mirror of
https://github.com/namibia/openvpn-install.git
synced 2024-11-18 02:05:12 +00:00
922 lines
30 KiB
Bash
922 lines
30 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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# Verify root
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if [[ "$EUID" -ne 0 ]]; then
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echo "Sorry, you need to run this as root"
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exit 1
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fi
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# Verify tun
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if [[ ! -e /dev/net/tun ]]; then
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echo "TUN is not available"
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exit 2
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fi
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if [[ -e /etc/debian_version ]]; then
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OS="debian"
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# Getting the version number, to verify that a recent version of OpenVPN is available
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VERSION_ID=$(grep "VERSION_ID" /etc/os-release)
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IPTABLES='/etc/iptables/iptables.rules'
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if [[ "$VERSION_ID" != 'VERSION_ID="8"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="9"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="14.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.10"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="18.04"' ]]; then
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echo "Your version of Debian/Ubuntu is not supported."
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echo "I can't install a recent version of OpenVPN on your system."
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echo ""
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echo "However, if you're using Debian unstable/testing, or Ubuntu beta,"
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echo "then you can continue, a recent version of OpenVPN is available on these."
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echo "Keep in mind they are not supported, though."
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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 4
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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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IPTABLES='/etc/iptables/iptables.rules'
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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 5
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fi
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fi
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OS=centos
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IPTABLES='/etc/iptables/iptables.rules'
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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 4
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fi
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newclient () {
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# Where to write the custom client.ovpn?
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if [ -e "/home/$1" ]; then # if $1 is a user name
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homeDir="/home/$1"
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elif [ "${SUDO_USER}" ]; then # if not, use SUDO_USER
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homeDir="/home/${SUDO_USER}"
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else # if not SUDO_USER, use /root
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homeDir="/root"
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fi
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# Generates the custom client.ovpn
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cp /etc/openvpn/client-template.txt "$homeDir/$1.ovpn"
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{
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echo "<ca>"
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cat "/etc/openvpn/easy-rsa/pki/ca.crt"
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echo "</ca>"
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echo "<cert>"
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cat "/etc/openvpn/easy-rsa/pki/issued/$1.crt"
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echo "</cert>"
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echo "<key>"
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cat "/etc/openvpn/easy-rsa/pki/private/$1.key"
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echo "</key>"
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echo "key-direction 1"
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echo "<tls-auth>"
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cat "/etc/openvpn/tls-auth.key"
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echo "</tls-auth>"
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} >> "$homeDir/$1.ovpn"
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}
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function installLocalDNS () {
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if [[ ! -e /etc/unbound/unbound.conf ]]; then
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if [[ "$OS" = "debian" ]]; then
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apt-get install -y unbound
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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
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# Unbound is already installed
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echo 'include: /etc/unbound/openvpn.conf' >> /etc/unbound/unbound.conf
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# Add OpenVPN integration
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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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if pgrep systemd-journal; then
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systemctl enable unbound
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systemctl start unbound
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else
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service unbound restart
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fi
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}
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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+)' | head -1)
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if [[ -e /etc/openvpn/server.conf ]]; then
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while :
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do
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clear
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echo "OpenVPN-install (github.com/Angristan/OpenVPN-install)"
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echo ""
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echo "Looks like OpenVPN is already installed"
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echo ""
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echo "What do you want to do?"
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echo " 1) Add a cert for a new user"
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echo " 2) Revoke existing user cert"
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echo " 3) Remove OpenVPN"
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echo " 4) Exit"
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read -rp "Select an option [1-4]: " option
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case $option in
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1)
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echo ""
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echo "Do you want to protect the configuration file with a password?"
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echo "(e.g. encrypt the private key with a password)"
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echo " 1) Add a passwordless client"
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echo " 2) Use a password for the client"
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until [[ "$pass" =~ ^[1-2]$ ]]; do
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read -rp "Select an option [1-2]: " -e -i 1 pass
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done
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echo ""
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echo "Tell me a name for the client cert"
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echo "Use one word only, no special characters"
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until [[ "$CLIENT" =~ ^[a-zA-Z0-9_]+$ ]]; do
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read -rp "Client name: " -e CLIENT
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done
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cd /etc/openvpn/easy-rsa/
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case $pass in
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1)
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./easyrsa build-client-full $CLIENT nopass
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;;
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2)
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echo "⚠️ You will be asked for the client password below ⚠️"
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./easyrsa build-client-full $CLIENT
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;;
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esac
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# Generates the custom client.ovpn
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newclient "$CLIENT"
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echo ""
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echo "Client $CLIENT added, certs available at $homeDir/$CLIENT.ovpn"
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exit
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;;
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2)
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NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
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if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
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echo ""
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echo "You have no existing clients!"
