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.value.PaData; 027 import org.apache.directory.server.kerberos.shared.messages.value.types.PaDataType; 028 import org.apache.directory.shared.asn1.der.ASN1InputStream; 029 import org.apache.directory.shared.asn1.der.DEREncodable; 030 import org.apache.directory.shared.asn1.der.DERInteger; 031 import org.apache.directory.shared.asn1.der.DEROctetString; 032 import org.apache.directory.shared.asn1.der.DERSequence; 033 import org.apache.directory.shared.asn1.der.DERTaggedObject; 034 035 036 /** 037 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 038 * @version $Rev: 587624 $, $Date: 2007-10-23 21:22:08 +0200 (Tue, 23 Oct 2007) $ 039 */ 040 public class PreAuthenticationDataDecoder 041 { 042 /** 043 * Decodes a byte array into {@link PaData}. 044 * 045 * @param encodedPreAuthData 046 * @return The {@link PaData}. 047 * @throws IOException 048 */ 049 public PaData decode( byte[] encodedPreAuthData ) throws IOException 050 { 051 ASN1InputStream ais = new ASN1InputStream( encodedPreAuthData ); 052 053 DERSequence sequence = ( DERSequence ) ais.readObject(); 054 055 return decode( sequence ); 056 } 057 058 059 /** 060 * KDC-REQ ::= SEQUENCE { 061 * pvno[1] INTEGER, 062 * msg-type[2] INTEGER, 063 * padata[3] SEQUENCE OF PA-DATA OPTIONAL, 064 * req-body[4] KDC-REQ-BODY 065 * } 066 */ 067 protected static PaData[] decodeSequence( DERSequence sequence ) 068 { 069 PaData[] paDataSequence = new PaData[sequence.size()]; 070 071 int ii = 0; 072 073 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); ) 074 { 075 DERSequence object = ( DERSequence ) e.nextElement(); 076 PaData paData = PreAuthenticationDataDecoder.decode( object ); 077 paDataSequence[ii] = paData; 078 ii++; 079 } 080 081 return paDataSequence; 082 } 083 084 085 /** 086 * PA-DATA ::= SEQUENCE { 087 * padata-type[1] INTEGER, 088 * padata-value[2] OCTET STRING, 089 * -- might be encoded AP-REQ 090 * } 091 */ 092 protected static PaData decode( DERSequence sequence ) 093 { 094 PaData paData = new PaData(); 095 096 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); ) 097 { 098 DERTaggedObject object = ( DERTaggedObject ) e.nextElement(); 099 int tag = object.getTagNo(); 100 DEREncodable derObject = object.getObject(); 101 102 switch ( tag ) 103 { 104 case 1: 105 DERInteger padataType = ( DERInteger ) derObject; 106 PaDataType type = PaDataType.getTypeByOrdinal( padataType.intValue() ); 107 paData.setPaDataType( type ); 108 break; 109 case 2: 110 DEROctetString padataValue = ( DEROctetString ) derObject; 111 paData.setPaDataValue( padataValue.getOctets() ); 112 break; 113 } 114 } 115 116 return paData; 117 } 118 }