mirror of
https://github.com/namibia/openvpn-install.git
synced 2024-12-22 23:08:55 +00:00
852 lines
26 KiB
Bash
852 lines
26 KiB
Bash
#!/bin/bash
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# Secure OpenVPN server installer for Debian, Ubuntu, CentOS and Fedora
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# https://github.com/angristan/openvpn-install
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function isRoot () {
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if [ "$EUID" -ne 0 ]; then
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return 1
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fi
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}
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function tunAvailable () {
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if [ ! -e /dev/net/tun ]; then
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return 1
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fi
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}
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function checkOS () {
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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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source /etc/os-release
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if [[ ! $VERSION_ID =~ (8|9|16.04|17.10|18.04) ]]; then
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echo "⚠️ Your version of Debian/Ubuntu is not supported."
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echo ""
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echo "However, if you're using Debian unstable/testing, or Ubuntu beta, then you can continue."
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echo "Keep in mind they are not supported, though."
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echo ""
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while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
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read -rp "Continue? [y/n]: " -e CONTINUE
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done
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if [[ "$CONTINUE" = "n" ]]; then
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echo "Ok, bye!"
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exit 1
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fi
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fi
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elif [[ -e /etc/fedora-release ]]; then
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OS=fedora
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elif [[ -e /etc/centos-release ]]; then
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if ! grep -qs "^CentOS Linux release 7" /etc/centos-release; then
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echo "Your version of CentOS is not supported."
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echo "The script only support CentOS 7."
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echo ""
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unset CONTINUE
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while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
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read -rp "Continue anyway? [y/n]: " -e CONTINUE
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done
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if [[ "$CONTINUE" = "n" ]]; then
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echo "Ok, bye!"
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exit 1
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fi
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fi
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OS=centos
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else
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echo "Looks like you aren't running this installer on a Debian, Ubuntu, Fedora or CentOS system"
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exit 1
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fi
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}
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function initialCheck () {
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if ! isRoot; then
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echo "Sorry, you need to run this as root"
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exit 1
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fi
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if ! tunAvailable; then
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echo "TUN is not available"
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exit 1
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fi
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checkOS
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}
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function installUnbound () {
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if [[ ! -e /etc/unbound/unbound.conf ]]; then
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if [[ "$OS" = "debian" ]]; then
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apt-get install -y unbound
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# Configuration
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echo 'interface: 10.8.0.1
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access-control: 10.8.0.1/24 allow
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hide-identity: yes
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hide-version: yes
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use-caps-for-id: yes
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prefetch: yes' >> /etc/unbound/unbound.conf
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elif [[ "$OS" = "centos" ]]; then
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yum install -y unbound
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# Configuration
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sed -i 's|# interface: 0.0.0.0$|interface: 10.8.0.1|' /etc/unbound/unbound.conf
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sed -i 's|# access-control: 127.0.0.0/8 allow|access-control: 10.8.0.1/24 allow|' /etc/unbound/unbound.conf
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sed -i 's|# hide-identity: no|hide-identity: yes|' /etc/unbound/unbound.conf
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sed -i 's|# hide-version: no|hide-version: yes|' /etc/unbound/unbound.conf
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sed -i 's|use-caps-for-id: no|use-caps-for-id: yes|' /etc/unbound/unbound.conf
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elif [[ "$OS" = "fedora" ]]; then
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dnf install -y unbound
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# Configuration
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sed -i 's|# interface: 0.0.0.0$|interface: 10.8.0.1|' /etc/unbound/unbound.conf
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sed -i 's|# access-control: 127.0.0.0/8 allow|access-control: 10.8.0.1/24 allow|' /etc/unbound/unbound.conf
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sed -i 's|# hide-identity: no|hide-identity: yes|' /etc/unbound/unbound.conf
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sed -i 's|# hide-version: no|hide-version: yes|' /etc/unbound/unbound.conf
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sed -i 's|# use-caps-for-id: no|use-caps-for-id: yes|' /etc/unbound/unbound.conf
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fi
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if [[ ! "$OS" =~ (fedora|centos) ]];then
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# DNS Rebinding fix
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echo "private-address: 10.0.0.0/8
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private-address: 172.16.0.0/12
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private-address: 192.168.0.0/16
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private-address: 169.254.0.0/16
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private-address: fd00::/8
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private-address: fe80::/10
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private-address: 127.0.0.0/8
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private-address: ::ffff:0:0/96" >> /etc/unbound/unbound.conf
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fi
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else # Unbound is already installed
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echo 'include: /etc/unbound/openvpn.conf' >> /etc/unbound/unbound.conf
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# Add Unbound 'server' for the OpenVPN subnet
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echo 'server:
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interface: 10.8.0.1
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access-control: 10.8.0.1/24 allow
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hide-identity: yes
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hide-version: yes
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use-caps-for-id: yes
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prefetch: yes
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private-address: 10.0.0.0/8
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private-address: 172.16.0.0/12
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private-address: 192.168.0.0/16
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private-address: 169.254.0.0/16
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private-address: fd00::/8
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private-address: fe80::/10
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private-address: 127.0.0.0/8
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private-address: ::ffff:0:0/96' > /etc/unbound/openvpn.conf
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fi
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systemctl enable unbound
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systemctl restart unbound
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}
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function installOpenVPN () {
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echo "Welcome to the OpenVPN installer!"
