Copying my answer from https://stackoverflow.com/a/70217282/9583820
It looks like instead of creating Airflow accounts with
gcloud composer environments run
You can just use GCP service accounts with email length <64 symbols.
It will work automatically under those conditions:
TL'DR version:
In order to make Airflow Stable API work at GCP Composer:
- Set "api-auth_backend" to "airflow.composer.api.backend.composer_auth"
- Make sure your service account email length is <64 symbols
- Make sure your service account has required permissions (Composer User role should be sufficient)
Longread:
We are using Airflow for a while now, and started with version 1.x.x with "experimental" (now deprecated) API's.
To Authorize, we are using "Bearer" token obtained with service account:
# Obtain an OpenID Connect (OIDC) token from metadata server or using service account.
google_open_id_connect_token = id_token.fetch_id_token(Request(), client_id)
# Fetch the Identity-Aware Proxy-protected URL, including an
# Authorization header containing "Bearer " followed by a
# Google-issued OpenID Connect token for the service account.
resp = requests.request(
method, url,
headers={'Authorization': 'Bearer {}'.format(
google_open_id_connect_token)}, **kwargs)
Now we are migrating to Airflow 2.x.x and faced with exact same issue:
403 FORBIDDEN.
Our environment details are:
composer-1.17.3-airflow-2.1.2 (Google Cloud Platform)
"api-auth_backend" is set to "airflow.api.auth.backend.default".
Documentation claims that:
After you set the api-auth_backend configuration option to airflow.api.auth.backend.default, the Airflow web server accepts all API requests without authentication.
However, this does not seem to be true.
In experimental way, we found that if "api-auth_backend" is set to "airflow.composer.api.backend.composer_auth", Stable REST API (Airflow 2.X.X) starting to work.
But there is other caveat to this: for us, some of our service accounts did work, and some did not.
The ones that did not work were throwing "401 Unauthorized" error.
We figured out that accounts having email length > 64 symbols were throwing error. Same was observed at this answer.
So after setting "api-auth_backend" to "airflow.composer.api.backend.composer_auth" and making sure that our service account email length is <64 symbols - our old code for Airflow 1.x.x started to work for Authentication. Then we needed to make changes (API URLs and response handling) and stable Airflow (2.x.x) API started to work for us
in the same way as it was for Airflow 1.x.x.
UPD: this is a defect in Airflow and will be fixed here:
https://github.com/apache/airflow/pull/19932