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Edit File : ssl_.py \| Size : 11.93 KB
from __future__ import absolute_import import errno import warnings import hmac from binascii import hexlify, unhexlify from hashlib import md5, sha1, sha256 from ..exceptions import SSLError, InsecurePlatformWarning, SNIMissingWarning SSLContext = None HAS_SNI = False IS_PYOPENSSL = False IS_SECURETRANSPORT = False # Maps the length of a digest to a possible hash function producing this digest HASHFUNC_MAP = { 32: md5, 40: sha1, 64: sha256, } def _const_compare_digest_backport(a, b): """ Compare two digests of equal length in constant time. The digests must be of type str/bytes. Returns True if the digests match, and False otherwise. """ result = abs(len(a) - len(b)) for l, r in zip(bytearray(a), bytearray(b)): result \|= l ^ r return result == 0 _const_compare_digest = getattr(hmac, 'compare_digest', _const_compare_digest_backport) try: # Test for SSL features import ssl from ssl import wrap_socket, CERT_NONE, PROTOCOL_SSLv23 from ssl import HAS_SNI # Has SNI? except ImportError: pass try: from ssl import OP_NO_SSLv2, OP_NO_SSLv3, OP_NO_COMPRESSION except ImportError: OP_NO_SSLv2, OP_NO_SSLv3 = 0x1000000, 0x2000000 OP_NO_COMPRESSION = 0x20000 # A secure default. # Sources for more information on TLS ciphers: # # - https://wiki.mozilla.org/Security/Server_Side_TLS # - https://www.ssllabs.com/projects/best-practices/index.html # - https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/ # # The general intent is: # - Prefer TLS 1.3 cipher suites # - prefer cipher suites that offer perfect forward secrecy (DHE/ECDHE), # - prefer ECDHE over DHE for better performance, # - prefer any AES-GCM and ChaCha20 over any AES-CBC for better performance and # security, # - prefer AES-GCM over ChaCha20 because hardware-accelerated AES is common, # - disable NULL authentication, MD5 MACs and DSS for security reasons. DEFAULT_CIPHERS = ':'.join([ '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', 'RSA+AESGCM', 'RSA+AES', '!aNULL', '!eNULL', '!MD5', ]) try: from ssl import SSLContext # Modern SSL? except ImportError: import sys class SSLContext(object): # Platform-specific: Python 2 & 3.1 supports_set_ciphers = ((2, 7) <= sys.version_info < (3,) or (3, 2) <= sys.version_info) def __init__(self, protocol_version): self.protocol = protocol_version # Use default values from a real SSLContext self.check_hostname = False self.verify_mode = ssl.CERT_NONE self.ca_certs = None self.options = 0 self.certfile = None self.keyfile = None self.ciphers = None def load_cert_chain(self, certfile, keyfile): self.certfile = certfile self.keyfile = keyfile def load_verify_locations(self, cafile=None, capath=None): self.ca_certs = cafile if capath is not None: raise SSLError("CA directories not supported in older Pythons") def set_ciphers(self, cipher_suite): if not self.supports_set_ciphers: raise TypeError( 'Your version of Python does not support setting ' 'a custom cipher suite. Please upgrade to Python ' '2.7, 3.2, or later if you need this functionality.' ) self.ciphers = cipher_suite def wrap_socket(self, socket, server_hostname=None, server_side=False): warnings.warn( 'A true SSLContext object is not available. This prevents ' 'urllib3 from configuring SSL appropriately and may cause ' 'certain SSL connections to fail. You can upgrade to a newer ' 'version of Python to solve this. For more information, see ' 'https://urllib3.readthedocs.io/en/latest/advanced-usage.html' '#ssl-warnings', InsecurePlatformWarning ) kwargs = { 'keyfile': self.keyfile, 'certfile': self.certfile, 'ca_certs': self.ca_certs, 'cert_reqs': self.verify_mode, 'ssl_version': self.protocol, 'server_side': server_side, } if self.supports_set_ciphers: # Platform-specific: Python 2.7+ return wrap_socket(socket, ciphers=self.ciphers, kwargs) else: # Platform-specific: Python 2.6 return wrap_socket(socket, kwargs) def assert_fingerprint(cert, fingerprint): """ Checks if given fingerprint matches the supplied certificate. :param cert: Certificate as bytes object. :param fingerprint: Fingerprint as string of hexdigits, can be interspersed by colons. """ fingerprint = fingerprint.replace(':', '').lower() digest_length = len(fingerprint) hashfunc = HASHFUNC_MAP.get(digest_length) if not hashfunc: raise SSLError( 'Fingerprint of invalid length: {0}'.format(fingerprint)) # We need encode() here for py32; works on py2 and p33. fingerprint_bytes = unhexlify(fingerprint.encode()) cert_digest = hashfunc(cert).digest() if not _const_compare_digest(cert_digest, fingerprint_bytes): raise SSLError('Fingerprints did not match. Expected "{0}", got "{1}".' .format(fingerprint, hexlify(cert_digest))) def resolve_cert_reqs(candidate): """ Resolves the argument to a numeric constant, which can be passed to the wrap_socket function/method from the ssl module. Defaults to :data:`ssl.CERT_NONE`. If given a string it is assumed to be the name of the constant in the :mod:`ssl` module or its abbrevation. (So you can specify `REQUIRED` instead of `CERT_REQUIRED`. If it's neither `None` nor a string we assume it is already the numeric constant which can directly be passed to wrap_socket. """ if candidate is None: return CERT_NONE if isinstance(candidate, str): res = getattr(ssl, candidate, None) if res is None: res = getattr(ssl, 'CERT_' + candidate) return res return candidate def resolve_ssl_version(candidate): """ like resolve_cert_reqs """ if candidate is None: return PROTOCOL_SSLv23 if isinstance(candidate, str): res = getattr(ssl, candidate, None) if res is None: res = getattr(ssl, 'PROTOCOL_' + candidate) return res return candidate def create_urllib3_context(ssl_version=None, cert_reqs=None, options=None, ciphers=None): """All arguments have the same meaning as ``ssl_wrap_socket``. By default, this function does a lot of the same work that ``ssl.create_default_context`` does on Python 3.4+. It: - Disables SSLv2, SSLv3, and compression - Sets a restricted set of server ciphers If you wish to enable SSLv3, you can do:: from urllib3.util import ssl_ context = ssl_.create_urllib3_context() context.options &= ~ssl_.OP_NO_SSLv3 You can do the same to enable compression (substituting ``COMPRESSION`` for ``SSLv3`` in the last line above). :param ssl_version: The desired protocol version to use. This will default to PROTOCOL_SSLv23 which will negotiate the highest protocol that both the server and your installation of OpenSSL support. :param cert_reqs: Whether to require the certificate verification. This defaults to ``ssl.CERT_REQUIRED``. :param options: Specific OpenSSL options. These default to ``ssl.OP_NO_SSLv2``, ``ssl.OP_NO_SSLv3``, ``ssl.OP_NO_COMPRESSION``. :param ciphers: Which cipher suites to allow the server to select. :returns: Constructed SSLContext object with specified options :rtype: SSLContext """ context = SSLContext(ssl_version or ssl.PROTOCOL_SSLv23) # Setting the default here, as we may have no ssl module on import cert_reqs = ssl.CERT_REQUIRED if cert_reqs is None else cert_reqs if options is None: options = 0 # SSLv2 is easily broken and is considered harmful and dangerous options \|= OP_NO_SSLv2 # SSLv3 has several problems and is now dangerous options \|= OP_NO_SSLv3 # Disable compression to prevent CRIME attacks for OpenSSL 1.0+ # (issue #309) options \|= OP_NO_COMPRESSION context.options \|= options if getattr(context, 'supports_set_ciphers', True): # Platform-specific: Python 2.6 context.set_ciphers(ciphers or DEFAULT_CIPHERS) context.verify_mode = cert_reqs if getattr(context, 'check_hostname', None) is not None: # Platform-specific: Python 3.2 # We do our own verification, including fingerprints and alternative # hostnames. So disable it here context.check_hostname = False return context def ssl_wrap_socket(sock, keyfile=None, certfile=None, cert_reqs=None, ca_certs=None, server_hostname=None, ssl_version=None, ciphers=None, ssl_context=None, ca_cert_dir=None): """ All arguments except for server_hostname, ssl_context, and ca_cert_dir have the same meaning as they do when using :func:`ssl.wrap_socket`. :param server_hostname: When SNI is supported, the expected hostname of the certificate :param ssl_context: A pre-made :class:`SSLContext` object. If none is provided, one will be created using :func:`create_urllib3_context`. :param ciphers: A string of ciphers we wish the client to support. This is not supported on Python 2.6 as the ssl module does not support it. :param ca_cert_dir: A directory containing CA certificates in multiple separate files, as supported by OpenSSL's -CApath flag or the capath argument to SSLContext.load_verify_locations(). """ context = ssl_context if context is None: # Note: This branch of code and all the variables in it are no longer # used by urllib3 itself. We should consider deprecating and removing # this code. context = create_urllib3_context(ssl_version, cert_reqs, ciphers=ciphers) if ca_certs or ca_cert_dir: try: context.load_verify_locations(ca_certs, ca_cert_dir) except IOError as e: # Platform-specific: Python 2.6, 2.7, 3.2 raise SSLError(e) # Py33 raises FileNotFoundError which subclasses OSError # These are not equivalent unless we check the errno attribute except OSError as e: # Platform-specific: Python 3.3 and beyond if e.errno == errno.ENOENT: raise SSLError(e) raise elif ssl_context is None and hasattr(context, 'load_default_certs'): # try to load OS default certs; works well on Windows (require Python3.4+) context.load_default_certs() if certfile: context.load_cert_chain(certfile, keyfile) if HAS_SNI: # Platform-specific: OpenSSL with enabled SNI return context.wrap_socket(sock, server_hostname=server_hostname) warnings.warn( 'An HTTPS request has been made, but the SNI (Subject Name ' 'Indication) extension to TLS is not available on this platform. ' 'This may cause the server to present an incorrect TLS ' 'certificate, which can cause validation failures. You can upgrade to ' 'a newer version of Python to solve this. For more information, see ' 'https://urllib3.readthedocs.io/en/latest/advanced-usage.html' '#ssl-warnings', SNIMissingWarning ) return context.wrap_socket(sock) Back

