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:Hack and Crack Proof SSH on Linux
Hack and Crack Proof SSH on Linux
Aug 6, 2007, 09 :00 UTC (8 Talkback[s]) (9969 reads)

(Other stories by David M Williams)

"It's inevitable: if your computer is Internet-connected you will have people coming a-knockin'. Fortunately Linux users are more savvy than to think any keep-alive ping or other piece of Internet flotsam is a hack attempt. Even so, it's simply a matter of time before your router's lights flash heavily and /var/log/auth.log (/var/log/secure on Red Hat) fills with chilling messages like these:

$ tail /var/log/auth.log
Aug  1 20:23:41 zugzug sshd[15577]: (pam_unix) authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=61.218.125.178
Aug  1 20:23:44 zugzug sshd[15577]: Failed password for invalid user edward from 210.48.230.5 port 43812 ssh2

Complete Story

Related Stories:
Block Brute Force Attacks with iptables(Aug 02, 2007)
Leverage Nagios with Plug-Ins You Write(Jul 20, 2007)
Setting Up SSH2 on Red Hat Enterprise Linux(Jul 19, 2007)
How to Secure an SSL VPN with One-Time Passcodes and Mutual Authentication(Jul 03, 2007)


Index Mode   |   Flat Mode   |   Thread Mode   |   Thread Flat  
  Talkback(s) Name  and Date
> Depending on how flexible your network ...   Bad piece of advice   
wsd
Aug 6, 2007, 09:31:36
 
Over in the BSD world, the OpenBSD packe ...   Even easier and generalized with OpenBSD's PF   
Peter N. M. Hansteen
Aug 6, 2007, 10:34:44
 
> > Depending on how flexible your netwo ...   Re: Bad piece of advice   
Matthew Lenz
Aug 6, 2007, 13:00:32
 
...but I'm the only one who needs to ...   I have to login remotely via ssh...   
cjm
Aug 6, 2007, 13:15:28
 
    It is increasingly the case that pro ...   Re: Bad piece of advice   
Hyper L
Aug 6, 2007, 14:33:55
 
>     It is increasingly the case that p ...   Re: Re: Bad piece of advice   
wsd
Aug 6, 2007, 15:18:08
 
1. Disable root login (for reasons given ...   Simpler SSH security measure.   
Rainer Weikusat
Aug 6, 2007, 15:57:02
 
I'm referring to Real World Linux Se ...   Too bad the author didn't read Bob Toxen's   
Ian
Aug 6, 2007, 19:07:01
 
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