72 lines
3.5 KiB
Markdown
72 lines
3.5 KiB
Markdown
---
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id: review-002-srv11-srv12-router-ordering
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name: Router-layering fixes — double token resolution on WS and mcp, decoy 405 on extra routes (SRV-11, SRV-12)
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status: completed
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depends_on: []
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scope: narrow
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risk: medium
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impact: component
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level: implementation
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tags: [server, review-002, stealth]
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---
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## Description
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Two review-002 findings in `server/adapter.rs`'s `build_router` — both
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are axum `route_layer`/merge-ordering semantics (empirically verified
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in review 002 with an axum 0.8.9 harness; `route_layer` wraps routes
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registered *before* the call):
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- **SRV-11**: the router-wide `bearer_auth_middleware` layer (:328)
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wraps the WS route (registered earlier at :307-317 with its own
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`ws_bearer_auth`) and the `/mcp` nest (own layer at :288-292) — the
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token resolves **twice** on both, and the code comment claims the
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opposite ("resolves the token exactly once"). Benign today
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(ag stashes agree), but a provider with token-use side effects
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double-counts.
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- **SRV-12**: `method_not_allowed_fallback(decoy_method_not_allowed)`
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(:322) covers only routers registered before the extras merge —
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wrong-method probes on **extra routes** return axum's bare 405 (no
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body, no `Server: nginx`), the exact stealth probe SRV-07's fix
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neutralized for the default surface.
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## Acceptance Criteria
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- [ ] SRV-11: the WS route resolves the token exactly once (drop the
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router-wide layer's application to it — e.g. verify with an
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axum-semantics-confirmed mechanism: register the WS route after
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the route_layer call, or exclude via per-route wrapping) and
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`/mcp` likewise (keep exactly one auth layer for it); the
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corrected comment states axum's actual `route_layer` semantics
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- [ ] SRV-11 test: a counting IdentityProvider — one WS upgrade
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request resolves the token exactly once (and one `/mcp` request
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likewise, feature-gated)
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- [ ] SRV-12: `method_not_allowed_fallback(decoy_method_not_allowed)`
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re-applied after the extras merge; test: wrong-method probe on
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an extra route carries the decoy body + `Server: nginx` header
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- [ ] Re-verify the existing router tests (extra-routes auth, decoy
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405 default-surface, reserved-path panics) still pass — the
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merge-order changes must not regress SRV-01's guarantee
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- [ ] `cargo test`, `cargo clippy --all-targets -- -D warnings`,
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`cargo fmt --check` pass
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## References
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- docs/reviews/002-post-remediation-review.md (Part A', SRV-11, SRV-12; hot-spot 2 in the server pass)
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- src/server/adapter.rs:274-345 (build_router), :296-320 (comment + WS route), :322 (405 fallback), :328 (router-wide layer)
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- tasks/server/review-001-extra-routes-auth.md (the SRV-01 ordering this must preserve), tasks/server/review-001-hyper-server-knobs.md (SRV-07's decoy-405 work)
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## Notes
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Order-sensitivity warning (from the server pass): "any future route
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addition must re-derive these semantics empirically" — after fixing,
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add the counting test + the extra-route 405 test so the invariants are
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pinned, not just commented. The SRV-01 opt-out shape (inner layers
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win) must remain exactly as tested. Keep the SRV-10 fold-in fix
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(historical) intact — this task is about the *comment* being false and
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the double-resolve being real.
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## Summary
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WS upgrade route + /mcp nest moved after the router-wide bearer route_layer (single token resolution each; WS MethodRouter fallback carries the decoy 405); method_not_allowed_fallback re-applied after the extras merge (SRV-12). 6 counting/shape tests pin the ordering invariants.
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