Spring Security实现禁止用户重复登陆的配置原理

时间:2021-05-20

这篇文章主要介绍了Spring Security实现禁止用户重复登陆的配置原理,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

系统使用了Spring Security做权限管理,现在对于系统的用户,需要改动配置,实现无法多地登陆。

一、SpringMVC项目,配置如下:

首先在修改Security相关的XML,我这里是spring-security.xml,修改UsernamePasswordAuthenticationFilter相关Bean的构造配置

加入

<property name="sessionAuthenticationStrategy" ref="sas" />

新增sas的Bean及其相关配置

<bean id="sas" class="org.springframework.security.web.authentication.session.CompositeSessionAuthenticationStrategy"> <constructor-arg> <list> <bean class="org.springframework.security.web.authentication.session.ConcurrentSessionControlAuthenticationStrategy"> <constructor-arg ref="sessionRegistry"/> <!-- 这里是配置session数量,此处为1,表示同一个用户同时只会有一个session在线 --> <property name="maximumSessions" value="1" /> <property name="exceptionIfMaximumExceeded" value="false" /> </bean> <bean class="org.springframework.security.web.authentication.session.SessionFixationProtectionStrategy"> </bean> <bean class="org.springframework.security.web.authentication.session.RegisterSessionAuthenticationStrategy"> <constructor-arg ref="sessionRegistry"/> </bean> </list> </constructor-arg> </bean> <bean id="sessionRegistry" class="org.springframework.security.core.session.SessionRegistryImpl" />

加入ConcurrentSessionFilter相关Bean配置

<bean id="concurrencyFilter" class="org.springframework.security.web.session.ConcurrentSessionFilter"> <constructor-arg name="sessionRegistry" ref="sessionRegistry" /> <constructor-arg name="sessionInformationExpiredStrategy" ref="redirectSessionInformationExpiredStrategy" /> </bean> <bean id="redirectSessionInformationExpiredStrategy" class="org.springframework.security.web.session.SimpleRedirectSessionInformationExpiredStrategy"> <constructor-arg name="invalidSessionUrl" value="/login.html" /> </bean>

二、SpringBoot项目

三、Bean配置说明

  • SessionAuthenticationStrategy:该接口中存在onAuthentication方法用于对新登录用户进行session相关的校验。
  • 查看UsernamePasswordAuthenticationFilter及其父类代码,可以发现在doFilter中存在sessionStrategy.onAuthentication(authResult, request, response);方法
  • 但UsernamePasswordAuthenticationFilter中的sessionStrategy对象默认为NullAuthenticatedSessionStrategy,即不对session进行相关验证。
  • 如本文配置,建立id为sas的CompositeSessionAuthenticationStrategy的Bean对象。
  • CompositeSessionAuthenticationStrategy可以理解为一个托管类,托管所有实现SessionAuthenticationStrategy接口的对象,用来批量托管执行onAuthentication函数
  • 这里CompositeSessionAuthenticationStrategy中注入了三个对象,关注ConcurrentSessionControlAuthenticationStrategy,它实现了对于session并发的控制
  • UsernamePasswordAuthenticationFilter的Bean中注入新配置的sas,用于替换原本的NullAuthenticatedSessionStrategy
  • ConcurrentSessionFilter的Bean用来验证session是否失效,并通过SimpleRedirectSessionInformationExpiredStrategy将失败访问进行跳转。

四、代码流程说明(这里模拟用户现在A处登录,随后用户在B处登录,之后A处再进行操作时会返回失败,提示重新登录)

1、用户在A处登录,UsernamePasswordAuthenticationFilter调用sessionStrategy.onAuthentication进行session验证

2、ConcurrentSessionControlAuthenticationStrategy中的onAuthentication开始进行session验证,服务器中保存了登录后的session

