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Add a SECURITY LABEL command.

Browse Source 
This is intended as infrastructure to support integration with label-based
mandatory access control systems such as SE-Linux. Further changes (mostly
hooks) will be needed, but this is a big chunk of it.

KaiGai Kohei and Robert Haas
This commit is contained in:
Robert Haas
2010-09-27 20:55:27 -04:00
parent 2ce003973d
commit 4d355a8336
42 changed files with 1815 additions and 26 deletions
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172
doc/src/sgml/catalogs.sgml
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@ -208,6 +208,11 @@
<entry>query rewrite rules</entry>
</row>
<row>
<entry><link linkend="catalog-pg-seclabel"><structname>pg_seclabel</structname></link></entry>
<entry>security labels on database objects</entry>
</row>
<row>
<entry><link linkend="catalog-pg-shdepend"><structname>pg_shdepend</structname></link></entry>
<entry>dependencies on shared objects</entry>
@ -4229,6 +4234,77 @@
</sect1>
<sect1 id="catalog-pg-seclabel">
<title><structname>pg_seclabel</structname></title>
<indexterm zone="catalog-pg-seclabel">
<primary>pg_seclabel</primary>
</indexterm>
<para>
The catalog <structname>pg_seclabel</structname> stores security
labels on database objects. See the
<xref linkend="sql-security-label"> statement.
</para>
<table>
<title><structname>pg_seclabel</structname> Columns</title>
<tgroup cols="4">
<thead>
<row>
<entry>Name</entry>
<entry>Type</entry>
<entry>References</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><structfield>objoid</structfield></entry>
<entry><type>oid</type></entry>
<entry>any OID column</entry>
<entry>The OID of the object this security label pertains to</entry>
</row>
<row>
<entry><structfield>classoid</structfield></entry>
<entry><type>oid</type></entry>
<entry><literal><link linkend="catalog-pg-class"><structname>pg_class</structname></link>.oid</literal></entry>
<entry>The OID of the system catalog this object appears in</entry>
</row>
<row>
<entry><structfield>objsubid</structfield></entry>
<entry><type>int4</type></entry>
<entry></entry>
<entry>
For a security label on a table column, this is the column number (the
<structfield>objoid</> and <structfield>classoid</> refer to
the table itself). For all other object types, this column is
zero.
</entry>
</row>
<row>
<entry><structfield>provider</structfield></entry>
<entry><type>text</type></entry>
<entry></entry>
<entry>The label provider associated with this label.</entry>
</row>
<row>
<entry><structfield>label</structfield></entry>
<entry><type>text</type></entry>
<entry></entry>
<entry>The security label applied to this object.</entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="catalog-pg-shdepend">
<title><structname>pg_shdepend</structname></title>
@ -5883,6 +5959,11 @@
<entry>rules</entry>
</row>
<row>
<entry><link linkend="view-pg-seclabels"><structname>pg_seclabels</structname></link></entry>
<entry>security labels</entry>
</row>
<row>
<entry><link linkend="view-pg-settings"><structname>pg_settings</structname></link></entry>
<entry>parameter settings</entry>
@ -6791,6 +6872,97 @@
</sect1>
<sect1 id="view-pg-seclabels">
<title><structname>pg_seclabels</structname></title>
<indexterm zone="view-pg-seclabels">
<primary>pg_seclabels</primary>
</indexterm>
<para>
The view <structname>pg_seclabels</structname> provides information about
security labels. It as an easier-to-query version of the
<link linkend="catalog-pg-seclabel"><structname>pg_seclabel</></> catalog.
</para>
<table>
<title><structname>pg_seclabels</> Columns</title>
<tgroup cols="4">
<thead>
<row>
<entry>Name</entry>
<entry>Type</entry>
<entry>References</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><structfield>objoid</structfield></entry>
<entry><type>oid</type></entry>
<entry>any OID column</entry>
<entry>The OID of the object this security label pertains to</entry>
</row>
<row>
<entry><structfield>classoid</structfield></entry>
<entry><type>oid</type></entry>
<entry><literal><link linkend="catalog-pg-class"><structname>pg_class</structname></link>.oid</literal></entry>
<entry>The OID of the system catalog this object appears in</entry>
</row>
<row>
<entry><structfield>objsubid</structfield></entry>
<entry><type>int4</type></entry>
<entry></entry>
<entry>
For a security label on a table column, this is the column number (the
<structfield>objoid</> and <structfield>classoid</> refer to
the table itself). For all other object types, this column is
zero.
</entry>
</row>
<row>
<entry><structfield>objtype</structfield></entry>
<entry><type>text</type></entry>
<entry></entry>
<entry>
The type of object to which this label applies, as text.
</entry>
</row>
<row>
<entry><structfield>objnamespace</structfield></entry>
<entry><type>oid</type></entry>
<entry><literal><link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link>.oid</literal></entry>
<entry>
The OID of the namespace for this object, if applicable;
otherwise NULL.
</entry>
</row>
<row>
<entry><structfield>objname</structfield></entry>
<entry><type>text</type></entry>
<entry></entry>
<entry>
The name of the object to which this label applies, as text.
</entry>
</row>
<row>
<entry><structfield>provider</structfield></entry>
<entry><type>text</type></entry>
<entry><literal><link linkend="catalog-pg-seclabel"><structname>pg_seclabel</structname></link>.provider</literal></entry>
<entry>The label provider associated with this label.</entry>
</row>
<row>
<entry><structfield>label</structfield></entry>
<entry><type>text</type></entry>
<entry><literal><link linkend="catalog-pg-seclabel"><structname>pg_seclabel</structname></link>.label</literal></entry>
<entry>The security label applied to this object.</entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="view-pg-settings">
<title><structname>pg_settings</structname></title>

