<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman",serif;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:"Courier New";}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have setup Squid as a SSL MITM proxy.<o:p></o:p></p>
<p class="MsoNormal">I am also using the cert download feature with these configurations in my squid.conf<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">acl cert_fetch transaction_initiator certificate-fetching<o:p></o:p></p>
<p class="MsoNormal">http_access allow cert_fetch<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Websites where certificates just share AIA information using CA-issuer method, those work just fine.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But try this one, <a href="https://community.verizonwireless.com/welcome">
https://community.verizonwireless.com/welcome</a> (this gets bumped in my setup)<o:p></o:p></p>
<p class="MsoNormal">Here the AIA information Is provided using both OCSP/CAissuer methods.<o:p></o:p></p>
<p class="MsoNormal">From Squid’s access logs, I can tell that the certificate gets downloaded.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">1526964147.929 160 - TCP_MISS/200 1868 GET http://cacert.omniroot.com/vpssg142.crt - HIER_DIRECT/64.18.25.46 application/x-x509-ca-cert<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But squid still reports<b><span style="font-size:10.5pt;color:#3B434A">:<o:p></o:p></span></b></p>
<pre style="background:white"><b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:#3B434A">(71) Protocol error (TLS code: X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY)<br></span></b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:#3B434A">SSL Certficate error: certificate issuer (CA) not known: /C=NL/L=Amsterdam/O=Verizon Enterprise Solutions/OU=Cybertrust/CN=Verizon Public SureServer CA G14-SHA2<o:p></o:p></span></pre>
<p class="MsoNormal"><b><span style="font-size:10.5pt;color:#3B434A"><o:p> </o:p></span></b></p>
<p class="MsoNormal">That is the only intermediate certificate needed in the chain. Here:
<a href="https://www.ssllabs.com/ssltest/analyze.html?d=community.verizonwireless.com&latest">
https://www.ssllabs.com/ssltest/analyze.html?d=community.verizonwireless.com&latest</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I download the intermediate certificate locally and try connecting to the remote server using openssl –Cafile option, Openssl reports OK (0).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">openssl s_client -connect 204.93.84.201:443 -showcerts -CAfile vpssg142.crt –servername community.verizon.com<o:p></o:p></p>
<p class="MsoNormal">>> Verify return code: 0 (ok)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Sarfaraz<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>