source4/lib/registry/ldb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Registry interface
   4    Copyright (C) Jelmer Vernooij  2004-2007.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "registry.h"
  22 #include "lib/ldb/include/ldb.h"
  23 #include "lib/ldb/include/ldb_errors.h"
  24 #include "ldb_wrap.h"
  25 #include "librpc/gen_ndr/winreg.h"
  26 #include "param/param.h"
  27
  28 static struct hive_operations reg_backend_ldb;
  29
  30 struct ldb_key_data
  31 {
  32         struct hive_key key;
  33         struct ldb_context *ldb;
  34         struct ldb_dn *dn;
  35         struct ldb_message **subkeys, **values;
  36         int subkey_count, value_count;
  37 };
  38
  39 static void reg_ldb_unpack_value(TALLOC_CTX *mem_ctx, struct ldb_message *msg,
  40                                  const char **name, uint32_t *type,
  41                                  DATA_BLOB *data)
  42 {
  43         const struct ldb_val *val;
  44         uint32_t value_type;
  45
  46         if (name != NULL)
  47                 *name = talloc_strdup(mem_ctx,
  48                                       ldb_msg_find_attr_as_string(msg, "value",
  49                                       NULL));
  50
  51         value_type = ldb_msg_find_attr_as_uint(msg, "type", 0);
  52         if (type != NULL)
  53                 *type = value_type;
  54         val = ldb_msg_find_ldb_val(msg, "data");
  55
  56         switch (value_type)
  57         {
  58         case REG_SZ:
  59         case REG_EXPAND_SZ:
  60                 data->length = convert_string_talloc(mem_ctx, lp_iconv_convenience(global_loadparm), CH_UTF8, CH_UTF16,
  61                                                      val->data, val->length,
  62                                                      (void **)&data->data);
  63                 break;
  64
  65         case REG_DWORD: {
  66                 uint32_t tmp = strtoul((char *)val->data, NULL, 0);
  67                 *data = data_blob_talloc(mem_ctx, &tmp, 4);
  68                 }
  69                 break;
  70
  71         default:
  72                 *data = data_blob_talloc(mem_ctx, val->data, val->length);
  73                 break;
  74         }
  75 }
  76
  77 static struct ldb_message *reg_ldb_pack_value(struct ldb_context *ctx,
  78                                               TALLOC_CTX *mem_ctx,
  79                                               const char *name,
  80                                               uint32_t type, DATA_BLOB data)
  81 {
  82         struct ldb_val val;
  83         struct ldb_message *msg = talloc_zero(mem_ctx, struct ldb_message);
  84         char *type_s;
  85
  86         ldb_msg_add_string(msg, "value", talloc_strdup(mem_ctx, name));
  87
  88         switch (type) {
  89         case REG_SZ:
  90         case REG_EXPAND_SZ:
  91                 val.length = convert_string_talloc(mem_ctx, lp_iconv_convenience(global_loadparm), CH_UTF16, CH_UNIX,
  92                                                    (void *)data.data,
  93                                                    data.length,
  94                                                    (void **)&val.data);
  95                 ldb_msg_add_value(msg, "data", &val, NULL);
  96                 break;
  97
  98         case REG_DWORD:
  99                 ldb_msg_add_string(msg, "data",
 100                                    talloc_asprintf(mem_ctx, "0x%x",
 101                                                    IVAL(data.data, 0)));
 102                 break;
 103         default:
 104                 ldb_msg_add_value(msg, "data", &data, NULL);
 105         }
 106
 107
 108         type_s = talloc_asprintf(mem_ctx, "%u", type);
 109         ldb_msg_add_string(msg, "type", type_s);
 110
 111         return msg;
 112 }
 113
 114 static char *reg_ldb_escape(TALLOC_CTX *mem_ctx, const char *value)
 115 {
 116         struct ldb_val val;
 117
 118         val.data = discard_const_p(uint8_t, value);
 119         val.length = strlen(value);
 120
 121         return ldb_dn_escape_value(mem_ctx, val);
 122 }
 123
 124 static int reg_close_ldb_key(struct ldb_key_data *key)
 125 {
 126         if (key->subkeys != NULL) {
 127                 talloc_free(key->subkeys);
 128                 key->subkeys = NULL;
 129         }
 130
 131         if (key->values != NULL) {
 132                 talloc_free(key->values);
