nested pf.conf macros

Many of my FreeBSD servers are not behind a firewall.  They sit naked on the Internet, and I protect their services with PF.  I have several “trusted” networks, and want to use them in macros.  Keeping track of serveral networks in a macro is error-prone, however.  Previously, I used macros like this one:

#lucas_house=10.20.20.0/28
#main_office=192.168.1.0/25
#monitor=17.16.1.1
#boss_house=10.20.30.0/24
mgmt_networks ="{ 10.20.20.0/28, 192.168.1.0/25, 172.16.1.1, 10.20.30.0/24 "}"

This meant entering each IP address twice.  Complicated numbers hurt my feeble brain, and the result is errors.  Entering each address multiple times is begging for an error.  I found that you can nest macros, however, with careful placement of single and double quotes.

lucas_house='"10.20.20.0/28"'
main_office='"192.168.1.0/25"'
monitor='"17.16.1.1"'
boss_house='"10.20.30.0/24"'
mgmt_networks ="{" $lucas_house $main_office $monitor $boss_house "}"

Note that each address is in single quotes (‘), enclosed by double quotes (“).  In the mgmt_networks macro, put double quotes around the enclosing brackets. This is in the man page example, but you have to look very closely at it.

I can then allow SSH, SNMP, SIP, etc, from my management networks to the server, and my addresses will be consistent.

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2 Replies to “nested pf.conf macros”

  1. I usually do it this way:

    OPENID=”10.0.0.1″
    ADS=”10.0.0.2″
    DRUPAL=”10.0.0.4″

    table { $MYSELF, $SME, $PAPERSPGCON, $PAPERSBSDCAN, $CVS, $NUTS, $REGISTER, $OPENID, $ADS, $DRUPAL }

    No tricky quotes.

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