Merge PR #83 : Remove rc.local and use an iptables systemd service
- 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
parent
80fd8678a6
commit
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@ -23,7 +23,7 @@ if [[ -e /etc/debian_version ]]; then
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OS="debian"
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# Getting the version number, to verify that a recent version of OpenVPN is available
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VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID")
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RCLOCAL='/etc/rc.local'
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IPTABLES='/etc/iptables/iptables.rules'
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SYSCTL='/etc/sysctl.conf'
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if [[ "$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"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.04"' ]]; then
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echo "Your version of Debian/Ubuntu is not supported."
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@ -42,13 +42,11 @@ if [[ -e /etc/debian_version ]]; then
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fi
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elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
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OS=centos
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RCLOCAL='/etc/rc.d/rc.local'
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IPTABLES='/etc/iptables/iptables.rules'
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SYSCTL='/etc/sysctl.conf'
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# Needed for CentOS 7
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chmod +x /etc/rc.d/rc.local
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elif [[ -e /etc/arch-release ]]; then
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OS=arch
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RCLOCAL='/etc/rc.local'
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IPTABLES='/etc/iptables/iptables.rules'
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SYSCTL='/etc/sysctl.d/openvpn.conf'
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else
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echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system"
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@ -89,7 +87,7 @@ if [[ "$IP" = "" ]]; then
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IP=$(wget -qO- ipv4.icanhazip.com)
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fi
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# Get Internet network interface with default route
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NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)')
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NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | head -1)
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if [[ -e /etc/openvpn/server.conf ]]; then
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while :
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@ -162,11 +160,16 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
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fi
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if iptables -L -n | grep -qE 'REJECT|DROP'; then
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sed -i "/iptables -I INPUT -p udp --dport $PORT -j ACCEPT/d" $RCLOCAL
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sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL
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sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL
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if [[ "$PROTOCOL" = 'udp' ]]; then
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iptables -D INPUT -p udp --dport $PORT -j ACCEPT
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else
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iptables -D INPUT -p tcp --dport $PORT -j ACCEPT
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fi
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iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
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iptables-save > $IPTABLES
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fi
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sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
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iptables -t nat -D POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
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iptables-save > $IPTABLES
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if hash sestatus 2>/dev/null; then
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if sestatus | grep "Current mode" | grep -qs "enforcing"; then
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if [[ "$PORT" != '1194' ]]; then
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@ -347,9 +350,73 @@ else
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# Ubuntu >= 16.04 and Debian > 8 have OpenVPN > 2.3.3 without the need of a third party repository.
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# The we install OpenVPN
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apt-get install openvpn iptables openssl wget ca-certificates curl -y
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# Install iptables service
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if [[ ! -e /etc/systemd/system/iptables.service ]]; then
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mkdir /etc/iptables
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iptables-save > /etc/iptables/iptables.rules
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echo "#!/bin/sh
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iptables -F
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iptables -X
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iptables -t nat -F
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iptables -t nat -X
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iptables -t mangle -F
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iptables -t mangle -X
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iptables -P INPUT ACCEPT
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iptables -P FORWARD ACCEPT
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iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
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chmod +x /etc/iptables/flush-iptables.sh
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echo "[Unit]
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Description=Packet Filtering Framework
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DefaultDependencies=no
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Before=network-pre.target
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Wants=network-pre.target
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[Service]
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Type=oneshot
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ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
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ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
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ExecStop=/etc/iptables/flush-iptables.sh
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RemainAfterExit=yes
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[Install]
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WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
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systemctl daemon-reload
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systemctl enable iptables.service
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fi
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elif [[ "$OS" = 'centos' ]]; then
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yum install epel-release -y
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yum install openvpn iptables openssl wget ca-certificates curl -y
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# Install iptables service
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if [[ ! -e /etc/systemd/system/iptables.service ]]; then
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mkdir /etc/iptables
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iptables-save > /etc/iptables/iptables.rules
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echo "#!/bin/sh
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iptables -F
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iptables -X
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iptables -t nat -F
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iptables -t nat -X
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iptables -t mangle -F
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iptables -t mangle -X
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iptables -P INPUT ACCEPT
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iptables -P FORWARD ACCEPT
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iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
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chmod +x /etc/iptables/flush-iptables.sh
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echo "[Unit]
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Description=Packet Filtering Framework
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DefaultDependencies=no
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Before=network-pre.target
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Wants=network-pre.target
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[Service]
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Type=oneshot
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ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
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ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
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ExecStop=/etc/iptables/flush-iptables.sh
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RemainAfterExit=yes
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[Install]
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WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
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systemctl daemon-reload
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systemctl enable iptables.service
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# Disable firewalld to allow iptables to start upon reboot
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systemctl disable firewalld
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fi
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else
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# Else, the distro is ArchLinux
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echo ""
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@ -365,39 +432,21 @@ else
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echo "Ok, bye !"
