content: /**
   * 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.Set;
  
  import javax.security.auth.Subject;
  import javax.security.auth.login.LoginContext;
  
  import org.apache.activemq.broker.Broker;
  import org.apache.activemq.broker.ConnectionContext;
  import org.apache.activemq.command.ConnectionInfo;
  import org.apache.activemq.jaas.JassCredentialCallbackHandler;
  
  /**
   * Logs a user in using JAAS.
   *
   *
   */
  public class JaasAuthenticationBroker extends AbstractAuthenticationBroker {
  
      private final String jassConfiguration;
  
      public JaasAuthenticationBroker(Broker next, String jassConfiguration) {
          super(next);
          this.jassConfiguration = jassConfiguration;
      }
  
      static class JaasSecurityContext extends SecurityContext {
  
          private final Subject subject;
  
          public JaasSecurityContext(String userName, Subject subject) {
              super(userName);
              this.subject = subject;
          }
  
          @Override
          public Set<Principal> getPrincipals() {
              return subject.getPrincipals();
          }
      }
  
      @Override
      public void addConnection(ConnectionContext context, ConnectionInfo info) throws Exception {
          if (context.getSecurityContext() == null) {
              // 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());
              SecurityContext securityContext = null;
              try {
                  securityContext = authenticate(info.getUserName(), info.getPassword(), null);
                  context.setSecurityContext(securityContext);
                  securityContexts.add(securityContext);
                  super.addConnection(context, info);
              } catch (Exception error) {
                  if (securityContext != null) {
                      securityContexts.remove(securityContext);
                  }
                  context.setSecurityContext(null);
                  throw error;
              } finally {
                  Thread.currentThread().setContextClassLoader(original);
              }
          } else {
              super.addConnection(context, info);
          }
      }
  
      @Override
      public SecurityContext authenticate(String username, String password, X509Certificate[] certificates) throws SecurityException {
          SecurityContext result = null;
          JassCredentialCallbackHandler callback = new JassCredentialCallbackHandler(username, password);
          try {
              LoginContext lc = new LoginContext(jassConfiguration, callback);
              lc.login();
              Subject subject = lc.getSubject();
  
              result = new JaasSecurityContext(username, subject);
          } catch (Exception ex) {
              throw new SecurityException("User name [" + username + "] or password is invalid.", ex);
          }
  
          return result;
      }
  }
  