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# Copyright (c) 2013 Yubico AB
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or
# without modification, are permitted provided that the following
# conditions are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
from u2flib_server.attestation.model import DeviceInfo, Attestation
from u2flib_server.attestation.matchers import DEFAULT_MATCHERS
from u2flib_server.attestation.resolvers import create_resolver
from u2flib_server.model import Transport
from cryptography import x509
from cryptography.hazmat.backends import default_backend
__all__ = ['MetadataProvider']
class MetadataProvider(object):
def __init__(self, resolver=None, matchers=DEFAULT_MATCHERS):
if resolver is None:
resolver = create_resolver()
self._resolver = resolver
self._matchers = {}
for matcher in matchers:
self.add_matcher(matcher)
def add_matcher(self, matcher):
self._matchers[matcher.selector_type] = matcher
def get_attestation(self, cert):
if isinstance(cert, bytes):
cert = x509.load_der_x509_certificate(cert, default_backend())
metadata = self._resolver.resolve(cert)
if metadata is not None:
trusted = True
vendor_info = metadata.vendorInfo
device_info = self._lookup_device(metadata, cert)
else:
trusted = False
vendor_info = None
device_info = DeviceInfo()
cert_transports = Transport.transports_from_cert(cert)
return Attestation(trusted, vendor_info, device_info, cert_transports)
def _lookup_device(self, metadata, cert):
for device in metadata.devices:
selectors = device.selectors
if selectors is None:
return device
for selector in selectors:
matcher = self._matchers.get(selector.type)
if matcher and matcher.matches(cert, selector.parameters):
return device
return DeviceInfo()
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