 133                 key->values = NULL;
 134         }
 135         return 0;
 136 }
 137
 138 static struct ldb_dn *reg_path_to_ldb(TALLOC_CTX *mem_ctx,
 139                                       const struct hive_key *from,
 140                                       const char *path, const char *add)
 141 {
 142         TALLOC_CTX *local_ctx;
 143         struct ldb_dn *ret;
 144         char *mypath = talloc_strdup(mem_ctx, path);
 145         char *begin;
 146         struct ldb_key_data *kd = talloc_get_type(from, struct ldb_key_data);
 147         struct ldb_context *ldb = kd->ldb;
 148
 149         local_ctx = talloc_new(mem_ctx);
 150
 151         if (add) {
 152                 ret = ldb_dn_new(mem_ctx, ldb, add);
 153         } else {
 154                 ret = ldb_dn_new(mem_ctx, ldb, NULL);
 155         }
 156         if (!ldb_dn_validate(ret)) {
 157                 talloc_free(ret);
 158                 talloc_free(local_ctx);
 159                 return NULL;
 160         }
 161
 162         while (mypath) {
 163                 char *keyname;
 164
 165                 begin = strrchr(mypath, '\\');
 166
 167                 if (begin) keyname = begin + 1;
 168                 else keyname = mypath;
 169
 170                 if(strlen(keyname)) {
 171                         if (!ldb_dn_add_base_fmt(ret, "key=%s",
 172                                                  reg_ldb_escape(local_ctx,
 173                                                                 keyname)))
 174                         {
 175                                 talloc_free(local_ctx);
 176                                 return NULL;
 177                         }
 178                 }
 179
 180                 if(begin) {
 181                         *begin = '\0';
 182                 } else {
 183                         break;
 184                 }
 185         }
 186
 187         ldb_dn_add_base(ret, kd->dn);
 188
 189         talloc_free(local_ctx);
 190
 191         return ret;
 192 }
 193
 194 static WERROR cache_subkeys(struct ldb_key_data *kd)
 195 {
 196         struct ldb_context *c = kd->ldb;
 197         struct ldb_result *res;
 198         int ret;
 199
 200         ret = ldb_search(c, kd->dn, LDB_SCOPE_ONELEVEL, "(key=*)", NULL, &res);
 201
 202         if (ret != LDB_SUCCESS) {
 203                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 204                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 205                 return WERR_FOOBAR;
 206         }
 207
 208         kd->subkey_count = res->count;
 209         kd->subkeys = talloc_steal(kd, res->msgs);
 210         talloc_free(res);
 211
 212         return WERR_OK;
 213 }
 214
 215 static WERROR cache_values(struct ldb_key_data *kd)
 216 {
 217         struct ldb_context *c = kd->ldb;
 218         struct ldb_result *res;
 219         int ret;
 220
 221         ret = ldb_search(c, kd->dn, LDB_SCOPE_ONELEVEL,
 222                          "(value=*)", NULL, &res);
 223
 224         if (ret != LDB_SUCCESS) {
 225                 DEBUG(0, ("Error getting values for '%s': %s\n",
 226                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 227                 return WERR_FOOBAR;
 228         }
 229         kd->value_count = res->count;
 230         kd->values = talloc_steal(kd, res->msgs);
 231         talloc_free(res);
 232         return WERR_OK;
 233 }
 234
 235
 236 static WERROR ldb_get_subkey_by_id(TALLOC_CTX *mem_ctx,
 237                                    const struct hive_key *k, uint32_t idx,
 238                                    const char **name,
 239                                    const char **classname,
 240                                    NTTIME *last_mod_time)
 241 {
 242         struct ldb_message_element *el;
 243         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 244
 245         /* Do a search if necessary */
 246         if (kd->subkeys == NULL) {
 247                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 248         }
 249
 250         if (idx >= kd->subkey_count)
 251                 return WERR_NO_MORE_ITEMS;
 252
 253         el = ldb_msg_find_element(kd->subkeys[idx], "key");
 254         SMB_ASSERT(el != NULL);
 255         SMB_ASSERT(el->num_values != 0);
 256
 257         if (name != NULL)
 258                 *name = talloc_strdup(mem_ctx, (char *)el->values[0].data);
 259
