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vpnsetup.sh

+#!/bin/sh
+#
+# Script for automatic setup of an IPsec VPN server on Ubuntu and Debian.
+# 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) 2014-2020 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 special characters within values: \ " '
+
+YOUR_IPSEC_PSK=''
+YOUR_USERNAME=''
+YOUR_PASSWORD=''
+
+# Important notes:   https://git.io/vpnnotes
+# Setup VPN clients: https://git.io/vpnclients
+# IKEv2 guide:       https://git.io/ikev2
+
+# =====================================================
+
+export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+SYS_DT=$(date +%F-%T | tr ':' '_')
+
+exiterr()  { echo "Error: $1" >&2; exit 1; }
+exiterr2() { exiterr "'apt-get install' failed."; }
+conf_bk() { /bin/cp -f "$1" "$1.old-$SYS_DT" 2>/dev/null; }
+bigecho() { echo; echo "## $1"; echo; }
+
+check_ip() {
+  IP_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
+  printf '%s' "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
+}
+
+vpnsetup() {
+
+os_type=$(lsb_release -si 2>/dev/null)
+if [ -z "$os_type" ]; then
+  [ -f /etc/os-release  ] && os_type=$(. /etc/os-release  && printf '%s' "$ID")
+  [ -f /etc/lsb-release ] && os_type=$(. /etc/lsb-release && printf '%s' "$DISTRIB_ID")
+fi
+if ! printf '%s' "$os_type" | head -n 1 | grep -qiF -e ubuntu -e debian -e raspbian; then
+  echo "Error: This script only supports Ubuntu and Debian." >&2
+  echo "For CentOS/RHEL, use https://git.io/vpnsetup-centos" >&2
+  exit 1
+fi
+
+if [ "$(sed 's/\..*//' /etc/debian_version)" = "7" ]; then
+  exiterr "Debian 7 is not supported."
+fi
+
+if [ -f /proc/user_beancounters ]; then
+  exiterr "OpenVZ VPS is not supported. Try OpenVPN: github.com/Nyr/openvpn-install"
+fi
+
+if [ "$(id -u)" != 0 ]; then
+  exiterr "Script must be run as root. Try 'sudo sh $0'"
+fi
+
+def_iface=$(route 2>/dev/null | grep -m 1 '^default' | grep -o '[^ ]*$')
+[ -z "$def_iface" ] && def_iface=$(ip -4 route list 0/0 2>/dev/null | grep -m 1 -Po '(?<=dev )(\S+)')
+def_state=$(cat "/sys/class/net/$def_iface/operstate" 2>/dev/null)
+if [ -n "$def_state" ] && [ "$def_state" != "down" ]; then
+  if ! uname -m | grep -qi '^arm'; then
+    case "$def_iface" in
+      wl*)
+        exiterr "Wireless interface '$def_iface' detected. DO NOT run this script on your PC or Mac!"
+        ;;
+    esac
+  fi
+  NET_IFACE="$def_iface"
+else
+  eth0_state=$(cat "/sys/class/net/eth0/operstate" 2>/dev/null)
+  if [ -z "$eth0_state" ] || [ "$eth0_state" = "down" ]; then
+    exiterr "Could not detect the default network interface."
+  fi
+  NET_IFACE=eth0
+fi
+
+[ -n "$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
+  bigecho "VPN credentials not set by user. Generating random PSK and password..."
+  VPN_IPSEC_PSK=$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 20)
+  VPN_USER=vpnuser
+  VPN_PASSWORD=$(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 "$VPN_PASSWORD" ]; then
+  exiterr "All VPN credentials must be specified. Edit the script and re-enter them."
+fi
+
+if printf '%s' "$VPN_IPSEC_PSK $VPN_USER $VPN_PASSWORD" | LC_ALL=C grep -q '[^ -~]\+'; then
+  exiterr "VPN credentials must not contain non-ASCII characters."
+fi
+
+case "$VPN_IPSEC_PSK $VPN_USER $VPN_PASSWORD" in
+  *[\\\"\']*)
+    exiterr "VPN credentials must not contain these special characters: \\ \" '"
+    ;;
+esac
+
+if { [ -n "$VPN_DNS_SRV1" ] && ! check_ip "$VPN_DNS_SRV1"; } \
+  || { [ -n "$VPN_DNS_SRV2" ] && ! check_ip "$VPN_DNS_SRV2"; } then
+  exiterr "The DNS server specified is invalid."
+fi
+
+if [ -x /sbin/iptables ] && ! iptables -nL INPUT >/dev/null 2>&1; then
+  exiterr "IPTables check failed. Reboot and re-run this script."
+fi
+
+bigecho "VPN setup in progress... Please be patient."
