phpBB LDAP validate session patch

diff --git a/phpBB/includes/auth/auth_ldap.php b/phpBB/includes/auth/auth_ldap.php
index eebf147..1a4fd12 100644
+++ b/phpBB/includes/auth/auth_ldap.php
@@ -271,6 +271,52 @@ function login_ldap(&$username, &$password)
        );
 }

+function validate_session_ldap($user_row)
+{
+       global $config;
+       if (!@extension_loaded('ldap'))
+       {
+               return true;
+       }
+
+       $config['ldap_port'] = (int) $config['ldap_port'];
+       if ($config['ldap_port'])
+       {
+               $ldap = @ldap_connect($config['ldap_server'], $config['ldap_port']);
+       }
+       else
+       {
+               $ldap = @ldap_connect($config['ldap_server']);
+       }
+
+       if (!$ldap)
+       {
+               return true;
+       }
+
+       ldap_set_option($ldap, LDAP_OPT_PROTOCOL_VERSION, 3);
+       ldap_set_option($ldap, LDAP_OPT_REFERRALS, 0);
+
+       if ($config['ldap_user'] || $config['ldap_password'])
+       {
+               if (!@ldap_bind($ldap, htmlspecialchars_decode($config['ldap_user']), htmlspecialchars_decode($config['ldap_password'])))
+               {
+                       return true;
+               }
+       }
+
+       $search = @ldap_list(
+               $ldap,
+               htmlspecialchars_decode($config['ldap_base_dn']),
+               ldap_user_filter($user_row['username'])
+       );
+
+       $ldap_result = @ldap_get_entries($ldap, $search);
+
+       @ldap_close($ldap);
+       return is_array($ldap_result) && isset($ldap_result["count"]) && $ldap_result["count"] > 0;
+}
+
 /**
 * Generates a filter string for ldap_search to find a user
 *
@@ -350,4 +396,4 @@ function acp_ldap(&$new)
        );
 }

-?>
\ No newline at end of file
+?>