介绍

PHP 数据对象PDO) 扩展为PHP访问数据库定义了一个轻量级的一致接口。实现 PDO 接口的每个数据库驱动可以公开具体数据库的特性作为标准扩展功能。 注意利用 PDO 扩展自身并不能实现任何数据库功能;必须使用一个 具体数据库的 PDO 驱动 来访问数据库服务。

PDO 提供了一个 数据访问 抽象层,这意味着,不管使用哪种数据库,都可以用相同的函数(方法)来查询和获取数据。 PDO 不提供 数据库 抽象层;它不会重写 SQL,也不会模拟缺失的特性。如果需要的话,应该使用一个成熟的抽象层。

从 PHP 5.1 开始附带了 PDO,在 PHP 5.0 中是作为一个 PECL 扩展使用。 PDO 需要PHP 5 核心的新 OO 特性,因此不能在较早版本的 PHP 上运行

为什么要使用pdo

一般我们使用mysql的使用都是用addslashes和mysql_real_escape_string 来转义后然后写入数据库(注:请弃用mysql_escape_string)

mysql_real_escape_stringaddslashes的区别在于

区别一

addslashes不知道任何有关MySQL连接的字符集。
如果你给所使用的MySQL连接传递一个包含字节编码之外的其他编码的字符串,
它会很愉快地把所有值为字符'、"、\和\x00的字节进行转义。
如果你正在使用不同于8位和UTF-8的其它字符,
这些字节的值不一定全部都是表示字符'、"、\和\x00。可能造成的结果是,MySQL接收这些字符后出现错误。
如果要修正这个bug,可尝试使用iconv函数,将变量转为UTF-16,然后再使用addslashes进行转义。

区别二

与addslashes对比,mysql_real_escape_string同时还对\r、\n和\x1a进行转义。看来,这些字符必须正确地告诉MySQL,否则会得到错误的查询结果

在GBK里,0xbf27不是一个合法的多字符字符,但0xbf5c却是。在单字节环境里,0xbf27被视为0xbf后面跟着0x27('),同时0xbf5c被视为0xbf后面跟着0x5c(\)。

一个用反斜杠转义的单引号,是无法有效阻止针对MySQL的SQL注入攻击的。
如果你使用addslashes,那么,我(攻击者,下同)是很幸运的。
我只要注入一些类似0xbf27,然后addslashes将它修改为0xbf5c27,一个合法的多字节字符后面接着一个单引号。
换句话说,我可以无视你的转义,成功地注入一个单引号。这是因为0xbf5c被当作单字节字符,而非双字节。

所以不管转义,针对针对php 5.3.6以前版本,这套方法还是可以找到漏洞的,所以请使用pdo

为什么pdo就能防止注入呢(PDO::ATTR_EMULATE_PREPARES, false)

<?php

$db = new PDO("mysql:host=10.0.0.234;dbname=test;","test","123456");

$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
//$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$st = $db->prepare("select * from acc_admin where uid =? and username = ?"); $id = 1;
$name = 'admin'; $st->bindParam(1,$id);
$st->bindParam(2,$name);
$st->execute(); $res = $st->fetchAll();
var_dump($res);

使用Wireshark抓包可以看到

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" alt="" />

这就是神奇之处,可见这次PHP是将SQL模板和变量是分两次发送给MySQL的,由MySQL完成变量的转义处理,既然变量和SQL模板是分两次发送的,那么就不存在SQL注入的问题了,但需要在DSN中指定charset属性,如:

$pdo = new PDO('mysql:host=localhost;dbname=test;charset=utf8', 'root');

使用PDO的注意事项

1. php升级到5.3.6+,生产环境强烈建议升级到php 5.3.9+ php 5.4+,php 5.3.8存在致命的hash碰撞漏洞。
2. 如果使用了PHP 5.3.6及以前版本,设置PDO::ATTR_EMULATE_PREPARES参数为false(即由MySQL进行变量处理),php 5.3.6以上版本已经处理了这个问题,无论是使用本地模拟prepare还是调用mysql server的prepare均可。在DSN中指定charset是无效的,同时set names <charset>的执行是必不可少的。

参考

http://php.net/manual/zh/intro.pdo.php

http://zhangxugg-163-com.iteye.com/blog/1835721

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