add helper class accessible for encryption modules to ask for a list of users with access to a file, needed to apply the recovery key to all files

16 files changed, 290 insertions, 107 deletions

diff --git a/apps/encryption/appinfo/application.php b/apps/encryption/appinfo/application.php
index e8f10798bb4..372d49e5ef7 100644
--- a/apps/encryption/appinfo/application.php
+++ b/apps/encryption/appinfo/application.php
@@ -139,7 +139,9 @@ class Application extends \OCP\AppFramework\App {
 					$server->getSecureRandom(),
 					$c->query('KeyManager'),
 					$server->getConfig(),
-					$server->getEncryptionKeyStorage(\OCA\Encryption\Crypto\Encryption::ID));
+					$server->getEncryptionKeyStorage(\OCA\Encryption\Crypto\Encryption::ID),
+					$server->getEncryptionFilesHelper(),
+					new \OC\Files\View());
 			});
 
 			$container->registerService('RecoveryController', function (IAppContainer $c) {
diff --git a/apps/encryption/appinfo/routes.php b/apps/encryption/appinfo/routes.php
index 030e7617816..1a6cf18fbed 100644
--- a/apps/encryption/appinfo/routes.php
+++ b/apps/encryption/appinfo/routes.php
@@ -38,6 +38,11 @@ namespace OCA\Encryption\AppInfo;
 		'name' => 'Recovery#changeRecoveryPassword',
 		'url' => '/ajax/changeRecoveryPassword',
 		'verb' => 'POST'
+	],
+		[
+		'name' => 'Recovery#userSetRecovery',
+		'url' => '/ajax/userSetRecovery',
+		'verb' => 'POST'
 	]
 
 
diff --git a/apps/encryption/controller/recoverycontroller.php b/apps/encryption/controller/recoverycontroller.php
index e7bfd374903..d115feb8e39 100644
--- a/apps/encryption/controller/recoverycontroller.php
+++ b/apps/encryption/controller/recoverycontroller.php
@@ -61,61 +61,72 @@ class RecoveryController extends Controller {
 	public function adminRecovery($recoveryPassword, $confirmPassword, $adminEnableRecovery) {
 		// Check if both passwords are the same
 		if (empty($recoveryPassword)) {
-			$errorMessage = $this->l->t('Missing recovery key password');
+			$errorMessage = (string) $this->l->t('Missing recovery key password');
 			return new DataResponse(['data' => ['message' => $errorMessage]], 500);
 		}
 
 		if (empty($confirmPassword)) {
-			$errorMessage = $this->l->t('Please repeat the recovery key password');
+			$errorMessage = (string) $this->l->t('Please repeat the recovery key password');
 			return new DataResponse(['data' => ['message' => $errorMessage]], 500);
 		}
 
 		if ($recoveryPassword !== $confirmPassword) {
-			$errorMessage = $this->l->t('Repeated recovery key password does not match the provided recovery key password');
+			$errorMessage = (string) $this->l->t('Repeated recovery key password does not match the provided recovery key password');
 			return new DataResponse(['data' => ['message' => $errorMessage]], 500);
 		}
 
 		if (isset($adminEnableRecovery) && $adminEnableRecovery === '1') {
 			if ($this->recovery->enableAdminRecovery($recoveryPassword)) {
-				return new DataResponse(['status'	=>'success', 'data' => array('message' => $this->l->t('Recovery key successfully enabled'))]);
+				return new DataResponse(['status'	=>'success', 'data' => array('message' => (string) $this->l->t('Recovery key successfully enabled'))]);
 			}
-			return new DataResponse(['data' => array('message' => $this->l->t('Could not enable recovery key. Please check your recovery key password!'))]);
+			return new DataResponse(['data' => array('message' => (string) $this->l->t('Could not enable recovery key. Please check your recovery key password!'))]);
 		} elseif (isset($adminEnableRecovery) && $adminEnableRecovery === '0') {
 			if ($this->recovery->disableAdminRecovery($recoveryPassword)) {
-				return new DataResponse(['data' => array('message' => $this->l->t('Recovery key successfully disabled'))]);
+				return new DataResponse(['data' => array('message' => (string) $this->l->t('Recovery key successfully disabled'))]);
 			}
-			return new DataResponse(['data' => array('message' => $this->l->t('Could not disable recovery key. Please check your recovery key password!'))]);
+			return new DataResponse(['data' => array('message' => (string) $this->l->t('Could not disable recovery key. Please check your recovery key password!'))]);
 		}
 	}
 
