[Bug 1771011] Re: Doesn't accept environment variable with underscore in its name in AuthorizedKeysFile

[Joshua Powers]

This did not reproduce in xenial or bionic, so that narrows it down to a
change between 7.7p1-2 (cosmic) and 7.6p1-4 (bionic)

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Title:
  Doesn't accept environment variable with underscore in its name in
  AuthorizedKeysFile

Status in openssh package in Ubuntu:
  Confirmed

Bug description:
  If environment variable name defined in AuthorizedKeysFile contains underscore character (environment="FOO_BAR=1" ...), sshd refuses connection and throws following error:
  authorized_keys:1: bad key options: invalid environment string

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