Date: Mon, 10 Oct 2011 08:49:01 +0700 From: Victor Sudakov <vas@mpeks.tomsk.su> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: need help with pf configuration Message-ID: <20111010014901.GA3940@admin.sibptus.tomsk.ru> In-Reply-To: <20111009113106.3848a1cb@davenulle.org> References: <CAEZdUGikPzsN=q-m_szHJCGxGT81UGA7Lbd7remTDdiqM5p3og@mail.gmail.com> <20111008235238.GB3136@hs1.VERBENA> <CAEZdUGiV_aXM67S4Yfw-i5tPZcwCWOiKPSFCPBOLkCfWjMmjeQ@mail.gmail.com> <20111009015141.GA60380@hs1.VERBENA> <20111009051554.GA91440@admin.sibptus.tomsk.ru> <20111009083855.0e9879f6@davenulle.org> <20111009073910.GB92531@admin.sibptus.tomsk.ru> <20111009113106.3848a1cb@davenulle.org>
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Patrick Lamaiziere wrote: > > > > > I need no details, just a general hint how to setup such security > > > > levels, preferably independent of actual IP addressses behind the > > > > interfaces (a :network macro is not always sufficient). > > > > > > You may use urpf-failed instead :network > > > urpf-failed: Any source address that fails a unicast reverse path > > > forwarding (URPF) check, i.e. packets coming in on an interface > > > other than that which holds the route back to the packet's source > > > address. > > > > Excuse me, I do not see how this is relevant to my question (allowing > > traffic to be initiated from a more secure interface to a less secure > > interface and not vice versa). > > Sorry, you can't do this with pf, ipf or ipfw (the 3 firewalls in > FreeBSD). There is no concept of security level at all, you must specify > on each interface the traffic allowed (in input and output). Actually you can with ipfw. The following concise ruleset should do it: check-state permit ip from any to any recv INSIDE xmit DMZ keep-state permit ip from any to any recv INSIDE xmit OUTSIDE keep-state permit ip from any to any recv DMZ xmit OUTSIDE keep-state -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:sudakov@sibptus.tomsk.ru
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