LdapUserBackend: Set a query's base DN when a table gets required

This ensures that the query receives the correct base DN even if the table
gets adjusted by calling from() subsequently.

refs #10567

library/Icinga/Authentication/User/LdapUserBackend.php

@@ -190,24 +190,6 @@ class LdapUserBackend extends LdapRepository implements UserBackendInterface, In
             ->setFilter($config->filter);
     }
 
-    /**
-     * Return a new query for the given columns
-     *
-     * @param   array   $columns    The desired columns, if null all columns will be queried
-     *
-     * @return  RepositoryQuery
-     */
-    public function select(array $columns = null)
-    {
-        $query = parent::select($columns);
-        $query->getQuery()->setBase($this->baseDn);
-        if ($this->filter) {
-            $query->getQuery()->setNativeFilter($this->filter);
-        }
-
-        return $query;
-    }
-
     /**
      * Initialize this repository's virtual tables
      *
@@ -335,6 +317,28 @@ class LdapUserBackend extends LdapRepository implements UserBackendInterface, In
         return ((int) $value) >= $bigBang->diff($now)->days;
     }
 
+    /**
+     * Validate that the requested table exists
+     *
+     * @param   string              $table      The table to validate
+     * @param   RepositoryQuery     $query      An optional query to pass as context
+     *
+     * @return  string
+     *
+     * @throws  ProgrammingError                In case the given table does not exist
+     */
+    public function requireTable($table, RepositoryQuery $query = null)
+    {
+        if ($query !== null) {
+            $query->getQuery()->setBase($this->baseDn);
+            if ($this->filter) {
+                $query->getQuery()->setNativeFilter($this->filter);
+            }
+        }
+
+        return parent::requireTable($table, $query);
+    }
+
     /**
      * Validate that the given column is a valid query target and return it or the actual name if it's an alias
      *