 	public function changeRecoveryPassword($newPassword, $oldPassword, $confirmPassword) {
 		//check if both passwords are the same
 		if (empty($oldPassword)) {
-			$errorMessage = $this->l->t('Please provide the old recovery password');
+			$errorMessage = (string) $this->l->t('Please provide the old recovery password');
 			return new DataResponse(array('data' => array('message' => $errorMessage)));
 		}
 
 		if (empty($newPassword)) {
-			$errorMessage = $this->l->t('Please provide a new recovery password');
+			$errorMessage = (string) $this->l->t('Please provide a new recovery password');
 			return new DataResponse (array('data' => array('message' => $errorMessage)));
 		}
 
 		if (empty($confirmPassword)) {
-			$errorMessage = $this->l->t('Please repeat the new recovery password');
+			$errorMessage = (string) $this->l->t('Please repeat the new recovery password');
 			return new DataResponse(array('data' => array('message' => $errorMessage)));
 		}
 
 		if ($newPassword !== $confirmPassword) {
-			$errorMessage = $this->l->t('Repeated recovery key password does not match the provided recovery key password');
+			$errorMessage = (string) $this->l->t('Repeated recovery key password does not match the provided recovery key password');
 			return new DataResponse(array('data' => array('message' => $errorMessage)));
 		}
 
 		$result = $this->recovery->changeRecoveryKeyPassword($newPassword, $oldPassword);
 
 		if ($result) {
-			return new DataResponse(array('status' => 'success' ,'data' => array('message' => $this->l->t('Password successfully changed.'))));
+			return new DataResponse(
+				array(
+					'status' => 'success' ,
+					'data' => array(
+						'message' => (string) $this->l->t('Password successfully changed.'))
+					)
+				);
 		} else {
-			return new DataResponse(array('data' => array('message' => $this->l->t('Could not change the password. Maybe the old password was not correct.'))));
+			return new DataResponse(
+				array(
+					'data' => array
+						('message' => (string) $this->l->t('Could not change the password. Maybe the old password was not correct.'))
+					)
+				);
 		}
 	}
 
@@ -131,4 +142,28 @@ class RecoveryController extends Controller {
 		}
 	}
 
+	public function userSetRecovery($userEnableRecovery) {
+		if ($userEnableRecovery === '0' || $userEnableRecovery === '1') {
+
+			$result = $this->recovery->setRecoveryForUser($userEnableRecovery);
+
+			if ($result) {
+				return new DataResponse(
+					array(
+					'status' => 'success',
+					'data' => array(
+						'message' => (string) $this->l->t('Recovery Key enabled'))
+					)
+				);
+			} else {
+				return new DataResponse(
+					array(
+					'data' => array
+						('message' => (string) $this->l->t('Could not enable the recovery key, please try again or contact your administrator'))
+					)
+				);
+			}
+		}
+	}
+
 }
diff --git a/apps/encryption/js/settings-personal.js b/apps/encryption/js/settings-personal.js
index b798ba7e4e1..7f0f4c6c26d 100644
--- a/apps/encryption/js/settings-personal.js
+++ b/apps/encryption/js/settings-personal.js
@@ -29,7 +29,7 @@ $(document).ready(function(){
 			var recoveryStatus = $( this ).val();
 			OC.msg.startAction('#userEnableRecovery .msg', 'Updating recovery keys. This can take some time...');
 			$.post(
-				OC.filePath( 'files_encryption', 'ajax', 'userrecovery.php' )
+					OC.generateUrl('/apps/encryption/ajax/userSetRecovery')
 				, { userEnableRecovery: recoveryStatus }
 				,  function( data ) {
 					OC.msg.finishedAction('#userEnableRecovery .msg', data);
@@ -40,33 +40,6 @@ $(document).ready(function(){
 		}
 	);
 
