美文网首页程序员SpringBoot极简教程 · Spring Boot Java编程
CAS单点登录系列之极速入门与实战教程(4.2.7)

CAS单点登录系列之极速入门与实战教程(4.2.7)

作者: smileNicky | 来源:发表于2020-04-12 11:46 被阅读0次

    @[toc]

    一、 SSO简介

    1.1 单点登录定义

    单点登录(Single sign on),英文名称缩写SSO,SSO的意思就是在多系统的环境中,登录单方系统,就可以在不用再次登录的情况下访问相关受信任的系统。也就是说只要登录一次单体系统就可以。

    1.2 单点登录角色

    单点登录一般包括下面三种角色:

    ①用户(多个);

    ②认证中心(一个);

    ③Web应用(多个)。

    PS:这里所说的web应用可以理解为SSO Client,认证中心可以说是SSO Server。

    1.3 单点登录分类

    因为http协议是无状态的协议,所以要保持登录状态,必须要存储登录信息,按照存储方式,单点登录实现方式主要可以分为两种。

    • 一种是基于Cookie的,这种比较常见,比如下文介绍的CAS也是基于Cookie的;
    • 另外一种是基于Session的,其实理解起来就是会话共享,只有实现不同子系统之间的会话共享就能实现单点登录,详情可以参考我之前的博客,就是实现会话共享实现单点登录的,https://blog.csdn.net/u014427391/article/details/78653482

    二、 CAS简介

    2.1 CAS简单定义

    CAS(Center Authentication Service)是耶鲁大学研究的一款开源的单点登录项目,主要为web项目提供单点登录实现,属于Web SSO

    2.2 CAS体系结构

    CAS体系结构分为CAS Server和CAS Client。

    CAS Server就是Cas开源的,需要去github下载,然后进行修改;Cas Client
    可以是App或者web端的或者PC端,CAS支持多种开发语言,java、php、C#等等

    这里写图片描述

    PS:图来自官网,这里简单介绍一下,从图可以看出,CAS支持多种方式的认证,一种是LDAP的、比较常见的数据库Database的JDBC,还有Active Directory等等;支持的协议有Custom Protocol 、 CAS 、 OAuth 、 OpenID 、 RESTful API 、 SAML1.1 、 SAML2.0 等

    2.3 CAS原理

    下面给出一张来自CAS官方的图片


    这里写图片描述

    CAS登录等系统分为CAS Server和CAS Client,下面,我根据我的理解稍微解释一下:

    1、用户访问CAS Client请求资源

    2、客户端程序做了重定向,重定向到CAS Server

    3、CAS Server会对请求做认证,验证是否有TGC(Ticket Granted Cookie,有TGC说明已经登录过,不需要再登录,没有就返回登录页面

    4、认证通过后会生成一个Service Ticket返回Cas Client,客户端进行Ticket缓存,一般放在Cookie里,我们称之为TGC(Ticket Granted Cookie)

    5、然后Cas Client就带着Ticket再次访问Cas Server,CAS Server进行Ticket验证

    6、CAS Server对Ticket进行验证,通过就返回用户信息,用户拿到信息后就可以登录

    看到这个过程,我们大概就能理解CAS是怎么实现的,看起来过程挺多的,不过这些过程都是CAS在后台做的。CAS Service和CAS Client通讯基于HttpUrlConnection

    注意要点:

    • TGT(Ticket Granded Ticket),就是存储认证凭据的Cookie,有TGT说明已经通过认证
    • ST(Service Ticket),是由CAS认证中心生成的一个唯一的不可伪装的票据,用于认证的
    • 没登录过的或者TGT失效的,访问时候也跳转到认证中心,发现没有TGT,说明没有通过认证,直接重定向登录页面,输入账号密码后,再次重定向到认证中心,验证通过后,生成ST,返回客户端保存到TGC
    • 登录过的而且TGT没有失效的,直接带着去认证中心认证,认证中心发现有TGT,重定向到客户端,并且带上ST,客户端再带ST去认证中心验证

    三、CAS服务端搭建

    3.1 CAS支持Http登录配置

    CAS默认是要https的链接才能登录的,不过学习的话是可以先驱动https限制,本博客介绍的是基于Cas4.2.7的,之前改过4.0的,详情见https://blog.csdn.net/u014427391/article/details/82083995

