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         const char *classname;
  39 };
  40
  41 static void reg_ldb_unpack_value(TALLOC_CTX *mem_ctx,
  42                                  struct ldb_message *msg,
  43                                  const char **name, uint32_t *type,
  44                                  DATA_BLOB *data)
  45 {
  46         const struct ldb_val *val;
  47         uint32_t value_type;
  48
  49         if (name != NULL) {
  50                 *name = talloc_strdup(mem_ctx,
  51                                       ldb_msg_find_attr_as_string(msg, "value",
  52                                       ""));
  53         }
  54
  55         value_type = ldb_msg_find_attr_as_uint(msg, "type", 0);
  56         *type = value_type;
  57
  58         val = ldb_msg_find_ldb_val(msg, "data");
  59
  60         switch (value_type)
  61         {
  62         case REG_SZ:
  63         case REG_EXPAND_SZ:
  64                 if (val != NULL) {
  65                         /* The data should be provided as UTF16 string */
  66                         convert_string_talloc(mem_ctx, CH_UTF8, CH_UTF16,
  67                                               val->data, val->length,
  68                                               (void **)&data->data, &data->length, false);
  69                 } else {
  70                         data->data = NULL;
  71                         data->length = 0;
  72                 }
  73                 break;
  74
  75         case REG_DWORD:
  76         case REG_DWORD_BIG_ENDIAN:
  77                 if (val != NULL) {
  78                         /* The data is a plain DWORD */
  79                         uint32_t tmp = strtoul((char *)val->data, NULL, 0);
  80                         data->data = talloc_size(mem_ctx, sizeof(uint32_t));
  81                         if (data->data != NULL) {
  82                                 SIVAL(data->data, 0, tmp);
  83                         }
  84                         data->length = sizeof(uint32_t);
  85                 } else {
  86                         data->data = NULL;
  87                         data->length = 0;
  88                 }
  89                 break;
  90
  91         case REG_QWORD:
  92                 if (val != NULL) {
  93                         /* The data is a plain QWORD */
  94                         uint64_t tmp = strtoull((char *)val->data, NULL, 0);
  95                         data->data = talloc_size(mem_ctx, sizeof(uint64_t));
  96                         if (data->data != NULL) {
  97                                 SBVAL(data->data, 0, tmp);
  98                         }
  99                         data->length = sizeof(uint64_t);
 100                 } else {
 101                         data->data = NULL;
 102                         data->length = 0;
 103                 }
 104                 break;
 105
 106         case REG_BINARY:
 107         default:
 108                 if (val != NULL) {
 109                         data->data = talloc_memdup(mem_ctx, val->data,
 110                                                    val->length);
 111                         data->length = val->length;
 112                 } else {
 113                         data->data = NULL;
 114                         data->length = 0;
 115                 }
 116                 break;
 117         }
 118 }
 119
 120 static struct ldb_message *reg_ldb_pack_value(struct ldb_context *ctx,
 121                                               TALLOC_CTX *mem_ctx,
 122                                               const char *name,
 123                                               uint32_t type, DATA_BLOB data)
 124 {
 125         struct ldb_message *msg;
 126         char *name_dup, *type_str;
 127         int ret;
 128
 129         msg = talloc_zero(mem_ctx, struct ldb_message);
 130         if (msg == NULL) {
 131                 return NULL;
 132         }
 133
 134         name_dup = talloc_strdup(msg, name);
 135         if (name_dup == NULL) {
 136                 talloc_free(msg);
 137                 return NULL;
 138         }
 139
 140         ret = ldb_msg_add_string(msg, "value", name_dup);
 141         if (ret != LDB_SUCCESS) {
 142                 talloc_free(msg);
 143                 return NULL;
 144         }
 145
 146         switch (type) {
 147         case REG_SZ:
 148         case REG_EXPAND_SZ:
 149                 if ((data.length > 0) && (data.data != NULL)) {
 150                         struct ldb_val *val;
 151                         bool ret2 = false;
 152
 153                         val = talloc_zero(msg, struct ldb_val);
 154                         if (val == NULL) {
