Work on post_share hook for files_encryption
New method in OCP\Share{}:: getUsersSharingFile()
Development shapshot
This commit is contained in:
Sam Tuke
parent
1aba986d9f
commit
b3e59ca1e3
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@ -166,14 +166,77 @@ class Hooks {
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*/
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public static function postShared( $params ) {
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// Delete existing catfile
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Keymanager::deleteFileKey( );
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// NOTE: $params is an array with these keys:
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// itemSource -> int, filecache file ID
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// shareWith -> string, uid of user being shared to
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// fileTarget -> path of file being shared
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// uidOwner -> owner of the original file being shared
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// Generate new catfile and env keys
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Crypt::multiKeyEncrypt( $plainContent, $publicKeys );
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$view = new \OC_FilesystemView( '/' );
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$userId = \OCP\User::getUser();
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$util = new Util( $view, $userId );
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$shares = \OCP\Share::getUsersSharingFile( $params['fileTarget'] );
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$userIds = array();
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foreach ( $shares as $share ) {
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$util = new Util( $view, $share['userId'] );
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// Check that the user is encryption capable
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if ( $util->ready() ) {
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// Construct array of just UIDs for Keymanager{}
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$userIds[] = $share['userId'];
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} else {
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// Log warning; we can't do necessary setup here
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// because we don't have the user passphrase
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// TODO: Provide user feedback indicating that
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// sharing failed
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\OC_Log::write( 'Encryption library', 'File cannot be shared: user "'.$share['userId'].'" is not setup for encryption', \OC_Log::WARN );
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}
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}
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trigger_error("UIDS = ".var_export($userIds, 1));
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$userPubKeys = Keymanager::getPublicKeys( $view, $userIds );
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// trigger_error("PUB KEYS = ".var_export($userPubKeys, 1));
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// TODO: Fetch path from Crypt{} getter
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$plainContent = $view->file_get_contents( $userId . '/' . 'files'. '/' . $params['fileTarget'] );
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// Generate new catfile and share keys
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if ( ! $encrypted = Crypt::multiKeyEncrypt( $plainContent, $userPubKeys ) ) {
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// If the re-encryption failed, don't risk deleting data
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return false;
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}
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trigger_error("ENCRYPTED = ". var_export($encrypted, 1));
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// Save env keys to user folders
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foreach ( $encrypted['keys'] as $key ) {
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// Keymanager::setShareKey( $view, $params['fileTarget'], $userId, $key );
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}
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// Delete existing catfile
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// Check if keyfile exists (it won't if file has been shared before)
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// Do this last to ensure file is recoverable in case of error
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if ( $util->isEncryptedPath( $params['fileTarget'] ) ) {
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// NOTE: This will trigger an error if keyfile isn't found
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// Keymanager::deleteFileKey( $params['fileTarget'] );
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}
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}
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@ -1,267 +1,244 @@
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<?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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* @brief Class to manage storage and retrieval of encryption keys
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* @note Where a method requires a view object, it's root must be '/'
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*/
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class Keymanager {
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<?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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* @brief Class to manage storage and retrieval of encryption keys
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* @note Where a method requires a view object, it's root must be '/'
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*/
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class Keymanager {
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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( \OC_FilesystemView $view, $user ) {
