/usr/share/perl5/Mail/SpamAssassin/Plugin/URILocalBL.pm is in spamassassin 3.4.2-1~deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to you under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# </@LICENSE>
=head1 NAME
URILocalBL - blacklist URIs using local information (ISP names, address lists, and country codes)
=head1 SYNOPSIS
This plugin creates some new rule test types, such as "uri_block_cc",
"uri_block_cidr", and "uri_block_isp". These rules apply to the URIs
found in the HTML portion of a message, i.e. <a href=...> markup.
loadplugin Mail::SpamAssassin::Plugin::URILocalBL
Why local blacklisting? There are a few excellent, effective, and
well-maintained DNSBL's out there. But they have several drawbacks:
=over 2
=item * blacklists can cover tens of thousands of entries, and you can't select which ones you use;
=item * verifying that it's correctly configured can be non-trivial;
=item * new blacklisting entries may take a while to be detected and entered, so it's not instantaneous.
=back
Sometimes all you want is a quick, easy, and very surgical blacklisting of
a particular site or a particular ISP. This plugin is defined for that
exact usage case.
=head1 RULE DEFINITIONS AND PRIVILEGED SETTINGS
The format for defining a rule is as follows:
uri_block_cc SYMBOLIC_TEST_NAME cc1 cc2 cc3 cc4
or:
uri_block_cont SYMBOLIC_TEST_NAME co1 co2 co3 co4
or:
uri_block_cidr SYMBOLIC_TEST_NAME a.a.a.a b.b.b.b/cc d.d.d.d-e.e.e.e
or:
uri_block_isp SYMBOLIC_TEST_NAME "DataRancid" "McCarrier" "Phishers-r-Us"
Example rule for matching a URI in China:
uri_block_cc TEST1 cn
This would block the URL http://www.baidu.com/index.htm. Similarly, to
match a Spam-haven netblock:
uri_block_cidr TEST2 65.181.64.0/18
would match a netblock where several phishing sites were recently hosted.
And to block all CIDR blocks registered to an ISP, one might use:
uri_block_isp TEST3 "ColoCrossing"
if one didn't trust URL's pointing to that organization's clients. Lastly,
if there's a country that you want to block but there's an explicit host
you wish to exempt from that blacklist, you can use:
uri_block_exclude TEST1 www.baidu.com
if you wish to exempt URL's referring to this host. The same syntax is
applicable to CIDR and ISP blocks as well.
=head1 DEPENDENCIES
The Country-Code based filtering requires the Geo::IP or GeoIP2 module,
which uses either the fremium GeoLiteCountry database, or the commercial
version of it called GeoIP from MaxMind.com.
The ISP based filtering requires the same module, plus the GeoIPISP database.
There is no fremium version of this database, so commercial licensing is
required.
=cut
package Mail::SpamAssassin::Plugin::URILocalBL;
use Mail::SpamAssassin::Plugin;
use Mail::SpamAssassin::Logger;
use Mail::SpamAssassin::Util qw(untaint_var);
use Net::CIDR::Lite;
use Socket;
use strict;
use warnings;
# use bytes;
use re 'taint';
use version;
our @ISA = qw(Mail::SpamAssassin::Plugin);
use constant HAS_GEOIP => eval { require Geo::IP; };
use constant HAS_GEOIP2 => eval { require GeoIP2::Database::Reader; };
# constructor
sub new {
my $class = shift;
my $mailsaobject = shift;
# some boilerplate...
$class = ref($class) || $class;
my $self = $class->SUPER::new($mailsaobject);
bless ($self, $class);
