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