Senior LevelAuthentication & Authorization
What is the Continuous Access Evaluation Protocol (CAEP / Shared Signals Framework)?
❓ Interview Prompt: Explain OpenID CAEP (Continuous Access Evaluation Protocol), Shared Signals Framework (SSF / RFC 8935), Security Event Tokens (SET), and instant push revocation.
Traditionally, when a user's account is disabled or password is reset at the Identity Provider (Okta/Entra ID), active session tokens on SaaS applications remain valid until natural expiration (often hours later!). CAEP (Continuous Access Evaluation Protocol) solves this.
How CAEP / SSF Works:
1
Shared Signals Framework (SSF): Standardizes Event Streams where IdPs push real-time Security Event Tokens (SET) (RFC 8935) to subscribed SaaS apps.
2
Event Types: 'session-revoked', 'credential-compromised', 'device-compliance-change', 'user-disabled'.
3
Instant Action: SaaS backends receive the push event and revoke user sessions within seconds globally!
Code Implementation Example
json
{
"iss": "https://idp.enterprise.com",
"iat": 1770042819,
"jti": "set_a1b2c3d4",
"aud": "https://saas.app.com",
"events": {
"https://schemas.openid.net/secevent/caep/event-type/session-revoked": {
"subject": { "format": "iss_sub", "iss": "https://idp.enterprise.com", "sub": "usr_1042" },
"event_timestamp": 1770042810,
"reason_admin": { "en": "User password reset triggered by Security SOC" }
}
}
}💡CAEP Security Event Token (SET) JSON payload notifying SaaS apps of instant session revocation.
🎯 Interview Key Takeaway
CAEP (Shared Signals Framework) allows Identity Providers to push real-time Security Event Tokens to revoke access on SaaS apps instantly.
#CAEP#SSF#Security Events#Real-Time Revocation#Senior
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