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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.client.security;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.security.Security;
import java.util.Enumeration;
import java.util.Map;
import java.util.Properties;
import java.util.TreeMap;
import javax.security.sasl.SaslClientFactory;
import org.apache.log4j.Logger;
public class DynamicSaslRegistrar
{
private static final String FILE_PROPERTY = "amq.dynamicsaslregistrar.properties";
private static final Logger _logger = Logger.getLogger(DynamicSaslRegistrar.class);
public static void registerSaslProviders()
{
InputStream is = openPropertiesInputStream();
try
{
Properties props = new Properties();
props.load(is);
Map<String, Class<? extends SaslClientFactory>> factories = parseProperties(props);
if (factories.size() > 0)
{
Security.addProvider(new JCAProvider(factories));
_logger.debug("Dynamic SASL provider added as a security provider");
}
}
catch (IOException e)
{
_logger.error("Error reading properties: " + e, e);
}
finally
{
if (is != null)
{
try
{
is.close();
}
catch (IOException e)
{
_logger.error("Unable to close properties stream: " + e, e);
}
}
}
}
private static InputStream openPropertiesInputStream()
{
String filename = System.getProperty(FILE_PROPERTY);
boolean useDefault = true;
InputStream is = null;
if (filename != null)
{
try
{
is = new BufferedInputStream(new FileInputStream(new File(filename)));
useDefault = false;
}
catch (FileNotFoundException e)
{
_logger.error("Unable to read from file " + filename + ": " + e, e);
}
}
if (useDefault)
{
is = CallbackHandlerRegistry.class.getResourceAsStream("DynamicSaslRegistrar.properties");
}
return is;
}
private static Map<String, Class<? extends SaslClientFactory>> parseProperties(Properties props)
{
Enumeration e = props.propertyNames();
TreeMap<String, Class<? extends SaslClientFactory>> factoriesToRegister =
new TreeMap<String, Class<? extends SaslClientFactory>>();
while (e.hasMoreElements())
{
String mechanism = (String) e.nextElement();
String className = props.getProperty(mechanism);
try
{
Class<?> clazz = Class.forName(className);
if (!(SaslClientFactory.class.isAssignableFrom(clazz)))
{
_logger.error("Class " + clazz + " does not implement " + SaslClientFactory.class + " - skipping");
continue;
}
factoriesToRegister.put(mechanism, (Class<? extends SaslClientFactory>) clazz);
}
catch (Exception ex)
{
_logger.error("Error instantiating SaslClientFactory calss " + className + " - skipping");
}
}
return factoriesToRegister;
}
}
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