过滤XSS攻击和SQL注入函数

xiaoxiao2022-07-15 138

/** +---------------------------------------------------------- * 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("]\", "'", $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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