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442 lines
17 KiB
442 lines
17 KiB
# Wrapper module for _ssl. Written by Bill Janssen.
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# Ported to gevent by Denis Bilenko.
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"""
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SSL wrapper for socket objects on Python 2.7.8 and below.
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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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.. deprecated:: 1.3
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This module is not secure. Support for Python versions
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with only this level of SSL will be dropped in gevent 1.4.
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"""
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from __future__ import absolute_import
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# Our import magic sadly makes this warning useless
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# pylint: disable=undefined-variable,arguments-differ,no-member
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import ssl as __ssl__
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_ssl = __ssl__._ssl
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import sys
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import errno
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from gevent._socket2 import socket
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from gevent.socket import _fileobject, timeout_default
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from gevent.socket import error as socket_error, EWOULDBLOCK
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from gevent.socket import timeout as _socket_timeout
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from gevent._compat import PYPY
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from gevent._util import copy_globals
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__implements__ = [
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'SSLSocket',
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'wrap_socket',
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'get_server_certificate',
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'sslwrap_simple',
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]
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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(__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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# Py2.6 can get RAND_status added twice
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__all__ = list(set(__implements__) | set(__imports__))
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if 'namedtuple' in __all__:
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__all__.remove('namedtuple')
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class SSLSocket(socket):
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"""
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gevent `ssl.SSLSocket <https://docs.python.org/2.6/library/ssl.html#sslsocket-objects>`_
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for Pythons < 2.7.9.
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"""
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def __init__(self, sock, 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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suppress_ragged_eofs=True,
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ciphers=None):
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socket.__init__(self, _sock=sock)
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if PYPY:
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sock._drop()
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if certfile and not keyfile:
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keyfile = certfile
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# see if it's connected
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try:
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socket.getpeername(self)
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except socket_error as e:
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if e.args[0] != errno.ENOTCONN:
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raise
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# no, no connection yet
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self._sslobj = None
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else:
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# yes, create the SSL object
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if ciphers is None:
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self._sslobj = _ssl.sslwrap(self._sock, server_side,
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keyfile, certfile,
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cert_reqs, ssl_version, ca_certs)
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else:
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self._sslobj = _ssl.sslwrap(self._sock, server_side,
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keyfile, certfile,
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cert_reqs, ssl_version, ca_certs,
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ciphers)
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if do_handshake_on_connect:
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self.do_handshake()
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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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self.do_handshake_on_connect = do_handshake_on_connect
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self.suppress_ragged_eofs = suppress_ragged_eofs
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self._makefile_refs = 0
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def read(self, len=1024):
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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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while True:
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try:
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return self._sslobj.read(len)
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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 ''
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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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sys.exc_clear()
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self._wait(self._read_event, timeout_exc=_SSLErrorReadTimeout)
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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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sys.exc_clear()
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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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else:
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raise
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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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while True:
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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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sys.exc_clear()
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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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sys.exc_clear()
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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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return self._sslobj.peer_certificate(binary_form)
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def cipher(self):
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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 send(self, data, flags=0, timeout=timeout_default):
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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(
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"non-zero flags not allowed in calls to send() on %s" %
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self.__class__)
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while True:
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try:
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v = self._sslobj.write(data)
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except SSLError as x:
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if x.args[0] == SSL_ERROR_WANT_READ:
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if self.timeout == 0.0:
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return 0
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sys.exc_clear()
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self._wait(self._read_event)
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elif x.args[0] == SSL_ERROR_WANT_WRITE:
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if self.timeout == 0.0:
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return 0
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sys.exc_clear()
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self._wait(self._write_event)
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else:
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raise
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else:
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return v
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else:
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return socket.send(self, data, flags, timeout)
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# is it possible for sendall() to send some data without encryption if another end shut down SSL?
