source4/dsdb/samdb/ldb_modules/extended_dn_out.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce 2005-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007-2009
   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 extended dn control module
  25  *
  26  *  Description: this module builds a special dn for returned search
  27  *  results, and fixes some other aspects of the result (returned case issues)
  28  *  values.
  29  *
  30  *  Authors: Simo Sorce
  31  *           Andrew Bartlett
  32  */
  33
  34 #include "includes.h"
  35 #include "ldb/include/ldb.h"
  36 #include "ldb/include/ldb_errors.h"
  37 #include "ldb/include/ldb_module.h"
  38 #include "libcli/security/dom_sid.h"
  39 #include "librpc/gen_ndr/ndr_misc.h"
  40 #include "librpc/gen_ndr/ndr_security.h"
  41 #include "librpc/ndr/libndr.h"
  42 #include "dsdb/samdb/samdb.h"
  43
  44 struct extended_dn_out_private {
  45         bool dereference;
  46         bool normalise;
  47         struct dsdb_openldap_dereference_control *dereference_control;
  48 };
  49
  50 static bool is_attr_in_list(const char * const * attrs, const char *attr)
  51 {
  52         int i;
  53
  54         for (i = 0; attrs[i]; i++) {
  55                 if (ldb_attr_cmp(attrs[i], attr) == 0)
  56                         return true;
  57         }
  58
  59         return false;
  60 }
  61
  62 static char **copy_attrs(void *mem_ctx, const char * const * attrs)
  63 {
  64         char **nattrs;
  65         int i, num;
  66
  67         for (num = 0; attrs[num]; num++);
  68
  69         nattrs = talloc_array(mem_ctx, char *, num + 1);
  70         if (!nattrs) return NULL;
  71
  72         for(i = 0; i < num; i++) {
  73                 nattrs[i] = talloc_strdup(nattrs, attrs[i]);
  74                 if (!nattrs[i]) {
  75                         talloc_free(nattrs);
  76                         return NULL;
  77                 }
  78         }
  79         nattrs[i] = NULL;
  80
  81         return nattrs;
  82 }
  83
  84 static bool add_attrs(void *mem_ctx, char ***attrs, const char *attr)
  85 {
  86         char **nattrs;
  87         int num;
  88
  89         for (num = 0; (*attrs)[num]; num++);
  90
  91         nattrs = talloc_realloc(mem_ctx, *attrs, char *, num + 2);
  92         if (!nattrs) return false;
  93
  94         *attrs = nattrs;
  95
  96         nattrs[num] = talloc_strdup(nattrs, attr);
  97         if (!nattrs[num]) return false;
  98
  99         nattrs[num + 1] = NULL;
 100
 101         return true;
 102 }
 103
 104 /* Fix the DN so that the relative attribute names are in upper case so that the DN:
 105    cn=Adminstrator,cn=users,dc=samba,dc=example,dc=com becomes
 106    CN=Adminstrator,CN=users,DC=samba,DC=example,DC=com
 107 */
 108
 109
 110 static int fix_dn(struct ldb_dn *dn)
 111 {
 112         int i, ret;
 113         char *upper_rdn_attr;
 114
 115         for (i=0; i < ldb_dn_get_comp_num(dn); i++) {
 116                 /* We need the attribute name in upper case */
 117                 upper_rdn_attr = strupper_talloc(dn,
 118                                                  ldb_dn_get_component_name(dn, i));
 119                 if (!upper_rdn_attr) {
 120                         return LDB_ERR_OPERATIONS_ERROR;
 121                 }
 122
 123                 /* And replace it with CN=foo (we need the attribute in upper case */
 124                 ret = ldb_dn_set_component(dn, i, upper_rdn_attr,
 125                                            *ldb_dn_get_component_val(dn, i));
 126                 talloc_free(upper_rdn_attr);
 127                 if (ret != LDB_SUCCESS) {
 128                         return ret;
 129                 }
 130         }
 131         return LDB_SUCCESS;
 132 }
 133
 134 /* Inject the extended DN components, so the DN cn=Adminstrator,cn=users,dc=samba,dc=example,dc=com becomes
 135    <GUID=541203ae-f7d6-47ef-8390-bfcf019f9583>;<SID=S-1-5-21-4177067393-1453636373-93818737-500>;cn=Adminstrator,cn=users,dc=samba,dc=example,dc=com */
 136
 137 static int inject_extended_dn_out(struct ldb_reply *ares,
 138                                   struct ldb_context *ldb,
 139                                   int type,
 140                                   bool remove_guid,
 141                                   bool remove_sid)
 142 {
 143         int ret;
 144         const DATA_BLOB *guid_blob;
 145         const DATA_BLOB *sid_blob;
 146
 147         guid_blob = ldb_msg_find_ldb_val(ares->message, "objectGUID");
 148         sid_blob = ldb_msg_find_ldb_val(ares->message, "objectSID");
 149
 150         if (!guid_blob) {
 151                 ldb_set_errstring(ldb, "Did not find objectGUID to inject into extended DN");
