source3/registry/reg_api.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Virtual Windows Registry Layer
   4  *  Copyright (C) Volker Lendecke 2006
   5  *  Copyright (C) Michael Adam 2007-2010
   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 /* Attempt to wrap the existing API in a more winreg.idl-like way */
  22
  23 /*
  24  * Here is a list of winreg.idl functions and corresponding implementations
  25  * provided here:
  26  *
  27  * 0x00         winreg_OpenHKCR
  28  * 0x01         winreg_OpenHKCU
  29  * 0x02         winreg_OpenHKLM
  30  * 0x03         winreg_OpenHKPD
  31  * 0x04         winreg_OpenHKU
  32  * 0x05         winreg_CloseKey
  33  * 0x06         winreg_CreateKey                        reg_createkey
  34  * 0x07         winreg_DeleteKey                        reg_deletekey
  35  * 0x08         winreg_DeleteValue                      reg_deletevalue
  36  * 0x09         winreg_EnumKey                          reg_enumkey
  37  * 0x0a         winreg_EnumValue                        reg_enumvalue
  38  * 0x0b         winreg_FlushKey
  39  * 0x0c         winreg_GetKeySecurity                   reg_getkeysecurity
  40  * 0x0d         winreg_LoadKey
  41  * 0x0e         winreg_NotifyChangeKeyValue
  42  * 0x0f         winreg_OpenKey                          reg_openkey
  43  * 0x10         winreg_QueryInfoKey                     reg_queryinfokey
  44  * 0x11         winreg_QueryValue                       reg_queryvalue
  45  * 0x12         winreg_ReplaceKey
  46  * 0x13         winreg_RestoreKey                       reg_restorekey
  47  * 0x14         winreg_SaveKey                          reg_savekey
  48  * 0x15         winreg_SetKeySecurity                   reg_setkeysecurity
  49  * 0x16         winreg_SetValue                         reg_setvalue
  50  * 0x17         winreg_UnLoadKey
  51  * 0x18         winreg_InitiateSystemShutdown
  52  * 0x19         winreg_AbortSystemShutdown
  53  * 0x1a         winreg_GetVersion                       reg_getversion
  54  * 0x1b         winreg_OpenHKCC
  55  * 0x1c         winreg_OpenHKDD
  56  * 0x1d         winreg_QueryMultipleValues              reg_querymultiplevalues
  57  * 0x1e         winreg_InitiateSystemShutdownEx
  58  * 0x1f         winreg_SaveKeyEx
  59  * 0x20         winreg_OpenHKPT
  60  * 0x21         winreg_OpenHKPN
  61  * 0x22         winreg_QueryMultipleValues2             reg_querymultiplevalues
  62  *
  63  */
  64
  65 #include "includes.h"
  66 #include "registry.h"
  67 #include "reg_api.h"
  68 #include "reg_cachehook.h"
  69 #include "reg_backend_db.h"
  70 #include "reg_dispatcher.h"
  71 #include "reg_objects.h"
  72 #include "../librpc/gen_ndr/ndr_security.h"
  73
  74 #undef DBGC_CLASS
  75 #define DBGC_CLASS DBGC_REGISTRY
  76
  77
  78 /**********************************************************************
  79  * Helper functions
  80  **********************************************************************/
  81
  82 static WERROR fill_value_cache(struct registry_key *key)
  83 {
  84         WERROR werr;
  85
  86         if (key->values != NULL) {
  87                 if (!reg_values_need_update(key->key, key->values)) {
  88                         return WERR_OK;
  89                 }
  90         }
  91
  92         TALLOC_FREE(key->values);
  93         werr = regval_ctr_init(key, &(key->values));
  94         W_ERROR_NOT_OK_RETURN(werr);
  95
  96         if (fetch_reg_values(key->key, key->values) == -1) {
  97                 TALLOC_FREE(key->values);
  98                 return WERR_BADFILE;
  99         }
 100
 101         return WERR_OK;
 102 }
 103
 104 static WERROR fill_subkey_cache(struct registry_key *key)
 105 {
 106         WERROR werr;
 107
 108         if (key->subkeys != NULL) {
 109                 if (!reg_subkeys_need_update(key->key, key->subkeys)) {
 110                         return WERR_OK;
 111                 }
 112         }
 113
 114         TALLOC_FREE(key->subkeys);
 115         werr = regsubkey_ctr_init(key, &(key->subkeys));
 116         W_ERROR_NOT_OK_RETURN(werr);
 117
 118         if (fetch_reg_keys(key->key, key->subkeys) == -1) {
 119                 TALLOC_FREE(key->subkeys);
 120                 return WERR_NO_MORE_ITEMS;
 121         }
 122
 123         return WERR_OK;
 124 }
 125
 126 static int regkey_destructor(struct registry_key_handle *key)
 127 {
 128         return regdb_close();
 129 }
 130
 131 static WERROR regkey_open_onelevel(TALLOC_CTX *mem_ctx,
