Sergio, I think Kevin and I realize that dictionary attacks are automated, but a 30-60 second delay would significantly slow them down to the point where it could hardly be called a brute force attack. On Wed, 2008-07-09 at 17:14 +0000, Sergio Castro wrote: > The brute force attacks are most likely automated, so if your objective is > to bore a human to death with 30 second delays, it wont' work. > > Have you thought about limiting access to the service to only certain IPs? > > - Sergio > > -----Mensaje original----- > De: listbounce@xxxxxxxxxxxxxxxxx [mailto:listbounce@xxxxxxxxxxxxxxxxx] En > nombre de Zembower, Kevin > Enviado el: Miércoles, 09 de Julio de 2008 11:56 a.m. > Para: secureshell@xxxxxxxxxxxxxxxxx > Asunto: Deliberately create slow SSH response? > > This might seem like a strange question to ask, but is there a way to > deliberately create a slow response to an SSH request? I'm annoyed at the > large number of distributed SSH brute-force attacks on a server I > administer, trying to guess the password for 'root' and other accounts. > I think that my server is pretty secure; doesn't allow root to log in > through SSH, only a restricted number of accounts are allowed SSH access, > with I think pretty good passwords. But still, the attempts annoy me. > > I wouldn't mind if SSH took say 30 seconds to ask me for my password. > This would slow the attempts. Is there any way to configure OpenSSH to do > this? I searched the archives of this group with 'slow' and 'delay' > but didn't come up with anything on this topic. Please point it out to me if > I overlooked anything. In addition, I can limit the number of SSH > connections to 3-5 and still operate okay. > > Ultimately, I need this solution for hosts running OpenSSH_3.9p1 under RHEL > ES 4 and OpenSSH_4.3p2 under Debian 'etch' 4.0 and Fedora Core 6. > > Thanks in advance for your advice and suggestions. > > -Kevin > > Kevin Zembower > Internet Services Group manager > Center for Communication Programs > Bloomberg School of Public Health > Johns Hopkins University > 111 Market Place, Suite 310 > Baltimore, Maryland 21202 > 410-659-6139 > > > __________ NOD32 3255 (20080709) Information __________ > > This message was checked by NOD32 antivirus system. > http://www.eset.com > >
