253 lines
7.3 KiB
Perl
253 lines
7.3 KiB
Perl
#!/usr/bin/perl
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=head1 NAME
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qmail_deliverable - Check that the recipient address is deliverable
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=head1 DESCRIPTION
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See the description of Qmail::Deliverable.
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This B<qpsmtpd plugin> uses the client/server interface and needs a running
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qmail-deliverabled. If no connection can be made, deliverability is simply
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assumed.
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The modules LWP (libwww-perl) and HTTP::Daemon, available from CPAN, are
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required for qmail-deliverabled and Qmail::Deliverable::Client.
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=head1 CONFIGURATION
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=over 4
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=item server host:port
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Hostname (or IP address), and port (both!) of the qmail-deliverabled server. If
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none is specified, the default (127.0.0.1:8998) is used.
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=item server smtproutes:host:port
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If the specification is prepended by the literal text C<smtproutes:>, then for
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recipient domains listed in your /var/qmail/control/smtproutes use their
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respective hosts for the check. For other domains, the given host is used. The
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port has to be the same across all servers.
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Example:
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qmail_deliverable server smtproutes:127.0.0.1:8998
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Use "smtproutes:8998" (no second colon) to simply skip the deliverability
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check for domains not listed in smtproutes.
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=item vpopmail_ext [ 0 | 1 ]
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Is vpopmail configured with the qmail-ext feature enabled? If so, this config
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option must be enabled in order for user-ext@example.org addresses to work.
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Default: 0
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=item reject
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karma reject [ 0 | 1 | connect | 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.
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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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=back
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=head1 CAVEATS
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Given a null host in smtproutes, the normal MX lookup should be used. This
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plugin does not do this, because we don't want to harrass arbitrary servers.
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Connection failure is *faked* when there is no smtproute.
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=head1 LEGAL
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This software is released into the public domain, and does not come with
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warranty or guarantee of any kind. Use it at your own risk.
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=head1 AUTHOR
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Juerd <#####@juerd.nl>
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=head1 SEE ALSO
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L<Qmail::Deliverable>, L<qmail-deliverabled>, L<Qmail::Deliverable::Client>
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=cut
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#################################
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#################################
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BEGIN {
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use FindBin qw($Bin $Script);
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if (not $INC{'Qpsmtpd.pm'}) {
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my $dir = '$PLUGINS_DIRECTORY';
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-d and $dir = $_ for qw(
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/home/qpsmtpd/plugins
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/home/smtp/qpsmtpd/plugins
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/usr/local/qpsmtpd/plugins
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/usr/local/share/qpsmtpd/plugins
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/usr/share/qpsmtpd/plugins
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);
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my $file = "the 'plugins' configuration file";
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-f and $file = $_ for qw(
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/home/qpsmtpd/config/plugins
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/home/smtp/qpsmtpd/config/plugins
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/usr/local/qpsmtpd/config/plugins
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/usr/local/etc/qpsmtpd/plugins
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/etc/qpsmtpd/plugins
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);
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# "die" would print "BEGIN failed" garbage
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print STDERR <<"END";
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This is a plugin for qpsmtpd and should not be run manually.
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To install the plugin:
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ln -s $Bin/$Script $dir/
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And add "$Script server 127.0.0.1:8998" to $file, before rcpt_ok.
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For configuration instructions, read "man $Script"
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(Paths may vary.)
