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<p class="MsoNormal"><span style="font-size:11.0pt">Hi group,<o:p></o:p></span></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.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">--------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">[Rough-draft]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Replay Attack Mitigation<o:p></o:p></span></b></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l4 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.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l4 level1 lfo3"><span style="font-size:11.0pt">Application Providers MUST validate the Condition is satisfied.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Response Binding<o:p></o:p></span></b></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo4"><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>.)<b><o:p></o:p></b></span></li></ul>
<p class="MsoNormal"><b><span style="font-size:11.0pt"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Response Signing<o:p></o:p></span></b></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo4"><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?)<b><o:p></o:p></b></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo4"><span style="font-size:11.0pt">Application Providers (or course) MUST ensure signatures exist and are valid.<b><o:p></o:p></b></span></li></ul>
<p class="MsoNormal"><b><span style="font-size:11.0pt"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Signature Algorithms<o:p></o:p></span></b></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo5"><span style="font-size:11.0pt">Minimally, SHOULD support SHA-256 Hashing<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo5"><span style="font-size:11.0pt">Minimally, SHOULD support either RSA with 2048 bit keys, or ECDSA with Curve P-256.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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