source4/lib/ldb/ldb_tdb/ldb_search.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Andrew Tridgell  2004
   5
   6      ** NOTE! The following LGPL license applies to the ldb
   7      ** library. This does NOT imply that all of Samba is released
   8      ** under the LGPL
   9
  10    This library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 3 of the License, or (at your option) any later version.
  14
  15    This library is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 /*
  25  *  Name: ldb
  26  *
  27  *  Component: ldb search functions
  28  *
  29  *  Description: functions to search ldb+tdb databases
  30  *
  31  *  Author: Andrew Tridgell
  32  */
  33
  34 #include "ldb_includes.h"
  35
  36 #include "ldb_tdb.h"
  37
  38 /*
  39   add one element to a message
  40 */
  41 static int msg_add_element(struct ldb_message *ret,
  42                            const struct ldb_message_element *el,
  43                            int check_duplicates)
  44 {
  45         unsigned int i;
  46         struct ldb_message_element *e2, *elnew;
  47
  48         if (check_duplicates && ldb_msg_find_element(ret, el->name)) {
  49                 /* its already there */
  50                 return 0;
  51         }
  52
  53         e2 = talloc_realloc(ret, ret->elements, struct ldb_message_element, ret->num_elements+1);
  54         if (!e2) {
  55                 return -1;
  56         }
  57         ret->elements = e2;
  58
  59         elnew = &e2[ret->num_elements];
  60
  61         elnew->name = talloc_strdup(ret->elements, el->name);
  62         if (!elnew->name) {
  63                 return -1;
  64         }
  65
  66         if (el->num_values) {
  67                 elnew->values = talloc_array(ret->elements, struct ldb_val, el->num_values);
  68                 if (!elnew->values) {
  69                         return -1;
  70                 }
  71         } else {
  72                 elnew->values = NULL;
  73         }
  74
  75         for (i=0;i<el->num_values;i++) {
  76                 elnew->values[i] = ldb_val_dup(elnew->values, &el->values[i]);
  77                 if (elnew->values[i].length != el->values[i].length) {
  78                         return -1;
  79                 }
  80         }
  81
  82         elnew->num_values = el->num_values;
  83
  84         ret->num_elements++;
  85
  86         return 0;
  87 }
  88
  89 /*
  90   add the special distinguishedName element
  91 */
  92 static int msg_add_distinguished_name(struct ldb_message *msg)
  93 {
  94         struct ldb_message_element el;
  95         struct ldb_val val;
  96         int ret;
  97
  98         el.flags = 0;
  99         el.name = "distinguishedName";
 100         el.num_values = 1;
 101         el.values = &val;
 102         val.data = (uint8_t *)ldb_dn_alloc_linearized(msg, msg->dn);
 103         val.length = strlen((char *)val.data);
 104
 105         ret = msg_add_element(msg, &el, 1);
 106         return ret;
 107 }
 108
 109 /*
 110   add all elements from one message into another
 111  */
 112 static int msg_add_all_elements(struct ldb_module *module, struct ldb_message *ret,
 113                                 const struct ldb_message *msg)
 114 {
 115         struct ldb_context *ldb = module->ldb;
 116         unsigned int i;
 117         int check_duplicates = (ret->num_elements != 0);
 118
 119         if (msg_add_distinguished_name(ret) != 0) {
 120                 return -1;
 121         }
 122
 123         for (i=0;i<msg->num_elements;i++) {
 124                 const struct ldb_schema_attribute *a;
 125                 a = ldb_schema_attribute_by_name(ldb, msg->elements[i].name);
 126                 if (a->flags & LDB_ATTR_FLAG_HIDDEN) {
 127                         continue;
 128                 }
 129                 if (msg_add_element(ret, &msg->elements[i],
 130                                     check_duplicates) != 0) {
 131                         return -1;
 132                 }
 133         }
 134
 135         return 0;
 136 }
 137
 138
 139 /*
 140   pull the specified list of attributes from a message
 141  */
 142 static struct ldb_message *ltdb_pull_attrs(struct ldb_module *module,
 143                                            TALLOC_CTX *mem_ctx,
 144                                            const struct ldb_message *msg,
 145                                            const char * const *attrs)
 146 {
 147         struct ldb_message *ret;
 148         int i;
 149
 150         ret = talloc(mem_ctx, struct ldb_message);
 151         if (!ret) {
 152                 return NULL;
 153         }
 154
 155         ret->dn = ldb_dn_copy(ret, msg->dn);
 156         if (!ret->dn) {
 157                 talloc_free(ret);
 158                 return NULL;
 159         }
 160
 161         ret->num_elements = 0;
 162         ret->elements = NULL;
 163
 164         if (!attrs) {
 165                 if (msg_add_all_elements(module, ret, msg) != 0) {
 166                         talloc_free(ret);
 167                         return NULL;
 168                 }
 169                 return ret;
 170         }
 171
 172         for (i=0;attrs[i];i++) {
 173                 struct ldb_message_element *el;
 174
 175                 if (strcmp(attrs[i], "*") == 0) {
 176                         if (msg_add_all_elements(module, ret, msg) != 0) {
 177                                 talloc_free(ret);
 178                                 return NULL;
 179                         }
 180                         continue;
 181                 }
 182
 183                 if (ldb_attr_cmp(attrs[i], "distinguishedName") == 0) {
 184                         if (msg_add_distinguished_name(ret) != 0) {
 185                                 return NULL;
 186                         }
 187                         continue;
 188                 }
 189
 190                 el = ldb_msg_find_element(msg, attrs[i]);
 191                 if (!el) {
 192                         continue;
 193                 }
 194                 if (msg_add_element(ret, el, 1) != 0) {
 195                         talloc_free(ret);
 196                         return NULL;
 197                 }
 198         }
 199
 200         return ret;
 201 }
 202
 203 /*
 204   search the database for a single simple dn.
