001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.security;
018
019import java.security.Principal;
020import java.util.Iterator;
021import java.util.Set;
022import java.util.concurrent.CopyOnWriteArrayList;
023
024import javax.security.auth.Subject;
025import javax.security.auth.login.LoginContext;
026
027import org.apache.activemq.broker.Broker;
028import org.apache.activemq.broker.BrokerFilter;
029import org.apache.activemq.broker.ConnectionContext;
030import org.apache.activemq.command.ConnectionInfo;
031import org.apache.activemq.jaas.JassCredentialCallbackHandler;
032
033/**
034 * Logs a user in using JAAS.
035 * 
036 * 
037 */
038public class JaasAuthenticationBroker extends BrokerFilter {
039
040    private final String jassConfiguration;
041    private final CopyOnWriteArrayList<SecurityContext> securityContexts = new CopyOnWriteArrayList<SecurityContext>();
042
043    public JaasAuthenticationBroker(Broker next, String jassConfiguration) {
044        super(next);
045        this.jassConfiguration = jassConfiguration;
046    }
047
048    static class JaasSecurityContext extends SecurityContext {
049
050        private final Subject subject;
051
052        public JaasSecurityContext(String userName, Subject subject) {
053            super(userName);
054            this.subject = subject;
055        }
056
057        public Set<Principal> getPrincipals() {
058            return subject.getPrincipals();
059        }
060
061    }
062
063    public void addConnection(ConnectionContext context, ConnectionInfo info) throws Exception {
064
065        if (context.getSecurityContext() == null) {
066            // Set the TCCL since it seems JAAS needs it to find the login
067            // module classes.
068            ClassLoader original = Thread.currentThread().getContextClassLoader();
069            Thread.currentThread().setContextClassLoader(JaasAuthenticationBroker.class.getClassLoader());
070            try {
071                // Do the login.
072                try {
073                    JassCredentialCallbackHandler callback = new JassCredentialCallbackHandler(info
074                        .getUserName(), info.getPassword());
075                    LoginContext lc = new LoginContext(jassConfiguration, callback);
076                    lc.login();
077                    Subject subject = lc.getSubject();
078
079                    SecurityContext s = new JaasSecurityContext(info.getUserName(), subject);
080                    context.setSecurityContext(s);
081                    securityContexts.add(s);
082                } catch (Exception e) {
083                    throw (SecurityException)new SecurityException("User name [" + info.getUserName() + "] or password is invalid.")
084                        .initCause(e);
085                }
086            } finally {
087                Thread.currentThread().setContextClassLoader(original);
088            }
089        }
090        super.addConnection(context, info);
091    }
092
093    public void removeConnection(ConnectionContext context, ConnectionInfo info, Throwable error)
094        throws Exception {
095        super.removeConnection(context, info, error);
096        if (securityContexts.remove(context.getSecurityContext())) {
097            context.setSecurityContext(null);
098        }
099    }
100
101    /**
102     * Previously logged in users may no longer have the same access anymore.
103     * Refresh all the logged into users.
104     */
105    public void refresh() {
106        for (Iterator<SecurityContext> iter = securityContexts.iterator(); iter.hasNext();) {
107            SecurityContext sc = iter.next();
108            sc.getAuthorizedReadDests().clear();
109            sc.getAuthorizedWriteDests().clear();
110        }
111    }
112}