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SymlinkAllowedResourceAliasChecker.java
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SymlinkAllowedResourceAliasChecker.java
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//
// ========================================================================
// Copyright (c) 1995-2021 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.server;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.resource.Resource;
/**
* An extension of {@link AllowedResourceAliasChecker} which only allows resources if they are symlinks.
*/
public class SymlinkAllowedResourceAliasChecker extends AllowedResourceAliasChecker
{
private static final Logger LOG = Log.getLogger(SymlinkAllowedResourceAliasChecker.class);
private final ContextHandler _contextHandler;
/**
* @param contextHandler the context handler to use.
*/
public SymlinkAllowedResourceAliasChecker(ContextHandler contextHandler)
{
super(contextHandler, false);
_contextHandler = contextHandler;
}
@Override
public boolean check(String uri, Resource resource)
{
try
{
// Check the resource is allowed to be accessed.
if (!super.check(uri, resource))
return false;
// Only approve resource if it is accessed by a symbolic link.
Path resourcePath = resource.getFile().toPath();
if (Files.isSymbolicLink(resourcePath))
return true;
// TODO: If base resource contains symlink then this will always return true.
// But we don't want to deny all paths if the resource base is symbolically linked.
if (super.hasSymbolicLink(resourcePath))
return true;
}
catch (IOException e)
{
LOG.ignore(e);
return false;
}
return false;
}
}