单点登录实现（spring session+redis完成session共享）

野性酷女 2022-06-02 01:29 172阅读 0赞

## v一、前言 ##

项目中用到的SSO，使用开源框架cas做的。简单的了解了一下cas，并学习了一下 [单点登录的原理][Link 1]，有兴趣的同学也可以学习一下，写个demo玩一玩。

## v二、工程结构 ##

![640632-20170214001857254-1157801404.png][]

我模拟了 sso的客户端和sso的服务端， sso-core中主要是一些sso需要的过滤器和工具类，缓存和session共享的一些XML配置文件，还有springmvc需要的一下jar包的管理。sso-cache中配置了redis缓存策略。

## v三、单点登录原理图 ##

![640632-20170214003010285-574881970.png][]

简单描述：

用户访问系统1的受保护资源，系统1发现用户未登录，跳转至sso认证中心，并将自己的地址作为参数

sso认证中心发现用户未登录，将用户引导至登录页面

用户输入用户名密码提交登录申请

sso认证中心校验用户信息，创建用户与sso认证中心之间的会话，称为全局会话，同时创建授权令牌

sso认证中心带着令牌跳转会最初的请求地址（系统1）

系统1拿到令牌，去sso认证中心校验令牌是否有效

sso认证中心校验令牌，返回有效，注册系统1

系统1使用该令牌创建与用户的会话，称为局部会话，返回受保护资源

用户访问系统2的受保护资源

系统2发现用户未登录，跳转至sso认证中心，并将自己的地址作为参数

sso认证中心发现用户已登录，跳转回系统2的地址，并附上令牌

系统2拿到令牌，去sso认证中心校验令牌是否有效

sso认证中心校验令牌，返回有效，注册系统2

系统2使用该令牌创建与用户的局部会话，返回受保护资源

## v 四、单点登录实现 ##

**1.SSOFilter.java（sso client filter实现）**

import java.io.IOException; import javax.servlet.Filter; 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.HttpServletResponse; import javax.servlet.http.HttpSession; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.alibaba.fastjson.JSONObject; import com.hjz.sso.utils.RestTemplateUtil; public class SSOFilter implements Filter{ public static Logger logger = LoggerFactory.getLogger(SSOFilter.class); private String SSO_SERVER_URL; private String SSO_SERVER_VERIFY_URL; @Override public void init(FilterConfig filterConfig) throws ServletException { SSO_SERVER_URL = filterConfig.getInitParameter("SSO_SERVER_URL"); SSO_SERVER_VERIFY_URL = filterConfig.getInitParameter("SSO_SERVER_VERIFY_URL"); if(SSO_SERVER_URL == null) logger.error("SSO_SERVER_URL is null."); if(SSO_SERVER_VERIFY_URL == null) logger.error("SSO_SERVER_VERIFY_URL is null."); } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) req; HttpServletResponse response = (HttpServletResponse) res; //请求中带有token，去sso-server验证token是否有效 String authority = null; if(request.getParameter("token") != null) { boolean verifyResult = this.verify(request, SSO_SERVER_VERIFY_URL, request.getParameter("token")); if (verifyResult) { chain.doFilter(req, res); return; } else { authority = "token->" + request.getParameter("token") + " is invalidate."; } } HttpSession session = request.getSession(); if (session.getAttribute("login") != null && (boolean)session.getAttribute("login") == true) { chain.doFilter(req, res); return; } //跳转至sso认证中心 String callbackURL = request.getRequestURL().toString(); StringBuilder url = new StringBuilder(); url.append(SSO_SERVER_URL).append("?callbackURL=").append(callbackURL); if(authority != null) { url.append("&authority=").append(authority); } response.sendRedirect(url.toString()); } private boolean verify(HttpServletRequest request, String verifyUrl, String token) { String result = RestTemplateUtil.get(request, verifyUrl + "?token=" + token, null); JSONObject ret = JSONObject.parseObject(result); if("success".equals(ret.getString("code"))) { return true; } logger.error(request.getRequestURL().toString() + " : " + ret.getString("msg")); return false; } @Override public void destroy() { } }

