# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: ssl.py
"""This module provides some more Pythonic support for SSL.

Object types:

  SSLSocket -- subtype of socket.socket which does SSL over the socket

Exceptions:

  SSLError -- exception raised for I/O errors

Functions:

  cert_time_to_seconds -- convert time string used for certificate
                          notBefore and notAfter functions to integer
                          seconds past the Epoch (the time values
                          returned from time.time())

  fetch_server_certificate (HOST, PORT) -- fetch the certificate provided
                          by the server running on HOST at port PORT.  No
                          validation of the certificate is performed.

Integer constants:

SSL_ERROR_ZERO_RETURN
SSL_ERROR_WANT_READ
SSL_ERROR_WANT_WRITE
SSL_ERROR_WANT_X509_LOOKUP
SSL_ERROR_SYSCALL
SSL_ERROR_SSL
SSL_ERROR_WANT_CONNECT

SSL_ERROR_EOF
SSL_ERROR_INVALID_ERROR_CODE

The following group define certificate requirements that one side is
allowing/requiring from the other side:

CERT_NONE - no certificates from the other side are required (or will
            be looked at if provided)
CERT_OPTIONAL - certificates are not required, but if provided will be
                validated, and if validation fails, the connection will
                also fail
CERT_REQUIRED - certificates are required, and will be validated, and
                if validation fails, the connection will also fail

The following constants identify various SSL protocol variants:

PROTOCOL_SSLv2
PROTOCOL_SSLv3
PROTOCOL_SSLv23
PROTOCOL_TLS
PROTOCOL_TLS_CLIENT
PROTOCOL_TLS_SERVER
PROTOCOL_TLSv1
PROTOCOL_TLSv1_1
PROTOCOL_TLSv1_2

The following constants identify various SSL alert message descriptions as per
http://www.iana.org/assignments/tls-parameters/tls-parameters.xml#tls-parameters-6

ALERT_DESCRIPTION_CLOSE_NOTIFY
ALERT_DESCRIPTION_UNEXPECTED_MESSAGE
ALERT_DESCRIPTION_BAD_RECORD_MAC
ALERT_DESCRIPTION_RECORD_OVERFLOW
ALERT_DESCRIPTION_DECOMPRESSION_FAILURE
ALERT_DESCRIPTION_HANDSHAKE_FAILURE
ALERT_DESCRIPTION_BAD_CERTIFICATE
ALERT_DESCRIPTION_UNSUPPORTED_CERTIFICATE
ALERT_DESCRIPTION_CERTIFICATE_REVOKED
ALERT_DESCRIPTION_CERTIFICATE_EXPIRED
ALERT_DESCRIPTION_CERTIFICATE_UNKNOWN
ALERT_DESCRIPTION_ILLEGAL_PARAMETER
ALERT_DESCRIPTION_UNKNOWN_CA
ALERT_DESCRIPTION_ACCESS_DENIED
ALERT_DESCRIPTION_DECODE_ERROR
ALERT_DESCRIPTION_DECRYPT_ERROR
ALERT_DESCRIPTION_PROTOCOL_VERSION
ALERT_DESCRIPTION_INSUFFICIENT_SECURITY
ALERT_DESCRIPTION_INTERNAL_ERROR
ALERT_DESCRIPTION_USER_CANCELLED
ALERT_DESCRIPTION_NO_RENEGOTIATION
ALERT_DESCRIPTION_UNSUPPORTED_EXTENSION
ALERT_DESCRIPTION_CERTIFICATE_UNOBTAINABLE
ALERT_DESCRIPTION_UNRECOGNIZED_NAME
ALERT_DESCRIPTION_BAD_CERTIFICATE_STATUS_RESPONSE
ALERT_DESCRIPTION_BAD_CERTIFICATE_HASH_VALUE
ALERT_DESCRIPTION_UNKNOWN_PSK_IDENTITY
"""
import ipaddress, textwrap, re, sys, os
from collections import namedtuple
from enum import Enum as _Enum, IntEnum as _IntEnum, IntFlag as _IntFlag
import _ssl
from _ssl import OPENSSL_VERSION_NUMBER, OPENSSL_VERSION_INFO, OPENSSL_VERSION
from _ssl import _SSLContext, MemoryBIO, SSLSession
from _ssl import (
    SSLError,
    SSLZeroReturnError,
    SSLWantReadError,
    SSLWantWriteError,
    SSLSyscallError,
    SSLEOFError,
)
from _ssl import txt2obj as _txt2obj, nid2obj as _nid2obj
from _ssl import RAND_status, RAND_add, RAND_bytes, RAND_pseudo_bytes

try:
    from _ssl import RAND_egd
except ImportError:
    pass

from _ssl import HAS_SNI, HAS_ECDH, HAS_NPN, HAS_ALPN, HAS_TLSv1_3
from _ssl import _OPENSSL_API_VERSION

