source4/lib/registry/ldb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Registry interface
   4    Copyright (C) 2004-2007, Jelmer Vernooij, jelmer@samba.org
   5    Copyright (C) 2008-2010, Matthias Dieter Wallnöfer, mdw@samba.org
   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 #include "includes.h"
  22 #include "registry.h"
  23 #include "lib/ldb/include/ldb.h"
  24 #include "lib/ldb/include/ldb_errors.h"
  25 #include "ldb_wrap.h"
  26 #include "librpc/gen_ndr/winreg.h"
  27 #include "param/param.h"
  28
  29 static struct hive_operations reg_backend_ldb;
  30
  31 struct ldb_key_data
  32 {
  33         struct hive_key key;
  34         struct ldb_context *ldb;
  35         struct ldb_dn *dn;
  36         struct ldb_message **subkeys, **values;
  37         unsigned int subkey_count, value_count;
  38 };
  39
  40 static void reg_ldb_unpack_value(TALLOC_CTX *mem_ctx,
  41                                  struct ldb_message *msg,
  42                                  const char **name, uint32_t *type,
  43                                  DATA_BLOB *data)
  44 {
  45         const struct ldb_val *val;
  46         uint32_t value_type;
  47
  48         if (name != NULL) {
  49                 *name = talloc_strdup(mem_ctx,
  50                                       ldb_msg_find_attr_as_string(msg, "value",
  51                                       NULL));
  52         }
  53
  54         value_type = ldb_msg_find_attr_as_uint(msg, "type", 0);
  55         *type = value_type;
  56
  57         val = ldb_msg_find_ldb_val(msg, "data");
  58
  59         switch (value_type)
  60         {
  61         case REG_SZ:
  62         case REG_EXPAND_SZ:
  63                 if (val != NULL) {
  64                         convert_string_talloc(mem_ctx, CH_UTF8, CH_UTF16,
  65                                                      val->data, val->length,
  66                                                      (void **)&data->data, &data->length, false);
  67                 } else {
  68                         data->data = NULL;
  69                         data->length = 0;
  70                 }
  71                 break;
  72
  73         case REG_DWORD:
  74                 if (val != NULL) {
  75                         uint32_t tmp = strtoul((char *)val->data, NULL, 0);
  76                         *data = data_blob_talloc(mem_ctx, NULL, 4);
  77                         SIVAL(data->data, 0, tmp);
  78                 } else {
  79                         data->data = NULL;
  80                         data->length = 0;
  81                 }
  82                 break;
  83
  84         case REG_BINARY:
  85         default:
  86                 if (val != NULL) {
  87                         *data = data_blob_talloc(mem_ctx, val->data, val->length);
  88                 } else {
  89                         data->data = NULL;
  90                         data->length = 0;
  91                 }
  92                 break;
  93         }
  94 }
  95
  96 static struct ldb_message *reg_ldb_pack_value(struct ldb_context *ctx,
  97                                               TALLOC_CTX *mem_ctx,
  98                                               const char *name,
  99                                               uint32_t type, DATA_BLOB data)
 100 {
 101         struct ldb_message *msg;
 102         char *name_dup, *type_str;
 103         int ret;
 104
 105         msg = talloc_zero(mem_ctx, struct ldb_message);
 106         if (msg == NULL) {
 107                 return NULL;
 108         }
 109
 110         name_dup = talloc_strdup(msg, name);
 111         if (name_dup == NULL) {
 112                 talloc_free(msg);
 113                 return NULL;
 114         }
 115
 116         ret = ldb_msg_add_string(msg, "value", name_dup);
 117         if (ret != LDB_SUCCESS) {
 118                 talloc_free(msg);
 119                 return NULL;
 120         }
 121
 122         switch (type) {
 123         case REG_SZ:
 124         case REG_EXPAND_SZ:
 125                 if ((data.length > 0) && (data.data != NULL)
 126                     && (data.data[0] != '\0')) {
 127                         struct ldb_val *val;
 128                         bool ret2;
 129