/** * In addition to the steps from the superclass, the sessionRegistry will be updated * with the new session information. */ public void onAuthentication(Authentication authentication, HttpServletRequest request, HttpServletResponse response) { //根据所登录的用户信息,查询相对应的现存session列表 final List<SessionInformation> sessions = sessionRegistry.getAllSessions( authentication.getPrincipal(), false); int sessionCount = sessions.size(); //获取session并发数量,对于XML中的maximumSessions int allowedSessions = getMaximumSessionsForThisUser(authentication); //判断现有session列表数量和并发控制数间的关系 //如果是首次登录,根据xml配置,这里应该是0<1,程序将会继续向下执行, //最终执行到SessionRegistryImpl的registerNewSession进行新session的保存 if (sessionCount < allowedSessions) { // They haven't got too many login sessions running at present return; } if (allowedSessions == -1) { // We permit unlimited logins return; } if (sessionCount == allowedSessions) { //获取本次http请求的session HttpSession session = request.getSession(false); if (session != null) { // Only permit it though if this request is associated with one of the // already registered sessions for (SessionInformation si : sessions) { //循环已保存的session列表,判断本次http请求session是否已经保存 if (si.getSessionId().equals(session.getId())) { //本次http请求是有效请求,返回执行下一个filter return; } } } // If the session is null, a new one will be created by the parent class, // exceeding the allowed number } //本次http请求为新请求,进入具体判断 allowableSessionsExceeded(sessions, allowedSessions, sessionRegistry); }/** * Allows subclasses to customise behaviour when too many sessions are detected. * * @param sessions either <code>null</code> or all unexpired sessions associated with * the principal * @param allowableSessions the number of concurrent sessions the user is allowed to * have * @param registry an instance of the <code>SessionRegistry</code> for subclass use * */ protected void allowableSessionsExceeded(List<SessionInformation> sessions, int allowableSessions, SessionRegistry registry) throws SessionAuthenticationException { //根据exceptionIfMaximumExceeded判断是否要将新http请求拒绝 //exceptionIfMaximumExceeded也可以在XML中配置 if (exceptionIfMaximumExceeded || (sessions == null)) { throw new SessionAuthenticationException(messages.getMessage( "ConcurrentSessionControlAuthenticationStrategy.exceededAllowed", new Object[] { Integer.valueOf(allowableSessions) }, "Maximum sessions of {0} for this principal exceeded")); } // Determine least recently used session, and mark it for invalidation SessionInformation leastRecentlyUsed = null; //若不拒绝新请求,遍历现存seesion列表 for (SessionInformation session : sessions) { //获取上一次/已存的session信息 if ((leastRecentlyUsed == null) || session.getLastRequest() .before(leastRecentlyUsed.getLastRequest())) { leastRecentlyUsed = session; } } //将上次session信息写为无效(欺骗) leastRecentlyUsed.expireNow(); }

3、用户在B处登录,再次通过ConcurrentSessionControlAuthenticationStrategy的检查,将A处登录的session置于无效状态,并在session列表中添加本次session

4、用户在A处尝试进行其他操作,ConcurrentSessionFilter进行Session相关的验证,发现A处用户已经失效,提示重新登录

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) req; HttpServletResponse response = (HttpServletResponse) res; //获取本次http请求的session HttpSession session = request.getSession(false); if (session != null) { //从本地session关系表中取出本次http访问的具体session信息 SessionInformation info = sessionRegistry.getSessionInformation(session .getId()); //如果存在信息,则继续执行 if (info != null) { //判断session是否已经失效(这一步在本文4.2中被执行) if (info.isExpired()) { // Expired - abort processing if (logger.isDebugEnabled()) { logger.debug("Requested session ID " + request.getRequestedSessionId() + " has expired."); } //执行登出操作 doLogout(request, response); //从XML配置中的redirectSessionInformationExpiredStrategy获取URL重定向信息,页面跳转到登录页面 this.sessionInformationExpiredStrategy.onExpiredSessionDetected(new SessionInformationExpiredEvent(info, request, response)); return; } else { // Non-expired - update last request date/time sessionRegistry.refreshLastRequest(info.getSessionId()); } } } chain.doFilter(request, response); }

5、A处用户只能再次登录,这时B处用户session将会失效重登,如此循环

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

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