NAME¶

SECURITY_LABEL - define or change a security label applied to an object

SYNOPSIS¶

SECURITY LABEL [ FOR provider ] ON
{


  TABLE object_name |


  COLUMN table_name.column_name |


  AGGREGATE aggregate_name ( aggregate_signature ) |


  DATABASE object_name |


  DOMAIN object_name |


  EVENT TRIGGER object_name |


  FOREIGN TABLE object_name |


  FUNCTION function_name [ ( [ [ argmode ] [ argname ] argtype [, ...] ] ) ] |


  LARGE OBJECT large_object_oid |


  MATERIALIZED VIEW object_name |


  [ PROCEDURAL ] LANGUAGE object_name |


  PROCEDURE procedure_name [ ( [ [ argmode ] [ argname ] argtype [, ...] ] ) ] |


  PUBLICATION object_name |


  ROLE object_name |


  ROUTINE routine_name [ ( [ [ argmode ] [ argname ] argtype [, ...] ] ) ] |


  SCHEMA object_name |


  SEQUENCE object_name |


  SUBSCRIPTION object_name |


  TABLESPACE object_name |


  TYPE object_name |


  VIEW object_name
} IS { string_literal | NULL }
where aggregate_signature is:
* |
[ argmode ] [ argname ] argtype [ , ... ] |
[ [ argmode ] [ argname ] argtype [ , ... ] ] ORDER BY [ argmode ] [ argname ] argtype [ , ... ]

DESCRIPTION¶

SECURITY LABEL applies a security label to a database object. An arbitrary number of security labels, one per label provider, can be associated with a given database object. Label providers are loadable modules which register themselves by using the function register_label_provider.

The label provider determines whether a given label is valid and whether it is permissible to assign that label to a given object. The meaning of a given label is likewise at the discretion of the label provider. PostgreSQL places no restrictions on whether or how a label provider must interpret security labels; it merely provides a mechanism for storing them. In practice, this facility is intended to allow integration with label-based mandatory access control (MAC) systems such as SELinux. Such systems make all access control decisions based on object labels, rather than traditional discretionary access control (DAC) concepts such as users and groups.

PARAMETERS¶

object_name
table_name.column_name
aggregate_name
function_name
procedure_name
routine_name

provider

argmode

argname

argtype

large_object_oid

PROCEDURAL

string_literal

NULL

EXAMPLES¶

The following example shows how the security label of a table could be set or changed:

SECURITY LABEL FOR selinux ON TABLE mytable IS 'system_u:object_r:sepgsql_table_t:s0';

To remove the label:

SECURITY LABEL FOR selinux ON TABLE mytable IS NULL;

COMPATIBILITY¶

There is no SECURITY LABEL command in the SQL standard.

SEE ALSO¶

sepgsql, src/test/modules/dummy_seclabel