126 lines
3.5 KiB
Nix
126 lines
3.5 KiB
Nix
# Verify that Linux builds cannot create setuid or setgid binaries.
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{ lib, config, nixpkgs, ... }:
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let
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pkgs = config.nodes.machine.nixpkgs.pkgs;
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in
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{
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name = "setuid";
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nodes.machine =
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{ config, lib, pkgs, ... }:
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{ virtualisation.writableStore = true;
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nix.settings.substituters = lib.mkForce [ ];
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nix.nixPath = [ "nixpkgs=${lib.cleanSource pkgs.path}" ];
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virtualisation.additionalPaths = [ pkgs.stdenvNoCC pkgs.pkgsi686Linux.stdenvNoCC ];
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};
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testScript = { nodes }: ''
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# fmt: off
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start_all()
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# Copying to /tmp should succeed.
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machine.succeed(r"""
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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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""".strip())
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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(r"""
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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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""".strip())
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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(r"""
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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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""".strip())
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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(r"""
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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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""".strip())
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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(r"""
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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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""".strip())
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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(r"""
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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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""".strip())
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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(r"""
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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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""".strip())
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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(r"""
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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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""".strip())
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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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