I think that a package like fail2ban should be added to the repos.
It is a package for watching the log files and adding a firewall rule for hosts that fail authentication.
(from redmine: issue id 525, created on 2011-02-06, closed on 2011-04-27)
- Revision 0839df09 by Jeff Bilyk on 2011-02-07T20:18:28Z:
testing/fail2ban: new aport ref #525
- Revision eb339256 on 2011-04-20T16:45:50Z:
main/fail2ban: moved from testing fixes #525