mirror of
https://github.com/samba-team/samba.git
synced 2024-12-25 23:21:54 +03:00
b6eaf05479
Michael
(This used to be commit d3c9c27374
)
797 lines
17 KiB
C
797 lines
17 KiB
C
/*
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* Unix SMB/CIFS implementation.
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* Virtual Windows Registry Layer
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* Copyright (C) Volker Lendecke 2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* Attempt to wrap the existing API in a more winreg.idl-like way */
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#include "includes.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_REGISTRY
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/**********************************************************************
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* Helper functions
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**********************************************************************/
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static WERROR fill_value_cache(struct registry_key *key)
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{
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if (key->values != NULL) {
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if (!reg_values_need_update(key->key, key->values)) {
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return WERR_OK;
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}
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}
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if (!(key->values = TALLOC_ZERO_P(key, REGVAL_CTR))) {
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return WERR_NOMEM;
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}
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if (fetch_reg_values(key->key, key->values) == -1) {
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TALLOC_FREE(key->values);
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return WERR_BADFILE;
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}
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return WERR_OK;
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}
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static WERROR fill_subkey_cache(struct registry_key *key)
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{
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if (key->subkeys != NULL) {
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if (!reg_subkeys_need_update(key->key, key->subkeys)) {
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return WERR_OK;
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}
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}
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if (!(key->subkeys = TALLOC_ZERO_P(key, REGSUBKEY_CTR))) {
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return WERR_NOMEM;
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}
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if (fetch_reg_keys(key->key, key->subkeys) == -1) {
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TALLOC_FREE(key->subkeys);
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return WERR_NO_MORE_ITEMS;
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}
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return WERR_OK;
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}
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static int regkey_destructor(REGISTRY_KEY *key)
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{
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return regdb_close();
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}
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static WERROR regkey_open_onelevel(TALLOC_CTX *mem_ctx,
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struct registry_key *parent,
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const char *name,
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const struct nt_user_token *token,
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uint32 access_desired,
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struct registry_key **pregkey)
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{
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WERROR result = WERR_OK;
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struct registry_key *regkey;
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REGISTRY_KEY *key;
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REGSUBKEY_CTR *subkeys = NULL;
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DEBUG(7,("regkey_open_onelevel: name = [%s]\n", name));
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SMB_ASSERT(strchr(name, '\\') == NULL);
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if (!(regkey = TALLOC_ZERO_P(mem_ctx, struct registry_key)) ||
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!(regkey->token = dup_nt_token(regkey, token)) ||
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!(regkey->key = TALLOC_ZERO_P(regkey, REGISTRY_KEY))) {
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result = WERR_NOMEM;
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goto done;
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}
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if ( !(W_ERROR_IS_OK(result = regdb_open())) ) {
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goto done;
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}
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key = regkey->key;
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talloc_set_destructor(key, regkey_destructor);
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/* initialization */
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key->type = REG_KEY_GENERIC;
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if (name[0] == '\0') {
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/*
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* Open a copy of the parent key
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*/
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if (!parent) {
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result = WERR_BADFILE;
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goto done;
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}
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key->name = talloc_strdup(key, parent->key->name);
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}
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else {
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/*
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* Normal subkey open
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*/
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key->name = talloc_asprintf(key, "%s%s%s",
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parent ? parent->key->name : "",
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parent ? "\\": "",
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name);
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}
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if (key->name == NULL) {
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result = WERR_NOMEM;
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goto done;
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}
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/* Tag this as a Performance Counter Key */
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if( StrnCaseCmp(key->name, KEY_HKPD, strlen(KEY_HKPD)) == 0 )
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key->type = REG_KEY_HKPD;
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/* Look up the table of registry I/O operations */
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if ( !(key->hook = reghook_cache_find( key->name )) ) {
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DEBUG(0,("reg_open_onelevel: Failed to assigned a "
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"REGISTRY_HOOK to [%s]\n", key->name ));
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result = WERR_BADFILE;
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goto done;
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}
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/* check if the path really exists; failed is indicated by -1 */
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/* if the subkey count failed, bail out */
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if ( !(subkeys = TALLOC_ZERO_P( key, REGSUBKEY_CTR )) ) {
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result = WERR_NOMEM;
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goto done;
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}
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if ( fetch_reg_keys( key, subkeys ) == -1 ) {
