Adding upstream version 2.11.4.upstream/2.11.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

23 files changed, 4265 insertions, 0 deletions

diff --git a/application/forms/Config/General/ApplicationConfigForm.php b/application/forms/Config/General/ApplicationConfigForm.php
new file mode 100644
index 0000000..0e5c700
--- /dev/null
+++ b/application/forms/Config/General/ApplicationConfigForm.php
@@ -0,0 +1,93 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\General;
+
+use Icinga\Application\Icinga;
+use Icinga\Data\ResourceFactory;
+use Icinga\Web\Form;
+
+/**
+ * Configuration form for general application options
+ *
+ * This form is not used directly but as subform to the {@link GeneralConfigForm}.
+ */
+class ApplicationConfigForm extends Form
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        $this->setName('form_config_general_application');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return  $this
+     */
+    public function createElements(array $formData)
+    {
+        $this->addElement(
+            'checkbox',
+            'global_show_stacktraces',
+            array(
+                'value'         => true,
+                'label'         => $this->translate('Show Stacktraces'),
+                'description'   => $this->translate(
+                    'Set whether to show an exception\'s stacktrace by default. This can also'
+                    . ' be set in a user\'s preferences with the appropriate permission.'
+                )
+            )
+        );
+
+        $this->addElement(
+            'checkbox',
+            'global_show_application_state_messages',
+            array(
+                'value'         => true,
+                'label'         => $this->translate('Show Application State Messages'),
+                'description'   => $this->translate(
+                    "Set whether to show application state messages."
+                    . " This can also be set in a user's preferences."
+                )
+            )
+        );
+
+        $this->addElement(
+            'text',
+            'global_module_path',
+            array(
+                'label'         => $this->translate('Module Path'),
+                'required'      => true,
+                'value'         => implode(':', Icinga::app()->getModuleManager()->getModuleDirs()),
+                'description'   => $this->translate(
+                    'Contains the directories that will be searched for available modules, separated by '
+                    . 'colons. Modules that don\'t exist in these directories can still be symlinked in '
+                    . 'the module folder, but won\'t show up in the list of disabled modules.'
+                )
+            )
+        );
+
+        $backends = array_keys(ResourceFactory::getResourceConfigs()->toArray());
+        $backends = array_combine($backends, $backends);
+
+        $this->addElement(
+            'select',
+            'global_config_resource',
+            array(
+                'required'      => true,
+                'multiOptions'  => array_merge(
+                    ['' => sprintf(' - %s - ', $this->translate('Please choose'))],
+                    $backends
+                ),
+                'disable'       => [''],
+                'value'         => '',
+                'label'         => $this->translate('Configuration Database')
+            )
+        );
+
+        return $this;
+    }
+}
diff --git a/application/forms/Config/General/DefaultAuthenticationDomainConfigForm.php b/application/forms/Config/General/DefaultAuthenticationDomainConfigForm.php
new file mode 100644
index 0000000..0ff6c32
--- /dev/null
+++ b/application/forms/Config/General/DefaultAuthenticationDomainConfigForm.php
@@ -0,0 +1,46 @@
+<?php
+/* Icinga Web 2 | (c) 2017 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\General;
+
+use Icinga\Web\Form;
+
+/**
+ * Configuration form for the default domain for authentication
+ *
+ * This form is not used directly but as subform to the {@link GeneralConfigForm}.
+ */
+class DefaultAuthenticationDomainConfigForm extends Form
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        $this->setName('form_config_general_authentication');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return  $this
+     */
+    public function createElements(array $formData)
+    {
+        $this->addElement(
+            'text',
+            'authentication_default_domain',
+            array(
+                'label'         => $this->translate('Default Login Domain'),
+                'description'   => $this->translate(
+                    'If a user logs in without specifying any domain (e.g. "jdoe" instead of "jdoe@example.com"),'
+                    . ' this default domain will be assumed for the user. Note that if none your LDAP authentication'
+                    . ' backends are configured to be responsible for this domain or if none of your authentication'
+                    . ' backends holds usernames with the domain part, users will not be able to login.'
+                )
+            )
+        );
+
+        return $this;
+    }
+}
diff --git a/application/forms/Config/General/LoggingConfigForm.php b/application/forms/Config/General/LoggingConfigForm.php
new file mode 100644
index 0000000..bbc7723
--- /dev/null
+++ b/application/forms/Config/General/LoggingConfigForm.php
@@ -0,0 +1,142 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\General;
+
+use Icinga\Application\Logger;
+use Icinga\Application\Logger\Writer\SyslogWriter;
+use Icinga\Application\Platform;
+use Icinga\Web\Form;
+
+/**
+ * Configuration form for logging options
+ *
+ * This form is not used directly but as subform for the {@link GeneralConfigForm}.
+ */
+class LoggingConfigForm extends Form
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        $this->setName('form_config_general_logging');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return  $this
+     */
+    public function createElements(array $formData)
+    {
+        $defaultType = getenv('ICINGAWEB_OFFICIAL_DOCKER_IMAGE') ? 'php' : 'syslog';
+
+        $this->addElement(
+            'select',
+            'logging_log',
+            array(
+                'required'      => true,
+                'autosubmit'    => true,
+                'label'         => $this->translate('Logging Type'),
+                'description'   => $this->translate('The type of logging to utilize.'),
+                'value'         => $defaultType,
+                'multiOptions'  => array(
+                    'syslog'    => 'Syslog',
+                    'php'       => $this->translate('Webserver Log', 'app.config.logging.type'),
+                    'file'      => $this->translate('File', 'app.config.logging.type'),
+                    'none'      => $this->translate('None', 'app.config.logging.type')
+                )
+            )
+        );
+
+        if (! isset($formData['logging_log']) || $formData['logging_log'] !== 'none') {
+            $this->addElement(
+                'select',
+                'logging_level',
+                array(
+                    'required'      => true,
+                    'label'         => $this->translate('Logging Level'),
+                    'description'   => $this->translate('The maximum logging level to emit.'),
+                    'multiOptions'  => array(
+                        Logger::$levels[Logger::ERROR]   => $this->translate('Error', 'app.config.logging.level'),
+                        Logger::$levels[Logger::WARNING] => $this->translate('Warning', 'app.config.logging.level'),
+                        Logger::$levels[Logger::INFO]    => $this->translate('Information', 'app.config.logging.level'),
+                        Logger::$levels[Logger::DEBUG]   => $this->translate('Debug', 'app.config.logging.level')
+                    )
+                )
+            );
+        }
+
+        if (! isset($formData['logging_log']) || in_array($formData['logging_log'], array('syslog', 'php'))) {
+            $this->addElement(
+                'text',
+                'logging_application',
+                array(
+                    'required'      => true,
+                    'label'         => $this->translate('Application Prefix'),
+                    'description'   => $this->translate(
+                        'The name of the application by which to prefix log messages.'
+                    ),
+                    'requirement'   => $this->translate('The application prefix must not contain whitespace.'),
+                    'value'         => 'icingaweb2',
+                    'validators'    => array(
+                        array(
+                            'Regex',
+                            false,
+                            array(
+                                'pattern'  => '/^\S+$/',
+                                'messages' => array(
+                                    'regexNotMatch' => $this->translate(
+                                        'The application prefix must not contain whitespace.'
+                                    )
+                                )
+                            )
+                        )
+                    )
+                )
+            );
+
+            if ((isset($formData['logging_log']) ? $formData['logging_log'] : $defaultType) === 'syslog') {
+                if (Platform::isWindows()) {
+                    /* @see https://secure.php.net/manual/en/function.openlog.php */
+                    $this->addElement(
+                        'hidden',
+                        'logging_facility',
+                        array(
+                            'value' => 'user',
+                            'disabled' => true
+                        )
+                    );
+                } else {
+                    $facilities = array_keys(SyslogWriter::$facilities);
+                    $this->addElement(
+                        'select',
+                        'logging_facility',
+                        array(
+                            'required' => true,
+                            'label' => $this->translate('Facility'),
+                            'description' => $this->translate('The syslog facility to utilize.'),
+                            'value' => 'user',
+                            'multiOptions' => array_combine($facilities, $facilities)
+                        )
+                    );
+                }
+            }
+        } elseif (isset($formData['logging_log']) && $formData['logging_log'] === 'file') {
+            $this->addElement(
+                'text',
+                'logging_file',
+                array(
+                    'required'      => true,
+                    'label'         => $this->translate('File path'),
+                    'description'   => $this->translate('The full path to the log file to write messages to.'),
+                    'value'         => '/var/log/icingaweb2/icingaweb2.log',
+                    'validators'    => array('WritablePathValidator')
+                )
+            );
+        }
+
+        return $this;
+    }
+}
diff --git a/application/forms/Config/General/ThemingConfigForm.php b/application/forms/Config/General/ThemingConfigForm.php
new file mode 100644
index 0000000..54ef2b1
--- /dev/null
+++ b/application/forms/Config/General/ThemingConfigForm.php
@@ -0,0 +1,78 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\General;
+
+use Icinga\Application\Icinga;
+use Icinga\Application\Logger;
+use Icinga\Web\Form;
+use Icinga\Web\StyleSheet;
+
+/**
+ * Configuration form for theming options
+ *
+ * This form is not used directly but as subform for the {@link GeneralConfigForm}.
+ */
+class ThemingConfigForm extends Form
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        $this->setName('form_config_general_theming');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return  $this
+     */
+    public function createElements(array $formData)
+    {
+        $themes = Icinga::app()->getThemes();
+        $themes[StyleSheet::DEFAULT_THEME] .= ' (' . $this->translate('default') . ')';
+
+        $this->addElement(
+            'select',
+            'themes_default',
+            array(
+                'description'   => $this->translate('The default theme', 'Form element description'),
+                'disabled'      => count($themes) < 2 ? 'disabled' : null,
+                'label'         => $this->translate('Default Theme', 'Form element label'),
+                'multiOptions'  => $themes,
+                'value'         => StyleSheet::DEFAULT_THEME
+            )
+        );
+
+        $this->addElement(
+            'checkbox',
+            'themes_disabled',
+            array(
+                'description'   => $this->translate(
+                    'Check this box for disallowing users to change the theme. If a default theme is set, it will be'
+                    . ' used nonetheless',
+                    'Form element description'
+                ),
+                'label'         => $this->translate('Users Can\'t Change Theme', 'Form element label')
+            )
+        );
+
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getValues($suppressArrayNotation = false)
+    {
+        $values = parent::getValues($suppressArrayNotation);
+        if ($values['themes_default'] === '' || $values['themes_default'] === StyleSheet::DEFAULT_THEME) {
+            $values['themes_default'] = null;
+        }
+        if (! $values['themes_disabled']) {
+            $values['themes_disabled'] = null;
+        }
+        return $values;
+    }
+}
diff --git a/application/forms/Config/GeneralConfigForm.php b/application/forms/Config/GeneralConfigForm.php
new file mode 100644
index 0000000..5f15512
--- /dev/null
+++ b/application/forms/Config/GeneralConfigForm.php
@@ -0,0 +1,40 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config;
+
+use Icinga\Forms\Config\General\ApplicationConfigForm;
+use Icinga\Forms\Config\General\DefaultAuthenticationDomainConfigForm;
+use Icinga\Forms\Config\General\LoggingConfigForm;
+use Icinga\Forms\Config\General\ThemingConfigForm;
+use Icinga\Forms\ConfigForm;
+
+/**
+ * Configuration form for application-wide options
+ */
+class GeneralConfigForm extends ConfigForm
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        $this->setName('form_config_general');
+        $this->setSubmitLabel($this->translate('Save Changes'));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function createElements(array $formData)
+    {
+        $appConfigForm = new ApplicationConfigForm();
+        $loggingConfigForm = new LoggingConfigForm();
+        $themingConfigForm = new ThemingConfigForm();
+        $domainConfigForm = new DefaultAuthenticationDomainConfigForm();
+        $this->addSubForm($appConfigForm->create($formData));
+        $this->addSubForm($loggingConfigForm->create($formData));
+        $this->addSubForm($themingConfigForm->create($formData));
+        $this->addSubForm($domainConfigForm->create($formData));
+    }
+}
diff --git a/application/forms/Config/Resource/DbResourceForm.php b/application/forms/Config/Resource/DbResourceForm.php
new file mode 100644
index 0000000..b9979ee
--- /dev/null
+++ b/application/forms/Config/Resource/DbResourceForm.php
@@ -0,0 +1,238 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\Resource;
+
+use Icinga\Application\Platform;
+use Icinga\Web\Form;
+
+/**
+ * Form class for adding/modifying database resources
+ */
+class DbResourceForm extends Form
+{
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_resource_db');
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * @param   array   $formData   The data sent by the user
+     */
+    public function createElements(array $formData)
+    {
+        $dbChoices = array();
+        if (Platform::hasMysqlSupport()) {
+            $dbChoices['mysql'] = 'MySQL';
+        }
+        if (Platform::hasPostgresqlSupport()) {
+            $dbChoices['pgsql'] = 'PostgreSQL';
+        }
+        if (Platform::hasMssqlSupport()) {
+            $dbChoices['mssql'] = 'MSSQL';
+        }
+        if (Platform::hasIbmSupport()) {
+            $dbChoices['ibm'] = 'IBM (DB2)';
+        }
+        if (Platform::hasOracleSupport()) {
+            $dbChoices['oracle'] = 'Oracle';
+        }
+        if (Platform::hasOciSupport()) {
+            $dbChoices['oci'] = 'Oracle (OCI8)';
+        }
+        if (Platform::hasSqliteSupport()) {
+            $dbChoices['sqlite'] = 'SQLite';
+        }
+
+        $offerPostgres = false;
+        $offerMysql = false;
+        $dbChoice = isset($formData['db']) ? $formData['db'] : key($dbChoices);
+        if ($dbChoice === 'pgsql') {
+            $offerPostgres = true;
+        } elseif ($dbChoice === 'mysql') {
+            $offerMysql = true;
+        }
+
+        if ($dbChoice === 'oracle') {
+            $hostIsRequired = false;
+        } else {
+            $hostIsRequired = true;
+        }
+
+        $socketInfo = '';
+        if ($offerPostgres) {
+            $socketInfo = $this->translate(
+                'For using unix domain sockets, specify the path to the unix domain socket directory'
+            );
+        } elseif ($offerMysql) {
+            $socketInfo = $this->translate(
+                'For using unix domain sockets, specify localhost'
+            );
+        }
+
+        $this->addElement(
+            'text',
+            'name',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Resource Name'),
+                'description'   => $this->translate('The unique name of this resource')
+            )
+        );
+        $this->addElement(
+            'select',
+            'db',
+            array(
+                'required'      => true,
+                'autosubmit'    => true,
+                'label'         => $this->translate('Database Type'),
+                'description'   => $this->translate('The type of SQL database'),
+                'multiOptions'  => $dbChoices
+            )
+        );
+        if ($dbChoice === 'sqlite') {
+            $this->addElement(
+                'text',
+                'dbname',
+                array(
+                    'required'      => true,
+                    'label'         => $this->translate('Database Name'),
+                    'description'   => $this->translate('The name of the database to use')
+                )
+            );
+        } else {
+            $this->addElement(
+                'text',
+                'host',
+                array (
+                    'required'      => $hostIsRequired,
