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.nio.ByteBuffer;
025 import java.util.Enumeration;
026
027 import org.apache.directory.server.kerberos.shared.messages.ErrorMessage;
028 import org.apache.directory.server.kerberos.shared.messages.ErrorMessageModifier;
029 import org.apache.directory.server.kerberos.shared.messages.value.KerberosPrincipalModifier;
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.DEREncodable;
033 import org.apache.directory.shared.asn1.der.DERGeneralString;
034 import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
035 import org.apache.directory.shared.asn1.der.DERInteger;
036 import org.apache.directory.shared.asn1.der.DEROctetString;
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 $Rev$, $Date$
044 */
045 public class ErrorMessageDecoder
046 {
047 /**
048 * Decodes a {@link ByteBuffer} into an {@link ErrorMessage}.
049 *
050 * KRB-ERROR ::= [APPLICATION 30] SEQUENCE
051 *
052 * @param in
053 * @return The {@link ErrorMessage}.
054 * @throws IOException
055 */
056 public ErrorMessage decode( ByteBuffer in ) throws IOException
057 {
058 ASN1InputStream ais = new ASN1InputStream( in );
059
060 DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
061
062 DERSequence errorMessage = ( DERSequence ) app.getObject();
063
064 return decodeErrorMessageSequence( errorMessage );
065 }
066
067
068 /*
069 KRB-ERROR ::= [APPLICATION 30] SEQUENCE {
070 pvno [0] INTEGER (5),
071 msg-type [1] INTEGER (30),
072 ctime [2] KerberosTime OPTIONAL,
073 cusec [3] Microseconds OPTIONAL,
074 stime [4] KerberosTime,
075 susec [5] Microseconds,
076 error-code [6] Int32,
077 crealm [7] Realm OPTIONAL,
078 cname [8] PrincipalName OPTIONAL,
079 realm [9] Realm -- service realm --,
080 sname [10] PrincipalName -- service name --,
081 e-text [11] KerberosString OPTIONAL,
082 e-data [12] OCTET STRING OPTIONAL
083 }
084 */
085 private ErrorMessage decodeErrorMessageSequence( DERSequence sequence )
086 {
087 ErrorMessageModifier errorModifier = new ErrorMessageModifier();
088 KerberosPrincipalModifier clientModifier = new KerberosPrincipalModifier();
089 KerberosPrincipalModifier serverModifier = new KerberosPrincipalModifier();
090
091 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
092 {
093 DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
094 int tag = object.getTagNo();
095 DEREncodable derObject = object.getObject();
096
097 switch ( tag )
098 {
099 case 0:
100 // DERInteger tag0 = ( DERInteger ) derObject;
101 // int pvno = tag0.intValue();
102 break;
103 case 1:
104 // DERInteger tag1 = ( DERInteger ) derObject;
105 // msgType = MessageType.getTypeByOrdinal( tag1.intValue() );
106 break;
107 case 2:
108 DERGeneralizedTime tag2 = ( DERGeneralizedTime ) derObject;
109 errorModifier.setClientTime( KerberosTimeDecoder.decode( tag2 ) );
110 break;
111 case 3:
112 DERInteger tag3 = ( DERInteger ) derObject;
113 errorModifier.setClientMicroSecond( tag3.intValue() );
114 break;
115 case 4:
116 DERGeneralizedTime tag4 = ( DERGeneralizedTime ) derObject;
117 errorModifier.setServerTime( KerberosTimeDecoder.decode( tag4 ) );
118 break;
119 case 5:
120 DERInteger tag5 = ( DERInteger ) derObject;
121 errorModifier.setServerMicroSecond( tag5.intValue() );
122 break;
123 case 6:
124 DERInteger tag6 = ( DERInteger ) derObject;
125 errorModifier.setErrorCode( tag6.intValue() );
126 break;
127 case 7:
128 DERGeneralString tag7 = ( DERGeneralString ) derObject;
129 clientModifier.setRealm( tag7.getString() );
130 break;
131 case 8:
132 DERSequence tag8 = ( DERSequence ) derObject;
133 clientModifier.setPrincipalName( PrincipalNameDecoder.decode( tag8 ) );
134 break;
135 case 9:
136 DERGeneralString tag9 = ( DERGeneralString ) derObject;
137 serverModifier.setRealm( tag9.getString() );
138 break;
139 case 10:
140 DERSequence tag10 = ( DERSequence ) derObject;
141 serverModifier.setPrincipalName( PrincipalNameDecoder.decode( tag10 ) );
142 break;
143 case 11:
144 DERGeneralString tag11 = ( DERGeneralString ) derObject;
145 errorModifier.setExplanatoryText( tag11.getString() );
146 break;
147 case 12:
148 DEROctetString tag12 = ( DEROctetString ) derObject;
149 errorModifier.setExplanatoryData( tag12.getOctets() );
150 break;
151 }
152 }
153
154 errorModifier.setClientPrincipal( clientModifier.getKerberosPrincipal() );
155 errorModifier.setServerPrincipal( serverModifier.getKerberosPrincipal() );
156
157 return errorModifier.getErrorMessage();
158 }
159 }