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-rw-r--r--lib/base.php2
-rw-r--r--lib/private/AppFramework/DependencyInjection/DIContainer.php3
-rw-r--r--lib/private/AppFramework/Middleware/Security/CORSMiddleware.php25
-rw-r--r--lib/private/Security/Bruteforce/Throttler.php230
-rw-r--r--lib/private/Server.php16
-rw-r--r--lib/private/User/Session.php26
-rw-r--r--lib/private/legacy/api.php2
7 files changed, 282 insertions, 22 deletions
diff --git a/lib/base.php b/lib/base.php
index afa13cd1047..b2ac0bab7d8 100644
--- a/lib/base.php
+++ b/lib/base.php
@@ -993,7 +993,7 @@ class OC {
if ($userSession->tryTokenLogin($request)) {
return true;
}
- if ($userSession->tryBasicAuthLogin($request)) {
+ if ($userSession->tryBasicAuthLogin($request, \OC::$server->getBruteForceThrottler())) {
return true;
}
return false;
diff --git a/lib/private/AppFramework/DependencyInjection/DIContainer.php b/lib/private/AppFramework/DependencyInjection/DIContainer.php
index 32a85606abf..893d6cb9aa6 100644
--- a/lib/private/AppFramework/DependencyInjection/DIContainer.php
+++ b/lib/private/AppFramework/DependencyInjection/DIContainer.php
@@ -352,7 +352,8 @@ class DIContainer extends SimpleContainer implements IAppContainer {
return new CORSMiddleware(
$c['Request'],
$c['ControllerMethodReflector'],
- $c['OCP\IUserSession']
+ $c['OCP\IUserSession'],
+ $c->getServer()->getBruteForceThrottler()
);
});
diff --git a/lib/private/AppFramework/Middleware/Security/CORSMiddleware.php b/lib/private/AppFramework/Middleware/Security/CORSMiddleware.php
index 32a507623e3..04de4bc92d3 100644
--- a/lib/private/AppFramework/Middleware/Security/CORSMiddleware.php
+++ b/lib/private/AppFramework/Middleware/Security/CORSMiddleware.php
@@ -27,6 +27,7 @@ namespace OC\AppFramework\Middleware\Security;
use OC\AppFramework\Middleware\Security\Exceptions\SecurityException;
use OC\AppFramework\Utility\ControllerMethodReflector;
use OC\Authentication\Exceptions\PasswordLoginForbiddenException;
+use OC\Security\Bruteforce\Throttler;
use OC\User\Session;
use OCP\AppFramework\Controller;
use OCP\AppFramework\Http;
@@ -42,33 +43,29 @@ use OCP\IRequest;
* https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS
*/
class CORSMiddleware extends Middleware {
-
- /**
- * @var IRequest
- */
+ /** @var IRequest */
private $request;
-
- /**
- * @var ControllerMethodReflector
- */
+ /** @var ControllerMethodReflector */
private $reflector;
-
- /**
- * @var Session
- */
+ /** @var Session */
private $session;
+ /** @var Throttler */
+ private $throttler;
/**
* @param IRequest $request
* @param ControllerMethodReflector $reflector
* @param Session $session
+ * @param Throttler $throttler
*/
public function __construct(IRequest $request,
ControllerMethodReflector $reflector,
- Session $session) {
+ Session $session,
+ Throttler $throttler) {
$this->request = $request;
$this->reflector = $reflector;
$this->session = $session;
+ $this->throttler = $throttler;
}
/**
@@ -91,7 +88,7 @@ class CORSMiddleware extends Middleware {
$this->session->logout();
try {
- if (!$this->session->logClientIn($user, $pass, $this->request)) {
+ if (!$this->session->logClientIn($user, $pass, $this->request, $this->throttler)) {
throw new SecurityException('CORS requires basic auth', Http::STATUS_UNAUTHORIZED);
}
} catch (PasswordLoginForbiddenException $ex) {
diff --git a/lib/private/Security/Bruteforce/Throttler.php b/lib/private/Security/Bruteforce/Throttler.php
new file mode 100644
index 00000000000..0de7677285b
--- /dev/null
+++ b/lib/private/Security/Bruteforce/Throttler.php
@@ -0,0 +1,230 @@
+<?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\Bruteforce;
+
+use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\IConfig;
+use OCP\IDBConnection;
+use OCP\ILogger;
+
+/**
+ * Class Throttler implements the bruteforce protection for security actions in
+ * Nextcloud.
