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<?php
/**
* @copyright Copyright (c) 2016 Lukas Reschke <lukas@statuscode.ch>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Security\IdentityProof;
use OC\Files\AppData\Factory;
use OCP\Files\IAppData;
use OCP\IConfig;
use OCP\IUser;
use OCP\Security\ICrypto;
class Manager {
/** @var IAppData */
private $appData;
/** @var ICrypto */
private $crypto;
/** @var IConfig */
private $config;
/**
* @param Factory $appDataFactory
* @param ICrypto $crypto
* @param IConfig $config
*/
public function __construct(Factory $appDataFactory,
ICrypto $crypto,
IConfig $config
) {
$this->appData = $appDataFactory->get('identityproof');
$this->crypto = $crypto;
$this->config = $config;
}
/**
* Calls the openssl functions to generate a public and private key.
* In a separate function for unit testing purposes.
*
* @return array [$publicKey, $privateKey]
*/
protected function generateKeyPair() {
$config = [
'digest_alg' => 'sha512',
'private_key_bits' => 2048,
];
// Generate new key
$res = openssl_pkey_new($config);
openssl_pkey_export($res, $privateKey);
// Extract the public key from $res to $pubKey
$publicKey = openssl_pkey_get_details($res);
$publicKey = $publicKey['key'];
return [$publicKey, $privateKey];
}
/**
* Generate a key for a given ID
* Note: If a key already exists it will be overwritten
*
* @param string $id key id
* @return Key
*/
protected function generateKey($id) {
list($publicKey, $privateKey) = $this->generateKeyPair();
// Write the private and public key to the disk
try {
$this->appData->newFolder($id);
} catch (\Exception $e) {}
$folder = $this->appData->getFolder($id);
$folder->newFile('private')
->putContent($this->crypto->encrypt($privateKey));
$folder->newFile('public')
->putContent($publicKey);
return new Key($publicKey, $privateKey);
}
/**
* Get key for a specific id
*
* @param string $id
* @return Key
*/
protected function retrieveKey($id) {
try {
$folder = $this->appData->getFolder($id);
$privateKey = $this->crypto->decrypt(
$folder->getFile('private')->getContent()
);
$publicKey = $folder->getFile('public')->getContent();
return new Key($publicKey, $privateKey);
} catch (\Exception $e) {
return $this->generateKey($id);
}
}
/**
* Get public and private key for $user
*
* @param IUser $user
* @return Key
*/
public function getKey(IUser $user) {
$uid = $user->getUID();
return $this->retrieveKey('user-' . $uid);
}
/**
* Get instance wide public and private key
*
* @return Key
* @throws \RuntimeException
*/
public function getSystemKey() {
$instanceId = $this->config->getSystemValue('instanceid', null);
if ($instanceId === null) {
throw new \RuntimeException('no instance id!');
}
return $this->retrieveKey('system-' . $instanceId);
}
}
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