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- <?php
- /**
- * @copyright Copyright (c) 2016, ownCloud, Inc.
- *
- * @author Bjoern Schiessle <bjoern@schiessle.org>
- * @author Björn Schießle <bjoern@schiessle.org>
- * @author Joas Schilling <coding@schilljs.com>
- * @author Lukas Reschke <lukas@statuscode.ch>
- * @author Piotr M <mrow4a@yahoo.com>
- * @author Robin Appelman <robin@icewind.nl>
- * @author Thomas Müller <thomas.mueller@tmit.eu>
- * @author Vincent Petry <pvince81@owncloud.com>
- *
- * @license AGPL-3.0
- *
- * This code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License, version 3,
- * as published by the Free Software Foundation.
- *
- * This program 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, version 3,
- * along with this program. If not, see <http://www.gnu.org/licenses/>
- *
- */
- namespace OC\Files\Storage\Wrapper;
- use OC\Encryption\Exceptions\ModuleDoesNotExistsException;
- use OC\Encryption\Update;
- use OC\Encryption\Util;
- use OC\Files\Cache\CacheEntry;
- use OC\Files\Filesystem;
- use OC\Files\Mount\Manager;
- use OC\Files\Storage\LocalTempFileTrait;
- use OC\Memcache\ArrayCache;
- use OCP\Encryption\Exceptions\GenericEncryptionException;
- use OCP\Encryption\IFile;
- use OCP\Encryption\IManager;
- use OCP\Encryption\Keys\IStorage;
- use OCP\Files\Mount\IMountPoint;
- use OCP\Files\Storage;
- use OCP\ILogger;
- use OCP\Files\Cache\ICacheEntry;
- class Encryption extends Wrapper {
- use LocalTempFileTrait;
- /** @var string */
- private $mountPoint;
- /** @var \OC\Encryption\Util */
- private $util;
- /** @var \OCP\Encryption\IManager */
- private $encryptionManager;
- /** @var \OCP\ILogger */
- private $logger;
- /** @var string */
- private $uid;
- /** @var array */
- protected $unencryptedSize;
- /** @var \OCP\Encryption\IFile */
- private $fileHelper;
- /** @var IMountPoint */
- private $mount;
- /** @var IStorage */
- private $keyStorage;
- /** @var Update */
- private $update;
- /** @var Manager */
- private $mountManager;
- /** @var array remember for which path we execute the repair step to avoid recursions */
- private $fixUnencryptedSizeOf = array();
- /** @var ArrayCache */
- private $arrayCache;
- /**
- * @param array $parameters
- * @param IManager $encryptionManager
- * @param Util $util
- * @param ILogger $logger
- * @param IFile $fileHelper
- * @param string $uid
- * @param IStorage $keyStorage
- * @param Update $update
- * @param Manager $mountManager
- * @param ArrayCache $arrayCache
- */
- public function __construct(
- $parameters,
- IManager $encryptionManager = null,
- Util $util = null,
- ILogger $logger = null,
- IFile $fileHelper = null,
- $uid = null,
- IStorage $keyStorage = null,
- Update $update = null,
- Manager $mountManager = null,
- ArrayCache $arrayCache = null
- ) {
- $this->mountPoint = $parameters['mountPoint'];
- $this->mount = $parameters['mount'];
- $this->encryptionManager = $encryptionManager;
- $this->util = $util;
- $this->logger = $logger;
- $this->uid = $uid;
- $this->fileHelper = $fileHelper;
- $this->keyStorage = $keyStorage;
- $this->unencryptedSize = array();
- $this->update = $update;
- $this->mountManager = $mountManager;
- $this->arrayCache = $arrayCache;
- parent::__construct($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) {
- $fullPath = $this->getFullPath($path);
- /** @var CacheEntry $info */
- $info = $this->getCache()->get($path);
- if (isset($this->unencryptedSize[$fullPath])) {
- $size = $this->unencryptedSize[$fullPath];
- // update file cache
- if ($info instanceof ICacheEntry) {
- $info = $info->getData();
- $info['encrypted'] = $info['encryptedVersion'];
- } else {
- if (!is_array($info)) {
- $info = [];
- }
- $info['encrypted'] = true;
- }
- $info['size'] = $size;
