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package org.apache.velocity.util.introspection;
/*
* 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.
*/
import org.apache.velocity.runtime.RuntimeConstants;
import java.util.Iterator;
/**
* Use a custom introspector that prevents classloader related method
* calls. Use this introspector for situations in which template
* writers are numerous or untrusted. Specifically, this introspector
* prevents creation of arbitrary objects or reflection on objects.
*
* <p>To use this introspector, set the following property:
* <pre>
* introspector.uberspect.class = org.apache.velocity.util.introspection.SecureUberspector
* </pre>
*
* @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a>
* @version $Id$
* @since 1.5
*/
public class SecureUberspector extends UberspectImpl
{
/**
* init - generates the Introspector. As the setup code
* makes sure that the log gets set before this is called,
* we can initialize the Introspector using the log object.
*/
@Override
public void init()
{
String [] badPackages = rsvc.getConfiguration()
.getStringArray(RuntimeConstants.INTROSPECTOR_RESTRICT_PACKAGES);
String [] badClasses = rsvc.getConfiguration()
.getStringArray(RuntimeConstants.INTROSPECTOR_RESTRICT_CLASSES);
introspector = new SecureIntrospectorImpl(badClasses, badPackages, log);
}
/**
* Get an iterator from the given object. Since the superclass method
* this secure version checks for execute permission.
*
* @param obj object to iterate over
* @param i line, column, template info
* @return Iterator for object
*/
@Override
public Iterator getIterator(Object obj, Info i)
{
if (obj != null)
{
SecureIntrospectorControl sic = (SecureIntrospectorControl)introspector;
if (sic.checkObjectExecutePermission(obj.getClass(), null))
{
return super.getIterator(obj, i);
}
else
{
log.warn("Cannot retrieve iterator from {} due to security restrictions.", obj.getClass().getName());
}
}
return null;
}
}
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