#!/bin/sh # # Amazon EC2 user-data file for automatic configuration of IPsec/L2TP VPN server # on a Ubuntu or Debian instance. Tested with Ubuntu 14.04 & 12.04 and Debian 8. # With minor modifications, this script *can also be used* on dedicated servers # or any KVM- or XEN-based Virtual Private Server (VPS) from other providers. # # DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC! THIS IS MEANT TO BE RUN WHEN # YOUR AMAZON EC2 INSTANCE STARTS! # # Copyright (C) 2014 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! if [ "$(uname)" = "Darwin" ]; then echo 'DO NOT run this script on your Mac! It should only be run on a newly-created EC2 instance' echo 'or other Dedicated Server / VPS, after you have modified it to set the variables below.' exit 1 fi if [ "$(lsb_release -si)" != "Ubuntu" ] && [ "$(lsb_release -si)" != "Debian" ]; then echo "Looks like you aren't running this script on a Ubuntu or Debian system." exit 1 fi if [ "$(id -u)" != 0 ]; then echo "Sorry, you need to run this script as root." exit 1 fi # Please define your own values for those variables IPSEC_PSK=your_very_secure_key VPN_USER=your_username VPN_PASSWORD=your_very_secure_password # IMPORTANT NOTES: # For **Windows users**, a one-time registry change is required for connections # to a VPN server behind NAT (e.g. Amazon EC2). Please see: # https://documentation.meraki.com/MX-Z/Client_VPN/Troubleshooting_Client_VPN#Windows_Error_809 # **Android 6.0 users**: Edit /etc/ipsec.conf and append ",aes256-sha2_256" to the end of both # "ike=" and "phase2alg=", then add a new line "sha2-truncbug=yes". Start lines with two spaces. # When finished, run "service ipsec restart". Source: # https://libreswan.org/wiki/FAQ#Android_6.0_connection_comes_up_but_no_packet_flow # To support multiple VPN users with different credentials, see: # https://gist.github.com/hwdsl2/123b886f29f4c689f531 # Clients are configured to use Google Public DNS when the VPN connection is active. # This setting is controlled by "ms-dns" in /etc/ppp/options.xl2tpd. # https://developers.google.com/speed/public-dns/ # If using Amazon EC2, these ports must be open in the instance's security group: # UDP ports 500 & 4500 (for the VPN), and TCP port 22 (optional, for SSH). # If your server uses a custom SSH port (not 22), or if you wish to allow other services # through IPTables, be sure to edit the IPTables rules below before running this script. # This script will backup /etc/rc.local, /etc/sysctl.conf and /etc/iptables.rules # before overwriting them. Backups can be found under the same folder with .old suffix. # iPhone/iOS users: In case you're unable to connect, try replacing this line in /etc/ipsec.conf: # "rightprotoport=17/%any" with "rightprotoport=17/0". # Create and change to working dir mkdir -p /opt/src cd /opt/src || { echo "Failed to change working directory to /opt/src. Aborting."; exit 1; } # Update package index and install wget, dig (dnsutils) and nano export DEBIAN_FRONTEND=noninteractive apt-get -y update apt-get -y install wget dnsutils nano echo echo 'Please wait... Trying to find Public IP and Private IP of this server.' echo echo 'If the script hangs here for more than a few minutes, press Ctrl-C to interrupt,' echo 'then edit it and comment out the next two lines PUBLIC_IP= and PRIVATE_IP= ,' echo 'OR replace them with the actual IPs. If your server only has a public IP,' echo 'put that public IP on both lines.' echo # In Amazon EC2, these two variables will be found automatically. # For all other servers, you may replace them with the actual IPs, # or comment out and let the script auto-detect in the next section. # If your server only has a public IP, put that public 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') # Attempt to find server IPs automatically for non-EC2 servers [ "$PUBLIC_IP" = "" ] && PUBLIC_IP=$(dig +short myip.opendns.com @resolver1.opendns.com) [ "$PUBLIC_IP" = "" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipecho.net/plain) [ "$PUBLIC_IP" = "" ] && { echo "Could not find Public IP, please edit the VPN script manually."; exit 1; } [ "$PRIVATE_IP" = "" ] && PRIVATE_IP=$(ifconfig eth0 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*') [ "$PRIVATE_IP" = "" ] && { echo "Could not find Private IP, please edit the VPN script manually."; exit 1; } # Check public/private 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 -vEq "$IP_REGEX"; then echo "Could not find valid Public IP, please edit the VPN script manually." exit 1 fi if printf %s "$PRIVATE_IP" | grep -vEq "$IP_REGEX"; then echo "Could not find valid Private IP, please edit the VPN script manually." exit 1 fi # Install necessary packages apt-get -y install libnss3-dev libnspr4-dev pkg-config libpam0g-dev \ libcap-ng-dev libcap-ng-utils libselinux1-dev \ libcurl4-nss-dev libgmp3-dev flex bison gcc make \ libunbound-dev libnss3-tools libevent-dev apt-get -y --no-install-recommends install xmlto apt-get -y install xl2tpd # Install Fail2Ban to protect SSH server apt-get -y install fail2ban # Compile and install Libreswan (https://libreswan.org/) SWAN_VER=3.16 SWAN_FILE="libreswan-${SWAN_VER}.tar.gz" SWAN_URL="https://download.libreswan.org/${SWAN_FILE}" wget -t 3 -T 30 -nv -O "$SWAN_FILE" "$SWAN_URL" [ ! -f "$SWAN_FILE" ] && { echo "Could not retrieve Libreswan source file. Aborting."; exit 1; } /bin/rm -rf "/opt/src/libreswan-${SWAN_VER}" tar xvzf "$SWAN_FILE" && rm -f "$SWAN_FILE" cd "libreswan-${SWAN_VER}" || { echo "Failed to enter Libreswan source directory. Aborting."; exit 1; } make programs && make install # Prepare various config files cat > /etc/ipsec.conf < /etc/ipsec.secrets < /etc/xl2tpd/xl2tpd.conf < /etc/ppp/options.xl2tpd < /etc/ppp/chap-secrets </dev/null cat > /etc/sysctl.conf </dev/null cat > /etc/iptables.rules < /etc/network/if-pre-up.d/iptablesload </dev/null cat > /etc/rc.local < /proc/sys/net/ipv4/ip_forward exit 0 EOF if [ ! -f /etc/ipsec.d/cert8.db ] ; then echo > /var/tmp/libreswan-nss-pwd /usr/bin/certutil -N -f /var/tmp/libreswan-nss-pwd -d /etc/ipsec.d /bin/rm -f /var/tmp/libreswan-nss-pwd fi /sbin/sysctl -p /bin/chmod +x /etc/rc.local /bin/chmod +x /etc/network/if-pre-up.d/iptablesload /bin/chmod 600 /etc/ipsec.secrets /etc/ppp/chap-secrets /sbin/iptables-restore < /etc/iptables.rules /usr/sbin/service fail2ban stop >/dev/null 2>&1 /usr/sbin/service ipsec stop >/dev/null 2>&1 /usr/sbin/service xl2tpd stop >/dev/null 2>&1 /usr/sbin/service fail2ban start /usr/sbin/service ipsec start /usr/sbin/service xl2tpd start