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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">That’s what I thought. Thanks for confirming.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> -- Mike<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> John Bradley [mailto:ve7jtb@ve7jtb.com]
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<b>Sent:</b> Wednesday, January 23, 2013 7:02 AM<br>
<b>To:</b> Mike Jones<br>
<b>Cc:</b> openid-specs-ab@lists.openid.net<br>
<b>Subject:</b> Re: [Openid-specs-ab] token_endpoint_auth_method Registration example error?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The server may support multiple methods, but the client MUST only register one, so it shouldn't be multi value for simplicity.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If you need two auth methods they should be different client_id.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This is intended mostly to enhance security and prevent a server from taking client_secret_basic from an attacker when the real client is using private_key_jwt.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">John B.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 2013-01-23, at 9:07 AM, Mike Jones <<a href="mailto:Michael.Jones@microsoft.com">Michael.Jones@microsoft.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Registration contains the following definition:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN" style="font-size:11.0pt;font-family:"Verdana","sans-serif"">token_endpoint_auth_method</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN" style="font-size:11.0pt;font-family:"Verdana","sans-serif"">OPTIONAL. Requested authentication method for the Token Endpoint. The options are</span><tt><span lang="EN" style="color:#003366">client_secret_post</span></tt><span lang="EN" style="font-size:11.0pt;font-family:"Verdana","sans-serif"">,<span class="apple-converted-space"> </span></span><tt><span lang="EN" style="color:#003366">client_secret_basic</span></tt><span lang="EN" style="font-size:11.0pt;font-family:"Verdana","sans-serif"">,<span class="apple-converted-space"> </span></span><tt><span lang="EN" style="color:#003366">client_secret_jwt</span></tt><span lang="EN" style="font-size:11.0pt;font-family:"Verdana","sans-serif"">,
and<span class="apple-converted-space"> </span></span><tt><span lang="EN" style="color:#003366">private_key_jwt</span></tt><span lang="EN" style="font-size:11.0pt;font-family:"Verdana","sans-serif"">, as described in Section 2.2.1 of [OpenID.Messages]. Other
Authentication methods may be defined by extension. If unspecified or omitted, the default is<span class="apple-converted-space"> </span></span><tt><span lang="EN" style="color:#003366">client_secret_basic</span></tt><span class="apple-converted-space"><span lang="EN" style="font-size:11.0pt;font-family:"Verdana","sans-serif""> </span></span><span lang="EN" style="font-size:11.0pt;font-family:"Verdana","sans-serif"">HTTP
Basic Authentication Scheme as specified in Section 2.3.1 of [RFC6749].</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">It later uses “token_endpoint_auth_method” in two example result values in this manner:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="font-family:"Courier New"">"token_endpoint_auth_method":</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="font-family:"Courier New""> "client_secret_basic client_secret_post",</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">This looks like a bug to me, since the string appears to be trying to contain multiple values.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Thus, I’m changing the string used to just<span class="apple-converted-space"> </span></span><span lang="EN" style="font-family:"Courier New"">"client_secret_basic"</span><span class="apple-converted-space"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">to
make the example correct. But I thought I’d point this out in case the example may have been intentional in some manner.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> -- Mike<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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