Edit File : ssl_.py | Size : 11.93 KB

from __future__ import absolute_import
import errno
import warnings
import hmac

from binascii import hexlify, unhexlify
from hashlib import md5, sha1, sha256

from ..exceptions import SSLError, InsecurePlatformWarning, SNIMissingWarning

SSLContext = None
HAS_SNI = False
IS_PYOPENSSL = False
IS_SECURETRANSPORT = False

# Maps the length of a digest to a possible hash function producing this digest
HASHFUNC_MAP = {
    32: md5,
    40: sha1,
    64: sha256,
}

def _const_compare_digest_backport(a, b):
    """
    Compare two digests of equal length in constant time.

The digests must be of type str/bytes.
    Returns True if the digests match, and False otherwise.
    """
    result = abs(len(a) - len(b))
    for l, r in zip(bytearray(a), bytearray(b)):
        result |= l ^ r
    return result == 0

_const_compare_digest = getattr(hmac, 'compare_digest',
                                _const_compare_digest_backport)

try:  # Test for SSL features
    import ssl
    from ssl import wrap_socket, CERT_NONE, PROTOCOL_SSLv23
    from ssl import HAS_SNI  # Has SNI?
except ImportError:
    pass

try:
    from ssl import OP_NO_SSLv2, OP_NO_SSLv3, OP_NO_COMPRESSION
except ImportError:
    OP_NO_SSLv2, OP_NO_SSLv3 = 0x1000000, 0x2000000
    OP_NO_COMPRESSION = 0x20000

# A secure default.
# Sources for more information on TLS ciphers:
#
# - https://wiki.mozilla.org/Security/Server_Side_TLS
# - https://www.ssllabs.com/projects/best-practices/index.html
# - https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
#
# The general intent is:
# - Prefer TLS 1.3 cipher suites
# - prefer cipher suites that offer perfect forward secrecy (DHE/ECDHE),
# - prefer ECDHE over DHE for better performance,
# - prefer any AES-GCM and ChaCha20 over any AES-CBC for better performance and
#   security,
# - prefer AES-GCM over ChaCha20 because hardware-accelerated AES is common,
# - disable NULL authentication, MD5 MACs and DSS for security reasons.
DEFAULT_CIPHERS = ':'.join([
    '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',
    'RSA+AESGCM',
    'RSA+AES',
    '!aNULL',
    '!eNULL',
    '!MD5',
])

try:
    from ssl import SSLContext  # Modern SSL?
except ImportError:
    import sys

class SSLContext(object):  # Platform-specific: Python 2 & 3.1
        supports_set_ciphers = ((2, 7) <= sys.version_info < (3,) or
                                (3, 2) <= sys.version_info)

