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Single Sign-On (SSO) to G Suite#

This document will explain how to configure G Suite and the Gluu Server for single sign-on (SSO).

Note

It is highly recommended to use Google's staging apps environment before migrating to production.

Create a G Suite account#

You can do that here. Don't forget to add at least one more user account(we are going to use that user to test SSO) other than default 'admin' account you are using in Google Admin panel.

If you already have an account skip to the next section.

Note

You need a valid and unused domain name

Configuring G Suite#

  • Log in to your G Suite admin dashboard here.

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  • From the list of options choose the Security tab.

  • A new page will open. Select Set up single sign-on(SSO) from the options.

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  • Single Sign-On setting page will appear.

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This page contains a number of selection, and entry fields.

  • Set up SSO with third party Identity Provider: This refers to your Gluu Server instance. Enable this box.

  • Sign-in Page URL: Enter the uri of the sign-in page, for example https://idp_hostname/idp/profile/SAML2/Redirect/SSO.

  • Sign-out Page URL: Enter the uri of the logout page, for example https://idp_hostname/idp/Authn/oxAuth/logout.

  • Change Password URL: The uri an user is redirected if he wants to change his password. It is recommended that an organization provides such a link for its end users.

  • Verification certificate: Upload the SAML certificate of your Gluu Server. The SAML certificates are available in the /etc/certs folder inside the Gluu Server chroot environment. At the time of writting, the cert file is /etc/certs/idp-signing.crt

  • Use a domain specific issuer: Enable this box to use a domain-specific issuer.

  • Save your data using the Save changes button on the lower right of the page.

Refer to Google SSO to know more.

Configuring the Gluu Server#

Now we need to get the Google Metadata and create a SAML Trust Relationship in the Gluu Server. Trust Relationships are created so that the IDP (your Gluu Server) can authorize/authenticate the user to the service provider (SP)--in this case, G Suite.

Google Metadata#

In order to create a Trust Relationship, we need to grab the metadata of G Suite. This metadata can be collected from Google. It's generally specific to an organization account. The following is a template of the Google metadata. Replace domain.com with your own domain name (the one used when creating G Suite account).

<EntityDescriptor entityID="google.com/a/domain.com" xmlns="urn:oasis:names:tc:SAML:2.0:metadata">
    <SPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol">
       <NameIDFormat>urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress</NameIDFormat>
            <AssertionConsumerService index="1" Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
            Location="https://www.google.com/a/domain.com/acs" >
            </AssertionConsumerService>
    </SPSSODescriptor>
</EntityDescriptor>

Got the metadata? Great, we are ready to move forward.

Configure Shibboleth to support G Suite's custom nameId format#

G Suite requires an email (user@domain.com) address as NameID. This requires configuring Shibboleth to support emailAddress.

Edit the /opt/gluu/jetty/identity/conf/shibboleth3/idp/saml-nameid.xml.vm file and uncomment the following sections, which are commented out by default:

        <bean parent="shibboleth.SAML2AttributeSourcedGenerator"
            p:format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
            p:attributeSourceIds="#{ {'mail'} }" />

        <bean parent="shibboleth.SAML1AttributeSourcedGenerator"
            p:format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
            p:attributeSourceIds="#{ {'mail'} }" />

Restart the identity and idp services.

Create a SAML Trust Relationship for Google Apps:#

  • How to create a trust relationship can be found here. We need to follow the "File" method for Google Apps trust relationship. Upload the metadata which we created couple of steps back.
  • Required attributes:
    • You need to release the following attribute: Email.

Test#

  • Create an user in Gluu Server representing the G Suite account you want to log into ( 2nd user other than G Suite admin account ).
  • Make sure the user created in step one has mail attribute available whose value is equals to what is given there in G Suite account (example user@domain.com).
  • Initiate SSO with https://mail.google.com/a/domain.com (Replace domain.com with your own domain name)
  • Enjoy!