84 lines
2.2 KiB
Perl
84 lines
2.2 KiB
Perl
#!perl -w
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=head1 NAME
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check_badmailfromto - checks the badmailfromto config
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=head1 DESCRIPTION
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Much like the similar check_badmailfrom, this plugin references both the
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FROM: and TO: lines, and if they both are present in the badmailfromto
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config file (a tab delimited list of FROM/TO pairs), then the message is
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blocked as if the recipient (TO) didn't exist. This is specifically designed
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to not give the impression that the sender is blocked (good for cases of
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harassment).
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Based heavily on check_badmailfrom.
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=cut
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use strict;
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use Qpsmtpd::Constants;
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sub hook_mail {
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my ($self, $transaction, $sender, %param) = @_;
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my @badmailfromto = $self->qp->config("badmailfromto");
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return DECLINED if $self->is_sender_immune( $sender, \@badmailfromto );
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my $host = lc $sender->host;
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my $from = lc($sender->user) . '@' . $host;
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for my $bad (@badmailfromto) {
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$bad =~ s/^\s*(\S+).*/$1/;
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next unless $bad;
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$bad = lc $bad;
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if ( $bad !~ m/\@/ ) {
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$self->log(LOGWARN, 'badmailfromto: bad config, no @ sign in '. $bad);
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next;
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};
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if ( $bad eq $from || (substr($bad,0,1) eq '@' && $bad eq "\@$host") ) {
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$transaction->notes('badmailfromto', $bad);
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};
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}
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return (DECLINED);
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}
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sub hook_rcpt {
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my ($self, $transaction, $rcpt, %param) = @_;
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my $recipient = lc($rcpt->user) . '@' . lc($rcpt->host);
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my $sender = $transaction->notes('badmailfromto') or do {
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$self->log(LOGDEBUG, "pass: sender not listed");
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return (DECLINED);
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};
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foreach ( $self->qp->config("badmailfromto") ) {
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my ($from, $to) = m/^\s*(\S+)\t(\S+).*/;
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return (DENY, "mail to $recipient not accepted here")
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if lc($from) eq $sender && lc($to) eq $recipient;
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}
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$self->log(LOGDEBUG, "pass: recipient not listed");
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return (DECLINED);
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}
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sub is_sender_immune {
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my ($self, $sender, $badmf ) = @_;
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if ( ! scalar @$badmf ) {
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$self->log(LOGDEBUG, 'skip: empty list');
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return 1;
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};
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if ( ! $sender || $sender->format eq '<>' ) {
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$self->log(LOGDEBUG, 'skip: null sender');
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return 1;
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};
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if ( ! $sender->host || ! $sender->user ) {
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$self->log(LOGDEBUG, 'skip: missing user or host');
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return 1;
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};
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return;
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};
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