本文转自:http://denger.iteye.com/blog/805743
1. 关于CAS的介绍不再累述,我想涉及过SSO同学应该都会对该框架所有了解,我们目前项目采用的CAS Server 版本为 3.4.2.1, 其 CAS Client 版本为 3.1.10。
CAS项目官方:http://www.jasig.org/cas
本文讲述CAS登录处理未包括 CAS Client 与 Server 端的对 ST 采用SMAL验证的流程。
2. 对于登录其主要处理流程:
注册成功后 -> 调用CAS登录处理的相关模块 -> 验证用户名密码 -> 生成TGT -> 生成TG -> Add ST&TGT至相关Register类 -> Add TGT至Cookie -> 重定向至 cas/login URL -> 完成
3. CAS 登录处理主要模块(类):
a. Credentials 用于存储用户登录认证信息接口。
其默认实现类:org.jasig.cas.authentication.principal.UsernamePasswordCredentials
b. CentralAuthenticationService 用于生成 ST(Service Ticket) 和 TGT(TicketGrantingTicket)的认证服务类。
其默认实现类: org.jasig.cas.CentralAuthenticationServiceImpl
c. CookieRetrievingCookieGenerator 用于将TGT添加至Cookie及对Cookie进行管理。
4. 具体实现代码:
/**
* user register process and automatic login.
* @param userForm the user information object.
* @param request the HttpServletRequest object
* @param response the HttpServletResponse object
* @return get result view
*/
protected ModelAndView handleUserRegisterInternal(UserInfoVo userForm, HttpServletRequest request, HttpServletResponse response) { ModelAndView signinView = new ModelAndView(REGISTER_VIEW);;
final boolean isUnique = userService.checkUserUnique(userForm.getLoginName());
final boolean isRegistered = isUnique ? registerUser(userForm, request, response) : false; if (isRegistered) {
bindTicketGrantingTicket(userForm.getLoginName(), userForm.getLoginPassword(), request, response);
signinView.setViewName(getSignInView(request));
}
return signinView;
}
/**
* Invoke generate validate Tickets and add the TGT to cookie.
* @param loginName the user login name.
* @param loginPassword the user login password.
* @param request the HttpServletRequest object.
* @param response the HttpServletResponse object.
*/
protected void bindTicketGrantingTicket(String loginName, String loginPassword, HttpServletRequest request, HttpServletResponse response){
try {
UsernamePasswordCredentials credentials = new UsernamePasswordCredentials();
credentials.setUsername(loginName);
credentials.setPassword(loginPassword);
String ticketGrantingTicket = centralAuthenticationService.createTicketGrantingTicket(credentials);
ticketGrantingTicketCookieGenerator.addCookie(request, response, ticketGrantingTicket);
} catch (TicketException te) {
logger.error("Validate the login name " + loginName + " failure, can't bind the TGT!", te);
} catch (Exception e){
logger.error("bindTicketGrantingTicket has exception.", e);
}
}
/**
* Get the signIn view URL.
* @param request the HttpServletRequest object.
* @return redirect URL
*/
protected String getSignInView(HttpServletRequest request) {
String service = ServletRequestUtils.getStringParameter(request, "service", "");
return ("redirect:login" + (service.length() > 0 ? "?service=" + service : ""));
}
cas-servlet.xml 相关代码:
<bean id="registerController" class="com.xxxxx.sso.web.RegisterController"
p:userService-ref="userService"
p:validator-ref="registerValidator"
p:centralAuthenticationService-ref="centralAuthenticationService"
p:ticketGrantingTicketCookieGenerator-ref="ticketGrantingTicketCookieGenerator"/>
注: 关于centralAuthenticationService及ticketGrantingTicketCookieGenerator已声明在 spring-configuration/applicationContext.xml 和 ticketGrantingTicketCookieGenerator.xml中