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         struct regsubkey_ctr    *subkeys = NULL;
 142
 143         DEBUG(7,("regkey_open_onelevel: name = [%s]\n", name));
 144
 145         SMB_ASSERT(strchr(name, '\\') == NULL);
 146
 147         if (!(regkey = talloc_zero(mem_ctx, struct registry_key)) ||
 148             !(regkey->token = dup_nt_token(regkey, token)) ||
 149             !(regkey->key = talloc_zero(regkey, struct registry_key_handle)))
 150         {
 151                 result = WERR_NOMEM;
 152                 goto done;
 153         }
 154
 155         result = regdb_open();
 156         if (!(W_ERROR_IS_OK(result))) {
 157                 goto done;
 158         }
 159
 160         key = regkey->key;
 161         talloc_set_destructor(key, regkey_destructor);
 162
 163         /* initialization */
 164
 165         key->type = REG_KEY_GENERIC;
 166
 167         if (name[0] == '\0') {
 168                 /*
 169                  * Open a copy of the parent key
 170                  */
 171                 if (!parent) {
 172                         result = WERR_BADFILE;
 173                         goto done;
 174                 }
 175                 key->name = talloc_strdup(key, parent->key->name);
 176         }
 177         else {
 178                 /*
 179                  * Normal subkey open
 180                  */
 181                 key->name = talloc_asprintf(key, "%s%s%s",
 182                                             parent ? parent->key->name : "",
 183                                             parent ? "\\": "",
 184                                             name);
 185         }
 186
 187         if (key->name == NULL) {
 188                 result = WERR_NOMEM;
 189                 goto done;
 190         }
 191
 192         /* Tag this as a Performance Counter Key */
 193
 194         if( strncasecmp_m(key->name, KEY_HKPD, strlen(KEY_HKPD)) == 0 )
 195                 key->type = REG_KEY_HKPD;
 196
 197         /* Look up the table of registry I/O operations */
 198
 199         key->ops = reghook_cache_find( key->name );
 200         if (key->ops == NULL) {
 201                 DEBUG(0,("reg_open_onelevel: Failed to assign "
 202                          "registry_ops to [%s]\n", key->name ));
 203                 result = WERR_BADFILE;
 204                 goto done;
 205         }
 206
 207         /* check if the path really exists; failed is indicated by -1 */
 208         /* if the subkey count failed, bail out */
 209
 210         result = regsubkey_ctr_init(key, &subkeys);
 211         if (!W_ERROR_IS_OK(result)) {
 212                 goto done;
 213         }
 214
 215         if ( fetch_reg_keys( key, subkeys ) == -1 )  {
 216                 result = WERR_BADFILE;
 217                 goto done;
 218         }
 219
 220         TALLOC_FREE( subkeys );
 221
 222         if ( !regkey_access_check( key, access_desired, &key->access_granted,
 223                                    token ) ) {
 224                 result = WERR_ACCESS_DENIED;
 225                 goto done;
 226         }
 227
 228         *pregkey = regkey;
 229         result = WERR_OK;
 230
 231 done:
 232         if ( !W_ERROR_IS_OK(result) ) {
 233                 TALLOC_FREE(regkey);
 234         }
 235
 236         return result;
 237 }
 238
 239 WERROR reg_openhive(TALLOC_CTX *mem_ctx, const char *hive,
 240                     uint32 desired_access,
 241                     const struct security_token *token,
 242                     struct registry_key **pkey)
 243 {
 244         SMB_ASSERT(hive != NULL);
 245         SMB_ASSERT(hive[0] != '\0');
 246         SMB_ASSERT(strchr(hive, '\\') == NULL);
 247
 248         return regkey_open_onelevel(mem_ctx, NULL, hive, token, desired_access,
 249                                     pkey);
 250 }
 251
 252
 253 /**********************************************************************
 254  * The API functions
 255  **********************************************************************/
 256
 257 WERROR reg_openkey(TALLOC_CTX *mem_ctx, struct registry_key *parent,
 258                    const char *name, uint32 desired_access,
 259                    struct registry_key **pkey)
 260 {
 261         struct registry_key *direct_parent = parent;
 262         WERROR err;
 263         char *p, *path;
 264         size_t len;
 265         TALLOC_CTX *frame = talloc_stackframe();
 266
 267         path = talloc_strdup(frame, name);
 268         if (path == NULL) {
 269                 err = WERR_NOMEM;
 270                 goto error;
 271         }
 272
 273         len = strlen(path);
 274
 275         if ((len > 0) && (path[len-1] == '\\')) {
 276                 path[len-1] = '\0';
 277         }
 278
 279         while ((p = strchr(path, '\\')) != NULL) {
 280                 char *name_component;
 281                 struct registry_key *tmp;
 282
 283                 name_component = talloc_strndup(frame, path, (p - path));
 284                 if (name_component == NULL) {
 285                         err = WERR_NOMEM;
 286                         goto error;
 287                 }
