92 lines
No EOL
3.5 KiB
Nix
92 lines
No EOL
3.5 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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# Import nodes
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nodes = import ./../../nodes.nix;
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myPeer = nodes."${config.hostName}";
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myId = myPeer.id;
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myZone = myPeer.zone;
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# And mappings
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mapping = import ./../../mapping.nix;
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buildSecret = zone: id: {
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"wg-private-zone-${toString zone}-id-${toString id}" = {
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file = ./../../secrets/wireguard + ( "/wg-private-zone-" + toString zone + "-id-" + toString id + ".age" );
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owner = "root";
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group = "root";
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};
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};
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generatedSecrets = lib.mapAttrsToList (name: node: buildSecret node.zone node.id) nodes;
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# Filter itself out of the peer list
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peerConfigs = lib.filterAttrs (_peerName: peerConfig: (peerConfig.zone != myZone) || (peerConfig.id != myId)) nodes;
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peers = lib.mapAttrsToList (peerName: peerConfig: {
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name = "${peerName}";
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publicKey = peerConfig.wg-pub;
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allowedIPs = [
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"172.19.${toString peerConfig.zone}.${toString peerConfig.id}/32"
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"fc00::${toString peerConfig.zone}:${toString peerConfig.id}/128"
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] ++ lib.optionals (lib.elem peerName mapping.bastion) [
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"172.19.${toString (peerConfig.zone + 127)}.0/24"
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"fc00:f::${toString (peerConfig.zone + 127)}:0/112"
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];
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endpoint = "${builtins.head (builtins.split "/" peerConfig.ip4)}:51820";
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persistentKeepalive = 25;
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}) peerConfigs;
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interfaces = {
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"mesh" = {
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ips = [
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"172.19.${toString myZone}.${toString myId}/17"
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"fc00::${toString myZone}:${toString myId}/112"
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];
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privateKeyFile = config.age.secrets."wg-private-zone-${toString myZone}-id-${toString myId}".path;
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listenPort = 51820;
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peers = peers;
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};
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};
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generateRoute = peerName: peerConfig: ''
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# Return path for mgmt trafic
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${if lib.elem peerName mapping.bastion then ''
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${pkgs.iproute2}/bin/ip route replace 172.19.${toString (peerConfig.zone + 127)}.0/24 via 172.19.${toString peerConfig.zone}.${toString peerConfig.id} dev mesh
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${pkgs.iproute2}/bin/ip -6 route replace fc00:f::${toString (peerConfig.zone + 127)}:0/112 via fc00::${toString peerConfig.zone}:${toString peerConfig.id} dev mesh
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'' else ""}
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'';
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generateAfter = peerName: peerConfig: "wireguard-mesh.target";
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routes = lib.mapAttrsToList (name: peer: generateRoute name peer) peerConfigs;
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afters = lib.mapAttrsToList (name: peer: generateAfter name peer) peerConfigs;
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wireguardStaticRoute = pkgs.writeShellScriptBin "wireguardStaticRoute" ''
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${lib.concatStrings routes}
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'';
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in
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{
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age.secrets = lib.lists.foldl' (acc: set: lib.attrsets.recursiveUpdate acc set) {} generatedSecrets;
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# Networkd backend introduce in 25.05
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# No independant target are generated
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# when using networkd as a backend
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# We need them, see below
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networking.wireguard.useNetworkd = false;
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# Return all WireGuard interfaces for each node
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networking.wireguard.interfaces = interfaces;
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# Execute custom routing for wireguard
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systemd.services.wireguardStaticRouting = {
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wantedBy = [ "multi-user.target" ];
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# Thus we need specific target to be reached to run it
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after = afters;
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description = "Add custom ip route for wireguard.";
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serviceConfig = {
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Type = "oneshot";
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User = "root";
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ExecStart = "${wireguardStaticRoute}/bin/wireguardStaticRoute";
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};
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};
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} |