1 files changed, 319 insertions, 0 deletions
diff --git a/lib/private/files/storage/wrapper/encryption.php b/lib/private/files/storage/wrapper/encryption.php
new file mode 100644
index 00000000000..44fc2124f7a
--- /dev/null
+++ b/lib/private/files/storage/wrapper/encryption.php
@@ -0,0 +1,319 @@
+<?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\Files\Storage\Wrapper;
+
+use OC\Encryption\Exceptions\ModuleDoesNotExistsException;
+
+class Encryption extends Wrapper {
+
+	/** @var string */
+	private $mountPoint;
+
+	/** @var \OC\Encryption\Util */
+	private $util;
+
+	/** @var \OC\Encryption\Manager */
+	private $encryptionManager;
+
+	/** @var \OC\Log */
+	private $logger;
+
+	/** @var string */
+	private $uid;
+
+	/** @var array */
+	private $unencryptedSize;
+
+	/**
+	 * @param array $parameters
+	 * @param \OC\Encryption\Manager $encryptionManager
+	 * @param \OC\Encryption\Util $util
+	 * @param \OC\Log $logger
+	 * @param string $uid user who perform the read/write operation (null for public access)
+	 */
+	public function __construct(
+			$parameters,
+			\OC\Encryption\Manager $encryptionManager = null,
+			\OC\Encryption\Util $util = null,
+			\OC\Log $logger = null,
+			$uid = null
+		) {
+
+		$this->mountPoint = $parameters['mountPoint'];
+		$this->encryptionManager = $encryptionManager;
+		$this->util = $util;
+		$this->logger = $logger;
+		$this->uid = $uid;
+		$this->unencryptedSize = array();
+		parent::__construct($parameters);
+	}
+
+	/**
+	 * see http://php.net/manual/en/function.filesize.php
+	 * The result for filesize when called on a folder is required to be 0
+	 *
+	 * @param string $path
+	 * @return int
+	 */
+	public function filesize($path) {
+		$size = 0;
+		$fullPath = $this->getFullPath($path);
+
+		$encryptedSize = $this->storage->filesize($path);
+
+		$info = $this->getCache()->get($path);
+
+		if($encryptedSize > 0 && $info['encrypted']) {
+			$size = $info['unencrypted_size'];
+			if ($size <= 0) {
+				$encryptionModule = $this->getEncryptionModule($path);
+				if ($encryptionModule) {
+					$size = $encryptionModule->calculateUnencryptedSize($fullPath);
+					$this->getCache()->update($info['fileid'], array('unencrypted_size' => $size));
+				}
+			}
+		} else if (isset($this->unencryptedSize[$fullPath]) && isset($info['fileid'])) {
+			$size = $this->unencryptedSize[$fullPath];
+			$info['encrypted'] = true;
+			$info['unencrypted_size'] = $size;
+			$info['size'] = $encryptedSize;
+			$this->getCache()->put($path, $info);
+		}
+
+		return $size;
+	}
+
+	/**
+	 * see http://php.net/manual/en/function.file_get_contents.php
+	 *
+	 * @param string $path
+	 * @return string
+	 */
+	public function file_get_contents($path) {
+
+		$data = null;
+		$encryptionModule = $this->getEncryptionModule($path);
+
+		if ($encryptionModule) {
+
+			$handle = $this->fopen($path, 'r');
+
+			if (is_resource($handle)) {
+				while (!feof($handle)) {
+					$data .= fread($handle, $this->util->getBlockSize());
+				}
+			}
+		} else {
+			$data = $this->storage->file_get_contents($path);
+		}
+
+		return $data;
+	}
+
+	/**
+	 * see http://php.net/manual/en/function.file_put_contents.php
+	 *
+	 * @param string $path
+	 * @param string $data
+	 * @return bool
+	 */
+	public function file_put_contents($path, $data) {
+		// file put content will always be translated to a stream write
+		$handle = $this->fopen($path, 'w');
+		fwrite($handle, $data);
+		return fclose($handle);
+	}
+
+	/**
+	 * see http://php.net/manual/en/function.unlink.php
+	 *
+	 * @param string $path
+	 * @return bool
+	 */
+	public function unlink($path) {
+		if ($this->util->isExcluded($path)) {
+			return $this->storage->unlink($path);
+		}
+
+		$encryptionModule = $this->getEncryptionModule($path);
+		if ($encryptionModule) {
+				$keyStorage = \OC::$server->getEncryptionKeyStorage($encryptionModule->getId());
+				$keyStorage->deleteAllFileKeys($this->getFullPath($path));
+		}
+
+		return $this->storage->unlink($path);
+	}
+
+	/**
+	 * see http://php.net/manual/en/function.rename.php
+	 *
+	 * @param string $path1
+	 * @param string $path2
+	 * @return bool
+	 */
+	public function rename($path1, $path2) {
+		if ($this->util->isExcluded($path1)) {
+			return $this->storage->rename($path1, $path2);
+		}
+
