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,
  40                                  struct smb_iconv_convenience *iconv_convenience,
  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         value_type = ldb_msg_find_attr_as_uint(msg, "type", 0);
  54         if (type != NULL)
  55                 *type = value_type;
  56         val = ldb_msg_find_ldb_val(msg, "data");
  57
  58         switch (value_type)
  59         {
  60         case REG_SZ:
  61         case REG_EXPAND_SZ:
  62                 data->length = convert_string_talloc(mem_ctx, iconv_convenience, CH_UTF8, CH_UTF16,
  63                                                      val->data, val->length,
  64                                                      (void **)&data->data);
  65                 break;
  66
  67         case REG_DWORD: {
  68                 uint32_t tmp = strtoul((char *)val->data, NULL, 0);
  69                 *data = data_blob_talloc(mem_ctx, &tmp, 4);
  70                 }
  71                 break;
  72
  73         default:
  74                 *data = data_blob_talloc(mem_ctx, val->data, val->length);
  75                 break;
  76         }
  77 }
  78
  79 static struct ldb_message *reg_ldb_pack_value(struct ldb_context *ctx,
  80                                               TALLOC_CTX *mem_ctx,
  81                                               const char *name,
  82                                               uint32_t type, DATA_BLOB data)
  83 {
  84         struct ldb_val val;
  85         struct ldb_message *msg = talloc_zero(mem_ctx, struct ldb_message);
  86         char *type_s;
  87
  88         ldb_msg_add_string(msg, "value", talloc_strdup(mem_ctx, name));
  89
  90         switch (type) {
  91         case REG_SZ:
  92         case REG_EXPAND_SZ:
  93                 val.length = convert_string_talloc(mem_ctx, lp_iconv_convenience(global_loadparm), CH_UTF16, CH_UNIX,
  94                                                    (void *)data.data,
  95                                                    data.length,
  96                                                    (void **)&val.data);
  97                 ldb_msg_add_value(msg, "data", &val, NULL);
  98                 break;
  99
 100         case REG_DWORD:
 101                 ldb_msg_add_string(msg, "data",
 102                                    talloc_asprintf(mem_ctx, "0x%x",
 103                                                    IVAL(data.data, 0)));
 104                 break;
 105         default:
 106                 ldb_msg_add_value(msg, "data", &data, NULL);
 107         }
 108
 109
 110         type_s = talloc_asprintf(mem_ctx, "%u", type);
 111         ldb_msg_add_string(msg, "type", type_s);
 112
 113         return msg;
 114 }
 115
 116 static char *reg_ldb_escape(TALLOC_CTX *mem_ctx, const char *value)
 117 {
 118         struct ldb_val val;
 119
 120         val.data = discard_const_p(uint8_t, value);
 121         val.length = strlen(value);
 122
 123         return ldb_dn_escape_value(mem_ctx, val);
 124 }
 125
 126 static int reg_close_ldb_key(struct ldb_key_data *key)
 127 {
 128         if (key->subkeys != NULL) {
 129                 talloc_free(key->subkeys);
 130                 key->subkeys = NULL;
 131         }
 132
 133         if (key->values != NULL) {
 134                 talloc_free(key->values);
 135                 key->values = NULL;
 136         }
 137         return 0;
 138 }
 139
 140 static struct ldb_dn *reg_path_to_ldb(TALLOC_CTX *mem_ctx,
 141                                       const struct hive_key *from,
 142                                       const char *path, const char *add)
 143 {
 144         TALLOC_CTX *local_ctx;
 145         struct ldb_dn *ret;
 146         char *mypath = talloc_strdup(mem_ctx, path);
 147         char *begin;
 148         struct ldb_key_data *kd = talloc_get_type(from, struct ldb_key_data);
 149         struct ldb_context *ldb = kd->ldb;
 150
 151         local_ctx = talloc_new(mem_ctx);
 152
 153         if (add) {
 154                 ret = ldb_dn_new(mem_ctx, ldb, add);
 155         } else {
 156                 ret = ldb_dn_new(mem_ctx, ldb, NULL);
 157         }
 158         if (!ldb_dn_validate(ret)) {
 159                 talloc_free(ret);
 160                 talloc_free(local_ctx);
