725 lines
21 KiB
Bash
Executable File
725 lines
21 KiB
Bash
Executable File
#!/bin/bash
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#
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# Script for automatic setup of an IPsec VPN server on Ubuntu and Debian
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#
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# DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!
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#
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# The latest version of this script is available at:
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# https://github.com/hwdsl2/setup-ipsec-vpn
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#
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# Copyright (C) 2014-2022 Lin Song <linsongui@gmail.com>
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# Based on the work of Thomas Sarlandie (Copyright 2012)
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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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# =====================================================
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# Define your own values for these variables
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# - IPsec pre-shared key, VPN username and password
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# - All values MUST be placed inside 'single quotes'
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# - DO NOT use these special characters within values: \ " '
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YOUR_IPSEC_PSK=''
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YOUR_USERNAME=''
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YOUR_PASSWORD=''
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# Important notes: vpnsetup.net/notes
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# Setup VPN clients: vpnsetup.net/clients
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# IKEv2 guide: vpnsetup.net/ikev2
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# =====================================================
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export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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SYS_DT=$(date +%F-%T | tr ':' '_')
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exiterr() { echo "Error: $1" >&2; exit 1; }
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exiterr2() { exiterr "'apt-get install' failed."; }
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conf_bk() { /bin/cp -f "$1" "$1.old-$SYS_DT" 2>/dev/null; }
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bigecho() { echo "## $1"; }
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check_ip() {
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IP_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
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printf '%s' "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
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}
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check_dns_name() {
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FQDN_REGEX='^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$'
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printf '%s' "$1" | tr -d '\n' | grep -Eq "$FQDN_REGEX"
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}
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check_root() {
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if [ "$(id -u)" != 0 ]; then
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exiterr "Script must be run as root. Try 'sudo bash $0'"
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fi
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}
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check_vz() {
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if [ -f /proc/user_beancounters ]; then
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exiterr "OpenVZ VPS is not supported."
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fi
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}
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check_lxc() {
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# shellcheck disable=SC2154
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if [ "$container" = "lxc" ] && [ ! -e /dev/ppp ]; then
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cat 1>&2 <<'EOF'
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Error: /dev/ppp is missing. LXC containers require configuration.
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See: https://github.com/hwdsl2/setup-ipsec-vpn/issues/1014
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EOF
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exit 1
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fi
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}
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check_os() {
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os_type=$(lsb_release -si 2>/dev/null)
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[ -z "$os_type" ] && [ -f /etc/os-release ] && os_type=$(. /etc/os-release && printf '%s' "$ID")
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case $os_type in
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[Uu]buntu)
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os_type=ubuntu
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;;
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[Dd]ebian)
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os_type=debian
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;;
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[Rr]aspbian)
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os_type=raspbian
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;;
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*)
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exiterr "This script only supports Ubuntu and Debian."
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;;
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esac
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os_ver=$(sed 's/\..*//' /etc/debian_version | tr -dc 'A-Za-z0-9')
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if [ "$os_ver" = "8" ] || [ "$os_ver" = "jessiesid" ]; then
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exiterr "Debian 8 or Ubuntu < 16.04 is not supported."
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fi
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}
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check_iface() {
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def_iface=$(route 2>/dev/null | grep -m 1 '^default' | grep -o '[^ ]*$')
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[ -z "$def_iface" ] && def_iface=$(ip -4 route list 0/0 2>/dev/null | grep -m 1 -Po '(?<=dev )(\S+)')
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def_state=$(cat "/sys/class/net/$def_iface/operstate" 2>/dev/null)
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if [ -n "$def_state" ] && [ "$def_state" != "down" ]; then
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if ! uname -m | grep -qi -e '^arm' -e '^aarch64'; then
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case $def_iface in
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wl*)
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exiterr "Wireless interface '$def_iface' detected. DO NOT run this script on your PC or Mac!"
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;;
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esac
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fi
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NET_IFACE="$def_iface"
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else
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eth0_state=$(cat "/sys/class/net/eth0/operstate" 2>/dev/null)
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if [ -z "$eth0_state" ] || [ "$eth0_state" = "down" ]; then
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exiterr "Could not detect the default network interface."
