/*
* Forge Mod Loader
* Copyright (c) 2012-2013 cpw.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Lesser Public License v2.1
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*
* Contributors:
* cpw - implementation
*/
package net.minecraftforge.fml.common.asm;
import java.io.File;
import java.io.IOException;
import java.net.URLDecoder;
import java.security.CodeSource;
import java.security.cert.Certificate;
import java.util.Map;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import org.apache.logging.log4j.Level;
import net.minecraft.launchwrapper.LaunchClassLoader;
import net.minecraftforge.fml.common.CertificateHelper;
import net.minecraftforge.fml.common.FMLCommonHandler;
import net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper;
import net.minecraftforge.fml.common.patcher.ClassPatchManager;
import net.minecraftforge.fml.relauncher.FMLLaunchHandler;
import net.minecraftforge.fml.relauncher.FMLRelaunchLog;
import net.minecraftforge.fml.relauncher.IFMLCallHook;
import net.minecraftforge.fml.relauncher.Side;
import com.google.common.base.Charsets;
import com.google.common.io.ByteStreams;
public class FMLSanityChecker implements IFMLCallHook
{
private static final String FMLFINGERPRINT = "51:0A:FB:4C:AF:A4:A0:F2:F5:CF:C5:0E:B4:CC:3C:30:24:4A:E3:8E".toLowerCase().replace(":", "");
private static final String FORGEFINGERPRINT = "E3:C3:D5:0C:7C:98:6D:F7:4C:64:5C:0A:C5:46:39:74:1C:90:A5:57".toLowerCase().replace(":", "");
private static final String MCFINGERPRINT = "CD:99:95:96:56:F7:53:DC:28:D8:63:B4:67:69:F7:F8:FB:AE:FC:FC".toLowerCase().replace(":", "");
private LaunchClassLoader cl;
private boolean liveEnv;
public static File fmlLocation;
@Override
public Void call() throws Exception
{
CodeSource codeSource = getClass().getProtectionDomain().getCodeSource();
boolean goodFML = false;
boolean fmlIsJar = false;
if (codeSource.getLocation().getProtocol().equals("jar"))
{
fmlIsJar = true;
Certificate[] certificates = codeSource.getCertificates();
if (certificates!=null)
{
for (Certificate cert : certificates)
{
String fingerprint = CertificateHelper.getFingerprint(cert);
if (fingerprint.equals(FMLFINGERPRINT))
{
FMLRelaunchLog.info("Found valid fingerprint for FML. Certificate fingerprint %s", fingerprint);
goodFML = true;
}
else if (fingerprint.equals(FORGEFINGERPRINT))
{
FMLRelaunchLog.info("Found valid fingerprint for Minecraft Forge. Certificate fingerprint %s", fingerprint);
goodFML = true;
}
else
{
FMLRelaunchLog.severe("Found invalid fingerprint for FML: %s", fingerprint);
}
}
}
}
else
{
goodFML = true;
}
// Server is not signed, so assume it's good - a deobf env is dev time so it's good too
boolean goodMC = FMLLaunchHandler.side() == Side.SERVER || !liveEnv;
int certCount = 0;
try
{
Class<?> cbr = Class.forName("net.minecraft.client.ClientBrandRetriever",false, cl);
codeSource = cbr.getProtectionDomain().getCodeSource();
}
catch (Exception e)
{
// Probably a development environment, or the server (the server is not signed)
goodMC = true;
}
JarFile mcJarFile = null;
if (fmlIsJar && !goodMC && codeSource.getLocation().getProtocol().equals("jar"))
{
try
{
String mcPath = codeSource.getLocation().getPath().substring(5);
mcPath = mcPath.substring(0, mcPath.lastIndexOf('!'));
mcPath = URLDecoder.decode(mcPath, Charsets.UTF_8.name());
mcJarFile = new JarFile(mcPath,true);
mcJarFile.getManifest();
JarEntry cbrEntry = mcJarFile.getJarEntry("net/minecraft/client/ClientBrandRetriever.class");
ByteStreams.toByteArray(mcJarFile.getInputStream(cbrEntry));
Certificate[] certificates = cbrEntry.getCertificates();
certCount = certificates != null ? certificates.length : 0;
if (certificates!=null)
{
for (Certificate cert : certificates)
{
String fingerprint = CertificateHelper.getFingerprint(cert);
if (fingerprint.equals(MCFINGERPRINT))
{
FMLRelaunchLog.info("Found valid fingerprint for Minecraft. Certificate fingerprint %s", fingerprint);
goodMC = true;
}
}
}
}
catch (Throwable e)
{
FMLRelaunchLog.log(Level.ERROR, e, "A critical error occurred trying to read the minecraft jar file");
}
finally
{
if (mcJarFile != null)
{
try
{
mcJarFile.close();
}
catch (IOException ioe)
{
// Noise
}
}
}
}
else
{
goodMC = true;
}
if (!goodMC)
{
FMLRelaunchLog.severe("The minecraft jar %s appears to be corrupt! There has been CRITICAL TAMPERING WITH MINECRAFT, it is highly unlikely minecraft will work! STOP NOW, get a clean copy and try again!",codeSource.getLocation().getFile());
if (!Boolean.parseBoolean(System.getProperty("fml.ignoreInvalidMinecraftCertificates","false")))
{
FMLRelaunchLog.severe("For your safety, FML will not launch minecraft. You will need to fetch a clean version of the minecraft jar file");
FMLRelaunchLog.severe("Technical information: The class net.minecraft.client.ClientBrandRetriever should have been associated with the minecraft jar file, " +
"and should have returned us a valid, intact minecraft jar location. This did not work. Either you have modified the minecraft jar file (if so " +
"run the forge installer again), or you are using a base editing jar that is changing this class (and likely others too). If you REALLY " +
"want to run minecraft in this configuration, add the flag -Dfml.ignoreInvalidMinecraftCertificates=true to the 'JVM settings' in your launcher profile.");
FMLCommonHandler.instance().exitJava(1, false);
}
else
{
FMLRelaunchLog.severe("FML has been ordered to ignore the invalid or missing minecraft certificate. This is very likely to cause a problem!");
FMLRelaunchLog.severe("Technical information: ClientBrandRetriever was at %s, there were %d certificates for it", codeSource.getLocation(), certCount);
}
}
if (!goodFML)
{
FMLRelaunchLog.severe("FML appears to be missing any signature data. This is not a good thing");
}
return null;
}
@Override
public void injectData(Map<String, Object> data)
{
liveEnv = (Boolean)data.get("runtimeDeobfuscationEnabled");
cl = (LaunchClassLoader) data.get("classLoader");
File mcDir = (File)data.get("mcLocation");
fmlLocation = (File)data.get("coremodLocation");
ClassPatchManager.INSTANCE.setup(FMLLaunchHandler.side());
FMLDeobfuscatingRemapper.INSTANCE.setup(mcDir, cl, (String) data.get("deobfuscationFileName"));
}
}