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         werr = regsubkey_ctr_init(key, &(key->subkeys));
 115         W_ERROR_NOT_OK_RETURN(werr);
 116
 117         if (fetch_reg_keys(key->key, key->subkeys) == -1) {
 118                 TALLOC_FREE(key->subkeys);
 119                 return WERR_NO_MORE_ITEMS;
 120         }
 121
 122         return WERR_OK;
 123 }
 124
 125 static int regkey_destructor(struct registry_key_handle *key)
 126 {
 127         return regdb_close();
 128 }
 129
 130 static WERROR regkey_open_onelevel(TALLOC_CTX *mem_ctx,
 131                                    struct registry_key *parent,
 132                                    const char *name,
 133                                    const struct security_token *token,
 134                                    uint32 access_desired,
 135                                    struct registry_key **pregkey)
 136 {
 137         WERROR          result = WERR_OK;
 138         struct registry_key *regkey;
 139         struct registry_key_handle *key;
 140         struct regsubkey_ctr    *subkeys = NULL;
 141
 142         DEBUG(7,("regkey_open_onelevel: name = [%s]\n", name));
 143
 144         SMB_ASSERT(strchr(name, '\\') == NULL);
 145
 146         if (!(regkey = TALLOC_ZERO_P(mem_ctx, struct registry_key)) ||
 147             !(regkey->token = dup_nt_token(regkey, token)) ||
 148             !(regkey->key = TALLOC_ZERO_P(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(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         /* check if the path really exists; failed is indicated by -1 */
 207         /* if the subkey count failed, bail out */
 208
 209         result = regsubkey_ctr_init(key, &subkeys);
 210         if (!W_ERROR_IS_OK(result)) {
 211                 goto done;
 212         }
 213
 214         if ( fetch_reg_keys( key, subkeys ) == -1 )  {
 215                 result = WERR_BADFILE;
 216                 goto done;
 217         }
 218
 219         TALLOC_FREE( subkeys );
 220
 221         if ( !regkey_access_check( key, access_desired, &key->access_granted,
 222                                    token ) ) {
 223                 result = WERR_ACCESS_DENIED;
 224                 goto done;
 225         }
 226
 227         *pregkey = regkey;
 228         result = WERR_OK;
 229
 230 done:
 231         if ( !W_ERROR_IS_OK(result) ) {
 232                 TALLOC_FREE(regkey);
 233         }
 234
 235         return result;
 236 }
 237
 238 WERROR reg_openhive(TALLOC_CTX *mem_ctx, const char *hive,
 239                     uint32 desired_access,
 240                     const struct security_token *token,
 241                     struct registry_key **pkey)
 242 {
 243         SMB_ASSERT(hive != NULL);
 244         SMB_ASSERT(hive[0] != '\0');
 245         SMB_ASSERT(strchr(hive, '\\') == NULL);
 246
 247         return regkey_open_onelevel(mem_ctx, NULL, hive, token, desired_access,
 248                                     pkey);
 249 }
 250
 251
 252 /**********************************************************************
 253  * The API functions
 254  **********************************************************************/
 255
 256 WERROR reg_openkey(TALLOC_CTX *mem_ctx, struct registry_key *parent,
 257                    const char *name, uint32 desired_access,
 258                    struct registry_key **pkey)
 259 {
 260         struct registry_key *direct_parent = parent;
 261         WERROR err;
 262         char *p, *path;
 263         size_t len;
 264         TALLOC_CTX *frame = talloc_stackframe();
 265
 266         path = talloc_strdup(frame, name);
 267         if (path == NULL) {
 268                 err = WERR_NOMEM;
 269                 goto error;
 270         }
 271
 272         len = strlen(path);
 273
 274         if ((len > 0) && (path[len-1] == '\\')) {
 275                 path[len-1] = '\0';
 276         }
 277
 278         while ((p = strchr(path, '\\')) != NULL) {
 279                 char *name_component;
 280                 struct registry_key *tmp;
 281
 282                 name_component = talloc_strndup(frame, path, (p - path));
 283                 if (name_component == NULL) {
 284                         err = WERR_NOMEM;
 285                         goto error;
 286                 }
 287
 288                 err = regkey_open_onelevel(frame, direct_parent,
 289                                            name_component, parent->token,
 290                                            KEY_ENUMERATE_SUB_KEYS, &tmp);
 291
 292                 if (!W_ERROR_IS_OK(err)) {
 293                         goto error;
 294                 }
 295
 296                 direct_parent = tmp;
 297                 path = p+1;
