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__ssl = __import__('ssl')
from eventlet.patcher import slurp_properties
slurp_properties(__ssl, globals(), srckeys=dir(__ssl))
import sys
from eventlet import greenio, hubs
from eventlet.greenio import (
GreenSocket, CONNECT_ERR, CONNECT_SUCCESS,
)
from eventlet.hubs import trampoline, IOClosed
from eventlet.support import get_errno, PY33
import six
from contextlib import contextmanager
orig_socket = __import__('socket')
socket = orig_socket.socket
timeout_exc = orig_socket.timeout
__patched__ = [
'SSLSocket', 'SSLContext', 'wrap_socket', 'sslwrap_simple',
'create_default_context', '_create_default_https_context']
_original_sslsocket = __ssl.SSLSocket
_original_sslcontext = __ssl.SSLContext
_is_under_py_3_7 = sys.version_info < (3, 7)
_is_py_3_7 = sys.version_info[:2] == (3, 7)
_original_wrap_socket = __ssl.SSLContext.wrap_socket
@contextmanager
def _original_ssl_context(*args, **kwargs):
tmp_sslcontext = _original_wrap_socket.__globals__.get('SSLContext', None)
tmp_sslsocket = _original_sslsocket._create.__globals__.get('SSLSocket', None)
_original_sslsocket._create.__globals__['SSLSocket'] = _original_sslsocket
_original_wrap_socket.__globals__['SSLContext'] = _original_sslcontext
try:
yield
finally:
_original_wrap_socket.__globals__['SSLContext'] = tmp_sslcontext
_original_sslsocket._create.__globals__['SSLSocket'] = tmp_sslsocket
class GreenSSLSocket(_original_sslsocket):
""" This is a green version of the SSLSocket class from the ssl module added
in 2.6. For documentation on it, please see the Python standard
documentation.
Python nonblocking ssl objects don't give errors when the other end
of the socket is closed (they do notice when the other end is shutdown,
though). Any write/read operations will simply hang if the socket is
closed from the other end. There is no obvious fix for this problem;
it appears to be a limitation of Python's ssl object implementation.
A workaround is to set a reasonable timeout on the socket using
settimeout(), and to close/reopen the connection when a timeout
occurs at an unexpected juncture in the code.
"""
def __new__(cls, sock=None, keyfile=None, certfile=None,
server_side=False, cert_reqs=CERT_NONE,
ssl_version=PROTOCOL_SSLv23, ca_certs=None,
do_handshake_on_connect=True, *args, **kw):
if _is_under_py_3_7:
return super(GreenSSLSocket, cls).__new__(cls)
else:
if not isinstance(sock, GreenSocket):
sock = GreenSocket(sock)
with _original_ssl_context():
context = kw.get('_context')
if context:
ret = _original_sslsocket._create(
sock=sock.fd,
server_side=server_side,
do_handshake_on_connect=False,
suppress_ragged_eofs=kw.get('suppress_ragged_eofs', True),
server_hostname=kw.get('server_hostname'),
context=context,
session=kw.get('session'),
)
else:
ret = cls._wrap_socket(
sock=sock.fd,
keyfile=keyfile,
certfile=certfile,
server_side=server_side,
cert_reqs=cert_reqs,
ssl_version=ssl_version,
ca_certs=ca_certs,
do_handshake_on_connect=False,
ciphers=kw.get('ciphers'),
)
ret.keyfile = keyfile
ret.certfile = certfile
ret.cert_reqs = cert_reqs
ret.ssl_version = ssl_version
ret.ca_certs = ca_certs
ret.__class__ = cls
return ret
@staticmethod
def _wrap_socket(sock, keyfile, certfile, server_side, cert_reqs,
ssl_version, ca_certs, do_handshake_on_connect, ciphers):
context = _original_sslcontext(protocol=ssl_version)
context.options |= cert_reqs
if certfile or keyfile:
context.load_cert_chain(
certfile=certfile,
keyfile=keyfile,
)
if ca_certs:
context.load_verify_locations(ca_certs)
if ciphers:
context.set_ciphers(ciphers)
return context.wrap_socket(
sock=sock,
server_side=server_side,
