#!/bin/sh # # Script for automatic setup of an IPsec/L2TP VPN server on Ubuntu LTS and Debian 8. # Works on dedicated servers and any KVM- or Xen-based Virtual Private Server (VPS). # # DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC! THIS IS MEANT TO BE RUN # ON YOUR DEDICATED SERVER OR VPS! # # Copyright (C) 2014-2016 Lin Song # Based on the work of Thomas Sarlandie (Copyright 2012) # # This work is licensed under the Creative Commons Attribution-ShareAlike 3.0 # Unported License: http://creativecommons.org/licenses/by-sa/3.0/ # # Attribution required: please include my name in any derivative and let me # know how you have improved it! # ------------------------------------------------------------ # Define your own values for these variables # - All values MUST be quoted using 'single quotes' # - DO NOT use these characters inside values: \ " ' IPSEC_PSK='your_ipsec_pre_shared_key' VPN_USER='your_vpn_username' VPN_PASSWORD='your_very_secure_password' # Important Notes: https://git.io/vpnnotes # Setup VPN Clients: https://git.io/vpnclients # ------------------------------------------------------------ if [ "$(uname)" = "Darwin" ]; then echo 'DO NOT run this script on your Mac! It should only be used on a server.' exit 1 fi os_type="$(lsb_release -si 2>/dev/null)" if [ "$os_type" != "Ubuntu" ] && [ "$os_type" != "Debian" ]; then echo "This script only supports Ubuntu or Debian systems." exit 1 fi if [ -f /proc/user_beancounters ]; then echo "This script does NOT support OpenVZ VPS." echo "Try alternative: https://github.com/Nyr/openvpn-install" exit 1 fi if [ "$(id -u)" != 0 ]; then echo "Script must be run as root. Try 'sudo sh $0'" exit 1 fi if [ ! -f /sys/class/net/eth0/operstate ]; then echo "Network interface 'eth0' is not available. Aborting." exit 1 fi if [ -z "$IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then echo "VPN credentials cannot be empty. Edit the script and re-enter." exit 1 fi # Create and change to working dir mkdir -p /opt/src cd /opt/src || exit 1 # Update package index export DEBIAN_FRONTEND=noninteractive apt-get -y update # Make sure basic commands exist apt-get -y install wget dnsutils apt-get -y install iproute gawk grep sed net-tools echo echo 'Trying to find Public/Private IP of this server...' echo echo 'In case the script hangs here for more than a few minutes,' echo 'use Ctrl-C to interrupt. Then edit it and manually enter IPs.' echo # In Amazon EC2, these two variables will be retrieved from metadata. # For all other servers, replace them with actual IPs (or comment out). # If your server only has a public IP, put that IP on both lines. PUBLIC_IP=$(wget --retry-connrefused -t 3 -T 15 -qO- 'http://169.254.169.254/latest/meta-data/public-ipv4') PRIVATE_IP=$(wget --retry-connrefused -t 3 -T 15 -qO- 'http://169.254.169.254/latest/meta-data/local-ipv4') # Try to find IPs for non-EC2 servers [ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(dig +short myip.opendns.com @resolver1.opendns.com) [ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com) [ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipecho.net/plain) [ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ip -4 route get 1 | awk '{print $NF;exit}') [ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ifconfig eth0 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*') # Check IPs for correct format IP_REGEX="^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$" if ! printf %s "$PUBLIC_IP" | grep -Eq "$IP_REGEX"; then echo "Cannot find valid public IP. Edit the script and manually