From owner-freebsd-questions@FreeBSD.ORG Fri Mar 5 17:04:35 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6592A106567E for ; Fri, 5 Mar 2010 17:04:35 +0000 (UTC) (envelope-from m.seaman@infracaninophile.co.uk) Received: from smtp.infracaninophile.co.uk (gate6.infracaninophile.co.uk [IPv6:2001:8b0:151:1::1]) by mx1.freebsd.org (Postfix) with ESMTP id C7BC98FC26 for ; Fri, 5 Mar 2010 17:04:34 +0000 (UTC) Received: from seedling.black-earth.co.uk (seedling.black-earth.co.uk [81.187.76.163]) (authenticated bits=0) by smtp.infracaninophile.co.uk (8.14.4/8.14.4) with ESMTP id o25H43Gq001172 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Fri, 5 Mar 2010 17:04:03 GMT (envelope-from m.seaman@infracaninophile.co.uk) Message-ID: <4B913983.30900@infracaninophile.co.uk> Date: Fri, 05 Mar 2010 17:04:03 +0000 From: Matthew Seaman Organization: Infracaninophile User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-GB; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: Matthias Fechner References: <20100305125446.GA14774@elwood.starfire.mn.org> <4B910139.1080908@joseph-a-nagy-jr.us> <20100305132604.GC14774@elwood.starfire.mn.org> <20100305154439.GA17456@elwood.starfire.mn.org> <4B912ADC.1040802@infracaninophile.co.uk> <4B91375A.4020503@fechner.net> In-Reply-To: <4B91375A.4020503@fechner.net> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Virus-Scanned: clamav-milter 0.95.3 at happy-idiot-talk.infracaninophile.co.uk X-Virus-Status: Clean X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIM_ADSP_ALL, SPF_FAIL autolearn=no version=3.3.0 X-Spam-Checker-Version: SpamAssassin 3.3.0 (2010-01-18) on happy-idiot-talk.infracaninophile.co.uk Cc: freebsd-questions@freebsd.org Subject: Re: Thousands of ssh probes X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Mar 2010 17:04:35 -0000 -----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 persist >> [...near the top of the rules section...] >> block drop in log quick on $ext_if from >> >> [...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 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 persist table const { \ 81.187.76.160/29 \ 2001:8b0:151:1::/64 \ } persist block drop in log quick on $ext_if from pass in on $ext_if proto tcp \ from to $ext_if port ssh \ flags S/SA keep state pass in on $ext_if proto tcp \ from ! to $ext_if port ssh \ flags S/SA keep state \ (max-src-conn-rate 3/30, overload 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-----