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
  75 #undef DBGC_CLASS
  76 #define DBGC_CLASS DBGC_REGISTRY
  77
  78
  79 /**********************************************************************
  80  * Helper functions
  81  **********************************************************************/
  82
  83 static WERROR fill_value_cache(struct registry_key *key)
  84 {
  85         WERROR werr;
  86
  87         if (key->values != NULL) {
  88                 if (!reg_values_need_update(key->key, key->values)) {
  89                         return WERR_OK;
  90                 }
  91         }
  92
  93         TALLOC_FREE(key->values);
  94         werr = regval_ctr_init(key, &(key->values));
  95         W_ERROR_NOT_OK_RETURN(werr);
  96
  97         if (fetch_reg_values(key->key, key->values) == -1) {
  98                 TALLOC_FREE(key->values);
  99                 return WERR_BADFILE;
 100         }
 101
 102         return WERR_OK;
 103 }
 104
 105 static WERROR fill_subkey_cache(struct registry_key *key)
 106 {
 107         WERROR werr;
 108
 109         if (key->subkeys != NULL) {
 110                 if (!reg_subkeys_need_update(key->key, key->subkeys)) {
 111                         return WERR_OK;
 112                 }
 113         }
 114
 115         TALLOC_FREE(key->subkeys);
 116         werr = regsubkey_ctr_init(key, &(key->subkeys));
 117         W_ERROR_NOT_OK_RETURN(werr);
 118
 119         if (fetch_reg_keys(key->key, key->subkeys) == -1) {
 120                 TALLOC_FREE(key->subkeys);
 121                 return WERR_BADFILE;
 122         }
 123
 124         return WERR_OK;
 125 }
 126
 127 static int regkey_destructor(struct registry_key_handle *key)
 128 {
 129         return regdb_close();
 130 }
 131
 132 static WERROR regkey_open_onelevel(TALLOC_CTX *mem_ctx,
 133                                    struct registry_key *parent,
 134                                    const char *name,
 135                                    const struct security_token *token,
 136                                    uint32_t access_desired,
 137                                    struct registry_key **pregkey)
 138 {
 139         WERROR          result = WERR_OK;
 140         struct registry_key *regkey;
 141         struct registry_key_handle *key;
 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         /* FIXME: Existence is currently checked by fetching the subkeys */
 208
 209         result = fill_subkey_cache(regkey);
 210         if (!W_ERROR_IS_OK(result)) {
 211                 goto done;
 212         }
 213
 214         if ( !regkey_access_check( key, access_desired, &key->access_granted,
 215                                    token ) ) {
 216                 result = WERR_ACCESS_DENIED;
 217                 goto done;
 218         }
 219
 220         *pregkey = regkey;
 221         result = WERR_OK;
 222
 223 done:
 224         if ( !W_ERROR_IS_OK(result) ) {
 225                 TALLOC_FREE(regkey);
 226         }
 227
 228         return result;
 229 }
 230
 231 WERROR reg_openhive(TALLOC_CTX *mem_ctx, const char *hive,
 232                     uint32_t desired_access,
 233                     const struct security_token *token,
 234                     struct registry_key **pkey)
 235 {
 236         const struct hive_info *hi;
 237         SMB_ASSERT(hive != NULL);
 238         SMB_ASSERT(strchr(hive, '\\') == NULL);
 239
 240         hi = hive_info(hive);
 241         if (hi == NULL) {
 242                 return WERR_BADFILE;
 243         }
 244
 245         return regkey_open_onelevel(mem_ctx, NULL, hi->short_name, token,
 246                                     desired_access, pkey);
 247 }
 248
 249
 250 /**********************************************************************
 251  * The API functions
 252  **********************************************************************/
 253
 254 WERROR reg_openkey(TALLOC_CTX *mem_ctx, struct registry_key *parent,
 255                    const char *name, uint32_t desired_access,
 256                    struct registry_key **pkey)
 257 {
 258         struct registry_key *direct_parent = parent;
 259         WERROR err;
 260         char *p, *path;
 261         size_t len;
 262         TALLOC_CTX *frame = talloc_stackframe();
 263
 264         path = talloc_strdup(frame, name);
 265         if (path == NULL) {
 266                 err = WERR_NOMEM;
 267                 goto error;
 268         }
 269
 270         len = strlen(path);
 271
 272         if ((len > 0) && (path[len-1] == '\\')) {
 273                 path[len-1] = '\0';
 274         }
 275
 276         while ((p = strchr(path, '\\')) != NULL) {
 277                 char *name_component;