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END
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exit 255;
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}
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}
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#################################
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#################################
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use strict;
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use warnings;
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use Qpsmtpd::Constants;
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use Qmail::Deliverable::Client qw(deliverable);
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my %smtproutes;
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my $shared_domain; # global variable to be closed over by the SERVER callback
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sub register {
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my ($self, $qp, @args) = @_;
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if (@args % 2) {
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$self->log(LOGWARN, "Odd number of arguments, using default config");
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}
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else {
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my %args = @args;
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if ($args{server} && $args{server} =~ /^smtproutes:/) {
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my ($fallback, $port) = $args{server} =~ /:(?:(.*?):?)(\d+)/;
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open my $fh, "/var/qmail/control/smtproutes"
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or warn "Could not read smtproutes";
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for (readline $fh) {
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my ($domain, $mx) = /^(.*?) : \[? ( [^\]:\s]* )/x;
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$smtproutes{$domain} = $mx;
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}
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$Qmail::Deliverable::Client::SERVER = sub {
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my $server = _smtproute($shared_domain);
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return "$server:$port" if defined $server;
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return "$fallback:$port" if defined $fallback;
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return;
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};
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}
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elsif ($args{server}) {
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$Qmail::Deliverable::Client::SERVER = $args{server};
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}
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if ($args{vpopmail_ext}) {
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$Qmail::Deliverable::VPOPMAIL_EXT = $args{vpopmail_ext};
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}
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if ($args{reject}) {
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$self->{_args}{reject} = $args{reject};
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}
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}
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$self->register_hook("rcpt", "rcpt_handler");
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}
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sub rcpt_handler {
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my ($self, $transaction, $rcpt) = @_;
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return DECLINED if $self->is_immune(); # requires QP 0.90+
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my $address = $rcpt->address;
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$self->log(LOGDEBUG, "Checking deliverability for recipient '$address'");
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$shared_domain = $rcpt->host;
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my $rv = deliverable $address;
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if (not defined $rv or not length $rv) {
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$self->log(LOGWARN, "error (unknown) checking '$address'");
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return DECLINED;
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}
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my $k = 0; # known status code
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$self->log(LOGINFO, "error, permission failure"), $k++ if $rv == 0x11;
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$self->log(LOGINFO, "pass, qmail-command in dot-qmail"), $k++
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if $rv == 0x12;
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$self->log(LOGINFO, "pass, bouncesaying with program"), $k++ if $rv == 0x13;
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if ($rv == 0x14) {
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my $s = $transaction->sender->address;
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return (DENY, "mailing lists do not accept null senders")
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if (!$s || $s eq '<>');
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$self->log(LOGINFO, "pass, ezmlm list");
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$k++;
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}
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$self->log(LOGINFO, "Temporarily undeliverable: group/world writable"), $k++
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if $rv == 0x21;
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$self->log(LOGINFO, "Temporarily undeliverable: sticky home directory"),
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$k++
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if $rv == 0x22;
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$self->log(LOGINFO, "error, $Qmail::Deliverable::Client::ERROR"), $k++
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if $rv == 0x2f;
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$self->log(LOGINFO, "pass, normal delivery"), $k++ if $rv == 0xf1;
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$self->log(LOGINFO, "pass, vpopmail dir"), $k++ if $rv == 0xf2;
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$self->log(LOGINFO, "pass, vpopmail alias"), $k++ if $rv == 0xf3;
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$self->log(LOGINFO, "pass, vpopmail catchall"), $k++ if $rv == 0xf4;
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$self->log(LOGINFO, "pass, vpopmail vuser"), $k++ if $rv == 0xf5;
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$self->log(LOGINFO, "pass, vpopmail qmail-ext"), $k++ if $rv == 0xf6;
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$self->log(LOGINFO, "error, SHOULD NOT HAPPEN"), $k++ if $rv == 0xfe;
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$self->log(LOGINFO, "fail, address not local"), $k++ if $rv == 0xff;
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if ($rv) {
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$self->log(LOGINFO, sprintf("error, unknown: 0x%02x", $rv)) if not $k;
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return DECLINED;
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}
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$self->adjust_karma(-1);
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return $self->get_reject("Sorry, no mailbox by that name. qd (#5.1.1)");
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}
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sub _smtproute {
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my ($domain) = @_;
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my @parts = split /\./, $domain;
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if (exists $smtproutes{$domain}) {
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return undef if $smtproutes{$domain} eq "";
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return $smtproutes{$domain};
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}
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for (reverse 1 .. @parts) {
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my $wildcard = join "", map ".$_", @parts[-$_ .. -1];
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if (exists $smtproutes{$wildcard}) {
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return undef if $smtproutes{$wildcard} eq "";
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return $smtproutes{$wildcard};
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}
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}
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return undef if not exists $smtproutes{""};
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return undef if $smtproutes{""} eq "";
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return $smtproutes{""};
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}
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