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         TALLOC_FREE(key->subkeys);
 115         werr = regsubkey_ctr_init(key, &(key->subkeys));
 116         W_ERROR_NOT_OK_RETURN(werr);
 117
 118         if (fetch_reg_keys(key->key, key->subkeys) == -1) {
 119                 TALLOC_FREE(key->subkeys);
 120                 return WERR_NO_MORE_ITEMS;
 121         }
 122
 123         return WERR_OK;
 124 }
 125
 126 static int regkey_destructor(struct registry_key_handle *key)
 127 {
 128         return regdb_close();
 129 }
 130
 131 static WERROR regkey_open_onelevel(TALLOC_CTX *mem_ctx,
 132                                    struct registry_key *parent,
 133                                    const char *name,
 134                                    const struct security_token *token,
 135                                    uint32 access_desired,
 136                                    struct registry_key **pregkey)
 137 {
 138         WERROR          result = WERR_OK;
 139         struct registry_key *regkey;
 140         struct registry_key_handle *key;
 141         struct regsubkey_ctr    *subkeys = NULL;
 142
 143         DEBUG(7,("regkey_open_onelevel: name = [%s]\n", name));
 144
 145         SMB_ASSERT(strchr(name, '\\') == NULL);
 146
 147         if (!(regkey = talloc_zero(mem_ctx, struct registry_key)) ||
 148             !(regkey->token = dup_nt_token(regkey, token)) ||
 149             !(regkey->key = talloc_zero(regkey, struct registry_key_handle)))
 150         {
 151                 result = WERR_NOMEM;
 152                 goto done;
 153         }
 154
 155         if ( !(W_ERROR_IS_OK(result = regdb_open())) ) {
 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_m(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         if (!(mem_ctx = talloc_new(ctx))) return WERR_NOMEM;
 573
 574         if (!(path = talloc_strdup(mem_ctx, subkeypath))) {
 575                 err = WERR_NOMEM;
 576                 goto done;
 577         }
 578
 579         while ((end = strchr(path, '\\')) != NULL) {
 580                 struct registry_key *tmp;
 581                 enum winreg_CreateAction action;
 582
 583                 *end = '\0';
 584
 585                 err = reg_createkey(mem_ctx, key, path,
 586                                     KEY_ENUMERATE_SUB_KEYS, &tmp, &action);
 587                 if (!W_ERROR_IS_OK(err)) {
 588                         goto done;
 589                 }
 590
 591                 if (key != parent) {
 592                         TALLOC_FREE(key);
 593                 }
 594
 595                 key = tmp;
 596                 path = end+1;
 597         }
 598
 599         /*
 600          * At this point, "path" contains the one-element subkey of "key". We
 601          * can try to open it.
 602          */
 603
 604         err = reg_openkey(ctx, key, path, desired_access, pkey);
 605         if (W_ERROR_IS_OK(err)) {
 606                 if (paction != NULL) {
 607                         *paction = REG_OPENED_EXISTING_KEY;
 608                 }
 609                 goto done;
 610         }
 611
 612         if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
 613                 /*
 614                  * Something but "notfound" has happened, so bail out
 615                  */
 616                 goto done;
 617         }
 618
 619         /*
 620          * We have to make a copy of the current key, as we opened it only
 621          * with ENUM_SUBKEY access.
 622          */
 623
 624         err = reg_openkey(mem_ctx, key, "", KEY_CREATE_SUB_KEY,
 625                           &create_parent);
 626         if (!W_ERROR_IS_OK(err)) {
 627                 goto done;
 628         }
 629
 630         /*
 631          * Actually create the subkey
 632          */
 633
 634         err = fill_subkey_cache(create_parent);
 635         if (!W_ERROR_IS_OK(err)) goto done;
 636
 637         err = create_reg_subkey(key->key, path);
 638         W_ERROR_NOT_OK_GOTO_DONE(err);
 639
 640         /*
 641          * Now open the newly created key
 642          */
 643
 644         err = reg_openkey(ctx, create_parent, path, desired_access, pkey);
 645         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 646                 *paction = REG_CREATED_NEW_KEY;
 647         }
 648
 649  done:
 650         TALLOC_FREE(mem_ctx);
 651         return err;
 652 }
 653
 654 static WERROR reg_deletekey_internal(TALLOC_CTX *mem_ctx,
 655                                      struct registry_key *parent,
 656                                      const char *path, bool lazy)
 657 {
 658         WERROR err;
 659         char *name, *end;
 660         struct registry_key *key;
 661         name = talloc_strdup(mem_ctx, path);
 662         if (name == NULL) {
 663                 err = WERR_NOMEM;
 664                 goto done;
 665         }
 666
 667         /* no subkeys - proceed with delete */
 668         end = strrchr(name, '\\');
 669         if (end != NULL) {
 670                 *end = '\0';
 671
 672                 err = reg_openkey(mem_ctx, parent, name,
 673                                   KEY_CREATE_SUB_KEY, &key);
 674                 W_ERROR_NOT_OK_GOTO_DONE(err);
 675
 676                 parent = key;
 677                 name = end+1;
 678         }
 679
 680         if (name[0] == '\0') {
 681                 err = WERR_INVALID_PARAM;
 682                 goto done;
 683         }
 684
 685         err = delete_reg_subkey(parent->key, name, lazy);
 686
 687 done:
 688         return err;
 689 }
 690
 691 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 692 {
 693         WERROR err;
 694         struct registry_key *key;
 695         TALLOC_CTX *mem_ctx = talloc_stackframe();
 696
 697         /* check if the key has subkeys */
