_free(bl);
 306                 return LDB_SUCCESS;
 307         }
 308
 309         if (replmd_private->bl_ctx == NULL) {
 310                 replmd_private->bl_ctx = talloc_new(replmd_private);
 311                 if (replmd_private->bl_ctx == NULL) {
 312                         ldb_module_oom(module);
 313                         return LDB_ERR_OPERATIONS_ERROR;
 314                 }
 315         }
 316
 317         /* its a new one */
 318         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 319         if (bl == NULL) {
 320                 ldb_module_oom(module);
 321                 return LDB_ERR_OPERATIONS_ERROR;
 322         }
 323
 324         /* Ensure the schema does not go away before the bl->attr_name is used */
 325         if (!talloc_reference(bl, schema)) {
 326                 talloc_free(bl);
 327                 ldb_module_oom(module);
 328                 return LDB_ERR_OPERATIONS_ERROR;
 329         }
 330
 331         bl->attr_name = target_attr->lDAPDisplayName;
 332         bl->forward_guid = *forward_guid;
 333         bl->target_guid = *target_guid;
 334         bl->active = active;
 335
 336         /* the caller may ask for this backlink to be processed
 337            immediately */
 338         if (immediate) {
 339                 int ret = replmd_process_backlink(module, bl);
 340                 talloc_free(bl);
 341                 return ret;
 342         }
 343
 344         DLIST_ADD(replmd_private->la_backlinks, bl);
 345
 346         return LDB_SUCCESS;
 347 }
 348
 349
 350 /*
 351  * Callback for most write operations in this module:
 352  *
 353  * notify the repl task that a object has changed. The notifies are
 354  * gathered up in the replmd_private structure then written to the
 355  * @REPLCHANGED object in each partition during the prepare_commit
 356  */
 357 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 358 {
 359         int ret;
 360         struct replmd_replicated_request *ac =
 361                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 362         struct replmd_private *replmd_private =
 363                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 364         struct nc_entry *modified_partition;
 365         struct ldb_control *partition_ctrl;
 366         const struct dsdb_control_current_partition *partition;
 367
 368         struct ldb_control **controls;
 369
 370         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 371
 372         /* Remove the 'partition' control from what we pass up the chain */
 373         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 374
 375         if (ares->error != LDB_SUCCESS) {
 376                 return ldb_module_done(ac->req, controls,
 377                                         ares->response, ares->error);
 378         }
 379
 380         if (ares->type != LDB_REPLY_DONE) {
 381                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 382                 return ldb_module_done(ac->req, NULL,
 383                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 384         }
 385
 386         if (!partition_ctrl) {
 387                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 388                 return ldb_module_done(ac->req, NULL,
 389                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 390         }
 391
 392         partition = talloc_get_type_abort(partition_ctrl->data,
 393                                     struct dsdb_control_current_partition);
 394
 395         if (ac->seq_num > 0) {
 396                 for (modified_partition = replmd_private->ncs; modified_partition;
 397                      modified_partition = modified_partition->next) {
 398                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 399                                 break;
 400                         }
 401                 }
 402
 403                 if (modified_partition == NULL) {
 404                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 405                         if (!modified_partition) {
 406                                 ldb_oom(ldb_module_get_ctx(ac->module));
 407                                 return ldb_module_done(ac->req, NULL,
 408                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 409                         }
 410                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 411                         if (!modified_partition->dn) {
 412                                 ldb_oom(ldb_module_get_ctx(ac->module));
 413                                 return ldb_module_done(ac->req, NULL,
 414                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 415                         }
 416                         DLIST_ADD(replmd_private->ncs, modified_partition);
 417                 }
 418
 419                 if (ac->seq_num > modified_partition->mod_usn) {
 420                         modified_partition->mod_usn = ac->seq_num;
 421                         if (ac->is_urgent) {
 422                                 modified_partition->mod_usn_urgent = ac->seq_num;
 423                         }
 424                 }
 425         }
 426
 427         if (ac->apply_mode) {
 428                 talloc_free(ares);
 429                 ac->index_current++;
 430
 431                 ret = replmd_replicated_apply_next(ac);
 432                 if (ret != LDB_SUCCESS) {
 433                         return ldb_module_done(ac->req, NULL, NULL, ret);
 434                 }
 435                 return ret;
 436         } else {
 437                 /* free the partition control container here, for the
 438                  * common path.  Other cases will have it cleaned up
 439                  * eventually with the ares */
 440                 talloc_free(partition_ctrl);
 441                 return ldb_module_done(ac->req,
 442                                        controls_except_specified(controls, ares, partition_ctrl),
 443                                        ares->response, LDB_SUCCESS);
 444         }
 445 }
 446
 447
 448 /*
 449  * update a @REPLCHANGED record in each partition if there have been
 450  * any writes of replicated data in the partition
 451  */
 452 static int replmd_notify_store(struct ldb_module *module)
 453 {
 454         struct replmd_private *replmd_private =
 455                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 456
 457         while (replmd_private->ncs) {
 458                 int ret;
 459                 struct nc_entry *modified_partition = replmd_private->ncs;
 460
 461                 ret = dsdb_module_save_partition_usn(module, modified_partition->dn,
 462                                                      modified_partition->mod_usn,
 463                                                      modified_partition->mod_usn_urgent);
 464                 if (ret != LDB_SUCCESS) {
 465                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 466                                  ldb_dn_get_linearized(modified_partition->dn)));
 467                         return ret;
 468                 }
 469                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 470                 talloc_free(modified_partition);
 471         }
 472
 473         return LDB_SUCCESS;
 474 }
 475
 476
 477 /*
 478   created a replmd_replicated_request context
 479  */
 480 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 481                                                          struct ldb_request *req)
 482 {
 483         struct ldb_context *ldb;
 484         struct replmd_replicated_request *ac;
 485
 486         ldb = ldb_module_get_ctx(module);
 487
 488         ac = talloc_zero(req, struct replmd_replicated_request);
 489         if (ac == NULL) {
 490                 ldb_oom(ldb);
 491                 return NULL;
 492         }
 493
 494         ac->module = module;
 495         ac->req = req;
 496
 497         ac->schema = dsdb_get_schema(ldb, ac);
 498         if (!ac->schema) {
 499                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 500                               "replmd_modify: no dsdb_schema loaded");
 501                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 502                 return NULL;
 503         }
 504
 505         return ac;
 506 }
 507
 508 /*
 509   add a time element to a record
 510 */
 511 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 512 {
 513         struct ldb_message_element *el;
 514         char *s;
 515
 516         if (ldb_msg_find_element(msg, attr) != NULL) {
 517                 return LDB_SUCCESS;
 518         }
 519
 520         s = ldb_timestring(msg, t);
 521         if (s == NULL) {
 522                 return LDB_ERR_OPERATIONS_ERROR;
 523         }
 524
 525         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 526                 return LDB_ERR_OPERATIONS_ERROR;
 527         }
 528
 529         el = ldb_msg_find_element(msg, attr);
 530         /* always set as replace. This works because on add ops, the flag
 531            is ignored */
 532         el->flags = LDB_FLAG_MOD_REPLACE;
 533
 534         return LDB_SUCCESS;
 535 }
 536
 537 /*
 538   add a uint64_t element to a record
 539 */
 540 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 541 {
 542         struct ldb_message_element *el;
 543
 544         if (ldb_msg_find_element(msg, attr) != NULL) {
 545                 return LDB_SUCCESS;
 546         }
 547
 548         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 549                 return LDB_ERR_OPERATIONS_ERROR;
 550         }
 551
 552         el = ldb_msg_find_element(msg, attr);
 553         /* always set as replace. This works because on add ops, the flag
 554            is ignored */
 555         el->flags = LDB_FLAG_MOD_REPLACE;
 556
 557         return LDB_SUCCESS;
 558 }
 559
 560 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 561                                                    const struct replPropertyMetaData1 *m2,
 562                                                    const uint32_t *rdn_attid)
 563 {
 564         if (m1->attid == m2->attid) {
 565                 return 0;
 566         }
 567
 568         /*
 569          * the rdn attribute should be at the end!
 570          * so we need to return a value greater than zero
 571          * which means m1 is greater than m2
 572          */
 573         if (m1->attid == *rdn_attid) {
 574                 return 1;
 575         }
 576
 577         /*
 578          * the rdn attribute should be at the end!
 579          * so we need to return a value less than zero
 580          * which means m2 is greater than m1
 581          */
 582         if (m2->attid == *rdn_attid) {
 583                 return -1;
 584         }
 585
 586         return m1->attid > m2->attid ? 1 : -1;
 587 }
 588
 589 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 590                                                 const struct dsdb_schema *schema,
 591                                                 struct ldb_dn *dn)
 592 {
 593         const char *rdn_name;
 594         const struct dsdb_attribute *rdn_sa;
 595
 596         rdn_name = ldb_dn_get_rdn_name(dn);
 597         if (!rdn_name) {
 598                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 599                 return LDB_ERR_OPERATIONS_ERROR;
 600         }
 601
 602         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 603         if (rdn_sa == NULL) {
 604                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 605                 return LDB_ERR_OPERATIONS_ERROR;
 606         }
 607
 608         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 609                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 610
 611         LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
 612
 613         return LDB_SUCCESS;
 614 }
 615
 616 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 617                                                  const struct ldb_message_element *e2,
 618                                                  const struct dsdb_schema *schema)
 619 {
 620         const struct dsdb_attribute *a1;
 621         const struct dsdb_attribute *a2;
 622
 623         /*
 624          * TODO: make this faster by caching the dsdb_attribute pointer
 625          *       on the ldb_messag_element
 626          */
 627
 628         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 629         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 630
 631         /*
 632          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 633          *       in the schema
 634          */
 635         if (!a1 || !a2) {
 636                 return strcasecmp(e1->name, e2->name);
 637         }
 638         if (a1->attributeID_id == a2->attributeID_id) {
 639                 return 0;
 640         }
 641         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 642 }
 643
 644 static void replmd_ldb_message_sort(struct ldb_message *msg,
 645                                     const struct dsdb_schema *schema)
 646 {
 647         LDB_TYPESAFE_QSORT(msg->elements, msg->num_elements, schema, replmd_ldb_message_element_attid_sort);
 648 }
 649
 650 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 651                                const struct GUID *invocation_id, uint64_t seq_num,
 652                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 653
 654
 655 /*
 656   fix up linked attributes in replmd_add.
