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Looks like when F25 upgraded from python-rhsm 1.19.0 to 1.19.4, our tests started failing:

rhsm.https: DEBUG: Using standard libs to provide httplib and ssl
rhsm.certificate2: ERROR: 'NoneType' object has no attribute 'decode'
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/rhsm/certificate2.py", line 99, in _read_x509
    return self._create_v1_cert(version, extensions, x509, path)
  File "/usr/lib64/python2.7/site-packages/rhsm/certificate2.py", line 114, in _create_v1_cert
    return self._create_identity_cert(version, extensions, x509, path)
  File "/usr/lib64/python2.7/site-packages/rhsm/certificate2.py", line 137, in _create_identity_cert
    alt_name=self._read_alt_name(x509),
  File "/usr/lib64/python2.7/site-packages/rhsm/certificate2.py", line 121, in _read_alt_name
    return x509.get_extension(name='subjectAltName').decode('utf-8')
AttributeError: 'NoneType' object has no attribute 'decode'


Looks like the following change was introduced in that timeframe:

https://github.com/candlepin/python-rhsm/commit/f3164e32a5aae288a1ef73f3c16f46f60d0cb1b1#diff-b89afd85b4d5ab2767749c609cab6374R118

PR:

https://github.com/candlepin/subscription-manager/pull/1606

This same code and environment using the previous python-rhsm version returns valid data from 509.get_extension(name='subjectAltName'). So receiving None is unexpected. Since it works with older versions in the F25 environment, I'm thinking it is a regression that affects either F25 as an environment or all environments.

I think this is a dupe of https://bugzilla.redhat.com/show_bug.cgi?id=1426343

*** This bug has been marked as a duplicate of bug 1426343 ***