2021-08-28 07:35:31 +03:00
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#!/bin/bash
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2016-01-07 19:57:53 +03:00
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#
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2021-09-20 05:51:14 +03:00
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# Script for automatic setup of an IPsec VPN server on CentOS/RHEL,
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# Rocky Linux and AlmaLinux
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2021-01-07 19:32:20 +03:00
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# Works on any dedicated server or virtual private server (VPS)
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2016-01-07 19:57:53 +03:00
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#
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2016-10-11 06:34:51 +03:00
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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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2016-01-07 19:57:53 +03:00
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#
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2022-01-02 09:09:03 +03:00
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# Copyright (C) 2015-2022 Lin Song <linsongui@gmail.com>
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2016-01-07 19:57:53 +03:00
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# Based on the work of Thomas Sarlandie (Copyright 2012)
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#
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2016-04-21 01:31:29 +03:00
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# This work is licensed under the Creative Commons Attribution-ShareAlike 3.0
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2016-01-07 19:57:53 +03:00
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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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2016-04-21 01:31:29 +03:00
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# know how you have improved it!
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2016-01-07 19:57:53 +03:00
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2016-06-21 06:35:45 +03:00
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# =====================================================
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2016-01-22 02:00:51 +03:00
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2016-04-21 01:31:29 +03:00
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# Define your own values for these variables
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2016-06-11 23:36:43 +03:00
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# - IPsec pre-shared key, VPN username and password
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2016-06-02 05:16:15 +03:00
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# - All values MUST be placed inside 'single quotes'
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2017-11-01 09:01:49 +03:00
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# - DO NOT use these special characters within values: \ " '
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2016-01-07 19:57:53 +03:00
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2016-06-11 23:36:43 +03:00
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YOUR_IPSEC_PSK=''
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YOUR_USERNAME=''
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YOUR_PASSWORD=''
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2016-01-21 11:12:30 +03:00
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2016-08-07 22:00:07 +03:00
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# Important notes: https://git.io/vpnnotes
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# Setup VPN clients: https://git.io/vpnclients
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2020-05-11 09:19:03 +03:00
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# IKEv2 guide: https://git.io/ikev2
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2016-01-15 19:01:40 +03:00
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2016-06-21 06:35:45 +03:00
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# =====================================================
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2016-06-08 03:00:33 +03:00
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2016-05-12 00:36:07 +03:00
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export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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2020-06-05 18:56:33 +03:00
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SYS_DT=$(date +%F-%T | tr ':' '_')
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2016-05-12 00:36:07 +03:00
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2016-11-07 04:30:53 +03:00
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exiterr() { echo "Error: $1" >&2; exit 1; }
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2017-11-01 09:01:49 +03:00
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exiterr2() { exiterr "'yum install' failed."; }
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2017-11-02 06:15:56 +03:00
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conf_bk() { /bin/cp -f "$1" "$1.old-$SYS_DT" 2>/dev/null; }
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2021-02-06 06:49:35 +03:00
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bigecho() { echo "## $1"; }
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2016-11-07 04:30:53 +03:00
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2016-09-23 08:39:36 +03:00
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check_ip() {
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2017-10-30 03:53:35 +03:00
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IP_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
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2017-11-01 09:01:49 +03:00
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printf '%s' "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
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2016-09-23 08:39:36 +03:00
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}
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2016-01-21 20:50:35 +03:00
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2021-08-19 10:01:34 +03:00
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check_root() {
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if [ "$(id -u)" != 0 ]; then
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2021-09-07 17:02:22 +03:00
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exiterr "Script must be run as root. Try 'sudo bash $0'"
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2021-08-19 10:01:34 +03:00
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fi
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}
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check_vz() {
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if [ -f /proc/user_beancounters ]; then
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exiterr "OpenVZ VPS is not supported."
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fi
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}
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check_os() {
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os_type=centos
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rh_file="/etc/redhat-release"
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if grep -qs "Red Hat" "$rh_file"; then
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os_type=rhel
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fi
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if grep -qs "release 7" "$rh_file"; then
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os_ver=7
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elif grep -qs "release 8" "$rh_file"; then
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os_ver=8
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grep -qi stream "$rh_file" && os_ver=8s
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grep -qi rocky "$rh_file" && os_type=rocky
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grep -qi alma "$rh_file" && os_type=alma
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else
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2021-09-20 05:51:14 +03:00
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exiterr "This script only supports CentOS/RHEL 7/8, Rocky Linux and AlmaLinux."