 152                 return LDB_ERR_OPERATIONS_ERROR;
 153         }
 154
 155         ret = ldb_dn_set_extended_component(ares->message->dn, "GUID", guid_blob);
 156         if (ret != LDB_SUCCESS) {
 157                 return ret;
 158         }
 159         if (sid_blob) {
 160                 ret = ldb_dn_set_extended_component(ares->message->dn, "SID", sid_blob);
 161                 if (ret != LDB_SUCCESS) {
 162                         return ret;
 163                 }
 164         }
 165
 166         if (remove_guid) {
 167                 ldb_msg_remove_attr(ares->message, "objectGUID");
 168         }
 169
 170         if (sid_blob && remove_sid) {
 171                 ldb_msg_remove_attr(ares->message, "objectSID");
 172         }
 173
 174         return LDB_SUCCESS;
 175 }
 176
 177 static int handle_dereference_openldap(struct ldb_dn *dn,
 178                               struct dsdb_openldap_dereference_result **dereference_attrs,
 179                               const char *attr, const DATA_BLOB *val)
 180 {
 181         const struct ldb_val *entryUUIDblob, *sid_blob;
 182         struct ldb_message fake_msg; /* easier to use routines that expect an ldb_message */
 183         int j;
 184
 185         fake_msg.num_elements = 0;
 186
 187         /* Look for this attribute in the returned control */
 188         for (j = 0; dereference_attrs && dereference_attrs[j]; j++) {
 189                 struct ldb_val source_dn = data_blob_string_const(dereference_attrs[j]->dereferenced_dn);
 190                 if (ldb_attr_cmp(dereference_attrs[j]->source_attribute, attr) == 0
 191                     && data_blob_cmp(&source_dn, val) == 0) {
 192                         fake_msg.num_elements = dereference_attrs[j]->num_attributes;
 193                         fake_msg.elements = dereference_attrs[j]->attributes;
 194                         break;
 195                 }
 196         }
 197         if (!fake_msg.num_elements) {
 198                 return LDB_SUCCESS;
 199         }
 200         /* Look for an OpenLDAP entryUUID */
 201
 202         entryUUIDblob = ldb_msg_find_ldb_val(&fake_msg, "entryUUID");
 203         if (entryUUIDblob) {
 204                 NTSTATUS status;
 205                 struct ldb_val guid_blob;
 206                 struct GUID guid;
 207
 208                 status = GUID_from_data_blob(entryUUIDblob, &guid);
 209
 210                 if (!NT_STATUS_IS_OK(status)) {
 211                         return LDB_ERR_INVALID_DN_SYNTAX;
 212                 }
 213                 status = GUID_to_ndr_blob(&guid, dn, &guid_blob);
 214                 if (!NT_STATUS_IS_OK(status)) {
 215                         return LDB_ERR_INVALID_DN_SYNTAX;
 216                 }
 217
 218                 ldb_dn_set_extended_component(dn, "GUID", &guid_blob);
 219         }
 220
 221         sid_blob = ldb_msg_find_ldb_val(&fake_msg, "objectSID");
 222
 223         /* Look for the objectSID */
 224         if (sid_blob) {
 225                 ldb_dn_set_extended_component(dn, "SID", sid_blob);
 226         }
 227         return LDB_SUCCESS;
 228 }
 229
 230 static int handle_dereference_fds(struct ldb_dn *dn,
 231                               struct dsdb_openldap_dereference_result **dereference_attrs,
 232                               const char *attr, const DATA_BLOB *val)
 233 {
 234         const struct ldb_val *nsUniqueIdBlob, *sidBlob;
 235         struct ldb_message fake_msg; /* easier to use routines that expect an ldb_message */
 236         int j;
 237
 238         fake_msg.num_elements = 0;
 239
 240         /* Look for this attribute in the returned control */
 241         for (j = 0; dereference_attrs && dereference_attrs[j]; j++) {
 242                 struct ldb_val source_dn = data_blob_string_const(dereference_attrs[j]->dereferenced_dn);
 243                 if (ldb_attr_cmp(dereference_attrs[j]->source_attribute, attr) == 0
 244                     && data_blob_cmp(&source_dn, val) == 0) {
 245                         fake_msg.num_elements = dereference_attrs[j]->num_attributes;
 246                         fake_msg.elements = dereference_attrs[j]->attributes;
 247                         break;
 248                 }
 249         }
 250         if (!fake_msg.num_elements) {
 251                 return LDB_SUCCESS;
 252         }
 253
 254         /* Look for the nsUniqueId */
 255
 256         nsUniqueIdBlob = ldb_msg_find_ldb_val(&fake_msg, "nsUniqueId");
 257         if (nsUniqueIdBlob) {
 258                 NTSTATUS status;
 259                 struct ldb_val guid_blob;
 260                 struct GUID guid;
 261
