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-rw-r--r--lib/private/encryption/exceptions/encryptionheaderkeyexistsexception.php29
-rw-r--r--lib/private/encryption/exceptions/modulealreadyexistsexception.php28
-rw-r--r--lib/private/encryption/exceptions/moduledoesnotexistsexception.php28
-rw-r--r--lib/private/encryption/keys/factory.php52
-rw-r--r--lib/private/encryption/keys/storage.php320
-rw-r--r--lib/private/encryption/manager.php170
-rw-r--r--lib/private/encryption/update.php111
-rw-r--r--lib/private/encryption/util.php401
8 files changed, 1139 insertions, 0 deletions
diff --git a/lib/private/encryption/exceptions/encryptionheaderkeyexistsexception.php b/lib/private/encryption/exceptions/encryptionheaderkeyexistsexception.php
new file mode 100644
index 00000000000..d401f0323ba
--- /dev/null
+++ b/lib/private/encryption/exceptions/encryptionheaderkeyexistsexception.php
@@ -0,0 +1,29 @@
+<?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\Exceptions;
+
+
+class EncryptionHeaderKeyExistsException extends \Exception {
+
+} \ No newline at end of file
diff --git a/lib/private/encryption/exceptions/modulealreadyexistsexception.php b/lib/private/encryption/exceptions/modulealreadyexistsexception.php
new file mode 100644
index 00000000000..41fc0188e24
--- /dev/null
+++ b/lib/private/encryption/exceptions/modulealreadyexistsexception.php
@@ -0,0 +1,28 @@
+<?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\Exceptions;
+
+class ModuleAlreadyExistsException extends \Exception {
+
+}
diff --git a/lib/private/encryption/exceptions/moduledoesnotexistsexception.php b/lib/private/encryption/exceptions/moduledoesnotexistsexception.php
new file mode 100644
index 00000000000..5507bd03dab
--- /dev/null
+++ b/lib/private/encryption/exceptions/moduledoesnotexistsexception.php
@@ -0,0 +1,28 @@
+<?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\Exceptions;
+
+class ModuleDoesNotExistsException extends \Exception {
+
+}
diff --git a/lib/private/encryption/keys/factory.php b/lib/private/encryption/keys/factory.php
new file mode 100644
index 00000000000..a214b238615
--- /dev/null
+++ b/lib/private/encryption/keys/factory.php
@@ -0,0 +1,52 @@
+<?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\Keys;
+
+use OC\Encryption\Util;
+use OC\Files\View;
+use OC\User;
+
+/**
+ * Factory provides KeyStorage for different encryption modules
+ */
+class Factory {
+ /** @var array */
+ protected $instances = array();
+
+ /**
+ * get a KeyStorage instance
+ *
+ * @param string $encryptionModuleId
+ * @param View $view
+ * @param Util $util
+ * @return Storage
+ */
+ public function get($encryptionModuleId,View $view, Util $util) {
+ if (!isset($this->instances[$encryptionModuleId])) {
+ $this->instances[$encryptionModuleId] = new Storage($encryptionModuleId, $view, $util);
+ }
+ return $this->instances[$encryptionModuleId];
+ }
+
+}
diff --git a/lib/private/encryption/keys/storage.php b/lib/private/encryption/keys/storage.php
new file mode 100644
index 00000000000..041db2a2cb8
--- /dev/null
+++ b/lib/private/encryption/keys/storage.php
@@ -0,0 +1,320 @@
+<?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\Keys;
+
+use OC\Encryption\Util;
+use OC\Files\View;
+use OCA\Files_Encryption\Exception\EncryptionException;
+
+class Storage implements \OCP\Encryption\Keys\IStorage {
+
+ /** @var View */
+ private $view;
+
+ /** @var Util */
+ private $util;
+
+ // base dir where all the file related keys are stored
+ private $keys_base_dir;
+ private $encryption_base_dir;
+
+ private $keyCache = array();
+
+ /** @var string */
+ private $encryptionModuleId;
+
+ /**
