zrok Controller Alternative Login Options

[icsy7867]

It would be awesome to have some other authentication options for the ZROK Controller login webpage.

I checked the docs and did not really see anything, but some low hanging (possible) fruit:

1. Email only magic link. No passwords! This would actually work in a lot of my use cases. It would be pretty secure in our environment and I wouldn't have to create and distribute passwords to anyone (When I know they arent going to remember it anyways!)

2. HTTP Header auth - A lot of tools (caddy-security, 0Auth, Authelia, Apache Mellon, etc...) can set special header values when authentication is successful. In Caddy-Security's option, when using OIDC it uses X-Token-User-Email. The login should check for this value, and assign the user based on this value. If the user does not exist, go ahead and create the user.

3. Of course, LDAP, OIDC, SAML, etc.... but those would probably require more intense changes to the code.