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                                       ""));
  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                         if (val->data[0] != '\0') {
  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                                 /* Provide a possibility to store also UTF8
  71                                  * REG_SZ/REG_EXPAND_SZ values. This is done
  72                                  * by adding a '\0' in front of the data */
  73                                 data->data = talloc_size(mem_ctx, val->length - 1);
  74                                 if (data->data != NULL) {
  75                                         memcpy(data->data, val->data + 1,
  76                                                val->length - 1);
  77                                 }
  78                                 data->length = val->length - 1;
  79                         }
  80                 } else {
  81                         data->data = NULL;
  82                         data->length = 0;
  83                 }
  84                 break;
  85
  86         case REG_DWORD:
  87         case REG_DWORD_BIG_ENDIAN:
  88                 if (val != NULL) {
  89                         if (val->data[0] != '\0') {
  90                                 /* The data is a plain DWORD */
  91                                 uint32_t tmp = strtoul((char *)val->data, NULL, 0);
  92                                 data->data = talloc_size(mem_ctx, sizeof(uint32_t));
  93                                 if (data->data != NULL) {
  94                                         SIVAL(data->data, 0, tmp);
  95                                 }
  96                                 data->length = sizeof(uint32_t);
  97                         } else {
  98                                 /* Provide a possibility to store also UTF8
  99                                  * REG_DWORD values. This is done by adding a
 100                                  * '\0' in front of the data */
 101                                 data->data = talloc_size(mem_ctx, val->length - 1);
 102                                 if (data->data != NULL) {
 103                                         memcpy(data->data, val->data + 1,
 104                                                val->length - 1);
 105                                 }
 106                                 data->length = val->length - 1;
 107                         }
 108                 } else {
 109                         data->data = NULL;
 110                         data->length = 0;
 111                 }
 112                 break;
 113
 114         case REG_QWORD:
 115                 if (val != NULL) {
 116                         if (val->data[0] != '\0') {
 117                                 /* The data is a plain QWORD */
 118                                 uint64_t tmp = strtoull((char *)val->data, NULL, 0);
 119                                 data->data = talloc_size(mem_ctx, sizeof(uint64_t));
 120                                 if (data->data != NULL) {
 121                                         SBVAL(data->data, 0, tmp);
 122                                 }
 123                                 data->length = sizeof(uint64_t);
 124                         } else {
 125                                 /* Provide a possibility to store also UTF8
 126                                  * REG_QWORD values. This is done by adding a
 127                                  * '\0' in front of the data */
 128                                 data->data = talloc_size(mem_ctx, val->length - 1);
 129                                 if (data->data != NULL) {
 130                                         memcpy(data->data, val->data + 1,
 131                                                val->length - 1);
 132                                 }
 133                                 data->length = val->length - 1;
 134                         }
 135                 } else {
 136                         data->data = NULL;
 137                         data->length = 0;
 138                 }
 139                 break;
 140
 141         case REG_BINARY:
 142         default:
 143                 if (val != NULL) {
 144                         data->data = talloc_memdup(mem_ctx, val->data,
 145                                                    val->length);
 146                         data->length = val->length;
 147                 } else {
 148                         data->data = NULL;
 149                         data->length = 0;
 150                 }
 151                 break;
 152         }
 153 }
 154
 155 static struct ldb_message *reg_ldb_pack_value(struct ldb_context *ctx,
 156                                               TALLOC_CTX *mem_ctx,
 157                                               const char *name,
 158                                               uint32_t type, DATA_BLOB data)
 159 {
 160         struct ldb_message *msg;
 161         char *name_dup, *type_str;
 162         int ret;
 163
 164         msg = talloc_zero(mem_ctx, struct ldb_message);
 165         if (msg == NULL) {
 166                 return NULL;
 167         }