 155                                 talloc_free(msg);
 156                                 return NULL;
 157                         }
 158
 159                         /* The data is provided as UTF16 string */
 160                         ret2 = convert_string_talloc(mem_ctx, CH_UTF16, CH_UTF8,
 161                                                      (void *)data.data, data.length,
 162                                                      (void **)&val->data, &val->length,
 163                                                      false);
 164                         if (ret2) {
 165                                 ret = ldb_msg_add_value(msg, "data", val, NULL);
 166                         } else {
 167                                 /* workaround for non-standard data */
 168                                 ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 169                         }
 170                 } else {
 171                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 172                 }
 173                 break;
 174
 175         case REG_DWORD:
 176         case REG_DWORD_BIG_ENDIAN:
 177                 if ((data.length > 0) && (data.data != NULL)) {
 178                         if (data.length == sizeof(uint32_t)) {
 179                                 char *conv_str;
 180
 181                                 conv_str = talloc_asprintf(msg, "0x%8.8x",
 182                                                            IVAL(data.data, 0));
 183                                 if (conv_str == NULL) {
 184                                         talloc_free(msg);
 185                                         return NULL;
 186                                 }
 187                                 ret = ldb_msg_add_string(msg, "data", conv_str);
 188                         } else {
 189                                 /* workaround for non-standard data */
 190                                 talloc_free(msg);
 191                                 return NULL;
 192                         }
 193                 } else {
 194                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 195                 }
 196                 break;
 197
 198         case REG_QWORD:
 199                 if ((data.length > 0) && (data.data != NULL)) {
 200                         if (data.length == sizeof(uint64_t)) {
 201                                 char *conv_str;
 202
 203                                 conv_str = talloc_asprintf(msg, "0x%16.16llx",
 204                                                            BVAL(data.data, 0));
 205                                 if (conv_str == NULL) {
 206                                         talloc_free(msg);
 207                                         return NULL;
 208                                 }
 209                                 ret = ldb_msg_add_string(msg, "data", conv_str);
 210                         } else {
 211                                 /* workaround for non-standard data */
 212                                 talloc_free(msg);
 213                                 return NULL;
 214
 215                         }
 216                 } else {
 217                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 218                 }
 219                 break;
 220
 221         case REG_BINARY:
 222         default:
 223                 if ((data.length > 0) && (data.data != NULL)) {
 224                         ret = ldb_msg_add_value(msg, "data", &data, NULL);
 225                 } else {
 226                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 227                 }
 228                 break;
 229         }
 230
 231         if (ret != LDB_SUCCESS) {
 232                 talloc_free(msg);
 233                 return NULL;
 234         }
 235
 236         type_str = talloc_asprintf(mem_ctx, "%u", type);
 237         if (type_str == NULL) {
 238                 talloc_free(msg);
 239                 return NULL;
 240         }
 241
 242         ret = ldb_msg_add_string(msg, "type", type_str);
 243         if (ret != LDB_SUCCESS) {
 244                 talloc_free(msg);
 245                 return NULL;
 246         }
 247
 248         return msg;
 249 }
 250
 251 static char *reg_ldb_escape(TALLOC_CTX *mem_ctx, const char *value)
 252 {
 253         struct ldb_val val;
 254
 255         val.data = discard_const_p(uint8_t, value);
 256         val.length = strlen(value);
 257
 258         return ldb_dn_escape_value(mem_ctx, val);
 259 }
 260
 261 static int reg_close_ldb_key(struct ldb_key_data *key)
 262 {
 263         if (key->subkeys != NULL) {
 264                 talloc_free(key->subkeys);
 265                 key->subkeys = NULL;
 266         }
