452 lines
14 KiB
Bash
452 lines
14 KiB
Bash
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#!/usr/local/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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#
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set -e -o pipefail
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shopt -s extglob
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export LC_ALL=C
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SELF="$(readlink -f "${BASH_SOURCE[0]}")"
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export PATH="${SELF%/*}:$PATH"
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WG_CONFIG=""
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INTERFACE=""
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ADDRESSES=( )
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MTU=""
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DNS=( )
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TABLE=""
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PRE_UP=( )
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POST_UP=( )
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PRE_DOWN=( )
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POST_DOWN=( )
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SAVE_CONFIG=0
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CONFIG_FILE=""
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PROGRAM="${0##*/}"
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ARGS=( "$@" )
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cmd() {
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echo "[#] $*" >&2
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"$@"
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}
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die() {
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echo "$PROGRAM: $*" >&2
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exit 1
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}
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parse_options() {
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local interface_section=0 line key value stripped
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CONFIG_FILE="$1"
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[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,15}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf"
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[[ -e $CONFIG_FILE ]] || die "\`$CONFIG_FILE' does not exist"
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[[ $CONFIG_FILE =~ (^|/)([a-zA-Z0-9_=+.-]{1,15})\.conf$ ]] || die "The config file must be a valid interface name, followed by .conf"
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CONFIG_FILE="$(readlink -f "$CONFIG_FILE")"
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((($(stat -f '0%#p' "$CONFIG_FILE") & $(stat -f '0%#p' "${CONFIG_FILE%/*}") & 0007) == 0)) || echo "Warning: \`$CONFIG_FILE' is world accessible" >&2
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INTERFACE="${BASH_REMATCH[2]}"
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shopt -s nocasematch
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while read -r line || [[ -n $line ]]; do
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stripped="${line%%\#*}"
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key="${stripped%%=*}"; key="${key##*([[:space:]])}"; key="${key%%*([[:space:]])}"
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value="${stripped#*=}"; value="${value##*([[:space:]])}"; value="${value%%*([[:space:]])}"
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[[ $key == "["* ]] && interface_section=0
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[[ $key == "[Interface]" ]] && interface_section=1
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if [[ $interface_section -eq 1 ]]; then
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case "$key" in
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Address) ADDRESSES+=( ${value//,/ } ); continue ;;
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MTU) MTU="$value"; continue ;;
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DNS) DNS+=( ${value//,/ } ); continue ;;
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Table) TABLE="$value"; continue ;;
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PreUp) PRE_UP+=( "$value" ); continue ;;
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PreDown) PRE_DOWN+=( "$value" ); continue ;;
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PostUp) POST_UP+=( "$value" ); continue ;;
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PostDown) POST_DOWN+=( "$value" ); continue ;;
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SaveConfig) read_bool SAVE_CONFIG "$value"; continue ;;
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esac
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fi
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WG_CONFIG+="$line"$'\n'
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done < "$CONFIG_FILE"
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shopt -u nocasematch
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}
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read_bool() {
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case "$2" in
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true) printf -v "$1" 1 ;;
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false) printf -v "$1" 0 ;;
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*) die "\`$2' is neither true nor false"
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esac
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}
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auto_su() {
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[[ $UID == 0 ]] || exec doas -- "$BASH" -- "$SELF" "${ARGS[@]}"
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}
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get_real_interface() {
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local interface diff
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wg show interfaces >/dev/null
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[[ -f "/var/run/wireguard/$INTERFACE.name" ]] || return 1
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interface="$(< "/var/run/wireguard/$INTERFACE.name")"
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[[ -n $interface && -S "/var/run/wireguard/$interface.sock" ]] || return 1
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diff=$(( $(stat -f %m "/var/run/wireguard/$interface.sock" 2>/dev/null || echo 200) - $(stat -f %m "/var/run/wireguard/$INTERFACE.name" 2>/dev/null || echo 100) ))
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[[ $diff -ge 2 || $diff -le -2 ]] && return 1