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echo "The git repository is available at: https://github.com/angristan/openvpn-install"
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echo ""
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echo "I need to ask you a few questions before starting the setup."
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echo "You can leave the default options and just press enter if you are ok with them."
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echo ""
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echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
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echo "Unless your server is behind NAT, it should be your public IPv4 address."
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# Detect public IPv4 address and pre-fill for the user
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IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
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read -rp "IP address: " -e -i "$IP" IP
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# If $IP is a private IP address, the server must be behind NAT
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if echo "$IP" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
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echo ""
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echo "It seems this server is behind NAT. What is its public IPv4 address?"
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echo "We need it for the clients to connect to the server."
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until [[ "$PUBLICIP" =~ ^((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])$ ]];do
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read -rp "Public IPv4 address: " -e PUBLICIP
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done
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fi
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echo ""
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echo "Checking for IPv6 connectivity..."
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echo ""
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if ping -c4 ipv6.google.com > /dev/null 2>&1; then
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echo "Your host appears to have IPv6 connectivity."
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SUGGESTION="y"
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else
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echo "Your host does not appear to have IPv6 connectivity."
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SUGGESTION="n"
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fi
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echo ""
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# Ask the user if they want to enable IPv6 regardless its availability.
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while [[ $IPV6_SUPPORT != "y" && $IPV6_SUPPORT != "n" ]]; do
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read -rp "Do you want to enable IPv6 support (NAT)? [y/n]: " -e -i $SUGGESTION IPV6_SUPPORT
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done
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echo ""
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echo "What port do you want OpenVPN to listen to?"
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echo " 1) Default: 1194"
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echo " 2) Custom"
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echo " 3) Random [49152-65535]"
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until [[ "$PORT_CHOICE" =~ ^[1-3]$ ]]; do
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read -rp "Port choice [1-3]: " -e -i 1 PORT_CHOICE
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done
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case $PORT_CHOICE in
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1)
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PORT="1194"
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;;
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2)
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until [[ "$PORT" =~ ^[0-9]+$ ]] && [ "$PORT" -ge 1 ] && [ "$PORT" -le 65535 ]; do
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read -rp "Custom port [1-65535]: " -e -i 1194 PORT
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done
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;;
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3)
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# Generate random number within private ports range
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PORT=$(shuf -i49152-65535 -n1)
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echo "Random Port: $PORT"
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;;
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esac
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echo ""
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echo "What protocol do you want OpenVPN to use?"
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echo "UDP is faster. Unless it is not available, you shoudn't use TCP."
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echo " 1) UDP"
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echo " 2) TCP"
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until [[ "$PROTOCOL_CHOICE" =~ ^[1-2] ]]; do
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read -rp "Protocol [1-2]: " -e -i 1 PROTOCOL_CHOICE
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done
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case $PROTOCOL_CHOICE in
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1)
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PROTOCOL="udp"
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;;
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2)
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PROTOCOL="tcp"
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;;
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esac
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echo ""
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echo "What DNS resolvers do you want to use with the VPN?"
