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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.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
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.resource.Resource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An extension of {@link AllowedResourceAliasChecker} which only allows aliased resources if they are symlinks.
*/
public class SymlinkAllowedResourceAliasChecker extends AllowedResourceAliasChecker
{
private static final Logger LOG = LoggerFactory.getLogger(SymlinkAllowedResourceAliasChecker.class);
/**
* @param contextHandler the context handler to use.
*/
public SymlinkAllowedResourceAliasChecker(ContextHandler contextHandler)
{
super(contextHandler, false);
}
@Override
public boolean check(String uri, Resource resource)
{
try
{
// Check the resource is allowed to be accessed.
if (!super.check(uri, resource))
return false;
// Approve if path is a symbolic link.
Path resourcePath = resource.getFile().toPath();
if (Files.isSymbolicLink(resourcePath))
return true;
// Approve if path has symlink in under its resource base.
if (super.hasSymbolicLink(getBasePath(), resourcePath))
return true;
}
catch (IOException e)
{
LOG.trace("Failed to check alias", e);
return false;
}
return false;
}
}