SECURITY LABEL

SECURITY LABEL

SECURITY LABEL

7

SQL - Language Statements

SECURITY LABEL

define or change a security label applied to an object

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.

[!NOTE] register_label_provider is not an SQL function; it can only be called from C code loaded into the backend.

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.

You must own the database object to use SECURITY LABEL.

Parameters#

\<object_name>; \<table_name.column_name>; \<aggregate_name>; \<function_name>; \<procedure_name>; \<routine_name>
The name of the object to be labeled. Names of objects that reside in schemas (tables, functions, etc.) can be schema-qualified.

\<provider>
The name of the provider with which this label is to be associated. The named provider must be loaded and must consent to the proposed labeling operation. If exactly one provider is loaded, the provider name may be omitted for brevity.

\<argmode>
The mode of a function, procedure, or aggregate argument: IN, OUT, INOUT, or VARIADIC. If omitted, the default is IN. Note that SECURITY LABEL does not actually pay any attention to OUT arguments, since only the input arguments are needed to determine the function's identity. So it is sufficient to list the IN, INOUT, and VARIADIC arguments.

\<argname>
The name of a function, procedure, or aggregate argument. Note that SECURITY LABEL does not actually pay any attention to argument names, since only the argument data types are needed to determine the function's identity.

\<argtype>
The data type of a function, procedure, or aggregate argument.

\<large_object_oid>
The OID of the large object.

PROCEDURAL
This is a noise word.

\<string_literal>
The new setting of the security label, written as a string literal.

NULL
Write NULL to drop the security label.

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#

src/test/modules/dummy_seclabel