 205   return LDB_ERR_NO_SUCH_OBJECT on record-not-found
 206   and LDB_SUCCESS on success
 207 */
 208 int ltdb_search_base(struct ldb_module *module, struct ldb_dn *dn)
 209 {
 210         struct ltdb_private *ltdb = (struct ltdb_private *)module->private_data;
 211         TDB_DATA tdb_key, tdb_data;
 212
 213         if (ldb_dn_is_null(dn)) {
 214                 return LDB_ERR_NO_SUCH_OBJECT;
 215         }
 216
 217         /* form the key */
 218         tdb_key = ltdb_key(module, dn);
 219         if (!tdb_key.dptr) {
 220                 return LDB_ERR_OPERATIONS_ERROR;
 221         }
 222
 223         tdb_data = tdb_fetch(ltdb->tdb, tdb_key);
 224         talloc_free(tdb_key.dptr);
 225         if (!tdb_data.dptr) {
 226                 return LDB_ERR_NO_SUCH_OBJECT;
 227         }
 228
 229         free(tdb_data.dptr);
 230         return LDB_SUCCESS;
 231 }
 232
 233 /*
 234   search the database for a single simple dn, returning all attributes
 235   in a single message
 236
 237   return LDB_ERR_NO_SUCH_OBJECT on record-not-found
 238   and LDB_SUCCESS on success
 239 */
 240 int ltdb_search_dn1(struct ldb_module *module, struct ldb_dn *dn, struct ldb_message *msg)
 241 {
 242         struct ltdb_private *ltdb = (struct ltdb_private *)module->private_data;
 243         int ret;
 244         TDB_DATA tdb_key, tdb_data;
 245
 246         memset(msg, 0, sizeof(*msg));
 247
 248         /* form the key */
 249         tdb_key = ltdb_key(module, dn);
 250         if (!tdb_key.dptr) {
 251                 return LDB_ERR_OPERATIONS_ERROR;
 252         }
 253
 254         tdb_data = tdb_fetch(ltdb->tdb, tdb_key);
 255         talloc_free(tdb_key.dptr);
 256         if (!tdb_data.dptr) {
 257                 return LDB_ERR_NO_SUCH_OBJECT;
 258         }
 259
 260         msg->num_elements = 0;
 261         msg->elements = NULL;
 262
 263         ret = ltdb_unpack_data(module, &tdb_data, msg);
 264         free(tdb_data.dptr);
 265         if (ret == -1) {
 266                 return LDB_ERR_OPERATIONS_ERROR;
 267         }
 268
 269         if (!msg->dn) {
 270                 msg->dn = ldb_dn_copy(msg, dn);
 271         }
 272         if (!msg->dn) {
 273                 return LDB_ERR_OPERATIONS_ERROR;
 274         }
 275
 276         return LDB_SUCCESS;
 277 }
 278
 279 /*
 280   lock the database for read - use by ltdb_search
 281 */
 282 static int ltdb_lock_read(struct ldb_module *module)
 283 {
 284         struct ltdb_private *ltdb = (struct ltdb_private *)module->private_data;
 285         if (ltdb->in_transaction == 0) {
 286                 return tdb_lockall_read(ltdb->tdb);
 287         }
 288         return 0;
 289 }
 290
 291 /*
 292   unlock the database after a ltdb_lock_read()
 293 */
 294 static int ltdb_unlock_read(struct ldb_module *module)
 295 {
 296         struct ltdb_private *ltdb = (struct ltdb_private *)module->private_data;
 297         if (ltdb->in_transaction == 0) {
 298                 return tdb_unlockall_read(ltdb->tdb);
 299         }
 300         return 0;
 301 }
 302
 303 /*
 304   add a set of attributes from a record to a set of results
 305   return 0 on success, -1 on failure
 306 */
 307 int ltdb_add_attr_results(struct ldb_module *module,
 308                           TALLOC_CTX *mem_ctx,
 309                           struct ldb_message *msg,
 310                           const char * const attrs[],
 311                           unsigned int *count,
 312                           struct ldb_message ***res)
 313 {
 314         struct ldb_message *msg2;
 315         struct ldb_message **res2;
 316
 317         /* pull the attributes that the user wants */
 318         msg2 = ltdb_pull_attrs(module, mem_ctx, msg, attrs);
 319         if (!msg2) {
 320                 return -1;
 321         }
 322
 323         /* add to the results list */
 324         res2 = talloc_realloc(mem_ctx, *res, struct ldb_message *, (*count)+2);
 325         if (!res2) {
 326                 talloc_free(msg2);
 327                 return -1;
 328         }
 329
 330         (*res) = res2;
 331
 332         (*res)[*count] = talloc_move(*res, &msg2);
 333         (*res)[(*count)+1] = NULL;
 334         (*count)++;
 335
 336         return 0;
 337 }
 338
 339
 340
 341 /*
 342   filter the specified list of attributes from a message
 343   removing not requested attrs.
