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|
import ./make-test.nix ({ pkgs, ...} : {
name = "hardened";
meta = with pkgs.stdenv.lib.maintainers; {
maintainers = [ joachifm ];
};
machine =
{ lib, pkgs, ... }:
with lib;
{ users.users.alice = { isNormalUser = true; extraGroups = [ "proc" ]; };
users.users.sybil = { isNormalUser = true; group = "wheel"; };
imports = [ ../modules/profiles/hardened.nix ];
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" ];
};
};
};
testScript =
''
$machine->waitForUnit("multi-user.target");
# 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
};
'';
})
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