caerp-oidc-client 2025.1.1

OpenID Connect client for CAERP

Pyramid Oidc client library for caerp

python setup.py install

Add a client in your OpenId Authentication (e.g: Keycloak)

To configure your open id connect client in a SSO server like Keycloak.

Host : https://caerp.mycae.coop

Important Create a custom realm (don't use the master realm, you'll face serious security problems : all users would have admin rights on Keycloak)

Add a client

• ClientID : caerp_client_id
• Name : Free choice
• Root URL : https://caerp.mycae.coop
• Home URL : https://caerp.mycae.coop
• Valid Redirect URIs : https://caerp.mycae.coop/*
• Valid post logout redirect URIs : https://caerp.mycae.coop/login
• Web Origins : https://caerp.mycae.coop
• Admin URL : Nothing
• Client Authentication : True
• Authentication Flow : Check the following
  • Standard Flow
  • Direct access grants
• Disable Consent required
• Backchannel logout url : https://caerp.mycae.coop/oidc_backend_logout
• Backchannel logout session required: True

For security reasons, always use HTTPS protocol in URLs. Certificates must be provided by well known authorities.

The REQUESTS_CA_BUNDLE environment variable may be used to specify your custom trusted certificates.

Retrieve the client secret

In the "Credentials" section of the keycloak client view, retrieve the client's secret (you need it to configure caerp)

Configure your client : caerp

In your caerp application's ini file

pyramid.includes = ...
                   caerp_oidc_client.models

Later in the same ini file

caerp.authentification_module=caerp_oidc_client

oidc.client_secret=<Secret token from the OIDC server>
oidc.client_id=caerp_client_id
oidc.scope=openid roles
oidc.auth_endpoint_url=<Keycloak auth endpoint url>
oidc.token_endpoint_url=<Keycloak id token endpoint url>
oidc.logout_endpoint_url=<Keycloak logout endpoint url>

JWKS Token validation

Due to backward compatibility, by default, caerp_oidc_client doesn't validate the JWT token using the JWKS encryption data.

JWKS validation is highly recommended and is mandatory for obvious security reasons when the JWT token is transmitted by a third_party (for example frontend or api gateway).

To configure JWKS Token validation, add the following lines :

oidc.jwks_service=caerp_oidc_client.services.JWKSService
oidc.jwks_endpoint_url=<Keycloak jwks endpoint url>
oidc.token_signature_algorithms=<use one of HS256 HS384 HS512 RS256 RS384 RS512>

Keycloak's url are in the form

https://keycloak/realms/**my custom realm name**/protocol/openid-connect/auth

https://keycloak/realms/**my custom realm name**/protocol/openid-connect/token

https://keycloak/realms/**my custom realm name**/protocol/openid-connect/logout

https://keycloak/realms/**my custom realm name**/protocol/openid-connect/certs

Some advices for security

• Use HTTPS protocol for endpoints
• Apply security recommandations regardless TLS protocol (e.g Anssi TLS recommandations)
• Aply security recommandations for web sites (e.g Recommandations relatives pour la sécurisation des sites web