source4/dsdb/samdb/ldb_modules/rootdse.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    rootDSE ldb module
   5
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Simo Sorce 2005-2008
   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 #include "includes.h"
  24 #include "lib/ldb/include/ldb.h"
  25 #include "lib/ldb/include/ldb_module.h"
  26 #include "system/time.h"
  27 #include "dsdb/samdb/samdb.h"
  28 #include "version.h"
  29 #include "dsdb/samdb/ldb_modules/util.h"
  30 #include "libcli/security/security.h"
  31 #include "librpc/ndr/libndr.h"
  32 #include "auth/auth.h"
  33 #include "param/param.h"
  34 #include "lib/messaging/irpc.h"
  35 #include "librpc/gen_ndr/ndr_irpc_c.h"
  36
  37 struct private_data {
  38         unsigned int num_controls;
  39         char **controls;
  40         unsigned int num_partitions;
  41         struct ldb_dn **partitions;
  42 };
  43
  44 /*
  45   return 1 if a specific attribute has been requested
  46 */
  47 static int do_attribute(const char * const *attrs, const char *name)
  48 {
  49         return attrs == NULL ||
  50                 ldb_attr_in_list(attrs, name) ||
  51                 ldb_attr_in_list(attrs, "*");
  52 }
  53
  54 static int do_attribute_explicit(const char * const *attrs, const char *name)
  55 {
  56         return attrs != NULL && ldb_attr_in_list(attrs, name);
  57 }
  58
  59
  60 /*
  61   expand a DN attribute to include extended DN information if requested
  62  */
  63 static int expand_dn_in_message(struct ldb_module *module, struct ldb_message *msg,
  64                                 const char *attrname, struct ldb_control *edn_control,
  65                                 struct ldb_request *req)
  66 {
  67         struct ldb_dn *dn, *dn2;
  68         struct ldb_val *v;
  69         int ret;
  70         struct ldb_request *req2;
  71         char *dn_string;
  72         const char *no_attrs[] = { NULL };
  73         struct ldb_result *res;
  74         struct ldb_extended_dn_control *edn;
  75         TALLOC_CTX *tmp_ctx = talloc_new(req);
  76         struct ldb_context *ldb;
  77         int edn_type = 0;
  78
  79         ldb = ldb_module_get_ctx(module);
  80
  81         edn = talloc_get_type(edn_control->data, struct ldb_extended_dn_control);
  82         if (edn) {
  83                 edn_type = edn->type;
  84         }
  85
  86         v = discard_const_p(struct ldb_val, ldb_msg_find_ldb_val(msg, attrname));
  87         if (v == NULL) {
  88                 talloc_free(tmp_ctx);
  89                 return LDB_SUCCESS;
  90         }
  91
  92         dn_string = talloc_strndup(tmp_ctx, (const char *)v->data, v->length);
  93         if (dn_string == NULL) {
  94                 talloc_free(tmp_ctx);
  95                 return ldb_operr(ldb);
  96         }
  97
  98         res = talloc_zero(tmp_ctx, struct ldb_result);
  99         if (res == NULL) {
 100                 talloc_free(tmp_ctx);
 101                 return ldb_operr(ldb);
 102         }
 103
 104         dn = ldb_dn_new(tmp_ctx, ldb, dn_string);
 105         if (!ldb_dn_validate(dn)) {
 106                 talloc_free(tmp_ctx);
 107                 return ldb_operr(ldb);
 108         }
 109
 110         ret = ldb_build_search_req(&req2, ldb, tmp_ctx,
 111                                    dn,
 112                                    LDB_SCOPE_BASE,
 113                                    NULL,
 114                                    no_attrs,
 115                                    NULL,
 116                                    res, ldb_search_default_callback,
 117                                    req);
 118         if (ret != LDB_SUCCESS) {
 119                 talloc_free(tmp_ctx);
 120                 return ret;
 121         }
 122
 123
 124         ret = ldb_request_add_control(req2,
 125                                       LDB_CONTROL_EXTENDED_DN_OID,
 126                                       edn_control->critical, edn);
 127         if (ret != LDB_SUCCESS) {
 128                 talloc_free(tmp_ctx);
 129                 return ret;
 130         }
 131
 132         ret = ldb_next_request(module, req2);
 133         if (ret == LDB_SUCCESS) {
 134                 ret = ldb_wait(req2->handle, LDB_WAIT_ALL);
 135         }
 136         if (ret != LDB_SUCCESS) {
 137                 talloc_free(tmp_ctx);
 138                 return ret;
 139         }
 140
 141         if (!res || res->count != 1) {
 142                 talloc_free(tmp_ctx);
 143                 return ldb_operr(ldb);
 144         }
 145
 146         dn2 = res->msgs[0]->dn;
 147
 148         v->data = (uint8_t *)ldb_dn_get_extended_linearized(msg->elements, dn2, edn_type);
 149         if (v->data == NULL) {
 150                 talloc_free(tmp_ctx);
 151                 return ldb_operr(ldb);
 152         }
 153         v->length = strlen((char *)v->data);
 154
 155
 156         talloc_free(tmp_ctx);
 157
 158         return LDB_SUCCESS;
 159 }
 160
 161
 162 /*
 163   add dynamically generated attributes to rootDSE result
 164 */
 165 static int rootdse_add_dynamic(struct ldb_module *module, struct ldb_message *msg,
 166                                const char * const *attrs, struct ldb_request *req)
 167 {
 168         struct ldb_context *ldb;
 169         struct private_data *priv = talloc_get_type(ldb_module_get_private(module), struct private_data);
 170         char **server_sasl;
 171         const struct dsdb_schema *schema;
 172         int *val;
 173         struct ldb_control *edn_control;
 174         const char *dn_attrs[] = {
 175                 "configurationNamingContext",
 176                 "defaultNamingContext",
 177                 "dsServiceName",
 178                 "rootDomainNamingContext",
 179                 "schemaNamingContext",
 180                 "serverName",
 181                 NULL
 182         };
 183
 184         ldb = ldb_module_get_ctx(module);
 185         schema = dsdb_get_schema(ldb, NULL);
 186
 187         msg->dn = ldb_dn_new(msg, ldb, NULL);
 188
 189         /* don't return the distinguishedName, cn and name attributes */
