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<td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 9px"><a href="https://wiki.asterisk.org/wiki/display/~gjoseph?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_56b2a47747d2721d6dcf26979b4b605a" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <h1 id="OpenSIPit2021-OpenSIPit2021Notes" class="diff-block-context" style="margin: 10px 0 0 0; margin-top: 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0; margin-top: 0"> <span style="color: rgb(133,120,102);">OpenSIPit 2021 Notes</span> </h1> <h2 id="OpenSIPit2021-Stir/Shaken" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0; margin-top: 10px"> <span style="color: rgb(133,120,102);">Stir/Shaken</span> </h2>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/images/icons/macrobrowser/dropdown/info.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Info</span></th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">REMINDER: The Asterisk STIR/SHAKEN work was all done last year before things were finalized and there hasn't been anyone to test with until now so it's nor surprising that we have interoperability issues.</span> </p> </td>
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</table> <h3 id="OpenSIPit2021-George'sNotes:" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">George's Notes:</h3>
<ul class="diff-block-context" style="margin: 10px 0 0 0">
<li>We need to send the "dest" object in our Identity header.</li>
<li>We need to send a SIP "Date" header.</li>
<li>We're not filtering bad certificate URLs. The SipVicious guys were able to send a "file:///dev/random" URL which put Asterisk into a spin loop reading random data and writing it to /var/lib/asterisk/keys/stir_shaken/random.</li>
<li>We need to clarify and document the 3 types of certificate expiration...
<ul style="margin: 10px 0 0 0; margin-top: 0">
<li>We compare the current time to the timestamp sent in the Identity header and reject if there's more than <code style="font-family: monospace">signature_timeout</code> seconds difference.</li>
<li>When we retrieve the certificate using the URL in the Identity header, we compare the HTTP "Cache-Control" "max-age" parameter or the Expires header to the time we cached the certificate the last time we retrieved it.</li>
<li>OpenSSL looks at the certificate valid date range.</li>
</ul> </li>
<li>Right now we fail if there's no "Cache-Control" or "Expires" header in the HTTP response we reject. That's not good.</li>
<li>We're using Base64 to encode and decode stuff and we should be using <a href="https://base64.guru/standards/base64url" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">Base64URL</a> instead.</li>
<li>We should be using randomly generated UUID for every request's orgid</li>
<li>We're saving certs in /var/lib/asterisk/keys/stir_shaken with the same name as in the URL. For instance: <a href="http://asterisk.opensipit.net/cert.pem" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://asterisk.opensipit.net/cert.pem</a> is saved as /var/lib/asterisk/keys/stir_shaken/cert.pem. If another request comes in like <a href="http://opensips.opensipit.net/cert.pem," class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://opensips.opensipit.net/cert.pem,</a> we overwrite Asterisk's cert.pem. We need to save the cert using the cert's serial number rather than its file name.</li>
<li>There are some error situations where the RFC says we MUST return a certain response code but we're leaving it to the dialplan author to check and reject and there's currently no way for the dialplan author to send specific SIP response codes. I suggest we do 2 things...
<ul style="margin: 10px 0 0 0; margin-top: 0">
<li>Create a pjsip dialplan function that can set a specific SIP response code for Hangup() to use.</li>
<li>Split the <code style="font-family: monospace">stir_shaken</code> endpoint option to 2 options...
<ul style="margin: 10px 0 0 0">
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">stir_shaken_attest = (yes | no)</code> to control whether we send an Identity header or not</p> </li>
<li> <code style="font-family: monospace">stir_shaken_verify = ( no | permissive | enforce )</code> where <code style="font-family: monospace">permissive</code> would be the behavior we have today where we leave handling the verification result it up to the dialplan author and where <code style="font-family: monospace">enforcing</code> makes res_pjsip_stir_shaken automatically send back the correct response code on failure.</li>
</ul> </li>
</ul> </li>
<li>We need enhance the STIR_SHAKEN dialplan function to add a <code style="font-family: monospace">verify_result_code</code> code to get a numeric verification result code instead of the text result message.</li>
<li>We need to update the documentation for the STIR_SHAKEN function to include the possible result codes and messages.<br /> <br /> </li>
</ul> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> </td>
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