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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-target 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);"><span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">OpenSIPit 2021 Notes</span></span> </h1> <h2 id="OpenSIPit2021-Stir/Shaken" class="diff-block-target 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);"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Stir/Shaken</span></span> </h2> <h3 id="OpenSIPit2021-George'sNotes:" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0; margin-top: 10px"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">George's Notes:</span> </h3>
<ul class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We need to send the "dest" object in our Identity header.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We need to send a SIP "Date" header.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">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.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We need to clarify and document the 3 types of certificate expiration...</span>
<ul style="margin: 10px 0 0 0">
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We compare the current time to the timestamp sent in the Identity header and reject if there's more than </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">signature_timeout</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> seconds difference.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">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.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">OpenSSL looks at the certificate valid date range.</span> </li>
</ul> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Right now we fail if there's no "Cache-Control" or "Expires" header in the HTTP response we reject. That's not good.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We're using Base64 to encode and decode stuff and we should be using </span><a href="https://base64.guru/standards/base64url" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Base64URL</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> instead.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We should be using randomly generated UUID for every request's orgid</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We're saving certs in /var/lib/asterisk/keys/stir_shaken with the same name as in the URL. For instance: </span><a href="http://asterisk.opensipit.net/cert.pem" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">http://asterisk.opensipit.net/cert.pem</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> is saved as /var/lib/asterisk/keys/stir_shaken/cert.pem. If another request comes in like </span><a href="http://opensips.opensipit.net/cert.pem," class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">http://opensips.opensipit.net/cert.pem,</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> we overwrite Asterisk's cert.pem. We need to save the cert using the cert's serial number rather than its file name.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">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...</span>
<ul style="margin: 10px 0 0 0">
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Create a pjsip dialplan function that can set a specific SIP response code for Hangup() to use.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Split the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">stir_shaken</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> endpoint option to 2 options...</span>
<ul style="margin: 10px 0 0 0">
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">stir_shaken_attest = (yes | no)</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> to control whether we send an Identity header or not</span> </p> </li>
<li> <code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">stir_shaken_verify = ( no | permissive | enforce )</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> where </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">permissive</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> would be the behavior we have today where we leave handling the verification result it up to the dialplan author and where </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">enforcing</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> makes res_pjsip_stir_shaken automatically send back the correct response code on failure.</span> </li>
</ul> </li>
</ul> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We need enhance the STIR_SHAKEN dialplan function to add a </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">verify_result_code</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> code to get a numeric verification result code instead of the text result message.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We need to update the documentation for the STIR_SHAKEN function to include the possible result codes and messages.</span> <br /> <br /> </li>
</ul> <h2 id="OpenSIPit2021-RFC8760" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">RFC8760</span> </h2> <h3 id="OpenSIPit2021-George'sNotes:.1" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0; margin-top: 10px"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">George's Notes:</span> </h3>
<ul class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Eventually we (and pjproject) need to support the additional authentication digest algorithms defined in </span><a href="https://www.rfc-editor.org/rfc/rfc8760.html" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">RFC8760</span></a><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> which include SHA-256 and SHA512-256.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">We are not currently tolerant of RFC8760 compliant UASs that send us multiple WWW-Authenticate headers. If they send us one using SHA-256 and a second one using MD5, we fail when we see SHA-256 and don't continue to look for more WWW-Authenticate headers. I have a patch that at least makes us tolerant.</span> </li>
</ul> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> </span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> </span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> </span> </p> </td>
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