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 <ldb.h>
  24 #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);
  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                         if (ret2) {
 164                                 ret = ldb_msg_add_value(msg, "data", val, NULL);
 165                         } else {
 166                                 /* workaround for non-standard data */
 167                                 ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 168                         }
 169                 } else {
 170                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 171                 }
 172                 break;
 173
 174         case REG_DWORD:
 175         case REG_DWORD_BIG_ENDIAN:
 176                 if ((data.length > 0) && (data.data != NULL)) {
 177                         if (data.length == sizeof(uint32_t)) {
 178                                 char *conv_str;
 179
 180                                 conv_str = talloc_asprintf(msg, "0x%8.8x",
 181                                                            IVAL(data.data, 0));
 182                                 if (conv_str == NULL) {
 183                                         talloc_free(msg);
 184                                         return NULL;
 185                                 }
 186                                 ret = ldb_msg_add_string(msg, "data", conv_str);
 187                         } else {
 188                                 /* workaround for non-standard data */
 189                                 talloc_free(msg);
 190                                 return NULL;
 191                         }
 192                 } else {
 193                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 194                 }
 195                 break;
 196
 197         case REG_QWORD:
 198                 if ((data.length > 0) && (data.data != NULL)) {
 199                         if (data.length == sizeof(uint64_t)) {
 200                                 char *conv_str;
 201
 202                                 conv_str = talloc_asprintf(msg, "0x%16.16llx",
 203                                                            (unsigned long long)BVAL(data.data, 0));
 204                                 if (conv_str == NULL) {
 205                                         talloc_free(msg);
 206                                         return NULL;
 207                                 }
 208                                 ret = ldb_msg_add_string(msg, "data", conv_str);
 209                         } else {
 210                                 /* workaround for non-standard data */
 211                                 talloc_free(msg);
 212                                 return NULL;
 213
 214                         }
 215                 } else {
 216                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 217                 }
 218                 break;
 219
 220         case REG_BINARY:
 221         default:
 222                 if ((data.length > 0) && (data.data != NULL)) {
 223                         ret = ldb_msg_add_value(msg, "data", &data, NULL);
 224                 } else {
 225                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 226                 }
 227                 break;
 228         }
 229
 230         if (ret != LDB_SUCCESS) {
 231                 talloc_free(msg);
 232                 return NULL;
 233         }
 234
 235         type_str = talloc_asprintf(mem_ctx, "%u", type);
 236         if (type_str == NULL) {
 237                 talloc_free(msg);
 238                 return NULL;
 239         }
 240
 241         ret = ldb_msg_add_string(msg, "type", type_str);
 242         if (ret != LDB_SUCCESS) {
 243                 talloc_free(msg);
 244                 return NULL;
 245         }
 246
 247         return msg;
 248 }
 249
 250 static char *reg_ldb_escape(TALLOC_CTX *mem_ctx, const char *value)
 251 {
 252         struct ldb_val val;
 253
 254         val.data = discard_const_p(uint8_t, value);
 255         val.length = strlen(value);
 256
 257         return ldb_dn_escape_value(mem_ctx, val);
 258 }
 259
 260 static int reg_close_ldb_key(struct ldb_key_data *key)
 261 {
 262         if (key->subkeys != NULL) {
 263                 talloc_free(key->subkeys);
 264                 key->subkeys = NULL;
 265         }
 266
 267         if (key->values != NULL) {
 268                 talloc_free(key->values);
 269                 key->values = NULL;
 270         }
 271         return 0;
 272 }
 273
 274 static struct ldb_dn *reg_path_to_ldb(TALLOC_CTX *mem_ctx,
 275                                       const struct hive_key *from,
 276                                       const char *path, const char *add)
 277 {
 278         struct ldb_dn *ret;
 279         char *mypath;
 280         char *begin;
