2021-02-25 18:16:02 +00:00
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# iblock
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2021-02-25 19:43:58 +00:00
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iblock is an inetd program adding the client IP to a Packet Filter table.
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It is meant to be used to block scanner connecting on unused ports.
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2021-02-28 15:58:50 +00:00
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# How to use
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Start inetd service with this in `/etc/inetd.conf`:
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```
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666 stream tcp nowait root /usr/local/bin/iblock iblock
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```
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Use this in `/etc/pf.conf`, choose which ports will trigger the ban from the variable:
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```
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# services triggering a block
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2021-02-28 16:01:05 +00:00
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blocking_tcp="{ 21 23 53 111 135 137:139 445 1433 25565 5432 3389 3306 27019 }"
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2021-02-28 15:58:50 +00:00
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table <blocked> persist
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pass in quick on egress proto tcp to port $blocking_tcp rdr-to 127.0.0.1 port 666
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block in quick from <blocked>
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```
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Done! You can see IP banned using `pfctl -t blocked -T show` and iBlock will log blocking too.
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# TODO
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- make install doing something
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- A proper man page
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- Support IPv6
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- make it work with doas
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- pf table as a parameter
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