416 lines
14 KiB
Bash
416 lines
14 KiB
Bash
#!/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.
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# Besides EC2, this script *can also be used* on dedicated servers or any KVM-
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# 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
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# ON YOUR DEDICATED SERVER OR VPS!
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#
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# Copyright (C) 2014-2016 Lin Song
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# Based on the work of Thomas Sarlandie (Copyright 2012)
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#
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# This work is licensed under the Creative Commons Attribution-ShareAlike 3.0
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# Unported License: http://creativecommons.org/licenses/by-sa/3.0/
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#
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# Attribution required: please include my name in any derivative and let me
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# know how you have improved it!
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# ------------------------------------------------------------
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# Please define your own values for these variables
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# - All values MUST be quoted using 'single quotes'
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# - DO NOT use these characters inside values: \ " '
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IPSEC_PSK='your_ipsec_pre_shared_key'
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VPN_USER='your_vpn_username'
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VPN_PASSWORD='your_very_secure_password'
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# Be sure to read *important notes* at the URL below:
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# https://github.com/hwdsl2/setup-ipsec-vpn#important-notes
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# ------------------------------------------------------------
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if [ "$(uname)" = "Darwin" ]; then
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echo 'DO NOT run this script on your Mac! It should only be run on a newly-created EC2 instance'
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echo 'or other dedicated server / VPS, after you have modified it to set the variables above.'
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exit 1
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fi
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if [ "$(lsb_release -si 2>/dev/null)" != "Ubuntu" ] && [ "$(lsb_release -si 2>/dev/null)" != "Debian" ]; then
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echo "Looks like you aren't running this script on a Ubuntu or Debian system."
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exit 1
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fi
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if [ -f "/proc/user_beancounters" ]; then
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echo "This script does NOT support OpenVZ VPS."
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echo "Try Nyr's OpenVPN script: https://github.com/Nyr/openvpn-install"
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exit 1
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fi
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if [ "$(id -u)" != 0 ]; then
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echo "Sorry, you need to run this script as root."
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exit 1
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fi
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if [ ! -f /sys/class/net/eth0/operstate ]; then
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echo "Network interface 'eth0' is not available. Aborting."
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exit 1
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fi
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if [ -z "$IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
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echo "VPN credentials cannot be empty, please edit the VPN script."
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exit 1
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fi
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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 || { echo "Failed to change working directory to /opt/src. Aborting."; exit 1; }
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# Update package index and install Wget and dig (dnsutils)
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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
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echo
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echo 'Please wait... Trying to find Public/Private IP of this server.'
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echo
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echo 'If the script hangs here for more than a few minutes, press Ctrl-C to interrupt,'
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echo 'then edit and comment out the next two lines PUBLIC_IP= and PRIVATE_IP=, or replace'
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echo 'them with actual IPs. If your server only has a public IP, put it on both lines.'
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echo
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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, put it 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=$(wget --retry-connrefused -t 3 -T 15 -qO- 'http://169.254.169.254/latest/meta-data/local-ipv4')
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# Attempt to find server IPs for non-EC2 servers
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[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(dig +short myip.opendns.com @resolver1.opendns.com)
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[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
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[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipecho.net/plain)
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[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ip -4 route get 1 | awk '{print $NF;exit}')
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[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ifconfig eth0 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*')
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# Check IPs for correct format
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IP_REGEX="^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
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if ! printf %s "$PUBLIC_IP" | grep -Eq "$IP_REGEX"; then
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echo "Cannot find valid Public IP, please edit the VPN script manually."
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exit 1
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fi
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if ! printf %s "$PRIVATE_IP" | grep -Eq "$IP_REGEX"; then
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echo "Cannot find valid Private IP, please edit the VPN script manually."