+ * @param string $encryptionModuleId
+ * @param View $view
+ * @param Util $util
+ */
+ public function __construct($encryptionModuleId, View $view, Util $util) {
+ $this->view = $view;
+ $this->util = $util;
+ $this->encryptionModuleId = $encryptionModuleId;
+
+ $this->encryption_base_dir = '/files_encryption';
+ $this->keys_base_dir = $this->encryption_base_dir .'/keys';
+ }
+
+ /**
+ * get user specific key
+ *
+ * @param string $uid ID if the user for whom we want the key
+ * @param string $keyId id of the key
+ *
+ * @return mixed key
+ */
+ public function getUserKey($uid, $keyId) {
+ $path = $this->constructUserKeyPath($keyId, $uid);
+ return $this->getKey($path);
+ }
+
+ /**
+ * get file specific key
+ *
+ * @param string $path path to file
+ * @param string $keyId id of the key
+ *
+ * @return mixed key
+ */
+ public function getFileKey($path, $keyId) {
+ $keyDir = $this->getFileKeyDir($path);
+ return $this->getKey($keyDir . $keyId);
+ }
+
+ /**
+ * get system-wide encryption keys not related to a specific user,
+ * e.g something like a key for public link shares
+ *
+ * @param string $keyId id of the key
+ *
+ * @return mixed key
+ */
+ public function getSystemUserKey($keyId) {
+ $path = $this->constructUserKeyPath($keyId);
+ return $this->getKey($path);
+ }
+
+ /**
+ * set user specific key
+ *
+ * @param string $uid ID if the user for whom we want the key
+ * @param string $keyId id of the key
+ * @param mixed $key
+ */
+ public function setUserKey($uid, $keyId, $key) {
+ $path = $this->constructUserKeyPath($keyId, $uid);
+ return $this->setKey($path, $key);
+ }
+
+ /**
+ * set file specific key
+ *
+ * @param string $path path to file
+ * @param string $keyId id of the key
+ * @param boolean
+ */
+ public function setFileKey($path, $keyId, $key) {
+ $keyDir = $this->getFileKeyDir($path);
+ return $this->setKey($keyDir . $keyId, $key);
+ }
+
+ /**
+ * set system-wide encryption keys not related to a specific user,
+ * e.g something like a key for public link shares
+ *
+ * @param string $keyId id of the key
+ * @param mixed $key
+ *
+ * @return mixed key
+ */
+ public function setSystemUserKey($keyId, $key) {
+ $path = $this->constructUserKeyPath($keyId);
+ return $this->setKey($path, $key);
+ }
+
+ /**
+ * delete user specific key
+ *
+ * @param string $uid ID if the user for whom we want to delete the key
+ * @param string $keyId id of the key
+ *
+ * @return boolean
+ */
+ public function deleteUserKey($uid, $keyId) {
+ $path = $this->constructUserKeyPath($keyId, $uid);
+ return $this->view->unlink($path);
+ }
+
+ /**
+ * delete file specific key
+ *
+ * @param string $path path to file
+ * @param string $keyId id of the key
+ *
+ * @return boolean
+ */
+ public function deleteFileKey($path, $keyId) {
+ $keyDir = $this->getFileKeyDir($path);
+ return $this->view->unlink($keyDir . $keyId);
+ }
+
+ /**
+ * delete all file keys for a given file
+ *
+ * @param string $path to the file
+ * @return boolean
+ */
+ public function deleteAllFileKeys($path) {
+ $keyDir = $this->getFileKeyDir($path);
+ return $this->view->deleteAll(dirname($keyDir));
+ }
+
+ /**
+ * delete system-wide encryption keys not related to a specific user,
+ * e.g something like a key for public link shares
+ *
+ * @param string $keyId id of the key
+ *
+ * @return boolean
+ */
+ public function deleteSystemUserKey($keyId) {
+ $path = $this->constructUserKeyPath($keyId);
+ return $this->view->unlink($path);
+ }
+
+
+ /**
+ * construct path to users key
+ *
+ * @param string $keyId
+ * @param string $uid
+ * @return string
+ */
+ protected function constructUserKeyPath($keyId, $uid = null) {
