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This guide is to help you connect to Vault with OIDC.

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Overview

This guide will show you how to create a JWT Authentication Method, and how to configure env zero to utilize OIDC to authenticate to your vault cluster to retrieve secrets. Refer to env zero’s OIDC configuration. We are going to follow the Vault documentation on how to create a JWT Authentication

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JWT Authentication Method

  1. Login to your vault cluster
  2. In the side navigation bar click on Access
  3. Choose Authentication Methods in the left side menu
  4. Click on the Enable new method button and it will open the Authentication method creation wizard
  5. Choose JWT
  6. Expand Method Options add a description and the relevant configuration and click on the Enabled Method button
  7. In the Configure JWT page under the Jwks url enter https://login.app.env0.com/.well-known/jwks.json
  8. Expand JWT Options and set the Bound issuer to be https://login.app.env0.com/
  9. Click on the Save button
Vault JWT configuration interface showing OIDC authentication setup

Configure JWT

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Setup Secrets Store and Create Policy

Create a KV store in vault to save and fetch secrets. 
vault secrets enable -path=secrets-for-env0/ kv
A policy needs to be created to define which secrets can be accessed. Here’s an example: 
vault policy write env0-access - <<EOF
path "secrets-for-env0/*" {
    capabilities = ["read", "create", "update"]
}
EOF

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Create Login Role

To create the role that binds the policy, sub, aud and env0 custom claims we will use the vault CLI. Make sure you have it installed on your machine and that you have access to vault. Export the following environment variables: 
export ENV0_ORG_ID="your_env_zero_org_id"
export VAULT_ROLE_NAME="your_vault_role_name"
export VAULT_ADDR="your_vault_address_url"
export VAULT_NAMESPACE="your_vault_namespace" (optional)
export VAULT_TOKEN="your_vault_token"
Vault CLI uses the VAULT_TOKEN environment variable to authenticate but if you prefer, you can skip it and use vault login instead. Now execute the following command to create the role: 
vault write auth/jwt/role/$VAULT_ROLE_NAME - <<EOF
{
  "user_claim": "sub",
  "role_type": "jwt",
  "policies": ["env0-access"],
  "bound_audiences": ["https://prod.env0.com"],
  "bound_claims": {
    "organizationId": "$ENV0_ORG_ID",
    "apiKeyType": "oidc"
  }
}
EOF
More ClaimsIn this example we only set the aud, the organizationId and the apiKeyType claims, however you can also set any additional claims you would like from the list of claims we support. The list is located here

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Authenticating to Vault with env zero Credential

Go to the organization’s credentials page and create a new deployment credential. Select Vault OIDC type and enter the following fields:
  • Address - The vault address, including port
  • Version- The vault version to use
  • Role Name - Vault role name
  • JWT Auth Backend Path - Path to the new authentication method
  • Namespace- Optional, the vault namespace
Interface screenshot showing configuration options
After creating the credential you will need to go to the relevant project and assign that credential to the project in the project’s credentials page. Now all environments within the project will have the relevant environment variables available.

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Authenticating to Vault with Terraform Provider

To configure the vault terraform provider all you need is the vault provider block and the VAULT OIDC deployment credentials set on the project. Example: 
provider "vault" {
  address          = var.vault_address
  skip_child_token = true # (depends on your role vault policy)
}
The VAULT OIDC deployment credentials are used to authenticate with the vault server along with the ENV0_OIDC_TOKEN JWT token which then sets the VAULT_TOKEN variable with the actual session token that is returned from the vault server used for authentication/authorization.