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$path = '/' . $user . '/' . 'files_encryption' . '/' . $user.'.private.key';
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$key = $view->file_get_contents( $path );
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return $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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* @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( \OC_FilesystemView $view, $user ) {
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$path = '/' . $user . '/' . 'files_encryption' . '/' . $user.'.private.key';
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$key = $view->file_get_contents( $path );
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return $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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* @param \OC_FilesystemView $view
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* @param $userId
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* @return string public key or false
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*/
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public static function getPublicKey( \OC_FilesystemView $view, $userId ) {
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return $view->file_get_contents( '/public-keys/' . '/' . $userId . '.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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* @return string public key or false
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*/
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public static function getPublicKey( \OC_FilesystemView $view, $userId ) {
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return $view->file_get_contents( '/public-keys/' . '/' . $userId . '.public.key' );
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}
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/**
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* @brief Retrieve a user's public and private key
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* @param \OC_FilesystemView $view
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* @param $userId
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* @return array keys: privateKey, publicKey
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*/
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public static function getUserKeys( \OC_FilesystemView $view, $userId ) {
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return array(
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'publicKey' => self::getPublicKey( $view, $userId )
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, 'privateKey' => self::getPrivateKey( $view, $userId )
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);
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}
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/**
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* @brief Retrieve public keys of all users with access to a file
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* @param string $path Path to file
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* @return array of public keys for the given file
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* @note Checks that the sharing app is enabled should be performed
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* by client code, that isn't checked here
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*/
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public static function getPublicKeys( \OC_FilesystemView $view, $userId, $filePath ) {
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$path = ltrim( $path, '/' );
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$filepath = '/' . $userId . '/files/' . $filePath;
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// Check if sharing is enabled
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if ( OC_App::isEnabled( 'files_sharing' ) ) {
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} else {
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// check if it is a file owned by the user and not shared at all
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$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 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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* @note The keyfile is not encrypted here. Client code must
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* asymmetrically encrypt the keyfile before passing it to this method
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*/
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public static function setFileKey( \OC_FilesystemView $view, $path, $userId, $catfile ) {
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$basePath = '/' . $userId . '/files_encryption/keyfiles';
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$targetPath = self::keySetPreparation( $view, $path, $basePath, $userId );
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if ( $view->is_dir( $basePath . '/' . $targetPath ) ) {
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} else {
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// Save the keyfile in parallel directory
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return $view->file_put_contents( $basePath . '/' . $targetPath . '.key', $catfile );
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}
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}
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/**
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* @brief retrieve keyfile for an encrypted file
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* @return array keys: privateKey, publicKey
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*/
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public static function getUserKeys( \OC_FilesystemView $view, $userId ) {
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return array(
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'publicKey' => self::getPublicKey( $view, $userId )
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, 'privateKey' => self::getPrivateKey( $view, $userId )
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);
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}
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/**
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* @brief Retrieve public keys for given users
