derivepassphrase.git

1) # SPDX-FileCopyrightText: 2025 Marco Ricci <software@the13thletter.info>

2) #

3) # SPDX-License-Identifier: Zlib

4) 

5) """Exporter for the vault "storeroom" configuration format.
6) 
7) The "storeroom" format is the experimental format used in alpha and beta
8) versions of vault beyond v0.3.0.  The configuration is stored as
9) a separate directory, which acts like a hash table (i.e. has named
10) slots) and provides an impure quasi-filesystem interface.  Each hash
11) table entry is separately encrypted and authenticated.  James Coglan
12) designed this format to avoid concurrent write issues when updating or
13) synchronizing the vault configuration with e.g. a cloud service.
14) 

15) The public interface is the [`export_storeroom_data`][] function.
16) Multiple *non-public* functions are additionally documented here for
17) didactical and educational reasons, but they are not part of the module
18) API, are subject to change without notice (including removal), and
19) should *not* be used or relied on.

20) 
21) """

22) 

23) from __future__ import annotations
24) 

25) import base64

26) import fnmatch

27) import json
28) import logging
29) import os
30) import os.path
31) import struct

32) from typing import TYPE_CHECKING, Any, TypedDict

33) 

34) from derivepassphrase import _cli_msg as _msg

35) from derivepassphrase import exporter
36) 

37) if TYPE_CHECKING:
38)     from collections.abc import Iterator
39) 

40)     from cryptography.hazmat.primitives import ciphers, hashes, hmac, padding
41)     from cryptography.hazmat.primitives.ciphers import algorithms, modes
42)     from cryptography.hazmat.primitives.kdf import pbkdf2

43)     from typing_extensions import Buffer

44) else:
45)     try:
46)         from cryptography.hazmat.primitives import (
47)             ciphers,
48)             hashes,
49)             hmac,
50)             padding,
51)         )
52)         from cryptography.hazmat.primitives.ciphers import algorithms, modes
53)         from cryptography.hazmat.primitives.kdf import pbkdf2
54)     except ModuleNotFoundError as exc:
55) 

56)         class _DummyModule:  # pragma: no cover

57)             def __init__(self, exc: type[Exception]) -> None:
58)                 self.exc = exc
59) 

60)             def __getattr__(self, name: str) -> Any:  # noqa: ANN401
61)                 def func(*args: Any, **kwargs: Any) -> Any:  # noqa: ANN401,ARG001

62)                     raise self.exc
63) 
64)                 return func
65) 

66)         ciphers = hashes = hmac = padding = _DummyModule(exc)
67)         algorithms = modes = pbkdf2 = _DummyModule(exc)

68)         STUBBED = True
69)     else:
70)         STUBBED = False
71) 

72) STOREROOM_MASTER_KEYS_UUID = b'35b7c7ed-f71e-4adf-9051-02fb0f1e0e17'
73) VAULT_CIPHER_UUID = b'73e69e8a-cb05-4b50-9f42-59d76a511299'
74) IV_SIZE = 16
75) KEY_SIZE = MAC_SIZE = 32
76) ENCRYPTED_KEYPAIR_SIZE = 128
77) VERSION_SIZE = 1
78) 

79) __all__ = ('export_storeroom_data',)
80) 

81) logger = logging.getLogger(__name__)

82) 
83) 

84) def _h(bs: Buffer) -> str:
85)     return '<{}>'.format(memoryview(bs).hex(' '))
86) 
87) 

88) class KeyPair(TypedDict):

89)     """A pair of AES256 keys, one for encryption and one for signing.
90) 
91)     Attributes:
92)         encryption_key:
93)             AES256 key, used for encryption with AES256-CBC (with PKCS#7
94)             padding).
95)         signing_key:
96)             AES256 key, used for signing with HMAC-SHA256.
97) 
98)     """
99) 

100)     encryption_key: bytes

101)     """"""

102)     signing_key: bytes

103)     """"""

104) 
105) 
106) class MasterKeys(TypedDict):

107)     """A triple of AES256 keys, for encryption, signing and hashing.
108) 
109)     Attributes:
110)         hashing_key:
111)             AES256 key, used for hashing with HMAC-SHA256 to derive
112)             a hash table slot for an item.
113)         encryption_key:
114)             AES256 key, used for encryption with AES256-CBC (with PKCS#7
115)             padding).
116)         signing_key:
117)             AES256 key, used for signing with HMAC-SHA256.
118) 
119)     """
120) 

