PF rule question

[Uroš Gruber]

Hi Darren,

I thought about anchors and also do some test with them. But the problem
I'm seeing is that I need to get list of all rules for all active jails
when starting or stopping a jail. At least I don't see a way to add or
remove the rule from anchor except to replace all anchor rules.

Am I missing something here or that was your idea?

Regards

Uros


On 14 October 2013 02:59, Darren Pilgrim <list_freebsd at bluerosetech.com>wrote:

> On 10/9/2013 3:54 PM, Uroš Gruber wrote:
>
>> Hi,
>>
>> I'm strugling to complete my pf firewall configuration with a bit more
>> optimized rules.
>>
>> I have a few hudreds jails set up on network from 172.16.1.0 to
>> 172.16.10.0
>>
>> My goal is to deny access between jails, but allow a few exceptions for
>> example all jails can connect to jails from 172.16.1.0 to 172.16.1.64.
>>
>> I've accomplished this with rules like
>>
>> pass on lo0 from $jailnet to 172.16.1.0/26
>> pass on lo0 from 172.16.1.1 to 172.16.1.1
>>
>> I would like to know if there is a better way to write such rules mostly
>> because all that jails are very dynamic in terms of
>> runing,stoping/destroying etc. and also IP aliases are removed and added
>> back continuously.
>>
>
> Use an anchor for the "pass on lo0 from X to X" rules and a table for the
> jailnet.  Then have your jail provisioning scripts manipulate the table and
> anchor as jails come up and down.
>
> In /etc/pf.conf:
>
>         table <jailnet> persist
>         pass on lo0 from <jailnet> to 172.16.1.0/26
>         anchor <jails>
>
> When bringing up a jail:
>
> # pfctl -t jailnet -T add 192.0.2.65
> # pfctl -a jails -f - <<<"pass on lo0 from 192.0.2.65 to 192.0.2.65"
>
> When taking down a jail:
>
> # pfctl -t jailnet -T delete 192.0.2.65
> # pfctl -a jails -f - <<<"block on lo0 from 192.0.2.65 to 192.0.2.65"
> # pfctl -k 192.0.2.65
>
> You'll need to reload the table and anchor rules on a system restart. You
> can do that with rules in /etc/pf.conf:
>
>         table <jailnet> persist /path/to/jailnet_address_list
>         load anchor jails from /path/to/jails_rules_list
>
> or directly using pfctl:
>
> # pfctl -t jailnet -Ta -f /path/to/jailnet_address_list
> # pfctl -a jails -f /path/to/jails_rules_list
>