 132                                    struct registry_key *parent,
 133                                    const char *name,
 134                                    const struct security_token *token,
 135                                    uint32 access_desired,
 136                                    struct registry_key **pregkey)
 137 {
 138         WERROR          result = WERR_OK;
 139         struct registry_key *regkey;
 140         struct registry_key_handle *key;
 141         struct regsubkey_ctr    *subkeys = NULL;
 142
 143         DEBUG(7,("regkey_open_onelevel: name = [%s]\n", name));
 144
 145         SMB_ASSERT(strchr(name, '\\') == NULL);
 146
 147         if (!(regkey = talloc_zero(mem_ctx, struct registry_key)) ||
 148             !(regkey->token = dup_nt_token(regkey, token)) ||
 149             !(regkey->key = talloc_zero(regkey, struct registry_key_handle)))
 150         {
 151                 result = WERR_NOMEM;
 152                 goto done;
 153         }
 154
 155         if ( !(W_ERROR_IS_OK(result = regdb_open())) ) {
 156                 goto done;
 157         }
 158
 159         key = regkey->key;
 160         talloc_set_destructor(key, regkey_destructor);
 161
 162         /* initialization */
 163
 164         key->type = REG_KEY_GENERIC;
 165
 166         if (name[0] == '\0') {
 167                 /*
 168                  * Open a copy of the parent key
 169                  */
 170                 if (!parent) {
 171                         result = WERR_BADFILE;
 172                         goto done;
 173                 }
 174                 key->name = talloc_strdup(key, parent->key->name);
 175         }
 176         else {
 177                 /*
 178                  * Normal subkey open
 179                  */
 180                 key->name = talloc_asprintf(key, "%s%s%s",
 181                                             parent ? parent->key->name : "",
 182                                             parent ? "\\": "",
 183                                             name);
 184         }
 185
 186         if (key->name == NULL) {
 187                 result = WERR_NOMEM;
 188                 goto done;
 189         }
 190
 191         /* Tag this as a Performance Counter Key */
 192
 193         if( strncasecmp_m(key->name, KEY_HKPD, strlen(KEY_HKPD)) == 0 )
 194                 key->type = REG_KEY_HKPD;
 195
 196         /* Look up the table of registry I/O operations */
 197
 198         if ( !(key->ops = reghook_cache_find( key->name )) ) {
 199                 DEBUG(0,("reg_open_onelevel: Failed to assign "
 200                          "registry_ops to [%s]\n", key->name ));
 201                 result = WERR_BADFILE;
 202                 goto done;
 203         }
 204
 205         /* check if the path really exists; failed is indicated by -1 */
 206         /* if the subkey count failed, bail out */
 207
 208         result = regsubkey_ctr_init(key, &subkeys);
 209         if (!W_ERROR_IS_OK(result)) {
 210                 goto done;
 211         }
 212
 213         if ( fetch_reg_keys( key, subkeys ) == -1 )  {
 214                 result = WERR_BADFILE;
 215                 goto done;
 216         }
 217
 218         TALLOC_FREE( subkeys );
 219
 220         if ( !regkey_access_check( key, access_desired, &key->access_granted,
 221                                    token ) ) {
 222                 result = WERR_ACCESS_DENIED;
 223                 goto done;
 224         }
 225
 226         *pregkey = regkey;
 227         result = WERR_OK;
 228
 229 done:
 230         if ( !W_ERROR_IS_OK(result) ) {
 231                 TALLOC_FREE(regkey);
 232         }
 233
 234         return result;
 235 }
 236
 237 WERROR reg_openhive(TALLOC_CTX *mem_ctx, const char *hive,
 238                     uint32 desired_access,
 239                     const struct security_token *token,
 240                     struct registry_key **pkey)
 241 {
 242         SMB_ASSERT(hive != NULL);
 243         SMB_ASSERT(hive[0] != '\0');
 244         SMB_ASSERT(strchr(hive, '\\') == NULL);
 245
 246         return regkey_open_onelevel(mem_ctx, NULL, hive, token, desired_access,
 247                                     pkey);
 248 }
 249
 250
 251 /**********************************************************************
 252  * The API functions
 253  **********************************************************************/
 254