 260         if (classname != NULL)
 261                 *classname = NULL; /* TODO: Store properly */
 262
 263         if (last_mod_time != NULL)
 264                 *last_mod_time = 0; /* TODO: we need to add this to the
 265                                                 ldb backend properly */
 266
 267         return WERR_OK;
 268 }
 269
 270 static WERROR ldb_get_value_by_id(TALLOC_CTX *mem_ctx, struct hive_key *k,
 271                                   int idx, const char **name,
 272                                   uint32_t *data_type, DATA_BLOB *data)
 273 {
 274         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 275
 276         /* Do the search if necessary */
 277         if (kd->values == NULL) {
 278                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 279         }
 280
 281         if (idx >= kd->value_count)
 282                 return WERR_NO_MORE_ITEMS;
 283
 284         reg_ldb_unpack_value(mem_ctx, kd->values[idx],
 285                              name, data_type, data);
 286
 287         return WERR_OK;
 288 }
 289
 290 static WERROR ldb_get_value(TALLOC_CTX *mem_ctx, struct hive_key *k,
 291                             const char *name, uint32_t *data_type,
 292                             DATA_BLOB *data)
 293 {
 294         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 295         struct ldb_context *c = kd->ldb;
 296         struct ldb_result *res;
 297         int ret;
 298         char *query = talloc_asprintf(mem_ctx, "(value=%s)", name);
 299
 300         ret = ldb_search(c, kd->dn, LDB_SCOPE_ONELEVEL, query, NULL, &res);
 301
 302         talloc_free(query);
 303
 304         if (ret != LDB_SUCCESS) {
 305                 DEBUG(0, ("Error getting values for '%s': %s\n",
 306                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 307                 return WERR_FOOBAR;
 308         }
 309
 310         if (res->count == 0)
 311                 return WERR_BADFILE;
 312
 313         reg_ldb_unpack_value(mem_ctx, res->msgs[0], NULL, data_type, data);
 314
 315         return WERR_OK;
 316 }
 317
 318 static WERROR ldb_open_key(TALLOC_CTX *mem_ctx, const struct hive_key *h,
 319                            const char *name, struct hive_key **key)
 320 {
 321         struct ldb_result *res;
 322         struct ldb_dn *ldap_path;
 323         int ret;
 324         struct ldb_key_data *newkd;
 325         struct ldb_key_data *kd = talloc_get_type(h, struct ldb_key_data);
 326         struct ldb_context *c = kd->ldb;
 327
 328         ldap_path = reg_path_to_ldb(mem_ctx, h, name, NULL);
 329
 330         ret = ldb_search(c, ldap_path, LDB_SCOPE_BASE, "(key=*)", NULL, &res);
 331
 332         if (ret != LDB_SUCCESS) {
 333                 DEBUG(3, ("Error opening key '%s': %s\n",
 334                         ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 335                 return WERR_FOOBAR;
 336         } else if (res->count == 0) {
 337                 DEBUG(3, ("Key '%s' not found\n",
 338                         ldb_dn_get_linearized(ldap_path)));
 339                 talloc_free(res);
 340                 return WERR_BADFILE;
 341         }
 342
 343         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 344         newkd->key.ops = &reg_backend_ldb;
 345         newkd->ldb = talloc_reference(newkd, kd->ldb);
 346         newkd->dn = ldb_dn_copy(mem_ctx, res->msgs[0]->dn);
 347
 348         *key = (struct hive_key *)newkd;
 349
 350         talloc_free(res);
 351
 352         return WERR_OK;
 353 }
 354
 355 WERROR reg_open_ldb_file(TALLOC_CTX *parent_ctx, const char *location,
 356                          struct auth_session_info *session_info,
 357                          struct cli_credentials *credentials,
 358                          struct loadparm_context *lp_ctx,
 359                          struct hive_key **k)
 360 {
 361         struct ldb_key_data *kd;
 362         struct ldb_context *wrap;
 363         struct ldb_message *attrs_msg;
 364
 365         if (location == NULL)
 366                 return WERR_INVALID_PARAM;
 367
 368         wrap = ldb_wrap_connect(parent_ctx, lp_ctx,
 369                                 location, session_info, credentials, 0, NULL);
 370
 371         if (wrap == NULL) {
 372                 DEBUG(1, (__FILE__": unable to connect\n"));
 373                 return WERR_FOOBAR;
 374         }
 375
 376         attrs_msg = ldb_msg_new(wrap);
