352 lines
10 KiB
Bash
Executable File
352 lines
10 KiB
Bash
Executable File
#!/bin/bash
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#
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# Script to uninstall IPsec VPN
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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) 2021-2022 Lin Song <linsongui@gmail.com>
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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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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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conf_bk() { /bin/cp -f "$1" "$1.old-$SYS_DT" 2>/dev/null; }
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bigecho() { echo "## $1"; }
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check_cidr() {
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CIDR_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(/(3[0-2]|[1-2][0-9]|[0-9]))$'
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printf '%s' "$1" | tr -d '\n' | grep -Eq "$CIDR_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 $0'"
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fi
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}
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check_os() {
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rh_file="/etc/redhat-release"
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if [ -f "$rh_file" ]; then
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os_type=centos
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if grep -q "Red Hat" "$rh_file"; then
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os_type=rhel
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fi
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[ -f /etc/oracle-release ] && os_type=ol
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grep -qi rocky "$rh_file" && os_type=rocky
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grep -qi alma "$rh_file" && os_type=alma
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if ! grep -q -E "release (7|8|9)" "$rh_file"; then
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exiterr "This script only supports CentOS/RHEL 7-9."
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fi
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elif grep -qs "Amazon Linux release 2" /etc/system-release; then
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os_type=amzn
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else
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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 $os_type in
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[Uu]buntu)
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os_type=ubuntu
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;;
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[Dd]ebian)
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os_type=debian
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;;
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[Rr]aspbian)
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os_type=raspbian
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;;
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[Aa]lpine)
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os_type=alpine
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;;
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*)
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cat 1>&2 <<'EOF'
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Error: This script only supports one of the following OS:
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Ubuntu, Debian, CentOS/RHEL, Rocky Linux, AlmaLinux,
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Oracle Linux, Amazon Linux 2 or Alpine Linux
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EOF
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exit 1
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;;
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esac
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fi
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}
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check_libreswan() {
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ipsec_ver=$(ipsec --version 2>/dev/null)
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if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf \
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|| ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
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exiterr "Cannot remove IPsec VPN because it has not been set up on this server."
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fi
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}
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check_iface() {
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def_iface=$(route 2>/dev/null | grep -m 1 '^default' | grep -o '[^ ]*$')
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if [ "$os_type" != "alpine" ]; then
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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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fi
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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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check_wl=0
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if [ "$os_type" = "ubuntu" ] || [ "$os_type" = "debian" ] || [ "$os_type" = "raspbian" ]; then
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if ! uname -m | grep -qi -e '^arm' -e '^aarch64'; then
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check_wl=1
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fi
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else
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check_wl=1
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fi
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if [ "$check_wl" = "1" ]; 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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abort_and_exit() {
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echo "Abort. No changes were made." >&2
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exit 1
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}
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confirm_or_abort() {
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printf '%s' "$1"
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read -r response
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case $response in
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[yY][eE][sS]|[yY])
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echo
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;;
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*)
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abort_and_exit
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;;
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esac
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}
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confirm_remove() {
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cat <<'EOF'
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WARNING: This script will remove IPsec VPN from this server. All VPN configuration
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will be *permanently deleted*, and Libreswan and xl2tpd will be removed.
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This *cannot* be undone!
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EOF
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confirm_or_abort "Are you sure you want to remove the VPN? [y/N] "
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}
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stop_services() {
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bigecho "Stopping services..."
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service ipsec stop
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service xl2tpd stop
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}
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remove_ipsec() {
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bigecho "Removing IPsec..."
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/bin/rm -rf /usr/local/sbin/ipsec /usr/local/libexec/ipsec /usr/local/share/doc/libreswan
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/bin/rm -f /etc/init/ipsec.conf /lib/systemd/system/ipsec.service /etc/init.d/ipsec \
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/usr/lib/systemd/system/ipsec.service /etc/logrotate.d/libreswan \
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/usr/lib/tmpfiles.d/libreswan.conf
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}
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remove_xl2tpd() {
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bigecho "Removing xl2tpd..."
