WPS: Remove PushButton from M1 ConfigMethods on AP

These config methods are for the Enrollee role, i.e., for adding
external Registrars, and as such, PushButton should not be claimed
to be supported.

src/wps/wps_enrollee.c

@@ -119,6 +119,7 @@ static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg)
 static struct wpabuf * wps_build_m1(struct wps_data *wps)
 {
 	struct wpabuf *msg;
+	u16 config_methods;
 
 	if (os_get_random(wps->nonce_e, WPS_NONCE_LEN) < 0)
 		return NULL;
@@ -130,6 +131,19 @@ static struct wpabuf * wps_build_m1(struct wps_data *wps)
 	if (msg == NULL)
 		return NULL;
 
+	config_methods = wps->wps->config_methods;
+	if (wps->wps->ap) {
+		/*
+		 * These are the methods that the AP supports as an Enrollee
+		 * for adding external Registrars, so remove PushButton.
+		 */
+		config_methods &= ~WPS_CONFIG_PUSHBUTTON;
+#ifdef CONFIG_WPS2
+		config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON |
+				    WPS_CONFIG_PHY_PUSHBUTTON);
+#endif /* CONFIG_WPS2 */
+	}
+
 	if (wps_build_version(msg) ||
 	    wps_build_msg_type(msg, WPS_M1) ||
 	    wps_build_uuid_e(msg, wps->uuid_e) ||
@@ -139,7 +153,7 @@ static struct wpabuf * wps_build_m1(struct wps_data *wps)
 	    wps_build_auth_type_flags(wps, msg) ||
 	    wps_build_encr_type_flags(wps, msg) ||
 	    wps_build_conn_type_flags(wps, msg) ||
-	    wps_build_config_methods(msg, wps->wps->config_methods) ||
+	    wps_build_config_methods(msg, config_methods) ||
 	    wps_build_wps_state(wps, msg) ||
 	    wps_build_device_attrs(&wps->wps->dev, msg) ||
 	    wps_build_rf_bands(&wps->wps->dev, msg) ||