Saml2_Service.php
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<?php
namespace Wpo\Services;
use \Wpo\Core\Wpmu_Helpers;
use \Wpo\Services\Authentication_Service;
use \Wpo\Services\Error_Service;
use \Wpo\Services\Log_Service;
// Prevent public access to this script
defined('ABSPATH') or die();
if (!class_exists('\Wpo\Services\Saml2_Service')) {
class Saml2_Service
{
/**
* Iniates a SAML 2.0 request and redirects the user to the IdP.
*
* @since 11.0
*
* @return void
*/
public static function initiate_request($redirect_to, $params = array())
{
Log_Service::write_log('DEBUG', '##### -> ' . __METHOD__);
/**
* @since 16.0 Filters the redirect_to url
*/
$redirect_to = apply_filters('wpo365/cookie/remove/url', $redirect_to);
$redirect_to = urlencode($redirect_to);
require_once($GLOBALS['WPO_CONFIG']['plugin_dir'] . '/OneLogin/_toolkit_loader.php');
$forceAuthn = Options_Service::get_global_boolean_var('saml_force_authn');
$saml_settings = self::saml_settings();
$auth = new \OneLogin_Saml2_Auth($saml_settings);
$auth->login($redirect_to, $params, $forceAuthn);
}
/**
* Gets an attribute / claim from the SAML 2.0 response.
*
* @since 11.0
*
* @param $name string WPO365 User field name (looked up in the claim mappings setting)
* @param $saml_attributes array Attributes received as part of the SAML response
* @param $to_lower boolean True if the attribute value returned should be converted to lower case
*
* @return string Attribute's value as string
*/
public static function get_attribute($claim, $saml_attributes, $to_lower = false)
{
// TODO Get mappings from configuration
$claim_mappings = array(
'preferred_username' => 'http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name',
'email' => 'http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress',
'first_name' => 'http://schemas.xmlsoap.org/ws/2005/05/identity/claims/givenname',
'last_name' => 'http://schemas.xmlsoap.org/ws/2005/05/identity/claims/surname',
'full_name' => 'http://schemas.microsoft.com/identity/claims/displayname',
'tid' => 'http://schemas.microsoft.com/identity/claims/tenantid',
'objectidentifier' => 'http://schemas.microsoft.com/identity/claims/objectidentifier',
);
if (isset($claim_mappings[$claim]) && isset($saml_attributes[$claim_mappings[$claim]]) && is_array($saml_attributes[$claim_mappings[$claim]]) && sizeof($saml_attributes[$claim_mappings[$claim]]) > 0) {
return $to_lower
? \strtolower(htmlentities($saml_attributes[$claim_mappings[$claim]][0]))
: htmlentities($saml_attributes[$claim_mappings[$claim]][0]);
} elseif (isset($saml_attributes[$claim]) && is_array($saml_attributes[$claim]) && sizeof($saml_attributes[$claim]) > 0) {
return htmlentities($saml_attributes[$claim][0]);
}
return '';
}
/**
* Creates a OneLogin settings object with the settings configured through the WPO365 wizard.
*
* @since 11.0
*
* @return mixed(array|boolean) Array with OneLogin (non-advanced) settings or true / false when validating.
