cas单点登出

由于项目需求要实现单点登出需要在网上找了N久终于实现单点登出。

使用cas-server-core-3.3.3.jar（CAS Server 3.3.3）

使用cas-client-core-3.1.3.jar（CAS Client 3.1.3）

 

项目结合CAS SpringSecurity SSH

 

普通项目（没有结合Spring Security）的可以在web.xml中加入如下代码

 

<filter>
   <filter-name>CAS Single Sign Out Filter</filter-name>
   <filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
</filter>

<filter-mapping>
   <filter-name>CAS Single Sign Out Filter</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>

<listener>
    <listener-class>
       org.jasig.cas.client.session.SingleSignOutHttpSessionListener
    </listener-class>
</listener>

 

 

在我们的项目中由于结合了SpringSecurity 可以将filter加入到spring Security过滤链中，也可以直接向上面的一样加入web.xml中

首先在web.xml中加入监听器。

 

<!-- single sign out -->
<listener>
      <listener-class>
          org.jasig.cas.client.session.SingleSignOutHttpSessionListener
      </listener-class>
</listener>
<!-- single sign out -->

 

然后把filter加入到spring Security过滤链中

 

 

<!-- single sign out -->
<b:bean id="casSingleSignOutFilter" class="check.SingleSignOutFilter">
    <custom-filter before="CAS_PROCESSING_FILTER"/>
</b:bean>
<!-- single sign out -->

 

注意上面的class="check.SingleSignOutFilter"是我自定义的filter（由于CAS3.1.3定义的SingleSignOutFilter在某种意思上没有起到作用）详情请见http://www.javaeye.com/topic/546785

自己定义一个类

 

package check;

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jasig.cas.client.session.HashMapBackedSessionMappingStorage;
import org.jasig.cas.client.session.SessionMappingStorage;
import org.jasig.cas.client.util.AbstractConfigurationFilter;
import org.jasig.cas.client.util.CommonUtils;
import org.jasig.cas.client.util.XmlUtils;

public final class SingleSignOutFilter extends AbstractConfigurationFilter
{
  private String artifactParameterName;
  private static SessionMappingStorage SESSION_MAPPING_STORAGE = new HashMapBackedSessionMappingStorage();
  private static Log log = LogFactory.getLog(SingleSignOutFilter.class);

  public SingleSignOutFilter()
  {
    this.artifactParameterName = "ticket";
  }

  public void init(FilterConfig filterConfig)
    throws ServletException
  {
    setArtifactParameterName(getPropertyFromInitParams(filterConfig, "artifactParameterName", "ticket"));
    init();
  }

  public void init() {
    CommonUtils.assertNotNull(this.artifactParameterName, "artifactParameterName cannot be null.");
    CommonUtils.assertNotNull(SESSION_MAPPING_STORAGE, "sessionMappingStorage cannote be null.");
  }

  public void setArtifactParameterName(String artifactParameterName) {
    this.artifactParameterName = artifactParameterName;
  }

  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    final HttpServletRequest request = (HttpServletRequest) servletRequest;
    final String logoutRequest = CommonUtils.safeGetParameter(request, "logoutRequest");
    Enumeration ff = request.getParameterNames();
    String a = request.getQueryString();
    if (CommonUtils.isNotBlank(logoutRequest)) {
         final String sessionIdentifier = XmlUtils.getTextForElement(logoutRequest, "SessionIndex");

         if (CommonUtils.isNotBlank(sessionIdentifier)) {
            final HttpSession session = SESSION_MAPPING_STORAGE.removeSessionByMappingId(sessionIdentifier);

            if (session != null) {
                 String sessionID = session.getId();
                 try {
                    session.invalidate();
                 } catch (final IllegalStateException e) {

                 }
            }
         }
     }

    else{
        final String artifact = CommonUtils.safeGetParameter(request, this.artifactParameterName);
        final HttpSession session = request.getSession(false);

        if (CommonUtils.isNotBlank(artifact) && session!=null) {
            try {
                SESSION_MAPPING_STORAGE.removeBySessionById(session.getId());
            } catch (final Exception e) {

            }
            SESSION_MAPPING_STORAGE.addSessionById(artifact, session);
        }
    }

    filterChain.doFilter(servletRequest, servletResponse);
  }

  public void setSessionMappingStorage(SessionMappingStorage storage) {
    SESSION_MAPPING_STORAGE = storage;
  }

  public static SessionMappingStorage getSessionMappingStorage() {
    return SESSION_MAPPING_STORAGE;
  }

  public void destroy()
  {
  }
}

完成。

这样即可实现单点登出。（所有java应用的单点退出）

1）这样实现的效果是在登出的时候CAS Server 分发给各个客户端让各个客户端都登出，这个得让FIlter来获取，例子：一个index页面有两个链接一个指向java应用，一个指向php应用在 java应用加filter 后能做出相应的动作退出动作，而对于php自己没加任何filter就没有退出。所以也得写个filter。

 

 

2）由于我们点击退出的时候请求CAS Server 而后Server分发任务让每个应用退出的消息，java程序通过filter来执行退出。PHP提供了一个phpCAS::handleLogoutRequests()来检验服务器发来的信息，

具体我们可以把这个代码放在phpbb3/include/function.php中的点击事件里面代码如下：

 

if(!$admin && CAS_ENABLE){
    // initialize phpCAS
    phpCAS::client(CAS_VERSION_2_0, CAS_SERVER_HOSTNAME, CAS_SERVER_PORT, CAS_SERVER_APP_NAME);
    phpCAS::setNoCasServerValidation();
    // force CAS authentication
    phpCAS::handleLogoutRequests();//加的去看看有没有服务器端发出注销消息。
    phpCAS::forceAuthentication();