How can I organize either simultaneous login (as in Yandex), or login using an account on the corporate portal?

Question

OAuth

It is necessary to organize SSO authentication. Is there a corporate portal on Bitrix, are there sites made on muddle? Bitrix (all in different domains). How can I organize either simultaneous login (as in Yandex), or login using an account on the corporate portal?

Log in to any of the available sites → click on the “Login” button → a single authorization window opens in the Corporate Portal domain → enter data for log / pass authorization → data on the active session is saved on the server → go to another site from the existing ones (Site 1) → click on the "Login" button → a window opens with the inscription "Ivanov Ivan, is that you?" and the selection options “Yes, allow entry”, “No, proceed to authorization” → when you click “Yes, allow entry”, authorization is performed on Site 1 → when you click on the “Logout” button on Site 1 or on the Corporate Portal, data on the active session are removed.

How can it be implemented?