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fix(sdk): parse the zip EOCD and honour zip64 extras by sentinel (DSPX-4591) - #1017
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly summarizes the primary changes: parsing ZIP EOCD records and honoring ZIP64 extra fields based on sentinel values.
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A rabbit checks the archive’s tail,
And counts each record without fail.
ZIP64 fields fall into place,
Bad bounds are stopped before the race.
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Closes [DSPX-4592](https://virtru.atlassian.net/browse/DSPX-4592). ## Why ZIP central-directory offsets and sizes are 32-bit **unsigned** on the wire. A reader that widens one with a signed read sees anything `>= 2**31` as negative; at or above `2**32` the format mandates the ZIP64 sentinel, so the 32-bit field never holds a real value. That leaves exactly one broken window, `[2**31, 2**32)`, and nothing in this suite reached it — `--large` is 5 GiB, which steps straight over. ## What lands - `xtest/sizes.py` — adds `medium` (2 254 857 830 B, ~102 MiB inside the low edge of the window — shrinking it doesn't make the test cheaper, it makes it vacuous) and the window predicates (`in_zip64_window`, `exercises_zip64_window`). - `xtest/zipinspect.py` — a raw ZIP central-directory reader that keeps the 32-bit fields alongside the resolved values. `zipfile` normalises ZIP64 away, which is exactly the encoding under test. Lets a failure name the SDK at fault instead of reporting "decrypt failed" after an hour and 6 GiB of IO. - `xtest/test_zip64.py` — the roundtrip cell, marked `zip64` and **deselected** (not skipped) unless the session's sizes reach `2**31`. Asserts an offset actually landed in the window, so a mis-sized payload fails rather than passes vacuously. Writer conformance is checked *before* the reader xfail is applied, so a writer regression can't hide behind a known reader bug. Reuses `tdfs.skip_chunky_skew` (from [#590](#590)) to keep the independent segment-defaulting defect out of the ZIP64 result. - `tdfs.zip64_reader_xfail` — `xfail(strict=True)` keyed on semver for java decryptors predating java-sdk#393. Strict, so the cell must flip to a hard failure when the fix ships and somebody deletes the predicate. - A nightly-only `zip64` job in `xtest.yml`: own 90 m timeout, matrixed over the encrypting SDK, no `--skip-released-pairs` (a released java decryptor is the point). Parses its own junit XML and fails if no cell executed. Also pins the `bench` job's platform ref through the same resolved main SHA the zip64 job uses, so both share one commit instead of resolving "main" independently. - `xtest/test_zip64_units.py` (20 tests) on the offline PR gate, since the nightly's verdict is only as good as this parser. - `spec/DSPX-4592.md` — spec and live-run findings. ## Sibling PRs | Repo | PR | Covers | |---|---|---| | java-sdk | opentdf/java-sdk#396 | DSPX-4589 — `readUnsignedInt`, `needsZip64`, segment-size defaulting | | platform (go) | opentdf/platform#3979 | DSPX-4590 — `resolveSegmentSizes`, `LoadTDF` payload size | | web-sdk | opentdf/web-sdk#1017 | DSPX-4591 — ZIP64 writer conformance | Stacked on [#590](#590) (chunky segment-defaulting), which stacks on [#589](#589) (configurable payload sizes), which stacks on [#588](#588) (XT_FORCE_SUPPORTS). This PR is scoped to ZIP64 conformance only — chunky segment-defaulting coverage split out to #590 since it's an orthogonal, independently-mergeable concern found along the way. ## Follow-ups (not in this PR) - Once the go and java fixes release, replace the `exit 1` in the `chunky)` case of `xtest/sdk/{go,java}/cli.sh` with real version gates. - Consider widening `zip64_reader_xfail` once the first nightly reports which cells actually fail. ## Verification `ruff check` / `ruff format` / `pyright` clean from `xtest/`. Full offline harness suite (177 tests) passes. `actionlint` on `xtest.yml`/`check.yml` reports the same 15 pre-existing shellcheck info findings as `main`, no new ones. Draft: the `zip64` job has not had a live `workflow_dispatch` run yet. Doing that against this branch is the last gate before marking ready. [DSPX-4592]: https://virtru.atlassian.net/browse/DSPX-4592?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit - **New Features** - Added configurable payload-size testing for small, medium, chunky, and large scenarios. - Added optional controls for forcing feature support and running ZIP64 validation workflows. - Added cross-SDK ZIP64 boundary coverage for large files and multi-segment containers. - **Bug Fixes** - Improved detection and reporting of malformed ZIP64 structures and unexpected test-support errors. - **Documentation** - Documented test-size options, environment settings, and ZIP64 validation coverage. - Documented the deprecated `--large` option alias. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Inline comments:
In `@lib/tdf3/src/utils/zip-reader.ts`:
- Around line 178-185: When ZIP64 is needed and the EOCD is too close to the
start of the initial tail to include its locator, widen the read to
MAX_EOCDR_SEARCH_SIZE before calling getZip64EndOfCentralDirectory, then
recompute eocdrOffset from the widened tail. Keep the existing ZIP64 resolution
path for cases that do not need a wider read.
- Around line 417-422: Pass eocd.zip64 from getCentralDirectory into
parseCDBuffer, then reject unresolved ZIP64 sentinel values when the archive is
ZIP64 and the entry lacks a 0x0001 extended information field. Do not reject
0xffffffff values in non-ZIP64 archives.