 161                 return NULL;
 162         }
 163
 164         while (mypath) {
 165                 char *keyname;
 166
 167                 begin = strrchr(mypath, '\\');
 168
 169                 if (begin) keyname = begin + 1;
 170                 else keyname = mypath;
 171
 172                 if(strlen(keyname)) {
 173                         if (!ldb_dn_add_base_fmt(ret, "key=%s",
 174                                                  reg_ldb_escape(local_ctx,
 175                                                                 keyname)))
 176                         {
 177                                 talloc_free(local_ctx);
 178                                 return NULL;
 179                         }
 180                 }
 181
 182                 if(begin) {
 183                         *begin = '\0';
 184                 } else {
 185                         break;
 186                 }
 187         }
 188
 189         ldb_dn_add_base(ret, kd->dn);
 190
 191         talloc_free(local_ctx);
 192
 193         return ret;
 194 }
 195
 196 static WERROR cache_subkeys(struct ldb_key_data *kd)
 197 {
 198         struct ldb_context *c = kd->ldb;
 199         struct ldb_result *res;
 200         int ret;
 201
 202         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL, NULL, "(key=*)");
 203
 204         if (ret != LDB_SUCCESS) {
 205                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 206                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 207                 return WERR_FOOBAR;
 208         }
 209
 210         kd->subkey_count = res->count;
 211         kd->subkeys = talloc_steal(kd, res->msgs);
 212         talloc_free(res);
 213
 214         return WERR_OK;
 215 }
 216
 217 static WERROR cache_values(struct ldb_key_data *kd)
 218 {
 219         struct ldb_context *c = kd->ldb;
 220         struct ldb_result *res;
 221         int ret;
 222
 223         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 224                          NULL, "(value=*)");
 225
 226         if (ret != LDB_SUCCESS) {
 227                 DEBUG(0, ("Error getting values for '%s': %s\n",
 228                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 229                 return WERR_FOOBAR;
 230         }
 231         kd->value_count = res->count;
 232         kd->values = talloc_steal(kd, res->msgs);
 233         talloc_free(res);
 234         return WERR_OK;
 235 }
 236
 237
 238 static WERROR ldb_get_subkey_by_id(TALLOC_CTX *mem_ctx,
 239                                    const struct hive_key *k, uint32_t idx,
 240                                    const char **name,
 241                                    const char **classname,
 242                                    NTTIME *last_mod_time)
 243 {
 244         struct ldb_message_element *el;
 245         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 246
 247         /* Do a search if necessary */
 248         if (kd->subkeys == NULL) {
 249                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 250         }
 251
 252         if (idx >= kd->subkey_count)
 253                 return WERR_NO_MORE_ITEMS;
 254
 255         el = ldb_msg_find_element(kd->subkeys[idx], "key");
 256         SMB_ASSERT(el != NULL);
 257         SMB_ASSERT(el->num_values != 0);
 258
 259         if (name != NULL)
 260                 *name = talloc_strdup(mem_ctx, (char *)el->values[0].data);
 261
 262         if (classname != NULL)
 263                 *classname = NULL; /* TODO: Store properly */
 264
 265         if (last_mod_time != NULL)
 266                 *last_mod_time = 0; /* TODO: we need to add this to the
 267                                                 ldb backend properly */
 268
 269         return WERR_OK;
 270 }
 271
 272 static WERROR ldb_get_value_by_id(TALLOC_CTX *mem_ctx, struct hive_key *k,
 273                                   int idx, const char **name,
 274                                   uint32_t *data_type, DATA_BLOB *data)
 275 {
 276         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 277
 278         /* Do the search if necessary */
 279         if (kd->values == NULL) {
 280                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 281         }
 282
 283         if (idx >= kd->value_count)
