Merge pull request #5959 from owncloud/encryption_check_if_file_is_encrypted

only check if the key file exists to decide if it is an encrypted file or not

apps/files_encryption/lib/keymanager.php

@@ -172,14 +172,13 @@ class Keymanager {
 	/**
 	 * @brief retrieve keyfile for an encrypted file
 	 * @param \OC_FilesystemView $view
-	 * @param $userId
 	 * @param $filePath
 	 * @internal param \OCA\Encryption\file $string name
 	 * @return string file key or false
 	 * @note The keyfile returned is asymmetrically encrypted. Decryption
 	 * of the keyfile must be performed by client code
 	 */
-	public static function getFileKey(\OC_FilesystemView $view, $userId, $filePath) {
+	public static function getFileKey(\OC_FilesystemView $view, $filePath) {
 
 		$util = new Util($view, \OCP\User::getUser());
 

apps/files_encryption/lib/stream.php

@@ -250,7 +250,7 @@ class Stream {
 
 		// Fetch and decrypt keyfile
 		// Fetch existing keyfile
-		$this->encKeyfile = Keymanager::getFileKey($this->rootView, $this->userId, $this->relPath);
+		$this->encKeyfile = Keymanager::getFileKey($this->rootView, $this->relPath);
 
 		// If a keyfile already exists
 		if ($this->encKeyfile) {

apps/files_encryption/lib/util.php

@@ -367,7 +367,7 @@ class Util {
 							// scanning every file like this
 							// will eat server resources :(
 							if (
-								Keymanager::getFileKey($this->view, $this->userId, $relPath)
+								Keymanager::getFileKey($this->view, $relPath)
 								&& $isEncryptedPath
 							) {
 
@@ -472,22 +472,19 @@ class Util {
 	 */
 	public function isEncryptedPath($path) {
 
-		// Disable encryption proxy so data retrieved is in its
-		// original form
-		$proxyStatus = \OC_FileProxy::$enabled;
-		\OC_FileProxy::$enabled = false;
+		$relPath = Helper::getPathToRealFile($path);
 
-		// we only need 24 byte from the last chunk
-		$data = '';
-		$handle = $this->view->fopen($path, 'r');
-		if (is_resource($handle) && !fseek($handle, -24, SEEK_END)) {
-			$data = fgets($handle);
+		if ($relPath === false) {
+			$relPath = Helper::stripUserFilesPath($path);
 		}
 
-		// re-enable proxy
-		\OC_FileProxy::$enabled = $proxyStatus;
+		$fileKey = Keymanager::getFileKey($this->view, $relPath);
 
-		return Crypt::isCatfileContent($data);
+		if ($fileKey === false) {
+			return false;
+		}
+
+		return true;
 
 	}
 
@@ -1059,7 +1056,7 @@ class Util {
 	private function decryptKeyfile($filePath, $privateKey) {
 
 		// Get the encrypted keyfile
-		$encKeyfile = Keymanager::getFileKey($this->view, $this->userId, $filePath);
+		$encKeyfile = Keymanager::getFileKey($this->view, $filePath);
 
 		// The file has a shareKey and must use it for decryption
 		$shareKey = Keymanager::getShareKey($this->view, $this->userId, $filePath);

apps/files_encryption/tests/crypt.php

@@ -176,7 +176,7 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
 		$this->assertNotEquals($this->dataShort, $retreivedCryptedFile);
 
 		// Get the encrypted keyfile
-		$encKeyfile = Encryption\Keymanager::getFileKey($this->view, $this->userId, $filename);
+		$encKeyfile = Encryption\Keymanager::getFileKey($this->view, $filename);
 
 		// Attempt to fetch the user's shareKey
 		$shareKey = Encryption\Keymanager::getShareKey($this->view, $this->userId, $filename);
@@ -244,13 +244,13 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
 		$i = 0;
 		while ($i < count($r)-1) {
 			$e[] = $r[$i] . $r[$i+1];
-			$i = $i + 2; 
+			$i = $i + 2;
 		}
 
 		//print_r($e);
 
 		// Get the encrypted keyfile
-		$encKeyfile = Encryption\Keymanager::getFileKey($this->view, $this->userId, $filename);
+		$encKeyfile = Encryption\Keymanager::getFileKey($this->view, $filename);
 
 		// Attempt to fetch the user's shareKey
 		$shareKey = Encryption\Keymanager::getShareKey($this->view, $this->userId, $filename);
@@ -387,7 +387,7 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
 	 * @brief test decryption using legacy blowfish method
 	 */
 	function testLegacyDecryptShort() {
-		
+
 		$crypted = $this->legacyEncrypt($this->dataShort, $this->pass);
 
 		$decrypted = Encryption\Crypt::legacyBlockDecrypt($crypted, $this->pass);
@@ -401,7 +401,7 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
 	 * @brief test decryption using legacy blowfish method
 	 */
 	function testLegacyDecryptLong() {
-		
+
 		$crypted = $this->legacyEncrypt($this->dataLong, $this->pass);
 
 		$decrypted = Encryption\Crypt::legacyBlockDecrypt($crypted, $this->pass);
@@ -653,8 +653,8 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
 		// tear down
 		$view->unlink($filename);
 	}
-	
-	
+
+
 	/**
 	 * @brief encryption using legacy blowfish method
 	 * @param $data string data to encrypt