 281         struct ldb_key_data *kd = talloc_get_type(from, struct ldb_key_data);
 282         struct ldb_context *ldb = kd->ldb;
 283
 284         mypath = talloc_strdup(mem_ctx, path);
 285         if (mypath == NULL) {
 286                 return NULL;
 287         }
 288
 289         ret = ldb_dn_new(mem_ctx, ldb, add);
 290         if (!ldb_dn_validate(ret)) {
 291                 talloc_free(ret);
 292                 return NULL;
 293         }
 294
 295         if (!ldb_dn_add_base(ret, kd->dn)) {
 296                 talloc_free(ret);
 297                 return NULL;
 298         }
 299
 300         while (mypath[0] != '\0') {
 301                 begin = strchr(mypath, '\\');
 302                 if (begin != NULL) {
 303                         *begin = '\0';
 304                 }
 305
 306                 if (!ldb_dn_add_child_fmt(ret, "key=%s",
 307                                           reg_ldb_escape(mem_ctx, mypath))) {
 308                         talloc_free(ret);
 309                         return NULL;
 310                 }
 311
 312                 if (begin != NULL) {
 313                         mypath = begin + 1;
 314                 } else {
 315                         break;
 316                 }
 317         }
 318
 319         return ret;
 320 }
 321
 322 static WERROR cache_subkeys(struct ldb_key_data *kd)
 323 {
 324         struct ldb_context *c = kd->ldb;
 325         struct ldb_result *res;
 326         int ret;
 327
 328         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 329                          NULL, "(key=*)");
 330         if (ret != LDB_SUCCESS) {
 331                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 332                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 333                 return WERR_FOOBAR;
 334         }
 335
 336         kd->subkey_count = res->count;
 337         kd->subkeys = talloc_steal(kd, res->msgs);
 338         talloc_free(res);
 339
 340         return WERR_OK;
 341 }
 342
 343 static WERROR cache_values(struct ldb_key_data *kd)
 344 {
 345         struct ldb_context *c = kd->ldb;
 346         struct ldb_result *res;
 347         int ret;
 348
 349         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 350                          NULL, "(value=*)");
 351         if (ret != LDB_SUCCESS) {
 352                 DEBUG(0, ("Error getting values for '%s': %s\n",
 353                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 354                 return WERR_FOOBAR;
 355         }
 356
 357         kd->value_count = res->count;
 358         kd->values = talloc_steal(kd, res->msgs);
 359         talloc_free(res);
 360
 361         return WERR_OK;
 362 }
 363
 364
 365 static WERROR ldb_get_subkey_by_id(TALLOC_CTX *mem_ctx,
 366                                    const struct hive_key *k, uint32_t idx,
 367                                    const char **name,
 368                                    const char **classname,
 369                                    NTTIME *last_mod_time)
 370 {
 371         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 372
 373         /* Initialization */
 374         if (name != NULL)
 375                 *name = NULL;
 376         if (classname != NULL)
 377                 *classname = NULL;
 378         if (last_mod_time != NULL)
 379                 *last_mod_time = 0; /* TODO: we need to add this to the
 380                                                 ldb backend properly */
 381
 382         /* Do a search if necessary */
 383         if (kd->subkeys == NULL) {
 384                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 385         }
 386
 387         if (idx >= kd->subkey_count)
 388                 return WERR_NO_MORE_ITEMS;
 389
 390         if (name != NULL)
 391                 *name = talloc_strdup(mem_ctx,
 392                                       ldb_msg_find_attr_as_string(kd->subkeys[idx], "key", NULL));
 393         if (classname != NULL)
 394                 *classname = talloc_strdup(mem_ctx,
 395                                            ldb_msg_find_attr_as_string(kd->subkeys[idx], "classname", NULL));
 396
 397         return WERR_OK;
 398 }
 399
 400 static WERROR ldb_get_default_value(TALLOC_CTX *mem_ctx,
 401                                     const struct hive_key *k,
 402                                     const char **name, uint32_t *data_type,
 403                                     DATA_BLOB *data)
 404 {
 405         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 406         struct ldb_context *c = kd->ldb;
 407         const char* attrs[] = { "data", "type", NULL };
 408         struct ldb_result *res;
 409         int ret;
 410
 411         ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_BASE, attrs,
 412                          NULL);
 413
 414         if (ret != LDB_SUCCESS) {
 415                 DEBUG(0, ("Error getting default value for '%s': %s\n",
