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<?php
/**
* Authentication source which let the user chooses among a list of
* other authentication sources
*
* @author Lorenzo Gil, Yaco Sistemas S.L.
* @package simpleSAMLphp
* @version $Id$
*/
class sspmod_multiauth_Auth_Source_MultiAuth extends SimpleSAML_Auth_Source {
/**
* The key of the AuthId field in the state.
*/
const AUTHID = 'sspmod_multiauth_Auth_Source_MultiAuth.AuthId';
/**
* The string used to identify our states.
*/
const STAGEID = 'sspmod_multiauth_Auth_Source_MultiAuth.StageId';
/**
* The key where the sources is saved in the state.
*/
const SOURCESID = 'sspmod_multiauth_Auth_Source_MultiAuth.SourceId';
/**
* The key where the selected source is saved in the session.
*/
const SESSION_SOURCE = 'multiauth:selectedSource';
/**
* Array of sources we let the user chooses among.
*/
private $sources;
/**
* Constructor for this authentication source.
*
* @param array $info Information about this authentication source.
* @param array $config Configuration.
*/
public function __construct($info, $config) {
assert('is_array($info)');
assert('is_array($config)');
/* Call the parent constructor first, as required by the interface. */
parent::__construct($info, $config);
if (!array_key_exists('sources', $config)) {
throw new Exception('The required "sources" config option was not found');
}
$globalConfiguration = SimpleSAML_Configuration::getInstance();
$defaultLanguage = $globalConfiguration->getString('language.default', 'en');
$authsources = SimpleSAML_Configuration::getConfig('authsources.php');
$this->sources = array();
foreach($config['sources'] as $source => $info) {
if (is_int($source)) { // Backwards compatibility
$source = $info;
$info = array();
}
if (array_key_exists('text', $info)) {
$text = $info['text'];
} else {
$text = array($defaultLanguage => $source);
}
if (array_key_exists('css-class', $info)) {
$css_class = $info['css-class'];
} else {
/* Use the authtype as the css class */
$authconfig = $authsources->getArray($source, NULL);
if (!array_key_exists(0, $authconfig) || !is_string($authconfig[0])) {
$css_class = "";
} else {
$css_class = str_replace(":", "-", $authconfig[0]);
}
}
$this->sources[] = array(
'source' => $source,
'text' => $text,
'css_class' => $css_class,
);
}
}
/**
* Prompt the user with a list of authentication sources.
*
* This method saves the information about the configured sources,
* and redirects to a page where the user must select one of these
* authentication sources.
*
* This method never return. The authentication process is finished
* in the delegateAuthentication method.
*
* @param array &$state Information about the current authentication.
*/
public function authenticate(&$state) {
assert('is_array($state)');
$state[self::AUTHID] = $this->authId;
$state[self::SOURCESID] = $this->sources;
/* Save the $state array, so that we can restore if after a redirect */
$id = SimpleSAML_Auth_State::saveState($state, self::STAGEID);
/* Redirect to the select source page. We include the identifier of the
saved state array as a parameter to the login form */
$url = SimpleSAML_Module::getModuleURL('multiauth/selectsource.php');
$params = array('AuthState' => $id);
// Allowes the user to specify the auth souce to be used
if(isset($_GET['source'])) {
$params['source'] = $_GET['source'];
}
SimpleSAML_Utilities::redirectTrustedURL($url, $params);
/* The previous function never returns, so this code is never
executed */
assert('FALSE');
}
/**
* Delegate authentication.
*
* This method is called once the user has choosen one authentication
* source. It saves the selected authentication source in the session
* to be able to logout properly. Then it calls the authenticate method
* on such selected authentication source.
*
* @param string $authId Selected authentication source
* @param array $state Information about the current authentication.
*/
public static function delegateAuthentication($authId, $state) {
assert('is_string($authId)');
assert('is_array($state)');
$as = SimpleSAML_Auth_Source::getById($authId);
if ($as === NULL) {
throw new Exception('Invalid authentication source: ' . $authId);
}
/* Save the selected authentication source for the logout process. */
$session = SimpleSAML_Session::getInstance();
$session->setData(self::SESSION_SOURCE, $state[self::AUTHID], $authId);
try {
$as->authenticate($state);
} catch (SimpleSAML_Error_Exception $e) {
SimpleSAML_Auth_State::throwException($state, $e);
} catch (Exception $e) {
$e = new SimpleSAML_Error_UnserializableException($e);
SimpleSAML_Auth_State::throwException($state, $e);
}
SimpleSAML_Auth_Source::completeAuth($state);
}
/**
* Log out from this authentication source.
*
* This method retrieves the authentication source used for this
* session and then call the logout method on it.
*
* @param array &$state Information about the current logout operation.
*/
public function logout(&$state) {
assert('is_array($state)');
/* Get the source that was used to authenticate */
$session = SimpleSAML_Session::getInstance();
$authId = $session->getData(self::SESSION_SOURCE, $this->authId);
$source = SimpleSAML_Auth_Source::getById($authId);
if ($source === NULL) {
throw new Exception('Invalid authentication source during logout: ' . $source);
}
/* Then, do the logout on it */
$source->logout($state);
}
/**
* Set the previous authentication source.
*
* This method remembers the authentication source that the user selected
* by storing its name in a cookie.
*
* @param string $source Name of the authentication source the user selected.
*/
public function setPreviousSource($source) {
assert('is_string($source)');
$cookieName = 'multiauth_source_' . $this->authId;
$config = SimpleSAML_Configuration::getInstance();
$params = array(
/* We save the cookies for 90 days. */
'lifetime' => (60*60*24*90),
/* The base path for cookies.
This should be the installation directory for simpleSAMLphp. */
'path' => ('/' . $config->getBaseUrl()),
'httponly' => FALSE,
);
SimpleSAML_Utilities::setCookie($cookieName, $source, $params, FALSE);
}
/**
* Get the previous authentication source.
*
* This method retrieves the authentication source that the user selected
* last time or NULL if this is the first time or remembering is disabled.
*/
public function getPreviousSource() {
$cookieName = 'multiauth_source_' . $this->authId;
if(array_key_exists($cookieName, $_COOKIE)) {
return $_COOKIE[$cookieName];
} else {
return NULL;
}
}
}
?>
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