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_BADFILE;
 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
 142         DEBUG(7,("regkey_open_onelevel: name = [%s]\n", name));
 143
 144         SMB_ASSERT(strchr(name, '\\') == NULL);
 145
 146         if (!(regkey = talloc_zero(mem_ctx, struct registry_key)) ||
 147             !(regkey->token = dup_nt_token(regkey, token)) ||
 148             !(regkey->key = talloc_zero(regkey, struct registry_key_handle)))
 149         {
 150                 result = WERR_NOMEM;
 151                 goto done;
 152         }
 153
 154         result = regdb_open();
 155         if (!(W_ERROR_IS_OK(result))) {
 156                 goto done;
 157         }
 158
 159         key = regkey->key;
 160         talloc_set_destructor(key, regkey_destructor);
 161
 162         /* initialization */
 163
 164         key->type = REG_KEY_GENERIC;
 165
 166         if (name[0] == '\0') {
 167                 /*
 168                  * Open a copy of the parent key
 169                  */
 170                 if (!parent) {
 171                         result = WERR_BADFILE;
 172                         goto done;
 173                 }
 174                 key->name = talloc_strdup(key, parent->key->name);
 175         }
 176         else {
 177                 /*
 178                  * Normal subkey open
 179                  */
 180                 key->name = talloc_asprintf(key, "%s%s%s",
 181                                             parent ? parent->key->name : "",
 182                                             parent ? "\\": "",
 183                                             name);
 184         }
 185
 186         if (key->name == NULL) {
 187                 result = WERR_NOMEM;
 188                 goto done;
 189         }
 190
 191         /* Tag this as a Performance Counter Key */
 192
 193         if( strncasecmp_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         key->ops = reghook_cache_find( key->name );
 199         if (key->ops == NULL) {
 200                 DEBUG(0,("reg_open_onelevel: Failed to assign "
 201                          "registry_ops to [%s]\n", key->name ));
 202                 result = WERR_BADFILE;
 203                 goto done;
 204         }
 205
 206         /* FIXME: Existence is currently checked by fetching the subkeys */
 207
 208         result = fill_subkey_cache(regkey);
 209         if (!W_ERROR_IS_OK(result)) {
 210                 goto done;
 211         }
 212
 213         if ( !regkey_access_check( key, access_desired, &key->access_granted,
 214                                    token ) ) {
 215                 result = WERR_ACCESS_DENIED;
 216                 goto done;
 217         }
 218
 219         *pregkey = regkey;
 220         result = WERR_OK;
 221
 222 done:
 223         if ( !W_ERROR_IS_OK(result) ) {
 224                 TALLOC_FREE(regkey);
 225         }
 226
 227         return result;
 228 }
 229
 230 WERROR reg_openhive(TALLOC_CTX *mem_ctx, const char *hive,
 231                     uint32 desired_access,
 232                     const struct security_token *token,
 233                     struct registry_key **pkey)
 234 {
 235         SMB_ASSERT(hive != NULL);
 236         SMB_ASSERT(hive[0] != '\0');
 237         SMB_ASSERT(strchr(hive, '\\') == NULL);
 238
 239         return regkey_open_onelevel(mem_ctx, NULL, hive, token, desired_access,
 240                                     pkey);
 241 }
 242
 243
 244 /**********************************************************************
 245  * The API functions
 246  **********************************************************************/
 247
 248 WERROR reg_openkey(TALLOC_CTX *mem_ctx, struct registry_key *parent,
 249                    const char *name, uint32 desired_access,
 250                    struct registry_key **pkey)
 251 {
 252         struct registry_key *direct_parent = parent;
 253         WERROR err;
 254         char *p, *path;
 255         size_t len;
 256         TALLOC_CTX *frame = talloc_stackframe();
 257
 258         path = talloc_strdup(frame, name);
 259         if (path == NULL) {
 260                 err = WERR_NOMEM;
 261                 goto error;
 262         }
 263
 264         len = strlen(path);
 265
 266         if ((len > 0) && (path[len-1] == '\\')) {
 267                 path[len-1] = '\0';
 268         }
 269
 270         while ((p = strchr(path, '\\')) != NULL) {
 271                 char *name_component;
 272                 struct registry_key *tmp;
 273
 274                 name_component = talloc_strndup(frame, path, (p - path));
 275                 if (name_component == NULL) {
 276                         err = WERR_NOMEM;
 277                         goto error;
 278                 }
 279
 280                 err = regkey_open_onelevel(frame, direct_parent,
 281                                            name_component, parent->token,
