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Fluentd

Fluentdは、汎用で軽量なデータ集約および転送メカニズムとして機能するオープンソースのデータ収集ソフトウェアです。Wallarm Consoleで適切な連携を作成することで、検出イベントの通知をFluentdに送信するようにWallarmを設定できます。

通知の形式

Wallarmはwebhooksを介してJSON形式の通知をFluentdに送信します。含まれるJSONオブジェクトは、Wallarmが通知するイベントによって異なります。

新しいヒット検出の通知例：

[
    {
        "summary": "[Wallarm] New hit detected",
        "details": {
        "client_name": "TestCompany",
        "cloud": "EU",
        "notification_type": "new_hits",
        "hit": {
            "domain": "www.example.com",
            "heur_distance": 0.01111,
            "method": "POST",
            "parameter": "SOME_value",
            "path": "/news/some_path",
            "payloads": [
                "say ni"
            ],
            "point": [
                "post"
            ],
            "probability": 0.01,
            "remote_country": "PL",
            "remote_port": 0,
            "remote_addr4": "8.8.8.8",
            "remote_addr6": "",
            "tor": "none",
            "request_time": 1603834606,
            "create_time": 1603834608,
            "response_len": 14,
            "response_status": 200,
            "response_time": 5,
            "stamps": [
                1111
            ],
            "regex": [],
            "stamps_hash": -22222,
            "regex_hash": -33333,
            "type": "sqli",
            "block_status": "monitored",
            "id": [
                "hits_production_999_202010_v_1",
                "c2dd33831a13be0d_AC9"
            ],
            "object_type": "hit",
            "anomaly": 0
            }
        }
    }
]

要件

Fluentdの構成は次の要件を満たす必要があります。

  • POSTまたはPUTリクエストを受け付けます

  • HTTPSリクエストを受け付けます

  • パブリックにアクセス可能なURLがあります

Fluentd構成例：

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<source>
  @type http # HTTP/HTTPSトラフィック用のinputプラグイン
  port 9880 # 受信リクエスト用のポート
  <transport tls> # 接続処理の設定
    cert_path /etc/ssl/certs/fluentd.crt
    private_key_path /etc/ssl/private/fluentd.key
  </transport>
</source>
<match **>
  @type copy
  <store>
     @type stdout # Fluentdのログをコマンドラインに出力する出力プラグイン
     output_type json # コマンドラインに出力されるログの形式
  </store>
</match>

詳細は公式Fluentdドキュメントを参照してください。

連携の設定

  1. Wallarm Console→Integrations→FluentdでFluentd連携の設定に進みます。

  2. 連携名を入力します。

  3. 送信先FluentdのURL（Webhook URL）を指定します。

  4. 必要に応じて、詳細設定を構成します：

    • Request method: POST or PUT. By default, POST requests are sent.
    • Request header and its value if the server requires a non-standard header to execute the request. The number of headers is not limited.
    • CA certificate: certificate of CA that signed a server certificate. If CA is publicly trusted, this field is optional. If a server certificate is self-signed, this field is required and must contain a certificate of your own CA that signed a server certificate.
    • Verify TLS certificate: this setting allows to disable verification of the specified server certificate. By default, Wallarm verifies whether a server certificate is signed by a publicly trusted CA. We do not recommend disabling the verification of production server certificates. If your server uses a self-signed TLS certificate, you can add a self-signed CA certificate to allow sending requests to this server.
    • Request timeout, in seconds: if the server does not respond to the request within the specified time, the request fails. By default: 15 seconds.
    • Connection timeout, in seconds: if the connection to the server cannot be established during the specified time, the request fails. By default: 20 seconds.
    • Wallarm data format: either a JSON Array (default) or a New Line Delimited JSON (NDJSON).

