Re: SET ROLE and search_path

On 5/20/20 10:36 AM, Patrick FICHE wrote:
>
> Hi,
>
> I’m trying to implement a PostgreSQL multi-tenant database that will
> be accessed by a Web Application.
>
> The users that will login will belong to different companies and a
> schema was created in the database for each company.
>
> However, I would like the Web Application to connect with a single
> Postgres login.
>
> Let’s say that I have 2 companies : comp1 and comp2 with their
> respective schema (comp1 / comp2).
>
> Then, the web application connects with web_app login which has been
> granted comp1 and comp2 roles….
>
> Depending on the user connecting to the application, I would like to
> use SET ROLE comp1 / SET ROLE comp2 in order to get access to the
> relevant data only.
>
> However, it seems that SET ROLE does not change the search_path (which
> is different for comp1 and comp2).
>
> Is there any way to change the search_path in an easy way (in a
> procedure) after SET ROLE has been executed.
>
> Am I missing anything with SET ROLE.
>
> When search_path contains “$user”, does it refer to session_user or
> current_user ?
>
> Thanks for any advice
>
> Patrick
>
Does your role definition assign a search_path?

create role comp1;
alter role comp1 set search_path=comp1,base,public;

Every re-use of the postgres connection must start by resetting the
search_path.  I find it easier to log in as comp1.  Some jiggery-pokery
involved in passwords but no one in company #1 needs to know the user
name let alone password.