source4/lib/registry/ldb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Registry interface
   4    Copyright (C) 2004-2007, Jelmer Vernooij, jelmer@samba.org
   5    Copyright (C) 2008-2010, Matthias Dieter Wallnöfer, mdw@samba.org
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "registry.h"
  23 #include <ldb.h>
  24 #include <ldb_errors.h>
  25 #include "ldb_wrap.h"
  26 #include "librpc/gen_ndr/winreg.h"
  27 #include "param/param.h"
  28
  29 static struct hive_operations reg_backend_ldb;
  30
  31 struct ldb_key_data
  32 {
  33         struct hive_key key;
  34         struct ldb_context *ldb;
  35         struct ldb_dn *dn;
  36         struct ldb_message **subkeys, **values;
  37         unsigned int subkey_count, value_count;
  38         const char *classname;
  39 };
  40
  41 static void reg_ldb_unpack_value(TALLOC_CTX *mem_ctx,
  42                                  struct ldb_message *msg,
  43                                  const char **name, uint32_t *type,
  44                                  DATA_BLOB *data)
  45 {
  46         const struct ldb_val *val;
  47         uint32_t value_type;
  48
  49         if (name != NULL) {
  50                 *name = talloc_strdup(mem_ctx,
  51                                       ldb_msg_find_attr_as_string(msg, "value",
  52                                       ""));
  53         }
  54
  55         value_type = ldb_msg_find_attr_as_uint(msg, "type", 0);
  56         *type = value_type;
  57
  58         val = ldb_msg_find_ldb_val(msg, "data");
  59
  60         switch (value_type)
  61         {
  62         case REG_SZ:
  63         case REG_EXPAND_SZ:
  64                 if (val != NULL) {
  65                         /* The data should be provided as UTF16 string */
  66                         convert_string_talloc(mem_ctx, CH_UTF8, CH_UTF16,
  67                                               val->data, val->length,
  68                                               (void **)&data->data, &data->length);
  69                 } else {
  70                         data->data = NULL;
  71                         data->length = 0;
  72                 }
  73                 break;
  74
  75         case REG_DWORD:
  76         case REG_DWORD_BIG_ENDIAN:
  77                 if (val != NULL) {
  78                         int error = 0;
  79                         /* The data is a plain DWORD */
  80                         uint32_t tmp;
  81
  82                         tmp = strtoul_err((char *)val->data, NULL, 0, &error);
  83                         if (error != 0) {
  84                                 data->data = NULL;
  85                                 data->length = 0;
  86                                 break;
  87                         }
  88                         data->data = talloc_size(mem_ctx, sizeof(uint32_t));
  89                         if (data->data != NULL) {
  90                                 SIVAL(data->data, 0, tmp);
  91                         }
  92                         data->length = sizeof(uint32_t);
  93                 } else {
  94                         data->data = NULL;
  95                         data->length = 0;
  96                 }
  97                 break;
  98
  99         case REG_QWORD:
 100                 if (val != NULL) {
 101                         int error = 0;
 102                         /* The data is a plain QWORD */
 103                         uint64_t tmp;
 104
 105                         tmp = strtoull_err((char *)val->data, NULL, 0, &error);
 106                         if (error != 0) {
 107                                 data->data = NULL;
 108                                 data->length = 0;
 109                                 break;
 110                         }
 111                         data->data = talloc_size(mem_ctx, sizeof(uint64_t));
 112                         if (data->data != NULL) {
 113                                 SBVAL(data->data, 0, tmp);
 114                         }
 115                         data->length = sizeof(uint64_t);
 116                 } else {
 117                         data->data = NULL;
 118                         data->length = 0;
 119                 }
 120                 break;
 121
 122         case REG_BINARY:
 123         default:
 124                 if (val != NULL) {
 125                         data->data = talloc_memdup(mem_ctx, val->data,
 126                                                    val->length);
 127                         data->length = val->length;
 128                 } else {
 129                         data->data = NULL;
 130                         data->length = 0;
 131                 }
 132                 break;
 133         }
 134 }
 135
 136 static struct ldb_message *reg_ldb_pack_value(struct ldb_context *ctx,
 137                                               TALLOC_CTX *mem_ctx,
