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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">(One inline correction to conform to the SAML specs.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">Openid-specs-fastfed <openid-specs-fastfed-bounces@lists.openid.net> on behalf of Openid-specs-fastfed <openid-specs-fastfed@lists.openid.net><br>
<b>Reply-To: </b>"McAdams, Darin" <darinm@amazon.com><br>
<b>Date: </b>Monday, February 17, 2020 at 4:14 PM<br>
<b>To: </b>Openid-specs-fastfed <openid-specs-fastfed@lists.openid.net><br>
<b>Subject: </b>[Openid-specs-fastfed] Feedback on the FastFed SAML interop<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hi group,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Reviewing the feedback on <a href="https://drive.google.com/drive/folders/1ld_SRjGoTaxuIY12sWd_rh83uehCCTdu">
FastFed SAML Profile</a>, there were a couple suggestions for additional guidance. Sharing bullet points here as an FYI. Let us know if you have feedback.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Suspect this is mostly non-controversial. It describes what most of us are already doing. But, worth capturing. I’ll plan to update the spec with the information.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">--------------------------------------------</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">[Rough-draft]</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Replay Attack Mitigation</span></b><o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo3"><span style="font-size:11.0pt">Identity Providers MUST include a “Conditions” element in the Assertion with NotBefore and NotOnOrAfter elements to bound the lifetime of the assertion.
The lifetime time SHOULD be as short as possible. As a reference to implementors, a 10 minute window is often sufficient to reduce the risk of replays while still allowing a small degree of clock skew between participants.</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo3"><span style="font-size:11.0pt">Application Providers MUST validate the Condition is satisfied.</span><o:p></o:p></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Response Binding</span></b><o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo6"><span style="font-size:11.0pt">Must use the HTTP POST binding for SAML Responses. (Note – the spec mandates the HTTP Redirect binding for the SAML
<i>Request</i>, but is silent on the <i>Response</i>.)</span><o:p></o:p></li></ul>
<p class="MsoNormal"><b><span style="font-size:11.0pt"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Response Signing</span></b><o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="color:red;margin-left:0in;mso-list:l3 level1 lfo6">
<s><span style="font-size:11.0pt">Identity Providers MUST sign either the Assertion, the Response, or Both. (The current practices here are variable across providers. Does anyone think we should be more prescriptive, such as always mandating signatures on a
particular element?)</span></s><s><o:p></o:p></s></li><li class="MsoListParagraph" style="color:#00B050;margin-left:0in;mso-list:l3 level1 lfo6">
<span style="font-size:11.0pt">As per the SAML specifications, Identity Providers MUST sign the Assertion and MAY sign the Response.</span><span style="font-size:11.0pt"><o:p></o:p></span></li><li class="MsoListParagraph" style="color:#00B050;margin-left:0in;mso-list:l3 level1 lfo6">
<span style="font-size:11.0pt">Application Providers (or course) MUST validate the signature on the Assertion. If a signature is included on the Response, the Application Provider MUST validate the Response signature, too.</span><o:p></o:p></li></ul>
<p class="MsoNormal"><b><span style="font-size:11.0pt"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Signature Algorithms</span></b><o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo10"><span style="font-size:11.0pt">Minimally, SHOULD support SHA-256 Hashing</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo10"><span style="font-size:11.0pt">Minimally, SHOULD support either RSA with 2048 bit keys, or ECDSA with Curve P-256.</span><o:p></o:p></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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