[Python-checkins] gh-96828: Add an `ssl.OP_ENABLE_KTLS` option (GH-96830)

[gpshead]

https://github.com/python/cpython/commit/9dc08361bef67a331d1609c8629314c0ca5a79d5
commit: 9dc08361bef67a331d1609c8629314c0ca5a79d5
branch: main
author: Illia Volochii <illia.volochii at gmail.com>
committer: gpshead <greg at krypto.org>
date: 2022-11-23T18:24:09-08:00
summary:

gh-96828: Add an `ssl.OP_ENABLE_KTLS` option (GH-96830)

Expose the constant when OpenSSL defines it.

files:
A Misc/NEWS.d/next/Library/2022-09-14-21-56-15.gh-issue-96828.ZoOY5G.rst
M Doc/library/ssl.rst
M Modules/_ssl.c

diff --git a/Doc/library/ssl.rst b/Doc/library/ssl.rst
index 4e6d06dc38d8..08824feeb395 100644
--- a/Doc/library/ssl.rst
+++ b/Doc/library/ssl.rst
@@ -807,6 +807,22 @@ Constants
 
    .. versionadded:: 3.10
 
+.. data:: OP_ENABLE_KTLS
+
+   Enable the use of the kernel TLS. To benefit from the feature, OpenSSL must
+   have been compiled with support for it, and the negotiated cipher suites and
+   extensions must be supported by it (a list of supported ones may vary by
+   platform and kernel version).
+
+   Note that with enabled kernel TLS some cryptographic operations are
+   performed by the kernel directly and not via any available OpenSSL
+   Providers. This might be undesirable if, for example, the application
+   requires all cryptographic operations to be performed by the FIPS provider.
+
+   This option is only available with OpenSSL 3.0.0 and later.
+
+   .. versionadded:: 3.12
+
 .. data:: HAS_ALPN
 
    Whether the OpenSSL library has built-in support for the *Application-Layer
diff --git a/Misc/NEWS.d/next/Library/2022-09-14-21-56-15.gh-issue-96828.ZoOY5G.rst b/Misc/NEWS.d/next/Library/2022-09-14-21-56-15.gh-issue-96828.ZoOY5G.rst
new file mode 100644
index 000000000000..d8a448851f47
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-09-14-21-56-15.gh-issue-96828.ZoOY5G.rst
@@ -0,0 +1,2 @@
+Add an :data:`~ssl.OP_ENABLE_KTLS` option for enabling the use of the kernel
+TLS (kTLS). Patch by Illia Volochii.
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index 2826d1593753..2885774295b0 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -5864,6 +5864,9 @@ sslmodule_init_constants(PyObject *m)
     PyModule_AddIntConstant(m, "OP_IGNORE_UNEXPECTED_EOF",
                             SSL_OP_IGNORE_UNEXPECTED_EOF);
 #endif
+#ifdef SSL_OP_ENABLE_KTLS
+    PyModule_AddIntConstant(m, "OP_ENABLE_KTLS", SSL_OP_ENABLE_KTLS);
+#endif
 
 #ifdef X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT
     PyModule_AddIntConstant(m, "HOSTFLAG_ALWAYS_CHECK_SUBJECT",