文章目录
前言
一、CAS是什么？
二、搭建客户端系统
引入CAS
客户端后端搭建
总结
前言
什么是单点登录？单点登录全称Single Sign On（以下简称SSO），是指在多系统应用群中登录一个系统，便可在其他所有系统中得到授权而无需再次登录，包括单点登录与单点注销两部分，如图(不标准，只是方便理解)。
一、CAS是什么？
CAS 是 Yale 大学发起的一个开源项目，旨在为 Web 应用系统提供一种可靠的单点登录方法，CAS 在 2004 年 12 月正式成为 JA-SIG 的一个项目。CAS 具有以下特点：
开源的企业级单点登录解决方案。
CAS Server 为需要独立部署的 Web 应用。
CAS Client 支持非常多的客户端(这里指单点登录系统中的各个 Web 应用)，包括 Java, .Net, PHP, Perl, Apache, uPortal, Ruby 等。
二、搭建客户端系统
1.引入CAS
参考：https://www.bilibili.com/video/BV1xy4y1r7BU?t=666&p=8
注意其中将证书导入jdk中，一定要注意精确到cacerts这个文件下，不然一直报拒绝写入，另外最好用管理员下的命令窗口
2.客户端后端搭建
1.添加依赖
<dependency>
<groupId>org.jasig.cas.client</groupId>
<artifactId>cas-client-core</artifactId>
<version>3.3.2</version>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.10.5</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-cas</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-taglibs</artifactId>
</dependency>2.配置客户端
server:
port: 12343.添加config(filter)文件
地址全为ip,如果用hosts映射地址，可能会出现问题
package com.casclient1.cas.config;
import org.jasig.cas.client.session.SingleSignOutFilter;
import org.jasig.cas.client.util.HttpServletRequestWrapperFilter;
import org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.web.filter.CharacterEncodingFilter;
import javax.servlet.Filter;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
@Configuration
public class FilterConfig implements Serializable, InitializingBean {
private static final Logger LOGGER = LoggerFactory.getLogger(FilterConfig.class);
public static final String CAS_SIGNOUT_FILTER_NAME = "CAS Single Sign Out Filter";
public static final String CAS_AUTH_FILTER_NAME = "CAS Filter";
public static final String CAS_IGNOREL_SSL_FILTER_NAME = "CAS Ignore SSL Filter";
public static final String CAS_FILTER_NAME = "CAS Validation Filter";
public static final String CAS_WRAPPER_NAME = "CAS HttpServletRequest Wrapper Filter";
public static final String CAS_ASSERTION_NAME = "CAS Assertion Thread Local Filter";
public static final String CHARACTER_ENCODING_NAME = "Character encoding Filter";
//CAS服务器退出地址
private static String casSigntouServerUrlPrefix = "https://127.0.0.1:8443/cas/logout";
//CAS服务器登录地址
private static String casServerLoginUrl = "https://127.0.0.1:8443/cas/login";
//客户端地址
private static String clienthosturl="http://127.0.0.1:1234";
//CAS服务器地址
private static String casValidationServerUrlPrefix = "https://127.0.0.1:8443/cas";
public FilterConfig() {
}
/**
* 单点登出功能,放在其他filter之前
* casSigntouServerUrlPrefix为登出前缀:https://123.207.122.156:8081/cas/logout
*
* @return
*/
@Bean
@Order(0)
public FilterRegistrationBean getCasSignoutFilterRegistrationBean() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(getCasSignoutFilter());
registration.addUrlPatterns("/*", "*.html");
registration.addInitParameter("casServerUrlPrefix", casSigntouServerUrlPrefix);
registration.setName(CAS_SIGNOUT_FILTER_NAME);
registration.setEnabled(true);
return registration;
}
@Bean(name = CAS_SIGNOUT_FILTER_NAME)
public Filter getCasSignoutFilter() {
return new SingleSignOutFilter();
}
/**
* 忽略SSL认证
*
* @return
*/
@Bean
@Order(1)
public FilterRegistrationBean getCasSkipSSLValidationFilterRegistrationBean() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(getCasSkipSSLValidationFilter());
registration.addUrlPatterns("/*", "*.html");
registration.setName(CAS_IGNOREL_SSL_FILTER_NAME);
registration.setEnabled(true);
return registration;
}
@Bean(name = CAS_IGNOREL_SSL_FILTER_NAME)
public Filter getCasSkipSSLValidationFilter() {
return new IgnoreSSLValidateFilter();
}
/**
* 负责用户的认证
* casServerLoginUrl：https://123.207.122.156:8081/cas/login
* casServerName：https://123.207.122.156:8080/tdw/alerts/
*
* @return
*/
@Bean
@Order(2)
public FilterRegistrationBean getCasAuthFilterRegistrationBean() {