    Cas4.2.7和4.0的修改是不一样的,Cas4.2.7版本需要自己编译,是基于Gradle的,不是基于Maven的,觉得麻烦可以下载4.0,因为4.0版本有提供war包,不需要自己编译,下面介绍一下4.2.7版本,怎么支持http登录

    需要修改cas4.2.7的cas-server-webapp/WEB-INF/cas.properties,全都改为非安全的

    tgc.secure=false
    warn.cookie.secure=false
    

    cas-server-webapp/resources/service/HTTPSandIMAPS-10000001.json原来的

    "serviceId" : "^(https|imaps)://.*"
    

    加上http

    "serviceId" : "^(https|imaps|http)://.*"
    

    注释cas-server-webapp/WEB-INF/view/jsp/default/ui/casLoginView.jsp页面中校验是否是HTTPS协议的标签块

    <c:if test="${not pageContext.request.secure}">
        <div id="msg" class="errors">
            <h2><spring:message code="screen.nonsecure.title" /></h2>
            <p><spring:message code="screen.nonsecure.message" /></p>
        </div>
    </c:if>
    

    然后登录就没非安全提示了

    3.2 CAS服务端部署运行

    然后将war包丢在Tomcat的webapp里,部署启动,默认账号密码casuser/Mellon,cas4.2.7的账号密码是写在cas.properties里的,这个和4.0的不一样

    accept.authn.users=casuser::Mellon
    
    
    单点登录

    登录成功,当然在项目中,肯定不能这样做,这个需要我们配置jdbc或者加上权限校验等等

    在这里插入图片描述
    单点登出,链接是http://127.0.0.1:8080/cas/logout
    在这里插入图片描述

    四、CAS客户端接入

    本博客介绍一下基于SpringBoot的Cas客户端接入,数据库采用mysql,权限控制采用Shiro

    maven配置,加上Shiro和CAS的相关jar:

    CAS和Shiro的相关版本

    <properties>
            <shiro.version>1.2.3</shiro.version>
            <shiro.spring.version>1.2.4</shiro.spring.version>
            <shiro.encache.version>1.2.4</shiro.encache.version>
            <cas.version>3.2.0</cas.version>
            <shiro.cas.version>1.2.4</shiro.cas.version>
        </properties>
    

    加上Shiro和cas相关jar

     <!-- Shiro -->
            <dependency>
                <groupId>org.apache.shiro</groupId>
                <artifactId>shiro-spring</artifactId>
                <version>${shiro.spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.shiro</groupId>
                <artifactId>shiro-ehcache</artifactId>
                <version>${shiro.encache.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.shiro</groupId>
                <artifactId>shiro-cas</artifactId>
                <version>${shiro.cas.version}</version>
            </dependency>
    
            <!-- cas -->
            <dependency>
                <groupId>org.jasig.cas.client</groupId>
                <artifactId>cas-client-core</artifactId>
                <version>${cas.version}</version>
            </dependency>
    

    新建一个环境类,保存cas的一些配置链接:

    package org.muses.jeeplatform.core;
    
    /**
     * <pre>
     *  CAS配置环境类
     * </pre>
     *
     * @author nicky.ma
     * <pre>
     * 修改记录
     *    修改后版本:     修改人:  修改日期: 2019年05月25日  修改内容:
     * </pre>
     */
    public class CASConsts {
    
        /* CAS单点登录配置 */
        //Cas server地址
        public static final String CAS_SERVER_URL_PREFIX = "http://localhost:8080/cas";
        //Cas单点登录地址
        public static final String CAS_LOGIN_URL = CAS_SERVER_URL_PREFIX +"/login";
        //CAS单点登出地址
        public static final String CAS_LOGOUT_URL = CAS_SERVER_URL_PREFIX + "/logout";
        //对外提供的服务地址
        public static final String SERVER_URL_PREFIX = "http://localhost:8081";
        //Cas过滤器的urlPattern
        public static final String CAS_FILTER_URL_PATTERN = "/jeeplatform";
        //CAS客户端单点登录跳转地址
        public static final String CAS_CLIENT_LOGIN_URL = CAS_LOGIN_URL + "?service="+SERVER_URL_PREFIX+CAS_FILTER_URL_PATTERN;
        //CAS客户端单点登出
        public static final String CAS_CLIENT_LOGOUT_URL = CAS_LOGOUT_URL + "?service="+SERVER_URL_PREFIX+CAS_FILTER_URL_PATTERN;
        //登录成功地址
        public static final String LOGIN_SUCCESS_URL = "/index";
        //无权访问页面403
        public static final String LOGIN_UNAUTHORIZED_URL = "/403";
    
