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<?php
namespace Auth;
use Event\AuthEvent;
/**
* LDAP model
*
* @package auth
* @author Frederic Guillot
*/
class Ldap extends Base
{
/**
* Backend name
*
* @var string
*/
const AUTH_NAME = 'LDAP';
/**
* Authenticate the user
*
* @access public
* @param string $username Username
* @param string $password Password
* @return boolean
*/
public function authenticate($username, $password)
{
$username = LDAP_USERNAME_CASE_SENSITIVE ? $username : strtolower($username);
$result = $this->findUser($username, $password);
if (is_array($result)) {
$user = $this->user->getByUsername($username);
if ($user) {
// There is already a local user with that name
if ($user['is_ldap_user'] == 0) {
return false;
}
}
else {
// We create automatically a new user
if ($this->createUser($username, $result['name'], $result['email'])) {
$user = $this->user->getByUsername($username);
}
else {
return false;
}
}
// We open the session
$this->userSession->refresh($user);
$this->container['dispatcher']->dispatch('auth.success', new AuthEvent(self::AUTH_NAME, $user['id']));
return true;
}
return false;
}
/**
* Create a new local user after the LDAP authentication
*
* @access public
* @param string $username Username
* @param string $name Name of the user
* @param string $email Email address
* @return bool
*/
public function createUser($username, $name, $email)
{
$values = array(
'username' => $username,
'name' => $name,
'email' => $email,
'is_admin' => 0,
'is_ldap_user' => 1,
);
return $this->user->create($values);
}
/**
* Find the user from the LDAP server
*
* @access public
* @param string $username Username
* @param string $password Password
* @return boolean|array
*/
public function findUser($username, $password)
{
$ldap = $this->connect();
if (is_resource($ldap) && $this->bind($ldap, $username, $password)) {
return $this->search($ldap, $username, $password);
}
return false;
}
/**
* LDAP connection
*
* @access private
* @return resource $ldap LDAP connection
*/
private function connect()
{
if (! function_exists('ldap_connect')) {
die('The PHP LDAP extension is required');
}
// Skip SSL certificate verification
if (! LDAP_SSL_VERIFY) {
putenv('LDAPTLS_REQCERT=never');
}
$ldap = ldap_connect(LDAP_SERVER, LDAP_PORT);
if (! is_resource($ldap)) {
die('Unable to connect to the LDAP server: "'.LDAP_SERVER.'"');
}
ldap_set_option($ldap, LDAP_OPT_PROTOCOL_VERSION, 3);
ldap_set_option($ldap, LDAP_OPT_REFERRALS, 0);
ldap_set_option($ldap, LDAP_OPT_NETWORK_TIMEOUT, 1);
ldap_set_option($ldap, LDAP_OPT_TIMELIMIT, 1);
if (LDAP_START_TLS && ! @ldap_start_tls($ldap)) {
die('Unable to use ldap_start_tls()');
}
return $ldap;
}
/**
* LDAP bind
*
* @access private
* @param resource $ldap LDAP connection
* @param string $username Username
* @param string $password Password
* @return boolean
*/
private function bind($ldap, $username, $password)
{
if (LDAP_BIND_TYPE === 'user') {
$ldap_username = sprintf(LDAP_USERNAME, $username);
$ldap_password = $password;
}
else if (LDAP_BIND_TYPE === 'proxy') {
$ldap_username = LDAP_USERNAME;
$ldap_password = LDAP_PASSWORD;
}
else {
$ldap_username = null;
$ldap_password = null;
}
if (! @ldap_bind($ldap, $ldap_username, $ldap_password)) {
return false;
}
return true;
}
/**
* LDAP user lookup
*
* @access private
* @param resource $ldap LDAP connection
* @param string $username Username
* @param string $password Password
* @return boolean|array
*/
private function search($ldap, $username, $password)
{
$sr = @ldap_search($ldap, LDAP_ACCOUNT_BASE, sprintf(LDAP_USER_PATTERN, $username), array(LDAP_ACCOUNT_FULLNAME, LDAP_ACCOUNT_EMAIL));
if ($sr === false) {
return false;
}
$info = ldap_get_entries($ldap, $sr);
// User not found
if (count($info) == 0 || $info['count'] == 0) {
return false;
}
// We got our user
if (@ldap_bind($ldap, $info[0]['dn'], $password)) {
return array(
'username' => $username,
'name' => $this->getFromInfo($info, LDAP_ACCOUNT_FULLNAME),
'email' => $this->getFromInfo($info, LDAP_ACCOUNT_EMAIL),
);
}
return false;
}
/**
* Retrieve info on LDAP user
*
* @param string $username Username
* @param string $email Email address
*/
public function lookup($username = null, $email = null)
{
$query = $this->getQuery($username, $email);
if ($query === false) {
return false;
}
// Connect and attempt anonymous bind
$ldap = $this->connect();
if (! is_resource($ldap) || ! $this->bind($ldap, null, null)) {
return false;
}
// Try to find user
$sr = @ldap_search($ldap, LDAP_ACCOUNT_BASE, $query, array(LDAP_ACCOUNT_FULLNAME, LDAP_ACCOUNT_EMAIL, LDAP_ACCOUNT_ID));
if ($sr === false) {
return false;
}
$info = ldap_get_entries($ldap, $sr);
// User not found
if (count($info) == 0 || $info['count'] == 0) {
return false;
}
// User id not retrieved: LDAP_ACCOUNT_ID not properly configured
if (! $username && ! isset($info[0][LDAP_ACCOUNT_ID][0])) {
return false;
}
return array(
'username' => $this->getFromInfo($info, LDAP_ACCOUNT_ID, $username),
'name' => $this->getFromInfo($info, LDAP_ACCOUNT_FULLNAME),
'email' => $this->getFromInfo($info, LDAP_ACCOUNT_EMAIL, $email),
);
}
/**
* Get the LDAP query to find a user
*
* @param string $username Username
* @param string $email Email address
*/
private function getQuery($username, $email)
{
if ($username && $email) {
return '(&('.sprintf(LDAP_USER_PATTERN, $username).')('.sprintf(LDAP_ACCOUNT_EMAIL, $email).')';
}
else if ($username) {
return sprintf(LDAP_USER_PATTERN, $username);
}
else if ($email) {
return '('.LDAP_ACCOUNT_EMAIL.'='.$email.')';
}
else {
return false;
}
}
/**
* Return a value from the LDAP info
*
* @param array $info LDAP info
* @param string $key Key
* @param string $default Default value if key not set in entry
* @return string
*/
private function getFromInfo($info, $key, $default = '')
{
return isset($info[0][$key][0]) ? $info[0][$key][0] : $default;
}
}
|
