115 lines
No EOL
5 KiB
Nix
115 lines
No EOL
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-${toString id}" = {
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file = ./../../secrets/wireguard + ( "/wg-private-zone-" + toString zone + "-id-" + toString id + ".age" );
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owner = "root";
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group = "root";
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};
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};
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generatedSecrets = lib.mapAttrsToList (name: node: buildSecret node.zone node.id) nodes;
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shorten = peerName: let
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parts = lib.splitString "-" peerName;
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shortened = lib.concatStrings (map (part: lib.substring 0 1 part) parts);
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in shortened;
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# Filter itself out of the peer list
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peerConfigs = lib.filterAttrs (_peerName: peerConfig: peerConfig.id != myId) nodes;
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# We'll make one if per peer, this is more flexible
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interfacePeers = lib.flatten (lib.mapAttrsToList (peerName: peerConfig: let
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remoteId = peerConfig.id;
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remoteZone = peerConfig.zone;
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# The mesh is for now only IPv4 based
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if4 = {
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"mesh-${shorten peerName}-${toString remoteZone}-${toString remoteId}" = {
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ips = [
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"172.19.${toString remoteId}.${toString myId}/32"
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"fc00::${toString remoteId}:${toString myId}/128"
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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 = 51000 + remoteId;
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peers = [{
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name = "${peerName}-ip4";
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publicKey = peerConfig.wg-pub;
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allowedIPs = [
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"172.19.${toString myId}.${toString remoteId}/32"
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"fc00::${toString myId}:${toString remoteId}/128"
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# Allow mgmt transport
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"172.19.128.0/17"
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"fc00:f::/96"
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];
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persistentKeepalive = 25;
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}];
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# Throw away route created by wireguard
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table = "off";
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};
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};
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in if4) peerConfigs);
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wireguardInterfaces = builtins.foldl' (acc: set: acc // set) {} interfacePeers;
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generateRoute = peerName: peerConfig: ''
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# Static route to declare static wireguard peer inner tunnel ip (that has been thrown away to the "off" table)
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${pkgs.iproute2}/bin/ip route replace 172.19.${toString myId}.${toString peerConfig.id} dev mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id} scope link
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${pkgs.iproute2}/bin/ip -6 route replace fc00::${toString myId}:${toString peerConfig.id} dev mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id} scope link
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# Return path for mgmt trafic
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${if !(lib.elem myPeer mapping.bastion) && (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.${toString myPeer.id}.${toString peerConfig.id} dev mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id}
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${pkgs.iproute2}/bin/ip -6 route replace fc00:f::${toString (peerConfig.zone + 127)}:0/96 via fc00::${toString myPeer.id}:${toString peerConfig.id} dev mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id}
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'' else ""}
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'';
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generateAfter = peerName: peerConfig: "wireguard-mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id}.target";
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routes = lib.mapAttrsToList (name: peer: generateRoute name peer) peerConfigs;
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afters = lib.mapAttrsToList (name: peer: generateAfter name peer) peerConfigs;
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wireguardStaticRoute = pkgs.writeShellScriptBin "wireguardStaticRoute" ''
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${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 = wireguardInterfaces;
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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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# Open UDP port for wireguard traffic
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networking.firewall.allowedUDPPorts = lib.range 51000 (51000 + builtins.head (
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builtins.sort (a: b: a > b) (
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lib.mapAttrsToList (name: node: node.id) nodes)));
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} |