001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020 package org.apache.directory.server.kerberos.shared.io.decoder; 021 022 023 import java.io.IOException; 024 import java.util.Enumeration; 025 026 import org.apache.directory.server.kerberos.shared.KerberosMessageType; 027 import org.apache.directory.server.kerberos.shared.messages.ApplicationRequest; 028 import org.apache.directory.server.kerberos.shared.messages.value.ApOptions; 029 import org.apache.directory.shared.asn1.der.ASN1InputStream; 030 import org.apache.directory.shared.asn1.der.DERApplicationSpecific; 031 import org.apache.directory.shared.asn1.der.DERBitString; 032 import org.apache.directory.shared.asn1.der.DEREncodable; 033 import org.apache.directory.shared.asn1.der.DERInteger; 034 import org.apache.directory.shared.asn1.der.DERSequence; 035 import org.apache.directory.shared.asn1.der.DERTaggedObject; 036 037 038 /** 039 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 040 * @version $Rev: 589780 $, $Date: 2007-10-29 19:14:59 +0100 (Mon, 29 Oct 2007) $ 041 */ 042 public class ApplicationRequestDecoder 043 { 044 /** 045 * Decodes a byte array into an {@link ApplicationRequest}. 046 * 047 * @param encodedAuthHeader 048 * @return The {@link ApplicationRequest}. 049 * @throws IOException 050 */ 051 public ApplicationRequest decode( byte[] encodedAuthHeader ) throws IOException 052 { 053 ASN1InputStream ais = new ASN1InputStream( encodedAuthHeader ); 054 055 DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject(); 056 057 DERSequence apreq = ( DERSequence ) app.getObject(); 058 059 return decodeApplicationRequestSequence( apreq ); 060 } 061 062 063 /* 064 AP-REQ ::= [APPLICATION 14] SEQUENCE { 065 pvno[0] INTEGER, 066 msg-type[1] INTEGER, 067 068 ap-options[2] APOptions, 069 ticket[3] Ticket, 070 authenticator[4] EncryptedData 071 } 072 */ 073 private ApplicationRequest decodeApplicationRequestSequence( DERSequence sequence ) throws IOException 074 { 075 ApplicationRequest authHeader = new ApplicationRequest(); 076 077 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); ) 078 { 079 DERTaggedObject object = ( ( DERTaggedObject ) e.nextElement() ); 080 int tag = object.getTagNo(); 081 DEREncodable derObject = object.getObject(); 082 083 switch ( tag ) 084 { 085 case 0: 086 DERInteger tag0 = ( DERInteger ) derObject; 087 authHeader.setProtocolVersionNumber( tag0.intValue() ); 088 break; 089 090 case 1: 091 DERInteger tag1 = ( DERInteger ) derObject; 092 authHeader.setMessageType( KerberosMessageType.getTypeByOrdinal( tag1.intValue() ) ); 093 break; 094 095 case 2: 096 DERBitString apOptions = ( DERBitString ) derObject; 097 authHeader.setApOptions( new ApOptions( apOptions.getOctets() ) ); 098 break; 099 case 3: 100 DERApplicationSpecific tag3 = ( DERApplicationSpecific ) derObject; 101 authHeader.setTicket( TicketDecoder.decode( tag3 ) ); 102 break; 103 104 case 4: 105 DERSequence tag4 = ( DERSequence ) derObject; 106 authHeader.setEncPart( EncryptedDataDecoder.decode( tag4 ) ); 107 break; 108 } 109 } 110 111 return authHeader; 112 } 113 }