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/*
* Copyright (c) 2008, 2009, 2011, 2012, 2015, 2016, 2019 Eike Stepper (Loehne, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.security;
import org.eclipse.net4j.util.concurrent.ConcurrencyUtil;
import org.eclipse.net4j.util.fsm.ITransition;
import java.nio.ByteBuffer;
/**
* @author Eike Stepper
*/
public abstract class ChallengeResponseNegotiator extends Negotiator<IChallengeResponse.State, IChallengeResponse.Event> implements IChallengeResponse
{
private String encryptionAlgorithmName = SecurityUtil.PBE_WITH_MD5_AND_DES;
private byte[] encryptionSaltBytes = SecurityUtil.DEFAULT_SALT;
private int encryptionIterationCount = SecurityUtil.DEFAULT_ITERATION_COUNT;
public ChallengeResponseNegotiator(boolean initiator)
{
super(State.class, Event.class, State.INITIAL, State.SUCCESS, State.FAILURE, Event.START, Event.BUFFER, initiator);
init(State.INITIAL, Event.START, new Transition()
{
@Override
protected void execute(INegotiationContext context, ByteBuffer NULL)
{
// Create and transmit challenge
ByteBuffer challenge = context.getBuffer();
createChallenge(context, challenge);
context.transmitBuffer(challenge);
// Set context state
changeState(context, State.CHALLENGE);
}
});
init(State.INITIAL, Event.BUFFER, new Transition()
{
@Override
protected void execute(INegotiationContext context, ByteBuffer challenge)
{
// Handle challenge and transmit response
ByteBuffer response = context.getBuffer();
handleChallenge(context, challenge, response);
context.transmitBuffer(response);
// Set context state
changeState(context, State.RESPONSE);
}
});
init(State.CHALLENGE, Event.BUFFER, new Transition()
{
@Override
protected void execute(INegotiationContext context, ByteBuffer response)
{
// Handle response
boolean success = handleResponse(context, response);
// Transmit acknowledgement
ByteBuffer acknowledgement = context.getBuffer();
acknowledgement.put(success ? ACKNOWLEDGE_SUCCESS : ACKNOWLEDGE_FAILURE);
context.transmitBuffer(acknowledgement);
ConcurrencyUtil.sleep(500);
// Set context state
changeState(context, success ? State.SUCCESS : State.FAILURE);
}
});
init(State.RESPONSE, Event.BUFFER, new Transition()
{
@Override
protected void execute(INegotiationContext context, ByteBuffer acknowledgement)
{
boolean success = acknowledgement.get() == ACKNOWLEDGE_SUCCESS;
changeState(context, success ? State.SUCCESS : State.FAILURE);
handleAcknowledgement(context, success);
}
});
}
/**
* @since 2.0
*/
public String getEncryptionAlgorithmName()
{
return encryptionAlgorithmName;
}
/**
* @since 2.0
*/
public void setEncryptionAlgorithmName(String encryptionAlgorithmName)
{
this.encryptionAlgorithmName = encryptionAlgorithmName;
}
/**
* @since 2.0
*/
public byte[] getEncryptionSaltBytes()
{
return encryptionSaltBytes;
}
/**
* @since 2.0
*/
public void setEncryptionSaltBytes(byte[] encryptionSaltBytes)
{
this.encryptionSaltBytes = encryptionSaltBytes;
}
/**
* @since 2.0
*/
public int getEncryptionIterationCount()
{
return encryptionIterationCount;
}
/**
* @since 2.0
*/
public void setEncryptionIterationCount(int encryptionIterationCount)
{
this.encryptionIterationCount = encryptionIterationCount;
}
@Override
protected void doBeforeActivate() throws Exception
{
super.doBeforeActivate();
checkState(encryptionAlgorithmName, "encryptionAlgorithmName"); //$NON-NLS-1$
checkState(encryptionSaltBytes, "encryptionSaltBytes"); //$NON-NLS-1$
checkState(encryptionSaltBytes.length > 0, "encryptionSaltBytes"); //$NON-NLS-1$
checkState(encryptionIterationCount > 0, "encryptionIterationCount"); //$NON-NLS-1$
}
@Override
protected State getState(INegotiationContext subject)
{
return (State)subject.getState();
}
@Override
protected void setState(INegotiationContext subject, State state)
{
subject.setState(state);
}
protected void createChallenge(INegotiationContext context, ByteBuffer challenge)
{
throw new UnsupportedOperationException();
}
protected void handleChallenge(INegotiationContext context, ByteBuffer challenge, ByteBuffer response)
{
throw new UnsupportedOperationException();
}
protected boolean handleResponse(INegotiationContext context, ByteBuffer response)
{
throw new UnsupportedOperationException();
}
/**
* @since 2.0
*/
protected void handleAcknowledgement(INegotiationContext context, boolean success)
{
throw new UnsupportedOperationException();
}
/**
* @author Eike Stepper
*/
protected abstract class Transition implements ITransition<State, Event, INegotiationContext, ByteBuffer>
{
@Override
public final void execute(INegotiationContext context, State state, Event event, ByteBuffer buffer)
{
execute(context, buffer);
}
protected abstract void execute(INegotiationContext context, ByteBuffer buffer);
}
}
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