121)     hashing_key: bytes

122)     """"""

123)     encryption_key: bytes

124)     """"""

125)     signing_key: bytes

126)     """"""

127) 
128) 
129) def derive_master_keys_keys(password: str | bytes, iterations: int) -> KeyPair:

130)     """Derive encryption and signing keys for the master keys data.
131) 
132)     The master password is run through a key derivation function to
133)     obtain a 64-byte string, which is then split to yield two 32-byte
134)     keys.  The key derivation function is PBKDF2, using HMAC-SHA1 and
135)     salted with the storeroom master keys UUID.
136) 
137)     Args:
138)         password:
139)             A master password for the storeroom instance.  Usually read
140)             from the `VAULT_KEY` environment variable, otherwise
141)             defaults to the username.
142)         iterations:
143)             A count of rounds for the underlying key derivation
144)             function.  Usually stored as a setting next to the encrypted
145)             master keys data.
146) 
147)     Returns:
148)         A 2-tuple of keys, the encryption key and the signing key, to
149)         decrypt and verify the master keys data with.
150) 

151)     Warning:
152)         Non-public function, provided for didactical and educational
153)         purposes only.  Subject to change without notice, including
154)         removal.
155) 

156)     """

157)     if isinstance(password, str):
158)         password = password.encode('ASCII')
159)     master_keys_keys_blob = pbkdf2.PBKDF2HMAC(

160)         algorithm=hashes.SHA1(),

161)         length=2 * KEY_SIZE,

162)         salt=STOREROOM_MASTER_KEYS_UUID,
163)         iterations=iterations,
164)     ).derive(password)
165)     encryption_key, signing_key = struct.unpack(
166)         f'{KEY_SIZE}s {KEY_SIZE}s', master_keys_keys_blob
167)     )
168)     logger.debug(

169)         _msg.TranslatedString(
170)             _msg.DebugMsgTemplate.DERIVED_MASTER_KEYS_KEYS,
171)             enc_key=_h(encryption_key),
172)             sign_key=_h(signing_key),
173)             pw_bytes=_h(password),
174)             algorithm='SHA256',
175)             length=64,
176)             salt=STOREROOM_MASTER_KEYS_UUID,
177)             iterations=iterations,

178)         ),
179)     )
180)     return {
181)         'encryption_key': encryption_key,
182)         'signing_key': signing_key,
183)     }
184) 
185) 
186) def decrypt_master_keys_data(data: bytes, keys: KeyPair) -> MasterKeys:

187)     r"""Decrypt the master keys data.

188) 
189)     The master keys data contains:
190) 
191)     - a 16-byte IV,

192)     - a 96-byte AES256-CBC-encrypted payload, plus 16 further bytes of
193)       PKCS7 padding, and
194)     - a 32-byte MAC of the preceding 128 bytes.

195) 
196)     The decrypted payload itself consists of three 32-byte keys: the
197)     hashing, encryption and signing keys, in that order.
198) 
199)     The encrypted payload is encrypted with the encryption key, and the
200)     MAC is created based on the signing key.  As per standard
201)     cryptographic procedure, the MAC can be verified before attempting
202)     to decrypt the payload.
203) 

204)     Because the payload size is both fixed and a multiple of the cipher
205)     blocksize, in this case, the PKCS7 padding always is `b'\x10' * 16`.

206) 
207)     Args:
208)         data:
209)             The encrypted master keys data.
210)         keys:
211)             The encryption and signing keys for the master keys data.
212)             These should have previously been derived via the

213)             [`derive_master_keys_keys`][] function.

214) 
215)     Returns:
216)         The master encryption, signing and hashing keys.
217) 

218)     Raises:
219)         cryptography.exceptions.InvalidSignature:
220)             The data does not contain a valid signature under the given
221)             key.
222)         ValueError:
223)             The format is invalid, in a non-cryptographic way.  (For
224)             example, it contains an unsupported version marker, or
225)             unexpected extra contents, or invalid padding.)
226) 

227)     Warning:
228)         Non-public function, provided for didactical and educational
229)         purposes only.  Subject to change without notice, including
230)         removal.
231) 

232)     """

233)     ciphertext, claimed_mac = struct.unpack(
234)         f'{len(data) - MAC_SIZE}s {MAC_SIZE}s', data
235)     )
236)     actual_mac = hmac.HMAC(keys['signing_key'], hashes.SHA256())
237)     actual_mac.update(ciphertext)
238)     logger.debug(