 255 WERROR reg_openkey(TALLOC_CTX *mem_ctx, struct registry_key *parent,
 256                    const char *name, uint32 desired_access,
 257                    struct registry_key **pkey)
 258 {
 259         struct registry_key *direct_parent = parent;
 260         WERROR err;
 261         char *p, *path, *to_free;
 262         size_t len;
 263
 264         if (!(path = SMB_STRDUP(name))) {
 265                 return WERR_NOMEM;
 266         }
 267         to_free = path;
 268
 269         len = strlen(path);
 270
 271         if ((len > 0) && (path[len-1] == '\\')) {
 272                 path[len-1] = '\0';
 273         }
 274
 275         while ((p = strchr(path, '\\')) != NULL) {
 276                 char *name_component;
 277                 struct registry_key *tmp;
 278
 279                 if (!(name_component = SMB_STRNDUP(path, (p - path)))) {
 280                         err = WERR_NOMEM;
 281                         goto error;
 282                 }
 283
 284                 err = regkey_open_onelevel(mem_ctx, direct_parent,
 285                                            name_component, parent->token,
 286                                            KEY_ENUMERATE_SUB_KEYS, &tmp);
 287                 SAFE_FREE(name_component);
 288
 289                 if (!W_ERROR_IS_OK(err)) {
 290                         goto error;
 291                 }
 292                 if (direct_parent != parent) {
 293                         TALLOC_FREE(direct_parent);
 294                 }
 295
 296                 direct_parent = tmp;
 297                 path = p+1;
 298         }
 299
 300         err = regkey_open_onelevel(mem_ctx, direct_parent, path, parent->token,
 301                                    desired_access, pkey);
 302  error:
 303         if (direct_parent != parent) {
 304                 TALLOC_FREE(direct_parent);
 305         }
 306         SAFE_FREE(to_free);
 307         return err;
 308 }
 309
 310 WERROR reg_enumkey(TALLOC_CTX *mem_ctx, struct registry_key *key,
 311                    uint32 idx, char **name, NTTIME *last_write_time)
 312 {
 313         WERROR err;
 314
 315         if (!(key->key->access_granted & KEY_ENUMERATE_SUB_KEYS)) {
 316                 return WERR_ACCESS_DENIED;
 317         }
 318
 319         if (!W_ERROR_IS_OK(err = fill_subkey_cache(key))) {
 320                 return err;
 321         }
 322
 323         if (idx >= regsubkey_ctr_numkeys(key->subkeys)) {
 324                 return WERR_NO_MORE_ITEMS;
 325         }
 326
 327         if (!(*name = talloc_strdup(mem_ctx,
 328                         regsubkey_ctr_specific_key(key->subkeys, idx))))
 329         {
 330                 return WERR_NOMEM;
 331         }
 332
 333         if (last_write_time) {
 334                 *last_write_time = 0;
 335         }
 336
 337         return WERR_OK;
 338 }
 339
 340 WERROR reg_enumvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 341                      uint32 idx, char **pname, struct registry_value **pval)
 342 {
 343         struct registry_value *val;
 344         struct regval_blob *blob;
 345         WERROR err;
 346
 347         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 348                 return WERR_ACCESS_DENIED;
 349         }
 350
 351         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 352                 return err;
 353         }
 354
 355         if (idx >= regval_ctr_numvals(key->values)) {
 356                 return WERR_NO_MORE_ITEMS;
 357         }
 358
 359         blob = regval_ctr_specific_value(key->values, idx);
 360
 361         val = talloc_zero(mem_ctx, struct registry_value);
 362         if (val == NULL) {
 363                 return WERR_NOMEM;
 364         }
 365
 366         val->type = regval_type(blob);
 367         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 368
 369         if (pname
 370             && !(*pname = talloc_strdup(
 371                          mem_ctx, regval_name(blob)))) {
 372                 TALLOC_FREE(val);
 373                 return WERR_NOMEM;
 374         }
 375
 376         *pval = val;
 377         return WERR_OK;
 378 }
 379
 380 static WERROR reg_enumvalue_nocachefill(TALLOC_CTX *mem_ctx,
 381                                         struct registry_key *key,
 382                                         uint32 idx, char **pname,
 383                                         struct registry_value **pval)
 384 {
 385         struct registry_value *val;
 386         struct regval_blob *blob;