 278                 struct registry_key *tmp;
 279
 280                 name_component = talloc_strndup(frame, path, (p - path));
 281                 if (name_component == NULL) {
 282                         err = WERR_NOMEM;
 283                         goto error;
 284                 }
 285
 286                 err = regkey_open_onelevel(frame, direct_parent,
 287                                            name_component, parent->token,
 288                                            KEY_ENUMERATE_SUB_KEYS, &tmp);
 289
 290                 if (!W_ERROR_IS_OK(err)) {
 291                         goto error;
 292                 }
 293
 294                 direct_parent = tmp;
 295                 path = p+1;
 296         }
 297
 298         err = regkey_open_onelevel(mem_ctx, direct_parent, path, parent->token,
 299                                    desired_access, pkey);
 300
 301 error:
 302         talloc_free(frame);
 303         return err;
 304 }
 305
 306 WERROR reg_enumkey(TALLOC_CTX *mem_ctx, struct registry_key *key,
 307                    uint32_t idx, char **name, NTTIME *last_write_time)
 308 {
 309         WERROR err;
 310
 311         if (!(key->key->access_granted & KEY_ENUMERATE_SUB_KEYS)) {
 312                 return WERR_ACCESS_DENIED;
 313         }
 314
 315         err = fill_subkey_cache(key);
 316         if (!W_ERROR_IS_OK(err)) {
 317                 return err;
 318         }
 319
 320         if (idx >= regsubkey_ctr_numkeys(key->subkeys)) {
 321                 return WERR_NO_MORE_ITEMS;
 322         }
 323
 324         if (!(*name = talloc_strdup(mem_ctx,
 325                         regsubkey_ctr_specific_key(key->subkeys, idx))))
 326         {
 327                 return WERR_NOMEM;
 328         }
 329
 330         if (last_write_time) {
 331                 *last_write_time = 0;
 332         }
 333
 334         return WERR_OK;
 335 }
 336
 337 WERROR reg_enumvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
 338                      uint32_t idx, char **pname, struct registry_value **pval)
 339 {
 340         struct registry_value *val;
 341         struct regval_blob *blob;
 342         WERROR err;
 343
 344         if (!(key->key->access_granted & KEY_QUERY_VALUE)) {
 345                 return WERR_ACCESS_DENIED;
 346         }
 347
 348         err = fill_value_cache(key);
 349         if (!(W_ERROR_IS_OK(err))) {
 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_t 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_t 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_t 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_t desired_access,
 561                      struct registry_key **pkey,
 562                      enum winreg_CreateAction *paction)
 563 {
 564         struct registry_key *key = parent;
 565         TALLOC_CTX *mem_ctx;
 566         char *path, *end;
 567         WERROR err;
 568         uint32_t access_granted;
 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 may (e.g. in the iteration) have opened the key with ENUM_SUBKEY.
 630          * Instead of re-opening the key with CREATE_SUB_KEY, we simply
 631          * duplicate the access check here and skip the expensive full open.
 632          */
 633         if (!regkey_access_check(key->key, KEY_CREATE_SUB_KEY, &access_granted,
 634                                  key->token))
 635         {
 636                 err = WERR_ACCESS_DENIED;
 637                 goto trans_done;
 638         }
 639
 640         /*
 641          * Actually create the subkey
 642          */
 643
 644         err = create_reg_subkey(key->key, path);
 645         if (!W_ERROR_IS_OK(err)) {
 646                 goto trans_done;
 647         }
 648
 649         /*
 650          * Now open the newly created key
 651          */
 652
 653         err = reg_openkey(ctx, key, path, desired_access, pkey);
 654         if (W_ERROR_IS_OK(err) && (paction != NULL)) {
 655                 *paction = REG_CREATED_NEW_KEY;
 656         }
 657
 658 trans_done:
 659         if (W_ERROR_IS_OK(err)) {
 660                 err = regdb_transaction_commit();
 661                 if (!W_ERROR_IS_OK(err)) {
 662                         DEBUG(0, ("reg_createkey: Error committing transaction: %s\n", win_errstr(err)));
 663                 }
 664         } else {
 665                 WERROR err1 = regdb_transaction_cancel();
 666                 if (!W_ERROR_IS_OK(err1)) {
 667                         DEBUG(0, ("reg_createkey: Error cancelling transaction: %s\n", win_errstr(err1)));
 668                 }
 669         }
 670
 671  done:
 672         TALLOC_FREE(mem_ctx);
 673         return err;
 674 }
 675
