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 #include "reg_parse_internal.h"
  74 #include "libcli/security/security_token.h"
  75
  76 #undef DBGC_CLASS
  77 #define DBGC_CLASS DBGC_REGISTRY
  78
  79
  80 /**********************************************************************
  81  * Helper functions
  82  **********************************************************************/
  83
  84 static WERROR fill_value_cache(struct registry_key *key)
  85 {
  86         WERROR werr;
  87
  88         if (key->values != NULL) {
  89                 if (!reg_values_need_update(key->key, key->values)) {
  90                         return WERR_OK;
  91                 }
  92         }
  93
  94         TALLOC_FREE(key->values);
  95         werr = regval_ctr_init(key, &(key->values));
  96         W_ERROR_NOT_OK_RETURN(werr);
  97
  98         if (fetch_reg_values(key->key, key->values) == -1) {
  99                 TALLOC_FREE(key->values);
 100                 return WERR_FILE_NOT_FOUND;
 101         }
 102
 103         return WERR_OK;
 104 }
 105
 106 static WERROR fill_subkey_cache(struct registry_key *key)
 107 {
 108         WERROR werr;
 109
 110         if (key->subkeys != NULL) {
 111                 if (!reg_subkeys_need_update(key->key, key->subkeys)) {
 112                         return WERR_OK;
 113                 }
 114         }
 115
 116         TALLOC_FREE(key->subkeys);
 117         werr = regsubkey_ctr_init(key, &(key->subkeys));
 118         W_ERROR_NOT_OK_RETURN(werr);
 119
 120         if (fetch_reg_keys(key->key, key->subkeys) == -1) {
 121                 TALLOC_FREE(key->subkeys);
 122                 return WERR_FILE_NOT_FOUND;
 123         }
 124
 125         return WERR_OK;
 126 }
 127
 128 static int regkey_destructor(struct registry_key_handle *key)
 129 {
 130         return regdb_close();
 131 }
 132
 133 static WERROR regkey_open_onelevel(TALLOC_CTX *mem_ctx,
 134                                    struct registry_key *parent,
 135                                    const char *name,
 136                                    const struct security_token *token,
 137                                    uint32_t access_desired,
 138                                    struct registry_key **pregkey)
 139 {
 140         WERROR result;
 141         struct registry_key *regkey;
 142         struct registry_key_handle *key;
 143
 144         DEBUG(7,("regkey_open_onelevel: name = [%s]\n", name));
 145
 146         SMB_ASSERT(strchr(name, '\\') == NULL);
 147
 148         if (!(regkey = talloc_zero(mem_ctx, struct registry_key)) ||
 149             !(regkey->token = security_token_duplicate(regkey, token)) ||
 150             !(regkey->key = talloc_zero(regkey, struct registry_key_handle)))
 151         {
 152                 result = WERR_NOT_ENOUGH_MEMORY;
 153                 goto done;
 154         }
 155
 156         result = regdb_open();
 157         if (!(W_ERROR_IS_OK(result))) {
 158                 goto done;
 159         }
 160
 161         key = regkey->key;
 162         talloc_set_destructor(key, regkey_destructor);
 163
 164         /* initialization */
 165
 166         key->type = REG_KEY_GENERIC;
 167
 168         if (name[0] == '\0') {
 169                 /*
 170                  * Open a copy of the parent key
 171                  */
 172                 if (!parent) {
 173                         result = WERR_FILE_NOT_FOUND;
 174                         goto done;
 175                 }
 176                 key->name = talloc_strdup(key, parent->key->name);
 177         }
 178         else {
 179                 /*
 180                  * Normal subkey open
 181                  */
 182                 key->name = talloc_asprintf(key, "%s%s%s",
 183                                             parent ? parent->key->name : "",
 184                                             parent ? "\\": "",
 185                                             name);
 186         }
 187
 188         if (key->name == NULL) {
 189                 result = WERR_NOT_ENOUGH_MEMORY;
 190                 goto done;
 191         }
 192
 193         /* Tag this as a Performance Counter Key */
 194
 195         if( strncasecmp_m(key->name, KEY_HKPD, strlen(KEY_HKPD)) == 0 )
 196                 key->type = REG_KEY_HKPD;
 197
 198         /* Look up the table of registry I/O operations */
 199
 200         key->ops = reghook_cache_find( key->name );
 201         if (key->ops == NULL) {
 202                 DEBUG(0,("reg_open_onelevel: Failed to assign "
 203                          "registry_ops to [%s]\n", key->name ));
 204                 result = WERR_FILE_NOT_FOUND;
 205                 goto done;
 206         }
 207
 208         /* FIXME: Existence is currently checked by fetching the subkeys */
 209
 210         result = fill_subkey_cache(regkey);
 211         if (!W_ERROR_IS_OK(result)) {
 212                 goto done;
 213         }
 214
 215         if ( !regkey_access_check( key, access_desired, &key->access_granted,
 216                                    token ) ) {
 217                 result = WERR_ACCESS_DENIED;
