diff --git a/open_vpn_install b/open_vpn_install
new file mode 100644
index 0000000..571ea8a
--- /dev/null
+++ b/open_vpn_install
@@ -0,0 +1,1384 @@
+# Install OVPN and Create Users
+#!/bin/bash
+# shellcheck disable=SC1091,SC2164,SC2034,SC1072,SC1073,SC1009
+
+# Secure OpenVPN server installer for Debian, Ubuntu, CentOS, Amazon Linux 2, Fedora, Oracle Linux 8, Arch Linux, Rocky Linux and AlmaLinux.
+# https://github.com/angristan/openvpn-install
+
+function isRoot() {
+ if [ "$EUID" -ne 0 ]; then
+ return 1
+ fi
+}
+
+function tunAvailable() {
+ if [ ! -e /dev/net/tun ]; then
+ return 1
+ fi
+}
+
+function checkOS() {
+ if [[ -e /etc/debian_version ]]; then
+ OS="debian"
+ source /etc/os-release
+
+ if [[ $ID == "debian" || $ID == "raspbian" ]]; then
+ if [[ $VERSION_ID -lt 9 ]]; then
+ echo "⚠️ Your version of Debian is not supported."
+ echo ""
+ echo "However, if you're using Debian >= 9 or unstable/testing, you can continue at your own risk."
+ echo ""
+ until [[ $CONTINUE =~ (y|n) ]]; do
+ read -rp "Continue? [y/n]: " -e CONTINUE
+ done
+ if [[ $CONTINUE == "n" ]]; then
+ exit 1
+ fi
+ fi
+ elif [[ $ID == "ubuntu" ]]; then
+ OS="ubuntu"
+ MAJOR_UBUNTU_VERSION=$(echo "$VERSION_ID" | cut -d '.' -f1)
+ if [[ $MAJOR_UBUNTU_VERSION -lt 16 ]]; then
+ echo "⚠️ Your version of Ubuntu is not supported."
+ echo ""
+ echo "However, if you're using Ubuntu >= 16.04 or beta, you can continue at your own risk."
+ echo ""
+ until [[ $CONTINUE =~ (y|n) ]]; do
+ read -rp "Continue? [y/n]: " -e CONTINUE
+ done
+ if [[ $CONTINUE == "n" ]]; then
+ exit 1
+ fi
+ fi
+ fi
+ elif [[ -e /etc/system-release ]]; then
+ source /etc/os-release
+ if [[ $ID == "fedora" || $ID_LIKE == "fedora" ]]; then
+ OS="fedora"
+ fi
+ if [[ $ID == "centos" || $ID == "rocky" || $ID == "almalinux" ]]; then
+ OS="centos"
+ if [[ ${VERSION_ID%.*} -lt 7 ]]; then
+ echo "⚠️ Your version of CentOS is not supported."
+ echo ""
+ echo "The script only supports CentOS 7 and CentOS 8."
+ echo ""
+ exit 1
+ fi
+ fi
+ if [[ $ID == "ol" ]]; then
+ OS="oracle"
+ if [[ ! $VERSION_ID =~ (8) ]]; then
+ echo "Your version of Oracle Linux is not supported."
+ echo ""
+ echo "The script only supports Oracle Linux 8."
+ exit 1
+ fi
+ fi
+ if [[ $ID == "amzn" ]]; then
+ if [[ $VERSION_ID == "2" ]]; then
+ OS="amzn"
+ elif [[ "$(echo "$PRETTY_NAME" | cut -c 1-18)" == "Amazon Linux 2023." ]] && [[ "$(echo "$PRETTY_NAME" | cut -c 19)" -ge 6 ]]; then
+ OS="amzn2023"
+ else
+ echo "⚠️ Your version of Amazon Linux is not supported."
+ echo ""
+ echo "The script only supports Amazon Linux 2 or Amazon Linux 2023.6+"
+ echo ""
+ exit 1
+ fi
+ fi
+ elif [[ -e /etc/arch-release ]]; then
+ OS=arch
+ else
+ echo "It looks like you aren't running this installer on a Debian, Ubuntu, Fedora, CentOS, Amazon Linux 2, Oracle Linux 8 or Arch Linux system."
+ exit 1
+ fi
+}
+
+function initialCheck() {
+ if ! isRoot; then
+ echo "Sorry, you need to run this script as root."
+ exit 1
+ fi
+ if ! tunAvailable; then
+ echo "TUN is not available."
