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_NO_MORE_ITEMS;
 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, *to_free;
 264         size_t len;
 265
 266         if (!(path = SMB_STRDUP(name))) {
 267                 return WERR_NOMEM;
 268         }
 269         to_free = path;
 270
 271         len = strlen(path);
 272
 273         if ((len > 0) && (path[len-1] == '\\')) {
 274                 path[len-1] = '\0';
 275         }
 276
 277         while ((p = strchr(path, '\\')) != NULL) {
 278                 char *name_component;
 279                 struct registry_key *tmp;
 280
 281                 if (!(name_component = SMB_STRNDUP(path, (p - path)))) {
 282                         err = WERR_NOMEM;
 283                         goto error;
 284                 }
 285
 286                 err = regkey_open_onelevel(mem_ctx, direct_parent,
 287                                            name_component, parent->token,
 288                                            KEY_ENUMERATE_SUB_KEYS, &tmp);
 289                 SAFE_FREE(name_component);
 290
 291                 if (!W_ERROR_IS_OK(err)) {
 292                         goto error;
 293                 }
 294                 if (direct_parent != parent) {
 295                         TALLOC_FREE(direct_parent);
 296                 }
 297
 298                 direct_parent = tmp;
 299                 path = p+1;
 300         }
 301
 302         err = regkey_open_onelevel(mem_ctx, direct_parent, path, parent->token,
 303                                    desired_access, pkey);
 304  error:
 305         if (direct_parent != parent) {
 306                 TALLOC_FREE(direct_parent);
 307         }
 308         SAFE_FREE(to_free);
 309         return err;
 310 }
 311
 312 WERROR reg_enumkey(TALLOC_CTX *mem_ctx, struct registry_key *key,
 313                    uint32 idx, char **name, NTTIME *last_write_time)
 314 {
 315         WERROR err;
 316
 317         if (!(key->key->access_granted & KEY_ENUMERATE_SUB_KEYS)) {
 318                 return WERR_ACCESS_DENIED;
 319         }
 320
 321         if (!W_ERROR_IS_OK(err = fill_subkey_cache(key))) {
 322                 return err;
 323         }
 324
 325         if (idx >= regsubkey_ctr_numkeys(key->subkeys)) {
 326                 return WERR_NO_MORE_ITEMS;
 327         }
 328
 329         if (!(*name = talloc_strdup(mem_ctx,
 330                         regsubkey_ctr_specific_key(key->subkeys, idx))))
 331         {
 332                 return WERR_NOMEM;
 333         }
 334
 335         if (last_write_time) {
 336                 *last_write_time = 0;
 337         }
 338
 339         return WERR_OK;
 340 }
 341
 342 WERROR reg_enumvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 343                      uint32 idx, char **pname, struct registry_value **pval)
 344 {
 345         struct registry_value *val;
 346         struct regval_blob *blob;
 347         WERROR err;
 348
 349         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 350                 return WERR_ACCESS_DENIED;
 351         }
 352
 353         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 354                 return err;
 355         }
 356
 357         if (idx >= regval_ctr_numvals(key->values)) {
 358                 return WERR_NO_MORE_ITEMS;
 359         }
 360
 361         blob = regval_ctr_specific_value(key->values, idx);
 362
 363         val = talloc_zero(mem_ctx, struct registry_value);
 364         if (val == NULL) {
 365                 return WERR_NOMEM;
 366         }
 367
 368         val->type = regval_type(blob);
 369         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 370
 371         if (pname
 372             && !(*pname = talloc_strdup(
 373                          mem_ctx, regval_name(blob)))) {
 374                 TALLOC_FREE(val);
 375                 return WERR_NOMEM;
 376         }
 377
 378         *pval = val;
 379         return WERR_OK;
 380 }
 381
 382 static WERROR reg_enumvalue_nocachefill(TALLOC_CTX *mem_ctx,
 383                                         struct registry_key *key,
 384                                         uint32 idx, char **pname,
 385                                         struct registry_value **pval)
 386 {
 387         struct registry_value *val;
 388         struct regval_blob *blob;
 389
 390         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 391                 return WERR_ACCESS_DENIED;