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exit 5
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fi
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echo ""
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echo "Select the existing client certificate you want to revoke"
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tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
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if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
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read -rp "Select one client [1]: " CLIENTNUMBER
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else
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read -rp "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
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fi
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CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
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cd /etc/openvpn/easy-rsa/
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./easyrsa --batch revoke $CLIENT
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EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
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rm -f pki/reqs/$CLIENT.req
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rm -f pki/private/$CLIENT.key
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rm -f pki/issued/$CLIENT.crt
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rm -f /etc/openvpn/crl.pem
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cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
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chmod 644 /etc/openvpn/crl.pem
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rm -f $(find /home -maxdepth 2 | grep $CLIENT.ovpn) 2>/dev/null
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rm -f /root/$CLIENT.ovpn 2>/dev/null
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echo ""
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echo "Certificate for client $CLIENT revoked"
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echo "Exiting..."
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exit
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;;
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3)
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echo ""
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read -rp "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
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if [[ "$REMOVE" = 'y' ]]; then
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PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
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if pgrep firewalld; then
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# Using both permanent and not permanent rules to avoid a firewalld reload.
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firewall-cmd --zone=public --remove-port=$PORT/udp
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firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
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firewall-cmd --permanent --zone=public --remove-port=$PORT/udp
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firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
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fi
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if iptables -L -n | grep -qE 'REJECT|DROP'; then
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if [[ "$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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iptables -t nat -D POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
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if [[ "$IPV6" = 'y' ]]; then
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ip6tables -t nat -D POSTROUTING -o $NIC -s fd42:42:42:42::/112 -j MASQUERADE
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fi
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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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semanage port -d -t openvpn_port_t -p udp $PORT
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fi
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fi
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fi
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if [[ "$OS" = 'debian' ]]; then
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apt-get autoremove --purge -y openvpn
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else
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yum remove openvpn -y
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fi
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OVPNS=$(ls /etc/openvpn/easy-rsa/pki/issued | awk -F "." {'print $1'})
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for i in $OVPNS;do
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rm $(find /home -maxdepth 2 | grep $i.ovpn) 2>/dev/null
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rm /root/$i.ovpn 2>/dev/null
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done
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rm -rf /etc/openvpn
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rm -rf /usr/share/doc/openvpn*
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rm -f /etc/sysctl.d/20-openvpn.conf
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if [[ -e /etc/unbound/openvpn.conf ]]; then
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# Remove OpenVPN-related config
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sed -i 's|include: \/etc\/unbound\/openvpn.conf||' /etc/unbound/unbound.conf
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rm /etc/unbound/openvpn.conf
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service unbound restart
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until [[ $REMOVE_UNBOUND == "y" || $REMOVE_UNBOUND == "n" ]]; do
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echo ""
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echo "If you were already using Unbound before installing OpenVPN, I removed the configuration related to OpenVPN."
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echo "You can keep using Unbound as before."
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read -rp "Do you want to completely remove Unbound? [y/n]: " -e REMOVE_UNBOUND
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done
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if [[ "$REMOVE_UNBOUND" = 'y' ]]; then
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if [[ "$OS" = 'debian' ]]; then
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apt-get autoremove --purge -y unbound
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else
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yum remove unbound -y
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fi
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echo ""
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echo "Unbound removed!"
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else
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echo ""
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echo "Unbound not removed!"
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fi
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fi
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echo ""
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echo "OpenVPN removed!"
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else
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echo ""
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echo "Removal aborted!"
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fi
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exit
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;;
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4) exit;;
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esac
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done
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else
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clear
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echo "Welcome to the secure OpenVPN installer (github.com/Angristan/OpenVPN-install)"
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echo ""
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# OpenVPN setup and first user creation
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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 "If your server is running behind a NAT, (e.g. LowEndSpirit, Scaleway) leave the IP address as it is. (local/private IP)"
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echo "Otherwise, it should be your public IPv4 address."