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fi
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NET_IFACE=eth0
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fi
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}
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check_creds() {
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[ -n "$YOUR_IPSEC_PSK" ] && VPN_IPSEC_PSK="$YOUR_IPSEC_PSK"
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[ -n "$YOUR_USERNAME" ] && VPN_USER="$YOUR_USERNAME"
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[ -n "$YOUR_PASSWORD" ] && VPN_PASSWORD="$YOUR_PASSWORD"
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if [ -z "$VPN_IPSEC_PSK" ] && [ -z "$VPN_USER" ] && [ -z "$VPN_PASSWORD" ]; then
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bigecho "VPN credentials not set by user. Generating random PSK and password..."
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VPN_IPSEC_PSK=$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' </dev/urandom 2>/dev/null | head -c 20)
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VPN_USER=vpnuser
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VPN_PASSWORD=$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' </dev/urandom 2>/dev/null | head -c 16)
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fi
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if [ -z "$VPN_IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
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exiterr "All VPN credentials must be specified. Edit the script and re-enter them."
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fi
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if printf '%s' "$VPN_IPSEC_PSK $VPN_USER $VPN_PASSWORD" | LC_ALL=C grep -q '[^ -~]\+'; then
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exiterr "VPN credentials must not contain non-ASCII characters."
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fi
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case "$VPN_IPSEC_PSK $VPN_USER $VPN_PASSWORD" in
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*[\\\"\']*)
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exiterr "VPN credentials must not contain these special characters: \\ \" '"
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;;
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esac
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}
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check_dns() {
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if { [ -n "$VPN_DNS_SRV1" ] && ! check_ip "$VPN_DNS_SRV1"; } \
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|| { [ -n "$VPN_DNS_SRV2" ] && ! check_ip "$VPN_DNS_SRV2"; }; then
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exiterr "The DNS server specified is invalid."
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fi
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}
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check_server_dns() {
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if [ -n "$VPN_DNS_NAME" ] && ! check_dns_name "$VPN_DNS_NAME"; then
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exiterr "Invalid DNS name. 'VPN_DNS_NAME' must be a fully qualified domain name (FQDN)."
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fi
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}
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check_client_name() {
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if [ -n "$VPN_CLIENT_NAME" ]; then
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name_len="$(printf '%s' "$VPN_CLIENT_NAME" | wc -m)"
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if [ "$name_len" -gt "64" ] || printf '%s' "$VPN_CLIENT_NAME" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
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|| case $VPN_CLIENT_NAME in -*) true ;; *) false ;; esac; then
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exiterr "Invalid client name. Use one word only, no special characters except '-' and '_'."
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fi
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fi
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}
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check_subnets() {
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if [ -n "$VPN_L2TP_NET" ] || [ -n "$VPN_L2TP_LOCAL" ] || [ -n "$VPN_L2TP_POOL" ] \
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|| [ -n "$VPN_XAUTH_NET" ] || [ -n "$VPN_XAUTH_POOL" ]; then
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if grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
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echo "Error: You may only specify custom subnets during initial VPN install." >&2
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echo " See Advanced usage -> Customize VPN subnets for more information." >&2
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exit 1
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fi
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fi
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}
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check_iptables() {
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if [ -x /sbin/iptables ] && ! iptables -nL INPUT >/dev/null 2>&1; then
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exiterr "IPTables check failed. Reboot and re-run this script."
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fi
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}
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start_setup() {
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bigecho "VPN setup in progress... Please be patient."
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mkdir -p /opt/src
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cd /opt/src || exit 1
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}
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wait_for_apt() {
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count=0
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apt_lk=/var/lib/apt/lists/lock
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pkg_lk=/var/lib/dpkg/lock
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while fuser "$apt_lk" "$pkg_lk" >/dev/null 2>&1 \
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|| lsof "$apt_lk" >/dev/null 2>&1 || lsof "$pkg_lk" >/dev/null 2>&1; do
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[ "$count" = "0" ] && echo "## Waiting for apt to be available..."