 298         }
 299
 300         err = regkey_open_onelevel(mem_ctx, direct_parent, path, parent->token,
 301                                    desired_access, pkey);
 302
 303 error:
 304         talloc_free(frame);
 305         return err;
 306 }
 307
 308 WERROR reg_enumkey(TALLOC_CTX *mem_ctx, struct registry_key *key,
 309                    uint32 idx, char **name, NTTIME *last_write_time)
 310 {
 311         WERROR err;
 312
 313         if (!(key->key->access_granted & KEY_ENUMERATE_SUB_KEYS)) {
 314                 return WERR_ACCESS_DENIED;
 315         }
 316
 317         if (!W_ERROR_IS_OK(err = fill_subkey_cache(key))) {
 318                 return err;
 319         }
 320
 321         if (idx >= regsubkey_ctr_numkeys(key->subkeys)) {
 322                 return WERR_NO_MORE_ITEMS;
 323         }
 324
 325         if (!(*name = talloc_strdup(mem_ctx,
 326                         regsubkey_ctr_specific_key(key->subkeys, idx))))
 327         {
 328                 return WERR_NOMEM;
 329         }
 330
 331         if (last_write_time) {
 332                 *last_write_time = 0;
 333         }
 334
 335         return WERR_OK;
 336 }
 337
 338 WERROR reg_enumvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 339                      uint32 idx, char **pname, struct registry_value **pval)
 340 {
 341         struct registry_value *val;
 342         struct regval_blob *blob;
 343         WERROR err;
 344
 345         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 346                 return WERR_ACCESS_DENIED;
 347         }
 348
 349         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 350                 return err;
 351         }
 352
 353         if (idx >= regval_ctr_numvals(key->values)) {
 354                 return WERR_NO_MORE_ITEMS;
 355         }
 356
 357         blob = regval_ctr_specific_value(key->values, idx);
 358
 359         val = talloc_zero(mem_ctx, struct registry_value);
 360         if (val == NULL) {
 361                 return WERR_NOMEM;
 362         }
 363
 364         val->type = regval_type(blob);
 365         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 366
 367         if (pname
 368             && !(*pname = talloc_strdup(
 369                          mem_ctx, regval_name(blob)))) {
 370                 TALLOC_FREE(val);
 371                 return WERR_NOMEM;
 372         }
 373
 374         *pval = val;
 375         return WERR_OK;
 376 }
 377
 378 static WERROR reg_enumvalue_nocachefill(TALLOC_CTX *mem_ctx,
 379                                         struct registry_key *key,
 380                                         uint32 idx, char **pname,
 381                                         struct registry_value **pval)
 382 {
 383         struct registry_value *val;
 384         struct regval_blob *blob;
 385
 386         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 387                 return WERR_ACCESS_DENIED;
 388         }
 389
 390         if (idx >= regval_ctr_numvals(key->values)) {
 391                 return WERR_NO_MORE_ITEMS;
 392         }
 393
 394         blob = regval_ctr_specific_value(key->values, idx);
 395
 396         val = talloc_zero(mem_ctx, struct registry_value);
 397         if (val == NULL) {
 398                 return WERR_NOMEM;
 399         }
 400
 401         val->type = regval_type(blob);
 402         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 403
 404         if (pname
 405             && !(*pname = talloc_strdup(
 406                          mem_ctx, regval_name(blob)))) {
 407                 TALLOC_FREE(val);
 408                 return WERR_NOMEM;
 409         }
 410
 411         *pval = val;
 412         return WERR_OK;
 413 }
 414
 415 WERROR reg_queryvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 416                       const char *name, struct registry_value **pval)
 417 {
 418         WERROR err;
 419         uint32 i;
 420
 421         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 422                 return WERR_ACCESS_DENIED;
 423         }
 424
 425         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 426                 return err;
 427         }
 428
 429         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 430                 struct regval_blob *blob;
 431                 blob = regval_ctr_specific_value(key->values, i);
 432                 if (strequal(regval_name(blob), name)) {
 433                         /*
 434                          * don't use reg_enumvalue here:
 435                          * re-reading the values from the disk
 436                          * would change the indexing and break
 437                          * this function.
