Specifies whether root can login using ssh.
If this option is set to "without password", password authentication is disabled for root. Note that other authentication methods (e.g., keyboard-interactive/PAM) may still allow root to login using a password.
If this option is set to "forced commands only", root login with public key authentication will be allowed, but only if the command option has been specified (which may be useful for taking remote backups even if root login is normally not allowed). All other authentication methods are disabled for root.
If this option is set to "no", root is not allowed to login.