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Why disable ssh login with root on a server if I only log in with keys, not password?
(sh.itjust.works)
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Doesn't even have to be the key necessarily. Could get in via some exploit first. Either way taking over the machine became a 2-step process.
you would need 2 different exploits for 2 different types of attack though.
its always good to have an extra layer of "oh shit i need another exploit". unless your threat modelling includes nation-states, that is.
At which point you should have a handful of extra layers