 267
 268         if (key->values != NULL) {
 269                 talloc_free(key->values);
 270                 key->values = NULL;
 271         }
 272         return 0;
 273 }
 274
 275 static struct ldb_dn *reg_path_to_ldb(TALLOC_CTX *mem_ctx,
 276                                       const struct hive_key *from,
 277                                       const char *path, const char *add)
 278 {
 279         struct ldb_dn *ret;
 280         char *mypath = talloc_strdup(mem_ctx, path);
 281         char *begin;
 282         struct ldb_key_data *kd = talloc_get_type(from, struct ldb_key_data);
 283         struct ldb_context *ldb = kd->ldb;
 284
 285         ret = ldb_dn_new(mem_ctx, ldb, add);
 286         if (!ldb_dn_validate(ret)) {
 287                 talloc_free(ret);
 288                 return NULL;
 289         }
 290
 291         while (mypath) {
 292                 char *keyname;
 293
 294                 begin = strrchr(mypath, '\\');
 295
 296                 if (begin) keyname = begin + 1;
 297                 else keyname = mypath;
 298
 299                 if (keyname[0] != '\0') {
 300                         if (!ldb_dn_add_base_fmt(ret, "key=%s",
 301                                                  reg_ldb_escape(mem_ctx,
 302                                                                 keyname)))
 303                         {
 304                                 talloc_free(ret);
 305                                 return NULL;
 306                         }
 307                 }
 308
 309                 if(begin) {
 310                         *begin = '\0';
 311                 } else {
 312                         break;
 313                 }
 314         }
 315
 316         ldb_dn_add_base(ret, kd->dn);
 317
 318         return ret;
 319 }
 320
 321 static WERROR cache_subkeys(struct ldb_key_data *kd)
 322 {
 323         struct ldb_context *c = kd->ldb;
 324         struct ldb_result *res;
 325         int ret;
 326
 327         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 328                          NULL, "(key=*)");
 329         if (ret != LDB_SUCCESS) {
 330                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 331                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 332                 return WERR_FOOBAR;
 333         }
 334
 335         kd->subkey_count = res->count;
 336         kd->subkeys = talloc_steal(kd, res->msgs);
 337         talloc_free(res);
 338
 339         return WERR_OK;
 340 }
 341
 342 static WERROR cache_values(struct ldb_key_data *kd)
 343 {
 344         struct ldb_context *c = kd->ldb;
 345         struct ldb_result *res;
 346         int ret;
 347
 348         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 349                          NULL, "(value=*)");
 350         if (ret != LDB_SUCCESS) {
 351                 DEBUG(0, ("Error getting values for '%s': %s\n",
 352                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 353                 return WERR_FOOBAR;
 354         }
 355
 356         kd->value_count = res->count;
 357         kd->values = talloc_steal(kd, res->msgs);
 358         talloc_free(res);
 359
 360         return WERR_OK;
 361 }
 362
 363
 364 static WERROR ldb_get_subkey_by_id(TALLOC_CTX *mem_ctx,
 365                                    const struct hive_key *k, uint32_t idx,
 366                                    const char **name,
 367                                    const char **classname,
 368                                    NTTIME *last_mod_time)
 369 {
 370         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 371
 372         /* Initialization */
 373         if (name != NULL)
 374                 *name = NULL;
 375         if (classname != NULL)
 376                 *classname = NULL;
 377         if (last_mod_time != NULL)
 378                 *last_mod_time = 0; /* TODO: we need to add this to the
 379                                                 ldb backend properly */
 380
 381         /* Do a search if necessary */
 382         if (kd->subkeys == NULL) {
 383                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 384         }
 385
 386         if (idx >= kd->subkey_count)
 387                 return WERR_NO_MORE_ITEMS;
 388
 389         if (name != NULL)
 390                 *name = talloc_strdup(mem_ctx,
 391                                       ldb_msg_find_attr_as_string(kd->subkeys[idx], "key", NULL));
 392         if (classname != NULL)
 393                 *classname = talloc_strdup(mem_ctx,
 394                                            ldb_msg_find_attr_as_string(kd->subkeys[idx], "classname", NULL));
 395
 396         return WERR_OK;
 397 }
 398
