4 [ "$1" = "configure" ] || exit 0
5 [ "$DEBIAN_SCRIPT_DEBUG" ] && set -vx
7 # remove old iptables init script
8 update-rc.d -f iptables remove >/dev/null 2>&1 || true
9 update-rc.d -f iptables-cn remove >/dev/null 2>&1 || true
11 # check if old default file exists and delete it
12 if [ -e /etc/default/iptables-cn ]; then
13 rm -f /etc/default/iptables-cn
15 if [ -e /etc/default/iptables ]; then
16 rm -f /etc/default/iptables
19 # check to see if fail2ban is installed
20 if dpkg-query -f '${Status}' -W fail2ban | grep -q installed; then
21 echo "CN: Detected Fail2Ban installation, will remove SSH bruteforce rules by default"
22 iptables -D SSH_Brute_Force -m recent ! --rcheck --seconds 90 \
23 --hitcount 3 --name SSH --rsource \
24 -j RETURN >/dev/null 2>&1 || true
25 iptables -D SSH_Brute_Force -p tcp -j REJECT \
26 --reject-with icmp-port-unreachable >/dev/null 2>&1 || true
27 iptables -D INPUT -p tcp -m tcp --dport 22 -m state \
28 --state NEW -m recent --set --name SSH --rsource \
29 -j SSH_Brute_Force >/dev/null 2>&1 || true
30 iptables -X SSH_Brute_Force >/dev/null 2>&1 || true
32 echo "CN: Saving current Netfilter rules to /etc/iptables/rules.v4"
33 iptables-save > /etc/iptables/rules.v4
35 # check if there is any default netfilter policy and install default SSH
36 # REJECT recent if there is none..
37 # also, save current set of rules into active and inactive configuration
38 if [ ! -e /etc/iptables/rules.v4 ]; then
39 if ! iptables-save | grep '^-' >/dev/null; then
40 echo "CN: Netfilter rules empty: importing SSH bruteforce rules"
41 /usr/share/doc/iptables-cn/examples/ssh-bruteforce \
42 1>/dev/null 2>&1 || true
44 echo "CN: Saving current Netfilter rules to /etc/iptables/rules.v4"
45 iptables-save > /etc/iptables/rules.v4
49 # dh_installdeb will replace this with shell code automatically
50 # generated by other debhelper scripts.