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- #!/bin/sh
- #
- # Script for automatic setup of an IPsec VPN server on Ubuntu LTS and Debian 8.
- # Works on any dedicated server or Virtual Private Server (VPS) except OpenVZ.
- #
- # DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!
- #
- # The latest version of this script is available at:
- # https://github.com/hwdsl2/setup-ipsec-vpn
- #
- # Copyright (C) 2014-2016 Lin Song <linsongui@gmail.com>
- # 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!
- # =====================================================
- # Define your own values for these variables
- # - IPsec pre-shared key, VPN username and password
- # - All values MUST be placed inside 'single quotes'
- # - DO NOT use these characters within values: \ " '
- YOUR_IPSEC_PSK=''
- YOUR_USERNAME=''
- YOUR_PASSWORD=''
- # Important notes: https://git.io/vpnnotes
- # Setup VPN clients: https://git.io/vpnclients
- # =====================================================
- export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
- SYS_DT="$(date +%Y-%m-%d-%H:%M:%S)"; export SYS_DT
- exiterr() { echo "Error: $1" >&2; exit 1; }
- exiterr2() { echo "Error: 'apt-get install' failed." >&2; exit 1; }
- conf_bk() { /bin/cp -f "$1" "$1.old-$SYS_DT" 2>/dev/null; }
- check_ip() {
- 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])$"
- printf %s "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
- }
- os_type="$(lsb_release -si 2>/dev/null)"
- if [ "$os_type" != "Ubuntu" ] && [ "$os_type" != "Debian" ] && [ "$os_type" != "Raspbian" ]; then
- exiterr "This script only supports Ubuntu/Debian."
- fi
- if [ -f /proc/user_beancounters ]; then
- echo "Error: This script does not support OpenVZ VPS." >&2
- echo "Try OpenVPN: https://github.com/Nyr/openvpn-install" >&2
- exit 1
- fi
- if [ "$(id -u)" != 0 ]; then
- exiterr "Script must be run as root. Try 'sudo sh $0'"
- fi
- NET_IF0=${VPN_IFACE:-'ens3'}
- NET_IFS=${VPN_IFACE:-'ens+'}
- if_state=$(cat "/sys/class/net/$NET_IF0/operstate" 2>/dev/null)
- if [ -z "$if_state" ] || [ "$if_state" = "down" ] || [ "$NET_IF0" = "lo" ]; then
- echo "Error: Network interface '$NET_IF0' is not available." >&2
- cat 1>&2 <<'EOF'
- DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!
- If running on a server, try this workaround:
- VPN_IFACE="$(route | grep '^default' | grep -o '[^ ]*$')"
- EOF
- cat 1>&2 <<EOF
- sudo VPN_IFACE="\$VPN_IFACE" sh "$0"
- EOF
- exit 1
- fi
- [ -n "$YOUR_IPSEC_PSK" ] && VPN_IPSEC_PSK="$YOUR_IPSEC_PSK"
- [ -n "$YOUR_USERNAME" ] && VPN_USER="$YOUR_USERNAME"
- [ -n "$YOUR_PASSWORD" ] && VPN_PASSWORD="$YOUR_PASSWORD"
- if [ -z "$VPN_IPSEC_PSK" ] && [ -z "$VPN_USER" ] && [ -z "$VPN_PASSWORD" ]; then
- echo "VPN credentials not set by user. Generating random PSK and password..."
- echo
- VPN_IPSEC_PSK="$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)"
- VPN_USER=vpnuser
- VPN_PASSWORD="$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)"
- fi
- if [ -z "$VPN_IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
- exiterr "All VPN credentials must be specified. Edit the script and re-enter them."
- fi
- case "$VPN_IPSEC_PSK $VPN_USER $VPN_PASSWORD" in
- *[\\\"\']*)
- exiterr "VPN credentials must not contain any of these characters: \\ \" '"
- ;;
- esac
- if [ "$(sed 's/\..*//' /etc/debian_version 2>/dev/null)" = "7" ]; then
- cat <<'EOF'
- IMPORTANT: Workaround required for Debian 7 (Wheezy).
