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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.server.security.auth;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.security.Principal;
import java.util.regex.Pattern;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.login.AccountNotFoundException;
import org.apache.log4j.Logger;
/**
* Represents a user database where the account information is stored in a simple flat file.
*
* The file is expected to be in the form:
* username:password
* username1:password1
* ...
* usernamen:passwordn
*
* where a carriage return separates each username/password pair. Passwords are assumed to be in
* plain text.
*
*/
public class PasswordFilePrincipalDatabase implements PrincipalDatabase
{
private static final Logger _logger = Logger.getLogger(PasswordFilePrincipalDatabase.class);
private File _passwordFile;
private Pattern _regexp = Pattern.compile(":");
public PasswordFilePrincipalDatabase()
{
}
public void setPasswordFile(String passwordFile) throws FileNotFoundException
{
File f = new File(passwordFile);
_logger.info("PasswordFilePrincipalDatabase using file " + f.getAbsolutePath());
_passwordFile = f;
if (!f.exists())
{
throw new FileNotFoundException("Cannot find password file " + f);
}
if (!f.canRead())
{
throw new FileNotFoundException("Cannot read password file " + f +
". Check permissions.");
}
}
public void setPassword(Principal principal, PasswordCallback callback) throws IOException,
AccountNotFoundException
{
if (_passwordFile == null)
{
throw new AccountNotFoundException("Unable to locate principal since no password file was specified during initialisation");
}
if (principal == null)
{
throw new IllegalArgumentException("principal must not be null");
}
char[] pwd = lookupPassword(principal.getName());
if (pwd != null)
{
callback.setPassword(pwd);
}
else
{
throw new AccountNotFoundException("No account found for principal " + principal);
}
}
/**
* Looks up the password for a specified user in the password file.
* Note this code is <b>not</b> secure since it creates strings of passwords. It should be modified
* to create only char arrays which get nulled out.
* @param name
* @return
* @throws IOException
*/
private char[] lookupPassword(String name) throws IOException
{
BufferedReader reader = null;
try
{
reader = new BufferedReader(new FileReader(_passwordFile));
String line;
while ((line = reader.readLine()) != null)
{
String[] result = _regexp.split(line);
if (result == null || result.length < 2)
{
continue;
}
if (name.equals(result[0]))
{
return result[1].toCharArray();
}
}
return null;
}
finally
{
if (reader != null)
{
reader.close();
}
}
}
}
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