+                    'label'         => $this->translate('Host'),
+                    'description'   => $this->translate('The hostname of the database')
+                        . ($socketInfo ? '. ' . $socketInfo : ''),
+                    'value'         => $hostIsRequired ? 'localhost' : ''
+                )
+            );
+            $this->addElement(
+                'number',
+                'port',
+                array(
+                    'description'       => $this->translate('The port to use'),
+                    'label'             => $this->translate('Port'),
+                    'preserveDefault'   => true,
+                    'required'          => $offerPostgres,
+                    'value'             => $offerPostgres ? 5432 : null
+                )
+            );
+            $this->addElement(
+                'text',
+                'dbname',
+                array(
+                    'required'      => true,
+                    'label'         => $this->translate('Database Name'),
+                    'description'   => $this->translate('The name of the database to use')
+                )
+            );
+            $this->addElement(
+                'text',
+                'username',
+                array (
+                    'required'      => true,
+                    'label'         => $this->translate('Username'),
+                    'description'   => $this->translate('The user name to use for authentication')
+                )
+            );
+            $this->addElement(
+                'password',
+                'password',
+                array(
+                    'required'          => true,
+                    'renderPassword'    => true,
+                    'label'             => $this->translate('Password'),
+                    'description'       => $this->translate('The password to use for authentication')
+                )
+            );
+            $this->addElement(
+                'text',
+                'charset',
+                array (
+                    'description'   => $this->translate('The character set for the database'),
+                    'label'         => $this->translate('Character Set')
+                )
+            );
+            $this->addElement(
+                'checkbox',
+                'use_ssl',
+                array(
+                    'autosubmit'    => true,
+                    'label'         => $this->translate('Use SSL'),
+                    'description'   => $this->translate(
+                        'Whether to encrypt the connection or to authenticate using certificates'
+                    )
+                )
+            );
+            if (isset($formData['use_ssl']) && $formData['use_ssl']) {
+                if (defined('\PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT')) {
+                    $this->addElement(
+                        'checkbox',
+                        'ssl_do_not_verify_server_cert',
+                        array(
+                            'label'             => $this->translate('SSL Do Not Verify Server Certificate'),
+                            'description'       => $this->translate(
+                                'Whether to disable verification of the server certificate'
+                            )
+                        )
+                    );
+                }
+                $this->addElement(
+                    'text',
+                    'ssl_key',
+                    array(
+                        'label'             => $this->translate('SSL Key'),
+                        'description'       => $this->translate('The client key file path')
+                    )
+                );
+                $this->addElement(
+                    'text',
+                    'ssl_cert',
+                    array(
+                        'label'             => $this->translate('SSL Certificate'),
+                        'description'       => $this->translate('The certificate file path')
+                    )
+                );
+                $this->addElement(
+                    'text',
+                    'ssl_ca',
+                    array(
+                        'label'             => $this->translate('SSL CA'),
+                        'description'       => $this->translate('The CA certificate file path')
+                    )
+                );
+                $this->addElement(
+                    'text',
+                    'ssl_capath',
+                    array(
+                        'label'             => $this->translate('SSL CA Path'),
+                        'description'       => $this->translate(
+                            'The trusted CA certificates in PEM format directory path'
+                        )
+                    )
+                );
+                $this->addElement(
+                    'text',
+                    'ssl_cipher',
+                    array(
+                        'label'             => $this->translate('SSL Cipher'),
+                        'description'       => $this->translate('The list of permissible ciphers')
+                    )
+                );
+            }
+        }
+
+        return $this;
+    }
+}
diff --git a/application/forms/Config/Resource/FileResourceForm.php b/application/forms/Config/Resource/FileResourceForm.php
new file mode 100644
index 0000000..b98f1b4
--- /dev/null
+++ b/application/forms/Config/Resource/FileResourceForm.php
@@ -0,0 +1,67 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\Resource;
+
+use Zend_Validate_Callback;
+use Icinga\Web\Form;
+
+/**
+ * Form class for adding/modifying file resources
+ */
+class FileResourceForm extends Form
+{
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_resource_file');
+    }
+
+    /**
+     * @see Form::createElements()
+     */
+    public function createElements(array $formData)
+    {
+        $this->addElement(
+            'text',
+            'name',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Resource Name'),
+                'description'   => $this->translate('The unique name of this resource')
+            )
+        );
+        $this->addElement(
+            'text',
+            'filename',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Filepath'),
+                'description'   => $this->translate('The filename to fetch information from'),
+                'validators'    => array('ReadablePathValidator')
+            )
+        );
+        $callbackValidator = new Zend_Validate_Callback(function ($value) {
+            return @preg_match($value, '') !== false;
+        });
+        $callbackValidator->setMessage(
+            $this->translate('"%value%" is not a valid regular expression.'),
+            Zend_Validate_Callback::INVALID_VALUE
+        );
+        $this->addElement(
+            'text',
+            'fields',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Pattern'),
+                'description'   => $this->translate('The pattern by which to identify columns.'),
+                'requirement'   => $this->translate('The column pattern must be a valid regular expression.'),
+                'validators'    => array($callbackValidator)
+            )
+        );
+
+        return $this;
+    }
+}
diff --git a/application/forms/Config/Resource/LdapResourceForm.php b/application/forms/Config/Resource/LdapResourceForm.php
new file mode 100644
index 0000000..7ffccdc
--- /dev/null
+++ b/application/forms/Config/Resource/LdapResourceForm.php
@@ -0,0 +1,129 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\Resource;
+
+use Icinga\Web\Form;
+use Icinga\Web\Url;
+use Icinga\Protocol\Ldap\LdapConnection;
+
+/**
+ * Form class for adding/modifying ldap resources
+ */
+class LdapResourceForm extends Form
+{
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_resource_ldap');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function createElements(array $formData)
+    {
+        $defaultPort = ! array_key_exists('encryption', $formData) || $formData['encryption'] !== LdapConnection::LDAPS
+            ? 389
+            : 636;
+
+        $this->addElement(
+            'text',
+            'name',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Resource Name'),
+                'description'   => $this->translate('The unique name of this resource')
+            )
+        );
+        $this->addElement(
+            'text',
+            'hostname',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Host'),
+                'description'   => $this->translate(
+                    'The hostname or address of the LDAP server to use for authentication.'
+                    . ' You can also provide multiple hosts separated by a space'
+                ),
+                'value'         => 'localhost'
+            )
+        );
+        $this->addElement(
+            'number',
+            'port',
+            array(
+                'required'          => true,
+                'preserveDefault'   => true,
+                'label'             => $this->translate('Port'),
+                'description'       => $this->translate('The port of the LDAP server to use for authentication'),
+                'value'             => $defaultPort
+            )
+        );
+        $this->addElement(
+            'select',
+            'encryption',
+            array(
+                'required'      => true,
+                'autosubmit'    => true,
+                'label'         => $this->translate('Encryption'),
+                'description'   => $this->translate(
+                    'Whether to encrypt communication. Choose STARTTLS or LDAPS for encrypted communication or'
+                    . ' none for unencrypted communication'
+                ),
+                'multiOptions'  => array(
+                    'none'                      => $this->translate('None', 'resource.ldap.encryption'),
+                    LdapConnection::STARTTLS    => 'STARTTLS',
+                    LdapConnection::LDAPS       => 'LDAPS'
+                )
+            )
+        );
+
+        $this->addElement(
+            'text',
+            'root_dn',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Root DN'),
+                'description'   => $this->translate(
+                    'Only the root and its child nodes will be accessible on this resource.'
+                )
+            )
+        );
+        $this->addElement(
+            'text',
+            'bind_dn',
+            array(
+                'label'         => $this->translate('Bind DN'),
+                'description'   => $this->translate(
+                    'The user dn to use for querying the ldap server. Leave the dn and password empty for attempting'
+                    . ' an anonymous bind'
+                )
+            )
+        );
+        $this->addElement(
+            'password',
+            'bind_pw',
+            array(
+                'renderPassword'    => true,
+                'label'             => $this->translate('Bind Password'),
+                'description'       => $this->translate('The password to use for querying the ldap server')
+            )
+        );
+
+        $this->addElement(
+            'number',
+            'timeout',
+            array(
+                'preserveDefault'   => true,
+                'label'             => $this->translate('Timeout'),
+                'description'       => $this->translate('Connection timeout for every LDAP connection'),
+                'value'             => 5 // see LdapConnection::__construct()
+            )
+        );
+
+        return $this;
+    }
+}
diff --git a/application/forms/Config/Resource/SshResourceForm.php b/application/forms/Config/Resource/SshResourceForm.php
new file mode 100644
index 0000000..a15dc8c
--- /dev/null
+++ b/application/forms/Config/Resource/SshResourceForm.php
@@ -0,0 +1,148 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\Resource;
+
+use Icinga\Application\Icinga;
+use Icinga\Data\ConfigObject;
+use Icinga\Forms\Config\ResourceConfigForm;
+use Icinga\Web\Form;
+use Icinga\Util\File;
+use Zend_Validate_Callback;
+
+/**
+ * Form class for adding/modifying ssh identity resources
+ */
+class SshResourceForm extends Form
+{
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_resource_ssh');
+    }
+
+    /**
+     * @see Form::createElements()
+     */
+    public function createElements(array $formData)
+    {
+        $this->addElement(
+            'text',
+            'name',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Resource Name'),
+                'description'   => $this->translate('The unique name of this resource')
+            )
+        );
+        $this->addElement(
+            'text',
+            'user',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('User'),
+                'description'   => $this->translate(
+                    'User to log in as on the remote Icinga instance. Please note that key-based SSH login must be'
+                    . ' possible for this user'
+                )
+            )
+        );
+
+        if ($this->getRequest()->getActionName() != 'editresource') {
+            $callbackValidator = new Zend_Validate_Callback(function ($value) {
+                if (substr(ltrim($value), 0, 7) === 'file://'
+                    || openssl_pkey_get_private($value) === false
+                ) {
+                    return false;
+                }
+
+                return true;
+            });
+            $callbackValidator->setMessage(
+                $this->translate('The given SSH key is invalid'),
+                Zend_Validate_Callback::INVALID_VALUE
+            );
+
+            $this->addElement(
+                'textarea',
+                'private_key',
+                array(
+                    'required'      => true,
+                    'label'         => $this->translate('Private Key'),
+                    'description'   => $this->translate('The private key which will be used for the SSH connections'),
+                    'class'         => 'resource ssh-identity',
+                    'validators'    => array($callbackValidator)
+                )
+            );
+        } else {
+            $resourceName = $formData['name'];
+            $this->addElement(
+                'note',
+                'private_key_note',
+                array(
+                    'escape'        => false,
+                    'label'         => $this->translate('Private Key'),
+                    'value'         => sprintf(
+                        '<a href="%1$s" data-base-target="_next" title="%2$s" aria-label="%2$s">%3$s</a>',
+                        $this->getView()->url('config/removeresource', array('resource' => $resourceName)),
+                        $this->getView()->escape(sprintf($this->translate(
+                            'Remove the %s resource'
+                        ), $resourceName)),
+                        $this->translate('To modify the private key you must recreate this resource.')
+                    )
+                )
+            );
+        }
+
+        return $this;
+    }
+
+    /**
+     * Remove the assigned key to the resource
+     *
+     * @param ConfigObject $config
+     *
+     * @return bool
+     */
+    public static function beforeRemove(ConfigObject $config)
+    {
+        $file = $config->private_key;
+
+        if (file_exists($file)) {
+            unlink($file);
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Creates the assigned key to the resource
+     *
+     * @param ResourceConfigForm $form
+     *
+     * @return bool
+     */
+    public static function beforeAdd(ResourceConfigForm $form)
+    {
+        $configDir = Icinga::app()->getConfigDir();
+        $user = $form->getElement('user')->getValue();
+
+        $filePath = join(DIRECTORY_SEPARATOR, [$configDir, 'ssh', sha1($user)]);
+        if (! file_exists($filePath)) {
+            $file = File::create($filePath, 0600);
+        } else {
+            $form->error(
+                sprintf($form->translate('The private key for the user "%s" already exists.'), $user)
+            );
+            return false;
+        }
+
+        $file->fwrite($form->getElement('private_key')->getValue());
+
+        $form->getElement('private_key')->setValue($filePath);
+
+        return true;
+    }
+}
diff --git a/application/forms/Config/ResourceConfigForm.php b/application/forms/Config/ResourceConfigForm.php
new file mode 100644
index 0000000..fe12aca
--- /dev/null
+++ b/application/forms/Config/ResourceConfigForm.php
@@ -0,0 +1,441 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config;
+
+use Icinga\Application\Config;
+use InvalidArgumentException;
+use Icinga\Application\Platform;
+use Icinga\Exception\ConfigurationError;
+use Icinga\Data\ConfigObject;
+use Icinga\Data\Inspectable;
+use Icinga\Data\Inspection;
+use Icinga\Data\ResourceFactory;
+use Icinga\Forms\ConfigForm;
+use Icinga\Forms\Config\Resource\DbResourceForm;
+use Icinga\Forms\Config\Resource\FileResourceForm;
+use Icinga\Forms\Config\Resource\LdapResourceForm;
+use Icinga\Forms\Config\Resource\SshResourceForm;
+use Icinga\Web\Form;
+use Icinga\Web\Notification;
+
+class ResourceConfigForm extends ConfigForm
+{
+    /**
+     * Bogus password when inspecting password elements
+     *
+     * @var string
+     */
+    protected static $dummyPassword = '_web_form_5847ed1b5b8ca';
+
+    /**
+     * If the global config must be updated because a resource has been changed, this is the updated global config
+     *
+     * @var Config|null
+     */
+    protected $updatedAppConfig = null;
+
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_resource');
+        $this->setSubmitLabel($this->translate('Save Changes'));
+        $this->setValidatePartial(true);
+    }
+
+    /**
+     * Return a form object for the given resource type
+     *
+     * @param   string      $type      The resource type for which to return a form
+     *
+     * @return  Form
+     */
+    public function getResourceForm($type)
+    {
+        if ($type === 'db') {
+            return new DbResourceForm();
+        } elseif ($type === 'ldap') {
+            return new LdapResourceForm();
+        } elseif ($type === 'file') {
+            return new FileResourceForm();
+        } elseif ($type === 'ssh') {
+            return new SshResourceForm();
+        } else {
+            throw new InvalidArgumentException(sprintf($this->translate('Invalid resource type "%s" provided'), $type));
+        }
+    }
+
+    /**
+     * Add a particular resource
+     *
+     * The backend to add is identified by the array-key `name'.
