13.4 ROLE

A role is a database object that packages a set of privileges. Roles implement the concept of access control at a group level. Multiple privileges are granted to the role and then that role can be granted to or revoked from one or many users.

A user that is granted a role must supply that role in their login credentials in order to exercise the associated privileges. Any other privileges granted to the user directly are not affected by their login with the role. Logging in with multiple roles simultaneously is not supported.

In this section the tasks of creating and dropping roles are discussed.

13.4.1 CREATE ROLE

Used forCreating a new ROLE object

Available inDSQL, ESQL

Syntax

CREATE ROLE rolename
  [SET SYSTEM PRIVILEGES TO <sys_privileges>]
 
<sys_privileges> ::=
  <sys_privilege> [, <sys_privilege> ...]
 
<sys_privilege> ::=
    USER_MANAGEMENT | READ_RAW_PAGES
  | CREATE_USER_TYPES | USE_NBACKUP_UTILITY
  | CHANGE_SHUTDOWN_MODE | TRACE_ANY_ATTACHMENT
  | MONITOR_ANY_ATTACHMENT | ACCESS_SHUTDOWN_DATABASE
  | CREATE_DATABASE | DROP_DATABASE
  | USE_GBAK_UTILITY | USE_GSTAT_UTILITY
  | USE_GFIX_UTILITY | IGNORE_DB_TRIGGERS
  | CHANGE_HEADER_SETTINGS
  | SELECT_ANY_OBJECT_IN_DATABASE
  | ACCESS_ANY_OBJECT_IN_DATABASE
  | MODIFY_ANY_OBJECT_IN_DATABASE
  | CHANGE_MAPPING_RULES | USE_GRANTED_BY_CLAUSE
  | GRANT_REVOKE_ON_ANY_OBJECT
  | GRANT_REVOKE_ANY_DDL_RIGHT
  | CREATE_PRIVILEGED_ROLES | GET_DBCRYPT_INFO
  | MODIFY_EXT_CONN_POOL | REPLICATE_INTO_DATABASE

Table 13.4.1.1 CREATE ROLE Statement Parameter

The statement CREATE ROLE creates a new role object, to which one or more privileges can be granted subsequently. The name of a role must be unique among the names of roles in the current database.

Warning

It is advisable to make the name of a role unique among usernames as well. The system will not prevent the creation of a role whose name clashes with an existing username but, if it happens, the user will be unable to connect to the database.

13.4.1.1 Who Can Create a Role

The CREATE ROLE statement can be executed by:

• Administrators

• Users with the CREATE ROLE privilege, with the following caveats

  • Setting system privileges also requires the system privilege CREATE_PRIVILEGED_ROLES

The user executing the CREATE ROLE statement becomes the owner of the role.

13.4.1.2 CREATE ROLE Examples

Creating a role named SELLERS

CREATE ROLE SELLERS;

Creating a role SELECT_ALL with the system privilege to select from any selectable object

CREATE ROLE SELECT_ALL
  SET SYSTEM PRIVILEGES TO SELECT_ANY_OBJECT_IN_DATABASE;

See alsoSection 13.4.2, ALTER ROLE, Section 13.4.3, DROP ROLE, GRANT, REVOKE, Fine-grained System Privileges

13.4.2 ALTER ROLE

Used forAltering a role

Available inDSQL

Syntax

ALTER ROLE rolename
 { SET SYSTEM PRIVILEGES TO <sys_privileges>
 | DROP SYSTEM PRIVILEGES
 | {SET | DROP} AUTO ADMIN MAPPING }
 
<sys_privileges> ::=
  !! See Section 13.4.1, CREATE ROLE !!

Table 13.4.2.1 ALTER ROLE Statement Parameter

ALTER ROLE can be used to grant or revoke system privileges from a role, or enable and disable the capability for Windows Administrators to assume administrator privileges automatically when logging in.

This last capability can affect only one role: the system-generated role RDB$ADMIN that exists in every database of ODS 11.2 or higher.

For details on auto admin mapping, see AUTO ADMIN MAPPING.

It is not possible to selectively grant or revoke system privileges. Only the privileges listed in the SET SYSTEM PRIVILEGES clause will be available to the role after commit, and DROP SYSTEM PRIVILEGES will remove all system privileges from this role.

13.4.2.1 Who Can Alter a Role

The ALTER ROLE statement can be executed by:

• Administrators

• Users with the ALTER ANY ROLE privilege, with the following caveats

  • Setting or dropping system privileges also requires the system privilege CREATE_PRIVILEGED_ROLES

  • Setting or dropping auto admin mapping also requires the system privilege CHANGE_MAPPING_RULES

13.4.2.2 ALTER ROLE Examples

Drop all system privileges from a role named SELECT_ALL

ALTER ROLE SELLERS
  DROP SYSTEM PRIVILEGES;

Grant a role SELECT_ALL the system privilege to select from any selectable object

ALTER ROLE SELECT_ALL
  SET SYSTEM PRIVILEGES TO SELECT_ANY_OBJECT_IN_DATABASE;

See alsoSection 13.4.1, CREATE ROLE, GRANT, REVOKE, Fine-grained System Privileges

13.4.3 DROP ROLE

Used forDeleting a role

Available inDSQL, ESQL

Syntax

DROP ROLE rolename

The statement DROP ROLE deletes an existing role. It takes just a single argument, the name of the role. Once the role is deleted, the entire set of privileges is revoked from all users and objects that were granted the role.

13.4.3.1 Who Can Drop a Role

The DROP ROLE statement can be executed by:

• Administrators

• The owner of the role

• Users with the DROP ANY ROLE privilege

13.4.3.2 DROP ROLE Examples

Deleting the role SELLERS

DROP ROLE SELLERS;

See alsoSection 13.4.1, CREATE ROLE, GRANT, REVOKE