| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.directory.server.kerberos.shared.io.encoder; |
| |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| |
| import org.apache.directory.server.kerberos.shared.messages.Encodable; |
| import org.apache.directory.server.kerberos.shared.messages.components.Authenticator; |
| import org.apache.directory.shared.asn1.der.ASN1OutputStream; |
| import org.apache.directory.shared.asn1.der.DERApplicationSpecific; |
| import org.apache.directory.shared.asn1.der.DERGeneralString; |
| import org.apache.directory.shared.asn1.der.DERInteger; |
| import org.apache.directory.shared.asn1.der.DERSequence; |
| import org.apache.directory.shared.asn1.der.DERTaggedObject; |
| |
| |
| /** |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| * @version $Rev$, $Date$ |
| */ |
| public class AuthenticatorEncoder implements Encoder, EncoderFactory |
| { |
| /** |
| * Application code constant for the {@link Authenticator} (2). |
| */ |
| private static final int APPLICATION_CODE = 2; |
| |
| |
| /** |
| * Encodes an {@link Authenticator} into a byte array. |
| * |
| * @param authenticator |
| * @return The byte array. |
| * @throws IOException |
| */ |
| public byte[] encode( Encodable authenticator ) throws IOException |
| { |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| ASN1OutputStream aos = new ASN1OutputStream( baos ); |
| |
| DERSequence replySequence = encodeInitialSequence( ( Authenticator ) authenticator ); |
| aos.writeObject( DERApplicationSpecific.valueOf( APPLICATION_CODE, replySequence ) ); |
| aos.close(); |
| |
| return baos.toByteArray(); |
| } |
| |
| |
| public Encoder getEncoder() |
| { |
| return new AuthenticatorEncoder(); |
| } |
| |
| |
| /** |
| * Encodes an {@link Authenticator} into a {@link DERSequence}. |
| * |
| * -- Unencrypted authenticator |
| * Authenticator ::= [APPLICATION 2] SEQUENCE |
| * { |
| * authenticator-vno[0] INTEGER, |
| * crealm[1] Realm, |
| * cname[2] PrincipalName, |
| * cksum[3] Checksum OPTIONAL, |
| * cusec[4] INTEGER, |
| * ctime[5] KerberosTime, |
| * subkey[6] EncryptionKey OPTIONAL, |
| * seq-number[7] INTEGER OPTIONAL, |
| * |
| * authorization-data[8] AuthorizationData OPTIONAL |
| * } |
| * |
| * @param authenticator |
| * @return The {@link DERSequence}. |
| */ |
| private DERSequence encodeInitialSequence( Authenticator authenticator ) |
| { |
| String clientRealm = authenticator.getClientRealm(); |
| |
| DERSequence sequence = new DERSequence(); |
| |
| sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( authenticator.getVersionNumber() ) ) ); |
| sequence.add( new DERTaggedObject( 1, DERGeneralString.valueOf( clientRealm ) ) ); |
| sequence.add( new DERTaggedObject( 2, PrincipalNameEncoder.encode( authenticator.getClientPrincipalName() ) ) ); |
| |
| // OPTIONAL |
| if ( authenticator.getChecksum() != null ) |
| { |
| sequence.add( new DERTaggedObject( 3, ChecksumEncoder.encode( authenticator.getChecksum() ) ) ); |
| } |
| |
| sequence.add( new DERTaggedObject( 4, DERInteger.valueOf( authenticator.getClientMicroSecond() ) ) ); |
| sequence.add( new DERTaggedObject( 5, KerberosTimeEncoder.encode( authenticator.getClientTime() ) ) ); |
| |
| // OPTIONAL |
| if ( authenticator.getSubSessionKey() != null ) |
| { |
| sequence.add( new DERTaggedObject( 6, EncryptionKeyEncoder |
| .encodeSequence( authenticator.getSubSessionKey() ) ) ); |
| } |
| |
| // OPTIONAL |
| if ( authenticator.getSequenceNumber() > 0 ) |
| { |
| sequence.add( new DERTaggedObject( 7, DERInteger.valueOf( authenticator.getSequenceNumber() ) ) ); |
| } |
| |
| // OPTIONAL |
| if ( authenticator.getAuthorizationData() != null ) |
| { |
| sequence.add( new DERTaggedObject( 8, AuthorizationDataEncoder |
| .encode( authenticator.getAuthorizationData() ) ) ); |
| } |
| |
| return sequence; |
| } |
| } |