1 | # DNSBL
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2 | # Functions for interacting with the DNSBL database
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3 | ##
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4 | # $Id: DNSBL.pm 40 2012-03-04 20:02:13Z kdeugau $
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5 | # Copyright 2009-2011 Kris Deugau <kdeugau@deepnet.cx>
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6 | #
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7 | # This program is free software: you can redistribute it and/or modify
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8 | # it under the terms of the GNU General Public License as published by
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9 | # the Free Software Foundation, either version 3 of the License, or
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10 | # (at your option) any later version.
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11 | #
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12 | # This program is distributed in the hope that it will be useful,
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13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | # GNU General Public License for more details.
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16 | #
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17 | # You should have received a copy of the GNU General Public License
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18 | # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 | ##
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20 |
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21 | package DNSBL;
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22 |
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23 | use strict;
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24 | use warnings;
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25 | use Exporter;
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26 | use DBI;
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27 | use NetAddr::IP;
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28 |
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29 | use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
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30 |
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31 | $VERSION = 2.1;
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32 | @ISA = qw(Exporter);
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33 | @EXPORT_OK = qw(
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34 | );
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35 |
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36 | @EXPORT = (); # Export nothing by default.
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37 | %EXPORT_TAGS = ( ALL => [qw(
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38 | )]
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39 | );
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40 |
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41 | ## "constants"
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42 |
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43 | # w00t! somewhere along the line, by accident or intent, SA's
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44 | # check_dnsbl_sub can now check up to 24 bits of an DNSBL return value!
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45 | # 1 not available so we don't $self->shoot(foot)
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46 | our %bitfields = (
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47 | # block levels
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48 | 0 => 16,
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49 | 1 => 8,
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50 | 2 => 4,
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51 | # ip
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52 | ip => 2,
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53 | # OOB
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54 | org0 => 32,
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55 | block0 => 64,
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56 | org1 => 256,
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57 | org2 => 512,
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58 | block1 => 1024,
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59 | block2 => 2048,
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60 | # "I'm a total spamming moron!" - per-IP only!
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61 | slist => 128
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62 | );
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63 |
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64 | # probably needs some tuning; even 7 hits in a /24 is a pretty small percentage
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65 | # number of IPs in a block of the given masklength needed to have that block automatically listed
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66 | # defaults: (overridden by entries in db:autolist)
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67 | our %autolist = (
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68 | 31 => 1,
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69 | 30 => 1,
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70 | 29 => 2,
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71 | 28 => 3,
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72 | 27 => 4,
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73 | 26 => 5,
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74 | 25 => 6,
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75 | 24 => 7,
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76 | 23 => 8,
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77 | 22 => 10,
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78 | 21 => 13,
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79 | 20 => 16,
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80 | 19 => 19,
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81 | 18 => 22,
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82 | 17 => 26,
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83 | 16 => 30,
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84 | 15 => 34,
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85 | 14 => 38,
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86 | 13 => 42,
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87 | 12 => 46,
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88 | 11 => 50,
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89 | 10 => 54,
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90 | 9 => 58,
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91 | 8 => 62,
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92 | 7 => 2**31,
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93 | 6 => 2**31,
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94 | 5 => 2**31,
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95 | 4 => 2**31,
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96 | 3 => 2**31,
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97 | 2 => 2**31,
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98 | 1 => 2**31,
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99 | 0 => 2**31
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100 | );
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101 |
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102 | # le sigh. constants for masklength iterationing
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103 | our @howmany = (1,128,64,32,16,8,4,2,1,128,64,32,16,8,4,2,1,128,64,32,16,8,4,2,1,128,64,32,16,8,4,2);
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104 |
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105 | # variables
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106 | our $dbh;
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107 |
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108 | our $err;
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109 | our $errstr;
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110 |
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111 | # basic object subs
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112 | sub new {
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113 | # iff we want to start taking arguments, or doing other things on instantiation
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114 | # my $self = {};
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115 | # bless $self, "DNSBL";
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116 | # return $self;
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117 | bless {};
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118 | }
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119 |
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120 | sub DESTROY {
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121 | my $self = shift;
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122 | $self->dbclose() if $dbh;
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123 | }
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124 |
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125 | # JIC someone wants to close the db but not finish the script
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126 | sub dbclose {
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127 | $dbh->rollback;
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128 | $dbh->disconnect;
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129 | }
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130 |
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131 | ## specific object subs:
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132 |
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133 | sub connect {
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134 | my $self = shift;
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135 | my $dbhost = shift;
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136 | my $dbname = shift;
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137 | my $dbuser = shift;
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138 | my $dbpass = shift;
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139 | ## want to NOT autocommit everything, it's unlikely we'll step on our own toes but...
