/*
* 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.util.Enumeration;
import org.apache.directory.server.kerberos.shared.messages.Encodable;
import org.apache.directory.server.kerberos.shared.messages.components.EncKdcRepPart;
import org.apache.directory.server.kerberos.shared.messages.value.KerberosPrincipalModifier;
import org.apache.directory.server.kerberos.shared.messages.value.flags.TicketFlags;
import org.apache.directory.shared.asn1.der.ASN1InputStream;
import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
import org.apache.directory.shared.asn1.der.DERBitString;
import org.apache.directory.shared.asn1.der.DEREncodable;
import org.apache.directory.shared.asn1.der.DERGeneralString;
import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
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: 502338 $, $Date: 2007-02-01 11:59:43 -0800 (Thu, 01 Feb 2007) $
*/
public class EncKdcRepPartDecoder implements Decoder, DecoderFactory
{
public Decoder getDecoder()
{
return new EncKdcRepPartDecoder();
}
public Encodable decode( byte[] encoded ) throws IOException
{
ASN1InputStream ais = new ASN1InputStream( encoded );
DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
DERSequence sequence = ( DERSequence ) app.getObject();
return decodeEncKdcRepPartSequence( sequence );
}
/**
* EncKDCRepPart ::= SEQUENCE {
* key[0] EncryptionKey,
* last-req[1] LastReq,
* nonce[2] INTEGER,
* key-expiration[3] KerberosTime OPTIONAL,
* flags[4] TicketFlags,
* authtime[5] KerberosTime,
* starttime[6] KerberosTime OPTIONAL,
* endtime[7] KerberosTime,
* renew-till[8] KerberosTime OPTIONAL,
* srealm[9] Realm,
* sname[10] PrincipalName,
* caddr[11] HostAddresses OPTIONAL
* }
*/
private EncKdcRepPart decodeEncKdcRepPartSequence( DERSequence sequence )
{
EncKdcRepPart modifier = new EncKdcRepPart();
KerberosPrincipalModifier principalModifier = 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:
DERSequence tag0 = ( DERSequence ) derObject;
modifier.setKey( EncryptionKeyDecoder.decode( tag0 ) );
break;
case 1:
DERSequence tag1 = ( DERSequence ) derObject;
modifier.setLastRequest( LastRequestDecoder.decodeSequence( tag1 ) );
break;
case 2:
DERInteger tag2 = ( DERInteger ) derObject;
modifier.setNonce( new Integer( tag2.intValue() ) );
break;
case 3:
DERGeneralizedTime tag3 = ( DERGeneralizedTime ) derObject;
modifier.setKeyExpiration( KerberosTimeDecoder.decode( tag3 ) );
break;
case 4:
DERBitString tag4 = ( DERBitString ) derObject;
modifier.setFlags( new TicketFlags( tag4.getOctets() ) );
break;
case 5:
DERGeneralizedTime tag5 = ( DERGeneralizedTime ) derObject;
modifier.setAuthTime( KerberosTimeDecoder.decode( tag5 ) );
break;
case 6:
DERGeneralizedTime tag6 = ( DERGeneralizedTime ) derObject;
modifier.setStartTime( KerberosTimeDecoder.decode( tag6 ) );
break;
case 7:
DERGeneralizedTime tag7 = ( DERGeneralizedTime ) derObject;
modifier.setEndTime( KerberosTimeDecoder.decode( tag7 ) );
break;
case 8:
DERGeneralizedTime tag8 = ( DERGeneralizedTime ) derObject;
modifier.setRenewTill( KerberosTimeDecoder.decode( tag8 ) );
break;
case 9:
DERGeneralString tag9 = ( DERGeneralString ) derObject;
principalModifier.setRealm( tag9.getString() );
break;
case 10:
DERSequence tag10 = ( DERSequence ) derObject;
principalModifier.setPrincipalName( PrincipalNameDecoder.decode( tag10 ) );
break;
case 11:
DERSequence tag11 = ( DERSequence ) derObject;
modifier.setClientAddresses( HostAddressDecoder.decodeSequence( tag11 ) );
break;
}
}
modifier.setServerPrincipal( principalModifier.getKerberosPrincipal() );
return modifier;
}
}