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REAL_INTERFACE="$interface"
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echo "[+] Interface for $INTERFACE is $REAL_INTERFACE" >&2
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return 0
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}
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add_if() {
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export WG_TUN_NAME_FILE="/var/run/wireguard/$INTERFACE.name"
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mkdir -m 0700 -p "/var/run/wireguard/"
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cmd "${WG_QUICK_USERSPACE_IMPLEMENTATION:-wireguard-go}" tun
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get_real_interface
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}
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del_routes() {
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local todelete=( ) destination gateway netif
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[[ -n $REAL_INTERFACE ]] || return 0
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while read -r destination _ _ _ _ netif _; do
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[[ $netif == "$REAL_INTERFACE" ]] && todelete+=( "$destination" )
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done < <(netstat -nr -f inet)
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for destination in "${todelete[@]}"; do
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cmd route -q -n delete -inet "$destination" || true
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done
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todelete=( )
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while read -r destination gateway _ netif; do
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[[ $netif == "$REAL_INTERFACE" || ( $netif == lo* && $gateway == "$REAL_INTERFACE" ) ]] && todelete+=( "$destination" )
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done < <(netstat -nr -f inet6)
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for destination in "${todelete[@]}"; do
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cmd route -q -n delete -inet6 "$destination" || true
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done
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for destination in "${ENDPOINTS[@]}"; do
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if [[ $destination == *:* ]]; then
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cmd route -q -n delete -inet6 "$destination" || true
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else
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cmd route -q -n delete -inet "$destination" || true
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fi
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done
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}
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del_if() {
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unset_dns
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[[ -z $REAL_INTERFACE ]] || cmd rm -f "/var/run/wireguard/$REAL_INTERFACE.sock"
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cmd rm -f "/var/run/wireguard/$INTERFACE.name"
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}
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up_if() {
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cmd ifconfig "$REAL_INTERFACE" up
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}
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add_addr() {
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local family
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if [[ $1 == *:* ]]; then
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family=inet6
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[[ -n $FIRSTADDR6 ]] || FIRSTADDR6="${1%/*}"
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else
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family=inet
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[[ -n $FIRSTADDR4 ]] || FIRSTADDR4="${1%/*}"
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fi
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cmd ifconfig "$REAL_INTERFACE" $family "$1" alias
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}
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set_mtu() {
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local mtu=0 endpoint output family
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if [[ -n $MTU ]]; then
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cmd ifconfig "$REAL_INTERFACE" mtu "$MTU"
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return
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fi
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while read -r _ endpoint; do
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[[ $endpoint =~ ^\[?([a-z0-9:.]+)\]?:[0-9]+$ ]] || continue
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family=inet
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[[ ${BASH_REMATCH[1]} == *:* ]] && family=inet6
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output="$(route -n get "-$family" "${BASH_REMATCH[1]}" || true)"
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[[ $output =~ interface:\ ([^ ]+)$'\n' && $(ifconfig "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}"
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done < <(wg show "$REAL_INTERFACE" endpoints)
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if [[ $mtu -eq 0 ]]; then
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read -r output < <(route -n get default || true) || true
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[[ $output =~ interface:\ ([^ ]+)$'\n' && $(ifconfig "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}"
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fi
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[[ $mtu -gt 0 ]] || mtu=1500
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cmd ifconfig "$REAL_INTERFACE" mtu $(( mtu - 80 ))
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}
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collect_gateways() {
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local destination gateway
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GATEWAY4=""
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while read -r destination gateway _; do
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[[ $destination == default ]] || continue
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GATEWAY4="$gateway"
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break
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done < <(netstat -nr -f inet)
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GATEWAY6=""
