How Do I Configure an AWS KMS Key With Pulumi?

Introduction

AWS Key Management Service (KMS) is a powerful tool for securely managing cryptographic keys in AWS. Pulumi, an infrastructure as code platform, simplifies the process of creating and managing AWS resources, including KMS keys, through code. This guide will walk you through the steps to configure an AWS KMS key using Pulumi, enabling you to encrypt and decrypt your data effectively.

Step-by-Step Configuration

To configure an AWS KMS key using Pulumi, follow these steps:

Define the KMS Key Policy: Start by specifying the key policy in JSON format. This policy dictates who can access and manage the KMS key.
Create the KMS Key: Use Pulumi to create an instance of the aws.kms.Key resource. This involves providing the key policy, a description, and enabling key rotation.
Export the KMS Key ARN: Finally, export the Amazon Resource Name (ARN) of the KMS key for future reference and use.

Below is a Pulumi program written in TypeScript that demonstrates these steps:

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Define the policy for the KMS key
const keyPolicy = JSON.stringify({
    Version: "2012-10-17",
    Statement: [
        {
            Sid: "Enable IAM User Permissions",
            Effect: "Allow",
            Principal: {
                AWS: "*"
            },
            Action: "kms:*",
            Resource: "*"
        },
        {
            Sid: "Allow access for Key Administrators",
            Effect: "Allow",
            Principal: {
                AWS: "arn:aws:iam::123456789012:role/KeyAdminRole"
            },
            Action: [
                "kms:Create*",
                "kms:Describe*",
                "kms:Enable*",
                "kms:List*",
                "kms:Put*",
                "kms:Update*",
                "kms:Revoke*",
                "kms:Disable*",
                "kms:Get*",
                "kms:Delete*",
                "kms:TagResource",
                "kms:UntagResource"
            ],
            Resource: "*"
        },
        {
            Sid: "Allow use of the key",
            Effect: "Allow",
            Principal: {
                AWS: "arn:aws:iam::123456789012:user/KeyUser"
            },
            Action: [
                "kms:Encrypt",
                "kms:Decrypt",
                "kms:ReEncrypt*",
                "kms:GenerateDataKey*",
                "kms:DescribeKey"
            ],
            Resource: "*"
        },
        {
            Sid: "Allow attachment of persistent resources",
            Effect: "Allow",
            Principal: {
                AWS: "arn:aws:iam::123456789012:user/KeyUser"
            },
            Action: [
                "kms:CreateGrant",
                "kms:ListGrants",
                "kms:RevokeGrant"
            ],
            Resource: "*",
            Condition: {
                Bool: {
                    "kms:GrantIsForAWSResource": "true"
                }
            }
        }
    ]
});

// Create the KMS key
const kmsKey = new aws.kms.Key("myKmsKey", {
    description: "My KMS Key for encrypting data",
    policy: keyPolicy,
    enableKeyRotation: true
});

// Export the ARN of the KMS key
export const kmsKeyArn = kmsKey.arn;

Key Points

Policy Definition: Clearly define the permissions and roles in the KMS key policy.
Key Creation: Use Pulumi to create and manage AWS resources, specifying necessary attributes like description and key rotation.
Resource Export: Exporting the ARN allows easy reference and integration with other AWS services.

Conclusion

In this guide, you learned how to configure an AWS KMS key using Pulumi. By defining a comprehensive key policy and leveraging Pulumi’s capabilities, you can manage your encryption keys effectively and securely. This setup not only enhances data security but also streamlines the management of cryptographic keys in your AWS environment.

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