 284                 return WERR_NO_MORE_ITEMS;
 285
 286         reg_ldb_unpack_value(mem_ctx, lp_iconv_convenience(global_loadparm), kd->values[idx],
 287                              name, data_type, data);
 288
 289         return WERR_OK;
 290 }
 291
 292 static WERROR ldb_get_value(TALLOC_CTX *mem_ctx, struct hive_key *k,
 293                             const char *name, uint32_t *data_type,
 294                             DATA_BLOB *data)
 295 {
 296         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 297         struct ldb_context *c = kd->ldb;
 298         struct ldb_result *res;
 299         int ret;
 300         char *query = talloc_asprintf(mem_ctx, "(value=%s)", name);
 301
 302         ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_ONELEVEL, NULL, "%s", query);
 303
 304         talloc_free(query);
 305
 306         if (ret != LDB_SUCCESS) {
 307                 DEBUG(0, ("Error getting values for '%s': %s\n",
 308                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 309                 talloc_free(res);
 310                 return WERR_FOOBAR;
 311         }
 312
 313         if (res->count == 0) {
 314                 talloc_free(res);
 315                 return WERR_BADFILE;
 316         }
 317
 318         reg_ldb_unpack_value(mem_ctx, lp_iconv_convenience(global_loadparm), res->msgs[0], NULL, data_type, data);
 319
 320         talloc_free(res);
 321         return WERR_OK;
 322 }
 323
 324 static WERROR ldb_open_key(TALLOC_CTX *mem_ctx, const struct hive_key *h,
 325                            const char *name, struct hive_key **key)
 326 {
 327         struct ldb_result *res;
 328         struct ldb_dn *ldap_path;
 329         int ret;
 330         struct ldb_key_data *newkd;
 331         struct ldb_key_data *kd = talloc_get_type(h, struct ldb_key_data);
 332         struct ldb_context *c = kd->ldb;
 333
 334         ldap_path = reg_path_to_ldb(mem_ctx, h, name, NULL);
 335
 336         ret = ldb_search(c, mem_ctx, &res, ldap_path, LDB_SCOPE_BASE, NULL, "(key=*)");
 337
 338         if (ret != LDB_SUCCESS) {
 339                 DEBUG(3, ("Error opening key '%s': %s\n",
 340                         ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 341                 return WERR_FOOBAR;
 342         } else if (res->count == 0) {
 343                 DEBUG(3, ("Key '%s' not found\n",
 344                         ldb_dn_get_linearized(ldap_path)));
 345                 talloc_free(res);
 346                 return WERR_BADFILE;
 347         }
 348
 349         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 350         newkd->key.ops = &reg_backend_ldb;
 351         newkd->ldb = talloc_reference(newkd, kd->ldb);
 352         newkd->dn = ldb_dn_copy(mem_ctx, res->msgs[0]->dn);
 353
 354         *key = (struct hive_key *)newkd;
 355
 356         talloc_free(res);
 357
 358         return WERR_OK;
 359 }
 360
 361 WERROR reg_open_ldb_file(TALLOC_CTX *parent_ctx, const char *location,
 362                          struct auth_session_info *session_info,
 363                          struct cli_credentials *credentials,
 364                          struct event_context *ev_ctx,
 365                          struct loadparm_context *lp_ctx,
 366                          struct hive_key **k)
 367 {
 368         struct ldb_key_data *kd;
 369         struct ldb_context *wrap;
 370         struct ldb_message *attrs_msg;
 371
 372         if (location == NULL)
 373                 return WERR_INVALID_PARAM;
 374
 375         wrap = ldb_wrap_connect(parent_ctx, ev_ctx, lp_ctx,
 376                                 location, session_info, credentials, 0, NULL);
 377
 378         if (wrap == NULL) {
 379                 DEBUG(1, (__FILE__": unable to connect\n"));
 380                 return WERR_FOOBAR;
 381         }
 382
 383         attrs_msg = ldb_msg_new(wrap);
 384         W_ERROR_HAVE_NO_MEMORY(attrs_msg);
 385         attrs_msg->dn = ldb_dn_new(attrs_msg, wrap, "@ATTRIBUTES");
 386         W_ERROR_HAVE_NO_MEMORY(attrs_msg->dn);
 387         ldb_msg_add_string(attrs_msg, "key", "CASE_INSENSITIVE");
 388         ldb_msg_add_string(attrs_msg, "value", "CASE_INSENSITIVE");
 389
 390         ldb_add(wrap, attrs_msg);
 391
 392         ldb_set_debug_stderr(wrap);
 393
