What options can be put into a SSH authorized_keys file?

Question

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

Answer 1

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

At the moment, those options are:

 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"

Answer 2

Basically, everything valid for your version is documented in sshd(8) manual page, under "AUTHORIZED_KEYS FILE FORMAT".

Answer 3

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"