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         err = fill_subkey_cache(key);
 310         if (!W_ERROR_IS_OK(err)) {
 311                 return err;
 312         }
 313
 314         if (idx >= regsubkey_ctr_numkeys(key->subkeys)) {
 315                 return WERR_NO_MORE_ITEMS;
 316         }
 317
 318         if (!(*name = talloc_strdup(mem_ctx,
 319                         regsubkey_ctr_specific_key(key->subkeys, idx))))
 320         {
 321                 return WERR_NOMEM;
 322         }
 323
 324         if (last_write_time) {
 325                 *last_write_time = 0;
 326         }
 327
 328         return WERR_OK;
 329 }
 330
 331 WERROR reg_enumvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 332                      uint32 idx, char **pname, struct registry_value **pval)
 333 {
 334         struct registry_value *val;
 335         struct regval_blob *blob;
 336         WERROR err;
 337
 338         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 339                 return WERR_ACCESS_DENIED;
 340         }
 341
 342         err = fill_value_cache(key);
 343         if (!(W_ERROR_IS_OK(err))) {
 344                 return err;
 345         }
 346
 347         if (idx >= regval_ctr_numvals(key->values)) {
 348                 return WERR_NO_MORE_ITEMS;
 349         }
 350
 351         blob = regval_ctr_specific_value(key->values, idx);
 352
 353         val = talloc_zero(mem_ctx, struct registry_value);
 354         if (val == NULL) {
 355                 return WERR_NOMEM;
 356         }
 357
 358         val->type = regval_type(blob);
 359         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 360
 361         if (pname
 362             && !(*pname = talloc_strdup(
 363                          mem_ctx, regval_name(blob)))) {
 364                 TALLOC_FREE(val);
 365                 return WERR_NOMEM;
 366         }
 367
 368         *pval = val;
 369         return WERR_OK;
 370 }
 371
 372 static WERROR reg_enumvalue_nocachefill(TALLOC_CTX *mem_ctx,
 373                                         struct registry_key *key,
 374                                         uint32 idx, char **pname,
 375                                         struct registry_value **pval)
 376 {
 377         struct registry_value *val;
 378         struct regval_blob *blob;
 379
 380         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 381                 return WERR_ACCESS_DENIED;
 382         }
 383
 384         if (idx >= regval_ctr_numvals(key->values)) {
 385                 return WERR_NO_MORE_ITEMS;
 386         }
 387
 388         blob = regval_ctr_specific_value(key->values, idx);
 389
 390         val = talloc_zero(mem_ctx, struct registry_value);
 391         if (val == NULL) {
 392                 return WERR_NOMEM;
 393         }
 394
 395         val->type = regval_type(blob);
 396         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 397
 398         if (pname
 399             && !(*pname = talloc_strdup(
 400                          mem_ctx, regval_name(blob)))) {
 401                 TALLOC_FREE(val);
 402                 return WERR_NOMEM;
 403         }
 404
 405         *pval = val;
 406         return WERR_OK;
 407 }
 408
 409 WERROR reg_queryvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 410                       const char *name, struct registry_value **pval)
 411 {
 412         WERROR err;
 413         uint32 i;
 414
 415         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 416                 return WERR_ACCESS_DENIED;
 417         }
 418
 419         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 420                 return err;
 421         }
 422
 423         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 424                 struct regval_blob *blob;
 425                 blob = regval_ctr_specific_value(key->values, i);
 426                 if (strequal(regval_name(blob), name)) {
 427                         /*
 428                          * don't use reg_enumvalue here:
 429                          * re-reading the values from the disk
 430                          * would change the indexing and break
 431                          * this function.
