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<?php
/**
* @copyright Copyright (c) 2018 Robin Appelman <robin@icewind.nl>
*
* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Joas Schilling <coding@schilljs.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Vincent Petry <vincent@nextcloud.com>
*
* @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\Log;
use OC\Core\Controller\SetupController;
use OC\HintException;
use OC\Security\IdentityProof\Key;
use OC\Setup;
use OC\SystemConfig;
class ExceptionSerializer {
public const methodsWithSensitiveParameters = [
// Session/User
'completeLogin',
'login',
'checkPassword',
'checkPasswordNoLogging',
'loginWithPassword',
'updatePrivateKeyPassword',
'validateUserPass',
'loginWithToken',
'{closure}',
'createSessionToken',
// Provisioning
'addUser',
// TokenProvider
'getToken',
'isTokenPassword',
'getPassword',
'decryptPassword',
'logClientIn',
'generateToken',
'validateToken',
// TwoFactorAuth
'solveChallenge',
'verifyChallenge',
// ICrypto
'calculateHMAC',
'encrypt',
'decrypt',
// LoginController
'tryLogin',
'confirmPassword',
// LDAP
'bind',
'areCredentialsValid',
'invokeLDAPMethod',
// Encryption
'storeKeyPair',
'setupUser',
'checkSignature',
// files_external: OCA\Files_External\MountConfig
'getBackendStatus',
// files_external: UserStoragesController
'update',
// Preview providers, don't log big data strings
'imagecreatefromstring',
];
/** @var SystemConfig */
private $systemConfig;
public function __construct(SystemConfig $systemConfig) {
$this->systemConfig = $systemConfig;
}
public const methodsWithSensitiveParametersByClass = [
SetupController::class => [
'run',
'display',
'loadAutoConfig',
],
Setup::class => [
'install'
],
Key::class => [
'__construct'
],
];
private function editTrace(array &$sensitiveValues, array $traceLine): array {
if (isset($traceLine['args'])) {
$sensitiveValues = array_merge($sensitiveValues, $traceLine['args']);
}
$traceLine['args'] = ['*** sensitive parameters replaced ***'];
return $traceLine;
}
private function filterTrace(array $trace) {
$sensitiveValues = [];
$trace = array_map(function (array $traceLine) use (&$sensitiveValues) {
$className = $traceLine['class'] ?? '';
if ($className && isset(self::methodsWithSensitiveParametersByClass[$className])
&& in_array($traceLine['function'], self::methodsWithSensitiveParametersByClass[$className], true)) {
return $this->editTrace($sensitiveValues, $traceLine);
}
foreach (self::methodsWithSensitiveParameters as $sensitiveMethod) {
if (strpos($traceLine['function'], $sensitiveMethod) !== false) {
return $this->editTrace($sensitiveValues, $traceLine);
}
}
return $traceLine;
}, $trace);
return array_map(function (array $traceLine) use ($sensitiveValues) {
if (isset($traceLine['args'])) {
$traceLine['args'] = $this->removeValuesFromArgs($traceLine['args'], $sensitiveValues);
}
return $traceLine;
}, $trace);
}
private function removeValuesFromArgs($args, $values) {
foreach ($args as &$arg) {
if (in_array($arg, $values, true)) {
$arg = '*** sensitive parameter replaced ***';
} elseif (is_array($arg)) {
$arg = $this->removeValuesFromArgs($arg, $values);
}
}
return $args;
}
private function encodeTrace($trace) {
$filteredTrace = $this->filterTrace($trace);
return array_map(function (array $line) {
if (isset($line['args'])) {
$line['args'] = array_map([$this, 'encodeArg'], $line['args']);
}
return $line;
}, $filteredTrace);
}
private function encodeArg($arg) {
if (is_object($arg)) {
$data = get_object_vars($arg);
$data['__class__'] = get_class($arg);
return array_map([$this, 'encodeArg'], $data);
}
if (is_array($arg)) {
// Only log the first 5 elements of an array unless we are on debug
if ((int)$this->systemConfig->getValue('loglevel', 2) !== 0) {
$elemCount = count($arg);
if ($elemCount > 5) {
$arg = array_slice($arg, 0, 5);
$arg[] = 'And ' . ($elemCount - 5) . ' more entries, set log level to debug to see all entries';
}
}
return array_map([$this, 'encodeArg'], $arg);
}
return $arg;
}
public function serializeException(\Throwable $exception) {
$data = [
'Exception' => get_class($exception),
'Message' => $exception->getMessage(),
'Code' => $exception->getCode(),
'Trace' => $this->encodeTrace($exception->getTrace()),
'File' => $exception->getFile(),
'Line' => $exception->getLine(),
];
if ($exception instanceof HintException) {
$data['Hint'] = $exception->getHint();
}
if ($exception->getPrevious()) {
$data['Previous'] = $this->serializeException($exception->getPrevious());
}
return $data;
}
}
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