Hello, ** Wietse Venema [2019-03-29 10:06:14 -0400]: > Vladimir Lomov: >> Hello, >> >> I faced with strange problem with my postfix configuration. I use the >> postfix as SMTP client to send emails from my host. Recently I >> changed the password on external email-server, updated file that >> stores passwords and now I see SASL authentication failures in log. I >> wonder is the limitation on password part in the file pointed by >> smtp_sasl_password_maps? >> >> This is password part of my postfix configuration: >> >> smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd >> >> where sasl_passwd has following format: >> >> [email protected] account:PASSWORD >> >> The only restriction on PASSWORD that email-server puts is to avoid ' >> and ~ symbols, right now PASSWORD has any except these symbols, for >> example it has symbols: ;:". > > What is the output from: > > postmap -q [email protected] | od -cb
It outputs expected string (actually I had to use
# postmap -q [email protected] /etc/postfix/sasl_passwd | ob -cb
> Does it show anything unexpected, or does it not show anything
> that you would expect to be in the output?
>
>> I read the documentation but didn't find any restrictions on
>> PASSWORD part. Do I missed something?
>
> When you create hash:/etc/postfix/sasl_passwd, the postmap command
> will
> - strip leading whitespace before 'account:password'
> - strip and trailing whitespace after 'account:password'
> - store text as null-terminated strings.
>
> Therefore, the postmap command will not store leading whitespace in the
> 'account'
> portion, will not store trailing whitespace in the 'password' portion, and
> will
> not store text that follows a null byte.
>
> The password lookup code splits the 'account:password' lookup result
> as follows:
>
> passwd = split_at(session->sasl_username, ':');
>
> Where session->sasl_username initially contains the entire lookup result.
> The split_at() call consumes exactly one ':' character.
>
> Therefore, there must be no ':' in the 'account' portion of the
> sasl_passwd lookup result. Otherwise, split_at() does not introduce
> any additional syntax restrictions on sasl_passwd syntax beyond
> those already introduced by the postmap command.
As I expected.
> Wietse
Thank you. It turned out the problem was with MAIL server provider.
---
WBR, Vladimir Lomov
--
Every love's the love before
In a duller dress.
-- Dorothy Parker, "Summary"
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