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_NO_MORE_ITEMS;
 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         struct regsubkey_ctr    *subkeys = NULL;
 141
 142         DEBUG(7,("regkey_open_onelevel: name = [%s]\n", name));
 143
 144         SMB_ASSERT(strchr(name, '\\') == NULL);
 145
 146         if (!(regkey = TALLOC_ZERO_P(mem_ctx, struct registry_key)) ||
 147             !(regkey->token = dup_nt_token(regkey, token)) ||
 148             !(regkey->key = TALLOC_ZERO_P(regkey, struct registry_key_handle)))
 149         {
 150                 result = WERR_NOMEM;
 151                 goto done;
 152         }
 153
 154         result = regdb_open();
 155         if (!(W_ERROR_IS_OK(result))) {
 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(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         key->ops = reghook_cache_find( key->name );
 199         if (key->ops == NULL) {
 200                 DEBUG(0,("reg_open_onelevel: Failed to assign "
 201                          "registry_ops to [%s]\n", key->name ));
 202                 result = WERR_BADFILE;
 203                 goto done;
 204         }
 205
 206         /* check if the path really exists; failed is indicated by -1 */
 207         /* if the subkey count failed, bail out */
 208
 209         result = regsubkey_ctr_init(key, &subkeys);
 210         if (!W_ERROR_IS_OK(result)) {
 211                 goto done;
 212         }
 213
 214         if ( fetch_reg_keys( key, subkeys ) == -1 )  {
 215                 result = WERR_BADFILE;
 216                 goto done;
 217         }
 218
 219         TALLOC_FREE( subkeys );
 220
 221         if ( !regkey_access_check( key, access_desired, &key->access_granted,
 222                                    token ) ) {
 223                 result = WERR_ACCESS_DENIED;
 224                 goto done;
 225         }
 226
 227         *pregkey = regkey;
 228         result = WERR_OK;
 229
 230 done:
 231         if ( !W_ERROR_IS_OK(result) ) {
 232                 TALLOC_FREE(regkey);
 233         }
 234
 235         return result;
 236 }
 237
 238 WERROR reg_openhive(TALLOC_CTX *mem_ctx, const char *hive,
 239                     uint32 desired_access,
 240                     const struct security_token *token,
 241                     struct registry_key **pkey)
 242 {
 243         SMB_ASSERT(hive != NULL);
 244         SMB_ASSERT(hive[0] != '\0');
 245         SMB_ASSERT(strchr(hive, '\\') == NULL);
 246
 247         return regkey_open_onelevel(mem_ctx, NULL, hive, token, desired_access,
 248                                     pkey);
 249 }
 250
 251
 252 /**********************************************************************
 253  * The API functions
 254  **********************************************************************/
 255
 256 WERROR reg_openkey(TALLOC_CTX *mem_ctx, struct registry_key *parent,
 257                    const char *name, uint32 desired_access,
 258                    struct registry_key **pkey)
 259 {
 260         struct registry_key *direct_parent = parent;
 261         WERROR err;
 262         char *p, *path, *to_free;
 263         size_t len;
 264
 265         if (!(path = SMB_STRDUP(name))) {
 266                 return WERR_NOMEM;
 267         }
 268         to_free = path;
 269
 270         len = strlen(path);
 271
 272         if ((len > 0) && (path[len-1] == '\\')) {
 273                 path[len-1] = '\0';
 274         }
 275
 276         while ((p = strchr(path, '\\')) != NULL) {
 277                 char *name_component;
 278                 struct registry_key *tmp;
 279
 280                 if (!(name_component = SMB_STRNDUP(path, (p - path)))) {
 281                         err = WERR_NOMEM;
 282                         goto error;
 283                 }
 284
 285                 err = regkey_open_onelevel(mem_ctx, direct_parent,
 286                                            name_component, parent->token,
 287                                            KEY_ENUMERATE_SUB_KEYS, &tmp);
 288                 SAFE_FREE(name_component);
 289
 290                 if (!W_ERROR_IS_OK(err)) {
 291                         goto error;
 292                 }
 293                 if (direct_parent != parent) {
 294                         TALLOC_FREE(direct_parent);
 295                 }
 296
 297                 direct_parent = tmp;
 298                 path = p+1;
 299         }
 300
 301         err = regkey_open_onelevel(mem_ctx, direct_parent, path, parent->token,
 302                                    desired_access, pkey);
 303  error:
 304         if (direct_parent != parent) {
