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centos7-vpn.sh
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centos7-vpn.sh
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#!/bin/bash
# Secure OpenVPN server installer for Debian, Ubuntu, CentOS, Fedora and Arch Linux
# 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" ]]; then
if [[ ! $VERSION_ID =~ (8|9) ]]; then
echo "⚠️ Your version of Debian is not supported."
echo ""
echo "However, if you're using Debian >= 9 or unstable/testing then you can continue."
echo "Keep in mind they are not supported, though."
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"
if [[ ! $VERSION_ID =~ (16.04|18.04) ]]; then
echo "⚠️ Your version of Ubuntu is not supported."
echo ""
echo "However, if you're using Ubuntu > 17 or beta, then you can continue."
echo "Keep in mind they are not supported, though."
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/fedora-release ]]; then
OS=fedora
elif [[ -e /etc/centos-release ]]; then
if ! grep -qs "^CentOS Linux release 7" /etc/centos-release; then
echo "Your version of CentOS is not supported."
echo "The script only support CentOS 7."
echo ""
unset CONTINUE
until [[ $CONTINUE =~ (y|n) ]]; do
read -rp "Continue anyway? [y/n]: " -e CONTINUE
done
if [[ "$CONTINUE" = "n" ]]; then
echo "Ok, bye!"
exit 1
fi
fi
OS=centos
elif [[ -e /etc/arch-release ]]; then
OS=arch
else
echo "Looks like you aren't running this installer on a Debian, Ubuntu, Fedora, CentOS or Arch Linux system"
exit 1
fi
}
function initialCheck () {
if ! isRoot; then
echo "Sorry, you need to run this as root"
exit 1
fi
if ! tunAvailable; then
echo "TUN is not available"
exit 1
fi
checkOS
}
function installUnbound () {
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" ]]; 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
mv /etc/unbound/unbound.conf /etc/unbound/unbound.conf.old
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
if [[ ! "$OS" =~ (fedora|centos) ]];then
# DNS Rebinding fix
echo "private-address: 10.0.0.0/8
private-address: 172.16.0.0/12
private-address: 192.168.0.0/16
private-address: 169.254.0.0/16
private-address: fd00::/8
private-address: fe80::/10
private-address: 127.0.0.0/8
private-address: ::ffff:0:0/96" >> /etc/unbound/unbound.conf
fi
else # Unbound is already installed
echo 'include: /etc/unbound/openvpn.conf' >> /etc/unbound/unbound.conf
# Add Unbound 'server' for the OpenVPN subnet
echo 'server:
interface: 10.8.0.1
access-control: 10.8.0.1/24 allow
hide-identity: yes
hide-version: yes
use-caps-for-id: yes
prefetch: yes
private-address: 10.0.0.0/8
private-address: 172.16.0.0/12
private-address: 192.168.0.0/16
private-address: 169.254.0.0/16
private-address: fd00::/8
private-address: fe80::/10
private-address: 127.0.0.0/8
private-address: ::ffff:0:0/96' > /etc/unbound/openvpn.conf
fi
systemctl enable unbound
systemctl restart unbound
}
function installQuestions () {
echo "Welcome to the OpenVPN installer!"
echo "The git repository is available at: https://github.com/angristan/openvpn-install"
echo ""
echo "I need to ask you a few questions before starting the setup."
echo "You can leave the default options and just press enter if you are ok with them."
echo ""
echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
echo "Unless your server is behind NAT, it should be your public IPv4 address."
# Detect public IPv4 address and pre-fill for the user
IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
read -rp "IP address: " -e -i "$IP" IP
# 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."
until [[ "$PUBLICIP" != "" ]]; do
read -rp "Public IPv4 address or hostname: " -e PUBLICIP
done
fi
echo ""
echo "Checking for IPv6 connectivity..."
echo ""
# "ping6" and "ping -6" availability varies depending on the distribution
if type ping6 > /dev/null 2>&1; then
PING6="ping6 -c3 ipv6.google.com > /dev/null 2>&1"
else
PING6="ping -6 -c3 ipv6.google.com > /dev/null 2>&1"
fi
if eval "$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 $PROTOCOL_CHOICE in
1)
PROTOCOL="udp"
;;
2)
PROTOCOL="tcp"
;;
esac
echo ""
echo "What DNS resolvers do you want to use with the VPN?"