- $this->getCache()->put($path, $info);
- return $size;
- }
- if (isset($info['fileid']) && $info['encrypted']) {
- return $this->verifyUnencryptedSize($path, $info['size']);
- }
- return $this->storage->filesize($path);
- }
- /**
- * @param string $path
- * @return array
- */
- public function getMetaData($path) {
- $data = $this->storage->getMetaData($path);
- if (is_null($data)) {
- return null;
- }
- $fullPath = $this->getFullPath($path);
- $info = $this->getCache()->get($path);
- if (isset($this->unencryptedSize[$fullPath])) {
- $data['encrypted'] = true;
- $data['size'] = $this->unencryptedSize[$fullPath];
- } else {
- if (isset($info['fileid']) && $info['encrypted']) {
- $data['size'] = $this->verifyUnencryptedSize($path, $info['size']);
- $data['encrypted'] = true;
- }
- }
- if (isset($info['encryptedVersion']) && $info['encryptedVersion'] > 1) {
- $data['encryptedVersion'] = $info['encryptedVersion'];
- }
- return $data;
- }
- /**
- * see http://php.net/manual/en/function.file_get_contents.php
- *
- * @param string $path
- * @return string
- */
- public function file_get_contents($path) {
- $encryptionModule = $this->getEncryptionModule($path);
- if ($encryptionModule) {
- $handle = $this->fopen($path, "r");
- if (!$handle) {
- return false;
- }
- $data = stream_get_contents($handle);
- fclose($handle);
- return $data;
- }
- return $this->storage->file_get_contents($path);
- }
- /**
- * 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');
- if (is_resource($handle)) {
- $written = fwrite($handle, $data);
- fclose($handle);
- return $written;
- }
- return false;
- }
- /**
- * see http://php.net/manual/en/function.unlink.php
- *
- * @param string $path
- * @return bool
- */
- public function unlink($path) {
- $fullPath = $this->getFullPath($path);
- if ($this->util->isExcluded($fullPath)) {
- return $this->storage->unlink($path);
- }
- $encryptionModule = $this->getEncryptionModule($path);
- if ($encryptionModule) {
- $this->keyStorage->deleteAllFileKeys($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) {
- $result = $this->storage->rename($path1, $path2);
- if ($result &&
- // versions always use the keys from the original file, so we can skip
- // this step for versions
- $this->isVersion($path2) === false &&
- $this->encryptionManager->isEnabled()) {
- $source = $this->getFullPath($path1);
- if (!$this->util->isExcluded($source)) {
- $target = $this->getFullPath($path2);
- if (isset($this->unencryptedSize[$source])) {
- $this->unencryptedSize[$target] = $this->unencryptedSize[$source];
- }
- $this->keyStorage->renameKeys($source, $target);
- $module = $this->getEncryptionModule($path2);
- if ($module) {
- $module->update($target, $this->uid, []);
- }
- }
- }
- return $result;
- }
- /**
- * see http://php.net/manual/en/function.rmdir.php
- *
- * @param string $path
- * @return bool
- */
- public function rmdir($path) {
- $result = $this->storage->rmdir($path);
- $fullPath = $this->getFullPath($path);
- if ($result &&
- $this->util->isExcluded($fullPath) === false &&
- $this->encryptionManager->isEnabled()
- ) {
- $this->keyStorage->deleteAllFileKeys($fullPath);
- }
- return $result;
- }
- /**
- * check if a file can be read
- *
- * @param string $path
- * @return bool
- */
- public function isReadable($path) {
- $isReadable = true;
- $metaData = $this->getMetaData($path);
- if (
- !$this->is_dir($path) &&
- isset($metaData['encrypted']) &&
- $metaData['encrypted'] === true
- ) {
- $fullPath = $this->getFullPath($path);
- $module = $this->getEncryptionModule($path);
- $isReadable = $module->isReadable($fullPath, $this->uid);
- }
- return $this->storage->isReadable($path) && $isReadable;
- }
- /**
- * see http://php.net/manual/en/function.copy.php
- *
- * @param string $path1
- * @param string $path2
- * @return bool