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result = WERR_BADFILE;
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goto done;
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}
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TALLOC_FREE( subkeys );
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if ( !regkey_access_check( key, access_desired, &key->access_granted,
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token ) ) {
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result = WERR_ACCESS_DENIED;
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goto done;
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}
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*pregkey = regkey;
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result = WERR_OK;
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done:
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if ( !W_ERROR_IS_OK(result) ) {
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TALLOC_FREE(regkey);
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}
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return result;
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}
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WERROR reg_openhive(TALLOC_CTX *mem_ctx, const char *hive,
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uint32 desired_access,
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const struct nt_user_token *token,
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struct registry_key **pkey)
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{
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SMB_ASSERT(hive != NULL);
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SMB_ASSERT(hive[0] != '\0');
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SMB_ASSERT(strchr(hive, '\\') == NULL);
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return regkey_open_onelevel(mem_ctx, NULL, hive, token, desired_access,
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pkey);
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}
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/**********************************************************************
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* The API functions
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**********************************************************************/
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WERROR reg_openkey(TALLOC_CTX *mem_ctx, struct registry_key *parent,
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const char *name, uint32 desired_access,
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struct registry_key **pkey)
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{
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struct registry_key *direct_parent = parent;
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WERROR err;
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char *p, *path, *to_free;
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size_t len;
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if (!(path = SMB_STRDUP(name))) {
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return WERR_NOMEM;
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}
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to_free = path;
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len = strlen(path);
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if ((len > 0) && (path[len-1] == '\\')) {
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path[len-1] = '\0';
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}
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while ((p = strchr(path, '\\')) != NULL) {
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char *name_component;
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struct registry_key *tmp;
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if (!(name_component = SMB_STRNDUP(path, (p - path)))) {
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err = WERR_NOMEM;
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goto error;
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}
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err = regkey_open_onelevel(mem_ctx, direct_parent,
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name_component, parent->token,
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SEC_RIGHTS_ENUM_SUBKEYS, &tmp);
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SAFE_FREE(name_component);
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if (!W_ERROR_IS_OK(err)) {
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goto error;
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}
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if (direct_parent != parent) {
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TALLOC_FREE(direct_parent);
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}
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direct_parent = tmp;
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path = p+1;
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}
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err = regkey_open_onelevel(mem_ctx, direct_parent, path, parent->token,
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desired_access, pkey);
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error:
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if (direct_parent != parent) {
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TALLOC_FREE(direct_parent);
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}
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SAFE_FREE(to_free);
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return err;
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}
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WERROR reg_enumkey(TALLOC_CTX *mem_ctx, struct registry_key *key,
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uint32 idx, char **name, NTTIME *last_write_time)
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{
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WERROR err;
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if (!(key->key->access_granted & SEC_RIGHTS_ENUM_SUBKEYS)) {
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return WERR_ACCESS_DENIED;
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}
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if (!W_ERROR_IS_OK(err = fill_subkey_cache(key))) {
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return err;
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}
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if (idx >= key->subkeys->num_subkeys) {
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return WERR_NO_MORE_ITEMS;
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}
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if (!(*name = talloc_strdup(mem_ctx, key->subkeys->subkeys[idx]))) {
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return WERR_NOMEM;
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}
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if (last_write_time) {
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*last_write_time = 0;
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}
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return WERR_OK;
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}
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WERROR reg_enumvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
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uint32 idx, char **pname, struct registry_value **pval)
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{
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struct registry_value *val;
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WERROR err;
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if (!(key->key->access_granted & SEC_RIGHTS_QUERY_VALUE)) {
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return WERR_ACCESS_DENIED;
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}
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if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
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return err;
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}
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if (idx >= key->values->num_values) {
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return WERR_NO_MORE_ITEMS;
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}
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err = registry_pull_value(mem_ctx, &val,
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key->values->values[idx]->type,
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key->values->values[idx]->data_p,
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key->values->values[idx]->size,