 399 static WERROR ldb_get_default_value(TALLOC_CTX *mem_ctx,
 400                                     const struct hive_key *k,
 401                                     const char **name, uint32_t *data_type,
 402                                     DATA_BLOB *data)
 403 {
 404         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 405         struct ldb_context *c = kd->ldb;
 406         const char* attrs[] = { "data", "type", NULL };
 407         struct ldb_result *res;
 408         int ret;
 409
 410         ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_BASE, attrs, "(dn=*)");
 411
 412         if (ret != LDB_SUCCESS) {
 413                 DEBUG(0, ("Error getting default value for '%s': %s\n",
 414                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 415                 return WERR_FOOBAR;
 416         }
 417
 418         if (res->count == 0 || res->msgs[0]->num_elements == 0)
 419                 return WERR_BADFILE;
 420
 421         if ((data_type != NULL) && (data != NULL)) {
 422                 reg_ldb_unpack_value(mem_ctx, res->msgs[0], name, data_type,
 423                                      data);
 424         }
 425
 426         talloc_free(res);
 427
 428         return WERR_OK;
 429 }
 430
 431 static WERROR ldb_get_value_by_id(TALLOC_CTX *mem_ctx, struct hive_key *k,
 432                                   uint32_t idx, const char **name,
 433                                   uint32_t *data_type, DATA_BLOB *data)
 434 {
 435         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 436
 437         /* if the default value exists, give it back */
 438         if (W_ERROR_IS_OK(ldb_get_default_value(mem_ctx, k, name, data_type,
 439                 data))) {
 440                 if (idx == 0)
 441                         return WERR_OK;
 442                 else
 443                         --idx;
 444         }
 445
 446         /* Do the search if necessary */
 447         if (kd->values == NULL) {
 448                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 449         }
 450
 451         if (idx >= kd->value_count)
 452                 return WERR_NO_MORE_ITEMS;
 453
 454         reg_ldb_unpack_value(mem_ctx, kd->values[idx], name, data_type, data);
 455
 456         return WERR_OK;
 457 }
 458
 459 static WERROR ldb_get_value(TALLOC_CTX *mem_ctx, struct hive_key *k,
 460                             const char *name, uint32_t *data_type,
 461                             DATA_BLOB *data)
 462 {
 463         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 464         const char *res_name;
 465         uint32_t idx;
 466
 467         if (name == NULL) {
 468                 return WERR_INVALID_PARAM;
 469         }
 470
 471         /* the default value was requested, give it back */
 472         if (name[0] == '\0') {
 473                 return ldb_get_default_value(mem_ctx, k, NULL, data_type, data);
 474         }
 475
 476         /* Do the search if necessary */
 477         if (kd->values == NULL) {
 478                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 479         }
 480
 481         for (idx = 0; idx < kd->value_count; idx++) {
 482                 res_name = ldb_msg_find_attr_as_string(kd->values[idx], "value",
 483                                                        "");
 484                 if (ldb_attr_cmp(name, res_name) == 0) {
 485                         reg_ldb_unpack_value(mem_ctx, kd->values[idx], NULL,
 486                                              data_type, data);
 487                         return WERR_OK;
 488                 }
 489         }
 490
 491         return WERR_BADFILE;
 492 }
 493
 494 static WERROR ldb_open_key(TALLOC_CTX *mem_ctx, const struct hive_key *h,
 495                            const char *name, struct hive_key **key)
 496 {
 497         struct ldb_result *res;
 498         struct ldb_dn *ldap_path;
 499         int ret;
 500         struct ldb_key_data *newkd;
 501         struct ldb_key_data *kd = talloc_get_type(h, struct ldb_key_data);
 502         struct ldb_context *c = kd->ldb;
 503
 504         if (name == NULL) {
 505                 return WERR_INVALID_PARAM;
 506         }
 507
 508         ldap_path = reg_path_to_ldb(mem_ctx, h, name, NULL);
 509         W_ERROR_HAVE_NO_MEMORY(ldap_path);
 510
 511         ret = ldb_search(c, mem_ctx, &res, ldap_path, LDB_SCOPE_BASE, NULL, "(key=*)");
 512
 513         if (ret != LDB_SUCCESS) {
 514                 DEBUG(3, ("Error opening key '%s': %s\n",
 515                         ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 516                 return WERR_FOOBAR;
 517         } else if (res->count == 0) {
 518                 DEBUG(3, ("Key '%s' not found\n",