 190         ldb_msg_remove_attr(msg, "distinguishedName");
 191         ldb_msg_remove_attr(msg, "cn");
 192         ldb_msg_remove_attr(msg, "name");
 193
 194         if (do_attribute(attrs, "serverName")) {
 195                 if (ldb_msg_add_linearized_dn(msg, "serverName",
 196                         samdb_server_dn(ldb, msg)) != LDB_SUCCESS) {
 197                         goto failed;
 198                 }
 199         }
 200
 201         if (do_attribute(attrs, "dnsHostName")) {
 202                 if (ldb_msg_add_string(msg, "dnsHostName",
 203                         samdb_search_string(ldb, msg, samdb_server_dn(ldb, msg),
 204                                             "dNSHostName", NULL)) != LDB_SUCCESS) {
 205                         goto failed;
 206                 }
 207         }
 208
 209         if (do_attribute(attrs, "ldapServiceName")) {
 210                 struct loadparm_context *lp_ctx
 211                         = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
 212                                           struct loadparm_context);
 213                 char *ldap_service_name, *hostname;
 214
 215                 hostname = talloc_strdup(msg, lpcfg_netbios_name(lp_ctx));
 216                 if (hostname == NULL) {
 217                         goto failed;
 218                 }
 219                 strlower_m(hostname);
 220
 221                 ldap_service_name = talloc_asprintf(msg, "%s:%s$@%s",
 222                                                     samdb_forest_name(ldb, msg),
 223                                                     hostname, lpcfg_realm(lp_ctx));
 224                 if (ldap_service_name == NULL) {
 225                         goto failed;
 226                 }
 227
 228                 if (ldb_msg_add_string(msg, "ldapServiceName",
 229                                        ldap_service_name) != LDB_SUCCESS) {
 230                         goto failed;
 231                 }
 232         }
 233
 234         if (do_attribute(attrs, "currentTime")) {
 235                 if (ldb_msg_add_steal_string(msg, "currentTime",
 236                                              ldb_timestring(msg, time(NULL))) != LDB_SUCCESS) {
 237                         goto failed;
 238                 }
 239         }
 240
 241         if (priv && do_attribute(attrs, "supportedControl")) {
 242                 unsigned int i;
 243                 for (i = 0; i < priv->num_controls; i++) {
 244                         char *control = talloc_strdup(msg, priv->controls[i]);
 245                         if (!control) {
 246                                 goto failed;
 247                         }
 248                         if (ldb_msg_add_steal_string(msg, "supportedControl",
 249                                                      control) != LDB_SUCCESS) {
 250                                 goto failed;
 251                         }
 252                 }
 253         }
 254
 255         if (priv && do_attribute(attrs, "namingContexts")) {
 256                 unsigned int i;
 257                 for (i = 0; i < priv->num_partitions; i++) {
 258                         struct ldb_dn *dn = priv->partitions[i];
 259                         if (ldb_msg_add_steal_string(msg, "namingContexts",
 260                                                      ldb_dn_alloc_linearized(msg, dn)) != LDB_SUCCESS) {
 261                                 goto failed;
 262                         }
 263                 }
 264         }
 265
 266         server_sasl = talloc_get_type(ldb_get_opaque(ldb, "supportedSASLMechanisms"),
 267                                        char *);
 268         if (server_sasl && do_attribute(attrs, "supportedSASLMechanisms")) {
 269                 unsigned int i;
 270                 for (i = 0; server_sasl && server_sasl[i]; i++) {
 271                         char *sasl_name = talloc_strdup(msg, server_sasl[i]);
 272                         if (!sasl_name) {
 273                                 goto failed;
 274                         }
 275                         if (ldb_msg_add_steal_string(msg, "supportedSASLMechanisms",
 276                                                      sasl_name) != LDB_SUCCESS) {
 277                                 goto failed;
 278                         }
 279                 }
 280         }
 281
 282         if (do_attribute(attrs, "highestCommittedUSN")) {
 283                 uint64_t seq_num;
 284                 int ret = ldb_sequence_number(ldb, LDB_SEQ_HIGHEST_SEQ, &seq_num);
 285                 if (ret == LDB_SUCCESS) {
 286                         if (ldb_msg_add_fmt(msg, "highestCommittedUSN",
 287                                             "%llu", (unsigned long long)seq_num) != LDB_SUCCESS) {
 288                                 goto failed;
 289                         }
 290                 }
 291         }
 292
 293         if (schema && do_attribute_explicit(attrs, "dsSchemaAttrCount")) {
 294                 struct dsdb_attribute *cur;
 295                 unsigned int n = 0;
 296
 297                 for (cur = schema->attributes; cur; cur = cur->next) {
 298                         n++;
 299                 }
 300
 301                 if (ldb_msg_add_fmt(msg, "dsSchemaAttrCount",
 302                                     "%u", n) != LDB_SUCCESS) {
 303                         goto failed;
 304                 }
 305         }
 306
 307         if (schema && do_attribute_explicit(attrs, "dsSchemaClassCount")) {
 308                 struct dsdb_class *cur;
 309                 unsigned int n = 0;
 310
 311                 for (cur = schema->classes; cur; cur = cur->next) {
 312                         n++;
 313                 }
 314
 315                 if (ldb_msg_add_fmt(msg, "dsSchemaClassCount",
 316                                     "%u", n) != LDB_SUCCESS) {
 317                         goto failed;
 318                 }
 319         }
 320
 321         if (schema && do_attribute_explicit(attrs, "dsSchemaPrefixCount")) {
