我折腾过这个，觉得还可以：http://code.google.com/p/rubycas-server/

#1 楼 @yangyanhao 我记得这个只支持 1.8，不知道现在怎样了

不知道有没有人用过这个 https://github.com/joshsoftware/sso-devise-omniauth-provider Single Sign-On using Devise and Omniauth We wanted to solve these problems: A single User Manager application (which will authenticate ALL users with different roles) Different internal applications which talk to User Manager for authentication User should be able to login/sign-up via Social Networks like Twitter and Facebook. Single Sign On between all applications.

如果后端 app 全是 ruby 的 rack app，可以用 warden middleware，这样觉得挺方便的。全部 app 跑在一个进程里，需要时调用下 warden 的规则就好了。 这是个例子：http://team.skroutz.gr/posts/skroutz-warden/ 那种凭 key 来做单点登录的，太高端了吧～～

看这个 commit，“all specs should now pass under ruby 1.9.2 and 1.8.7”， https://github.com/gunark/rubycas-server/commit/4369335d745348626dc388b032472f662ea3218e

谢谢

基于 Devise 和 Omniauth 实现单点登录 http://blog.joshsoftware.com/2010/12/16/multiple-applications-with-devise-omniauth-and-single-sign-on/

以前用 JAVA 做过课程设计！ruby 的话，不清楚~表示关注~

就用 omniauth 就足够了...