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saml-dev - RE: [saml-dev] Logout from a single SP.
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- From: "Conor P. Cahill" <concahill@aol.com>
- To: "Giuseppe Sarno" <gsarno@nortel.com>
- Date: Mon, 7 Nov 2005 20:29:21 -0500
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Giuseppe Sarno wrote on 11/7/2005, 8:55 AM:
Hi
just to reply to your last point:
As I said above, I think that the
SP should be required to send the Session Index if it was in the
assertion used to establish SessionB (athouhg I can't find anything
that says that explicitly). However, even lacking that, I don't think
that an SP should be authorized to end sessions that were not
associated with the SP (although the IdP may allow "trusted" SPs to do
so when the reason is an "...:admin" because of the thought that if it
wasn't user initiated there may be something strange going on and the
IdP may want to play it safe -- obviously this is not a part of the
SAML spec, but I think that a cautious IdP may do this, especially with
partners that they "trust").
Isn't
this though the principal behind the single Logout ? (SP initiated)
Are
you advocating that only the IDP can actually initiate the Single
Logout sequence ? and the SP can only initiate Logout for own sessions
?
The SP can
initiate single logout, but it should only be able to do so for
authentication sessions that were associated with the SP not with
sessions that had nothing to do with that SP.
If the user wants to truely cancell all active sessions everywhere,
they should coordinate it through their IdP.
In general I think that the user will not want to do cross-session
logout and that the IdP would only do this in extenuating circumstances
that are security driven (perhaps when a user changes their password
all existing sessions are cancelled and must be re-authenticated to
continue). For the most part SLO is a session based operation.
Conor
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