 130                         val = talloc_zero(msg, struct ldb_val);
 131                         if (val == NULL) {
 132                                 talloc_free(msg);
 133                                 return NULL;
 134                         }
 135
 136                         ret2 = convert_string_talloc(mem_ctx, CH_UTF16, CH_UTF8,
 137                                                      (void *)data.data, data.length,
 138                                                      (void **)&val->data, &val->length,
 139                                                      false);
 140                         ret = ldb_msg_add_value(msg, "data", val, NULL);
 141                 } else {
 142                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 143                 }
 144                 break;
 145
 146         case REG_DWORD:
 147                 if ((data.length > 0) && (data.data != NULL)) {
 148                         char *conv_str;
 149
 150                         conv_str = talloc_asprintf(msg, "0x%x", IVAL(data.data, 0));
 151                         if (conv_str == NULL) {
 152                                 talloc_free(msg);
 153                                 return NULL;
 154                         }
 155
 156                         ret = ldb_msg_add_string(msg, "data", conv_str);
 157                 } else {
 158                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 159                 }
 160                 break;
 161
 162         case REG_BINARY:
 163         default:
 164                 if ((data.length > 0) && (data.data != NULL)
 165                     && (data.data[0] != '\0')) {
 166                         ret = ldb_msg_add_value(msg, "data", &data, NULL);
 167                 } else {
 168                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 169                 }
 170                 break;
 171         }
 172
 173         if (ret != LDB_SUCCESS) {
 174                 talloc_free(msg);
 175                 return NULL;
 176         }
 177
 178         type_str = talloc_asprintf(mem_ctx, "%u", type);
 179         if (type_str == NULL) {
 180                 talloc_free(msg);
 181                 return NULL;
 182         }
 183
 184         ret = ldb_msg_add_string(msg, "type", type_str);
 185         if (ret != LDB_SUCCESS) {
 186                 talloc_free(msg);
 187                 return NULL;
 188         }
 189
 190         return msg;
 191 }
 192
 193 static char *reg_ldb_escape(TALLOC_CTX *mem_ctx, const char *value)
 194 {
 195         struct ldb_val val;
 196
 197         val.data = discard_const_p(uint8_t, value);
 198         val.length = strlen(value);
 199
 200         return ldb_dn_escape_value(mem_ctx, val);
 201 }
 202
 203 static int reg_close_ldb_key(struct ldb_key_data *key)
 204 {
 205         if (key->subkeys != NULL) {
 206                 talloc_free(key->subkeys);
 207                 key->subkeys = NULL;
 208         }
 209
 210         if (key->values != NULL) {
 211                 talloc_free(key->values);
 212                 key->values = NULL;
 213         }
 214         return 0;
 215 }
 216
 217 static struct ldb_dn *reg_path_to_ldb(TALLOC_CTX *mem_ctx,
 218                                       const struct hive_key *from,
 219                                       const char *path, const char *add)
 220 {
 221         TALLOC_CTX *local_ctx;
 222         struct ldb_dn *ret;
 223         char *mypath = talloc_strdup(mem_ctx, path);
 224         char *begin;
 225         struct ldb_key_data *kd = talloc_get_type(from, struct ldb_key_data);
 226         struct ldb_context *ldb = kd->ldb;
 227
 228         local_ctx = talloc_new(mem_ctx);
 229
 230         ret = ldb_dn_new(mem_ctx, ldb, add);
 231         if (!ldb_dn_validate(ret)) {
 232                 talloc_free(ret);
 233                 talloc_free(local_ctx);
 234                 return NULL;
 235         }
 236
 237         while (mypath) {
 238                 char *keyname;
 239
 240                 begin = strrchr(mypath, '\\');
 241
 242                 if (begin) keyname = begin + 1;
 243                 else keyname = mypath;
 244
 245                 if (keyname[0] != '\0') {
