fix(devtools): harden RPC surface against traversal, spoofing, and dead auth UI - #1086
fix(devtools): harden RPC surface against traversal, spoofing, and dead auth UI#1086antfubot wants to merge 3 commits into
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…ad auth UI - writeStaticAssets: resolve folder/path against a fixed publicDir and verify containment against publicDir instead of a string-concatenated, unchecked base, closing a path-traversal escape (e.g. folder='/../..'). - frame-nav: validate postMessage sender origin/source and reply with an explicit targetOrigin instead of '*', preventing cross-origin frames from reading the tab manifest or driving navigation. - Remove the requireAuth tab gate and Authorize UI, which were permanently no-ops (isDevAuthed hardcoded true) and falsely implied protection that Vite DevTools' own connection auth actually provides.
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughClient-side authorization prompts and authentication gating were removed from module and overview pages. The Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This updates the build tooling dependency to skills-npm 1.2.1 and permits that version through the release-age policy. The resolved dependency version is aligned, with no outstanding merge-readiness risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 28.57% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 4 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@packages/devtools/src/server-rpc/assets.ts`:
- Line 109: Update the containment checks in writeStaticAssets to use
platform-aware relative-path validation: compute the path relative to publicDir,
reject absolute results and paths beginning with .. plus a separator boundary,
and preserve acceptance of publicDir itself and valid descendants on Windows and
POSIX.
- Line 115: Update the asset write path around the finalPath containment check
to canonicalize the target parent with realpath, reject any canonical parent
outside the canonical public directory, and reject an existing symbolic-link
target before fsp.writeFile. Add a regression test covering a linked directory
that points outside publicDir.
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📒 Files selected for processing (6)
packages/devtools-kit/src/_types/custom-tabs.tspackages/devtools/client/composables/frame-nav.tspackages/devtools/client/pages/modules/custom-[name].vuepackages/devtools/client/pages/modules/overview.vuepackages/devtools/src/server-rpc/assets.tspackages/devtools/test/write-static-assets.test.ts
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- packages/devtools/client/pages/modules/overview.vue
- packages/devtools/client/pages/modules/custom-[name].vue
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Lexical path containment doesn't stop fsp.writeFile from following an existing symlink (a linked directory, or the target file itself) out of the public directory. Canonicalize the nearest existing ancestor with realpath and reject it if it escapes publicDir, and reject writing to an existing symlink target outright. Addresses a CodeRabbit review finding on nuxt#1086.
…1.2.1 - write-static-assets.test.ts: narrow the possibly-undefined array element before passing it to fsp.readFile (noUncheckedIndexedAccess), fixing the one new typecheck error introduced by this branch (all other CI failures are pre-existing on main). - skills-npm 1.2.0 -> 1.2.1: this release drops the gray-matter dependency entirely, closing the code-injection path where a fork PR's SKILL.md `---js` frontmatter could eval() during the root postinstall scan.
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What
Fixes three issues found in a security review of the DevTools RPC/client surface:
writeStaticAssetspath traversal:baseDirwas computed by string-concatenating the caller-controlledfolderontodir.publicbefore the containment check ran, sofolder='/../..'escaped the public directory entirely and the subsequentstartsWith(baseDir)check passed trivially. Nowfolder/pathare always resolved against the fixedpublicDirwith leading slashes stripped (so an absolute-looking path can't escape viapath.resolve's override-with-absolute-path behavior), and containment is verified againstpublicDir/baseDirwith a proper path-boundary check.frame-navpostMessage spoofing: the client's iframe nav shim acceptedpostMessagefrom any origin and replied withtargetOrigin: '*', letting any page that iframes the DevTools client URL read the tab manifest and drive navigation. It now validatesev.origin/ev.sourceagainst the host origin (the frame is always embedded same-origin by the dev server) and replies with an explicittargetOrigin.requireAuthtab gate:isDevAuthedwas permanently hardcoded totrue, sorequireAuth: truetabs and the "Authorize" prompt never gated anything — they just implied a protection that isn't there. Since real authorization now happens via Vite DevTools' own connection auth (per the existing deprecation notices ondev-auth.ts), the no-op gate and prompt are removed and therequireAuthfield is documented as deprecated.Testing
Added unit tests for
writeStaticAssetscovering: normal writes, afoldertraversal attempt, apathtraversal attempt, and an absolute-lookingpathbeing safely treated as relative.pnpm test(lint + unit) passes.This PR was created with the help of an agent.