FilterRegistrationBean registration = new FilterRegistrationBean();
final Filter casAuthFilter = getCasAuthFilter();
registration.setFilter(casAuthFilter);
registration.addUrlPatterns("/*", "*.html");
registration.addInitParameter("casServerLoginUrl", casServerLoginUrl);
registration.addInitParameter("serverName", clienthosturl);
registration.setName(CAS_AUTH_FILTER_NAME);
registration.setEnabled(true);
return registration;
}
@Bean(name = CAS_AUTH_FILTER_NAME)
public Filter getCasAuthFilter() {
return new MyAuthenticationFilter();
}
/**
* 对Ticket进行校验
* casValidationServerUrlPrefix要用内网ip
* casValidationServerUrlPrefix：https://123.207.122.156:8081/cas
* casServerName：https://123.207.122.156:8080/tdw/alerts/
*
* @return
*/
@Bean
@Order(3)
public FilterRegistrationBean getCasValidationFilterRegistrationBean() {
FilterRegistrationBean registration = new FilterRegistrationBean();
final Filter casValidationFilter = getCasValidationFilter();
registration.setFilter(casValidationFilter);
registration.addUrlPatterns("/*", "*.html");
registration.addInitParameter("casServerUrlPrefix", casValidationServerUrlPrefix);
registration.addInitParameter("serverName", clienthosturl);
registration.setName(CAS_FILTER_NAME);
registration.setEnabled(true);
return registration;
}
@Bean(name = CAS_FILTER_NAME)
public Filter getCasValidationFilter() {
return new Cas20ProxyReceivingTicketValidationFilter();
}
/**
* 设置response的默认编码方式：UTF-8。
*
* @return
*/
@Bean
@Order(4)
public FilterRegistrationBean getCharacterEncodingFilterRegistrationBean() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(getCharacterEncodingFilter());
registration.addUrlPatterns("/*", "*.html");
registration.setName(CHARACTER_ENCODING_NAME);
registration.setEnabled(true);
return registration;
}
@Bean(name = CHARACTER_ENCODING_NAME)
public Filter getCharacterEncodingFilter() {
CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
characterEncodingFilter.setEncoding("UTF-8");
return characterEncodingFilter;
}
@Bean
public FilterRegistrationBean casHttpServletRequestWrapperFilter(){
FilterRegistrationBean authenticationFilter = new FilterRegistrationBean();
authenticationFilter.setFilter(new HttpServletRequestWrapperFilter());
authenticationFilter.setOrder(6);
List<String> urlPatterns = new ArrayList<>();
urlPatterns.add("/*");
authenticationFilter.setUrlPatterns(urlPatterns);
return authenticationFilter;
}
@Override
public void afterPropertiesSet() throws Exception {
}
}4.filter类中的MyAuthenticationFilter是重写cas jar包中的AuthenticationFilter，原因是CAS源码无法认证直接重定向，而ajax请求又不能直接重定向，导致前端302，而302vue response拦截器是拦截不到的。所以就想到不让cas给我重定向，给我返回状态码，告诉前端认证失败，让前端直接跳转cas服务器登录地址。
修改cas源码过滤器，复制源码AuthenticationFilter这个过滤器，重写他，其实这里只改了重定向的代码其他都一样。上MyAuthenticationFilter代码
package com.casclient1.cas.config;
import org.jasig.cas.client.authentication.*;
import org.jasig.cas.client.util.AbstractCasFilter;
import org.jasig.cas.client.util.CommonUtils;
import org.jasig.cas.client.util.ReflectUtils;
import org.jasig.cas.client.validation.Assertion;
import javax.servlet.FilterConfig;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class MyAuthenticationFilter extends AbstractCasFilter {
private String casServerLoginUrl;
private boolean renew = false;
private boolean gateway = false;
private GatewayResolver gatewayStorage = new DefaultGatewayResolverImpl();
private AuthenticationRedirectStrategy authenticationRedirectStrategy = new DefaultAuthenticationRedirectStrategy();
private UrlPatternMatcherStrategy ignoreUrlPatternMatcherStrategyClass = null;
private static final Map<String, Class<? extends UrlPatternMatcherStrategy>> PATTERN_MATCHER_TYPES = new HashMap();
public MyAuthenticationFilter() {
