325 lines
9.8 KiB
Bash
Executable File
325 lines
9.8 KiB
Bash
Executable File
#!/bin/bash
|
|
# SPDX-License-Identifier: GPL-2.0
|
|
#
|
|
# Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
|
|
#
|
|
|
|
set -e -o pipefail
|
|
shopt -s extglob
|
|
export LC_ALL=C
|
|
|
|
SELF="$(readlink -f "${BASH_SOURCE[0]}")"
|
|
export PATH="${SELF%/*}:$PATH"
|
|
|
|
WG_CONFIG=""
|
|
INTERFACE=""
|
|
ADDRESSES=( )
|
|
MTU=""
|
|
DNS=( )
|
|
TABLE=""
|
|
PRE_UP=( )
|
|
POST_UP=( )
|
|
PRE_DOWN=( )
|
|
POST_DOWN=( )
|
|
SAVE_CONFIG=0
|
|
CONFIG_FILE=""
|
|
PROGRAM="${0##*/}"
|
|
ARGS=( "$@" )
|
|
|
|
parse_options() {
|
|
local interface_section=0 line key value stripped
|
|
CONFIG_FILE="$1"
|
|
[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,15}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf"
|
|
[[ -e $CONFIG_FILE ]] || die "\`$CONFIG_FILE' does not exist"
|
|
[[ $CONFIG_FILE =~ (^|/)([a-zA-Z0-9_=+.-]{1,15})\.conf$ ]] || die "The config file must be a valid interface name, followed by .conf"
|
|
CONFIG_FILE="$(readlink -f "$CONFIG_FILE")"
|
|
((($(stat -c '0%#a' "$CONFIG_FILE") & $(stat -c '0%#a' "${CONFIG_FILE%/*}") & 0007) == 0)) || echo "Warning: \`$CONFIG_FILE' is world accessible" >&2
|
|
INTERFACE="${BASH_REMATCH[2]}"
|
|
shopt -s nocasematch
|
|
while read -r line || [[ -n $line ]]; do
|
|
stripped="${line%%\#*}"
|
|
key="${stripped%%=*}"; key="${key##*([[:space:]])}"; key="${key%%*([[:space:]])}"
|
|
value="${stripped#*=}"; value="${value##*([[:space:]])}"; value="${value%%*([[:space:]])}"
|
|
[[ $key == "["* ]] && interface_section=0
|
|
[[ $key == "[Interface]" ]] && interface_section=1
|
|
if [[ $interface_section -eq 1 ]]; then
|
|
case "$key" in
|
|
Address) ADDRESSES+=( ${value//,/ } ); continue ;;
|
|
MTU) MTU="$value"; continue ;;
|
|
DNS) DNS+=( ${value//,/ } ); continue ;;
|
|
Table) TABLE="$value"; continue ;;
|
|
PreUp) PRE_UP+=( "$value" ); continue ;;
|
|
PreDown) PRE_DOWN+=( "$value" ); continue ;;
|
|
PostUp) POST_UP+=( "$value" ); continue ;;
|
|
PostDown) POST_DOWN+=( "$value" ); continue ;;
|
|
SaveConfig) read_bool SAVE_CONFIG "$value"; continue ;;
|
|
esac
|
|
fi
|
|
WG_CONFIG+="$line"$'\n'
|
|
done < "$CONFIG_FILE"
|
|
shopt -u nocasematch
|
|
}
|
|
|
|
read_bool() {
|
|
case "$2" in
|
|
true) printf -v "$1" 1 ;;
|
|
false) printf -v "$1" 0 ;;
|
|
*) die "\`$2' is neither true nor false"
|
|
esac
|
|
}
|
|
|
|
cmd() {
|
|
echo "[#] $*" >&2
|
|
"$@"
|
|
}
|
|
|
|
die() {
|
|
echo "$PROGRAM: $*" >&2
|
|
exit 1
|
|
}
|
|
|
|
auto_su() {
|
|
[[ $UID == 0 ]] || exec sudo -p "$PROGRAM must be run as root. Please enter the password for %u to continue: " "$SELF" "${ARGS[@]}"
|
|
}
|
|
|
|
add_if() {
|
|
cmd ip link add "$INTERFACE" type wireguard
|
|
}
|
|
|