 218                 goto done;
 219         }
 220
 221         *pregkey = regkey;
 222         result = WERR_OK;
 223
 224 done:
 225         if ( !W_ERROR_IS_OK(result) ) {
 226                 TALLOC_FREE(regkey);
 227         }
 228
 229         return result;
 230 }
 231
 232 WERROR reg_openhive(TALLOC_CTX *mem_ctx, const char *hive,
 233                     uint32_t desired_access,
 234                     const struct security_token *token,
 235                     struct registry_key **pkey)
 236 {
 237         const struct hive_info *hi;
 238         SMB_ASSERT(hive != NULL);
 239         SMB_ASSERT(strchr(hive, '\\') == NULL);
 240
 241         hi = hive_info(hive);
 242         if (hi == NULL) {
 243                 return WERR_FILE_NOT_FOUND;
 244         }
 245
 246         return regkey_open_onelevel(mem_ctx, NULL, hi->short_name, token,
 247                                     desired_access, pkey);
 248 }
 249
 250
 251 /**********************************************************************
 252  * The API functions
 253  **********************************************************************/
 254
 255 WERROR reg_openkey(TALLOC_CTX *mem_ctx, struct registry_key *parent,
 256                    const char *name, uint32_t desired_access,
 257                    struct registry_key **pkey)
 258 {
 259         struct registry_key *direct_parent = parent;
 260         WERROR err;
 261         char *p, *path;
 262         size_t len;
 263         TALLOC_CTX *frame = talloc_stackframe();
 264
 265         path = talloc_strdup(frame, name);
 266         if (path == NULL) {
 267                 err = WERR_NOT_ENOUGH_MEMORY;
 268                 goto error;
 269         }
 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                 name_component = talloc_strndup(frame, path, (p - path));
 282                 if (name_component == NULL) {
 283                         err = WERR_NOT_ENOUGH_MEMORY;
 284                         goto error;
 285                 }
 286
 287                 err = regkey_open_onelevel(frame, direct_parent,
 288                                            name_component, parent->token,
 289                                            KEY_ENUMERATE_SUB_KEYS, &tmp);
 290
 291                 if (!W_ERROR_IS_OK(err)) {
 292                         goto error;
 293                 }
 294
 295                 direct_parent = tmp;
 296                 path = p+1;
 297         }
 298
 299         err = regkey_open_onelevel(mem_ctx, direct_parent, path, parent->token,
 300                                    desired_access, pkey);
 301
 302 error:
 303         talloc_free(frame);
 304         return err;
 305 }
 306
 307 WERROR reg_enumkey(TALLOC_CTX *mem_ctx, struct registry_key *key,
 308                    uint32_t idx, char **name, NTTIME *last_write_time)
 309 {
 310         WERROR err;
 311
 312         if (!(key->key->access_granted & KEY_ENUMERATE_SUB_KEYS)) {
 313                 return WERR_ACCESS_DENIED;
 314         }
 315
 316         err = fill_subkey_cache(key);
 317         if (!W_ERROR_IS_OK(err)) {
 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_NOT_ENOUGH_MEMORY;
 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_t 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         err = fill_value_cache(key);
 350         if (!(W_ERROR_IS_OK(err))) {
 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_NOT_ENOUGH_MEMORY;
 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_NOT_ENOUGH_MEMORY;
 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_t 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_NOT_ENOUGH_MEMORY;
 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_NOT_ENOUGH_MEMORY;
 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_t 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_FILE_NOT_FOUND;
 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_NOT_ENOUGH_MEMORY;
 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_t 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_FILE_NOT_FOUND;
 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_NOT_ENOUGH_MEMORY;
 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_t desired_access,
 562                      struct registry_key **pkey,
 563                      enum winreg_CreateAction *paction)
 564 {
 565         struct registry_key *key = parent;
 566         TALLOC_CTX *mem_ctx;
 567         char *path, *end;
 568         WERROR err;
 569         uint32_t access_granted;
 570
 571         mem_ctx = talloc_new(ctx);
 572         if (mem_ctx == NULL) {
 573                 return WERR_NOT_ENOUGH_MEMORY;
 574         }
 575
 576         path = talloc_strdup(mem_ctx, subkeypath);
 577         if (path == NULL) {
 578                 err = WERR_NOT_ENOUGH_MEMORY;
 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_FILE_NOT_FOUND)) {
 623                 /*
 624                  * Something but "notfound" has happened, so bail out
 625                  */
 626                 goto trans_done;
 627         }
 628
 629         /*
 630          * We may (e.g. in the iteration) have opened the key with ENUM_SUBKEY.