_IntEnum._convert(
    "_SSLMethod",
    __name__,
    lambda name: name.startswith("PROTOCOL_") and name != "PROTOCOL_SSLv23",
    source=_ssl,
)
_IntFlag._convert("Options", __name__, lambda name: name.startswith("OP_"), source=_ssl)
_IntEnum._convert(
    "AlertDescription",
    __name__,
    lambda name: name.startswith("ALERT_DESCRIPTION_"),
    source=_ssl,
)
_IntEnum._convert(
    "SSLErrorNumber", __name__, lambda name: name.startswith("SSL_ERROR_"), source=_ssl
)
_IntFlag._convert(
    "VerifyFlags", __name__, lambda name: name.startswith("VERIFY_"), source=_ssl
)
_IntEnum._convert(
    "VerifyMode", __name__, lambda name: name.startswith("CERT_"), source=_ssl
)
PROTOCOL_SSLv23 = _SSLMethod.PROTOCOL_SSLv23 = _SSLMethod.PROTOCOL_TLS
_PROTOCOL_NAMES = {value: name for name, value in _SSLMethod.__members__.items()}
_SSLv2_IF_EXISTS = getattr(_SSLMethod, "PROTOCOL_SSLv2", None)
if sys.platform == "win32":
    from _ssl import enum_certificates, enum_crls
from socket import socket, AF_INET, SOCK_STREAM, create_connection
from socket import SOL_SOCKET, SO_TYPE
import base64, errno, warnings

socket_error = OSError
if _ssl.HAS_TLS_UNIQUE:
    CHANNEL_BINDING_TYPES = ["tls-unique"]
else:
    CHANNEL_BINDING_TYPES = []
_DEFAULT_CIPHERS = "TLS13-AES-256-GCM-SHA384:TLS13-CHACHA20-POLY1305-SHA256:TLS13-AES-128-GCM-SHA256:ECDH+AESGCM:ECDH+CHACHA20:DH+AESGCM:DH+CHACHA20:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+HIGH:DH+HIGH:RSA+AESGCM:RSA+AES:RSA+HIGH:!aNULL:!eNULL:!MD5:!3DES"
_RESTRICTED_SERVER_CIPHERS = "TLS13-AES-256-GCM-SHA384:TLS13-CHACHA20-POLY1305-SHA256:TLS13-AES-128-GCM-SHA256:ECDH+AESGCM:ECDH+CHACHA20:DH+AESGCM:DH+CHACHA20:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+HIGH:DH+HIGH:RSA+AESGCM:RSA+AES:RSA+HIGH:!aNULL:!eNULL:!MD5:!DSS:!RC4:!3DES"


class CertificateError(ValueError):
    pass


def _dnsname_match(dn, hostname, max_wildcards=1):
    """Matching according to RFC 6125, section 6.4.3
    
    http://tools.ietf.org/html/rfc6125#section-6.4.3
    """
    pats = []
    if not dn:
        return False
    leftmost, *remainder = dn.split(".")
    wildcards = leftmost.count("*")
    if wildcards > max_wildcards:
        raise CertificateError(
            "too many wildcards in certificate DNS name: " + repr(dn)
        )
    if not wildcards:
        return dn.lower() == hostname.lower()
    if leftmost == "*":
        pats.append("[^.]+")
    else:
        if leftmost.startswith("xn--") or hostname.startswith("xn--"):
            pats.append(re.escape(leftmost))
        else:
            pats.append(re.escape(leftmost).replace("\\*", "[^.]*"))
        for frag in remainder:
            pats.append(re.escape(frag))

        pat = re.compile("\\A" + ("\\.").join(pats) + "\\Z", re.IGNORECASE)
        return pat.match(hostname)


def _ipaddress_match(ipname, host_ip):
    """Exact matching of IP addresses.
    
    RFC 6125 explicitly doesn't define an algorithm for this
    (section 1.7.2 - "Out of Scope").
    """
    ip = ipaddress.ip_address(ipname.rstrip())
    return ip == host_ip


def match_hostname(cert, hostname):
    """Verify that *cert* (in decoded format as returned by
    SSLSocket.getpeercert()) matches the *hostname*.  RFC 2818 and RFC 6125
    rules are followed, but IP addresses are not accepted for *hostname*.
    
