/*
* 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.decoder;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Enumeration;
import javax.security.auth.kerberos.KerberosPrincipal;
import org.apache.directory.server.kerberos.shared.KerberosMessageType;
import org.apache.directory.server.kerberos.shared.messages.KdcReply;
import org.apache.directory.server.kerberos.shared.messages.components.Ticket;
import org.apache.directory.server.kerberos.shared.messages.value.EncryptedData;
import org.apache.directory.server.kerberos.shared.messages.value.KerberosPrincipalModifier;
import org.apache.directory.server.kerberos.shared.messages.value.PaData;
import org.apache.directory.shared.asn1.der.ASN1InputStream;
import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
import org.apache.directory.shared.asn1.der.DEREncodable;
import org.apache.directory.shared.asn1.der.DERGeneralString;
import org.apache.directory.shared.asn1.der.DERInteger;
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: 540371 $, $Date: 2007-05-21 17:00:43 -0700 (Mon, 21 May 2007) $
*/
public class KdcReplyDecoder
{
/**
* Decodes a {@link ByteBuffer} into a {@link KdcReply}.
*
* AS-REP ::= [APPLICATION 11] KDC-REP
* TGS-REP ::= [APPLICATION 13] KDC-REP
*
* @param in
* @return The {@link KdcReply}.
* @throws IOException
*/
public KdcReply decode( ByteBuffer in ) throws IOException
{
ASN1InputStream ais = new ASN1InputStream( in );
DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
DERSequence kdcreq = ( DERSequence ) app.getObject();
return decodeKdcReplySequence( kdcreq );
}
/*
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 KdcReply decodeKdcReplySequence( DERSequence sequence ) throws IOException
{
KerberosMessageType msgType = null;
PaData[] paData = null;
Ticket ticket = null;
EncryptedData encPart = null;
KerberosPrincipalModifier modifier = new KerberosPrincipalModifier();
for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
{
DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
int tag = object.getTagNo();
DEREncodable derObject = object.getObject();
switch ( tag )
{
case 0:
// DERInteger tag0 = ( DERInteger ) derObject;
// int pvno = tag0.intValue();
break;
case 1:
DERInteger tag1 = ( DERInteger ) derObject;
msgType = KerberosMessageType.getTypeByOrdinal( tag1.intValue() );
break;
case 2:
DERSequence tag2 = ( DERSequence ) derObject;
paData = PreAuthenticationDataDecoder.decodeSequence( tag2 );
break;
case 3:
DERGeneralString tag3 = ( DERGeneralString ) derObject;
modifier.setRealm( tag3.getString() );
break;
case 4:
DERSequence tag4 = ( DERSequence ) derObject;
modifier.setPrincipalName( PrincipalNameDecoder.decode( tag4 ) );
break;
case 5:
DERApplicationSpecific tag5 = ( DERApplicationSpecific ) derObject;
ticket = TicketDecoder.decode( tag5 );
break;
case 6:
DERSequence tag6 = ( DERSequence ) derObject;
encPart = ( EncryptedDataDecoder.decode( tag6 ) );
break;
}
}
KerberosPrincipal clientPrincipal = modifier.getKerberosPrincipal();
return new KdcReply( paData, clientPrincipal, ticket, encPart, msgType );
}
}