<div dir="ltr">Hi Bogdan,<div><br></div><div>Thanks for your response, based on your advice I performed a full packet capture on the handshake and established that a certificate was indeed being presented.</div><div><br></div><div>Following up on this I managed to establish that the problem was a missing intermediary CA in the certificate chain, specifically:</div><div><br></div><div><a href="https://support.comodo.com/index.php?/Knowledgebase/Article/View/975/108/intermediate-2-sha-2-comodo-rsa-extended-validation-secure-server-ca">https://support.comodo.com/index.php?/Knowledgebase/Article/View/975/108/intermediate-2-sha-2-comodo-rsa-extended-validation-secure-server-ca</a><br></div><div><br></div><div>The error message presented by OpenSIPs was certainly misleading in this case. For others benefit the approach for installing a new CA is super simple:</div><div><ol><li>create the file in /etc/pki/ca-trust/source/anchors (i.e. comodo-ca-rsa-ev-secure-server.pem)<br></li><li>run "update-ca-trust" with root privs</li></ol><div>Problem solved.</div></div><div><br></div><div>Have a good day all!</div><div><br></div><div>Callum</div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Jul 25, 2017 at 2:48 PM Bogdan-Andrei Iancu <<a href="mailto:bogdan@opensips.org">bogdan@opensips.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<tt>Hi Callum,<br>
<br>
The error may indicate the fact that the TLS client does not
present a TLS certificate while connection to your OpenSIPS. This
has nothing to do with the TLS multi domain, which anyhow is
supported. As the test, you can create a separate TLS domain
(server) bound to the IP of that TLS client, TLS domain having the
require_certificate option turned off.<br>
<br>
Best Regards,<br>
</tt>
<pre class="m_-1847085509171715036moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="m_-1847085509171715036moz-txt-link-freetext" href="http://www.opensips-solutions.com" target="_blank">http://www.opensips-solutions.com</a>
OpenSIPS Bootcamp 2017, Houston, US
<a class="m_-1847085509171715036moz-txt-link-freetext" href="http://opensips.org/training/OpenSIPS_Bootcamp_2017.html" target="_blank">http://opensips.org/training/OpenSIPS_Bootcamp_2017.html</a>
</pre></div><div bgcolor="#FFFFFF" text="#000000">
<div class="m_-1847085509171715036moz-cite-prefix">On 07/25/2017 03:26 PM, Callum Guy
wrote:<br>
</div>
</div><div bgcolor="#FFFFFF" text="#000000"><blockquote type="cite">
<div dir="ltr">Hi All,
<div><br>
</div>
<div><b>Running: </b>opensips-2.3.1-1.el7.x86_64 / CentOS 7</div>
<div><br>
</div>
<div>I have been working with new TLS connection and have been
having problems validating their client certificate. My
OpenSIPs configuration works fine for other providers (i.e.
Twilio) however I am seeing the following error messages
reported while verify_cert is enabled:</div>
<div><br>
</div>
<div>
<div><font face="monospace">Jul 25 13:10:32 <a href="http://proxy.ex.com" target="_blank">proxy.ex.com</a>
opensips[4881]: NOTICE:tls_mgm:verify_callback: depth = 0</font></div>
<div><font face="monospace">Jul 25 13:10:32 <a href="http://proxy.ex.com" target="_blank">proxy.ex.com</a>
opensips[4881]: NOTICE:tls_mgm:verify_callback: subject =
/serialNumber=03379831/1.3.6.1.4.1.311.60.2.1.3=GB/businessCategory=Private
Organization/C=GB/postalCode=SO16
7NP/L=Southampton/street=2 Venture Road/O=SIMWOOD ESMS
LIMITED/OU=COMODO EV Multi-Domain SSL/CN=<a href="http://simwood.com" target="_blank">simwood.com</a></font></div>
<div><font face="monospace">Jul 25 13:10:32 <a href="http://proxy.ex.com" target="_blank">proxy.ex.com</a>
opensips[4881]: NOTICE:tls_mgm:verify_callback: verify
error:num=20:unable to get local issuer certificate</font></div>
<div><font face="monospace">Jul 25 13:10:32 <a href="http://proxy.ex.com" target="_blank">proxy.ex.com</a>
opensips[4881]: NOTICE:tls_mgm:verify_callback: something
wrong with the cert ... error code is 20 (check
x509_vfy.h)</font></div>
<div><font face="monospace">Jul 25 13:10:32 <a href="http://proxy.ex.com" target="_blank">proxy.ex.com</a>
opensips[4881]: NOTICE:tls_mgm:verify_callback: verify
return:0</font></div>
<div><font face="monospace">Jul 25 13:10:32 <a href="http://proxy.ex.com" target="_blank">proxy.ex.com</a>
opensips[4881]: ERROR:proto_tls:tls_accept: New TLS
connection from <a href="http://178.22.140.34:34281" target="_blank">178.22.140.34:34281</a> failed to
accept</font></div>
<div><font face="monospace">Jul 25 13:10:32 <a href="http://proxy.ex.com" target="_blank">proxy.ex.com</a>
opensips[4881]: ERROR:proto_tls:tls_print_errstack: TLS
errstack: error:140890B2:SSL
routines:SSL3_GET_CLIENT_CERTIFICATE:no certificate
returned</font></div>
<div><font face="monospace">Jul 25 13:10:32 <a href="http://proxy.ex.com" target="_blank">proxy.ex.com</a>
opensips[4881]: ERROR:proto_tls:tls_read_req: failed to do
pre-tls reading</font></div>
</div>
<div><br>
</div>
<div>Part of my reason for resorting to the mailing list are old
mailing list emails discussing that multi-domain certificates
are not supported by OpenSIPs - is anyone able to confirm if
this remains a problem?</div>
<div><br>
</div>
<div>The openssl error code 20 is translated as <span style="color:rgb(111,66,193);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;white-space:pre-wrap">X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY</span></div>
<div><br>
</div>
<div>I have seen other reports that this issue may be related to
an improperly chained certificate - does this sound at all
likely?</div>
<div><br>
</div>
<div>Any tips on debugging would be greatly appreciated, thanks.</div>
<div><br>
</div>
<div>Callum</div>
</div>
<div dir="ltr">-- <br>
</div>
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