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echo " 1) Current system resolvers (from /etc/resolv.conf)"
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echo " 2) Self-hosted DNS Resolver (Unbound)"
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echo " 3) Cloudflare (Anycast: worldwide)"
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echo " 4) Quad9 (Anycast: worldwide)"
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echo " 5) FDN (France)"
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echo " 6) DNS.WATCH (Germany)"
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echo " 7) OpenDNS (Anycast: worldwide)"
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echo " 8) Google (Anycast: worldwide)"
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echo " 9) Yandex Basic (Russia)"
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echo " 10) AdGuard DNS (Russia)"
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until [[ "$DNS" =~ ^[0-9]+$ ]] && [ "$DNS" -ge 1 ] && [ "$DNS" -le 10 ]; do
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read -rp "DNS [1-10]: " -e -i 3 DNS
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if [[ $DNS == 2 ]] && [[ -e /etc/unbound/unbound.conf ]]; then
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echo ""
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echo "Unbound is already installed."
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echo "You can allow the script to configure it in order to use it from your OpenVPN clients"
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echo "We will simply add a second server to /etc/unbound/unbound.conf for the OpenVPN subnet."
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echo "No changes are made to the current configuration."
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echo ""
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while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
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read -rp "Apply configuration changes to Unbound? [y/n]: " -e CONTINUE
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done
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if [[ $CONTINUE = "n" ]];then
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# Break the loop and cleanup
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unset DNS
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unset CONTINUE
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fi
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fi
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done
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echo ""
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echo "Do you want to customize encryption settings?"
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echo "Unless you know what you're doing, you should stick with the default parameters provided by the script."
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echo "Note that whatever you choose, all the choices presented in the script are safe. (Unlike OpenVPN's defaults)"
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echo "See https://github.com/angristan/openvpn-install#encryption to learn more."
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echo ""
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until [[ $CUSTOMIZE_ENC =~ (y|n) ]]; do
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read -rp "Customize encryption settings? [y/n]: " -e -i n CUSTOMIZE_ENC
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done
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if [[ $CUSTOMIZE_ENC == "n" ]];then
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# Use default, sane and fast paramters
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CIPHER="cipher AES-128-CBC"
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DH_KEY_SIZE="2048"
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RSA_KEY_SIZE="2048"
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else
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echo ""
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echo "Choose which cipher you want to use for the data channel:"
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echo " 1) AES-128-CBC (recommended)"
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echo " 2) AES-192-CBC"
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echo " 3) AES-256-CBC"
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until [[ "$CIPHER_CHOICE" =~ ^[0-9]+$ ]] && [ "$CIPHER_CHOICE" -ge 1 ] && [ "$CIPHER_CHOICE" -le 3 ]; do
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read -rp "Cipher [1-7]: " -e -i 1 CIPHER_CHOICE
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done
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case $CIPHER_CHOICE in
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1)
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CIPHER="cipher AES-128-CBC"
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;;
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2)
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CIPHER="cipher AES-192-CBC"
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;;
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3)
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CIPHER="cipher AES-256-CBC"
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;;
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esac
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echo ""
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echo "Choose what size of Diffie-Hellman key you want to use:"
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echo " 1) 2048 bits (fastest)"
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echo " 2) 3072 bits (recommended, best compromise)"
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echo " 3) 4096 bits (most secure)"
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until [[ "$DH_KEY_SIZE_CHOICE" =~ ^[0-9]+$ ]] && [ "$DH_KEY_SIZE_CHOICE" -ge 1 ] && [ "$DH_KEY_SIZE_CHOICE" -le 3 ]; do
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read -rp "DH key size [1-3]: " -e -i 2 DH_KEY_SIZE_CHOICE
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done
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case $DH_KEY_SIZE_CHOICE in
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1)
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DH_KEY_SIZE="2048"
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;;
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2)
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DH_KEY_SIZE="3072"
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;;
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3)
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DH_KEY_SIZE="4096"
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;;
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esac
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echo ""
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echo "Choose what size of RSA key you want to use for the certificate:"
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echo " 1) 2048 bits (fastest)"
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echo " 2) 3072 bits (recommended, best compromise)"
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echo " 3) 4096 bits (most secure)"
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until [[ "$RSA_KEY_SIZE_CHOICE" =~ ^[0-9]+$ ]] && [ "$RSA_KEY_SIZE_CHOICE" -ge 1 ] && [ "$RSA_KEY_SIZE_CHOICE" -le 3 ]; do
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read -rp "RSA key size [1-3]: " -e -i 2 RSA_KEY_SIZE_CHOICE
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done
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case $RSA_KEY_SIZE_CHOICE in
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1)
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RSA_KEY_SIZE="2048"
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;;
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2)
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RSA_KEY_SIZE="3072"
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;;
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3)
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RSA_KEY_SIZE="4096"
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;;
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esac
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fi
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echo ""
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echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now."