    CertificateError is raised on failure. On success, the function
    returns nothing.
    """
    if not cert:
        raise ValueError(
            "empty or no certificate, match_hostname needs a SSL socket or SSL context with either CERT_OPTIONAL or CERT_REQUIRED"
        )
    try:
        host_ip = ipaddress.ip_address(hostname)
    except ValueError:
        host_ip = None

    dnsnames = []
    san = cert.get("subjectAltName", ())
    for key, value in san:
        if key == "DNS":
            if host_ip is None:
                if _dnsname_match(value, hostname):
                    return
                dnsnames.append(value)
        elif key == "IP Address":
            if host_ip is not None:
                if _ipaddress_match(value, host_ip):
                    return
                dnsnames.append(value)

    if not dnsnames:
        for sub in cert.get("subject", ()):
            for key, value in sub:
                if key == "commonName":
                    if _dnsname_match(value, hostname):
                        return
                    dnsnames.append(value)

    if len(dnsnames) > 1:
        raise CertificateError(
            "hostname %r doesn't match either of %s"
            % (hostname, (", ").join(map(repr, dnsnames)))
        )
    else:
        if len(dnsnames) == 1:
            raise CertificateError(
                "hostname %r doesn't match %r" % (hostname, dnsnames[0])
            )
        else:
            raise CertificateError(
                "no appropriate commonName or subjectAltName fields were found"
            )


DefaultVerifyPaths = namedtuple(
    "DefaultVerifyPaths",
    "cafile capath openssl_cafile_env openssl_cafile openssl_capath_env openssl_capath",
)


def get_default_verify_paths():
    """Return paths to default cafile and capath.
    """
    parts = _ssl.get_default_verify_paths()
    cafile = os.environ.get(parts[0], parts[1])
    capath = os.environ.get(parts[2], parts[3])
    return DefaultVerifyPaths(
        cafile if os.path.isfile(cafile) else None,
        capath if os.path.isdir(capath) else None,
        *parts
    )


class _ASN1Object(namedtuple("_ASN1Object", "nid shortname longname oid")):
    """ASN.1 object identifier lookup
    """

    __slots__ = ()

    def __new__(cls, oid):
        return super().__new__(cls, *_txt2obj(oid, name=False))

    @classmethod
    def fromnid(cls, nid):
        """Create _ASN1Object from OpenSSL numeric ID
        """
        return super().__new__(cls, *_nid2obj(nid))

    @classmethod
    def fromname(cls, name):
        """Create _ASN1Object from short name, long name or OID
        """
        return super().__new__(cls, *_txt2obj(name, name=True))


class Purpose(_ASN1Object, _Enum):
    """SSLContext purpose flags with X509v3 Extended Key Usage objects
    """

    SERVER_AUTH = "1.3.6.1.5.5.7.3.1"
    CLIENT_AUTH = "1.3.6.1.5.5.7.3.2"


class SSLContext(_SSLContext):
    """An SSLContext holds various SSL-related configuration options and
    data, such as certificates and possibly a private key."""

    __slots__ = ("protocol", "__weakref__")
    _windows_cert_stores = ("CA", "ROOT")

    def __new__(cls, protocol=PROTOCOL_TLS, *args, **kwargs):
        self = _SSLContext.__new__(cls, protocol)
        if protocol != _SSLv2_IF_EXISTS:
            self.set_ciphers(_DEFAULT_CIPHERS)
        return self

    def __init__(self, protocol=PROTOCOL_TLS):
        self.protocol = protocol

    def wrap_socket(
        self,
        sock,
        server_side=False,
        do_handshake_on_connect=True,
        suppress_ragged_eofs=True,
        server_hostname=None,
        session=None,
    ):
        return SSLSocket(
            sock=sock,
            server_side=server_side,
            do_handshake_on_connect=do_handshake_on_connect,
            suppress_ragged_eofs=suppress_ragged_eofs,
            server_hostname=server_hostname,
            _context=self,
            _session=session,
        )

    def wrap_bio(
        self, incoming, outgoing, server_side=False, server_hostname=None, session=None
    ):
        sslobj = self._wrap_bio(
            incoming, outgoing, server_side=server_side, server_hostname=server_hostname
        )
        return SSLObject(sslobj, session=session)

    def set_npn_protocols(self, npn_protocols):
        protos = bytearray()
        for protocol in npn_protocols:
            b = bytes(protocol, "ascii")
            if len(b) == 0 or len(b) > 255:
                raise SSLError("NPN protocols must be 1 to 255 in length")
            protos.append(len(b))
            protos.extend(b)

        self._set_npn_protocols(protos)