 631          * Instead of re-opening the key with CREATE_SUB_KEY, we simply
 632          * duplicate the access check here and skip the expensive full open.
 633          */
 634         if (!regkey_access_check(key->key, KEY_CREATE_SUB_KEY, &access_granted,
 635                                  key->token))
 636         {
 637                 err = WERR_ACCESS_DENIED;
 638                 goto trans_done;
 639         }
 640
 641         /*
 642          * Actually create the subkey
 643          */
 644
 645         err = create_reg_subkey(key->key, path);
 646         if (!W_ERROR_IS_OK(err)) {
 647                 goto trans_done;
 648         }
 649
 650         /*
 651          * Now open the newly created key
 652          */
 653
 654         err = reg_openkey(ctx, key, path, desired_access, pkey);
 655         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 656                 *paction = REG_CREATED_NEW_KEY;
 657         }
 658
 659 trans_done:
 660         if (W_ERROR_IS_OK(err)) {
 661                 err = regdb_transaction_commit();
 662                 if (!W_ERROR_IS_OK(err)) {
 663                         DEBUG(0, ("reg_createkey: Error committing transaction: %s\n", win_errstr(err)));
 664                 }
 665         } else {
 666                 WERROR err1 = regdb_transaction_cancel();
 667                 if (!W_ERROR_IS_OK(err1)) {
 668                         DEBUG(0, ("reg_createkey: Error cancelling transaction: %s\n", win_errstr(err1)));
 669                 }
 670         }
 671
 672  done:
 673         TALLOC_FREE(mem_ctx);
 674         return err;
 675 }
 676
 677 static WERROR reg_deletekey_internal(TALLOC_CTX *mem_ctx,
 678                                      struct registry_key *parent,
 679                                      const char *path, bool lazy)
 680 {
 681         WERROR err;
 682         char *name, *end;
 683         struct registry_key *key;
 684         name = talloc_strdup(mem_ctx, path);
 685         if (name == NULL) {
 686                 err = WERR_NOT_ENOUGH_MEMORY;
 687                 goto done;
 688         }
 689
 690         /* no subkeys - proceed with delete */
 691         end = strrchr(name, '\\');
 692         if (end != NULL) {
 693                 *end = '\0';
 694
 695                 err = reg_openkey(mem_ctx, parent, name,
 696                                   KEY_CREATE_SUB_KEY, &key);
 697                 W_ERROR_NOT_OK_GOTO_DONE(err);
 698
 699                 parent = key;
 700                 name = end+1;
 701         }
 702
 703         if (name[0] == '\0') {
 704                 err = WERR_INVALID_PARAMETER;
 705                 goto done;
 706         }
 707
 708         err = delete_reg_subkey(parent->key, name, lazy);
 709
 710 done:
 711         return err;
 712 }
 713
 714 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 715 {
 716         WERROR err;
 717         struct registry_key *key;
 718         TALLOC_CTX *mem_ctx = talloc_stackframe();
 719
 720         /* check if the key has subkeys */
 721         err = reg_openkey(mem_ctx, parent, path, REG_KEY_READ, &key);
 722         W_ERROR_NOT_OK_GOTO_DONE(err);
 723
 724         err = regdb_transaction_start();
 725         if (!W_ERROR_IS_OK(err)) {
 726                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 727                           win_errstr(err)));
 728                 goto done;
 729         }
 730
 731         err = fill_subkey_cache(key);
 732         if (!W_ERROR_IS_OK(err)) {
 733                 goto trans_done;
 734         }
 735
 736         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 737                 err = WERR_ACCESS_DENIED;
 738                 goto trans_done;
 739         }
 740         err = reg_deletekey_internal(mem_ctx, parent, path, false);
 741
 742 trans_done:
 743         if (W_ERROR_IS_OK(err)) {
 744                 err = regdb_transaction_commit();
 745                 if (!W_ERROR_IS_OK(err)) {
 746                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 747                 }
 748         } else {
 749                 WERROR err1 = regdb_transaction_cancel();
 750                 if (!W_ERROR_IS_OK(err1)) {
 751                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 752                 }
 753         }
 754
 755 done:
 756         TALLOC_FREE(mem_ctx);
 757         return err;
 758 }
 759
 760
 761 WERROR reg_setvalue(struct registry_key *key, const char *name,
 762                     const struct registry_value *val)
 763 {
 764         struct regval_blob *existing;
 765         WERROR err;
 766         int res;
 767
 768         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 769                 return WERR_ACCESS_DENIED;
 770         }
 771
 772         err = regdb_transaction_start();
 773         if (!W_ERROR_IS_OK(err)) {
 774                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 775                           win_errstr(err)));
 776                 return err;
 777         }
 778
 779         err = fill_value_cache(key);
 780         if (!W_ERROR_IS_OK(err)) {
 781                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 782                 goto done;
 783         }
 784
 785         existing = regval_ctr_getvalue(key->values, name);
 786
 787         if ((existing != NULL) &&
 788             (regval_size(existing) == val->data.length) &&
