[CentOS] Intrusion Attempt Prevension - iptables problems

Ned Slider ned at unixmail.co.uk
Mon Jan 12 23:47:08 UTC 2009


David Klann wrote:
> New to the list, so please forgive unintentional netiquette
> transgressions...
> 

Welcome :-)

<snip>

> 
> Discounting DoS or DDoS attacks, my solution to nefarious SSH attempts
> is threefold: 1) run sshd on a port other than 22 (I know, obscurity
> is not security...), 2) disable the root account (e.g., set the root
> password to '*' in /etc/shadow), and allow only sudo(1) access to
> privileged commands (this is the default on Ubuntu systems), and 3)
> disable password authentication in sshd_config and require all ssh
> users to log in using public key authentication.
> 
> Probably other things one can do, but I think this is a good first
> step.
> 

http://wiki.centos.org/HowTos/Network/SecuringSSH



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