Date: Thu, 18 Sep 2008 01:49:16 +0200 From: Mel <fbsd.questions@rachie.is-a-geek.net> To: freebsd-questions@freebsd.org Cc: "Marc G. Fournier" <scrappy@hub.org> Subject: Re: Auto blacklist ssh connections ... Message-ID: <200809180149.17189.fbsd.questions@rachie.is-a-geek.net> In-Reply-To: <14143EECEC1CC52A4BC39AC3@ganymede.hub.org> References: <14143EECEC1CC52A4BC39AC3@ganymede.hub.org>
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On Thursday 18 September 2008 01:15:45 Marc G. Fournier wrote: > Does anyone know of a utility that I can use with sshd to auto-block by IP > if there are more then N failed attempts in a row? # crontab -l @reboot /usr/sbin/daemon -p /var/run/grok-ssh.pid /usr/local/bin/grok -f /etc/pf/grok-ssh.conf # grep -- -0F /usr/local/bin/grok my $TAIL = "/usr/bin/tail -0F"; ^^^^ so that newsyslog doesn't interfere. $ cat /etc/pf/grok-ssh.conf file "/var/log/auth.log" { type "ssh-illegal-user" { match = "Invalid user %USERNAME% from %IP%"; threshold = 5; # 5 hits ... key = "%IP%"; # from a single ip ... interval = 60; # in 1 minutes reaction = "/root/bin/pfscanners %IP%"; # permanent }; type "ssh-scan-possible" { match = "Did not receive identification string from %IP%"; threshold = 3; interval = 60; reaction = "/sbin/pfctl -t scanners -Tadd %IP%"; #temporary }; }; $ cat /root/bin/pfscanners #!/bin/sh while( test ! -z "$1" ); do /sbin/pfctl -t scanners -Tadd $1 echo $1 >> /etc/pf/scanners.table shift done $ grep scanners /etc/pf.conf table <scanners> persist file "/etc/pf/scanners.table" block in log on $ext_if from <scanners> -- Mel Problem with today's modular software: they start with the modules and never get to the software part.
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