# how to handle failure to get the database handle?
# and we don't really have a valid return value...
# can we defer getting this handle until we actually see
# a uri_block_cc rule?
$self->register_eval_rule("check_uri_local_bl");
$self->set_config($mailsaobject->{conf});
return $self;
}
sub set_config {
my ($self, $conf) = @_;
my @cmds;
my $pluginobj = $self; # allow use inside the closure below
push (@cmds, {
setting => 'uri_block_cc',
is_priv => 1,
code => sub {
my ($self, $key, $value, $line) = @_;
if ($value !~ /^(\S+)\s+(.+)$/) {
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
my $name = $1;
my $def = $2;
my $added_criteria = 0;
$conf->{parser}->{conf}->{uri_local_bl}->{$name}->{countries} = {};
# this should match all country codes including satellite providers
while ($def =~ m/^\s*([a-z][a-z0-9])(\s+(.*)|)$/) {
my $cc = $1;
my $rest = $2;
#dbg("config: uri_block_cc adding %s to %s\n", $cc, $name);
$conf->{parser}->{conf}->{uri_local_bl}->{$name}->{countries}->{uc($cc)} = 1;
$added_criteria = 1;
$def = $rest;
}
if ($added_criteria == 0) {
warn "config: no arguments";
return $Mail::SpamAssassin::Conf::MISSING_REQUIRED_VALUE;
} elsif ($def ne '') {
warn "config: failed to add invalid rule $name";
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
dbg("config: uri_block_cc added %s\n", $name);
$conf->{parser}->add_test($name, 'check_uri_local_bl()', $Mail::SpamAssassin::Conf::TYPE_BODY_EVALS);
}
});
push (@cmds, {
setting => 'uri_block_cont',
is_priv => 1,
code => sub {
my ($self, $key, $value, $line) = @_;
if ($value !~ /^(\S+)\s+(.+)$/) {
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
my $name = $1;
my $def = $2;
my $added_criteria = 0;
$conf->{parser}->{conf}->{uri_local_bl}->{$name}->{continents} = {};
# this should match all continent codes
while ($def =~ m/^\s*([a-z]{2})(\s+(.*)|)$/) {
my $cont = $1;
my $rest = $2;
# dbg("config: uri_block_cont adding %s to %s\n", $cont, $name);
$conf->{parser}->{conf}->{uri_local_bl}->{$name}->{continents}->{uc($cont)} = 1;
$added_criteria = 1;
$def = $rest;
}
if ($added_criteria == 0) {
warn "config: no arguments";
return $Mail::SpamAssassin::Conf::MISSING_REQUIRED_VALUE;
} elsif ($def ne '') {
warn "config: failed to add invalid rule $name";
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
dbg("config: uri_block_cont added %s\n", $name);
$conf->{parser}->add_test($name, 'check_uri_local_bl()', $Mail::SpamAssassin::Conf::TYPE_BODY_EVALS);
}
});
push (@cmds, {
setting => 'uri_block_isp',
is_priv => 1,
code => sub {
my ($self, $key, $value, $line) = @_;
if ($value !~ /^(\S+)\s+(.+)$/) {
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
my $name = $1;
my $def = $2;
my $added_criteria = 0;
$conf->{parser}->{conf}->{uri_local_bl}->{$name}->{isps} = {};
# gather up quoted strings
while ($def =~ m/^\s*"([^"]*)"(\s+(.*)|)$/) {
my $isp = $1;
my $rest = $2;
dbg("config: uri_block_isp adding \"%s\" to %s\n", $isp, $name);
$conf->{parser}->{conf}->{uri_local_bl}->{$name}->{isps}->{$isp} = 1;
$added_criteria = 1;
$def = $rest;
}
if ($added_criteria == 0) {
warn "config: no arguments";
return $Mail::SpamAssassin::Conf::MISSING_REQUIRED_VALUE;
} elsif ($def ne '') {
warn "config: failed to add invalid rule $name";
