b8fa321edd
Adds phishing-resistant 2nd factor via FIDO2 hardware keys (YubiKey etc.) and device biometrics (Touch ID, Windows Hello, etc.). Reuses the existing B-2.5 TOTP gate so a passkey is a 3rd valid option on /2fa/verify, alongside TOTP code and recovery code. Post-login enrolment lives at /2fa/passkey/setup. Wraps python-webauthn==2.5.2 in a thin service layer (src/auth/webauthn.py) that persists credentials in the existing User.webauthn_credentials JSON column (added in B-2.1 — no schema change). Each credential dict carries id, public_key, sign_count, transports, name, and created_at. sign_count is updated after every successful authentication for WebAuthn anti-cloning (§6.1.1). Backend: 6 new auth routes (passkey_setup, register/begin, register/finish, delete, auth/begin, auth/finish). The 4 JSON endpoints are CSRF-exempt at Flask-WTF level because CSRFProtect cannot read tokens from a JSON body without app-wide config; the X-CSRFToken header is still sent as defence-in-depth. The form-POST delete route DOES enforce CSRF. The @csrf_exempt decorator was previously a no-op label; init_auth_extensions now walks module-level functions and applies real csrf.exempt() to any flagged with _csrf_exempt=True. Login gate now fires when the user has TOTP enabled OR at least one passkey, and totp_verify_login passes has_passkeys + has_totp flags so the template can show only the relevant sections. Frontend: templates/auth/totp_verify.html updated IN PLACE with a passkey button section (above TOTP) and an "ou" divider. New templates/auth/passkey_setup.html for managing/enrolling passkeys. New static/js/webauthn-client.js (no external deps, ES2020) wraps navigator.credentials and exchanges base64url payloads with the backend. Tailwind CSS rebuilt. Tests: 22 new tests in tests/test_webauthn_passkey.py covering the service layer (b64url helpers, RP config, list/has, begin/finish for both registration and authentication, delete) and the route flow (CSRF-exempt JSON endpoints, login gate redirection, sign_count anti-cloning persistence). Mocks python-webauthn's verify_* functions so tests run without a real authenticator. Windows manual driver follows the existing no-conftest pattern. Self-review: 22/22 new tests pass; 21/21 prior TOTP, 16/16 email, 21/21 OAuth tests still pass (no regression). Env: config/env.oauth.example documents WEBAUTHN_RP_ID, WEBAUTHN_RP_NAME, WEBAUTHN_ORIGIN with full deployment notes. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
28 KiB
28 KiB