PEP 466 includes updating to a newer version of OpenSSL. This may be needed for the ssl module feature backports in issue 21308.

Here's all the patch that should be necessary to do the upgrade.  Running test_ssl on 2.7 with 1.0.1g I do have a failure:
======================================================================
ERROR: test_socketserver (test.test_ssl.ThreadedTests)
Using a SocketServer to create and manage SSL connections.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "P:\ath\to\2.7\cpython\lib\test\test_ssl.py", line 1179, in test_socketserver
    f = urllib.urlopen(url)
  File "P:\ath\to\2.7\cpython\lib\urllib.py", line 87, in urlopen
    return opener.open(url)
  File "P:\ath\to\2.7\cpython\lib\urllib.py", line 208, in open
    return getattr(self, name)(url)
  File "P:\ath\to\2.7\cpython\lib\urllib.py", line 437, in open_https
    h.endheaders(data)
  File "P:\ath\to\2.7\cpython\lib\httplib.py", line 969, in endheaders
    self._send_output(message_body)
  File "P:\ath\to\2.7\cpython\lib\httplib.py", line 829, in _send_output
    self.send(msg)
  File "P:\ath\to\2.7\cpython\lib\httplib.py", line 791, in send
    self.connect()
  File "P:\ath\to\2.7\cpython\lib\httplib.py", line 1176, in connect
    self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file)
  File "P:\ath\to\2.7\cpython\lib\ssl.py", line 392, in wrap_socket
    ciphers=ciphers)
  File "P:\ath\to\2.7\cpython\lib\ssl.py", line 148, in __init__
    self.do_handshake()
  File "P:\ath\to\2.7\cpython\lib\ssl.py", line 310, in do_handshake
    self._sslobj.do_handshake()
IOError: [Errno socket error] [Errno 1] _ssl.c:510: error:140770FC:SSL routines:
SSL23_GET_SERVER_HELLO:unknown protocol
----------------------------------------------------------------------
But this looks closely related to a failure that I have on this machine using 3.4 (which is probably the fault of the way this network is set up):
======================================================================
ERROR: test_socketserver (test.test_ssl.ThreadedTests)
Using a SocketServer to create and manage SSL connections.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "P:\ath\to\3.4\cpython\lib\urllib\request.py", line 1189, in do_open
    h.request(req.get_method(), req.selector, req.data, headers)
  File "P:\ath\to\3.4\cpython\lib\http\client.py", line 1090, in request
    self._send_request(method, url, body, headers)
  File "P:\ath\to\3.4\cpython\lib\http\client.py", line 1128, in _send_request
    self.endheaders(body)
  File "P:\ath\to\3.4\cpython\lib\http\client.py", line 1086, in endheaders
    self._send_output(message_body)
  File "P:\ath\to\3.4\cpython\lib\http\client.py", line 924, in _send_output
    self.send(msg)
  File "P:\ath\to\3.4\cpython\lib\http\client.py", line 859, in send
    self.connect()
  File "P:\ath\to\3.4\cpython\lib\http\client.py", line 1221, in connect
    super().connect()
  File "P:\ath\to\3.4\cpython\lib\http\client.py", line 839, in connect
    self._tunnel()
  File "P:\ath\to\3.4\cpython\lib\http\client.py", line 822, in _tunnel
    message.strip()))
OSError: Tunnel connection failed: 403 Forbidden
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "P:\ath\to\3.4\cpython\lib\test\test_ssl.py",line 2315, in test_socketserver
    f = urllib.request.urlopen(url)
  File "P:\ath\to\3.4\cpython\lib\urllib\request.py", line 153, in urlopen
    return opener.open(url, data, timeout)
  File "P:\ath\to\3.4\cpython\lib\urllib\request.py", line 455, in open
    response = self._open(req, data)
  File "P:\ath\to\3.4\cpython\lib\urllib\request.py", line 473, in _open
    '_open', req)
  File "P:\ath\to\3.4\cpython\lib\urllib\request.py", line 433, in _call_chain
    result = func(*args)
  File "P:\ath\to\3.4\cpython\lib\urllib\request.py", line 1230, in https_open
    context=self._context, check_hostname=self._check_hostname)
  File "P:\ath\to\3.4\cpython\lib\urllib\request.py", line 1192, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error Tunnel connection failed: 403 Forbidden>
----------------------------------------------------------------------
As such, I'll leave it to someone else to properly test this before committing.

I just tried it and had no trouble building and running the ssl tests on Windows.
> python Lib\test\regrtest.py -u network -v test_ssl
> ...
> Ran 38 tests in 7.700s
>
> OK (skipped=2)

Thanks, Steve.  Nick, I assume 1.0.1g is the target version?

Builds & tests ok here on a fresh checkout (of cpython & openssl-1.0.1g)

Yes, since OpenSSL 1.0.2 is still in beta, the target version for 2.7.7 would be 1.0.1g

Steve or Tim, did one of you want to commit this since you can run a clean test?

I can commit it, though I don't know how it'll affect Benjamin's release branch?
(Obviously the build will be fine either way - I had the patch applied for 2.7.7rc1.)

Go ahead and commit; it will be up to Benjamin to cherry-pick it to his release branch (or to ask you to do it).

New changeset f6e47d27f67a by Steve Dower in branch '2.7':
Issue #21462 PEP 466: upgrade OpenSSL in the Python 2.7 Windows builds
http://hg.python.org/cpython/rev/f6e47d27f67a

Looks like the AMD64 buildbot isn't happy with OpenSSL 1.0.1g: http://buildbot.python.org/all/builders/AMD64%20Windows7%20SP1%202.7/builds/1223/steps/compile/logs/stdio
Here's my best stab-in-the-dark guess at fixing what's wrong; I don't have the ability to build x64 2.7 handy.

New changeset e90024db8d6c by Benjamin Peterson in branch '2.7':
openssl requires nasm (#21462)
http://hg.python.org/cpython/rev/e90024db8d6c

On Fri, May 30, 2014, at 12:54, Zachary Ware wrote:
>
> Zachary Ware added the comment:
>
> Looks like the AMD64 buildbot isn't happy with OpenSSL 1.0.1g:
> http://buildbot.python.org/all/builders/AMD64%20Windows7%20SP1%202.7/builds/1223/steps/compile/logs/stdio
>
> Here's my best stab-in-the-dark guess at fixing what's wrong; I don't
> have the ability to build x64 2.7 handy.
Good call. That seems to have satisfied the AMD64 bot (at least in the
compile stage).

New changeset 7095a9bfbe76 by Steve Dower in branch '2.7':
Issue #21462 PEP 466: upgrade OpenSSL in the Python 2.7 Windows builds
http://hg.python.org/cpython/rev/7095a9bfbe76
New changeset 8e2cda42b466 by Benjamin Peterson in branch '2.7':
openssl requires nasm (#21462)
http://hg.python.org/cpython/rev/8e2cda42b466

Will this be in 2.7.7? If so, I'll update the draft What's New changes in issue #21569 accordingly (as well as the implementation status in PEP 466)

Yes.
On Sat, May 31, 2014, at 11:30, Nick Coghlan wrote:
>
> Nick Coghlan added the comment:
>
> Will this be in 2.7.7? If so, I'll update the draft What's New changes in
> issue #21569 accordingly (as well as the implementation status in PEP
> 466)
>
> ----------
>
> _______________________________________
> Python tracker <report@bugs.python.org>
> <http://bugs.python.org/issue21462>
> _______________________________________

messages: + msg219422

nosy: + zach.ware
messages: + msg218171

keywords: + patch