 519                         ldb_dn_get_linearized(ldap_path)));
 520                 talloc_free(res);
 521                 return WERR_BADFILE;
 522         }
 523
 524         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 525         newkd->key.ops = &reg_backend_ldb;
 526         newkd->ldb = talloc_reference(newkd, kd->ldb);
 527         newkd->dn = ldb_dn_copy(mem_ctx, res->msgs[0]->dn);
 528         newkd->classname = talloc_steal(newkd,
 529                                         ldb_msg_find_attr_as_string(res->msgs[0], "classname", NULL);
 530
 531         *key = (struct hive_key *)newkd;
 532
 533         return WERR_OK;
 534 }
 535
 536 WERROR reg_open_ldb_file(TALLOC_CTX *parent_ctx, const char *location,
 537                          struct auth_session_info *session_info,
 538                          struct cli_credentials *credentials,
 539                          struct tevent_context *ev_ctx,
 540                          struct loadparm_context *lp_ctx,
 541                          struct hive_key **k)
 542 {
 543         struct ldb_key_data *kd;
 544         struct ldb_context *wrap;
 545         struct ldb_message *attrs_msg;
 546
 547         if (location == NULL)
 548                 return WERR_INVALID_PARAM;
 549
 550         wrap = ldb_wrap_connect(parent_ctx, ev_ctx, lp_ctx,
 551                                 location, session_info, credentials, 0);
 552
 553         if (wrap == NULL) {
 554                 DEBUG(1, (__FILE__": unable to connect\n"));
 555                 return WERR_FOOBAR;
 556         }
 557
 558         attrs_msg = ldb_msg_new(wrap);
 559         W_ERROR_HAVE_NO_MEMORY(attrs_msg);
 560         attrs_msg->dn = ldb_dn_new(attrs_msg, wrap, "@ATTRIBUTES");
 561         W_ERROR_HAVE_NO_MEMORY(attrs_msg->dn);
 562         ldb_msg_add_string(attrs_msg, "key", "CASE_INSENSITIVE");
 563         ldb_msg_add_string(attrs_msg, "value", "CASE_INSENSITIVE");
 564
 565         ldb_add(wrap, attrs_msg);
 566
 567         ldb_set_debug_stderr(wrap);
 568
 569         kd = talloc_zero(parent_ctx, struct ldb_key_data);
 570         kd->key.ops = &reg_backend_ldb;
 571         kd->ldb = talloc_reference(kd, wrap);
 572         talloc_set_destructor (kd, reg_close_ldb_key);
 573         kd->dn = ldb_dn_new(kd, wrap, "hive=NONE");
 574
 575         *k = (struct hive_key *)kd;
 576
 577         return WERR_OK;
 578 }
 579
 580 static WERROR ldb_add_key(TALLOC_CTX *mem_ctx, const struct hive_key *parent,
 581                           const char *name, const char *classname,
 582                           struct security_descriptor *sd,
 583                           struct hive_key **newkey)
 584 {
 585         struct ldb_key_data *parentkd = discard_const_p(struct ldb_key_data, parent);
 586         struct ldb_message *msg;
 587         struct ldb_key_data *newkd;
 588         int ret;
 589
 590         if (name == NULL) {
 591                 return WERR_INVALID_PARAM;
 592         }
 593
 594         msg = ldb_msg_new(mem_ctx);
 595         W_ERROR_HAVE_NO_MEMORY(msg);
 596
 597         msg->dn = reg_path_to_ldb(msg, parent, name, NULL);
 598         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 599
 600         ldb_msg_add_string(msg, "key", talloc_strdup(mem_ctx, name));
 601         if (classname != NULL)
 602                 ldb_msg_add_string(msg, "classname",
 603                                    talloc_strdup(mem_ctx, classname));
 604
 605         ret = ldb_add(parentkd->ldb, msg);
 606         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 607                 return WERR_ALREADY_EXISTS;
 608         }
 609
 610         if (ret != LDB_SUCCESS) {
 611                 DEBUG(1, ("ldb_add: %s\n", ldb_errstring(parentkd->ldb)));
 612                 return WERR_FOOBAR;
 613         }
 614
 615         DEBUG(2, ("key added: %s\n", ldb_dn_get_linearized(msg->dn)));
 616
 617         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 618         W_ERROR_HAVE_NO_MEMORY(newkd);
 619         newkd->ldb = talloc_reference(newkd, parentkd->ldb);
 620         newkd->key.ops = &reg_backend_ldb;
 621         newkd->dn = talloc_steal(newkd, msg->dn);
 622         newkd->classname = talloc_steal(newkd, classname);
 623
 624         *newkey = (struct hive_key *)newkd;
 625
 626         /* reset cache */
 627         talloc_free(parentkd->subkeys);
 628         parentkd->subkeys = NULL;
 629
 630         return WERR_OK;
 631 }
 632
 633 static WERROR ldb_del_value(TALLOC_CTX *mem_ctx, struct hive_key *key,
 634                             const char *child)
 635 {
 636         int ret;
 637         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 638         struct ldb_message *msg;
