»OIDC Provider Configuration

This page collects high-level setup steps on how to configure an OIDC application for various providers. For more general usage and operation information, see the Vault JWT/OIDC method documentation.

OIDC providers are often highly configurable and you should become familiar with their recommended settings and best practices. The instructions below are largely community-driven and intended to help you get started. Corrections and additions may be submitted via the Vault Github repository.

»Azure Active Directory (AAD)

Reference: Azure Active Directory v2.0 and the OpenID Connect protocol

Choose your Azure tenant.
Go to Azure Active Directory and register an application for Vault.
Add Redirect URIs with the "Web" type. You may include two redirect URIs, one for CLI access another one for Vault UI access.
- http://localhost:8250/oidc/callback
- https://hostname:port_number/ui/vault/auth/oidc/oidc/callback
Record the "Application (client) ID" as you will need it as the oidc_client_id.
Under API Permissions grant the following permission:
- Microsoft Graph API permission GroupMember.Read.All
Under Endpoints, copy the OpenID Connect metadata document URL, omitting the /well-known... portion.
- The endpoint URL (oidc_discovery_url) will look like: https://login.microsoftonline.com/tenant-guid-dead-beef-aaaa-aaaa/v2.0
Under Certificates & secrets, add a client secret Record the secret's value as you will need it as the oidc_client_secret for Vault.

»Connect AD group with Vault external group

Reference: Azure Active Directory with OIDC Auth Method and External Groups

To connect the AD group with a Vault external groups, you will need Azure AD v2.0 endpoints. You should set up a Vault policy for the Azure AD group to use.

Go to Azure Active Directory and choose your Vault application.
Go to Token configuration and Add groups claim. Select "All" or "SecurityGroup" based on which groups for a user you want returned in the claim.
In Vault, enable the OIDC auth method.

Configure the OIDC auth method with the oidc_client_id (application ID), oidc_client_secret (client secret), and oidc_discovery_url (endpoint URL) you recorded from Azure.

vault write auth/oidc/config \
   oidc_client_id="your_client_id" \
   oidc_client_secret="your_client_secret" \
   default_role="your_default_role" \
   oidc_discovery_url="https://login.microsoftonline.com/tenant_id/v2.0"

Configure the OIDC Role with the following:

user_claim should be "email".
allowed_redirect_uris should be the two redirect URIs for Vault CLI and UI access.
groups_claim should be set to "groups".
oidc_scopes should be set to "https://graph.microsoft.com/.default".

vault write auth/oidc/role/your_default_role \
   user_claim="email" \
   allowed_redirect_uris="http://localhost:8250/oidc/callback,https://online_version_hostname:port_number/ui/vault/auth/oidc/oidc/callback"  \
   groups_claim="groups" \
   oidc_scopes="https://graph.microsoft.com/.default" \
   policies=default

In Vault, create the external group. Record the group ID as you will need it for the group alias.
From Vault, retrieve the OIDC accessor ID from the OIDC auth method as you will need it for the group alias's mount_accessor.
Go to the Azure AD Group you want to attach to Vault's external group. Record the objectId as you will need it as the group alias name in Vault.

In Vault, create a group alias for the external group and set the objectId as the group alias name.

vault write identity/group-alias \
   name="your_ad_group_object_id" \
   mount_accessor="vault_oidc_accessor_id" \
   canonical_id="vault_external_group_id"

»Optional Azure-specific Configuration

If a user is a member of more than 200 groups (directly or indirectly), extra configuration is required so that Vault can fetch the groups properly.

In Azure, under the applications API Permissions, grant the following permissions:
- Microsoft Graph API permission Directory.Read.All

In Vault, set "provider_config" to Azure.

vault write auth/oidc/config -<<"EOH"
{
   "oidc_client_id": "your_client_id",
   "oidc_client_secret": "your_client_secret",
   "default_role": "your_default_role",
   "oidc_discovery_url": "https://login.microsoftonline.com/tenant_id/v2.0",
   "provider_config": {
      "provider": "azure"
   }
}
EOH

In Vault, add "profile" to oidc_scopes so the user's id comes back on the JWT.

vault write auth/oidc/role/your_default_role \
 user_claim="email" \
 allowed_redirect_uris="http://localhost:8250/oidc/callback,https://online_version_hostname:port_number/ui/vault/auth/oidc/oidc/callback"  \
 groups_claim="groups" \
 oidc_scopes="profile" \
 policies="default"

»Auth0

Select Create Application (Regular Web App).
Configure Allowed Callback URLs.
Copy client ID and secret.
If you see Vault errors involving signature, check the application's Advanced > OAuth settings and verify that signing algorithm is "RS256".