+ *
+ * It is working by logging invalid login attempts to the database and slowing
+ * down all login attempts from the same subnet. The max delay is 30 seconds and
+ * the starting delay are 200 milliseconds. (after the first failed login)
+ *
+ * This is based on Paragonie's AirBrake for Airship CMS. You can find the original
+ * code at https://github.com/paragonie/airship/blob/7e5bad7e3c0fbbf324c11f963fd1f80e59762606/src/Engine/Security/AirBrake.php
+ *
+ * @package OC\Security\Bruteforce
+ */
+class Throttler {
+ const LOGIN_ACTION = 'login';
+
+ /** @var IDBConnection */
+ private $db;
+ /** @var ITimeFactory */
+ private $timeFactory;
+ /** @var ILogger */
+ private $logger;
+ /** @var IConfig */
+ private $config;
+
+ /**
+ * @param IDBConnection $db
+ * @param ITimeFactory $timeFactory
+ * @param ILogger $logger
+ * @param IConfig $config
+ */
+ public function __construct(IDBConnection $db,
+ ITimeFactory $timeFactory,
+ ILogger $logger,
+ IConfig $config) {
+ $this->db = $db;
+ $this->timeFactory = $timeFactory;
+ $this->logger = $logger;
+ $this->config = $config;
+ }
+
+ /**
+ * Convert a number of seconds into the appropriate DateInterval
+ *
+ * @param int $expire
+ * @return \DateInterval
+ */
+ private function getCutoff($expire) {
+ $d1 = new \DateTime();
+ $d2 = clone $d1;
+ $d2->sub(new \DateInterval('PT' . $expire . 'S'));
+ return $d2->diff($d1);
+ }
+
+ /**
+ * Return the given subnet for an IPv4 address and mask bits
+ *
+ * @param string $ip
+ * @param int $maskBits
+ * @return string
+ */
+ private function getIPv4Subnet($ip,
+ $maskBits = 32) {
+ $binary = \inet_pton($ip);
+ for ($i = 32; $i > $maskBits; $i -= 8) {
+ $j = \intdiv($i, 8) - 1;
+ $k = (int) \min(8, $i - $maskBits);
+ $mask = (0xff - ((pow(2, $k)) - 1));
+ $int = \unpack('C', $binary[$j]);
+ $binary[$j] = \pack('C', $int[1] & $mask);
+ }
+ return \inet_ntop($binary).'/'.$maskBits;
+ }
+
+ /**
+ * Return the given subnet for an IPv6 address and mask bits
+ *
+ * @param string $ip
+ * @param int $maskBits
+ * @return string
+ */
+ private function getIPv6Subnet($ip, $maskBits = 48) {
+ $binary = \inet_pton($ip);
+ for ($i = 128; $i > $maskBits; $i -= 8) {
+ $j = \intdiv($i, 8) - 1;
+ $k = (int) \min(8, $i - $maskBits);
+ $mask = (0xff - ((pow(2, $k)) - 1));
+ $int = \unpack('C', $binary[$j]);
+ $binary[$j] = \pack('C', $int[1] & $mask);
+ }
+ return \inet_ntop($binary).'/'.$maskBits;
+ }
+
+ /**
+ * Return the given subnet for an IP and the configured mask bits
+ *
+ * Determine if the IP is an IPv4 or IPv6 address, then pass to the correct
+ * method for handling that specific type.
