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         if (!(mem_ctx = talloc_new(ctx))) return WERR_NOMEM;
 572
 573         if (!(path = talloc_strdup(mem_ctx, subkeypath))) {
 574                 err = WERR_NOMEM;
 575                 goto done;
 576         }
 577
 578         while ((end = strchr(path, '\\')) != NULL) {
 579                 struct registry_key *tmp;
 580                 enum winreg_CreateAction action;
 581
 582                 *end = '\0';
 583
 584                 err = reg_createkey(mem_ctx, key, path,
 585                                     KEY_ENUMERATE_SUB_KEYS, &tmp, &action);
 586                 if (!W_ERROR_IS_OK(err)) {
 587                         goto done;
 588                 }
 589
 590                 if (key != parent) {
 591                         TALLOC_FREE(key);
 592                 }
 593
 594                 key = tmp;
 595                 path = end+1;
 596         }
 597
 598         /*
 599          * At this point, "path" contains the one-element subkey of "key". We
 600          * can try to open it.
 601          */
 602
 603         err = reg_openkey(ctx, key, path, desired_access, pkey);
 604         if (W_ERROR_IS_OK(err)) {
 605                 if (paction != NULL) {
 606                         *paction = REG_OPENED_EXISTING_KEY;
 607                 }
 608                 goto done;
 609         }
 610
 611         if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
 612                 /*
 613                  * Something but "notfound" has happened, so bail out
 614                  */
 615                 goto done;
 616         }
 617
 618         /*
 619          * We have to make a copy of the current key, as we opened it only
 620          * with ENUM_SUBKEY access.
 621          */
 622
 623         err = reg_openkey(mem_ctx, key, "", KEY_CREATE_SUB_KEY,
 624                           &create_parent);
 625         if (!W_ERROR_IS_OK(err)) {
 626                 goto done;
 627         }
 628
 629         /*
 630          * Actually create the subkey
 631          */
 632
 633         err = fill_subkey_cache(create_parent);
 634         if (!W_ERROR_IS_OK(err)) goto done;
 635
 636         err = create_reg_subkey(key->key, path);
 637         W_ERROR_NOT_OK_GOTO_DONE(err);
 638
 639         /*
 640          * Now open the newly created key
 641          */
 642
 643         err = reg_openkey(ctx, create_parent, path, desired_access, pkey);
 644         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 645                 *paction = REG_CREATED_NEW_KEY;
 646         }
 647
 648  done:
 649         TALLOC_FREE(mem_ctx);
 650         return err;
 651 }
 652
 653 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 654 {
 655         WERROR err;
 656         char *name, *end;
 657         struct registry_key *tmp_key, *key;
 658         TALLOC_CTX *mem_ctx = talloc_stackframe();
 659
 660         name = talloc_strdup(mem_ctx, path);
 661         if (name == NULL) {
 662                 err = WERR_NOMEM;
 663                 goto done;
 664         }
 665
 666         /* check if the key has subkeys */
 667         err = reg_openkey(mem_ctx, parent, name, REG_KEY_READ, &key);
 668         W_ERROR_NOT_OK_GOTO_DONE(err);
 669
 670         err = fill_subkey_cache(key);
 671         W_ERROR_NOT_OK_GOTO_DONE(err);
 672
 673         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 674                 err = WERR_ACCESS_DENIED;
 675                 goto done;
 676         }
 677
 678         /* no subkeys - proceed with delete */
 679         end = strrchr(name, '\\');
 680         if (end != NULL) {
 681                 *end = '\0';
 682
 683                 err = reg_openkey(mem_ctx, parent, name,
 684                                   KEY_CREATE_SUB_KEY, &tmp_key);
 685                 W_ERROR_NOT_OK_GOTO_DONE(err);
 686
 687                 parent = tmp_key;
 688                 name = end+1;
 689         }
 690
 691         if (name[0] == '\0') {
 692                 err = WERR_INVALID_PARAM;
 693                 goto done;
 694         }
 695
 696         err = delete_reg_subkey(parent->key, name);
 697
 698 done:
 699         TALLOC_FREE(mem_ctx);
 700         return err;
 701 }
 702
 703 WERROR reg_setvalue(struct registry_key *key, const char *name,
 704                     const struct registry_value *val)
 705 {
 706         struct regval_blob *existing;
 707         WERROR err;
 708         int res;
 709
 710         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 711                 return WERR_ACCESS_DENIED;
 712         }
 713
 714         err = fill_value_cache(key);
 715         if (!W_ERROR_IS_OK(err)) {
 716                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 717                 return err;
 718         }
 719
 720         existing = regval_ctr_getvalue(key->values, name);
 721
 722         if ((existing != NULL) &&
 723             (regval_size(existing) == val->data.length) &&
 724             (memcmp(regval_data_p(existing), val->data.data,
 725                     val->data.length) == 0)) {
 726                 return WERR_OK;
 727         }
 728
 729         res = regval_ctr_addvalue(key->values, name, val->type,
 730                                   val->data.data, val->data.length);
 731
 732         if (res == 0) {
 733                 TALLOC_FREE(key->values);
 734                 return WERR_NOMEM;
 735         }
 736
 737         if (!store_reg_values(key->key, key->values)) {
 738                 TALLOC_FREE(key->values);
 739                 return WERR_REG_IO_FAILURE;
 740         }
 741
 742         return WERR_OK;
 743 }
 744
 745 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 746 {
 747         struct regval_blob *blob;
 748
 749         blob = regval_ctr_getvalue(key->values, name);
 750
 751         if (blob == NULL) {
 752                 return WERR_BADFILE;
 753         } else {
 754                 return WERR_OK;
 755         }
 756 }
 757
 758 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 759 {
 760         WERROR err;
 761
 762         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 763                 return WERR_ACCESS_DENIED;