|
del_if() {
|
|
local fwmark
|
|
[[ $HAVE_SET_DNS -eq 0 ]] || unset_dns
|
|
fwmark="$(wg show "$INTERFACE" fwmark)"
|
|
DEFAULT_TABLE=0
|
|
[[ $fwmark != off ]] && DEFAULT_TABLE=$(( fwmark ))
|
|
if [[ $DEFAULT_TABLE -ne 0 ]]; then
|
|
while [[ $(ip -4 rule show) == *"lookup $DEFAULT_TABLE"* ]]; do
|
|
cmd ip -4 rule delete table $DEFAULT_TABLE
|
|
done
|
|
while [[ $(ip -4 rule show) == *"from all lookup main suppress_prefixlength 0"* ]]; do
|
|
cmd ip -4 rule delete table main suppress_prefixlength 0
|
|
done
|
|
while [[ $(ip -6 rule show) == *"lookup $DEFAULT_TABLE"* ]]; do
|
|
cmd ip -6 rule delete table $DEFAULT_TABLE
|
|
done
|
|
while [[ $(ip -6 rule show) == *"from all lookup main suppress_prefixlength 0"* ]]; do
|
|
cmd ip -6 rule delete table main suppress_prefixlength 0
|
|
done
|
|
fi
|
|
cmd ip link delete dev "$INTERFACE"
|
|
}
|
|
|
|
up_if() {
|
|
cmd ip link set "$INTERFACE" up
|
|
}
|
|
|
|
add_addr() {
|
|
cmd ip address add "$1" dev "$INTERFACE"
|
|
}
|
|
|
|
set_mtu() {
|
|
local mtu=0 endpoint output
|
|
if [[ -n $MTU ]]; then
|
|
cmd ip link set mtu "$MTU" dev "$INTERFACE"
|
|
return
|
|
fi
|
|
while read -r _ endpoint; do
|
|
[[ $endpoint =~ ^\[?([a-z0-9:.]+)\]?:[0-9]+$ ]] || continue
|
|
output="$(ip route get "${BASH_REMATCH[1]}" || true)"
|
|
[[ ( $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]}"
|
|
done < <(wg show "$INTERFACE" endpoints)
|
|
if [[ $mtu -eq 0 ]]; then
|
|
read -r output < <(ip route show default || true) || true
|
|
[[ ( $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]}"
|
|
fi
|
|
[[ $mtu -gt 0 ]] || mtu=1500
|
|
cmd ip link set mtu $(( mtu - 80 )) dev "$INTERFACE"
|
|
}
|
|
|
|
resolvconf_iface_prefix() {
|
|
[[ -f /etc/resolvconf/interface-order ]] || return 0
|
|
local iface
|
|
while read -r iface; do
|
|
[[ $iface =~ ^([A-Za-z0-9-]+)\*$ ]] || continue
|
|
echo "${BASH_REMATCH[1]}." && return 0
|
|
done < /etc/resolvconf/interface-order
|
|
}
|
|
|
|
HAVE_SET_DNS=0
|
|
set_dns() {
|
|
[[ ${#DNS[@]} -gt 0 ]] || return 0
|
|
printf 'nameserver %s\n' "${DNS[@]}" | cmd resolvconf -a "$(resolvconf_iface_prefix)$INTERFACE" -m 0 -x
|
|
HAVE_SET_DNS=1
|
|
}
|
|
|
|
unset_dns() {
|
|
[[ ${#DNS[@]} -gt 0 ]] || return 0
|
|
cmd resolvconf -d "$(resolvconf_iface_prefix)$INTERFACE"
|
|
}
|
|
|
|
add_route() {
|
|
[[ $TABLE != off ]] || return 0
|
|
|
|
if [[ -n $TABLE && $TABLE != auto ]]; then
|
|
cmd ip route add "$1" dev "$INTERFACE" table "$TABLE"
|
|
elif [[ $1 == */0 ]]; then
|
|
add_default "$1"
|
|
else
|
|
[[ $(ip route get "$i" 2>/dev/null) == *dev\ $INTERFACE\ * ]] || cmd ip route add "$1" dev "$INTERFACE"
|
|
fi
|
|
}
|
|
|
|
DEFAULT_TABLE=
|
|
add_default() {
|
|
if [[ -z $DEFAULT_TABLE ]]; then
|
|
DEFAULT_TABLE=51820
