Can SiteB Restrict Access Only to Users Authenticated on Site A? How?

Posted by DaveDev on Stack Overflow See other posts from Stack Overflow or by DaveDev
Published on 2010-04-17T12:12:29Z Indexed on 2010/04/17 12:23 UTC
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authentication

I have recently been asked to estimate a piece of work which will provide functionality for authenticated users to access our site. The thing is, the user has to authenticate on a different site & domain to the one we are hosting.

The user authenticates on SiteA.com and they are provided with a link to our site, SiteB. Only users who have authenticated on SiteA are allowed to access SiteB.com.

I don't yet know what authentication system SiteA is using, but I thought I'd ask the community for some initial thoughts. Is this even possible? What do I need to consider?

Thanks

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