 432                          */
 433                         return reg_enumvalue_nocachefill(mem_ctx, key, i,
 434                                                          NULL, pval);
 435                 }
 436         }
 437
 438         return WERR_BADFILE;
 439 }
 440
 441 WERROR reg_querymultiplevalues(TALLOC_CTX *mem_ctx,
 442                                struct registry_key *key,
 443                                uint32_t num_names,
 444                                const char **names,
 445                                uint32_t *pnum_vals,
 446                                struct registry_value **pvals)
 447 {
 448         WERROR err;
 449         uint32_t i, n, found = 0;
 450         struct registry_value *vals;
 451
 452         if (num_names == 0) {
 453                 return WERR_OK;
 454         }
 455
 456         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 457                 return WERR_ACCESS_DENIED;
 458         }
 459
 460         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 461                 return err;
 462         }
 463
 464         vals = talloc_zero_array(mem_ctx, struct registry_value, num_names);
 465         if (vals == NULL) {
 466                 return WERR_NOMEM;
 467         }
 468
 469         for (n=0; n < num_names; n++) {
 470                 for (i=0; i < regval_ctr_numvals(key->values); i++) {
 471                         struct regval_blob *blob;
 472                         blob = regval_ctr_specific_value(key->values, i);
 473                         if (strequal(regval_name(blob), names[n])) {
 474                                 struct registry_value *v;
 475                                 err = reg_enumvalue(mem_ctx, key, i, NULL, &v);
 476                                 if (!W_ERROR_IS_OK(err)) {
 477                                         return err;
 478                                 }
 479                                 vals[n] = *v;
 480                                 found++;
 481                         }
 482                 }
 483         }
 484
 485         *pvals = vals;
 486         *pnum_vals = found;
 487
 488         return WERR_OK;
 489 }
 490
 491 WERROR reg_queryinfokey(struct registry_key *key, uint32_t *num_subkeys,
 492                         uint32_t *max_subkeylen, uint32_t *max_subkeysize,
 493                         uint32_t *num_values, uint32_t *max_valnamelen,
 494                         uint32_t *max_valbufsize, uint32_t *secdescsize,
 495                         NTTIME *last_changed_time)
 496 {
 497         uint32 i, max_size;
 498         size_t max_len;
 499         TALLOC_CTX *mem_ctx;
 500         WERROR err;
 501         struct security_descriptor *secdesc;
 502
 503         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 504                 return WERR_ACCESS_DENIED;
 505         }
 506
 507         if (!W_ERROR_IS_OK(fill_subkey_cache(key)) ||
 508             !W_ERROR_IS_OK(fill_value_cache(key))) {
 509                 return WERR_BADFILE;
 510         }
 511
 512         max_len = 0;
 513         for (i=0; i< regsubkey_ctr_numkeys(key->subkeys); i++) {
 514                 max_len = MAX(max_len,
 515                         strlen(regsubkey_ctr_specific_key(key->subkeys, i)));
 516         }
 517
 518         *num_subkeys = regsubkey_ctr_numkeys(key->subkeys);
 519         *max_subkeylen = max_len;
 520         *max_subkeysize = 0;    /* Class length? */
 521
 522         max_len = 0;
 523         max_size = 0;
 524         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 525                 struct regval_blob *blob;
 526                 blob = regval_ctr_specific_value(key->values, i);
 527                 max_len = MAX(max_len, strlen(regval_name(blob)));
 528                 max_size = MAX(max_size, regval_size(blob));
 529         }
 530
 531         *num_values = regval_ctr_numvals(key->values);
 532         *max_valnamelen = max_len;
 533         *max_valbufsize = max_size;
 534
 535         if (!(mem_ctx = talloc_new(key))) {
 536                 return WERR_NOMEM;
 537         }
 538
 539         err = regkey_get_secdesc(mem_ctx, key->key, &secdesc);
 540         if (!W_ERROR_IS_OK(err)) {
 541                 TALLOC_FREE(mem_ctx);
 542                 return err;
 543         }
 544
 545         *secdescsize = ndr_size_security_descriptor(secdesc, 0);
 546         TALLOC_FREE(mem_ctx);
 547
 548         *last_changed_time = 0;
