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S3 SELECTでCloudTrail証跡オブジェクトを検索してみる

Last updated at Posted at 2021-02-10

S3 SELECTを使ってCloudTrailの証跡オブジェクト(JSONでS3に吐かれる)をクエリーする必要に迫られたが、意外にサンプルがなかったのでまとめておく。

やりたいこと

  • CloudTrailのファイルの中身をサクッと見たい。
  • ダウンロードはしたくない。Athenaを準備するほどでもない。

S3 SELECTの入出力設定

カテゴリー 項目
入力設定 フォーマット JSON
JSONコンテンツタイプ
圧縮 GZIP
出力設定 フォーマット JSON

サンプルクエリー

300行取得

SELECT * FROM s3object s LIMIT 300
指定したイベント情報を取得
SELECT s.eventTime, s.sourceIPAddress, s.userIdentity.arn, s.awsRegion, s.eventName, s.eventSource, s.eventType,s.eventCategory, s.errorCode, s.errorMessage FROM s3object[*].Records[*] s LIMIT 10
列名に別名を指定
SELECT s.eventTime as EventTime, s.sourceIPAddress as SourceIP, s.userIdentity.arn as UserID, s.userIdentity.sessionContext.attributes.mfaAuthenticated as MFA, s.eventName as EventName, s.eventSource as EventSource, s.errorCode as ErrorCode, s.errorMessage as ErrorMessage FROM s3object[*].Records[*] s LIMIT 10
特定のイベントソースのみフィルタリング
SELECT * FROM s3object[*].Records[*] s WHERE s.eventSource = 'ec2.amazonaws.com' AND s.eventName != 'DescribeInstances'
イベントを一覧表示して全体を把握
SELECT s.eventTime as EventTime, s.eventName as EventName, s.eventSource as EventSource FROM s3object[*].Records[*] s
特定のイベントソースのエラーの一覧化
SELECT s.eventTime as EventTime, s.sourceIPAddress as SourceIP, s.userIdentity.arn as UserID, s.errorCode as ErrorCode, s.errorMessage as ErrorMessage, s.eventName as EventName, s.eventSource as EventSource FROM s3object[*].Records[*] s WHERE s.eventSource = 'kinesis.amazonaws.com'
特定イベントの件数集計
SELECT count(s.eventName) as DynamoDBEventCount FROM s3object[*].Records[*] s WHERE s.eventSource = 'dynamodb.amazonaws.com'

メモ

  • 改行入れるとエラーになっちゃう。
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