 387
 388         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 389                 return WERR_ACCESS_DENIED;
 390         }
 391
 392         if (idx >= regval_ctr_numvals(key->values)) {
 393                 return WERR_NO_MORE_ITEMS;
 394         }
 395
 396         blob = regval_ctr_specific_value(key->values, idx);
 397
 398         val = talloc_zero(mem_ctx, struct registry_value);
 399         if (val == NULL) {
 400                 return WERR_NOMEM;
 401         }
 402
 403         val->type = regval_type(blob);
 404         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 405
 406         if (pname
 407             && !(*pname = talloc_strdup(
 408                          mem_ctx, regval_name(blob)))) {
 409                 TALLOC_FREE(val);
 410                 return WERR_NOMEM;
 411         }
 412
 413         *pval = val;
 414         return WERR_OK;
 415 }
 416
 417 WERROR reg_queryvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 418                       const char *name, struct registry_value **pval)
 419 {
 420         WERROR err;
 421         uint32 i;
 422
 423         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 424                 return WERR_ACCESS_DENIED;
 425         }
 426
 427         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 428                 return err;
 429         }
 430
 431         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 432                 struct regval_blob *blob;
 433                 blob = regval_ctr_specific_value(key->values, i);
 434                 if (strequal(regval_name(blob), name)) {
 435                         /*
 436                          * don't use reg_enumvalue here:
 437                          * re-reading the values from the disk
 438                          * would change the indexing and break
 439                          * this function.
 440                          */
 441                         return reg_enumvalue_nocachefill(mem_ctx, key, i,
 442                                                          NULL, pval);
 443                 }
 444         }
 445
 446         return WERR_BADFILE;
 447 }
 448
 449 WERROR reg_querymultiplevalues(TALLOC_CTX *mem_ctx,
 450                                struct registry_key *key,
 451                                uint32_t num_names,
 452                                const char **names,
 453                                uint32_t *pnum_vals,
 454                                struct registry_value **pvals)
 455 {
 456         WERROR err;
 457         uint32_t i, n, found = 0;
 458         struct registry_value *vals;
 459
 460         if (num_names == 0) {
 461                 return WERR_OK;
 462         }
 463
 464         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 465                 return WERR_ACCESS_DENIED;
 466         }
 467
 468         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 469                 return err;
 470         }
 471
 472         vals = talloc_zero_array(mem_ctx, struct registry_value, num_names);
 473         if (vals == NULL) {
 474                 return WERR_NOMEM;
 475         }
 476
 477         for (n=0; n < num_names; n++) {
 478                 for (i=0; i < regval_ctr_numvals(key->values); i++) {
 479                         struct regval_blob *blob;
 480                         blob = regval_ctr_specific_value(key->values, i);
 481                         if (strequal(regval_name(blob), names[n])) {
 482                                 struct registry_value *v;
 483                                 err = reg_enumvalue(mem_ctx, key, i, NULL, &v);
 484                                 if (!W_ERROR_IS_OK(err)) {
 485                                         return err;
 486                                 }
 487                                 vals[n] = *v;
 488                                 found++;
 489                         }
 490                 }
 491         }
 492
 493         *pvals = vals;
 494         *pnum_vals = found;
 495
 496         return WERR_OK;
 497 }
 498
 499 WERROR reg_queryinfokey(struct registry_key *key, uint32_t *num_subkeys,
 500                         uint32_t *max_subkeylen, uint32_t *max_subkeysize,
 501                         uint32_t *num_values, uint32_t *max_valnamelen,
 502                         uint32_t *max_valbufsize, uint32_t *secdescsize,
 503                         NTTIME *last_changed_time)
 504 {
 505         uint32 i, max_size;