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
$conf->{parser}->add_test($name, 'check_uri_local_bl()', $Mail::SpamAssassin::Conf::TYPE_BODY_EVALS);
}
});
push (@cmds, {
setting => 'uri_block_cidr',
is_priv => 1,
code => sub {
my ($self, $key, $value, $line) = @_;
if ($value !~ /^(\S+)\s+(.+)$/) {
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
my $name = $1;
my $def = $2;
my $added_criteria = 0;
$conf->{parser}->{conf}->{uri_local_bl}->{$name}->{cidr} = new Net::CIDR::Lite;
# match individual IP's, subnets, and ranges
while ($def =~ m/^\s*(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(\/\d{1,2}|-\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})?)(\s+(.*)|)$/) {
my $addr = $1;
my $rest = $3;
dbg("config: uri_block_cidr adding %s to %s\n", $addr, $name);
eval { $conf->{parser}->{conf}->{uri_local_bl}->{$name}->{cidr}->add_any($addr) };
last if ($@);
$added_criteria = 1;
$def = $rest;
}
if ($added_criteria == 0) {
warn "config: no arguments";
return $Mail::SpamAssassin::Conf::MISSING_REQUIRED_VALUE;
} elsif ($def ne '') {
warn "config: failed to add invalid rule $name";
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
# optimize the ranges
$conf->{parser}->{conf}->{uri_local_bl}->{$name}->{cidr}->clean();
$conf->{parser}->add_test($name, 'check_uri_local_bl()', $Mail::SpamAssassin::Conf::TYPE_BODY_EVALS);
}
});
push (@cmds, {
setting => 'uri_block_exclude',
is_priv => 1,
code => sub {
my ($self, $key, $value, $line) = @_;
if ($value !~ /^(\S+)\s+(.+)$/) {
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
my $name = $1;
my $def = $2;
my $added_criteria = 0;
$conf->{parser}->{conf}->{uri_local_bl}->{$name}->{exclusions} = {};
# match individual IP's, or domain names
while ($def =~ m/^\s*((\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})|(([a-z0-9][-a-z0-9]*[a-z0-9](\.[a-z0-9][-a-z0-9]*[a-z0-9]){1,})))(\s+(.*)|)$/) {
my $addr = $1;
my $rest = $6;
dbg("config: uri_block_exclude adding %s to %s\n", $addr, $name);
$conf->{parser}->{conf}->{uri_local_bl}->{$name}->{exclusions}->{$addr} = 1;
$added_criteria = 1;
$def = $rest;
}
if ($added_criteria == 0) {
warn "config: no arguments";
return $Mail::SpamAssassin::Conf::MISSING_REQUIRED_VALUE;
} elsif ($def ne '') {
warn "config: failed to add invalid rule $name";
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
$conf->{parser}->add_test($name, 'check_uri_local_bl()', $Mail::SpamAssassin::Conf::TYPE_BODY_EVALS);
}
});
=over 2
=item uri_country_db_path STRING
This option tells SpamAssassin where to find the MaxMind country GeoIP2
database.
=back
=cut
push (@cmds, {
setting => 'uri_country_db_path',
is_priv => 1,
default => undef,
type => $Mail::SpamAssassin::Conf::CONF_TYPE_STRING,
code => sub {
my ($self, $key, $value, $line) = @_;
if (!defined $value || !length $value) {
return $Mail::SpamAssassin::Conf::MISSING_REQUIRED_VALUE;
}
if (!-f $value) {
info("config: uri_country_db_path \"$value\" is not accessible");
$self->{uri_country_db_path} = $value;
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
$self->{uri_country_db_path} = $value;
}
});
=over 2
=item uri_country_db_isp_path STRING
This option tells SpamAssassin where to find the MaxMind isp GeoIP2 database.