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def sendall(self, data, flags=0):
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try:
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socket.sendall(self, data)
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except _socket_timeout as ex:
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if self.timeout == 0.0:
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# Python 2 simply *hangs* in this case, which is bad, but
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# Python 3 raises SSLWantWriteError. We do the same.
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raise SSLError(SSL_ERROR_WANT_WRITE)
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# Convert the socket.timeout back to the sslerror
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raise SSLError(*ex.args)
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def sendto(self, *args):
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if self._sslobj:
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raise ValueError("sendto not allowed on instances of %s" %
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self.__class__)
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else:
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return socket.sendto(self, *args)
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def recv(self, buflen=1024, flags=0):
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if self._sslobj:
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if flags != 0:
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raise ValueError(
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"non-zero flags not allowed in calls to recv() on %s" %
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self.__class__)
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# QQQ Shouldn't we wrap the SSL_WANT_READ errors as socket.timeout errors to match socket.recv's behavior?
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return self.read(buflen)
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return socket.recv(self, buflen, flags)
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def recv_into(self, buffer, nbytes=None, flags=0):
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if buffer and (nbytes is None):
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nbytes = len(buffer)
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elif nbytes is None:
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nbytes = 1024
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if self._sslobj:
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if flags != 0:
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raise ValueError(
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"non-zero flags not allowed in calls to recv_into() on %s" %
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self.__class__)
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while True:
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try:
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tmp_buffer = self.read(nbytes)
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v = len(tmp_buffer)
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buffer[:v] = tmp_buffer
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return v
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except SSLError as x:
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if x.args[0] == SSL_ERROR_WANT_READ:
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if self.timeout == 0.0:
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raise
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sys.exc_clear()
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self._wait(self._read_event)
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continue
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else:
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raise
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else:
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return socket.recv_into(self, buffer, nbytes, flags)
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def recvfrom(self, *args):
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if self._sslobj:
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raise ValueError("recvfrom not allowed on instances of %s" %
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self.__class__)
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else:
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return socket.recvfrom(self, *args)
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def recvfrom_into(self, *args):
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if self._sslobj:
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raise ValueError("recvfrom_into not allowed on instances of %s" %
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self.__class__)
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else:
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return socket.recvfrom_into(self, *args)
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def pending(self):
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if self._sslobj:
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return self._sslobj.pending()
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return 0
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def _sslobj_shutdown(self):
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while True:
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try:
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return self._sslobj.shutdown()
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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 ''
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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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sys.exc_clear()
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self._wait(self._read_event, timeout_exc=_SSLErrorReadTimeout)
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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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sys.exc_clear()
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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 unwrap(self):
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if not self._sslobj:
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raise ValueError("No SSL wrapper around " + str(self))
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s = self._sslobj_shutdown()
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self._sslobj = None
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return socket(_sock=s)
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def shutdown(self, how):
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self._sslobj = None
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socket.shutdown(self, how)
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def close(self):
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if self._makefile_refs < 1:
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self._sslobj = None
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socket.close(self)
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else:
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self._makefile_refs -= 1
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if PYPY:
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def _reuse(self):
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self._makefile_refs += 1
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def _drop(self):
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if self._makefile_refs < 1:
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self.close()
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else:
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self._makefile_refs -= 1
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def do_handshake(self):
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"""Perform a TLS/SSL handshake."""
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while True:
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try:
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return self._sslobj.do_handshake()
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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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sys.exc_clear()
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self._wait(self._read_event, timeout_exc=_SSLErrorHandshakeTimeout)
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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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sys.exc_clear()
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self._wait(self._write_event, timeout_exc=_SSLErrorHandshakeTimeout)
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else:
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raise
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def connect(self, addr):
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"""Connects to remote ADDR, and then wraps the connection in
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an SSL channel."""
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# Here we assume that the socket is client-side, and not
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# connected at the time of the call. We connect it, then wrap it.
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if self._sslobj:
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raise ValueError("attempt to connect already-connected SSLSocket!")
