nextcloud/lib/private/Authentication/Token/PublicKeyTokenProvider.php

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<?php
declare(strict_types=1);
/**
* @copyright Copyright 2018, Roeland Jago Douma <roeland@famdouma.nl>
*
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\Authentication\Token;
use OC\Authentication\Exceptions\ExpiredTokenException;
use OC\Authentication\Exceptions\InvalidTokenException;
use OC\Authentication\Exceptions\PasswordlessTokenException;
use OC\Authentication\Exceptions\WipeTokenException;
use OC\Cache\CappedMemoryCache;
use OCP\AppFramework\Db\DoesNotExistException;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IConfig;
use OCP\ILogger;
use OCP\Security\ICrypto;
class PublicKeyTokenProvider implements IProvider {
/** @var PublicKeyTokenMapper */
private $mapper;
/** @var ICrypto */
private $crypto;
/** @var IConfig */
private $config;
/** @var ILogger $logger */
private $logger;
/** @var ITimeFactory $time */
private $time;
/** @var CappedMemoryCache */
private $cache;
public function __construct(PublicKeyTokenMapper $mapper,
ICrypto $crypto,
IConfig $config,
ILogger $logger,
ITimeFactory $time) {
$this->mapper = $mapper;
$this->crypto = $crypto;
$this->config = $config;
$this->logger = $logger;
$this->time = $time;
$this->cache = new CappedMemoryCache();
}
/**
* {@inheritDoc}
*/
public function generateToken(string $token,
string $uid,
string $loginName,
$password,
string $name,
int $type = IToken::TEMPORARY_TOKEN,
int $remember = IToken::DO_NOT_REMEMBER): IToken {
$dbToken = $this->newToken($token, $uid, $loginName, $password, $name, $type, $remember);
$this->mapper->insert($dbToken);
// Add the token to the cache
$this->cache[$dbToken->getToken()] = $dbToken;
return $dbToken;
}
public function getToken(string $tokenId): IToken {
$tokenHash = $this->hashToken($tokenId);
if (isset($this->cache[$tokenHash])) {
$token = $this->cache[$tokenHash];
} else {
try {
$token = $this->mapper->getToken($this->hashToken($tokenId));
$this->cache[$token->getToken()] = $token;
} catch (DoesNotExistException $ex) {
throw new InvalidTokenException();
}
}
if ((int)$token->getExpires() !== 0 && $token->getExpires() < $this->time->getTime()) {
throw new ExpiredTokenException($token);
}
if ($token->getType() === IToken::WIPE_TOKEN) {
throw new WipeTokenException($token);
}
return $token;
}
public function getTokenById(int $tokenId): IToken {
try {
$token = $this->mapper->getTokenById($tokenId);
} catch (DoesNotExistException $ex) {
throw new InvalidTokenException();
}
if ((int)$token->getExpires() !== 0 && $token->getExpires() < $this->time->getTime()) {
throw new ExpiredTokenException($token);
}
if ($token->getType() === IToken::WIPE_TOKEN) {
throw new WipeTokenException($token);
}
return $token;
}
public function renewSessionToken(string $oldSessionId, string $sessionId): IToken {
$this->cache->clear();
$token = $this->getToken($oldSessionId);
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException();
}
$password = null;
if (!is_null($token->getPassword())) {
$privateKey = $this->decrypt($token->getPrivateKey(), $oldSessionId);
$password = $this->decryptPassword($token->getPassword(), $privateKey);
}
$newToken = $this->generateToken(
$sessionId,
$token->getUID(),
$token->getLoginName(),
$password,
$token->getName(),
IToken::TEMPORARY_TOKEN,
$token->getRemember()
);
$this->mapper->delete($token);
return $newToken;
}
public function invalidateToken(string $token) {
$this->cache->clear();
$this->mapper->invalidate($this->hashToken($token));
}
public function invalidateTokenById(string $uid, int $id) {
$this->cache->clear();
$this->mapper->deleteById($uid, $id);
}
public function invalidateOldTokens() {
$this->cache->clear();
$olderThan = $this->time->getTime() - (int) $this->config->getSystemValue('session_lifetime', 60 * 60 * 24);
$this->logger->debug('Invalidating session tokens older than ' . date('c', $olderThan), ['app' => 'cron']);
$this->mapper->invalidateOld($olderThan, IToken::DO_NOT_REMEMBER);
$rememberThreshold = $this->time->getTime() - (int) $this->config->getSystemValue('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, IToken::REMEMBER);
