# SPDX-License-Identifier: MIT
"""
SSL with SNI_-support for Python 2. Follow these instructions if you would
like to verify SSL certificates in Python 2. Note, the default libraries do
*not* do certificate checking; you need to do additional work to validate
certificates yourself.
This needs the following packages installed:
* pyOpenSSL (tested with 16.0.0)
* cryptography (minimum 1.3.4, from pyopenssl)
* idna (minimum 2.0, from cryptography)
However, pyopenssl depends on cryptography, which depends on idna, so while we
use all three directly here we end up having relatively few packages required.
You can install them with the following command:
    pip install pyopenssl cryptography idna
To activate certificate checking, call
:func:`~urllib3.contrib.pyopenssl.inject_into_urllib3` from your Python code
before you begin making HTTP requests. This can be done in a ``sitecustomize``
module, or at any other time before your application begins using ``urllib3``,
like this::
    try:
        import urllib3.contrib.pyopenssl
        urllib3.contrib.pyopenssl.inject_into_urllib3()
    except ImportError:
        pass
Now you can use :mod:`urllib3` as you normally would, and it will support SNI
when the required modules are installed.
Activating this module also has the positive side effect of disabling SSL/TLS
compression in Python 2 (see `CRIME attack`_).
If you want to configure the default list of supported cipher suites, you can
set the ``urllib3.contrib.pyopenssl.DEFAULT_SSL_CIPHER_LIST`` variable.
.. _sni: https://en.wikipedia.org/wiki/Server_Name_Indication
.. _crime attack: https://en.wikipedia.org/wiki/CRIME_(security_exploit)
"""
from __future__ import absolute_import
import OpenSSL.SSL
from cryptography import x509
from cryptography.hazmat.backends.openssl import backend as openssl_backend
from cryptography.hazmat.backends.openssl.x509 import _Certificate
from socket import timeout, error as SocketError
from io import BytesIO
try:  # Platform-specific: Python 2
    from socket import _fileobject
except ImportError:  # Platform-specific: Python 3
    _fileobject = None
    from ..packages.backports.makefile import backport_makefile
import logging
import ssl
try:
    import six
except ImportError:
    from ..packages import six
import sys
from .. import util
__all__ = ['inject_into_urllib3', 'extract_from_urllib3']
# SNI always works.
HAS_SNI = True
# Map from urllib3 to PyOpenSSL compatible parameter-values.
_openssl_versions = {
    ssl.PROTOCOL_SSLv23: OpenSSL.SSL.SSLv23_METHOD,
    ssl.PROTOCOL_TLSv1: OpenSSL.SSL.TLSv1_METHOD,
}
if hasattr(ssl, 'PROTOCOL_TLSv1_1') and hasattr(OpenSSL.SSL, 'TLSv1_1_METHOD'):
    _openssl_versions[ssl.PROTOCOL_TLSv1_1] = OpenSSL.SSL.TLSv1_1_METHOD
if hasattr(ssl, 'PROTOCOL_TLSv1_2') and hasattr(OpenSSL.SSL, 'TLSv1_2_METHOD'):
    _openssl_versions[ssl.PROTOCOL_TLSv1_2] = OpenSSL.SSL.TLSv1_2_METHOD
try:
    _openssl_versions.update({ssl.PROTOCOL_SSLv3: OpenSSL.SSL.SSLv3_METHOD})
except AttributeError:
    pass
_stdlib_to_openssl_verify = {
    ssl.CERT_NONE: OpenSSL.SSL.VERIFY_NONE,
    ssl.CERT_OPTIONAL: OpenSSL.SSL.VERIFY_PEER,
    ssl.CERT_REQUIRED:
        OpenSSL.SSL.VERIFY_PEER + OpenSSL.SSL.VERIFY_FAIL_IF_NO_PEER_CERT,
}
_openssl_to_stdlib_verify = dict(
    (v, k) for k, v in _stdlib_to_openssl_verify.items()
)
# OpenSSL will only write 16K at a time
SSL_WRITE_BLOCKSIZE = 16384
orig_util_HAS_SNI = util.HAS_SNI
orig_util_SSLContext = util.ssl_.SSLContext
log = logging.getLogger(__name__)
def inject_into_urllib3():
    'Monkey-patch urllib3 with PyOpenSSL-backed SSL-support.'