 657   This involves setting up the right meta-data in extended DN
 658   components, and creating backlinks to the object
 659  */
 660 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 661                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 662                              struct GUID *guid, const struct dsdb_attribute *sa)
 663 {
 664         unsigned int i;
 665         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 666         struct ldb_context *ldb = ldb_module_get_ctx(module);
 667
 668         /* We will take a reference to the schema in replmd_add_backlink */
 669         const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
 670         NTTIME now;
 671
 672         unix_to_nt_time(&now, t);
 673
 674         for (i=0; i<el->num_values; i++) {
 675                 struct ldb_val *v = &el->values[i];
 676                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 677                 struct GUID target_guid;
 678                 NTSTATUS status;
 679                 int ret;
 680
 681                 /* note that the DN already has the extended
 682                    components from the extended_dn_store module */
 683                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 684                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 685                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid);
 686                         if (ret != LDB_SUCCESS) {
 687                                 talloc_free(tmp_ctx);
 688                                 return ret;
 689                         }
 690                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 691                         if (ret != LDB_SUCCESS) {
 692                                 talloc_free(tmp_ctx);
 693                                 return ret;
 694                         }
 695                 }
 696
 697                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 698                                           seq_num, seq_num, now, 0, false);
 699                 if (ret != LDB_SUCCESS) {
 700                         talloc_free(tmp_ctx);
 701                         return ret;
 702                 }
 703
 704                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 705                 if (ret != LDB_SUCCESS) {
 706                         talloc_free(tmp_ctx);
 707                         return ret;
 708                 }
 709         }
 710
 711         talloc_free(tmp_ctx);
 712         return LDB_SUCCESS;
 713 }
 714
 715
 716 /*
 717   intercept add requests
 718  */
 719 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 720 {
 721         struct ldb_context *ldb;
 722         struct ldb_control *control;
 723         struct replmd_replicated_request *ac;
 724         enum ndr_err_code ndr_err;
 725         struct ldb_request *down_req;
 726         struct ldb_message *msg;
 727         const DATA_BLOB *guid_blob;
 728         struct GUID guid;
 729         struct replPropertyMetaDataBlob nmd;
 730         struct ldb_val nmd_value;
 731         const struct GUID *our_invocation_id;
 732         time_t t = time(NULL);
 733         NTTIME now;
 734         char *time_str;
 735         int ret;
 736         unsigned int i;
 737         uint32_t ni=0;
 738         bool allow_add_guid = false;
 739         bool remove_current_guid = false;
 740         bool is_urgent = false;
 741         struct ldb_message_element *objectclass_el;
 742
 743         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 744         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 745         if (control) {
 746                 allow_add_guid = true;
 747         }
 748
 749         /* do not manipulate our control entries */
 750         if (ldb_dn_is_special(req->op.add.message->dn)) {
 751                 return ldb_next_request(module, req);
 752         }
 753
 754         ldb = ldb_module_get_ctx(module);
 755
 756         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 757
 758         ac = replmd_ctx_init(module, req);
 759         if (!ac) {
 760                 return LDB_ERR_OPERATIONS_ERROR;
 761         }
 762
 763         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 764         if ( guid_blob != NULL ) {
 765                 if( !allow_add_guid ) {
 766                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 767                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 768                         talloc_free(ac);
 769                         return LDB_ERR_UNWILLING_TO_PERFORM;
 770                 } else {
 771                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 772                         if ( !NT_STATUS_IS_OK(status)) {
 773                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 774                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 775                                 talloc_free(ac);
 776                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 777                         }
 778                         /* we remove this attribute as it can be a string and will not be treated
 779                         correctly and then we will readd it latter on in the good format*/
 780                         remove_current_guid = true;
 781                 }
 782         } else {
 783                 /* a new GUID */
 784                 guid = GUID_random();
 785         }
 786
 787         /* Get a sequence number from the backend */
 788         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 789         if (ret != LDB_SUCCESS) {
 790                 talloc_free(ac);
 791                 return ret;
 792         }
 793
 794         /* get our invocationId */
 795         our_invocation_id = samdb_ntds_invocation_id(ldb);
 796         if (!our_invocation_id) {
 797                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 798                               "replmd_add: unable to find invocationId\n");
 799                 talloc_free(ac);
 800                 return LDB_ERR_OPERATIONS_ERROR;
 801         }
 802
 803         /* we have to copy the message as the caller might have it as a const */
 804         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 805         if (msg == NULL) {
 806                 ldb_oom(ldb);
 807                 talloc_free(ac);
 808                 return LDB_ERR_OPERATIONS_ERROR;
 809         }
 810
 811         /* generated times */
 812         unix_to_nt_time(&now, t);
 813         time_str = ldb_timestring(msg, t);
 814         if (!time_str) {
 815                 ldb_oom(ldb);
 816                 talloc_free(ac);
 817                 return LDB_ERR_OPERATIONS_ERROR;
 818         }
 819         if (remove_current_guid) {
 820                 ldb_msg_remove_attr(msg,"objectGUID");
 821         }
 822
 823         /*
 824          * remove autogenerated attributes
 825          */
 826         ldb_msg_remove_attr(msg, "whenCreated");
 827         ldb_msg_remove_attr(msg, "whenChanged");
 828         ldb_msg_remove_attr(msg, "uSNCreated");
 829         ldb_msg_remove_attr(msg, "uSNChanged");
 830         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 831
 832         /*
 833          * readd replicated attributes
 834          */
 835         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 836         if (ret != LDB_SUCCESS) {
 837                 ldb_oom(ldb);
 838                 talloc_free(ac);
 839                 return ret;
 840         }
 841
 842         /* build the replication meta_data */
 843         ZERO_STRUCT(nmd);
 844         nmd.version             = 1;
 845         nmd.ctr.ctr1.count      = msg->num_elements;
 846         nmd.ctr.ctr1.array      = talloc_array(msg,
 847                                                struct replPropertyMetaData1,
 848                                                nmd.ctr.ctr1.count);
 849         if (!nmd.ctr.ctr1.array) {
 850                 ldb_oom(ldb);
 851                 talloc_free(ac);
 852                 return LDB_ERR_OPERATIONS_ERROR;
 853         }
 854
 855         for (i=0; i < msg->num_elements; i++) {
 856                 struct ldb_message_element *e = &msg->elements[i];
 857                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 858                 const struct dsdb_attribute *sa;
 859
 860                 if (e->name[0] == '@') continue;
 861
 862                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 863                 if (!sa) {
 864                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 865                                       "replmd_add: attribute '%s' not defined in schema\n",
 866                                       e->name);
 867                         talloc_free(ac);
 868                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 869                 }
 870
 871                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 872                         /* if the attribute is not replicated (0x00000001)
 873                          * or constructed (0x00000004) it has no metadata
 874                          */
 875                         continue;
 876                 }
 877
 878 #if W2K3_LINKED_ATTRIBUTES
 879                 if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 880                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 881                         if (ret != LDB_SUCCESS) {
 882                                 talloc_free(ac);
 883                                 return ret;
 884                         }
 885                         /* linked attributes are not stored in
 886                            replPropertyMetaData in FL above w2k */
 887                         continue;
 888                 }
 889 #endif
 890
 891                 m->attid                        = sa->attributeID_id;
 892                 m->version                      = 1;
 893                 m->originating_change_time      = now;
 894                 m->originating_invocation_id    = *our_invocation_id;
 895                 m->originating_usn              = ac->seq_num;
 896                 m->local_usn                    = ac->seq_num;
 897                 ni++;
 898         }
 899
 900         /* fix meta data count */
 901         nmd.ctr.ctr1.count = ni;
 902
 903         /*
 904          * sort meta data array, and move the rdn attribute entry to the end
 905          */
 906         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 907         if (ret != LDB_SUCCESS) {
 908                 talloc_free(ac);
 909                 return ret;
 910         }
 911
 912         /* generated NDR encoded values */
 913         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 914                                        &nmd,
 915                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 916         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 917                 ldb_oom(ldb);
 918                 talloc_free(ac);
 919                 return LDB_ERR_OPERATIONS_ERROR;
 920         }
 921
 922         /*
 923          * add the autogenerated values
 924          */
 925         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 926         if (ret != LDB_SUCCESS) {
 927                 ldb_oom(ldb);
 928                 talloc_free(ac);
 929                 return ret;
 930         }
 931         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 932         if (ret != LDB_SUCCESS) {
 933                 ldb_oom(ldb);
 934                 talloc_free(ac);
 935                 return ret;
 936         }
 937         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 938         if (ret != LDB_SUCCESS) {
 939                 ldb_oom(ldb);
 940                 talloc_free(ac);
 941                 return ret;
 942         }
 943         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 944         if (ret != LDB_SUCCESS) {
 945                 ldb_oom(ldb);
 946                 talloc_free(ac);
 947                 return ret;
 948         }
 949         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 950         if (ret != LDB_SUCCESS) {
 951                 ldb_oom(ldb);
 952                 talloc_free(ac);
 953                 return ret;
 954         }
 955
 956         /*
 957          * sort the attributes by attid before storing the object
 958          */
 959         replmd_ldb_message_sort(msg, ac->schema);
 960
 961         objectclass_el = ldb_msg_find_element(msg, "objectClass");
 962         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
 963                                                         REPL_URGENT_ON_CREATE);
 964
 965         ac->is_urgent = is_urgent;
 966         ret = ldb_build_add_req(&down_req, ldb, ac,
 967                                 msg,
 968                                 req->controls,
 969                                 ac, replmd_op_callback,
 970                                 req);
 971
 972         if (ret != LDB_SUCCESS) {
 973                 talloc_free(ac);
 974                 return ret;
 975         }
 976
 977         /* mark the control done */
 978         if (control) {
 979                 control->critical = 0;
 980         }
 981
 982         /* go on with the call chain */
 983         return ldb_next_request(module, down_req);
 984 }
 985
 986
 987 /*
 988  * update the replPropertyMetaData for one element
 989  */
 990 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 991                                       struct ldb_message *msg,
 992                                       struct ldb_message_element *el,
 993                                       struct ldb_message_element *old_el,
 994                                       struct replPropertyMetaDataBlob *omd,
 995                                       const struct dsdb_schema *schema,
 996                                       uint64_t *seq_num,
 997                                       const struct GUID *our_invocation_id,
 998                                       NTTIME now)
 999 {
1000         uint32_t i;
1001         const struct dsdb_attribute *a;
1002         struct replPropertyMetaData1 *md1;
1003
1004         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1005         if (a == NULL) {
1006                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1007                          el->name));
1008                 return LDB_ERR_OPERATIONS_ERROR;
1009         }
1010
1011         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1012                 return LDB_SUCCESS;
1013         }
1014
1015         /* if the attribute's value haven't changed then return LDB_SUCCESS     */
1016         if (old_el != NULL && ldb_msg_element_compare(el, old_el) == 0) {
1017                 return LDB_SUCCESS;
1018         }
1019
1020         for (i=0; i<omd->ctr.ctr1.count; i++) {
1021                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1022         }
1023
1024 #if W2K3_LINKED_ATTRIBUTES
1025         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1026                 /* linked attributes are not stored in
1027                    replPropertyMetaData in FL above w2k, but we do
1028                    raise the seqnum for the object  */
1029                 if (*seq_num == 0 &&
1030                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1031                         return LDB_ERR_OPERATIONS_ERROR;
1032                 }
1033                 return LDB_SUCCESS;
1034         }
1035 #endif
1036
1037         if (i == omd->ctr.ctr1.count) {
1038                 /* we need to add a new one */
1039                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1040                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1041                 if (omd->ctr.ctr1.array == NULL) {
1042                         ldb_oom(ldb);
1043                         return LDB_ERR_OPERATIONS_ERROR;
1044                 }
1045                 omd->ctr.ctr1.count++;
1046                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1047         }
1048
1049         /* Get a new sequence number from the backend. We only do this
1050          * if we have a change that requires a new
1051          * replPropertyMetaData element
1052          */
1053         if (*seq_num == 0) {
1054                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1055                 if (ret != LDB_SUCCESS) {
1056                         return LDB_ERR_OPERATIONS_ERROR;
1057                 }
1058         }
1059
1060         md1 = &omd->ctr.ctr1.array[i];
1061         md1->version++;
1062         md1->attid                     = a->attributeID_id;
1063         md1->originating_change_time   = now;
1064         md1->originating_invocation_id = *our_invocation_id;
1065         md1->originating_usn           = *seq_num;
1066         md1->local_usn                 = *seq_num;
1067
1068         return LDB_SUCCESS;
1069 }
1070
1071 /*
1072  * update the replPropertyMetaData object each time we modify an
1073  * object. This is needed for DRS replication, as the merge on the
1074  * client is based on this object
1075  */
1076 static int replmd_update_rpmd(struct ldb_module *module,
1077                               const struct dsdb_schema *schema,
1078                               struct ldb_request *req,
1079                               struct ldb_message *msg, uint64_t *seq_num,
1080                               time_t t,
1081                               bool *is_urgent)
1082 {
1083         const struct ldb_val *omd_value;
1084         enum ndr_err_code ndr_err;
1085         struct replPropertyMetaDataBlob omd;
1086         unsigned int i;
1087         NTTIME now;
1088         const struct GUID *our_invocation_id;
1089         int ret;
1090         const char *attrs[] = { "replPropertyMetaData", "*", NULL };
1091         struct ldb_result *res;
1092         struct ldb_context *ldb;
1093         struct ldb_message_element *objectclass_el;
1094         enum urgent_situation situation;
1095         bool rodc;
1096
1097         ldb = ldb_module_get_ctx(module);
1098
1099         our_invocation_id = samdb_ntds_invocation_id(ldb);
1100         if (!our_invocation_id) {
1101                 /* this happens during an initial vampire while
1102                    updating the schema */
1103                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1104                 return LDB_SUCCESS;
1105         }
1106
1107         unix_to_nt_time(&now, t);
1108
1109         /* search for the existing replPropertyMetaDataBlob. We need
1110          * to use REVEAL and ask for DNs in storage format to support
1111          * the check for values being the same in
1112          * replmd_update_rpmd_element()
1113          */
1114         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
1115                                     DSDB_SEARCH_SHOW_DELETED |
1116                                     DSDB_SEARCH_SHOW_EXTENDED_DN |
1117                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1118                                     DSDB_SEARCH_REVEAL_INTERNALS);
