annotate xml/dnsbl.in @ 263:e118fd2c6af0

fix unauthenticated rate limit bug for empty mail from; move unauthenticate rate limit checks after spam filtering
author Carl Byington <carl@five-ten-sg.com>
date Sat, 21 Jul 2012 12:35:19 -0700
parents 92a98e661a0b
children f941563c2a95
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1 <reference>
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2 <title>@PACKAGE@ Sendmail milter - Version @VERSION@</title>
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3 <partintro>
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4 <title>Packages</title>
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5
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6 <para>The various source and binary packages are available at <ulink
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7 url="http://www.five-ten-sg.com/@PACKAGE@/packages/">http://www.five-ten-sg.com/@PACKAGE@/packages/</ulink>.
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8 The most recent documentation is available at <ulink
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9 url="http://www.five-ten-sg.com/@PACKAGE@/">http://www.five-ten-sg.com/@PACKAGE@/</ulink>.
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10 </para>
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11
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12 <para>A <ulink
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13 url="http://www.selenic.com/mercurial/wiki/">Mercurial</ulink> source
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14 code repository for this project is available at <ulink
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15 url="http://hg.five-ten-sg.com/@PACKAGE@/">http://hg.five-ten-sg.com/@PACKAGE@/</ulink>.
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16 </para>
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17
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18 </partintro>
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19
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20 <refentry id="@PACKAGE@.1">
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21 <refentryinfo>
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22 <date>2012-07-21</date>
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23 <author>
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24 <firstname>Carl</firstname>
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25 <surname>Byington</surname>
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26 <affiliation><orgname>510 Software Group</orgname></affiliation>
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27 </author>
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28 </refentryinfo>
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29
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30 <refmeta>
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31 <refentrytitle>@PACKAGE@</refentrytitle>
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32 <manvolnum>1</manvolnum>
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33 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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34 </refmeta>
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35
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36 <refnamediv id='name.1'>
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37 <refname>@PACKAGE@</refname>
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38 <refpurpose>a sendmail milter with per-user dnsbl filtering</refpurpose>
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39 </refnamediv>
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40
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41 <refsynopsisdiv id='synopsis.1'>
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42 <title>Synopsis</title>
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43 <cmdsynopsis>
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44 <command>@PACKAGE@</command>
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45 <arg><option>-c</option></arg>
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46 <arg><option>-s</option></arg>
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47 <arg><option>-d <replaceable class="parameter">n</replaceable></option></arg>
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48 <arg><option>-e <replaceable class="parameter">from|to</replaceable></option></arg>
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49 <arg><option>-b <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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50 <arg><option>-r <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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51 <arg><option>-p <replaceable class="parameter">sendmail-socket</replaceable></option></arg>
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52 <arg><option>-t <replaceable class="parameter">timeout</replaceable></option></arg>
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53 </cmdsynopsis>
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54 </refsynopsisdiv>
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55
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56 <refsect1 id='options.1'>
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57 <title>Options</title>
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58 <variablelist>
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59 <varlistentry>
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60 <term>-c</term>
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61 <listitem><para>
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62 Load the configuration file, print a cannonical form
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63 of the configuration on stdout, and exit.
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64 </para></listitem>
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65 </varlistentry>
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66 <varlistentry>
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67 <term>-s</term>
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68 <listitem><para>
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69 Stress test the configuration loading code by repeating
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70 the load/free cycle in an infinite loop.
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71 </para></listitem>
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72 </varlistentry>
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73 <varlistentry>
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74 <term>-d <replaceable class="parameter">n</replaceable></term>
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75 <listitem><para>
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76 Set the debug level to <replaceable class="parameter">n</replaceable>.
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77 </para></listitem>
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78 </varlistentry>
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79 <varlistentry>
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80 <term>-e <replaceable class="parameter">from|to</replaceable></term>
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81 <listitem><para>
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82 Print the results of looking up the from and to addresses in the
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83 current configuration. The | character is used to separate the from and to
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84 addresses in the argument to the -e switch.
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85 </para></listitem>
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86 </varlistentry>
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87 <varlistentry>
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88 <term>-b <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
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89 <listitem><para>
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90 Set the local socket used for the connection to the dccifd daemon.
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91 This is typically /var/dcc/dccifd.