 549
 550         return WERR_OK;
 551 }
 552
 553 WERROR reg_createkey(TALLOC_CTX *ctx, struct registry_key *parent,
 554                      const char *subkeypath, uint32 desired_access,
 555                      struct registry_key **pkey,
 556                      enum winreg_CreateAction *paction)
 557 {
 558         struct registry_key *key = parent;
 559         TALLOC_CTX *mem_ctx;
 560         char *path, *end;
 561         WERROR err;
 562         uint32_t access_granted;
 563
 564         mem_ctx = talloc_new(ctx);
 565         if (mem_ctx == NULL) {
 566                 return WERR_NOMEM;
 567         }
 568
 569         path = talloc_strdup(mem_ctx, subkeypath);
 570         if (path == NULL) {
 571                 err = WERR_NOMEM;
 572                 goto done;
 573         }
 574
 575         err = regdb_transaction_start();
 576         if (!W_ERROR_IS_OK(err)) {
 577                 DEBUG(0, ("reg_createkey: failed to start transaction: %s\n",
 578                           win_errstr(err)));
 579                 goto done;
 580         }
 581
 582         while ((end = strchr(path, '\\')) != NULL) {
 583                 struct registry_key *tmp;
 584                 enum winreg_CreateAction action;
 585
 586                 *end = '\0';
 587
 588                 err = reg_createkey(mem_ctx, key, path,
 589                                     KEY_ENUMERATE_SUB_KEYS, &tmp, &action);
 590                 if (!W_ERROR_IS_OK(err)) {
 591                         goto trans_done;
 592                 }
 593
 594                 if (key != parent) {
 595                         TALLOC_FREE(key);
 596                 }
 597
 598                 key = tmp;
 599                 path = end+1;
 600         }
 601
 602         /*
 603          * At this point, "path" contains the one-element subkey of "key". We
 604          * can try to open it.
 605          */
 606
 607         err = reg_openkey(ctx, key, path, desired_access, pkey);
 608         if (W_ERROR_IS_OK(err)) {
 609                 if (paction != NULL) {
 610                         *paction = REG_OPENED_EXISTING_KEY;
 611                 }
 612                 goto trans_done;
 613         }
 614
 615         if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
 616                 /*
 617                  * Something but "notfound" has happened, so bail out
 618                  */
 619                 goto trans_done;
 620         }
 621
 622         /*
 623          * We may (e.g. in the iteration) have opened the key with ENUM_SUBKEY.
 624          * Instead of re-opening the key with CREATE_SUB_KEY, we simply
 625          * duplicate the access check here and skip the expensive full open.
 626          */
 627         if (!regkey_access_check(key->key, KEY_CREATE_SUB_KEY, &access_granted,
 628                                  key->token))
 629         {
 630                 err = WERR_ACCESS_DENIED;
 631                 goto done;
 632         }
 633
 634         /*
 635          * Actually create the subkey
 636          */
 637
 638         err = create_reg_subkey(key->key, path);
 639         if (!W_ERROR_IS_OK(err)) {
 640                 goto trans_done;
 641         }
 642
 643         /*
 644          * Now open the newly created key
 645          */
 646
 647         err = reg_openkey(ctx, key, path, desired_access, pkey);
 648         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 649                 *paction = REG_CREATED_NEW_KEY;
 650         }
 651
 652 trans_done:
 653         if (W_ERROR_IS_OK(err)) {
 654                 err = regdb_transaction_commit();
 655                 if (!W_ERROR_IS_OK(err)) {
 656                         DEBUG(0, ("reg_createkey: Error committing transaction: %s\n", win_errstr(err)));
 657                 }
 658         } else {
 659                 WERROR err1 = regdb_transaction_cancel();
 660                 if (!W_ERROR_IS_OK(err1)) {
 661                         DEBUG(0, ("reg_createkey: Error cancelling transaction: %s\n", win_errstr(err1)));
 662                 }
 663         }
 664
 665  done:
 666         TALLOC_FREE(mem_ctx);
 667         return err;
 668 }
 669
 670 static WERROR reg_deletekey_internal(TALLOC_CTX *mem_ctx,
 671                                      struct registry_key *parent,
 672                                      const char *path, bool lazy)
 673 {
 674         WERROR err;
