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
 415         if (name == NULL) {
 416                 return WERR_INVALID_PARAM;
 417         }
 418
 419         if (name[0] == '\0') {
 420                 /* default value */
 421                 return ldb_get_default_value(mem_ctx, k, NULL, data_type, data);
 422         } else {
 423                 /* normal value */
 424                 ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 425                                  NULL, "(value=%s)", name);
 426
 427                 if (ret != LDB_SUCCESS) {
 428                         DEBUG(0, ("Error getting values for '%s': %s\n",
 429                                 ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 430                         return WERR_FOOBAR;
 431                 }
 432
 433                 if (res->count == 0)
 434                         return WERR_BADFILE;
 435
 436                 reg_ldb_unpack_value(mem_ctx, res->msgs[0], NULL, data_type, data);
 437
 438                 talloc_free(res);
 439         }
 440
 441         return WERR_OK;
 442 }
 443
 444 static WERROR ldb_open_key(TALLOC_CTX *mem_ctx, const struct hive_key *h,
 445                            const char *name, struct hive_key **key)
 446 {
 447         struct ldb_result *res;
 448         struct ldb_dn *ldap_path;
 449         int ret;
 450         struct ldb_key_data *newkd;
 451         struct ldb_key_data *kd = talloc_get_type(h, struct ldb_key_data);
 452         struct ldb_context *c = kd->ldb;
 453
 454         ldap_path = reg_path_to_ldb(mem_ctx, h, name, NULL);
 455         W_ERROR_HAVE_NO_MEMORY(ldap_path);
 456
 457         ret = ldb_search(c, mem_ctx, &res, ldap_path, LDB_SCOPE_BASE, NULL, "(key=*)");
 458
 459         if (ret != LDB_SUCCESS) {
 460                 DEBUG(3, ("Error opening key '%s': %s\n",
 461                         ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 462                 return WERR_FOOBAR;
 463         } else if (res->count == 0) {
 464                 DEBUG(3, ("Key '%s' not found\n",
 465                         ldb_dn_get_linearized(ldap_path)));
 466                 talloc_free(res);
 467                 return WERR_BADFILE;
 468         }
 469
 470         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 471         newkd->key.ops = &reg_backend_ldb;
 472         newkd->ldb = talloc_reference(newkd, kd->ldb);
 473         newkd->dn = ldb_dn_copy(mem_ctx, res->msgs[0]->dn);
 474
 475         *key = (struct hive_key *)newkd;
 476
 477         return WERR_OK;
 478 }
 479
 480 WERROR reg_open_ldb_file(TALLOC_CTX *parent_ctx, const char *location,
 481                          struct auth_session_info *session_info,
 482                          struct cli_credentials *credentials,
 483                          struct tevent_context *ev_ctx,
 484                          struct loadparm_context *lp_ctx,
 485                          struct hive_key **k)
 486 {
 487         struct ldb_key_data *kd;
 488         struct ldb_context *wrap;
 489         struct ldb_message *attrs_msg;
 490
 491         if (location == NULL)
 492                 return WERR_INVALID_PARAM;
 493
 494         wrap = ldb_wrap_connect(parent_ctx, ev_ctx, lp_ctx,
 495                                 location, session_info, credentials, 0);
 496
 497         if (wrap == NULL) {
 498                 DEBUG(1, (__FILE__": unable to connect\n"));
 499                 return WERR_FOOBAR;
 500         }
 501
 502         attrs_msg = ldb_msg_new(wrap);
 503         W_ERROR_HAVE_NO_MEMORY(attrs_msg);
 504         attrs_msg->dn = ldb_dn_new(attrs_msg, wrap, "@ATTRIBUTES");
 505         W_ERROR_HAVE_NO_MEMORY(attrs_msg->dn);
 506         ldb_msg_add_string(attrs_msg, "key", "CASE_INSENSITIVE");
 507         ldb_msg_add_string(attrs_msg, "value", "CASE_INSENSITIVE");
 508
 509         ldb_add(wrap, attrs_msg);
 510
 511         ldb_set_debug_stderr(wrap);
 512
 513         kd = talloc_zero(parent_ctx, struct ldb_key_data);
 514         kd->key.ops = &reg_backend_ldb;
 515         kd->ldb = talloc_reference(kd, wrap);
 516         talloc_set_destructor (kd, reg_close_ldb_key);
 517         kd->dn = ldb_dn_new(kd, wrap, "hive=NONE");
 518
 519         *k = (struct hive_key *)kd;
 520
 521         return WERR_OK;
 522 }
 523
 524 static WERROR ldb_add_key(TALLOC_CTX *mem_ctx, const struct hive_key *parent,
 525                           const char *name, const char *classname,
 526                           struct security_descriptor *sd,
 527                           struct hive_key **newkey)
