|
#!/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: |
|
|
|
# If you need multiple VPN users with different credentials, |
|
# please see: https://gist.github.com/hwdsl2/123b886f29f4c689f531 |
|
|
|
# For Windows users, a one-time registry change is required in order to |
|
# connect to a VPN server behind NAT (e.g. in Amazon EC2). Please see: |
|
# https://documentation.meraki.com/MX-Z/Client_VPN/Troubleshooting_Client_VPN#Windows_Error_809 |
|
|
|
# If using Amazon EC2, these ports must be open in the security group of |
|
# your VPN server: UDP ports 500 & 4500, 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 may need to replace this line in ipsec.conf: |
|
# "rightprotoport=17/%any" with "rightprotoport=17/0". |
|
|
|
# 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 'If the script hangs here, press Ctrl-C to interrupt, then edit it and comment out' |
|
echo 'the next two lines PUBLIC_IP= and PRIVATE_IP=, OR replace them with the actual IPs.' |
|
|
|
# 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, use 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') |
|
|
|
# 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; } |
|
|
|
# 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 |
|
|
|
# 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; } |
|
|
|
# Compile and install Libreswan (https://libreswan.org/) |
|
# To upgrade Libreswan when a newer version is available, just re-run |
|
# these commands with the new "SWAN_VER", and then restart services with |
|
# "service ipsec restart" and "service xl2tpd restart". |
|
SWAN_VER=3.16 |
|
SWAN_URL=https://download.libreswan.org/libreswan-${SWAN_VER}.tar.gz |
|
wget -t 3 -T 30 -qO- $SWAN_URL | tar xvz |
|
[ ! -d libreswan-${SWAN_VER} ] && { echo "Could not retrieve Libreswan source files. Aborting."; exit 1; } |
|
cd libreswan-${SWAN_VER} |
|
make programs && make install |
|
|
|
# Prepare various config files |
|
cat > /etc/ipsec.conf <<EOF |
|
version 2.0 |
|
|
|
config setup |
|
dumpdir=/var/run/pluto/ |
|
nat_traversal=yes |
|
virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!192.168.42.0/24 |
|
oe=off |
|
protostack=netkey |
|
nhelpers=0 |
|
interfaces=%defaultroute |
|
|
|
conn vpnpsk |
|
connaddrfamily=ipv4 |
|
auto=add |
|
left=$PRIVATE_IP |
|
leftid=$PUBLIC_IP |
|
leftsubnet=$PRIVATE_IP/32 |
|
leftnexthop=%defaultroute |
|
leftprotoport=17/1701 |
|
rightprotoport=17/%any |
|
right=%any |
|
rightsubnetwithin=0.0.0.0/0 |
|
forceencaps=yes |
|
authby=secret |
|
pfs=no |
|
type=transport |
|
auth=esp |
|
ike=3des-sha1,aes-sha1 |
|
phase2alg=3des-sha1,aes-sha1 |
|
rekey=no |
|
keyingtries=5 |
|
dpddelay=30 |
|
dpdtimeout=120 |
|
dpdaction=clear |
|
EOF |
|
|
|
cat > /etc/ipsec.secrets <<EOF |
|
$PUBLIC_IP %any : PSK "$IPSEC_PSK" |
|
EOF |
|
|
|
cat > /etc/xl2tpd/xl2tpd.conf <<EOF |
|
[global] |
|
port = 1701 |
|
|
|
;debug avp = yes |
|
;debug network = yes |
|
;debug state = yes |
|
;debug tunnel = yes |
|
|
|
[lns default] |
|
ip range = 192.168.42.10-192.168.42.250 |
|
local ip = 192.168.42.1 |
|
require chap = yes |
|
refuse pap = yes |
|
require authentication = yes |
|
name = l2tpd |
|
;ppp debug = yes |
|
pppoptfile = /etc/ppp/options.xl2tpd |
|
length bit = yes |
|
EOF |
|
|
|
cat > /etc/ppp/options.xl2tpd <<EOF |
|
ipcp-accept-local |
|
ipcp-accept-remote |
|
ms-dns 8.8.8.8 |
|
ms-dns 8.8.4.4 |
|
noccp |
|
auth |
|
crtscts |
|
idle 1800 |
|
mtu 1280 |
|
mru 1280 |
|
lock |
|
lcp-echo-failure 10 |
|
lcp-echo-interval 60 |
|
connect-delay 5000 |
|
EOF |
|
|
|
cat > /etc/ppp/chap-secrets <<EOF |
|
# Secrets for authentication using CHAP |
|
# client server secret IP addresses |
|
|
|
$VPN_USER l2tpd $VPN_PASSWORD * |
|
EOF |
|
|
|
