nixos/wg-quick: add AmneziaWG support

Co-authored-by: azahi <azat@bahawi.net>

nixos/modules/services/networking/wg-quick.nix

@@ -11,6 +11,15 @@ let
   interfaceOpts = { ... }: {
     options = {
 
+      type = mkOption {
+        example = "amneziawg";
+        default = "wireguard";
+        type = types.enum ["wireguard" "amneziawg"];
+        description = ''
+          The type of the interface. Currently only "wireguard" and "amneziawg" are supported.
+        '';
+      };
+
       configFile = mkOption {
         example = "/secret/wg0.conf";
         default = null;
@@ -151,6 +160,22 @@ let
         description = "Peers linked to the interface.";
         type = with types; listOf (submodule peerOpts);
       };
+
+      extraOptions = mkOption {
+        type = with types; attrsOf (oneOf [ str int ]);
+        default = { };
+        example = {
+          Jc = 5;
+          Jmin = 10;
+          Jmax = 42;
+          S1 = 60;
+          S2 = 90;
+          H4 = 12345;
+        };
+        description = ''
+          Extra options to append to the interface section. Can be used to define AmneziaWG-specific options.
+        '';
+      };
     };
   };
 
@@ -227,7 +252,7 @@ let
 
   writeScriptFile = name: text: ((pkgs.writeShellScriptBin name text) + "/bin/${name}");
 
-  generatePrivateKeyScript = privateKeyFile: ''
+  generatePrivateKeyScript = privateKeyFile: wgBin: ''
     set -e
 
     # If the parent dir does not already exist, create it.
@@ -236,7 +261,7 @@ let
 
     if [ ! -f "${privateKeyFile}" ]; then
       # Write private key file with atomically-correct permissions.
-      (set -e; umask 077; wg genkey > "${privateKeyFile}")
+      (set -e; umask 077; ${wgBin} genkey > "${privateKeyFile}")
     fi
   '';
 
@@ -244,11 +269,19 @@ let
     assert assertMsg (values.configFile != null || ((values.privateKey != null) != (values.privateKeyFile != null))) "Only one of privateKey, configFile or privateKeyFile may be set";
     assert assertMsg (values.generatePrivateKeyFile == false || values.privateKeyFile != null) "generatePrivateKeyFile requires privateKeyFile to be set";
     let
-      generateKeyScriptFile = if values.generatePrivateKeyFile then writeScriptFile "generatePrivateKey.sh" (generatePrivateKeyScript values.privateKeyFile) else null;
+      wgBin = {
+        wireguard = "wg";
+        amneziawg = "awg";
+      }.${values.type};
+      generateKeyScriptFile =
+        if values.generatePrivateKeyFile then
+          writeScriptFile "generatePrivateKey.sh" (generatePrivateKeyScript values.privateKeyFile wgBin)
+        else
+          null;
       preUpFile = if values.preUp != "" then writeScriptFile "preUp.sh" values.preUp else null;
       postUp =
-            optional (values.privateKeyFile != null) "wg set ${name} private-key <(cat ${values.privateKeyFile})" ++
+            optional (values.privateKeyFile != null) "${wgBin} set ${name} private-key <(cat ${values.privateKeyFile})" ++
-            (concatMap (peer: optional (peer.presharedKeyFile != null) "wg set ${name} peer ${peer.publicKey} preshared-key <(cat ${peer.presharedKeyFile})") values.peers) ++
+            (concatMap (peer: optional (peer.presharedKeyFile != null) "${wgBin} set ${name} peer ${peer.publicKey} preshared-key <(cat ${peer.presharedKeyFile})") values.peers) ++
             optional (values.postUp != "") values.postUp;
       postUpFile = if postUp != [] then writeScriptFile "postUp.sh" (concatMapStringsSep "\n" (line: line) postUp) else null;
       preDownFile = if values.preDown != "" then writeScriptFile "preDown.sh" values.preDown else null;
@@ -276,6 +309,7 @@ let
         optionalString (postUpFile != null) "PostUp = ${postUpFile}\n" +
         optionalString (preDownFile != null) "PreDown = ${preDownFile}\n" +
         optionalString (postDownFile != null) "PostDown = ${postDownFile}\n" +
+        concatLines (mapAttrsToList (n: v: "${n} = ${toString v}") values.extraOptions) +
         concatMapStringsSep "\n" (peer:
           assert assertMsg (!((peer.presharedKeyFile != null) && (peer.presharedKey != null))) "Only one of presharedKey or presharedKeyFile may be set";
           "[Peer]\n" +
@@ -301,7 +335,10 @@ let
         wantedBy = optional values.autostart "multi-user.target";
         environment.DEVICE = name;
         path = [
-          pkgs.wireguard-tools
+          {
+            wireguard = pkgs.wireguard-tools;
+            amneziawg = pkgs.amneziawg-tools;
+          }.${values.type}
           config.networking.firewall.package   # iptables or nftables
           config.networking.resolvconf.package # openresolv or systemd
         ];
@@ -312,11 +349,11 @@ let
         };
 
         script = ''
-          ${optionalString (!config.boot.isContainer) "${pkgs.kmod}/bin/modprobe wireguard"}
+          ${optionalString (!config.boot.isContainer) "${pkgs.kmod}/bin/modprobe ${values.type}"}
           ${optionalString (values.configFile != null) ''
             cp ${values.configFile} ${configPath}
           ''}
-          wg-quick up ${configPath}
+          ${wgBin}-quick up ${configPath}
         '';
 