239)         _msg.TranslatedString(
240)             _msg.DebugMsgTemplate.MASTER_KEYS_DATA_MAC_INFO,
241)             sign_key=_h(keys['signing_key']),
242)             ciphertext=_h(ciphertext),
243)             claimed_mac=_h(claimed_mac),
244)             actual_mac=_h(actual_mac.copy().finalize()),

245)         ),
246)     )
247)     actual_mac.verify(claimed_mac)
248) 

249)     try:
250)         iv, payload = struct.unpack(
251)             f'{IV_SIZE}s {len(ciphertext) - IV_SIZE}s', ciphertext

252)         )

253)         decryptor = ciphers.Cipher(
254)             algorithms.AES256(keys['encryption_key']), modes.CBC(iv)
255)         ).decryptor()
256)         padded_plaintext = bytearray()
257)         padded_plaintext.extend(decryptor.update(payload))
258)         padded_plaintext.extend(decryptor.finalize())
259)         unpadder = padding.PKCS7(IV_SIZE * 8).unpadder()
260)         plaintext = bytearray()
261)         plaintext.extend(unpadder.update(padded_plaintext))
262)         plaintext.extend(unpadder.finalize())
263)         hashing_key, encryption_key, signing_key = struct.unpack(
264)             f'{KEY_SIZE}s {KEY_SIZE}s {KEY_SIZE}s', plaintext
265)         )
266)     except (ValueError, struct.error) as exc:
267)         msg = 'Invalid encrypted master keys payload'
268)         raise ValueError(msg) from exc

269)     return {
270)         'hashing_key': hashing_key,
271)         'encryption_key': encryption_key,
272)         'signing_key': signing_key,
273)     }
274) 
275) 

276) def decrypt_session_keys(data: bytes, master_keys: MasterKeys) -> KeyPair:

277)     r"""Decrypt the bucket item's session keys.

278) 
279)     The bucket item's session keys are single-use keys for encrypting
280)     and signing a single item in the storage bucket.  The encrypted
281)     session key data consists of:
282) 
283)     - a 16-byte IV,

284)     - a 64-byte AES256-CBC-encrypted payload, plus 16 further bytes of
285)       PKCS7 padding, and
286)     - a 32-byte MAC of the preceding 96 bytes.

287) 
288)     The encrypted payload is encrypted with the master encryption key,
289)     and the MAC is created with the master signing key.  As per standard
290)     cryptographic procedure, the MAC can be verified before attempting
291)     to decrypt the payload.
292) 

293)     Because the payload size is both fixed and a multiple of the cipher
294)     blocksize, in this case, the PKCS7 padding always is `b'\x10' * 16`.

295) 
296)     Args:
297)         data:
298)             The encrypted bucket item session key data.
299)         master_keys:
300)             The master keys.  Presumably these have previously been

301)             obtained via the [`decrypt_master_keys_data`][] function.

302) 
303)     Returns:
304)         The bucket item's encryption and signing keys.
305) 

306)     Raises:
307)         cryptography.exceptions.InvalidSignature:
308)             The data does not contain a valid signature under the given
309)             key.
310)         ValueError:
311)             The format is invalid, in a non-cryptographic way.  (For
312)             example, it contains an unsupported version marker, or
313)             unexpected extra contents, or invalid padding.)

314) 

315)     Warning:
316)         Non-public function, provided for didactical and educational
317)         purposes only.  Subject to change without notice, including
318)         removal.
319) 

320)     """

321)     ciphertext, claimed_mac = struct.unpack(
322)         f'{len(data) - MAC_SIZE}s {MAC_SIZE}s', data
323)     )

324)     actual_mac = hmac.HMAC(master_keys['signing_key'], hashes.SHA256())

325)     actual_mac.update(ciphertext)
326)     logger.debug(

327)         _msg.TranslatedString(
328)             _msg.DebugMsgTemplate.DECRYPT_BUCKET_ITEM_SESSION_KEYS_MAC_INFO,
329)             sign_key=_h(master_keys['signing_key']),
330)             ciphertext=_h(ciphertext),
331)             claimed_mac=_h(claimed_mac),
332)             actual_mac=_h(actual_mac.copy().finalize()),

333)         ),
334)     )
335)     actual_mac.verify(claimed_mac)
336) 

