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         struct registry_key *create_parent;
 558         TALLOC_CTX *mem_ctx;
 559         char *path, *end;
 560         WERROR err;
 561         uint32_t access_granted;
 562
 563         mem_ctx = talloc_new(ctx);
 564         if (mem_ctx == NULL) {
 565                 return WERR_NOMEM;
 566         }
 567
 568         path = talloc_strdup(mem_ctx, subkeypath);
 569         if (path == NULL) {
 570                 err = WERR_NOMEM;
 571                 goto done;
 572         }
 573
 574         err = regdb_transaction_start();
 575         if (!W_ERROR_IS_OK(err)) {
 576                 DEBUG(0, ("reg_createkey: failed to start transaction: %s\n",
 577                           win_errstr(err)));
 578                 goto done;
 579         }
 580
 581         while ((end = strchr(path, '\\')) != NULL) {
 582                 struct registry_key *tmp;
 583                 enum winreg_CreateAction action;
 584
 585                 *end = '\0';
 586
 587                 err = reg_createkey(mem_ctx, key, path,
 588                                     KEY_ENUMERATE_SUB_KEYS, &tmp, &action);
 589                 if (!W_ERROR_IS_OK(err)) {
 590                         goto trans_done;
 591                 }
 592
 593                 if (key != parent) {
 594                         TALLOC_FREE(key);
 595                 }
 596
 597                 key = tmp;
 598                 path = end+1;
 599         }
 600
 601         /*
 602          * At this point, "path" contains the one-element subkey of "key". We
 603          * can try to open it.
 604          */
 605
 606         err = reg_openkey(ctx, key, path, desired_access, pkey);
 607         if (W_ERROR_IS_OK(err)) {
 608                 if (paction != NULL) {
 609                         *paction = REG_OPENED_EXISTING_KEY;
 610                 }
 611                 goto trans_done;
 612         }
 613
 614         if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
 615                 /*
 616                  * Something but "notfound" has happened, so bail out
 617                  */
 618                 goto trans_done;
 619         }
 620
 621         /*
 622          * We may (e.g. in the iteration) have opened the key with ENUM_SUBKEY.
 623          * Instead of re-opening the key with CREATE_SUB_KEY, we simply
 624          * duplicate the access check here and skip the expensive full open.
 625          */
 626         if (!regkey_access_check(key->key, KEY_CREATE_SUB_KEY, &access_granted,
 627                                  key->token))
 628         {
 629                 err = WERR_ACCESS_DENIED;
 630                 goto done;
 631         }
 632
 633         /*
 634          * Actually create the subkey
 635          */
 636
 637         err = create_reg_subkey(key->key, path);
 638         if (!W_ERROR_IS_OK(err)) {
 639                 goto trans_done;
 640         }
 641
 642         /*
 643          * Now open the newly created key
 644          */
 645
 646         err = reg_openkey(ctx, key, path, desired_access, pkey);
 647         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 648                 *paction = REG_CREATED_NEW_KEY;
 649         }
 650
 651 trans_done:
 652         if (W_ERROR_IS_OK(err)) {
 653                 err = regdb_transaction_commit();
 654                 if (!W_ERROR_IS_OK(err)) {
 655                         DEBUG(0, ("reg_createkey: Error committing transaction: %s\n", win_errstr(err)));
 656                 }
 657         } else {
 658                 WERROR err1 = regdb_transaction_cancel();
 659                 if (!W_ERROR_IS_OK(err1)) {
 660                         DEBUG(0, ("reg_createkey: Error cancelling transaction: %s\n", win_errstr(err1)));
 661                 }
 662         }
 663
 664  done:
 665         TALLOC_FREE(mem_ctx);
 666         return err;
 667 }
 668
 669 static WERROR reg_deletekey_internal(TALLOC_CTX *mem_ctx,
 670                                      struct registry_key *parent,
 671                                      const char *path, bool lazy)
 672 {
 673         WERROR err;
 674         char *name, *end;
 675         struct registry_key *key;
 676         name = talloc_strdup(mem_ctx, path);
 677         if (name == NULL) {
 678                 err = WERR_NOMEM;
 679                 goto done;
 680         }
 681
 682         /* no subkeys - proceed with delete */
 683         end = strrchr(name, '\\');
 684         if (end != NULL) {
 685                 *end = '\0';
 686
 687                 err = reg_openkey(mem_ctx, parent, name,
 688                                   KEY_CREATE_SUB_KEY, &key);
 689                 W_ERROR_NOT_OK_GOTO_DONE(err);
 690
 691                 parent = key;
 692                 name = end+1;
 693         }
 694
 695         if (name[0] == '\0') {
 696                 err = WERR_INVALID_PARAM;
 697                 goto done;
 698         }
 699
 700         err = delete_reg_subkey(parent->key, name, lazy);
 701
 702 done:
 703         return err;
 704 }
 705
 706 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 707 {
 708         WERROR err;
 709         struct registry_key *key;
 710         TALLOC_CTX *mem_ctx = talloc_stackframe();
 711
 712         /* check if the key has subkeys */
 713         err = reg_openkey(mem_ctx, parent, path, REG_KEY_READ, &key);
 714         W_ERROR_NOT_OK_GOTO_DONE(err);
 715
 716         err = regdb_transaction_start();
 717         if (!W_ERROR_IS_OK(err)) {
 718                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 719                           win_errstr(err)));
 720                 goto done;
 721         }
 722
 723         err = fill_subkey_cache(key);
 724         if (!W_ERROR_IS_OK(err)) {
 725                 goto trans_done;
 726         }
 727
 728         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 729                 err = WERR_ACCESS_DENIED;
 730                 goto trans_done;
 731         }
 732         err = reg_deletekey_internal(mem_ctx, parent, path, false);
 733
 734 trans_done:
 735         if (W_ERROR_IS_OK(err)) {
 736                 err = regdb_transaction_commit();
 737                 if (!W_ERROR_IS_OK(err)) {
 738                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 739                 }
 740         } else {
 741                 WERROR err1 = regdb_transaction_cancel();
 742                 if (!W_ERROR_IS_OK(err1)) {
