On a server I have a public key auth only for root account. Is there any point of logging in with a different account?
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No you can alias that command and hijack the password promt via bashrc and then you have the root password as soon as the user enters it.
As root:
# chattr +i /home/ShortN0te/.bashrc
Anything else?
There are many ways to harden against it, but “just disable root auth” is not really it, since it in itself does not add much.
??
Seriously - if you’re “advising” on linux best practices, get lots of liability insurance.
So, you learned about .bashrc today, and you’re now an expert?
Perhaps stand down and let the experts have their say.
No, that’s not how it works.
You really should stop talking shit about things you know nothing about.
Truly sad.