集中認證服務 CENTRAL AUTHENTICATION SERVICE (CAS)

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The Central Authentication Service (CAS) is the standard mechanism by which web
applications should authenticate users. Any custom applications written benefit
from using CAS.

Note that CAS provides authentication; that is, it determines that your users
are who they say they are. CAS should not be viewed as an access-control system;
in particular, providers of applications that grant access to anyone who
possesses a NetID should understand that loose affiliates of an organization may
be granted NetIDs.

CAS provides enterprise single sign-on service:

An open and well-documented protocol
An open-source Java server component
A library of clients for Java, .Net, PHP, Perl, Apache, uPortal, and others
Integrates with uPortal, BlueSocket, TikiWiki, Mule, Liferay, Moodle and others
Community documentation and implementation support
An extensive community of adopters

http://www.jasig.org/cas