wireguard: add ehex vpn

hosts/stroopwafel/networking.nix

@@ -41,4 +41,13 @@
     ];
     privateKeyFile = config.age.secrets.wg-pub-solar-key.path;
   };
+
+  age.secrets.wg-ehex-key.file = "${flake.self}/secrets/wg-ehex-stroopwafel.age";
+
+  pub-solar.wireguard.ehex = {
+    ownIPs = [
+			"10.42.0.135/22"
+    ];
+    privateKeyFile = config.age.secrets.wg-ehex-key.path;
+  };
 }

modules/wireguard/default.nix

@@ -8,5 +8,6 @@
     ./private.nix
     ./tunnel.nix
     ./pub.solar.nix
+    ./ehex.nix
   ];
 }

modules/wireguard/ehex.nix

@@ -0,0 +1,74 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+with lib; let
+  psCfg = config.pub-solar;
+  cfg = config.pub-solar.wireguard.ehex;
+in {
+  options.pub-solar.wireguard.ehex = {
+    ownIPs = mkOption {
+      description = "Internal ips in wireguard used for cluster control-plane communication.";
+      type = types.listOf types.str;
+      default = [];
+    };
+
+    privateKeyFile = mkOption {
+      description = "Location of private key file";
+      type = types.path;
+    };
+  };
+
+  config = mkIf (length cfg.ownIPs != 0){
+    networking.firewall.allowedUDPPorts = [51822];
+
+    systemd.network.wait-online.ignoredInterfaces = [ "wg-ehex" ];
+
+    systemd.services.wireguard-wg-ehex = {
+      after = [
+        "network.target"
+        "network-online.target"
+        "nss-lookup.target"
+      ];
+
+      serviceConfig = {
+        Type = mkForce "simple";
+        Restart = "on-failure";
+        RestartSec = "30";
+      };
+
+      environment = {
+        WG_ENDPOINT_RESOLUTION_RETRIES = "infinity";
+      };
+    };
+
+    networking.wireguard.interfaces = {
+      wg-ehex = {
+        listenPort = 51821;
+        mtu = 1300;
+        ips = cfg.ownIPs;
+        privateKeyFile = cfg.privateKeyFile;
+        postSetup = '' 
+          printf "nameserver 10.0.66.10\nnameserver 10.0.66.12" | resolvconf -a wg-ehex -m 0 -x
+        '';
+        postShutdown = ''
+          resolvconf -d wg-ehex -f
+        '';
+        peers = [
+          {
+            endpoint = "vpn-gateway.ehex.de:4242";
+            publicKey = "Fsg4KEyDEvQEt/1cVWU9xa/k9x/3UhONDj61aXZ7tys=";
+						presharedKey = "tQy7B5R3wOgWwIKFDcEr4WZIqCrwG+9UgPRIQx/5xso=";
+            allowedIPs = [ "10.42.0.0/22" "10.0.66.0/24" ];
+            persistentKeepalive = 15;
+            dynamicEndpointRefreshSeconds = 30;
+# DNS = 10.0.66.10, ehex.cloud,ehex.de
+# DNS = 10.0.66.12, ehex.cloud,ehex.de
+          }
+        ];
+      };
+    };
+  };
+}

secrets/secrets.nix

@@ -93,6 +93,8 @@ in {
 
   "wg-pub-solar-stroopwafel.age".publicKeys = stroopwafelKeys ++ baseKeys;
 
+  "wg-ehex-stroopwafel.age".publicKeys = stroopwafelKeys ++ baseKeys;
+
   "invoiceplane-db-password.age".publicKeys = pieKeys ++ baseKeys;
   "invoiceplane-db-secrets.env.age".publicKeys = pieKeys ++ baseKeys;