This commit is contained in:
hwdsl2
commit
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#!/bin/sh
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#
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# Amazon EC2 user-data file for automatic configuration of a VPN
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# on a Ubuntu server instance. Tested with 12.04.
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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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# Copyright (C) 2014 Lin Song. Based on the work of Thomas Sarlandie (Copyright 2012)
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# For detailed instructions, see my tech blog article:
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#
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# Also see: http://www.sarfata.org/posts/setting-up-an-amazon-vpn-server.md
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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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# Please define your own values for those variables
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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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# Install necessary packages
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apt-get update
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apt-get 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 -y
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apt-get install xl2tpd -y
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# Compile and install Libreswan
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mkdir -p /opt/src
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cd /opt/src
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wget -qO- https://download.libreswan.org/libreswan-3.8.tar.gz | tar xvz
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cd libreswan-3.8
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make programs
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make install
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# Those two variables will be found automatically
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PRIVATE_IP=`wget -q -O - 'http://169.254.169.254/latest/meta-data/local-ipv4'`
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PUBLIC_IP=`wget -q -O - 'http://169.254.169.254/latest/meta-data/public-ipv4'`
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# Prepare various config files
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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=$PRIVATE_IP/32
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leftnexthop=%defaultroute
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leftprotoport=17/1701
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rightprotoport=17/%any
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right=%any
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rightsubnetwithin=0.0.0.0/0
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forceencaps=yes
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authby=secret
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pfs=no
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type=transport
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auth=esp
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ike=3des-sha1,aes-sha1
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phase2alg=3des-sha1,aes-sha1
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rekey=no
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keyingtries=5
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dpddelay=30
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dpdtimeout=120
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dpdaction=clear
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EOF
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cat > /etc/ipsec.secrets <<EOF
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$PUBLIC_IP %any : PSK "$IPSEC_PSK"
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EOF
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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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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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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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/bin/cp -f /etc/sysctl.conf /etc/sysctl.conf.old
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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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net.ipv4.tcp_syncookies = 1
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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.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.log_martians = 1
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net.ipv4.conf.default.log_martians = 1
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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.all.rp_filter = 0
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net.ipv4.conf.default.rp_filter = 0
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net.ipv6.conf.all.disable_ipv6=1
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net.ipv6.conf.default.disable_ipv6=1
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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.ipv4.conf.all.secure_redirects = 0
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net.ipv4.conf.default.secure_redirects = 0
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kernel.randomize_va_space = 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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cat > /etc/iptables.rules <<EOF
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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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:ZREJ - [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 -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 ZREJ
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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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-A FORWARD -j ZREJ
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-A ICMPALL -p icmp --fragment -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 -j DROP
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-A ZREJ -p tcp -j REJECT --reject-with tcp-reset
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-A ZREJ -p udp -j REJECT --reject-with icmp-port-unreachable
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-A ZREJ -j REJECT --reject-with icmp-proto-unreachable
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COMMIT
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*mangle
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:PREROUTING ACCEPT [0:0]
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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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:POSTROUTING ACCEPT [0:0]
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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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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/rc.local <<EOF
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#!/bin/sh -e
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#
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# rc.local
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#
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# This script is executed at the end of each multiuser runlevel.
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# Make sure that the script will "exit 0" on success or any other
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# value on error.
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#
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# In order to enable or disable this script just change the execution
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# bits.
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#
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# By default this script does nothing.
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/usr/sbin/service ipsec restart
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/usr/sbin/service xl2tpd restart
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exit 0
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EOF
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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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/sbin/sysctl -p
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/bin/chmod +x /etc/network/if-pre-up.d/iptablesload
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/sbin/iptables-restore < /etc/iptables.rules
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/usr/sbin/service ipsec restart
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/usr/sbin/service xl2tpd restart
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