+
+ if ($uid === null) {
+ $path = $this->encryption_base_dir . '/' . $this->encryptionModuleId . '/' . $keyId;
+ } else {
+ $path = '/' . $uid . $this->encryption_base_dir . '/'
+ . $this->encryptionModuleId . '/' . $uid . '.' . $keyId;
+ }
+
+ return $path;
+ }
+
+ /**
+ * read key from hard disk
+ *
+ * @param string $path to key
+ * @return string
+ */
+ private function getKey($path) {
+
+ $key = '';
+
+ if ($this->view->file_exists($path)) {
+ if (isset($this->keyCache[$path])) {
+ $key = $this->keyCache[$path];
+ } else {
+ $key = $this->view->file_get_contents($path);
+ $this->keyCache[$path] = $key;
+ }
+ }
+
+ return $key;
+ }
+
+ /**
+ * write key to disk
+ *
+ *
+ * @param string $path path to key directory
+ * @param string $key key
+ * @return bool
+ */
+ private function setKey($path, $key) {
+ $this->keySetPreparation(dirname($path));
+
+ $result = $this->view->file_put_contents($path, $key);
+
+ if (is_int($result) && $result > 0) {
+ $this->keyCache[$path] = $key;
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * get path to key folder for a given file
+ *
+ * @param string $path path to the file, relative to data/
+ * @return string
+ * @throws EncryptionException
+ * @internal param string $keyId
+ */
+ private function getFileKeyDir($path) {
+
+ if ($this->view->is_dir($path)) {
+ throw new EncryptionException('file was expected but directory was given', EncryptionException::GENERIC);
+ }
+
+ list($owner, $filename) = $this->util->getUidAndFilename($path);
+ $filename = $this->util->stripPartialFileExtension($filename);
+
+ // in case of system wide mount points the keys are stored directly in the data directory
+ if ($this->util->isSystemWideMountPoint($filename)) {
+ $keyPath = $this->keys_base_dir . $filename . '/';
+ } else {
+ $keyPath = '/' . $owner . $this->keys_base_dir . $filename . '/';
+ }
+
+ return \OC\Files\Filesystem::normalizePath($keyPath . $this->encryptionModuleId . '/', false);
+ }
+
+ /**
+ * move keys if a file was renamed
+ *
+ * @param string $source
+ * @param string $target
+ * @param string $owner
+ * @param bool $systemWide
+ */
+ public function renameKeys($source, $target, $owner, $systemWide) {
+ if ($systemWide) {
+ $sourcePath = $this->keys_base_dir . $source . '/';
+ $targetPath = $this->keys_base_dir . $target . '/';
+ } else {
+ $sourcePath = '/' . $owner . $this->keys_base_dir . $source . '/';
+ $targetPath = '/' . $owner . $this->keys_base_dir . $target . '/';
+ }
+
+ if ($this->view->file_exists($sourcePath)) {
+ $this->keySetPreparation(dirname($targetPath));
+ $this->view->rename($sourcePath, $targetPath);
+ }
+ }
+
+ /**
+ * Make preparations to filesystem for saving a keyfile
+ *
+ * @param string $path relative to the views root
+ */
+ protected function keySetPreparation($path) {
+ // If the file resides within a subdirectory, create it
+ if (!$this->view->file_exists($path)) {
+ $sub_dirs = explode('/', $path);
+ $dir = '';
+ foreach ($sub_dirs as $sub_dir) {
+ $dir .= '/' . $sub_dir;
+ if (!$this->view->is_dir($dir)) {
+ $this->view->mkdir($dir);
+ }
+ }
+ }
+ }
+
+}
diff --git a/lib/private/encryption/manager.php b/lib/private/encryption/manager.php
new file mode 100644
index 00000000000..5164025239c
--- /dev/null
+++ b/lib/private/encryption/manager.php
@@ -0,0 +1,170 @@
+<?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 OCP\Encryption\IEncryptionModule;
+
+class Manager implements \OCP\Encryption\IManager {
+
+ /** @var array */
+ protected $encryptionModules;
+
+ /** @var \OCP\IConfig */
+ protected $config;
+
+ /**
+ * @param \OCP\IConfig $config
+ */
