source4/lib/registry/ldb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Registry interface
   4    Copyright (C) 2004-2007, Jelmer Vernooij, jelmer@samba.org
   5    Copyright (C) 2008-2010, Matthias Dieter Wallnöfer, mdw@samba.org
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "registry.h"
  23 #include "lib/ldb/include/ldb.h"
  24 #include "lib/ldb/include/ldb_errors.h"
  25 #include "ldb_wrap.h"
  26 #include "librpc/gen_ndr/winreg.h"
  27 #include "param/param.h"
  28
  29 static struct hive_operations reg_backend_ldb;
  30
  31 struct ldb_key_data
  32 {
  33         struct hive_key key;
  34         struct ldb_context *ldb;
  35         struct ldb_dn *dn;
  36         struct ldb_message **subkeys, **values;
  37         unsigned int subkey_count, value_count;
  38 };
  39
  40 static void reg_ldb_unpack_value(TALLOC_CTX *mem_ctx,
  41                                  struct ldb_message *msg,
  42                                  const char **name, uint32_t *type,
  43                                  DATA_BLOB *data)
  44 {
  45         const struct ldb_val *val;
  46         uint32_t value_type;
  47
  48         if (name != NULL) {
  49                 *name = talloc_strdup(mem_ctx,
  50                                       ldb_msg_find_attr_as_string(msg, "value",
  51                                       NULL));
  52         }
  53
  54         value_type = ldb_msg_find_attr_as_uint(msg, "type", 0);
  55         *type = value_type;
  56
  57         val = ldb_msg_find_ldb_val(msg, "data");
  58
  59         switch (value_type)
  60         {
  61         case REG_SZ:
  62         case REG_EXPAND_SZ:
  63                 if (val != NULL) {
  64                         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, struct hive_key *k,
 490                                   const char **name, uint32_t *data_type,
 491                                    DATA_BLOB *data)
 492 {
 493         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 494         struct ldb_context *c = kd->ldb;
 495         const char* attrs[] = { "data", "type", NULL };
 496         struct ldb_result *res;
 497         int ret;
 498
 499         ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_BASE, attrs, "(key=*)");
 500
 501         if (ret != LDB_SUCCESS) {
 502                 DEBUG(0, ("Error getting default value for '%s': %s\n",
 503                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 504                 return WERR_FOOBAR;
 505         }
 506
 507         if (res->count == 0 || res->msgs[0]->num_elements == 0)
 508                 return WERR_BADFILE;
 509
 510         reg_ldb_unpack_value(mem_ctx,
 511                  res->msgs[0], name, data_type, data);
 512
 513         talloc_free(res);
 514
 515         return WERR_OK;
 516 }
 517
 518 static WERROR ldb_get_value_by_id(TALLOC_CTX *mem_ctx, struct hive_key *k,
 519                                   uint32_t idx, const char **name,
 520                                   uint32_t *data_type, DATA_BLOB *data)
 521 {
 522         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 523
 524         /* if default value exists, give it back */
 525         if (W_ERROR_IS_OK(ldb_get_default_value(mem_ctx, k, name, data_type,
 526                 data))) {
 527                 if (idx == 0)
 528                         return WERR_OK;
 529                 else
 530                         --idx;
 531         }
 532
 533         /* Do the search if necessary */
 534         if (kd->values == NULL) {
 535                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 536         }
 537
 538         if (idx >= kd->value_count)
 539                 return WERR_NO_MORE_ITEMS;
 540
 541         reg_ldb_unpack_value(mem_ctx, kd->values[idx], name, data_type, data);
 542
 543         return WERR_OK;
 544 }
 545
 546 static WERROR ldb_get_value(TALLOC_CTX *mem_ctx, struct hive_key *k,
 547                             const char *name, uint32_t *data_type,
 548                             DATA_BLOB *data)
 549 {
 550         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 551         struct ldb_context *c = kd->ldb;
 552         struct ldb_result *res;
 553         int ret;
 554
 555         if (name == NULL) {
 556                 return WERR_INVALID_PARAM;
 557         }
 558
 559         if (name[0] == '\0') {
 560                 /* default value */
 561                 return ldb_get_default_value(mem_ctx, k, NULL, data_type, data);
