import ./make-test.nix ({ pkgs, ...} : { name = "hardened"; meta = with pkgs.stdenv.lib.maintainers; { maintainers = [ joachifm ]; }; machine = { lib, pkgs, config, ... }: with lib; { users.users.alice = { isNormalUser = true; extraGroups = [ "proc" ]; }; users.users.sybil = { isNormalUser = true; group = "wheel"; }; imports = [ ../modules/profiles/hardened.nix ]; nix.useSandbox = false; virtualisation.emptyDiskImages = [ 4096 ]; boot.initrd.postDeviceCommands = '' ${pkgs.dosfstools}/bin/mkfs.vfat -n EFISYS /dev/vdb ''; fileSystems = lib.mkVMOverride { "/efi" = { device = "/dev/disk/by-label/EFISYS"; fsType = "vfat"; options = [ "noauto" ]; }; }; boot.extraModulePackages = [ config.boot.kernelPackages.wireguard ]; boot.kernelModules = [ "wireguard" ]; }; testScript = '' $machine->waitForUnit("multi-user.target"); # Test loading out-of-tree modules subtest "extra-module-packages", sub { $machine->succeed("grep -Fq wireguard /proc/modules"); }; # Test hidepid subtest "hidepid", sub { $machine->succeed("grep -Fq hidepid=2 /proc/mounts"); # cannot use pgrep -u here, it segfaults when access to process info is denied $machine->succeed("[ `su - sybil -c 'ps --no-headers --user root | wc -l'` = 0 ]"); $machine->succeed("[ `su - alice -c 'ps --no-headers --user root | wc -l'` != 0 ]"); }; # Test kernel module hardening subtest "lock-modules", sub { # note: this better a be module we normally wouldn't load ... $machine->fail("modprobe dccp"); }; # Test userns subtest "userns", sub { $machine->fail("unshare --user"); }; # Test dmesg restriction subtest "dmesg", sub { $machine->fail("su -l alice -c dmesg"); }; # Test access to kcore subtest "kcore", sub { $machine->fail("cat /proc/kcore"); }; # Test deferred mount subtest "mount", sub { $machine->fail("mountpoint -q /efi"); # was deferred $machine->execute("mkdir -p /efi"); $machine->succeed("mount /dev/disk/by-label/EFISYS /efi"); $machine->succeed("mountpoint -q /efi"); # now mounted }; # Test Nix dæmon usage subtest "nix-daemon", sub { $machine->fail("su -l nobody -s /bin/sh -c 'nix ping-store'"); $machine->succeed("su -l alice -c 'nix ping-store'") =~ "OK"; }; # Test kernel image protection subtest "kernelimage", sub { $machine->fail("systemctl hibernate"); $machine->fail("systemctl kexec"); }; ''; })