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echo "You will be able to generate a client at the end of the installtion."
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read -n1 -r -p "Press any key to continue..."
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# Get the "public" interface from the default route
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NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | head -1)
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if [[ "$OS" = 'debian' ]]; then
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apt-get update
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apt-get install ca-certificates gnupg -y
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# We add the OpenVPN repo to get the latest version.
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if [[ "$VERSION_ID" = 'VERSION_ID="8"' ]]; then
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echo "deb http://build.openvpn.net/debian/openvpn/stable jessie main" > /etc/apt/sources.list.d/openvpn.list
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wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
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apt-get update
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fi
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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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apt-get install openvpn iptables openssl wget ca-certificates curl -y
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elif [[ "$OS" = 'centos' ]]; then
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yum install epel-release openvpn iptables openssl wget ca-certificates curl -y
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elif [[ "$OS" = 'fedora' ]]; then
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dnf install openvpn iptables openssl wget ca-certificates curl -y
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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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else
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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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if [[ -d /etc/openvpn/easy-rsa/ ]]; then
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rm -rf /etc/openvpn/easy-rsa/
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fi
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# Install the latest version of easy-rsa from source
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local version="3.0.4"
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wget -O ~/EasyRSA-${version}.tgz https://github.com/OpenVPN/easy-rsa/releases/download/v${version}/EasyRSA-${version}.tgz
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tar xzf ~/EasyRSA-${version}.tgz -C ~/
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mv ~/EasyRSA-${version}/ /etc/openvpn/
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mv /etc/openvpn/EasyRSA-${version}/ /etc/openvpn/easy-rsa/
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chown -R root:root /etc/openvpn/easy-rsa/
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rm -f ~/EasyRSA-${version}.tgz
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cd /etc/openvpn/easy-rsa/
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# Generate a random, alphanumeric identifier of 16 characters for CN and one for server name
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SERVER_CN="cn_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
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SERVER_NAME="server_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
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echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
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echo "set_var EASYRSA_REQ_CN $SERVER_CN" >> vars
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# Create the PKI, set up the CA, the DH params and the server certificate
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./easyrsa init-pki
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./easyrsa --batch build-ca nopass
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openssl dhparam -out dh.pem $DH_KEY_SIZE
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./easyrsa build-server-full "$SERVER_NAME" nopass
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EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
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# Generate tls-auth key
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openvpn --genkey --secret /etc/openvpn/tls-auth.key
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# Move all the generated files
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cp pki/ca.crt pki/private/ca.key dh.pem "pki/issued/$SERVER_NAME.crt" "pki/private/$SERVER_NAME.key" /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
