I suspect that you may need to follow the approach taking to CASify
OWA, namely the use of a small authentication shim deployed along side
SP2010 and the use of the CAS ClearPass extension to get the password
from CAS.

Some links that may be helpful:

https://wiki.jasig.org/display/CASUM/ClearPass
https://github.com/wgthom/CasOwa
https://github.com/wgthom/clearpass-cas
https://wiki.jasig.org/display/CAS/CASifying+Outlook+Web+Access+2
https://wiki.jasig.org/download/attachments/29133748/jasig2010_clearpass.pdf

> We have few questions:
> 1.      Any link / document which describes the exact steps to follow to 
> integrate CAS with SharePoint 2010
Not yet...but hopefully we can help you get there and you can write it. :)

> 2.      Any way out to overcome the above problem (need to pass a password)
Yes, CAS ClearPass extension.

> 3.      Has Jasig / Yale come up with a solution on this?
Not I know of...

> 4.      Is there some way Jasig / Yale web service can pass the credentials 
> along with the Boolean value (Yes / No- if user is authenticated), so we pass 
> the user’s password in the above redirect method?
Yes, CAS ClearPass extension.

Bill


On Wed, Feb 9, 2011 at 8:07 AM, Kaustubh
<kaustubh_anwe...@persistent.co.in> wrote:
> Hi,
>
> We have a requirement where we need to integrate Central Authentication 
> Service (CAS) with SharePoint 2010. We did find a pointer to integrate it 
> with MOSS 2007 (http://eduyalesomauth.codeplex.com/), however SharePoint 2010 
> claims based authentication is built on Windows Identity Foundation (WIF), 
> hence this solution is not useful.
>
> Helpful links found through google discuss of an inherent issue faced by 
> people when integrating CAS with SharePoint 2010; SharePoint expects the 
> user’s password when redirecting after successful authentication at the 
> following line:
>
> SPClaimsUtility.AuthenticateFormsUser(Request.Url, username, password);
>
> (Details of this issue can be found here- 
> http://stackoverflow.com/questions/3428152/issues-using-external-authentication-with-sharepoint-2010
>  )
>
> We have few questions:
> 1.      Any link / document which describes the exact steps to follow to 
> integrate CAS with SharePoint 2010
> 2.      Any way out to overcome the above problem (need to pass a password)
> 3.      Has Jasig / Yale come up with a solution on this?
> 4.      Is there some way Jasig / Yale web service can pass the credentials 
> along with the Boolean value (Yes / No- if user is authenticated), so we pass 
> the user’s password in the above redirect method?
>
> Thanks in advance!
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