网鼎杯 2020 玄武组 SSRFMe
复习一下常见的redis主从复制 主要是redis伪服务器的选择和一些小细节 <?php function check_inner_ip($url) { $match_result=preg_match('/^(http|https|gopher|dict)?:\/\/.*(\/)?.*$/',$url); if (!$match_result) { die('url fomat error'); } try { $url_parse=parse_url($url); } catch(Exception $e) { die('url fomat error'); return false; } $hostname=$url_parse['host']; $ip=gethostbyname($hostname); $int_ip=ip2long($ip); return ip2long('127.0.0.0')>>24 == $int_ip>>24 || ip2long('10.0.0.0')>>24 == $int_ip>>24 || ip2long('172.16.0.0')>>20 == $int_ip>>20 || ip2long('192.168.0.0')>>16 == $int_ip>>16; } function safe_request_url($url) { if (check_inner_ip($url)) { echo $url.' is inner ip'; } else { $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_HEADER, 0); $output = curl_exec($ch); $result_info = curl_getinfo($ch); if ($result_info['redirect_url']) { safe_request_url($result_info['redirect_url']); } curl_close($ch); var_dump($output); } } if(isset($_GET['url'])){ $url = $_GET['url']; if(!empty($url)){ safe_request_url($url); } } else{ highlight_file(__FILE__); } // Please visit hint.php locally. ?> 存在 curl_exec 执行 ssrf 对ip网段进行限制 ...