337)     try:
338)         iv, payload = struct.unpack(
339)             f'{IV_SIZE}s {len(ciphertext) - IV_SIZE}s', ciphertext
340)         )
341)         decryptor = ciphers.Cipher(
342)             algorithms.AES256(master_keys['encryption_key']), modes.CBC(iv)
343)         ).decryptor()
344)         padded_plaintext = bytearray()
345)         padded_plaintext.extend(decryptor.update(payload))
346)         padded_plaintext.extend(decryptor.finalize())
347)         unpadder = padding.PKCS7(IV_SIZE * 8).unpadder()
348)         plaintext = bytearray()
349)         plaintext.extend(unpadder.update(padded_plaintext))
350)         plaintext.extend(unpadder.finalize())
351)         session_encryption_key, session_signing_key = struct.unpack(
352)             f'{KEY_SIZE}s {KEY_SIZE}s', plaintext
353)         )
354)     except (ValueError, struct.error) as exc:
355)         msg = 'Invalid encrypted session keys payload'
356)         raise ValueError(msg) from exc

357) 
358)     session_keys: KeyPair = {
359)         'encryption_key': session_encryption_key,
360)         'signing_key': session_signing_key,
361)     }
362) 
363)     logger.debug(

364)         _msg.TranslatedString(
365)             _msg.DebugMsgTemplate.DECRYPT_BUCKET_ITEM_SESSION_KEYS_INFO,
366)             enc_key=_h(master_keys['encryption_key']),
367)             iv=_h(iv),
368)             ciphertext=_h(payload),
369)             plaintext=_h(plaintext),
370)             code=_msg.TranslatedString(
371)                 '{{"encryption_key": bytes.fromhex({enc_key!r}), '
372)                 '"signing_key": bytes.fromhex({sign_key!r})}}',
373)                 enc_key=session_keys['encryption_key'].hex(' '),
374)                 sign_key=session_keys['signing_key'].hex(' '),
375)             ),

376)         ),
377)     )
378) 
379)     return session_keys
380) 
381) 

382) def decrypt_contents(data: bytes, session_keys: KeyPair) -> bytes:
383)     """Decrypt the bucket item's contents.
384) 
385)     The data consists of:
386) 
387)     - a 16-byte IV,
388)     - a variable-sized AES256-CBC-encrypted payload (using PKCS7 padding
389)       on the inside), and

390)     - a 32-byte MAC of the preceding bytes.

391) 
392)     The encrypted payload is encrypted with the bucket item's session
393)     encryption key, and the MAC is created with the bucket item's
394)     session signing key.  As per standard cryptographic procedure, the
395)     MAC can be verified before attempting to decrypt the payload.
396) 
397)     Args:
398)         data:
399)             The encrypted bucket item payload data.
400)         session_keys:
401)             The bucket item's session keys.  Presumably these have

402)             previously been obtained via the [`decrypt_session_keys`][]

403)             function.
404) 
405)     Returns:
406)         The bucket item's payload.
407) 

408)     Raises:
409)         cryptography.exceptions.InvalidSignature:
410)             The data does not contain a valid signature under the given
411)             key.
412)         ValueError:
413)             The format is invalid, in a non-cryptographic way.  (For
414)             example, it contains an unsupported version marker, or
415)             unexpected extra contents, or invalid padding.)

416) 

417)     Warning:
418)         Non-public function, provided for didactical and educational
419)         purposes only.  Subject to change without notice, including
420)         removal.
421) 

422)     """

423)     ciphertext, claimed_mac = struct.unpack(
424)         f'{len(data) - MAC_SIZE}s {MAC_SIZE}s', data
425)     )

426)     actual_mac = hmac.HMAC(session_keys['signing_key'], hashes.SHA256())

427)     actual_mac.update(ciphertext)
428)     logger.debug(

429)         _msg.TranslatedString(
430)             _msg.DebugMsgTemplate.DECRYPT_BUCKET_ITEM_MAC_INFO,
431)             sign_key=_h(session_keys['signing_key']),
432)             ciphertext=_h(ciphertext),
433)             claimed_mac=_h(claimed_mac),
434)             actual_mac=_h(actual_mac.copy().finalize()),

435)         ),
436)     )
437)     actual_mac.verify(claimed_mac)
438) 
439)     iv, payload = struct.unpack(
440)         f'{IV_SIZE}s {len(ciphertext) - IV_SIZE}s', ciphertext
441)     )
442)     decryptor = ciphers.Cipher(