do_handshake_on_connect=do_handshake_on_connect,
)
# we are inheriting from SSLSocket because its constructor calls
# do_handshake whose behavior we wish to override
def __init__(self, sock, keyfile=None, certfile=None,
server_side=False, cert_reqs=CERT_NONE,
ssl_version=PROTOCOL_SSLv23, ca_certs=None,
do_handshake_on_connect=True, *args, **kw):
if not isinstance(sock, GreenSocket):
sock = GreenSocket(sock)
self.act_non_blocking = sock.act_non_blocking
if six.PY2:
# On Python 2 SSLSocket constructor queries the timeout, it'd break without
# this assignment
self._timeout = sock.gettimeout()
if _is_under_py_3_7:
# nonblocking socket handshaking on connect got disabled so let's pretend it's disabled
# even when it's on
super(GreenSSLSocket, self).__init__(
sock.fd, keyfile, certfile, server_side, cert_reqs, ssl_version,
ca_certs, do_handshake_on_connect and six.PY2, *args, **kw)
# the superclass initializer trashes the methods so we remove
# the local-object versions of them and let the actual class
# methods shine through
# Note: This for Python 2
try:
for fn in orig_socket._delegate_methods:
delattr(self, fn)
except AttributeError:
pass
if six.PY3:
# Python 3 SSLSocket construction process overwrites the timeout so restore it
self._timeout = sock.gettimeout()
# it also sets timeout to None internally apparently (tested with 3.4.2)
_original_sslsocket.settimeout(self, 0.0)
assert _original_sslsocket.gettimeout(self) == 0.0
# see note above about handshaking
self.do_handshake_on_connect = do_handshake_on_connect
if do_handshake_on_connect and self._connected:
self.do_handshake()
def settimeout(self, timeout):
self._timeout = timeout
def gettimeout(self):
return self._timeout
def setblocking(self, flag):
if flag:
self.act_non_blocking = False
self._timeout = None
else:
self.act_non_blocking = True
self._timeout = 0.0
def _call_trampolining(self, func, *a, **kw):
if self.act_non_blocking:
return func(*a, **kw)
else:
while True:
try:
return func(*a, **kw)
except SSLError as exc:
if get_errno(exc) == SSL_ERROR_WANT_READ:
trampoline(self,
read=True,
timeout=self.gettimeout(),
timeout_exc=timeout_exc('timed out'))
elif get_errno(exc) == SSL_ERROR_WANT_WRITE:
trampoline(self,
write=True,
timeout=self.gettimeout(),
timeout_exc=timeout_exc('timed out'))
elif _is_py_3_7 and "unexpected eof" in exc.args[1]:
# For reasons I don't understand on 3.7 we get [ssl:
# KRB5_S_TKT_NYV] unexpected eof while reading]
# errors...
raise IOClosed
else:
raise
def write(self, data):
"""Write DATA to the underlying SSL channel. Returns
number of bytes of DATA actually transmitted."""
return self._call_trampolining(
super(GreenSSLSocket, self).write, data)
def read(self, len=1024, buffer=None):
"""Read up to LEN bytes and return them.
Return zero-length string on EOF."""
try:
return self._call_trampolining(
super(GreenSSLSocket, self).read, len, buffer)
except IOClosed:
if buffer is None:
return b''
else:
return 0
def send(self, data, flags=0):
if self._sslobj:
return self._call_trampolining(
super(GreenSSLSocket, self).send, data, flags)
else:
trampoline(self, write=True, timeout_exc=timeout_exc('timed out'))
return socket.send(self, data, flags)
def sendto(self, data, addr, flags=0):
# *NOTE: gross, copied code from ssl.py becase it's not factored well enough to be used as-is
if self._sslobj:
raise ValueError("sendto not allowed on instances of %s" %
self.__class__)
else:
trampoline(self, write=True, timeout_exc=timeout_exc('timed out'))
return socket.sendto(self, data, addr, flags)
def sendall(self, data, flags=0):
# *NOTE: gross, copied code from ssl.py becase it's not factored well enough to be used as-is
if self._sslobj:
if flags != 0:
raise ValueError(
"non-zero flags not allowed in calls to sendall() on %s" %
self.__class__)
amount = len(data)
count = 0
data_to_send = data
while (count < amount):
v = self.send(data_to_send)
count += v
if v == 0:
trampoline(self, write=True, timeout_exc=timeout_exc('timed out'))
else:
data_to_send = data[count:]
return amount
else:
while True:
try:
return socket.sendall(self, data, flags)
except orig_socket.error as e:
if self.act_non_blocking:
raise
erno = get_errno(e)
if erno in greenio.SOCKET_BLOCKING:
trampoline(self, write=True,
timeout=self.gettimeout(), timeout_exc=timeout_exc('timed out'))
elif erno in greenio.SOCKET_CLOSED:
return ''
raise
def recv(self, buflen=1024, flags=0):
return self._base_recv(buflen, flags, into=False)
def recv_into(self, buffer, nbytes=None, flags=0):
# Copied verbatim from CPython
if buffer and nbytes is None:
nbytes = len(buffer)
elif nbytes is None:
nbytes = 1024
# end of CPython code
return self._base_recv(nbytes, flags, into=True, buffer_=buffer)
def _base_recv(self, nbytes, flags, into, buffer_=None):
if into:
plain_socket_function = socket.recv_into
else:
plain_socket_function = socket.recv
# *NOTE: gross, copied code from ssl.py becase it's not factored well enough to be used as-is
if self._sslobj:
if flags != 0:
raise ValueError(
"non-zero flags not allowed in calls to %s() on %s" %
plain_socket_function.__name__, self.__class__)
if into:
read = self.read(nbytes, buffer_)
else:
read = self.read(nbytes)
return read
else:
while True:
try:
args = [self, nbytes, flags]
if into:
args.insert(1, buffer_)
return plain_socket_function(*args)
except orig_socket.error as e:
if self.act_non_blocking:
raise
erno = get_errno(e)
if erno in greenio.SOCKET_BLOCKING:
try:
trampoline(
self, read=True,
timeout=self.gettimeout(), timeout_exc=timeout_exc('timed out'))
except IOClosed:
return b''
elif erno in greenio.SOCKET_CLOSED:
return b''
raise
def recvfrom(self, addr, buflen=1024, flags=0):
if not self.act_non_blocking:
trampoline(self, read=True, timeout=self.gettimeout(),
timeout_exc=timeout_exc('timed out'))
return super(GreenSSLSocket, self).recvfrom(addr, buflen, flags)
def recvfrom_into(self, buffer, nbytes=None, flags=0):
if not self.act_non_blocking:
trampoline(self, read=True, timeout=self.gettimeout(),
timeout_exc=timeout_exc('timed out'))
return super(GreenSSLSocket, self).recvfrom_into(buffer, nbytes, flags)
def unwrap(self):
return GreenSocket(self._call_trampolining(
super(GreenSSLSocket, self).unwrap))
def do_handshake(self):
"""Perform a TLS/SSL handshake."""
return self._call_trampolining(
super(GreenSSLSocket, self).do_handshake)
def _socket_connect(self, addr):
real_connect = socket.connect
if self.act_non_blocking:
return real_connect(self, addr)
else:
clock = hubs.get_hub().clock
# *NOTE: gross, copied code from greenio because it's not factored
# well enough to reuse
if self.gettimeout() is None:
while True:
try:
return real_connect(self, addr)
except orig_socket.error as exc:
if get_errno(exc) in CONNECT_ERR:
trampoline(self, write=True)
elif get_errno(exc) in CONNECT_SUCCESS:
return
else:
raise
else:
end = clock() + self.gettimeout()
while True:
try:
real_connect(self, addr)
except orig_socket.error as exc:
if get_errno(exc) in CONNECT_ERR:
trampoline(
self, write=True,
timeout=end - clock(), timeout_exc=timeout_exc('timed out'))
elif get_errno(exc) in CONNECT_SUCCESS:
return
else:
raise
if clock() >= end:
raise timeout_exc('timed out')
def connect(self, addr):
"""Connects to remote ADDR, and then wraps the connection in
an SSL channel."""