 698         err = reg_openkey(mem_ctx, parent, path, REG_KEY_READ, &key);
 699         W_ERROR_NOT_OK_GOTO_DONE(err);
 700
 701         err = fill_subkey_cache(key);
 702         W_ERROR_NOT_OK_GOTO_DONE(err);
 703
 704         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 705                 err = WERR_ACCESS_DENIED;
 706                 goto done;
 707         }
 708         err = reg_deletekey_internal(mem_ctx, parent, path, false);
 709 done:
 710         TALLOC_FREE(mem_ctx);
 711         return err;
 712 }
 713
 714
 715 WERROR reg_setvalue(struct registry_key *key, const char *name,
 716                     const struct registry_value *val)
 717 {
 718         struct regval_blob *existing;
 719         WERROR err;
 720         int res;
 721
 722         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 723                 return WERR_ACCESS_DENIED;
 724         }
 725
 726         err = regdb_transaction_start();
 727         if (!W_ERROR_IS_OK(err)) {
 728                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 729                           win_errstr(err)));
 730                 return err;
 731         }
 732
 733         err = fill_value_cache(key);
 734         if (!W_ERROR_IS_OK(err)) {
 735                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 736                 goto done;
 737         }
 738
 739         existing = regval_ctr_getvalue(key->values, name);
 740
 741         if ((existing != NULL) &&
 742             (regval_size(existing) == val->data.length) &&
 743             (memcmp(regval_data_p(existing), val->data.data,
 744                     val->data.length) == 0))
 745         {
 746                 err = WERR_OK;
 747                 goto done;
 748         }
 749
 750         res = regval_ctr_addvalue(key->values, name, val->type,
 751                                   val->data.data, val->data.length);
 752
 753         if (res == 0) {
 754                 TALLOC_FREE(key->values);
 755                 err = WERR_NOMEM;
 756                 goto done;
 757         }
 758
 759         if (!store_reg_values(key->key, key->values)) {
 760                 TALLOC_FREE(key->values);
 761                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 762                 err = WERR_REG_IO_FAILURE;
 763                 goto done;
 764         }
 765
 766         err = WERR_OK;
 767
 768 done:
 769         if (W_ERROR_IS_OK(err)) {
 770                 err = regdb_transaction_commit();
 771                 if (!W_ERROR_IS_OK(err)) {
 772                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 773                 }
 774         } else {
 775                 WERROR err1 = regdb_transaction_cancel();
 776                 if (!W_ERROR_IS_OK(err1)) {
 777                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 778                 }
 779         }
 780
 781         return err;
 782 }
 783
 784 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 785 {
 786         struct regval_blob *blob;
 787
 788         blob = regval_ctr_getvalue(key->values, name);
 789
 790         if (blob == NULL) {
 791                 return WERR_BADFILE;
 792         } else {
 793                 return WERR_OK;
 794         }
 795 }
 796
 797 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 798 {
 799         WERROR err;
 800
 801         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 802                 return WERR_ACCESS_DENIED;
 803         }
 804
 805         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 806                 return err;
 807         }
 808
 809         err = reg_value_exists(key, name);
 810         if (!W_ERROR_IS_OK(err)) {
 811                 return err;
 812         }
 813
 814         regval_ctr_delvalue(key->values, name);
 815
 816         if (!store_reg_values(key->key, key->values)) {
 817                 TALLOC_FREE(key->values);
 818                 return WERR_REG_IO_FAILURE;
 819         }
 820
 821         return WERR_OK;
 822 }
 823
 824 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 825                           struct security_descriptor **psecdesc)
 826 {
 827         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 828 }
 829
 830 WERROR reg_setkeysecurity(struct registry_key *key,
 831                           struct security_descriptor *psecdesc)
 832 {
 833         return regkey_set_secdesc(key->key, psecdesc);
 834 }
 835
 836 WERROR reg_getversion(uint32_t *version)
 837 {
 838         if (version == NULL) {
 839                 return WERR_INVALID_PARAM;
 840         }
 841
 842         *version = 0x00000005; /* Windows 2000 registry API version */
 843         return WERR_OK;
 844 }
 845
 846 /**********************************************************************
 847  * Higher level utility functions
 848  **********************************************************************/
 849
 850 WERROR reg_deleteallvalues(struct registry_key *key)
 851 {
 852         WERROR err;
 853         int i;
 854
 855         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 856                 return WERR_ACCESS_DENIED;
 857         }
 858
 859         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 860                 return err;
 861         }
 862
 863         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 864                 struct regval_blob *blob;
 865                 blob = regval_ctr_specific_value(key->values, i);
 866                 regval_ctr_delvalue(key->values, regval_name(blob));
 867         }
 868
 869         if (!store_reg_values(key->key, key->values)) {
 870                 TALLOC_FREE(key->values);
 871                 return WERR_REG_IO_FAILURE;
 872         }
 873
 874         return WERR_OK;
 875 }
 876
 877 /*
 878  * Utility function to delete a registry key with all its subkeys.