def __init__(self, protocol_version):
            self.protocol = protocol_version
            # Use default values from a real SSLContext
            self.check_hostname = False
            self.verify_mode = ssl.CERT_NONE
            self.ca_certs = None
            self.options = 0
            self.certfile = None
            self.keyfile = None
            self.ciphers = None

def load_cert_chain(self, certfile, keyfile):
            self.certfile = certfile
            self.keyfile = keyfile

def load_verify_locations(self, cafile=None, capath=None):
            self.ca_certs = cafile

if capath is not None:
                raise SSLError("CA directories not supported in older Pythons")

def set_ciphers(self, cipher_suite):
            if not self.supports_set_ciphers:
                raise TypeError(
                    'Your version of Python does not support setting '
                    'a custom cipher suite. Please upgrade to Python '
                    '2.7, 3.2, or later if you need this functionality.'
                )
            self.ciphers = cipher_suite

def wrap_socket(self, socket, server_hostname=None, server_side=False):
            warnings.warn(
                'A true SSLContext object is not available. This prevents '
                'urllib3 from configuring SSL appropriately and may cause '
                'certain SSL connections to fail. You can upgrade to a newer '
                'version of Python to solve this. For more information, see '
                'https://urllib3.readthedocs.io/en/latest/advanced-usage.html'
                '#ssl-warnings',
                InsecurePlatformWarning
            )
            kwargs = {
                'keyfile': self.keyfile,
                'certfile': self.certfile,
                'ca_certs': self.ca_certs,
                'cert_reqs': self.verify_mode,
                'ssl_version': self.protocol,
                'server_side': server_side,
            }
            if self.supports_set_ciphers:  # Platform-specific: Python 2.7+
                return wrap_socket(socket, ciphers=self.ciphers, **kwargs)
            else:  # Platform-specific: Python 2.6
                return wrap_socket(socket, **kwargs)

def assert_fingerprint(cert, fingerprint):
    """
    Checks if given fingerprint matches the supplied certificate.

:param cert:
        Certificate as bytes object.
    :param fingerprint:
        Fingerprint as string of hexdigits, can be interspersed by colons.
    """

fingerprint = fingerprint.replace(':', '').lower()
    digest_length = len(fingerprint)
    hashfunc = HASHFUNC_MAP.get(digest_length)
    if not hashfunc:
        raise SSLError(
            'Fingerprint of invalid length: {0}'.format(fingerprint))

# We need encode() here for py32; works on py2 and p33.
    fingerprint_bytes = unhexlify(fingerprint.encode())

cert_digest = hashfunc(cert).digest()

if not _const_compare_digest(cert_digest, fingerprint_bytes):
        raise SSLError('Fingerprints did not match. Expected "{0}", got "{1}".'
                       .format(fingerprint, hexlify(cert_digest)))

def resolve_cert_reqs(candidate):
    """
    Resolves the argument to a numeric constant, which can be passed to
    the wrap_socket function/method from the ssl module.
    Defaults to :data:`ssl.CERT_NONE`.
    If given a string it is assumed to be the name of the constant in the
    :mod:`ssl` module or its abbrevation.
    (So you can specify `REQUIRED` instead of `CERT_REQUIRED`.
    If it's neither `None` nor a string we assume it is already the numeric
    constant which can directly be passed to wrap_socket.
    """
    if candidate is None:
        return CERT_NONE

if isinstance(candidate, str):
        res = getattr(ssl, candidate, None)
        if res is None:
            res = getattr(ssl, 'CERT_' + candidate)
        return res

return candidate

def resolve_ssl_version(candidate):
    """
    like resolve_cert_reqs
    """
    if candidate is None:
        return PROTOCOL_SSLv23

if isinstance(candidate, str):
        res = getattr(ssl, candidate, None)
        if res is None:
            res = getattr(ssl, 'PROTOCOL_' + candidate)
        return res

return candidate

def create_urllib3_context(ssl_version=None, cert_reqs=None,
                           options=None, ciphers=None):
    """All arguments have the same meaning as ``ssl_wrap_socket``.

By default, this function does a lot of the same work that
    ``ssl.create_default_context`` does on Python 3.4+. It:

- Disables SSLv2, SSLv3, and compression
    - Sets a restricted set of server ciphers

If you wish to enable SSLv3, you can do::

from urllib3.util import ssl_
        context = ssl_.create_urllib3_context()
        context.options &= ~ssl_.OP_NO_SSLv3

You can do the same to enable compression (substituting ``COMPRESSION``
    for ``SSLv3`` in the last line above).