 562         } else {
 563                 /* normal value */
 564                 ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 565                                  NULL, "(value=%s)", name);
 566
 567                 if (ret != LDB_SUCCESS) {
 568                         DEBUG(0, ("Error getting values for '%s': %s\n",
 569                                 ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 570                         return WERR_FOOBAR;
 571                 }
 572
 573                 if (res->count == 0)
 574                         return WERR_BADFILE;
 575
 576                 reg_ldb_unpack_value(mem_ctx, res->msgs[0], NULL, data_type, data);
 577
 578                 talloc_free(res);
 579         }
 580
 581         return WERR_OK;
 582 }
 583
 584 static WERROR ldb_open_key(TALLOC_CTX *mem_ctx, const struct hive_key *h,
 585                            const char *name, struct hive_key **key)
 586 {
 587         struct ldb_result *res;
 588         struct ldb_dn *ldap_path;
 589         int ret;
 590         struct ldb_key_data *newkd;
 591         struct ldb_key_data *kd = talloc_get_type(h, struct ldb_key_data);
 592         struct ldb_context *c = kd->ldb;
 593
 594         ldap_path = reg_path_to_ldb(mem_ctx, h, name, NULL);
 595         W_ERROR_HAVE_NO_MEMORY(ldap_path);
 596
 597         ret = ldb_search(c, mem_ctx, &res, ldap_path, LDB_SCOPE_BASE, NULL, "(key=*)");
 598
 599         if (ret != LDB_SUCCESS) {
 600                 DEBUG(3, ("Error opening key '%s': %s\n",
 601                         ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 602                 return WERR_FOOBAR;
 603         } else if (res->count == 0) {
 604                 DEBUG(3, ("Key '%s' not found\n",
 605                         ldb_dn_get_linearized(ldap_path)));
 606                 talloc_free(res);
 607                 return WERR_BADFILE;
 608         }
 609
 610         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 611         newkd->key.ops = &reg_backend_ldb;
 612         newkd->ldb = talloc_reference(newkd, kd->ldb);
 613         newkd->dn = ldb_dn_copy(mem_ctx, res->msgs[0]->dn);
 614
 615         *key = (struct hive_key *)newkd;
 616
 617         return WERR_OK;
 618 }
 619
 620 WERROR reg_open_ldb_file(TALLOC_CTX *parent_ctx, const char *location,
 621                          struct auth_session_info *session_info,
 622                          struct cli_credentials *credentials,
 623                          struct tevent_context *ev_ctx,
 624                          struct loadparm_context *lp_ctx,
 625                          struct hive_key **k)
 626 {
 627         struct ldb_key_data *kd;
 628         struct ldb_context *wrap;
 629         struct ldb_message *attrs_msg;
 630
 631         if (location == NULL)
 632                 return WERR_INVALID_PARAM;
 633
 634         wrap = ldb_wrap_connect(parent_ctx, ev_ctx, lp_ctx,
 635                                 location, session_info, credentials, 0);
 636
 637         if (wrap == NULL) {
 638                 DEBUG(1, (__FILE__": unable to connect\n"));
 639                 return WERR_FOOBAR;
 640         }
 641
 642         attrs_msg = ldb_msg_new(wrap);
 643         W_ERROR_HAVE_NO_MEMORY(attrs_msg);
 644         attrs_msg->dn = ldb_dn_new(attrs_msg, wrap, "@ATTRIBUTES");
 645         W_ERROR_HAVE_NO_MEMORY(attrs_msg->dn);
 646         ldb_msg_add_string(attrs_msg, "key", "CASE_INSENSITIVE");
 647         ldb_msg_add_string(attrs_msg, "value", "CASE_INSENSITIVE");
 648
 649         ldb_add(wrap, attrs_msg);
 650
 651         ldb_set_debug_stderr(wrap);
 652
 653         kd = talloc_zero(parent_ctx, struct ldb_key_data);
 654         kd->key.ops = &reg_backend_ldb;
 655         kd->ldb = talloc_reference(kd, wrap);
 656         talloc_set_destructor (kd, reg_close_ldb_key);
 657         kd->dn = ldb_dn_new(kd, wrap, "hive=NONE");
 658
 659         *k = (struct hive_key *)kd;
 660
 661         return WERR_OK;
 662 }
 663
 664 static WERROR ldb_add_key(TALLOC_CTX *mem_ctx, const struct hive_key *parent,
 665                           const char *name, const char *classname,
 666                           struct security_descriptor *sd,
 667                           struct hive_key **newkey)
 668 {
 669         struct ldb_key_data *parentkd = discard_const_p(struct ldb_key_data, parent);
 670         struct ldb_message *msg;
 671         struct ldb_key_data *newkd;