 138                                               const char *name,
 139                                               uint32_t type, DATA_BLOB data)
 140 {
 141         struct ldb_message *msg;
 142         char *name_dup, *type_str;
 143         int ret;
 144
 145         msg = ldb_msg_new(mem_ctx);
 146         if (msg == NULL) {
 147                 return NULL;
 148         }
 149
 150         name_dup = talloc_strdup(msg, name);
 151         if (name_dup == NULL) {
 152                 talloc_free(msg);
 153                 return NULL;
 154         }
 155
 156         ret = ldb_msg_add_string(msg, "value", name_dup);
 157         if (ret != LDB_SUCCESS) {
 158                 talloc_free(msg);
 159                 return NULL;
 160         }
 161
 162         switch (type) {
 163         case REG_SZ:
 164         case REG_EXPAND_SZ:
 165                 if ((data.length > 0) && (data.data != NULL)) {
 166                         struct ldb_val *val;
 167                         bool ret2 = false;
 168
 169                         val = talloc_zero(msg, struct ldb_val);
 170                         if (val == NULL) {
 171                                 talloc_free(msg);
 172                                 return NULL;
 173                         }
 174
 175                         /* The data is provided as UTF16 string */
 176                         ret2 = convert_string_talloc(mem_ctx, CH_UTF16, CH_UTF8,
 177                                                      (void *)data.data, data.length,
 178                                                      (void **)&val->data, &val->length);
 179                         if (ret2) {
 180                                 ret = ldb_msg_add_value(msg, "data", val, NULL);
 181                         } else {
 182                                 /* workaround for non-standard data */
 183                                 ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 184                         }
 185                 } else {
 186                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 187                 }
 188                 break;
 189
 190         case REG_DWORD:
 191         case REG_DWORD_BIG_ENDIAN:
 192                 if ((data.length > 0) && (data.data != NULL)) {
 193                         if (data.length == sizeof(uint32_t)) {
 194                                 char *conv_str;
 195
 196                                 conv_str = talloc_asprintf(msg, "0x%8.8x",
 197                                                            IVAL(data.data, 0));
 198                                 if (conv_str == NULL) {
 199                                         talloc_free(msg);
 200                                         return NULL;
 201                                 }
 202                                 ret = ldb_msg_add_string(msg, "data", conv_str);
 203                         } else {
 204                                 /* workaround for non-standard data */
 205                                 talloc_free(msg);
 206                                 return NULL;
 207                         }
 208                 } else {
 209                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 210                 }
 211                 break;
 212
 213         case REG_QWORD:
 214                 if ((data.length > 0) && (data.data != NULL)) {
 215                         if (data.length == sizeof(uint64_t)) {
 216                                 char *conv_str;
 217
 218                                 conv_str = talloc_asprintf(msg, "0x%16.16llx",
 219                                                            (unsigned long long)BVAL(data.data, 0));
 220                                 if (conv_str == NULL) {
 221                                         talloc_free(msg);
 222                                         return NULL;
 223                                 }
 224                                 ret = ldb_msg_add_string(msg, "data", conv_str);
 225                         } else {
 226                                 /* workaround for non-standard data */
 227                                 talloc_free(msg);
 228                                 return NULL;
 229
 230                         }
 231                 } else {
 232                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 233                 }
 234                 break;
 235
 236         case REG_BINARY:
 237         default:
 238                 if ((data.length > 0) && (data.data != NULL)) {
 239                         ret = ldb_msg_add_value(msg, "data", &data, NULL);
 240                 } else {
 241                         ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 242                 }
 243                 break;
 244         }
 245
 246         if (ret != LDB_SUCCESS) {
 247                 talloc_free(msg);
 248                 return NULL;
 249         }
 250