1119         if (ret != LDB_SUCCESS || res->count != 1) {
1120                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1121                          ldb_dn_get_linearized(msg->dn)));
1122                 return LDB_ERR_OPERATIONS_ERROR;
1123         }
1124
1125         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1126          * otherwise we consider we are updating */
1127         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1128                 situation = REPL_URGENT_ON_DELETE;
1129         } else {
1130                 situation = REPL_URGENT_ON_UPDATE;
1131         }
1132
1133         objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1134         if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1135                                                         situation)) {
1136                 *is_urgent = true;
1137         }
1138
1139         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1140         if (!omd_value) {
1141                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1142                          ldb_dn_get_linearized(msg->dn)));
1143                 return LDB_ERR_OPERATIONS_ERROR;
1144         }
1145
1146         ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1147                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1148         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1149                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1150                          ldb_dn_get_linearized(msg->dn)));
1151                 return LDB_ERR_OPERATIONS_ERROR;
1152         }
1153
1154         if (omd.version != 1) {
1155                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1156                          omd.version, ldb_dn_get_linearized(msg->dn)));
1157                 return LDB_ERR_OPERATIONS_ERROR;
1158         }
1159
1160         /*we have elements that will be modified*/
1161         if (msg->num_elements > 0) {
1162                 /*if we are RODC and this is a DRSR update then its ok*/
1163                 if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
1164                         ret = samdb_rodc(ldb, &rodc);
1165                         if (ret != LDB_SUCCESS) {
1166                                 DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
1167                         } else if (rodc) {
1168                                 ldb_asprintf_errstring(ldb, "RODC modify is forbidden\n");
1169                                 return LDB_ERR_REFERRAL;
1170                         }
1171                 }
1172         }
1173
1174         for (i=0; i<msg->num_elements; i++) {
1175                 struct ldb_message_element *old_el;
1176                 old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1177                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1178                                                  our_invocation_id, now);
1179                 if (ret != LDB_SUCCESS) {
1180                         return ret;
1181                 }
1182
1183                 if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1184                         *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1185                 }
1186
1187         }
1188
1189         /*
1190          * replmd_update_rpmd_element has done an update if the
1191          * seq_num is set
1192          */
1193         if (*seq_num != 0) {
1194                 struct ldb_val *md_value;
1195                 struct ldb_message_element *el;
1196
1197                 md_value = talloc(msg, struct ldb_val);
1198                 if (md_value == NULL) {
1199                         ldb_oom(ldb);
1200                         return LDB_ERR_OPERATIONS_ERROR;
1201                 }
1202
1203                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1204                 if (ret != LDB_SUCCESS) {
1205                         return ret;
1206                 }
1207
1208                 ndr_err = ndr_push_struct_blob(md_value, msg, &omd,
1209                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1210                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1211                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1212                                  ldb_dn_get_linearized(msg->dn)));
1213                         return LDB_ERR_OPERATIONS_ERROR;
1214                 }
1215
1216                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1217                 if (ret != LDB_SUCCESS) {
1218                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1219                                  ldb_dn_get_linearized(msg->dn)));
1220                         return ret;
1221                 }
1222
1223                 el->num_values = 1;
1224                 el->values = md_value;
1225         }
1226
1227         return LDB_SUCCESS;
1228 }
1229
1230 struct parsed_dn {
1231         struct dsdb_dn *dsdb_dn;
1232         struct GUID *guid;
1233         struct ldb_val *v;
1234 };
1235
1236 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1237 {
1238         return GUID_compare(pdn1->guid, pdn2->guid);
1239 }
1240
1241 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1242 {
1243         struct parsed_dn *ret;
1244         if (dn && GUID_all_zero(guid)) {
1245                 /* when updating a link using DRS, we sometimes get a
1246                    NULL GUID. We then need to try and match by DN */
1247                 int i;
1248                 for (i=0; i<count; i++) {
1249                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1250                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1251                                 return &pdn[i];
1252                         }
1253                 }
1254                 return NULL;
1255         }
1256         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1257         return ret;
1258 }
1259
1260 /*
1261   get a series of message element values as an array of DNs and GUIDs
1262   the result is sorted by GUID
1263  */
1264 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1265                           struct ldb_message_element *el, struct parsed_dn **pdn,
1266                           const char *ldap_oid)
1267 {
1268         unsigned int i;
1269         struct ldb_context *ldb = ldb_module_get_ctx(module);
1270
1271         if (el == NULL) {
1272                 *pdn = NULL;
1273                 return LDB_SUCCESS;
1274         }
1275
1276         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1277         if (!*pdn) {
1278                 ldb_module_oom(module);
1279                 return LDB_ERR_OPERATIONS_ERROR;
1280         }
1281
1282         for (i=0; i<el->num_values; i++) {
1283                 struct ldb_val *v = &el->values[i];
1284                 NTSTATUS status;
1285                 struct ldb_dn *dn;
1286                 struct parsed_dn *p;
1287
1288                 p = &(*pdn)[i];
1289
1290                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1291                 if (p->dsdb_dn == NULL) {
1292                         return LDB_ERR_INVALID_DN_SYNTAX;
1293                 }
1294
1295                 dn = p->dsdb_dn->dn;
1296
1297                 p->guid = talloc(*pdn, struct GUID);
1298                 if (p->guid == NULL) {
1299                         ldb_module_oom(module);
1300                         return LDB_ERR_OPERATIONS_ERROR;
1301                 }
1302
1303                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1304                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1305                         /* we got a DN without a GUID - go find the GUID */
1306                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1307                         if (ret != LDB_SUCCESS) {
1308                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1309                                                        ldb_dn_get_linearized(dn));
1310                                 return ret;
1311                         }
1312                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1313                         if (ret != LDB_SUCCESS) {
1314                                 return ret;
1315                         }
1316                 } else if (!NT_STATUS_IS_OK(status)) {
1317                         return LDB_ERR_OPERATIONS_ERROR;
1318                 }
1319
1320                 /* keep a pointer to the original ldb_val */
1321                 p->v = v;
1322         }
1323
1324         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1325
1326         return LDB_SUCCESS;
1327 }
1328
1329 /*
1330   build a new extended DN, including all meta data fields
1331
1332   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1333   RMD_ADDTIME         = originating_add_time
1334   RMD_INVOCID         = originating_invocation_id
1335   RMD_CHANGETIME      = originating_change_time
1336   RMD_ORIGINATING_USN = originating_usn
1337   RMD_LOCAL_USN       = local_usn
1338   RMD_VERSION         = version
1339  */
1340 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1341                                const struct GUID *invocation_id, uint64_t seq_num,
1342                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1343 {
1344         struct ldb_dn *dn = dsdb_dn->dn;
1345         const char *tstring, *usn_string, *flags_string;
1346         struct ldb_val tval;
1347         struct ldb_val iid;
1348         struct ldb_val usnv, local_usnv;
1349         struct ldb_val vers, flagsv;
1350         NTSTATUS status;
1351         int ret;
1352         const char *dnstring;
1353         char *vstring;
1354         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1355
1356         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1357         if (!tstring) {
1358                 return LDB_ERR_OPERATIONS_ERROR;
1359         }
1360         tval = data_blob_string_const(tstring);
1361
1362         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1363         if (!usn_string) {
1364                 return LDB_ERR_OPERATIONS_ERROR;
1365         }
1366         usnv = data_blob_string_const(usn_string);
1367
1368         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1369         if (!usn_string) {
1370                 return LDB_ERR_OPERATIONS_ERROR;
1371         }
1372         local_usnv = data_blob_string_const(usn_string);
1373
1374         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1375         if (!vstring) {
1376                 return LDB_ERR_OPERATIONS_ERROR;
1377         }
1378         vers = data_blob_string_const(vstring);
1379
1380         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1381         if (!NT_STATUS_IS_OK(status)) {
1382                 return LDB_ERR_OPERATIONS_ERROR;
1383         }
1384
1385         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1386         if (!flags_string) {
1387                 return LDB_ERR_OPERATIONS_ERROR;
1388         }
1389         flagsv = data_blob_string_const(flags_string);
1390
1391         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1392         if (ret != LDB_SUCCESS) return ret;
1393         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1394         if (ret != LDB_SUCCESS) return ret;
1395         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1396         if (ret != LDB_SUCCESS) return ret;
1397         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1398         if (ret != LDB_SUCCESS) return ret;
1399         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1400         if (ret != LDB_SUCCESS) return ret;
1401         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1402         if (ret != LDB_SUCCESS) return ret;
1403         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1404         if (ret != LDB_SUCCESS) return ret;
1405
1406         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1407         if (dnstring == NULL) {
1408                 return LDB_ERR_OPERATIONS_ERROR;
1409         }
1410         *v = data_blob_string_const(dnstring);
1411
1412         return LDB_SUCCESS;
1413 }
1414
1415 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1416                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1417                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1418                                 uint32_t version, bool deleted);
1419
1420 /*
1421   check if any links need upgrading from w2k format
1422
1423   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.
1424  */
1425 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1426 {
1427         uint32_t i;
1428         for (i=0; i<count; i++) {
1429                 NTSTATUS status;
1430                 uint32_t version;
1431                 int ret;
1432
1433                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1434                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1435                         continue;
1436                 }
1437
1438                 /* it's an old one that needs upgrading */
1439                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1440                                            1, 1, 0, 0, false);
1441                 if (ret != LDB_SUCCESS) {
1442                         return ret;
1443                 }
1444         }
1445         return LDB_SUCCESS;
1446 }
1447
1448 /*
1449   update an extended DN, including all meta data fields
1450
1451   see replmd_build_la_val for value names
1452  */
1453 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1454                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1455                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1456                                 uint32_t version, bool deleted)
1457 {
1458         struct ldb_dn *dn = dsdb_dn->dn;
1459         const char *tstring, *usn_string, *flags_string;
1460         struct ldb_val tval;
1461         struct ldb_val iid;
1462         struct ldb_val usnv, local_usnv;
1463         struct ldb_val vers, flagsv;
1464         const struct ldb_val *old_addtime;
1465         uint32_t old_version;
1466         NTSTATUS status;
1467         int ret;
1468         const char *dnstring;
1469         char *vstring;
1470         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1471
1472         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1473         if (!tstring) {
1474                 return LDB_ERR_OPERATIONS_ERROR;
1475         }
1476         tval = data_blob_string_const(tstring);
1477
1478         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1479         if (!usn_string) {
1480                 return LDB_ERR_OPERATIONS_ERROR;
1481         }
1482         usnv = data_blob_string_const(usn_string);
1483
1484         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1485         if (!usn_string) {
1486                 return LDB_ERR_OPERATIONS_ERROR;
1487         }
1488         local_usnv = data_blob_string_const(usn_string);
1489
1490         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1491         if (!NT_STATUS_IS_OK(status)) {
1492                 return LDB_ERR_OPERATIONS_ERROR;
1493         }
1494
1495         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1496         if (!flags_string) {
1497                 return LDB_ERR_OPERATIONS_ERROR;
1498         }
1499         flagsv = data_blob_string_const(flags_string);
1500
1501         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1502         if (ret != LDB_SUCCESS) return ret;
1503
1504         /* get the ADDTIME from the original */
1505         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1506         if (old_addtime == NULL) {
1507                 old_addtime = &tval;
1508         }
1509         if (dsdb_dn != old_dsdb_dn) {
1510                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1511                 if (ret != LDB_SUCCESS) return ret;
1512         }
1513
1514         /* use our invocation id */
1515         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1516         if (ret != LDB_SUCCESS) return ret;
1517
1518         /* changetime is the current time */
1519         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1520         if (ret != LDB_SUCCESS) return ret;
1521
1522         /* update the USN */
1523         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1524         if (ret != LDB_SUCCESS) return ret;
1525
1526         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1527         if (ret != LDB_SUCCESS) return ret;
1528
1529         /* increase the version by 1 */
1530         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1531         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1532                 version = old_version+1;
1533         }
1534         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1535         vers = data_blob_string_const(vstring);
1536         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1537         if (ret != LDB_SUCCESS) return ret;
1538
1539         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1540         if (dnstring == NULL) {
1541                 return LDB_ERR_OPERATIONS_ERROR;
1542         }
1543         *v = data_blob_string_const(dnstring);
1544
1545         return LDB_SUCCESS;
1546 }
1547
1548 /*
1549   handle adding a linked attribute
1550  */
1551 static int replmd_modify_la_add(struct ldb_module *module,
1552                                 const struct dsdb_schema *schema,
1553                                 struct ldb_message *msg,
1554                                 struct ldb_message_element *el,
1555                                 struct ldb_message_element *old_el,
1556                                 const struct dsdb_attribute *schema_attr,
1557                                 uint64_t seq_num,
1558                                 time_t t,
1559                                 struct GUID *msg_guid)
1560 {
1561         unsigned int i;
1562         struct parsed_dn *dns, *old_dns;
1563         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1564         int ret;
1565         struct ldb_val *new_values = NULL;
1566         unsigned int num_new_values = 0;
1567         unsigned old_num_values = old_el?old_el->num_values:0;
1568         const struct GUID *invocation_id;
1569         struct ldb_context *ldb = ldb_module_get_ctx(module);
1570         NTTIME now;
1571
1572         unix_to_nt_time(&now, t);
1573
1574         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1575         if (ret != LDB_SUCCESS) {
1576                 talloc_free(tmp_ctx);
1577                 return ret;
1578         }
1579
1580         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1581         if (ret != LDB_SUCCESS) {
1582                 talloc_free(tmp_ctx);
1583                 return ret;
1584         }
1585
1586         invocation_id = samdb_ntds_invocation_id(ldb);
1587         if (!invocation_id) {
1588                 talloc_free(tmp_ctx);
1589                 return LDB_ERR_OPERATIONS_ERROR;
1590         }
1591
1592         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1593         if (ret != LDB_SUCCESS) {
