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sources/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
*/
class Session {
private $view;
/**
* @brief if session is started, check if ownCloud key pair is set up, if not create it
* @param \OC_FilesystemView $view
*
* @note The ownCloud key pair is used to allow public link sharing even if encryption is enabled
*/
public function __construct($view) {
$this->view = $view;
if (!$this->view->is_dir('owncloud_private_key')) {
$this->view->mkdir('owncloud_private_key');
}
$publicShareKeyId = \OC_Appconfig::getValue('files_encryption', 'publicShareKeyId');
if ($publicShareKeyId === null) {
$publicShareKeyId = 'pubShare_' . substr(md5(time()), 0, 8);
\OC_Appconfig::setValue('files_encryption', 'publicShareKeyId', $publicShareKeyId);
}
if (
!$this->view->file_exists("/public-keys/" . $publicShareKeyId . ".public.key")
|| !$this->view->file_exists("/owncloud_private_key/" . $publicShareKeyId . ".private.key")
) {
$keypair = Crypt::createKeypair();
// Disable encryption proxy to prevent recursive calls
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
// Save public key
if (!$view->is_dir('/public-keys')) {
$view->mkdir('/public-keys');
}
$this->view->file_put_contents('/public-keys/' . $publicShareKeyId . '.public.key', $keypair['publicKey']);
// Encrypt private key empty passphrase
$encryptedPrivateKey = Crypt::symmetricEncryptFileContent($keypair['privateKey'], '');
// Save private key
$this->view->file_put_contents(
'/owncloud_private_key/' . $publicShareKeyId . '.private.key', $encryptedPrivateKey);
\OC_FileProxy::$enabled = $proxyStatus;
}
if (\OCA\Encryption\Helper::isPublicAccess()) {
// Disable encryption proxy to prevent recursive calls
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
$encryptedKey = $this->view->file_get_contents(
'/owncloud_private_key/' . $publicShareKeyId . '.private.key');
$privateKey = Crypt::decryptPrivateKey($encryptedKey, '');
$this->setPublicSharePrivateKey($privateKey);
\OC_FileProxy::$enabled = $proxyStatus;
}
}
/**
* @brief Sets user private key to session
* @param string $privateKey
* @return bool
*
* @note this should only be set on login
*/
public function setPrivateKey($privateKey) {
$_SESSION['privateKey'] = $privateKey;
return true;
}
/**
* @brief Gets user or public share private key from session
* @returns string $privateKey The user's plaintext private key
*
*/
public function getPrivateKey() {
// return the public share private key if this is a public access
if (\OCA\Encryption\Helper::isPublicAccess()) {
return $this->getPublicSharePrivateKey();
} else {
if (isset($_SESSION['privateKey']) && !empty($_SESSION['privateKey'])) {
return $_SESSION['privateKey'];
} else {
return false;
}
}
}
/**
* @brief Sets public user private key to session
* @param string $privateKey
* @return bool
*/
public function setPublicSharePrivateKey($privateKey) {
$_SESSION['publicSharePrivateKey'] = $privateKey;
return true;
}
/**
* @brief Gets public share private key from session
* @returns string $privateKey
*
*/
public function getPublicSharePrivateKey() {
if (isset($_SESSION['publicSharePrivateKey']) && !empty($_SESSION['publicSharePrivateKey'])) {
return $_SESSION['publicSharePrivateKey'];
} else {
return false;
}
}
/**
* @brief Sets user legacy key to session
* @param $legacyKey
* @return bool
*/
public function setLegacyKey($legacyKey) {
$_SESSION['legacyKey'] = $legacyKey;
return true;
}
/**
* @brief Gets user legacy key from session
* @returns string $legacyKey The user's plaintext legacy key
*
*/
public function getLegacyKey() {
if (
isset($_SESSION['legacyKey'])
&& !empty($_SESSION['legacyKey'])
) {
return $_SESSION['legacyKey'];
} else {
return false;
}
}
}
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