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Posted to slide-dev@jakarta.apache.org by oz...@apache.org on 2004/01/23 09:14:53 UTC

cvs commit: jakarta-slide/proposals/jaas/org/apache/slide/jaas/spi SlideLoginModule.java SlideRole.java SlidePrincipal.java SlideGroup.java

ozeigermann    2004/01/23 00:14:53

  Added:       proposals/jaas/org/apache/slide/jaas/spi
                        SlideLoginModule.java SlideRole.java
                        SlidePrincipal.java SlideGroup.java
  Log:
  Added JAAS authentication contribution by Unico Hommes
  
  Revision  Changes    Path
  1.1                  jakarta-slide/proposals/jaas/org/apache/slide/jaas/spi/SlideLoginModule.java
  
  Index: SlideLoginModule.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-slide/proposals/jaas/org/apache/slide/jaas/spi/SlideLoginModule.java,v 1.1 2004/01/23 08:14:52 ozeigermann Exp $
   * $Revision: 1.1 $
   * $Date: 2004/01/23 08:14:52 $
   *
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999-2004 The Apache Software Foundation.  All rights 
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer. 
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:  
   *       "This product includes software developed by the 
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Slide", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written 
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * [Additional notices, if required by prior licensing conditions]
   *
   */
  package org.apache.slide.jaas.spi;
  
  import java.io.IOException;
  import java.security.Principal;
  import java.security.acl.Group;
  import java.util.ArrayList;
  import java.util.Enumeration;
  import java.util.Map;
  
  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.LoginException;
  import javax.security.auth.spi.LoginModule;
  
  import org.apache.slide.authenticate.CredentialsToken;
  import org.apache.slide.authenticate.SecurityToken;
  import org.apache.slide.common.Domain;
  import org.apache.slide.common.NamespaceAccessToken;
  import org.apache.slide.common.SlideException;
  import org.apache.slide.common.SlideToken;
  import org.apache.slide.common.SlideTokenImpl;
  import org.apache.slide.content.Content;
  import org.apache.slide.content.NodeProperty;
  import org.apache.slide.content.NodeRevisionDescriptor;
  import org.apache.slide.content.NodeRevisionDescriptors;
  import org.apache.slide.security.ACLSecurityImpl;
  import org.apache.slide.security.Security;
  import org.apache.slide.structure.ObjectNotFoundException;
  import org.apache.slide.structure.SubjectNode;
  
  /**
   * JAAS LoginModule for authenticating against users in a Slide namespace.
   * 
   * <p>
   *  The implementation assumes the ACLSecurityImpl is used.
   * </p>
   * 
   * Options include (to be specified in JAAS login configuration file):
   * <ul>
   *  <li><code>namespace</code>: the namespace to load users from.
   *  Defaults to the default namespace from the Slide domain configuration.
   *  </li>
   * </ul>
   * 
   * @author <a href="mailto:unico@apache.org">Unico Hommes</a>
   */
  public class SlideLoginModule implements LoginModule {
      
      // Slide helpers
      private Content m_content;
      private Security m_security;
      
      // Slide configuration
      private String m_usersPath;
      private String m_rolesPath;
      
      // authentication state information
      private boolean m_authenticated = false;
      private Subject m_subject;
      private Principal m_principal;
      private Principal[] m_roles;
      private Group m_group;
      
      private boolean m_committed = false;
      
      private CallbackHandler m_callbackHandler;
      private Map m_sharedState;
  
  
      public SlideLoginModule() {
      }
  
      /**
       * Initialize this <code>LoginModule</code> with the specified
       * configuration information.
       *
       * @param subject The <code>Subject</code> to be authenticated
       * @param callbackHandler A <code>CallbackHandler</code> for communicating
       *        with the end user as necessary
       * @param sharedState State information shared with other
       *        <code>LoginModule</code> instances
       * @param options Configuration information for this specific
       *        <code>LoginModule</code> instance
       */
      public void initialize(
          Subject subject,
          CallbackHandler callbackHandler,
          Map sharedState,
          Map options) {
          
          m_subject = subject;
          m_callbackHandler = callbackHandler;
          m_sharedState = sharedState;
          
          // namespace option
          String namespace = (String) options.get("namespace");
          if (namespace == null) {
              namespace = Domain.getDefaultNamespace();
          }
          
          // access the namespace
          NamespaceAccessToken nat = Domain.accessNamespace(new SecurityToken(this),namespace);
          m_content = nat.getContentHelper();
          m_security = nat.getSecurityHelper();
          m_usersPath = nat.getNamespaceConfig().getUsersPath();
          m_rolesPath = nat.getNamespaceConfig().getRolesPath();
      }
  