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2021-08-19 10:01:34 +03:00
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fi
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}
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check_iface() {
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def_iface=$(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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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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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=$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' </dev/urandom 2>/dev/null | head -c 16)
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fi
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2017-10-30 03:53:35 +03:00
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2021-08-19 10:01:34 +03:00
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if [ -z "$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 $VPN_PASSWORD" in
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*[\\\"\']*)
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exiterr "VPN credentials must not contain these special characters: \\ \" '"
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2018-02-04 01:10:09 +03:00
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;;
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esac
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2021-08-19 10:01:34 +03:00
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}
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check_dns() {
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if { [ -n "$VPN_DNS_SRV1" ] && ! check_ip "$VPN_DNS_SRV1"; } \
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2022-01-29 21:35:51 +03:00
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|| { [ -n "$VPN_DNS_SRV2" ] && ! check_ip "$VPN_DNS_SRV2"; }; then
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2021-08-19 10:01:34 +03:00
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exiterr "The DNS server specified is invalid."
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2017-05-18 01:24:19 +03:00
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fi
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2021-08-19 10:01:34 +03:00
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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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install_setup_pkgs() {
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bigecho "Installing packages required for setup..."
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2021-02-06 06:49:35 +03:00
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(
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set -x
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2021-08-19 10:01:34 +03:00
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yum -y -q install wget bind-utils openssl tar \
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2022-02-09 08:24:46 +03:00
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iptables iproute gawk grep sed net-tools >/dev/null \
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|| yum -y -q install wget bind-utils openssl tar \
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2021-08-19 10:01:34 +03:00
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iptables iproute gawk grep sed net-tools >/dev/null
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2021-02-06 06:49:35 +03:00
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) || exiterr2
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2021-08-19 10:01:34 +03:00
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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 "$public_ip" || exiterr "Cannot detect this server's public IP. Define it as variable 'VPN_PUBLIC_IP' and re-run this script."
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}
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add_epel_repo() {
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bigecho "Adding the EPEL repository..."
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epel_url="https://dl.fedoraproject.org/pub/epel/epel-release-latest-$(rpm -E '%{rhel}').noarch.rpm"
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2021-02-06 06:49:35 +03:00
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(
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set -x
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2021-08-19 10:01:34 +03:00
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yum -y -q install epel-release >/dev/null 2>&1 || yum -y -q install "$epel_url" >/dev/null
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2021-02-06 06:49:35 +03:00
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) || exiterr2
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2021-08-19 10:01:34 +03:00
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}
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install_vpn_pkgs_1() {
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bigecho "Installing packages required for the VPN..."
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erp="--enablerepo"
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rp1="$erp=epel"
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rp2="$erp=*server-*optional*"
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rp3="$erp=*releases-optional*"
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rp4="$erp=[Pp]ower[Tt]ools"
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[ "$os_type" = "rhel" ] && rp4="$erp=codeready-builder-for-rhel-8-*"
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2021-04-02 07:06:36 +03:00
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(
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set -x
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2021-08-19 10:01:34 +03:00
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yum -y -q install nss-devel nspr-devel pkgconfig pam-devel \
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libcap-ng-devel libselinux-devel curl-devel nss-tools \
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flex bison gcc make util-linux ppp >/dev/null
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2021-04-02 07:06:36 +03:00
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) || exiterr2
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2021-08-19 10:01:34 +03:00
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}
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2017-01-09 11:23:09 +03:00
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2021-08-19 10:01:34 +03:00
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install_vpn_pkgs_2() {
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(
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set -x
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yum "$rp1" -y -q install xl2tpd >/dev/null 2>&1
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) || exiterr2
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}
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2021-03-29 07:39:29 +03:00
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2021-08-19 10:01:34 +03:00
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install_vpn_pkgs_3() {
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use_nft=0
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p1=systemd-devel
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p2=libevent-devel
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p3=fipscheck-devel
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p4=iptables-services
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if [ "$os_ver" = "7" ]; then
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(
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set -x
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yum "$rp2" "$rp3" -y -q install $p1 $p2 $p3 $p4 >/dev/null
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) || exiterr2
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else
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(
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set -x
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yum "$rp4" -y -q install $p1 $p2 $p3 >/dev/null
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) || exiterr2
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if systemctl is-active --quiet firewalld \
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|| systemctl is-active --quiet nftables \
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|| grep -qs "hwdsl2 VPN script" /etc/sysconfig/nftables.conf; then
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use_nft=1
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p4=nftables
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fi
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(
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set -x
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yum -y -q install $p4 >/dev/null
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) || exiterr2
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fi
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}
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2021-03-29 07:39:29 +03:00
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2021-08-19 10:01:34 +03:00
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install_fail2ban() {
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bigecho "Installing Fail2Ban to protect SSH..."
