From 4400ee83ecf2408489fba37fa5aa6d42804ee4b7 Mon Sep 17 00:00:00 2001
From: Robert Schütz <dev@schuetz-co.de>
Date: Sat, 8 May 2021 18:04:01 +0200
Subject: nixos/znc: harden systemd unit

---
 nixos/modules/services/networking/znc/default.nix | 28 +++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'nixos/modules/services/networking/znc/default.nix')

diff --git a/nixos/modules/services/networking/znc/default.nix b/nixos/modules/services/networking/znc/default.nix
index a7315896c50..83b9b85e0c6 100644
--- a/nixos/modules/services/networking/znc/default.nix
+++ b/nixos/modules/services/networking/znc/default.nix
@@ -258,6 +258,34 @@ in
         ExecStart = "${pkgs.znc}/bin/znc --foreground --datadir ${cfg.dataDir} ${escapeShellArgs cfg.extraFlags}";
         ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
         ExecStop = "${pkgs.coreutils}/bin/kill -INT $MAINPID";
+        # Hardening
+        CapabilityBoundingSet = [ "" ];
+        DevicePolicy = "closed";
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        PrivateTmp = true;
+        PrivateUsers = true;
+        ProcSubset = "pid";
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHome = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        ProtectProc = "invisible";
+        ProtectSystem = "strict";
+        ReadWritePaths = [ cfg.dataDir ];
+        RemoveIPC = true;
+        RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        RestrictSUIDSGID = true;
+        SystemCallArchitectures = "native";
+        SystemCallFilter = [ "@system-service" "~@privileged" "~@resources" ];
+        UMask = "0027";
       };
       preStart = ''
         mkdir -p ${cfg.dataDir}/configs
-- 
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