you need a reverse proxy.
this post was submitted on 11 Apr 2024
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I have a reverse proxy, but that won't do ALL traffic, right? Just http or https?
Like if I want to ssh into the different servers, it won't handle that, will it?
you only have one IP. As you rightfully said, reverse proxy does only http(s), port 80/443. this works because of the nature how http requests work. They carry the hostname as part of the protocol (request headers). SSH is a whole other story, since the client does not send the hostname as part of the protocol, only the IP and the port.
What you can do is forward different ports to different machines... 2021 -> server1, 2022 -> server2, etc.
For SSH the ProxyJump directive is awesome. Have one server reachable from outside and then use it to jump to all the others.
Like the other commenter said, that is correct. For SSH, I set up a VM as my SSH bastion or jump host. I connect to that, and the SSH from that to any other machine on the network.
If you control the software stack at both ends you may want to consider Chisel which is a HTTP tunnel for TCP and UDP.
The connections would go SSH client > Chisel client > HTTP reverse proxy > Chisel server > SSH server. The Chisel elements speak HTTP to each other so that segment between them can be routed by domain.
Chisel can also do its own encryption so you can use HTTP and avoid the HTTPS-specific issues about extracting the domain name from the HTTPS connection.
Your router has no idea what domain has been used for a given connection, it knows the IP and only the IP.
HAproxy and NGINX can, because for HTTP you just need to look at the Host header, and for HTTPS, the SNI extension for TLS. Anything that uses TLS should be doable with HAproxy (you don't even need to decrypt the content, just read the SNI and pass it through to the backend as-is).
For other protocols, your only options are either it supports it, or you have to do multiple ports. Or a VPN at that point would also work, remove the problem entirely.
Okay if I'm reading this it's because you want to ssh into two or more servers from the outside. I get the goal, but I'll tell you it's not great security.
What I personally have used and recommend is that you set up a bastion ssh server. A public ssh server that is exposed, preferably on another port, that is heavily locked down. Once you ssh into the bastion, then you're in the network and can ssh anywhere using your internal DNS.
The added security benefit is that if someone does get into that box, they still need to learn your network topography. Not security, but bastion doesn't do anything, so they're not immediately into a core system.
Added bonus if you do a honepot on 22 and bastion on a different port.
Run Caddy as reverse proxy for example : https://caddyserver.com/docs/caddyfile/directives/reverse_proxy#examples Syntax is pretty simple and Caddy can automatically do the SSL certificate handling for you as well. No need to install Certbot.
Don't know of this working this way. The incoming connection needs to connect to a device to find out what the domain was resolved. I think it's easier to forward different ports to different machines.
Example: domain.com resolves to your IP. Port 80 forwards to web/80 on server 0. Port 180 forwards to web/80 on server 1. Port 280 forwards to web/80 on server 2.
Almost all commodity hardware will support this set up.
use haproxy instead of Port forwards, that should work just fine and works really well on opnsense
I have a reverse proxy, but that won't do ALL traffic, right? Just http or https?
Like if I want to ssh into the different servers, it won't handle that, will it?
Reverse-proxies are not necessarily limited to HTTP, but you can set up SSLH in Opnsense to do something similar.
But for SSH you would usually log into one machine and form there do a second SSH connection to other servers in the local network.
Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:
| Fewer Letters | More Letters |
|---|---|
| DNS | Domain Name Service/System |
| HTTP | Hypertext Transfer Protocol, the Web |
| HTTPS | HTTP over SSL |
| IP | Internet Protocol |
| SSH | Secure Shell for remote terminal access |
| SSL | Secure Sockets Layer, for transparent encryption |
| TCP | Transmission Control Protocol, most often over IP |
| TLS | Transport Layer Security, supersedes SSL |
| UDP | User Datagram Protocol, for real-time communications |
| VPN | Virtual Private Network |
10 acronyms in this thread; the most compressed thread commented on today has 10 acronyms.
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