fix(cachekitio): reject reserved cache-key segments in request path (CWE-22, LAB-2877) - #118
fix(cachekitio): reject reserved cache-key segments in request path (CWE-22, LAB-2877)#11827Bslash6 wants to merge 6 commits into
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…sal (CWE-22, LAB-2877) A cache key of exactly '.' or '..' triggers WHATWG URL Standard dot-segment removal in fetch/undici, causing the authenticated request to escape the /v1/cache/ prefix. Python's fix (encode to %2E) does not work in JS because WHATWG treats %2E identically to '.' for path normalization. Reject these keys with ConfigurationError instead — fail-fast over silent misdirection. - Add shared encodeKey() replacing 5 raw encodeURIComponent() call sites - 43 tests: repro, WHATWG %2E proof, rejection, pathname assertions, round-trip - SECURITY.md: document the CWE-22 encoding note
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 4 reviews per hour. WalkthroughThe change adds shared CachekitIO key encoding and synchronous validation. Reserved path segments and malformed UTF-16 now raise ChangesCache key path safety
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to This change prevents unsafe cache-key URL paths and rejects invalid keys before requests are sent. No concrete current-head merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant CacheCore
participant CachekitIO
participant Fetch
CacheCore->>CachekitIO: validateKey(key)
CachekitIO-->>CacheCore: accept or ConfigurationError
CacheCore->>CachekitIO: build encoded cache URL
CachekitIO->>Fetch: request encoded URL
Fetch-->>CachekitIO: response
CachekitIO-->>CacheCore: cache operation result
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✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
In `@packages/cachekit/src/backends/cachekitio.ts`:
- Line 230: Preserve ConfigurationError thrown by encodeKey instead of wrapping
it as BackendError: update the catch paths for get, set, delete, and exists in
packages/cachekit/src/backends/cachekitio.ts (line 230), acquireLock and
releaseLock in packages/cachekit/src/backends/cachekitio-lockable.ts (lines 48
and 79), and getTTL and refreshTTL in
packages/cachekit/src/backends/cachekitio-ttl.ts (lines 40 and 70) to rethrow it
directly; add regression tests through the core, lock, and TTL operations.
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SECURITY.mdpackages/cachekit/src/backends/cachekitio-lockable.tspackages/cachekit/src/backends/cachekitio-path-encoding.test.tspackages/cachekit/src/backends/cachekitio-ttl.tspackages/cachekit/src/backends/cachekitio.ts
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The "no safe vector escapes /v1/cache/ prefix" test re-asserts what every individual AC-2 parameterized test already checks. Removed per catchphrase-agent finding in expert-panel review.
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…gurationError unwrapped (LAB-2877) Protocol spec/saas-api.md § Cache-Key Path Encoding rule 2 (protocol#61) reserves `.`, `..`, `health`, `ttl`, `lock`: the dot segments collapse under WHATWG parsing (client-side in fetch, server-side in the worker, `%2E` included) and the three route tokens collide with live routes at the /v1/cache/ level. encodeKey now rejects all five, case-sensitive and exact, matching the SaaS router and the cachekit-rs twin (cachekit-rs#76). URL construction moves above each network `try` (core get/set/delete/exists, TTL getTTL/refreshTTL, lock acquire/release) so the ConfigurationError reaches the caller instead of being wrapped as a BackendError (CodeRabbit finding on cachekitio.ts:230). The ttl wrapper already hoisted validateTtl for the same reason; this follows that pattern. Tests move to the protocol lane and drive the real backend classes through a fetch spy, asserting on the WHATWG-parsed pathname that fetch received rather than on the template string. Vectors are the vendored protocol/test-vectors/path-encoding.json v1.0.0 (15 rows, 5 reject).
…utor (expert panel, LAB-2877) Panel findings applied (high stakes, post-spec): - Backend.validateKey capability, mirroring validateTtl: CachekitIOCore implements it via encodeKey, the TTL/Lockable/combined wrappers forward it, and CacheImpl calls it synchronously in get/set/delete/exists before run(). Without it the ConfigurationError fired inside the executor on the public createCache path: retried maxAttempts times, counted by the circuit breaker (five reserved keys in 60s opened it and blackholed legitimate keys), then swallowed by degradation into a silent miss / a set() that never stored. - encodeKey wraps encodeURIComponent: a lone surrogate threw a raw URIError, which the URL hoist had moved outside the catch that used to wrap it. Every SDK error stays a CachekitError. - Doc fix: ts is decode-equivalent to cachekit-rs, not byte-identical (urlencoding::encode escapes !*'() that encodeURIComponent leaves raw). - Error message derives the token list from RESERVED_SEGMENTS; SECURITY.md no longer says a percent-encoded key is "sent unchanged". - Tests: dropped the tautological not-BackendError assertion, the standalone round-trip block (the decode is asserted on the real wire path x8 ops), the message-regex pin and the over-long near-miss list; the wire matrix asserts the exact pathname. Added validateKey coverage on all three backend classes, the lone-surrogate case, and a cache.test.ts regression beside LAB-239's.
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27Bslash6
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Inline comments:
In `@packages/cachekit/src/backends/cachekitio.ts`:
- Line 37: Update CachekitIOCore.validateKey to reject an empty key before
checking RESERVED_SEGMENTS, ensuring cacheUrl is never constructed for the
collection path. Preserve the existing reserved-segment validation for non-empty
keys.
