From 00f5f744d0306097b7d2ff2f88fe2bf4a9fda612 Mon Sep 17 00:00:00 2001
From: Ashus <Ashus@users.noreply.github.com>
Date: Thu, 9 Jul 2020 15:40:44 +0200
Subject: [PATCH] [Web] Allow underscore and hyphen in DKIM selector (#3643)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This change allows to have cleaner DNS zones as mail security related entries usually begin with _.

Co-authored-by: Václav Silber <vaclav.silber@poski.com>
---
 data/web/inc/functions.dkim.inc.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/data/web/inc/functions.dkim.inc.php b/data/web/inc/functions.dkim.inc.php
index 72220ee1..46d66d31 100644
--- a/data/web/inc/functions.dkim.inc.php
+++ b/data/web/inc/functions.dkim.inc.php
@@ -34,7 +34,7 @@ function dkim($_action, $_data = null, $privkey = false) {
           );
           continue;
         }
-        if (!ctype_alnum($dkim_selector)) {
+        if (!ctype_alnum(str_replace(['-', '_'], '', $dkim_selector))) {
           $_SESSION['return'][] = array(
             'type' => 'danger',
             'log' => array(__FUNCTION__, $_action, $_data, $privkey),