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140 | $dbh = DBI->connect("DBI:Pg:host=$dbhost;dbname=$dbname", $dbuser, $dbpass, {
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141 | AutoCommit => 0,
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142 | PrintError => 1
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143 | })
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144 | or die "database inaccessible: ".$DBI::errstr;
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145 | my $sth = $dbh->prepare("SELECT masklen,ipcount FROM autolist");
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146 | $sth->execute;
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147 | while (my ($masklen,$ipcount) = $sth->fetchrow_array) {
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148 | $autolist{$masklen} = $ipcount;
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149 | }
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150 | return $dbh;
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151 | }
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152 |
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153 |
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154 | ## DNSBLDB::initexport()
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155 | # Prepare a couple of statement handles for later processing in export(). Assists in ~3x speed increase.
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156 | my $parsth;
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157 | my $sthmoron;
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158 | sub initexport {
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159 | $parsth = $dbh->prepare("SELECT count(i.ip),b.block,b.level,b.listme AS oobblock,o.listme AS ooborg ".
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160 | "FROM iplist i INNER JOIN blocks b ON i.parent = b.block INNER JOIN orgs o ON b.orgid = o.orgid ".
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161 | "WHERE b.block >>= ? ".
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162 | "GROUP BY b.block,b.level,b.listme,o.listme ORDER BY b.block");
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163 | $sthmoron = $dbh->prepare("SELECT ip,s4list FROM iplist WHERE parent = ?");
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164 | }
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165 |
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166 |
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167 | ## DNSBL::ipexists()
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168 | # return report count if the IP has been reported, otherwise return undef
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169 | sub ipexists {
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170 | my $self = shift;
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171 | my $ip = shift;
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172 | my $sth = $dbh->prepare("SELECT count FROM iplist WHERE ip=?");
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173 | $sth->execute($ip);
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174 | my ($ret) = $sth->fetchrow_array();
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175 | return $ret;
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176 | } # end ipexists()
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177 |
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178 |
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179 | # report an IP or URI to the db
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180 | # increments a hit counter iff the reported IP or URI exists, otherwise it adds it
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181 | sub report {
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182 | my $self = shift;
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183 | my $rep = shift;
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184 | my $sth;
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185 | my $rows = 0;
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186 | if ($rep =~ /^[\d.]+$/) {
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187 | # weesa gonna ASS-U-ME IP addresses are sanely formatted.
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188 | eval {
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189 | $sth = $dbh->prepare("SELECT count FROM iplist WHERE ip=?");
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190 | $sth->execute($rep) or die "eep? ".$dbh->errstr."\n";
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191 | $rows = $sth->rows;
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192 | if ($rows == 0) {
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193 | $sth = $dbh->prepare("INSERT INTO iplist (ip,parent) VALUES ".