# *NOTE: grrrrr copied this code from ssl.py because of the reference
# to socket.connect which we don't want to call directly
if self._sslobj:
raise ValueError("attempt to connect already-connected SSLSocket!")
self._socket_connect(addr)
server_side = False
try:
sslwrap = _ssl.sslwrap
except AttributeError:
# sslwrap was removed in 3.x and later in 2.7.9
if six.PY2:
sslobj = self._context._wrap_socket(self._sock, server_side, ssl_sock=self)
else:
context = self.context if PY33 else self._context
sslobj = context._wrap_socket(self, server_side, server_hostname=self.server_hostname)
else:
sslobj = sslwrap(self._sock, server_side, self.keyfile, self.certfile,
self.cert_reqs, self.ssl_version,
self.ca_certs, *self.ciphers)
try:
# This is added in Python 3.5, http://bugs.python.org/issue21965
SSLObject
except NameError:
self._sslobj = sslobj
else:
if _is_under_py_3_7:
self._sslobj = SSLObject(sslobj, owner=self)
else:
self._sslobj = sslobj
if self.do_handshake_on_connect:
self.do_handshake()
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."""
# RDW grr duplication of code from greenio
if self.act_non_blocking:
newsock, addr = socket.accept(self)
else:
while True:
try:
newsock, addr = socket.accept(self)
break
except orig_socket.error as e:
if get_errno(e) not in greenio.SOCKET_BLOCKING:
raise
trampoline(self, read=True, timeout=self.gettimeout(),
timeout_exc=timeout_exc('timed out'))
new_ssl = type(self)(
newsock,
server_side=True,
do_handshake_on_connect=False,
suppress_ragged_eofs=self.suppress_ragged_eofs,
_context=self._context,
)
return (new_ssl, addr)
def dup(self):
raise NotImplementedError("Can't dup an ssl object")
SSLSocket = GreenSSLSocket
def wrap_socket(sock, *a, **kw):
return GreenSSLSocket(sock, *a, **kw)
if hasattr(__ssl, 'sslwrap_simple'):
def sslwrap_simple(sock, keyfile=None, certfile=None):
"""A replacement for the old socket.ssl function. Designed
for compatibility with Python 2.5 and earlier. Will disappear in
Python 3.0."""
ssl_sock = GreenSSLSocket(sock, keyfile=keyfile, certfile=certfile,
server_side=False,
cert_reqs=CERT_NONE,
ssl_version=PROTOCOL_SSLv23,
ca_certs=None)
return ssl_sock
class GreenSSLContext(_original_sslcontext):
__slots__ = ()
def wrap_socket(self, sock, *a, **kw):
return GreenSSLSocket(sock, *a, _context=self, **kw)
# https://github.com/eventlet/eventlet/issues/371
# Thanks to Gevent developers for sharing patch to this problem.
if hasattr(_original_sslcontext.options, 'setter'):
# In 3.6, these became properties. They want to access the
# property __set__ method in the superclass, and they do so by using
# super(SSLContext, SSLContext). But we rebind SSLContext when we monkey
# patch, which causes infinite recursion.
# https://github.com/python/cpython/commit/328067c468f82e4ec1b5c510a4e84509e010f296
@_original_sslcontext.options.setter
def options(self, value):
super(_original_sslcontext, _original_sslcontext).options.__set__(self, value)
@_original_sslcontext.verify_flags.setter
def verify_flags(self, value):
super(_original_sslcontext, _original_sslcontext).verify_flags.__set__(self, value)
@_original_sslcontext.verify_mode.setter
def verify_mode(self, value):
super(_original_sslcontext, _original_sslcontext).verify_mode.__set__(self, value)
if hasattr(_original_sslcontext, "maximum_version"):
@_original_sslcontext.maximum_version.setter
def maximum_version(self, value):
super(_original_sslcontext, _original_sslcontext).maximum_version.__set__(self, value)
if hasattr(_original_sslcontext, "minimum_version"):
@_original_sslcontext.minimum_version.setter
def minimum_version(self, value):
super(_original_sslcontext, _original_sslcontext).minimum_version.__set__(self, value)
SSLContext = GreenSSLContext
# TODO: ssl.create_default_context() was added in 2.7.9.
# Not clear we're still trying to support Python versions even older than that.
if hasattr(__ssl, 'create_default_context'):
_original_create_default_context = __ssl.create_default_context
def green_create_default_context(*a, **kw):
# We can't just monkey-patch on the green version of `wrap_socket`
# on to SSLContext instances, but SSLContext.create_default_context
# does a bunch of work. Rather than re-implementing it all, just
# switch out the __class__ to get our `wrap_socket` implementation
context = _original_create_default_context(*a, **kw)
context.__class__ = GreenSSLContext
return context
create_default_context = green_create_default_context
_create_default_https_context = green_create_default_context