»Gitlab

Visit Settings > Applications.
Fill out Name and Redirect URIs.
Making sure to select the "openid" scope.
Copy client ID and secret.

»Google

Main reference: Using OAuth 2.0 to Access Google APIs

Visit the Google API Console.
Create or a select a project.
Create a new credential via Credentials > Create Credentials > OAuth Client ID.
Configure the OAuth Consent Screen. Application Name is required. Save.
Select application type: "Web Application".
Configure Authorized Redirect URIs.
Save client ID and secret.

»Optional Google-specific Configuration

Google-specific configuration is available when using Google as an identity provider from the Vault JWT/OIDC auth method. The configuration allows Vault to obtain G Suite group membership and user information during the JWT/OIDC authentication flow. The group membership obtained from G Suite may be used for Identity group alias association. The user information obtained from G Suite can be used to copy claims data into resulting auth token and alias metadata via claim_mappings.

»Setup

To set up the Google-specific handling, you'll need:

A G Suite account with the super admin role for granting domain-wide delegation API client access.
The ability to create a service account in Google Cloud Platform.

The Google-specific handling that's used to fetch G Suite groups and user information in Vault uses G Suite Domain-Wide Delegation of Authority for authentication and authorization. You need to follow all steps in the guide to obtain the key file for a Google service account capable of making requests to the G Suite User Accounts and Groups APIs.

In step 5 within the section titled Delegate domain-wide authority to your service account, the only OAuth scopes that should be granted are:

https://www.googleapis.com/auth/admin.directory.group.readonly
https://www.googleapis.com/auth/admin.directory.user.readonly

This is an important security step in order to give the service account the least set of privileges that enable the feature.

The Google service account key file obtained from the steps in the guide must be made available on the host that Vault is running on.

»Configuration

provider (string: <required>) - Name of the provider. Must be set to "gsuite".
gsuite_service_account (string: <required>) - Either the path to or the contents of a Google service account key file in JSON format. If given as a file path, it must refer to a file that's readable on the host that Vault is running on. If given directly as JSON contents, the JSON must be properly escaped.
gsuite_admin_impersonate (string: <required>) - Email address of a G Suite admin to impersonate.
fetch_groups (bool: false) - If set to true, groups will be fetched from G Suite.
fetch_user_info (bool: false) - If set to true, user info will be fetched from G Suite using the configured user_custom_schemas.
groups_recurse_max_depth (int: <optional>) - Group membership recursion max depth. Defaults to 0, which means don't recurse.
user_custom_schemas (string: <optional>) - Comma-separated list of G Suite custom schemas. Values set for G Suite users using custom schema fields will be fetched and made available as claims that can be used with claim_mappings. Required if fetch_user_info is set to true.

Example configuration:

vault write auth/oidc/config -<<EOF
{
    "oidc_discovery_url": "https://accounts.google.com",
    "oidc_client_id": "your_client_id",
    "oidc_client_secret": "your_client_secret",
    "default_role": "your_default_role",
    "provider_config": {
        "provider": "gsuite",
        "gsuite_service_account": "/path/to/service-account.json",
        "gsuite_admin_impersonate": "admin@gsuitedomain.com",
        "fetch_groups": true,
        "fetch_user_info": true,
        "groups_recurse_max_depth": 5,
        "user_custom_schemas": "Education,Preferences"
    }
}
EOF

Example role:

vault write auth/oidc/role/your_default_role \
    allowed_redirect_uris="http://localhost:8200/ui/vault/auth/oidc/oidc/callback,http://localhost:8250/oidc/callback" \
    user_claim="sub" \
    groups_claim="groups" \
    claim_mappings="/Education/graduation_date"="graduation_date" \
    claim_mappings="/Preferences/shirt_size"="shirt_size"

»Keycloak

Select/create a Realm and Client. Select a Client and visit Settings.
Client Protocol: openid-connect
Access Type: confidential
Standard Flow Enabled: On
Configure Valid Redirect URIs.
Save.
Visit Credentials. Select Client ID and Secret and note the generated secret.

»Okta

Make sure an Authorization Server has been created. The "Issuer" field shown on the Setting page will be used as the oidc_discovery_url.
Visit Applications > Add Application (Web).
Configure Login redirect URIs. Save.
Save client ID and secret.

Note your policy will need oidc_scopes to include profile to get a full profile ("Fat Token"). You will also need to configure bound audience along the lines of "bound_audiences": ["api://default", "0a4........."] if you are using the default authorization server.