-	$("#encryptAll").click(
-		function(){
-
-			// Hide feedback messages in case they're already visible
-			$('#encryptAllSuccess').hide();
-			$('#encryptAllError').hide();
-
-			var userPassword = $( '#userPassword' ).val();
-			var encryptAll = $( '#encryptAll' ).val();
-
-			$.post(
-				OC.filePath( 'files_encryption', 'ajax', 'encryptall.php' )
-				, { encryptAll: encryptAll, userPassword: userPassword }
-				,  function( data ) {
-					if ( data.status == "success" ) {
-						$('#encryptAllSuccess').show();
-					} else {
-						$('#encryptAllError').show();
-					}
-				}
-			);
-			// Ensure page is not reloaded on form submit
-			return false;
-		}
-
-	);
-
 	// update private key password
 
 	$('input:password[name="changePrivateKeyPassword"]').keyup(function(event) {
diff --git a/apps/encryption/lib/recovery.php b/apps/encryption/lib/recovery.php
index 0426c3746ed..701c0934c95 100644
--- a/apps/encryption/lib/recovery.php
+++ b/apps/encryption/lib/recovery.php
@@ -29,7 +29,8 @@ use OCP\IUser;
 use OCP\IUserSession;
 use OCP\PreConditionNotMetException;
 use OCP\Security\ISecureRandom;
-use OCP\Share;
+use OC\Files\View;
+use OCP\Encryption\IFile;
 
 class Recovery {
 
@@ -58,7 +59,17 @@ class Recovery {
 	 * @var IStorage
 	 */
 	private $keyStorage;
-
+	/**
+	 * @var View
+	 */
+	private $view;
+	/**
+	 * @var IFile
+	 */
+	private $file;
+	/**
+	 * @var string
+	 */
 	private $recoveryKeyId;
 
 	/**
@@ -68,19 +79,25 @@ class Recovery {
 	 * @param KeyManager $keyManager
 	 * @param IConfig $config
 	 * @param IStorage $keyStorage
+	 * @param IFile $file
+	 * @param View $view
 	 */
 	public function __construct(IUserSession $user,
 								Crypt $crypt,
 								ISecureRandom $random,
 								KeyManager $keyManager,
 								IConfig $config,
-								IStorage $keyStorage) {
+								IStorage $keyStorage,
+								IFile $file,
+								View $view) {
 		$this->user = $user && $user->isLoggedIn() ? $user->getUser() : false;
 		$this->crypt = $crypt;
 		$this->random = $random;
 		$this->keyManager = $keyManager;
 		$this->config = $config;
 		$this->keyStorage = $keyStorage;
+		$this->view = $view;
+		$this->file = $file;
 	}
 
 	/**
@@ -138,14 +155,6 @@ class Recovery {
 		return false;
 	}
 
-	public function addRecoveryKeys($keyId) {
-		// No idea new way to do this....
-	}
-
-	public function removeRecoveryKeys() {
-		// No idea new way to do this....
-	}
-
 	/**
 	 * @return bool
 	 */
@@ -159,17 +168,23 @@ class Recovery {
 	}
 
 	/**
-	 * @param $enabled
+	 * @param string $value
 	 * @return bool
 	 */
-	public function setRecoveryForUser($enabled) {
-		$value = $enabled ? '1' : '0';
+	public function setRecoveryForUser($value) {
 
 		try {
 			$this->config->setUserValue($this->user->getUID(),
 				'encryption',
 				'recoveryEnabled',
 				$value);
+
+			if ($value === '1') {
+				$this->addRecoveryKeys('/' . $this->user . '/files/');
+			} else {
+				$this->removeRecoveryKeys();
+			}
+
 			return true;
 		} catch (PreConditionNotMetException $e) {
 			return false;
@@ -177,6 +192,50 @@ class Recovery {
 	}
 