 675         char *name, *end;
 676         struct registry_key *key;
 677         name = talloc_strdup(mem_ctx, path);
 678         if (name == NULL) {
 679                 err = WERR_NOMEM;
 680                 goto done;
 681         }
 682
 683         /* no subkeys - proceed with delete */
 684         end = strrchr(name, '\\');
 685         if (end != NULL) {
 686                 *end = '\0';
 687
 688                 err = reg_openkey(mem_ctx, parent, name,
 689                                   KEY_CREATE_SUB_KEY, &key);
 690                 W_ERROR_NOT_OK_GOTO_DONE(err);
 691
 692                 parent = key;
 693                 name = end+1;
 694         }
 695
 696         if (name[0] == '\0') {
 697                 err = WERR_INVALID_PARAM;
 698                 goto done;
 699         }
 700
 701         err = delete_reg_subkey(parent->key, name, lazy);
 702
 703 done:
 704         return err;
 705 }
 706
 707 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 708 {
 709         WERROR err;
 710         struct registry_key *key;
 711         TALLOC_CTX *mem_ctx = talloc_stackframe();
 712
 713         /* check if the key has subkeys */
 714         err = reg_openkey(mem_ctx, parent, path, REG_KEY_READ, &key);
 715         W_ERROR_NOT_OK_GOTO_DONE(err);
 716
 717         err = regdb_transaction_start();
 718         if (!W_ERROR_IS_OK(err)) {
 719                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 720                           win_errstr(err)));
 721                 goto done;
 722         }
 723
 724         err = fill_subkey_cache(key);
 725         if (!W_ERROR_IS_OK(err)) {
 726                 goto trans_done;
 727         }
 728
 729         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 730                 err = WERR_ACCESS_DENIED;
 731                 goto trans_done;
 732         }
 733         err = reg_deletekey_internal(mem_ctx, parent, path, false);
 734
 735 trans_done:
 736         if (W_ERROR_IS_OK(err)) {
 737                 err = regdb_transaction_commit();
 738                 if (!W_ERROR_IS_OK(err)) {
 739                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 740                 }
 741         } else {
 742                 WERROR err1 = regdb_transaction_cancel();
 743                 if (!W_ERROR_IS_OK(err1)) {
 744                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 745                 }
 746         }
 747
 748 done:
 749         TALLOC_FREE(mem_ctx);
 750         return err;
 751 }
 752
 753
 754 WERROR reg_setvalue(struct registry_key *key, const char *name,
 755                     const struct registry_value *val)
 756 {
 757         struct regval_blob *existing;
 758         WERROR err;
 759         int res;
 760
 761         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 762                 return WERR_ACCESS_DENIED;
 763         }
 764
 765         err = regdb_transaction_start();
 766         if (!W_ERROR_IS_OK(err)) {
 767                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 768                           win_errstr(err)));
 769                 return err;
 770         }
 771
 772         err = fill_value_cache(key);
 773         if (!W_ERROR_IS_OK(err)) {
 774                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 775                 goto done;
 776         }
 777
 778         existing = regval_ctr_getvalue(key->values, name);
 779
 780         if ((existing != NULL) &&
 781             (regval_size(existing) == val->data.length) &&
 782             (memcmp(regval_data_p(existing), val->data.data,
 783                     val->data.length) == 0))
 784         {
 785                 err = WERR_OK;
 786                 goto done;
 787         }
 788
 789         res = regval_ctr_addvalue(key->values, name, val->type,
 790                                   val->data.data, val->data.length);
 791
 792         if (res == 0) {
 793                 TALLOC_FREE(key->values);
 794                 err = WERR_NOMEM;
 795                 goto done;
 796         }
 797
 798         if (!store_reg_values(key->key, key->values)) {
 799                 TALLOC_FREE(key->values);
 800                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 801                 err = WERR_REG_IO_FAILURE;
 802                 goto done;
 803         }
 804
 805         err = WERR_OK;
 806
 807 done:
 808         if (W_ERROR_IS_OK(err)) {
