SNOW-186113: Intermittent KeyError: "No field numbered 1 is present in this asn1crypto.keys.PublicKeyInfo"

[Samira-El]

Please answer these questions before submitting your issue. Thanks!

1. What version of Python are you using (python --version)?
   Python 3.6.9

2. What operating system and processor architecture are you using (python -c 'import platform; print(platform.platform())')?
   Linux-4.15.0-1060-aws-x86_64-with-Ubuntu-18.04-bionic

3. What are the component versions in the environment (pip list)?

Package                       Version
----------------------------- ---------
asn1crypto                    1.3.0
attrs                         19.3.0
azure-common                  1.1.25
azure-storage-blob            2.1.0
azure-storage-common          2.1.0
backoff                       1.8.0
boto3                         1.10.8
botocore                      1.13.8
certifi                       2020.6.20
cffi                          1.14.0
chardet                       3.0.4
ciso8601                      2.1.3
cryptography                  2.9.2
docutils                      0.15.2
future                        0.18.2
idna                          2.7
ijson                         3.1.post0
importlib-metadata            1.7.0
inflection                    0.3.1
jmespath                      0.10.0
joblib                        0.13.2
jsonschema                    3.2.0
oscrypto                      1.2.0
pip                           20.2.2
pip-licenses                  2.2.1
pkg-resources                 0.0.0
PTable                        0.9.2
pycparser                     2.20
pycryptodomex                 3.9.8
PyJWT                         1.7.1
pyOpenSSL                     19.1.0
pyrsistent                    0.16.0
python-dateutil               2.8.1
pytz                          2020.1
requests                      2.22.0
s3transfer                    0.2.1
setuptools                    49.6.0
simplejson                    3.11.1
six                           1.15.0
snowflake-connector-python    2.0.3
urllib3                       1.24.3
zipp                          3.1.0

4. What did you do?
   Can't reproduce it, because it happens only from time to time
   I can provide the code, the error happens somewhere in this block

5. What did you expect to see?
   I expect to see no errors.

6. What did you see instead?
   Getting KeyError: 'No field numbered 1 is present in this asn1crypto.keys.PublicKeyInfo' from time to time, like 0-5 times a day.

7. Can you set logging to DEBUG and collect the logs?
   It's not easy to do for now, but here is the current logs I get

Traceback (most recent call last):
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/botocore/httpsession.py", line 263, in send
    chunked=self._chunked(request.headers),
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/urllib3/connectionpool.py", line 600, in urlopen
    chunked=chunked)
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/urllib3/connectionpool.py", line 343, in _make_request
    self._validate_conn(conn)
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/urllib3/connectionpool.py", line 839, in _validate_conn
    conn.connect()
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/urllib3/connection.py", line 344, in connect
    ssl_context=context)
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/snowflake/connector/ssl_wrap_socket.py", line 396, in ssl_wrap_socket_with_ocsp
    ).validate(server_hostname, ret.connection)
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/snowflake/connector/ocsp_snowflake.py", line 996, in validate
    return self._validate(hostname, cert_data, telemetry_data, do_retry, no_exception)
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/snowflake/connector/ocsp_snowflake.py", line 1002, in _validate
    cert_data, telemetry_data, hostname, do_retry=do_retry)
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/snowflake/connector/ocsp_snowflake.py", line 1184, in _validate_certificates_sequential
    issuer, subject, telemetry_data, hostname, do_retry=do_retry)
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/snowflake/connector/ocsp_snowflake.py", line 1066, in validate_by_direct_connection
    cert_id, req = self.create_ocsp_request(issuer, subject)
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/snowflake/connector/ocsp_asn1crypto.py", line 104, in create_ocsp_request
    'issuer_key_hash': OctetString(issuer.public_key.sha1),
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/asn1crypto/keys.py", line 1249, in sha1
    self._sha1 = hashlib.sha1(byte_cls(self['public_key'])).digest()
  File "/home/.../.virtualenvs/target-snowflake/lib/python3.6/site-packages/asn1crypto/core.py", line 3505, in __getitem__
    type_name(self)
KeyError: 'No field numbered 1 is present in this asn1crypto.keys.PublicKeyInfo'

I would really appreciate some guidance on what's going wrong.
Thanks.

[github-actions]

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[mparent61]

We're seeing a similar error too. We only saw it when we upgraded from v3.12.4 to 3.13.2, and are still seeing it with latest 3.14.0.

It's rare though, as we've only seen it ~6 times over past few months, over heavy use.

Prior to upgrading to 3.13.2, we had been running this for 8+ months without any problems.