 	/**
+	 * add recovery key to all encrypted files
+	 */
+	private function addRecoveryKeys($path = '/') {
+		$dirContent = $this->view->getDirectoryContent($path);
+		foreach ($dirContent as $item) {
+			// get relative path from files_encryption/keyfiles/
+			$filePath = $item['path'];
+			if ($item['type'] === 'dir') {
+				$this->addRecoveryKeys($filePath . '/');
+			} else {
+				$fileKey = $this->keyManager->getFileKey($filePath, $this->user);
+				if (!empty($fileKey)) {
+					$accessList = $this->file->getAccessList($path);
+					$publicKeys = array();
+					foreach ($accessList['users'] as $uid) {
+						$publicKeys[$uid] = $this->keymanager->getPublicKey($uid);
+					}
+
+					$encryptedKeyfiles = $this->crypt->multiKeyEncrypt($fileKey, $publicKeys);
+					$this->keymanager->setAllFileKeys($path, $encryptedKeyfiles);
+				}
+			}
+		}
+	}
+
+	/**
+	 * remove recovery key to all encrypted files
+	 */
+	private function removeRecoveryKeys($path = '/') {
+		$dirContent = $this->view->getDirectoryContent($this->keyfilesPath . $path);
+		foreach ($dirContent as $item) {
+			// get relative path from files_encryption/keyfiles
+			$filePath = substr($item['path'], strlen('files_encryption/keyfiles'));
+			if ($item['type'] === 'dir') {
+				$this->removeRecoveryKeys($filePath . '/');
+			} else {
+				// remove '.key' extension from path e.g. 'file.txt.key' to 'file.txt'
+				$file = substr($filePath, 0, -4);
+				$this->view->unlink($this->shareKeysPath . '/' . $file . '.' . $this->recoveryKeyId . '.shareKey');
+			}
+		}
+	}
+
+	/**
 	 * @param $recoveryPassword
 	 */
 	public function recoverUsersFiles($recoveryPassword) {
diff --git a/apps/encryption/settings/settings-personal.php b/apps/encryption/settings/settings-personal.php
index a4173dbd40f..8caacbd19ca 100644
--- a/apps/encryption/settings/settings-personal.php
+++ b/apps/encryption/settings/settings-personal.php
@@ -29,7 +29,11 @@ $user = \OCP\User::getUser();
 $view = new \OC\Files\View('/');
 
 $util = new \OCA\Encryption\Util(
-	new \OC\Files\View(), $crypt, $keymanager, \OC::$server->getLogger(), \OC::$server->getUserSession(), \OC::$server->getConfig());
+	new \OC\Files\View(),
+	$crypt, $keymanager,
+	\OC::$server->getLogger(),
+	\OC::$server->getUserSession(),
+	\OC::$server->getConfig());
 
