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上传目录变后门温床：三招封死WebShell上传_我的网站

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　    一键部署OpenClaw        WebShell最常见的落地方式不是直接攻破服务器，而是通过上传功能把脚本文件传上去。图片上传、头像上传、附件上传，只要后缀没校验好，就可能变成木马的入口。    Late Major Mohit Sharma's parents have approached the Delhi High Court and sought an immediate stay on the release of Ranveer Singh and Aditya Dhar's Dhurandhar. The family alleged that the upcoming film draws heavy inspiration from the life of the Ashoka Chakra and Sena Medal awardee, without the permission of the family or the Indian Army.     They alleged that various elements shown in the trailer and promotional videos seem to replicate major events from Sharma's military career, including classified counter-terrorism operations and undercover missions.In its plea, the family members stated that a martyr is not a commercial commodity and his life cannot be recreated for profit, 'without truth, dignity and due permission.'          Besides violating the family's right to privacy, the film also portrays sensitive military strategies, claimed the family. They said that infiltration methods and operational details of the security forces have been revealed in Dhurandhar and argued that it can cause National Security concerns. Sharma's family also alleged that the makers did this without obtaining clearance or approving the script from the Indian Army's Additional Directorate General of Public Information (ADGPI). ADGPI is responsible for seeing how the Indian Army is represented in films and media.          Citing these reasons, the family requested the Delhi High Court to halt the release of Ranveer Singh's film until they are allowed to watch it privately.     Meanwhile, filmmaker Aditya Dhar has already clarified that Dhurandhar is not based on Major Mohit Sharma. Ever since the trailer released, speculations had been going around its real-life connections, as the film is reportedly inspired by actual events. One such rumoured connection suggested that Ranveer Singh's character is linked to Major Mohit Sharma, who reportedly operated undercover as Iftikhar Bhatt and infiltrated Hizbul Mujahideen in the early 2000s.     In response to a question from Madhur Sharma, Mohit's brother, who had tagged him to confirm, Aditya wrote, "Hi, sir - our film Dhurandhar is not based on the life of brave heart Major Mohit Sharma AC(P) SM. This is an official clarification. I assure you, if we do make a biopic on Mohit sir in the future, we will do it with full consent and in complete consultation with the family, and in a way that truly honours his sacrifice for the nation and the legacy it has left for all of us."          Major Mohit was posthumously honoured with the Ashoka Chakra, India's highest peacetime military decoration, for his ultimate sacrifice in 2009 during a fight with terrorists in the Kupwara sector of Jammu and Kashmir.          Dhurandhar will be released theatrically on December 5.     Also Read: Aditya Dhar Says Dhurandhar Has No Link to Major Mohit Sharma’s Life。    

    第一招是校验文件头。不能只看扩展名，jpg/png都有固定文件头，用PHP的getimagesize或者Python的imghdr可以识别真伪。    第二招是重命名文件，把用户上传的文件名换成随机字符串，不让原始文件名执行。

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$info = getimagesize($_FILES['file']['tmp_name']);
if (!$info || !in_array($info[2], [IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_GIF])) {
 exit('仅允许上传图片');
}
 
$ext = image_type_to_extension($info[2], true);
$save_name = md5(uniqid()) . $ext;
move_uploaded_file($_FILES['file']['tmp_name'], '/upload/' . $save_name);
?>

    第三招是Web服务器层直接禁止执行。上传目录只读、不执行任何脚本，木马传上来也跑不起来。这是最后一道防线，必须做。    # Nginx：上传目录禁止脚本执行    location ^~ /upload/ {    location ~ \*\.(php|php5|phtml|asp|aspx|cer|jsp)$ {    deny all;    }    }    # IIS：在处理程序映射里删除上传目录的脚本映射，或在web.config中加规则    数据来源：OWASP文件上传安全指南、Nginx官方location匹配文档             

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