 262                 status = NS_GUID_from_string((char *)nsUniqueIdBlob->data, &guid);
 263
 264                 if (!NT_STATUS_IS_OK(status)) {
 265                         return LDB_ERR_INVALID_DN_SYNTAX;
 266                 }
 267                 status = GUID_to_ndr_blob(&guid, dn, &guid_blob);
 268                 if (!NT_STATUS_IS_OK(status)) {
 269                         return LDB_ERR_INVALID_DN_SYNTAX;
 270                 }
 271
 272                 ldb_dn_set_extended_component(dn, "GUID", &guid_blob);
 273         }
 274
 275         /* Look for the objectSID */
 276
 277         sidBlob = ldb_msg_find_ldb_val(&fake_msg, "sambaSID");
 278         if (sidBlob) {
 279                 enum ndr_err_code ndr_err;
 280
 281                 struct ldb_val sid_blob;
 282                 struct dom_sid *sid;
 283
 284                 sid = dom_sid_parse_length(NULL, sidBlob);
 285
 286                 if (sid == NULL) {
 287                         return LDB_ERR_INVALID_DN_SYNTAX;
 288                 }
 289
 290                 ndr_err = ndr_push_struct_blob(&sid_blob, NULL, NULL, sid,
 291                                                 (ndr_push_flags_fn_t)ndr_push_dom_sid);
 292                 talloc_free(sid);
 293                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 294                         return LDB_ERR_INVALID_DN_SYNTAX;
 295                 }
 296
 297                 ldb_dn_set_extended_component(dn, "SID", &sid_blob);
 298         }
 299         return LDB_SUCCESS;
 300 }
 301
 302 /* search */
 303 struct extended_search_context {
 304         struct ldb_module *module;
 305         const struct dsdb_schema *schema;
 306         struct ldb_request *req;
 307         bool inject;
 308         bool remove_guid;
 309         bool remove_sid;
 310         int extended_type;
 311 };
 312
 313 static int extended_callback(struct ldb_request *req, struct ldb_reply *ares,
 314                 int (*handle_dereference)(struct ldb_dn *dn,
 315                                 struct dsdb_openldap_dereference_result **dereference_attrs,
 316                                 const char *attr, const DATA_BLOB *val))
 317 {
 318         struct extended_search_context *ac;
 319         struct ldb_control *control;
 320         struct dsdb_openldap_dereference_result_control *dereference_control = NULL;
 321         int ret, i, j;
 322         struct ldb_message *msg = ares->message;
 323         struct extended_dn_out_private *p;
 324         struct ldb_context *ldb;
 325         bool have_reveal_control, checked_reveal_control=false;
 326
 327         ac = talloc_get_type(req->context, struct extended_search_context);
 328         p = talloc_get_type(ldb_module_get_private(ac->module), struct extended_dn_out_private);
 329         ldb = ldb_module_get_ctx(ac->module);
 330         if (!ares) {
 331                 return ldb_module_done(ac->req, NULL, NULL,
 332                                         LDB_ERR_OPERATIONS_ERROR);
 333         }
 334         if (ares->error != LDB_SUCCESS) {
 335                 return ldb_module_done(ac->req, ares->controls,
 336                                         ares->response, ares->error);
 337         }
 338
 339         switch (ares->type) {
 340         case LDB_REPLY_REFERRAL:
 341                 return ldb_module_send_referral(ac->req, ares->referral);
 342
 343         case LDB_REPLY_DONE:
 344                 return ldb_module_done(ac->req, ares->controls,
 345                                         ares->response, LDB_SUCCESS);
 346         case LDB_REPLY_ENTRY:
 347                 break;
 348         }
 349
 350         if (p && p->normalise) {
 351                 ret = fix_dn(ares->message->dn);
 352                 if (ret != LDB_SUCCESS) {
 353                         return ldb_module_done(ac->req, NULL, NULL, ret);
 354                 }
 355         }
 356
 357         if (ac->inject) {
 358                 /* for each record returned post-process to add any derived
 359                    attributes that have been asked for */
 360                 ret = inject_extended_dn_out(ares, ldb,
 361                                              ac->extended_type, ac->remove_guid,
 362                                              ac->remove_sid);
 363                 if (ret != LDB_SUCCESS) {
 364                         return ldb_module_done(ac->req, NULL, NULL, ret);
 365                 }
 366         }
 367
 368         if ((p && p->normalise) || ac->inject) {
 369                 const struct ldb_val *val = ldb_msg_find_ldb_val(ares->message, "distinguishedName");
 370                 if (val) {
