810 lines
30 KiB
Python
810 lines
30 KiB
Python
# Wrapper module for _ssl. Written by Bill Janssen.
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# Ported to gevent by Denis Bilenko.
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"""SSL wrapper for socket objects on Python 3.
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For the documentation, refer to :mod:`ssl` module manual.
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This module implements cooperative SSL socket wrappers.
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"""
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from __future__ import absolute_import
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import ssl as __ssl__
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_ssl = __ssl__._ssl
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import errno
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from gevent.socket import socket, timeout_default
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from gevent.socket import error as socket_error
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from gevent.socket import timeout as _socket_timeout
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from gevent._util import copy_globals
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from weakref import ref as _wref
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__implements__ = [
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'SSLContext',
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'SSLSocket',
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'get_server_certificate',
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]
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if hasattr(__ssl__, 'wrap_socket'):
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__implements__.append('wrap_socket')
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__extra__ = []
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else:
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__extra__ = [
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'wrap_socket',
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]
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# Manually import things we use so we get better linting.
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# Also, in the past (adding 3.9 support) it turned out we were
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# relying on certain global variables being defined in the ssl module
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# that weren't required to be there, e.g., AF_INET, which should be imported
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# from socket
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from socket import AF_INET
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from socket import SOCK_STREAM
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from socket import SO_TYPE
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from socket import SOL_SOCKET
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from ssl import SSLWantReadError
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from ssl import SSLWantWriteError
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from ssl import SSLEOFError
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from ssl import CERT_NONE
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from ssl import SSLError
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from ssl import SSL_ERROR_EOF
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from ssl import SSL_ERROR_WANT_READ
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from ssl import SSL_ERROR_WANT_WRITE
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from ssl import PROTOCOL_SSLv23
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#from ssl import SSLObject
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from ssl import CHANNEL_BINDING_TYPES
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from ssl import CERT_REQUIRED
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from ssl import DER_cert_to_PEM_cert
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from ssl import create_connection
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# Import all symbols from Python's ssl.py, except those that we are implementing
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# and "private" symbols.
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__imports__ = copy_globals(
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__ssl__, globals(),
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# SSLSocket *must* subclass gevent.socket.socket; see issue 597
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names_to_ignore=__implements__ + ['socket'],
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dunder_names_to_keep=())
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__all__ = __implements__ + __imports__ + __extra__
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if 'namedtuple' in __all__:
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__all__.remove('namedtuple')
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orig_SSLContext = __ssl__.SSLContext # pylint:disable=no-member
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# We have to pass the raw stdlib socket to SSLContext.wrap_socket.
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# That method in turn can pass that object on to things like SNI callbacks.
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# It wouldn't have access to any of the attributes on the SSLSocket, like
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# context, that it's supposed to (see test_ssl.test_sni_callback). Previously
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# we just delegated to the sslsocket with __getattr__, but 3.8
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# added some new callbacks and a test that the object they get is an instance
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# of the high-level SSLSocket class, so that doesn't work anymore. Instead,
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# we wrap the callback and get the real socket to pass on.
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class _contextawaresock(socket._gevent_sock_class):
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__slots__ = ('_sslsock',)
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def __init__(self, family, type, proto, fileno, sslsocket_wref):
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super().__init__(family, type, proto, fileno)
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self._sslsock = sslsocket_wref
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class _Callback(object):
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__slots__ = ('user_function',)
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def __init__(self, user_function):
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self.user_function = user_function
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def __call__(self, conn, *args):
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conn = conn._sslsock()
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return self.user_function(conn, *args)
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class SSLContext(orig_SSLContext):
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__slots__ = ()
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# Added in Python 3.7
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sslsocket_class = None # SSLSocket is assigned later
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def wrap_socket(self, sock, server_side=False,
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do_handshake_on_connect=True,
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suppress_ragged_eofs=True,
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server_hostname=None,
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session=None):
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# pylint:disable=arguments-differ,not-callable
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# (3.6 adds session)
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# Sadly, using *args and **kwargs doesn't work
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return self.sslsocket_class(
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sock=sock, server_side=server_side,
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do_handshake_on_connect=do_handshake_on_connect,
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suppress_ragged_eofs=suppress_ragged_eofs,
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server_hostname=server_hostname,
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_context=self,
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_session=session)
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if hasattr(orig_SSLContext.options, 'setter'):
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# In 3.6, these became properties. They want to access the
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# property __set__ method in the superclass, and they do so by using
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# super(SSLContext, SSLContext). But we rebind SSLContext when we monkey
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# patch, which causes infinite recursion.