+
+# Create and change to working dir
+mkdir -p /opt/src
+cd /opt/src || exit 1
+
+count=0
+APT_LK=/var/lib/apt/lists/lock
+PKG_LK=/var/lib/dpkg/lock
+while fuser "$APT_LK" "$PKG_LK" >/dev/null 2>&1 \
+  || lsof "$APT_LK" >/dev/null 2>&1 || lsof "$PKG_LK" >/dev/null 2>&1; do
+  [ "$count" = "0" ] && bigecho "Waiting for apt to be available..."
+  [ "$count" -ge "60" ] && exiterr "Could not get apt/dpkg lock."
+  count=$((count+1))
+  printf '%s' '.'
+  sleep 3
+done
+
+bigecho "Populating apt-get cache..."
+
+export DEBIAN_FRONTEND=noninteractive
+apt-get -yq update || exiterr "'apt-get update' failed."
+
+bigecho "Installing packages required for setup..."
+
+apt-get -yq install wget dnsutils openssl \
+  iptables iproute2 gawk grep sed net-tools || exiterr2
+
+bigecho "Trying to auto discover IP of this server..."
+
+cat <<'EOF'
+In case the script hangs here for more than a few minutes,
+press Ctrl-C to abort. Then edit it and manually enter IP.
+EOF
+
+# In case auto IP discovery fails, enter server's public IP here.
+PUBLIC_IP=${VPN_PUBLIC_IP:-''}
+
+[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
+
+check_ip "$PUBLIC_IP" || PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
+check_ip "$PUBLIC_IP" || exiterr "Cannot detect this server's public IP. Edit the script and manually enter it."
+
+bigecho "Installing packages required for the VPN..."
+
+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 libnss3-tools \
+  libevent-dev ppp xl2tpd || exiterr2
+
+bigecho "Installing Fail2Ban to protect SSH..."
+
+apt-get -yq install fail2ban || exiterr2
+
+bigecho "Compiling and installing Libreswan..."
+
+SWAN_VER=3.32
+swan_file="libreswan-$SWAN_VER.tar.gz"
+swan_url1="https://github.com/libreswan/libreswan/archive/v$SWAN_VER.tar.gz"
+swan_url2="https://download.libreswan.org/$swan_file"
+if ! { wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url2"; }; then
+  exit 1
+fi
+/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
+tar xzf "$swan_file" && /bin/rm -f "$swan_file"
+cd "libreswan-$SWAN_VER" || exit 1
+cat > Makefile.inc.local <<'EOF'
+WERROR_CFLAGS = -w
+USE_DNSSEC = false
+USE_DH2 = true
+USE_DH31 = false
+USE_NSS_AVA_COPY = true
+USE_NSS_IPSEC_PROFILE = false
+USE_GLIBC_KERN_FLIP_HEADERS = true
+EOF
+if ! grep -qs IFLA_XFRM_LINK /usr/include/linux/if_link.h; then
+  echo "USE_XFRM_INTERFACE_IFLA_HEADER = true" >> Makefile.inc.local
+fi
+if [ "$(packaging/utils/lswan_detect.sh init)" = "systemd" ]; then
+  apt-get -yq install libsystemd-dev || exiterr2
+fi
+NPROCS=$(grep -c ^processor /proc/cpuinfo)
+[ -z "$NPROCS" ] && NPROCS=1
+make "-j$((NPROCS+1))" -s base && make -s install-base
+
+cd /opt/src || exit 1
+/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
+if ! /usr/local/sbin/ipsec --version 2>/dev/null | grep -qF "$SWAN_VER"; then
+  exiterr "Libreswan $SWAN_VER failed to build."
+fi
+
+bigecho "Creating VPN configuration..."
