<p>I cant find a relevant rfc or something similiar, but it seems to be quite common to me...</p>
<p>see:</p>
<ul>
<li><a href="https://www.cryptosys.net/pki/manpki/pki_distnames.html" rel="nofollow">https://www.cryptosys.net/pki/manpki/pki_distnames.html</a></li>
<li><a href="http://www.modssl.org/docs/2.4/ssl_reference.html" rel="nofollow">http://www.modssl.org/docs/2.4/ssl_reference.html</a> (search SSL_CLIENT_S_DN_UID)</li>
</ul>
<p>Or to ask from the other side... where would you put your username inside of the certificate?<br>
In our case the CN contains the full name of the user...</p>

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