Permissions Conventions

Historical Context

We utilize the DeclarativePolicy framework for authorization in GitLab, making it straightforward to add new permissions. Until 2024, there was no clear guidance on when to introduce new permissions and how to name them. This lack of direction is a significant reason why the number of permissions has become unmanageable.

The purpose of this document is to provide guidance on:

  • When to introduce a new permission and when to reuse an existing one
  • How to name new permissions
  • What should be included in the Policy classes and what should not

Introducing New Permissions

Introduce a new permission only when absolutely necessary. Always try to use an existing one first. For example, there’s no need for a read_issue_description permission when we already have read_issue, and both require the same role. Similarly, with create_pipeline available, we don’t need create_build.

When introducing a new permission, always attempt to follow the naming conventions. Try to create a general permission, not a specific one, eg. it is better to add a permission create_member_role than create_member_role_name. If you’re unsure, consult a Backend Engineer from the Govern:Authorization team for advice or approval for exceptions.

Naming Permissions

Our goal is for all permissions to follow a consistent pattern: verb-feature(-subfeature). The feature and subfeature should always be in the singular. Additionally, we aim to limit the verbs used to ensure clarity. The preferred verbs are:

  • create - for creating an object, e.g., create_issue
  • read - for reading an object, e.g., read_issue.
  • update - for updating an object, e.g., update_issue.
  • delete - for deleting an object, eg. delete_issue.
  • push and download - these are specific verbs for file-related permissions. Other industry terms can be permitted after a justification.

We recognize that this set of verbs is limited and not applicable to every feature. Here are some verbs that, while necessary, could potentially be rephrased to align with the above conventions:

  • approve - e.g., approve_merge_request. Though approve suggests a lower role than manage, it could be rephrased as create_merge_request_approval.

Preferred Verbs

  • create is preferred over build or import
  • read is preferred over access
  • push is preferred over upload

Exceptions

If you believe a new permission is needed that does not follow these conventions, consult the Govern:Authorization team. We’re always open to discussion, these guidelines are meant to make the work of Engineers easier, not to complicate it.

What to Include in Policy Classes

Role

Policy classes should include checks for both predefined and custom roles.

Examples: 

rule { developer } # Static role check
rule { can?(:developer_access) } # Another approach used in some classes
rule { custom_role_enables_read_dependency } # Custom role check

Include checks that vary based on the current user’s relationship with the object, such as being an assignee or author.

Examples: 

rule { is_author }.policy do
  enable :read_note
  enable :update_note
  enable :delete_note
end