tests/test_rfc7508.py

#
# This file is part of pyasn1-modules software.
#
# Created by Russ Housley
# Copyright (c) 2019, Vigil Security, LLC
# License: http://snmplabs.com/pyasn1/license.html
#

import sys

from pyasn1.type import univ

from pyasn1.codec.der.decoder import decode as der_decode
from pyasn1.codec.der.encoder import encode as der_encode

from pyasn1_modules import pem
from pyasn1_modules import rfc5652
from pyasn1_modules import rfc7508

try:
    import unittest2 as unittest
except ImportError:
    import unittest


class SignedMessageTestCase(unittest.TestCase):
    signed_message_pem_text = """\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"""

    def setUp(self):
        self.asn1Spec = rfc5652.ContentInfo()

    def testDerCodec(self):
        substrate = pem.readBase64fromText(self.signed_message_pem_text)
        asn1Object, rest = der_decode (substrate, asn1Spec=self.asn1Spec)
        assert not rest
        assert asn1Object.prettyPrint()
        assert der_encode(asn1Object) == substrate

        secure_header_field_attr_found = False
        assert asn1Object['contentType'] == rfc5652.id_signedData
        sd, rest = der_decode (asn1Object['content'], asn1Spec=rfc5652.SignedData())
        for sa in sd['signerInfos'][0]['signedAttrs']:
            sat = sa['attrType']
            sav0 = sa['attrValues'][0]

            if sat == rfc7508.id_aa_secureHeaderFieldsIdentifier:
                assert sat in rfc5652.cmsAttributesMap.keys()
                sav, rest = der_decode(sav0, asn1Spec=rfc5652.cmsAttributesMap[sat])
                assert not rest
                assert sav.prettyPrint()
                assert der_encode(sav) == sav0

                from_field = rfc7508.HeaderFieldName('From')
                alice_email = rfc7508.HeaderFieldValue('alice@example.com')
                for shf in sav['secHeaderFields']:
                    if shf['field-Name'] == from_field:
                        assert shf['field-Value'] == alice_email
                        secure_header_field_attr_found = True

        assert secure_header_field_attr_found

    def testOpenTypes(self):
        substrate = pem.readBase64fromText(self.signed_message_pem_text)
        asn1Object, rest = der_decode(substrate,
            asn1Spec=self.asn1Spec, decodeOpenTypes=True)
        assert not rest
        assert asn1Object.prettyPrint()
        assert der_encode(asn1Object) == substrate

        assert asn1Object['contentType'] in rfc5652.cmsContentTypesMap.keys()
        assert asn1Object['contentType'] == rfc5652.id_signedData

        sd = asn1Object['content']
        assert sd['version'] == rfc5652.CMSVersion().subtype(value='v1')

        ect = sd['encapContentInfo']['eContentType']
        assert ect in rfc5652.cmsContentTypesMap.keys()
        assert ect == rfc5652.id_data

        for sa in sd['signerInfos'][0]['signedAttrs']:
            if sa['attrType'] == rfc7508.id_aa_secureHeaderFieldsIdentifier:
                assert sa['attrType'] in rfc5652.cmsAttributesMap.keys()

                secure_header_field_attr_found = False
                for sa in sd['signerInfos'][0]['signedAttrs']:
                    if sa['attrType'] == rfc7508.id_aa_secureHeaderFieldsIdentifier:
                        assert sa['attrType'] in rfc5652.cmsAttributesMap.keys()
                        from_field = rfc7508.HeaderFieldName('From')
                        alice_email = rfc7508.HeaderFieldValue('alice@example.com')
                        for shf in sa['attrValues'][0]['secHeaderFields']:
                            if shf['field-Name'] == from_field:
                                assert shf['field-Value'] == alice_email
                                secure_header_field_attr_found = True

                assert secure_header_field_attr_found


suite = unittest.TestLoader().loadTestsFromModule(sys.modules[__name__])

if __name__ == '__main__':
    import sys

    result = unittest.TextTestRunner(verbosity=2).run(suite)
    sys.exit(not result.wasSuccessful())