 438                          */
 439                         return reg_enumvalue_nocachefill(mem_ctx, key, i,
 440                                                          NULL, pval);
 441                 }
 442         }
 443
 444         return WERR_BADFILE;
 445 }
 446
 447 WERROR reg_querymultiplevalues(TALLOC_CTX *mem_ctx,
 448                                struct registry_key *key,
 449                                uint32_t num_names,
 450                                const char **names,
 451                                uint32_t *pnum_vals,
 452                                struct registry_value **pvals)
 453 {
 454         WERROR err;
 455         uint32_t i, n, found = 0;
 456         struct registry_value *vals;
 457
 458         if (num_names == 0) {
 459                 return WERR_OK;
 460         }
 461
 462         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 463                 return WERR_ACCESS_DENIED;
 464         }
 465
 466         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 467                 return err;
 468         }
 469
 470         vals = talloc_zero_array(mem_ctx, struct registry_value, num_names);
 471         if (vals == NULL) {
 472                 return WERR_NOMEM;
 473         }
 474
 475         for (n=0; n < num_names; n++) {
 476                 for (i=0; i < regval_ctr_numvals(key->values); i++) {
 477                         struct regval_blob *blob;
 478                         blob = regval_ctr_specific_value(key->values, i);
 479                         if (strequal(regval_name(blob), names[n])) {
 480                                 struct registry_value *v;
 481                                 err = reg_enumvalue(mem_ctx, key, i, NULL, &v);
 482                                 if (!W_ERROR_IS_OK(err)) {
 483                                         return err;
 484                                 }
 485                                 vals[n] = *v;
 486                                 found++;
 487                         }
 488                 }
 489         }
 490
 491         *pvals = vals;
 492         *pnum_vals = found;
 493
 494         return WERR_OK;
 495 }
 496
 497 WERROR reg_queryinfokey(struct registry_key *key, uint32_t *num_subkeys,
 498                         uint32_t *max_subkeylen, uint32_t *max_subkeysize,
 499                         uint32_t *num_values, uint32_t *max_valnamelen,
 500                         uint32_t *max_valbufsize, uint32_t *secdescsize,
 501                         NTTIME *last_changed_time)
 502 {
 503         uint32 i, max_size;
 504         size_t max_len;
 505         TALLOC_CTX *mem_ctx;
 506         WERROR err;
 507         struct security_descriptor *secdesc;
 508
 509         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 510                 return WERR_ACCESS_DENIED;
 511         }
 512
 513         if (!W_ERROR_IS_OK(fill_subkey_cache(key)) ||
 514             !W_ERROR_IS_OK(fill_value_cache(key))) {
 515                 return WERR_BADFILE;
 516         }
 517
 518         max_len = 0;
 519         for (i=0; i< regsubkey_ctr_numkeys(key->subkeys); i++) {
 520                 max_len = MAX(max_len,
 521                         strlen(regsubkey_ctr_specific_key(key->subkeys, i)));
 522         }
 523
 524         *num_subkeys = regsubkey_ctr_numkeys(key->subkeys);
 525         *max_subkeylen = max_len;
 526         *max_subkeysize = 0;    /* Class length? */
 527
 528         max_len = 0;
 529         max_size = 0;
