mirror of
https://github.com/namibia/openvpn-install.git
synced 2024-12-22 06:48:55 +00:00
e1f19e0f24
The script does work when seeip.org is unreachable, so I changed the policy to define the public IP. It solves the issue #1241 * Timeout limit on each try to solve the IP to avoid long waits; * Extra public IP providers as failovers; * the script only will try to solve an IP if the ENDPOINT is empty; Co-authored-by: Stanislas <github@slange.me>
1379 lines
41 KiB
Bash
Executable File
1379 lines
41 KiB
Bash
Executable File
#!/bin/bash
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# shellcheck disable=SC1091,SC2164,SC2034,SC1072,SC1073,SC1009
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# Secure OpenVPN server installer for Debian, Ubuntu, CentOS, Amazon Linux 2, Fedora, Oracle Linux 8, Arch Linux, Rocky Linux and AlmaLinux.
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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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source /etc/os-release
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if [[ $ID == "debian" || $ID == "raspbian" ]]; then
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if [[ $VERSION_ID -lt 9 ]]; then
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echo "⚠️ Your version of Debian is not supported."
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echo ""
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echo "However, if you're using Debian >= 9 or unstable/testing then you can continue, at your own risk."
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echo ""
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until [[ $CONTINUE =~ (y|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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exit 1
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fi
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fi
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elif [[ $ID == "ubuntu" ]]; then
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OS="ubuntu"
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MAJOR_UBUNTU_VERSION=$(echo "$VERSION_ID" | cut -d '.' -f1)
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if [[ $MAJOR_UBUNTU_VERSION -lt 16 ]]; then
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echo "⚠️ Your version of Ubuntu is not supported."
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echo ""
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echo "However, if you're using Ubuntu >= 16.04 or beta, then you can continue, at your own risk."
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echo ""
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until [[ $CONTINUE =~ (y|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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exit 1
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fi
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fi
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fi
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elif [[ -e /etc/system-release ]]; then
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source /etc/os-release
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if [[ $ID == "fedora" || $ID_LIKE == "fedora" ]]; then
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OS="fedora"
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fi
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if [[ $ID == "centos" || $ID == "rocky" || $ID == "almalinux" ]]; then
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OS="centos"
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if [[ ${VERSION_ID%.*} -lt 7 ]]; then
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echo "⚠️ Your version of CentOS is not supported."
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echo ""
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echo "The script only support CentOS 7 and CentOS 8."
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echo ""
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exit 1
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fi
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fi
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if [[ $ID == "ol" ]]; then
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OS="oracle"
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if [[ ! $VERSION_ID =~ (8) ]]; then
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echo "Your version of Oracle Linux is not supported."
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echo ""
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echo "The script only support Oracle Linux 8."
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exit 1
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fi
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fi
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if [[ $ID == "amzn" ]]; then
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OS="amzn"
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if [[ $VERSION_ID != "2" ]]; then
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echo "⚠️ Your version of Amazon Linux is not supported."
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echo ""
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echo "The script only support Amazon Linux 2."
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echo ""
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exit 1
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fi
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fi
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elif [[ -e /etc/arch-release ]]; then
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OS=arch
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else
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echo "Looks like you aren't running this installer on a Debian, Ubuntu, Fedora, CentOS, Amazon Linux 2, Oracle Linux 8 or Arch Linux 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 Unbound isn't installed, install it
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if [[ ! -e /etc/unbound/unbound.conf ]]; then
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if [[ $OS =~ (debian|ubuntu) ]]; 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 [[ $OS =~ (centos|amzn|oracle) ]]; then
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yum install -y unbound
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# Configuration
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sed -i 's|# interface: 0.0.0.0$|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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elif [[ $OS == "arch" ]]; then
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pacman -Syu --noconfirm unbound
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# Get root servers list
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curl -o /etc/unbound/root.hints https://www.internic.net/domain/named.cache
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if [[ ! -f /etc/unbound/unbound.conf.old ]]; then
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mv /etc/unbound/unbound.conf /etc/unbound/unbound.conf.old
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fi
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echo 'server:
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use-syslog: yes
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do-daemonize: no
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username: "unbound"
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directory: "/etc/unbound"
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trust-anchor-file: trusted-key.key
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root-hints: root.hints
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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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port: 53
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num-threads: 2
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use-caps-for-id: yes
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harden-glue: yes
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hide-identity: yes
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hide-version: yes
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qname-minimisation: yes
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prefetch: yes' >/etc/unbound/unbound.conf
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fi
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# IPv6 DNS for all OS
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if [[ $IPV6_SUPPORT == 'y' ]]; then
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echo 'interface: fd42:42:42:42::1
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access-control: fd42:42:42:42::/112 allow' >>/etc/unbound/unbound.conf
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fi
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if [[ ! $OS =~ (fedora|centos|amzn|oracle) ]]; 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: fd42:42:42:42::/112
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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: fd42:42:42:42::/112
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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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if [[ $IPV6_SUPPORT == 'y' ]]; then
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echo 'interface: fd42:42:42:42::1
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access-control: fd42:42:42:42::/112 allow' >>/etc/unbound/openvpn.conf
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fi
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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 resolvePublicIP() {
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# IP version flags, we'll use as default the IPv4
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CURL_IP_VERSION_FLAG="-4"
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DIG_IP_VERSION_FLAG="-4"
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# Behind NAT, we'll default to the publicly reachable IPv4/IPv6.