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(
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set -x
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yum "$rp1" -y -q install fail2ban >/dev/null
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) || exiterr2
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}
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2017-01-09 11:23:09 +03:00
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2022-01-23 06:31:55 +03:00
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get_swan_ver() {
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SWAN_VER=4.6
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2022-01-29 10:28:56 +03:00
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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- "$swan_ver_url" | head -n 1)
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2022-01-23 06:31:55 +03:00
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if printf '%s' "$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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2021-08-19 10:01:34 +03:00
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}
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2021-02-06 06:49:35 +03:00
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2021-08-29 23:12:17 +03:00
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check_libreswan() {
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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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[ "$swan_ver_old" = "$SWAN_VER" ]
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}
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get_libreswan() {
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if ! check_libreswan; then
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bigecho "Downloading Libreswan..."
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2022-01-23 06:34:53 +03:00
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cd /opt/src || exit 1
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2021-08-29 23:12:17 +03:00
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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 $SWAN_VER is already installed, skipping..."
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fi
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2021-08-19 10:01:34 +03:00
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}
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2021-02-06 06:49:35 +03:00
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2021-08-19 10:01:34 +03:00
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install_libreswan() {
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2021-08-29 23:12:17 +03:00
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if ! check_libreswan; then
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bigecho "Compiling and installing Libreswan, please wait..."
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cd "libreswan-$SWAN_VER" || exit 1
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2017-08-20 18:52:28 +03:00
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cat > Makefile.inc.local <<'EOF'
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2021-07-10 09:57:11 +03:00
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WERROR_CFLAGS=-w -s
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2020-11-11 09:27:44 +03:00
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|
USE_DNSSEC=false
|
|
|
|
USE_DH2=true
|
|
|
|
USE_NSS_KDF=false
|
|
|
|
FINALNSSDIR=/etc/ipsec.d
|
2017-08-20 18:52:28 +03:00
|
|
|
EOF
|
2021-08-29 23:12:17 +03:00
|
|
|
if ! grep -qs IFLA_XFRM_LINK /usr/include/linux/if_link.h; then
|
|
|
|
echo "USE_XFRM_INTERFACE_IFLA_HEADER=true" >> Makefile.inc.local
|
|
|
|
fi
|
|
|
|
NPROCS=$(grep -c ^processor /proc/cpuinfo)
|
|
|
|
[ -z "$NPROCS" ] && NPROCS=1
|
|
|
|
(
|
|
|
|
set -x
|
|
|
|
make "-j$((NPROCS+1))" -s base >/dev/null && make -s install-base >/dev/null
|
|
|
|
)
|
2021-08-19 10:01:34 +03:00
|
|
|
|
2021-08-29 23:12:17 +03:00
|
|
|
cd /opt/src || exit 1
|
|
|
|
/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
|
|
|
|
if ! /usr/local/sbin/ipsec --version 2>/dev/null | grep -qF "$SWAN_VER"; then
|
|
|
|
exiterr "Libreswan $SWAN_VER failed to build."
|
|
|
|
fi
|
2021-08-19 10:01:34 +03:00
|
|
|
fi
|
|
|
|
}
|
|
|
|
|
2022-01-23 06:31:55 +03:00
|
|
|
get_ikev2_script() {
|
|
|
|
bigecho "Downloading IKEv2 script..."