 168
 169         name_dup = talloc_strdup(msg, name);
 170         if (name_dup == NULL) {
 171                 talloc_free(msg);
 172                 return NULL;
 173         }
 174
 175         ret = ldb_msg_add_string(msg, "value", name_dup);
 176         if (ret != LDB_SUCCESS) {
 177                 talloc_free(msg);
 178                 return NULL;
 179         }
 180
 181         switch (type) {
 182         case REG_SZ:
 183         case REG_EXPAND_SZ:
 184                 if ((data.length > 0) && (data.data != NULL)) {
 185                         struct ldb_val *val;
 186                         bool ret2 = false;
 187
 188                         val = talloc_zero(msg, struct ldb_val);
 189                         if (val == NULL) {
 190                                 talloc_free(msg);
 191                                 return NULL;
 192                         }
 193
 194                         /* Only when the "data.length" is dividable by two try
 195                          * the charset conversion, otherwise stick with the
 196                          * default of the "ret2" variable set to "false" (which
 197                          * means binary storage and no conversion) */
 198                         if (data.length % 2 == 0) {
 199                                 /* The data is provided as UTF16 string */
 200                                 ret2 = convert_string_talloc(mem_ctx, CH_UTF16, CH_UTF8,
 201                                                              (void *)data.data, data.length,
 202                                                              (void **)&val->data, &val->length,
 203                                                              false);
 204                         }
 205                         if (!ret2) {
 206                                 /* Provide a possibility to store also binary
 207                                  * UTF8 REG_SZ/REG_EXPAND_SZ values as fallback
 208                                  * mechanism. This is done by adding a '\0' in
 209                                  * front of the data */
 210                                 val->data = talloc_size(msg, data.length + 1);
 211                                 if (val->data == NULL) {
 212                                         talloc_free(msg);
 213                                         return NULL;
 214                                 }
 215                                 val->data[0] = '\0';
 216                                 memcpy(val->data + 1, data.data, data.length);
 217                                 val->length = data.length + 1;
 218                         }
 219                         ret = ldb_msg_add_value(msg, "data", val, NULL);
 220                 } else {
 221                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 222                 }
 223                 break;
 224
 225         case REG_DWORD:
 226         case REG_DWORD_BIG_ENDIAN:
 227                 if ((data.length > 0) && (data.data != NULL)) {
 228                         if (data.length == sizeof(uint32_t)) {
 229                                 char *conv_str;
 230
 231                                 conv_str = talloc_asprintf(msg, "0x%8.8x",
 232                                                            IVAL(data.data, 0));
 233                                 if (conv_str == NULL) {
 234                                         talloc_free(msg);
 235                                         return NULL;
 236                                 }
 237                                 ret = ldb_msg_add_string(msg, "data", conv_str);
 238                         } else {
 239                                 /* Provide a possibility to store also UTF8
 240                                  * REG_DWORD values. This is done by adding a
 241                                  * '\0' in front of the data */
 242                                 struct ldb_val *val;
 243
 244                                 val = talloc_zero(msg, struct ldb_val);
 245                                 if (val == NULL) {
 246                                         talloc_free(msg);
 247                                         return NULL;
 248                                 }
 249
 250                                 val->data = talloc_size(msg, data.length + 1);
 251                                 if (val->data == NULL) {
 252                                         talloc_free(msg);
 253                                         return NULL;
 254                                 }
 255                                 val->data[0] = '\0';
 256                                 memcpy(val->data + 1, data.data, data.length);
 257                                 val->length = data.length + 1;
 258                                 ret = ldb_msg_add_value(msg, "data", val, NULL);
 259                         }
 260                 } else {
 261                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 262                 }
 263                 break;
 264
 265         case REG_QWORD:
 266                 if ((data.length > 0) && (data.data != NULL)) {
 267                         if (data.length == sizeof(uint64_t)) {
