678 lines
25 KiB
Python
678 lines
25 KiB
Python
import collections
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import warnings
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try:
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import ssl
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except ImportError: # pragma: no cover
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ssl = None
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from . import compat
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from . import protocols
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from . import transports
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from .log import logger
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def _create_transport_context(server_side, server_hostname):
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if server_side:
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raise ValueError('Server side SSL needs a valid SSLContext')
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# Client side may pass ssl=True to use a default
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# context; in that case the sslcontext passed is None.
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# The default is secure for client connections.
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if hasattr(ssl, 'create_default_context'):
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# Python 3.4+: use up-to-date strong settings.
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sslcontext = ssl.create_default_context()
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if not server_hostname:
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sslcontext.check_hostname = False
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else:
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# Fallback for Python 3.3.
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sslcontext = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
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sslcontext.options |= ssl.OP_NO_SSLv2
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sslcontext.options |= ssl.OP_NO_SSLv3
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sslcontext.set_default_verify_paths()
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sslcontext.verify_mode = ssl.CERT_REQUIRED
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return sslcontext
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def _is_sslproto_available():
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return hasattr(ssl, "MemoryBIO")
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# States of an _SSLPipe.
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_UNWRAPPED = "UNWRAPPED"
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_DO_HANDSHAKE = "DO_HANDSHAKE"
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_WRAPPED = "WRAPPED"
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_SHUTDOWN = "SHUTDOWN"
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class _SSLPipe(object):
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"""An SSL "Pipe".
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An SSL pipe allows you to communicate with an SSL/TLS protocol instance
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through memory buffers. It can be used to implement a security layer for an
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existing connection where you don't have access to the connection's file
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descriptor, or for some reason you don't want to use it.
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An SSL pipe can be in "wrapped" and "unwrapped" mode. In unwrapped mode,
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data is passed through untransformed. In wrapped mode, application level
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data is encrypted to SSL record level data and vice versa. The SSL record
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level is the lowest level in the SSL protocol suite and is what travels
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as-is over the wire.
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An SslPipe initially is in "unwrapped" mode. To start SSL, call
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do_handshake(). To shutdown SSL again, call unwrap().
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"""
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max_size = 256 * 1024 # Buffer size passed to read()
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def __init__(self, context, server_side, server_hostname=None):
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"""
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The *context* argument specifies the ssl.SSLContext to use.
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The *server_side* argument indicates whether this is a server side or
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client side transport.
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The optional *server_hostname* argument can be used to specify the
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hostname you are connecting to. You may only specify this parameter if
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the _ssl module supports Server Name Indication (SNI).
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"""
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self._context = context
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self._server_side = server_side
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self._server_hostname = server_hostname
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self._state = _UNWRAPPED
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self._incoming = ssl.MemoryBIO()
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self._outgoing = ssl.MemoryBIO()
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self._sslobj = None
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self._need_ssldata = False
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self._handshake_cb = None
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self._shutdown_cb = None
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@property
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def context(self):
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"""The SSL context passed to the constructor."""
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return self._context
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@property
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def ssl_object(self):
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"""The internal ssl.SSLObject instance.
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Return None if the pipe is not wrapped.
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"""
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return self._sslobj
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@property
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def need_ssldata(self):
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"""Whether more record level data is needed to complete a handshake
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that is currently in progress."""
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return self._need_ssldata
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@property
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def wrapped(self):
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"""
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Whether a security layer is currently in effect.
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Return False during handshake.
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"""
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return self._state == _WRAPPED
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def do_handshake(self, callback=None):
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"""Start the SSL handshake.
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Return a list of ssldata. A ssldata element is a list of buffers
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The optional *callback* argument can be used to install a callback that
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will be called when the handshake is complete. The callback will be
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called with None if successful, else an exception instance.
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"""
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if self._state != _UNWRAPPED:
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raise RuntimeError('handshake in progress or completed')
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self._sslobj = self._context.wrap_bio(
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self._incoming, self._outgoing,
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server_side=self._server_side,
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server_hostname=self._server_hostname)
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self._state = _DO_HANDSHAKE
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self._handshake_cb = callback
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ssldata, appdata = self.feed_ssldata(b'', only_handshake=True)
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assert len(appdata) == 0
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return ssldata
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def shutdown(self, callback=None):
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"""Start the SSL shutdown sequence.
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Return a list of ssldata. A ssldata element is a list of buffers
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The optional *callback* argument can be used to install a callback that
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will be called when the shutdown is complete. The callback will be
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called without arguments.
