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<?php
/**
* Filter to generate a groups attribute based on many of the attributes of the user.
*
* @author Olav Morken, UNINETT AS.
* @package simpleSAMLphp
*/
class sspmod_core_Auth_Process_GenerateGroups extends SimpleSAML_Auth_ProcessingFilter {
/**
* The attributes we should generate groups from.
*/
private $generateGroupsFrom;
/**
* Initialize this filter.
*
* @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)');
if (count($config) === 0) {
/* Use default groups. */
$this->generateGroupsFrom = array(
'eduPersonAffiliation',
'eduPersonOrgUnitDN',
'eduPersonEntitlement',
);
} else {
/* Validate configuration. */
foreach ($config as $attributeName) {
if (!is_string($attributeName)) {
throw new Exception('Invalid attribute name for core:GenerateGroups filter: ' .
var_export($attributeName, TRUE));
}
}
$this->generateGroupsFrom = $config;
}
}
/**
* Apply filter to add groups attribute.
*
* @param array &$request The current request
*/
public function process(&$request) {
assert('is_array($request)');
assert('array_key_exists("Attributes", $request)');
$groups = array();
$attributes =& $request['Attributes'];
$realm = self::getRealm($attributes);
if ($realm !== NULL) {
$groups[] = 'realm-' . $realm;
}
foreach ($this->generateGroupsFrom as $name) {
if (!array_key_exists($name, $attributes)) {
SimpleSAML_Logger::debug('GenerateGroups - attribute \'' . $name . '\' not found.');
/* Attribute not present. */
continue;
}
foreach ($attributes[$name] as $value) {
$value = self::escapeIllegalChars($value);
$groups[] = $name . '-' . $value;
if ($realm !== NULL) {
$groups[] = $name . '-' . $realm . '-' . $value;
}
}
}
if (count($groups) > 0) {
$attributes['groups'] = $groups;
}
}
/**
* Determine which realm the user belongs to.
*
* This function will attempt to determine the realm a user belongs to based on the
* eduPersonPrincipalName attribute if it is present. If it isn't, or if it doesn't contain
* a realm, NULL will be returned.
*
* @param array $attributes The attributes of the user.
* @return string|NULL The realm of the user, or NULL if we are unable to determine the realm.
*/
private static function getRealm($attributes) {
assert('is_array($attributes)');
if (!array_key_exists('eduPersonPrincipalName', $attributes)) {
return NULL;
}
$eppn = $attributes['eduPersonPrincipalName'];
if (count($eppn) < 1) {
return NULL;
}
$eppn = $eppn[0];
$realm = explode('@', $eppn, 2);
if (count($realm) < 2) {
return NULL;
}
$realm = $realm[1];
return self::escapeIllegalChars($realm);
}
/**
* Escape special characters in a string.
*
* This function is similar to urlencode, but encodes many more characters.
* This function takes any characters not in [a-zA-Z0-9_@=.] and encodes them with as
* %<hex version>. For example, it will encode '+' as '%2b' and '%' as '%25'.
*
* @param string $string The string which should be escaped.
* @return string The escaped string.
*/
private static function escapeIllegalChars($string) {
assert('is_string($string)');
return preg_replace_callback('/([^a-zA-Z0-9_@=.])/',
function ($m) { return sprintf("%%%02x", ord($m[1])); },
$string);
}
}
?>
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