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# -*- perl -*-
=head1 NAME
check_badmailfrom - checks the badmailfrom config, with per-line reasons
=head1 DESCRIPTION
Reads the "badmailfrom" configuration like qmail-smtpd does. From the
qmail-smtpd docs:
"Unacceptable envelope sender addresses. qmail-smtpd will reject every
recipient address for a message if the envelope sender address is
listed in badmailfrom. A line in badmailfrom may be of the form
@host, meaning every address at host."
You may optionally include a message after the sender address (leave a space),
which is used when rejecting the sender.
=head1 NOTES
According to the SMTP protocol, we can't reject until after the RCPT
stage, so store it until later.
=cut
# TODO: add the ability to provide a custom default rejection reason
sub hook_mail {
my ($self, $transaction, $sender, %param) = @_;
my @badmailfrom = $self->qp->config("badmailfrom")
or return (DECLINED);
return (DECLINED) unless ($sender->format ne "<>"
and $sender->host && $sender->user);
my $host = lc $sender->host;
my $from = lc($sender->user) . '@' . $host;
for my $config (@badmailfrom) {
my ($bad, $reason) = $config =~ /^\s*(\S+)(?:\s*(.*))?$/;
$reason = "sorry, your envelope sender is in my badmailfrom list" unless $reason;
next unless $bad;
$bad = lc $bad;
$self->log(LOGWARN, "Bad badmailfrom config: No \@ sign in $bad") and next unless $bad =~ m/\@/;
$transaction->notes('badmailfrom', $reason)
if ($bad eq $from) || (substr($bad,0,1) eq '@' && $bad eq "\@$host");
}
return (DECLINED);
}
sub hook_rcpt {
my ($self, $transaction, $rcpt, %param) = @_;
my $note = $transaction->notes('badmailfrom');
if ($note) {
$self->log(LOGINFO, $note);
return (DENY, $note);
}
return (DECLINED);
}
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