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/*
* Unix SMB/CIFS implementation.
* Virtual Windows Registry Layer
* Copyright (C) Gerald Carter 2002-2005
* Copyright (C) Michael Adam 2006-2008
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Implementation of registry frontend view functions.
* Functions moved from reg_frontend.c to minimize linker deps.
*/
#include "includes.h"
#include "system/passwd.h" /* uid_wrapper */
#include "registry.h"
#include "reg_dispatcher.h"
#include "../libcli/security/security.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_REGISTRY
static const struct generic_mapping reg_generic_map =
{ REG_KEY_READ, REG_KEY_WRITE, REG_KEY_EXECUTE, REG_KEY_ALL };
/********************************************************************
********************************************************************/
static WERROR construct_registry_sd(TALLOC_CTX *ctx, struct security_descriptor **psd)
{
struct security_ace ace[3];
size_t i = 0;
struct security_descriptor *sd;
struct security_acl *theacl;
size_t sd_size;
/* basic access for Everyone */
init_sec_ace(&ace[i++], &global_sid_World, SEC_ACE_TYPE_ACCESS_ALLOWED,
REG_KEY_READ, 0);
/* Full Access 'BUILTIN\Administrators' */
init_sec_ace(&ace[i++], &global_sid_Builtin_Administrators,
SEC_ACE_TYPE_ACCESS_ALLOWED, REG_KEY_ALL, 0);
/* Full Access 'NT Authority\System' */
init_sec_ace(&ace[i++], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
REG_KEY_ALL, 0);
/* create the security descriptor */
theacl = make_sec_acl(ctx, NT4_ACL_REVISION, i, ace);
if (theacl == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
sd = make_sec_desc(ctx, SD_REVISION, SEC_DESC_SELF_RELATIVE,
&global_sid_Builtin_Administrators,
&global_sid_System, NULL, theacl,
&sd_size);
if (sd == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
*psd = sd;
return WERR_OK;
}
/***********************************************************************
High level wrapper function for storing registry subkeys
***********************************************************************/
bool store_reg_keys(struct registry_key_handle *key,
struct regsubkey_ctr *subkeys)
{
if (key->ops && key->ops->store_subkeys)
return key->ops->store_subkeys(key->name, subkeys);
return false;
}
/***********************************************************************
High level wrapper function for storing registry values
***********************************************************************/
bool store_reg_values(struct registry_key_handle *key, struct regval_ctr *val)
{
if (key->ops && key->ops->store_values)
return key->ops->store_values(key->name, val);
return false;
}
WERROR create_reg_subkey(struct registry_key_handle *key, const char *subkey)
{
if (key->ops && key->ops->create_subkey) {
return key->ops->create_subkey(key->name, subkey);
}
return WERR_NOT_SUPPORTED;
}
WERROR delete_reg_subkey(struct registry_key_handle *key, const char *subkey, bool lazy)
{
if (key->ops && key->ops->delete_subkey) {
return key->ops->delete_subkey(key->name, subkey, lazy);
}
return WERR_NOT_SUPPORTED;
}
/***********************************************************************
High level wrapper function for enumerating registry subkeys
Initialize the TALLOC_CTX if necessary
***********************************************************************/
int fetch_reg_keys(struct registry_key_handle *key,
struct regsubkey_ctr *subkey_ctr)
{
int result = -1;
if (key->ops && key->ops->fetch_subkeys)
result = key->ops->fetch_subkeys(key->name, subkey_ctr);
return result;
}
/***********************************************************************
High level wrapper function for enumerating registry values
***********************************************************************/
int fetch_reg_values(struct registry_key_handle *key, struct regval_ctr *val)
{
int result = -1;
DEBUG(10, ("fetch_reg_values called for key '%s' (ops %p)\n", key->name,
(key->ops) ? (void *)key->ops : NULL));
if (key->ops && key->ops->fetch_values)
result = key->ops->fetch_values(key->name, val);
return result;
}
/***********************************************************************
High level access check for passing the required access mask to the
underlying registry backend
***********************************************************************/
bool regkey_access_check(struct registry_key_handle *key, uint32_t requested,
uint32_t *granted,
const struct security_token *token )
{
struct security_descriptor *sec_desc;
NTSTATUS status;
WERROR err;
/* root free-pass, like we have on all other pipes like samr, lsa, etc. */
if (root_mode()) {
*granted = REG_KEY_ALL;
return true;
}
/* use the default security check if the backend has not defined its
* own */
if (key->ops && key->ops->reg_access_check) {
return key->ops->reg_access_check(key->name, requested,
granted, token);
}
err = regkey_get_secdesc(talloc_tos(), key, &sec_desc);
if (!W_ERROR_IS_OK(err)) {
return false;
}
se_map_generic( &requested, ®_generic_map );
status =se_access_check(sec_desc, token, requested, granted);
TALLOC_FREE(sec_desc);
if (!NT_STATUS_IS_OK(status)) {
return false;
}
return NT_STATUS_IS_OK(status);
}
WERROR regkey_get_secdesc(TALLOC_CTX *mem_ctx, struct registry_key_handle *key,
struct security_descriptor **psecdesc)
{
struct security_descriptor *secdesc;
WERROR werr;
if (key->ops && key->ops->get_secdesc) {
werr = key->ops->get_secdesc(mem_ctx, key->name, psecdesc);
if (W_ERROR_IS_OK(werr)) {
return WERR_OK;
}
}
werr = construct_registry_sd(mem_ctx, &secdesc);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
*psecdesc = secdesc;
return WERR_OK;
}
WERROR regkey_set_secdesc(struct registry_key_handle *key,
struct security_descriptor *psecdesc)
{
if (key->ops && key->ops->set_secdesc) {
return key->ops->set_secdesc(key->name, psecdesc);
}
return WERR_ACCESS_DENIED;
}
/**
* Check whether the in-memory version of the subkyes of a
* registry key needs update from disk.
*/
bool reg_subkeys_need_update(struct registry_key_handle *key,
struct regsubkey_ctr *subkeys)
{
if (key->ops && key->ops->subkeys_need_update)
{
return key->ops->subkeys_need_update(subkeys);
}
return true;
}
/**
* Check whether the in-memory version of the values of a
* registry key needs update from disk.
*/
bool reg_values_need_update(struct registry_key_handle *key,
struct regval_ctr *values)
{
if (key->ops && key->ops->values_need_update)
{
return key->ops->values_need_update(values);
}
return true;
}
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