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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.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);
}
@Override
public boolean check(String pathInContext, Resource resource)
{
// The existence check resolves the symlinks.
if (!resource.exists())
return false;
Path path = getPath(resource);
if (path == null)
return false;
String[] segments = pathInContext.split("/");
Path fromBase = _base;
try
{
for (String segment : segments)
{
fromBase = fromBase.resolve(segment);
if (!Files.exists(fromBase))
return false;
if (Files.isSymbolicLink(fromBase))
return true;
if (!isAllowed(fromBase))
return false;
}
}
catch (Throwable t)
{
LOG.warn("Failed to check alias", t);
return false;
}
return true;
}
}