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Promote the scanned tree by identity, not by pathname - #49
maximmasiutin merged 7 commits into
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…e a scratch base another account can delete children in lets it rename the scanned tree aside and leave its own at the same name after the ClamAV gate, and restore the cross-device narrowing that never reached master
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📝 WalkthroughWalkthroughTrivy cache promotion now validates staged directory device/inode identity before promotion. It rejects substituted or unavailable staging paths, preserves the live cache, and limits copy fallback to cross-device rename errors. ChangesTrivy promotion hardening
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The PR adds identity checks before promotion and narrows fallback retries, but the current promotion path can still follow a substituted live-cache link, potentially redirecting replacement and leaving the cache dangling during cleanup. This concrete merge-readiness risk requires a fix or explicit acceptance; the changelog wording and one regression assertion also need follow-up. Sequence Diagram(s)sequenceDiagram
participant TrivyRefresh
participant promote_into
participant Filesystem
participant LiveCache
TrivyRefresh->>Filesystem: record staged cache identity
TrivyRefresh->>promote_into: pass staged path and identity
promote_into->>Filesystem: validate staged identity
promote_into->>LiveCache: rename or cross-device copy
promote_into-->>TrivyRefresh: return success or promotion error
Possibly related PRs
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
In `@update_scanners.py`:
- Around line 1194-1200: Update dir_identity to use Path.lstat() so identity
checks inspect the staged link entry rather than following symlinks or
junctions. Add a regression covering staged substitution with a symlink or
junction, asserting ScratchSwappedError and verifying live remains unchanged.
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Inline comments:
In `@CHANGELOG.md`:
- Line 33: Update the changelog entry to describe the device/inode check as
validating the staged tree’s identity before promotion, rather than implying
that promotion itself uses identity-based renaming. Preserve the documented
remaining TOCTOU window and live-cache behavior.
In `@tests/test_regressions.py`:
- Around line 1567-1581: Update
test_a_staged_tree_that_cannot_be_stated_is_not_promoted to create a sentinel
file under live before calling promote_into, then assert the sentinel remains
unchanged after ScratchSwappedError is raised, verifying that refusal does not
modify live.
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…here the source is still trusted by pathname, since stat through a symlink reported the moved-aside original and passed, and the cleanup before the rename and the whole cross-device copy sat outside the one check
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…scratch, since an account that renames the validated tree aside during the copy and back before the check restores the inode and passes a comparison the token defeats
… identity reads cannot see a swap reverted between them nor one made part-way through, and the answer to what the cache receives should be the bytes something looked at rather than the name they arrived under
…since the marker check took promote_into to a cognitive complexity of 18 against the threshold of 15
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…y' of maximmasiutin.github.com:maximmasiutin/lockfile-sentinel into wt-pr49-local # Conflicts: # tests/test_regressions.py # update_scanners.py
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…ed, since the token cannot see a swap that lands after the copy begins and leaves the real token beside another tree's files
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Pull request overview
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Suppressed comments (2)
update_scanners.py:1265
_refuse_if_swapped()callsis_reparse_point(staged)before attempting to stat for identity. On Windows,is_reparse_point()returnsTrueon anyOSError, so a missing/unstatable directory will be reported as “is a link” instead of “could not be stat’d …”. Consider doing a singlelstat()first, using it for both the reparse-point check and the(st_dev, st_ino)comparison, so stat failures get the correct message and you avoid double-stat races.
if is_reparse_point(staged):
raise ScratchSwappedError(
f"the staged tree {staged} is a link rather than the directory that was "
"scanned, so another account replaced it after the gate")
try:
current = dir_identity(staged)
update_scanners.py:1313
shutil.copytree(staged, incoming)failures are not cleaned up.copytree()can raiseOSErrororshutil.Errorafter partially creatingincoming, leaving a half-written.incomingtree behind (and potentially causing the next run’sshutil.rmtree(incoming)to fail). Wrap the copy in a try/except and removeincomingon any copy failure as well, not only on post-copy validation errors.
shutil.copytree(staged, incoming)
try:
_refuse_if_swapped(staged, identity, when="during the copy")
if token is not None:
_require_marker(incoming, token)
Fixes #25. Cut from master at b67e8d2 and merges into master.
What changed
The staged Trivy databases are promoted by identity rather than by pathname.
dir_identityrecords the staged tree'sst_devandst_inowhentarget_trivy_dbcreates it,promote_intotakes astaged_identityargument and re-reads that pair immediately before the tree leaves the scratch, and a mismatch raisesScratchSwappedError, which the caller reports as a refusal with the live cache untouched. An identity that cannot be read is a mismatch, not a pass: treating the failure as a pass would restore pathname trust in exactly the case where something is already wrong.Portable, with no platform branch.
st_inocarries the NTFS file index on Windows, which is the valueGetFileInformationByHandlereports, so the Windows-only handle API the issue sketches buys nothing here.As the issue asks, this is documented as narrowing the window rather than closing it: an account able to rename the scratch aside can still do so between the comparison and the rename. Closing it entirely needs a handle held open across the whole interval, which is Windows-only, or refusing any base other accounts can write to, which discards the free-space flexibility the scratch base selection exists to provide.
report_scratch_privacytherefore keeps warning on a shared base rather than refusing: that trade is worth a deliberate decision rather than arriving as a side effect of this fix.The extra fix in this PR, and why it is here
promote_intoon master falls back toshutil.copytreeon anyOSErrorfrom the first rename, so a permission or missing-path failure is retried as a copy that half-writes the.incomingtree and reports its own error in place of the real cause. PR #40's review round fixed this in commit d2a1acc, narrowing the fallback toerrno.EXDEVand Windows error 17, but that commit was never pushed:git branch --contains d2a1acclists only the local branch. The operator merged the remote tip, so neither the fix nor its regression test reached master.It is restored here rather than in its own PR because it lives inside
promote_into, which this PR also modifies, and a second PR from master would collide in that function.Tests
Four added. A staged tree renamed aside and replaced at the same name is refused and the live cache still reads its old content; a staged tree that cannot be stat'd is refused; an unswapped tree still promotes, so the check does not refuse the case it guards; and a rename failing with
EPERMpropagates as itself withcopytreemonkeypatched to fail the test if it runs.Gate
176 tests, mypy clean, pylint 10.00/10, bandit clean, semgrep
p/pythonandp/security-auditclean. SonarQube under keymaximmasiutin_lockfile-sentinel_scratch-identity: 0 violations, 0 code smells, 0 bugs, 0 vulnerabilities over 7082 ncloc.Summary by CodeRabbit
Bug Fixes
Tests