 371                         ldb_msg_remove_attr(ares->message, "distinguishedName");
 372                         if (ac->inject) {
 373                                 ret = ldb_msg_add_steal_string(ares->message, "distinguishedName",
 374                                                                ldb_dn_get_extended_linearized(ares->message, ares->message->dn, ac->extended_type));
 375                         } else {
 376                                 ret = ldb_msg_add_linearized_dn(ares->message,
 377                                                                 "distinguishedName",
 378                                                                 ares->message->dn);
 379                         }
 380                         if (ret != LDB_SUCCESS) {
 381                                 ldb_oom(ldb);
 382                                 return LDB_ERR_OPERATIONS_ERROR;
 383                         }
 384                 }
 385         }
 386
 387         if (p && p->dereference) {
 388                 control = ldb_reply_get_control(ares, DSDB_OPENLDAP_DEREFERENCE_CONTROL);
 389
 390                 if (control && control->data) {
 391                         dereference_control = talloc_get_type(control->data, struct dsdb_openldap_dereference_result_control);
 392                 }
 393         }
 394
 395         /* Walk the retruned elements (but only if we have a schema to interpret the list with) */
 396         for (i = 0; ac->schema && i < msg->num_elements; i++) {
 397                 bool make_extended_dn;
 398                 const struct dsdb_attribute *attribute;
 399                 attribute = dsdb_attribute_by_lDAPDisplayName(ac->schema, msg->elements[i].name);
 400                 if (!attribute) {
 401                         continue;
 402                 }
 403
 404                 if (p->normalise) {
 405                         /* If we are also in 'normalise' mode, then
 406                          * fix the attribute names to be in the
 407                          * correct case */
 408                         msg->elements[i].name = talloc_strdup(msg->elements, attribute->lDAPDisplayName);
 409                         if (!msg->elements[i].name) {
 410                                 ldb_oom(ldb);
 411                                 return ldb_module_done(ac->req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 412                         }
 413                 }
 414
 415                 /* distinguishedName has been dealt with above */
 416                 if (ldb_attr_cmp(msg->elements[i].name, "distinguishedName") == 0) {
 417                         continue;
 418                 }
 419
 420                 /* Look to see if this attributeSyntax is a DN */
 421                 if (dsdb_dn_oid_to_format(attribute->syntax->ldap_oid) == DSDB_INVALID_DN) {
 422                         continue;
 423                 }
 424
 425                 make_extended_dn = ac->inject;
 426
 427                 /* Always show plain DN in case of Object(OR-Name) syntax */
 428                 if (make_extended_dn) {
 429                         make_extended_dn = (strcmp(attribute->syntax->ldap_oid, DSDB_SYNTAX_OR_NAME) != 0);
 430                 }
 431
 432                 for (j = 0; j < msg->elements[i].num_values; j++) {
 433                         const char *dn_str;
 434                         struct ldb_dn *dn;
 435                         struct dsdb_dn *dsdb_dn = NULL;
 436                         struct ldb_val *plain_dn = &msg->elements[i].values[j];
 437
 438                         if (!checked_reveal_control) {
 439                                 have_reveal_control =
 440                                         ldb_request_get_control(req, LDB_CONTROL_REVEAL_INTERNALS) != NULL;
 441                                 checked_reveal_control = true;
 442                         }
 443
 444                         /* this is a fast method for detecting deleted
 445                            linked attributes, working on the unparsed
 446                            ldb_val */
 447                         if (dsdb_dn_is_deleted_val(plain_dn) && !have_reveal_control) {
 448                                 /* it's a deleted linked attribute,
 449                                   and we don't have the reveal control */
 450                                 memmove(&msg->elements[i].values[j],
 451                                         &msg->elements[i].values[j+1],
 452                                         (msg->elements[i].num_values-(j+1))*sizeof(struct ldb_val));
 453                                 msg->elements[i].num_values--;
 454                                 j--;
