source4/dsdb/samdb/ldb_modules/repl_meta_data.c

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