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if [[ $IPV6_SUPPORT == "y" ]]; then
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CURL_IP_VERSION_FLAG=""
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DIG_IP_VERSION_FLAG="-6"
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fi
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# If there is no public ip yet, we'll try to solve it using: https://api.seeip.org
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if [[ -z $PUBLIC_IP ]]; then
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PUBLIC_IP=$(curl -f -m 5 -sS --retry 2 --retry-connrefused "$CURL_IP_VERSION_FLAG" https://api.seeip.org 2>/dev/null)
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fi
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# If there is no public ip yet, we'll try to solve it using: https://ifconfig.me
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if [[ -z $PUBLIC_IP ]]; then
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PUBLIC_IP=$(curl -f -m 5 -sS --retry 2 --retry-connrefused "$CURL_IP_VERSION_FLAG" https://ifconfig.me 2>/dev/null)
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fi
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# If there is no public ip yet, we'll try to solve it using: https://api.ipify.org
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if [[ -z $PUBLIC_IP ]]; then
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PUBLIC_IP=$(curl -f -m 5 -sS --retry 2 --retry-connrefused "$CURL_IP_VERSION_FLAG" https://api.ipify.org 2>/dev/null)
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fi
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# If there is no public ip yet, we'll try to solve it using: ns1.google.com
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if [[ -z $PUBLIC_IP ]]; then
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PUBLIC_IP=$(dig $DIG_IP_VERSION_FLAG TXT +short o-o.myaddr.l.google.com @ns1.google.com | tr -d '"')
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fi
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if [[ -z $PUBLIC_IP ]]; then
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echo >&2 echo "Couldn't solve the public IP"
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exit 1
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fi
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echo "$PUBLIC_IP"
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}
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function installQuestions() {
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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 -4 addr | sed -ne 's|^.* inet \([^/]*\)/.* scope global.*$|\1|p' | head -1)
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if [[ -z $IP ]]; then
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# Detect public IPv6 address
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IP=$(ip -6 addr | sed -ne 's|^.* inet6 \([^/]*\)/.* scope global.*$|\1|p' | head -1)
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fi
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APPROVE_IP=${APPROVE_IP:-n}
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if [[ $APPROVE_IP =~ n ]]; then
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read -rp "IP address: " -e -i "$IP" IP
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fi
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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 or hostname?"
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echo "We need it for the clients to connect to the server."
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if [[ -z $ENDPOINT ]]; then
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DEFAULT_ENDPOINT=$(resolvePublicIP)
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fi
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until [[ $ENDPOINT != "" ]]; do
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read -rp "Public IPv4 address or hostname: " -e -i "$DEFAULT_ENDPOINT" ENDPOINT
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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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# "ping6" and "ping -6" availability varies depending on the distribution
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if type ping6 >/dev/null 2>&1; then
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PING6="ping6 -c3 ipv6.google.com > /dev/null 2>&1"
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else
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PING6="ping -6 -c3 ipv6.google.com > /dev/null 2>&1"
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fi
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if eval "$PING6"; 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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until [[ $IPV6_SUPPORT =~ (y|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 shouldn'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) Quad9 uncensored (Anycast: worldwide)"
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echo " 6) FDN (France)"
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echo " 7) DNS.WATCH (Germany)"
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echo " 8) OpenDNS (Anycast: worldwide)"
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echo " 9) Google (Anycast: worldwide)"
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echo " 10) Yandex Basic (Russia)"
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echo " 11) AdGuard DNS (Anycast: worldwide)"
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echo " 12) NextDNS (Anycast: worldwide)"
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echo " 13) Custom"
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until [[ $DNS =~ ^[0-9]+$ ]] && [ "$DNS" -ge 1 ] && [ "$DNS" -le 13 ]; do
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read -rp "DNS [1-12]: " -e -i 11 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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until [[ $CONTINUE =~ (y|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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elif [[ $DNS == "13" ]]; then
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until [[ $DNS1 =~ ^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$ ]]; do
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read -rp "Primary DNS: " -e DNS1
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done
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until [[ $DNS2 =~ ^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$ ]]; do
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read -rp "Secondary DNS (optional): " -e DNS2
|
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if [[ $DNS2 == "" ]]; then
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break
|
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fi
|
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done
|
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fi
|
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done
|
||
echo ""
|
||
echo "Do you want to use compression? It is not recommended since the VORACLE attack makes use of it."
|
||
until [[ $COMPRESSION_ENABLED =~ (y|n) ]]; do
|
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read -rp"Enable compression? [y/n]: " -e -i n COMPRESSION_ENABLED
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done
|
||
if [[ $COMPRESSION_ENABLED == "y" ]]; then
|
||
echo "Choose which compression algorithm you want to use: (they are ordered by efficiency)"
|
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echo " 1) LZ4-v2"
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echo " 2) LZ4"
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echo " 3) LZ0"
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||
until [[ $COMPRESSION_CHOICE =~ ^[1-3]$ ]]; do
|
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read -rp"Compression algorithm [1-3]: " -e -i 1 COMPRESSION_CHOICE
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done
|
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case $COMPRESSION_CHOICE in
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1)
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COMPRESSION_ALG="lz4-v2"
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;;
|
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2)
|
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COMPRESSION_ALG="lz4"
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;;
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||
3)
|
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COMPRESSION_ALG="lzo"
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;;
|
||
esac
|
||
fi
|
||
echo ""
|
||
echo "Do you want to customize encryption settings?"
|
||
echo "Unless you know what you're doing, you should stick with the default parameters provided by the script."
|
||
echo "Note that whatever you choose, all the choices presented in the script are safe. (Unlike OpenVPN's defaults)"
|
||
echo "See https://github.com/angristan/openvpn-install#security-and-encryption to learn more."