 $privateKeySet = $session->isPrivateKeySet();
 // did we tried to initialize the keys for this session?
diff --git a/apps/encryption/templates/settings-personal.php b/apps/encryption/templates/settings-personal.php
index cefd6f4ad5c..6b8821ca8a8 100644
--- a/apps/encryption/templates/settings-personal.php
+++ b/apps/encryption/templates/settings-personal.php
@@ -1,6 +1,8 @@
 <?php
 	/** @var array $_ */
 	/** @var OC_L10N $l */
+script('encryption', 'settings-personal');
+script('core', 'multiselect');
 ?>
 <form id="encryption" class="section">
 	<h2><?php p($l->t('ownCloud basic encryption module')); ?></h2>
diff --git a/lib/base.php b/lib/base.php
index a5ca08123ac..1d536464153 100644
--- a/lib/base.php
+++ b/lib/base.php
@@ -723,6 +723,7 @@ class OC {
 					\OC::$server->getConfig()),
 				\OC\Files\Filesystem::getMountManager(),
 				\OC::$server->getEncryptionManager(),
+				\OC::$server->getEncryptionFilesHelper(),
 				$uid
 			);
 			\OCP\Util::connectHook('OCP\Share', 'post_shared', $updater, 'postShared');
diff --git a/lib/private/encryption/file.php b/lib/private/encryption/file.php
new file mode 100644
index 00000000000..f231500fb02
--- /dev/null
+++ b/lib/private/encryption/file.php
@@ -0,0 +1,81 @@
+<?php
+
+/**
+ * ownCloud
+ *
+ * @copyright (C) 2015 ownCloud, Inc.
+ *
+ * @author Bjoern Schiessle <schiessle@owncloud.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OC\Encryption;
+
+use OC\Encryption\Util;
+
+class File implements \OCP\Encryption\IFile {
+
+	/** @var Util */
+	protected $util;
+
+	public function __construct(Util $util) {
+		$this->util = $util;
+	}
+
+
+	/**
+	 * get list of users with access to the file
+	 *
+	 * @param $path to the file
+	 * @return array
+	 */
+	public function getAccessList($path) {
+
+		// Make sure that a share key is generated for the owner too
+		list($owner, $ownerPath) = $this->util->getUidAndFilename($path);
+
+		// always add owner to the list of users with access to the file
+		$userIds = array($owner);
+
+		if (!$this->util->isFile($ownerPath)) {
+			return array('users' => $userIds, 'public' => false);
+		}
+
+		$ownerPath = substr($ownerPath, strlen('/files'));
+		$ownerPath = $this->util->stripPartialFileExtension($ownerPath);
+
+		// Find out who, if anyone, is sharing the file
+		$result = \OCP\Share::getUsersSharingFile($ownerPath, $owner);
+		$userIds = \array_merge($userIds, $result['users']);
+		$public = $result['public'] || $result['remote'];
+
+		// check if it is a group mount
+		if (\OCP\App::isEnabled("files_external")) {
+			$mounts = \OC_Mount_Config::getSystemMountPoints();
+			foreach ($mounts as $mount) {
+				if ($mount['mountpoint'] == substr($ownerPath, 1, strlen($mount['mountpoint']))) {
+					$mountedFor = $this->util->getUserWithAccessToMountPoint($mount['applicable']['users'], $mount['applicable']['groups']);
+					$userIds = array_merge($userIds, $mountedFor);
+				}
+			}
+		}
+
+		// Remove duplicate UIDs
+		$uniqueUserIds = array_unique($userIds);
+
+		return array('users' => $uniqueUserIds, 'public' => $public);
+	}
+
+}
\ No newline at end of file
diff --git a/lib/private/encryption/update.php b/lib/private/encryption/update.php
index 06dc330151e..21cedde6140 100644
--- a/lib/private/encryption/update.php
+++ b/lib/private/encryption/update.php
@@ -46,12 +46,16 @@ class Update {
 	/** @var string */
 	protected $uid;
 
+	/** @var \OC\Encryption\File */
+	protected $file;
+
 	/**
 	 *
 	 * @param \OC\Files\View $view
 	 * @param \OC\Encryption\Util $util
 	 * @param \OC\Files\Mount\Manager $mountManager
 	 * @param \OC\Encryption\Manager $encryptionManager
+	 * @param \OC\Encryption\File $file
 	 * @param string $uid
 	 */
 	public function __construct(
@@ -59,6 +63,7 @@ class Update {
 			Util $util,
 			Mount\Manager $mountManager,
 			Manager $encryptionManager,
+			File $file,
 			$uid
 		) {
 
@@ -66,6 +71,7 @@ class Update {
 		$this->util = $util;
 		$this->mountManager = $mountManager;
 		$this->encryptionManager = $encryptionManager;
+		$this->file = $file;
 		$this->uid = $uid;
 	}
 
