/**
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This 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 software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
**/
package org.richfaces.util;
import java.io.IOException;
import java.io.InputStream;
import java.io.InvalidClassException;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.richfaces.log.Logger;
import org.richfaces.log.RichfacesLogger;
/**
* When deserializing objects, first check that the class being deserialized is in the allowed whitelist.
*
* @author <a href="http://community.jboss.org/people/bleathem">Brian Leathem</a>
*/
public class LookAheadObjectInputStream extends ObjectInputStream {
private static final Logger LOGGER = RichfacesLogger.APPLICATION.getLogger();
private static final Map<String, Class<?>> PRIMITIVE_TYPES = new HashMap<String, Class<?>>(9, 1.0F);
private static Set<Class> whitelistBaseClasses = new HashSet<Class>();
private static Set<String> whitelistClassNameCache = Collections.newSetFromMap(new ConcurrentHashMap<String, Boolean>());
static {
PRIMITIVE_TYPES.put("bool", Boolean.TYPE);
PRIMITIVE_TYPES.put("byte", Byte.TYPE);
PRIMITIVE_TYPES.put("char", Character.TYPE);
PRIMITIVE_TYPES.put("short", Short.TYPE);
PRIMITIVE_TYPES.put("int", Integer.TYPE);
PRIMITIVE_TYPES.put("long", Long.TYPE);
PRIMITIVE_TYPES.put("float", Float.TYPE);
PRIMITIVE_TYPES.put("double", Double.TYPE);
PRIMITIVE_TYPES.put("void", Void.TYPE);
whitelistClassNameCache.add(new Object[0].getClass().getName());
whitelistClassNameCache.add(new String[0].getClass().getName());
whitelistClassNameCache.add(new Boolean[0].getClass().getName());
whitelistClassNameCache.add(new Byte[0].getClass().getName());
whitelistClassNameCache.add(new Character[0].getClass().getName());
whitelistClassNameCache.add(new Short[0].getClass().getName());
whitelistClassNameCache.add(new Integer[0].getClass().getName());
whitelistClassNameCache.add(new Long[0].getClass().getName());
whitelistClassNameCache.add(new Float[0].getClass().getName());
whitelistClassNameCache.add(new Double[0].getClass().getName());
whitelistClassNameCache.add(new Void[0].getClass().getName());
whitelistBaseClasses.add(String.class);
whitelistBaseClasses.add(Boolean.class);
whitelistBaseClasses.add(Byte.class);
whitelistBaseClasses.add(Character.class);
whitelistBaseClasses.add(Number.class);
whitelistBaseClasses.add(Collection.class);
loadWhitelist();
}
public LookAheadObjectInputStream(InputStream in) throws IOException {
super(in);
}
/**
* Only deserialize primitive or whitelisted classes
*/
@Override
protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
Class<?> primitiveType = PRIMITIVE_TYPES.get(desc.getName());
if (primitiveType != null) {
return primitiveType;
}
if (!isClassValid(desc.getName())) {
throw new InvalidClassException("Unauthorized deserialization attempt", desc.getName());
}
return super.resolveClass(desc);
}
/**
* Determine if the given requestedClassName is allowed by the whitelist
*/
boolean isClassValid(String requestedClassName) {
if (whitelistClassNameCache.contains(requestedClassName)) {
return true;
}
try {
Class<?> requestedClass = Class.forName(requestedClassName);
for (Class baseClass : whitelistBaseClasses ) {
if (baseClass.isAssignableFrom(requestedClass)) {
whitelistClassNameCache.add(requestedClassName);
return true;
}
}
} catch (ClassNotFoundException e) {
return false;
}
return false;
}
/**
* Load the whitelist from the properties file
*/
static void loadWhitelist() {
Properties whitelistProperties = new Properties();
InputStream stream = null;
try {
stream = LookAheadObjectInputStream.class.getResourceAsStream("/org/richfaces/resource/resource-serialization.properties");
whitelistProperties.load(stream);
} catch (IOException e) {
throw new RuntimeException("Error loading the resource-serialization.properties file", e);
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
throw new RuntimeException("Error closing the resource-serialization.properties file", e);
}
}
}
for (String baseClassName : whitelistProperties.getProperty("whitelist").split(",")) {
try {
Class<?> baseClass = Class.forName(baseClassName);
whitelistBaseClasses.add(baseClass);
} catch (ClassNotFoundException e) {
if (LOGGER.isInfoEnabled()) {
LOGGER.debug(e);
}
}
}
}
}