(Ruby) Get Certificate User Principal Name (UPN)

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Demonstrates how to get a certificate's UPN from the SAN (Subject Alternative Name). Most certificates do not have a UPN. This example only applies to those certificates that have a User Principal Name.

Note: This example requires Chilkat v9.5.0.90 or greater due to fixes made in getting the UPN from the SAN.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

cert = Chilkat::CkCert.new()

success = cert.LoadFromFile("qa_data/certs/sample.cer")
if (success == false)
    print cert.lastErrorText() + "\n";
    exit
end

xml = Chilkat::CkXml.new()
xml.LoadXml(cert.subjectAlternativeName())
print xml.getXml() + "\n";

# A certificate with a User Principal Name in the SAN might have this:

# <SubjectAltName>
#     <rfc822Name>joe@example.com</rfc822Name>
#     <name type="oid" oid="1.3.6.1.4.1.311.20.2.3">joe@example.com</name>
# </SubjectAltName>

# The OID 1.3.6.1.4.1.311.20.2.3 is for the User Principal Name.
upn = xml.chilkatPath("/A/name,oid,1.3.6.1.4.1.311.20.2.3|*")
if (xml.get_LastMethodSuccess() == false)
    print "No user principle name." + "\n";
else
    print "User Principle Name = " + upn + "\n";
end