Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/cryptography/x509/name.py: 39%

1# This file is dual licensed under the terms of the Apache License, Version 

2# 2.0, and the BSD License. See the LICENSE file in the root of this repository 

3# for complete details. 

4 

5from __future__ import annotations 

6 

7import binascii 

8import re 

9import sys 

10import typing 

11import warnings 

12from collections.abc import Iterable, Iterator 

13 

14from cryptography import utils 

15from cryptography.hazmat.bindings._rust import x509 as rust_x509 

16from cryptography.x509.oid import NameOID, ObjectIdentifier 

17 

18 

19class _ASN1Type(utils.Enum): 

20 BitString = 3 

21 OctetString = 4 

22 UTF8String = 12 

23 NumericString = 18 

24 PrintableString = 19 

25 T61String = 20 

26 IA5String = 22 

27 UTCTime = 23 

28 GeneralizedTime = 24 

29 VisibleString = 26 

30 UniversalString = 28 

31 BMPString = 30 

32 

33 

34_ASN1_TYPE_TO_ENUM = {i.value: i for i in _ASN1Type} 

35_NAMEOID_DEFAULT_TYPE: dict[ObjectIdentifier, _ASN1Type] = { 

36 NameOID.COUNTRY_NAME: _ASN1Type.PrintableString, 

37 NameOID.JURISDICTION_COUNTRY_NAME: _ASN1Type.PrintableString, 

38 NameOID.SERIAL_NUMBER: _ASN1Type.PrintableString, 

39 NameOID.DN_QUALIFIER: _ASN1Type.PrintableString, 

40 NameOID.EMAIL_ADDRESS: _ASN1Type.IA5String, 

41 NameOID.DOMAIN_COMPONENT: _ASN1Type.IA5String, 

42} 

43 

44# Type alias 

45_OidNameMap = typing.Mapping[ObjectIdentifier, str] 

46_NameOidMap = typing.Mapping[str, ObjectIdentifier] 

47 

48#: Short attribute names from RFC 4514: 

49#: https://tools.ietf.org/html/rfc4514#page-7 

50_NAMEOID_TO_NAME: _OidNameMap = { 

51 NameOID.COMMON_NAME: "CN", 

52 NameOID.LOCALITY_NAME: "L", 

53 NameOID.STATE_OR_PROVINCE_NAME: "ST", 

54 NameOID.ORGANIZATION_NAME: "O", 

55 NameOID.ORGANIZATIONAL_UNIT_NAME: "OU", 

56 NameOID.COUNTRY_NAME: "C", 

57 NameOID.STREET_ADDRESS: "STREET", 

58 NameOID.DOMAIN_COMPONENT: "DC", 

59 NameOID.USER_ID: "UID", 

60} 

61_NAME_TO_NAMEOID = {v: k for k, v in _NAMEOID_TO_NAME.items()} 

62 

63_NAMEOID_LENGTH_LIMIT = { 

64 NameOID.COUNTRY_NAME: (2, 2), 

65 NameOID.JURISDICTION_COUNTRY_NAME: (2, 2), 

66 NameOID.COMMON_NAME: (1, 64), 

67} 

68 

69 

70def _escape_dn_value(val: str | bytes) -> str: 

71 """Escape special characters in RFC4514 Distinguished Name value.""" 

72 

73 if not val: 

74 return "" 

75 

76 # RFC 4514 Section 2.4 defines the value as being the # (U+0023) character 

77 # followed by the hexadecimal encoding of the octets. 

78 if isinstance(val, bytes): 

79 return "#" + binascii.hexlify(val).decode("utf8") 

80 

81 # See https://tools.ietf.org/html/rfc4514#section-2.4 

82 val = val.replace("\\", "\\\\") 

83 val = val.replace('"', '\\"') 

84 val = val.replace("+", "\\+") 

85 val = val.replace(",", "\\,") 

86 val = val.replace(";", "\\;") 

87 val = val.replace("<", "\\<") 

88 val = val.replace(">", "\\>") 

89 val = val.replace("\0", "\\00") 

90 

91 if val[0] in ("#", " "): 

92 val = "\\" + val 

93 if val[-1] == " ": 

94 val = val[:-1] + "\\ " 

95 

96 return val 

97 

98 

99def _unescape_dn_value(val: str) -> str: 

100 if not val: 

101 return "" 

102 

103 # See https://tools.ietf.org/html/rfc4514#section-3 

104 

105 # special = escaped / SPACE / SHARP / EQUALS 

106 # escaped = DQUOTE / PLUS / COMMA / SEMI / LANGLE / RANGLE 

107 def sub(m): 

108 val = m.group(1) 

