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Editing: subj_alt_name.py
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"""NDG HTTPS Client package Use pyasn1 to provide support for parsing ASN.1 formatted subjectAltName content for SSL peer verification. Code based on: http://stackoverflow.com/questions/5519958/how-do-i-parse-subjectaltname-extension-data-using-pyasn1 """ __author__ = "P J Kershaw" __date__ = "01/02/12" __copyright__ = "(C) 2012 Science and Technology Facilities Council" __license__ = "BSD - see LICENSE file in top-level directory" __contact__ = "Philip.Kershaw@stfc.ac.uk" __revision__ = '$Id$' try: from pyasn1.type import univ, constraint, char, namedtype, tag except ImportError as e: import_error_msg = ('Error importing pyasn1, subjectAltName check for SSL ' 'peer verification will be disabled. Import error ' 'is: %s' % e) import warnings warnings.warn(import_error_msg) class Pyasn1ImportError(ImportError): "Raise for pyasn1 import error" raise Pyasn1ImportError(import_error_msg) MAX = 64 class DirectoryString(univ.Choice): """ASN.1 Directory string class""" componentType = namedtype.NamedTypes( namedtype.NamedType( 'teletexString', char.TeletexString().subtype( subtypeSpec=constraint.ValueSizeConstraint(1, MAX))), namedtype.NamedType( 'printableString', char.PrintableString().subtype( subtypeSpec=constraint.ValueSizeConstraint(1, MAX))), namedtype.NamedType( 'universalString', char.UniversalString().subtype( subtypeSpec=constraint.ValueSizeConstraint(1, MAX))), namedtype.NamedType( 'utf8String', char.UTF8String().subtype( subtypeSpec=constraint.ValueSizeConstraint(1, MAX))), namedtype.NamedType( 'bmpString', char.BMPString().subtype( subtypeSpec=constraint.ValueSizeConstraint(1, MAX))), namedtype.NamedType( 'ia5String', char.IA5String().subtype( subtypeSpec=constraint.ValueSizeConstraint(1, MAX))), ) class AttributeValue(DirectoryString): """ASN.1 Attribute value""" class AttributeType(univ.ObjectIdentifier): """ASN.1 Attribute type""" class AttributeTypeAndValue(univ.Sequence): """ASN.1 Attribute type and value class""" componentType = namedtype.NamedTypes( namedtype.NamedType('type', AttributeType()), namedtype.NamedType('value', AttributeValue()), ) class RelativeDistinguishedName(univ.SetOf): '''ASN.1 Realtive distinguished name''' componentType = AttributeTypeAndValue() class RDNSequence(univ.SequenceOf): '''ASN.1 RDN sequence class''' componentType = RelativeDistinguishedName() class Name(univ.Choice): '''ASN.1 name class''' componentType = namedtype.NamedTypes( namedtype.NamedType('', RDNSequence()), ) class Extension(univ.Sequence): '''ASN.1 extension class''' componentType = namedtype.NamedTypes( namedtype.NamedType('extnID', univ.ObjectIdentifier()), namedtype.DefaultedNamedType('critical', univ.Boolean('False')), namedtype.NamedType('extnValue', univ.OctetString()), ) class Extensions(univ.SequenceOf): '''ASN.1 extensions class''' componentType = Extension() sizeSpec = univ.SequenceOf.sizeSpec + constraint.ValueSizeConstraint(1, MAX) class AnotherName(univ.Sequence): componentType = namedtype.NamedTypes( namedtype.NamedType('type-id', univ.ObjectIdentifier()), namedtype.NamedType('value', univ.Any().subtype( explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0))) ) class GeneralName(univ.Choice): '''ASN.1 configuration for X.509 certificate subjectAltNames fields''' componentType = namedtype.NamedTypes( namedtype.NamedType('otherName', AnotherName().subtype( implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0))), namedtype.NamedType('rfc822Name', char.IA5String().subtype( implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 1))), namedtype.NamedType('dNSName', char.IA5String().subtype( implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 2))), # namedtype.NamedType('x400Address', ORAddress().subtype( # implicitTag=tag.Tag(tag.tagClassContext, # tag.tagFormatSimple, 3))), namedtype.NamedType('directoryName', Name().subtype( implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 4))), # namedtype.NamedType('ediPartyName', EDIPartyName().subtype( # implicitTag=tag.Tag(tag.tagClassContext, # tag.tagFormatSimple, 5))), namedtype.NamedType('uniformResourceIdentifier', char.IA5String().subtype( implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 6))), namedtype.NamedType('iPAddress', univ.OctetString().subtype( implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 7))), namedtype.NamedType('registeredID', univ.ObjectIdentifier().subtype( implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 8))), ) class GeneralNames(univ.SequenceOf): '''Sequence of names for ASN.1 subjectAltNames settings''' componentType = GeneralName() sizeSpec = univ.SequenceOf.sizeSpec + constraint.ValueSizeConstraint(1, MAX) class SubjectAltName(GeneralNames): '''ASN.1 implementation for subjectAltNames support'''