source4/dsdb/samdb/ldb_modules/partition_init.c

   1 /*
   2    Partitions ldb module
   3
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2006
   5    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 /*
  22  *  Name: ldb
  23  *
  24  *  Component: ldb partitions module
  25  *
  26  *  Description: Implement LDAP partitions
  27  *
  28  *  Author: Andrew Bartlett
  29  *  Author: Stefan Metzmacher
  30  */
  31
  32 #include "dsdb/samdb/ldb_modules/partition.h"
  33 #include "lib/util/tsort.h"
  34 #include "lib/ldb-samba/ldb_wrap.h"
  35 #include "system/filesys.h"
  36
  37 static int partition_sort_compare(const void *v1, const void *v2)
  38 {
  39         const struct dsdb_partition *p1;
  40         const struct dsdb_partition *p2;
  41
  42         p1 = *((struct dsdb_partition * const*)v1);
  43         p2 = *((struct dsdb_partition * const*)v2);
  44
  45         return ldb_dn_compare(p1->ctrl->dn, p2->ctrl->dn);
  46 }
  47
  48 /* Load the list of DNs that we must replicate to all partitions */
  49 static int partition_load_replicate_dns(struct ldb_context *ldb,
  50                                         struct partition_private_data *data,
  51                                         struct ldb_message *msg)
  52 {
  53         struct ldb_message_element *replicate_attributes = ldb_msg_find_element(msg, "replicateEntries");
  54
  55         talloc_free(data->replicate);
  56         if (!replicate_attributes) {
  57                 data->replicate = NULL;
  58         } else {
  59                 unsigned int i;
  60                 data->replicate = talloc_array(data, struct ldb_dn *, replicate_attributes->num_values + 1);
  61                 if (!data->replicate) {
  62                         return ldb_oom(ldb);
  63                 }
  64
  65                 for (i=0; i < replicate_attributes->num_values; i++) {
  66                         data->replicate[i] = ldb_dn_from_ldb_val(data->replicate, ldb, &replicate_attributes->values[i]);
  67                         if (!ldb_dn_validate(data->replicate[i])) {
  68                                 ldb_asprintf_errstring(ldb,
  69                                                         "partition_init: "
  70                                                         "invalid DN in partition replicate record: %s",
  71                                                         replicate_attributes->values[i].data);
  72                                 return LDB_ERR_CONSTRAINT_VIOLATION;
  73                         }
  74                 }
  75                 data->replicate[i] = NULL;
  76         }
  77         return LDB_SUCCESS;
  78 }
  79
  80 /* Load the list of modules for the partitions */
  81 static int partition_load_modules(struct ldb_context *ldb,
  82                                   struct partition_private_data *data, struct ldb_message *msg)
  83 {
  84         unsigned int i;
  85         struct ldb_message_element *modules_attributes = ldb_msg_find_element(msg, "modules");
  86         talloc_free(data->modules);
  87         if (!modules_attributes) {
  88                 return LDB_SUCCESS;
  89         }
  90
  91         data->modules = talloc_array(data, struct partition_module *, modules_attributes->num_values + 1);
  92         if (!data->modules) {
  93                 return ldb_oom(ldb);
  94         }
  95
  96         for (i=0; i < modules_attributes->num_values; i++) {
  97                 char *p;
  98                 DATA_BLOB dn_blob;
  99                 data->modules[i] = talloc(data->modules, struct partition_module);
 100                 if (!data->modules[i]) {
 101                         return ldb_oom(ldb);
 102                 }
 103
 104                 dn_blob = modules_attributes->values[i];
 105
 106                 p = strchr((const char *)dn_blob.data, ':');
 107                 if (!p) {
 108                         ldb_asprintf_errstring(ldb,
 109                                                "partition_load_modules: "
 110                                                "invalid form for partition module record (missing ':'): %s", (const char *)dn_blob.data);
 111                         return LDB_ERR_CONSTRAINT_VIOLATION;
 112                 }
 113                 /* Now trim off the filename */
 114                 dn_blob.length = ((uint8_t *)p - dn_blob.data);
 115
 116                 p++;
 117                 data->modules[i]->modules = ldb_modules_list_from_string(ldb, data->modules[i],
 118                                                                          p);
 119
 120                 if (dn_blob.length == 1 && dn_blob.data[0] == '*') {
 121                         data->modules[i]->dn = NULL;
 122                 } else {
 123                         data->modules[i]->dn = ldb_dn_from_ldb_val(data->modules[i], ldb, &dn_blob);
 124                         if (!data->modules[i]->dn || !ldb_dn_validate(data->modules[i]->dn)) {