         serviceConfig = {
@@ -325,7 +362,7 @@ let
         };
 
         preStop = ''
-          wg-quick down ${configPath}
+          ${wgBin}-quick down ${configPath}
         '';
       };
 in {
@@ -357,8 +394,12 @@ in {
   ###### implementation
 
   config = mkIf (cfg.interfaces != {}) {
-    boot.extraModulePackages = optional (versionOlder kernel.kernel.version "5.6") kernel.wireguard;
+    boot.extraModulePackages =
-    environment.systemPackages = [ pkgs.wireguard-tools ];
+      optional (any (x: x.type == "wireguard") (attrValues cfg.interfaces) && (versionOlder kernel.kernel.version "5.6")) kernel.wireguard
+      ++ optional (any (x: x.type == "amneziawg") (attrValues cfg.interfaces)) kernel.amneziawg;
+    environment.systemPackages =
+      optional (any (x: x.type == "wireguard") (attrValues cfg.interfaces)) pkgs.wireguard-tools
+      ++ optional (any (x: x.type == "amneziawg") (attrValues cfg.interfaces)) pkgs.amneziawg-tools;
     systemd.services = mapAttrs' generateUnit cfg.interfaces;
 
     # Prevent networkd from clearing the rules set by wg-quick when restarted (e.g. when waking up from suspend).

nixos/tests/wireguard/amneziawg-quick.nix

@@ -0,0 +1,125 @@
+import ../make-test-python.nix (
+  {
+    pkgs,
+    lib,
+    kernelPackages ? null,
+    nftables ? false,
+    ...
+  }:
+  let
+    wg-snakeoil-keys = import ./snakeoil-keys.nix;
+    peer = import ./make-peer.nix { inherit lib; };
+    commonConfig = {
+      boot.kernelPackages = lib.mkIf (kernelPackages != null) kernelPackages;
+      networking.nftables.enable = nftables;
+      # Make sure iptables doesn't work with nftables enabled
+      boot.blacklistedKernelModules = lib.mkIf nftables [ "nft_compat" ];
+    };
+    extraOptions = {
+      Jc = 5;
+      Jmin = 10;
+      Jmax = 42;
+      S1 = 60;
+      S2 = 90;
+    };
+  in
+  {
+    name = "amneziawg-quick";
+    meta = with pkgs.lib.maintainers; {
+      maintainers = [
+        averyanalex
+        azahi
+      ];
+    };
+
+    nodes = {
+      peer0 = peer {
+        ip4 = "192.168.0.1";
+        ip6 = "fd00::1";
+        extraConfig = lib.mkMerge [
+          commonConfig
+          {
+            networking.firewall.allowedUDPPorts = [ 23542 ];
+            networking.wg-quick.interfaces.wg0 = {
+              type = "amneziawg";
+
+              address = [
+                "10.23.42.1/32"
+                "fc00::1/128"
+              ];
+              listenPort = 23542;
+
+              inherit (wg-snakeoil-keys.peer0) privateKey;
+
+              peers = lib.singleton {
+                allowedIPs = [
+                  "10.23.42.2/32"
+                  "fc00::2/128"
+                ];
+
+                inherit (wg-snakeoil-keys.peer1) publicKey;
+              };
+
+              dns = [
+                "10.23.42.2"
+                "fc00::2"
+                "wg0"
+              ];
+
+              inherit extraOptions;
+            };
+          }
+        ];
+      };
+
+      peer1 = peer {
+        ip4 = "192.168.0.2";
+        ip6 = "fd00::2";
+        extraConfig = lib.mkMerge [
+          commonConfig
+          {
+            networking.useNetworkd = true;
+            networking.wg-quick.interfaces.wg0 = {
+              type = "amneziawg";
+
+              address = [
+                "10.23.42.2/32"
+                "fc00::2/128"
+              ];
+              inherit (wg-snakeoil-keys.peer1) privateKey;
+
+              peers = lib.singleton {
+                allowedIPs = [
+                  "0.0.0.0/0"
+                  "::/0"
+                ];
+                endpoint = "192.168.0.1:23542";
+                persistentKeepalive = 25;
+
+                inherit (wg-snakeoil-keys.peer0) publicKey;
+              };
+
+              dns = [
+                "10.23.42.1"
+                "fc00::1"
+                "wg0"
+              ];
+
+              inherit extraOptions;
+            };
+          }
+        ];
+      };
+    };
+
+    testScript = ''
+      start_all()
+
+      peer0.wait_for_unit("wg-quick-wg0.service")
+      peer1.wait_for_unit("wg-quick-wg0.service")
+
+      peer1.succeed("ping -c5 fc00::1")
+      peer1.succeed("ping -c5 10.23.42.1")
+    '';
+  }
+)

nixos/tests/wireguard/default.nix

@@ -14,6 +14,7 @@ let
     networkd = callTest ./networkd.nix;
     wg-quick = callTest ./wg-quick.nix;
     wg-quick-nftables = args: callTest ./wg-quick.nix ({ nftables = true; } // args);
+    amneziawg-quick = callTest ./amneziawg-quick.nix;
     generated = callTest ./generated.nix;
     dynamic-refresh = callTest ./dynamic-refresh.nix;
     dynamic-refresh-networkd = args: callTest ./dynamic-refresh.nix ({ useNetworkd = true; } // args);