/usr/share/pyshared/authres/dkim_b.py is in python-authres 0.602-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright © 2012-2013 Julian Mehnle <julian@mehnle.net>,
# Copyright © 2012-2013 Scott Kitterman <scott@kitterman.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
authres extension module for RFC 6008 DKIM signature identification (header.b).
"""
#MODULE = 'authres'
__author__ = 'Scott Kitterman, Julian Mehnle'
__email__ = 'scott@kitterman.com'
__version__ = '0.602'
import authres.core
from authres.core import make_result_class_properties
class DKIMAuthenticationResult(authres.core.DKIMAuthenticationResult):
"DKIM result clause of an ``Authentication-Results`` header"
def __init__(self, version = None,
result = None, result_comment = None,
reason = None, reason_comment = None,
properties = None,
header_d = None, header_d_comment = None,
header_i = None, header_i_comment = None,
header_b = None, header_b_comment = None
):
authres.core.DKIMAuthenticationResult.__init__(self, version,
result, result_comment, reason, reason_comment, properties,
header_d, header_d_comment, header_i, header_i_comment)
if header_b: self.header_b = header_b
if header_b_comment: self.header_b_comment = header_b_comment
header_b, header_b_comment = make_result_class_properties('header', 'b')
def match_signature(self, signature_d, signature_b = None, strict = False):
"""Match authentication result against a DKIM signature by ``header.d``
and, if available, ``header.b``, per RFC 6008, section 4
<http://tools.ietf.org/html/rfc6008#section-4>. If ``header.b`` is
absent from the authentication result, a non-strict match succeeds,
whereas a strict match fails."""
if self.header_d != signature_d:
return False
if self.header_b is None:
return not strict
if len(self.header_b) >= 8:
# Require prefix match:
return signature_b.startswith(self.header_b)
else:
# Require exact match:
return self.header_b == signature_b
RESULT_CLASSES = [
DKIMAuthenticationResult
]
# vim:sw=4 sts=4
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