- You must first run the script at: https://git.io/vpndeb7
- If not already done so, press Ctrl-C to interrupt now.
- Continuing in 30 seconds ...
- EOF
- sleep 30
- fi
- echo "VPN setup in progress... Please be patient."
- echo
- # Create and change to working dir
- mkdir -p /opt/src
- cd /opt/src || exiterr "Cannot enter /opt/src."
- # Update package index
- export DEBIAN_FRONTEND=noninteractive
- apt-get -yq update || exiterr "'apt-get update' failed."
- # Make sure basic commands exist
- apt-get -yq install wget dnsutils openssl || exiterr2
- apt-get -yq install iproute gawk grep sed net-tools || exiterr2
- cat <<'EOF'
- Trying to auto discover IPs of this server...
- In case the script hangs here for more than a few minutes,
- use Ctrl-C to interrupt. Then edit it and manually enter IPs.
- EOF
- # In case auto IP discovery fails, you may manually enter server IPs here.
- # If your server only has a public IP, put that public IP on both lines.
- PUBLIC_IP=${VPN_PUBLIC_IP:-''}
- PRIVATE_IP=${VPN_PRIVATE_IP:-''}
- # Try to auto discover IPs of this server
- [ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
- [ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ip -4 route get 1 | awk '{print $NF;exit}')
- # Check IPs for correct format
- check_ip "$PUBLIC_IP" || PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
- check_ip "$PUBLIC_IP" || exiterr "Cannot find valid public IP. Edit the script and manually enter IPs."
- check_ip "$PRIVATE_IP" || PRIVATE_IP=$(ifconfig "$NET_IF0" | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*')
- check_ip "$PRIVATE_IP" || exiterr "Cannot find valid private IP. Edit the script and manually enter IPs."
- # Install necessary packages
- apt-get -yq install libnss3-dev libnspr4-dev pkg-config libpam0g-dev \
- libcap-ng-dev libcap-ng-utils libselinux1-dev \
- libcurl4-nss-dev flex bison gcc make \
- libunbound-dev libnss3-tools libevent-dev || exiterr2
- apt-get -yq --no-install-recommends install xmlto || exiterr2
- apt-get -yq install ppp xl2tpd || exiterr2
- # Install Fail2Ban to protect SSH server
- apt-get -yq install fail2ban || exiterr2
- # Compile and install Libreswan
- swan_ver=3.18
- swan_file="libreswan-$swan_ver.tar.gz"
- swan_url1="https://download.libreswan.org/$swan_file"
- swan_url2="https://github.com/libreswan/libreswan/archive/v$swan_ver.tar.gz"
- if ! { wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url2"; }; then
- exiterr "Cannot download Libreswan source."
- fi
- /bin/rm -rf "/opt/src/libreswan-$swan_ver"
- tar xzf "$swan_file" && /bin/rm -f "$swan_file"
- cd "libreswan-$swan_ver" || exiterr "Cannot enter Libreswan source dir."
- echo "WERROR_CFLAGS =" > Makefile.inc.local
- if [ "$(packaging/utils/lswan_detect.sh init)" = "systemd" ]; then
- apt-get -yq install libsystemd-dev || exiterr2
- fi
- make -s programs && make -s install
- # Verify the install and clean up
- cd /opt/src || exiterr "Cannot enter /opt/src."
- /bin/rm -rf "/opt/src/libreswan-$swan_ver"
- if ! /usr/local/sbin/ipsec --version 2>/dev/null | grep -qs "$swan_ver"; then
- exiterr "Libreswan $swan_ver failed to build."
