91 lines
2.1 KiB
Python
91 lines
2.1 KiB
Python
|
#
|
||
|
|
# This file is part of pyasn1-modules software.
|
||
|
|
#
|
||
|
|
# Created by Russ Housley with assistance from asn1ate v.0.6.0.
|
||
|
|
#
|
||
|
|
# Copyright (c) 2019, Vigil Security, LLC
|
||
|
|
# License: http://snmplabs.com/pyasn1/license.html
|
||
|
|
#
|
||
|
|
# Securing Header Fields with S/MIME
|
||
|
|
#
|
||
|
|
# ASN.1 source from:
|
||
|
|
# https://www.rfc-editor.org/rfc/rfc7508.txt
|
||
|
|
# https://www.rfc-editor.org/errata/eid5875
|
||
|
|
#
|
||
|
|
|
||
|
|
from pyasn1.type import char
|
||
|
|
from pyasn1.type import constraint
|
||
|
|
from pyasn1.type import namedtype
|
||
|
|
from pyasn1.type import namedval
|
||
|
|
from pyasn1.type import univ
|
||
|
|
|
||
|
|
from pyasn1_modules import rfc5652
|
||
|
|
|
||
|
|
import string
|
||
|
|
|
||
|
|
MAX = float('inf')
|
||
|
|
|
||
|
|
|
||
|
|
class Algorithm(univ.Enumerated):
|
||
|
|
namedValues = namedval.NamedValues(
|
||
|
|
('canonAlgorithmSimple', 0),
|
||
|
|
('canonAlgorithmRelaxed', 1)
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class HeaderFieldStatus(univ.Integer):
|
||
|
|
namedValues = namedval.NamedValues(
|
||
|
|
('duplicated', 0),
|
||
|
|
('deleted', 1),
|
||
|
|
('modified', 2)
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class HeaderFieldName(char.VisibleString):
|
||
|
|
subtypeSpec = (
|
||
|
|
constraint.PermittedAlphabetConstraint(*string.printable) -
|
||
|
|
constraint.PermittedAlphabetConstraint(':')
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class HeaderFieldValue(char.UTF8String):
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
class HeaderField(univ.Sequence):
|
||
|
|
componentType = namedtype.NamedTypes(
|
||
|
|
namedtype.NamedType('field-Name', HeaderFieldName()),
|
||
|
|
namedtype.NamedType('field-Value', HeaderFieldValue()),
|
||
|
|
namedtype.DefaultedNamedType('field-Status',
|
||
|
|
HeaderFieldStatus().subtype(value='duplicated'))
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class HeaderFields(univ.SequenceOf):
|
||
|
|
componentType = HeaderField()
|
||
|
|
subtypeSpec = constraint.ValueSizeConstraint(1, MAX)
|
||
|
|
|
||
|
|
|
||
|
|
class SecureHeaderFields(univ.Set):
|
||
|
|
componentType = namedtype.NamedTypes(
|
||
|
|
namedtype.NamedType('canonAlgorithm', Algorithm()),
|
||
|
|
namedtype.NamedType('secHeaderFields', HeaderFields())
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
id_aa = univ.ObjectIdentifier((1, 2, 840, 113549, 1, 9, 16, 2, ))
|
||
|
|
|
||
|
|
id_aa_secureHeaderFieldsIdentifier = id_aa + (55, )
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
# Map of Attribute Type OIDs to Attributes added to the
|
||
|
|
# ones that are in rfc5652.py
|
||
|
|
|
||
|
|
_cmsAttributesMapUpdate = {
|
||
|
|
id_aa_secureHeaderFieldsIdentifier: SecureHeaderFields(),
|
||
|
|
}
|
||
|
|
|
||
|
|
rfc5652.cmsAttributesMap.update(_cmsAttributesMapUpdate)
|
||
|
|
|