|
2022-01-23 06:34:53 +03:00
|
|
|
cd /opt/src || exit 1
|
2022-01-23 06:31:55 +03:00
|
|
|
ikev2_url="https://github.com/hwdsl2/setup-ipsec-vpn/raw/master/extras/ikev2setup.sh"
|
|
|
|
(
|
|
|
|
set -x
|
|
|
|
wget -t 3 -T 30 -q -O ikev2.sh "$ikev2_url"
|
|
|
|
) || /bin/rm -f ikev2.sh
|
|
|
|
[ -s ikev2.sh ] && chmod +x ikev2.sh && ln -s /opt/src/ikev2.sh /usr/bin 2>/dev/null
|
|
|
|
}
|
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
create_vpn_config() {
|
|
|
|
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"
|
2016-01-07 19:57:53 +03:00
|
|
|
cat > /etc/ipsec.conf <<EOF
|
|
|
|
version 2.0
|
|
|
|
|
|
|
|
config setup
|
2017-09-28 05:41:24 +03:00
|
|
|
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
|
2016-05-16 21:56:05 +03:00
|
|
|
uniqueids=no
|
2016-01-07 19:57:53 +03:00
|
|
|
|
2016-05-16 21:56:05 +03:00
|
|
|
conn shared
|
2017-02-11 03:00:29 +03:00
|
|
|
left=%defaultroute
|
2021-05-11 17:59:18 +03:00
|
|
|
leftid=$public_ip
|
2016-01-07 19:57:53 +03:00
|
|
|
right=%any
|
2017-01-16 21:30:37 +03:00
|
|
|
encapsulation=yes
|
2016-01-07 19:57:53 +03:00
|
|
|
authby=secret
|
|
|
|
pfs=no
|
|
|
|
rekey=no
|
|
|
|
keyingtries=5
|
|
|
|
dpddelay=30
|
|
|
|
dpdtimeout=120
|
|
|
|
dpdaction=clear
|
2019-06-09 08:15:11 +03:00
|
|
|
ikev2=never
|
2018-10-27 08:49:41 +03:00
|
|
|
ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024
|
2018-11-24 19:30:42 +03:00
|
|
|
phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes256-sha2_512,aes128-sha2,aes256-sha2
|
2021-01-22 08:24:41 +03:00
|
|
|
ikelifetime=24h
|
|
|
|
salifetime=24h
|
2019-09-23 06:37:23 +03:00
|
|
|
sha2-truncbug=no
|
2016-05-16 21:56:05 +03:00
|
|
|
|
|
|
|
conn l2tp-psk
|
|
|
|
auto=add
|
|
|
|
leftprotoport=17/1701
|
|
|
|
rightprotoport=17/%any
|
|
|
|
type=transport
|
|
|
|
also=shared
|
|
|
|
|
|
|
|
conn xauth-psk
|
|
|
|
auto=add
|
|
|
|
leftsubnet=0.0.0.0/0
|
2017-02-12 06:36:37 +03:00
|
|
|
rightaddresspool=$XAUTH_POOL
|
2018-12-17 09:07:04 +03:00
|
|
|
modecfgdns=$DNS_SRVS
|
2016-05-16 21:56:05 +03:00
|
|
|
leftxauthserver=yes
|
|
|
|
rightxauthclient=yes
|
|
|
|
leftmodecfgserver=yes
|
|
|
|
rightmodecfgclient=yes
|
|
|
|
modecfgpull=yes
|
|
|
|
cisco-unity=yes
|
|
|
|
also=shared
|
2020-05-31 07:09:32 +03:00
|
|
|
|
|
|
|
include /etc/ipsec.d/*.conf
|
2016-01-07 19:57:53 +03:00
|
|
|
EOF
|
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
# Specify IPsec PSK
|
|
|
|
conf_bk "/etc/ipsec.secrets"
|
2016-01-07 19:57:53 +03:00
|