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# Autodetect IP 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 "This server is behind NAT. What is the public IPv4 address or hostname?"
|
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read -rp "Public IP address / hostname: " -e PUBLICIP
|
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fi
|
||
echo ""
|
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echo "Checking for IPv6 connectivity..."
|
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ping6 -c4 ipv6.google.com > /dev/null 2>&1;
|
||
echo ""
|
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if [[ $? == 0 ]]; then
|
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echo "Your host appears to have IPv6 connectivity."
|
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else
|
||
echo "Your host does not appear to have IPv6 connectivity."
|
||
fi
|
||
echo ""
|
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while [[ $IPV6 != "y" && $IPV6 != "n" ]]; do
|
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read -rp "Do you want to enable IPv6 support? [y/n]: " -e IPV6
|
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done
|
||
echo ""
|
||
echo "What port do you want for OpenVPN?"
|
||
echo " 1) Default: 1194"
|
||
echo " 2) Custom"
|
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echo " 3) Random [49152-65535]"
|
||
until [[ "$PORT_CHOICE" =~ ^[1-3]$ ]]; do
|
||
read -p "Port choice [1-3]: " -e -i 1 PORT_CHOICE
|
||
done
|
||
case $PORT_CHOICE in
|
||
1)
|
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PORT="1194"
|
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;;
|
||
2)
|
||
until [[ "$PORT" =~ ^[0-9]+$ ]] && [ "$PORT" -ge 1 -a "$PORT" -le 65535 ]; do
|
||
read -p "Custom port [1-65535]: " -e -i 1194 PORT
|
||
done
|
||
;;
|
||
3)
|
||
# Generate random number within private ports range
|
||
PORT=$(shuf -i49152-65535 -n1)
|
||
echo "Random Port: $PORT"
|
||
;;
|
||
esac
|
||
echo ""
|
||
echo "What protocol do you want for OpenVPN?"
|
||
echo "Unless UDP is blocked, you should not use TCP (unnecessarily slower)"
|
||
until [[ "$PROTOCOL" == "UDP" || "$PROTOCOL" == "TCP" ]]; do
|
||
read -rp "Protocol [UDP/TCP]: " -e -i UDP PROTOCOL
|
||
done
|
||
echo ""
|
||
echo "What DNS do you want to use with the VPN?"
|
||
echo " 1) Current system resolvers (from /etc/resolv.conf)"
|
||
echo " 2) Self-hosted DNS Resolver (Unbound)"
|
||
echo " 3) Cloudflare (Anycast: worldwide)"
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||
echo " 4) Quad9 (Anycast: worldwide)"
|
||
echo " 5) FDN (France)"
|
||
echo " 6) DNS.WATCH (Germany)"
|
||
echo " 7) OpenDNS (Anycast: worldwide)"
|
||
echo " 8) Google (Anycast: worldwide)"
|
||
echo " 9) Yandex Basic (Russia)"
|
||
echo " 10) AdGuard DNS (Russia)"
|
||
until [[ "$DNS" =~ ^[0-9]+$ ]] && [ "$DNS" -ge 1 -a "$DNS" -le 10 ]; do
|
||
read -rp "DNS [1-10]: " -e -i 1 DNS
|
||
if [[ $DNS == 2 ]] && [[ -e /etc/unbound/unbound.conf ]]; then
|
||
echo ""
|
||
echo "Unbound is already installed."
|
||
echo "You can allow the script to configure it in order to use it from your OpenVPN clients"
|
||
echo "We will simply add a second server to /etc/unbound/unbound.conf for the OpenVPN subnet."
|
||
echo "No changes are made to the current configuration."
|
||
echo ""
|
||
|
||
while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
|
||
read -rp "Apply configuration changes to Unbound? [y/n]: " -e CONTINUE
|
||
done
|
||
if [[ $CONTINUE = "n" ]];then
|
||
unset DNS
|
||
unset CONTINUE
|
||
fi
|
||
fi
|
||
done
|
||
echo ""
|
||
echo "See https://github.com/Angristan/OpenVPN-install#encryption to learn more about "
|
||
echo "the encryption in OpenVPN and the choices I made in this script."