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exit 1
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fi
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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 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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# Install Fail2Ban to protect SSH server
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apt-get -y install fail2ban
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# Compile and install Libreswan
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SWAN_VER=3.16
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SWAN_FILE="libreswan-${SWAN_VER}.tar.gz"
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SWAN_URL="https://download.libreswan.org/${SWAN_FILE}"
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wget -t 3 -T 30 -nv -O "$SWAN_FILE" "$SWAN_URL"
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[ ! -f "$SWAN_FILE" ] && { echo "Cannot retrieve Libreswan source file. Aborting."; exit 1; }
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/bin/rm -rf "/opt/src/libreswan-${SWAN_VER}"
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tar xvzf "$SWAN_FILE" && rm -f "$SWAN_FILE"
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cd "libreswan-${SWAN_VER}" || { echo "Failed to enter Libreswan source dir. Aborting."; exit 1; }
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make programs && make install
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# Check if the install was successful
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/usr/local/sbin/ipsec --version 2>/dev/null | grep -qs "${SWAN_VER}"
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[ "$?" != "0" ] && { echo "Sorry, Libreswan ${SWAN_VER} failed to compile or install. Aborting."; exit 1; }
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# Prepare various config files
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# Create IPsec (Libreswan) configuration
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SYS_DT="$(/bin/date +%Y-%m-%d-%H:%M:%S)"
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/bin/cp -f /etc/ipsec.conf "/etc/ipsec.conf.old-${SYS_DT}" 2>/dev/null
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cat > /etc/ipsec.conf <<EOF
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version 2.0
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config setup
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dumpdir=/var/run/pluto/
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nat_traversal=yes
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virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!192.168.42.0/24
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oe=off
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protostack=netkey
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nhelpers=0
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interfaces=%defaultroute
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conn vpnpsk
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connaddrfamily=ipv4
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auto=add
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left=$PRIVATE_IP
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leftid=$PUBLIC_IP
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leftsubnet=$PRIVATE_IP/32
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leftnexthop=%defaultroute
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leftprotoport=17/1701
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rightprotoport=17/%any
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right=%any
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rightsubnetwithin=0.0.0.0/0
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forceencaps=yes
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authby=secret
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pfs=no
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type=transport
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auth=esp
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ike=3des-sha1,aes-sha1
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phase2alg=3des-sha1,aes-sha1
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rekey=no
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keyingtries=5
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dpddelay=30
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dpdtimeout=120
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dpdaction=clear
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EOF
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# Specify IPsec PSK
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/bin/cp -f /etc/ipsec.secrets "/etc/ipsec.secrets.old-${SYS_DT}" 2>/dev/null
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cat > /etc/ipsec.secrets <<EOF
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$PUBLIC_IP %any : PSK "$IPSEC_PSK"
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EOF
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# Create xl2tpd config
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/bin/cp -f /etc/xl2tpd/xl2tpd.conf "/etc/xl2tpd/xl2tpd.conf.old-${SYS_DT}" 2>/dev/null
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cat > /etc/xl2tpd/xl2tpd.conf <<EOF
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[global]
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port = 1701
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;debug avp = yes
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;debug network = yes
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;debug state = yes
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;debug tunnel = yes
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[lns default]
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ip range = 192.168.42.10-192.168.42.250
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local ip = 192.168.42.1
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require chap = yes
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refuse pap = yes
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require authentication = yes
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name = l2tpd
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;ppp debug = yes
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pppoptfile = /etc/ppp/options.xl2tpd
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length bit = yes
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EOF
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# Specify xl2tpd options
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/bin/cp -f /etc/ppp/options.xl2tpd "/etc/ppp/options.xl2tpd.old-${SYS_DT}" 2>/dev/null
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cat > /etc/ppp/options.xl2tpd <<EOF
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ipcp-accept-local
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ipcp-accept-remote
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ms-dns 8.8.8.8
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ms-dns 8.8.4.4
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noccp
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auth
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crtscts
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idle 1800
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mtu 1280