 268                                 char *conv_str;
 269
 270                                 conv_str = talloc_asprintf(msg, "0x%16.16llx", BVAL(data.data, 0));
 271                                 if (conv_str == NULL) {
 272                                         talloc_free(msg);
 273                                         return NULL;
 274                                 }
 275                                 ret = ldb_msg_add_string(msg, "data", conv_str);
 276                         } else {
 277                                 /* Provide a possibility to store also UTF8
 278                                  * REG_QWORD values. This is done by adding a
 279                                  * '\0' in front of the data */
 280                                 struct ldb_val *val;
 281
 282                                 val = talloc_zero(msg, struct ldb_val);
 283                                 if (val == NULL) {
 284                                         talloc_free(msg);
 285                                         return NULL;
 286                                 }
 287
 288                                 val->data = talloc_size(msg, data.length + 1);
 289                                 if (val->data == NULL) {
 290                                         talloc_free(msg);
 291                                         return NULL;
 292                                 }
 293                                 val->data[0] = '\0';
 294                                 memcpy(val->data + 1, data.data, data.length);
 295                                 val->length = data.length + 1;
 296                                 ret = ldb_msg_add_value(msg, "data", val, NULL);
 297                         }
 298                 } else {
 299                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 300                 }
 301                 break;
 302
 303         case REG_BINARY:
 304         default:
 305                 if ((data.length > 0) && (data.data != NULL)) {
 306                         ret = ldb_msg_add_value(msg, "data", &data, NULL);
 307                 } else {
 308                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 309                 }
 310                 break;
 311         }
 312
 313         if (ret != LDB_SUCCESS) {
 314                 talloc_free(msg);
 315                 return NULL;
 316         }
 317
 318         type_str = talloc_asprintf(mem_ctx, "%u", type);
 319         if (type_str == NULL) {
 320                 talloc_free(msg);
 321                 return NULL;
 322         }
 323
 324         ret = ldb_msg_add_string(msg, "type", type_str);
 325         if (ret != LDB_SUCCESS) {
 326                 talloc_free(msg);
 327                 return NULL;
 328         }
 329
 330         return msg;
 331 }
 332
 333 static char *reg_ldb_escape(TALLOC_CTX *mem_ctx, const char *value)
 334 {
 335         struct ldb_val val;
 336
 337         val.data = discard_const_p(uint8_t, value);
 338         val.length = strlen(value);
 339
 340         return ldb_dn_escape_value(mem_ctx, val);
 341 }
 342
 343 static int reg_close_ldb_key(struct ldb_key_data *key)
 344 {
 345         if (key->subkeys != NULL) {
 346                 talloc_free(key->subkeys);
 347                 key->subkeys = NULL;
 348         }
 349
 350         if (key->values != NULL) {
 351                 talloc_free(key->values);
 352                 key->values = NULL;
 353         }
 354         return 0;
 355 }
 356
 357 static struct ldb_dn *reg_path_to_ldb(TALLOC_CTX *mem_ctx,
 358                                       const struct hive_key *from,
 359                                       const char *path, const char *add)
 360 {
 361         TALLOC_CTX *local_ctx;
 362         struct ldb_dn *ret;
 363         char *mypath = talloc_strdup(mem_ctx, path);
 364         char *begin;
 365         struct ldb_key_data *kd = talloc_get_type(from, struct ldb_key_data);
 366         struct ldb_context *ldb = kd->ldb;
 367
 368         local_ctx = talloc_new(mem_ctx);
 369
 370         ret = ldb_dn_new(mem_ctx, ldb, add);
 371         if (!ldb_dn_validate(ret)) {
 372                 talloc_free(ret);
 373                 talloc_free(local_ctx);
 374                 return NULL;
 375         }
 376
 377         while (mypath) {
 378                 char *keyname;
 379
 380                 begin = strrchr(mypath, '\\');
 381
 382                 if (begin) keyname = begin + 1;
 383                 else keyname = mypath;
 384
 385                 if (keyname[0] != '\0') {
 386                         if (!ldb_dn_add_base_fmt(ret, "key=%s",
 387                                                  reg_ldb_escape(local_ctx,
 388                                                                 keyname)))
 389                         {
 390                                 talloc_free(local_ctx);
 391                                 return NULL;
 392                         }
 393                 }
 394
 395                 if(begin) {
 396                         *begin = '\0';
 397                 } else {
 398                         break;
 399                 }
 400         }
 401
 402         ldb_dn_add_base(ret, kd->dn);