    _validate_dependencies_met()
    util.ssl_.SSLContext = PyOpenSSLContext
    util.HAS_SNI = HAS_SNI
    util.ssl_.HAS_SNI = HAS_SNI
    util.IS_PYOPENSSL = True
    util.ssl_.IS_PYOPENSSL = True
def extract_from_urllib3():
    'Undo monkey-patching by :func:`inject_into_urllib3`.'
    util.ssl_.SSLContext = orig_util_SSLContext
    util.HAS_SNI = orig_util_HAS_SNI
    util.ssl_.HAS_SNI = orig_util_HAS_SNI
    util.IS_PYOPENSSL = False
    util.ssl_.IS_PYOPENSSL = False
def _validate_dependencies_met():
    """
    Verifies that PyOpenSSL's package-level dependencies have been met.
    Throws `ImportError` if they are not met.
    """
    # Method added in `cryptography==1.1`; not available in older versions
    from cryptography.x509.extensions import Extensions
    if getattr(Extensions, "get_extension_for_class", None) is None:
        raise ImportError("'cryptography' module missing required functionality.  "
                          "Try upgrading to v1.3.4 or newer.")
    # pyOpenSSL 0.14 and above use cryptography for OpenSSL bindings. The _x509
    # attribute is only present on those versions.
    from OpenSSL.crypto import X509
    x509 = X509()
    if getattr(x509, "_x509", None) is None:
        raise ImportError("'pyOpenSSL' module missing required functionality. "
                          "Try upgrading to v0.14 or newer.")
def _dnsname_to_stdlib(name):
    """
    Converts a dNSName SubjectAlternativeName field to the form used by the
    standard library on the given Python version.
    Cryptography produces a dNSName as a unicode string that was idna-decoded
    from ASCII bytes. We need to idna-encode that string to get it back, and
    then on Python 3 we also need to convert to unicode via UTF-8 (the stdlib
    uses PyUnicode_FromStringAndSize on it, which decodes via UTF-8).
    """
    def idna_encode(name):
        """
        Borrowed wholesale from the Python Cryptography Project. It turns out
        that we can't just safely call `idna.encode`: it can explode for
        wildcard names. This avoids that problem.
        """
        import idna
        for prefix in [u'*.', u'.']:
            if name.startswith(prefix):
                name = name[len(prefix):]
                return prefix.encode('ascii') + idna.encode(name)
        return idna.encode(name)
    name = idna_encode(name)
    if sys.version_info >= (3, 0):
        name = name.decode('utf-8')
    return name
def get_subj_alt_name(peer_cert):
    """
    Given an PyOpenSSL certificate, provides all the subject alternative names.
    """
    # Pass the cert to cryptography, which has much better APIs for this.
    # This is technically using private APIs, but should work across all
    # relevant versions until PyOpenSSL gets something proper for this.
    cert = _Certificate(openssl_backend, peer_cert._x509)
    # We want to find the SAN extension. Ask Cryptography to locate it (it's
    # faster than looping in Python)
    try:
        ext = cert.extensions.get_extension_for_class(
            x509.SubjectAlternativeName
        ).value
    except x509.ExtensionNotFound:
        # No such extension, return the empty list.
        return []
    except (x509.DuplicateExtension, x509.UnsupportedExtension,
            x509.UnsupportedGeneralNameType, UnicodeError) as e:
        # A problem has been found with the quality of the certificate. Assume
        # no SAN field is present.
        log.warning(
            "A problem was encountered with the certificate that prevented "
            "urllib3 from finding the SubjectAlternativeName field. This can "
            "affect certificate validation. The error was %s",
            e,
        )
        return []
    # We want to return dNSName and iPAddress fields. We need to cast the IPs
    # back to strings because the match_hostname function wants them as
    # strings.
    # Sadly the DNS names need to be idna encoded and then, on Python 3, UTF-8
    # decoded. This is pretty frustrating, but that's what the standard library
    # does with certificates, and so we need to attempt to do the same.
    names = [
        ('DNS', _dnsname_to_stdlib(name))
        for name in ext.get_values_for_type(x509.DNSName)
    ]
    names.extend(
        ('IP Address', str(name))
        for name in ext.get_values_for_type(x509.IPAddress)
    )
    return names
class WrappedSocket(object):
    '''API-compatibility wrapper for Python OpenSSL's Connection-class.