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# Make cert revocation list readable for non-root
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chmod 644 /etc/openvpn/crl.pem
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# Generate server.conf
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echo "port $PORT" > /etc/openvpn/server.conf
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if [[ "$IPV6_SUPPORT" = 'n' ]]; then
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echo "proto $PROTOCOL" >> /etc/openvpn/server.conf
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elif [[ "$IPV6_SUPPORT" = 'y' ]]; then
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echo "proto ${PROTOCOL}6" >> /etc/openvpn/server.conf
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fi
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echo "dev tun
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user nobody
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group $NOGROUP
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persist-key
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persist-tun
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keepalive 10 120
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topology subnet
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server 10.8.0.0 255.255.255.0
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ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
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# DNS resolvers
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case $DNS in
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1)
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# Locate the proper resolv.conf
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# Needed for systems running systemd-resolved
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if grep -q "127.0.0.53" "/etc/resolv.conf"; then
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RESOLVCONF='/run/systemd/resolve/resolv.conf'
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else
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RESOLVCONF='/etc/resolv.conf'
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fi
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# Obtain the resolvers from resolv.conf and use them for OpenVPN
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grep -v '#' $RESOLVCONF | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read -r line; do
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echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
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done
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;;
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2)
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echo 'push "dhcp-option DNS 10.8.0.1"' >> /etc/openvpn/server.conf
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;;
|
||
3) # Cloudflare
|
||
echo 'push "dhcp-option DNS 1.0.0.1"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 1.1.1.1"' >> /etc/openvpn/server.conf
|
||
;;
|
||
4) # Quad9
|
||
echo 'push "dhcp-option DNS 9.9.9.9"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 149.112.112.112"' >> /etc/openvpn/server.conf
|
||
;;
|
||
5) # FDN
|
||
echo 'push "dhcp-option DNS 80.67.169.40"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 80.67.169.12"' >> /etc/openvpn/server.conf
|
||
;;
|
||
6) # DNS.WATCH
|
||
echo 'push "dhcp-option DNS 84.200.69.80"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 84.200.70.40"' >> /etc/openvpn/server.conf
|
||
;;
|
||
7) # OpenDNS
|
||
echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
|
||
;;
|
||
8) # Google
|
||
echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
|
||
;;
|
||
9) # Yandex Basic
|
||
echo 'push "dhcp-option DNS 77.88.8.8"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 77.88.8.1"' >> /etc/openvpn/server.conf
|
||
;;
|
||
10) # AdGuard DNS
|
||
echo 'push "dhcp-option DNS 176.103.130.130"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
|
||
;;
|
||
esac
|
||
echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
|
||
|
||
# IPv6 network settings if needed
|
||
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
|
||
echo 'server-ipv6 fd42:42:42:42::/112
|
||
tun-ipv6
|
||
push tun-ipv6
|
||
push "route-ipv6 2000::/3"
|
||
push "redirect-gateway ipv6"' >> /etc/openvpn/server.conf
|
||
fi
|
||
|
||
echo "crl-verify crl.pem
|
||
ca ca.crt
|
||
cert $SERVER_NAME.crt
|
||
key $SERVER_NAME.key
|
||
tls-auth tls-auth.key 0
|
||
dh dh.pem
|
||
auth SHA256
|
||
$CIPHER
|
||
tls-server
|
||
tls-version-min 1.2
|
||
tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
|
||
status /var/log/openvpn/status.log
|
||
verb 3" >> /etc/openvpn/server.conf
|
||
|
||
# Create log dir
|
||
mkdir -p /var/log/openvpn
|
||
|
||
# Enable routing
|
||
echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.d/20-openvpn.conf
|
||
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
|
||