 530         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 531                 struct regval_blob *blob;
 532                 blob = regval_ctr_specific_value(key->values, i);
 533                 max_len = MAX(max_len, strlen(regval_name(blob)));
 534                 max_size = MAX(max_size, regval_size(blob));
 535         }
 536
 537         *num_values = regval_ctr_numvals(key->values);
 538         *max_valnamelen = max_len;
 539         *max_valbufsize = max_size;
 540
 541         if (!(mem_ctx = talloc_new(key))) {
 542                 return WERR_NOMEM;
 543         }
 544
 545         err = regkey_get_secdesc(mem_ctx, key->key, &secdesc);
 546         if (!W_ERROR_IS_OK(err)) {
 547                 TALLOC_FREE(mem_ctx);
 548                 return err;
 549         }
 550
 551         *secdescsize = ndr_size_security_descriptor(secdesc, 0);
 552         TALLOC_FREE(mem_ctx);
 553
 554         *last_changed_time = 0;
 555
 556         return WERR_OK;
 557 }
 558
 559 WERROR reg_createkey(TALLOC_CTX *ctx, struct registry_key *parent,
 560                      const char *subkeypath, uint32 desired_access,
 561                      struct registry_key **pkey,
 562                      enum winreg_CreateAction *paction)
 563 {
 564         struct registry_key *key = parent;
 565         struct registry_key *create_parent;
 566         TALLOC_CTX *mem_ctx;
 567         char *path, *end;
 568         WERROR err;
 569
 570         mem_ctx = talloc_new(ctx);
 571         if (mem_ctx == NULL) {
 572                 return WERR_NOMEM;
 573         }
 574
 575         path = talloc_strdup(mem_ctx, subkeypath);
 576         if (path == NULL) {
 577                 err = WERR_NOMEM;
 578                 goto done;
 579         }
 580
 581         err = regdb_transaction_start();
 582         if (!W_ERROR_IS_OK(err)) {
 583                 DEBUG(0, ("reg_createkey: failed to start transaction: %s\n",
 584                           win_errstr(err)));
 585                 goto done;
 586         }
 587
 588         while ((end = strchr(path, '\\')) != NULL) {
 589                 struct registry_key *tmp;
 590                 enum winreg_CreateAction action;
 591
 592                 *end = '\0';
 593
 594                 err = reg_createkey(mem_ctx, key, path,
 595                                     KEY_ENUMERATE_SUB_KEYS, &tmp, &action);
 596                 if (!W_ERROR_IS_OK(err)) {
 597                         goto trans_done;
 598                 }
 599
 600                 if (key != parent) {
 601                         TALLOC_FREE(key);
 602                 }
 603
 604                 key = tmp;
 605                 path = end+1;
 606         }
 607
 608         /*
 609          * At this point, "path" contains the one-element subkey of "key". We
 610          * can try to open it.
 611          */
 612
 613         err = reg_openkey(ctx, key, path, desired_access, pkey);
 614         if (W_ERROR_IS_OK(err)) {
 615                 if (paction != NULL) {
 616                         *paction = REG_OPENED_EXISTING_KEY;
 617                 }
 618                 goto trans_done;
 619         }
 620
 621         if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
 622                 /*
 623                  * Something but "notfound" has happened, so bail out
 624                  */
 625                 goto trans_done;
 626         }
 627
 628         /*
 629          * We have to make a copy of the current key, as we opened it only
 630          * with ENUM_SUBKEY access.
