add IMAP authenticator module (closes #485)

classes/auth/imap.php

+<?php
+/* Requires php-imap
+	Put the following options in config.php:
+
+	define('IMAP_AUTH_SERVER', 'your.imap.server:port');
+	define('IMAP_AUTH_OPTIONS', '/tls/novalidate-cert/norsh');
+	// More about options: http://php.net/manual/ru/function.imap-open.php
+
+ */
+
+class Auth_Imap extends Auth_Base {
+
+	function authenticate($login, $password) {
+
+		if ($login && $password) {
+			$imap = imap_open(
+				"{".IMAP_AUTH_SERVER.IMAP_AUTH_OPTIONS."}INBOX",
+				$login,
+				$password);
+
+			if ($imap) {
+				imap_close($imap);
+
+				return $this->auto_create_user($login);
+			}
+		}
+
+		return false;
+	}
+
+}
+?>