**2.LoginController.java（sso server登录controller）**

import java.util.UUID; import javax.servlet.http.HttpSession; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; @Controller @RequestMapping("sso") public class LoginController { private Logger logger = LoggerFactory.getLogger(LoginController.class); @RequestMapping(value="login", method={RequestMethod.GET, RequestMethod.POST}) public String login(HttpSession session, Model model, @RequestParam(value="name", required=false) String name, @RequestParam(value="password", required=false) String password) { if(name == null && password == null) return "login"; if("admin".equals(name) && "admin".equals(password)) { String token = UUID.randomUUID().toString(); session.setAttribute("login", true); session.setAttribute("token", token); return "index"; } else { model.addAttribute("error", true); model.addAttribute("message", "用户名或密码错误。"); return "login"; } } }

**3.ValidateController.java（sso server验证token controller）**

import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import com.alibaba.fastjson.JSONObject; @Controller @RequestMapping("sso") public class ValidateController { @RequestMapping("verify") @ResponseBody public JSONObject verify(HttpServletRequest request, @RequestParam String token) { HttpSession session = request.getSession(); JSONObject result = new JSONObject(); if(session.getAttribute("token") != null && token.equals(session.getAttribute("token"))) { result.put("code", "success"); result.put("msg", "认证成功"); } else { result.put("code", "failure"); result.put("msg", "token已失效，请重新登录！"); } return result; } }

**4.在sso client工程中加上SSOFilter（web.xml部分配置）**

<filter> <filter-name>ssoFilter</filter-name> <filter-class>com.hjz.sso.filter.SSOFilter</filter-class> <init-param> <param-name>SSO_SERVER_URL</param-name> <param-value>http://localhost:8088/sso-server/sso/login</param-value> </init-param> <init-param> <param-name>SSO_SERVER_VERIFY_URL</param-name> <param-value>http://localhost:8088/sso-server/sso/verify</param-value> </init-param> </filter> <filter-mapping> <filter-name>ssoFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

基本模型已经出来了，启动sso-client 和 sso-server（本人都部署到了同一个tomcat下），试图去验证单点登录。测试的时候，从浏览器中的cookie中查看，可以看到 localhost域下有多个JSESSIONID。这也难怪， Tomcat中的每一个application都会创建自己的session会话。那接下来的事情就是解决 session 共享的问题，这样我们就可以完成我们的单点登陆了。

为完成 session共享，这里推荐两种方案。一个是 [tomcat+redis实现session共享][tomcat_redis_session]，一个是 [spring session+redis实现session共享][spring session_redis_session]。我这里采用了第二种方案，详情请接着看下面的步骤。

**5.为每个工程的web.xml中增加spring session代理filter的配置**

<filter> <filter-name>springSessionRepositoryFilter</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> </filter> <filter-mapping> <filter-name>springSessionRepositoryFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

**6.在sso-core中加入 缓存和spring session的xml配置（cache-config.xml）**

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd" default-lazy-init="false"> <description>Cache公共配置</description> <bean id="cookieSerializer" class="org.springframework.session.web.http.DefaultCookieSerializer"> <property name="cookiePath" value="/"></property> </bean> <bean class="com.sso.cache.config.CacheConfig"/> <bean class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration"> <property name="maxInactiveIntervalInSeconds" value="1800"></property> </bean> </beans>

**这里说一下为什么有定义一个 cookieSerializer 这个bean。参看RedisHttpSessionConfiguration的源码，发现它继承了SpringHttpSessionConfiguration，继续查看源码，发现SpringHttpSessionConfiguration中实现了我们配置的spring session代理filter，如下所示。**

SpringHttpSessionConfiguration.java @Bean public <S extends ExpiringSession> SessionRepositoryFilter<? extends ExpiringSession> springSessionRepositoryFilter( SessionRepository<S> sessionRepository) { SessionRepositoryFilter sessionRepositoryFilter = new SessionRepositoryFilter(sessionRepository); sessionRepositoryFilter.setServletContext(this.servletContext); if (this.httpSessionStrategy instanceof MultiHttpSessionStrategy) { sessionRepositoryFilter.setHttpSessionStrategy((MultiHttpSessionStrategy) this.httpSessionStrategy); } else { sessionRepositoryFilter.setHttpSessionStrategy(this.httpSessionStrategy); } return sessionRepositoryFilter; }

**　查看源码，可以发现 SpringHttpSessionConfiguration使用的默认会话策略（httpSessionStrategy）是CookieHttpSessionStrategy。继续查看CookieHttpSessionStrategy的源码，如新建session写入cookie。**

public void onNewSession(Session session, HttpServletRequest request, HttpServletResponse response) { Set sessionIdsWritten = getSessionIdsWritten(request); if (sessionIdsWritten.contains(session.getId())) { return; } sessionIdsWritten.add(session.getId()); Map sessionIds = getSessionIds(request); String sessionAlias = getCurrentSessionAlias(request); sessionIds.put(sessionAlias, session.getId()); String cookieValue = createSessionCookieValue(sessionIds); this.cookieSerializer.writeCookieValue(new CookieSerializer.CookieValue(request, response, cookieValue)); }