*/
public static function saml_settings($validate = false)
{
$base_url = Options_Service::get_global_string_var('saml_base_url');
$sp_entity_id = Options_Service::get_global_string_var('saml_sp_entity_id');
$sp_acs_url = Options_Service::get_global_string_var('saml_sp_acs_url');
$sp_sls_url = Options_Service::get_global_string_var('saml_sp_sls_url');
$idp_entity_id = Options_Service::get_global_string_var('saml_idp_entity_id');
$idp_ssos_url = Options_Service::get_global_string_var('saml_idp_ssos_url');
$idp_sls_url = Options_Service::get_global_string_var('saml_idp_sls_url');
$x509cert = Options_Service::get_aad_option('saml_x509_cert');
$log_level = $validate ? 'WARN' : 'ERROR';
$has_errors = false;
$exit_on_error = function () use ($validate) {
if (!$validate) {
Authentication_Service::goodbye(Error_Service::SAML2_ERROR);
exit();
}
};
if (empty($base_url)) {
Log_Service::write_log($log_level, __METHOD__ . ' -> SAML 2.0 error (Base URL cannot be empty)');
$exit_on_error();
$has_errors = true;
}
if (empty($sp_entity_id)) {
Log_Service::write_log($log_level, __METHOD__ . ' -> SAML 2.0 error (Service Provider Entity ID cannot be empty)');
$exit_on_error();
$has_errors = true;
}
if (empty($sp_acs_url)) {
Log_Service::write_log($log_level, __METHOD__ . ' -> SAML 2.0 error (Service Provider Assertion Consumer Service URL cannot be empty)');
$exit_on_error();
$has_errors = true;
}
if (empty($sp_sls_url)) {
Log_Service::write_log($log_level, __METHOD__ . ' -> SAML 2.0 error (Service Provider Single Logout Service URL cannot be empty)');
$exit_on_error();
$has_errors = true;
}
if (empty($idp_entity_id)) {
Log_Service::write_log($log_level, __METHOD__ . ' -> SAML 2.0 error (Identity Provider Entity ID cannot be empty)');
$exit_on_error();
$has_errors = true;
}
if (empty($idp_ssos_url)) {
Log_Service::write_log($log_level, __METHOD__ . ' -> SAML 2.0 error (Identity Provider Single Sign-on Service URL cannot be empty)');
$exit_on_error();
$has_errors = true;
}
if (empty($idp_sls_url)) {
Log_Service::write_log($log_level, __METHOD__ . ' -> SAML 2.0 error (Identity Provider Single Logout Service URL cannot be empty)');
$exit_on_error();
$has_errors = true;
}
if (empty($x509cert)) {
Log_Service::write_log($log_level, __METHOD__ . ' -> SAML 2.0 error (X509 Certificate cannot be empty)');
$exit_on_error();
$has_errors = true;
}
if (true === $validate) {
return !$has_errors;
}
$settings = array(
'strict' => true,
'debug' => false,
'baseurl' => $base_url,
'sp' => array(
'entityId' => $sp_entity_id,
'assertionConsumerService' => array(
'url' => $sp_acs_url,
'binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST',
),
'singleLogoutService' => array(
'url' => $sp_sls_url,
'binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
),
'NameIDFormat' => 'urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified',
'x509cert' => '',
'privateKey' => '',
),
'idp' => array(
'entityId' => $idp_entity_id,
'singleSignOnService' => array(
'url' => $idp_ssos_url,
'binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
),
'singleLogoutService' => array(
'url' => $idp_sls_url,
'responseUrl' => '',
'binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
),
'x509cert' => $x509cert,
),
);
/**
* @since 11.14
*
* Example:
*
* define( 'WPO_SAML2_ADVANCED_SETTINGS',
* array(
* 'security' => array(
* 'requestedAuthnContext' => array (
* 'urn:federation:authentication:windows'
* )
* )
* )
* );
*/
if (defined('WPO_SAML2_ADVANCED_SETTINGS') && is_array(constant('WPO_SAML2_ADVANCED_SETTINGS'))) {
return array_merge($settings, constant('WPO_SAML2_ADVANCED_SETTINGS'));
}
return $settings;
}
public static function check_message_id($message_id)
{
$cache = Wpmu_Helpers::mu_get_transient('wpo365_saml_message_ids');
if (empty($cache) || !\is_array($cache)) {
$cache = array(
'last_write_index' => 0,
'slots' => array(
0 => array($message_id),
1 => array(),
2 => array(),
3 => array(),
4 => array(),
5 => array(),
),
);
return;
}
$minutes = intval(date('i'));
$mod = $minutes % 10;
$write_slot = $minutes - $mod / 10;
foreach ($cache['slots'] as $slot) {
$index = array_search($message_id, $slot);
if (false !== $index) {
Log_Service::write_log('ERROR', __METHOD__ . ' -> SAML 2.0 error (replay attack detected: SAML message ID already used)');
Authentication_Service::goodbye(Error_Service::TAMPERED_WITH);
exit();
}
}
$cache['slots'][$write_slot][] = $message_id;
$cache['slots'][(($write_slot + 1) % 6)] = array();
Wpmu_Helpers::mu_set_transient('wpo365_saml_message_ids', $cache);
}
}
}