1594                 talloc_free(tmp_ctx);
1595                 return ret;
1596         }
1597
1598         /* for each new value, see if it exists already with the same GUID */
1599         for (i=0; i<el->num_values; i++) {
1600                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1601                 if (p == NULL) {
1602                         /* this is a new linked attribute value */
1603                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1604                         if (new_values == NULL) {
1605                                 ldb_module_oom(module);
1606                                 talloc_free(tmp_ctx);
1607                                 return LDB_ERR_OPERATIONS_ERROR;
1608                         }
1609                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1610                                                   invocation_id, seq_num, seq_num, now, 0, false);
1611                         if (ret != LDB_SUCCESS) {
1612                                 talloc_free(tmp_ctx);
1613                                 return ret;
1614                         }
1615                         num_new_values++;
1616                 } else {
1617                         /* this is only allowed if the GUID was
1618                            previously deleted. */
1619                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1620
1621                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1622                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1623                                                        el->name, GUID_string(tmp_ctx, p->guid));
1624                                 talloc_free(tmp_ctx);
1625                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1626                         }
1627                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1628                                                    invocation_id, seq_num, seq_num, now, 0, false);
1629                         if (ret != LDB_SUCCESS) {
1630                                 talloc_free(tmp_ctx);
1631                                 return ret;
1632                         }
1633                 }
1634
1635                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1636                 if (ret != LDB_SUCCESS) {
1637                         talloc_free(tmp_ctx);
1638                         return ret;
1639                 }
1640         }
1641
1642         /* add the new ones on to the end of the old values, constructing a new el->values */
1643         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1644                                     struct ldb_val,
1645                                     old_num_values+num_new_values);
1646         if (el->values == NULL) {
1647                 ldb_module_oom(module);
1648                 return LDB_ERR_OPERATIONS_ERROR;
1649         }
1650
1651         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1652         el->num_values = old_num_values + num_new_values;
1653
1654         talloc_steal(msg->elements, el->values);
1655         talloc_steal(el->values, new_values);
1656
1657         talloc_free(tmp_ctx);
1658
1659         /* we now tell the backend to replace all existing values
1660            with the one we have constructed */
1661         el->flags = LDB_FLAG_MOD_REPLACE;
1662
1663         return LDB_SUCCESS;
1664 }
1665
1666
1667 /*
1668   handle deleting all active linked attributes
1669  */
1670 static int replmd_modify_la_delete(struct ldb_module *module,
1671                                    const struct dsdb_schema *schema,
1672                                    struct ldb_message *msg,
1673                                    struct ldb_message_element *el,
1674                                    struct ldb_message_element *old_el,
1675                                    const struct dsdb_attribute *schema_attr,
1676                                    uint64_t seq_num,
1677                                    time_t t,
1678                                    struct GUID *msg_guid)
1679 {
1680         unsigned int i;
1681         struct parsed_dn *dns, *old_dns;
1682         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1683         int ret;
1684         const struct GUID *invocation_id;
1685         struct ldb_context *ldb = ldb_module_get_ctx(module);
1686         NTTIME now;
1687
1688         unix_to_nt_time(&now, t);
1689
1690         /* check if there is nothing to delete */
1691         if ((!old_el || old_el->num_values == 0) &&
1692             el->num_values == 0) {
1693                 return LDB_SUCCESS;
1694         }
1695
1696         if (!old_el || old_el->num_values == 0) {
1697                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1698         }
1699
1700         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1701         if (ret != LDB_SUCCESS) {
1702                 talloc_free(tmp_ctx);
1703                 return ret;
1704         }
1705
1706         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1707         if (ret != LDB_SUCCESS) {
1708                 talloc_free(tmp_ctx);
1709                 return ret;
1710         }
1711
1712         invocation_id = samdb_ntds_invocation_id(ldb);
1713         if (!invocation_id) {
1714                 return LDB_ERR_OPERATIONS_ERROR;
1715         }
1716
1717         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
1718         if (ret != LDB_SUCCESS) {
1719                 talloc_free(tmp_ctx);
1720                 return ret;
1721         }
1722
1723         el->values = NULL;
1724
1725         /* see if we are being asked to delete any links that
1726            don't exist or are already deleted */
1727         for (i=0; i<el->num_values; i++) {
1728                 struct parsed_dn *p = &dns[i];
1729                 struct parsed_dn *p2;
1730                 uint32_t rmd_flags;
1731
1732                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1733                 if (!p2) {
1734                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1735                                                el->name, GUID_string(tmp_ctx, p->guid));
1736                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1737                 }
1738                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1739                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1740                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1741                                                el->name, GUID_string(tmp_ctx, p->guid));
1742                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1743                 }
1744         }
1745
1746         /* for each new value, see if it exists already with the same GUID
1747            if it is not already deleted and matches the delete list then delete it
1748         */
1749         for (i=0; i<old_el->num_values; i++) {
1750                 struct parsed_dn *p = &old_dns[i];
1751                 uint32_t rmd_flags;
1752
1753                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1754                         continue;
1755                 }
1756
1757                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1758                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1759
1760                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1761                                            invocation_id, seq_num, seq_num, now, 0, true);
1762                 if (ret != LDB_SUCCESS) {
1763                         talloc_free(tmp_ctx);
1764                         return ret;
1765                 }
1766
1767                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1768                 if (ret != LDB_SUCCESS) {
1769                         talloc_free(tmp_ctx);
1770                         return ret;
1771                 }
1772         }
1773
1774         el->values = talloc_steal(msg->elements, old_el->values);
1775         el->num_values = old_el->num_values;
1776
1777         talloc_free(tmp_ctx);
1778
1779         /* we now tell the backend to replace all existing values
1780            with the one we have constructed */
1781         el->flags = LDB_FLAG_MOD_REPLACE;
1782
1783         return LDB_SUCCESS;
1784 }
1785
1786 /*
1787   handle replacing a linked attribute
1788  */
1789 static int replmd_modify_la_replace(struct ldb_module *module,
1790                                     const struct dsdb_schema *schema,
1791                                     struct ldb_message *msg,
1792                                     struct ldb_message_element *el,
1793                                     struct ldb_message_element *old_el,
1794                                     const struct dsdb_attribute *schema_attr,
1795                                     uint64_t seq_num,
1796                                     time_t t,
1797                                     struct GUID *msg_guid)
1798 {
1799         unsigned int i;
1800         struct parsed_dn *dns, *old_dns;
1801         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1802         int ret;
1803         const struct GUID *invocation_id;
1804         struct ldb_context *ldb = ldb_module_get_ctx(module);
1805         struct ldb_val *new_values = NULL;
1806         unsigned int num_new_values = 0;
1807         unsigned int old_num_values = old_el?old_el->num_values:0;
1808         NTTIME now;
1809
1810         unix_to_nt_time(&now, t);
1811
1812         /* check if there is nothing to replace */
1813         if ((!old_el || old_el->num_values == 0) &&
1814             el->num_values == 0) {
1815                 return LDB_SUCCESS;
1816         }
1817
1818         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1819         if (ret != LDB_SUCCESS) {
1820                 talloc_free(tmp_ctx);
1821                 return ret;
1822         }
1823
1824         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1825         if (ret != LDB_SUCCESS) {
1826                 talloc_free(tmp_ctx);
1827                 return ret;
1828         }
1829
1830         invocation_id = samdb_ntds_invocation_id(ldb);
1831         if (!invocation_id) {
1832                 return LDB_ERR_OPERATIONS_ERROR;
1833         }
1834
1835         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1836         if (ret != LDB_SUCCESS) {
1837                 talloc_free(tmp_ctx);
1838                 return ret;
1839         }
1840
1841         /* mark all the old ones as deleted */
1842         for (i=0; i<old_num_values; i++) {
1843                 struct parsed_dn *old_p = &old_dns[i];
1844                 struct parsed_dn *p;
1845                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1846
1847                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1848
1849                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1850                 if (ret != LDB_SUCCESS) {
1851                         talloc_free(tmp_ctx);
1852                         return ret;
1853                 }
1854
1855                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1856                 if (p) {
1857                         /* we don't delete it if we are re-adding it */
1858                         continue;
1859                 }
1860
1861                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1862                                            invocation_id, seq_num, seq_num, now, 0, true);
1863                 if (ret != LDB_SUCCESS) {
1864                         talloc_free(tmp_ctx);
1865                         return ret;
1866                 }
1867         }
1868
1869         /* for each new value, either update its meta-data, or add it
1870          * to old_el
1871         */
1872         for (i=0; i<el->num_values; i++) {
1873                 struct parsed_dn *p = &dns[i], *old_p;
1874
1875                 if (old_dns &&
1876                     (old_p = parsed_dn_find(old_dns,
1877                                             old_num_values, p->guid, NULL)) != NULL) {
1878                         /* update in place */
1879                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1880                                                    old_p->dsdb_dn, invocation_id,
1881                                                    seq_num, seq_num, now, 0, false);
1882                         if (ret != LDB_SUCCESS) {
1883                                 talloc_free(tmp_ctx);
1884                                 return ret;
1885                         }
1886                 } else {
1887                         /* add a new one */
1888                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1889                                                     num_new_values+1);
1890                         if (new_values == NULL) {
1891                                 ldb_module_oom(module);
1892                                 talloc_free(tmp_ctx);
1893                                 return LDB_ERR_OPERATIONS_ERROR;
1894                         }
1895                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1896                                                   invocation_id, seq_num, seq_num, now, 0, false);
1897                         if (ret != LDB_SUCCESS) {
1898                                 talloc_free(tmp_ctx);
1899                                 return ret;
1900                         }
1901                         num_new_values++;
1902                 }
1903
1904                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1905                 if (ret != LDB_SUCCESS) {
1906                         talloc_free(tmp_ctx);
1907                         return ret;
1908                 }
1909         }
1910
1911         /* add the new values to the end of old_el */
1912         if (num_new_values != 0) {
1913                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1914                                             struct ldb_val, old_num_values+num_new_values);
1915                 if (el->values == NULL) {
1916                         ldb_module_oom(module);
1917                         return LDB_ERR_OPERATIONS_ERROR;
1918                 }
1919                 memcpy(&el->values[old_num_values], &new_values[0],
1920                        sizeof(struct ldb_val)*num_new_values);
1921                 el->num_values = old_num_values + num_new_values;
1922                 talloc_steal(msg->elements, new_values);
1923         } else {
1924                 el->values = old_el->values;
1925                 el->num_values = old_el->num_values;
1926                 talloc_steal(msg->elements, el->values);
1927         }
1928
1929         talloc_free(tmp_ctx);
1930
1931         /* we now tell the backend to replace all existing values
1932            with the one we have constructed */
1933         el->flags = LDB_FLAG_MOD_REPLACE;
1934
1935         return LDB_SUCCESS;
1936 }
1937
1938
1939 /*
1940   handle linked attributes in modify requests
1941  */
1942 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1943                                                struct ldb_message *msg,
1944                                                uint64_t seq_num, time_t t)
1945 {
1946         struct ldb_result *res;
1947         unsigned int i;
1948         int ret;
1949         struct ldb_context *ldb = ldb_module_get_ctx(module);
1950         struct ldb_message *old_msg;
1951
1952         const struct dsdb_schema *schema;
1953         struct GUID old_guid;
1954
1955         if (seq_num == 0) {
1956                 /* there the replmd_update_rpmd code has already
1957                  * checked and saw that there are no linked
1958                  * attributes */
1959                 return LDB_SUCCESS;
1960         }
1961
1962 #if !W2K3_LINKED_ATTRIBUTES
1963         return LDB_SUCCESS;
1964 #endif
1965
1966         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1967                 /* don't do anything special for linked attributes */
1968                 return LDB_SUCCESS;
1969         }
1970
1971         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1972                                     DSDB_SEARCH_SHOW_DELETED |
1973                                     DSDB_SEARCH_REVEAL_INTERNALS |
1974                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1975         if (ret != LDB_SUCCESS) {
1976                 return ret;
1977         }
1978         schema = dsdb_get_schema(ldb, res);
1979         if (!schema) {
1980                 return LDB_ERR_OPERATIONS_ERROR;
1981         }
1982
1983         old_msg = res->msgs[0];
1984
1985         old_guid = samdb_result_guid(old_msg, "objectGUID");
1986
1987         for (i=0; i<msg->num_elements; i++) {
1988                 struct ldb_message_element *el = &msg->elements[i];
1989                 struct ldb_message_element *old_el, *new_el;
1990                 const struct dsdb_attribute *schema_attr
1991                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1992                 if (!schema_attr) {
1993                         ldb_asprintf_errstring(ldb,
1994                                                "attribute %s is not a valid attribute in schema", el->name);
1995                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
1996                 }
1997                 if (schema_attr->linkID == 0) {
1998                         continue;
1999                 }
2000                 if ((schema_attr->linkID & 1) == 1) {
2001                         /* Odd is for the target.  Illegal to modify */
2002                         ldb_asprintf_errstring(ldb,
2003                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
2004                         return LDB_ERR_UNWILLING_TO_PERFORM;
2005                 }
2006                 old_el = ldb_msg_find_element(old_msg, el->name);
2007                 switch (el->flags & LDB_FLAG_MOD_MASK) {
2008                 case LDB_FLAG_MOD_REPLACE:
2009                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2010                         break;
2011                 case LDB_FLAG_MOD_DELETE:
2012                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2013                         break;
2014                 case LDB_FLAG_MOD_ADD:
2015                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2016                         break;
2017                 default:
2018                         ldb_asprintf_errstring(ldb,
2019                                                "invalid flags 0x%x for %s linked attribute",
2020                                                el->flags, el->name);
2021                         return LDB_ERR_UNWILLING_TO_PERFORM;
2022                 }
2023                 if (ret != LDB_SUCCESS) {
2024                         return ret;
2025                 }
2026                 if (old_el) {
2027                         ldb_msg_remove_attr(old_msg, el->name);
2028                 }
2029                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2030                 new_el->num_values = el->num_values;
