This solution contains a OWIN based federated login solution for sitecore. It's by no means production ready, but it might be an interesting solution.

to install:

• add the following node to your connectionstrings.config:

<add name="AuthSessionStoreContext" providerName="System.Data.SqlClient" connectionString="Data Source=.\;Initial Catalog=WSFedTokens;Integrated Security=False;User ID=sa;Password=xxxxx;"/>

• it creates a new database when it's needed, login tokens will be stored in this database
• Create a controller rendering "Login" - Controller: "Auth" - Controller Action: "Index"
• Create a controller rendering "Logout" - Controller: "Auth" - Controller Action: "Logout"
• Create a page in the root called "Login" and place the login rendering on this page. - this page is used to login. It requires this path, because of some pipeline extension
• Create a page in the root called "Logout" and place the Logout rendering on this page.
• Modify your startup.cs to include your own hostnames. If there is just one site, the pipeline branching is not needed
• If there are any questions: please feel free to contact me.