cmd/relaypoolsrv: Allow validation of relay join requests by certificate (fixes #7196) (#7217)

cmd/strelaysrv/main.go

@@ -247,7 +247,7 @@ func main() {
 	for _, pool := range pools {
 		pool = strings.TrimSpace(pool)
 		if len(pool) > 0 {
-			go poolHandler(pool, uri, mapping)
+			go poolHandler(pool, uri, mapping, cert)
 		}
 	}
 

cmd/strelaysrv/pool.go

@@ -4,6 +4,7 @@ package main
 
 import (
 	"bytes"
+	"crypto/tls"
 	"encoding/json"
 	"io/ioutil"
 	"log"
@@ -16,7 +17,7 @@ const (
 	httpStatusEnhanceYourCalm = 429
 )
 
-func poolHandler(pool string, uri *url.URL, mapping mapping) {
+func poolHandler(pool string, uri *url.URL, mapping mapping, ownCert tls.Certificate) {
 	if debug {
 		log.Println("Joining", pool)
 	}
@@ -31,7 +32,24 @@ func poolHandler(pool string, uri *url.URL, mapping mapping) {
 			uriCopy.String(),
 		})
 
-		resp, err := httpClient.Post(pool, "application/json", &b)
+		poolUrl, err := url.Parse(pool)
+		if err != nil {
+			log.Printf("Could not parse pool url '%s': %v", pool, err)
+		}
+
+		client := http.DefaultClient
+		if poolUrl.Scheme == "https" {
+			// Sent our certificate in join request
+			client = &http.Client{
+				Transport: &http.Transport{
+					TLSClientConfig: &tls.Config{
+						Certificates: []tls.Certificate{ownCert},
+					},
+				},
+			}
+		}
+
+		resp, err := client.Post(pool, "application/json", &b)
 		if err != nil {
 			log.Printf("Error joining pool %v: HTTP request: %v", pool, err)
 			time.Sleep(time.Minute)