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update-users-groups.pl: create intermediate home directories as 0755 #50857

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update-users-groups.pl: create intermediate home directories as 0755 #50857

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cyounkins
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Motivation for this change

Creates directories between / and the home directory as 0755 instead of 0700.

Fixes #10888 where users with home dirs outside /home receive "No directory, logging in with HOME=/" upon login and cannot access their home directory.

In the default installation, /home/ is 0755 so I used that for other locations.

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Fits CONTRIBUTING.md.

@Mic92
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Mic92 commented Nov 21, 2018 •
edited

I am not sure if really we should fix this in NixOS or leave it up to the user to make sure the access is right. We don't really know, what the intention of the users is in that case. The upper directory could be also owned by the user itself.

A simple fix could be a user could apply is:

systemd.tmpfiles.rules = [
  "d /some/home 0755 root root"
];

@cyounkins cyounkins mentioned this pull request Dec 10, 2018
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infinisil
infinisil reviewed Aug 9, 2019
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Even though this might not be the best solution, it's a solution, and I think this is better to merge this than continue leaving it broken.

Unless somebody brings up a good reason this shouldn't be done I'll merge this soon

nixos/modules/config/update-users-groups.pl
make_path($u->{home}, { mode => 0700 }) if ! -e $u->{home};
if (! -e $u->{home}) {
my @dirs = splitdir($u->{home});
make_path(catdir(@dirs[0..$#dirs - 1]), { mode => 0755 });
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Wouldn't it be simpler to only call make_path on the last component? That functions seems to create all intermediate directories already

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stale bot commented Jun 1, 2020

Thank you for your contributions.
This has been automatically marked as stale because it has had no activity for 180 days.
If this is still important to you, we ask that you leave a comment below. Your comment can be as simple as "still important to me". This lets people see that at least one person still cares about this. Someone will have to do this at most twice a year if there is no other activity.
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@stale stale bot added the 2.status: stale https://github.com/NixOS/nixpkgs/blob/master/.github/STALE-BOT.md label Jun 1, 2020
@Mic92
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Mic92 commented Jun 5, 2020

Even though this might not be the best solution, it's a solution, and I think this is better to merge this than continue leaving it broken.

Unless somebody brings up a good reason this shouldn't be done I'll merge this soon

See my concern above: #50857 (comment)

It's easier for someone, who uses weird home directories to also take care of fixing the ownership with tmpfiles rules rather than working around our assumptions that we do when creating the user's home directory.

@stale stale bot removed the 2.status: stale https://github.com/NixOS/nixpkgs/blob/master/.github/STALE-BOT.md label Jun 5, 2020
@Mic92 Mic92 closed this Jun 5, 2020
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Incorrect Home Directory Permissions
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@cyounkins @Mic92 @infinisil @GrahamcOfBorg