 377         W_ERROR_HAVE_NO_MEMORY(attrs_msg);
 378         attrs_msg->dn = ldb_dn_new(attrs_msg, wrap, "@ATTRIBUTES");
 379         W_ERROR_HAVE_NO_MEMORY(attrs_msg->dn);
 380         ldb_msg_add_string(attrs_msg, "key", "CASE_INSENSITIVE");
 381         ldb_msg_add_string(attrs_msg, "value", "CASE_INSENSITIVE");
 382
 383         ldb_add(wrap, attrs_msg);
 384
 385         ldb_set_debug_stderr(wrap);
 386
 387         kd = talloc_zero(parent_ctx, struct ldb_key_data);
 388         kd->key.ops = &reg_backend_ldb;
 389         kd->ldb = talloc_reference(kd, wrap);
 390         talloc_set_destructor (kd, reg_close_ldb_key);
 391         kd->dn = ldb_dn_new(kd, wrap, "hive=NONE");
 392
 393         *k = (struct hive_key *)kd;
 394
 395         return WERR_OK;
 396 }
 397
 398 static WERROR ldb_add_key(TALLOC_CTX *mem_ctx, const struct hive_key *parent,
 399                           const char *name, const char *classname,
 400                           struct security_descriptor *sd,
 401                           struct hive_key **newkey)
 402 {
 403         struct ldb_key_data *parentkd = discard_const_p(struct ldb_key_data, parent);
 404         struct ldb_message *msg;
 405         struct ldb_key_data *newkd;
 406         int ret;
 407
 408         msg = ldb_msg_new(mem_ctx);
 409
 410         msg->dn = reg_path_to_ldb(msg, parent, name, NULL);
 411
 412         ldb_msg_add_string(msg, "key", talloc_strdup(mem_ctx, name));
 413         if (classname != NULL)
 414                 ldb_msg_add_string(msg, "classname",
 415                                    talloc_strdup(mem_ctx, classname));
 416
 417         ret = ldb_add(parentkd->ldb, msg);
 418         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 419                 return WERR_ALREADY_EXISTS;
 420         }
 421
 422         if (ret != LDB_SUCCESS) {
 423                 DEBUG(1, ("ldb_add: %s\n", ldb_errstring(parentkd->ldb)));
 424                 return WERR_FOOBAR;
 425         }
 426
 427         DEBUG(2, ("key added: %s\n", ldb_dn_get_linearized(msg->dn)));
 428
 429         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 430         newkd->ldb = talloc_reference(newkd, parentkd->ldb);
 431         newkd->key.ops = &reg_backend_ldb;
 432         newkd->dn = talloc_steal(newkd, msg->dn);
 433
 434         *newkey = (struct hive_key *)newkd;
 435
 436         /* reset cache */
 437         talloc_free(parentkd->subkeys);
 438         parentkd->subkeys = NULL;
 439
 440         return WERR_OK;
 441 }
 442
 443 static WERROR ldb_del_value (struct hive_key *key, const char *child)
 444 {
 445         int ret;
 446         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 447         struct ldb_dn *childdn;
 448
 449         childdn = ldb_dn_copy(kd->ldb, kd->dn);
 450         if (!ldb_dn_add_child_fmt(childdn, "value=%s",
 451                                   reg_ldb_escape(childdn, child)))
 452         {
 453                 talloc_free(childdn);
 454                 return WERR_FOOBAR;
 455         }
 456
 457         ret = ldb_delete(kd->ldb, childdn);
 458
 459         talloc_free(childdn);
 460
 461         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 462                 return WERR_BADFILE;
 463         } else if (ret != LDB_SUCCESS) {
 464                 DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 465                 return WERR_FOOBAR;
 466         }
 467
 468         /* reset cache */
 469         talloc_free(kd->values);
 470         kd->values = NULL;
 471
 472         return WERR_OK;
 473 }
 474
 475 static WERROR ldb_del_key(const struct hive_key *key, const char *name)
 476 {
 477         int i, ret;
 478         struct ldb_key_data *parentkd = talloc_get_type(key, struct ldb_key_data);
 479         struct ldb_dn *ldap_path;
 480         TALLOC_CTX *mem_ctx = talloc_init("ldb_del_key");
 481         struct ldb_context *c = parentkd->ldb;
 482         struct ldb_result *res_keys;
 483         struct ldb_result *res_vals;
 484         WERROR werr;
 485         struct hive_key *hk;
 486
 487         /* Verify key exists by opening it */
 488         werr = ldb_open_key(mem_ctx, key, name, &hk);
 489         if (!W_ERROR_IS_OK(werr)) {
 490                 talloc_free(mem_ctx);
 491                 return werr;
 492         }
 493
 494         ldap_path = reg_path_to_ldb(mem_ctx, key, name, NULL);
 495         if (!ldap_path) {
