Authenticate against a RADIUS server?

as I understand it, custom rules and hooks only run after authentication took place, and it is not possible to influence authentication itself.

Is there still some way to support custom hash functions or authenticating vs an external RADIUS server?
We need that (RADIUS more, because many of our customers use RSA SecurID tokens) for migration.

Only solution we found would be to use a custom database and have the user profile split into our data at home and linked accounts etc. in auth0, sounds like a maintenance nightmare :-/

Thanks and regards,

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