+ public function __construct(\OCP\IConfig $config) {
+ $this->encryptionModules = array();
+ $this->config = $config;
+ }
+
+ /**
+ * Check if encryption is enabled
+ *
+ * @return bool true if enabled, false if not
+ */
+ public function isEnabled() {
+
+ $installed = $this->config->getSystemValue('installed', false);
+ if (!$installed) {
+ return false;
+ }
+
+ $enabled = $this->config->getAppValue('core', 'encryption_enabled', 'no');
+ return $enabled === 'yes';
+ }
+
+ /**
+ * Registers an encryption module
+ *
+ * @param IEncryptionModule $module
+ * @throws Exceptions\ModuleAlreadyExistsException
+ */
+ public function registerEncryptionModule(IEncryptionModule $module) {
+ $id = $module->getId();
+ $name = $module->getDisplayName();
+ if (isset($this->encryptionModules[$id])) {
+ $message = 'Id "' . $id . '" already used by encryption module "' . $name . '"';
+ throw new Exceptions\ModuleAlreadyExistsException($message);
+
+ }
+
+ $defaultEncryptionModuleId = $this->getDefaultEncryptionModuleId();
+
+ if (empty($defaultEncryptionModuleId)) {
+ $this->setDefaultEncryptionModule($id);
+ }
+
+ $this->encryptionModules[$id] = $module;
+ }
+
+ /**
+ * Unregisters an encryption module
+ *
+ * @param IEncryptionModule $module
+ */
+ public function unregisterEncryptionModule(IEncryptionModule $module) {
+ unset($this->encryptionModules[$module->getId()]);
+ }
+
+ /**
+ * get a list of all encryption modules
+ *
+ * @return IEncryptionModule[]
+ */
+ public function getEncryptionModules() {
+ return $this->encryptionModules;
+ }
+
+ /**
+ * get a specific encryption module
+ *
+ * @param string $moduleId
+ * @return IEncryptionModule
+ * @throws Exceptions\ModuleDoesNotExistsException
+ */
+ public function getEncryptionModule($moduleId) {
+ if (isset($this->encryptionModules[$moduleId])) {
+ return $this->encryptionModules[$moduleId];
+ } else {
+ $message = "Module with id: $moduleId does not exists.";
+ throw new Exceptions\ModuleDoesNotExistsException($message);
+ }
+ }
+
+ /**
+ * get default encryption module
+ *
+ * @return \OCP\Encryption\IEncryptionModule
+ * @throws Exceptions\ModuleDoesNotExistsException
+ */
+ public function getDefaultEncryptionModule() {
+ $defaultModuleId = $this->getDefaultEncryptionModuleId();
+ if (!empty($defaultModuleId)) {
+ if (isset($this->encryptionModules[$defaultModuleId])) {
+ return $this->encryptionModules[$defaultModuleId];
+ } else {
+ $message = 'Default encryption module not loaded';
+ throw new Exceptions\ModuleDoesNotExistsException($message);
+ }
+ } else {
+ $message = 'No default encryption module defined';
+ throw new Exceptions\ModuleDoesNotExistsException($message);
+ }
+
+ }
+
+ /**
+ * set default encryption module Id
+ *
+ * @param string $moduleId
+ * @return bool
+ */
+ public function setDefaultEncryptionModule($moduleId) {
+ try {
+ $this->config->setAppValue('core', 'default_encryption_module', $moduleId);
+ return true;
+ } catch (\Exception $e) {
+ return false;
+ }
+
+ }
+
+ /**
+ * get default encryption module Id
+ *
+ * @return string
+ */
+ protected function getDefaultEncryptionModuleId() {
+ try {
+ return $this->config->getAppValue('core', 'default_encryption_module');
+ } catch (\Exception $e) {
+ return '';
+ }
+ }
+
+
+}
diff --git a/lib/private/encryption/update.php b/lib/private/encryption/update.php
new file mode 100644
index 00000000000..649cf0285a6
--- /dev/null
+++ b/lib/private/encryption/update.php
@@ -0,0 +1,111 @@
+<?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\Files\Mount;
+use \OC\Files\View;
+
+/**
+ * update encrypted files, e.g. because a file was shared
+ */
+class Update {
+
