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I found this article on options that can be put before a key in the authorized_keys file. I was wondering though, are there more? Options listed in the article are

  • from="domain"
  • command="commandtorun"
  • no-port-forwarding
  • no-X11-forwarding
  • no-agent-forwarding
  • no-pty
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3 Answers

up vote 11 down vote accepted

All options are detailed in the sshd(8) man page; search for AUTHORIZED_KEYS FILE FORMAT.

At the moment, those options are:

  • cert-authority
  • command="command"
  • environment="NAME=value"
  • from="pattern-list"
  • no-agent-forwarding
  • no-port-forwarding
  • no-pty
  • no-user-rc
  • no-X11-forwarding
  • permitopen="host:port"
  • principals="principals"
  • tunnel="n"
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ah... that's the man page I was looking for. Thanks –  mozillalives May 18 '10 at 14:22
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Basically, everything valid for your version is documented in sshd(8) manual page, under "AUTHORIZED_KEYS FILE FORMAT".

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Check 'man sshd' on your local unix-ish box for more info. My osx box has the following:

  • command="command"
  • environment="NAME=value"
  • from="pattern-list"
  • no-agent-forwarding
  • no-port-forwarding
  • no-pty
  • no-user-rc
  • no-X11-forwarding
  • permitopen="host:port"
  • tunnel="n"
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