wg-quick: add darwin implementation
It's pretty rough and leaves much to be desired, but it works. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
5d9433d73f
commit
a5412d1056
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@ -0,0 +1,444 @@
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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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# The shebang is in /usr/local because this requires bash 4.
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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="${BASH_SOURCE[0]}"
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SELF="$(cd "${SELF%/*}" && pwd -P)/${SELF##*/}"
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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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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="$(cd "${CONFIG_FILE%/*}" && pwd -P)/${CONFIG_FILE##*/}"
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((($(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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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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auto_su() {
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[[ $UID == 0 ]] || exec sudo -p "$PROGRAM must be run as root. Please enter the password for %u to continue: " "$SELF" "${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 $REAL_INTERFACE" >&2
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return 0
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}
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add_if() {
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export WG_DARWIN_UTUN_NAME_FILE="/var/run/wireguard/$INTERFACE.name"
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cmd wireguard-go utun
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local i
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for i in {1..30}; do
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[[ -f "/var/run/wireguard/$INTERFACE.name" ]] && break
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sleep 0.1
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done
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get_real_interface
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}
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del_routes() {
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local todelete=( ) destination netif
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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 delete -inet "$destination" >/dev/null || true
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done
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todelete=( )
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while read -r destination _ _ netif; do
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[[ $netif == "$REAL_INTERFACE" ]] && todelete+=( "$destination" )
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done < <(netstat -nr -f inet6)
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for destination in "${todelete[@]}"; do
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cmd route -q delete -inet6 "$destination" >/dev/null || true
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done
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for destination in "${ENDPOINTS[@]}"; do
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if [[ $destination == *:* ]]; then
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cmd route -q delete -inet6 "$destination" >/dev/null || true
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else
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cmd route -q delete -inet "$destination" >/dev/null || 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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[[ -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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if [[ $1 == *:* ]]; then
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cmd ifconfig "$REAL_INTERFACE" inet6 "$1"
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else
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cmd ifconfig "$REAL_INTERFACE" inet "$1" "${1%%/*}"
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fi
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}
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set_mtu() {
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local mtu=0 current_mtu=-1 destination netif defaultif
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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 destination _ _ _ _ netif _; do
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if [[ $destination == default ]]; then
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defaultif="$netif"
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break
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fi
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done < <(netstat -nr -f inet)
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[[ -n $defaultif && $(ifconfig "$defaultif") =~ mtu\ ([0-9]+) ]] && mtu="${BASH_REMATCH[1]}"
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[[ $mtu -gt 0 ]] || mtu=1500
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mtu=$(( mtu - 80 ))
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[[ $(ifconfig "$REAL_INTERFACE") =~ mtu\ ([0-9]+) ]] && current_mtu="${BASH_REMATCH[1]}"
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[[ $mtu -eq $current_mtu ]] || cmd ifconfig "$REAL_INTERFACE" mtu "$mtu"
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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 [[ $endpoint == *:* ]]; then
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cmd route -q delete -inet6 "$endpoint" >/dev/null 2>&1 || true
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else
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cmd route -q delete -inet "$endpoint" >/dev/null 2>&1 || true
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fi
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done
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for endpoint in "${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 == *:* && -n $GATEWAY6 ]]; then
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cmd route -q add -inet6 "$endpoint" -gateway "$GATEWAY6" >/dev/null || true
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added+=( "$endpoint" )
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elif [[ -n $GATEWAY4 ]]; then
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cmd route -q add -inet "$endpoint" -gateway "$GATEWAY4" >/dev/null || true
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added+=( "$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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set_dns() {
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# TODO: this should use scutil and be slightly more clever. But for now
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# we simply overwrite any _manually set_ DNS servers for all network
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# services. This means we get into trouble if the user doesn't actually
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# want DNS via DHCP when setting this back to "empty". Because macOS is
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# so horrible to deal with here, we'll simply wait for irate users to
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# provide a patch themselves.