 322                 if (ldb_msg_add_fmt(msg, "dsSchemaPrefixCount",
 323                                     "%u", schema->prefixmap->length) != LDB_SUCCESS) {
 324                         goto failed;
 325                 }
 326         }
 327
 328         if (do_attribute_explicit(attrs, "validFSMOs")) {
 329                 const struct dsdb_naming_fsmo *naming_fsmo;
 330                 const struct dsdb_pdc_fsmo *pdc_fsmo;
 331                 const char *dn_str;
 332
 333                 if (schema && schema->fsmo.we_are_master) {
 334                         dn_str = ldb_dn_get_linearized(ldb_get_schema_basedn(ldb));
 335                         if (dn_str && dn_str[0]) {
 336                                 if (ldb_msg_add_fmt(msg, "validFSMOs", "%s", dn_str) != LDB_SUCCESS) {
 337                                         goto failed;
 338                                 }
 339                         }
 340                 }
 341
 342                 naming_fsmo = talloc_get_type(ldb_get_opaque(ldb, "dsdb_naming_fsmo"),
 343                                               struct dsdb_naming_fsmo);
 344                 if (naming_fsmo && naming_fsmo->we_are_master) {
 345                         dn_str = ldb_dn_get_linearized(samdb_partitions_dn(ldb, msg));
 346                         if (dn_str && dn_str[0]) {
 347                                 if (ldb_msg_add_fmt(msg, "validFSMOs", "%s", dn_str) != LDB_SUCCESS) {
 348                                         goto failed;
 349                                 }
 350                         }
 351                 }
 352
 353                 pdc_fsmo = talloc_get_type(ldb_get_opaque(ldb, "dsdb_pdc_fsmo"),
 354                                            struct dsdb_pdc_fsmo);
 355                 if (pdc_fsmo && pdc_fsmo->we_are_master) {
 356                         dn_str = ldb_dn_get_linearized(ldb_get_default_basedn(ldb));
 357                         if (dn_str && dn_str[0]) {
 358                                 if (ldb_msg_add_fmt(msg, "validFSMOs", "%s", dn_str) != LDB_SUCCESS) {
 359                                         goto failed;
 360                                 }
 361                         }
 362                 }
 363         }
 364
 365         if (do_attribute_explicit(attrs, "vendorVersion")) {
 366                 if (ldb_msg_add_fmt(msg, "vendorVersion",
 367                                     "%s", SAMBA_VERSION_STRING) != LDB_SUCCESS) {
 368                         goto failed;
 369                 }
 370         }
 371
 372         if (do_attribute(attrs, "domainFunctionality")) {
 373                 if (ldb_msg_add_fmt(msg, "domainFunctionality",
 374                                     "%d", dsdb_functional_level(ldb)) != LDB_SUCCESS) {
 375                         goto failed;
 376                 }
 377         }
 378
 379         if (do_attribute(attrs, "forestFunctionality")
 380             && (val = talloc_get_type(ldb_get_opaque(ldb, "forestFunctionality"), int))) {
 381                 if (ldb_msg_add_fmt(msg, "forestFunctionality",
 382                                     "%d", *val) != LDB_SUCCESS) {
 383                         goto failed;
 384                 }
 385         }
 386
 387         if (do_attribute(attrs, "domainControllerFunctionality")
 388             && (val = talloc_get_type(ldb_get_opaque(ldb, "domainControllerFunctionality"), int))) {
 389                 if (ldb_msg_add_fmt(msg, "domainControllerFunctionality",
 390                                     "%d", *val) != LDB_SUCCESS) {
 391                         goto failed;
 392                 }
 393         }
 394
 395         if (do_attribute(attrs, "isGlobalCatalogReady")) {
 396                 /* MS-ADTS 3.1.1.3.2.10
 397                    Note, we should only return true here is we have
 398                    completed at least one synchronisation. As both
 399                    provision and vampire do a full sync, this means we
 400                    can return true is the gc bit is set in the NTDSDSA
 401                    options */
 402                 if (ldb_msg_add_fmt(msg, "isGlobalCatalogReady",
 403                                     "%s", samdb_is_gc(ldb)?"TRUE":"FALSE") != LDB_SUCCESS) {
 404                         goto failed;
 405                 }
 406         }
 407
 408         if (do_attribute_explicit(attrs, "tokenGroups")) {
 409                 unsigned int i;
 410                 /* Obtain the user's session_info */
 411                 struct auth_session_info *session_info
 412                         = (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
 413                 if (session_info && session_info->security_token) {
 414                         /* The list of groups this user is in */
 415                         for (i = 0; i < session_info->security_token->num_sids; i++) {
 416                                 if (samdb_msg_add_dom_sid(ldb, msg, msg,
 417                                                           "tokenGroups",
 418                                                           &session_info->security_token->sids[i]) != LDB_SUCCESS) {
 419                                         goto failed;
 420                                 }
 421                         }
 422                 }
 423         }
 424
 425         /* TODO: lots more dynamic attributes should be added here */
 426
 427         edn_control = ldb_request_get_control(req, LDB_CONTROL_EXTENDED_DN_OID);
 428
 429         /* if the client sent us the EXTENDED_DN control then we need
 430            to expand the DNs to have GUID and SID. W2K8 join relies on
 431            this */
 432         if (edn_control) {
 433                 unsigned int i;
 434                 int ret;
 435                 for (i=0; dn_attrs[i]; i++) {
 436                         if (!do_attribute(attrs, dn_attrs[i])) continue;
 437                         ret = expand_dn_in_message(module, msg, dn_attrs[i],
 438                                                    edn_control, req);
 439                         if (ret != LDB_SUCCESS) {
