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Microsoft Entra ID OIDC Integration for Kubecost

OIDC is only officially supported on Kubecost Enterprise plans.
This guide will take you through configuring OIDC for Kubecost using a Microsoft Entra ID (formerly Azure AD) integration for SSO and RBAC.

Prerequisites

Before following this guide, ensure that:
  • Kubecost is already installed
  • Kubecost is accessible via a TLS-enabled ingress
  • You are established as a Cloud Application Administrator in Microsoft. This may otherwise prevent you from accessing certain features required in this tutorial.

Entra ID OIDC configuration

Step 1: Registering your application in Entra ID

  1. 1.
    In the Microsoft Entra admin center, select Microsoft Entra ID (Azure AD).
  2. 2.
    In the left navigation, select Applications > App registrations. Then, on the App registrations page, select New registration.
  3. 3.
    Select an appropriate name, and provide supported account types for your app.
  4. 4.
    To configure Redirect URI, select Web from the dropdown, then provide the URI as https://{your-kubecost-address}/model/oidc/authorize.
  5. 5.
    Select Register at the bottom of the page to finalize your changes.

Step 2: Configuring values.yaml

  1. 1.
    After creating your application, you should be taken directly to the app's Overview page. If not, return to the App registrations page, then select the application you just created.
  2. 2.
    On the Overview page for your application, obtain the Application (client) ID and the Directory (tenant) ID. These will be needed in a later step.
  3. 3.
    Next to 'Client credentials', select Add a certificate or secret. The 'Certificates & secrets' page opens.
  4. 4.
    Select New client secret. Provide a description and expiration time, then select Add.
  5. 5.
    Obtain the value created with your secret.
  6. 6.
    Add the three saved values, as well as any other values required relating to your Kubecost/Microsoft account details, into the following values.yaml template:
# values.yaml
oidc:
enabled: true
useIDToken: true
clientID: "{APPLICATION_CLIENT_ID}"
clientSecret: "{CLIENT_CREDENTIALS} > {SECRET_VALUE}"
secretName: "kubecost-oidc-secret"
authURL: "https://login.microsoftonline.com/{YOUR_TENANT_ID}/oauth2/v2.0/authorize?client_id={YOUR_CLIENT_ID}&response_type=code&scope=openid&nonce=123456"
loginRedirectURL: "https://{YOUR_KUBECOST_DOMAIN}/model/oidc/authorize"
discoveryURL: "https://login.microsoftonline.com/{YOUR_TENANT_ID}/v2.0/.well-known/openid-configuration"
If you are using one Entra ID app to authenticate multiple Kubecost endpoints, you must to pass an additional redirect_uri parameter in your authURL, which will include the URI you configured in Step 1.4. Otherwise, Entra ID may redirect to an incorrect endpoint. You can read more about this in Microsoft Entra ID's troubleshooting docs. View the example below to see how you should format your URI:
authURL: "https://login.microsoftonline.com/{YOUR_TENANT_ID}/oauth2/v2.0/authorize?client_id={YOUR_CLIENT_ID}&response_type=code&scope=openid&nonce=123456&redirect_uri=https%3A%2F%2F{YOUR_KUBECOST_DOMAIN}/model/oidc/authorize"

Step 3 (optional): Configuring RBAC

First, you need to configure an admin role for your app. For more information on this step, see Microsoft's documentation.
  1. 1.
    Return to the Overview page for the application you created in Step 1.
  2. 2.
    Select App roles > Create app role. Provide the following values:
  • Display name: admin
  • Allowed member types: Users/Groups
  • Value: admin
  • Description: Admins have read/write permissions via the Kubecost frontend (or provide a custom description as needed)
  • Do you want to enable this app role?: Select the checkbox
  1. 3.
    Select Apply.
Then, you need to attach the role you just created to users and groups.
  1. 1.
    In the Azure AD left navigation, select Applications > Enterprise applications. Select the application you created in Step 1.
  2. 2.
    Select Users & groups.
  3. 3.
    Select Add user/group. Select the desired group. Select the admin role you created, or another relevant role. Then, select Assign to finalize changes.
  4. 4.
    Update your existing values.yaml with this template:
oidc:
enabled: true
# THIS IS REQUIRED FOR AZURE. Azure communicates roles via the id_token instead of the access_token.
useIDToken: true
rbac:
enabled: true
groups:
- name: admin
# If admin is disabled, all authenticated users will be able to make configuration changes to the kubecost frontend
enabled: true
# SET THIS EXACT VALUE FOR ENTRA ID. This is the string Entra ID uses in its OIDC tokens.
claimName: "roles"
# These strings need to exactly match with the app roles created in Entra ID
claimValues:
- "admins"
- "superusers"
- name: readonly
# If readonly is disabled, all authenticated users will default to readonly
enabled: true
claimName: "roles"
claimValues:
- "readonly"

Troubleshooting

Option 1: Inspect all network requests made by browser

Use your browser's devtools to observe network requests made between you, your Identity Provider, and Kubecost. Pay close attention to cookies and headers.

Option 2: Review logs, and decode your JWT tokens

Run the following command:
kubectl logs deploy/kubecost-cost-analyzer
Search for oidc in your logs to follow events. Pay attention to any WRN related to OIDC. Search for Token Response, and try decoding both the access_token and id_token to ensure they are well formed. Learn more about JSON web tokens.

Option 3: Enable debug logs for more granularity on what is failing

You can find more details on these flags in Kubecost's cost-analyzer-helm-chart repo README.
kubecostModel:
extraEnv:
- name: LOG_LEVEL
value: debug