this post was submitted on 10 Feb 2025
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Permitting inbound SSH attempts, but disallowing actual logins, is an effective strategy to identify compromised hosts in real-time.
The origin address of any login attempt is betraying it shouldn’t be trusted, and be fed into tarpits and block lists.
I disabled ssh on IPv4 and that reduced hacking attempts by 99%.
It's on IPv6 port 22 with a DNS pointing to it. I can log into it remotely by hostname. Easy.
If it is your single purpose to create a blocklist of suspect IP addresses, I guess this could be a honeypot strategy.
If it's to secure your own servers, you're only playing whack-a-mole using this method. For every IP you block, ten more will pop up.
Instead of blacklisting, it's better to whitelist the IP addresses or ranges that have a legitimate reason to connect to your server, or alternatively use someting like geoip firewall rules to limit the scope of your exposure.
Endlessh and fail2ban are great to setup a ssh honeypot. There even is a Prometheus exporter version for some nice stats
Just expose endlessh on your public port 22 and if needed, configure your actual ssh on a different port. But generally: avoid exposing ssh if you don't actually need it or at least disable root login and disable password authentication completely.
https://github.com/skeeto/endlessh https://github.com/shizunge/endlessh-go https://github.com/itskenny0/fail2ban-endlessh
Since I've switched to using SSH keys for all auth Ive had no problems I'm aware of. Plus I don't need to remember a bunch of passwords.
But then I've had no training in this area. What do I know
I’ve recently seen login attempts using keys, found it curious…
Probably still looking for hosts that have weak Debian SSH keys that users forgot to replace. https://www.hezmatt.org/~mpalmer/blog/2024/04/09/how-i-tripped-over-the-debian-weak-keys-vuln.html