 879  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 880  * key that has subkeys.
 881  */
 882 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 883                                                const char *path,
 884                                                bool del_key, bool lazy)
 885 {
 886         WERROR werr = WERR_OK;
 887         struct registry_key *key;
 888         char *subkey_name = NULL;
 889         uint32 i;
 890         TALLOC_CTX *mem_ctx = talloc_stackframe();
 891
 892         DEBUG(5, ("reg_deletekey_recursive_internal: deleting '%s' from '%s'\n",
 893                   path, parent->key->name));
 894
 895         /* recurse through subkeys first */
 896         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 897         if (!W_ERROR_IS_OK(werr)) {
 898                 DEBUG(3, ("reg_deletekey_recursive_internal: error opening "
 899                           "subkey '%s' of '%s': '%s'\n",
 900                           path, parent->key->name, win_errstr(werr)));
 901                 goto done;
 902         }
 903
 904         werr = fill_subkey_cache(key);
 905         W_ERROR_NOT_OK_GOTO_DONE(werr);
 906
 907         /*
 908          * loop from top to bottom for perfomance:
 909          * this way, we need to rehash the regsubkey containers less
 910          */
 911         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 912                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 913                 werr = reg_deletekey_recursive_internal(key, subkey_name, true, del_key);
 914                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 915         }
 916
 917         if (del_key) {
 918                 /* now delete the actual key */
 919                 werr = reg_deletekey_internal(mem_ctx, parent, path, lazy);
 920         }
 921
 922 done:
 923
 924         DEBUG(5, ("reg_deletekey_recursive_internal: done deleting '%s' from "
 925                   "'%s': %s\n",
 926                   path, parent->key->name, win_errstr(werr)));
 927         TALLOC_FREE(mem_ctx);
 928         return werr;
 929 }
 930
 931 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
 932                                             const char *path,
 933                                             bool del_key)
 934 {
 935         WERROR werr;
 936
 937         werr = regdb_transaction_start();
 938         if (!W_ERROR_IS_OK(werr)) {
 939                 DEBUG(0, ("reg_deletekey_recursive_trans: "
 940                           "error starting transaction: %s\n",
 941                           win_errstr(werr)));
 942                 return werr;
 943         }
 944
 945         werr = reg_deletekey_recursive_internal(parent, path, del_key, false);
 946
 947         if (!W_ERROR_IS_OK(werr)) {
 948                 WERROR werr2;
 949
 950                 DEBUG(1, (__location__ " failed to delete key '%s' from key "
 951                           "'%s': %s\n", path, parent->key->name,
 952                           win_errstr(werr)));
 953
 954                 werr2 = regdb_transaction_cancel();
 955                 if (!W_ERROR_IS_OK(werr2)) {
 956                         DEBUG(0, ("reg_deletekey_recursive_trans: "
 957                                   "error cancelling transaction: %s\n",
 958                                   win_errstr(werr2)));
 959                         /*
 960                          * return the original werr or the
 961                          * error from cancelling the transaction?
 962                          */
 963                 }
 964         } else {
 965                 werr = regdb_transaction_commit();
 966                 if (!W_ERROR_IS_OK(werr)) {
 967                         DEBUG(0, ("reg_deletekey_recursive_trans: "
 968                                   "error committing transaction: %s\n",
 969                                   win_errstr(werr)));
 970                 } else {
 971                         DEBUG(5, ("reg_reletekey_recursive_trans: deleted key '%s' from '%s'\n",
 972                                   path, parent->key->name));
 973
 974                 }
 975         }
 976
 977         return werr;
 978 }
 979
 980 WERROR reg_deletekey_recursive(struct registry_key *parent,
 981                                const char *path)
 982 {
 983         return reg_deletekey_recursive_trans(parent, path, true);
 984 }
 985
 986 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
 987                                    const char *path)
 988 {
 989         return reg_deletekey_recursive_trans(parent, path, false);
 990 }
 991