 455                                 continue;
 456                         }
 457
 458
 459                         dsdb_dn = dsdb_dn_parse(msg, ldb, plain_dn, attribute->syntax->ldap_oid);
 460
 461                         if (!dsdb_dn || !ldb_dn_validate(dsdb_dn->dn)) {
 462                                 ldb_asprintf_errstring(ldb,
 463                                                        "could not parse %.*s in %s on %s as a %s DN",
 464                                                        (int)plain_dn->length, plain_dn->data,
 465                                                        msg->elements[i].name, ldb_dn_get_linearized(msg->dn),
 466                                                        attribute->syntax->ldap_oid);
 467                                 talloc_free(dsdb_dn);
 468                                 return ldb_module_done(ac->req, NULL, NULL, LDB_ERR_INVALID_DN_SYNTAX);
 469                         }
 470                         dn = dsdb_dn->dn;
 471
 472                         /* don't let users see the internal extended
 473                            GUID components */
 474                         if (!have_reveal_control) {
 475                                 const char *accept[] = { "GUID", "SID", "WKGUID", NULL };
 476                                 ldb_dn_extended_filter(dn, accept);
 477                         }
 478
 479                         if (p->normalise) {
 480                                 ret = fix_dn(dn);
 481                                 if (ret != LDB_SUCCESS) {
 482                                         talloc_free(dsdb_dn);
 483                                         return ldb_module_done(ac->req, NULL, NULL, ret);
 484                                 }
 485                         }
 486
 487                         /* If we are running in dereference mode (such
 488                          * as against OpenLDAP) then the DN in the msg
 489                          * above does not contain the extended values,
 490                          * and we need to look in the dereference
 491                          * result */
 492
 493                         /* Look for this value in the attribute */
 494
 495                         if (dereference_control) {
 496                                 ret = handle_dereference(dn,
 497                                                          dereference_control->attributes,
 498                                                          msg->elements[i].name,
 499                                                          &msg->elements[i].values[j]);
 500                                 if (ret != LDB_SUCCESS) {
 501                                         talloc_free(dsdb_dn);
 502                                         return ldb_module_done(ac->req, NULL, NULL, ret);
 503                                 }
 504                         }
 505
 506                         if (make_extended_dn) {
 507                                 dn_str = dsdb_dn_get_extended_linearized(msg->elements[i].values,
 508                                                                          dsdb_dn, ac->extended_type);
 509                         } else {
 510                                 dn_str = dsdb_dn_get_linearized(msg->elements[i].values,
 511                                                                 dsdb_dn);
 512                         }
 513
 514                         if (!dn_str) {
 515                                 ldb_oom(ldb);
 516                                 talloc_free(dsdb_dn);
 517                                 return ldb_module_done(ac->req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 518                         }
 519                         msg->elements[i].values[j] = data_blob_string_const(dn_str);
 520                         talloc_free(dsdb_dn);
 521                 }
 522                 if (msg->elements[i].num_values == 0) {
 523                         /* we've deleted all of the values from this
 524                          * element - remove the element */
 525                         memmove(&msg->elements[i],
 526                                 &msg->elements[i+1],
 527                                 (msg->num_elements-(i+1))*sizeof(struct ldb_message_element));
 528                         msg->num_elements--;
 529                         i--;
 530                 }
 531         }
 532         return ldb_module_send_entry(ac->req, msg, ares->controls);
 533 }
 534
 535 static int extended_callback_ldb(struct ldb_request *req, struct ldb_reply *ares)
 536 {
 537         return extended_callback(req, ares, NULL);
 538 }
 539
