CkPython

Get Certificate User Principal Name (UPN)

See more Certificates Examples

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.

CkPython

import sys
import chilkat

success = False

cert = chilkat.CkCert()

success = cert.LoadFromFile("qa_data/certs/sample.cer")
if (success == False):
    print(cert.lastErrorText())
    sys.exit()

xml = chilkat.CkXml()
xml.LoadXml(cert.subjectAlternativeName())
print(xml.getXml())

# 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.")
else:
    print("User Principle Name = " + upn)