      /**
       * Phase 1 of authenticating a <code>Subject</code>.
       *
       * @return <code>true</code> if the authentication succeeded, or
       *         <code>false</code> if this <code>LoginModule</code> should be ignored
       *
       * @exception LoginException if the authentication fails
       */
      public boolean login() throws LoginException {
  
          if (m_callbackHandler == null) {
              throw new LoginException ("No callback handler");
          }
          Callback[] callbacks = new Callback[2];
          callbacks[0] = new NameCallback("Username: ");
          callbacks[1] = new PasswordCallback("Password: ",false);
  
          try {
              // prompt for username and password
              m_callbackHandler.handle(callbacks);
  
              String username = ((NameCallback) callbacks[0]).getName();
              char[] password = ((PasswordCallback) callbacks[1]).getPassword();
  
              if (username == null) {
                  throw new LoginException("No user name entered");
              }
              if (password == null) {
                  throw new LoginException("No password entered");
              }
              
              // share username and password with other LoginModules
              m_sharedState.put("javax.security.auth.login.name",username);
              m_sharedState.put("javax.security.auth.login.password",password);
              
              // use the users own credentials to retrieve its info
              SlideToken slideToken = new SlideTokenImpl(new CredentialsToken(username));
              
              // retrieve user object
              SubjectNode userNode;
              try {
                  userNode = (SubjectNode) m_security.getPrincipal(slideToken);
              }
              catch (ObjectNotFoundException e) {
                  final String msg = "No such user";
                  if (Domain.isDebugEnabled()) {
                      Domain.debug("[SlideLoginModule] - " + msg);
                  }
                  throw new LoginException(msg);
              }
              catch (SlideException e) {
                  final String msg = "Failure loading user object";
                  Domain.error("[SlideLoginModule] - " + msg,e);
                  throw new LoginException(msg);
              }
              
              m_principal = new SlidePrincipal(username);
              m_group = new SlideGroup();
  
              NodeRevisionDescriptors revisions = m_content.retrieve(slideToken, m_usersPath + "/" + username);
              NodeRevisionDescriptor revision = m_content.retrieve(slideToken, revisions);
  
              // get the password property
              NodeProperty property = revision.getProperty("password", NodeProperty.SLIDE_NAMESPACE);
              if (property != null) {
                  m_authenticated = new String(password).equals(property.getValue());
                  
                  if (!m_authenticated) {
                      final String msg = "Authentication failed";
                      if (Domain.isDebugEnabled()) {
                          Domain.debug("[SlideLoginModule] - " + msg + " for user " + username 
                              + ": wrong password.");
                      }
                      throw new LoginException(msg);
                  }
                  else if (Domain.isDebugEnabled()) {
                      Domain.debug("[SlideLoginModule] - user " + username 
                          + " successfully authenticated");
                  }
                  
                  // find the roles the user is a member of
                  ArrayList list = new ArrayList();
                  Enumeration roles = ((ACLSecurityImpl) m_security).
                      getGroupMembership(slideToken, userNode);
                  while (roles.hasMoreElements()) {
                      String role = ((String) roles.nextElement()).substring(m_rolesPath.length()+1);
                      if (Domain.isDebugEnabled()) {
                          Domain.debug("[SlideLoginModule] - adding role " + role 
                              + " for user " + username);
                      }
                      SlideRole slideRole = new SlideRole(role);
                      // apparently Jetty and Tomcat expect the roles to be 
                      // at different locations:
                      // the Group is to satisfy Jetty, the list is to satisfy Tomcat
                      m_group.addMember(slideRole);
                      list.add(slideRole);
                  }
                  m_roles = (Principal[]) list.toArray(new Principal[list.size()]);
                  return true;
              }
              else {
                  final String msg = "User " + username + " doesn't have his password " +
                      "property set: can't authenticate.";
                  Domain.warn("[SlideLoginModule] - " + msg);
                  throw new LoginException(msg);
              }
          }
          catch (IOException e) {
              final String msg = "Failure during login()";
              Domain.error("[SlideLoginModule] - " + msg,e);
              throw new LoginException(msg);
          }
          catch (UnsupportedCallbackException e) {
              final String msg = "Failure during login()";
              Domain.error("[SlideLoginModule] - " + msg,e);
              throw new LoginException(msg);
          }
          catch (SlideException e) {
              final String msg = "Failure during login()";
              Domain.error("[SlideLoginModule] - " + msg,e);
              throw new LoginException(msg);
          }
      }
  
      /**
       * Phase 2 of authenticating a <code>Subject</code> when Phase 1
       * was successful.  This method is called if the <code>LoginContext</code>
       * succeeded in the overall authentication chain.
       *
       * @return <code>true</code> if the authentication succeeded, or
       *         <code>false</code> if this <code>LoginModule</code> should be ignored
       *
       * @exception LoginException if the commit fails
       */
      public boolean commit() throws LoginException {
          if (m_authenticated) {
              m_subject.getPrincipals().add(m_principal);
              m_subject.getPrincipals().add(m_group);
              for (int i = 0; i < m_roles.length; i++) {
                  m_subject.getPrincipals().add(m_roles[i]);
              }
          }
          m_committed = true;
          return m_authenticated;
      }
  