 540 static int extended_callback_openldap(struct ldb_request *req, struct ldb_reply *ares)
 541 {
 542         return extended_callback(req, ares, handle_dereference_openldap);
 543 }
 544
 545 static int extended_callback_fds(struct ldb_request *req, struct ldb_reply *ares)
 546 {
 547         return extended_callback(req, ares, handle_dereference_fds);
 548 }
 549
 550 static int extended_dn_out_search(struct ldb_module *module, struct ldb_request *req,
 551                 int (*callback)(struct ldb_request *req, struct ldb_reply *ares))
 552 {
 553         struct ldb_control *control;
 554         struct ldb_control *storage_format_control;
 555         struct ldb_extended_dn_control *extended_ctrl = NULL;
 556         struct extended_search_context *ac;
 557         struct ldb_request *down_req;
 558         char **new_attrs;
 559         const char * const *const_attrs;
 560         struct ldb_context *ldb = ldb_module_get_ctx(module);
 561         int ret;
 562
 563         struct extended_dn_out_private *p = talloc_get_type(ldb_module_get_private(module), struct extended_dn_out_private);
 564
 565         /* check if there's an extended dn control */
 566         control = ldb_request_get_control(req, LDB_CONTROL_EXTENDED_DN_OID);
 567         if (control && control->data) {
 568                 extended_ctrl = talloc_get_type(control->data, struct ldb_extended_dn_control);
 569                 if (!extended_ctrl) {
 570                         return LDB_ERR_PROTOCOL_ERROR;
 571                 }
 572         }
 573
 574         /* Look to see if, as we are in 'store DN+GUID+SID' mode, the
 575          * client is after the storage format (to fill in linked
 576          * attributes) */
 577         storage_format_control = ldb_request_get_control(req, DSDB_CONTROL_DN_STORAGE_FORMAT_OID);
 578         if (!control && storage_format_control && storage_format_control->data) {
 579                 extended_ctrl = talloc_get_type(storage_format_control->data, struct ldb_extended_dn_control);
 580                 if (!extended_ctrl) {
 581                         ldb_set_errstring(ldb, "extended_dn_out: extended_ctrl was of the wrong data type");
 582                         return LDB_ERR_PROTOCOL_ERROR;
 583                 }
 584         }
 585
 586         ac = talloc_zero(req, struct extended_search_context);
 587         if (ac == NULL) {
 588                 ldb_oom(ldb);
 589                 return LDB_ERR_OPERATIONS_ERROR;
 590         }
 591
 592         ac->module = module;
 593         ac->schema = dsdb_get_schema(ldb);
 594         ac->req = req;
 595         ac->inject = false;
 596         ac->remove_guid = false;
 597         ac->remove_sid = false;
 598
 599         const_attrs = req->op.search.attrs;
 600
 601         /* We only need to do special processing if we were asked for
 602          * the extended DN, or we are 'store DN+GUID+SID'
 603          * (!dereference) mode.  (This is the normal mode for LDB on
 604          * tdb). */
 605         if (control || (storage_format_control && p && !p->dereference)) {
 606                 ac->inject = true;
 607                 if (extended_ctrl) {
 608                         ac->extended_type = extended_ctrl->type;
 609                 } else {
 610                         ac->extended_type = 0;
 611                 }
 612
 613                 /* check if attrs only is specified, in that case check wether we need to modify them */
 614                 if (req->op.search.attrs && !is_attr_in_list(req->op.search.attrs, "*")) {
 615                         if (! is_attr_in_list(req->op.search.attrs, "objectGUID")) {
 616                                 ac->remove_guid = true;
 617                         }
 618                         if (! is_attr_in_list(req->op.search.attrs, "objectSID")) {
 619                                 ac->remove_sid = true;
 620                         }
 621                         if (ac->remove_guid || ac->remove_sid) {
 622                                 new_attrs = copy_attrs(ac, req->op.search.attrs);
 623                                 if (new_attrs == NULL) {
 624                                         ldb_oom(ldb);
 625                                         return LDB_ERR_OPERATIONS_ERROR;
 626                                 }
 627
 628                                 if (ac->remove_guid) {
 629                                         if (!add_attrs(ac, &new_attrs, "objectGUID"))
 630                                                 return LDB_ERR_OPERATIONS_ERROR;
 631                                 }
 632                                 if (ac->remove_sid) {
 633                                         if (!add_attrs(ac, &new_attrs, "objectSID"))
