Enable authentication if the LDAP server has multiple base DNs. Store the user's credentials in a cookie/session, and swap them out to the configured credentials when logged in.

app/Ldap/Connection.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Ldap;
+
+use LdapRecord\Connection as ConnectionBase;
+use LdapRecord\LdapInterface;
+
+class Connection extends ConnectionBase
+{
+
+	public function __construct($config = [], LdapInterface $ldap = null)
+	{
+		parent::__construct($config,$ldap);
+
+		// We need to override this so that we use our own Guard, that stores the users credentials in the session
+		$this->authGuardResolver = function () {
+			return new Guard($this->ldap, $this->configuration);
+		};
+	}
+}