|
||
echo ""
|
||
until [[ $CUSTOMIZE_ENC =~ (y|n) ]]; do
|
||
read -rp "Customize encryption settings? [y/n]: " -e -i n CUSTOMIZE_ENC
|
||
done
|
||
if [[ $CUSTOMIZE_ENC == "n" ]]; then
|
||
# Use default, sane and fast parameters
|
||
CIPHER="AES-128-GCM"
|
||
CERT_TYPE="1" # ECDSA
|
||
CERT_CURVE="prime256v1"
|
||
CC_CIPHER="TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256"
|
||
DH_TYPE="1" # ECDH
|
||
DH_CURVE="prime256v1"
|
||
HMAC_ALG="SHA256"
|
||
TLS_SIG="1" # tls-crypt
|
||
else
|
||
echo ""
|
||
echo "Choose which cipher you want to use for the data channel:"
|
||
echo " 1) AES-128-GCM (recommended)"
|
||
echo " 2) AES-192-GCM"
|
||
echo " 3) AES-256-GCM"
|
||
echo " 4) AES-128-CBC"
|
||
echo " 5) AES-192-CBC"
|
||
echo " 6) AES-256-CBC"
|
||
until [[ $CIPHER_CHOICE =~ ^[1-6]$ ]]; do
|
||
read -rp "Cipher [1-6]: " -e -i 1 CIPHER_CHOICE
|
||
done
|
||
case $CIPHER_CHOICE in
|
||
1)
|
||
CIPHER="AES-128-GCM"
|
||
;;
|
||
2)
|
||
CIPHER="AES-192-GCM"
|
||
;;
|
||
3)
|
||
CIPHER="AES-256-GCM"
|
||
;;
|
||
4)
|
||
CIPHER="AES-128-CBC"
|
||
;;
|
||
5)
|
||
CIPHER="AES-192-CBC"
|
||
;;
|
||
6)
|
||
CIPHER="AES-256-CBC"
|
||
;;
|
||
esac
|
||
echo ""
|
||
echo "Choose what kind of certificate you want to use:"
|
||
echo " 1) ECDSA (recommended)"
|
||
echo " 2) RSA"
|
||
until [[ $CERT_TYPE =~ ^[1-2]$ ]]; do
|
||
read -rp"Certificate key type [1-2]: " -e -i 1 CERT_TYPE
|
||
done
|
||
case $CERT_TYPE in
|
||
1)
|
||
echo ""
|
||
echo "Choose which curve you want to use for the certificate's key:"
|
||
echo " 1) prime256v1 (recommended)"
|
||
echo " 2) secp384r1"
|
||
echo " 3) secp521r1"
|
||
until [[ $CERT_CURVE_CHOICE =~ ^[1-3]$ ]]; do
|
||
read -rp"Curve [1-3]: " -e -i 1 CERT_CURVE_CHOICE
|
||
done
|
||
case $CERT_CURVE_CHOICE in
|
||
1)
|
||
CERT_CURVE="prime256v1"
|
||
;;
|
||
2)
|
||
CERT_CURVE="secp384r1"
|
||
;;
|
||
3)
|
||
CERT_CURVE="secp521r1"
|
||
;;
|
||
esac
|
||
;;
|
||
2)
|
||
echo ""
|
||
echo "Choose which size you want to use for the certificate's RSA key:"
|
||
echo " 1) 2048 bits (recommended)"
|
||
echo " 2) 3072 bits"
|
||
echo " 3) 4096 bits"
|
||
until [[ $RSA_KEY_SIZE_CHOICE =~ ^[1-3]$ ]]; do
|
||
read -rp "RSA key size [1-3]: " -e -i 1 RSA_KEY_SIZE_CHOICE
|
||
done
|
||
case $RSA_KEY_SIZE_CHOICE in
|
||
1)
|
||
RSA_KEY_SIZE="2048"
|
||
;;
|
||
2)
|
||
RSA_KEY_SIZE="3072"
|
||
;;
|
||
3)
|
||
RSA_KEY_SIZE="4096"
|
||
;;
|
||
esac
|
||
;;
|
||
esac
|
||
echo ""
|
||
echo "Choose which cipher you want to use for the control channel:"
|
||
case $CERT_TYPE in
|
||
1)
|
||
echo " 1) ECDHE-ECDSA-AES-128-GCM-SHA256 (recommended)"
|
||
echo " 2) ECDHE-ECDSA-AES-256-GCM-SHA384"
|
||
until [[ $CC_CIPHER_CHOICE =~ ^[1-2]$ ]]; do
|
||
read -rp"Control channel cipher [1-2]: " -e -i 1 CC_CIPHER_CHOICE
|
||
done
|
||
case $CC_CIPHER_CHOICE in
|
||
1)
|
||
CC_CIPHER="TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256"
|
||
;;
|
||
2)
|
||
CC_CIPHER="TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384"
|
||
;;
|
||
esac
|
||
;;
|
||
2)
|
||
echo " 1) ECDHE-RSA-AES-128-GCM-SHA256 (recommended)"
|
||
echo " 2) ECDHE-RSA-AES-256-GCM-SHA384"
|
||
until [[ $CC_CIPHER_CHOICE =~ ^[1-2]$ ]]; do
|
||
read -rp"Control channel cipher [1-2]: " -e -i 1 CC_CIPHER_CHOICE
|
||
done
|
||
case $CC_CIPHER_CHOICE in
|
||
1)
|
||
CC_CIPHER="TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256"
|
||
;;
|
||
2)
|
||
CC_CIPHER="TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384"
|
||
;;
|
||
esac
|
||
;;
|
||
esac
|
||
echo ""
|
||
echo "Choose what kind of Diffie-Hellman key you want to use:"
|
||
echo " 1) ECDH (recommended)"
|
||
echo " 2) DH"
|
||
until [[ $DH_TYPE =~ [1-2] ]]; do
|
||
read -rp"DH key type [1-2]: " -e -i 1 DH_TYPE