    }
    
    

    ShiroCas配置类:

    package org.muses.jeeplatform.config;
    
    import org.apache.shiro.cas.CasFilter;
    import org.apache.shiro.cas.CasSubjectFactory;
    import org.apache.shiro.mgt.SecurityManager;
    import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
    import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
    import org.jasig.cas.client.authentication.AuthenticationFilter;
    import org.jasig.cas.client.session.SingleSignOutFilter;
    import org.jasig.cas.client.session.SingleSignOutHttpSessionListener;
    import org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter;
    import org.muses.jeeplatform.core.shiro.ShiroRealm;
    import org.muses.jeeplatform.web.filter.SysAccessControllerFilter;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.boot.web.servlet.FilterRegistrationBean;
    import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    import javax.servlet.Filter;
    import java.util.HashMap;
    import java.util.LinkedHashMap;
    import java.util.Map;
    
    import static org.muses.jeeplatform.core.CASConsts.*;
    
    /**
     * @author nicky.ma
     */
    @Configuration
    public class ShiroConfig {
    
        private static final Logger LOG = LoggerFactory.getLogger(ShiroConfig.class);
    
        /**
         *  单点登出监听器
         * @return
         */
        @Bean
        public ServletListenerRegistrationBean singleSignOutHttpSeessionListener(){
            ServletListenerRegistrationBean bean = new ServletListenerRegistrationBean();
            bean.setListener(new SingleSignOutHttpSessionListener());
            bean.setEnabled(true);
            return bean;
        }
    
        /**
         * 注册单点登出的过滤器
         * @return
         */
        @Bean
        public FilterRegistrationBean singleSignOutFilter(){
            FilterRegistrationBean bean = new FilterRegistrationBean();
            bean.setName("singleSignOutFilter");
            bean.setFilter(new SingleSignOutFilter());
            bean.addUrlPatterns("/*");
            bean.setEnabled(true);
            return bean;
        }
    
        @Bean
        public FilterRegistrationBean authenticationFilter(){
            FilterRegistrationBean bean = new FilterRegistrationBean();
            bean.setFilter(new AuthenticationFilter());
            bean.addUrlPatterns("/*");
            bean.setName("CAS AuthenticationFilter");
            bean.addInitParameter("casServerLoginUrl",CAS_SERVER_URL_PREFIX);
            bean.addInitParameter("serverName",SERVER_URL_PREFIX);
            return bean;
        }
    
        /**
         * 单点登录校验
         * @return
         */
        @Bean
        public FilterRegistrationBean validationFilter(){
            FilterRegistrationBean registrationBean = new FilterRegistrationBean();
            registrationBean.setFilter(new Cas20ProxyReceivingTicketValidationFilter());
            registrationBean.addUrlPatterns("/*");
            registrationBean.setName("CAS Validation Filter");
            registrationBean.addInitParameter("casServerUrlPrefix", CAS_SERVER_URL_PREFIX );
            registrationBean.addInitParameter("serverName", SERVER_URL_PREFIX );
            return registrationBean;
        }
    
    
        /**
         * CAS过滤器
         * @return
         */
        @Bean
        public CasFilter getCasFilter(){
            CasFilter casFilter = new CasFilter();
            casFilter.setName("casFilter");
            casFilter.setEnabled(true);
            casFilter.setFailureUrl(CAS_CLIENT_LOGIN_URL);
            casFilter.setSuccessUrl(LOGIN_SUCCESS_URL);
            return casFilter;
        }
    
        /**
         * 定义ShrioRealm
         * @return
         */
        @Bean
        public ShiroRealm myShiroRealm(){
            ShiroRealm myShiroRealm = new ShiroRealm();
            return myShiroRealm;
        }
    