+     *
+     * @param   array   $values             The values to extend the configuration with
+     *
+     * @return  $this
+     *
+     * @throws  InvalidArgumentException    In case the resource does already exist
+     */
+    public function add(array $values)
+    {
+        $name = isset($values['name']) ? $values['name'] : '';
+        if (! $name) {
+            throw new InvalidArgumentException($this->translate('Resource name missing'));
+        } elseif ($this->config->hasSection($name)) {
+            throw new InvalidArgumentException($this->translate('Resource already exists'));
+        }
+
+        unset($values['name']);
+        $this->config->setSection($name, $values);
+        return $this;
+    }
+
+    /**
+     * Edit a particular resource
+     *
+     * @param   string      $name           The name of the resource to edit
+     * @param   array       $values         The values to edit the configuration with
+     *
+     * @return  array                       The edited configuration
+     *
+     * @throws  InvalidArgumentException    In case the resource does not exist
+     */
+    public function edit($name, array $values)
+    {
+        if (! $name) {
+            throw new InvalidArgumentException($this->translate('Old resource name missing'));
+        } elseif (! ($newName = isset($values['name']) ? $values['name'] : '')) {
+            throw new InvalidArgumentException($this->translate('New resource name missing'));
+        } elseif (! $this->config->hasSection($name)) {
+            throw new InvalidArgumentException($this->translate('Unknown resource provided'));
+        }
+
+        $resourceConfig = $this->config->getSection($name);
+        $this->config->removeSection($name);
+        unset($values['name']);
+        $this->config->setSection($newName, $resourceConfig->merge($values));
+
+        if ($newName !== $name) {
+            $appConfig = Config::app();
+            $section = $appConfig->getSection('global');
+            if ($section->config_resource === $name) {
+                $section->config_resource = $newName;
+                $this->updatedAppConfig = $appConfig->setSection('global', $section);
+            }
+        }
+
+        return $resourceConfig;
+    }
+
+    /**
+     * Remove a particular resource
+     *
+     * @param   string      $name           The name of the resource to remove
+     *
+     * @return  array                       The removed resource configuration
+     *
+     * @throws  InvalidArgumentException    In case the resource does not exist
+     */
+    public function remove($name)
+    {
+        if (! $name) {
+            throw new InvalidArgumentException($this->translate('Resource name missing'));
+        } elseif (! $this->config->hasSection($name)) {
+            throw new InvalidArgumentException($this->translate('Unknown resource provided'));
+        }
+
+        $resourceConfig = $this->config->getSection($name);
+        $resourceForm = $this->getResourceForm($resourceConfig->type);
+        if (method_exists($resourceForm, 'beforeRemove')) {
+            $resourceForm::beforeRemove($resourceConfig);
+        }
+
+        $this->config->removeSection($name);
+        return $resourceConfig;
+    }
+
+    /**
+     * Add or edit a resource and save the configuration
+     *
+     * Performs a connectivity validation using the submitted values. A checkbox is
+     * added to the form to skip the check if it fails and redirection is aborted.
+     *
+     * @see Form::onSuccess()
+     */
+    public function onSuccess()
+    {
+        $resourceForm = $this->getResourceForm($this->getElement('type')->getValue());
+
+        if (($el = $this->getElement('force_creation')) === null || false === $el->isChecked()) {
+            $inspection = static::inspectResource($this);
+            if ($inspection !== null && $inspection->hasError()) {
+                $this->error($inspection->getError());
+                $this->addElement($this->getForceCreationCheckbox());
+                return false;
+            }
+        }
+
+        $resource = $this->request->getQuery('resource');
+        try {
+            if ($resource === null) { // create new resource
+                if (method_exists($resourceForm, 'beforeAdd')) {
+                    if (! $resourceForm::beforeAdd($this)) {
+                        return false;
+                    }
+                }
+                $this->add(static::transformEmptyValuesToNull($this->getValues()));
+                $message = $this->translate('Resource "%s" has been successfully created');
+            } else { // edit existing resource
+                $this->edit($resource, static::transformEmptyValuesToNull($this->getValues()));
+                $message = $this->translate('Resource "%s" has been successfully changed');
+            }
+        } catch (InvalidArgumentException $e) {
+            Notification::error($e->getMessage());
+            return false;
+        }
+
+        if ($this->save()) {
+            Notification::success(sprintf($message, $this->getElement('name')->getValue()));
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Populate the form in case a resource is being edited
+     *
+     * @see Form::onRequest()
+     *
+     * @throws  ConfigurationError      In case the backend name is missing in the request or is invalid
+     */
+    public function onRequest()
+    {
+        $resource = $this->request->getQuery('resource');
+        if ($resource !== null) {
+            if ($resource === '') {
+                throw new ConfigurationError($this->translate('Resource name missing'));
+            } elseif (! $this->config->hasSection($resource)) {
+                throw new ConfigurationError($this->translate('Unknown resource provided'));
+            }
+            $configValues = $this->config->getSection($resource)->toArray();
+            $configValues['name'] = $resource;
+            $this->populate($configValues);
+            foreach ($this->getElements() as $element) {
+                if ($element->getType() === 'Zend_Form_Element_Password' && strlen($element->getValue())) {
+                    $element->setValue(static::$dummyPassword);
+                }
+            }
+        }
+    }
+
+    /**
+     * Return a checkbox to be displayed at the beginning of the form
+     * which allows the user to skip the connection validation
+     *
+     * @return  Zend_Form_Element
+     */
+    protected function getForceCreationCheckbox()
+    {
+        return $this->createElement(
+            'checkbox',
+            'force_creation',
+            array(
+                'order'         => 0,
+                'ignore'        => true,
+                'label'         => $this->translate('Force Changes'),
+                'description'   => $this->translate('Check this box to enforce changes without connectivity validation')
+            )
+        );
+    }
+
+    /**
+     * @see Form::createElemeents()
+     */
+    public function createElements(array $formData)
+    {
+        $resourceType = isset($formData['type']) ? $formData['type'] : 'db';
+
+        $resourceTypes = array(
+            'file'          => $this->translate('File'),
+            'ssh'           => $this->translate('SSH Identity'),
+        );
+        if ($resourceType === 'ldap' || Platform::hasLdapSupport()) {
+            $resourceTypes['ldap'] = 'LDAP';
+        }
+        if ($resourceType === 'db' || Platform::hasDatabaseSupport()) {
+            $resourceTypes['db'] = $this->translate('SQL Database');
+        }
+
+        $this->addElement(
+            'select',
+            'type',
+            array(
+                'required'          => true,
+                'autosubmit'        => true,
+                'label'             => $this->translate('Resource Type'),
+                'description'       => $this->translate('The type of resource'),
+                'multiOptions'      => $resourceTypes,
+                'value'             => $resourceType
+            )
+        );
+
+        if (isset($formData['force_creation']) && $formData['force_creation']) {
+            // In case another error occured and the checkbox was displayed before
+            $this->addElement($this->getForceCreationCheckbox());
+        }
+
+        $this->addElements($this->getResourceForm($resourceType)->createElements($formData)->getElements());
+    }
+
+    /**
+     * Create a resource by using the given form's values and return its inspection results
+     *
+     * @param   Form    $form
+     *
+     * @return  Inspection
+     */
+    public static function inspectResource(Form $form)
+    {
+        if ($form->getValue('type') !== 'ssh') {
+            $resource = ResourceFactory::createResource(new ConfigObject($form->getValues()));
+            if ($resource instanceof Inspectable) {
+                return $resource->inspect();
+            }
+        }
+    }
+
+    /**
+     * Run the configured resource's inspection checks and show the result, if necessary
+     *
+     * This will only run any validation if the user pushed the 'resource_validation' button.
+     *
+     * @param   array   $formData
+     *
+     * @return  bool
+     */
+    public function isValidPartial(array $formData)
+    {
+        if ($this->getElement('resource_validation')->isChecked() && parent::isValid($formData)) {
+            $inspection = static::inspectResource($this);
+            if ($inspection !== null) {
+                $join = function ($e) use (&$join) {
+                    return is_array($e) ? join("\n", array_map($join, $e)) : $e;
+                };
+                $this->addElement(
+                    'note',
+                    'inspection_output',
+                    array(
+                        'order'         => 0,
+                        'value'         => '<strong>' . $this->translate('Validation Log') . "</strong>\n\n"
+                            . join("\n", array_map($join, $inspection->toArray())),
+                        'decorators'    => array(
+                            'ViewHelper',
+                            array('HtmlTag', array('tag' => 'pre', 'class' => 'log-output')),
+                        )
+                    )
+                );
+
+                if ($inspection->hasError()) {
+                    $this->warning(sprintf(
+                        $this->translate('Failed to successfully validate the configuration: %s'),
+                        $inspection->getError()
+                    ));
+                    return false;
+                }
+            }
+
+            $this->info($this->translate('The configuration has been successfully validated.'));
+        }
+
+        return true;
+    }
+
+    /**
+     * Add a submit button to this form and one to manually validate the configuration
+     *
+     * Calls parent::addSubmitButton() to add the submit button.
+     *
+     * @return  $this
+     */
+    public function addSubmitButton()
+    {
+        parent::addSubmitButton()
+            ->getElement('btn_submit')
+            ->setDecorators(array('ViewHelper'));
+
+        $this->addElement(
+            'submit',
+            'resource_validation',
+            array(
+                'ignore'                => true,
+                'label'                 => $this->translate('Validate Configuration'),
+                'data-progress-label'   => $this->translate('Validation In Progress'),
+                'decorators'            => array('ViewHelper')
+            )
+        );
+
+        $this->setAttrib('data-progress-element', 'resource-progress');
+        $this->addElement(
+            'note',
+            'resource-progress',
+            array(
+                'decorators'    => array(
+                    'ViewHelper',
+                    array('Spinner', array('id' => 'resource-progress'))
+                )
+            )
+        );
+
+        $this->addDisplayGroup(
+            array('btn_submit', 'resource_validation', 'resource-progress'),
+            'submit_validation',
+            array(
+                'decorators' => array(
+                    'FormElements',
+                    array('HtmlTag', array('tag' => 'div', 'class' => 'control-group form-controls'))
+                )
+            )
+        );
+
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getValues($suppressArrayNotation = false)
+    {
+        $values = parent::getValues($suppressArrayNotation);
+        $resource = $this->request->getQuery('resource');
+        if ($resource !== null && $this->config->hasSection($resource)) {
+            $resourceConfig = $this->config->getSection($resource)->toArray();
+            foreach ($this->getElements() as $element) {
+                if ($element->getType() === 'Zend_Form_Element_Password') {
+                    $name = $element->getName();
+                    if (isset($values[$name]) && $values[$name] === static::$dummyPassword) {
+                        if (isset($resourceConfig[$name])) {
+                            $values[$name] = $resourceConfig[$name];
+                        } else {
+                            unset($values[$name]);
+                        }
+                    }
+                }
+            }
+        }
+
+        return $values;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function writeConfig(Config $config)
+    {
+        parent::writeConfig($config);
+        if ($this->updatedAppConfig !== null) {
+            $this->updatedAppConfig->saveIni();
+        }
+    }
+}
diff --git a/application/forms/Config/User/CreateMembershipForm.php b/application/forms/Config/User/CreateMembershipForm.php
new file mode 100644
index 0000000..2828e95
--- /dev/null
+++ b/application/forms/Config/User/CreateMembershipForm.php
@@ -0,0 +1,191 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\User;
+
+use Exception;
+use Icinga\Application\Logger;
+use Icinga\Data\DataArray\ArrayDatasource;
+use Icinga\Web\Form;
+use Icinga\Web\Notification;
+
+/**
+ * Form for creating one or more group memberships
+ */
+class CreateMembershipForm extends Form
+{
+    /**
+     * The user group backends to fetch groups from
+     *
+     * Each backend must implement the Icinga\Data\Extensible and Icinga\Data\Selectable interface.