 743                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 744                 }
 745         }
 746
 747 done:
 748         TALLOC_FREE(mem_ctx);
 749         return err;
 750 }
 751
 752
 753 WERROR reg_setvalue(struct registry_key *key, const char *name,
 754                     const struct registry_value *val)
 755 {
 756         struct regval_blob *existing;
 757         WERROR err;
 758         int res;
 759
 760         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 761                 return WERR_ACCESS_DENIED;
 762         }
 763
 764         err = regdb_transaction_start();
 765         if (!W_ERROR_IS_OK(err)) {
 766                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 767                           win_errstr(err)));
 768                 return err;
 769         }
 770
 771         err = fill_value_cache(key);
 772         if (!W_ERROR_IS_OK(err)) {
 773                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 774                 goto done;
 775         }
 776
 777         existing = regval_ctr_getvalue(key->values, name);
 778
 779         if ((existing != NULL) &&
 780             (regval_size(existing) == val->data.length) &&
 781             (memcmp(regval_data_p(existing), val->data.data,
 782                     val->data.length) == 0))
 783         {
 784                 err = WERR_OK;
 785                 goto done;
 786         }
 787
 788         res = regval_ctr_addvalue(key->values, name, val->type,
 789                                   val->data.data, val->data.length);
 790
 791         if (res == 0) {
 792                 TALLOC_FREE(key->values);
 793                 err = WERR_NOMEM;
 794                 goto done;
 795         }
 796
 797         if (!store_reg_values(key->key, key->values)) {
 798                 TALLOC_FREE(key->values);
 799                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 800                 err = WERR_REG_IO_FAILURE;
 801                 goto done;
 802         }
 803
 804         err = WERR_OK;
 805
 806 done:
 807         if (W_ERROR_IS_OK(err)) {
 808                 err = regdb_transaction_commit();
 809                 if (!W_ERROR_IS_OK(err)) {
 810                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 811                 }
 812         } else {
 813                 WERROR err1 = regdb_transaction_cancel();
 814                 if (!W_ERROR_IS_OK(err1)) {
 815                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 816                 }
 817         }
 818
 819         return err;
 820 }
 821
 822 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 823 {
 824         struct regval_blob *blob;
 825
 826         blob = regval_ctr_getvalue(key->values, name);
 827
 828         if (blob == NULL) {
 829                 return WERR_BADFILE;
 830         } else {
 831                 return WERR_OK;
 832         }
 833 }
 834
 835 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 836 {
 837         WERROR err;
 838
 839         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 840                 return WERR_ACCESS_DENIED;
 841         }
 842
 843         err = regdb_transaction_start();
 844         if (!W_ERROR_IS_OK(err)) {
 845                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 846                           win_errstr(err)));
 847                 return err;
 848         }
 849
 850         err = fill_value_cache(key);
 851         if (!W_ERROR_IS_OK(err)) {
 852                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 853                           win_errstr(err)));
 854                 goto done;
 855         }
 856
 857         err = reg_value_exists(key, name);
 858         if (!W_ERROR_IS_OK(err)) {
 859                 goto done;
 860         }
 861
 862         regval_ctr_delvalue(key->values, name);
 863
 864         if (!store_reg_values(key->key, key->values)) {
 865                 TALLOC_FREE(key->values);
 866                 err = WERR_REG_IO_FAILURE;
 867                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 868                 goto done;
 869         }
 870
 871         err = WERR_OK;
 872
 873 done:
 874         if (W_ERROR_IS_OK(err)) {
 875                 err = regdb_transaction_commit();
 876                 if (!W_ERROR_IS_OK(err)) {
 877                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 878                 }
 879         } else {
 880                 WERROR err1 = regdb_transaction_cancel();
 881                 if (!W_ERROR_IS_OK(err1)) {
 882                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 883                 }
 884         }
 885
 886         return err;
 887 }
 888
 889 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 890                           struct security_descriptor **psecdesc)
 891 {
 892         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 893 }
 894
 895 WERROR reg_setkeysecurity(struct registry_key *key,
 896                           struct security_descriptor *psecdesc)
 897 {
 898         return regkey_set_secdesc(key->key, psecdesc);
 899 }
 900
 901 WERROR reg_getversion(uint32_t *version)
 902 {
 903         if (version == NULL) {
 904                 return WERR_INVALID_PARAM;
 905         }
 906
 907         *version = 0x00000005; /* Windows 2000 registry API version */
 908         return WERR_OK;
 909 }
 910
 911 /**********************************************************************
 912  * Higher level utility functions
 913  **********************************************************************/
 914
 915 WERROR reg_deleteallvalues(struct registry_key *key)
 916 {
 917         WERROR err;
 918         int i;
 919
 920         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 921                 return WERR_ACCESS_DENIED;
 922         }
 923
 924         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 925                 return err;
 926         }
 927
 928         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 929                 struct regval_blob *blob;
 930                 blob = regval_ctr_specific_value(key->values, i);
 931                 regval_ctr_delvalue(key->values, regval_name(blob));
 932         }
 933
 934         if (!store_reg_values(key->key, key->values)) {
 935                 TALLOC_FREE(key->values);
 936                 return WERR_REG_IO_FAILURE;
 937         }
 938
 939         return WERR_OK;
 940 }
 941
 942 /*
 943  * Utility function to delete a registry key with all its subkeys.