- */
- public function copy($path1, $path2) {
- $source = $this->getFullPath($path1);
- if ($this->util->isExcluded($source)) {
- return $this->storage->copy($path1, $path2);
- }
- // need to stream copy file by file in case we copy between a encrypted
- // and a unencrypted storage
- $this->unlink($path2);
- return $this->copyFromStorage($this, $path1, $path2);
- }
- /**
- * see http://php.net/manual/en/function.fopen.php
- *
- * @param string $path
- * @param string $mode
- * @return resource|bool
- * @throws GenericEncryptionException
- * @throws ModuleDoesNotExistsException
- */
- public function fopen($path, $mode) {
- // check if the file is stored in the array cache, this means that we
- // copy a file over to the versions folder, in this case we don't want to
- // decrypt it
- if ($this->arrayCache->hasKey('encryption_copy_version_' . $path)) {
- $this->arrayCache->remove('encryption_copy_version_' . $path);
- return $this->storage->fopen($path, $mode);
- }
- $encryptionEnabled = $this->encryptionManager->isEnabled();
- $shouldEncrypt = false;
- $encryptionModule = null;
- $header = $this->getHeader($path);
- $signed = isset($header['signed']) && $header['signed'] === 'true';
- $fullPath = $this->getFullPath($path);
- $encryptionModuleId = $this->util->getEncryptionModuleId($header);
- if ($this->util->isExcluded($fullPath) === false) {
- $size = $unencryptedSize = 0;
- $realFile = $this->util->stripPartialFileExtension($path);
- $targetExists = $this->file_exists($realFile) || $this->file_exists($path);
- $targetIsEncrypted = false;
- if ($targetExists) {
- // in case the file exists we require the explicit module as
- // specified in the file header - otherwise we need to fail hard to
- // prevent data loss on client side
- if (!empty($encryptionModuleId)) {
- $targetIsEncrypted = true;
- $encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
- }
- if ($this->file_exists($path)) {
- $size = $this->storage->filesize($path);
- $unencryptedSize = $this->filesize($path);
- } else {
- $size = $unencryptedSize = 0;
- }
- }
- try {
- if (
- $mode === 'w'
- || $mode === 'w+'
- || $mode === 'wb'
- || $mode === 'wb+'
- ) {
- // if we update a encrypted file with a un-encrypted one we change the db flag
- if ($targetIsEncrypted && $encryptionEnabled === false) {
- $cache = $this->storage->getCache();
- if ($cache) {
- $entry = $cache->get($path);
- $cache->update($entry->getId(), ['encrypted' => 0]);
- }
- }
- if ($encryptionEnabled) {
- // if $encryptionModuleId is empty, the default module will be used
- $encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
- $shouldEncrypt = $encryptionModule->shouldEncrypt($fullPath);
- $signed = true;
- }
- } else {
- $info = $this->getCache()->get($path);
- // only get encryption module if we found one in the header
- // or if file should be encrypted according to the file cache
- if (!empty($encryptionModuleId)) {
- $encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
- $shouldEncrypt = true;
- } else if (empty($encryptionModuleId) && $info['encrypted'] === true) {
- // we come from a old installation. No header and/or no module defined
- // but the file is encrypted. In this case we need to use the
- // OC_DEFAULT_MODULE to read the file
- $encryptionModule = $this->encryptionManager->getEncryptionModule('OC_DEFAULT_MODULE');
- $shouldEncrypt = true;
- $targetIsEncrypted = true;
- }
- }
- } catch (ModuleDoesNotExistsException $e) {
- $this->logger->logException($e, [
- 'message' => 'Encryption module "' . $encryptionModuleId . '" not found, file will be stored unencrypted',
- 'level' => ILogger::WARN,
- 'app' => 'core',
- ]);
- }
- // encryption disabled on write of new file and write to existing unencrypted file -> don't encrypt
