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.jaas;
  
  import java.io.IOException;
  import java.security.Principal;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Set;
  
  import javax.security.auth.Subject;
  import javax.security.auth.callback.Callback;
  import javax.security.auth.callback.CallbackHandler;
  import javax.security.auth.callback.NameCallback;
  import javax.security.auth.callback.PasswordCallback;
  import javax.security.auth.callback.UnsupportedCallbackException;
  import javax.security.auth.login.FailedLoginException;
  import javax.security.auth.login.LoginException;
  import javax.security.auth.spi.LoginModule;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class PropertiesLoginModule extends PropertiesLoader implements LoginModule {
  
      private static final String USER_FILE_PROP_NAME = "org.apache.activemq.jaas.properties.user";
      private static final String GROUP_FILE_PROP_NAME = "org.apache.activemq.jaas.properties.group";
  
      private static final Logger LOG = LoggerFactory.getLogger(PropertiesLoginModule.class);
  
      private Subject subject;
      private CallbackHandler callbackHandler;
  
      private Properties users;
      private Map<String,Set<String>> groups;
      private String user;
      private final Set<Principal> principals = new HashSet<Principal>();
  
      /** the authentication status*/
      private boolean succeeded = false;
      private boolean commitSucceeded = false;
  
      @Override
      public void initialize(Subject subject, CallbackHandler callbackHandler, Map sharedState, Map options) {
          this.subject = subject;
          this.callbackHandler = callbackHandler;
          succeeded = false;
          init(options);
          users = load(USER_FILE_PROP_NAME, "user", options).getProps();
          groups = load(GROUP_FILE_PROP_NAME, "group", options).invertedPropertiesValuesMap();
      }
  
      @Override
      public boolean login() throws LoginException {
          Callback[] callbacks = new Callback[2];
  
          callbacks[0] = new NameCallback("Username: ");
          callbacks[1] = new PasswordCallback("Password: ", false);
          try {
              callbackHandler.handle(callbacks);
          } catch (IOException ioe) {
              throw new LoginException(ioe.getMessage());
          } catch (UnsupportedCallbackException uce) {
              throw new LoginException(uce.getMessage() + " not available to obtain information from user");
          }
          user = ((NameCallback) callbacks[0]).getName();
          char[] tmpPassword = ((PasswordCallback) callbacks[1]).getPassword();
          if (tmpPassword == null) {
              tmpPassword = new char[0];
          }
          if (user == null) {
              throw new FailedLoginException("user name is null");
          }
          String password = users.getProperty(user);
  
          if (password == null) {
              throw new FailedLoginException("User does exist");
          }
          if (!password.equals(new String(tmpPassword))) {
              throw new FailedLoginException("Password does not match");
          }
          succeeded = true;
  
          if (debug) {
              LOG.debug("login " + user);
          }
          return succeeded;
      }
  
      @Override
      public boolean commit() throws LoginException {
          if (!succeeded) {
              clear();
              if (debug) {
                  LOG.debug("commit, result: false");
              }
              return false;
          }
  
          principals.add(new UserPrincipal(user));
  
          Set<String> matchedGroups = groups.get(user);
          if (matchedGroups != null) {
              for (String entry : matchedGroups) {
                  principals.add(new GroupPrincipal(entry));
              }
          }
  
          subject.getPrincipals().addAll(principals);
  
          if (debug) {
              LOG.debug("commit, result: true");
          }
  
          commitSucceeded = true;
          return true;
      }
  
      @Override
      public boolean abort() throws LoginException {
          if (debug) {
              LOG.debug("abort");
          }
          if (!succeeded) {
              return false;
          } else if (succeeded && commitSucceeded) {
              // we succeeded, but another required module failed
              logout();
          } else {
              // our commit failed
              clear();
              succeeded = false;
          }
          return true;
      }
  
      @Override
      public boolean logout() throws LoginException {
          subject.getPrincipals().removeAll(principals);
          clear();
          if (debug) {
              LOG.debug("logout");
          }
  
          succeeded = false;
          commitSucceeded = false;
          return true;
      }
  
      private void clear() {
          user = null;
          principals.clear();
      }
  
  }
  