|
||
echo "Please note that all the choices proposed are secure (to a different degree)"
|
||
echo "and are still viable to date, unlike some default OpenVPN options"
|
||
echo ''
|
||
echo "Choose which cipher you want to use for the data channel:"
|
||
echo " 1) AES-128-CBC (fastest and sufficiently secure for everyone, recommended)"
|
||
echo " 2) AES-192-CBC"
|
||
echo " 3) AES-256-CBC"
|
||
echo "Alternatives to AES, use them only if you know what you're doing."
|
||
echo "They are relatively slower but as secure as AES."
|
||
echo " 4) CAMELLIA-128-CBC"
|
||
echo " 5) CAMELLIA-192-CBC"
|
||
echo " 6) CAMELLIA-256-CBC"
|
||
echo " 7) SEED-CBC"
|
||
until [[ "$CIPHER" =~ ^[0-9]+$ ]] && [ "$CIPHER" -ge 1 -a "$CIPHER" -le 7 ]; do
|
||
read -rp "Cipher [1-7]: " -e -i 1 CIPHER
|
||
done
|
||
case $CIPHER in
|
||
1)
|
||
CIPHER="cipher AES-128-CBC"
|
||
;;
|
||
2)
|
||
CIPHER="cipher AES-192-CBC"
|
||
;;
|
||
3)
|
||
CIPHER="cipher AES-256-CBC"
|
||
;;
|
||
4)
|
||
CIPHER="cipher CAMELLIA-128-CBC"
|
||
;;
|
||
5)
|
||
CIPHER="cipher CAMELLIA-192-CBC"
|
||
;;
|
||
6)
|
||
CIPHER="cipher CAMELLIA-256-CBC"
|
||
;;
|
||
7)
|
||
CIPHER="cipher SEED-CBC"
|
||
;;
|
||
esac
|
||
echo ""
|
||
echo "Choose what size of Diffie-Hellman key you want to use:"
|
||
echo " 1) 2048 bits (fastest)"
|
||
echo " 2) 3072 bits (recommended, best compromise)"
|
||
echo " 3) 4096 bits (most secure)"
|
||
until [[ "$DH_KEY_SIZE" =~ ^[0-9]+$ ]] && [ "$DH_KEY_SIZE" -ge 1 -a "$DH_KEY_SIZE" -le 3 ]; do
|
||
read -rp "DH key size [1-3]: " -e -i 2 DH_KEY_SIZE
|
||
done
|
||
case $DH_KEY_SIZE in
|
||
1)
|
||
DH_KEY_SIZE="2048"
|
||
;;
|
||
2)
|
||
DH_KEY_SIZE="3072"
|
||
;;
|
||
3)
|
||
DH_KEY_SIZE="4096"
|
||
;;
|
||
esac
|
||
echo ""
|
||
echo "Choose what size of RSA key you want to use:"
|
||
echo " 1) 2048 bits (fastest)"
|
||
echo " 2) 3072 bits (recommended, best compromise)"
|
||
echo " 3) 4096 bits (most secure)"
|
||
until [[ "$RSA_KEY_SIZE" =~ ^[0-9]+$ ]] && [ "$RSA_KEY_SIZE" -ge 1 -a "$RSA_KEY_SIZE" -le 3 ]; do
|
||
read -rp "RSA key size [1-3]: " -e -i 2 RSA_KEY_SIZE
|
||
done
|
||
case $RSA_KEY_SIZE in
|
||
1)
|
||
RSA_KEY_SIZE="2048"
|
||
;;
|
||
2)
|
||
RSA_KEY_SIZE="3072"
|
||
;;
|
||
3)
|
||
RSA_KEY_SIZE="4096"
|
||
;;
|
||
esac
|
||
echo ""
|
||
echo "Do you want to protect the configuration file with a password?"
|
||
echo "(e.g. encrypt the private key with a password)"
|
||
echo " 1) Add a passwordless client"
|
||
echo " 2) Use a password for the client"
|
||
until [[ "$pass" =~ ^[1-2]$ ]]; do
|
||
read -rp "Select an option [1-2]: " -e -i 1 pass
|
||
done
|
||
echo ""
|
||
echo "Finally, tell me a name for the client certificate and configuration"
|
||
echo "Use one word only, no special characters"
|
||
until [[ "$CLIENT" =~ ^[a-zA-Z0-9_]+$ ]]; do
|
||
read -rp "Client name: " -e -i client CLIENT
|
||
done
|
||
echo ""
|
||
echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
|
||
read -n1 -r -p "Press any key to continue..."