 392         }
 393
 394         if (idx >= regval_ctr_numvals(key->values)) {
 395                 return WERR_NO_MORE_ITEMS;
 396         }
 397
 398         blob = regval_ctr_specific_value(key->values, idx);
 399
 400         val = talloc_zero(mem_ctx, struct registry_value);
 401         if (val == NULL) {
 402                 return WERR_NOMEM;
 403         }
 404
 405         val->type = regval_type(blob);
 406         val->data = data_blob_talloc(mem_ctx, regval_data_p(blob), regval_size(blob));
 407
 408         if (pname
 409             && !(*pname = talloc_strdup(
 410                          mem_ctx, regval_name(blob)))) {
 411                 TALLOC_FREE(val);
 412                 return WERR_NOMEM;
 413         }
 414
 415         *pval = val;
 416         return WERR_OK;
 417 }
 418
 419 WERROR reg_queryvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 420                       const char *name, struct registry_value **pval)
 421 {
 422         WERROR err;
 423         uint32 i;
 424
 425         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 426                 return WERR_ACCESS_DENIED;
 427         }
 428
 429         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 430                 return err;
 431         }
 432
 433         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 434                 struct regval_blob *blob;
 435                 blob = regval_ctr_specific_value(key->values, i);
 436                 if (strequal(regval_name(blob), name)) {
 437                         /*
 438                          * don't use reg_enumvalue here:
 439                          * re-reading the values from the disk
 440                          * would change the indexing and break
 441                          * this function.
 442                          */
 443                         return reg_enumvalue_nocachefill(mem_ctx, key, i,
 444                                                          NULL, pval);
 445                 }
 446         }
 447
 448         return WERR_BADFILE;
 449 }
 450
 451 WERROR reg_querymultiplevalues(TALLOC_CTX *mem_ctx,
 452                                struct registry_key *key,
 453                                uint32_t num_names,
 454                                const char **names,
 455                                uint32_t *pnum_vals,
 456                                struct registry_value **pvals)
 457 {
 458         WERROR err;
 459         uint32_t i, n, found = 0;
 460         struct registry_value *vals;
 461
 462         if (num_names == 0) {
 463                 return WERR_OK;
 464         }
 465
 466         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 467                 return WERR_ACCESS_DENIED;
 468         }
 469
 470         if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
 471                 return err;
 472         }
 473
 474         vals = talloc_zero_array(mem_ctx, struct registry_value, num_names);
 475         if (vals == NULL) {
 476                 return WERR_NOMEM;
 477         }
 478
 479         for (n=0; n < num_names; n++) {
 480                 for (i=0; i < regval_ctr_numvals(key->values); i++) {
 481                         struct regval_blob *blob;
 482                         blob = regval_ctr_specific_value(key->values, i);
 483                         if (strequal(regval_name(blob), names[n])) {
 484                                 struct registry_value *v;
 485                                 err = reg_enumvalue(mem_ctx, key, i, NULL, &v);
 486                                 if (!W_ERROR_IS_OK(err)) {
 487                                         return err;
 488                                 }
 489                                 vals[n] = *v;
 490                                 found++;
 491                         }
 492                 }
 493         }
 494
 495         *pvals = vals;
 496         *pnum_vals = found;
 497
 498         return WERR_OK;
 499 }
 500
 501 WERROR reg_queryinfokey(struct registry_key *key, uint32_t *num_subkeys,
 502                         uint32_t *max_subkeylen, uint32_t *max_subkeysize,
 503                         uint32_t *num_values, uint32_t *max_valnamelen,
 504                         uint32_t *max_valbufsize, uint32_t *secdescsize,
 505                         NTTIME *last_changed_time)
 506 {
 507         uint32 i, max_size;
 508         size_t max_len;
