spamassassin 3.4.1-8build1 / usr / share / perl5 / Mail / SpamAssassin / Plugin / AccessDB.pm

This file is indexed.

/usr/share/perl5/Mail/SpamAssassin/Plugin/AccessDB.pm is in spamassassin 3.4.1-8build1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below. 

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
# <@LICENSE>
# 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

Mail::SpamAssassin::Plugin::AccessDB - check message against Access Database

=head1 SYNOPSIS

  loadplugin     Mail::SpamAssassin::Plugin::AccessDB

  header   ACCESSDB  eval:check_access_database('/etc/mail/access.db')
  describe ACCESSDB  Message would have been caught by accessdb
  tflags   ACCESSDB  userconf
  score    ACCESSDB  2

=head1 DESCRIPTION

Many MTAs support access databases, such as Sendmail, Postfix, etc.
This plugin does similar checks to see whether a message would have
been flagged.

The rule returns false if an entry isn't found, or the entry has a RHS of
I<OK> or I<SKIP>.

The rule returns true if an entry exists and has a RHS of I<REJECT>, I<ERROR>,
or I<DISCARD>.

Note: only the first word (split on non-word characters) of the RHS
is checked, so C<error:5.7.1:...> means C<ERROR>.

B<AccessDB Pointers:>

  http://www.faqs.org/docs/securing/chap22sec178.html
  http://www.postfix.org/access.5.html

=cut

package Mail::SpamAssassin::Plugin::AccessDB;

use Mail::SpamAssassin::Plugin;
use Mail::SpamAssassin::Logger;
use Fcntl;
use strict;
use warnings;
use bytes;
use re 'taint';

use vars qw(@ISA);
@ISA = qw(Mail::SpamAssassin::Plugin);

use constant HAS_DB_FILE => eval { require DB_File; };

sub new {
  my $class = shift;
  my $mailsaobject = shift;

  $class = ref($class) || $class;
  my $self = $class->SUPER::new($mailsaobject);
  bless ($self, $class);

  $self->register_eval_rule("check_access_database");

  return $self;
}

sub check_access_database {
  my ($self, $pms, $path) = @_;

  if (!HAS_DB_FILE) {
    return 0;
  }

  my %access;
  my %ok = map { $_ => 1 } qw/ OK SKIP /;
  my %bad = map { $_ => 1 } qw/ REJECT ERROR DISCARD /;

  $path = $self->{main}->sed_path ($path);
  dbg("accessdb: tie-ing to DB file R/O in $path");
  if (tie %access,"DB_File",$path, O_RDONLY) {
    my @lookfor;

    # Look for "From:" versions as well!
    foreach my $from ($pms->all_from_addrs()) {
      # $user."\@"
      # rotate through $domain and check
      my ($user,$domain) = split(/\@/, $from,2);
      push(@lookfor, "From:$from",$from);
      if ($user) {
        push(@lookfor, "From:$user\@", "$user\@");
      }
      if ($domain) {
        while ($domain =~ /\./) {
          push(@lookfor, "From:$domain", $domain);
          $domain =~ s/^[^.]*\.//;
        }
        push(@lookfor, "From:$domain", $domain);
      }
    }

    # we can only match this if we have at least 1 untrusted header
    if ($pms->{num_relays_untrusted} > 0) {
      my $lastunt = $pms->{relays_untrusted}->[0];

      # If there was a reverse lookup, use it in a lookup
      if (! $lastunt->{no_reverse_dns}) {
        my $rdns = $lastunt->{lc_rdns};
        while($rdns =~ /\./) {
          push(@lookfor, "From:$rdns", $rdns);
          $rdns =~ s/^[^.]*\.//;
        }
        push(@lookfor, "From:$rdns", $rdns);
      }

      # do both IP and net (rotate over IP)
      my ($ip) = $lastunt->{ip};
      $ip =~ tr/0-9.//cd;
      while($ip =~ /\./) {
        push(@lookfor, "From:$ip", $ip);
	$ip =~ s/\.[^.]*$//;
      }
      push(@lookfor, "From:$ip", $ip);
    }

    my $retval = 0;
    my %cache;
    foreach (@lookfor) {
      next if ($cache{$_}++);
      dbg("accessdb: looking for $_");

      # Some systems put a null at the end of the key, most don't...
      my $result = $access{$_} || $access{"$_\000"} || next;

      my ($type) = split(/\W/,$result);
      $type = uc $type;

      if (exists $ok{$type}) {
	dbg("accessdb: hit OK: $type, $_");
        $retval = 0;
	last;
      }
      if (exists $bad{$type} || $type =~ /^\d+$/) {
        $retval = 1;
	dbg("accessdb: hit not-OK: $type, $_");
      }
    }

    dbg("accessdb: untie-ing DB file $path");
    untie %access;

    return $retval;
  }
  else {
    dbg("accessdb: cannot open accessdb $path R/O: $!");
  }
  
  return 0;
}

1;

APT Browse - Built by Thomas Orozco.