|
|
cat > /etc/ipsec.secrets <<EOF
|
2017-02-11 03:00:29 +03:00
|
|
|
%any %any : PSK "$VPN_IPSEC_PSK"
|
2016-01-07 19:57:53 +03:00
|
|
|
EOF
|
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
# Create xl2tpd config
|
|
|
|
conf_bk "/etc/xl2tpd/xl2tpd.conf"
|
2017-02-12 06:36:37 +03:00
|
|
|
cat > /etc/xl2tpd/xl2tpd.conf <<EOF
|
2016-01-07 19:57:53 +03:00
|
|
|
[global]
|
|
|
|
port = 1701
|
|
|
|
|
|
|
|
[lns default]
|
2017-02-12 06:36:37 +03:00
|
|
|
ip range = $L2TP_POOL
|
|
|
|
local ip = $L2TP_LOCAL
|
2016-01-07 19:57:53 +03:00
|
|
|
require chap = yes
|
|
|
|
refuse pap = yes
|
|
|
|
require authentication = yes
|
|
|
|
name = l2tpd
|
|
|
|
pppoptfile = /etc/ppp/options.xl2tpd
|
|
|
|
length bit = yes
|
|
|
|
EOF
|
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
# Set xl2tpd options
|
|
|
|
conf_bk "/etc/ppp/options.xl2tpd"
|
2017-02-12 06:36:37 +03:00
|
|
|
cat > /etc/ppp/options.xl2tpd <<EOF
|
2017-09-25 08:28:10 +03:00
|
|
|
+mschap-v2
|
2016-01-07 19:57:53 +03:00
|
|
|
ipcp-accept-local
|
|
|
|
ipcp-accept-remote
|
|
|
|
noccp
|
|
|
|
auth
|
|
|
|
mtu 1280
|
|
|
|
mru 1280
|
2016-06-11 03:34:59 +03:00
|
|
|
proxyarp
|
|
|
|
lcp-echo-failure 4
|
|
|
|
lcp-echo-interval 30
|
2016-01-07 19:57:53 +03:00
|
|
|
connect-delay 5000
|
2018-12-17 09:07:04 +03:00
|
|
|
ms-dns $DNS_SRV1
|
2016-01-07 19:57:53 +03:00
|
|
|
EOF
|
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
if [ -z "$VPN_DNS_SRV1" ] || [ -n "$VPN_DNS_SRV2" ]; then
|
2018-12-17 09:07:04 +03:00
|
|
|
cat >> /etc/ppp/options.xl2tpd <<EOF
|
|
|
|
ms-dns $DNS_SRV2
|
|
|
|
EOF
|
2021-08-19 10:01:34 +03:00
|
|
|
fi
|
2018-12-17 09:07:04 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
# Create VPN credentials
|
|
|
|
conf_bk "/etc/ppp/chap-secrets"
|
2016-01-07 19:57:53 +03:00
|
|
|
cat > /etc/ppp/chap-secrets <<EOF
|
2016-01-15 00:05:50 +03:00
|
|
|
"$VPN_USER" l2tpd "$VPN_PASSWORD" *
|
2016-01-07 19:57:53 +03:00
|
|
|
EOF
|
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
conf_bk "/etc/ipsec.d/passwd"
|
|
|
|
VPN_PASSWORD_ENC=$(openssl passwd -1 "$VPN_PASSWORD")
|
2016-07-04 01:54:15 +03:00
|
|
|
cat > /etc/ipsec.d/passwd <<EOF
|
|
|
|
$VPN_USER:$VPN_PASSWORD_ENC:xauth-psk
|
|
|
|
EOF
|
2021-08-19 10:01:34 +03:00
|
|
|
}
|
2016-05-16 21:56:05 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
create_f2b_config() {
|
|
|
|
F2B_FILE=/etc/fail2ban/jail.local
|
|
|
|
if [ ! -f "$F2B_FILE" ]; then
|
|
|
|
bigecho "Creating basic Fail2Ban rules..."
