terraform-secrets-helper

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Purpose and Functionality

This Terraform module provides a standard and extensible way of managing secrets from different sources, making them accessible through local.secrets["<SECRET_NAME>"]. It's designed to create an abstract interface for dealing with secrets in Terraform, regardless of the source of these secrets.

Our initial version is built to handle SOPS secrets, but it is designed in a way that it can be easily extended to support other secret providers like AWS SSM Parameter Store, Vault, and more in the future.

This module can be included as a child module, where needed, to fetch secrets and provide them in an abstract manner.

Usage

Copy exports/secrets.mixin.tf to your project by running the following command:

curl -sL https://raw.githubusercontent.com/masterpointio/terraform-secrets-helper/main/exports/secrets.mixin.tf -o secrets.mixin.tf

The mixin incorporates the invocation of this module, so you simply need to configure the required secret_mapping variable and then reference it within your code.

See the full example in examples/complete

SOPS Secrets

secret_mapping = [{
  name = "db_password"
  file = "test.yaml"
  type = "sops"
}]

output "db_password" {
  value     = jsonencode(local.secrets["db_password"])
  sensitive = true
}

AWS SSM Parameter Store Secrets

secret_mapping = [{
  name = "api_token"
  type = "ssm"
  path = "/myapp/prod/api_token"
}]

Mixed Sources

You can combine both SOPS and SSM secrets in the same configuration:

secret_mapping = [
  {
    name = "db_password"
    type = "sops"
    file = "secrets.yaml"
  },
  {
    name = "api_token"
    type = "ssm"
    path = "/myapp/prod/api_token"
  }
]

Future Enhancements

The module currently supports SOPS and AWS SSM Parameter Store. Future versions may add support for other secret providers like HashiCorp Vault, AWS Secrets Manager, and more.

Requirements

Name	Version
terraform	>= 1.3
aws	>= 4.0
sops	>= 0.7

Providers

Name	Version
aws	>= 4.0
sops	>= 0.7

Modules

No modules.

Resources

Name	Type
aws_ssm_parameter.ssm_secrets	data source
sops_file.sops_secrets	data source

Inputs

Name	Description	Type	Default	Required
secret_mapping	The list of secret mappings the application will need. This creates secret values for the component to consume at local.secrets[name]. For SOPS secrets: use type="sops" (default), file="path/to/sops/file.yaml", and name matching a key in the SOPS file. For SSM secrets: use type="ssm" and path="/path/to/ssm/parameter".	list(object({ name = string type = optional(string, "sops") path = optional(string, null) file = optional(string, null) }))	[]	no

Outputs

Name	Description
all	The final secrets pulled from various sources.

Built By

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Contributions are welcome and appreciated!

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License

Apache License, Version 2.0.

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