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92 </para></listitem>
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93 </varlistentry>
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94 <varlistentry>
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95 <term>-r <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
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96 <listitem><para>
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97 Set the local socket used for the connection to our own dns resolver processes.
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98 </para></listitem>
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99 </varlistentry>
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100 <varlistentry>
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101 <term>-p <replaceable class="parameter">sendmail-socket</replaceable></term>
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102 <listitem><para>
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103 Set the socket used for the milter connection to sendmail. This is either
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104 "inet:port@ip-address" or "local:local-domain-socket-file-name".
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105 </para></listitem>
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106 </varlistentry>
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107 <varlistentry>
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108 <term>-t <replaceable class="parameter">timeout</replaceable></term>
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109 <listitem><para>
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110 Set the timeout in seconds used for communication with sendmail.
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111 </para></listitem>
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112 </varlistentry>
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113 </variablelist>
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114 </refsect1>
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115
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116 <refsect1 id='usage.1'>
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117 <title>Usage</title>
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118 <para><command>@PACKAGE@</command> -c</para>
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119 <para><command>@PACKAGE@</command> -s</para>
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120 <para><command>@PACKAGE@</command> -e 'someone@aol.com|localname@mydomain.tld'</para>
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121 <para><command>@PACKAGE@</command> -d 10 -r resolver.sock -p local:dnsbl.sock</para>
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122 </refsect1>
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123
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124 <refsect1 id='installation.1'>
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125 <title>Installation</title>
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126 <para>
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127 This is now a standard GNU autoconf/automake installation, so the normal
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128 "./configure; make; su; make install" works. "make chkconfig" will
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129 setup the init.d runlevel scripts. Alternatively, you can use the
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130 source or binary RPMs at <ulink
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131 url="http://www.five-ten-sg.com/@PACKAGE@/packages">http://www.five-ten-sg.com/@PACKAGE@/packages</ulink>.
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132 </para>
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133 <para>
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134 Note that this has ONLY been tested on Linux, specifically RedHat Linux.
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135 In particular, this milter makes no attempt to understand IPv6. Your
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136 mileage will vary. You will need at a minimum a C++ compiler with a
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137 minimally thread safe STL implementation. The distribution includes a
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138 test.cpp program. If it fails this milter won't work. If it passes,
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139 this milter might work.
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140 </para>
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141 <para>
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142 Modify your sendmail.mc by removing all the "FEATURE(dnsbl" lines, add
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143 the following line in your sendmail.mc and rebuild the .cf file
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144 </para>
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145 <para><screen>INPUT_MAIL_FILTER(`dnsbl', `S=local:/var/run/dnsbl/dnsbl.sock, F=T, T=C:30s;S:5m;R:5m;E:5m')</screen></para>
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146 <para>
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147 Modify the default <citerefentry>
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148 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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149 </citerefentry> configuration.
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150 </para>
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151 </refsect1>
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152
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153 <refsect1 id='configuration.1'>
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154 <title>Configuration</title>
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155 <para>
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156 The configuration file is documented in <citerefentry>
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157 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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158 </citerefentry>. Any change to the config file, or any file included
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159 from that config file, will cause it to be reloaded within three
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160 minutes.
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161 </para>
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162 </refsect1>
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164 <refsect1 id='introduction.1'>
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165 <title>Introduction</title>
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166 <para>
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167 Consider the case of a mail server that is acting as secondary MX for a
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168 collection of clients, each of which has a collection of mail domains.
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169 Each client may use their own collection of DNSBLs on their primary mail
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170 server. We present here a mechanism whereby the backup mail server can
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171 use the correct set of DNSBLs for each recipient for each message. As a
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172 side-effect, it gives us the ability to customize the set of DNSBLs on a
183
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173 per-recipient basis, so that fred@example.com could use LOCAL and the
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174 SBL, where all other users @example.com use only the SBL.
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175 </para>
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176 <para>
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177 This milter can also verify the envelope from/recipient pairs with the
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178 primary MX server. This allows the backup mail servers to properly
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179 reject mail sent to invalid addresses. Otherwise, the backup mail
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180 servers will accept that mail, and then generate a bounce message when
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181 the message is forwarded to the primary server (and rejected there with
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182 no such user). These rejections are the primary cause of such backscatter.