 506         size_t max_len;
 507         TALLOC_CTX *mem_ctx;
 508         WERROR err;
 509         struct security_descriptor *secdesc;
 510
 511         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 512                 return WERR_ACCESS_DENIED;
 513         }
 514
 515         if (!W_ERROR_IS_OK(fill_subkey_cache(key)) ||
 516             !W_ERROR_IS_OK(fill_value_cache(key))) {
 517                 return WERR_BADFILE;
 518         }
 519
 520         max_len = 0;
 521         for (i=0; i< regsubkey_ctr_numkeys(key->subkeys); i++) {
 522                 max_len = MAX(max_len,
 523                         strlen(regsubkey_ctr_specific_key(key->subkeys, i)));
 524         }
 525
 526         *num_subkeys = regsubkey_ctr_numkeys(key->subkeys);
 527         *max_subkeylen = max_len;
 528         *max_subkeysize = 0;    /* Class length? */
 529
 530         max_len = 0;
 531         max_size = 0;
 532         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 533                 struct regval_blob *blob;
 534                 blob = regval_ctr_specific_value(key->values, i);
 535                 max_len = MAX(max_len, strlen(regval_name(blob)));
 536                 max_size = MAX(max_size, regval_size(blob));
 537         }
 538
 539         *num_values = regval_ctr_numvals(key->values);
 540         *max_valnamelen = max_len;
 541         *max_valbufsize = max_size;
 542
 543         if (!(mem_ctx = talloc_new(key))) {
 544                 return WERR_NOMEM;
 545         }
 546
 547         err = regkey_get_secdesc(mem_ctx, key->key, &secdesc);
 548         if (!W_ERROR_IS_OK(err)) {
 549                 TALLOC_FREE(mem_ctx);
 550                 return err;
 551         }
 552
 553         *secdescsize = ndr_size_security_descriptor(secdesc, 0);
 554         TALLOC_FREE(mem_ctx);
 555
 556         *last_changed_time = 0;
 557
 558         return WERR_OK;
 559 }
 560
 561 WERROR reg_createkey(TALLOC_CTX *ctx, struct registry_key *parent,
 562                      const char *subkeypath, uint32 desired_access,
 563                      struct registry_key **pkey,
 564                      enum winreg_CreateAction *paction)
 565 {
 566         struct registry_key *key = parent;
 567         struct registry_key *create_parent;
 568         TALLOC_CTX *mem_ctx;
 569         char *path, *end;
 570         WERROR err;
 571
 572         mem_ctx = talloc_new(ctx);
 573         if (mem_ctx == NULL) {
 574                 return WERR_NOMEM;
 575         }
 576
 577         path = talloc_strdup(mem_ctx, subkeypath);
 578         if (path == NULL) {
 579                 err = WERR_NOMEM;
 580                 goto done;
 581         }
 582
 583         err = regdb_transaction_start();
 584         if (!W_ERROR_IS_OK(err)) {
 585                 DEBUG(0, ("reg_createkey: failed to start transaction: %s\n",
 586                           win_errstr(err)));
 587                 goto done;
 588         }
 589
 590         while ((end = strchr(path, '\\')) != NULL) {
 591                 struct registry_key *tmp;
 592                 enum winreg_CreateAction action;
 593
 594                 *end = '\0';
 595
 596                 err = reg_createkey(mem_ctx, key, path,
 597                                     KEY_ENUMERATE_SUB_KEYS, &tmp, &action);
 598                 if (!W_ERROR_IS_OK(err)) {
 599                         goto trans_done;
 600                 }
 601
 602                 if (key != parent) {
 603                         TALLOC_FREE(key);
 604                 }
 605
 606                 key = tmp;
 607                 path = end+1;
 608         }
 609
 610         /*
 611          * At this point, "path" contains the one-element subkey of "key". We
 612          * can try to open it.
 613          */
 614
 615         err = reg_openkey(ctx, key, path, desired_access, pkey);
 616         if (W_ERROR_IS_OK(err)) {
 617                 if (paction != NULL) {
 618                         *paction = REG_OPENED_EXISTING_KEY;
 619                 }
 620                 goto trans_done;
 621         }
 622
 623         if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
 624                 /*
 625                  * Something but "notfound" has happened, so bail out
 626                  */
 627                 goto trans_done;
 628         }
 629
 630         /*
 631          * We have to make a copy of the current key, as we opened it only
 632          * with ENUM_SUBKEY access.
