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PHP防注入函数代码总结

Jun 13, 2016 am 10:12 AM
php generally code overall situation function exist string Summarize document injection of filter

在php中防注入一般会写一个全局文件用来过滤特殊的字符串,本文章来总结了各种各样的php防注入函数代码,同时还可防sql注入大家可参考。

为了安全,我们常用到下面的函数来过滤一些传递过来的非法字符:

PHP防注入函数

 代码如下 复制代码

//要过滤的非法字符
$ArrFiltrate=array(“‘”,”;”,”union”,”select”,”delete”,”‘”,”or”,”and”,”=”);
//出错后要跳转的url,不填则默认前一页
$StrGoUrl=”";
//是否存在数组中的值
function FunStringExist($StrFiltrate,$ArrFiltrate){
foreach ($ArrFiltrate as $key=>$value){
if (eregi($value,$StrFiltrate)){
return true;
}
}
return false;
}
//合并$_POST 和 $_GET
if(function_exists(array_merge)){
$ArrPostAndGet=array_merge($HTTP_POST_VARS,$HTTP_GET_VARS);
}else{
foreach($HTTP_POST_VARS as $key=>$value){
$ArrPostAndGet[]=$value;
}
foreach($HTTP_GET_VARS as $key=>$value){
$ArrPostAndGet[]=$value;
}
}
//验证开始
foreach($ArrPostAndGet as $key=>$value){
if (FunStringExist($value,$ArrFiltrate)){
if (empty($StrGoUrl)){
echo “”;
}else{
echo “”;
}
exit;
}
}

再看一个实例与上面差不多,这个是dz论坛使用的方法

 代码如下 复制代码

 

$magic_quotes_gpc = get_magic_quotes_gpc();
@extract(daddslashes($_COOKIE));
@extract(daddslashes($_POST));
@extract(daddslashes($_GET));
if(!$magic_quotes_gpc) {
$_FILES = daddslashes($_FILES);
}


function daddslashes($string, $force = 0) {
if(!$GLOBALS['magic_quotes_gpc'] || $force) {
if(is_array($string)) {
foreach($string as $key => $val) {
$string[$key] = daddslashes($val, $force);
}
} else {
$string = addslashes($string);
}
}
return $string;
}

最后发一加强版的

 代码如下 复制代码

$field = explode(',', $data);
array_walk($field, array($this, 'add_special_char'));
$data = implode(',', $field);
/**
 * 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 $value;
}
function str_filter($str) {
 $str = htmlspecialchars ( $str );
 if (! get_magic_quotes_gpc ()) {
  $str = addslashes ( $str );
 }
 //过滤危险字符
 return preg_replace ( "/["'=]|(and)|(or)|(create)|(update)|(alter)|(delete)|(insert)|(load_file)|(outfile)|(count)|(%20)|(char)/i", "", $str );
}
/*
函数名称:str_check()
函数作用:对提交的字符串进行过滤
参  数:$var: 要处理的字符串
返 回 值:返回过滤后的字符串
*/
function str_check($str) {
 if (! get_magic_quotes_gpc ()) { // 判断magic_quotes_gpc是否打开
  $str = addslashes ( $str ); // 进行过滤
 }
 $str = str_replace ( "_", "_", $str ); // 把 '_'过滤掉
 $str = str_replace ( "%", "%", $str ); // 把 '%'过滤掉
 return $str;
}

/*
函数名称:post_check()
函数作用:对提交的编辑内容进行处理
参  数:$post: 要提交的内容
返 回 值:$post: 返回过滤后的内容
*/
function post_check($post) {
 if (! get_magic_quotes_gpc ()) { // 判断magic_quotes_gpc是否为打开
  $post = addslashes ( $post ); // 进行magic_quotes_gpc没有打开的情况对提交数据的过滤
 }
 $post = str_replace ( "_", "_", $post ); // 把 '_'过滤掉
 $post = str_replace ( "%", "%", $post ); // 把 '%'过滤掉
 $post = nl2br ( $post ); // 回车转换
 $post = htmlspecialchars ( $post ); // html标记转换
 return $post;
}
/*
函数名称:inject_check()
函数作用:检测提交的值是不是含有SQL注射的字符,防止注射,保护服务器安全
参  数:$sql_str: 提交的变量
返 回 值:返回检测结果,ture or false
*/
function inject_check($sql_str) {
 return eregi('select|insert|and|or|update|delete|'|/*|*|../|./|union|into|load_file|outfile', $sql_str);     // 进行过滤
}

/*
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;
}

// $rptype = 0 表示仅替换 html标记
// $rptype = 1 表示替换 html标记同时去除连续空白字符
// $rptype = 2 表示替换 html标记同时去除所有空白字符
// $rptype = -1 表示仅替换 html危险的标记
function HtmlReplace($str, $rptype = 0) {
 $str = stripslashes ( $str );
 if ($rptype == 0) {
  $str = htmlspecialchars ( $str );
 } else if ($rptype == 1) {
  $str = htmlspecialchars ( $str );
  $str = str_replace ( " ", ' ', $str );
  $str = ereg_replace ( "[rnt ]{1,}", ' ', $str );
 } else if ($rptype == 2) {
  $str = htmlspecialchars ( $str );
  $str = str_replace ( " ", '', $str );
  $str = ereg_replace ( "[rnt ]", '', $str );
 } else {
  $str = ereg_replace ( "[rnt ]{1,}", ' ', $str );
  $str = eregi_replace ( 'script', 'script', $str );
  $str = eregi_replace ( "]*>", '', $str );
 }
 return addslashes ( $str );
}
//递归ddslashes
function daddslashes($string, $force = 0, $strip = FALSE) {
 if (! get_magic_quotes_gpc () || $force) {
  if (is_array ( $string )) {
   foreach ( $string as $key => $val ) {
    $string [$key] = daddslashes ( $val, $force );
   }
  } else {
   $string = addslashes ( $strip ? stripslashes ( $string ) : $string );
  }
 }
 return $string;
}

//递归stripslashes
function dstripslashes($string) {
 if (is_array ( $string )) {
  foreach ( $string as $key => $val ) {
   $string [$key] = $this->dstripslashes ( $val );
  }
 } else {
  $string = stripslashes ( $string );
 }
 return $string;
}
/**
 * 安全过滤函数
 * @param $string 要过滤的字符串
 * @return string 返回处理过的字符串
 */
function safe_replace($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('  $string = str_replace("{",'',$string);
 $string = str_replace('}','',$string);
 return $string;
}

/**
 * 使用htmlspecialchars处理字符串或数组
 * @param $obj 需要处理的字符串或数组
 * @return mixed 返回经htmlspecialchars处理过的字符串或数组
 */
function new_htmlspecialchars($string) {
 if(!is_array($string))
 return htmlspecialchars($string);
 foreach($string as $key => $val)
 $string[$key] = new_htmlspecialchars($val);
 return $string;
}

//处理禁用HTML但允许换行的内容
function TrimMsg($msg) {
 $msg = trim ( stripslashes ( $msg ) );
 $msg = nl2br ( htmlspecialchars ( $msg ) );
 $msg = str_replace ( "  ", "  ", $msg );
 return addslashes ( $msg );
}

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