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Securing traffic between a proxy and a backend over a VPN. How do you get a certificate for an internal domain? (lemmy.world)

submitted 1 day ago* (last edited 1 day ago) by early_riser@lemmy.world to c/selfhosted@lemmy.world

18 comments fedilink hide all child comments

Bit of a followup to my previous post. I now have a VPS with nginx working as a reverse proxy to some services on my DMZ. My router (UDM pro) is running a wireguard server and the VPS is acting as a client.

I've used Letsencrypt to get certs for the proxy, but the traffic between the proxy and the backend is plain HTTP still. Do I need to worry about securing that traffic considering its behind a VPN? If I should secure it, is there an easier way to do self-signed certs besides spinning up your own certificate authority? Do self-signed certs work between a proxy and a backend, or would one or the other of them throw a fit like a browser does upon encountering a self-signed cert?

I'd rather not have to manage another set of certs just for one service, and I don't want to involve my internal domain if possible.

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[–] mhzawadi@lemmy.horwood.cloud 3 points 1 day ago (2 children)

If your DNS host has an API, you can get any certificate you like for the host.

e.g. a cert for server.example.com

Even though that host doesn't exist in public DNS

[–] vividspecter@aussie.zone 2 points 13 hours ago

You could also get a wildcard cert using dns challenge, and not even expose the subdomains publically.

[–] starshipwinepineapple@programming.dev 2 points 1 day ago

This is what i do via acme.sh with the letsencrypt DNS-01 challenge. I have a cron job scheduled to renew/deploy