On Tue, Oct 24, 2023 at 12:52:37PM +0200, Paul Menzel via Postfix-users wrote:

> Jozsef Kadlecsik submitted a patch, and it was accepted and is going to be
> available in the 3.9 release [1].
> 
> > 20231006
> > 
> >     Cleanup: attempt to log the SASL username after authentication
> >     failure. This appends ", sasl_username=xxx" to SASL authentication
> >     failure logging. Based on code by Jozsef Kadlecsik. Files:
> >     xsasl/xsasl_server.c, xsasl/xsasl_cyrus_server.c,
> >     smtpd/smtpd_sasl_glue.c.

>From my logs:

    postfix/smtps/smtpd[10521]: warning: unknown[52.253.87.181]:
        SASL PLAIN authentication failed: , sasl_username=test

The ": ," is a an empty SASL library "reply":

    src/smtpd/smtpd_sasl_glue.c:    msg_warn("%s: SASL %s authentication 
failed: %s, sasl_username=%s",
    src/smtpd/smtpd_sasl_glue.c-             state->namaddr, sasl_method,
    src/smtpd/smtpd_sasl_glue.c-             STR(state->sasl_reply),
    src/smtpd/smtpd_sasl_glue.c-             sasl_username ? sasl_username : 
"(unavailable)");

-- 
    Viktor.
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