    def set_alpn_protocols(self, alpn_protocols):
        protos = bytearray()
        for protocol in alpn_protocols:
            b = bytes(protocol, "ascii")
            if len(b) == 0 or len(b) > 255:
                raise SSLError("ALPN protocols must be 1 to 255 in length")
            protos.append(len(b))
            protos.extend(b)

        self._set_alpn_protocols(protos)

    def _load_windows_store_certs(self, storename, purpose):
        certs = bytearray()
        try:
            for cert, encoding, trust in enum_certificates(storename):
                if encoding == "x509_asn":
                    if trust is True or purpose.oid in trust:
                        certs.extend(cert)

        except PermissionError:
            warnings.warn("unable to enumerate Windows certificate store")

        if certs:
            self.load_verify_locations(cadata=certs)
        return certs

    def load_default_certs(self, purpose=Purpose.SERVER_AUTH):
        if not isinstance(purpose, _ASN1Object):
            raise TypeError(purpose)
        if sys.platform == "win32":
            for storename in self._windows_cert_stores:
                self._load_windows_store_certs(storename, purpose)

        self.set_default_verify_paths()

    @property
    def options(self):
        return Options(super().options)

    @options.setter
    def options(self, value):
        super(SSLContext, SSLContext).options.__set__(self, value)

    @property
    def verify_flags(self):
        return VerifyFlags(super().verify_flags)

    @verify_flags.setter
    def verify_flags(self, value):
        super(SSLContext, SSLContext).verify_flags.__set__(self, value)

    @property
    def verify_mode(self):
        value = super().verify_mode
        try:
            return VerifyMode(value)
        except ValueError:
            return value

    @verify_mode.setter
    def verify_mode(self, value):
        super(SSLContext, SSLContext).verify_mode.__set__(self, value)


def create_default_context(
    purpose=Purpose.SERVER_AUTH, *, cafile=None, capath=None, cadata=None
):
    """Create a SSLContext object with default settings.
    
    NOTE: The protocol and settings may change anytime without prior
          deprecation. The values represent a fair balance between maximum
          compatibility and security.
    """
    if not isinstance(purpose, _ASN1Object):
        raise TypeError(purpose)
    context = SSLContext(PROTOCOL_TLS)
    if purpose == Purpose.SERVER_AUTH:
        context.verify_mode = CERT_REQUIRED
        context.check_hostname = True
    else:
        if purpose == Purpose.CLIENT_AUTH:
            context.set_ciphers(_RESTRICTED_SERVER_CIPHERS)
    if cafile or capath or cadata:
        context.load_verify_locations(cafile, capath, cadata)
    else:
        if context.verify_mode != CERT_NONE:
            context.load_default_certs(purpose)
    return context


def _create_unverified_context(
    protocol=PROTOCOL_TLS,
    *,
    cert_reqs=None,
    check_hostname=False,
    purpose=Purpose.SERVER_AUTH,
    certfile=None,
    keyfile=None,
    cafile=None,
    capath=None,
    cadata=None
):
    """Create a SSLContext object for Python stdlib modules
    
    All Python stdlib modules shall use this function to create SSLContext
    objects in order to keep common settings in one place. The configuration
    is less restrict than create_default_context()'s to increase backward
    compatibility.
    """
    if not isinstance(purpose, _ASN1Object):
        raise TypeError(purpose)
    context = SSLContext(protocol)
    if cert_reqs is not None:
        context.verify_mode = cert_reqs
    context.check_hostname = check_hostname
    if keyfile:
        if not certfile:
            raise ValueError("certfile must be specified")
    if certfile or keyfile:
        context.load_cert_chain(certfile, keyfile)
    if cafile or capath or cadata:
        context.load_verify_locations(cafile, capath, cadata)
    else:
        if context.verify_mode != CERT_NONE:
            context.load_default_certs(purpose)
    return context


_create_default_https_context = create_default_context
_create_stdlib_context = _create_unverified_context


class SSLObject:
    """This class implements an interface on top of a low-level SSL object as
    implemented by OpenSSL. This object captures the state of an SSL connection
    but does not provide any network IO itself. IO needs to be performed
    through separate "BIO" objects which are OpenSSL's IO abstraction layer.
    
    This class does not have a public constructor. Instances are returned by
    ``SSLContext.wrap_bio``. This class is typically used by framework authors
    that want to implement asynchronous IO for SSL through memory buffers.
    