 246                         if (!ldb_dn_add_base_fmt(ret, "key=%s",
 247                                                  reg_ldb_escape(local_ctx,
 248                                                                 keyname)))
 249                         {
 250                                 talloc_free(local_ctx);
 251                                 return NULL;
 252                         }
 253                 }
 254
 255                 if(begin) {
 256                         *begin = '\0';
 257                 } else {
 258                         break;
 259                 }
 260         }
 261
 262         ldb_dn_add_base(ret, kd->dn);
 263
 264         talloc_free(local_ctx);
 265
 266         return ret;
 267 }
 268
 269 static WERROR cache_subkeys(struct ldb_key_data *kd)
 270 {
 271         struct ldb_context *c = kd->ldb;
 272         struct ldb_result *res;
 273         int ret;
 274
 275         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL, NULL, "(key=*)");
 276
 277         if (ret != LDB_SUCCESS) {
 278                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 279                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 280                 return WERR_FOOBAR;
 281         }
 282
 283         kd->subkey_count = res->count;
 284         kd->subkeys = talloc_steal(kd, res->msgs);
 285         talloc_free(res);
 286
 287         return WERR_OK;
 288 }
 289
 290 static WERROR cache_values(struct ldb_key_data *kd)
 291 {
 292         struct ldb_context *c = kd->ldb;
 293         struct ldb_result *res;
 294         int ret;
 295
 296         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 297                          NULL, "(value=*)");
 298
 299         if (ret != LDB_SUCCESS) {
 300                 DEBUG(0, ("Error getting values for '%s': %s\n",
 301                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 302                 return WERR_FOOBAR;
 303         }
 304
 305         kd->value_count = res->count;
 306         kd->values = talloc_steal(kd, res->msgs);
 307         talloc_free(res);
 308
 309         return WERR_OK;
 310 }
 311
 312
 313 static WERROR ldb_get_subkey_by_id(TALLOC_CTX *mem_ctx,
 314                                    const struct hive_key *k, uint32_t idx,
 315                                    const char **name,
 316                                    const char **classname,
 317                                    NTTIME *last_mod_time)
 318 {
 319         struct ldb_message_element *el;
 320         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 321
 322         /* Initialization */
 323         if (name != NULL)
 324                 *name = NULL;
 325         if (classname != NULL)
 326                 *classname = NULL; /* TODO: Store properly */
 327         if (last_mod_time != NULL)
 328                 *last_mod_time = 0; /* TODO: we need to add this to the
 329                                                 ldb backend properly */
 330
 331         /* Do a search if necessary */
 332         if (kd->subkeys == NULL) {
 333                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 334         }
 335
 336         if (idx >= kd->subkey_count)
 337                 return WERR_NO_MORE_ITEMS;
 338
 339         el = ldb_msg_find_element(kd->subkeys[idx], "key");
 340         SMB_ASSERT(el != NULL);
 341         SMB_ASSERT(el->num_values != 0);
 342
 343         if (name != NULL)
 344                 *name = talloc_strdup(mem_ctx, (char *)el->values[0].data);
 345
 346         return WERR_OK;
 347 }
 348
 349 static WERROR ldb_get_default_value(TALLOC_CTX *mem_ctx, struct hive_key *k,
 350                                   const char **name, uint32_t *data_type,
 351                                    DATA_BLOB *data)
 352 {
 353         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 354         struct ldb_context *c = kd->ldb;
 355         const char* attrs[] = { "data", "type", NULL };
 356         struct ldb_result *res;
 357         int ret;
 358
 359         ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_BASE, attrs, "%s", "");
 360
 361         if (ret != LDB_SUCCESS) {
 362                 DEBUG(0, ("Error getting default value for '%s': %s\n",
