[Tutorial] FIXANDO SQL INJECT PARA NÃO ACEITAR O NOME WEBZEN

<?PHP


class sql_inject
{
/**
* @shortdesc url to redirect if an sql inject attempt is detect. if unset, value is FALSE
* @private
* @type mixed
*/
var $urlRedirect;
/**
* @shortdesc does the session must be destroy if an attempt is detect
* @private
* @type bool
*/
var $bdestroy_session;
/**
* @shortdesc the SQL data currently test
* @private
* @type string
*/
var $rq;
/**
* @shortdesc if not FALSE, the url to the log file
* @private
* @type mixed
*/
var $bLog;

/**
* Builder
*
* @param bool bdestroy_session optional. does the session must be destroy if an attempt is detect?
* @param string urlRedirect optional. url to redirect if an sql inject attempt is detect
* @public
* @type void
*/
function sql_inject($mLog=FALSE,$bdestroy_session=FALSE,$urlRedirect=FALSE)
{
$this->bLog = (($mLog!=FALSE)?$mLog:'');
$this->urlRedirect = (((trim($urlRedirect)!='') && file_exists($urlRedirect))?$urlRedirect:'');
$this->bdestroy_session = $bdestroy_session;
$this->rq = '';
}

/**
* @shortdesc test if there is a sql inject attempt detect
* test if there is a sql inject attempt detect
*
* @param string sRQ required. SQL Data to test
* @public
* @type bool
*/
function test($sRQ)
{
$sRQ = strtolower($sRQ);
$this->rq = $sRQ;
$aValues = array();
$aTemp = array(); // temp array
$aWords = array(); //
$aSep = array(' and ',' or '); // separators for detect the
$sConditions = '(';
$matches = array();
$sSep = '';
// is there an attempt to unused part of the rq?
if (is_int((strpos($sRQ,"#")))&&$this->_in_post('#')) return $this->detect();

// is there a attempt to do a 2nd SQL requete ?
if (is_int(strpos($sRQ,';'))){
$aTemp = explode(';',$sRQ);
if ($this->_in_post($aTemp[1])) return $this->detect();
}

$aTemp = explode(" where ",$sRQ);
if (count($aTemp)==1) return FALSE;
$sConditions = $aTemp[1];
$aWords = explode(" ",$sConditions);
if(strcasecmp($aWords[0],'select')!=0) $aSep[] = ',';
$sSep = '('.implode('|',$aSep).')';
$aValues = preg_split($sSep,$sConditions,-1, PREG_SPLIT_NO_EMPTY);

// test the always true expressions
foreach($aValues as $i => $v)
{
// SQL injection like 1=1 or a=a or 'za'='za'
if (is_int(strpos($v,'=')))
{
$aTemp = explode('=',$v);
if (trim($aTemp[0])==trim($aTemp[1])) return $this->detect();
}

//SQL injection like 1<>2
if (is_int(strpos($v,'<>')))
{
$aTemp = explode('<>',$v);
if ((trim($aTemp[0])!=trim($aTemp[1]))&& ($this->_in_post('<>'))) return $this->detect();
}
//SQL injection got '--'
if (is_int(strpos($v,'--')))
{
return $this->detect();
}
//SQL injection got ';'
if (is_int(strpos($v,';')))
{
return $this->detect();
}
}

if (strpos($sConditions,' null'))
{
if (preg_match("/null +is +null/",$sConditions)) return $this->detect();
if (preg_match("/is +not +null/",$sConditions,$matches))
{
foreach($matches as $i => $v)
{
if ($this->_in_post($v))return $this->detect();
}
}
}

if (preg_match("/[a-z0-9]+ +between +[a-z0-9]+ +and +[a-z0-9]+/",$sConditions,$matches))
{
$Temp = explode(' between ',$matches[0]);
$Evaluate = $Temp[0];
$Temp = explode(' and ',$Temp[1]);
if ((strcasecmp($Evaluate,$Temp[0])>0) &&
(strcasecmp($Evaluate,$Temp[1])<0) && $this->_in_post($matches[0])) return $this->detect();
}
return FALSE;
}

