Date: Wed, 1 Dec 2004 22:33:46 -0800 From: "Ted Mittelstaedt" <tedm@toybox.placo.com> To: "Charles Ulrich" <charles@idealso.com>, <questions@freebsd.org> Subject: RE: blacklisting failed ssh attempts Message-ID: <LOBBIFDAGNMAMLGJJCKNAELKEPAA.tedm@toybox.placo.com> In-Reply-To: <43711.24.11.146.21.1101922894.squirrel@24.11.146.21>
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Charles, This shouldn't bother you unless your in the habit of using guessible passwords. However if you can't let it go I suggest you run sshd with the -i option, out of inetd. Of course you need a fast machine so that the server key is generated in a second or so (or lower your key length) Then replace inetd with xinetd and setup all the DoS stuff on that. Ted > -----Original Message----- > From: owner-freebsd-questions@freebsd.org > [mailto:owner-freebsd-questions@freebsd.org]On Behalf Of Charles Ulrich > Sent: Wednesday, December 01, 2004 9:42 AM > To: questions@freebsd.org > Subject: blacklisting failed ssh attempts > > > > This morning I noticed that an attacker spent over a full hour trying to > brute-force accounts and passwords via ssh on one of our > machines. These kinds > of attacks are becoming more frequent. > > I was wondering: does anyone know of a way to blacklist a certain > IP (ideally, > just for a certain time period) after a certain number of failed login > attempts via ssh? I could change the port that sshd listens on, > but I'd rather > find a better solution, one that isn't just another layer of obscurity. > > Thanks! > > -- > Charles Ulrich > Ideal Solution, LLC - http://www.idealso.com > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" >
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