Date: Sat, 29 Mar 2003 12:43:52 +1100 From: Carey Nairn <Carey.Nairn@dpac.tas.gov.au> To: freebsd-ipfw@freebsd.org Subject: IPFW and ntpd Message-ID: <5.1.0.14.0.20030329123307.040e9880@mail.cpn.homeip.net>
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I am having a problem with getting ntpd to work with ipfw. Using my simple
firewall setup (based on the default /etc/rc.firewall), I get the following
error when I start ntpd:
ntpd_initres[23825]: send to NTP server failed: Permission denied
If I set my firewall to OPEN, ntpd works just fine.
My firewall configuration is executed whenever my PPP (ADSL) connection is
established and is as follows:
#!/bin/sh
fwcmd="/sbin/ipfw"
${fwcmd} -f flush
oif="tun0"
oip=`/sbin/ifconfig tun0 | grep -v grep | grep "inet " | awk '{ print $2 }'`
onet=$oip
omask="255.0.0.0"
iif="fxp0"
inet="172.16.1.0"
imask="255.255.255.0"
iip="172.16.1.4"
${fwcmd} add pass all from ${iip} to ${inet}:${imask}
${fwcmd} add pass all from ${inet}:${imask} to ${iip}
# Deny incoming ICMP requests
${fwcmd} add deny log icmp from any to any in via ${oif} icmptypes 8
# Allow outgoing ICMP requests
${fwcmd} add pass icmp from any to any out via ${oif} icmptypes 8
${fwcmd} add pass icmp from any to any in via ${oif} icmptypes 0
# Stop spoofing
${fwcmd} add deny all from ${inet}:${imask} to any in via ${oif}
${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif}
# Stop draft-manning-dsua-01.txt nets on the outside interface
${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif}
${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif}
${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif}
${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif}
${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif}
${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif}
${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif}
${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif}
${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif}
${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif}
# Allow TCP through if setup succeeded
${fwcmd} add pass tcp from any to any established
# Allow IP fragments to pass through
${fwcmd} add pass all from any to any frag
# Allow access to ssh
${fwcmd} add pass tcp from any to ${oip} 22 setup
${fwcmd} add pass tcp from any to ${oip} 22
# Allow setup of incoming email
${fwcmd} add pass tcp from any to ${oip} 25 setup
# Allow access to our WWW
${fwcmd} add pass tcp from any to ${oip} 80 setup
# Reject&Log all setup of incoming connections from the outside
${fwcmd} add deny log tcp from any to any in via ${oif} setup
# Allow setup of any other TCP connection
${fwcmd} add pass tcp from any to any setup
# Allow DNS queries out in the world
${fwcmd} add pass udp from any 53 to ${oip}
${fwcmd} add pass udp from ${oip} to any 53
# Allow NTP queries out in the world
${fwcmd} add pass udp from ${oip} to any 123 keep-state
any thoughts on why the ntp rule fails?
thanks
Carey Nairn
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