 251         type_str = talloc_asprintf(mem_ctx, "%u", type);
 252         if (type_str == NULL) {
 253                 talloc_free(msg);
 254                 return NULL;
 255         }
 256
 257         ret = ldb_msg_add_string(msg, "type", type_str);
 258         if (ret != LDB_SUCCESS) {
 259                 talloc_free(msg);
 260                 return NULL;
 261         }
 262
 263         return msg;
 264 }
 265
 266 static char *reg_ldb_escape(TALLOC_CTX *mem_ctx, const char *value)
 267 {
 268         struct ldb_val val;
 269
 270         val.data = discard_const_p(uint8_t, value);
 271         val.length = strlen(value);
 272
 273         return ldb_dn_escape_value(mem_ctx, val);
 274 }
 275
 276 static int reg_close_ldb_key(struct ldb_key_data *key)
 277 {
 278         if (key->subkeys != NULL) {
 279                 talloc_free(key->subkeys);
 280                 key->subkeys = NULL;
 281         }
 282
 283         if (key->values != NULL) {
 284                 talloc_free(key->values);
 285                 key->values = NULL;
 286         }
 287         return 0;
 288 }
 289
 290 static struct ldb_dn *reg_path_to_ldb(TALLOC_CTX *mem_ctx,
 291                                       const struct hive_key *from,
 292                                       const char *path, const char *add)
 293 {
 294         struct ldb_dn *ret;
 295         char *mypath;
 296         char *begin;
 297         struct ldb_key_data *kd = talloc_get_type(from, struct ldb_key_data);
 298         struct ldb_context *ldb = kd->ldb;
 299
 300         mypath = talloc_strdup(mem_ctx, path);
 301         if (mypath == NULL) {
 302                 return NULL;
 303         }
 304
 305         ret = ldb_dn_new(mem_ctx, ldb, add);
 306         if (!ldb_dn_validate(ret)) {
 307                 talloc_free(ret);
 308                 return NULL;
 309         }
 310
 311         if (!ldb_dn_add_base(ret, kd->dn)) {
 312                 talloc_free(ret);
 313                 return NULL;
 314         }
 315
 316         while (mypath[0] != '\0') {
 317                 begin = strchr(mypath, '\\');
 318                 if (begin != NULL) {
 319                         *begin = '\0';
 320                 }
 321
 322                 if (!ldb_dn_add_child_fmt(ret, "key=%s",
 323                                           reg_ldb_escape(mem_ctx, mypath))) {
 324                         talloc_free(ret);
 325                         return NULL;
 326                 }
 327
 328                 if (begin != NULL) {
 329                         mypath = begin + 1;
 330                 } else {
 331                         break;
 332                 }
 333         }
 334
 335         return ret;
 336 }
 337
 338 static WERROR cache_subkeys(struct ldb_key_data *kd)
 339 {
 340         struct ldb_context *c = kd->ldb;
 341         struct ldb_result *res;
 342         int ret;
 343
 344         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 345                          NULL, "(key=*)");
 346         if (ret != LDB_SUCCESS) {
 347                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 348                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 349                 return WERR_FOOBAR;
 350         }
 351
 352         kd->subkey_count = res->count;
 353         kd->subkeys = talloc_steal(kd, res->msgs);
 354         talloc_free(res);
 355
 356         return WERR_OK;
 357 }
 358
 359 static WERROR cache_values(struct ldb_key_data *kd)
 360 {
 361         struct ldb_context *c = kd->ldb;
 362         struct ldb_result *res;
 363         int ret;
 364
 365         ret = ldb_search(c, c, &res, kd->dn, LDB_SCOPE_ONELEVEL,
 366                          NULL, "(value=*)");
 367         if (ret != LDB_SUCCESS) {
 368                 DEBUG(0, ("Error getting values for '%s': %s\n",
 369                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 370                 return WERR_FOOBAR;
 371         }
 372
 373         kd->value_count = res->count;
 374         kd->values = talloc_steal(kd, res->msgs);
 375         talloc_free(res);
 376
 377         return WERR_OK;
 378 }
 379
 380
 381 static WERROR ldb_get_subkey_by_id(TALLOC_CTX *mem_ctx,
 382                                    const struct hive_key *k, uint32_t idx,
 383                                    const char **name,
 384                                    const char **classname,
 385                                    NTTIME *last_mod_time)
 386 {
 387         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 388
 389         /* Initialization */
 390         if (name != NULL)
 391                 *name = NULL;
 392         if (classname != NULL)
 393                 *classname = NULL;
 394         if (last_mod_time != NULL)
 395                 *last_mod_time = 0; /* TODO: we need to add this to the
 396                                                 ldb backend properly */
 397
