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.Encodable;
027 import org.apache.directory.server.kerberos.shared.messages.components.EncKdcRepPart;
028 import org.apache.directory.server.kerberos.shared.messages.value.KerberosPrincipalModifier;
029 import org.apache.directory.server.kerberos.shared.messages.value.flags.TicketFlags;
030 import org.apache.directory.shared.asn1.der.ASN1InputStream;
031 import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
032 import org.apache.directory.shared.asn1.der.DERBitString;
033 import org.apache.directory.shared.asn1.der.DEREncodable;
034 import org.apache.directory.shared.asn1.der.DERGeneralString;
035 import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
036 import org.apache.directory.shared.asn1.der.DERInteger;
037 import org.apache.directory.shared.asn1.der.DERSequence;
038 import org.apache.directory.shared.asn1.der.DERTaggedObject;
039
040
041 /**
042 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
043 * @version $Rev: 502338 $, $Date: 2007-02-01 11:59:43 -0800 (Thu, 01 Feb 2007) $
044 */
045 public class EncKdcRepPartDecoder implements Decoder, DecoderFactory
046 {
047 public Decoder getDecoder()
048 {
049 return new EncKdcRepPartDecoder();
050 }
051
052
053 public Encodable decode( byte[] encoded ) throws IOException
054 {
055 ASN1InputStream ais = new ASN1InputStream( encoded );
056
057 DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
058
059 DERSequence sequence = ( DERSequence ) app.getObject();
060
061 return decodeEncKdcRepPartSequence( sequence );
062 }
063
064
065 /**
066 * EncKDCRepPart ::= SEQUENCE {
067 * key[0] EncryptionKey,
068 * last-req[1] LastReq,
069 * nonce[2] INTEGER,
070 * key-expiration[3] KerberosTime OPTIONAL,
071 * flags[4] TicketFlags,
072 * authtime[5] KerberosTime,
073 * starttime[6] KerberosTime OPTIONAL,
074 * endtime[7] KerberosTime,
075 * renew-till[8] KerberosTime OPTIONAL,
076 * srealm[9] Realm,
077 * sname[10] PrincipalName,
078 * caddr[11] HostAddresses OPTIONAL
079 * }
080 */
081 private EncKdcRepPart decodeEncKdcRepPartSequence( DERSequence sequence )
082 {
083 EncKdcRepPart modifier = new EncKdcRepPart();
084 KerberosPrincipalModifier principalModifier = new KerberosPrincipalModifier();
085
086 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
087 {
088 DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
089 int tag = object.getTagNo();
090 DEREncodable derObject = object.getObject();
091
092 switch ( tag )
093 {
094 case 0:
095 DERSequence tag0 = ( DERSequence ) derObject;
096 modifier.setKey( EncryptionKeyDecoder.decode( tag0 ) );
097 break;
098 case 1:
099 DERSequence tag1 = ( DERSequence ) derObject;
100 modifier.setLastRequest( LastRequestDecoder.decodeSequence( tag1 ) );
101 break;
102 case 2:
103 DERInteger tag2 = ( DERInteger ) derObject;
104 modifier.setNonce( new Integer( tag2.intValue() ) );
105 break;
106 case 3:
107 DERGeneralizedTime tag3 = ( DERGeneralizedTime ) derObject;
108 modifier.setKeyExpiration( KerberosTimeDecoder.decode( tag3 ) );
109 break;
110 case 4:
111 DERBitString tag4 = ( DERBitString ) derObject;
112 modifier.setFlags( new TicketFlags( tag4.getOctets() ) );
113 break;
114 case 5:
115 DERGeneralizedTime tag5 = ( DERGeneralizedTime ) derObject;
116 modifier.setAuthTime( KerberosTimeDecoder.decode( tag5 ) );
117 break;
118 case 6:
119 DERGeneralizedTime tag6 = ( DERGeneralizedTime ) derObject;
120 modifier.setStartTime( KerberosTimeDecoder.decode( tag6 ) );
121 break;
122 case 7:
123 DERGeneralizedTime tag7 = ( DERGeneralizedTime ) derObject;
124 modifier.setEndTime( KerberosTimeDecoder.decode( tag7 ) );
125 break;
126 case 8:
127 DERGeneralizedTime tag8 = ( DERGeneralizedTime ) derObject;
128 modifier.setRenewTill( KerberosTimeDecoder.decode( tag8 ) );
129 break;
130 case 9:
131 DERGeneralString tag9 = ( DERGeneralString ) derObject;
132 principalModifier.setRealm( tag9.getString() );
133 break;
134 case 10:
135 DERSequence tag10 = ( DERSequence ) derObject;
136 principalModifier.setPrincipalName( PrincipalNameDecoder.decode( tag10 ) );
137 break;
138 case 11:
139 DERSequence tag11 = ( DERSequence ) derObject;
140 modifier.setClientAddresses( HostAddressDecoder.decodeSequence( tag11 ) );
141 break;
142 }
143 }
144
145 modifier.setServerPrincipal( principalModifier.getKerberosPrincipal() );
146
147 return modifier;
148 }
149 }