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[JAWS-UG CLI] S3:#8 Trail用S3バケットの作成

Last updated at Posted at 2015-05-11

AWS CLIを利用して、CloudTrail用のS3バケットを作成してみます。

前提条件

S3への権限

  • S3に対してフル権限があること。

AWS CLIのバージョン

  • 以下のバージョンで動作確認済

    • AWS CLI 1.7.26
コマンド
aws --version
結果(例)
      aws-cli/1.7.26 Python/2.7.5 Darwin/13.4.0
  1. 準備
    =======

0.1. リージョンの決定

作成するS3バケットのリージョンを決めます。

(カレントユーザが利用するカレントリージョンも切り変わります。)

コマンド(アイルランドリージョンの場合)
export AWS_DEFAULT_REGION='eu-west-1'

0.2. 変数の確認

プロファイルとリージョンが想定のものになっていることを確認します。

変数の確認
aws configure list
結果(例)
            Name                    Value             Type    Location
            ----                    -----             ----    --------
         profile       s3Full-prjZ-mbp13iamFull-prjZ-mbp13              env    AWS_DEFAULT_PROFILE
      access_key     ****************XXXX shared-credentials-file
      secret_key     ****************XXXX shared-credentials-file
          region                eu-west-1              env    AWS_DEFAULT_REGION
  1. 事前作業
    ===========

1.1. AWS IDの取得

コマンド
AWS_ID=`aws iam get-user --query 'User.Arn' --output text | sed 's/^.*:://' | sed 's/:.*$//'` \
        && echo ${AWS_ID}
結果(例)
      XXXXXXXXXXXX
コマンド(IAMに権限が無い場合)
AWS_ID=`aws iam get-user --query 'User.Arn' --output text  2>&1 | sed 's/^.* User: arn:aws:iam:://' |sed 's/:.*$//' | tr -d '\n'` \
        && echo ${AWS_ID}
結果(例)
      XXXXXXXXXXXX

1.2. S3バケット名の決定

コマンド
S3_BUCKET_NAME="trail-${AWS_ID}-${AWS_DEFAULT_REGION}" \
        && echo ${S3_BUCKET_NAME}

バケット名が空いていることを確認します。

コマンド
aws s3 ls s3://${S3_BUCKET_NAME}
結果
      A client error (NoSuchBucket) occurred when calling the ListObjects operation: The specified bucket does not exist
  1. 本作業
    =========

2.1. S3バケットの作成

コマンド
cat << ETX

        S3_BUCKET_NAME: ${S3_BUCKET_NAME}

ETX
コマンド
aws s3 mb s3://${S3_BUCKET_NAME}
結果(例)
      make_bucket: s3://trail-XXXXXXXXXXXX-eu-west-1/

2.2. バケットポリシーファイルの作成

バケットポリシーファイルを作成します。

コマンド
FILE_S3_BUCKET_POLICY="BucketPolicy-CloudTrail-${AWS_DEFAULT_REGION}.json"
コマンド
cat << ETX

        FILE_S3_BUCKET_POLICY: ${FILE_S3_BUCKET_POLICY}
        S3_BUCKET_NAME:        ${S3_BUCKET_NAME}
        AWS_ID:                ${AWS_ID}

ETX
コマンド
cat << EOF > ${FILE_S3_BUCKET_POLICY}
{
          "Version": "2012-10-17",
          "Statement": [
              {
                  "Sid": "AWSCloudTrailAclCheck20131101",
                  "Effect": "Allow",
                  "Principal": {
                      "AWS": [
                          "arn:aws:iam::903692715234:root",
                          "arn:aws:iam::035351147821:root",
                          "arn:aws:iam::859597730677:root",
                          "arn:aws:iam::814480443879:root",
                          "arn:aws:iam::216624486486:root",
                          "arn:aws:iam::086441151436:root",
                          "arn:aws:iam::388731089494:root",
                          "arn:aws:iam::284668455005:root",
                          "arn:aws:iam::113285607260:root"
                      ]
                  },
                  "Action": "s3:GetBucketAcl",
                  "Resource": "arn:aws:s3:::${S3_BUCKET_NAME}"
              },
              {
                  "Sid": "AWSCloudTrailWrite20131101",
                  "Effect": "Allow",
                  "Principal": {
                      "AWS": [
                          "arn:aws:iam::903692715234:root",
                          "arn:aws:iam::035351147821:root",
                          "arn:aws:iam::859597730677:root",
                          "arn:aws:iam::814480443879:root",
                          "arn:aws:iam::216624486486:root",
                          "arn:aws:iam::086441151436:root",
                          "arn:aws:iam::388731089494:root",
                          "arn:aws:iam::284668455005:root",
                          "arn:aws:iam::113285607260:root"
                      ]
                  },
                  "Action": "s3:PutObject",
                  "Resource": "arn:aws:s3:::${S3_BUCKET_NAME}/AWSLogs/${AWS_ID}/*",
                  "Condition": {
                      "StringEquals": {
                          "s3:x-amz-acl": "bucket-owner-full-control"
                      }
                  }
              }
          ]
}
EOF

JSONファイルを作成したら、フォーマットが壊れてないか必ず確認します。

コマンド
jsonlint -q ${FILE_S3_BUCKET_POLICY}

2.3. バケットポリシーの適用

S3バケットにバケットポリシーを適用します。

コマンド
aws s3api put-bucket-policy \
        --bucket ${S3_BUCKET_NAME} \
        --policy file://${FILE_S3_BUCKET_POLICY}
結果
      (戻り値なし)

2.4. バケットポリシーの確認

コマンド
aws s3api get-bucket-policy --bucket ${S3_BUCKET_NAME} |\
        sed 's/\\//g' |\
        sed 's/"{/{/' |\
        sed 's/}"/}/' |\
        jq .
結果(例)
      {
        "Policy": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Sid": "AWSCloudTrailAclCheck20131101",
              "Effect": "Allow",
              "Principal": {
                "AWS": [
                  "arn:aws:iam::903692715234:root",
                  "arn:aws:iam::035351147821:root",
                  "arn:aws:iam::859597730677:root",
                  "arn:aws:iam::814480443879:root",
                  "arn:aws:iam::216624486486:root",
                  "arn:aws:iam::086441151436:root",
                  "arn:aws:iam::388731089494:root",
                  "arn:aws:iam::284668455005:root",
                  "arn:aws:iam::113285607260:root"
                ]
              },
              "Action": "s3:GetBucketAcl",
              "Resource": "arn:aws:s3:::trail-XXXXXXXXXXXX-eu-west-1"
            },
            {
              "Sid": "AWSCloudTrailWrite20131101",
              "Effect": "Allow",
              "Principal": {
                "AWS": [
                  "arn:aws:iam::903692715234:root",
                  "arn:aws:iam::035351147821:root",
                  "arn:aws:iam::859597730677:root",
                  "arn:aws:iam::814480443879:root",
                  "arn:aws:iam::216624486486:root",
                  "arn:aws:iam::086441151436:root",
                  "arn:aws:iam::388731089494:root",
                  "arn:aws:iam::284668455005:root",
                  "arn:aws:iam::113285607260:root"
                ]
              },
              "Action": "s3:PutObject",
              "Resource": "arn:aws:s3:::trail-XXXXXXXXXXXX-eu-west-1/AWSLogs/XXXXXXXXXXXX/*",
              "Condition": {
                "StringEquals": {
                  "s3:x-amz-acl": "bucket-owner-full-control"
                }
              }
            }
          ]
        }
      }

完了

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