this post was submitted on 24 Nov 2023
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Safely Self-Hosting a Minecraft server (alien.top)
submitted 11 months ago by SparkyGears@alien.top to c/main@selfhosted.forum
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My nephews really enjoy Minecraft and so for Christmas, I want to give them a server for us all to play on (of course, self-hosted). The issue is that I've only got a vague idea about how one can safely self-host it, any ideas are greatly appreciated.

The more safe way that I'd personally do something like this would be to VPN into my homelab (Wireguard + DuckDNS) and access the server that way. For practical reasons that's not going to fly... I'd like to connect to the game server from anywhere, with any account, and without a VPN. This will make it accessible to the kids.

When one adds a server in Minecraft, it seems like they specify a FQDN:Port (MySite.com:25565). I could punch port forwards in my firewall and call it a day, but this seems insecure. Going forward I'm not going to forward any ports without some layer of encryption or authentication on the other side (seems like the latest best practice).

Cloudflare Zero Trust sounded like the ideal solution, notably because it's free, but also that it has intrinsic protection against DoS attacks. This isn't self-hosted though, and to properly utilize this, I would need to purchase my own domain name (not opposed to that, just an extra cost).

How do you guys architect your services to be secure while also being broadly accessible on the Internet? I imagine it's a similar tale for self-hosting a website, just in this case it's a Minecraft server. Thanks much.

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[–] navigatron@beehaw.org 5 points 11 months ago

In networking, you generally either have an authentication mechanism, or you don’t.

It sounds like you don’t have “control” (can install a vpn) on the client devices. This makes authentication difficult. We need some aspect of the client that the server can use to make a decision.

Without touching the client, there’s only really two details we can use - the source ip address of the client, and the port that they are connecting to.

If a client wants to connect to the default minecraft port, it could be a scanner - but if it’s non-default, then the probability of being a scanner is much lower.

A firewall to do geo-based ip blocking will also cut down significantly on noise.

After that, minecraft’s built in authentication is pretty good.

With all of the above, we would know that the connector is coming from an allowed location, knows to ask for your non-standard port number, and has a valid minecraft account - that sounds pretty good to me.

And if you’re running a cracked server, there are other assorted tricks to avoid bots. I ran an open-to-the-world, default port, no auth server for some time; and probably ran into a single robot. Thankfully I shut things down before log4j