168 lines
5.1 KiB
Python
168 lines
5.1 KiB
Python
'''SSL with SNI-support for Python 2.
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This needs the following packages installed:
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* pyOpenSSL (tested with 0.13)
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* ndg-httpsclient (tested with 0.3.2)
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* pyasn1 (tested with 0.1.6)
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To activate it call :func:`~urllib3.contrib.pyopenssl.inject_into_urllib3`.
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This can be done in a ``sitecustomize`` module, or at any other time before
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your application begins using ``urllib3``, like this::
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try:
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import urllib3.contrib.pyopenssl
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urllib3.contrib.pyopenssl.inject_into_urllib3()
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except ImportError:
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pass
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Now you can use :mod:`urllib3` as you normally would, and it will support SNI
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when the required modules are installed.
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'''
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from ndg.httpsclient.ssl_peer_verification import (ServerSSLCertVerification,
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SUBJ_ALT_NAME_SUPPORT)
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from ndg.httpsclient.subj_alt_name import SubjectAltName
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import OpenSSL.SSL
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from pyasn1.codec.der import decoder as der_decoder
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from socket import _fileobject
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import ssl
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from .. import connectionpool
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from .. import util
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__all__ = ['inject_into_urllib3', 'extract_from_urllib3']
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# SNI only *really* works if we can read the subjectAltName of certificates.
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HAS_SNI = SUBJ_ALT_NAME_SUPPORT
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# Map from urllib3 to PyOpenSSL compatible parameter-values.
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_openssl_versions = {
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ssl.PROTOCOL_SSLv23: OpenSSL.SSL.SSLv23_METHOD,
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ssl.PROTOCOL_SSLv3: OpenSSL.SSL.SSLv3_METHOD,
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ssl.PROTOCOL_TLSv1: OpenSSL.SSL.TLSv1_METHOD,
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}
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_openssl_verify = {
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ssl.CERT_NONE: OpenSSL.SSL.VERIFY_NONE,
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ssl.CERT_OPTIONAL: OpenSSL.SSL.VERIFY_PEER,
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ssl.CERT_REQUIRED: OpenSSL.SSL.VERIFY_PEER
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+ OpenSSL.SSL.VERIFY_FAIL_IF_NO_PEER_CERT,
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}
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orig_util_HAS_SNI = util.HAS_SNI
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orig_connectionpool_ssl_wrap_socket = connectionpool.ssl_wrap_socket
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def inject_into_urllib3():
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'Monkey-patch urllib3 with PyOpenSSL-backed SSL-support.'
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connectionpool.ssl_wrap_socket = ssl_wrap_socket
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util.HAS_SNI = HAS_SNI
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def extract_from_urllib3():
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'Undo monkey-patching by :func:`inject_into_urllib3`.'
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connectionpool.ssl_wrap_socket = orig_connectionpool_ssl_wrap_socket
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util.HAS_SNI = orig_util_HAS_SNI
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### Note: This is a slightly bug-fixed version of same from ndg-httpsclient.
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def get_subj_alt_name(peer_cert):
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# Search through extensions
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dns_name = []
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if not SUBJ_ALT_NAME_SUPPORT:
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return dns_name
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general_names = SubjectAltName()
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for i in range(peer_cert.get_extension_count()):
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ext = peer_cert.get_extension(i)
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ext_name = ext.get_short_name()
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if ext_name != 'subjectAltName':
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continue
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# PyOpenSSL returns extension data in ASN.1 encoded form
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ext_dat = ext.get_data()
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decoded_dat = der_decoder.decode(ext_dat,
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asn1Spec=general_names)
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for name in decoded_dat:
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if not isinstance(name, SubjectAltName):
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continue
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for entry in range(len(name)):
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component = name.getComponentByPosition(entry)
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if component.getName() != 'dNSName':
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continue
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dns_name.append(str(component.getComponent()))
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return dns_name
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class WrappedSocket(object):
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'''API-compatibility wrapper for Python OpenSSL's Connection-class.'''
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def __init__(self, connection, socket):
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self.connection = connection
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self.socket = socket
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def makefile(self, mode, bufsize=-1):
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return _fileobject(self.connection, mode, bufsize)
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def settimeout(self, timeout):
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return self.socket.settimeout(timeout)
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def sendall(self, data):
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return self.connection.sendall(data)
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def getpeercert(self, binary_form=False):
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x509 = self.connection.get_peer_certificate()
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if not x509:
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raise ssl.SSLError('')
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if binary_form:
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return OpenSSL.crypto.dump_certificate(
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OpenSSL.crypto.FILETYPE_ASN1,
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x509)
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return {
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'subject': (
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(('commonName', x509.get_subject().CN),),
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),
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'subjectAltName': [
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('DNS', value)
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for value in get_subj_alt_name(x509)
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]
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}
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def _verify_callback(cnx, x509, err_no, err_depth, return_code):
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return err_no == 0
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def ssl_wrap_socket(sock, keyfile=None, certfile=None, cert_reqs=None,
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ca_certs=None, server_hostname=None,
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ssl_version=None):
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ctx = OpenSSL.SSL.Context(_openssl_versions[ssl_version])
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if certfile:
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ctx.use_certificate_file(certfile)
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if keyfile:
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ctx.use_privatekey_file(keyfile)
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if cert_reqs != ssl.CERT_NONE:
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ctx.set_verify(_openssl_verify[cert_reqs], _verify_callback)
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if ca_certs:
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try:
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ctx.load_verify_locations(ca_certs, None)
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except OpenSSL.SSL.Error as e:
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raise ssl.SSLError('bad ca_certs: %r' % ca_certs, e)
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cnx = OpenSSL.SSL.Connection(ctx, sock)
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cnx.set_tlsext_host_name(server_hostname)
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cnx.set_connect_state()
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try:
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cnx.do_handshake()
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except OpenSSL.SSL.Error as e:
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raise ssl.SSLError('bad handshake', e)
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return WrappedSocket(cnx, sock)
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