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execute immediate causes insufficient privileges over a database link

Oracle Database Tips by Donald BurlesonMay 8, 2013

Question:  I have a stored procedure that runs fine standalone, but fails with insufficient privileges when invoked via a database link from another database.   The privileges error arises from the execute immediate statements.  How do I get the stored procedure to run when invoked from a remote database link user?

Answer:  Oracle provides with AUTHID clause for stored procedures with a value f either DEFINER or CURRENT_USER :

CREATE OR REPLACE PROCEDURE
link_proc
AUTHID DEFINER IS
BEGIN

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.

Oracle needs to know explicitly what kind of privileges to use when executing the stored procedure. The way to let Oracle know that is to use AUTHID keyword in the CREATE OR REPLACE syntax.

If you want the same level of privileges as the "grant execute privilege"(i.e. the creator of the procedure), you use AUTHID DEFINER. Conversely, if you want Oracle to use the privileges of the user currently running the stored procedure, you want to use AUTHID CURRENT_USER.

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.

 

 
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