On Sat, Sep 09, 2000 at 09:39:33AM +0200, Tino Wildenhain wrote:
> Terry Kerr wrote:
> > you can write anything destructive, whether it is an external method, a DTML
> > Method, or basically anything. At least if the only way you can import .zexp's
> > is from the import directory, then only people with access to the zope file
> > structure can import stuff...that will usually be restricted to system
> > administrators or superuser people.
> Hm. I dont see the point here. First you can restrict the ability to
> Export/Import in the users role.
> Second, the either the superuser has to be bothered with imports or
> you have to grant all the people access to the file system.
> This would be much lesser security as beeing able to import via web.
> May be I schould have a deeper look at the ownership-problem.
> Giving the importing user ownership over all objects (s)he imports
> as long it is not the superuser, schould do the trick.
The problem is not so much ownership of the objects imported, but the type
of objects that can be instanciated from a pickle (the export format
wether XML or binary, consists of pickled classes).
You can create _everything_ from a pickle, as long as there is a class
definition for it; including a monitor client. I can open up a high port
on your machine that'll let me connect to your Zope process in a python
interpreter prompt. Then your server is my oister.
Allowing imports from arbitrary paths will let me exploit security holes
in other internet daemons on your machine to create a pickle file for
import; preferably the /tmp directory as it is world writeable.
Restricting imports to one directory allows you to be much more
restrictive as to who can write there.
You can set up restricted FTP access or even only allow scp (ssh encrypted
file transfer) for trusted people to upload exports to the Zope import
directory if you need to give others import rights.
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