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# https://github.com/python/cpython/commit/328067c468f82e4ec1b5c510a4e84509e010f296
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# pylint:disable=no-member
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@orig_SSLContext.options.setter
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def options(self, value):
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super(orig_SSLContext, orig_SSLContext).options.__set__(self, value)
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@orig_SSLContext.verify_flags.setter
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def verify_flags(self, value):
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super(orig_SSLContext, orig_SSLContext).verify_flags.__set__(self, value)
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@orig_SSLContext.verify_mode.setter
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def verify_mode(self, value):
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super(orig_SSLContext, orig_SSLContext).verify_mode.__set__(self, value)
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if hasattr(orig_SSLContext, 'minimum_version'):
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# Like the above, added in 3.7
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# pylint:disable=no-member
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@orig_SSLContext.minimum_version.setter
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def minimum_version(self, value):
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super(orig_SSLContext, orig_SSLContext).minimum_version.__set__(self, value)
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@orig_SSLContext.maximum_version.setter
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def maximum_version(self, value):
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super(orig_SSLContext, orig_SSLContext).maximum_version.__set__(self, value)
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if hasattr(orig_SSLContext, '_msg_callback'):
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# And ditto for 3.8
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# msg_callback is more complex because they want to actually *do* stuff
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# in the setter, so we need to call it. For that to work we temporarily rebind
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# SSLContext back. This function cannot switch, so it should be safe,
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# unless somehow we have multiple threads in a monkey-patched ssl module
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# at the same time, which doesn't make much sense.
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@property
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def _msg_callback(self):
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result = super()._msg_callback
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if isinstance(result, _Callback):
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result = result.user_function
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return result
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@_msg_callback.setter
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def _msg_callback(self, value):
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if value and callable(value):
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value = _Callback(value)
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__ssl__.SSLContext = orig_SSLContext
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try:
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super(SSLContext, SSLContext)._msg_callback.__set__(self, value) # pylint:disable=no-member
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finally:
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__ssl__.SSLContext = SSLContext
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if hasattr(orig_SSLContext, 'sni_callback'):
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# Added in 3.7.
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@property
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def sni_callback(self):
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result = super().sni_callback
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if isinstance(result, _Callback):
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result = result.user_function # pylint:disable=no-member
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return result
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@sni_callback.setter
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def sni_callback(self, value):
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if value and callable(value):
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value = _Callback(value)
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super(orig_SSLContext, orig_SSLContext).sni_callback.__set__(self, value) # pylint:disable=no-member
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else:
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# In newer versions, this just sets sni_callback.
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def set_servername_callback(self, server_name_callback):
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if server_name_callback and callable(server_name_callback):
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server_name_callback = _Callback(server_name_callback)
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super().set_servername_callback(server_name_callback)
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class SSLSocket(socket):
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"""
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gevent `ssl.SSLSocket
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<https://docs.python.org/3/library/ssl.html#ssl-sockets>`_ for
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Python 3.
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"""
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# pylint:disable=too-many-instance-attributes,too-many-public-methods
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def __init__(self, sock=None, keyfile=None, certfile=None,
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server_side=False, cert_reqs=CERT_NONE,
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ssl_version=PROTOCOL_SSLv23, ca_certs=None,
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do_handshake_on_connect=True,
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family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None,
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suppress_ragged_eofs=True, npn_protocols=None, ciphers=None,
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server_hostname=None,
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_session=None, # 3.6
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_context=None):
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# When a *sock* argument is passed, it is used only for its fileno()
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# and is immediately detach()'d *unless* we raise an error.