 631          */
 632
 633         err = reg_openkey(mem_ctx, key, "", KEY_CREATE_SUB_KEY,
 634                           &create_parent);
 635         if (!W_ERROR_IS_OK(err)) {
 636                 goto trans_done;
 637         }
 638
 639         /*
 640          * Actually create the subkey
 641          */
 642
 643         err = fill_subkey_cache(create_parent);
 644         if (!W_ERROR_IS_OK(err)) {
 645                 goto trans_done;
 646         }
 647
 648         err = create_reg_subkey(key->key, path);
 649         if (!W_ERROR_IS_OK(err)) {
 650                 goto trans_done;
 651         }
 652
 653         /*
 654          * Now open the newly created key
 655          */
 656
 657         err = reg_openkey(ctx, create_parent, path, desired_access, pkey);
 658         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 659                 *paction = REG_CREATED_NEW_KEY;
 660         }
 661
 662 trans_done:
 663         if (W_ERROR_IS_OK(err)) {
 664                 err = regdb_transaction_commit();
 665                 if (!W_ERROR_IS_OK(err)) {
 666                         DEBUG(0, ("reg_createkey: Error committing transaction: %s\n", win_errstr(err)));
 667                 }
 668         } else {
 669                 WERROR err1 = regdb_transaction_cancel();
 670                 if (!W_ERROR_IS_OK(err1)) {
 671                         DEBUG(0, ("reg_createkey: Error cancelling transaction: %s\n", win_errstr(err1)));
 672                 }
 673         }
 674
 675  done:
 676         TALLOC_FREE(mem_ctx);
 677         return err;
 678 }
 679
 680 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 681 {
 682         WERROR err;
 683         char *name, *end;
 684         struct registry_key *tmp_key, *key;
 685         TALLOC_CTX *mem_ctx = talloc_stackframe();
 686
 687         name = talloc_strdup(mem_ctx, path);
 688         if (name == NULL) {
 689                 err = WERR_NOMEM;
 690                 goto done;
 691         }
 692
 693         /* check if the key has subkeys */
 694         err = reg_openkey(mem_ctx, parent, name, REG_KEY_READ, &key);
 695         W_ERROR_NOT_OK_GOTO_DONE(err);
 696
 697         err = regdb_transaction_start();
 698         if (!W_ERROR_IS_OK(err)) {
 699                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 700                           win_errstr(err)));
 701                 goto done;
 702         }
 703
 704         err = fill_subkey_cache(key);
 705         W_ERROR_NOT_OK_GOTO(err, trans_done);
 706
 707         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 708                 err = WERR_ACCESS_DENIED;
 709                 goto trans_done;
 710         }
 711
 712         /* no subkeys - proceed with delete */
 713         end = strrchr(name, '\\');
 714         if (end != NULL) {
 715                 *end = '\0';
 716
 717                 err = reg_openkey(mem_ctx, parent, name,
 718                                   KEY_CREATE_SUB_KEY, &tmp_key);
 719                 W_ERROR_NOT_OK_GOTO(err, trans_done);
 720
 721                 parent = tmp_key;
 722                 name = end+1;
 723         }
 724
 725         if (name[0] == '\0') {
 726                 err = WERR_INVALID_PARAM;
 727                 goto trans_done;
 728         }
 729
 730         err = delete_reg_subkey(parent->key, name);
 731
 732 trans_done:
 733         if (W_ERROR_IS_OK(err)) {
 734                 err = regdb_transaction_commit();
 735                 if (!W_ERROR_IS_OK(err)) {
 736                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 737                 }
 738         } else {
 739                 WERROR err1 = regdb_transaction_cancel();
 740                 if (!W_ERROR_IS_OK(err1)) {
 741                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 742                 }
 743         }
 744
 745 done:
 746         TALLOC_FREE(mem_ctx);
 747         return err;
 748 }
 749
 750 WERROR reg_setvalue(struct registry_key *key, const char *name,
 751                     const struct registry_value *val)
 752 {
 753         struct regval_blob *existing;
 754         WERROR err;
 755         int res;
 756
 757         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 758                 return WERR_ACCESS_DENIED;
 759         }
 760
 761         err = regdb_transaction_start();
 762         if (!W_ERROR_IS_OK(err)) {
 763                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 764                           win_errstr(err)));
 765                 return err;
 766         }
 767
 768         err = fill_value_cache(key);
 769         if (!W_ERROR_IS_OK(err)) {
 770                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 771                 goto done;
 772         }
 773
 774         existing = regval_ctr_getvalue(key->values, name);
 775
 776         if ((existing != NULL) &&
 777             (regval_size(existing) == val->data.length) &&
 778             (memcmp(regval_data_p(existing), val->data.data,
 779                     val->data.length) == 0))
 780         {
 781                 err = WERR_OK;
 782                 goto done;
