Supplementary groups not set for AuthorizedKeysCommand

[Johannes Löthberg]

Hey,

We just discovered that when sshd forks to execute the 
AuthorizedKeysCommand, it only runs setres{u,g}id in the new thread, but 
not setgroups, which means that the supplementary groups are never set 
in the new thread.  This feels quite strange, so I was wondering whether 
this is intended behaviour or not.  If not, it would be quite easy to 
fix this.

-- 
Sincerely,
  Johannes Löthberg
  PGP Key ID: 0x50FB9B273A9D0BB5
  PGP Key FP: 5134 EF9E AF65 F95B 6BB1  608E 50FB 9B27 3A9D 0BB5
  https://theos.kyriasis.com/~kyrias/
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