Is it possible to make automatic authorization on the site through a proxy?

Question

proxy

Is it possible to somehow set up a proxy on your VPS so that when using these proxies, automatic authorization occurs on some site, for example, on Habré? Those. so that the proxy or somehow replaces the necessary cookies on the fly or so that they are put into the browser on the local PC. And if I enable these proxies on any PC, and then go to Habr, then I will be automatically logged in there.
Or it may not be a proxy, but for example a subdomain of my site habr.example.com, opening which I will use the habr only in an already authorized form. Or the same only youtube.example.com, for example.
Friends, tell me the solution.

Answer 1

This is a pure MiM attack. For your sites you can do it, but all normal sites include a sticky ssl and everything will not work. Describe the task in more detail.