 398         /* Do a search if necessary */
 399         if (kd->subkeys == NULL) {
 400                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 401         }
 402
 403         if (idx >= kd->subkey_count)
 404                 return WERR_NO_MORE_ITEMS;
 405
 406         if (name != NULL)
 407                 *name = talloc_strdup(mem_ctx,
 408                                       ldb_msg_find_attr_as_string(kd->subkeys[idx], "key", NULL));
 409         if (classname != NULL)
 410                 *classname = talloc_strdup(mem_ctx,
 411                                            ldb_msg_find_attr_as_string(kd->subkeys[idx], "classname", NULL));
 412
 413         return WERR_OK;
 414 }
 415
 416 static WERROR ldb_get_default_value(TALLOC_CTX *mem_ctx,
 417                                     const struct hive_key *k,
 418                                     const char **name, uint32_t *data_type,
 419                                     DATA_BLOB *data)
 420 {
 421         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 422         struct ldb_context *c = kd->ldb;
 423         const char* attrs[] = { "data", "type", NULL };
 424         struct ldb_result *res;
 425         int ret;
 426
 427         ret = ldb_search(c, mem_ctx, &res, kd->dn, LDB_SCOPE_BASE, attrs,
 428                          NULL);
 429
 430         if (ret != LDB_SUCCESS) {
 431                 DEBUG(0, ("Error getting default value for '%s': %s\n",
 432                         ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
 433                 return WERR_FOOBAR;
 434         }
 435
 436         if (res->count == 0 || res->msgs[0]->num_elements == 0) {
 437                 talloc_free(res);
 438                 return WERR_FILE_NOT_FOUND;
 439         }
 440
 441         if ((data_type != NULL) && (data != NULL)) {
 442                 reg_ldb_unpack_value(mem_ctx, res->msgs[0], name, data_type,
 443                                      data);
 444         }
 445
 446         talloc_free(res);
 447
 448         return WERR_OK;
 449 }
 450
 451 static WERROR ldb_get_value_by_id(TALLOC_CTX *mem_ctx, struct hive_key *k,
 452                                   uint32_t idx, const char **name,
 453                                   uint32_t *data_type, DATA_BLOB *data)
 454 {
 455         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 456
 457         /* if the default value exists, give it back */
 458         if (W_ERROR_IS_OK(ldb_get_default_value(mem_ctx, k, name, data_type,
 459                 data))) {
 460                 if (idx == 0)
 461                         return WERR_OK;
 462                 else
 463                         --idx;
 464         }
 465
 466         /* Do the search if necessary */
 467         if (kd->values == NULL) {
 468                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 469         }
 470
 471         if (idx >= kd->value_count)
 472                 return WERR_NO_MORE_ITEMS;
 473
 474         reg_ldb_unpack_value(mem_ctx, kd->values[idx], name, data_type, data);
 475
 476         return WERR_OK;
 477 }
 478
 479 static WERROR ldb_get_value(TALLOC_CTX *mem_ctx, struct hive_key *k,
 480                             const char *name, uint32_t *data_type,
 481                             DATA_BLOB *data)
 482 {
 483         struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
 484         const char *res_name;
 485         uint32_t idx;
 486
 487         /* the default value was requested, give it back */
 488         if (name[0] == '\0') {
 489                 return ldb_get_default_value(mem_ctx, k, NULL, data_type, data);
 490         }
 491
 492         /* Do the search if necessary */
 493         if (kd->values == NULL) {
 494                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 495         }
 496
 497         for (idx = 0; idx < kd->value_count; idx++) {
 498                 res_name = ldb_msg_find_attr_as_string(kd->values[idx], "value",
 499                                                        "");
 500                 if (ldb_attr_cmp(name, res_name) == 0) {
 501                         reg_ldb_unpack_value(mem_ctx, kd->values[idx], NULL,
 502                                              data_type, data);
 503                         return WERR_OK;
 504                 }
 505         }
 506
 507         return WERR_FILE_NOT_FOUND;
 508 }
 509
 510 static WERROR ldb_open_key(TALLOC_CTX *mem_ctx, const struct hive_key *h,
 511                            const char *name, struct hive_key **key)
 512 {
 513         struct ldb_result *res;
 514         struct ldb_dn *ldb_path;
 515         int ret;
 516         struct ldb_key_data *newkd;
 517         struct ldb_key_data *kd = talloc_get_type(h, struct ldb_key_data);
 518         struct ldb_context *c = kd->ldb;
 519
 520         ldb_path = reg_path_to_ldb(mem_ctx, h, name, NULL);
 521         W_ERROR_HAVE_NO_MEMORY(ldb_path);