echo " 1) Current system resolvers (from /etc/resolv.conf)"
echo " 2) Self-hosted DNS Resolver (Unbound)"
echo " 3) Cloudflare (Anycast: worldwide)"
echo " 4) Quad9 (Anycast: worldwide)"
echo " 5) Quad9 uncensored (Anycast: worldwide)"
echo " 6) FDN (France)"
echo " 7) DNS.WATCH (Germany)"
echo " 8) OpenDNS (Anycast: worldwide)"
echo " 9) Google (Anycast: worldwide)"
echo " 10) Yandex Basic (Russia)"
echo " 11) AdGuard DNS (Russia)"
until [[ "$DNS" =~ ^[0-9]+$ ]] && [ "$DNS" -ge 1 ] && [ "$DNS" -le 11 ]; do
read -rp "DNS [1-10]: " -e -i 3 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
fi
done
echo ""
echo "Do you want to use compression? It is not recommended since the VORACLE attack make 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:"
echo " 1) LZ4 (more efficient)"
echo " 2) LZ0"
until [[ $COMPRESSION_CHOICE =~ ^[1-2]$ ]]; do
read -rp"Compression algorithm [1-2]: " -e -i 1 COMPRESSION_CHOICE
done
case $COMPRESSION_CHOICE in
1)
COMPRESSION_ALG="lz4"
;;
2)
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 [[ $TLS_SIG =~ [1-2] ]]; do
read -rp "Control channel additional security mechanism [1-2]: " -e -i 1 TLS_SIG
done
fi
echo ""
echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now."
echo "You will be able to generate a client at the end of the installation."
read -n1 -r -p "Press any key to continue..."
}
function installOpenVPN () {
# Run setup questions first
installQuestions
# Get the "public" interface from the default route
NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | head -1)
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" = "8" ]]; then
echo "deb http://build.openvpn.net/debian/openvpn/stable jessie main" > /etc/apt/sources.list.d/openvpn.list
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
apt-get update
fi
if [[ "$VERSION_ID" = "16.04" ]]; then
echo "deb http://build.openvpn.net/debian/openvpn/stable trusty main" > /etc/apt/sources.list.d/openvpn.list
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
apt-get update
fi
# Ubuntu > 16.04 and Debian > 8 have OpenVPN >= 2.4 without the need of a third party repository.
apt-get install -y openvpn iptables openssl wget ca-certificates curl
elif [[ "$OS" = 'centos' ]]; then
yum install -y epel-release
yum install -y openvpn iptables openssl wget ca-certificates curl
elif [[ "$OS" = 'fedora' ]]; then
dnf install -y openvpn iptables openssl wget ca-certificates curl
elif [[ "$OS" = 'arch' ]]; then
echo ""
echo "WARNING: As you're using ArchLinux, I need to update the packages on your system to install those I need."
echo "Not doing that could cause problems between dependencies, or missing files in repositories (Arch Linux does not support partial upgrades)."
echo ""
echo "Continuing will update your installed packages and install needed ones."
echo ""
unset CONTINUE
until [[ $CONTINUE =~ (y|n) ]]; do
read -rp "Continue? [y/n]: " -e -i y CONTINUE
done
if [[ "$CONTINUE" = "n" ]]; then
echo "Exiting because user did not permit updating the system."
exit 4
fi
# Install required dependencies and upgrade the system
pacman --needed --noconfirm -Syu openvpn iptables openssl wget ca-certificates curl
fi
# Find out if the machine uses nogroup or nobody for the permissionless group
if grep -qs "^nogroup:" /etc/group; then
NOGROUP=nogroup
else
NOGROUP=nobody
fi
# An old version of easy-rsa was available by default in some openvpn packages
if [[ -d /etc/openvpn/easy-rsa/ ]]; then
rm -rf /etc/openvpn/easy-rsa/
fi
# Install the latest version of easy-rsa from source
local version="3.0.5"
wget -O ~/EasyRSA-nix-${version}.tgz https://github.com/OpenVPN/easy-rsa/releases/download/v${version}/EasyRSA-nix-${version}.tgz
tar xzf ~/EasyRSA-nix-${version}.tgz -C ~/
mv ~/EasyRSA-${version}/ /etc/openvpn/
mv /etc/openvpn/EasyRSA-${version}/ /etc/openvpn/easy-rsa/
chown -R root:root /etc/openvpn/easy-rsa/
rm -f ~/EasyRSA-nix-${version}.tgz
cd /etc/openvpn/easy-rsa/
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)"
SERVER_NAME="server_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
echo "set_var EASYRSA_REQ_CN $SERVER_CN" >> vars
# Create the PKI, set up the CA, the DH params and the server certificate
./easyrsa init-pki