 403
 404         talloc_free(local_ctx);
 405
 406         return ret;
 407 }
 408
 409 static WERROR cache_subkeys(struct ldb_key_data *kd)
 410 {
 411         struct ldb_context *c = kd->ldb;
 412         struct ldb_result *res;
 413         int ret;
 414
 415         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL, NULL, "(key=*)");
 416
 417         if (ret != LDB_SUCCESS) {
 418                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 419                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 420                 return WERR_FOOBAR;
 421         }
 422
 423         kd->subkey_count = res->count;
 424         kd->subkeys = talloc_steal(kd, res->msgs);
 425         talloc_free(res);
 426
 427         return WERR_OK;
 428 }
 429
 430 static WERROR cache_values(struct ldb_key_data *kd)
 431 {
 432         struct ldb_context *c = kd->ldb;
 433         struct ldb_result *res;
 434         int ret;
 435
 436         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 437                          NULL, "(value=*)");
 438
 439         if (ret != LDB_SUCCESS) {
 440                 DEBUG(0, ("Error getting values for '%s': %s\n",
 441                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 442                 return WERR_FOOBAR;
 443         }
 444
 445         kd->value_count = res->count;
 446         kd->values = talloc_steal(kd, res->msgs);
 447         talloc_free(res);
 448
 449         return WERR_OK;
 450 }
 451
 452
 453 static WERROR ldb_get_subkey_by_id(TALLOC_CTX *mem_ctx,
 454                                    const struct hive_key *k, uint32_t idx,
 455                                    const char **name,
 456                                    const char **classname,
 457                                    NTTIME *last_mod_time)
 458 {
 459         struct ldb_message_element *el;
 460         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 461
 462         /* Initialization */
 463         if (name != NULL)
 464                 *name = NULL;
 465         if (classname != NULL)
 466                 *classname = NULL; /* TODO: Store properly */
 467         if (last_mod_time != NULL)
 468                 *last_mod_time = 0; /* TODO: we need to add this to the
 469                                                 ldb backend properly */
 470
 471         /* Do a search if necessary */
 472         if (kd->subkeys == NULL) {
 473                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 474         }
 475
 476         if (idx >= kd->subkey_count)
 477                 return WERR_NO_MORE_ITEMS;
 478
 479         el = ldb_msg_find_element(kd->subkeys[idx], "key");
 480         SMB_ASSERT(el != NULL);
 481         SMB_ASSERT(el->num_values != 0);
 482
 483         if (name != NULL)
 484                 *name = talloc_strdup(mem_ctx, (char *)el->values[0].data);
 485
 486         return WERR_OK;
 487 }
 488
 489 static WERROR ldb_get_default_value(TALLOC_CTX *mem_ctx,
 490                                     const struct hive_key *k,
 491                                     const char **name, uint32_t *data_type,
 492                                     DATA_BLOB *data)
 493 {
 494         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 495         struct ldb_context *c = kd->ldb;
 496         const char* attrs[] = { "data", "type", NULL };
 497         struct ldb_result *res;
 498         int ret;
 499
 500         ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_BASE, attrs, "(dn=*)");
 501
 502         if (ret != LDB_SUCCESS) {
 503                 DEBUG(0, ("Error getting default value for '%s': %s\n",
 504                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 505                 return WERR_FOOBAR;
 506         }
 507
 508         if (res->count == 0 || res->msgs[0]->num_elements == 0)
 509                 return WERR_BADFILE;
 510
 511         if ((data_type != NULL) && (data != NULL)) {
 512                 reg_ldb_unpack_value(mem_ctx, res->msgs[0], name, data_type,
 513                                      data);
 514         }
 515
 516         talloc_free(res);
 517
 518         return WERR_OK;
 519 }
 520
 521 static WERROR ldb_get_value_by_id(TALLOC_CTX *mem_ctx, struct hive_key *k,
 522                                   uint32_t idx, const char **name,
 523                                   uint32_t *data_type, DATA_BLOB *data)
 524 {
 525         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 526
 527         /* if default value exists, give it back */
 528         if (W_ERROR_IS_OK(ldb_get_default_value(mem_ctx, k, name, data_type,
 529                 data))) {
 530                 if (idx == 0)
 531                         return WERR_OK;
 532                 else
 533                         --idx;
 534         }
 535
 536         /* Do the search if necessary */
 537         if (kd->values == NULL) {
 538                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 539         }
 540
 541         if (idx >= kd->value_count)
 542                 return WERR_NO_MORE_ITEMS;
 543
 544         reg_ldb_unpack_value(mem_ctx, kd->values[idx], name, data_type, data);
 545
 546         return WERR_OK;
 547 }
 548
