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ActiveMQ example source code file (JaasCertificateAuthenticationBroker.java)

This example ActiveMQ source code file (JaasCertificateAuthenticationBroker.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

callbackhandler, classloader, connectioninfo, exception, exception, jaascertificateauthenticationbroker, jaascertificateauthenticationbroker, logincontext, logincontext, security, securityexception, string, string, subject, unable, util

The ActiveMQ JaasCertificateAuthenticationBroker.java source code

/**
 * 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.activemq.security;

import java.security.Principal;
import java.security.cert.X509Certificate;
import java.util.Iterator;

import javax.security.auth.Subject;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.login.LoginContext;

import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.BrokerFilter;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.command.ConnectionInfo;
import org.apache.activemq.jaas.JaasCertificateCallbackHandler;
import org.apache.activemq.jaas.UserPrincipal;

/**
 * A JAAS Authentication Broker that uses SSL Certificates. This class will
 * provide the JAAS framework with a JaasCertificateCallbackHandler that will
 * grant JAAS access to incoming connections' SSL certificate chains. NOTE:
 * There is a chance that the incoming connection does not have a valid
 * certificate (has null).
 * 
 * @author sepandm@gmail.com (Sepand)
 */
public class JaasCertificateAuthenticationBroker extends BrokerFilter {
    private final String jaasConfiguration;

    /**
     * Simple constructor. Leaves everything to superclass.
     * 
     * @param next The Broker that does the actual work for this Filter.
     * @param jassConfiguration The JAAS domain configuration name (refere to
     *                JAAS documentation).
     */
    public JaasCertificateAuthenticationBroker(Broker next, String jaasConfiguration) {
        super(next);

        this.jaasConfiguration = jaasConfiguration;
    }

    /**
     * Overridden to allow for authentication based on client certificates.
     * Connections being added will be authenticated based on their certificate
     * chain and the JAAS module specified through the JAAS framework. NOTE: The
     * security context's username will be set to the first UserPrincipal
     * created by the login module.
     * 
     * @param context The context for the incoming Connection.
     * @param info The ConnectionInfo Command representing the incoming
     *                connection.
     */
    public void addConnection(ConnectionContext context, ConnectionInfo info) throws Exception {

        if (context.getSecurityContext() == null) {
            if (!(info.getTransportContext() instanceof X509Certificate[])) {
                throw new SecurityException("Unable to authenticate transport without SSL certificate.");
            }

            // Set the TCCL since it seems JAAS needs it to find the login
            // module classes.
            ClassLoader original = Thread.currentThread().getContextClassLoader();
            Thread.currentThread().setContextClassLoader(JaasAuthenticationBroker.class.getClassLoader());
            try {
                // Do the login.
                try {
                    CallbackHandler callback = new JaasCertificateCallbackHandler((X509Certificate[])info.getTransportContext());
                    LoginContext lc = new LoginContext(jaasConfiguration, callback);
                    lc.login();
                    Subject subject = lc.getSubject();

                    String dnName = "";

                    for (Iterator iter = subject.getPrincipals().iterator(); iter.hasNext();) {
                        Principal nextPrincipal = (Principal)iter.next();
                        if (nextPrincipal instanceof UserPrincipal) {
                            dnName = ((UserPrincipal)nextPrincipal).getName();
                            break;
                        }
                    }
                    SecurityContext s = new JaasCertificateSecurityContext(dnName, subject, (X509Certificate[])info.getTransportContext());
                    context.setSecurityContext(s);
                } catch (Exception e) {
                    throw new SecurityException("User name or password is invalid: " + e.getMessage(), e);
                }
            } finally {
                Thread.currentThread().setContextClassLoader(original);
            }
        }
        super.addConnection(context, info);
    }

    /**
     * Overriding removeConnection to make sure the security context is cleaned.
     */
    public void removeConnection(ConnectionContext context, ConnectionInfo info, Throwable error) throws Exception {
        super.removeConnection(context, info, error);

        context.setSecurityContext(null);
    }
}

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