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<div class="moz-cite-prefix">On 11/11/16 9:33 AM, Roehrl Patrick
wrote:<br>
</div>
<blockquote
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Yeah
the XML contains also the signature information
(SignatureValue, SignedInfo, KeyInfo) and that makes it so
big. And the request contains also the signature as
parameter…so seems like a signature too much.</span></p>
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</blockquote>
<br>
Ok, that confirms that the SP is broken. An XML signature on the
protocol message is not allowed, per the Redirect DEFLATE binding.
A signature on an embedded child object (which is very unlikely with
an AuthnRequest) isn't technically disallowed, but in practice means
you can't use such a message with the Redirect binding. See SAML 2
Bindings spec, section 3.4.4.1:<br>
<br>
"Any signature on the SAML protocol message, including the
<ds:Signature> XML element itself,<br>
MUST be removed. Note that if the content of the message includes
another signature, such as a<br>
signed SAML assertion, this embedded signature is not removed.
However, the length of such a<br>
message after encoding essentially precludes using this mechanism.
Thus SAML protocol<br>
messages that contain signed content SHOULD NOT be encoded using
this mechanism."<br>
<br>
<br>
<br>
<blockquote type="cite">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">So
our SP uses the wrong binding for Redirect.</span></p>
</blockquote>
<br>
It's more correct to say that their implementation of the Redirect
DEFLATE binding is broken. It should not emit a protocol message
with the XML signature, period.<br>
<br>
<blockquote type="cite">
<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">POST
Binding
</span><span
style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">à</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
embedded signature in XML<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Redirect
Binding
</span><span
style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">à</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
signature as request parameter<o:p></o:p></span></p>
<span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This
would be correct?</span></blockquote>
<br>
Yes, that's essentially correct. <br>
<br>
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