Always implement proper authentication checks and protect sensitive credentials throughout your codebase. This includes: 1. **Validate all authentication inputs properly** to prevent panics and security vulnerabilities: ```rust // Bad: Will panic on short inputs if &authorization[0..7] != "Bearer " { // ... } // Good: Safe parsing without panic risk if let Some(token) = authorization.strip_prefix("Bearer ") { // Process token safely } else { return Err(tonic::Status::invalid_argument("invalid authorization format")); } ``` 2. **Implement permission checks for all API endpoints**, even internal or testing ones: ```rust // Always add permission checks to new endpoints async fn your_api_endpoint( request: Request, _cancel: CancellationToken, ) -> Result, ApiError> { // Add this check to prevent unauthorized access check_permissions(&request, None)?; // Rest of your endpoint logic // ... } ``` 3. **Redact sensitive information in logs** to prevent credential exposure: ```rust // When logging URLs or other structures that might contain credentials match url::Url::parse(url) { Ok(mut url) => { if url.password().is_some() { let _ = url.set_password(Some("_redacted_")); } // Now safe to log info!("Using URL: {}", url); } // ... } ``` These practices prevent unauthorized access to sensitive endpoints, reduce risks of credential leakage, and improve the overall security posture of the system.