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Single Sign-On

The consumerfinance.gov codebase support single sign-on (SSO) with Open ID Connect (OIDC) providers. We use Mozilla's mozilla-django-oidc library for OIDC support.

Local implementation

Our implementation of OIDC SSO uses a custom subclass of mozilla-django-oidc's OIDCAuthenticationBackend, found in login.auth.CFPBOIDCAuthenticationBackend, that supports additional OIDC claims processing. This enables us to map OIDC roles to Django groups and/or superuser permissioning, and lets us synchronize a user's name to the profile information in the OIDC provider.

If the OIDC_OP_ADMIN_ROLE setting is defined, Django's is_superuser will be set for users who the OIDC provider reports as having this role identifier.

Every user who is authorized in the SSO provider will be assigned to a "Wagtail Users" group. This enables all members to log into the Wagtail admin.

This group is created with the wagtailadmin.access_admin permission once via data migration in the login app. If for any reason this group is removed, it will need to be recreated, otherwise new SSO users will not be able to login without an admin user assigning them the wagtailadmin.access_admin permission manually.

Testing OIDC single sign-on locally

For development of mozilla-django-oidc, Mozilla uses a test OIDC provider, which is published to Docker Hub as mozilla/oidc-testprovider:oidc_testprovider-latest. This test provider is a Django project that uses django-oidc-provider as the OIDC provider application.

We make use of this test provider to enable local testing and development related to SSO for consumerfinance.gov. The OIDC test provider is available in the docker-compose.sso.yml file.

For consumerfinance.gov, our compose file adds another set of fixture data that adds localhost:8000 as a client in addition to the test provider's built-in testrp client that Mozilla uses for local development.

Run the test OIDC provider

fasdfoasdfo The test OIDC provider can be run with:

docker-compose -f docker-compose.sso.yml up

This will start the test provider at http://localhost:8080.

Create a user in the test OIDC provider

To sign-in via the test provider requires a user. mozilla-django-oidc defaults to using email address to map users between the OIDC provider and the client, and we do not override this default.

Navigate to http://localhost:8080 and you will see an option to sign up, as well as log in. Sign up using an email address you know is already set up as a user in your local consumerfinance.gov database.

Configure the consumerfinance.gov environment

Our .env_SAMPLE file includes SSO-related environment variables with defaults intended for local development against the test OIDC provider.

Either uncomment or add the following lines to your .env file:

export ENABLE_SSO=True
export OIDC_RP_CLIENT_ID=4
export OIDC_RP_CLIENT_SECRET=itsasecret
export OIDC_RP_SIGN_ALGO=HS256
export OIDC_OP_AUTHORIZATION_ENDPOINT=http://localhost:8080/openid/authorize
export OIDC_OP_TOKEN_ENDPOINT=http://localhost:8080/openid/token
export OIDC_OP_USER_ENDPOINT=http://localhost:8080/openid/userinfo

And then make sure to source it:

source .env

Run consumerfinance.gov and log in

Start or restart your local consumerfinance.gov instance, then visit http://localhost:8000/admin. Click "Sign in with Single Sign-On".

This should redirect you to the test OIDC provider at http://localhost:8080/openid/authorize with a prompt to authorize "Wagtail (Local HS256)" (the name of the client application as configured in the test provider) to access the OIDC user's address.

Click "Authorize", and you should be returned to http://localhost:8000/admin, logged in as the expected user.

References

For more information on our OIDC single sign-on implementation, please refer to:

Additionally, the source code to the following may also be useful: