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Secure Webhook Intake Guard (Header Auth, CORS, HMAC & Replay Protection)
An enterprise-grade, defense-in-depth intake architecture in n8n modeled after Stripe and GitHub webhook standards, enforcing Header Auth, CORS…
An enterprise-grade, defense-in-depth intake architecture in n8n modeled after Stripe and GitHub webhook standards, enforcing Header Auth, CORS origins, HMAC-SHA256 signature verification, and timestamp freshness check (±300s window) while failing closed on any deviation.
- Guarded intake gate enforcing Header Auth and Allowed Origins CORS before running downstream steps
- Canonical signedPayload synthesis (${timestamp}.${body}) preventing parameter tampering or injection
- Cryptographic HMAC-SHA256 verification using n8n Crypto node and shared secret with constant-time equality check
- Strict timestamp freshness window (±300s / 5 min) neutralizing replay attacks and clock skew spoofing
- Structured, auditable HTTP responses: 401 Unauthorized, 403 Forbidden, and 202 Accepted with fail-closed safety
Built with: n8n, Webhook Security, HMAC-SHA256, Header Auth, CORS, Replay Attack Defense, API Gateway, JavaScript