Hi Kevin, Here are a few solutions that I can think of at the moment; -Change your sshd port from 22 to something less prone to scans/attacks. i.e. 122, 222, etc... -Disable password authentication? -TCP wrappers that spawn a script at every ssh connection and checks for IP and validate if it has been denied a connection before, and put the IP in /etc/hosts.deny if x amount of attempts is reached. You would script something and put it in /etc/hosts.allow in the following format: (your SSH should be compiled with libwrap) sshd : all : spawn (/path/to/your_script.sh %a)& - You can also use http://denyhosts.sourceforge.net/ which is a python script that should work fine with the Linux distros that you list. Hope this helps. -Ed ----- Original Message ---- > From: "Zembower, Kevin" <kzembowe@xxxxxxxxxx> > To: secureshell@xxxxxxxxxxxxxxxxx > Sent: Wednesday, July 9, 2008 12:55:34 PM > Subject: 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 __________________________________________________________________ Yahoo! Canada Toolbar: Search from anywhere on the web, and bookmark your favourite sites. Download it now at http://ca.toolbar.yahoo.com.