 305                 TALLOC_FREE(direct_parent);
 306         }
 307         SAFE_FREE(to_free);
 308         return err;
 309 }
 310
 311 WERROR reg_enumkey(TALLOC_CTX *mem_ctx, struct registry_key *key,
 312                    uint32 idx, char **name, NTTIME *last_write_time)
 313 {
 314         WERROR err;
 315
 316         if (!(key->key->access_granted & KEY_ENUMERATE_SUB_KEYS)) {
 317                 return WERR_ACCESS_DENIED;
 318         }
 319
 320         if (!W_ERROR_IS_OK(err = fill_subkey_cache(key))) {
 321                 return err;
 322         }
 323
 324         if (idx >= regsubkey_ctr_numkeys(key->subkeys)) {
 325                 return WERR_NO_MORE_ITEMS;
 326         }
 327
 328         if (!(*name = talloc_strdup(mem_ctx,
 329                         regsubkey_ctr_specific_key(key->subkeys, idx))))
 330         {
 331                 return WERR_NOMEM;
 332         }
 333
 334         if (last_write_time) {
 335                 *last_write_time = 0;
 336         }
 337
 338         return WERR_OK;
 339 }
 340
 341 WERROR reg_enumvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 342                      uint32 idx, char **pname, struct registry_value **pval)
 343 {
 344         struct registry_value *val;
 345         struct regval_blob *blob;
 346         WERROR err;
 347
 348         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 349                 return WERR_ACCESS_DENIED;
 350         }
 351
 352         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 353                 return err;
 354         }
 355
 356         if (idx >= regval_ctr_numvals(key->values)) {
 357                 return WERR_NO_MORE_ITEMS;
 358         }
 359
 360         blob = regval_ctr_specific_value(key->values, idx);
 361
 362         val = talloc_zero(mem_ctx, struct registry_value);
 363         if (val == NULL) {
 364                 return WERR_NOMEM;
 365         }
 366
 367         val->type = regval_type(blob);
 368         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 369
 370         if (pname
 371             && !(*pname = talloc_strdup(
 372                          mem_ctx, regval_name(blob)))) {
 373                 TALLOC_FREE(val);
 374                 return WERR_NOMEM;
 375         }
 376
 377         *pval = val;
 378         return WERR_OK;
 379 }
 380
 381 static WERROR reg_enumvalue_nocachefill(TALLOC_CTX *mem_ctx,
 382                                         struct registry_key *key,
 383                                         uint32 idx, char **pname,
 384                                         struct registry_value **pval)
 385 {
 386         struct registry_value *val;
 387         struct regval_blob *blob;
 388
 389         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 390                 return WERR_ACCESS_DENIED;
 391         }
 392
 393         if (idx >= regval_ctr_numvals(key->values)) {
 394                 return WERR_NO_MORE_ITEMS;
 395         }
 396
 397         blob = regval_ctr_specific_value(key->values, idx);
 398
 399         val = talloc_zero(mem_ctx, struct registry_value);
 400         if (val == NULL) {
 401                 return WERR_NOMEM;
 402         }
 403
 404         val->type = regval_type(blob);
 405         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 406
 407         if (pname
 408             && !(*pname = talloc_strdup(
 409                          mem_ctx, regval_name(blob)))) {
 410                 TALLOC_FREE(val);
 411                 return WERR_NOMEM;
 412         }
 413
 414         *pval = val;
 415         return WERR_OK;
 416 }
 417
 418 WERROR reg_queryvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 419                       const char *name, struct registry_value **pval)
 420 {
 421         WERROR err;
 422         uint32 i;
 423
 424         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 425                 return WERR_ACCESS_DENIED;
 426         }
 427
 428         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 429                 return err;
 430         }
 431
 432         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 433                 struct regval_blob *blob;
 434                 blob = regval_ctr_specific_value(key->values, i);
 435                 if (strequal(regval_name(blob), name)) {
 436                         /*
 437                          * don't use reg_enumvalue here:
 438                          * re-reading the values from the disk
 439                          * would change the indexing and break
 440                          * this function.