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194 | "(?,(SELECT block FROM blocks WHERE block >> ? ORDER BY level DESC LIMIT 1))");
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195 | $sth->execute($rep,$rep) or die "couldn't add entry for $rep: ".$dbh->errstr."\n";
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196 | } elsif ($rows == 1) {
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197 | $sth = $dbh->prepare("UPDATE iplist SET count=count+1 WHERE ip=?");
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198 | $sth->execute($rep) or die "couldn't update listing for $rep: ".$dbh->errstr."\n";
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199 | } else {
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200 | die "db corrupt: found $rows matches on $rep\n";
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201 | }
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202 | $sth = $dbh->prepare("SELECT block FROM blocks WHERE block >> ?");
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203 | $sth->execute($rep);
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204 | my $updsth = $dbh->prepare("UPDATE blocks SET ipcount=(SELECT count(*) FROM iplist WHERE ip << ?) WHERE block=?");
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205 | while (my ($block) = $sth->fetchrow_array) {
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206 | $updsth->execute($block,$block);
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207 | }
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208 | $dbh->commit;
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209 | };
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210 | if ($@) {
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211 | my $msg = $@;
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212 | return "failed adding $rep: $msg";
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213 | }
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214 | } else {
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215 | return;
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216 | }
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217 | return $rows;
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218 | } # end report()
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219 |
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220 |
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221 | # add a new org
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222 | # return the orgid
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223 | # if the org exists, return the orgid anyway
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224 | sub addorg {
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225 | my $self = shift;
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226 | my $orgname = shift;
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227 | my $listme = shift || 'n';
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228 | my $ret = $self->orgexists($orgname);
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229 | return $ret if $ret;
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230 | my $sth = $dbh->prepare("INSERT INTO orgs (orgname,listme) VALUES (?,?)");
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231 | $sth->execute($orgname,$listme) or die "couldn't add org $orgname: ".$dbh->errstr."\n";
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232 | $dbh->commit;
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233 | $sth = $dbh->prepare("SELECT orgid FROM orgs WHERE orgname=?");
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234 | $sth->execute($orgname);
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235 | my ($orgid) = $sth->fetchrow_array();
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236 | return $orgid;
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237 | } # end addorg
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238 |
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239 |
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240 | # checks for existence - nb, exact match! No way to really handle anything else. :/
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241 | sub orgexists {
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242 | my $self = shift;
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243 | my $org = shift;
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244 | my $sth = $dbh->prepare("SELECT orgid FROM orgs WHERE orgname=?");
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245 | $sth->execute($org);
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246 | my ($ret) = $sth->fetchrow_array();
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247 | return $ret;
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248 | } # end orgexists();
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249 |
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250 |
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251 | # add a block. requires the orgid
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252 | ##fixme needs error handling
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253 | sub addblock {
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254 | my $self = shift;
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255 | my $blockin = shift;
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256 | my $orgid = shift;
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257 | my $level = shift;
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258 | $blockin =~ s/^\s+//;
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259 | $blockin =~ s/\s+$//;
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260 | my $block = new NetAddr::IP "$blockin"; # need this to clean up messes like ranges. sigh.
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261 |
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262 | return "$blockin not a single CIDR range" if !$block;
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263 |
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264 | # local $dbh->{AutoCommit} = 1; # force autocommit
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265 |
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266 | my $sth;
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267 | eval {
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268 | my $parent = '0/0';
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269 | if ($level > 0) {
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270 | $sth = $dbh->prepare("SELECT block FROM blocks WHERE block >> ? ORDER BY level DESC LIMIT 1");
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271 | $sth->execute("$block");
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272 | ($parent) = $sth->fetchrow_array;
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273 | }
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274 | $sth = $dbh->prepare("INSERT INTO blocks (block,orgid,level,parent,ipcount) VALUES (?,?,?,?,".
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275 | "(SELECT count(*) FROM iplist WHERE ip << ?))");
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276 | $sth->execute("$block",$orgid,$level,$parent,"$block");
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277 | $sth = $dbh->prepare("UPDATE iplist SET parent=? WHERE parent=? AND ip << ?");
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278 | $sth->execute("$block",$parent,"$block");
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279 | $dbh->commit;
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280 | };
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281 | if ($@) {
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282 | my $msg = $@;
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283 | eval { dbh->rollback; };
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284 | return "failed to add $block: $msg";
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285 | }
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286 | # nb: no need to return anything, since the CIDR block is the key
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287 | }
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288 |
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289 |
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290 | sub blockexists {
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291 | my $self = shift;
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292 | my $block = shift;
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293 | my $sth = $dbh->prepare("SELECT count(*) FROM blocks WHERE block=?");
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294 | $sth->execute($block);
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295 | my ($ret) = $sth->fetchrow_array();
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296 | return $ret;
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297 | }
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298 |
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299 |
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300 | # returns list (block,orgname) for the block that contains the passed IP.
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301 | # accepts a level argument if you don't want the top-level registrar allocation block
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302 | sub getcontainer {
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303 | my $self = shift;
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304 | my $ip = shift;
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305 | my $level = shift || 0;
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306 | my $sth = $dbh->prepare("SELECT b.block,o.orgname FROM blocks b INNER JOIN orgs o ".