 282                                            KEY_ENUMERATE_SUB_KEYS, &tmp);
 283
 284                 if (!W_ERROR_IS_OK(err)) {
 285                         goto error;
 286                 }
 287
 288                 direct_parent = tmp;
 289                 path = p+1;
 290         }
 291
 292         err = regkey_open_onelevel(mem_ctx, direct_parent, path, parent->token,
 293                                    desired_access, pkey);
 294
 295 error:
 296         talloc_free(frame);
 297         return err;
 298 }
 299
 300 WERROR reg_enumkey(TALLOC_CTX *mem_ctx, struct registry_key *key,
 301                    uint32 idx, char **name, NTTIME *last_write_time)
 302 {
 303         WERROR err;
 304
 305         if (!(key->key->access_granted & KEY_ENUMERATE_SUB_KEYS)) {
 306                 return WERR_ACCESS_DENIED;
 307         }
 308
 309         if (!W_ERROR_IS_OK(err = fill_subkey_cache(key))) {
 310                 return err;
 311         }
 312
 313         if (idx >= regsubkey_ctr_numkeys(key->subkeys)) {
 314                 return WERR_NO_MORE_ITEMS;
 315         }
 316
 317         if (!(*name = talloc_strdup(mem_ctx,
 318                         regsubkey_ctr_specific_key(key->subkeys, idx))))
 319         {
 320                 return WERR_NOMEM;
 321         }
 322
 323         if (last_write_time) {
 324                 *last_write_time = 0;
 325         }
 326
 327         return WERR_OK;
 328 }
 329
 330 WERROR reg_enumvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 331                      uint32 idx, char **pname, struct registry_value **pval)
 332 {
 333         struct registry_value *val;
 334         struct regval_blob *blob;
 335         WERROR err;
 336
 337         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 338                 return WERR_ACCESS_DENIED;
 339         }
 340
 341         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 342                 return err;
 343         }
 344
 345         if (idx >= regval_ctr_numvals(key->values)) {
 346                 return WERR_NO_MORE_ITEMS;
 347         }
 348
 349         blob = regval_ctr_specific_value(key->values, idx);
 350
 351         val = talloc_zero(mem_ctx, struct registry_value);
 352         if (val == NULL) {
 353                 return WERR_NOMEM;
 354         }
 355
 356         val->type = regval_type(blob);
 357         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 358
 359         if (pname
 360             && !(*pname = talloc_strdup(
 361                          mem_ctx, regval_name(blob)))) {
 362                 TALLOC_FREE(val);
 363                 return WERR_NOMEM;
 364         }
 365
 366         *pval = val;
 367         return WERR_OK;
 368 }
 369
 370 static WERROR reg_enumvalue_nocachefill(TALLOC_CTX *mem_ctx,
 371                                         struct registry_key *key,
 372                                         uint32 idx, char **pname,
 373                                         struct registry_value **pval)
 374 {
 375         struct registry_value *val;
 376         struct regval_blob *blob;
 377
 378         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 379                 return WERR_ACCESS_DENIED;
 380         }
 381
 382         if (idx >= regval_ctr_numvals(key->values)) {
 383                 return WERR_NO_MORE_ITEMS;
 384         }
 385
 386         blob = regval_ctr_specific_value(key->values, idx);
 387
 388         val = talloc_zero(mem_ctx, struct registry_value);
 389         if (val == NULL) {
 390                 return WERR_NOMEM;
 391         }
 392
 393         val->type = regval_type(blob);
 394         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 395
 396         if (pname
 397             && !(*pname = talloc_strdup(
 398                          mem_ctx, regval_name(blob)))) {
 399                 TALLOC_FREE(val);
 400                 return WERR_NOMEM;
 401         }
 402
 403         *pval = val;
 404         return WERR_OK;
 405 }
 406
 407 WERROR reg_queryvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 408                       const char *name, struct registry_value **pval)
 409 {
 410         WERROR err;
 411         uint32 i;
 412
 413         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 414                 return WERR_ACCESS_DENIED;
 415         }
 416
 417         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 418                 return err;
 419         }
 420
 421         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 422                 struct regval_blob *blob;
 423                 blob = regval_ctr_specific_value(key->values, i);
 424                 if (strequal(regval_name(blob), name)) {
 425                         /*
 426                          * don't use reg_enumvalue here:
 427                          * re-reading the values from the disk
 428                          * would change the indexing and break
 429                          * this function.