 549 static WERROR ldb_get_value(TALLOC_CTX *mem_ctx, struct hive_key *k,
 550                             const char *name, uint32_t *data_type,
 551                             DATA_BLOB *data)
 552 {
 553         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 554         struct ldb_context *c = kd->ldb;
 555         struct ldb_result *res;
 556         int ret;
 557
 558         if (name == NULL) {
 559                 return WERR_INVALID_PARAM;
 560         }
 561
 562         if (name[0] == '\0') {
 563                 /* default value */
 564                 return ldb_get_default_value(mem_ctx, k, NULL, data_type, data);
 565         } else {
 566                 /* normal value */
 567                 ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 568                                  NULL, "(value=%s)", name);
 569
 570                 if (ret != LDB_SUCCESS) {
 571                         DEBUG(0, ("Error getting values for '%s': %s\n",
 572                                 ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 573                         return WERR_FOOBAR;
 574                 }
 575
 576                 if (res->count == 0)
 577                         return WERR_BADFILE;
 578
 579                 reg_ldb_unpack_value(mem_ctx, res->msgs[0], NULL, data_type, data);
 580
 581                 talloc_free(res);
 582         }
 583
 584         return WERR_OK;
 585 }
 586
 587 static WERROR ldb_open_key(TALLOC_CTX *mem_ctx, const struct hive_key *h,
 588                            const char *name, struct hive_key **key)
 589 {
 590         struct ldb_result *res;
 591         struct ldb_dn *ldap_path;
 592         int ret;
 593         struct ldb_key_data *newkd;
 594         struct ldb_key_data *kd = talloc_get_type(h, struct ldb_key_data);
 595         struct ldb_context *c = kd->ldb;
 596
 597         ldap_path = reg_path_to_ldb(mem_ctx, h, name, NULL);
 598         W_ERROR_HAVE_NO_MEMORY(ldap_path);
 599
 600         ret = ldb_search(c, mem_ctx, &res, ldap_path, LDB_SCOPE_BASE, NULL, "(key=*)");
 601
 602         if (ret != LDB_SUCCESS) {
 603                 DEBUG(3, ("Error opening key '%s': %s\n",
 604                         ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 605                 return WERR_FOOBAR;
 606         } else if (res->count == 0) {
 607                 DEBUG(3, ("Key '%s' not found\n",
 608                         ldb_dn_get_linearized(ldap_path)));
 609                 talloc_free(res);
 610                 return WERR_BADFILE;
 611         }
 612
 613         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 614         newkd->key.ops = &reg_backend_ldb;
 615         newkd->ldb = talloc_reference(newkd, kd->ldb);
 616         newkd->dn = ldb_dn_copy(mem_ctx, res->msgs[0]->dn);
 617
 618         *key = (struct hive_key *)newkd;
 619
 620         return WERR_OK;
 621 }
 622
 623 WERROR reg_open_ldb_file(TALLOC_CTX *parent_ctx, const char *location,
 624                          struct auth_session_info *session_info,
 625                          struct cli_credentials *credentials,
 626                          struct tevent_context *ev_ctx,
 627                          struct loadparm_context *lp_ctx,
 628                          struct hive_key **k)
 629 {
 630         struct ldb_key_data *kd;
 631         struct ldb_context *wrap;
 632         struct ldb_message *attrs_msg;
 633
 634         if (location == NULL)
 635                 return WERR_INVALID_PARAM;
 636
 637         wrap = ldb_wrap_connect(parent_ctx, ev_ctx, lp_ctx,
 638                                 location, session_info, credentials, 0);
 639
 640         if (wrap == NULL) {
 641                 DEBUG(1, (__FILE__": unable to connect\n"));
 642                 return WERR_FOOBAR;
 643         }
 644
 645         attrs_msg = ldb_msg_new(wrap);
 646         W_ERROR_HAVE_NO_MEMORY(attrs_msg);
 647         attrs_msg->dn = ldb_dn_new(attrs_msg, wrap, "@ATTRIBUTES");
 648         W_ERROR_HAVE_NO_MEMORY(attrs_msg->dn);
 649         ldb_msg_add_string(attrs_msg, "key", "CASE_INSENSITIVE");
 650         ldb_msg_add_string(attrs_msg, "value", "CASE_INSENSITIVE");
 651
 652         ldb_add(wrap, attrs_msg);
 653
 654         ldb_set_debug_stderr(wrap);
 655
 656         kd = talloc_zero(parent_ctx, struct ldb_key_data);
 657         kd->key.ops = &reg_backend_ldb;
 658         kd->ldb = talloc_reference(kd, wrap);
 659         talloc_set_destructor (kd, reg_close_ldb_key);
 660         kd->dn = ldb_dn_new(kd, wrap, "hive=NONE");
 661
 662         *k = (struct hive_key *)kd;
 663
 664         return WERR_OK;
 665 }
 666
 667 static WERROR ldb_add_key(TALLOC_CTX *mem_ctx, const struct hive_key *parent,
 668                           const char *name, const char *classname,
 669                           struct security_descriptor *sd,
 670                           struct hive_key **newkey)
 671 {
 672         struct ldb_key_data *parentkd = discard_const_p(struct ldb_key_data, parent);
 673         struct ldb_message *msg;
 674         struct ldb_key_data *newkd;
 675         int ret;
 676
 677         msg = ldb_msg_new(mem_ctx);
 678         W_ERROR_HAVE_NO_MEMORY(msg);
 679