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[ "$count" -ge "100" ] && exiterr "Could not get apt/dpkg lock."
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count=$((count+1))
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printf '%s' '.'
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sleep 3
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done
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}
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update_apt_cache() {
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bigecho "Installing packages required for setup..."
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export DEBIAN_FRONTEND=noninteractive
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(
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set -x
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apt-get -yqq update || apt-get -yqq update
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) || exiterr "'apt-get update' failed."
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}
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install_setup_pkgs() {
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(
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set -x
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apt-get -yqq install wget dnsutils openssl \
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iptables iproute2 gawk grep sed net-tools >/dev/null \
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|| apt-get -yqq install wget dnsutils openssl \
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iptables iproute2 gawk grep sed net-tools >/dev/null
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) || exiterr2
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}
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detect_ip() {
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bigecho "Trying to auto discover IP of this server..."
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public_ip=${VPN_PUBLIC_IP:-''}
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check_ip "$public_ip" || public_ip=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
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check_ip "$public_ip" || public_ip=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
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check_ip "$public_ip" || exiterr "Cannot detect this server's public IP. Define it as variable 'VPN_PUBLIC_IP' and re-run this script."
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}
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install_vpn_pkgs() {
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bigecho "Installing packages required for the VPN..."
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(
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set -x
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apt-get -yqq install libnss3-dev libnspr4-dev pkg-config \
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libpam0g-dev libcap-ng-dev libcap-ng-utils libselinux1-dev \
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libcurl4-nss-dev flex bison gcc make libnss3-tools \
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libevent-dev libsystemd-dev uuid-runtime ppp xl2tpd >/dev/null
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) || exiterr2
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}
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install_fail2ban() {
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bigecho "Installing Fail2Ban to protect SSH..."
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(
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set -x
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apt-get -yqq install fail2ban >/dev/null
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) || exiterr2
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}
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get_helper_scripts() {
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bigecho "Downloading helper scripts..."
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base_url1="https://github.com/hwdsl2/setup-ipsec-vpn/raw/master/extras"
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base_url2="https://gitlab.com/hwdsl2/setup-ipsec-vpn/-/raw/master/extras"
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ikev2_url1="$base_url1/ikev2setup.sh"
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ikev2_url2="$base_url2/ikev2setup.sh"
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add_url1="$base_url1/add_vpn_user.sh"
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add_url2="$base_url2/add_vpn_user.sh"
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del_url1="$base_url1/del_vpn_user.sh"
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del_url2="$base_url2/del_vpn_user.sh"
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cd /opt/src || exit 1
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printf '%s' "+ "
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for sc in ikev2.sh addvpnuser.sh delvpnuser.sh; do
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[ "$sc" = "ikev2.sh" ] && dl_url1="$ikev2_url1" && dl_url2="$ikev2_url2"
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[ "$sc" = "addvpnuser.sh" ] && dl_url1="$add_url1" && dl_url2="$add_url2"
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[ "$sc" = "delvpnuser.sh" ] && dl_url1="$del_url1" && dl_url2="$del_url2"
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printf '%s' "$sc "
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wget -t 3 -T 30 -q -O "$sc" "$dl_url1" \
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|| wget -t 3 -T 30 -q -O "$sc" "$dl_url2" || /bin/rm -f "$sc"
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[ -s "$sc" ] && chmod +x "$sc" && ln -s "/opt/src/$sc" /usr/bin 2>/dev/null
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done
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echo
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}
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get_swan_ver() {
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SWAN_VER=4.6
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base_url="https://github.com/hwdsl2/vpn-extras/releases/download/v1.0.0"
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swan_ver_url="$base_url/v1-$os_type-$os_ver-swanver"
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swan_ver_latest=$(wget -t 3 -T 15 -qO- "$swan_ver_url" 2>/dev/null | head -n 1)
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[ -z "$swan_ver_latest" ] && swan_ver_latest=$(curl -fsL "$swan_ver_url" 2>/dev/null | head -n 1)
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if printf '%s' "$swan_ver_latest" | grep -Eq '^([3-9]|[1-9][0-9]{1,2})(\.([0-9]|[1-9][0-9]{1,2})){1,2}$'; then
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SWAN_VER="$swan_ver_latest"
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fi
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}
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check_libreswan() {
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check_result=0
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ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
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swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
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ipsec_bin="/usr/local/sbin/ipsec"
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if [ -n "$swan_ver_old" ] && printf '%s' "$ipsec_ver" | grep -qi 'libreswan' \
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&& [ "$(find "$ipsec_bin" -mmin -10080)" ]; then
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check_result=1
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return 0
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fi
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get_swan_ver
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if [ -s "$ipsec_bin" ] && [ "$swan_ver_old" = "$SWAN_VER" ]; then
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touch "$ipsec_bin"
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fi
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[ "$swan_ver_old" = "$SWAN_VER" ] && check_result=1
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}
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get_libreswan() {
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if [ "$check_result" = "0" ]; then
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bigecho "Downloading Libreswan..."