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# pylint:disable=too-many-locals,too-many-statements,too-many-branches
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if _context:
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self._context = _context
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else:
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if server_side and not certfile:
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raise ValueError("certfile must be specified for server-side "
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"operations")
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if keyfile and not certfile:
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raise ValueError("certfile must be specified")
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if certfile and not keyfile:
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keyfile = certfile
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self._context = SSLContext(ssl_version)
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self._context.verify_mode = cert_reqs
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if ca_certs:
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self._context.load_verify_locations(ca_certs)
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if certfile:
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self._context.load_cert_chain(certfile, keyfile)
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if npn_protocols:
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self._context.set_npn_protocols(npn_protocols)
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if ciphers:
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self._context.set_ciphers(ciphers)
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self.keyfile = keyfile
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self.certfile = certfile
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self.cert_reqs = cert_reqs
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self.ssl_version = ssl_version
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self.ca_certs = ca_certs
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self.ciphers = ciphers
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# Can't use sock.type as other flags (such as SOCK_NONBLOCK) get
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# mixed in.
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if sock.getsockopt(SOL_SOCKET, SO_TYPE) != SOCK_STREAM:
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raise NotImplementedError("only stream sockets are supported")
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if server_side:
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if server_hostname:
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raise ValueError("server_hostname can only be specified "
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"in client mode")
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if _session is not None:
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raise ValueError("session can only be specified "
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"in client mode")
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if self._context.check_hostname and not server_hostname:
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raise ValueError("check_hostname requires server_hostname")
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self._session = _session
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self.server_side = server_side
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self.server_hostname = server_hostname
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self.do_handshake_on_connect = do_handshake_on_connect
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self.suppress_ragged_eofs = suppress_ragged_eofs
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connected = False
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if sock is not None:
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timeout = sock.gettimeout()
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socket.__init__(self,
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family=sock.family,
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type=sock.type,
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proto=sock.proto,
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fileno=sock.fileno())
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self.settimeout(timeout)
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# When Python 3 sockets are __del__, they close() themselves,
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# including their underlying fd, unless they have been detached.
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# Only detach if we succeed in taking ownership; if we raise an exception,
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# then the user might have no way to close us and release the resources.
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sock.detach()
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elif fileno is not None:
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socket.__init__(self, fileno=fileno)
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else:
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socket.__init__(self, family=family, type=type, proto=proto)
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self._closed = False
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self._sslobj = None
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# see if we're connected
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try:
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self._sock.getpeername()
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except socket_error as e:
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if e.errno != errno.ENOTCONN:
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# This file descriptor is hosed, shared or not.
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# Clean up.
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self.close()
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raise
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else:
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connected = True
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self._connected = connected
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if connected:
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# create the SSL object
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try:
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self._sslobj = self.__create_sslobj(server_side, _session)
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if do_handshake_on_connect:
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timeout = self.gettimeout()
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if timeout == 0.0:
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# non-blocking
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raise ValueError("do_handshake_on_connect should not be specified for non-blocking sockets")
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self.do_handshake()
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except socket_error as x:
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self.close()
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raise x
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def _gevent_sock_class(self, family, type, proto, fileno):
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return _contextawaresock(family, type, proto, fileno, _wref(self))
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def _extra_repr(self):
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return ' server=%s, cipher=%r' % (
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self.server_side,
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self._sslobj.cipher() if self._sslobj is not None else ''
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)
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@property
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def context(self):
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return self._context
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@context.setter
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def context(self, ctx):
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self._context = ctx
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self._sslobj.context = ctx
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@property
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def session(self):
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"""The SSLSession for client socket."""
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if self._sslobj is not None:
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return self._sslobj.session
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@session.setter
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def session(self, session):
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self._session = session
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if self._sslobj is not None:
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self._sslobj.session = session
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@property
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def session_reused(self):
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"""Was the client session reused during handshake"""
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if self._sslobj is not None:
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return self._sslobj.session_reused
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def dup(self):
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raise NotImplementedError("Can't dup() %s instances" %
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self.__class__.__name__)
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def _checkClosed(self, msg=None):
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# raise an exception here if you wish to check for spurious closes
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pass
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def _check_connected(self):
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if not self._connected:
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# getpeername() will raise ENOTCONN if the socket is really
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# not connected; note that we can be connected even without
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# _connected being set, e.g. if connect() first returned
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# EAGAIN.
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self.getpeername()
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def read(self, nbytes=2014, buffer=None):
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"""Read up to LEN bytes and return them.
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Return zero-length string on EOF."""
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# pylint:disable=too-many-branches
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self._checkClosed()
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# The stdlib signature is (len=1024, buffer=None)
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# but that shadows the len builtin, and its hard/annoying to
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# get it back.
