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Enable safe Lua os.* functions #316

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merged 4 commits into from Sep 6, 2018
Merged

Enable safe Lua os.* functions #316

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8b01d7b
Enable safe Os functions
Dezash Aug 8, 2018
548a1a3
Enable safe Os functions
Dezash Aug 8, 2018
6322826
Move Os function removals to InitSecurity
Dezash Aug 8, 2018
944c01b
Set disabled Os functions to CLuaUtilDefs::DisabledFunction
Dezash Aug 16, 2018
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17 changes: 17 additions & 0 deletions Server/mods/deathmatch/logic/lua/CLuaMain.cpp
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Expand Up @@ -172,6 +172,23 @@ void CLuaMain::InitVM(void)
luaopen_table(m_luaVM);
luaopen_debug(m_luaVM);
luaopen_utf8(m_luaVM);
luaopen_os(m_luaVM);

// Disable dangerous Lua Os library functions
lua_getglobal(m_luaVM, "os");
lua_pushnil(m_luaVM);
lua_setfield(m_luaVM, -2, "execute");
lua_pushnil(m_luaVM);
lua_setfield(m_luaVM, -2, "rename");
lua_pushnil(m_luaVM);
lua_setfield(m_luaVM, -2, "remove");
lua_pushnil(m_luaVM);
lua_setfield(m_luaVM, -2, "exit");
lua_pushnil(m_luaVM);
lua_setfield(m_luaVM, -2, "getenv");
lua_pushnil(m_luaVM);
lua_setfield(m_luaVM, -2, "tmpname");
lua_pop(m_luaVM, 1);

// Initialize security restrictions. Very important to prevent lua trojans and viruses!
InitSecurity();
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