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forwarding port 22 safe?
(alien.top)
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this post was submitted on 28 Nov 2023
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A tremendous amount of cargo culting going on here.
As long as your server is aggressively kept up to date and doesn't have any guessable passwords, exposing port 22 can be done safely. If you're not certain about these, you shouldn't. OpenSSH is exposed to the open internet on millions of servers, it's meant to do this.
Fail2ban or changing your ssh port provides no additional security and only serves to reduce log noise at the risk of blocking actual users.
A VPN makes no practical difference. ssh uses strong encryption just like the VPN. Sure you're hiding ssh, but the VPN provides a similar attack surface.
Wireguard doesn't answer unless you hand shake with a valid package.
There are three 512 bit keys.
And you can put ssh behind it with ssh keys.
The extra later of defence is quite significant.
No "actual user" is blocked by fail2ban. They auth with keys, can't really fail.
Blocking after three fail is very reasonable and effective. It also keeps the logs noise down.