[Bf-committers] Python sandbox

Leif Andersen leif.a.andersen at gmail.com
Wed Mar 17 14:16:26 CET 2010

I was thinking of submitting a GSoC proposal about this, although just a sub
section of it, for as you point out, it is a rather large project.

It would make sense to me, to include python, as a separate module when the
user downloads blender.  It then checks to see if python has been installed
on the system, if it hasn't, it will install it, if it has, it will use it
(after checking to make sure that it hasn't been tampered with to the point
where it's unusable).

~Leif Andersen

On Wed, Mar 17, 2010 at 04:02, Campbell Barton <ideasman42 at gmail.com> wrote:

> On Wed, Mar 17, 2010 at 9:50 AM, Ton Roosendaal <ton at blender.org> wrote:
> > Hi all,
> >
> > In past discussions I had the impression that Blender's Python cannot
> > be simply sandboxed because python.org doesn't cooperate with it.
> > Second reason was that Blender apparently is one of the few apps
> > embedding Python on such a level.
> >
> > Philipp Guehring sent me these links and a suggestion:
> >
> > http://sayspy.blogspot.com/2007/05/i-have-finished-securing-python.html
> This would mean we would have to distribute blender with a totally
> limited python, exporters, importers wouldnt work right. it also
> removes functions we're relying on for some 2.5 internals.
> > http://people.cs.ubc.ca/~drifty/papers/python_security.pdf<http://people.cs.ubc.ca/%7Edrifty/papers/python_security.pdf>
> fairly easy to work around, edited namespace can be circumvented by...
> f =  [ t for t in (1).__class__.__mro__[-1].__subclasses__() if
> t.__name__ == 'file'][0]('/some_file.txt', 'w')
> > http://svn.python.org/view/python/branches/bcannon-objcap/
> apparently proof of concept sandbox branch of python, cant get info on
> this easily, looks to be 2 years old.
> > http://codespeak.net/pypy/dist/pypy/doc/sandbox.html
> pypy cant be used since we rely on C/Python
> >
> http://lackingrhoticity.blogspot.com/2009/06/python-standard-library-in-native.html
> Also cant be used because we need C/Python API
> >
> > Perhaps a Google SoC project to secure Blender's Python could help here.
> >
> > -Ton-
> I'm not interested in this for a few reasons...
> * Its a lot of work, even python guys have trouble to do this well and
> there are way more python developers then blenders.
> * If we had a totally sandboxed python this would limit scripts to the
> point where scripts would not be able to do basic tasks (exporting,
> writing files etc).
> * If people start running a sandboxed blender this is a mode many
> scripts need to support, a little like we had with 2.4x where we would
> have to check if a fill python was installed, complain if it wasn't,
> tell them to install etc.
> if this goes ahead Id at least make sure it could be disabled at
> compile time, but I really prefer it doesn't.
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