+ /** @var \OC\Files\View */
+ protected $view;
+
+ /** @var \OC\Encryption\Util */
+ protected $util;
+
+ /** @var \OC\Files\Mount\Manager */
+ protected $mountManager;
+
+ /** @var \OC\Encryption\Manager */
+ protected $encryptionManager;
+
+ /** @var string */
+ protected $uid;
+
+ /**
+ *
+ * @param \OC\Files\View $view
+ * @param \OC\Encryption\Util $util
+ * @param \OC\Files\Mount\Manager $mountManager
+ * @param \OC\Encryption\Manager $encryptionManager
+ * @param string $uid
+ */
+ public function __construct(
+ View $view,
+ Util $util,
+ Mount\Manager $mountManager,
+ Manager $encryptionManager,
+ $uid
+ ) {
+
+ $this->view = $view;
+ $this->util = $util;
+ $this->mountManager = $mountManager;
+ $this->encryptionManager = $encryptionManager;
+ $this->uid = $uid;
+ }
+
+ public function postShared($params) {
+ if ($params['itemType'] === 'file' || $params['itemType'] === 'folder') {
+ $this->update($params['fileSource']);
+ }
+ }
+
+ public function postUnshared($params) {
+ if ($params['itemType'] === 'file' || $params['itemType'] === 'folder') {
+ $this->update($params['fileSource']);
+ }
+ }
+
+ /**
+ * update keyfiles and share keys recursively
+ *
+ * @param int $fileSource file source id
+ */
+ private function update($fileSource) {
+ $path = \OC\Files\Filesystem::getPath($fileSource);
+ $absPath = '/' . $this->uid . '/files' . $path;
+
+ $mount = $this->mountManager->find($path);
+ $mountPoint = $mount->getMountPoint();
+
+ // if a folder was shared, get a list of all (sub-)folders
+ if ($this->view->is_dir($absPath)) {
+ $allFiles = $this->util->getAllFiles($absPath, $mountPoint);
+ } else {
+ $allFiles = array($absPath);
+ }
+
+ $encryptionModule = $this->encryptionManager->getDefaultEncryptionModule();
+
+ foreach ($allFiles as $path) {
+ $usersSharing = $this->util->getSharingUsersArray($path);
+ $encryptionModule->update($absPath, $usersSharing);
+ }
+ }
+
+} \ No newline at end of file
diff --git a/lib/private/encryption/util.php b/lib/private/encryption/util.php
new file mode 100644
index 00000000000..2c6ff266841
--- /dev/null
+++ b/lib/private/encryption/util.php
@@ -0,0 +1,401 @@
+<?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\Exceptions\EncryptionHeaderToLargeException;
+use OC\Encryption\Exceptions\EncryptionHeaderKeyExistsException;
+use OCP\Encryption\IEncryptionModule;
+
+class Util {
+
+ const HEADER_START = 'HBEGIN';
+ const HEADER_END = 'HEND';
+ const HEADER_PADDING_CHAR = '-';
+
+ const HEADER_ENCRYPTION_MODULE_KEY = 'oc_encryption_module';
+
+ /**
+ * block size will always be 8192 for a PHP stream
+ * @see https://bugs.php.net/bug.php?id=21641
+ * @var integer
+ */
+ protected $headerSize = 8192;
+
+ /**
+ * block size will always be 8192 for a PHP stream
+ * @see https://bugs.php.net/bug.php?id=21641
+ * @var integer
+ */
+ protected $blockSize = 8192;
+
+ /** @var \OC\Files\View */
+ protected $view;
+
+ /** @var array */
+ protected $ocHeaderKeys;
+
+ /** @var \OC\User\Manager */
+ protected $userManager;
+
+ /** @var array paths excluded from encryption */
+ protected $excludedPaths;
+
+ /**
+ * @param \OC\Files\View $view root view
+ */
+ public function __construct(\OC\Files\View $view, \OC\User\Manager $userManager) {
+ $this->ocHeaderKeys = [
+ self::HEADER_ENCRYPTION_MODULE_KEY
+ ];
+
+ $this->view = $view;
+ $this->userManager = $userManager;
+
+ $this->excludedPaths[] = 'files_encryption';
+ }
+
+ /**
+ * read encryption module ID from header
+ *
+ * @param array $header
+ * @return string
+ */
+ public function getEncryptionModuleId(array $header) {
+ $id = '';
+ $encryptionModuleKey = self::HEADER_ENCRYPTION_MODULE_KEY;
