137 lines
4.6 KiB
Nix
137 lines
4.6 KiB
Nix
import ./make-test-python.nix ({ pkgs, latestKernel ? false, ... } : {
|
|
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 ];
|
|
boot.kernelPackages =
|
|
lib.mkIf latestKernel pkgs.linuxPackages_latest_hardened;
|
|
environment.memoryAllocator.provider = "graphene-hardened";
|
|
nix.useSandbox = false;
|
|
virtualisation.emptyDiskImages = [ 4096 ];
|
|
boot.initrd.postDeviceCommands = ''
|
|
${pkgs.dosfstools}/bin/mkfs.vfat -n EFISYS /dev/vdb
|
|
'';
|
|
fileSystems = lib.mkVMOverride {
|
|
"/efi" = {
|
|
device = "/dev/disk/by-label/EFISYS";
|
|
fsType = "vfat";
|
|
options = [ "noauto" ];
|
|
};
|
|
};
|
|
boot.extraModulePackages =
|
|
optional (versionOlder config.boot.kernelPackages.kernel.version "5.6")
|
|
config.boot.kernelPackages.wireguard;
|
|
boot.kernelModules = [ "wireguard" ];
|
|
};
|
|
|
|
testScript =
|
|
let
|
|
hardened-malloc-tests = pkgs.stdenv.mkDerivation {
|
|
name = "hardened-malloc-tests-${pkgs.graphene-hardened-malloc.version}";
|
|
src = pkgs.graphene-hardened-malloc.src;
|
|
buildPhase = ''
|
|
cd test/simple-memory-corruption
|
|
make -j4
|
|
'';
|
|
|
|
installPhase = ''
|
|
find . -type f -executable -exec install -Dt $out/bin '{}' +
|
|
'';
|
|
};
|
|
in
|
|
''
|
|
machine.wait_for_unit("multi-user.target")
|
|
|
|
|
|
with subtest("AppArmor profiles are loaded"):
|
|
machine.succeed("systemctl status apparmor.service")
|
|
|
|
|
|
# AppArmor securityfs
|
|
with subtest("AppArmor securityfs is mounted"):
|
|
machine.succeed("mountpoint -q /sys/kernel/security")
|
|
machine.succeed("cat /sys/kernel/security/apparmor/profiles")
|
|
|
|
|
|
# Test loading out-of-tree modules
|
|
with subtest("Out-of-tree modules can be loaded"):
|
|
machine.succeed("grep -Fq wireguard /proc/modules")
|
|
|
|
|
|
# Test hidepid
|
|
with subtest("hidepid=2 option is applied and works"):
|
|
# Linux >= 5.8 shows "invisible"
|
|
machine.succeed(
|
|
"grep -Fq hidepid=2 /proc/mounts || grep -Fq hidepid=invisible /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
|
|
with subtest("No more kernel modules can be loaded"):
|
|
# note: this better a be module we normally wouldn't load ...
|
|
machine.fail("modprobe dccp")
|
|
|
|
|
|
# Test userns
|
|
with subtest("User namespaces are restricted"):
|
|
machine.succeed("unshare --user true")
|
|
machine.fail("su -l alice -c 'unshare --user true'")
|
|
|
|
|
|
# Test dmesg restriction
|
|
with subtest("Regular users cannot access dmesg"):
|
|
machine.fail("su -l alice -c dmesg")
|
|
|
|
|
|
# Test access to kcore
|
|
with subtest("Kcore is inaccessible as root"):
|
|
machine.fail("cat /proc/kcore")
|
|
|
|
|
|
# Test deferred mount
|
|
with subtest("Deferred mounts work"):
|
|
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
|
|
with subtest("nix-daemon cannot be used by all users"):
|
|
machine.fail("su -l nobody -s /bin/sh -c 'nix ping-store'")
|
|
machine.succeed("su -l alice -c 'nix ping-store'")
|
|
|
|
|
|
# Test kernel image protection
|
|
with subtest("The kernel image is protected"):
|
|
machine.fail("systemctl hibernate")
|
|
machine.fail("systemctl kexec")
|
|
|
|
|
|
# Test hardened memory allocator
|
|
def runMallocTestProg(prog_name, error_text):
|
|
text = "fatal allocator error: " + error_text
|
|
if not text in machine.fail(
|
|
"${hardened-malloc-tests}/bin/"
|
|
+ prog_name
|
|
+ " 2>&1"
|
|
):
|
|
raise Exception("Hardened malloc does not work for {}".format(error_text))
|
|
|
|
|
|
with subtest("The hardened memory allocator works"):
|
|
runMallocTestProg("double_free_large", "invalid free")
|
|
runMallocTestProg("unaligned_free_small", "invalid unaligned free")
|
|
runMallocTestProg("write_after_free_small", "detected write after free")
|
|
'';
|
|
})
|