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<?php |
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/* |
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* This file is part of the Shieldon package. |
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* |
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* (c) Terry L. <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Shieldon\Firewall\Kernel; |
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use function file_exists; |
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use function file_put_contents; |
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use function filter_var; |
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use function is_writable; |
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use function time; |
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/* |
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* @since 1.0.0 |
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*/ |
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trait RuleTrait |
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{ |
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/** |
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* Look up the rule table. |
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* |
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* If a specific IP address doesn't exist, return false. |
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* Otherwise, return true. |
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* |
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* @return bool |
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*/ |
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private function DoesRuleExist() |
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{ |
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$ipRule = $this->driver->get($this->ip, 'rule'); |
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if (empty($ipRule)) { |
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return false; |
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} |
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$ruleType = (int) $ipRule['type']; |
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// Apply the status code. |
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$this->result = $ruleType; |
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if ($ruleType === self::ACTION_ALLOW) { |
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return true; |
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} |
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// Current visitor has been blocked. If he still attempts accessing the site, |
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// then we can drop him into the permanent block list. |
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$attempts = $ipRule['attempts'] ?? 0; |
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$attempts = (int) $attempts; |
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$now = time(); |
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$logData = []; |
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$handleType = 0; |
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$logData['log_ip'] = $ipRule['log_ip']; |
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$logData['ip_resolve'] = $ipRule['ip_resolve']; |
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$logData['time'] = $now; |
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$logData['type'] = $ipRule['type']; |
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$logData['reason'] = $ipRule['reason']; |
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$logData['attempts'] = $attempts; |
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// @since 0.2.0 |
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$attemptPeriod = $this->properties['record_attempt_detection_period']; |
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$attemptReset = $this->properties['reset_attempt_counter']; |
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$lastTimeDiff = $now - $ipRule['time']; |
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if ($lastTimeDiff <= $attemptPeriod) { |
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$logData['attempts'] = ++$attempts; |
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} |
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if ($lastTimeDiff > $attemptReset) { |
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$logData['attempts'] = 0; |
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} |
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if ($ruleType === self::ACTION_TEMPORARILY_DENY) { |
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$ratd = $this->determineAttemptsTemporaryDeny($logData, $handleType, $attempts); |
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$logData = $ratd['log_data']; |
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$handleType = $ratd['handle_type']; |
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} |
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if ($ruleType === self::ACTION_DENY) { |
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$rapd = $this->determineAttemptsPermanentDeny($logData, $handleType, $attempts); |
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$logData = $rapd['log_data']; |
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$handleType = $rapd['handle_type']; |
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} |
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// We only update data when `deny_attempt_enable` is enable. |
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// Because we want to get the last visited time and attempt counter. |
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// Otherwise, we don't update it everytime to avoid wasting CPU resource. |
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if ($this->event['update_rule_table']) { |
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$this->driver->save($this->ip, $logData, 'rule'); |
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} |
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// Notify this event to messenger. |
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if ($this->event['trigger_messengers']) { |
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$this->prepareMessengerBody($logData, $handleType); |
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} |
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return true; |
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} |
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/** |
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* Record the attempts when the user is temporarily denied by rule table. |
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* |
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* @param array $logData |
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* @param int $handleType |
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* @param int $attempts |
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* |
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* @return array |
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*/ |
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private function determineAttemptsTemporaryDeny(array $logData, int $handleType, int $attempts): array |
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{ |
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if ($this->properties['deny_attempt_enable']['data_circle']) { |
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$this->event['update_rule_table'] = true; |
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$buffer = $this->properties['deny_attempt_buffer']['data_circle']; |
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if ($attempts >= $buffer) { |
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if ($this->properties['deny_attempt_notify']['data_circle']) { |
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$this->event['trigger_messengers'] = true; |
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} |
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$logData['type'] = self::ACTION_DENY; |
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// Reset this value for next checking process - iptables. |
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$logData['attempts'] = 0; |
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$handleType = 1; |
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} |
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} |
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return [ |
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'log_data' => $logData, |
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'handle_type' => $handleType, |
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]; |
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} |
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/** |
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* Record the attempts when the user is permanently denied by rule table. |
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* |
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* @param array $logData |
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* @param int $handleType |
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* @param int $attempts |
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* |
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* @return array |
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*/ |
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private function determineAttemptsPermanentDeny(array $logData, int $handleType, int $attempts): array |
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{ |
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if ($this->properties['deny_attempt_enable']['system_firewall']) { |
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$this->event['update_rule_table'] = true; |
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// For the requests that are already banned, but they are still attempting access, that means |
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// that they are programmably accessing your website. Consider put them in the system-layer fireall |
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// such as IPTABLE. |
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$bufferIptable = $this->properties['deny_attempt_buffer']['system_firewall']; |
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if ($attempts >= $bufferIptable) { |
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if ($this->properties['deny_attempt_notify']['system_firewall']) { |
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$this->event['trigger_messengers'] = true; |
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} |
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$folder = rtrim($this->properties['iptables_watching_folder'], '/'); |
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if (file_exists($folder) && is_writable($folder)) { |
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$filePath = $folder . '/iptables_queue.log'; |
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// command, ipv4/6, ip, subnet, port, protocol, action |
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// add,4,127.0.0.1,null,all,all,drop (example) |
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// add,4,127.0.0.1,null,80,tcp,drop (example) |
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$command = 'add,4,' . $this->ip . ',null,all,all,deny'; |
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if (filter_var($this->ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) { |
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$command = 'add,6,' . $this->ip . ',null,all,allow'; |
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} |
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// Add this IP address to itables_queue.log |
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// Use `bin/iptables.sh` for adding it into IPTABLES. See document for more information. |
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file_put_contents($filePath, $command . "\n", FILE_APPEND | LOCK_EX); |
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$logData['attempts'] = 0; |
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$handleType = 2; |
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} |
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} |
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} |
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return [ |
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'log_data' => $logData, |
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'handle_type' => $handleType, |
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]; |
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} |
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} |
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terrylinooo /
shieldon
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