|
||
done
|
||
case $DH_TYPE in
|
||
1)
|
||
echo ""
|
||
echo "Choose which curve you want to use for the ECDH key:"
|
||
echo " 1) prime256v1 (recommended)"
|
||
echo " 2) secp384r1"
|
||
echo " 3) secp521r1"
|
||
while [[ $DH_CURVE_CHOICE != "1" && $DH_CURVE_CHOICE != "2" && $DH_CURVE_CHOICE != "3" ]]; do
|
||
read -rp"Curve [1-3]: " -e -i 1 DH_CURVE_CHOICE
|
||
done
|
||
case $DH_CURVE_CHOICE in
|
||
1)
|
||
DH_CURVE="prime256v1"
|
||
;;
|
||
2)
|
||
DH_CURVE="secp384r1"
|
||
;;
|
||
3)
|
||
DH_CURVE="secp521r1"
|
||
;;
|
||
esac
|
||
;;
|
||
2)
|
||
echo ""
|
||
echo "Choose what size of Diffie-Hellman key you want to use:"
|
||
echo " 1) 2048 bits (recommended)"
|
||
echo " 2) 3072 bits"
|
||
echo " 3) 4096 bits"
|
||
until [[ $DH_KEY_SIZE_CHOICE =~ ^[1-3]$ ]]; do
|
||
read -rp "DH key size [1-3]: " -e -i 1 DH_KEY_SIZE_CHOICE
|
||
done
|
||
case $DH_KEY_SIZE_CHOICE in
|
||
1)
|
||
DH_KEY_SIZE="2048"
|
||
;;
|
||
2)
|
||
DH_KEY_SIZE="3072"
|
||
;;
|
||
3)
|
||
DH_KEY_SIZE="4096"
|
||
;;
|
||
esac
|
||
;;
|
||
esac
|
||
echo ""
|
||
# The "auth" options behaves differently with AEAD ciphers
|
||
if [[ $CIPHER =~ CBC$ ]]; then
|
||
echo "The digest algorithm authenticates data channel packets and tls-auth packets from the control channel."
|
||
elif [[ $CIPHER =~ GCM$ ]]; then
|
||
echo "The digest algorithm authenticates tls-auth packets from the control channel."
|
||
fi
|
||
echo "Which digest algorithm do you want to use for HMAC?"
|
||
echo " 1) SHA-256 (recommended)"
|
||
echo " 2) SHA-384"
|
||
echo " 3) SHA-512"
|
||
until [[ $HMAC_ALG_CHOICE =~ ^[1-3]$ ]]; do
|
||
read -rp "Digest algorithm [1-3]: " -e -i 1 HMAC_ALG_CHOICE
|
||
done
|
||
case $HMAC_ALG_CHOICE in
|
||
1)
|
||
HMAC_ALG="SHA256"
|
||
;;
|
||
2)
|
||
HMAC_ALG="SHA384"
|
||
;;
|
||
3)
|
||
HMAC_ALG="SHA512"
|
||
;;
|
||
esac
|
||
echo ""
|
||
echo "You can add an additional layer of security to the control channel with tls-auth and tls-crypt"
|
||
echo "tls-auth authenticates the packets, while tls-crypt authenticate and encrypt them."
|
||
echo " 1) tls-crypt (recommended)"
|
||
echo " 2) tls-auth"
|
||
until [[ $TLS_SIG =~ [1-2] ]]; do
|
||
read -rp "Control channel additional security mechanism [1-2]: " -e -i 1 TLS_SIG
|
||
done
|
||
fi
|
||
echo ""
|
||
echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now."
|
||
echo "You will be able to generate a client at the end of the installation."
|
||
APPROVE_INSTALL=${APPROVE_INSTALL:-n}
|
||
if [[ $APPROVE_INSTALL =~ n ]]; then
|
||
read -n1 -r -p "Press any key to continue..."
|
||
fi
|
||
}
|
||
|
||
function installOpenVPN() {
|
||
if [[ $AUTO_INSTALL == "y" ]]; then
|
||
# Set default choices so that no questions will be asked.
|
||
APPROVE_INSTALL=${APPROVE_INSTALL:-y}
|
||
APPROVE_IP=${APPROVE_IP:-y}
|
||
IPV6_SUPPORT=${IPV6_SUPPORT:-n}
|
||
PORT_CHOICE=${PORT_CHOICE:-1}
|
||
PROTOCOL_CHOICE=${PROTOCOL_CHOICE:-1}
|
||
DNS=${DNS:-1}
|
||
COMPRESSION_ENABLED=${COMPRESSION_ENABLED:-n}
|
||
CUSTOMIZE_ENC=${CUSTOMIZE_ENC:-n}
|
||
CLIENT=${CLIENT:-client}
|
||
PASS=${PASS:-1}
|
||
CONTINUE=${CONTINUE:-y}
|
||
|
||
if [[ -z $ENDPOINT ]]; then
|
||
ENDPOINT=$(resolvePublicIP)
|
||
fi
|
||
fi
|
||
|
||
# Run setup questions first, and set other variables if auto-install
|
||
installQuestions
|
||
|
||
# Get the "public" interface from the default route
|
||
NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | head -1)
|
||
if [[ -z $NIC ]] && [[ $IPV6_SUPPORT == 'y' ]]; then
|
||
NIC=$(ip -6 route show default | sed -ne 's/^default .* dev \([^ ]*\) .*$/\1/p')
|
||
fi
|
||
|
||
# $NIC can not be empty for script rm-openvpn-rules.sh
|
||
if [[ -z $NIC ]]; then
|
||
echo
|
||
echo "Can not detect public interface."
