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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 cryptography.x509 import ExtensionNotFound, ObjectIdentifier
__all__ = [
'DeviceMatcher',
'FingerprintMatcher',
'ExtensionMatcher',
'DEFAULT_MATCHERS'
]
class DeviceMatcher(object):
selector_type = None
def matches(self, certificate, parameters=None):
raise NotImplementedError
class FingerprintMatcher(DeviceMatcher):
selector_type = 'fingerprint'
def matches(self, certificate, parameters=[]):
fingerprints = [s.lower() for s in parameters]
return certificate.get_fingerprint('sha1').lower() in fingerprints
def _get_ext_by_oid(cert, oid):
oid = ObjectIdentifier(oid)
try:
extension = cert.extensions.get_extension_for_oid(oid)
return extension.value.value
except ExtensionNotFound:
return None
class ExtensionMatcher(DeviceMatcher):
selector_type = 'x509Extension'
def matches(self, certificate, parameters={}):
key = parameters.get('key')
match_value = parameters.get('value')
extension_value = _get_ext_by_oid(certificate, key)
return extension_value is not None and (
match_value is None or
match_value.encode('utf-8') == extension_value
)
DEFAULT_MATCHERS = [
FingerprintMatcher(),
ExtensionMatcher()
]
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