qusal/salt/sys-wireguard/files/server/qubes-firewall.d/50-sys-wireguard-var

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#!/bin/sh
2024-01-29 10:49:54 -05:00
# SPDX-FileCopyrightText: 2023 - 2024 Benjamin Grande M. S. <ben.grande.b@gmail.com>
#
# SPDX-License-Identifier: AGPL-3.0-or-later
set -eu
wg_conf="/etc/wireguard/wireguard.conf"
nft_conf="/var/run/wireguard/dnat.nft"
mkdir -p "${nft_conf%/*}"
rm -f "${nft_conf}"
touch "${nft_conf}"
set_nft(){
echo "${*}" | tee -a "${nft_conf}" >/dev/null
}
set_nft_dnat(){
ipv="${1}" # empty(4), 6
proto="${2}" # tcp, udp
dns_host="${3}"
rule_prefix="insert rule ip${ipv} qubes custom-dnat iifgroup 2 ${proto}"
rule_suffix="dport 53 dnat to ${dns_host}"
set_nft "${rule_prefix} ${rule_suffix}"
}
dns="$(grep -s "^\s*DNS\s*=\s*\S\+" "${wg_conf}" | sed "s/.*=//;s/ //g")"
if test -z "${dns}"; then
set_nft "insert rule ip qubes custom-dnat drop"
set_nft "insert rule ip6 qubes custom-dnat drop"
exit
fi
dns_primary="$(echo "${dns}" | cut -d "," -f 1)"
dns_secondary="$(echo "${dns}" | cut -d "," -f 2)"
dns_primary_ipv=""
if echo "${dns_primary}" | grep -qF ":"; then
dns_primary_ipv=6
fi
dns_secondary_ipv=""
if echo "${dns_secondary}" | grep -qF ":"; then
dns_secondary_ipv=6
fi
if test -n "${dns}"; then
set_nft_dnat "${dns_primary_ipv}" udp "${dns_primary}"
set_nft_dnat "${dns_primary_ipv}" tcp "${dns_primary}"
if echo "${dns}" | grep -qF ","; then
set_nft_dnat "${dns_secondary_ipv}" udp "${dns_secondary}"
set_nft_dnat "${dns_secondary_ipv}" tcp "${dns_secondary}"
fi
fi
ln -sf /run/resolvconf/resolv.conf /etc/resolv.conf