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if [ "$os_type" = "ubuntu" ] || [ "$os_type" = "debian" ] || [ "$os_type" = "raspbian" ]; then
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export DEBIAN_FRONTEND=noninteractive
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apt-get -yqq purge xl2tpd >/dev/null
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elif [ "$os_type" = "alpine" ]; then
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apk del -q xl2tpd
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else
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yum -y -q remove xl2tpd >/dev/null
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fi
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}
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remove_helper_scripts() {
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bigecho "Removing helper scripts..."
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for sc in ikev2.sh addvpnuser.sh delvpnuser.sh; do
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if [ "$(readlink -f "/usr/bin/$sc" 2>/dev/null)" = "/opt/src/$sc" ]; then
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/bin/rm -f "/usr/bin/$sc" "/opt/src/$sc"
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fi
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done
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}
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update_sysctl() {
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if grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
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bigecho "Updating sysctl settings..."
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conf_bk "/etc/sysctl.conf"
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if [ "$os_type" = "alpine" ]; then
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sed -i '/# Added by hwdsl2 VPN script/,+17d' /etc/sysctl.conf
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else
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sed --follow-symlinks -i '/# Added by hwdsl2 VPN script/,+17d' /etc/sysctl.conf
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fi
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if [ ! -f /usr/bin/wg-quick ] && [ ! -f /usr/sbin/openvpn ]; then
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echo 0 > /proc/sys/net/ipv4/ip_forward
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fi
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echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
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fi
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}
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update_rclocal() {
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if grep -qs "hwdsl2 VPN script" /etc/rc.local; then
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bigecho "Updating rc.local..."
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conf_bk "/etc/rc.local"
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if [ "$os_type" = "alpine" ]; then
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sed -i '/# Added by hwdsl2 VPN script/,+4d' /etc/rc.local
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else
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sed --follow-symlinks -i '/# Added by hwdsl2 VPN script/,+4d' /etc/rc.local
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fi
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fi
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}
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get_vpn_subnets() {
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L2TP_NET=192.168.42.0/24
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XAUTH_NET=192.168.43.0/24
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if [ -s /etc/ipsec.conf ]; then
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if ! grep -q "$L2TP_NET" /etc/ipsec.conf \
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|| ! grep -q "$XAUTH_NET" /etc/ipsec.conf; then
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vipr=$(grep "virtual-private=" /etc/ipsec.conf)
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l2tpnet=$(printf '%s' "$vipr" | cut -f2 -d '!' | sed 's/,%v4://')
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xauthnet=$(printf '%s' "$vipr" | cut -f3 -d '!')
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check_cidr "$l2tpnet" && L2TP_NET="$l2tpnet"
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check_cidr "$xauthnet" && XAUTH_NET="$xauthnet"
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fi
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fi
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}
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update_iptables_rules() {
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use_nft=0
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if [ "$os_type" = "ubuntu" ] || [ "$os_type" = "debian" ] || [ "$os_type" = "raspbian" ] \
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|| [ "$os_type" = "alpine" ]; then
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IPT_FILE=/etc/iptables.rules
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IPT_FILE2=/etc/iptables/rules.v4
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else
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IPT_FILE=/etc/sysconfig/iptables
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if grep -qs "hwdsl2 VPN script" /etc/sysconfig/nftables.conf; then
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use_nft=1
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IPT_FILE=/etc/sysconfig/nftables.conf
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fi
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fi
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ipt_flag=0
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if grep -qs "hwdsl2 VPN script" "$IPT_FILE"; then
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ipt_flag=1
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fi
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ipi='iptables -D INPUT'
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ipf='iptables -D FORWARD'
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ipp='iptables -t nat -D POSTROUTING'
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res='RELATED,ESTABLISHED'
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if [ "$ipt_flag" = "1" ]; then
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if [ "$use_nft" = "0" ]; then
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bigecho "Updating IPTables rules..."
