A user with the permissions to create a data source can use Grafana API to create a data source with UID set to *. Doing this will grant the user access to read, query, edit and delete all data sources within the organization.
{ "binaries": [ { "binary_version": "2.6.0+dfsg-1", "binary_name": "grafana" }, { "binary_version": "2.6.0+dfsg-1", "binary_name": "grafana-data" } ] }