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Re: Securing SSH

I don't know how to use the firewall to control access to ssh. How do you?

I have been using tcpwrappers to achieve this effect.  I had guessed
this was old fashioned because FC5 did not install xinetd
automatically.  Anyway, here is how I have protected ssh in the past.

in /etc/hosts.deny, insert


In /etc/hosts.allow, insert

portmap: 129.238.61
sshd: 129.238.61.
sshdfwd-X11: 129.238.61.

Make sure xinetd is running, and then all network services that it
controls are going to reject all incoming ssh if they are not in the
ip range 129.238.61.XXX.

Again, that appears to be old fashioned, we were doing that before
iptables was in the kernel.  But I still like it!

I still wish somebody would write up a simple "how to secure your new
FC5 system" without lots of technical jargon.  But, then again, I
still run xinetd. Oh, well.


On 5/24/06, Steven W. Orr <steveo syslang net> wrote:
On Tuesday, May 23rd 2006 at 10:37 -0700, quoth Brian D. McGrew:

=>Good morning,
=>I'm looking to tighten up my ssh configuration.  I have to have SSH open
=>on the box at home so I can get to it from the office.  I've found
=>several articles on securing ssh that include deny root access and
=>require 'wheel' group membership for su.
=>Is changing the port to something non-standard a good idea?  What else
=>can I do; can someone point me to a good write up on it?
=>Brian D. McGrew { brian visionpro com || brian doubledimension com }

Brian, I have the same situation as you. I have a box running at home with
a *very* limited number of people who need to access it. Instead of
cluttering up my syslog with 3digits worth of scriptkiddies hitting my
port 22, I just changed the port nr to something else. (Pick a number
between 1 and 0xFFFFFFFF) Problem solved. It's not a "security thrrough
obscurity" solution. ssh is already as tight as I need AFAICT. All we're
talking about is dealing with the loony robots.

Time flies like the wind. Fruit flies like a banana. Stranger things have  .0.
happened but none stranger than this. Does your driver's license say Organ ..0
Donor?Black holes are where God divided by zero. Listen to me! We are all- 000
individuals! What if this weren't a hypothetical question?
steveo at syslang.net

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Paul E. Johnson
Professor, Political Science
1541 Lilac Lane, Room 504
University of Kansas

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