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Merge PR #83 : Remove rc.local and use an iptables systemd service

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- Install iptables systemd service for Debian, Ubuntu and CentOS
- Fix iptables install for ArcLinux
- Remove the use rc.local file
- Remove all iptables rules when removing openvpn (cf. #60 )
This commit is contained in:
Angristan 2017-11-12 22:56:02 +01:00
parent 80fd8678a6
commit f47fc795d5
1 changed files with 93 additions and 54 deletions
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147
openvpn-install.sh
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@ -23,7 +23,7 @@ if [[ -e /etc/debian_version ]]; then
OS="debian" OS="debian"
# Getting the version number, to verify that a recent version of OpenVPN is available # Getting the version number, to verify that a recent version of OpenVPN is available
VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID") VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID")
RCLOCAL='/etc/rc.local' IPTABLES='/etc/iptables/iptables.rules'
SYSCTL='/etc/sysctl.conf' SYSCTL='/etc/sysctl.conf'
if [[ "$VERSION_ID" != 'VERSION_ID="7"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="8"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="9"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="12.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="14.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.10"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.04"' ]]; then if [[ "$VERSION_ID" != 'VERSION_ID="7"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="8"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="9"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="12.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="14.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.10"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.04"' ]]; then
echo "Your version of Debian/Ubuntu is not supported." echo "Your version of Debian/Ubuntu is not supported."
@ -42,13 +42,11 @@ if [[ -e /etc/debian_version ]]; then
fi fi
elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
OS=centos OS=centos
RCLOCAL='/etc/rc.d/rc.local' IPTABLES='/etc/iptables/iptables.rules'
SYSCTL='/etc/sysctl.conf' SYSCTL='/etc/sysctl.conf'
# Needed for CentOS 7
chmod +x /etc/rc.d/rc.local
elif [[ -e /etc/arch-release ]]; then elif [[ -e /etc/arch-release ]]; then
OS=arch OS=arch
RCLOCAL='/etc/rc.local' IPTABLES='/etc/iptables/iptables.rules'
SYSCTL='/etc/sysctl.d/openvpn.conf' SYSCTL='/etc/sysctl.d/openvpn.conf'
else else
echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system" echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system"
@ -89,7 +87,7 @@ if [[ "$IP" = "" ]]; then
IP=$(wget -qO- ipv4.icanhazip.com) IP=$(wget -qO- ipv4.icanhazip.com)
fi fi
# Get Internet network interface with default route # Get Internet network interface with default route
NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)') NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | head -1)
if [[ -e /etc/openvpn/server.conf ]]; then if [[ -e /etc/openvpn/server.conf ]]; then
while : while :
@ -162,11 +160,16 @@ if [[ -e /etc/openvpn/server.conf ]]; then
firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24 firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
fi fi
if iptables -L -n | grep -qE 'REJECT|DROP'; then if iptables -L -n | grep -qE 'REJECT|DROP'; then
sed -i "/iptables -I INPUT -p udp --dport $PORT -j ACCEPT/d" $RCLOCAL if [[ "$PROTOCOL" = 'udp' ]]; then
sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL iptables -D INPUT -p udp --dport $PORT -j ACCEPT
sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL else
iptables -D INPUT -p tcp --dport $PORT -j ACCEPT
fi
iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
iptables-save > $IPTABLES
fi fi
sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL iptables -t nat -D POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
iptables-save > $IPTABLES
if hash sestatus 2>/dev/null; then if hash sestatus 2>/dev/null; then
if sestatus | grep "Current mode" | grep -qs "enforcing"; then if sestatus | grep "Current mode" | grep -qs "enforcing"; then
if [[ "$PORT" != '1194' ]]; then if [[ "$PORT" != '1194' ]]; then
@ -347,9 +350,73 @@ else
# Ubuntu >= 16.04 and Debian > 8 have OpenVPN > 2.3.3 without the need of a third party repository. # Ubuntu >= 16.04 and Debian > 8 have OpenVPN > 2.3.3 without the need of a third party repository.
# The we install OpenVPN # The we install OpenVPN
apt-get install openvpn iptables openssl wget ca-certificates curl -y apt-get install openvpn iptables openssl wget ca-certificates curl -y
# Install iptables service
if [[ ! -e /etc/systemd/system/iptables.service ]]; then
mkdir /etc/iptables
iptables-save > /etc/iptables/iptables.rules
echo "#!/bin/sh
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
chmod +x /etc/iptables/flush-iptables.sh
echo "[Unit]
Description=Packet Filtering Framework
DefaultDependencies=no
Before=network-pre.target
Wants=network-pre.target
[Service]
Type=oneshot
ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
ExecStop=/etc/iptables/flush-iptables.sh
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
systemctl daemon-reload
systemctl enable iptables.service
fi
elif [[ "$OS" = 'centos' ]]; then elif [[ "$OS" = 'centos' ]]; then
yum install epel-release -y yum install epel-release -y
yum install openvpn iptables openssl wget ca-certificates curl -y yum install openvpn iptables openssl wget ca-certificates curl -y
# Install iptables service
if [[ ! -e /etc/systemd/system/iptables.service ]]; then
mkdir /etc/iptables
iptables-save > /etc/iptables/iptables.rules
echo "#!/bin/sh
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
chmod +x /etc/iptables/flush-iptables.sh
echo "[Unit]
Description=Packet Filtering Framework
DefaultDependencies=no
Before=network-pre.target
Wants=network-pre.target
[Service]
Type=oneshot
ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
ExecStop=/etc/iptables/flush-iptables.sh
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
systemctl daemon-reload
systemctl enable iptables.service
# Disable firewalld to allow iptables to start upon reboot
systemctl disable firewalld
fi
else else
# Else, the distro is ArchLinux # Else, the distro is ArchLinux
echo "" echo ""
@ -365,39 +432,21 @@ else
echo "Ok, bye !" echo "Ok, bye !"
