Mysql security testing-Mysql Tutorial-php.cn

Mysql security testing

高洛峰

Release： 2016-11-21 16:30:36

Original

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一、没有进行预处理的SQL语句

<?php
    
    // 1.连接数据库
  $conn = mysql_connect(&#39;127.0.0.1:3306&#39;, &#39;root&#39;, &#39;518666&#39;);
  if (!$conn)
  {
    die("Could not connect:" . mysql_error());
  }

  // 2.选择数据库
  mysql_select_db(&#39;mysql_safe&#39;, $conn);


  // 3.设置编码,注意这里是utf8而不是utf-8,如果写后者，MySQL不会识别的，会出现乱码的。
  mysql_query("SET NAMES utf8");

  $title    = "我们的爱情";
  $content  = &#39;你是/谁啊，大几\都"老梁"做做&>women<a>没&#39;;
  $add_time = date("Y-m-d H:i:s");

  // 转义字符
  $content = mysql_real_escape_string($content);
  $content = htmlspecialchars($content, ENT_COMPAT);
  // 你是/谁啊，大几都做做&amp;&gt;women&lt;a&gt;没   // 自动过滤反斜杠
/*
  // 4.插入一条数据
  $insert_sql = "insert into post_tbl (title, content, user_id, add_time) values (&#39;{$title}&#39;, &#39;{$content}&#39;, &#39;4742551&#39;, &#39;{$add_time}&#39;)";
 if(mysql_query($insert_sql))
  {
    echo &#39;ok&#39;;

  }
  else
  {
    echo "Error : " . mysql_error();
  }
   $ret = mysql_affected_rows();
  print_r($ret);
  */
   // 5.PDO预处理插入
   // PDO（PHP Data Object）则是提供了一个 Abstraction Layer 来操作数据库
    // 查询
    $user_id  = 174742;
    $password = "&#39;&#39;or &#39;1=1&#39;" ;
    $sql = "select * from post_tbl where user_id = {$user_id} and password = {$password}";

    print_r($sql);
    $query  = mysql_query($sql);
    // $result = mysql_fetch_array($query);

    $rows = array();
    while($row=mysql_fetch_array($query))
    {
         $rows[] = $row;
    }

   
    print_r( $rows);




  // 关闭数据库连接
  mysql_close($conn);

/*

$str = "Bill & &#39;Steve&#39;";
echo htmlspecialchars($str, ENT_COMPAT); // 只转换双引号
echo "<br>";
echo htmlspecialchars($str, ENT_QUOTES); // 转换双引号和单引号
echo "<br>";
echo htmlspecialchars($str, ENT_NOQUOTES); // 不转换任何引号
*/

/*
以上代码的 HTML 输出如下（查看源代码）：
<!DOCTYPE html>
<html>
<body>
Bill &amp; &#39;Steve&#39;<br>
Bill &amp; &#039;Steve&#039;<br>
Bill &amp; &#39;Steve&#39;
</body>
</html>
以上代码的浏览器输出：
Bill & &#39;Steve&#39;
Bill & &#39;Steve&#39;
Bill & &#39;Steve&#39;
*/

  function mforum_html_tag_to_html_entity($content)
{
  $content = (string)trim($content);
  if(empty($content)) return &#39;&#39;;
  // $content = str_replace(&#39; &#39;, &#39; &#39;, $content);
  $content = htmlspecialchars($content, ENT_COMPAT, GB2312, false);
  $content = str_replace("&gt;", "&#62;", $content);
  $content = str_replace("&lt;", "&#60;", $content);
  $content = str_replace("\"", "&quot;", $content);
  $content = preg_replace("/\\\$/", "&#036;", $content);
  $content = preg_replace("/\r/", "", $content);
  $content = str_replace("!", "&#33;", $content);
  $content = str_replace("&#39;", "&#39;", $content);
  $content = preg_replace("/\\\/", "&#092;", $content);

  // 内容敏感词过滤
  return $content;
}

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二、PDO处理的SQL语句

<?php  

// PDO的使用
// http://blog.csdn.net/qq635785620/article/details/11284591
$dbh = new PDO(&#39;mysql:host=127.0.0.1:3306;dbname=mysql_safe&#39;, &#39;root&#39;, &#39;518666&#39;); 
 
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);    
$dbh->exec(&#39;set names utf8&#39;);   

$title    = "我们的爱情";
$content  = &#39;你是/谁啊，大几\都"老梁"做做&>women<a>没&#39; . " 测试打印号&#39;我是单引号&#39;哈哈";
$user_id  = 174742;
$add_time = date("Y-m-d H:i:s");

// $insert_sql = "insert into post_tbl (title, content, user_id, add_time) values (:x_title, :x_content, :x_user_id, :x_add_time)";

// $stmt = $dbh->prepare($insert_sql); 
// $stmt->execute(array(&#39;x_title&#39;=>$title,&#39;:x_content&#39;=> $content, &#39;:x_user_id&#39; => $user_id, &#39;:x_add_time&#39; => $add_time));    

// 查询
$user_id  = "17474#";
// $password = "&#39;&#39;or &#39;1=1&#39;";
 $password = 123456;
$sql = &#39;select * from post_tbl where user_id = :x_user_id and password = :x_password&#39;;
$stmt = $dbh->prepare($sql);    
$stmt->execute(array(&#39;:x_user_id&#39;=>$user_id, &#39;:x_password&#39; => $password));    

$rows = array();
while($row = $stmt->fetch(PDO::FETCH_ASSOC))
{   
   $rows[] = $row;    
    
}   
print_r($rows);    

// echo $dbh->lastinsertid();

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