Valid statement in pf.conf?

[solarflux.org/pf]

Doug Van Allen wrote:
> Is this valid:
> 
> <b>pass  in  on $ext_if proto tcp from 151.103.xxx.xxx-151.103.xxx.xxx
> to $ext_if port 22 keep state</b>
> 
> I used x's only to hide the other part of the ip address.  I need to
> let in a range of ip's like, 192.168.0.1-192.168.32.254.

No.  Are you trying to let in an entire subnet or a range of IPs that do 
not consist of an entire subnet?

If you want to let an entire subnet in, you can use, for example:

pass in on $ext_if proto tcp from 151.103.50.96/28 to $ext_if port 22 \
	keep state

This lets 151.103.50.96 - 151.103.50.111 pass (really .97-.110).


If you want to use a range that is not an entire subnet, you could use a 
macro with each IP listed:

$sshallowed = "{ 151.103.50.98, 151.103.50.99, 151.103.50.100 }"

The pass rule would then be:

pass in on $ext_if proto tcp from $sshallowed to $ext_if port 22 \
	keep state


An alternative would be to use a table with each IP listed, either 
inclusive or in a separate file.  Inclusive example:

table <sshallowed> persist { 151.103.50.98, 151.103.50.99, \
	151.103.50.100 }

Pass rule:

pass in on $ext_if proto tcp from <sshallowed> to $ext_if port 22 \
	keep state


Separate file example:

table <sshallowed> persist file "/etc/pf.sshallowed"

The file /etc/pf.sshallowed would consist of all the IP addresses, but 
only one IP address per line:

151.103.50.98
151.103.50.99
151.103.50.100

Same pass rule as the inclusive example.

HTH

-S