+     *
+     * @var array
+     */
+    protected $backends;
+
+    /**
+     * The username to create memberships for
+     *
+     * @var string
+     */
+    protected $userName;
+
+    /**
+     * Set the user group backends to fetch groups from
+     *
+     * @param   array   $backends
+     *
+     * @return  $this
+     */
+    public function setBackends($backends)
+    {
+        $this->backends = $backends;
+        return $this;
+    }
+
+    /**
+     * Set the username to create memberships for
+     *
+     * @param   string  $userName
+     *
+     * @return  $this
+     */
+    public function setUsername($userName)
+    {
+        $this->userName = $userName;
+        return $this;
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * @param   array   $formData   The data sent by the user
+     */
+    public function createElements(array $formData)
+    {
+        $query = $this->createDataSource()->select()->from('group', array('group_name', 'backend_name'));
+
+        $options = array();
+        foreach ($query as $row) {
+            $options[$row->backend_name . ';' . $row->group_name] = $row->group_name . ' (' . $row->backend_name . ')';
+        }
+
+        $this->addElement(
+            'multiselect',
+            'groups',
+            array(
+                'required'      => true,
+                'multiOptions'  => $options,
+                'label'         => $this->translate('Groups'),
+                'description'   => sprintf(
+                    $this->translate('Select one or more groups where to add %s as member'),
+                    $this->userName
+                ),
+                'class'         => 'grant-permissions'
+            )
+        );
+
+        $this->setTitle(sprintf($this->translate('Create memberships for %s'), $this->userName));
+        $this->setSubmitLabel($this->translate('Create'));
+    }
+
+    /**
+     * Instantly redirect back in case the user is already a member of all groups
+     */
+    public function onRequest()
+    {
+        if ($this->createDataSource()->select()->from('group')->count() === 0) {
+            Notification::info(sprintf($this->translate('User %s is already a member of all groups'), $this->userName));
+            $this->getResponse()->redirectAndExit($this->getRedirectUrl());
+        }
+    }
+
+    /**
+     * Create the memberships for the user
+     *
+     * @return  bool
+     */
+    public function onSuccess()
+    {
+        $backendMap = array();
+        foreach ($this->backends as $backend) {
+            $backendMap[$backend->getName()] = $backend;
+        }
+
+        $single = null;
+        foreach ($this->getValue('groups') as $backendAndGroup) {
+            list($backendName, $groupName) = explode(';', $backendAndGroup, 2);
+            try {
+                $backendMap[$backendName]->insert(
+                    'group_membership',
+                    array(
+                        'group_name'    => $groupName,
+                        'user_name'     => $this->userName
+                    )
+                );
+            } catch (Exception $e) {
+                Notification::error(sprintf(
+                    $this->translate('Failed to add "%s" as group member for "%s"'),
+                    $this->userName,
+                    $groupName
+                ));
+                $this->error($e->getMessage());
+                return false;
+            }
+
+            $single = $single === null;
+        }
+
+        if ($single) {
+            Notification::success(
+                sprintf($this->translate('Membership for group %s created successfully'), $groupName)
+            );
+        } else {
+            Notification::success($this->translate('Memberships created successfully'));
+        }
+
+        return true;
+    }
+
+    /**
+     * Create and return a data source to fetch all groups from all backends where the user is not already a member of
+     *
+     * @return  ArrayDatasource
+     */
+    protected function createDataSource()
+    {
+        $groups = $failures = array();
+        foreach ($this->backends as $backend) {
+            try {
+                $memberships = $backend
+                    ->select()
+                    ->from('group_membership', array('group_name'))
+                    ->where('user_name', $this->userName)
+                    ->fetchColumn();
+                foreach ($backend->select(array('group_name')) as $row) {
+                    if (! in_array($row->group_name, $memberships)) { // TODO(jom): Apply this as native query filter
+                        $row->backend_name = $backend->getName();
+                        $groups[] = $row;
+                    }
+                }
+            } catch (Exception $e) {
+                $failures[] = array($backend->getName(), $e);
+            }
+        }
+
+        if (empty($groups) && !empty($failures)) {
+            // In case there are only failures, throw the very first exception again
+            throw $failures[0][1];
+        } elseif (! empty($failures)) {
+            foreach ($failures as $failure) {
+                Logger::error($failure[1]);
+                Notification::warning(sprintf(
+                    $this->translate('Failed to fetch any groups from backend %s. Please check your log'),
+                    $failure[0]
+                ));
+            }
+        }
+
+        return new ArrayDatasource($groups);
+    }
+}
diff --git a/application/forms/Config/User/UserForm.php b/application/forms/Config/User/UserForm.php
new file mode 100644
index 0000000..fb2ef4d
--- /dev/null
+++ b/application/forms/Config/User/UserForm.php
@@ -0,0 +1,210 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\User;
+
+use Icinga\Application\Hook\ConfigFormEventsHook;
+use Icinga\Data\Filter\Filter;
+use Icinga\Forms\RepositoryForm;
+use Icinga\Web\Notification;
+
+class UserForm extends RepositoryForm
+{
+    /**
+     * Create and add elements to this form to insert or update a user
+     *
+     * @param   array   $formData   The data sent by the user
+     */
+    protected function createInsertElements(array $formData)
+    {
+        $this->addElement(
+            'checkbox',
+            'is_active',
+            array(
+                'value'         => true,
+                'label'         => $this->translate('Active'),
+                'description'   => $this->translate('Prevents the user from logging in if unchecked')
+            )
+        );
+        $this->addElement(
+            'text',
+            'user_name',
+            array(
+                'required'  => true,
+                'label'     => $this->translate('Username')
+            )
+        );
+        $this->addElement(
+            'password',
+            'password',
+            array(
+                'required'  => true,
+                'label'     => $this->translate('Password')
+            )
+        );
+
+        $this->setTitle($this->translate('Add a new user'));
+        $this->setSubmitLabel($this->translate('Add'));
+    }
+
+    /**
+     * Create and add elements to this form to update a user
+     *
+     * @param   array   $formData   The data sent by the user
+     */
+    protected function createUpdateElements(array $formData)
+    {
+        $this->createInsertElements($formData);
+
+        $this->addElement(
+            'password',
+            'password',
+            array(
+                'description'   => $this->translate('Leave empty for not updating the user\'s password'),
+                'label'         => $this->translate('Password'),
+            )
+        );
+
+        $this->setTitle(sprintf($this->translate('Edit user %s'), $this->getIdentifier()));
+        $this->setSubmitLabel($this->translate('Save'));
+    }
+
+    /**
+     * Update a user
+     *
+     * @return  bool
+     */
+    protected function onUpdateSuccess()
+    {
+        if (parent::onUpdateSuccess()) {
+            if (($newName = $this->getValue('user_name')) !== $this->getIdentifier()) {
+                $this->getRedirectUrl()->setParam('user', $newName);
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Retrieve all form element values
+     *
+     * Strips off the password if null or the empty string.
+     *
+     * @param   bool    $suppressArrayNotation
+     *
+     * @return  array
+     */
+    public function getValues($suppressArrayNotation = false)
+    {
+        $values = parent::getValues($suppressArrayNotation);
+        // before checking if password values is empty
+        // we have to check that the password field is set
+        // otherwise an error is thrown
+        if (isset($values['password']) && ! $values['password']) {
+            unset($values['password']);
+        }
+
+        return $values;
+    }
+
+    /**
+     * Create and add elements to this form to delete a user
+     *
+     * @param   array   $formData   The data sent by the user
+     */
+    protected function createDeleteElements(array $formData)
+    {
+        $this->setTitle(sprintf($this->translate('Remove user %s?'), $this->getIdentifier()));
+        $this->setSubmitLabel($this->translate('Yes'));
+        $this->setAttrib('class', 'icinga-controls');
+    }
+
+    /**
+     * Create and return a filter to use when updating or deleting a user
+     *
+     * @return  Filter
+     */
+    protected function createFilter()
+    {
+        return Filter::where('user_name', $this->getIdentifier());
+    }
+
+    /**
+     * Return a notification message to use when inserting a user
+     *
+     * @param   bool    $success    true or false, whether the operation was successful
+     *
+     * @return  string
+     */
+    protected function getInsertMessage($success)
+    {
+        if ($success) {
+            return $this->translate('User added successfully');
+        } else {
+            return $this->translate('Failed to add user');
+        }
+    }
+
+    /**
+     * Return a notification message to use when updating a user
+     *
+     * @param   bool    $success    true or false, whether the operation was successful
+     *
+     * @return  string
+     */
+    protected function getUpdateMessage($success)
+    {
+        if ($success) {
+            return sprintf($this->translate('User "%s" has been edited'), $this->getIdentifier());
+        } else {
+            return sprintf($this->translate('Failed to edit user "%s"'), $this->getIdentifier());
+        }
+    }
+
+    /**
+     * Return a notification message to use when deleting a user
+     *
+     * @param   bool    $success    true or false, whether the operation was successful
+     *
+     * @return  string
+     */
+    protected function getDeleteMessage($success)
+    {
+        if ($success) {
+            return sprintf($this->translate('User "%s" has been removed'), $this->getIdentifier());
+        } else {
+            return sprintf($this->translate('Failed to remove user "%s"'), $this->getIdentifier());
+        }
+    }
+
+    public function isValid($formData)
+    {
+        $valid = parent::isValid($formData);
+
+        if ($valid && ConfigFormEventsHook::runIsValid($this) === false) {
+            foreach (ConfigFormEventsHook::getLastErrors() as $msg) {
+                $this->error($msg);
+            }
+
+            $valid = false;
+        }
+
+        return $valid;
+    }
+
+    public function onSuccess()
+    {
+        if (parent::onSuccess() === false) {
+            return false;
+        }
+
+        if (ConfigFormEventsHook::runOnSuccess($this) === false) {
+            Notification::error($this->translate(
+                'Configuration successfully stored. Though, one or more module hooks failed to run.'
+                . ' See logs for details'
+            ));
+        }
+    }
+}
diff --git a/application/forms/Config/UserBackend/DbBackendForm.php b/application/forms/Config/UserBackend/DbBackendForm.php
new file mode 100644
index 0000000..693ea14
--- /dev/null
+++ b/application/forms/Config/UserBackend/DbBackendForm.php
@@ -0,0 +1,82 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\UserBackend;
+
+use Icinga\Web\Form;
+
+/**
+ * Form class for adding/modifying database user backends
+ */
+class DbBackendForm extends Form
+{
+    /**
+     * The database resource names the user can choose from
+     *
+     * @var array
+     */
+    protected $resources;
+
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_authbackend_db');
+    }
+
+    /**
+     * Set the resource names the user can choose from
+     *
+     * @param   array   $resources      The resources to choose from
+     *
+     * @return  $this
+     */
+    public function setResources(array $resources)
+    {
+        $this->resources = $resources;
+        return $this;
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * @param   array   $formData
+     */
+    public function createElements(array $formData)
+    {
+        $this->addElement(
+            'text',
+            'name',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Backend Name'),
+                'description'   => $this->translate(
+                    'The name of this authentication provider that is used to differentiate it from others'
+                )
+            )
+        );
+        $this->addElement(
+            'select',
+            'resource',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Database Connection'),
+                'description'   => $this->translate(
+                    'The database connection to use for authenticating with this provider'
+                ),
+                'multiOptions'  => !empty($this->resources)
+                    ? array_combine($this->resources, $this->resources)
+                    : array()
+            )
+        );
+        $this->addElement(
+            'hidden',
+            'backend',
+            array(
+                'disabled'  => true,
+                'value'     => 'db'
+            )
+        );
+    }
+}
diff --git a/application/forms/Config/UserBackend/ExternalBackendForm.php b/application/forms/Config/UserBackend/ExternalBackendForm.php
new file mode 100644
index 0000000..f4a4639
--- /dev/null
+++ b/application/forms/Config/UserBackend/ExternalBackendForm.php
@@ -0,0 +1,83 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\UserBackend;
+
+use Zend_Validate_Callback;
+use Icinga\Web\Form;
+
+/**
+ * Form class for adding/modifying user backends of type "external"
+ */
+class ExternalBackendForm extends Form
+{
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_authbackend_external');
+    }
+
+    /**
+     * @see Form::createElements()
+     */
+    public function createElements(array $formData)
+    {
+        $this->addElement(
+            'text',
+            'name',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Backend Name'),
+                'description'   => $this->translate(
+                    'The name of this authentication provider that is used to differentiate it from others'
+                )
+            )
+        );
+        $callbackValidator = new Zend_Validate_Callback(function ($value) {
+            return @preg_match($value, '') !== false;
+        });
+        $callbackValidator->setMessage(
+            $this->translate('"%value%" is not a valid regular expression.'),
+            Zend_Validate_Callback::INVALID_VALUE
+        );
+        $this->addElement(
+            'text',
+            'strip_username_regexp',
+            array(
+                'label'         => $this->translate('Filter Pattern'),
+                'description'   => $this->translate(
+                    'The filter to use to strip specific parts off from usernames.'
+                    . ' Leave empty if you do not want to strip off anything.'
+                ),
+                'requirement'   => $this->translate('The filter pattern must be a valid regular expression.'),
+                'validators'    => array($callbackValidator)
+            )
+        );
+        $this->addElement(
+            'hidden',
+            'backend',
+            array(
+                'disabled'  => true,
+                'value'     => 'external'
+            )
+        );
+
+        return $this;
+    }
+
+    /**
+     * Validate the configuration by creating a backend and requesting the user count
+     *
+     * Returns always true as backends of type "external" are just "passive" backends.
+     *
+     * @param   Form    $form   The form to fetch the configuration values from
+     *
+     * @return  bool            Whether validation succeeded or not
+     */
+    public static function isValidUserBackend(Form $form)
+    {
+        return true;
+    }
+}
diff --git a/application/forms/Config/UserBackend/LdapBackendForm.php b/application/forms/Config/UserBackend/LdapBackendForm.php
new file mode 100644
index 0000000..e7804cc
--- /dev/null
+++ b/application/forms/Config/UserBackend/LdapBackendForm.php
@@ -0,0 +1,414 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\UserBackend;
+
+use Exception;
+use Icinga\Data\ResourceFactory;
+use Icinga\Protocol\Ldap\LdapCapabilities;
+use Icinga\Protocol\Ldap\LdapConnection;
+use Icinga\Protocol\Ldap\LdapException;
+use Icinga\Web\Form;
+
+/**
+ * Form class for adding/modifying LDAP user backends
+ */
+class LdapBackendForm extends Form
+{
+    /**
+     * The ldap resource names the user can choose from
+     *
+     * @var array
+     */
+    protected $resources;
+
+    /**
+     * Default values for the form elements
+     *
+     * @var string[]
+     */
+    protected $suggestions = array();
+
+    /**
+     * Cache for {@link getLdapCapabilities()}
+     *
+     * @var LdapCapabilities
+     */
+    protected $ldapCapabilities;
+
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_authbackend_ldap');
+    }
+
+    /**
+     * Set the resource names the user can choose from
+     *
+     * @param   array   $resources      The resources to choose from
+     *
+     * @return  $this
+     */
+    public function setResources(array $resources)
+    {
+        $this->resources = $resources;
+        return $this;
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * @param   array   $formData
+     */
+    public function createElements(array $formData)
+    {
+        $isAd = isset($formData['type']) ? $formData['type'] === 'msldap' : false;
+
+        $this->addElement(
+            'text',
+            'name',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Backend Name'),
+                'description'   => $this->translate(
+                    'The name of this authentication provider that is used to differentiate it from others.'
+                ),
+                'value'         => $this->getSuggestion('name')
+            )
+        );
+        $this->addElement(
+            'select',
+            'resource',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('LDAP Connection'),
+                'description'   => $this->translate(
+                    'The LDAP connection to use for authenticating with this provider.'
+                ),
+                'multiOptions'  => !empty($this->resources)
+                    ? array_combine($this->resources, $this->resources)
+                    : array(),
+                'value'         => $this->getSuggestion('resource')
+            )
+        );
+
+        if (! $isAd && !empty($this->resources)) {
+            $this->addElement(
+                'button',
+                'discovery_btn',
+                array(
+                    'class'             => 'control-button',
+                    'type'              => 'submit',
+                    'value'             => 'discovery_btn',
+                    'label'             => $this->translate('Discover', 'A button to discover LDAP capabilities'),
+                    'title'             => $this->translate(
+                        'Push to fill in the chosen connection\'s default settings.'
+                    ),
+                    'decorators'        => array(
+                        array('ViewHelper', array('separator' => '')),
+                        array('Spinner'),
+                        array('HtmlTag', array('tag' => 'div', 'class' => 'control-group form-controls'))
+                    ),
+                    'formnovalidate'    => 'formnovalidate'
+                )
+            );
+        }
+
+        if ($isAd) {
+            // ActiveDirectory defaults
+            $userClass = 'user';
+            $filter = '!(objectClass=computer)';
+            $userNameAttribute = 'sAMAccountName';
+        } else {
+            // OpenLDAP defaults
+            $userClass = 'inetOrgPerson';
+            $filter = null;
+            $userNameAttribute = 'uid';
+        }
+
+        $this->addElement(
+            'text',
+            'user_class',
+            array(
+                'preserveDefault'   => true,
+                'required'          => ! $isAd,
+                'ignore'            => $isAd,
+                'disabled'          => $isAd ?: null,
+                'label'             => $this->translate('LDAP User Object Class'),
+                'description'       => $this->translate('The object class used for storing users on the LDAP server.'),
+                'value'             => $this->getSuggestion('user_class', $userClass)
+            )
+        );
+        $this->addElement(
+            'text',
+            'filter',
+            array(
+                'preserveDefault'   => true,
+                'allowEmpty'        => true,
+                'value'             => $this->getSuggestion('filter', $filter),
+                'label'             => $this->translate('LDAP Filter'),
+                'description'       => $this->translate(
+                    'An additional filter to use when looking up users using the specified connection. '
+                    . 'Leave empty to not to use any additional filter rules.'