 764         }
 765
 766         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 767                 return err;
 768         }
 769
 770         err = reg_value_exists(key, name);
 771         if (!W_ERROR_IS_OK(err)) {
 772                 return err;
 773         }
 774
 775         regval_ctr_delvalue(key->values, name);
 776
 777         if (!store_reg_values(key->key, key->values)) {
 778                 TALLOC_FREE(key->values);
 779                 return WERR_REG_IO_FAILURE;
 780         }
 781
 782         return WERR_OK;
 783 }
 784
 785 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 786                           struct security_descriptor **psecdesc)
 787 {
 788         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 789 }
 790
 791 WERROR reg_setkeysecurity(struct registry_key *key,
 792                           struct security_descriptor *psecdesc)
 793 {
 794         return regkey_set_secdesc(key->key, psecdesc);
 795 }
 796
 797 WERROR reg_getversion(uint32_t *version)
 798 {
 799         if (version == NULL) {
 800                 return WERR_INVALID_PARAM;
 801         }
 802
 803         *version = 0x00000005; /* Windows 2000 registry API version */
 804         return WERR_OK;
 805 }
 806
 807 /**********************************************************************
 808  * Higher level utility functions
 809  **********************************************************************/
 810
 811 WERROR reg_deleteallvalues(struct registry_key *key)
 812 {
 813         WERROR err;
 814         int i;
 815
 816         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 817                 return WERR_ACCESS_DENIED;
 818         }
 819
 820         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 821                 return err;
 822         }
 823
 824         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 825                 struct regval_blob *blob;
 826                 blob = regval_ctr_specific_value(key->values, i);
 827                 regval_ctr_delvalue(key->values, regval_name(blob));
 828         }
 829
 830         if (!store_reg_values(key->key, key->values)) {
 831                 TALLOC_FREE(key->values);
 832                 return WERR_REG_IO_FAILURE;
 833         }
 834
 835         return WERR_OK;
 836 }
 837
 838 /*
 839  * Utility function to delete a registry key with all its subkeys.
 840  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 841  * key that has subkeys.
 842  */
 843 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 844                                                const char *path,
 845                                                bool del_key)
 846 {
 847         WERROR werr = WERR_OK;
 848         struct registry_key *key;
 849         char *subkey_name = NULL;
 850         uint32 i;
 851         TALLOC_CTX *mem_ctx = talloc_stackframe();
 852
 853         /* recurse through subkeys first */
 854         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 855         if (!W_ERROR_IS_OK(werr)) {
 856                 goto done;
 857         }
 858
 859         werr = fill_subkey_cache(key);
 860         W_ERROR_NOT_OK_GOTO_DONE(werr);
 861
 862         /*
 863          * loop from top to bottom for perfomance:
 864          * this way, we need to rehash the regsubkey containers less
 865          */
 866         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 867                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 868                 werr = reg_deletekey_recursive_internal(key, subkey_name, true);
 869                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 870         }
 871
 872         if (del_key) {
 873                 /* now delete the actual key */
 874                 werr = reg_deletekey(parent, path);
 875         }
 876
 877 done:
 878         TALLOC_FREE(mem_ctx);
 879         return werr;
 880 }
 881
 882 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
 883                                             const char *path,
 884                                             bool del_key)
 885 {
 886         WERROR werr;
 887
 888         werr = regdb_transaction_start();
 889         if (!W_ERROR_IS_OK(werr)) {
 890                 DEBUG(0, ("reg_deletekey_recursive_trans: "
 891                           "error starting transaction: %s\n",
 892                           win_errstr(werr)));
 893                 return werr;
 894         }
 895
 896         werr = reg_deletekey_recursive_internal(parent, path, del_key);
 897
 898         if (!W_ERROR_IS_OK(werr)) {
 899                 WERROR werr2;
 900
 901                 DEBUG(1, (__location__ " failed to delete key '%s' from key "
 902                           "'%s': %s\n", path, parent->key->name,
 903                           win_errstr(werr)));
 904
 905                 werr2 = regdb_transaction_cancel();
 906                 if (!W_ERROR_IS_OK(werr2)) {
 907                         DEBUG(0, ("reg_deletekey_recursive_trans: "
 908                                   "error cancelling transaction: %s\n",
 909                                   win_errstr(werr2)));
 910                         /*
 911                          * return the original werr or the
 912                          * error from cancelling the transaction?
 913                          */
 914                 }
 915         } else {
 916                 werr = regdb_transaction_commit();
 917                 if (!W_ERROR_IS_OK(werr)) {
 918                         DEBUG(0, ("reg_deletekey_recursive_trans: "
 919                                   "error committing transaction: %s\n",
 920                                   win_errstr(werr)));
 921                 }
 922         }
 923
 924         return werr;
 925 }
 926
 927 WERROR reg_deletekey_recursive(struct registry_key *parent,
 928                                const char *path)
 929 {
 930         return reg_deletekey_recursive_trans(parent, path, true);
 931 }
 932
 933 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
 934                                    const char *path)
 935 {
 936         return reg_deletekey_recursive_trans(parent, path, false);
 937 }
 938