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- #!/bin/sh
- #
- # Script for automatic configuration of IPsec/L2TP VPN server on Ubuntu 14.04/12.04 and Debian 8.
- # Works on dedicated servers and any KVM- or Xen-based Virtual Private Server (VPS).
- # It can also be used as Amazon EC2 "user-data" with the official Ubuntu or Debian AMIs.
- #
- # DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC! THIS IS MEANT TO BE RUN
- # ON YOUR DEDICATED SERVER OR VPS!
- #
- # Copyright (C) 2014-2016 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!
- # ------------------------------------------------------------
- # Please define your own values for these variables
- # - All values MUST be quoted using 'single quotes'
- # - DO NOT use these characters inside values: \ " '
- IPSEC_PSK='your_ipsec_pre_shared_key'
- VPN_USER='your_vpn_username'
- VPN_PASSWORD='your_very_secure_password'
- # Be sure to read *important notes* at the URL below:
- # https://github.com/hwdsl2/setup-ipsec-vpn#important-notes
- # ------------------------------------------------------------
- if [ "$(uname)" = "Darwin" ]; then
- echo 'DO NOT run this script on your Mac! It should only be run on a dedicated server / VPS'
- echo 'or a newly-created EC2 instance, after you have modified it to set the variables above.'
- exit 1
- fi
- if [ "$(lsb_release -si 2>/dev/null)" != "Ubuntu" ] && [ "$(lsb_release -si 2>/dev/null)" != "Debian" ]; then
- echo "Looks like you aren't running this script on a Ubuntu or Debian system."
- exit 1
- fi
- if [ -f /proc/user_beancounters ]; then
- echo "This script does NOT support OpenVZ VPS."
- echo "Try Nyr's OpenVPN script: https://github.com/Nyr/openvpn-install"
- exit 1
- fi
- if [ "$(id -u)" != 0 ]; then
- echo "Sorry, you need to run this script as root."
- exit 1
- fi
- if [ ! -f /sys/class/net/eth0/operstate ]; then
- echo "Network interface 'eth0' is not available. Aborting."
- exit 1
- fi
- if [ -z "$IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
- echo "VPN credentials cannot be empty. Edit the script and re-enter."
- exit 1
- fi
- # Create and change to working dir
- mkdir -p /opt/src
- cd /opt/src || { echo "Failed to change working dir to /opt/src. Aborting."; exit 1; }
- # Update package index and install Wget and dig (dnsutils)
- export DEBIAN_FRONTEND=noninteractive
- apt-get -y update
- apt-get -y install wget dnsutils
- echo
- echo 'Trying to determine Public/Private IP of this server...'
- echo
- echo 'In case the script hangs here for more than a few minutes, press Ctrl-C to interrupt.'
- echo 'Then edit the script and follow instructions to manually enter server IPs.'
- echo
- # In Amazon EC2, these two variables will be retrieved from metadata.
- # For all other servers, you may replace them with actual IPs,
- # or comment them out to use auto-detection in the next section.
- # If your server only has a public IP, put that IP on both lines.
- PUBLIC_IP=$(wget --retry-connrefused -t 3 -T 15 -qO- 'http://169.254.169.254/latest/meta-data/public-ipv4')
- PRIVATE_IP=$(wget --retry-connrefused -t 3 -T 15 -qO- 'http://169.254.169.254/latest/meta-data/local-ipv4')
- # Try to determine IPs for non-EC2 servers
- [ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(dig +short myip.opendns.com @resolver1.opendns.com)
- [ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
- [ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipecho.net/plain)
- [ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ip -4 route get 1 | awk '{print $NF;exit}')
- [ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ifconfig eth0 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*')
- # Check IPs for correct format
- IP_REGEX="^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
- if ! printf %s "$PUBLIC_IP" | grep -Eq "$IP_REGEX"; then
- echo "Cannot find valid public IP, please edit the script and manually enter."
- exit 1
- fi
- if ! printf %s "$PRIVATE_IP" | grep -Eq "$IP_REGEX"; then
- echo "Cannot find valid private IP, please edit the script and manually enter."
