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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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>SECURITY LABEL</TITLE
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><H1
><A
NAME="SQL-SECURITY-LABEL"
></A
>SECURITY LABEL</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN74368"
></A
><H2
>Name</H2
>SECURITY LABEL&nbsp;--&nbsp;define or change a security label applied to an object</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN74373"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>SECURITY LABEL [ FOR <TT
CLASS="REPLACEABLE"
><I
>provider</I
></TT
> ] ON
{
  TABLE <TT
CLASS="REPLACEABLE"
><I
>object_name</I
></TT
> |
  COLUMN <TT
CLASS="REPLACEABLE"
><I
>table_name</I
></TT
>.<TT
CLASS="REPLACEABLE"
><I
>column_name</I
></TT
> |
  AGGREGATE <TT
CLASS="REPLACEABLE"
><I
>agg_name</I
></TT
> (<TT
CLASS="REPLACEABLE"
><I
>agg_type</I
></TT
> [, ...] ) |
  DOMAIN <TT
CLASS="REPLACEABLE"
><I
>object_name</I
></TT
> |
  FOREIGN TABLE <TT
CLASS="REPLACEABLE"
><I
>object_name</I
></TT
>
  FUNCTION <TT
CLASS="REPLACEABLE"
><I
>function_name</I
></TT
> ( [ [ <TT
CLASS="REPLACEABLE"
><I
>argmode</I
></TT
> ] [ <TT
CLASS="REPLACEABLE"
><I
>argname</I
></TT
> ] <TT
CLASS="REPLACEABLE"
><I
>argtype</I
></TT
> [, ...] ] ) |
  LARGE OBJECT <TT
CLASS="REPLACEABLE"
><I
>large_object_oid</I
></TT
> |
  [ PROCEDURAL ] LANGUAGE <TT
CLASS="REPLACEABLE"
><I
>object_name</I
></TT
> |
  SCHEMA <TT
CLASS="REPLACEABLE"
><I
>object_name</I
></TT
> |
  SEQUENCE <TT
CLASS="REPLACEABLE"
><I
>object_name</I
></TT
> |
  TYPE <TT
CLASS="REPLACEABLE"
><I
>object_name</I
></TT
> |
  VIEW <TT
CLASS="REPLACEABLE"
><I
>object_name</I
></TT
>
} IS '<TT
CLASS="REPLACEABLE"
><I
>label</I
></TT
>'</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74394"
></A
><H2
>Description</H2
><P
>   <TT
CLASS="COMMAND"
>SECURITY LABEL</TT
> 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
   <CODE
CLASS="FUNCTION"
>register_label_provider</CODE
>.
  </P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>      <CODE
CLASS="FUNCTION"
>register_label_provider</CODE
> is not an SQL function; it can
      only be called from C code loaded into the backend.
    </P
></BLOCKQUOTE
></DIV
><P
>   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.
   <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 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
   <SPAN
CLASS="PRODUCTNAME"
>SE-Linux</SPAN
>.  Such systems make all access control decisions
   based on object labels, rather than traditional discretionary access control
   (DAC) concepts such as users and groups.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74405"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>object_name</I
></TT
><BR><TT
CLASS="REPLACEABLE"
><I
>table_name.column_name</I
></TT
><BR><TT
CLASS="REPLACEABLE"
><I
>agg_name</I
></TT
><BR><TT
CLASS="REPLACEABLE"
><I
>function_name</I
></TT
></DT
><DD
><P
>      The name of the object to be labeled.  Names of tables,
      aggregates, domains, foreign tables, functions, sequences, types, and
      views can be schema-qualified.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>provider</I
></TT
></DT
><DD
><P
>      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.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>arg_type</I
></TT
></DT
><DD
><P
>      An input data type on which the aggregate function operates.
      To reference a zero-argument aggregate function, write <TT
CLASS="LITERAL"
>*</TT
>
      in place of the list of input data types.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>argmode</I
></TT
></DT
><DD
><P
>      The mode of a function argument: <TT
CLASS="LITERAL"
>IN</TT
>, <TT
CLASS="LITERAL"
>OUT</TT
>,
      <TT
CLASS="LITERAL"
>INOUT</TT
>, or <TT
CLASS="LITERAL"
>VARIADIC</TT
>.
      If omitted, the default is <TT
CLASS="LITERAL"
>IN</TT
>.
      Note that <TT
CLASS="COMMAND"
>SECURITY LABEL ON FUNCTION</TT
> does not actually
      pay any attention to <TT
CLASS="LITERAL"
>OUT</TT
> arguments, since only the input
      arguments are needed to determine the function's identity.
      So it is sufficient to list the <TT
CLASS="LITERAL"
>IN</TT
>, <TT
CLASS="LITERAL"
>INOUT</TT
>,
      and <TT
CLASS="LITERAL"
>VARIADIC</TT
> arguments.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>argname</I
></TT
></DT
><DD
><P
>      The name of a function argument.
      Note that <TT
CLASS="COMMAND"
>SECURITY LABEL ON FUNCTION</TT
> does not actually
      pay any attention to argument names, since only the argument data
      types are needed to determine the function's identity.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>argtype</I
></TT
></DT
><DD
><P
>      The data type(s) of the function's arguments (optionally
      schema-qualified), if any.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>large_object_oid</I
></TT
></DT
><DD
><P
>      The OID of the large object.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>PROCEDURAL</TT
></DT
><DD
><P
>       This is a noise word.
      </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>label</I
></TT
></DT
><DD
><P
>      The new security label, written as a string literal; or <TT
CLASS="LITERAL"
>NULL</TT
>
      to drop the security label.
     </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74472"
></A
><H2
>Examples</H2
><P
>   The following example shows how the security label of a table might
   be changed.

</P><PRE
CLASS="PROGRAMLISTING"
>SECURITY LABEL FOR selinux ON TABLE mytable IS 'system_u:object_r:sepgsql_table_t:s0';</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74476"
></A
><H2
>Compatibility</H2
><P
>   There is no <TT
CLASS="COMMAND"
>SECURITY LABEL</TT
> command in the SQL standard.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74480"
></A
><H2
>See Also</H2
><A
HREF="sepgsql.html"
>sepgsql</A
>, <A
HREF="dummy-seclabel.html"
>dummy_seclabel</A
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