    When compared to ``SSLSocket``, this object lacks the following features:
    
     * Any form of network IO incluging methods such as ``recv`` and ``send``.
     * The ``do_handshake_on_connect`` and ``suppress_ragged_eofs`` machinery.
    """

    def __init__(self, sslobj, owner=None, session=None):
        self._sslobj = sslobj
        self._sslobj.owner = owner or self
        if session is not None:
            self._sslobj.session = session

    @property
    def context(self):
        """The SSLContext that is currently in use."""
        return self._sslobj.context

    @context.setter
    def context(self, ctx):
        self._sslobj.context = ctx

    @property
    def session(self):
        """The SSLSession for client socket."""
        return self._sslobj.session

    @session.setter
    def session(self, session):
        self._sslobj.session = session

    @property
    def session_reused(self):
        """Was the client session reused during handshake"""
        return self._sslobj.session_reused

    @property
    def server_side(self):
        """Whether this is a server-side socket."""
        return self._sslobj.server_side

    @property
    def server_hostname(self):
        """The currently set server hostname (for SNI), or ``None`` if no
        server hostame is set."""
        return self._sslobj.server_hostname

    def read(self, len=1024, buffer=None):
        """Read up to 'len' bytes from the SSL object and return them.
        
        If 'buffer' is provided, read into this buffer and return the number of
        bytes read.
        """
        if buffer is not None:
            v = self._sslobj.read(len, buffer)
        else:
            v = self._sslobj.read(len)
        return v

    def write(self, data):
        """Write 'data' to the SSL object and return the number of bytes
        written.
        
        The 'data' argument must support the buffer interface.
        """
        return self._sslobj.write(data)

    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 selected_npn_protocol(self):
        """Return the currently selected NPN protocol as a string, or ``None``
        if a next protocol was not negotiated or if NPN is not supported by one
        of the peers."""
        if _ssl.HAS_NPN:
            return self._sslobj.selected_npn_protocol()

    def selected_alpn_protocol(self):
        """Return the currently selected ALPN protocol as a string, or ``None``
        if a next protocol was not negotiated or if ALPN is not supported by one
        of the peers."""
        if _ssl.HAS_ALPN:
            return self._sslobj.selected_alpn_protocol()

    def cipher(self):
        """Return the currently selected cipher as a 3-tuple ``(name,
        ssl_version, secret_bits)``."""
        return self._sslobj.cipher()

    def shared_ciphers(self):
        """Return a list of ciphers shared by the client during the handshake or
        None if this is not a valid server connection.
        """
        return self._sslobj.shared_ciphers()

    def compression(self):
        """Return the current compression algorithm in use, or ``None`` if
        compression was not negotiated or not supported by one of the peers."""
        return self._sslobj.compression()

    def pending(self):
        """Return the number of bytes that can be read immediately."""
        return self._sslobj.pending()

    def do_handshake(self):
        """Start the SSL/TLS handshake."""
        self._sslobj.do_handshake()
        if self.context.check_hostname:
            if not self.server_hostname:
                raise ValueError("check_hostname needs server_hostname argument")
            match_hostname(self.getpeercert(), self.server_hostname)

    def unwrap(self):
        """Start the SSL shutdown handshake."""
        return self._sslobj.shutdown()

    def get_channel_binding(self, cb_type="tls-unique"):
        """Get channel binding data for current connection.  Raise ValueError
        if the requested `cb_type` is not supported.  Return bytes of the data
        or None if the data is not available (e.g. before the handshake)."""
        if cb_type not in CHANNEL_BINDING_TYPES:
            raise ValueError("Unsupported channel binding type")
        if cb_type != "tls-unique":
            raise NotImplementedError(
                ("{0} channel binding type not implemented").format(cb_type)
            )
        return self._sslobj.tls_unique_cb()

    def version(self):
        """Return a string identifying the protocol version used by the
        current SSL channel. """
        return self._sslobj.version()


class SSLSocket(socket):
    """This class implements a subtype of socket.socket that wraps
    the underlying OS socket in an SSL context when necessary, and
    provides read and write methods over that channel."""