echo 'net.ipv6.conf.all.forwarding=1' >> /etc/sysctl.d/20-openvpn.conf
|
||
fi
|
||
# Avoid an unneeded reboot
|
||
sysctl --system
|
||
|
||
# If SELinux is enabled and a custom port was selected, we need this
|
||
if hash sestatus 2>/dev/null; then
|
||
if sestatus | grep "Current mode" | grep -qs "enforcing"; then
|
||
if [[ "$PORT" != '1194' ]]; then
|
||
semanage port -a -t openvpn_port_t -p "$PROTOCOL" "$PORT"
|
||
fi
|
||
fi
|
||
fi
|
||
|
||
# Finally, restart and enable OpenVPN
|
||
if [[ "$OS" = 'fedora' ]]; then
|
||
# Workaround to fix OpenVPN service on OpenVZ
|
||
sed -i 's|LimitNPROC|#LimitNPROC|' /usr/lib/systemd/system/openvpn-server@.service
|
||
# Another workaround to keep using /etc/openvpn/
|
||
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /usr/lib/systemd/system/openvpn-server@.service
|
||
systemctl daemon-reload
|
||
systemctl restart openvpn-server@server
|
||
systemctl enable openvpn-server@server
|
||
else
|
||
# Workaround to fix OpenVPN service on OpenVZ
|
||
sed -i 's|LimitNPROC|#LimitNPROC|' /lib/systemd/system/openvpn\@.service
|
||
# Another workaround to keep using /etc/openvpn/
|
||
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /lib/systemd/system/openvpn\@.service
|
||
systemctl daemon-reload
|
||
systemctl restart openvpn@server
|
||
systemctl enable openvpn@server
|
||
fi
|
||
|
||
if [[ $DNS == 2 ]];then
|
||
installUnbound
|
||
fi
|
||
|
||
# Add iptables rules in two scripts
|
||
mkdir /etc/iptables
|
||
|
||
# Script to add rules
|
||
echo "#!/bin/sh
|
||
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o $NIC -j MASQUERADE
|
||
iptables -A INPUT -i tun0 -j ACCEPT
|
||
iptables -A FORWARD -i $NIC -o tun0 -j ACCEPT
|
||
iptables -A FORWARD -i tun0 -o $NIC -j ACCEPT
|
||
iptables -A INPUT -i $NIC -p $PROTOCOL --dport $PORT -j ACCEPT" > /etc/iptables/add-openvpn-rules.sh
|
||
|
||
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
|
||
echo "ip6tables -t nat -A POSTROUTING -s fd42:42:42:42::/112 -o $NIC -j MASQUERADE
|
||
ip6tables -A INPUT -i tun0 -j ACCEPT
|
||
ip6tables -A FORWARD -i $NIC -o tun0 -j ACCEPT
|
||
ip6tables -A FORWARD -i tun0 -o $NIC -j ACCEPT" >> /etc/iptables/add-openvpn-rules.sh
|
||
fi
|
||
|
||
# Script to remove rules
|
||
echo "#!/bin/sh
|
||
iptables -t nat -D POSTROUTING -s 10.8.0.0/24 -o $NIC -j MASQUERADE
|
||
iptables -D INPUT -i tun0 -j ACCEPT
|
||
iptables -D FORWARD -i $NIC -o tun0 -j ACCEPT
|
||
iptables -D FORWARD -i tun0 -o $NIC -j ACCEPT
|
||
iptables -D INPUT -i $NIC -p $PROTOCOL --dport $PORT -j ACCEPT" > /etc/iptables/rm-openvpn-rules.sh
|
||
|
||
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
|
||
echo "ip6tables -t nat -D POSTROUTING -s fd42:42:42:42::/112 -o $NIC -j MASQUERADE
|
||
ip6tables -D INPUT -i tun0 -j ACCEPT
|
||
ip6tables -D FORWARD -i $NIC -o tun0 -j ACCEPT
|
||
ip6tables -D FORWARD -i tun0 -o $NIC -j ACCEPT" >> /etc/iptables/rm-openvpn-rules.sh
|
||
fi
|
||
|
||
chmod +x /etc/iptables/add-openvpn-rules.sh
|
||
chmod +x /etc/iptables/rm-openvpn-rules.sh
|
||
|
||
# Handle the rules via a systemd script
|
||
echo "[Unit]
|
||
Description=iptables rules for OpenVPN
|
||
Before=network-pre.target
|
||
Wants=network-pre.target
|
||
|
||
[Service]
|
||
Type=oneshot
|
||
ExecStart=/etc/iptables/add-openvpn-rules.sh
|
||
ExecStop=/etc/iptables/rm-openvpn-rules.sh
|
||
RemainAfterExit=yes
|
||
|
||
[Install]
|
||
WantedBy=multi-user.target" > /etc/systemd/system/iptables-openvpn.service
|
||
|
||
# Enable service and apply rules
|
||
systemctl daemon-reload
|
||
systemctl enable iptables-openvpn
|
||
systemctl start iptables-openvpn
|
||
|
||
# If the server is behind a NAT, use the correct IP address for the clients to connect to
|
||
if [[ "$PUBLICIP" != "" ]]; then
|
||
IP=$PUBLICIP
|
||
fi
|
||
|
||
# client-template.txt is created so we have a template to add further users later
|
||
echo "client" > /etc/openvpn/client-template.txt
|
||
if [[ "$PROTOCOL" = 'udp' ]]; then
|
||
echo "proto udp" >> /etc/openvpn/client-template.txt
|
||
elif [[ "$PROTOCOL" = 'tcp' ]]; then
|
||
echo "proto tcp-client" >> /etc/openvpn/client-template.txt
|
||
fi
|
||
echo "remote $IP $PORT
|
||
dev tun
|
||
resolv-retry infinite
|
||
nobind
|
||
persist-key
|
||
persist-tun
|
||
remote-cert-tls server
|
||
verify-x509-name $SERVER_NAME name
|
||
auth SHA256
|
||
auth-nocache
|
||
$CIPHER
|
||
tls-client
|
||
tls-version-min 1.2
|
||
tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
|
||
setenv opt block-outside-dns # Prevent Windows 10 DNS leak
|
||
verb 3" >> /etc/openvpn/client-template.txt
|
||
|
||
# Generate the custom client.ovpn
|
||
newClient
|
||
echo "If you want to add more clients, you simply need to run this script another time!"
|
||
}
|
||
|
||
function newClient () {
|
||
echo ""
|
||
echo "Tell me a name for the client."
|
||
echo "Use one word only, no special characters."
|
||
|
||
until [[ "$CLIENT" =~ ^[a-zA-Z0-9_]+$ ]]; do
|
||
read -rp "Client name: " -e CLIENT
|
||
done
|
||
|
||
echo ""
|
||
echo "Do you want to protect the configuration file with a password?"
