# Verify that Linux builds cannot create setuid or setgid binaries. { nixpkgs, system, nix }: with import (nixpkgs + "/nixos/lib/testing.nix") { inherit system; }; makeTest { machine = { config, lib, pkgs, ... }: { virtualisation.writableStore = true; nix.package = nix; nix.binaryCaches = lib.mkForce [ ]; nix.nixPath = [ "nixpkgs=${lib.cleanSource pkgs.path}" ]; virtualisation.pathsInNixDB = [ pkgs.stdenv pkgs.pkgsi686Linux.stdenv ]; }; testScript = { nodes }: '' startAll; # Copying to /tmp should succeed. $machine->succeed('nix-build --no-sandbox -E \'(with import <nixpkgs> {}; runCommand "foo" {} " mkdir -p $out cp ${pkgs.coreutils}/bin/id /tmp/id ")\' '); $machine->succeed('[[ $(stat -c %a /tmp/id) = 555 ]]'); $machine->succeed("rm /tmp/id"); # Creating a setuid binary should fail. $machine->fail('nix-build --no-sandbox -E \'(with import <nixpkgs> {}; runCommand "foo" {} " mkdir -p $out cp ${pkgs.coreutils}/bin/id /tmp/id chmod 4755 /tmp/id ")\' '); $machine->succeed('[[ $(stat -c %a /tmp/id) = 555 ]]'); $machine->succeed("rm /tmp/id"); # Creating a setgid binary should fail. $machine->fail('nix-build --no-sandbox -E \'(with import <nixpkgs> {}; runCommand "foo" {} " mkdir -p $out cp ${pkgs.coreutils}/bin/id /tmp/id chmod 2755 /tmp/id ")\' '); $machine->succeed('[[ $(stat -c %a /tmp/id) = 555 ]]'); $machine->succeed("rm /tmp/id"); # The checks should also work on 32-bit binaries. $machine->fail('nix-build --no-sandbox -E \'(with import <nixpkgs> { system = "i686-linux"; }; runCommand "foo" {} " mkdir -p $out cp ${pkgs.coreutils}/bin/id /tmp/id chmod 2755 /tmp/id ")\' '); $machine->succeed('[[ $(stat -c %a /tmp/id) = 555 ]]'); $machine->succeed("rm /tmp/id"); # The tests above use fchmodat(). Test chmod() as well. $machine->succeed('nix-build --no-sandbox -E \'(with import <nixpkgs> {}; runCommand "foo" { buildInputs = [ perl ]; } " mkdir -p $out cp ${pkgs.coreutils}/bin/id /tmp/id perl -e \"chmod 0666, qw(/tmp/id) or die\" ")\' '); $machine->succeed('[[ $(stat -c %a /tmp/id) = 666 ]]'); $machine->succeed("rm /tmp/id"); $machine->fail('nix-build --no-sandbox -E \'(with import <nixpkgs> {}; runCommand "foo" { buildInputs = [ perl ]; } " mkdir -p $out cp ${pkgs.coreutils}/bin/id /tmp/id perl -e \"chmod 04755, qw(/tmp/id) or die\" ")\' '); $machine->succeed('[[ $(stat -c %a /tmp/id) = 555 ]]'); $machine->succeed("rm /tmp/id"); # And test fchmod(). $machine->succeed('nix-build --no-sandbox -E \'(with import <nixpkgs> {}; runCommand "foo" { buildInputs = [ perl ]; } " mkdir -p $out cp ${pkgs.coreutils}/bin/id /tmp/id perl -e \"my \\\$x; open \\\$x, qw(/tmp/id); chmod 01750, \\\$x or die\" ")\' '); $machine->succeed('[[ $(stat -c %a /tmp/id) = 1750 ]]'); $machine->succeed("rm /tmp/id"); $machine->fail('nix-build --no-sandbox -E \'(with import <nixpkgs> {}; runCommand "foo" { buildInputs = [ perl ]; } " mkdir -p $out cp ${pkgs.coreutils}/bin/id /tmp/id perl -e \"my \\\$x; open \\\$x, qw(/tmp/id); chmod 04777, \\\$x or die\" ")\' '); $machine->succeed('[[ $(stat -c %a /tmp/id) = 555 ]]'); $machine->succeed("rm /tmp/id"); ''; }