fwb_pf(1) Firewall Builder fwb_pf(1)NAMEfwb_pf - Policy compiler for OpenBSD packet filter "pf"
SYNOPSISfwb_pf [-vVx] [-d wdir] [-o output.fw] [-i] -f data_file.xml
object_name
DESCRIPTIONfwb_pf is a firewall policy compiler component of Firewall Builder (see
fwbuilder(1)). This compiler generates code for OpenBSD Packet Filter
(pf). Compiler reads objects definitions and firewall description from
the data file specified with "-f" option and generates pf configuration
files and firewall activation script.
All generated files have names that start with the name of the firewall
object. Firewall activation script has extension ".fw" and is simple
shell script that flushes current policy, loads new filter and nat
rules and then activates pf. PF configuration file name starts with
the name of the firewall object, plus "-pf.conf". NAT configuration
file name also starts with the name of the firewall object, plus
"-nat.conf". For example, if firewall object has name "myfirewall",
then compiler will create three files: "myfirewall.fw", "myfirewall-
pf.conf", "myfirewall-nat.conf".
The data file and the name of the firewall objects must be specified on
the command line. Other command line parameters are optional.
OPTIONS-f FILE
Specify the name of the data file to be processed.
-o output.fw
Specify output file name
-d wdir
Specify working directory. Compiler creates firewall acti‐
vation script and PF configuration files in this directory. If
this parameter is missing, then all files will be placed in the
current working directory.
-v Be verbose: compiler prints diagnostic messages when it works.
-V Print version number and quit.
-i When this option is present, the last argument on the command
line is supposed to be firewall object ID rather than its name
-x Generate debugging information while working. This option is
intended for debugging only and may produce lots of cryptic mes‐
sages.
NOTES
Support for PF has been introduced in version 1.0.1 of Firewall Builder
Supported features:
o both pf.conf and nat.conf files are generated
o negation in policy and NAT rules
o grouping in "from", "to" and ports using '{' '}' syntax
o if checkbox "Scrub" is checked in the rule options dialog, and
rule's action is Accept, the compiler generates two (almost)
identical rules: first with action 'scrub' and the second with
action 'pass quick'
o stateful inspection in individual rule can be turned off in rule
options dialog. By default compiler adds "keep state" or "modu‐
late state" to each rule with action 'pass'
o rule options dialog provides a choice of icmp or tcp rst replies
for rules with action "Reject"
o compiler adds flag "allow-opts" if match on ip options is needed
o compiler can generate rules matching on TCP flags
o compiler can generate script adding ip aliases for NAT rules
using addresses that do not belong to any interface of the fire‐
wall
o compiler always adds rule "block quick all" at the very bottom
of the script to ensure "block all by default" policy even if
the policy is empty.
o Address ranges in both policy and NAT
Features that are not supported (yet)
o custom services
What will not be supported (at least not anytime soon)
o policy routing
URL
Firewall Builder home page is located at the following URL:
http://www.fwbuilder.org/
BUGS
Please report bugs using bug tracking system on SourceForge:
http://sourceforge.net/tracker/?group_id=5314&atid=105314
SEE ALSOfwbuilder(1), fwb_ipt(1), fwb_ipf(1)FWBfwb_pf(1)
