/*
* Copyright 2010 the original author or authors.
*
* Licensed 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.springframework.security.authentication.jaas;
import java.io.IOException;
import java.security.Principal;
import java.util.*;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.context.ApplicationListener;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.authentication.jaas.event.JaasAuthenticationFailedEvent;
import org.springframework.security.authentication.jaas.event.JaasAuthenticationSuccessEvent;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.session.SessionDestroyedEvent;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
/**
* An {@link AuthenticationProvider} implementation that retrieves user details from a JAAS login configuration.
*
* <p>This <code>AuthenticationProvider</code> is capable of validating {@link
* org.springframework.security.authentication.UsernamePasswordAuthenticationToken} requests contain the correct username and
* password.</p>
* <p>This implementation is backed by a <a
* href="http://java.sun.com/j2se/1.5.0/docs/guide/security/jaas/JAASRefGuide.html">JAAS</a> configuration that is provided by
* a subclass's implementation of {@link #createLoginContext(CallbackHandler)}.
*
* <p>When using JAAS login modules as the authentication source, sometimes the
* <a href="http://java.sun.com/j2se/1.5.0/docs/api/javax/security/auth/login/LoginContext.html">LoginContext</a> will
* require <i>CallbackHandler</i>s. The AbstractJaasAuthenticationProvider uses an internal
* <a href="http://java.sun.com/j2se/1.5.0/docs/api/javax/security/auth/callback/CallbackHandler.html">CallbackHandler
* </a> to wrap the {@link JaasAuthenticationCallbackHandler}s configured in the ApplicationContext.
* When the LoginContext calls the internal CallbackHandler, control is passed to each
* {@link JaasAuthenticationCallbackHandler} for each Callback passed.
* </p>
* <p>{@link JaasAuthenticationCallbackHandler}s are passed to the AbstractJaasAuthenticationProvider through the {@link
* #setCallbackHandlers(org.springframework.security.authentication.jaas.JaasAuthenticationCallbackHandler[]) callbackHandlers}
* property.
* <pre>
* <property name="callbackHandlers">
* <list>
* <bean class="org.springframework.security.authentication.jaas.TestCallbackHandler"/>
* <bean class="{@link JaasNameCallbackHandler org.springframework.security.authentication.jaas.JaasNameCallbackHandler}"/>
* <bean class="{@link JaasPasswordCallbackHandler org.springframework.security.authentication.jaas.JaasPasswordCallbackHandler}"/>
* </list>
* </property>
* </pre>
* </p>
* <p>
* After calling LoginContext.login(), the AbstractJaasAuthenticationProvider will retrieve the returned Principals
* from the Subject (LoginContext.getSubject().getPrincipals). Each returned principal is then passed to the
* configured {@link AuthorityGranter}s. An AuthorityGranter is a mapping between a returned Principal, and a role
* name. If an AuthorityGranter wishes to grant an Authorization a role, it returns that role name from it's {@link
* AuthorityGranter#grant(java.security.Principal)} method. The returned role will be applied to the Authorization
* object as a {@link GrantedAuthority}.</p>
* <p>AuthorityGranters are configured in spring xml as follows...
* <pre>
* <property name="authorityGranters">
* <list>
* <bean class="org.springframework.security.authentication.jaas.TestAuthorityGranter"/>
* </list>
* </property>
* </pre>
*
* @author Ray Krueger
* @author Rob Winch
*/
public abstract class AbstractJaasAuthenticationProvider implements AuthenticationProvider,
ApplicationEventPublisherAware, InitializingBean, ApplicationListener<SessionDestroyedEvent> {
//~ Instance fields ================================================================================================
private ApplicationEventPublisher applicationEventPublisher;
private AuthorityGranter[] authorityGranters;
private JaasAuthenticationCallbackHandler[] callbackHandlers;
protected final Log log = LogFactory.getLog(getClass());
private LoginExceptionResolver loginExceptionResolver = new DefaultLoginExceptionResolver();
private String loginContextName = "SPRINGSECURITY";
//~ Methods ========================================================================================================
/**
* Validates the required properties are set. In addition, if
* {@link #setCallbackHandlers(JaasAuthenticationCallbackHandler[])} has not
* been called with valid handlers, initializes to use
* {@link JaasNameCallbackHandler} and {@link JaasPasswordCallbackHandler}.