 509         TALLOC_CTX *mem_ctx;
 510         WERROR err;
 511         struct security_descriptor *secdesc;
 512
 513         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 514                 return WERR_ACCESS_DENIED;
 515         }
 516
 517         if (!W_ERROR_IS_OK(fill_subkey_cache(key)) ||
 518             !W_ERROR_IS_OK(fill_value_cache(key))) {
 519                 return WERR_BADFILE;
 520         }
 521
 522         max_len = 0;
 523         for (i=0; i< regsubkey_ctr_numkeys(key->subkeys); i++) {
 524                 max_len = MAX(max_len,
 525                         strlen(regsubkey_ctr_specific_key(key->subkeys, i)));
 526         }
 527
 528         *num_subkeys = regsubkey_ctr_numkeys(key->subkeys);
 529         *max_subkeylen = max_len;
 530         *max_subkeysize = 0;    /* Class length? */
 531
 532         max_len = 0;
 533         max_size = 0;
 534         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 535                 struct regval_blob *blob;
 536                 blob = regval_ctr_specific_value(key->values, i);
 537                 max_len = MAX(max_len, strlen(regval_name(blob)));
 538                 max_size = MAX(max_size, regval_size(blob));
 539         }
 540
 541         *num_values = regval_ctr_numvals(key->values);
 542         *max_valnamelen = max_len;
 543         *max_valbufsize = max_size;
 544
 545         if (!(mem_ctx = talloc_new(key))) {
 546                 return WERR_NOMEM;
 547         }
 548
 549         err = regkey_get_secdesc(mem_ctx, key->key, &secdesc);
 550         if (!W_ERROR_IS_OK(err)) {
 551                 TALLOC_FREE(mem_ctx);
 552                 return err;
 553         }
 554
 555         *secdescsize = ndr_size_security_descriptor(secdesc, 0);
 556         TALLOC_FREE(mem_ctx);
 557
 558         *last_changed_time = 0;
 559
 560         return WERR_OK;
 561 }
 562
 563 WERROR reg_createkey(TALLOC_CTX *ctx, struct registry_key *parent,
 564                      const char *subkeypath, uint32 desired_access,
 565                      struct registry_key **pkey,
 566                      enum winreg_CreateAction *paction)
 567 {
 568         struct registry_key *key = parent;
 569         struct registry_key *create_parent;
 570         TALLOC_CTX *mem_ctx;
 571         char *path, *end;
 572         WERROR err;
 573
 574         mem_ctx = talloc_new(ctx);
 575         if (mem_ctx == NULL) {
 576                 return WERR_NOMEM;
 577         }
 578
 579         path = talloc_strdup(mem_ctx, subkeypath);
 580         if (path == NULL) {
 581                 err = WERR_NOMEM;
 582                 goto done;
 583         }
 584
 585         err = regdb_transaction_start();
 586         if (!W_ERROR_IS_OK(err)) {
 587                 DEBUG(0, ("reg_createkey: failed to start transaction: %s\n",
 588                           win_errstr(err)));
 589                 goto done;
 590         }
 591
 592         while ((end = strchr(path, '\\')) != NULL) {
 593                 struct registry_key *tmp;
 594                 enum winreg_CreateAction action;
 595
 596                 *end = '\0';
 597
 598                 err = reg_createkey(mem_ctx, key, path,
 599                                     KEY_ENUMERATE_SUB_KEYS, &tmp, &action);
 600                 if (!W_ERROR_IS_OK(err)) {
 601                         goto trans_done;
 602                 }
 603
 604                 if (key != parent) {
 605                         TALLOC_FREE(key);
 606                 }
 607
 608                 key = tmp;
 609                 path = end+1;
 610         }
 611
 612         /*
 613          * At this point, "path" contains the one-element subkey of "key". We
 614          * can try to open it.
 615          */
 616
 617         err = reg_openkey(ctx, key, path, desired_access, pkey);
 618         if (W_ERROR_IS_OK(err)) {
 619                 if (paction != NULL) {
 620                         *paction = REG_OPENED_EXISTING_KEY;
 621                 }
 622                 goto trans_done;
 623         }
 624
 625         if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
 626                 /*
 627                  * Something but "notfound" has happened, so bail out
 628                  */
 629                 goto trans_done;
 630         }
 631
 632         /*
 633          * We have to make a copy of the current key, as we opened it only
 634          * with ENUM_SUBKEY access.
