I'd like to create a no-login account on my OS X (10.6.6) laptop at home so that I can establish a reverse SSH tunnel to it from my desktop at work.
My intention is to create cron job (at work) that periodically checks dropbox for a given file. If it is there, it will establish a reverse tunnel to my laptop at home. I will use SSH keys to eliminate the need to enter a password. However, I don't want just anyone to jump on to my machine and have shell access to my laptop.
Is creating a no-login account to work in this way possible? And, is it reasonable means of maintaining a high level of security?