|
||
|
||
if [[ "$OS" = 'debian' ]]; then
|
||
apt-get update
|
||
apt-get install ca-certificates gnupg -y
|
||
# We add the OpenVPN repo to get the latest version.
|
||
# Debian 8
|
||
if [[ "$VERSION_ID" = 'VERSION_ID="8"' ]]; then
|
||
echo "deb http://build.openvpn.net/debian/openvpn/stable jessie main" > /etc/apt/sources.list.d/openvpn.list
|
||
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
|
||
apt-get update
|
||
fi
|
||
# Ubuntu 14.04
|
||
if [[ "$VERSION_ID" = 'VERSION_ID="14.04"' ]]; then
|
||
echo "deb http://build.openvpn.net/debian/openvpn/stable trusty main" > /etc/apt/sources.list.d/openvpn.list
|
||
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
|
||
apt-get update
|
||
fi
|
||
# Ubuntu >= 16.04 and Debian > 8 have OpenVPN > 2.3.3 without the need of a third party repository.
|
||
# The we install OpenVPN
|
||
apt-get install openvpn iptables openssl wget ca-certificates curl -y
|
||
# Install iptables service
|
||
if [[ ! -e /etc/systemd/system/iptables.service ]]; then
|
||
mkdir /etc/iptables
|
||
iptables-save > /etc/iptables/iptables.rules
|
||
echo "#!/bin/sh
|
||
iptables -F
|
||
iptables -X
|
||
iptables -t nat -F
|
||
iptables -t nat -X
|
||
iptables -t mangle -F
|
||
iptables -t mangle -X
|
||
iptables -P INPUT ACCEPT
|
||
iptables -P FORWARD ACCEPT
|
||
iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
|
||
chmod +x /etc/iptables/flush-iptables.sh
|
||
echo "[Unit]
|
||
Description=Packet Filtering Framework
|
||
DefaultDependencies=no
|
||
Before=network-pre.target
|
||
Wants=network-pre.target
|
||
[Service]
|
||
Type=oneshot
|
||
ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
|
||
ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
|
||
ExecStop=/etc/iptables/flush-iptables.sh
|
||
RemainAfterExit=yes
|
||
[Install]
|
||
WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
|
||
systemctl daemon-reload
|
||
systemctl enable iptables.service
|
||
fi
|
||
elif [[ "$OS" = 'centos' || "$OS" = 'fedora' ]]; then
|
||
if [[ "$OS" = 'centos' ]]; then
|
||
yum install epel-release -y
|
||
fi
|
||
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
|
||
systemctl mask firewalld
|
||
fi
|
||
fi
|
||
# Find out if the machine uses nogroup or nobody for the permissionless group
|
||
if grep -qs "^nogroup:" /etc/group; then
|
||
NOGROUP=nogroup
|
||
else
|
||
NOGROUP=nobody
|
||
fi
|
||
|
||
# An old version of easy-rsa was available by default in some openvpn packages
|
||
if [[ -d /etc/openvpn/easy-rsa/ ]]; then
|
||
rm -rf /etc/openvpn/easy-rsa/
|
||
fi
|
||
# Get easy-rsa
|
||
wget -O ~/EasyRSA-3.0.4.tgz https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.4/EasyRSA-3.0.4.tgz
|
||
tar xzf ~/EasyRSA-3.0.4.tgz -C ~/
|
||
mv ~/EasyRSA-3.0.4/ /etc/openvpn/easy-rsa/
|
||
chown -R root:root /etc/openvpn/easy-rsa/
|
||
rm -f ~/EasyRSA-3.0.4.tgz
|
||
cd /etc/openvpn/easy-rsa/
|
||
# Generate a random, alphanumeric identifier of 16 characters for CN and one for server name
|
||
SERVER_CN="cn_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
|
||
SERVER_NAME="server_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
|
||
echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
|
||
echo "set_var EASYRSA_REQ_CN $SERVER_CN" >> vars
|
||
# Create the PKI, set up the CA, the DH params and the server + client certificates
|
||
./easyrsa init-pki
|
||
./easyrsa --batch build-ca nopass