 441                          */
 442                         return reg_enumvalue_nocachefill(mem_ctx, key, i,
 443                                                          NULL, pval);
 444                 }
 445         }
 446
 447         return WERR_BADFILE;
 448 }
 449
 450 WERROR reg_querymultiplevalues(TALLOC_CTX *mem_ctx,
 451                                struct registry_key *key,
 452                                uint32_t num_names,
 453                                const char **names,
 454                                uint32_t *pnum_vals,
 455                                struct registry_value **pvals)
 456 {
 457         WERROR err;
 458         uint32_t i, n, found = 0;
 459         struct registry_value *vals;
 460
 461         if (num_names == 0) {
 462                 return WERR_OK;
 463         }
 464
 465         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 466                 return WERR_ACCESS_DENIED;
 467         }
 468
 469         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 470                 return err;
 471         }
 472
 473         vals = talloc_zero_array(mem_ctx, struct registry_value, num_names);
 474         if (vals == NULL) {
 475                 return WERR_NOMEM;
 476         }
 477
 478         for (n=0; n < num_names; n++) {
 479                 for (i=0; i < regval_ctr_numvals(key->values); i++) {
 480                         struct regval_blob *blob;
 481                         blob = regval_ctr_specific_value(key->values, i);
 482                         if (strequal(regval_name(blob), names[n])) {
 483                                 struct registry_value *v;
 484                                 err = reg_enumvalue(mem_ctx, key, i, NULL, &v);
 485                                 if (!W_ERROR_IS_OK(err)) {
 486                                         return err;
 487                                 }
 488                                 vals[n] = *v;
 489                                 found++;
 490                         }
 491                 }
 492         }
 493
 494         *pvals = vals;
 495         *pnum_vals = found;
 496
 497         return WERR_OK;
 498 }
 499
 500 WERROR reg_queryinfokey(struct registry_key *key, uint32_t *num_subkeys,
 501                         uint32_t *max_subkeylen, uint32_t *max_subkeysize,
 502                         uint32_t *num_values, uint32_t *max_valnamelen,
 503                         uint32_t *max_valbufsize, uint32_t *secdescsize,
 504                         NTTIME *last_changed_time)
 505 {
 506         uint32 i, max_size;
 507         size_t max_len;
 508         TALLOC_CTX *mem_ctx;
 509         WERROR err;
 510         struct security_descriptor *secdesc;
 511
 512         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 513                 return WERR_ACCESS_DENIED;
 514         }
 515
 516         if (!W_ERROR_IS_OK(fill_subkey_cache(key)) ||
 517             !W_ERROR_IS_OK(fill_value_cache(key))) {
 518                 return WERR_BADFILE;
 519         }
 520
 521         max_len = 0;
 522         for (i=0; i< regsubkey_ctr_numkeys(key->subkeys); i++) {
 523                 max_len = MAX(max_len,
 524                         strlen(regsubkey_ctr_specific_key(key->subkeys, i)));
 525         }
 526
 527         *num_subkeys = regsubkey_ctr_numkeys(key->subkeys);
 528         *max_subkeylen = max_len;
 529         *max_subkeysize = 0;    /* Class length? */
 530
 531         max_len = 0;
 532         max_size = 0;
