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