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cd /opt/src || exit 1
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swan_file="libreswan-$SWAN_VER.tar.gz"
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swan_url1="https://github.com/libreswan/libreswan/archive/v$SWAN_VER.tar.gz"
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swan_url2="https://download.libreswan.org/$swan_file"
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(
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set -x
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wget -t 3 -T 30 -q -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -q -O "$swan_file" "$swan_url2"
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) || exit 1
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/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
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tar xzf "$swan_file" && /bin/rm -f "$swan_file"
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else
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bigecho "Libreswan $swan_ver_old is already installed, skipping..."
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fi
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}
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install_libreswan() {
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if [ "$check_result" = "0" ]; then
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bigecho "Compiling and installing Libreswan, please wait..."
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cd "libreswan-$SWAN_VER" || exit 1
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cat > Makefile.inc.local <<'EOF'
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WERROR_CFLAGS=-w -s
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USE_DNSSEC=false
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USE_DH2=true
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USE_NSS_KDF=false
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FINALNSSDIR=/etc/ipsec.d
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EOF
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if ! grep -qs 'VERSION_CODENAME=' /etc/os-release; then
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cat >> Makefile.inc.local <<'EOF'
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USE_DH31=false
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USE_NSS_AVA_COPY=true
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USE_NSS_IPSEC_PROFILE=false
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USE_GLIBC_KERN_FLIP_HEADERS=true
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EOF
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fi
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if ! grep -qs IFLA_XFRM_LINK /usr/include/linux/if_link.h; then
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echo "USE_XFRM_INTERFACE_IFLA_HEADER=true" >> Makefile.inc.local
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fi
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NPROCS=$(grep -c ^processor /proc/cpuinfo)
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[ -z "$NPROCS" ] && NPROCS=1
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(
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set -x
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make "-j$((NPROCS+1))" -s base >/dev/null && make -s install-base >/dev/null
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)
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cd /opt/src || exit 1
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/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
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if ! /usr/local/sbin/ipsec --version 2>/dev/null | grep -qF "$SWAN_VER"; then
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exiterr "Libreswan $SWAN_VER failed to build."
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fi
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fi
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}
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create_vpn_config() {
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bigecho "Creating VPN configuration..."