 680         msg->dn = reg_path_to_ldb(msg, parent, name, NULL);
 681         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 682
 683         ldb_msg_add_string(msg, "key", talloc_strdup(mem_ctx, name));
 684         if (classname != NULL)
 685                 ldb_msg_add_string(msg, "classname",
 686                                    talloc_strdup(mem_ctx, classname));
 687
 688         ret = ldb_add(parentkd->ldb, msg);
 689         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 690                 return WERR_ALREADY_EXISTS;
 691         }
 692
 693         if (ret != LDB_SUCCESS) {
 694                 DEBUG(1, ("ldb_add: %s\n", ldb_errstring(parentkd->ldb)));
 695                 return WERR_FOOBAR;
 696         }
 697
 698         DEBUG(2, ("key added: %s\n", ldb_dn_get_linearized(msg->dn)));
 699
 700         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 701         W_ERROR_HAVE_NO_MEMORY(newkd);
 702         newkd->ldb = talloc_reference(newkd, parentkd->ldb);
 703         newkd->key.ops = &reg_backend_ldb;
 704         newkd->dn = talloc_steal(newkd, msg->dn);
 705
 706         *newkey = (struct hive_key *)newkd;
 707
 708         /* reset cache */
 709         talloc_free(parentkd->subkeys);
 710         parentkd->subkeys = NULL;
 711
 712         return WERR_OK;
 713 }
 714
 715 static WERROR ldb_del_value(TALLOC_CTX *mem_ctx, struct hive_key *key,
 716                             const char *child)
 717 {
 718         int ret;
 719         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 720         struct ldb_message *msg;
 721         struct ldb_dn *childdn;
 722
 723         if ((child == NULL) || (child[0] == '\0')) {
 724                 /* default value */
 725                 msg = talloc_zero(mem_ctx, struct ldb_message);
 726                 W_ERROR_HAVE_NO_MEMORY(msg);
 727                 msg->dn = ldb_dn_copy(msg, kd->dn);
 728                 W_ERROR_HAVE_NO_MEMORY(msg->dn);
 729                 ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 730                 ldb_msg_add_empty(msg, "type", LDB_FLAG_MOD_DELETE, NULL);
 731
 732                 ret = ldb_modify(kd->ldb, msg);
 733                 if (ret != LDB_SUCCESS) {
 734                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 735                         return WERR_FOOBAR;
 736                 }
 737         } else {
 738                 /* normal value */
 739                 childdn = ldb_dn_copy(kd->ldb, kd->dn);
 740                 if (!ldb_dn_add_child_fmt(childdn, "value=%s",
 741                                   reg_ldb_escape(childdn, child)))
 742                 {
 743                         talloc_free(childdn);
 744                         return WERR_FOOBAR;
 745                 }
 746
 747                 ret = ldb_delete(kd->ldb, childdn);
 748
 749                 talloc_free(childdn);
 750
 751                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 752                         return WERR_BADFILE;
 753                 } else if (ret != LDB_SUCCESS) {
 754                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 755                         return WERR_FOOBAR;
 756                 }
 757         }
 758
 759         /* reset cache */
 760         talloc_free(kd->values);
 761         kd->values = NULL;
 762
 763         return WERR_OK;
 764 }
 765
 766 static WERROR ldb_del_key(TALLOC_CTX *mem_ctx, const struct hive_key *key,
 767                           const char *name)
 768 {
 769         unsigned int i;
 770         int ret;
 771         struct ldb_key_data *parentkd = talloc_get_type(key, struct ldb_key_data);
 772         struct ldb_dn *ldap_path;
 773         struct ldb_context *c = parentkd->ldb;
 774         struct ldb_result *res_keys;
 775         struct ldb_result *res_vals;
 776         WERROR werr;
 777         struct hive_key *hk;
 778
 779         /* Verify key exists by opening it */
 780         werr = ldb_open_key(mem_ctx, key, name, &hk);
 781         if (!W_ERROR_IS_OK(werr)) {
 782                 return werr;
 783         }
 784
 785         ldap_path = reg_path_to_ldb(mem_ctx, key, name, NULL);
 786         W_ERROR_HAVE_NO_MEMORY(ldap_path);
 787
 788         /* Search for subkeys */
 789         ret = ldb_search(c, mem_ctx, &res_keys, ldap_path, LDB_SCOPE_ONELEVEL,
 790                          NULL, "(key=*)");
 791
 792         if (ret != LDB_SUCCESS) {
 793                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 794                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 795                 return WERR_FOOBAR;
 796         }
 797
 798         /* Search for values */
 799         ret = ldb_search(c, mem_ctx, &res_vals, ldap_path, LDB_SCOPE_ONELEVEL,
 800                          NULL, "(value=*)");
 801
 802         if (ret != LDB_SUCCESS) {
 803                 DEBUG(0, ("Error getting values for '%s': %s\n",
 804                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 805                 return WERR_FOOBAR;
 806         }
 807
 808         /* Start an explicit transaction */
 809         ret = ldb_transaction_start(c);
 810
 811         if (ret != LDB_SUCCESS) {
 812                 DEBUG(0, ("ldb_transaction_start: %s\n", ldb_errstring(c)));
