TUN-6728: Verify http status code ingress rule

CHANGES.md

@@ -1,3 +1,7 @@
+## 2022.9.0
+### New Features
+- cloudflared now rejects ingress rules with invalid http status codes for http_status.
+
 ## 2022.8.1
 ### New Features
 - cloudflared now remembers if it connected to a certain protocol successfully. If it did, it does not fall back to a lower

ingress/ingress.go

@@ -182,11 +182,14 @@ func validateIngress(ingress []config.UnvalidatedIngressRule, defaults OriginReq
 			path := strings.TrimPrefix(r.Service, prefix)
 			service = &unixSocketPath{path: path, scheme: "https"}
 		} else if prefix := "http_status:"; strings.HasPrefix(r.Service, prefix) {
-			status, err := strconv.Atoi(strings.TrimPrefix(r.Service, prefix))
+			statusCode, err := strconv.Atoi(strings.TrimPrefix(r.Service, prefix))
 			if err != nil {
-				return Ingress{}, errors.Wrap(err, "invalid HTTP status")
+				return Ingress{}, errors.Wrap(err, "invalid HTTP status code")
 			}
-			srv := newStatusCode(status)
+			if statusCode < 100 || statusCode > 999 {
+				return Ingress{}, fmt.Errorf("invalid HTTP status code: %d", statusCode)
+			}
+			srv := newStatusCode(statusCode)
 			service = &srv
 		} else if r.Service == HelloWorldService || r.Service == "hello-world" || r.Service == "helloworld" {
 			service = new(helloWorld)

ingress/ingress_test.go

@@ -208,6 +208,14 @@ ingress:
 			args: args{rawYAML: `
 ingress:
  - service: http_status:asdf
+`},
+			wantErr: true,
+		},
+		{
+			name: "Invalid HTTP status code",
+			args: args{rawYAML: `
+ingress:
+ - service: http_status:8080
 `},
 			wantErr: true,
 		},