PHP中使用addslashes函数转义的安全性原理分析,addslashes转义
PHP中使用addslashes函数转义的安全性原理分析,addslashes转义
本文实例讲述了PHP中使用addslashes函数转义的安全性原理分析。分享给大家供大家参考。具体分析如下:
先来看一下ECshop中addslashes_deep的原型
复制代码 代码如下:
function addslashes_deep($value) {
if (empty($value)) {
return $value; //如为空,直接返回;
} else {
return is_array($value) ? array_map('addslashes_deep', $value): addslashes($value);
} //递归处理数组,直至遍历所有数组元素;
}
addslashes_deep函数本身没有问题,但使用时得注意一点
恰好今天也是在网上看到了有人发了关于使用这个函数使用的BUG注入漏洞
这个函数在引用回调函数addslashes时,只对数据的值进行转义,所以如果使用者在此过程中引用数组的键进行特定处理时,存在$key注入风险,此时可更改addslashes_deep函数,使其同时对键值进行转义,或者使用时明确不引用键内容。
希望本文所述对大家的PHP程序设计有所帮助。
addslashes -- 使用反斜线引用字符串
string addslashes ( string str )
返回字符串,该字符串为了数据库查询语句等的需要在某些字符前加上了反斜线。这些字符是单引号(')、双引号(")、反斜线(\)与 NUL(NULL 字符)。
一个使用 addslashes() 的例子是当你要往数据库中输入数据时。例如,将名字 O'reilly 插入到数据库中,这就需要对其进行转义。大多数据库使用 \ 作为转义符:O\'reilly。这样可以将数据放入数据库中,而不会插入额外的 \。当 PHP 指令 magic_quotes_sybase 被设置成 on 时,意味着插入 ' 时将使用 ' 进行转义。
默认情况下,PHP 指令 magic_quotes_gpc 为 on,它主要是对所有的 GET、POST 和 COOKIE 数据自动运行 addslashes()。不要对已经被 magic_quotes_gpc 转义过的字符串使用 addslashes(),因为这样会导致双层转义。遇到这种情况时可以使用函数 get_magic_quotes_gpc() 进行检测。
看一下是不是需要反引用一个使用 addcslashes 转义的字符串,用 stripcslashes 函数可以解开

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