1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/***************************************************************************
* Copyright (c) 2004 - 2007 Eike Stepper, Germany.
* 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.internal.util.security;
import org.eclipse.net4j.util.fsm.ITransition;
import org.eclipse.net4j.util.security.IChallengeResponse;
import org.eclipse.net4j.util.security.INegotiationContext;
import org.eclipse.net4j.util.security.SecurityUtil;
import java.nio.ByteBuffer;
/**
* @author Eike Stepper
*/
public abstract class ChallengeResponseNegotiator extends
Negotiator<IChallengeResponse.State, IChallengeResponse.Event> implements IChallengeResponse
{
public static final String DEFAULT_ALGORITHM_NAME = SecurityUtil.PBE_WITH_MD5_AND_DES;
private String algorithmName = DEFAULT_ALGORITHM_NAME;
public ChallengeResponseNegotiator()
{
super(State.class, Event.class, State.INITIAL, State.SUCCESS, State.FAILURE, Event.START, Event.BUFFER);
init(State.INITIAL, Event.START, new Transition()
{
@Override
protected void execute(INegotiationContext context, ByteBuffer buffer)
{
// 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);
// 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)
{
// Handle acknowledgement
boolean success = acknowledgement.get() == ACKNOWLEDGE_SUCCESS;
// Set context state
changeState(context, success ? State.SUCCESS : State.FAILURE);
}
});
}
public String getAlgorithmName()
{
return algorithmName;
}
public void setAlgorithmName(String algorithmName)
{
this.algorithmName = algorithmName;
}
@Override
protected void doBeforeActivate() throws Exception
{
super.doBeforeActivate();
if (algorithmName == null)
{
throw new IllegalStateException("algorithmName == null");
}
}
@Override
protected State getState(INegotiationContext subject)
{
return (State)subject.getState();
}
@Override
protected void setState(INegotiationContext subject, State state)
{
subject.setState(state);
}
protected abstract void createChallenge(INegotiationContext context, ByteBuffer challenge);
protected abstract void handleChallenge(INegotiationContext context, ByteBuffer challenge, ByteBuffer response);
protected abstract boolean handleResponse(INegotiationContext context, ByteBuffer response);
/**
* @author Eike Stepper
*/
protected abstract class Transition implements ITransition<State, Event, INegotiationContext, ByteBuffer>
{
public final void execute(INegotiationContext context, State state, Event event, ByteBuffer buffer)
{
execute(context, buffer);
}
protected abstract void execute(INegotiationContext context, ByteBuffer buffer);
}
}
|