 813                 return WERR_FOOBAR;
 814         }
 815
 816         if (res_keys->count || res_vals->count)
 817         {
 818                 /* Delete any subkeys */
 819                 for (i = 0; i < res_keys->count; i++)
 820                 {
 821                         werr = ldb_del_key(mem_ctx, hk,
 822                                            ldb_msg_find_attr_as_string(
 823                                                         res_keys->msgs[i],
 824                                                         "key", NULL));
 825                         if (!W_ERROR_IS_OK(werr)) {
 826                                 ret = ldb_transaction_cancel(c);
 827                                 return werr;
 828                         }
 829                 }
 830
 831                 /* Delete any values */
 832                 for (i = 0; i < res_vals->count; i++)
 833                 {
 834                         werr = ldb_del_value(mem_ctx, hk,
 835                                              ldb_msg_find_attr_as_string(
 836                                                         res_vals->msgs[i],
 837                                                         "value", NULL));
 838                         if (!W_ERROR_IS_OK(werr)) {
 839                                 ret = ldb_transaction_cancel(c);
 840                                 return werr;
 841                         }
 842                 }
 843         }
 844
 845         /* Delete the key itself */
 846         ret = ldb_delete(c, ldap_path);
 847
 848         if (ret != LDB_SUCCESS)
 849         {
 850                 DEBUG(1, ("ldb_del_key: %s\n", ldb_errstring(c)));
 851                 ret = ldb_transaction_cancel(c);
 852                 return WERR_FOOBAR;
 853         }
 854
 855         /* Commit the transaction */
 856         ret = ldb_transaction_commit(c);
 857
 858         if (ret != LDB_SUCCESS)
 859         {
 860                 DEBUG(0, ("ldb_transaction_commit: %s\n", ldb_errstring(c)));
 861                 ret = ldb_transaction_cancel(c);
 862                 return WERR_FOOBAR;
 863         }
 864
 865         /* reset cache */
 866         talloc_free(parentkd->subkeys);
 867         parentkd->subkeys = NULL;
 868
 869         return WERR_OK;
 870 }
 871
 872 static WERROR ldb_set_value(struct hive_key *parent,
 873                             const char *name, uint32_t type,
 874                             const DATA_BLOB data)
 875 {
 876         struct ldb_message *msg;
 877         struct ldb_key_data *kd = talloc_get_type(parent, struct ldb_key_data);
 878         unsigned int i;
 879         int ret;
 880         TALLOC_CTX *mem_ctx = talloc_init("ldb_set_value");
 881
 882         msg = reg_ldb_pack_value(kd->ldb, mem_ctx, name, type, data);
 883         W_ERROR_HAVE_NO_MEMORY(msg);
 884
 885         msg->dn = ldb_dn_copy(msg, kd->dn);
 886         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 887
 888         if ((name != NULL) && (name[0] != '\0')) {
 889                 /* For a default value, we add/overwrite the attributes to/of the hive.
 890                    For a normal value, we create a new child. */
 891                 if (!ldb_dn_add_child_fmt(msg->dn, "value=%s",
 892                                   reg_ldb_escape(mem_ctx, name)))
 893                 {
 894                         talloc_free(mem_ctx);
 895                         return WERR_FOOBAR;
 896                 }
 897         }
 898
 899         /* Try first a "modify" and if this doesn't work do try an "add" */
 900         for (i = 0; i < msg->num_elements; i++) {
 901                 if (msg->elements[i].flags != LDB_FLAG_MOD_DELETE) {
 902                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 903                 }
 904         }
 905         ret = ldb_modify(kd->ldb, msg);
 906         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 907                 i = 0;
 908                 while (i < msg->num_elements) {
 909                         if (msg->elements[i].flags == LDB_FLAG_MOD_DELETE) {
 910                                 ldb_msg_remove_element(msg, &msg->elements[i]);
 911                         } else {
 912                                 ++i;
 913                         }
 914                 }
 915                 ret = ldb_add(kd->ldb, msg);
 916         }
 917         if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
 918                 /* ignore this -> the value didn't exist and also now doesn't */
 919                 ret = LDB_SUCCESS;
 920         }
 921
 922         if (ret != LDB_SUCCESS) {
 923                 DEBUG(1, ("ldb_set_value: %s\n", ldb_errstring(kd->ldb)));
 924                 talloc_free(mem_ctx);
 925                 return WERR_FOOBAR;
 926         }
 927
 928         /* reset cache */
 929         talloc_free(kd->values);
 930         kd->values = NULL;
 931
 932         talloc_free(mem_ctx);
 933         return WERR_OK;
 934 }
 935
 936 static WERROR ldb_get_key_info(TALLOC_CTX *mem_ctx,
 937                                const struct hive_key *key,
 938                                const char **classname,
 939                                uint32_t *num_subkeys,