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307 | "ON b.orgid=o.orgid WHERE b.block >> ? AND b.level = ?");
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308 | $sth->execute($ip,$level);
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309 | return $sth->fetchrow_array();
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310 | } # end getcontainer()
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311 |
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312 |
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313 | # Get info about whether a block, IP or org is listed
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314 | # Returns ?
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315 | sub islisted {
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316 | my $self = shift;
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317 | my $entity = shift;
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318 |
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319 | my $sth;
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320 |
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321 | if ($entity =~ /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/) {
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322 | # looking for IP
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323 |
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324 | $sth = $dbh->prepare("SELECT ip,s4list FROM iplist WHERE ip=?");
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325 | $sth->execute($entity);
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326 | my @ret = $sth->fetchrow_array;
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327 | return @ret if @ret;
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328 |
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329 | } elsif ($entity =~ m|^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/(\d+)$|) {
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330 | # block
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331 |
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332 | my $masklen = $1;
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333 |
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334 | $sth = $dbh->prepare("SELECT block,listme FROM blocks WHERE block=?");
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335 | $sth->execute($entity);
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336 | my ($block,$listme) = $sth->fetchrow_array;
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337 |
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338 | return if !$block;
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339 |
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340 | $sth = $dbh->prepare("SELECT ipcount FROM blocks WHERE block = ?");
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341 | $sth->execute($entity);
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342 | my ($bcount) = $sth->fetchrow_array;
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343 | my @ret = ( ($bcount >= $autolist{$masklen}), $listme);
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344 | return @ret;
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345 |
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346 | } else {
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347 | # org
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348 |
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349 | $sth = $dbh->prepare("SELECT orgid,listme FROM orgs WHERE orgname=?");
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350 | $sth->execute($entity);
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351 | my ($orgid,$listme) = $sth->fetchrow_array;
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352 | return $listme if $orgid;
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353 |
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354 | }
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355 |
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356 | return undef;
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357 |
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358 | } # end islisted()
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359 |
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360 |
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361 | # whee! Recursion is Fun!
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362 | # Call ourself to dig down through the layers of blocks from registar-allocation
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363 | # (level 0) to final block (level n, not to exceed 2)
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364 | # Take a reference to a hash, and stuff it full of blacklisting goodness.
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365 | # Optionally accept a level, block-container, and OOB block and org arguments for
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366 | # the container to check and return
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367 | # Returns no value directly
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368 | # Calls itself to walk down the tree of containers
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369 | sub export {
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370 | my $self = shift;
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371 | my $listhosts = shift;
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372 |
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373 | # Export data as CIDR netblocks or classful (A/B/C) blocks
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374 | # Assume classful as it's more compatible with different DNS servers
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375 | my $mode = shift || 'class';
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376 |
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377 | # Assume we're checking the whole enchilada if we don't get told where to look.
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378 | my $level = shift || 0;
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379 | my $container = shift || '0.0.0.0/0';
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380 | my $bitmask = shift || 0;
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381 |
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382 | if ($level > 3) {
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383 | warn "getting too deep, breaking off! ($container, $level)\n";
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384 | return;
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385 | }
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386 |
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387 | # fiddle $container into a sane state.
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388 | if ($container =~ m|^\d+\.\d+\.\d+/\d+$|) {
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389 | $container =~ s|/(\d+)$|.0/$1|;
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390 | } elsif ($container =~ m|^\d+\.\d+/\d+$|) {
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391 | $container =~ s|/(\d+)$|.0.0/$1|;
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392 | } elsif ($container =~ m|^\d+/(\d+)$|) {
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393 | $container =~ s|/(\d+)$|.0.0.0/$1|;
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394 | }
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395 |
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396 | my $sth = $dbh->prepare("SELECT count(*) FROM blocks WHERE parent = ?");
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397 | $sth->execute($container);
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398 | my ($nblocks) = $sth->fetchrow_array();
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399 |
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400 | # need this for a bunch of things, may as well do it here
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401 | my ($masklen) = ($container =~ m|/(\d+)$|);
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402 |
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403 | # Update the bitmask variable with the current block info as needed.
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404 | # Much faster than retrieving this data later (~3x faster!).
