This guide will walk you through setting up Terraform Cloud to inject a workload identity token and use it for OIDC-based authentication with the Infisical Terraform provider. You’ll start by creating a machine identity in Infisical, then configure Terraform Cloud to pass the injected token into your Terraform runs.
1

Create a Machine Identity in Infisical

Follow the instructions in this documentation to create a machine identity with OIDC auth. Infisical OIDC configuration values for Terraform Cloud:
  1. Set the OIDC Discovery URL to https://app.terraform.io.
  2. Set the Issuer to https://app.terraform.io.
  3. Configure the Audience to match the value you will use for TFC_WORKLOAD_IDENTITY_AUDIENCE in Terraform Cloud for the next step.
To view all possible claims available from Terraform cloud, visit HashiCorp’s documentation.
2

Enable Workload Identity Token Injection in Terraform Cloud

  1. Navigate to your workspace in Terraform Cloud.
  2. Add a workspace variable named TFC_WORKLOAD_IDENTITY_AUDIENCE:
  • Key: TFC_WORKLOAD_IDENTITY_AUDIENCE
  • Value: For example, my-infisical-audience
  • Category: Environment
Important:
  • The presence of TFC_WORKLOAD_IDENTITY_AUDIENCE is required for Terraform Cloud to inject a token.
  • If you are self-hosting HCP Terraform agents, ensure they are v1.7.0 or above.
Once set, Terraform Cloud will inject a workload identity token into the run environment as TFC_WORKLOAD_IDENTITY_TOKEN.
If you are running on self-hosted HCP Terraform agents, you must use v1.7.0 or later to enable token injection. If you need to generate multiple tokens, you must use v1.12.0 or later.
3

Configure the Infisical Provider

In your Terraform configuration, reference the injected token by name. For example:
provider "infisical" {
  host = "https://app.infisical.com"

  auth = {
    oidc = {
      identity_id = "<identity-id>"
      # This must match the environment variable Terraform injects:
      token_environment_variable_name = "TFC_WORKLOAD_IDENTITY_TOKEN"
    }
  }
}
  • host: Defaults to https://app.infisical.com. Override if using a self-hosted Infisical instance.
  • identity_id: The OIDC identity ID from Infisical.
  • token_environment_variable_name: Must match the injected variable name from Terraform Cloud. If using single token, use TFC_WORKLOAD_IDENTITY_TOKEN. If using multiple tokens, choose the one you want to use (e.g., TFC_WORKLOAD_IDENTITY_TOKEN_INFISICAL).
4

Validate Your Setup

  1. Run a plan and apply in Terraform Cloud.
  2. Verify the Infisical provider authenticates successfully without issues. If you run into authentication errors, double-check the Infisical identity has the correct roles/permissions in Infisical.