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
|
|
@ -2,12 +2,10 @@ PREFIX ?= /usr
|
|||
DESTDIR ?=
|
||||
SBINDIR ?= $(PREFIX)/sbin
|
||||
|
||||
SCRIPTS := wg-config tungate
|
||||
|
||||
all:
|
||||
@echo "These are shell scripts, so there is nothing to do. Try \"make install\" instead."
|
||||
@echo "This is a shell script, so there is nothing to do. Try \"make install\" instead."
|
||||
|
||||
install:
|
||||
@install -v -m0755 -D -t$(DESTDIR)$(SBINDIR) $(SCRIPTS)
|
||||
@install -v -m0755 -D -t$(DESTDIR)$(SBINDIR) wg-config
|
||||
|
||||
.PHONY: all install
|
||||
|
|
|
|||
|
|
@ -43,17 +43,9 @@ options described above, and variables that may be declared in ENV_FILE:
|
|||
Additionally, ENV_FILE may define the bash functions pre_add, post_add,
|
||||
pre_del, and post_del, which will be called at their respective times.
|
||||
|
||||
== Basic Example ==
|
||||
|
||||
== Helper Tool ==
|
||||
|
||||
tungate is a separate utility, developed originally not explicitly for
|
||||
WireGuard, which acts as a poor man's way of ensuring 0/1 and 128/1 default
|
||||
route overrides still work with an endpoint going over the original default
|
||||
route. It's quite handy, and wg-config makes use of it for dealing with
|
||||
0.0.0.0/0 routes. At the moment it only supports IPv4, but adding IPv6
|
||||
should be pretty easy.
|
||||
|
||||
== Example ==
|
||||
This basic example might be used by a server.
|
||||
|
||||
/etc/wireguard/wg-server.conf:
|
||||
|
||||
|
|
@ -83,36 +75,11 @@ Run at startup:
|
|||
Run at shutdown:
|
||||
# wg-config del wgserver0 --env-file=/etc/wireguard/wg-server.env
|
||||
|
||||
== Advanced Example ==
|
||||
|
||||
/etc/wireguard/wg-vpn-gateway.conf:
|
||||
|
||||
[Interface]
|
||||
PrivateKey = 6JiA3fa+NG+x5m6aq7+lxlVaVqVf1mxK6/pDOZdNuXc=
|
||||
|
||||
[Peer]
|
||||
PublicKey = 6NagfTu+s8+TkEKpxX7pNjJuTf4zYtoJme7iQFYIw0A=
|
||||
AllowedIPs = 0.0.0.0/0
|
||||
Endpoint = demo.wireguard.io:29912
|
||||
|
||||
/etc/wireguard/wg-vpn-gateway.env:
|
||||
|
||||
[[ $SUBCOMMAND == add ]] && CONFIG_FILE="$(dirname "${BASH_SOURCE[0]}")/demo-vpn.conf" || true
|
||||
ADDRESSES=( 10.200.100.2/32 )
|
||||
post_add() {
|
||||
printf 'nameserver 10.200.100.1' | cmd resolvconf -a "$INTERFACE" -m 0
|
||||
}
|
||||
post_del() {
|
||||
cmd resolvconf -d "$INTERFACE"
|
||||
}
|
||||
|
||||
Run to flip on the VPN:
|
||||
# wg-config add wgvpn0 --env-file=/etc/wireguard/wg-vpn-gateway.env
|
||||
The config file is not overwritten on shutdown, due to the conditional in the env file:
|
||||
# wg-config del wgvpn0 --env-file=/etc/wireguard/wg-vpn-gateway.env
|
||||
|
||||
== Single File Advanced Example ==
|
||||
|
||||
This type of configuration might be desirable for a personal access gateway
|
||||
VPN, connecting to a server like in the example above.
|
||||
|
||||
/etc/wireguard/wg-vpn-gateway.env:
|
||||
|
||||
CONFIG_FILE_CONTENTS="
|
||||
|
|
@ -138,3 +105,36 @@ Run to flip on the VPN:
|
|||
# wg-config add wgvpn0 --env-file=/etc/wireguard/wg-vpn-gateway.env
|
||||
Run to flip off the VPN:
|
||||
# wg-config del wgvpn0 --env-file=/etc/wireguard/wg-vpn-gateway.env
|
||||
|
||||
== Advanced Example ==
|
||||
|
||||
This achieves the same as the above, but with an external file. It only sets the
|
||||
configuration file when the subcommand is add, to prevent it from being overwritten.
