class SafeSqlUtil
{
/**
* 对字段两边加反引号，以保证数据库安全
* @param $value 数组值
*/
public function add_special_char(&$value)
{
if ('*' == $value || false !== strpos($value, '(') || false !== strpos($value, '.') || false !== strpos($value, '`')) {
//不处理包含* 或者 使用了sql方法。
} else {
$value = '`' . trim($value) . '`';
}
return $value;
}
}
'table|td|th|tr|i|b|u|strong|img|p|br|div|strong|em|ul|ol|li|dl|dd|dt|a',
'ban' => 'html|head|meta|link|base|basefont|body|bgsound|title|style|script|form|iframe|frame|frameset|applet|id|ilayer|layer|name|script|style|xml',
];
/**
* 安全过滤函数
*
* @param $string
* @return string
*/
public function safe_replace($string)
{
$string = str_replace('%20', '', $string);
$string = str_replace('%27', '', $string);
$string = str_replace('%2527', '', $string);
$string = str_replace('*', '', $string);
$string = str_replace('"', '"', $string);
$string = str_replace("'", '', $string);
$string = str_replace('"', '', $string);
$string = str_replace(';', '', $string);
$string = str_replace('<', '<', $string);
$string = str_replace('>', '>', $string);
$string = str_replace("{", '', $string);
$string = str_replace('}', '', $string);
$string = str_replace('', '', $string);
return $string;
}
/**
* 返回经addslashes处理过的字符串或数组
* @param $string 需要处理的字符串或数组
* @return string||array
*/
public function new_addslashes($string)
{
if (!is_array($string)) return addslashes($string);
foreach ($string as $key => $val) {
$string[$key] = $this->new_addslashes($val);
}
return $string;
}
/**
* 对请求的字符串进行安全处理
*
* @param [type] $str
* @param integer $safestep
* 0 为不处理，
* 1 为禁止不安全HTML内容(javascript等)，
* 2 完全禁止HTML内容，并替换部份不安全字符串（如：eval(、union、CONCAT(、--、等）
* @return string
*/
public function StringSafe($str, $safestep = -1)
{
$safestep = ($safestep > -1) ? $safestep : 1;
if ($safestep == 1) {
$str = preg_replace("#script:#i", "ｓｃｒｉｐｔ：", $str);
$str = preg_replace("#<[/]{0,1}(link|meta|ifr|fra|scr)[^>]*>#isU", '', $str);
$str = preg_replace("#[ ]{1,}#", ' ', $str);
return $str;
} else if ($safestep == 2) {
$str = addslashes(htmlspecialchars(stripslashes($str)));
$str = preg_replace("#eval#i", 'ｅｖａｌ', $str);
$str = preg_replace("#union#i", 'ｕｎｉｏｎ', $str);
$str = preg_replace("#concat#i", 'ｃｏｎｃａｔ', $str);
$str = preg_replace("#--#", '－－', $str);
$str = preg_replace("#[ ]{1,}#", ' ', $str);
return $str;
} else {
return $str;
}
}
public function RemoveXSS($val)
{
// remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed
// this prevents some character re-spacing such as
// note that you have to handle splits with , , and 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 )
$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 , , and
$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[$i], 0, 2) . '' . substr($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;
}
/**
* 输出安全的html，用于过滤危险代码
* @access public
* @param string $text 要处理的字符串
* @param mixed $tags 允许的标签列表，如 table|td|th|td
* @return string
*/
public function safeHtml($text, $allowTags = null, $banTag = null)
{
$text = trim($text);
//完全过滤注释
$text = preg_replace('//', '', $text);
//完全过滤动态代码
$text = preg_replace('/<\?|\?' . '>/', '', $text);
//完全过滤js
$text = preg_replace('//', '', $text);
$text = str_replace('[', '[', $text);
$text = str_replace(']', ']', $text);
$text = str_replace('|', '|', $text);
//过滤换行符
$text = preg_replace('/\r?\n/', '', $text);
//br
$text = preg_replace('//i', '[br]', $text);
$text = preg_replace('/(\[br\]\s*){10,}/i', '[br]', $text);
//过滤危险的属性，如：过滤on事件lang js
while (preg_match('/(<[^><]+)(lang|on|action|background|codebase|dynsrc|lowsrc)[^><]+/i', $text, $mat)) {
$text = str_replace($mat[0], $mat[1], $text);
}
while (preg_match('/(<[^><]+)(window\.|javascript:|js:|about:|file:|document\.|vbs:|cookie)([^><]*)/i', $text, $mat)) {
$text = str_replace($mat[0], $mat[1] . $mat[3], $text);
}
if (empty($allowTags)) {
$allowTags = self::$htmlTags['allow'];
}
//允许的HTML标签
$text = preg_replace('/<(' . $allowTags . ')( [^><\[\]]*)>/i', '[\1\2]', $text);
//过滤多余html
if (empty($banTag)) {
$banTag = self::$htmlTags['ban'];
}
$text = preg_replace('/<\/?(' . $banTag . ')[^><]*>/i', '', $text);
//过滤合法的html标签
while (preg_match('/<([a-z]+)[^><\[\]]*>[^><]*<\/\1>/i', $text, $mat)) {
$text = str_replace($mat[0], str_replace('>', ']', str_replace('<', '[', $mat[0])), $text);
}
//转换引号
while (preg_match('/(\[[^\[\]]*=\s*)(\"|\')([^\2=\[\]]+)\2([^\[\]]*\])/i', $text, $mat)) {
$text = str_replace($mat[0], $mat[1] . '|' . $mat[3] . '|' . $mat[4], $text);
}
//空属性转换
$text = str_replace('\'\'', '||', $text);
$text = str_replace('""', '||', $text);
//过滤错误的单个引号
while (preg_match('/\[[^\[\]]*(\"|\')[^\[\]]*\]/i', $text, $mat)) {
$text = str_replace($mat[0], str_replace($mat[1], '', $mat[0]), $text);
}
//转换其它所有不合法的 < >
$text = str_replace('<', '<', $text);
$text = str_replace('>', '>', $text);
$text = str_replace('"', '"', $text);
//反转换
$text = str_replace('[', '<', $text);
$text = str_replace(']', '>', $text);
$text = str_replace('|', '"', $text);
//过滤多余空格
$text = str_replace(' ', ' ', $text);
return $text;
}
}