 363                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 364                 return WERR_FOOBAR;
 365         }
 366
 367         if (res->count == 0 || res->msgs[0]->num_elements == 0)
 368                 return WERR_BADFILE;
 369
 370         reg_ldb_unpack_value(mem_ctx,
 371                  res->msgs[0], name, data_type, data);
 372
 373         talloc_free(res);
 374
 375         return WERR_OK;
 376 }
 377
 378 static WERROR ldb_get_value_by_id(TALLOC_CTX *mem_ctx, struct hive_key *k,
 379                                   uint32_t idx, const char **name,
 380                                   uint32_t *data_type, DATA_BLOB *data)
 381 {
 382         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 383
 384         /* if default value exists, give it back */
 385         if (W_ERROR_IS_OK(ldb_get_default_value(mem_ctx, k, name, data_type,
 386                 data))) {
 387                 if (idx == 0)
 388                         return WERR_OK;
 389                 else
 390                         --idx;
 391         }
 392
 393         /* Do the search if necessary */
 394         if (kd->values == NULL) {
 395                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 396         }
 397
 398         if (idx >= kd->value_count)
 399                 return WERR_NO_MORE_ITEMS;
 400
 401         reg_ldb_unpack_value(mem_ctx, kd->values[idx], name, data_type, data);
 402
 403         return WERR_OK;
 404 }
 405
 406 static WERROR ldb_get_value(TALLOC_CTX *mem_ctx, struct hive_key *k,
 407                             const char *name, uint32_t *data_type,
 408                             DATA_BLOB *data)
 409 {
 410         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 411         struct ldb_context *c = kd->ldb;
 412         struct ldb_result *res;
 413         int ret;
 414         char *query;
 415
 416         if (name == NULL) {
 417                 return WERR_INVALID_PARAM;
 418         }
 419
 420         if (name[0] == '\0') {
 421                 /* default value */
 422                 return ldb_get_default_value(mem_ctx, k, NULL, data_type, data);
 423         } else {
 424                 /* normal value */
 425                 query = talloc_asprintf(mem_ctx, "(value=%s)", name);
 426                 ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_ONELEVEL, NULL, "%s", query);
 427                 talloc_free(query);
 428
 429                 if (ret != LDB_SUCCESS) {
 430                         DEBUG(0, ("Error getting values for '%s': %s\n",
 431                                 ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 432                         return WERR_FOOBAR;
 433                 }
 434
 435                 if (res->count == 0)
 436                         return WERR_BADFILE;
 437
 438                 reg_ldb_unpack_value(mem_ctx, res->msgs[0], NULL, data_type, data);
 439
 440                 talloc_free(res);
 441         }
 442
 443         return WERR_OK;
 444 }
 445
 446 static WERROR ldb_open_key(TALLOC_CTX *mem_ctx, const struct hive_key *h,
 447                            const char *name, struct hive_key **key)
 448 {
 449         struct ldb_result *res;
 450         struct ldb_dn *ldap_path;
 451         int ret;
 452         struct ldb_key_data *newkd;
 453         struct ldb_key_data *kd = talloc_get_type(h, struct ldb_key_data);
 454         struct ldb_context *c = kd->ldb;
 455
 456         ldap_path = reg_path_to_ldb(mem_ctx, h, name, NULL);
 457
 458         ret = ldb_search(c, mem_ctx, &res, ldap_path, LDB_SCOPE_BASE, NULL, "(key=*)");
 459
 460         if (ret != LDB_SUCCESS) {
 461                 DEBUG(3, ("Error opening key '%s': %s\n",
 462                         ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 463                 return WERR_FOOBAR;
 464         } else if (res->count == 0) {
 465                 DEBUG(3, ("Key '%s' not found\n",
 466                         ldb_dn_get_linearized(ldap_path)));
 467                 talloc_free(res);
 468                 return WERR_BADFILE;
 469         }
 470
 471         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 472         newkd->key.ops = &reg_backend_ldb;
 473         newkd->ldb = talloc_reference(newkd, kd->ldb);