:param ssl_version:
        The desired protocol version to use. This will default to
        PROTOCOL_SSLv23 which will negotiate the highest protocol that both
        the server and your installation of OpenSSL support.
    :param cert_reqs:
        Whether to require the certificate verification. This defaults to
        ``ssl.CERT_REQUIRED``.
    :param options:
        Specific OpenSSL options. These default to ``ssl.OP_NO_SSLv2``,
        ``ssl.OP_NO_SSLv3``, ``ssl.OP_NO_COMPRESSION``.
    :param ciphers:
        Which cipher suites to allow the server to select.
    :returns:
        Constructed SSLContext object with specified options
    :rtype: SSLContext
    """
    context = SSLContext(ssl_version or ssl.PROTOCOL_SSLv23)

# Setting the default here, as we may have no ssl module on import
    cert_reqs = ssl.CERT_REQUIRED if cert_reqs is None else cert_reqs

if options is None:
        options = 0
        # SSLv2 is easily broken and is considered harmful and dangerous
        options |= OP_NO_SSLv2
        # SSLv3 has several problems and is now dangerous
        options |= OP_NO_SSLv3
        # Disable compression to prevent CRIME attacks for OpenSSL 1.0+
        # (issue #309)
        options |= OP_NO_COMPRESSION

context.options |= options

if getattr(context, 'supports_set_ciphers', True):  # Platform-specific: Python 2.6
        context.set_ciphers(ciphers or DEFAULT_CIPHERS)

context.verify_mode = cert_reqs
    if getattr(context, 'check_hostname', None) is not None:  # Platform-specific: Python 3.2
        # We do our own verification, including fingerprints and alternative
        # hostnames. So disable it here
        context.check_hostname = False
    return context

def ssl_wrap_socket(sock, keyfile=None, certfile=None, cert_reqs=None,
                    ca_certs=None, server_hostname=None,
                    ssl_version=None, ciphers=None, ssl_context=None,
                    ca_cert_dir=None):
    """
    All arguments except for server_hostname, ssl_context, and ca_cert_dir have
    the same meaning as they do when using :func:`ssl.wrap_socket`.

:param server_hostname:
        When SNI is supported, the expected hostname of the certificate
    :param ssl_context:
        A pre-made :class:`SSLContext` object. If none is provided, one will
        be created using :func:`create_urllib3_context`.
    :param ciphers:
        A string of ciphers we wish the client to support. This is not
        supported on Python 2.6 as the ssl module does not support it.
    :param ca_cert_dir:
        A directory containing CA certificates in multiple separate files, as
        supported by OpenSSL's -CApath flag or the capath argument to
        SSLContext.load_verify_locations().
    """
    context = ssl_context
    if context is None:
        # Note: This branch of code and all the variables in it are no longer
        # used by urllib3 itself. We should consider deprecating and removing
        # this code.
        context = create_urllib3_context(ssl_version, cert_reqs,
                                         ciphers=ciphers)

if ca_certs or ca_cert_dir:
        try:
            context.load_verify_locations(ca_certs, ca_cert_dir)
        except IOError as e:  # Platform-specific: Python 2.6, 2.7, 3.2
            raise SSLError(e)
        # Py33 raises FileNotFoundError which subclasses OSError
        # These are not equivalent unless we check the errno attribute
        except OSError as e:  # Platform-specific: Python 3.3 and beyond
            if e.errno == errno.ENOENT:
                raise SSLError(e)
            raise
    elif ssl_context is None and hasattr(context, 'load_default_certs'):
        # try to load OS default certs; works well on Windows (require Python3.4+)
        context.load_default_certs()

if certfile:
        context.load_cert_chain(certfile, keyfile)
    if HAS_SNI:  # Platform-specific: OpenSSL with enabled SNI
        return context.wrap_socket(sock, server_hostname=server_hostname)

warnings.warn(
        'An HTTPS request has been made, but the SNI (Subject Name '
        'Indication) extension to TLS is not available on this platform. '
        'This may cause the server to present an incorrect TLS '
        'certificate, which can cause validation failures. You can upgrade to '
        'a newer version of Python to solve this. For more information, see '
        'https://urllib3.readthedocs.io/en/latest/advanced-usage.html'
        '#ssl-warnings',
        SNIMissingWarning
    )
    return context.wrap_socket(sock)

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