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mru 1280
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lock
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lcp-echo-failure 10
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lcp-echo-interval 60
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connect-delay 5000
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EOF
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# Create VPN credentials
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/bin/cp -f /etc/ppp/chap-secrets "/etc/ppp/chap-secrets.old-${SYS_DT}" 2>/dev/null
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cat > /etc/ppp/chap-secrets <<EOF
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# Secrets for authentication using CHAP
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# client server secret IP addresses
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"$VPN_USER" l2tpd "$VPN_PASSWORD" *
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EOF
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# Update sysctl settings for VPN and performance
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if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
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/bin/cp -f /etc/sysctl.conf "/etc/sysctl.conf.old-${SYS_DT}" 2>/dev/null
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cat >> /etc/sysctl.conf <<EOF
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# Added by hwdsl2 VPN script
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kernel.msgmnb = 65536
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kernel.msgmax = 65536
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kernel.shmmax = 68719476736
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kernel.shmall = 4294967296
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net.ipv4.ip_forward = 1
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net.ipv4.tcp_syncookies = 1
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net.ipv4.conf.all.accept_source_route = 0
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net.ipv4.conf.default.accept_source_route = 0
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net.ipv4.conf.all.accept_redirects = 0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv4.conf.all.send_redirects = 0
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net.ipv4.conf.default.send_redirects = 0
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net.ipv4.conf.lo.send_redirects = 0
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net.ipv4.conf.eth0.send_redirects = 0
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net.ipv4.conf.all.rp_filter = 0
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net.ipv4.conf.default.rp_filter = 0
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net.ipv4.conf.lo.rp_filter = 0
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net.ipv4.conf.eth0.rp_filter = 0
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net.ipv4.icmp_echo_ignore_broadcasts = 1
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net.ipv4.icmp_ignore_bogus_error_responses = 1
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net.core.wmem_max = 12582912
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net.core.rmem_max = 12582912
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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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fi
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# Create basic IPTables rules. First check if there are existing IPTables rules loaded.
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# 1. If IPTables is "empty", write out the new set of rules below.
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# 2. If *not* empty, insert new rules and save them together with existing ones.
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if ! grep -qs "hwdsl2 VPN script" /etc/iptables.rules; then
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/bin/cp -f /etc/iptables.rules "/etc/iptables.rules.old-${SYS_DT}" 2>/dev/null
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/usr/sbin/service fail2ban stop >/dev/null 2>&1
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if [ "$(/sbin/iptables-save | grep -c '^\-')" = "0" ]; then
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cat > /etc/iptables.rules <<EOF
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# Added by hwdsl2 VPN script
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*filter
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:INPUT ACCEPT [0:0]
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:FORWARD ACCEPT [0:0]
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:OUTPUT ACCEPT [0:0]
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:ICMPALL - [0:0]
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-A INPUT -m conntrack --ctstate INVALID -j DROP
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-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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-A INPUT -i lo -j ACCEPT
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-A INPUT -d 127.0.0.0/8 -j REJECT
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-A INPUT -p icmp --icmp-type 255 -j ICMPALL
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-A INPUT -p udp --dport 67:68 --sport 67:68 -j ACCEPT
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-A INPUT -p tcp --dport 22 -j ACCEPT
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-A INPUT -p udp -m multiport --dports 500,4500 -j ACCEPT
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-A INPUT -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
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-A INPUT -p udp --dport 1701 -j DROP
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-A INPUT -j DROP
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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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-A ICMPALL -p icmp --icmp-type 3 -j ACCEPT
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-A ICMPALL -p icmp --icmp-type 4 -j ACCEPT
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-A ICMPALL -p icmp --icmp-type 8 -j ACCEPT
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-A ICMPALL -p icmp --icmp-type 11 -j ACCEPT
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-A ICMPALL -p icmp -j DROP
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COMMIT
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*nat
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:PREROUTING ACCEPT [0:0]
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:INPUT ACCEPT [0:0]
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:OUTPUT ACCEPT [0:0]
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:POSTROUTING ACCEPT [0:0]
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-A POSTROUTING -s 192.168.42.0/24 -o eth+ -j SNAT --to-source "${PRIVATE_IP}"
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COMMIT
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EOF
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else
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iptables -I INPUT 1 -p udp -m multiport --dports 500,4500 -j ACCEPT
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iptables -I INPUT 2 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
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iptables -I INPUT 3 -p udp --dport 1701 -j DROP