=back
=cut
push (@cmds, {
setting => 'uri_country_db_isp_path',
is_priv => 1,
default => undef,
type => $Mail::SpamAssassin::Conf::CONF_TYPE_STRING,
code => sub {
my ($self, $key, $value, $line) = @_;
if (!defined $value || !length $value) {
return $Mail::SpamAssassin::Conf::MISSING_REQUIRED_VALUE;
}
if (!-f $value) {
info("config: uri_country_db_isp_path \"$value\" is not accessible");
$self->{uri_country_db_isp_path} = $value;
return $Mail::SpamAssassin::Conf::INVALID_VALUE;
}
$self->{uri_country_db_isp_path} = $value;
}
});
$conf->{parser}->register_commands(\@cmds);
}
sub check_uri_local_bl {
my ($self, $permsg) = @_;
my $cc;
my $cont;
my $db_info;
my $isp;
my $conf_country_db_path = $self->{'main'}{'resolver'}{'conf'}->{uri_country_db_path};
my $conf_country_db_isp_path = $self->{'main'}{'resolver'}{'conf'}->{uri_country_db_isp_path};
# If country_db_path is set I am using GeoIP2 api
if ( HAS_GEOIP2 and ( ( defined $conf_country_db_path ) or ( defined $conf_country_db_isp_path ) ) ) {
$self->{geoip} = GeoIP2::Database::Reader->new(
file => $conf_country_db_path,
locales => [ 'en' ]
) if (( defined $conf_country_db_path ) && ( -f $conf_country_db_path));
if ( defined ($conf_country_db_path) ) {
$db_info = sub { return "GeoIP2 " . ($self->{geoip}->metadata()->description()->{en} || '?') };
warn "$conf_country_db_path not found" unless $self->{geoip};
}
$self->{geoisp} = GeoIP2::Database::Reader->new(
file => $conf_country_db_isp_path,
locales => [ 'en' ]
) if (( defined $conf_country_db_isp_path ) && ( -f $conf_country_db_isp_path));
if ( defined ($conf_country_db_isp_path) ) {
warn "$conf_country_db_isp_path not found" unless $self->{geoisp};
}
$self->{use_geoip2} = 1;
} elsif ( HAS_GEOIP ) {
BEGIN {
Geo::IP->import( qw(GEOIP_MEMORY_CACHE GEOIP_CHECK_CACHE GEOIP_ISP_EDITION) );
}
$self->{use_geoip2} = 0;
# need GeoIP C library 1.6.3 and GeoIP perl API 1.4.4 or later to avoid messages leaking - Bug 7153
my $gic_wanted = version->parse('v1.6.3');
my $gic_have = version->parse(Geo::IP->lib_version());
my $gip_wanted = version->parse('v1.4.4');
my $gip_have = version->parse($Geo::IP::VERSION);
# this code burps an ugly message if it fails, but that's redirected elsewhere
my $flags = 0;
eval '$flags = Geo::IP::GEOIP_SILENCE' if ($gip_wanted >= $gip_have);
if ($flags && $gic_wanted >= $gic_have) {
$self->{geoip} = Geo::IP->new(GEOIP_MEMORY_CACHE | GEOIP_CHECK_CACHE | $flags);
$self->{geoisp} = Geo::IP->open_type(GEOIP_ISP_EDITION, GEOIP_MEMORY_CACHE | GEOIP_CHECK_CACHE | $flags);
} else {
open(OLDERR, ">&STDERR");
open(STDERR, ">", "/dev/null");
$self->{geoip} = Geo::IP->new(GEOIP_MEMORY_CACHE | GEOIP_CHECK_CACHE);
$self->{geoisp} = Geo::IP->open_type(GEOIP_ISP_EDITION, GEOIP_MEMORY_CACHE | GEOIP_CHECK_CACHE);
open(STDERR, ">&OLDERR");
close(OLDERR);
}
$db_info = sub { return "Geo::IP " . ($self->{geoip}->database_info || '?') };
} else {
dbg("No GeoIP module available");
return 0;
}
my %uri_detail = %{ $permsg->get_uri_detail_list() };
my $test = $permsg->{current_rule_name};
my $rule = $permsg->{conf}->{uri_local_bl}->{$test};
my %hit_tests;
my $got_hit = 0;
if ( defined $self->{geoip} ) {
dbg("check: uri_local_bl evaluating rule %s using database %s\n", $test, $db_info->());
} else {
dbg("check: uri_local_bl evaluating rule %s\n", $test);
}
while (my ($raw, $info) = each %uri_detail) {
next unless $info->{hosts};
# look for W3 links only
next unless (defined $info->{types}->{a});
while (my($host, $domain) = each %{$info->{hosts}}) {
# skip if the domain name was matched
if (exists $rule->{exclusions} && exists $rule->{exclusions}->{$domain}) {
dbg("check: uri_local_bl excludes %s as *.%s\n", $host, $domain);
next;
}
# this would be best cached from prior lookups
my @addrs = gethostbyname($host);
# convert to string values address list
@addrs = map { inet_ntoa($_); } @addrs[4..$#addrs];
dbg("check: uri_local_bl %s addrs %s\n", $host, join(', ', @addrs));
for my $ip (@addrs) {
# skip if the address was matched
if (exists $rule->{exclusions} && exists $rule->{exclusions}->{$ip}) {
dbg("check: uri_local_bl excludes %s(%s)\n", $host, $ip);
next;
}
if (exists $rule->{countries}) {
dbg("check: uri_local_bl countries %s\n", join(' ', sort keys %{$rule->{countries}}));
if ( $self->{use_geoip2} == 1 ) {
my $country = $self->{geoip}->country( ip => $ip );
my $country_rec = $country->country();
$cc = $country_rec->iso_code();
} else {
$cc = $self->{geoip}->country_code_by_addr($ip);
}
dbg("check: uri_local_bl host %s(%s) maps to %s\n", $host, $ip, (defined $cc ? $cc : "(undef)"));
