[Mediawiki-l] Sharing upload documents over mediawiki

[Tech Geek]

Hi,

I have a mediawiki installation at:
http://wiki.koolsolutions.com/

I would like to share documents like .doc, .ppt, .pdf, .xls file with my
clients through the "upload File" section. This is what I am looking for:

1. Each client will have separate permissions i.e. a file uploaded by client
1 cannot be accessed (view/modify/delete) by client 2.

2. As an Administrator if I upload a file I can specifically assign which
client has access to the file.

3. A client can also see what files are uploaded on the wiki to which they
have access only.

4. Not anybody can register on the wiki. I specifically create user accounts
for my clients and send them their login info.

5. Similarly for the pages on the wiki, I would like to assign specific
permission to my clients to access them. I guess the best thing would be to
create a separate ground for each client?

What all extensions will I need in order to achive the above? Is there any
best practice for this kind of a scenario?

Your thoughts/inputs are highly appreciated.

Thanks!