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| Notes about Python Security. == tav's jail == http://tav.espians.com/a-challenge-to-break-python-security.html * Remove evil attributes like frame.f_globals or object.__subclasses__ * Remove evil builtins like compile(), import() or reload() == Zope security == http://svn.zope.org/zope.security/trunk/src/zope/security/ * Sandboxing * Object proxies == Taint mode == Nicole King (cats-muvva.net) wrote a taint mode for CPython 3.0: [[http://www.cats-muvva.net/software/|Python Taint Management]]. Problems: * amaury: ''The patch is indeed huge!'' * fijall: ''it seems that every function that returns a PyObject must be modified'' * fijall: ''need to patch (...) all places that might modify anything. (All side effects)'' => ncoghlan: ''PyPy is still a *much* better platform for that kind of experimentation than CPython'' See also the presentation: [[http://us.pycon.org/common/talkdata/PyCon2007/062/PyCon_2007.pdf|Securing Python: Controling the abilities of the interpreter]], PyCon US 2007, Brett Cannon and Eric Wohlstadter Related issue: [[http://bugs.python.org/issue500698|Taint a la Perl?]]. == Python Security Response Team == Some members: * Brett Cannon Email: security AT python.org == Controlling Access to Resources Within The Python Interpreter == * URL: [[http://sayspy.blogspot.com/2007/04/python-security-paper-online.html|Python security paper online]] * Paper: [[http://www.cs.ubc.ca/~drifty/papers/python_security.pdf|Controlling Access to Resources Within The Python Interpreter]], Brett Cannon and Eric Wohlstadter, University of British Columbia == Sandboxing == * PyPy project: [[http://codespeak.net/pypy/dist/pypy/doc/sandbox.html|PyPy's sandboxing features]]. * [[http://mail.python.org/pipermail/python-dev/2008-September/082475.html|CapPython]] is an object-capability subset of Python, inspired by Joe-E and Caja/Cajita, which are object-capability subsets of Java and Javascript respectively. * SandboxedPython * [[How can I run an untrusted Python script safely (i.e. Sandbox)]] * [[http://mail.python.org/pipermail/python-dev/2009-June/090038.html|CPython in the web browser under Native Client]] == Unsafe modules == * os.kill(), os.chown(), os.unlink(), ... * imageop: many bugs * [[http://bugs.python.org/issue1179|CVE-2007-4965: Integer overflow in imageop module]] (2007-09 .. 2008-08) * [[http://bugs.python.org/issue4317|Buffer overflow in imageop module]] (rgb2rgb8): fixed in Python 2.6.1 and Python 3.0 == Restricted == * Deprecated (disabled?) since Python 2.3 * http://docs.python.org/library/restricted.html * http://docs.python.org/library/rexec.html * http://docs.python.org/library/bastion.html == Fuzzing == Victor Stinner wrote a fuzzer called [[http://fusil.hachoir.org/trac/|Fusil]] to test Python. It already helped to fix many bugs. fusil-python works on Python 2.4 .. 3.0. Fusil was also used on PyPy ([[http://morepypy.blogspot.com/2008/07/finding-bugs-in-pypy-with-fuz.html|Finding Bugs in PyPy with a Fuzzer]]). |
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