DOKK / manpages / debian 12 / tinysshd / tinysshnoneauthd.8.en
tinysshnoneauthd(8) System Manager's Manual tinysshnoneauthd(8)

tinysshnoneauthd - Tiny SSH daemon with 'none' auth. enabled

tinysshnoneauthd [ options ] keydir

tinysshnoneauthd creates encrypted (but not auhenticated) SSH connection. It's used to protect older protocols which uses e.g. telnet etc.

no error messages
print error messages (default)
print extra information
use syslog instead of standard error output (useful for running from inetd)
don't use syslog, use standard error output (default)
execute the given command instead of spawning the shell (disables exec/subsystem channel requests)
directory containing TinySSH keys, typically /etc/tinyssh/sshkeydir

useradd tinysshnoneauth
mkdir -p /home/tinysshnoneauth/
tinysshd-makekey /home/tinysshnoneauth/sshkeydir
chown -R tinysshnoneauth /home/tinysshnoneauth/sshkeydir
envuidgid tinysshnoneauth tcpserver -UHRDl0 0 2222 /usr/sbin/tinysshnoneauthd -vv -e 'cat /etc/motd' /home/tinysshnoneauth/sshkeydir

tinysshd(8), tinysshd-makekey(8), tinysshd-printkey(8)

https://tinyssh.org/