@@ -103,7 +109,7 @@ class Update {
 			$encryptionModule = $this->encryptionManager->getDefaultEncryptionModule();
 
 			foreach ($allFiles as $path) {
-				$usersSharing = $this->util->getSharingUsersArray($path);
+				$usersSharing = $this->file->getAccessList($path);
 				$encryptionModule->update($absPath, $this->uid, $usersSharing);
 			}
 	}
diff --git a/lib/private/encryption/util.php b/lib/private/encryption/util.php
index 1308d27c924..734da741fdd 100644
--- a/lib/private/encryption/util.php
+++ b/lib/private/encryption/util.php
@@ -163,49 +163,6 @@ class Util {
 	}
 
 	/**
-	 * Find, sanitise and format users sharing a file
-	 * @note This wraps other methods into a portable bundle
-	 * @param string $path path relative to current users files folder
-	 * @return array
-	 */
-	public function getSharingUsersArray($path) {
-
-		// Make sure that a share key is generated for the owner too
-		list($owner, $ownerPath) = $this->getUidAndFilename($path);
-
-		// always add owner to the list of users with access to the file
-		$userIds = array($owner);
-
-		if (!$this->isFile($ownerPath)) {
-			return array('users' => $userIds, 'public' => false);
-		}
-
-		$ownerPath = substr($ownerPath, strlen('/files'));
-		$ownerPath = $this->stripPartialFileExtension($ownerPath);
-
-		// Find out who, if anyone, is sharing the file
-		$result = \OCP\Share::getUsersSharingFile($ownerPath, $owner);
-		$userIds = \array_merge($userIds, $result['users']);
-		$public = $result['public'] || $result['remote'];
-
-		// check if it is a group mount
-		if (\OCP\App::isEnabled("files_external")) {
-			$mounts = \OC_Mount_Config::getSystemMountPoints();
-			foreach ($mounts as $mount) {
-				if ($mount['mountpoint'] == substr($ownerPath, 1, strlen($mount['mountpoint']))) {
-					$mountedFor = $this->getUserWithAccessToMountPoint($mount['applicable']['users'], $mount['applicable']['groups']);
-					$userIds = array_merge($userIds, $mountedFor);
-				}
-			}
-		}
-
-		// Remove duplicate UIDs
-		$uniqueUserIds = array_unique($userIds);
-
-		return array('users' => $uniqueUserIds, 'public' => $public);
-	}
-
-	/**
 	 * go recursively through a dir and collect all files and sub files.
 	 *
 	 * @param string $dir relative to the users files folder
@@ -243,7 +200,7 @@ class Util {
 	 * @param string $path
 	 * @return boolean
 	 */
-	protected function isFile($path) {
+	public function isFile($path) {
 		if (substr($path, 0, strlen('/files/')) === '/files/') {
 			return true;
 		}
@@ -361,7 +318,7 @@ class Util {
 		}
 	}
 
-	protected function getUserWithAccessToMountPoint($users, $groups) {
+	public function getUserWithAccessToMountPoint($users, $groups) {
 		$result = array();
 		if (in_array('all', $users)) {
 			$result = \OCP\User::getUsers();
diff --git a/lib/private/files/stream/encryption.php b/lib/private/files/stream/encryption.php
index e3927edff2c..a96d573723c 100644
--- a/lib/private/files/stream/encryption.php
+++ b/lib/private/files/stream/encryption.php
@@ -31,6 +31,9 @@ class Encryption extends Wrapper {
 	/** @var \OC\Encryption\Util */
 	protected $util;
 
+	/** @var \OC\Encryption\File */
+	protected $file;
+
 	/** @var \OCP\Encryption\IEncryptionModule */
 	protected $encryptionModule;
 
