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terraform で Error putting S3 policy: MalformedPolicy が出たときに確認したこと

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症状

こちらの投稿 を参考に
terraformで構築、と拡張していたところ、S3のポリシー関連でエラーが出るようになった

エラーメッセージ

Error: Error putting S3 policy: MalformedPolicy: Action does not apply to any resource(s) in statemen
	status code: 400, request id: hoge, host id: fuga

原因

aws_iam_policy_documentstatement resources に必要なARN指定が不足していた。

data "aws_iam_policy_document" "cf_to_s3_policy" {
  statement {
(中略)
    resources = [
      // "${aws_s3_bucket.image-bucket.arn}" の行が不要だと思って削除したが、実は必要だった
      "${aws_s3_bucket.image-bucket.arn}/testdir/*",
    ]
(中略)

修正後のソースコード

data "aws_iam_policy_document" "cf_to_s3_policy" {
  statement {
    actions = ["s3:GetObject", "s3:ListBucket"]

    resources = [
      "${aws_s3_bucket.image-bucket.arn}",
      "${aws_s3_bucket.image-bucket.arn}/*",
    ]

    principals {
      type        = "AWS"
      identifiers = ["${aws_cloudfront_origin_access_identity.origin_access_identity.iam_arn}"]
    }
  }
}

参考

https://qiita.com/natsumisawa/items/404217208ab1c96d8719
https://stackoverflow.com/questions/44228422/s3-bucket-action-doesnt-apply-to-any-resources

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