 430                          */
 431                         return reg_enumvalue_nocachefill(mem_ctx, key, i,
 432                                                          NULL, pval);
 433                 }
 434         }
 435
 436         return WERR_BADFILE;
 437 }
 438
 439 WERROR reg_querymultiplevalues(TALLOC_CTX *mem_ctx,
 440                                struct registry_key *key,
 441                                uint32_t num_names,
 442                                const char **names,
 443                                uint32_t *pnum_vals,
 444                                struct registry_value **pvals)
 445 {
 446         WERROR err;
 447         uint32_t i, n, found = 0;
 448         struct registry_value *vals;
 449
 450         if (num_names == 0) {
 451                 return WERR_OK;
 452         }
 453
 454         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 455                 return WERR_ACCESS_DENIED;
 456         }
 457
 458         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 459                 return err;
 460         }
 461
 462         vals = talloc_zero_array(mem_ctx, struct registry_value, num_names);
 463         if (vals == NULL) {
 464                 return WERR_NOMEM;
 465         }
 466
 467         for (n=0; n < num_names; n++) {
 468                 for (i=0; i < regval_ctr_numvals(key->values); i++) {
 469                         struct regval_blob *blob;
 470                         blob = regval_ctr_specific_value(key->values, i);
 471                         if (strequal(regval_name(blob), names[n])) {
 472                                 struct registry_value *v;
 473                                 err = reg_enumvalue(mem_ctx, key, i, NULL, &v);
 474                                 if (!W_ERROR_IS_OK(err)) {
 475                                         return err;
 476                                 }
 477                                 vals[n] = *v;
 478                                 found++;
 479                         }
 480                 }
 481         }
 482
 483         *pvals = vals;
 484         *pnum_vals = found;
 485
 486         return WERR_OK;
 487 }
 488
 489 WERROR reg_queryinfokey(struct registry_key *key, uint32_t *num_subkeys,
 490                         uint32_t *max_subkeylen, uint32_t *max_subkeysize,
 491                         uint32_t *num_values, uint32_t *max_valnamelen,
 492                         uint32_t *max_valbufsize, uint32_t *secdescsize,
 493                         NTTIME *last_changed_time)
 494 {
 495         uint32 i, max_size;
 496         size_t max_len;
 497         TALLOC_CTX *mem_ctx;
 498         WERROR err;
 499         struct security_descriptor *secdesc;
 500
 501         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 502                 return WERR_ACCESS_DENIED;
 503         }
 504
 505         if (!W_ERROR_IS_OK(fill_subkey_cache(key)) ||
 506             !W_ERROR_IS_OK(fill_value_cache(key))) {
 507                 return WERR_BADFILE;
 508         }
 509
 510         max_len = 0;
 511         for (i=0; i< regsubkey_ctr_numkeys(key->subkeys); i++) {
 512                 max_len = MAX(max_len,
 513                         strlen(regsubkey_ctr_specific_key(key->subkeys, i)));
 514         }
 515
 516         *num_subkeys = regsubkey_ctr_numkeys(key->subkeys);
 517         *max_subkeylen = max_len;
 518         *max_subkeysize = 0;    /* Class length? */
 519
 520         max_len = 0;
 521         max_size = 0;
 522         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 523                 struct regval_blob *blob;
