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Old 18th February 2009
DNAeon DNAeon is offline
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Join Date: Sep 2008
Location: Bulgaria
Posts: 138
Default Automaticaly block IPs with PF


I frequently check my logs and there are always some ips that are trying to get access to my system using bruteforce or some other scripts. I have never needed a tool to examine my logs and report such attacks, cause I'm looking at my logs very frequently, but now when I won't have that opportunity ( I won't be at home for a certain time ), I'd like to use such a tool that examines the logs and blocks..

What I'm using right now is a table in PF that reads /etc/blocked_ips and blocks each ip listed in the file.
# --- block every ip from /etc/blocked_ips file ---
table <blocked_ips> persist file "/etc/blocked_ips"

# --- block every ip from /etc/blocked_ips file
block in log quick on $ext_if from <blocked_ips> to any
I'd like to use a script that examines for bad ssh logins (/var/log/auth), bad smtp attempts (/var/log/maillog), etc..

I want to ask you - what kind of automatic protection are you using? Some kind of a self-written scripts, or some ports that examines the logs and put the bad ips in file?

"I never think of the future. It comes soon enough." - A.E

Useful links: FreeBSD Handbook | FreeBSD Developer's Handbook | The Porter's Handbook | PF User's Guide | unix-heaven.org
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