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-rw-r--r--library/Icinga/Authentication/User/UserBackend.php259
1 files changed, 259 insertions, 0 deletions
diff --git a/library/Icinga/Authentication/User/UserBackend.php b/library/Icinga/Authentication/User/UserBackend.php
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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);
+ $backend = null;
+ switch ($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;
+ }
+}