Inspired by this comment to try to learn what I’m missing.
- Cloudflare proxy
- Reverse Proxy
- Fail2ban
- Docker containers on their own networks
Another concern I have is does it need to be on a separate machine on a vlan from the rest of the network or is that too much?
They aren’t on the internet mainly.
My router (opnsense) has a wireguard server which is how I access things when out of the house.
I do have a minecraft server for my friends and I, but that VM is on its own network isolated from everything else.
Disable password authentication on SSH
Enable firewall and block all ports you’re not using(most firewalls do this by default)
Switch to a LTS kernel(not security related, but it keeps things going smooth… Technically it is safer since it gets updated less often so it is a bit more battle tested? Never investigated whenever a LTS kernel is safer than a standard one)
Use Caddy to proxy to services instead of directly exposing them out
HTTPS for web stuff(Caddy does it automatically)
This and fail2ban
Some I haven’t yet found in this thread:
- rootless podman
- container port mapping to localhost (e.g.
127.0.0.1:8080:8080) - systemd services with many of its sandboxing features (PrivateTmp, …)
Does adding 127.0.0.1 make it so only that server can access it or what? I’ve seen that but not understand
Yes. 127.0.0.0 is the localhost. This is the IP the container is listening on. Even if there was no firewall it wouldn’t allow any connection except from the host. If it’s set to 0.0.0.0 it means it’ll allow connections from any IP (which might not be an issue depending on your setup).
The reverse proxy runs on localhost anyway, so any other IPs have no reason to ever have access.
Yes. 127.0.0.0 is the localhost. This is the IP the container is listening on. Even if there was no firewall it wouldn’t allow any connection except from the host. If it’s set to 0.0.0.0 it means it’ll allow connections from any IP (which might not be an issue depending on your setup).
Thanks for explaining this!
To add some points, that I do:
- Proper logging: So I could realize something unusual is going on
- rootless podman container: harder to escalate privileges and gain root
- Apparmor: same, plus it could trigger suspicious log entries
- Fail2ban
- UFW
- Reverse Proxy
- IPtraf (monitor)
- Lynis (Audit)
- OpenVas (Audit)
- Nessus (Audit)
- Non standard SSH port
- CrowdSec + Appsec
- No root logins
- SSH keys
- Tailscale
- RKHunter
I put up a sign that says, “No hackers allowed plz”
