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.Authenticator; 028 import org.apache.directory.server.kerberos.shared.messages.components.AuthenticatorModifier; 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.DEREncodable; 032 import org.apache.directory.shared.asn1.der.DERGeneralString; 033 import org.apache.directory.shared.asn1.der.DERGeneralizedTime; 034 import org.apache.directory.shared.asn1.der.DERInteger; 035 import org.apache.directory.shared.asn1.der.DERSequence; 036 import org.apache.directory.shared.asn1.der.DERTaggedObject; 037 038 039 /** 040 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 041 * @version $Rev: 502338 $, $Date: 2007-02-01 20:59:43 +0100 (Thu, 01 Feb 2007) $ 042 */ 043 public class AuthenticatorDecoder implements Decoder, DecoderFactory 044 { 045 public Decoder getDecoder() 046 { 047 return new AuthenticatorDecoder(); 048 } 049 050 051 public Encodable decode( byte[] encodedAuthenticator ) throws IOException 052 { 053 ASN1InputStream ais = new ASN1InputStream( encodedAuthenticator ); 054 055 DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject(); 056 057 DERSequence sequence = ( DERSequence ) app.getObject(); 058 059 return decode( sequence ); 060 } 061 062 063 /** 064 * -- Unencrypted authenticator 065 * Authenticator ::= [APPLICATION 2] SEQUENCE 066 * { 067 * authenticator-vno[0] INTEGER, 068 * crealm[1] Realm, 069 * cname[2] PrincipalName, 070 * cksum[3] Checksum OPTIONAL, 071 * cusec[4] INTEGER, 072 * ctime[5] KerberosTime, 073 * subkey[6] EncryptionKey OPTIONAL, 074 * seq-number[7] INTEGER OPTIONAL, 075 * 076 * authorization-data[8] AuthorizationData OPTIONAL 077 * } 078 */ 079 protected static Authenticator decode( DERSequence sequence ) 080 { 081 AuthenticatorModifier modifier = new AuthenticatorModifier(); 082 083 for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); ) 084 { 085 DERTaggedObject object = ( DERTaggedObject ) e.nextElement(); 086 int tag = object.getTagNo(); 087 DEREncodable derObject = object.getObject(); 088 089 switch ( tag ) 090 { 091 case 0: 092 DERInteger tag0 = ( DERInteger ) derObject; 093 modifier.setVersionNumber( tag0.intValue() ); 094 break; 095 case 1: 096 DERGeneralString tag1 = ( DERGeneralString ) derObject; 097 modifier.setClientRealm( tag1.getString() ); 098 break; 099 case 2: 100 DERSequence tag2 = ( DERSequence ) derObject; 101 modifier.setClientName( PrincipalNameDecoder.decode( tag2 ) ); 102 break; 103 case 3: 104 DERSequence tag3 = ( DERSequence ) derObject; 105 modifier.setChecksum( ChecksumDecoder.decode( tag3 ) ); 106 break; 107 case 4: 108 DERInteger tag4 = ( DERInteger ) derObject; 109 modifier.setClientMicroSecond( tag4.intValue() ); 110 break; 111 case 5: 112 DERGeneralizedTime tag5 = ( DERGeneralizedTime ) derObject; 113 modifier.setClientTime( KerberosTimeDecoder.decode( tag5 ) ); 114 break; 115 case 6: 116 DERSequence tag6 = ( DERSequence ) derObject; 117 modifier.setSubSessionKey( EncryptionKeyDecoder.decode( tag6 ) ); 118 break; 119 case 7: 120 DERInteger tag7 = ( DERInteger ) derObject; 121 modifier.setSequenceNumber( tag7.intValue() ); 122 break; 123 case 8: 124 DERSequence tag8 = ( DERSequence ) derObject; 125 modifier.setAuthorizationData( AuthorizationDataDecoder.decodeSequence( tag8 ) ); 126 break; 127 } 128 } 129 130 return modifier.getAuthenticator(); 131 } 132 }