109 # Regular escape 

110 if len(val) == 1: 

111 return val 

112 # Hex-value scape 

113 return chr(int(val, 16)) 

114 

115 return _RFC4514NameParser._PAIR_RE.sub(sub, val) 

116 

117 

118NameAttributeValueType = typing.TypeVar( 

119 "NameAttributeValueType", 

120 typing.Union[str, bytes], 

121 str, 

122 bytes, 

123 covariant=True, 

124) 

125 

126 

127class NameAttribute(typing.Generic[NameAttributeValueType]): 

128 def __init__( 

129 self, 

130 oid: ObjectIdentifier, 

131 value: NameAttributeValueType, 

132 _type: _ASN1Type | None = None, 

133 *, 

134 _validate: bool = True, 

135 ) -> None: 

136 if not isinstance(oid, ObjectIdentifier): 

137 raise TypeError( 

138 "oid argument must be an ObjectIdentifier instance." 

139 ) 

140 if _type == _ASN1Type.BitString: 

141 if oid != NameOID.X500_UNIQUE_IDENTIFIER: 

142 raise TypeError( 

143 "oid must be X500_UNIQUE_IDENTIFIER for BitString type." 

144 ) 

145 if not isinstance(value, bytes): 

146 raise TypeError("value must be bytes for BitString") 

147 elif not isinstance(value, str): 

148 raise TypeError("value argument must be a str") 

149 

150 length_limits = _NAMEOID_LENGTH_LIMIT.get(oid) 

151 if length_limits is not None: 

152 min_length, max_length = length_limits 

153 assert isinstance(value, str) 

154 c_len = len(value.encode("utf8")) 

155 if c_len < min_length or c_len > max_length: 

156 msg = ( 

157 f"Attribute's length must be >= {min_length} and " 

158 f"<= {max_length}, but it was {c_len}" 

159 ) 

160 if _validate is True: 

161 raise ValueError(msg) 

162 else: 

163 warnings.warn(msg, stacklevel=2) 

164 

165 # The appropriate ASN1 string type varies by OID and is defined across 

166 # multiple RFCs including 2459, 3280, and 5280. In general UTF8String 

167 # is preferred (2459), but 3280 and 5280 specify several OIDs with 

168 # alternate types. This means when we see the sentinel value we need 

169 # to look up whether the OID has a non-UTF8 type. If it does, set it 

170 # to that. Otherwise, UTF8! 

171 if _type is None: 

172 _type = _NAMEOID_DEFAULT_TYPE.get(oid, _ASN1Type.UTF8String) 

173 

174 if not isinstance(_type, _ASN1Type): 

175 raise TypeError("_type must be from the _ASN1Type enum") 

176 

177 self._oid = oid 

178 self._value: NameAttributeValueType = value 

179 self._type: _ASN1Type = _type 

180 

181 @property 

182 def oid(self) -> ObjectIdentifier: 

183 return self._oid 

184 

185 @property 

186 def value(self) -> NameAttributeValueType: 

187 return self._value 

188 

189 @property 

190 def rfc4514_attribute_name(self) -> str: 

191 """ 

192 The short attribute name (for example "CN") if available, 

193 otherwise the OID dotted string. 

194 """ 

195 return _NAMEOID_TO_NAME.get(self.oid, self.oid.dotted_string) 

196 

197 def rfc4514_string( 

198 self, attr_name_overrides: _OidNameMap | None = None 

199 ) -> str: 

200 """ 

201 Format as RFC4514 Distinguished Name string. 

202 

203 Use short attribute name if available, otherwise fall back to OID 

204 dotted string. 

205 """ 

206 attr_name = ( 

207 attr_name_overrides.get(self.oid) if attr_name_overrides else None 

208 ) 

209 if attr_name is None: 

210 attr_name = self.rfc4514_attribute_name 

211 

212 return f"{attr_name}={_escape_dn_value(self.value)}" 

213 

214 def __eq__(self, other: object) -> bool: 

215 if not isinstance(other, NameAttribute): 

216 return NotImplemented 

217 

218 return self.oid == other.oid and self.value == other.value 

219 

220 def __hash__(self) -> int: 

221 return hash((self.oid, self.value)) 

222 

223 def __repr__(self) -> str: 

224 return f"<NameAttribute(oid={self.oid}, value={self.value!r})>" 

225 

226 

227class RelativeDistinguishedName: 

228 def __init__(self, attributes: Iterable[NameAttribute]): 

229 attributes = list(attributes) 

230 if not attributes: 

231 raise ValueError("a relative distinguished name cannot be empty") 

232 if not all(isinstance(x, NameAttribute) for x in attributes): 

233 raise TypeError("attributes must be an iterable of NameAttribute") 

