[Python-Dev] Validating SSL By Default (aka Including a Cert Bundle in CPython)

Antoine Pitrou solipsis at pitrou.net
Mon Jun 3 21:52:44 CEST 2013

On Mon, 03 Jun 2013 11:56:45 -0700
Ethan Furman <ethan at stoneleaf.us> wrote:
> On 06/03/2013 11:34 AM, Antoine Pitrou wrote:
> > On Mon, 3 Jun 2013 14:12:34 -0400
> > Donald Stufft wrote:
> >>
> >> I worry with the current situation people will just use TLS connections without realizing it's not being verified and thinking they are "safe".
> >
> > Yet there's quite a visible warning in the docs:
> > http://docs.python.org/dev/library/urllib.request.html
> As has been been mentioned elsewhere, at the very least we should change cadefault to True for secure-type connections. 
>   The dangerous/unexpected behavior should not be the default.

cadefault=True will probably be fail if the system certs are not
properly configured in OpenSSL, e.g. under Windows or with a hand-made
OpenSSL build.
And, because of the way the OpenSSL API works, there's no way of
knowing if it is the case or not:

While I'm not saying we shouldn't try to verify certs by default, doing
so is a little more delicate than "setting cadefault to True",
unfortunately. Bundling our own CA cert store is an option, assuming
Donald or someone else wants to take responsibility for it.



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