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<?php
declare(strict_types=1);
namespace SimpleSAML\Module\saml\Auth\Process;
use SAML2\Constants;
use SimpleSAML\Error;
use SimpleSAML\Logger;
use SimpleSAML\Utils;
/**
* Authentication processing filter to generate a persistent NameID.
*
* @package SimpleSAMLphp
*/
class PersistentNameID extends \SimpleSAML\Module\saml\BaseNameIDGenerator
{
/**
* Which attribute contains the unique identifier of the user.
*
* @var string
*/
private $attribute;
/**
* Initialize this filter, parse configuration.
*
* @param array $config Configuration information about this filter.
* @param mixed $reserved For future use.
*
* @throws \SimpleSAML\Error\Exception If the required option 'attribute' is missing.
*/
public function __construct($config, $reserved)
{
parent::__construct($config, $reserved);
assert(is_array($config));
$this->format = Constants::NAMEID_PERSISTENT;
if (!isset($config['attribute'])) {
throw new Error\Exception("PersistentNameID: Missing required option 'attribute'.");
}
$this->attribute = $config['attribute'];
}
/**
* Get the NameID value.
*
* @param array $state The state array.
* @return string|null The NameID value.
*/
protected function getValue(array &$state)
{
if (!isset($state['Destination']['entityid'])) {
Logger::warning('No SP entity ID - not generating persistent NameID.');
return null;
}
$spEntityId = $state['Destination']['entityid'];
if (!isset($state['Source']['entityid'])) {
Logger::warning('No IdP entity ID - not generating persistent NameID.');
return null;
}
$idpEntityId = $state['Source']['entityid'];
if (!isset($state['Attributes'][$this->attribute]) || count($state['Attributes'][$this->attribute]) === 0) {
Logger::warning(
'Missing attribute ' . var_export($this->attribute, true) .
' on user - not generating persistent NameID.'
);
return null;
}
if (count($state['Attributes'][$this->attribute]) > 1) {
Logger::warning(
'More than one value in attribute ' . var_export($this->attribute, true) .
' on user - not generating persistent NameID.'
);
return null;
}
$uid = array_values($state['Attributes'][$this->attribute]); // just in case the first index is no longer 0
$uid = $uid[0];
if (empty($uid)) {
Logger::warning(
'Empty value in attribute ' . var_export($this->attribute, true) .
' on user - not generating persistent NameID.'
);
return null;
}
$secretSalt = Utils\Config::getSecretSalt();
$uidData = 'uidhashbase' . $secretSalt;
$uidData .= strlen($idpEntityId) . ':' . $idpEntityId;
$uidData .= strlen($spEntityId) . ':' . $spEntityId;
$uidData .= strlen($uid) . ':' . $uid;
$uidData .= $secretSalt;
return sha1($uidData);
}
}
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