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405 | my $listme;
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406 | my $listorg;
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407 | my $bcount;
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408 | if ($container ne '0.0.0.0/0') {
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409 | $sth = $dbh->prepare("SELECT b.ipcount,b.listme,o.listme ".
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410 | "FROM blocks b INNER JOIN orgs o ON b.orgid=o.orgid ".
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411 | "WHERE b.block = ?");
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412 | $sth->execute($container);
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413 | ($bcount,$listme,$listorg) = $sth->fetchrow_array();
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414 |
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415 | $bitmask |= $bitfields{$level-1} if $bcount >= $autolist{$masklen};
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416 | $bitmask |= $bitfields{"block".($level-1)} if $listme;
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417 | $bitmask |= $bitfields{"org".($level-1)} if $listorg;
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418 | }
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419 |
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420 | # hm. can't seem to move this prepare elsewhere. :(
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421 | if ($nblocks > 0) {
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422 | my $sthsubblocks = $dbh->prepare("SELECT block FROM blocks ".
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423 | "WHERE level = ? AND parent = ?");
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424 | $sthsubblocks->execute($level, $container);
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425 | while (my ($cidr) = $sthsubblocks->fetchrow_array()) {
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426 | $self->export($listhosts,$mode,$level+1,$cidr,$bitmask);
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427 | }
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428 | } # avoid checking content of subs if we don't have any
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429 |
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430 | # don't check all 4.2 billion IPs individually if we're looking at all teh Intarwebs
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431 | return if $container eq '0.0.0.0/0';
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432 |
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433 | ##fixme: need a way to dig out orphan IPs at all levels - IPs not found in a
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434 | # subblock of the current container when the current container *has* subblocks
|
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435 | # NB: this may be better handled as an out-of-band data-integrity-checker
|
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436 |
|
---|
437 | # decrement level here so the right bitfield setting gets picked. this segment
|
---|
438 | # is inherently off-by-one from the block-recursion loop, and I can't see a
|
---|
439 | # better way to work around that. >:(
|
---|
440 | $level--;
|
---|
441 |
|
---|
442 | if ($mode eq 'cidr') {
|
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443 | $listhosts->{$container} |= $bitmask if $bitmask && ($listme || $listorg || ($bcount >= $autolist{$masklen}));
|
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444 | } else {
|
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445 | # if $cidr->masklen is <= 24, iterate on /24 boundaries for bulk sublisting
|
---|
446 | # if $cidr->masklen is <= 16, iterate on /16 boundaries for bulk sublisting
|
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447 | # if $cidr->masklen is <= 8, iterate on /8 boundaries for bulk sublisting
|
---|
448 |
|
---|
449 | if ($bitmask) {
|
---|
450 | my @blocksubs;
|
---|
