/*
* 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.protocol;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import javax.security.auth.kerberos.KerberosPrincipal;
import org.apache.directory.server.i18n.I18n;
import org.apache.directory.server.kerberos.kdc.KdcServer;
import org.apache.directory.server.kerberos.kdc.authentication.AuthenticationContext;
import org.apache.directory.server.kerberos.kdc.authentication.AuthenticationService;
import org.apache.directory.server.kerberos.kdc.ticketgrant.TicketGrantingContext;
import org.apache.directory.server.kerberos.kdc.ticketgrant.TicketGrantingService;
import org.apache.directory.server.kerberos.shared.store.PrincipalStore;
import org.apache.directory.shared.kerberos.KerberosMessageType;
import org.apache.directory.shared.kerberos.KerberosTime;
import org.apache.directory.shared.kerberos.components.KdcReq;
import org.apache.directory.shared.kerberos.components.PrincipalName;
import org.apache.directory.shared.kerberos.exceptions.ErrorType;
import org.apache.directory.shared.kerberos.exceptions.KerberosException;
import org.apache.directory.shared.kerberos.messages.KrbError;
import org.apache.mina.core.service.IoHandler;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The Kerberos protocol handler for MINA which handles requests for the authentication
* service and the ticket granting service of the KDC.
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public class KerberosProtocolHandler implements IoHandler
{
/** The logger for this class */
private static final Logger log = LoggerFactory.getLogger( KerberosProtocolHandler.class );
/** The KDC server instance */
private KdcServer config;
/** The principal Name store */
private PrincipalStore store;
private static final String CONTEXT_KEY = "context";
/**
* Creates a new instance of KerberosProtocolHandler.
*
* @param config
* @param store
*/
public KerberosProtocolHandler( KdcServer config, PrincipalStore store )
{
this.config = config;
this.store = store;
}
public void sessionCreated( IoSession session ) throws Exception
{
if ( log.isDebugEnabled() )
{
log.debug( "{} CREATED: {}", session.getRemoteAddress(), session.getTransportMetadata() );
}
}
public void sessionOpened( IoSession session )
{
if ( log.isDebugEnabled() )
{
log.debug( "{} OPENED", session.getRemoteAddress() );
}
}
public void sessionClosed( IoSession session )
{
if ( log.isDebugEnabled() )
{
log.debug( "{} CLOSED", session.getRemoteAddress() );
}
}
public void sessionIdle( IoSession session, IdleStatus status )
{
if ( log.isDebugEnabled() )
{
log.debug( "{} IDLE ({})", session.getRemoteAddress(), status );
}
}
public void exceptionCaught( IoSession session, Throwable cause )
{
log.error( session.getRemoteAddress() + " EXCEPTION", cause );
session.close( true );
}
public void messageReceived( IoSession session, Object message )
{
if ( log.isDebugEnabled() )
{
log.debug( "{} RCVD: {}", session.getRemoteAddress(), message );
}
InetAddress clientAddress = ( ( InetSocketAddress ) session.getRemoteAddress() ).getAddress();
if ( !( message instanceof KdcReq ) )
{
log.error( I18n.err( I18n.ERR_152, ErrorType.KRB_AP_ERR_BADDIRECTION ) );
session.write( getErrorMessage( config.getServicePrincipal(), new KerberosException(
ErrorType.KRB_AP_ERR_BADDIRECTION ) ) );
return;
}
KdcReq request = ( KdcReq ) message;
KerberosMessageType messageType = request.getMessageType();
try
{
switch ( messageType )
{
case AS_REQ:
AuthenticationContext authContext = new AuthenticationContext();
authContext.setConfig( config );
authContext.setStore( store );
authContext.setClientAddress( clientAddress );
authContext.setRequest( request );
session.setAttribute( CONTEXT_KEY, authContext );
AuthenticationService.execute( authContext );
session.write( authContext.getReply() );
break;
case TGS_REQ:
TicketGrantingContext tgsContext = new TicketGrantingContext();
tgsContext.setConfig( config );
tgsContext.setStore( store );
tgsContext.setClientAddress( clientAddress );
tgsContext.setRequest( request );
session.setAttribute( CONTEXT_KEY, tgsContext );
TicketGrantingService.execute( tgsContext );
session.write( tgsContext.getReply() );
break;
case AS_REP:
case TGS_REP:
throw new KerberosException( ErrorType.KRB_AP_ERR_BADDIRECTION );
default:
throw new KerberosException( ErrorType.KRB_AP_ERR_MSG_TYPE );
}
}
catch ( KerberosException ke )
{
String messageText = ke.getLocalizedMessage() + " (" + ke.getErrorCode() + ")";
if ( log.isDebugEnabled() )
{
log.warn( messageText, ke );
}
else
{
log.warn( messageText );
}
KrbError error = getErrorMessage( config.getServicePrincipal(), ke );
if ( log.isDebugEnabled() )
{
logErrorMessage( error );
}
session.write( error );
}
catch ( Exception e )
{
log.error( I18n.err( I18n.ERR_152, e.getLocalizedMessage() ), e );
session.write( getErrorMessage( config.getServicePrincipal(), new KerberosException(
ErrorType.KDC_ERR_SVC_UNAVAILABLE ) ) );
}
}
public void messageSent( IoSession session, Object message )
{
if ( log.isDebugEnabled() )
{
log.debug( "{} SENT: {}", session.getRemoteAddress(), message );
}
}
protected KrbError getErrorMessage( KerberosPrincipal principal, KerberosException exception )
{
KrbError krbError = new KrbError();
KerberosTime now = new KerberosTime();
krbError.setErrorCode( ErrorType.getTypeByValue( exception.getErrorCode() ) );
krbError.setEText( exception.getLocalizedMessage() );
krbError.setSName( new PrincipalName( principal ) );
krbError.setRealm( principal.getRealm() );
krbError.setSTime( now );
krbError.setSusec( 0 );
krbError.setEData( exception.getExplanatoryData() );
return krbError;
}
protected void logErrorMessage( KrbError error )
{
try
{
StringBuffer sb = new StringBuffer();
sb.append( "Responding to request with error:" );
sb.append( "\n\t" + "explanatory text: " + error.getEText() );
sb.append( "\n\t" + "error code: " + error.getErrorCode() );
sb.append( "\n\t" + "clientPrincipal: " + error.getCName() ).append( "@" ).append( error.getCRealm() );
sb.append( "\n\t" + "client time: " + error.getCTime() );
sb.append( "\n\t" + "serverPrincipal: " + error.getSName() ).append( "@" ).append( error.getRealm() );
sb.append( "\n\t" + "server time: " + error.getSTime() );
log.debug( sb.toString() );
}
catch ( Exception e )
{
// This is a monitor. No exceptions should bubble up.
log.error( I18n.err( I18n.ERR_155 ), e );
}
}
}