 783         }
 784
 785         res = regval_ctr_addvalue(key->values, name, val->type,
 786                                   val->data.data, val->data.length);
 787
 788         if (res == 0) {
 789                 TALLOC_FREE(key->values);
 790                 err = WERR_NOMEM;
 791                 goto done;
 792         }
 793
 794         if (!store_reg_values(key->key, key->values)) {
 795                 TALLOC_FREE(key->values);
 796                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 797                 err = WERR_REG_IO_FAILURE;
 798                 goto done;
 799         }
 800
 801         err = WERR_OK;
 802
 803 done:
 804         if (W_ERROR_IS_OK(err)) {
 805                 err = regdb_transaction_commit();
 806                 if (!W_ERROR_IS_OK(err)) {
 807                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 808                 }
 809         } else {
 810                 WERROR err1 = regdb_transaction_cancel();
 811                 if (!W_ERROR_IS_OK(err1)) {
 812                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 813                 }
 814         }
 815
 816         return err;
 817 }
 818
 819 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 820 {
 821         struct regval_blob *blob;
 822
 823         blob = regval_ctr_getvalue(key->values, name);
 824
 825         if (blob == NULL) {
 826                 return WERR_BADFILE;
 827         } else {
 828                 return WERR_OK;
 829         }
 830 }
 831
 832 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 833 {
 834         WERROR err;
 835
 836         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 837                 return WERR_ACCESS_DENIED;
 838         }
 839
 840         err = regdb_transaction_start();
 841         if (!W_ERROR_IS_OK(err)) {
 842                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 843                           win_errstr(err)));
 844                 return err;
 845         }
 846
 847         err = fill_value_cache(key);
 848         if (!W_ERROR_IS_OK(err)) {
 849                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 850                           win_errstr(err)));
 851                 goto done;
 852         }
 853
 854         err = reg_value_exists(key, name);
 855         if (!W_ERROR_IS_OK(err)) {
 856                 goto done;
 857         }
 858
 859         regval_ctr_delvalue(key->values, name);
 860
 861         if (!store_reg_values(key->key, key->values)) {
 862                 TALLOC_FREE(key->values);
 863                 err = WERR_REG_IO_FAILURE;
 864                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 865                 goto done;
 866         }
 867
 868         err = WERR_OK;
 869
 870 done:
 871         if (W_ERROR_IS_OK(err)) {
 872                 err = regdb_transaction_commit();
 873                 if (!W_ERROR_IS_OK(err)) {
 874                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 875                 }
 876         } else {
 877                 WERROR err1 = regdb_transaction_cancel();
 878                 if (!W_ERROR_IS_OK(err1)) {
 879                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 880                 }
 881         }
 882
 883         return err;
 884 }
 885
 886 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 887                           struct security_descriptor **psecdesc)
 888 {
 889         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 890 }
 891
 892 WERROR reg_setkeysecurity(struct registry_key *key,
 893                           struct security_descriptor *psecdesc)
 894 {
 895         return regkey_set_secdesc(key->key, psecdesc);
 896 }
 897
 898 WERROR reg_getversion(uint32_t *version)
 899 {
 900         if (version == NULL) {
 901                 return WERR_INVALID_PARAM;
 902         }
 903
 904         *version = 0x00000005; /* Windows 2000 registry API version */
 905         return WERR_OK;
 906 }
 907
 908 /**********************************************************************
 909  * Higher level utility functions
 910  **********************************************************************/
 911
 912 WERROR reg_deleteallvalues(struct registry_key *key)
 913 {
 914         WERROR err;
 915         int i;
 916
 917         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 918                 return WERR_ACCESS_DENIED;
 919         }
 920
 921         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 922                 return err;
 923         }
 924
 925         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 926                 struct regval_blob *blob;
 927                 blob = regval_ctr_specific_value(key->values, i);
 928                 regval_ctr_delvalue(key->values, regval_name(blob));
 929         }
 930
 931         if (!store_reg_values(key->key, key->values)) {
 932                 TALLOC_FREE(key->values);
 933                 return WERR_REG_IO_FAILURE;
 934         }
 935
 936         return WERR_OK;
 937 }
 938
 939 /*
 940  * Utility function to delete a registry key with all its subkeys.
