Description of problem
======================

Having a server with SSLSocket waiting for connections, the incoming connection, failed on automatic do_handshake(), stays open forever — accept() raises the SSLError and does not return client connection socket.

How reproducible
================

146%

Steps to reproduce
==================

server side:

1. create a SOCK_STREAM socket
2. wrap it with wrap_socket()
3. listen()
4. accept()

client side:

1. telnet to this port
2. enter any random text
  

Expected results
================

1. Incoming connection is closed and client disconnected

Actual results
==============

1. On the server side, due to exception, the reference to the incoming connection gets lost.
2. The client stays connected as long as the server operates.

Actually, this issue can lead to unintentional DoS, if a client will try open new connections on a failure — without explicit closing failed ones.

Possible fix
============

Add into do_handshake() something like that:

    try:
        self._sslobj.do_handshake()
    except SSLError as e:
        self._sock.close()
        raise e

Additional info
===============

Python bugzilla issue: http://bugs.python.org/issue17918
Important: only Python2 versions are affected. Python3 works OK.
Possibly related issue: http://bugs.python.org/issue12378 (differs: see the line above)