461 lines
14 KiB
Python
461 lines
14 KiB
Python
|
# 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.
|
||
|
|
|
||
|
|
import binascii
|
||
|
|
import re
|
||
|
|
import sys
|
||
|
|
import typing
|
||
|
|
import warnings
|
||
|
|
|
||
|
|
from cryptography import utils
|
||
|
|
from cryptography.hazmat.bindings._rust import x509 as rust_x509
|
||
|
|
from cryptography.x509.oid import NameOID, ObjectIdentifier
|
||
|
|
|
||
|
|
|
||
|
|
class _ASN1Type(utils.Enum):
|
||
|
|
BitString = 3
|
||
|
|
OctetString = 4
|
||
|
|
UTF8String = 12
|
||
|
|
NumericString = 18
|
||
|
|
PrintableString = 19
|
||
|
|
T61String = 20
|
||
|
|
IA5String = 22
|
||
|
|
UTCTime = 23
|
||
|
|
GeneralizedTime = 24
|
||
|
|
VisibleString = 26
|
||
|
|
UniversalString = 28
|
||
|
|
BMPString = 30
|
||
|
|
|
||
|
|
|
||
|
|
_ASN1_TYPE_TO_ENUM = {i.value: i for i in _ASN1Type}
|
||
|
|
_NAMEOID_DEFAULT_TYPE: typing.Dict[ObjectIdentifier, _ASN1Type] = {
|
||
|
|
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,
|
||
|
|
}
|
||
|
|
|
||
|
|
# Type alias
|
||
|
|
_OidNameMap = typing.Mapping[ObjectIdentifier, str]
|
||
|
|
_NameOidMap = typing.Mapping[str, ObjectIdentifier]
|
||
|
|
|
||
|
|
#: Short attribute names from RFC 4514:
|
||
|
|
#: https://tools.ietf.org/html/rfc4514#page-7
|
||
|
|
_NAMEOID_TO_NAME: _OidNameMap = {
|
||
|
|
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",
|
||
|
|
}
|
||
|
|
_NAME_TO_NAMEOID = {v: k for k, v in _NAMEOID_TO_NAME.items()}
|
||
|
|
|
||
|
|
|
||
|
|
def _escape_dn_value(val: typing.Union[str, bytes]) -> str:
|
||
|
|
"""Escape special characters in RFC4514 Distinguished Name value."""
|
||
|
|
|
||
|
|
if not val:
|
||
|
|
return ""
|
||
|
|
|
||
|
|
# RFC 4514 Section 2.4 defines the value as being the # (U+0023) character
|
||
|
|
# followed by the hexadecimal encoding of the octets.
|
||
|
|
if isinstance(val, bytes):
|
||
|
|
return "#" + binascii.hexlify(val).decode("utf8")
|
||
|
|
|
||
|
|
# 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
|
||
|
|
|
||
|
|
|
||
|
|
def _unescape_dn_value(val: str) -> str:
|
||
|
|
if not val:
|
||
|
|
return ""
|
||
|
|
|
||
|
|
# See https://tools.ietf.org/html/rfc4514#section-3
|
||
|
|
|
||
|
|
# special = escaped / SPACE / SHARP / EQUALS
|
||
|
|
# escaped = DQUOTE / PLUS / COMMA / SEMI / LANGLE / RANGLE
|
||
|
|
def sub(m):
|
||
|
|
val = m.group(1)
|
||
|
|
# Regular escape
|
||
|
|
if len(val) == 1:
|
||
|
|
return val
|
||
|
|
# Hex-value scape
|
||
|
|
return chr(int(val, 16))
|
||
|
|
|
||
|
|
return _RFC4514NameParser._PAIR_RE.sub(sub, val)
|
||
|
|
|
||
|
|
|
||
|
|
class NameAttribute:
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
oid: ObjectIdentifier,
|
||
|
|
value: typing.Union[str, bytes],
|
||
|
|
_type: typing.Optional[_ASN1Type] = None,
|
||
|
|
*,
|
||
|
|
_validate: bool = True,
|
||
|
|
) -> None:
|
||
|
|
if not isinstance(oid, ObjectIdentifier):
|
||
|
|
raise TypeError(
|
||
|
|
"oid argument must be an ObjectIdentifier instance."
|
||
|
|
)
|
||
|
|
if _type == _ASN1Type.BitString:
|
||
|
|
if oid != NameOID.X500_UNIQUE_IDENTIFIER:
|
||
|
|
raise TypeError(
|
||
|
|
"oid must be X500_UNIQUE_IDENTIFIER for BitString type."
