Short answer: CAS < v5 cannot act like a standalone SAML IDP. CAS 5 can -> 
https://apereo.github.io/cas/development/installation/Configuring-SAML2-Authentication.html
 
<https://apereo.github.io/cas/development/installation/Configuring-SAML2-Authentication.html>

Cheers,
D.



> On Oct 13, 2016, at 12:56 PM, Yan Zhou <yanand...@gmail.com> wrote:
> 
> Hi there, 
> 
> I am a little confused on SAML support on CAS 4.1.x.  It maybe my 
> understanding of SAML is very beginning, too.
> 
> I have viewed CAS as an Enterprise SSO solution, rather than a Federated SSO 
> solution (across enterprises). But, I hear different things about SAML 
> support in CAS. 
> 
> CAS 4.1.x doc says:  The CAS server implements the CAS protocol on server 
> side and may even behave like .... SAML IdP.    How does CAS 4.1.X behave 
> like  SAML IdP?  
> 
> The doc says that CAS supports the standardized SAML 1.1 protocol primarily 
> to:  1)Support a method of attribute release  2) Single Logout.  It seems 
> suggesting that it does _not_ act like SAML IdP?
> 
> The doc. also says that CAS can serve as the authentication provider for 
> Shibboleth.   If CAS 4.1.X can behave like SAML IdP, why would it need 
> Shibboleth?
> 
> Thanks,
> 
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