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initial_buf_len = len(buffer) if buffer is not None else None
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while True:
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if not self._sslobj:
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raise ValueError("Read on closed or unwrapped SSL socket.")
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if nbytes == 0:
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return b'' if buffer is None else 0
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# Negative lengths are handled natively when the buffer is None
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# to raise a ValueError
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try:
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if buffer is not None:
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return self._sslobj.read(nbytes, buffer)
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return self._sslobj.read(nbytes or 1024)
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except SSLWantReadError:
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if self.timeout == 0.0:
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raise
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self._wait(self._read_event, timeout_exc=_SSLErrorReadTimeout)
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except SSLWantWriteError:
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if self.timeout == 0.0:
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raise
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# note: using _SSLErrorReadTimeout rather than _SSLErrorWriteTimeout below is intentional
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self._wait(self._write_event, timeout_exc=_SSLErrorReadTimeout)
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except SSLError as ex:
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if ex.args[0] == SSL_ERROR_EOF and self.suppress_ragged_eofs:
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return b'' if buffer is None else len(buffer) - initial_buf_len
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raise
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# Certain versions of Python, built against certain
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# versions of OpenSSL operating in certain modes, can
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# produce ``ConnectionResetError`` instead of
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# ``SSLError``. Notably, it looks like anything built
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# against 1.1.1c does that? gevent briefly (from support of TLS 1.3
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# in Sept 2019 to issue #1637 it June 2020) caught that error and treaded
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# it just like SSL_ERROR_EOF. But that's not what the standard library does.
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# So presumably errors that result from unexpected ``ConnectionResetError``
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# are issues in gevent tests.
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def write(self, data):
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"""Write DATA to the underlying SSL channel. Returns
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number of bytes of DATA actually transmitted."""
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self._checkClosed()
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while True:
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if not self._sslobj:
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raise ValueError("Write on closed or unwrapped SSL socket.")
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try:
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return self._sslobj.write(data)
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except SSLError as ex:
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if ex.args[0] == SSL_ERROR_WANT_READ:
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if self.timeout == 0.0:
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raise
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self._wait(self._read_event, timeout_exc=_SSLErrorWriteTimeout)
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elif ex.args[0] == SSL_ERROR_WANT_WRITE:
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if self.timeout == 0.0:
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raise
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self._wait(self._write_event, timeout_exc=_SSLErrorWriteTimeout)
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else:
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raise
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def getpeercert(self, binary_form=False):
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"""Returns a formatted version of the data in the
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certificate provided by the other end of the SSL channel.
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Return None if no certificate was provided, {} if a
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certificate was provided, but not validated."""
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self._checkClosed()
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self._check_connected()
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try:
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c = self._sslobj.peer_certificate
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except AttributeError:
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# 3.6
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c = self._sslobj.getpeercert
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return c(binary_form)
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def selected_npn_protocol(self):
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self._checkClosed()
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if not self._sslobj or not _ssl.HAS_NPN:
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return None
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return self._sslobj.selected_npn_protocol()
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if hasattr(_ssl, 'HAS_ALPN'):
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# 3.5+
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def selected_alpn_protocol(self):
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self._checkClosed()
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if not self._sslobj or not _ssl.HAS_ALPN: # pylint:disable=no-member
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return None
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return self._sslobj.selected_alpn_protocol()
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def shared_ciphers(self):
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"""Return a list of ciphers shared by the client during the handshake or
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None if this is not a valid server connection.