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"""
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if self._state == _UNWRAPPED:
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raise RuntimeError('no security layer present')
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if self._state == _SHUTDOWN:
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raise RuntimeError('shutdown in progress')
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assert self._state in (_WRAPPED, _DO_HANDSHAKE)
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self._state = _SHUTDOWN
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self._shutdown_cb = callback
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ssldata, appdata = self.feed_ssldata(b'')
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assert appdata == [] or appdata == [b'']
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return ssldata
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def feed_eof(self):
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"""Send a potentially "ragged" EOF.
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This method will raise an SSL_ERROR_EOF exception if the EOF is
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unexpected.
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"""
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self._incoming.write_eof()
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ssldata, appdata = self.feed_ssldata(b'')
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assert appdata == [] or appdata == [b'']
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def feed_ssldata(self, data, only_handshake=False):
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"""Feed SSL record level data into the pipe.
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The data must be a bytes instance. It is OK to send an empty bytes
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instance. This can be used to get ssldata for a handshake initiated by
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this endpoint.
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Return a (ssldata, appdata) tuple. The ssldata element is a list of
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buffers containing SSL data that needs to be sent to the remote SSL.
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The appdata element is a list of buffers containing plaintext data that
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needs to be forwarded to the application. The appdata list may contain
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an empty buffer indicating an SSL "close_notify" alert. This alert must
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be acknowledged by calling shutdown().
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"""
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if self._state == _UNWRAPPED:
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# If unwrapped, pass plaintext data straight through.
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if data:
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appdata = [data]
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else:
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appdata = []
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return ([], appdata)
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self._need_ssldata = False
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if data:
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self._incoming.write(data)
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ssldata = []
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appdata = []
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try:
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if self._state == _DO_HANDSHAKE:
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# Call do_handshake() until it doesn't raise anymore.
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self._sslobj.do_handshake()
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self._state = _WRAPPED
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if self._handshake_cb:
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self._handshake_cb(None)
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if only_handshake:
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return (ssldata, appdata)
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# Handshake done: execute the wrapped block
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if self._state == _WRAPPED:
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# Main state: read data from SSL until close_notify
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while True:
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chunk = self._sslobj.read(self.max_size)
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appdata.append(chunk)
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if not chunk: # close_notify
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break
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elif self._state == _SHUTDOWN:
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# Call shutdown() until it doesn't raise anymore.
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self._sslobj.unwrap()
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self._sslobj = None
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self._state = _UNWRAPPED
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if self._shutdown_cb:
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self._shutdown_cb()
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elif self._state == _UNWRAPPED:
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# Drain possible plaintext data after close_notify.
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appdata.append(self._incoming.read())
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except (ssl.SSLError, ssl.CertificateError) as exc:
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if getattr(exc, 'errno', None) not in (
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ssl.SSL_ERROR_WANT_READ, ssl.SSL_ERROR_WANT_WRITE,
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ssl.SSL_ERROR_SYSCALL):
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if self._state == _DO_HANDSHAKE and self._handshake_cb:
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self._handshake_cb(exc)
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raise
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self._need_ssldata = (exc.errno == ssl.SSL_ERROR_WANT_READ)
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# Check for record level data that needs to be sent back.
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# Happens for the initial handshake and renegotiations.
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if self._outgoing.pending:
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ssldata.append(self._outgoing.read())
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return (ssldata, appdata)
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def feed_appdata(self, data, offset=0):
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"""Feed plaintext data into the pipe.
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Return an (ssldata, offset) tuple. The ssldata element is a list of
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buffers containing record level data that needs to be sent to the
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remote SSL instance. The offset is the number of plaintext bytes that
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were processed, which may be less than the length of data.
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NOTE: In case of short writes, this call MUST be retried with the SAME
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buffer passed into the *data* argument (i.e. the id() must be the
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same). This is an OpenSSL requirement. A further particularity is that
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a short write will always have offset == 0, because the _ssl module
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does not enable partial writes. And even though the offset is zero,
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there will still be encrypted data in ssldata.
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"""
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assert 0 <= offset <= len(data)
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if self._state == _UNWRAPPED:
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# pass through data in unwrapped mode
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if offset < len(data):
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ssldata = [data[offset:]]
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else:
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ssldata = []
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return (ssldata, len(data))
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ssldata = []
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view = memoryview(data)
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while True:
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self._need_ssldata = False
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try:
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if offset < len(view):
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offset += self._sslobj.write(view[offset:])
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except ssl.SSLError as exc:
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# It is not allowed to call write() after unwrap() until the
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# close_notify is acknowledged. We return the condition to the
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# caller as a short write.
