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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include <cstdio>
#include <cerrno>
#ifndef _MSC_VER // this header file does not exist for the microsoft compiler
#include <unistd.h>
#endif
#include <string>
#include <array>
#include "LuaIO.h"
#if !defined UNITSYNC && !defined DEDICATED && !defined BUILDING_AI
#include "LuaHandle.h"
#endif // !defined UNITSYNC && !defined DEDICATED && !defined BUILDING_AI
#include "LuaInclude.h"
#include "System/FileSystem/DataDirsAccess.h"
#include "System/FileSystem/FileSystem.h"
#include "System/StringUtil.h"
/******************************************************************************/
/******************************************************************************/
static bool IsSafePath(const std::string& path)
{
// keep searches within the Spring directory
if ((path[0] == '/') || (path[0] == '\\') ||
((path.size() >= 2) && (path[1] == ':'))) {
return false;
}
if ((path.find("..") != std::string::npos) ||
(path.find("springsettings.cfg") != std::string::npos) || //don't allow to change config file
(path.find(".springrc") != std::string::npos) ||
(path.find("springrc") != std::string::npos)
) {
return false;
}
return true;
}
/******************************************************************************/
/******************************************************************************/
bool LuaIO::IsSimplePath(const std::string& path)
{
// keep searches within the Spring directory
if ((path[0] == '/') || (path[0] == '\\') || ((path.size() >= 2) && (path[1] == ':')))
return false;
return (path.find("..") == std::string::npos);
}
bool LuaIO::SafeExecPath(const std::string& path)
{
return false; // don't allow execution of external programs, yet
}
bool LuaIO::SafeReadPath(const std::string& path)
{
return dataDirsAccess.InReadDir(path);
}
bool LuaIO::SafeWritePath(const std::string& path)
{
const std::array<std::string, 5> exeFiles = {"exe", "dll", "so", "bat", "com"};
const std::string ext = FileSystem::GetExtension(path);
if (std::find(std::begin(exeFiles), std::end(exeFiles), ext) != exeFiles.end())
return false;
return dataDirsAccess.InWriteDir(path);
}
/******************************************************************************/
/******************************************************************************/
FILE* LuaIO::fopen(lua_State* L, const char* path, const char* mode)
{
// check the mode string
const std::string modeStr = StringToLower(mode);
if (modeStr.find_first_not_of("rwabt+") != std::string::npos) {
errno = EINVAL;
return nullptr;
}
if (!IsSafePath(path)) {
errno = EPERM; //EACCESS?
return nullptr;
}
return ::fopen(path, mode);
}
FILE* LuaIO::popen(lua_State* L, const char* command, const char* type)
{
// check the type string
const std::string typeStr = StringToLower(type);
if (typeStr.find_first_not_of("rw") != std::string::npos) {
errno = EINVAL;
return nullptr;
}
errno = EINVAL;
return nullptr;
}
int LuaIO::pclose(lua_State* L, FILE* stream)
{
errno = ECHILD;
return -1;
}
int LuaIO::system(lua_State* L, const char* command)
{
luaL_error(L, "the system() call is not available");
return -1; //
}
int LuaIO::remove(lua_State* L, const char* pathname)
{
if (!SafeWritePath(pathname)
|| !IsSafePath(pathname)) {
errno = EPERM; //EACCESS?
return -1;
}
return ::remove(pathname);
}
int LuaIO::rename(lua_State* L, const char* oldpath, const char* newpath)
{
if (!SafeWritePath(oldpath) || !SafeWritePath(newpath)
|| !IsSafePath(oldpath) || !IsSafePath(newpath)) {
errno = EPERM; //EACCESS?
return -1;
}
return ::rename(oldpath, newpath);
}
/******************************************************************************/
/******************************************************************************/
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