1
doc/src/sgml/ref/allfiles.sgml
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@ -132,6 +132,7 @@ Complete list of usable sgml source files in this directory.
<!entity rollbackPrepared system "rollback_prepared.sgml">
<!entity rollbackTo system "rollback_to.sgml">
<!entity savepoint system "savepoint.sgml">
<!entity securityLabel system "security_label.sgml">
<!entity select system "select.sgml">
<!entity selectInto system "select_into.sgml">
<!entity set system "set.sgml">

10
doc/src/sgml/ref/pg_dump.sgml
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@ -778,6 +778,16 @@ PostgreSQL documentation
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--security-label</option></term>
<listitem>
<para>
With this option, it also outputs security labels of database
objects to be dumped, if labeled.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>

9
doc/src/sgml/ref/pg_dumpall.sgml
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@ -493,6 +493,15 @@ PostgreSQL documentation
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--security-label</option></term>
<listitem>
<para>
With this option, it also outputs security labels of database
objects to be dumped, if labeled.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>

10
doc/src/sgml/ref/pg_restore.sgml
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@ -328,6 +328,16 @@
</listitem>
</varlistentry>
<varlistentry>
<term><option>--no-security-label</option></term>
<listitem>
<para>
Do not output commands to restore security labels,
even if the archive contains them.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-P <replaceable class="parameter">function-name(argtype [, ...])</replaceable></option></term>
<term><option>--function=<replaceable class="parameter">function-name(argtype [, ...])</replaceable></option></term>

