STINNER Victor <vstin...@redhat.com> added the comment:
Python 2.7 doesn't support properly OpenSSL 1.1.1 yet, see:
* PR 10607
* PR 10608
I would prefer to have _ssl.OP_ENABLE_MIDDLEBOX_COMPAT rather than have an
hardcoded constant in test_ssl. In master, test_ssl has been fixed and the
constant has been added by:
commit 05d9fe32a1245b9a798e49e0c1eb91f110935b69
Author: Christian Heimes <christ...@python.org>
Date: Tue Feb 27 08:55:39 2018 +0100
bpo-32947: OpenSSL 1.1.1-pre1 / TLS 1.3 fixes (#5663)
* bpo-32947: OpenSSL 1.1.1-pre1 / TLS 1.3 fixes
Misc fixes and workarounds for compatibility with OpenSSL 1.1.1-pre1 and
TLS 1.3 support. With OpenSSL 1.1.1, Python negotiates TLS 1.3 by
default. Some test cases only apply to TLS 1.2. Other tests currently
fail because the threaded or async test servers stop after failure.
I'm going to address these issues when OpenSSL 1.1.1 reaches beta.
OpenSSL 1.1.1 has added a new option OP_ENABLE_MIDDLEBOX_COMPAT for TLS
1.3. The feature is enabled by default for maximum compatibility with
broken middle boxes. Users should be able to disable the hack and CPython's
test suite needs
it to verify default options.
Signed-off-by: Christian Heimes <christ...@python.org>
diff --git a/Doc/library/ssl.rst b/Doc/library/ssl.rst
index 7371024dce..5d5232eda3 100644
--- a/Doc/library/ssl.rst
+++ b/Doc/library/ssl.rst
@@ -831,6 +831,15 @@ Constants
.. versionadded:: 3.3
+.. data:: OP_ENABLE_MIDDLEBOX_COMPAT
+
+ Send dummy Change Cipher Spec (CCS) messages in TLS 1.3 handshake to make
+ a TLS 1.3 connection look more like a TLS 1.2 connection.
+
+ This option is only available with OpenSSL 1.1.1 and later.
+
+ .. versionadded:: 3.8
+
.. data:: OP_NO_COMPRESSION
Disable compression on the SSL channel. This is useful if the application
(...)
----------
nosy: +vstinner
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