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Fri Apr 8 16:45:22 CEST 2005 · https://mail.python.org/pipermail/python-dev/2005-April/052582.html

You might take a look at zope.security:

   http://svn.zope.org/Zope3/trunk/src/zope/security/

It isn't a capability-based system, but it does address
similar problems and might have some useful ideas.

See the README.txt and untrustedinterpreter.txt.

Jim

Eyal Lotem wrote:
> I would like to experiment with security based on Python references as
> security capabilities.
> 
> Unfortunatly, there are several problems that make Python references
> invalid as capabilities:
> 
> * There is no way to create secure proxies because there are no
> private attributes.
> * Lots of Python objects are reachable unnecessarily breaking the
> principle of least privelege (i.e: object.__subclasses__() etc.)
> 
> I was wondering if any such effort has already begun or if there are
> other considerations making Python unusable as a capability platform?
> 
> (Please cc the reply to my email)
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> Python-Dev at python.org
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-- 
Jim Fulton           mailto:jim at zope.com       Python Powered!
CTO                  (540) 361-1714            http://www.python.org
Zope Corporation     http://www.zope.com       http://www.zope.org

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[Python-Dev] Security capabilities in Python