|
||
echo "This needs for setup MASQUERADE."
|
||
until [[ $CONTINUE =~ (y|n) ]]; do
|
||
read -rp "Continue? [y/n]: " -e CONTINUE
|
||
done
|
||
if [[ $CONTINUE == "n" ]]; then
|
||
exit 1
|
||
fi
|
||
fi
|
||
|
||
# If OpenVPN isn't installed yet, install it. This script is more-or-less
|
||
# idempotent on multiple runs, but will only install OpenVPN from upstream
|
||
# the first time.
|
||
if [[ ! -e /etc/openvpn/server.conf ]]; then
|
||
if [[ $OS =~ (debian|ubuntu) ]]; then
|
||
apt-get update
|
||
apt-get -y install ca-certificates gnupg
|
||
# We add the OpenVPN repo to get the latest version.
|
||
if [[ $VERSION_ID == "16.04" ]]; then
|
||
echo "deb http://build.openvpn.net/debian/openvpn/stable xenial 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 >= 2.4 without the need of a third party repository.
|
||
apt-get install -y openvpn iptables openssl wget ca-certificates curl
|
||
elif [[ $OS == 'centos' ]]; then
|
||
yum install -y epel-release
|
||
yum install -y openvpn iptables openssl wget ca-certificates curl tar 'policycoreutils-python*'
|
||
elif [[ $OS == 'oracle' ]]; then
|
||
yum install -y oracle-epel-release-el8
|
||
yum-config-manager --enable ol8_developer_EPEL
|
||
yum install -y openvpn iptables openssl wget ca-certificates curl tar policycoreutils-python-utils
|
||
elif [[ $OS == 'amzn' ]]; then
|
||
amazon-linux-extras install -y epel
|
||
yum install -y openvpn iptables openssl wget ca-certificates curl
|
||
elif [[ $OS == 'fedora' ]]; then
|
||
dnf install -y openvpn iptables openssl wget ca-certificates curl policycoreutils-python-utils
|
||
elif [[ $OS == 'arch' ]]; then
|
||
# Install required dependencies and upgrade the system
|
||
pacman --needed --noconfirm -Syu openvpn iptables openssl wget ca-certificates curl
|
||
fi
|
||
# An old version of easy-rsa was available by default in some openvpn packages
|
||
if [[ -d /etc/openvpn/easy-rsa/ ]]; then
|
||
rm -rf /etc/openvpn/easy-rsa/
|
||
fi
|
||
fi
|
||
|
||
# Find out if the machine uses nogroup or nobody for the permissionless group
|
||
if grep -qs "^nogroup:" /etc/group; then
|
||
NOGROUP=nogroup
|
||
else
|
||
NOGROUP=nobody
|
||
fi
|
||
|
||
# Install the latest version of easy-rsa from source, if not already installed.
|
||
if [[ ! -d /etc/openvpn/easy-rsa/ ]]; then
|
||
local version="3.1.2"
|
||
wget -O ~/easy-rsa.tgz https://github.com/OpenVPN/easy-rsa/releases/download/v${version}/EasyRSA-${version}.tgz
|
||
mkdir -p /etc/openvpn/easy-rsa
|
||
tar xzf ~/easy-rsa.tgz --strip-components=1 --no-same-owner --directory /etc/openvpn/easy-rsa
|
||
rm -f ~/easy-rsa.tgz
|
||
|
||
cd /etc/openvpn/easy-rsa/ || return
|
||
case $CERT_TYPE in
|
||
1)
|
||
echo "set_var EASYRSA_ALGO ec" >vars
|
||
echo "set_var EASYRSA_CURVE $CERT_CURVE" >>vars
|
||
;;
|
||
2)
|
||
echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" >vars
|
||
;;
|
||
esac
|
||
|
||
# Generate a random, alphanumeric identifier of 16 characters for CN and one for server name
|
||
SERVER_CN="cn_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
|
||
echo "$SERVER_CN" >SERVER_CN_GENERATED
|
||
SERVER_NAME="server_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
|
||
echo "$SERVER_NAME" >SERVER_NAME_GENERATED
|
||
|
||
# Create the PKI, set up the CA, the DH params and the server certificate
|
||
./easyrsa init-pki
|
||
EASYRSA_CA_EXPIRE=3650 ./easyrsa --batch --req-cn="$SERVER_CN" build-ca nopass
|
||
|
||
if [[ $DH_TYPE == "2" ]]; then
|
||
# ECDH keys are generated on-the-fly so we don't need to generate them beforehand
|
||
openssl dhparam -out dh.pem $DH_KEY_SIZE
|
||
fi
|
||
|
||
EASYRSA_CERT_EXPIRE=3650 ./easyrsa --batch build-server-full "$SERVER_NAME" nopass
|
||
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
|
||
|
||
case $TLS_SIG in
|
||
1)
|
||
# Generate tls-crypt key
|
||
openvpn --genkey --secret /etc/openvpn/tls-crypt.key
|
||
;;
|
||
2)
|
||
# Generate tls-auth key
|
||
openvpn --genkey --secret /etc/openvpn/tls-auth.key
|
||
;;
|
||
esac
|
||
else
|
||
# If easy-rsa is already installed, grab the generated SERVER_NAME
|
||
# for client configs
|
||
cd /etc/openvpn/easy-rsa/ || return
|
||
SERVER_NAME=$(cat SERVER_NAME_GENERATED)
|
||
fi
|
||
|
||
# Move all the generated files
|
||
cp pki/ca.crt pki/private/ca.key "pki/issued/$SERVER_NAME.crt" "pki/private/$SERVER_NAME.key" /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
|
||
if [[ $DH_TYPE == "2" ]]; then
|
||
cp dh.pem /etc/openvpn
|
||
fi
|
||
|
||