*/
public void afterPropertiesSet() throws Exception {
Assert.hasLength(loginContextName, "loginContextName cannot be null or empty");
Assert.notEmpty(authorityGranters, "authorityGranters cannot be null or empty");
if (ObjectUtils.isEmpty(callbackHandlers)) {
setCallbackHandlers(new JaasAuthenticationCallbackHandler[] { new JaasNameCallbackHandler(),
new JaasPasswordCallbackHandler() });
}
Assert.notNull(loginExceptionResolver, "loginExceptionResolver cannot be null");
}
/**
* Attempts to login the user given the Authentication objects principal and credential
*
* @param auth The Authentication object to be authenticated.
*
* @return The authenticated Authentication object, with it's grantedAuthorities set.
*
* @throws AuthenticationException This implementation does not handle 'locked' or 'disabled' accounts. This method
* only throws a AuthenticationServiceException, with the message of the LoginException that will be
* thrown, should the loginContext.login() method fail.
*/
public Authentication authenticate(Authentication auth) throws AuthenticationException {
if (!(auth instanceof UsernamePasswordAuthenticationToken)) {
return null;
}
UsernamePasswordAuthenticationToken request = (UsernamePasswordAuthenticationToken) auth;
Set<GrantedAuthority> authorities;
try {
// Create the LoginContext object, and pass our InternallCallbackHandler
LoginContext loginContext = createLoginContext(new InternalCallbackHandler(auth));
// Attempt to login the user, the LoginContext will call our InternalCallbackHandler at this point.
loginContext.login();
// Create a set to hold the authorities, and add any that have already been applied.
authorities = new HashSet<GrantedAuthority>();
// Get the subject principals and pass them to each of the AuthorityGranters
Set<Principal> principals = loginContext.getSubject().getPrincipals();
for (Principal principal : principals) {
for (AuthorityGranter granter : authorityGranters) {
Set<String> roles = granter.grant(principal);
// If the granter doesn't wish to grant any authorities, it should return null.
if ((roles != null) && !roles.isEmpty()) {
for (String role : roles) {
authorities.add(new JaasGrantedAuthority(role, principal));
}
}
}
}
//Convert the authorities set back to an array and apply it to the token.
JaasAuthenticationToken result = new JaasAuthenticationToken(request.getPrincipal(),
request.getCredentials(), new ArrayList<GrantedAuthority>(authorities), loginContext);
//Publish the success event
publishSuccessEvent(result);
//we're done, return the token.
return result;
} catch (LoginException loginException) {
AuthenticationException ase = loginExceptionResolver.resolveException(loginException);
publishFailureEvent(request, ase);
throw ase;
}
}
/**
* Creates the LoginContext to be used for authentication.
*
* @param handler The CallbackHandler that should be used for the LoginContext (never <code>null</code>).
* @return the LoginContext to use for authentication.
* @throws LoginException
*/
protected abstract LoginContext createLoginContext(CallbackHandler handler) throws LoginException;
/**
* Handles the logout by getting the security contexts for the destroyed session and invoking
* {@code LoginContext.logout()} for any which contain a {@code JaasAuthenticationToken}.
