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{ config, pkgs, ... }:
let
wgPort = 51820; # Common port used on all peers
firewallMark = 42;
inherit (pkgs) lib;
inherit (lib.attrsets)
mapAttrsToList;
# The topology is hub-and-spoke/star
# sagittarius is the hub == 2301:db8:acad:a::1
# it hosts authoritative DNS and spokes do keepalive with it.
hub = {
hostName = "sagittarius";
address = "2301:db8:acad:a::1/128";
publicKey = "GrrN8j9ZlPjTU5sQD4l8RDCGAn2YYszbSIE1zuG4OiI=";
endpoint = "95.216.136.85:${toString wgPort}";
};
spokes = {
nyaan = {
address = "2301:db8:acad:a::2/128";
publicKey = "u5nh+YNV84IbS7g0ncfs/V+cqEudNh500LQ7pmdS7j0=";
};
pixel8 = {
address = "2301:db8:acad:a::3/128";
publicKey = "awBcQzNBdlYWpoOF1n7ijol2EiaJy5cxrVXfrqCvM0k=";
};
underworld = {
address = "2301:db8:acad:a::4/128";
publicKey = "GPVOvXqg8rp1a38T6YDHQN6UkG2TJT399A4wNtK4WTM=";
};
};
generatePeer =
hostname: values:
{
PublicKey = values.publicKey;
AllowedIPs = [ values.address ];
}
// lib.optionalAttrs (builtins.hasAttr "endpoint" values) {
Endpoint = values.endpoint;
PersistentKeepalive = 1;
};
hubPeers = mapAttrsToList generatePeer spokes;
spokePeers = [
{
PublicKey = hub.publicKey;
AllowedIPs = [ "2301:db8:acad:a::/64" ];
Endpoint = hub.endpoint;
PersistentKeepalive = 10;
}
];
hostname = config.networking.hostName;
isHub = hostname == hub.hostName;
conf = if isHub then hub else spokes."${hostname}";
privateKeyPath = ./secrets/wireguard/${hostname}.txt;
in
{
sops.secrets."wireguard-${hostname}-pk" = {
sopsFile = privateKeyPath;
owner = "systemd-network";
group = "systemd-network";
mode = "0640";
format = "binary";
};
networking.nameservers = [
"2301:db8:acad:a::1" # see the zonefile in etc/dns
];
systemd.network = {
enable = true;
networks."50-wg" = {
matchConfig.Name = "wg0";
address = [ conf.address ];
networkConfig = lib.mkIf isHub {
IPv6Forwarding = true;
IPv6AcceptRA = false; # Disable RA acceptance on router interfaces
};
};
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 = if isHub then hubPeers else spokePeers;
};
};
boot.kernel.sysctl = lib.mkIf isHub {
# I *think* this should be fine since networkd will prevent forwarding
# on any interface that doesn't have IPv6Forwarding set to true.
"net.ipv6.conf.wg0.forwarding" = true;
};
}
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