 633          */
 634
 635         err = reg_openkey(mem_ctx, key, "", KEY_CREATE_SUB_KEY,
 636                           &create_parent);
 637         if (!W_ERROR_IS_OK(err)) {
 638                 goto trans_done;
 639         }
 640
 641         /*
 642          * Actually create the subkey
 643          */
 644
 645         err = fill_subkey_cache(create_parent);
 646         if (!W_ERROR_IS_OK(err)) {
 647                 goto trans_done;
 648         }
 649
 650         err = create_reg_subkey(key->key, path);
 651         if (!W_ERROR_IS_OK(err)) {
 652                 goto trans_done;
 653         }
 654
 655         /*
 656          * Now open the newly created key
 657          */
 658
 659         err = reg_openkey(ctx, create_parent, path, desired_access, pkey);
 660         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 661                 *paction = REG_CREATED_NEW_KEY;
 662         }
 663
 664 trans_done:
 665         if (W_ERROR_IS_OK(err)) {
 666                 err = regdb_transaction_commit();
 667                 if (!W_ERROR_IS_OK(err)) {
 668                         DEBUG(0, ("reg_createkey: Error committing transaction: %s\n", win_errstr(err)));
 669                 }
 670         } else {
 671                 WERROR err1 = regdb_transaction_cancel();
 672                 if (!W_ERROR_IS_OK(err1)) {
 673                         DEBUG(0, ("reg_createkey: Error cancelling transaction: %s\n", win_errstr(err1)));
 674                 }
 675         }
 676
 677  done:
 678         TALLOC_FREE(mem_ctx);
 679         return err;
 680 }
 681
 682 static WERROR reg_deletekey_internal(TALLOC_CTX *mem_ctx,
 683                                      struct registry_key *parent,
 684                                      const char *path, bool lazy)
 685 {
 686         WERROR err;
 687         char *name, *end;
 688         struct registry_key *key;
 689         name = talloc_strdup(mem_ctx, path);
 690         if (name == NULL) {
 691                 err = WERR_NOMEM;
 692                 goto done;
 693         }
 694
 695         /* no subkeys - proceed with delete */
 696         end = strrchr(name, '\\');
 697         if (end != NULL) {
 698                 *end = '\0';
 699
 700                 err = reg_openkey(mem_ctx, parent, name,
 701                                   KEY_CREATE_SUB_KEY, &key);
 702                 W_ERROR_NOT_OK_GOTO_DONE(err);
 703
 704                 parent = key;
 705                 name = end+1;
 706         }
 707
 708         if (name[0] == '\0') {
 709                 err = WERR_INVALID_PARAM;
 710                 goto done;
 711         }
 712
 713         err = delete_reg_subkey(parent->key, name, lazy);
 714
 715 done:
 716         return err;
 717 }
 718
 719 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 720 {
 721         WERROR err;
 722         struct registry_key *key;
 723         TALLOC_CTX *mem_ctx = talloc_stackframe();
 724
 725         /* check if the key has subkeys */
 726         err = reg_openkey(mem_ctx, parent, path, REG_KEY_READ, &key);
 727         W_ERROR_NOT_OK_GOTO_DONE(err);
 728
 729         err = regdb_transaction_start();
 730         if (!W_ERROR_IS_OK(err)) {
 731                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 732                           win_errstr(err)));
 733                 goto done;
 734         }
 735
 736         err = fill_subkey_cache(key);
 737         if (!W_ERROR_IS_OK(err)) {
 738                 goto trans_done;
 739         }
 740
 741         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 742                 err = WERR_ACCESS_DENIED;
 743                 goto trans_done;
 744         }
 745         err = reg_deletekey_internal(mem_ctx, parent, path, false);
 746
 747 trans_done:
 748         if (W_ERROR_IS_OK(err)) {
 749                 err = regdb_transaction_commit();
 750                 if (!W_ERROR_IS_OK(err)) {
 751                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 752                 }
 753         } else {
 754                 WERROR err1 = regdb_transaction_cancel();
 755                 if (!W_ERROR_IS_OK(err1)) {
 756                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 757                 }
 758         }
 759
 760 done:
 761         TALLOC_FREE(mem_ctx);
 762         return err;
 763 }
 764
 765
 766 WERROR reg_setvalue(struct registry_key *key, const char *name,
 767                     const struct registry_value *val)
 768 {
 769         struct regval_blob *existing;
 770         WERROR err;
 771         int res;
 772
 773         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 774                 return WERR_ACCESS_DENIED;
 775         }
 776
 777         err = regdb_transaction_start();
 778         if (!W_ERROR_IS_OK(err)) {
 779                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 780                           win_errstr(err)));
 781                 return err;
 782         }
 783
 784         err = fill_value_cache(key);
 785         if (!W_ERROR_IS_OK(err)) {
 786                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 787                 goto done;
 788         }
 789
 790         existing = regval_ctr_getvalue(key->values, name);
 791
 792         if ((existing != NULL) &&
 793             (regval_size(existing) == val->data.length) &&
