Add fixes to Tunnel module virtualmin/virtualmin-gpl#358 (comment)

authentic.pl

@@ -1323,7 +1323,8 @@ sub theme_redirect
 
     if (!theme_redirect_download($url)) {
         $main::ignore_errors = 1;
-        set_theme_temp_data('redirected', $url);
+        set_theme_temp_data('redirected', $url)
+          if (!theme_set_redirect_forbidden($url));
         $main::ignore_errors = 0;
         print "Location: $url\n\n";
     }
@@ -1347,6 +1348,18 @@ sub theme_redirect_url_alterer
     }
 }
 
+sub theme_set_redirect_forbidden
+{
+    my ($url) = @_;
+
+    if ($url &&
+        ($url =~ /\/tunnel\/link\.cgi\//))
+    {
+        return 1;
+    }
+    return 0;
+}
+
 sub theme_header_redirect_download
 {
     my ($url, $delay, $message) = @_;

theme.info

@@ -1,7 +1,7 @@
 desc=Authentic Theme
 longdesc=Webmin/Usermin/Virtualmin/Cloudmin theme based on Bootstrap and Font Awesome (https://github.com/authentic-theme/authentic-theme)
 version=19.85-beta2
-mversion=17
+mversion=18
 depends=1.985 1.832
 depends_reason=https://github.com/webmin/webmin/commit/ae6921a
 webmin=1