|
|
|
|
cat > "$F2B_FILE" <<'EOF'
|
|
|
|
[ssh-iptables]
|
|
|
|
enabled = true
|
|
|
|
filter = sshd
|
|
|
|
logpath = /var/log/secure
|
|
|
|
EOF
|
|
|
|
|
|
|
|
if [ "$use_nft" = "1" ]; then
|
|
|
|
cat >> "$F2B_FILE" <<'EOF'
|
|
|
|
port = ssh
|
|
|
|
banaction = nftables-multiport[blocktype=drop]
|
|
|
|
EOF
|
|
|
|
else
|
|
|
|
cat >> "$F2B_FILE" <<'EOF'
|
|
|
|
action = iptables[name=SSH, port=ssh, protocol=tcp]
|
|
|
|
EOF
|
|
|
|
fi
|
|
|
|
fi
|
|
|
|
}
|
2017-01-09 11:23:09 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
update_sysctl() {
|
|
|
|
bigecho "Updating sysctl settings..."
|
|
|
|
if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
|
|
|
|
conf_bk "/etc/sysctl.conf"
|
2016-10-10 10:55:01 +03:00
|
|
|
cat >> /etc/sysctl.conf <<EOF
|
2016-01-17 09:41:12 +03:00
|
|
|
|
|
|
|
# Added by hwdsl2 VPN script
|
2016-01-07 19:57:53 +03:00
|
|
|
kernel.msgmnb = 65536
|
|
|
|
kernel.msgmax = 65536
|
2016-01-17 21:17:26 +03:00
|
|
|
|
2016-01-07 19:57:53 +03:00
|
|
|
net.ipv4.ip_forward = 1
|
|
|
|
net.ipv4.conf.all.accept_redirects = 0
|
|
|
|
net.ipv4.conf.all.send_redirects = 0
|
|
|
|
net.ipv4.conf.all.rp_filter = 0
|
2017-10-28 23:40:24 +03:00
|
|
|
net.ipv4.conf.default.accept_redirects = 0
|
|
|
|
net.ipv4.conf.default.send_redirects = 0
|
2016-01-07 19:57:53 +03:00
|
|
|
net.ipv4.conf.default.rp_filter = 0
|
2018-09-18 08:57:03 +03:00
|
|
|
net.ipv4.conf.$NET_IFACE.send_redirects = 0
|
|
|
|
net.ipv4.conf.$NET_IFACE.rp_filter = 0
|
2016-01-17 21:17:26 +03:00
|
|
|
|
|
|
|
net.core.wmem_max = 12582912
|
|
|
|
net.core.rmem_max = 12582912
|
|
|
|
net.ipv4.tcp_rmem = 10240 87380 12582912
|
|
|
|
net.ipv4.tcp_wmem = 10240 87380 12582912
|
2020-07-03 01:52:13 +03:00
|
|
|
EOF
|
|
|
|
fi
|
2021-08-19 10:01:34 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
update_iptables() {
|
|
|
|
bigecho "Updating IPTables rules..."
|
|
|
|
IPT_FILE=/etc/sysconfig/iptables
|
|
|
|
[ "$use_nft" = "1" ] && IPT_FILE=/etc/sysconfig/nftables.conf
|
|
|
|
ipt_flag=0
|
|
|
|
if ! grep -qs "hwdsl2 VPN script" "$IPT_FILE"; then
|
|
|
|
ipt_flag=1
|
2020-05-24 07:38:37 +03:00
|
|
|
fi
|
2021-08-19 10:01:34 +03:00
|
|
|
|
|
|
|
ipi='iptables -I INPUT'
|
|
|
|
ipf='iptables -I FORWARD'
|
|
|
|
ipp='iptables -t nat -I POSTROUTING'
|
|
|
|
res='RELATED,ESTABLISHED'
|
|
|
|
nff='nft insert rule inet firewalld'
|
|
|
|
nfn='nft insert rule inet nftables_svc'
|
|
|
|
if [ "$ipt_flag" = "1" ]; then
|
|
|
|
service fail2ban stop >/dev/null 2>&1
|
|
|
|
if [ "$use_nft" = "1" ]; then
|
|
|
|
nft list ruleset > "$IPT_FILE.old-$SYS_DT"
|
|
|
|
chmod 600 "$IPT_FILE.old-$SYS_DT"
