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{ config, hostName, lib, pkgs, ... }:
with lib;
let
listenPort = 51820;
subnet = "2a03:4000:52:ada:1";
subnetLength = 80;
links = [
{ from = "vidhar";
to = "surtr";
endpointHost = "surtr.yggdrasil.li";
persistentKeepalive = 25;
dynamicEndpointRefreshSeconds = 86400;
}
];
hostLength = subnetLength + 16;
hostIPs = {
surtr = ["${subnet}::/${toString hostLength}"];
vidhar = ["${subnet}:1::/${toString hostLength}"];
};
mkPublicKeyPath = host: ./hosts + "/${host}.pub";
mkPrivateKeyPath = host: ./hosts + "/${host}.priv";
publicKeyPath = mkPublicKeyPath hostName;
privateKeyPath = mkPrivateKeyPath hostName;
inNetwork = pathExists privateKeyPath && pathExists publicKeyPath;
hostLinks = filter ({ from, to, ... }: from == hostName || to == hostName) links;
linkToPeer = opts@{from, to, ...}:
let
other = if from == hostName then to else from;
in {
allowedIPs = hostIPs.${other};
publicKey = trim (readFile (mkPublicKeyPath other));
} // (optionalAttrs (from == hostName) (filterAttrs (n: _v: !(elem n ["from" "to" "endpointHost"])) opts // optionalAttrs (opts ? "endpointHost") { endpoint = "${opts.endpointHost}:${toString listenPort}"; }));
trim = str: if hasSuffix "\n" str then trim (removeSuffix "\n" str) else str;
stripSubnet = addr: let matchRes = builtins.match "^(.*)/[0-9]+$" addr; in if matchRes == null then addr else elemAt matchRes 0;
in {
config = {
assertions = [
{ assertion = inNetwork || !(pathExists privateKeyPath || pathExists publicKeyPath);
message = "yggdrasil-wg: Either both public and private keys must exist or neither.";
}
{ assertion = !inNetwork || (hostIPs ? "${hostName}");
message = "yggdrasil-wg: Entry in hostIPs must exist.";
}
] ++ map ({from, to, ...}: let other = if from == hostName then to else from; in { assertion = pathExists (mkPublicKeyPath other); message = "yggdrasil-wg: This host (${hostName}) has a link with ‘${other}’, but no public key is available for ‘${other}’."; }) hostLinks;
networking.wireguard.interfaces = mkIf inNetwork {
yggdrasil = {
allowedIPsAsRoutes = false;
inherit listenPort;
ips = hostIPs.${hostName};
peers = map linkToPeer hostLinks;
privateKeyFile = config.sops.secrets."yggdrasil-wg.priv".path;
postSetup = ''
${pkgs.iproute2}/bin/ip route replace "${subnet}/${toString subnetLength}" dev "yggdrasil" table "main"
'';
};
};
sops.secrets = mkIf (pathExists privateKeyPath) {
"yggdrasil-wg.priv" = {
format = "binary";
sopsFile = privateKeyPath;
};
};
networking.hosts = mkIf inNetwork (listToAttrs (concatMap ({name, value}: map (ip: nameValuePair (stripSubnet ip) ["${name}.yggdrasil"]) value) (mapAttrsToList nameValuePair hostIPs)));
};
}
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