 528 {
 529         struct ldb_key_data *parentkd = discard_const_p(struct ldb_key_data, parent);
 530         struct ldb_message *msg;
 531         struct ldb_key_data *newkd;
 532         int ret;
 533
 534         msg = ldb_msg_new(mem_ctx);
 535         W_ERROR_HAVE_NO_MEMORY(msg);
 536
 537         msg->dn = reg_path_to_ldb(msg, parent, name, NULL);
 538         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 539
 540         ldb_msg_add_string(msg, "key", talloc_strdup(mem_ctx, name));
 541         if (classname != NULL)
 542                 ldb_msg_add_string(msg, "classname",
 543                                    talloc_strdup(mem_ctx, classname));
 544
 545         ret = ldb_add(parentkd->ldb, msg);
 546         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 547                 return WERR_ALREADY_EXISTS;
 548         }
 549
 550         if (ret != LDB_SUCCESS) {
 551                 DEBUG(1, ("ldb_add: %s\n", ldb_errstring(parentkd->ldb)));
 552                 return WERR_FOOBAR;
 553         }
 554
 555         DEBUG(2, ("key added: %s\n", ldb_dn_get_linearized(msg->dn)));
 556
 557         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 558         W_ERROR_HAVE_NO_MEMORY(newkd);
 559         newkd->ldb = talloc_reference(newkd, parentkd->ldb);
 560         newkd->key.ops = &reg_backend_ldb;
 561         newkd->dn = talloc_steal(newkd, msg->dn);
 562
 563         *newkey = (struct hive_key *)newkd;
 564
 565         /* reset cache */
 566         talloc_free(parentkd->subkeys);
 567         parentkd->subkeys = NULL;
 568
 569         return WERR_OK;
 570 }
 571
 572 static WERROR ldb_del_value (struct hive_key *key, const char *child)
 573 {
 574         int ret;
 575         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 576         TALLOC_CTX *mem_ctx;
 577         struct ldb_message *msg;
 578         struct ldb_dn *childdn;
 579
 580         if ((child == NULL) || (child[0] == '\0')) {
 581                 /* default value */
 582                 mem_ctx = talloc_init("ldb_del_value");
 583
 584                 msg = talloc_zero(mem_ctx, struct ldb_message);
 585                 W_ERROR_HAVE_NO_MEMORY(msg);
 586                 msg->dn = ldb_dn_copy(msg, kd->dn);
 587                 W_ERROR_HAVE_NO_MEMORY(msg->dn);
 588                 ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 589                 ldb_msg_add_empty(msg, "type", LDB_FLAG_MOD_DELETE, NULL);
 590
 591                 ret = ldb_modify(kd->ldb, msg);
 592                 if (ret != LDB_SUCCESS) {
 593                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 594                         talloc_free(mem_ctx);
 595                         return WERR_FOOBAR;
 596                 }
 597
 598                 talloc_free(mem_ctx);
 599         } else {
 600                 /* normal value */
 601                 childdn = ldb_dn_copy(kd->ldb, kd->dn);
 602                 if (!ldb_dn_add_child_fmt(childdn, "value=%s",
 603                                   reg_ldb_escape(childdn, child)))
 604                 {
 605                         talloc_free(childdn);
 606                         return WERR_FOOBAR;
 607                 }
 608
 609                 ret = ldb_delete(kd->ldb, childdn);
 610
 611                 talloc_free(childdn);
 612
 613                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 614                         return WERR_BADFILE;
 615                 } else if (ret != LDB_SUCCESS) {
 616                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 617                         return WERR_FOOBAR;
 618                 }
 619         }
 620
 621         /* reset cache */
 622         talloc_free(kd->values);
 623         kd->values = NULL;
 624
 625         return WERR_OK;
 626 }
 627
 628 static WERROR ldb_del_key(const struct hive_key *key, const char *name)
 629 {
 630         unsigned int i;
 631         int ret;
 632         struct ldb_key_data *parentkd = talloc_get_type(key, struct ldb_key_data);
 633         struct ldb_dn *ldap_path;
 634         TALLOC_CTX *mem_ctx = talloc_init("ldb_del_key");
 635         struct ldb_context *c = parentkd->ldb;
 636         struct ldb_result *res_keys;
 637         struct ldb_result *res_vals;
 638         WERROR werr;
 639         struct hive_key *hk;
 640
 641         /* Verify key exists by opening it */
 642         werr = ldb_open_key(mem_ctx, key, name, &hk);
 643         if (!W_ERROR_IS_OK(werr)) {
 644                 talloc_free(mem_ctx);
 645                 return werr;
