You say you have a secure environment - BUT you also say your users logon without a password. The two statements are mutually exclusive.
However, leaving that issue aside, I think what you want is to have your users share access to an Ibay (or Ibays). Thomasch's advice is correct,
BUT
You also need to do something about password strength for your users on the SME server.
Here is an excerpt from the forums somewhere about password strength:
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Password Strength
Users are complaining the password strength checking is too strong. How do I change it?
First a warning - Far too many systems out there have weak passwords and they will be broken into. Educating your users on the necessity of strong passwords is the best option. If that fails, here is how you change the password strength checking from 'strong' to 'normal', which was the setting in previous versions of SME. Be careful to use the exact capitalization.
config setprop passwordstrength Users normal
config setprop passwordstrength Ibays normal
It is also possible, but strongly discouraged, to disable password strength checking:
config setprop passwordstrength Users none
config setprop passwordstrength Ibays none
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If you set the passswordstrength to none, your SME users can have any password they like -- or none at all.
Then, put the users in a group and give that group read/write (or perhaps read only) access to the Ibay
If you read the manual (
http://wiki.contribs.org/Main_Page) it tells you how to do this.
Cheers
Ian