137 lines
3.8 KiB
Perl
137 lines
3.8 KiB
Perl
#!/usr/bin/perl -w
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use Qpsmtpd::DSN;
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use ParaDNS;
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use Socket;
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use Qpsmtpd::TcpServer;
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my %invalid = ();
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my $has_ipv6 = Qpsmtpd::TcpServer::has_ipv6();
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sub register {
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my ( $self, $qp ) = @_;
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foreach my $i ( $self->qp->config("invalid_resolvable_fromhost") ) {
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$i =~ s/^\s*//;
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$i =~ s/\s*$//;
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if ( $i =~ m#^((\d{1,3}\.){3}\d{1,3})/(\d\d?)# ) {
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$invalid{$1} = $3;
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}
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}
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$self->register_hook( mail => 'hook_mail_start' );
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$self->register_hook( mail => 'hook_mail_done' );
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}
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sub hook_mail_start {
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my ( $self, $transaction, $sender ) = @_;
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return DECLINED
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if ( $self->qp->connection->notes('whitelistclient') );
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if ( $sender ne "<>" ) {
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unless ( $sender->host ) {
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# default of addr_bad_from_system is DENY, we use DENYSOFT here to
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# get the same behaviour as without Qpsmtpd::DSN...
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return Qpsmtpd::DSN->addr_bad_from_system( DENYSOFT,
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"FQDN required in the envelope sender" );
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}
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$self->check_dns( $sender->host );
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return YIELD;
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}
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return DECLINED;
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}
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sub hook_mail_done {
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my ( $self, $transaction, $sender ) = @_;
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return DECLINED
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if ( $self->qp->connection->notes('whitelistclient') );
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if (!$transaction->notes('resolvable_fromhost')) {
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# default of temp_resolver_failed is DENYSOFT
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return Qpsmtpd::DSN->temp_resolver_failed(
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"Could not resolve " . $sender->host );
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}
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return DECLINED;
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}
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sub check_dns {
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my ( $self, $host ) = @_;
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my @host_answers;
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return if $host =~ m/^\[(\d{1,3}\.){3}\d{1,3}\]$/;
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my $qp = $self->qp;
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my $a_records = [];
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my $num_queries = $has_ipv6 ? 2 : 1;
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ParaDNS->new(
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callback => sub {
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my $mx = shift;
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return if $mx =~ /^[A-Z]+$/; # error
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my $addr = $mx->[0];
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$num_queries++;
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ParaDNS->new(
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callback => sub { push @$a_records, $_[0] if $_[0] !~ /^[A-Z]+$/; },
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finished => sub { $num_queries--; $self->finish_up($qp, $a_records) unless $num_queries; },
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host => $addr,
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type => 'A',
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);
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if ($has_ipv6) {
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$num_queries++;
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ParaDNS->new(
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callback => sub { push @$a_records, $_[0] if $_[0] !~ /^[A-Z]+$/; },
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finished => sub { $num_queries--; $self->finish_up($qp, $a_records) unless $num_queries; },
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host => $addr,
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type => 'AAAA',
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);
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}
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},
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host => $host,
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type => 'MX',
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);
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ParaDNS->new(
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callback => sub { push @$a_records, $_[0] if $_[0] !~ /^[A-Z]+$/; },
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finished => sub { $num_queries--; $self->finish_up($qp, $a_records) unless $num_queries },
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host => $host,
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type => 'A',
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);
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ParaDNS->new(
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callback => sub { push @$a_records, $_[0] if $_[0] !~ /^[A-Z]+$/; },
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finished => sub { $num_queries--; $self->finish_up($qp, $a_records) unless $num_queries },
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host => $host,
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type => 'AAAA',
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) if $has_ipv6;
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}
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sub finish_up {
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my ($self, $qp, $a_records) = @_;
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foreach my $addr (@$a_records) {
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if (is_valid($addr)) {
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$qp->transaction->notes('resolvable_fromhost', 1);
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last;
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}
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}
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$qp->run_continuation;
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}
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sub is_valid {
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my $ip = shift;
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my ( $net, $mask );
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foreach $net ( keys %invalid ) {
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$mask = $invalid{$net};
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$mask = pack "B32", "1" x ($mask) . "0" x ( 32 - $mask );
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return 0
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if join( ".", unpack( "C4", inet_aton($ip) & $mask ) ) eq $net;
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}
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return 1;
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}
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# vim: ts=4 sw=4 expandtab syn=perl
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