+
+ if (isset($header[$encryptionModuleKey])) {
+ $id = $header[$encryptionModuleKey];
+ }
+
+ return $id;
+ }
+
+ /**
+ * read header into array
+ *
+ * @param string $header
+ * @return array
+ */
+ public function readHeader($header) {
+
+ $result = array();
+
+ if (substr($header, 0, strlen(self::HEADER_START)) === self::HEADER_START) {
+ $endAt = strpos($header, self::HEADER_END);
+ if ($endAt !== false) {
+ $header = substr($header, 0, $endAt + strlen(self::HEADER_END));
+
+ // +1 to not start with an ':' which would result in empty element at the beginning
+ $exploded = explode(':', substr($header, strlen(self::HEADER_START)+1));
+
+ $element = array_shift($exploded);
+ while ($element !== self::HEADER_END) {
+ $result[$element] = array_shift($exploded);
+ $element = array_shift($exploded);
+ }
+ }
+ }
+
+ return $result;
+ }
+
+ /**
+ * create header for encrypted file
+ *
+ * @param array $headerData
+ * @param IEncryptionModule $encryptionModule
+ * @return string
+ * @throws EncryptionHeaderToLargeException if header has to many arguments
+ * @throws EncryptionHeaderKeyExistsException if header key is already in use
+ */
+ public function createHeader(array $headerData, IEncryptionModule $encryptionModule) {
+ $header = self::HEADER_START . ':' . self::HEADER_ENCRYPTION_MODULE_KEY . ':' . $encryptionModule->getId() . ':';
+ foreach ($headerData as $key => $value) {
+ if (in_array($key, $this->ocHeaderKeys)) {
+ throw new EncryptionHeaderKeyExistsException('header key "'. $key . '" already reserved by ownCloud');
+ }
+ $header .= $key . ':' . $value . ':';
+ }
+ $header .= self::HEADER_END;
+
+ if (strlen($header) > $this->getHeaderSize()) {
+ throw new EncryptionHeaderToLargeException('max header size exceeded', EncryptionException::ENCRYPTION_HEADER_TO_LARGE);
+ }
+
+ $paddedHeader = str_pad($header, $this->headerSize, self::HEADER_PADDING_CHAR, STR_PAD_RIGHT);
+
+ return $paddedHeader;
+ }
+
+ /**
+ * 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
+ * @param strinf $mountPoint
+ * @return array with list of files relative to the users files folder
+ */
+ public function getAllFiles($dir, $mountPoint = '') {
+ $result = array();
+ $dirList = array($dir);
+
+ while ($dirList) {
+ $dir = array_pop($dirList);
+ $content = $this->view->getDirectoryContent($dir);
+
+ foreach ($content as $c) {
+ // getDirectoryContent() returns the paths relative to the mount points, so we need
+ // to re-construct the complete path
+ $path = ($mountPoint !== '') ? $mountPoint . '/' . $c['path'] : $c['path'];
+ if ($c['type'] === 'dir') {
+ $dirList[] = $path;
+ } else {
+ $result[] = $path;
+ }
+ }
+
+ }
+
+ return $result;
+ }
+
+ /**
+ * check if it is a file uploaded by the user stored in data/user/files
+ * or a metadata file
+ *
+ * @param string $path
+ * @return boolean
+ */
+ protected function isFile($path) {
+ if (substr($path, 0, strlen('/files/')) === '/files/') {
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * return size of encryption header
+ *
+ * @return integer
+ */
+ public function getHeaderSize() {
+ return $this->headerSize;
+ }
+
+ /**
+ * return size of block read by a PHP stream
+ *
+ * @return integer
+ */
+ public function getBlockSize() {
+ return $this->blockSize;
+ }
+
+ /**
+ * get the owner and the path for the owner
+ *
+ * @param string $path
+ * @return array
+ * @throws \BadMethodCallException
+ */
+ public function getUidAndFilename($path) {
+
+ $parts = explode('/', $path);
+ $uid = '';
+ if (count($parts) > 2) {
+ $uid = $parts[1];
+ }
+ if (!$this->userManager->userExists($uid)) {