 288
 289                 err = regkey_open_onelevel(frame, direct_parent,
 290                                            name_component, parent->token,
 291                                            KEY_ENUMERATE_SUB_KEYS, &tmp);
 292
 293                 if (!W_ERROR_IS_OK(err)) {
 294                         goto error;
 295                 }
 296
 297                 direct_parent = tmp;
 298                 path = p+1;
 299         }
 300
 301         err = regkey_open_onelevel(mem_ctx, direct_parent, path, parent->token,
 302                                    desired_access, pkey);
 303
 304 error:
 305         talloc_free(frame);
 306         return err;
 307 }
 308
 309 WERROR reg_enumkey(TALLOC_CTX *mem_ctx, struct registry_key *key,
 310                    uint32 idx, char **name, NTTIME *last_write_time)
 311 {
 312         WERROR err;
 313
 314         if (!(key->key->access_granted & KEY_ENUMERATE_SUB_KEYS)) {
 315                 return WERR_ACCESS_DENIED;
 316         }
 317
 318         if (!W_ERROR_IS_OK(err = fill_subkey_cache(key))) {
 319                 return err;
 320         }
 321
 322         if (idx >= regsubkey_ctr_numkeys(key->subkeys)) {
 323                 return WERR_NO_MORE_ITEMS;
 324         }
 325
 326         if (!(*name = talloc_strdup(mem_ctx,
 327                         regsubkey_ctr_specific_key(key->subkeys, idx))))
 328         {
 329                 return WERR_NOMEM;
 330         }
 331
 332         if (last_write_time) {
 333                 *last_write_time = 0;
 334         }
 335
 336         return WERR_OK;
 337 }
 338
 339 WERROR reg_enumvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 340                      uint32 idx, char **pname, struct registry_value **pval)
 341 {
 342         struct registry_value *val;
 343         struct regval_blob *blob;
 344         WERROR err;
 345
 346         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 347                 return WERR_ACCESS_DENIED;
 348         }
 349
 350         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 351                 return err;
 352         }
 353
 354         if (idx >= regval_ctr_numvals(key->values)) {
 355                 return WERR_NO_MORE_ITEMS;
 356         }
 357
 358         blob = regval_ctr_specific_value(key->values, idx);
 359
 360         val = talloc_zero(mem_ctx, struct registry_value);
 361         if (val == NULL) {
 362                 return WERR_NOMEM;
 363         }
 364
 365         val->type = regval_type(blob);
 366         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 367
 368         if (pname
 369             && !(*pname = talloc_strdup(
 370                          mem_ctx, regval_name(blob)))) {
 371                 TALLOC_FREE(val);
 372                 return WERR_NOMEM;
 373         }
 374
 375         *pval = val;
 376         return WERR_OK;
 377 }
 378
 379 static WERROR reg_enumvalue_nocachefill(TALLOC_CTX *mem_ctx,
 380                                         struct registry_key *key,
 381                                         uint32 idx, char **pname,
 382                                         struct registry_value **pval)
 383 {
 384         struct registry_value *val;
 385         struct regval_blob *blob;
 386
 387         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 388                 return WERR_ACCESS_DENIED;
 389         }
 390
 391         if (idx >= regval_ctr_numvals(key->values)) {
 392                 return WERR_NO_MORE_ITEMS;
 393         }
 394
 395         blob = regval_ctr_specific_value(key->values, idx);
 396
 397         val = talloc_zero(mem_ctx, struct registry_value);
 398         if (val == NULL) {
 399                 return WERR_NOMEM;
 400         }
 401
 402         val->type = regval_type(blob);
 403         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 404
 405         if (pname
 406             && !(*pname = talloc_strdup(
 407                          mem_ctx, regval_name(blob)))) {
 408                 TALLOC_FREE(val);
 409                 return WERR_NOMEM;
 410         }
 411
 412         *pval = val;
 413         return WERR_OK;
 414 }
 415
 416 WERROR reg_queryvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 417                       const char *name, struct registry_value **pval)
 418 {
 419         WERROR err;
 420         uint32 i;
 421
 422         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 423                 return WERR_ACCESS_DENIED;
 424         }
 425
 426         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 427                 return err;
 428         }
 429
 430         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 431                 struct regval_blob *blob;
 432                 blob = regval_ctr_specific_value(key->values, i);
 433                 if (strequal(regval_name(blob), name)) {
 434                         /*
 435                          * don't use reg_enumvalue here:
 436                          * re-reading the values from the disk
 437                          * would change the indexing and break
 438                          * this function.