 125                                 return ldb_operr(ldb);
 126                         }
 127                 }
 128         }
 129         data->modules[i] = NULL;
 130         return LDB_SUCCESS;
 131 }
 132
 133 static int partition_reload_metadata(struct ldb_module *module, struct partition_private_data *data,
 134                                      TALLOC_CTX *mem_ctx, struct ldb_message **_msg,
 135                                      struct ldb_request *parent)
 136 {
 137         int ret;
 138         struct ldb_message *msg, *module_msg;
 139         struct ldb_result *res;
 140         struct ldb_context *ldb = ldb_module_get_ctx(module);
 141         const char *attrs[] = { "partition", "replicateEntries", "modules", "ldapBackend", NULL };
 142         /* perform search for @PARTITION, looking for module, replicateEntries and ldapBackend */
 143         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 144                                     ldb_dn_new(mem_ctx, ldb, DSDB_PARTITION_DN),
 145                                     attrs,
 146                                     DSDB_FLAG_NEXT_MODULE, parent);
 147         if (ret != LDB_SUCCESS) {
 148                 return ret;
 149         }
 150
 151         msg = res->msgs[0];
 152
 153         ret = partition_load_replicate_dns(ldb, data, msg);
 154         if (ret != LDB_SUCCESS) {
 155                 return ret;
 156         }
 157
 158         /* When used from Samba4, this message is set by the samba4
 159          * module, as a fixed value not read from the DB.  This avoids
 160          * listing modules in the DB */
 161         if (data->forced_module_msg) {
 162                 module_msg = data->forced_module_msg;
 163         } else {
 164                 module_msg = msg;
 165         }
 166
 167         ret = partition_load_modules(ldb, data, module_msg);
 168         if (ret != LDB_SUCCESS) {
 169                 return ret;
 170         }
 171
 172         data->ldapBackend = talloc_steal(data, ldb_msg_find_attr_as_string(msg, "ldapBackend", NULL));
 173         if (_msg) {
 174                 *_msg = msg;
 175         } else {
 176                 talloc_free(msg);
 177         }
 178
 179         return LDB_SUCCESS;
 180 }
 181
 182 static const char **find_modules_for_dn(struct partition_private_data *data, struct ldb_dn *dn)
 183 {
 184         unsigned int i;
 185         struct partition_module *default_mod = NULL;
 186         for (i=0; data->modules && data->modules[i]; i++) {
 187                 if (!data->modules[i]->dn) {
 188                         default_mod = data->modules[i];
 189                 } else if (ldb_dn_compare(dn, data->modules[i]->dn) == 0) {
 190                         return data->modules[i]->modules;
 191                 }
 192         }
 193         if (default_mod) {
 194                 return default_mod->modules;
 195         } else {
 196                 return NULL;
 197         }
 198 }
 199
 200 static int new_partition_from_dn(struct ldb_context *ldb, struct partition_private_data *data,
 201                                  TALLOC_CTX *mem_ctx,
 202                                  struct ldb_dn *dn, const char *filename,
 203                                  struct dsdb_partition **partition) {
 204         const char *backend_url;
 205         struct dsdb_control_current_partition *ctrl;
 206         struct ldb_module *backend_module;
 207         struct ldb_module *module_chain;
 208         const char **modules;
 209         int ret;
 210
 211         (*partition) = talloc(mem_ctx, struct dsdb_partition);
 212         if (!*partition) {
 213                 return ldb_oom(ldb);
 214         }
 215
 216         (*partition)->ctrl = ctrl = talloc((*partition), struct dsdb_control_current_partition);
 217         if (!ctrl) {
 218                 talloc_free(*partition);
 219                 return ldb_oom(ldb);
 220         }
 221
 222         /* See if an LDAP backend has been specified */
 223         if (data->ldapBackend) {
 224                 (*partition)->backend_url = data->ldapBackend;
 225         } else {
 226                 /* the backend LDB is the DN (base64 encoded if not 'plain') followed by .ldb */
 227                 backend_url = ldb_relative_path(ldb,
 228                                                   *partition,
 229                                                   filename);
 230                 if (!backend_url) {
 231                         ldb_asprintf_errstring(ldb,
 232                                                "partition_init: unable to determine an relative path for partition: %s", filename);
 233                         talloc_free(*partition);
 234                         return LDB_ERR_OPERATIONS_ERROR;
 235                 }
 236                 (*partition)->backend_url = talloc_steal((*partition), backend_url);