194
doc/src/sgml/ref/security_label.sgml Normal file
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@ -0,0 +1,194 @@
<!--
$PostgreSQL$
PostgreSQL documentation
-->
<refentry id="SQL-SECURITY-LABEL">
<refmeta>
<refentrytitle>SECURITY LABEL</refentrytitle>
<manvolnum>7</manvolnum>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>SECURITY LABEL</refname>
<refpurpose>define or change a security label applied to an object</refpurpose>
</refnamediv>
<indexterm zone="sql-security-label">
<primary>SECURITY LABEL</primary>
</indexterm>
<refsynopsisdiv>
<synopsis>
SECURITY LABEL [ FOR <replaceable class="PARAMETER">provider</replaceable> ] ON
{
TABLE <replaceable class="PARAMETER">object_name</replaceable> |
COLUMN <replaceable class="PARAMETER">table_name</replaceable>.<replaceable class="PARAMETER">column_name</replaceable> |
AGGREGATE <replaceable class="PARAMETER">agg_name</replaceable> (<replaceable class="PARAMETER">agg_type</replaceable> [, ...] ) |
DOMAIN <replaceable class="PARAMETER">object_name</replaceable> |
FUNCTION <replaceable class="PARAMETER">function_name</replaceable> ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) |
LARGE OBJECT <replaceable class="PARAMETER">large_object_oid</replaceable> |
[ PROCEDURAL ] LANGUAGE <replaceable class="PARAMETER">object_name</replaceable> |
SCHEMA <replaceable class="PARAMETER">object_name</replaceable> |
SEQUENCE <replaceable class="PARAMETER">object_name</replaceable> |
TYPE <replaceable class="PARAMETER">object_name</replaceable> |
VIEW <replaceable class="PARAMETER">object_name</replaceable>
} IS '<replaceable class="PARAMETER">label</replaceable>'
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>SECURITY LABEL</command> 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
<function>register_label_provider</>.
</para>
<note>
<para>
<function>register_label_provider</> is not an SQL function; it can
only be called from C code loaded into the backend.
</para>
</note>
<para>
The label provider determines whether a given a 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.
<productname>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
<productname>SE-Linux</>. Such systems make all access control decisions
based on object labels, rather than traditional discretionary access control
(DAC) concepts such as users and groups.
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><replaceable class="parameter">object_name</replaceable></term>
<term><replaceable class="parameter">table_name.column_name</replaceable></term>
<term><replaceable class="parameter">agg_name</replaceable></term>
<term><replaceable class="parameter">function_name</replaceable></term>
<listitem>
<para>
The name of the object to be commented. Names of tables,
aggregates, domains, functions, sequences, types, and views can
be schema-qualified.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">provider</replaceable></term>
<listitem>
<para>
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.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">argmode</replaceable></term>
<listitem>
<para>
The mode of a function argument: <literal>IN</>, <literal>OUT</>,
<literal>INOUT</>, or <literal>VARIADIC</>.
If omitted, the default is <literal>IN</>.
Note that <command>COMMENT ON FUNCTION</command> does not actually pay
any attention to <literal>OUT</> arguments, since only the input
arguments are needed to determine the function's identity.
So it is sufficient to list the <literal>IN</>, <literal>INOUT</>,
and <literal>VARIADIC</> arguments.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">argname</replaceable></term>
<listitem>
<para>
The name of a function argument.
Note that <command>COMMENT ON FUNCTION</command> does not actually pay
any attention to argument names, since only the argument data
types are needed to determine the function's identity.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">argtype</replaceable></term>
<listitem>
<para>
The data type(s) of the function's arguments (optionally
schema-qualified), if any.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">large_object_oid</replaceable></term>
<listitem>
<para>
The OID of the large object.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>PROCEDURAL</literal></term>
<listitem>
<para>
This is a noise word.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">label</replaceable></term>
<listitem>
<para>
The new security label, written as a string literal; or <literal>NULL</>
to drop the security label.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
The following example shows how the security label of a table might
be changed.
<programlisting>
SECURITY LABEL FOR selinux ON TABLE mytable IS 'system_u:object_r:sepgsql_table_t:s0';
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
There is no <command>SECURITY LABEL</command> command in the SQL standard.
</para>
</refsect1>
</refentry>

1
doc/src/sgml/reference.sgml
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@ -160,6 +160,7 @@
&rollbackPrepared;
&rollbackTo;
&savepoint;
&securityLabel;
&select;
&selectInto;
&set;