|
||
|
|
)
|
||
|
|
if not isinstance(value, bytes):
|
||
|
|
raise TypeError("value must be bytes for BitString")
|
||
|
|
else:
|
||
|
|
if not isinstance(value, str):
|
||
|
|
raise TypeError("value argument must be a str")
|
||
|
|
|
||
|
|
if (
|
||
|
|
oid == NameOID.COUNTRY_NAME
|
||
|
|
or oid == NameOID.JURISDICTION_COUNTRY_NAME
|
||
|
|
):
|
||
|
|
assert isinstance(value, str)
|
||
|
|
c_len = len(value.encode("utf8"))
|
||
|
|
if c_len != 2 and _validate is True:
|
||
|
|
raise ValueError(
|
||
|
|
"Country name must be a 2 character country code"
|
||
|
|
)
|
||
|
|
elif c_len != 2:
|
||
|
|
warnings.warn(
|
||
|
|
"Country names should be two characters, but the "
|
||
|
|
"attribute is {} characters in length.".format(c_len),
|
||
|
|
stacklevel=2,
|
||
|
|
)
|
||
|
|
|
||
|
|
# 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 is None:
|
||
|
|
_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
|
||
|
|
|
||
|
|
@property
|
||
|
|
def oid(self) -> ObjectIdentifier:
|
||
|
|
return self._oid
|
||
|
|
|
||
|
|
@property
|
||
|
|
def value(self) -> typing.Union[str, bytes]:
|
||
|
|
return self._value
|
||
|
|
|
||
|
|
@property
|
||
|
|
def rfc4514_attribute_name(self) -> str:
|
||
|
|
"""
|
||
|
|
The short attribute name (for example "CN") if available,
|
||
|
|
otherwise the OID dotted string.
|
||
|
|
"""
|
||
|
|
return _NAMEOID_TO_NAME.get(self.oid, self.oid.dotted_string)
|
||
|
|
|
||
|
|
def rfc4514_string(
|
||
|
|
self, attr_name_overrides: typing.Optional[_OidNameMap] = None
|
||
|
|
) -> str:
|
||
|
|
"""
|
||
|
|
Format as RFC4514 Distinguished Name string.
|
||
|
|
|
||
|
|
Use short attribute name if available, otherwise fall back to OID
|
||
|
|
dotted string.
|
||
|
|
"""
|
||
|
|
attr_name = (
|
||
|
|
attr_name_overrides.get(self.oid) if attr_name_overrides else None
|
||
|
|
)
|
||
|
|
if attr_name is None:
|
||
|
|
attr_name = self.rfc4514_attribute_name
|
||
|
|
|
||
|
|
return f"{attr_name}={_escape_dn_value(self.value)}"
|
||
|
|
|
||
|
|
def __eq__(self, other: object) -> bool:
|
||
|
|
if not isinstance(other, NameAttribute):
|
||
|
|
return NotImplemented
|
||
|
|
|
||
|
|
return self.oid == other.oid and self.value == other.value
|
||
|
|
|
||
|
|
def __hash__(self) -> int:
|
||
|
|
return hash((self.oid, self.value))
|
||
|
|
|
||
|
|
def __repr__(self) -> str:
|
||
|
|
return "<NameAttribute(oid={0.oid}, value={0.value!r})>".format(self)
|
||
|
|
|
||
|
|
|
||
|
|
class RelativeDistinguishedName:
|
||
|
|
def __init__(self, attributes: typing.Iterable[NameAttribute]):
|
||
|
|
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: ObjectIdentifier
|
||
|
|
) -> typing.List[NameAttribute]:
|
||
|
|
return [i for i in self if i.oid == oid]
|
||
|
|
|
||
|
|
def rfc4514_string(
|
||
|
|
self, attr_name_overrides: typing.Optional[_OidNameMap] = None
|
||
|
|
) -> str:
|
||
|
|
"""
|
||
|
|
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(attr_name_overrides)
|
||
|
|
for attr in self._attributes
|
||
|
|
)
|
||
|
|
|
||
|
|
def __eq__(self, other: object) -> bool:
|
||
|
|
if not isinstance(other, RelativeDistinguishedName):
|
||
|
|
return NotImplemented
|
||
|
|
|
||
|
|
return self._attribute_set == other._attribute_set
|
||
|
|
|
||
|
|
def __hash__(self) -> int:
|
||
|
|
return hash(self._attribute_set)
|
||
|
|
|
||
|
|
def __iter__(self) -> typing.Iterator[NameAttribute]:
|
||
|
|
return iter(self._attributes)
|
||
|
|
|
||
|
|
def __len__(self) -> int:
|
||
|
|
return len(self._attributes)
|
||
|
|
|
||
|
|
def __repr__(self) -> str:
|
||
|
|
return "<RelativeDistinguishedName({})>".format(self.rfc4514_string())
|
||
|
|
|
||
|
|
|
||
|
|
class Name:
|
||
|
|
@typing.overload
|
||
|
|
def __init__(self, attributes: typing.Iterable[NameAttribute]) -> None:
|
||
|
|
...
