contrib: add wg-config
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
9707e5d6af
commit
f03aea7574
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PREFIX ?= /usr
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DESTDIR ?=
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SBINDIR ?= $(PREFIX)/sbin
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SCRIPTS := wg-config tungate
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all:
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@echo "These are shell scripts, so there is nothing to do. Try \"make install\" instead."
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install:
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@install -v -m0755 -D -t$(DESTDIR)$(SBINDIR) $(SCRIPTS)
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.PHONY: all install
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== Installation ==
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# make install
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== Usage ==
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wg-config is a very simple utility for adding and configuring WireGuard
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interfaces using ip(8) and wg(8).
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Usage: wg-config [ add | del ] INTERFACE [arguments...]
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wg-config add INTERFACE --config=CONFIG_FILE [--address=ADDRESS/CIDR...]
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[--route=ROUTE/CIDR...] [--no-auto-route-from-allowed-ips]
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[--env-file=ENV_FILE]
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The add subcommand adds a new WireGuard interface, INTERFACE, replacing
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any existing interfaces of the same name. The --config argument is
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required, and its argument is passed to wg(8)'s setconf subcommand. The
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--address argument(s) is recommended for this utility to be useful. The
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--route argument is purely optional, as by default this utility will
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automatically add routes implied by --address and as implied by the
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allowed-ip entries inside the --config file. To disable this automatic
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route adding, you may use the option entitled --no-auto-route-from-allowed-ips.
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wg-config del INTERFACE [--config=CONFIG_FILE_TO_SAVE] [--env-file=ENV_FILE]
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The del subcommand removes an existing WireGuard interface. If the
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optional --config is specified, then the existing configuration is
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written out to the file specified, via wg(8)'s showconf subcommand.
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Both `add' and del' take the --env-file=ENV_FILE option. If specified,
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the contents of ENV_FILE are imported into wg-config. This can be used to
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set variables in a file, instead of needing to pass them on the command
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line. The following table shows the relation between the command line
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options described above, and variables that may be declared in ENV_FILE:
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--address=A, --address=B, --address=C ADDRESSES=( "A" "B" "C" )
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--route=A, --route=B, --route=C ADDITIONAL_ROUTES=( "A" "B" "C" )
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--config-file=F CONFIG_FILE="F"
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echo C > /tmp/F, --config-file=/tmp/F CONFIG_FILE_CONTENTS="C"
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--no-auto-route-from-allowed-ips AUTO_ROUTE=0
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Additionally, ENV_FILE may define the bash functions pre_add, post_add,
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pre_del, and post_del, which will be called at their respective times.
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== Helper Tool ==
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tungate is a separate utility, developed originally not explicitly for
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WireGuard, which acts as a poor man's way of ensuring 0/1 and 128/1 default
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route overrides still work with an endpoint going over the original default
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route. It's quite handy, and wg-config makes use of it for dealing with
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0.0.0.0/0 routes. At the moment it only supports IPv4, but adding IPv6
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should be pretty easy.
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== Example ==
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/etc/wireguard/wg-server.conf:
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[Interface]
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PrivateKey = yAnz5TF+lXXJte14tji3zlMNq+hd2rYUIgJBgB3fBmk=
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ListenPort = 41414
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[Peer]
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PublicKey = xTIBA5rboUvnH4htodjb6e697QjLERt1NAB4mZqp8Dg=
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AllowedIPs = 10.192.122.3/32, 10.192.124.1/24
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[Peer]
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PublicKey = TrMvSoP4jYQlY6RIzBgbssQqY3vxI2Pi+y71lOWWXX0=
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AllowedIPs = 10.192.122.4/32, 192.168.0.0/16
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[Peer]
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PublicKey = gN65BkIKy1eCE9pP1wdc8ROUtkHLF2PfAqYdyYBz6EA=
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AllowedIPs = 10.10.10.230/32
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/etc/wireguard/wg-server.env:
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CONFIG_FILE="$(dirname "${BASH_SOURCE[0]}")/wg-server.conf"
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ADDRESSES=( 10.192.122.1/34 10.10.0.1/16 )
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Run at startup:
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# wg-config add wgserver0 --env-file=/etc/wireguard/wg-server.env
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Run at shutdown:
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# wg-config del wgserver0 --env-file=/etc/wireguard/wg-server.env
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== Advanced Example ==
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/etc/wireguard/wg-vpn-gateway.conf:
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[Interface]
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PrivateKey = 6JiA3fa+NG+x5m6aq7+lxlVaVqVf1mxK6/pDOZdNuXc=
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[Peer]
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PublicKey = 6NagfTu+s8+TkEKpxX7pNjJuTf4zYtoJme7iQFYIw0A=
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AllowedIPs = 0.0.0.0/0
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Endpoint = demo.wireguard.io:29912
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/etc/wireguard/wg-vpn-gateway.env:
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[[ $SUBCOMMAND == add ]] && CONFIG_FILE="$(dirname "${BASH_SOURCE[0]}")/demo-vpn.conf" || true
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ADDRESSES=( 10.200.100.2/32 )
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post_add() {
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printf 'nameserver 10.200.100.1' | cmd resolvconf -a "$INTERFACE" -m 0
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}
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post_del() {
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cmd resolvconf -d "$INTERFACE"
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}
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Run to flip on the VPN:
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# wg-config add wgvpn0 --env-file=/etc/wireguard/wg-vpn-gateway.env
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The config file is not overwritten on shutdown, due to the conditional in the env file:
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# wg-config del wgvpn0 --env-file=/etc/wireguard/wg-vpn-gateway.env
