[issue28747] Expose SSL_CTX_set_cert_verify_callback

[Steve Dower]

Steve Dower added the comment:

The current _3.patch builds on default without warning and the tests pass (_2.patch is the one Ned tried).

Any objections to committing this into 3.7?

What about 3.6.1? As an additive and easy to detect API, I think it's suitable, and I will certainly use it (right now my library's setup.py depends on having each libeay.lib from each original CPython build handy to get some of the functions out of it - these files are about 50MB each, so it's a little painful).

If it helps, I'm happy to add a warning to the docs that setting the callback may cause a loss of security if the callback does not properly validate the certificate (or some wording to that effect). Personally I think that's fairly well implied though, as there isn't any other obvious use for the callback.

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<http://bugs.python.org/issue28747>
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