+ *
+ * @param string $ip
+ * @return string
+ */
+ private function getSubnet($ip) {
+ if (\preg_match('/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/', $ip)) {
+ return $this->getIPv4Subnet(
+ $ip,
+ 32
+ );
+ }
+ return $this->getIPv6Subnet(
+ $ip,
+ 128
+ );
+ }
+
+ /**
+ * Register a failed attempt to bruteforce a security control
+ *
+ * @param string $action
+ * @param string $ip
+ * @param array $metadata Optional metadata logged to the database
+ */
+ public function registerAttempt($action,
+ $ip,
+ array $metadata = []) {
+ // No need to log if the bruteforce protection is disabled
+ if($this->config->getSystemValue('auth.bruteforce.protection.enabled', true) === false) {
+ return;
+ }
+
+ $values = [
+ 'action' => $action,
+ 'occurred' => $this->timeFactory->getTime(),
+ 'ip' => $ip,
+ 'subnet' => $this->getSubnet($ip),
+ 'metadata' => json_encode($metadata),
+ ];
+
+ $this->logger->notice(
+ sprintf(
+ 'Bruteforce attempt from "%s" detected for action "%s".',
+ $ip,
+ $action
+ ),
+ [
+ 'app' => 'core',
+ ]
+ );
+
+ $qb = $this->db->getQueryBuilder();
+ $qb->insert('bruteforce_attempts');
+ foreach($values as $column => $value) {
+ $qb->setValue($column, $qb->createNamedParameter($value));
+ }
+ $qb->execute();
+ }
+
+ /**
+ * Get the throttling delay (in milliseconds)
+ *
+ * @param string $ip
+ * @return int
+ */
+ public function getDelay($ip) {
+ $cutoffTime = (new \DateTime())
+ ->sub($this->getCutoff(43200))
+ ->getTimestamp();
+
+ $qb = $this->db->getQueryBuilder();
+ $qb->select('*')
+ ->from('bruteforce_attempts')
+ ->where($qb->expr()->gt('occurred', $qb->createNamedParameter($cutoffTime)))
+ ->andWhere($qb->expr()->eq('subnet', $qb->createNamedParameter($this->getSubnet($ip))));
+ $attempts = count($qb->execute()->fetchAll());
+
+ if ($attempts === 0) {
+ return 0;
+ }
+
+ $maxDelay = 30;
+ $firstDelay = 0.1;
+ if ($attempts > (8 * PHP_INT_SIZE - 1)) {
+ // Don't ever overflow. Just assume the maxDelay time:s
+ $firstDelay = $maxDelay;
+ } else {
+ $firstDelay *= pow(2, $attempts);
+ if ($firstDelay > $maxDelay) {
+ $firstDelay = $maxDelay;
+ }
+ }
+ return (int) \ceil($firstDelay * 1000);
+ }
+
+ /**
+ * Will sleep for the defined amount of time
+ *
+ * @param string $ip
+ */
+ public function sleepDelay($ip) {
+ usleep($this->getDelay($ip) * 1000);
+ }
+}
diff --git a/lib/private/Server.php b/lib/private/Server.php
index eb2c26415bc..6ffdeb9211e 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -66,6 +66,7 @@ use OC\Lock\NoopLockingProvider;
use OC\Mail\Mailer;
use OC\Memcache\ArrayCache;
use OC\Notification\Manager;
+use OC\Security\Bruteforce\Throttler;
use OC\Security\CertificateManager;
use OC\Security\CSP\ContentSecurityPolicyManager;
use OC\Security\Crypto;
@@ -503,6 +504,14 @@ class Server extends ServerContainer implements IServerContainer {
$this->registerService('TrustedDomainHelper', function ($c) {
return new TrustedDomainHelper($this->getConfig());
});
+ $this->registerService('Throttler', function(Server $c) {
+ return new Throttler(
+ $c->getDatabaseConnection(),
+ new TimeFactory(),
+ $c->getLogger(),
+ $c->getConfig()
+ );
+ });
$this->registerService('IntegrityCodeChecker', function (Server $c) {
// IConfig and IAppManager requires a working database. This code
// might however be called when ownCloud is not yet setup.
