fix(jans-cedarling): Recursive directory traversal and add size to StatusList Zlib decompression to prevent zip bombs by haileyesus2433 · Pull Request #14856 · JanssenProject/jans

haileyesus2433 · 2026-08-25T06:22:26Z

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Description

Target issue

closes #14821 and #14822

Implementation Details

Test and Document the changes

Static code analysis has been run locally and issues have been fixed
Relevant unit and integration tests have been added/updated
Relevant documentation has been updated if any (i.e. user guides, installation and configuration guides, technical design docs etc)

Please check the below before submitting your PR. The PR will not be merged if there are no commits that start with docs: to indicate documentation changes or if the below checklist is not selected.

I confirm that there is no impact on the docs due to the code changes in this PR.

Summary by CodeRabbit

Bug Fixes
- Added safeguards against excessively deep policy directory scanning.
- Limited decompressed status list data to 10 MB to prevent oversized payloads from affecting processing.
- Improved error reporting when policy traversal or status list decompression exceeds configured limits.

PolicyStoreError Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

Prevent stack overflows by restricting directory traversal depth to 64 levels. Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

Add a size limit to the Zlib decoder to prevent zip-bomb attacks and potential out-of-memory errors. Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

violation Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

mo-auto · 2026-08-25T06:22:43Z

✅ Snyk checks have passed. No issues have been found so far.

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✅	Open Source Security	0	0	0	0	0 issues

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coderabbitai · 2026-08-25T06:23:44Z

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jans-cedarling/cedarling/src/jwt/status_list.rs

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Changes

Policy store traversal limit

Layer / File(s)	Summary
Depth-limited Cedar loading `jans-cedarling/cedarling/src/common/policy_store/errors.rs`, `jans-cedarling/cedarling/src/common/policy_store/loader.rs`, `jans-cedarling/cedarling/src/common/policy_store/loader_tests.rs`	Cedar policy loading limits recursive directory traversal to 64 levels and returns `MaxDepthExceeded` for deeper paths. A regression test covers nested directories.

Status-list decompression limit

Layer / File(s)	Summary
Bounded status-list parsing `jans-cedarling/cedarling/src/jwt/status_list/error.rs`, `jans-cedarling/cedarling/src/jwt/status_list.rs`	Status-list parsing caps decompressed data at 10 MB and returns `DecompressedSizeExceeded` when additional data remains. A regression test covers oversized payloads.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to aa7ac

The change adds localized limits for directory traversal and compressed status-list processing without introducing an actionable merge-blocking risk. It is merge-ready after normal checks and review.

Suggested reviewers: 0xtinkle, olehbozhok

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies both principal fixes: a recursion-depth limit for policy directory traversal and a decompression-size cap for StatusList Zlib data.
Description check	✅ Passed	The description follows the template, identifies issues `#14821` and `#14822`, marks static analysis and tests complete, and confirms no documentation impact. The optional Implementation Details section i…
Linked Issues check	✅ Passed	The requirements in [`#14821`] are met. StatusList decompression now has a 10 MB cap, returns DecompressedSizeExceeded when the limit is exceeded, and includes a regression test. The recursion-depth fix…
Out of Scope Changes check	✅ Passed	The changes are limited to the two stated security fixes: bounded policy-directory recursion and bounded StatusList decompression. The added errors and regression tests directly support those fixes.
Docstring Coverage	✅ Passed	Docstring coverage is 87.50% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 5 files.

Full details: Description check

Explanation

The description follows the template, identifies issues #14821 and #14822, marks static analysis and tests complete, and confirms no documentation impact. The optional Implementation Details section is empty, but the description remains sufficiently complete.

Full details: Linked Issues check

Explanation

The requirements in [#14821] are met. StatusList decompression now has a 10 MB cap, returns DecompressedSizeExceeded when the limit is exceeded, and includes a regression test. The recursion-depth fix also matches the stated PR objective for #14822.

