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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\Authentication\Token;
use OC\Authentication\Exceptions\ExpiredTokenException;
use OC\Authentication\Exceptions\InvalidTokenException;
use OC\Authentication\Exceptions\PasswordlessTokenException;
use OC\Authentication\Exceptions\TokenPasswordExpiredException;
use OC\Authentication\Exceptions\WipeTokenException;
use OCP\AppFramework\Db\DoesNotExistException;
use OCP\AppFramework\Db\TTransactional;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\Authentication\Token\IToken as OCPIToken;
use OCP\ICache;
use OCP\ICacheFactory;
use OCP\IConfig;
use OCP\IDBConnection;
use OCP\IUserManager;
use OCP\Security\ICrypto;
use OCP\Security\IHasher;
use Psr\Log\LoggerInterface;
class PublicKeyTokenProvider implements IProvider {
public const TOKEN_MIN_LENGTH = 22;
/** Token cache TTL in seconds */
private const TOKEN_CACHE_TTL = 10;
use TTransactional;
/** @var PublicKeyTokenMapper */
private $mapper;
/** @var ICrypto */
private $crypto;
/** @var IConfig */
private $config;
private IDBConnection $db;
/** @var LoggerInterface */
private $logger;
/** @var ITimeFactory */
private $time;
/** @var ICache */
private $cache;
/** @var IHasher */
private $hasher;
public function __construct(PublicKeyTokenMapper $mapper,
ICrypto $crypto,
IConfig $config,
IDBConnection $db,
LoggerInterface $logger,
ITimeFactory $time,
IHasher $hasher,
ICacheFactory $cacheFactory) {
$this->mapper = $mapper;
$this->crypto = $crypto;
$this->config = $config;
$this->db = $db;
$this->logger = $logger;
$this->time = $time;
$this->cache = $cacheFactory->isLocalCacheAvailable()
? $cacheFactory->createLocal('authtoken_')
: $cacheFactory->createInMemory();
$this->hasher = $hasher;
}
/**
* {@inheritDoc}
*/
public function generateToken(string $token,
string $uid,
string $loginName,
?string $password,
string $name,
int $type = OCPIToken::TEMPORARY_TOKEN,
int $remember = OCPIToken::DO_NOT_REMEMBER,
?array $scope = null,
): OCPIToken {
if (strlen($token) < self::TOKEN_MIN_LENGTH) {
$exception = new InvalidTokenException('Token is too short, minimum of ' . self::TOKEN_MIN_LENGTH . ' characters is required, ' . strlen($token) . ' characters given');
$this->logger->error('Invalid token provided when generating new token', ['exception' => $exception]);
throw $exception;
}
if (mb_strlen($name) > 128) {
$name = mb_substr($name, 0, 120) . '…';
}
// We need to check against one old token to see if there is a password
// hash that we can reuse for detecting outdated passwords
$randomOldToken = $this->mapper->getFirstTokenForUser($uid);
$oldTokenMatches = $randomOldToken && $randomOldToken->getPasswordHash() && $password !== null && $this->hasher->verify(sha1($password) . $password, $randomOldToken->getPasswordHash());
$dbToken = $this->newToken($token, $uid, $loginName, $password, $name, $type, $remember);
if ($oldTokenMatches) {
$dbToken->setPasswordHash($randomOldToken->getPasswordHash());
}
if ($scope !== null) {
$dbToken->setScope($scope);
}
$this->mapper->insert($dbToken);
if (!$oldTokenMatches && $password !== null) {
$this->updatePasswords($uid, $password);
}
// Add the token to the cache
$this->cacheToken($dbToken);
return $dbToken;
}
public function getToken(string $tokenId): OCPIToken {
/**
* Token length: 72
* @see \OC\Core\Controller\ClientFlowLoginController::generateAppPassword
* @see \OC\Core\Controller\AppPasswordController::getAppPassword
* @see \OC\Core\Command\User\AddAppPassword::execute
* @see \OC\Core\Service\LoginFlowV2Service::flowDone
* @see \OCA\Talk\MatterbridgeManager::generatePassword
* @see \OCA\Preferred_Providers\Controller\PasswordController::generateAppPassword
* @see \OCA\GlobalSiteSelector\TokenHandler::generateAppPassword
*
* Token length: 22-256 - https://www.php.net/manual/en/session.configuration.php#ini.session.sid-length
* @see \OC\User\Session::createSessionToken
*
* Token length: 29
* @see \OCA\Settings\Controller\AuthSettingsController::generateRandomDeviceToken
* @see \OCA\Registration\Service\RegistrationService::generateAppPassword
*/
if (strlen($tokenId) < self::TOKEN_MIN_LENGTH) {