 474         newkd->dn = ldb_dn_copy(mem_ctx, res->msgs[0]->dn);
 475
 476         *key = (struct hive_key *)newkd;
 477
 478         return WERR_OK;
 479 }
 480
 481 WERROR reg_open_ldb_file(TALLOC_CTX *parent_ctx, const char *location,
 482                          struct auth_session_info *session_info,
 483                          struct cli_credentials *credentials,
 484                          struct tevent_context *ev_ctx,
 485                          struct loadparm_context *lp_ctx,
 486                          struct hive_key **k)
 487 {
 488         struct ldb_key_data *kd;
 489         struct ldb_context *wrap;
 490         struct ldb_message *attrs_msg;
 491
 492         if (location == NULL)
 493                 return WERR_INVALID_PARAM;
 494
 495         wrap = ldb_wrap_connect(parent_ctx, ev_ctx, lp_ctx,
 496                                 location, session_info, credentials, 0);
 497
 498         if (wrap == NULL) {
 499                 DEBUG(1, (__FILE__": unable to connect\n"));
 500                 return WERR_FOOBAR;
 501         }
 502
 503         attrs_msg = ldb_msg_new(wrap);
 504         W_ERROR_HAVE_NO_MEMORY(attrs_msg);
 505         attrs_msg->dn = ldb_dn_new(attrs_msg, wrap, "@ATTRIBUTES");
 506         W_ERROR_HAVE_NO_MEMORY(attrs_msg->dn);
 507         ldb_msg_add_string(attrs_msg, "key", "CASE_INSENSITIVE");
 508         ldb_msg_add_string(attrs_msg, "value", "CASE_INSENSITIVE");
 509
 510         ldb_add(wrap, attrs_msg);
 511
 512         ldb_set_debug_stderr(wrap);
 513
 514         kd = talloc_zero(parent_ctx, struct ldb_key_data);
 515         kd->key.ops = &reg_backend_ldb;
 516         kd->ldb = talloc_reference(kd, wrap);
 517         talloc_set_destructor (kd, reg_close_ldb_key);
 518         kd->dn = ldb_dn_new(kd, wrap, "hive=NONE");
 519
 520         *k = (struct hive_key *)kd;
 521
 522         return WERR_OK;
 523 }
 524
 525 static WERROR ldb_add_key(TALLOC_CTX *mem_ctx, const struct hive_key *parent,
 526                           const char *name, const char *classname,
 527                           struct security_descriptor *sd,
 528                           struct hive_key **newkey)
 529 {
 530         struct ldb_key_data *parentkd = discard_const_p(struct ldb_key_data, parent);
 531         struct ldb_message *msg;
 532         struct ldb_key_data *newkd;
 533         int ret;
 534
 535         msg = ldb_msg_new(mem_ctx);
 536
 537         msg->dn = reg_path_to_ldb(msg, parent, name, NULL);
 538
 539         ldb_msg_add_string(msg, "key", talloc_strdup(mem_ctx, name));
 540         if (classname != NULL)
 541                 ldb_msg_add_string(msg, "classname",
 542                                    talloc_strdup(mem_ctx, classname));
 543
 544         ret = ldb_add(parentkd->ldb, msg);
 545         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 546                 return WERR_ALREADY_EXISTS;
 547         }
 548
 549         if (ret != LDB_SUCCESS) {
 550                 DEBUG(1, ("ldb_add: %s\n", ldb_errstring(parentkd->ldb)));
 551                 return WERR_FOOBAR;
 552         }
 553
 554         DEBUG(2, ("key added: %s\n", ldb_dn_get_linearized(msg->dn)));
 555
 556         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 557         newkd->ldb = talloc_reference(newkd, parentkd->ldb);
 558         newkd->key.ops = &reg_backend_ldb;
 559         newkd->dn = talloc_steal(newkd, msg->dn);
 560
 561         *newkey = (struct hive_key *)newkd;
 562
 563         /* reset cache */
 564         talloc_free(parentkd->subkeys);
 565         parentkd->subkeys = NULL;
 566
 567         return WERR_OK;
 568 }
 569
 570 static WERROR ldb_del_value (struct hive_key *key, const char *child)
 571 {
 572         int ret;
 573         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 574         TALLOC_CTX *mem_ctx;
 575         struct ldb_message *msg;
 576         struct ldb_dn *childdn;
 577
 578         if ((child == NULL) || (child[0] == '\0')) {
 579                 /* default value */
 580                 mem_ctx = talloc_init("ldb_del_value");
 581
 582                 msg = talloc_zero(mem_ctx, struct ldb_message);
 583                 msg->dn = ldb_dn_copy(msg, kd->dn);
