| /* |
| * 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.logging.log4j.server; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InvalidObjectException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectStreamClass; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.List; |
| |
| /** |
| * Extended ObjectInputStream that only allows certain classes to be deserialized. |
| * |
| * @since 2.8.2 |
| */ |
| public class FilteredObjectInputStream extends ObjectInputStream { |
| |
| private static final List<String> REQUIRED_JAVA_CLASSES = Arrays.asList( |
| // for StandardLevel |
| "java.lang.Enum", |
| // for location information |
| "java.lang.StackTraceElement", |
| // for Message delegate |
| "java.rmi.MarshalledObject", |
| "[B" |
| ); |
| |
| private final Collection<String> allowedClasses; |
| |
| public FilteredObjectInputStream(final InputStream in, final Collection<String> allowedClasses) throws IOException { |
| super(in); |
| this.allowedClasses = allowedClasses; |
| } |
| |
| @Override |
| protected Class<?> resolveClass(final ObjectStreamClass desc) throws IOException, ClassNotFoundException { |
| String name = desc.getName(); |
| if (!(isAllowedByDefault(name) || allowedClasses.contains(name))) { |
| throw new InvalidObjectException("Class is not allowed for deserialization: " + name); |
| } |
| return super.resolveClass(desc); |
| } |
| |
| private static boolean isAllowedByDefault(final String name) { |
| return name.startsWith("org.apache.logging.log4j.") || |
| name.startsWith("[Lorg.apache.logging.log4j.") || |
| REQUIRED_JAVA_CLASSES.contains(name); |
| } |
| |
| } |