Mars OAuth redirect_to bypasses resolveSiteOrigin() + 3 uncanonicalized prod hosts (TERRA-20-derived)
TERRA-20-derived finding (2026-08-16): 3 non-canonical hosts serve live Mars prod (bare + 2 suffixed .vercel.app aliases), no redirects. OAuth login (login-button.tsx, login-client.tsx) builds redirect_to from window.location.origin instead of resolveSiteOrigin() -- bypasses the site-origin validator. Verified via GoTrue redirect differential: currently a SILENT FALLBACK (aliases collapse to Site URL, no session ever minted on wrong host) not live exposure -- but fails invisibly and goes live if an alias is ever allow-listed or Site URL changes. Fix sequence (audit-reviewed): (1) 308 redirect bare alias -> canonical [BLOCKED on Elazar, prod config write, PATCH ready]; two suffixed hosts need a separate mechanism, not a per-domain redirect. (2) route both login call sites through a shared canonicalCallbackUrl() helper, Class-A audit-approved design, PARKED until (1) lands and is verified (wrong order breaks in-flight PKCE logins). Recorded in mars-unverifiable-state.md: Supabase redirect allow-list membership-testing done (not allow-listed); enumeration still needs a PAT.
Activity
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Elazar ruling 2026-08-22: nobody is going to add a URL to the Supabase redirect allow-list, so the exposure trigger does not fire and this stays inert. DEPRIORITIZED P1 -> P4 on his call; NOT closed, because the finding is still true and the second trigger (Site URL change) is not an allow-list edit. Step (a), the 308 redirect config write on the bare alias, is DECLINED for now - so step (b), routing both login call sites through canonicalCallbackUrl(), stays parked: doing it while the aliases still serve turns a silent fallback into a hard login outage (PKCE verifier is origin-scoped). Offered but not authorized: a warn-tier log when a login arrives on a non-canonical host - no config write, no login risk, makes the silent failure observable.
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Elazar ruling 2026-08-22: nobody is going to add a URL to the Supabase redirect allow-list, so the exposure trigger does not fire and this stays inert. DEPRIORITIZED P1 -> P4 (someday) on his call; NOT closed, because the finding is still true and the second trigger (Site URL change) is not an allow-list edit. Step (a), the 308 redirect config write on the bare alias, is DECLINED for now - so step (b), routing both login call sites through canonicalCallbackUrl(), stays parked: doing it while the aliases still serve turns a silent fallback into a hard login outage (PKCE verifier is origin-scoped). Offered but NOT authorized: a warn-tier log when a login arrives on a non-canonical host - no config write, no login risk, makes the silent failure observable.
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DEFERRED by Elazar 2026-08-22 ('defer this, is stupid'). Already at P4. No code change, no config change standing. What was tried and REVERTED in the same turn: I enabled Vercel Deployment Protection (ssoProtection=prod_deployment_urls_and_all_previews) and measured it - it protected the per-DEPLOYMENT generated URLs (302) but NOT the two project-domain aliases (mars-evolutiva-pensanta-com.vercel.app, -git-main-...), which kept serving 200. Canonical was unaffected throughout. Turned it back OFF and re-probed: all hosts 200, exact prior state restored. Reason for reverting rather than leaving it: Vercel invokes the 14 cron jobs on the deployment URL, cron-bypasses-protection is a DOCUMENTED default I had not measured, and leaving an unverified risk running under a deferred item is how a silent breakage gets attributed to nothing. MEASURED FACTS worth keeping so nobody re-derives them: - The 3 .vercel.app hosts are PROJECT DOMAINS on prj_pEbLkaGOJouVO0LuJ3jZJLFX7mFl, not merely generated aliases - so they CAN carry a 308 redirect field, contrary to my earlier note that suffixed aliases 404 the PATCH (that note was about system aliases; correct for those, wrong for these). - deploymentType='all' is the only protection scope that would cover them, and it protects the canonical custom domain too = locks out every user. Never use it here. - No write path from this host for the redirect: the Vercel MCP has no domain tool, and ~/.local/share/com.vercel.cli/auth.json is EMPTY (no token). Dashboard or a token is required. - Elazar's standing position across two exchanges: nobody will add a URL to the Supabase redirect allow-list, so the exposure trigger does not fire. The .vercel.app hosts are auto-minted by Vercel and were never added by code or by anyone.
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coder-mars-ca / coder
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coder-mars-cc / coder
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coder03-mars-ca