+                ),
+                'requirement'       => $this->translate(
+                    'The filter needs to be expressed as standard LDAP expression.'
+                    . ' (e.g. &(foo=bar)(bar=foo) or foo=bar)'
+                ),
+                'validators'        => array(
+                    array(
+                        'Callback',
+                        false,
+                        array(
+                            'callback'  => function ($v) {
+                                // This is not meant to be a full syntax check. It will just
+                                // ensure that we can safely strip unnecessary parentheses.
+                                $v = trim($v);
+                                return ! $v || $v[0] !== '(' || (
+                                    strpos($v, ')(') !== false ? substr($v, -2) === '))' : substr($v, -1) === ')'
+                                );
+                            },
+                            'messages'  => array(
+                                'callbackValue' => $this->translate('The filter is invalid. Please check your syntax.')
+                            )
+                        )
+                    )
+                )
+            )
+        );
+        $this->addElement(
+            'text',
+            'user_name_attribute',
+            array(
+                'preserveDefault'   => true,
+                'required'          => ! $isAd,
+                'ignore'            => $isAd,
+                'disabled'          => $isAd ?: null,
+                'label'             => $this->translate('LDAP User Name Attribute'),
+                'description'       => $this->translate(
+                    'The attribute name used for storing the user name on the LDAP server.'
+                ),
+                'value'             => $this->getSuggestion('user_name_attribute', $userNameAttribute)
+            )
+        );
+        $this->addElement(
+            'hidden',
+            'backend',
+            array(
+                'disabled'  => true,
+                'value'     => $this->getSuggestion('backend', $isAd ? 'msldap' : 'ldap')
+            )
+        );
+        $this->addElement(
+            'text',
+            'base_dn',
+            array(
+                'preserveDefault'   => true,
+                'required'          => false,
+                'label'             => $this->translate('LDAP Base DN'),
+                'description'       => $this->translate(
+                    'The path where users can be found on the LDAP server. Leave ' .
+                    'empty to select all users available using the specified connection.'
+                ),
+                'value'             => $this->getSuggestion('base_dn')
+            )
+        );
+
+        $this->addElement(
+            'text',
+            'domain',
+            array(
+                'label'         => $this->translate('Domain'),
+                'description'   => $this->translate(
+                    'The domain the LDAP server is responsible for upon authentication.'
+                    . ' Note that if you specify a domain here,'
+                    . ' the LDAP backend only authenticates users who specify a domain upon login.'
+                    . ' If the domain of the user matches the domain configured here, this backend is responsible for'
+                    . ' authenticating the user based on the username without the domain part.'
+                    . ' If your LDAP backend holds usernames with a domain part or if it is not necessary in your setup'
+                    . ' to authenticate users based on their domains, leave this field empty.'
+                ),
+                'preserveDefault' => true,
+                'value'         => $this->getSuggestion('domain')
+            )
+        );
+
+        $this->addElement(
+            'button',
+            'btn_discover_domain',
+            array(
+                'class'             => 'control-button',
+                'type'              => 'submit',
+                'value'             => 'discovery_btn',
+                'label'             => $this->translate('Discover the domain'),
+                'title'             => $this->translate(
+                    'Push to disover and fill in the domain of the LDAP server.'
+                ),
+                'decorators'        => array(
+                    array('ViewHelper', array('separator' => '')),
+                    array('Spinner'),
+                    array('HtmlTag', array('tag' => 'div', 'class' => 'control-group form-controls'))
+                ),
+                'formnovalidate'    => 'formnovalidate'
+            )
+        );
+    }
+
+    public function isValidPartial(array $formData)
+    {
+        $isAd = isset($formData['type']) && $formData['type'] === 'msldap';
+        $baseDn = null;
+        $hasAdOid = false;
+        $discoverySuccessful = false;
+
+        if (! $isAd && ! empty($this->resources) && isset($formData['discovery_btn'])
+            && $formData['discovery_btn'] === 'discovery_btn') {
+            $discoverySuccessful = true;
+            try {
+                $capabilities = $this->getLdapCapabilities($formData);
+                $baseDn = $capabilities->getDefaultNamingContext();
+                $hasAdOid = $capabilities->isActiveDirectory();
+            } catch (Exception $e) {
+                $this->warning(sprintf(
+                    $this->translate('Failed to discover the chosen LDAP connection: %s'),
+                    $e->getMessage()
+                ));
+                $discoverySuccessful = false;
+            }
+        }
+
+        if ($discoverySuccessful) {
+            if ($isAd || $hasAdOid) {
+                // ActiveDirectory defaults
+                $userClass = 'user';
+                $filter = '!(objectClass=computer)';
+                $userNameAttribute = 'sAMAccountName';
+            } else {
+                // OpenLDAP defaults
+                $userClass = 'inetOrgPerson';
+                $filter = null;
+                $userNameAttribute = 'uid';
+            }
+
+            $formData['user_class'] = $userClass;
+
+            if (! isset($formData['filter']) || $formData['filter'] === '') {
+                $formData['filter'] = $filter;
+            }
+
+            $formData['user_name_attribute'] = $userNameAttribute;
+
+            if ($baseDn !== null && (! isset($formData['base_dn']) || $formData['base_dn'] === '')) {
+                $formData['base_dn'] = $baseDn;
+            }
+        }
+
+        if (isset($formData['btn_discover_domain']) && $formData['btn_discover_domain'] === 'discovery_btn') {
+            try {
+                $formData['domain'] = $this->discoverDomain($formData);
+            } catch (LdapException $e) {
+                $this->error($e->getMessage());
+            }
+        }
+
+        return parent::isValidPartial($formData);
+    }
+
+    /**
+     * Get the LDAP capabilities of either the resource specified by the user or the default one
+     *
+     * @param   string[]    $formData
+     *
+     * @return  LdapCapabilities
+     */
+    protected function getLdapCapabilities(array $formData)
+    {
+        if ($this->ldapCapabilities === null) {
+            $this->ldapCapabilities = ResourceFactory::create(
+                isset($formData['resource']) ? $formData['resource'] : reset($this->resources)
+            )->bind()->getCapabilities();
+        }
+
+        return $this->ldapCapabilities;
+    }
+
+    /**
+     * Discover the domain the LDAP server is responsible for
+     *
+     * @param   string[]    $formData
+     *
+     * @return  string
+     */
+    protected function discoverDomain(array $formData)
+    {
+        $cap = $this->getLdapCapabilities($formData);
+
+        if ($cap->isActiveDirectory()) {
+            $netBiosName = $cap->getNetBiosName();
+            if ($netBiosName !== null) {
+                return $netBiosName;
+            }
+        }
+
+        return $this->defaultNamingContextToFQDN($cap);
+    }
+
+    /**
+     * Get the default naming context as FQDN
+     *
+     * @param   LdapCapabilities    $cap
+     *
+     * @return  string|null
+     */
+    protected function defaultNamingContextToFQDN(LdapCapabilities $cap)
+    {
+        $defaultNamingContext = $cap->getDefaultNamingContext();
+        if ($defaultNamingContext !== null) {
+            $validationMatches = array();
+            if (preg_match('/\bdc=[^,]+(?:,dc=[^,]+)*$/', strtolower($defaultNamingContext), $validationMatches)) {
+                $splitMatches = array();
+                preg_match_all('/dc=([^,]+)/', $validationMatches[0], $splitMatches);
+                return implode('.', $splitMatches[1]);
+            }
+        }
+    }
+
+    /**
+     * Get the default values for the form elements
+     *
+     * @return string[]
+     */
+    public function getSuggestions()
+    {
+        return $this->suggestions;
+    }
+
+    /**
+     * Get the default value for the given form element or the given default
+     *
+     * @param   string  $element
+     * @param   string  $default
+     *
+     * @return  string
+     */
+    public function getSuggestion($element, $default = null)
+    {
+        return isset($this->suggestions[$element]) ? $this->suggestions[$element] : $default;
+    }
+
+    /**
+     * Set the default values for the form elements
+     *
+     * @param string[] $suggestions
+     *
+     * @return $this
+     */
+    public function setSuggestions(array $suggestions)
+    {
+        $this->suggestions = $suggestions;
+
+        return $this;
+    }
+}
diff --git a/application/forms/Config/UserBackendConfigForm.php b/application/forms/Config/UserBackendConfigForm.php
new file mode 100644
index 0000000..fdca657
--- /dev/null
+++ b/application/forms/Config/UserBackendConfigForm.php
@@ -0,0 +1,482 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config;
+
+use InvalidArgumentException;
+use Icinga\Application\Config;
+use Icinga\Authentication\User\UserBackend;
+use Icinga\Exception\ConfigurationError;
+use Icinga\Exception\IcingaException;
+use Icinga\Exception\NotFoundError;
+use Icinga\Data\ConfigObject;
+use Icinga\Data\Inspectable;
+use Icinga\Data\Inspection;
+use Icinga\Forms\ConfigForm;
+use Icinga\Forms\Config\UserBackend\ExternalBackendForm;
+use Icinga\Forms\Config\UserBackend\DbBackendForm;
+use Icinga\Forms\Config\UserBackend\LdapBackendForm;
+use Icinga\Web\Form;
+
+/**
+ * Form for managing user backends
+ */
+class UserBackendConfigForm extends ConfigForm
+{
+    /**
+     * The available user backend resources split by type
+     *
+     * @var array
+     */
+    protected $resources;
+
+    /**
+     * The backend to load when displaying the form for the first time
+     *
+     * @var string
+     */
+    protected $backendToLoad;
+
+    /**
+     * The loaded custom backends list
+     *
+     * @var array
+     */
+    protected $customBackends;
+
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_authbackend');
+        $this->setSubmitLabel($this->translate('Save Changes'));
+        $this->setValidatePartial(true);
+        $this->customBackends = UserBackend::getCustomBackendConfigForms();
+    }
+
+    /**
+     * Set the resource configuration to use
+     *
+     * @param   Config  $resourceConfig     The resource configuration
+     *
+     * @return  $this
+     *
+     * @throws  ConfigurationError          In case there are no valid resources for authentication available
+     */
+    public function setResourceConfig(Config $resourceConfig)
+    {
+        $resources = array();
+        foreach ($resourceConfig as $name => $resource) {
+            if (in_array($resource->type, array('db', 'ldap'))) {
+                $resources[$resource->type][] = $name;
+            }
+        }
+
+        if (empty($resources)) {
+            $externalBackends = $this->config->toArray();
+            array_walk(
+                $externalBackends,
+                function (&$authBackendCfg) {
+                    if (! isset($authBackendCfg['backend']) || $authBackendCfg['backend'] !== 'external') {
+                        $authBackendCfg = null;
+                    }
+                }
+            );
+            if (count(array_filter($externalBackends)) > 0 && (
+                $this->backendToLoad === null || !isset($externalBackends[$this->backendToLoad])
+            )) {
+                throw new ConfigurationError($this->translate(
+                    'Could not find any valid user backend resources.'
+                    . ' Please configure a resource for authentication first.'
+                ));
+            }
+        }
+
+        $this->resources = $resources;
+        return $this;
+    }
+
+    /**
+     * Return a form object for the given backend type
+     *
+     * @param   string      $type           The backend type for which to return a form
+     *
+     * @return  Form
+     *
+     * @throws  InvalidArgumentException    In case the given backend type is invalid
+     */
+    public function getBackendForm($type)
+    {
+        switch ($type) {
+            case 'db':
+                $form = new DbBackendForm();
+                $form->setResources(isset($this->resources['db']) ? $this->resources['db'] : array());
+                break;
+            case 'ldap':
+            case 'msldap':
+                $form = new LdapBackendForm();
+                $form->setResources(isset($this->resources['ldap']) ? $this->resources['ldap'] : array());
+                break;
+            case 'external':
+                $form = new ExternalBackendForm();
+                break;
+            default:
+                if (isset($this->customBackends[$type])) {
+                    return new $this->customBackends[$type]();
+                }
+
+                throw new InvalidArgumentException(
+                    sprintf($this->translate('Invalid backend type "%s" provided'), $type)
+                );
+        }
+
+        return $form;
+    }
+
+    /**
+     * Populate the form with the given backend's config
+     *
+     * @param   string  $name
+     *
+     * @return  $this
+     *
+     * @throws  NotFoundError   In case no backend with the given name is found
+     */
+    public function load($name)
+    {
+        if (! $this->config->hasSection($name)) {
+            throw new NotFoundError('No user backend called "%s" found', $name);
+        }
+
+        $this->backendToLoad = $name;
+        return $this;
+    }
+
+    /**
+     * Add a new user backend
+     *
+     * The backend to add is identified by the array-key `name'.
