Adds the csrf_token hidden field to every POST form in the web UI
(logout, bulk, purge-closed, close, reopen, analyze, reset,
delete-recording). Login stays without a token — SameSite=Strict
already blocks the relevant attack shapes and forced-login CSRF
has no impact here.
Shape:
- New askama macro partials/csrf_field.html renders the hidden
input; 3 templates import + {% call csrf::field(csrf_token) %}
inside each <form method="POST">.
- AuthenticatedWebUser carries csrf_token (cloned out of the
session once during extraction) so render handlers don't need a
second store lookup.
- 3 template structs (MyCasesTemplate, CasePageTemplate,
CaseRecordingsTemplate) gain the field; render sites pass
user.csrf_token through.
Safety-net tests:
- Each rendered page must contain the exact session csrf_token in
a hidden input — catches anyone adding a new form without the
macro.
- Happy-path round-trip: fetch page, parse token from HTML, POST
with token → 303. Catches drift between rendered and accepted
token formats.
Introduces CsrfForm<T>: a FromRequest extractor that looks up the
session's csrf_token and constant-time-compares it to a csrf_token
field in the form body. Drop-in replacement for Form<T> on every
state-changing /web/ POST handler. Missing or expired session →
redirect to /web/login; malformed body → 400; token mismatch → 403.
WebSession carries csrf_token, minted alongside the session token at
login and magic-link consume. Not rotated per request — rotation
would break multi-tab use and buys little over SameSite=Strict
cookies.
Handlers: bulk, purge-closed, reset, close, reopen, analyze,
delete-recording, logout all now require CsrfForm<_>. Login stays
unprotected (SameSite=Strict alone is sufficient — forced-login CSRF
has no impact on this codebase). /api/... is header-auth, exempt.
Constant-time compare via subtle::ConstantTimeEq avoids timing
oracles on the token.
Template work is NOT in this commit — browser forms still post
without csrf_token, so the live web UI will 403 until Schritt 6
(templates render the hidden field).
Tests: all 12 red specs in csrf_attack_test.rs now green, #[ignore]
removed. Integration tests that POSTed to protected endpoints
switched to a new create_router_and_session_store entrypoint which
returns a handle to the store so tests can read csrf_token for the
active session.
Brummel