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"""
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return self._sslobj.shared_ciphers()
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def version(self):
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"""Return a string identifying the protocol version used by the
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current SSL channel. """
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if not self._sslobj:
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return None
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return self._sslobj.version()
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# We inherit sendfile from super(); it always uses `send`
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def cipher(self):
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self._checkClosed()
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if not self._sslobj:
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return None
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return self._sslobj.cipher()
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def compression(self):
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self._checkClosed()
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if not self._sslobj:
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return None
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return self._sslobj.compression()
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def send(self, data, flags=0, timeout=timeout_default):
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self._checkClosed()
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if timeout is timeout_default:
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timeout = self.timeout
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if self._sslobj:
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if flags != 0:
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raise ValueError(
|
|
"non-zero flags not allowed in calls to send() on %s" %
|
|
self.__class__)
|
|
while True:
|
|
try:
|
|
return self._sslobj.write(data)
|
|
except SSLWantReadError:
|
|
if self.timeout == 0.0:
|
|
return 0
|
|
self._wait(self._read_event)
|
|
except SSLWantWriteError:
|
|
if self.timeout == 0.0:
|
|
return 0
|
|
self._wait(self._write_event)
|
|
else:
|
|
return socket.send(self, data, flags, timeout)
|
|
|
|
def sendto(self, data, flags_or_addr, addr=None):
|
|
self._checkClosed()
|
|
if self._sslobj:
|
|
raise ValueError("sendto not allowed on instances of %s" %
|
|
self.__class__)
|
|
if addr is None:
|
|
return socket.sendto(self, data, flags_or_addr)
|
|
return socket.sendto(self, data, flags_or_addr, addr)
|
|
|
|
def sendmsg(self, *args, **kwargs):
|
|
# Ensure programs don't send data unencrypted if they try to
|
|
# use this method.
|
|
raise NotImplementedError("sendmsg not allowed on instances of %s" %
|
|
self.__class__)
|
|
|
|
def sendall(self, data, flags=0):
|
|
self._checkClosed()
|
|
if self._sslobj:
|
|
if flags != 0:
|
|
raise ValueError(
|
|
"non-zero flags not allowed in calls to sendall() on %s" %
|
|
self.__class__)
|
|
|
|
try:
|
|
return socket.sendall(self, data, flags)
|
|
except _socket_timeout:
|
|
if self.timeout == 0.0:
|
|
# Raised by the stdlib on non-blocking sockets
|
|
raise SSLWantWriteError("The operation did not complete (write)")
|
|
raise
|
|
|
|
def recv(self, buflen=1024, flags=0):
|
|
self._checkClosed()
|
|
if self._sslobj:
|
|
if flags != 0:
|
|
raise ValueError(
|
|
"non-zero flags not allowed in calls to recv() on %s" %
|
|
self.__class__)
|
|
if buflen == 0:
|
|
# https://github.com/python/cpython/commit/00915577dd84ba75016400793bf547666e6b29b5
|
|
# Python #23804
|
|
return b''
|
|
return self.read(buflen)
|
|
return socket.recv(self, buflen, flags)
|
|
|
|
def recv_into(self, buffer, nbytes=None, flags=0):
|
|
self._checkClosed()
|
|
if buffer and (nbytes is None):
|
|
nbytes = len(buffer)
|
|
elif nbytes is None:
|
|
nbytes = 1024
|
|
if self._sslobj:
|
|
if flags != 0:
|
|
raise ValueError("non-zero flags not allowed in calls to recv_into() on %s" % self.__class__)
|
|
return self.read(nbytes, buffer)
|
|
return socket.recv_into(self, buffer, nbytes, flags)
|
|
|
|
def recvfrom(self, buflen=1024, flags=0):
|
|
self._checkClosed()
|
|
if self._sslobj:
|
|
raise ValueError("recvfrom not allowed on instances of %s" %
|
|
self.__class__)
|
|
return socket.recvfrom(self, buflen, flags)
|
|
|
|
def recvfrom_into(self, buffer, nbytes=None, flags=0):
|
|
self._checkClosed()
|
|
if self._sslobj:
|
|
raise ValueError("recvfrom_into not allowed on instances of %s" %
|
|
self.__class__)
|
|
return socket.recvfrom_into(self, buffer, nbytes, flags)
|
|
|
|
def recvmsg(self, *args, **kwargs):
|
|
raise NotImplementedError("recvmsg not allowed on instances of %s" %
|
|
self.__class__)
|
|
|
|
def recvmsg_into(self, *args, **kwargs):
|
|
raise NotImplementedError("recvmsg_into not allowed on instances of "
|
|
"%s" % self.__class__)
|
|
|
|
def pending(self):
|
|
self._checkClosed()
|
|
if self._sslobj:
|
|
return self._sslobj.pending()
|
|
return 0
|
|
|
|
def shutdown(self, how):
|
|
self._checkClosed()
|
|
self._sslobj = None
|
|
socket.shutdown(self, how)
|
|
|
|
def unwrap(self):
|
|
if not self._sslobj:
|
|
raise ValueError("No SSL wrapper around " + str(self))
|
|
|
|
try:
|
|
# 3.7 and newer, that use the SSLSocket object
|
|
# call its shutdown.
|
|
shutdown = self._sslobj.shutdown
|
|
except AttributeError:
|
|
# Earlier versions use SSLObject, which covers
|
|
# that with a layer.
|
|
shutdown = self._sslobj.unwrap
|
|
|
|
s = self._sock
|
|
while True:
|
|
try:
|
|
s = shutdown()
|
|
break
|
|
except SSLWantReadError:
|
|
# Callers of this method expect to get a socket
|
|
# back, so we can't simply return 0, we have
|
|
# to let these be raised
|
|
if self.timeout == 0.0:
|
|
raise
|
|
self._wait(self._read_event)
|
|
except SSLWantWriteError:
|
|
if self.timeout == 0.0:
|
|
raise
|
|
self._wait(self._write_event)
|
|
except SSLEOFError:
|
|
break
|
|
except OSError as e:
|
|
if e.errno == 0:
|
|
# The equivalent of SSLEOFError on unpatched versions of Python.
|
|
# https://bugs.python.org/issue31122
|
|
break
|
|
raise
|
|
|
|
self._sslobj = None
|
|
|
|
# The return value of shutting down the SSLObject is the
|
|
# original wrapped socket passed to _wrap_socket, i.e.,
|
|
# _contextawaresock. But that object doesn't have the
|
|
# gevent wrapper around it so it can't be used. We have to
|
|
# wrap it back up with a gevent wrapper.
|
|
assert s is self._sock
|
|
# In the stdlib, SSLSocket subclasses socket.socket and passes itself
|
|
# to _wrap_socket, so it gets itself back. We can't do that, we have to
|
|
# pass our subclass of _socket.socket, _contextawaresock.
|
|
# So ultimately we should return ourself.
|
|
|
|
# See test_ftplib.py:TestTLS_FTPClass.test_ccc
|
|
return self
|
|
|
|
def _real_close(self):
|
|
self._sslobj = None
|
|
socket._real_close(self)
|
|
|
|
def do_handshake(self):
|
|
"""Perform a TLS/SSL handshake."""
|
|
self._check_connected()
|
|
while True:
|
|
try:
|
|
self._sslobj.do_handshake()
|
|
break
|
|
except SSLWantReadError:
|
|
if self.timeout == 0.0:
|
|
raise
|
|
self._wait(self._read_event, timeout_exc=_SSLErrorHandshakeTimeout)
|
|
except SSLWantWriteError:
|
|
if self.timeout == 0.0:
|
|
raise
|
|
self._wait(self._write_event, timeout_exc=_SSLErrorHandshakeTimeout)
|
|
|
|
# 3.7+, making it difficult to create these objects.
|
|
# There's a new type, _ssl.SSLSocket, that takes the
|
|
# place of SSLObject for self._sslobj. This one does it all.
|
|
def __create_sslobj(self, server_side=False, session=None):
|
|
return self.context._wrap_socket(
|
|
self._sock, server_side, self.server_hostname,
|
|
owner=self._sock, session=session
|
|
)
|
|
|
|
def _real_connect(self, addr, connect_ex):
|
|
if self.server_side:
|
|
raise ValueError("can't connect in server-side mode")
|
|
# Here we assume that the socket is client-side, and not
|
|
# connected at the time of the call. We connect it, then wrap it.
|
|
if self._connected:
|
|
raise ValueError("attempt to connect already-connected SSLSocket!")
|
|
self._sslobj = self.__create_sslobj(False, self._session)
|
|
|
|
try:
|
|
if connect_ex:
|
|
rc = socket.connect_ex(self, addr)
|
|
else:
|
|
rc = None
|
|
socket.connect(self, addr)
|
|
if not rc:
|
|
if self.do_handshake_on_connect:
|
|
self.do_handshake()
|
|
self._connected = True
|
|
return rc
|
|
except socket_error:
|
|
self._sslobj = None
|
|
raise
|
|
|
|
def connect(self, addr):
|
|
"""Connects to remote ADDR, and then wraps the connection in
|
|
an SSL channel."""