 440                                 DEBUG(0,(__location__ ": Failed to expand DN in rootDSE for %s\n",
 441                                          dn_attrs[i]));
 442                                 goto failed;
 443                         }
 444                 }
 445         }
 446
 447         return LDB_SUCCESS;
 448
 449 failed:
 450         return ldb_operr(ldb);
 451 }
 452
 453 /*
 454   handle search requests
 455 */
 456
 457 struct rootdse_context {
 458         struct ldb_module *module;
 459         struct ldb_request *req;
 460 };
 461
 462 static struct rootdse_context *rootdse_init_context(struct ldb_module *module,
 463                                                     struct ldb_request *req)
 464 {
 465         struct ldb_context *ldb;
 466         struct rootdse_context *ac;
 467
 468         ldb = ldb_module_get_ctx(module);
 469
 470         ac = talloc_zero(req, struct rootdse_context);
 471         if (ac == NULL) {
 472                 ldb_set_errstring(ldb, "Out of Memory");
 473                 return NULL;
 474         }
 475
 476         ac->module = module;
 477         ac->req = req;
 478
 479         return ac;
 480 }
 481
 482 static int rootdse_callback(struct ldb_request *req, struct ldb_reply *ares)
 483 {
 484         struct rootdse_context *ac;
 485         int ret;
 486
 487         ac = talloc_get_type(req->context, struct rootdse_context);
 488
 489         if (!ares) {
 490                 return ldb_module_done(ac->req, NULL, NULL,
 491                                         LDB_ERR_OPERATIONS_ERROR);
 492         }
 493         if (ares->error != LDB_SUCCESS) {
 494                 return ldb_module_done(ac->req, ares->controls,
 495                                         ares->response, ares->error);
 496         }
 497
 498         switch (ares->type) {
 499         case LDB_REPLY_ENTRY:
 500                 /*
 501                  * if the client explicit asks for the 'netlogon' attribute
 502                  * the reply_entry needs to be skipped
 503                  */
 504                 if (ac->req->op.search.attrs &&
 505                     ldb_attr_in_list(ac->req->op.search.attrs, "netlogon")) {
 506                         talloc_free(ares);
 507                         return LDB_SUCCESS;
 508                 }
 509
 510                 /* for each record returned post-process to add any dynamic
 511                    attributes that have been asked for */
 512                 ret = rootdse_add_dynamic(ac->module, ares->message,
 513                                           ac->req->op.search.attrs, ac->req);
 514                 if (ret != LDB_SUCCESS) {
 515                         talloc_free(ares);
 516                         return ldb_module_done(ac->req, NULL, NULL, ret);
 517                 }
 518
 519                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
 520
 521         case LDB_REPLY_REFERRAL:
 522                 /* should we allow the backend to return referrals in this case
 523                  * ?? */
 524                 break;
 525
 526         case LDB_REPLY_DONE:
 527                 return ldb_module_done(ac->req, ares->controls,
 528                                         ares->response, ares->error);
 529         }
 530
 531         talloc_free(ares);
 532         return LDB_SUCCESS;
 533 }
 534
 535 /*
 536   mark our registered controls as non-critical in the request
 537
 538   This is needed as clients may mark controls as critical even if they
 539   are not needed at all in a request. For example, the centrify client
 540   sets the SD_FLAGS control as critical on ldap modify requests which
 541   are setting the dNSHostName attribute on the machine account. That
 542   request doesn't need SD_FLAGS at all, but centrify adds it on all
 543   ldap requests.
 544  */
 545 static void rootdse_mark_noncritical(struct ldb_module *module, struct ldb_control **controls)
 546 {
 547         unsigned int i, j;
 548         struct private_data *priv = talloc_get_type(ldb_module_get_private(module), struct private_data);
 549
 550         if (!controls) return;
 551
 552         for (i=0; controls[i]; i++) {
 553                 if (controls[i]->critical == 0) {
 554                         continue;
 555                 }
 556                 for (j=0; j<priv->num_controls; j++) {
 557                         if (strcasecmp(priv->controls[j], controls[i]->oid) == 0) {
 558                                 controls[i]->critical = 0;
 559                         }
 560                 }
 561         }
 562 }
 563
 564 static int rootdse_search(struct ldb_module *module, struct ldb_request *req)
 565 {
 566         struct ldb_context *ldb;
 567         struct rootdse_context *ac;
 568         struct ldb_request *down_req;
 569         int ret;
 570
 571         rootdse_mark_noncritical(module, req->controls);
 572
 573         ldb = ldb_module_get_ctx(module);
 574
 575         /* see if its for the rootDSE - only a base search on the "" DN qualifies */
 576         if (!(req->op.search.scope == LDB_SCOPE_BASE && ldb_dn_is_null(req->op.search.base))) {
 577                 /* Otherwise, pass down to the rest of the stack */
 578                 return ldb_next_request(module, req);
 579         }
 580
 581         ac = rootdse_init_context(module, req);
 582         if (ac == NULL) {
 583                 return ldb_operr(ldb);
 584         }
 585
 586         /* in our db we store the rootDSE with a DN of @ROOTDSE */
 587         ret = ldb_build_search_req(&down_req, ldb, ac,
 588                                         ldb_dn_new(ac, ldb, "@ROOTDSE"),
 589                                         LDB_SCOPE_BASE,
 590                                         NULL,
 591                                         req->op.search.attrs,
 592                                         NULL,/* for now skip the controls from the client */
 593                                         ac, rootdse_callback,
 594                                         req);
 595         if (ret != LDB_SUCCESS) {
 596                 return ret;
 597         }
 598