}
@Override
protected void initInternal(FilterConfig filterConfig) throws ServletException {
if (!this.isIgnoreInitConfiguration()) {
super.initInternal(filterConfig);
this.setCasServerLoginUrl(this.getPropertyFromInitParams(filterConfig, "casServerLoginUrl", (String)null));
this.logger.trace("Loaded CasServerLoginUrl parameter: {}", this.casServerLoginUrl);
this.setRenew(this.parseBoolean(this.getPropertyFromInitParams(filterConfig, "renew", "false")));
this.logger.trace("Loaded renew parameter: {}", this.renew);
this.setGateway(this.parseBoolean(this.getPropertyFromInitParams(filterConfig, "gateway", "false")));
this.logger.trace("Loaded gateway parameter: {}", this.gateway);
String ignorePattern = this.getPropertyFromInitParams(filterConfig, "ignorePattern", (String)null);
this.logger.trace("Loaded ignorePattern parameter: {}", ignorePattern);
String ignoreUrlPatternType = this.getPropertyFromInitParams(filterConfig, "ignoreUrlPatternType", "REGEX");
this.logger.trace("Loaded ignoreUrlPatternType parameter: {}", ignoreUrlPatternType);
if (ignorePattern != null) {
Class<? extends UrlPatternMatcherStrategy> ignoreUrlMatcherClass = (Class)PATTERN_MATCHER_TYPES.get(ignoreUrlPatternType);
if (ignoreUrlMatcherClass != null) {
this.ignoreUrlPatternMatcherStrategyClass = (UrlPatternMatcherStrategy) ReflectUtils.newInstance(ignoreUrlMatcherClass.getName(), new Object[0]);
} else {
try {
this.logger.trace("Assuming {} is a qualified class name...", ignoreUrlPatternType);
this.ignoreUrlPatternMatcherStrategyClass = (UrlPatternMatcherStrategy)ReflectUtils.newInstance(ignoreUrlPatternType, new Object[0]);
} catch (IllegalArgumentException var6) {
this.logger.error("Could not instantiate class [{}]", ignoreUrlPatternType, var6);
}
}
if (this.ignoreUrlPatternMatcherStrategyClass != null) {
this.ignoreUrlPatternMatcherStrategyClass.setPattern(ignorePattern);
}
}
String gatewayStorageClass = this.getPropertyFromInitParams(filterConfig, "gatewayStorageClass", (String)null);
if (gatewayStorageClass != null) {
this.gatewayStorage = (GatewayResolver)ReflectUtils.newInstance(gatewayStorageClass, new Object[0]);
}
String authenticationRedirectStrategyClass = this.getPropertyFromInitParams(filterConfig, "authenticationRedirectStrategyClass", (String)null);
if (authenticationRedirectStrategyClass != null) {
this.authenticationRedirectStrategy = (AuthenticationRedirectStrategy)ReflectUtils.newInstance(authenticationRedirectStrategyClass, new Object[0]);
}
}
}
@Override
public void init() {
super.init();
CommonUtils.assertNotNull(this.casServerLoginUrl, "casServerLoginUrl cannot be null.");
}
@Override
public final void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest)servletRequest;
HttpServletResponse response = (HttpServletResponse)servletResponse;
if (this.isRequestUrlExcluded(request)) {
this.logger.debug("Request is ignored.");
filterChain.doFilter(request, response);
} else {
HttpSession session = request.getSession(false);
Assertion assertion = session != null ? (Assertion)session.getAttribute("_const_cas_assertion_") : null;
if (assertion != null) {
filterChain.doFilter(request, response);
} else {
String serviceUrl = this.constructServiceUrl(request, response);
String ticket = this.retrieveTicketFromRequest(request);
boolean wasGatewayed = this.gateway && this.gatewayStorage.hasGatewayedAlready(request, serviceUrl);
if (!CommonUtils.isNotBlank(ticket) && !wasGatewayed) {
this.logger.debug("no ticket and no assertion found");
String modifiedServiceUrl;
if (this.gateway) {
this.logger.debug("setting gateway attribute in session");
modifiedServiceUrl = this.gatewayStorage.storeGatewayInformation(request, serviceUrl);
} else {