@@ -97,6 +100,7 @@ class Encryption extends Wrapper {
 			'encryptionModule',
 			'header',
 			'uid',
+			'file',
 			'util',
 			'size',
 			'unencryptedSize',
@@ -117,6 +121,7 @@ class Encryption extends Wrapper {
 	 * @param \OC\Files\Storage\Storage $storage
 	 * @param \OC\Files\Storage\Wrapper\Encryption $encStorage
 	 * @param \OC\Encryption\Util $util
+	 * @param \OC\Encryption\File $file
 	 * @param string $mode
 	 * @param int $size
 	 * @param int $unencryptedSize
@@ -130,6 +135,7 @@ class Encryption extends Wrapper {
 								\OC\Files\Storage\Storage $storage,
 								\OC\Files\Storage\Wrapper\Encryption $encStorage,
 								\OC\Encryption\Util $util,
+								 \OC\Encryption\File $file,
 								$mode,
 								$size,
 								$unencryptedSize) {
@@ -144,6 +150,7 @@ class Encryption extends Wrapper {
 				'header' => $header,
 				'uid' => $uid,
 				'util' => $util,
+				'file' => $file,
 				'size' => $size,
 				'unencryptedSize' => $unencryptedSize,
 				'encryptionStorage' => $encStorage
@@ -229,7 +236,7 @@ class Encryption extends Wrapper {
 			$sharePath = dirname($path);
 		}
 
-		$accessList = $this->util->getSharingUsersArray($sharePath);
+		$accessList = $this->file->getAccessList($sharePath);
 		$this->newHeader = $this->encryptionModule->begin($this->fullPath, $this->uid, $this->header, $accessList);
 
 		return true;
diff --git a/lib/private/server.php b/lib/private/server.php
index a38096cf740..661aaf6786d 100644
--- a/lib/private/server.php
+++ b/lib/private/server.php
@@ -87,6 +87,11 @@ class Server extends SimpleContainer implements IServerContainer {
 			return new Encryption\Manager($c->getConfig());
 		});
 
+		$this->registerService('EncryptionFileHelper', function (Server $c) {
+			$util = new \OC\Encryption\Util(new \OC\Files\View(), $c->getUserManager(), $c->getConfig());
+			return new Encryption\File($util);
+		});
+
 		$this->registerService('EncryptionKeyStorageFactory', function ($c) {
 			return new Encryption\Keys\Factory();
 		});
@@ -408,6 +413,13 @@ class Server extends SimpleContainer implements IServerContainer {
 	}
 
 	/**
+	 * @return \OC\Encryption\File
+	 */
+	function getEncryptionFilesHelper() {
+		return $this->query('EncryptionFileHelper');
+	}
+
+	/**
 	 * @param string $encryptionModuleId encryption module ID
 	 *
 	 * @return \OCP\Encryption\Keys\IStorage
diff --git a/lib/public/encryption/ifile.php b/lib/public/encryption/ifile.php
new file mode 100644
index 00000000000..cb4faea0625
--- /dev/null
+++ b/lib/public/encryption/ifile.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * ownCloud
+ *
+ * @copyright (C) 2015 ownCloud, Inc.
+ *
+ * @author Bjoern Schiessle <schiessle@owncloud.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCP\Encryption;
+
+interface IFile {
+
+	/**
+	 * get list of users with access to the file
+	 *
+	 * @param $path to the file
+	 * @return array
+	 */
+	public function getAccessList($path);
+
+}
\ No newline at end of file
diff --git a/lib/public/encryption/imanager.php b/lib/public/encryption/imanager.php
index 9a12e401593..2691604ac37 100644
--- a/lib/public/encryption/imanager.php
+++ b/lib/public/encryption/imanager.php
@@ -22,9 +22,7 @@
  */
 
 namespace OCP\Encryption;
-//
-// TODO: move exceptions to OCP
-//
+
 use OC\Encryption\Exceptions\ModuleDoesNotExistsException;
 use OC\Encryption\Exceptions\ModuleAlreadyExistsException;
 
diff --git a/lib/public/iservercontainer.php b/lib/public/iservercontainer.php
index 9e36bc31bed..509e5894d47 100644
--- a/lib/public/iservercontainer.php
+++ b/lib/public/iservercontainer.php
@@ -184,6 +184,11 @@ interface IServerContainer {
 	function getEncryptionManager();
 
 	/**
+	 * @return \OC\Encryption\File
+	 */
+	function getEncryptionFilesHelper();
+
+	/**
 	 * @param string $encryptionModuleId encryption module ID
 	 *
 	 * @return \OCP\Encryption\Keys\IStorage