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L2TP_NET=${VPN_L2TP_NET:-'192.168.42.0/24'}
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L2TP_LOCAL=${VPN_L2TP_LOCAL:-'192.168.42.1'}
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L2TP_POOL=${VPN_L2TP_POOL:-'192.168.42.10-192.168.42.250'}
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XAUTH_NET=${VPN_XAUTH_NET:-'192.168.43.0/24'}
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XAUTH_POOL=${VPN_XAUTH_POOL:-'192.168.43.10-192.168.43.250'}
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DNS_SRV1=${VPN_DNS_SRV1:-'8.8.8.8'}
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DNS_SRV2=${VPN_DNS_SRV2:-'8.8.4.4'}
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DNS_SRVS="\"$DNS_SRV1 $DNS_SRV2\""
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[ -n "$VPN_DNS_SRV1" ] && [ -z "$VPN_DNS_SRV2" ] && DNS_SRVS="$DNS_SRV1"
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# Create IPsec config
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conf_bk "/etc/ipsec.conf"
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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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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
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uniqueids=no
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conn shared
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left=%defaultroute
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leftid=$public_ip
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right=%any
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encapsulation=yes
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authby=secret
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pfs=no
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rekey=no
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keyingtries=5
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dpddelay=30
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dpdtimeout=120
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dpdaction=clear
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ikev2=never
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ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024
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phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes256-sha2_512,aes128-sha2,aes256-sha2
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ikelifetime=24h
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salifetime=24h
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sha2-truncbug=no
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conn l2tp-psk
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auto=add
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leftprotoport=17/1701
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rightprotoport=17/%any
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type=transport
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also=shared
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conn xauth-psk
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auto=add
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leftsubnet=0.0.0.0/0
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rightaddresspool=$XAUTH_POOL
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modecfgdns=$DNS_SRVS
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leftxauthserver=yes
|
|
rightxauthclient=yes
|
|
leftmodecfgserver=yes
|
|
rightmodecfgclient=yes
|
|
modecfgpull=yes
|
|
cisco-unity=yes
|
|
also=shared
|
|
|
|
include /etc/ipsec.d/*.conf
|
|
EOF
|
|
if uname -m | grep -qi '^arm'; then
|
|
if ! modprobe -q sha512; then
|
|
sed -i '/phase2alg/s/,aes256-sha2_512//' /etc/ipsec.conf
|
|
fi
|
|
fi
|
|
# Specify IPsec PSK
|
|
conf_bk "/etc/ipsec.secrets"
|
|
cat > /etc/ipsec.secrets <<EOF
|
|
%any %any : PSK "$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
|
|
}
|
|
|
|
update_sysctl() {
|
|
bigecho "Updating 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
|
|
|
|
net.ipv4.ip_forward = 1
|
|
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_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
|
|
}
|
|
|
|
update_iptables() {
|
|
bigecho "Updating IPTables rules..."
|
|
IPT_FILE=/etc/iptables.rules
|
|
IPT_FILE2=/etc/iptables/rules.v4
|
|
ipt_flag=0
|
|
if ! grep -qs "hwdsl2 VPN script" "$IPT_FILE"; then
|
|
ipt_flag=1
|
|
fi
|
|
ipi='iptables -I INPUT'
|
|
ipf='iptables -I FORWARD'
|
|
ipp='iptables -t nat -I POSTROUTING'
|
|
res='RELATED,ESTABLISHED'
|
|
if [ "$ipt_flag" = "1" ]; then
|
|
service fail2ban stop >/dev/null 2>&1
|
|
iptables-save > "$IPT_FILE.old-$SYS_DT"
|
|
$ipi 1 -p udp --dport 1701 -m policy --dir in --pol none -j DROP
|
|
$ipi 2 -m conntrack --ctstate INVALID -j DROP
|
|
$ipi 3 -m conntrack --ctstate "$res" -j ACCEPT
|
|
$ipi 4 -p udp -m multiport --dports 500,4500 -j ACCEPT
|
|
$ipi 5 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
|
|
$ipi 6 -p udp --dport 1701 -j DROP
|
|
$ipf 1 -m conntrack --ctstate INVALID -j DROP
|
|
$ipf 2 -i "$NET_IFACE" -o ppp+ -m conntrack --ctstate "$res" -j ACCEPT
|
|
$ipf 3 -i ppp+ -o "$NET_IFACE" -j ACCEPT
|
|
$ipf 4 -i ppp+ -o ppp+ -j ACCEPT
|
|
$ipf 5 -i "$NET_IFACE" -d "$XAUTH_NET" -m conntrack --ctstate "$res" -j ACCEPT
|
|
$ipf 6 -s "$XAUTH_NET" -o "$NET_IFACE" -j ACCEPT
|
|
$ipf 7 -s "$XAUTH_NET" -o ppp+ -j ACCEPT
|
|
iptables -A FORWARD -j DROP
|
|
$ipp -s "$XAUTH_NET" -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE
|
|
$ipp -s "$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" "$IPT_FILE2"
|
|
fi
|
|
fi
|
|
}
|
|
|
|
apply_gcp_mtu_fix() {
|
|
if dmidecode -s system-product-name 2>/dev/null | grep -qi 'Google Compute Engine' \
|
|
&& ifconfig 2>/dev/null | grep "$NET_IFACE" | head -n 1 | grep -qi 'mtu 1460'; then
|
|
bigecho "Applying fix for MTU size..."