 584                 ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 585                 ldb_msg_add_empty(msg, "type", LDB_FLAG_MOD_DELETE, NULL);
 586
 587                 ret = ldb_modify(kd->ldb, msg);
 588                 if (ret != LDB_SUCCESS) {
 589                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 590                         talloc_free(mem_ctx);
 591                         return WERR_FOOBAR;
 592                 }
 593
 594                 talloc_free(mem_ctx);
 595         } else {
 596                 /* normal value */
 597                 childdn = ldb_dn_copy(kd->ldb, kd->dn);
 598                 if (!ldb_dn_add_child_fmt(childdn, "value=%s",
 599                                   reg_ldb_escape(childdn, child)))
 600                 {
 601                         talloc_free(childdn);
 602                         return WERR_FOOBAR;
 603                 }
 604
 605                 ret = ldb_delete(kd->ldb, childdn);
 606
 607                 talloc_free(childdn);
 608
 609                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 610                         return WERR_BADFILE;
 611                 } else if (ret != LDB_SUCCESS) {
 612                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 613                         return WERR_FOOBAR;
 614                 }
 615         }
 616
 617         /* reset cache */
 618         talloc_free(kd->values);
 619         kd->values = NULL;
 620
 621         return WERR_OK;
 622 }
 623
 624 static WERROR ldb_del_key(const struct hive_key *key, const char *name)
 625 {
 626         unsigned int i;
 627         int ret;
 628         struct ldb_key_data *parentkd = talloc_get_type(key, struct ldb_key_data);
 629         struct ldb_dn *ldap_path;
 630         TALLOC_CTX *mem_ctx = talloc_init("ldb_del_key");
 631         struct ldb_context *c = parentkd->ldb;
 632         struct ldb_result *res_keys;
 633         struct ldb_result *res_vals;
 634         WERROR werr;
 635         struct hive_key *hk;
 636
 637         /* Verify key exists by opening it */
 638         werr = ldb_open_key(mem_ctx, key, name, &hk);
 639         if (!W_ERROR_IS_OK(werr)) {
 640                 talloc_free(mem_ctx);
 641                 return werr;
 642         }
 643
 644         ldap_path = reg_path_to_ldb(mem_ctx, key, name, NULL);
 645         if (!ldap_path) {
 646                 talloc_free(mem_ctx);
 647                 return WERR_FOOBAR;
 648         }
 649
 650         /* Search for subkeys */
 651         ret = ldb_search(c, mem_ctx, &res_keys, ldap_path, LDB_SCOPE_ONELEVEL,
 652                          NULL, "(key=*)");
 653
 654         if (ret != LDB_SUCCESS) {
 655                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 656                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 657                 talloc_free(mem_ctx);
 658                 return WERR_FOOBAR;
 659         }
 660
 661         /* Search for values */
 662         ret = ldb_search(c, mem_ctx, &res_vals, ldap_path, LDB_SCOPE_ONELEVEL,
 663                          NULL, "(value=*)");
 664
 665         if (ret != LDB_SUCCESS) {
 666                 DEBUG(0, ("Error getting values for '%s': %s\n",
 667                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 668                 talloc_free(mem_ctx);
 669                 return WERR_FOOBAR;
 670         }
 671
 672         /* Start an explicit transaction */
 673         ret = ldb_transaction_start(c);
 674
 675         if (ret != LDB_SUCCESS) {
 676                 DEBUG(0, ("ldb_transaction_start: %s\n", ldb_errstring(c)));
 677                 talloc_free(mem_ctx);
 678                 return WERR_FOOBAR;
 679         }
 680
 681         if (res_keys->count || res_vals->count)
 682         {
 683                 /* Delete any subkeys */
 684                 for (i = 0; i < res_keys->count; i++)
 685                 {
 686                         werr = ldb_del_key(hk, ldb_msg_find_attr_as_string(
 687                                                         res_keys->msgs[i],
 688                                                         "key", NULL));
 689                         if (!W_ERROR_IS_OK(werr)) {
 690                                 ret = ldb_transaction_cancel(c);
