Grant from schema A of Schema B tables to schema C - sql

Question

I have an application schema U32_C5 and another schema MIG_SRC which has some tables and then we have a ROLE RO_ROLE on which we have some grants of tables from Schema U32_C5.
The RO_ROLE is assigned to another Schema MRGO_RO which is Read Only.
Here I need to grant select on tables from MIG_SRC to MRGO_RO catch here is that the process which and from where I can include these grants is run from application schema U32_C5 in production so when I tried to to something like below it says table or view does not exists (which seems to be obvious)
execute Grant from U32_C5
grant select on MIG_SRC.MOBILE_CELLPHONE_PAIRINGS to MRGO_RO;
Another way which I think of is creating DB link on MRGO_RO for MIG_SRC Schema but it enables read/write operation as well on MIG_SRC tables which is not allowed on production.
DB Links is present on U32_C5 Schema for MIG_SRC Schema
So looking for a way to accomplish above task without creating DB Link any suggestion is welcome.
Sample Script of requirement what I want to achieve Please Remember I cannot and do not want Login to MIG_SRC and only way I am looking for is to do it by using U32_C5 and without DBA HELP
A RO ROLE Created by DBA's
Create role RO_ROLE;
/* Create application schema, table inside it and grant select on it to RO_ROLE*/
CREATE USER U32_C5 IDENTIFIED BY U32_C5 DEFAULT TABLESPACE;
GRANT ALTER SESSION TO U32_C5;
GRANT CREATE SESSION TO U32_C5;
GRANT CREATE database link TO U32_C5;
GRANT CREATE table TO U32_C5;
create table U32_C5_test_tab (id number);
grant select on U32_c5.U32_C5_Test_tab to RO_ROLE;
/* Create Read Only schema, grant RO_ROLE to it */
CREATE USER mrgo_ro IDENTIFIED BY mrgo_ro DEFAULT TABLESPACE;
GRANT ALTER SESSION TO mrgo_ro;
GRANT CREATE SESSION TO mrgo_ro;
grant ro_role to mrgo_ro;
/* Create SRC schema, table inside it */
CREATE USER MIG_SRC IDENTIFIED BY MIG_SRC DEFAULT TABLESPACE;
GRANT ALTER SESSION TO MIG_SRC;
GRANT CREATE SESSION TO MIG_SRC;
GRANT CREATE database link TO MIG_SRC;
GRANT CREATE table TO MIG_SRC;
create table mig_src_test_tab (id number);
/* login to Apllication Schema U32_C5 */
sqlplus U32_C5/U32_C5#SID
grant select on mig_src.mig_src_test_tab to mrgo_ro; -- for me it gives error here at this step table or does not exist
/* login to Read Only Schema mrgo_ro */
sqlplus mrgo_ro/mrgo_ro#SID
select * from mig_src.mig_src_test_tab;
or
select * from mig_src_test_tab;

Answer 1

If I understood you correctly, then WITH GRANT OPTION is what you're missing.
Once someone (A) grants privileges on their own objects to someone else (B), and that (B) has to "forward" those privileges to (C), then it is the WITH GRANT OPTION that helps.
Documentation says:
Specify WITH GRANT OPTION to enable the grantee to grant the object privileges to other users and roles.
Restriction on Granting WITH GRANT OPTION You can specify WITH GRANT OPTION only when granting to a user or to PUBLIC, not when granting to a role.
It means that you should grant privileges directly, not via role. That fact doesn't have to be a drawback because of named PL/SQL procedures, where privileges acquired via roles won't work anyway, so you might end up in direct grants anyway.
Other option - which you might consider - is related to what you said:
when I tried to to something like below it says table or view does not exists
If you created a synonym for those tables, then you wouldn't get such an error.
Database link isn't an option, as you said - by using it, you have full access (as you have to know username/password to create the DB link, and that isn't really read only access).