[Distutils] Autobuild packages using snakebite

Leonardo Santagada santagada at gmail.com
Fri Jun 19 20:43:36 CEST 2009


On Jun 19, 2009, at 11:28 AM, 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.


I think you are completely right... so lets not do that. We should  
whitelist some pgp signatures from people we trust (and some of those  
people should whitelist other people) and then we can have simpler  
virtualization methods that only garantee isolation from one another.  
If we caught someone cheating we remove their signature and all the  
signatures from everyone this person permitted into the autobuild  
farm... and maybe we should ask the person that gave permission to  
this guy.

Or something on these lines.

--
Leonardo Santagada
santagada at gmail.com





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