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<?php
/***
* ownCloud
*
* @author Bjoern Schiessle
* @copyright 2012 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 OCA_Encryption;
/**
* This class provides basic operations to read/write encryption keys from/to the filesystem
*/
class Keymanager {
# TODO: make all dependencies explicit, such as ocfsview objects, by adding them as method arguments (dependency injection)
/**
* @brief retrieve private key from a user
*
* @param string user name
* @return string private key or false
*/
public static function getPrivateKey( $user ) {
$view = new \OC_FilesystemView( '/' . $user . '/' . 'files_encryption' );
return $view->file_get_contents( '/' . $user.'.private.key' );
}
/**
* @brief retrieve public key from a user
*
* @param string user name
* @return string private key or false
*/
public static function getPublicKey($user) {
$view = new \OC_FilesystemView( '/public-keys/' );
return $view->file_get_contents($user.'.public.key');
}
/**
* @brief retrieve file encryption key
*
* @param string file name
* @param string user name of the file owner
* @return string file key or false
*/
public static function getFileKey( $userId, $path ) {
$keypath = ltrim( $path, '/' );
$user = $userId;
// update $keypath and $user if path point to a file shared by someone else
$query = \OC_DB::prepare( "SELECT uid_owner, source, target FROM `*PREFIX*sharing` WHERE target = ? AND uid_shared_with = ?" );
$result = $query->execute( array ('/'.$userId.'/files/'.$keypath, $userId));
if ($row = $result->fetchRow()){
$keypath = $row['source'];
$keypath_parts=explode('/',$keypath);
$user = $keypath_parts[1];
$keypath = str_replace('/'.$user.'/files/', '', $keypath);
}
$view = new \OC_FilesystemView('/'.$user.'/files_encryption/keyfiles/');
return $view->file_get_contents($keypath.'.key');
}
/**
* @brief store private key from a user
*
* @param string user name
* @param string key
* @return bool true/false
*/
public static function setPrivateKey($user, $key) {
\OC_FileProxy::$enabled = false;
$view = new \OC_FilesystemView('/'.$user.'/files_encryption');
if (!$view->file_exists('')) $view->mkdir('');
$result = $view->file_put_contents($user.'.private.key', $key);
\OC_FileProxy::$enabled = true;
return $result;
}
/**
* @brief store public key from a user
*
* @param string user name
* @param string key
* @return bool true/false
*/
public static function setPublicKey($user, $key) {
\OC_FileProxy::$enabled = false;
$view = new \OC_FilesystemView('/public-keys');
if (!$view->file_exists('')) $view->mkdir('');
$result = $view->file_put_contents($user.'.public.key', $key);
\OC_FileProxy::$enabled = true;
return $result;
}
/**
* @brief store file encryption key
*
* @param string $userId name of the file owner
* @param string $path relative path of the file, including filename
* @param string $key
* @return bool true/false
*/
public static function setFileKey( $userId, $path, $key ) {
\OC_FileProxy::$enabled = false;
$targetpath = ltrim( $path, '/' );
$user = $userId;
// update $keytarget and $user if key belongs to a file shared by someone else
$query = \OC_DB::prepare( "SELECT uid_owner, source, target FROM `*PREFIX*sharing` WHERE target = ? AND uid_shared_with = ?" );
$result = $query->execute( array ( '/'.$userId.'/files/'.$targetpath, $userId ) );
if ( $row = $result->fetchRow( ) ) {
$targetpath = $row['source'];
$targetpath_parts=explode( '/',$targetpath );
$user = $targetpath_parts[1];
$targetpath = str_replace( '/'.$user.'/files/', '', $targetpath );
//TODO: check for write permission on shared file once the new sharing API is in place
}
$view = new \OC_FilesystemView( '/' . $user . '/files_encryption/keyfiles' );
$path_parts = pathinfo( $targetpath );
if ( !$view->file_exists( $path_parts['dirname'] ) ) $view->mkdir( $path_parts['dirname'] );
$result = $view->file_put_contents( '/' . $targetpath . '.key', $key );
\OC_FileProxy::$enabled = true;
return $result;
}
}
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