 237
 238                 if (!(ldb_module_flags(ldb) & LDB_FLG_RDONLY)) {
 239                         char *p;
 240                         char *backend_dir = talloc_strdup(*partition, backend_url);
 241
 242                         p = strrchr(backend_dir, '/');
 243                         if (p) {
 244                                 p[0] = '\0';
 245                         }
 246
 247                         /* Failure is quite reasonable, it might alredy exist */
 248                         mkdir(backend_dir, 0700);
 249                         talloc_free(backend_dir);
 250                 }
 251
 252         }
 253
 254         ctrl->version = DSDB_CONTROL_CURRENT_PARTITION_VERSION;
 255         ctrl->dn = talloc_steal(ctrl, dn);
 256
 257         ret = ldb_module_connect_backend(ldb, (*partition)->backend_url, NULL, &backend_module);
 258         if (ret != LDB_SUCCESS) {
 259                 return ret;
 260         }
 261         talloc_steal((*partition), backend_module);
 262
 263         modules = find_modules_for_dn(data, dn);
 264
 265         if (!modules) {
 266                 DEBUG(0, ("Unable to load partition modules for new DN %s, perhaps you need to reprovision?  See partition-upgrade.txt for instructions\n", ldb_dn_get_linearized(dn)));
 267                 talloc_free(*partition);
 268                 return LDB_ERR_CONSTRAINT_VIOLATION;
 269         }
 270         ret = ldb_module_load_list(ldb, modules, backend_module, &module_chain);
 271         if (ret != LDB_SUCCESS) {
 272                 ldb_asprintf_errstring(ldb,
 273                                        "partition_init: "
 274                                        "loading backend for %s failed: %s",
 275                                        ldb_dn_get_linearized(dn), ldb_errstring(ldb));
 276                 talloc_free(*partition);
 277                 return ret;
 278         }
 279         ret = ldb_module_init_chain(ldb, module_chain);
 280         if (ret != LDB_SUCCESS) {
 281                 ldb_asprintf_errstring(ldb,
 282                                        "partition_init: "
 283                                        "initialising backend for %s failed: %s",
 284                                        ldb_dn_get_linearized(dn), ldb_errstring(ldb));
 285                 talloc_free(*partition);
 286                 return ret;
 287         }
 288
 289         /* This weirdness allows us to use ldb_next_request() in partition.c */
 290         (*partition)->module = ldb_module_new(*partition, ldb, "partition_next", NULL);
 291         if (!(*partition)->module) {
 292                 talloc_free(*partition);
 293                 return ldb_oom(ldb);
 294         }
 295         ldb_module_set_next((*partition)->module, talloc_steal((*partition)->module, module_chain));
 296
 297         /* if we were in a transaction then we need to start a
 298            transaction on this new partition, otherwise we'll get a
 299            transaction mismatch when we end the transaction */
 300         if (data->in_transaction) {
 301                 if (ldb_module_flags(ldb) & LDB_FLG_ENABLE_TRACING) {
 302                         ldb_debug(ldb, LDB_DEBUG_TRACE, "partition_start_trans() -> %s (new partition)",
 303                                   ldb_dn_get_linearized((*partition)->ctrl->dn));
 304                 }
 305                 ret = ldb_next_start_trans((*partition)->module);
 306         }
 307
 308         return ret;
 309 }
 310
 311 /* Tell the rootDSE about the new partition */
 312 static int partition_register(struct ldb_context *ldb, struct dsdb_control_current_partition *ctrl)
 313 {
 314         struct ldb_request *req;
 315         int ret;
 316
 317         req = talloc_zero(NULL, struct ldb_request);
 318         if (req == NULL) {
 319                 return ldb_oom(ldb);
 320         }
 321
 322         req->operation = LDB_REQ_REGISTER_PARTITION;
 323         req->op.reg_partition.dn = ctrl->dn;
 324         req->callback = ldb_op_default_callback;
 325
 326         ldb_set_timeout(ldb, req, 0);
 327
 328         req->handle = ldb_handle_new(req, ldb);
 329         if (req->handle == NULL) {
 330                 talloc_free(req);
 331                 return ldb_operr(ldb);
 332         }
 333
 334         ret = ldb_request(ldb, req);
 335         if (ret == LDB_SUCCESS) {
 336                 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
 337         }
 338         if (ret != LDB_SUCCESS) {
 339                 ldb_debug(ldb, LDB_DEBUG_ERROR, "partition: Unable to register partition with rootdse!\n");
 340                 talloc_free(req);
 341                 return LDB_ERR_OTHER;
 342         }
 343         talloc_free(req);
 344
 345         return LDB_SUCCESS;
 346 }
 347
 348 /* Add a newly found partition to the global data */
 349 static int add_partition_to_data(struct ldb_context *ldb, struct partition_private_data *data,
