David Kelly wrote:
On Tue, May 06, 2008 at 09:31:15AM -0800, Beech Rintoul wrote:
Is there a way to configure SSHd, so that the wait time between
login attempts increases after X failed tries?
Not that I know of. You should look into denyhosts (in the ports) it
works well and even has a RBL feature to block some of these script
kiddies proactively. Unfortunately, these attempts have become a fact
of life. I probably get 20 - 30 attempts a day between my various
servers.
Depending on how you use ssh from external systems you could add
firewall rules to disallow all but known sources.
I used portsentry several years ago which is a realtime portscan
blocker. It would trigger on this type of ssh portscan for sure. One
problem is that it blocks using firewall rules, hosts.deny etc... and
would have to be actively maintained. Meaning: I cleaned these entries
once a week. I am not sure it is ported to BSD either.
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