*
*
* @param event the session event which contains the current session
*/
protected void handleLogout(SessionDestroyedEvent event) {
List<SecurityContext> contexts = event.getSecurityContexts();
if (contexts.isEmpty()) {
log.debug("The destroyed session has no SecurityContexts");
return;
}
for(SecurityContext context : contexts) {
Authentication auth = context.getAuthentication();
if ((auth != null) && (auth instanceof JaasAuthenticationToken)) {
JaasAuthenticationToken token = (JaasAuthenticationToken) auth;
try {
LoginContext loginContext = token.getLoginContext();
boolean debug = log.isDebugEnabled();
if (loginContext != null) {
if (debug) {
log.debug("Logging principal: [" + token.getPrincipal() + "] out of LoginContext");
}
loginContext.logout();
} else if (debug) {
log.debug("Cannot logout principal: [" + token.getPrincipal() + "] from LoginContext. "
+ "The LoginContext is unavailable");
}
} catch (LoginException e) {
log.warn("Error error logging out of LoginContext", e);
}
}
}
}
public void onApplicationEvent(SessionDestroyedEvent event) {
handleLogout(event);
}
/**
* Publishes the {@link JaasAuthenticationFailedEvent}. Can be overridden by subclasses for different
* functionality
*
* @param token The authentication token being processed
* @param ase The excetion that caused the authentication failure
*/
protected void publishFailureEvent(UsernamePasswordAuthenticationToken token, AuthenticationException ase) {
if (applicationEventPublisher != null) {
applicationEventPublisher.publishEvent(new JaasAuthenticationFailedEvent(token, ase));
}
}
/**
* Publishes the {@link JaasAuthenticationSuccessEvent}. Can be overridden by subclasses for different
* functionality.
*
* @param token The token being processed
*/
protected void publishSuccessEvent(UsernamePasswordAuthenticationToken token) {
if (applicationEventPublisher != null) {
applicationEventPublisher.publishEvent(new JaasAuthenticationSuccessEvent(token));
}
}
/**
* Returns the AuthorityGrannter array that was passed to the {@link
* #setAuthorityGranters(AuthorityGranter[])} method, or null if it none were ever set.
*
* @return The AuthorityGranter array, or null
*
* @see #setAuthorityGranters(AuthorityGranter[])
*/
AuthorityGranter[] getAuthorityGranters() {
return authorityGranters;
}
/**
* Set the AuthorityGranters that should be consulted for role names to be granted to the Authentication.
*
* @param authorityGranters AuthorityGranter array
*
* @see JaasAuthenticationProvider
*/
public void setAuthorityGranters(AuthorityGranter[] authorityGranters) {
this.authorityGranters = authorityGranters;
}
/**
* Returns the current JaasAuthenticationCallbackHandler array, or null if none are set.
*
* @return the JAASAuthenticationCallbackHandlers.
*
* @see #setCallbackHandlers(JaasAuthenticationCallbackHandler[])
*/
JaasAuthenticationCallbackHandler[] getCallbackHandlers() {
return callbackHandlers;
}
/**
* Set the JAASAuthentcationCallbackHandler array to handle callback objects generated by the
* LoginContext.login method.
*
* @param callbackHandlers Array of JAASAuthenticationCallbackHandlers
*/
public void setCallbackHandlers(JaasAuthenticationCallbackHandler[] callbackHandlers) {
this.callbackHandlers = callbackHandlers;
}
String getLoginContextName() {
return loginContextName;
}
/**
* Set the loginContextName, this name is used as the index to the configuration specified in the
* loginConfig property.
*
* @param loginContextName
*/
public void setLoginContextName(String loginContextName) {
this.loginContextName = loginContextName;
}
LoginExceptionResolver getLoginExceptionResolver() {
return loginExceptionResolver;
}
public void setLoginExceptionResolver(LoginExceptionResolver loginExceptionResolver) {
this.loginExceptionResolver = loginExceptionResolver;
}
public boolean supports(Class<?> aClass) {
return UsernamePasswordAuthenticationToken.class.isAssignableFrom(aClass);
}
public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
this.applicationEventPublisher = applicationEventPublisher;
}
protected ApplicationEventPublisher getApplicationEventPublisher() {
return applicationEventPublisher;
}
//~ Inner Classes ==================================================================================================
/**
* Wrapper class for JAASAuthenticationCallbackHandlers
*/
private class InternalCallbackHandler implements CallbackHandler {
private final Authentication authentication;
public InternalCallbackHandler(Authentication authentication) {
this.authentication = authentication;
}
public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
for (JaasAuthenticationCallbackHandler handler : callbackHandlers) {
for (Callback callback : callbacks) {
handler.handle(callback, authentication);
}
}
}
}
}