nextcloud/apps/files_encryption/lib/proxy.php

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<?php
/**
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* ownCloud
*
* @author Sam Tuke, Robin Appelman
* @copyright 2012 Sam Tuke samtuke@owncloud.com, Robin Appelman
* icewind1991@gmail.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/>.
*
*/
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/**
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* @brief Encryption proxy which handles filesystem operations before and after
* execution and encrypts, and handles keyfiles accordingly. Used for
* webui.
*/
namespace OCA\Encryption;
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/**
* Class Proxy
* @package OCA\Encryption
*/
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class Proxy extends \OC_FileProxy {
private static $blackList = null; //mimetypes blacklisted from encryption
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/**
* Check if a file requires encryption
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* @param string $path
* @return bool
*
* Tests if server side encryption is enabled, and file is allowed by blacklists
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*/
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private static function shouldEncrypt($path) {
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$userId = Helper::getUser($path);
if (\OCP\App::isEnabled('files_encryption') === false || Crypt::mode() !== 'server' ||
strpos($path, '/' . $userId . '/files') !== 0) {
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return false;
}
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if (is_null(self::$blackList)) {
self::$blackList = explode(',', \OCP\Config::getAppValue('files_encryption', 'type_blacklist', ''));
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}
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if (Crypt::isCatfileContent($path)) {
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return true;
}
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$extension = substr($path, strrpos($path, '.') + 1);
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if (array_search($extension, self::$blackList) === false) {
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return true;
}
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return false;
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}
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/**
* @param $path
* @param $data
* @return bool
*/
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public function preFile_put_contents($path, &$data) {
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if (self::shouldEncrypt($path)) {
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if (!is_resource($data)) {
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// get root view
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$view = new \OC_FilesystemView('/');
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// get relative path
$relativePath = \OCA\Encryption\Helper::stripUserFilesPath($path);
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if (!isset($relativePath)) {
return true;
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}
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// create random cache folder
$cacheFolder = rand();
$path_slices = explode('/', \OC_Filesystem::normalizePath($path));
$path_slices[2] = "cache/".$cacheFolder;
$tmpPath = implode('/', $path_slices);
$handle = fopen('crypt://' . $tmpPath, 'w');
if (is_resource($handle)) {
// write data to stream
fwrite($handle, $data);
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// close stream
fclose($handle);
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// disable encryption proxy to prevent recursive calls
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
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// get encrypted content
$data = $view->file_get_contents($tmpPath);
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// update file cache for target file
$tmpFileInfo = $view->getFileInfo($tmpPath);
$fileInfo = $view->getFileInfo($path);
if (is_array($fileInfo) && is_array($tmpFileInfo)) {
$fileInfo['encrypted'] = true;
$fileInfo['unencrypted_size'] = $tmpFileInfo['size'];
$view->putFileInfo($path, $fileInfo);
}
// remove our temp file
$view->deleteAll('/' . \OCP\User::getUser() . '/cache/' . $cacheFolder);
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// re-enable proxy - our work is done
\OC_FileProxy::$enabled = $proxyStatus;
}
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}
}
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return true;
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}
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/**
* @param string $path Path of file from which has been read
* @param string $data Data that has been read from file
*/
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public function postFile_get_contents($path, $data) {
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$plainData = null;
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$view = new \OC_FilesystemView('/');
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// init session
$session = new \OCA\Encryption\Session($view);
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// If data is a catfile
if (
Crypt::mode() === 'server'
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&& Crypt::isCatfileContent($data)
) {
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$handle = fopen('crypt://' . $path, 'r');
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if (is_resource($handle)) {
while (($plainDataChunk = fgets($handle, 8192)) !== false) {
$plainData .= $plainDataChunk;
}
}
} elseif (
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Crypt::mode() == 'server'
&& \OC::$session->exists('legacyenckey')
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&& Crypt::isEncryptedMeta($path)
) {
// Disable encryption proxy to prevent recursive calls
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
$plainData = Crypt::legacyBlockDecrypt($data, $session->getLegacyKey());
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\OC_FileProxy::$enabled = $proxyStatus;
}
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if (!isset($plainData)) {
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$plainData = $data;
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}
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return $plainData;
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}
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/**
* @brief When a file is deleted, remove its keyfile also
*/
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public function preUnlink($path) {
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$relPath = Helper::stripUserFilesPath($path);
// skip this method if the trash bin is enabled or if we delete a file
// outside of /data/user/files
if (\OCP\App::isEnabled('files_trashbin') || $relPath === false) {
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return true;
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}
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// Disable encryption proxy to prevent recursive calls
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$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
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$view = new \OC_FilesystemView('/');
$userId = \OCP\USER::getUser();
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$util = new Util($view, $userId);
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list($owner, $ownerPath) = $util->getUidAndFilename($relPath);
// Delete keyfile & shareKey so it isn't orphaned
if (!Keymanager::deleteFileKey($view, $ownerPath)) {
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\OCP\Util::writeLog('Encryption library',
'Keyfile or shareKey could not be deleted for file "' . $ownerPath . '"', \OCP\Util::ERROR);
}
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Keymanager::delAllShareKeys($view, $owner, $ownerPath);
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\OC_FileProxy::$enabled = $proxyStatus;
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// If we don't return true then file delete will fail; better