|
||
echo "(e.g. encrypt the private key with a password)"
|
||
echo " 1) Add a passwordless client"
|
||
echo " 2) Use a password for the client"
|
||
|
||
until [[ "$PASS" =~ ^[1-2]$ ]]; do
|
||
read -rp "Select an option [1-2]: " -e -i 1 PASS
|
||
done
|
||
|
||
cd /etc/openvpn/easy-rsa/ || return
|
||
case $PASS in
|
||
1)
|
||
./easyrsa build-client-full "$CLIENT" nopass
|
||
;;
|
||
2)
|
||
echo "⚠️ You will be asked for the client password below ⚠️"
|
||
./easyrsa build-client-full "$CLIENT"
|
||
;;
|
||
esac
|
||
|
||
# Home directory of the user, where the client configuration (.ovpn) will be written
|
||
if [ -e "/home/$CLIENT" ]; then # if $1 is a user name
|
||
homeDir="/home/$CLIENT"
|
||
elif [ "${SUDO_USER}" ]; then # if not, use SUDO_USER
|
||
homeDir="/home/${SUDO_USER}"
|
||
else # if not SUDO_USER, use /root
|
||
homeDir="/root"
|
||
fi
|
||
|
||
# Generates the custom client.ovpn
|
||
cp /etc/openvpn/client-template.txt "$homeDir/$CLIENT.ovpn"
|
||
{
|
||
echo "<ca>"
|
||
cat "/etc/openvpn/easy-rsa/pki/ca.crt"
|
||
echo "</ca>"
|
||
|
||
echo "<cert>"
|
||
cat "/etc/openvpn/easy-rsa/pki/issued/$CLIENT.crt"
|
||
echo "</cert>"
|
||
|
||
echo "<key>"
|
||
cat "/etc/openvpn/easy-rsa/pki/private/$CLIENT.key"
|
||
echo "</key>"
|
||
echo "key-direction 1"
|
||
|
||
echo "<tls-auth>"
|
||
cat "/etc/openvpn/tls-auth.key"
|
||
echo "</tls-auth>"
|
||
} >> "$homeDir/$CLIENT.ovpn"
|
||
|
||
echo ""
|
||
echo "Client $CLIENT added, the configuration file is available at $homeDir/$CLIENT.ovpn."
|
||
echo "Download the .ovpn file and import it in your OpenVPN client."
|
||
}
|
||
|
||
function revokeClient () {
|
||
NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
|
||
if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
|
||
echo ""
|
||
echo "You have no existing clients!"
|
||
exit 1
|
||
fi
|
||
|
||
echo ""
|
||
echo "Select the existing client certificate you want to revoke"
|
||
tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
|
||
if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
|
||
read -rp "Select one client [1]: " CLIENTNUMBER
|
||
else
|
||
read -rp "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
|
||
fi
|
||
|
||
CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
|
||
cd /etc/openvpn/easy-rsa/
|
||
./easyrsa --batch revoke "$CLIENT"
|
||
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
|
||
# Cleanup
|
||
rm -f "pki/reqs/$CLIENT.req"
|
||
rm -f "pki/private/$CLIENT.key"
|
||
rm -f "pki/issued/$CLIENT.crt"
|
||
rm -f /etc/openvpn/crl.pem
|
||
cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
|
||
chmod 644 /etc/openvpn/crl.pem
|
||
find /home/ -maxdepth 2 -name "$CLIENT.ovpn" -delete
|
||
rm -f "/root/$CLIENT.ovpn"
|
||
|
||
echo ""
|
||
echo "Certificate for client $CLIENT revoked."
|
||
}
|
||
|
||
function removeUnbound () {
|
||
# Remove OpenVPN-related config
|
||
sed -i 's|include: \/etc\/unbound\/openvpn.conf||' /etc/unbound/unbound.conf
|
||
rm /etc/unbound/openvpn.conf
|
||
systemctl restart unbound
|
||
|
||
until [[ $REMOVE_UNBOUND == "y" || $REMOVE_UNBOUND == "n" ]]; do
|
||
echo ""
|
||
echo "If you were already using Unbound before installing OpenVPN, I removed the configuration related to OpenVPN."
