Re: postgres_fdw super user checks

On Mon, Oct 17, 2016 at 2:18 AM, Michael Paquier
<michael(dot)paquier(at)gmail(dot)com> wrote:
> On Mon, Oct 17, 2016 at 3:33 AM, Jeff Janes <jeff(dot)janes(at)gmail(dot)com> wrote:
>> postgres_fdw has some checks to enforce that non-superusers must connect to
>> the foreign server with a password-based method. The reason for this is to
>> prevent the authentication to the foreign server from happening on the basis
>> of the OS user who is running the non-foreign server.
>>
>> But I think these super user checks should be run against the userid of the
>> USER MAPPING being used for the connection, not the userid of currently
>> logged on user.
>
> So, if the user mapping user is a superuser locally, this would allow
> any lambda user of the local server to attempt a connection to the
> remote server. It looks dangerous rather dangerous to me to authorize
> that, even if the current behavior is a bit inconsistent I agree.

I don't know what "any lambda user" means. Did you mean to write "any
random user"?

--
Robert Haas
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