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if exc.reason == 'PROTOCOL_IS_SHUTDOWN':
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exc.errno = ssl.SSL_ERROR_WANT_READ
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if exc.errno not in (ssl.SSL_ERROR_WANT_READ,
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ssl.SSL_ERROR_WANT_WRITE,
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ssl.SSL_ERROR_SYSCALL):
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raise
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self._need_ssldata = (exc.errno == ssl.SSL_ERROR_WANT_READ)
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# See if there's any record level data back for us.
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if self._outgoing.pending:
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ssldata.append(self._outgoing.read())
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if offset == len(view) or self._need_ssldata:
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break
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return (ssldata, offset)
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class _SSLProtocolTransport(transports._FlowControlMixin,
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transports.Transport):
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def __init__(self, loop, ssl_protocol, app_protocol):
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self._loop = loop
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# SSLProtocol instance
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self._ssl_protocol = ssl_protocol
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self._app_protocol = app_protocol
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self._closed = False
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def get_extra_info(self, name, default=None):
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"""Get optional transport information."""
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return self._ssl_protocol._get_extra_info(name, default)
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def close(self):
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"""Close the transport.
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Buffered data will be flushed asynchronously. No more data
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will be received. After all buffered data is flushed, the
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protocol's connection_lost() method will (eventually) called
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with None as its argument.
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"""
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self._closed = True
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self._ssl_protocol._start_shutdown()
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# On Python 3.3 and older, objects with a destructor part of a reference
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# cycle are never destroyed. It's not more the case on Python 3.4 thanks
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# to the PEP 442.
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if compat.PY34:
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def __del__(self):
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if not self._closed:
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warnings.warn("unclosed transport %r" % self, ResourceWarning)
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self.close()
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def pause_reading(self):
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"""Pause the receiving end.
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No data will be passed to the protocol's data_received()
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method until resume_reading() is called.
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"""
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self._ssl_protocol._transport.pause_reading()
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def resume_reading(self):
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"""Resume the receiving end.
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Data received will once again be passed to the protocol's
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data_received() method.
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"""
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self._ssl_protocol._transport.resume_reading()
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def set_write_buffer_limits(self, high=None, low=None):
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"""Set the high- and low-water limits for write flow control.
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These two values control when to call the protocol's
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pause_writing() and resume_writing() methods. If specified,
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the low-water limit must be less than or equal to the
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high-water limit. Neither value can be negative.
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The defaults are implementation-specific. If only the
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high-water limit is given, the low-water limit defaults to an
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implementation-specific value less than or equal to the
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high-water limit. Setting high to zero forces low to zero as
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well, and causes pause_writing() to be called whenever the
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buffer becomes non-empty. Setting low to zero causes
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resume_writing() to be called only once the buffer is empty.
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Use of zero for either limit is generally sub-optimal as it
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reduces opportunities for doing I/O and computation
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concurrently.
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"""
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self._ssl_protocol._transport.set_write_buffer_limits(high, low)
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def get_write_buffer_size(self):
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"""Return the current size of the write buffer."""
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return self._ssl_protocol._transport.get_write_buffer_size()
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def write(self, data):
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"""Write some data bytes to the transport.
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This does not block; it buffers the data and arranges for it
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to be sent out asynchronously.
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"""
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if not isinstance(data, (bytes, bytearray, memoryview)):
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raise TypeError("data: expecting a bytes-like instance, got {!r}"
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.format(type(data).__name__))
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if not data:
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return
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self._ssl_protocol._write_appdata(data)
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def can_write_eof(self):
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"""Return True if this transport supports write_eof(), False if not."""
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return False
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def abort(self):
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"""Close the transport immediately.
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Buffered data will be lost. No more data will be received.
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The protocol's connection_lost() method will (eventually) be
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called with None as its argument.
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"""
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self._ssl_protocol._abort()
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class SSLProtocol(protocols.Protocol):
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"""SSL protocol.
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Implementation of SSL on top of a socket using incoming and outgoing
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buffers which are ssl.MemoryBIO objects.
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"""
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def __init__(self, loop, app_protocol, sslcontext, waiter,
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server_side=False, server_hostname=None):
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if ssl is None:
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raise RuntimeError('stdlib ssl module not available')
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if not sslcontext:
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sslcontext = _create_transport_context(server_side, server_hostname)
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self._server_side = server_side
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if server_hostname and not server_side:
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self._server_hostname = server_hostname
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else:
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self._server_hostname = None
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self._sslcontext = sslcontext
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# SSL-specific extra info. More info are set when the handshake
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# completes.