|
||
openssl dhparam -out dh.pem $DH_KEY_SIZE
|
||
./easyrsa build-server-full $SERVER_NAME nopass
|
||
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 $CLIENT
|
||
;;
|
||
esac
|
||
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
|
||
# generate tls-auth key
|
||
openvpn --genkey --secret /etc/openvpn/tls-auth.key
|
||
# Move all the generated files
|
||
cp pki/ca.crt pki/private/ca.key dh.pem pki/issued/$SERVER_NAME.crt pki/private/$SERVER_NAME.key /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
|
||
# Make cert revocation list readable for non-root
|
||
chmod 644 /etc/openvpn/crl.pem
|
||
|
||
# Generate server.conf
|
||
echo "port $PORT" > /etc/openvpn/server.conf
|
||
if [[ "$IPV6" = 'n' ]]; then
|
||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||
echo "proto udp" >> /etc/openvpn/server.conf
|
||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||
echo "proto tcp" >> /etc/openvpn/server.conf
|
||
fi
|
||
elif [[ "$IPV6" = 'y' ]]; then
|
||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||
echo "proto udp6" >> /etc/openvpn/server.conf
|
||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||
echo "proto tcp6" >> /etc/openvpn/server.conf
|
||
fi
|
||
fi
|
||
echo "dev tun
|
||
user nobody
|
||
group $NOGROUP
|
||
persist-key
|
||
persist-tun
|
||
keepalive 10 120
|
||
topology subnet
|
||
server 10.8.0.0 255.255.255.0
|
||
ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
|
||
# DNS resolvers
|
||
case $DNS in
|
||
1)
|
||
# Locate the proper resolv.conf
|
||
# Needed for systems running systemd-resolved
|
||
if grep -q "127.0.0.53" "/etc/resolv.conf"; then
|
||
RESOLVCONF='/run/systemd/resolve/resolv.conf'
|
||
else
|
||
RESOLVCONF='/etc/resolv.conf'
|
||
fi
|
||
# Obtain the resolvers from resolv.conf and use them for OpenVPN
|
||
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
|
||
echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
|
||
done
|
||
;;
|
||
2)
|
||
# Install Unbound
|
||
installLocalDNS
|
||
echo 'push "dhcp-option DNS 10.8.0.1"' >> /etc/openvpn/server.conf
|
||
;;
|
||
3) # Cloudflare
|
||
echo 'push "dhcp-option DNS 1.0.0.1"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 1.1.1.1"' >> /etc/openvpn/server.conf
|
||
;;
|
||
4) # Quad9
|
||
echo 'push "dhcp-option DNS 9.9.9.9"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 149.112.112.112"' >> /etc/openvpn/server.conf
|
||
;;
|
||
5) # FDN
|
||
echo 'push "dhcp-option DNS 80.67.169.40"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 80.67.169.12"' >> /etc/openvpn/server.conf
|
||
;;
|
||
6) # DNS.WATCH
|
||
echo 'push "dhcp-option DNS 84.200.69.80"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 84.200.70.40"' >> /etc/openvpn/server.conf
|
||
;;
|
||
7) # OpenDNS
|
||
echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
|
||
;;
|
||
8) # Google
|
||
echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
|
||
;;
|
||
9) # Yandex Basic
|
||
echo 'push "dhcp-option DNS 77.88.8.8"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 77.88.8.1"' >> /etc/openvpn/server.conf
|
||
;;
|
||
10) # AdGuard DNS
|
||
echo 'push "dhcp-option DNS 176.103.130.130"' >> /etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
|
||
;;
|
||
esac
|
||
echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
|
||
|
||
if [[ "$IPV6" = '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" = 'y' ]]; then
