security: remove NIP-98 signed event cache (replay prevention)#18
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security: remove NIP-98 signed event cache (replay prevention)#18jjohare wants to merge 1 commit into
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Remove the nip98Cache Map and all caching logic. The cache reused signed events for identical URL+method+bodyHash within 60 seconds, causing the same event ID to be sent multiple times. Servers with replay protection reject duplicate event IDs, and the predictable cache keys create an additional attack surface. NIP-98 event creation is computationally cheap (~1ms with noble/secp256k1), so caching provides no meaningful benefit. Co-Authored-By: claude-flow <ruv@ruv.net>
melvincarvalho
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May 13, 2026 06:52
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Folded into #22 — a single CI-green, adversarially-reviewed PR that consolidates this branch with the other security fixes plus NIP-44 and residual gap-fixes (exact-host trust, NIP-98 nonce, signEvent self-verify, honest provider surface, auto-sign default OFF). Suggest reviewing/merging #22; this can be closed in its favour. |
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jjohare
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Consolidated hardening of the Podkey key-holding signer: brings seven in-flight security/feature branches plus residual gap-fills, a polished CSP-clean UI, a CI build/test/lint gate, and a 133-test suite into one reviewable PR. The fix set was independently re-derived from a full audit of the extension and every item below was verified fixed *in the final tree* by an adversarial review pass (not just claimed). **Supersedes** (folded in here; safe to close in favour of this PR): #12, #14, #17, #18, #19, #20, #21. ## Security posture — before → after | Area | Before | After | |---|---|---| | Consent | Auto-approve everything (`showPermissionPrompt` hard-returned `true`) | **Explicit per-origin consent** popup that blocks on the user's decision; closing or 60s timeout denies | | Key at rest | `storage.local` (persisted plaintext) | **`storage.session` only** (in-memory, cleared on browser close); raw key never crosses to the page | | Crypto | A fake `crypto-browser.js` in the tree (`pubkey = sha256(privkey)`) | Deleted; **real `@noble` crypto** only, with `signEvent` schnorr self-verify before return | | NIP-98 | Signed-event cache → byte-identical id → replayable | **Fresh per-token 16-byte nonce**, redirect-aware `u` tag, page-side body-hash binding | | Solid-host trust | Substring match (`inrupt.net.evil.com` accepted) | **Exact-host match**, case-insensitive; lookalikes rejected | | Interception | Double fetch/XHR interception + double 401-retry | **Single interception path**, one retry | | Message channel | Page could inject arbitrary fields / origin / `privateKey` | Content script **whitelists 4 message types, forwards only safe fields, enforces the real origin** | | Provider surface | Advertised `nip04`/`getRelays` that throw / return `{}` | **Honest**: `getPublicKey`, `signEvent`, `nip44.{encrypt,decrypt}` only | | UI | Inline scripts + `innerHTML` XSS sinks | **CSP `script-src 'self'`**; all DOM via `textContent`/`createElement` | | Auto-sign | Defaulted **ON** (first-run silent trust + NIP-98 mint) | Defaults **OFF** — silent trusted-origin Solid signing and NIP-98 auto-trust are strictly opt-in | ## Notes for review - **Consent timeout:** `approve.js` actively sends `approved:false` + closes at the 60s mark (one-shot `decisionSent` guard) so the visible countdown is truthful; the background `chrome.windows` 60s timer remains a backstop. If you'd prefer the popup stay passive and let the background own the timeout, that is the single behavioural line to reconsider — everything else on the UI is restyling. - The page-context `nip98-interceptor.js` still duplicates a couple of `auth-header-utils.js` helpers because page context can't ESM-import the module; intentional, tracked separately. ## Verification - `npm run build` ✓ · `npm test` → **133 pass / 0 fail** ✓ · `npm run lint` → **0 errors** (now `no-unused-vars: error`) ✓ - New `.github/workflows/ci.yml` runs build → test → lint on every PR and push to `main`. 🤖 Generated by Claude Code
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Summary
nip98CacheMap and all associated caching logic fromsrc/background.jsurl:method:bodyHash) create an additional attack surfaceTest plan
Co-Authored-By: claude-flow ruv@ruv.net