- exit 1
- fi
- # 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
- # Install Fail2Ban to protect SSH
- apt-get -y install fail2ban
- # Compile and install Libreswan
- SWAN_VER=3.16
- SWAN_FILE="libreswan-${SWAN_VER}.tar.gz"
- SWAN_URL="https://download.libreswan.org/$SWAN_FILE"
- wget -t 3 -T 30 -nv -O "$SWAN_FILE" "$SWAN_URL"
- [ ! -f "$SWAN_FILE" ] && { echo "Cannot retrieve Libreswan source file. Aborting."; exit 1; }
- /bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
- tar xvzf "$SWAN_FILE" && rm -f "$SWAN_FILE"
- cd "libreswan-$SWAN_VER" || { echo "Failed to enter Libreswan source dir. Aborting."; exit 1; }
- make programs && make install
- # Check if Libreswan install was successful
- /usr/local/sbin/ipsec --version 2>/dev/null | grep -qs "$SWAN_VER"
- [ "$?" != "0" ] && { echo "Sorry, Libreswan $SWAN_VER failed to build. Aborting."; exit 1; }
- # Prepare various config files
- # Create IPsec (Libreswan) config
- SYS_DT="$(/bin/date +%Y-%m-%d-%H:%M:%S)"
- /bin/cp -f /etc/ipsec.conf "/etc/ipsec.conf.old-$SYS_DT" 2>/dev/null
- cat > /etc/ipsec.conf <<EOF
- version 2.0
- config setup
- dumpdir=/var/run/pluto/
- nat_traversal=yes
- virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!192.168.42.0/24
- oe=off
- protostack=netkey
- nhelpers=0
- interfaces=%defaultroute
- conn vpnpsk
- connaddrfamily=ipv4
- auto=add
- left=$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
- # Specify IPsec PSK
- /bin/cp -f /etc/ipsec.secrets "/etc/ipsec.secrets.old-$SYS_DT" 2>/dev/null
- cat > /etc/ipsec.secrets <<EOF
- $PUBLIC_IP %any : PSK "$IPSEC_PSK"
- EOF
- # Create xl2tpd config
- /bin/cp -f /etc/xl2tpd/xl2tpd.conf "/etc/xl2tpd/xl2tpd.conf.old-$SYS_DT" 2>/dev/null
- cat > /etc/xl2tpd/xl2tpd.conf <<EOF
- [global]
- port = 1701
- ;debug avp = yes
- ;debug network = yes
- ;debug state = yes
- ;debug tunnel = yes
- [lns default]
- ip range = 192.168.42.10-192.168.42.250
- local ip = 192.168.42.1
- require chap = yes
- refuse pap = yes
- require authentication = yes
- name = l2tpd
- ;ppp debug = yes
- pppoptfile = /etc/ppp/options.xl2tpd
- length bit = yes
- EOF
- # Specify xl2tpd options
- /bin/cp -f /etc/ppp/options.xl2tpd "/etc/ppp/options.xl2tpd.old-$SYS_DT" 2>/dev/null
- 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
- # Create VPN credentials
- /bin/cp -f /etc/ppp/chap-secrets "/etc/ppp/chap-secrets.old-$SYS_DT" 2>/dev/null
- cat > /etc/ppp/chap-secrets <<EOF
- # Secrets for authentication using CHAP
- # client server secret IP addresses
- "$VPN_USER" l2tpd "$VPN_PASSWORD" *
- EOF
- # Update sysctl settings for VPN and performance
- if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
- /bin/cp -f /etc/sysctl.conf "/etc/sysctl.conf.old-$SYS_DT" 2>/dev/null
- cat >> /etc/sysctl.conf <<EOF
- # Added by hwdsl2 VPN script
- kernel.msgmnb = 65536
- kernel.msgmax = 65536
- kernel.shmmax = 68719476736
- kernel.shmall = 4294967296
- net.ipv4.ip_forward = 1
- net.ipv4.tcp_syncookies = 1
- net.ipv4.conf.all.accept_source_route = 0
- net.ipv4.conf.default.accept_source_route = 0
- 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.lo.send_redirects = 0
- net.ipv4.conf.eth0.send_redirects = 0
- net.ipv4.conf.all.rp_filter = 0
- net.ipv4.conf.default.rp_filter = 0
- net.ipv4.conf.lo.rp_filter = 0
- net.ipv4.conf.eth0.rp_filter = 0
- net.ipv4.icmp_echo_ignore_broadcasts = 1
- net.ipv4.icmp_ignore_bogus_error_responses = 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
- fi
- # Create basic IPTables rules. First check if there are existing rules.
- # 1. If IPTables is "empty", write out the new set of rules.
- # 2. If *not* empty, insert new rules and save them together with existing ones.