 533         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 534                 struct regval_blob *blob;
 535                 blob = regval_ctr_specific_value(key->values, i);
 536                 max_len = MAX(max_len, strlen(regval_name(blob)));
 537                 max_size = MAX(max_size, regval_size(blob));
 538         }
 539
 540         *num_values = regval_ctr_numvals(key->values);
 541         *max_valnamelen = max_len;
 542         *max_valbufsize = max_size;
 543
 544         if (!(mem_ctx = talloc_new(key))) {
 545                 return WERR_NOMEM;
 546         }
 547
 548         err = regkey_get_secdesc(mem_ctx, key->key, &secdesc);
 549         if (!W_ERROR_IS_OK(err)) {
 550                 TALLOC_FREE(mem_ctx);
 551                 return err;
 552         }
 553
 554         *secdescsize = ndr_size_security_descriptor(secdesc, 0);
 555         TALLOC_FREE(mem_ctx);
 556
 557         *last_changed_time = 0;
 558
 559         return WERR_OK;
 560 }
 561
 562 WERROR reg_createkey(TALLOC_CTX *ctx, struct registry_key *parent,
 563                      const char *subkeypath, uint32 desired_access,
 564                      struct registry_key **pkey,
 565                      enum winreg_CreateAction *paction)
 566 {
 567         struct registry_key *key = parent;
 568         struct registry_key *create_parent;
 569         TALLOC_CTX *mem_ctx;
 570         char *path, *end;
 571         WERROR err;
 572
 573         mem_ctx = talloc_new(ctx);
 574         if (mem_ctx == NULL) {
 575                 return WERR_NOMEM;
 576         }
 577
 578         path = talloc_strdup(mem_ctx, subkeypath);
 579         if (path == NULL) {
 580                 err = WERR_NOMEM;
 581                 goto done;
 582         }
 583
 584         err = regdb_transaction_start();
 585         if (!W_ERROR_IS_OK(err)) {
 586                 DEBUG(0, ("reg_createkey: failed to start transaction: %s\n",
 587                           win_errstr(err)));
 588                 goto done;
 589         }
 590
 591         while ((end = strchr(path, '\\')) != NULL) {
 592                 struct registry_key *tmp;
 593                 enum winreg_CreateAction action;
 594
 595                 *end = '\0';
 596
 597                 err = reg_createkey(mem_ctx, key, path,
 598                                     KEY_ENUMERATE_SUB_KEYS, &tmp, &action);
 599                 if (!W_ERROR_IS_OK(err)) {
 600                         goto trans_done;
 601                 }
 602
 603                 if (key != parent) {
 604                         TALLOC_FREE(key);
 605                 }
 606
 607                 key = tmp;
 608                 path = end+1;
 609         }
 610
 611         /*
 612          * At this point, "path" contains the one-element subkey of "key". We
 613          * can try to open it.
 614          */
 615
 616         err = reg_openkey(ctx, key, path, desired_access, pkey);
 617         if (W_ERROR_IS_OK(err)) {
 618                 if (paction != NULL) {
 619                         *paction = REG_OPENED_EXISTING_KEY;
 620                 }
 621                 goto trans_done;
 622         }
 623
 624         if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
 625                 /*
 626                  * Something but "notfound" has happened, so bail out
 627                  */
 628                 goto trans_done;
 629         }
 630
 631         /*
 632          * We have to make a copy of the current key, as we opened it only
 633          * with ENUM_SUBKEY access.
