SSH Certificate key attributes

[vitalvas]

1. Principals
2. Critical Options
   • force-command
   • source-address (example: "source-address 127.0.0.1,10.10.255.0/24")
3. Extensions
   • permit-X11-forwarding
   • permit-agent-forwarding
   • permit-port-forwarding
   • permit-pty
   • permit-user-rc