track embedded python distribution

1 files changed, 436 insertions, 0 deletions

diff --git a/python/gevent/_ssl2.py b/python/gevent/_ssl2.py
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+++ b/python/gevent/_ssl2.py
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+# Wrapper module for _ssl. Written by Bill Janssen.
+# Ported to gevent by Denis Bilenko.
+"""SSL wrapper for socket objects on Python 2.7.8 and below.
+
+For the documentation, refer to :mod:`ssl` module manual.
+
+This module implements cooperative SSL socket wrappers.
+"""
+
+from __future__ import absolute_import
+# Our import magic sadly makes this warning useless
+# pylint: disable=undefined-variable,arguments-differ,no-member
+
+import ssl as __ssl__
+
+_ssl = __ssl__._ssl
+
+import sys
+import errno
+from gevent._socket2 import socket
+from gevent.socket import _fileobject, timeout_default
+from gevent.socket import error as socket_error, EWOULDBLOCK
+from gevent.socket import timeout as _socket_timeout
+from gevent._compat import PYPY
+from gevent._util import copy_globals
+
+
+__implements__ = ['SSLSocket',
+                  'wrap_socket',
+                  'get_server_certificate',
+                  'sslwrap_simple']
+
+# Import all symbols from Python's ssl.py, except those that we are implementing
+# and "private" symbols.
+__imports__ = copy_globals(__ssl__, globals(),
+                           # SSLSocket *must* subclass gevent.socket.socket; see issue 597
+                           names_to_ignore=__implements__ + ['socket'],
+                           dunder_names_to_keep=())
+
+
+# Py2.6 can get RAND_status added twice
+__all__ = list(set(__implements__) | set(__imports__))
+if 'namedtuple' in __all__:
+    __all__.remove('namedtuple')
+
+class SSLSocket(socket):
+    """
+    gevent `ssl.SSLSocket <https://docs.python.org/2.6/library/ssl.html#sslsocket-objects>`_
+    for Pythons < 2.7.9.
+    """
+
+    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,
+                 suppress_ragged_eofs=True,
+                 ciphers=None):
+        socket.__init__(self, _sock=sock)
+
+        if PYPY:
+            sock._drop()
+
+        if certfile and not keyfile:
+            keyfile = certfile
+        # see if it's connected
+        try:
+            socket.getpeername(self)
+        except socket_error as e:
+            if e.args[0] != errno.ENOTCONN:
+                raise
+            # no, no connection yet
+            self._sslobj = None
+        else:
+            # yes, create the SSL object
+            if ciphers is None:
+                self._sslobj = _ssl.sslwrap(self._sock, server_side,
+                                            keyfile, certfile,
+                                            cert_reqs, ssl_version, ca_certs)
+            else:
+                self._sslobj = _ssl.sslwrap(self._sock, server_side,
+                                            keyfile, certfile,
+                                            cert_reqs, ssl_version, ca_certs,
+                                            ciphers)
+            if do_handshake_on_connect:
+                self.do_handshake()
+        self.keyfile = keyfile
+        self.certfile = certfile
+        self.cert_reqs = cert_reqs
+        self.ssl_version = ssl_version
+        self.ca_certs = ca_certs
+        self.ciphers = ciphers
+        self.do_handshake_on_connect = do_handshake_on_connect
+        self.suppress_ragged_eofs = suppress_ragged_eofs
+        self._makefile_refs = 0
+
+    def read(self, len=1024):
+        """Read up to LEN bytes and return them.
+        Return zero-length string on EOF."""
+        while True:
+            try:
+                return self._sslobj.read(len)
+            except SSLError as ex:
+                if ex.args[0] == SSL_ERROR_EOF and self.suppress_ragged_eofs:
+                    return ''
+                elif ex.args[0] == SSL_ERROR_WANT_READ:
+                    if self.timeout == 0.0:
+                        raise
+                    sys.exc_clear()
+                    self._wait(self._read_event, timeout_exc=_SSLErrorReadTimeout)
+                elif ex.args[0] == SSL_ERROR_WANT_WRITE:
+                    if self.timeout == 0.0:
+                        raise
+                    sys.exc_clear()
+                    # note: using _SSLErrorReadTimeout rather than _SSLErrorWriteTimeout below is intentional
+                    self._wait(self._write_event, timeout_exc=_SSLErrorReadTimeout)
+                else:
+                    raise
+
+    def write(self, data):
+        """Write DATA to the underlying SSL channel.  Returns
+        number of bytes of DATA actually transmitted."""