exit 4 exit 4
fi fi
if [[ "$OS" = 'arch' ]]; then if [[ "$OS" = 'arch' ]]; then
# Install rc.local # Install dependencies
echo "[Unit] pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
Description=/etc/rc.local compatibility iptables-save > /etc/iptables/iptables.rules # iptables won't start if this file does not exist
systemctl daemon-reload
[Service]
Type=oneshot
ExecStart=/etc/rc.local
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target" > /etc/systemd/system/rc-local.service
chmod +x /etc/rc.local
systemctl enable rc-local.service
if ! grep '#!' $RCLOCAL; then
echo "#!/bin/bash" > $RCLOCAL
fi
fi
# Install dependencies
pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
if [[ "$OS" = 'arch' ]]; then
touch /etc/iptables/iptables.rules # iptables won't start if this file does not exist
systemctl enable iptables systemctl enable iptables
systemctl start iptables systemctl start iptables
fi fi
fi fi
# Find out if the machine uses nogroup or nobody for the permissionless group # Find out if the machine uses nogroup or nobody for the permissionless group
if grep -qs "^nogroup:" /etc/group; then if grep -qs "^nogroup:" /etc/group; then
NOGROUP=nogroup NOGROUP=nogroup
else else
NOGROUP=nobody NOGROUP=nobody
fi fi
# An old version of easy-rsa was available by default in some openvpn packages # An old version of easy-rsa was available by default in some openvpn packages
@ -503,15 +552,10 @@ verb 3" >> /etc/openvpn/server.conf
fi fi
# Avoid an unneeded reboot # Avoid an unneeded reboot
echo 1 > /proc/sys/net/ipv4/ip_forward echo 1 > /proc/sys/net/ipv4/ip_forward
# 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 # Set NAT for the VPN subnet
iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
sed -i "1 a\iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE" $RCLOCAL # Save persitent iptables rules
iptables-save > $IPTABLES
if pgrep firewalld; then if pgrep firewalld; then
# We don't use --add-service=openvpn because that would only work with # We don't use --add-service=openvpn because that would only work with
# the default port. Using both permanent and not permanent rules to # the default port. Using both permanent and not permanent rules to
@ -537,13 +581,8 @@ verb 3" >> /etc/openvpn/server.conf
fi fi
iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
if [[ "$PROTOCOL" = 'UDP' ]]; then # Save persitent OpenVPN rules
sed -i "1 a\iptables -I INPUT -p udp --dport $PORT -j ACCEPT" $RCLOCAL iptables-save > $IPTABLES
elif [[ "$PROTOCOL" = 'TCP' ]]; then
sed -i "1 a\iptables -I INPUT -p tcp --dport $PORT -j ACCEPT" $RCLOCAL
fi
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" $RCLOCAL
fi fi
# If SELinux is enabled and a custom port was selected, we need this # If SELinux is enabled and a custom port was selected, we need this
if hash sestatus 2>/dev/null; then if hash sestatus 2>/dev/null; then
@ -603,10 +642,10 @@ verb 3" >> /etc/openvpn/server.conf
echo "" echo ""
echo "Looks like your server is behind a NAT!" echo "Looks like your server is behind a NAT!"
echo "" echo ""
echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router)," echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
echo "then I need to know the address that can be used to access it from outside." echo "then I need to know the address that can be used to access it from outside."
echo "If that's not the case, just ignore this and leave the next field blank" echo "If that's not the case, just ignore this and leave the next field blank"
read -p "External IP or domain name: " -e USEREXTERNALIP read -p "External IP or domain name: " -e USEREXTERNALIP
if [[ "$USEREXTERNALIP" != "" ]]; then if [[ "$USEREXTERNALIP" != "" ]]; then
IP=$USEREXTERNALIP IP=$USEREXTERNALIP
fi fi
@ -642,4 +681,4 @@ verb 3" >> /etc/openvpn/client-template.txt
echo "Your client config is available at $homeDir/$CLIENT.ovpn" echo "Your client config is available at $homeDir/$CLIENT.ovpn"
echo "If you want to add more clients, you simply need to run this script another time!" echo "If you want to add more clients, you simply need to run this script another time!"
fi fi
exit 0; exit 0;