 672         int ret;
 673
 674         msg = ldb_msg_new(mem_ctx);
 675         W_ERROR_HAVE_NO_MEMORY(msg);
 676
 677         msg->dn = reg_path_to_ldb(msg, parent, name, NULL);
 678         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 679
 680         ldb_msg_add_string(msg, "key", talloc_strdup(mem_ctx, name));
 681         if (classname != NULL)
 682                 ldb_msg_add_string(msg, "classname",
 683                                    talloc_strdup(mem_ctx, classname));
 684
 685         ret = ldb_add(parentkd->ldb, msg);
 686         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 687                 return WERR_ALREADY_EXISTS;
 688         }
 689
 690         if (ret != LDB_SUCCESS) {
 691                 DEBUG(1, ("ldb_add: %s\n", ldb_errstring(parentkd->ldb)));
 692                 return WERR_FOOBAR;
 693         }
 694
 695         DEBUG(2, ("key added: %s\n", ldb_dn_get_linearized(msg->dn)));
 696
 697         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 698         W_ERROR_HAVE_NO_MEMORY(newkd);
 699         newkd->ldb = talloc_reference(newkd, parentkd->ldb);
 700         newkd->key.ops = &reg_backend_ldb;
 701         newkd->dn = talloc_steal(newkd, msg->dn);
 702
 703         *newkey = (struct hive_key *)newkd;
 704
 705         /* reset cache */
 706         talloc_free(parentkd->subkeys);
 707         parentkd->subkeys = NULL;
 708
 709         return WERR_OK;
 710 }
 711
 712 static WERROR ldb_del_value (struct hive_key *key, const char *child)
 713 {
 714         int ret;
 715         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 716         TALLOC_CTX *mem_ctx;
 717         struct ldb_message *msg;
 718         struct ldb_dn *childdn;
 719
 720         if ((child == NULL) || (child[0] == '\0')) {
 721                 /* default value */
 722                 mem_ctx = talloc_init("ldb_del_value");
 723
 724                 msg = talloc_zero(mem_ctx, struct ldb_message);
 725                 W_ERROR_HAVE_NO_MEMORY(msg);
 726                 msg->dn = ldb_dn_copy(msg, kd->dn);
 727                 W_ERROR_HAVE_NO_MEMORY(msg->dn);
 728                 ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 729                 ldb_msg_add_empty(msg, "type", LDB_FLAG_MOD_DELETE, NULL);
 730
 731                 ret = ldb_modify(kd->ldb, msg);
 732                 if (ret != LDB_SUCCESS) {
 733                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 734                         talloc_free(mem_ctx);
 735                         return WERR_FOOBAR;
 736                 }
 737
 738                 talloc_free(mem_ctx);
 739         } else {
 740                 /* normal value */
 741                 childdn = ldb_dn_copy(kd->ldb, kd->dn);
 742                 if (!ldb_dn_add_child_fmt(childdn, "value=%s",
 743                                   reg_ldb_escape(childdn, child)))
 744                 {
 745                         talloc_free(childdn);
 746                         return WERR_FOOBAR;
 747                 }
 748
 749                 ret = ldb_delete(kd->ldb, childdn);
 750
 751                 talloc_free(childdn);
 752
 753                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 754                         return WERR_BADFILE;
 755                 } else if (ret != LDB_SUCCESS) {
 756                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 757                         return WERR_FOOBAR;
 758                 }
 759         }
 760
 761         /* reset cache */
 762         talloc_free(kd->values);
 763         kd->values = NULL;
 764
 765         return WERR_OK;
 766 }
 767
 768 static WERROR ldb_del_key(const struct hive_key *key, const char *name)
 769 {
 770         unsigned int i;
 771         int ret;
 772         struct ldb_key_data *parentkd = talloc_get_type(key, struct ldb_key_data);
 773         struct ldb_dn *ldap_path;
 774         TALLOC_CTX *mem_ctx = talloc_init("ldb_del_key");
 775         struct ldb_context *c = parentkd->ldb;
 776         struct ldb_result *res_keys;
 777         struct ldb_result *res_vals;
 778         WERROR werr;
 779         struct hive_key *hk;
 780
 781         /* Verify key exists by opening it */
 782         werr = ldb_open_key(mem_ctx, key, name, &hk);
 783         if (!W_ERROR_IS_OK(werr)) {
 784                 talloc_free(mem_ctx);
 785                 return werr;
 786         }
 787
 788         ldap_path = reg_path_to_ldb(mem_ctx, key, name, NULL);
