# ENS de Lyon CAS single sign-on (Apereo CAS 3.0 protocol)

**Canonical:** https://apis.io/apis/ens-lyon/cas-sso/  
**Provider:** École Normale Supérieure de Lyon — https://apis.io/providers/ens-lyon/  
**Base URL:** https://cas.ens-lyon.fr/cas/  
**Documentation:** https://cas.ens-lyon.fr/cas/login

ENS de Lyon CAS single sign-on (Apereo CAS 3.0 protocol) is one of 8 APIs that [École Normale Supérieure de Lyon](https://apis.io/providers/ens-lyon/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Identity, Single Sign-On, CAS, and Authentication. The published artifact set on APIs.io includes authentication docs.

Apereo CAS service running on ENS de Lyon's own host cas.ens-lyon.fr (140.77.51.3). The CAS 3.0 validation endpoint /cas/p3/serviceValidate answers unauthenticated with a well-formed cas:serviceResponse document, so the protocol surface is real and probeable even though every ticket-granting operation requires an ENS de Lyon account. There is no third-party client registration and no published integration guide.

## Machine-readable artifacts (1)

- **Authentication** — https://raw.githubusercontent.com/api-evangelist/ens-lyon/refs/heads/main/authentication/ens-lyon-authentication.yml

## Other École Normale Supérieure de Lyon APIs (7)

- [ENS de Lyon Shibboleth Identity Provider (SAML 2.0 metadata)](https://apis.io/apis/ens-lyon/shibboleth-idp/)
- [RENATER Fédération Éducation-Recherche entity (ENS de Lyon IdP)](https://apis.io/apis/ens-lyon/renater-fer-entity/)
- [ENS de Lyon Microsoft Entra ID tenant (OIDC + SAML metadata)](https://apis.io/apis/ens-lyon/entra-id-tenant/)
- [HAL OAI-PMH — ens-lyon collection](https://apis.io/apis/ens-lyon/hal-oai-pmh/)
- [HAL Search API — ens-lyon collection](https://apis.io/apis/ens-lyon/hal-search/)
- [ROR registry record (04zmssz18)](https://apis.io/apis/ens-lyon/ror-record/)
- [Crossref Funder Registry entry (501100018692)](https://apis.io/apis/ens-lyon/crossref-funder/)

## Tags

Identity, Single Sign-On, CAS, Authentication

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/ens-lyon/cas-sso/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/ens-lyon/.