 809                 err = regdb_transaction_commit();
 810                 if (!W_ERROR_IS_OK(err)) {
 811                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 812                 }
 813         } else {
 814                 WERROR err1 = regdb_transaction_cancel();
 815                 if (!W_ERROR_IS_OK(err1)) {
 816                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 817                 }
 818         }
 819
 820         return err;
 821 }
 822
 823 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 824 {
 825         struct regval_blob *blob;
 826
 827         blob = regval_ctr_getvalue(key->values, name);
 828
 829         if (blob == NULL) {
 830                 return WERR_BADFILE;
 831         } else {
 832                 return WERR_OK;
 833         }
 834 }
 835
 836 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 837 {
 838         WERROR err;
 839
 840         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 841                 return WERR_ACCESS_DENIED;
 842         }
 843
 844         err = regdb_transaction_start();
 845         if (!W_ERROR_IS_OK(err)) {
 846                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 847                           win_errstr(err)));
 848                 return err;
 849         }
 850
 851         err = fill_value_cache(key);
 852         if (!W_ERROR_IS_OK(err)) {
 853                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 854                           win_errstr(err)));
 855                 goto done;
 856         }
 857
 858         err = reg_value_exists(key, name);
 859         if (!W_ERROR_IS_OK(err)) {
 860                 goto done;
 861         }
 862
 863         regval_ctr_delvalue(key->values, name);
 864
 865         if (!store_reg_values(key->key, key->values)) {
 866                 TALLOC_FREE(key->values);
 867                 err = WERR_REG_IO_FAILURE;
 868                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 869                 goto done;
 870         }
 871
 872         err = WERR_OK;
 873
 874 done:
 875         if (W_ERROR_IS_OK(err)) {
 876                 err = regdb_transaction_commit();
 877                 if (!W_ERROR_IS_OK(err)) {
 878                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 879                 }
 880         } else {
 881                 WERROR err1 = regdb_transaction_cancel();
 882                 if (!W_ERROR_IS_OK(err1)) {
 883                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 884                 }
 885         }
 886
 887         return err;
 888 }
 889
 890 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 891                           struct security_descriptor **psecdesc)
 892 {
 893         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 894 }
 895
 896 WERROR reg_setkeysecurity(struct registry_key *key,
 897                           struct security_descriptor *psecdesc)
 898 {
 899         return regkey_set_secdesc(key->key, psecdesc);
 900 }
 901
 902 WERROR reg_getversion(uint32_t *version)
 903 {
 904         if (version == NULL) {
 905                 return WERR_INVALID_PARAM;
 906         }
 907
 908         *version = 0x00000005; /* Windows 2000 registry API version */
 909         return WERR_OK;
 910 }
 911
 912 /**********************************************************************
 913  * Higher level utility functions
 914  **********************************************************************/
 915
 916 WERROR reg_deleteallvalues(struct registry_key *key)
 917 {
 918         WERROR err;
 919         int i;
 920
 921         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 922                 return WERR_ACCESS_DENIED;
 923         }
 924
 925         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 926                 return err;
 927         }
 928
 929         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 930                 struct regval_blob *blob;
 931                 blob = regval_ctr_specific_value(key->values, i);
 932                 regval_ctr_delvalue(key->values, regval_name(blob));
 933         }
 934
 935         if (!store_reg_values(key->key, key->values)) {
 936                 TALLOC_FREE(key->values);
 937                 return WERR_REG_IO_FAILURE;
 938         }
 939
 940         return WERR_OK;
 941 }
 942
 943 /*
 944  * Utility function to delete a registry key with all its subkeys.
