From 7b40cb7293cb14e5c7c8ed123efaf9acb33edae2 Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@python.org>
Date: Tue, 15 Aug 2017 10:33:43 +0200
Subject: [PATCH] bpo-30714: ALPN changes for OpenSSL 1.1.0f (#2305)

OpenSSL 1.1.0 to 1.1.0e aborted the handshake when server and client
could not agree on a protocol using ALPN. OpenSSL 1.1.0f changed that.
The most recent version now behaves like OpenSSL 1.0.2 again. The ALPN
callback can pretend to not been set.

See https://github.com/openssl/openssl/pull/3158 for more details

Signed-off-by: Christian Heimes <christian@python.org>

Upstream-Status: Backport
[https://github.com/python/cpython/commit/7b40cb7293cb14e5c7c8ed123efaf9acb33edae2]

Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
---
 Doc/library/ssl.rst                                          | 5 +++--
 Lib/test/test_ssl.py                                         | 5 +++--
 .../next/Tests/2017-07-25-15-27-44.bpo-30715.Sp7bTF.rst      | 2 ++
 3 files changed, 8 insertions(+), 4 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Tests/2017-07-25-15-27-44.bpo-30715.Sp7bTF.rst

diff --git a/Doc/library/ssl.rst b/Doc/library/ssl.rst
index 729a239a1b..0a09e7e9d4 100644
--- a/Doc/library/ssl.rst
+++ b/Doc/library/ssl.rst
@@ -1447,8 +1447,9 @@ to speed up repeated connections from the same clients.
    This method will raise :exc:`NotImplementedError` if :data:`HAS_ALPN` is
    False.
 
-   OpenSSL 1.1.0+ will abort the handshake and raise :exc:`SSLError` when
-   both sides support ALPN but cannot agree on a protocol.
+   OpenSSL 1.1.0 to 1.1.0e will abort the handshake and raise :exc:`SSLError`
+   when both sides support ALPN but cannot agree on a protocol. 1.1.0f+
+   behaves like 1.0.2, :meth:`SSLSocket.selected_alpn_protocol` returns None.
 
    .. versionadded:: 3.5
 
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index d960d82065..104b7f377a 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -3268,8 +3268,9 @@ if _have_threads:
                 except ssl.SSLError as e:
                     stats = e
 
-                if expected is None and IS_OPENSSL_1_1:
-                    # OpenSSL 1.1.0 raises handshake error
+                if (expected is None and IS_OPENSSL_1_1
+                        and ssl.OPENSSL_VERSION_INFO < (1, 1, 0, 6)):
+                    # OpenSSL 1.1.0 to 1.1.0e raises handshake error
                     self.assertIsInstance(stats, ssl.SSLError)
                 else:
                     msg = "failed trying %s (s) and %s (c).\n" \
diff --git a/Misc/NEWS.d/next/Tests/2017-07-25-15-27-44.bpo-30715.Sp7bTF.rst b/Misc/NEWS.d/next/Tests/2017-07-25-15-27-44.bpo-30715.Sp7bTF.rst
new file mode 100644
index 0000000000..88394e585c
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2017-07-25-15-27-44.bpo-30715.Sp7bTF.rst
@@ -0,0 +1,2 @@
+Address ALPN callback changes for OpenSSL 1.1.0f. The latest version behaves
+like OpenSSL 1.0.2 and no longer aborts handshake.
-- 
2.17.1

