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On Tue, 24 Jan 2006 23:21:17 +0100
Robert Larsen <robert@the-playground.dk> wrote:
I "solved" this problem by disabling password authentication and only
permitting rsa authentication.
These options in sshd's config file do the trick:
PasswordAuthentication no
RSAAuthentication yes
PubkeyAuthentication yes
Bruteforce exspects a fast connection because if you try to brute-force
with just 2 trials a minute you'll have mostly no succes.
If you're using OpenBSD you could do the followring:
pass in on $ext_if proto tcp to $web_server \
port 22 flags S/SA keep state \
(max-src-conn 10, max-src-conn-rate 3/10, overload <younerve>
flush)
This would simply drop every Computer wich tries to connect faster then
3 times in 10 seconds.
Just for the case that you're using OpenBSD.
I don't know if a Linuxfirewall could do the same.
You could clean this table e.g. weekly by a cron-job.
Or daily or so on.. depends to your needs.
Additional you should have such a rule too:
block drop in quick from <younerve>
So all further communication with this host gets droped.
Addtinional you should maybe use these sshd.conf-Options too:
PasswordAuthentication no
LoginGraceTime 0s
MaxAuthTries 0
Puplickey-Authentication should still work without any problem.
Kind regards,
Rembrandt
p.s.
You may wanna use the synproxy-Option in pf...
- --
God did a bless on me,
So accapt the dark side in you.
Hate leads me to victory, so give me a war.
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