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Block countries on OpenBSD using pf

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Same as in the previous article, full countries can be easily blocked on OpenBSD firewall using the pf command and https://ipdeny.com/.

The zone files provided by https://ipdeny.com/ need to be stored locally. A simple way to achieve this is by having a cronjob downloading those periodically (for instance once per day):

#!/bin/sh

# download the latest country zone files
curl -s https://www.ipdeny.com/ipblocks/data/countries/ru.zone > /etc/ru.zone
curl -s https://www.ipdeny.com/ipblocks/data/countries/cn.zone > /etc/cn.zone


We store them directly to /etc in the above example.

In the /etc/pf.conf, first add a table based on the files you have generated with the above statements:

# add a bad hosts table based on local disk text files
# one CIDR per line
table <badhosts> persist file "/etc/ru.zone" file "/etc/cn.zone"

In the above example, we have created a table called badhosts based on two local files.

Finally we need some rules which actually blocks from and to these network ranges, an example PF block rule could be:

# block bad IP addresses
block from <badhosts> to any
block from any to <badhosts>
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Time based network access control on OpenBSD

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