fix(auth): compare fixed-size bearer credential digests - #808
fix(auth): compare fixed-size bearer credential digests#808seonghobae wants to merge 14 commits into
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drafts: true📝 WalkthroughWalkthroughBearer 토큰 검증이 길이 불일치 시에도 더미 Changes인증 토큰 비교 보강
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to This change rejects mismatched Bearer tokens after a dummy digest comparison, but its test does not verify that comparison and the new security documentation has a formatting violation. Addressing these minor issues will improve confidence in the security fix and keep documentation checks clean. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In @.jules/sentinel.md:
- Line 94: Update the heading “2025-05-18 - Fix timing attack vulnerability in
credentials comparison” in sentinel.md by adding a blank line immediately after
it to satisfy markdown heading spacing requirements.
In `@tests/test_auth.py`:
- Around line 442-446: Strengthen the _parse_access_failure test by mocking
hmac.compare_digest and asserting it is called exactly once with b"wrong-len".
Configure MockSettings with AuthenticationMode.REQUIRED so the test preserves
the actual required-authentication contract while still verifying the dummy
comparison.
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seonghobae
changed the title
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Current exact boundary
develop@e06b1f3fb10903569124af011da213951e6e24739a5449c03b82bb8c986c26dc0032ef9df8230d91ahead_by=11,behind_by=0; effective protected-base delta is exactly 3 auth filesFinding
Python's current
hmac.compare_digestdocumentation explicitly warns that different input lengths can theoretically reveal type/length information. The original Jules repair did not remove that dependency from the request path: it branched onlen(credentials) != len(expected_token)and ran a dummy comparison over attacker-selected bytes. Codex independently identified the same P2 issue. The added test only proved401, so it would have stayed GREEN even if the dummy comparison were removed.Primary source: Python 3.14.7
hmac.compare_digestdocumentation, updated 2026-09-03: https://docs.python.org/3/library/hmac.html#hmac.compare_digestRED → GREEN
The auth boundary derives the configured token's SHA-256 digest once when immutable
RuntimeSettingsis constructed./parseno longer encodes, hashes, or branches on the expected token length per request. It hashes only the bounded caller credential and sends two fixed 32-byte values tohmac.compare_digest.tests/test_auth.py::test_access_comparison_uses_fixed_size_digests_for_variable_lengthsexercises a short invalid credential, a longer invalid credential, and the exact valid credential. It records the comparison boundary and requires every invocation to receive(32, 32)byte inputs while preserving401/401/acceptedbehavior.This is a structural regression contract, not a wall-clock benchmark. It does not claim that the complete HTTP request path is mathematically constant-time; it removes the secret-token-length-dependent branch and variable-length
compare_digestinputs that motivated this PR.Repair hygiene
The generated
.jules/sentinel.mdtiming doctrine was already restored to the exact protected-base blob. Its prescription to branch on expected length and performcompare_digest(credentials, credentials)is not a generally valid security rule.A later descendant also changed
uv.lockfrom the protected base while neitherpyproject.tomlnor this auth boundary owns dependency policy. That lock-only drift was removed in the normal descendant9a5449c03b82bb8c986c26dc0032ef9df8230d91; fresh compare now shows onlysrc/newsdom_api/config.py,src/newsdom_api/main.py, andtests/test_auth.py. This PR therefore does not depend on or override the separate pypdf security/release lane.No force push, destructive rebase, self-approval, dummy retrigger, gate weakening, or mutable sibling dependency was used.
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Fresh exact-head workflows are all non-terminal: tests
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