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README.md
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README.md
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## IPsec/L2TP VPN Auto Install Script for Ubuntu/Debian
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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 (Jessie).
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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.
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#### <a href="https://blog.ls20.com/ipsec-l2tp-vpn-auto-setup-for-ubuntu-12-04-on-amazon-ec2/" target="_blank">My VPN tutorial with detailed usage instructions</a>
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<a href="https://gist.github.com/hwdsl2/e9a78a50e300d12ae195" target="_blank">Alternative VPN script for CentOS/RHEL</a>
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<a href="https://gist.github.com/hwdsl2/5a769b2c4436cdf02a90" target="_blank">Workaround for Debian 7 (Wheezy)</a>
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<a href="http://www.sarfata.org/posts/setting-up-an-amazon-vpn-server.md" target="_blank">Original post by Thomas Sarlandie</a>
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↓ ↓ ↓ Scroll down for the script ↓ ↓ ↓
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### Copyright and license
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Copyright (C) 2014 Lin Song <a href="https://www.linkedin.com/in/linsongui" target="_blank"><img src="https://static.licdn.com/scds/common/u/img/webpromo/btn_profile_bluetxt_80x15.png" width="80" height="15" border="0" alt="View my profile on LinkedIn"></a>
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Based on the work of Thomas Sarlandie (Copyright 2012)
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This work is licensed under the <a href="http://creativecommons.org/licenses/by-sa/3.0/" target="_blank">Creative Commons Attribution-ShareAlike 3.0</a>
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Attribution required: please include my name in any derivative and let me know how you have improved it!
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<a href="https://github.com/igrigorik/ga-beacon" target="_blank"><img src="https://ga-bc1.appspot.com/UA-46742347-4/hwdsl2/9030462?dh=gist.github.com&gif=1" alt="Analytics" style="max-width:100%;"></a>
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vpnsetup.sh
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vpnsetup.sh
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#!/bin/sh
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#
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# Amazon EC2 user-data file for automatic configuration of IPsec/L2TP VPN server
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# on a Ubuntu or Debian instance. Tested with Ubuntu 14.04 & 12.04 and Debian 8 & 7.
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# on a Ubuntu or Debian instance. Tested with Ubuntu 14.04 & 12.04 and Debian 8.
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# With minor modifications, this script *can also be used* on dedicated servers
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# or any KVM- or XEN-based Virtual Private Server (VPS) from other providers.
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#
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# DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC! THIS IS MEANT TO BE RUN WHEN
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# YOUR AMAZON EC2 INSTANCE STARTS!
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#
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# For detailed instructions, please see:
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# https://blog.ls20.com/ipsec-l2tp-vpn-auto-setup-for-ubuntu-12-04-on-amazon-ec2/
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# CentOS/RHEL version: https://gist.github.com/hwdsl2/e9a78a50e300d12ae195
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# Original post by Thomas Sarlandie:
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# http://www.sarfata.org/posts/setting-up-an-amazon-vpn-server.md
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#
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# Copyright (C) 2014 Lin Song
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# Based on the work of Thomas Sarlandie (Copyright 2012)
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#
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@ -26,18 +20,17 @@
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if [ "$(uname)" = "Darwin" ]; then
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echo 'DO NOT run this script on your Mac! It should only be run on a newly-created EC2 instance'
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echo 'or other Dedicated Server / VPS, after you have modified it to set the variables below.'
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echo 'Please see detailed instructions at the URLs in the comments.'
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exit
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exit 1
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fi
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if [ "$(lsb_release -si)" != "Ubuntu" ] && [ "$(lsb_release -si)" != "Debian" ]; then
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echo "Looks like you aren't running this script on a Ubuntu or Debian system."
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exit
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exit 1
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fi
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if [ "$(id -u)" != 0 ]; then
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echo "Sorry, you need to run this script as root."
