[CentOS] File sharing solution

I would like to offer my isp clients a solution for sharing (big) files, 
basically on one-to-one basis. This is how I imagine it:
- an anonymous or registered user can upload a file
- on response (s)he will get a file-specific (or batch-specific) 
username/password
- (s)he can send a link and un/pw by email
- the receiver can download the file
- the file will be automatically deleted from the server in n days

There must exist an opensource solution for this, but I could not find 
it by google.

Where to look for it?

- Jussi

-- 
Jussi Hirvi * Green Spot
Topeliuksenkatu 15 C * 00250 Helsinki * Finland
Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms)
jussi.hirvi at greenspot.fi * http://www.greenspot.fi