 635          */
 636
 637         err = reg_openkey(mem_ctx, key, "", KEY_CREATE_SUB_KEY,
 638                           &create_parent);
 639         if (!W_ERROR_IS_OK(err)) {
 640                 goto trans_done;
 641         }
 642
 643         /*
 644          * Actually create the subkey
 645          */
 646
 647         err = fill_subkey_cache(create_parent);
 648         if (!W_ERROR_IS_OK(err)) {
 649                 goto trans_done;
 650         }
 651
 652         err = create_reg_subkey(key->key, path);
 653         if (!W_ERROR_IS_OK(err)) {
 654                 goto trans_done;
 655         }
 656
 657         /*
 658          * Now open the newly created key
 659          */
 660
 661         err = reg_openkey(ctx, create_parent, path, desired_access, pkey);
 662         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 663                 *paction = REG_CREATED_NEW_KEY;
 664         }
 665
 666 trans_done:
 667         if (W_ERROR_IS_OK(err)) {
 668                 err = regdb_transaction_commit();
 669                 if (!W_ERROR_IS_OK(err)) {
 670                         DEBUG(0, ("reg_createkey: Error committing transaction: %s\n", win_errstr(err)));
 671                 }
 672         } else {
 673                 WERROR err1 = regdb_transaction_cancel();
 674                 if (!W_ERROR_IS_OK(err1)) {
 675                         DEBUG(0, ("reg_createkey: Error cancelling transaction: %s\n", win_errstr(err1)));
 676                 }
 677         }
 678
 679  done:
 680         TALLOC_FREE(mem_ctx);
 681         return err;
 682 }
 683
 684 static WERROR reg_deletekey_internal(TALLOC_CTX *mem_ctx,
 685                                      struct registry_key *parent,
 686                                      const char *path, bool lazy)
 687 {
 688         WERROR err;
 689         char *name, *end;
 690         struct registry_key *key;
 691         name = talloc_strdup(mem_ctx, path);
 692         if (name == NULL) {
 693                 err = WERR_NOMEM;
 694                 goto done;
 695         }
 696
 697         /* no subkeys - proceed with delete */
 698         end = strrchr(name, '\\');
 699         if (end != NULL) {
 700                 *end = '\0';
 701
 702                 err = reg_openkey(mem_ctx, parent, name,
 703                                   KEY_CREATE_SUB_KEY, &key);
 704                 W_ERROR_NOT_OK_GOTO_DONE(err);
 705
 706                 parent = key;
 707                 name = end+1;
 708         }
 709
 710         if (name[0] == '\0') {
 711                 err = WERR_INVALID_PARAM;
 712                 goto done;
 713         }
 714
 715         err = delete_reg_subkey(parent->key, name, lazy);
 716
 717 done:
 718         return err;
 719 }
 720
 721 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 722 {
 723         WERROR err;
 724         struct registry_key *key;
 725         TALLOC_CTX *mem_ctx = talloc_stackframe();
 726
 727         /* check if the key has subkeys */
 728         err = reg_openkey(mem_ctx, parent, path, REG_KEY_READ, &key);
 729         W_ERROR_NOT_OK_GOTO_DONE(err);
 730
 731         err = regdb_transaction_start();
 732         if (!W_ERROR_IS_OK(err)) {
 733                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 734                           win_errstr(err)));
 735                 goto done;
 736         }
 737
 738         err = fill_subkey_cache(key);
 739         if (!W_ERROR_IS_OK(err)) {
 740                 goto trans_done;
 741         }
 742
 743         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 744                 err = WERR_ACCESS_DENIED;
 745                 goto trans_done;
 746         }
 747         err = reg_deletekey_internal(mem_ctx, parent, path, false);
 748
 749 trans_done:
 750         if (W_ERROR_IS_OK(err)) {
 751                 err = regdb_transaction_commit();
 752                 if (!W_ERROR_IS_OK(err)) {
 753                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 754                 }
 755         } else {
 756                 WERROR err1 = regdb_transaction_cancel();
 757                 if (!W_ERROR_IS_OK(err1)) {
 758                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 759                 }
 760         }
 761
 762 done:
 763         TALLOC_FREE(mem_ctx);
 764         return err;
 765 }
 766
 767
 768 WERROR reg_setvalue(struct registry_key *key, const char *name,
 769                     const struct registry_value *val)
 770 {
 771         struct regval_blob *existing;
 772         WERROR err;
 773         int res;
 774
 775         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 776                 return WERR_ACCESS_DENIED;
 777         }
 778
 779         err = regdb_transaction_start();
 780         if (!W_ERROR_IS_OK(err)) {
 781                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 782                           win_errstr(err)));
 783                 return err;
 784         }
 785
 786         err = fill_value_cache(key);
 787         if (!W_ERROR_IS_OK(err)) {
 788                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 789                 goto done;
 790         }
 791
 792         existing = regval_ctr_getvalue(key->values, name);
 793
 794         if ((existing != NULL) &&
 795             (regval_size(existing) == val->data.length) &&