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key->values->values[idx]->size);
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if (!W_ERROR_IS_OK(err)) {
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return err;
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}
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if (pname
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&& !(*pname = talloc_strdup(
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mem_ctx, key->values->values[idx]->valuename))) {
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SAFE_FREE(val);
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return WERR_NOMEM;
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}
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*pval = val;
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return WERR_OK;
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}
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WERROR reg_queryvalue(TALLOC_CTX *mem_ctx, struct registry_key *key,
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const char *name, struct registry_value **pval)
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{
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WERROR err;
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uint32 i;
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if (!(key->key->access_granted & SEC_RIGHTS_QUERY_VALUE)) {
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return WERR_ACCESS_DENIED;
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}
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if (!(W_ERROR_IS_OK(err = fill_value_cache(key)))) {
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return err;
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}
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for (i=0; i<key->values->num_values; i++) {
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if (strequal(key->values->values[i]->valuename, name)) {
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return reg_enumvalue(mem_ctx, key, i, NULL, pval);
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}
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}
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return WERR_BADFILE;
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}
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WERROR reg_queryinfokey(struct registry_key *key, uint32_t *num_subkeys,
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uint32_t *max_subkeylen, uint32_t *max_subkeysize,
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uint32_t *num_values, uint32_t *max_valnamelen,
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uint32_t *max_valbufsize, uint32_t *secdescsize,
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NTTIME *last_changed_time)
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{
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uint32 i, max_size;
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size_t max_len;
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TALLOC_CTX *mem_ctx;
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WERROR err;
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struct security_descriptor *secdesc;
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if (!(key->key->access_granted & SEC_RIGHTS_QUERY_VALUE)) {
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return WERR_ACCESS_DENIED;
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}
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if (!W_ERROR_IS_OK(fill_subkey_cache(key)) ||
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!W_ERROR_IS_OK(fill_value_cache(key))) {
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return WERR_BADFILE;
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}
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max_len = 0;
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for (i=0; i<key->subkeys->num_subkeys; i++) {
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max_len = MAX(max_len, strlen(key->subkeys->subkeys[i]));
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}
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*num_subkeys = key->subkeys->num_subkeys;
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*max_subkeylen = max_len;
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*max_subkeysize = 0; /* Class length? */
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max_len = 0;
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max_size = 0;
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for (i=0; i<key->values->num_values; i++) {
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max_len = MAX(max_len,
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strlen(key->values->values[i]->valuename));
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max_size = MAX(max_size, key->values->values[i]->size);
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}
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*num_values = key->values->num_values;
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*max_valnamelen = max_len;
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*max_valbufsize = max_size;
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if (!(mem_ctx = talloc_new(key))) {
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return WERR_NOMEM;
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}
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err = regkey_get_secdesc(mem_ctx, key->key, &secdesc);
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if (!W_ERROR_IS_OK(err)) {
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TALLOC_FREE(mem_ctx);
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return err;
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}
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*secdescsize = ndr_size_security_descriptor(secdesc, 0);
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TALLOC_FREE(mem_ctx);
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*last_changed_time = 0;
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return WERR_OK;
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}
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WERROR reg_createkey(TALLOC_CTX *ctx, struct registry_key *parent,
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const char *subkeypath, uint32 desired_access,
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struct registry_key **pkey,
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enum winreg_CreateAction *paction)
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{
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struct registry_key *key = parent;
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struct registry_key *create_parent;
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TALLOC_CTX *mem_ctx;
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char *path, *end;
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WERROR err;
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REGSUBKEY_CTR *subkeys;
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if (!(mem_ctx = talloc_new(ctx))) return WERR_NOMEM;
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if (!(path = talloc_strdup(mem_ctx, subkeypath))) {
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err = WERR_NOMEM;
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goto done;
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}
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while ((end = strchr(path, '\\')) != NULL) {
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struct registry_key *tmp;
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enum winreg_CreateAction action;
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*end = '\0';
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err = reg_createkey(mem_ctx, key, path,
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SEC_RIGHTS_ENUM_SUBKEYS, &tmp, &action);
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if (!W_ERROR_IS_OK(err)) {
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goto done;
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}
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if (key != parent) {
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TALLOC_FREE(key);
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}
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key = tmp;
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path = end+1;
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}
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/*
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* At this point, "path" contains the one-element subkey of "key". We
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* can try to open it.