|
||
read -rp "Do you want to completely remove Unbound? [y/n]: " -e REMOVE_UNBOUND
|
||
done
|
||
|
||
if [[ "$REMOVE_UNBOUND" = 'y' ]]; then
|
||
# Stop Unbound
|
||
systemctl stop unbound
|
||
|
||
if [[ "$OS" = 'debian' ]]; then
|
||
apt-get autoremove --purge -y unbound
|
||
elif [[ "$OS" = 'centos' ]]; then
|
||
yum remove unbound -y
|
||
elif [[ "$OS" = 'fedora' ]]; then
|
||
dnf remove unbound -y
|
||
fi
|
||
|
||
rm -rf /etc/unbound/
|
||
|
||
echo ""
|
||
echo "Unbound removed!"
|
||
else
|
||
echo ""
|
||
echo "Unbound wasn't removed."
|
||
fi
|
||
}
|
||
|
||
function removeOpenVPN () {
|
||
echo ""
|
||
read -rp "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
|
||
if [[ "$REMOVE" = 'y' ]]; then
|
||
# Get OpenVPN port from the configuration
|
||
PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
|
||
|
||
# Stop OpenVPN
|
||
if [[ "$OS" = 'fedora' ]]; then
|
||
systemctl stop openvpn-server@server
|
||
else
|
||
systemctl stop openvpn@server
|
||
fi
|
||
|
||
# Remove the iptables rules related to the script
|
||
systemctl stop iptables-openvpn
|
||
# Cleanup
|
||
systemctl disable iptables-openvpn
|
||
rm /etc/systemd/system/iptables-openvpn.service
|
||
systemctl daemon-reload
|
||
rm /etc/iptables/add-openvpn-rules.sh
|
||
rm /etc/iptables/rm-openvpn-rules.sh
|
||
|
||
# SELinux
|
||
if hash sestatus 2>/dev/null; then
|
||
if sestatus | grep "Current mode" | grep -qs "enforcing"; then
|
||
if [[ "$PORT" != '1194' ]]; then
|
||
semanage port -d -t openvpn_port_t -p udp "$PORT"
|
||
fi
|
||
fi
|
||
fi
|
||
|
||
if [[ "$OS" = 'debian' ]]; then
|
||
apt-get autoremove --purge -y openvpn
|
||
elif [[ "$OS" = 'centos' ]]; then
|
||
yum remove openvpn -y
|
||
elif [[ "$OS" = 'fedora' ]]; then
|
||
dnf remove openvpn -y
|
||
fi
|
||
|
||
# Cleanup
|
||
find /home/ -maxdepth 2 -name "*.ovpn" -delete
|
||
find /root/ -maxdepth 1 -name "*.ovpn" -delete
|
||
rm -rf /etc/openvpn
|
||
rm -rf /usr/share/doc/openvpn*
|
||
rm -f /etc/sysctl.d/20-openvpn.conf
|
||
|
||
# Unbound
|
||
if [[ -e /etc/unbound/openvpn.conf ]]; then
|
||
removeUnbound
|
||
fi
|
||
echo ""
|
||
echo "OpenVPN removed!"
|
||
else
|
||
echo ""
|
||
echo "Removal aborted!"
|
||
fi
|
||
}
|
||
|
||
function manageMenu () {
|
||
clear
|
||
echo "Welcome to OpenVPN-install!"
|
||
echo "The git repository is available at: https://github.com/angristan/openvpn-install"
|
||
echo ""
|
||
echo "It looks like OpenVPN is already installed."
|
||
echo ""
|
||
echo "What do you want to do?"
|
||
echo " 1) Add a new user"
|
||
echo " 2) Revoke existing user"
|
||
echo " 3) Remove OpenVPN"
|
||
echo " 4) Exit"
|
||
until [[ "$MENU_OPTION" =~ ^[1-4]$ ]]; do
|
||
read -rp "Select an option [1-4]: " MENU_OPTION
|
||
done
|
||
|
||
case $MENU_OPTION in
|
||
1)
|
||
newClient
|
||
;;
|
||
2)
|
||
revokeClient
|
||
;;
|
||
3)
|
||
removeOpenVPN
|
||
;;
|
||
4)
|
||
exit 0
|
||
;;
|
||
esac
|
||
}
|
||
|
||
# Check for root, TUN, OS...
|
||
initialCheck
|
||
|
||
# Check if OpenVPN is already installed
|
||
if [[ -e /etc/openvpn/server.conf ]]; then
|
||
manageMenu
|
||
else
|
||
installOpenVPN
|
||
fi
|