BookStack/app/Services/LdapService.php

124 lines
3.9 KiB
PHP

<?php namespace BookStack\Services;
use BookStack\Exceptions\LdapException;
use Illuminate\Contracts\Auth\Authenticatable;
class LdapService
{
protected $ldapConnection;
/**
* 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();
// Find user
$userFilter = $this->buildFilter(config('services.ldap.user_filter'), ['user' => $userName]);
$baseDn = config('services.ldap.base_dn');
$ldapSearch = ldap_search($ldapConnection, $baseDn, $userFilter, ['cn', 'uid', 'dn', 'mail']);
$users = ldap_get_entries($ldapConnection, $ldapSearch);
if ($users['count'] === 0) return null;
$user = $users[0];
return [
'uid' => $user['uid'][0],
'name' => $user['cn'][0],
'dn' => $user['dn'],
'email' => (isset($user['mail'])) ? $user['mail'][0] : 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();
$ldapBind = @ldap_bind($ldapConnection, $ldapUser['dn'], $password);
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 = config('services.ldap.dn');
$ldapPass = config('services.ldap.pass');
$isAnonymous = ($ldapDn === false || $ldapPass === false);
if ($isAnonymous) {
$ldapBind = ldap_bind($connection);
} else {
$ldapBind = ldap_bind($connection, $ldapDn, $ldapPass);
}
if (!$ldapBind) throw new LdapException('LDAP access failed using ' . $isAnonymous ? ' anonymous bind.' : ' given dn & pass details');
}
/**
* Get the connection to the LDAP server.
* Creates a new connection if one does not exist.
* @return resource
* @throws LdapException
*/
protected function getConnection()
{
if ($this->ldapConnection !== null) return $this->ldapConnection;
// Check LDAP extension in installed
if (!function_exists('ldap_connect')) {
throw new LdapException('LDAP PHP extension not installed');
}
// Get port from server string if specified.
$ldapServer = explode(':', config('services.ldap.server'));
$ldapConnection = ldap_connect($ldapServer[0], count($ldapServer) > 1 ? $ldapServer[1] : 389);
if ($ldapConnection === false) {
throw new LdapException('Cannot connect to ldap server, Initial connection failed');
}
// Set any required options
ldap_set_option($ldapConnection, LDAP_OPT_PROTOCOL_VERSION, 3); // TODO - make configurable
$this->ldapConnection = $ldapConnection;
return $this->ldapConnection;
}
/**
* Build a filter string by injecting common variables.
* @param $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);
}
}