# 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_SUPPORT == 'n' ]]; then
|
||
echo "proto $PROTOCOL" >>/etc/openvpn/server.conf
|
||
elif [[ $IPV6_SUPPORT == 'y' ]]; then
|
||
echo "proto ${PROTOCOL}6" >>/etc/openvpn/server.conf
|
||
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) # Current system resolvers
|
||
# 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
|
||
sed -ne 's/^nameserver[[:space:]]\+\([^[:space:]]\+\).*$/\1/p' $RESOLVCONF | while read -r line; do
|
||
# Copy, if it's a IPv4 |or| if IPv6 is enabled, IPv4/IPv6 does not matter
|
||
if [[ $line =~ ^[0-9.]*$ ]] || [[ $IPV6_SUPPORT == 'y' ]]; then
|
||
echo "push \"dhcp-option DNS $line\"" >>/etc/openvpn/server.conf
|
||
fi
|
||
done
|
||
;;
|
||
2) # Self-hosted DNS resolver (Unbound)
|
||
echo 'push "dhcp-option DNS 10.8.0.1"' >>/etc/openvpn/server.conf
|
||
if [[ $IPV6_SUPPORT == 'y' ]]; then
|
||
echo 'push "dhcp-option DNS fd42:42:42:42::1"' >>/etc/openvpn/server.conf
|
||
fi
|
||
;;
|
||
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) # Quad9 uncensored
|
||
echo 'push "dhcp-option DNS 9.9.9.10"' >>/etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 149.112.112.10"' >>/etc/openvpn/server.conf
|
||
;;
|
||
6) # 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
|
||
;;
|
||
7) # 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
|
||
;;
|
||
8) # 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
|
||
;;
|
||
9) # 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
|
||
;;
|
||
10) # 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
|
||
;;
|
||
11) # AdGuard DNS
|
||
echo 'push "dhcp-option DNS 94.140.14.14"' >>/etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 94.140.15.15"' >>/etc/openvpn/server.conf
|
||
;;
|
||
12) # NextDNS
|
||
echo 'push "dhcp-option DNS 45.90.28.167"' >>/etc/openvpn/server.conf
|
||
echo 'push "dhcp-option DNS 45.90.30.167"' >>/etc/openvpn/server.conf
|
||
;;
|
||
13) # Custom DNS
|
||
echo "push \"dhcp-option DNS $DNS1\"" >>/etc/openvpn/server.conf
|
||
if [[ $DNS2 != "" ]]; then
|
||
echo "push \"dhcp-option DNS $DNS2\"" >>/etc/openvpn/server.conf
|
||
fi
|
||
;;
|
||
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
|
||
|
||
if [[ $COMPRESSION_ENABLED == "y" ]]; then
|
||
echo "compress $COMPRESSION_ALG" >>/etc/openvpn/server.conf
|
||
fi
|
||
|
||
if [[ $DH_TYPE == "1" ]]; then
|
||
echo "dh none" >>/etc/openvpn/server.conf
|
||
echo "ecdh-curve $DH_CURVE" >>/etc/openvpn/server.conf
|
||
elif [[ $DH_TYPE == "2" ]]; then
|
||
echo "dh dh.pem" >>/etc/openvpn/server.conf
|
||
fi
|
||
|
||
case $TLS_SIG in
|
||
1)
|
||
echo "tls-crypt tls-crypt.key" >>/etc/openvpn/server.conf
|
||
;;
|
||
2)
|
||
echo "tls-auth tls-auth.key 0" >>/etc/openvpn/server.conf
|
||
;;
|
||
esac
|
||
|
||
echo "crl-verify crl.pem
|
||
ca ca.crt
|
||
cert $SERVER_NAME.crt
|
||
key $SERVER_NAME.key
|
||
auth $HMAC_ALG
|
||
cipher $CIPHER
|
||
ncp-ciphers $CIPHER
|
||
tls-server
|
||
tls-version-min 1.2
|
||
tls-cipher $CC_CIPHER
|
||
client-config-dir /etc/openvpn/ccd
|
||
status /var/log/openvpn/status.log
|
||
verb 3" >>/etc/openvpn/server.conf
|
||
|
||
# Create client-config-dir dir
|
||
mkdir -p /etc/openvpn/ccd
|
||
# Create log dir
|
||
mkdir -p /var/log/openvpn
|
||
|
||
# Enable routing
|
||
echo 'net.ipv4.ip_forward=1' >/etc/sysctl.d/99-openvpn.conf
|
||
if [[ $IPV6_SUPPORT == 'y' ]]; then
|
||
echo 'net.ipv6.conf.all.forwarding=1' >>/etc/sysctl.d/99-openvpn.conf
|
||
fi
|
||
# Apply sysctl rules
|
||
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 == 'arch' || $OS == 'fedora' || $OS == 'centos' || $OS == 'oracle' ]]; then
|
||
# Don't modify package-provided service
|
||
cp /usr/lib/systemd/system/openvpn-server@.service /etc/systemd/system/openvpn-server@.service
|
||
|
||
# Workaround to fix OpenVPN service on OpenVZ
|
||
sed -i 's|LimitNPROC|#LimitNPROC|' /etc/systemd/system/openvpn-server@.service
|
||
# Another workaround to keep using /etc/openvpn/
|
||
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /etc/systemd/system/openvpn-server@.service
|
||
|
||
systemctl daemon-reload
|
||
systemctl enable openvpn-server@server
|
||
systemctl restart openvpn-server@server
|
||
elif [[ $OS == "ubuntu" ]] && [[ $VERSION_ID == "16.04" ]]; then
|
||
# On Ubuntu 16.04, we use the package from the OpenVPN repo
|
||
# This package uses a sysvinit service
|
||
systemctl enable openvpn
|
||
systemctl start openvpn
|
||
else
|
||
# Don't modify package-provided service
|
||
cp /lib/systemd/system/openvpn\@.service /etc/systemd/system/openvpn\@.service
