SharePoint Auth inside DNN CMS Module

Hey guys new kid on the block looking for pointers.

I am running a custom module built for DNN CMS (7.3.3). I have a rather complicated knockout supported interface with multiple dialogs.

What I would like is for a new dialog to popup when user selects OneDrive option. And allow user to pick file(s) from their OneDrive.

I understand that this requires multi user authentication tracking. But the problem I am facing is integrating SharePoint Authentication into CMS module build on ASP.Net WebForm with WebAPI service not an app.

Is there any way I can achieve this without having to store user emails and passwords? Rather somehow redirect them to authenticate against their tenant and receive Auth cookie that can be cached or something?