enter." exit 1 fi if ! printf %s "$PRIVATE_IP" | grep -Eq "$IP_REGEX"; then echo "Cannot find valid private IP. Edit the script and manually enter." exit 1 fi # Install necessary packages apt-get -y install libnss3-dev libnspr4-dev pkg-config libpam0g-dev \ libcap-ng-dev libcap-ng-utils libselinux1-dev \ libcurl4-nss-dev flex bison gcc make \ libunbound-dev libnss3-tools libevent-dev apt-get -y --no-install-recommends install xmlto apt-get -y install xl2tpd # Install Fail2Ban to protect SSH apt-get -y install fail2ban # Compile and install Libreswan SWAN_VER=3.17 SWAN_FILE="libreswan-${SWAN_VER}.tar.gz" SWAN_URL="https://download.libreswan.org/$SWAN_FILE" wget -t 3 -T 30 -nv -O "$SWAN_FILE" "$SWAN_URL" [ "$?" != "0" ] && { echo "Cannot download Libreswan source. Aborting."; exit 1; } /bin/rm -rf "/opt/src/libreswan-$SWAN_VER" tar xvzf "$SWAN_FILE" && /bin/rm -f "$SWAN_FILE" cd "libreswan-$SWAN_VER" || { echo "Cannot enter Libreswan source dir. Aborting."; exit 1; } # Workaround for Libreswan compile issues cat > Makefile.inc.local </dev/null | grep -qs "$SWAN_VER" [ "$?" != "0" ] && { echo; echo "Libreswan $SWAN_VER failed to build. Aborting."; exit 1; } # Prepare various config files # Create IPsec (Libreswan) config SYS_DT="$(date +%Y-%m-%d-%H:%M:%S)" /bin/cp -f /etc/ipsec.conf "/etc/ipsec.conf.old-$SYS_DT" 2>/dev/null cat > /etc/ipsec.conf </dev/null cat > /etc/ipsec.secrets </dev/null cat > /etc/xl2tpd/xl2tpd.conf </dev/null cat > /etc/ppp/options.xl2tpd </dev/null cat > /etc/ppp/chap-secrets </dev/null cat >> /etc/sysctl.conf </dev/null service fail2ban stop >/dev/null 2>&1 if [ "$(iptables-save | grep -c '^\-')" = "0" ]; then cat > /etc/iptables.rules < /etc/iptables.rules iptables-save >> /etc/iptables.rules fi # Update rules for iptables-persistent if [ -f /etc/iptables/rules.v4 ]; then /bin/cp -f /etc/iptables/rules.v4 "/etc/iptables/rules.v4.old-$SYS_DT" /bin/cp -f /etc/iptables.rules /etc/iptables/rules.v4 fi fi # Create basic IP6Tables (IPv6) rules if ! grep -qs "hwdsl2 VPN script" /etc/ip6tables.rules; then /bin/cp -f /etc/ip6tables.rules "/etc/ip6tables.rules.old-$SYS_DT" 2>/dev/null cat > /etc/ip6tables.rules < /etc/network/if-pre-up.d/iptablesload < /etc/network/if-pre-up.d/ip6tablesload </dev/null sed --follow-symlinks -i -e '/^exit 0/d' /etc/rc.local cat >> /etc/rc.local < /proc/sys/net/ipv4/ip_forward exit 0 EOF fi # Initialize Libreswan DB if [ ! -f /etc/ipsec.d/cert8.db ] ; then echo > /var/tmp/libreswan-nss-pwd certutil -N -f /var/tmp/libreswan-nss-pwd -d /etc/ipsec.d /bin/rm -f /var/tmp/libreswan-nss-pwd fi # Reload sysctl.conf sysctl -p # Update file attributes chmod +x /etc/rc.local chmod +x /etc/network/if-pre-up.d/iptablesload chmod +x /etc/network/if-pre-up.d/ip6tablesload chmod 600 /etc/ipsec.secrets* /etc/ppp/chap-secrets* # Apply new IPTables rules iptables-restore < /etc/iptables.rules ip6tables-restore < /etc/ip6tables.rules >/dev/null 2>&1 # Restart services service fail2ban stop >/dev/null 2>&1 service ipsec stop >/dev/null 2>&1 service xl2tpd stop >/dev/null 2>&1 service fail2ban start service ipsec start service xl2tpd start echo echo '=============================================' echo 'IPsec/L2TP VPN server setup is complete!' echo echo 'Connect to your new VPN with these details:' echo echo "Server IP: $PUBLIC_IP" echo "IPsec PSK: $IPSEC_PSK" echo "Username: $VPN_USER" echo "Password: $VPN_PASSWORD" echo '=============================================' echo echo 'Important Notes: https://git.io/vpnnotes' echo 'Setup VPN Clients: https://git.io/vpnclients' echo exit 0