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authid & definer rights tips

Oracle Database Tips by Donald BurlesonJanuary 5, 2013

Question What is the purpose of the authid and definer rights clauses?  Are definer rights the same as the rights when you grant execute on a procedure of function?

Answer.  The authid definer rights is the opposite of the authid current_user clause.  Essentially the same as the "grant execute:" clause" the authid definer rights allows the specified users' grants to be used for privileges within Oracle.

The use of definer rights are available in stored procedure, functions and type definitions.  Here we definer a procedure with definer rights.  Note that definer is the default argument when using the authid clause:

create or replace procedure
   myproc
   AUTHID DEFINER
as . . . .

The above definer rights clause would be equivalent to this grant execute statement:

grant execute on myproc to public;

In this example, we set the type to have definer rights:

CREATE TYPE address_t
   AUTHID DEFINER
AS OBJECT (
   address_line1     varchar2(80),
   street_name       varchar2(30),
   street_number     number,
   city              varchar2(30),
   state_or_province varchar2(2),
   country_code varchar2(20));

WARNING: Writing PL/SQL code with the default authid definer, can facilitate SQL injection attacks, because an intruder would get privileges that they would not get if they used authid current_user.

Below is a a query that shows all procedures that have authid = 'DEFINER' (definer rights) or authid = 'CURRENT_USER' (invoker rights).

select
   object_name,
   procedure_name,
   authid
from 
   dba_procedures; 

 

 
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