 522
 523         ret = ldb_search(c, mem_ctx, &res, ldb_path, LDB_SCOPE_BASE, NULL,
 524                          NULL);
 525
 526         if (ret != LDB_SUCCESS) {
 527                 DEBUG(3, ("Error opening key '%s': %s\n",
 528                         ldb_dn_get_linearized(ldb_path), ldb_errstring(c)));
 529                 return WERR_FOOBAR;
 530         } else if (res->count == 0) {
 531                 DEBUG(3, ("Key '%s' not found\n",
 532                         ldb_dn_get_linearized(ldb_path)));
 533                 talloc_free(res);
 534                 return WERR_FILE_NOT_FOUND;
 535         }
 536
 537         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 538         W_ERROR_HAVE_NO_MEMORY(newkd);
 539         newkd->key.ops = &reg_backend_ldb;
 540         newkd->ldb = talloc_reference(newkd, kd->ldb);
 541         newkd->dn = ldb_dn_copy(newkd, res->msgs[0]->dn);
 542         newkd->classname = talloc_steal(newkd,
 543                                         ldb_msg_find_attr_as_string(res->msgs[0], "classname", NULL));
 544
 545         talloc_free(res);
 546
 547         *key = (struct hive_key *)newkd;
 548
 549         return WERR_OK;
 550 }
 551
 552 WERROR reg_open_ldb_file(TALLOC_CTX *parent_ctx, const char *location,
 553                          struct auth_session_info *session_info,
 554                          struct cli_credentials *credentials,
 555                          struct tevent_context *ev_ctx,
 556                          struct loadparm_context *lp_ctx,
 557                          struct hive_key **k)
 558 {
 559         struct ldb_key_data *kd;
 560         struct ldb_context *wrap;
 561         struct ldb_message *attrs_msg;
 562
 563         if (location == NULL)
 564                 return WERR_INVALID_PARAMETER;
 565
 566         wrap = ldb_wrap_connect(parent_ctx, ev_ctx, lp_ctx,
 567                                 location, session_info, credentials, 0);
 568
 569         if (wrap == NULL) {
 570                 DEBUG(1, (__FILE__": unable to connect\n"));
 571                 return WERR_FOOBAR;
 572         }
 573
 574         attrs_msg = ldb_msg_new(wrap);
 575         W_ERROR_HAVE_NO_MEMORY(attrs_msg);
 576         attrs_msg->dn = ldb_dn_new(attrs_msg, wrap, "@ATTRIBUTES");
 577         W_ERROR_HAVE_NO_MEMORY(attrs_msg->dn);
 578         ldb_msg_add_string(attrs_msg, "key", "CASE_INSENSITIVE");
 579         ldb_msg_add_string(attrs_msg, "value", "CASE_INSENSITIVE");
 580
 581         ldb_add(wrap, attrs_msg);
 582
 583         ldb_set_debug_stderr(wrap);
 584
 585         kd = talloc_zero(parent_ctx, struct ldb_key_data);
 586         kd->key.ops = &reg_backend_ldb;
 587         kd->ldb = talloc_reference(kd, wrap);
 588         talloc_set_destructor (kd, reg_close_ldb_key);
 589         kd->dn = ldb_dn_new(kd, wrap, "hive=NONE");
 590
 591         *k = (struct hive_key *)kd;
 592
 593         return WERR_OK;
 594 }
 595
 596 static WERROR ldb_add_key(TALLOC_CTX *mem_ctx, const struct hive_key *parent,
 597                           const char *name, const char *classname,
 598                           struct security_descriptor *sd,
 599                           struct hive_key **newkey)
 600 {
 601         struct ldb_key_data *parentkd = discard_const_p(struct ldb_key_data, parent);
 602         struct ldb_dn *ldb_path;
 603         struct ldb_message *msg;
 604         struct ldb_key_data *newkd;
 605         int ret;
 606
 607         ldb_path = reg_path_to_ldb(mem_ctx, parent, name, NULL);
 608         W_ERROR_HAVE_NO_MEMORY(ldb_path);
 609
 610         msg = ldb_msg_new(mem_ctx);
 611         W_ERROR_HAVE_NO_MEMORY(msg);
 612
 613         msg->dn = ldb_path;
 614
 615         ldb_msg_add_string(msg, "key", name);
 616         if (classname != NULL) {
 617                 ldb_msg_add_string(msg, "classname", classname);
 618         }
 619
 620         ret = ldb_add(parentkd->ldb, msg);
 621
 622         talloc_free(msg);
 623
 624         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 625                 return WERR_ALREADY_EXISTS;
 626         }
 627
 628         if (ret != LDB_SUCCESS) {
 629                 DEBUG(1, ("ldb_add: %s\n", ldb_errstring(parentkd->ldb)));
 630                 return WERR_FOOBAR;
 631         }
 632
 633         DEBUG(2, ("key added: %s\n", ldb_dn_get_linearized(ldb_path)));
 634
 635         newkd = talloc_zero(mem_ctx, struct ldb_key_data);
 636         W_ERROR_HAVE_NO_MEMORY(newkd);
 637         newkd->ldb = talloc_reference(newkd, parentkd->ldb);
 638         newkd->key.ops = &reg_backend_ldb;
 639         newkd->dn = talloc_steal(newkd, ldb_path);
 640         newkd->classname = talloc_steal(newkd, classname);
 641
 642         *newkey = (struct hive_key *)newkd;
 643
 644         /* reset cache */
 645         talloc_free(parentkd->subkeys);
 646         parentkd->subkeys = NULL;
 647
 648         return WERR_OK;