443)         algorithms.AES256(session_keys['encryption_key']), modes.CBC(iv)

444)     ).decryptor()
445)     padded_plaintext = bytearray()
446)     padded_plaintext.extend(decryptor.update(payload))
447)     padded_plaintext.extend(decryptor.finalize())
448)     unpadder = padding.PKCS7(IV_SIZE * 8).unpadder()
449)     plaintext = bytearray()
450)     plaintext.extend(unpadder.update(padded_plaintext))
451)     plaintext.extend(unpadder.finalize())
452) 
453)     logger.debug(

454)         _msg.TranslatedString(
455)             _msg.DebugMsgTemplate.DECRYPT_BUCKET_ITEM_INFO,
456)             enc_key=_h(session_keys['encryption_key']),
457)             iv=_h(iv),
458)             ciphertext=_h(payload),
459)             plaintext=_h(plaintext),

460)         ),
461)     )
462) 
463)     return plaintext
464) 
465) 

466) def decrypt_bucket_item(bucket_item: bytes, master_keys: MasterKeys) -> bytes:

467)     """Decrypt a bucket item.
468) 
469)     Args:
470)         bucket_item:
471)             The encrypted bucket item.
472)         master_keys:
473)             The master keys.  Presumably these have previously been

474)             obtained via the [`decrypt_master_keys_data`][] function.

475) 
476)     Returns:
477)         The decrypted bucket item.
478) 
479)     Raises:
480)         cryptography.exceptions.InvalidSignature:
481)             The data does not contain a valid signature under the given
482)             key.
483)         ValueError:
484)             The format is invalid, in a non-cryptographic way.  (For
485)             example, it contains an unsupported version marker, or
486)             unexpected extra contents, or invalid padding.)
487) 

488)     Warning:
489)         Non-public function, provided for didactical and educational
490)         purposes only.  Subject to change without notice, including
491)         removal.
492) 

493)     """

494)     logger.debug(

495)         _msg.TranslatedString(
496)             _msg.DebugMsgTemplate.DECRYPT_BUCKET_ITEM_KEY_INFO,
497)             plaintext=_h(bucket_item),
498)             enc_key=_h(master_keys['encryption_key']),
499)             sign_key=_h(master_keys['signing_key']),

500)         ),
501)     )
502)     data_version, encrypted_session_keys, data_contents = struct.unpack(
503)         (
504)             f'B {ENCRYPTED_KEYPAIR_SIZE}s '

505)             f'{len(bucket_item) - 1 - ENCRYPTED_KEYPAIR_SIZE}s'

506)         ),

507)         bucket_item,

508)     )
509)     if data_version != 1:
510)         msg = f'Cannot handle version {data_version} encrypted data'

511)         raise ValueError(msg)

512)     session_keys = decrypt_session_keys(encrypted_session_keys, master_keys)
513)     return decrypt_contents(data_contents, session_keys)
514) 
515) 

516) def decrypt_bucket_file(

517)     filename: str,
518)     master_keys: MasterKeys,
519)     *,
520)     root_dir: str | bytes | os.PathLike = '.',

521) ) -> Iterator[bytes]:

522)     """Decrypt a complete bucket.

523) 
524)     Args:
525)         filename:
526)             The bucket file's filename.
527)         master_keys:
528)             The master keys.  Presumably these have previously been

529)             obtained via the [`decrypt_master_keys_data`][] function.

530)         root_dir:
531)             The root directory of the data store.  The filename is
532)             interpreted relatively to this directory.
533) 
534)     Yields:

535)         A decrypted bucket item.

536) 
537)     Raises:
538)         cryptography.exceptions.InvalidSignature:
539)             The data does not contain a valid signature under the given
540)             key.
541)         ValueError:
542)             The format is invalid, in a non-cryptographic way.  (For
543)             example, it contains an unsupported version marker, or
544)             unexpected extra contents, or invalid padding.)
545) 

546)     Warning:
547)         Non-public function, provided for didactical and educational
548)         purposes only.  Subject to change without notice, including
549)         removal.
550) 

551)     """

552)     with open(
553)         os.path.join(os.fsdecode(root_dir), filename), 'rb'
554)     ) as bucket_file:

555)         header_line = bucket_file.readline()
556)         try:
557)             header = json.loads(header_line)
558)         except ValueError as exc:
559)             msg = f'Invalid bucket file: {filename}'