 524                 blob = regval_ctr_specific_value(key->values, i);
 525                 max_len = MAX(max_len, strlen(regval_name(blob)));
 526                 max_size = MAX(max_size, regval_size(blob));
 527         }
 528
 529         *num_values = regval_ctr_numvals(key->values);
 530         *max_valnamelen = max_len;
 531         *max_valbufsize = max_size;
 532
 533         if (!(mem_ctx = talloc_new(key))) {
 534                 return WERR_NOMEM;
 535         }
 536
 537         err = regkey_get_secdesc(mem_ctx, key->key, &secdesc);
 538         if (!W_ERROR_IS_OK(err)) {
 539                 TALLOC_FREE(mem_ctx);
 540                 return err;
 541         }
 542
 543         *secdescsize = ndr_size_security_descriptor(secdesc, 0);
 544         TALLOC_FREE(mem_ctx);
 545
 546         *last_changed_time = 0;
 547
 548         return WERR_OK;
 549 }
 550
 551 WERROR reg_createkey(TALLOC_CTX *ctx, struct registry_key *parent,
 552                      const char *subkeypath, uint32 desired_access,
 553                      struct registry_key **pkey,
 554                      enum winreg_CreateAction *paction)
 555 {
 556         struct registry_key *key = parent;
 557         TALLOC_CTX *mem_ctx;
 558         char *path, *end;
 559         WERROR err;
 560         uint32_t access_granted;
 561
 562         mem_ctx = talloc_new(ctx);
 563         if (mem_ctx == NULL) {
 564                 return WERR_NOMEM;
 565         }
 566
 567         path = talloc_strdup(mem_ctx, subkeypath);
 568         if (path == NULL) {
 569                 err = WERR_NOMEM;
 570                 goto done;
 571         }
 572
 573         err = regdb_transaction_start();
 574         if (!W_ERROR_IS_OK(err)) {
 575                 DEBUG(0, ("reg_createkey: failed to start transaction: %s\n",
 576                           win_errstr(err)));
 577                 goto done;
 578         }
 579
 580         while ((end = strchr(path, '\\')) != NULL) {
 581                 struct registry_key *tmp;
 582                 enum winreg_CreateAction action;
 583
 584                 *end = '\0';
 585
 586                 err = reg_createkey(mem_ctx, key, path,
 587                                     KEY_ENUMERATE_SUB_KEYS, &tmp, &action);
 588                 if (!W_ERROR_IS_OK(err)) {
 589                         goto trans_done;
 590                 }
 591
 592                 if (key != parent) {
 593                         TALLOC_FREE(key);
 594                 }
 595
 596                 key = tmp;
 597                 path = end+1;
 598         }
 599
 600         /*
 601          * At this point, "path" contains the one-element subkey of "key". We
 602          * can try to open it.
 603          */
 604
 605         err = reg_openkey(ctx, key, path, desired_access, pkey);
 606         if (W_ERROR_IS_OK(err)) {
 607                 if (paction != NULL) {
 608                         *paction = REG_OPENED_EXISTING_KEY;
 609                 }
 610                 goto trans_done;
 611         }
 612
 613         if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
 614                 /*
 615                  * Something but "notfound" has happened, so bail out
 616                  */
 617                 goto trans_done;
 618         }
 619
 620         /*
 621          * We may (e.g. in the iteration) have opened the key with ENUM_SUBKEY.
 622          * Instead of re-opening the key with CREATE_SUB_KEY, we simply
 623          * duplicate the access check here and skip the expensive full open.
