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Excerpt

CAS is a multiprotocol Web single sign-on (SSO) product composed of a single logical server component that services authentication requests from multiple clients that communicate via one or more supported protocols.

The CAS server delegates authentication decisions to any number of supported authentication mechanisms including LDAP/Active Directory, Kerberos, and RDBMS. The hallmark of CAS is ease of integration and extension in support of a wide variety of environments. In addition to supporting a large number of technologies out of the box, the well-documented API extension points have enabled deployers to develop custom components to support novel use cases not supported by CAS out of the boxdefault.

Features

CAS has a number of features that distinguish it from other SSO products:

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CAS

Shibboleth

OpenID

SiteMinder

OpenSSO

Forced reauthentication

(tick)

(error)

(question)

(question)

(question)

Delegated authentication

(tick)

(tick)21

(question)

(question)

(question)

Attribute release

(tick)

(tick)

(question)

(question)

(question)

Authorization services 1

(error)2

(error)2

(question)

(question)

(question)

Single sign-out

(tick)

(error)

(question)

(question)

(question)

Federation support

(error)

(tick)

(error)

(error)

(error)

Notes:
1. Delegated authentication is supported in Shibboleth out of the box in v2.2+, v2.1.3+ with delegation plugin.
2. As discussed in the Authorization section, CAS supports authorization by services via the attribute release feature. Shibboleth uses the same decentralized approach to authorization. 2. Supported in Shibboleth out of the box in v2.2+, v2.1.3+ with delegation plugin.

Support

CAS is supported by a community of developers and users via a variety of means:

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Architecture