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 021package org.apache.directory.shared.kerberos.codec.checksum.actions; 022 023 024import org.apache.directory.api.asn1.DecoderException; 025import org.apache.directory.api.asn1.ber.grammar.GrammarAction; 026import org.apache.directory.api.asn1.ber.tlv.BerValue; 027import org.apache.directory.api.asn1.ber.tlv.IntegerDecoder; 028import org.apache.directory.api.asn1.ber.tlv.IntegerDecoderException; 029import org.apache.directory.api.asn1.ber.tlv.TLV; 030import org.apache.directory.api.i18n.I18n; 031import org.apache.directory.api.util.Strings; 032import org.apache.directory.shared.kerberos.codec.checksum.ChecksumContainer; 033import org.apache.directory.shared.kerberos.components.Checksum; 034import org.apache.directory.shared.kerberos.crypto.checksum.ChecksumType; 035import org.slf4j.Logger; 036import org.slf4j.LoggerFactory; 037 038 039/** 040 * Sets the Checksum's type. 041 * 042 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 043 */ 044public class StoreCksumType extends GrammarAction<ChecksumContainer> 045{ 046 /** The logger */ 047 private static final Logger LOG = LoggerFactory.getLogger( StoreCksumType.class ); 048 049 /** Speedup for logs */ 050 private static final boolean IS_DEBUG = LOG.isDebugEnabled(); 051 052 053 /** 054 * Creates a new instance of ChecksumReadType. 055 */ 056 public StoreCksumType() 057 { 058 super( "Checksum cksumtype" ); 059 } 060 061 062 /** 063 * {@inheritDoc} 064 */ 065 public void action( ChecksumContainer checksumContainer ) throws DecoderException 066 { 067 TLV tlv = checksumContainer.getCurrentTLV(); 068 069 // The Length should not be null 070 if ( tlv.getLength() == 0 ) 071 { 072 LOG.error( I18n.err( I18n.ERR_01308_ZERO_LENGTH_TLV ) ); 073 074 // This will generate a PROTOCOL_ERROR 075 throw new DecoderException( I18n.err( I18n.ERR_01309_EMPTY_TLV ) ); 076 } 077 078 Checksum checksum = checksumContainer.getChecksum(); 079 // The Checksum's type is an integer 080 BerValue value = tlv.getValue(); 081 082 try 083 { 084 int cksumType = IntegerDecoder.parse( value ); 085 086 checksum.setChecksumType( ChecksumType.getTypeByValue( cksumType ) ); 087 088 if ( IS_DEBUG ) 089 { 090 LOG.debug( "cksumType : {}", cksumType ); 091 } 092 } 093 catch ( IntegerDecoderException ide ) 094 { 095 LOG.error( I18n.err( I18n.ERR_01310_INTEGER_DECODING_ERROR, Strings.dumpBytes( value.getData() ) ) ); 096 097 // This will generate a PROTOCOL_ERROR 098 throw new DecoderException( ide.getMessage() ); 099 } 100 101 } 102 103}