125 lines
4.0 KiB
Nix
125 lines
4.0 KiB
Nix
import ./make-test.nix ({ pkgs, ...} : {
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name = "hardened";
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meta = with pkgs.stdenv.lib.maintainers; {
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maintainers = [ joachifm ];
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};
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machine =
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{ lib, pkgs, config, ... }:
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with lib;
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{ users.users.alice = { isNormalUser = true; extraGroups = [ "proc" ]; };
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users.users.sybil = { isNormalUser = true; group = "wheel"; };
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imports = [ ../modules/profiles/hardened.nix ];
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nix.useSandbox = false;
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virtualisation.emptyDiskImages = [ 4096 ];
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boot.initrd.postDeviceCommands = ''
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${pkgs.dosfstools}/bin/mkfs.vfat -n EFISYS /dev/vdb
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'';
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fileSystems = lib.mkVMOverride {
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"/efi" = {
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device = "/dev/disk/by-label/EFISYS";
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fsType = "vfat";
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options = [ "noauto" ];
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};
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};
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boot.extraModulePackages = [ config.boot.kernelPackages.wireguard ];
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boot.kernelModules = [ "wireguard" ];
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};
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testScript =
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let
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hardened-malloc-tests = pkgs.stdenv.mkDerivation rec {
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name = "hardened-malloc-tests-${pkgs.graphene-hardened-malloc.version}";
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src = pkgs.graphene-hardened-malloc.src;
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buildPhase = ''
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cd test/simple-memory-corruption
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make -j4
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'';
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installPhase = ''
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find . -type f -executable -exec install -Dt $out/bin '{}' +
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'';
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};
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in
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''
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$machine->waitForUnit("multi-user.target");
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subtest "apparmor-loaded", sub {
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$machine->succeed("systemctl status apparmor.service");
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};
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# AppArmor securityfs
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subtest "apparmor-securityfs", sub {
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$machine->succeed("mountpoint -q /sys/kernel/security");
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$machine->succeed("cat /sys/kernel/security/apparmor/profiles");
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};
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# Test loading out-of-tree modules
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subtest "extra-module-packages", sub {
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$machine->succeed("grep -Fq wireguard /proc/modules");
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};
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# Test hidepid
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subtest "hidepid", sub {
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$machine->succeed("grep -Fq hidepid=2 /proc/mounts");
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# cannot use pgrep -u here, it segfaults when access to process info is denied
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$machine->succeed("[ `su - sybil -c 'ps --no-headers --user root | wc -l'` = 0 ]");
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$machine->succeed("[ `su - alice -c 'ps --no-headers --user root | wc -l'` != 0 ]");
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};
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# Test kernel module hardening
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subtest "lock-modules", sub {
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# note: this better a be module we normally wouldn't load ...
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$machine->fail("modprobe dccp");
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};
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# Test userns
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subtest "userns", sub {
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$machine->fail("unshare --user");
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};
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# Test dmesg restriction
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subtest "dmesg", sub {
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$machine->fail("su -l alice -c dmesg");
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};
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# Test access to kcore
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subtest "kcore", sub {
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$machine->fail("cat /proc/kcore");
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};
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# Test deferred mount
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subtest "mount", sub {
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$machine->fail("mountpoint -q /efi"); # was deferred
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$machine->execute("mkdir -p /efi");
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$machine->succeed("mount /dev/disk/by-label/EFISYS /efi");
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$machine->succeed("mountpoint -q /efi"); # now mounted
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};
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# Test Nix dæmon usage
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subtest "nix-daemon", sub {
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$machine->fail("su -l nobody -s /bin/sh -c 'nix ping-store'");
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$machine->succeed("su -l alice -c 'nix ping-store'") =~ "OK";
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};
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# Test kernel image protection
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subtest "kernelimage", sub {
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$machine->fail("systemctl hibernate");
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$machine->fail("systemctl kexec");
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};
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# Test hardened memory allocator
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sub runMallocTestProg {
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my ($progName, $errorText) = @_;
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my $text = "fatal allocator error: " . $errorText;
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$machine->fail("${hardened-malloc-tests}/bin/" . $progName) =~ $text;
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};
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subtest "hardenedmalloc", sub {
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runMallocTestProg("double_free_large", "invalid free");
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runMallocTestProg("unaligned_free_small", "invalid unaligned free");
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runMallocTestProg("write_after_free_small", "detected write after free");
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};
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'';
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})
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