 350                                  struct dsdb_partition *partition)
 351 {
 352         unsigned int i;
 353         int ret;
 354
 355         /* Count the partitions */
 356         for (i=0; data->partitions && data->partitions[i]; i++) { /* noop */};
 357
 358         /* Add partition to list of partitions */
 359         data->partitions = talloc_realloc(data, data->partitions, struct dsdb_partition *, i + 2);
 360         if (!data->partitions) {
 361                 return ldb_oom(ldb);
 362         }
 363         data->partitions[i] = talloc_steal(data->partitions, partition);
 364         data->partitions[i+1] = NULL;
 365
 366         /* Sort again (should use binary insert) */
 367         TYPESAFE_QSORT(data->partitions, i+1, partition_sort_compare);
 368
 369         ret = partition_register(ldb, partition->ctrl);
 370         if (ret != LDB_SUCCESS) {
 371                 return ret;
 372         }
 373         return LDB_SUCCESS;
 374 }
 375
 376 int partition_reload_if_required(struct ldb_module *module,
 377                                  struct partition_private_data *data,
 378                                  struct ldb_request *parent)
 379 {
 380         uint64_t seq;
 381         int ret;
 382         unsigned int i;
 383         struct ldb_context *ldb = ldb_module_get_ctx(module);
 384         struct ldb_message *msg;
 385         struct ldb_message_element *partition_attributes;
 386         TALLOC_CTX *mem_ctx;
 387
 388         if (!data) {
 389                 /* Not initialised yet */
 390                 return LDB_SUCCESS;
 391         }
 392
 393         mem_ctx = talloc_new(data);
 394         if (!mem_ctx) {
 395                 return ldb_oom(ldb);
 396         }
 397
 398         ret = partition_primary_sequence_number(module, mem_ctx, LDB_SEQ_HIGHEST_SEQ, &seq);
 399         if (ret != LDB_SUCCESS) {
 400                 talloc_free(mem_ctx);
 401                 return ret;
 402         }
 403         if (seq == data->metadata_seq) {
 404                 talloc_free(mem_ctx);
 405                 return LDB_SUCCESS;
 406         }
 407
 408         ret = partition_reload_metadata(module, data, mem_ctx, &msg, parent);
 409         if (ret != LDB_SUCCESS) {
 410                 talloc_free(mem_ctx);
 411                 return ret;
 412         }
 413
 414         data->metadata_seq = seq;
 415
 416         partition_attributes = ldb_msg_find_element(msg, "partition");
 417
 418         for (i=0; partition_attributes && i < partition_attributes->num_values; i++) {
 419                 unsigned int j;
 420                 bool new_partition = true;
 421                 const char *filename = NULL;
 422                 DATA_BLOB dn_blob;
 423                 struct ldb_dn *dn;
 424                 struct dsdb_partition *partition;
 425                 struct ldb_result *dn_res;
 426                 const char *no_attrs[] = { NULL };
 427
 428                 for (j=0; data->partitions && data->partitions[j]; j++) {
 429                         if (data_blob_cmp(&data->partitions[j]->orig_record, &partition_attributes->values[i]) == 0) {
 430                                 new_partition = false;
 431                                 break;
 432                         }
 433                 }
 434                 if (new_partition == false) {
 435                         continue;
 436                 }
 437
 438                 dn_blob = partition_attributes->values[i];
 439
 440                 if (dn_blob.length > 4 &&
 441                     (strncmp((const char *)&dn_blob.data[dn_blob.length-4], ".ldb", 4) == 0)) {
 442
 443                         /* Look for DN:filename.ldb */
 444                         char *p = strrchr((const char *)dn_blob.data, ':');
 445                         if (!p) {
 446                                 ldb_asprintf_errstring(ldb,
 447                                                        "partition_init: invalid DN in attempting to parse partition record: %s", (const char *)dn_blob.data);
 448                                 talloc_free(mem_ctx);
 449                                 return LDB_ERR_CONSTRAINT_VIOLATION;
 450                         }
 451                         filename = p+1;
 452
 453                         /* Now trim off the filename */
 454                         dn_blob.length = ((uint8_t *)p - dn_blob.data);
 455                 }
 456
 457                 dn = ldb_dn_from_ldb_val(mem_ctx, ldb, &dn_blob);
 458                 if (!dn) {
 459                         ldb_asprintf_errstring(ldb,
 460                                                "partition_init: invalid DN in partition record: %s", (const char *)dn_blob.data);
 461                         talloc_free(mem_ctx);
 462                         return LDB_ERR_CONSTRAINT_VIOLATION;
 463                 }
 464
 465                 /* Now do a slow check with the DN compare */
