basicauth
: https://caddyserver.com/docs/caddyfile/directives/basicauthmost reverse proxies have SSO tooling that you can set up pretty easily
But honestly, have you considered just using wireguard for these cases? It’s much more secure if you just want a bunch of stuff hidden from the rest of the world
try wg-easy. it’s on the docker hub and it makes setting up a wireguard tunnel incredibly easy (as in, press the add button). The initial docker configuration process was a bit annoying to me since I had no prior experience, but most of the issues were down to the dns settings, which I eventually figured out.