[Proftpd-user] Virtual File System

[Allen F. <pr...@ad...>]

We have been using proftpd for a while now to support "virtual users" that
are authenticated via a database module we tailored and determine a home
directory based on that users settings.
We are looking to improve this a little bit, so that instead of being
permitted to just one directory, they will be able to access several
subdirectories of a common directory, but they will not be permitted to
other subdirectories.  Which directories they can and can't access must be
determined at runtime - we can't just put people into groups and permit the
directory to that group only.

Is there a "virtual file system" module currently available that I don't see
on the module list?  Are there hooks that we can easily tap into to
implement something along these lines?

Appreciated, as always.