ProtocolSoup

Single Logout (SLO)

SAML 2.0 Single Logout Profile terminates sessions across all federated participants - the IdP and every SP with an active session for the user (saml-profiles §4.4). When a user logs out at one participant, LogoutRequest messages are propagated to all other participants to ensure global session termination. SLO uses either front-channel (HTTP-Redirect/POST via browser) or back-channel (SOAP direct communication) bindings.

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XML-BasedFederated Logout

Sequence Diagram

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UserInitiatorSPIdPOther SPsSPsInitiating SP1User Initiates Logout2Create LogoutRequest3LogoutRequest Sent to IdP4IdP Propagates Logout to All SPs5SPs Terminate Sessions and Respond6IdP Terminates Own Session7Final LogoutResponse to Initiating SP8Logout Complete
Request
Response
Redirect
Internal

Step-by-Step Breakdown

1
User Initiates Logout
User → Initiating Party
2
Create LogoutRequest
Initiating Party → Initiating Party
3
LogoutRequest Sent to IdP
Service Provider → Identity Provider
4
IdP Propagates Logout to All SPs
Identity Provider → Other Service Providers
5
SPs Terminate Sessions and Respond
Service Providers → Identity Provider
6
IdP Terminates Own Session
Identity Provider → Identity Provider
7
Final LogoutResponse to Initiating SP
Identity Provider → Initiating Service Provider
8
Logout Complete
Service Provider → User

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Specs for this flow

Sections of the protocol that normatively define this flow, plus the security considerations that apply to it.

Core specs

· The specifications that define this protocol.

Security & privacy

· Dedicated security and privacy considerations.
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