 416                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 417                 return WERR_FOOBAR;
 418         }
 419
 420         if (res->count == 0 || res->msgs[0]->num_elements == 0) {
 421                 talloc_free(res);
 422                 return WERR_BADFILE;
 423         }
 424
 425         if ((data_type != NULL) && (data != NULL)) {
 426                 reg_ldb_unpack_value(mem_ctx, res->msgs[0], name, data_type,
 427                                      data);
 428         }
 429
 430         talloc_free(res);
 431
 432         return WERR_OK;
 433 }
 434
 435 static WERROR ldb_get_value_by_id(TALLOC_CTX *mem_ctx, struct hive_key *k,
 436                                   uint32_t idx, const char **name,
 437                                   uint32_t *data_type, DATA_BLOB *data)
 438 {
 439         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 440
 441         /* if the default value exists, give it back */
 442         if (W_ERROR_IS_OK(ldb_get_default_value(mem_ctx, k, name, data_type,
 443                 data))) {
 444                 if (idx == 0)
 445                         return WERR_OK;
 446                 else
 447                         --idx;
 448         }
 449
 450         /* Do the search if necessary */
 451         if (kd->values == NULL) {
 452                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 453         }
 454
 455         if (idx >= kd->value_count)
 456                 return WERR_NO_MORE_ITEMS;
 457
 458         reg_ldb_unpack_value(mem_ctx, kd->values[idx], name, data_type, data);
 459
 460         return WERR_OK;
 461 }
 462
 463 static WERROR ldb_get_value(TALLOC_CTX *mem_ctx, struct hive_key *k,
 464                             const char *name, uint32_t *data_type,
 465                             DATA_BLOB *data)
 466 {
 467         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 468         const char *res_name;
 469         uint32_t idx;
 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 *ldb_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         ldb_path = reg_path_to_ldb(mem_ctx, h, name, NULL);
 505         W_ERROR_HAVE_NO_MEMORY(ldb_path);
 506
 507         ret = ldb_search(c, mem_ctx, &res, ldb_path, LDB_SCOPE_BASE, NULL,
 508                          NULL);
 509
 510         if (ret != LDB_SUCCESS) {
 511                 DEBUG(3, ("Error opening key '%s': %s\n",
 512                         ldb_dn_get_linearized(ldb_path), ldb_errstring(c)));
 513                 return WERR_FOOBAR;
 514         } else if (res->count == 0) {
 515                 DEBUG(3, ("Key '%s' not found\n",
 516                         ldb_dn_get_linearized(ldb_path)));
 517                 talloc_free(res);
 518                 return WERR_BADFILE;
 519         }
 520
 521         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 522         W_ERROR_HAVE_NO_MEMORY(newkd);
 523         newkd->key.ops = &reg_backend_ldb;
 524         newkd->ldb = talloc_reference(newkd, kd->ldb);
 525         newkd->dn = ldb_dn_copy(newkd, res->msgs[0]->dn);
 526         newkd->classname = talloc_steal(newkd,
 527                                         ldb_msg_find_attr_as_string(res->msgs[0], "classname", NULL));
 528
 529         talloc_free(res);
 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_dn *ldb_path;
 587         struct ldb_message *msg;
 588         struct ldb_key_data *newkd;
 589         int ret;
 590
 591         ldb_path = reg_path_to_ldb(mem_ctx, parent, name, NULL);
 592         W_ERROR_HAVE_NO_MEMORY(ldb_path);
 593
 594         msg = ldb_msg_new(mem_ctx);
 595         W_ERROR_HAVE_NO_MEMORY(msg);
 596
 597         msg->dn = ldb_path;
 598
 599         ldb_msg_add_string(msg, "key", name);
 600         if (classname != NULL) {
 601                 ldb_msg_add_string(msg, "classname", classname);
 602         }
 603
 604         ret = ldb_add(parentkd->ldb, msg);
 605
 606         talloc_free(msg);
 607
 608         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 609                 return WERR_ALREADY_EXISTS;
 610         }
 611
 612         if (ret != LDB_SUCCESS) {
 613                 DEBUG(1, ("ldb_add: %s\n", ldb_errstring(parentkd->ldb)));
 614                 return WERR_FOOBAR;
 615         }
 616
 617         DEBUG(2, ("key added: %s\n", ldb_dn_get_linearized(ldb_path)));
 618
 619         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 620         W_ERROR_HAVE_NO_MEMORY(newkd);
 621         newkd->ldb = talloc_reference(newkd, parentkd->ldb);
 622         newkd->key.ops = &reg_backend_ldb;
 623         newkd->dn = talloc_steal(newkd, ldb_path);
 624         newkd->classname = talloc_steal(newkd, classname);
 625
 626         *newkey = (struct hive_key *)newkd;
 627
 628         /* reset cache */
 629         talloc_free(parentkd->subkeys);
 630         parentkd->subkeys = NULL;
 631
