The Service Does Not Have Access to Key Vault
We were recently working on a project that required us to access a Key Vault from a Cloud Function. We were able to successfully create the Key Vault and store a secret in it, but when we tried to access the secret from the Cloud Function, we got an error message saying that the service account associated with the Cloud Function did not have access to the Key Vault.
We were initially confused by this error message because we had created the Key Vault with the same project ID as the Cloud Function. However, after some research, we discovered that the service account associated with the Cloud Function is different from the project ID. The service account is a unique identity that is created for each Cloud Function, and it is this service account that needs to be granted access to the Key Vault.
Granting Access to the Service Account
To grant the service account access to the Key Vault, we need to add it as a member of the Key Vault’s access control list (ACL). We can do this using the Google Cloud console or the Cloud IAM API.
To grant access using the Google Cloud console, follow these steps:
- Navigate to the Key Vault in the Google Cloud console.
- Click on the “Permissions” tab.
- Click on the “Add member” button.
- Enter the email address of the service account in the “New members” field.
- Select the “CryptoKeyDecrypter” role from the “Role” drop-down menu.
- Click on the “Save” button.
To grant access using the Cloud IAM API, use the following syntax:
gcloud iam service-accounts add-iam-policy-binding \
--service-account=$SERVICE_ACCOUNT \
--role=roles/cloudkms.cryptoKeyDecrypter \
--member=serviceAccount:$KEY_VAULT_SERVICE_ACCOUNTTesting Access
Once we have granted the service account access to the Key Vault, we can test access by trying to retrieve the secret from the Cloud Function.
If we are able to successfully retrieve the secret, then we know that the service account has been granted access to the Key Vault.
Conclusion
In this blog post, we have discussed how to grant a service account access to a Key Vault. We have also provided examples of how to do this using the Google Cloud console and the Cloud IAM API.
We hope that this blog post has been helpful. If you have any questions, please feel free to leave a comment below.
Are you interested in learning more about Key Vault?
If so, we recommend checking out the following resources:
- Google Cloud Key Vault
- Creating and Managing Service Account Keys
- Granting Access to Service Accounts
FAQ
Q: What is a service account?
A: A service account is a unique identity that is created for each Cloud Function. It is this service account that needs to be granted access to the Key Vault.
Q: How do I grant a service account access to a Key Vault?
A: You can grant a service account access to a Key Vault using the Google Cloud console or the Cloud IAM API.
Q: How do I test access to a Key Vault?
A: You can test access to a Key Vault by trying to retrieve a secret from the Cloud Function.
