Fix Lack of Resources & Rate Limiting in Gorilla
Gorilla/mux is a robust router, but it offers zero default protection against resource exhaustion. In a production environment, an attacker can exploit this by flooding endpoints to trigger OOM (Out of Memory) errors or exhausting the connection pool. Without explicit rate limiting and server timeouts, your Go service is a sitting duck for DoS attacks.
The Vulnerable Pattern
package mainimport ( “net/http” “github.com/gorilla/mux” )
func main() { r := mux.NewRouter() r.HandleFunc(“/api/resource”, func(w http.ResponseWriter, r *http.Request) { // Vulnerable: No rate limiting, no timeouts, no payload size limits w.Write([]byte(“Sensitive Data”)) })
// Vulnerable: Default server has no timeouts http.ListenAndServe(":8080", r)
}
The Secure Implementation
The secure implementation mitigates 'Lack of Resources' at two levels. First, it introduces a custom middleware using 'golang.org/x/time/rate' which implements a Token Bucket algorithm; this prevents a single IP or botnet from overwhelming the CPU and application logic. Second, it replaces the default 'http.ListenAndServe' with a configured 'http.Server'. By setting 'ReadTimeout' and 'WriteTimeout', we prevent Slowloris attacks that hold connections open indefinitely. 'MaxHeaderBytes' is set to 1MB to prevent attackers from sending massive headers to exhaust memory.
package mainimport ( “net/http” “time” “github.com/gorilla/mux” “golang.org/x/time/rate” )
var limiter = rate.NewLimiter(10, 30) // 10 req/s, burst of 30
func limitMiddleware(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { if !limiter.Allow() { http.Error(w, “429 Too Many Requests”, http.StatusTooManyRequests) return } next.ServeHTTP(w, r) }) }
func main() { r := mux.NewRouter() r.Use(limitMiddleware) r.HandleFunc(“/api/resource”, func(w http.ResponseWriter, r *http.Request) { w.Write([]byte(“Protected Data”)) })
srv := &http.Server{ Addr: "127.0.0.1:8080", Handler: r, ReadTimeout: 5 * time.Second, WriteTimeout: 10 * time.Second, IdleTimeout: 120 * time.Second, MaxHeaderBytes: 1 << 20, // 1MB } srv.ListenAndServe()
}
Your Gorilla API
might be exposed to Lack of Resources & Rate Limiting
74% of Gorilla apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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