 394         kd = talloc_zero(parent_ctx, struct ldb_key_data);
 395         kd->key.ops = &reg_backend_ldb;
 396         kd->ldb = talloc_reference(kd, wrap);
 397         talloc_set_destructor (kd, reg_close_ldb_key);
 398         kd->dn = ldb_dn_new(kd, wrap, "hive=NONE");
 399
 400         *k = (struct hive_key *)kd;
 401
 402         return WERR_OK;
 403 }
 404
 405 static WERROR ldb_add_key(TALLOC_CTX *mem_ctx, const struct hive_key *parent,
 406                           const char *name, const char *classname,
 407                           struct security_descriptor *sd,
 408                           struct hive_key **newkey)
 409 {
 410         struct ldb_key_data *parentkd = discard_const_p(struct ldb_key_data, parent);
 411         struct ldb_message *msg;
 412         struct ldb_key_data *newkd;
 413         int ret;
 414
 415         msg = ldb_msg_new(mem_ctx);
 416
 417         msg->dn = reg_path_to_ldb(msg, parent, name, NULL);
 418
 419         ldb_msg_add_string(msg, "key", talloc_strdup(mem_ctx, name));
 420         if (classname != NULL)
 421                 ldb_msg_add_string(msg, "classname",
 422                                    talloc_strdup(mem_ctx, classname));
 423
 424         ret = ldb_add(parentkd->ldb, msg);
 425         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 426                 return WERR_ALREADY_EXISTS;
 427         }
 428
 429         if (ret != LDB_SUCCESS) {
 430                 DEBUG(1, ("ldb_add: %s\n", ldb_errstring(parentkd->ldb)));
 431                 return WERR_FOOBAR;
 432         }
 433
 434         DEBUG(2, ("key added: %s\n", ldb_dn_get_linearized(msg->dn)));
 435
 436         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 437         newkd->ldb = talloc_reference(newkd, parentkd->ldb);
 438         newkd->key.ops = &reg_backend_ldb;
 439         newkd->dn = talloc_steal(newkd, msg->dn);
 440
 441         *newkey = (struct hive_key *)newkd;
 442
 443         /* reset cache */
 444         talloc_free(parentkd->subkeys);
 445         parentkd->subkeys = NULL;
 446
 447         return WERR_OK;
 448 }
 449
 450 static WERROR ldb_del_value (struct hive_key *key, const char *child)
 451 {
 452         int ret;
 453         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 454         struct ldb_dn *childdn;
 455
 456         childdn = ldb_dn_copy(kd->ldb, kd->dn);
 457         if (!ldb_dn_add_child_fmt(childdn, "value=%s",
 458                                   reg_ldb_escape(childdn, child)))
 459         {
 460                 talloc_free(childdn);
 461                 return WERR_FOOBAR;
 462         }
 463
 464         ret = ldb_delete(kd->ldb, childdn);
 465
 466         talloc_free(childdn);
 467
 468         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 469                 return WERR_BADFILE;
 470         } else if (ret != LDB_SUCCESS) {
 471                 DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 472                 return WERR_FOOBAR;
 473         }
 474
 475         /* reset cache */
 476         talloc_free(kd->values);
 477         kd->values = NULL;
 478
 479         return WERR_OK;
 480 }
 481
 482 static WERROR ldb_del_key(const struct hive_key *key, const char *name)
 483 {
 484         int i, ret;
 485         struct ldb_key_data *parentkd = talloc_get_type(key, struct ldb_key_data);
 486         struct ldb_dn *ldap_path;
 487         TALLOC_CTX *mem_ctx = talloc_init("ldb_del_key");
 488         struct ldb_context *c = parentkd->ldb;
 489         struct ldb_result *res_keys;
 490         struct ldb_result *res_vals;
 491         WERROR werr;
 492         struct hive_key *hk;
 493
 494         /* Verify key exists by opening it */
 495         werr = ldb_open_key(mem_ctx, key, name, &hk);
 496         if (!W_ERROR_IS_OK(werr)) {
 497                 talloc_free(mem_ctx);
 498                 return werr;
 499         }
 500
 501         ldap_path = reg_path_to_ldb(mem_ctx, key, name, NULL);
 502         if (!ldap_path) {
 503                 talloc_free(mem_ctx);
 504                 return WERR_FOOBAR;
 505         }
 506
 507         /* Search for subkeys */
 508         ret = ldb_search(c, mem_ctx, &res_keys, ldap_path, LDB_SCOPE_ONELEVEL,
 509                          NULL, "(key=*)");
 510
 511         if (ret != LDB_SUCCESS) {