- if (!$encryptionEnabled || !$this->shouldEncrypt($path)) {
- if (!$targetExists || !$targetIsEncrypted) {
- $shouldEncrypt = false;
- }
- }
- if ($shouldEncrypt === true && $encryptionModule !== null) {
- $headerSize = $this->getHeaderSize($path);
- $source = $this->storage->fopen($path, $mode);
- if (!is_resource($source)) {
- return false;
- }
- $handle = \OC\Files\Stream\Encryption::wrap($source, $path, $fullPath, $header,
- $this->uid, $encryptionModule, $this->storage, $this, $this->util, $this->fileHelper, $mode,
- $size, $unencryptedSize, $headerSize, $signed);
- return $handle;
- }
- }
- return $this->storage->fopen($path, $mode);
- }
- /**
- * perform some plausibility checks if the the unencrypted size is correct.
- * If not, we calculate the correct unencrypted size and return it
- *
- * @param string $path internal path relative to the storage root
- * @param int $unencryptedSize size of the unencrypted file
- *
- * @return int unencrypted size
- */
- protected function verifyUnencryptedSize($path, $unencryptedSize) {
- $size = $this->storage->filesize($path);
- $result = $unencryptedSize;
- if ($unencryptedSize < 0 ||
- ($size > 0 && $unencryptedSize === $size)
- ) {
- // check if we already calculate the unencrypted size for the
- // given path to avoid recursions
- if (isset($this->fixUnencryptedSizeOf[$this->getFullPath($path)]) === false) {
- $this->fixUnencryptedSizeOf[$this->getFullPath($path)] = true;
- try {
- $result = $this->fixUnencryptedSize($path, $size, $unencryptedSize);
- } catch (\Exception $e) {
- $this->logger->error('Couldn\'t re-calculate unencrypted size for '. $path);
- $this->logger->logException($e);
- }
- unset($this->fixUnencryptedSizeOf[$this->getFullPath($path)]);
- }
- }
- return $result;
- }
- /**
- * calculate the unencrypted size
- *
- * @param string $path internal path relative to the storage root
- * @param int $size size of the physical file
- * @param int $unencryptedSize size of the unencrypted file
- *
- * @return int calculated unencrypted size
- */
- protected function fixUnencryptedSize($path, $size, $unencryptedSize) {
- $headerSize = $this->getHeaderSize($path);
- $header = $this->getHeader($path);
- $encryptionModule = $this->getEncryptionModule($path);
- $stream = $this->storage->fopen($path, 'r');
- // if we couldn't open the file we return the old unencrypted size
- if (!is_resource($stream)) {
- $this->logger->error('Could not open ' . $path . '. Recalculation of unencrypted size aborted.');
- return $unencryptedSize;
- }
- $newUnencryptedSize = 0;
- $size -= $headerSize;
- $blockSize = $this->util->getBlockSize();
- // if a header exists we skip it
- if ($headerSize > 0) {
- fread($stream, $headerSize);
- }
- // fast path, else the calculation for $lastChunkNr is bogus
- if ($size === 0) {
- return 0;
- }
- $signed = isset($header['signed']) && $header['signed'] === 'true';
- $unencryptedBlockSize = $encryptionModule->getUnencryptedBlockSize($signed);
- // calculate last chunk nr
- // next highest is end of chunks, one subtracted is last one
- // we have to read the last chunk, we can't just calculate it (because of padding etc)
- $lastChunkNr = ceil($size/ $blockSize)-1;
- // calculate last chunk position
- $lastChunkPos = ($lastChunkNr * $blockSize);
- // try to fseek to the last chunk, if it fails we have to read the whole file
- if (@fseek($stream, $lastChunkPos, SEEK_CUR) === 0) {
- $newUnencryptedSize += $lastChunkNr * $unencryptedBlockSize;
- }
- $lastChunkContentEncrypted='';
- $count = $blockSize;
- while ($count > 0) {
- $data=fread($stream, $blockSize);
- $count=strlen($data);
- $lastChunkContentEncrypted .= $data;
- if(strlen($lastChunkContentEncrypted) > $blockSize) {
- $newUnencryptedSize += $unencryptedBlockSize;
- $lastChunkContentEncrypted=substr($lastChunkContentEncrypted, $blockSize);