 634          */
 635
 636         err = reg_openkey(mem_ctx, key, "", KEY_CREATE_SUB_KEY,
 637                           &create_parent);
 638         if (!W_ERROR_IS_OK(err)) {
 639                 goto trans_done;
 640         }
 641
 642         /*
 643          * Actually create the subkey
 644          */
 645
 646         err = fill_subkey_cache(create_parent);
 647         if (!W_ERROR_IS_OK(err)) {
 648                 goto trans_done;
 649         }
 650
 651         err = create_reg_subkey(key->key, path);
 652         if (!W_ERROR_IS_OK(err)) {
 653                 goto trans_done;
 654         }
 655
 656         /*
 657          * Now open the newly created key
 658          */
 659
 660         err = reg_openkey(ctx, create_parent, path, desired_access, pkey);
 661         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 662                 *paction = REG_CREATED_NEW_KEY;
 663         }
 664
 665 trans_done:
 666         if (W_ERROR_IS_OK(err)) {
 667                 err = regdb_transaction_commit();
 668                 if (!W_ERROR_IS_OK(err)) {
 669                         DEBUG(0, ("reg_createkey: Error committing transaction: %s\n", win_errstr(err)));
 670                 }
 671         } else {
 672                 WERROR err1 = regdb_transaction_cancel();
 673                 if (!W_ERROR_IS_OK(err1)) {
 674                         DEBUG(0, ("reg_createkey: Error cancelling transaction: %s\n", win_errstr(err1)));
 675                 }
 676         }
 677
 678  done:
 679         TALLOC_FREE(mem_ctx);
 680         return err;
 681 }
 682
 683 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 684 {
 685         WERROR err;
 686         char *name, *end;
 687         struct registry_key *tmp_key, *key;
 688         TALLOC_CTX *mem_ctx = talloc_stackframe();
 689
 690         name = talloc_strdup(mem_ctx, path);
 691         if (name == NULL) {
 692                 err = WERR_NOMEM;
 693                 goto done;
 694         }
 695
 696         /* check if the key has subkeys */
 697         err = reg_openkey(mem_ctx, parent, name, REG_KEY_READ, &key);
 698         W_ERROR_NOT_OK_GOTO_DONE(err);
 699
 700         err = regdb_transaction_start();
 701         if (!W_ERROR_IS_OK(err)) {
 702                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 703                           win_errstr(err)));
 704                 goto done;
 705         }
 706
 707         err = fill_subkey_cache(key);
 708         W_ERROR_NOT_OK_GOTO(err, trans_done);
 709
 710         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 711                 err = WERR_ACCESS_DENIED;
 712                 goto trans_done;
 713         }
 714
 715         /* no subkeys - proceed with delete */
 716         end = strrchr(name, '\\');
 717         if (end != NULL) {
 718                 *end = '\0';
 719
 720                 err = reg_openkey(mem_ctx, parent, name,
 721                                   KEY_CREATE_SUB_KEY, &tmp_key);
 722                 W_ERROR_NOT_OK_GOTO(err, trans_done);
 723
 724                 parent = tmp_key;
 725                 name = end+1;
 726         }
 727
 728         if (name[0] == '\0') {
 729                 err = WERR_INVALID_PARAM;
 730                 goto trans_done;
 731         }
 732
 733         err = delete_reg_subkey(parent->key, name);
 734
 735 trans_done:
 736         if (W_ERROR_IS_OK(err)) {
 737                 err = regdb_transaction_commit();
 738                 if (!W_ERROR_IS_OK(err)) {
 739                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 740                 }
 741         } else {
 742                 WERROR err1 = regdb_transaction_cancel();
 743                 if (!W_ERROR_IS_OK(err1)) {
 744                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 745                 }
 746         }
 747
 748 done:
 749         TALLOC_FREE(mem_ctx);
 750         return err;
 751 }
 752
 753 WERROR reg_setvalue(struct registry_key *key, const char *name,
 754                     const struct registry_value *val)
 755 {
 756         struct regval_blob *existing;
 757         WERROR err;
 758         int res;
 759
 760         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 761                 return WERR_ACCESS_DENIED;
 762         }
 763
 764         err = regdb_transaction_start();
 765         if (!W_ERROR_IS_OK(err)) {
 766                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 767                           win_errstr(err)));
 768                 return err;
 769         }
 770
 771         err = fill_value_cache(key);
 772         if (!W_ERROR_IS_OK(err)) {
 773                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 774                 goto done;
 775         }
 776
 777         existing = regval_ctr_getvalue(key->values, name);
 778
 779         if ((existing != NULL) &&
 780             (regval_size(existing) == val->data.length) &&
 781             (memcmp(regval_data_p(existing), val->data.data,
 782                     val->data.length) == 0))
 783         {
 784                 err = WERR_OK;
 785                 goto done;