+     *
+     * @param   array   $data
+     *
+     * @return  $this
+     *
+     * @throws  InvalidArgumentException    In case $data does not contain a backend name
+     * @throws  IcingaException             In case a backend with the same name already exists
+     */
+    public function add(array $data)
+    {
+        if (! isset($data['name'])) {
+            throw new InvalidArgumentException('Key \'name\' missing');
+        }
+
+        $backendName = $data['name'];
+        if ($this->config->hasSection($backendName)) {
+            throw new IcingaException(
+                $this->translate('A user backend with the name "%s" does already exist'),
+                $backendName
+            );
+        }
+
+        unset($data['name']);
+        $this->config->setSection($backendName, $data);
+        return $this;
+    }
+
+    /**
+     * Edit a user backend
+     *
+     * @param   string  $name
+     * @param   array   $data
+     *
+     * @return  $this
+     *
+     * @throws  NotFoundError   In case no backend with the given name is found
+     */
+    public function edit($name, array $data)
+    {
+        if (! $this->config->hasSection($name)) {
+            throw new NotFoundError('No user backend called "%s" found', $name);
+        }
+
+        $backendConfig = $this->config->getSection($name);
+        if (isset($data['name'])) {
+            if ($data['name'] !== $name) {
+                $this->config->removeSection($name);
+                $name = $data['name'];
+            }
+
+            unset($data['name']);
+        }
+
+        $backendConfig->merge($data);
+        $this->config->setSection($name, $backendConfig);
+        return $this;
+    }
+
+    /**
+     * Remove a user backend
+     *
+     * @param   string  $name
+     *
+     * @return  $this
+     */
+    public function delete($name)
+    {
+        $this->config->removeSection($name);
+        return $this;
+    }
+
+    /**
+     * Move the given user backend up or down in order
+     *
+     * @param   string      $name           The name of the backend to be moved
+     * @param   int         $position       The new (absolute) position of the backend
+     *
+     * @return  $this
+     *
+     * @throws  NotFoundError               In case no backend with the given name is found
+     */
+    public function move($name, $position)
+    {
+        if (! $this->config->hasSection($name)) {
+            throw new NotFoundError('No user backend called "%s" found', $name);
+        }
+
+        $backendOrder = $this->config->keys();
+        array_splice($backendOrder, array_search($name, $backendOrder), 1);
+        array_splice($backendOrder, $position, 0, $name);
+
+        $newConfig = array();
+        foreach ($backendOrder as $backendName) {
+            $newConfig[$backendName] = $this->config->getSection($backendName);
+        }
+
+        $config = Config::fromArray($newConfig);
+        $this->config = $config->setConfigFile($this->config->getConfigFile());
+        return $this;
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * @param   array   $formData
+     */
+    public function createElements(array $formData)
+    {
+        $backendTypes = array();
+        $backendType = isset($formData['type']) ? $formData['type'] : null;
+
+        if (isset($this->resources['db'])) {
+            $backendTypes['db'] = $this->translate('Database');
+        }
+        if (isset($this->resources['ldap'])) {
+            $backendTypes['ldap'] = 'LDAP';
+            $backendTypes['msldap'] = 'ActiveDirectory';
+        }
+
+        $externalBackends = array_filter(
+            $this->config->toArray(),
+            function ($authBackendCfg) {
+                return isset($authBackendCfg['backend']) && $authBackendCfg['backend'] === 'external';
+            }
+        );
+        if ($backendType === 'external' || empty($externalBackends)) {
+            $backendTypes['external'] = $this->translate('External');
+        }
+
+        $customBackendTypes = array_keys($this->customBackends);
+        $backendTypes += array_combine($customBackendTypes, $customBackendTypes);
+
+        if ($backendType === null) {
+            $backendType = key($backendTypes);
+        }
+
+        $this->addElement(
+            'select',
+            'type',
+            array(
+                'ignore'            => true,
+                'required'          => true,
+                'autosubmit'        => true,
+                'label'             => $this->translate('Backend Type'),
+                'description'       => $this->translate(
+                    'The type of the resource to use for this authenticaton provider'
+                ),
+                'multiOptions'      => $backendTypes
+            )
+        );
+
+        if (isset($formData['skip_validation']) && $formData['skip_validation']) {
+            // In case another error occured and the checkbox was displayed before
+            $this->addSkipValidationCheckbox();
+        }
+
+        $this->addSubForm($this->getBackendForm($backendType)->create($formData), 'backend_form');
+    }
+
+    /**
+     * Populate the configuration of the backend to load
+     */
+    public function onRequest()
+    {
+        if ($this->backendToLoad) {
+            $data = $this->config->getSection($this->backendToLoad)->toArray();
+            $data['name'] = $this->backendToLoad;
+            $data['type'] = $data['backend'];
+            $this->populate($data);
+        }
+    }
+
+    /**
+     * Return whether the given values are valid
+     *
+     * @param   array   $formData   The data to validate
+     *
+     * @return  bool
+     */
+    public function isValid($formData)
+    {
+        if (! parent::isValid($formData)) {
+            return false;
+        }
+
+        if (($el = $this->getElement('skip_validation')) === null || false === $el->isChecked()) {
+            $inspection = static::inspectUserBackend($this);
+            if ($inspection && $inspection->hasError()) {
+                $this->error($inspection->getError());
+                if ($el === null) {
+                    $this->addSkipValidationCheckbox();
+                }
+
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Create a user backend by using the given form's values and return its inspection results
+     *
+     * Returns null for non-inspectable backends.
+     *
+     * @param   Form    $form
+     *
+     * @return  Inspection|null
+     */
+    public static function inspectUserBackend(Form $form)
+    {
+        $backend = UserBackend::create(null, new ConfigObject($form->getValues()));
+        if ($backend instanceof Inspectable) {
+            return $backend->inspect();
+        }
+    }
+
+    /**
+     * Add a checkbox to the form by which the user can skip the connection validation
+     */
+    protected function addSkipValidationCheckbox()
+    {
+        $this->addElement(
+            'checkbox',
+            'skip_validation',
+            array(
+                'order'         => 0,
+                'ignore'        => true,
+                'label'         => $this->translate('Skip Validation'),
+                'description'   => $this->translate(
+                    'Check this box to enforce changes without validating that authentication is possible.'
+                )
+            )
+        );
+    }
+
+    /**
+     * Run the configured backend's inspection checks and show the result, if necessary
+     *
+     * This will only run any validation if the user pushed the 'backend_validation' button.
+     *
+     * @param   array   $formData
+     *
+     * @return  bool
+     */
+    public function isValidPartial(array $formData)
+    {
+        if (! parent::isValidPartial($formData)) {
+            return false;
+        }
+
+        if ($this->getElement('backend_validation')->isChecked() && parent::isValid($formData)) {
+            $inspection = static::inspectUserBackend($this);
+            if ($inspection !== null) {
+                $join = function ($e) use (&$join) {
+                    return is_array($e) ? join("\n", array_map($join, $e)) : $e;
+                };
+                $this->addElement(
+                    'note',
+                    'inspection_output',
+                    array(
+                        'order'         => 0,
+                        'value'         => '<strong>' . $this->translate('Validation Log') . "</strong>\n\n"
+                            . join("\n", array_map($join, $inspection->toArray())),
+                        'decorators'    => array(
+                            'ViewHelper',
+                            array('HtmlTag', array('tag' => 'pre', 'class' => 'log-output')),
+                        )
+                    )
+                );
+
+                if ($inspection->hasError()) {
+                    $this->warning(sprintf(
+                        $this->translate('Failed to successfully validate the configuration: %s'),
+                        $inspection->getError()
+                    ));
+                    return false;
+                }
+            }
+
+            $this->info($this->translate('The configuration has been successfully validated.'));
+        }
+
+        return true;
+    }
+
+    /**
+     * Add a submit button to this form and one to manually validate the configuration
+     *
+     * Calls parent::addSubmitButton() to add the submit button.
+     *
+     * @return  $this
+     */
+    public function addSubmitButton()
+    {
+        parent::addSubmitButton()
+            ->getElement('btn_submit')
+            ->setDecorators(array('ViewHelper'));
+
+        $this->addElement(
+            'submit',
+            'backend_validation',
+            array(
+                'ignore'                => true,
+                'label'                 => $this->translate('Validate Configuration'),
+                'data-progress-label'   => $this->translate('Validation In Progress'),
+                'decorators'            => array('ViewHelper')
+            )
+        );
+        $this->addDisplayGroup(
+            array('btn_submit', 'backend_validation'),
+            'submit_validation',
+            array(
+                'decorators' => array(
+                    'FormElements',
+                    array('HtmlTag', array('tag' => 'div', 'class' => 'control-group form-controls'))
+                )
+            )
+        );
+
+        return $this;
+    }
+}
diff --git a/application/forms/Config/UserBackendReorderForm.php b/application/forms/Config/UserBackendReorderForm.php
new file mode 100644
index 0000000..019c032
--- /dev/null
+++ b/application/forms/Config/UserBackendReorderForm.php
@@ -0,0 +1,86 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config;
+
+use Icinga\Application\Config;
+use Icinga\Forms\ConfigForm;
+use Icinga\Exception\NotFoundError;
+use Icinga\Web\Notification;
+
+class UserBackendReorderForm extends ConfigForm
+{
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_reorder_authbackend');
+        $this->setViewScript('form/reorder-authbackend.phtml');
+    }
+
+    /**
+     * Return the ordered backend names
+     *
+     * @return  array
+     */
+    public function getBackendOrder()
+    {
+        return $this->config->keys();
+    }
+
+    /**
+     * Return the ordered backend configuration
+     *
+     * @return Config
+     */
+    public function getConfig()
+    {
+        return $this->config;
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * @param   array   $formData
+     */
+    public function createElements(array $formData)
+    {
+        // This adds just a dummy element to be able to utilize Form::getValue as part of onSuccess()
+        $this->addElement('hidden', 'backend_newpos');
+    }
+
+    /**
+     * Update the user backend order and save the configuration
+     */
+    public function onSuccess()
+    {
+        $newPosData = $this->getValue('backend_newpos');
+        if ($newPosData) {
+            $configForm = $this->getConfigForm();
+            list($backendName, $position) = explode('|', $newPosData, 2);
+
+            try {
+                if ($configForm->move($backendName, $position)->save()) {
+                    Notification::success($this->translate('Authentication order updated'));
+                } else {
+                    return false;
+                }
+            } catch (NotFoundError $_) {
+                 Notification::error(sprintf($this->translate('User backend "%s" not found'), $backendName));
+            }
+        }
+    }
+
+    /**
+     * Return the config form for user backends
+     *
+     * @return  ConfigForm
+     */
+    protected function getConfigForm()
+    {
+        $form = new UserBackendConfigForm();
+        $form->setIniConfig($this->config);
+        return $form;
+    }
+}
diff --git a/application/forms/Config/UserGroup/AddMemberForm.php b/application/forms/Config/UserGroup/AddMemberForm.php
new file mode 100644
index 0000000..debb9b7
--- /dev/null
+++ b/application/forms/Config/UserGroup/AddMemberForm.php
@@ -0,0 +1,182 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\UserGroup;
+
+use Exception;
+use Icinga\Data\Extensible;
+use Icinga\Data\Filter\Filter;
+use Icinga\Data\Selectable;
+use Icinga\Exception\NotFoundError;
+use Icinga\Web\Form;
+use Icinga\Web\Notification;
+
+/**
+ * Form for adding one or more group members
+ */
+class AddMemberForm extends Form
+{
+    /**
+     * The data source to fetch users from
+     *
+     * @var Selectable
+     */
+    protected $ds;
+
+    /**
+     * The user group backend to use
+     *
+     * @var Extensible
+     */
+    protected $backend;
+
+    /**
+     * The group to add members for
+     *
+     * @var string
+     */
+    protected $groupName;
+
+    /**
+     * Set the data source to fetch users from
+     *
+     * @param   Selectable  $ds
+     *
+     * @return  $this
+     */
+    public function setDataSource(Selectable $ds)
+    {
+        $this->ds = $ds;
+        return $this;
+    }
+
+    /**
+     * Set the user group backend to use
+     *
+     * @param   Extensible  $backend
+     *
+     * @return  $this
+     */
+    public function setBackend(Extensible $backend)
+    {
+        $this->backend = $backend;
+        return $this;
+    }
+
+    /**
+     * Set the group to add members for
+     *
+     * @param   string  $groupName
+     *
+     * @return  $this
+     */
+    public function setGroupName($groupName)
+    {
+        $this->groupName = $groupName;
+        return $this;
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * @param   array   $formData   The data sent by the user
+     */
+    public function createElements(array $formData)
+    {
+        // TODO(jom): Fetching already existing members to prevent the user from mistakenly creating duplicate
+        // memberships (no matter whether the data source permits it or not, a member does never need to be
+        // added more than once) should be kept at backend level (GroupController::fetchUsers) but this does
+        // not work currently as our ldap protocol stuff is unable to handle our filter implementation..
+        $members = $this->backend
+            ->select()
+            ->from('group_membership', array('user_name'))
+            ->where('group_name', $this->groupName)
+            ->fetchColumn();
+        $filter = empty($members) ? Filter::matchAll() : Filter::not(Filter::where('user_name', $members));
+
+        $users = $this->ds->select()->from('user', array('user_name'))->applyFilter($filter)->fetchColumn();
+        if (! empty($users)) {
+            $this->addElement(
+                'multiselect',
+                'user_name',
+                array(
+                    'multiOptions'  => array_combine($users, $users),
+                    'label'         => $this->translate('Backend Users'),
+                    'description'   => $this->translate(
+                        'Select one or more users (fetched from your user backends) to add as group member'
+                    ),
+                    'class'         => 'grant-permissions'
+                )
+            );
+        }
+
+        $this->addElement(
+            'textarea',
+            'users',
+            array(
+                'required'      => empty($users),
+                'label'         => $this->translate('Users'),
+                'description'   => $this->translate(
+                    'Provide one or more usernames separated by comma to add as group member'
+                )
+            )
+        );
+
+        $this->setTitle(sprintf($this->translate('Add members for group %s'), $this->groupName));
+        $this->setSubmitLabel($this->translate('Add'));
+    }
+
+    /**
+     * Insert the members for the group
+     *
+     * @return  bool
+     */
+    public function onSuccess()
+    {
+        $userNames = $this->getValue('user_name') ?: array();
+        if (($users = $this->getValue('users'))) {
+            $userNames = array_merge($userNames, array_map('trim', explode(',', $users)));
+        }
+
+        if (empty($userNames)) {
+            $this->info($this->translate(
+                'Please provide at least one username, either by choosing one '
+                . 'in the list or by manually typing one in the text box below'
+            ));
+            return false;
+        }
+
+        $single = null;
+        foreach ($userNames as $userName) {
+            try {
+                $this->backend->insert(
+                    'group_membership',
+                    array(
+                        'group_name'    => $this->groupName,
+                        'user_name'     => $userName
+                    )
+                );
+            } catch (NotFoundError $e) {
+                throw $e; // Trigger 404, the group name is initially accessed as GET parameter
+            } catch (Exception $e) {
+                Notification::error(sprintf(
+                    $this->translate('Failed to add "%s" as group member for "%s"'),
+                    $userName,
+                    $this->groupName
+                ));
+                $this->error($e->getMessage());
+                return false;
+            }
+
+            $single = $single === null;
+        }
+
+        if ($single) {
+            Notification::success(sprintf($this->translate('Group member "%s" added successfully'), $userName));
+        } else {
+            Notification::success($this->translate('Group members added successfully'));
+        }
+
+        return true;
+    }
+}
diff --git a/application/forms/Config/UserGroup/DbUserGroupBackendForm.php b/application/forms/Config/UserGroup/DbUserGroupBackendForm.php
new file mode 100644
index 0000000..daea8de
--- /dev/null
+++ b/application/forms/Config/UserGroup/DbUserGroupBackendForm.php
@@ -0,0 +1,79 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\UserGroup;
+
+use Icinga\Data\ResourceFactory;
+use Icinga\Web\Form;
+
+/**
+ * Form for managing database user group backends
+ */
+class DbUserGroupBackendForm extends Form
+{
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_dbusergroupbackend');
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * @param   array   $formData
+     */
+    public function createElements(array $formData)
+    {
+        $this->addElement(
+            'text',
+            'name',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Backend Name'),
+                'description'   => $this->translate(
+                    'The name of this user group backend that is used to differentiate it from others'
+                )
+            )
+        );
+
+        $resourceNames = $this->getDatabaseResourceNames();
+        $this->addElement(
+            'select',
+            'resource',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Database Connection'),
+                'description'   => $this->translate('The database connection to use for this backend'),
+                'multiOptions'  => empty($resourceNames) ? array() : array_combine($resourceNames, $resourceNames)
+            )
+        );
+
+        $this->addElement(
+            'hidden',
+            'backend',
+            array(
+                'disabled'  => true, // Prevents the element from being submitted, see #7717
+                'value'     => 'db'
+            )
+        );
+    }
+
+    /**
+     * Return the names of all configured database resources
+     *
+     * @return  array
+     */
+    protected function getDatabaseResourceNames()
+    {
+        $names = array();
+        foreach (ResourceFactory::getResourceConfigs() as $name => $config) {
+            if (strtolower($config->type) === 'db') {
+                $names[] = $name;
+            }
+        }
+
+        return $names;
+    }
+}
diff --git a/application/forms/Config/UserGroup/LdapUserGroupBackendForm.php b/application/forms/Config/UserGroup/LdapUserGroupBackendForm.php
new file mode 100644
index 0000000..10c069a
--- /dev/null
+++ b/application/forms/Config/UserGroup/LdapUserGroupBackendForm.php
@@ -0,0 +1,370 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\UserGroup;
+
+use Icinga\Authentication\User\UserBackend;
+use Icinga\Authentication\UserGroup\LdapUserGroupBackend;
+use Icinga\Data\ConfigObject;
+use Icinga\Data\ResourceFactory;
+use Icinga\Protocol\Ldap\LdapConnection;
+use Icinga\Web\Form;
+use Icinga\Web\Notification;
+
+/**
+ * Form for managing LDAP user group backends
+ */
+class LdapUserGroupBackendForm extends Form
+{
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_ldapusergroupbackend');
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * @param   array   $formData
+     */
+    public function createElements(array $formData)
+    {
+        $this->addElement(
+            'text',
+            'name',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Backend Name'),
+                'description'   => $this->translate(
+                    'The name of this user group backend that is used to differentiate it from others'
+                )
+            )
+        );
+
+        $resourceNames = $this->getLdapResourceNames();
+        $this->addElement(
+            'select',
+            'resource',
+            array(
+                'required'      => true,
+                'autosubmit'    => true,
+                'label'         => $this->translate('LDAP Connection'),
+                'description'   => $this->translate('The LDAP connection to use for this backend.'),
+                'multiOptions'  => array_combine($resourceNames, $resourceNames)
+            )
+        );
+        $resource = ResourceFactory::create(
+            isset($formData['resource']) && in_array($formData['resource'], $resourceNames)
+                ? $formData['resource']
+                : $resourceNames[0]
+        );
+
+        $userBackendNames = $this->getLdapUserBackendNames($resource);
+        if (! empty($userBackendNames)) {
+            $userBackends = array_combine($userBackendNames, $userBackendNames);
+            $userBackends['none'] = $this->translate('None', 'usergroupbackend.ldap.user_backend');
+        } else {
+            $userBackends = array('none' => $this->translate('None', 'usergroupbackend.ldap.user_backend'));
+        }
+        $this->addElement(
+            'select',
+            'user_backend',
+            array(
+                'required'      => true,
+                'autosubmit'    => true,
+                'label'         => $this->translate('User Backend'),
+                'description'   => $this->translate('The user backend to link with this user group backend.'),
+                'multiOptions'  => $userBackends
+            )
+        );
+
+        $groupBackend = new LdapUserGroupBackend($resource);
+        if ($formData['type'] === 'ldap') {
+            $defaults = $groupBackend->getOpenLdapDefaults();
+            $groupConfigDisabled = $userConfigDisabled = null; // MUST BE null, do NOT change this to false!
