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Issue #22641: In asyncio, the default SSL context for client connections is now created using ssl.create_default_context(), for stronger security.

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This commit is contained in:
Antoine Pitrou 2014-10-15 16:58:21 +02:00
parent 7184bac544
commit fd39a89e0e
4 changed files with 60 additions and 17 deletions
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13
Lib/asyncio/selector_events.py
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@ -689,16 +689,17 @@ class _SelectorSslTransport(_SelectorTransport):
if not sslcontext:
# Client side may pass ssl=True to use a default
# context; in that case the sslcontext passed is None.
# The default is the same as used by urllib with
# cadefault=True.
if hasattr(ssl, '_create_stdlib_context'):
sslcontext = ssl._create_stdlib_context(
cert_reqs=ssl.CERT_REQUIRED,
check_hostname=bool(server_hostname))
# The default is secure for client connections.
if hasattr(ssl, 'create_default_context'):
# Python 3.4+: use up-to-date strong settings.
sslcontext = ssl.create_default_context()
if not server_hostname:
sslcontext.check_hostname = False
else:
# Fallback for Python 3.3.
sslcontext = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
sslcontext.options |= ssl.OP_NO_SSLv2
sslcontext.options |= ssl.OP_NO_SSLv3
sslcontext.set_default_verify_paths()
sslcontext.verify_mode = ssl.CERT_REQUIRED