 624          */
 625         if (!regkey_access_check(key->key, KEY_CREATE_SUB_KEY, &access_granted,
 626                                  key->token))
 627         {
 628                 err = WERR_ACCESS_DENIED;
 629                 goto done;
 630         }
 631
 632         /*
 633          * Actually create the subkey
 634          */
 635
 636         err = create_reg_subkey(key->key, path);
 637         if (!W_ERROR_IS_OK(err)) {
 638                 goto trans_done;
 639         }
 640
 641         /*
 642          * Now open the newly created key
 643          */
 644
 645         err = reg_openkey(ctx, key, path, desired_access, pkey);
 646         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 647                 *paction = REG_CREATED_NEW_KEY;
 648         }
 649
 650 trans_done:
 651         if (W_ERROR_IS_OK(err)) {
 652                 err = regdb_transaction_commit();
 653                 if (!W_ERROR_IS_OK(err)) {
 654                         DEBUG(0, ("reg_createkey: Error committing transaction: %s\n", win_errstr(err)));
 655                 }
 656         } else {
 657                 WERROR err1 = regdb_transaction_cancel();
 658                 if (!W_ERROR_IS_OK(err1)) {
 659                         DEBUG(0, ("reg_createkey: Error cancelling transaction: %s\n", win_errstr(err1)));
 660                 }
 661         }
 662
 663  done:
 664         TALLOC_FREE(mem_ctx);
 665         return err;
 666 }
 667
 668 static WERROR reg_deletekey_internal(TALLOC_CTX *mem_ctx,
 669                                      struct registry_key *parent,
 670                                      const char *path, bool lazy)
 671 {
 672         WERROR err;
 673         char *name, *end;
 674         struct registry_key *key;
 675         name = talloc_strdup(mem_ctx, path);
 676         if (name == NULL) {
 677                 err = WERR_NOMEM;
 678                 goto done;
 679         }
 680
 681         /* no subkeys - proceed with delete */
 682         end = strrchr(name, '\\');
 683         if (end != NULL) {
 684                 *end = '\0';
 685
 686                 err = reg_openkey(mem_ctx, parent, name,
 687                                   KEY_CREATE_SUB_KEY, &key);
 688                 W_ERROR_NOT_OK_GOTO_DONE(err);
 689
 690                 parent = key;
 691                 name = end+1;
 692         }
 693
 694         if (name[0] == '\0') {
 695                 err = WERR_INVALID_PARAM;
 696                 goto done;
 697         }
 698
 699         err = delete_reg_subkey(parent->key, name, lazy);
 700
 701 done:
 702         return err;
 703 }
 704
 705 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 706 {
 707         WERROR err;
 708         struct registry_key *key;
 709         TALLOC_CTX *mem_ctx = talloc_stackframe();
 710
 711         /* check if the key has subkeys */
 712         err = reg_openkey(mem_ctx, parent, path, REG_KEY_READ, &key);
 713         W_ERROR_NOT_OK_GOTO_DONE(err);
 714
 715         err = regdb_transaction_start();
 716         if (!W_ERROR_IS_OK(err)) {
 717                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 718                           win_errstr(err)));
 719                 goto done;
 720         }
 721
 722         err = fill_subkey_cache(key);
 723         if (!W_ERROR_IS_OK(err)) {
 724                 goto trans_done;
 725         }
 726
 727         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 728                 err = WERR_ACCESS_DENIED;
 729                 goto trans_done;
 730         }
 731         err = reg_deletekey_internal(mem_ctx, parent, path, false);
 732
 733 trans_done:
 734         if (W_ERROR_IS_OK(err)) {
 735                 err = regdb_transaction_commit();
 736                 if (!W_ERROR_IS_OK(err)) {
 737                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 738                 }
 739         } else {
 740                 WERROR err1 = regdb_transaction_cancel();
 741                 if (!W_ERROR_IS_OK(err1)) {
 742                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 743                 }
 744         }
 745
 746 done:
 747         TALLOC_FREE(mem_ctx);
 748         return err;
 749 }
 750
 751
 752 WERROR reg_setvalue(struct registry_key *key, const char *name,
 753                     const struct registry_value *val)
 754 {
 755         struct regval_blob *existing;
 756         WERROR err;
 757         int res;
 758
 759         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 760                 return WERR_ACCESS_DENIED;
 761         }
 762
 763         err = regdb_transaction_start();
 764         if (!W_ERROR_IS_OK(err)) {
 765                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 766                           win_errstr(err)));
 767                 return err;
 768         }
 769
 770         err = fill_value_cache(key);
 771         if (!W_ERROR_IS_OK(err)) {
 772                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 773                 goto done;
 774         }
 775
 776         existing = regval_ctr_getvalue(key->values, name);
 777
 778         if ((existing != NULL) &&
 779             (regval_size(existing) == val->data.length) &&
 780             (memcmp(regval_data_p(existing), val->data.data,
