Re: Pasword expiration warning - Mailing list pgsql-hackers

Le 29/01/2026 à 18:53, Nathan Bossart a écrit :
> Sorry, I haven't been following the discussion, but I took a brief look at
> the latest patch in the thread.
>
> +        Controls how much time (in seconds) before a role's password expiration
> +        a <literal>WARNING</literal> message is sent to the client upon successful
> +        connection. It requires that a <command>VALID UNTIL</command> date is set
> +        for the role. A value of <literal>0d</literal> disable this behavior. The
> +        default value is <literal>7d</literal> and the maximum value <literal>30d</literal>.
>
> I'm not sure we should subject folks to these warnings by default, and I
> don't see a reason to restrict the maximum value to 30 days.  IMHO we
> should have this disabled by default and the maximum value should be
> INT_MAX.


This was my first though but I agree with Tom comment "Off-by-default is 
pretty much guaranteed to not help most people.". I will use INT_MAX.


> +        if (password_expire_warning > 0 && vuntil < PG_INT64_MAX)
> +        {
> +            TimestampTz result = (vuntil - now) / USECS_PER_SEC;    /* in seconds */
> +
> +            if (result <= (TimestampTz) password_expire_warning)
> +            {
> +                MyClientConnectionInfo.warning_message =
> +                    psprintf(_("your password will expire in %d day(s)"),
> +                             (int) (result / SECS_PER_DAY));
> +            }
> +        }
>
> nitpick: I suspect we could simplify this code a bit, but I haven't tried.
>
> Also, IMO we should be more precise about the expiration time.  There is a
> reasonable difference between a password expiring in 1 second as opposed to
> 23 hours, 59 minutes, 59 seconds, but in both cases this message would say
> "0 days".  You might be able to borrow from psql/common.c's PrintTiming()
> function to add more detail here.


Ok, there's now more vote for being more precise about the expiration 
time, I will add it.


> +    /*
> +     * Emit a warning message to the client when set, for example
> +     * to warn the user that the password will expire.
> +     */
> +    if (MyClientConnectionInfo.warning_message)
> +        ereport(WARNING, (errmsg("%s", MyClientConnectionInfo.warning_message)));
>
> Having a variable for warning messages could come in handy later.  For
> example, we might add a warning about using MD5 passwords at some point.
> In my draft patch for this [0], I put the warning after closing the
> transaction, whereas this patch puts it just before.  I'm not sure I had a
> principled reason for doing so, but it's an interesting difference between
> the two patches.
>
> [0] https://postgr.es/m/attachment/177167/v2-0002-WIP-add-warning-upon-authentication-with-MD5-pass.patch

Understood, I will rewrite the patch to use a int variable.


Thanks.

-- 
Gilles Darold
http://www.darold.net/