 796             (memcmp(regval_data_p(existing), val->data.data,
 797                     val->data.length) == 0))
 798         {
 799                 err = WERR_OK;
 800                 goto done;
 801         }
 802
 803         res = regval_ctr_addvalue(key->values, name, val->type,
 804                                   val->data.data, val->data.length);
 805
 806         if (res == 0) {
 807                 TALLOC_FREE(key->values);
 808                 err = WERR_NOMEM;
 809                 goto done;
 810         }
 811
 812         if (!store_reg_values(key->key, key->values)) {
 813                 TALLOC_FREE(key->values);
 814                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 815                 err = WERR_REG_IO_FAILURE;
 816                 goto done;
 817         }
 818
 819         err = WERR_OK;
 820
 821 done:
 822         if (W_ERROR_IS_OK(err)) {
 823                 err = regdb_transaction_commit();
 824                 if (!W_ERROR_IS_OK(err)) {
 825                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 826                 }
 827         } else {
 828                 WERROR err1 = regdb_transaction_cancel();
 829                 if (!W_ERROR_IS_OK(err1)) {
 830                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 831                 }
 832         }
 833
 834         return err;
 835 }
 836
 837 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 838 {
 839         struct regval_blob *blob;
 840
 841         blob = regval_ctr_getvalue(key->values, name);
 842
 843         if (blob == NULL) {
 844                 return WERR_BADFILE;
 845         } else {
 846                 return WERR_OK;
 847         }
 848 }
 849
 850 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 851 {
 852         WERROR err;
 853
 854         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 855                 return WERR_ACCESS_DENIED;
 856         }
 857
 858         err = regdb_transaction_start();
 859         if (!W_ERROR_IS_OK(err)) {
 860                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 861                           win_errstr(err)));
 862                 return err;
 863         }
 864
 865         err = fill_value_cache(key);
 866         if (!W_ERROR_IS_OK(err)) {
 867                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 868                           win_errstr(err)));
 869                 goto done;
 870         }
 871
 872         err = reg_value_exists(key, name);
 873         if (!W_ERROR_IS_OK(err)) {
 874                 goto done;
 875         }
 876
 877         regval_ctr_delvalue(key->values, name);
 878
 879         if (!store_reg_values(key->key, key->values)) {
 880                 TALLOC_FREE(key->values);
 881                 err = WERR_REG_IO_FAILURE;
 882                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 883                 goto done;
 884         }
 885
 886         err = WERR_OK;
 887
 888 done:
 889         if (W_ERROR_IS_OK(err)) {
 890                 err = regdb_transaction_commit();
 891                 if (!W_ERROR_IS_OK(err)) {
 892                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 893                 }
 894         } else {
 895                 WERROR err1 = regdb_transaction_cancel();
 896                 if (!W_ERROR_IS_OK(err1)) {
 897                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 898                 }
 899         }
 900
 901         return err;
 902 }
 903
 904 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 905                           struct security_descriptor **psecdesc)
 906 {
 907         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 908 }
 909
 910 WERROR reg_setkeysecurity(struct registry_key *key,
 911                           struct security_descriptor *psecdesc)
 912 {
 913         return regkey_set_secdesc(key->key, psecdesc);
 914 }
 915
 916 WERROR reg_getversion(uint32_t *version)
 917 {
 918         if (version == NULL) {
 919                 return WERR_INVALID_PARAM;
 920         }
 921
 922         *version = 0x00000005; /* Windows 2000 registry API version */
 923         return WERR_OK;
 924 }
 925
 926 /**********************************************************************
 927  * Higher level utility functions
 928  **********************************************************************/
 929
 930 WERROR reg_deleteallvalues(struct registry_key *key)
 931 {
 932         WERROR err;
 933         int i;
 934
 935         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 936                 return WERR_ACCESS_DENIED;
 937         }
 938
 939         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 940                 return err;
 941         }
 942
 943         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 944                 struct regval_blob *blob;
 945                 blob = regval_ctr_specific_value(key->values, i);
 946                 regval_ctr_delvalue(key->values, regval_name(blob));
 947         }
 948
 949         if (!store_reg_values(key->key, key->values)) {
 950                 TALLOC_FREE(key->values);
 951                 return WERR_REG_IO_FAILURE;
 952         }
 953
 954         return WERR_OK;
 955 }
 956
 957 /*
 958  * Utility function to delete a registry key with all its subkeys.
