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{ config, pkgs, ... }:
let
hostname = config.networking.hostName;
conf = hosts."${hostname}";
privateKeyPath = ./secrets/wireguard/${hostname}.txt;
lib = pkgs.lib;
wgPort = 51820; # Common port used on all peers
firewallMark = 42;
hosts = {
sagittarius = {
address = "2301:db8:acad:a::1/128";
publicKey = "GrrN8j9ZlPjTU5sQD4l8RDCGAn2YYszbSIE1zuG4OiI=";
endpoint = "95.216.136.85:${toString wgPort}";
};
nyaan = {
address = "2301:db8:acad:a::2/128";
publicKey = "u5nh+YNV84IbS7g0ncfs/V+cqEudNh500LQ7pmdS7j0=";
};
};
generatePeer =
hostname: values:
{
PublicKey = values.publicKey;
AllowedIPs = [ values.address ];
}
// lib.optionalAttrs (builtins.hasAttr "endpoint" values) {
Endpoint = values.endpoint;
PersistentKeepalive = 1;
};
generatePeers =
hostname:
let
peers = lib.attrsets.filterAttrs (k: v: k != hostname) hosts;
in
lib.attrsets.mapAttrsToList generatePeer peers;
in
{
sops.secrets."wireguard-${hostname}-pk" = {
sopsFile = privateKeyPath;
owner = "systemd-network";
group = "systemd-network";
mode = "0640";
format = "binary";
};
services.resolved.settings.Resolve.MulticastDNS = false;
systemd.network = {
enable = true;
networks."50-wg" = {
matchConfig.Name = "wg0";
address = [ conf.address ];
};
netdevs."50-wg" = {
netdevConfig = {
Kind = "wireguard";
Name = "wg0";
};
wireguardConfig = {
ListenPort = wgPort;
PrivateKeyFile = config.sops.secrets."wireguard-${hostname}-pk".path;
# To automatically create routes for everything in AllowedIPs,
# add RouteTable=main
RouteTable = "main";
# FirewallMark marks all packets send and received by wg0 with the
# number, which can be used to define policy rules on these packets.
FirewallMark = firewallMark;
};
wireguardPeers = generatePeers hostname;
};
};
services.avahi = {
enable = true;
nssmdns6 = true;
reflector = true;
allowInterfaces = [ "wg0" ];
publish = {
enable = true;
addresses = true;
workstation = true;
};
};
}
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