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