 639         struct ldb_dn *childdn;
 640
 641         if (child == NULL) {
 642                 return WERR_INVALID_PARAM;
 643         }
 644
 645         if (child[0] == '\0') {
 646                 /* default value */
 647                 msg = talloc_zero(mem_ctx, struct ldb_message);
 648                 W_ERROR_HAVE_NO_MEMORY(msg);
 649                 msg->dn = ldb_dn_copy(msg, kd->dn);
 650                 W_ERROR_HAVE_NO_MEMORY(msg->dn);
 651                 ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 652                 ldb_msg_add_empty(msg, "type", LDB_FLAG_MOD_DELETE, NULL);
 653
 654                 ret = ldb_modify(kd->ldb, msg);
 655                 if (ret != LDB_SUCCESS) {
 656                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 657                         return WERR_FOOBAR;
 658                 }
 659         } else {
 660                 /* normal value */
 661                 childdn = ldb_dn_copy(kd->ldb, kd->dn);
 662                 if (!ldb_dn_add_child_fmt(childdn, "value=%s",
 663                                   reg_ldb_escape(childdn, child)))
 664                 {
 665                         talloc_free(childdn);
 666                         return WERR_FOOBAR;
 667                 }
 668
 669                 ret = ldb_delete(kd->ldb, childdn);
 670
 671                 talloc_free(childdn);
 672
 673                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 674                         return WERR_BADFILE;
 675                 } else if (ret != LDB_SUCCESS) {
 676                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 677                         return WERR_FOOBAR;
 678                 }
 679         }
 680
 681         /* reset cache */
 682         talloc_free(kd->values);
 683         kd->values = NULL;
 684
 685         return WERR_OK;
 686 }
 687
 688 static WERROR ldb_del_key(TALLOC_CTX *mem_ctx, const struct hive_key *key,
 689                           const char *name)
 690 {
 691         unsigned int i;
 692         int ret;
 693         struct ldb_key_data *parentkd = talloc_get_type(key, struct ldb_key_data);
 694         struct ldb_dn *ldap_path;
 695         struct ldb_context *c = parentkd->ldb;
 696         struct ldb_result *res_keys;
 697         struct ldb_result *res_vals;
 698         WERROR werr;
 699         struct hive_key *hk;
 700
 701         if (name == NULL) {
 702                 return WERR_INVALID_PARAM;
 703         }
 704
 705         /* Verify key exists by opening it */
 706         werr = ldb_open_key(mem_ctx, key, name, &hk);
 707         if (!W_ERROR_IS_OK(werr)) {
 708                 return werr;
 709         }
 710
 711         ldap_path = reg_path_to_ldb(mem_ctx, key, name, NULL);
 712         W_ERROR_HAVE_NO_MEMORY(ldap_path);
 713
 714         /* Search for subkeys */
 715         ret = ldb_search(c, mem_ctx, &res_keys, ldap_path, LDB_SCOPE_ONELEVEL,
 716                          NULL, "(key=*)");
 717
 718         if (ret != LDB_SUCCESS) {
 719                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 720                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 721                 return WERR_FOOBAR;
 722         }
 723
 724         /* Search for values */
 725         ret = ldb_search(c, mem_ctx, &res_vals, ldap_path, LDB_SCOPE_ONELEVEL,
 726                          NULL, "(value=*)");
 727
 728         if (ret != LDB_SUCCESS) {
 729                 DEBUG(0, ("Error getting values for '%s': %s\n",
 730                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 731                 return WERR_FOOBAR;
 732         }
 733
 734         /* Start an explicit transaction */
 735         ret = ldb_transaction_start(c);
 736
 737         if (ret != LDB_SUCCESS) {
 738                 DEBUG(0, ("ldb_transaction_start: %s\n", ldb_errstring(c)));
 739                 return WERR_FOOBAR;
 740         }
 741
 742         if (res_keys->count || res_vals->count)
 743         {
 744                 /* Delete any subkeys */
 745                 for (i = 0; i < res_keys->count; i++)
 746                 {
 747                         werr = ldb_del_key(mem_ctx, hk,
 748                                            ldb_msg_find_attr_as_string(
 749                                                         res_keys->msgs[i],
 750                                                         "key", NULL));
 751                         if (!W_ERROR_IS_OK(werr)) {
 752                                 ret = ldb_transaction_cancel(c);
 753                                 return werr;
 754                         }
 755                 }
 756
 757                 /* Delete any values */
 758                 for (i = 0; i < res_vals->count; i++)