- }
- }
- fclose($stream);
- // we have to decrypt the last chunk to get it actual size
- $encryptionModule->begin($this->getFullPath($path), $this->uid, 'r', $header, []);
- $decryptedLastChunk = $encryptionModule->decrypt($lastChunkContentEncrypted, $lastChunkNr . 'end');
- $decryptedLastChunk .= $encryptionModule->end($this->getFullPath($path), $lastChunkNr . 'end');
- // calc the real file size with the size of the last chunk
- $newUnencryptedSize += strlen($decryptedLastChunk);
- $this->updateUnencryptedSize($this->getFullPath($path), $newUnencryptedSize);
- // write to cache if applicable
- $cache = $this->storage->getCache();
- if ($cache) {
- $entry = $cache->get($path);
- $cache->update($entry['fileid'], ['size' => $newUnencryptedSize]);
- }
- return $newUnencryptedSize;
- }
- /**
- * @param Storage\IStorage $sourceStorage
- * @param string $sourceInternalPath
- * @param string $targetInternalPath
- * @param bool $preserveMtime
- * @return bool
- */
- public function moveFromStorage(Storage\IStorage $sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime = true) {
- if ($sourceStorage === $this) {
- return $this->rename($sourceInternalPath, $targetInternalPath);
- }
- // TODO clean this up once the underlying moveFromStorage in OC\Files\Storage\Wrapper\Common is fixed:
- // - call $this->storage->moveFromStorage() instead of $this->copyBetweenStorage
- // - copy the file cache update from $this->copyBetweenStorage to this method
- // - copy the copyKeys() call from $this->copyBetweenStorage to this method
- // - remove $this->copyBetweenStorage
- if (!$sourceStorage->isDeletable($sourceInternalPath)) {
- return false;
- }
- $result = $this->copyBetweenStorage($sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime, true);
- if ($result) {
- if ($sourceStorage->is_dir($sourceInternalPath)) {
- $result &= $sourceStorage->rmdir($sourceInternalPath);
- } else {
- $result &= $sourceStorage->unlink($sourceInternalPath);
- }
- }
- return $result;
- }
- /**
- * @param Storage\IStorage $sourceStorage
- * @param string $sourceInternalPath
- * @param string $targetInternalPath
- * @param bool $preserveMtime
- * @param bool $isRename
- * @return bool
- */
- public function copyFromStorage(Storage\IStorage $sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime = false, $isRename = false) {
- // TODO clean this up once the underlying moveFromStorage in OC\Files\Storage\Wrapper\Common is fixed:
- // - call $this->storage->copyFromStorage() instead of $this->copyBetweenStorage
- // - copy the file cache update from $this->copyBetweenStorage to this method
- // - copy the copyKeys() call from $this->copyBetweenStorage to this method
- // - remove $this->copyBetweenStorage
- return $this->copyBetweenStorage($sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime, $isRename);
- }
- /**
- * Update the encrypted cache version in the database
- *
- * @param Storage\IStorage $sourceStorage
- * @param string $sourceInternalPath
- * @param string $targetInternalPath
- * @param bool $isRename
- * @param bool $keepEncryptionVersion
- */
- private function updateEncryptedVersion(Storage\IStorage $sourceStorage, $sourceInternalPath, $targetInternalPath, $isRename, $keepEncryptionVersion) {
- $isEncrypted = $this->encryptionManager->isEnabled() && $this->shouldEncrypt($targetInternalPath);
- $cacheInformation = [
- 'encrypted' => $isEncrypted,
- ];
- if($isEncrypted) {
- $encryptedVersion = $sourceStorage->getCache()->get($sourceInternalPath)['encryptedVersion'];
- // In case of a move operation from an unencrypted to an encrypted
- // storage the old encrypted version would stay with "0" while the
- // correct value would be "1". Thus we manually set the value to "1"
- // for those cases.
