I am trying a solution of SSO between share-point site and ASP..net page.
I have users authenticating against AD and land on .Net MVC page with claim [claim is generated by Siteminder], without installing an agent on Sharepoint can i redirect user from the .net MVC page to sharepoint where sharepoint is confiured with claims based authentication.
There is SharePoint Agent (which do not seem to be your preference) and there is this if you have not already read it.
It is federation runbook that covers federation to sharepoint(O365).
If that is not what you are looking for, can you elaborate further?