|
||||
The above is much simpler and probably preferred, but this example shows how powerful
|
||||
the tool can be.
|
||||
|
||||
/etc/wireguard/wg-vpn-gateway.conf:
|
||||
|
||||
[Interface]
|
||||
PrivateKey = 6JiA3fa+NG+x5m6aq7+lxlVaVqVf1mxK6/pDOZdNuXc=
|
||||
|
||||
[Peer]
|
||||
PublicKey = 6NagfTu+s8+TkEKpxX7pNjJuTf4zYtoJme7iQFYIw0A=
|
||||
AllowedIPs = 0.0.0.0/0
|
||||
Endpoint = demo.wireguard.io:29912
|
||||
|
||||
/etc/wireguard/wg-vpn-gateway.env:
|
||||
|
||||
[[ $SUBCOMMAND == add ]] && CONFIG_FILE="$(dirname "${BASH_SOURCE[0]}")/demo-vpn.conf" || true
|
||||
ADDRESSES=( 10.200.100.2/32 )
|
||||
post_add() {
|
||||
printf 'nameserver 10.200.100.1' | cmd resolvconf -a "$INTERFACE" -m 0
|
||||
}
|
||||
post_del() {
|
||||
cmd resolvconf -d "$INTERFACE"
|
||||
}
|
||||
|
||||
Run to flip on the VPN:
|
||||
# wg-config add wgvpn0 --env-file=/etc/wireguard/wg-vpn-gateway.env
|
||||
The config file is not overwritten on shutdown, due to the conditional in the env file:
|
||||
# wg-config del wgvpn0 --env-file=/etc/wireguard/wg-vpn-gateway.env
|
||||
|
|
|
|||
|
|
@ -1,43 +0,0 @@
|
|||
#!/bin/bash
|
||||
|
||||
unwind() {
|
||||
ip route del "$1/32" 2>/dev/null
|
||||
exit
|
||||
}
|
||||
|
||||
short_route() {
|
||||
ip route | sed -n "s/$1 \\(.* dev [^ ]\\+\\).*/\\1/p" | head -n 1
|
||||
}
|
||||
|
||||
resolve_ip() {
|
||||
local filter='/^[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}$/{p;q;}'
|
||||
[[ $(sed -n "$filter" <<<"$1") == "$1" ]] && echo "$1" ||
|
||||
host -t a "$1" | cut -d ' ' -f 4 | sed -n "$filter"
|
||||
}
|
||||
|
||||
set_route() {
|
||||
local default_route="$(short_route default)"
|
||||
[[ -n $default_route ]] || { echo "[-] Could not determine default route"; return; }
|
||||
echo "[+] Adding route for $1 to be $default_route"
|
||||
ip route del "$1/32" 2>/dev/null
|
||||
ip route add "$1/32" $default_route
|
||||
}
|
||||
|
||||
check_loop() {
|
||||
local ip="$(resolve_ip "$1")"
|
||||
[[ -n $ip ]] || { echo "[-] Could not determine IP of '$1'" && return 1; }
|
||||
echo "[+] Making sure $ip goes over the default (non-0/1,128/1) route"
|
||||
|
||||
set_route "$ip"
|
||||
trap unwind INT TERM EXIT
|
||||
|
||||
while read -r; do
|
||||
[[ $(short_route "$ip") != "$(short_route default)" ]] && set_route "$ip"
|
||||
done < <(exec ip monitor route)
|
||||
}
|
||||
|
||||
[[ $# -ne 1 ]] && { echo "Usage: $0 IP|HOST" >&2; exit 1; }
|
||||
[[ $UID -ne 0 ]] && exec sudo "$(readlink -f "$0")" "$@"
|
||||
|
||||
check_loop "$1"
|
||||
exit $?