 439                          */
 440                         return reg_enumvalue_nocachefill(mem_ctx, key, i,
 441                                                          NULL, pval);
 442                 }
 443         }
 444
 445         return WERR_BADFILE;
 446 }
 447
 448 WERROR reg_querymultiplevalues(TALLOC_CTX *mem_ctx,
 449                                struct registry_key *key,
 450                                uint32_t num_names,
 451                                const char **names,
 452                                uint32_t *pnum_vals,
 453                                struct registry_value **pvals)
 454 {
 455         WERROR err;
 456         uint32_t i, n, found = 0;
 457         struct registry_value *vals;
 458
 459         if (num_names == 0) {
 460                 return WERR_OK;
 461         }
 462
 463         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 464                 return WERR_ACCESS_DENIED;
 465         }
 466
 467         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 468                 return err;
 469         }
 470
 471         vals = talloc_zero_array(mem_ctx, struct registry_value, num_names);
 472         if (vals == NULL) {
 473                 return WERR_NOMEM;
 474         }
 475
 476         for (n=0; n < num_names; n++) {
 477                 for (i=0; i < regval_ctr_numvals(key->values); i++) {
 478                         struct regval_blob *blob;
 479                         blob = regval_ctr_specific_value(key->values, i);
 480                         if (strequal(regval_name(blob), names[n])) {
 481                                 struct registry_value *v;
 482                                 err = reg_enumvalue(mem_ctx, key, i, NULL, &v);
 483                                 if (!W_ERROR_IS_OK(err)) {
 484                                         return err;
 485                                 }
 486                                 vals[n] = *v;
 487                                 found++;
 488                         }
 489                 }
 490         }
 491
 492         *pvals = vals;
 493         *pnum_vals = found;
 494
 495         return WERR_OK;
 496 }
 497
 498 WERROR reg_queryinfokey(struct registry_key *key, uint32_t *num_subkeys,
 499                         uint32_t *max_subkeylen, uint32_t *max_subkeysize,
 500                         uint32_t *num_values, uint32_t *max_valnamelen,
 501                         uint32_t *max_valbufsize, uint32_t *secdescsize,
 502                         NTTIME *last_changed_time)
 503 {
 504         uint32 i, max_size;
 505         size_t max_len;
 506         TALLOC_CTX *mem_ctx;
 507         WERROR err;
 508         struct security_descriptor *secdesc;
 509
 510         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 511                 return WERR_ACCESS_DENIED;
 512         }
 513
 514         if (!W_ERROR_IS_OK(fill_subkey_cache(key)) ||
 515             !W_ERROR_IS_OK(fill_value_cache(key))) {
 516                 return WERR_BADFILE;
 517         }
 518
 519         max_len = 0;
 520         for (i=0; i< regsubkey_ctr_numkeys(key->subkeys); i++) {
 521                 max_len = MAX(max_len,
 522                         strlen(regsubkey_ctr_specific_key(key->subkeys, i)));
 523         }
 524
 525         *num_subkeys = regsubkey_ctr_numkeys(key->subkeys);
 526         *max_subkeylen = max_len;
 527         *max_subkeysize = 0;    /* Class length? */
 528
 529         max_len = 0;
 530         max_size = 0;
