91 lines
2.5 KiB
Nix
91 lines
2.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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hostname = config.instance.hostname;
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host = config.fudo.hosts.${hostname};
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host-secrets = config.fudo.secrets.host-secrets.${hostname};
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cfg = config.fudo.services.wireguard-gateway;
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peerOpts = { name, ... }: {
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options = with types; {
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public-key = mkOption {
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type = str;
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description = "Peer public key.";
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};
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assigned-ip = mkOption {
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type = str;
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description = "IP address assigned to this peer.";
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};
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};
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};
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in {
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options.fudo.services.wireguard-gateway = with types; {
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enable = mkEnableOption "Enable WireGuard gateway: let external clients join the local network.";
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network = mkOption {
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type = str;
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description = "IP address range to use for clients.";
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default = "172.16.0.0/24";
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};
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listen-port = mkOption {
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type = port;
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description = "Port on which to listen for incoming connections.";
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default = 51820;
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};
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peers = mkOption {
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type = attrsOf (submodule peerOpts);
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description = "Map of peer to peer options.";
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default = {};
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};
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};
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config = mkIf cfg.enable {
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assertions = [
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{
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assertion = all (peerOpts:
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pkgs.lib.ip.ipv4OnNetwork peerOpts.assigned-ip cfg.network)
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(attrValues cfg.peers);
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message = "Peer IPs must be on the assigned network.";
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}
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{
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assertion = host.wireguard.private-key-file != null;
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message = "WireGuard gateway server private key file must be set.";
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}
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];
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fudo.secrets.host-secrets.${hostname} = {
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wireguard-gateway-privkey-file = {
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source-file = host.wireguard.private-key-file;
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target-file = "/run/wireguard-gateway/key";
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};
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};
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networking = {
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firewall.allowedUDPPorts = [ cfg.listen-port ];
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wireguard.interfaces.wg-gw0 = {
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ips = [ cfg.network ];
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listenPort = cfg.listen-port;
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postSetup =
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"${pkgs.iptables}/bin/iptables -t nat -A POSTROUTING -s ${cfg.network} -o ${cfg.external-interface} -j MASQUERADE";
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postShutdown =
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"${pkgs.iptables}/bin/iptables -t nat -D POSTROUTING -s ${cfg.network} -o ${cfg.external-interface} -j MASQUERADE";
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privateKeyFile = host-secrets.wireguard-gateway-privkey-file.target-file;
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peers = let
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peerList = attrValues cfg.peers;
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in map (peerOpts: {
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publicKey = peerOpts.public-key;
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allowedIPs = [ "${peerOpts.ip}/32" ];
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}) cfg.peers;
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};
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};
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};
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}
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