UsernameHashedPasswordCallbackHandler.java revision d7955ce24d294fb2014c59d11fca184471056f44 
1/*
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements.  See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership.  The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License.  You may obtain a copy of the License at
10 *
11 *   http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied.  See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 *
20 */
21package org.apache.qpid.management.common.sasl;
22
23import org.apache.harmony.javax.security.auth.callback.Callback;
24import org.apache.harmony.javax.security.auth.callback.CallbackHandler;
25import org.apache.harmony.javax.security.auth.callback.NameCallback;
26import org.apache.harmony.javax.security.auth.callback.PasswordCallback;
27import org.apache.harmony.javax.security.auth.callback.UnsupportedCallbackException;
28import java.io.IOException;
29import java.io.UnsupportedEncodingException;
30import java.security.MessageDigest;
31import java.security.NoSuchAlgorithmException;
32
33
34public class UsernameHashedPasswordCallbackHandler implements CallbackHandler
35{
36    private String user;
37    private char[] pwchars;
38
39    public UsernameHashedPasswordCallbackHandler(String user, String password) throws Exception
40    {
41        this.user = user;
42        this.pwchars = getHash(password);
43    }
44
45    public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException
46    {
47        for (int i = 0; i < callbacks.length; i++)
48        {
49            if (callbacks[i] instanceof NameCallback)
50            {
51                NameCallback ncb = (NameCallback) callbacks[i];
52                ncb.setName(user);
53            }
54            else if (callbacks[i] instanceof PasswordCallback)
55            {
56                PasswordCallback pcb = (PasswordCallback) callbacks[i];
57                pcb.setPassword(pwchars);
58            }
59            else
60            {
61                throw new UnsupportedCallbackException(callbacks[i]);
62            }
63        }
64    }
65
66
67    private void clearPassword()
68    {
69        if (pwchars != null)
70        {
71            for (int i = 0 ; i < pwchars.length ; i++)
72            {
73                pwchars[i] = 0;
74            }
75            pwchars = null;
76        }
77    }
78
79    protected void finalize()
80    {
81        clearPassword();
82    }
83
84    public static char[] getHash(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException
85    {
86        byte[] data = text.getBytes("utf-8");
87
88        MessageDigest md = MessageDigest.getInstance("MD5");
89
90        for (byte b : data)
91        {
92            md.update(b);
93        }
94
95        byte[] digest = md.digest();
96
97        char[] hash = new char[digest.length ];
98
99        int index = 0;
100        for (byte b : digest)
101        {
102            hash[index++] = (char) b;
103        }
104
105        return hash;
106    }
107}
108