2031                 new_el->values = talloc_steal(msg->elements, el->values);
2032
2033                 /* TODO: this relises a bit too heavily on the exact
2034                    behaviour of ldb_msg_find_element and
2035                    ldb_msg_remove_element */
2036                 old_el = ldb_msg_find_element(msg, el->name);
2037                 if (old_el != el) {
2038                         ldb_msg_remove_element(msg, old_el);
2039                         i--;
2040                 }
2041         }
2042
2043         talloc_free(res);
2044         return ret;
2045 }
2046
2047
2048
2049 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2050 {
2051         struct ldb_context *ldb;
2052         struct replmd_replicated_request *ac;
2053         struct ldb_request *down_req;
2054         struct ldb_message *msg;
2055         time_t t = time(NULL);
2056         int ret;
2057         bool is_urgent = false;
2058         struct loadparm_context *lp_ctx;
2059         char *referral;
2060
2061         /* do not manipulate our control entries */
2062         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2063                 return ldb_next_request(module, req);
2064         }
2065
2066         ldb = ldb_module_get_ctx(module);
2067         lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2068                                  struct loadparm_context);
2069
2070         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2071
2072         ac = replmd_ctx_init(module, req);
2073         if (!ac) {
2074                 return LDB_ERR_OPERATIONS_ERROR;
2075         }
2076
2077         /* we have to copy the message as the caller might have it as a const */
2078         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2079         if (msg == NULL) {
2080                 ldb_oom(ldb);
2081                 talloc_free(ac);
2082                 return LDB_ERR_OPERATIONS_ERROR;
2083         }
2084
2085         ldb_msg_remove_attr(msg, "whenChanged");
2086         ldb_msg_remove_attr(msg, "uSNChanged");
2087
2088         ret = replmd_update_rpmd(module, ac->schema, req, msg, &ac->seq_num, t, &is_urgent);
2089         if (ret == LDB_ERR_REFERRAL) {
2090                 talloc_free(ac);
2091
2092                 referral = talloc_asprintf(req,
2093                                            "ldap://%s/%s",
2094                                            lp_dnsdomain(lp_ctx),
2095                                            ldb_dn_get_linearized(msg->dn));
2096                 ret = ldb_module_send_referral(req, referral);
2097                 return ldb_module_done(req, NULL, NULL, ret);
2098         }
2099
2100         if (ret != LDB_SUCCESS) {
2101                 talloc_free(ac);
2102                 return ret;
2103         }
2104
2105         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
2106         if (ret != LDB_SUCCESS) {
2107                 talloc_free(ac);
2108                 return ret;
2109         }
2110
2111         /* TODO:
2112          * - replace the old object with the newly constructed one
2113          */
2114
2115         ac->is_urgent = is_urgent;
2116
2117         ret = ldb_build_mod_req(&down_req, ldb, ac,
2118                                 msg,
2119                                 req->controls,
2120                                 ac, replmd_op_callback,
2121                                 req);
2122         if (ret != LDB_SUCCESS) {
2123                 talloc_free(ac);
2124                 return ret;
2125         }
2126         talloc_steal(down_req, msg);
2127
2128         /* we only change whenChanged and uSNChanged if the seq_num
2129            has changed */
2130         if (ac->seq_num != 0) {
2131                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2132                         talloc_free(ac);
2133                         return ret;
2134                 }
2135
2136                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2137                         talloc_free(ac);
2138                         return ret;
2139                 }
2140         }
2141
2142         /* go on with the call chain */
2143         return ldb_next_request(module, down_req);
2144 }
2145
2146 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2147
2148 /*
2149   handle a rename request
2150
2151   On a rename we need to do an extra ldb_modify which sets the
2152   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2153  */
2154 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2155 {
2156         struct ldb_context *ldb;
2157         struct replmd_replicated_request *ac;
2158         int ret;
2159         struct ldb_request *down_req;
2160
2161         /* do not manipulate our control entries */
2162         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2163                 return ldb_next_request(module, req);
2164         }
2165
2166         ldb = ldb_module_get_ctx(module);
2167
2168         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2169
2170         ac = replmd_ctx_init(module, req);
2171         if (!ac) {
2172                 return LDB_ERR_OPERATIONS_ERROR;
2173         }
2174         ret = ldb_build_rename_req(&down_req, ldb, ac,
2175                                    ac->req->op.rename.olddn,
2176                                    ac->req->op.rename.newdn,
2177                                    ac->req->controls,
2178                                    ac, replmd_rename_callback,
2179                                    ac->req);
2180
2181         if (ret != LDB_SUCCESS) {
2182                 talloc_free(ac);
2183                 return ret;
2184         }
2185
2186         /* go on with the call chain */
2187         return ldb_next_request(module, down_req);
2188 }
2189
2190 /* After the rename is compleated, update the whenchanged etc */
2191 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2192 {
2193         struct ldb_context *ldb;
2194         struct replmd_replicated_request *ac;
2195         struct ldb_request *down_req;
2196         struct ldb_message *msg;
2197         time_t t = time(NULL);
2198         int ret;
2199
2200         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2201         ldb = ldb_module_get_ctx(ac->module);
2202
2203         if (ares->error != LDB_SUCCESS) {
2204                 return ldb_module_done(ac->req, ares->controls,
2205                                         ares->response, ares->error);
2206         }
2207
2208         if (ares->type != LDB_REPLY_DONE) {
2209                 ldb_set_errstring(ldb,
2210                                   "invalid ldb_reply_type in callback");
2211                 talloc_free(ares);
2212                 return ldb_module_done(ac->req, NULL, NULL,
2213                                         LDB_ERR_OPERATIONS_ERROR);
2214         }
2215
2216         /* Get a sequence number from the backend */
2217         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2218         if (ret != LDB_SUCCESS) {
2219                 return ret;
2220         }
2221
2222         /* TODO:
2223          * - replace the old object with the newly constructed one
2224          */
2225
2226         msg = ldb_msg_new(ac);
2227         if (msg == NULL) {
2228                 ldb_oom(ldb);
2229                 return LDB_ERR_OPERATIONS_ERROR;
2230         }
2231
2232         msg->dn = ac->req->op.rename.newdn;
2233
2234         ret = ldb_build_mod_req(&down_req, ldb, ac,
2235                                 msg,
2236                                 req->controls,
2237                                 ac, replmd_op_callback,
2238                                 req);
2239
2240         if (ret != LDB_SUCCESS) {
2241                 talloc_free(ac);
2242                 return ret;
2243         }
2244         talloc_steal(down_req, msg);
2245
2246         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2247                 talloc_free(ac);
2248                 return ret;
2249         }
2250
2251         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2252                 talloc_free(ac);
2253                 return ret;
2254         }
2255
2256         /* go on with the call chain - do the modify after the rename */
2257         return ldb_next_request(ac->module, down_req);
2258 }
2259
2260 /*
2261    remove links from objects that point at this object when an object
2262    is deleted
2263  */
2264 static int replmd_delete_remove_link(struct ldb_module *module,
2265                                      const struct dsdb_schema *schema,
2266                                      struct ldb_dn *dn,
2267                                      struct ldb_message_element *el,
2268                                      const struct dsdb_attribute *sa)
2269 {
2270         unsigned int i;
2271         TALLOC_CTX *tmp_ctx = talloc_new(module);
2272         struct ldb_context *ldb = ldb_module_get_ctx(module);
2273
2274         for (i=0; i<el->num_values; i++) {
2275                 struct dsdb_dn *dsdb_dn;
2276                 NTSTATUS status;
2277                 int ret;
2278                 struct GUID guid2;
2279                 struct ldb_message *msg;
2280                 const struct dsdb_attribute *target_attr;
2281                 struct ldb_message_element *el2;
2282                 struct ldb_val dn_val;
2283
2284                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2285                         continue;
2286                 }
2287
2288                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2289                 if (!dsdb_dn) {
2290                         talloc_free(tmp_ctx);
2291                         return LDB_ERR_OPERATIONS_ERROR;
2292                 }
2293
2294                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2295                 if (!NT_STATUS_IS_OK(status)) {
2296                         talloc_free(tmp_ctx);
2297                         return LDB_ERR_OPERATIONS_ERROR;
2298                 }
2299
2300                 /* remove the link */
2301                 msg = ldb_msg_new(tmp_ctx);
2302                 if (!msg) {
2303                         ldb_module_oom(module);
2304                         talloc_free(tmp_ctx);
2305                         return LDB_ERR_OPERATIONS_ERROR;
2306                 }
2307
2308
2309                 msg->dn = dsdb_dn->dn;
2310
2311                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2312                 if (target_attr == NULL) {
2313                         continue;
2314                 }
2315
2316                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2317                 if (ret != LDB_SUCCESS) {
2318                         ldb_module_oom(module);
2319                         talloc_free(tmp_ctx);
2320                         return LDB_ERR_OPERATIONS_ERROR;
2321                 }
2322                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2323                 el2->values = &dn_val;
2324                 el2->num_values = 1;
2325
2326                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2327                 if (ret != LDB_SUCCESS) {
2328                         talloc_free(tmp_ctx);
2329                         return ret;
2330                 }
2331         }
2332         talloc_free(tmp_ctx);
2333         return LDB_SUCCESS;
2334 }
2335
2336
2337 /*
2338   handle update of replication meta data for deletion of objects
2339
2340   This also handles the mapping of delete to a rename operation
2341   to allow deletes to be replicated.
2342  */
2343 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2344 {
2345         int ret = LDB_ERR_OTHER;
2346         bool retb;
2347         struct ldb_dn *old_dn, *new_dn;
2348         const char *rdn_name;
2349         const struct ldb_val *rdn_value, *new_rdn_value;
2350         struct GUID guid;
2351         struct ldb_context *ldb = ldb_module_get_ctx(module);
2352         const struct dsdb_schema *schema;
2353         struct ldb_message *msg, *old_msg;
2354         struct ldb_message_element *el;
2355         TALLOC_CTX *tmp_ctx;
2356         struct ldb_result *res, *parent_res;
2357         const char *preserved_attrs[] = {
2358                 /* yes, this really is a hard coded list. See MS-ADTS
2359                    section 3.1.1.5.5.1.1 */
2360                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2361                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2362                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2363                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2364                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2365                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2366                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2367                 "whenChanged", NULL};
2368         unsigned int i, el_count = 0;
2369         enum deletion_state { OBJECT_NOT_DELETED=1, OBJECT_DELETED=2, OBJECT_RECYCLED=3,
2370                                                 OBJECT_TOMBSTONE=4, OBJECT_REMOVED=5 };
2371         enum deletion_state deletion_state, next_deletion_state;
2372         bool enabled;
2373
2374         if (ldb_dn_is_special(req->op.del.dn)) {
2375                 return ldb_next_request(module, req);
2376         }
2377
2378         tmp_ctx = talloc_new(ldb);
2379         if (!tmp_ctx) {
2380                 ldb_oom(ldb);
2381                 return LDB_ERR_OPERATIONS_ERROR;
2382         }
2383
2384         schema = dsdb_get_schema(ldb, tmp_ctx);
2385         if (!schema) {
2386                 return LDB_ERR_OPERATIONS_ERROR;
2387         }
2388
2389         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2390
2391         /* we need the complete msg off disk, so we can work out which
2392            attributes need to be removed */
2393         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2394                                     DSDB_SEARCH_SHOW_DELETED |
2395                                     DSDB_SEARCH_REVEAL_INTERNALS |
2396                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2397         if (ret != LDB_SUCCESS) {
2398                 talloc_free(tmp_ctx);
2399                 return ret;
2400         }
2401         old_msg = res->msgs[0];
2402
2403
2404         ret = dsdb_recyclebin_enabled(module, &enabled);
2405         if (ret != LDB_SUCCESS) {
2406                 talloc_free(tmp_ctx);
2407                 return ret;
2408         }
2409
2410         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2411                 if (!enabled) {
2412                         deletion_state = OBJECT_TOMBSTONE;
2413                         next_deletion_state = OBJECT_REMOVED;
2414                 } else if (ldb_msg_check_string_attribute(old_msg, "isRecycled", "TRUE")) {
2415                         deletion_state = OBJECT_RECYCLED;
2416                         next_deletion_state = OBJECT_REMOVED;
2417                 } else {
2418                         deletion_state = OBJECT_DELETED;
2419                         next_deletion_state = OBJECT_RECYCLED;
2420                 }
2421         } else {
2422                 deletion_state = OBJECT_NOT_DELETED;
2423                 if (enabled) {
2424                         next_deletion_state = OBJECT_DELETED;
2425                 } else {
2426                         next_deletion_state = OBJECT_TOMBSTONE;
2427                 }
2428         }
2429
2430         if (next_deletion_state == OBJECT_REMOVED) {
2431                 struct auth_session_info *session_info =
2432                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2433                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2434                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2435                                         ldb_dn_get_linearized(old_msg->dn));
2436                         return LDB_ERR_UNWILLING_TO_PERFORM;
2437                 }
2438
2439                 /* it is already deleted - really remove it this time */
2440                 talloc_free(tmp_ctx);
2441                 return ldb_next_request(module, req);
2442         }
2443
2444         rdn_name = ldb_dn_get_rdn_name(old_dn);
2445         rdn_value = ldb_dn_get_rdn_val(old_dn);
2446
2447         msg = ldb_msg_new(tmp_ctx);
2448         if (msg == NULL) {
2449                 ldb_module_oom(module);
2450                 talloc_free(tmp_ctx);
2451                 return LDB_ERR_OPERATIONS_ERROR;
2452         }
2453
2454         msg->dn = old_dn;
2455
2456         if (deletion_state == OBJECT_NOT_DELETED){
2457                 /* work out where we will be renaming this object to */
2458                 ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2459                 if (ret != LDB_SUCCESS) {
2460                         /* this is probably an attempted delete on a partition
2461                          * that doesn't allow delete operations, such as the
2462                          * schema partition */
2463                         ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2464                                                    ldb_dn_get_linearized(old_dn));
2465                         talloc_free(tmp_ctx);
2466                         return LDB_ERR_UNWILLING_TO_PERFORM;
2467                 }
2468
2469                 /* get the objects GUID from the search we just did */
2470                 guid = samdb_result_guid(old_msg, "objectGUID");
2471
2472                 /* Add a formatted child */
2473                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2474                                                 rdn_name,
2475                                                 rdn_value->data,
2476                                                 GUID_string(tmp_ctx, &guid));
2477                 if (!retb) {
2478                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2479                                         ldb_dn_get_linearized(new_dn)));
2480                         talloc_free(tmp_ctx);
2481                         return LDB_ERR_OPERATIONS_ERROR;
2482                 }
2483
2484                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2485                 if (ret != LDB_SUCCESS) {
2486                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2487                         ldb_module_oom(module);
2488                         talloc_free(tmp_ctx);
2489                         return ret;
2490                 }
2491                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2492         }
2493
2494         /*
2495           now we need to modify the object in the following ways:
2496
2497           - add isDeleted=TRUE
2498           - update rDN and name, with new rDN
2499           - remove linked attributes
2500           - remove objectCategory and sAMAccountType
2501           - remove attribs not on the preserved list
2502              - preserved if in above list, or is rDN
2503           - remove all linked attribs from this object
2504           - remove all links from other objects to this object
2505           - add lastKnownParent
2506           - update replPropertyMetaData?
