Martin Jürgens:
I know some windows servers like filezilla with which realizing such situations is no problem, but I sadly do not have an idea on how to do this with linux
Filezilla's not just for Windows, but it's a client not a server. Were you thinking of something else?
FileZilla - The free FTP solution http://filezilla-project.org/ Open Source (GNU/GPL) FTP client for Windows, Mac OS X and GNU/Linux.