129 lines
3.2 KiB
Perl
129 lines
3.2 KiB
Perl
#!perl -w
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=head1 SYNOPSIS
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deny connections to recipients in the I<badrcptto> file
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like badmailfrom, but for recipient address rather than sender
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=head1 CONFIG
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Recipients are matched against entries in I<config/badrcptto>. Entries can be
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a complete email address, a host entry that starts with an @ symbol, or a
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regular expression. For regexp pattern matches, see PATTERNS.
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=head1 PATTERNS
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This allows special patterns to be denied (e.g. percent hack, bangs,
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double ats).
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Patterns are stored in the format pattern\sresponse, where pattern
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is a Perl pattern expression. Don't forget to anchor the pattern if
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you want to restrict it from matching anywhere in the string.
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qpsmtpd already ensures that the address contains an @, with something
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to the left and right of the @.
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=head1 AUTHOR
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2002 - original badrcptto plugin - apparently Jim Winstead
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https://github.com/smtpd/qpsmtpd/commits/master/plugins/check_badrcptto
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2005 - pattern feature, (c) Gordon Rowell <gordonr@gormand.com.au>
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2012 - merged the two, refactored, added tests - Matt Simerson
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=head1 LICENSE
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This software is free software and may be distributed under the same
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terms as qpsmtpd itself.
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=cut
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use strict;
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use warnings;
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use Qpsmtpd::Constants;
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use Qpsmtpd::DSN;
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sub hook_rcpt {
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my ($self, $transaction, $recipient, %param) = @_;
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return DECLINED if $self->is_immune();
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my ($host, $to) = $self->get_host_and_to($recipient)
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or return DECLINED;
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my @badrcptto = $self->qp->config("badrcptto") or do {
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$self->log(LOGINFO, "skip, empty config");
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return DECLINED;
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};
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for my $line (@badrcptto) {
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$line =~ s/^\s+//g; # trim leading whitespace
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my ($bad, $reason) = split /\s+/, $line, 2;
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next if !$bad;
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if ($self->is_match($to, lc($bad), $host)) {
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$self->adjust_karma(-2);
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if ($reason) {
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return DENY, $reason;
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}
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return Qpsmtpd::DSN->no_such_user("mail to $bad not accepted here");
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}
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}
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$self->log(LOGINFO, 'pass');
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return DECLINED;
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}
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sub is_match {
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my ($self, $to, $bad, $host) = @_;
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if ($bad =~ /[\/\^\$\*\+\!\%\?\\]/) { # it's a regexp
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$self->log(LOGDEBUG, "badmailfrom pattern ($bad) match for $to");
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if ($to =~ /$bad/i) {
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$self->log(LOGINFO, 'fail: pattern match');
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return 1;
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}
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return;
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}
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if ($bad !~ m/\@/) {
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$self->log(LOGERROR, "badrcptto: bad config: no \@ sign in $bad");
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return;
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}
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$bad = lc $bad;
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$to = lc $to;
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if (substr($bad, 0, 1) eq '@') {
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if ($bad eq "\@$host") {
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$self->log(LOGINFO, 'fail: host match');
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return 1;
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}
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return;
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}
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if ($bad eq $to) {
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$self->log(LOGINFO, 'fail: rcpt match');
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return 1;
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}
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return;
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}
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sub get_host_and_to {
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my ($self, $recipient) = @_;
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if (!$recipient) {
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$self->log(LOGERROR, 'skip: no recipient!');
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return;
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}
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if (!$recipient->host || !$recipient->user) {
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$self->log(LOGINFO, 'skip: missing host or user');
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return;
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}
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my $host = lc $recipient->host;
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return $host, lc($recipient->user) . '@' . $host;
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}
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