我正在对使用简单的mysql_query()函数进行所有数据库查询的客户端网站进行一些维护。在他们的一个页面上,完成查询以基于他们的昵称来提取用户信息。该文件非常强大,并且通过更改每个实例以从用户标识中取出昵称并非真正可行。Mysql/PHP查询包含保留字的表值
他们遇到了一些昵称的问题,特别是“链接”,“回声”,“杀手”。我明白了为什么链接和回显可能会导致查询出现问题,但不是那么多Slayer。有什么我可以做的(除了防止将来创建这些名称)来帮助查询完成并提取我需要的信息?
编辑: 全功能:
function userInfo($username){
global $username_array;
$username = prepare($username);
$username_array = mysql_fetch_array(mysql_query("SELECT * FROM `users` WHERE `name` = '$username' LIMIT 1"));
}
应该返回数组$ username_array回到原来的脚本。有99%的用户,这工作正常。出于某种原因,上面的用户,这完成不了。
function prepare($val,$type=0){
$val = XSS($val);
$val = sqlInjection($val);
return $val;
}
function XSS($val) {
// remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed
$val = preg_replace('/([\x00-\x08][\x0b-\x0c][\x0e-\x20])/', '', $val);
// straight replacements, the user should never need these since they're normal characters
// this prevents like <IMG SRC=@avascript:alert('XSS')>
$search = 'abcdefghijklmnopqrstuvwxyz';
$search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$search .= '[email protected]#$%^&*()';
$search .= '~`";:?+/={}[]-_|\'\\';
for ($i = 0; $i < strlen($search); $i++) {
// ;? matches the ;, which is optional
// 0{0,7} matches any padded zeros, which are optional and go up to 8 chars
// @ @ search for the hex values
$val = preg_replace('/(&#[x|X]0{0,8}'.dechex(ord($search[$i])).';?)/i', $search[$i], $val); // with a ;
// @ @ 0{0,7} matches '0' zero to seven times
$val = preg_replace('/(�{0,8}'.ord($search[$i]).';?)/', $search[$i], $val); // with a ;
}
// now the only remaining whitespace attacks are \t, \n, and \r
$ra1 = Array('javascript', 'vbscript', 'expression', 'applet', 'blink', 'script', 'iframe', 'frameset', 'ilayer', 'bgsound');
$ra2 = Array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');
$ra = array_merge($ra1, $ra2);
$found = true; // keep replacing as long as the previous round replaced something
while ($found == true) {
$val_before = $val;
for ($i = 0; $i < sizeof($ra); $i++) {
$pattern = '/';
for ($j = 0; $j < strlen($ra[$i]); $j++) {
if ($j > 0) {
$pattern .= '(';
$pattern .= '(&#[x|X]0{0,8}([9][a][b]);?)?';
$pattern .= '|(�{0,8}([9][10][13]);?)?';
$pattern .= ')?';
}
$pattern .= $ra[$i][$j];
}
$pattern .= '/i';
$replacement = substr($ra[$i], 0, 2).'<x>'.substr($ra[$i], 2); // add in <> to nerf the tag
$val = preg_replace($pattern, $replacement, $val); // filter out the hex tags
if ($val_before == $val) {
// no replacements were made, so exit the loop
$found = false;
}
}
}
return $val;
}
function sqlInjection($val){
if (get_magic_quotes_gpc()){
$val = stripslashes($val);
}
if(version_compare(phpversion(),"4.3.0") == "-1"){
return mysql_escape_string($val);
}else{
return mysql_real_escape_string($val);
}
}
什么是查询? – rid 2012-03-14 18:34:11
永远不应该有这样一种情况,即用户名是一个保留字可能会导致您的查询失败,除非您做了非常*错误的事情。 – 2012-03-14 18:36:58
查询:$ username_array = mysql_fetch_array(mysql_query(“SELECT * FROM'users' WHERE'name' ='$ username'LIMIT 1”));当你回显查询字符串时,它是SELECT * FROM'用户'WHERE'name' ='Slayer'LIMIT 1“ – Eric 2012-03-14 18:39:16