160 lines
4.2 KiB
Perl
160 lines
4.2 KiB
Perl
#!perl -w
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=head1 NAME
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check_badmailfrom - checks the badmailfrom config, with per-line reasons
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=head1 DESCRIPTION
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Reads the "badmailfrom" configuration like qmail-smtpd does. From the
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qmail-smtpd docs:
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"Unacceptable envelope sender addresses. qmail-smtpd will reject every
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recipient address for a message if the envelope sender address is
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listed in badmailfrom. A line in badmailfrom may be of the form
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@host, meaning every address at host."
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You may include an optional message after the sender address (leave a space),
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to be used when rejecting the sender.
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=head1 CONFIGURATION
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=head2 reject
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badmailfrom reject [ 0 | 1 | naughty ]
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I<0> will not reject any connections.
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I<1> will reject naughty senders.
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I<connect> is the most efficient setting. It's also the default.
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To reject at any other connection hook, use the I<naughty> setting and the
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B<naughty> plugin.
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=head1 PATTERNS
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This plugin also supports regular expression matches. This allows
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special patterns to be denied (e.g. FQDN-VERP, percent hack, bangs,
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double ats).
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Patterns are stored in the format pattern(\s+)response, where pattern
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is a Perl pattern expression. Don't forget to anchor the pattern
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(front ^ and back $) if you want to restrict it from matching
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anywhere in the string.
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^streamsendbouncer@.*\.mailengine1\.com$ Your right-hand side VERP doesn't fool me
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^return.*@.*\.pidplate\.biz$ I don' want it regardless of subdomain
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^admin.*\.ppoonn400\.com$
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=head1 NOTES
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According to the SMTP protocol, we can't reject until after the RCPT
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stage, so store it until later.
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=head1 AUTHORS
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2002 - Jim Winstead - initial author of badmailfrom
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2010 - Johan Almqvist <johan-qpsmtpd@almqvist.net> - pattern matching plugin
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2012 - Matt Simerson - merging of the two and plugin tests
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=cut
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sub register {
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my ($self,$qp) = shift, shift;
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$self->{_args} = { @_ };
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# preserve legacy "reject during rcpt" behavior
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$self->{_args}{reject} = 1 if ! defined $self->{_args}{reject};
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return if ! $self->{_args}{reject}; # reject 0, log only
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return if $self->{_args}{reject} eq 'naughty'; # naughty will reject
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$self->register_hook('rcpt', 'rcpt_handler');
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};
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sub hook_mail {
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my ($self, $transaction, $sender, %param) = @_;
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return DECLINED if $self->is_immune();
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my @badmailfrom = $self->qp->config('badmailfrom');
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if ( defined $self->{_badmailfrom_config} ) { # testing
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@badmailfrom = @{$self->{_badmailfrom_config}};
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};
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return DECLINED if $self->is_immune_sender( $sender, \@badmailfrom );
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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 $config (@badmailfrom) {
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$config =~ s/^\s+//g; # trim leading whitespace
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my ($bad, $reason) = split /\s+/, $config, 2;
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next unless $bad;
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next unless $self->is_match( $from, $bad, $host );
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$reason ||= "Your envelope sender is in my badmailfrom list";
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$self->connection->notes('naughty', $reason);
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}
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if ( ! $self->connection->notes('naughty') ) {
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$self->log(LOGINFO, "pass");
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};
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return DECLINED;
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}
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sub is_match {
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my ( $self, $from, $bad, $host ) = @_;
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if ( $bad =~ /[\/\^\$\*\+]/ ) { # it's a regexp
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$self->log(LOGDEBUG, "badmailfrom pattern ($bad) match for $from");
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return 1 if $from =~ /$bad/;
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return;
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};
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$bad = lc $bad;
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if ( $bad !~ m/\@/ ) {
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$self->log(LOGWARN, "badmailfrom: bad config: no \@ sign in $bad");
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return;
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};
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if ( substr($bad,0,1) eq '@' ) {
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return 1 if $bad eq "\@$host";
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return;
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};
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return if $bad ne $from;
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return 1;
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};
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sub rcpt_handler {
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my ($self, $transaction, $rcpt, %param) = @_;
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my $note = $self->connection->notes('naughty') or return (DECLINED);
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$self->log(LOGINFO, "fail, $note");
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return (DENY, $note);
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}
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sub is_immune_sender {
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my ($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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