 945  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 946  * key that has subkeys.
 947  */
 948 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 949                                                const char *path,
 950                                                bool del_key, bool lazy)
 951 {
 952         WERROR werr = WERR_OK;
 953         struct registry_key *key;
 954         char *subkey_name = NULL;
 955         uint32 i;
 956         TALLOC_CTX *mem_ctx = talloc_stackframe();
 957
 958         DEBUG(5, ("reg_deletekey_recursive_internal: deleting '%s' from '%s'\n",
 959                   path, parent->key->name));
 960
 961         /* recurse through subkeys first */
 962         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 963         if (!W_ERROR_IS_OK(werr)) {
 964                 DEBUG(3, ("reg_deletekey_recursive_internal: error opening "
 965                           "subkey '%s' of '%s': '%s'\n",
 966                           path, parent->key->name, win_errstr(werr)));
 967                 goto done;
 968         }
 969
 970         werr = fill_subkey_cache(key);
 971         W_ERROR_NOT_OK_GOTO_DONE(werr);
 972
 973         /*
 974          * loop from top to bottom for perfomance:
 975          * this way, we need to rehash the regsubkey containers less
 976          */
 977         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 978                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 979                 werr = reg_deletekey_recursive_internal(key, subkey_name, true, del_key);
 980                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 981         }
 982
 983         if (del_key) {
 984                 /* now delete the actual key */
 985                 werr = reg_deletekey_internal(mem_ctx, parent, path, lazy);
 986         }
 987
 988 done:
 989
 990         DEBUG(5, ("reg_deletekey_recursive_internal: done deleting '%s' from "
 991                   "'%s': %s\n",
 992                   path, parent->key->name, win_errstr(werr)));
 993         TALLOC_FREE(mem_ctx);
 994         return werr;
 995 }
 996
 997 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
 998                                             const char *path,
 999                                             bool del_key)
1000 {
1001         WERROR werr;
1002
1003         werr = regdb_transaction_start();
1004         if (!W_ERROR_IS_OK(werr)) {
1005                 DEBUG(0, ("reg_deletekey_recursive_trans: "
1006                           "error starting transaction: %s\n",
1007                           win_errstr(werr)));
1008                 return werr;
1009         }
1010
1011         werr = reg_deletekey_recursive_internal(parent, path, del_key, false);
1012
1013         if (!W_ERROR_IS_OK(werr)) {
1014                 WERROR werr2;
1015                 DEBUG(W_ERROR_EQUAL(werr, WERR_BADFILE) ? 5 : 1,
1016                       (__location__ ": failed to delete key '%s' from key "
1017                        "'%s': %s\n", path, parent->key->name,
1018                        win_errstr(werr)));
1019
1020                 werr2 = regdb_transaction_cancel();
1021                 if (!W_ERROR_IS_OK(werr2)) {
1022                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1023                                   "error cancelling transaction: %s\n",
1024                                   win_errstr(werr2)));
1025                         /*
1026                          * return the original werr or the
1027                          * error from cancelling the transaction?
1028                          */
1029                 }
1030         } else {
1031                 werr = regdb_transaction_commit();
1032                 if (!W_ERROR_IS_OK(werr)) {
1033                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1034                                   "error committing transaction: %s\n",
1035                                   win_errstr(werr)));
1036                 } else {
1037                         DEBUG(5, ("reg_reletekey_recursive_trans: deleted key '%s' from '%s'\n",
1038                                   path, parent->key->name));
1039
1040                 }
1041         }
1042
1043         return werr;
1044 }
1045
1046 WERROR reg_deletekey_recursive(struct registry_key *parent,
1047                                const char *path)
1048 {
1049         return reg_deletekey_recursive_trans(parent, path, true);
1050 }
1051
1052 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1053                                    const char *path)
1054 {
1055         return reg_deletekey_recursive_trans(parent, path, false);
1056 }
1057