Franziska Kunsmann
b06532241b
All checks were successful
bundlewrap/pipeline/head This commit looks good
85 lines
2.3 KiB
Bash
85 lines
2.3 KiB
Bash
#!/bin/bash
|
|
|
|
% if not node.metadata.get('iptables/enabled', True):
|
|
exit 0
|
|
% endif
|
|
|
|
lock_try=0
|
|
while ! mkdir /run/bw-iptables.lock >/dev/null 2>&1
|
|
do
|
|
((lock_try++))
|
|
if (( lock_try == 10 ))
|
|
then
|
|
echo 'FATAL: iptables-enforce: Could not get lock!' >&2
|
|
exit 1
|
|
fi
|
|
sleep 1
|
|
done
|
|
trap 'rmdir /run/bw-iptables.lock' EXIT
|
|
|
|
iptables_both()
|
|
{
|
|
iptables "$@"
|
|
ip6tables "$@"
|
|
}
|
|
|
|
iptables_both -P INPUT DROP
|
|
iptables_both -P OUTPUT ACCEPT
|
|
iptables_both -P FORWARD DROP
|
|
iptables_both -F
|
|
iptables_both -X
|
|
iptables_both -t nat -F
|
|
iptables_both -t nat -X
|
|
iptables_both -t nat -Z
|
|
iptables_both -t filter -F
|
|
iptables_both -t filter -X
|
|
iptables_both -t filter -Z
|
|
iptables_both -t mangle -F
|
|
iptables_both -t mangle -X
|
|
iptables_both -t mangle -Z
|
|
|
|
# Workaround for CVE-2019-11477, CVE-2019-11478 and CVE-2019-11479
|
|
# https://www.openwall.com/lists/oss-security/2019/06/17/5
|
|
# https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-11477.html
|
|
iptables_both -I INPUT -p tcp -m tcpmss --mss 1:500 -j DROP
|
|
|
|
# Dummy rules to make sure the conntrack table(s) will be updated.
|
|
iptables_both -I INPUT -m state --state NEW,ESTABLISHED,RELATED
|
|
iptables_both -I OUTPUT -m state --state NEW,ESTABLISHED,RELATED
|
|
iptables_both -I FORWARD -m state --state NEW,ESTABLISHED,RELATED
|
|
|
|
# open up local loopback
|
|
iptables_both -A INPUT -i lo -j ACCEPT
|
|
|
|
# Set Up counting rules
|
|
% for ip in sorted(ipv4):
|
|
iptables -A INPUT -d ${ip}
|
|
iptables -A OUTPUT -s ${ip}
|
|
% endfor
|
|
|
|
% for ip in sorted(ipv6):
|
|
ip6tables -A INPUT -d ${ip}
|
|
ip6tables -A OUTPUT -s ${ip}
|
|
% endfor
|
|
|
|
iptables -A INPUT -p ICMP --icmp-type timestamp-request -j DROP
|
|
iptables -A INPUT -p ICMP --icmp-type timestamp-reply -j DROP
|
|
# allow ICMP -- answers for IPv4 are covered by conntrack
|
|
iptables -A INPUT -p icmp -j ACCEPT
|
|
|
|
# ICMP6 is used for so many things, we should under no circumstances
|
|
# ignore it and thus should not rely on any conntrack heuristics.
|
|
ip6tables -A INPUT -p ipv6-icmp -j ACCEPT
|
|
|
|
# Allow incoming answers. Install this first (before the larger ruleset
|
|
# from /etc/network/iptables-rules.d/), so that iptables can match/exit
|
|
# early.
|
|
iptables_both -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
|
|
|
|
shopt -s nullglob
|
|
for i in /etc/iptables-rules.d/*
|
|
do
|
|
. "$i"
|
|
done
|
|
|
|
cat /etc/sysctl.d/*.conf /etc/sysctl.conf | sysctl -e -p -
|