+ exit 1
+ fi
+ checkOS
+}
+
+function installUnbound() {
+ # If Unbound isn't installed, install it
+ if [[ ! -e /etc/unbound/unbound.conf ]]; then
+
+ if [[ $OS =~ (debian|ubuntu) ]]; then
+ apt-get install -y unbound
+
+ # Configuration
+ echo 'interface: 10.8.0.1
+access-control: 10.8.0.1/24 allow
+hide-identity: yes
+hide-version: yes
+use-caps-for-id: yes
+prefetch: yes' >>/etc/unbound/unbound.conf
+
+ elif [[ $OS =~ (centos|amzn|oracle) ]]; then
+ yum install -y unbound
+
+ # Configuration
+ sed -i 's|# interface: 0.0.0.0$|interface: 10.8.0.1|' /etc/unbound/unbound.conf
+ sed -i 's|# access-control: 127.0.0.0/8 allow|access-control: 10.8.0.1/24 allow|' /etc/unbound/unbound.conf
+ sed -i 's|# hide-identity: no|hide-identity: yes|' /etc/unbound/unbound.conf
+ sed -i 's|# hide-version: no|hide-version: yes|' /etc/unbound/unbound.conf
+ sed -i 's|use-caps-for-id: no|use-caps-for-id: yes|' /etc/unbound/unbound.conf
+
+ elif [[ $OS == "fedora" ]]; then
+ dnf install -y unbound
+
+ # Configuration
+ sed -i 's|# interface: 0.0.0.0$|interface: 10.8.0.1|' /etc/unbound/unbound.conf
+ sed -i 's|# access-control: 127.0.0.0/8 allow|access-control: 10.8.0.1/24 allow|' /etc/unbound/unbound.conf
+ sed -i 's|# hide-identity: no|hide-identity: yes|' /etc/unbound/unbound.conf
+ sed -i 's|# hide-version: no|hide-version: yes|' /etc/unbound/unbound.conf
+ sed -i 's|# use-caps-for-id: no|use-caps-for-id: yes|' /etc/unbound/unbound.conf
+
+ elif [[ $OS == "arch" ]]; then
+ pacman -Syu --noconfirm unbound
+
+ # Get root servers list
+ curl -o /etc/unbound/root.hints https://www.internic.net/domain/named.cache
+
+ if [[ ! -f /etc/unbound/unbound.conf.old ]]; then
+ mv /etc/unbound/unbound.conf /etc/unbound/unbound.conf.old
+ fi
+
+ echo 'server:
+ use-syslog: yes
+ do-daemonize: no
+ username: "unbound"
+ directory: "/etc/unbound"
+ trust-anchor-file: trusted-key.key
+ root-hints: root.hints
+ interface: 10.8.0.1
+ access-control: 10.8.0.1/24 allow
+ port: 53
+ num-threads: 2
+ use-caps-for-id: yes
+ harden-glue: yes
+ hide-identity: yes
+ hide-version: yes
+ qname-minimisation: yes
+ prefetch: yes' >/etc/unbound/unbound.conf
+ fi
+
+ # IPv6 DNS for all OS
+ if [[ $IPV6_SUPPORT == 'y' ]]; then
+ echo 'interface: fd42:42:42:42::1
+access-control: fd42:42:42:42::/112 allow' >>/etc/unbound/unbound.conf
+ fi
+
+ if [[ ! $OS =~ (fedora|centos|amzn|oracle) ]]; then
+ # DNS Rebinding fix
+ echo "private-address: 10.0.0.0/8
+private-address: fd42:42:42:42::/112
+private-address: 172.16.0.0/12
+private-address: 192.168.0.0/16
+private-address: 169.254.0.0/16
+private-address: fd00::/8
+private-address: fe80::/10
+private-address: 127.0.0.0/8
+private-address: ::ffff:0:0/96" >>/etc/unbound/unbound.conf
+ fi
+ else # Unbound is already installed
+ echo 'include: /etc/unbound/openvpn.conf' >>/etc/unbound/unbound.conf
+
+ # Add Unbound 'server' for the OpenVPN subnet
+ echo 'server:
+interface: 10.8.0.1
+access-control: 10.8.0.1/24 allow
+hide-identity: yes
+hide-version: yes
+use-caps-for-id: yes
+prefetch: yes
+private-address: 10.0.0.0/8
+private-address: fd42:42:42:42::/112
+private-address: 172.16.0.0/12
+private-address: 192.168.0.0/16
+private-address: 169.254.0.0/16
+private-address: fd00::/8
+private-address: fe80::/10
+private-address: 127.0.0.0/8
+private-address: ::ffff:0:0/96' >/etc/unbound/openvpn.conf
+ if [[ $IPV6_SUPPORT == 'y' ]]; then
+ echo 'interface: fd42:42:42:42::1
+access-control: fd42:42:42:42::/112 allow' >>/etc/unbound/openvpn.conf
+ fi
+ fi
+
+ systemctl enable unbound
+ systemctl restart unbound
+}
+
+function resolvePublicIP() {
+ # IP version flags, we'll use as default the IPv4
+ CURL_IP_VERSION_FLAG="-4"
+ DIG_IP_VERSION_FLAG="-4"
+
+ # Behind NAT, we'll default to the publicly reachable IPv4/IPv6.
