20.6. System Access Control
Presto separates the concept of the principal who authenticates to the
coordinator from the username that is responsible for running queries. When
running the Presto CLI, for example, the Presto username can be specified using
By default, the Presto coordinator allows any principal to run queries as any Presto user. In a secure environment, this is probably not desirable behavior and likely requires customization.
SystemAccessControlFactory is responsible for creating a
SystemAccessControl instance. It also defines a
name which is used by the administrator in a Presto configuration.
SystemAccessControl implementations have several responsibilities:
- Verifying whether or not a given principal is authorized to execute queries as a specific user.
- Determining whether or not a given user can alter values for a given system property.
- Determining whether or not a given user that belongs to certain groups can alter values for a given system property.
- Performing access checks across all catalogs. These access checks happen before
any connector specific checks and thus can deny permissions that would otherwise
be allowed by
The implementation of
must be wrapped as a plugin and installed on the Presto cluster.
After a plugin that implements
SystemAccessControlFactory has been installed on the coordinator, it is
configured using an
etc/access-control.properties file. All of the properties
access-control.name are specific to the
access-control.name property is used by Presto to find a registered
SystemAccessControlFactory based on the name returned by
SystemAccessControlFactory.getName(). The remaining properties are passed
as a map to
Example configuration file:
access-control.name=custom-access-control custom-property1=custom-value1 custom-property2=custom-value2