 344  */
 345 int ltdb_filter_attrs(struct ldb_message *msg, const char * const *attrs)
 346 {
 347         int i, keep_all = 0;
 348
 349         if (attrs) {
 350                 /* check for special attrs */
 351                 for (i = 0; attrs[i]; i++) {
 352                         if (strcmp(attrs[i], "*") == 0) {
 353                                 keep_all = 1;
 354                                 break;
 355                         }
 356
 357                         if (ldb_attr_cmp(attrs[i], "distinguishedName") == 0) {
 358                                 if (msg_add_distinguished_name(msg) != 0) {
 359                                         return -1;
 360                                 }
 361                         }
 362                 }
 363         } else {
 364                 keep_all = 1;
 365         }
 366
 367         if (keep_all) {
 368                 if (msg_add_distinguished_name(msg) != 0) {
 369                         return -1;
 370                 }
 371                 return 0;
 372         }
 373
 374         for (i = 0; i < msg->num_elements; i++) {
 375                 int j, found;
 376
 377                 for (j = 0, found = 0; attrs[j]; j++) {
 378                         if (ldb_attr_cmp(msg->elements[i].name, attrs[j]) == 0) {
 379                                 found = 1;
 380                                 break;
 381                         }
 382                 }
 383
 384                 if (!found) {
 385                         ldb_msg_remove_attr(msg, msg->elements[i].name);
 386                         i--;
 387                 }
 388         }
 389
 390         return 0;
 391 }
 392
 393 /*
 394   search function for a non-indexed search
 395  */
 396 static int search_func(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data, void *state)
 397 {
 398         struct ltdb_context *ac;
 399         struct ldb_message *msg;
 400         int ret;
 401
 402         ac = talloc_get_type(state, struct ltdb_context);
 403
 404         if (key.dsize < 4 ||
 405             strncmp((char *)key.dptr, "DN=", 3) != 0) {
 406                 return 0;
 407         }
 408
 409         msg = ldb_msg_new(ac);
 410         if (!msg) {
 411                 return -1;
 412         }
 413
 414         /* unpack the record */
 415         ret = ltdb_unpack_data(ac->module, &data, msg);
 416         if (ret == -1) {
 417                 talloc_free(msg);
 418                 return -1;
 419         }
 420
 421         if (!msg->dn) {
 422                 msg->dn = ldb_dn_new(msg, ac->module->ldb,
 423                                      (char *)key.dptr + 3);
 424                 if (msg->dn == NULL) {
 425                         talloc_free(msg);
 426                         return -1;
 427                 }
 428         }
 429
 430         /* see if it matches the given expression */
 431         if (!ldb_match_msg(ac->module->ldb, msg,
 432                            ac->tree, ac->base, ac->scope)) {
 433                 talloc_free(msg);
 434                 return 0;
 435         }
 436
 437         /* filter the attributes that the user wants */
 438         ret = ltdb_filter_attrs(msg, ac->attrs);
 439
 440         if (ret == -1) {
 441                 talloc_free(msg);
 442                 return -1;
 443         }
 444
 445         ret = ldb_module_send_entry(ac->req, msg);
 446         if (ret != LDB_SUCCESS) {
 447                 ac->callback_failed = true;
 448                 /* the callback failed, abort the operation */
 449                 return -1;
 450         }
 451
 452         return 0;
 453 }
 454
 455
 456 /*
 457   search the database with a LDAP-like expression.