- if ! grep -qs "hwdsl2 VPN script" /etc/iptables.rules; then
- /bin/cp -f /etc/iptables.rules "/etc/iptables.rules.old-$SYS_DT" 2>/dev/null
- /usr/sbin/service fail2ban stop >/dev/null 2>&1
- if [ "$(/sbin/iptables-save | grep -c '^\-')" = "0" ]; then
- cat > /etc/iptables.rules <<EOF
- # Added by hwdsl2 VPN script
- *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 -d 127.0.0.0/8 -j REJECT
- -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 "$PRIVATE_IP"
- COMMIT
- EOF
- else
- iptables -I INPUT 1 -p udp -m multiport --dports 500,4500 -j ACCEPT
- iptables -I INPUT 2 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
- iptables -I INPUT 3 -p udp --dport 1701 -j DROP
- iptables -I FORWARD 1 -m conntrack --ctstate INVALID -j DROP
- iptables -I FORWARD 2 -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
- iptables -I FORWARD 3 -i ppp+ -o eth+ -j ACCEPT
- # iptables -I FORWARD 4 -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j ACCEPT
- iptables -A FORWARD -j DROP
- iptables -t nat -I POSTROUTING -s 192.168.42.0/24 -o eth+ -j SNAT --to-source "$PRIVATE_IP"
- echo "# Modified by hwdsl2 VPN script" > /etc/iptables.rules
- /sbin/iptables-save >> /etc/iptables.rules
- fi
- # Update rules for iptables-persistent
- if [ -f /etc/iptables/rules.v4 ]; then
- /bin/cp -f /etc/iptables/rules.v4 "/etc/iptables/rules.v4.old-$SYS_DT"
- /bin/cp -f /etc/iptables.rules /etc/iptables/rules.v4
- fi
- fi
- # Create basic IP6Tables (IPv6) rules
- if ! grep -qs "hwdsl2 VPN script" /etc/ip6tables.rules; then
- /bin/cp -f /etc/ip6tables.rules "/etc/ip6tables.rules.old-$SYS_DT" 2>/dev/null
- cat > /etc/ip6tables.rules <<EOF
- # Added by hwdsl2 VPN script
- *filter
- :INPUT ACCEPT [0:0]
- :FORWARD DROP [0:0]
- :OUTPUT ACCEPT [0:0]
- -A INPUT -i lo -j ACCEPT
- -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
- -A INPUT -m rt --rt-type 0 -j DROP
- -A INPUT -s fe80::/10 -j ACCEPT
- -A INPUT -p ipv6-icmp -j ACCEPT
- -A INPUT -j DROP
- COMMIT
- EOF
- if [ -f /etc/iptables/rules.v6 ]; then
- /bin/cp -f /etc/iptables/rules.v6 "/etc/iptables/rules.v6.old-$SYS_DT"
- /bin/cp -f /etc/ip6tables.rules /etc/iptables/rules.v6
- fi
- fi
- # Load IPTables rules at system boot
- cat > /etc/network/if-pre-up.d/iptablesload <<EOF
- #!/bin/sh
- /sbin/iptables-restore < /etc/iptables.rules
- exit 0
- EOF
- cat > /etc/network/if-pre-up.d/ip6tablesload <<EOF
- #!/bin/sh
- /sbin/ip6tables-restore < /etc/ip6tables.rules
- exit 0
- EOF
- # Update rc.local to start services at boot
- if ! grep -qs "hwdsl2 VPN script" /etc/rc.local; then
- /bin/cp -f /etc/rc.local "/etc/rc.local.old-$SYS_DT" 2>/dev/null
- /bin/sed --follow-symlinks -i -e '/^exit 0/d' /etc/rc.local
- cat >> /etc/rc.local <<EOF
- # Added by hwdsl2 VPN script
- /usr/sbin/service fail2ban restart || /bin/true
- /usr/sbin/service ipsec start
- /usr/sbin/service xl2tpd start
- echo 1 > /proc/sys/net/ipv4/ip_forward
- exit 0
- EOF
- fi
- # Initialize Libreswan DB
- 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
- # Reload sysctl.conf
- /sbin/sysctl -p
- # Update file attributes
- /bin/chmod +x /etc/rc.local
- /bin/chmod +x /etc/network/if-pre-up.d/iptablesload
- /bin/chmod +x /etc/network/if-pre-up.d/ip6tablesload
- /bin/chmod 600 /etc/ipsec.secrets* /etc/ppp/chap-secrets*
- # Apply new IPTables rules
- /sbin/iptables-restore < /etc/iptables.rules
- /sbin/ip6tables-restore < /etc/ip6tables.rules >/dev/null 2>&1
- # Restart services
- /usr/sbin/service fail2ban stop >/dev/null 2>&1
- /usr/sbin/service ipsec stop >/dev/null 2>&1
- /usr/sbin/service xl2tpd stop >/dev/null 2>&1
- /usr/sbin/service fail2ban start
- /usr/sbin/service ipsec start
- /usr/sbin/service xl2tpd start
- echo
- echo 'Congratulations! IPsec/L2TP VPN server setup is complete!'
- exit 0
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