 794             (memcmp(regval_data_p(existing), val->data.data,
 795                     val->data.length) == 0))
 796         {
 797                 err = WERR_OK;
 798                 goto done;
 799         }
 800
 801         res = regval_ctr_addvalue(key->values, name, val->type,
 802                                   val->data.data, val->data.length);
 803
 804         if (res == 0) {
 805                 TALLOC_FREE(key->values);
 806                 err = WERR_NOMEM;
 807                 goto done;
 808         }
 809
 810         if (!store_reg_values(key->key, key->values)) {
 811                 TALLOC_FREE(key->values);
 812                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 813                 err = WERR_REG_IO_FAILURE;
 814                 goto done;
 815         }
 816
 817         err = WERR_OK;
 818
 819 done:
 820         if (W_ERROR_IS_OK(err)) {
 821                 err = regdb_transaction_commit();
 822                 if (!W_ERROR_IS_OK(err)) {
 823                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 824                 }
 825         } else {
 826                 WERROR err1 = regdb_transaction_cancel();
 827                 if (!W_ERROR_IS_OK(err1)) {
 828                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 829                 }
 830         }
 831
 832         return err;
 833 }
 834
 835 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 836 {
 837         struct regval_blob *blob;
 838
 839         blob = regval_ctr_getvalue(key->values, name);
 840
 841         if (blob == NULL) {
 842                 return WERR_BADFILE;
 843         } else {
 844                 return WERR_OK;
 845         }
 846 }
 847
 848 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 849 {
 850         WERROR err;
 851
 852         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 853                 return WERR_ACCESS_DENIED;
 854         }
 855
 856         err = regdb_transaction_start();
 857         if (!W_ERROR_IS_OK(err)) {
 858                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 859                           win_errstr(err)));
 860                 return err;
 861         }
 862
 863         err = fill_value_cache(key);
 864         if (!W_ERROR_IS_OK(err)) {
 865                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 866                           win_errstr(err)));
 867                 goto done;
 868         }
 869
 870         err = reg_value_exists(key, name);
 871         if (!W_ERROR_IS_OK(err)) {
 872                 goto done;
 873         }
 874
 875         regval_ctr_delvalue(key->values, name);
 876
 877         if (!store_reg_values(key->key, key->values)) {
 878                 TALLOC_FREE(key->values);
 879                 err = WERR_REG_IO_FAILURE;
 880                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 881                 goto done;
 882         }
 883
 884         err = WERR_OK;
 885
 886 done:
 887         if (W_ERROR_IS_OK(err)) {
 888                 err = regdb_transaction_commit();
 889                 if (!W_ERROR_IS_OK(err)) {
 890                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 891                 }
 892         } else {
 893                 WERROR err1 = regdb_transaction_cancel();
 894                 if (!W_ERROR_IS_OK(err1)) {
 895                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 896                 }
 897         }
 898
 899         return err;
 900 }
 901
 902 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 903                           struct security_descriptor **psecdesc)
 904 {
 905         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 906 }
 907
 908 WERROR reg_setkeysecurity(struct registry_key *key,
 909                           struct security_descriptor *psecdesc)
 910 {
 911         return regkey_set_secdesc(key->key, psecdesc);
 912 }
 913
 914 WERROR reg_getversion(uint32_t *version)
 915 {
 916         if (version == NULL) {
 917                 return WERR_INVALID_PARAM;
 918         }
 919
 920         *version = 0x00000005; /* Windows 2000 registry API version */
 921         return WERR_OK;
 922 }
 923
 924 /**********************************************************************
 925  * Higher level utility functions
 926  **********************************************************************/
 927
 928 WERROR reg_deleteallvalues(struct registry_key *key)
 929 {
 930         WERROR err;
 931         int i;
 932
 933         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 934                 return WERR_ACCESS_DENIED;
 935         }
 936
 937         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 938                 return err;
 939         }
 940
 941         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 942                 struct regval_blob *blob;
 943                 blob = regval_ctr_specific_value(key->values, i);
 944                 regval_ctr_delvalue(key->values, regval_name(blob));
 945         }
 946
 947         if (!store_reg_values(key->key, key->values)) {
 948                 TALLOC_FREE(key->values);
 949                 return WERR_REG_IO_FAILURE;
 950         }
 951
 952         return WERR_OK;
 953 }
 954
 955 /*
 956  * Utility function to delete a registry key with all its subkeys.
