[Distutils] Autobuild packages using snakebite

David Cournapeau david at ar.media.kyoto-u.ac.jp
Sat Jun 20 12:17:12 CEST 2009

Stefan Behnel wrote:
> Hi,
> this is really getting off-topic, BTW.
> David Lyon wrote:
>> On Fri, 19 Jun 2009 07:24:21 +0200, Stefan Behnel wrote:
>>> Leonardo Santagada wrote:
>>>> The biggest problem I see is security, but if people are really
>>>> interested in this we could at least try it no?
>>> Security certainly is a major issue here. Anyone can upload packages to
>>> PyPI, so you can run arbitrary code on tons of machines, just by pushing
>>> some well-forged setup.py script there.
>> Doesn't a chroot jail stop this? (on unix anyway)
> Stop it from running arbitrary code? How would it do that?
> Imagine your setup.py downloads Seti at Home jobs from a web site and
> calculates them. You can't really ban web access, as the setup.py script
> may use setuptools to download dependencies. You can't really stop it from
> doing calculations, as it might actually be doing real build stuff like
> source code generation. You can kill it after, say, an hour (or a half if
> you think that no build should take longer than that), but I guess I can
> do a lot of calculations in that time, on a lot of your computers. And if
> you ban my package, I'll just upload a different one with a different
> name. And if you ban my PyPI account, I'll grab a new one. And if you ban
> web access from your machines, well, I'll just upload a package that
> contains the tasks in the archive. And if you use hash codes to check for
> malicious packages, well, I'll just start obfuscating my code and my data.
> And be assured that what I'm really doing is not calculating Seti at Home
> jobs.
> There's really no way you can stop someone from misusing your
> infrastructure if you go for building any arbitrary package that gets
> uploaded to PyPI.

Forbidding any network access from the vm used to build would solve most
of those problems. Controlling CPU/memory can be done from the host OS.
I would be surprised if the openSuse build system worked in a
fundamentally different way: rpm .spec files can also execute arbitrary



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