    Note: _makefile_refs, _drop() and _reuse() are needed for the garbage
    collector of pypy.
    '''
    def __init__(self, connection, socket, suppress_ragged_eofs=True):
        self.connection = connection
        self.socket = socket
        self.suppress_ragged_eofs = suppress_ragged_eofs
        self._makefile_refs = 0
        self._closed = False
    def fileno(self):
        return self.socket.fileno()
    # Copy-pasted from Python 3.5 source code
    def _decref_socketios(self):
        if self._makefile_refs > 0:
            self._makefile_refs -= 1
        if self._closed:
            self.close()
    def recv(self, *args, **kwargs):
        try:
            data = self.connection.recv(*args, **kwargs)
        except OpenSSL.SSL.SysCallError as e:
            if self.suppress_ragged_eofs and e.args == (-1, 'Unexpected EOF'):
                return b''
            else:
                raise SocketError(str(e))
        except OpenSSL.SSL.ZeroReturnError as e:
            if self.connection.get_shutdown() == OpenSSL.SSL.RECEIVED_SHUTDOWN:
                return b''
            else:
                raise
        except OpenSSL.SSL.WantReadError:
            rd = util.wait_for_read(self.socket, self.socket.gettimeout())
            if not rd:
                raise timeout('The read operation timed out')
            else:
                return self.recv(*args, **kwargs)
        else:
            return data
    def recv_into(self, *args, **kwargs):
        try:
            return self.connection.recv_into(*args, **kwargs)
        except OpenSSL.SSL.SysCallError as e:
            if self.suppress_ragged_eofs and e.args == (-1, 'Unexpected EOF'):
                return 0
            else:
                raise SocketError(str(e))
        except OpenSSL.SSL.ZeroReturnError as e:
            if self.connection.get_shutdown() == OpenSSL.SSL.RECEIVED_SHUTDOWN:
                return 0
            else:
                raise
        except OpenSSL.SSL.WantReadError:
            rd = util.wait_for_read(self.socket, self.socket.gettimeout())
            if not rd:
                raise timeout('The read operation timed out')
            else:
                return self.recv_into(*args, **kwargs)
    def settimeout(self, timeout):
        return self.socket.settimeout(timeout)
    def _send_until_done(self, data):
        while True:
            try:
                return self.connection.send(data)
            except OpenSSL.SSL.WantWriteError:
                wr = util.wait_for_write(self.socket, self.socket.gettimeout())
                if not wr:
                    raise timeout()
                continue
            except OpenSSL.SSL.SysCallError as e:
                raise SocketError(str(e))
    def sendall(self, data):
        total_sent = 0
        while total_sent < len(data):
            sent = self._send_until_done(data[total_sent:total_sent + SSL_WRITE_BLOCKSIZE])
            total_sent += sent
    def shutdown(self):
        # FIXME rethrow compatible exceptions should we ever use this
        self.connection.shutdown()
    def close(self):
        if self._makefile_refs < 1:
            try:
                self._closed = True
                return self.connection.close()
            except OpenSSL.SSL.Error:
                return
        else:
            self._makefile_refs -= 1
    def getpeercert(self, binary_form=False):
        x509 = self.connection.get_peer_certificate()
        if not x509:
            return x509
        if binary_form:
            return OpenSSL.crypto.dump_certificate(
                OpenSSL.crypto.FILETYPE_ASN1,
                x509)
        return {
            'subject': (
                (('commonName', x509.get_subject().CN),),
            ),
            'subjectAltName': get_subj_alt_name(x509)
        }
    def _reuse(self):
        self._makefile_refs += 1
    def _drop(self):
        if self._makefile_refs < 1:
            self.close()
        else:
            self._makefile_refs -= 1
if _fileobject:  # Platform-specific: Python 2
    def makefile(self, mode, bufsize=-1):
        self._makefile_refs += 1
        return _fileobject(self, mode, bufsize, close=True)
else:  # Platform-specific: Python 3
    makefile = backport_makefile
WrappedSocket.makefile = makefile
class PyOpenSSLContext(object):
    """
    I am a wrapper class for the PyOpenSSL ``Context`` object. I am responsible
    for translating the interface of the standard library ``SSLContext`` object
    to calls into PyOpenSSL.
    """
    def __init__(self, protocol):


Answer:         self.protocol = _openssl_versions[protocol]