./easyrsa --batch 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 $DH_KEY_SIZE
fi
./easyrsa build-server-full "$SERVER_NAME" nopass
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
case $TLS_SIG in
1)
# Generate tls-crypt key
openvpn --genkey --secret /etc/openvpn/tls-crypt.key
;;
2)
# Generate tls-auth key
openvpn --genkey --secret /etc/openvpn/tls-auth.key
;;
esac
# Move all the generated files
cp pki/ca.crt pki/private/ca.key "pki/issued/$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)
# Locate the proper resolv.conf
# Needed for systems running systemd-resolved
if grep -q "127.0.0.53" "/etc/resolv.conf"; then
RESOLVCONF='/run/systemd/resolve/resolv.conf'
else
RESOLVCONF='/etc/resolv.conf'
fi
# Obtain the resolvers from resolv.conf and use them for OpenVPN
grep -v '#' $RESOLVCONF | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read -r line; do
echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
done
;;
2)
echo 'push "dhcp-option DNS 10.8.0.1"' >> /etc/openvpn/server.conf
;;
3) # Cloudflare
echo 'push "dhcp-option DNS 1.0.0.1"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 1.1.1.1"' >> /etc/openvpn/server.conf
;;
4) # Quad9
echo 'push "dhcp-option DNS 9.9.9.9"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 149.112.112.112"' >> /etc/openvpn/server.conf
;;
5) # Quad9 uncensored
echo 'push "dhcp-option DNS 9.9.9.10"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 149.112.112.10"' >> /etc/openvpn/server.conf
;;
6) # FDN
echo 'push "dhcp-option DNS 80.67.169.40"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 80.67.169.12"' >> /etc/openvpn/server.conf
;;
7) # DNS.WATCH
echo 'push "dhcp-option DNS 84.200.69.80"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 84.200.70.40"' >> /etc/openvpn/server.conf
;;
8) # OpenDNS
echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
;;
9) # Google
echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
;;
10) # Yandex Basic
echo 'push "dhcp-option DNS 77.88.8.8"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 77.88.8.1"' >> /etc/openvpn/server.conf
;;
11) # AdGuard DNS
echo 'push "dhcp-option DNS 176.103.130.130"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
;;
esac
echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server.conf
# IPv6 network settings if needed
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
echo 'server-ipv6 fd42:42:42:42::/112
tun-ipv6
push tun-ipv6
push "route-ipv6 2000::/3"
push "redirect-gateway ipv6"' >> /etc/openvpn/server.conf
fi
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 0" >> /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 $CC_CIPHER
status /var/log/openvpn/status.log
verb 3" >> /etc/openvpn/server.conf
# Create log dir
mkdir -p /var/log/openvpn
# Enable routing
echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.d/20-openvpn.conf
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
echo 'net.ipv6.conf.all.forwarding=1' >> /etc/sysctl.d/20-openvpn.conf
fi
# Avoid an unneeded reboot
sysctl --system
# If SELinux is enabled and a custom port was selected, we need this
if hash sestatus 2>/dev/null; then
if sestatus | grep "Current mode" | grep -qs "enforcing"; then
if [[ "$PORT" != '1194' ]]; then
semanage port -a -t openvpn_port_t -p "$PROTOCOL" "$PORT"
fi
fi
fi
# Finally, restart and enable OpenVPN
if [[ "$OS" = 'arch' || "$OS" = 'fedora' ]]; then
# Don't modify package-provided service
cp /usr/lib/systemd/system/[email protected] /etc/systemd/system/[email protected]
# Workaround to fix OpenVPN service on OpenVZ
sed -i 's|LimitNPROC|#LimitNPROC|' /etc/systemd/system/[email protected]
# Another workaround to keep using /etc/openvpn/
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /etc/systemd/system/[email protected]
# On fedora, the service hardcodes the ciphers. We want to manage the cipher ourselves, so we remove it from the service
if [[ "$OS" == "fedora" ]];then
sed -i 's|--cipher AES-256-GCM --ncp-ciphers AES-256-GCM:AES-128-GCM:AES-256-CBC:AES-128-CBC:BF-CBC||' /etc/systemd/system/[email protected]
fi
systemctl daemon-reload
systemctl restart openvpn-server@server
systemctl enable 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 restart openvpn@server
