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What's the real danger of opening ports? (feddit.it)
submitted 1 year ago by to c/selfhosted@lemmy.world
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Some services run really good behind a reverse proxy on 443, but some others can really become an hassle.. And sometimes just opening other ports would be easier than to try configuring everything to work through 443.

An example that comes to my mind is SSH, yeah you can use SSLH to forward requests coming from 443 to 22, but it's so much easier to just leave 22 open..

Now, for SSH, if you have certificate authentication or a strong password, I think you can feel quite safe, but what about other random ports? What risks I'm exposing my server to if I open some of them when needed for a service? Is the effort of trying to pass everything through 443/80 worth it?

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[–] 1 point 1 year ago*

this is nginx / openresty config - upstream is just definition of server / bunch of servers if you do loadbalancing - you can specify load balancing strategies and stuff. Or when want to separate server layer from proxy layer.

stream {
  upstream something {
     server xxx:123;
     server yyy:321;
  }
  server {
     listen 666;
     proxy_pass something;
  }
}

https://docs.nginx.com/nginx/admin-guide/load-balancer/tcp-udp-load-balancer/

I use openresty with autossl, it renews certificates automatically. The only problem is maintaining subdomain allowance otherwise bots will ddos letsencrypt with random domain names, after some quota they will soft ban you for a week to create certificates for new domains / subdomains.

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