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/*
* Unix SMB/CIFS implementation.
* Virtual Windows Registry Layer
* Copyright (C) Gerald Carter 2002-2005
* Copyright (C) Michael Adam 2006
*
* 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"
#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 SEC_DESC* construct_registry_sd( TALLOC_CTX *ctx )
{
SEC_ACE ace[3];
SEC_ACCESS mask;
size_t i = 0;
SEC_DESC *sd;
SEC_ACL *acl;
size_t sd_size;
/* basic access for Everyone */
init_sec_access(&mask, REG_KEY_READ );
init_sec_ace(&ace[i++], &global_sid_World, SEC_ACE_TYPE_ACCESS_ALLOWED, mask, 0);
/* Full Access 'BUILTIN\Administrators' */
init_sec_access(&mask, REG_KEY_ALL );
init_sec_ace(&ace[i++], &global_sid_Builtin_Administrators, SEC_ACE_TYPE_ACCESS_ALLOWED, mask, 0);
/* Full Access 'NT Authority\System' */
init_sec_access(&mask, REG_KEY_ALL );
init_sec_ace(&ace[i++], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED, mask, 0);
/* create the security descriptor */
if ( !(acl = make_sec_acl(ctx, NT4_ACL_REVISION, i, ace)) )
return NULL;
if ( !(sd = make_sec_desc(ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE, NULL, NULL, NULL, acl, &sd_size)) )
return NULL;
return sd;
}
/***********************************************************************
High level wrapper function for storing registry subkeys
***********************************************************************/
bool store_reg_keys( REGISTRY_KEY *key, REGSUBKEY_CTR *subkeys )
{
if ( key->hook && key->hook->ops && key->hook->ops->store_subkeys )
return key->hook->ops->store_subkeys( key->name, subkeys );
return False;
}
/***********************************************************************
High level wrapper function for storing registry values
***********************************************************************/
bool store_reg_values( REGISTRY_KEY *key, REGVAL_CTR *val )
{
if ( check_dynamic_reg_values( key ) )
return False;
if ( key->hook && key->hook->ops && key->hook->ops->store_values )
return key->hook->ops->store_values( key->name, val );
return False;
}
/***********************************************************************
High level wrapper function for enumerating registry subkeys
Initialize the TALLOC_CTX if necessary
***********************************************************************/
int fetch_reg_keys( REGISTRY_KEY *key, REGSUBKEY_CTR *subkey_ctr )
{
int result = -1;
if ( key->hook && key->hook->ops && key->hook->ops->fetch_subkeys )
result = key->hook->ops->fetch_subkeys( key->name, subkey_ctr );
return result;
}
/***********************************************************************
High level wrapper function for enumerating registry values
***********************************************************************/
int fetch_reg_values( REGISTRY_KEY *key, REGVAL_CTR *val )
{
int result = -1;
if ( key->hook && key->hook->ops && key->hook->ops->fetch_values )
result = key->hook->ops->fetch_values( key->name, val );
/* if the backend lookup returned no data, try the dynamic overlay */
if ( result == 0 ) {
result = fetch_dynamic_reg_values( key, val );
return ( result != -1 ) ? result : 0;
}
return result;
}
/***********************************************************************
High level access check for passing the required access mask to the
underlying registry backend
***********************************************************************/
bool regkey_access_check( REGISTRY_KEY *key, uint32 requested, uint32 *granted,
const struct nt_user_token *token )
{
SEC_DESC *sec_desc;
NTSTATUS status;
WERROR err;
TALLOC_CTX *mem_ctx;
/* use the default security check if the backend has not defined its
* own */
if (key->hook && key->hook->ops && key->hook->ops->reg_access_check) {
return key->hook->ops->reg_access_check( key->name, requested,
granted, token );
}
/*
* The secdesc routines can't yet cope with a NULL talloc ctx sanely.
*/
if (!(mem_ctx = talloc_init("regkey_access_check"))) {
return False;
}
err = regkey_get_secdesc(mem_ctx, key, &sec_desc);
if (!W_ERROR_IS_OK(err)) {
TALLOC_FREE(mem_ctx);
return False;
}
se_map_generic( &requested, ®_generic_map );
if (!se_access_check(sec_desc, token, requested, granted, &status)) {
TALLOC_FREE(mem_ctx);
return False;
}
TALLOC_FREE(mem_ctx);
return NT_STATUS_IS_OK(status);
}
WERROR regkey_get_secdesc(TALLOC_CTX *mem_ctx, REGISTRY_KEY *key,
struct security_descriptor **psecdesc)
{
struct security_descriptor *secdesc;
if (key->hook && key->hook->ops && key->hook->ops->get_secdesc) {
WERROR err;
err = key->hook->ops->get_secdesc(mem_ctx, key->name,
psecdesc);
if (W_ERROR_IS_OK(err)) {
return WERR_OK;
}
}
if (!(secdesc = construct_registry_sd(mem_ctx))) {
return WERR_NOMEM;
}
*psecdesc = secdesc;
return WERR_OK;
}
WERROR regkey_set_secdesc(REGISTRY_KEY *key,
struct security_descriptor *psecdesc)
{
if (key->hook && key->hook->ops && key->hook->ops->set_secdesc) {
return key->hook->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(REGISTRY_KEY *key, REGSUBKEY_CTR *subkeys)
{
if (key->hook && key->hook->ops && key->hook->ops->subkeys_need_update)
{
return key->hook->ops->subkeys_need_update(subkeys);
}
return false;
}
/**
* Check whether the in-memory version of the values of a
* registry key needs update from disk.
*/
bool reg_values_need_update(REGISTRY_KEY *key, REGVAL_CTR *values)
{
if (key->hook && key->hook->ops && key->hook->ops->values_need_update)
{
return key->hook->ops->values_need_update(values);
}
return false;
}
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