mailinabox/ppa/postgrey_sources.diff

101 lines
3.4 KiB
Diff
Raw Normal View History

Description: whitelist whatever dnswl.org whitelists
.
postgrey (1.35-1+miab1) unstable; urgency=low
.
* Added DNSWL.org whitelisting.
Author: Joshua Tauberer <jt@occams.info>
--- postgrey-1.35.orig/README
+++ postgrey-1.35/README
@@ -13,7 +13,7 @@ Requirements
- BerkeleyDB (Perl Module)
- Berkeley DB >= 4.1 (Library)
- Digest::SHA (Perl Module, only for --privacy option)
-
+- Net::DNS (Perl Module)
Documentation
-------------
--- postgrey-1.35.orig/postgrey
+++ postgrey-1.35/postgrey
@@ -18,6 +18,7 @@ use Fcntl ':flock'; # import LOCK_* cons
use Sys::Hostname;
use Sys::Syslog; # used only to find out which version we use
use POSIX qw(strftime setlocale LC_ALL);
+use Net::DNS; # for DNSWL.org whitelisting
use vars qw(@ISA);
@ISA = qw(Net::Server::Multiplex);
@@ -26,6 +27,8 @@ my $VERSION = '1.35';
my $DEFAULT_DBDIR = '/var/lib/postgrey';
my $CONFIG_DIR = '/etc/postgrey';
+my $dns_resolver = Net::DNS::Resolver->new;
+
sub cidr_parse($)
{
defined $_[0] or return undef;
@@ -48,6 +51,36 @@ sub cidr_match($$$)
return ($addr & $mask) == $net;
}
+sub reverseDottedQuad {
+ # This is the sub _chkValidPublicIP from Net::DNSBL by PJ Goodwin
+ # at http://www.the42.net/net-dnsbl.
+ my ($quad) = @_;
+ if ($quad =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/) {
+ my ($ip1,$ip2,$ip3,$ip4) = ($1, $2, $3, $4);
+ if (
+ $ip1 == 10 || #10.0.0.0/8 (10/8)
+ ($ip1 == 172 && $ip2 >= 16 && $ip2 <= 31) || #172.16.0.0/12 (172.16/12)
+ ($ip1 == 192 && $ip2 == 168) || #192.168.0.0/16 (192.168/16)
+ $quad eq '127.0.0.1' # localhost
+ ) {
+ # toss the RFC1918 specified privates
+ return undef;
+ } elsif (
+ ($ip1 <= 1 || $ip1 > 254) ||
+ ($ip2 < 0 || $ip2 > 255) ||
+ ($ip3 < 0 || $ip3 > 255) ||
+ ($ip4 < 0 || $ip4 > 255)
+ ) {
+ #invalid oct, toss it;
+ return undef;
+ }
+ my $revquad = $ip4 . "." . $ip3 . "." . $ip2 . "." . $ip1;
+ return $revquad;
+ } else { # invalid quad
+ return undef;
+ }
+}
+
sub read_clients_whitelists($)
{
my ($self) = @_;
@@ -361,6 +394,25 @@ sub smtpd_access_policy($$)
}
}
+ # whitelist clients in dnswl.org
+ my $revip = reverseDottedQuad($attr->{client_address});
+ if ($revip) { # valid IP / plausibly in DNSWL
+ my $answer = $dns_resolver->send($revip . '.list.dnswl.org');
+ if ($answer && scalar($answer->answer) > 0) {
+ my @rrs = $answer->answer;
+ if ($rrs[0]->type eq 'A' && $rrs[0]->address ne '127.0.0.255') {
+ # Address appears in DNSWL. (127.0.0.255 means we were rate-limited.)
+ my $code = $rrs[0]->address;
+ if ($code =~ /^127.0.(\d+)\.([0-3])$/) {
+ my %dnswltrust = (0 => 'legitimate', 1 => 'occasional spam', 2 => 'rare spam', 3 => 'highly unlikely to send spam');
+ $code = $2 . '/' . $dnswltrust{$2};
+ }
+ $self->mylog_action($attr, 'pass', 'client whitelisted by dnswl.org (' . $code . ')');
+ return 'DUNNO';
+ }
+ }
+ }
+
# auto whitelist clients (see below for explanation)
my ($cawl_db, $cawl_key, $cawl_count, $cawl_last);
if($self->{postgrey}{awl_clients}) {