 676 static WERROR reg_deletekey_internal(TALLOC_CTX *mem_ctx,
 677                                      struct registry_key *parent,
 678                                      const char *path, bool lazy)
 679 {
 680         WERROR err;
 681         char *name, *end;
 682         struct registry_key *key;
 683         name = talloc_strdup(mem_ctx, path);
 684         if (name == NULL) {
 685                 err = WERR_NOMEM;
 686                 goto done;
 687         }
 688
 689         /* no subkeys - proceed with delete */
 690         end = strrchr(name, '\\');
 691         if (end != NULL) {
 692                 *end = '\0';
 693
 694                 err = reg_openkey(mem_ctx, parent, name,
 695                                   KEY_CREATE_SUB_KEY, &key);
 696                 W_ERROR_NOT_OK_GOTO_DONE(err);
 697
 698                 parent = key;
 699                 name = end+1;
 700         }
 701
 702         if (name[0] == '\0') {
 703                 err = WERR_INVALID_PARAM;
 704                 goto done;
 705         }
 706
 707         err = delete_reg_subkey(parent->key, name, lazy);
 708
 709 done:
 710         return err;
 711 }
 712
 713 WERROR reg_deletekey(struct registry_key *parent, const char *path)
 714 {
 715         WERROR err;
 716         struct registry_key *key;
 717         TALLOC_CTX *mem_ctx = talloc_stackframe();
 718
 719         /* check if the key has subkeys */
 720         err = reg_openkey(mem_ctx, parent, path, REG_KEY_READ, &key);
 721         W_ERROR_NOT_OK_GOTO_DONE(err);
 722
 723         err = regdb_transaction_start();
 724         if (!W_ERROR_IS_OK(err)) {
 725                 DEBUG(0, ("reg_deletekey: Error starting transaction: %s\n",
 726                           win_errstr(err)));
 727                 goto done;
 728         }
 729
 730         err = fill_subkey_cache(key);
 731         if (!W_ERROR_IS_OK(err)) {
 732                 goto trans_done;
 733         }
 734
 735         if (regsubkey_ctr_numkeys(key->subkeys) > 0) {
 736                 err = WERR_ACCESS_DENIED;
 737                 goto trans_done;
 738         }
 739         err = reg_deletekey_internal(mem_ctx, parent, path, false);
 740
 741 trans_done:
 742         if (W_ERROR_IS_OK(err)) {
 743                 err = regdb_transaction_commit();
 744                 if (!W_ERROR_IS_OK(err)) {
 745                         DEBUG(0, ("reg_deletekey: Error committing transaction: %s\n", win_errstr(err)));
 746                 }
 747         } else {
 748                 WERROR err1 = regdb_transaction_cancel();
 749                 if (!W_ERROR_IS_OK(err1)) {
 750                         DEBUG(0, ("reg_deletekey: Error cancelling transaction: %s\n", win_errstr(err1)));
 751                 }
 752         }
 753
 754 done:
 755         TALLOC_FREE(mem_ctx);
 756         return err;
 757 }
 758
 759
 760 WERROR reg_setvalue(struct registry_key *key, const char *name,
 761                     const struct registry_value *val)
 762 {
 763         struct regval_blob *existing;
 764         WERROR err;
 765         int res;
 766
 767         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 768                 return WERR_ACCESS_DENIED;
 769         }
 770
 771         err = regdb_transaction_start();
 772         if (!W_ERROR_IS_OK(err)) {
 773                 DEBUG(0, ("reg_setvalue: Failed to start transaction: %s\n",
 774                           win_errstr(err)));
 775                 return err;
 776         }
 777
 778         err = fill_value_cache(key);
 779         if (!W_ERROR_IS_OK(err)) {
 780                 DEBUG(0, ("reg_setvalue: Error filling value cache: %s\n", win_errstr(err)));
 781                 goto done;
 782         }
 783
 784         existing = regval_ctr_getvalue(key->values, name);
 785
 786         if ((existing != NULL) &&
 787             (regval_size(existing) == val->data.length) &&
 788             (memcmp(regval_data_p(existing), val->data.data,
 789                     val->data.length) == 0))
 790         {
 791                 err = WERR_OK;
 792                 goto done;
 793         }
 794
 795         res = regval_ctr_addvalue(key->values, name, val->type,
 796                                   val->data.data, val->data.length);
 797
 798         if (res == 0) {
 799                 TALLOC_FREE(key->values);
 800                 err = WERR_NOMEM;
 801                 goto done;
 802         }
 803
 804         if (!store_reg_values(key->key, key->values)) {
 805                 TALLOC_FREE(key->values);
 806                 DEBUG(0, ("reg_setvalue: store_reg_values failed\n"));
 807                 err = WERR_REG_IO_FAILURE;
 808                 goto done;
 809         }
