Terraform AWS KMS

This terraform module creates a KMS Customer Master Key (CMK) and its alias.

We eat, drink, sleep and most importantly love DevOps. We are working towards strategies for standardizing architecture while ensuring security for the infrastructure. We are strong believer of the philosophy Bigger problems are always solved by breaking them into smaller manageable problems. Resonating with microservices architecture, it is considered best-practice to run database, cluster, storage in smaller connected yet manageable pieces within the infrastructure.

This module is basically combination of Terraform open source and includes automatation tests and examples. It also helps to create and improve your infrastructure with minimalistic code instead of maintaining the whole infrastructure code yourself.

We have fifty plus terraform modules. A few of them are comepleted and are available for open source usage while a few others are in progress.

Prerequisites

This module has a few dependencies:

Examples

IMPORTANT: Since the master branch used in source varies based on new modifications, we suggest that you use the release versions here.

Simple Example

Here is an example of how you can use this module in your inventory structure:

  module "kms_key" {
    source      = "clouddrove/kms/aws"
    version     = "0.15.0"
    name        = "kms"
    environment = "test"
    label_order = ["name", "environment"]
    enabled     = true
    description             = "KMS key for cloudtrail"
    deletion_window_in_days = 7
    enable_key_rotation     = true
    alias                   = "alias/cloudtrail"
    policy                  = data.aws_iam_policy_document.default.json
  }

  data "aws_iam_policy_document" "default" {
    version = "2012-10-17"
    statement {
      sid    = "Enable IAM User Permissions"
      effect = "Allow"
      principals {
        type        = "AWS"
        identifiers = ["*"]
      }
      actions   = ["kms:*"]
      resources = ["*"]
    }
    statement {
      sid    = "Allow CloudTrail to encrypt logs"
      effect = "Allow"
      principals {
        type        = "Service"
        identifiers = ["cloudtrail.amazonaws.com"]
      }
      actions   = ["kms:GenerateDataKey*"]
      resources = ["*"]
      condition {
        test     = "StringLike"
        variable = "kms:EncryptionContext:aws:cloudtrail:arn"
        values   = ["arn:aws:cloudtrail:*:XXXXXXXXXXXX:trail/*"]
      }
    }

    statement {
      sid    = "Allow CloudTrail to describe key"
      effect = "Allow"
      principals {
        type        = "Service"
        identifiers = ["cloudtrail.amazonaws.com"]
      }
      actions   = ["kms:DescribeKey"]
      resources = ["*"]
    }

    statement {
      sid    = "Allow principals in the account to decrypt log files"
      effect = "Allow"
      principals {
        type        = "AWS"
        identifiers = ["*"]
      }
      actions = [
        "kms:Decrypt",
        "kms:ReEncryptFrom"
      ]
      resources = ["*"]
      condition {
        test     = "StringEquals"
        variable = "kms:CallerAccount"
        values = [
        "XXXXXXXXXXXX"]
      }
      condition {
        test     = "StringLike"
        variable = "kms:EncryptionContext:aws:cloudtrail:arn"
        values   = ["arn:aws:cloudtrail:*:XXXXXXXXXXXX:trail/*"]
      }
    }

    statement {
      sid    = "Allow alias creation during setup"
      effect = "Allow"
      principals {
        type        = "AWS"
        identifiers = ["*"]
      }
      actions   = ["kms:CreateAlias"]
      resources = ["*"]
    }
  }

Inputs

Name	Description	Type	Default	Required
alias	The display name of the alias. The name must start with the word `alias` followed by a forward slash.	`string`	`""`	no
attributes	Additional attributes (e.g. `1`).	`list(string)`	`[]`	no
customer_master_key_spec	Specifies whether the key contains a symmetric key or an asymmetric key pair and the encryption algorithms or signing algorithms that the key supports. Valid values: SYMMETRIC_DEFAULT, RSA_2048, RSA_3072, RSA_4096, ECC_NIST_P256, ECC_NIST_P384, ECC_NIST_P521, or ECC_SECG_P256K1. Defaults to SYMMETRIC_DEFAULT.	`string`	`"SYMMETRIC_DEFAULT"`	no
deletion_window_in_days	Duration in days after which the key is deleted after destruction of the resource.	`number`	`10`	no
description	The description of the key as viewed in AWS console.	`string`	`"Parameter Store KMS master key"`	no
enable_key_rotation	Specifies whether key rotation is enabled.	`string`	`true`	no
enabled	Specifies whether the kms is enabled or disabled.	`bool`	`true`	no
environment	Environment (e.g. `prod`, `dev`, `staging`).	`string`	`""`	no
is_enabled	Specifies whether the key is enabled.	`bool`	`true`	no
key_usage	Specifies the intended use of the key. Defaults to ENCRYPT_DECRYPT, and only symmetric encryption and decryption are supported.	`string`	`"ENCRYPT_DECRYPT"`	no
label_order	label order, e.g. `name`,`application`.	`list(any)`	`[]`	no
managedby	ManagedBy, eg 'CloudDrove'.	`string`	`"[email protected]"`	no
name	Name (e.g. `app` or `cluster`).	`string`	`""`	no
policy	A valid policy JSON document. For more information about building AWS IAM policy documents with Terraform.	`string`	`""`	no
repository	Terraform current module repo	`string`	`"https://github.com/clouddrove/terraform-aws-kms"`	no
tags	Additional tags (e.g. map(`BusinessUnit`,`XYZ`).	`map(string)`	`{}`	no

Outputs

Name	Description
alias_arn	Alias ARN.
alias_name	Alias name.
key_arn	Key ARN.
key_id	Key ID.
tags	A mapping of tags to assign to the resource.

Testing

In this module testing is performed with terratest and it creates a small piece of infrastructure, matches the output like ARN, ID and Tags name etc and destroy infrastructure in your AWS account. This testing is written in GO, so you need a GO environment in your system.

You need to run the following command in the testing folder:

  go test -run Test

Feedback

If you come accross a bug or have any feedback, please log it in our issue tracker, or feel free to drop us an email at [email protected].

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About us

At CloudDrove, we offer expert guidance, implementation support and services to help organisations accelerate their journey to the cloud. Our services include docker and container orchestration, cloud migration and adoption, infrastructure automation, application modernisation and remediation, and performance engineering.

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