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Logging out of Google Cloud seems like it should be easy. If I run:

$ unset GOOGLE_APPLICATION_CREDENTIALS

$ gcloud auth revoke --all
Revoked credentials:
  - [my account]
$ gcloud auth list

No credentialed accounts.

To login, run:
  $ gcloud auth login `ACCOUNT`

It at first looks like I'm completely logged out of gcloud. But watch what happens when I open a Python shell:

>>> from google.cloud import secretmanager_v1beta1 as secretmanager
>>> client = secretmanager.SecretManagerServiceClient()
/Users/my/path/.venv/lib/python3.7/site-packages/google/auth/_default.py:66: UserWarning: Your application has authenticated using end user credentials from Google Cloud SDK. We recommend that most server applications use service accounts instead. If your application continues to use end user credentials from Cloud SDK, you might receive a "quota exceeded" or "API not enabled" error. For more information about service accounts, see https://cloud.google.com/docs/authentication/
  warnings.warn(_CLOUD_SDK_CREDENTIALS_WARNING)
>>> path = client.secret_version_path(project="my-project-name", secret="my-secret", secret_version="latest")
>>> secret = client.access_secret_version(path)
>>> secret.payload.data.decode()
"Oh, no! I should be secret!"

As you can see, even though I ran gcloud auth revoke --all I'm still able to access Google Cloud through the Python SDK using user credentials that are stored somewhere. Is there a way to completely logout of Google Cloud on my laptop?

EDIT: to clarify further: there aren't any Google Cloud Service account JSON files saved on this computer, and I've unset the GOOGLE_APPLICATION_CREDENTIALS environment variable.

Joshmaker
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  • I would like to know from where are you revoking access to your accounts. Is it from Google Cloud Shell? Or perhaps from your local machine? Thank you. – Christopher Rodriguez Conde Feb 04 '20 at 09:40
  • @ChristopherRodriguezConde all the commands here are running locally on my MacBook (good ol' zsh in iTerm). – Joshmaker Feb 05 '20 at 22:05
  • I see no relation between the Client Libraries and the fact you revoke access using the `gcloud` command. `gcloud revoke --all` will sign out you to use any `gcloud` command if I am not mistaken, while for 'logging out' in the sense you would like to control access to the Client Libraries use service accounts, and assign those service accounts to your end-users, but I think there's no relation between revoking access and actually running the Python's Client Libraries. I hope it helps. – Christopher Rodriguez Conde Feb 06 '20 at 09:24
  • @ChristopherRodriguezConde but there _is_ a relationship because if these isn't a service account it will default to using the `gcloud` authorization credentials. My goal is to be completely logged out such that the SDK is unable to authenticate, which includes not having any service account files. – Joshmaker Feb 07 '20 at 19:41

2 Answers2

6

I'm not sure if this will help you in any way but I ran into a similar issue. Once I had revoked the all credentials using the command "gcloud auth revoke --all" I was still able the execute scripts against my environment. In the end, I found the application default credentials file locating in ~/.config/gcloud/application_default_credentials.json. Renaming / Deleting this file help to remove the client library's ability to the authentication. I no get the follow

  File "audit_test.py", line 8, in main
    client = resource_manager.Client()
  File "fake_path/python3.7/site-packages/google/cloud/resource_manager/client.py", line 72, in __init__
    super(Client, self).__init__(credentials=credentials, _http=_http)
  File "fake_path/python3.7/site-packages/google/cloud/client.py", line 132, in __init__
    credentials, _ = google.auth.default()
  File "fake_path/python3.7/site-packages/google/auth/_default.py", line 321, in default
    raise exceptions.DefaultCredentialsError(_HELP_MESSAGE)
google.auth.exceptions.DefaultCredentialsError: Could not automatically determine credentials. Please set GOOGLE_APPLICATION_CREDENTIALS or explicitly create credentials and re-run the application. For more information, please see https://cloud.google.com/docs/authentication/getting-started
Mícheál Ó Laoghaire
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    There is a command `gcloud auth application-default revoke` which revokes the credentials in that file (and all copies of that file) – charles-allen Nov 10 '20 at 02:26
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As commented above by AjahnCharles, gcloud auth application-default revoke works. Just hit the command and it will remove the application-default creds. See the difference here. I had the same problem and only this worked.

Edit:

Remember that you still need to call gcloud auth revoke --all as gcloud auth application-default revoke only removes the application-default creds.

guneetgstar
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