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183 </para>
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184 <para>
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185 This milter will also decode (uuencode, base64, mime, html entity, url
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186 encodings) and scan for HTTP and HTTPS URLs and bare hostnames in the
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187 body of the mail. If any of those host names have A or NS records on
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188 the SBL (or a single configurable DNSBL), the mail will be rejected
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189 unless previously whitelisted. This milter also counts the number of
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190 invalid HTML tags, and can reject mail if that count exceeds your
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191 specified limit.
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192 </para>
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193 <para>
259
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194 This milter can also impose hourly and daily rate
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195 limits on the number of recipients accepted from SMTP
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196 AUTH connections, that would otherwise be allowed to
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197 relay thru this mail server with no spam filtering. If
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198 the connection does not use SMTP AUTH, the rate limits
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199 may be specified by the mail from email address or
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200 domain.
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201 </para>
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202 <para>
162
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203 Consider the case of a message from A to B passing thru this milter. If
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204 that message is not blocked, then we might eventually see a reply
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205 message from B to A. If the filtering context for A includes an
162
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206 autowhite entry, and that context does <emphasis>not</emphasis> cover B
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207 as a recipient, then this milter will add an entry in that file to
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208 whitelist such replies for a configurable time period. Suppose A and B
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209 are in the same domain, or at least use the same filtering context. In
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210 that case we don't want to add a whitelist entry for B, since that would
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211 then allow spammers to send mail from B (forged) to B. Such autowhite
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212 files need to be writeable by the dnsbl user, where all the other dnsbl
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213 configuration files only need to be readable by the dnsbl user.
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214 </para>
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215 <para>
176
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216 You can manually add such an autowhite entry, by appending a single
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217 text line to the autowhitelist file, using something like
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218 <command>echo "$mail 0" >>$autowhitefile</command>.
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219 You can manually remove such an autowhite entry, by appending a single
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220 text line to the autowhitelist file, using something like
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221 <command>echo "$mail 1" >>$autowhitefile</command>.
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222 </para>
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223 <para>
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224 The DNSBL milter reads a text configuration file (dnsbl.conf) on
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225 startup, and whenever the config file (or any of the referenced include
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226 files) is changed. The entire configuration file is case insensitive.
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227 If the configuration cannot be loaded due to a syntax error, the milter
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228 will log the error and quit. If the configuration cannot be reloaded
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229 after being modified, the milter will log the error and send an email to
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230 root from dnsbl@$hostname. You probably want to add dnsbl@$hostname
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231 to your /etc/mail/virtusertable since otherwise sendmail will reject
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232 that message.
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233 </para>
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234 </refsect1>
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235
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236 <refsect1 id='dcc.1'>
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237 <title>DCC Issues</title>
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238 <para>
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239 If you are also using the <ulink
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240 url="http://www.rhyolite.com/anti-spam/dcc/">DCC</ulink> milter, there
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241 are a few considerations. You may need to whitelist senders from the
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242 DCC bulk detector, or from the DNS based lists. Those are two very
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243 different reasons for whitelisting. The former is done thru the DCC
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244 whiteclnt config file, the later is done thru the DNSBL milter config
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245 file.
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246 </para>
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247 <para>
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248 You may want to blacklist some specific senders or sending domains.
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249 This could be done thru either the DCC (on a global basis, or for a
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250 specific single recipient). We prefer to do such blacklisting via the
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251 DNSBL milter config, since it can be done for a collection of recipient
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252 mail domains. The DCC approach has the feature that you can capture the
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253 entire message in the DCC log files. The DNSBL milter approach has the
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254 feature that the mail is rejected earlier (at RCPT TO time), and the
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255 sending machine just gets a generic "550 5.7.1 no such user" message.
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256 </para>
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257 <para>
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258 The DCC whiteclnt file can be included in the DNSBL milter config by the
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259 dcc_to and dcc_from statements. This will import the (env_to, env_from,
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260 and substitute mail_host) entries from the DCC config into the DNSBL
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261 config. This allows using the DCC config as the single point for
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262 white/blacklisting.
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263 </para>
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264 <para>
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265 Consider the case where you have multiple clients, each with their own
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266 mail servers, and each running their own DCC milters. Each client is
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267 using the DCC facilities for envelope from/to white/blacklisting.
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268 Presumably you can use rsync or scp to fetch copies of your clients DCC
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269 whiteclnt files on a regular basis. Your mail server, acting as a
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270 backup MX for your clients, can use the DNSBL milter, and include those
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271 client DCC config files. The envelope from/to white/blacklisting will
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272 be appropriately tagged and used only for the domains controlled by each
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273 of those clients.