 496                 talloc_free(mem_ctx);
 497                 return WERR_FOOBAR;
 498         }
 499
 500         /* Search for subkeys */
 501         ret = ldb_search(c, ldap_path, LDB_SCOPE_ONELEVEL,
 502                          "(key=*)", NULL, &res_keys);
 503
 504         if (ret != LDB_SUCCESS) {
 505                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 506                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 507                 talloc_free(mem_ctx);
 508                 return WERR_FOOBAR;
 509         }
 510
 511         /* Search for values */
 512         ret = ldb_search(c, ldap_path, LDB_SCOPE_ONELEVEL,
 513                          "(value=*)", NULL, &res_vals);
 514
 515         if (ret != LDB_SUCCESS) {
 516                 DEBUG(0, ("Error getting values for '%s': %s\n",
 517                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 518                 talloc_free(mem_ctx);
 519                 return WERR_FOOBAR;
 520         }
 521
 522         /* Start an explicit transaction */
 523         ret = ldb_transaction_start(c);
 524
 525         if (ret != LDB_SUCCESS) {
 526                 DEBUG(0, ("ldb_transaction_start: %s\n", ldb_errstring(c)));
 527                 talloc_free(mem_ctx);
 528                 return WERR_FOOBAR;
 529         }
 530
 531         if (res_keys->count || res_vals->count)
 532         {
 533                 /* Delete any subkeys */
 534                 for (i = 0; i < res_keys->count; i++)
 535                 {
 536                         werr = ldb_del_key(hk, ldb_msg_find_attr_as_string(
 537                                                         res_keys->msgs[i],
 538                                                         "key", NULL));
 539                         if (!W_ERROR_IS_OK(werr)) {
 540                                 ret = ldb_transaction_cancel(c);
 541                                 talloc_free(mem_ctx);
 542                                 return werr;
 543                         }
 544                 }
 545
 546                 /* Delete any values */
 547                 for (i = 0; i < res_vals->count; i++)
 548                 {
 549                         werr = ldb_del_value(hk, ldb_msg_find_attr_as_string(
 550                                                         res_vals->msgs[i],
 551                                                         "value", NULL));
 552                         if (!W_ERROR_IS_OK(werr)) {
 553                                 ret = ldb_transaction_cancel(c);
 554                                 talloc_free(mem_ctx);
 555                                 return werr;
 556                         }
 557                 }
 558         }
 559
 560         /* Delete the key itself */
 561         ret = ldb_delete(c, ldap_path);
 562
 563         if (ret != LDB_SUCCESS)
 564         {
 565                 DEBUG(1, ("ldb_del_key: %s\n", ldb_errstring(c)));
 566                 ret = ldb_transaction_cancel(c);
 567                 talloc_free(mem_ctx);
 568                 return WERR_FOOBAR;
 569         }
 570
 571         /* Commit the transaction */
 572         ret = ldb_transaction_commit(c);
 573
 574         if (ret != LDB_SUCCESS)
 575         {
 576                 DEBUG(0, ("ldb_transaction_commit: %s\n", ldb_errstring(c)));
 577                 ret = ldb_transaction_cancel(c);
 578                 talloc_free(mem_ctx);
 579                 return WERR_FOOBAR;
 580         }
 581
 582         talloc_free(mem_ctx);
 583
 584         /* reset cache */
 585         talloc_free(parentkd->subkeys);
 586         parentkd->subkeys = NULL;
 587
 588         return WERR_OK;
 589 }
 590
 591 static WERROR ldb_set_value(struct hive_key *parent,
 592                             const char *name, uint32_t type,
 593                             const DATA_BLOB data)
 594 {
 595         struct ldb_message *msg;
 596         struct ldb_key_data *kd = talloc_get_type(parent, struct ldb_key_data);
 597         int ret;
 598         TALLOC_CTX *mem_ctx = talloc_init("ldb_set_value");
 599
 600         msg = reg_ldb_pack_value(kd->ldb, mem_ctx, name, type, data);
 601
 602         msg->dn = ldb_dn_copy(msg, kd->dn);
 603         if (!ldb_dn_add_child_fmt(msg->dn, "value=%s",
 604                                   reg_ldb_escape(mem_ctx, name)))
 605         {
 606                 talloc_free(mem_ctx);
