# Western Single Sign-On (Apereo CAS — CAS 3.0, SAML2, OIDC)

**Canonical:** https://apis.io/apis/western/sso-cas/  
**Provider:** Western University — https://apis.io/providers/western/  
**Base URL:** https://ssocas.uwo.ca/cas  
**Documentation:** https://wts.uwo.ca/services/o/single-sign-on-sso-saml2-oauth-oidc-cas/index.html

Western Single Sign-On (Apereo CAS — CAS 3.0, SAML2, OIDC) is one of 6 APIs that [Western University](https://apis.io/providers/western/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Identity, Authentication, SSO, SAML, and CAS. The published artifact set on APIs.io includes API documentation and authentication docs.

Western Technology Services operates an Apereo CAS server at ssocas.uwo.ca. The CAS 3.0 protocol is publicly reachable — /cas/p3/serviceValidate returns a well-formed cas:serviceResponse to an anonymous request — and the server also emits a SAML 2.0 IdP descriptor at /cas/idp/metadata (HTTP 200, IDPSSODescriptor, shibmd:Scope uwo.ca, signing certificate CN=ssocas.uwo.ca valid to 2045), and exposes a Spring Boot actuator link document at /cas/actuator. OIDC is advertised in the WTS service catalogue but its discovery document and JWKS both return 403, so no OIDC surface is publicly usable. Integration is request-based through WTS and gated behind institutional affiliation rather than open self-service registration.

## Machine-readable artifacts (3)

- **Documentation** — https://wts.uwo.ca/services/o/single-sign-on-sso-saml2-oauth-oidc-cas/index.html
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/western/refs/heads/main/authentication/western-authentication.yml
- **Conformance** — https://raw.githubusercontent.com/api-evangelist/western/refs/heads/main/conformance/western-conformance.yml

## Other Western University APIs (5)

- [Western University Shibboleth Identity Provider (SAML 2.0 metadata)](https://apis.io/apis/western/identity-federation/)
- [Scholarship@Western on Scholaris — DSpace REST API (tenant)](https://apis.io/apis/western/scholaris-rest/)
- [Scholarship@Western OAI-PMH 2.0 provider (tenant)](https://apis.io/apis/western/scholaris-oai-pmh/)
- [Western University Repository on Borealis — Dataverse API (tenant)](https://apis.io/apis/western/borealis-dataverse/)
- [Omni library discovery — Ex Libris Primo VE (tenant)](https://apis.io/apis/western/omni-primo/)

## Tags

Identity, Authentication, SSO, SAML, CAS, OpenID Connect

---

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