 959  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 960  * key that has subkeys.
 961  */
 962 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 963                                                const char *path,
 964                                                bool del_key, bool lazy)
 965 {
 966         WERROR werr = WERR_OK;
 967         struct registry_key *key;
 968         char *subkey_name = NULL;
 969         uint32 i;
 970         TALLOC_CTX *mem_ctx = talloc_stackframe();
 971
 972         DEBUG(5, ("reg_deletekey_recursive_internal: deleting '%s' from '%s'\n",
 973                   path, parent->key->name));
 974
 975         /* recurse through subkeys first */
 976         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 977         if (!W_ERROR_IS_OK(werr)) {
 978                 DEBUG(3, ("reg_deletekey_recursive_internal: error opening "
 979                           "subkey '%s' of '%s': '%s'\n",
 980                           path, parent->key->name, win_errstr(werr)));
 981                 goto done;
 982         }
 983
 984         werr = fill_subkey_cache(key);
 985         W_ERROR_NOT_OK_GOTO_DONE(werr);
 986
 987         /*
 988          * loop from top to bottom for perfomance:
 989          * this way, we need to rehash the regsubkey containers less
 990          */
 991         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 992                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 993                 werr = reg_deletekey_recursive_internal(key, subkey_name, true, del_key);
 994                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 995         }
 996
 997         if (del_key) {
 998                 /* now delete the actual key */
 999                 werr = reg_deletekey_internal(mem_ctx, parent, path, lazy);
1000         }
1001
1002 done:
1003
1004         DEBUG(5, ("reg_deletekey_recursive_internal: done deleting '%s' from "
1005                   "'%s': %s\n",
1006                   path, parent->key->name, win_errstr(werr)));
1007         TALLOC_FREE(mem_ctx);
1008         return werr;
1009 }
1010
1011 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
1012                                             const char *path,
1013                                             bool del_key)
1014 {
1015         WERROR werr;
1016
1017         werr = regdb_transaction_start();
1018         if (!W_ERROR_IS_OK(werr)) {
1019                 DEBUG(0, ("reg_deletekey_recursive_trans: "
1020                           "error starting transaction: %s\n",
1021                           win_errstr(werr)));
1022                 return werr;
1023         }
1024
1025         werr = reg_deletekey_recursive_internal(parent, path, del_key, false);
1026
1027         if (!W_ERROR_IS_OK(werr)) {
1028                 WERROR werr2;
1029
1030                 DEBUG(1, (__location__ " failed to delete key '%s' from key "
1031                           "'%s': %s\n", path, parent->key->name,
1032                           win_errstr(werr)));
1033
1034                 werr2 = regdb_transaction_cancel();
1035                 if (!W_ERROR_IS_OK(werr2)) {
1036                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1037                                   "error cancelling transaction: %s\n",
1038                                   win_errstr(werr2)));
1039                         /*
1040                          * return the original werr or the
1041                          * error from cancelling the transaction?
1042                          */
1043                 }
1044         } else {
1045                 werr = regdb_transaction_commit();
1046                 if (!W_ERROR_IS_OK(werr)) {
1047                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1048                                   "error committing transaction: %s\n",
1049                                   win_errstr(werr)));
1050                 } else {
1051                         DEBUG(5, ("reg_reletekey_recursive_trans: deleted key '%s' from '%s'\n",
1052                                   path, parent->key->name));
1053
1054                 }
1055         }
1056
1057         return werr;
1058 }
1059
1060 WERROR reg_deletekey_recursive(struct registry_key *parent,
1061                                const char *path)
1062 {
1063         return reg_deletekey_recursive_trans(parent, path, true);
1064 }
1065
1066 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1067                                    const char *path)
1068 {
1069         return reg_deletekey_recursive_trans(parent, path, false);
1070 }
1071