234 

235 # Keep list and frozenset to preserve attribute order where it matters 

236 self._attributes = attributes 

237 self._attribute_set = frozenset(attributes) 

238 

239 if len(self._attribute_set) != len(attributes): 

240 raise ValueError("duplicate attributes are not allowed") 

241 

242 def get_attributes_for_oid( 

243 self, 

244 oid: ObjectIdentifier, 

245 ) -> list[NameAttribute[str | bytes]]: 

246 return [i for i in self if i.oid == oid] 

247 

248 def rfc4514_string( 

249 self, attr_name_overrides: _OidNameMap | None = None 

250 ) -> str: 

251 """ 

252 Format as RFC4514 Distinguished Name string. 

253 

254 Within each RDN, attributes are joined by '+', although that is rarely 

255 used in certificates. 

256 """ 

257 return "+".join( 

258 attr.rfc4514_string(attr_name_overrides) 

259 for attr in self._attributes 

260 ) 

261 

262 def __eq__(self, other: object) -> bool: 

263 if not isinstance(other, RelativeDistinguishedName): 

264 return NotImplemented 

265 

266 return self._attribute_set == other._attribute_set 

267 

268 def __hash__(self) -> int: 

269 return hash(self._attribute_set) 

270 

271 def __iter__(self) -> Iterator[NameAttribute]: 

272 return iter(self._attributes) 

273 

274 def __len__(self) -> int: 

275 return len(self._attributes) 

276 

277 def __repr__(self) -> str: 

278 return f"<RelativeDistinguishedName({self.rfc4514_string()})>" 

279 

280 

281class Name: 

282 @typing.overload 

283 def __init__(self, attributes: Iterable[NameAttribute]) -> None: ... 

284 

285 @typing.overload 

286 def __init__( 

287 self, attributes: Iterable[RelativeDistinguishedName] 

288 ) -> None: ... 

289 

290 def __init__( 

291 self, 

292 attributes: Iterable[NameAttribute | RelativeDistinguishedName], 

293 ) -> None: 

294 attributes = list(attributes) 

295 if all(isinstance(x, NameAttribute) for x in attributes): 

296 self._attributes = [ 

297 RelativeDistinguishedName([typing.cast(NameAttribute, x)]) 

298 for x in attributes 

299 ] 

300 elif all(isinstance(x, RelativeDistinguishedName) for x in attributes): 

301 self._attributes = typing.cast( 

302 typing.List[RelativeDistinguishedName], attributes 

303 ) 

304 else: 

305 raise TypeError( 

306 "attributes must be a list of NameAttribute" 

307 " or a list RelativeDistinguishedName" 

308 ) 

309 

310 @classmethod 

311 def from_rfc4514_string( 

312 cls, 

313 data: str, 

314 attr_name_overrides: _NameOidMap | None = None, 

315 ) -> Name: 

316 return _RFC4514NameParser(data, attr_name_overrides or {}).parse() 

317 

318 def rfc4514_string( 

319 self, attr_name_overrides: _OidNameMap | None = None 

320 ) -> str: 

321 """ 

322 Format as RFC4514 Distinguished Name string. 

323 For example 'CN=foobar.com,O=Foo Corp,C=US' 

324 

325 An X.509 name is a two-level structure: a list of sets of attributes. 

326 Each list element is separated by ',' and within each list element, set 

327 elements are separated by '+'. The latter is almost never used in 

328 real world certificates. According to RFC4514 section 2.1 the 

329 RDNSequence must be reversed when converting to string representation. 

330 """ 

331 return ",".join( 

332 attr.rfc4514_string(attr_name_overrides) 

333 for attr in reversed(self._attributes) 

334 ) 

335 

336 def get_attributes_for_oid( 

337 self, 

338 oid: ObjectIdentifier, 

339 ) -> list[NameAttribute[str | bytes]]: 

340 return [i for i in self if i.oid == oid] 

341 

342 @property 

343 def rdns(self) -> list[RelativeDistinguishedName]: 

344 return self._attributes 

345 

346 def public_bytes(self, backend: typing.Any = None) -> bytes: 

347 return rust_x509.encode_name_bytes(self) 

348 

349 def __eq__(self, other: object) -> bool: 

350 if not isinstance(other, Name): 

351 return NotImplemented 

352 

353 return self._attributes == other._attributes 

354 

355 def __hash__(self) -> int: 

356 # TODO: this is relatively expensive, if this looks like a bottleneck 

357 # for you, consider optimizing! 

