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How can I restrict visiting a service through a domain to VPN-connected devices? (lemmy.world)

submitted 2 years ago by TheQuantumPhysicist@lemmy.world to c/selfhosted@lemmy.world

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Say I have a public server with a service (email, web server, etc) that's accessible through https://myservice.example.com, and I would like to restrict that service with a VPN. How do I do that?

I know how to setup a VPN. I know how to use some of the services through that VPN. But see, if I want to use that VPN, I connect my client to that VPN, then I get the subnet of that VPN, say 10.10.100.0, through which I can access the devices by address.

But I see some services offer things like https://myservice.example.com, and they only work when that VPN is connected. How does that work? Is it just some DNS setting at the domain level or there's more to it?

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[–] TheQuantumPhysicist@lemmy.world 1 points 2 years ago (8 children)

But what about the domain name association? How is that done?

[–] InvertedParallax@lemm.ee 2 points 2 years ago (7 children)

Same as the public one, just with an internal address.

Have this on my domain, public domain with a subdomain server behind VPN and 1 host that points to an internal address.

Anyone tries to reach from outside just times out or something.

DNS is just a lookup of names to numbers, that's all it is, the numbers can be anything, I can point my domain to Google if I want.

[–] TheQuantumPhysicist@lemmy.world 1 points 2 years ago* (last edited 2 years ago) (6 children)

Please elaborate a little more. So assuming the server where the service lies has IP address 1.2.3.4, and some VPN that I can connect to with 1.2.3.4:1194. If my DNS server points to 1.2.3.4, and say there's an http server there that's normally accessible with 1.2.3.4:80, how will we enforce that working only through VPN?

[–] InvertedParallax@lemm.ee 1 points 2 years ago

There's an internal ip address for the VPN server, say 4.3.2.1, you point the http dns record to that address.

The VPN server has 2 addresses by definition, an internal address and an external, public one that you connect the VPN to. Make sure the webserver only exposes itself on the private address, either by configuration (nginx/apache listen address) or by firewall (iptables -A input -j DROP)

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