xdr-terraform-modules/base/phantom_s3_bucket/main.tf

locals {
  bucket_name  = "xdr-${var.splunk_prefix}-${var.environment}-phantom-archives"
  principals = [
    "arn:${var.aws_partition}:iam::${var.aws_account_id}:user/MDRAdmin",
    "arn:${var.aws_partition}:iam::${var.aws_account_id}:role/user/mdr_terraformer",
    aws_iam_role.phantom_s3_role.arn
  ]
}

resource "aws_s3_bucket" "bucket" {
  bucket = local.bucket_name
  acl    = "private"

  versioning {
    enabled = true
  }

  tags = merge(var.standard_tags, var.tags)

  lifecycle_rule {
    id      = "INTELLIGENT_TIERING"
    enabled = true

    abort_incomplete_multipart_upload_days = 2

    transition {
      days          = 30
      storage_class = "INTELLIGENT_TIERING"
    }

    transition {
      days          = 365
      storage_class = "DEEP_ARCHIVE"
    }

    expiration {
      days = 7*365
    }
  }

  server_side_encryption_configuration {
    rule {
      apply_server_side_encryption_by_default {
        kms_master_key_id = aws_kms_key.bucketkey.arn
        sse_algorithm     = "aws:kms"
      }
    }
  }
}

resource "aws_s3_bucket_public_access_block" "public_access_block" {
  bucket                  = aws_s3_bucket.bucket.id
  block_public_acls       = true
  block_public_policy     = true
  ignore_public_acls      = true
  restrict_public_buckets = true

  # Not technically dependent, but prevents a "Conflicting conditional operation" conflict.
  # See https://github.com/hashicorp/terraform-provider-aws/issues/7628
  depends_on = [aws_s3_bucket_policy.policy]
}

resource "aws_s3_bucket_policy" "policy" {
  depends_on = [ aws_iam_role.phantom_s3_role ]

  bucket = aws_s3_bucket.bucket.id

  policy = <<POLICY
{
  "Version": "2012-10-17",
  "Id": "AllowThisAccount",
  "Statement": [
    {
      "Sid": "AccountAllow",
      "Effect": "Allow",
      "Principal": {
        "AWS": ${ jsonencode(local.principals) }
      },
      "Action": [
        "s3:GetObject",
        "s3:ListBucket"
      ],
      "Resource": [
        "${aws_s3_bucket.bucket.arn}",
        "${aws_s3_bucket.bucket.arn}/*"
      ]
    }
  ]
}
POLICY
}