/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.util;
import java.io.InputStream;
import java.io.IOException;
import java.io.InvalidClassException;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
import java.lang.reflect.Proxy;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Pattern;
import org.apache.juli.logging.Log;
import org.apache.tomcat.util.res.StringManager;
/**
* Custom subclass of <code>ObjectInputStream</code> that loads from the
* class loader for this web application. This allows classes defined only
* with the web application to be found correctly.
*
* @author Craig R. McClanahan
* @author Bip Thelin
*
*/
public final class CustomObjectInputStream extends ObjectInputStream {
private static final StringManager sm = StringManager.getManager(
CustomObjectInputStream.class.getPackage().getName());
private static final WeakHashMap<ClassLoader, Map<String,Boolean>> reportedClassCache =
new WeakHashMap<ClassLoader, Map<String,Boolean>>();
/**
* The class loader we will use to resolve classes.
*/
private ClassLoader classLoader = null;
private final Map<String,Boolean> reportedClasses;
private final Log log;
private final Pattern allowedClassNamePattern;
private final String allowedClassNameFilter;
private final boolean warnOnFailure;
/**
* Construct a new instance of CustomObjectInputStream without any filtering
* of deserialized classes.
*
* @param stream The input stream we will read from
* @param classLoader The class loader used to instantiate objects
*
* @exception IOException if an input/output error occurs
*/
public CustomObjectInputStream(InputStream stream, ClassLoader classLoader) throws IOException {
this(stream, classLoader, null, null, false);
}
/**
* Construct a new instance of CustomObjectInputStream with filtering of
* deserialized classes.
*
* @param stream The input stream we will read from
* @param classLoader The class loader used to instantiate objects
* @param log The logger to use to report any issues. It may only be null if
* the filterMode does not require logging
* @param allowedClassNamePattern The regular expression to use to filter
* deserialized classes. The fully qualified
* class name must match this pattern for
* deserialization to be allowed if filtering
* is enabled.
* @param warnOnFailure Should any failures be logged?
*
* @exception IOException if an input/output error occurs
*/
public CustomObjectInputStream(InputStream stream, ClassLoader classLoader,
Log log, Pattern allowedClassNamePattern, boolean warnOnFailure)
throws IOException {
super(stream);
if (log == null && allowedClassNamePattern != null && warnOnFailure) {
throw new IllegalArgumentException(
sm.getString("customObjectInputStream.logRequired"));
}
this.classLoader = classLoader;
this.log = log;
this.allowedClassNamePattern = allowedClassNamePattern;
if (allowedClassNamePattern == null) {
this.allowedClassNameFilter = null;
} else {
this.allowedClassNameFilter = allowedClassNamePattern.toString();
}
this.warnOnFailure = warnOnFailure;
Map<String,Boolean> reportedClasses;
synchronized (reportedClassCache) {
reportedClasses = reportedClassCache.get(classLoader);
if (reportedClasses == null) {
reportedClasses = new ConcurrentHashMap<String,Boolean>();
reportedClassCache.put(classLoader, reportedClasses);
}
}
this.reportedClasses = reportedClasses;
}
/**
* Load the local class equivalent of the specified stream class
* description, by using the class loader assigned to this Context.
*
* @param classDesc Class description from the input stream
*
* @exception ClassNotFoundException if this class cannot be found
* @exception IOException if an input/output error occurs
*/
@Override
public Class<?> resolveClass(ObjectStreamClass classDesc)
throws ClassNotFoundException, IOException {
String name = classDesc.getName();
if (allowedClassNamePattern != null) {
boolean allowed = allowedClassNamePattern.matcher(name).matches();
if (!allowed) {
boolean doLog = warnOnFailure && reportedClasses.put(name, Boolean.FALSE) == null;
String msg = sm.getString("customObjectInputStream.nomatch", name, allowedClassNameFilter);
if (doLog) {
log.warn(msg);
} else if (log.isDebugEnabled()) {
log.debug(msg);
}
throw new InvalidClassException(msg);
}
}
try {
return Class.forName(name, false, classLoader);
} catch (ClassNotFoundException e) {
try {
// Try also the superclass because of primitive types
return super.resolveClass(classDesc);
} catch (ClassNotFoundException e2) {
// Rethrow original exception, as it can have more information
// about why the class was not found. BZ 48007
throw e;
}
}
}
/**
* Return a proxy class that implements the interfaces named in a proxy
* class descriptor. Do this using the class loader assigned to this
* Context.
*/
@Override
protected Class<?> resolveProxyClass(String[] interfaces)
throws IOException, ClassNotFoundException {
Class<?>[] cinterfaces = new Class[interfaces.length];
for (int i = 0; i < interfaces.length; i++) {
cinterfaces[i] = classLoader.loadClass(interfaces[i]);
}
try {
return Proxy.getProxyClass(classLoader, cinterfaces);
} catch (IllegalArgumentException e) {
throw new ClassNotFoundException(null, e);
}
}
}