1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.directory.server.ldap.handlers.sasl;
21
22
23 import javax.security.sasl.SaslServer;
24
25 import org.apache.directory.server.ldap.LdapSession;
26 import org.apache.mina.core.filterchain.IoFilterChain;
27 import org.apache.mina.core.session.IoSession;
28 import org.slf4j.Logger;
29 import org.slf4j.LoggerFactory;
30
31
32 /**
33 *
34 * An abstract class for all the MechanismHandlers, implementing some common methods
35 *
36 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
37 */
38 public abstract class AbstractMechanismHandler implements MechanismHandler
39 {
40 /** A logger for this class **/
41 private static final Logger LOG = LoggerFactory.getLogger( AbstractMechanismHandler.class );
42
43
44 /**
45 * Inject a SaslFilter into the Filter chain, to deal with modified
46 * PDU sent when some mechanisms have been negotiated (DIGEST-MD5, GSSAPI,
47 * for instance)
48 *
49 * @param ldapSession the LdapSession instance
50 */
51 protected void insertSaslFilter( LdapSession ldapSession )
52 {
53 LOG.debug( "Inserting SaslFilter to engage negotiated security layer." );
54 IoSession ioSession = ldapSession.getIoSession();
55
56 // get the Io chain
57 IoFilterChain chain = ioSession.getFilterChain();
58
59 if ( !chain.contains( SaslConstants.SASL_FILTER ) )
60 {
61 SaslServer saslServer = ( SaslServer ) ldapSession.getSaslProperty( SaslConstants.SASL_SERVER );
62 chain.addBefore( "codec", SaslConstants.SASL_FILTER, new SaslFilter( saslServer ) );
63 }
64
65 /*
66 * We disable the SASL security layer once, to write the outbound SUCCESS
67 * message without SASL security layer processing.
68 */
69 ioSession.setAttribute( SaslFilter.DISABLE_SECURITY_LAYER_ONCE, Boolean.TRUE );
70 }
71 }