nixos/sshwifty: init module

Signed-off-by: David Wronek <david.wronek@mainlining.org>

nixos/modules/module-list.nix

@@ -1694,6 +1694,7 @@
   ./services/web-apps/snipe-it.nix
   ./services/web-apps/snips-sh.nix
   ./services/web-apps/sogo.nix
+  ./services/web-apps/sshwifty.nix
   ./services/web-apps/stash.nix
   ./services/web-apps/stirling-pdf.nix
   ./services/web-apps/strfry.nix

nixos/modules/services/web-apps/sshwifty.nix

@@ -0,0 +1,128 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.services.sshwifty;
+  format = pkgs.formats.json { };
+  settings = format.generate "sshwifty.json" cfg.settings;
+in
+{
+  options.services.sshwifty = {
+    enable = lib.mkEnableOption "Sshwifty";
+    package = lib.mkPackageOption pkgs "sshwifty" { };
+    settings = lib.mkOption {
+      type = format.type;
+      description = ''
+        Configuration for Sshwifty. See
+        [the Sshwifty documentation](https://github.com/nirui/sshwifty/tree/master?tab=readme-ov-file#configuration)
+        for possible options.
+      '';
+    };
+    sharedKeyFile = lib.mkOption {
+      type = lib.types.nullOr lib.types.path;
+      default = null;
+      description = "Path to a file containing the shared key.";
+    };
+    socks5PasswordFile = lib.mkOption {
+      type = lib.types.nullOr lib.types.path;
+      default = null;
+      description = "Path to a file containing the SOCKS5 password.";
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    systemd.services.sshwifty = {
+      description = "Sshwifty";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      script = ''
+        ${lib.optionalString (cfg.sharedKeyFile != null || cfg.socks5PasswordFile != null) (
+          lib.concatStringsSep " " [
+            (lib.getExe pkgs.jq)
+            "-s"
+            "'.[0] * .[1]"
+            (lib.optionalString (cfg.sharedKeyFile != null && cfg.socks5PasswordFile != null) "* .[2]")
+            "'"
+            settings
+            (lib.optionalString (
+              cfg.sharedKeyFile != null
+            ) "<(echo \"{\\\"SharedKey\\\":\\\"$(cat $CREDENTIALS_DIRECTORY/sharedkey)\\\"}\")")
+            (lib.optionalString (
+              cfg.socks5PasswordFile != null
+            ) "<(echo \"{\\\"Socks5Password\\\":\\\"$(cat $CREDENTIALS_DIRECTORY/socks5pass)\\\"}\")")
+            "> /run/sshwifty/sshwifty.json"
+          ]
+        )}
+        ${lib.optionalString (
+          cfg.sharedKeyFile != null || cfg.socks5PasswordFile != null
+        ) "export SSHWIFTY_CONFIG=/run/sshwifty/sshwifty.json"}
+        ${lib.optionalString (
+          cfg.sharedKeyFile == null && cfg.socks5PasswordFile == null
+        ) "export SSHWIFTY_CONFIG=${settings}"}
+        exec ${lib.getExe cfg.package}
+      '';
+      serviceConfig = {
+        DynamicUser = true;
+        RuntimeDirectory = "sshwifty";
+        RuntimeDirectoryMode = "0750";
+        LoadCredential =
+          [ ]
+          ++ lib.optionals (cfg.sharedKeyFile != null) [ "sharedkey:${cfg.sharedKeyFile}" ]
+          ++ lib.optionals (cfg.socks5PasswordFile != null) [ "socks5pass:${cfg.socks5PasswordFile}" ];
+        # Hardening
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        PrivateMounts = true;
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHome = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        RemoveIPC = true;
+        RestrictRealtime = true;
+        RestrictSUIDSGID = true;
+        CapabilityBoundingSet = "CAP_NET_BIND_SERVICE";
+        AmbientCapabilities = "CAP_NET_BIND_SERVICE";
+        PrivateTmp = "disconnected";
+        ProcSubset = "pid";
+        ProtectProc = "invisible";
+        ProtectSystem = "strict";
+        RestrictAddressFamilies = [
+          "AF_INET"
+          "AF_INET6"
+        ];
+        RestrictNamespaces = [
+          "~cgroup"
+          "~ipc"
+          "~mnt"
+          "~net"
+          "~pid"
+          "~user"
+          "~uts"
+        ];
+        SystemCallArchitectures = "native";
+        SystemCallFilter = [
+          "~@clock"
+          "~@cpu-emulation"
+          "~@debug"
+          "~@module"
+          "~@mount"
+          "~@obsolete"
+          "~@privileged"
+          "~@raw-io"
+          "~@reboot"
+          "~@resources"
+          "~@swap"
+        ];
+        UMask = "0077";
+      };
+    };
+  };
+  meta.maintainers = [ lib.maintainers.ungeskriptet ];
+}