358 return hash(tuple(self._attributes)) 

359 

360 def __iter__(self) -> Iterator[NameAttribute]: 

361 for rdn in self._attributes: 

362 yield from rdn 

363 

364 def __len__(self) -> int: 

365 return sum(len(rdn) for rdn in self._attributes) 

366 

367 def __repr__(self) -> str: 

368 rdns = ",".join(attr.rfc4514_string() for attr in self._attributes) 

369 return f"<Name({rdns})>" 

370 

371 

372class _RFC4514NameParser: 

373 _OID_RE = re.compile(r"(0|([1-9]\d*))(\.(0|([1-9]\d*)))+") 

374 _DESCR_RE = re.compile(r"[a-zA-Z][a-zA-Z\d-]*") 

375 

376 _PAIR = r"\\([\\ #=\"\+,;<>]|[\da-zA-Z]{2})" 

377 _PAIR_RE = re.compile(_PAIR) 

378 _LUTF1 = r"[\x01-\x1f\x21\x24-\x2A\x2D-\x3A\x3D\x3F-\x5B\x5D-\x7F]" 

379 _SUTF1 = r"[\x01-\x21\x23-\x2A\x2D-\x3A\x3D\x3F-\x5B\x5D-\x7F]" 

380 _TUTF1 = r"[\x01-\x1F\x21\x23-\x2A\x2D-\x3A\x3D\x3F-\x5B\x5D-\x7F]" 

381 _UTFMB = rf"[\x80-{chr(sys.maxunicode)}]" 

382 _LEADCHAR = rf"{_LUTF1}|{_UTFMB}" 

383 _STRINGCHAR = rf"{_SUTF1}|{_UTFMB}" 

384 _TRAILCHAR = rf"{_TUTF1}|{_UTFMB}" 

385 _STRING_RE = re.compile( 

386 rf""" 

387 ( 

388 ({_LEADCHAR}|{_PAIR}) 

389 ( 

390 ({_STRINGCHAR}|{_PAIR})* 

391 ({_TRAILCHAR}|{_PAIR}) 

392 )? 

393 )? 

394 """, 

395 re.VERBOSE, 

396 ) 

397 _HEXSTRING_RE = re.compile(r"#([\da-zA-Z]{2})+") 

398 

399 def __init__(self, data: str, attr_name_overrides: _NameOidMap) -> None: 

400 self._data = data 

401 self._idx = 0 

402 

403 self._attr_name_overrides = attr_name_overrides 

404 

405 def _has_data(self) -> bool: 

406 return self._idx < len(self._data) 

407 

408 def _peek(self) -> str | None: 

409 if self._has_data(): 

410 return self._data[self._idx] 

411 return None 

412 

413 def _read_char(self, ch: str) -> None: 

414 if self._peek() != ch: 

415 raise ValueError 

416 self._idx += 1 

417 

418 def _read_re(self, pat) -> str: 

419 match = pat.match(self._data, pos=self._idx) 

420 if match is None: 

421 raise ValueError 

422 val = match.group() 

423 self._idx += len(val) 

424 return val 

425 

426 def parse(self) -> Name: 

427 """ 

428 Parses the `data` string and converts it to a Name. 

429 

430 According to RFC4514 section 2.1 the RDNSequence must be 

431 reversed when converting to string representation. So, when 

432 we parse it, we need to reverse again to get the RDNs on the 

433 correct order. 

434 """ 

435 

436 if not self._has_data(): 

437 return Name([]) 

438 

439 rdns = [self._parse_rdn()] 

440 

441 while self._has_data(): 

442 self._read_char(",") 

443 rdns.append(self._parse_rdn()) 

444 

445 return Name(reversed(rdns)) 

446 

447 def _parse_rdn(self) -> RelativeDistinguishedName: 

448 nas = [self._parse_na()] 

449 while self._peek() == "+": 

450 self._read_char("+") 

451 nas.append(self._parse_na()) 

452 

453 return RelativeDistinguishedName(nas) 

454 

455 def _parse_na(self) -> NameAttribute: 

456 try: 

457 oid_value = self._read_re(self._OID_RE) 

458 except ValueError: 

459 name = self._read_re(self._DESCR_RE) 

460 oid = self._attr_name_overrides.get( 

461 name, _NAME_TO_NAMEOID.get(name) 

462 ) 

463 if oid is None: 

464 raise ValueError 

465 else: 

466 oid = ObjectIdentifier(oid_value) 

467 

468 self._read_char("=") 

469 if self._peek() == "#": 

470 value = self._read_re(self._HEXSTRING_RE) 

471 value = binascii.unhexlify(value[1:]).decode() 

472 else: 

473 raw_value = self._read_re(self._STRING_RE) 

474 value = _unescape_dn_value(raw_value) 

475 

476 return NameAttribute(oid, value)