 632         return WERR_OK;
 633 }
 634
 635 static WERROR ldb_del_value(TALLOC_CTX *mem_ctx, struct hive_key *key,
 636                             const char *child)
 637 {
 638         int ret;
 639         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 640         struct ldb_message *msg;
 641         struct ldb_dn *childdn;
 642
 643         if (child[0] == '\0') {
 644                 /* default value */
 645                 msg = talloc_zero(mem_ctx, struct ldb_message);
 646                 W_ERROR_HAVE_NO_MEMORY(msg);
 647                 msg->dn = ldb_dn_copy(msg, kd->dn);
 648                 W_ERROR_HAVE_NO_MEMORY(msg->dn);
 649                 ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 650                 if (ret != LDB_SUCCESS) {
 651                         return WERR_FOOBAR;
 652                 }
 653                 ldb_msg_add_empty(msg, "type", LDB_FLAG_MOD_DELETE, NULL);
 654                 if (ret != LDB_SUCCESS) {
 655                         return WERR_FOOBAR;
 656                 }
 657
 658                 ret = ldb_modify(kd->ldb, msg);
 659
 660                 talloc_free(msg);
 661
 662                 if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
 663                         return WERR_BADFILE;
 664                 } else if (ret != LDB_SUCCESS) {
 665                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 666                         return WERR_FOOBAR;
 667                 }
 668         } else {
 669                 /* normal value */
 670                 childdn = ldb_dn_copy(kd->ldb, kd->dn);
 671                 if (!ldb_dn_add_child_fmt(childdn, "value=%s",
 672                                   reg_ldb_escape(childdn, child)))
 673                 {
 674                         talloc_free(childdn);
 675                         return WERR_FOOBAR;
 676                 }
 677
 678                 ret = ldb_delete(kd->ldb, childdn);
 679
 680                 talloc_free(childdn);
 681
 682                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 683                         return WERR_BADFILE;
 684                 } else if (ret != LDB_SUCCESS) {
 685                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 686                         return WERR_FOOBAR;
 687                 }
 688         }
 689
 690         /* reset cache */
 691         talloc_free(kd->values);
 692         kd->values = NULL;
 693
 694         return WERR_OK;
 695 }
 696
 697 static WERROR ldb_del_key(TALLOC_CTX *mem_ctx, const struct hive_key *key,
 698                           const char *name)
 699 {
 700         unsigned int i;
 701         int ret;
 702         struct ldb_key_data *parentkd = talloc_get_type(key, struct ldb_key_data);
 703         struct ldb_dn *ldb_path;
 704         struct ldb_context *c = parentkd->ldb;
 705         struct ldb_result *res_keys;
 706         struct ldb_result *res_vals;
 707         WERROR werr;
 708         struct hive_key *hk;
 709
 710         /* Verify key exists by opening it */
 711         werr = ldb_open_key(mem_ctx, key, name, &hk);
 712         if (!W_ERROR_IS_OK(werr)) {
 713                 return werr;
 714         }
 715
 716         ldb_path = reg_path_to_ldb(mem_ctx, key, name, NULL);
 717         W_ERROR_HAVE_NO_MEMORY(ldb_path);
 718
 719         /* Search for subkeys */
 720         ret = ldb_search(c, mem_ctx, &res_keys, ldb_path, LDB_SCOPE_ONELEVEL,
 721                          NULL, "(key=*)");
 722
 723         if (ret != LDB_SUCCESS) {
 724                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 725                       ldb_dn_get_linearized(ldb_path), ldb_errstring(c)));
 726                 return WERR_FOOBAR;
 727         }
 728
 729         /* Search for values */
 730         ret = ldb_search(c, mem_ctx, &res_vals, ldb_path, LDB_SCOPE_ONELEVEL,
 731                          NULL, "(value=*)");
 732
 733         if (ret != LDB_SUCCESS) {
 734                 DEBUG(0, ("Error getting values for '%s': %s\n",
 735                       ldb_dn_get_linearized(ldb_path), ldb_errstring(c)));
 736                 return WERR_FOOBAR;
 737         }
 738
 739         /* Start an explicit transaction */
 740         ret = ldb_transaction_start(c);
 741
 742         if (ret != LDB_SUCCESS) {
 743                 DEBUG(0, ("ldb_transaction_start: %s\n", ldb_errstring(c)));
 744                 return WERR_FOOBAR;
 745         }
 746
 747         if (res_keys->count || res_vals->count)
 748         {
 749                 /* Delete any subkeys */
 750                 for (i = 0; i < res_keys->count; i++)
 751                 {
 752                         werr = ldb_del_key(mem_ctx, hk,
 753                                            ldb_msg_find_attr_as_string(
 754                                                         res_keys->msgs[i],
 755                                                         "key", NULL));
