improve getty coverage

hardening/opensnitch/default.nix

@@ -46,7 +46,9 @@ in
     networking.nftables.enable = true;
 
     # security.audit.enable = true;
-    systemd.services.opensnitchd.path = lib.optional (config.services.opensnitch.settings.ProcMonitorMethod == "audit") pkgs.audit.bin;
+    systemd.services.opensnitchd.path = lib.optional (
+      config.services.opensnitch.settings.ProcMonitorMethod == "audit"
+    ) pkgs.audit.bin;
 
     services.opensnitch = {
       enable = true;

hardening/systemd/global/default.nix

@@ -2,5 +2,6 @@
   imports = [
     ./hostname.nix
     ./clock.nix
+    ./realtime.nix
   ];
 }

hardening/systemd/global/realtime.nix

@@ -0,0 +1,27 @@
+{ lib, config, ... }:
+let
+  inherit (lib) mkDefault types mkIf;
+in
+{
+  options.systemd.services = lib.mkOption {
+    type =
+      let
+        osConfig = config;
+      in
+      types.attrsOf (
+        lib.types.submodule {
+          config.serviceConfig = mkIf (osConfig.specialisation != { }) {
+            RestrictRealtime = mkDefault true;
+          };
+        }
+
+      );
+  };
+
+  config = mkIf (config.specialisation != { }) {
+
+    systemd.services = {
+      rtkit-daemon.serviceConfig.RestrictRealtime = false;
+    };
+  };
+}

hardening/systemd/tty.nix

@@ -3,16 +3,32 @@
   config.systemd.services = lib.mkIf (config.specialisation != { }) {
     "getty@".serviceConfig = {
 
-      #CapabilityBoundingSet =[
+      CapabilityBoundingSet = [
-      #  "CAP_SYS_TTY_CONFIGCAP_LEASE"
+        "CAP_CHOWN"
-      #];
+        "CAP_FOWNER"
+        "CAP_FSETID"
+        "CAP_SETGID"
+        "CAP_SETUID"
+        "CAP_SYS_NICE"
+        "CAP_SYS_RESOURCE"
+        "CAP_SYS_TTY_CONFIG"
+      ];
 
       # NoNewPrivileges = true;
-      RestrictNamespaces = "pid";
+
+      RestrictNamespaces = [
+        "~pid"
+        "~user"
+        "~net"
+        "~uts"
+        "~mnt"
+        "~cgroup"
+        "~ipc"
+      ];
 
       ProtectControlGroups = true;
       ProtectHome = false;
-      ProtectClock = false;
+      #      ProtectClock = true;
       ProtectKernelModules = true;
       ProtectKernelTunables = true;
       MemoryDenyWriteExecute = true;
@@ -20,7 +36,6 @@
       SystemCallArchitectures = "native";
       SystemCallFilter = lib.mkForce "@system-service";
       LockPersonality = true;
-      #RestrictRealtime=true;
       ProtectProc = "invisible";
 
       # PrivateUsers=true;

specific/grimm-nixos-ssd/configuration.nix

@@ -30,7 +30,7 @@
   grimmShared = {
     tooling = {
       enable = true;
-#      pass = true;
+      #      pass = true;
     };
     gaming = true;
     portals = true;