fix(config): ignore non relative return paths on the maintenance redirect - #3817
fix(config): ignore non relative return paths on the maintenance redirect#3817cnYui wants to merge 3 commits into
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Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughBoth web applications now validate maintenance-page return URLs. Same-origin paths retain their pathname, query, and hash. Absolute, protocol-relative, and backslash-prefixed URLs redirect to the site root. Tests cover these cases. ChangesReturn URL validation
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Medium Assessment against linked issues
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The maintenance return redirect validation has no remaining identified merge-blocking risk. ✨ Finishing Touches🧪 Generate unit tests (beta)
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apps/deploy-web/src/middleware.spec.tsESLint skipped: missing config or dependency (missing-dependency). The ESLint configuration references a package that is not available in the sandbox. apps/deploy-web/src/middleware.tsESLint skipped: the matched ESLint configuration already failed (missing-dependency). Comment |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3817 +/- ##
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- Coverage 81.12% 80.53% -0.59%
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Files 1227 1130 -97
Lines 33378 30878 -2500
Branches 8156 7662 -494
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+ Misses 5575 5305 -270
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…rect Both maintenance middlewares handed the user controlled `return` query param straight to NextResponse.redirect, so /maintenance?return=<absolute url> issued a 307 to an arbitrary origin. Resolve the value against the request URL and fall back to "/" unless it stays on the same origin. Fixes akash-network#2564 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Done — signed the commit and force-pushed. The branch head is now |
please resolve the conflicts as well |
…aintenance-return-path # Conflicts: # apps/deploy-web/src/middleware.spec.ts
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Done — conflicts resolved and pushed (branch head I merged the latest Verified locally (
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Inline comments:
In `@apps/deploy-web/src/middleware.ts`:
- Line 92: Prevent the same-origin redirect flow from returning a
protocol-relative path: update the return URL handling around the origin
validation and NextResponse.redirect call to pass the validated URL object
directly, or construct the fallback with new URL("/", request.url) without
reparsing a // pathname. Add a regression test covering
http://localhost//evil.example/phish and verify it redirects to the local root
rather than evil.example.
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…return path A return param like `http://host//evil.example/phish` passes the origin check but its pathname is `//evil.example/phish`; returning that string and re-parsing it against the request URL treats it as a protocol-relative URL and redirects to an external origin (CWE-601). Return the validated same-origin URL object and pass it directly to NextResponse.redirect, so the pathname is never re-parsed. Adds a regression test. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Good catch by the automated review — this was a real bypass. A same-origin absolute return like Fixed in Verified locally (apps/deploy-web):
Commit is SSH-signed / GitHub-Verified. |
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Why
Fixes #2564
getReturnPathtakes the user-controlledreturnquery param, decodes it, and hands the raw value toNextResponse.redirect(new URL(returnPath, request.url), 307). The surroundingtry/catchonly guardsdecodeURIComponentthrowing on malformed input — nothing checks that the value is a relative path.So whenever
MAINTENANCE_MODEis not"true"(i.e. normal production),/maintenance?return=<absolute url>issues a 307 off the console origin. Verified against production:stats.akash.networkreturns exactly the same three responses —apps/stats-web/src/middleware.tscarries an identicalgetReturnPath.What
getReturnPathnow resolves the decoded value againstrequest.urland keeps it only when it stays on the request's own origin, falling back to"/"otherwise. It returns the resolvedpathname + search + hashinstead of the raw string, so the value the caller feeds back intonew URL(returnPath, request.url)can no longer carry an origin at all.Applied identically to
apps/deploy-web/src/middleware.tsandapps/stats-web/src/middleware.ts. Thetry/catchand both call sites are untouched.Going through the URL parser rather than string prefix checks is deliberate:
searchParams.get()already percent-decodes once beforedecodeURIComponentruns again, so a prefix test has to account for double encoding (?return=%252F%252Fexample.com), and/\example.comis folded to//example.comby WHATWG URL and escapes the origin as well.Nothing changes for the only value the maintenance branch itself writes —
request.nextUrl.pathname + request.nextUrl.search, which always starts with a single/.Tests
Extended
apps/deploy-web/src/middleware.spec.tsand added a mirrorapps/stats-web/src/middleware.spec.ts(stats-web had no middleware spec). Four cases each: relative path preserved, absolute URL ignored, protocol-relative ignored, backslash-prefixed ignored.With the middleware change reverted but the specs kept, the three attack cases fail in both apps:
With the fix in place (running the
test:unitscripts' vitest invocation directly, since I am on Windows and theNODE_ENV=test ...prefix is not valid in cmd.exe):eslintandprettier --checkare clean on all four files (lint-staged also ran them on commit), andtsc --noEmitpasses inapps/stats-web.tsc --noEmitinapps/deploy-webalready reports 94 errors onmain, all in unrelated*.spec.tsx/tests/files and none in anything touched here.On not reusing
getValidInternalReturnToUrlapps/deploy-web/src/utils/getValidInternalReturnToUrlguards the client-sidereturnToflow against the same class of bug, but it does not fit this call site: it iswindow-dependent and middleware has nowindow(without one it rejects every absolute URL, including same-origin ones), it lives in deploy-web so stats-web cannot import it, and its relative branch (startsWith("/") && !startsWith("//")) returns/\example.com/phishunchanged, whichnew URL(value, request.url)then resolves tohttp://example.com/phish.That leaves the guard duplicated across the two middlewares, which already duplicate
getReturnPathandsetContentSecurityPolicyHeadersverbatim. Happy to extract a shared helper intopackages/if you would rather have one home for both — I kept the change local so it stays reviewable as a fix.🤖 Generated with Claude Code
Summary by CodeRabbit
Bug Fixes
Tests