modifiedServiceUrl = serviceUrl;
}
this.logger.debug("Constructed service url: {}", modifiedServiceUrl);
String xRequested =request.getHeader("x-requested-with");
if("XMLHttpRequest".equals(xRequested)){
response.getWriter().write("{\"code\":202, \"msg\":\"no ticket and no assertion found\"}");
}else{
String urlToRedirectTo = CommonUtils.constructRedirectUrl(this.casServerLoginUrl, this.getServiceParameterName(), modifiedServiceUrl, this.renew, this.gateway);
this.logger.debug("redirecting to \"{}\"", urlToRedirectTo);
this.authenticationRedirectStrategy.redirect(request, response, urlToRedirectTo);
}
} else {
filterChain.doFilter(request, response);
}
}
}
}
public final void setRenew(boolean renew) {
this.renew = renew;
}
public final void setGateway(boolean gateway) {
this.gateway = gateway;
}
public final void setCasServerLoginUrl(String casServerLoginUrl) {
this.casServerLoginUrl = casServerLoginUrl;
}
public final void setGatewayStorage(GatewayResolver gatewayStorage) {
this.gatewayStorage = gatewayStorage;
}
private boolean isRequestUrlExcluded(HttpServletRequest request) {
if (this.ignoreUrlPatternMatcherStrategyClass == null) {
return false;
} else {
StringBuffer urlBuffer = request.getRequestURL();
if (request.getQueryString() != null) {
urlBuffer.append("?").append(request.getQueryString());
}
String requestUri = urlBuffer.toString();
return this.ignoreUrlPatternMatcherStrategyClass.matches(requestUri);
}
}
static {
PATTERN_MATCHER_TYPES.put("CONTAINS", ContainsPatternUrlPatternMatcherStrategy.class);
PATTERN_MATCHER_TYPES.put("REGEX", RegexUrlPatternMatcherStrategy.class);
PATTERN_MATCHER_TYPES.put("EXACT", ExactUrlPatternMatcherStrategy.class);
}
}测试Controller
package com.casclient1.cas.controller;
import com.casclient1.cas.domain.UserDomain;
import com.casclient1.cas.tools.Result;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.Console;
import java.io.IOException;
@Controller
public class TestController {
/**
* 测试
* @return
*/
@GetMapping("/test")
@ResponseBody
public Result<UserDomain> login(HttpServletRequest httpServletRequest){
System.out.println("sss");
return new Result<>(new UserDomain(httpServletRequest.getRemoteUser()));
}
@GetMapping("/checkTicket")
public void index(HttpServletResponse response) throws IOException {
// 前端页面地址
response.sendRedirect("http://127.0.0.1:8088/Home");
}
/**
* 注销
* @return
*/
@RequestMapping("/logout")
public String logout(){
return "redirect:https://127.0.0.1:8443/cas/logout";
}
}3.前端
<template xmlns="http://www.w3.org/1999/html">
<div >
<header style="height: 60px">
<span>客户端2验证:{{name}}</span>
<button @click="logout">安全退出</button>
</header>
<router-view></router-view>
<!--
<my-vue v-bind:lineID="lineID"></my-vue>-->
</div>
</template>
<style lang="scss">
</style>
<script type="text/ecmascript-6">
export default {
data() {
return {
name:'ss'
}
},
mounted(){
var _this = this;
this.$http.get('/test', {headers: {'x-requested-with': 'XMLHttpRequest'}})
.then(function (response) {
console.log("sss");
if (response.data.code === 202) {
debugger
console.log("sss");
window.location.href = "http://127.0.0.1:1235/checkTicket"
} else if (response.data.code === 200) {
console.log("sss");
_this.name = response.data.data.name
}
console.log(response);
})
.catch(function (error) {
console.log(error);
});
},
methods: {
logout() {
window.location.href = "http://127.0.0.1:1234/logout"
},
}
}
</script>5.效果
未登录:
点击客户端1超链接
登录成功
点击客户端2超链接，直接进入，无需登录
退出
总结
网上有很多CAS单点登录的demo，但是对于前后端分离讲的比较详细的很少，前后端分离，必定会出现跨域，导致CAS登录无法重定向等等原因，结合和网上一些想法和部门代码后，大致做了一个比较完善，但很基础的单点登录系统，当然单点登录不光有CAS，还有JWT(1.所有服务靠约定来生成token，2.要么集中生成集中判断,所有服务都能生成都认这个，要么一个服务管控全局)，OAuth2等等。
来源：blog.csdn.net/weixin_43483911/article/details/117811270