+ if [[ $IPV6_SUPPORT == "y" ]]; then
+ CURL_IP_VERSION_FLAG=""
+ DIG_IP_VERSION_FLAG="-6"
+ fi
+
+ # If there is no public ip yet, we'll try to solve it using: https://api.seeip.org
+ if [[ -z $PUBLIC_IP ]]; then
+ PUBLIC_IP=$(curl -f -m 5 -sS --retry 2 --retry-connrefused "$CURL_IP_VERSION_FLAG" https://api.seeip.org 2>/dev/null)
+ fi
+
+ # If there is no public ip yet, we'll try to solve it using: https://ifconfig.me
+ if [[ -z $PUBLIC_IP ]]; then
+ PUBLIC_IP=$(curl -f -m 5 -sS --retry 2 --retry-connrefused "$CURL_IP_VERSION_FLAG" https://ifconfig.me 2>/dev/null)
+ fi
+
+ # If there is no public ip yet, we'll try to solve it using: https://api.ipify.org
+ if [[ -z $PUBLIC_IP ]]; then
+ PUBLIC_IP=$(curl -f -m 5 -sS --retry 2 --retry-connrefused "$CURL_IP_VERSION_FLAG" https://api.ipify.org 2>/dev/null)
+ fi
+
+ # If there is no public ip yet, we'll try to solve it using: ns1.google.com
+ if [[ -z $PUBLIC_IP ]]; then
+ PUBLIC_IP=$(dig $DIG_IP_VERSION_FLAG TXT +short o-o.myaddr.l.google.com @ns1.google.com | tr -d '"')
+ fi
+
+ if [[ -z $PUBLIC_IP ]]; then
+ echo >&2 echo "Couldn't solve the public IP"
+ exit 1
+ fi
+
+ echo "$PUBLIC_IP"
+}
+
+function installQuestions() {
+ echo "Welcome to the OpenVPN installer!"
+ echo "The git repository is available at: https://github.com/angristan/openvpn-install"
+ echo ""
+
+ echo "I need to ask you a few questions before starting the setup."
+ echo "You can leave the default options and just press enter if you are okay with them."
+ echo ""
+ echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
+ echo "Unless your server is behind NAT, it should be your public IPv4 address."
+
+ # Detect public IPv4 address and pre-fill for the user
+ IP=$(ip -4 addr | sed -ne 's|^.* inet \([^/]*\)/.* scope global.*$|\1|p' | head -1)
+
+ if [[ -z $IP ]]; then
+ # Detect public IPv6 address
+ IP=$(ip -6 addr | sed -ne 's|^.* inet6 \([^/]*\)/.* scope global.*$|\1|p' | head -1)
+ fi
+ APPROVE_IP=${APPROVE_IP:-n}
+ if [[ $APPROVE_IP =~ n ]]; then
+ read -rp "IP address: " -e -i "$IP" IP
+ fi
+ # If $IP is a private IP address, the server must be behind NAT
+ if echo "$IP" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
+ echo ""
+ echo "It seems this server is behind NAT. What is its public IPv4 address or hostname?"
+ echo "We need it for the clients to connect to the server."
+
+ if [[ -z $ENDPOINT ]]; then
+ DEFAULT_ENDPOINT=$(resolvePublicIP)
+ fi
+
+ until [[ $ENDPOINT != "" ]]; do
+ read -rp "Public IPv4 address or hostname: " -e -i "$DEFAULT_ENDPOINT" ENDPOINT
+ done
+ fi
+
+ echo ""
+ echo "Checking for IPv6 connectivity..."
+ echo ""
+ # "ping6" and "ping -6" availability varies depending on the distribution
+ if type ping6 >/dev/null 2>&1; then
+ PING6="ping6 -c3 ipv6.google.com > /dev/null 2>&1"
+ else
+ PING6="ping -6 -c3 ipv6.google.com > /dev/null 2>&1"
+ fi
+ if eval "$PING6"; then
+ echo "Your host appears to have IPv6 connectivity."
+ SUGGESTION="y"
+ else
+ echo "Your host does not appear to have IPv6 connectivity."
+ SUGGESTION="n"
+ fi
+ echo ""
+ # Ask the user if they want to enable IPv6 regardless its availability.
+ until [[ $IPV6_SUPPORT =~ (y|n) ]]; do
+ read -rp "Do you want to enable IPv6 support (NAT)? [y/n]: " -e -i $SUGGESTION IPV6_SUPPORT
+ done
+ echo ""
+ echo "What port do you want OpenVPN to listen to?"