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*/
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err = reg_openkey(ctx, key, path, desired_access, pkey);
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if (W_ERROR_IS_OK(err)) {
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if (paction != NULL) {
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*paction = REG_OPENED_EXISTING_KEY;
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}
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goto done;
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}
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if (!W_ERROR_EQUAL(err, WERR_BADFILE)) {
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/*
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* Something but "notfound" has happened, so bail out
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*/
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goto done;
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}
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/*
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* We have to make a copy of the current key, as we opened it only
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* with ENUM_SUBKEY access.
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*/
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err = reg_openkey(mem_ctx, key, "", SEC_RIGHTS_CREATE_SUBKEY,
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&create_parent);
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if (!W_ERROR_IS_OK(err)) {
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goto done;
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}
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/*
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* Actually create the subkey
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*/
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if (!(subkeys = TALLOC_ZERO_P(mem_ctx, REGSUBKEY_CTR))) {
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err = WERR_NOMEM;
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goto done;
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}
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err = fill_subkey_cache(create_parent);
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if (!W_ERROR_IS_OK(err)) goto done;
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err = regsubkey_ctr_addkey(create_parent->subkeys, path);
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if (!W_ERROR_IS_OK(err)) goto done;
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if (!store_reg_keys(create_parent->key, create_parent->subkeys)) {
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TALLOC_FREE(create_parent->subkeys);
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err = WERR_REG_IO_FAILURE;
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goto done;
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}
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/*
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* Now open the newly created key
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*/
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err = reg_openkey(ctx, create_parent, path, desired_access, pkey);
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if (W_ERROR_IS_OK(err) && (paction != NULL)) {
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*paction = REG_CREATED_NEW_KEY;
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}
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done:
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TALLOC_FREE(mem_ctx);
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return err;
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}
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WERROR reg_deletekey(struct registry_key *parent, const char *path)
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{
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WERROR err;
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TALLOC_CTX *mem_ctx;
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char *name, *end;
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int num_subkeys;
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struct registry_key *tmp_key, *key;
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if (!(mem_ctx = talloc_init("reg_createkey"))) return WERR_NOMEM;
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if (!(name = talloc_strdup(mem_ctx, path))) {
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err = WERR_NOMEM;
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goto error;
