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/boto-2.5.2/boto/contrib/m2helpers.py

#
Python | 52 lines | 29 code | 1 blank | 22 comment | 1 complexity | e7190188da4120d611e236d339f12ca5 MD5 | raw file
 1# Copyright (c) 2006,2007 Jon Colverson
 2#
 3# Permission is hereby granted, free of charge, to any person obtaining a
 4# copy of this software and associated documentation files (the
 5# "Software"), to deal in the Software without restriction, including
 6# without limitation the rights to use, copy, modify, merge, publish, dis-
 7# tribute, sublicense, and/or sell copies of the Software, and to permit
 8# persons to whom the Software is furnished to do so, subject to the fol-
 9# lowing conditions:
10#
11# The above copyright notice and this permission notice shall be included
12# in all copies or substantial portions of the Software.
13#
14# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
16# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
17# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
18# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
20# IN THE SOFTWARE.
21
22"""
23This module was contributed by Jon Colverson.  It provides a couple of helper
24functions that allow you to use M2Crypto's implementation of HTTPSConnection
25rather than the default version in httplib.py.  The main benefit is that
26M2Crypto's version verifies the certificate of the server.
27
28To use this feature, do something like this:
29
30from boto.ec2.connection import EC2Connection
31
32ec2 = EC2Connection(ACCESS_KEY_ID, SECRET_ACCESS_KEY,
33    https_connection_factory=https_connection_factory(cafile=CA_FILE))
34
35See http://code.google.com/p/boto/issues/detail?id=57 for more details.
36"""
37from M2Crypto import SSL
38from M2Crypto.httpslib import HTTPSConnection
39
40def secure_context(cafile=None, capath=None):
41    ctx = SSL.Context()
42    ctx.set_verify(SSL.verify_peer | SSL.verify_fail_if_no_peer_cert, depth=9)
43    if ctx.load_verify_locations(cafile=cafile, capath=capath) != 1:
44        raise Exception("Couldn't load certificates")
45    return ctx
46
47def https_connection_factory(cafile=None, capath=None):
48    def factory(*args, **kwargs):
49        return HTTPSConnection(
50            ssl_context=secure_context(cafile=cafile, capath=capath),
51                *args, **kwargs)
52    return (factory, (SSL.SSLError,))