source4/dsdb/samdb/ldb_modules/repl_meta_data.c

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