HIBP integration
================
Opt-in (default OFF) password breach check via the Have I Been Pwned
range API. The full master / entry password never leaves the machine —
only the first 5 characters of its SHA-1 hash. HIBP returns ~500
candidate suffixes; the client matches its own suffix locally.
UI:
- New "Check passwords against breach database (HIBP)" toggle in
Settings → Security with an explainer hint about k-anonymity.
- On enable: background batch scan of all entries, results cached in
state.hibpResults keyed by entry id. Concurrency capped at 6 to
avoid hammering HIBP / hitting browser connection limits.
- Entry cards show a red "Pwned" chip + breach count in the tooltip
when count > 0. New i-alert icon added to the SVG sprite.
- Auto-scan triggered after every enterApp() when the toggle is on.
Functions added to app.js:
- sha1Hex(text) — crypto.subtle wrapper
- hibpCheckPassword(plaintext) — single-password check, returns count
- hibpCheckAllEntries() — batched scan over state.entries
The "Add-Padding: true" header is sent on every range request to defeat
the response-size side-channel (HIBP adds 800-1000 random extra entries
so an observer counting bytes can't narrow the prefix queried).
CSP tightening
==============
Audited the served HTML: zero <script> tags inline, only the external
js/app.js. Removed 'unsafe-inline' from script-src — real XSS defense.
Kept 'unsafe-inline' on style-src for now because index.html contains
inline style="" attributes and app.js calls element.style.cssText
extensively. Refactoring to CSS classes is a separate cleanup. Style
injection alone cannot execute code, so the residual risk is bounded
to visual manipulation in a single-user loopback app.
Added api.pwnedpasswords.com to connect-src as the only allowed
external origin (required by the HIBP feature above). Default still
'self' — everything else stays loopback.
Before:
script-src 'self' 'unsafe-inline';
style-src 'self' 'unsafe-inline';
connect-src 'self';
After:
script-src 'self';
style-src 'self' 'unsafe-inline';
connect-src 'self' https://api.pwnedpasswords.com;
Zaki
a45897c33d