 756                         if (!W_ERROR_IS_OK(werr)) {
 757                                 ret = ldb_transaction_cancel(c);
 758                                 return werr;
 759                         }
 760                 }
 761
 762                 /* Delete any values */
 763                 for (i = 0; i < res_vals->count; i++)
 764                 {
 765                         werr = ldb_del_value(mem_ctx, hk,
 766                                              ldb_msg_find_attr_as_string(
 767                                                         res_vals->msgs[i],
 768                                                         "value", NULL));
 769                         if (!W_ERROR_IS_OK(werr)) {
 770                                 ret = ldb_transaction_cancel(c);
 771                                 return werr;
 772                         }
 773                 }
 774         }
 775         talloc_free(res_keys);
 776         talloc_free(res_vals);
 777
 778         /* Delete the key itself */
 779         ret = ldb_delete(c, ldb_path);
 780
 781         if (ret != LDB_SUCCESS)
 782         {
 783                 DEBUG(1, ("ldb_del_key: %s\n", ldb_errstring(c)));
 784                 ret = ldb_transaction_cancel(c);
 785                 return WERR_FOOBAR;
 786         }
 787
 788         /* Commit the transaction */
 789         ret = ldb_transaction_commit(c);
 790
 791         if (ret != LDB_SUCCESS)
 792         {
 793                 DEBUG(0, ("ldb_transaction_commit: %s\n", ldb_errstring(c)));
 794                 ret = ldb_transaction_cancel(c);
 795                 return WERR_FOOBAR;
 796         }
 797
 798         /* reset cache */
 799         talloc_free(parentkd->subkeys);
 800         parentkd->subkeys = NULL;
 801
 802         return WERR_OK;
 803 }
 804
 805 static WERROR ldb_set_value(struct hive_key *parent,
 806                             const char *name, uint32_t type,
 807                             const DATA_BLOB data)
 808 {
 809         struct ldb_message *msg;
 810         struct ldb_key_data *kd = talloc_get_type(parent, struct ldb_key_data);
 811         unsigned int i;
 812         int ret;
 813         TALLOC_CTX *mem_ctx = talloc_init("ldb_set_value");
 814
 815         msg = reg_ldb_pack_value(kd->ldb, mem_ctx, name, type, data);
 816         W_ERROR_HAVE_NO_MEMORY(msg);
 817
 818         msg->dn = ldb_dn_copy(msg, kd->dn);
 819         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 820
 821         if (name[0] != '\0') {
 822                 /* For a default value, we add/overwrite the attributes to/of the hive.
 823                    For a normal value, we create a new child. */
 824                 if (!ldb_dn_add_child_fmt(msg->dn, "value=%s",
 825                                   reg_ldb_escape(mem_ctx, name)))
 826                 {
 827                         talloc_free(mem_ctx);
 828                         return WERR_FOOBAR;
 829                 }
 830         }
 831
 832         /* Try first a "modify" and if this doesn't work do try an "add" */
 833         for (i = 0; i < msg->num_elements; i++) {
 834                 if (msg->elements[i].flags != LDB_FLAG_MOD_DELETE) {
 835                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 836                 }
 837         }
 838         ret = ldb_modify(kd->ldb, msg);
 839         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 840                 i = 0;
 841                 while (i < msg->num_elements) {
 842                         if (LDB_FLAG_MOD_TYPE(msg->elements[i].flags) == LDB_FLAG_MOD_DELETE) {
 843                                 ldb_msg_remove_element(msg, &msg->elements[i]);
 844                         } else {
 845                                 ++i;
 846                         }
 847                 }
 848                 ret = ldb_add(kd->ldb, msg);
 849         }
 850         if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
 851                 /* ignore this -> the value didn't exist and also now doesn't */
 852                 ret = LDB_SUCCESS;
 853         }
 854
 855         talloc_free(msg);
 856
 857         if (ret != LDB_SUCCESS) {
 858                 DEBUG(1, ("ldb_set_value: %s\n", ldb_errstring(kd->ldb)));
 859                 talloc_free(mem_ctx);
 860                 return WERR_FOOBAR;
 861         }
 862
 863         /* reset cache */
 864         talloc_free(kd->values);
 865         kd->values = NULL;
 866
 867         talloc_free(mem_ctx);
 868         return WERR_OK;
 869 }
 870
 871 static WERROR ldb_get_key_info(TALLOC_CTX *mem_ctx,
 872                                const struct hive_key *key,
 873                                const char **classname,
 874                                uint32_t *num_subkeys,
 875                                uint32_t *num_values,
 876                                NTTIME *last_change_time,