 691                                 talloc_free(mem_ctx);
 692                                 return werr;
 693                         }
 694                 }
 695
 696                 /* Delete any values */
 697                 for (i = 0; i < res_vals->count; i++)
 698                 {
 699                         werr = ldb_del_value(hk, ldb_msg_find_attr_as_string(
 700                                                         res_vals->msgs[i],
 701                                                         "value", NULL));
 702                         if (!W_ERROR_IS_OK(werr)) {
 703                                 ret = ldb_transaction_cancel(c);
 704                                 talloc_free(mem_ctx);
 705                                 return werr;
 706                         }
 707                 }
 708         }
 709
 710         /* Delete the key itself */
 711         ret = ldb_delete(c, ldap_path);
 712
 713         if (ret != LDB_SUCCESS)
 714         {
 715                 DEBUG(1, ("ldb_del_key: %s\n", ldb_errstring(c)));
 716                 ret = ldb_transaction_cancel(c);
 717                 talloc_free(mem_ctx);
 718                 return WERR_FOOBAR;
 719         }
 720
 721         /* Commit the transaction */
 722         ret = ldb_transaction_commit(c);
 723
 724         if (ret != LDB_SUCCESS)
 725         {
 726                 DEBUG(0, ("ldb_transaction_commit: %s\n", ldb_errstring(c)));
 727                 ret = ldb_transaction_cancel(c);
 728                 talloc_free(mem_ctx);
 729                 return WERR_FOOBAR;
 730         }
 731
 732         talloc_free(mem_ctx);
 733
 734         /* reset cache */
 735         talloc_free(parentkd->subkeys);
 736         parentkd->subkeys = NULL;
 737
 738         return WERR_OK;
 739 }
 740
 741 static WERROR ldb_set_value(struct hive_key *parent,
 742                             const char *name, uint32_t type,
 743                             const DATA_BLOB data)
 744 {
 745         struct ldb_message *msg;
 746         struct ldb_key_data *kd = talloc_get_type(parent, struct ldb_key_data);
 747         unsigned int i;
 748         int ret;
 749         TALLOC_CTX *mem_ctx = talloc_init("ldb_set_value");
 750
 751         msg = reg_ldb_pack_value(kd->ldb, mem_ctx, name, type, data);
 752         msg->dn = ldb_dn_copy(msg, kd->dn);
 753
 754         if ((name != NULL) && (name[0] != '\0')) {
 755                 /* For a default value, we add/overwrite the attributes to/of the hive.
 756                    For a normal value, we create a new child. */
 757                 if (!ldb_dn_add_child_fmt(msg->dn, "value=%s",
 758                                   reg_ldb_escape(mem_ctx, name)))
 759                 {
 760                         talloc_free(mem_ctx);
 761                         return WERR_FOOBAR;
 762                 }
 763         }
 764
 765         /* Try first a "modify" and if this doesn't work do try an "add" */
 766         for (i = 0; i < msg->num_elements; i++) {
 767                 if (msg->elements[i].flags != LDB_FLAG_MOD_DELETE) {
 768                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 769                 }
 770         }
 771         ret = ldb_modify(kd->ldb, msg);
 772         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 773                 i = 0;
 774                 while (i < msg->num_elements) {
 775                         if (msg->elements[i].flags == LDB_FLAG_MOD_DELETE) {
 776                                 ldb_msg_remove_element(msg, &msg->elements[i]);
 777                         } else {
 778                                 ++i;
 779                         }
 780                 }
 781                 ret = ldb_add(kd->ldb, msg);
 782         }
 783         if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
 784                 /* ignore this -> the value didn't exist and also now doesn't */
 785                 ret = LDB_SUCCESS;
 786         }
 787
 788         if (ret != LDB_SUCCESS) {
 789                 DEBUG(1, ("ldb_set_value: %s\n", ldb_errstring(kd->ldb)));
 790                 talloc_free(mem_ctx);
 791                 return WERR_FOOBAR;
 792         }
 793
 794         /* reset cache */
 795         talloc_free(kd->values);