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local service response
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{ read -r _; while read -r service; do
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[[ $service == "*"* ]] && service="${service:1}"
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while read -r response; do
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[[ $response == *Error* ]] && echo "$response" >&2
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done < <(cmd networksetup -setdnsservers "$service" "${DNS[@]}")
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done; } < <(networksetup -listallnetworkservices)
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}
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del_dns() {
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{ read -r _; while read -r service; do
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[[ $service == "*"* ]] && service="${service:1}"
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while read -r response; do
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[[ $response == *Error* ]] && echo "$response" >&2
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done < <(cmd networksetup -setdnsservers "$service" Empty)
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done; } < <(networksetup -listallnetworkservices)
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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; del_dns; exit 0' INT TERM EXIT
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exec 1>&- 2>&-
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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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[[ -z $MTU ]] && set_mtu
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[[ ${#DNS[@]} -gt 0 ]] && set_dns
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done < <(route -n monitor)) & disown
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}
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add_route() {
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[[ $TABLE != off ]] || return 0
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local family=inet
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[[ $1 == *:* ]] && family=inet6
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if [[ $1 == */0 && ( -z $TABLE || $TABLE == auto ) ]]; then
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if [[ $1 == *:* ]]; then
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AUTO_ROUTE6=1
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cmd route -q add -inet6 ::/1 -interface "$REAL_INTERFACE" >/dev/null
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cmd route -q add -inet6 8000::/1 -interface "$REAL_INTERFACE" >/dev/null
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else
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AUTO_ROUTE4=1
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cmd route -q add -inet 0.0.0.0/1 -interface "$REAL_INTERFACE" >/dev/null
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cmd route -q add -inet 128.0.0.0/1 -interface "$REAL_INTERFACE" >/dev/null
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fi
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else
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[[ $TABLE == main || $TABLE == auto || -z $TABLE ]] || die "Darwin only supports TABLE=auto|main|off"
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cmd route -q add "-$family" "$1" -interface "$REAL_INTERFACE" >/dev/null
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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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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'
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done
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for cmd in "${POST_DOWN[@]}"; do
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new_config+="PostDown = $cmd"$'\n'
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done
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old_umask="$(umask)"
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umask 077
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current_config="$(cmd wg showconf "$REAL_INTERFACE")"
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trap 'rm -f "$CONFIG_FILE.tmp"; exit' INT TERM EXIT
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echo "${current_config/\[Interface\]$'\n'/$new_config}" > "$CONFIG_FILE.tmp" || die "Could not write configuration file"
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sync "$CONFIG_FILE.tmp"
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mv "$CONFIG_FILE.tmp" "$CONFIG_FILE" || die "Could not move configuration file"
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trap - INT TERM EXIT
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umask "$old_umask"
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}
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execute_hooks() {
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local hook
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for hook in "$@"; do
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hook="${hook//%i/$REAL_INTERFACE}"
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hook="${hook//%I/$INTERFACE}"
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echo "[#] $hook" >&2
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(eval "$hook")
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done
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}
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cmd_usage() {
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cat >&2 <<-_EOF
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Usage: $PROGRAM [ up | down | save ] [ CONFIG_FILE | INTERFACE ]
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CONFIG_FILE is a configuration file, whose filename is the interface name
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followed by \`.conf'. Otherwise, INTERFACE is an interface name, with
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configuration found at /etc/wireguard/INTERFACE.conf. It is to be readable
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by wg(8)'s \`setconf' sub-command, with the exception of the following additions
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to the [Interface] section, which are handled by $PROGRAM:
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- Address: may be specified one or more times and contains one or more
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IP addresses (with an optional CIDR mask) to be set for the interface.
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- DNS: an optional DNS server to use while the device is up.
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- MTU: an optional MTU for the interface; if unspecified, auto-calculated.
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- Table: an optional routing table to which routes will be added; if
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unspecified or \`auto', the default table is used. If \`off', no routes
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are added. Besides \`auto' and \`off', only \`main' is supported on
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this platform.
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- PreUp, PostUp, PreDown, PostDown: script snippets which will be executed
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by bash(1) at the corresponding phases of the link, most commonly used
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to configure DNS. The string \`%i' is expanded to INTERFACE.
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- SaveConfig: if set to \`true', the configuration is saved from the current
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state of the interface upon shutdown.
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See wg-quick(8) for more info and examples.
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_EOF
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}
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cmd_up() {
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local i
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get_real_interface && die "\`$INTERFACE' already exists as \`$REAL_INTERFACE'"
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trap 'del_if; del_routes; exit' INT TERM EXIT
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execute_hooks "${PRE_UP[@]}"
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add_if
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set_config
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for i in "${ADDRESSES[@]}"; do
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add_addr "$i"
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done
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set_mtu
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up_if
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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)); do
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add_route "$i"
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done
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[[ $AUTO_ROUTE4 -eq 1 || $AUTO_ROUTE6 -eq 1 ]] && set_endpoint_direct_route
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[[ ${#DNS[@]} -gt 0 ]] && set_dns
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monitor_daemon
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execute_hooks "${POST_UP[@]}"
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trap - INT TERM EXIT
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}
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cmd_down() {
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if ! get_real_interface || [[ " $(wg show interfaces) " != *" $REAL_INTERFACE "* ]]; then
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die "\`$INTERFACE' is not a WireGuard interface"
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fi
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execute_hooks "${PRE_DOWN[@]}"
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[[ $SAVE_CONFIG -eq 0 ]] || save_config
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del_if
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execute_hooks "${POST_DOWN[@]}"
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}
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cmd_save() {
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if ! get_real_interface || [[ " $(wg show interfaces) " != *" $REAL_INTERFACE "* ]]; then
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die "\`$INTERFACE' is not a WireGuard interface"
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fi
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save_config
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}
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# ~~ function override insertion point ~~
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|
||||
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
|
||||
Reference in New Issue