Mainly make collisions and coupling work - advtrains.git

path: root/advtrains_train_japan/textures

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author	orwell96 <orwell@bleipb.de>	2018-05-17 21:37:01 +0200
committer	orwell96 <orwell@bleipb.de>	2018-06-14 17:39:42 +0200
commit	24b0639c5f057ccb0fccc3c65be923bee1b571db (patch)
tree	be7ece8c6c70701dc02ee68cf86998f310efd2ec /advtrains_train_japan/textures
parent	5dca1553333b8267de72ebf8788afbb928251ebf (diff)
download	advtrains-24b0639c5f057ccb0fccc3c65be923bee1b571db.tar.gz advtrains-24b0639c5f057ccb0fccc3c65be923bee1b571db.tar.bz2 advtrains-24b0639c5f057ccb0fccc3c65be923bee1b571db.zip

Mainly make collisions and coupling work

Missing: ATC stuff, yaw problems

Diffstat (limited to 'advtrains_train_japan/textures')

0 files changed, 0 insertions, 0 deletions

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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.
*/

#include "cpp_api/s_security.h"

#include "filesys.h"
#include "porting.h"
#include "server.h"
#include "client/client.h"
#include "settings.h"

#include <cerrno>
#include <string>
#include <iostream>


#define SECURE_API(lib, name) \
	lua_pushcfunction(L, sl_##lib##_##name); \
	lua_setfield(L, -2, #name);


static inline void copy_safe(lua_State *L, const char *list[], unsigned len, int from=-2, int to=-1)
{
	if (from < 0) from = lua_gettop(L) + from + 1;
	if (to   < 0) to   = lua_gettop(L) + to   + 1;
	for (unsigned i = 0; i < (len / sizeof(list[0])); i++) {
		lua_getfield(L, from, list[i]);
		lua_setfield(L, to,   list[i]);
	}
}

static void shallow_copy_table(lua_State *L, int from=-2, int to=-1)
{
	if (from < 0) from = lua_gettop(L) + from + 1;
	if (to   < 0) to   = lua_gettop(L) + to   + 1;
	lua_pushnil(L);
	while (lua_next(L, from) != 0) {
		assert(lua_type(L, -1) != LUA_TTABLE);
		// duplicate key and value for lua_rawset
		lua_pushvalue(L, -2);
		lua_pushvalue(L, -2);
		lua_rawset(L, to);
		lua_pop(L, 1);
	}
}

// Pushes the original version of a library function on the stack, from the old version
static inline void push_original(lua_State *L, const char *lib, const char *func)
{
	lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_GLOBALS_BACKUP);
	lua_getfield(L, -1, lib);
	lua_remove(L, -2);  // Remove globals_backup
	lua_getfield(L, -1, func);
	lua_remove(L, -2);  // Remove lib
}


void ScriptApiSecurity::initializeSecurity()
{
	static const char *whitelist[] = {
		"assert",
		"core",
		"collectgarbage",
		"DIR_DELIM",
		"error",
		"getfenv",
		"getmetatable",
		"ipairs",
		"next",
		"pairs",
		"pcall",
		"print",
		"rawequal",
		"rawget",
		"rawset",
		"select",
		"setfenv",
		"setmetatable",
		"tonumber",
		"tostring",
		"type",
		"unpack",
		"_VERSION",
		"xpcall",
	};
	static const char *whitelist_tables[] = {
		// These libraries are completely safe BUT we need to duplicate their table
		// to ensure the sandbox can't affect the insecure env
		"coroutine",
		"string",
		"table",
		"math",
	};
	static const char *io_whitelist[] = {
		"close",
		"flush",
		"read",
		"type",
		"write",
	};
	static const char *os_whitelist[] = {
		"clock",
		"date",
		"difftime",
		"getenv",
		"setlocale",
		"time",
		"tmpname",
	};
	static const char *debug_whitelist[] = {
		"gethook",
		"traceback",
		"getinfo",
		"getmetatable",
		"setupvalue",
		"setmetatable",
		"upvalueid",
		"sethook",
		"debug",
		"setlocal",
	};
	static const char *package_whitelist[] = {
		"config",
		"cpath",
		"path",
		"searchpath",
	};
#if USE_LUAJIT
	static const char *jit_whitelist[] = {
		"arch",
		"flush",
		"off",
		"on",
		"opt",
		"os",
		"status",
		"version",
		"version_num",
	};
#endif
	m_secure = true;

	lua_State *L = getStack();

	// Backup globals to the registry
	lua_getglobal(L, "_G");
	lua_rawseti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_GLOBALS_BACKUP);

	// Replace the global environment with an empty one
	int thread = getThread(L);
	createEmptyEnv(L);
	setLuaEnv(L, thread);

