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Revise the permission checking on user mapping DDL commands.

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CREATE/ALTER/DROP USER MAPPING are now allowed either by the server owner or
by a user with USAGE privileges for his own user name.  This is more or less
what the SQL standard wants anyway (plus "implementation-defined")

Hide information_schema.user_mapping_options.option_value, unless the current
user is the one associated with the user mapping, or is the server owner and
the mapping is for PUBLIC, or is a superuser.  This is to protect passwords.

Also, fix a bug in information_schema._pg_foreign_servers, which hid servers
using wrappers where the current user did not have privileges on the wrapper.
The correct behavior is to hide servers where the current user has no
privileges on the server.
This commit is contained in:
Peter Eisentraut
2009-01-20 09:10:20 +00:00
parent fe62698218
commit 93a6be63a5
8 changed files with 89 additions and 46 deletions
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11
doc/src/sgml/ref/alter_user_mapping.sgml
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@@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_user_mapping.sgml,v 1.1 2008/12/19 16:25:16 petere Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_user_mapping.sgml,v 1.2 2009/01/20 09:10:20 petere Exp $
PostgreSQL documentation
-->
@@ -31,10 +31,15 @@ ALTER USER MAPPING FOR { <replaceable class="parameter">username</replaceable> |
<para>
<command>ALTER USER MAPPING</command> changes the definition of a
user mapping. Only the owner of the server can change the user
mappings of that server.
user mapping.
</para>
<para>
The owner of a foreign server can alter user mappings for that
server for any user. Also, a user can alter a user mapping for
his own user name if <literal>USAGE</> privilege on the server has
been granted to the user.
</para>
</refsect1>
<refsect1>