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         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 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 683 {
 684         WERROR err;
 685         char *name, *end;
 686         struct registry_key *tmp_key, *key;
 687         TALLOC_CTX *mem_ctx = talloc_stackframe();
 688
 689         name = talloc_strdup(mem_ctx, path);
 690         if (name == NULL) {
 691                 err = WERR_NOMEM;
 692                 goto done;
 693         }
 694
 695         /* check if the key has subkeys */
 696         err = reg_openkey(mem_ctx, parent, name, REG_KEY_READ, &key);
 697         W_ERROR_NOT_OK_GOTO_DONE(err);
 698
 699         err = regdb_transaction_start();
 700         if (!W_ERROR_IS_OK(err)) {
 701                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 702                           win_errstr(err)));
 703                 goto done;
 704         }
 705
 706         err = fill_subkey_cache(key);
 707         W_ERROR_NOT_OK_GOTO(err, trans_done);
 708
 709         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 710                 err = WERR_ACCESS_DENIED;
 711                 goto trans_done;
 712         }
 713
 714         /* no subkeys - proceed with delete */
 715         end = strrchr(name, '\\');
 716         if (end != NULL) {
 717                 *end = '\0';
 718
 719                 err = reg_openkey(mem_ctx, parent, name,
 720                                   KEY_CREATE_SUB_KEY, &tmp_key);
 721                 W_ERROR_NOT_OK_GOTO(err, trans_done);
 722
 723                 parent = tmp_key;
 724                 name = end+1;
 725         }
 726
 727         if (name[0] == '\0') {
 728                 err = WERR_INVALID_PARAM;
 729                 goto trans_done;
 730         }
 731
 732         err = delete_reg_subkey(parent->key, name);
 733
 734 trans_done:
 735         if (W_ERROR_IS_OK(err)) {
 736                 err = regdb_transaction_commit();
 737                 if (!W_ERROR_IS_OK(err)) {
 738                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 739                 }
 740         } else {
 741                 WERROR err1 = regdb_transaction_cancel();
 742                 if (!W_ERROR_IS_OK(err1)) {
 743                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 744                 }
 745         }
 746
 747 done:
 748         TALLOC_FREE(mem_ctx);
 749         return err;
 750 }
 751
 752 WERROR reg_setvalue(struct registry_key *key, const char *name,
 753                     const struct registry_value *val)
 754 {
 755         struct regval_blob *existing;
 756         WERROR err;
 757         int res;
 758
 759         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 760                 return WERR_ACCESS_DENIED;
 761         }
 762
 763         err = regdb_transaction_start();
 764         if (!W_ERROR_IS_OK(err)) {
 765                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 766                           win_errstr(err)));
 767                 return err;
 768         }
 769
 770         err = fill_value_cache(key);
 771         if (!W_ERROR_IS_OK(err)) {
 772                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 773                 goto done;
 774         }
 775
 776         existing = regval_ctr_getvalue(key->values, name);
 777
 778         if ((existing != NULL) &&
 779             (regval_size(existing) == val->data.length) &&
 780             (memcmp(regval_data_p(existing), val->data.data,
 781                     val->data.length) == 0))
 782         {
 783                 err = WERR_OK;
 784                 goto done;
 785         }
 786
 787         res = regval_ctr_addvalue(key->values, name, val->type,
 788                                   val->data.data, val->data.length);
 789
 790         if (res == 0) {
 791                 TALLOC_FREE(key->values);
 792                 err = WERR_NOMEM;
 793                 goto done;
 794         }
 795
 796         if (!store_reg_values(key->key, key->values)) {
 797                 TALLOC_FREE(key->values);
 798                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 799                 err = WERR_REG_IO_FAILURE;
 800                 goto done;
 801         }
 802
 803         err = WERR_OK;
 804
 805 done:
 806         if (W_ERROR_IS_OK(err)) {
 807                 err = regdb_transaction_commit();
 808                 if (!W_ERROR_IS_OK(err)) {
 809                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 810                 }
 811         } else {
 812                 WERROR err1 = regdb_transaction_cancel();
 813                 if (!W_ERROR_IS_OK(err1)) {
 814                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 815                 }
 816         }
 817
 818         return err;
 819 }
 820
 821 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 822 {
 823         struct regval_blob *blob;
 824
 825         blob = regval_ctr_getvalue(key->values, name);
 826
 827         if (blob == NULL) {
 828                 return WERR_BADFILE;
 829         } else {
 830                 return WERR_OK;
 831         }
 832 }
 833
 834 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 835 {
 836         WERROR err;
 837
 838         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 839                 return WERR_ACCESS_DENIED;
 840         }
 841
 842         err = regdb_transaction_start();
 843         if (!W_ERROR_IS_OK(err)) {
 844                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 845                           win_errstr(err)));
 846                 return err;
 847         }
 848
 849         err = fill_value_cache(key);
 850         if (!W_ERROR_IS_OK(err)) {
 851                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 852                           win_errstr(err)));
 853                 goto done;
 854         }
 855
 856         err = reg_value_exists(key, name);
 857         if (!W_ERROR_IS_OK(err)) {
 858                 goto done;
 859         }
 860
 861         regval_ctr_delvalue(key->values, name);
 862
 863         if (!store_reg_values(key->key, key->values)) {
 864                 TALLOC_FREE(key->values);
 865                 err = WERR_REG_IO_FAILURE;