    def __init__(
        self,
        sock=None,
        keyfile=None,
        certfile=None,
        server_side=False,
        cert_reqs=CERT_NONE,
        ssl_version=PROTOCOL_TLS,
        ca_certs=None,
        do_handshake_on_connect=True,
        family=AF_INET,
        type=SOCK_STREAM,
        proto=0,
        fileno=None,
        suppress_ragged_eofs=True,
        npn_protocols=None,
        ciphers=None,
        server_hostname=None,
        _context=None,
        _session=None,
    ):
        if _context:
            self._context = _context
        else:
            if server_side:
                if not certfile:
                    raise ValueError(
                        "certfile must be specified for server-side operations"
                    )
            if keyfile:
                if not certfile:
                    raise ValueError("certfile must be specified")
            if certfile:
                if not keyfile:
                    keyfile = certfile
            self._context = SSLContext(ssl_version)
            self._context.verify_mode = cert_reqs
            if ca_certs:
                self._context.load_verify_locations(ca_certs)
            if certfile:
                self._context.load_cert_chain(certfile, keyfile)
            if npn_protocols:
                self._context.set_npn_protocols(npn_protocols)
            if ciphers:
                self._context.set_ciphers(ciphers)
            self.keyfile = keyfile
            self.certfile = certfile
            self.cert_reqs = cert_reqs
            self.ssl_version = ssl_version
            self.ca_certs = ca_certs
            self.ciphers = ciphers
        if sock.getsockopt(SOL_SOCKET, SO_TYPE) != SOCK_STREAM:
            raise NotImplementedError("only stream sockets are supported")
        if server_side:
            if server_hostname:
                raise ValueError("server_hostname can only be specified in client mode")
            if _session is not None:
                raise ValueError("session can only be specified in client mode")
        if self._context.check_hostname and not server_hostname:
            raise ValueError("check_hostname requires server_hostname")
        self._session = _session
        self.server_side = server_side
        self.server_hostname = server_hostname
        self.do_handshake_on_connect = do_handshake_on_connect
        self.suppress_ragged_eofs = suppress_ragged_eofs
        if sock is not None:
            socket.__init__(
                self,
                family=sock.family,
                type=sock.type,
                proto=sock.proto,
                fileno=sock.fileno(),
            )
            self.settimeout(sock.gettimeout())
            sock.detach()
        else:
            if fileno is not None:
                socket.__init__(self, fileno=fileno)
            else:
                socket.__init__(self, family=family, type=type, proto=proto)
            try:
                self.getpeername()
            except OSError as e:
                if e.errno != errno.ENOTCONN:
                    raise
                connected = False
            else:
                connected = True

            self._closed = False
            self._sslobj = None
            self._connected = connected
            if connected:
                pass
        try:
            sslobj = self._context._wrap_socket(self, server_side, server_hostname)
            self._sslobj = SSLObject(sslobj, owner=self, session=self._session)
            if do_handshake_on_connect:
                timeout = self.gettimeout()
                if timeout == 0.0:
                    raise ValueError(
                        "do_handshake_on_connect should not be specified for non-blocking sockets"
                    )
                self.do_handshake()
        except (OSError, ValueError):
            self.close()
            raise

    @property
    def context(self):
        return self._context

    @context.setter
    def context(self, ctx):
        self._context = ctx
        self._sslobj.context = ctx

    @property
    def session(self):
        """The SSLSession for client socket."""
        if self._sslobj is not None:
            return self._sslobj.session

    @session.setter
    def session(self, session):
        self._session = session
        if self._sslobj is not None:
            self._sslobj.session = session

    @property
    def session_reused(self):
        """Was the client session reused during handshake"""
        if self._sslobj is not None:
            return self._sslobj.session_reused

    def dup(self):
        raise NotImplemented("Can't dup() %s instances" % self.__class__.__name__)

    def _checkClosed(self, msg=None):
        pass

    def _check_connected(self):
        if not self._connected:
            self.getpeername()

    def read(self, len=1024, buffer=None):
        """Read up to LEN bytes and return them.
        Return zero-length string on EOF."""
        self._checkClosed()
        if not self._sslobj:
            raise ValueError("Read on closed or unwrapped SSL socket.")
        try:
            return self._sslobj.read(len, buffer)
        except SSLError as x:
            if x.args[0] == SSL_ERROR_EOF:
                if self.suppress_ragged_eofs:
                    if buffer is not None:
                        return 0
                    return b""
            else:
                raise

    def write(self, data):
        """Write DATA to the underlying SSL channel.  Returns
        number of bytes of DATA actually transmitted."""
        self._checkClosed()
        if not self._sslobj:
            raise ValueError("Write on closed or unwrapped SSL socket.")
        return self._sslobj.write(data)

    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."""
        self._checkClosed()
        self._check_connected()
        return self._sslobj.getpeercert(binary_form)

    def selected_npn_protocol(self):
        self._checkClosed()
        if not self._sslobj or not _ssl.HAS_NPN:
            return
        else:
            return self._sslobj.selected_npn_protocol()

    def selected_alpn_protocol(self):
        self._checkClosed()
        if not self._sslobj or not _ssl.HAS_ALPN:
            return
        else:
            return self._sslobj.selected_alpn_protocol()

    def cipher(self):
        self._checkClosed()
        if not self._sslobj:
            return
        else:
            return self._sslobj.cipher()

