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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef S_SECURITY_H
#define S_SECURITY_H
#include "cpp_api/s_base.h"
#define CHECK_SECURE_PATH_INTERNAL(L, path, write_required, ptr) \
if (!ScriptApiSecurity::checkPath(L, path, write_required, ptr)) { \
throw LuaError(std::string("Mod security: Blocked attempted ") + \
(write_required ? "write to " : "read from ") + path); \
}
#define CHECK_SECURE_PATH(L, path, write_required) \
if (ScriptApiSecurity::isSecure(L)) { \
CHECK_SECURE_PATH_INTERNAL(L, path, write_required, NULL); \
}
#define CHECK_SECURE_PATH_POSSIBLE_WRITE(L, path, ptr) \
if (ScriptApiSecurity::isSecure(L)) { \
CHECK_SECURE_PATH_INTERNAL(L, path, false, ptr); \
}
class ScriptApiSecurity : virtual public ScriptApiBase
{
public:
int getThread(lua_State *L);
// creates an empty Lua environment
void createEmptyEnv(lua_State *L);
// sets the enviroment to the table thats on top of the stack
void setLuaEnv(lua_State *L, int thread);
// Sets up security on the ScriptApi's Lua state
void initializeSecurity();
void initializeSecurityClient();
// Checks if the Lua state has been secured
static bool isSecure(lua_State *L);
// Loads a file as Lua code safely (doesn't allow bytecode).
static bool safeLoadFile(lua_State *L, const char *path, const char *display_name = NULL);
// Checks if mods are allowed to read (and optionally write) to the path
static bool checkPath(lua_State *L, const char *path, bool write_required,
bool *write_allowed=NULL);
private:
// Syntax: "sl_" <Library name or 'g' (global)> '_' <Function name>
// (sl stands for Secure Lua)
static int sl_g_dofile(lua_State *L);
static int sl_g_load(lua_State *L);
static int sl_g_loadfile(lua_State *L);
static int sl_g_loadstring(lua_State *L);
static int sl_g_require(lua_State *L);
static int sl_io_open(lua_State *L);
static int sl_io_input(lua_State *L);
static int sl_io_output(lua_State *L);
static int sl_io_lines(lua_State *L);
static int sl_os_rename(lua_State *L);
static int sl_os_remove(lua_State *L);
};
#endif
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