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bpo-29136: Add TLS 1.3 cipher suites and OP_NO_TLSv1_3 (#1363)

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* bpo-29136: Add TLS 1.3 support

TLS 1.3 introduces a new, distinct set of cipher suites. The TLS 1.3
cipher suites don't overlap with cipher suites from TLS 1.2 and earlier.
Since Python sets its own set of permitted ciphers, TLS 1.3 handshake
will fail as soon as OpenSSL 1.1.1 is released. Let's enable the common
AES-GCM and ChaCha20 suites.

Additionally the flag OP_NO_TLSv1_3 is added. It defaults to 0 (no op) with
OpenSSL prior to 1.1.1. This allows applications to opt-out from TLS 1.3
now.

Signed-off-by: Christian Heimes <christian@python.org>
This commit is contained in:
Christian Heimes 2017-09-07 18:07:00 -07:00 • committed by GitHub
parent 9020ac7cce
commit cb5b68abde
5 changed files with 79 additions and 3 deletions
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28
Doc/library/ssl.rst
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@ -193,11 +193,11 @@ instead.
.. table::
======================== ============ ============ ============= ========= =========== ===========
*client* / **server** **SSLv2** **SSLv3** **TLS** **TLSv1** **TLSv1.1** **TLSv1.2**
*client* / **server** **SSLv2** **SSLv3** **TLS** [3]_ **TLSv1** **TLSv1.1** **TLSv1.2**
------------------------ ------------ ------------ ------------- --------- ----------- -----------
*SSLv2* yes no no [1]_ no no no
*SSLv3* no yes no [2]_ no no no
*TLS* (*SSLv23*) no [1]_ no [2]_ yes yes yes yes
*TLS* (*SSLv23*) [3]_ no [1]_ no [2]_ yes yes yes yes
*TLSv1* no no yes yes no no
*TLSv1.1* no no yes no yes no
*TLSv1.2* no no yes no no yes
@ -206,6 +206,9 @@ instead.
.. rubric:: Footnotes
.. [1] :class:`SSLContext` disables SSLv2 with :data:`OP_NO_SSLv2` by default.
.. [2] :class:`SSLContext` disables SSLv3 with :data:`OP_NO_SSLv3` by default.
.. [3] TLS 1.3 protocol will be available with :data:`PROTOCOL_TLS` in
OpenSSL >= 1.1.1. There is no dedicated PROTOCOL constant for just
TLS 1.3.
.. note::
@ -294,6 +297,11 @@ purposes.
3DES was dropped from the default cipher string.
.. versionchanged:: 3.7
TLS 1.3 cipher suites TLS_AES_128_GCM_SHA256, TLS_AES_256_GCM_SHA384,
and TLS_CHACHA20_POLY1305_SHA256 were added to the default cipher string.
Random generation
^^^^^^^^^^^^^^^^^
@ -764,6 +772,16 @@ Constants
.. versionadded:: 3.4
.. data:: OP_NO_TLSv1_3
Prevents a TLSv1.3 connection. This option is only applicable in conjunction
with :const:`PROTOCOL_TLS`. It prevents the peers from choosing TLSv1.3 as
the protocol version. TLS 1.3 is available with OpenSSL 1.1.1 or later.
When Python has been compiled against an older version of OpenSSL, the
flag defaults to *0*.
.. versionadded:: 3.7
.. data:: OP_CIPHER_SERVER_PREFERENCE
Use the server's cipher ordering preference, rather than the client's.
@ -838,6 +856,12 @@ Constants
.. versionadded:: 3.3
.. data:: HAS_TLSv1_3
Whether the OpenSSL library has built-in support for the TLS 1.3 protocol.
.. versionadded:: 3.7
.. data:: CHANNEL_BINDING_TYPES
List of supported TLS channel binding types. Strings in this list