+        } else { // $formData['type'] === 'msldap'
+            $defaults = $groupBackend->getActiveDirectoryDefaults();
+            $groupConfigDisabled = $userConfigDisabled = true;
+        }
+
+        if ($formData['type'] === 'msldap') {
+            $this->addElement(
+                'checkbox',
+                'nested_group_search',
+                array(
+                    'description'   => $this->translate(
+                        'Check this box for nested group search in Active Directory based on the user'
+                    ),
+                    'label'         => $this->translate('Nested Group Search')
+                )
+            );
+        } else {
+            // This is required to purge already present options
+            $this->addElement('hidden', 'nested_group_search', array('disabled' => true));
+        }
+
+        $this->createGroupConfigElements($defaults, $groupConfigDisabled);
+        if (count($userBackends) === 1 || (isset($formData['user_backend']) && $formData['user_backend'] === 'none')) {
+            $this->createUserConfigElements($defaults, $userConfigDisabled);
+        } else {
+            $this->createHiddenUserConfigElements();
+        }
+
+        $this->addElement(
+            'hidden',
+            'backend',
+            array(
+                'disabled'  => true, // Prevents the element from being submitted, see #7717
+                'value'     => $formData['type']
+            )
+        );
+    }
+
+    /**
+     * Create and add all elements to this form required for the group configuration
+     *
+     * @param   ConfigObject    $defaults
+     * @param   null|bool       $disabled
+     */
+    protected function createGroupConfigElements(ConfigObject $defaults, $disabled)
+    {
+        $this->addElement(
+            'text',
+            'group_class',
+            array(
+                'preserveDefault'   => true,
+                'ignore'            => $disabled,
+                'disabled'          => $disabled,
+                'label'             => $this->translate('LDAP Group Object Class'),
+                'description'       => $this->translate('The object class used for storing groups on the LDAP server.'),
+                'value'             => $defaults->group_class
+            )
+        );
+        $this->addElement(
+            'text',
+            'group_filter',
+            array(
+                'preserveDefault'   => true,
+                'allowEmpty'        => true,
+                'label'             => $this->translate('LDAP Group Filter'),
+                'description'       => $this->translate(
+                    'An additional filter to use when looking up groups using the specified connection. '
+                    . 'Leave empty to not to use any additional filter rules.'
+                ),
+                'requirement'       => $this->translate(
+                    'The filter needs to be expressed as standard LDAP expression, without'
+                    . ' outer parentheses. (e.g. &(foo=bar)(bar=foo) or foo=bar)'
+                ),
+                'validators'        => array(
+                    array(
+                        'Callback',
+                        false,
+                        array(
+                            'callback'  => function ($v) {
+                                return strpos($v, '(') !== 0;
+                            },
+                            'messages'  => array(
+                                'callbackValue' => $this->translate('The filter must not be wrapped in parantheses.')
+                            )
+                        )
+                    )
+                ),
+                'value'             => $defaults->group_filter
+            )
+        );
+        $this->addElement(
+            'text',
+            'group_name_attribute',
+            array(
+                'preserveDefault'   => true,
+                'ignore'            => $disabled,
+                'disabled'          => $disabled,
+                'label'             => $this->translate('LDAP Group Name Attribute'),
+                'description'       => $this->translate(
+                    'The attribute name used for storing a group\'s name on the LDAP server.'
+                ),
+                'value'             => $defaults->group_name_attribute
+            )
+        );
+        $this->addElement(
+            'text',
+            'group_member_attribute',
+            array(
+                'preserveDefault'   => true,
+                'ignore'            => $disabled,
+                'disabled'          => $disabled,
+                'label'             => $this->translate('LDAP Group Member Attribute'),
+                'description'       => $this->translate('The attribute name used for storing a group\'s members.'),
+                'value'             => $defaults->group_member_attribute
+            )
+        );
+        $this->addElement(
+            'text',
+            'base_dn',
+            array(
+                'preserveDefault'   => true,
+                'label'             => $this->translate('LDAP Group Base DN'),
+                'description'       => $this->translate(
+                    'The path where groups can be found on the LDAP server. Leave ' .
+                    'empty to select all users available using the specified connection.'
+                ),
+                'value'             => $defaults->base_dn
+            )
+        );
+    }
+
+    /**
+     * Create and add all elements to this form required for the user configuration
+     *
+     * @param   ConfigObject    $defaults
+     * @param   null|bool       $disabled
+     */
+    protected function createUserConfigElements(ConfigObject $defaults, $disabled)
+    {
+        $this->addElement(
+            'text',
+            'user_class',
+            array(
+                'preserveDefault'   => true,
+                'ignore'            => $disabled,
+                'disabled'          => $disabled,
+                'label'             => $this->translate('LDAP User Object Class'),
+                'description'       => $this->translate('The object class used for storing users on the LDAP server.'),
+                'value'             => $defaults->user_class
+            )
+        );
+        $this->addElement(
+            'text',
+            'user_filter',
+            array(
+                'preserveDefault'   => true,
+                'allowEmpty'        => true,
+                'label'             => $this->translate('LDAP User Filter'),
+                'description'       => $this->translate(
+                    'An additional filter to use when looking up users using the specified connection. '
+                    . 'Leave empty to not to use any additional filter rules.'
+                ),
+                'requirement'       => $this->translate(
+                    'The filter needs to be expressed as standard LDAP expression, without'
+                    . ' outer parentheses. (e.g. &(foo=bar)(bar=foo) or foo=bar)'
+                ),
+                'validators'        => array(
+                    array(
+                        'Callback',
+                        false,
+                        array(
+                            'callback'  => function ($v) {
+                                return strpos($v, '(') !== 0;
+                            },
+                            'messages'  => array(
+                                'callbackValue' => $this->translate('The filter must not be wrapped in parantheses.')
+                            )
+                        )
+                    )
+                ),
+                'value'             => $defaults->user_filter
+            )
+        );
+        $this->addElement(
+            'text',
+            'user_name_attribute',
+            array(
+                'preserveDefault'   => true,
+                'ignore'            => $disabled,
+                'disabled'          => $disabled,
+                'label'             => $this->translate('LDAP User Name Attribute'),
+                'description'       => $this->translate(
+                    'The attribute name used for storing a user\'s name on the LDAP server.'
+                ),
+                'value'             => $defaults->user_name_attribute
+            )
+        );
+        $this->addElement(
+            'text',
+            'user_base_dn',
+            array(
+                'preserveDefault'   => true,
+                'label'             => $this->translate('LDAP User Base DN'),
+                'description'       => $this->translate(
+                    'The path where users can be found on the LDAP server. Leave ' .
+                    'empty to select all users available using the specified connection.'
+                ),
+                'value'             => $defaults->user_base_dn
+            )
+        );
+        $this->addElement(
+            'text',
+            'domain',
+            array(
+                'label'         => $this->translate('Domain'),
+                'description'   => $this->translate(
+                    'The domain the LDAP server is responsible for.'
+                )
+            )
+        );
+    }
+
+    /**
+     * Create and add all elements for the user configuration as hidden inputs
+     *
+     * This is required to purge already present options when unlinking a group backend with a user backend.
+     */
+    protected function createHiddenUserConfigElements()
+    {
+        $this->addElement('hidden', 'user_class', array('disabled' => true));
+        $this->addElement('hidden', 'user_filter', array('disabled' => true));
+        $this->addElement('hidden', 'user_name_attribute', array('disabled' => true));
+        $this->addElement('hidden', 'user_base_dn', array('disabled' => true));
+        $this->addElement('hidden', 'domain', array('disabled' => true));
+    }
+
+    /**
+     * Return the names of all configured LDAP resources
+     *
+     * @return  array
+     */
+    protected function getLdapResourceNames()
+    {
+        $names = array();
+        foreach (ResourceFactory::getResourceConfigs() as $name => $config) {
+            if (in_array(strtolower($config->type), array('ldap', 'msldap'))) {
+                $names[] = $name;
+            }
+        }
+
+        if (empty($names)) {
+            Notification::error(
+                $this->translate('No LDAP resources available. Please configure an LDAP resource first.')
+            );
+            $this->getResponse()->redirectAndExit('config/createresource');
+        }
+
+        return $names;
+    }
+
+    /**
+     * Return the names of all configured LDAP user backends
+     *
+     * @param   LdapConnection  $resource
+     *
+     * @return  array
+     */
+    protected function getLdapUserBackendNames(LdapConnection $resource)
+    {
+        $names = array();
+        foreach (UserBackend::getBackendConfigs() as $name => $config) {
+            if (in_array(strtolower($config->backend), array('ldap', 'msldap'))) {
+                $backendResource = ResourceFactory::create($config->resource);
+                if ($backendResource->getHostname() === $resource->getHostname()
+                    && $backendResource->getPort() === $resource->getPort()
+                ) {
+                    $names[] = $name;
+                }
+            }
+        }
+
+        return $names;
+    }
+}
diff --git a/application/forms/Config/UserGroup/UserGroupBackendForm.php b/application/forms/Config/UserGroup/UserGroupBackendForm.php
new file mode 100644
index 0000000..9ee4032
--- /dev/null
+++ b/application/forms/Config/UserGroup/UserGroupBackendForm.php
@@ -0,0 +1,314 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\UserGroup;
+
+use Icinga\Authentication\UserGroup\UserGroupBackend;
+use Icinga\Data\ConfigObject;
+use Icinga\Data\Inspectable;
+use Icinga\Data\Inspection;
+use Icinga\Web\Form;
+use InvalidArgumentException;
+use Icinga\Exception\IcingaException;
+use Icinga\Exception\NotFoundError;
+use Icinga\Forms\ConfigForm;
+
+/**
+ * Form for managing user group backends
+ */
+class UserGroupBackendForm extends ConfigForm
+{
+    protected $validatePartial = true;
+
+    /**
+     * The backend to load when displaying the form for the first time
+     *
+     * @var string
+     */
+    protected $backendToLoad;
+
+    /**
+     * Known custom backends
+     *
+     * @var array
+     */
+    protected $customBackends;
+
+    /**
+     * Create a user group backend by using the given form's values and return its inspection results
+     *
+     * Returns null for non-inspectable backends.
+     *
+     * @param   Form    $form
+     *
+     * @return  Inspection|null
+     */
+    public static function inspectUserBackend(Form $form)
+    {
+        $backend = UserGroupBackend::create(null, new ConfigObject($form->getValues()));
+        if ($backend instanceof Inspectable) {
+            return $backend->inspect();
+        }
+    }
+
+    /**
+     * Initialize this form
+     */
+    public function init()
+    {
+        $this->setName('form_config_usergroupbackend');
+        $this->setSubmitLabel($this->translate('Save Changes'));
+        $this->customBackends = UserGroupBackend::getCustomBackendConfigForms();
+    }
+
+    /**
+     * Return a form object for the given backend type
+     *
+     * @param   string  $type               The backend type for which to return a form
+     *
+     * @return  Form
+     *
+     * @throws  InvalidArgumentException    In case the given backend type is invalid
+     */
+    public function getBackendForm($type)
+    {
+        switch ($type) {
+            case 'db':
+                return new DbUserGroupBackendForm();
+            case 'ldap':
+            case 'msldap':
+                return new LdapUserGroupBackendForm();
+            default:
+                if (isset($this->customBackends[$type])) {
+                    return new $this->customBackends[$type]();
+                }
+
+                throw new InvalidArgumentException(
+                    sprintf($this->translate('Invalid backend type "%s" provided'), $type)
+                );
+        }
+    }
+
+    /**
+     * Populate the form with the given backend's config
+     *
+     * @param   string  $name
+     *
+     * @return  $this
+     *
+     * @throws  NotFoundError   In case no backend with the given name is found
+     */
+    public function load($name)
+    {
+        if (! $this->config->hasSection($name)) {
+            throw new NotFoundError('No user group backend called "%s" found', $name);
+        }
+
+        $this->backendToLoad = $name;
+        return $this;
+    }
+
+    /**
+     * Add a new user group backend
+     *
+     * The backend to add is identified by the array-key `name'.
