common: harden logrotate

hosts/common/default.nix

@@ -12,7 +12,9 @@ in {
     ./programs/ssh.nix
     ./programs/usbtop.nix
 
+    ./services/cups.nix
     ./services/dbus.nix
+    ./services/logrotate.nix
     ./services/openssh.nix
     ./services/pcscd.nix
     ./services/pipewire.nix

hosts/common/services/cups.nix

@@ -0,0 +1,71 @@
+{ config, lib, ... }:
+{
+  systemd.services = lib.mkIf config.services.printing.enable {
+    cups.serviceConfig = {
+      PrivateTmp = true;
+      ProtectSystem = "strict";
+      ProtectHome = true;
+      ProtectClock= true;
+      ProtectControlGroups = true;
+      ProtectHostname = true; 
+      ProtectKernelLogs = true;
+      ProtectKernelModules = true;
+      ProtectKernelTunables = true;
+      ProtectProc = "invisible";
+      PrivateDevices = true;
+      NoNewPrivileges = true;
+      # User =
+      AmbientCapabilities = [ "" ];
+      CapabilityBoundingSet = [ "" ];
+      DevicePolicy = "closed";
+      KeyringMode = "private";
+      LockPersonality = true;
+      MemoryDenyWriteExecute = true;
+      PrivateUsers = true;
+      RemoveIPC = true;
+      # RestrictAddressFamilies = [ "" ];
+      RestrictNamespaces=true;
+      RestrictRealtime=true;
+      RestrictSUIDSGID=true;
+      SystemCallArchitectures = "native";
+      SystemCallFilter = [
+        "@system-service"
+        "~@privileged"
+      ];
+      UMask = "0077";
+    };
+    cups-browsed.serviceConfig = {
+      PrivateTmp = true;
+      ProtectSystem = "strict";
+      ProtectHome = true;
+      ProtectClock= true;
+      ProtectControlGroups = true;
+      ProtectHostname = true;
+      ProtectKernelLogs = true;
+      ProtectKernelModules = true;
+      ProtectKernelTunables = true;
+      ProtectProc = "invisible";
+      PrivateDevices = true;
+      NoNewPrivileges = true;
+      # User =
+      AmbientCapabilities = [ "" ];
+      CapabilityBoundingSet = [ "" ];
+      DevicePolicy = "closed";
+      KeyringMode = "private";
+      LockPersonality = true;
+      MemoryDenyWriteExecute = true;
+      PrivateUsers = true;
+      RemoveIPC = true;
+      # RestrictAddressFamilies = [ "" ];
+      RestrictNamespaces=true;
+      RestrictRealtime=true;
+      RestrictSUIDSGID=true;
+      SystemCallArchitectures = "native";
+      SystemCallFilter = [
+        "@system-service"
+        "~@privileged"
+      ];
+      UMask = "0077";
+    };
+  };
+}

hosts/common/services/logrotate.nix

@@ -0,0 +1,42 @@
+{ ... }:
+{
+  # source: https://github.com/logrotate/logrotate/blob/main/examples/logrotate.service
+  systemd.services.logrotate = {
+    documentation = [ "man:logrotate(8)" "man:logrotate.conf(5)" ];
+    unitConfig.RequiresMountsFor = "/var/log";
+    serviceConfig = {
+      Nice = 19;
+      IOSchedulingClass = "best-effort";
+      IOSchedulingPriority = 7;
+
+      ReadWritePaths = [ "/var/log" ];
+
+      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"
+      ];
+    };
+  };
+}