42Crunch for Gorilla Mux

Gorilla Mux relies on explicit route definitions, custom matchers, and per-handler context keys. middleBrick treats context as an opaque black box and does not require source code or instrumentation. The scanner sends read-only requests against registered endpoints and evaluates how routing decisions, path parameters, and middleware layers affect security outcomes.

Because handlers are invoked only when a route matches, scan coverage depends on providing a base path that includes your Mux routes. The scanner does not infer custom matchers or context-derived authorization logic; findings such as missing authentication on a route are reported only if the request reaches the handler and reveals an issue. You should map high-value routes and ensure they are exercised during a scan.

middleBrick evaluates Authentication and Property Authorization for Gorilla Mux services using Bearer, API key, Basic auth, and Cookie credentials. The scanner checks JWT misconfigurations such as alg=none, weak algorithms, expired tokens, missing claims, and sensitive data in claims, and validates the presence and enforcement of security headers and WWW-Authenticate compliance.

For routes that depend on context-derived permissions, detection is limited to what is observable over the wire. If your authorization decisions are encoded in context keys set by middleware, ensure that authenticated scans include credentials that surface the intended access controls. The scanner validates whether endpoints expose over-privileged responses or leak internal fields when context is provided.

Input Validation findings cover CORS wildcard configurations (with and without credentials), dangerous HTTP methods, and exposure of debug endpoints. For Gorilla Mux, this includes testing path parameters for IDOR-like patterns and observing how the service handles malformed or unexpected input without triggering intrusive payloads.

Error and stack-trace leakage is assessed through status codes and response body patterns. The scanner never sends destructive payloads, so deep runtime errors such as panics are not triggered. If your error format reveals stack traces or framework details, those findings are reported with remediation guidance aligned to OWASP API Top 10 (2023).

middleBrick parses OpenAPI 3.0, 3.1, and Swagger 2.0 documents with recursive $ref resolution for Gorilla Mux services. It cross-references the spec against runtime behavior to highlight undefined security schemes, sensitive fields, deprecated operations, and missing pagination indicators.

This comparison helps you identify mismatches between declared routes and actual handler exposure, such as operations that exist in code but are omitted from the spec. Use these insights to tighten spec-to-runtime alignment and support audit evidence for SOC 2 Type II and PCI-DSS 4.0 controls.

Provide the base URL of your Gorilla Mux service to initiate a scan. Authenticated scans require domain verification via DNS TXT record or a well-known HTTP file, and only specific headers are forwarded to preserve safety. Header allowlist includes Authorization, X-API-Key, Cookie, and X-Custom-* headers.

Integrate the middleBrick CLI into development workflows with middlebrick scan <url>, use the GitHub Action to gate CI/CD when scores drop below your threshold, or connect via the MCP server from AI-assisted tools. Continuous monitoring is available in Pro tier to track score drift and surface new findings over time.