 810
 811         err = WERR_OK;
 812
 813 done:
 814         if (W_ERROR_IS_OK(err)) {
 815                 err = regdb_transaction_commit();
 816                 if (!W_ERROR_IS_OK(err)) {
 817                         DEBUG(0, ("reg_setvalue: Error committing transaction: %s\n", win_errstr(err)));
 818                 }
 819         } else {
 820                 WERROR err1 = regdb_transaction_cancel();
 821                 if (!W_ERROR_IS_OK(err1)) {
 822                         DEBUG(0, ("reg_setvalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 823                 }
 824         }
 825
 826         return err;
 827 }
 828
 829 static WERROR reg_value_exists(struct registry_key *key, const char *name)
 830 {
 831         struct regval_blob *blob;
 832
 833         blob = regval_ctr_getvalue(key->values, name);
 834
 835         if (blob == NULL) {
 836                 return WERR_BADFILE;
 837         } else {
 838                 return WERR_OK;
 839         }
 840 }
 841
 842 WERROR reg_deletevalue(struct registry_key *key, const char *name)
 843 {
 844         WERROR err;
 845
 846         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 847                 return WERR_ACCESS_DENIED;
 848         }
 849
 850         err = regdb_transaction_start();
 851         if (!W_ERROR_IS_OK(err)) {
 852                 DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n",
 853                           win_errstr(err)));
 854                 return err;
 855         }
 856
 857         err = fill_value_cache(key);
 858         if (!W_ERROR_IS_OK(err)) {
 859                 DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n",
 860                           win_errstr(err)));
 861                 goto done;
 862         }
 863
 864         err = reg_value_exists(key, name);
 865         if (!W_ERROR_IS_OK(err)) {
 866                 goto done;
 867         }
 868
 869         regval_ctr_delvalue(key->values, name);
 870
 871         if (!store_reg_values(key->key, key->values)) {
 872                 TALLOC_FREE(key->values);
 873                 err = WERR_REG_IO_FAILURE;
 874                 DEBUG(0, ("reg_deletevalue: store_reg_values failed\n"));
 875                 goto done;
 876         }
 877
 878         err = WERR_OK;
 879
 880 done:
 881         if (W_ERROR_IS_OK(err)) {
 882                 err = regdb_transaction_commit();
 883                 if (!W_ERROR_IS_OK(err)) {
 884                         DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err)));
 885                 }
 886         } else {
 887                 WERROR err1 = regdb_transaction_cancel();
 888                 if (!W_ERROR_IS_OK(err1)) {
 889                         DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1)));
 890                 }
 891         }
 892
 893         return err;
 894 }
 895
 896 WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key,
 897                           struct security_descriptor **psecdesc)
 898 {
 899         return regkey_get_secdesc(mem_ctx, key->key, psecdesc);
 900 }
 901
 902 WERROR reg_setkeysecurity(struct registry_key *key,
 903                           struct security_descriptor *psecdesc)
 904 {
 905         return regkey_set_secdesc(key->key, psecdesc);
 906 }
 907
 908 WERROR reg_getversion(uint32_t *version)
 909 {
 910         if (version == NULL) {
 911                 return WERR_INVALID_PARAM;
 912         }
 913
 914         *version = 0x00000005; /* Windows 2000 registry API version */
 915         return WERR_OK;
 916 }
 917
 918 /**********************************************************************
 919  * Higher level utility functions
 920  **********************************************************************/
 921
 922 WERROR reg_deleteallvalues(struct registry_key *key)
 923 {
 924         WERROR err;
 925         int i;
 926
 927         if (!(key->key->access_granted & KEY_SET_VALUE)) {
 928                 return WERR_ACCESS_DENIED;
 929         }
 930
 931         if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
 932                 return err;
 933         }
 934
 935         for (i=0; i < regval_ctr_numvals(key->values); i++) {
 936                 struct regval_blob *blob;
 937                 blob = regval_ctr_specific_value(key->values, i);
 938                 regval_ctr_delvalue(key->values, regval_name(blob));
 939         }
 940
 941         if (!store_reg_values(key->key, key->values)) {
 942                 TALLOC_FREE(key->values);
 943                 return WERR_REG_IO_FAILURE;
 944         }
 945
 946         return WERR_OK;
 947 }
 948
 949 /*
 950  * Utility function to delete a registry key with all its subkeys.