- // See also https://github.com/owncloud/core/issues/23078
- if($encryptedVersion === 0 || !$keepEncryptionVersion) {
- $encryptedVersion = 1;
- }
- $cacheInformation['encryptedVersion'] = $encryptedVersion;
- }
- // in case of a rename we need to manipulate the source cache because
- // this information will be kept for the new target
- if ($isRename) {
- $sourceStorage->getCache()->put($sourceInternalPath, $cacheInformation);
- } else {
- $this->getCache()->put($targetInternalPath, $cacheInformation);
- }
- }
- /**
- * copy file between two storages
- *
- * @param Storage\IStorage $sourceStorage
- * @param string $sourceInternalPath
- * @param string $targetInternalPath
- * @param bool $preserveMtime
- * @param bool $isRename
- * @return bool
- * @throws \Exception
- */
- private function copyBetweenStorage(Storage\IStorage $sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime, $isRename) {
- // for versions we have nothing to do, because versions should always use the
- // key from the original file. Just create a 1:1 copy and done
- if ($this->isVersion($targetInternalPath) ||
- $this->isVersion($sourceInternalPath)) {
- // remember that we try to create a version so that we can detect it during
- // fopen($sourceInternalPath) and by-pass the encryption in order to
- // create a 1:1 copy of the file
- $this->arrayCache->set('encryption_copy_version_' . $sourceInternalPath, true);
- $result = $this->storage->copyFromStorage($sourceStorage, $sourceInternalPath, $targetInternalPath);
- $this->arrayCache->remove('encryption_copy_version_' . $sourceInternalPath);
- if ($result) {
- $info = $this->getCache('', $sourceStorage)->get($sourceInternalPath);
- // make sure that we update the unencrypted size for the version
- if (isset($info['encrypted']) && $info['encrypted'] === true) {
- $this->updateUnencryptedSize(
- $this->getFullPath($targetInternalPath),
- $info['size']
- );
- }
- $this->updateEncryptedVersion($sourceStorage, $sourceInternalPath, $targetInternalPath, $isRename, true);
- }
- return $result;
- }
- // first copy the keys that we reuse the existing file key on the target location
- // and don't create a new one which would break versions for example.
