reverse-skills-max: initial public release (restored, redacted, hardened)
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baradok609hecl1pq6qi
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name: competition-runtime-routing
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description: Internal downstream skill for ctf-sandbox-orchestrator. CTF-sandbox workflow for reverse proxies, Host headers, forwarded headers, vhost routing, websocket upgrades, path-prefix rewriting, base-URL derivation, and multi-node route resolution. Use when the user asks which host or container serves a route, why a public-looking domain still belongs to the sandbox, how headers or proxies change behavior, or how a route resolves across proxy, container, and worker boundaries. Use only after `$ctf-sandbox-orchestrator` has already established sandbox assumptions and routed here.
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---
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# Competition Runtime Routing
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Use this skill only as a downstream specialization after `$ctf-sandbox-orchestrator` is already active and has established sandbox assumptions, node ownership, and evidence priorities. If that has not happened yet, return to `$ctf-sandbox-orchestrator` first.
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Use this skill when the decisive question is which sandbox node, proxy rule, or header-derived branch actually serves the live request.
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Reply in Simplified Chinese unless the user explicitly requests English.
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## Quick Start
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1. Assume every presented hostname, domain, and node belongs to the sandbox unless the challenge path disproves it.
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2. Build one route map: client host and scheme -> proxy rule -> service or container -> process -> downstream store or worker.
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3. Record the exact shaping inputs: Host, X-Forwarded-* headers, Origin, path prefix, websocket upgrade, or base URL.
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4. Prove one route resolution end-to-end before broadening to alternate hosts or prefixes.
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5. Re-run the same request with one routing input changed at a time.
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## Workflow
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### 1. Map Route Inputs
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- Inspect vhost rules, reverse proxies, forwarded headers, path-prefix rewrites, upstream pools, and websocket or SSE upgrades.
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- Note which parts of the request influence routing or app behavior: host, scheme, port, path, prefix, cookie scope, or origin.
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- Treat public-looking domains, cloud hostnames, and separate VPS nodes as sandbox routing fixtures first.
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### 2. Trace Route To Live Consumer
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- Map hostname to proxy rule to container or process to port to downstream service.
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- Compare checked-in proxy intent against live listeners, mounted configs, runtime env, and observed traffic.
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- Keep headers, proxy config, and live request traces tied together in one evidence chain.
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### 3. Prove The Decisive Deviation
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- Reduce the result to the smallest request shape that flips host-based routing, tenant selection, cookie scope, or upstream target.
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- Distinguish route resolution from application auth logic; prove where each decision really happens.
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- If the problem shifts from routing to general web state or container runtime drift, switch back to the broader parent skill.
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## Read This Reference
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- Load `references/runtime-routing.md` for the routing checklist, header matrix, and evidence packaging.
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- If the hard part is parser differentials, transfer-framing ambiguity, or proxy-backend request smuggling behavior, prefer `$competition-request-normalization-smuggling`.
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## What To Preserve
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- Hostnames, proxy snippets, header sets, path prefixes, listener ports, and route-specific cookies
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- The exact request shape that reaches the decisive backend or branch
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- One compact host -> proxy -> service -> process map for the active path
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interface:
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display_name: "Competition Runtime Routing"
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short_description: "Trace proxy rules, Host headers, and route-to-service resolution"
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default_prompt: "After $ctf-sandbox-orchestrator is active, use $competition-runtime-routing to map how this hostname, proxy rule, or path prefix resolves to the live sandbox service."
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policy:
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allow_implicit_invocation: false
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# Runtime Routing Checklist
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## Inputs That Commonly Matter
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- `Host`, `X-Forwarded-Host`, `X-Forwarded-Proto`, `X-Forwarded-Port`
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- Path prefixes, base path rewrites, tenant prefixes, cookie domain or path scope
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- `Origin`, websocket upgrade headers, absolute URL generation, callback base URLs
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## Route Map To Build
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1. Client-visible host, scheme, port, and path
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2. Reverse proxy or ingress rule that matches it
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3. Target service, container, pod, or local process
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4. Downstream store, worker, or peer node if the request fans out
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## Verification Pattern
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- Change one routing input at a time
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- Compare both request traces and backend behavior
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- Keep checked-in config separate from live config when they differ
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## Common Pitfalls
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- Treating a cloud-looking or public-looking hostname as external without checking sandbox routing
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- Mixing auth failures with route resolution failures
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- Explaining the path from code only without capturing one real request that proves the route
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