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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *  
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *  
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  package org.apache.directory.server.kerberos.shared.io.decoder;
21  
22  
23  import java.io.IOException;
24  import java.util.Enumeration;
25  
26  import org.apache.directory.server.kerberos.shared.messages.Encodable;
27  import org.apache.directory.server.kerberos.shared.messages.components.EncKdcRepPart;
28  import org.apache.directory.server.kerberos.shared.messages.value.KerberosPrincipalModifier;
29  import org.apache.directory.server.kerberos.shared.messages.value.flags.TicketFlags;
30  import org.apache.directory.shared.asn1.der.ASN1InputStream;
31  import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
32  import org.apache.directory.shared.asn1.der.DERBitString;
33  import org.apache.directory.shared.asn1.der.DEREncodable;
34  import org.apache.directory.shared.asn1.der.DERGeneralString;
35  import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
36  import org.apache.directory.shared.asn1.der.DERInteger;
37  import org.apache.directory.shared.asn1.der.DERSequence;
38  import org.apache.directory.shared.asn1.der.DERTaggedObject;
39  
40  
41  /**
42   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
43   * @version $Rev: 502338 $, $Date: 2007-02-01 11:59:43 -0800 (Thu, 01 Feb 2007) $
44   */
45  public class EncKdcRepPartDecoder implements Decoder, DecoderFactory
46  {
47      public Decoder getDecoder()
48      {
49          return new EncKdcRepPartDecoder();
50      }
51  
52  
53      public Encodable decode( byte[] encoded ) throws IOException
54      {
55          ASN1InputStream ais = new ASN1InputStream( encoded );
56  
57          DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
58  
59          DERSequence sequence = ( DERSequence ) app.getObject();
60  
61          return decodeEncKdcRepPartSequence( sequence );
62      }
63  
64  
65      /**
66       *    EncKDCRepPart ::=   SEQUENCE {
67       *                key[0]                       EncryptionKey,
68       *                last-req[1]                  LastReq,
69       *                nonce[2]                     INTEGER,
70       *                key-expiration[3]            KerberosTime OPTIONAL,
71       *                flags[4]                     TicketFlags,
72       *                authtime[5]                  KerberosTime,
73       *                starttime[6]                 KerberosTime OPTIONAL,
74       *                endtime[7]                   KerberosTime,
75       *                renew-till[8]                KerberosTime OPTIONAL,
76       *                srealm[9]                    Realm,
77       *                sname[10]                    PrincipalName,
78       *                caddr[11]                    HostAddresses OPTIONAL
79       * }
80       */
81      private EncKdcRepPart decodeEncKdcRepPartSequence( DERSequence sequence )
82      {
83          EncKdcRepPart modifier = new EncKdcRepPart();
84          KerberosPrincipalModifier principalModifier = new KerberosPrincipalModifier();
85  
86          for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
87          {
88              DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
89              int tag = object.getTagNo();
90              DEREncodable derObject = object.getObject();
91  
92              switch ( tag )
93              {
94                  case 0:
95                      DERSequence tag0 = ( DERSequence ) derObject;
96                      modifier.setKey( EncryptionKeyDecoder.decode( tag0 ) );
97                      break;
98                  case 1:
99                      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 }