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* @param \OC_FilesystemView $view
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* @param array $userIds
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* @return array of public keys for the specified users
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*/
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public static function getPublicKeys( \OC_FilesystemView $view, $userIds ) {
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$i = 0;
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$keys = array();
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foreach ( $userIds as $userId ) {
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$i++;
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$keys[$userId] = self::getPublicKey( $view, $userId );
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}
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$keys['total'] = $i;
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return $keys;
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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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* @note The keyfile is not encrypted here. Client code must
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* asymmetrically encrypt the keyfile before passing it to this method
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*/
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public static function setFileKey( \OC_FilesystemView $view, $path, $userId, $catfile ) {
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$basePath = '/' . $userId . '/files_encryption/keyfiles';
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$targetPath = self::keySetPreparation( $view, $path, $basePath, $userId );
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if ( $view->is_dir( $basePath . '/' . $targetPath ) ) {
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} else {
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// Save the keyfile in parallel directory
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return $view->file_put_contents( $basePath . '/' . $targetPath . '.key', $catfile );
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}
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}
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/**
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* @brief retrieve keyfile for an encrypted file
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* @param \OC_FilesystemView $view
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* @param $userId
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* @param $filePath
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* @internal param \OCA\Encryption\file $string name
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* @return string file key or false
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* @note The keyfile returned is asymmetrically encrypted. Decryption
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* of the keyfile must be performed by client code
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*/
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public static function getFileKey( \OC_FilesystemView $view, $userId, $filePath ) {
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$filePath_f = ltrim( $filePath, '/' );
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$catfilePath = '/' . $userId . '/files_encryption/keyfiles/' . $filePath_f . '.key';
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if ( $view->file_exists( $catfilePath ) ) {
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return $view->file_get_contents( $catfilePath );
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} else {
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return false;
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}
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}
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/**
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* @brief Delete a keyfile
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*
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* @note The keyfile returned is asymmetrically encrypted. Decryption
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* of the keyfile must be performed by client code
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*/
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public static function getFileKey( \OC_FilesystemView $view, $userId, $filePath ) {
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$filePath_f = ltrim( $filePath, '/' );
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$catfilePath = '/' . $userId . '/files_encryption/keyfiles/' . $filePath_f . '.key';
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if ( $view->file_exists( $catfilePath ) ) {
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return $view->file_get_contents( $catfilePath );
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} else {
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return false;
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}
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}
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/**
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* @brief Delete a keyfile
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*
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* @param OC_FilesystemView $view
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* @param string $userId username
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* @param string $path path of the file the key belongs to
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* @return bool Outcome of unlink operation
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* @note $path must be relative to data/user/files. e.g. mydoc.txt NOT
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* /data/admin/files/mydoc.txt
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*/
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public static function deleteFileKey( \OC_FilesystemView $view, $userId, $path ) {
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$trimmed = ltrim( $path, '/' );
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$keyPath = '/' . $userId . '/files_encryption/keyfiles/' . $trimmed . '.key';