 941  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 942  * key that has subkeys.
 943  */
 944 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 945                                                const char *path,
 946                                                bool del_key)
 947 {
 948         WERROR werr = WERR_OK;
 949         struct registry_key *key;
 950         char *subkey_name = NULL;
 951         uint32 i;
 952         TALLOC_CTX *mem_ctx = talloc_stackframe();
 953
 954         /* recurse through subkeys first */
 955         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 956         if (!W_ERROR_IS_OK(werr)) {
 957                 goto done;
 958         }
 959
 960         werr = fill_subkey_cache(key);
 961         W_ERROR_NOT_OK_GOTO_DONE(werr);
 962
 963         /*
 964          * loop from top to bottom for perfomance:
 965          * this way, we need to rehash the regsubkey containers less
 966          */
 967         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 968                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 969                 werr = reg_deletekey_recursive_internal(key, subkey_name, true);
 970                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 971         }
 972
 973         if (del_key) {
 974                 /* now delete the actual key */
 975                 werr = reg_deletekey(parent, path);
 976         }
 977
 978 done:
 979         TALLOC_FREE(mem_ctx);
 980         return werr;
 981 }
 982
 983 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
 984                                             const char *path,
 985                                             bool del_key)
 986 {
 987         WERROR werr;
 988
 989         werr = regdb_transaction_start();
 990         if (!W_ERROR_IS_OK(werr)) {
 991                 DEBUG(0, ("reg_deletekey_recursive_trans: "
 992                           "error starting transaction: %s\n",
 993                           win_errstr(werr)));
 994                 return werr;
 995         }
 996
 997         werr = reg_deletekey_recursive_internal(parent, path, del_key);
 998
 999         if (!W_ERROR_IS_OK(werr)) {
1000                 WERROR werr2;
1001
1002                 DEBUG(1, (__location__ " failed to delete key '%s' from key "
1003                           "'%s': %s\n", path, parent->key->name,
1004                           win_errstr(werr)));
1005
1006                 werr2 = regdb_transaction_cancel();
1007                 if (!W_ERROR_IS_OK(werr2)) {
1008                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1009                                   "error cancelling transaction: %s\n",
1010                                   win_errstr(werr2)));
1011                         /*
1012                          * return the original werr or the
1013                          * error from cancelling the transaction?
1014                          */
1015                 }
1016         } else {
1017                 werr = regdb_transaction_commit();
1018                 if (!W_ERROR_IS_OK(werr)) {
1019                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1020                                   "error committing transaction: %s\n",
1021                                   win_errstr(werr)));
1022                 }
1023         }
1024
1025         return werr;
1026 }
1027
1028 WERROR reg_deletekey_recursive(struct registry_key *parent,
1029                                const char *path)
1030 {
1031         return reg_deletekey_recursive_trans(parent, path, true);
1032 }
1033
1034 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1035                                    const char *path)
1036 {
1037         return reg_deletekey_recursive_trans(parent, path, false);
1038 }
1039