function _in_post($value)
{
foreach($_POST as $i => $v)
{
if (is_int(strpos(strtolower($v),$value))) return TRUE;
}
return FALSE;
}

function detect()
{
// log the attempt to sql inject?
if ($this->bLog)
{
$fp = @fopen($this->bLog,'a+');
if ($fp)
{
fputs($fp,"\r\n".date("d-m-Y H:i:s").' ['.$this->rq.'] from '.$this->sIp = getenv("REMOTE_ADDR"));
fclose($fp);
}
}
// destroy session?
if ($this->bdestroy_session) session_destroy();
// redirect?
if ($this->urlRedirect!=''){
exit("<script>document.location='$this->urlRedirect'</script>");
}
return TRUE;
}


function protect1($protected) { // This Will be the fuction we call to protect the variables.
$banlist = array ("'", "shutdown", "or", "-", "--", "or=", "del", "[", ")--", "Character", "dbo", "WHERE", "Set", "]", "\"", "<", "\\", "|", "/", "=",
"insert", "select", "update", "delete", "distinct",
"having", "truncate", "'", "replace", "handler", "like", "webzen", "procedure", "limit", "order by", "group by", "asc", "warehouse", "DEL", "$", "sele", "+", "+ dx", " dx", "memb_info", "desc");
//$banlist is the list of words you dont want to allow.
if ( eregi ( "[a-zA-Z0-9@]+", $protected ) ) { // Makes sure only legitimate Characters are used.
$protected = trim(str_replace($banlist, '', $protected)); //
Takes out whitespace, and removes any banned words.
return $protected;
//echo "+";
} else {
//echo "-";
echo $protected;
die ( ' Is invalid for that spot, please try a different entry.' ); // Message if thier is any characters not in [a-zA-Z0-9].
} // ends the if ( eregi ( "[a-zA-Z0-9]+", $this->protected ) ) {
} // ends the function Protect() {

function protect2($protected) { // This Will be the fuction we call to protect the variables.
$banlist = array ("'", "shutdown", "or", "-", "--","-", "or=", "del", "[", ")--", "Character", "dbo", "WHERE", "Set", "]", "\"", ">", "<", "\\", "|", "/", "=", "insert", "select", "update", "delete", "distinct", "having", "truncate", "'", "replace", "handler", "like", "webzen", "procedure", "limit", "order by", "group by", "asc", "warehouse", "DEL", "$", "sele", " +", " + ", "+", "+ dx", " dx", "memb_info", "desc");
//$banlist is the list of words you dont want to allow.
if ( eregi ( "[0-9]+", $protected ) ) { // Makes sure only legitimate Characters are used.
$protected = trim(str_replace($banlist, '', $protected)); // Takes out whitespace, and removes any banned words.
return $protected;
//echo "+";
} else {
//echo "-";
echo $protected;
die ( ' Caracteres Invalidos' ); // Message if thier is any characters not in [a-zA-Z0-9].
} // ends the if ( eregi ( "[a-zA-Z0-9]+", $this->protected ) ) {
} // ends the function Protect() {


}
?>
<?php
$badwords = array("+","--)","DEL","(",")","--","-","'","del","DEL","insert","webzen","UPDATE","update","=","drop","sele","$","warehouse ","Dexterity","WHERE");

foreach($_POST as $value)
foreach($badwords as $word)
if(substr_count($value, $word) > 0)
die("<div align=\"center\">
<p><br>
<p>&nbsp;</p>
<p>&nbsp;</p>
<img src=\"images/no-page.gif\" /><br />
<br />
<span class=\"textbox style20\">N&atilde;o use Caracteres Especiais! </span></p>
<p><br />
<a href=\"javascript: history.back(-1);\" class=\"style30\">Voltar</a></p>
</div>");
?>