|
|
self._real_connect(addr, False)
|
|
|
|
def connect_ex(self, addr):
|
|
"""Connects to remote ADDR, and then wraps the connection in
|
|
an SSL channel."""
|
|
return self._real_connect(addr, True)
|
|
|
|
def accept(self):
|
|
"""
|
|
Accepts a new connection from a remote client, and returns a
|
|
tuple containing that new connection wrapped with a
|
|
server-side SSL channel, and the address of the remote client.
|
|
"""
|
|
newsock, addr = super().accept()
|
|
try:
|
|
newsock = self._context.wrap_socket(
|
|
newsock,
|
|
do_handshake_on_connect=self.do_handshake_on_connect,
|
|
suppress_ragged_eofs=self.suppress_ragged_eofs,
|
|
server_side=True
|
|
)
|
|
return newsock, addr
|
|
except:
|
|
newsock.close()
|
|
raise
|
|
|
|
def get_channel_binding(self, cb_type="tls-unique"):
|
|
"""Get channel binding data for current connection. Raise ValueError
|
|
if the requested `cb_type` is not supported. Return bytes of the data
|
|
or None if the data is not available (e.g. before the handshake).
|
|
"""
|
|
if hasattr(self._sslobj, 'get_channel_binding'):
|
|
# 3.7+, and sslobj is not None
|
|
return self._sslobj.get_channel_binding(cb_type)
|
|
if cb_type not in CHANNEL_BINDING_TYPES:
|
|
raise ValueError("Unsupported channel binding type")
|
|
if cb_type != "tls-unique":
|
|
raise NotImplementedError("{0} channel binding type not implemented".format(cb_type))
|
|
if self._sslobj is None:
|
|
return None
|
|
return self._sslobj.tls_unique_cb()
|
|
|
|
def verify_client_post_handshake(self):
|
|
# Only present in 3.7.1+; an attributeerror is alright
|
|
if self._sslobj:
|
|
return self._sslobj.verify_client_post_handshake()
|
|
raise ValueError("No SSL wrapper around " + str(self))
|
|
|
|
# Python does not support forward declaration of types
|
|
SSLContext.sslsocket_class = SSLSocket
|
|
|
|
# Python 3.2 onwards raise normal timeout errors, not SSLError.
|
|
# See https://bugs.python.org/issue10272
|
|
_SSLErrorReadTimeout = _socket_timeout('The read operation timed out')
|
|
_SSLErrorWriteTimeout = _socket_timeout('The write operation timed out')
|
|
_SSLErrorHandshakeTimeout = _socket_timeout('The handshake operation timed out')
|
|
|
|
|
|
def wrap_socket(sock, keyfile=None, certfile=None,
|
|
server_side=False, cert_reqs=CERT_NONE,
|
|
ssl_version=PROTOCOL_SSLv23, ca_certs=None,
|
|
do_handshake_on_connect=True,
|
|
suppress_ragged_eofs=True,
|
|
ciphers=None):
|
|
|
|
return SSLSocket(sock=sock, keyfile=keyfile, certfile=certfile,
|
|
server_side=server_side, cert_reqs=cert_reqs,
|
|
ssl_version=ssl_version, ca_certs=ca_certs,
|
|
do_handshake_on_connect=do_handshake_on_connect,
|
|
suppress_ragged_eofs=suppress_ragged_eofs,
|
|
ciphers=ciphers)
|
|
|
|
|
|
def get_server_certificate(addr, ssl_version=PROTOCOL_SSLv23, ca_certs=None):
|
|
"""Retrieve the certificate from the server at the specified address,
|
|
and return it as a PEM-encoded string.
|
|
If 'ca_certs' is specified, validate the server cert against it.
|
|
If 'ssl_version' is specified, use it in the connection attempt."""
|
|
|
|
_, _ = addr
|
|
if ca_certs is not None:
|
|
cert_reqs = CERT_REQUIRED
|
|
else:
|
|
cert_reqs = CERT_NONE
|
|
with create_connection(addr) as sock:
|
|
with wrap_socket(sock, ssl_version=ssl_version,
|
|
cert_reqs=cert_reqs, ca_certs=ca_certs) as sslsock:
|
|
dercert = sslsock.getpeercert(True)
|
|
sslsock = sock = None
|
|
return DER_cert_to_PEM_cert(dercert)
|