test_x509: test very long OID

Active Directory creates OIDs long enough to trigger a failure.
This can cause e.g. ipa-server-install failure when installing
with an externally-signed CA.

https://pagure.io/freeipa/issue/7300

Reviewed-By: Christian Heimes <cheimes@redhat.com>

ipatests/test_ipalib/test_x509.py

@@ -26,6 +26,7 @@ import datetime
 
 import pytest
 
+from cryptography import x509 as crypto_x509
 from ipalib import x509
 from ipapython.dn import DN
 
@@ -85,6 +86,41 @@ good_pkcs7 = (
     b'-----END PKCS7-----'
 )
 
+long_oid_cert = b'''
+-----BEGIN CERTIFICATE-----
+MIIFiTCCBHGgAwIBAgITSAAAAAd1bEC5lsOdnQAAAAAABzANBgkqhkiG9w0BAQsF
+ADBLMRUwEwYKCZImiZPyLGQBGRYFbG9jYWwxEjAQBgoJkiaJk/IsZAEZFgJhZDEe
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+PL25as32r3S/m4uWqoQaK0lxK5Y97eusK2rrmidy32Jctzwl29UWq8kpjRAuD8iR
+CSc7sKqOf+fn3+fKITR2/DcSVvb0SGCr5fVVnjQ=
+-----END CERTIFICATE-----
+'''
+
 
 class test_x509(object):
     """
@@ -151,3 +187,18 @@ class test_x509(object):
         cert = certlist[0]
         assert DN(cert.subject) == DN('CN=Certificate Authority,O=EXAMPLE.COM')
         assert cert.serial_number == 1
+
+    def test_long_oid(self):
+        """
+        Test cerificate with very long OID. In this case we are using a
+        certificate from an opened case where one of X509v3 Certificate`s
+        Policies OID is longer then 80 chars.
+        """
+        cert = x509.load_pem_x509_certificate(long_oid_cert)
+        ext = cert.extensions.get_extension_for_class(crypto_x509.
+                                                      CertificatePolicies)
+
+        assert len(ext.value) == 1
+        assert ext.value[0].policy_identifier.dotted_string == (
+            u'1.3.6.1.4.1.311.21.8.8950086.10656446.2706058.12775672.480128.'
+            '147.13466065.13029902')