Date: Tue, 10 May 2005 05:09:59 -0500 From: "Fafa Hafiz Krantz" <fteg@london.com> To: "Jan Grant" <Jan.Grant@bristol.ac.uk> Cc: questions@freebsd.org Subject: Re: PF RULES! But mine doesn't ... Message-ID: <20050510101000.494C64BEAD@ws1-1.us4.outblaze.com>
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> It's a question of letting DNS traffic _in_ to your nameserver:
>
> pass in on $ext_if inet proto { tcp, udp } \
> from any to ($ext_if) port 53
>=20
> ^^^ that lets the traffic in....
>=20
> pass out on $ext_if inet proto { tcp, udp } \
> from ($ext_if) port 53 to any
>=20
> ^^^ and that lets it back out.
>=20
> If you add the "query-source address * port 53;" to your named.conf
> "options" section, that'll suffice; additionally, since your DNS query
> source port is then predictable, you can drop it from the DNS and NTP
> rule.
Hello again, Jan!
Well, I tried applying what you said now as well as last time you
said it -- but the problem is still there. Unless I uncomment the default
deny policy nothing seems to work. The problem must lie elsewhere in my
ruleset:
int_if=3D"ep0"
ext_if=3D"lnc0"
# *** Options
#
set block-policy drop
# *** Scrub incoming packets
#
scrub in all
# *** NAT
#
nat on $ext_if from $int_if:network to any -> ($ext_if)
rdr on $int_if proto tcp from any to any \
port 21 -> 127.0.0.1 port 8021
# *** Default deny policy
#
# block drop log all
# *** Pass loopback traffic
#
pass quick on { lo0 $int_if }
# *** Outgoing
#
pass out on $ext_if inet proto { tcp, udp, icmp } \
from ($ext_if) to any keep state
# *** DNS
#
pass in on $ext_if inet proto { tcp, udp } \
from any to ($ext_if) port 53
pass out on $ext_if inet proto { tcp, udp } \
from ($ext_if) port 53 to any
# *** NTP
#
pass out on $ext_if inet proto udp \
from ($ext_if) to any port { 53, 123 } keep state
# *** SSH, HTTP and Ident
#
pass in on $ext_if inet proto tcp \
from any to ($ext_if) port { 22, 80, 113 } flags S/SA keep state
# *** Active FTP
#
pass in on $ext_if inet proto tcp \
from port 20 to ($ext_if) user proxy flags S/SA keep state
# *** Private FTP
#
pass in on $ext_if proto tcp \
from any to any port 31337 keep state
pass in on $ext_if proto tcp \
from any to any port 53333:55555
--
Fafa Hafiz Krantz
Research Designer @ http://www.home.no/barbershop
Enlightened @ http://www.home.no/barbershop/smart/sharon.pdf
--=20
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