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exit
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exit 1
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fi
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# Please define your own values for those variables
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@ -45,57 +38,69 @@ IPSEC_PSK=your_very_secure_key
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VPN_USER=your_username
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VPN_PASSWORD=your_very_secure_password
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# IMPORTANT NOTES:
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# If you need multiple VPN users with different credentials,
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# please see: https://gist.github.com/hwdsl2/123b886f29f4c689f531
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# Important Notes:
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# For Windows users, a registry change is required to allow connections
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# to a VPN server behind NAT. Refer to section "Error 809" on this page:
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# https://kb.meraki.com/knowledge_base/troubleshooting-client-vpn
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# iPhone/iOS users may need to replace this line in ipsec.conf:
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# "rightprotoport=17/%any" with "rightprotoport=17/0".
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# For Windows users, a one-time registry change is required in order to
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# connect to a VPN server behind NAT (e.g. in Amazon EC2). Please see:
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# https://documentation.meraki.com/MX-Z/Client_VPN/Troubleshooting_Client_VPN#Windows_Error_809
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# If using Amazon EC2, these ports must be open in the security group of
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# your VPN server: UDP ports 500 & 4500, and TCP port 22 (optional, for SSH).
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# If your server uses a custom SSH port (not 22), or if you wish to allow other services
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# through IPTables, be sure to edit the IPTables rules below before running this script.
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# This script will backup /etc/rc.local, /etc/sysctl.conf and /etc/iptables.rules
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# before overwriting them. Backups can be found under the same folder with .old suffix.
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# iPhone/iOS users may need to replace this line in ipsec.conf:
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# "rightprotoport=17/%any" with "rightprotoport=17/0".
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# Update package index and install wget, dig (dnsutils) and nano
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export DEBIAN_FRONTEND=noninteractive
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apt-get -y update
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apt-get -y install wget dnsutils nano
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echo 'If the script hangs here, press Ctrl-C to interrupt, then edit it and comment out'
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echo 'the next two lines PUBLIC_IP= and PRIVATE_IP=, OR replace them with the actual IPs.'
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# In Amazon EC2, these two variables will be found automatically
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# In Amazon EC2, these two variables will be found automatically.
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# For all other servers, you may replace them with the actual IPs,
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# or comment out and let the script auto-detect in the next section
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# If your server only has a public IP, use that IP on both lines
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PUBLIC_IP=$(wget --retry-connrefused --tries=3 --timeout 15 -qO- 'http://169.254.169.254/latest/meta-data/public-ipv4')
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PRIVATE_IP=$(wget --retry-connrefused --tries=3 --timeout 15 -qO- 'http://169.254.169.254/latest/meta-data/local-ipv4')
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# or comment out and let the script auto-detect in the next section.
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# If your server only has a public IP, use that IP on both lines.
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PUBLIC_IP=$(wget --retry-connrefused -t 3 -T 15 -qO- 'http://169.254.169.254/latest/meta-data/public-ipv4')
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PRIVATE_IP=$(wget --retry-connrefused -t 3 -T 15 -qO- 'http://169.254.169.254/latest/meta-data/local-ipv4')
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# Attempt to find Public IP and Private IP automatically for non-EC2 servers
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# Attempt to find server IPs automatically for non-EC2 servers
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[ "$PUBLIC_IP" = "" ] && PUBLIC_IP=$(dig +short myip.opendns.com @resolver1.opendns.com)
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[ "$PUBLIC_IP" = "" ] && { echo "Could not find Public IP, please edit the script manually."; exit; }
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[ "$PUBLIC_IP" = "" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipecho.net/plain)
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[ "$PUBLIC_IP" = "" ] && { echo "Could not find Public IP, please edit the VPN script manually."; exit 1; }
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[ "$PRIVATE_IP" = "" ] && PRIVATE_IP=$(ifconfig eth0 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*')
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[ "$PRIVATE_IP" = "" ] && { echo "Could not find Private IP, please edit the script manually."; exit; }
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[ "$PRIVATE_IP" = "" ] && { echo "Could not find Private IP, please edit the VPN script manually."; exit 1; }
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# Install necessary packages
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apt-get -y install libnss3-dev libnspr4-dev pkg-config libpam0g-dev \
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libcap-ng-dev libcap-ng-utils libselinux1-dev \
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libcurl4-nss-dev libgmp3-dev flex bison gcc make \
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libunbound-dev libnss3-tools
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libunbound-dev libnss3-tools libevent-dev
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apt-get -y --no-install-recommends install xmlto
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apt-get -y install xl2tpd
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# Compile and install Libreswan (https://libreswan.org/)
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# To upgrade Libreswan when a newer version is available, just re-run these
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# eight commands with the new "SWAN_VER", and then restart services with
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# "service ipsec restart" and "service xl2tpd restart".
