IBM Cloud Identity and Access Management (IAM) is a suite of products from IBM for Directory-as-a-Service. Zeplin SAML SSO is confirmed to work with IBM IAM. This article walks through configuring the IBM Cloud Identity product, which will be similar for other IBM IAM products.

Before you begin

IBM does not generate application details (needed by Zeplin) until it has Zeplin-generated values (which need IBM data to generate). You will need to contact us at support@zeplin.io to have us manually generate and supply your specific SSO URL and SP EntityID.

Configuration

In IBM Cloud Identity:

  • Select Applications from the main menu
  • Click the “Add Application” button, choose Custom Application and click the “Add Application” button
  • Name this Application, enter a Company Name, then select the Sign-on tab 
  • Enter the SP EntityID we gave you into the IBM field Provider ID
  • Enter the SSO URL we gave you into the IBM field Assertion Consumer Service URL and also into the IBM field Service Provider SSO URL
  • Under Attribute Mappings, add a new Attribute:
      -
    Attribute Name:   email
      - Attribute Name Format: leave blank
      - Attribute Source:  email
  • On the right side of the screen is the information you will need to configure Zeplin. Don’t click on Save just yet.

In Zeplin:

  • From the Organization Dashboard, click the settings button on the top right to access Settings, and select the AUTHENTICATION tab.
  • In the SAML 2.0 section, click on the “Enable” button
  • In the Zeplin popup:
      - Copy the string from the IBM field Login URL into the Zeplin field IdP SAML 2.0 Endpoint
      -
    Copy the string from the IBM field Provider ID into the Zeplin field IDP Issuer
      -
    Copy the contents of the IBM field Signing Certificate into the Zeplin field IdP Public Certificate
  • Click on the “Enable” button

Back in IBM Cloud Identity:

  • Click the “Save” button on the IBM console

Confirm everything works!

Go to the Zeplin login page, and click on the Login with SSO link (or go directly to https://app.zeplin.io/login/sso). Enter the email address of an existing Zeplin user. You should redirect to your IBM IdP to authenticate, then back to that user's Project page.

Your company's identity management policies may require you to first assign this application to your users. Usually, this is via an existing IBM IAM user group that will need to be assigned to the Application under the Entitlements tab in the IBM Cloud Identity Console. Select the appropriate group, and assign the Zeplin application and specific users if required.

Extra information for IBM IAM users

  • When it is confirmed users can log in with SAML, you can restrict login to be via via SAML only for all users by selecting this option from the AUTHENTICATION tab in Zeplin. For safety, the Owner will still be able to log in using their username/password after this option is set.
  • IBM sends a session duration value in its SAML assertion. Zeplin will expire and attempt session re-authentication at the shorter of this interval, or the value chosen in the Zeplin setting Session Timeout, on the AUTHENTICATION tab in Zeplin’s Organization settings. The default session duration value sent by IBM in the SAML assertion is 1 hour.
  • IBM IAM can sign either the Assertion or Response. Zeplin will verify either signature against the IBM IAM-generated IdP Public Certificate.
  • By default, IBM IAM does not encrypt the Assertion. Zeplin will accept unencrypted assertions, and also decrypt assertions encrypted with the Zeplin-generated x.509 certificate (available from Zeplin Support). Zeplin can decrypt all of the ciphers that IBM supports.
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