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SECURITY.mdpackages/cachekit/src/backends/cachekitio-factory.tspackages/cachekit/src/backends/cachekitio-lockable.tspackages/cachekit/src/backends/cachekitio-ttl.tspackages/cachekit/src/backends/cachekitio.tspackages/cachekit/src/backends/types.tspackages/cachekit/src/cache-core.tspackages/cachekit/src/cache.test.tspackages/cachekit/test/protocol/fixtures/path-encoding.jsonpackages/cachekit/test/protocol/path-encoding.protocol.test.ts
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…22, LAB-2877)
encodeKey('') returned '' (not a reserved segment), so cacheUrl('') built
/v1/cache/ — the collection path, not a keyed resource — the same dot-segment
escape class RESERVED_SEGMENTS guards, reached without hitting it. Guard the
empty key up front in encodeKey, the single chokepoint both validateKey and
cacheUrl route through, so every operation rejects it synchronously with a
ConfigurationError and never calls fetch.
Addresses CodeRabbit finding on cachekitio.ts validateKey.
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…ec rule-2 vector Expert-panel [MIN]: the block title claimed spec rule-2 provenance while its own comment disclaimed the empty key as a fixture vector — an internal contradiction. Retitle to name it a local precondition guard and note the cross-SDK fixture parity (empty-key reject row in protocol/test-vectors/path-encoding.json) as tracked follow-up. No behaviour change.
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Expert-panel review — empty-key guard (crypto/protocol gate, cache-key path format)Ran the mandatory expert panel (high stakes) on the empty-key guard added here ( bug-hunter — NO FINDINGS. Traced all 8 request builders: the throw fires before security — NO FINDINGS. catchphrase — NO CUTS. The per-operation test loop and platform-premise test are the right coverage for a CWE-22 fix on a public SDK, mirroring the existing reserved-segment block. code-craftsman — 1 applied, 1 deferred:
Net: the ts hole is closed and enforced across all 8 operations; the cross-SDK contract propagation is tracked separately. |
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Summary
Reject the five reserved cache-key path segments —
.,..,health,ttl,lock— client-side in the CachekitIO backend, before any URL is built, per protocolspec/saas-api.md§ Cache-Key Path Encoding rule 2 (cachekit-io/protocol#61). CWE-22 defence-in-depth, and cross-SDK parity with cachekit-rs (cachekit-io/cachekit-rs#76).encodeKey()replaces the five rawencodeURIComponent(key)sites (core GET/PUT/DELETE/HEAD, TTL GET/PATCH, lock POST/DELETE) and throwsConfigurationErrorfor a reserved segment or malformed UTF-16 (lone surrogate). Every other key is exactlyencodeURIComponent(key).try, so theConfigurationErrorreaches the caller unwrapped instead of being re-thrown asBackendError(CodeRabbit finding). Same patternrefreshTTLalready used forvalidateTtl.Backend.validateKey?capability, mirroringvalidateTtl:CachekitIOCoreimplements it, the TTL / Lockable / combined wrappers forward it, andCacheImplcalls it synchronously inget/set/delete/existsbefore the reliability executor. Without it the publiccreateCache(...).get('health')path retried the deterministic error, counted it against the circuit breaker (five reserved keys in 60 s opened the breaker and blackholed legitimate keys), then degraded it into a silent miss / no-store (expert-panel finding).test/protocol/path-encoding.protocol.test.ts, 148 tests) and drive the realCachekitIOCore/TTLCachekitIO/LockableCachekitIOthrough a fetch spy, asserting on the WHATWG-parsednew URL(url).pathnamethatfetchreceived. Vectors are the vendoredprotocol/test-vectors/path-encoding.jsonv1.0.0 (15 rows, 5 reject). Acache.test.tsregression pins thevalidateKeypre-flight beside the existingvalidateTtlone.Why reject rather than encode (AC-0 repro)
.is RFC-3986 unreserved, soencodeURIComponent('..') === '..', and the WHATWG parser behindfetchremoves the dot segment before the request leaves the process:The SaaS worker parses the request URL with WHATWG
new URL()too, so%2E%2Ecollapses server-side even from an RFC-3986 client (spec evidence:GET /v1/cache/%2E%2E/healthreturns the health payload). No wire form of./..reaches the key validator from any client, so the spec mandates client-side rejection on every stack.health,ttl,lockare route tokens at the same level:/v1/cache/healthis the health endpoint, and a trailingttl/lockselects a sub-resource with an empty key. The SaaS router matches them exactly and case-sensitively (apps/cache/src/index.ts:509,655), so only the lowercase words are reserved;HEALTH,ttls,a:..,..atransmit unchanged.Cross-SDK position (AC-4)
encode_key. Same behaviour; ts and rs are decode-equivalent, not byte-identical:urlencoding::encodeescapes! * ' ( )whereencodeURIComponentleaves them raw (spec rule 4, fixtureencoded_alternates). The SaaS decodes both to the same key, and every key the server accepts is drawn from[A-Za-z0-9_.:-], on which all encoders agree, so canonical and interop keys are byte-identical on the wire across SDKs._encode_key@f000ba3) still rewrites./..to%2E, which only moves the collapse to the server; a py follow-up ticket tracks the switch to rejection. For every non-reserved key, py and ts are decode-equivalent as above.Test plan
%2Ecollapse undernew URL(), pinned as the design premiseencodeKeyrejects the five reserved segments; identity withencodeURIComponentfor every transmittable vector and for near-misses/v1/cache/; 8 operations × 5 reserved keys reject withConfigurationErrorand never callfetchvalidateKeypre-flight regression throughcreateCache(cache.test.ts)Local: eslint, prettier, tsc clean; 148/148 protocol tests; full suite 899 pass with 16 failures confined to key-rotation / bin-envelope tests that need the not-yet-published core-ts 0.1.3 native binding (no cargo in this workdir, so the 0.1.2 npm binary stood in).
Closes LAB-2877
Summary by CodeRabbit
New Features
Bug Fixes
Tests