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<?php |
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/** |
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* Helper for cron tasks. |
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* |
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* @package ThreemaGateway |
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* @author rugk |
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* @copyright Copyright (c) 2016 rugk |
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* @license MIT |
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*/ |
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class ThreemaGateway_Helper_Message |
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{ |
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/** |
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* Checks whether a message is at risk of an replay attack. |
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* |
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* If the message is not at risk, it is usually just too old, so |
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* that date checking mechanisms would prevent it to be delivered. |
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* |
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* @param array $messageMetaData the message data including, at least, the |
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* meta data. |
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* |
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* @return bool |
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*/ |
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public static function isAtRiskOfReplayAttack(array $messageMetaData) |
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{ |
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// in case the time is no valid/positive number, better return true |
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if (!$messageMetaData['date_received']) { |
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return true; |
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} |
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/* @var XenForo_Options $options */ |
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$xenOptions = XenForo_Application::getOptions(); |
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// when the hardened mode is activated, always return true |
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if ($xenOptions->threema_gateway_harden_reply_attack_protection) { |
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return true; |
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} |
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// if message has not been send at least 2 weeks ago (by default), it is attackable |
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if ($messageMetaData['date_received'] >= self::getOldestPossibleReplayAttackDate()) { |
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return true; |
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} |
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// older messages are fine |
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return false; |
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} |
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/** |
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* Returns the date/time where a message would still be accepted although |
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* it is outdated. |
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* |
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* Note that for doing the actual replay attack check, this method *must not* |
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* be used, but the option should rather be used directly. |
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* |
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* @return int |
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*/ |
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public static function getOldestPossibleReplayAttackDate() |
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{ |
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/** @var XenForo_Options $options */ |
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$options = XenForo_Application::getOptions(); |
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/* @var int $rejectOldDefault the maximum age of a message as hardcoded/predefined fallback */ |
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$rejectOldDefault = strtotime('-14 days', XenForo_Application::$time); |
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/* @var int $rejectOldOption the maximum age of a message according to the options */ |
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$rejectOldOption = $rejectOldDefault; |
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if ($options->threema_gateway_verify_receive_time && |
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$options->threema_gateway_verify_receive_time['enabled'] |
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) { |
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$rejectOldOption = strtotime($options->threema_gateway_verify_receive_time['time'], XenForo_Application::$time); |
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} |
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return min($rejectOldDefault, $rejectOldOption); |
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} |
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} |
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rugk /
xenforo-threema-gateway
