SECURITY LABEL
SECURITY LABEL
SECURITY LABEL - define or change a security label applied to an object
Synopsis
SECURITY LABEL [ FORprovider
] ON { TABLEobject_name
| COLUMNtable_name
.column_name
| AGGREGATEaggregate_name
(aggregate_signature
) | DATABASEobject_name
| DOMAINobject_name
| EVENT TRIGGERobject_name
| FOREIGN TABLEobject_name
| FUNCTIONfunction_name
[ ( [ [argmode
] [argname
]argtype
[, ...] ] ) ] | LARGE OBJECTlarge_object_oid
| MATERIALIZED VIEWobject_name
| [ PROCEDURAL ] LANGUAGEobject_name
| PROCEDUREprocedure_name
[ ( [ [argmode
] [argname
]argtype
[, ...] ] ) ] | PUBLICATIONobject_name
| ROLEobject_name
| ROUTINEroutine_name
[ ( [ [argmode
] [argname
]argtype
[, ...] ] ) ] | SCHEMAobject_name
| SEQUENCEobject_name
| SUBSCRIPTIONobject_name
| TABLESPACEobject_name
| TYPEobject_name
| VIEWobject_name
} IS {string_literal
| NULL } whereaggregate_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.
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 tables, aggregates, domains, foreign tables, functions, procedures, routines, sequences, types, and views 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
, orVARIADIC
. If omitted, the default isIN
. Note thatSECURITY LABEL
does not actually pay any attention toOUT
arguments, since only the input arguments are needed to determine the function's identity. So it is sufficient to list theIN
,INOUT
, andVARIADIC
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
sepgsql ,
src/test/modules/dummy_seclabel