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nixfiles/modules/wireguard-initrd/default.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.boot.initrd.network.wireguard;
in
{
options = {
boot.initrd.network.wireguard = {
enable = mkEnableOption "Wireguard in initrd";
privateKeyFile = mkOption {
type = with types; nullOr str;
default = null;
description = "Path to file containing private key for wireguard interface";
};
ipv6s = mkOption {
type = with types; listOf str;
default = [];
description = "IPv6 interface addresses";
};
ipv4s = mkOption {
type = with types; listOf str;
default = [];
description = "IPv4 interface addresses";
};
};
};
config = mkIf cfg.enable {
boot.initrd.kernelModules = [ "wireguard" ];
boot.initrd.extraUtilsCommands = ''
for BIN in ${pkgs.iproute2}/bin/*; do
copy_bin_and_libs $BIN
done
[ -f "$out/bin/wg" ] && rm "$out/bin/wg"
cp -pdv ${pkgs.wireguard-tools}/bin/.wg-wrapped $out/bin/wg
'';
boot.initrd.network.postCommands = ''
ip link add dev "wg-initrd" type wireguard
ip link set "wg-initrd" mtu 1280
${concatMapStringsSep "\n" (ip: ''
ip address add "${ip}" dev "wg-initrd"
'') cfg.ipv6s}
${concatMapStringsSep "\n" (ip: ''
ip address add "${ip}" dev "wg-initrd"
'') cfg.ipv4s}
wg set "wg-initrd" private-key "/var/src/secrets/wireguard/wg-initrd"
ip link set up "wg-initrd"
wg set "wg-initrd" peer "2p1Jqs3bkXbXHFWE6vp1yxHIFoUaZQEARS2nJzbkuBA=" \
endpoint "$(ip route get 2a01:4f8:c0c:15f1::1 ipproto udp dport 51820 &>/dev/null && echo '[2a01:4f8:c0c:15f1::1]:51820' || echo '78.47.183.82:51820')" \
persistent-keepalive "25" \
allowed-ips "0.0.0.0/0,::/0,10.20.30.0/24,2a01:4f8:c0c:15f1::/113"
ip route add "::/0" dev "wg-initrd" table 1337
ip route add "0.0.0.0/0" dev "wg-initrd" table 1337
# Error: Argument "udp" is wrong: Invalid "ipproto" value
# For some reason ip rule does not recognize "udp" as a value for "ipproto" in initrd,
# so we pass the numeric value for it manually
# This is from linux/include/uapi/linux/in.h
IPPROTO_UDP=17
${concatMapStringsSep "\n" (ip: ''
ip -6 rule add from "${ip}" lookup 1337 prio 19000
ip -6 rule add from "${ip}" unreachable prio 19001
'') cfg.ipv6s}
ip -6 rule add to "2a01:4f8:c0c:15f1::1/128" ipproto $IPPROTO_UDP dport 51820 lookup main prio 20000
ip -6 rule add to "2a01:4f8:c0c:15f1::1/128" ipproto $IPPROTO_UDP dport 51820 unreachable prio 20001
ip -6 rule add lookup main prio 21000
ip -6 rule add lookup 1337 prio 21001
ip -6 rule add unreachable prio 21000
${concatMapStringsSep "\n" (ip: ''
ip -4 rule add from "${ip}" lookup 1337 prio 19000
ip -4 rule add from "${ip}" unreachable prio 19001
'') cfg.ipv4s}
ip -4 rule add to "78.47.183.82/32" ipproto $IPPROTO_UDP dport 51820 lookup main prio 20000
ip -4 rule add to "78.47.183.82/32" ipproto $IPPROTO_UDP dport 51820 unreachable prio 20001
ip -4 rule add lookup main prio 21000
ip -4 rule add lookup 1337 prio 21001
ip -4 rule add unreachable prio 21000
'';
boot.initrd.postMountCommands = ''
ip link del dev "wg-initrd"
ip -6 rule flush
ip -4 rule flush
'';
boot.initrd.secrets = {
"/var/src/secrets/wireguard/wg-initrd" = cfg.privateKeyFile;
};
};
}