我正试图通过sql注入来保护我页面上的登录表单.在服务器端,我使用Zend Framework(Zend_Db,Zend_Db_Table_Abstract),但它的内置注入防止功能：quote,quoteInto,quoteIdentifier不能很好地工作(据我知道如何使用它们).其他方式如mysql_real_escape_string,addslashes似乎根本不起作用……

这就是我正在尝试为防御实现的：

function prevent_from_sql_injection($str) {
    if(preg_match('/[\'"]/',$str))
     {die('attack1'); exit;  }// no quotes
elseif(preg_match('/[\/\\\\]/',$str))
     {die('attack2'); exit;  }// no slashes
elseif(preg_match('/(and|or|null|not)/i',$str))
     {die('attack3'); exit;  }// no sqli boolean keywords
elseif(preg_match('/(union|select|from|where)/i',$str))
     {die('attack4'); exit;  }// no sqli select keywords
elseif(preg_match('/(group|order|having|limit)/i',$str))
     {die('attack5'); exit;  }//  no sqli select keywords
elseif(preg_match('/(into|file|case|LOAD_FILE|DUMPFILE|char|schema|AES_DECRYPT|AES_ENCRYPT)/i',$str))
     {die('attack6'); exit;  }// no sqli operators
elseif(preg_match('/(--|#|\/\*)/',$str))
     {die('attack7'); exit; }// no sqli comments
elseif(preg_match('/(=|&|\|)/',$str))
     {die('attack8'); exit;  }// no boolean operators
elseif(preg_match('/(UNI\*\*ON|1 OR 1=1|1 AND 1=1|1 EXEC XP_)/',$str))
     {die('attack9'); exit; }
elseif(preg_match('/(1|'| |O|R|=|&#49&#39&#32&#79&#82&#32&#39&#49&#39&#61&#39&#49|%31%27%20%4F%52%20%27%31%27%3D%27%31)/',$str))
     { die('attack10'); exit; }
elseif(preg_match('/(SELECT\s[\w\*\)\(\,\s]+\sFROM\s[\w]+)| (UPDATE\s[\w]+\sSET\s[\w\,\'\=]+)| (INSERT\sINTO\s[\d\w]+[\s\w\d\)\(\,]*\sVALUES\s\([\d\w\'\,\)]+)| (DELETE\sFROM\s[\d\w\'\=]+)/',$str))
     { die('attack11'); exit; } 
elseif(preg_match('/(script)|(<)|(>)|(%3c)|(%3e)|(SELECT) |(UPDATE) |(INSERT) |(DELETE)|(GRANT) |(REVOKE)|(UNION)|(<)|(>)/',$str))
     { die('attack12'); exit; } 
elseif(!preg_match('/^["a-zA-Z0-9\040]+$/',$str))
     { die('attack13'); exit; } 
else return $str;

}

至于测试我的结果,我使用Firefox扩展SQL Inject Me,它显示了14个错误(有时21或17,我不知道为什么结果不同)：

Server Status Code: 302 Found
Tested value: 1' OR '1'='1
Server Status Code: 302 Found
Tested value: 1 UNI/**/ON SELECT ALL FROM WHERE
Server Status Code: 302 Found
Tested value: &#49&#39&#32&#79&#82&#32&#39&#49&#39&#61&#39&#49
Server Status Code: 302 Found
Tested value: 1 OR 1=1
Server Status Code: 302 Found
Tested value: 1' OR '1'='1
Server Status Code: 302 Found
Tested value: 1 EXEC XP_
Server Status Code: 302 Found
Tested value: 1 UNION ALL SELECT 1,2,3,4,5,6,name FROM sysObjects WHERE xtype = 'U' --
Server Status Code: 302 Found
Tested value: %31%27%20%4F%52%20%27%31%27%3D%27%31
Server Status Code: 302 Found
Tested value: 1 AND 1=1
Server Status Code: 302 Found
Tested value: 1' OR '1'='1
Server Status Code: 302 Found
Tested value: 1 AND ASCII(LOWER(SUBSTRING((SELECT TOP 1 name FROM sysobjects WHERE xtype='U'),1,1))) > 116

那么防止所有这些sql注入攻击的最佳方法是什么？使用占位符是好的,但在某些情况下它并不好.也许这个扩展是错误的,我有一个偏执狂？