 466                 for (j=0; data->partitions && data->partitions[j]; j++) {
 467                         if (ldb_dn_compare(dn, data->partitions[j]->ctrl->dn) == 0) {
 468                                 new_partition = false;
 469                                 break;
 470                         }
 471                 }
 472                 if (new_partition == false) {
 473                         continue;
 474                 }
 475
 476                 if (!filename) {
 477                         char *base64_dn = NULL;
 478                         const char *p;
 479                         for (p = ldb_dn_get_linearized(dn); *p; p++) {
 480                                 /* We have such a strict check because I don't want shell metacharacters in the file name, nor ../ */
 481                                 if (!(isalnum(*p) || *p == ' ' || *p == '=' || *p == ',')) {
 482                                         break;
 483                                 }
 484                         }
 485                         if (*p) {
 486                                 base64_dn = ldb_base64_encode(data, ldb_dn_get_linearized(dn), strlen(ldb_dn_get_linearized(dn)));
 487                                 filename = talloc_asprintf(mem_ctx, "%s.ldb", base64_dn);
 488                         } else {
 489                                 filename = talloc_asprintf(mem_ctx, "%s.ldb", ldb_dn_get_linearized(dn));
 490                         }
 491                 }
 492
 493                 /* We call ldb_dn_get_linearized() because the DN in
 494                  * partition_attributes is already casefolded
 495                  * correctly.  We don't want to mess that up as the
 496                  * schema isn't loaded yet */
 497                 ret = new_partition_from_dn(ldb, data, data->partitions, dn,
 498                                             filename,
 499                                             &partition);
 500                 if (ret != LDB_SUCCESS) {
 501                         talloc_free(mem_ctx);
 502                         return ret;
 503                 }
 504
 505                 talloc_steal(partition, partition_attributes->values[i].data);
 506                 partition->orig_record = partition_attributes->values[i];
 507
 508                 /* Get the 'correct' case of the partition DNs from the database */
 509                 ret = dsdb_module_search_dn(partition->module, data, &dn_res,
 510                                             dn, no_attrs,
 511                                             DSDB_FLAG_NEXT_MODULE, parent);
 512                 if (ret == LDB_SUCCESS) {
 513                         talloc_free(partition->ctrl->dn);
 514                         partition->ctrl->dn = talloc_steal(partition->ctrl, dn_res->msgs[0]->dn);
 515                         talloc_free(dn_res);
 516                 } else if (ret != LDB_ERR_NO_SUCH_OBJECT) {
 517                         ldb_asprintf_errstring(ldb,
 518                                                "Failed to search for partition base %s in new partition at %s: %s",
 519                                                ldb_dn_get_linearized(dn),
 520                                                partition->backend_url,
 521                                                ldb_errstring(ldb));
 522                         talloc_free(mem_ctx);
 523                         return ret;
 524                 }
 525
 526                 ret = add_partition_to_data(ldb, data, partition);
 527                 if (ret != LDB_SUCCESS) {
 528                         talloc_free(mem_ctx);
 529                         return ret;
 530                 }
 531         }
 532
 533         talloc_free(mem_ctx);
 534         return LDB_SUCCESS;
 535 }
 536
 537 /* Copy the metadata (@OPTIONS etc) for the new partition into the partition */
 538
 539 static int new_partition_set_replicated_metadata(struct ldb_context *ldb,
 540                                                  struct ldb_module *module, struct ldb_request *last_req,
 541                                                  struct partition_private_data *data,
 542                                                  struct dsdb_partition *partition)
 543 {
 544         unsigned int i;
 545         int ret;
 546         /* for each replicate, copy from main partition.  If we get an error, we report it up the chain */
 547         for (i=0; data->replicate && data->replicate[i]; i++) {
 548                 struct ldb_result *replicate_res;
 549                 struct ldb_request *add_req;
 550                 ret = dsdb_module_search_dn(module, last_req, &replicate_res,
 551                                             data->replicate[i],
 552                                             NULL,
 553                                             DSDB_FLAG_NEXT_MODULE, NULL);