// to leave orphaned keyfiles than to disallow file deletion
return true;
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}
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/**
* @param $path
* @return bool
*/
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public function postTouch($path) {
$this->handleFile($path);
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return true;
}
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/**
* @param $path
* @param $result
* @return resource
*/
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public function postFopen($path, &$result) {
$path = \OC\Files\Filesystem::normalizePath($path);
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if (!$result) {
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return $result;
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}
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// split the path parts
$pathParts = explode('/', $path);
// don't try to encrypt/decrypt cache chunks or files in the trash bin
if (isset($pathParts[2]) && ($pathParts[2] === 'cache' || $pathParts[2] === 'files_trashbin')) {
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return $result;
}
// Disable encryption proxy to prevent recursive calls
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$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
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$meta = stream_get_meta_data($result);
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$view = new \OC_FilesystemView('');
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$userId = Helper::getUser($path);
$util = new Util($view, $userId);
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// If file is already encrypted, decrypt using crypto protocol
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if (
Crypt::mode() === 'server'
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&& $util->isEncryptedPath($path)
) {
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// Close the original encrypted file
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fclose($result);
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// Open the file using the crypto stream wrapper
// protocol and let it do the decryption work instead
$result = fopen('crypt://' . $path, $meta['mode']);
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} elseif (
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self::shouldEncrypt($path)
and $meta ['mode'] !== 'r'
and $meta['mode'] !== 'rb'
) {
$result = fopen('crypt://' . $path, $meta['mode']);
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}
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// Re-enable the proxy
\OC_FileProxy::$enabled = $proxyStatus;
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return $result;
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}
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/**
* @param $path
* @param $data
* @return array
*/
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public function postGetFileInfo($path, $data) {
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// if path is a folder do nothing
if (\OCP\App::isEnabled('files_encryption') && is_array($data) && array_key_exists('size', $data)) {
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// Disable encryption proxy to prevent recursive calls
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
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// get file size
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$data['size'] = self::postFileSize($path, $data['size']);
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// Re-enable the proxy
\OC_FileProxy::$enabled = $proxyStatus;
}
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return $data;
}
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/**
* @param $path
* @param $size
* @return bool
*/
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public function postFileSize($path, $size) {
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$view = new \OC_FilesystemView('/');
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$userId = Helper::getUser($path);
$util = new Util($view, $userId);
// if encryption is no longer enabled or if the files aren't migrated yet
// we return the default file size
if(!\OCP\App::isEnabled('files_encryption') ||
$util->getMigrationStatus() !== Util::MIGRATION_COMPLETED) {
return $size;
}
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// if path is a folder do nothing
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if ($view->is_dir($path)) {
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return $size;
}
// get relative path
$relativePath = \OCA\Encryption\Helper::stripUserFilesPath($path);
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// if path is empty we cannot resolve anything
if (empty($relativePath)) {
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return $size;
}
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$fileInfo = false;
// get file info from database/cache if not .part file
if (!Helper::isPartialFilePath($path)) {
$proxyState = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
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$fileInfo = $view->getFileInfo($path);
\OC_FileProxy::$enabled = $proxyState;
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}
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// if file is encrypted return real file size
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if (is_array($fileInfo) && $fileInfo['encrypted'] === true) {
// try to fix unencrypted file size if it doesn't look plausible
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if ((int)$fileInfo['size'] > 0 && (int)$fileInfo['unencrypted_size'] === 0 ) {
$fixSize = $util->getFileSize($path);
$fileInfo['unencrypted_size'] = $fixSize;
// put file info if not .part file
if (!Helper::isPartialFilePath($relativePath)) {
$view->putFileInfo($path, $fileInfo);
}
}
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$size = $fileInfo['unencrypted_size'];
} else {
// self healing if file was removed from file cache
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if (!is_array($fileInfo)) {
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$fileInfo = array();
}
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$fixSize = $util->getFileSize($path);
if ($fixSize > 0) {
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$size = $fixSize;
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$fileInfo['encrypted'] = true;
$fileInfo['unencrypted_size'] = $size;
// put file info if not .part file
if (!Helper::isPartialFilePath($relativePath)) {
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$view->putFileInfo($path, $fileInfo);
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}
}
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}
return $size;
}
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/**
* @param $path
*/
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public function handleFile($path) {
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// Disable encryption proxy to prevent recursive calls
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
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$view = new \OC_FilesystemView('/');
$session = new \OCA\Encryption\Session($view);
$userId = Helper::getUser($path);
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$util = new Util($view, $userId);
// split the path parts
$pathParts = explode('/', $path);
// get relative path
$relativePath = \OCA\Encryption\Helper::stripUserFilesPath($path);
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// only if file is on 'files' folder fix file size and sharing
if (isset($pathParts[2]) && $pathParts[2] === 'files' && $util->fixFileSize($path)) {
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// get sharing app state
$sharingEnabled = \OCP\Share::isEnabled();
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// get users
$usersSharing = $util->getSharingUsersArray($sharingEnabled, $relativePath);
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// update sharing-keys
$util->setSharedFileKeyfiles($session, $usersSharing, $relativePath);
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}
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\OC_FileProxy::$enabled = $proxyStatus;
}
}