 634                                                 return LDB_ERR_OPERATIONS_ERROR;
 635                                 }
 636                                 const_attrs = (const char * const *)new_attrs;
 637                         }
 638                 }
 639         }
 640
 641         ret = ldb_build_search_req_ex(&down_req,
 642                                       ldb, ac,
 643                                       req->op.search.base,
 644                                       req->op.search.scope,
 645                                       req->op.search.tree,
 646                                       const_attrs,
 647                                       req->controls,
 648                                       ac, callback,
 649                                       req);
 650         if (ret != LDB_SUCCESS) {
 651                 return ret;
 652         }
 653
 654         /* mark extended DN and storage format controls as done */
 655         if (control) {
 656                 control->critical = 0;
 657         }
 658
 659         if (storage_format_control) {
 660                 storage_format_control->critical = 0;
 661         }
 662
 663         /* Add in dereference control, if we were asked to, we are
 664          * using the 'dereference' mode (such as with an OpenLDAP
 665          * backend) and have the control prepared */
 666         if (control && p && p->dereference && p->dereference_control) {
 667                 ret = ldb_request_add_control(down_req,
 668                                               DSDB_OPENLDAP_DEREFERENCE_CONTROL,
 669                                               false, p->dereference_control);
 670                 if (ret != LDB_SUCCESS) {
 671                         return ret;
 672                 }
 673         }
 674
 675         /* perform the search */
 676         return ldb_next_request(module, down_req);
 677 }
 678
 679 static int extended_dn_out_ldb_search(struct ldb_module *module, struct ldb_request *req)
 680 {
 681         return extended_dn_out_search(module, req, extended_callback_ldb);
 682 }
 683
 684 static int extended_dn_out_openldap_search(struct ldb_module *module, struct ldb_request *req)
 685 {
 686         return extended_dn_out_search(module, req, extended_callback_openldap);
 687 }
 688
 689 static int extended_dn_out_fds_search(struct ldb_module *module, struct ldb_request *req)
 690 {
 691         return extended_dn_out_search(module, req, extended_callback_fds);
 692 }
 693
 694 static int extended_dn_out_ldb_init(struct ldb_module *module)
 695 {
 696         int ret;
 697
 698         struct extended_dn_out_private *p = talloc(module, struct extended_dn_out_private);
 699         struct dsdb_extended_dn_store_format *dn_format;
 700
 701         ldb_module_set_private(module, p);
 702
 703         if (!p) {
 704                 ldb_oom(ldb_module_get_ctx(module));
 705                 return LDB_ERR_OPERATIONS_ERROR;
 706         }
 707
 708         dn_format = talloc(p, struct dsdb_extended_dn_store_format);
 709         if (!dn_format) {
 710                 talloc_free(p);
 711                 ldb_oom(ldb_module_get_ctx(module));
 712                 return LDB_ERR_OPERATIONS_ERROR;
 713         }
 714
 715         dn_format->store_extended_dn_in_ldb = true;
 716         ret = ldb_set_opaque(ldb_module_get_ctx(module), DSDB_EXTENDED_DN_STORE_FORMAT_OPAQUE_NAME, dn_format);
 717         if (ret != LDB_SUCCESS) {
 718                 talloc_free(p);
 719                 return ret;
 720         }
 721
 722         p->dereference = false;
 723         p->normalise = false;
 724
 725         ret = ldb_mod_register_control(module, LDB_CONTROL_EXTENDED_DN_OID);
 726         if (ret != LDB_SUCCESS) {
 727                 ldb_debug(ldb_module_get_ctx(module), LDB_DEBUG_ERROR,
 728                         "extended_dn_out: Unable to register control with rootdse!\n");
 729                 return LDB_ERR_OPERATIONS_ERROR;
 730         }
 731
 732         return ldb_next_init(module);
 733 }
 734
 735 static int extended_dn_out_dereference_init(struct ldb_module *module, const char *attrs[])
 736 {
 737         int ret, i = 0;
 738         struct extended_dn_out_private *p = talloc_zero(module, struct extended_dn_out_private);
 739         struct dsdb_extended_dn_store_format *dn_format;
 740         struct dsdb_openldap_dereference_control *dereference_control;
 741         struct dsdb_attribute *cur;
 742         struct ldb_context *ldb = ldb_module_get_ctx(module);
 743         struct dsdb_schema *schema;
 744
 745         ldb_module_set_private(module, p);
 746
