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.shared.kerberos.codec.kdcReqBody.actions;
021
022
023import org.apache.directory.api.asn1.DecoderException;
024import org.apache.directory.api.asn1.ber.grammar.GrammarAction;
025import org.apache.directory.api.asn1.ber.tlv.BerValue;
026import org.apache.directory.api.asn1.ber.tlv.IntegerDecoder;
027import org.apache.directory.api.asn1.ber.tlv.IntegerDecoderException;
028import org.apache.directory.api.asn1.ber.tlv.TLV;
029import org.apache.directory.api.i18n.I18n;
030import org.apache.directory.api.util.Strings;
031import org.apache.directory.shared.kerberos.codec.kdcReqBody.KdcReqBodyContainer;
032import org.apache.directory.shared.kerberos.codec.types.EncryptionType;
033import org.apache.directory.shared.kerberos.components.KdcReqBody;
034import org.slf4j.Logger;
035import org.slf4j.LoggerFactory;
036
037
038/**
039 * The action used to add an EType
040 *
041 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
042 */
043public class AddEType extends GrammarAction<KdcReqBodyContainer>
044{
045    /** The logger */
046    private static final Logger LOG = LoggerFactory.getLogger( AddEType.class );
047
048    /** Speedup for logs */
049    private static final boolean IS_DEBUG = LOG.isDebugEnabled();
050
051
052    /**
053     * Instantiates a new AddEType action.
054     */
055    public AddEType()
056    {
057        super( "KDC-REQ-BODY AddEType" );
058    }
059
060
061    /**
062     * {@inheritDoc}
063     */
064    public void action( KdcReqBodyContainer kdcReqBodyContainer ) throws DecoderException
065    {
066        TLV tlv = kdcReqBodyContainer.getCurrentTLV();
067
068        // The Length can't be null
069        if ( tlv.getLength() == 0 )
070        {
071            LOG.error( I18n.err( I18n.ERR_01308_ZERO_LENGTH_TLV ) );
072
073            // This will generate a PROTOCOL_ERROR
074            throw new DecoderException( I18n.err( I18n.ERR_01309_EMPTY_TLV ) );
075        }
076
077        KdcReqBody kdcReqBody = kdcReqBodyContainer.getKdcReqBody();
078
079        BerValue value = tlv.getValue();
080
081        try
082        {
083            int etype = IntegerDecoder.parse( value );
084            EncryptionType encryptionType = EncryptionType.getTypeByValue( etype );
085
086            kdcReqBody.addEType( encryptionType );
087
088            if ( IS_DEBUG )
089            {
090                LOG.debug( "EncryptionType : {}", encryptionType );
091            }
092        }
093        catch ( IntegerDecoderException ide )
094        {
095            LOG.error( I18n.err( I18n.ERR_01310_INTEGER_DECODING_ERROR, Strings.dumpBytes( value.getData() ) ) );
096
097            // This will generate a PROTOCOL_ERROR
098            throw new DecoderException( ide.getMessage() );
099        }
100
101        kdcReqBodyContainer.setGrammarEndAllowed( true );
102    }
103}