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Resolve merge conflict in branch jans-cedarling-14821/2

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Actionable comments posted: 1

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Inline comments:
In `@jans-cedarling/cedarling/src/jwt/status_list.rs`:
- Around line 377-380: Add a descriptive failure message to the matches
assertion for result in the oversized-payload test, explicitly stating that an
oversized payload must return DecompressedSizeExceeded. Keep the existing
error-pattern check unchanged.

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Reviewing files that changed from the base of the PR and between f89b5ff and beb6357.

📒 Files selected for processing (5)

jans-cedarling/cedarling/src/common/policy_store/errors.rs
jans-cedarling/cedarling/src/common/policy_store/loader.rs
jans-cedarling/cedarling/src/common/policy_store/loader_tests.rs
jans-cedarling/cedarling/src/jwt/status_list.rs
jans-cedarling/cedarling/src/jwt/status_list/error.rs

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Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

dagregi

Maybe we could turn the constants into a bootstrap property?

olehbozhok · 2026-08-28T13:29:40Z

Maybe we could turn the constants into a bootstrap property?

I think 64 is more than enough. We don't need to add this to the bootstrap property for now.
10 MB for the status list is more than enough.

…th test Signed-off-by: Oleh Bozhok <6554798+olehbozhok@users.noreply.github.com>

Signed-off-by: Oleh Bozhok <6554798+olehbozhok@users.noreply.github.com>

haileyesus2433 added 5 commits August 25, 2026 02:13

feat(jans-cedarling): add MaxDepthExceeded error variant to

9f71b29

PolicyStoreError Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

feat(jans-cedarling): Add DecompressedSizeExceeded error variant

e6492f2

Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

feat(jans-cedarling): Limit directory recursion depth in policy loader

c1b125d

Prevent stack overflows by restricting directory traversal depth to 64 levels. Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

feat(jans-cedarling): Limit decompressed status list size to 10MB

6a43189

Add a size limit to the Zlib decoder to prevent zip-bomb attacks and potential out-of-memory errors. Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

feat(jans-cedarling): add test for max directory recursion depth

f925248

violation Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

haileyesus2433 added this to the 2.4.0 milestone Aug 25, 2026

haileyesus2433 requested review from dagregi and olehbozhok August 25, 2026 06:22

haileyesus2433 self-assigned this Aug 25, 2026

mo-auto added comp-jans-cedarling Touching folder /jans-cedarling kind-bug Issue or PR is a bug in existing functionality labels Aug 25, 2026

Merge branch 'main' into jans-cedarling-14821/2

beb6357

coderabbitai Bot requested changes Aug 25, 2026

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Comment thread jans-cedarling/cedarling/src/jwt/status_list.rs Outdated

chore(jans-cedarling): improve error message in status list test

0368bee

Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

coderabbitai Bot previously approved these changes Aug 25, 2026

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chore(jans-cedarling): fix clipy issues

f9fd9f1

Signed-off-by: haileyesus2433 <haileyesusbe@gmail.com>

haileyesus2433 dismissed coderabbitai[bot]’s stale review via f9fd9f1 August 25, 2026 07:06

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olehbozhok added 2 commits August 28, 2026 16:51

refactor(jans-cedarling): simplify path construction in recursion dep…

3830531

…th test Signed-off-by: Oleh Bozhok <6554798+olehbozhok@users.noreply.github.com>

refactor(jans-cedarling): rename shadowed list var to compressed

5038878

Signed-off-by: Oleh Bozhok <6554798+olehbozhok@users.noreply.github.com>

olehbozhok dismissed stale reviews from dagregi and coderabbitai[bot] via 5038878 August 28, 2026 13:58

coderabbitai Bot previously approved these changes Aug 28, 2026

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docs(jans-cedarling): clarify decompression limit is a hard safety cap

aa7ac25

Signed-off-by: Oleh Bozhok <6554798+olehbozhok@users.noreply.github.com>

olehbozhok dismissed coderabbitai[bot]’s stale review via aa7ac25 August 28, 2026 14:12

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fix(jans-cedarling): Recursive directory traversal and add size to StatusList Zlib decompression to prevent zip bombs - #14856

fix(jans-cedarling): Recursive directory traversal and add size to StatusList Zlib decompression to prevent zip bombs#14856
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