User-defined templates - are they safe? Is FreeMarker a secure sandbox?

"Dobes Vandermeer" <[email protected]>
Newsgroups gmane.comp.web.freemarker.user
Message-ID <[email protected]>
Hello All,

I'd like to use FreeMarker to allow my users to customize the layout and
appearance of reports and invoices.  However, I have to make sure this won't
negatively impact the security of my application.
I'm wondering whether anyone has some ideas about whether rendering
user-defined freemarker templates would create a security hole.  For
example, can you access global classes, the class instance of objects (to
call getClass().getResourceAsStream(...)), or other data outside the scope
of the data passed as a parameter to freemarker?

Has anyone done this before?  Is FreeMarker safe for this use?

Thanks in advance,
Dobes

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