this post was submitted on 23 Jul 2025
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How to enhance Caddy's basic_auth? (lemmy.kde.social)
submitted 3 days ago by tubbadu@lemmy.kde.social to c/selfhosted@lemmy.world
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Hello fellow selfhoster! on my debian server I use Caddy as reverse proxy, and would like to protect some services and files with a password. I would like, however, to be able to access some protected files programmatically, from a script. using Caddy's built-in basic_auth works as intended, but I'd like to be able to use a login form instead of just a browser prompt. This is AFAIK not possible, so I'm looking for alternatives. Any idea?

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[–] notquitenothing@sh.itjust.works 12 points 3 days ago* (last edited 3 days ago) (1 children)

Developer of VoidAuth here, you could give that a try! If you have any issues or questions I can help :) VoidAuth

It does support basic_auth to ProxyAuth protected domains, so you can set up a user for that purpose. Docs for that are here: ProxyAuth

[–] tubbadu@lemmy.kde.social 2 points 3 days ago (1 children)

This looks very interesting! I see that it supports users groups, would it be possible to create "named access policies" (like "admin_only_policy", "group_XXX_policy" ecc) and then assign them to the various services directly in the Caddyfile? thank you very much!

[–] notquitenothing@sh.itjust.works 2 points 2 days ago* (last edited 2 days ago)

I don’t think you could do that directly in the Caddyfile, but you can create those groups/policies inside VoidAuth and assign them to users there.

The steps would be to (in VoidAuth) create the access group/policy, create the ProxyAuth Domain (protected.example.com/*) with the allowed group(s), make sure the user(s) have that group, then in Caddy add the forward_auth directive to the same route you want to protect.

Then when you go to access that route in a browser it will redirect you to VoidAuth login, or if you pass an Authentication header with Basic Auth (like when using an API) it will use that.