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

[ Christian Ehrhardt ]

Since Cosmic is still open and auto-syncing I prepared that as fix [1]
for Debian to sync it in.

[1]: https://salsa.debian.org/ssh-team/openssh/merge_requests/2

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

Status in portable OpenSSH:
  Unknown
Status in openssh package in Ubuntu:
  Triaged

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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