|
|
ifconfig "$NET_IFACE" mtu 1500
|
|
dh_file="/etc/dhcp/dhclient.conf"
|
|
if grep -qs "send host-name" "$dh_file" \
|
|
&& ! grep -qs "interface-mtu 1500" "$dh_file"; then
|
|
sed -i".old-$SYS_DT" \
|
|
"/send host-name/a \interface \"$NET_IFACE\" {\ndefault interface-mtu 1500;\nsupersede interface-mtu 1500;\n}" \
|
|
"$dh_file"
|
|
fi
|
|
fi
|
|
}
|
|
|
|
enable_on_boot() {
|
|
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
|
|
}
|
|
|
|
start_services() {
|
|
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
|
|
}
|
|
|
|
show_vpn_info() {
|
|
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: $VPN_PASSWORD
|
|
|
|
Write these down. You'll need them to connect!
|
|
|
|
Important notes: vpnsetup.net/notes
|
|
Setup VPN clients: vpnsetup.net/clients
|
|
IKEv2 guide: vpnsetup.net/ikev2
|
|
|
|
================================================
|
|
|
|
EOF
|
|
if [ ! -e /dev/ppp ]; then
|
|
cat <<'EOF'
|
|
WARNING: /dev/ppp is missing, and IPsec/L2TP mode may not work. Please use
|
|
IKEv2 (vpnsetup.net/ikev2) or IPsec/XAuth mode to connect.
|
|
Debian 11/10 users, see vpnsetup.net/debian10
|
|
|
|
EOF
|
|
fi
|
|
}
|
|
|
|
set_up_ikev2() {
|
|
status=0
|
|
if [ -s /opt/src/ikev2.sh ] && [ ! -f /etc/ipsec.d/ikev2.conf ]; then
|
|
sleep 1
|
|
VPN_DNS_NAME="$VPN_DNS_NAME" VPN_PUBLIC_IP="$public_ip" \
|
|
VPN_CLIENT_NAME="$VPN_CLIENT_NAME" VPN_XAUTH_POOL="$VPN_XAUTH_POOL" \
|
|
VPN_DNS_SRV1="$VPN_DNS_SRV1" VPN_DNS_SRV2="$VPN_DNS_SRV2" \
|
|
VPN_PROTECT_CONFIG="$VPN_PROTECT_CONFIG" \
|
|
/bin/bash /opt/src/ikev2.sh --auto || status=1
|
|
elif [ -s /opt/src/ikev2.sh ]; then
|
|
cat <<'EOF'
|
|
================================================
|
|
|
|
IKEv2 is already set up on this server.
|
|
To manage IKEv2 clients, run: sudo ikev2.sh
|
|
|
|
================================================
|
|
|
|
EOF
|
|
fi
|
|
}
|
|
|
|
vpnsetup() {
|
|
check_root
|
|
check_vz
|
|
check_lxc
|
|
check_os
|
|
check_iface
|
|
check_creds
|
|
check_dns
|
|
check_server_dns
|
|
check_client_name
|
|
check_subnets
|
|
check_iptables
|
|
check_libreswan
|
|
start_setup
|
|
wait_for_apt
|
|
update_apt_cache
|
|
install_setup_pkgs
|
|
detect_ip
|
|
install_vpn_pkgs
|
|
install_fail2ban
|
|
get_helper_scripts
|
|
get_libreswan
|
|
install_libreswan
|
|
create_vpn_config
|
|
update_sysctl
|
|
update_iptables
|
|
apply_gcp_mtu_fix
|
|
enable_on_boot
|
|
start_services
|
|
show_vpn_info
|
|
set_up_ikev2
|
|
}
|
|
|
|
## Defer setup until we have the complete script
|
|
vpnsetup "$@"
|
|
|
|
exit "$status"
|