+     *
+     * @param   array   $data
+     *
+     * @return  $this
+     *
+     * @throws  InvalidArgumentException    In case $data does not contain a backend name
+     * @throws  IcingaException             In case a backend with the same name already exists
+     */
+    public function add(array $data)
+    {
+        if (! isset($data['name'])) {
+            throw new InvalidArgumentException('Key \'name\' missing');
+        }
+
+        $backendName = $data['name'];
+        if ($this->config->hasSection($backendName)) {
+            throw new IcingaException('A user group backend with the name "%s" does already exist', $backendName);
+        }
+
+        unset($data['name']);
+        $this->config->setSection($backendName, $data);
+        return $this;
+    }
+
+    /**
+     * Edit a user group backend
+     *
+     * @param   string  $name
+     * @param   array   $data
+     *
+     * @return  $this
+     *
+     * @throws  NotFoundError   In case no backend with the given name is found
+     */
+    public function edit($name, array $data)
+    {
+        if (! $this->config->hasSection($name)) {
+            throw new NotFoundError('No user group backend called "%s" found', $name);
+        }
+
+        $backendConfig = $this->config->getSection($name);
+        if (isset($data['name'])) {
+            if ($data['name'] !== $name) {
+                $this->config->removeSection($name);
+                $name = $data['name'];
+            }
+
+            unset($data['name']);
+        }
+
+        $this->config->setSection($name, $backendConfig->merge($data));
+        return $this;
+    }
+
+    /**
+     * Remove a user group backend
+     *
+     * @param   string  $name
+     *
+     * @return  $this
+     */
+    public function delete($name)
+    {
+        $this->config->removeSection($name);
+        return $this;
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * @param   array   $formData
+     */
+    public function createElements(array $formData)
+    {
+        $backendTypes = array(
+            'db'        => $this->translate('Database'),
+            'ldap'      => 'LDAP',
+            'msldap'    => 'ActiveDirectory'
+        );
+
+        $customBackendTypes = array_keys($this->customBackends);
+        $backendTypes += array_combine($customBackendTypes, $customBackendTypes);
+
+        $backendType = isset($formData['type']) ? $formData['type'] : null;
+        if ($backendType === null) {
+            $backendType = key($backendTypes);
+        }
+
+        $this->addElement(
+            'select',
+            'type',
+            array(
+                'ignore'            => true,
+                'required'          => true,
+                'autosubmit'        => true,
+                'label'             => $this->translate('Backend Type'),
+                'description'       => $this->translate('The type of this user group backend'),
+                'multiOptions'      => $backendTypes
+            )
+        );
+
+        $this->addSubForm($this->getBackendForm($backendType)->create($formData), 'backend_form');
+    }
+
+    /**
+     * Populate the configuration of the backend to load
+     */
+    public function onRequest()
+    {
+        if ($this->backendToLoad) {
+            $data = $this->config->getSection($this->backendToLoad)->toArray();
+            $data['type'] = $data['backend'];
+            $data['name'] = $this->backendToLoad;
+            $this->populate($data);
+        }
+    }
+
+    /**
+     * Run the configured backend's inspection checks and show the result, if necessary
+     *
+     * This will only run any validation if the user pushed the 'backend_validation' button.
+     *
+     * @param   array   $formData
+     *
+     * @return  bool
+     */
+    public function isValidPartial(array $formData)
+    {
+        if (isset($formData['backend_validation']) && parent::isValid($formData)) {
+            $inspection = static::inspectUserBackend($this);
+            if ($inspection !== null) {
+                $join = function ($e) use (&$join) {
+                    return is_array($e) ? join("\n", array_map($join, $e)) : $e;
+                };
+                $this->addElement(
+                    'note',
+                    'inspection_output',
+                    array(
+                        'order'         => 0,
+                        'value'         => '<strong>' . $this->translate('Validation Log') . "</strong>\n\n"
+                            . join("\n", array_map($join, $inspection->toArray())),
+                        'decorators'    => array(
+                            'ViewHelper',
+                            array('HtmlTag', array('tag' => 'pre', 'class' => 'log-output')),
+                        )
+                    )
+                );
+
+                if ($inspection->hasError()) {
+                    $this->warning(sprintf(
+                        $this->translate('Failed to successfully validate the configuration: %s'),
+                        $inspection->getError()
+                    ));
+                    return false;
+                }
+            }
+
+            $this->info($this->translate('The configuration has been successfully validated.'));
+        }
+
+        return true;
+    }
+
+    /**
+     * Add a submit button to this form and one to manually validate the configuration
+     *
+     * Calls parent::addSubmitButton() to add the submit button.
+     *
+     * @return  $this
+     */
+    public function addSubmitButton()
+    {
+        parent::addSubmitButton()
+            ->getElement('btn_submit')
+            ->setDecorators(array('ViewHelper'));
+
+        $this->addElement(
+            'submit',
+            'backend_validation',
+            array(
+                'ignore'                => true,
+                'label'                 => $this->translate('Validate Configuration'),
+                'data-progress-label'   => $this->translate('Validation In Progress'),
+                'decorators'            => array('ViewHelper')
+            )
+        );
+        $this->addDisplayGroup(
+            array('btn_submit', 'backend_validation'),
+            'submit_validation',
+            array(
+                'decorators' => array(
+                    'FormElements',
+                    array('HtmlTag', array('tag' => 'div', 'class' => 'control-group form-controls'))
+                )
+            )
+        );
+
+        return $this;
+    }
+}
diff --git a/application/forms/Config/UserGroup/UserGroupForm.php b/application/forms/Config/UserGroup/UserGroupForm.php
new file mode 100644
index 0000000..b944e97
--- /dev/null
+++ b/application/forms/Config/UserGroup/UserGroupForm.php
@@ -0,0 +1,158 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\UserGroup;
+
+use Icinga\Application\Hook\ConfigFormEventsHook;
+use Icinga\Data\Filter\Filter;
+use Icinga\Forms\RepositoryForm;
+use Icinga\Web\Notification;
+
+class UserGroupForm extends RepositoryForm
+{
+    /**
+     * Create and add elements to this form to insert or update a group
+     *
+     * @param   array   $formData   The data sent by the user
+     */
+    protected function createInsertElements(array $formData)
+    {
+        $this->addElement(
+            'text',
+            'group_name',
+            array(
+                'required'  => true,
+                'label'     => $this->translate('Group Name')
+            )
+        );
+
+        if ($this->shouldInsert()) {
+            $this->setTitle($this->translate('Add a new group'));
+            $this->setSubmitLabel($this->translate('Add'));
+        } else { // $this->shouldUpdate()
+            $this->setTitle(sprintf($this->translate('Edit group %s'), $this->getIdentifier()));
+            $this->setSubmitLabel($this->translate('Save'));
+        }
+    }
+
+    /**
+     * Update a group
+     *
+     * @return  bool
+     */
+    protected function onUpdateSuccess()
+    {
+        if (parent::onUpdateSuccess()) {
+            if (($newName = $this->getValue('group_name')) !== $this->getIdentifier()) {
+                $this->getRedirectUrl()->setParam('group', $newName);
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Create and add elements to this form to delete a group
+     *
+     * @param   array   $formData   The data sent by the user
+     */
+    protected function createDeleteElements(array $formData)
+    {
+        $this->setTitle(sprintf($this->translate('Remove group %s?'), $this->getIdentifier()));
+        $this->addDescription($this->translate(
+            'Note that all users that are currently a member of this group will'
+            . ' have their membership cleared automatically.'
+        ));
+        $this->setSubmitLabel($this->translate('Yes'));
+        $this->setAttrib('class', 'icinga-form icinga-controls');
+    }
+
+    /**
+     * Create and return a filter to use when updating or deleting a group
+     *
+     * @return  Filter
+     */
+    protected function createFilter()
+    {
+        return Filter::where('group_name', $this->getIdentifier());
+    }
+
+    /**
+     * Return a notification message to use when inserting a group
+     *
+     * @param   bool    $success    true or false, whether the operation was successful
+     *
+     * @return  string
+     */
+    protected function getInsertMessage($success)
+    {
+        if ($success) {
+            return $this->translate('Group added successfully');
+        } else {
+            return $this->translate('Failed to add group');
+        }
+    }
+
+    /**
+     * Return a notification message to use when updating a group
+     *
+     * @param   bool    $success    true or false, whether the operation was successful
+     *
+     * @return  string
+     */
+    protected function getUpdateMessage($success)
+    {
+        if ($success) {
+            return sprintf($this->translate('Group "%s" has been edited'), $this->getIdentifier());
+        } else {
+            return sprintf($this->translate('Failed to edit group "%s"'), $this->getIdentifier());
+        }
+    }
+
+    /**
+     * Return a notification message to use when deleting a group
+     *
+     * @param   bool    $success    true or false, whether the operation was successful
+     *
+     * @return  string
+     */
+    protected function getDeleteMessage($success)
+    {
+        if ($success) {
+            return sprintf($this->translate('Group "%s" has been removed'), $this->getIdentifier());
+        } else {
+            return sprintf($this->translate('Failed to remove group "%s"'), $this->getIdentifier());
+        }
+    }
+
+    public function isValid($formData)
+    {
+        $valid = parent::isValid($formData);
+
+        if ($valid && ConfigFormEventsHook::runIsValid($this) === false) {
+            foreach (ConfigFormEventsHook::getLastErrors() as $msg) {
+                $this->error($msg);
+            }
+
+            $valid = false;
+        }
+
+        return $valid;
+    }
+
+    public function onSuccess()
+    {
+        if (parent::onSuccess() === false) {
+            return false;
+        }
+
+        if (ConfigFormEventsHook::runOnSuccess($this) === false) {
+            Notification::error($this->translate(
+                'Configuration successfully stored. Though, one or more module hooks failed to run.'
+                . ' See logs for details'
+            ));
+        }
+    }
+}
diff --git a/application/forms/ConfigForm.php b/application/forms/ConfigForm.php
new file mode 100644
index 0000000..8b0c5f9
--- /dev/null
+++ b/application/forms/ConfigForm.php
@@ -0,0 +1,192 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms;
+
+use Exception;
+use Zend_Form_Decorator_Abstract;
+use Icinga\Application\Config;
+use Icinga\Application\Hook\ConfigFormEventsHook;
+use Icinga\Exception\ConfigurationError;
+use Icinga\Web\Form;
+use Icinga\Web\Notification;
+
+/**
+ * Form base-class providing standard functionality for configuration forms
+ */
+class ConfigForm extends Form
+{
+    /**
+     * The configuration to work with
+     *
+     * @var Config
+     */
+    protected $config;
+
+    /**
+     * {@inheritdoc}
+     *
+     * Values from subforms are directly added to the returned values array instead of being grouped by the subforms'
+     * names.
+     */
+    public function getValues($suppressArrayNotation = false)
+    {
+        $values = parent::getValues($suppressArrayNotation);
+        foreach (array_keys($this->_subForms) as $name) {
+            // Zend returns values from subforms grouped by their names, but we want them flat
+            $values = array_merge($values, $values[$name]);
+            unset($values[$name]);
+        }
+        return $values;
+    }
+
+    /**
+     * Set the configuration to use when populating the form or when saving the user's input
+     *
+     * @param   Config      $config     The configuration to use
+     *
+     * @return  $this
+     */
+    public function setIniConfig(Config $config)
+    {
+        $this->config = $config;
+        return $this;
+    }
+
+    public function isValid($formData)
+    {
+        $valid = parent::isValid($formData);
+
+        if ($valid && ConfigFormEventsHook::runIsValid($this) === false) {
+            foreach (ConfigFormEventsHook::getLastErrors() as $msg) {
+                $this->error($msg);
+            }
+
+            $valid = false;
+        }
+
+        return $valid;
+    }
+
+    public function onSuccess()
+    {
+        $sections = array();
+        foreach (static::transformEmptyValuesToNull($this->getValues()) as $sectionAndPropertyName => $value) {
+            list($section, $property) = explode('_', $sectionAndPropertyName, 2);
+            $sections[$section][$property] = $value;
+        }
+
+        foreach ($sections as $section => $config) {
+            if ($this->isEmptyConfig($config)) {
+                $this->config->removeSection($section);
+            } else {
+                $this->config->setSection($section, $config);
+            }
+        }
+
+        if ($this->save()) {
+            Notification::success($this->translate('New configuration has successfully been stored'));
+        } else {
+            return false;
+        }
+
+        if (ConfigFormEventsHook::runOnSuccess($this) === false) {
+            Notification::error($this->translate(
+                'Configuration successfully stored. Though, one or more module hooks failed to run.'
+                . ' See logs for details'
+            ));
+        }
+    }
+
+    public function onRequest()
+    {
+        $values = array();
+        foreach ($this->config as $section => $properties) {
+            foreach ($properties as $name => $value) {
+                $values[$section . '_' . $name] = $value;
+            }
+        }
+
+        $this->populate($values);
+    }
+
+    /**
+     * Persist the current configuration to disk
+     *
+     * If an error occurs the user is shown a view describing the issue and displaying the raw INI configuration.
+     *
+     * @return  bool                    Whether the configuration could be persisted
+     */
+    public function save()
+    {
+        try {
+            $this->writeConfig($this->config);
+        } catch (ConfigurationError $e) {
+            $this->addError($e->getMessage());
+
+            return false;
+        } catch (Exception $e) {
+            $this->addDecorator('ViewScript', array(
+                'viewModule'    => 'default',
+                'viewScript'    => 'showConfiguration.phtml',
+                'errorMessage'  => $e->getMessage(),
+                'configString'  => $this->config,
+                'filePath'      => $this->config->getConfigFile(),
+                'placement'     => Zend_Form_Decorator_Abstract::PREPEND
+            ));
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Write the configuration to disk
+     *
+     * @param   Config  $config
+     */
+    protected function writeConfig(Config $config)
+    {
+        $config->saveIni();
+    }
+
+    /**
+     * Get whether the given config is empty or has only empty values
+     *
+     * @param array|Config $config
+     *
+     * @return bool
+     */
+    protected function isEmptyConfig($config)
+    {
+        if ($config instanceof Config) {
+            $config = $config->toArray();
+        }
+
+        foreach ($config as $value) {
+            if ($value !== null) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Transform all empty values of the given array to null
+     *
+     * @param   array   $values
+     *
+     * @return  array
+     */
+    public static function transformEmptyValuesToNull(array $values)
+    {
+        array_walk($values, function (&$v) {
+            if ($v === '' || $v === false || $v === array()) {
+                $v = null;
+            }
+        });
+
+        return $values;
+    }
+}