 759                 {
 760                         werr = ldb_del_value(mem_ctx, hk,
 761                                              ldb_msg_find_attr_as_string(
 762                                                         res_vals->msgs[i],
 763                                                         "value", NULL));
 764                         if (!W_ERROR_IS_OK(werr)) {
 765                                 ret = ldb_transaction_cancel(c);
 766                                 return werr;
 767                         }
 768                 }
 769         }
 770
 771         /* Delete the key itself */
 772         ret = ldb_delete(c, ldap_path);
 773
 774         if (ret != LDB_SUCCESS)
 775         {
 776                 DEBUG(1, ("ldb_del_key: %s\n", ldb_errstring(c)));
 777                 ret = ldb_transaction_cancel(c);
 778                 return WERR_FOOBAR;
 779         }
 780
 781         /* Commit the transaction */
 782         ret = ldb_transaction_commit(c);
 783
 784         if (ret != LDB_SUCCESS)
 785         {
 786                 DEBUG(0, ("ldb_transaction_commit: %s\n", ldb_errstring(c)));
 787                 ret = ldb_transaction_cancel(c);
 788                 return WERR_FOOBAR;
 789         }
 790
 791         /* reset cache */
 792         talloc_free(parentkd->subkeys);
 793         parentkd->subkeys = NULL;
 794
 795         return WERR_OK;
 796 }
 797
 798 static WERROR ldb_set_value(struct hive_key *parent,
 799                             const char *name, uint32_t type,
 800                             const DATA_BLOB data)
 801 {
 802         struct ldb_message *msg;
 803         struct ldb_key_data *kd = talloc_get_type(parent, struct ldb_key_data);
 804         unsigned int i;
 805         int ret;
 806         TALLOC_CTX *mem_ctx = talloc_init("ldb_set_value");
 807
 808         if (name == NULL) {
 809                 return WERR_INVALID_PARAM;
 810         }
 811
 812         msg = reg_ldb_pack_value(kd->ldb, mem_ctx, name, type, data);
 813         W_ERROR_HAVE_NO_MEMORY(msg);
 814
 815         msg->dn = ldb_dn_copy(msg, kd->dn);
 816         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 817
 818         if (name[0] != '\0') {
 819                 /* For a default value, we add/overwrite the attributes to/of the hive.
 820                    For a normal value, we create a new child. */
 821                 if (!ldb_dn_add_child_fmt(msg->dn, "value=%s",
 822                                   reg_ldb_escape(mem_ctx, name)))
 823                 {
 824                         talloc_free(mem_ctx);
 825                         return WERR_FOOBAR;
 826                 }
 827         }
 828
 829         /* Try first a "modify" and if this doesn't work do try an "add" */
 830         for (i = 0; i < msg->num_elements; i++) {
 831                 if (msg->elements[i].flags != LDB_FLAG_MOD_DELETE) {
 832                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 833                 }
 834         }
 835         ret = ldb_modify(kd->ldb, msg);
 836         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 837                 i = 0;
 838                 while (i < msg->num_elements) {
 839                         if (msg->elements[i].flags == LDB_FLAG_MOD_DELETE) {
 840                                 ldb_msg_remove_element(msg, &msg->elements[i]);
 841                         } else {
 842                                 ++i;
 843                         }
 844                 }
 845                 ret = ldb_add(kd->ldb, msg);
 846         }
 847         if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
 848                 /* ignore this -> the value didn't exist and also now doesn't */
 849                 ret = LDB_SUCCESS;
 850         }
 851
 852         if (ret != LDB_SUCCESS) {
 853                 DEBUG(1, ("ldb_set_value: %s\n", ldb_errstring(kd->ldb)));
 854                 talloc_free(mem_ctx);
 855                 return WERR_FOOBAR;
 856         }
 857
 858         /* reset cache */
 859         talloc_free(kd->values);
 860         kd->values = NULL;
 861
 862         talloc_free(mem_ctx);
 863         return WERR_OK;
 864 }
 865
 866 static WERROR ldb_get_key_info(TALLOC_CTX *mem_ctx,
 867                                const struct hive_key *key,
 868                                const char **classname,
 869                                uint32_t *num_subkeys,
 870                                uint32_t *num_values,
 871                                NTTIME *last_change_time,
 872                                uint32_t *max_subkeynamelen,
 873                                uint32_t *max_valnamelen,
 874                                uint32_t *max_valbufsize)