 789         W_ERROR_HAVE_NO_MEMORY(ldap_path);
 790
 791         /* Search for subkeys */
 792         ret = ldb_search(c, mem_ctx, &res_keys, ldap_path, LDB_SCOPE_ONELEVEL,
 793                          NULL, "(key=*)");
 794
 795         if (ret != LDB_SUCCESS) {
 796                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 797                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 798                 talloc_free(mem_ctx);
 799                 return WERR_FOOBAR;
 800         }
 801
 802         /* Search for values */
 803         ret = ldb_search(c, mem_ctx, &res_vals, ldap_path, LDB_SCOPE_ONELEVEL,
 804                          NULL, "(value=*)");
 805
 806         if (ret != LDB_SUCCESS) {
 807                 DEBUG(0, ("Error getting values for '%s': %s\n",
 808                       ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
 809                 talloc_free(mem_ctx);
 810                 return WERR_FOOBAR;
 811         }
 812
 813         /* Start an explicit transaction */
 814         ret = ldb_transaction_start(c);
 815
 816         if (ret != LDB_SUCCESS) {
 817                 DEBUG(0, ("ldb_transaction_start: %s\n", ldb_errstring(c)));
 818                 talloc_free(mem_ctx);
 819                 return WERR_FOOBAR;
 820         }
 821
 822         if (res_keys->count || res_vals->count)
 823         {
 824                 /* Delete any subkeys */
 825                 for (i = 0; i < res_keys->count; i++)
 826                 {
 827                         werr = ldb_del_key(hk, ldb_msg_find_attr_as_string(
 828                                                         res_keys->msgs[i],
 829                                                         "key", NULL));
 830                         if (!W_ERROR_IS_OK(werr)) {
 831                                 ret = ldb_transaction_cancel(c);
 832                                 talloc_free(mem_ctx);
 833                                 return werr;
 834                         }
 835                 }
 836
 837                 /* Delete any values */
 838                 for (i = 0; i < res_vals->count; i++)
 839                 {
 840                         werr = ldb_del_value(hk, ldb_msg_find_attr_as_string(
 841                                                         res_vals->msgs[i],
 842                                                         "value", NULL));
 843                         if (!W_ERROR_IS_OK(werr)) {
 844                                 ret = ldb_transaction_cancel(c);
 845                                 talloc_free(mem_ctx);
 846                                 return werr;
 847                         }
 848                 }
 849         }
 850
 851         /* Delete the key itself */
 852         ret = ldb_delete(c, ldap_path);
 853
 854         if (ret != LDB_SUCCESS)
 855         {
 856                 DEBUG(1, ("ldb_del_key: %s\n", ldb_errstring(c)));
 857                 ret = ldb_transaction_cancel(c);
 858                 talloc_free(mem_ctx);
 859                 return WERR_FOOBAR;
 860         }
 861
 862         /* Commit the transaction */
 863         ret = ldb_transaction_commit(c);
 864
 865         if (ret != LDB_SUCCESS)
 866         {
 867                 DEBUG(0, ("ldb_transaction_commit: %s\n", ldb_errstring(c)));
 868                 ret = ldb_transaction_cancel(c);
 869                 talloc_free(mem_ctx);
 870                 return WERR_FOOBAR;
 871         }
 872
 873         talloc_free(mem_ctx);
 874
 875         /* reset cache */
 876         talloc_free(parentkd->subkeys);
 877         parentkd->subkeys = NULL;
 878
 879         return WERR_OK;
 880 }
 881
 882 static WERROR ldb_set_value(struct hive_key *parent,
 883                             const char *name, uint32_t type,
 884                             const DATA_BLOB data)
 885 {
 886         struct ldb_message *msg;
 887         struct ldb_key_data *kd = talloc_get_type(parent, struct ldb_key_data);
 888         unsigned int i;
 889         int ret;
 890         TALLOC_CTX *mem_ctx = talloc_init("ldb_set_value");
 891
 892         msg = reg_ldb_pack_value(kd->ldb, mem_ctx, name, type, data);
 893         W_ERROR_HAVE_NO_MEMORY(msg);
 894
 895         msg->dn = ldb_dn_copy(msg, kd->dn);
 896         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 897
 898         if ((name != NULL) && (name[0] != '\0')) {
 899                 /* For a default value, we add/overwrite the attributes to/of the hive.