 747         if (!p) {
 748                 ldb_oom(ldb);
 749                 return LDB_ERR_OPERATIONS_ERROR;
 750         }
 751
 752         dn_format = talloc(p, struct dsdb_extended_dn_store_format);
 753         if (!dn_format) {
 754                 talloc_free(p);
 755                 ldb_oom(ldb_module_get_ctx(module));
 756                 return LDB_ERR_OPERATIONS_ERROR;
 757         }
 758
 759         dn_format->store_extended_dn_in_ldb = false;
 760
 761         ret = ldb_set_opaque(ldb_module_get_ctx(module), DSDB_EXTENDED_DN_STORE_FORMAT_OPAQUE_NAME, dn_format);
 762         if (ret != LDB_SUCCESS) {
 763                 talloc_free(p);
 764                 return ret;
 765         }
 766
 767         p->dereference = true;
 768
 769         /* At the moment, servers that need dereference also need the
 770          * DN and attribute names to be normalised */
 771         p->normalise = true;
 772
 773         ret = ldb_mod_register_control(module, LDB_CONTROL_EXTENDED_DN_OID);
 774         if (ret != LDB_SUCCESS) {
 775                 ldb_debug(ldb, LDB_DEBUG_ERROR,
 776                         "extended_dn_out: Unable to register control with rootdse!\n");
 777                 return LDB_ERR_OPERATIONS_ERROR;
 778         }
 779
 780         ret = ldb_next_init(module);
 781
 782         if (ret != LDB_SUCCESS) {
 783                 return ret;
 784         }
 785
 786         schema = dsdb_get_schema(ldb);
 787         if (!schema) {
 788                 /* No schema on this DB (yet) */
 789                 return LDB_SUCCESS;
 790         }
 791
 792         p->dereference_control = dereference_control
 793                 = talloc_zero(p, struct dsdb_openldap_dereference_control);
 794
 795         if (!p->dereference_control) {
 796                 ldb_oom(ldb);
 797                 return LDB_ERR_OPERATIONS_ERROR;
 798         }
 799
 800         for (cur = schema->attributes; cur; cur = cur->next) {
 801                 if (dsdb_dn_oid_to_format(cur->syntax->ldap_oid) == DSDB_INVALID_DN) {
 802                         continue;
 803                 }
 804                 dereference_control->dereference
 805                         = talloc_realloc(p, dereference_control->dereference,
 806                                          struct dsdb_openldap_dereference *, i + 2);
 807                 if (!dereference_control) {
 808                         ldb_oom(ldb);
 809                         return LDB_ERR_OPERATIONS_ERROR;
 810                 }
 811                 dereference_control->dereference[i] = talloc(dereference_control->dereference,
 812                                          struct dsdb_openldap_dereference);
 813                 if (!dereference_control->dereference[i]) {
 814                         ldb_oom(ldb);
 815                         return LDB_ERR_OPERATIONS_ERROR;
 816                 }
 817                 dereference_control->dereference[i]->source_attribute = cur->lDAPDisplayName;
 818                 dereference_control->dereference[i]->dereference_attribute = attrs;
 819                 i++;
 820                 dereference_control->dereference[i] = NULL;
 821         }
 822         return LDB_SUCCESS;
 823 }
 824
 825 static int extended_dn_out_openldap_init(struct ldb_module *module)
 826 {
 827         static const char *attrs[] = {
 828                 "entryUUID",
 829                 "objectSID",
 830                 NULL
 831         };
 832
 833         return extended_dn_out_dereference_init(module, attrs);
 834 }
 835
 836 static int extended_dn_out_fds_init(struct ldb_module *module)
 837 {
 838         static const char *attrs[] = {
 839                 "nsUniqueId",
 840                 "objectSID",
 841                 NULL
 842         };
 843
 844         return extended_dn_out_dereference_init(module, attrs);
 845 }
 846
 847 _PUBLIC_ const struct ldb_module_ops ldb_extended_dn_out_ldb_module_ops = {
 848         .name              = "extended_dn_out_ldb",
 849         .search            = extended_dn_out_ldb_search,
 850         .init_context      = extended_dn_out_ldb_init,
 851 };
 852
 853 _PUBLIC_ const struct ldb_module_ops ldb_extended_dn_out_openldap_module_ops = {
 854         .name              = "extended_dn_out_openldap",
 855         .search            = extended_dn_out_openldap_search,
 856         .init_context      = extended_dn_out_openldap_init,
 857 };
 858
 859 _PUBLIC_ const struct ldb_module_ops ldb_extended_dn_out_fds_module_ops = {
 860         .name              = "extended_dn_out_fds",
 861         .search            = extended_dn_out_fds_search,
 862         .init_context      = extended_dn_out_fds_init,
 863 };