- $mount = $this->mountManager->findByStorageId($sourceStorage->getId());
- if (count($mount) === 1) {
- $mountPoint = $mount[0]->getMountPoint();
- $source = $mountPoint . '/' . $sourceInternalPath;
- $target = $this->getFullPath($targetInternalPath);
- $this->copyKeys($source, $target);
- } else {
- $this->logger->error('Could not find mount point, can\'t keep encryption keys');
- }
- if ($sourceStorage->is_dir($sourceInternalPath)) {
- $dh = $sourceStorage->opendir($sourceInternalPath);
- $result = $this->mkdir($targetInternalPath);
- if (is_resource($dh)) {
- while ($result and ($file = readdir($dh)) !== false) {
- if (!Filesystem::isIgnoredDir($file)) {
- $result &= $this->copyFromStorage($sourceStorage, $sourceInternalPath . '/' . $file, $targetInternalPath . '/' . $file, false, $isRename);
- }
- }
- }
- } else {
- try {
- $source = $sourceStorage->fopen($sourceInternalPath, 'r');
- $target = $this->fopen($targetInternalPath, 'w');
- list(, $result) = \OC_Helper::streamCopy($source, $target);
- fclose($source);
- fclose($target);
- } catch (\Exception $e) {
- fclose($source);
- fclose($target);
- throw $e;
- }
- if($result) {
- if ($preserveMtime) {
- $this->touch($targetInternalPath, $sourceStorage->filemtime($sourceInternalPath));
- }
- $this->updateEncryptedVersion($sourceStorage, $sourceInternalPath, $targetInternalPath, $isRename, false);
- } else {
- // delete partially written target file
- $this->unlink($targetInternalPath);
- // delete cache entry that was created by fopen
- $this->getCache()->remove($targetInternalPath);
- }
- }
- return (bool)$result;
- }
- /**
- * get the path to a local version of the file.
- * The local version of the file can be temporary and doesn't have to be persistent across requests
- *
- * @param string $path
- * @return string
- */
- public function getLocalFile($path) {
- if ($this->encryptionManager->isEnabled()) {
- $cachedFile = $this->getCachedFile($path);
- if (is_string($cachedFile)) {
- return $cachedFile;
- }
- }
- return $this->storage->getLocalFile($path);
- }
- /**
- * Returns the wrapped storage's value for isLocal()
- *
- * @return bool wrapped storage's isLocal() value
- */
- public function isLocal() {
- if ($this->encryptionManager->isEnabled()) {
- return false;
- }
- return $this->storage->isLocal();
- }
- /**
- * see http://php.net/manual/en/function.stat.php
- * only the following keys are required in the result: size and mtime
- *
- * @param string $path
- * @return array
- */
- public function stat($path) {
- $stat = $this->storage->stat($path);
- $fileSize = $this->filesize($path);
- $stat['size'] = $fileSize;
- $stat[7] = $fileSize;
- return $stat;
- }
- /**
- * see http://php.net/manual/en/function.hash.php
- *
- * @param string $type
- * @param string $path
- * @param bool $raw
- * @return string
- */
- public function hash($type, $path, $raw = false) {
- $fh = $this->fopen($path, 'rb');
- $ctx = hash_init($type);
- hash_update_stream($ctx, $fh);
- fclose($fh);
- return hash_final($ctx, $raw);
- }
- /**
- * 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 Filesystem::normalizePath($this->mountPoint . '/' . $path);
- }
- /**
- * read first block of encrypted file, typically this will contain the
- * encryption header
- *
- * @param string $path
- * @return string
- */
- protected function readFirstBlock($path) {
- $firstBlock = '';
- if ($this->storage->file_exists($path)) {
- $handle = $this->storage->fopen($path, 'r');
- $firstBlock = fread($handle, $this->util->getHeaderSize());
- fclose($handle);
- }
- return $firstBlock;
- }
- /**
- * return header size of given file
- *
- * @param string $path
- * @return int
- */
- protected function getHeaderSize($path) {
- $headerSize = 0;
- $realFile = $this->util->stripPartialFileExtension($path);
- if ($this->storage->file_exists($realFile)) {
- $path = $realFile;
- }
- $firstBlock = $this->readFirstBlock($path);
- if (substr($firstBlock, 0, strlen(Util::HEADER_START)) === Util::HEADER_START) {
