WireGuard setup

• Add to /etc/rc.d/rc.firewall:

# Allow wireguard
$ipt -A INPUT -i eth0 -p udp --dport 51820 -j ACCEPT
$ipt -A INPUT -i wg0 -j ACCEPT
$ipt -A FORWARD -i wg0 -o eth0 -j ACCEPT
$ipt -A FORWARD -i eth0 -o wg0 -j ACCEPT
$ipt -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE

• # sysctl -w net.ipv4.ip_forward=1

• add net.ipv4.ip_forward=1 to /etc/sysctl.conf

• # touch /etc/wireguard/private.key
• # chmod 400 /etc/wireguard/private.key
• # wg genkey > /etc/wireguard/private.key
• # wg pubkey < /etc/wireguard/private.key > /etc/wireguard/public.key
• /etc/wireguard/wg0.conf

[Interface]
Address = 10.8.0.1/24
ListenPort = 51820
PrivateKey = <private key>

[Peer]
# Alice
PublicKey = <Alice's public key>
AllowedIPs = 10.8.0.2/32

[Peer]
# Bob
PublicKey = <Bob's public key>
AllowedIPs = 10.8.0.3/32

• # chmod 400 /etc/wireguard/wg0.conf
• /etc/rc.d/rc.wg

#!/bin/bash
# Start/stop/restart WireGuard.

wg_start() {
  if [ -r /run/wireguard.pid ]; then
    echo "WireGuard already running as pid $(cat /run/wireguard.pid)!"
    return
  fi
  echo -n "Starting WireGuard:  /usr/bin/wg-quick up wg0"
  /usr/bin/wg-quick up wg0
  grep "^wg-crypt-wg0" /proc/*/comm \
    | sed 's,^/proc/,,;s,/.*,,' > /run/wireguard.pid
  echo
}

wg_stop() {
  echo -n "Stopping WireGuard:  /usr/bin/wg-quick down wg0"
    /usr/bin/wg-quick down wg0
    rm -f /run/wireguard.pid
  echo
}

wg_restart() {
  wg_stop
  sleep 1
  wg_start
}

wg_status() {
  if [ -r /run/wireguard.pid ]; then
    echo "WireGuard is running as pid $(cat /run/wireguard.pid)."
    echo
    /usr/bin/wg show
  else
    echo "WireGuard is stopped."
    exit 1
  fi
}

case "$1" in
'start')
  wg_start
  ;;
'stop')
  wg_stop
  ;;
'restart')
  wg_restart
  ;;
'status')
  wg_status
  ;;
*)
  echo "usage $0 start|stop|restart|status"
esac

• chmod +x /etc/rc.d/rc.wg
• /etc/rc.d/rc.local

# Start WireGuard
if [ -x /etc/rc.d/rc.wg ]; then
  /etc/rc.d/rc.wg start
fi

• /etc/rc.d/rc.local_shutdown

# Stop WireGuard
if [ -x /etc/rc.d/rc.wg ]; then
  /etc/rc.d/rc.wg stop
fi