Configuring SAML for enterprise federation in GCP

Question

Pulumi · Accepted Answer

Configuring SAML (Security Assertion Markup Language) for enterprise federation in Google Cloud Platform (GCP) typically involves setting up a SAML Identity Provider (IdP) and configuring a Google Cloud service as the Service Provider (SP). This allows you to use your enterprise identity provider to authenticate users for application access in GCP.

In the following Pulumi program in TypeScript, we will use the `gcp.identityplatform.InboundSamlConfig` resource from the Google Cloud (GCP) provider. This resource enables SSO (Single Sign-On) with SAML for a given Google Cloud project.

Here's a step-by-step guide to how the program configures SAML for enterprise federation in GCP:

1. Create an instance of `gcp.identityplatform.InboundSamlConfig`. This represents a SAML configuration that can be used for federated authentication into a Google Cloud project.

2. Apply the necessary configuration properties such as `name`, `project`, `spConfig`, and `idpConfig`:
   - `name`: A unique identifier of the SAML configuration.
   - `project`: The GCP project where you want to configure the SAML federation.
   - `spConfig`: The service provider configuration, including entity id and callback URL.
   - `idpConfig`: The identity provider configuration, such as the SSO URL and IdP entity id.

3. Define the necessary certificates for `spCertificates` and `idpCertificates` for secure communication between the SP and IdP.

Before proceeding with the program, make sure you have set up your GCP provider credentials in Pulumi to allow the deployment of resources in your GCP project.

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

// SAML configuration for GCP enterprise federation setup
const samlConfig = new gcp.identityplatform.InboundSamlConfig("samlConfig", {
    // Replace with the name you would like to give to this SAML configuration
    name: "your-saml-config-name",
    // Set the project ID where you want to configure the SAML federation
    project: "your-project-id",
    // Service Provider Configuration
    spConfig: {
        // Set your service provider entity id, typically a URI provided by GCP
        spEntityId: "https://your-sp-entity-id",
        // Set a callback URI provided by your Google Cloud project
        callbackUri: "https://your-project-callback-url",
        // Add the SP certificates (if needed for your SAML auth flow)
        spCertificates: [{
            x509Certificate: "SP_CERTIFICATE_CONTENT"
        }],
    },
    // Identity Provider Configuration
    idpConfig: {
        // Set your IdP's Single Sign-On URL
        ssoUrl: "https://your-idp-sso-url",
        // Set your identity provider's entity id
        idpEntityId: "your-idp-entity-id",
        // Set to true if your IdP is configured to sign authn request
        signRequest: true,
        // Add the IdP certificates for validating signatures from the IdP
        idpCertificates: [{
            x509Certificate: "IDP_CERTIFICATE_CONTENT"
        }],
    },
    // Enable this SAML config
    enabled: true,
    displayName: "Your SAML Configuration Display Name",
});

// Export the SAML configuration's name
export const samlConfigurationName = samlConfig.name;
```

In this program, you'll need to replace placeholder text such as `your-saml-config-name`, `your-project-id`, `https://your-sp-entity-id`, `https://your-project-callback-url`, `https://your-idp-sso-url`, `your-idp-entity-id`, `SP_CERTIFICATE_CONTENT`, and `IDP_CERTIFICATE_CONTENT` with actual values from your SP and IdP.

The `spCertificates` and `idpCertificates` may contain actual x509 certificate content, which should be kept secure. These are necessary for establishing a trust relationship between the service provider (your GCP application) and the identity provider (your SAML IdP).

After deploying this configuration, users accessing your Google Cloud application will be redirected to the configured IdP for authentication. Post successful authentication, the IdP will redirect the users back to the Google Cloud application along with a SAML response that is used to complete the login process.

Remember, this is sensitive infrastructure configuration. Keep your IdP and SP certificate details secure and handle them according to your organization's security policies.

For a more detailed understanding and specific use-cases, you can refer to Google Cloud's documentation. Here's the link to the [GCP Inbound SAML Configuration documentation](https://www.pulumi.com/registry/packages/gcp/api-docs/identityplatform/inboundsamlconfig/), which provides more information on the properties and usage of the `InboundSamlConfig` resource.