systemd hardening for pvv-nettsiden-gallery-update.service (!90)

#133

Reviewed-on: https://git.pvv.ntnu.no/Drift/pvv-nixos-config/pulls/90
Reviewed-by: Oystein Kristoffer Tveit <oysteikt@pvv.ntnu.no>
Co-authored-by: Alf Helge Jakobsen <alfhj@stud.ntnu.no>
Co-committed-by: Alf Helge Jakobsen <alfhj@stud.ntnu.no>

flake.lock

@@ -28,11 +28,11 @@
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1729619392,
-        "narHash": "sha256-olNCSjGLN6W2aIjdMeFrV5gIDrAx8PbUhhiF7LcL+ms=",
+        "lastModified": 1730249639,
+        "narHash": "sha256-G3URSlqCcb+GIvGyki+HHrDM5ZanX/dP9BtppD/SdfI=",
         "ref": "refs/heads/main",
-        "rev": "355d2ad13d355225fbedf8bb08dc49e9b5f4b9f2",
-        "revCount": 31,
+        "rev": "80e0447bcb79adad4f459ada5610f3eae987b4e3",
+        "revCount": 34,
         "type": "git",
         "url": "https://git.pvv.ntnu.no/Projects/greg-ng.git"
       },

hosts/bekkalokk/services/website/fetch-gallery.nix

@@ -62,6 +62,33 @@ in {
       WorkingDirectory = galleryDir;
       User = config.services.pvv-nettsiden.user;
       Group = config.services.pvv-nettsiden.group;
+
+      AmbientCapabilities = [ "" ];
+      CapabilityBoundingSet = [ "" ];
+      DeviceAllow = [ "" ];
+      LockPersonality = true;
+      MemoryDenyWriteExecute = true;
+      NoNewPrivileges = true; # disable for third party rotate scripts
+      PrivateDevices = true;
+      PrivateNetwork = true; # disable for mail delivery
+      PrivateTmp = true;
+      ProtectClock = true;
+      ProtectControlGroups = true;
+      ProtectHome = true; # disable for userdir logs
+      ProtectHostname = true;
+      ProtectKernelLogs = true;
+      ProtectKernelModules = true;
+      ProtectKernelTunables = true;
+      ProtectProc = "invisible";
+      ProtectSystem = "full";
+      RestrictNamespaces = true;
+      RestrictRealtime = true;
+      RestrictSUIDSGID = true; # disable for creating setgid directories
+      SocketBindDeny = [ "any" ];
+      SystemCallArchitectures = "native";
+      SystemCallFilter = [
+        "@system-service"
+      ];
     };
   };
 }

users/alfhj.nix

@@ -0,0 +1,13 @@
+{pkgs, ...}:
+
+{
+  users.users.alfhj = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" ];
+    shell = pkgs.zsh;
+    openssh.authorizedKeys.keys = [
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMCAYE0U3sFizm/NSbKCs0jEhZ1mpAWPcijFevejiFL1 alfhj"
+    ];
+  };
+}
+