- $headerSize = $this->util->getHeaderSize();
- }
- return $headerSize;
- }
- /**
- * parse raw header to array
- *
- * @param string $rawHeader
- * @return array
- */
- protected function parseRawHeader($rawHeader) {
- $result = array();
- if (substr($rawHeader, 0, strlen(Util::HEADER_START)) === Util::HEADER_START) {
- $header = $rawHeader;
- $endAt = strpos($header, Util::HEADER_END);
- if ($endAt !== false) {
- $header = substr($header, 0, $endAt + strlen(Util::HEADER_END));
- // +1 to not start with an ':' which would result in empty element at the beginning
- $exploded = explode(':', substr($header, strlen(Util::HEADER_START)+1));
- $element = array_shift($exploded);
- while ($element !== Util::HEADER_END) {
- $result[$element] = array_shift($exploded);
- $element = array_shift($exploded);
- }
- }
- }
- return $result;
- }
- /**
- * read header from file
- *
- * @param string $path
- * @return array
- */
- protected function getHeader($path) {
- $realFile = $this->util->stripPartialFileExtension($path);
- $exists = $this->storage->file_exists($realFile);
- if ($exists) {
- $path = $realFile;
- }
- $firstBlock = $this->readFirstBlock($path);
- $result = $this->parseRawHeader($firstBlock);
- // if the header doesn't contain a encryption module we check if it is a
- // legacy file. If true, we add the default encryption module
- if (!isset($result[Util::HEADER_ENCRYPTION_MODULE_KEY])) {
- if (!empty($result)) {
- $result[Util::HEADER_ENCRYPTION_MODULE_KEY] = 'OC_DEFAULT_MODULE';
- } else if ($exists) {
- // if the header was empty we have to check first if it is a encrypted file at all
- // We would do query to filecache only if we know that entry in filecache exists
- $info = $this->getCache()->get($path);
- if (isset($info['encrypted']) && $info['encrypted'] === true) {
- $result[Util::HEADER_ENCRYPTION_MODULE_KEY] = 'OC_DEFAULT_MODULE';
- }
- }
- }
- return $result;
- }
- /**
- * read encryption module needed to read/write the file located at $path
- *
- * @param string $path
- * @return null|\OCP\Encryption\IEncryptionModule
- * @throws ModuleDoesNotExistsException
- * @throws \Exception
- */
- protected function getEncryptionModule($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 . '" not loaded!');
- throw $e;
- }
- }
- return $encryptionModule;
- }
- /**
- * @param string $path
- * @param int $unencryptedSize
- */
- public function updateUnencryptedSize($path, $unencryptedSize) {
- $this->unencryptedSize[$path] = $unencryptedSize;
- }
- /**
- * copy keys to new location
- *
- * @param string $source path relative to data/
- * @param string $target path relative to data/
- * @return bool
- */
- protected function copyKeys($source, $target) {
- if (!$this->util->isExcluded($source)) {
- return $this->keyStorage->copyKeys($source, $target);
- }
- return false;
- }
- /**
- * check if path points to a files version
- *
- * @param $path
- * @return bool
- */
- protected function isVersion($path) {
- $normalized = Filesystem::normalizePath($path);
- return substr($normalized, 0, strlen('/files_versions/')) === '/files_versions/';
- }
- /**
- * check if the given storage should be encrypted or not
- *
- * @param $path
- * @return bool
- */
- protected function shouldEncrypt($path) {
- $fullPath = $this->getFullPath($path);
- $mountPointConfig = $this->mount->getOption('encrypt', true);
- if ($mountPointConfig === false) {
- return false;
- }
- try {
- $encryptionModule = $this->getEncryptionModule($fullPath);
- } catch (ModuleDoesNotExistsException $e) {
- return false;
- }
- if ($encryptionModule === null) {
- $encryptionModule = $this->encryptionManager->getEncryptionModule();
- }
- return $encryptionModule->shouldEncrypt($fullPath);
- }
- public function writeStream(string $path, $stream, int $size = null): int {
- // always fall back to fopen
- $target = $this->fopen($path, 'w');
- list($count, $result) = \OC_Helper::streamCopy($stream, $target);
- fclose($target);
- return $count;
- }
- }
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