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Improve iptables configuration

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See #464.
This commit is contained in:
Nyr 2018-06-08 17:46:09 +02:00
parent b3953963ba
commit fdc2bfbdac
1 changed files with 11 additions and 21 deletions
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32
openvpn-install.sh
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@ -25,11 +25,9 @@ fi
if [[ -e /etc/debian_version ]]; then
OS=debian
GROUPNAME=nogroup
RCLOCAL='/etc/rc.local'
elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
OS=centos
GROUPNAME=nobody
RCLOCAL='/etc/rc.d/rc.local'
else
echo "Looks like you aren't running this installer on Debian, Ubuntu or CentOS"
exit
@ -133,16 +131,12 @@ if [[ -e /etc/openvpn/server.conf ]]; then
firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
else
IP=$(grep 'iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to ' $RCLOCAL | cut -d " " -f 14)
IP=$(grep 'iptables -t nat -C POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to ' /etc/openvpn/iptables-init | cut -d " " -f 14)
iptables -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 ! -d 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
if iptables -L -n | grep -qE '^ACCEPT'; then
iptables -D INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
iptables -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
sed -i "/iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT/d" $RCLOCAL
sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL
sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL
fi
fi
if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$PORT" != '1194' ]]; then
@ -321,26 +315,22 @@ crl-verify crl.pem" >> /etc/openvpn/server.conf
firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
else
# Needed to use rc.local with some systemd distros
if [[ "$OS" = 'debian' && ! -e $RCLOCAL ]]; then
echo '#!/bin/sh -e
exit 0' > $RCLOCAL
fi
chmod +x $RCLOCAL
# Set NAT for the VPN subnet
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
# iptables-init checks if the rules already exist, so duplicates aren't
# added when iptables-init is called after an OpenVPN service restart.
echo '#!/bin/bash' > /etc/openvpn/iptables-init
echo "iptables -t nat -C POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP || iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP" >> /etc/openvpn/iptables-init
if iptables -L -n | grep -qE '^(REJECT|DROP)'; then
# If iptables has at least one REJECT rule, we asume this is needed.
# Not the best approach but I can't think of other and this shouldn't
# cause problems.
iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
sed -i "1 a\iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT" $RCLOCAL
sed -i "1 a\iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT" $RCLOCAL
sed -i "1 a\iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" $RCLOCAL
echo "iptables -C INPUT -p $PROTOCOL --dport $PORT -j ACCEPT || iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
iptables -C FORWARD -s 10.8.0.0/24 -j ACCEPT || iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
iptables -C FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT || iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" >> /etc/openvpn/iptables-init
fi
chmod +x /etc/openvpn/iptables-init
echo "script-security 2
up /etc/openvpn/iptables-init" >> /etc/openvpn/server.conf
fi
# If SELinux is enabled and a custom port was selected, we need this
if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$PORT" != '1194' ]]; then