 512                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 513                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 514                 talloc_free(mem_ctx);
 515                 return WERR_FOOBAR;
 516         }
 517
 518         /* Search for values */
 519         ret = ldb_search(c, mem_ctx, &res_vals, ldap_path, LDB_SCOPE_ONELEVEL,
 520                          NULL, "(value=*)");
 521
 522         if (ret != LDB_SUCCESS) {
 523                 DEBUG(0, ("Error getting values for '%s': %s\n",
 524                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 525                 talloc_free(mem_ctx);
 526                 return WERR_FOOBAR;
 527         }
 528
 529         /* Start an explicit transaction */
 530         ret = ldb_transaction_start(c);
 531
 532         if (ret != LDB_SUCCESS) {
 533                 DEBUG(0, ("ldb_transaction_start: %s\n", ldb_errstring(c)));
 534                 talloc_free(mem_ctx);
 535                 return WERR_FOOBAR;
 536         }
 537
 538         if (res_keys->count || res_vals->count)
 539         {
 540                 /* Delete any subkeys */
 541                 for (i = 0; i < res_keys->count; i++)
 542                 {
 543                         werr = ldb_del_key(hk, ldb_msg_find_attr_as_string(
 544                                                         res_keys->msgs[i],
 545                                                         "key", NULL));
 546                         if (!W_ERROR_IS_OK(werr)) {
 547                                 ret = ldb_transaction_cancel(c);
 548                                 talloc_free(mem_ctx);
 549                                 return werr;
 550                         }
 551                 }
 552
 553                 /* Delete any values */
 554                 for (i = 0; i < res_vals->count; i++)
 555                 {
 556                         werr = ldb_del_value(hk, ldb_msg_find_attr_as_string(
 557                                                         res_vals->msgs[i],
 558                                                         "value", NULL));
 559                         if (!W_ERROR_IS_OK(werr)) {
 560                                 ret = ldb_transaction_cancel(c);
 561                                 talloc_free(mem_ctx);
 562                                 return werr;
 563                         }
 564                 }
 565         }
 566
 567         /* Delete the key itself */
 568         ret = ldb_delete(c, ldap_path);
 569
 570         if (ret != LDB_SUCCESS)
 571         {
 572                 DEBUG(1, ("ldb_del_key: %s\n", ldb_errstring(c)));
 573                 ret = ldb_transaction_cancel(c);
 574                 talloc_free(mem_ctx);
 575                 return WERR_FOOBAR;
 576         }
 577
 578         /* Commit the transaction */
 579         ret = ldb_transaction_commit(c);
 580
 581         if (ret != LDB_SUCCESS)
 582         {
 583                 DEBUG(0, ("ldb_transaction_commit: %s\n", ldb_errstring(c)));
 584                 ret = ldb_transaction_cancel(c);
 585                 talloc_free(mem_ctx);
 586                 return WERR_FOOBAR;
 587         }
 588
 589         talloc_free(mem_ctx);
 590
 591         /* reset cache */
 592         talloc_free(parentkd->subkeys);
 593         parentkd->subkeys = NULL;
 594
 595         return WERR_OK;
 596 }
 597
 598 static WERROR ldb_set_value(struct hive_key *parent,
 599                             const char *name, uint32_t type,
 600                             const DATA_BLOB data)
 601 {
 602         struct ldb_message *msg;
 603         struct ldb_key_data *kd = talloc_get_type(parent, struct ldb_key_data);
 604         int ret;
 605         TALLOC_CTX *mem_ctx = talloc_init("ldb_set_value");
 606
 607         msg = reg_ldb_pack_value(kd->ldb, mem_ctx, name, type, data);
 608
 609         msg->dn = ldb_dn_copy(msg, kd->dn);
 610         if (!ldb_dn_add_child_fmt(msg->dn, "value=%s",
 611                                   reg_ldb_escape(mem_ctx, name)))
 612         {
 613                 talloc_free(mem_ctx);
 614                 return WERR_FOOBAR;
 615         }
 616
 617         ret = ldb_add(kd->ldb, msg);
 618         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 619                 int i;
 620                 for (i = 0; i < msg->num_elements; i++) {