 940                                uint32_t *num_values,
 941                                NTTIME *last_change_time,
 942                                uint32_t *max_subkeynamelen,
 943                                uint32_t *max_valnamelen,
 944                                uint32_t *max_valbufsize)
 945 {
 946         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 947         uint32_t default_value_type = REG_NONE;
 948         DATA_BLOB default_value = { NULL, 0 };
 949         WERROR werr;
 950
 951         /* Initialization */
 952         if (classname != NULL)
 953                 *classname = NULL;
 954         if (num_subkeys != NULL)
 955                 *num_subkeys = 0;
 956         if (num_values != NULL)
 957                 *num_values = 0;
 958         if (last_change_time != NULL)
 959                 *last_change_time = 0;
 960         if (max_subkeynamelen != NULL)
 961                 *max_subkeynamelen = 0;
 962         if (max_valnamelen != NULL)
 963                 *max_valnamelen = 0;
 964         if (max_valbufsize != NULL)
 965                 *max_valbufsize = 0;
 966
 967         /* We need this to get the default value (if it exists) for counting
 968          * the values under the key and for finding out the longest value buffer
 969          * size. If no default value exists the DATA_BLOB "default_value" will
 970          * remain { NULL, 0 }. */
 971         werr = ldb_get_default_value(mem_ctx, key, NULL, &default_value_type,
 972                                      &default_value);
 973         if ((!W_ERROR_IS_OK(werr)) && (!W_ERROR_EQUAL(werr, WERR_BADFILE))) {
 974                 return werr;
 975         }
 976
 977         if (kd->subkeys == NULL) {
 978                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 979         }
 980
 981         if (kd->values == NULL) {
 982                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 983         }
 984
 985         if (num_subkeys != NULL) {
 986                 *num_subkeys = kd->subkey_count;
 987         }
 988         if (num_values != NULL) {
 989                 *num_values = kd->value_count;
 990                 /* also consider the default value if it exists */
 991                 if (default_value.data != NULL) {
 992                         ++(*num_values);
 993                 }
 994         }
 995
 996
 997         if (max_subkeynamelen != NULL) {
 998                 unsigned int i;
 999                 struct ldb_message_element *el;
1000
1001                 for (i = 0; i < kd->subkey_count; i++) {
1002                         el = ldb_msg_find_element(kd->subkeys[i], "key");
1003                         *max_subkeynamelen = MAX(*max_subkeynamelen, el->values[0].length);
1004                 }
1005
1006                 /* for UTF16 encoding */
1007                 *max_subkeynamelen *= 2;
1008         }
1009
1010         if (max_valnamelen != NULL || max_valbufsize != NULL) {
1011                 unsigned int i;
1012                 struct ldb_message_element *el;
1013                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
1014
1015                 /* also consider the default value if it exists */
1016                 if ((max_valbufsize != NULL) && (default_value.data != NULL)) {
1017                                 *max_valbufsize = MAX(*max_valbufsize,
1018                                                       default_value.length);
1019                 }
1020
1021                 for (i = 0; i < kd->value_count; i++) {
1022                         if (max_valnamelen != NULL) {
1023                                 el = ldb_msg_find_element(kd->values[i], "value");
1024                                 *max_valnamelen = MAX(*max_valnamelen, el->values[0].length);
1025                         }
1026
1027                         if (max_valbufsize != NULL) {
1028                                 uint32_t data_type;
1029                                 DATA_BLOB data;
1030                                 reg_ldb_unpack_value(mem_ctx,
1031                                                      kd->values[i], NULL,
1032                                                      &data_type, &data);
1033                                 *max_valbufsize = MAX(*max_valbufsize, data.length);
1034                                 talloc_free(data.data);
1035                         }
1036                 }
1037
1038                 if (max_valnamelen != NULL) {
1039                         /* for UTF16 encoding */
1040                         *max_valnamelen *= 2;
1041                 }
1042         }
1043
1044         talloc_free(default_value.data);
1045
1046         return WERR_OK;
1047 }
1048
1049 static struct hive_operations reg_backend_ldb = {
1050         .name = "ldb",
1051         .add_key = ldb_add_key,
1052         .del_key = ldb_del_key,
1053         .get_key_by_name = ldb_open_key,
1054         .enum_value = ldb_get_value_by_id,
1055         .enum_key = ldb_get_subkey_by_id,
1056         .set_value = ldb_set_value,
1057         .get_value_by_name = ldb_get_value,
1058         .delete_value = ldb_del_value,
1059         .get_key_info = ldb_get_key_info,
1060 };