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Merge remote-tracking branch 'ms/iptables-conntrack' into next

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This commit is contained in:
Michael Tremer
2016-01-22 00:54:14 +00:00
parent 41410d197b 6b86307cac
commit 8a1a3bf393
15 changed files with 122 additions and 21 deletions
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85
src/initscripts/init.d/firewall
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@@ -21,9 +21,11 @@ iptables_init() {
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -t raw -F
iptables -X
iptables -t nat -X
iptables -t mangle -X
iptables -t raw -X
# Set up policies
iptables -P INPUT DROP
@@ -84,10 +86,71 @@ iptables_init() {
iptables -A INPUT -p tcp -j BADTCP
iptables -A FORWARD -p tcp -j BADTCP
# Connection tracking chain
# Connection tracking chains
iptables -N CONNTRACK
iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT
iptables -A CONNTRACK -m conntrack --ctstate INVALID -j DROP
iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT
iptables -t raw -N CONNTRACK
iptables -t raw -A PREROUTING -j CONNTRACK
# Conntrack helpers (https://home.regit.org/netfilter-en/secure-use-of-helpers/)
# SIP
if [ "${CONNTRACK_SIP}" = "on" ]; then
iptables -A CONNTRACK -m conntrack --ctstate RELATED \
-m helper --helper sip -j ACCEPT
for proto in udp tcp; do
iptables -t raw -A CONNTRACK -p "${proto}" --dport 5060 -j CT --helper sip
done
fi
# H.323
if [ "${CONNTRACK_H323}" = "on" ]; then
iptables -A CONNTRACK -m conntrack --ctstate RELATED \
-m helper --helper h323 -j ACCEPT
# Gatekeeper RAS
iptables -t raw -A CONNTRACK -p udp --dport 1719 -j CT --helper RAS
# Q.931
iptables -t raw -A CONNTRACK -p tcp --dport 1720 -j CT --helper Q.931
fi
# FTP
if [ "${CONNTRACK_FTP}" = "on" ]; then
iptables -A CONNTRACK -m conntrack --ctstate RELATED \
-m helper --helper ftp -p tcp --dport 1024: -j ACCEPT
iptables -t raw -A CONNTRACK -p tcp --dport 21 -j CT --helper ftp
fi
# PPTP
if [ "${CONNTRACK_PPTP}" = "on" ]; then
iptables -A CONNTRACK -m conntrack --ctstate RELATED \
-m helper --helper pptp -j ACCEPT
iptables -t raw -A CONNTRACK -p udp --dport 1723 -j CT --helper pptp
fi
# TFTP
if [ "${CONNTRACK_TFTP}" = "on" ]; then
iptables -A CONNTRACK -m conntrack --ctstate RELATED \
-m helper --helper tftp -j ACCEPT
iptables -t raw -A CONNTRACK -p udp --dport 69 -j CT --helper tftp
fi
# IRC
if [ "${CONNTRACK_IRC}" = "on" ]; then
iptables -A CONNTRACK -m conntrack --ctstate RELATED \
-m helper --helper irc -j ACCEPT
iptables -t raw -A CONNTRACK -p tcp --dport 6667 -j CT --helper irc
fi
# Amanda
if [ "${CONNTRACK_AMANDA}" = "on" ]; then
iptables -A CONNTRACK -m conntrack --ctstate RELATED \
-m helper --helper amanda -j ACCEPT
iptables -t raw -A CONNTRACK -p tcp -j CT --helper amanda
fi
# Fix for braindead ISP's
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
@@ -400,24 +463,6 @@ iptables_red_down() {
# See how we were called.
case "$1" in
start)
boot_mesg "Loading firewall modules into the kernel"
modprobe iptable_nat || failed=1
for i in $(find /lib/modules/$(uname -r) -name nf_conntrack*); do
modprobe $(basename $i | cut -d. -f1) || failed=1
done
for i in $(find /lib/modules/$(uname -r) -name nf_nat*); do
modprobe $(basename $i | cut -d. -f1) || failed=1
done
(exit ${failed})
evaluate_retval
if [ -e /var/ipfire/main/disable_nf_sip ]; then
rmmod nf_nat_sip
rmmod nf_conntrack_sip
rmmod nf_nat_h323
rmmod nf_conntrack_h323
fi
boot_mesg "Setting up firewall"
iptables_init
evaluate_retval