zlacker

>>todsac+(OP)
Every server gets constantly probed for SSH. Since half the servers on the Internet haven't been taken over yet, it doesn't seem like SSH has significant exploits (well, there was that one signal handler race condition).

Unless you're trying to do one of those designs that cloud vendors push to fully protect every single traffic flow, most people have some kind of very secure entry point into their private network and that's sufficient to stop any random internet attacks (doesn't stop trojans, phishing, etc). You have something like OpenSSH or Wireguard and then it doesn't matter how insecure the stuff behind that is, because the attacker can't get past it.

>>immibi+U4
OpenSSH has no currently known flaws but in past it contained a couple. For example, the xz backdoor utilized OpenSSH and it has contained a remote vulnerability in past (around 2003). Furthermore, some people use password auth as well as weak (low entropy or reused, breached) passwords. Instead, only use public key authentication. And tarpit the mofos brute forcing SSH (e.g. with fail2ban). They always do it on IPv4, not IPv6. So another useful layer (aside from not using IPv4) is whitelist IPv4 addresses who require access to SSH server. There is no reason for the entire world to need access to your home network's SSH server. Or, at the very least, don't use port 22. When in doubt: check your logs.

>>Fnoord+M6
Also, if you’re running SSH on a non-standard port, block Censys’ IP ranges. They port scan the entire internet constantly and bad actors use their scans to target their attacks. Once I did that, the number of attempted SSH logins went to zero pretty quickly.

>>wl+V9
Solid advice! I've had certain countries in my blocklist thus far, and now I have added Censys (I did not know that was the company behind Shodan). Now, I've also added the Tor exit node list as my blocklist. Since nothing good comes from any of these. I used this blocklist for the latter [1] (the Censys ranges I just did manually, as it is only 12 entries in total).

[1] https://github.com/7c/torfilter

>>Fnoord+yl
I hope you'll reconsider your stance on Tor exit nodes; many people use the Tor network to avoid censorship or even just bolster their own privacy. Blacklisting users on the basis of their Tor usage is hostile to their goals of privacy and anti-censorship.