[Zope] Re: Blocking Sibling inheritance

[Greg Fischer]

Security issue?  I think you are partially right about it not being a
security issue because Zope does what it is supposed to do and look
where it should.

Here is a security issue relating to this acquisition:  (IMHO)

I have folder 1:  /site/dev/customer1/folder/page
And folder 1:    /site/dev/customer2/folder1/folder2/page

Eash customer level folder has acl_users with different/separate
accounts.  The security at the customer level folder is set to not
acquire and no anonymous access.  Now here is the problem I see, you
type in your URL:
someplace.com/site/dev/customer1/folder/page

You are asked to authenticate.  Then you change your url after
authentication to:
somplace.com/site/dev/customer1/folder/customer2/folder1/folder1/page

And you get right in with no authentication!  That should not be allowable.

I understand that this would require someone to know the folder
structures, but really, in a more simplistic example, all you would
need to know is the other client folder name, and you would have
access.

So what can we do about this?  If you dont have acl-users account in a
folder you access, you should NOT be able to see the contents.  Right?

This may be a new subject, I dont mean to stray off topic.


On Thu, 3 Mar 2005 01:20:32 -0700, kosh <kosh at aesaeion.com> wrote:
> On Thursday 03 March 2005 1:06 am, Dario Lopez-Kästen wrote:
> > Tres Seaver wrote:
> > > -----BEGIN PGP SIGNED MESSAGE-----
> > > Hash: SHA1
> > >
> > > Jay Zeemer wrote:
> > > | Greetings all,
> > > | I am in the process of examining Zope for some possible applications.
> > > | Currently I am having an issue with Zope being a bit to smart.  I have
> > > | a directory \Dir1\ and under it I have 2 subdirectories \Dir1\SubA\ and
> > > | \Dir1\SubB\.  The problem I am having is I can go to \Dir1\SubA\SubB\
> > > | and gain access to things that are in \Dir1\SubB\, I need to be able to
> > > | block sibling level inheritance.  Is this possible in Zope??  Or are
> > > | there any other ways to block this with out creating a SubB object in
> > >
> > > \Dir1\SubA\ ??
> > >
> > > The "sibling inheritance" you are describing is Zope's "acquisition".
> > > Folders derive from Acquisition.Implicit, which means they are willing
> > > to acquire any "non-private" name from their parents.
> > >
> > > To prevent this behavior, place SubA with a Folder-like object which
> > > derives instead from Acquisition.Explicit.
> >
> > I'd need this too. Would I be making a correct assumption when stating
> > that no such folderish product, such as a "aq-blocking Folder", exists
> > yet, but it has to be written (ie by me or anyonelse needing this
> > functionality)?
> >
> > Thanks.
> >
> 
> I don't know of something like this existing and even more I don't know why
> you would really want it. Eventually you will understand how and why
> acquisition works and then you would have a fair bit of work to do to change
> the stuff back. Zope is not publishing any object that the person viewing the
> site would not normally have access to so it is not  security issue.
> 
> What you probably need to do is read the zope book and read about how
> acquisition works. You can use it to make apps a lot faster and save yourself
> a lot of work by learning how to use it. Acquisition is a major reason that I
> use zope in the first place and have been using it for about 4 years now.
> _______________________________________________
> Zope maillist  -  Zope at zope.org
> http://mail.zope.org/mailman/listinfo/zope
> **   No cross posts or HTML encoding!  **
> (Related lists -
>  http://mail.zope.org/mailman/listinfo/zope-announce
>  http://mail.zope.org/mailman/listinfo/zope-dev )
> 


-- 
Greg Fischer
1st Byte Solutions
http://www.1stbyte.com