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<?php
/**
* Filter to add attributes to the identity by executing a query against an LDAP directory
*
* Original Author: Steve Moitozo II <steve_moitozo@jaars.org>
* Created: 20100513
* Updated: 20100920 Steve Moitozo II
* - incorporated feedback from Olav Morken to prep code for inclusion in SimpleSAMLphp distro
* - moved call to ldap_set_options() inside test for $ds
* - added the output of ldap_error() to the exceptions
* - reduced some of the nested ifs
* - added support for multiple values
* - added support for anonymous binds
* - added escaping of search filter and attribute
* Updated: 20111118 Ryan Panning
* - Updated the class to use BaseFilter which reuses LDAP connection features
* - Added conversion of original filter option names for backwards-compatibility
* - Updated the constructor to use the new config method
* - Updated the process method to use the new config variable names
* Updated: 20131119 Yørn de Jong / Jaime Perez
* - Added support for retrieving multiple values at once from LDAP
* - Don't crash but fail silently on LDAP errors; the plugin is to complement attributes
*
* @author Yørn de Jong
* @author Jaime Perez
* @author Steve Moitozo
* @author JAARS, Inc.
* @author Ryan Panning
* @package simpleSAMLphp
* @version $Id$
*/
class sspmod_ldap_Auth_Process_AttributeAddFromLDAP extends sspmod_ldap_Auth_Process_BaseFilter {
/**
* LDAP attribute to add to the request attributes
*
* @var string
*/
protected $search_attributes;
/**
* LDAP search filter to use in the LDAP query
*
* @var string
*/
protected $search_filter;
/**
* What to do with attributes when the target already exists. Either replace, merge or add.
*
* @var string
*/
protected $attr_policy;
/**
* Initialize this filter.
*
* @param array $config Configuration information about this filter.
* @param mixed $reserved For future use.
*/
public function __construct($config, $reserved) {
/*
* For backwards compatibility, check for old config names
* @TODO Remove after 2.0
*/
if (isset($config['ldap_host'])) {
$config['ldap.hostname'] = $config['ldap_host'];
}
if (isset($config['ldap_port'])) {
$config['ldap.port'] = $config['ldap_port'];
}
if (isset($config['ldap_bind_user'])) {
$config['ldap.username'] = $config['ldap_bind_user'];
}
if (isset($config['ldap_bind_pwd'])) {
$config['ldap.password'] = $config['ldap_bind_pwd'];
}
if (isset($config['userid_attribute'])) {
$config['attribute.username'] = $config['userid_attribute'];
}
if (isset($config['ldap_search_base_dn'])) {
$config['ldap.basedn'] = $config['ldap_search_base_dn'];
}
if (isset($config['ldap_search_filter'])) {
$config['search.filter'] = $config['ldap_search_filter'];
}
if (isset($config['ldap_search_attribute'])) {
$config['search.attribute'] = $config['ldap_search_attribute'];
}
if (isset($config['new_attribute_name'])) {
$config['attribute.new'] = $config['new_attribute_name'];
}
/*
* Remove the old config names
* @TODO Remove after 2.0
*/
unset(
$config['ldap_host'],
$config['ldap_port'],
$config['ldap_bind_user'],
$config['ldap_bind_pwd'],
$config['userid_attribute'],
$config['ldap_search_base_dn'],
$config['ldap_search_filter'],
$config['ldap_search_attribute'],
$config['new_attribute_name']
);
// Now that we checked for BC, run the parent constructor
parent::__construct($config, $reserved);
// Get filter specific config options
$this->search_attributes = $this->config->getArrayize('attributes', array());
if (empty($this->search_attributes)) {
$new_attribute = $this->config->getString('attribute.new', '');
$this->search_attributes[$new_attribute] = $this->config->getString('search.attribute');
}
$this->search_filter = $this->config->getString('search.filter');
// get the attribute policy
$this->attr_policy = $this->config->getString('attribute.policy', 'merge');
}
/**
* Add attributes from an LDAP server.
*
* @param array &$request The current request
*/
public function process(&$request) {
assert('is_array($request)');
assert('array_key_exists("Attributes", $request)');
$attributes =& $request['Attributes'];
// perform a merge on the ldap_search_filter
// loop over the attributes and build the search and replace arrays
foreach ($attributes as $attr => $val) {
$arrSearch[] = '%'.$attr.'%';
if (strlen($val[0]) > 0) {
$arrReplace[] = SimpleSAML_Auth_LDAP::escape_filter_value($val[0]);
} else {
$arrReplace[] = '';
}
}
// merge the attributes into the ldap_search_filter
$filter = str_replace($arrSearch, $arrReplace, $this->search_filter);
if (strpos($filter, '%') !== FALSE) {
SimpleSAML_Logger::info('AttributeAddFromLDAP: There are non-existing attributes in the search filter. ('.
$this->search_filter.')');
return;
}
if (!in_array($this->attr_policy, array('merge', 'replace', 'add'))) {
SimpleSAML_Logger::warning("AttributeAddFromLDAP: 'attribute.policy' must be one of 'merge',".
"'replace' or 'add'.");
return;
}
// search for matching entries
try {
$entries = $this->getLdap()->searchformultiple($this->base_dn, $filter,
array_values($this->search_attributes), TRUE, FALSE);
} catch (Exception $e) {
return; // silent fail, error is still logged by LDAP search
}
// handle [multiple] values
foreach ($entries as $entry) {
foreach ($this->search_attributes as $target => $name) {
if (is_numeric($target)) {
$target = $name;
}
if (isset($attributes[$target]) && $this->attr_policy === 'replace') {
unset($attributes[$target]);
}
$name = strtolower($name);
if (isset($entry[$name])) {
unset($entry[$name]['count']);
if (isset($attributes[$target])) {
foreach(array_values($entry[$name]) as $value) {
if ($this->attr_policy === 'merge') {
if (!in_array($value, $attributes[$target])) {
$attributes[$target][] = $value;
}
} else {
$attributes[$target][] = $value;
}
}
} else {
$attributes[$target] = array_values($entry[$name]);
}
}
}
}
}
}
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