[Enhancement]: add attribute `kms_key_id` to data `aws_kinesis_stream`

[GuillaumeDesforges]

Description

The resource aws_kinesis_stream can use encryption with a KMS key with

resource "aws_kinesis_stream" "this" {
    ...
    encryption_type = "KMS"
    kms_key_id = ...
}

See kms_key_id

However it is not possible to fetch that key ID using the equivalent data source. See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/kinesis_stream#attribute-reference

For example, this makes it impossible to properly define a kms:Decrypt policy to the specific key for a lambda with a trigger from Kinesis.

# Allow lambda to decrypt Kinesis stream data
data "aws_kms_key" "kinesis" {
    key_id = data.kinesis_stream.kms_key_id  # <== NOT POSSIBLE TODAY
}

data "aws_iam_policy_document" "decrypt" {
    statement {
        effect = "Allow"
        actions = [
            "kms:Decrypt",
        ]
        resources = [data.aws_kms_key.kinesis.arn] # <== WHAT I NEED
    }
}

My current workaround is to put the ARN manually, which defeats the purpose of IaC.

Affected Resource(s) and/or Data Source(s)

data.aws_kinesis_stream

Potential Terraform Configuration

# Allow lambda to decrypt Kinesis stream data
data "aws_kms_key" "kinesis" {
    key_id = data.kinesis_stream.kms_key_id  # <== NOT POSSIBLE TODAY
}

data "aws_iam_policy_document" "decrypt" {
    statement {
        effect = "Allow"
        actions = [
            "kms:Decrypt",
        ]
        resources = [data.aws_kms_key.kinesis.arn] # <== WHAT I NEED
    }
}

References

https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/kinesis_stream

Would you like to implement a fix?

Yes

[github-actions[bot]]

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[github-actions[bot]]

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[github-actions[bot]]

This functionality has been released in v5.67.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!