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…X-4591) - locate and parse the end of central directory record, following the zip64 locator when any EOCD field carries its sentinel, and walk exactly the declared number of central directory records from the declared offset instead of scanning backwards for signatures - re-read the tail when a comment pushes the zip64 locator out of the initial read - honour the zip64 extended information extra field by sentinel value, not versionNeededToExtract, and reject an unresolved sentinel in a zip64 archive - report oversized manifest sizes without 32 bit wraparound Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
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https://virtru.atlassian.net/browse/DSPX-4591
Audit of java-sdk #393 against the Go
and Web zip implementations turned up four ZIP64/APPNOTE conformance divergences in
web-sdk. Findings 1, 2 and 4 (the reader) are addressed here. Finding 3 (the writer's
data descriptor) is split out into #1086 so the two can land independently.
Related DSPX-4591 PRs:
main.readUInt16LE/readUInt32LEandfromUrlRange validation. Independent, based onmain.readRangebounds checks and typed errors for hostile offsets. Stacked on this PR.Finding 1 — the reader never parsed the end of central directory record
getCDBuffers()scanned the last 1000 bytes of the file backwards for anythingmatching the central directory signature
0x02014b50and treated every hit as anentry, inferring record boundaries from the position of the next hit.
Replaced with real end-of-central-directory parsing:
ZipReader.getEndOfCentralDirectory()locates the EOCD record by scanning the tailfor
0x06054b50and accepting a candidate only when its declared comment lengthputs the end of the comment exactly at the end of the archive. That rules out
payload bytes that happen to spell the signature, and it handles trailing archive
comments. The tail read starts at 1 KiB (enough for the comment-less containers we
write) and widens once to
22 + 0xffff + 20bytes if the record isn't in there.0xffffentry count,0xffffffffCD size,0xffffffffCD offset) the reader follows the ZIP64 end ofcentral directory locator that sits immediately before the EOCD and reads the ZIP64
EOCD record it points at, taking the entry count, CD size and CD offset from there.
getCDBuffers()now takes the central directory chunk plus the declared entrycount, and walks exactly that many records from the declared offset, advancing by
46 + fileNameLength + extraFieldLength + fileCommentLengthand validating thesignature and the remaining length at each step.
must be at least
46 * entryCount, and it is bounded at 16 MiB so a hostile orcorrupt EOCD can't ask us to buffer the sentinel 4 GiB.
getCDBufferschanged signature. It's a public method onZipReaderbutZipReaderis not re-exported from any package entry point (
lib/tdf3/src/utils/index.tsonly),so this isn't a published API break.
Post-review: the 1 KiB tail read can contain the EOCD but not the zip64 locator that
sits 20 bytes before it, when a comment of about 1 KiB pushes the EOCD toward the start
of the tail. When the EOCD needs zip64 and the locator could have been cut off, the
reader now re-reads the maximum window and finds the EOCD again.
Finding 2 — ZIP64 extra field ignored unless
versionNeededToExtract >= 45Dropped the version gate in
parseCDBuffer. APPNOTE 4.5.3 does not condition thevalidity of a ZIP64 extended information extra field on the version-needed-to-extract
byte; the sentinel values in the fixed-size fields are what select it. The gate meant
a conformant producer writing a ZIP64 extra with a lower declared version had it
silently dropped, leaving
0xffffffffto flow intobyteStart/byteEndarithmeticas if it were a real number.
sliceExtraFieldsalready did the right thing (iterates the whole extra-field area,rejects conflicting duplicate header IDs, bounds-checks
dataSize, reads the ZIP64fields in APPNOTE order) and is unchanged. Also added a length guard to
parseCDBufferso a record shorter than the 46-byte fixed prefix is rejected rather than parsed out
of a short buffer.
Post-review: in a zip64 archive, an entry that carries a
0xffffffffsentinel but hasno ZIP64 extra field to resolve it is now rejected with
InvalidFileError. Previouslythe sentinel would have been used as a literal offset or size.
parseCDBuffertakes anarchiveIsZip64flag for this. Non-zip64 archives may legitimately hold a literal0xffffffff, so they keep the old behaviour.Finding 4 — 32-bit shift on a potentially large size in an error path
(cdObj.uncompressedSize >> 10)becameMath.floor(cdObj.uncompressedSize / 1024).>>coerces to signed 32 bits, so a 2 GiB manifest used to be reported as-2,097,152 KiB. Error-message only.Tests
lib/tests/mocha/unit/zip.spec.tsgains abuildZiphelper that assembles completein-memory archives with
ZipWriter, so the reader is exercised end to end rather thanagainst hand-rolled record fragments. New coverage:
0x02014b50— the false-positive casecentral directory record and inside a full archive)
versionNeededToExtractforced to 20and with only an unrelated extra field, and accepted in a non-zip64 one
The
0x02014b50test was verified against the pre-change reader: with the old backwardscanner restored,
getCentralDirectory()returns four entries(
['', '', '0.manifest.json', '0.payload']) instead of two, the two empty-named onesbeing payload bytes misread as central directory records. It passes with the new
reader.
Cross-SDK interop
The shared interop harness is DSPX-4592 and is already built in
opentdf/testsonbranch
DSPX-4592-java-underflow. It needs nothing from this PR.Summary by CodeRabbit