Terraform對S3存儲桶使用現有策略

Question

在我的terraform配置中，我有一個附加到某些roles的policy 。
創建s3存儲桶時如何重用此策略？

resource "aws_iam_policy" "s3-read-access" {
  name   = "my-warehouse-read-access"
  version = "2019-05-28"
  policy = "${data.aws_iam_policy_document.s3-read-access.json}"
}

resource "aws_s3_bucket" "my-warehouse" {
  bucket = "my-bucket"
  acl    = "private"
  policy = "${aws_iam_policy.s3-read-access.arn}"
}

不幸的是，我收到一個錯誤： Error putting S3 policy: MalformedPolicy: Policies must be valid JSON and the first byte must be '{' 。

似乎該policy需要在heredoc -notation中使用json配置，但是我必須重用現有策略。
如何在s3-bucket創建中引用該策略？

Answer 1

您可以通過多種方式實現這一目標。 您可以擁有策略JSON並在每個存儲桶中引用它：

resource "aws_s3_bucket" "b" {
  bucket = "s3-website-test.hashicorp.com"
  acl    = "public-read"
  policy = "${file("policy.json")}"
}

或者您可以創建一個數據塊：

data "aws_iam_policy_document" "your_super_amazing_policy" {
 count  = "${length(keys(var.statement))}"

  statement {
    sid       = "CloudfrontBucketActions"
    actions   = ["s3:GetObject"]
    resources = ["*"]
  }

而你在水桶上：

resource "aws_s3_bucket" "private_bucket" {
  bucket = "acme-private-bucket"
  acl = "private"
  policy = "${data.aws_iam_policy_document.your_super_amazing_policy.json}"

  tags {
    Name = "private-bucket"
    terraform = "true"
  }
}