 607                 return WERR_FOOBAR;
 608         }
 609
 610         ret = ldb_add(kd->ldb, msg);
 611         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 612                 int i;
 613                 for (i = 0; i < msg->num_elements; i++) {
 614                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 615                 }
 616                 ret = ldb_modify(kd->ldb, msg);
 617         }
 618
 619         if (ret != LDB_SUCCESS) {
 620                 DEBUG(1, ("ldb_msg_add: %s\n", ldb_errstring(kd->ldb)));
 621                 talloc_free(mem_ctx);
 622                 return WERR_FOOBAR;
 623         }
 624
 625         /* reset cache */
 626         talloc_free(kd->values);
 627         kd->values = NULL;
 628
 629         talloc_free(mem_ctx);
 630         return WERR_OK;
 631 }
 632
 633 static WERROR ldb_get_key_info(TALLOC_CTX *mem_ctx,
 634                                const struct hive_key *key,
 635                                const char **classname,
 636                                uint32_t *num_subkeys,
 637                                uint32_t *num_values,
 638                                NTTIME *last_change_time,
 639                                uint32_t *max_subkeynamelen,
 640                                uint32_t *max_valnamelen,
 641                                uint32_t *max_valbufsize)
 642 {
 643         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 644
 645         if (kd->subkeys == NULL) {
 646                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 647         }
 648
 649         if (kd->values == NULL) {
 650                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 651         }
 652
 653         /* FIXME */
 654         if (classname != NULL)
 655                 *classname = NULL;
 656
 657         if (num_subkeys != NULL) {
 658                 *num_subkeys = kd->subkey_count;
 659         }
 660
 661         if (num_values != NULL) {
 662                 *num_values = kd->value_count;
 663         }
 664
 665         if (last_change_time != NULL)
 666                 *last_change_time = 0;
 667
 668         if (max_subkeynamelen != NULL) {
 669                 int i;
 670                 struct ldb_message_element *el;
 671
 672                 *max_subkeynamelen = 0;
 673
 674                 for (i = 0; i < kd->subkey_count; i++) {
 675                         el = ldb_msg_find_element(kd->subkeys[i], "key");
 676                         *max_subkeynamelen = MAX(*max_subkeynamelen, el->values[0].length);
 677                 }
 678         }
 679
 680         if (max_valnamelen != NULL || max_valbufsize != NULL) {
 681                 int i;
 682                 struct ldb_message_element *el;
 683                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 684
 685                 if (max_valbufsize != NULL)
 686                         *max_valbufsize = 0;
 687
 688                 if (max_valnamelen != NULL)
 689                         *max_valnamelen = 0;
 690
 691                 for (i = 0; i < kd->value_count; i++) {
 692                         if (max_valnamelen != NULL) {
 693                                 el = ldb_msg_find_element(kd->values[i], "value");
 694                                 *max_valnamelen = MAX(*max_valnamelen, el->values[0].length);
 695                         }
 696
 697                         if (max_valbufsize != NULL) {
 698                                 DATA_BLOB data;
 699                                 reg_ldb_unpack_value(mem_ctx, kd->values[i], NULL,
 700                                                      NULL, &data);
 701                                 *max_valbufsize = MAX(*max_valbufsize, data.length);
 702                                 talloc_free(data.data);
 703                         }
 704                 }
 705         }
 706
 707         return WERR_OK;
 708 }
 709
 710 static struct hive_operations reg_backend_ldb = {
 711         .name = "ldb",
 712         .add_key = ldb_add_key,
 713         .del_key = ldb_del_key,
 714         .get_key_by_name = ldb_open_key,
 715         .enum_value = ldb_get_value_by_id,
 716         .enum_key = ldb_get_subkey_by_id,
 717         .set_value = ldb_set_value,
 718         .get_value_by_name = ldb_get_value,
 719         .delete_value = ldb_del_value,
 720         .get_key_info = ldb_get_key_info,
 721 };