|
|
|
|
else
|
|
|
|
iptables-save > "$IPT_FILE.old-$SYS_DT"
|
|
|
|
fi
|
|
|
|
$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"
|
|
|
|
if [ "$use_nft" = "1" ]; then
|
|
|
|
for vport in 500 4500 1701; do
|
|
|
|
$nff filter_INPUT udp dport "$vport" accept 2>/dev/null
|
|
|
|
$nfn allow udp dport "$vport" accept 2>/dev/null
|
2020-05-24 07:38:37 +03:00
|
|
|
done
|
2021-08-19 10:01:34 +03:00
|
|
|
for vnet in "$L2TP_NET" "$XAUTH_NET"; do
|
|
|
|
for vdir in saddr daddr; do
|
|
|
|
$nff filter_FORWARD ip "$vdir" "$vnet" accept 2>/dev/null
|
|
|
|
$nfn FORWARD ip "$vdir" "$vnet" accept 2>/dev/null
|
|
|
|
done
|
|
|
|
done
|
|
|
|
echo "flush ruleset" >> "$IPT_FILE"
|
|
|
|
nft list ruleset >> "$IPT_FILE"
|
|
|
|
else
|
|
|
|
iptables-save >> "$IPT_FILE"
|
|
|
|
fi
|
2020-05-24 07:38:37 +03:00
|
|
|
fi
|
2021-08-19 10:01:34 +03:00
|
|
|
}
|
2018-10-21 08:20:54 +03:00
|
|
|
|
2022-02-23 09:07:33 +03:00
|
|
|
apply_gcp_mtu_fix() {
|
2022-02-24 18:18:39 +03:00
|
|
|
if dmidecode -s system-product-name 2>/dev/null | grep -qi 'Google Compute Engine' \
|
|
|
|
&& ifconfig 2>/dev/null | grep "$NET_IFACE" | head -n 1 | grep -qi 'mtu 1460'; then
|
2022-02-23 09:07:33 +03:00
|
|
|
bigecho "Applying fix for MTU size..."
|
|
|
|
ifconfig "$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}" \
|
|
|
|
"$dh_file"
|
|
|
|
fi
|
|
|
|
fi
|
|
|
|
}
|
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
enable_on_boot() {
|
|
|
|
bigecho "Enabling services on boot..."
|
|
|
|
systemctl --now mask firewalld 2>/dev/null
|
|
|
|
if [ "$use_nft" = "1" ]; then
|
|
|
|
systemctl enable nftables fail2ban 2>/dev/null
|
2017-01-04 10:50:41 +03:00
|
|
|
else
|
2021-08-19 10:01:34 +03:00
|
|
|
systemctl enable iptables fail2ban 2>/dev/null
|
2017-01-04 10:50:41 +03:00
|
|
|
fi
|
2021-08-19 10:01:34 +03:00
|
|
|
|
|
|
|
if ! grep -qs "hwdsl2 VPN script" /etc/rc.local; then
|
|
|
|
if [ -f /etc/rc.local ]; then
|
|
|
|
conf_bk "/etc/rc.local"
|
|
|
|
else
|
|
|
|
echo '#!/bin/sh' > /etc/rc.local
|
|
|
|
fi
|
2016-07-04 01:54:15 +03:00
|
|
|
cat >> /etc/rc.local <<'EOF'
|
2016-01-07 19:57:53 +03:00
|
|
|
|
2016-01-17 09:41:12 +03:00
|
|
|
# Added by hwdsl2 VPN script
|
2017-06-21 08:02:03 +03:00
|
|
|
(sleep 15
|
2017-01-04 10:50:41 +03:00
|
|
|
service ipsec restart
|
|
|
|
service xl2tpd restart
|
2017-06-21 08:02:03 +03:00
|
|
|
echo 1 > /proc/sys/net/ipv4/ip_forward)&
|
2016-01-07 19:57:53 +03:00
|
|
|
EOF
|
2021-08-19 10:01:34 +03:00
|
|
|
fi
|
|
|
|
}
|
2016-01-18 00:39:08 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
start_services() {
|
|
|
|
bigecho "Starting services..."
