Re: Temporarily suspend a user account?

On 6 Feb 2015 4:21 PM, Jerry Sievers wrote:
> David G Johnston <david(dot)g(dot)johnston(at)gmail(dot)com> writes:
>
>> On Fri, Feb 6, 2015 at 2:29 PM, Felipe Gasper [via PostgreSQL] <[hidden email]> wrote:
>>
>> On 6 Feb 2015 3:15 PM, David G Johnston wrote:
>>
>> > Felipe Gasper wrote
>> >> Hello,
>> >>
>> >> Is there a way to temporarily suspend a user account?
>> >>
>> >> I would prefer not to revoke login privileges since that will break
>> >> things that mine pg_users and pg_shadow.
>> >>
>> >> I also am trying to find something that is completely reversible, so
>> >> something like setting connection limit to 0, which would lose a
>> >> potentially customized connection limit, doesn’t work.
>> >>
>> >> We do this in MySQL by reversing the password hash then running FLUSH
>> >> PRIVILEGES; however, that doesn’t seem to work in PostgreSQL/pg_authid
>> >> as some sort of cache prevents this from taking effect.
>> >>
>> >> Has anyone else solved this issue? Thank you!
>> >
>> > Personally untested:
>> >
>> > ALTER ROLE role_name VALID UNTIL 'timestamp' --i.e., set that to sometime in
>> > the past
>> >
>>
>> This doesn’t work, either, because it will clobber any custom expiration
>> time for the role …
>>
>> -FGÂ
>>
>> ​Since everything about a role can be customized, and there is no simple "enabled" boolean, you need to take a known value, cache it somewhere, make your change, then
>> restore the cached value; or just edit pg_hba.conf and add reject entries for the role in question.
>
> Here we go...
>
> disable: update pg_authid set rolpassword = rolpassword || '.disabled' where rolname = 'foo';
>
> enable: update pg_authid set rolpassword = rtrim(rolpassword, 'disabled') where rolname = 'foo';
>

This does appear to work. It didn’t work earlier when I mangled the
format such that it no longer began with “md5”, though.

Weird.

Anyway, thank you! :)

-FG