|
||
|
|
|
||
|
|
@typing.overload
|
||
|
|
def __init__(
|
||
|
|
self, attributes: typing.Iterable[RelativeDistinguishedName]
|
||
|
|
) -> None:
|
||
|
|
...
|
||
|
|
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
attributes: typing.Iterable[
|
||
|
|
typing.Union[NameAttribute, RelativeDistinguishedName]
|
||
|
|
],
|
||
|
|
) -> None:
|
||
|
|
attributes = list(attributes)
|
||
|
|
if all(isinstance(x, NameAttribute) for x in attributes):
|
||
|
|
self._attributes = [
|
||
|
|
RelativeDistinguishedName([typing.cast(NameAttribute, x)])
|
||
|
|
for x in attributes
|
||
|
|
]
|
||
|
|
elif all(isinstance(x, RelativeDistinguishedName) for x in attributes):
|
||
|
|
self._attributes = typing.cast(
|
||
|
|
typing.List[RelativeDistinguishedName], attributes
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
raise TypeError(
|
||
|
|
"attributes must be a list of NameAttribute"
|
||
|
|
" or a list RelativeDistinguishedName"
|
||
|
|
)
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def from_rfc4514_string(
|
||
|
|
cls,
|
||
|
|
data: str,
|
||
|
|
attr_name_overrides: typing.Optional[_NameOidMap] = None,
|
||
|
|
) -> "Name":
|
||
|
|
return _RFC4514NameParser(data, attr_name_overrides or {}).parse()
|
||
|
|
|
||
|
|
def rfc4514_string(
|
||
|
|
self, attr_name_overrides: typing.Optional[_OidNameMap] = None
|
||
|
|
) -> str:
|
||
|
|
"""
|
||
|
|
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. According to RFC4514 section 2.1 the
|
||
|
|
RDNSequence must be reversed when converting to string representation.
|
||
|
|
"""
|
||
|
|
return ",".join(
|
||
|
|
attr.rfc4514_string(attr_name_overrides)
|
||
|
|
for attr in reversed(self._attributes)
|
||
|
|
)
|
||
|
|
|
||
|
|
def get_attributes_for_oid(
|
||
|
|
self, oid: ObjectIdentifier
|
||
|
|
) -> typing.List[NameAttribute]:
|
||
|
|
return [i for i in self if i.oid == oid]
|
||
|
|
|
||
|
|
@property
|
||
|
|
def rdns(self) -> typing.List[RelativeDistinguishedName]:
|
||
|
|
return self._attributes
|
||
|
|
|
||
|
|
def public_bytes(self, backend: typing.Any = None) -> bytes:
|
||
|
|
return rust_x509.encode_name_bytes(self)
|
||
|
|
|
||
|
|
def __eq__(self, other: object) -> bool:
|
||
|
|
if not isinstance(other, Name):
|
||
|
|
return NotImplemented
|
||
|
|
|
||
|
|
return self._attributes == other._attributes
|
||
|
|
|
||
|
|
def __hash__(self) -> int:
|
||
|
|
# TODO: this is relatively expensive, if this looks like a bottleneck
|
||
|
|
# for you, consider optimizing!
|
||
|
|
return hash(tuple(self._attributes))
|
||
|
|
|
||
|
|
def __iter__(self) -> typing.Iterator[NameAttribute]:
|
||
|
|
for rdn in self._attributes:
|
||
|
|
for ava in rdn:
|
||
|
|
yield ava
|
||
|
|
|
||
|
|
def __len__(self) -> int:
|
||
|
|
return sum(len(rdn) for rdn in self._attributes)
|
||
|
|
|
||
|
|
def __repr__(self) -> str:
|
||
|
|
rdns = ",".join(attr.rfc4514_string() for attr in self._attributes)
|
||
|
|
return "<Name({})>".format(rdns)
|
||
|
|
|
||
|
|
|
||
|
|
class _RFC4514NameParser:
|
||
|
|
_OID_RE = re.compile(r"(0|([1-9]\d*))(\.(0|([1-9]\d*)))+")
|
||
|
|
_DESCR_RE = re.compile(r"[a-zA-Z][a-zA-Z\d-]*")
|
||
|
|
|
||
|
|
_PAIR = r"\\([\\ #=\"\+,;<>]|[\da-zA-Z]{2})"
|
||
|
|
_PAIR_RE = re.compile(_PAIR)
|
||
|
|
_LUTF1 = r"[\x01-\x1f\x21\x24-\x2A\x2D-\x3A\x3D\x3F-\x5B\x5D-\x7F]"
|
||
|
|
_SUTF1 = r"[\x01-\x21\x23-\x2A\x2D-\x3A\x3D\x3F-\x5B\x5D-\x7F]"
|
||
|
|
_TUTF1 = r"[\x01-\x1F\x21\x23-\x2A\x2D-\x3A\x3D\x3F-\x5B\x5D-\x7F]"
|
||
|
|
_UTFMB = rf"[\x80-{chr(sys.maxunicode)}]"
|
||
|
|
_LEADCHAR = rf"{_LUTF1}|{_UTFMB}"
|
||
|
|
_STRINGCHAR = rf"{_SUTF1}|{_UTFMB}"
|
||
|
|
_TRAILCHAR = rf"{_TUTF1}|{_UTFMB}"
|
||
|
|
_STRING_RE = re.compile(
|
||
|
|
rf"""
|
||
|
|
(
|
||
|
|
({_LEADCHAR}|{_PAIR})
|
||
|
|
(
|
||
|
|
({_STRINGCHAR}|{_PAIR})*
|
||
|
|
({_TRAILCHAR}|{_PAIR})
|
||
|
|
)?
