nextcloud/apps/files_encryption/lib/session.php

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<?php
/**
* ownCloud
*
* @author Sam Tuke
* @copyright 2012 Sam Tuke samtuke@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;
/**
* Class for handling encryption related session data
*/
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class Session {
private $view;
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const NOT_INITIALIZED = '0';
const INIT_EXECUTED = '1';
const INIT_SUCCESSFUL = '2';
/**
* if session is started, check if ownCloud key pair is set up, if not create it
* @param \OC\Files\View $view
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*
* @note The ownCloud key pair is used to allow public link sharing even if encryption is enabled
*/
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public function __construct($view) {
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$this->view = $view;
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if (!$this->view->is_dir('owncloud_private_key')) {
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$this->view->mkdir('owncloud_private_key');
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}
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$appConfig = \OC::$server->getAppConfig();
$publicShareKeyId = $appConfig->getValue('files_encryption', 'publicShareKeyId');
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if ($publicShareKeyId === null) {
$publicShareKeyId = 'pubShare_' . substr(md5(time()), 0, 8);
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$appConfig->setValue('files_encryption', 'publicShareKeyId', $publicShareKeyId);
}
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if (
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!$this->view->file_exists("/public-keys/" . $publicShareKeyId . ".public.key")
|| !$this->view->file_exists("/owncloud_private_key/" . $publicShareKeyId . ".private.key")
) {
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$keypair = Crypt::createKeypair();
// Disable encryption proxy to prevent recursive calls
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
// Save public key
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if (!$view->is_dir('/public-keys')) {
$view->mkdir('/public-keys');
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}
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$this->view->file_put_contents('/public-keys/' . $publicShareKeyId . '.public.key', $keypair['publicKey']);
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// Encrypt private key empty passphrase
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$encryptedPrivateKey = Crypt::symmetricEncryptFileContent($keypair['privateKey'], '');
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// Save private key
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$this->view->file_put_contents(
'/owncloud_private_key/' . $publicShareKeyId . '.private.key', $encryptedPrivateKey);
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\OC_FileProxy::$enabled = $proxyStatus;
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}
if (\OCA\Encryption\Helper::isPublicAccess()) {
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// Disable encryption proxy to prevent recursive calls
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
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$encryptedKey = $this->view->file_get_contents(
'/owncloud_private_key/' . $publicShareKeyId . '.private.key');
$privateKey = Crypt::decryptPrivateKey($encryptedKey, '');
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$this->setPublicSharePrivateKey($privateKey);
$this->setInitialized(\OCA\Encryption\Session::INIT_SUCCESSFUL);
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\OC_FileProxy::$enabled = $proxyStatus;
}
}
/**
* Sets user private key to session
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* @param string $privateKey
* @return bool
*
* @note this should only be set on login
*/
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public function setPrivateKey($privateKey) {
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\OC::$session->set('privateKey', $privateKey);
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return true;
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}
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/**
* Sets status of encryption app
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* @param string $init INIT_SUCCESSFUL, INIT_EXECUTED, NOT_INITIALIZED
* @return bool
*
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* @note this doesn not indicate of the init was successful, we just remeber the try!
*/
public function setInitialized($init) {
\OC::$session->set('encryptionInitialized', $init);
return true;
}
/**
* remove encryption keys and init status from session
*/
public function closeSession() {
\OC::$session->remove('encryptionInitialized');
\OC::$session->remove('privateKey');
}
/**
* Gets status if we already tried to initialize the encryption app
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* @return string init status INIT_SUCCESSFUL, INIT_EXECUTED, NOT_INITIALIZED
*
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* @note this doesn not indicate of the init was successful, we just remeber the try!
*/
public function getInitialized() {
if (!is_null(\OC::$session->get('encryptionInitialized'))) {
return \OC::$session->get('encryptionInitialized');
} else {
return self::NOT_INITIALIZED;
}
}
/**
* Gets user or public share private key from session
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* @return string $privateKey The user's plaintext private key
*
*/
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public function getPrivateKey() {
// return the public share private key if this is a public access
if (\OCA\Encryption\Helper::isPublicAccess()) {
return $this->getPublicSharePrivateKey();
} else {
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if (!is_null(\OC::$session->get('privateKey'))) {
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return \OC::$session->get('privateKey');
} else {
return false;
}
}
}
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/**
* Sets public user private key to session
* @param string $privateKey
* @return bool
*/
public function setPublicSharePrivateKey($privateKey) {
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\OC::$session->set('publicSharePrivateKey', $privateKey);
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return true;
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}
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/**
* Gets public share private key from session
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* @return string $privateKey
*
*/
public function getPublicSharePrivateKey() {
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if (!is_null(\OC::$session->get('publicSharePrivateKey'))) {
return \OC::$session->get('publicSharePrivateKey');
} else {
return false;
}
}
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/**
* Sets user legacy key to session
* @param string $legacyKey
* @return bool
*/
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public function setLegacyKey($legacyKey) {
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\OC::$session->set('legacyKey', $legacyKey);
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return true;
}
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/**
* Gets user legacy key from session
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* @return string $legacyKey The user's plaintext legacy key
*
*/
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public function getLegacyKey() {
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if (!is_null(\OC::$session->get('legacyKey'))) {
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return \OC::$session->get('legacyKey');
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} else {
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return false;
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}
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}
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}