        /**
         * Shiro Security Manager
         * @return
         */
        @Bean
        public SecurityManager securityManager(){
            DefaultWebSecurityManager securityManager =  new DefaultWebSecurityManager();
            //securityManager.setRealm(myShiroRealm());
            securityManager.setSubjectFactory(new CasSubjectFactory());
            return securityManager;
        }
    
        /**
         * ShiroFilterFactoryBean
         * @param securityManager
         * @return
         */
        @Bean
        public ShiroFilterFactoryBean shirFilter(SecurityManager securityManager,CasFilter casFilter) {
            ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
            //注册Shrio Security Manager
            shiroFilterFactoryBean.setSecurityManager(securityManager);
    
            shiroFilterFactoryBean.setLoginUrl(CAS_CLIENT_LOGIN_URL);
            shiroFilterFactoryBean.setSuccessUrl(LOGIN_SUCCESS_URL);
            shiroFilterFactoryBean.setUnauthorizedUrl(LOGIN_UNAUTHORIZED_URL);
    
            //添加CasFilter到ShiroFilter
            Map<String,Filter> filters = new HashMap<String,Filter>();
            filters.put("casFilter",casFilter);
            shiroFilterFactoryBean.setFilters(filters);
    
            //拦截器.
            Map<String,String> filterChainDefinitionMap = new LinkedHashMap<>();
            //Shiro集成CAS后需要添加该规则
            filterChainDefinitionMap.put(CAS_FILTER_URL_PATTERN,"casFilter");
            // 配置不会被拦截的链接 顺序判断
            filterChainDefinitionMap.put("/static/**", "anon");
            filterChainDefinitionMap.put("/upload/**", "anon");
            filterChainDefinitionMap.put("/plugins/**", "anon");
            filterChainDefinitionMap.put("/code", "anon");
            //filterChainDefinitionMap.put("/login", "anon");
            filterChainDefinitionMap.put("/403", "anon");
            //filterChainDefinitionMap.put("/logincheck", "anon");
            filterChainDefinitionMap.put("/logout","anon");
            filterChainDefinitionMap.put("/**", "authc");
            shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
    
            return shiroFilterFactoryBean;
        }
    
       
    }
    
    

    自定义的CasRealm:

    package org.muses.jeeplatform.core.shiro;
    
    import org.apache.shiro.authc.*;
    import org.apache.shiro.authz.AuthorizationInfo;
    import org.apache.shiro.authz.SimpleAuthorizationInfo;
    import org.apache.shiro.cas.CasRealm;
    import org.apache.shiro.realm.AuthorizingRealm;
    import org.apache.shiro.subject.PrincipalCollection;
    import org.muses.jeeplatform.core.entity.admin.User;
    import org.muses.jeeplatform.service.UserService;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import javax.annotation.PostConstruct;
    import javax.annotation.Resource;
    
    import static org.muses.jeeplatform.core.CASConsts.CAS_FILTER_URL_PATTERN;
    import static org.muses.jeeplatform.core.CASConsts.CAS_SERVER_URL_PREFIX;
    
    /**
     * @description 基于Shiro框架的权限安全认证和授权
     * @author Nicky
     * @date 2017年3月12日
     */
    public class ShiroRealm extends CasRealm {
    
        Logger LOG = LoggerFactory.getLogger(ShiroRealm.class);
    
        /**注解引入业务类**/
        @Resource
        UserService userService;
    
        @PostConstruct
        public void initProperty(){
            setCasServerUrlPrefix(CAS_SERVER_URL_PREFIX);
            //客户端回调地址
            setCasService(CAS_SERVER_URL_PREFIX + CAS_FILTER_URL_PATTERN);
        }
        
        /**
         * 登录信息和用户验证信息验证(non-Javadoc)
         * @see org.apache.shiro.realm.AuthenticatingRealm#doGetAuthenticationInfo(AuthenticationToken)
         */
        @Override
        protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
    
            if(LOG.isInfoEnabled()) {
                LOG.info("=>执行Shiro权限认证");
            }
    
            String username = (String)token.getPrincipal();                 //得到用户名
            String password = new String((char[])token.getCredentials());   //得到密码
             
            User user = userService.findByUsername(username);
    