 649 }
 650
 651 static WERROR ldb_del_value(TALLOC_CTX *mem_ctx, struct hive_key *key,
 652                             const char *child)
 653 {
 654         int ret;
 655         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 656         struct ldb_message *msg;
 657         struct ldb_dn *childdn;
 658
 659         if (child[0] == '\0') {
 660                 /* default value */
 661                 msg = ldb_msg_new(mem_ctx);
 662                 W_ERROR_HAVE_NO_MEMORY(msg);
 663                 msg->dn = ldb_dn_copy(msg, kd->dn);
 664                 W_ERROR_HAVE_NO_MEMORY(msg->dn);
 665                 ret = ldb_msg_add_empty(msg, "data", LDB_FLAG_MOD_DELETE, NULL);
 666                 if (ret != LDB_SUCCESS) {
 667                         return WERR_FOOBAR;
 668                 }
 669                 ret = ldb_msg_add_empty(msg, "type", LDB_FLAG_MOD_DELETE,
 670                                         NULL);
 671                 if (ret != LDB_SUCCESS) {
 672                         return WERR_FOOBAR;
 673                 }
 674
 675                 ret = ldb_modify(kd->ldb, msg);
 676
 677                 talloc_free(msg);
 678
 679                 if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
 680                         return WERR_FILE_NOT_FOUND;
 681                 } else if (ret != LDB_SUCCESS) {
 682                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 683                         return WERR_FOOBAR;
 684                 }
 685         } else {
 686                 /* normal value */
 687                 childdn = ldb_dn_copy(kd->ldb, kd->dn);
 688                 if (!ldb_dn_add_child_fmt(childdn, "value=%s",
 689                                   reg_ldb_escape(childdn, child)))
 690                 {
 691                         talloc_free(childdn);
 692                         return WERR_FOOBAR;
 693                 }
 694
 695                 ret = ldb_delete(kd->ldb, childdn);
 696
 697                 talloc_free(childdn);
 698
 699                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 700                         return WERR_FILE_NOT_FOUND;
 701                 } else if (ret != LDB_SUCCESS) {
 702                         DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
 703                         return WERR_FOOBAR;
 704                 }
 705         }
 706
 707         /* reset cache */
 708         talloc_free(kd->values);
 709         kd->values = NULL;
 710
 711         return WERR_OK;
 712 }
 713
 714 static WERROR ldb_del_key(TALLOC_CTX *mem_ctx, const struct hive_key *key,
 715                           const char *name)
 716 {
 717         unsigned int i;
 718         int ret;
 719         struct ldb_key_data *parentkd = talloc_get_type(key, struct ldb_key_data);
 720         struct ldb_dn *ldb_path;
 721         struct ldb_context *c = parentkd->ldb;
 722         struct ldb_result *res_keys;
 723         struct ldb_result *res_vals;
 724         WERROR werr;
 725         struct hive_key *hk;
 726
 727         /* Verify key exists by opening it */
 728         werr = ldb_open_key(mem_ctx, key, name, &hk);
 729         if (!W_ERROR_IS_OK(werr)) {
 730                 return werr;
 731         }
 732
 733         ldb_path = reg_path_to_ldb(mem_ctx, key, name, NULL);
 734         W_ERROR_HAVE_NO_MEMORY(ldb_path);
 735
 736         /* Search for subkeys */
 737         ret = ldb_search(c, mem_ctx, &res_keys, ldb_path, LDB_SCOPE_ONELEVEL,
 738                          NULL, "(key=*)");
 739
 740         if (ret != LDB_SUCCESS) {
 741                 DEBUG(0, ("Error getting subkeys for '%s': %s\n",
 742                       ldb_dn_get_linearized(ldb_path), ldb_errstring(c)));
 743                 return WERR_FOOBAR;
 744         }
 745
 746         /* Search for values */
 747         ret = ldb_search(c, mem_ctx, &res_vals, ldb_path, LDB_SCOPE_ONELEVEL,
 748                          NULL, "(value=*)");
 749
 750         if (ret != LDB_SUCCESS) {
 751                 DEBUG(0, ("Error getting values for '%s': %s\n",
 752                       ldb_dn_get_linearized(ldb_path), ldb_errstring(c)));
 753                 return WERR_FOOBAR;
 754         }
 755
 756         /* Start an explicit transaction */
 757         ret = ldb_transaction_start(c);
 758
 759         if (ret != LDB_SUCCESS) {
 760                 DEBUG(0, ("ldb_transaction_start: %s\n", ldb_errstring(c)));
 761                 return WERR_FOOBAR;
 762         }
 763
 764         if (res_keys->count || res_vals->count)
 765         {
 766                 /* Delete any subkeys */
 767                 for (i = 0; i < res_keys->count; i++)
 768                 {
 769                         werr = ldb_del_key(mem_ctx, hk,
 770                                            ldb_msg_find_attr_as_string(
 771                                                         res_keys->msgs[i],
