BookStack/app/Services/LdapService.php

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<?php namespace BookStack\Services;
use BookStack\Exceptions\LdapException;
use Illuminate\Contracts\Auth\Authenticatable;
/**
* Class LdapService
* Handles any app-specific LDAP tasks.
* @package BookStack\Services
*/
class LdapService
{
protected $ldap;
protected $ldapConnection;
protected $config;
/**
* LdapService constructor.
* @param Ldap $ldap
*/
public function __construct(Ldap $ldap)
{
$this->ldap = $ldap;
$this->config = config('services.ldap');
}
/**
* Get the details of a user from LDAP using the given username.
* User found via configurable user filter.
* @param $userName
* @return array|null
* @throws LdapException
*/
public function getUserDetails($userName)
{
$ldapConnection = $this->getConnection();
$this->bindSystemUser($ldapConnection);
// Find user
$userFilter = $this->buildFilter($this->config['user_filter'], ['user' => $userName]);
$baseDn = $this->config['base_dn'];
$emailAttr = $this->config['email_attribute'];
$followReferrals = $this->config['follow_referrals'] ? 1 : 0;
$this->ldap->setOption($ldapConnection, LDAP_OPT_REFERRALS, $followReferrals);
$users = $this->ldap->searchAndGetEntries($ldapConnection, $baseDn, $userFilter, ['cn', 'uid', 'dn', $emailAttr]);
if ($users['count'] === 0) {
return null;
}
$user = $users[0];
return [
'uid' => (isset($user['uid'])) ? $user['uid'][0] : $user['dn'],
'name' => $user['cn'][0],
'dn' => $user['dn'],
'email' => (isset($user[$emailAttr])) ? (is_array($user[$emailAttr]) ? $user[$emailAttr][0] : $user[$emailAttr]) : null
];
}
/**
* @param Authenticatable $user
* @param string $username
* @param string $password
* @return bool
* @throws LdapException
*/
public function validateUserCredentials(Authenticatable $user, $username, $password)
{
$ldapUser = $this->getUserDetails($username);
if ($ldapUser === null) {
return false;
}
if ($ldapUser['uid'] !== $user->external_auth_id) {
return false;
}
$ldapConnection = $this->getConnection();
try {
$ldapBind = $this->ldap->bind($ldapConnection, $ldapUser['dn'], $password);
} catch (\ErrorException $e) {
$ldapBind = false;
}
return $ldapBind;
}
/**
* Bind the system user to the LDAP connection using the given credentials
* otherwise anonymous access is attempted.
* @param $connection
* @throws LdapException
*/
protected function bindSystemUser($connection)
{
$ldapDn = $this->config['dn'];
$ldapPass = $this->config['pass'];
$isAnonymous = ($ldapDn === false || $ldapPass === false);
if ($isAnonymous) {
$ldapBind = $this->ldap->bind($connection);
} else {
$ldapBind = $this->ldap->bind($connection, $ldapDn, $ldapPass);
}
if (!$ldapBind) {
throw new LdapException(($isAnonymous ? trans('errors.ldap_fail_anonymous') : trans('errors.ldap_fail_authed')));
}
}
/**
* Get the connection to the LDAP server.
* Creates a new connection if one does not exist.
* @return resource
* @throws LdapException
*/
protected function getConnection()
{
if ($this->ldapConnection !== null) {
return $this->ldapConnection;
}
// Check LDAP extension in installed
if (!function_exists('ldap_connect') && config('app.env') !== 'testing') {
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throw new LdapException(trans('errors.ldap_extension_not_installed'));
}
// Get port from server string and protocol if specified.
$ldapServer = explode(':', $this->config['server']);
$hasProtocol = preg_match('/^ldaps{0,1}\:\/\//', $this->config['server']) === 1;
if (!$hasProtocol) {
array_unshift($ldapServer, '');
}
$hostName = $ldapServer[0] . ($hasProtocol?':':'') . $ldapServer[1];
$defaultPort = $ldapServer[0] === 'ldaps' ? 636 : 389;
$ldapConnection = $this->ldap->connect($hostName, count($ldapServer) > 2 ? intval($ldapServer[2]) : $defaultPort);
if ($ldapConnection === false) {
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throw new LdapException(trans('errors.ldap_cannot_connect'));
}
// Set any required options
if ($this->config['version']) {
$this->ldap->setVersion($ldapConnection, $this->config['version']);
}
$this->ldapConnection = $ldapConnection;
return $this->ldapConnection;
}
/**
* Build a filter string by injecting common variables.
* @param string $filterString
* @param array $attrs
* @return string
*/
protected function buildFilter($filterString, array $attrs)
{
$newAttrs = [];
foreach ($attrs as $key => $attrText) {
$newKey = '${' . $key . '}';
$newAttrs[$newKey] = $attrText;
}
return strtr($filterString, $newAttrs);
}
}