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Implement Deny Hosts

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denyhosts denyhosts

DenyHosts is a script intended to be run by Linux system administrators to help prevent SSH server attacks (also known as dictionary based attacks and brute force attacks) - http://denyhosts.sourceforge.net/

Configuration example: set  /etc/hosts for specific restrictions. in this example, allowing *.utexas.edu domain hosts, and restricting everything else.

/etc/hosts./allow
ALL: .utexas.edu
and /etc/hosts.deny
ALL:PARANOID

/etc/hosts.allow is checked 1st, then /etc/hosts.deny.

Particular services can also be allowed to only particular machines,  e.g:

/etc/hosts.allow
sshd:hostname (allowed name of machine or IP address) 
and /etc/hosts.deny
sshd:ALL

Limit SSH Access to Campus Network

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sshaccess sshaccess

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