 531         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 532                 struct regval_blob *blob;
 533                 blob = regval_ctr_specific_value(key->values, i);
 534                 max_len = MAX(max_len, strlen(regval_name(blob)));
 535                 max_size = MAX(max_size, regval_size(blob));
 536         }
 537
 538         *num_values = regval_ctr_numvals(key->values);
 539         *max_valnamelen = max_len;
 540         *max_valbufsize = max_size;
 541
 542         if (!(mem_ctx = talloc_new(key))) {
 543                 return WERR_NOMEM;
 544         }
 545
 546         err = regkey_get_secdesc(mem_ctx, key->key, &secdesc);
 547         if (!W_ERROR_IS_OK(err)) {
 548                 TALLOC_FREE(mem_ctx);
 549                 return err;
 550         }
 551
 552         *secdescsize = ndr_size_security_descriptor(secdesc, 0);
 553         TALLOC_FREE(mem_ctx);
 554
 555         *last_changed_time = 0;
 556
 557         return WERR_OK;
 558 }
 559
 560 WERROR reg_createkey(TALLOC_CTX *ctx, struct registry_key *parent,
 561                      const char *subkeypath, uint32 desired_access,
 562                      struct registry_key **pkey,
 563                      enum winreg_CreateAction *paction)
 564 {
 565         struct registry_key *key = parent;
 566         struct registry_key *create_parent;
 567         TALLOC_CTX *mem_ctx;
 568         char *path, *end;
 569         WERROR err;
 570
 571         mem_ctx = talloc_new(ctx);
 572         if (mem_ctx == NULL) {
 573                 return WERR_NOMEM;
 574         }
 575
 576         path = talloc_strdup(mem_ctx, subkeypath);
 577         if (path == NULL) {
 578                 err = WERR_NOMEM;
 579                 goto done;
 580         }
 581
 582         err = regdb_transaction_start();
 583         if (!W_ERROR_IS_OK(err)) {
 584                 DEBUG(0, ("reg_createkey: failed to start transaction: %s\n",
 585                           win_errstr(err)));
 586                 goto done;
 587         }
 588
 589         while ((end = strchr(path, '\\')) != NULL) {
 590                 struct registry_key *tmp;
 591                 enum winreg_CreateAction action;
 592
 593                 *end = '\0';
 594
 595                 err = reg_createkey(mem_ctx, key, path,
 596                                     KEY_ENUMERATE_SUB_KEYS, &tmp, &action);
 597                 if (!W_ERROR_IS_OK(err)) {
 598                         goto trans_done;
 599                 }
 600
 601                 if (key != parent) {
 602                         TALLOC_FREE(key);
 603                 }
 604
 605                 key = tmp;
 606                 path = end+1;
 607         }
 608
 609         /*
 610          * At this point, "path" contains the one-element subkey of "key". We
 611          * can try to open it.
 612          */
 613
 614         err = reg_openkey(ctx, key, path, desired_access, pkey);
 615         if (W_ERROR_IS_OK(err)) {
 616                 if (paction != NULL) {
 617                         *paction = REG_OPENED_EXISTING_KEY;
 618                 }
 619                 goto trans_done;
 620         }
 621
 622         if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
 623                 /*
 624                  * Something but "notfound" has happened, so bail out
 625                  */
 626                 goto trans_done;
 627         }
 628
 629         /*
 630          * We have to make a copy of the current key, as we opened it only
 631          * with ENUM_SUBKEY access.