    def shared_ciphers(self):
        self._checkClosed()
        if not self._sslobj:
            return
        else:
            return self._sslobj.shared_ciphers()

    def compression(self):
        self._checkClosed()
        if not self._sslobj:
            return
        else:
            return self._sslobj.compression()

    def send(self, data, flags=0):
        self._checkClosed()
        if self._sslobj:
            if flags != 0:
                raise ValueError(
                    "non-zero flags not allowed in calls to send() on %s"
                    % self.__class__
                )
            return self._sslobj.write(data)
        else:
            return socket.send(self, data, flags)

    def sendto(self, data, flags_or_addr, addr=None):
        self._checkClosed()
        if self._sslobj:
            raise ValueError("sendto not allowed on instances of %s" % self.__class__)
        else:
            if addr is None:
                return socket.sendto(self, data, flags_or_addr)
            return socket.sendto(self, data, flags_or_addr, addr)

    def sendmsg(self, *args, **kwargs):
        raise NotImplementedError(
            "sendmsg not allowed on instances of %s" % self.__class__
        )

    def sendall(self, data, flags=0):
        self._checkClosed()
        if self._sslobj:
            if flags != 0:
                raise ValueError(
                    "non-zero flags not allowed in calls to sendall() on %s"
                    % self.__class__
                )
            count = 0
            with memoryview(data) as (view):
                with view.cast("B") as (byte_view):
                    amount = len(byte_view)
                    while count < amount:
                        v = self.send(byte_view[count:])
                        count += v

        else:
            return socket.sendall(self, data, flags)

    def sendfile(self, file, offset=0, count=None):
        """Send a file, possibly by using os.sendfile() if this is a
        clear-text socket.  Return the total number of bytes sent.
        """
        if self._sslobj is None:
            return super().sendfile(file, offset, count)
        else:
            return self._sendfile_use_send(file, offset, count)

    def recv(self, buflen=1024, flags=0):
        self._checkClosed()
        if self._sslobj:
            if flags != 0:
                raise ValueError(
                    "non-zero flags not allowed in calls to recv() on %s"
                    % self.__class__
                )
            return self.read(buflen)
        else:
            return socket.recv(self, buflen, flags)

    def recv_into(self, buffer, nbytes=None, flags=0):
        self._checkClosed()
        if buffer:
            if nbytes is None:
                nbytes = len(buffer)
            if 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__
                )
            return self.read(nbytes, buffer)
        else:
            return socket.recv_into(self, buffer, nbytes, flags)

    def recvfrom(self, buflen=1024, flags=0):
        self._checkClosed()
        if self._sslobj:
            raise ValueError("recvfrom not allowed on instances of %s" % self.__class__)
        else:
            return socket.recvfrom(self, buflen, flags)

    def recvfrom_into(self, buffer, nbytes=None, flags=0):
        self._checkClosed()
        if self._sslobj:
            raise ValueError(
                "recvfrom_into not allowed on instances of %s" % self.__class__
            )
        else:
            return socket.recvfrom_into(self, buffer, nbytes, flags)

    def recvmsg(self, *args, **kwargs):
        raise NotImplementedError(
            "recvmsg not allowed on instances of %s" % self.__class__
        )

    def recvmsg_into(self, *args, **kwargs):
        raise NotImplementedError(
            "recvmsg_into not allowed on instances of %s" % self.__class__
        )

    def pending(self):
        self._checkClosed()
        if self._sslobj:
            return self._sslobj.pending()
        else:
            return 0

    def shutdown(self, how):
        self._checkClosed()
        self._sslobj = None
        socket.shutdown(self, how)

    def unwrap(self):
        if self._sslobj:
            s = self._sslobj.unwrap()
            self._sslobj = None
            return s
        raise ValueError("No SSL wrapper around " + str(self))

    def _real_close(self):
        self._sslobj = None
        socket._real_close(self)

    def do_handshake(self, block=False):
        """Perform a TLS/SSL handshake."""
        self._check_connected()
        timeout = self.gettimeout()
        try:
            if timeout == 0.0:
                if block:
                    self.settimeout(None)
            self._sslobj.do_handshake()
        finally:
            self.settimeout(timeout)

    def _real_connect(self, addr, connect_ex):
        if self.server_side:
            raise ValueError("can't connect in server-side mode")
        if self._connected:
            raise ValueError("attempt to connect already-connected SSLSocket!")
        sslobj = self.context._wrap_socket(self, False, self.server_hostname)
        self._sslobj = SSLObject(sslobj, owner=self, session=self._session)
        try:
            if connect_ex:
                rc = socket.connect_ex(self, addr)
            else:
                rc = None
                socket.connect(self, addr)
            if not rc:
                self._connected = True
                if self.do_handshake_on_connect:
                    self.do_handshake()
            return rc
        except (OSError, ValueError):
            self._sslobj = None
            raise

    def connect(self, addr):
        """Connects to remote ADDR, and then wraps the connection in
        an SSL channel."""
        self._real_connect(addr, False)

    def connect_ex(self, addr):
        """Connects to remote ADDR, and then wraps the connection in
        an SSL channel."""
        return self._real_connect(addr, True)