 599         return ldb_next_request(module, down_req);
 600 }
 601
 602 static int rootdse_register_control(struct ldb_module *module, struct ldb_request *req)
 603 {
 604         struct private_data *priv = talloc_get_type(ldb_module_get_private(module), struct private_data);
 605         char **list;
 606
 607         list = talloc_realloc(priv, priv->controls, char *, priv->num_controls + 1);
 608         if (!list) {
 609                 return ldb_oom(ldb_module_get_ctx(module));
 610         }
 611
 612         list[priv->num_controls] = talloc_strdup(list, req->op.reg_control.oid);
 613         if (!list[priv->num_controls]) {
 614                 return ldb_oom(ldb_module_get_ctx(module));
 615         }
 616
 617         priv->num_controls += 1;
 618         priv->controls = list;
 619
 620         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
 621 }
 622
 623 static int rootdse_register_partition(struct ldb_module *module, struct ldb_request *req)
 624 {
 625         struct private_data *priv = talloc_get_type(ldb_module_get_private(module), struct private_data);
 626         struct ldb_dn **list;
 627
 628         list = talloc_realloc(priv, priv->partitions, struct ldb_dn *, priv->num_partitions + 1);
 629         if (!list) {
 630                 return ldb_oom(ldb_module_get_ctx(module));
 631         }
 632
 633         list[priv->num_partitions] = ldb_dn_copy(list, req->op.reg_partition.dn);
 634         if (!list[priv->num_partitions]) {
 635                 return ldb_operr(ldb_module_get_ctx(module));
 636         }
 637
 638         priv->num_partitions += 1;
 639         priv->partitions = list;
 640
 641         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
 642 }
 643
 644
 645 static int rootdse_request(struct ldb_module *module, struct ldb_request *req)
 646 {
 647         switch (req->operation) {
 648
 649         case LDB_REQ_REGISTER_CONTROL:
 650                 return rootdse_register_control(module, req);
 651         case LDB_REQ_REGISTER_PARTITION:
 652                 return rootdse_register_partition(module, req);
 653
 654         default:
 655                 break;
 656         }
 657         return ldb_next_request(module, req);
 658 }
 659
 660 static int rootdse_init(struct ldb_module *module)
 661 {
 662         int ret;
 663         struct ldb_context *ldb;
 664         struct ldb_result *res;
 665         struct private_data *data;
 666         const char *attrs[] = { "msDS-Behavior-Version", NULL };
 667         const char *ds_attrs[] = { "dsServiceName", NULL };
 668         TALLOC_CTX *mem_ctx;
 669
 670         ldb = ldb_module_get_ctx(module);
 671
 672         data = talloc_zero(module, struct private_data);
 673         if (data == NULL) {
 674                 return ldb_oom(ldb);
 675         }
 676
 677         data->num_controls = 0;
 678         data->controls = NULL;
 679         data->num_partitions = 0;
 680         data->partitions = NULL;
 681         ldb_module_set_private(module, data);
 682
 683         ldb_set_default_dns(ldb);
 684
 685         ret = ldb_next_init(module);
 686
 687         if (ret != LDB_SUCCESS) {
 688                 return ret;
 689         }
 690
 691         mem_ctx = talloc_new(data);
 692         if (!mem_ctx) {
 693                 return ldb_oom(ldb);
 694         }
 695
 696         /* Now that the partitions are set up, do a search for:
 697            - domainControllerFunctionality
 698            - domainFunctionality
 699            - forestFunctionality
 700
 701            Then stuff these values into an opaque
 702         */
 703         ret = ldb_search(ldb, mem_ctx, &res,
 704                          ldb_get_default_basedn(ldb),
 705                          LDB_SCOPE_BASE, attrs, NULL);
 706         if (ret == LDB_SUCCESS && res->count == 1) {
 707                 int domain_behaviour_version
 708                         = ldb_msg_find_attr_as_int(res->msgs[0],
 709                                                    "msDS-Behavior-Version", -1);
 710                 if (domain_behaviour_version != -1) {
 711                         int *val = talloc(ldb, int);
 712                         if (!val) {
 713                                 talloc_free(mem_ctx);
 714                                 return ldb_oom(ldb);
 715                         }
 716                         *val = domain_behaviour_version;
 717                         ret = ldb_set_opaque(ldb, "domainFunctionality", val);
 718                         if (ret != LDB_SUCCESS) {
 719                                 talloc_free(mem_ctx);
 720                                 return ret;
 721                         }
 722                 }
 723         }
 724
 725         ret = ldb_search(ldb, mem_ctx, &res,
 726                          samdb_partitions_dn(ldb, mem_ctx),
 727                          LDB_SCOPE_BASE, attrs, NULL);
 728         if (ret == LDB_SUCCESS && res->count == 1) {
 729                 int forest_behaviour_version
 730                         = ldb_msg_find_attr_as_int(res->msgs[0],
 731                                                    "msDS-Behavior-Version", -1);
 732                 if (forest_behaviour_version != -1) {
 733                         int *val = talloc(ldb, int);
 734                         if (!val) {
 735                                 talloc_free(mem_ctx);
 736                                 return ldb_oom(ldb);
 737                         }
 738                         *val = forest_behaviour_version;
 739                         ret = ldb_set_opaque(ldb, "forestFunctionality", val);
 740                         if (ret != LDB_SUCCESS) {
 741                                 talloc_free(mem_ctx);
 742                                 return ret;
 743                         }
 744                 }
 745         }
 746
 747         ret = ldb_search(ldb, mem_ctx, &res,
 748                          ldb_dn_new(mem_ctx, ldb, ""),
 749                          LDB_SCOPE_BASE, ds_attrs, NULL);
 750         if (ret == LDB_SUCCESS && res->count == 1) {
 751                 struct ldb_dn *ds_dn