 621                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 622                 }
 623                 ret = ldb_modify(kd->ldb, msg);
 624         }
 625
 626         if (ret != LDB_SUCCESS) {
 627                 DEBUG(1, ("ldb_msg_add: %s\n", ldb_errstring(kd->ldb)));
 628                 talloc_free(mem_ctx);
 629                 return WERR_FOOBAR;
 630         }
 631
 632         /* reset cache */
 633         talloc_free(kd->values);
 634         kd->values = NULL;
 635
 636         talloc_free(mem_ctx);
 637         return WERR_OK;
 638 }
 639
 640 static WERROR ldb_get_key_info(TALLOC_CTX *mem_ctx,
 641                                const struct hive_key *key,
 642                                const char **classname,
 643                                uint32_t *num_subkeys,
 644                                uint32_t *num_values,
 645                                NTTIME *last_change_time,
 646                                uint32_t *max_subkeynamelen,
 647                                uint32_t *max_valnamelen,
 648                                uint32_t *max_valbufsize)
 649 {
 650         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 651
 652         if (kd->subkeys == NULL) {
 653                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 654         }
 655
 656         if (kd->values == NULL) {
 657                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 658         }
 659
 660         /* FIXME */
 661         if (classname != NULL)
 662                 *classname = NULL;
 663
 664         if (num_subkeys != NULL) {
 665                 *num_subkeys = kd->subkey_count;
 666         }
 667
 668         if (num_values != NULL) {
 669                 *num_values = kd->value_count;
 670         }
 671
 672         if (last_change_time != NULL)
 673                 *last_change_time = 0;
 674
 675         if (max_subkeynamelen != NULL) {
 676                 int i;
 677                 struct ldb_message_element *el;
 678
 679                 *max_subkeynamelen = 0;
 680
 681                 for (i = 0; i < kd->subkey_count; i++) {
 682                         el = ldb_msg_find_element(kd->subkeys[i], "key");
 683                         *max_subkeynamelen = MAX(*max_subkeynamelen, el->values[0].length);
 684                 }
 685         }
 686
 687         if (max_valnamelen != NULL || max_valbufsize != NULL) {
 688                 int i;
 689                 struct ldb_message_element *el;
 690                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 691
 692                 if (max_valbufsize != NULL)
 693                         *max_valbufsize = 0;
 694
 695                 if (max_valnamelen != NULL)
 696                         *max_valnamelen = 0;
 697
 698                 for (i = 0; i < kd->value_count; i++) {
 699                         if (max_valnamelen != NULL) {
 700                                 el = ldb_msg_find_element(kd->values[i], "value");
 701                                 *max_valnamelen = MAX(*max_valnamelen, el->values[0].length);
 702                         }
 703
 704                         if (max_valbufsize != NULL) {
 705                                 DATA_BLOB data;
 706                                 reg_ldb_unpack_value(mem_ctx,
 707                                                      lp_iconv_convenience(global_loadparm),
 708                                                      kd->values[i], NULL,
 709                                                      NULL, &data);
 710                                 *max_valbufsize = MAX(*max_valbufsize, data.length);
 711                                 talloc_free(data.data);
 712                         }
 713                 }
 714         }
 715
 716         return WERR_OK;
 717 }
 718
 719 static struct hive_operations reg_backend_ldb = {
 720         .name = "ldb",
 721         .add_key = ldb_add_key,
 722         .del_key = ldb_del_key,
 723         .get_key_by_name = ldb_open_key,
 724         .enum_value = ldb_get_value_by_id,
 725         .enum_key = ldb_get_subkey_by_id,
 726         .set_value = ldb_set_value,
 727         .get_value_by_name = ldb_get_value,
 728         .delete_value = ldb_del_value,
 729         .get_key_info = ldb_get_key_info,
 730 };