@@ -1331,6 +1340,13 @@ class Server extends ServerContainer implements IServerContainer {
}
/**
+ * @return Throttler
+ */
+ public function getBruteForceThrottler() {
+ return $this->query('Throttler');
+ }
+
+ /**
* @return IContentSecurityPolicyManager
*/
public function getContentSecurityPolicyManager() {
diff --git a/lib/private/User/Session.php b/lib/private/User/Session.php
index dcc2e66c6c3..8d12982dd1a 100644
--- a/lib/private/User/Session.php
+++ b/lib/private/User/Session.php
@@ -95,7 +95,11 @@ class Session implements IUserSession, Emitter {
* @param IProvider $tokenProvider
* @param IConfig $config
*/
- public function __construct(IUserManager $manager, ISession $session, ITimeFactory $timeFacory, $tokenProvider, IConfig $config) {
+ public function __construct(IUserManager $manager,
+ ISession $session,
+ ITimeFactory $timeFacory,
+ $tokenProvider,
+ IConfig $config) {
$this->manager = $manager;
$this->session = $session;
$this->timeFacory = $timeFacory;
@@ -280,7 +284,6 @@ class Session implements IUserSession, Emitter {
*/
public function login($uid, $password) {
$this->session->regenerateId();
-
if ($this->validateToken($password, $uid)) {
return $this->loginWithToken($password);
} else {
@@ -298,11 +301,18 @@ class Session implements IUserSession, Emitter {
* @param string $user
* @param string $password
* @param IRequest $request
+ * @param OC\Security\Bruteforce\Throttler $throttler
* @throws LoginException
* @throws PasswordLoginForbiddenException
* @return boolean
*/
- public function logClientIn($user, $password, IRequest $request) {
+ public function logClientIn($user,
+ $password,
+ IRequest $request,
+ OC\Security\Bruteforce\Throttler $throttler) {
+ $currentDelay = $throttler->getDelay($request->getRemoteAddress());
+ $throttler->sleepDelay($request->getRemoteAddress());
+
$isTokenPassword = $this->isTokenPassword($password);
if (!$isTokenPassword && $this->isTokenAuthEnforced()) {
throw new PasswordLoginForbiddenException();
@@ -315,6 +325,11 @@ class Session implements IUserSession, Emitter {
if (count($users) === 1) {
return $this->login($users[0]->getUID(), $password);
}
+
+ $throttler->registerAttempt('login', $request->getRemoteAddress(), ['uid' => $user]);
+ if($currentDelay === 0) {
+ $throttler->sleepDelay($request->getRemoteAddress());
+ }
return false;
}
@@ -391,10 +406,11 @@ class Session implements IUserSession, Emitter {
* @param IRequest $request
* @return boolean if the login was successful
*/
- public function tryBasicAuthLogin(IRequest $request) {
+ public function tryBasicAuthLogin(IRequest $request,
+ OC\Security\Bruteforce\Throttler $throttler) {
if (!empty($request->server['PHP_AUTH_USER']) && !empty($request->server['PHP_AUTH_PW'])) {
try {
- if ($this->logClientIn($request->server['PHP_AUTH_USER'], $request->server['PHP_AUTH_PW'], $request)) {
+ if ($this->logClientIn($request->server['PHP_AUTH_USER'], $request->server['PHP_AUTH_PW'], $request, $throttler)) {
/**
* Add DAV authenticated. This should in an ideal world not be
* necessary but the iOS App reads cookies from anywhere instead
diff --git a/lib/private/legacy/api.php b/lib/private/legacy/api.php
index 024f3c0fb63..88eb7b09a78 100644
--- a/lib/private/legacy/api.php
+++ b/lib/private/legacy/api.php
@@ -364,7 +364,7 @@ class OC_API {
try {
$loginSuccess = $userSession->tryTokenLogin($request);
if (!$loginSuccess) {
- $loginSuccess = $userSession->tryBasicAuthLogin($request);
+ $loginSuccess = $userSession->tryBasicAuthLogin($request, \OC::$server->getBruteForceThrottler());
}
} catch (\OC\User\LoginException $e) {
return false;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 04:39:55 +0000