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self._extra = dict(sslcontext=sslcontext)
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# App data write buffering
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self._write_backlog = collections.deque()
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self._write_buffer_size = 0
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self._waiter = waiter
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self._loop = loop
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self._app_protocol = app_protocol
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self._app_transport = _SSLProtocolTransport(self._loop,
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self, self._app_protocol)
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# _SSLPipe instance (None until the connection is made)
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self._sslpipe = None
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self._session_established = False
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self._in_handshake = False
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self._in_shutdown = False
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# transport, ex: SelectorSocketTransport
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self._transport = None
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def _wakeup_waiter(self, exc=None):
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if self._waiter is None:
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return
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if not self._waiter.cancelled():
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if exc is not None:
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self._waiter.set_exception(exc)
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else:
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self._waiter.set_result(None)
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self._waiter = None
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def connection_made(self, transport):
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"""Called when the low-level connection is made.
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Start the SSL handshake.
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"""
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self._transport = transport
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self._sslpipe = _SSLPipe(self._sslcontext,
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self._server_side,
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self._server_hostname)
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self._start_handshake()
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def connection_lost(self, exc):
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"""Called when the low-level connection is lost or closed.
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The argument is an exception object or None (the latter
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meaning a regular EOF is received or the connection was
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aborted or closed).
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"""
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if self._session_established:
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self._session_established = False
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self._loop.call_soon(self._app_protocol.connection_lost, exc)
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self._transport = None
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self._app_transport = None
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def pause_writing(self):
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"""Called when the low-level transport's buffer goes over
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the high-water mark.
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"""
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self._app_protocol.pause_writing()
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def resume_writing(self):
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"""Called when the low-level transport's buffer drains below
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the low-water mark.
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"""
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self._app_protocol.resume_writing()
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def data_received(self, data):
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"""Called when some SSL data is received.
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The argument is a bytes object.
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"""
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try:
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ssldata, appdata = self._sslpipe.feed_ssldata(data)
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except ssl.SSLError as e:
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if self._loop.get_debug():
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logger.warning('%r: SSL error %s (reason %s)',
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self, e.errno, e.reason)
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self._abort()
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return
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for chunk in ssldata:
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self._transport.write(chunk)
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for chunk in appdata:
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if chunk:
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self._app_protocol.data_received(chunk)
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else:
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self._start_shutdown()
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break
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def eof_received(self):
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"""Called when the other end of the low-level stream
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is half-closed.
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If this returns a false value (including None), the transport
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will close itself. If it returns a true value, closing the
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transport is up to the protocol.
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"""
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try:
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if self._loop.get_debug():
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logger.debug("%r received EOF", self)
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self._wakeup_waiter(ConnectionResetError)
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if not self._in_handshake:
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keep_open = self._app_protocol.eof_received()
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if keep_open:
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logger.warning('returning true from eof_received() '
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'has no effect when using ssl')
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finally:
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self._transport.close()
|
|
|
|
def _get_extra_info(self, name, default=None):
|
|
if name in self._extra:
|
|
return self._extra[name]
|
|
else:
|
|
return self._transport.get_extra_info(name, default)
|
|
|
|
def _start_shutdown(self):
|
|
if self._in_shutdown:
|
|
return
|
|
self._in_shutdown = True
|
|
self._write_appdata(b'')
|
|
|
|
def _write_appdata(self, data):
|
|
self._write_backlog.append((data, 0))
|
|
self._write_buffer_size += len(data)
|
|
self._process_write_backlog()
|
|
|
|
def _start_handshake(self):
|
|
if self._loop.get_debug():
|
|
logger.debug("%r starts SSL handshake", self)
|
|
self._handshake_start_time = self._loop.time()
|
|
else:
|
|
self._handshake_start_time = None
|
|
self._in_handshake = True
|
|
# (b'', 1) is a special value in _process_write_backlog() to do
|
|
# the SSL handshake
|
|
self._write_backlog.append((b'', 1))
|
|
self._loop.call_soon(self._process_write_backlog)
|
|
|
|
def _on_handshake_complete(self, handshake_exc):
|
|
self._in_handshake = False
|
|
|
|
sslobj = self._sslpipe.ssl_object
|
|
try:
|
|
if handshake_exc is not None:
|
|
raise handshake_exc
|
|
|
|
peercert = sslobj.getpeercert()
|
|
if not hasattr(self._sslcontext, 'check_hostname'):
|
|
# Verify hostname if requested, Python 3.4+ uses check_hostname
|
|
# and checks the hostname in do_handshake()
|
|
if (self._server_hostname
|
|
and self._sslcontext.verify_mode != ssl.CERT_NONE):
|
|
ssl.match_hostname(peercert, self._server_hostname)
|
|
except BaseException as exc:
|
|
if self._loop.get_debug():
|
|
if isinstance(exc, ssl.CertificateError):
|
|
logger.warning("%r: SSL handshake failed "
|
|
"on verifying the certificate",
|
|
self, exc_info=True)
|
|
else:
|
|
logger.warning("%r: SSL handshake failed",
|
|
self, exc_info=True)
|
|
self._transport.close()
|
|
if isinstance(exc, Exception):
|
|
self._wakeup_waiter(exc)
|
|
return
|
|
else:
|
|
raise
|
|
|
|
if self._loop.get_debug():
|
|
dt = self._loop.time() - self._handshake_start_time
|
|
logger.debug("%r: SSL handshake took %.1f ms", self, dt * 1e3)