- fi
- # Create IPsec (Libreswan) config
- conf_bk "/etc/ipsec.conf"
- cat > /etc/ipsec.conf <<EOF
- version 2.0
- config setup
- nat_traversal=yes
- virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!192.168.42.0/23
- protostack=netkey
- nhelpers=0
- interfaces=%defaultroute
- uniqueids=no
- conn shared
- left=$PRIVATE_IP
- leftid=$PUBLIC_IP
- right=%any
- forceencaps=yes
- authby=secret
- pfs=no
- rekey=no
- keyingtries=5
- dpddelay=30
- dpdtimeout=120
- dpdaction=clear
- ike=3des-sha1,aes-sha1,aes256-sha2_512,aes256-sha2_256
- phase2alg=3des-sha1,aes-sha1,aes256-sha2_512,aes256-sha2_256
- conn l2tp-psk
- auto=add
- leftsubnet=$PRIVATE_IP/32
- leftnexthop=%defaultroute
- leftprotoport=17/1701
- rightprotoport=17/%any
- type=transport
- auth=esp
- also=shared
- conn xauth-psk
- auto=add
- leftsubnet=0.0.0.0/0
- rightaddresspool=192.168.43.10-192.168.43.250
- modecfgdns1=8.8.8.8
- modecfgdns2=8.8.4.4
- leftxauthserver=yes
- rightxauthclient=yes
- leftmodecfgserver=yes
- rightmodecfgclient=yes
- modecfgpull=yes
- xauthby=file
- ike-frag=yes
- ikev2=never
- cisco-unity=yes
- also=shared
- EOF
- # Specify IPsec PSK
- conf_bk "/etc/ipsec.secrets"
- cat > /etc/ipsec.secrets <<EOF
- $PUBLIC_IP %any : PSK "$VPN_IPSEC_PSK"
- EOF
- # Create xl2tpd config
- conf_bk "/etc/xl2tpd/xl2tpd.conf"
- cat > /etc/xl2tpd/xl2tpd.conf <<'EOF'
- [global]
- port = 1701
- [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
- pppoptfile = /etc/ppp/options.xl2tpd
- length bit = yes
- EOF
- # Set xl2tpd options
- conf_bk "/etc/ppp/options.xl2tpd"
- 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
- mtu 1280
- mru 1280
- lock
- proxyarp
- lcp-echo-failure 4
- lcp-echo-interval 30
- connect-delay 5000
- EOF
- # Create VPN credentials
- conf_bk "/etc/ppp/chap-secrets"
- cat > /etc/ppp/chap-secrets <<EOF
- # Secrets for authentication using CHAP
- # client server secret IP addresses
- "$VPN_USER" l2tpd "$VPN_PASSWORD" *
- EOF
- conf_bk "/etc/ipsec.d/passwd"
- VPN_PASSWORD_ENC=$(openssl passwd -1 "$VPN_PASSWORD")
- cat > /etc/ipsec.d/passwd <<EOF
- $VPN_USER:$VPN_PASSWORD_ENC:xauth-psk
- EOF
- # Update sysctl settings
- if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
- conf_bk "/etc/sysctl.conf"
- 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.$NET_IF0.send_redirects = 0
- net.ipv4.conf.all.rp_filter = 0
- net.ipv4.conf.default.rp_filter = 0
- net.ipv4.conf.lo.rp_filter = 0
- net.ipv4.conf.$NET_IF0.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
- # Check if IPTables rules need updating
- ipt_flag=0
- IPT_FILE="/etc/iptables.rules"
- if ! grep -qs "hwdsl2 VPN script" "$IPT_FILE" \
- || ! iptables -t nat -C POSTROUTING -s 192.168.42.0/24 -o "$NET_IFS" -j SNAT --to-source "$PRIVATE_IP" 2>/dev/null \
- || ! iptables -t nat -C POSTROUTING -s 192.168.43.0/24 -o "$NET_IFS" -m policy --dir out --pol none -j SNAT --to-source "$PRIVATE_IP" 2>/dev/null; then
- ipt_flag=1
- fi
- # Add IPTables rules for VPN
- if [ "$ipt_flag" = "1" ]; then
- service fail2ban stop >/dev/null 2>&1
- iptables-save > "$IPT_FILE.old-$SYS_DT"
- iptables -I INPUT 1 -m conntrack --ctstate INVALID -j DROP
