part of this can be done with openSSH by setting the banner option in sshd_config. "Banner The contents of the specified file are sent to the remote user befo

part of this can be done with openSSH by setting the banner option in sshd_config. "Banner The contents of the specified file are sent to the remote user before authentication is allowed. If the argument is ``none'' then no banner is displayed. By default, no banner is displayed."