2507
2508           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2509          */
2510
2511         /* we need the storage form of the parent GUID */
2512         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2513                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2514                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2515                                     DSDB_SEARCH_REVEAL_INTERNALS|
2516                                     DSDB_SEARCH_SHOW_DELETED);
2517         if (ret != LDB_SUCCESS) {
2518                 talloc_free(tmp_ctx);
2519                 return ret;
2520         }
2521
2522         if (deletion_state == OBJECT_NOT_DELETED){
2523                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2524                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2525                 if (ret != LDB_SUCCESS) {
2526                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2527                         ldb_module_oom(module);
2528                         talloc_free(tmp_ctx);
2529                         return ret;
2530                 }
2531                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2532         }
2533
2534         switch (next_deletion_state){
2535
2536         case OBJECT_DELETED:
2537
2538                 ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
2539                 if (ret != LDB_SUCCESS) {
2540                         DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
2541                         ldb_module_oom(module);
2542                         talloc_free(tmp_ctx);
2543                         return ret;
2544                 }
2545                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2546
2547                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_DELETE, NULL);
2548                 if (ret != LDB_SUCCESS) {
2549                         talloc_free(tmp_ctx);
2550                         ldb_module_oom(module);
2551                         return ret;
2552                 }
2553
2554                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_DELETE, NULL);
2555                 if (ret != LDB_SUCCESS) {
2556                         talloc_free(tmp_ctx);
2557                         ldb_module_oom(module);
2558                         return ret;
2559                 }
2560
2561                 break;
2562
2563         case OBJECT_RECYCLED:
2564         case OBJECT_TOMBSTONE:
2565
2566                 /* we also mark it as recycled, meaning this object can't be
2567                    recovered (we are stripping its attributes) */
2568                 if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2569                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2570                         if (ret != LDB_SUCCESS) {
2571                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2572                                 ldb_module_oom(module);
2573                                 talloc_free(tmp_ctx);
2574                                 return ret;
2575                         }
2576                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2577                 }
2578
2579                 /* work out which of the old attributes we will be removing */
2580                 for (i=0; i<old_msg->num_elements; i++) {
2581                         const struct dsdb_attribute *sa;
2582                         el = &old_msg->elements[i];
2583                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2584                         if (!sa) {
2585                                 talloc_free(tmp_ctx);
2586                                 return LDB_ERR_OPERATIONS_ERROR;
2587                         }
2588                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2589                                 /* don't remove the rDN */
2590                                 continue;
2591                         }
2592                         if (sa->linkID && sa->linkID & 1) {
2593                                 ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2594                                 if (ret != LDB_SUCCESS) {
2595                                         talloc_free(tmp_ctx);
2596                                         return LDB_ERR_OPERATIONS_ERROR;
2597                                 }
2598                                 continue;
2599                         }
2600                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2601                                 continue;
2602                         }
2603                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2604                         if (ret != LDB_SUCCESS) {
2605                                 talloc_free(tmp_ctx);
2606                                 ldb_module_oom(module);
2607                                 return ret;
2608                         }
2609                 }
2610                 break;
2611
2612         default:
2613                 break;
2614         }
2615
2616         if (deletion_state == OBJECT_NOT_DELETED) {
2617                 /* work out what the new rdn value is, for updating the
2618                    rDN and name fields */
2619                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2620
2621                 ret = ldb_msg_add_value(msg, strlower_talloc(tmp_ctx, rdn_name), new_rdn_value, &el);
2622                 if (ret != LDB_SUCCESS) {
2623                         talloc_free(tmp_ctx);
2624                         return ret;
2625                 }
2626                 el->flags = LDB_FLAG_MOD_REPLACE;
2627
2628                 el = ldb_msg_find_element(old_msg, "name");
2629                 if (el) {
2630                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2631                         if (ret != LDB_SUCCESS) {
2632                                 talloc_free(tmp_ctx);
2633                                 return ret;
2634                         }
2635                         el->flags = LDB_FLAG_MOD_REPLACE;
2636                 }
2637         }
2638
2639         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2640         if (ret != LDB_SUCCESS) {
2641                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2642                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2643                 talloc_free(tmp_ctx);
2644                 return ret;
2645         }
2646
2647         if (deletion_state == OBJECT_NOT_DELETED) {
2648                 /* now rename onto the new DN */
2649                 ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2650                 if (ret != LDB_SUCCESS){
2651                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2652                                  ldb_dn_get_linearized(old_dn),
2653                                  ldb_dn_get_linearized(new_dn),
2654                                  ldb_errstring(ldb)));
2655                         talloc_free(tmp_ctx);
2656                         return ret;
2657                 }
2658         }
2659
2660         talloc_free(tmp_ctx);
2661
2662         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2663 }
2664
2665
2666
2667 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2668 {
2669         return ret;
2670 }
2671
2672 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2673 {
2674         int ret = LDB_ERR_OTHER;
2675         /* TODO: do some error mapping */
2676         return ret;
2677 }
2678
2679 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2680 {
2681         struct ldb_context *ldb;
2682         struct ldb_request *change_req;
2683         enum ndr_err_code ndr_err;
2684         struct ldb_message *msg;
2685         struct replPropertyMetaDataBlob *md;
2686         struct ldb_val md_value;
2687         unsigned int i;
2688         int ret;
2689
2690         /*
2691          * TODO: check if the parent object exist
2692          */
2693
2694         /*
2695          * TODO: handle the conflict case where an object with the
2696          *       same name exist
2697          */
2698
2699         ldb = ldb_module_get_ctx(ar->module);
2700         msg = ar->objs->objects[ar->index_current].msg;
2701         md = ar->objs->objects[ar->index_current].meta_data;
2702
2703         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2704         if (ret != LDB_SUCCESS) {
2705                 return replmd_replicated_request_error(ar, ret);
2706         }
2707
2708         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2709         if (ret != LDB_SUCCESS) {
2710                 return replmd_replicated_request_error(ar, ret);
2711         }
2712
2713         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2714         if (ret != LDB_SUCCESS) {
2715                 return replmd_replicated_request_error(ar, ret);
2716         }
2717
2718         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2719         if (ret != LDB_SUCCESS) {
2720                 return replmd_replicated_request_error(ar, ret);
2721         }
2722
2723         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2724         if (ret != LDB_SUCCESS) {
2725                 return replmd_replicated_request_error(ar, ret);
2726         }
2727
2728         /* remove any message elements that have zero values */
2729         for (i=0; i<msg->num_elements; i++) {
2730                 struct ldb_message_element *el = &msg->elements[i];
2731
2732                 if (el->num_values == 0) {
2733                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2734                                  el->name));
2735                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2736                         msg->num_elements--;
2737                         i--;
2738                         continue;
2739                 }
2740         }
2741
2742         /*
2743          * the meta data array is already sorted by the caller
2744          */
2745         for (i=0; i < md->ctr.ctr1.count; i++) {
2746                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2747         }
2748         ndr_err = ndr_push_struct_blob(&md_value, msg, md,
2749                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2750         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2751                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2752                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2753         }
2754         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2755         if (ret != LDB_SUCCESS) {
2756                 return replmd_replicated_request_error(ar, ret);
2757         }
2758
2759         replmd_ldb_message_sort(msg, ar->schema);
2760
2761         if (DEBUGLVL(4)) {
2762                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2763                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2764                 talloc_free(s);
2765         }
2766
2767         ret = ldb_build_add_req(&change_req,
2768                                 ldb,
2769                                 ar,
2770                                 msg,
2771                                 ar->controls,
2772                                 ar,
2773                                 replmd_op_callback,
2774                                 ar->req);
2775         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2776
2777         return ldb_next_request(ar->module, change_req);
2778 }
2779
2780 /*
2781    return true if an update is newer than an existing entry
2782    see section 5.11 of MS-ADTS
2783 */
2784 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2785                                    const struct GUID *update_invocation_id,
2786                                    uint32_t current_version,
2787                                    uint32_t update_version,
2788                                    NTTIME current_change_time,
2789                                    NTTIME update_change_time)
2790 {
2791         if (update_version != current_version) {
2792                 return update_version > current_version;
2793         }
2794         if (update_change_time > current_change_time) {
2795                 return true;
2796         }
2797         if (update_change_time == current_change_time) {
2798                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2799         }
2800         return false;
2801 }
2802
2803 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2804                                                   struct replPropertyMetaData1 *new_m)
2805 {
2806         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2807                                       &new_m->originating_invocation_id,
2808                                       cur_m->version,
2809                                       new_m->version,
2810                                       cur_m->originating_change_time,
2811                                       new_m->originating_change_time);
2812 }
2813
2814 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2815 {
2816         struct ldb_context *ldb;
2817         struct ldb_request *change_req;
2818         enum ndr_err_code ndr_err;
2819         struct ldb_message *msg;
2820         struct replPropertyMetaDataBlob *rmd;
2821         struct replPropertyMetaDataBlob omd;
2822         const struct ldb_val *omd_value;
2823         struct replPropertyMetaDataBlob nmd;
2824         struct ldb_val nmd_value;
2825         unsigned int i;
2826         uint32_t j,ni=0;
2827         unsigned int removed_attrs = 0;
2828         int ret;
2829
2830         ldb = ldb_module_get_ctx(ar->module);
2831         msg = ar->objs->objects[ar->index_current].msg;
2832         rmd = ar->objs->objects[ar->index_current].meta_data;
2833         ZERO_STRUCT(omd);
2834         omd.version = 1;
2835
2836         /*
2837          * TODO: check repl data is correct after a rename
2838          */
2839         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2840                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2841                           ldb_dn_get_linearized(ar->search_msg->dn),
2842                           ldb_dn_get_linearized(msg->dn));
2843                 if (dsdb_module_rename(ar->module,
2844                                        ar->search_msg->dn, msg->dn,
2845                                        DSDB_FLAG_OWN_MODULE) != LDB_SUCCESS) {
2846                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2847                                   ldb_dn_get_linearized(ar->search_msg->dn),
2848                                   ldb_dn_get_linearized(msg->dn),
2849                                   ldb_errstring(ldb));
2850                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2851                 }
2852         }
2853
2854         /* find existing meta data */
2855         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2856         if (omd_value) {
2857                 ndr_err = ndr_pull_struct_blob(omd_value, ar, &omd,
2858                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2859                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2860                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2861                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2862                 }
2863
2864                 if (omd.version != 1) {
2865                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2866                 }
2867         }
2868
2869         ZERO_STRUCT(nmd);
2870         nmd.version = 1;
2871         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2872         nmd.ctr.ctr1.array = talloc_array(ar,
2873                                           struct replPropertyMetaData1,
2874                                           nmd.ctr.ctr1.count);
2875         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2876
2877         /* first copy the old meta data */
2878         for (i=0; i < omd.ctr.ctr1.count; i++) {
2879                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2880                 ni++;
2881         }
2882
2883         /* now merge in the new meta data */
2884         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2885                 bool found = false;
2886
2887                 for (j=0; j < ni; j++) {
2888                         bool cmp;
2889
2890                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2891                                 continue;
2892                         }
2893
2894                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2895                                                                     &rmd->ctr.ctr1.array[i]);
2896                         if (cmp) {
2897                                 /* replace the entry */
2898                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2899                                 found = true;
2900                                 break;
2901                         }
2902
2903                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
2904                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
2905                                          msg->elements[i-removed_attrs].name,
2906                                          ldb_dn_get_linearized(msg->dn),
2907                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2908                         }
2909
2910                         /* we don't want to apply this change so remove the attribute */
2911                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2912                         removed_attrs++;
2913
2914                         found = true;
2915                         break;
2916                 }
2917
2918                 if (found) continue;
2919
2920                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2921                 ni++;
2922         }
2923
2924         /*
2925          * finally correct the size of the meta_data array
2926          */
2927         nmd.ctr.ctr1.count = ni;
2928
2929         /*
2930          * the rdn attribute (the alias for the name attribute),
2931          * 'cn' for most objects is the last entry in the meta data array
2932          * we have stored
2933          *
2934          * sort the new meta data array
2935          */
2936         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2937         if (ret != LDB_SUCCESS) {
2938                 return ret;
2939         }
2940
2941         /*
2942          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2943          */
2944         if (msg->num_elements == 0) {
2945                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2946                           ar->index_current);
2947
2948                 ar->index_current++;
2949                 return replmd_replicated_apply_next(ar);
2950         }
2951
2952         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2953                   ar->index_current, msg->num_elements);
2954
2955         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2956         if (ret != LDB_SUCCESS) {
2957                 return replmd_replicated_request_error(ar, ret);
2958         }
2959
2960         for (i=0; i<ni; i++) {
2961                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2962         }
2963
2964         /* create the meta data value */
2965         ndr_err = ndr_push_struct_blob(&nmd_value, msg, &nmd,
2966                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2967         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2968                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2969                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2970         }
2971
2972         /*
2973          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2974          * and replPopertyMetaData attributes
2975          */
2976         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2977         if (ret != LDB_SUCCESS) {
2978                 return replmd_replicated_request_error(ar, ret);
2979         }
2980         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2981         if (ret != LDB_SUCCESS) {
2982                 return replmd_replicated_request_error(ar, ret);
2983         }
2984         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2985         if (ret != LDB_SUCCESS) {
2986                 return replmd_replicated_request_error(ar, ret);
2987         }
2988
2989         replmd_ldb_message_sort(msg, ar->schema);
2990
2991         /* we want to replace the old values */
2992         for (i=0; i < msg->num_elements; i++) {
2993                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
2994         }
2995
2996         if (DEBUGLVL(4)) {
2997                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
2998                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
2999                 talloc_free(s);
