<div dir="ltr"><div><br></div><div>The new core recommends the following. This seems to be a new text introduced in the new core. </div><h3><span lang="EN">2.3.3.8. Access Token</span></h3>
<span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black">If an Access Token is
returned from both the Authorization Endpoint and from the Token Endpoint,
which is the case with the </span><tt><span lang="EN" style="font-size:12pt">response_type</span></tt><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black"> values </span><tt><span lang="EN" style="font-size:12pt">code token</span></tt><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black"> and </span><tt><span lang="EN" style="font-size:12pt">code id_token token</span></tt><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black">, it is RECOMMENDED that their values be the same.</span><br clear="all">
<div><br></div><div>Is this true? I feel like the opposite is true. The reason for getting Access Token from both the AuthZ Endpoint and the Token Endpoint is that they have different security characteristics: The later is more secure and thus trusted. So, there is a value in differentiating between them. e.g. the former has lesser expiry time as well as lesser permission. </div>
<div><br></div><div>I feel like it should be as follows: </div><div><br></div><div><h3><span lang="EN">2.3.3.8. Access Token</span></h3><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black">If an Access Token is returned from both the Authorization Endpoint and from the Token Endpoint, which is the case with the </span><tt><span lang="EN" style="font-size:12pt">response_type</span></tt><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black"> values </span><tt><span lang="EN" style="font-size:12pt">code token</span></tt><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black"> and </span><tt><span lang="EN" style="font-size:12pt">code id_token token</span></tt><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black">, it is RECOMMENDED that their values be different. The access token returned from Authorization Endpoint is more vulnerable to various attack so that it has less trust than that returned from the Token Endpoint. Thus, the Server MAY give lesser permission and shorter life time for the Access Token that is returned from the Authorization Endpoint. </span><br>
</div><div><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black"><br></span></div><div><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black">Section 2.3 has bunch of bugs which was quite clear in how to fix, but this one was not that obvious so I am asking. </span></div>
<div><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black"><br></span></div><div><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black">Best, </span></div><div><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black"><br>
</span></div><div><span lang="EN" style="font-size:12pt;font-family:Verdana,sans-serif;color:black"><br></span></div>-- <br>Nat Sakimura (=nat)<div>Chairman, OpenID Foundation<br><a href="http://nat.sakimura.org/" target="_blank">http://nat.sakimura.org/</a><br>
@_nat_en</div>
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