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// Unlink doesn't tell us if file was deleted (not found returns
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// true), so we perform our own test
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if ( $view->file_exists( $keyPath ) ) {
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return $view->unlink( $keyPath );
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} else {
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\OC_Log::write( 'Encryption library', 'Could not delete keyfile; does not exist: "' . $keyPath, \OC_Log::ERROR );
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return false;
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}
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}
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/**
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* @brief store private key from the user
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* @param string key
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* @return bool
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* @note Encryption of the private key must be performed by client code
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* as no encryption takes place here
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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( '/' . $user . '/files_encryption' );
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\OC_FileProxy::$enabled = false;
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if ( !$view->file_exists( '' ) ) $view->mkdir( '' );
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return $view->file_put_contents( $user . '.private.key', $key );
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\OC_FileProxy::$enabled = true;
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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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\OC_FileProxy::$enabled = false;
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if ( !$view->file_exists( '' ) ) $view->mkdir( '' );
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return $view->file_put_contents( \OCP\User::getUser() . '.public.key', $key );
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\OC_FileProxy::$enabled = true;
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}
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/**
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*/
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public static function deleteFileKey( \OC_FilesystemView $view, $userId, $path ) {
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$trimmed = ltrim( $path, '/' );
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$keyPath = '/' . $userId . '/files_encryption/keyfiles/' . $trimmed . '.key';
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// Unlink doesn't tell us if file was deleted (not found returns
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// true), so we perform our own test
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if ( $view->file_exists( $keyPath ) ) {
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return $view->unlink( $keyPath );
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} else {
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\OC_Log::write( 'Encryption library', 'Could not delete keyfile; does not exist: "' . $keyPath, \OC_Log::ERROR );
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return false;
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}
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}
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/**
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* @brief store private key from the user
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* @param string key
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* @return bool
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* @note Encryption of the private key must be performed by client code
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* as no encryption takes place here
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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( '/' . $user . '/files_encryption' );
|
||||
|
||||
\OC_FileProxy::$enabled = false;
|
||||
|
||||
if ( !$view->file_exists( '' ) ) $view->mkdir( '' );
|
||||
|
||||
return $view->file_put_contents( $user . '.private.key', $key );
|
||||
|
||||
\OC_FileProxy::$enabled = true;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief store private keys from the user
|
||||
*
|
||||
* @param string privatekey
|
||||
* @param string publickey
|
||||
* @return bool true/false
|
||||
*/
|
||||
public static function setUserKeys($privatekey, $publickey) {
|
||||
|
||||
return ( self::setPrivateKey( $privatekey ) && self::setPublicKey( $publickey ) );
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief store public key of the user
|
||||
*
|
||||
* @param string key
|
||||
* @return bool true/false
|
||||
*/
|
||||
public static function setPublicKey( $key ) {
|
||||
|
||||
$view = new \OC_FilesystemView( '/public-keys' );
|
||||
|
||||
\OC_FileProxy::$enabled = false;
|
||||
|
||||
if ( !$view->file_exists( '' ) ) $view->mkdir( '' );
|
||||
|
||||
return $view->file_put_contents( \OCP\User::getUser() . '.public.key', $key );
|
||||
|
||||
\OC_FileProxy::$enabled = true;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief store file encryption key
|
||||
*
|
||||
* @param string $path relative path of the file, including filename
|
||||
|
|
@ -271,70 +248,70 @@ class Keymanager {
|
|||
* @return bool true/false
|
||||
* @note The keyfile is not encrypted here. Client code must
|
||||
* asymmetrically encrypt the keyfile before passing it to this method
|
||||
*/
|
||||
public static function setShareKey( \OC_FilesystemView $view, $path, $userId, $shareKey ) {
|
||||
|
||||
$basePath = '/' . $userId . '/files_encryption/share-keys';
|
||||
|
||||
$shareKeyPath = self::keySetPreparation( $view, $path, $basePath, $userId );
|
||||
|
||||
return $view->file_put_contents( $basePath . '/' . $shareKeyPath . '.shareKey', $shareKey );
|
||||
|
||||
*/
|
||||
public static function setShareKey( \OC_FilesystemView $view, $path, $userId, $shareKey ) {
|
||||
|
||||
$basePath = '/' . $userId . '/files_encryption/share-keys';
|
||||
|
||||
