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[3.9] bpo-43794: OpenSSL 3.0.0: set OP_IGNORE_UNEXPECTED_EOF by default (GH-25309) by miss-islington · Pull Request #25313 · python/cpython · GitHub

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[3.9] bpo-43794: OpenSSL 3.0.0: set OP_IGNORE_UNEXPECTED_EOF by default (GH-25309) #25313

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Merged
miss-islington merged 1 commit into from
Apr 9, 2021
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[3.9] bpo-43794: OpenSSL 3.0.0: set OP_IGNORE_UNEXPECTED_EOF by default (GH-25309) #25313

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8 changes: 8 additions & 0 deletions Doc/library/ssl.rst
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Expand Up @@ -886,6 +886,14 @@ Constants

.. versionadded:: 3.6

.. data:: OP_IGNORE_UNEXPECTED_EOF

Ignore unexpected shutdown of TLS connections.

This option is only available with OpenSSL 3.0.0 and later.

.. versionadded:: 3.10

.. data:: HAS_ALPN

Whether the OpenSSL library has built-in support for the *Application-Layer
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4 changes: 3 additions & 1 deletion Lib/test/test_ssl.py
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Expand Up @@ -147,6 +147,7 @@ def data_file(*name):
OP_SINGLE_ECDH_USE = getattr(ssl, "OP_SINGLE_ECDH_USE", 0)
OP_CIPHER_SERVER_PREFERENCE = getattr(ssl, "OP_CIPHER_SERVER_PREFERENCE", 0)
OP_ENABLE_MIDDLEBOX_COMPAT = getattr(ssl, "OP_ENABLE_MIDDLEBOX_COMPAT", 0)
OP_IGNORE_UNEXPECTED_EOF = getattr(ssl, "OP_IGNORE_UNEXPECTED_EOF", 0)

# Ubuntu has patched OpenSSL and changed behavior of security level 2
# see https://bugs.python.org/issue41561#msg389003
Expand Down Expand Up @@ -1164,7 +1165,8 @@ def test_options(self):
# SSLContext also enables these by default
default |= (OP_NO_COMPRESSION | OP_CIPHER_SERVER_PREFERENCE |
OP_SINGLE_DH_USE | OP_SINGLE_ECDH_USE |
OP_ENABLE_MIDDLEBOX_COMPAT)
OP_ENABLE_MIDDLEBOX_COMPAT |
OP_IGNORE_UNEXPECTED_EOF)
self.assertEqual(default, ctx.options)
ctx.options |= ssl.OP_NO_TLSv1
self.assertEqual(default | ssl.OP_NO_TLSv1, ctx.options)
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2021-04-09-16-14-22.bpo-43794.-1XPDH.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Add :data:`ssl.OP_IGNORE_UNEXPECTED_EOF` constants (OpenSSL 3.0.0)
8 changes: 8 additions & 0 deletions Modules/_ssl.c
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Expand Up @@ -3212,6 +3212,10 @@ _ssl__SSLContext_impl(PyTypeObject *type, int proto_version)
#endif
#ifdef SSL_OP_SINGLE_ECDH_USE
options |= SSL_OP_SINGLE_ECDH_USE;
#endif
#ifdef SSL_OP_IGNORE_UNEXPECTED_EOF
/* Make OpenSSL 3.0.0 behave like 1.1.1 */
options |= SSL_OP_IGNORE_UNEXPECTED_EOF;
#endif
SSL_CTX_set_options(self->ctx, options);

Expand Down Expand Up @@ -6270,6 +6274,10 @@ PyInit__ssl(void)
PyModule_AddIntConstant(m, "OP_NO_RENEGOTIATION",
SSL_OP_NO_RENEGOTIATION);
#endif
#ifdef SSL_OP_IGNORE_UNEXPECTED_EOF
PyModule_AddIntConstant(m, "OP_IGNORE_UNEXPECTED_EOF",
SSL_OP_IGNORE_UNEXPECTED_EOF);
#endif

#ifdef X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT
PyModule_AddIntConstant(m, "HOSTFLAG_ALWAYS_CHECK_SUBJECT",
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