/*
* 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.directory.server.kerberos.shared.io.encoder;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.apache.directory.server.kerberos.shared.messages.KdcReply;
import org.apache.directory.server.kerberos.shared.messages.value.PaData;
import org.apache.directory.shared.asn1.der.ASN1OutputStream;
import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
import org.apache.directory.shared.asn1.der.DERGeneralString;
import org.apache.directory.shared.asn1.der.DERInteger;
import org.apache.directory.shared.asn1.der.DEROctetString;
import org.apache.directory.shared.asn1.der.DERSequence;
import org.apache.directory.shared.asn1.der.DERTaggedObject;
/**
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
* @version $Rev: 587624 $, $Date: 2007-10-23 21:22:08 +0200 (Mar, 23 oct 2007) $
*/
public class KdcReplyEncoder
{
/**
* Encodes a {@link KdcReply} into a {@link ByteBuffer}.
*
* AS-REP ::= [APPLICATION 11] KDC-REP
* TGS-REP ::= [APPLICATION 13] KDC-REP
*
* @param app
* @param out
* @throws IOException
*/
public void encode( KdcReply app, ByteBuffer out ) throws IOException
{
ASN1OutputStream aos = new ASN1OutputStream( out );
DERSequence kdcrep = encodeKdcReplySequence( app );
aos.writeObject( DERApplicationSpecific.valueOf( app.getMessageType().getOrdinal(), kdcrep ) );
aos.close();
}
/*
KDC-REP ::= SEQUENCE {
pvno[0] INTEGER,
msg-type[1] INTEGER,
padata[2] SEQUENCE OF PA-DATA OPTIONAL,
crealm[3] Realm,
cname[4] PrincipalName,
ticket[5] Ticket,
enc-part[6] EncryptedData
}*/
private DERSequence encodeKdcReplySequence( KdcReply app )
{
DERSequence sequence = new DERSequence();
sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( app.getProtocolVersionNumber() ) ) );
sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( app.getMessageType().getOrdinal() ) ) );
if ( app.getPaData() != null )
{
sequence.add( new DERTaggedObject( 2, encodePreAuthData( app.getPaData() ) ) );
}
sequence.add( new DERTaggedObject( 3, DERGeneralString.valueOf( app.getClientRealm().toString() ) ) );
sequence.add( new DERTaggedObject( 4, PrincipalNameEncoder.encode( app.getClientPrincipal() ) ) );
sequence.add( new DERTaggedObject( 5, TicketEncoder.encode( app.getTicket() ) ) );
sequence.add( new DERTaggedObject( 6, EncryptedDataEncoder.encodeSequence( app.getEncPart() ) ) );
return sequence;
}
/*
PA-DATA ::= SEQUENCE {
padata-type[1] INTEGER,
padata-value[2] OCTET STRING,
-- might be encoded AP-REQ
}*/
private DERSequence encodePreAuthData( PaData[] preAuthData )
{
DERSequence preAuth = new DERSequence();
for ( int ii = 0; ii < preAuthData.length; ii++ )
{
DERSequence sequence = new DERSequence();
sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( preAuthData[ii].getPaDataType().getOrdinal() ) ) );
sequence.add( new DERTaggedObject( 2, new DEROctetString( preAuthData[ii].getPaDataValue() ) ) );
preAuth.add( sequence );
}
return preAuth;
}
}