Re: User-Id Tracking when Portal was started

On Mon, Jul 2, 2012 at 10:55 AM, Kohei KaiGai <kaigai@kaigai.gr.jp> wrote:
> The attached patch is delivered from the discussion around row-level
> access control feature. A problem Florian pointed out is refcursor
> declared in security definer function. Even though all the permission
> checks are applied based on privilege of the owner of security-definer
> function in case when it tries to define a cursor bound to a particular
> query, it shall be executed under the credential of executor.
> In the result, "current_user" or "has_table_privilege()" will return
> unexpected result, even if it would be used in as a part of security
> policy for each row.

Why not just save and restore the user ID and security context
unconditionally, instead of doing this kind of dance?

+               if (portal->userId != GetUserId())
+                       SetUserIdAndSecContext(portal->userId, portal->secCo
+               else
+                       saveUserId = InvalidOid;

-- 
Robert Haas
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