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274 </para>
179
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275 <para>
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276 You can now use (via dccifd) different dcc filtering parameters on a per
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277 context basis. See the dcc_greylist and dcc_bulk_threshold statements
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278 in the <citerefentry> <refentrytitle>@PACKAGE@.conf</refentrytitle>
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279 <manvolnum>5</manvolnum> </citerefentry> configuration. Those
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280 statements are only active if you supply the <option>-b</option> option
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281 on the dnsbl command line. If you use the dcc via the standard dcc
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282 milter (dccm), then connections from clients that use SMTP AUTH are
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283 still subject to greylisting. If you use the dcc via dccifd and this
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284 milter, then connections from clients that use SMTP AUTH are never
180
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285 subject to greylisting. As part of this per-user greylisting, you need
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286 to move the dnsblnogrey file from the config directory to something
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287 like /var/dcc/userdirs/local/dnsblnogrey/whiteclnt so the dccifd will
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288 properly ignore greylisting for those recipients that don't want it.
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289 </para>
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290 </refsect1>
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291
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292 <refsect1 id='definitions.1'>
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293 <title>Definitions</title>
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294 <para>
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295 CONTEXT - a collection of parameters that defines the filtering context
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296 to be used for a collection of envelope recipient addresses. The
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297 context includes such things as the list of DNSBLs to be used, and the
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298 various content filtering parameters.
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299 </para>
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300 <para>
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301 DNSBL - a named DNS based blocking list is defined by a dns suffix (e.g.
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302 sbl-xbl.spamhaus.org) and a message string that is used to generate the
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303 "550 5.7.1" smtp error return code. The names of these DNSBLs will be
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304 used to define the DNSBL-LISTs.
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305 </para>
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306 <para>
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307 DNSBL-LIST - a named list of DNSBLs that will be used for specific
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308 recipients or recipient domains.
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309 </para>
249
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310 <para>
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311 DNSWL - a named DNS based white list is defined by a dns suffix (e.g.
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312 list.dnswl.org) and an integer level. If the level is greater than or
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313 equal to x in the 127.0.z.x return code from the white list, then the
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314 ip address is considered to match, and the message will be whitelisted.
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315 The names of these DNSWLs will be used to define the DNSWL-LISTs.
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316 </para>
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317 <para>
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318 DNSWL-LIST - a named list of DNSWLs that will be used for specific
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319 recipients or recipient domains.
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320 </para>
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321 </refsect1>
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322
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323 <refsect1 id='filtering.1'>
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324 <title>Filtering Procedure</title>
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325 <para>
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326 The SMTP envelope 'from' and 'to' values are used in various checks.
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327 The first check is to see if a reply message (swapping the env_from and
160
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328 env_to values) would be unconditionally blocked (just based on the
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329 envelope from address). That check is similar to the main check
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330 described below, but there is no body content to be scanned, and there
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diff changeset
331 is no client connection ip address to be checked against DNSBLs. If
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diff changeset
332 such a reply message would be blocked, we also block the original
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333 outgoing message. This prevents folks from sending mail to recipients
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334 that are unable to reply.
152
c7fc218686f5 gpl3, block mail to recipients that cannot reply
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335 </para>
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336 <para>
136
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337 If the client has authenticated with sendmail, the rate limits are
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338 checked. If the authenticated user has not exceeded the hourly rate
144
31ff00ea6bfb allow parent/child to share a fully qualified env_to address
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339 limit, then the mail is accepted, the filtering contexts are not used,
136
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340 the dns lists are not checked, and the body content is not scanned. If
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341 the client has not authenticated with sendmail, we follow these steps
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342 for each recipient.
108
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343 </para>
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344 <orderedlist>
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345 <listitem><para>
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346 The envelope to email address is used to find an initial filtering
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347 context. We first look for a context that specified the full email
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348 address in the env_to statement. If that is not found, we look for a
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349 context that specified the entire domain name of the envelope recipient
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350 in the env_to statement. If that is not found, we look for a context
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351 that specified the user@ part of the envelope recipient in the env_to
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352 statement. If that is not found, we use the first top level context
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353 defined in the config file.
