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| PROFILEobject_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_signatureis: * | [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. Postgres Pro 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_nametable_name.column_nameaggregate_namefunction_nameprocedure_nameroutine_nameThe name of the object to be labeled. Names of objects that reside in schemas (tables, functions, etc.) can be schema-qualified.
providerThe 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.
argmodeThe mode of a function, procedure, or aggregate argument:
IN,OUT,INOUT, orVARIADIC. If omitted, the default isIN. Note thatSECURITY LABELdoes not actually pay any attention toOUTarguments, since only the input arguments are needed to determine the function's identity. So it is sufficient to list theIN,INOUT, andVARIADICarguments.argnameThe name of a function, procedure, or aggregate argument. Note that
SECURITY LABELdoes not actually pay any attention to argument names, since only the argument data types are needed to determine the function's identity.argtypeThe data type of a function, procedure, or aggregate argument.
large_object_oidThe OID of the large object.
PROCEDURALThis is a noise word.
string_literalThe new setting of the security label, written as a string literal.
NULLWrite
NULLto 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.