+ throw new \BadMethodCallException('path needs to be relative to the system wide data folder and point to a user specific file');
+ }
+
+ $pathinfo = pathinfo($path);
+ $partfile = false;
+ $parentFolder = false;
+ if (array_key_exists('extension', $pathinfo) && $pathinfo['extension'] === 'part') {
+ // if the real file exists we check this file
+ $filePath = $pathinfo['dirname'] . '/' . $pathinfo['filename'];
+ if ($this->view->file_exists($filePath)) {
+ $pathToCheck = $pathinfo['dirname'] . '/' . $pathinfo['filename'];
+ } else { // otherwise we look for the parent
+ $pathToCheck = $pathinfo['dirname'];
+ $parentFolder = true;
+ }
+ $partfile = true;
+ } else {
+ $pathToCheck = $path;
+ }
+
+ $pathToCheck = substr($pathToCheck, strlen('/' . $uid));
+
+ $this->view->chroot('/' . $uid);
+ $owner = $this->view->getOwner($pathToCheck);
+
+ // Check that UID is valid
+ if (!$this->userManager->userExists($owner)) {
+ throw new \BadMethodCallException('path needs to be relative to the system wide data folder and point to a user specific file');
+ }
+
+ \OC\Files\Filesystem::initMountPoints($owner);
+
+ $info = $this->view->getFileInfo($pathToCheck);
+ $this->view->chroot('/' . $owner);
+ $ownerPath = $this->view->getPath($info->getId());
+ $this->view->chroot('/');
+
+ if ($parentFolder) {
+ $ownerPath = $ownerPath . '/'. $pathinfo['filename'];
+ }
+
+ if ($partfile) {
+ $ownerPath = $ownerPath . '.' . $pathinfo['extension'];
+ }
+
+ return array(
+ $owner,
+ \OC\Files\Filesystem::normalizePath($ownerPath)
+ );
+ }
+
+ /**
+ * Remove .path extension from a file path
+ * @param string $path Path that may identify a .part file
+ * @return string File path without .part extension
+ * @note this is needed for reusing keys
+ */
+ public function stripPartialFileExtension($path) {
+ $extension = pathinfo($path, PATHINFO_EXTENSION);
+
+ if ( $extension === 'part') {
+
+ $newLength = strlen($path) - 5; // 5 = strlen(".part")
+ $fPath = substr($path, 0, $newLength);
+
+ // if path also contains a transaction id, we remove it too
+ $extension = pathinfo($fPath, PATHINFO_EXTENSION);
+ if(substr($extension, 0, 12) === 'ocTransferId') { // 12 = strlen("ocTransferId")
+ $newLength = strlen($fPath) - strlen($extension) -1;
+ $fPath = substr($fPath, 0, $newLength);
+ }
+ return $fPath;
+
+ } else {
+ return $path;
+ }
+ }
+
+ protected function getUserWithAccessToMountPoint($users, $groups) {
+ $result = array();
+ if (in_array('all', $users)) {
+ $result = \OCP\User::getUsers();
+ } else {
+ $result = array_merge($result, $users);
+ foreach ($groups as $group) {
+ $result = array_merge($result, \OC_Group::usersInGroup($group));
+ }
+ }
+
+ return $result;
+ }
+
+ /**
+ * check if the file is stored on a system wide mount point
+ * @param string $path relative to /data/user with leading '/'
+ * @return boolean
+ */
+ public function isSystemWideMountPoint($path) {
+ $normalizedPath = ltrim($path, '/');
+ if (\OCP\App::isEnabled("files_external")) {
+ $mounts = \OC_Mount_Config::getSystemMountPoints();
+ foreach ($mounts as $mount) {
+ if ($mount['mountpoint'] == substr($normalizedPath, 0, strlen($mount['mountpoint']))) {
+ if ($this->isMountPointApplicableToUser($mount)) {
+ return true;
+ }
+ }
+ }
+ }
+ return false;
+ }
+
+ /**
+ * check if it is a path which is excluded by ownCloud from encryption
+ *
+ * @param string $path
+ * @return boolean
+ */
+ public function isExcluded($path) {
+ $root = explode('/', $path, 2);
+ if (isset($root[0])) {
+ if (in_array($root[0], $this->excludedPaths)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+}
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