 796         kd->values = NULL;
 797
 798         talloc_free(mem_ctx);
 799         return WERR_OK;
 800 }
 801
 802 static WERROR ldb_get_key_info(TALLOC_CTX *mem_ctx,
 803                                const struct hive_key *key,
 804                                const char **classname,
 805                                uint32_t *num_subkeys,
 806                                uint32_t *num_values,
 807                                NTTIME *last_change_time,
 808                                uint32_t *max_subkeynamelen,
 809                                uint32_t *max_valnamelen,
 810                                uint32_t *max_valbufsize)
 811 {
 812         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 813
 814         /* Initialization */
 815         if (classname != NULL)
 816                 *classname = NULL;
 817         if (num_subkeys != NULL)
 818                 *num_subkeys = 0;
 819         if (num_values != NULL)
 820                 *num_values = 0;
 821         if (last_change_time != NULL)
 822                 *last_change_time = 0;
 823         if (max_subkeynamelen != NULL)
 824                 *max_subkeynamelen = 0;
 825         if (max_valnamelen != NULL)
 826                 *max_valnamelen = 0;
 827         if (max_valbufsize != NULL)
 828                 *max_valbufsize = 0;
 829
 830         if (kd->subkeys == NULL) {
 831                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 832         }
 833
 834         if (kd->values == NULL) {
 835                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 836         }
 837
 838         if (num_subkeys != NULL) {
 839                 *num_subkeys = kd->subkey_count;
 840         }
 841         if (num_values != NULL) {
 842                 *num_values = kd->value_count;
 843         }
 844
 845
 846         if (max_subkeynamelen != NULL) {
 847                 unsigned int i;
 848                 struct ldb_message_element *el;
 849
 850                 *max_subkeynamelen = 0;
 851
 852                 for (i = 0; i < kd->subkey_count; i++) {
 853                         el = ldb_msg_find_element(kd->subkeys[i], "key");
 854                         *max_subkeynamelen = MAX(*max_subkeynamelen, el->values[0].length);
 855                 }
 856         }
 857
 858         if (max_valnamelen != NULL || max_valbufsize != NULL) {
 859                 unsigned int i;
 860                 struct ldb_message_element *el;
 861                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 862
 863                 if (max_valbufsize != NULL)
 864                         *max_valbufsize = 0;
 865
 866                 if (max_valnamelen != NULL)
 867                         *max_valnamelen = 0;
 868
 869                 for (i = 0; i < kd->value_count; i++) {
 870                         if (max_valnamelen != NULL) {
 871                                 el = ldb_msg_find_element(kd->values[i], "value");
 872                                 *max_valnamelen = MAX(*max_valnamelen, el->values[0].length);
 873                         }
 874
 875                         if (max_valbufsize != NULL) {
 876                                 uint32_t data_type;
 877                                 DATA_BLOB data;
 878                                 reg_ldb_unpack_value(mem_ctx,
 879                                                      kd->values[i], NULL,
 880                                                      &data_type, &data);
 881                                 *max_valbufsize = MAX(*max_valbufsize, data.length);
 882                                 talloc_free(data.data);
 883                         }
 884                 }
 885         }
 886
 887         return WERR_OK;
 888 }
 889
 890 static struct hive_operations reg_backend_ldb = {
 891         .name = "ldb",
 892         .add_key = ldb_add_key,
 893         .del_key = ldb_del_key,
 894         .get_key_by_name = ldb_open_key,
 895         .enum_value = ldb_get_value_by_id,
 896         .enum_key = ldb_get_subkey_by_id,
 897         .set_value = ldb_set_value,
 898         .get_value_by_name = ldb_get_value,
 899         .delete_value = ldb_del_value,
 900         .get_key_info = ldb_get_key_info,
 901 };