|
||
echo 'net.ipv6.conf.all.forwarding=1' >> /etc/sysctl.d/20-openvpn.conf
|
||
fi
|
||
|
||
# Avoid an unneeded reboot
|
||
sysctl --system
|
||
# Set NAT for the VPN subnet
|
||
iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
|
||
if [[ "$IPV6" = 'y' ]]; then
|
||
ip6tables -t nat -A POSTROUTING -o $NIC -s fd42:42:42:42::/112 -j MASQUERADE
|
||
fi
|
||
# Save persitent iptables rules
|
||
iptables-save > $IPTABLES
|
||
|
||
if pgrep firewalld; then
|
||
# We don't use --add-service=openvpn because that would only work with
|
||
# the default port. Using both permanent and not permanent rules to
|
||
# avoid a firewalld reload.
|
||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||
firewall-cmd --zone=public --add-port=$PORT/udp
|
||
firewall-cmd --permanent --zone=public --add-port=$PORT/udp
|
||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||
firewall-cmd --zone=public --add-port=$PORT/tcp
|
||
firewall-cmd --permanent --zone=public --add-port=$PORT/tcp
|
||
fi
|
||
firewall-cmd --zone=trusted --add-source=10.8.0.0/24
|
||
firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
|
||
fi
|
||
|
||
if iptables -L -n | grep -qE 'REJECT|DROP'; then
|
||
# If iptables has at least one REJECT rule, we asume this is needed.
|
||
# Not the best approach but I can't think of other and this shouldn't
|
||
# cause problems.
|
||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||
iptables -I INPUT -p udp --dport $PORT -j ACCEPT
|
||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||
iptables -I INPUT -p tcp --dport $PORT -j ACCEPT
|
||
fi
|
||
iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
|
||
iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
|
||
# Save persitent OpenVPN rules
|
||
iptables-save > $IPTABLES
|
||
fi
|
||
if [[ "$IPV6" = 'y' ]]; then
|
||
if ip6tables -L -n | grep -qE 'REJECT|DROP'; then
|
||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||
ip6tables -I INPUT -p udp --dport $PORT -j ACCEPT
|
||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||
ip6tables -I INPUT -p tcp --dport $PORT -j ACCEPT
|
||
fi
|
||
ip6tables -I FORWARD -s fd42:42:42:42::/112 -j ACCEPT
|
||
ip6tables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
|
||
# Save persitent OpenVPN rules
|
||
iptables-save > $IPTABLES
|
||
fi
|
||
fi
|
||
# If SELinux is enabled and a custom port was selected, we need this
|
||
if hash sestatus 2>/dev/null; then
|
||
if sestatus | grep "Current mode" | grep -qs "enforcing"; then
|
||
if [[ "$PORT" != '1194' ]]; then
|
||
# semanage isn't available in CentOS 6 by default
|
||
if ! hash semanage 2>/dev/null; then
|
||
yum install policycoreutils-python -y
|
||
fi
|
||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||
semanage port -a -t openvpn_port_t -p udp $PORT
|
||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||
semanage port -a -t openvpn_port_t -p tcp $PORT
|
||
fi
|
||
fi
|
||
fi
|
||
fi
|
||
|
||
# And finally, restart OpenVPN
|
||
if [[ "$OS" = 'debian' ]]; then
|
||
# Little hack to check for systemd
|
||
if pgrep systemd-journal; then
|
||
#Workaround to fix OpenVPN service on OpenVZ
|
||
sed -i 's|LimitNPROC|#LimitNPROC|' /lib/systemd/system/openvpn\@.service
|
||
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /lib/systemd/system/openvpn\@.service
|
||
sed -i 's|%i.conf|server.conf|' /lib/systemd/system/openvpn\@.service
|
||
systemctl daemon-reload
|
||
systemctl restart openvpn
|
||
systemctl enable openvpn
|
||
else
|
||
/etc/init.d/openvpn restart
|
||
fi
|
||
else
|
||
if pgrep systemd-journal; then
|
||
if [[ "$OS" = 'fedora' ]]; then
|
||
# Workaround to avoid rewriting the entire script for Fedora
|
||
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /usr/lib/systemd/system/openvpn-server@.service
|
||
sed -i 's|%i.conf|server.conf|' /usr/lib/systemd/system/openvpn-server@.service
|
||
systemctl daemon-reload
|
||
systemctl restart openvpn-server@openvpn.service
|
||
systemctl enable openvpn-server@openvpn.service
|
||
else
|
||
systemctl restart openvpn@server.service
|
||
systemctl enable openvpn@server.service
|
||
fi
|
||
else
|
||
service openvpn restart
|
||
chkconfig openvpn on
|
||
fi
|
||
fi
|
||
|
||
# If the server is behind a NAT, use the correct IP address
|
||
if [[ "$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
|
||
$CIPHER
|
||
tls-client
|
||
tls-version-min 1.2
|
||
tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
|
||
setenv opt block-outside-dns
|
||
verb 3" >> /etc/openvpn/client-template.txt
|
||
|
||
# Generate the custom client.ovpn
|
||
newclient "$CLIENT"
|
||
echo ""
|
||
echo "Finished!"
|
||
echo ""
|
||
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!"
|
||
fi
|
||
exit 0;
|