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By defining both AWS accounts as Terraform providers, you can have Terraform manage this for you end-to-end. Remember this policy should be defined on the remote (delegated) AWS account, and thus attached to any IAM principal in that account where access is being granted.Īfter proving your setup by testing out your variation of the above policies, you can model this with Terraform. The bucket name can be between 3 and 63 characters long, and. Amazon S3 Inventory generates inventories of the objects in a bucket.
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In the Bucket name field we need to follow some guidelines. For more information about using a CSV manifest in the source or destination account, see Using a CSV manifest stored in the source account to copy objects across AWS accounts. Provide the bucket name must be globally unique across all existing bucket name in Amazon S3. Bucket like a folder that stores the objects. Such an IAM policy might look something like this. We can create up to 100 buckets in each of your AWS accounts. The specific principal referenced is the root user of that account, but this is effective for any IAM user/role on that account having access specifically granted via an IAM policy. In this example, read-only access to the bucket the-private-bucket is delegated to the AWS account 123456789012. The S3 bucket policy might look something like this.
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Because the S3 namespace is global, policies in the remote account can resolve the bucket by name. Lastly, the remote AWS account may then delegate access to its IAM users (or roles) by specifying the bucket name in a policy. First you create a trust relationship with the remote AWS account by specifying the account ID in the S3 bucket policy. It might not be immediately obvious the first time you do this, so this post is a bit of a primer on cross-account S3 access control, and implementing such with Terraform.Ĭonnecting a remote IAM principle to an S3 bucket involves two distinct steps. Whilst auditing a set of organizational AWS accounts, I wanted to consolidate operational S3 buckets into a single account and grant access as required. Terraform: Cross Account S3 Bucket Access Control Sat, Feb 24, 2018