Added HTTP security headers to web.go (#3583)

Signed-off-by: Eric Valenzuela <evalenzuela@thousandeyes.com>

web/web.go

@@ -71,6 +71,17 @@ import (
 
 var localhostRepresentations = []string{"127.0.0.1", "localhost"}
 
+// secureHeadersMiddleware adds common HTTP security headers to responses.
+func secureHeadersMiddleware(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Add("X-XSS-Protection", "1; mode=block")
+		w.Header().Add("X-Content-Type-Options", "nosniff")
+		w.Header().Add("X-Frame-Options", "SAMEORIGIN")
+		w.Header().Add("Content-Security-Policy", "frame-ancestors 'self'")
+		h.ServeHTTP(w, r)
+	})
+}
+
 var (
 	requestDuration = prometheus.NewHistogramVec(
 		prometheus.HistogramOpts{
@@ -478,8 +489,10 @@ func (h *Handler) Run(ctx context.Context) error {
 
 	errlog := stdlog.New(log.NewStdlibAdapter(level.Error(h.logger)), "", 0)
 
+	withSecureHeaders := nethttp.Middleware(opentracing.GlobalTracer(), secureHeadersMiddleware(mux), operationName)
+
 	httpSrv := &http.Server{
-		Handler:     nethttp.Middleware(opentracing.GlobalTracer(), mux, operationName),
+		Handler:     withSecureHeaders,
 		ErrorLog:    errlog,
 		ReadTimeout: h.options.ReadTimeout,
 	}

web/web_test.go

@@ -83,6 +83,54 @@ func TestGlobalURL(t *testing.T) {
 	}
 }
 
+func TestEndpointHeaders(t *testing.T) {
+	t.Parallel()
+	dbDir, err := ioutil.TempDir("", "tsdb-ready")
+
+	testutil.Ok(t, err)
+
+	defer os.RemoveAll(dbDir)
+
+	db, err := libtsdb.Open(dbDir, nil, nil, nil)
+
+	testutil.Ok(t, err)
+
+	opts := &Options{
+		ListenAddress:  ":9095",
+		ReadTimeout:    30 * time.Second,
+		MaxConnections: 512,
+		Context:        nil,
+		Storage:        &tsdb.ReadyStorage{},
+		QueryEngine:    nil,
+		RuleManager:    nil,
+		Notifier:       nil,
+		RoutePrefix:    "/",
+		EnableAdminAPI: true,
+		TSDB:           func() *libtsdb.DB { return db },
+	}
+
+	opts.Flags = map[string]string{}
+
+	webHandler := New(nil, opts)
+	go func() {
+		err := webHandler.Run(context.Background())
+		if err != nil {
+			panic(fmt.Sprintf("Can't start webhandler error %s", err))
+		}
+	}()
+
+	time.Sleep(5 * time.Second)
+
+	resp, err := http.Get("http://localhost:9095/version")
+
+	testutil.Ok(t, err)
+	testutil.Equals(t, "1; mode=block", resp.Header.Get("X-XSS-Protection"))
+	testutil.Equals(t, "nosniff", resp.Header.Get("X-Content-Type-Options"))
+	testutil.Equals(t, "SAMEORIGIN", resp.Header.Get("X-Frame-Options"))
+	testutil.Equals(t, "frame-ancestors 'self'", resp.Header.Get("Content-Security-Policy"))
+
+}
+
 func TestReadyAndHealthy(t *testing.T) {
 	t.Parallel()
 	dbDir, err := ioutil.TempDir("", "tsdb-ready")