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while read -r destination gateway _; do
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[[ $destination == default ]] || continue
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[[ $gateway == fe80:* ]] && continue
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GATEWAY6="$gateway"
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break
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done < <(netstat -nr -f inet6)
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}
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collect_endpoints() {
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ENDPOINTS=( )
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while read -r _ endpoint; do
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[[ $endpoint =~ ^\[?([a-z0-9:.]+)\]?:[0-9]+$ ]] || continue
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ENDPOINTS+=( "${BASH_REMATCH[1]}" )
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done < <(wg show "$REAL_INTERFACE" endpoints)
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}
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set_endpoint_direct_route() {
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local old_endpoints endpoint old_gateway4 old_gateway6 remove_all_old=0 added=( )
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old_endpoints=( "${ENDPOINTS[@]}" )
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old_gateway4="$GATEWAY4"
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old_gateway6="$GATEWAY6"
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collect_gateways
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collect_endpoints
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[[ $old_gateway4 != "$GATEWAY4" || $old_gateway6 != "$GATEWAY6" ]] && remove_all_old=1
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if [[ $remove_all_old -eq 1 ]]; then
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for endpoint in "${ENDPOINTS[@]}"; do
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[[ " ${old_endpoints[*]} " == *" $endpoint "* ]] || old_endpoints+=( "$endpoint" )
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done
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fi
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for endpoint in "${old_endpoints[@]}"; do
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[[ $remove_all_old -eq 0 && " ${ENDPOINTS[*]} " == *" $endpoint "* ]] && continue
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if [[ $endpoint == *:* && $AUTO_ROUTE6 -eq 1 ]]; then
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cmd route -q -n delete -inet6 "$endpoint" 2>/dev/null || true
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elif [[ $AUTO_ROUTE4 -eq 1 ]]; then
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cmd route -q -n delete -inet "$endpoint" 2>/dev/null || true
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fi
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done
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for endpoint in "${ENDPOINTS[@]}"; do
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if [[ $remove_all_old -eq 0 && " ${old_endpoints[*]} " == *" $endpoint "* ]]; then
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added+=( "$endpoint" )
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continue
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fi
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if [[ $endpoint == *:* && $AUTO_ROUTE6 -eq 1 ]]; then
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if [[ -n $GATEWAY6 ]]; then
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cmd route -q -n add -inet6 "$endpoint" -gateway "$GATEWAY6" || true
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else
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# Prevent routing loop
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cmd route -q -n add -inet6 "$endpoint" ::1 -blackhole || true
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fi
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added+=( "$endpoint" )
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elif [[ $AUTO_ROUTE4 -eq 1 ]]; then
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if [[ -n $GATEWAY4 ]]; then
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cmd route -q -n add -inet "$endpoint" -gateway "$GATEWAY4" || true
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else
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# Prevent routing loop
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cmd route -q -n add -inet "$endpoint" 127.0.0.1 -blackhole || true
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fi
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added+=( "$endpoint" )
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fi
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done
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ENDPOINTS=( "${added[@]}" )
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}
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monitor_daemon() {
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echo "[+] Backgrounding route monitor" >&2
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(trap 'del_routes; exit 0' INT TERM EXIT
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exec >/dev/null 2>&1
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local event
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# TODO: this should also check to see if the endpoint actually changes
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# in response to incoming packets, and then call set_endpoint_direct_route
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# then too. That function should be able to gracefully cleanup if the
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# endpoints change.
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while read -r event; do
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[[ $event == RTM_* ]] || continue
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ifconfig "$REAL_INTERFACE" >/dev/null 2>&1 || break
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[[ $AUTO_ROUTE4 -eq 1 || $AUTO_ROUTE6 -eq 1 ]] && set_endpoint_direct_route
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# TODO: set the mtu as well, but only if up
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done < <(route -n monitor)) & disown
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}
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set_dns() {
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[[ ${#DNS[@]} -gt 0 ]] || return 0
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# TODO: this is a horrible way of doing it. Has OpenBSD no resolvconf?