 877                                uint32_t *max_subkeynamelen,
 878                                uint32_t *max_valnamelen,
 879                                uint32_t *max_valbufsize)
 880 {
 881         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 882         uint32_t default_value_type = REG_NONE;
 883         DATA_BLOB default_value = { NULL, 0 };
 884         WERROR werr;
 885
 886         /* Initialization */
 887         if (classname != NULL)
 888                 *classname = NULL;
 889         if (num_subkeys != NULL)
 890                 *num_subkeys = 0;
 891         if (num_values != NULL)
 892                 *num_values = 0;
 893         if (last_change_time != NULL)
 894                 *last_change_time = 0;
 895         if (max_subkeynamelen != NULL)
 896                 *max_subkeynamelen = 0;
 897         if (max_valnamelen != NULL)
 898                 *max_valnamelen = 0;
 899         if (max_valbufsize != NULL)
 900                 *max_valbufsize = 0;
 901
 902         /* We need this to get the default value (if it exists) for counting
 903          * the values under the key and for finding out the longest value buffer
 904          * size. If no default value exists the DATA_BLOB "default_value" will
 905          * remain { NULL, 0 }. */
 906         werr = ldb_get_default_value(mem_ctx, key, NULL, &default_value_type,
 907                                      &default_value);
 908         if ((!W_ERROR_IS_OK(werr)) && (!W_ERROR_EQUAL(werr, WERR_BADFILE))) {
 909                 return werr;
 910         }
 911
 912         if (kd->subkeys == NULL) {
 913                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 914         }
 915         if (kd->values == NULL) {
 916                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 917         }
 918
 919         if (classname != NULL) {
 920                 *classname = kd->classname;
 921         }
 922
 923         if (num_subkeys != NULL) {
 924                 *num_subkeys = kd->subkey_count;
 925         }
 926         if (num_values != NULL) {
 927                 *num_values = kd->value_count;
 928                 /* also consider the default value if it exists */
 929                 if (default_value.data != NULL) {
 930                         ++(*num_values);
 931                 }
 932         }
 933
 934
 935         if (max_subkeynamelen != NULL) {
 936                 unsigned int i;
 937                 struct ldb_message_element *el;
 938
 939                 for (i = 0; i < kd->subkey_count; i++) {
 940                         el = ldb_msg_find_element(kd->subkeys[i], "key");
 941                         *max_subkeynamelen = MAX(*max_subkeynamelen, el->values[0].length);
 942                 }
 943         }
 944
 945         if (max_valnamelen != NULL || max_valbufsize != NULL) {
 946                 unsigned int i;
 947                 struct ldb_message_element *el;
 948                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 949
 950                 /* also consider the default value if it exists */
 951                 if ((max_valbufsize != NULL) && (default_value.data != NULL)) {
 952                                 *max_valbufsize = MAX(*max_valbufsize,
 953                                                       default_value.length);
 954                 }
 955
 956                 for (i = 0; i < kd->value_count; i++) {
 957                         if (max_valnamelen != NULL) {
 958                                 el = ldb_msg_find_element(kd->values[i], "value");
 959                                 *max_valnamelen = MAX(*max_valnamelen, el->values[0].length);
 960                         }
 961
 962                         if (max_valbufsize != NULL) {
 963                                 uint32_t data_type;
 964                                 DATA_BLOB data;
 965                                 reg_ldb_unpack_value(mem_ctx,
 966                                                      kd->values[i], NULL,
 967                                                      &data_type, &data);
 968                                 *max_valbufsize = MAX(*max_valbufsize, data.length);
 969                                 talloc_free(data.data);
 970                         }
 971                 }
 972         }
 973
 974         talloc_free(default_value.data);
 975
 976         return WERR_OK;
 977 }
 978
 979 static struct hive_operations reg_backend_ldb = {
 980         .name = "ldb",
 981         .add_key = ldb_add_key,
 982         .del_key = ldb_del_key,
 983         .get_key_by_name = ldb_open_key,
 984         .enum_value = ldb_get_value_by_id,
 985         .enum_key = ldb_get_subkey_by_id,
 986         .set_value = ldb_set_value,
 987         .get_value_by_name = ldb_get_value,
 988         .delete_value = ldb_del_value,
 989         .get_key_info = ldb_get_key_info,
 990 };