 789             (memcmp(regval_data_p(existing), val->data.data,
 790                     val->data.length) == 0))
 791         {
 792                 err = WERR_OK;
 793                 goto done;
 794         }
 795
 796         res = regval_ctr_addvalue(key->values, name, val->type,
 797                                   val->data.data, val->data.length);
 798
 799         if (res == 0) {
 800                 TALLOC_FREE(key->values);
 801                 err = WERR_NOT_ENOUGH_MEMORY;
 802                 goto done;
 803         }
 804
 805         if (!store_reg_values(key->key, key->values)) {
 806                 TALLOC_FREE(key->values);
 807                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 808                 err = WERR_REGISTRY_IO_FAILED;
 809                 goto done;
 810         }
 811
 812         err = WERR_OK;
 813
 814 done:
 815         if (W_ERROR_IS_OK(err)) {
 816                 err = regdb_transaction_commit();
 817                 if (!W_ERROR_IS_OK(err)) {
 818                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 819                 }
 820         } else {
 821                 WERROR err1 = regdb_transaction_cancel();
 822                 if (!W_ERROR_IS_OK(err1)) {
 823                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 824                 }
 825         }
 826
 827         return err;
 828 }
 829
 830 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 831 {
 832         struct regval_blob *blob;
 833
 834         blob = regval_ctr_getvalue(key->values, name);
 835
 836         if (blob == NULL) {
 837                 return WERR_FILE_NOT_FOUND;
 838         } else {
 839                 return WERR_OK;
 840         }
 841 }
 842
 843 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 844 {
 845         WERROR err;
 846
 847         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 848                 return WERR_ACCESS_DENIED;
 849         }
 850
 851         err = regdb_transaction_start();
 852         if (!W_ERROR_IS_OK(err)) {
 853                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 854                           win_errstr(err)));
 855                 return err;
 856         }
 857
 858         err = fill_value_cache(key);
 859         if (!W_ERROR_IS_OK(err)) {
 860                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 861                           win_errstr(err)));
 862                 goto done;
 863         }
 864
 865         err = reg_value_exists(key, name);
 866         if (!W_ERROR_IS_OK(err)) {
 867                 goto done;
 868         }
 869
 870         regval_ctr_delvalue(key->values, name);
 871
 872         if (!store_reg_values(key->key, key->values)) {
 873                 TALLOC_FREE(key->values);
 874                 err = WERR_REGISTRY_IO_FAILED;
 875                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 876                 goto done;
 877         }
 878
 879         err = WERR_OK;
 880
 881 done:
 882         if (W_ERROR_IS_OK(err)) {
 883                 err = regdb_transaction_commit();
 884                 if (!W_ERROR_IS_OK(err)) {
 885                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 886                 }
 887         } else {
 888                 WERROR err1 = regdb_transaction_cancel();
 889                 if (!W_ERROR_IS_OK(err1)) {
 890                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 891                 }
 892         }
 893
 894         return err;
 895 }
 896
 897 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 898                           struct security_descriptor **psecdesc)
 899 {
 900         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 901 }
 902
 903 WERROR reg_setkeysecurity(struct registry_key *key,
 904                           struct security_descriptor *psecdesc)
 905 {
 906         return regkey_set_secdesc(key->key, psecdesc);
 907 }
 908
 909 WERROR reg_getversion(uint32_t *version)
 910 {
 911         if (version == NULL) {
 912                 return WERR_INVALID_PARAMETER;
 913         }
 914
 915         *version = 0x00000005; /* Windows 2000 registry API version */
 916         return WERR_OK;
 917 }
 918
 919 /**********************************************************************
 920  * Higher level utility functions
 921  **********************************************************************/
 922
 923 WERROR reg_deleteallvalues(struct registry_key *key)
 924 {
 925         WERROR err;
 926         uint32_t i;
 927
 928         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 929                 return WERR_ACCESS_DENIED;
 930         }
 931
 932         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 933                 return err;
 934         }
 935
 936         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 937                 struct regval_blob *blob;
 938                 blob = regval_ctr_specific_value(key->values, i);
 939                 regval_ctr_delvalue(key->values, regval_name(blob));
 940         }
 941
 942         if (!store_reg_values(key->key, key->values)) {
 943                 TALLOC_FREE(key->values);
 944                 return WERR_REGISTRY_IO_FAILED;
 945         }
 946
 947         return WERR_OK;
 948 }
 949
 950 /*
 951  * Utility function to delete a registry key with all its subkeys.
