修改并执行以下程序即可获得Discuz 远程附件的FTP密码

<?php
$authkey=XXXXXXXXXXXXXXXXXXXX; //Setting表里有存,有备份数据的权限时候可以down回来看看
$discuz_auth_key = md5($authkey.$_SERVER[HTTP_USER_AGENT]);
$string=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX;//这个是Setting表里存放的FTP Password处的加密字符串
$password = authcode($string, DECODE, md5($authkey));
echo $password;
function authcode($string, $operation = DECODE, $key = , $expiry = 0) {
$ckey_length = 4;
$key = md5($key ? $key : $discuz_auth_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));
}

}
?>