Magnus Hagander <magnus@hagander.net> writes:
> When debugging strange and complex pg_hba lines, it can often be quite
> useful to know which line is matching a particular connection that
> failed for some reason. Because more often than not, it's actually not
> using the line in pg_hba.conf that's expected.
> The easiest way to do this is to emit an errdetail for the login
> failure, per this patch.
> Question is - is that leaking information to the client that we
> shouldn't be leaking?
Yes.
> And if it is, what would be the preferred way to deal with it?
Report to the postmaster log only. errdetail_log should do.
BTW, are you sure that auth_failed is only called in cases where
an hba line has already been identified? Even if true today,
it seems fairly risky to assume that.
regards, tom lane