560)             raise ValueError(msg) from exc

561)         if header != {'version': 1}:
562)             msg = f'Invalid bucket file: {filename}'

563)             raise ValueError(msg) from None

564)         for line in bucket_file:

565)             yield decrypt_bucket_item(
566)                 base64.standard_b64decode(line), master_keys

567)             )
568) 
569) 

570) def _store(config: dict[str, Any], path: str, json_contents: bytes) -> None:

571)     """Store the JSON contents at path in the config structure.
572) 
573)     Traverse the config structure according to path, and set the value
574)     of the leaf to the decoded JSON contents.
575) 
576)     A path `/foo/bar/xyz` translates to the JSON structure
577)     `{"foo": {"bar": {"xyz": ...}}}`.
578) 
579)     Args:
580)         config:
581)             The (top-level) configuration structure to update.
582)         path:
583)             The path within the configuration structure to traverse.
584)         json_contents:
585)             The contents to set the item to, after JSON-decoding.
586) 
587)     Raises:
588)         json.JSONDecodeError:
589)             There was an error parsing the JSON contents.
590) 
591)     """
592)     contents = json.loads(json_contents)
593)     path_parts = [part for part in path.split('/') if part]
594)     for part in path_parts[:-1]:
595)         config = config.setdefault(part, {})
596)     if path_parts:
597)         config[path_parts[-1]] = contents
598) 
599) 

600) def export_storeroom_data(  # noqa: C901,PLR0912,PLR0914,PLR0915

601)     storeroom_path: str | bytes | os.PathLike | None = None,
602)     master_keys_key: str | bytes | None = None,

603) ) -> dict[str, Any]:
604)     """Export the full configuration stored in the storeroom.
605) 
606)     Args:
607)         storeroom_path:

608)             Path to the storeroom; usually `~/.vault`.  If not given,

609)             then query [`exporter.get_vault_path`][] for the value.

610)         master_keys_key:

611)             Encryption key/password for the master keys, usually the
612)             username, or passed via the `VAULT_KEY` environment
613)             variable.  If not given, then query

614)             [`exporter.get_vault_key`][] for the value.

615) 
616)     Returns:
617)         The full configuration, as stored in the storeroom.
618) 
619)         This may or may not be a valid configuration according to vault
620)         or derivepassphrase.
621) 
622)     Raises:
623)         RuntimeError:
624)             Something went wrong during data collection, e.g. we
625)             encountered unsupported or corrupted data in the storeroom.
626)         json.JSONDecodeError:
627)             An internal JSON data structure failed to parse from disk.
628)             The storeroom is probably corrupted.
629) 
630)     """

631)     if storeroom_path is None:
632)         storeroom_path = exporter.get_vault_path()

633)     if master_keys_key is None:

634)         master_keys_key = exporter.get_vault_key()

635)     with open(
636)         os.path.join(os.fsdecode(storeroom_path), '.keys'), encoding='utf-8'
637)     ) as master_keys_file:

638)         header = json.loads(master_keys_file.readline())
639)         if header != {'version': 1}:
640)             msg = 'bad or unsupported keys version header'
641)             raise RuntimeError(msg)
642)         raw_keys_data = base64.standard_b64decode(master_keys_file.readline())
643)         encrypted_keys_params, encrypted_keys = struct.unpack(
644)             f'B {len(raw_keys_data) - 1}s', raw_keys_data
645)         )
646)         if master_keys_file.read():
647)             msg = 'trailing data; cannot make sense of .keys file'
648)             raise RuntimeError(msg)
649)     encrypted_keys_version = encrypted_keys_params >> 4
650)     if encrypted_keys_version != 1:
651)         msg = f'cannot handle version {encrypted_keys_version} encrypted keys'
652)         raise RuntimeError(msg)

653)     logger.info(
654)         _msg.TranslatedString(_msg.InfoMsgTemplate.PARSING_MASTER_KEYS_DATA)
655)     )

656)     encrypted_keys_iterations = 2 ** (10 + (encrypted_keys_params & 0x0F))
657)     master_keys_keys = derive_master_keys_keys(

658)         master_keys_key, encrypted_keys_iterations

659)     )
660)     master_keys = decrypt_master_keys_data(encrypted_keys, master_keys_keys)
661) 

662)     config_structure: dict[str, Any] = {}
663)     json_contents: dict[str, bytes] = {}