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iptables -I FORWARD 1 -m conntrack --ctstate INVALID -j DROP
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iptables -I FORWARD 2 -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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iptables -I FORWARD 3 -i ppp+ -o eth+ -j ACCEPT
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# iptables -I FORWARD 4 -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j ACCEPT
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iptables -A FORWARD -j DROP
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iptables -t nat -I POSTROUTING -s 192.168.42.0/24 -o eth+ -j SNAT --to-source "${PRIVATE_IP}"
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echo "# Modified by hwdsl2 VPN script" > /etc/iptables.rules
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/sbin/iptables-save >> /etc/iptables.rules
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fi
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# Update rules for iptables-persistent
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if [ -f /etc/iptables/rules.v4 ]; then
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/bin/cp -f /etc/iptables/rules.v4 "/etc/iptables/rules.v4.old-${SYS_DT}"
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/bin/cp -f /etc/iptables.rules /etc/iptables/rules.v4
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fi
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fi
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# Create basic IP6Tables (IPv6) rules
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if ! grep -qs "hwdsl2 VPN script" /etc/ip6tables.rules; then
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/bin/cp -f /etc/ip6tables.rules "/etc/ip6tables.rules.old-${SYS_DT}" 2>/dev/null
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cat > /etc/ip6tables.rules <<EOF
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# Added by hwdsl2 VPN script
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*filter
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:INPUT ACCEPT [0:0]
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:FORWARD DROP [0:0]
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:OUTPUT ACCEPT [0:0]
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-A INPUT -i lo -j ACCEPT
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-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
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-A INPUT -m rt --rt-type 0 -j DROP
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-A INPUT -s fe80::/10 -j ACCEPT
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-A INPUT -p ipv6-icmp -j ACCEPT
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-A INPUT -j DROP
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COMMIT
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EOF
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# Update rules (IPv6) for iptables-persistent
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if [ -f /etc/iptables/rules.v6 ]; then
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/bin/cp -f /etc/iptables/rules.v6 "/etc/iptables/rules.v6.old-${SYS_DT}"
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/bin/cp -f /etc/ip6tables.rules /etc/iptables/rules.v6
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fi
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fi
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# Load IPTables rules at system boot
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cat > /etc/network/if-pre-up.d/iptablesload <<EOF
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#!/bin/sh
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/sbin/iptables-restore < /etc/iptables.rules
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exit 0
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EOF
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cat > /etc/network/if-pre-up.d/ip6tablesload <<EOF
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#!/bin/sh
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/sbin/ip6tables-restore < /etc/ip6tables.rules
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exit 0
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EOF
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# Update rc.local to start services at boot
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if ! grep -qs "hwdsl2 VPN script" /etc/rc.local; then
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/bin/cp -f /etc/rc.local "/etc/rc.local.old-${SYS_DT}" 2>/dev/null
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/bin/sed --follow-symlinks -i -e '/^exit 0/d' /etc/rc.local
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cat >> /etc/rc.local <<EOF
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# Added by hwdsl2 VPN script
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/usr/sbin/service fail2ban restart || /bin/true
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/usr/sbin/service ipsec start
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/usr/sbin/service xl2tpd start
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echo 1 > /proc/sys/net/ipv4/ip_forward
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exit 0
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EOF
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fi
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# Initialize Libreswan DB
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if [ ! -f /etc/ipsec.d/cert8.db ] ; then
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echo > /var/tmp/libreswan-nss-pwd
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/usr/bin/certutil -N -f /var/tmp/libreswan-nss-pwd -d /etc/ipsec.d
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/bin/rm -f /var/tmp/libreswan-nss-pwd
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fi
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# Reload sysctl.conf
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/sbin/sysctl -p
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# Update file attributes
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/bin/chmod +x /etc/rc.local
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/bin/chmod +x /etc/network/if-pre-up.d/iptablesload
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/bin/chmod +x /etc/network/if-pre-up.d/ip6tablesload
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/bin/chmod 600 /etc/ipsec.secrets* /etc/ppp/chap-secrets*
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# Apply new IPTables rules
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/sbin/iptables-restore < /etc/iptables.rules
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/sbin/ip6tables-restore < /etc/ip6tables.rules
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# Restart services
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/usr/sbin/service fail2ban stop >/dev/null 2>&1
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/usr/sbin/service ipsec stop >/dev/null 2>&1
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/usr/sbin/service xl2tpd stop >/dev/null 2>&1
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/usr/sbin/service fail2ban start
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/usr/sbin/service ipsec start
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/usr/sbin/service xl2tpd start
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