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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\Security\IdentityProof;
use OC\Files\AppData\Factory;
use OCP\Files\IAppData;
use OCP\IConfig;
use OCP\IUser;
use OCP\Security\ICrypto;
use Psr\Log\LoggerInterface;
class Manager {
private IAppData $appData;
public function __construct(
Factory $appDataFactory,
private ICrypto $crypto,
private IConfig $config,
private LoggerInterface $logger,
) {
$this->appData = $appDataFactory->get('identityproof');
}
/**
* Calls the openssl functions to generate a public and private key.
* In a separate function for unit testing purposes.
*
* @return array [$publicKey, $privateKey]
* @throws \RuntimeException
*/
protected function generateKeyPair(): array {
$config = [
'digest_alg' => 'sha512',
'private_key_bits' => 2048,
];
// Generate new key
$res = openssl_pkey_new($config);
if ($res === false) {
$this->logOpensslError();
throw new \RuntimeException('OpenSSL reported a problem');
}
if (openssl_pkey_export($res, $privateKey, null, $config) === false) {
$this->logOpensslError();
throw new \RuntimeException('OpenSSL reported a problem');
}
// 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
* @throws \RuntimeException
*/
protected function generateKey(string $id): Key {
[$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
*
* @throws \RuntimeException
*/
protected function retrieveKey(string $id): Key {
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
*
* @throws \RuntimeException
*/
public function getKey(IUser $user): Key {
$uid = $user->getUID();
return $this->retrieveKey('user-' . $uid);
}
/**
* Get instance wide public and private key
*
* @throws \RuntimeException
*/
public function getSystemKey(): Key {
$instanceId = $this->config->getSystemValue('instanceid', null);
if ($instanceId === null) {
throw new \RuntimeException('no instance id!');
}
return $this->retrieveKey('system-' . $instanceId);
}
private function logOpensslError(): void {
$errors = [];
while ($error = openssl_error_string()) {
$errors[] = $error;
}
$this->logger->critical('Something is wrong with your openssl setup: ' . implode(', ', $errors));
}
}
|
