This data source can be used to fetch information about a specific IAM role. By using this data source, you can reference IAM role properties without having to hard code ARNs as input.
data "aws_iam_role" "example" {
name = "an_example_role_name"
}
name - (Required) The friendly IAM role name to match. id - The friendly IAM role name to match. arn - The Amazon Resource Name (ARN) specifying the role. assume_role_policy - The policy document associated with the role. path - The path to the role. unique_id - The stable and unique string identifying the role.
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https://www.terraform.io/docs/providers/aws/d/iam_role.html