fuji/wireguard: separate into discrete module

fuji/configuration.nix

@@ -10,7 +10,7 @@ let
   USER = "akill";
 in
 {
-  imports = [ ];
+  imports = [ ./wireguard.nix ];
 
   system = {
     stateVersion = "23.05";
@@ -29,22 +29,6 @@ in
         group = config.users.users.nobody.group;
       };
 
-      "wg_privkey" = {
-        sopsFile = ./secrets/wg_privkey.yaml;
-      };
-
-      "wg_preshared/nixy" = {
-        sopsFile = ../common/secrets/wg_preshared.yaml;
-      };
-
-      "wg_privkey_proton" = {
-        sopsFile = ./secrets/wg_privkey_proton.yaml;
-      };
-
-      "wg_endpoint_proton" = {
-        sopsFile = ./secrets/wg_privkey_proton.yaml;
-      };
-
       "borgbase_enc_key" = {
         sopsFile = ./secrets/borgbase_enc_key.yaml;
         owner = config.users.users.${USER}.name;
@@ -199,21 +183,6 @@ in
       };
     };
 
-    wireguard.interfaces = {
-      wg0 = {
-        ips = [ "10.100.0.6/24" ];
-        privateKeyFile = config.sops.secrets."wg_privkey".path;
-        peers = [
-          {
-            publicKey = builtins.readFile ../magpie/wg_pubkey;
-            presharedKeyFile = config.sops.secrets."wg_preshared/nixy".path;
-            allowedIPs = [ "10.100.0.0/24" ];
-            endpoint = "5.75.229.224:51820";
-            persistentKeepalive = 25;
-          }
-        ];
-      };
-    };
   };
 
   time.timeZone = "Europe/Sarajevo";
@@ -311,106 +280,7 @@ in
         };
       };
 
-      "netns@" = {
-        description = "%I network namespace";
-        before = [ "network.target" ];
-        serviceConfig = {
-          Type = "oneshot";
-          RemainAfterExit = true;
-          ExecStart = "${pkgs.iproute2}/bin/ip netns add %I";
-          ExecStop = "${pkgs.iproute2}/bin/ip netns del %I";
     };
-      };
-
-      "wg_proton" = {
-        description = "wg network interface";
-        bindsTo = [ "netns@wg.service" ];
-        requires = [ "network-online.target" ];
-        wants = [ "dnscrypt-proxy_proton.service" ];
-        after = [ "netns@wg.service" ];
-        before = [ "dnscrypt-proxy_proton.service" ];
-        serviceConfig = {
-          Type = "oneshot";
-          RemainAfterExit = true;
-          ExecStart = pkgs.writers.writeBash "wg-up" ''
-            set -e
-            ENDPOINT_IP=$(${pkgs.coreutils-full}/bin/cat "${config.sops.secrets."wg_endpoint_proton".path}")
-            ${pkgs.iproute2}/bin/ip link add proton_wg type wireguard
-            ${pkgs.iproute2}/bin/ip link set proton_wg netns wg
-            ${pkgs.iproute2}/bin/ip -n wg address add 10.2.0.2/32 dev proton_wg
-            ${pkgs.iproute2}/bin/ip netns exec wg \
-              ${pkgs.wireguard-tools}/bin/wg set "proton_wg" private-key "${