# handle there being no associated country (yes, there are holes in
# the database).
next unless defined $cc;
# not in blacklist
next unless (exists $rule->{countries}->{$cc});
dbg("check: uri_block_cc host %s(%s) matched\n", $host, $ip);
if (would_log('dbg', 'rules') > 1) {
dbg("check: uri_block_cc criteria for $test met");
}
$permsg->test_log("Host: $host in $cc");
$hit_tests{$test} = 1;
# reset hash
keys %uri_detail;
}
if (exists $rule->{continents}) {
dbg("check: uri_local_bl continents %s\n", join(' ', sort keys %{$rule->{continents}}));
if ( $self->{use_geoip2} == 1 ) {
my $country = $self->{geoip}->country( ip => $ip );
my $cont_rec = $country->continent();
$cont = $cont_rec->{code};
} else {
$cc = $self->{geoip}->country_code_by_addr($ip);
$cont = $self->{geoip}->continent_code_by_country_code($cc);
}
dbg("check: uri_local_bl host %s(%s) maps to %s\n", $host, $ip, (defined $cont ? $cont : "(undef)"));
# handle there being no associated continent (yes, there are holes in
# the database).
next unless defined $cont;
# not in blacklist
next unless (exists $rule->{continents}->{$cont});
dbg("check: uri_block_cont host %s(%s) matched\n", $host, $ip);
if (would_log('dbg', 'rules') > 1) {
dbg("check: uri_block_cont criteria for $test met");
}
$permsg->test_log("Host: $host in $cont");
$hit_tests{$test} = 1;
# reset hash
keys %uri_detail;
}
if (exists $rule->{isps}) {
dbg("check: uri_local_bl isps %s\n", join(' ', map { '"' . $_ . '"'; } sort keys %{$rule->{isps}}));
if ( $self->{use_geoip2} == 1 ) {
$isp = $self->{geoisp}->isp(ip => $ip);
} else {
$isp = $self->{geoisp}->isp_by_name($ip);
}
dbg("check: uri_local_bl isp %s(%s) maps to %s\n", $host, $ip, (defined $isp ? '"' . $isp . '"' : "(undef)"));
# handle there being no associated country
next unless defined $isp;
# not in blacklist
next unless (exists $rule->{isps}->{$isp});
dbg("check: uri_block_isp host %s(%s) matched\n", $host, $ip);
if (would_log('dbg', 'rules') > 1) {
dbg("check: uri_block_isp criteria for $test met");
}
$permsg->test_log("Host: $host in \"$isp\"");
$hit_tests{$test} = 1;
# reset hash
keys %uri_detail;
}
if (exists $rule->{cidr}) {
dbg("check: uri_block_cidr list %s\n", join(' ', $rule->{cidr}->list_range()));
next unless ($rule->{cidr}->find($ip));
dbg("check: uri_block_cidr host %s(%s) matched\n", $host, $ip);
if (would_log('dbg', 'rules') > 1) {
dbg("check: uri_block_cidr criteria for $test met");
}
$permsg->test_log("Host: $host as $ip");
$hit_tests{$test} = 1;
# reset hash
keys %uri_detail;
}
}
}
# cycle through all tests hitted by the uri
while((my $test_ok) = each %hit_tests) {
$permsg->got_hit($test_ok);
$got_hit = 1;
}
if($got_hit == 1) {
return 1;
} else {
keys %hit_tests;
}
}
dbg("check: uri_local_bl %s no match\n", $test);
return 0;
}
1;
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