 866                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 867                 goto done;
 868         }
 869
 870         err = WERR_OK;
 871
 872 done:
 873         if (W_ERROR_IS_OK(err)) {
 874                 err = regdb_transaction_commit();
 875                 if (!W_ERROR_IS_OK(err)) {
 876                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 877                 }
 878         } else {
 879                 WERROR err1 = regdb_transaction_cancel();
 880                 if (!W_ERROR_IS_OK(err1)) {
 881                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 882                 }
 883         }
 884
 885         return err;
 886 }
 887
 888 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 889                           struct security_descriptor **psecdesc)
 890 {
 891         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 892 }
 893
 894 WERROR reg_setkeysecurity(struct registry_key *key,
 895                           struct security_descriptor *psecdesc)
 896 {
 897         return regkey_set_secdesc(key->key, psecdesc);
 898 }
 899
 900 WERROR reg_getversion(uint32_t *version)
 901 {
 902         if (version == NULL) {
 903                 return WERR_INVALID_PARAM;
 904         }
 905
 906         *version = 0x00000005; /* Windows 2000 registry API version */
 907         return WERR_OK;
 908 }
 909
 910 /**********************************************************************
 911  * Higher level utility functions
 912  **********************************************************************/
 913
 914 WERROR reg_deleteallvalues(struct registry_key *key)
 915 {
 916         WERROR err;
 917         int i;
 918
 919         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 920                 return WERR_ACCESS_DENIED;
 921         }
 922
 923         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 924                 return err;
 925         }
 926
 927         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 928                 struct regval_blob *blob;
 929                 blob = regval_ctr_specific_value(key->values, i);
 930                 regval_ctr_delvalue(key->values, regval_name(blob));
 931         }
 932
 933         if (!store_reg_values(key->key, key->values)) {
 934                 TALLOC_FREE(key->values);
 935                 return WERR_REG_IO_FAILURE;
 936         }
 937
 938         return WERR_OK;
 939 }
 940
 941 /*
 942  * Utility function to delete a registry key with all its subkeys.
 943  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 944  * key that has subkeys.
 945  */
 946 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 947                                                const char *path,
 948                                                bool del_key)
 949 {
 950         WERROR werr = WERR_OK;
 951         struct registry_key *key;
 952         char *subkey_name = NULL;
 953         uint32 i;
 954         TALLOC_CTX *mem_ctx = talloc_stackframe();
 955
 956         /* recurse through subkeys first */
 957         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 958         if (!W_ERROR_IS_OK(werr)) {
 959                 goto done;
 960         }
 961
 962         werr = fill_subkey_cache(key);
 963         W_ERROR_NOT_OK_GOTO_DONE(werr);
 964
 965         /*
 966          * loop from top to bottom for perfomance:
 967          * this way, we need to rehash the regsubkey containers less
 968          */
 969         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 970                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 971                 werr = reg_deletekey_recursive_internal(key, subkey_name, true);
 972                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 973         }
 974
 975         if (del_key) {
 976                 /* now delete the actual key */
 977                 werr = reg_deletekey(parent, path);
 978         }
 979
 980 done:
 981         TALLOC_FREE(mem_ctx);
 982         return werr;
 983 }
 984
 985 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
 986                                             const char *path,
 987                                             bool del_key)
 988 {
 989         WERROR werr;
 990
 991         werr = regdb_transaction_start();
 992         if (!W_ERROR_IS_OK(werr)) {
 993                 DEBUG(0, ("reg_deletekey_recursive_trans: "
 994                           "error starting transaction: %s\n",
 995                           win_errstr(werr)));
 996                 return werr;
 997         }
 998
 999         werr = reg_deletekey_recursive_internal(parent, path, del_key);
1000
1001         if (!W_ERROR_IS_OK(werr)) {
1002                 WERROR werr2;
1003
1004                 DEBUG(1, (__location__ " failed to delete key '%s' from key "
1005                           "'%s': %s\n", path, parent->key->name,
1006                           win_errstr(werr)));
1007
1008                 werr2 = regdb_transaction_cancel();
1009                 if (!W_ERROR_IS_OK(werr2)) {
1010                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1011                                   "error cancelling transaction: %s\n",
1012                                   win_errstr(werr2)));
1013                         /*
1014                          * return the original werr or the
1015                          * error from cancelling the transaction?
1016                          */
1017                 }
1018         } else {
1019                 werr = regdb_transaction_commit();
1020                 if (!W_ERROR_IS_OK(werr)) {
1021                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1022                                   "error committing transaction: %s\n",
1023                                   win_errstr(werr)));
1024                 }
1025         }
1026
1027         return werr;
1028 }
1029
1030 WERROR reg_deletekey_recursive(struct registry_key *parent,
1031                                const char *path)
1032 {
1033         return reg_deletekey_recursive_trans(parent, path, true);
1034 }
1035
1036 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1037                                    const char *path)
1038 {
1039         return reg_deletekey_recursive_trans(parent, path, false);
1040 }
1041