# gevent

# Source code for gevent._ssl2

    # (No idea where this comes from; it warns about 'configuration')
    # pylint:disable=invalid-all-format
    # 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.

    .. deprecated:: 1.3
       This module is not secure. Support for Python versions
       with only this level of SSL will be dropped in gevent 1.4.
    """

    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 ''
                    if 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__)
            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)
            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
                        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__)
            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__)
            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 ''
                    if 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 not self._sslobj:
                raise ValueError("No SSL wrapper around " + str(self))
            s = self._sslobj_shutdown()
            self._sslobj = None
            return socket(_sock=s)

        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): # renamed addr -> address in Python 3 pylint:disable=arguments-renamed
            """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 compatibility with Python 2.5 and earlier.  Will disappear in
        Python 3.0."""
        return SSLSocket(sock, keyfile, certfile)