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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 org.apache.qpid.util.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.security.sasl.SaslClientFactory;
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;
/**
* DynamicSaslRegistrar provides a collection of helper methods for reading a configuration file that contains a mapping
* from SASL mechanism names to implementing client factory class names and registering a security provider with the
* Java runtime system, that uses the configured client factory implementations.
*
* <p/>The sasl configuration should be specified in a properties file, refered to by the System property
* "amp.dynamicsaslregistrar.properties". The format of the properties file is:
*
* <p/><pre>
* mechanism=fully.qualified.class.name
* </pre>
*
* <p/>Where mechanism is an IANA-registered mechanism name and the fully qualified class name refers to a class that
* implements javax.security.sasl.SaslClientFactory and provides the specified mechanism.
*
* <p><table id="crc"><caption>CRC Card</caption> <tr><th> Responsibilities <th> Collaborations <tr><td> Parse SASL
* mechanism properties. <tr><td> Create and register security provider for SASL mechanisms. </table>
*/
public class DynamicSaslRegistrar
{
private static final Logger _logger = LoggerFactory.getLogger(DynamicSaslRegistrar.class);
/** The name of the system property that holds the name of the SASL configuration properties. */
private static final String FILE_PROPERTY = "amq.dynamicsaslregistrar.properties";
/** The default name of the SASL properties file resource. */
public static final String DEFAULT_RESOURCE_NAME = "org/apache/qpid/client/security/DynamicSaslRegistrar.properties";
/** Reads the properties file, and creates a dynamic security provider to register the SASL implementations with. */
public static void registerSaslProviders()
{
_logger.debug("public static void registerSaslProviders(): called");
// Open the SASL properties file, using the default name is one is not specified.
String filename = System.getProperty(FILE_PROPERTY);
InputStream is =
FileUtils.openFileOrDefaultResource(filename, DEFAULT_RESOURCE_NAME,
DynamicSaslRegistrar.class.getClassLoader());
try
{
Properties props = new Properties();
props.load(is);
_logger.debug("props = " + props);
Map<String, Class<? extends SaslClientFactory>> factories = parseProperties(props);
if (factories.size() > 0)
{
// Ensure we are used before the defaults
if (Security.insertProviderAt(new JCAProvider(factories), 1) == -1)
{
_logger.error("Unable to load custom SASL providers.");
}
else
{
_logger.info("Additional SASL providers successfully registered.");
}
}
else
{
_logger.warn("No additional SASL providers registered.");
}
}
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);
}
}
}
}
/**
* Either attempts to open the specified filename as an input stream, or uses the default SASL configuration
* resource.
*
* @param filename The name of the file to get the SASL properties from, null to use the default.
*
* @return An input stream to read the dynamic SASL configuration from, or null if one could not be opened.
*/
/*private static InputStream openPropertiesInputStream(String filename)
{
InputStream is = null;
// Flag to indicate whether the default resource should be used. By default this is true, so that the default
// is used when opening the file fails.
boolean useDefault = true;
// Try to open the file if one was specified.
if (filename != null)
{
try
{
is = new BufferedInputStream(new FileInputStream(new File(filename)));
// Clear the default flag because the file was succesfully opened.
useDefault = false;
}
catch (FileNotFoundException e)
{
_logger.error("Unable to read from file " + filename + ": " + e, e);
}
}
// Load the default resource if a file was not specified, or if opening the file failed.
if (useDefault)
{
is = CallbackHandlerRegistry.class.getResourceAsStream(DEFAULT_RESOURCE_NAME);
}
return is;
}*/
/**
* Parses the specified properties as a mapping from IANA registered SASL mechanism names to implementing client
* factories. If the client factories cannot be instantiated or do not implement SaslClientFactory then the
* properties refering to them are ignored.
*
* @param props The properties to scan for Sasl client factory implementations.
*
* @return A map from SASL mechanism names to implementing client factory classes.
*
* @todo Why tree map here? Do really want mechanisms in alphabetical order? Seems more likely that the declared
* order of the mechanisms is intended to be preserved, so that they are registered in the declared order of
* preference. Consider LinkedHashMap instead.
*/
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;
}
_logger.debug("Registering class "+ clazz.getName() +" for mechanism "+mechanism);
factoriesToRegister.put(mechanism, (Class<? extends SaslClientFactory>) clazz);
}
catch (Exception ex)
{
_logger.error("Error instantiating SaslClientFactory calss " + className + " - skipping");
}
}
return factoriesToRegister;
}
}
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