 875 {
 876         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 877         uint32_t default_value_type = REG_NONE;
 878         DATA_BLOB default_value = { NULL, 0 };
 879         WERROR werr;
 880
 881         /* Initialization */
 882         if (classname != NULL)
 883                 *classname = NULL;
 884         if (num_subkeys != NULL)
 885                 *num_subkeys = 0;
 886         if (num_values != NULL)
 887                 *num_values = 0;
 888         if (last_change_time != NULL)
 889                 *last_change_time = 0;
 890         if (max_subkeynamelen != NULL)
 891                 *max_subkeynamelen = 0;
 892         if (max_valnamelen != NULL)
 893                 *max_valnamelen = 0;
 894         if (max_valbufsize != NULL)
 895                 *max_valbufsize = 0;
 896
 897         /* We need this to get the default value (if it exists) for counting
 898          * the values under the key and for finding out the longest value buffer
 899          * size. If no default value exists the DATA_BLOB "default_value" will
 900          * remain { NULL, 0 }. */
 901         werr = ldb_get_default_value(mem_ctx, key, NULL, &default_value_type,
 902                                      &default_value);
 903         if ((!W_ERROR_IS_OK(werr)) && (!W_ERROR_EQUAL(werr, WERR_BADFILE))) {
 904                 return werr;
 905         }
 906
 907         if (kd->subkeys == NULL) {
 908                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 909         }
 910         if (kd->values == NULL) {
 911                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 912         }
 913
 914         if (classname != NULL) {
 915                 *classname = kd->classname;
 916         }
 917
 918         if (num_subkeys != NULL) {
 919                 *num_subkeys = kd->subkey_count;
 920         }
 921         if (num_values != NULL) {
 922                 *num_values = kd->value_count;
 923                 /* also consider the default value if it exists */
 924                 if (default_value.data != NULL) {
 925                         ++(*num_values);
 926                 }
 927         }
 928
 929
 930         if (max_subkeynamelen != NULL) {
 931                 unsigned int i;
 932                 struct ldb_message_element *el;
 933
 934                 for (i = 0; i < kd->subkey_count; i++) {
 935                         el = ldb_msg_find_element(kd->subkeys[i], "key");
 936                         *max_subkeynamelen = MAX(*max_subkeynamelen, el->values[0].length);
 937                 }
 938         }
 939
 940         if (max_valnamelen != NULL || max_valbufsize != NULL) {
 941                 unsigned int i;
 942                 struct ldb_message_element *el;
 943                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 944
 945                 /* also consider the default value if it exists */
 946                 if ((max_valbufsize != NULL) && (default_value.data != NULL)) {
 947                                 *max_valbufsize = MAX(*max_valbufsize,
 948                                                       default_value.length);
 949                 }
 950
 951                 for (i = 0; i < kd->value_count; i++) {
 952                         if (max_valnamelen != NULL) {
 953                                 el = ldb_msg_find_element(kd->values[i], "value");
 954                                 *max_valnamelen = MAX(*max_valnamelen, el->values[0].length);
 955                         }
 956
 957                         if (max_valbufsize != NULL) {
 958                                 uint32_t data_type;
 959                                 DATA_BLOB data;
 960                                 reg_ldb_unpack_value(mem_ctx,
 961                                                      kd->values[i], NULL,
 962                                                      &data_type, &data);
 963                                 *max_valbufsize = MAX(*max_valbufsize, data.length);
 964                                 talloc_free(data.data);
 965                         }
 966                 }
 967         }
 968
 969         talloc_free(default_value.data);
 970
 971         return WERR_OK;
 972 }
 973
 974 static struct hive_operations reg_backend_ldb = {
 975         .name = "ldb",
 976         .add_key = ldb_add_key,
 977         .del_key = ldb_del_key,
 978         .get_key_by_name = ldb_open_key,
 979         .enum_value = ldb_get_value_by_id,
 980         .enum_key = ldb_get_subkey_by_id,
 981         .set_value = ldb_set_value,
 982         .get_value_by_name = ldb_get_value,
 983         .delete_value = ldb_del_value,
 984         .get_key_info = ldb_get_key_info,
 985 };