001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *  http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019
020package org.apache.directory.server.ldap.handlers.extended;
021
022import org.apache.directory.api.ldap.extras.extended.startTls.StartTlsResponse;
023import org.apache.mina.core.filterchain.IoFilter;
024import org.apache.mina.core.filterchain.IoFilterAdapter;
025import org.apache.mina.core.filterchain.IoFilterChain;
026import org.apache.mina.core.session.IoSession;
027import org.apache.mina.core.write.WriteRequest;
028import org.apache.mina.filter.ssl.SslFilter;
029
030/**
031 * A filter used to deal with clear text exchanges when the START_TLS extended operation is received 
032 *
033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
034 */
035public class StartTlsFilter extends IoFilterAdapter 
036{
037    /**
038     * {@inheritDoc}
039     */
040    @Override
041    public void filterWrite( NextFilter nextFilter, IoSession session, WriteRequest writeRequest ) throws Exception 
042    {
043        if ( writeRequest.getOriginalMessage() instanceof StartTlsResponse )
044        {
045            // We need to bypass the SslFilter
046            IoFilterChain chain = session.getFilterChain();
047            
048            for ( IoFilterChain.Entry entry : chain.getAll() )
049            {
050                IoFilter filter = entry.getFilter();
051                
052                if ( filter instanceof SslFilter )
053                {
054                    entry.getNextFilter().filterWrite( session, writeRequest );
055                }
056            }
057        }
058        else
059        {
060            nextFilter.filterWrite( session, writeRequest );
061        }
062    }
063}