/* * 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")); } }