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我正在尝试使用 SQL 数据库中的 netflow 数据创建 DoS 检测程序。到目前为止,我对如何实现这一点有了大致的了解,但需要一些指导。

到目前为止的程序流程是:

<?php
$run = 'true';
$servername = "10.1.80.50";
$username = "netflow";
$password = "********";
$dbname = "netflow";
$flowQuery = 'SELECT distinct TIMESTAMP, SRCADDR, DSTADDR, SRCPORT, DSTPORT, PROT FROM netflow.flows ORDER BY DSTADDR ASC';

// Query flows for unique timed flows

$conn = mysqli_connect($servername, $username, $password, $dbname);
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}

$flows = mysqli_query($conn, $flowQuery);

// Begin creating baseline data

while ($run == 'true') {
    while($row = $flows->fetch_assoc()) {
        $baselineQuery = 'SELECT FROM_UNIXTIME((UNIX_TIMESTAMP(TIMESTAMP) div (5*60))*(5*60)+(5*60)) as timeIntervals, 
        ROUND(SUM(DPKTS),0) as PACKETDATA,
        MIN(DPKTS) AS MINPACKETS, 
        MAX(DPKTS) AS MAXPACKETS,
        ROUND(SUM(DOCTETS),0) as OCTETDATA,
        MIN(DOCTETS) AS MINOCTETS, 
        MAX(DOCTETS) AS MAXOCTETS
        FROM (
        SELECT FLOW_ID,TIMESTAMP,EXADDR,SRCADDR,DSTADDR,SRCPORT,DSTPORT,DPKTS,DOCTETS 
        FROM netflow.flows WHERE SRCADDR = "'.$row["SRCADDR"].'" AND DSTADDR = "'.$row["DSTADDR"].'" AND DSTPORT = "'.$row["DSTPORT"].'" AND SRCPORT = "'.$row["SRCPORT"].'" AND PROT = "'.$row["PROT"].'" 
        ORDER BY FLOW_ID DESC LIMIT 500
        ) AS custom
        GROUP BY 1 ORDER BY timeIntervals DESC 
        LIMIT 240';
    $baselines = mysqli_query($conn, $baselineQuery);
    }        
usleep(60000000);
}

print_r($baselines);

?>

我的逻辑是:

  1. 查找过去 8 小时内的所有唯一流。
  2. 使用此数据查找这些唯一流中的每一个的所有流数据。
  3. 将创建的数组拆分为每个流的子数组或单独的数组。
  4. 一旦每个流都有自己的数组,平均数据包和数据以获得伪基线。
  5. 将最新的流量条目与这些平均值进行比较,并确定是否存在异常(一个方向的数据流增加/减少超过 200%)。
  6. 如果检测到异常,请发送一封有关该事件的电子邮件警报。
  7. 等待 60 秒并恢复循环。

我知道代码远未完成,可能非常草率,但非常感谢任何帮助!

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