Handbook section 29.4.1 Enabling IPFW

Wout Decré wout at canodus.be
Tue Mar 22 01:52:26 UTC 2016


On Mon, 2016-03-21 at 17:39 -0400, Chris Jordan wrote:
> On Mon, Mar 21, 2016 at 12:31 PM, Wout Decré <wout at canodus.be> wrote:
> 
> > On Mon, 2016-03-21 at 11:38 -0400, Chris Jordan wrote:
> > > I'm coming back to FreeBSD after many years away and I am setting up a
> > new
> > > system with 10-2-release.
> > >
> > > I was reading through Handbook section 29.4.1 "Enabling IPFW" and it
> > says:
> > > "To enable logging, include this line in
> > > /etc/rc.conf: firewall_logging="YES"".  That didn't seem to work for me,
> > so
> > > I went looking through /etc/rc.firewall, and found it's looking for  a
> > line
> > > like "firewall_logdeny="YES" instead, but it's only checking for that for
> > > the case where firewall_type="workstation".
> >
> > IPFW logging is enabled in /etc/rc.d/ipfw:
> >
> > if checkyesno firewall_logging; then
> >   echo 'Firewall logging enabled.'
> >   sysctl net.inet.ip.fw.verbose=1 >/dev/null
> > fi
> >
> > Should work putting firewall_logging="YES" in rc.conf. By default, logs
> > are written to /var/log/security.
> >
> >
> Ah, I see, thanks.  The difference is that when I set
> "firewall_logdeny="YES"" in rc.conf, then /etc/rc.firewall both sets
> net.inet,ip.fw.verbose=1 and sets a firewall rule for "65500 deny log
> logamount 500 ip from any to any", while if I set "firewall_logging="YES""
> then the firewall rule is "65500 deny ip from any to any" so nothing gets
> logged.  I suppose it's not a problem if you're modifying /etc/rc.firewall
> to set your own rules anyway, but in the simple case it's a bit unclear.
> I've only tried it where "firewall_type="workstation"", the other
> firewall_types appear to have different default logging behavior.

Yes, firewall_logdeny is used by the "workstation" type.
See /etc/defaults/rc.conf for other options as well.

I would suggest to make use of these options instead of
modifying /etc/rc.firewall.

Or, make use of a custom script instead of the firewall types:

firewall_script="/etc/ipfw.rules"

You need to add the "log" keyword for IPFW to log an entry.

An example using a script is available in the Handbook.

Good luck

Wout

> 
> Chris Jordan
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