3000         }
3001
3002         ret = ldb_build_mod_req(&change_req,
3003                                 ldb,
3004                                 ar,
3005                                 msg,
3006                                 ar->controls,
3007                                 ar,
3008                                 replmd_op_callback,
3009                                 ar->req);
3010         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3011
3012         return ldb_next_request(ar->module, change_req);
3013 }
3014
3015 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
3016                                                    struct ldb_reply *ares)
3017 {
3018         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3019                                                struct replmd_replicated_request);
3020         int ret;
3021
3022         if (!ares) {
3023                 return ldb_module_done(ar->req, NULL, NULL,
3024                                         LDB_ERR_OPERATIONS_ERROR);
3025         }
3026         if (ares->error != LDB_SUCCESS &&
3027             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3028                 return ldb_module_done(ar->req, ares->controls,
3029                                         ares->response, ares->error);
3030         }
3031
3032         switch (ares->type) {
3033         case LDB_REPLY_ENTRY:
3034                 ar->search_msg = talloc_steal(ar, ares->message);
3035                 break;
3036
3037         case LDB_REPLY_REFERRAL:
3038                 /* we ignore referrals */
3039                 break;
3040
3041         case LDB_REPLY_DONE:
3042                 if (ar->search_msg != NULL) {
3043                         ret = replmd_replicated_apply_merge(ar);
3044                 } else {
3045                         ret = replmd_replicated_apply_add(ar);
3046                 }
3047                 if (ret != LDB_SUCCESS) {
3048                         return ldb_module_done(ar->req, NULL, NULL, ret);
3049                 }
3050         }
3051
3052         talloc_free(ares);
3053         return LDB_SUCCESS;
3054 }
3055
3056 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
3057
3058 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
3059 {
3060         struct ldb_context *ldb;
3061         int ret;
3062         char *tmp_str;
3063         char *filter;
3064         struct ldb_request *search_req;
3065         struct ldb_search_options_control *options;
3066
3067         if (ar->index_current >= ar->objs->num_objects) {
3068                 /* done with it, go to next stage */
3069                 return replmd_replicated_uptodate_vector(ar);
3070         }
3071
3072         ldb = ldb_module_get_ctx(ar->module);
3073         ar->search_msg = NULL;
3074
3075         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
3076         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3077
3078         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
3079         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3080         talloc_free(tmp_str);
3081
3082         ret = ldb_build_search_req(&search_req,
3083                                    ldb,
3084                                    ar,
3085                                    NULL,
3086                                    LDB_SCOPE_SUBTREE,
3087                                    filter,
3088                                    NULL,
3089                                    NULL,
3090                                    ar,
3091                                    replmd_replicated_apply_search_callback,
3092                                    ar->req);
3093
3094         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
3095         if (ret != LDB_SUCCESS) {
3096                 return ret;
3097         }
3098
3099         /* we need to cope with cross-partition links, so search for
3100            the GUID over all partitions */
3101         options = talloc(search_req, struct ldb_search_options_control);
3102         if (options == NULL) {
3103                 DEBUG(0, (__location__ ": out of memory\n"));
3104                 return LDB_ERR_OPERATIONS_ERROR;
3105         }
3106         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
3107
3108         ret = ldb_request_add_control(search_req,
3109                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
3110                                       true, options);
3111         if (ret != LDB_SUCCESS) {
3112                 return ret;
3113         }
3114
3115         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3116
3117         return ldb_next_request(ar->module, search_req);
3118 }
3119
3120 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
3121                                                       struct ldb_reply *ares)
3122 {
3123         struct ldb_context *ldb;
3124         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3125                                                struct replmd_replicated_request);
3126         ldb = ldb_module_get_ctx(ar->module);
3127
3128         if (!ares) {
3129                 return ldb_module_done(ar->req, NULL, NULL,
3130                                         LDB_ERR_OPERATIONS_ERROR);
3131         }
3132         if (ares->error != LDB_SUCCESS) {
3133                 return ldb_module_done(ar->req, ares->controls,
3134                                         ares->response, ares->error);
3135         }
3136
3137         if (ares->type != LDB_REPLY_DONE) {
3138                 ldb_set_errstring(ldb, "Invalid reply type\n!");
3139                 return ldb_module_done(ar->req, NULL, NULL,
3140                                         LDB_ERR_OPERATIONS_ERROR);
3141         }
3142
3143         talloc_free(ares);
3144
3145         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3146 }
3147
3148 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3149 {
3150         struct ldb_context *ldb;
3151         struct ldb_request *change_req;
3152         enum ndr_err_code ndr_err;
3153         struct ldb_message *msg;
3154         struct replUpToDateVectorBlob ouv;
3155         const struct ldb_val *ouv_value;
3156         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3157         struct replUpToDateVectorBlob nuv;
3158         struct ldb_val nuv_value;
3159         struct ldb_message_element *nuv_el = NULL;
3160         const struct GUID *our_invocation_id;
3161         struct ldb_message_element *orf_el = NULL;
3162         struct repsFromToBlob nrf;
3163         struct ldb_val *nrf_value = NULL;
3164         struct ldb_message_element *nrf_el = NULL;
3165         unsigned int i;
3166         uint32_t j,ni=0;
3167         bool found = false;
3168         time_t t = time(NULL);
3169         NTTIME now;
3170         int ret;
3171
3172         ldb = ldb_module_get_ctx(ar->module);
3173         ruv = ar->objs->uptodateness_vector;
3174         ZERO_STRUCT(ouv);
3175         ouv.version = 2;
3176         ZERO_STRUCT(nuv);
3177         nuv.version = 2;
3178
3179         unix_to_nt_time(&now, t);
3180
3181         /*
3182          * first create the new replUpToDateVector
3183          */
3184         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3185         if (ouv_value) {
3186                 ndr_err = ndr_pull_struct_blob(ouv_value, ar, &ouv,
3187                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3188                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3189                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3190                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3191                 }
3192
3193                 if (ouv.version != 2) {
3194                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3195                 }
3196         }
3197
3198         /*
3199          * the new uptodateness vector will at least
3200          * contain 1 entry, one for the source_dsa
3201          *
3202          * plus optional values from our old vector and the one from the source_dsa
3203          */
3204         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3205         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3206         nuv.ctr.ctr2.cursors = talloc_array(ar,
3207                                             struct drsuapi_DsReplicaCursor2,
3208                                             nuv.ctr.ctr2.count);
3209         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3210
3211         /* first copy the old vector */
3212         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3213                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3214                 ni++;
3215         }
3216
3217         /* get our invocation_id if we have one already attached to the ldb */
3218         our_invocation_id = samdb_ntds_invocation_id(ldb);
3219
3220         /* merge in the source_dsa vector is available */
3221         for (i=0; (ruv && i < ruv->count); i++) {
3222                 found = false;
3223
3224                 if (our_invocation_id &&
3225                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3226                                our_invocation_id)) {
3227                         continue;
3228                 }
3229
3230                 for (j=0; j < ni; j++) {
3231                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3232                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3233                                 continue;
3234                         }
3235
3236                         found = true;
3237
3238                         /*
3239                          * we update only the highest_usn and not the latest_sync_success time,
3240                          * because the last success stands for direct replication
3241                          */
3242                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3243                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3244                         }
3245                         break;
3246                 }
3247
3248                 if (found) continue;
3249
3250                 /* if it's not there yet, add it */
3251                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3252                 ni++;
3253         }
3254
3255         /*
3256          * merge in the current highwatermark for the source_dsa
3257          */
3258         found = false;
3259         for (j=0; j < ni; j++) {
3260                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3261                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3262                         continue;
3263                 }
3264
3265                 found = true;
3266
3267                 /*
3268                  * here we update the highest_usn and last_sync_success time
3269                  * because we're directly replicating from the source_dsa
3270                  *
3271                  * and use the tmp_highest_usn because this is what we have just applied
3272                  * to our ldb
3273                  */
3274                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3275                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3276                 break;
3277         }
3278         if (!found) {
3279                 /*
3280                  * here we update the highest_usn and last_sync_success time
3281                  * because we're directly replicating from the source_dsa
3282                  *
3283                  * and use the tmp_highest_usn because this is what we have just applied
3284                  * to our ldb
3285                  */
3286                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3287                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3288                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3289                 ni++;
3290         }
3291
3292         /*
3293          * finally correct the size of the cursors array
3294          */
3295         nuv.ctr.ctr2.count = ni;
3296
3297         /*
3298          * sort the cursors
3299          */
3300         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
3301
3302         /*
3303          * create the change ldb_message
3304          */
3305         msg = ldb_msg_new(ar);
3306         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3307         msg->dn = ar->search_msg->dn;
3308
3309         ndr_err = ndr_push_struct_blob(&nuv_value, msg, &nuv,
3310                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3311         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3312                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3313                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3314         }
3315         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3316         if (ret != LDB_SUCCESS) {
3317                 return replmd_replicated_request_error(ar, ret);
3318         }
3319         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3320
3321         /*
3322          * now create the new repsFrom value from the given repsFromTo1 structure
3323          */
3324         ZERO_STRUCT(nrf);
3325         nrf.version                                     = 1;
3326         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3327         /* and fix some values... */
3328         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3329         nrf.ctr.ctr1.last_success                       = now;
3330         nrf.ctr.ctr1.last_attempt                       = now;
3331         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3332         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3333
3334         /*
3335          * first see if we already have a repsFrom value for the current source dsa
3336          * if so we'll later replace this value
3337          */
3338         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3339         if (orf_el) {
3340                 for (i=0; i < orf_el->num_values; i++) {
3341                         struct repsFromToBlob *trf;
3342
3343                         trf = talloc(ar, struct repsFromToBlob);
3344                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3345
3346                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, trf,
3347                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3348                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3349                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3350                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3351                         }
3352
3353                         if (trf->version != 1) {
3354                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3355                         }
3356
3357                         /*
3358                          * we compare the source dsa objectGUID not the invocation_id
3359                          * because we want only one repsFrom value per source dsa
3360                          * and when the invocation_id of the source dsa has changed we don't need
3361                          * the old repsFrom with the old invocation_id
3362                          */
3363                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3364                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3365                                 talloc_free(trf);
3366                                 continue;
3367                         }
3368
3369                         talloc_free(trf);
3370                         nrf_value = &orf_el->values[i];
3371                         break;
3372                 }
3373
3374                 /*
3375                  * copy over all old values to the new ldb_message
3376                  */
3377                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3378                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3379                 *nrf_el = *orf_el;
3380         }
3381
3382         /*
3383          * if we haven't found an old repsFrom value for the current source dsa
3384          * we'll add a new value
3385          */
3386         if (!nrf_value) {
3387                 struct ldb_val zero_value;
3388                 ZERO_STRUCT(zero_value);
3389                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3390                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3391
3392                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3393         }
3394
3395         /* we now fill the value which is already attached to ldb_message */
3396         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3397                                        &nrf,
3398                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3399         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3400                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3401                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3402         }
3403
3404         /*
3405          * the ldb_message_element for the attribute, has all the old values and the new one
3406          * so we'll replace the whole attribute with all values
3407          */
3408         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3409
3410         if (DEBUGLVL(4)) {
3411                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3412                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3413                 talloc_free(s);
3414         }
3415
3416         /* prepare the ldb_modify() request */
3417         ret = ldb_build_mod_req(&change_req,
3418                                 ldb,
3419                                 ar,
3420                                 msg,
3421                                 ar->controls,
3422                                 ar,
3423                                 replmd_replicated_uptodate_modify_callback,
3424                                 ar->req);
3425         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3426
3427         return ldb_next_request(ar->module, change_req);
3428 }
3429
3430 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3431                                                       struct ldb_reply *ares)
3432 {
3433         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3434                                                struct replmd_replicated_request);
3435         int ret;
3436
3437         if (!ares) {
3438                 return ldb_module_done(ar->req, NULL, NULL,
3439                                         LDB_ERR_OPERATIONS_ERROR);
3440         }
3441         if (ares->error != LDB_SUCCESS &&
3442             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3443                 return ldb_module_done(ar->req, ares->controls,
3444                                         ares->response, ares->error);
3445         }
3446
3447         switch (ares->type) {
3448         case LDB_REPLY_ENTRY:
3449                 ar->search_msg = talloc_steal(ar, ares->message);
3450                 break;
3451
3452         case LDB_REPLY_REFERRAL:
3453                 /* we ignore referrals */
3454                 break;
3455
3456         case LDB_REPLY_DONE:
3457                 if (ar->search_msg == NULL) {
3458                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3459                 } else {
3460                         ret = replmd_replicated_uptodate_modify(ar);
3461                 }
3462                 if (ret != LDB_SUCCESS) {
3463                         return ldb_module_done(ar->req, NULL, NULL, ret);
3464                 }
3465         }
3466
3467         talloc_free(ares);
3468         return LDB_SUCCESS;
3469 }
3470
3471
3472 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3473 {
3474         struct ldb_context *ldb;
3475         int ret;
3476         static const char *attrs[] = {
3477                 "replUpToDateVector",
3478                 "repsFrom",
3479                 NULL
3480         };
3481         struct ldb_request *search_req;
3482
3483         ldb = ldb_module_get_ctx(ar->module);
3484         ar->search_msg = NULL;
3485
3486         ret = ldb_build_search_req(&search_req,
3487                                    ldb,
3488                                    ar,
3489                                    ar->objs->partition_dn,
3490                                    LDB_SCOPE_BASE,
3491                                    "(objectClass=*)",
3492                                    attrs,
3493                                    NULL,
3494                                    ar,
3495                                    replmd_replicated_uptodate_search_callback,
3496                                    ar->req);
3497         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3498
3499         return ldb_next_request(ar->module, search_req);
3500 }
3501
3502
3503
3504 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3505 {
