1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from twisted.internet import ssl
from OpenSSL import SSL, crypto
from twisted.internet._sslverify import _defaultCurveName, ClientTLSOptions, OpenSSLCertificateOptions, \
optionsForClientTLS
import logging
logger = logging.getLogger(__name__)
class ServerContextFactory(ssl.ContextFactory):
"""Factory for PyOpenSSL SSL contexts that are used to handle incoming
connections and to make connections to remote servers."""
def __init__(self, config):
self._context = SSL.Context(SSL.SSLv23_METHOD)
self.configure_context(self._context, config)
@staticmethod
def configure_context(context, config):
try:
_ecCurve = crypto.get_elliptic_curve(_defaultCurveName)
context.set_tmp_ecdh(_ecCurve)
except Exception:
logger.exception("Failed to enable elliptic curve for TLS")
context.set_options(SSL.OP_NO_SSLv2 | SSL.OP_NO_SSLv3)
context.use_certificate_chain_file(config.tls_certificate_file)
if not config.no_tls:
context.use_privatekey(config.tls_private_key)
context.load_tmp_dh(config.tls_dh_params_path)
context.set_cipher_list("!ADH:HIGH+kEDH:!AECDH:HIGH+kEECDH")
def getContext(self):
return self._context
class ClientTLSOptionsNoCertVerification(ClientTLSOptions):
"""Redefinition of ClientTLSOptions to completely ignore certificate
validation. Should be kept in sync with the original class in Twisted.
This version of ClientTLSOptions is only intended for development use."""
def __init__(self, *args, **kwargs):
super(ClientTLSOptionsNoCertVerification, self).__init__(*args, **kwargs)
def do_nothing(*_args, **_kwargs):
pass
self._ctx.set_info_callback(do_nothing)
class ClientTLSOptionsFactory(object):
"""Factory for Twisted ClientTLSOptions that are used to make connections
to remote servers for federation."""
def __init__(self, config):
self._ignore_certificate_validation = config.tls_ignore_certificate_validation
def get_options(self, host):
if self._ignore_certificate_validation:
return ClientTLSOptionsNoCertVerification(
unicode(host),
OpenSSLCertificateOptions(verify=False).getContext()
)
else:
return optionsForClientTLS(unicode(host))
|