 752                         = ldb_msg_find_attr_as_dn(ldb, mem_ctx, res->msgs[0],
 753                                                   "dsServiceName");
 754                 if (ds_dn) {
 755                         ret = ldb_search(ldb, mem_ctx, &res, ds_dn,
 756                                          LDB_SCOPE_BASE, attrs, NULL);
 757                         if (ret == LDB_SUCCESS && res->count == 1) {
 758                                 int domain_controller_behaviour_version
 759                                         = ldb_msg_find_attr_as_int(res->msgs[0],
 760                                                                    "msDS-Behavior-Version", -1);
 761                                 if (domain_controller_behaviour_version != -1) {
 762                                         int *val = talloc(ldb, int);
 763                                         if (!val) {
 764                                                 talloc_free(mem_ctx);
 765                                                 return ldb_oom(ldb);
 766                                         }
 767                                         *val = domain_controller_behaviour_version;
 768                                         ret = ldb_set_opaque(ldb,
 769                                                              "domainControllerFunctionality", val);
 770                                         if (ret != LDB_SUCCESS) {
 771                                                 talloc_free(mem_ctx);
 772                                                 return ret;
 773                                         }
 774                                 }
 775                         }
 776                 }
 777         }
 778
 779         talloc_free(mem_ctx);
 780
 781         return LDB_SUCCESS;
 782 }
 783
 784 /*
 785  * This function gets the string SCOPE_DN:OPTIONAL_FEATURE_GUID and parse it
 786  * to a DN and a GUID object
 787  */
 788 static int get_optional_feature_dn_guid(struct ldb_request *req, struct ldb_context *ldb,
 789                                                 TALLOC_CTX *mem_ctx,
 790                                                 struct ldb_dn **op_feature_scope_dn,
 791                                                 struct GUID *op_feature_guid)
 792 {
 793         const struct ldb_message *msg = req->op.mod.message;
 794         const char *ldb_val_str;
 795         char *dn, *guid;
 796         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 797         NTSTATUS status;
 798
 799         ldb_val_str = ldb_msg_find_attr_as_string(msg, "enableOptionalFeature", NULL);
 800         if (!ldb_val_str) {
 801                 ldb_set_errstring(ldb,
 802                                   "rootdse: unable to find 'enableOptionalFeature'!");
 803                 return LDB_ERR_UNWILLING_TO_PERFORM;
 804         }
 805
 806         guid = strchr(ldb_val_str, ':');
 807         if (!guid) {
 808                 ldb_set_errstring(ldb,
 809                                   "rootdse: unable to find GUID in 'enableOptionalFeature'!");
 810                 return LDB_ERR_UNWILLING_TO_PERFORM;
 811         }
 812         status = GUID_from_string(guid+1, op_feature_guid);
 813         if (!NT_STATUS_IS_OK(status)) {
 814                 ldb_set_errstring(ldb,
 815                                   "rootdse: bad GUID in 'enableOptionalFeature'!");
 816                 return LDB_ERR_UNWILLING_TO_PERFORM;
 817         }
 818
 819         dn = talloc_strndup(tmp_ctx, ldb_val_str, guid-ldb_val_str);
 820         if (!dn) {
 821                 ldb_set_errstring(ldb,
 822                                   "rootdse: bad DN in 'enableOptionalFeature'!");
 823                 return LDB_ERR_UNWILLING_TO_PERFORM;
 824         }
 825
 826         *op_feature_scope_dn = ldb_dn_new(mem_ctx, ldb, dn);
 827
 828         talloc_free(tmp_ctx);
 829         return LDB_SUCCESS;
 830 }
 831
 832 /*
 833  * This function gets the OPTIONAL_FEATURE_GUID and looks for the optional feature
 834  * ldb_message object.
 835  */
 836 static int dsdb_find_optional_feature(struct ldb_module *module, struct ldb_context *ldb,
 837                                 TALLOC_CTX *mem_ctx, struct GUID op_feature_guid, struct ldb_message **msg)
 838 {
 839         struct ldb_result *res;
 840         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 841         int ret;
 842
 843         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
 844                                 NULL,
 845                                 DSDB_FLAG_NEXT_MODULE |
 846                                 DSDB_SEARCH_SEARCH_ALL_PARTITIONS,
 847                                  "(&(objectClass=msDS-OptionalFeature)"
 848                                  "(msDS-OptionalFeatureGUID=%s))",GUID_string(tmp_ctx, &op_feature_guid));
 849
 850         if (ret != LDB_SUCCESS) {
 851                 talloc_free(tmp_ctx);
 852                 return ret;
 853         }
 854         if (res->count == 0) {
 855                 talloc_free(tmp_ctx);
 856                 return LDB_ERR_NO_SUCH_OBJECT;
 857         }
 858         if (res->count != 1) {
 859                 ldb_asprintf_errstring(ldb,
 860                                        "More than one object found matching optional feature GUID %s\n",
 861                                        GUID_string(tmp_ctx, &op_feature_guid));
 862                 talloc_free(tmp_ctx);
 863                 return LDB_ERR_OPERATIONS_ERROR;
 864         }
 865
 866         *msg = talloc_steal(mem_ctx, res->msgs[0]);
 867
 868         talloc_free(tmp_ctx);
 869         return LDB_SUCCESS;
 870 }
 871
 872 static int rootdse_enable_recycle_bin(struct ldb_module *module,struct ldb_context *ldb,
 873                         TALLOC_CTX *mem_ctx, struct ldb_dn *op_feature_scope_dn,
 874                         struct ldb_message *op_feature_msg)
 875 {
 876         int ret;
 877         const int domain_func_level = dsdb_functional_level(ldb);
 878         struct ldb_dn *ntds_settings_dn;
 879         TALLOC_CTX *tmp_ctx;
 880         unsigned int el_count = 0;
