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/*
*
* 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.qpid.management.common.sasl;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
public class UsernameHashedPasswordCallbackHandler implements CallbackHandler
{
private String user;
private char[] pwchars;
public UsernameHashedPasswordCallbackHandler(String user, String password) throws Exception
{
this.user = user;
this.pwchars = getHash(password);
}
public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException
{
for (int i = 0; i < callbacks.length; i++)
{
if (callbacks[i] instanceof NameCallback)
{
NameCallback ncb = (NameCallback) callbacks[i];
ncb.setName(user);
}
else if (callbacks[i] instanceof PasswordCallback)
{
PasswordCallback pcb = (PasswordCallback) callbacks[i];
pcb.setPassword(pwchars);
}
else
{
throw new UnsupportedCallbackException(callbacks[i]);
}
}
}
private void clearPassword()
{
if (pwchars != null)
{
for (int i = 0 ; i < pwchars.length ; i++)
{
pwchars[i] = 0;
}
pwchars = null;
}
}
protected void finalize()
{
clearPassword();
}
public static char[] getHash(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException
{
byte[] data = text.getBytes("utf-8");
MessageDigest md = MessageDigest.getInstance("MD5");
for (byte b : data)
{
md.update(b);
}
byte[] digest = md.digest();
char[] hash = new char[digest.length ];
int index = 0;
for (byte b : digest)
{
hash[index++] = (char) b;
}
return hash;
}
}
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