      /**
       * Phase 2 of authenticating a <code>Subject</code> when Phase 1
       * fails.  This method is called if the <code>LoginContext</code>
       * failed somewhere in the overall authentication chain.
       *
       * @return <code>true</code> if this method succeeded, or
       *         <code>false</code> if this <code>LoginModule</code> should be ignored
       *
       * @exception LoginException if the abort fails
       */
      public boolean abort() throws LoginException {
          m_principal = null;
          m_group = null;
          return m_authenticated;
      }
  
      /**
       * Log out this user.
       *
       * @return <code>true</code> in all cases because this
       *         <code>LoginModule</code> should not be ignored.
       *
       * @exception LoginException if logging out failed
       */
      public boolean logout() throws LoginException {
          m_subject.getPrincipals().remove(m_principal);
          m_subject.getPrincipals().remove(m_group);
          m_committed = false;
          m_principal = null;
          m_group = null;
          return true;
      }
      
  }
  
  
  
  1.1                  jakarta-slide/proposals/jaas/org/apache/slide/jaas/spi/SlideRole.java
  
  Index: SlideRole.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-slide/proposals/jaas/org/apache/slide/jaas/spi/SlideRole.java,v 1.1 2004/01/23 08:14:52 ozeigermann Exp $
   * $Revision: 1.1 $
   * $Date: 2004/01/23 08:14:52 $
   *
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999-2004 The Apache Software Foundation.  All rights 
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer. 
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:  
   *       "This product includes software developed by the 
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Slide", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written 
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * [Additional notices, if required by prior licensing conditions]
   *
   */
  package org.apache.slide.jaas.spi;
  
  
  public final class SlideRole extends SlidePrincipal {
      
      public SlideRole(String name) {
          super(name);
      }
  
  }
  
  
  
  1.1                  jakarta-slide/proposals/jaas/org/apache/slide/jaas/spi/SlidePrincipal.java
  
  Index: SlidePrincipal.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-slide/proposals/jaas/org/apache/slide/jaas/spi/SlidePrincipal.java,v 1.1 2004/01/23 08:14:52 ozeigermann Exp $
   * $Revision: 1.1 $
   * $Date: 2004/01/23 08:14:52 $
   *
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999-2004 The Apache Software Foundation.  All rights 
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer. 
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:  
   *       "This product includes software developed by the 
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Slide", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written 
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * [Additional notices, if required by prior licensing conditions]
   *
   */
  package org.apache.slide.jaas.spi;
  
  import java.security.Principal;
  
  
  public class SlidePrincipal implements Principal {
      
      private final String m_name;
      
      public SlidePrincipal(String name) {
          m_name = name;
      }
      
      public String getName() {
          return m_name;
      }
      
      public int hashCode() {
          return getName().hashCode();
      }
      
      public String toString() {
          return getName();
      }
      
      public boolean equals(SlidePrincipal principal) {
          return principal.getName().equals(getName());
      }
      
  }
  
  
  
  1.1                  jakarta-slide/proposals/jaas/org/apache/slide/jaas/spi/SlideGroup.java
  
  Index: SlideGroup.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-slide/proposals/jaas/org/apache/slide/jaas/spi/SlideGroup.java,v 1.1 2004/01/23 08:14:52 ozeigermann Exp $
   * $Revision: 1.1 $
   * $Date: 2004/01/23 08:14:52 $
   *
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999-2004 The Apache Software Foundation.  All rights 
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer. 
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:  
   *       "This product includes software developed by the 
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Slide", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written 
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * [Additional notices, if required by prior licensing conditions]
   *
   */
  package org.apache.slide.jaas.spi;
  
  import java.security.Principal;
  import java.security.acl.Group;
  import java.util.Enumeration;
  import java.util.HashSet;
  import java.util.Iterator;
  
  
  public final class SlideGroup implements Group {
      
      private final HashSet m_members = new HashSet();
      
      public boolean addMember(Principal user) {
          return m_members.add(user);
      }
      
      public boolean isMember(Principal member) {
          return m_members.contains(member);
      }
      
      public Enumeration members() {
          class MembersEnumeration implements Enumeration {
              private Iterator m_iter;
              public MembersEnumeration(Iterator iter) {
                  m_iter = iter;
              }
              public boolean hasMoreElements () {
                  return m_iter.hasNext();
              }
              public Object nextElement () {
                  return m_iter.next();
              }
          }
  
          return new MembersEnumeration(m_members.iterator());
      }
  
      public boolean removeMember(Principal user) {
          return m_members.remove(user);
      }
      
      public String getName() {
          return "roles";
      }
  
  }
  
  
  

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