270 lines
7.7 KiB
PHP
270 lines
7.7 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: make all dependencies (including static classes) explicit, such as ocfsview objects, by adding them as method arguments (dependency injection)
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/**
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* @brief retrieve the ENCRYPTED private key from a user
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*
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* @return string private key or false
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* @note the key returned by this method must be decrypted before use
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*/
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public static function getPrivateKey( $user, $view ) {
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$view->chroot( '/' . $user . '/' . 'files_encryption' );
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return $view->file_get_contents( '/' . $user.'.private.key' );
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}
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/**
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* @brief retrieve public key for a specified user
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*
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* @return string public key or false
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*/
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public static function getPublicKey() {
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$user = \OCP\User::getUser();
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$view = new \OC_FilesystemView( '/public-keys/' );
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return $view->file_get_contents( '/' . $user . '.public.key' );
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}
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/**
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* @brief retrieve both keys from a user (private and public)
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*
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* @return string private key or false
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*/
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public static function getUserKeys() {
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return array(
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'privatekey' => self::getPrivateKey(),
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'publickey' => self::getPublicKey(),
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);
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}
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/**
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* @brief retrieve a list of the public key from all users with access to the file
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*
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* @param string path to file
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* @return array of public keys for the given file
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*/
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public static function getPublicKeys($path) {
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$userId = \OCP\User::getUser();
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$path = ltrim( $path, '/' );
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$filepath = '/'.$userId.'/files/'.$path;
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// check if file was shared with other users
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$query = \OC_DB::prepare( "SELECT uid_owner, source, target, uid_shared_with FROM `*PREFIX*sharing` WHERE ( target = ? AND uid_shared_with = ? ) OR source = ? " );
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$result = $query->execute( array ($filepath, $userId, $filepath));
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$users = array();
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if ($row = $result->fetchRow()){
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$source = $row['source'];
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$owner = $row['uid_owner'];
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$users[] = $owner;
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// get the uids of all user with access to the file
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$query = \OC_DB::prepare( "SELECT source, uid_shared_with FROM `*PREFIX*sharing` WHERE source = ?" );
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$result = $query->execute( array ($source));
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while ( ($row = $result->fetchRow()) ) {
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$users[] = $row['uid_shared_with'];
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}
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} else {
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// check if it is a file owned by the user and not shared at all
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$userview = new \OC_FilesystemView( '/'.$userId.'/files/' );
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if ($userview->file_exists($path)) {
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$users[] = $userId;
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}
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}
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$view = new \OC_FilesystemView( '/public-keys/' );
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$keylist = array();
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$count = 0;
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foreach ($users as $user) {
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$keylist['key'.++$count] = $view->file_get_contents($user.'.public.key');
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}
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return $keylist;
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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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* @return string file key or false
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*/
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public static function getFileKey( $path, $staticUserClass = 'OCP\User' ) {
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$keypath = ltrim( $path, '/' );
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$user = $staticUserClass::getUser();
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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 = $query->execute( array ('/'.$user.'/files/'.$keypath, $user));
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if ($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( $keypath . '.key' );
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}
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/**
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* @brief store private key from the user
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*
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* @param string key
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* @return bool true/false
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*/
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public static function setPrivateKey($key) {
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$user = \OCP\User::getUser();
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$view = new \OC_FilesystemView('/'.$user.'/files_encryption');
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if (!$view->file_exists('')) $view->mkdir('');
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return $view->file_put_contents($user.'.private.key', $key);
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}
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/**
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* @brief store private keys from the user
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*
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* @param string privatekey
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* @param string publickey
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* @return bool true/false
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*/
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public static function setUserKeys($privatekey, $publickey) {
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return (self::setPrivateKey($privatekey) && self::setPublicKey($publickey));
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}
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/**
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* @brief store public key of the user
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*
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* @param string key
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* @return bool true/false
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*/
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public static function setPublicKey($key) {
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$view = new \OC_FilesystemView('/public-keys');
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if (!$view->file_exists('')) $view->mkdir('');
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return $view->file_put_contents(\OCP\User::getUser().'.public.key', $key);
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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 $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( $path, $key, $view = Null, $dbClassName = '\OC_DB') {
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$targetPath = ltrim( $path, '/' );
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$user = \OCP\User::getUser();
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// update $keytarget and $user if key belongs to a file shared by someone else
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$query = $dbClassName::prepare( "SELECT uid_owner, source, target FROM `*PREFIX*sharing` WHERE target = ? AND uid_shared_with = ?" );
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$result = $query->execute( array ( '/'.$user.'/files/'.$targetPath, $user ) );
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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 = $targetPath_parts[1];
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$rootview = new \OC_FilesystemView( '/' );
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if ( ! $rootview->is_writable( $targetPath ) ) {
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\OC_Log::write( 'Encryption library', "File Key not updated because you don't have write access for the corresponding file", \OC_Log::ERROR );
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return false;
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}
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$targetPath = str_replace( '/'.$user.'/files/', '', $targetPath );
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//TODO: check for write permission on shared file once the new sharing API is in place
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}
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$path_parts = pathinfo( $targetPath );
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if ( !$view ) {
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$view = new \OC_FilesystemView( '/' );
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}
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$view->chroot( '/' . $user . '/files_encryption/keyfiles' );
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// If the file resides within a subdirectory, create it
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if ( ! $view->file_exists( $path_parts['dirname'] ) ) {
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$view->mkdir( $path_parts['dirname'] );
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}
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// Save the keyfile in parallel directory
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return $view->file_put_contents( '/' . $targetPath . '.key', $key );
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}
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/**
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* @brief change password of private encryption key
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*
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* @param string $oldpasswd old password
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* @param string $newpasswd new password
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* @return bool true/false
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*/
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public static function changePasswd($oldpasswd, $newpasswd) {
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if ( \OCP\User::checkPassword(\OCP\User::getUser(), $newpasswd) ) {
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return Crypt::changekeypasscode($oldpasswd, $newpasswd);
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}
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return false;
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}
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} |