**cookieSerializer 默认是 DefaultCookieSerializer。查看DefaultCookieSerializer 的 writeCookieValue方法如下。**

public void writeCookieValue(CookieSerializer.CookieValue cookieValue) { HttpServletRequest request = cookieValue.getRequest(); HttpServletResponse response = cookieValue.getResponse(); String requestedCookieValue = cookieValue.getCookieValue(); String actualCookieValue = requestedCookieValue + this.jvmRoute; Cookie sessionCookie = new Cookie(this.cookieName, actualCookieValue); sessionCookie.setSecure(isSecureCookie(request)); sessionCookie.setPath(getCookiePath(request)); String domainName = getDomainName(request); if (domainName != null) { sessionCookie.setDomain(domainName); } if (this.useHttpOnlyCookie) { sessionCookie.setHttpOnly(true); } if ("".equals(requestedCookieValue)) { sessionCookie.setMaxAge(0); } else { sessionCookie.setMaxAge(this.cookieMaxAge); } response.addCookie(sessionCookie); }

**sessionCookie.setPath(getCookiePath(request));这块有一个问题，看一下getCookiePath方法的实现，如下。**

private String getCookiePath(HttpServletRequest request) { if (this.cookiePath == null) { return request.getContextPath() + "/"; } return this.cookiePath; }

**如果要实现单点登录，就不要使用默认的 cookiePath 的值。所以，我定义了一个 cookieSerializer 的bean，并指定了 cookiePath 的值。 SpringHttpSessionConfiguration中如下方法可以自动装配 我们配置的cookieSerializer，而不是使用默认的。**

@Autowired(required = false) public void setCookieSerializer(CookieSerializer cookieSerializer) { this.defaultHttpSessionStrategy.setCookieSerializer(cookieSerializer); }

**7.在每个工程中的spring公共配置文件中增加如下配置。**

**8.后端之间rest请求传递 session ID。**

private static ResponseEntity<String> request(ServletRequest req, String url, HttpMethod method, Map<String, ?> params) { HttpServletRequest request = (HttpServletRequest) req; //获取header信息 HttpHeaders requestHeaders = new HttpHeaders(); Enumeration<String> headerNames = request.getHeaderNames(); while (headerNames.hasMoreElements()) { String key = (String) headerNames.nextElement(); String value = request.getHeader(key); requestHeaders.add(key, value); } HttpEntity<String> requestEntity = new HttpEntity<String>(params != null ? JSONObject.toJSONString(params) : null, requestHeaders); ResponseEntity<String> rss = restTemplate.exchange(url, method, requestEntity, String.class); return rss; }

使用RestTemplate发送rest请求，发送之前复制request中的header信息，保证session ID可以传递。

**9.最后，启动工程，测试结果如下。**

![640632-20170214175201035-561491751.gif][]

http://localhost:8000/sso-client-user/　　和　　http://localhost:8000/sso-client-org/ 切换访问工程。

转载至：https://www.cnblogs.com/hujunzheng/p/6395966.html?from=singlemessage

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[Link 1]: http://mp.weixin.qq.com/s?__biz=MjM5NzMyMjAwMA==&mid=2651477916&idx=1&sn=de4e5626f0a10507b692bcaf343cf570&chksm=bd253be38a52b2f5502ec743af0be57613b31591133b6a8fd74e9a115eba48c1a8b3ba4fbd7e&mpshare=1&scene=23&srcid=1216GMbxoxpAYML2YAzh7SsV#rd
[640632-20170214001857254-1157801404.png]: /images/20220602/ad6ec6b073b749dfa778aa0a1308b67f.png
[640632-20170214003010285-574881970.png]: /images/20220602/5598e71cb16349a48dfaeeba1e5565fd.png
[tomcat_redis_session]: http://blog.csdn.net/qq584852076/article/details/46502185
[spring session_redis_session]: http://blog.csdn.net/psy1100/article/details/51276085
[640632-20170214175201035-561491751.gif]: /images/20220602/4531696f89d84e2984afb3df5609718a.png
[20171225154508004]: /images/20220602/ff2c7169688241c5b0bf71df8b5d0c8c.png