 554                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 555                         continue;
 556                 }
 557                 if (ret != LDB_SUCCESS) {
 558                         ldb_asprintf_errstring(ldb,
 559                                                "Failed to search for %s from " DSDB_PARTITION_DN
 560                                                " replicateEntries for new partition at %s on %s: %s",
 561                                                ldb_dn_get_linearized(data->replicate[i]),
 562                                                partition->backend_url,
 563                                                ldb_dn_get_linearized(partition->ctrl->dn),
 564                                                ldb_errstring(ldb));
 565                         return ret;
 566                 }
 567
 568                 /* Build add request */
 569                 ret = ldb_build_add_req(&add_req, ldb, replicate_res,
 570                                         replicate_res->msgs[0], NULL, NULL,
 571                                         ldb_op_default_callback, last_req);
 572                 LDB_REQ_SET_LOCATION(add_req);
 573                 last_req = add_req;
 574                 if (ret != LDB_SUCCESS) {
 575                         /* return directly, this is a very unlikely error */
 576                         return ret;
 577                 }
 578                 /* do request */
 579                 ret = ldb_next_request(partition->module, add_req);
 580                 /* wait */
 581                 if (ret == LDB_SUCCESS) {
 582                         ret = ldb_wait(add_req->handle, LDB_WAIT_ALL);
 583                 }
 584
 585                 switch (ret) {
 586                 case LDB_SUCCESS:
 587                         break;
 588
 589                 case LDB_ERR_ENTRY_ALREADY_EXISTS:
 590                         /* Handle this case specially - if the
 591                          * metadata already exists, replace it */
 592                 {
 593                         struct ldb_request *del_req;
 594
 595                         /* Don't leave a confusing string in the ldb_errstring() */
 596                         ldb_reset_err_string(ldb);
 597                         /* Build del request */
 598                         ret = ldb_build_del_req(&del_req, ldb, replicate_res, replicate_res->msgs[0]->dn, NULL, NULL,
 599                                                 ldb_op_default_callback, last_req);
 600                         LDB_REQ_SET_LOCATION(del_req);
 601                         last_req = del_req;
 602                         if (ret != LDB_SUCCESS) {
 603                                 /* return directly, this is a very unlikely error */
 604                                 return ret;
 605                         }
 606                         /* do request */
 607                         ret = ldb_next_request(partition->module, del_req);
 608
 609                         /* wait */
 610                         if (ret == LDB_SUCCESS) {
 611                                 ret = ldb_wait(del_req->handle, LDB_WAIT_ALL);
 612                         }
 613                         if (ret != LDB_SUCCESS) {
 614                                 ldb_asprintf_errstring(ldb,
 615                                                        "Failed to delete  (for re-add) %s from " DSDB_PARTITION_DN
 616                                                        " replicateEntries in new partition at %s on %s: %s",
 617                                                        ldb_dn_get_linearized(data->replicate[i]),
 618                                                        partition->backend_url,
 619                                                        ldb_dn_get_linearized(partition->ctrl->dn),
 620                                                        ldb_errstring(ldb));
 621                                 return ret;
 622                         }
 623
 624                         /* Build add request */
 625                         ret = ldb_build_add_req(&add_req, ldb, replicate_res, replicate_res->msgs[0], NULL, NULL,
 626                                                 ldb_op_default_callback, last_req);
 627                         LDB_REQ_SET_LOCATION(add_req);
 628                         last_req = add_req;
 629                         if (ret != LDB_SUCCESS) {
 630                                 /* return directly, this is a very unlikely error */
 631                                 return ret;
 632                         }
 633
 634                         /* do the add again */
 635                         ret = ldb_next_request(partition->module, add_req);
 636
 637                         /* wait */
 638                         if (ret == LDB_SUCCESS) {
 639                                 ret = ldb_wait(add_req->handle, LDB_WAIT_ALL);