            /* 检测是否有此用户 */
            if(user == null){
                throw new UnknownAccountException();//没有找到账号异常
            }
            /* 检验账号是否被锁定 */
            if(Boolean.TRUE.equals(user.getLocked())){
                throw new LockedAccountException();//抛出账号锁定异常
            }
            /* AuthenticatingRealm使用CredentialsMatcher进行密码匹配*/
            if(null != username && null != password){
                return new SimpleAuthenticationInfo(username, password, getName());
            }else{
                 return null;
            }
    
        }
        
        /**
         * 授权查询回调函数, 进行鉴权但缓存中无用户的授权信息时调用,负责在应用程序中决定用户的访问控制的方法(non-Javadoc)
         * @see AuthorizingRealm#doGetAuthorizationInfo(PrincipalCollection)
         */
        @Override
        protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection pc) {
            if(LOG.isInfoEnabled()) {
                LOG.info("=>执行Shiro授权");
            }
            String username = (String)pc.getPrimaryPrincipal();
            SimpleAuthorizationInfo authorizationInfo = new SimpleAuthorizationInfo();
            authorizationInfo.setRoles(userService.getRoles(username));
            authorizationInfo.setStringPermissions(userService.getPermissions(username));
            return authorizationInfo;
        }
        
         @Override
         public void clearCachedAuthorizationInfo(PrincipalCollection principals) {
             super.clearCachedAuthorizationInfo(principals);
         }
    
         @Override
         public void clearCachedAuthenticationInfo(PrincipalCollection principals) {
             super.clearCachedAuthenticationInfo(principals);
         }
    
         @Override
         public void clearCache(PrincipalCollection principals) {
              super.clearCache(principals);
         }
    
    }
    
    

    五、客户端极速接入

    上面例子是比较麻烦的,我们要接入客户端可以常用第三方的starter lib来对接

     <!-- CAS依赖包 -->
            <dependency>
                <groupId>net.unicon.cas</groupId>
                <artifactId>cas-client-autoconfig-support</artifactId>
                <version>1.5.0-GA</version>
            </dependency>
    

    yaml配置:

    cas:
      server-login-url: http://127.0.0.1:8080/cas/login
      server-url-prefix: http://127.0.0.1:8080/cas
      client-host-url: http://127.0.0.1:8081
      validation-type: cas
    #  use-session: true
    

    加个Springboot配置类:

    package org.muses.jeeplatform.config;
    
    import net.unicon.cas.client.configuration.CasClientConfigurerAdapter;
    import net.unicon.cas.client.configuration.EnableCasClient;
    import org.jasig.cas.client.authentication.AuthenticationFilter;
    import org.springframework.boot.web.servlet.FilterRegistrationBean;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    import java.util.HashMap;
    import java.util.Map;
    
    @Configuration
    @EnableCasClient
    public class CASConfig extends CasClientConfigurerAdapter {
    
        private static final String CAS_SERVER_URL_LOGIN = "http://localhost:8080/cas/login";
        private static final String SERVER_NAME = "http://localhost:8081/";
    
    
    //    @Override
    //    public void configureAuthenticationFilter(FilterRegistrationBean authenticationFilter) {
    //        super.configureAuthenticationFilter(authenticationFilter);
    //        //authenticationFilter.getInitParameters().put("authenticationRedirectStrategyClass","com.test.CustomAuthRedirectStrategy");
    //    }
    
        @Bean
        public FilterRegistrationBean filterRegistrationBean(){
            FilterRegistrationBean registrationBean = new FilterRegistrationBean();
            registrationBean.setFilter(new AuthenticationFilter());
            registrationBean.addUrlPatterns("/*");
            Map<String, String> initParameters = new HashMap<String,String>(16);
            initParameters.put("casServerLoginUrl",CAS_SERVER_URL_LOGIN);
            initParameters.put("serverName",SERVER_NAME);
            initParameters.put("ignorePattern","/logoutSuccess/*");
            registrationBean.setOrder(1);
            return registrationBean;
        }
    
    
    }
    
    

    相关文章

      网友评论

        本文标题:CAS单点登录系列之极速入门与实战教程(4.2.7)

        本文链接:https://www.haomeiwen.com/subject/bfevmhtx.html