| .. | |||||
| __pycache__ | |||||
| __init__.py | |||||
| base.py | |||||
| certificate_transparency.py | |||||
| extensions.py | |||||
| general_name.py | |||||
| name.py | |||||
| ocsp.py | |||||
| oid.py |
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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. 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 "<NameAttribute(oid={0.oid}, value={0.value!r})>".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 "<RelativeDistinguishedName({})>".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):
return "<Name({})>".format(self.rfc4514_string())
| .. | |||||
| __pycache__ | |||||
| __init__.py | |||||
| base.py | |||||
| certificate_transparency.py | |||||
| extensions.py | |||||
| general_name.py | |||||
| name.py | |||||
| ocsp.py | |||||
| oid.py |