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get_vpn_subnets
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iptables-save > "$IPT_FILE.old-$SYS_DT"
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$ipi -p udp --dport 1701 -m policy --dir in --pol none -j DROP
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$ipi -m conntrack --ctstate INVALID -j DROP
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$ipi -m conntrack --ctstate "$res" -j ACCEPT
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$ipi -p udp -m multiport --dports 500,4500 -j ACCEPT
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$ipi -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
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$ipi -p udp --dport 1701 -j DROP
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$ipf -m conntrack --ctstate INVALID -j DROP
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$ipf -i "$NET_IFACE" -o ppp+ -m conntrack --ctstate "$res" -j ACCEPT
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$ipf -i ppp+ -o "$NET_IFACE" -j ACCEPT
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$ipf -i ppp+ -o ppp+ -j ACCEPT
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$ipf -i "$NET_IFACE" -d "$XAUTH_NET" -m conntrack --ctstate "$res" -j ACCEPT
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$ipf -s "$XAUTH_NET" -o "$NET_IFACE" -j ACCEPT
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$ipf -s "$XAUTH_NET" -o ppp+ -j ACCEPT
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iptables -D FORWARD -j DROP
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$ipp -s "$XAUTH_NET" -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE
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$ipp -s "$L2TP_NET" -o "$NET_IFACE" -j MASQUERADE
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iptables-save > "$IPT_FILE"
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if [ "$os_type" = "ubuntu" ] || [ "$os_type" = "debian" ] || [ "$os_type" = "raspbian" ]; then
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if [ -f "$IPT_FILE2" ]; then
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conf_bk "$IPT_FILE2"
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/bin/cp -f "$IPT_FILE" "$IPT_FILE2"
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fi
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fi
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else
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nft_bk=$(find /etc/sysconfig -maxdepth 1 -name 'nftables.conf.old-*-*-*-*_*_*' -print0 \
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| xargs -r -0 ls -1 -t | head -1)
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diff_count=24
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if grep -qs "release 9" /etc/redhat-release; then
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diff_count=38
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fi
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if [ -f "$nft_bk" ] \
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&& [ "$(diff -y --suppress-common-lines "$IPT_FILE" "$nft_bk" | wc -l)" = "$diff_count" ]; then
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bigecho "Restoring nftables rules..."
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conf_bk "$IPT_FILE"
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/bin/cp -f "$nft_bk" "$IPT_FILE" && /bin/rm -f "$nft_bk"
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nft flush ruleset
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systemctl restart nftables
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else
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cat <<'EOF'
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Note: This script cannot automatically remove nftables rules for the VPN.
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To manually clean them up, edit /etc/sysconfig/nftables.conf
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and remove unneeded rules. Your original rules are backed up as file
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/etc/sysconfig/nftables.conf.old-date-time.
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EOF
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fi
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fi
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fi
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}
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update_crontabs() {
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if [ "$os_type" = "alpine" ]; then
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cron_cmd="rc-service -c ipsec zap start"
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if grep -qs "$cron_cmd" /etc/crontabs/root; then
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bigecho "Updating crontabs..."
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sed -i "/$cron_cmd/d" /etc/crontabs/root
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touch /etc/crontabs/cron.update
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fi
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fi
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}
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remove_config_files() {
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bigecho "Removing VPN configuration..."
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/bin/rm -f /etc/ipsec.conf* /etc/ipsec.secrets* /etc/ppp/chap-secrets* /etc/ppp/options.xl2tpd* \
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/etc/pam.d/pluto /etc/sysconfig/pluto /etc/default/pluto
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/bin/rm -rf /etc/ipsec.d /etc/xl2tpd
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}
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remove_vpn() {
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stop_services
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remove_ipsec
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remove_xl2tpd
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remove_helper_scripts
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update_sysctl
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update_rclocal
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update_iptables_rules
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update_crontabs
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remove_config_files
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}
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print_vpn_removed() {
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echo
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echo "IPsec VPN removed!"
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}
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vpnuninstall() {
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check_root
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check_os
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check_libreswan
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check_iface
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confirm_remove
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remove_vpn
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print_vpn_removed
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}
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## Defer until we have the complete script
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vpnuninstall "$@"
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exit 0
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