[Python-Dev] PEP 476: Enabling certificate validation by default!

Nick Coghlan ncoghlan at gmail.com
Mon Sep 1 00:10:58 CEST 2014

On 1 Sep 2014 07:43, "Christian Heimes" <christian at python.org> wrote:
> On 31.08.2014 08:09, Nick Coghlan wrote:
> > As Antoine says here, I'm also opposed to adding more Python specific
> > configuration options. However, I think there may be something
> > worthwhile we can do that's closer to the way browsers work, and has
> > the significant benefit of being implementable as a PyPI module first
> > (more on that in a separate reply).
> I'm on your and Antoine's side and strictly against any additional
> environment variables or command line arguments. That would make the
> whole validation process even more complex and harder to understand.
> There might be a better option to give people and companies the option
> to tune the SSL module to their needs. Python already have a
> customization hook for the site module called sitecustomize. How about
> another module named sslcustomize? Such a module could be used to tune
> the ssl module to the needs of users, e.g. configure a different default
> context, add certificates to a default context etc.
> Companies could install them in a system global directory on their
> servers. Users could put them in their own user site directory and even
> each virtual env can have one sslcustomize of its own. It's fully
> backward compatible, doesn't add any flags and developers have the full
> power of Python for configuration and customization.

And means a user specific store (if one became available) could be
configured there.

Yes, I think this would address my concerns, especially if combined with a
clear recipe in the documentation on how to optionally disable cert
validation at the application layer.

Assuming sslcustomize was in site-packages rather than the standard library
directories, you would also be able to use virtual environments with an
appropriate sslcustomize module to disable cert checking even if the
application you were running didn't support direct configuration.


> Christian
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