Re: sshd brute force attempts?

"Dan Mahoney, System Admin" <danm@xxxxxxxxxxxxxxx> writes:

I've found a few things based on openBSD's pf, but that doesn't seem to be
the default in BSD either.

Recent BSDs (all of them, FreeBSD 5.n/6.n included) have PF in the base system.
'overload' rules are fairly easy to set up, eg

table <bruteforce> persist

#Then somewhere fairly early in your rule set you set up to block from the bruteforcers

block quick from <bruteforce>

#And finally, your pass rule.

pass inet proto tcp from any to $localnet port $tcp_services \
flags S/SA keep state \
(max-src-conn 100, max-src-conn-rate 15/5, \
overload <bruteforce> flush global)

for more detailed discussion see eg http://www.bgnett.no/~peter/pf/en/bruteforce.html

--
Peter N. M. Hansteen, member of the first RFC 1149 implementation team
http://www.blug.linux.no/rfc1149/ http://www.datadok.no/ http://www.nuug.no/
"First, we kill all the spammers" The Usenet Bard, "Twice-forwarded tales"
20:11:56 delilah spamd[26905]: 146.151.48.74: disconnected after 36099 seconds

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