|
|
|
|
sysctl -e -q -p
|
2016-01-17 21:17:26 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
chmod +x /etc/rc.local
|
|
|
|
chmod 600 /etc/ipsec.secrets* /etc/ppp/chap-secrets* /etc/ipsec.d/passwd*
|
2016-01-07 19:57:53 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
restorecon /etc/ipsec.d/*db 2>/dev/null
|
|
|
|
restorecon /usr/local/sbin -Rv 2>/dev/null
|
|
|
|
restorecon /usr/local/libexec/ipsec -Rv 2>/dev/null
|
2017-02-16 21:28:57 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
if [ "$use_nft" = "1" ]; then
|
|
|
|
nft -f "$IPT_FILE"
|
|
|
|
else
|
|
|
|
iptables-restore < "$IPT_FILE"
|
|
|
|
fi
|
2016-01-30 22:12:15 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
# Fix xl2tpd if l2tp_ppp is unavailable
|
|
|
|
if ! modprobe -q l2tp_ppp; then
|
|
|
|
sed -i '/^ExecStartPre=\//s/=/=-/' /usr/lib/systemd/system/xl2tpd.service
|
|
|
|
systemctl daemon-reload
|
|
|
|
fi
|
2021-01-03 23:05:13 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
mkdir -p /run/pluto
|
|
|
|
service fail2ban restart 2>/dev/null
|
|
|
|
service ipsec restart 2>/dev/null
|
|
|
|
service xl2tpd restart 2>/dev/null
|
|
|
|
}
|
2021-01-03 23:05:13 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
show_vpn_info() {
|
2016-05-21 11:59:08 +03:00
|
|
|
cat <<EOF
|
|
|
|
|
|
|
|
================================================
|
|
|
|
|
2016-05-26 22:31:11 +03:00
|
|
|
IPsec VPN server is now ready for use!
|
2016-05-21 11:59:08 +03:00
|
|
|
|
|
|
|
Connect to your new VPN with these details:
|
|
|
|
|
2021-05-11 17:59:18 +03:00
|
|
|
Server IP: $public_ip
|
2016-05-21 11:59:08 +03:00
|
|
|
IPsec PSK: $VPN_IPSEC_PSK
|
|
|
|
Username: $VPN_USER
|
|
|
|
Password: $VPN_PASSWORD
|
|
|
|
|
|
|
|
Write these down. You'll need them to connect!
|
|
|
|
|
2016-08-07 22:00:07 +03:00
|
|
|
Important notes: https://git.io/vpnnotes
|
|
|
|
Setup VPN clients: https://git.io/vpnclients
|
2020-05-11 09:19:03 +03:00
|
|
|
IKEv2 guide: https://git.io/ikev2
|
2016-05-21 11:59:08 +03:00
|
|
|
|
|
|
|
================================================
|
|
|
|
|
|
|
|
EOF
|
2021-08-19 10:01:34 +03:00
|
|
|
}
|
2016-04-18 00:55:44 +03:00
|
|
|
|
2021-08-19 10:01:34 +03:00
|
|
|
vpnsetup() {
|
|
|
|
check_root
|
|
|
|
check_vz
|
|
|
|
check_os
|
|
|
|
check_iface
|
|
|
|
check_creds
|
|
|
|
check_dns
|
|
|
|
start_setup
|
|
|
|
install_setup_pkgs
|
|
|
|
detect_ip
|
|
|
|
add_epel_repo
|
|
|
|
install_vpn_pkgs_1
|
|
|
|
install_vpn_pkgs_2
|
|
|
|
install_vpn_pkgs_3
|
|
|
|
install_fail2ban
|
2022-02-23 09:08:45 +03:00
|
|
|
get_ikev2_script
|
2022-01-23 06:31:55 +03:00
|
|
|
get_swan_ver
|
2021-08-19 10:01:34 +03:00
|
|
|
get_libreswan
|
|
|
|
install_libreswan
|
|
|
|
create_vpn_config
|
|
|
|
create_f2b_config
|
|
|
|
update_sysctl
|
|
|
|
update_iptables
|
2022-02-23 09:07:33 +03:00
|
|
|
apply_gcp_mtu_fix
|
2021-08-19 10:01:34 +03:00
|
|
|
enable_on_boot
|
|
|
|
start_services
|
|
|
|
show_vpn_info
|
2017-10-30 03:53:35 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
## Defer setup until we have the complete script
|
|
|
|
vpnsetup "$@"
|
|
|
|
|
2016-05-21 11:59:08 +03:00
|
|
|
exit 0
|