 640                         }
 641
 642                         if (ret != LDB_SUCCESS) {
 643                                 ldb_asprintf_errstring(ldb,
 644                                                        "Failed to add (after delete) %s from " DSDB_PARTITION_DN
 645                                                        " replicateEntries to new partition at %s on %s: %s",
 646                                                        ldb_dn_get_linearized(data->replicate[i]),
 647                                                        partition->backend_url,
 648                                                        ldb_dn_get_linearized(partition->ctrl->dn),
 649                                                        ldb_errstring(ldb));
 650                                 return ret;
 651                         }
 652                         break;
 653                 }
 654                 default:
 655                 {
 656                         ldb_asprintf_errstring(ldb,
 657                                                "Failed to add %s from " DSDB_PARTITION_DN
 658                                                " replicateEntries to new partition at %s on %s: %s",
 659                                                ldb_dn_get_linearized(data->replicate[i]),
 660                                                partition->backend_url,
 661                                                ldb_dn_get_linearized(partition->ctrl->dn),
 662                                                ldb_errstring(ldb));
 663                         return ret;
 664                 }
 665                 }
 666
 667                 /* And around again, for the next thing we must merge */
 668         }
 669         return LDB_SUCCESS;
 670 }
 671
 672 /* Extended operation to create a new partition, called when
 673  * 'new_partition' detects that one is being added based on it's
 674  * instanceType */
 675 int partition_create(struct ldb_module *module, struct ldb_request *req)
 676 {
 677         unsigned int i;
 678         int ret;
 679         struct ldb_context *ldb = ldb_module_get_ctx(module);
 680         struct ldb_request *mod_req, *last_req = req;
 681         struct ldb_message *mod_msg;
 682         struct partition_private_data *data;
 683         struct dsdb_partition *partition = NULL;
 684         const char *casefold_dn;
 685         bool new_partition = false;
 686
 687         /* Check if this is already a partition */
 688
 689         struct dsdb_create_partition_exop *ex_op = talloc_get_type(req->op.extended.data, struct dsdb_create_partition_exop);
 690         struct ldb_dn *dn = ex_op->new_dn;
 691
 692         data = talloc_get_type(ldb_module_get_private(module), struct partition_private_data);
 693         if (!data) {
 694                 /* We are not going to create a partition before we are even set up */
 695                 return LDB_ERR_UNWILLING_TO_PERFORM;
 696         }
 697
 698         for (i=0; data->partitions && data->partitions[i]; i++) {
 699                 if (ldb_dn_compare(data->partitions[i]->ctrl->dn, dn) == 0) {
 700                         partition = data->partitions[i];
 701                 }
 702         }
 703
 704         if (!partition) {
 705                 char *filename;
 706                 char *partition_record;
 707                 new_partition = true;
 708                 mod_msg = ldb_msg_new(req);
 709                 if (!mod_msg) {
 710                         return ldb_oom(ldb);
 711                 }
 712
 713                 mod_msg->dn = ldb_dn_new(mod_msg, ldb, DSDB_PARTITION_DN);
 714                 ret = ldb_msg_add_empty(mod_msg, DSDB_PARTITION_ATTR, LDB_FLAG_MOD_ADD, NULL);
 715                 if (ret != LDB_SUCCESS) {
 716                         return ret;
 717                 }
 718
 719                 casefold_dn = ldb_dn_get_casefold(dn);
 720
 721                 {
 722                         char *escaped;
 723                         const char *p, *sam_name;
 724                         sam_name = strrchr((const char *)ldb_get_opaque(ldb, "ldb_url"), '/');
 725                         if (!sam_name) {
 726                                 return ldb_operr(ldb);
 727                         }
 728                         sam_name++;
 729
 730                         for (p = casefold_dn; *p; p++) {
 731                                 /* We have such a strict check because
 732                                  * I don't want shell metacharacters
 733                                  * in the file name, nor ../, but I do
 734                                  * want it to be easily typed if SAFE
 735                                  * to do so */
 736                                 if (!(isalnum(*p) || *p == ' ' || *p == '=' || *p == ',')) {
 737                                         break;
 738                                 }
