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<?php
/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
namespace Icinga\Authentication\User;
use Icinga\Application\Config;
use Icinga\Application\Logger;
use Icinga\Application\Icinga;
use Icinga\Data\ConfigObject;
use Icinga\Data\ResourceFactory;
use Icinga\Exception\ConfigurationError;
use Icinga\Util\ConfigAwareFactory;
/**
* Factory for user backends
*/
class UserBackend implements ConfigAwareFactory
{
/**
* The default user backend types provided by Icinga Web 2
*
* @var array
*/
protected static $defaultBackends = array(
'external',
'db',
'ldap',
'msldap'
);
/**
* The registered custom user backends with their identifier as key and class name as value
*
* @var array
*/
protected static $customBackends;
/**
* User backend configuration
*
* @var Config
*/
private static $backends;
/**
* Set user backend configuration
*
* @param Config $config
*/
public static function setConfig($config)
{
self::$backends = $config;
}
/**
* Return the configuration of all existing user backends
*
* @return Config
*/
public static function getBackendConfigs()
{
self::assertBackendsExist();
return self::$backends;
}
/**
* Check if any user backends exist. If not, throw an error.
*
* @throws ConfigurationError
*/
private static function assertBackendsExist()
{
if (self::$backends === null) {
throw new ConfigurationError(
'User backends not set up. Please contact your Icinga Web administrator'
);
}
}
/**
* Register all custom user backends from all loaded modules
*/
protected static function registerCustomUserBackends()
{
if (static::$customBackends !== null) {
return;
}
static::$customBackends = array();
$providedBy = array();
foreach (Icinga::app()->getModuleManager()->getLoadedModules() as $module) {
foreach ($module->getUserBackends() as $identifier => $className) {
if (array_key_exists($identifier, $providedBy)) {
Logger::warning(
'Cannot register user backend of type "%s" provided by module "%s".'
. ' The type is already provided by module "%s"',
$identifier,
$module->getName(),
$providedBy[$identifier]
);
} elseif (in_array($identifier, static::$defaultBackends)) {
Logger::warning(
'Cannot register user backend of type "%s" provided by module "%s".'
. ' The type is a default type provided by Icinga Web 2',
$identifier,
$module->getName()
);
} else {
$providedBy[$identifier] = $module->getName();
static::$customBackends[$identifier] = $className;
}
}
}
}
/**
* Get config forms of all custom user backends
*/
public static function getCustomBackendConfigForms()
{
$customBackendConfigForms = [];
static::registerCustomUserBackends();
foreach (self::$customBackends as $customBackendType => $customBackendClass) {
if (method_exists($customBackendClass, 'getConfigurationFormClass')) {
$customBackendConfigForms[$customBackendType] = $customBackendClass::getConfigurationFormClass();
}
}
return $customBackendConfigForms;
}
/**
* Return the class for the given custom user backend
*
* @param string $identifier The identifier of the custom user backend
*
* @return string|null The name of the class or null in case there was no
* backend found with the given identifier
*
* @throws ConfigurationError In case the class associated to the given identifier does not exist
*/
protected static function getCustomUserBackend($identifier)
{
static::registerCustomUserBackends();
if (array_key_exists($identifier, static::$customBackends)) {
$className = static::$customBackends[$identifier];
if (! class_exists($className)) {
throw new ConfigurationError(
'Cannot utilize user backend of type "%s". Class "%s" does not exist',
$identifier,
$className
);
}
return $className;
}
}
/**
* Create and return a user backend with the given name and given configuration applied to it
*
* @param string $name
* @param ConfigObject $backendConfig
*
* @return UserBackendInterface
*
* @throws ConfigurationError
*/
public static function create($name, ConfigObject $backendConfig = null)
{
if ($backendConfig === null) {
self::assertBackendsExist();
if (self::$backends->hasSection($name)) {
$backendConfig = self::$backends->getSection($name);
} else {
throw new ConfigurationError('User backend "%s" does not exist', $name);
}
}
if ($backendConfig->name !== null) {
$name = $backendConfig->name;
}
if (! ($backendType = strtolower($backendConfig->backend))) {
throw new ConfigurationError(
'Authentication configuration for user backend "%s" is missing the \'backend\' directive',
$name
);
}
if ($backendType === 'external') {
$backend = new ExternalBackend($backendConfig);
$backend->setName($name);
return $backend;
}
if (in_array($backendType, static::$defaultBackends)) {
// The default backend check is the first one because of performance reasons:
// Do not attempt to load a custom user backend unless it's actually required
} elseif (($customClass = static::getCustomUserBackend($backendType)) !== null) {
$backend = new $customClass($backendConfig);
if (! is_a($backend, 'Icinga\Authentication\User\UserBackendInterface')) {
throw new ConfigurationError(
'Cannot utilize user backend of type "%s". Class "%s" does not implement UserBackendInterface',
$backendType,
$customClass
);
}
$backend->setName($name);
return $backend;
} else {
throw new ConfigurationError(
'Authentication configuration for user backend "%s" defines an invalid backend type.'
. ' Backend type "%s" is not supported',
$name,
$backendType
);
}
if ($backendConfig->resource === null) {
throw new ConfigurationError(
'Authentication configuration for user backend "%s" is missing the \'resource\' directive',
$name
);
}
$resourceConfig = ResourceFactory::getResourceConfig($backendConfig->resource);
if ($backendType === 'db' && $resourceConfig->db === 'mysql') {
$resourceConfig->charset = 'utf8mb4';
}
$resource = ResourceFactory::createResource($resourceConfig);
switch ($backendType) {
case 'db':
$backend = new DbUserBackend($resource);
break;
case 'msldap':
$backend = new LdapUserBackend($resource);
$backend->setBaseDn($backendConfig->base_dn);
$backend->setUserClass($backendConfig->get('user_class', 'user'));
$backend->setUserNameAttribute($backendConfig->get('user_name_attribute', 'sAMAccountName'));
$backend->setFilter($backendConfig->filter);
$backend->setDomain($backendConfig->domain);
break;
case 'ldap':
$backend = new LdapUserBackend($resource);
$backend->setBaseDn($backendConfig->base_dn);
$backend->setUserClass($backendConfig->get('user_class', 'inetOrgPerson'));
$backend->setUserNameAttribute($backendConfig->get('user_name_attribute', 'uid'));
$backend->setFilter($backendConfig->filter);
$backend->setDomain($backendConfig->domain);
break;
}
$backend->setName($name);
return $backend;
}
}
|