$shareKeyPath = self::keySetPreparation( $view, $path, $basePath, $userId );
|
||||
|
||||
return $view->file_put_contents( $basePath . '/' . $shareKeyPath . '.shareKey', $shareKey );
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Make preparations to vars and filesystem for saving a keyfile
|
||||
*/
|
||||
public static function keySetPreparation( \OC_FilesystemView $view, $path, $basePath, $userId ) {
|
||||
|
||||
$targetPath = ltrim( $path, '/' );
|
||||
|
||||
$path_parts = pathinfo( $targetPath );
|
||||
|
||||
// If the file resides within a subdirectory, create it
|
||||
|
||||
$targetPath = ltrim( $path, '/' );
|
||||
|
||||
$path_parts = pathinfo( $targetPath );
|
||||
|
||||
// If the file resides within a subdirectory, create it
|
||||
if (
|
||||
isset( $path_parts['dirname'] )
|
||||
&& ! $view->file_exists( $basePath . '/' . $path_parts['dirname'] )
|
||||
) {
|
||||
|
||||
$view->mkdir( $basePath . '/' . $path_parts['dirname'] );
|
||||
|
||||
}
|
||||
|
||||
) {
|
||||
|
||||
$view->mkdir( $basePath . '/' . $path_parts['dirname'] );
|
||||
|
||||
}
|
||||
|
||||
return $targetPath;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief change password of private encryption key
|
||||
*
|
||||
* @param string $oldpasswd old password
|
||||
* @param string $newpasswd new password
|
||||
* @return bool true/false
|
||||
*/
|
||||
public static function changePasswd($oldpasswd, $newpasswd) {
|
||||
|
||||
if ( \OCP\User::checkPassword(\OCP\User::getUser(), $newpasswd) ) {
|
||||
return Crypt::changekeypasscode($oldpasswd, $newpasswd);
|
||||
}
|
||||
return false;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Fetch the legacy encryption key from user files
|
||||
* @param string $login used to locate the legacy key
|
||||
* @param string $passphrase used to decrypt the legacy key
|
||||
* @return true / false
|
||||
*
|
||||
* if the key is left out, the default handeler will be used
|
||||
*/
|
||||
public function getLegacyKey() {
|
||||
|
||||
$user = \OCP\User::getUser();
|
||||
$view = new \OC_FilesystemView( '/' . $user );
|
||||
return $view->file_get_contents( 'encryption.key' );
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief change password of private encryption key
|
||||
*
|
||||
* @param string $oldpasswd old password
|
||||
* @param string $newpasswd new password
|
||||
* @return bool true/false
|
||||
*/
|
||||
public static function changePasswd($oldpasswd, $newpasswd) {
|
||||
|
||||
if ( \OCP\User::checkPassword(\OCP\User::getUser(), $newpasswd) ) {
|
||||
return Crypt::changekeypasscode($oldpasswd, $newpasswd);
|
||||
}
|
||||
return false;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Fetch the legacy encryption key from user files
|
||||
* @param string $login used to locate the legacy key
|
||||
* @param string $passphrase used to decrypt the legacy key
|
||||
* @return true / false
|
||||
*
|
||||
* if the key is left out, the default handeler will be used
|
||||
*/
|
||||
public function getLegacyKey() {
|
||||
|
||||
$user = \OCP\User::getUser();
|
||||
$view = new \OC_FilesystemView( '/' . $user );
|
||||
return $view->file_get_contents( 'encryption.key' );
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -95,7 +95,8 @@ class Proxy extends \OC_FileProxy {
|
|||
|
||||
if ( self::shouldEncrypt( $path ) ) {
|
||||
|
||||
if ( !is_resource( $data ) ) { //stream put contents should have been converted to fopen
|
||||
// Stream put contents should have been converted to fopen
|
||||
if ( !is_resource( $data ) ) {
|
||||
|
||||
$userId = \OCP\USER::getUser();
|
||||
|
||||
|
|
@ -107,10 +108,33 @@ class Proxy extends \OC_FileProxy {
|
|||
// Disable encryption proxy to prevent recursive calls
|
||||
\OC_FileProxy::$enabled = false;
|
||||
|
||||
// TODO: Check if file is shared, if so, use multiKeyEncrypt
|
||||
$fileOwner = \OC\Files\Filesystem::getOwner( $path );
|
||||
|
||||
// Encrypt plain data and fetch key
|
||||
$encrypted = Crypt::keyEncryptKeyfile( $data, Keymanager::getPublicKey( $rootView, $userId ) );
|
||||
// Check if the keyfile needs to be shared
|
||||
if (
|
||||
$fileOwner !== true
|
||||
or $fileOwner !== $userId
|
||||
) {
|
||||
|
||||
// Shared storage backend isn't loaded
|
||||
|
||||
$users = \OCP\Share::getItemShared( 'file', $path, \OC_Share_backend_File::FORMAT_SHARED_STORAGE );
|
||||
//
|
||||
trigger_error("SHARE USERS = ". var_export($users, 1));
|
||||
//
|
||||
// $publicKeys = Keymanager::getPublicKeys( $rootView, $users);
|
||||
//
|
||||
// // Encrypt plain data to multiple users
|
||||
// $encrypted = Crypt::multiKeyEncrypt( $data, $publicKeys );
|
||||
|
||||
} else {
|
||||
|
||||
$publicKey = Keymanager::getPublicKey( $rootView, $userId );
|
||||
|
||||
// Encrypt plain data to a single user
|
||||
$encrypted = Crypt::keyEncryptKeyfile( $data, $publicKey );
|
||||
|
||||
}
|
||||
|
||||
// Replace plain content with encrypted content by reference
|
||||
$data = $encrypted['data'];
|
||||
|
|
|
|||
|
|
@ -91,6 +91,60 @@ class Share {
|
|||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Find which users can access a shared item
|
||||
* @param string Item type
|
||||
* @param int Format (optional) Format type must be defined by the backend
|
||||
* @param int Number of items to return (optional) Returns all by default
|
||||
* @return Return depends on format
|
||||
*/
|
||||
public static function getUsersSharingFile( $path ) {
|
||||
|
||||
// Fetch all shares of this file path from DB
|
||||
$query = \OC_DB::prepare(
|
||||
'SELECT
|
||||
share_type
|
||||
, share_with
|
||||
, permissions
|
||||
FROM
|
||||
`*PREFIX*share`
|
||||
WHERE
|
||||
file_target = ?'
|
||||
);
|
||||
|
||||
$result = $query->execute( array( $path ) );
|
||||
|
||||
if ( \OC_DB::isError( $result ) ) {
|
||||
|
||||
\OC_Log::write( 'OCP\Share', \OC_DB::getErrorMessage($result) . ', path=' . $path, \OC_Log::ERROR );
|
||||
|
||||
}
|
||||
|
||||
$shares = array();
|
||||
|
||||
while( $row = $result->fetchRow() ) {
|
||||
|
||||
// Set helpful array keys
|
||||
$shares[] = array(
|
||||
'userId' => $row['share_with']
|
||||
, 'shareType' => $row['share_type']
|
||||
, 'permissions' => $row['permissions']
|
||||
);
|
||||
|
||||
}
|
||||
|
||||
if ( ! empty( $shares ) ) {
|
||||
|
||||
return $shares;
|
||||
|
||||
} else {
|
||||
|
||||
return false;
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Get the items of item type shared with the current user
|
||||
|
|
|
|||
Loading…
Reference in New Issue