macOS Mojave: setgroups(501) failed: Too many extra groups

[Heiko W. Rupp]

On Thu, Oct 11, 2018 at 09:51:34AM +0300, Aki Tuomi wrote:
> > Looking at the source, I see this is handled in
> > src/lib/restrict-access.c::fix_groups_list(),
> > where above the call to setgroups() a gid_list2 is constructed. I
> > wonder if one could
> > have a config option to prevent adding all those extra groups, which
> > then make the
> > call to setgroups() fail
 
> Not trivially. We would need to know which groups to drop and which not.

Looking at id output

 id
uid=501(hwr) gid=20(staff) groups=20(staff),6(mail),12(everyone),61(localaccounts),80(admin),98(_lpadmin),500(users),701(com.apple.sharepoint.group.1),702(com.apple.sharepoint.group.2),30(_keytabusers),33(_appstore),100(_lpoperator),204(_developer),250(_analyticsusers),395(com.apple.access_ftp),103(com.apple.access_screensharing-disabled),104(com.apple.access_ssh-disabled)

it seems that all the com.apple ones can easily be dropped.
What about a config list, that the admin can set with a list of gids, that can be dropped/are not added to gid_list2 ?

  Heiko