bpo-33570: TLS 1.3 ciphers for OpenSSL 1.1.1 (GH-6976)
Change TLS 1.3 cipher suite settings for compatibility with OpenSSL 1.1.1-pre6 and newer. OpenSSL 1.1.1 will have TLS 1.3 cipers enabled by default. Also update multissltests and Travis config to test with latest OpenSSL. Signed-off-by: Christian Heimes <christian@python.org>
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Christian Heimes
GitHub
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@ -12,7 +12,7 @@ cache:
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env:
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global:
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- OPENSSL=1.1.0g
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- OPENSSL=1.1.0h
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- OPENSSL_DIR="$HOME/multissl/openssl/${OPENSSL}"
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- PATH="${OPENSSL_DIR}/bin:$PATH"
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# Use -O3 because we don't use debugger on Travis-CI
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@ -169,11 +169,6 @@ purposes.
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3DES was dropped from the default cipher string.
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.. versionchanged:: 3.7
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TLS 1.3 cipher suites TLS_AES_128_GCM_SHA256, TLS_AES_256_GCM_SHA384,
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and TLS_CHACHA20_POLY1305_SHA256 were added to the default cipher string.
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Exceptions
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^^^^^^^^^^
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@ -1601,6 +1596,9 @@ to speed up repeated connections from the same clients.
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when connected, the :meth:`SSLSocket.cipher` method of SSL sockets will
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give the currently selected cipher.
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OpenSSL 1.1.1 has TLS 1.3 cipher suites enabled by default. The suites
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cannot be disabled with :meth:`~SSLContext.set_ciphers`.
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.. method:: SSLContext.set_alpn_protocols(protocols)
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Specify which protocols the socket should advertise during the SSL/TLS
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@ -2695,10 +2695,7 @@ class ThreadedTests(unittest.TestCase):
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def test_ecc_cert(self):
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client_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
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client_context.load_verify_locations(SIGNING_CA)
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client_context.set_ciphers(
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'TLS13-AES-128-GCM-SHA256:TLS13-CHACHA20-POLY1305-SHA256:'
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'ECDHE:ECDSA:!NULL:!aRSA'
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)
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client_context.set_ciphers('ECDHE:ECDSA:!NULL:!aRSA')
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hostname = SIGNED_CERTFILE_ECC_HOSTNAME
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server_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
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@ -3439,17 +3436,16 @@ class ThreadedTests(unittest.TestCase):
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sock.do_handshake()
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self.assertEqual(cm.exception.errno, errno.ENOTCONN)
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def test_default_ciphers(self):
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context = ssl.SSLContext(ssl.PROTOCOL_TLS)
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try:
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# Force a set of weak ciphers on our client context
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context.set_ciphers("DES")
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except ssl.SSLError:
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self.skipTest("no DES cipher available")
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with ThreadedEchoServer(CERTFILE,
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ssl_version=ssl.PROTOCOL_TLS,
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chatty=False) as server:
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with context.wrap_socket(socket.socket()) as s:
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def test_no_shared_ciphers(self):
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client_context, server_context, hostname = testing_context()
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# OpenSSL enables all TLS 1.3 ciphers, enforce TLS 1.2 for test
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client_context.options |= ssl.OP_NO_TLSv1_3
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# Force different suites on client and master
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client_context.set_ciphers("AES128")
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server_context.set_ciphers("AES256")
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with ThreadedEchoServer(context=server_context) as server:
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with client_context.wrap_socket(socket.socket(),
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server_hostname=hostname) as s:
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with self.assertRaises(OSError):
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s.connect((HOST, server.port))
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self.assertIn("no shared cipher", server.conn_errors[0])
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@ -3490,9 +3486,9 @@ class ThreadedTests(unittest.TestCase):
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with context.wrap_socket(socket.socket()) as s:
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s.connect((HOST, server.port))
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self.assertIn(s.cipher()[0], {
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'TLS13-AES-256-GCM-SHA384',
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'TLS13-CHACHA20-POLY1305-SHA256',
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'TLS13-AES-128-GCM-SHA256',
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'TLS_AES_256_GCM_SHA384',
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'TLS_CHACHA20_POLY1305_SHA256',
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'TLS_AES_128_GCM_SHA256',
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})
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self.assertEqual(s.version(), 'TLSv1.3')
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@ -3898,23 +3894,20 @@ class ThreadedTests(unittest.TestCase):
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def test_shared_ciphers(self):
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client_context, server_context, hostname = testing_context()
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if ssl.OPENSSL_VERSION_INFO >= (1, 0, 2):
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client_context.set_ciphers("AES128:AES256")
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server_context.set_ciphers("AES256")
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alg1 = "AES256"
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alg2 = "AES-256"
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else:
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client_context.set_ciphers("AES:3DES")
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server_context.set_ciphers("3DES")
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alg1 = "3DES"
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alg2 = "DES-CBC3"
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expected_algs = [
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"AES256", "AES-256",
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# TLS 1.3 ciphers are always enabled
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"TLS_CHACHA20", "TLS_AES",
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]
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stats = server_params_test(client_context, server_context,
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sni_name=hostname)
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ciphers = stats['server_shared_ciphers'][0]
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self.assertGreater(len(ciphers), 0)
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for name, tls_version, bits in ciphers:
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if not alg1 in name.split("-") and alg2 not in name:
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if not any(alg in name for alg in expected_algs):
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self.fail(name)
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def test_read_write_after_close_raises_valuerror(self):
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@ -0,0 +1,3 @@
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Change TLS 1.3 cipher suite settings for compatibility with OpenSSL
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1.1.1-pre6 and newer. OpenSSL 1.1.1 will have TLS 1.3 cipers enabled by
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default.
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@ -45,16 +45,16 @@ OPENSSL_OLD_VERSIONS = [
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]
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OPENSSL_RECENT_VERSIONS = [
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"1.0.2n",
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"1.1.0g",
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"1.1.1-pre1",
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"1.0.2o",
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"1.1.0h",
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"1.1.1-pre6",
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]
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LIBRESSL_OLD_VERSIONS = [
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]
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LIBRESSL_RECENT_VERSIONS = [
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"2.7.1",
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"2.7.3",
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]
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# store files in ../multissl
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