throw new InvalidTokenException('Token is too short for a generated token, should be the password during basic auth');
}
$tokenHash = $this->hashToken($tokenId);
if ($token = $this->getTokenFromCache($tokenHash)) {
$this->checkToken($token);
return $token;
}
try {
$token = $this->mapper->getToken($tokenHash);
$this->cacheToken($token);
} catch (DoesNotExistException $ex) {
try {
$token = $this->mapper->getToken($this->hashTokenWithEmptySecret($tokenId));
$this->rotate($token, $tokenId, $tokenId);
} catch (DoesNotExistException) {
$this->cacheInvalidHash($tokenHash);
throw new InvalidTokenException("Token does not exist: " . $ex->getMessage(), 0, $ex);
}
}
$this->checkToken($token);
return $token;
}
/**
* @throws InvalidTokenException when token doesn't exist
*/
private function getTokenFromCache(string $tokenHash): ?PublicKeyToken {
$serializedToken = $this->cache->get($tokenHash);
if ($serializedToken === false) {
return null;
}
if ($serializedToken === null) {
return null;
}
$token = unserialize($serializedToken, [
'allowed_classes' => [PublicKeyToken::class],
]);
return $token instanceof PublicKeyToken ? $token : null;
}
private function cacheToken(PublicKeyToken $token): void {
$this->cache->set($token->getToken(), serialize($token), self::TOKEN_CACHE_TTL);
}
private function cacheInvalidHash(string $tokenHash): void {
// Invalid entries can be kept longer in cache since it’s unlikely to reuse them
$this->cache->set($tokenHash, false, self::TOKEN_CACHE_TTL * 2);
}
public function getTokenById(int $tokenId): OCPIToken {
try {
$token = $this->mapper->getTokenById($tokenId);
} catch (DoesNotExistException $ex) {
throw new InvalidTokenException("Token with ID $tokenId does not exist: " . $ex->getMessage(), 0, $ex);
}
$this->checkToken($token);
return $token;
}
private function checkToken($token): void {
if ((int)$token->getExpires() !== 0 && $token->getExpires() < $this->time->getTime()) {
throw new ExpiredTokenException($token);
}
if ($token->getType() === OCPIToken::WIPE_TOKEN) {
throw new WipeTokenException($token);
}
if ($token->getPasswordInvalid() === true) {
//The password is invalid we should throw an TokenPasswordExpiredException
throw new TokenPasswordExpiredException($token);
}
}
public function renewSessionToken(string $oldSessionId, string $sessionId): OCPIToken {
return $this->atomic(function () use ($oldSessionId, $sessionId) {
$token = $this->getToken($oldSessionId);
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException("Invalid token type");
}
$password = null;
if (!is_null($token->getPassword())) {
$privateKey = $this->decrypt($token->getPrivateKey(), $oldSessionId);
$password = $this->decryptPassword($token->getPassword(), $privateKey);
}
$scope = $token->getScope() === '' ? null : $token->getScopeAsArray();
$newToken = $this->generateToken(
$sessionId,
$token->getUID(),
$token->getLoginName(),
$password,
$token->getName(),
OCPIToken::TEMPORARY_TOKEN,
$token->getRemember(),
$scope,
);
$this->cacheToken($newToken);
$this->cacheInvalidHash($token->getToken());
$this->mapper->delete($token);
return $newToken;
}, $this->db);
}
public function invalidateToken(string $token) {
$tokenHash = $this->hashToken($token);
$this->mapper->invalidate($this->hashToken($token));
$this->mapper->invalidate($this->hashTokenWithEmptySecret($token));
$this->cacheInvalidHash($tokenHash);
}
public function invalidateTokenById(string $uid, int $id) {
$token = $this->mapper->getTokenById($id);
if ($token->getUID() !== $uid) {
return;
}
$this->mapper->invalidate($token->getToken());
$this->cacheInvalidHash($token->getToken());
}
public function invalidateOldTokens() {
$olderThan = $this->time->getTime() - $this->config->getSystemValueInt('session_lifetime', 60 * 60 * 24);
$this->logger->debug('Invalidating session tokens older than ' . date('c', $olderThan), ['app' => 'cron']);
$this->mapper->invalidateOld($olderThan, OCPIToken::TEMPORARY_TOKEN, OCPIToken::DO_NOT_REMEMBER);
$rememberThreshold = $this->time->getTime() - $this->config->getSystemValueInt('remember_login_cookie_lifetime', 60 * 60 * 24 * 15);
$this->logger->debug('Invalidating remembered session tokens older than ' . date('c', $rememberThreshold), ['app' => 'cron']);