-                config.sops.secrets."wg_privkey_proton".path
-              }"
-            ${pkgs.iproute2}/bin/ip netns exec wg \
-              ${pkgs.wireguard-tools}/bin/wg set "proton_wg" peer "g6DkXWKI/68RsLjROIwCEcyB/ZhyK5Q7OWcz1TtqER0=" \
-                endpoint "$ENDPOINT_IP:51820" \
-                persistent-keepalive "25" \
-                allowed-ips "0.0.0.0/0"
-            ${pkgs.iproute2}/bin/ip -n wg link set lo up
-            ${pkgs.iproute2}/bin/ip -n wg link set proton_wg up
-            ${pkgs.iproute2}/bin/ip -n wg route add default dev proton_wg
-          '';
-          ExecStop = pkgs.writers.writeBash "wg-down" ''
-            ${pkgs.iproute2}/bin/ip -n wg route del default dev proton_wg
-            ${pkgs.iproute2}/bin/ip -n wg link del proton_wg
-          '';
-        };
-      };
-
-      "dnscrypt-proxy_proton" = {
-        description = "DNSCrypt-proxy client proton";
-        wants = [
-          "network-online.target"
-          "nss-lookup.target"
-        ];
-        before = [ "nss-lookup.target" ];
-        after = [ "wg_proton.service" ];
-        partOf = [ "wg_proton.service" ];
-        serviceConfig = {
-          AmbientCapabilities = "CAP_NET_BIND_SERVICE";
-          CacheDirectory = "dnscrypt-proxy";
-          DynamicUser = true;
-          ExecStart = "${pkgs.dnscrypt-proxy}/bin/dnscrypt-proxy -config ${config.services.dnscrypt-proxy.configFile}";
-          LockPersonality = true;
-          LogsDirectory = "dnscrypt-proxy";
-          MemoryDenyWriteExecute = true;
-          NetworkNamespacePath = "/var/run/netns/wg";
-          NonBlocking = true;
-          NoNewPrivileges = true;
-          PrivateDevices = true;
-          ProtectClock = true;
-          ProtectControlGroups = true;
-          ProtectHome = true;
-          ProtectHostname = true;
-          ProtectKernelLogs = true;
-          ProtectKernelModules = true;
-          ProtectKernelTunables = true;
-          ProtectSystem = "strict";
-          Restart = "always";
-          RestrictAddressFamilies = [
-            "AF_INET"
-            "AF_INET6"
-          ];
-          RestrictNamespaces = true;
-          RestrictRealtime = true;
-          RuntimeDirectory = "dnscrypt-proxy";
-          StateDirectory = "dnscrypt-proxy";
-          SystemCallArchitectures = "native";
-          SystemCallFilter = [
-            "@system-service"
-            "@chown"
-            "~@aio"
-            "~@keyring"
-            "~@memlock"
-            "~@setuid"
-            "~@timer"
-          ];
-        };
-      };
-    };
-
-    targets."wireguard-wg0".wantedBy = lib.mkForce [ ];
 