+
+L2TP_NET=${VPN_L2TP_NET:-'192.168.42.0/24'}
+L2TP_LOCAL=${VPN_L2TP_LOCAL:-'192.168.42.1'}
+L2TP_POOL=${VPN_L2TP_POOL:-'192.168.42.10-192.168.42.250'}
+XAUTH_NET=${VPN_XAUTH_NET:-'192.168.43.0/24'}
+XAUTH_POOL=${VPN_XAUTH_POOL:-'192.168.43.10-192.168.43.250'}
+DNS_SRV1=${VPN_DNS_SRV1:-'8.8.8.8'}
+DNS_SRV2=${VPN_DNS_SRV2:-'8.8.4.4'}
+DNS_SRVS="\"$DNS_SRV1 $DNS_SRV2\""
+[ -n "$VPN_DNS_SRV1" ] && [ -z "$VPN_DNS_SRV2" ] && DNS_SRVS="$DNS_SRV1"
+
+# Create IPsec config
+conf_bk "/etc/ipsec.conf"
+cat > /etc/ipsec.conf <<EOF
+version 2.0
+
+config setup
+  virtual-private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!$L2TP_NET,%v4:!$XAUTH_NET
+  protostack=netkey
+  interfaces=%defaultroute
+  uniqueids=no
+
+conn shared
+  left=%defaultroute
+  leftid=$PUBLIC_IP
+  right=%any
+  encapsulation=yes
+  authby=secret
+  pfs=no
+  rekey=no
+  keyingtries=5
+  dpddelay=30
+  dpdtimeout=120
+  dpdaction=clear
+  ikev2=never
+  ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024
+  phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes256-sha2_512,aes128-sha2,aes256-sha2
+  sha2-truncbug=no
+
+conn l2tp-psk
+  auto=add
+  leftprotoport=17/1701
+  rightprotoport=17/%any
+  type=transport
+  phase2=esp
+  also=shared
+
+conn xauth-psk
+  auto=add
+  leftsubnet=0.0.0.0/0
+  rightaddresspool=$XAUTH_POOL
+  modecfgdns=$DNS_SRVS
+  leftxauthserver=yes
+  rightxauthclient=yes
+  leftmodecfgserver=yes
+  rightmodecfgclient=yes
+  modecfgpull=yes
+  xauthby=file
+  ike-frag=yes
+  cisco-unity=yes
+  also=shared
+
+include /etc/ipsec.d/*.conf
+EOF
+
+if uname -m | grep -qi '^arm'; then
+  if ! modprobe -q sha512; then
+    sed -i '/phase2alg/s/,aes256-sha2_512//' /etc/ipsec.conf
+  fi
+fi
+
+# Specify IPsec PSK
+conf_bk "/etc/ipsec.secrets"
+cat > /etc/ipsec.secrets <<EOF
+%any  %any  : PSK "$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 = $L2TP_POOL
+local ip = $L2TP_LOCAL
+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
++mschap-v2
+ipcp-accept-local
+ipcp-accept-remote
+noccp
+auth
+mtu 1280
+mru 1280
+proxyarp
+lcp-echo-failure 4
+lcp-echo-interval 30
+connect-delay 5000
+ms-dns $DNS_SRV1
+EOF
+
+if [ -z "$VPN_DNS_SRV1" ] || [ -n "$VPN_DNS_SRV2" ]; then
+cat >> /etc/ppp/options.xl2tpd <<EOF
+ms-dns $DNS_SRV2
+EOF
+fi
+
+# Create VPN credentials
+conf_bk "/etc/ppp/chap-secrets"
+cat > /etc/ppp/chap-secrets <<EOF
+"$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:$VPN_PASSWORD_ENC:xauth-psk
+EOF
+
+bigecho "Updating sysctl settings..."
+
+if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
+  conf_bk "/etc/sysctl.conf"
+  if [ "$(getconf LONG_BIT)" = "64" ]; then
+    SHM_MAX=68719476736
+    SHM_ALL=4294967296
+  else
+    SHM_MAX=4294967295
+    SHM_ALL=268435456
+  fi
+cat >> /etc/sysctl.conf <<EOF
+
+# Added by hwdsl2 VPN script
+kernel.msgmnb = 65536
+kernel.msgmax = 65536
+kernel.shmmax = $SHM_MAX
+kernel.shmall = $SHM_ALL
+
+net.ipv4.ip_forward = 1
+net.ipv4.conf.all.accept_source_route = 0
+net.ipv4.conf.all.accept_redirects = 0
+net.ipv4.conf.all.send_redirects = 0
+net.ipv4.conf.all.rp_filter = 0
+net.ipv4.conf.default.accept_source_route = 0
+net.ipv4.conf.default.accept_redirects = 0
+net.ipv4.conf.default.send_redirects = 0
+net.ipv4.conf.default.rp_filter = 0
+net.ipv4.conf.$NET_IFACE.send_redirects = 0
+net.ipv4.conf.$NET_IFACE.rp_filter = 0
+
+net.core.wmem_max = 12582912
+net.core.rmem_max = 12582912
+net.ipv4.tcp_rmem = 10240 87380 12582912
+net.ipv4.tcp_wmem = 10240 87380 12582912
+EOF
+fi
+
+bigecho "Updating IPTables rules..."