$this->mapper->invalidateOld($rememberThreshold, OCPIToken::TEMPORARY_TOKEN, OCPIToken::REMEMBER);
$wipeThreshold = $this->time->getTime() - $this->config->getSystemValueInt('token_auth_wipe_token_retention', 60 * 60 * 24 * 60);
$this->logger->debug('Invalidating auth tokens marked for remote wipe older than ' . date('c', $wipeThreshold), ['app' => 'cron']);
$this->mapper->invalidateOld($wipeThreshold, OCPIToken::WIPE_TOKEN);
$authTokenThreshold = $this->time->getTime() - $this->config->getSystemValueInt('token_auth_token_retention', 60 * 60 * 24 * 365);
$this->logger->debug('Invalidating auth tokens older than ' . date('c', $authTokenThreshold), ['app' => 'cron']);
$this->mapper->invalidateOld($authTokenThreshold, OCPIToken::PERMANENT_TOKEN);
}
public function invalidateLastUsedBefore(string $uid, int $before): void {
$this->mapper->invalidateLastUsedBefore($uid, $before);
}
public function updateToken(OCPIToken $token) {
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException("Invalid token type");
}
$this->mapper->update($token);
$this->cacheToken($token);
}
public function updateTokenActivity(OCPIToken $token) {
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException("Invalid token type");
}
$activityInterval = $this->config->getSystemValueInt('token_auth_activity_update', 60);
$activityInterval = min(max($activityInterval, 0), 300);
/** @var PublicKeyToken $token */
$now = $this->time->getTime();
if ($token->getLastActivity() < ($now - $activityInterval)) {
$token->setLastActivity($now);
$this->mapper->updateActivity($token, $now);
$this->cacheToken($token);
}
}
public function getTokenByUser(string $uid): array {
return $this->mapper->getTokenByUser($uid);
}
public function getPassword(OCPIToken $savedToken, string $tokenId): string {
if (!($savedToken instanceof PublicKeyToken)) {
throw new InvalidTokenException("Invalid token type");
}
if ($savedToken->getPassword() === null) {
throw new PasswordlessTokenException();
}
// Decrypt private key with tokenId
$privateKey = $this->decrypt($savedToken->getPrivateKey(), $tokenId);
// Decrypt password with private key
return $this->decryptPassword($savedToken->getPassword(), $privateKey);
}
public function setPassword(OCPIToken $token, string $tokenId, string $password) {
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException("Invalid token type");
}
$this->atomic(function () use ($password, $token) {
// When changing passwords all temp tokens are deleted
$this->mapper->deleteTempToken($token);
// Update the password for all tokens
$tokens = $this->mapper->getTokenByUser($token->getUID());
$hashedPassword = $this->hashPassword($password);
foreach ($tokens as $t) {
$publicKey = $t->getPublicKey();
$t->setPassword($this->encryptPassword($password, $publicKey));
$t->setPasswordHash($hashedPassword);
$this->updateToken($t);
}
}, $this->db);
}
private function hashPassword(string $password): string {
return $this->hasher->hash(sha1($password) . $password);
}
public function rotate(OCPIToken $token, string $oldTokenId, string $newTokenId): OCPIToken {
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException("Invalid token type");
}
// Decrypt private key with oldTokenId
$privateKey = $this->decrypt($token->getPrivateKey(), $oldTokenId);
// Encrypt with the new token
$token->setPrivateKey($this->encrypt($privateKey, $newTokenId));
$token->setToken($this->hashToken($newTokenId));
$this->updateToken($token);
return $token;
}
private function encrypt(string $plaintext, string $token): string {
$secret = $this->config->getSystemValueString('secret');
return $this->crypto->encrypt($plaintext, $token . $secret);
}
/**
* @throws InvalidTokenException
*/
private function decrypt(string $cipherText, string $token): string {
$secret = $this->config->getSystemValueString('secret');
try {
return $this->crypto->decrypt($cipherText, $token . $secret);
} catch (\Exception $ex) {
// Retry with empty secret as a fallback for instances where the secret might not have been set by accident
try {
return $this->crypto->decrypt($cipherText, $token);
} catch (\Exception $ex2) {
// Delete the invalid token
