From f5befbb0d1526f18eb2b24eabb48c3b761c624a2 Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@python.org>
Date: Sat, 24 Mar 2018 18:38:14 +0100
Subject: [PATCH] [3.6] bpo-33127: Compatibility patch for LibreSSL 2.7.0
 (GH-6210) (GH-6214)

LibreSSL 2.7 introduced OpenSSL 1.1.0 API. The ssl module now detects
LibreSSL 2.7 and only provides API shims for OpenSSL < 1.1.0 and
LibreSSL < 2.7.

Documentation updates and fixes for failing tests will be provided in
another patch set.

Signed-off-by: Christian Heimes <christian@python.org>.
(cherry picked from commit 4ca0739c9d97ac7cd45499e0d31be68dc659d0e1)

Co-authored-by: Christian Heimes <christian@python.org>
---
 Lib/test/test_ssl.py                               |  1 +
 .../2018-03-24-15-08-24.bpo-33127.olJmHv.rst       |  1 +
 Modules/_ssl.c                                     | 24 ++++++++++++++--------
 Tools/ssl/multissltests.py                         |  3 ++-
 4 files changed, 20 insertions(+), 9 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2018-03-24-15-08-24.bpo-33127.olJmHv.rst

diff --git Lib/test/test_ssl.py Lib/test/test_ssl.py
index 8dd3b41450..9785a59a7e 100644
--- Lib/test/test_ssl.py
+++ Lib/test/test_ssl.py
@@ -1687,6 +1687,7 @@ class SimpleBackgroundTests(unittest.TestCase):
         self.assertEqual(len(ctx.get_ca_certs()), 1)

     @needs_sni
+    @unittest.skipUnless(hasattr(ssl, "PROTOCOL_TLSv1_2"), "needs TLS 1.2")
     def test_context_setget(self):
         # Check that the context of a connected socket can be replaced.
         ctx1 = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
diff --git Misc/NEWS.d/next/Library/2018-03-24-15-08-24.bpo-33127.olJmHv.rst Misc/NEWS.d/next/Library/2018-03-24-15-08-24.bpo-33127.
olJmHv.rst
new file mode 100644
index 0000000000..635aabbde0
--- /dev/null
+++ Misc/NEWS.d/next/Library/2018-03-24-15-08-24.bpo-33127.olJmHv.rst
@@ -0,0 +1 @@
+The ssl module now compiles with LibreSSL 2.7.1.
diff --git Modules/_ssl.c Modules/_ssl.c
index c54e43c2b4..5e007da858 100644
--- Modules/_ssl.c
+++ Modules/_ssl.c
@@ -101,8 +101,14 @@
 
 #if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
 #  define OPENSSL_VERSION_1_1 1
+#  define PY_OPENSSL_1_1_API 1
 #endif
 
+/* LibreSSL 2.7.0 provides necessary OpenSSL 1.1.0 APIs */
+#if defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER >= 0x2070000fL
+#  define PY_OPENSSL_1_1_API 1
+#endif
+
 /* Openssl comes with TLSv1.1 and TLSv1.2 between 1.0.0h and 1.0.1
     http://www.openssl.org/news/changelog.html
  */
@@ -129,16 +135,18 @@
 #define INVALID_SOCKET (-1)
 #endif
 
-#ifdef OPENSSL_VERSION_1_1
-/* OpenSSL 1.1.0+ */
-#ifndef OPENSSL_NO_SSL2
-#define OPENSSL_NO_SSL2
-#endif
-#else /* OpenSSL < 1.1.0 */
-#if defined(WITH_THREAD)
+/* OpenSSL 1.0.2 and LibreSSL needs extra code for locking */
+#if !defined(OPENSSL_VERSION_1_1) && defined(WITH_THREAD)
 #define HAVE_OPENSSL_CRYPTO_LOCK
 #endif
 
+#if defined(OPENSSL_VERSION_1_1) && !defined(OPENSSL_NO_SSL2)
+#define OPENSSL_NO_SSL2
+#endif
+
+#ifndef PY_OPENSSL_1_1_API
+/* OpenSSL 1.1 API shims for OpenSSL < 1.1.0 and LibreSSL < 2.7.0 */
+
 #define TLS_method SSLv23_method
 
 static int X509_NAME_ENTRY_set(const X509_NAME_ENTRY *ne)
@@ -187,7 +195,7 @@
 {
     return store->param;
 }
-#endif /* OpenSSL < 1.1.0 or LibreSSL */
+#endif /* OpenSSL < 1.1.0 or or LibreSSL < 2.7.0 */
 
 
 enum py_ssl_error {