     coredump.enable = false;
     settings.Manager = {

fuji/wireguard.nix

@@ -0,0 +1,149 @@
+{ config
+, pkgs
+, lib
+, ...
+}:
+{
+  sops.secrets = {
+    "wg_privkey" = {
+      sopsFile = ./secrets/wg_privkey.yaml;
+    };
+
+    "wg_preshared/nixy" = {
+      sopsFile = ../common/secrets/wg_preshared.yaml;
+    };
+
+    "wg_privkey_proton" = {
+      sopsFile = ./secrets/wg_privkey_proton.yaml;
+    };
+
+    "wg_endpoint_proton" = {
+      sopsFile = ./secrets/wg_privkey_proton.yaml;
+    };
+  };
+
+  # Personal mesh: dials into the magpie hub (10.100.0.0/24)
+  networking.wireguard.interfaces = {
+    wg0 = {
+      ips = [ "10.100.0.6/24" ];
+      privateKeyFile = config.sops.secrets."wg_privkey".path;
+      peers = [
+        {
+          publicKey = builtins.readFile ../magpie/wg_pubkey;
+          presharedKeyFile = config.sops.secrets."wg_preshared/nixy".path;
+          allowedIPs = [ "10.100.0.0/24" ];
+          endpoint = "5.75.229.224:51820";
+          persistentKeepalive = 25;
+        }
+      ];
+    };
+  };
+
+  systemd = {
+    services = {
+      # ProtonVPN split tunnel: proton_wg lives inside the `wg` network
+      # namespace; anything that should egress over Proton is launched
+      # with `ip netns exec wg ...`.
+      "netns@" = {
+        description = "%I network namespace";
+        before = [ "network.target" ];
+        serviceConfig = {
+          Type = "oneshot";
+          RemainAfterExit = true;
+          ExecStart = "${pkgs.iproute2}/bin/ip netns add %I";
+          ExecStop = "${pkgs.iproute2}/bin/ip netns del %I";
+        };
+      };
+
+      "wg_proton" = {
+        description = "wg network interface";
+        bindsTo = [ "netns@wg.service" ];
+        requires = [ "network-online.target" ];
+        wants = [ "dnscrypt-proxy_proton.service" ];
+        after = [ "netns@wg.service" ];
+        before = [ "dnscrypt-proxy_proton.service" ];
+        serviceConfig = {
+          Type = "oneshot";
+          RemainAfterExit = true;
+          ExecStart = pkgs.writers.writeBash "wg-up" ''
+            set -e
+            ENDPOINT_IP=$(${pkgs.coreutils-full}/bin/cat "${config.sops.secrets."wg_endpoint_proton".path}")
+            ${pkgs.iproute2}/bin/ip link add proton_wg type wireguard
+            ${pkgs.iproute2}/bin/ip link set proton_wg netns wg
+            ${pkgs.iproute2}/bin/ip -n wg address add 10.2.0.2/32 dev proton_wg
+            ${pkgs.iproute2}/bin/ip netns exec wg \
+              ${pkgs.wireguard-tools}/bin/wg set "proton_wg" private-key "${
+                config.sops.secrets."wg_privkey_proton".path
+              }"
+            ${pkgs.iproute2}/bin/ip netns exec wg \
+              ${pkgs.wireguard-tools}/bin/wg set "proton_wg" peer "${lib.fileContents ../common/wg_pubkey_proton}" \
+                endpoint "$ENDPOINT_IP:51820" \
+                persistent-keepalive "25" \
+                allowed-ips "0.0.0.0/0"
+            ${pkgs.iproute2}/bin/ip -n wg link set lo up
+            ${pkgs.iproute2}/bin/ip -n wg link set proton_wg up
+            ${pkgs.iproute2}/bin/ip -n wg route add default dev proton_wg
+          '';
+          ExecStop = pkgs.writers.writeBash "wg-down" ''
+            ${pkgs.iproute2}/bin/ip -n wg route del default dev proton_wg
+            ${pkgs.iproute2}/bin/ip -n wg link del proton_wg
+          '';
+        };
+      };
+
+      "dnscrypt-proxy_proton" = {
+        description = "DNSCrypt-proxy client proton";
+        wants = [
+          "network-online.target"
+          "nss-lookup.target"
+        ];
+        before = [ "nss-lookup.target" ];
+        after = [ "wg_proton.service" ];
+        partOf = [ "wg_proton.service" ];
+        serviceConfig = {
+          AmbientCapabilities = "CAP_NET_BIND_SERVICE";
+          CacheDirectory = "dnscrypt-proxy";
+          DynamicUser = true;
+          ExecStart = "${pkgs.dnscrypt-proxy}/bin/dnscrypt-proxy -config ${config.services.dnscrypt-proxy.configFile}";
+          LockPersonality = true;
+          LogsDirectory = "dnscrypt-proxy";
+          MemoryDenyWriteExecute = true;
+          NetworkNamespacePath = "/var/run/netns/wg";
+          NonBlocking = true;
+          NoNewPrivileges = true;
+          PrivateDevices = true;
+          ProtectClock = true;
+          ProtectControlGroups = true;
+          ProtectHome = true;
+          ProtectHostname = true;
+          ProtectKernelLogs = true;
+          ProtectKernelModules = true;
+          ProtectKernelTunables = true;
+          ProtectSystem = "strict";
+          Restart = "always";
+          RestrictAddressFamilies = [
+            "AF_INET"
+            "AF_INET6"
+          ];
+          RestrictNamespaces = true;
+          RestrictRealtime = true;
+          RuntimeDirectory = "dnscrypt-proxy";
+          StateDirectory = "dnscrypt-proxy";
+          SystemCallArchitectures = "native";
+          SystemCallFilter = [
+            "@system-service"
+            "@chown"
+            "~@aio"
+            "~@keyring"
+            "~@memlock"
+            "~@setuid"
+            "~@timer"
+          ];
+        };
+      };
+    };
+
+    # Don't bring wg0 up at boot
+    targets."wireguard-wg0".wantedBy = lib.mkForce [ ];
+  };
+}