664)     # Use glob.glob(..., root_dir=...) here once Python 3.9 becomes
665)     # unsupported.
666)     storeroom_path_str = os.fsdecode(storeroom_path)
667)     valid_hashdirs = [
668)         hashdir_name
669)         for hashdir_name in os.listdir(storeroom_path_str)
670)         if fnmatch.fnmatch(hashdir_name, '[01][0-9a-f]')
671)     ]
672)     for file in valid_hashdirs:

673)         logger.info(
674)             _msg.TranslatedString(
675)                 _msg.InfoMsgTemplate.DECRYPTING_BUCKET,
676)                 bucket_number=file,
677)             )
678)         )

679)         bucket_contents = list(
680)             decrypt_bucket_file(file, master_keys, root_dir=storeroom_path)
681)         )

682)         bucket_index = json.loads(bucket_contents.pop(0))
683)         for pos, item in enumerate(bucket_index):
684)             json_contents[item] = bucket_contents[pos]
685)             logger.debug(

686)                 _msg.TranslatedString(
687)                     _msg.DebugMsgTemplate.BUCKET_ITEM_FOUND,
688)                     path=item,
689)                     value=bucket_contents[pos],
690)                 )

691)             )
692)     dirs_to_check: dict[str, list[str]] = {}
693)     json_payload: Any

694)     logger.info(
695)         _msg.TranslatedString(_msg.InfoMsgTemplate.ASSEMBLING_CONFIG_STRUCTURE)
696)     )

697)     for path, json_content in sorted(json_contents.items()):
698)         if path.endswith('/'):
699)             logger.debug(

700)                 _msg.TranslatedString(
701)                     _msg.DebugMsgTemplate.POSTPONING_DIRECTORY_CONTENTS_CHECK,
702)                     path=path,
703)                     contents=json_content.decode('utf-8'),
704)                 )

705)             )
706)             json_payload = json.loads(json_content)
707)             if not isinstance(json_payload, list) or any(
708)                 not isinstance(x, str) for x in json_payload
709)             ):
710)                 msg = (
711)                     f'Directory index is not actually an index: '
712)                     f'{json_content!r}'
713)                 )
714)                 raise RuntimeError(msg)
715)             dirs_to_check[path] = json_payload
716)             logger.debug(

717)                 _msg.TranslatedString(
718)                     _msg.DebugMsgTemplate.SETTING_CONFIG_STRUCTURE_CONTENTS_EMPTY_DIRECTORY,
719)                     path=path,
720)                 ),

721)             )

722)             _store(config_structure, path, b'{}')

723)         else:
724)             logger.debug(

725)                 _msg.TranslatedString(
726)                     _msg.DebugMsgTemplate.SETTING_CONFIG_STRUCTURE_CONTENTS,
727)                     path=path,
728)                     value=json_content.decode('utf-8'),
729)                 ),

730)             )

731)             _store(config_structure, path, json_content)

732)     logger.info(
733)         _msg.TranslatedString(
734)             _msg.InfoMsgTemplate.CHECKING_CONFIG_STRUCTURE_CONSISTENCY,
735)         )
736)     )

737)     # Sorted order is important; see `maybe_obj` below.

738)     for _dir, namelist in sorted(dirs_to_check.items()):

739)         namelist = [x.rstrip('/') for x in namelist]  # noqa: PLW2901

740)         obj: dict[Any, Any] = config_structure
741)         for part in _dir.split('/'):
742)             if part:
743)                 # Because we iterate paths in sorted order, parent
744)                 # directories are encountered before child directories.
745)                 # So parent directories always exist (lest we would have
746)                 # aborted earlier).
747)                 #
748)                 # Of course, the type checker doesn't necessarily know
749)                 # this, so we need to use assertions anyway.
750)                 maybe_obj = obj.get(part)

751)                 assert isinstance(maybe_obj, dict), (
752)                     f'Cannot traverse storage path {_dir!r}'
753)                 )

754)                 obj = maybe_obj

755)         if set(obj.keys()) != set(namelist):
756)             msg = f'Object key mismatch for path {_dir!r}'
757)             raise RuntimeError(msg)

758)         logger.debug(
759)             _msg.TranslatedString(
760)                 _msg.DebugMsgTemplate.DIRECTORY_CONTENTS_CHECK_OK,
761)                 path=_dir,
762)                 contents=json.dumps(namelist),
763)             )
764)         )

765)     return config_structure

766) 
767) 
768) if __name__ == '__main__':