 781                     val->data.length) == 0))
 782         {
 783                 err = WERR_OK;
 784                 goto done;
 785         }
 786
 787         res = regval_ctr_addvalue(key->values, name, val->type,
 788                                   val->data.data, val->data.length);
 789
 790         if (res == 0) {
 791                 TALLOC_FREE(key->values);
 792                 err = WERR_NOMEM;
 793                 goto done;
 794         }
 795
 796         if (!store_reg_values(key->key, key->values)) {
 797                 TALLOC_FREE(key->values);
 798                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 799                 err = WERR_REG_IO_FAILURE;
 800                 goto done;
 801         }
 802
 803         err = WERR_OK;
 804
 805 done:
 806         if (W_ERROR_IS_OK(err)) {
 807                 err = regdb_transaction_commit();
 808                 if (!W_ERROR_IS_OK(err)) {
 809                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 810                 }
 811         } else {
 812                 WERROR err1 = regdb_transaction_cancel();
 813                 if (!W_ERROR_IS_OK(err1)) {
 814                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 815                 }
 816         }
 817
 818         return err;
 819 }
 820
 821 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 822 {
 823         struct regval_blob *blob;
 824
 825         blob = regval_ctr_getvalue(key->values, name);
 826
 827         if (blob == NULL) {
 828                 return WERR_BADFILE;
 829         } else {
 830                 return WERR_OK;
 831         }
 832 }
 833
 834 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 835 {
 836         WERROR err;
 837
 838         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 839                 return WERR_ACCESS_DENIED;
 840         }
 841
 842         err = regdb_transaction_start();
 843         if (!W_ERROR_IS_OK(err)) {
 844                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 845                           win_errstr(err)));
 846                 return err;
 847         }
 848
 849         err = fill_value_cache(key);
 850         if (!W_ERROR_IS_OK(err)) {
 851                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 852                           win_errstr(err)));
 853                 goto done;
 854         }
 855
 856         err = reg_value_exists(key, name);
 857         if (!W_ERROR_IS_OK(err)) {
 858                 goto done;
 859         }
 860
 861         regval_ctr_delvalue(key->values, name);
 862
 863         if (!store_reg_values(key->key, key->values)) {
 864                 TALLOC_FREE(key->values);
 865                 err = WERR_REG_IO_FAILURE;
 866                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 867                 goto done;
 868         }
 869
 870         err = WERR_OK;
 871
 872 done:
 873         if (W_ERROR_IS_OK(err)) {
 874                 err = regdb_transaction_commit();
 875                 if (!W_ERROR_IS_OK(err)) {
 876                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 877                 }
 878         } else {
 879                 WERROR err1 = regdb_transaction_cancel();
 880                 if (!W_ERROR_IS_OK(err1)) {
 881                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 882                 }
 883         }
 884
 885         return err;
 886 }
 887
 888 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 889                           struct security_descriptor **psecdesc)
 890 {
 891         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 892 }
 893
 894 WERROR reg_setkeysecurity(struct registry_key *key,
 895                           struct security_descriptor *psecdesc)
 896 {
 897         return regkey_set_secdesc(key->key, psecdesc);
 898 }
 899
 900 WERROR reg_getversion(uint32_t *version)
 901 {
 902         if (version == NULL) {
 903                 return WERR_INVALID_PARAM;
 904         }
 905
 906         *version = 0x00000005; /* Windows 2000 registry API version */
 907         return WERR_OK;
 908 }
 909
 910 /**********************************************************************
 911  * Higher level utility functions
 912  **********************************************************************/
 913
 914 WERROR reg_deleteallvalues(struct registry_key *key)
 915 {
 916         WERROR err;
 917         int i;
 918
 919         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 920                 return WERR_ACCESS_DENIED;
 921         }
 922
 923         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 924                 return err;
 925         }
 926
 927         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 928                 struct regval_blob *blob;
 929                 blob = regval_ctr_specific_value(key->values, i);
 930                 regval_ctr_delvalue(key->values, regval_name(blob));
 931         }
 932
 933         if (!store_reg_values(key->key, key->values)) {
 934                 TALLOC_FREE(key->values);
 935                 return WERR_REG_IO_FAILURE;
 936         }
 937
 938         return WERR_OK;
 939 }
 940
 941 /*
 942  * Utility function to delete a registry key with all its subkeys.