|
||||
|
|
@ -15,7 +15,7 @@ auto_su() {
|
|||
|
||||
unwind() {
|
||||
set +e
|
||||
[[ -n $INTERFACE && -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] && cmd ip link delete dev "$INTERFACE"
|
||||
[[ -n $INTERFACE && -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] && del_if
|
||||
exit
|
||||
}
|
||||
|
||||
|
|
@ -26,6 +26,9 @@ add_if() {
|
|||
|
||||
del_if() {
|
||||
[[ -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] || { echo "$PROGRAM: \`$INTERFACE' is not a WireGuard interface" >&2; exit 1; }
|
||||
if [[ $(ip route show table all) =~ .*\ dev\ $INTERFACE\ table\ ([0-9]+)\ .* ]]; then
|
||||
cmd ip rule delete table ${BASH_REMATCH[1]}
|
||||
fi
|
||||
cmd ip link delete dev "$INTERFACE"
|
||||
}
|
||||
|
||||
|
|
@ -38,23 +41,20 @@ add_addr() {
|
|||
}
|
||||
|
||||
add_route() {
|
||||
cmd ip route add "$1" dev "$INTERFACE"
|
||||
if [[ $1 == 0.0.0.0/0 || $1 == ::/0 ]]; then
|
||||
add_default "$1"
|
||||
else
|
||||
cmd ip route add "$1" dev "$INTERFACE"
|
||||
fi
|
||||
}
|
||||
|
||||
add_default() {
|
||||
if [[ $1 == ::/0 ]]; then
|
||||
echo "tungate: does not yet support IPv6, skipping ::/0" >&2
|
||||
return 0
|
||||
elif [[ $1 == 0.0.0.0/0 ]]; then
|
||||
local endpoint="$(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')"
|
||||
add_route 0/1
|
||||
add_route 128/1
|
||||
killall tungate 2>/dev/null || true
|
||||
echo "[&] Forking \`tungate' for $endpoint to background" >&2
|
||||
tungate "$endpoint" >/dev/null 2>&1 & disown
|
||||
return 0
|
||||
fi
|
||||
return 1
|
||||
[[ $(join <(wg show "$INTERFACE" allowed-ips) <(wg show "$INTERFACE" endpoints)) =~ .*\ ${1//./\\.}\ ([0-9.:a-f]+):[0-9]+$ ]] && local endpoint="${BASH_REMATCH[1]}"
|
||||
[[ -n $endpoint ]] || return 0
|
||||
local table=51820
|
||||
while [[ -n $(ip route show table $table) ]]; do ((table++)); done
|
||||
cmd ip route add "$1" dev "$INTERFACE" table $table
|
||||
cmd ip rule add not to "$endpoint" table $table
|
||||
}
|
||||
|
||||
set_config() {
|
||||
|
|
@ -130,16 +130,12 @@ cmd_add() {
|
|||
done
|
||||
up_if
|
||||
if [[ $AUTO_ROUTE -eq 1 ]]; then
|
||||
for i in $(wg show "$INTERFACE" allowed-ips | grep -Po '(?<=[\t ])[0-9.:/a-z]+' | sort -nr -k 2 -t /); do
|
||||
if ! add_default "$i" && [[ $(ip route get "$i") != *dev\ $INTERFACE\ * ]]; then
|
||||
add_route "$i"
|
||||
fi
|
||||
for i in $(wg show "$INTERFACE" allowed-ips | grep -Po '(?<=[\t ])[0-9.:/a-f]+' | sort -nr -k 2 -t /); do
|
||||
[[ $(ip route get "$i" 2>/dev/null) == *dev\ $INTERFACE\ * ]] || add_route "$i"
|
||||
done
|
||||
fi
|
||||
for i in "${ADDITIONAL_ROUTES[@]}"; do
|
||||
if ! add_default "$i"; then
|
||||
add_route "$i"
|
||||
fi
|
||||
add_route "$i"
|
||||
done
|
||||
[[ $(type -t post_add) != function ]] || post_add
|
||||
trap - INT TERM EXIT
|
||||
|
|
@ -148,7 +144,6 @@ cmd_add() {
|
|||
cmd_del() {
|
||||
auto_su
|
||||
[[ $(type -t pre_del) != function ]] || pre_del
|
||||
killall tungate 2>/dev/null || true
|
||||
[[ -n $CONFIG_FILE ]] && save_config
|
||||
del_if
|
||||
[[ $(type -t post_del) != function ]] || post_del
|
||||
|
|
|
|||
Loading…
Reference in a new issue