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}
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/* check if the key has subkeys */
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err = reg_openkey(mem_ctx, parent, name, REG_KEY_READ, &key);
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if (!W_ERROR_IS_OK(err)) {
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goto error;
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}
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if (!W_ERROR_IS_OK(err = fill_subkey_cache(key))) {
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goto error;
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}
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if (key->subkeys->num_subkeys > 0) {
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err = WERR_ACCESS_DENIED;
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goto error;
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}
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/* no subkeys - proceed with delete */
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if ((end = strrchr(name, '\\')) != NULL) {
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*end = '\0';
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err = reg_openkey(mem_ctx, parent, name,
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SEC_RIGHTS_CREATE_SUBKEY, &tmp_key);
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if (!W_ERROR_IS_OK(err)) {
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goto error;
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}
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parent = tmp_key;
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name = end+1;
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}
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if (name[0] == '\0') {
|
|
err = WERR_INVALID_PARAM;
|
|
goto error;
|
|
}
|
|
|
|
if (!W_ERROR_IS_OK(err = fill_subkey_cache(parent))) {
|
|
goto error;
|
|
}
|
|
|
|
num_subkeys = parent->subkeys->num_subkeys;
|
|
|
|
if (regsubkey_ctr_delkey(parent->subkeys, name) == num_subkeys) {
|
|
err = WERR_BADFILE;
|
|
goto error;
|
|
}
|
|
|
|
if (!store_reg_keys(parent->key, parent->subkeys)) {
|
|
TALLOC_FREE(parent->subkeys);
|
|
err = WERR_REG_IO_FAILURE;
|
|
goto error;
|
|
}
|
|
|
|
regkey_set_secdesc(key->key, NULL);
|
|
|
|
err = WERR_OK;
|
|
|
|
error:
|
|
TALLOC_FREE(mem_ctx);
|
|
return err;
|
|
}
|
|
|
|
WERROR reg_setvalue(struct registry_key *key, const char *name,
|
|
const struct registry_value *val)
|
|
{
|
|
WERROR err;
|
|
DATA_BLOB value_data;
|
|
int res;
|
|
|
|
if (!(key->key->access_granted & SEC_RIGHTS_SET_VALUE)) {
|
|
return WERR_ACCESS_DENIED;
|
|
}
|
|
|
|
if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
|
|
return err;
|
|
}
|
|
|
|
err = registry_push_value(key, val, &value_data);
|
|
if (!W_ERROR_IS_OK(err)) {
|
|
return err;
|
|
}
|
|
|
|
res = regval_ctr_addvalue(key->values, name, val->type,
|
|
(char *)value_data.data, value_data.length);
|
|
TALLOC_FREE(value_data.data);
|
|
|
|
if (res == 0) {
|
|
TALLOC_FREE(key->values);
|
|
return WERR_NOMEM;
|
|
}
|
|
|
|
if (!store_reg_values(key->key, key->values)) {
|
|
TALLOC_FREE(key->values);
|
|
return WERR_REG_IO_FAILURE;
|
|
}
|
|
|
|
return WERR_OK;
|
|
}
|
|
|
|
WERROR reg_deletevalue(struct registry_key *key, const char *name)
|
|
{
|
|
WERROR err;
|
|
|
|
if (!(key->key->access_granted & SEC_RIGHTS_SET_VALUE)) {
|
|
return WERR_ACCESS_DENIED;
|
|
}
|
|
|
|
if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
|
|
return err;
|
|
}
|
|
|
|
regval_ctr_delvalue(key->values, name);
|
|
|
|
if (!store_reg_values(key->key, key->values)) {
|
|
TALLOC_FREE(key->values);
|
|
return WERR_REG_IO_FAILURE;
|
|
}
|
|
|
|
return WERR_OK;
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* Higher level utility functions
|
|
**********************************************************************/
|
|
|
|
WERROR reg_deleteallvalues(struct registry_key *key)
|
|
{
|
|
WERROR err;
|
|
int i;
|
|
|
|
if (!(key->key->access_granted & SEC_RIGHTS_SET_VALUE)) {
|
|
return WERR_ACCESS_DENIED;
|
|
}
|
|
|
|
if (!W_ERROR_IS_OK(err = fill_value_cache(key))) {
|
|
return err;
|
|
}
|
|
|
|
for (i=0; i<key->values->num_values; i++) {
|
|
regval_ctr_delvalue(key->values, key->values->values[i]->valuename);
|
|
}
|
|
|
|
if (!store_reg_values(key->key, key->values)) {
|
|
TALLOC_FREE(key->values);
|
|
return WERR_REG_IO_FAILURE;
|
|
}
|
|
|
|
return WERR_OK;
|
|
}
|
|
|
|
/*
|
|
* Utility function to open a complete registry path including the hive
|
|
* prefix. This should become the replacement function for
|
|
* regkey_open_internal.
