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setup-ipsec-vpn/vpnsetup.sh
hwdsl2 737a7c7e6a
2014-12-29 20:31:27 -08:00

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#!/bin/sh
#
# Amazon EC2 user-data file for automatic configuration of IPsec/L2TP VPN
# on a Ubuntu server instance. Tested with 14.04 (Trusty) AND 12.04 (Precise).
# 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!
#
# For detailed instructions, please see:
# https://blog.ls20.com/ipsec-l2tp-vpn-auto-setup-for-ubuntu-12-04-on-amazon-ec2/
# Original post by Thomas Sarlandie:
# http://www.sarfata.org/posts/setting-up-an-amazon-vpn-server.md
#
# 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."
echo "Please see detailed instructions at the URLs in the comments."
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
# If you need multiple VPN users with different credentials,
# please see: https://gist.github.com/hwdsl2/123b886f29f4c689f531
# Important Notes:
# For Windows users, a registry change is required to allow connections
# to a VPN server behind NAT. Refer to section "Error 809" on this page:
# https://kb.meraki.com/knowledge_base/troubleshooting-client-vpn
# iPhone/iOS users may need to replace this line in ipsec.conf:
# "rightprotoport=17/%any" with "rightprotoport=17/0".
# If using Amazon EC2, these ports must be open in the security group
# of your VPN server: UDP ports 500 and 4500, and TCP port 22 (for SSH).
# In Amazon EC2, these two variables will be found automatically
# For all other servers, you MUST replace them with the actual IPs!
# If your server only has a public IP, use that IP on both lines
# Get public IP: wget -qO- http://ipecho.net/plain ; echo
# Get private IP: ifconfig eth0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'
PUBLIC_IP=$(wget -q -O - 'http://169.254.169.254/latest/meta-data/public-ipv4')
PRIVATE_IP=$(wget -q -O - 'http://169.254.169.254/latest/meta-data/local-ipv4')
# Install necessary packages
apt-get update
apt-get install libnss3-dev libnspr4-dev pkg-config libpam0g-dev \
libcap-ng-dev libcap-ng-utils libselinux1-dev \
libcurl4-nss-dev libgmp3-dev flex bison gcc make \
libunbound-dev libnss3-tools wget -y
apt-get install xl2tpd -y
# Compile and install Libreswan (https://libreswan.org/)
# To upgrade Libreswan when a newer version is available, just re-run these
# six commands with the new download link, and then restart services with
# "service ipsec restart" and "service xl2tpd restart".
mkdir -p /opt/src
cd /opt/src
wget -qO- https://download.libreswan.org/libreswan-3.12.tar.gz | tar xvz
cd libreswan-3.12
make programs
make install
# Prepare various config files
cat > /etc/ipsec.conf <<EOF
version 2.0
config setup
dumpdir=/var/run/pluto/
nat_traversal=yes
virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!192.168.42.0/24
oe=off
protostack=netkey
nhelpers=0
interfaces=%defaultroute
conn vpnpsk
connaddrfamily=ipv4
auto=add
left=$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)
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)
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
-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)
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
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