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034ad95fed
The gate's _unauth_response set next=<path> on the /login redirect URL,
but nothing downstream read it: render_login_html ignored next=,
auth_login dropped it, and auth_callback read next= from its own query
string — which an IDP never sets on the callback URL (real IDPs only
echo back code+state). The _validate_post_login_target plumbing in the
callback was unreachable on the happy path, so users always landed on
"/" regardless of what they originally requested.
Worse: reading next= from the callback URL was a latent open-redirect
sink, since an attacker could craft /auth/callback?...&next=/admin and
have the server honour it post-auth.
Fix carries next= through the round trip on a server-controlled channel:
1. login_page reads request.query_params['next'] and passes it (post-
validation) to render_login_html.
2. render_login_html threads next= URL-encoded into each provider
button's href, with HTML-attribute escaping as defence in depth.
3. auth_login accepts ?next= as a query param, re-validates, and
appends it as a fourth segment (next=<urlquoted>) in the PKCE
cookie payload alongside provider/state/verifier.
4. auth_callback no longer accepts a next: str = "" query param. It
parses next= out of the PKCE cookie and validates that with the
same same-origin rules. Any attacker-supplied ?next= on the
callback URL is silently ignored — server-only carrier.
Test coverage adds three classes:
- TestAuthCallbackNext drives /login → /auth/login → IDP-bounce →
/auth/callback end-to-end without smuggling next= onto the callback
URL (which is what the previous tests did and why they didn't
catch the bug). Includes test_attacker_callback_next_param_is_ignored
to pin the security property that the URL value is never read.
- TestRenderLoginHtmlNext covers the rendering function at the
unit boundary so a regression that drops next_path is caught
without spinning up the full app.
- TestAuthLoginPkceCookieNext inspects the Set-Cookie header on
/auth/login responses so a regression in cookie encoding is caught
without driving the full round trip.
Mutation-tested: reverting auth_callback to read next= from the URL
trips 3 of 6 TestAuthCallbackNext tests (the safe-path and attacker-
hardening ones), confirming the suite discriminates between the cookie
read and the URL read.
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|---|---|---|
| .. | ||
| __init__.py | ||
| audit.py | ||
| base.py | ||
| cookies.py | ||
| login_page.py | ||
| middleware.py | ||
| registry.py | ||
| routes.py | ||
| ws_tickets.py | ||