304 lines
9 KiB
Bash
Executable file
304 lines
9 KiB
Bash
Executable file
#!/bin/bash
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#
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# Copyright (C) 2016-2017 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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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
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CONFIG_FILE="$1"
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[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,16}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf"
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[[ -e $CONFIG_FILE ]] || die "\`$CONFIG_FILE' does not exist"
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[[ $CONFIG_FILE =~ /?([a-zA-Z0-9_=+.-]{1,16})\.conf$ ]] || 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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((($(stat -c '0%#a' "$CONFIG_FILE") & $(stat -c '0%#a' "${CONFIG_FILE%/*}") & 0007) == 0)) || echo "Warning: \`$CONFIG_FILE' is world accessible" >&2
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INTERFACE="${BASH_REMATCH[1]}"
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shopt -s nocasematch
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while read -r line || [[ -n $line ]]; do
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key="${line%%=*}"; key="${key##*([[:space:]])}"; key="${key%%*([[:space:]])}"
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value="${line#*=}"; value="${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+=( ${value//,/ } ); continue ;;
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PreUp) PRE_UP+=( "$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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add_if() {
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cmd ip link add "$INTERFACE" type wireguard
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}
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del_if() {
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local fwmark
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[[ $HAVE_SET_DNS -eq 0 ]] || unset_dns
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fwmark="$(wg show "$INTERFACE" fwmark)"
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DEFAULT_TABLE=0
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[[ $fwmark != off ]] && DEFAULT_TABLE=$(( fwmark ))
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if [[ $DEFAULT_TABLE -ne 0 ]]; then
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while [[ $(ip -4 rule show) == *"lookup $DEFAULT_TABLE"* ]]; do
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cmd ip -4 rule delete table $DEFAULT_TABLE
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done
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while [[ $(ip -4 rule show) == *"from all lookup main suppress_prefixlength 0"* ]]; do
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cmd ip -4 rule delete table main suppress_prefixlength 0
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done
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while [[ $(ip -6 rule show) == *"lookup $DEFAULT_TABLE"* ]]; do
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cmd ip -6 rule delete table $DEFAULT_TABLE
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done
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while [[ $(ip -6 rule show) == *"from all lookup main suppress_prefixlength 0"* ]]; do
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cmd ip -6 rule delete table main suppress_prefixlength 0
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done
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fi
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cmd ip link delete dev "$INTERFACE"
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}
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up_if() {
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cmd ip link set "$INTERFACE" up
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}
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add_addr() {
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cmd ip address add "$1" dev "$INTERFACE"
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}
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set_mtu() {
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local mtu=0 endpoint output
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if [[ -n $MTU ]]; then
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cmd ip link set mtu "$MTU" dev "$INTERFACE"
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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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output="$(ip route get "${BASH_REMATCH[1]}" || true)"
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[[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}"
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done < <(wg show "$INTERFACE" endpoints)
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if [[ $mtu -eq 0 ]]; then
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read -r output < <(ip route show default || true) || true
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[[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${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 ip link set mtu $(( mtu - 80 )) dev "$INTERFACE"
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}
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HAVE_SET_DNS=0
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set_dns() {
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[[ ${#DNS[@]} -gt 0 ]] || return 0
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printf 'nameserver %s\n' "${DNS[@]}" | cmd resolvconf -a "tun.$INTERFACE" -m 0 -x
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HAVE_SET_DNS=1
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}
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unset_dns() {
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[[ ${#DNS[@]} -gt 0 ]] || return 0
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cmd resolvconf -d "tun.$INTERFACE"
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}
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add_route() {
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if [[ $1 == 0.0.0.0/0 || $1 =~ ^[0:]+/0$ ]]; then
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add_default "$1"
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else
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cmd ip route add "$1" dev "$INTERFACE"
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fi
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}
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DEFAULT_TABLE=
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add_default() {
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if [[ -z $DEFAULT_TABLE ]]; then
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DEFAULT_TABLE=51820
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while [[ -n $(ip -4 route show table $DEFAULT_TABLE) || -n $(ip -6 route show table $DEFAULT_TABLE) ]]; do
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((DEFAULT_TABLE++))
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done
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fi
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local proto=-4
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[[ $1 == *:* ]] && proto=-6
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cmd wg set "$INTERFACE" fwmark $DEFAULT_TABLE
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cmd ip $proto route add "$1" dev "$INTERFACE" table $DEFAULT_TABLE
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cmd ip $proto rule add not fwmark $DEFAULT_TABLE table $DEFAULT_TABLE
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cmd ip $proto rule add table main suppress_prefixlength 0
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local key value
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while read -r key _ value; do
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[[ $value -eq 1 ]] && sysctl -q "$key=2"
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done < <(sysctl -a -r '^net\.ipv4.conf\.[^ .=]+\.rp_filter$')
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return 0
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}
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set_config() {
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cmd wg setconf "$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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[[ $(ip -all -brief address show dev "$INTERFACE") =~ ^$INTERFACE\ +\ [A-Z]+\ +(.+)$ ]] || true
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new_config=$'[Interface]\n'
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for address in ${BASH_REMATCH[1]}; do
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new_config+="Address = $address"$'\n'
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done
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while read -r address; do
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[[ $address =~ ^nameserver\ ([a-zA-Z0-9_=+:%.-]+)$ ]] && new_config+="DNS = ${BASH_REMATCH[1]}"$'\n'
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done < <(resolvconf -l "tun.$INTERFACE" 2>/dev/null)
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[[ -n $MTU && $(ip link show dev "$INTERFACE") =~ mtu\ ([0-9]+) ]] && new_config+="MTU = ${BASH_REMATCH[1]}"$'\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 "$INTERFACE")"
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trap 'rm -f "$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="${hook//%i/$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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- 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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[[ -z $(ip link show dev "$INTERFACE" 2>/dev/null) ]] || die "\`$INTERFACE' already exists"
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trap 'del_if; exit' INT TERM EXIT
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execute_hooks "${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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set_dns
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for i in $(while read -r _ i; do for i in $i; do [[ $i =~ ^[0-9a-z:.]+/[0-9]+$ ]] && echo "$i"; done; done < <(wg show "$INTERFACE" allowed-ips) | sort -nr -k 2 -t /); do
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[[ $(ip route get "$i" 2>/dev/null) == *dev\ $INTERFACE\ * ]] || add_route "$i"
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done
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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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[[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface"
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execute_hooks "${PRE_DOWN[@]}"
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[[ $SAVE_CONFIG -eq 0 ]] || save_config
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del_if
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unset_dns
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execute_hooks "${POST_DOWN[@]}"
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}
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cmd_save() {
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[[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface"
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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
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cmd_usage
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elif [[ $# -eq 2 && $1 == up ]]; then
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auto_su
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parse_options "$2"
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cmd_up
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elif [[ $# -eq 2 && $1 == down ]]; then
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auto_su
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parse_options "$2"
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cmd_down
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elif [[ $# -eq 2 && $1 == save ]]; then
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auto_su
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parse_options "$2"
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cmd_save
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else
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cmd_usage
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exit 1
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fi
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exit 0
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