 458   this is the "full search" non-indexed variant
 459 */
 460 static int ltdb_search_full(struct ltdb_context *ctx)
 461 {
 462         struct ltdb_private *ltdb = talloc_get_type(ctx->module->private_data, struct ltdb_private);
 463         int ret;
 464
 465         if (ltdb->in_transaction != 0) {
 466                 ret = tdb_traverse(ltdb->tdb, search_func, ctx);
 467         } else {
 468                 ret = tdb_traverse_read(ltdb->tdb, search_func, ctx);
 469         }
 470
 471         if (ret == -1) {
 472                 return LDB_ERR_OPERATIONS_ERROR;
 473         }
 474
 475         return LDB_SUCCESS;
 476 }
 477
 478 /*
 479   search the database with a LDAP-like expression.
 480   choses a search method
 481 */
 482 int ltdb_search(struct ltdb_context *ctx)
 483 {
 484         struct ldb_module *module = ctx->module;
 485         struct ldb_request *req = ctx->req;
 486         struct ltdb_private *ltdb = talloc_get_type(module->private_data, struct ltdb_private);
 487         int ret;
 488
 489         req->handle->state = LDB_ASYNC_PENDING;
 490
 491         if (ltdb_lock_read(module) != 0) {
 492                 return LDB_ERR_OPERATIONS_ERROR;
 493         }
 494
 495         if (ltdb_cache_load(module) != 0) {
 496                 ltdb_unlock_read(module);
 497                 return LDB_ERR_OPERATIONS_ERROR;
 498         }
 499
 500         if (req->op.search.tree == NULL) {
 501                 ltdb_unlock_read(module);
 502                 return LDB_ERR_OPERATIONS_ERROR;
 503         }
 504
 505         if ((req->op.search.base == NULL) || (ldb_dn_is_null(req->op.search.base) == true)) {
 506
 507                 /* Check what we should do with a NULL dn */
 508                 switch (req->op.search.scope) {
 509                 case LDB_SCOPE_BASE:
 510                         ldb_asprintf_errstring(module->ldb,
 511                                                "NULL Base DN invalid for a base search");
 512                         ret = LDB_ERR_INVALID_DN_SYNTAX;
 513                         break;
 514                 case LDB_SCOPE_ONELEVEL:
 515                         ldb_asprintf_errstring(module->ldb,
 516                                                "NULL Base DN invalid for a one-level search");
 517                         ret = LDB_ERR_INVALID_DN_SYNTAX;
 518                         break;
 519                 case LDB_SCOPE_SUBTREE:
 520                 default:
 521                         /* We accept subtree searches from a NULL base DN, ie over the whole DB */
 522                         ret = LDB_SUCCESS;
 523                 }
 524         } else if (ldb_dn_is_valid(req->op.search.base) == false) {
 525
 526                 /* We don't want invalid base DNs here */
 527                 ldb_asprintf_errstring(module->ldb,
 528                                        "Invalid Base DN: %s",
 529                                        ldb_dn_get_linearized(req->op.search.base));
 530                 ret = LDB_ERR_INVALID_DN_SYNTAX;
 531
 532         } else if (ltdb->check_base) {
 533                 /* This database has been marked as 'checkBaseOnSearch', so do a spot check of the base dn */
 534                 ret = ltdb_search_base(module, req->op.search.base);
 535
 536                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 537                         ldb_asprintf_errstring(module->ldb,
 538                                                "No such Base DN: %s",
 539                                                ldb_dn_get_linearized(req->op.search.base));
 540                 }
 541
 542         } else {
 543                 /* If we are not checking the base DN life is easy */
 544                 ret = LDB_SUCCESS;
 545         }
 546
 547         ctx->tree = req->op.search.tree;
 548         ctx->scope = req->op.search.scope;
 549         ctx->base = req->op.search.base;
 550         ctx->attrs = req->op.search.attrs;
 551
 552         if (ret == LDB_SUCCESS) {
 553                 ret = ltdb_search_indexed(ctx);
 554                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 555                         /* Not in the index, therefore OK! */
 556                         ret = LDB_SUCCESS;
 557
 558                 }
 559                 /* Check if we got just a normal error.
 560                  * In that case proceed to a full search unless we got a
 561                  * callback error */
 562                 if ( ! ctx->callback_failed && ret != LDB_SUCCESS) {
 563                         /* Not indexed, so we need to do a full scan */
 564                         ret = ltdb_search_full(ctx);
 565                         if (ret != LDB_SUCCESS) {
 566                                 ldb_set_errstring(module->ldb, "Indexed and full searches both failed!\n");
 567                         }
 568                 }
 569         }
 570
 571         ltdb_unlock_read(module);
 572
 573         return ret;
 574 }
 575