/bin/cp -f /etc/sysctl.conf "/etc/sysctl.conf.old-$(date +%Y-%m-%d-%H:%M:%S)" 2>/dev/null |
|
cat > /etc/sysctl.conf <<EOF |
|
kernel.sysrq = 0 |
|
kernel.core_uses_pid = 1 |
|
net.ipv4.tcp_syncookies = 1 |
|
kernel.msgmnb = 65536 |
|
kernel.msgmax = 65536 |
|
kernel.shmmax = 68719476736 |
|
kernel.shmall = 4294967296 |
|
net.ipv4.ip_forward = 1 |
|
net.ipv4.conf.all.accept_source_route = 0 |
|
net.ipv4.conf.default.accept_source_route = 0 |
|
net.ipv4.conf.all.log_martians = 1 |
|
net.ipv4.conf.default.log_martians = 1 |
|
net.ipv4.conf.all.accept_redirects = 0 |
|
net.ipv4.conf.default.accept_redirects = 0 |
|
net.ipv4.conf.all.send_redirects = 0 |
|
net.ipv4.conf.default.send_redirects = 0 |
|
net.ipv4.conf.all.rp_filter = 0 |
|
net.ipv4.conf.default.rp_filter = 0 |
|
net.ipv6.conf.all.disable_ipv6=1 |
|
net.ipv6.conf.default.disable_ipv6=1 |
|
net.ipv4.icmp_echo_ignore_broadcasts = 1 |
|
net.ipv4.icmp_ignore_bogus_error_responses = 1 |
|
net.ipv4.conf.all.secure_redirects = 0 |
|
net.ipv4.conf.default.secure_redirects = 0 |
|
kernel.randomize_va_space = 1 |
|
net.core.wmem_max=12582912 |
|
net.core.rmem_max=12582912 |
|
net.ipv4.tcp_rmem= 10240 87380 12582912 |
|
net.ipv4.tcp_wmem= 10240 87380 12582912 |
|
EOF |
|
|
|
/bin/cp -f /etc/iptables.rules "/etc/iptables.rules.old-$(date +%Y-%m-%d-%H:%M:%S)" 2>/dev/null |
|
cat > /etc/iptables.rules <<EOF |
|
*filter |
|
:INPUT ACCEPT [0:0] |
|
:FORWARD ACCEPT [0:0] |
|
:OUTPUT ACCEPT [0:0] |
|
:ICMPALL - [0:0] |
|
-A INPUT -m conntrack --ctstate INVALID -j DROP |
|
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT |
|
-A INPUT -i lo -j ACCEPT |
|
-A INPUT -p icmp --icmp-type 255 -j ICMPALL |
|
-A INPUT -p udp --dport 67:68 --sport 67:68 -j ACCEPT |
|
-A INPUT -p tcp --dport 22 -j ACCEPT |
|
-A INPUT -p udp -m multiport --dports 500,4500 -j ACCEPT |
|
-A INPUT -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT |
|
-A INPUT -p udp --dport 1701 -j DROP |
|
-A INPUT -j DROP |
|
-A FORWARD -m conntrack --ctstate INVALID -j DROP |
|
-A FORWARD -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT |
|
-A FORWARD -i ppp+ -o eth+ -j ACCEPT |
|
# If you wish to allow traffic between VPN clients themselves, uncomment this line: |
|
# -A FORWARD -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j ACCEPT |
|
-A FORWARD -j DROP |
|
-A ICMPALL -p icmp -f -j DROP |
|
-A ICMPALL -p icmp --icmp-type 0 -j ACCEPT |
|
-A ICMPALL -p icmp --icmp-type 3 -j ACCEPT |
|
-A ICMPALL -p icmp --icmp-type 4 -j ACCEPT |
|
-A ICMPALL -p icmp --icmp-type 8 -j ACCEPT |
|
-A ICMPALL -p icmp --icmp-type 11 -j ACCEPT |
|
-A ICMPALL -p icmp -j DROP |
|
COMMIT |
|
*nat |
|
:PREROUTING ACCEPT [0:0] |
|
:INPUT ACCEPT [0:0] |
|
:OUTPUT ACCEPT [0:0] |
|
:POSTROUTING ACCEPT [0:0] |
|
-A POSTROUTING -s 192.168.42.0/24 -o eth+ -j SNAT --to-source ${PRIVATE_IP} |
|
COMMIT |
|
EOF |
|
|
|
cat > /etc/network/if-pre-up.d/iptablesload <<EOF |
|
#!/bin/sh |
|
/sbin/iptables-restore < /etc/iptables.rules |
|
exit 0 |
|
EOF |
|
|
|
/bin/cp -f /etc/rc.local "/etc/rc.local.old-$(date +%Y-%m-%d-%H:%M:%S)" 2>/dev/null |
|
cat > /etc/rc.local <<EOF |
|
#!/bin/sh -e |
|
# |
|
# rc.local |
|
# |
|
# This script is executed at the end of each multiuser runlevel. |
|
# Make sure that the script will "exit 0" on success or any other |
|
# value on error. |
|
# |
|
# In order to enable or disable this script just change the execution |
|
# bits. |
|
# |
|
# By default this script does nothing. |
|
/usr/sbin/service ipsec restart |
|
/usr/sbin/service xl2tpd restart |
|
echo 1 > /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/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 ipsec restart |
|
/usr/sbin/service xl2tpd restart |