	// Get old globals
	lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_GLOBALS_BACKUP);
	int old_globals = lua_gettop(L);


	// Copy safe base functions
	lua_getglobal(L, "_G");
	copy_safe(L, whitelist, sizeof(whitelist));

	// And replace unsafe ones
	SECURE_API(g, dofile);
	SECURE_API(g, load);
	SECURE_API(g, loadfile);
	SECURE_API(g, loadstring);
	SECURE_API(g, require);
	lua_pop(L, 1);


	// Copy safe libraries
	for (const char *libname : whitelist_tables) {
		lua_getfield(L, old_globals, libname);
		lua_newtable(L);
		shallow_copy_table(L);

		lua_setglobal(L, libname);
		lua_pop(L, 1);
	}


	// Copy safe IO functions
	lua_getfield(L, old_globals, "io");
	lua_newtable(L);
	copy_safe(L, io_whitelist, sizeof(io_whitelist));

	// And replace unsafe ones
	SECURE_API(io, open);
	SECURE_API(io, input);
	SECURE_API(io, output);
	SECURE_API(io, lines);

	lua_setglobal(L, "io");
	lua_pop(L, 1);  // Pop old IO


	// Copy safe OS functions
	lua_getfield(L, old_globals, "os");
	lua_newtable(L);
	copy_safe(L, os_whitelist, sizeof(os_whitelist));

	// And replace unsafe ones
	SECURE_API(os, remove);
	SECURE_API(os, rename);

	lua_setglobal(L, "os");
	lua_pop(L, 1);  // Pop old OS


	// Copy safe debug functions
	lua_getfield(L, old_globals, "debug");
	lua_newtable(L);
	copy_safe(L, debug_whitelist, sizeof(debug_whitelist));
	lua_setglobal(L, "debug");
	lua_pop(L, 1);  // Pop old debug


	// Copy safe package fields
	lua_getfield(L, old_globals, "package");
	lua_newtable(L);
	copy_safe(L, package_whitelist, sizeof(package_whitelist));
	lua_setglobal(L, "package");
	lua_pop(L, 1);  // Pop old package

#if USE_LUAJIT
	// Copy safe jit functions, if they exist
	lua_getfield(L, -1, "jit");
	if (!lua_isnil(L, -1)) {
		lua_newtable(L);
		copy_safe(L, jit_whitelist, sizeof(jit_whitelist));
		lua_setglobal(L, "jit");
	}
	lua_pop(L, 1);  // Pop old jit
#endif

	lua_pop(L, 1); // Pop globals_backup


	/*
	 * In addition to copying the tables in whitelist_tables, we also need to
	 * replace the string metatable. Otherwise old_globals.string would
	 * be accessible via getmetatable("").__index from inside the sandbox.
	 */
	lua_pushliteral(L, "");
	lua_newtable(L);
	lua_getglobal(L, "string");
	lua_setfield(L, -2, "__index");
	lua_setmetatable(L, -2);
	lua_pop(L, 1); // Pop empty string
}

void ScriptApiSecurity::initializeSecurityClient()
{
	static const char *whitelist[] = {
		"assert",
		"core",
		"collectgarbage",
		"DIR_DELIM",
		"error",
		"getfenv",
		"ipairs",
		"next",
		"pairs",
		"pcall",
		"print",
		"rawequal",
		"rawget",
		"rawset",
		"select",
		"setfenv",
		// getmetatable can be used to escape the sandbox
		"setmetatable",
		"tonumber",
		"tostring",
		"type",
		"unpack",
		"_VERSION",
		"xpcall",
		// Completely safe libraries
		"coroutine",
		"string",
		"table",
		"math",
	};
	static const char *os_whitelist[] = {
		"clock",
		"date",
		"difftime",
		"time"
	};
	static const char *debug_whitelist[] = {
		"getinfo",
		"traceback"
	};

#if USE_LUAJIT
	static const char *jit_whitelist[] = {
		"arch",
		"flush",
		"off",
		"on",
		"opt",
		"os",
		"status",
		"version",
		"version_num",
	};
#endif

	m_secure = true;

	lua_State *L = getStack();
	int thread = getThread(L);

	// create an empty environment
	createEmptyEnv(L);

	// Copy safe base functions
	lua_getglobal(L, "_G");
	lua_getfield(L, -2, "_G");
	copy_safe(L, whitelist, sizeof(whitelist));

	// And replace unsafe ones
	SECURE_API(g, dofile);
	SECURE_API(g, load);
	SECURE_API(g, loadfile);
	SECURE_API(g, loadstring);
	SECURE_API(g, require);
	lua_pop(L, 2);