+        while True:
+            try:
+                return self._sslobj.write(data)
+            except SSLError as ex:
+                if ex.args[0] == SSL_ERROR_WANT_READ:
+                    if self.timeout == 0.0:
+                        raise
+                    sys.exc_clear()
+                    self._wait(self._read_event, timeout_exc=_SSLErrorWriteTimeout)
+                elif ex.args[0] == SSL_ERROR_WANT_WRITE:
+                    if self.timeout == 0.0:
+                        raise
+                    sys.exc_clear()
+                    self._wait(self._write_event, timeout_exc=_SSLErrorWriteTimeout)
+                else:
+                    raise
+
+    def getpeercert(self, binary_form=False):
+        """Returns a formatted version of the data in the
+        certificate provided by the other end of the SSL channel.
+        Return None if no certificate was provided, {} if a
+        certificate was provided, but not validated."""
+        return self._sslobj.peer_certificate(binary_form)
+
+    def cipher(self):
+        if not self._sslobj:
+            return None
+        return self._sslobj.cipher()
+
+    def send(self, data, flags=0, timeout=timeout_default):
+        if timeout is timeout_default:
+            timeout = self.timeout
+        if self._sslobj:
+            if flags != 0:
+                raise ValueError(
+                    "non-zero flags not allowed in calls to send() on %s" %
+                    self.__class__)
+            while True:
+                try:
+                    v = self._sslobj.write(data)
+                except SSLError as x:
+                    if x.args[0] == SSL_ERROR_WANT_READ:
+                        if self.timeout == 0.0:
+                            return 0
+                        sys.exc_clear()
+                        self._wait(self._read_event)
+                    elif x.args[0] == SSL_ERROR_WANT_WRITE:
+                        if self.timeout == 0.0:
+                            return 0
+                        sys.exc_clear()
+                        self._wait(self._write_event)
+                    else:
+                        raise
+                else:
+                    return v
+        else:
+            return socket.send(self, data, flags, timeout)
+    # is it possible for sendall() to send some data without encryption if another end shut down SSL?
+
+    def sendall(self, data, flags=0):
+        try:
+            socket.sendall(self, data)
+        except _socket_timeout as ex:
+            if self.timeout == 0.0:
+                # Python 2 simply *hangs* in this case, which is bad, but
+                # Python 3 raises SSLWantWriteError. We do the same.
+                raise SSLError(SSL_ERROR_WANT_WRITE)
+            # Convert the socket.timeout back to the sslerror
+            raise SSLError(*ex.args)
+
+    def sendto(self, *args):
+        if self._sslobj:
+            raise ValueError("sendto not allowed on instances of %s" %
+                             self.__class__)
+        else:
+            return socket.sendto(self, *args)
+
+    def recv(self, buflen=1024, flags=0):
+        if self._sslobj:
+            if flags != 0:
+                raise ValueError(
+                    "non-zero flags not allowed in calls to recv() on %s" %
+                    self.__class__)
+            # QQQ Shouldn't we wrap the SSL_WANT_READ errors as socket.timeout errors to match socket.recv's behavior?
+            return self.read(buflen)
+        else:
+            return socket.recv(self, buflen, flags)
+
+    def recv_into(self, buffer, nbytes=None, flags=0):
+        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__)
+            while True:
+                try:
+                    tmp_buffer = self.read(nbytes)
+                    v = len(tmp_buffer)
+                    buffer[:v] = tmp_buffer
+                    return v
+                except SSLError as x:
+                    if x.args[0] == SSL_ERROR_WANT_READ:
+                        if self.timeout == 0.0:
+                            raise
+                        sys.exc_clear()
+                        self._wait(self._read_event)
+                        continue
+                    else:
+                        raise
+        else:
+            return socket.recv_into(self, buffer, nbytes, flags)
+
+    def recvfrom(self, *args):
+        if self._sslobj:
+            raise ValueError("recvfrom not allowed on instances of %s" %
+                             self.__class__)
+        else:
+            return socket.recvfrom(self, *args)
+
+    def recvfrom_into(self, *args):
+        if self._sslobj:
+            raise ValueError("recvfrom_into not allowed on instances of %s" %
+                             self.__class__)
+        else:
+            return socket.recvfrom_into(self, *args)
+
+    def pending(self):
+        if self._sslobj:
+            return self._sslobj.pending()
+        return 0
+
+    def _sslobj_shutdown(self):
+        while True:
+            try:
+                return self._sslobj.shutdown()
+            except SSLError as ex:
+                if ex.args[0] == SSL_ERROR_EOF and self.suppress_ragged_eofs:
+                    return ''
+                elif ex.args[0] == SSL_ERROR_WANT_READ:
+                    if self.timeout == 0.0:
+                        raise
+                    sys.exc_clear()
+                    self._wait(self._read_event, timeout_exc=_SSLErrorReadTimeout)
+                elif ex.args[0] == SSL_ERROR_WANT_WRITE:
+                    if self.timeout == 0.0:
+                        raise
+                    sys.exc_clear()
+                    self._wait(self._write_event, timeout_exc=_SSLErrorWriteTimeout)
+                else:
+                    raise
+
+    def unwrap(self):
+        if self._sslobj:
+            s = self._sslobj_shutdown()
+            self._sslobj = None
+            return socket(_sock=s)
+        else:
+            raise ValueError("No SSL wrapper around " + str(self))
+
+    def shutdown(self, how):
+        self._sslobj = None
+        socket.shutdown(self, how)
+
+    def close(self):
+        if self._makefile_refs < 1:
+            self._sslobj = None
+            socket.close(self)
+        else:
+            self._makefile_refs -= 1
+
+    if PYPY:
+
+        def _reuse(self):
+            self._makefile_refs += 1
+
+        def _drop(self):
+            if self._makefile_refs < 1:
+                self.close()
+            else:
+                self._makefile_refs -= 1
+
+    def do_handshake(self):
+        """Perform a TLS/SSL handshake."""