 957  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 958  * key that has subkeys.
 959  */
 960 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 961                                                const char *path,
 962                                                bool del_key, bool lazy)
 963 {
 964         WERROR werr = WERR_OK;
 965         struct registry_key *key;
 966         char *subkey_name = NULL;
 967         uint32 i;
 968         TALLOC_CTX *mem_ctx = talloc_stackframe();
 969
 970         DEBUG(5, ("reg_deletekey_recursive_internal: deleting '%s' from '%s'\n",
 971                   path, parent->key->name));
 972
 973         /* recurse through subkeys first */
 974         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 975         if (!W_ERROR_IS_OK(werr)) {
 976                 DEBUG(3, ("reg_deletekey_recursive_internal: error opening "
 977                           "subkey '%s' of '%s': '%s'\n",
 978                           path, parent->key->name, win_errstr(werr)));
 979                 goto done;
 980         }
 981
 982         werr = fill_subkey_cache(key);
 983         W_ERROR_NOT_OK_GOTO_DONE(werr);
 984
 985         /*
 986          * loop from top to bottom for perfomance:
 987          * this way, we need to rehash the regsubkey containers less
 988          */
 989         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 990                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 991                 werr = reg_deletekey_recursive_internal(key, subkey_name, true, del_key);
 992                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 993         }
 994
 995         if (del_key) {
 996                 /* now delete the actual key */
 997                 werr = reg_deletekey_internal(mem_ctx, parent, path, lazy);
 998         }
 999
1000 done:
1001
1002         DEBUG(5, ("reg_deletekey_recursive_internal: done deleting '%s' from "
1003                   "'%s': %s\n",
1004                   path, parent->key->name, win_errstr(werr)));
1005         TALLOC_FREE(mem_ctx);
1006         return werr;
1007 }
1008
1009 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
1010                                             const char *path,
1011                                             bool del_key)
1012 {
1013         WERROR werr;
1014
1015         werr = regdb_transaction_start();
1016         if (!W_ERROR_IS_OK(werr)) {
1017                 DEBUG(0, ("reg_deletekey_recursive_trans: "
1018                           "error starting transaction: %s\n",
1019                           win_errstr(werr)));
1020                 return werr;
1021         }
1022
1023         werr = reg_deletekey_recursive_internal(parent, path, del_key, false);
1024
1025         if (!W_ERROR_IS_OK(werr)) {
1026                 WERROR werr2;
1027
1028                 DEBUG(1, (__location__ " failed to delete key '%s' from key "
1029                           "'%s': %s\n", path, parent->key->name,
1030                           win_errstr(werr)));
1031
1032                 werr2 = regdb_transaction_cancel();
1033                 if (!W_ERROR_IS_OK(werr2)) {
1034                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1035                                   "error cancelling transaction: %s\n",
1036                                   win_errstr(werr2)));
1037                         /*
1038                          * return the original werr or the
1039                          * error from cancelling the transaction?
1040                          */
1041                 }
1042         } else {
1043                 werr = regdb_transaction_commit();
1044                 if (!W_ERROR_IS_OK(werr)) {
1045                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1046                                   "error committing transaction: %s\n",
1047                                   win_errstr(werr)));
1048                 } else {
1049                         DEBUG(5, ("reg_reletekey_recursive_trans: deleted key '%s' from '%s'\n",
1050                                   path, parent->key->name));
1051
1052                 }
1053         }
1054
1055         return werr;
1056 }
1057
1058 WERROR reg_deletekey_recursive(struct registry_key *parent,
1059                                const char *path)
1060 {
1061         return reg_deletekey_recursive_trans(parent, path, true);
1062 }
1063
1064 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1065                                    const char *path)
1066 {
1067         return reg_deletekey_recursive_trans(parent, path, false);
1068 }
1069