	// Copy safe OS functions
	lua_getglobal(L, "os");
	lua_newtable(L);
	copy_safe(L, os_whitelist, sizeof(os_whitelist));
	lua_setfield(L, -3, "os");
	lua_pop(L, 1);  // Pop old OS


	// Copy safe debug functions
	lua_getglobal(L, "debug");
	lua_newtable(L);
	copy_safe(L, debug_whitelist, sizeof(debug_whitelist));
	lua_setfield(L, -3, "debug");
	lua_pop(L, 1);  // Pop old debug

#if USE_LUAJIT
	// Copy safe jit functions, if they exist
	lua_getglobal(L, "jit");
	lua_newtable(L);
	copy_safe(L, jit_whitelist, sizeof(jit_whitelist));
	lua_setfield(L, -3, "jit");
	lua_pop(L, 1);  // Pop old jit
#endif

	// Set the environment to the one we created earlier
	setLuaEnv(L, thread);
}

int ScriptApiSecurity::getThread(lua_State *L)
{
#if LUA_VERSION_NUM <= 501
	int is_main = lua_pushthread(L);  // Push the main thread
	FATAL_ERROR_IF(!is_main, "Security: ScriptApi's Lua state "
		"isn't the main Lua thread!");
	return lua_gettop(L);
#endif
	return 0;
}

void ScriptApiSecurity::createEmptyEnv(lua_State *L)
{
	lua_newtable(L);  // Create new environment
	lua_pushvalue(L, -1);
	lua_setfield(L, -2, "_G");  // Create the _G loop
}

void ScriptApiSecurity::setLuaEnv(lua_State *L, int thread)
{
#if LUA_VERSION_NUM >= 502  // Lua >= 5.2
	// Set the global environment
	lua_rawseti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);
#else  // Lua <= 5.1
	// Set the environment of the main thread
	FATAL_ERROR_IF(!lua_setfenv(L, thread), "Security: Unable to set "
		"environment of the main Lua thread!");
	lua_pop(L, 1);  // Pop thread
#endif
}

bool ScriptApiSecurity::isSecure(lua_State *L)
{
	lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_GLOBALS_BACKUP);
	bool secure = !lua_isnil(L, -1);
	lua_pop(L, 1);
	return secure;
}

bool ScriptApiSecurity::safeLoadString(lua_State *L, const std::string &code, const char *chunk_name)
{
	if (code.size() > 0 && code[0] == LUA_SIGNATURE[0]) {
		lua_pushliteral(L, "Bytecode prohibited when mod security is enabled.");
		return false;
	}
	if (luaL_loadbuffer(L, code.data(), code.size(), chunk_name))
		return false;
	return true;
}

bool ScriptApiSecurity::safeLoadFile(lua_State *L, const char *path, const char *display_name)
{
	FILE *fp;
	char *chunk_name;
	if (!display_name)
		display_name = path;
	if (!path) {
		fp = stdin;
		chunk_name = const_cast<char *>("=stdin");
	} else {
		fp = fopen(path, "rb");
		if (!fp) {
			lua_pushfstring(L, "%s: %s", path, strerror(errno));
			return false;
		}
		size_t len = strlen(display_name) + 2;
		chunk_name = new char[len];
		snprintf(chunk_name, len, "@%s", display_name);
	}

	size_t start = 0;
	int c = std::getc(fp);
	if (c == '#') {
		// Skip the first line
		while ((c = std::getc(fp)) != EOF && c != '\n') {}
		if (c == '\n')
			std::getc(fp);
		start = std::ftell(fp);
	}

	// Read the file
	int ret = std::fseek(fp, 0, SEEK_END);
	if (ret) {
		lua_pushfstring(L, "%s: %s", path, strerror(errno));
		if (path) {
			std::fclose(fp);
			delete [] chunk_name;
		}
		return false;
	}

	size_t size = std::ftell(fp) - start;
	std::string code(size, '\0');
	ret = std::fseek(fp, start, SEEK_SET);
	if (ret) {
		lua_pushfstring(L, "%s: %s", path, strerror(errno));
		if (path) {
			std::fclose(fp);
			delete [] chunk_name;
		}
		return false;
	}

	size_t num_read = std::fread(&code[0], 1, size, fp);
	if (path)
		std::fclose(fp);
	if (num_read != size) {
		lua_pushliteral(L, "Error reading file to load.");
		if (path)
			delete [] chunk_name;
		return false;
	}

	bool result = safeLoadString(L, code, chunk_name);
	if (path)
		delete [] chunk_name;
	return result;
}


bool ScriptApiSecurity::checkPath(lua_State *L, const char *path,
		bool write_required, bool *write_allowed)
{
	if (write_allowed)
		*write_allowed = false;

	std::string str;  // Transient


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