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.messages.components.Ticket; 027 import org.apache.directory.shared.asn1.der.ASN1InputStream; 028 import org.apache.directory.shared.asn1.der.DERApplicationSpecific; 029 import org.apache.directory.shared.asn1.der.DEREncodable; 030 import org.apache.directory.shared.asn1.der.DERGeneralString; 031 import org.apache.directory.shared.asn1.der.DERInteger; 032 import org.apache.directory.shared.asn1.der.DERSequence; 033 import org.apache.directory.shared.asn1.der.DERTaggedObject; 034 035 036 /** 037 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 038 * @version $Rev: 589780 $, $Date: 2007-10-29 19:14:59 +0100 (Mon, 29 Oct 2007) $ 039 */ 040 public class TicketDecoder 041 { 042 /** 043 * Decodes a byte array into an {@link Ticket}. 044 * 045 * @param encodedTicket 046 * @return The {@link Ticket}. 047 * @throws IOException 048 */ 049 public static Ticket decode( byte[] encodedTicket ) throws IOException 050 { 051 ASN1InputStream ais = new ASN1InputStream( encodedTicket ); 052 053 DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject(); 054 055 return decode( app ); 056 } 057 058 059 /** 060 * Decodes a {@link DERSequence} into an array of {@link Ticket}s. 061 * 062 * @param sequence 063 * @return The array of {@link Ticket}s. 064 * @throws IOException 065 */ 066 public static Ticket[] decodeSequence( DERSequence sequence ) throws IOException 067 { 068 Ticket[] tickets = new Ticket[sequence.size()]; 069 070 int ii = 0; 071 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); ) 072 { 073 DERApplicationSpecific object = ( DERApplicationSpecific ) e.nextElement(); 074 tickets[ii] = decode( object ); 075 } 076 077 return tickets; 078 } 079 080 081 /** 082 * Ticket ::= [APPLICATION 1] SEQUENCE { 083 * tkt-vno[0] INTEGER, 084 * realm[1] Realm, 085 * sname[2] PrincipalName, 086 * enc-part[3] EncryptedData 087 * } 088 */ 089 protected static Ticket decode( DERApplicationSpecific app ) throws IOException 090 { 091 DERSequence sequence = ( DERSequence ) app.getObject(); 092 093 Ticket ticket = new Ticket(); 094 095 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); ) 096 { 097 DERTaggedObject object = ( DERTaggedObject ) e.nextElement(); 098 int tag = object.getTagNo(); 099 DEREncodable derObject = object.getObject(); 100 101 switch ( tag ) 102 { 103 case 0: 104 DERInteger tag0 = ( DERInteger ) derObject; 105 ticket.setTktVno( tag0.intValue() ); 106 break; 107 108 case 1: 109 DERGeneralString tag1 = ( DERGeneralString ) derObject; 110 ticket.setRealm( tag1.getString() ); 111 break; 112 113 case 2: 114 DERSequence tag2 = ( DERSequence ) derObject; 115 ticket.setSName( PrincipalNameDecoder.decode( tag2 ) ); 116 break; 117 118 case 3: 119 DERSequence tag3 = ( DERSequence ) derObject; 120 ticket.setEncPart( EncryptedDataDecoder.decode( tag3 ) ); 121 break; 122 } 123 } 124 125 return ticket; 126 } 127 }