We have existing mvc application with episerver cms 10. That application performs well. But we now have requirement to implement adfs in existing application. I checked different links on internet regarding this. I can see that it is straight forward for new application but can't find clear guide on how to implement it with existing application. We have lot of existing users in website using sql server membership and ad authentication. How it will behave with ADFS? Please provide me correct guide and links for this?
I'm guessing you want to continue to use both SQL users and AD users(?).
First migrate to AspNetIdentity as described here: https://world.episerver.com/blogs/K-Khan-/Dates/2017/10/migrate-from-sql-membership-to-asp-net-identity/.
Then you can add authentication with ADFS as described here: https://hacksbyme.net/2017/05/07/single-sign-on-to-episerver-with-adfs-using-owin/
Finally add the possibility to login with both AD users, and local SQL users: https://hacksbyme.net/2017/05/11/mixed-mode-owin-authentication-for-episerver-editors/