systemctl enable openvpn@server
fi
if [[ $DNS == 2 ]];then
installUnbound
fi
# Add iptables rules in two scripts
mkdir /etc/iptables
# Script to add rules
echo "#!/bin/sh
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o $NIC -j MASQUERADE
iptables -A INPUT -i tun0 -j ACCEPT
iptables -A FORWARD -i $NIC -o tun0 -j ACCEPT
iptables -A FORWARD -i tun0 -o $NIC -j ACCEPT
iptables -A INPUT -i $NIC -p $PROTOCOL --dport $PORT -j ACCEPT" > /etc/iptables/add-openvpn-rules.sh
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
echo "ip6tables -t nat -A POSTROUTING -s fd42:42:42:42::/112 -o $NIC -j MASQUERADE
ip6tables -A INPUT -i tun0 -j ACCEPT
ip6tables -A FORWARD -i $NIC -o tun0 -j ACCEPT
ip6tables -A FORWARD -i tun0 -o $NIC -j ACCEPT" >> /etc/iptables/add-openvpn-rules.sh
fi
# Script to remove rules
echo "#!/bin/sh
iptables -t nat -D POSTROUTING -s 10.8.0.0/24 -o $NIC -j MASQUERADE
iptables -D INPUT -i tun0 -j ACCEPT
iptables -D FORWARD -i $NIC -o tun0 -j ACCEPT
iptables -D FORWARD -i tun0 -o $NIC -j ACCEPT
iptables -D INPUT -i $NIC -p $PROTOCOL --dport $PORT -j ACCEPT" > /etc/iptables/rm-openvpn-rules.sh
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
echo "ip6tables -t nat -D POSTROUTING -s fd42:42:42:42::/112 -o $NIC -j MASQUERADE
ip6tables -D INPUT -i tun0 -j ACCEPT
ip6tables -D FORWARD -i $NIC -o tun0 -j ACCEPT
ip6tables -D FORWARD -i tun0 -o $NIC -j ACCEPT" >> /etc/iptables/rm-openvpn-rules.sh
fi
chmod +x /etc/iptables/add-openvpn-rules.sh
chmod +x /etc/iptables/rm-openvpn-rules.sh
# Handle the rules via a systemd script
echo "[Unit]
Description=iptables rules for OpenVPN
Before=network-online.target
Wants=network-online.target
[Service]
Type=oneshot
ExecStart=/etc/iptables/add-openvpn-rules.sh
ExecStop=/etc/iptables/rm-openvpn-rules.sh
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target" > /etc/systemd/system/iptables-openvpn.service
# Enable service and apply rules
systemctl daemon-reload
systemctl enable iptables-openvpn
systemctl start iptables-openvpn
# If the server is behind a NAT, use the correct IP address for the clients to connect to
if [[ "$PUBLICIP" != "" ]]; then
IP=$PUBLICIP
fi
# client-template.txt is created so we have a template to add further users later
echo "client" > /etc/openvpn/client-template.txt
if [[ "$PROTOCOL" = 'udp' ]]; then
echo "proto udp" >> /etc/openvpn/client-template.txt
elif [[ "$PROTOCOL" = 'tcp' ]]; then
echo "proto tcp-client" >> /etc/openvpn/client-template.txt
fi
echo "remote $IP $PORT
dev tun
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
verify-x509-name $SERVER_NAME name
auth $HMAC_ALG
auth-nocache
cipher $CIPHER
tls-client
tls-version-min 1.2
tls-cipher $CC_CIPHER
setenv opt block-outside-dns # Prevent Windows 10 DNS leak
verb 3" >> /etc/openvpn/client-template.txt
if [[ $COMPRESSION_ENABLED == "y" ]]; then
echo "compress $COMPRESSION_ALG" >> /etc/openvpn/client-template.txt
fi
# Generate the custom client.ovpn
newClient
echo "If you want to add more clients, you simply need to run this script another time!"
}
function newClient () {
echo ""
echo "Tell me a name for the client."
echo "Use one word only, no special characters."
until [[ "$CLIENT" =~ ^[a-zA-Z0-9_]+$ ]]; do
read -rp "Client name: " -e CLIENT
done
echo ""
echo "Do you want to protect the configuration file with a password?"
echo "(e.g. encrypt the private key with a password)"
echo " 1) Add a passwordless client"
echo " 2) Use a password for the client"
until [[ "$PASS" =~ ^[1-2]$ ]]; do
read -rp "Select an option [1-2]: " -e -i 1 PASS
done
cd /etc/openvpn/easy-rsa/ || return
case $PASS in
1)
./easyrsa build-client-full "$CLIENT" nopass
;;
2)
echo "⚠️ You will be asked for the client password below ⚠️"
./easyrsa build-client-full "$CLIENT"
;;
esac
# Home directory of the user, where the client configuration (.ovpn) will be written
if [ -e "/home/$CLIENT" ]; then # if $1 is a user name
homeDir="/home/$CLIENT"
elif [ "${SUDO_USER}" ]; then # if not, use SUDO_USER
homeDir="/home/${SUDO_USER}"
else # if not SUDO_USER, use /root
homeDir="/root"
fi
# 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/' "/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