dedecms 空间存储型xss分析

else if($fmdo=='moodmsg')
{
    //用户登录
    if($dopost=="sendmsg")
    {
        if(!empty($content))
        {
        $ip = GetIP();
        $dtime = time();
          $ischeck = ($cfg_mb_msgischeck == 'Y')? 0 : 1;
          if($cfg_soft_lang == 'gb2312')
          {
              $content = utf82gb(nl2br($content));
          } 
          $content = cn_substrR(HtmlReplace($content,1),360);  //对内容进行处理 -> 看看 HtmlReplace函数
          //对表情进行解析
          $content = addslashes(preg_replace("/[face:(d{1,2})]/is","<img src='".$cfg_memberurl."/templets/images/smiley/\1.gif' style='cursor: pointer; position: relative;'>",$content));
          省略...

function HtmlReplace($str,$rptype=0)
    {
        $str = stripslashes($str); //函数删除由 addslashes() 函数添加的反斜杠
                $str = preg_replace("/<[/]{0,1}style([^>]*)>(.*)</style>/i", '', $str);//2011-06-30 禁止会员投稿添加css样式 (by:织梦的鱼)
        if($rptype==0)
        {
            $str = htmlspecialchars($str);
        }
        else if($rptype==1)
        {
            $str = htmlspecialchars($str); //预定义的字符转换为 HTML 实体
            $str = str_replace("　", ' ', $str);
            $str = preg_replace("/[rnt ]{1,}/", ' ', $str);
        }
        else if($rptype==2)
        {
            $str = htmlspecialchars($str);
            $str = str_replace("　", '', $str);
            $str = preg_replace("/[rnt ]/", '', $str);
        }
        else
        {
            $str = preg_replace("/[rnt ]{1,}/", ' ', $str);
            $str = preg_replace('/script/i', 'ｓｃｒｉｐｔ', $str);
            $str = preg_replace("/<[/]{0,1}(link|meta|ifr|fra)[^>]*>/i", '', $str);
        }
        return addslashes($str);
    }

function JstrimJajxLog($str,$len)
{
    $str = cn_substr($str,$len);
    $str = str_replace(''', '"', $str);
    $str = str_replace('&amp;lt;', '<', $str);
    $str = str_replace('&amp;gt;', '>', $str);
    return $str;
}