$this->invalidateToken($token);
throw new InvalidTokenException("Could not decrypt token password: " . $ex->getMessage(), 0, $ex2);
}
}
}
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;
}
private function hashToken(string $token): string {
$secret = $this->config->getSystemValueString('secret');
return hash('sha512', $token . $secret);
}
/**
* @deprecated Fallback for instances where the secret might not have been set by accident
*/
private function hashTokenWithEmptySecret(string $token): string {
return hash('sha512', $token);
}
/**
* @throws \RuntimeException when OpenSSL reports a problem
*/
private function newToken(string $token,
string $uid,
string $loginName,
$password,
string $name,
int $type,
int $remember): PublicKeyToken {
$dbToken = new PublicKeyToken();
$dbToken->setUid($uid);
$dbToken->setLoginName($loginName);
$config = array_merge([
'digest_alg' => 'sha512',
'private_key_bits' => $password !== null && strlen($password) > 250 ? 4096 : 2048,
], $this->config->getSystemValue('openssl', []));
// 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'];
$dbToken->setPublicKey($publicKey);
$dbToken->setPrivateKey($this->encrypt($privateKey, $token));
if (!is_null($password) && $this->config->getSystemValueBool('auth.storeCryptedPassword', true)) {
if (strlen($password) > IUserManager::MAX_PASSWORD_LENGTH) {
throw new \RuntimeException('Trying to save a password with more than 469 characters is not supported. If you want to use big passwords, disable the auth.storeCryptedPassword option in config.php');
}
$dbToken->setPassword($this->encryptPassword($password, $publicKey));
$dbToken->setPasswordHash($this->hashPassword($password));
}
$dbToken->setName($name);
$dbToken->setToken($this->hashToken($token));
$dbToken->setType($type);
$dbToken->setRemember($remember);
$dbToken->setLastActivity($this->time->getTime());
$dbToken->setLastCheck($this->time->getTime());
$dbToken->setVersion(PublicKeyToken::VERSION);
return $dbToken;
}
public function markPasswordInvalid(OCPIToken $token, string $tokenId) {
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException("Invalid token type");
}
$token->setPasswordInvalid(true);
$this->mapper->update($token);
$this->cacheToken($token);
}
public function updatePasswords(string $uid, string $password) {
// prevent setting an empty pw as result of pw-less-login
if ($password === '' || !$this->config->getSystemValueBool('auth.storeCryptedPassword', true)) {
return;
}
$this->atomic(function () use ($password, $uid) {
// Update the password for all tokens
$tokens = $this->mapper->getTokenByUser($uid);
$newPasswordHash = null;
/**
* - true: The password hash could not be verified anymore
* and the token needs to be updated with the newly encrypted password
* - false: The hash could still be verified
* - missing: The hash needs to be verified
*/
$hashNeedsUpdate = [];
foreach ($tokens as $t) {
if (!isset($hashNeedsUpdate[$t->getPasswordHash()])) {
if ($t->getPasswordHash() === null) {
$hashNeedsUpdate[$t->getPasswordHash() ?: ''] = true;
} elseif (!$this->hasher->verify(sha1($password) . $password, $t->getPasswordHash())) {
$hashNeedsUpdate[$t->getPasswordHash() ?: ''] = true;
} else {
$hashNeedsUpdate[$t->getPasswordHash() ?: ''] = false;
}
}
$needsUpdating = $hashNeedsUpdate[$t->getPasswordHash() ?: ''] ?? true;
if ($needsUpdating) {
if ($newPasswordHash === null) {
$newPasswordHash = $this->hashPassword($password);
}
$publicKey = $t->getPublicKey();
$t->setPassword($this->encryptPassword($password, $publicKey));
$t->setPasswordHash($newPasswordHash);
$t->setPasswordInvalid(false);
$this->updateToken($t);
}
}
// If password hashes are different we update them all to be equal so
// that the next execution only needs to verify once
if (count($hashNeedsUpdate) > 1) {
$newPasswordHash = $this->hashPassword($password);
$this->mapper->updateHashesForUser($uid, $newPasswordHash);
}
}, $this->db);
}
private function logOpensslError() {
$errors = [];
while ($error = openssl_error_string()) {
$errors[] = $error;
}
$this->logger->critical('Something is wrong with your openssl setup: ' . implode(', ', $errors));
}
}
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