[Bug 230092] [gce] Fix sshd: Remove arcfour ciphers on gce

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230092

--- Comment #7 from commit-hook at freebsd.org ---
A commit references this bug:

Author: cem
Date: Sat Jul 28 19:35:49 UTC 2018
New revision: 336836
URL: https://svnweb.freebsd.org/changeset/base/336836

Log:
  Remove insecure ciphers from GCE sshd configuration

  They were added for unclear reasons in r277263.  The current OpenSSH
  defaults (7.5+) are reasonable, and do not include the insecure rc4 cipher:

                     chacha20-poly1305 at openssh.com,
                     aes128-ctr,aes192-ctr,aes256-ctr,
                     aes128-gcm at openssh.com,aes256-gcm at openssh.com,
                     aes128-cbc,aes192-cbc,aes256-cbc

  I think I recall there being a reason for a specific list of ciphers on GCE
  at the time, but I do not recall what it was, and cannot find any
  current GCE documentation of such a list.

  So, just revert the explicit configuration and use sane openssh defaults.

  PR:           230092
  Submitted by: Gustavo Scalet <gustavo.scalet AT collabora.com>
  MFC after:    3 days
  Security:     yes

Changes:
  head/release/tools/gce.conf

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