/*
* 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.EncTicketPart;
import org.apache.directory.server.kerberos.shared.messages.components.EncTicketPartModifier;
import org.apache.directory.server.kerberos.shared.messages.value.TransitedEncoding;
import org.apache.directory.server.kerberos.shared.messages.value.flags.TicketFlags;
import org.apache.directory.server.kerberos.shared.messages.value.types.TransitedEncodingType;
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.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: 591019 $, $Date: 2007-11-01 15:16:34 +0100 (Jeu, 01 nov 2007) $
*/
public class EncTicketPartDecoder implements Decoder, DecoderFactory
{
public Decoder getDecoder()
{
return new EncTicketPartDecoder();
}
public Encodable decode( byte[] encodedTicket ) throws IOException
{
ASN1InputStream ais = new ASN1InputStream( encodedTicket );
DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
DERSequence sequence = ( DERSequence ) app.getObject();
return decodeEncTicketPartSequence( sequence );
}
/*
-- Encrypted part of ticket
EncTicketPart ::= [APPLICATION 3] SEQUENCE {
flags[0] TicketFlags,
key[1] EncryptionKey,
crealm[2] Realm,
cname[3] PrincipalName,
transited[4] TransitedEncoding,
authtime[5] KerberosTime,
starttime[6] KerberosTime OPTIONAL,
endtime[7] KerberosTime,
renew-till[8] KerberosTime OPTIONAL,
caddr[9] HostAddresses OPTIONAL,
authorization-data[10] AuthorizationData OPTIONAL
}*/
private EncTicketPart decodeEncTicketPartSequence( DERSequence sequence )
{
EncTicketPartModifier modifier = new EncTicketPartModifier();
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:
DERBitString tag0 = ( DERBitString ) derObject;
modifier.setFlags( new TicketFlags( tag0.getOctets() ) );
break;
case 1:
DERSequence tag1 = ( DERSequence ) derObject;
modifier.setSessionKey( EncryptionKeyDecoder.decode( tag1 ) );
break;
case 2:
DERGeneralString tag2 = ( DERGeneralString ) derObject;
modifier.setClientRealm( tag2.getString() );
break;
case 3:
DERSequence tag3 = ( DERSequence ) derObject;
modifier.setClientName( PrincipalNameDecoder.decode( tag3 ) );
break;
case 4:
DERSequence tag4 = ( DERSequence ) derObject;
modifier.setTransitedEncoding( decodeTransitedEncoding( tag4 ) );
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:
DERSequence tag9 = ( DERSequence ) derObject;
modifier.setClientAddresses( HostAddressDecoder.decodeSequence( tag9 ) );
break;
case 10:
DERSequence tag10 = ( DERSequence ) derObject;
modifier.setAuthorizationData( AuthorizationDataDecoder.decodeSequence( tag10 ) );
break;
}
}
return modifier.getEncTicketPart();
}
/*
* TransitedEncoding ::= SEQUENCE {
* tr-type[0] INTEGER, -- must be
* registered contents[1] OCTET STRING
* }
*/
protected TransitedEncoding decodeTransitedEncoding( DERSequence sequence )
{
TransitedEncodingType type = TransitedEncodingType.NULL;
byte[] contents = null;
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;
type = TransitedEncodingType.getTypeByOrdinal( tag0.intValue() );
break;
case 1:
DEROctetString tag1 = ( DEROctetString ) derObject;
contents = tag1.getOctets();
break;
}
}
return new TransitedEncoding( type, contents );
}
}