451 | if ($masklen <= 30 && $masklen > 24) {
|
---|
452 | my ($net,$octet) = ($container =~ m|^(\d+\.\d+\.\d+\.)(\d+)/|);
|
---|
453 | for (my $entry = $octet; $entry < ($octet + $howmany[$masklen]); $entry++) {
|
---|
454 | my $host = "$net$entry";
|
---|
455 | $listhosts->{$host} = 0 if !defined($listhosts->{$host});
|
---|
456 | $listhosts->{$host} |= $bitmask;
|
---|
457 | }
|
---|
458 | } elsif ($masklen <= 24 && $masklen > 16) {
|
---|
459 | my ($net,$octet) = ($container =~ m|^(\d+\.\d+\.)(\d+)\.\d+/|);
|
---|
460 | for (my $entry = $octet; $entry < ($octet + $howmany[$masklen]); $entry++) {
|
---|
461 | my $twofour = "$net$entry.*";
|
---|
462 | $listhosts->{$twofour} |= $bitmask;
|
---|
463 | }
|
---|
464 | } elsif ($masklen <= 16 && $masklen > 8) {
|
---|
465 | my ($net,$octet) = ($container =~ m|^(\d+\.)(\d+)\.\d+\.\d+/|);
|
---|
466 | for (my $entry = $octet; $entry < ($octet + $howmany[$masklen]); $entry++) {
|
---|
467 | my $sixteen = "$net$entry.*";
|
---|
468 | $listhosts->{$sixteen} |= $bitmask;
|
---|
469 | }
|
---|
470 | } elsif ($masklen <= 8) {
|
---|
471 | my ($octet) = ($container =~ m|^(\d+)\.\d+\.\d+\.\d+/|);
|
---|
472 | for (my $entry = $octet; $entry < ($octet + $howmany[$masklen]); $entry++) {
|
---|
473 | my $eight = "$entry.*";
|
---|
474 | $listhosts->{$eight} |= $bitmask;
|
---|
475 | }
|
---|
476 | }
|
---|
477 |
|
---|
478 | } # generate autolist entries for ips/octets not (yet) seen in reports
|
---|
479 |
|
---|
480 | } # cidr vs classful mode
|
---|
481 |
|
---|
482 | $sthmoron->execute($container);
|
---|
483 | while (my ($ip,$moron) = $sthmoron->fetchrow_array()) {
|
---|
484 | $listhosts->{$ip} |= $bitmask;
|
---|
485 | if ($moron) {
|
---|
486 | $listhosts->{$ip} = $bitfields{slist};
|
---|
487 | } else {
|
---|
488 | $listhosts->{$ip} |= $bitfields{ip};
|
---|
489 | }
|
---|
490 | }
|
---|
491 |
|
---|
492 | # get IPs which for reasons unknown are apparently allocated directly from the
|
---|
493 | # parent registry (and so do not have containing netblocks in this system) O_o
|
---|
494 | # select * from iplist where not (select count(*) from blocks where ip << block) > 0;
|
---|
495 |
|
---|
496 | return;
|
---|
497 | } # end export()
|
---|
498 |
|
---|
499 |
|
---|
500 | sub export_alt {
|
---|
501 | my $self = shift;
|
---|
502 | my $listhosts = shift;
|
---|
503 | my $level = shift || 0;
|
---|
504 | my $container = shift || '0.0.0.0/0';
|
---|
505 | my $oobblock = shift || 0;
|
---|
506 | my $ooborg = shift || 0;
|
---|
507 |
|
---|
508 | #print "\nDEBUG: called with $level, $container, $oobblock, $ooborg\n";
|
---|
509 | # if $level > 2 or $container =~ /^64\.76\./;
|
---|
510 | # my %listhosts;
|
---|
511 |
|
---|
512 | # $level = 0 if !$level;
|
---|
513 | if ($level > 3) {
|
---|
514 | warn "getting too deep, breaking off!\n";
|
---|
515 | return;
|
---|
516 | }
|
---|
517 |
|
---|
518 | my $sth = $dbh->prepare("select ip,s4list from iplist order by ip");
|
---|
519 | my $bsth = $dbh->prepare("select b.block,b.listme,b.level,o.listme ".
|
---|
520 | "from blocks b inner join orgs o on b.orgid=o.orgid ".
|
---|
521 | "where b.block >> ?");
|
---|
522 | while (my ($ip,$s4list) = $sth->fetchrow_array) {
|
---|
523 | $bsth->execute($ip);
|
---|
524 | while (my ($block,$blisted,$blevel,$olisted) = $bsth->fetchrow_array) {
|
---|
525 | $listhosts->{$ip} |= 0;
|
---|
526 | }
|
---|
527 | }
|
---|
528 |
|
---|
529 | } # end export_alt()
|
---|
530 |
|
---|
531 |
|
---|
532 | ## DNSBL::autolist_block()
|
---|
533 | # check if a block should be autolisted
|
---|
534 | sub autolist_block {
|
---|
535 | my $self = shift;
|
---|
536 | my $block = shift;
|
---|
537 |
|
---|
538 | my $cidr = new NetAddr::IP "$block";
|
---|
539 | my $sth = $dbh->prepare("SELECT ipcount FROM blocks WHERE block = ?");
|
---|
540 | $sth->execute("$cidr");
|
---|
541 | my ($count) = $sth->fetchrow_array;
|
---|
542 |
|
---|
543 | return 1 if $count >= $autolist{$cidr->masklen};
|
---|
544 | return 0;
|
---|
545 | } # end autolist_block()
|
---|
546 |
|
---|
547 |
|
---|
548 | # make Perl happy
|
---|
549 | 1;
|
---|