 739                         }
 740                         if (*p) {
 741                                 escaped = rfc1738_escape_part(mod_msg, casefold_dn);
 742                                 if (!escaped) {
 743                                         return ldb_oom(ldb);
 744                                 }
 745                                 filename = talloc_asprintf(mod_msg, "%s.d/%s.ldb", sam_name, escaped);
 746                                 talloc_free(escaped);
 747                         } else {
 748                                 filename = talloc_asprintf(mod_msg, "%s.d/%s.ldb", sam_name, casefold_dn);
 749                         }
 750
 751                         if (!filename) {
 752                                 return ldb_oom(ldb);
 753                         }
 754                 }
 755                 partition_record = talloc_asprintf(mod_msg, "%s:%s", casefold_dn, filename);
 756
 757                 ret = ldb_msg_add_steal_string(mod_msg, DSDB_PARTITION_ATTR, partition_record);
 758                 if (ret != LDB_SUCCESS) {
 759                         return ret;
 760                 }
 761
 762                 /* Perform modify on @PARTITION record */
 763                 ret = ldb_build_mod_req(&mod_req, ldb, req, mod_msg, NULL, NULL,
 764                                         ldb_op_default_callback, req);
 765                 LDB_REQ_SET_LOCATION(mod_req);
 766                 if (ret != LDB_SUCCESS) {
 767                         return ret;
 768                 }
 769
 770                 last_req = mod_req;
 771
 772                 ret = ldb_next_request(module, mod_req);
 773                 if (ret == LDB_SUCCESS) {
 774                         ret = ldb_wait(mod_req->handle, LDB_WAIT_ALL);
 775                 }
 776
 777                 if (ret != LDB_SUCCESS) {
 778                         return ret;
 779                 }
 780
 781                 /* Make a partition structure for this new partition, so we can copy in the template structure */
 782                 ret = new_partition_from_dn(ldb, data, req, ldb_dn_copy(req, dn), filename, &partition);
 783                 if (ret != LDB_SUCCESS) {
 784                         return ret;
 785                 }
 786                 talloc_steal(partition, partition_record);
 787                 partition->orig_record = data_blob_string_const(partition_record);
 788         }
 789
 790         ret = new_partition_set_replicated_metadata(ldb, module, last_req, data, partition);
 791         if (ret != LDB_SUCCESS) {
 792                 return ret;
 793         }
 794
 795         if (new_partition) {
 796                 ret = add_partition_to_data(ldb, data, partition);
 797                 if (ret != LDB_SUCCESS) {
 798                         return ret;
 799                 }
 800         }
 801
 802         /* send request done */
 803         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
 804 }
 805
 806
 807 int partition_init(struct ldb_module *module)
 808 {
 809         int ret;
 810         TALLOC_CTX *mem_ctx = talloc_new(module);
 811         struct ldb_context *ldb = ldb_module_get_ctx(module);
 812         struct partition_private_data *data;
 813
 814         if (!mem_ctx) {
 815                 return ldb_operr(ldb);
 816         }
 817
 818         data = talloc_zero(mem_ctx, struct partition_private_data);
 819         if (data == NULL) {
 820                 return ldb_operr(ldb);
 821         }
 822
 823         /* When used from Samba4, this message is set by the samba4
 824          * module, as a fixed value not read from the DB.  This avoids
 825          * listing modules in the DB */
 826         data->forced_module_msg = talloc_get_type(
 827                 ldb_get_opaque(ldb,
 828                                DSDB_OPAQUE_PARTITION_MODULE_MSG_OPAQUE_NAME),
 829                 struct ldb_message);
 830
 831         /* This loads the partitions */
 832         ret = partition_reload_if_required(module, data, NULL);
 833         if (ret != LDB_SUCCESS) {
 834                 return ret;
 835         }
 836
 837         ldb_module_set_private(module, talloc_steal(module, data));
 838         talloc_free(mem_ctx);
 839
 840         ret = ldb_mod_register_control(module, LDB_CONTROL_DOMAIN_SCOPE_OID);
 841         if (ret != LDB_SUCCESS) {
 842                 ldb_debug(ldb, LDB_DEBUG_ERROR,
 843                         "partition: Unable to register control with rootdse!\n");
 844                 return ldb_operr(ldb);
 845         }
 846
 847         ret = ldb_mod_register_control(module, LDB_CONTROL_SEARCH_OPTIONS_OID);
 848         if (ret != LDB_SUCCESS) {
 849                 ldb_debug(ldb, LDB_DEBUG_ERROR,
 850                         "partition: Unable to register control with rootdse!\n");
 851                 return ldb_operr(ldb);
 852         }
 853
 854         return ldb_next_init(module);
 855 }