GitHub Actions now lets you control the permissions granted to the GITHUB_TOKEN secret.
The GITHUB_TOKEN is an automatically generated secret that lets you make authenticated calls to the GitHub API in your workflow runs. Actions generates a new token for each job and expires the token when a job completes. The token has write permissions to a number of API endpoints except in the case of pull requests from forks which are always read. These new settings allow you to follow a principle of least privilege in your workflows.
Setting permissions in the workflow
A new permissions key supported at the workflow and job level enables you to specify which permissions you want for the token. Any permission that is absent from the list will be set to none.
permissions:
actions: read|write|none
checks: read|write|none
contents: read|write|none
deployments: read|write|none
issues: read|write|none
packages: read|write|none
pull-requests: read|write|none
repository-projects: read|write|none
security-events: read|write|none
statuses: read|write|nonePull requests from public forks are still considered a special case and will receive a read token regardless of these settings.
Setting the default permissions for the organization or repository
A new admin setting lets you set the default permissions for the token in your organization or repository.
You can choose between two options:
- Read/write for all scopes (current default)
- Read repo contents
Setting the default to contents:read is sufficient for any workflows that simply need to clone and build. If you need additional permissions you will need to specify those in your workflow yaml.
Learn more about setting the token permissions