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== Single File Advanced Example ==
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/etc/wireguard/wg-vpn-gateway.env:
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CONFIG_FILE_CONTENTS="
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[Interface]
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PrivateKey = 6JiA3fa+NG+x5m6aq7+lxlVaVqVf1mxK6/pDOZdNuXc=
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[Peer]
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PublicKey = 6NagfTu+s8+TkEKpxX7pNjJuTf4zYtoJme7iQFYIw0A=
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AllowedIPs = 0.0.0.0/0
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Endpoint = demo.wireguard.io:29912
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"
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ADDRESSES=( 10.200.100.2/32 )
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post_add() {
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printf 'nameserver 10.200.100.1' | cmd resolvconf -a "$INTERFACE" -m 0
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}
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post_del() {
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cmd resolvconf -d "$INTERFACE"
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}
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Run to flip on the VPN:
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# wg-config add wgvpn0 --env-file=/etc/wireguard/wg-vpn-gateway.env
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Run to flip off the VPN:
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# wg-config del wgvpn0 --env-file=/etc/wireguard/wg-vpn-gateway.env
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#!/bin/bash
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unwind() {
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ip route del "$1/32" 2>/dev/null
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exit
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}
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short_route() {
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ip route | sed -n "s/$1 \\(.* dev [^ ]\\+\\).*/\\1/p" | head -n 1
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}
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resolve_ip() {
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local filter='/^[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}$/{p;q;}'
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[[ $(sed -n "$filter" <<<"$1") == "$1" ]] && echo "$1" ||
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host -t a "$1" | cut -d ' ' -f 4 | sed -n "$filter"
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}
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set_route() {
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local default_route="$(short_route default)"
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[[ -n $default_route ]] || { echo "[-] Could not determine default route"; return; }
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echo "[+] Adding route for $1 to be $default_route"
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ip route del "$1/32" 2>/dev/null
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ip route add "$1/32" $default_route
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}
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check_loop() {
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local ip="$(resolve_ip "$1")"
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[[ -n $ip ]] || { echo "[-] Could not determine IP of '$1'" && return 1; }
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echo "[+] Making sure $ip goes over the default (non-0/1,128/1) route"
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set_route "$ip"
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trap unwind INT TERM EXIT
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while read; do
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[[ $(short_route "$ip") != "$(short_route default)" ]] && set_route "$ip"
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done < <(exec ip monitor route)
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}
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[[ $# -ne 1 ]] && { echo "Usage: $0 IP|HOST" >&2; exit 1; }
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[[ $UID -ne 0 ]] && exec sudo "$(readlink -f "$0")" "$@"
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check_loop "$1"
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exit $?
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#!/bin/bash
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set -e -o pipefail
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export PATH="$(dirname "$(readlink -f "$0")"):$PATH"
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cmd() {
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echo "[#] $*" >&2
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"$@"
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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: " "$(readlink -f "$0")" "${ARGS[@]}" || true
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}
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unwind() {
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set +e
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[[ -n $INTERFACE && -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] && cmd ip link delete dev "$INTERFACE"
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exit
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}
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add_if() {
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ip link delete dev "$INTERFACE" 2>/dev/null || true
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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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[[ -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] || { echo "$PROGRAM: \`$INTERFACE' is not a WireGuard interface" >&2; exit 1; }
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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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add_route() {
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cmd ip route add "$1" dev "$INTERFACE"
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}
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add_default() {
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if [[ $1 == ::/0 ]]; then
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echo "tungate: does not yet support IPv6, skipping ::/0" >&2
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return 0
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elif [[ $1 == 0.0.0.0/0 ]]; then
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local endpoint="$(wg show "$INTERFACE" endpoints | grep "^$(wg show "$INTERFACE" allowed-ips | grep 0.0.0.0/0 | head -n 1 | cut -f 1)" | cut -f 2 | cut -d : -f 1)"
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add_route 0/1
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add_route 128/1
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killall tungate 2>/dev/null || true
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echo "[&] Forking \`tungate' for $endpoint to background" >&2
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tungate "$endpoint" >/dev/null 2>&1 & disown
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return 0
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fi
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return 1
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}
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set_config() {
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if [[ -n $CONFIG_FILE_CONTENTS ]]; then
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cmd wg setconf "$INTERFACE" <(echo "$CONFIG_FILE_CONTENTS")
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else
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cmd wg setconf "$INTERFACE" "$CONFIG_FILE"
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fi
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}
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save_config() {
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local old_umask="$(umask)"
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umask 077
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cmd wg showconf "$INTERFACE" > "$CONFIG_FILE.tmp" || { rm -f "$CONFIG_FILE.tmp"; exit 1; }
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mv "$CONFIG_FILE.tmp" "$CONFIG_FILE" || { rm -f "$CONFIG_FILE.tmp"; exit 1; }
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umask "$old_umask"
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}
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cmd_usage() {
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cat >&2 <<-_EOF
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Usage: $PROGRAM [ add | del ] INTERFACE [arguments...]
