Expose X509_V_FLAG_ALLOW_PROXY_CERTS in ssl

[chrisburr]

BPO	39342
Nosy	@tiran, @miss-islington, @chrisburr
PRs	bpo-39342: Expose X509_V_FLAG_ALLOW_PROXY_CERTS in ssl module #18011

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/tiran'
closed_at = <Date 2021-03-18.08:24:31.416>
created_at = <Date 2020-01-15.10:03:00.505>
labels = ['expert-SSL', 'type-feature', '3.10']
title = 'Expose X509_V_FLAG_ALLOW_PROXY_CERTS in ssl'
updated_at = <Date 2021-03-18.08:24:31.415>
user = 'https://github.com/chrisburr'

bugs.python.org fields:

activity = <Date 2021-03-18.08:24:31.415>
actor = 'christian.heimes'
assignee = 'christian.heimes'
closed = True
closed_date = <Date 2021-03-18.08:24:31.416>
closer = 'christian.heimes'
components = ['SSL']
creation = <Date 2020-01-15.10:03:00.505>
creator = 'chrisburr'
dependencies = []
files = []
hgrepos = []
issue_num = 39342
keywords = ['patch']
message_count = 3.0
messages = ['360035', '388995', '388996']
nosy_count = 3.0
nosy_names = ['christian.heimes', 'miss-islington', 'chrisburr']
pr_nums = ['18011']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39342'
versions = ['Python 3.10']

[chrisburr]

Enabling proxy certificate validation requires X509_V_FLAG_ALLOW_PROXY_CERTS to be included in the verify flags.[1] This should be exposed as ssl.VERIFY_ALLOW_PROXY_CERTS to match with the other X509_V_FLAG_* variables.

https://www.openssl.org/docs/man1.1.1/man7/proxy-certificates.html

[miss-islington]

New changeset e0b4aa0 by Chris Burr in branch 'master':
bpo-39342: Expose X509_V_FLAG_ALLOW_PROXY_CERTS in ssl module (GH-18011)
e0b4aa0

[tiran]

Thanks for the PR!