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cmd cp /etc/resolv.conf "/etc/resolv.conf.wg-quick-backup.$INTERFACE"
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cmd printf 'nameserver %s\n' "${DNS[@]}" > /etc/resolv.conf
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}
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unset_dns() {
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[[ -f "/etc/resolv.conf.wg-quick-backup.$INTERFACE" ]] || return 0
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cmd mv "/etc/resolv.conf.wg-quick-backup.$INTERFACE" /etc/resolv.conf
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}
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add_route() {
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[[ $TABLE != off ]] || return 0
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local family ifaceroute
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if [[ $1 == *:* ]]; then
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family=inet6
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[[ -n $FIRSTADDR6 ]] || die "Local IPv6 address must be set to have routes"
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ifaceroute="$FIRSTADDR6"
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else
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family=inet
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[[ -n $FIRSTADDR4 ]] || die "Local IPv4 address must be set to have routes"
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ifaceroute="$FIRSTADDR4"
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fi
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if [[ -n $TABLE && $TABLE != auto ]]; then
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cmd route -q -n add "-$family" -rdomain "$TABLE" "$1" -iface "$ifaceroute"
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elif [[ $1 == */0 ]]; then
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if [[ $1 == *:* ]]; then
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AUTO_ROUTE6=1
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cmd route -q -n add -inet6 ::/1 -iface "$ifaceroute"
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cmd route -q -n add -inet6 8000::/1 -iface "$ifaceroute"
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else
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AUTO_ROUTE4=1
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cmd route -q -n add -inet 0.0.0.0/1 -iface "$ifaceroute"
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cmd route -q -n add -inet 128.0.0.0/1 -iface "$ifaceroute"
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fi
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else
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[[ $(route -n get "-$family" "$1" 2>/dev/null) =~ interface:\ $REAL_INTERFACE$'\n' ]] || cmd route -q -n add "-$family" "$1" -iface "$ifaceroute"
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fi
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}
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set_config() {
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cmd wg setconf "$REAL_INTERFACE" <(echo "$WG_CONFIG")
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}
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save_config() {
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# TODO: actually save addresses by running ifconfig and dnses too
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local old_umask new_config current_config address cmd
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new_config=$'[Interface]\n'
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for address in "${ADDRESSES[@]}"; do
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new_config+="Address = $address"$'\n'
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done
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for address in "${DNS[@]}"; do
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new_config+="DNS = $address"$'\n'
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done
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[[ -n $MTU ]] && new_config+="MTU = $MTU"$'\n'
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[[ -n $TABLE ]] && new_config+="Table = $TABLE"$'\n'
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[[ $SAVE_CONFIG -eq 0 ]] || new_config+=$'SaveConfig = true\n'
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for cmd in "${PRE_UP[@]}"; do
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new_config+="PreUp = $cmd"$'\n'
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done
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for cmd in "${POST_UP[@]}"; do
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new_config+="PostUp = $cmd"$'\n'
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done
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for cmd in "${PRE_DOWN[@]}"; do
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new_config+="PreDown = $cmd"$'\n'
|
||
|
|
done
|
||
|
|
for cmd in "${POST_DOWN[@]}"; do
|
||
|
|
new_config+="PostDown = $cmd"$'\n'
|
||
|
|
done
|
||
|
|
old_umask="$(umask)"
|
||
|
|
umask 077
|
||
|
|
current_config="$(cmd wg showconf "$REAL_INTERFACE")"
|
||
|
|
trap 'rm -f "$CONFIG_FILE.tmp"; exit' INT TERM EXIT
|
||
|
|
echo "${current_config/\[Interface\]$'\n'/$new_config}" > "$CONFIG_FILE.tmp" || die "Could not write configuration file"
|
||
|
|
sync "$CONFIG_FILE.tmp"
|
||
|
|
mv "$CONFIG_FILE.tmp" "$CONFIG_FILE" || die "Could not move configuration file"
|
||
|
|
trap - INT TERM EXIT
|
||
|
|
umask "$old_umask"
|
||
|
|
}
|
||
|
|
|
||
|
|
execute_hooks() {
|
||
|
|
local hook
|
||
|
|
for hook in "$@"; do
|
||
|
|
hook="${hook//%i/$REAL_INTERFACE}"
|
||
|
|
hook="${hook//%I/$INTERFACE}"
|
||
|
|
echo "[#] $hook" >&2
|
||
|
|
(eval "$hook")
|
||
|
|
done
|
||
|
|
}
|
||
|
|
|
||
|
|
cmd_usage() {
|
||
|
|
cat >&2 <<-_EOF
|
||
|
|
Usage: $PROGRAM [ up | down | save ] [ CONFIG_FILE | INTERFACE ]
|
||
|
|
|
||
|
|
CONFIG_FILE is a configuration file, whose filename is the interface name
|
||
|
|
followed by \`.conf'. Otherwise, INTERFACE is an interface name, with
|
||
|
|
configuration found at /etc/wireguard/INTERFACE.conf. It is to be readable
|
||
|
|
by wg(8)'s \`setconf' sub-command, with the exception of the following additions
|
||
|
|
to the [Interface] section, which are handled by $PROGRAM:
|
||
|
|
|
||
|
|
- Address: may be specified one or more times and contains one or more
|
||
|
|
IP addresses (with an optional CIDR mask) to be set for the interface.
|
||
|
|
- DNS: an optional DNS server to use while the device is up.