|
|
while [[ -n $(ip -4 route show table $DEFAULT_TABLE) || -n $(ip -6 route show table $DEFAULT_TABLE) ]]; do
|
|
((DEFAULT_TABLE++))
|
|
done
|
|
fi
|
|
local proto=-4
|
|
[[ $1 == *:* ]] && proto=-6
|
|
cmd wg set "$INTERFACE" fwmark $DEFAULT_TABLE
|
|
cmd ip $proto route add "$1" dev "$INTERFACE" table $DEFAULT_TABLE
|
|
cmd ip $proto rule add not fwmark $DEFAULT_TABLE table $DEFAULT_TABLE
|
|
cmd ip $proto rule add table main suppress_prefixlength 0
|
|
local key value
|
|
while read -r key _ value; do
|
|
[[ $value -eq 1 ]] && sysctl -q "$key=2"
|
|
done < <(sysctl -a -r '^net\.ipv4.conf\.[^ .=]+\.rp_filter$')
|
|
return 0
|
|
}
|
|
|
|
set_config() {
|
|
cmd wg setconf "$INTERFACE" <(echo "$WG_CONFIG")
|
|
}
|
|
|
|
save_config() {
|
|
local old_umask new_config current_config address cmd
|
|
[[ $(ip -all -brief address show dev "$INTERFACE") =~ ^$INTERFACE\ +\ [A-Z]+\ +(.+)$ ]] || true
|
|
new_config=$'[Interface]\n'
|
|
for address in ${BASH_REMATCH[1]}; do
|
|
new_config+="Address = $address"$'\n'
|
|
done
|
|
while read -r address; do
|
|
[[ $address =~ ^nameserver\ ([a-zA-Z0-9_=+:%.-]+)$ ]] && new_config+="DNS = ${BASH_REMATCH[1]}"$'\n'
|
|
done < <(resolvconf -l "$(resolvconf_iface_prefix)$INTERFACE" 2>/dev/null || cat "/etc/resolvconf/run/interface/$(resolvconf_iface_prefix)$INTERFACE")
|
|
[[ -n $MTU && $(ip link show dev "$INTERFACE") =~ mtu\ ([0-9]+) ]] && new_config+="MTU = ${BASH_REMATCH[1]}"$'\n'
|
|
[[ -n $TABLE ]] && new_config+="Table = $TABLE"$'\n'
|
|
[[ $SAVE_CONFIG -eq 0 ]] || new_config+=$'SaveConfig = true\n'
|
|
for cmd in "${PRE_UP[@]}"; do
|
|
new_config+="PreUp = $cmd"$'\n'
|
|
done
|
|
for cmd in "${POST_UP[@]}"; do
|
|
new_config+="PostUp = $cmd"$'\n'
|
|
done
|
|
for cmd in "${PRE_DOWN[@]}"; do
|
|
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 "$INTERFACE")"
|
|
trap 'rm -f "$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="${hook//%i/$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
|
|
[[ -z $(ip link show dev "$INTERFACE" 2>/dev/null) ]] || die "\`$INTERFACE' already exists"
|
|
trap 'del_if; exit' INT TERM EXIT
|
|
execute_hooks "${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 "$i"; done; done < <(wg show "$INTERFACE" allowed-ips) | sort -nr -k 2 -t /); do
|
|
add_route "$i"
|
|
done
|
|
execute_hooks "${POST_UP[@]}"
|
|
trap - INT TERM EXIT
|
|
}
|
|
|
|
cmd_down() {
|
|
[[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface"
|
|
execute_hooks "${PRE_DOWN[@]}"
|
|
[[ $SAVE_CONFIG -eq 0 ]] || save_config
|
|
del_if
|
|
unset_dns
|
|
execute_hooks "${POST_DOWN[@]}"
|
|
}
|
|
|
|
cmd_save() {
|
|
[[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface"
|
|
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
|