 646         }
 647
 648         ldap_path = reg_path_to_ldb(mem_ctx, key, name, NULL);
 649         W_ERROR_HAVE_NO_MEMORY(ldap_path);
 650
 651         /* Search for subkeys */
 652         ret = ldb_search(c, mem_ctx, &res_keys, ldap_path, LDB_SCOPE_ONELEVEL,
 653                          NULL, "(key=*)");
 654
 655         if (ret != LDB_SUCCESS) {
 656                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 657                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 658                 talloc_free(mem_ctx);
 659                 return WERR_FOOBAR;
 660         }
 661
 662         /* Search for values */
 663         ret = ldb_search(c, mem_ctx, &res_vals, ldap_path, LDB_SCOPE_ONELEVEL,
 664                          NULL, "(value=*)");
 665
 666         if (ret != LDB_SUCCESS) {
 667                 DEBUG(0, ("Error getting values for '%s': %s\n",
 668                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 669                 talloc_free(mem_ctx);
 670                 return WERR_FOOBAR;
 671         }
 672
 673         /* Start an explicit transaction */
 674         ret = ldb_transaction_start(c);
 675
 676         if (ret != LDB_SUCCESS) {
 677                 DEBUG(0, ("ldb_transaction_start: %s\n", ldb_errstring(c)));
 678                 talloc_free(mem_ctx);
 679                 return WERR_FOOBAR;
 680         }
 681
 682         if (res_keys->count || res_vals->count)
 683         {
 684                 /* Delete any subkeys */
 685                 for (i = 0; i < res_keys->count; i++)
 686                 {
 687                         werr = ldb_del_key(hk, ldb_msg_find_attr_as_string(
 688                                                         res_keys->msgs[i],
 689                                                         "key", NULL));
 690                         if (!W_ERROR_IS_OK(werr)) {
 691                                 ret = ldb_transaction_cancel(c);
 692                                 talloc_free(mem_ctx);
 693                                 return werr;
 694                         }
 695                 }
 696
 697                 /* Delete any values */
 698                 for (i = 0; i < res_vals->count; i++)
 699                 {
 700                         werr = ldb_del_value(hk, ldb_msg_find_attr_as_string(
 701                                                         res_vals->msgs[i],
 702                                                         "value", NULL));
 703                         if (!W_ERROR_IS_OK(werr)) {
 704                                 ret = ldb_transaction_cancel(c);
 705                                 talloc_free(mem_ctx);
 706                                 return werr;
 707                         }
 708                 }
 709         }
 710
 711         /* Delete the key itself */
 712         ret = ldb_delete(c, ldap_path);
 713
 714         if (ret != LDB_SUCCESS)
 715         {
 716                 DEBUG(1, ("ldb_del_key: %s\n", ldb_errstring(c)));
 717                 ret = ldb_transaction_cancel(c);
 718                 talloc_free(mem_ctx);
 719                 return WERR_FOOBAR;
 720         }
 721
 722         /* Commit the transaction */
 723         ret = ldb_transaction_commit(c);
 724
 725         if (ret != LDB_SUCCESS)
 726         {
 727                 DEBUG(0, ("ldb_transaction_commit: %s\n", ldb_errstring(c)));
 728                 ret = ldb_transaction_cancel(c);
 729                 talloc_free(mem_ctx);
 730                 return WERR_FOOBAR;
 731         }
 732
 733         talloc_free(mem_ctx);
 734
 735         /* reset cache */
 736         talloc_free(parentkd->subkeys);
 737         parentkd->subkeys = NULL;
 738
 739         return WERR_OK;
 740 }
 741
 742 static WERROR ldb_set_value(struct hive_key *parent,
 743                             const char *name, uint32_t type,
 744                             const DATA_BLOB data)
 745 {
 746         struct ldb_message *msg;
 747         struct ldb_key_data *kd = talloc_get_type(parent, struct ldb_key_data);
 748         unsigned int i;
 749         int ret;
 750         TALLOC_CTX *mem_ctx = talloc_init("ldb_set_value");
 751
 752         msg = reg_ldb_pack_value(kd->ldb, mem_ctx, name, type, data);
 753         W_ERROR_HAVE_NO_MEMORY(msg);
 754
 755         msg->dn = ldb_dn_copy(msg, kd->dn);
 756         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 757
 758         if ((name != NULL) && (name[0] != '\0')) {
 759                 /* For a default value, we add/overwrite the attributes to/of the hive.