 632          */
 633
 634         err = reg_openkey(mem_ctx, key, "", KEY_CREATE_SUB_KEY,
 635                           &create_parent);
 636         if (!W_ERROR_IS_OK(err)) {
 637                 goto trans_done;
 638         }
 639
 640         /*
 641          * Actually create the subkey
 642          */
 643
 644         err = fill_subkey_cache(create_parent);
 645         if (!W_ERROR_IS_OK(err)) {
 646                 goto trans_done;
 647         }
 648
 649         err = create_reg_subkey(key->key, path);
 650         if (!W_ERROR_IS_OK(err)) {
 651                 goto trans_done;
 652         }
 653
 654         /*
 655          * Now open the newly created key
 656          */
 657
 658         err = reg_openkey(ctx, create_parent, path, desired_access, pkey);
 659         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 660                 *paction = REG_CREATED_NEW_KEY;
 661         }
 662
 663 trans_done:
 664         if (W_ERROR_IS_OK(err)) {
 665                 err = regdb_transaction_commit();
 666                 if (!W_ERROR_IS_OK(err)) {
 667                         DEBUG(0, ("reg_createkey: Error committing transaction: %s\n", win_errstr(err)));
 668                 }
 669         } else {
 670                 WERROR err1 = regdb_transaction_cancel();
 671                 if (!W_ERROR_IS_OK(err1)) {
 672                         DEBUG(0, ("reg_createkey: Error cancelling transaction: %s\n", win_errstr(err1)));
 673                 }
 674         }
 675
 676  done:
 677         TALLOC_FREE(mem_ctx);
 678         return err;
 679 }
 680
 681 static WERROR reg_deletekey_internal(TALLOC_CTX *mem_ctx,
 682                                      struct registry_key *parent,
 683                                      const char *path, bool lazy)
 684 {
 685         WERROR err;
 686         char *name, *end;
 687         struct registry_key *key;
 688         name = talloc_strdup(mem_ctx, path);
 689         if (name == NULL) {
 690                 err = WERR_NOMEM;
 691                 goto done;
 692         }
 693
 694         /* no subkeys - proceed with delete */
 695         end = strrchr(name, '\\');
 696         if (end != NULL) {
 697                 *end = '\0';
 698
 699                 err = reg_openkey(mem_ctx, parent, name,
 700                                   KEY_CREATE_SUB_KEY, &key);
 701                 W_ERROR_NOT_OK_GOTO_DONE(err);
 702
 703                 parent = key;
 704                 name = end+1;
 705         }
 706
 707         if (name[0] == '\0') {
 708                 err = WERR_INVALID_PARAM;
 709                 goto done;
 710         }
 711
 712         err = delete_reg_subkey(parent->key, name, lazy);
 713
 714 done:
 715         return err;
 716 }
 717
 718 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 719 {
 720         WERROR err;
 721         struct registry_key *key;
 722         TALLOC_CTX *mem_ctx = talloc_stackframe();
 723
 724         /* check if the key has subkeys */
 725         err = reg_openkey(mem_ctx, parent, path, REG_KEY_READ, &key);
 726         W_ERROR_NOT_OK_GOTO_DONE(err);
 727
 728         err = regdb_transaction_start();
 729         if (!W_ERROR_IS_OK(err)) {
 730                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 731                           win_errstr(err)));
 732                 goto done;
 733         }
 734
 735         err = fill_subkey_cache(key);
 736         if (!W_ERROR_IS_OK(err)) {
 737                 goto trans_done;
 738         }
 739
 740         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 741                 err = WERR_ACCESS_DENIED;
 742                 goto trans_done;
 743         }
 744         err = reg_deletekey_internal(mem_ctx, parent, path, false);
 745
 746 trans_done:
 747         if (W_ERROR_IS_OK(err)) {
 748                 err = regdb_transaction_commit();
 749                 if (!W_ERROR_IS_OK(err)) {
 750                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 751                 }
 752         } else {
 753                 WERROR err1 = regdb_transaction_cancel();
 754                 if (!W_ERROR_IS_OK(err1)) {
 755                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 756                 }
 757         }
 758
 759 done:
 760         TALLOC_FREE(mem_ctx);
 761         return err;
 762 }
 763
 764
 765 WERROR reg_setvalue(struct registry_key *key, const char *name,
 766                     const struct registry_value *val)
 767 {
 768         struct regval_blob *existing;
 769         WERROR err;
 770         int res;
 771
 772         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 773                 return WERR_ACCESS_DENIED;
 774         }
 775
 776         err = regdb_transaction_start();
 777         if (!W_ERROR_IS_OK(err)) {
 778                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 779                           win_errstr(err)));
 780                 return err;
 781         }
 782
 783         err = fill_value_cache(key);
 784         if (!W_ERROR_IS_OK(err)) {
 785                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 786                 goto done;
 787         }
 788
 789         existing = regval_ctr_getvalue(key->values, name);
 790
 791         if ((existing != NULL) &&
 792             (regval_size(existing) == val->data.length) &&