    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."""
        newsock, addr = socket.accept(self)
        newsock = self.context.wrap_socket(
            newsock,
            do_handshake_on_connect=self.do_handshake_on_connect,
            suppress_ragged_eofs=self.suppress_ragged_eofs,
            server_side=True,
        )
        return (newsock, addr)

    def get_channel_binding(self, cb_type="tls-unique"):
        """Get channel binding data for current connection.  Raise ValueError
        if the requested `cb_type` is not supported.  Return bytes of the data
        or None if the data is not available (e.g. before the handshake).
        """
        if self._sslobj is None:
            return
        else:
            return self._sslobj.get_channel_binding(cb_type)

    def version(self):
        """
        Return a string identifying the protocol version used by the
        current SSL channel, or None if there is no established channel.
        """
        if self._sslobj is None:
            return
        else:
            return self._sslobj.version()


def wrap_socket(
    sock,
    keyfile=None,
    certfile=None,
    server_side=False,
    cert_reqs=CERT_NONE,
    ssl_version=PROTOCOL_TLS,
    ca_certs=None,
    do_handshake_on_connect=True,
    suppress_ragged_eofs=True,
    ciphers=None,
):
    return SSLSocket(
        sock=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 cert_time_to_seconds(cert_time):
    """Return the time in seconds since the Epoch, given the timestring
    representing the "notBefore" or "notAfter" date from a certificate
    in ``"%b %d %H:%M:%S %Y %Z"`` strptime format (C locale).
    
    "notBefore" or "notAfter" dates must use UTC (RFC 5280).
    
    Month is one of: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    UTC should be specified as GMT (see ASN1_TIME_print())
    """
    from time import strptime
    from calendar import timegm

    months = (
        "Jan",
        "Feb",
        "Mar",
        "Apr",
        "May",
        "Jun",
        "Jul",
        "Aug",
        "Sep",
        "Oct",
        "Nov",
        "Dec",
    )
    time_format = " %d %H:%M:%S %Y GMT"
    try:
        month_number = months.index(cert_time[:3].title()) + 1
    except ValueError:
        raise ValueError(
            'time data %r does not match format "%%b%s"' % (cert_time, time_format)
        )
    else:
        tt = strptime(cert_time[3:], time_format)
        return timegm((tt[0], month_number) + tt[2:6])


PEM_HEADER = "-----BEGIN CERTIFICATE-----"
PEM_FOOTER = "-----END CERTIFICATE-----"


def DER_cert_to_PEM_cert(der_cert_bytes):
    """Takes a certificate in binary DER format and returns the
    PEM version of it as a string."""
    f = str(base64.standard_b64encode(der_cert_bytes), "ASCII", "strict")
    return PEM_HEADER + "\n" + textwrap.fill(f, 64) + "\n" + PEM_FOOTER + "\n"


def PEM_cert_to_DER_cert(pem_cert_string):
    """Takes a certificate in ASCII PEM format and returns the
    DER-encoded version of it as a byte sequence"""
    if not pem_cert_string.startswith(PEM_HEADER):
        raise ValueError("Invalid PEM encoding; must start with %s" % PEM_HEADER)
    if not pem_cert_string.strip().endswith(PEM_FOOTER):
        raise ValueError("Invalid PEM encoding; must end with %s" % PEM_FOOTER)
    d = pem_cert_string.strip()[len(PEM_HEADER) : -len(PEM_FOOTER)]
    return base64.decodebytes(d.encode("ASCII", "strict"))


def get_server_certificate(addr, ssl_version=PROTOCOL_TLS, 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."""
    host, port = addr
    if ca_certs is not None:
        cert_reqs = CERT_REQUIRED
    else:
        cert_reqs = CERT_NONE
    context = _create_stdlib_context(ssl_version, cert_reqs=cert_reqs, cafile=ca_certs)
    with create_connection(addr) as (sock):
        with context.wrap_socket(sock) as (sslsock):
            dercert = sslsock.getpeercert(True)
    return DER_cert_to_PEM_cert(dercert)


def get_protocol_name(protocol_code):
    return _PROTOCOL_NAMES.get(protocol_code, "<unknown>")