|
||
|
|
)?
|
||
|
|
""",
|
||
|
|
re.VERBOSE,
|
||
|
|
)
|
||
|
|
_HEXSTRING_RE = re.compile(r"#([\da-zA-Z]{2})+")
|
||
|
|
|
||
|
|
def __init__(self, data: str, attr_name_overrides: _NameOidMap) -> None:
|
||
|
|
self._data = data
|
||
|
|
self._idx = 0
|
||
|
|
|
||
|
|
self._attr_name_overrides = attr_name_overrides
|
||
|
|
|
||
|
|
def _has_data(self) -> bool:
|
||
|
|
return self._idx < len(self._data)
|
||
|
|
|
||
|
|
def _peek(self) -> typing.Optional[str]:
|
||
|
|
if self._has_data():
|
||
|
|
return self._data[self._idx]
|
||
|
|
return None
|
||
|
|
|
||
|
|
def _read_char(self, ch: str) -> None:
|
||
|
|
if self._peek() != ch:
|
||
|
|
raise ValueError
|
||
|
|
self._idx += 1
|
||
|
|
|
||
|
|
def _read_re(self, pat) -> str:
|
||
|
|
match = pat.match(self._data, pos=self._idx)
|
||
|
|
if match is None:
|
||
|
|
raise ValueError
|
||
|
|
val = match.group()
|
||
|
|
self._idx += len(val)
|
||
|
|
return val
|
||
|
|
|
||
|
|
def parse(self) -> Name:
|
||
|
|
"""
|
||
|
|
Parses the `data` string and converts it to a Name.
|
||
|
|
|
||
|
|
According to RFC4514 section 2.1 the RDNSequence must be
|
||
|
|
reversed when converting to string representation. So, when
|
||
|
|
we parse it, we need to reverse again to get the RDNs on the
|
||
|
|
correct order.
|
||
|
|
"""
|
||
|
|
rdns = [self._parse_rdn()]
|
||
|
|
|
||
|
|
while self._has_data():
|
||
|
|
self._read_char(",")
|
||
|
|
rdns.append(self._parse_rdn())
|
||
|
|
|
||
|
|
return Name(reversed(rdns))
|
||
|
|
|
||
|
|
def _parse_rdn(self) -> RelativeDistinguishedName:
|
||
|
|
nas = [self._parse_na()]
|
||
|
|
while self._peek() == "+":
|
||
|
|
self._read_char("+")
|
||
|
|
nas.append(self._parse_na())
|
||
|
|
|
||
|
|
return RelativeDistinguishedName(nas)
|
||
|
|
|
||
|
|
def _parse_na(self) -> NameAttribute:
|
||
|
|
try:
|
||
|
|
oid_value = self._read_re(self._OID_RE)
|
||
|
|
except ValueError:
|
||
|
|
name = self._read_re(self._DESCR_RE)
|
||
|
|
oid = self._attr_name_overrides.get(
|
||
|
|
name, _NAME_TO_NAMEOID.get(name)
|
||
|
|
)
|
||
|
|
if oid is None:
|
||
|
|
raise ValueError
|
||
|
|
else:
|
||
|
|
oid = ObjectIdentifier(oid_value)
|
||
|
|
|
||
|
|
self._read_char("=")
|
||
|
|
if self._peek() == "#":
|
||
|
|
value = self._read_re(self._HEXSTRING_RE)
|
||
|
|
value = binascii.unhexlify(value[1:]).decode()
|
||
|
|
else:
|
||
|
|
raw_value = self._read_re(self._STRING_RE)
|
||
|
|
value = _unescape_dn_value(raw_value)
|
||
|
|
|
||
|
|
return NameAttribute(oid, value)
|