 881         struct ldb_message *msg;
 882
 883         ret = ldb_msg_find_attr_as_int(op_feature_msg, "msDS-RequiredForestBehaviorVersion", 0);
 884         if (domain_func_level < ret){
 885                 ldb_asprintf_errstring(ldb,
 886                                        "rootdse_enable_recycle_bin: Domain functional level must be at least %d\n",
 887                                        ret);
 888                 return LDB_ERR_UNWILLING_TO_PERFORM;
 889         }
 890
 891         tmp_ctx = talloc_new(mem_ctx);
 892         ntds_settings_dn = samdb_ntds_settings_dn(ldb);
 893         if (!ntds_settings_dn) {
 894                 DEBUG(0, (__location__ ": Failed to find NTDS settings DN\n"));
 895                 ret = LDB_ERR_OPERATIONS_ERROR;
 896                 talloc_free(tmp_ctx);
 897                 return ret;
 898         }
 899
 900         ntds_settings_dn = ldb_dn_copy(tmp_ctx, ntds_settings_dn);
 901         if (!ntds_settings_dn) {
 902                 DEBUG(0, (__location__ ": Failed to copy NTDS settings DN\n"));
 903                 ret = LDB_ERR_OPERATIONS_ERROR;
 904                 talloc_free(tmp_ctx);
 905                 return ret;
 906         }
 907
 908         msg = ldb_msg_new(tmp_ctx);
 909         msg->dn = ntds_settings_dn;
 910
 911         ldb_msg_add_linearized_dn(msg, "msDS-EnabledFeature", op_feature_msg->dn);
 912         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
 913
 914         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE);
 915         if (ret != LDB_SUCCESS) {
 916                 ldb_asprintf_errstring(ldb,
 917                                        "rootdse_enable_recycle_bin: Failed to modify object %s - %s",
 918                                        ldb_dn_get_linearized(ntds_settings_dn),
 919                                        ldb_errstring(ldb));
 920                 talloc_free(tmp_ctx);
 921                 return ret;
 922         }
 923
 924         msg->dn = op_feature_scope_dn;
 925         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE);
 926         if (ret != LDB_SUCCESS) {
 927                 ldb_asprintf_errstring(ldb,
 928                                        "rootdse_enable_recycle_bin: Failed to modify object %s - %s",
 929                                        ldb_dn_get_linearized(op_feature_scope_dn),
 930                                        ldb_errstring(ldb));
 931                 talloc_free(tmp_ctx);
 932                 return ret;
 933         }
 934
 935         return LDB_SUCCESS;
 936 }
 937
 938 static int rootdse_enableoptionalfeature(struct ldb_module *module, struct ldb_request *req)
 939 {
 940         /*
 941           steps:
 942                - check for system (only system can enable features)
 943                - extract GUID from the request
 944                - find the feature object
 945                - check functional level, must be at least msDS-RequiredForestBehaviorVersion
 946                - check if it is already enabled (if enabled return LDAP_ATTRIBUTE_OR_VALUE_EXISTS) - probably not needed, just return error from the add/modify
 947                - add/modify objects (see ntdsconnection code for an example)
 948          */
 949
 950         struct ldb_context *ldb = ldb_module_get_ctx(module);
 951         struct GUID op_feature_guid;
 952         struct ldb_dn *op_feature_scope_dn;
 953         struct ldb_message *op_feature_msg;
 954         struct auth_session_info *session_info =
 955                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
 956         TALLOC_CTX *tmp_ctx = talloc_new(ldb);
 957         int ret;
 958         const char *guid_string;
 959
 960         if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
 961                 ldb_set_errstring(ldb, "rootdse: Insufficient rights for enableoptionalfeature");
 962                 return LDB_ERR_UNWILLING_TO_PERFORM;
 963         }
 964
 965         ret = get_optional_feature_dn_guid(req, ldb, tmp_ctx, &op_feature_scope_dn, &op_feature_guid);
 966         if (ret != LDB_SUCCESS) {
 967                 talloc_free(tmp_ctx);
 968                 return ret;
 969         }
 970
 971         guid_string = GUID_string(tmp_ctx, &op_feature_guid);
 972         if (!guid_string) {
 973                 ldb_set_errstring(ldb, "rootdse: bad optional feature GUID");
 974                 return LDB_ERR_UNWILLING_TO_PERFORM;
 975         }
 976
 977         ret = dsdb_find_optional_feature(module, ldb, tmp_ctx, op_feature_guid, &op_feature_msg);
 978         if (ret != LDB_SUCCESS) {
 979                 ldb_asprintf_errstring(ldb,
 980                                        "rootdse: unable to find optional feature for %s - %s",
 981                                        guid_string, ldb_errstring(ldb));
 982                 talloc_free(tmp_ctx);
 983                 return ret;
 984         }
 985
 986         if (strcasecmp(DS_GUID_FEATURE_RECYCLE_BIN, guid_string) == 0) {
 987                         ret = rootdse_enable_recycle_bin(module, ldb,
 988                                                          tmp_ctx, op_feature_scope_dn,
 989                                                          op_feature_msg);
 990         } else {
 991                 ldb_asprintf_errstring(ldb,
 992                                        "rootdse: unknown optional feature %s",
 993                                        guid_string);
 994                 talloc_free(tmp_ctx);
 995                 return LDB_ERR_UNWILLING_TO_PERFORM;
 996         }
 997         if (ret != LDB_SUCCESS) {
 998                 ldb_asprintf_errstring(ldb,
 999                                        "rootdse: failed to set optional feature for %s - %s",
1000                                        guid_string, ldb_errstring(ldb));
1001                 talloc_free(tmp_ctx);
1002                 return ret;
1003         }
1004
1005         talloc_free(tmp_ctx);
1006         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);;
1007 }
1008
1009 static int rootdse_schemaupdatenow(struct ldb_module *module, struct ldb_request *req)