|
||
|
||
# Workaround to fix OpenVPN service on OpenVZ
|
||
sed -i 's|LimitNPROC|#LimitNPROC|' /etc/systemd/system/openvpn\@.service
|
||
# Another workaround to keep using /etc/openvpn/
|
||
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /etc/systemd/system/openvpn\@.service
|
||
|
||
systemctl daemon-reload
|
||
systemctl enable openvpn@server
|
||
systemctl restart openvpn@server
|
||
fi
|
||
|
||
if [[ $DNS == 2 ]]; then
|
||
installUnbound
|
||
fi
|
||
|
||
# Add iptables rules in two scripts
|
||
mkdir -p /etc/iptables
|
||
|
||
# Script to add rules
|
||
echo "#!/bin/sh
|
||
iptables -t nat -I POSTROUTING 1 -s 10.8.0.0/24 -o $NIC -j MASQUERADE
|
||
iptables -I INPUT 1 -i tun0 -j ACCEPT
|
||
iptables -I FORWARD 1 -i $NIC -o tun0 -j ACCEPT
|
||
iptables -I FORWARD 1 -i tun0 -o $NIC -j ACCEPT
|
||
iptables -I INPUT 1 -i $NIC -p $PROTOCOL --dport $PORT -j ACCEPT" >/etc/iptables/add-openvpn-rules.sh
|
||
|
||
if [[ $IPV6_SUPPORT == 'y' ]]; then
|
||
echo "ip6tables -t nat -I POSTROUTING 1 -s fd42:42:42:42::/112 -o $NIC -j MASQUERADE
|
||
ip6tables -I INPUT 1 -i tun0 -j ACCEPT
|
||
ip6tables -I FORWARD 1 -i $NIC -o tun0 -j ACCEPT
|
||
ip6tables -I FORWARD 1 -i tun0 -o $NIC -j ACCEPT
|
||
ip6tables -I INPUT 1 -i $NIC -p $PROTOCOL --dport $PORT -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
|
||
ip6tables -D INPUT -i $NIC -p $PROTOCOL --dport $PORT -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-online.target
|
||
Wants=network-online.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 [[ $ENDPOINT != "" ]]; then
|
||
IP=$ENDPOINT
|
||
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
|
||
echo "explicit-exit-notify" >>/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 $HMAC_ALG
|
||
auth-nocache
|
||
cipher $CIPHER
|
||
tls-client
|
||
tls-version-min 1.2
|
||
tls-cipher $CC_CIPHER
|
||
ignore-unknown-option block-outside-dns
|
||
setenv opt block-outside-dns # Prevent Windows 10 DNS leak
|
||
verb 3" >>/etc/openvpn/client-template.txt
|
||
|
||
if [[ $COMPRESSION_ENABLED == "y" ]]; then
|
||
echo "compress $COMPRESSION_ALG" >>/etc/openvpn/client-template.txt
|
||
fi
|
||
|
||
# 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 "The name must consist of alphanumeric character. It may also include an underscore or a dash."
|
||
|
||
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
|
||
|
||
CLIENTEXISTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c -E "/CN=$CLIENT\$")
|
||
if [[ $CLIENTEXISTS == '1' ]]; then
|
||
echo ""
|
||
echo "The specified client CN was already found in easy-rsa, please choose another name."
|
||
exit
|
||
else
|
||
cd /etc/openvpn/easy-rsa/ || return
|
||
case $PASS in
|
||
1)
|
||
EASYRSA_CERT_EXPIRE=3650 ./easyrsa --batch build-client-full "$CLIENT" nopass
|
||
;;
|
||
2)
|
||
echo "⚠️ You will be asked for the client password below ⚠️"
|
||
EASYRSA_CERT_EXPIRE=3650 ./easyrsa --batch build-client-full "$CLIENT"
|
||
;;
|
||
esac
|
||
echo "Client $CLIENT added."
|
||
fi
|
||
|
||
# Home directory of the user, where the client configuration will be written
|
||
if [ -e "/home/${CLIENT}" ]; then
|
||
# if $1 is a user name
|
||
homeDir="/home/${CLIENT}"
|
||
elif [ "${SUDO_USER}" ]; then
|
||
# if not, use SUDO_USER
|
||
if [ "${SUDO_USER}" == "root" ]; then
|
||
# If running sudo as root
|
||
homeDir="/root"
|
||
else
|
||
homeDir="/home/${SUDO_USER}"
|
||
fi
|
||
else
|
||
# if not SUDO_USER, use /root
|
||
homeDir="/root"
|
||
fi
|
||
|
||
# Determine if we use tls-auth or tls-crypt
|
||
if grep -qs "^tls-crypt" /etc/openvpn/server.conf; then
|
||
TLS_SIG="1"
|
||
elif grep -qs "^tls-auth" /etc/openvpn/server.conf; then
|
||
TLS_SIG="2"
|
||
fi
|
||
|
||
# Generates the custom client.ovpn
|
||
cp /etc/openvpn/client-template.txt "$homeDir/$CLIENT.ovpn"
|
||
{
|
||
echo "<ca>"
|
||
cat "/etc/openvpn/easy-rsa/pki/ca.crt"
|
||
echo "</ca>"
|
||
|
||
echo "<cert>"
|
||
awk '/BEGIN/,/END CERTIFICATE/' "/etc/openvpn/easy-rsa/pki/issued/$CLIENT.crt"
|
||
echo "</cert>"
|
||
|
||
echo "<key>"
|
||
cat "/etc/openvpn/easy-rsa/pki/private/$CLIENT.key"
|
||
echo "</key>"
|
||
|
||
case $TLS_SIG in
|
||
1)
|
||
echo "<tls-crypt>"
|
||
cat /etc/openvpn/tls-crypt.key
|
||
echo "</tls-crypt>"
|
||
;;
|
||
2)
|
||
echo "key-direction 1"
|
||
echo "<tls-auth>"
|
||
cat /etc/openvpn/tls-auth.key
|
||
echo "</tls-auth>"
|
||
;;
|
||
esac
|
||
} >>"$homeDir/$CLIENT.ovpn"
|
||
|
||
echo ""
|
||
echo "The configuration file has been written to $homeDir/$CLIENT.ovpn."
