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Reverse proxy
(lemdro.id)
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this post was submitted on 05 May 2024
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There are pros and cons to keeping the proxy on the VPS or at home.
If you keep it at home you will have end-to-end encryption from the browser to your home server. Downside, you will not get the IP of the remote client, just the IP of the router, so you won't be able to do IP blocking or diagnostics.
By putting the proxy on the VPS and decrypting HTTPS there you can add remote IPs to connections but you have to keep the TLS certificate on the VPS so in theory someone could mess with it.
A third option is to run a minimal passthrough proxy on the VPS that adds the remote IP to the HTTPS connections without decrypting them. To do this you must use the same proxy at both ends (home and VPS) and both must have the PROXY protocol enabled.
I would suggest doing just proxy at home to start with because it's simpler. If you want a GUI use NPM (Nginx Proxy Manager) it's super easy. If you prefer a proxy where you write config by hand use Caddy.
After you have it working at home you can consider adding the one on VPS and enabling the PROXY protocol. Although I'm not 100% sure Caddy supports it, look into it. You may have to use Nginx in both places I'd it doesn't.
You do not need to add subdomains in DNS, not unless you want to. You just need one domain to point an A/AAAA record at the VPS public IP, then you can make the subdomains a wildcard CNAME pointing at the base domain. So A/AAAA example.com -> IP, and CNAME *.example.com -> example.com. Or you can put the A in another domain and point the CNAME at that.
When requesting TLS certificates it's the same thing, you never ask for explicit certificates for each subdomain, you just ask for one wildcard certificate for *.example.com. Aside from the obvious benefit of not having to add and remove certificates every time you add or remove subdomains, there's the not obvious benefit of not having bots learn about your subdomains (certificate application are public records).
The subdomains do not need to resolve in DNS for this to work, the certbot verifies that you own the domain by using a DNS API key to create a temporary TXT on example.com; as long as that works it won't care what's actually defined in there.
Thanks for the detailed reply. But I'm still confused. Do I need a separate ssh tunnel for every single service I run on my local server?
No, that's the magic of the reverse proxy. You can transport all HTTP services through just one port. It will route them to the correct service on your service based on the domain (which is passed through the HTTP headers).
It won't work for non-HTTP services, for those you'll have to make a separate ssh tunnel per port.
The reverse proxy is going to have a config that says "for hostname 'foo' I should forward traffic to foo.example.com:port".
If you setup the rproxy at home then ssh just needs to forward all port 443 traffic to the rproxy. It doesn't care about hostnames. The rproxy will then get a request with the hostname in the data and forward it to the appropriate target on behalf of the requester.
If you setup the rproxy at the vps then yes - you would need to forward different ports to each backend target. This is because the rproxy would need to direct traffic to each target individually. And if your target is "localhost" (because that's where the ssh endpoint is) then you would differentiate each backend by port.