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Subject: [OASIS Issue Tracker] Commented: (SECURITY-6) PE: Conflict withcore in SSO profile on returning error Responses to SP

    [ http://tools.oasis-open.org/issues/browse/SECURITY-6?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18332#action_18332 ] 

Ari Kermaier commented on SECURITY-6:

I would note that the operational context of this processing rule is "the success or failure of the <AuthnRequest>" -- i.e., the success or failure of the requested authentication. If, however, there is a failure in processing the AuthnRequest message itself (e.g., signature verification failure, inability to verify ownership of the AssertionConsumerService URL, etc.), the IdP need not (perhaps even should not) return a <Response> message. The use of language like "under any circumstances within its control" may inadvertently serve to obscure that distinction.

> PE: Conflict with core in SSO profile on returning error Responses to SP
> ------------------------------------------------------------------------
>                 Key: SECURITY-6
>                 URL: http://tools.oasis-open.org/issues/browse/SECURITY-6
>             Project: OASIS Security Services (SAML) TC
>          Issue Type: Bug
>          Components: Profiles
>    Affects Versions: Version 2.0
>            Reporter: Scott Cantor
>            Assignee: Scott Cantor
>            Priority: Minor
>             Fix For: 2.0 incorporating Approved Errata
> Section of Core states that "The responder MUST ultimately reply to an <AuthnRequest> with a <Response> message..." regardless of success or failure.
> Section of Profiles reads "Regardless of the success or failure of the <AuthnRequest>, the identity provider SHOULD produce an HTTP response to the user agent containing a <Response> message...".
> The conflicting language should be clarified, without imposing the impossible requirement for an IdP to guarantee a response, but to encourage implementers to favor responses and/or provide options to ensure that.

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