}
public function updateToken(IToken $token) {
$this->cache->clear();
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException();
}
$this->mapper->update($token);
}
public function updateTokenActivity(IToken $token) {
$this->cache->clear();
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException();
}
/** @var DefaultToken $token */
$now = $this->time->getTime();
if ($token->getLastActivity() < ($now - 60)) {
// Update token only once per minute
$token->setLastActivity($now);
$this->mapper->update($token);
}
}
public function getTokenByUser(string $uid): array {
return $this->mapper->getTokenByUser($uid);
}
public function getPassword(IToken $token, string $tokenId): string {
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException();
}
if ($token->getPassword() === null) {
throw new PasswordlessTokenException();
}
// Decrypt private key with tokenId
$privateKey = $this->decrypt($token->getPrivateKey(), $tokenId);
// Decrypt password with private key
return $this->decryptPassword($token->getPassword(), $privateKey);
}
public function setPassword(IToken $token, string $tokenId, string $password) {
$this->cache->clear();
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException();
}
// When changing passwords all temp tokens are deleted
$this->mapper->deleteTempToken($token);
// Update the password for all tokens
$tokens = $this->mapper->getTokenByUser($token->getUID());
foreach ($tokens as $t) {
$publicKey = $t->getPublicKey();
$t->setPassword($this->encryptPassword($password, $publicKey));
$this->updateToken($t);
}
}
public function rotate(IToken $token, string $oldTokenId, string $newTokenId): IToken {
$this->cache->clear();
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException();
}
// 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->getSystemValue('secret');
return $this->crypto->encrypt($plaintext, $token . $secret);
}
/**
* @throws InvalidTokenException
*/
private function decrypt(string $cipherText, string $token): string {
$secret = $this->config->getSystemValue('secret');
try {
return $this->crypto->decrypt($cipherText, $token . $secret);
} catch (\Exception $ex) {
// Delete the invalid token
$this->invalidateToken($token);
throw new InvalidTokenException();
}
}
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->getSystemValue('secret');
return hash('sha512', $token . $secret);
}
/**
* Convert a DefaultToken to a publicKeyToken
* This will also be updated directly in the Database
* @throws \RuntimeException when OpenSSL reports a problem
*/
public function convertToken(DefaultToken $defaultToken, string $token, $password): PublicKeyToken {
$this->cache->clear();
$pkToken = $this->newToken(
$token,
$defaultToken->getUID(),
$defaultToken->getLoginName(),
$password,
$defaultToken->getName(),
$defaultToken->getType(),
$defaultToken->getRemember()
);
$pkToken->setExpires($defaultToken->getExpires());
$pkToken->setId($defaultToken->getId());
return $this->mapper->update($pkToken);
}
/**
* @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' => 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)) {
$dbToken->setPassword($this->encryptPassword($password, $publicKey));
}
$dbToken->setName($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(IToken $token, string $tokenId) {
$this->cache->clear();
if (!($token instanceof PublicKeyToken)) {
throw new InvalidTokenException();
}
$token->setPasswordInvalid(true);
$this->mapper->update($token);
}
public function updatePasswords(string $uid, string $password) {
$this->cache->clear();
if (!$this->mapper->hasExpiredTokens($uid)) {
// Nothing to do here
return;
}
// Update the password for all tokens
$tokens = $this->mapper->getTokenByUser($uid);
foreach ($tokens as $t) {
$publicKey = $t->getPublicKey();
$t->setPassword($this->encryptPassword($password, $publicKey));
$this->updateToken($t);
}
}
private function logOpensslError() {
$errors = [];
while ($error = openssl_error_string()) {
$errors[] = $error;
}
$this->logger->critical('Something is wrong with your openssl setup: ' . implode(', ', $errors));
}
}