+        while True:
+            try:
+                return self._sslobj.do_handshake()
+            except SSLError as ex:
+                if ex.args[0] == SSL_ERROR_WANT_READ:
+                    if self.timeout == 0.0:
+                        raise
+                    sys.exc_clear()
+                    self._wait(self._read_event, timeout_exc=_SSLErrorHandshakeTimeout)
+                elif ex.args[0] == SSL_ERROR_WANT_WRITE:
+                    if self.timeout == 0.0:
+                        raise
+                    sys.exc_clear()
+                    self._wait(self._write_event, timeout_exc=_SSLErrorHandshakeTimeout)
+                else:
+                    raise
+
+    def connect(self, addr):
+        """Connects to remote ADDR, and then wraps the connection in
+        an SSL channel."""
+        # 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._sslobj:
+            raise ValueError("attempt to connect already-connected SSLSocket!")
+        socket.connect(self, addr)
+        if self.ciphers is None:
+            self._sslobj = _ssl.sslwrap(self._sock, False, self.keyfile, self.certfile,
+                                        self.cert_reqs, self.ssl_version,
+                                        self.ca_certs)
+        else:
+            self._sslobj = _ssl.sslwrap(self._sock, False, self.keyfile, self.certfile,
+                                        self.cert_reqs, self.ssl_version,
+                                        self.ca_certs, self.ciphers)
+        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."""
+        sock = self._sock
+        while True:
+            try:
+                client_socket, address = sock.accept()
+                break
+            except socket_error as ex:
+                if ex.args[0] != EWOULDBLOCK or self.timeout == 0.0:
+                    raise
+                sys.exc_clear()
+            self._wait(self._read_event)
+
+        sslobj = SSLSocket(client_socket,
+                           keyfile=self.keyfile,
+                           certfile=self.certfile,
+                           server_side=True,
+                           cert_reqs=self.cert_reqs,
+                           ssl_version=self.ssl_version,
+                           ca_certs=self.ca_certs,
+                           do_handshake_on_connect=self.do_handshake_on_connect,
+                           suppress_ragged_eofs=self.suppress_ragged_eofs,
+                           ciphers=self.ciphers)
+
+        return sslobj, address
+
+    def makefile(self, mode='r', bufsize=-1):
+        """Make and return a file-like object that
+        works with the SSL connection.  Just use the code
+        from the socket module."""
+        if not PYPY:
+            self._makefile_refs += 1
+        # close=True so as to decrement the reference count when done with
+        # the file-like object.
+        return _fileobject(self, mode, bufsize, close=True)
+
+if PYPY or not hasattr(SSLSocket, 'timeout'):
+    # PyPy (and certain versions of CPython) doesn't have a direct
+    # 'timeout' property on raw sockets, because that's not part of
+    # the documented specification. We may wind up wrapping a raw
+    # socket (when ssl is used with PyWSGI) or a gevent socket, which
+    # does have a read/write timeout property as an alias for
+    # get/settimeout, so make sure that's always the case because
+    # pywsgi can depend on that.
+    SSLSocket.timeout = property(lambda self: self.gettimeout(),
+                                 lambda self, value: self.settimeout(value))
+
+
+_SSLErrorReadTimeout = SSLError('The read operation timed out')
+_SSLErrorWriteTimeout = SSLError('The write operation timed out')
+_SSLErrorHandshakeTimeout = SSLError('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):
+    """Create a new :class:`SSLSocket` instance."""
+    return SSLSocket(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."""
+
+    if ca_certs is not None:
+        cert_reqs = CERT_REQUIRED
+    else:
+        cert_reqs = CERT_NONE
+    s = wrap_socket(socket(), ssl_version=ssl_version,
+                    cert_reqs=cert_reqs, ca_certs=ca_certs)
+    s.connect(addr)
+    dercert = s.getpeercert(True)
+    s.close()
+    return DER_cert_to_PEM_cert(dercert)
+
+
+def sslwrap_simple(sock, keyfile=None, certfile=None):
+    """A replacement for the old socket.ssl function.  Designed
+    for compatability with Python 2.5 and earlier.  Will disappear in
+    Python 3.0."""
+    return SSLSocket(sock, keyfile, certfile)