+		$fullPath1 = $this->getFullPath($path1);
+		list($owner, $source) = $this->util->getUidAndFilename($fullPath1);
+		$result = $this->storage->rename($path1, $path2);
+		if ($result) {
+			$fullPath2 = $this->getFullPath($path2);
+			$systemWide = $this->util->isSystemWideMountPoint($this->mountPoint);
+			list(, $target) = $this->util->getUidAndFilename($fullPath2);
+			$encryptionModule = $this->getEncryptionModule($path2);
+			if ($encryptionModule) {
+				$keyStorage = \OC::$server->getEncryptionKeyStorage($encryptionModule->getId());
+				$keyStorage->renameKeys($source, $target, $owner, $systemWide);
+			}
+		}
+
+		return $result;
+	}
+
+	/**
+	 * see http://php.net/manual/en/function.copy.php
+	 *
+	 * @param string $path1
+	 * @param string $path2
+	 * @return bool
+	 */
+	public function copy($path1, $path2) {
+		// todo copy encryption keys, get users with access to the file and reencrypt
+		// or is this to encryption module specific? Then we can hand this over
+		return $this->storage->copy($path1, $path2);
+	}
+
+	/**
+	 * see http://php.net/manual/en/function.fopen.php
+	 *
+	 * @param string $path
+	 * @param string $mode
+	 * @return resource
+	 */
+	public function fopen($path, $mode) {
+
+		$shouldEncrypt = false;
+		$encryptionModule = null;
+		$header = $this->getHeader($path);
+		$fullPath = $this->getFullPath($path);
+		$encryptionModuleId = $this->util->getEncryptionModuleId($header);
+
+		$size = $unencryptedSize = 0;
+		if ($this->file_exists($path)) {
+			$size = $this->storage->filesize($path);
+			$unencryptedSize = $this->filesize($path);
+		}
+
+		try {
+
+			if (
+				$mode === 'w'
+				|| $mode === 'w+'
+				|| $mode === 'wb'
+				|| $mode === 'wb+'
+			) {
+				if (!empty($encryptionModuleId)) {
+					$encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
+				} else {
+					$encryptionModule = $this->encryptionManager->getDefaultEncryptionModule();
+				}
+				$shouldEncrypt = $encryptionModule->shouldEncrypt($fullPath);
+			} else {
+				// only get encryption module if we found one in the header
+				if (!empty($encryptionModuleId)) {
+					$encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
+					$shouldEncrypt = true;
+				}
+			}
+		} catch (ModuleDoesNotExistsException $e) {
+			$this->logger->warning('Encryption module "' . $encryptionModuleId .
+				'" not found, file will be stored unencrypted');
+		}
+
+		if($shouldEncrypt === true && !$this->util->isExcluded($path) && $encryptionModule !== null) {
+			$source = $this->storage->fopen($path, $mode);
+			$handle = \OC\Files\Stream\Encryption::wrap($source, $path, $fullPath, $header,
+				$this->uid, $encryptionModule, $this->storage, $this, $this->util, $mode,
+				$size, $unencryptedSize);
+			return $handle;
+		} else {
+			return $this->storage->fopen($path, $mode);
+		}
+	}
+
+	/**
+	 * return full path, including mount point
+	 *
+	 * @param string $path relative to mount point
+	 * @return string full path including mount point
+	 */
+	protected function getFullPath($path) {
+		return \OC\Files\Filesystem::normalizePath($this->mountPoint . '/' . $path);
+	}
+
+	/**
+	 * read header from file
+	 *
+	 * @param string $path
+	 * @return array
+	 */
+	protected function getHeader($path) {
+		$header = '';
+		if ($this->storage->file_exists($path)) {
+			$handle = $this->storage->fopen($path, 'r');
+			$header = fread($handle, $this->util->getHeaderSize());
+			fclose($handle);
+		}
+		return $this->util->readHeader($header);
+	}
+
+	/**
+	 * read encryption module needed to read/write the file located at $path
+	 *
+	 * @param string $path
+	 * @return \OCP\Encryption\IEncryptionModule|null
+	 */
+	protected function getEncryptionModule($path) {
+		$encryptionModule = null;
+		$header = $this->getHeader($path);
+		$encryptionModuleId = $this->util->getEncryptionModuleId($header);
+		if (!empty($encryptionModuleId)) {
+			try {
+				$encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
+			} catch (ModuleDoesNotExistsException $e) {
+				$this->logger->critical('Encryption module defined in "' . $path . '" mot loaded!');
+				throw $e;
+			}
+		}
+		return $encryptionModule;
+	}
+
+	public function updateUnencryptedSize($path, $unencryptedSize) {
+		$this->unencryptedSize[$path] = $unencryptedSize;
+	}
+
+}