Fork me on GitHub

CAS单点登录系列之极速入门与实战教程(4.2.7)

@

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,链接

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;
    }


}

posted @ 2020-04-12 11:46  smileNicky  阅读(2207)  评论(0编辑  收藏  举报