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.value.AuthorizationData; 028 import org.apache.directory.server.kerberos.shared.messages.value.AuthorizationDataEntry; 029 import org.apache.directory.server.kerberos.shared.messages.value.types.AuthorizationType; 030 import org.apache.directory.shared.asn1.der.ASN1InputStream; 031 import org.apache.directory.shared.asn1.der.DEREncodable; 032 import org.apache.directory.shared.asn1.der.DERInteger; 033 import org.apache.directory.shared.asn1.der.DEROctetString; 034 import org.apache.directory.shared.asn1.der.DERSequence; 035 import org.apache.directory.shared.asn1.der.DERTaggedObject; 036 037 038 /** 039 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 040 * @version $Rev: 587531 $, $Date: 2007-10-23 16:59:10 +0200 (Tue, 23 Oct 2007) $ 041 */ 042 public class AuthorizationDataDecoder implements Decoder, DecoderFactory 043 { 044 public Decoder getDecoder() 045 { 046 return new AuthorizationDataDecoder(); 047 } 048 049 050 public Encodable decode( byte[] encodedAuthData ) throws IOException 051 { 052 ASN1InputStream ais = new ASN1InputStream( encodedAuthData ); 053 054 DERSequence sequence = ( DERSequence ) ais.readObject(); 055 056 return decodeSequence( sequence ); 057 } 058 059 060 /** 061 * AuthorizationData ::= SEQUENCE OF SEQUENCE { 062 * ad-type[0] INTEGER, 063 * ad-data[1] OCTET STRING 064 * } 065 */ 066 protected static AuthorizationData decodeSequence( DERSequence sequence ) 067 { 068 AuthorizationData authData = new AuthorizationData(); 069 070 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); ) 071 { 072 DERSequence object = ( DERSequence ) e.nextElement(); 073 AuthorizationDataEntry entry = decodeAuthorizationEntry( object ); 074 authData.add( entry ); 075 } 076 077 return authData; 078 } 079 080 081 protected static AuthorizationDataEntry decodeAuthorizationEntry( DERSequence sequence ) 082 { 083 AuthorizationType type = AuthorizationType.NULL; 084 byte[] data = null; 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 DERInteger tag0 = ( DERInteger ) derObject; 096 type = AuthorizationType.getTypeByOrdinal( tag0.intValue() ); 097 break; 098 099 case 1: 100 DEROctetString tag1 = ( DEROctetString ) derObject; 101 data = tag1.getOctets(); 102 break; 103 } 104 } 105 106 return new AuthorizationDataEntry( type, data ); 107 } 108 }