|
|
|
|
# Add extra info that becomes available after handshake.
|
|
self._extra.update(peercert=peercert,
|
|
cipher=sslobj.cipher(),
|
|
compression=sslobj.compression(),
|
|
ssl_object=sslobj,
|
|
)
|
|
self._app_protocol.connection_made(self._app_transport)
|
|
self._wakeup_waiter()
|
|
self._session_established = True
|
|
# In case transport.write() was already called. Don't call
|
|
# immediatly _process_write_backlog(), but schedule it:
|
|
# _on_handshake_complete() can be called indirectly from
|
|
# _process_write_backlog(), and _process_write_backlog() is not
|
|
# reentrant.
|
|
self._loop.call_soon(self._process_write_backlog)
|
|
|
|
def _process_write_backlog(self):
|
|
# Try to make progress on the write backlog.
|
|
if self._transport is None:
|
|
return
|
|
|
|
try:
|
|
for i in range(len(self._write_backlog)):
|
|
data, offset = self._write_backlog[0]
|
|
if data:
|
|
ssldata, offset = self._sslpipe.feed_appdata(data, offset)
|
|
elif offset:
|
|
ssldata = self._sslpipe.do_handshake(
|
|
self._on_handshake_complete)
|
|
offset = 1
|
|
else:
|
|
ssldata = self._sslpipe.shutdown(self._finalize)
|
|
offset = 1
|
|
|
|
for chunk in ssldata:
|
|
self._transport.write(chunk)
|
|
|
|
if offset < len(data):
|
|
self._write_backlog[0] = (data, offset)
|
|
# A short write means that a write is blocked on a read
|
|
# We need to enable reading if it is paused!
|
|
assert self._sslpipe.need_ssldata
|
|
if self._transport._paused:
|
|
self._transport.resume_reading()
|
|
break
|
|
|
|
# An entire chunk from the backlog was processed. We can
|
|
# delete it and reduce the outstanding buffer size.
|
|
del self._write_backlog[0]
|
|
self._write_buffer_size -= len(data)
|
|
except BaseException as exc:
|
|
if self._in_handshake:
|
|
# BaseExceptions will be re-raised in _on_handshake_complete.
|
|
self._on_handshake_complete(exc)
|
|
else:
|
|
self._fatal_error(exc, 'Fatal error on SSL transport')
|
|
if not isinstance(exc, Exception):
|
|
# BaseException
|
|
raise
|
|
|
|
def _fatal_error(self, exc, message='Fatal error on transport'):
|
|
# Should be called from exception handler only.
|
|
if isinstance(exc, (BrokenPipeError, ConnectionResetError)):
|
|
if self._loop.get_debug():
|
|
logger.debug("%r: %s", self, message, exc_info=True)
|
|
else:
|
|
self._loop.call_exception_handler({
|
|
'message': message,
|
|
'exception': exc,
|
|
'transport': self._transport,
|
|
'protocol': self,
|
|
})
|
|
if self._transport:
|
|
self._transport._force_close(exc)
|
|
|
|
def _finalize(self):
|
|
if self._transport is not None:
|
|
self._transport.close()
|
|
|
|
def _abort(self):
|
|
if self._transport is not None:
|
|
try:
|
|
self._transport.abort()
|
|
finally:
|
|
self._finalize()
|