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See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function from enum import Enum import six from cryptography import utils from cryptography.x509.oid import NameOID, ObjectIdentifier class _ASN1Type(Enum): UTF8String = 12 NumericString = 18 PrintableString = 19 T61String = 20 IA5String = 22 UTCTime = 23 GeneralizedTime = 24 VisibleString = 26 UniversalString = 28 BMPString = 30 _ASN1_TYPE_TO_ENUM = dict((i.value, i) for i in _ASN1Type) _SENTINEL = object() _NAMEOID_DEFAULT_TYPE = { NameOID.COUNTRY_NAME: _ASN1Type.PrintableString, NameOID.JURISDICTION_COUNTRY_NAME: _ASN1Type.PrintableString, NameOID.SERIAL_NUMBER: _ASN1Type.PrintableString, NameOID.DN_QUALIFIER: _ASN1Type.PrintableString, NameOID.EMAIL_ADDRESS: _ASN1Type.IA5String, NameOID.DOMAIN_COMPONENT: _ASN1Type.IA5String, } #: Short attribute names from RFC 4514: #: https://tools.ietf.org/html/rfc4514#page-7 _NAMEOID_TO_NAME = { NameOID.COMMON_NAME: 'CN', NameOID.LOCALITY_NAME: 'L', NameOID.STATE_OR_PROVINCE_NAME: 'ST', NameOID.ORGANIZATION_NAME: 'O', NameOID.ORGANIZATIONAL_UNIT_NAME: 'OU', NameOID.COUNTRY_NAME: 'C', NameOID.STREET_ADDRESS: 'STREET', NameOID.DOMAIN_COMPONENT: 'DC', NameOID.USER_ID: 'UID', } def _escape_dn_value(val): """Escape special characters in RFC4514 Distinguished Name value.""" # See https://tools.ietf.org/html/rfc4514#section-2.4 val = val.replace('\\', '\\\\') val = val.replace('"', '\\"') val = val.replace('+', '\\+') val = val.replace(',', '\\,') val = val.replace(';', '\\;') val = val.replace('<', '\\<') val = val.replace('>', '\\>') val = val.replace('\0', '\\00') if val[0] in ('#', ' '): val = '\\' + val if val[-1] == ' ': val = val[:-1] + '\\ ' return val class NameAttribute(object): def __init__(self, oid, value, _type=_SENTINEL): if not isinstance(oid, ObjectIdentifier): raise TypeError( "oid argument must be an ObjectIdentifier instance." ) if not isinstance(value, six.text_type): raise TypeError( "value argument must be a text type." ) if ( oid == NameOID.COUNTRY_NAME or oid == NameOID.JURISDICTION_COUNTRY_NAME ): if len(value.encode("utf8")) != 2: raise ValueError( "Country name must be a 2 character country code" ) if len(value) == 0: raise ValueError("Value cannot be an empty string") # The appropriate ASN1 string type varies by OID and is defined across # multiple RFCs including 2459, 3280, and 5280. In general UTF8String # is preferred (2459), but 3280 and 5280 specify several OIDs with # alternate types. This means when we see the sentinel value we need # to look up whether the OID has a non-UTF8 type. If it does, set it # to that. Otherwise, UTF8! if _type == _SENTINEL: _type = _NAMEOID_DEFAULT_TYPE.get(oid, _ASN1Type.UTF8String) if not isinstance(_type, _ASN1Type): raise TypeError("_type must be from the _ASN1Type enum") self._oid = oid self._value = value self._type = _type oid = utils.read_only_property("_oid") value = utils.read_only_property("_value") def rfc4514_string(self): """ Format as RFC4514 Distinguished Name string. Use short attribute name if available, otherwise fall back to OID dotted string. """ key = _NAMEOID_TO_NAME.get(self.oid, self.oid.dotted_string) return '%s=%s' % (key, _escape_dn_value(self.value)) def __eq__(self, other): if not isinstance(other, NameAttribute): return NotImplemented return ( self.oid == other.oid and self.value == other.value ) def __ne__(self, other): return not self == other def __hash__(self): return hash((self.oid, self.value)) def __repr__(self): return "".format(self) class RelativeDistinguishedName(object): def __init__(self, attributes): attributes = list(attributes) if not attributes: raise ValueError("a relative distinguished name cannot be empty") if not all(isinstance(x, NameAttribute) for x in attributes): raise TypeError("attributes must be an iterable of NameAttribute") # Keep list and frozenset to preserve attribute order where it matters self._attributes = attributes self._attribute_set = frozenset(attributes) if len(self._attribute_set) != len(attributes): raise ValueError("duplicate attributes are not allowed") def get_attributes_for_oid(self, oid): return [i for i in self if i.oid == oid] def rfc4514_string(self): """ Format as RFC4514 Distinguished Name string. Within each RDN, attributes are joined by '+', although that is rarely used in certificates. """ return '+'.join(attr.rfc4514_string() for attr in self._attributes) def __eq__(self, other): if not isinstance(other, RelativeDistinguishedName): return NotImplemented return self._attribute_set == other._attribute_set def __ne__(self, other): return not self == other def __hash__(self): return hash(self._attribute_set) def __iter__(self): return iter(self._attributes) def __len__(self): return len(self._attributes) def __repr__(self): return "".format(self.rfc4514_string()) class Name(object): def __init__(self, attributes): attributes = list(attributes) if all(isinstance(x, NameAttribute) for x in attributes): self._attributes = [ RelativeDistinguishedName([x]) for x in attributes ] elif all(isinstance(x, RelativeDistinguishedName) for x in attributes): self._attributes = attributes else: raise TypeError( "attributes must be a list of NameAttribute" " or a list RelativeDistinguishedName" ) def rfc4514_string(self): """ Format as RFC4514 Distinguished Name string. For example 'CN=foobar.com,O=Foo Corp,C=US' An X.509 name is a two-level structure: a list of sets of attributes. Each list element is separated by ',' and within each list element, set elements are separated by '+'. The latter is almost never used in real world certificates. """ return ','.join(attr.rfc4514_string() for attr in self._attributes) def get_attributes_for_oid(self, oid): return [i for i in self if i.oid == oid] @property def rdns(self): return self._attributes def public_bytes(self, backend): return backend.x509_name_bytes(self) def __eq__(self, other): if not isinstance(other, Name): return NotImplemented return self._attributes == other._attributes def __ne__(self, other): return not self == other def __hash__(self): # TODO: this is relatively expensive, if this looks like a bottleneck # for you, consider optimizing! return hash(tuple(self._attributes)) def __iter__(self): for rdn in self._attributes: for ava in rdn: yield ava def __len__(self): return sum(len(rdn) for rdn in self._attributes) def __repr__(self): if six.PY2: return "".format(self.rfc4514_string().encode('utf8')) else: return "".format(self.rfc4514_string())