 951  * Note that reg_deletekey returns ACCESS_DENIED when called on a
 952  * key that has subkeys.
 953  */
 954 static WERROR reg_deletekey_recursive_internal(struct registry_key *parent,
 955                                                const char *path,
 956                                                bool del_key, bool lazy)
 957 {
 958         WERROR werr = WERR_OK;
 959         struct registry_key *key;
 960         char *subkey_name = NULL;
 961         uint32_t i;
 962         TALLOC_CTX *mem_ctx = talloc_stackframe();
 963
 964         DEBUG(5, ("reg_deletekey_recursive_internal: deleting '%s' from '%s'\n",
 965                   path, parent->key->name));
 966
 967         /* recurse through subkeys first */
 968         werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
 969         if (!W_ERROR_IS_OK(werr)) {
 970                 DEBUG(3, ("reg_deletekey_recursive_internal: error opening "
 971                           "subkey '%s' of '%s': '%s'\n",
 972                           path, parent->key->name, win_errstr(werr)));
 973                 goto done;
 974         }
 975
 976         werr = fill_subkey_cache(key);
 977         W_ERROR_NOT_OK_GOTO_DONE(werr);
 978
 979         /*
 980          * loop from top to bottom for perfomance:
 981          * this way, we need to rehash the regsubkey containers less
 982          */
 983         for (i = regsubkey_ctr_numkeys(key->subkeys) ; i > 0; i--) {
 984                 subkey_name = regsubkey_ctr_specific_key(key->subkeys, i-1);
 985                 werr = reg_deletekey_recursive_internal(key, subkey_name, true, del_key);
 986                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 987         }
 988
 989         if (del_key) {
 990                 /* now delete the actual key */
 991                 werr = reg_deletekey_internal(mem_ctx, parent, path, lazy);
 992         }
 993
 994 done:
 995
 996         DEBUG(5, ("reg_deletekey_recursive_internal: done deleting '%s' from "
 997                   "'%s': %s\n",
 998                   path, parent->key->name, win_errstr(werr)));
 999         TALLOC_FREE(mem_ctx);
1000         return werr;
1001 }
1002
1003 static WERROR reg_deletekey_recursive_trans(struct registry_key *parent,
1004                                             const char *path,
1005                                             bool del_key)
1006 {
1007         WERROR werr;
1008
1009         werr = regdb_transaction_start();
1010         if (!W_ERROR_IS_OK(werr)) {
1011                 DEBUG(0, ("reg_deletekey_recursive_trans: "
1012                           "error starting transaction: %s\n",
1013                           win_errstr(werr)));
1014                 return werr;
1015         }
1016
1017         werr = reg_deletekey_recursive_internal(parent, path, del_key, false);
1018
1019         if (!W_ERROR_IS_OK(werr)) {
1020                 WERROR werr2;
1021                 DEBUG(W_ERROR_EQUAL(werr, WERR_BADFILE) ? 5 : 1,
1022                       (__location__ ": failed to delete key '%s' from key "
1023                        "'%s': %s\n", path, parent->key->name,
1024                        win_errstr(werr)));
1025
1026                 werr2 = regdb_transaction_cancel();
1027                 if (!W_ERROR_IS_OK(werr2)) {
1028                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1029                                   "error cancelling transaction: %s\n",
1030                                   win_errstr(werr2)));
1031                         /*
1032                          * return the original werr or the
1033                          * error from cancelling the transaction?
1034                          */
1035                 }
1036         } else {
1037                 werr = regdb_transaction_commit();
1038                 if (!W_ERROR_IS_OK(werr)) {
1039                         DEBUG(0, ("reg_deletekey_recursive_trans: "
1040                                   "error committing transaction: %s\n",
1041                                   win_errstr(werr)));
1042                 } else {
1043                         DEBUG(5, ("reg_deletekey_recursive_trans: deleted key '%s' from '%s'\n",
1044                                   path, parent->key->name));
1045
1046                 }
1047         }
1048
1049         return werr;
1050 }
1051
1052 WERROR reg_deletekey_recursive(struct registry_key *parent,
1053                                const char *path)
1054 {
1055         return reg_deletekey_recursive_trans(parent, path, true);
1056 }
1057
1058 WERROR reg_deletesubkeys_recursive(struct registry_key *parent,
1059                                    const char *path)
1060 {
1061         return reg_deletekey_recursive_trans(parent, path, false);
1062 }
1063