UCenter防止恶意访问（安全加固）

功能说明：uc_server/consoler.php是ucenter默认的后台地址，正常情况下可以直接访问，为了防止某些恶意访问的情况，可以修改以下内容进行安全性能提升。
适用版本：Discuz!x1-x3.4适用情况：ucenter在论坛根目录下
修改后效果：未登录Discuz论坛或不在指定的管理组，打开uc_server/consoler.php提示404
原帖地址：转载请注明出处，谢谢！
具体实施方案：
打开uc_server/model/admin.php
搜索
$this->cookie_status = isset($_COOKIE['sid']) ? 1 : 0;在下面加入以下代码
if(!$this->cookie_status){
      include UC_ROOT.'../config/config_global.php';
      $cookiepre = $_config['cookie']['cookiepre'].substr(md5($_config['cookie']['cookiepath'].'|'.$_config['cookie']['cookiedomain']), 0, 4).'_';
      $auth = addslashes($_COOKIE[$cookiepre.'auth']);
      if(empty($_config['cookie']['saltkey'])) {
        $_config['cookie']['saltkey'] = addslashes($_COOKIE[$cookiepre.'saltkey']);
      }
      $authkey = md5($_config['security']['authkey'].$_config['cookie']['saltkey']);
      $auth = daddslashes(explode("\t", $this->dauthcode($auth, 'DECODE',$authkey)));
      list($discuz_pw, $discuz_uid) = empty($auth) || count($auth) < 2 ? array('', '') : $auth;
      $discuz_uid = intval($discuz_uid);
      $groupid = $this->db->result_first("SELECT groupid FROM ".$_config['db'][1]['tablepre']."common_member WHERE uid='$discuz_uid'");
      if(!in_array($groupid,array('1','2'))){
         header("HTTP/1.1 404 Not Found");header("Status: 404 Not Found");exit;
      }
    }其中这里增加用户组：array('1','2')
搜索function __construct() {
    $this->adminbase();
  }后面加入function dauthcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
    $ckey_length = 4;
    $key = md5($key );
    $keya = md5(substr($key, 0, 16));
    $keyb = md5(substr($key, 16, 16));
    $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';

    $cryptkey = $keya.md5($keya.$keyc);
    $key_length = strlen($cryptkey);

    $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
    $string_length = strlen($string);

    $result = '';
    $box = range(0, 255);

    $rndkey = array();
    for($i = 0; $i <= 255; $i++) {
      $rndkey[$i] = ord($cryptkey[$i % $key_length]);
    }

    for($j = $i = 0; $i < 256; $i++) {
      $j = ($j + $box[$i] + $rndkey[$i]) % 256;
      $tmp = $box[$i];
      $box[$i] = $box[$j];
      $box[$j] = $tmp;
    }

    for($a = $j = $i = 0; $i < $string_length; $i++) {
      $a = ($a + 1) % 256;
      $j = ($j + $box[$a]) % 256;
      $tmp = $box[$a];
      $box[$a] = $box[$j];
      $box[$j] = $tmp;
      $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
    }

    if($operation == 'DECODE') {
      if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
        return substr($result, 26);
      } else {
        return '';
      }
    } else {
      return $keyc.str_replace('=', '', base64_encode($result));
    }

  }修改好的下载地址：https://www.discuzlab.com/thread-56805-1-1.html