|
||
|
|
- MTU: an optional MTU for the interface; if unspecified, auto-calculated.
|
||
|
|
- Table: an optional routing table to which routes will be added; if
|
||
|
|
unspecified or \`auto', the default table is used. If \`off', no routes
|
||
|
|
are added.
|
||
|
|
- PreUp, PostUp, PreDown, PostDown: script snippets which will be executed
|
||
|
|
by bash(1) at the corresponding phases of the link, most commonly used
|
||
|
|
to configure DNS. The string \`%i' is expanded to INTERFACE.
|
||
|
|
- SaveConfig: if set to \`true', the configuration is saved from the current
|
||
|
|
state of the interface upon shutdown.
|
||
|
|
|
||
|
|
See wg-quick(8) for more info and examples.
|
||
|
|
_EOF
|
||
|
|
}
|
||
|
|
|
||
|
|
cmd_up() {
|
||
|
|
local i
|
||
|
|
get_real_interface && die "\`$INTERFACE' already exists as \`$REAL_INTERFACE'"
|
||
|
|
trap 'del_if; del_routes; exit' INT TERM EXIT
|
||
|
|
execute_hooks "${PRE_UP[@]}"
|
||
|
|
add_if
|
||
|
|
set_config
|
||
|
|
for i in "${ADDRESSES[@]}"; do
|
||
|
|
add_addr "$i"
|
||
|
|
done
|
||
|
|
set_mtu
|
||
|
|
up_if
|
||
|
|
set_dns
|
||
|
|
for i in $(while read -r _ i; do for i in $i; do [[ $i =~ ^[0-9a-z:.]+/[0-9]+$ ]] && echo "$i"; done; done < <(wg show "$REAL_INTERFACE" allowed-ips) | sort -nr -k 2 -t /); do
|
||
|
|
add_route "$i"
|
||
|
|
done
|
||
|
|
[[ $AUTO_ROUTE4 -eq 1 || $AUTO_ROUTE6 -eq 1 ]] && set_endpoint_direct_route
|
||
|
|
monitor_daemon
|
||
|
|
execute_hooks "${POST_UP[@]}"
|
||
|
|
trap - INT TERM EXIT
|
||
|
|
}
|
||
|
|
|
||
|
|
cmd_down() {
|
||
|
|
if ! get_real_interface || [[ " $(wg show interfaces) " != *" $REAL_INTERFACE "* ]]; then
|
||
|
|
die "\`$INTERFACE' is not a WireGuard interface"
|
||
|
|
fi
|
||
|
|
execute_hooks "${PRE_DOWN[@]}"
|
||
|
|
[[ $SAVE_CONFIG -eq 0 ]] || save_config
|
||
|
|
del_if
|
||
|
|
unset_dns
|
||
|
|
execute_hooks "${POST_DOWN[@]}"
|
||
|
|
}
|
||
|
|
|
||
|
|
cmd_save() {
|
||
|
|
if ! get_real_interface || [[ " $(wg show interfaces) " != *" $REAL_INTERFACE "* ]]; then
|
||
|
|
die "\`$INTERFACE' is not a WireGuard interface"
|
||
|
|
fi
|
||
|
|
save_config
|
||
|
|
}
|
||
|
|
|
||
|
|
# ~~ function override insertion point ~~
|
||
|
|
|
||
|
|
if [[ $# -eq 1 && ( $1 == --help || $1 == -h || $1 == help ) ]]; then
|
||
|
|
cmd_usage
|
||
|
|
elif [[ $# -eq 2 && $1 == up ]]; then
|
||
|
|
auto_su
|
||
|
|
parse_options "$2"
|
||
|
|
cmd_up
|
||
|
|
elif [[ $# -eq 2 && $1 == down ]]; then
|
||
|
|
auto_su
|
||
|
|
parse_options "$2"
|
||
|
|
cmd_down
|
||
|
|
elif [[ $# -eq 2 && $1 == save ]]; then
|
||
|
|
auto_su
|
||
|
|
parse_options "$2"
|
||
|
|
cmd_save
|
||
|
|
else
|
||
|
|
cmd_usage
|
||
|
|
exit 1
|
||
|
|
fi
|
||
|
|
|
||
|
|
exit 0
|