+
+IPT_FILE=/etc/iptables.rules
+IPT_FILE2=/etc/iptables/rules.v4
+ipt_flag=0
+if ! grep -qs "hwdsl2 VPN script" "$IPT_FILE"; then
+  ipt_flag=1
+fi
+
+if [ "$ipt_flag" = "1" ]; then
+  service fail2ban stop >/dev/null 2>&1
+  iptables-save > "$IPT_FILE.old-$SYS_DT"
+  iptables -I INPUT 1 -p udp --dport 1701 -m policy --dir in --pol none -j DROP
+  iptables -I INPUT 2 -m conntrack --ctstate INVALID -j DROP
+  iptables -I INPUT 3 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+  iptables -I INPUT 4 -p udp -m multiport --dports 500,4500 -j ACCEPT
+  iptables -I INPUT 5 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
+  iptables -I INPUT 6 -p udp --dport 1701 -j DROP
+  iptables -I FORWARD 1 -m conntrack --ctstate INVALID -j DROP
+  iptables -I FORWARD 2 -i "$NET_IFACE" -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+  iptables -I FORWARD 3 -i ppp+ -o "$NET_IFACE" -j ACCEPT
+  iptables -I FORWARD 4 -i ppp+ -o ppp+ -s "$L2TP_NET" -d "$L2TP_NET" -j ACCEPT
+  iptables -I FORWARD 5 -i "$NET_IFACE" -d "$XAUTH_NET" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+  iptables -I FORWARD 6 -s "$XAUTH_NET" -o "$NET_IFACE" -j ACCEPT
+  # Uncomment to disallow traffic between VPN clients
+  # iptables -I FORWARD 2 -i ppp+ -o ppp+ -s "$L2TP_NET" -d "$L2TP_NET" -j DROP
+  # iptables -I FORWARD 3 -s "$XAUTH_NET" -d "$XAUTH_NET" -j DROP
+  iptables -A FORWARD -j DROP
+  iptables -t nat -I POSTROUTING -s "$XAUTH_NET" -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE
+  iptables -t nat -I POSTROUTING -s "$L2TP_NET" -o "$NET_IFACE" -j MASQUERADE
+  echo "# Modified by hwdsl2 VPN script" > "$IPT_FILE"
+  iptables-save >> "$IPT_FILE"
+
+  if [ -f "$IPT_FILE2" ]; then
+    conf_bk "$IPT_FILE2"
+    /bin/cp -f "$IPT_FILE" "$IPT_FILE2"
+  fi
+fi
+
+bigecho "Enabling services on boot..."
+
+IPT_PST=/etc/init.d/iptables-persistent
+IPT_PST2=/usr/share/netfilter-persistent/plugins.d/15-ip4tables
+ipt_load=1
+if [ -f "$IPT_FILE2" ] && { [ -f "$IPT_PST" ] || [ -f "$IPT_PST2" ]; }; then
+  ipt_load=0
+fi
+
+if [ "$ipt_load" = "1" ]; then
+  mkdir -p /etc/network/if-pre-up.d
+cat > /etc/network/if-pre-up.d/iptablesload <<'EOF'
+#!/bin/sh
+iptables-restore < /etc/iptables.rules
+exit 0
+EOF
+  chmod +x /etc/network/if-pre-up.d/iptablesload
+
+  if [ -f /usr/sbin/netplan ]; then
+    mkdir -p /etc/systemd/system
+cat > /etc/systemd/system/load-iptables-rules.service <<'EOF'
+[Unit]
+Description = Load /etc/iptables.rules
+DefaultDependencies=no
+
+Before=network-pre.target
+Wants=network-pre.target
+
+Wants=systemd-modules-load.service local-fs.target
+After=systemd-modules-load.service local-fs.target
+
+[Service]
+Type=oneshot
+ExecStart=/etc/network/if-pre-up.d/iptablesload
+
+[Install]
+WantedBy=multi-user.target
+EOF
+    systemctl enable load-iptables-rules 2>/dev/null
+  fi
+fi
+
+for svc in fail2ban ipsec xl2tpd; do
+  update-rc.d "$svc" enable >/dev/null 2>&1
+  systemctl enable "$svc" 2>/dev/null
+done
+
+if ! grep -qs "hwdsl2 VPN script" /etc/rc.local; then
+  if [ -f /etc/rc.local ]; then
+    conf_bk "/etc/rc.local"
+    sed --follow-symlinks -i '/^exit 0/d' /etc/rc.local
+  else
+    echo '#!/bin/sh' > /etc/rc.local
+  fi
+cat >> /etc/rc.local <<'EOF'
+
+# Added by hwdsl2 VPN script
+(sleep 15
+service ipsec restart
+service xl2tpd restart
+echo 1 > /proc/sys/net/ipv4/ip_forward)&
+exit 0
+EOF
+fi
+
+bigecho "Starting services..."
+
+sysctl -e -q -p
+
+chmod +x /etc/rc.local
+chmod 600 /etc/ipsec.secrets* /etc/ppp/chap-secrets* /etc/ipsec.d/passwd*
+
+mkdir -p /run/pluto
+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: $VPN_PASSWORD
+
+Write these down. You'll need them to connect!
+
+Important notes:   https://git.io/vpnnotes
+Setup VPN clients: https://git.io/vpnclients
+IKEv2 guide:       https://git.io/ikev2
+
+================================================
+
+EOF
+
+}
+
+## Defer setup until we have the complete script
+vpnsetup "$@"
+
+exit 0