|
|
*/
|
|
|
|
WERROR reg_open_path(TALLOC_CTX *mem_ctx, const char *orig_path,
|
|
uint32 desired_access, const struct nt_user_token *token,
|
|
struct registry_key **pkey)
|
|
{
|
|
struct registry_key *hive, *key;
|
|
char *path, *p;
|
|
WERROR err;
|
|
|
|
if (!(path = SMB_STRDUP(orig_path))) {
|
|
return WERR_NOMEM;
|
|
}
|
|
|
|
p = strchr(path, '\\');
|
|
|
|
if ((p == NULL) || (p[1] == '\0')) {
|
|
/*
|
|
* No key behind the hive, just return the hive
|
|
*/
|
|
|
|
err = reg_openhive(mem_ctx, path, desired_access, token,
|
|
&hive);
|
|
if (!W_ERROR_IS_OK(err)) {
|
|
SAFE_FREE(path);
|
|
return err;
|
|
}
|
|
SAFE_FREE(path);
|
|
*pkey = hive;
|
|
return WERR_OK;
|
|
}
|
|
|
|
*p = '\0';
|
|
|
|
err = reg_openhive(mem_ctx, path, SEC_RIGHTS_ENUM_SUBKEYS, token,
|
|
&hive);
|
|
if (!W_ERROR_IS_OK(err)) {
|
|
SAFE_FREE(path);
|
|
return err;
|
|
}
|
|
|
|
err = reg_openkey(mem_ctx, hive, p+1, desired_access, &key);
|
|
|
|
TALLOC_FREE(hive);
|
|
SAFE_FREE(path);
|
|
|
|
if (!W_ERROR_IS_OK(err)) {
|
|
return err;
|
|
}
|
|
|
|
*pkey = key;
|
|
return WERR_OK;
|
|
}
|
|
|
|
/*
|
|
* Utility function to delete a registry key with all its subkeys.
|
|
* Note that reg_deletekey returns ACCESS_DENIED when called on a
|
|
* key that has subkeys.
|
|
*/
|
|
static WERROR reg_deletekey_recursive_internal(TALLOC_CTX *ctx,
|
|
struct registry_key *parent,
|
|
const char *path,
|
|
bool del_key)
|
|
{
|
|
TALLOC_CTX *mem_ctx = NULL;
|
|
WERROR werr = WERR_OK;
|
|
struct registry_key *key;
|
|
char *subkey_name = NULL;
|
|
|
|
mem_ctx = talloc_new(ctx);
|
|
if (mem_ctx == NULL) {
|
|
werr = WERR_NOMEM;
|
|
goto done;
|
|
}
|
|
|
|
/* recurse through subkeys first */
|
|
werr = reg_openkey(mem_ctx, parent, path, REG_KEY_ALL, &key);
|
|
if (!W_ERROR_IS_OK(werr)) {
|
|
goto done;
|
|
}
|
|
|
|
while (W_ERROR_IS_OK(werr = reg_enumkey(mem_ctx, key, 0,
|
|
&subkey_name, NULL)))
|
|
{
|
|
werr = reg_deletekey_recursive_internal(mem_ctx, key,
|
|
subkey_name,
|
|
true);
|
|
if (!W_ERROR_IS_OK(werr)) {
|
|
goto done;
|
|
}
|
|
}
|
|
if (!W_ERROR_EQUAL(WERR_NO_MORE_ITEMS, werr)) {
|
|
DEBUG(1, ("reg_deletekey_recursive_internal: "
|
|
"Error enumerating subkeys: %s\n",
|
|
dos_errstr(werr)));
|
|
goto done;
|
|
}
|
|
|
|
werr = WERR_OK;
|
|
|
|
if (del_key) {
|
|
/* now delete the actual key */
|
|
werr = reg_deletekey(parent, path);
|
|
}
|
|
|
|
done:
|
|
TALLOC_FREE(mem_ctx);
|
|
return werr;
|
|
}
|
|
|
|
WERROR reg_deletekey_recursive(TALLOC_CTX *ctx,
|
|
struct registry_key *parent,
|
|
const char *path)
|
|
{
|
|
return reg_deletekey_recursive_internal(ctx, parent, path, true);
|
|
}
|
|
|
|
WERROR reg_deletesubkeys_recursive(TALLOC_CTX *ctx,
|
|
struct registry_key *parent,
|
|
const char *path)
|
|
{
|
|
return reg_deletekey_recursive_internal(ctx, parent, path, false);
|
|
}
|