 943  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 944  * key that has subkeys.
 945  */
 946 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 947                                                const char *path,
 948                                                bool del_key, bool lazy)
 949 {
 950         WERROR werr = WERR_OK;
 951         struct registry_key *key;
 952         char *subkey_name = NULL;
 953         uint32 i;
 954         TALLOC_CTX *mem_ctx = talloc_stackframe();
 955
 956         DEBUG(5, ("reg_deletekey_recursive_internal: deleting '%s' from '%s'\n",
 957                   path, parent->key->name));
 958
 959         /* recurse through subkeys first */
 960         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 961         if (!W_ERROR_IS_OK(werr)) {
 962                 DEBUG(3, ("reg_deletekey_recursive_internal: error opening "
 963                           "subkey '%s' of '%s': '%s'\n",
 964                           path, parent->key->name, win_errstr(werr)));
 965                 goto done;
 966         }
 967
 968         werr = fill_subkey_cache(key);
 969         W_ERROR_NOT_OK_GOTO_DONE(werr);
 970
 971         /*
 972          * loop from top to bottom for perfomance:
 973          * this way, we need to rehash the regsubkey containers less
 974          */
 975         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 976                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 977                 werr = reg_deletekey_recursive_internal(key, subkey_name, true, del_key);
 978                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 979         }
 980
 981         if (del_key) {
 982                 /* now delete the actual key */
 983                 werr = reg_deletekey_internal(mem_ctx, parent, path, lazy);
 984         }
 985
 986 done:
 987
 988         DEBUG(5, ("reg_deletekey_recursive_internal: done deleting '%s' from "
 989                   "'%s': %s\n",
 990                   path, parent->key->name, win_errstr(werr)));
 991         TALLOC_FREE(mem_ctx);
 992         return werr;
 993 }
 994
 995 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
 996                                             const char *path,
 997                                             bool del_key)
 998 {
 999         WERROR werr;
1000
1001         werr = regdb_transaction_start();
1002         if (!W_ERROR_IS_OK(werr)) {
1003                 DEBUG(0, ("reg_deletekey_recursive_trans: "
1004                           "error starting transaction: %s\n",
1005                           win_errstr(werr)));
1006                 return werr;
1007         }
1008
1009         werr = reg_deletekey_recursive_internal(parent, path, del_key, false);
1010
1011         if (!W_ERROR_IS_OK(werr)) {
1012                 WERROR werr2;
1013
1014                 DEBUG(1, (__location__ " failed to delete key '%s' from key "
1015                           "'%s': %s\n", path, parent->key->name,
1016                           win_errstr(werr)));
1017
1018                 werr2 = regdb_transaction_cancel();
1019                 if (!W_ERROR_IS_OK(werr2)) {
1020                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1021                                   "error cancelling transaction: %s\n",
1022                                   win_errstr(werr2)));
1023                         /*
1024                          * return the original werr or the
1025                          * error from cancelling the transaction?
1026                          */
1027                 }
1028         } else {
1029                 werr = regdb_transaction_commit();
1030                 if (!W_ERROR_IS_OK(werr)) {
1031                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1032                                   "error committing transaction: %s\n",
1033                                   win_errstr(werr)));
1034                 } else {
1035                         DEBUG(5, ("reg_reletekey_recursive_trans: deleted key '%s' from '%s'\n",
1036                                   path, parent->key->name));
1037
1038                 }
1039         }
1040
1041         return werr;
1042 }
1043
1044 WERROR reg_deletekey_recursive(struct registry_key *parent,
1045                                const char *path)
1046 {
1047         return reg_deletekey_recursive_trans(parent, path, true);
1048 }
1049
1050 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1051                                    const char *path)
1052 {
1053         return reg_deletekey_recursive_trans(parent, path, false);
1054 }
1055