ssh under newgrp'ed session fails when using HostbasedAuthentication

Solution Verified - Updated -

Issue

  • When using HostbasedAuthentication, performing a ssh command succeeds normally

    $ id
uid=1000 (myuser) gid=1000(myuser) groups=1000(myuser), 100(users)
$ ssh remote-system true
$

  • When using HostbasedAuthentication, performing a ssh command after changing group using newgrp fails

    $ id
uid=1000 (myuser) gid=100(users) groups=100(users), 1000(myuser)
$ newgrp users
$ ssh remote-system true
setresgid 1000: Operation not permitted
ssh_keysign: no reply
key_sign failed
$

Environment

  • Red Hat Enterprise Linux 7
  • openssh

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