 786         }
 787
 788         res = regval_ctr_addvalue(key->values, name, val->type,
 789                                   val->data.data, val->data.length);
 790
 791         if (res == 0) {
 792                 TALLOC_FREE(key->values);
 793                 err = WERR_NOMEM;
 794                 goto done;
 795         }
 796
 797         if (!store_reg_values(key->key, key->values)) {
 798                 TALLOC_FREE(key->values);
 799                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 800                 err = WERR_REG_IO_FAILURE;
 801                 goto done;
 802         }
 803
 804         err = WERR_OK;
 805
 806 done:
 807         if (W_ERROR_IS_OK(err)) {
 808                 err = regdb_transaction_commit();
 809                 if (!W_ERROR_IS_OK(err)) {
 810                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 811                 }
 812         } else {
 813                 WERROR err1 = regdb_transaction_cancel();
 814                 if (!W_ERROR_IS_OK(err1)) {
 815                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 816                 }
 817         }
 818
 819         return err;
 820 }
 821
 822 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 823 {
 824         struct regval_blob *blob;
 825
 826         blob = regval_ctr_getvalue(key->values, name);
 827
 828         if (blob == NULL) {
 829                 return WERR_BADFILE;
 830         } else {
 831                 return WERR_OK;
 832         }
 833 }
 834
 835 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 836 {
 837         WERROR err;
 838
 839         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 840                 return WERR_ACCESS_DENIED;
 841         }
 842
 843         err = regdb_transaction_start();
 844         if (!W_ERROR_IS_OK(err)) {
 845                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 846                           win_errstr(err)));
 847                 return err;
 848         }
 849
 850         err = fill_value_cache(key);
 851         if (!W_ERROR_IS_OK(err)) {
 852                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 853                           win_errstr(err)));
 854                 goto done;
 855         }
 856
 857         err = reg_value_exists(key, name);
 858         if (!W_ERROR_IS_OK(err)) {
 859                 goto done;
 860         }
 861
 862         regval_ctr_delvalue(key->values, name);
 863
 864         if (!store_reg_values(key->key, key->values)) {
 865                 TALLOC_FREE(key->values);
 866                 err = WERR_REG_IO_FAILURE;
 867                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 868                 goto done;
 869         }
 870
 871         err = WERR_OK;
 872
 873 done:
 874         if (W_ERROR_IS_OK(err)) {
 875                 err = regdb_transaction_commit();
 876                 if (!W_ERROR_IS_OK(err)) {
 877                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 878                 }
 879         } else {
 880                 WERROR err1 = regdb_transaction_cancel();
 881                 if (!W_ERROR_IS_OK(err1)) {
 882                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 883                 }
 884         }
 885
 886         return err;
 887 }
 888
 889 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 890                           struct security_descriptor **psecdesc)
 891 {
 892         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 893 }
 894
 895 WERROR reg_setkeysecurity(struct registry_key *key,
 896                           struct security_descriptor *psecdesc)
 897 {
 898         return regkey_set_secdesc(key->key, psecdesc);
 899 }
 900
 901 WERROR reg_getversion(uint32_t *version)
 902 {
 903         if (version == NULL) {
 904                 return WERR_INVALID_PARAM;
 905         }
 906
 907         *version = 0x00000005; /* Windows 2000 registry API version */
 908         return WERR_OK;
 909 }
 910
 911 /**********************************************************************
 912  * Higher level utility functions
 913  **********************************************************************/
 914
 915 WERROR reg_deleteallvalues(struct registry_key *key)
 916 {
 917         WERROR err;
 918         int i;
 919
 920         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 921                 return WERR_ACCESS_DENIED;
 922         }
 923
 924         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 925                 return err;
 926         }
 927
 928         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 929                 struct regval_blob *blob;
 930                 blob = regval_ctr_specific_value(key->values, i);
 931                 regval_ctr_delvalue(key->values, regval_name(blob));
 932         }
 933
 934         if (!store_reg_values(key->key, key->values)) {
 935                 TALLOC_FREE(key->values);
 936                 return WERR_REG_IO_FAILURE;
 937         }
 938
 939         return WERR_OK;
 940 }
 941
 942 /*
 943  * Utility function to delete a registry key with all its subkeys.
