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