+ echo " 1) Default: 1194"
+ echo " 2) Custom"
+ echo " 3) Random [49152-65535]"
+ until [[ $PORT_CHOICE =~ ^[1-3]$ ]]; do
+ read -rp "Port choice [1-3]: " -e -i 1 PORT_CHOICE
+ done
+ case $PORT_CHOICE in
+ 1)
+ PORT="1194"
+ ;;
+ 2)
+ until [[ $PORT =~ ^[0-9]+$ ]] && [ "$PORT" -ge 1 ] && [ "$PORT" -le 65535 ]; do
+ read -rp "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 OpenVPN to use?"
+ echo "UDP is faster. Unless it is not available, you shouldn't use TCP."
+ echo " 1) UDP"
+ echo " 2) TCP"
+ until [[ $PROTOCOL_CHOICE =~ ^[1-2]$ ]]; do
+ read -rp "Protocol [1-2]: " -e -i 1 PROTOCOL_CHOICE
+ done
+ case $PROTOCOL_CHOICE in
+ 1)
+ PROTOCOL="udp"
+ ;;
+ 2)
+ PROTOCOL="tcp"
+ ;;
+ esac
+ echo ""
+ echo "What DNS resolvers 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)"
+ echo " 4) Quad9 (Anycast: worldwide)"
+ echo " 5) Quad9 uncensored (Anycast: worldwide)"
+ echo " 6) FDN (France)"
+ echo " 7) DNS.WATCH (Germany)"
+ echo " 8) OpenDNS (Anycast: worldwide)"
+ echo " 9) Google (Anycast: worldwide)"
+ echo " 10) Yandex Basic (Russia)"
+ echo " 11) AdGuard DNS (Anycast: worldwide)"
+ echo " 12) NextDNS (Anycast: worldwide)"
+ echo " 13) Custom"
+ until [[ $DNS =~ ^[0-9]+$ ]] && [ "$DNS" -ge 1 ] && [ "$DNS" -le 13 ]; do
+ read -rp "DNS [1-12]: " -e -i 11 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 ""
+
+ until [[ $CONTINUE =~ (y|n) ]]; do
+ read -rp "Apply configuration changes to Unbound? [y/n]: " -e CONTINUE
+ done
+ if [[ $CONTINUE == "n" ]]; then
+ # Break the loop and cleanup
+ unset DNS
+ unset CONTINUE
+ fi
+ elif [[ $DNS == "13" ]]; then
+ 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
+ read -rp "Primary DNS: " -e DNS1
+ done
+ 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
+ read -rp "Secondary DNS (optional): " -e DNS2
+ if [[ $DNS2 == "" ]]; then
+ break
+ fi
+ done
+ fi
+ 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
+ read -rp"Enable compression? [y/n]: " -e -i n COMPRESSION_ENABLED
+ done
+ if [[ $COMPRESSION_ENABLED == "y" ]]; then
+ echo "Choose which compression algorithm you want to use: (they are ordered by efficiency)"
+ echo " 1) LZ4-v2"
+ echo " 2) LZ4"
+ echo " 3) LZ0"
+ until [[ $COMPRESSION_CHOICE =~ ^[1-3]$ ]]; do
+ read -rp"Compression algorithm [1-3]: " -e -i 1 COMPRESSION_CHOICE
+ done
+ case $COMPRESSION_CHOICE in
+ 1)
+ COMPRESSION_ALG="lz4-v2"
+ ;;
+ 2)
+ COMPRESSION_ALG="lz4"
+ ;;
+ 3)
+ COMPRESSION_ALG="lzo"
+ ;;
+ 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 "Could 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 == 'amzn2023' ]]; then
+ dnf install -y openvpn iptables openssl wget ca-certificates
+ 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' || $OS == 'amzn2023' ]]; 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/$CLIENT.ovpn"
+ {
+ echo ""
+ cat "/etc/openvpn/easy-rsa/pki/ca.crt"
+ echo ""
+
+ echo ""
+ awk '/BEGIN/,/END CERTIFICATE/' "/etc/openvpn/easy-rsa/pki/issued/$CLIENT.crt"
+ echo ""
+
+ echo ""
+ cat "/etc/openvpn/easy-rsa/pki/private/$CLIENT.key"
+ echo ""
+
+ case $TLS_SIG in
+ 1)
+ echo ""
+ cat /etc/openvpn/tls-crypt.key
+ echo ""
+ ;;
+ 2)
+ echo "key-direction 1"
+ echo ""
+ cat /etc/openvpn/tls-auth.key
+ echo ""
+ ;;
+ esac
+ } >>"$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