 952  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 953  * key that has subkeys.
 954  */
 955 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 956                                                const char *path,
 957                                                bool del_key, bool lazy)
 958 {
 959         WERROR werr;
 960         struct registry_key *key;
 961         char *subkey_name = NULL;
 962         uint32_t i;
 963         TALLOC_CTX *mem_ctx = talloc_stackframe();
 964
 965         DEBUG(5, ("reg_deletekey_recursive_internal: deleting '%s' from '%s'\n",
 966                   path, parent->key->name));
 967
 968         /* recurse through subkeys first */
 969         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 970         if (!W_ERROR_IS_OK(werr)) {
 971                 DEBUG(3, ("reg_deletekey_recursive_internal: error opening "
 972                           "subkey '%s' of '%s': '%s'\n",
 973                           path, parent->key->name, win_errstr(werr)));
 974                 goto done;
 975         }
 976
 977         werr = fill_subkey_cache(key);
 978         W_ERROR_NOT_OK_GOTO_DONE(werr);
 979
 980         /*
 981          * loop from top to bottom for performance:
 982          * this way, we need to rehash the regsubkey containers less
 983          */
 984         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 985                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 986                 werr = reg_deletekey_recursive_internal(key, subkey_name, true, del_key);
 987                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 988         }
 989
 990         if (del_key) {
 991                 /* now delete the actual key */
 992                 werr = reg_deletekey_internal(mem_ctx, parent, path, lazy);
 993         }
 994
 995 done:
 996
 997         DEBUG(5, ("reg_deletekey_recursive_internal: done deleting '%s' from "
 998                   "'%s': %s\n",
 999                   path, parent->key->name, win_errstr(werr)));
1000         TALLOC_FREE(mem_ctx);
1001         return werr;
1002 }
1003
1004 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
1005                                             const char *path,
1006                                             bool del_key)
1007 {
1008         WERROR werr;
1009
1010         werr = regdb_transaction_start();
1011         if (!W_ERROR_IS_OK(werr)) {
1012                 DEBUG(0, ("reg_deletekey_recursive_trans: "
1013                           "error starting transaction: %s\n",
1014                           win_errstr(werr)));
1015                 return werr;
1016         }
1017
1018         werr = reg_deletekey_recursive_internal(parent, path, del_key, false);
1019
1020         if (!W_ERROR_IS_OK(werr)) {
1021                 WERROR werr2;
1022                 DEBUG(W_ERROR_EQUAL(werr, WERR_FILE_NOT_FOUND) ? 5 : 1,
1023                       (__location__ ": failed to delete key '%s' from key "
1024                        "'%s': %s\n", path, parent->key->name,
1025                        win_errstr(werr)));
1026
1027                 werr2 = regdb_transaction_cancel();
1028                 if (!W_ERROR_IS_OK(werr2)) {
1029                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1030                                   "error cancelling transaction: %s\n",
1031                                   win_errstr(werr2)));
1032                         /*
1033                          * return the original werr or the
1034                          * error from cancelling the transaction?
1035                          */
1036                 }
1037         } else {
1038                 werr = regdb_transaction_commit();
1039                 if (!W_ERROR_IS_OK(werr)) {
1040                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1041                                   "error committing transaction: %s\n",
1042                                   win_errstr(werr)));
1043                 } else {
1044                         DEBUG(5, ("reg_deletekey_recursive_trans: deleted key '%s' from '%s'\n",
1045                                   path, parent->key->name));
1046
1047                 }
1048         }
1049
1050         return werr;
1051 }
1052
1053 WERROR reg_deletekey_recursive(struct registry_key *parent,
1054                                const char *path)
1055 {
1056         return reg_deletekey_recursive_trans(parent, path, true);
1057 }
1058
1059 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1060                                    const char *path)
1061 {
1062         return reg_deletekey_recursive_trans(parent, path, false);
1063 }
1064