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- /**
- +----------------------------------------------------------
- * The goal of this function is to be a generic function that can be used to parse almost any input and * render it xss safe. For more information on actual XSS attacks, check out http://ha.ckers.org/xss.html. * Another excellent site is the XSS Database which details each attack and how it works.
- * XSS过滤
- +----------------------------------------------------------
- * @param mixed $value 变量
- +----------------------------------------------------------
- * @return mixed 过滤后的字符串
- +----------------------------------------------------------
- */
- function RemoveXSS($val) {
- // remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed
- // this prevents some character re-spacing such as <java\0script>
- // note that you have to handle splits with \n, \r, and \t later since they *are* allowed in some // inputs
- $val = preg_replace('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/', '', $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';
- $search .= '1234567890!@#$%^&*()';
- $search .= '~`";:?+/={}[]-_|\'\\';
- for ($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
- $val = preg_replace('/(&#[xX]0{0,8}'.dechex(ord($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', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');
- $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 .= '(&#[xX]0{0,8}([9ab]);)';
- $pattern .= '|';
- $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;
- }
- /*
- +----------------------------------------------------------
- * 函数名称:inject_check()
- +----------------------------------------------------------
- * 函数作用:检测提交的值是不是含有 sql 注射的字符,防止注射,保护服务器安全
- +----------------------------------------------------------
- * @param mixed $sql_str: 提交的变量
- +----------------------------------------------------------
- * @return mixed 返回检测结果,ture or false
- +----------------------------------------------------------
- */
- function inject_check($sql_str) {
- return $sql_str = preg_replace('select|insert|update|delete|\'|\/\*|\*|\.\.\/|\.\/|union|into|load_file|outfile','', $sql_str); // 进行过滤
- /*
- +----------------------------------------------------------
- * 函数名称:escapeMysql()
- * SQL注入主要是提交不安全的数据给数据库来达到攻击目的。为了防止SQL注入攻击,PHP自带一个功能可以对输入的字符串进行处理,可以在较底层对 * 输入进行安全上的初步处理,也即Magic Quotes。(php.ini magic_quotes_gpc)。如果magic_quotes_gpc选项启用,那么输入的字符串 * 中的单引号,双引号和其它一些字符前将会被自动加上反斜杠\。
- * 但Magic Quotes并不是一个很通用的解决方案,没能屏蔽所有有潜在危险的字符,并且在许多服务器上Magic Quotes并没有被启用。所以,我们 * 还需要使用其它多种方法来防止SQL注入。许多数据库本身就提供这种输入数据处理功能。例如PHP的MySQL操作函数中有一个叫 * mysql_real_escape_string()的函数,可将特殊字符和可能引起数据库操作出错的字符转义。
- +----------------------------------------------------------
- * 函数作用:检测提交的值是不是含有SQL注射的字符,防止注射,保护服务器安全
- +----------------------------------------------------------
- * @param mixed $sql_str: 提交的变量
- +----------------------------------------------------------
- * @return mixed 返回检测结果,ture or false
- +----------------------------------------------------------
- */
- function escapeMysql($el){
- if(is_array($el))
- {
- return array_map("escapeMysql", $el );
- }else{
- /*如果Magic Quotes功用启用 */
- if (!get_magic_quotes_gpc()) {
- $el = mysql_real_escape_string(trim($el));
- }
- $el = str_ireplace("%5d%5c", "'", $el);
- $el = str_replace("_", "\_", $el); // 把 '_'过滤掉
- $el = str_replace("%", "\%", $el); // 把 '%'过滤掉
- $el = nl2br($el); // 回车转换
- return $el;
- }
- }
- /**
- +----------------------------------------------------------
- * 变量过滤
- +----------------------------------------------------------
- * @param mixed $value 变量
- +----------------------------------------------------------
- * @return mixed
- +----------------------------------------------------------
- */
- function var_filter_deep($value) {
- return $value;
- if(is_array($value))
- {
- return $value = array_map("var_filter_deep", $value );
- }else{
- $value = RemoveXSS($value);
- //$value = inject_check($value);
- $value = escapeMysql($value);
- return $value;
- }
- }
- /*
- +----------------------------------------------------------
- * 函数名称:verify_id()
- +----------------------------------------------------------
- * 函数作用:校验提交的ID类值是否合法
- +----------------------------------------------------------
- * 参 数:$id: 提交的ID值
- +----------------------------------------------------------
- * 返 回 值:返回处理后的ID
- +----------------------------------------------------------
- */
- function verify_id($id=null) {
- if (!$id) { exit('没有提交参数!'); } // 是否为空判断
- elseif (inject_check($id)) { exit('提交的参数非法!'); } // 注射判断
- elseif (!is_numeric($id)) { exit('提交的参数非法!'); } // 数字判断
- $id = intval($id); // 整型化
- return $id;
- }
- /**
- +----------------------------------------------------------
- * 变量安全过滤
- +----------------------------------------------------------
- * @static
- * @access public
- +----------------------------------------------------------
- * @return string
- +----------------------------------------------------------
- */
- function varFilter ()
- {
- $_SERVER = array_map( "var_filter_deep", $_SERVER );
- $_REQUEST = array_map( "var_filter_deep", $_REQUEST);
- $_POST = array_map( "var_filter_deep", $_POST );
- $_GET = array_map( "var_filter_deep", $_GET );
- $_COOKIE = array_map( "var_filter_deep", $_COOKIE );
- //print_r($_POST);
- }
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