 900                    For a normal value, we create a new child. */
 901                 if (!ldb_dn_add_child_fmt(msg->dn, "value=%s",
 902                                   reg_ldb_escape(mem_ctx, name)))
 903                 {
 904                         talloc_free(mem_ctx);
 905                         return WERR_FOOBAR;
 906                 }
 907         }
 908
 909         /* Try first a "modify" and if this doesn't work do try an "add" */
 910         for (i = 0; i < msg->num_elements; i++) {
 911                 if (msg->elements[i].flags != LDB_FLAG_MOD_DELETE) {
 912                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 913                 }
 914         }
 915         ret = ldb_modify(kd->ldb, msg);
 916         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 917                 i = 0;
 918                 while (i < msg->num_elements) {
 919                         if (msg->elements[i].flags == LDB_FLAG_MOD_DELETE) {
 920                                 ldb_msg_remove_element(msg, &msg->elements[i]);
 921                         } else {
 922                                 ++i;
 923                         }
 924                 }
 925                 ret = ldb_add(kd->ldb, msg);
 926         }
 927         if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
 928                 /* ignore this -> the value didn't exist and also now doesn't */
 929                 ret = LDB_SUCCESS;
 930         }
 931
 932         if (ret != LDB_SUCCESS) {
 933                 DEBUG(1, ("ldb_set_value: %s\n", ldb_errstring(kd->ldb)));
 934                 talloc_free(mem_ctx);
 935                 return WERR_FOOBAR;
 936         }
 937
 938         /* reset cache */
 939         talloc_free(kd->values);
 940         kd->values = NULL;
 941
 942         talloc_free(mem_ctx);
 943         return WERR_OK;
 944 }
 945
 946 static WERROR ldb_get_key_info(TALLOC_CTX *mem_ctx,
 947                                const struct hive_key *key,
 948                                const char **classname,
 949                                uint32_t *num_subkeys,
 950                                uint32_t *num_values,
 951                                NTTIME *last_change_time,
 952                                uint32_t *max_subkeynamelen,
 953                                uint32_t *max_valnamelen,
 954                                uint32_t *max_valbufsize)
 955 {
 956         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 957
 958         /* Initialization */
 959         if (classname != NULL)
 960                 *classname = NULL;
 961         if (num_subkeys != NULL)
 962                 *num_subkeys = 0;
 963         if (num_values != NULL)
 964                 *num_values = 0;
 965         if (last_change_time != NULL)
 966                 *last_change_time = 0;
 967         if (max_subkeynamelen != NULL)
 968                 *max_subkeynamelen = 0;
 969         if (max_valnamelen != NULL)
 970                 *max_valnamelen = 0;
 971         if (max_valbufsize != NULL)
 972                 *max_valbufsize = 0;
 973
 974         if (kd->subkeys == NULL) {
 975                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 976         }
 977
 978         if (kd->values == NULL) {
 979                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 980         }
 981
 982         if (num_subkeys != NULL) {
 983                 *num_subkeys = kd->subkey_count;
 984         }
 985         if (num_values != NULL) {
 986                 *num_values = kd->value_count;
 987         }
 988
 989
 990         if (max_subkeynamelen != NULL) {
 991                 unsigned int i;
 992                 struct ldb_message_element *el;
 993
 994                 for (i = 0; i < kd->subkey_count; i++) {
 995                         el = ldb_msg_find_element(kd->subkeys[i], "key");
 996                         *max_subkeynamelen = MAX(*max_subkeynamelen, el->values[0].length);
 997                 }
 998
 999                 /* for UTF16 encoding */
1000                 *max_subkeynamelen *= 2;
1001         }
1002
1003         if (max_valnamelen != NULL || max_valbufsize != NULL) {
1004                 unsigned int i;
1005                 struct ldb_message_element *el;
1006                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
1007
1008                 for (i = 0; i < kd->value_count; i++) {
1009                         if (max_valnamelen != NULL) {
1010                                 el = ldb_msg_find_element(kd->values[i], "value");
1011                                 *max_valnamelen = MAX(*max_valnamelen, el->values[0].length);
1012                         }
1013
1014                         if (max_valbufsize != NULL) {
1015                                 uint32_t data_type;
1016                                 DATA_BLOB data;
1017                                 reg_ldb_unpack_value(mem_ctx,
1018                                                      kd->values[i], NULL,
1019                                                      &data_type, &data);
1020                                 *max_valbufsize = MAX(*max_valbufsize, data.length);
1021                                 talloc_free(data.data);
1022                         }
1023                 }
1024
1025                 if (max_valnamelen != NULL) {
1026                         /* for UTF16 encoding */
1027                         *max_valnamelen *= 2;
1028                 }
1029         }
1030
1031         return WERR_OK;
1032 }
1033
1034 static struct hive_operations reg_backend_ldb = {
1035         .name = "ldb",
1036         .add_key = ldb_add_key,
1037         .del_key = ldb_del_key,
1038         .get_key_by_name = ldb_open_key,
1039         .enum_value = ldb_get_value_by_id,
1040         .enum_key = ldb_get_subkey_by_id,
1041         .set_value = ldb_set_value,
1042         .get_value_by_name = ldb_get_value,
1043         .delete_value = ldb_del_value,
1044         .get_key_info = ldb_get_key_info,
1045 };