diff --git a/lib/Kolab/CardDAV/LDAPResources.php b/lib/Kolab/CardDAV/LDAPResources.php
--- /dev/null
+++ b/lib/Kolab/CardDAV/LDAPResources.php
@@ -0,0 +1,67 @@
+<?php
+
+/**
+ * CardDAV Directory class providing read-only access
+ * to an LDAP-based resources address book.
+ */
+
+namespace Kolab\CardDAV;
+
+use \rcube;
+use \rcube_ldap;
+use \rcube_ldap_generic;
+use Sabre\DAV;
+use Sabre\DAVACL;
+use Sabre\CardDAV\Property;
+use Kolab\Utils\VObjectUtils;
+
+class LDAPResources extends LDAPDirectory
+{
+    const DIRECTORY_NAME = 'ldap-resources';
+
+    /**
+     * Default constructor
+     */
+    function __construct($config, $principalUri, $carddavBackend = null)
+    {
+        $this->config = $config;
+        $this->principalUri = $principalUri;
+
+        $this->addressBookInfo = array(
+            'id' => self::DIRECTORY_NAME,
+            'uri' => self::DIRECTORY_NAME,
+            '{DAV:}displayname' => $config['name'] ?: "LDAP Resources", 
+            '{urn:ietf:params:xml:ns:carddav}supported-address-data' => new Property\SupportedAddressData(),
+            'principaluri' => $principalUri,
+        );
+
+        // used for vcard serialization
+        $this->carddavBackend = $carddavBackend ?: new ContactsBackend();
+        $this->carddavBackend->ldap_resources = $this;
+
+        // initialize cache. We need a different address space from GAL
+        // so don't mix our caches
+        $rcube = rcube::get_instance();
+        if ($rcube->config->get('kolabdav_res_cache')) {
+            $this->cache = $rcube->get_cache_shared('kolabdav_res');
+
+            // expunge cache every now and then
+            if (rand(0,10) === 0) {
+                $this->cache->expunge();
+            }
+        }
+    }
+
+    /**
+     * Returns the name of the node.
+     *
+     * This is used to generate the url.
+     *
+     * @return string
+     */
+    function getName()
+    {
+        return self::DIRECTORY_NAME;
+    }
+
+}