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The responsibility of the inbound authenticators authenticator component is to identify and parse all the incoming authentication requests and then build the corresponding response. A given inbound authenticator has two parts.:

• Request Processor
• Response Builder

For each protocol supported by the WSO2 Identity Server, there should be an inbound authenticator. The Identity Server includes inbound authenticators for SAML 2.0, OpenID , OpenID Connect, OAuth 2.0, Kerberos KDC, WS-Trust STS and WS-Federation (passive). The responsibility of the SAML 2.0 request processor is to accept a SAML request from a service provider, validate the SAML request and then build a common object model understood by the authentication framework and handover the request to it. The responsibility of the SAML response builder is to accept a common object model from the authentication framework and build a SAML response out of it.

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