 772                                                         "key", NULL));
 773                         if (!W_ERROR_IS_OK(werr)) {
 774                                 ret = ldb_transaction_cancel(c);
 775                                 return werr;
 776                         }
 777                 }
 778
 779                 /* Delete any values */
 780                 for (i = 0; i < res_vals->count; i++)
 781                 {
 782                         werr = ldb_del_value(mem_ctx, hk,
 783                                              ldb_msg_find_attr_as_string(
 784                                                         res_vals->msgs[i],
 785                                                         "value", NULL));
 786                         if (!W_ERROR_IS_OK(werr)) {
 787                                 ret = ldb_transaction_cancel(c);
 788                                 return werr;
 789                         }
 790                 }
 791         }
 792         talloc_free(res_keys);
 793         talloc_free(res_vals);
 794
 795         /* Delete the key itself */
 796         ret = ldb_delete(c, ldb_path);
 797
 798         if (ret != LDB_SUCCESS)
 799         {
 800                 DEBUG(1, ("ldb_del_key: %s\n", ldb_errstring(c)));
 801                 ret = ldb_transaction_cancel(c);
 802                 return WERR_FOOBAR;
 803         }
 804
 805         /* Commit the transaction */
 806         ret = ldb_transaction_commit(c);
 807
 808         if (ret != LDB_SUCCESS)
 809         {
 810                 DEBUG(0, ("ldb_transaction_commit: %s\n", ldb_errstring(c)));
 811                 ret = ldb_transaction_cancel(c);
 812                 return WERR_FOOBAR;
 813         }
 814
 815         /* reset cache */
 816         talloc_free(parentkd->subkeys);
 817         parentkd->subkeys = NULL;
 818
 819         return WERR_OK;
 820 }
 821
 822 static WERROR ldb_set_value(struct hive_key *parent,
 823                             const char *name, uint32_t type,
 824                             const DATA_BLOB data)
 825 {
 826         struct ldb_message *msg;
 827         struct ldb_key_data *kd = talloc_get_type(parent, struct ldb_key_data);
 828         unsigned int i;
 829         int ret;
 830         TALLOC_CTX *mem_ctx = talloc_init("ldb_set_value");
 831
 832         msg = reg_ldb_pack_value(kd->ldb, mem_ctx, name, type, data);
 833         W_ERROR_HAVE_NO_MEMORY(msg);
 834
 835         msg->dn = ldb_dn_copy(msg, kd->dn);
 836         W_ERROR_HAVE_NO_MEMORY(msg->dn);
 837
 838         if (name[0] != '\0') {
 839                 /* For a default value, we add/overwrite the attributes to/of the hive.
 840                    For a normal value, we create a new child. */
 841                 if (!ldb_dn_add_child_fmt(msg->dn, "value=%s",
 842                                   reg_ldb_escape(mem_ctx, name)))
 843                 {
 844                         talloc_free(mem_ctx);
 845                         return WERR_FOOBAR;
 846                 }
 847         }
 848
 849         /* Try first a "modify" and if this doesn't work do try an "add" */
 850         for (i = 0; i < msg->num_elements; i++) {
 851                 if (msg->elements[i].flags != LDB_FLAG_MOD_DELETE) {
 852                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 853                 }
 854         }
 855         ret = ldb_modify(kd->ldb, msg);
 856         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 857                 i = 0;
 858                 while (i < msg->num_elements) {
 859                         if (LDB_FLAG_MOD_TYPE(msg->elements[i].flags) == LDB_FLAG_MOD_DELETE) {
 860                                 ldb_msg_remove_element(msg, &msg->elements[i]);
 861                         } else {
 862                                 ++i;
 863                         }
 864                 }
 865                 ret = ldb_add(kd->ldb, msg);
 866         }
 867         if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
 868                 /* ignore this -> the value didn't exist and also now doesn't */
 869                 ret = LDB_SUCCESS;
 870         }
 871
 872         talloc_free(msg);
 873
 874         if (ret != LDB_SUCCESS) {
 875                 DEBUG(1, ("ldb_set_value: %s\n", ldb_errstring(kd->ldb)));
 876                 talloc_free(mem_ctx);
 877                 return WERR_FOOBAR;
 878         }
 879
 880         /* reset cache */
 881         talloc_free(kd->values);
 882         kd->values = NULL;
 883
 884         talloc_free(mem_ctx);
 885         return WERR_OK;
 886 }
 887
 888 static WERROR ldb_get_key_info(TALLOC_CTX *mem_ctx,
 889                                const struct hive_key *key,
 890                                const char **classname,
 891                                uint32_t *num_subkeys,
 892                                uint32_t *num_values,
 893                                NTTIME *last_change_time,