 793             (memcmp(regval_data_p(existing), val->data.data,
 794                     val->data.length) == 0))
 795         {
 796                 err = WERR_OK;
 797                 goto done;
 798         }
 799
 800         res = regval_ctr_addvalue(key->values, name, val->type,
 801                                   val->data.data, val->data.length);
 802
 803         if (res == 0) {
 804                 TALLOC_FREE(key->values);
 805                 err = WERR_NOMEM;
 806                 goto done;
 807         }
 808
 809         if (!store_reg_values(key->key, key->values)) {
 810                 TALLOC_FREE(key->values);
 811                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 812                 err = WERR_REG_IO_FAILURE;
 813                 goto done;
 814         }
 815
 816         err = WERR_OK;
 817
 818 done:
 819         if (W_ERROR_IS_OK(err)) {
 820                 err = regdb_transaction_commit();
 821                 if (!W_ERROR_IS_OK(err)) {
 822                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 823                 }
 824         } else {
 825                 WERROR err1 = regdb_transaction_cancel();
 826                 if (!W_ERROR_IS_OK(err1)) {
 827                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 828                 }
 829         }
 830
 831         return err;
 832 }
 833
 834 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 835 {
 836         struct regval_blob *blob;
 837
 838         blob = regval_ctr_getvalue(key->values, name);
 839
 840         if (blob == NULL) {
 841                 return WERR_BADFILE;
 842         } else {
 843                 return WERR_OK;
 844         }
 845 }
 846
 847 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 848 {
 849         WERROR err;
 850
 851         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 852                 return WERR_ACCESS_DENIED;
 853         }
 854
 855         err = regdb_transaction_start();
 856         if (!W_ERROR_IS_OK(err)) {
 857                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 858                           win_errstr(err)));
 859                 return err;
 860         }
 861
 862         err = fill_value_cache(key);
 863         if (!W_ERROR_IS_OK(err)) {
 864                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 865                           win_errstr(err)));
 866                 goto done;
 867         }
 868
 869         err = reg_value_exists(key, name);
 870         if (!W_ERROR_IS_OK(err)) {
 871                 goto done;
 872         }
 873
 874         regval_ctr_delvalue(key->values, name);
 875
 876         if (!store_reg_values(key->key, key->values)) {
 877                 TALLOC_FREE(key->values);
 878                 err = WERR_REG_IO_FAILURE;
 879                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 880                 goto done;
 881         }
 882
 883         err = WERR_OK;
 884
 885 done:
 886         if (W_ERROR_IS_OK(err)) {
 887                 err = regdb_transaction_commit();
 888                 if (!W_ERROR_IS_OK(err)) {
 889                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 890                 }
 891         } else {
 892                 WERROR err1 = regdb_transaction_cancel();
 893                 if (!W_ERROR_IS_OK(err1)) {
 894                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 895                 }
 896         }
 897
 898         return err;
 899 }
 900
 901 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 902                           struct security_descriptor **psecdesc)
 903 {
 904         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 905 }
 906
 907 WERROR reg_setkeysecurity(struct registry_key *key,
 908                           struct security_descriptor *psecdesc)
 909 {
 910         return regkey_set_secdesc(key->key, psecdesc);
 911 }
 912
 913 WERROR reg_getversion(uint32_t *version)
 914 {
 915         if (version == NULL) {
 916                 return WERR_INVALID_PARAM;
 917         }
 918
 919         *version = 0x00000005; /* Windows 2000 registry API version */
 920         return WERR_OK;
 921 }
 922
 923 /**********************************************************************
 924  * Higher level utility functions
 925  **********************************************************************/
 926
 927 WERROR reg_deleteallvalues(struct registry_key *key)
 928 {
 929         WERROR err;
 930         int i;
 931
 932         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 933                 return WERR_ACCESS_DENIED;
 934         }
 935
 936         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 937                 return err;
 938         }
 939
 940         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 941                 struct regval_blob *blob;
 942                 blob = regval_ctr_specific_value(key->values, i);
 943                 regval_ctr_delvalue(key->values, regval_name(blob));
 944         }
 945
 946         if (!store_reg_values(key->key, key->values)) {
 947                 TALLOC_FREE(key->values);
 948                 return WERR_REG_IO_FAILURE;
 949         }
 950
 951         return WERR_OK;
 952 }
 953
 954 /*
 955  * Utility function to delete a registry key with all its subkeys.
