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Patrick Buckley
52aba17740
_build_oidc_redirect_uri previously fell back to the request Host
header when redirect_base was unset. With a permissive reverse proxy
or direct backend access, a spoofed Host minted an authorize URL
pointing to attacker-controlled host — combined with a permissive
IdP redirect_uri allowlist this enables auth-code interception.
There is no production scenario where a Host-derived redirect_uri is
correct, so this fails closed:
- initialize_oidc_state checks redirect_base after discovery succeeds
and disables OIDC (with an explicit error log naming the env var)
if it's empty. Runs before fetch_jwks so a misconfigured deploy
doesn't make a wasted JWKS call.
- _build_oidc_redirect_uri simplifies to f"{redirect_base}/v1/api/auth/oidc/callback".
request parameter dropped; both call sites (handle_oidc_authorize,
handle_oidc_callback) updated.
- docs/oidc.md promotes TURNSTONE_OIDC_REDIRECT_BASE from "Recommended"
to "Required" with the security rationale.