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socket.connect(self, addr)
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if self.ciphers is None:
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self._sslobj = _ssl.sslwrap(self._sock, False, self.keyfile, self.certfile,
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self.cert_reqs, self.ssl_version,
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self.ca_certs)
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else:
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self._sslobj = _ssl.sslwrap(self._sock, False, self.keyfile, self.certfile,
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self.cert_reqs, self.ssl_version,
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self.ca_certs, self.ciphers)
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if self.do_handshake_on_connect:
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self.do_handshake()
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def accept(self):
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"""Accepts a new connection from a remote client, and returns
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a tuple containing that new connection wrapped with a server-side
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SSL channel, and the address of the remote client."""
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sock = self._sock
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while True:
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try:
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client_socket, address = sock.accept()
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break
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except socket_error as ex:
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if ex.args[0] != EWOULDBLOCK or self.timeout == 0.0:
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raise
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sys.exc_clear()
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self._wait(self._read_event)
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sslobj = SSLSocket(client_socket,
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keyfile=self.keyfile,
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certfile=self.certfile,
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server_side=True,
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cert_reqs=self.cert_reqs,
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ssl_version=self.ssl_version,
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ca_certs=self.ca_certs,
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do_handshake_on_connect=self.do_handshake_on_connect,
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suppress_ragged_eofs=self.suppress_ragged_eofs,
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ciphers=self.ciphers)
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return sslobj, address
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def makefile(self, mode='r', bufsize=-1):
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"""Make and return a file-like object that
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works with the SSL connection. Just use the code
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from the socket module."""
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if not PYPY:
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self._makefile_refs += 1
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# close=True so as to decrement the reference count when done with
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# the file-like object.
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return _fileobject(self, mode, bufsize, close=True)
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if PYPY or not hasattr(SSLSocket, 'timeout'):
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# PyPy (and certain versions of CPython) doesn't have a direct
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# 'timeout' property on raw sockets, because that's not part of
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# the documented specification. We may wind up wrapping a raw
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# socket (when ssl is used with PyWSGI) or a gevent socket, which
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# does have a read/write timeout property as an alias for
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# get/settimeout, so make sure that's always the case because
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# pywsgi can depend on that.
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SSLSocket.timeout = property(lambda self: self.gettimeout(),
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lambda self, value: self.settimeout(value))
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_SSLErrorReadTimeout = SSLError('The read operation timed out')
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_SSLErrorWriteTimeout = SSLError('The write operation timed out')
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_SSLErrorHandshakeTimeout = SSLError('The handshake operation timed out')
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def wrap_socket(sock, 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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suppress_ragged_eofs=True, ciphers=None):
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"""Create a new :class:`SSLSocket` instance."""
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return SSLSocket(sock, keyfile=keyfile, certfile=certfile,
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server_side=server_side, cert_reqs=cert_reqs,
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ssl_version=ssl_version, ca_certs=ca_certs,
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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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ciphers=ciphers)
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def get_server_certificate(addr, ssl_version=PROTOCOL_SSLv23, ca_certs=None):
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"""Retrieve the certificate from the server at the specified address,
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and return it as a PEM-encoded string.
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If 'ca_certs' is specified, validate the server cert against it.
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If 'ssl_version' is specified, use it in the connection attempt."""
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if ca_certs is not None:
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cert_reqs = CERT_REQUIRED
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else:
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cert_reqs = CERT_NONE
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s = wrap_socket(socket(), ssl_version=ssl_version,
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cert_reqs=cert_reqs, ca_certs=ca_certs)
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s.connect(addr)
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dercert = s.getpeercert(True)
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s.close()
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return DER_cert_to_PEM_cert(dercert)
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def sslwrap_simple(sock, keyfile=None, certfile=None):
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"""A replacement for the old socket.ssl function. Designed
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for compatibility with Python 2.5 and earlier. Will disappear in
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Python 3.0."""
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return SSLSocket(sock, keyfile, certfile)
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