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# Create and change to working dir
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mkdir -p /opt/src
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cd /opt/src
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SWAN_VER=3.13
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cd /opt/src || { echo "Failed to change working directory to /opt/src. Aborting."; exit 1; }
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# Compile and install Libreswan (https://libreswan.org/)
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# To upgrade Libreswan when a newer version is available, just re-run
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# these commands with the new "SWAN_VER", and then restart services with
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# "service ipsec restart" and "service xl2tpd restart".
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SWAN_VER=3.16
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SWAN_URL=https://download.libreswan.org/libreswan-${SWAN_VER}.tar.gz
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wget --retry-connrefused --tries=3 --timeout 15 -qO- $SWAN_URL | tar xvz
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[ ! -d libreswan-${SWAN_VER} ] && { echo "Could not retrieve the Libreswan source file. Aborting."; exit; }
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wget -t 3 -T 30 -qO- $SWAN_URL | tar xvz
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[ ! -d libreswan-${SWAN_VER} ] && { echo "Could not retrieve Libreswan source files. Aborting."; exit 1; }
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cd libreswan-${SWAN_VER}
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make programs && make install
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@ -186,7 +191,7 @@ cat > /etc/ppp/chap-secrets <<EOF
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$VPN_USER l2tpd $VPN_PASSWORD *
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EOF
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/bin/cp -f /etc/sysctl.conf /etc/sysctl.conf.old-$(date +%Y-%m-%d-%H:%M:%S) 2>/dev/null
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/bin/cp -f /etc/sysctl.conf "/etc/sysctl.conf.old-$(date +%Y-%m-%d-%H:%M:%S)" 2>/dev/null
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cat > /etc/sysctl.conf <<EOF
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kernel.sysrq = 0
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kernel.core_uses_pid = 1
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@ -219,7 +224,7 @@ net.ipv4.tcp_rmem= 10240 87380 12582912
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net.ipv4.tcp_wmem= 10240 87380 12582912
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EOF
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/bin/cp -f /etc/iptables.rules /etc/iptables.rules.old-$(date +%Y-%m-%d-%H:%M:%S) 2>/dev/null
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/bin/cp -f /etc/iptables.rules "/etc/iptables.rules.old-$(date +%Y-%m-%d-%H:%M:%S)" 2>/dev/null
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cat > /etc/iptables.rules <<EOF
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*filter
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:INPUT ACCEPT [0:0]
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@ -239,6 +244,8 @@ cat > /etc/iptables.rules <<EOF
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-A FORWARD -m conntrack --ctstate INVALID -j DROP
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-A FORWARD -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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-A FORWARD -i ppp+ -o eth+ -j ACCEPT
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# If you wish to allow traffic between VPN clients themselves, uncomment this line:
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# -A FORWARD -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j ACCEPT
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-A FORWARD -j DROP
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-A ICMPALL -p icmp -f -j DROP
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-A ICMPALL -p icmp --icmp-type 0 -j ACCEPT
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@ -263,7 +270,7 @@ cat > /etc/network/if-pre-up.d/iptablesload <<EOF
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exit 0
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EOF
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/bin/cp -f /etc/rc.local /etc/rc.local.old-$(date +%Y-%m-%d-%H:%M:%S) 2>/dev/null
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/bin/cp -f /etc/rc.local "/etc/rc.local.old-$(date +%Y-%m-%d-%H:%M:%S)" 2>/dev/null
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cat > /etc/rc.local <<EOF
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#!/bin/sh -e
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#
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