  5. 通知をトリガーするイベント種別を選択します。

    Fluentd連携

    利用可能なイベントの詳細：

    • Hits detected except for:

    • System related:

    • Vulnerabilities detected, all by default or only for the selected risk level(s) - high, medium or low.
    • Rules and triggers changed (creating, updating, or deleting the rule or trigger)
    • (Requires AASM Enterprise) Security issues detected, all or only for the selected risk level(s):
      • Critical risk
      • High risk
      • Medium risk
      • Low risk
      • Info risk
    • On an hourly basis, you can get a notification with the number of requests processed during the previous hour

  6. Test integrationをクリックして、構成が正しいこと、Wallarm Cloudの可用性、および通知の形式を確認します。

    テスト用Fluentdログ：

    [
    {
        summary:"[Test message] [Test partner(US)] New vulnerability detected",
        description:"Notification type: vuln

                    New vulnerability was detected in your system.

                    ID: 
                    Title: Test
                    Domain: example.com
                    Path: 
                    Method: 
                    Discovered by: 
                    Parameter: 
                    Type: Info
                    Threat: Medium

                    More details: https://us1.my.wallarm.com/object/555


                    Client: TestCompany
                    Cloud: US
                    ",
        details:{
            client_name:"TestCompany",
            cloud:"US",
            notification_type:"vuln",
            vuln_link:"https://us1.my.wallarm.com/object/555",
            vuln:{
                domain:"example.com",
                id:null,
                method:null,
                parameter:null,
                path:null,
                title:"Test",
                discovered_by:null,
                threat:"Medium",
                type:"Info"
            }
        }
    }
]

  7. Add integrationをクリックします。

Wallarm Cloud IP addresses

To provide Wallarm Cloud access to your system, you may need a list of its public IP addresses:

35.235.66.155
34.102.90.100
34.94.156.115
35.235.115.105
34.94.85.217
34.94.51.234
34.102.59.122
34.94.238.72
35.235.100.79
34.102.45.38
34.94.241.21
34.102.90.100
34.94.203.193
34.94.238.221
34.94.9.23

34.141.230.156
34.91.138.113
34.90.114.134
35.204.127.78
34.90.24.155

追加アラートの設定

Besides the notifications you have already set up through the integration card, Wallarm triggers allow you to select additional events for notifications:

For condition detailing, you can add one or more filters. As soon, as condition and filters are set, select the integration through which the selected alert should be sent. You can select several integrations simultaneously.

Choosing an integration

中間データコレクターとしてFluentdを使用する

The most common logging scheme in complex systems consists of the following components:

  • Data collector: accepts logs from several sources and forwards logs to the SIEM system

  • SIEM system or log management systems: used to analyze logs and monitor the system status

例：

Webhookのフロー

この方式でWallarmのイベントを記録するには：

  1. データコレクターが受信webhookを読み取り、次のシステムにログを転送するように構成します。Wallarmはwebhookでデータコレクターにイベントを送信します。

  2. SIEMシステムがデータコレクターからログを取得して読み取れるように構成します。

  3. Wallarmがデータコレクターにログを送信するように構成します。

    Wallarmはwebhook経由で任意のデータコレクターにログを送信できます。

    WallarmをFluentdまたはLogstashと連携するには、Wallarm Console UIの対応するintegration cardsを使用できます。

    その他のデータコレクターと連携するには、Wallarm Console UIのwebhook integration cardを使用できます。

SIEMシステムにログを転送する一般的なデータコレクターとの連携設定例をいくつか紹介します：

連携の無効化と削除

You can delete or temporarily disable the integration. While deleting stops sending notificatioins and completely deletes all configuration, disabling just stops sending notifications which you can at any moment re-enable with the same settings.

If for the integration the System related events are selected to trigger notifications, Wallarm will notify about both of these actions.

システムの利用不可および連携パラメータの誤り

Notifications to the system are sent via requests. If the system is unavailable or integration parameters are configured incorrectly, the error code is returned in the response to the request.

If the system responds to Wallarm request with any code other than 2xx, Wallarm resends the request with the interval until the 2xx code is received:

  • The first cycle intervals: 1, 3, 5, 10, 10 seconds

  • The second cycle intervals: 0, 1, 3, 5, 30 seconds

  • The third cycle intervals: 1, 1, 3, 5, 10, 30 minutes

If the percentage of unsuccessful requests reaches 60% in 12 hours, the integration is automatically disabled. If you receive system notifications, you will get a message about automatically disabled integration.