wg-config: use ip rules instead of tungate
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
09c726a72f
commit
87abf354f1
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@ -2,12 +2,10 @@ PREFIX ?= /usr
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DESTDIR ?=
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SBINDIR ?= $(PREFIX)/sbin
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SCRIPTS := wg-config tungate
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all:
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@echo "These are shell scripts, so there is nothing to do. Try \"make install\" instead."
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@echo "This is a shell script, so there is nothing to do. Try \"make install\" instead."
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install:
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@install -v -m0755 -D -t$(DESTDIR)$(SBINDIR) $(SCRIPTS)
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@install -v -m0755 -D -t$(DESTDIR)$(SBINDIR) wg-config
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.PHONY: all install
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@ -43,17 +43,9 @@ options described above, and variables that may be declared in ENV_FILE:
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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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== Basic Example ==
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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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This basic example might be used by a server.
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/etc/wireguard/wg-server.conf:
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@ -83,36 +75,11 @@ Run at startup:
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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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This type of configuration might be desirable for a personal access gateway
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VPN, connecting to a server like in the example above.
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/etc/wireguard/wg-vpn-gateway.env:
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CONFIG_FILE_CONTENTS="
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@ -138,3 +105,36 @@ 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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== Advanced Example ==
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This achieves the same as the above, but with an external file. It only sets the
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configuration file when the subcommand is add, to prevent it from being overwritten.
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The above is much simpler and probably preferred, but this example shows how powerful
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the tool can be.
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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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@ -1,43 +0,0 @@
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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 -r; 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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@ -15,7 +15,7 @@ auto_su() {
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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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[[ -n $INTERFACE && -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] && del_if
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exit
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}
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@ -26,6 +26,9 @@ add_if() {
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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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if [[ $(ip route show table all) =~ .*\ dev\ $INTERFACE\ table\ ([0-9]+)\ .* ]]; then
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cmd ip rule delete table ${BASH_REMATCH[1]}
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fi
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cmd ip link delete dev "$INTERFACE"
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}
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@ -38,23 +41,20 @@ add_addr() {
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}
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add_route() {
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if [[ $1 == 0.0.0.0/0 || $1 == ::/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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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 [[ $1 == 0.0.0.0/0 ]]; then
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local endpoint="$(join <(wg show "$INTERFACE" allowed-ips) <(wg show "$INTERFACE" endpoints) | sed -n 's/.* 0\.0\.0\.0\/0.* \([0-9.:\/a-z]\+\):[0-9]\+$/\1/p')"
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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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[[ $(join <(wg show "$INTERFACE" allowed-ips) <(wg show "$INTERFACE" endpoints)) =~ .*\ ${1//./\\.}\ ([0-9.:a-f]+):[0-9]+$ ]] && local endpoint="${BASH_REMATCH[1]}"
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[[ -n $endpoint ]] || return 0
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local table=51820
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while [[ -n $(ip route show table $table) ]]; do ((table++)); done
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cmd ip route add "$1" dev "$INTERFACE" table $table
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cmd ip rule add not to "$endpoint" table $table
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}
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set_config() {
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@ -130,16 +130,12 @@ cmd_add() {
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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 | grep -Po '(?<=[\t ])[0-9.:/a-z]+' | sort -nr -k 2 -t /); 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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for i in $(wg show "$INTERFACE" allowed-ips | grep -Po '(?<=[\t ])[0-9.:/a-f]+' | 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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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
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trap - INT TERM EXIT
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@ -148,7 +144,6 @@ cmd_add() {
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cmd_del() {
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auto_su
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[[ $(type -t pre_del) != function ]] || pre_del
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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
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