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$PROGRAM add INTERFACE --config=CONFIG_FILE [--address=ADDRESS/CIDR...]
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[--route=ROUTE/CIDR...] [--no-auto-route-from-allowed-ips]
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[--env-file=ENV_FILE]
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The add subcommand adds a new WireGuard interface, INTERFACE, replacing
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any existing interfaces of the same name. The --config argument is
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required, and its argument is passed to wg(8)'s setconf subcommand. The
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--address argument(s) is recommended for this utility to be useful. The
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--route argument is purely optional, as by default this utility will
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automatically add routes implied by --address and as implied by the
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allowed-ip entries inside the --config file. To disable this automatic
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route adding, you may use the option entitled --no-auto-route-from-allowed-ips.
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$PROGRAM del INTERFACE [--config=CONFIG_FILE_TO_SAVE] [--env-file=ENV_FILE]
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The del subcommand removes an existing WireGuard interface. If the
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optional --config is specified, then the existing configuration is
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written out to the file specified, via wg(8)'s showconf subcommand.
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$PROGRAM help
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Show this message.
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Both \`add' and ``del' take the --env-file=ENV_FILE option. If specified,
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the contents of ENV_FILE are imported into $PROGRAM. This can be used to
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set variables in a file, instead of needing to pass them on the command
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line. The following table shows the relation between the command line
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options described above, and variables that may be declared in ENV_FILE:
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--address=A, --address=B, --address=C ADDRESSES=( "A" "B" "C" )
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--route=A, --route=B, --route=C ADDITIONAL_ROUTES=( "A" "B" "C" )
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--config-file=F CONFIG_FILE="F"
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echo C > /tmp/F, --config-file=/tmp/F CONFIG_FILE_CONTENTS="C"
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--no-auto-route-from-allowed-ips AUTO_ROUTE=0
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Additionally, ENV_FILE may define the bash functions pre_add, post_add,
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pre_del, and post_del, which will be called at their respective times.
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_EOF
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}
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cmd_add() {
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local i
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[[ -n $CONFIG_FILE || -n $CONFIG_FILE_CONTENTS ]] || { echo "$PROGRAM: --config is required for add subcommand" >&2; exit 1; }
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auto_su
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trap unwind INT TERM EXIT
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[[ $(type -t pre_add) == function ]] && pre_add || true
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add_if
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set_config
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for i in "${ADDRESSES[@]}"; do
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add_addr "$i"
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done
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up_if
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if [[ $AUTO_ROUTE -eq 1 ]]; then
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for i in $(wg show "$INTERFACE" allowed-ips | cut -f 2 | tr -d ,); do
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if ! add_default "$i" && [[ $(ip route get "$i") != *dev\ $INTERFACE\ * ]]; then
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add_route "$i"
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fi
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done
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fi
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for i in "${ADDITIONAL_ROUTES[@]}"; do
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if ! add_default "$i"; then
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add_route "$i"
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fi
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done
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[[ $(type -t post_add) == function ]] && post_add || true
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trap - INT TERM EXIT
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}
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cmd_del() {
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auto_su
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[[ $(type -t pre_del) == function ]] && pre_del || true
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killall tungate 2>/dev/null || true
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[[ -n $CONFIG_FILE ]] && save_config
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del_if
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[[ $(type -t post_del) == function ]] && post_del || true
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}
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declare INTERFACE="$2"
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declare SUBCOMMAND="$1"
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declare -a ADDRESSES
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declare -a ADDITIONAL_ROUTES
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declare AUTO_ROUTE=1
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declare CONFIG_FILE
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declare CONFIG_FILE_CONTENTS
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declare PROGRAM="${0##*/}"
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declare -a ARGS=( "$@" )
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[[ -n $INTERFACE && -n $SUBCOMMAND ]] || { cmd_usage; exit 1; }
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shift 2
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for arg; do
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case "$arg" in
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--env-file=*) source "${arg#*=}" ;;
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--config=*) CONFIG_FILE="${arg#*=}" ;;
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--address=*) ADDRESSES+=( ${arg#*=} ) ;;
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--route=*) ADDITIONAL_ROUTES+=( ${arg#*=} ) ;;
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--no-auto-route-from-allowed-ips) AUTO_ROUTE=0 ;;
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*) cmd_usage; exit 1 ;;
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esac
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done
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case "$SUBCOMMAND" in
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add) cmd_add ;;
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del) cmd_del ;;
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*) cmd_usage; exit 1 ;;
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esac
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exit 0
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