 944  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 945  * key that has subkeys.
 946  */
 947 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 948                                                const char *path,
 949                                                bool del_key)
 950 {
 951         WERROR werr = WERR_OK;
 952         struct registry_key *key;
 953         char *subkey_name = NULL;
 954         uint32 i;
 955         TALLOC_CTX *mem_ctx = talloc_stackframe();
 956
 957         /* recurse through subkeys first */
 958         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 959         if (!W_ERROR_IS_OK(werr)) {
 960                 goto done;
 961         }
 962
 963         werr = fill_subkey_cache(key);
 964         W_ERROR_NOT_OK_GOTO_DONE(werr);
 965
 966         /*
 967          * loop from top to bottom for perfomance:
 968          * this way, we need to rehash the regsubkey containers less
 969          */
 970         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 971                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 972                 werr = reg_deletekey_recursive_internal(key, subkey_name, true);
 973                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 974         }
 975
 976         if (del_key) {
 977                 /* now delete the actual key */
 978                 werr = reg_deletekey(parent, path);
 979         }
 980
 981 done:
 982         TALLOC_FREE(mem_ctx);
 983         return werr;
 984 }
 985
 986 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
 987                                             const char *path,
 988                                             bool del_key)
 989 {
 990         WERROR werr;
 991
 992         werr = regdb_transaction_start();
 993         if (!W_ERROR_IS_OK(werr)) {
 994                 DEBUG(0, ("reg_deletekey_recursive_trans: "
 995                           "error starting transaction: %s\n",
 996                           win_errstr(werr)));
 997                 return werr;
 998         }
 999
1000         werr = reg_deletekey_recursive_internal(parent, path, del_key);
1001
1002         if (!W_ERROR_IS_OK(werr)) {
1003                 WERROR werr2;
1004
1005                 DEBUG(1, (__location__ " failed to delete key '%s' from key "
1006                           "'%s': %s\n", path, parent->key->name,
1007                           win_errstr(werr)));
1008
1009                 werr2 = regdb_transaction_cancel();
1010                 if (!W_ERROR_IS_OK(werr2)) {
1011                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1012                                   "error cancelling transaction: %s\n",
1013                                   win_errstr(werr2)));
1014                         /*
1015                          * return the original werr or the
1016                          * error from cancelling the transaction?
1017                          */
1018                 }
1019         } else {
1020                 werr = regdb_transaction_commit();
1021                 if (!W_ERROR_IS_OK(werr)) {
1022                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1023                                   "error committing transaction: %s\n",
1024                                   win_errstr(werr)));
1025                 }
1026         }
1027
1028         return werr;
1029 }
1030
1031 WERROR reg_deletekey_recursive(struct registry_key *parent,
1032                                const char *path)
1033 {
1034         return reg_deletekey_recursive_trans(parent, path, true);
1035 }
1036
1037 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1038                                    const char *path)
1039 {
1040         return reg_deletekey_recursive_trans(parent, path, false);
1041 }
1042