- iptables -I INPUT 2 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
- iptables -I INPUT 3 -p udp -m multiport --dports 500,4500 -j ACCEPT
- iptables -I INPUT 4 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
- iptables -I INPUT 5 -p udp --dport 1701 -j DROP
- iptables -I FORWARD 1 -m conntrack --ctstate INVALID -j DROP
- iptables -I FORWARD 2 -i "$NET_IFS" -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
- iptables -I FORWARD 3 -i ppp+ -o "$NET_IFS" -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 -I FORWARD 5 -i "$NET_IFS" -d 192.168.43.0/24 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
- iptables -I FORWARD 6 -s 192.168.43.0/24 -o "$NET_IFS" -j ACCEPT
- # Uncomment if you wish to disallow traffic between VPN clients themselves
- # iptables -I FORWARD 2 -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j DROP
- # iptables -I FORWARD 3 -s 192.168.43.0/24 -d 192.168.43.0/24 -j DROP
- iptables -A FORWARD -j DROP
- iptables -t nat -I POSTROUTING -s 192.168.43.0/24 -o "$NET_IFS" -m policy --dir out --pol none -j SNAT --to-source "$PRIVATE_IP"
- iptables -t nat -I POSTROUTING -s 192.168.42.0/24 -o "$NET_IFS" -j SNAT --to-source "$PRIVATE_IP"
- echo "# Modified by hwdsl2 VPN script" > "$IPT_FILE"
- iptables-save >> "$IPT_FILE"
- # Update rules for iptables-persistent
- IPT_FILE2="/etc/iptables/rules.v4"
- if [ -f "$IPT_FILE2" ]; then
- conf_bk "$IPT_FILE2"
- /bin/cp -f "$IPT_FILE" "$IPT_FILE2"
- fi
- fi
- # Load IPTables rules at boot
- mkdir -p /etc/network/if-pre-up.d
- cat > /etc/network/if-pre-up.d/iptablesload <<'EOF'
- #!/bin/sh
- iptables-restore < /etc/iptables.rules
- exit 0
- EOF
- # Start services at boot
- update-rc.d fail2ban enable >/dev/null 2>&1
- systemctl enable fail2ban >/dev/null 2>&1
- if ! grep -qs "hwdsl2 VPN script" /etc/rc.local; then
- conf_bk "/etc/rc.local"
- sed --follow-symlinks -i '/^exit 0/d' /etc/rc.local
- cat >> /etc/rc.local <<'EOF'
- # Added by hwdsl2 VPN script
- service ipsec start
- service xl2tpd start
- echo 1 > /proc/sys/net/ipv4/ip_forward
- exit 0
- EOF
- if grep -qs raspbian /etc/os-release; then
- sed --follow-symlinks -i '/hwdsl2 VPN script/a sleep 15' /etc/rc.local
- fi
- fi
- # Reload sysctl.conf
- sysctl -e -q -p
- # Update file attributes
- chmod +x /etc/rc.local /etc/network/if-pre-up.d/iptablesload
- chmod 600 /etc/ipsec.secrets* /etc/ppp/chap-secrets* /etc/ipsec.d/passwd*
- # Apply new IPTables rules
- iptables-restore < "$IPT_FILE"
- # Restart services
- service fail2ban restart 2>/dev/null
- service ipsec restart 2>/dev/null
- service xl2tpd restart 2>/dev/null
- cat <<EOF
- ================================================
- IPsec VPN server is now ready for use!
- Connect to your new VPN with these details:
- Server IP: $PUBLIC_IP
- IPsec PSK: $VPN_IPSEC_PSK
- Username: $VPN_USER
- Password: $VPN_PASSWORD
- Write these down. You'll need them to connect!
- Important notes: https://git.io/vpnnotes
- Setup VPN clients: https://git.io/vpnclients
- ================================================
- EOF
- exit 0
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