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Detailed explanation of php parameter filtering and data filtering examples

怪我咯
怪我咯 Original
2017-07-12 09:34:13 1537browse

下面给大家介绍下PHP数据过滤

1、php提交数据过滤的基本原则

1)提交变量进数据库时,我们必须使用addslashes()进行过滤,像我们的注入问题,一个addslashes()也就搞定了。其实在涉及到变量取值时,intval()函数对字符串的过滤也是个不错的选择。
2)在php.ini中开启magic_quotes_gpc和magic_quotes_runtime。magic_quotes_gpc可以把get,post,cookie里的引号变为斜杠。magic_quotes_runtime对于进出数据库的数据可以起到格式话的作用。其实,早在以前注入很疯狂时,这个参数就很流行了。
3)在使用系统函数时,必须使用escapeshellarg(),escapeshellcmd()参数去过滤,这样你也就可以放心的使用系统函数。
4)对于跨站,strip_tags(),htmlspecialchars()两个参数都不错,对于用户提交的的带有html和php的标记都将进行转换。比如尖括号"1575ddcf6464ad4f902f2c12b42241e5Test5db79b134e9f6b82c0b36e0489ee08ed", ENT_QUOTES);
strip_tags($text,);
5)对于相关函数的过滤,就像先前的include(),unlink,fopen()等等,只要你把你所要执行操作的变量指定好或者对相关字符过滤严密,我想这样也就无懈可击了。

2、PHP简单的数据过滤

1)入库: trim($str),addslashes($str)
2)出库:stripslashes($str)
3)显示: htmlspecialchars(nl2br($str))

下面通过一段代码给大家介绍php参数过滤

class mysafe{ public $logname; public $isshwomsg; function construct(){ set_error_handler('MyError',E_ALL); //----- } function MyError($errno, $errstr, $errfile, $errline){ echo "Error number: [$errno],error on line $errline in $errfile
"; exit; } function wlog($logs){ if(empty($logname)){ $this->logname=$_SERVER["DOCUMENT_ROOT"]."/log.htm"; } $Ts=fopen($this->logname,"a+"); fputs($Ts,$logs."\r\n"); fclose($Ts); } function showmsg($msg='',$flag=false){ $this->isshwomsg=empty($this->isshwomsg) ? false : true; if ($this->isshwomsg) { echo '
--------------------------------------
'; echo $msg; echo '
--------------------------------------
'; if ($flag) exit; } } function get_filter(){ $getfilter="'|(and|or)\\b.+?(>|<|=|in|like)|\\/\\*.+?\\*\\/|<\\s*script\\b|\\bEXEC\\b|UNION.+?SELECT|UPDATE.+?SET|INSERT\\s+INTO.+?VALUES|(SELECT|DELETE).+?FROM|(CREATE|ALTER|DROP|TRUNCATE)\\s+(TABLE|DATABASE)"; foreach($_GET as $key=>$value){ $this->StopAttack($key,$value,$getfilter); } } function post_filter(){ $postfilter="\\b(and|or)\\b.{1,6}?(=|>|<|\\bin\\b|\\blike\\b)|\\/\\*.+?\\*\\/|<\\s*script\\b|\\bEXEC\\b|UNION.+?SELECT|UPDATE.+?SET|INSERT\\s+INTO.+?VALUES|(SELECT|DELETE).+?FROM|(CREATE|ALTER|DROP|TRUNCATE)\\s+(TABLE|DATABASE)"; foreach($_POST as $key=>$value){ $this->StopAttack($key,$value,$postfilter); } } function cookie_filter(){ $cookiefilter="\\b(and|or)\\b.{1,6}?(=|>|<|\\bin\\b|\\blike\\b)|\\/\\*.+?\\*\\/|<\\s*script\\b|\\bEXEC\\b|UNION.+?SELECT|UPDATE.+?SET|INSERT\\s+INTO.+?VALUES|(SELECT|DELETE).+?FROM|(CREATE|ALTER|DROP|TRUNCATE)\\s+(TABLE|DATABASE)"; foreach($_COOKIE as $key=>$value){ $this->StopAttack($key,$value,$cookiefilter); } } //过滤参数 function StopAttack($StrFiltKey,$StrFiltValue,$ArrFiltReq){ if(is_array($StrFiltValue)){ $StrFiltValue=implode($StrFiltValue); } if (preg_match("/".$ArrFiltReq."/is",$StrFiltValue)==1){ $msg="

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; $this->wlog($msg); $this->showmsg($msg); exit(); } } function filter_value_for_sql($str){ $str = str_replace("and","",$str); $str = str_replace("execute","",$str); $str = str_replace("update","",$str); $str = str_replace("count","",$str); $str = str_replace("chr","",$str); $str = str_replace("mid","",$str); $str = str_replace("master","",$str); $str = str_replace("truncate","",$str); $str = str_replace("char","",$str); $str = str_replace("declare","",$str); $str = str_replace("select","",$str); $str = str_replace("create","",$str); $str = str_replace("delete","",$str); $str = str_replace("insert","",$str); $str = str_replace("'","",$str); $str = str_replace('"',"",$str); $str = str_replace(" ","",$str); $str = str_replace("or","",$str); $str = str_replace("=","",$str); $str = str_replace(" ","",$str); return $str; } //class end }

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