|
||
echo "Download the .ovpn file and import it in your OpenVPN client."
|
||
|
||
exit 0
|
||
}
|
||
|
||
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 ') '
|
||
until [[ $CLIENTNUMBER -ge 1 && $CLIENTNUMBER -le $NUMBEROFCLIENTS ]]; do
|
||
if [[ $CLIENTNUMBER == '1' ]]; then
|
||
read -rp "Select one client [1]: " CLIENTNUMBER
|
||
else
|
||
read -rp "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
|
||
fi
|
||
done
|
||
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/ || return
|
||
./easyrsa --batch revoke "$CLIENT"
|
||
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
|
||
rm -f /etc/openvpn/crl.pem
|
||
cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
|
||
chmod 644 /etc/openvpn/crl.pem
|
||
find /home/ -maxdepth 2 -name "$CLIENT.ovpn" -delete
|
||
rm -f "/root/$CLIENT.ovpn"
|
||
sed -i "/^$CLIENT,.*/d" /etc/openvpn/ipp.txt
|
||
cp /etc/openvpn/easy-rsa/pki/index.txt{,.bk}
|
||
|
||
echo ""
|
||
echo "Certificate for client $CLIENT revoked."
|
||
}
|
||
|
||
function removeUnbound() {
|
||
# Remove OpenVPN-related config
|
||
sed -i '/include: \/etc\/unbound\/openvpn.conf/d' /etc/unbound/unbound.conf
|
||
rm /etc/unbound/openvpn.conf
|
||
|
||
until [[ $REMOVE_UNBOUND =~ (y|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|ubuntu) ]]; then
|
||
apt-get remove --purge -y unbound
|
||
elif [[ $OS == 'arch' ]]; then
|
||
pacman --noconfirm -R unbound
|
||
elif [[ $OS =~ (centos|amzn|oracle) ]]; then
|
||
yum remove -y unbound
|
||
elif [[ $OS == 'fedora' ]]; then
|
||
dnf remove -y unbound
|
||
fi
|
||
|
||
rm -rf /etc/unbound/
|
||
|
||
echo ""
|
||
echo "Unbound removed!"
|
||
else
|
||
systemctl restart unbound
|
||
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)
|
||
PROTOCOL=$(grep '^proto ' /etc/openvpn/server.conf | cut -d " " -f 2)
|
||
|
||
# Stop OpenVPN
|
||
if [[ $OS =~ (fedora|arch|centos|oracle) ]]; then
|
||
systemctl disable openvpn-server@server
|
||
systemctl stop openvpn-server@server
|
||
# Remove customised service
|
||
rm /etc/systemd/system/openvpn-server@.service
|
||
elif [[ $OS == "ubuntu" ]] && [[ $VERSION_ID == "16.04" ]]; then
|
||
systemctl disable openvpn
|
||
systemctl stop openvpn
|
||
else
|
||
systemctl disable openvpn@server
|
||
systemctl stop openvpn@server
|
||
# Remove customised service
|
||
rm /etc/systemd/system/openvpn\@.service
|
||
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 [[ $PORT != '1194' ]]; then
|
||
semanage port -d -t openvpn_port_t -p "$PROTOCOL" "$PORT"
|
||
fi
|
||
fi
|
||
fi
|
||
|
||
if [[ $OS =~ (debian|ubuntu) ]]; then
|
||
apt-get remove --purge -y openvpn
|
||
if [[ -e /etc/apt/sources.list.d/openvpn.list ]]; then
|
||
rm /etc/apt/sources.list.d/openvpn.list
|
||
apt-get update
|
||
fi
|
||
elif [[ $OS == 'arch' ]]; then
|
||
pacman --noconfirm -R openvpn
|
||
elif [[ $OS =~ (centos|amzn|oracle) ]]; then
|
||
yum remove -y openvpn
|
||
elif [[ $OS == 'fedora' ]]; then
|
||
dnf remove -y openvpn
|
||
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/99-openvpn.conf
|
||
rm -rf /var/log/openvpn
|
||
|
||
# Unbound
|
||
if [[ -e /etc/unbound/openvpn.conf ]]; then
|
||
removeUnbound
|
||
fi
|
||
echo ""
|
||
echo "OpenVPN removed!"
|
||
else
|
||
echo ""
|
||
echo "Removal aborted!"
|
||
fi
|
||
}
|
||
|
||
function manageMenu() {
|
||
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 && $AUTO_INSTALL != "y" ]]; then
|
||
manageMenu
|
||
else
|
||
installOpenVPN
|
||
fi
|