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exit 4
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fi
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if [[ "$OS" = 'arch' ]]; then
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# Install rc.local
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echo "[Unit]
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Description=/etc/rc.local compatibility
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[Service]
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Type=oneshot
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ExecStart=/etc/rc.local
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RemainAfterExit=yes
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[Install]
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WantedBy=multi-user.target" > /etc/systemd/system/rc-local.service
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chmod +x /etc/rc.local
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systemctl enable rc-local.service
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if ! grep '#!' $RCLOCAL; then
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echo "#!/bin/bash" > $RCLOCAL
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fi
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fi
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# Install dependencies
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pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
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if [[ "$OS" = 'arch' ]]; then
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touch /etc/iptables/iptables.rules # iptables won't start if this file does not exist
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# Install dependencies
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pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
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iptables-save > /etc/iptables/iptables.rules # iptables won't start if this file does not exist
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systemctl daemon-reload
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systemctl enable iptables
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systemctl start iptables
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fi
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fi
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# Find out if the machine uses nogroup or nobody for the permissionless group
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if grep -qs "^nogroup:" /etc/group; then
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NOGROUP=nogroup
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NOGROUP=nogroup
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else
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NOGROUP=nobody
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NOGROUP=nobody
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fi
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# An old version of easy-rsa was available by default in some openvpn packages
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@ -503,15 +552,10 @@ verb 3" >> /etc/openvpn/server.conf
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fi
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# Avoid an unneeded reboot
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echo 1 > /proc/sys/net/ipv4/ip_forward
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# Needed to use rc.local with some systemd distros
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if [[ "$OS" = 'debian' && ! -e $RCLOCAL ]]; then
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echo '#!/bin/sh -e
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exit 0' > $RCLOCAL
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fi
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chmod +x $RCLOCAL
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# Set NAT for the VPN subnet
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iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
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sed -i "1 a\iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE" $RCLOCAL
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# Save persitent iptables rules
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iptables-save > $IPTABLES
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if pgrep firewalld; then
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# We don't use --add-service=openvpn because that would only work with
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# the default port. Using both permanent and not permanent rules to
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@ -537,13 +581,8 @@ verb 3" >> /etc/openvpn/server.conf
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fi
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iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
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iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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if [[ "$PROTOCOL" = 'UDP' ]]; then
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sed -i "1 a\iptables -I INPUT -p udp --dport $PORT -j ACCEPT" $RCLOCAL
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elif [[ "$PROTOCOL" = 'TCP' ]]; then
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sed -i "1 a\iptables -I INPUT -p tcp --dport $PORT -j ACCEPT" $RCLOCAL
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fi
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sed -i "1 a\iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT" $RCLOCAL
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sed -i "1 a\iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" $RCLOCAL
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# Save persitent OpenVPN rules
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iptables-save > $IPTABLES
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fi
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# If SELinux is enabled and a custom port was selected, we need this
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if hash sestatus 2>/dev/null; then
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@ -603,10 +642,10 @@ verb 3" >> /etc/openvpn/server.conf
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echo ""
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echo "Looks like your server is behind a NAT!"
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echo ""
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echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
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echo "then I need to know the address that can be used to access it from outside."
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echo "If that's not the case, just ignore this and leave the next field blank"
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read -p "External IP or domain name: " -e USEREXTERNALIP
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echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
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echo "then I need to know the address that can be used to access it from outside."
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echo "If that's not the case, just ignore this and leave the next field blank"
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read -p "External IP or domain name: " -e USEREXTERNALIP
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if [[ "$USEREXTERNALIP" != "" ]]; then
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IP=$USEREXTERNALIP
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fi
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@ -642,4 +681,4 @@ verb 3" >> /etc/openvpn/client-template.txt
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echo "Your client config is available at $homeDir/$CLIENT.ovpn"
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echo "If you want to add more clients, you simply need to run this script another time!"
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fi
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exit 0;
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exit 0;
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