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/*
* 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.
*/
package org.apache.qpid.server.security.access.firewall;
import java.net.InetAddress;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
import org.apache.log4j.Logger;
public class HostnameFirewallRule implements FirewallRule
{
private static final Logger _logger = Logger.getLogger(HostnameFirewallRule.class);
private static final long DNS_TIMEOUT = 30000;
private static final ExecutorService DNS_LOOKUP = Executors.newCachedThreadPool();
private Pattern[] _hostnamePatterns;
private String[] _hostnames;
public HostnameFirewallRule(String... hostnames)
{
_hostnames = hostnames;
int i = 0;
_hostnamePatterns = new Pattern[hostnames.length];
for (String hostname : hostnames)
{
_hostnamePatterns[i++] = Pattern.compile(hostname);
}
if(_logger.isDebugEnabled())
{
_logger.debug("Created " + this);
}
}
@Override
public boolean matches(InetAddress remote)
{
String hostname = getHostname(remote);
if (hostname == null)
{
throw new AccessControlFirewallException("DNS lookup failed for address " + remote);
}
for (Pattern pattern : _hostnamePatterns)
{
boolean hostnameMatches = pattern.matcher(hostname).matches();
if (hostnameMatches)
{
if(_logger.isDebugEnabled())
{
_logger.debug("Hostname " + hostname + " matches rule " + pattern.toString());
}
return true;
}
}
if(_logger.isDebugEnabled())
{
_logger.debug("Hostname " + hostname + " matches no configured hostname patterns");
}
return false;
}
/**
* @param remote
* the InetAddress to look up
* @return the hostname, null if not found, takes longer than
* {@value #DNS_LOOKUP} to find or otherwise fails
*/
private String getHostname(final InetAddress remote) throws AccessControlFirewallException
{
FutureTask<String> lookup = new FutureTask<String>(new Callable<String>()
{
public String call()
{
return remote.getCanonicalHostName();
}
});
DNS_LOOKUP.execute(lookup);
try
{
return lookup.get(DNS_TIMEOUT, TimeUnit.MILLISECONDS);
}
catch (Exception e)
{
_logger.warn("Unable to look up hostname from address " + remote, e);
return null;
}
finally
{
lookup.cancel(true);
}
}
@Override
public int hashCode()
{
return new HashCodeBuilder().append(_hostnames).toHashCode();
}
@Override
public boolean equals(Object obj)
{
if (obj == null)
{
return false;
}
if (obj == this)
{
return true;
}
if (obj.getClass() != getClass())
{
return false;
}
HostnameFirewallRule rhs = (HostnameFirewallRule) obj;
return new EqualsBuilder().append(_hostnames, rhs._hostnames).isEquals();
}
@Override
public String toString()
{
return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE)
.append(_hostnames).toString();
}
}
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