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105 lines
3.5 KiB
Nix
105 lines
3.5 KiB
Nix
import ./make-test-python.nix ({ pkgs, ... } : {
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name = "hardened";
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meta = with pkgs.lib.maintainers; {
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maintainers = [ joachifm ];
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};
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nodes.machine =
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{ lib, pkgs, config, ... }:
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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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environment.memoryAllocator.provider = "graphene-hardened";
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nix.settings.sandbox = false;
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nixpkgs.overlays = [
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(final: super: {
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dhcpcd = super.dhcpcd.override { enablePrivSep = false; };
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})
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];
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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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virtualisation.fileSystems = {
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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 =
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pkgs.lib.optional (pkgs.lib.versionOlder config.boot.kernelPackages.kernel.version "5.6")
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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.graphene-hardened-malloc.ld-preload-tests;
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in
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''
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machine.wait_for_unit("multi-user.target")
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with subtest("AppArmor profiles are loaded"):
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machine.succeed("systemctl status apparmor.service")
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# AppArmor securityfs
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with subtest("AppArmor securityfs is mounted"):
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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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# Test loading out-of-tree modules
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with subtest("Out-of-tree modules can be loaded"):
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machine.succeed("grep -Fq wireguard /proc/modules")
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# Test kernel module hardening
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with subtest("No more kernel modules can be loaded"):
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# note: this better a be module we normally wouldn't load ...
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machine.wait_for_unit("disable-kernel-module-loading.service")
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machine.fail("modprobe dccp")
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# Test userns
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with subtest("User namespaces are restricted"):
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machine.succeed("unshare --user true")
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machine.fail("su -l alice -c 'unshare --user true'")
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# Test dmesg restriction
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with subtest("Regular users cannot access dmesg"):
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machine.fail("su -l alice -c dmesg")
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# Test access to kcore
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with subtest("Kcore is inaccessible as root"):
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machine.fail("cat /proc/kcore")
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# Test deferred mount
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with subtest("Deferred mounts work"):
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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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# Test Nix dæmon usage
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with subtest("nix-daemon cannot be used by all users"):
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machine.fail("su -l nobody -s /bin/sh -c 'nix --extra-experimental-features nix-command ping-store'")
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machine.succeed("su -l alice -c 'nix --extra-experimental-features nix-command ping-store'")
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# Test kernel image protection
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with subtest("The kernel image is protected"):
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machine.fail("systemctl hibernate")
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machine.fail("systemctl kexec")
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with subtest("The hardened memory allocator works"):
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machine.succeed("${hardened-malloc-tests}/bin/run-tests")
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'';
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})
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