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sepgsql: Documentation improvements.

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Fixes by me, per griping by Thom Brown.
This commit is contained in:
Robert Haas 2013-03-28 15:55:44 -04:00
parent 0f05840bf4
commit 2a3db8cec2
1 changed files with 68 additions and 52 deletions
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doc/src/sgml/sepgsql.sgml
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@ -422,69 +422,85 @@ UPDATE t1 SET x = 2, y = md5sum(y) WHERE z = 100;
addition or deletion of name entries within a particular schema.
</para>
<para>
When a <literal>CREATE</> command is executed, <literal>create</> will
be checked on the object being constructed for each object types.
A default security label will be assigned to the new database object,
and the <literal>create</> permission will be checked on the pair
of security label of the client and the new object itself.
We consider <xref linkend="sql-createtable"> to construct a table and
underlying columns at the same time, so it requires the users to have
permission to create both the table and its columns.
</para>
<para>
A few additional checks are applied depending on object types.
On <xref linkend="sql-createdatabase">, <literal>getattr</> permission
will be checked on the source or template database of the new database,
not only <literal>create</> on the new database.
On creation of objects within a particular schema (tables, views,
sequences and procedures), <literal>add_name</> will be also checked
on the schema, not only <literal>create</> on the new object itself.
On <xref linkend="sql-createfunction">, <literal>install</> permission
will be checked if <literal>leakproof</> attribute was given, not only
<literal>create</> on the new function. This permission will be also
checked when user tries to turn on <literal>leakproof</> attribute
using <xref linkend="sql-alterfunction"> command, with
<literal>setattr</> permission on the function being altered.
Creating a new database object requires <literal>create</> permission.
<productname>SELinux</> will grant or deny this permission based on the
client's security label and the proposed security label for the new
object. In some cases, additional privileges are required:
</para>
<itemizedlist>
<listitem>
<para>
<xref linkend="sql-createdatabase"> additionally requires
<literal>getattr</> permission for the source or template database.
</para>
</listitem>
<listitem>
<para>
Creating a schema object additionally requires <literal>add_name</>
permission on the parent schema.
</para>
</listitem>
<listitem>
<para>
Creating a table additionally requires permission to create each
individual table column, just as if each table column were a
separate top-level object.
</para>
</listitem>
<listitem>
<para>
Creating a function marked as <literal>LEAKPROOF</> additionally
requires <literal>install</> permission. (This permission is also
checked when <literal>LEAKPROOF</> is set for an existing function.)
</para>
</listitem>
</itemizedlist>
<para>
When <literal>DROP</> command is executed, <literal>drop</> will be
checked on the object being removed for each object types. Permissions
will be also checked for objects dropped indirectly via <literal>CASCADE</>.
Deletion of objects contained within a particular schema (tables, views,
sequences and procedures) additionally requires
<literal>remove_name</> on the schema.
checked on the object being removed. Permissions will be also checked for
objects dropped indirectly via <literal>CASCADE</>. Deletion of objects
contained within a particular schema (tables, views, sequences and
procedures) additionally requires <literal>remove_name</> on the schema.
</para>
<para>
When <literal>ALTER</> command is executed, <literal>setattr</> will be
checked on the object being modified for each object types.
In addition, <literal>remove_name</> and <literal>add_name</>
will be checked on the old and new schemas, respectively, when an
object is moved to a new schema.
For certain object types, additional checks are performed.
checked on the object being modified for each object types, except for
subsidiary objects such as the indexes or triggers of a table, where
permissions are instead checked on the parent object. In some cases,
additional permissions are required:
</para>
<para>
When objects that are subsidiary of other objects (such as a table's
indexes or triggers) are created, dropped or altered,
<literal>setattr</> permission will be checked on the main object,
instead of the subsidiary object itself.
</para>
<itemizedlist>
<listitem>
<para>
Moving an object to a new schema additionally requires
<literal>remove_name</> permission on the old schema and
<literal>add_name</> permission on the new one.
</para>
</listitem>
<listitem>
<para>
Setting the <literal>LEAKPROOF</> attribute on a function requires
<literal>install</> permission.
</para>
</listitem>
<listitem>
<para>
Using <xref linkend="sql-security-label"> on an object additionally
requires <literal>relabelfrom</> permission for the object in
conjunction with its old security label and <literal>relabelto</>
permission for the object in conjunction with its new security label.
(In cases where multiple label providers are installed and the user
tries to set a security label, but it is not managed by
<productname>SELinux</>, only <literal>setattr</> should be checked here.
This is currently not done due to implementation restrictions.)
</para>
</listitem>
</itemizedlist>
<para>
When <xref linkend="sql-security-label"> is executed, <literal>setattr</>
and <literal>relabelfrom</> will be checked on the object being relabeled
with its old security label, then <literal>relabelto</> with the supplied
new security label.
</para>
<para>
In the case where multiple label providers are installed and the user tries
to set a security label, but it is not managed by <productname>SELinux</>,
only <literal>setattr</> should be checked here.
This is currently not done due to implementation restrictions.
</para>
</sect3>
<sect3>