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//
// ========================================================================
// Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.handler;
import java.io.File;
import java.net.URI;
import java.nio.file.Files;
import java.nio.file.Path;
import org.eclipse.jetty.server.handler.ContextHandler.AliasCheck;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.resource.Resource;
/* ------------------------------------------------------------ */
/** Symbolic Link AliasChecker.
* <p>An instance of this class can be registered with {@link ContextHandler#addAliasCheck(AliasCheck)}
* to check resources that are aliased to other locations. The checker uses the
* Java {@link Files#readSymbolicLink(Path)} and {@link Path#toRealPath(java.nio.file.LinkOption...)}
* APIs to check if a file is aliased with symbolic links.</p>
*/
public class AllowSymLinkAliasChecker implements AliasCheck
{
private static final Logger LOG = Log.getLogger(AllowSymLinkAliasChecker.class);
@Override
public boolean check(String path, Resource resource)
{
try
{
File file =resource.getFile();
if (file==null)
return false;
// If the file exists
if (file.exists())
{
// we can use the real path method to check the symlinks resolve to the alias
URI real = file.toPath().toRealPath().toUri();
if (real.equals(resource.getAlias()))
{
if (LOG.isDebugEnabled())
LOG.debug("Allow symlink {} --> {}",resource,real);
return true;
}
}
else
{
// file does not exists, so we have to walk the path and links ourselves.
Path p = file.toPath().toAbsolutePath();
File d = p.getRoot().toFile();
for (Path e:p)
{
d=new File(d,e.toString());
while (d.exists() && Files.isSymbolicLink(d.toPath()))
{
Path link=Files.readSymbolicLink(d.toPath());
if (!link.isAbsolute())
link=link.resolve(d.toPath());
d=link.toFile().getAbsoluteFile().getCanonicalFile();
}
}
if (resource.getAlias().equals(d.toURI()))
{
if (LOG.isDebugEnabled())
LOG.debug("Allow symlink {} --> {}",resource,d);
return true;
}
}
}
catch(Exception e)
{
e.printStackTrace();
LOG.ignore(e);
}
return false;
}
}
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