 956  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 957  * key that has subkeys.
 958  */
 959 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 960                                                const char *path,
 961                                                bool del_key, bool lazy)
 962 {
 963         WERROR werr = WERR_OK;
 964         struct registry_key *key;
 965         char *subkey_name = NULL;
 966         uint32 i;
 967         TALLOC_CTX *mem_ctx = talloc_stackframe();
 968
 969         DEBUG(5, ("reg_deletekey_recursive_internal: deleting '%s' from '%s'\n",
 970                   path, parent->key->name));
 971
 972         /* recurse through subkeys first */
 973         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 974         if (!W_ERROR_IS_OK(werr)) {
 975                 DEBUG(3, ("reg_deletekey_recursive_internal: error opening "
 976                           "subkey '%s' of '%s': '%s'\n",
 977                           path, parent->key->name, win_errstr(werr)));
 978                 goto done;
 979         }
 980
 981         werr = fill_subkey_cache(key);
 982         W_ERROR_NOT_OK_GOTO_DONE(werr);
 983
 984         /*
 985          * loop from top to bottom for perfomance:
 986          * this way, we need to rehash the regsubkey containers less
 987          */
 988         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 989                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 990                 werr = reg_deletekey_recursive_internal(key, subkey_name, true, del_key);
 991                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 992         }
 993
 994         if (del_key) {
 995                 /* now delete the actual key */
 996                 werr = reg_deletekey_internal(mem_ctx, parent, path, lazy);
 997         }
 998
 999 done:
1000
1001         DEBUG(5, ("reg_deletekey_recursive_internal: done deleting '%s' from "
1002                   "'%s': %s\n",
1003                   path, parent->key->name, win_errstr(werr)));
1004         TALLOC_FREE(mem_ctx);
1005         return werr;
1006 }
1007
1008 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
1009                                             const char *path,
1010                                             bool del_key)
1011 {
1012         WERROR werr;
1013
1014         werr = regdb_transaction_start();
1015         if (!W_ERROR_IS_OK(werr)) {
1016                 DEBUG(0, ("reg_deletekey_recursive_trans: "
1017                           "error starting transaction: %s\n",
1018                           win_errstr(werr)));
1019                 return werr;
1020         }
1021
1022         werr = reg_deletekey_recursive_internal(parent, path, del_key, false);
1023
1024         if (!W_ERROR_IS_OK(werr)) {
1025                 WERROR werr2;
1026
1027                 DEBUG(1, (__location__ " failed to delete key '%s' from key "
1028                           "'%s': %s\n", path, parent->key->name,
1029                           win_errstr(werr)));
1030
1031                 werr2 = regdb_transaction_cancel();
1032                 if (!W_ERROR_IS_OK(werr2)) {
1033                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1034                                   "error cancelling transaction: %s\n",
1035                                   win_errstr(werr2)));
1036                         /*
1037                          * return the original werr or the
1038                          * error from cancelling the transaction?
1039                          */
1040                 }
1041         } else {
1042                 werr = regdb_transaction_commit();
1043                 if (!W_ERROR_IS_OK(werr)) {
1044                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1045                                   "error committing transaction: %s\n",
1046                                   win_errstr(werr)));
1047                 } else {
1048                         DEBUG(5, ("reg_reletekey_recursive_trans: deleted key '%s' from '%s'\n",
1049                                   path, parent->key->name));
1050
1051                 }
1052         }
1053
1054         return werr;
1055 }
1056
1057 WERROR reg_deletekey_recursive(struct registry_key *parent,
1058                                const char *path)
1059 {
1060         return reg_deletekey_recursive_trans(parent, path, true);
1061 }
1062
1063 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1064                                    const char *path)
1065 {
1066         return reg_deletekey_recursive_trans(parent, path, false);
1067 }
1068