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<?php
/**
* Authproc filter to generate a persistent NameID.
*
* @package simpleSAMLphp
*/
class sspmod_saml_Auth_Process_PersistentNameID extends sspmod_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 $reserved For future use.
*/
public function __construct($config, $reserved) {
parent::__construct($config, $reserved);
assert('is_array($config)');
$this->format = SAML2_Const::NAMEID_PERSISTENT;
if (!isset($config['attribute'])) {
throw new SimpleSAML_Error_Exception('PersistentNameID: Missing required option \'attribute\'.');
}
$this->attribute = $config['attribute'];
}
/**
* Get the NameID value.
*
* @return string|NULL The NameID value.
*/
protected function getValue(array &$state) {
if (!isset($state['Destination']['entityid'])) {
SimpleSAML_Logger::warning('No SP entity ID - not generating persistent NameID.');
return NULL;
}
$spEntityId = $state['Destination']['entityid'];
if (!isset($state['Source']['entityid'])) {
SimpleSAML_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'][$this->attribute]) === 0) {
SimpleSAML_Logger::warning('Missing attribute ' . var_export($this->attribute, TRUE) . ' on user - not generating persistent NameID.');
return NULL;
}
if (count($state['Attributes'][$this->attribute]) > 1) {
SimpleSAML_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];
$secretSalt = SimpleSAML_Utilities::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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