[utils] Default SSL to TLS. (Fixes #3727)
On 2.x, we now try TLS first, and fall back to the compat 23 (basically anything) afterwards. On 3.4+, we now use the proper function so that we get all the latest security configurations. We allow SSLv3 though for the time being, since a lot of older pages use that. On 3.3, we default to SSLv23 (basically "anything, including TLS") because that has the widest compatibility.
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		| @@ -617,7 +617,7 @@ def make_HTTPS_handler(opts_no_check_certificate, **kwargs): | ||||
|                     self.sock = sock | ||||
|                     self._tunnel() | ||||
|                 try: | ||||
|                     self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file, ssl_version=ssl.PROTOCOL_SSLv3) | ||||
|                     self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file, ssl_version=ssl.PROTOCOL_TLSv1) | ||||
|                 except ssl.SSLError: | ||||
|                     self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file, ssl_version=ssl.PROTOCOL_SSLv23) | ||||
|  | ||||
| @@ -625,8 +625,14 @@ def make_HTTPS_handler(opts_no_check_certificate, **kwargs): | ||||
|             def https_open(self, req): | ||||
|                 return self.do_open(HTTPSConnectionV3, req) | ||||
|         return HTTPSHandlerV3(**kwargs) | ||||
|     else: | ||||
|         context = ssl.SSLContext(ssl.PROTOCOL_SSLv3) | ||||
|     elif hasattr(ssl, 'create_default_context'):  # Python >= 3.4 | ||||
|         context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH) | ||||
|         context.options &= ~ssl.OP_NO_SSLv3  # Allow older, not-as-secure SSLv3 | ||||
|         if opts_no_check_certificate: | ||||
|             context.verify_mode = ssl.CERT_NONE | ||||
|         return compat_urllib_request.HTTPSHandler(context=context, **kwargs) | ||||
|     else:  # Python < 3.4 | ||||
|         context = ssl.SSLContext(ssl.PROTOCOL_SSLv23) | ||||
|         context.verify_mode = (ssl.CERT_NONE | ||||
|                                if opts_no_check_certificate | ||||
|                                else ssl.CERT_REQUIRED) | ||||
|   | ||||
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	 Philipp Hagemeister
					Philipp Hagemeister