3506         struct ldb_context *ldb;
3507         struct dsdb_extended_replicated_objects *objs;
3508         struct replmd_replicated_request *ar;
3509         struct ldb_control **ctrls;
3510         int ret;
3511         uint32_t i;
3512         struct replmd_private *replmd_private =
3513                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3514
3515         ldb = ldb_module_get_ctx(module);
3516
3517         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3518
3519         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3520         if (!objs) {
3521                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3522                 return LDB_ERR_PROTOCOL_ERROR;
3523         }
3524
3525         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3526                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3527                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3528                 return LDB_ERR_PROTOCOL_ERROR;
3529         }
3530
3531         ar = replmd_ctx_init(module, req);
3532         if (!ar)
3533                 return LDB_ERR_OPERATIONS_ERROR;
3534
3535         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3536         ar->apply_mode = true;
3537         ar->objs = objs;
3538         ar->schema = dsdb_get_schema(ldb, ar);
3539         if (!ar->schema) {
3540                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3541                 talloc_free(ar);
3542                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3543                 return LDB_ERR_CONSTRAINT_VIOLATION;
3544         }
3545
3546         ctrls = req->controls;
3547
3548         if (req->controls) {
3549                 req->controls = talloc_memdup(ar, req->controls,
3550                                               talloc_get_size(req->controls));
3551                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3552         }
3553
3554         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3555         if (ret != LDB_SUCCESS) {
3556                 return ret;
3557         }
3558
3559         ar->controls = req->controls;
3560         req->controls = ctrls;
3561
3562         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3563
3564         /* save away the linked attributes for the end of the
3565            transaction */
3566         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3567                 struct la_entry *la_entry;
3568
3569                 if (replmd_private->la_ctx == NULL) {
3570                         replmd_private->la_ctx = talloc_new(replmd_private);
3571                 }
3572                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3573                 if (la_entry == NULL) {
3574                         ldb_oom(ldb);
3575                         return LDB_ERR_OPERATIONS_ERROR;
3576                 }
3577                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3578                 if (la_entry->la == NULL) {
3579                         talloc_free(la_entry);
3580                         ldb_oom(ldb);
3581                         return LDB_ERR_OPERATIONS_ERROR;
3582                 }
3583                 *la_entry->la = ar->objs->linked_attributes[i];
3584
3585                 /* we need to steal the non-scalars so they stay
3586                    around until the end of the transaction */
3587                 talloc_steal(la_entry->la, la_entry->la->identifier);
3588                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3589
3590                 DLIST_ADD(replmd_private->la_list, la_entry);
3591         }
3592
3593         return replmd_replicated_apply_next(ar);
3594 }
3595
3596 /*
3597   process one linked attribute structure
3598  */
3599 static int replmd_process_linked_attribute(struct ldb_module *module,
3600                                            struct la_entry *la_entry)
3601 {
3602         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3603         struct ldb_context *ldb = ldb_module_get_ctx(module);
3604         struct ldb_message *msg;
3605         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3606         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
3607         int ret;
3608         const struct dsdb_attribute *attr;
3609         struct dsdb_dn *dsdb_dn;
3610         uint64_t seq_num = 0;
3611         struct ldb_message_element *old_el;
3612         WERROR status;
3613         time_t t = time(NULL);
3614         struct ldb_result *res;
3615         const char *attrs[2];
3616         struct parsed_dn *pdn_list, *pdn;
3617         struct GUID guid = GUID_zero();
3618         NTSTATUS ntstatus;
3619         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3620         const struct GUID *our_invocation_id;
3621
3622 /*
3623 linked_attributes[0]:
3624      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3625         identifier               : *
3626             identifier: struct drsuapi_DsReplicaObjectIdentifier
3627                 __ndr_size               : 0x0000003a (58)
3628                 __ndr_size_sid           : 0x00000000 (0)
3629                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3630                 sid                      : S-0-0
3631                 __ndr_size_dn            : 0x00000000 (0)
3632                 dn                       : ''
3633         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3634         value: struct drsuapi_DsAttributeValue
3635             __ndr_size               : 0x0000007e (126)
3636             blob                     : *
3637                 blob                     : DATA_BLOB length=126
3638         flags                    : 0x00000001 (1)
3639                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3640         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3641         meta_data: struct drsuapi_DsReplicaMetaData
3642             version                  : 0x00000015 (21)
3643             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3644             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3645             originating_usn          : 0x000000000001e19c (123292)
3646
3647 (for cases where the link is to a normal DN)
3648      &target: struct drsuapi_DsReplicaObjectIdentifier3
3649         __ndr_size               : 0x0000007e (126)
3650         __ndr_size_sid           : 0x0000001c (28)
3651         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3652         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3653         __ndr_size_dn            : 0x00000022 (34)
3654         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3655  */
3656
3657         /* find the attribute being modified */
3658         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3659         if (attr == NULL) {
3660                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3661                 talloc_free(tmp_ctx);
3662                 return LDB_ERR_OPERATIONS_ERROR;
3663         }
3664
3665         attrs[0] = attr->lDAPDisplayName;
3666         attrs[1] = NULL;
3667
3668         /* get the existing message from the db for the object with
3669            this GUID, returning attribute being modified. We will then
3670            use this msg as the basis for a modify call */
3671         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3672                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3673                                  DSDB_SEARCH_SHOW_DELETED |
3674                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3675                                  DSDB_SEARCH_REVEAL_INTERNALS,
3676                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3677         if (ret != LDB_SUCCESS) {
3678                 talloc_free(tmp_ctx);
3679                 return ret;
3680         }
3681         if (res->count != 1) {
3682                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3683                                        GUID_string(tmp_ctx, &la->identifier->guid));
3684                 talloc_free(tmp_ctx);
3685                 return LDB_ERR_NO_SUCH_OBJECT;
3686         }
3687         msg = res->msgs[0];
3688
3689         if (msg->num_elements == 0) {
3690                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3691                 if (ret != LDB_SUCCESS) {
3692                         ldb_module_oom(module);
3693                         talloc_free(tmp_ctx);
3694                         return LDB_ERR_OPERATIONS_ERROR;
3695                 }
3696         } else {
3697                 old_el = &msg->elements[0];
3698                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3699         }
3700
3701         /* parse the existing links */
3702         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3703         if (ret != LDB_SUCCESS) {
3704                 talloc_free(tmp_ctx);
3705                 return ret;
3706         }
3707
3708         /* get our invocationId */
3709         our_invocation_id = samdb_ntds_invocation_id(ldb);
3710         if (!our_invocation_id) {
3711                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3712                 talloc_free(tmp_ctx);
3713                 return LDB_ERR_OPERATIONS_ERROR;
3714         }
3715
3716         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
3717         if (ret != LDB_SUCCESS) {
3718                 talloc_free(tmp_ctx);
3719                 return ret;
3720         }
3721
3722         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3723         if (!W_ERROR_IS_OK(status)) {
3724                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3725                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3726                 return LDB_ERR_OPERATIONS_ERROR;
3727         }
3728
3729         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3730         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3731                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3732                                        old_el->name,
3733                                        ldb_dn_get_linearized(dsdb_dn->dn),
3734                                        ldb_dn_get_linearized(msg->dn));
3735                 return LDB_ERR_OPERATIONS_ERROR;
3736         }
3737
3738         /* re-resolve the DN by GUID, as the DRS server may give us an
3739            old DN value */
3740         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
3741         if (ret != LDB_SUCCESS) {
3742                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s",
3743                          GUID_string(tmp_ctx, &guid),
3744                          ldb_dn_get_linearized(dsdb_dn->dn)));
3745         }
3746
3747         /* see if this link already exists */
3748         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3749         if (pdn != NULL) {
3750                 /* see if this update is newer than what we have already */
3751                 struct GUID invocation_id = GUID_zero();
3752                 uint32_t version = 0;
3753                 NTTIME change_time = 0;
3754                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3755
3756                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3757                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3758                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3759
3760                 if (!replmd_update_is_newer(&invocation_id,
3761                                             &la->meta_data.originating_invocation_id,
3762                                             version,
3763                                             la->meta_data.version,
3764                                             change_time,
3765                                             la->meta_data.originating_change_time)) {
3766                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3767                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3768                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3769                         talloc_free(tmp_ctx);
3770                         return LDB_SUCCESS;
3771                 }
3772
3773                 /* get a seq_num for this change */
3774                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3775                 if (ret != LDB_SUCCESS) {
3776                         talloc_free(tmp_ctx);
3777                         return ret;
3778                 }
3779
3780                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
3781                         /* remove the existing backlink */
3782                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3783                         if (ret != LDB_SUCCESS) {
3784                                 talloc_free(tmp_ctx);
3785                                 return ret;
3786                         }
3787                 }
3788
3789                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3790                                            &la->meta_data.originating_invocation_id,
3791                                            la->meta_data.originating_usn, seq_num,
3792                                            la->meta_data.originating_change_time,
3793                                            la->meta_data.version,
3794                                            !active);
3795                 if (ret != LDB_SUCCESS) {
3796                         talloc_free(tmp_ctx);
3797                         return ret;
3798                 }
3799
3800                 if (active) {
3801                         /* add the new backlink */
3802                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3803                         if (ret != LDB_SUCCESS) {
3804                                 talloc_free(tmp_ctx);
3805                                 return ret;
3806                         }
3807                 }
3808         } else {
3809                 /* get a seq_num for this change */
3810                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3811                 if (ret != LDB_SUCCESS) {
3812                         talloc_free(tmp_ctx);
3813                         return ret;
3814                 }
3815
3816                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3817                                                 struct ldb_val, old_el->num_values+1);
3818                 if (!old_el->values) {
3819                         ldb_module_oom(module);
3820                         return LDB_ERR_OPERATIONS_ERROR;
3821                 }
3822                 old_el->num_values++;
3823
3824                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3825                                           &la->meta_data.originating_invocation_id,
3826                                           la->meta_data.originating_usn, seq_num,
3827                                           la->meta_data.originating_change_time,
3828                                           la->meta_data.version,
3829                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3830                 if (ret != LDB_SUCCESS) {
3831                         talloc_free(tmp_ctx);
3832                         return ret;
3833                 }
3834
3835                 if (active) {
3836                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3837                                                   true, attr, false);
3838                         if (ret != LDB_SUCCESS) {
3839                                 talloc_free(tmp_ctx);
3840                                 return ret;
3841                         }
3842                 }
3843         }
3844
3845         /* we only change whenChanged and uSNChanged if the seq_num
3846            has changed */
3847         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3848                 talloc_free(tmp_ctx);
3849                 return LDB_ERR_OPERATIONS_ERROR;
3850         }
3851
3852         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3853                 talloc_free(tmp_ctx);
3854                 return LDB_ERR_OPERATIONS_ERROR;
3855         }
3856
3857         ret = dsdb_check_single_valued_link(attr, old_el);
3858         if (ret != LDB_SUCCESS) {
3859                 talloc_free(tmp_ctx);
3860                 return ret;
3861         }
3862
3863         ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
3864         if (ret != LDB_SUCCESS) {
3865                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
3866                           ldb_errstring(ldb),
3867                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
3868                 talloc_free(tmp_ctx);
3869                 return ret;
3870         }
3871
3872         talloc_free(tmp_ctx);
3873
3874         return ret;
3875 }
3876
3877 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
3878 {
3879         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
3880                 return replmd_extended_replicated_objects(module, req);
3881         }
3882
3883         return ldb_next_request(module, req);
3884 }
3885
3886
3887 /*
3888   we hook into the transaction operations to allow us to
3889   perform the linked attribute updates at the end of the whole
3890   transaction. This allows a forward linked attribute to be created
3891   before the object is created. During a vampire, w2k8 sends us linked
3892   attributes before the objects they are part of.
3893  */
3894 static int replmd_start_transaction(struct ldb_module *module)
3895 {
3896         /* create our private structure for this transaction */
3897         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
3898                                                                 struct replmd_private);
3899         replmd_txn_cleanup(replmd_private);
3900
3901         /* free any leftover mod_usn records from cancelled
3902            transactions */
3903         while (replmd_private->ncs) {
3904                 struct nc_entry *e = replmd_private->ncs;
3905                 DLIST_REMOVE(replmd_private->ncs, e);
3906                 talloc_free(e);
3907         }
3908
3909         return ldb_next_start_trans(module);
3910 }
3911
3912 /*
3913   on prepare commit we loop over our queued la_context structures and
3914   apply each of them
3915  */
3916 static int replmd_prepare_commit(struct ldb_module *module)
3917 {
3918         struct replmd_private *replmd_private =
3919                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3920         struct la_entry *la, *prev;
3921         struct la_backlink *bl;
3922         int ret;
3923
3924         /* walk the list backwards, to do the first entry first, as we
3925          * added the entries with DLIST_ADD() which puts them at the
3926          * start of the list */
3927         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
3928                 prev = DLIST_PREV(la);
3929                 DLIST_REMOVE(replmd_private->la_list, la);
3930                 ret = replmd_process_linked_attribute(module, la);
3931                 if (ret != LDB_SUCCESS) {
3932                         replmd_txn_cleanup(replmd_private);
3933                         return ret;
3934                 }
3935         }
3936
3937         /* process our backlink list, creating and deleting backlinks
3938            as necessary */
3939         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
3940                 ret = replmd_process_backlink(module, bl);
3941                 if (ret != LDB_SUCCESS) {
3942                         replmd_txn_cleanup(replmd_private);
3943                         return ret;
3944                 }
3945         }
3946
3947         replmd_txn_cleanup(replmd_private);
3948
3949         /* possibly change @REPLCHANGED */
3950         ret = replmd_notify_store(module);
3951         if (ret != LDB_SUCCESS) {
3952                 return ret;
3953         }
3954
3955         return ldb_next_prepare_commit(module);
3956 }
3957
3958 static int replmd_del_transaction(struct ldb_module *module)
3959 {
3960         struct replmd_private *replmd_private =
3961                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3962         replmd_txn_cleanup(replmd_private);
3963
3964         return ldb_next_del_trans(module);
3965 }
3966
3967
3968 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
3969         .name          = "repl_meta_data",
3970         .init_context      = replmd_init,
3971         .add               = replmd_add,
3972         .modify            = replmd_modify,
3973         .rename            = replmd_rename,
3974         .del               = replmd_delete,
3975         .extended          = replmd_extended,
3976         .start_transaction = replmd_start_transaction,
3977         .prepare_commit    = replmd_prepare_commit,
3978         .del_transaction   = replmd_del_transaction,
3979 };