TYPO3 external authentication

Question

We have a TYPO3 CMS to manage user base and as a portal for various user-specific information. We also have a separate ASP.net C# application used for charting visualization with many of the same users with a separate admin backend . Looking to get rid of login portion ASP.net application and use TYPO3 session authentication. Idea is for the user to be able to click a link within their Typo3 frontend and get directed to the ASP.net application which can then authenticate with the Typo3 session and act in accordance. Just wondering if my best bet is to write something in the ASP.net app to get the TYPO3 session cookie (is that possible?) or if I have to do something clunky like oauth2/other service

Answer 1

I would write a TYPO3 authentication service that contacts your ASP.NET app via one of known protocols (REST?) or even custom protocol and checks authentication. If it is successful, the normal TYPO3 authentication process goes on.

It is not enough to simply set a cookie during the authentication. There are other things that has to be done for the user to be "set up" as logged in.