 894                                uint32_t *max_subkeynamelen,
 895                                uint32_t *max_valnamelen,
 896                                uint32_t *max_valbufsize)
 897 {
 898         struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
 899         uint32_t default_value_type = REG_NONE;
 900         DATA_BLOB default_value = { NULL, 0 };
 901         WERROR werr;
 902
 903         /* Initialization */
 904         if (classname != NULL)
 905                 *classname = NULL;
 906         if (num_subkeys != NULL)
 907                 *num_subkeys = 0;
 908         if (num_values != NULL)
 909                 *num_values = 0;
 910         if (last_change_time != NULL)
 911                 *last_change_time = 0;
 912         if (max_subkeynamelen != NULL)
 913                 *max_subkeynamelen = 0;
 914         if (max_valnamelen != NULL)
 915                 *max_valnamelen = 0;
 916         if (max_valbufsize != NULL)
 917                 *max_valbufsize = 0;
 918
 919         /* We need this to get the default value (if it exists) for counting
 920          * the values under the key and for finding out the longest value buffer
 921          * size. If no default value exists the DATA_BLOB "default_value" will
 922          * remain { NULL, 0 }. */
 923         werr = ldb_get_default_value(mem_ctx, key, NULL, &default_value_type,
 924                                      &default_value);
 925         if ((!W_ERROR_IS_OK(werr)) && (!W_ERROR_EQUAL(werr, WERR_FILE_NOT_FOUND))) {
 926                 return werr;
 927         }
 928
 929         if (kd->subkeys == NULL) {
 930                 W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
 931         }
 932         if (kd->values == NULL) {
 933                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 934         }
 935
 936         if (classname != NULL) {
 937                 *classname = kd->classname;
 938         }
 939
 940         if (num_subkeys != NULL) {
 941                 *num_subkeys = kd->subkey_count;
 942         }
 943         if (num_values != NULL) {
 944                 *num_values = kd->value_count;
 945                 /* also consider the default value if it exists */
 946                 if (default_value.data != NULL) {
 947                         ++(*num_values);
 948                 }
 949         }
 950
 951
 952         if (max_subkeynamelen != NULL) {
 953                 unsigned int i;
 954                 struct ldb_message_element *el;
 955
 956                 for (i = 0; i < kd->subkey_count; i++) {
 957                         el = ldb_msg_find_element(kd->subkeys[i], "key");
 958                         *max_subkeynamelen = MAX(*max_subkeynamelen, el->values[0].length);
 959                 }
 960         }
 961
 962         if (max_valnamelen != NULL || max_valbufsize != NULL) {
 963                 unsigned int i;
 964                 struct ldb_message_element *el;
 965                 W_ERROR_NOT_OK_RETURN(cache_values(kd));
 966
 967                 /* also consider the default value if it exists */
 968                 if ((max_valbufsize != NULL) && (default_value.data != NULL)) {
 969                                 *max_valbufsize = MAX(*max_valbufsize,
 970                                                       default_value.length);
 971                 }
 972
 973                 for (i = 0; i < kd->value_count; i++) {
 974                         if (max_valnamelen != NULL) {
 975                                 el = ldb_msg_find_element(kd->values[i], "value");
 976                                 *max_valnamelen = MAX(*max_valnamelen, el->values[0].length);
 977                         }
 978
 979                         if (max_valbufsize != NULL) {
 980                                 uint32_t data_type;
 981                                 DATA_BLOB data;
 982                                 reg_ldb_unpack_value(mem_ctx,
 983                                                      kd->values[i], NULL,
 984                                                      &data_type, &data);
 985                                 *max_valbufsize = MAX(*max_valbufsize, data.length);
 986                                 talloc_free(data.data);
 987                         }
 988                 }
 989         }
 990
 991         talloc_free(default_value.data);
 992
 993         return WERR_OK;
 994 }
 995
 996 static struct hive_operations reg_backend_ldb = {
 997         .name = "ldb",
 998         .add_key = ldb_add_key,
 999         .del_key = ldb_del_key,
1000         .get_key_by_name = ldb_open_key,
1001         .enum_value = ldb_get_value_by_id,
1002         .enum_key = ldb_get_subkey_by_id,
1003         .set_value = ldb_set_value,
1004         .get_value_by_name = ldb_get_value,
1005         .delete_value = ldb_del_value,
1006         .get_key_info = ldb_get_key_info,
1007 };