1010 {
1011         struct ldb_context *ldb = ldb_module_get_ctx(module);
1012         struct ldb_result *ext_res;
1013         int ret;
1014         struct ldb_dn *schema_dn;
1015
1016         schema_dn = ldb_get_schema_basedn(ldb);
1017         if (!schema_dn) {
1018                 ldb_reset_err_string(ldb);
1019                 ldb_debug(ldb, LDB_DEBUG_WARNING,
1020                           "rootdse_modify: no schema dn present: (skip ldb_extended call)\n");
1021                 return ldb_next_request(module, req);
1022         }
1023
1024         ret = ldb_extended(ldb, DSDB_EXTENDED_SCHEMA_UPDATE_NOW_OID, schema_dn, &ext_res);
1025         if (ret != LDB_SUCCESS) {
1026                 return ldb_operr(ldb);
1027         }
1028
1029         talloc_free(ext_res);
1030         return ldb_module_done(req, NULL, NULL, ret);
1031 }
1032
1033 static int rootdse_add(struct ldb_module *module, struct ldb_request *req)
1034 {
1035         struct ldb_context *ldb = ldb_module_get_ctx(module);
1036
1037         rootdse_mark_noncritical(module, req->controls);
1038
1039         /*
1040                 If dn is not "" we should let it pass through
1041         */
1042         if (!ldb_dn_is_null(req->op.add.message->dn)) {
1043                 return ldb_next_request(module, req);
1044         }
1045
1046         ldb_set_errstring(ldb, "rootdse_add: you cannot add a new rootdse entry!");
1047         return LDB_ERR_NAMING_VIOLATION;
1048 }
1049
1050 static int rootdse_become_master(struct ldb_module *module,
1051                                  struct ldb_request *req,
1052                                  uint32_t role)
1053 {
1054         struct drepl_takeFSMORole r;
1055         struct messaging_context *msg;
1056         struct ldb_context *ldb = ldb_module_get_ctx(module);
1057         TALLOC_CTX *tmp_ctx = talloc_new(req);
1058         struct loadparm_context *lp_ctx = ldb_get_opaque(ldb, "loadparm");
1059         NTSTATUS status_call;
1060         WERROR status_fn;
1061         struct dcerpc_binding_handle *irpc_handle;
1062
1063         msg = messaging_client_init(tmp_ctx, lpcfg_messaging_path(tmp_ctx, lp_ctx),
1064                                     ldb_get_event_context(ldb));
1065
1066         irpc_handle = irpc_binding_handle_by_name(tmp_ctx, msg,
1067                                                   "dreplsrv",
1068                                                   &ndr_table_irpc);
1069         if (irpc_handle == NULL) {
1070                 return ldb_oom(ldb);
1071         }
1072         r.in.role = role;
1073
1074         status_call = dcerpc_drepl_takeFSMORole_r(irpc_handle, tmp_ctx, &r);
1075         if (!NT_STATUS_IS_OK(status_call)) {
1076                 return LDB_ERR_OPERATIONS_ERROR;
1077         }
1078         status_fn = r.out.result;
1079         if (!W_ERROR_IS_OK(status_fn)) {
1080                 return LDB_ERR_OPERATIONS_ERROR;
1081         }
1082         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
1083 }
1084
1085 static int rootdse_modify(struct ldb_module *module, struct ldb_request *req)
1086 {
1087         struct ldb_context *ldb = ldb_module_get_ctx(module);
1088
1089         rootdse_mark_noncritical(module, req->controls);
1090
1091         /*
1092                 If dn is not "" we should let it pass through
1093         */
1094         if (!ldb_dn_is_null(req->op.mod.message->dn)) {
1095                 return ldb_next_request(module, req);
1096         }
1097
1098         /*
1099                 dn is empty so check for schemaUpdateNow attribute
1100                 "The type of modification and values specified in the LDAP modify operation do not matter." MSDN
1101         */
1102         if (ldb_msg_find_element(req->op.mod.message, "schemaUpdateNow")) {
1103                 return rootdse_schemaupdatenow(module, req);
1104         }
1105         if (ldb_msg_find_element(req->op.mod.message, "becomeDomainMaster")) {
1106                 return rootdse_become_master(module, req, DREPL_NAMING_MASTER);
1107         }
1108         if (ldb_msg_find_element(req->op.mod.message, "becomeInfrastructureMaster")) {
1109                 return rootdse_become_master(module, req, DREPL_INFRASTRUCTURE_MASTER);
1110         }
1111         if (ldb_msg_find_element(req->op.mod.message, "becomeRidMaster")) {
1112                 return rootdse_become_master(module, req, DREPL_RID_MASTER);
1113         }
1114         if (ldb_msg_find_element(req->op.mod.message, "becomeSchemaMaster")) {
1115                 return rootdse_become_master(module, req, DREPL_SCHEMA_MASTER);
1116         }
1117         if (ldb_msg_find_element(req->op.mod.message, "becomePdc")) {
1118                 return rootdse_become_master(module, req, DREPL_PDC_MASTER);
1119         }
1120         if (ldb_msg_find_element(req->op.mod.message, "enableOptionalFeature")) {
1121                 return rootdse_enableoptionalfeature(module, req);
1122         }
1123
1124         ldb_set_errstring(ldb, "rootdse_modify: unknown attribute to change!");
1125         return LDB_ERR_UNWILLING_TO_PERFORM;
1126 }
1127
1128 static int rootdse_delete(struct ldb_module *module, struct ldb_request *req)
1129 {
1130         struct ldb_context *ldb = ldb_module_get_ctx(module);
1131
1132         rootdse_mark_noncritical(module, req->controls);
1133
1134         /*
1135                 If dn is not "" we should let it pass through
1136         */
1137         if (!ldb_dn_is_null(req->op.del.dn)) {
1138                 return ldb_next_request(module, req);
1139         }
1140
1141         ldb_set_errstring(ldb, "rootdse_remove: you cannot delete the rootdse entry!");
1142         return LDB_ERR_NO_SUCH_OBJECT;
1143 }
1144
1145 _PUBLIC_ const struct ldb_module_ops ldb_rootdse_module_ops = {
1146         .name           = "rootdse",
1147         .init_context   = rootdse_init,
1148         .search         = rootdse_search,
1149         .request        = rootdse_request,
1150         .add            = rootdse_add,
1151         .modify         = rootdse_modify,
1152         .del            = rootdse_delete
1153 };