/*
* 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 org.apache.directory.server.kerberos.shared.messages.ErrorMessage;
import org.apache.directory.server.kerberos.shared.messages.ErrorMessageModifier;
import org.apache.directory.server.kerberos.shared.messages.value.KerberosPrincipalModifier;
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.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 $Rev$, $Date$
*/
public class ErrorMessageDecoder
{
/**
* Decodes a {@link ByteBuffer} into an {@link ErrorMessage}.
*
* KRB-ERROR ::= [APPLICATION 30] SEQUENCE
*
* @param in
* @return The {@link ErrorMessage}.
* @throws IOException
*/
public ErrorMessage decode( ByteBuffer in ) throws IOException
{
ASN1InputStream ais = new ASN1InputStream( in );
DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
DERSequence errorMessage = ( DERSequence ) app.getObject();
return decodeErrorMessageSequence( errorMessage );
}
/*
KRB-ERROR ::= [APPLICATION 30] SEQUENCE {
pvno [0] INTEGER (5),
msg-type [1] INTEGER (30),
ctime [2] KerberosTime OPTIONAL,
cusec [3] Microseconds OPTIONAL,
stime [4] KerberosTime,
susec [5] Microseconds,
error-code [6] Int32,
crealm [7] Realm OPTIONAL,
cname [8] PrincipalName OPTIONAL,
realm [9] Realm -- service realm --,
sname [10] PrincipalName -- service name --,
e-text [11] KerberosString OPTIONAL,
e-data [12] OCTET STRING OPTIONAL
}
*/
private ErrorMessage decodeErrorMessageSequence( DERSequence sequence )
{
ErrorMessageModifier errorModifier = new ErrorMessageModifier();
KerberosPrincipalModifier clientModifier = new KerberosPrincipalModifier();
KerberosPrincipalModifier serverModifier = 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 = MessageType.getTypeByOrdinal( tag1.intValue() );
break;
case 2:
DERGeneralizedTime tag2 = ( DERGeneralizedTime ) derObject;
errorModifier.setClientTime( KerberosTimeDecoder.decode( tag2 ) );
break;
case 3:
DERInteger tag3 = ( DERInteger ) derObject;
errorModifier.setClientMicroSecond( tag3.intValue() );
break;
case 4:
DERGeneralizedTime tag4 = ( DERGeneralizedTime ) derObject;
errorModifier.setServerTime( KerberosTimeDecoder.decode( tag4 ) );
break;
case 5:
DERInteger tag5 = ( DERInteger ) derObject;
errorModifier.setServerMicroSecond( tag5.intValue() );
break;
case 6:
DERInteger tag6 = ( DERInteger ) derObject;
errorModifier.setErrorCode( tag6.intValue() );
break;
case 7:
DERGeneralString tag7 = ( DERGeneralString ) derObject;
clientModifier.setRealm( tag7.getString() );
break;
case 8:
DERSequence tag8 = ( DERSequence ) derObject;
clientModifier.setPrincipalName( PrincipalNameDecoder.decode( tag8 ) );
break;
case 9:
DERGeneralString tag9 = ( DERGeneralString ) derObject;
serverModifier.setRealm( tag9.getString() );
break;
case 10:
DERSequence tag10 = ( DERSequence ) derObject;
serverModifier.setPrincipalName( PrincipalNameDecoder.decode( tag10 ) );
break;
case 11:
DERGeneralString tag11 = ( DERGeneralString ) derObject;
errorModifier.setExplanatoryText( tag11.getString() );
break;
case 12:
DEROctetString tag12 = ( DEROctetString ) derObject;
errorModifier.setExplanatoryData( tag12.getOctets() );
break;
}
}
errorModifier.setClientPrincipal( clientModifier.getKerberosPrincipal() );
errorModifier.setServerPrincipal( serverModifier.getKerberosPrincipal() );
return errorModifier.getErrorMessage();
}
}