nextcloud/core/Service/LoginFlowV2Service.php

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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2019, Roeland Jago Douma <roeland@famdouma.nl>
*
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @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\Core\Service;
use OC\Authentication\Exceptions\InvalidTokenException;
use OC\Authentication\Exceptions\PasswordlessTokenException;
use OC\Authentication\Token\IProvider;
use OC\Authentication\Token\IToken;
use OC\Core\Data\LoginFlowV2Credentials;
use OC\Core\Data\LoginFlowV2Tokens;
use OC\Core\Db\LoginFlowV2;
use OC\Core\Db\LoginFlowV2Mapper;
use OC\Core\Exception\LoginFlowV2NotFoundException;
use OCP\AppFramework\Db\DoesNotExistException;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IConfig;
use OCP\ILogger;
use OCP\Security\ICrypto;
use OCP\Security\ISecureRandom;
class LoginFlowV2Service {
/** @var LoginFlowV2Mapper */
private $mapper;
/** @var ISecureRandom */
private $random;
/** @var ITimeFactory */
private $time;
/** @var IConfig */
private $config;
/** @var ICrypto */
private $crypto;
/** @var ILogger */
private $logger;
/** @var IProvider */
private $tokenProvider;
public function __construct(LoginFlowV2Mapper $mapper,
ISecureRandom $random,
ITimeFactory $time,
IConfig $config,
ICrypto $crypto,
ILogger $logger,
IProvider $tokenProvider) {
$this->mapper = $mapper;
$this->random = $random;
$this->time = $time;
$this->config = $config;
$this->crypto = $crypto;
$this->logger = $logger;
$this->tokenProvider = $tokenProvider;
}
/**
* @param string $pollToken
* @return LoginFlowV2Credentials
* @throws LoginFlowV2NotFoundException
*/
public function poll(string $pollToken): LoginFlowV2Credentials {
try {
$data = $this->mapper->getByPollToken($this->hashToken($pollToken));
} catch (DoesNotExistException $e) {
throw new LoginFlowV2NotFoundException('Invalid token');
}
$loginName = $data->getLoginName();
$server = $data->getServer();
$appPassword = $data->getAppPassword();
if ($loginName === null || $server === null || $appPassword === null) {
throw new LoginFlowV2NotFoundException('Token not yet ready');
}
// Remove the data from the DB
$this->mapper->delete($data);
try {
// Decrypt the apptoken
$privateKey = $this->crypto->decrypt($data->getPrivateKey(), $pollToken);
$appPassword = $this->decryptPassword($data->getAppPassword(), $privateKey);
} catch (\Exception $e) {
throw new LoginFlowV2NotFoundException('Apptoken could not be decrypted');
}
return new LoginFlowV2Credentials($server, $loginName, $appPassword);
}
/**
* @param string $loginToken
* @return LoginFlowV2
* @throws LoginFlowV2NotFoundException
*/
public function getByLoginToken(string $loginToken): LoginFlowV2 {
try {
return $this->mapper->getByLoginToken($loginToken);
} catch (DoesNotExistException $e) {
throw new LoginFlowV2NotFoundException('Login token invalid');
}
}
/**
* @param string $loginToken
* @return bool returns true if the start was successfull. False if not.
*/
public function startLoginFlow(string $loginToken): bool {
try {
$data = $this->mapper->getByLoginToken($loginToken);
} catch (DoesNotExistException $e) {
return false;
}
$data->setStarted(1);
$this->mapper->update($data);
return true;
}
/**
* @param string $loginToken
* @param string $sessionId
* @param string $server
* @param string $userId
* @return bool true if the flow was successfully completed false otherwise
*/
public function flowDone(string $loginToken, string $sessionId, string $server, string $userId): bool {
try {
$data = $this->mapper->getByLoginToken($loginToken);
} catch (DoesNotExistException $e) {
return false;
}
try {
$sessionToken = $this->tokenProvider->getToken($sessionId);
$loginName = $sessionToken->getLoginName();
try {
$password = $this->tokenProvider->getPassword($sessionToken, $sessionId);
} catch (PasswordlessTokenException $ex) {
$password = null;
}
} catch (InvalidTokenException $ex) {
return false;
}
$appPassword = $this->random->generate(72, ISecureRandom::CHAR_UPPER.ISecureRandom::CHAR_LOWER.ISecureRandom::CHAR_DIGITS);
$this->tokenProvider->generateToken(
$appPassword,
$userId,
$loginName,
$password,
$data->getClientName(),
IToken::PERMANENT_TOKEN,
IToken::DO_NOT_REMEMBER
);
$data->setLoginName($loginName);
$data->setServer($server);
// Properly encrypt
$data->setAppPassword($this->encryptPassword($appPassword, $data->getPublicKey()));
$this->mapper->update($data);
return true;
}
public function createTokens(string $userAgent): LoginFlowV2Tokens {
$flow = new LoginFlowV2();
$pollToken = $this->random->generate(128, ISecureRandom::CHAR_DIGITS.ISecureRandom::CHAR_LOWER.ISecureRandom::CHAR_UPPER);
$loginToken = $this->random->generate(128, ISecureRandom::CHAR_DIGITS.ISecureRandom::CHAR_LOWER.ISecureRandom::CHAR_UPPER);
$flow->setPollToken($this->hashToken($pollToken));
$flow->setLoginToken($loginToken);
$flow->setStarted(0);
$flow->setTimestamp($this->time->getTime());
$flow->setClientName($userAgent);
[$publicKey, $privateKey] = $this->getKeyPair();
$privateKey = $this->crypto->encrypt($privateKey, $pollToken);
$flow->setPublicKey($publicKey);
$flow->setPrivateKey($privateKey);
$this->mapper->insert($flow);
return new LoginFlowV2Tokens($loginToken, $pollToken);
}
private function hashToken(string $token): string {
$secret = $this->config->getSystemValue('secret');
return hash('sha512', $token . $secret);
}
private function getKeyPair(): array {
$config = array_merge([
'digest_alg' => 'sha512',
'private_key_bits' => 2048,
], $this->config->getSystemValue('openssl', []));
// Generate new key
$res = openssl_pkey_new($config);
if ($res === false) {
$this->logOpensslError();
throw new \RuntimeException('Could not initialize keys');
}
if (openssl_pkey_export($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];
}
private function logOpensslError(): void {
$errors = [];
while ($error = openssl_error_string()) {
$errors[] = $error;
}
$this->logger->critical('Something is wrong with your openssl setup: ' . implode(', ', $errors));
}
private function encryptPassword(string $password, string $publicKey): string {
openssl_public_encrypt($password, $encryptedPassword, $publicKey, OPENSSL_PKCS1_OAEP_PADDING);
$encryptedPassword = base64_encode($encryptedPassword);
return $encryptedPassword;
}
private function decryptPassword(string $encryptedPassword, string $privateKey): string {
$encryptedPassword = base64_decode($encryptedPassword);
openssl_private_decrypt($encryptedPassword, $password, $privateKey, OPENSSL_PKCS1_OAEP_PADDING);
return $password;
}
}