Date: Fri, 05 Mar 2010 17:04:03 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Matthias Fechner <idefix@fechner.net> Cc: freebsd-questions@freebsd.org Subject: Re: Thousands of ssh probes Message-ID: <4B913983.30900@infracaninophile.co.uk> In-Reply-To: <4B91375A.4020503@fechner.net> References: <20100305125446.GA14774@elwood.starfire.mn.org> <4B910139.1080908@joseph-a-nagy-jr.us> <20100305132604.GC14774@elwood.starfire.mn.org> <F4960422-5F59-4FF4-A2E4-1F0A4772B78B@olivent.com> <20100305154439.GA17456@elwood.starfire.mn.org> <4B912ADC.1040802@infracaninophile.co.uk> <4B91375A.4020503@fechner.net>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 05/03/2010 16:54:50, Matthias Fechner wrote: > Hi, > > Am 05.03.10 17:01, schrieb Matthew Seaman: >> table <ssh-bruteforce> persist >> [...near the top of the rules section...] >> block drop in log quick on $ext_if from<ssh-bruteforce> >> >> [...later in the rules section...] >> pass in on $ext_if proto tcp \ >> from any to $ext_if port ssh \ >> flags S/SA keep state \ >> (max-src-conn-rate 3/30, overload<ssh-bruteforce> flush global) >> > > that is dangarous, if you use subversion over ssh you will sometimes get > more then 10 requests in 30 seconds. > That means you will also block users they are allowed to connect. Yes. Almost all of the time I use this I've also had a ssh-whitelist table -- addresses that will never be blocked in this way. Like this: table <ssh-bruteforce> persist table <ssh-whitelist> const { \ 81.187.76.160/29 \ 2001:8b0:151:1::/64 \ } persist block drop in log quick on $ext_if from <ssh-bruteforce> pass in on $ext_if proto tcp \ from <ssh-whitelist> to $ext_if port ssh \ flags S/SA keep state pass in on $ext_if proto tcp \ from !<ssh-whitelist> to $ext_if port ssh \ flags S/SA keep state \ (max-src-conn-rate 3/30, overload <ssh-bruteforce> flush global) Cheers, Matthew - -- Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEUEARECAAYFAkuROYMACgkQ8Mjk52CukIwA7ACfcngE3ZsQmRAoTY7sW9aqXfLv IW8Al1Pl4OaGfWbytHAYrfqnWYpNs40= =Yg12 -----END PGP SIGNATURE-----
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