160 lines
4.9 KiB
PHP
160 lines
4.9 KiB
PHP
<?php
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/***
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* ownCloud
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*
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* @author Bjoern Schiessle
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* @copyright 2012 Bjoern Schiessle <schiessle@owncloud.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OCA_Encryption;
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/**
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* This class provides basic operations to read/write encryption keys from/to the filesystem
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*/
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class Keymanager {
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# TODO: Try and get rid of username dependencies as these methods need to be used in a proxy class that doesn't have username access
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/**
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* @brief retrieve private key from a user
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*
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* @param string user name
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* @return string private key or false
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*/
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public static function getPrivateKey( $user ) {
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$view = new \OC_FilesystemView( '/' . $user . '/' . 'files_encryption' );
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return $view->file_get_contents( '/' . $user.'.private.key' );
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}
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/**
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* @brief retrieve public key from a user
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*
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* @param string user name
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* @return string private key or false
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*/
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public static function getPublicKey($user) {
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$view = new \OC_FilesystemView( '/public-keys/' );
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return $view->file_get_contents($user.'.public.key');
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}
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/**
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* @brief retrieve file encryption key
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*
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* @param string file name
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* @param string user name of the file owner
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* @return string file key or false
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*/
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public static function getFileKey($userId, $path) {
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$keypath = ltrim($path, '/');
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$user = $userId;
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// update $keypath and $user if path point to a file shared by someone else
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$query = \OC_DB::prepare( "SELECT uid_owner, source, target FROM `*PREFIX*sharing` WHERE target = ? AND uid_shared_with = ?" );
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$result = $query->execute( array ('/'.$userId.'/files/'.$keypath, $userId));
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if ($row = $result->fetchRow()){
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$keypath = $row['source'];
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$keypath_parts=explode('/',$keypath);
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$user = $keypath_parts[1];
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$keypath = str_replace('/'.$user.'/files/', '', $keypath);
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}
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$view = new \OC_FilesystemView('/'.$user.'/files_encryption/keyfiles/');
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return $view->file_get_contents($keypath.'.key');
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}
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/**
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* @brief store private key from a user
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*
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* @param string user name
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* @param string key
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* @return bool true/false
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*/
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public static function setPrivateKey($user, $key) {
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\OC_FileProxy::$enabled = false;
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$view = new \OC_FilesystemView('/'.$user.'/files_encryption');
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if (!$view->file_exists('')) $view->mkdir('');
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$result = $view->file_put_contents($user.'.private.key', $key);
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\OC_FileProxy::$enabled = true;
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return $result;
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}
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/**
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* @brief store public key from a user
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*
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* @param string user name
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* @param string key
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* @return bool true/false
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*/
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public static function setPublicKey($user, $key) {
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\OC_FileProxy::$enabled = false;
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$view = new \OC_FilesystemView('/public-keys');
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if (!$view->file_exists('')) $view->mkdir('');
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$result = $view->file_put_contents($user.'.public.key', $key);
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\OC_FileProxy::$enabled = true;
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return $result;
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}
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/**
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* @brief store file encryption key
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*
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* @param string $userId name of the file owner
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* @param string $path relative path of the file, including filename
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* @param string $key
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* @return bool true/false
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*/
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public static function setFileKey( $userId, $path, $key ) {
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\OC_FileProxy::$enabled = false;
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$targetpath = ltrim($path, '/');
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$user = $userId;
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// update $keytarget and $user if key belongs to a file shared by someone else
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$query = \OC_DB::prepare( "SELECT uid_owner, source, target FROM `*PREFIX*sharing` WHERE target = ? AND uid_shared_with = ?" );
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$result = $query->execute( array ('/'.$userId.'/files/'.$targetpath, $userId));
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if ($row = $result->fetchRow()){
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$targetpath = $row['source'];
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$targetpath_parts=explode('/',$targetpath);
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$user = $targetpath_parts[1];
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$targetpath = str_replace('/'.$user.'/files/', '', $targetpath);
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//TODO: check for write permission on shared file once the new sharing API is in place
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}
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$view = new \OC_FilesystemView( '/' . $user . '/files_encryption/keyfiles' );
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$path_parts = pathinfo($targetpath);
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if (!$view->file_exists($path_parts['dirname'])) $view->mkdir($path_parts['dirname']);
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$result = $view->file_put_contents( '/' . $targetpath . '.key', $key );
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\OC_FileProxy::$enabled = true;
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return $result;
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}
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} |