Fix API Rate Limit Exhaustion in Beego
API Rate Limit Exhaustion in Beego occurs when an endpoint lacks a mechanism to throttle incoming requests, allowing attackers to perform automated brute-force attacks or trigger Resource Exhaustion (DoS). In Beego, this is often due to the absence of 'InsertFilter' logic to intercept requests before they hit the controller logic.
The Vulnerable Pattern
package controllersimport “github.com/beego/beego/v2/server/web”
type LoginController struct { web.Controller }
// VULNERABLE: No rate limiting allows unlimited login attempts func (c *LoginController) Post() { username := c.GetString(“user”) password := c.GetString(“pass”) // Auth logic here… c.Data[“json”] = map[string]string{“status”: “ok”} c.ServeJSON() }
The Secure Implementation
The fix implements a Token Bucket algorithm using 'golang.org/x/time/rate'. By using Beego's 'web.InsertFilter' with the 'web.BeforeRouter' hook, we intercept the request before the controller is instantiated. The 'getLimiter' function tracks IP-specific limiters in a thread-safe map. If the 'Allow()' check fails, we return a 429 status code and call 'ExecutionStop()' to prevent further processing, effectively shielding the backend from resource exhaustion.
package mainimport ( “github.com/beego/beego/v2/server/web” “github.com/beego/beego/v2/server/web/context” “golang.org/x/time/rate” “net/http” “sync” )
var visitors = make(map[string]*rate.Limiter) var mu sync.Mutex
func getLimiter(ip string) *rate.Limiter { mu.Lock() defer mu.Unlock() if l, exists := visitors[ip]; exists { return l } limiter := rate.NewLimiter(2, 5) // 2 requests per second, burst of 5 visitors[ip] = limiter return limiter }
func main() { // SECURE: Middleware filter to enforce rate limits globally or per-route web.InsertFilter(“/api/*”, web.BeforeRouter, func(ctx *context.Context) { ip := ctx.Input.IP() limiter := getLimiter(ip) if !limiter.Allow() { ctx.Output.SetStatus(http.StatusTooManyRequests) ctx.WriteString(“429 Too Many Requests”) ctx.ExecutionStop() } }) web.Run() }
Your Beego API
might be exposed to API Rate Limit Exhaustion
74% of Beego apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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