I have a server where I believe I have disabled root login via ssh. I think it is done correctly, as I cannot login with root myself via ssh, but I would’ve thought that it would be reflected in /var/log/auth.log. Instead, it shows up as failed password entry. Is this intended?
What I’ve done is to uncomment the PermitRootLogin no line in /etc/ssh/sshd_config. Rest of the config file is left at default.
Bonus question: All login attempts by ssh seems to go over some random port (even my own successful logins). Why is this?
It’s a mixed bag. Personally I wouldn’t use a non-standard port.
Consider that port numbers under 1024 are Privileged Ports. You would either have to make sure that no other privileged service is running on the port you want to use for SSH when using another privileged port or you need to make sure that no unprivileged program tries to use the same port as your SSH service when using a non-privileged. Overall it adds a bit of overhead and possible headaches for barely any gain.
Fail2ban should work with a different port without any further configuration but it might not.
Alright, cheers - I’ll leave it be as well then :)