 760                    For a normal value, we create a new child. */
 761                 if (!ldb_dn_add_child_fmt(msg->dn, "value=%s",
 762                                   reg_ldb_escape(mem_ctx, name)))
 763                 {
 764                         talloc_free(mem_ctx);
 765                         return WERR_FOOBAR;
 766                 }
 767         }
 768
 769         /* Try first a "modify" and if this doesn't work do try an "add" */
 770         for (i = 0; i < msg->num_elements; i++) {
 771                 if (msg->elements[i].flags != LDB_FLAG_MOD_DELETE) {
 772                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 773                 }
 774         }
 775         ret = ldb_modify(kd->ldb, msg);
 776         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 777                 i = 0;
 778                 while (i < msg->num_elements) {
 779                         if (msg->elements[i].flags == LDB_FLAG_MOD_DELETE) {
 780                                 ldb_msg_remove_element(msg, &msg->elements[i]);
 781                         } else {
 782                                 ++i;
 783                         }
 784                 }
 785                 ret = ldb_add(kd->ldb, msg);
 786         }
 787         if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
 788                 /* ignore this -> the value didn't exist and also now doesn't */
 789                 ret = LDB_SUCCESS;
 790         }
 791
 792         if (ret != LDB_SUCCESS) {
 793                 DEBUG(1, ("ldb_set_value: %s\n", ldb_errstring(kd->ldb)));
 794                 talloc_free(mem_ctx);
 795                 return WERR_FOOBAR;
 796         }
 797
 798         /* reset cache */
 799         talloc_free(kd->values);
 800         kd->values = NULL;
 801
 802         talloc_free(mem_ctx);
 803         return WERR_OK;
 804 }
 805
 806 static WERROR ldb_get_key_info(TALLOC_CTX *mem_ctx,
 807                                const struct hive_key *key,
 808                                const char **classname,
 809                                uint32_t *num_subkeys,
 810                                uint32_t *num_values,
 811                                NTTIME *last_change_time,
 812                                uint32_t *max_subkeynamelen,
 813                                uint32_t *max_valnamelen,
 814                                uint32_t *max_valbufsize)
 815 {
 816         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 817
 818         /* Initialization */
 819         if (classname != NULL)
 820                 *classname = NULL;
 821         if (num_subkeys != NULL)
 822                 *num_subkeys = 0;
 823         if (num_values != NULL)
 824                 *num_values = 0;
 825         if (last_change_time != NULL)
 826                 *last_change_time = 0;
 827         if (max_subkeynamelen != NULL)
 828                 *max_subkeynamelen = 0;
 829         if (max_valnamelen != NULL)
 830                 *max_valnamelen = 0;
 831         if (max_valbufsize != NULL)
 832                 *max_valbufsize = 0;
 833
 834         if (kd->subkeys == NULL) {
 835                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 836         }
 837
 838         if (kd->values == NULL) {
 839                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 840         }
 841
 842         if (num_subkeys != NULL) {
 843                 *num_subkeys = kd->subkey_count;
 844         }
 845         if (num_values != NULL) {
 846                 *num_values = kd->value_count;
 847         }
 848
 849
 850         if (max_subkeynamelen != NULL) {
 851                 unsigned int i;
 852                 struct ldb_message_element *el;
 853
 854                 *max_subkeynamelen = 0;
 855
 856                 for (i = 0; i < kd->subkey_count; i++) {
 857                         el = ldb_msg_find_element(kd->subkeys[i], "key");
 858                         *max_subkeynamelen = MAX(*max_subkeynamelen, el->values[0].length);
 859                 }
 860         }
 861
 862         if (max_valnamelen != NULL || max_valbufsize != NULL) {
 863                 unsigned int i;
 864                 struct ldb_message_element *el;
 865                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 866
 867                 if (max_valbufsize != NULL)
 868                         *max_valbufsize = 0;
 869
 870                 if (max_valnamelen != NULL)
 871                         *max_valnamelen = 0;
 872
 873                 for (i = 0; i < kd->value_count; i++) {
 874                         if (max_valnamelen != NULL) {
 875                                 el = ldb_msg_find_element(kd->values[i], "value");
 876                                 *max_valnamelen = MAX(*max_valnamelen, el->values[0].length);
 877                         }
 878
 879                         if (max_valbufsize != NULL) {
 880                                 uint32_t data_type;
 881                                 DATA_BLOB data;
 882                                 reg_ldb_unpack_value(mem_ctx,
 883                                                      kd->values[i], NULL,
 884                                                      &data_type, &data);
 885                                 *max_valbufsize = MAX(*max_valbufsize, data.length);
 886                                 talloc_free(data.data);
 887                         }
 888                 }
 889         }
 890
 891         return WERR_OK;
 892 }
 893
 894 static struct hive_operations reg_backend_ldb = {
 895         .name = "ldb",
 896         .add_key = ldb_add_key,
 897         .del_key = ldb_del_key,
 898         .get_key_by_name = ldb_open_key,
 899         .enum_value = ldb_get_value_by_id,
 900         .enum_key = ldb_get_subkey_by_id,
 901         .set_value = ldb_set_value,
 902         .get_value_by_name = ldb_get_value,
 903         .delete_value = ldb_del_value,
 904         .get_key_info = ldb_get_key_info,
 905 };