 944  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 945  * key that has subkeys.
 946  */
 947 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 948                                                const char *path,
 949                                                bool del_key, bool lazy)
 950 {
 951         WERROR werr = WERR_OK;
 952         struct registry_key *key;
 953         char *subkey_name = NULL;
 954         uint32 i;
 955         TALLOC_CTX *mem_ctx = talloc_stackframe();
 956
 957         DEBUG(5, ("reg_deletekey_recursive_internal: deleting '%s' from '%s'\n",
 958                   path, parent->key->name));
 959
 960         /* recurse through subkeys first */
 961         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 962         if (!W_ERROR_IS_OK(werr)) {
 963                 DEBUG(3, ("reg_deletekey_recursive_internal: error opening "
 964                           "subkey '%s' of '%s': '%s'\n",
 965                           path, parent->key->name, win_errstr(werr)));
 966                 goto done;
 967         }
 968
 969         werr = fill_subkey_cache(key);
 970         W_ERROR_NOT_OK_GOTO_DONE(werr);
 971
 972         /*
 973          * loop from top to bottom for perfomance:
 974          * this way, we need to rehash the regsubkey containers less
 975          */
 976         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 977                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 978                 werr = reg_deletekey_recursive_internal(key, subkey_name, true, del_key);
 979                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 980         }
 981
 982         if (del_key) {
 983                 /* now delete the actual key */
 984                 werr = reg_deletekey_internal(mem_ctx, parent, path, lazy);
 985         }
 986
 987 done:
 988
 989         DEBUG(5, ("reg_deletekey_recursive_internal: done deleting '%s' from "
 990                   "'%s': %s\n",
 991                   path, parent->key->name, win_errstr(werr)));
 992         TALLOC_FREE(mem_ctx);
 993         return werr;
 994 }
 995
 996 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
 997                                             const char *path,
 998                                             bool del_key)
 999 {
1000         WERROR werr;
1001
1002         werr = regdb_transaction_start();
1003         if (!W_ERROR_IS_OK(werr)) {
1004                 DEBUG(0, ("reg_deletekey_recursive_trans: "
1005                           "error starting transaction: %s\n",
1006                           win_errstr(werr)));
1007                 return werr;
1008         }
1009
1010         werr = reg_deletekey_recursive_internal(parent, path, del_key, false);
1011
1012         if (!W_ERROR_IS_OK(werr)) {
1013                 WERROR werr2;
1014
1015                 DEBUG(1, (__location__ " failed to delete key '%s' from key "
1016                           "'%s': %s\n", path, parent->key->name,
1017                           win_errstr(werr)));
1018
1019                 werr2 = regdb_transaction_cancel();
1020                 if (!W_ERROR_IS_OK(werr2)) {
1021                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1022                                   "error cancelling transaction: %s\n",
1023                                   win_errstr(werr2)));
1024                         /*
1025                          * return the original werr or the
1026                          * error from cancelling the transaction?
1027                          */
1028                 }
1029         } else {
1030                 werr = regdb_transaction_commit();
1031                 if (!W_ERROR_IS_OK(werr)) {
1032                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1033                                   "error committing transaction: %s\n",
1034                                   win_errstr(werr)));
1035                 } else {
1036                         DEBUG(5, ("reg_reletekey_recursive_trans: deleted key '%s' from '%s'\n",
1037                                   path, parent->key->name));
1038
1039                 }
1040         }
1041
1042         return werr;
1043 }
1044
1045 WERROR reg_deletekey_recursive(struct registry_key *parent,
1046                                const char *path)
1047 {
1048         return reg_deletekey_recursive_trans(parent, path, true);
1049 }
1050
1051 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1052                                    const char *path)
1053 {
1054         return reg_deletekey_recursive_trans(parent, path, false);
1055 }
1056