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<p class=MsoNormal><span style='color:#1F497D'>We went through this issue, last
week. This is what I took away:-<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>There is a step 5. The RP must identity
the OP(s) associated with the Claimed_Identity, as published by the user in her/her
HTML/XRDS file. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>There is a step 6. The OP must
first check the realm controls, published by the RP in its XRDS file, before
considering giving a positive </span>check_authentication answer<span
style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>There is a step 7. The RP must check
that the OP who issue a check_authentication response is “valid” –
by linking the OP’s SSL cert to the URL selected in 5. Validity
should mean doing full PKI checking of the server’s cert chain, and
sending any client cert chain (and TLS extensions) as required by the SSL
cipher-suite. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I also took away an implied
control: if a </span>id_res response message has an claim for the URL of the
OP, it MUST NOT be used to substitute step 5.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Now reconsider your very important issue, given those extra
steps.<o:p></o:p></p>
<p class=MsoNormal>.<span style='color:#1F497D'><o:p></o:p></span></p>
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<p class=MsoNormal>My question is: how does the RP know that the OP has
“authentication authority” over the asserted User URL. In the
original protocol, the OP was pointed by an element contained in the HTML
document referenced by the identity URL, that is, the owner of the URL
delegated the authentication to the OP by defining the address of the OP. However,
in the “OpenID Information Cards” this protocol step is absent.<o:p></o:p></p>
<p class=MsoNormal>What forbids me of creating an OP that asserts any identity
URL that I want?<o:p></o:p></p>
<p class=MsoNormal>Thanks.<o:p></o:p></p>
<p class=MsoNormal>Pedro Felix<o:p></o:p></p>
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