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Detailed explanation of php curl with csrf-token verification simulation submission method php example

jackloveOriginal: 2018-06-27 17:39:371609browse

This article mainly introduces the detailed explanation of the simulated submission method of php curl with csrf-token verification. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let’s follow the editor and take a look.

Usually for security reasons, a random token value is added to the form to prevent CSRF attacks.

It is actually not difficult to simulate submitting a website with token verification.

1. Obtain the token through regular expressions
2. Bring the obtained token to simulate submission

The following is a successful example

Table of Contents Structure

│ form.php –需要模拟的表单 
│ getForm.php – 模拟提交程序 
│ post.php –表单验证程序 
│ 
└─cookie – cookie存放目录

getForm.php

<?php
$cookie_file = &#39;./cookie/&#39;.time().&#39;.cookie&#39;;
$str = getResponse(&#39;http://a.curl.com:81/form.php&#39;,[],$cookie_file);
setcookie("PHPSESSID", "vc0heoa6lfsi3gger54pkns152");
preg_match(&#39;/<input name="token" type="hidden" value="(.*)"/U&#39;, $str, $match);

$post[&#39;token&#39;] = $match[1];
$post[&#39;name&#39;] = &#39;3333333&#39;;
$post[&#39;password&#39;] = &#39;12121213&#39;;
print_r(getResponse(&#39;http://a.curl.com:81/post.php&#39;, $post, $cookie_file));

function getResponse($url, $data=[], $cookie_file=&#39;&#39;, $timeout = 3)
  {
    if(empty($cookie_file))
    {
      $cookie_file = &#39;.cookie&#39;;
    }

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_REFERER, "https://www.baidu.com");  //构造来路
    curl_setopt($ch, CURLOPT_USERAGENT,"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.59 Safari/537.36");

    if(!empty($data))
    {
      curl_setopt($ch, CURLOPT_POST, true);
      curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    }
    curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file);// 取cookie的参数是
    curl_setopt ($ch, CURLOPT_COOKIEFILE, $cookie_file); //发送cookie
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
    try
    {
       $handles = curl_exec($ch);
       curl_close($ch);
       return $handles;
    }
    catch (Exception $e)
    {
      echo &#39;Caught exception: &#39;, $e->getMessage(), "\n";
    }
    unlink($cookie_file);
  }

form.php

<?php
session_start();
$_SESSION[&#39;token&#39;] = md5($_SERVER[&#39;REQUEST_TIME&#39;]);
$_SESSION[&#39;time&#39;] = date("Y-m-d H:i:s");
session_write_close();
//echo $_SESSION[&#39;auth&#39;];
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
 <title> new document </title>
 <meta name="generator" content="editplus" />
 <meta name="author" content="" />
 <meta name="keywords" content="" />
 <meta name="description" content="" />
 </head>
 <body>
<form action="post.php" method="post">
  <p><input name="name" type="text"></p>
  <p><input name="password" type="password"></p>
  <p><input name="token" type="hidden" value="<?php echo $_SESSION[&#39;token&#39;]?>"></p>
  <p><input type="submit"></p>
</form>
 </body>
</html>

post.php

<?php
session_start();
if(empty($_POST[&#39;token&#39;]))
{
  exit ("token is empty!");
}

if(empty($_SESSION[&#39;token&#39;]))
{
 exit ("session is empty");
}

if($_POST[&#39;token&#39;] != $_SESSION[&#39;token&#39;])
{
  exit ("token ");
} else
{
  unset($_SESSION[&#39;token&#39;]);
}

echo PHP_EOL;
echo "pass";
print_r($_REQUEST);

echo PHP_EOL;
print_r($_SERVER);

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