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354 </para></listitem>
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355 <listitem><para>
108
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356 The initial filtering context may redirect to a child context based on
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357 the values in the initial context's env_from statement. We look for [1)
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358 the full envelope from email address, 2) the domain name part of the
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359 envelope from address, 3) the user@ part of the envelope from address]
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360 in that context's env_from statement, with values that point to a child
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361 context. If such an entry is found, we switch to that child filtering
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362 context.
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363 </para></listitem>
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364 <listitem><para>
108
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365 We lookup [1) the full envelope from email address, 2) the domain name
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366 part of the envelope from address, 3) the user@ part of the envelope
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367 from address] in the filtering context env_from statement. That results
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368 in one of (white, black, unknown, inherit).
111
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369 </para></listitem>
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370 <listitem><para>
108
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371 If the answer is black, mail to this recipient is rejected with "no such
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372 user", and the dns lists are not checked.
111
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373 </para></listitem>
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374 <listitem><para>
108
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375 If the answer is white, mail to this recipient is accepted and the dns
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376 lists are not checked.
111
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377 </para></listitem>
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diff changeset
378 <listitem><para>
108
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379 If the answer is unknown, we don't reject yet, but the dns lists will be
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diff changeset
380 checked, and the content may be scanned.
111
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diff changeset
381 </para></listitem>
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diff changeset
382 <listitem><para>
108
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383 If the answer is inherit, we repeat the envelope from search in the
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384 parent context.
111
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385 </para></listitem>
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386 <listitem><para>
233
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parents: 216
diff changeset
387 If the mail has not been accepted or rejected yet, and the filtering
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
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parents: 216
diff changeset
388 context (or any ancestor context) specifies a non-empty whitelist regular
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
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parents: 216
diff changeset
389 expression, then we check the envelope from value against that regex.
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
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parents: 216
diff changeset
390 The mail is accepted if the envelope from value matches the specified regular
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
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parents: 216
diff changeset
391 expression.
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
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parents: 216
diff changeset
392 </para></listitem>
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
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parents: 216
diff changeset
393 <listitem><para>
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
394 If the mail has not been accepted or rejected yet, the dns white lists
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
395 specified in the filtering context are checked and the mail is accepted
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
396 if any list has an A record for the standard dns based lookup scheme
15bf4f68a0b2 Add dnswl support
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parents: 246
diff changeset
397 (reversed octets of the client followed by the dns suffix) with a final
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
398 octet greater than or equal to the level specified for that dnswl.
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
399 </para></listitem>
15bf4f68a0b2 Add dnswl support
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parents: 246
diff changeset
400 <listitem><para>
15bf4f68a0b2 Add dnswl support
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parents: 246
diff changeset
401 If the mail has not been accepted or rejected yet, the dns black lists
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
402 specified in the filtering context are checked and the mail is rejected
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
403 if any list has an A record for the standard dns based lookup scheme
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
404 (reversed octets of the client followed by the dns suffix).
6bac960af6b4 add generic reverse dns filtering regex
carl
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diff changeset
405 </para></listitem>
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
406 <listitem><para>
6bac960af6b4 add generic reverse dns filtering regex
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parents: 167
diff changeset
407 If the mail has not been accepted or rejected yet, and the filtering
170
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
408 context (or any ancestor context) specifies a non-empty generic regular
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
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diff changeset
409 expression, then we check the fully qualified client name (obtained via
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
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410 the sendmail macro "_"). The mail is rejected if the client name
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
411 matches the specified regular expression.
111
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parents: 108
diff changeset
412 </para></listitem>
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parents: 108
diff changeset
413 <listitem><para>
108
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parents: 104
diff changeset
414 If the mail has not been accepted or rejected yet, we look for a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
415 verification context, which is the closest ancestor of the filtering
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
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416 context that both specifies a verification host, and which covers the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
417 envelope to address. If we find such a verification context, and the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
418 verification host is not our own hostname, we open an smtp conversation
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
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419 with that verification host. The current envelope from and recipient to
1c7677042b78 move to autoconf/automake/docbook
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420 values are passed to that verification host. If we receive a 5xy
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
421 response those commands, we reject the current recipient with "no such
1c7677042b78 move to autoconf/automake/docbook
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parents: 104
diff changeset
422 user".
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423 </para></listitem>
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diff changeset
424 <listitem><para>
108
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parents: 104
diff changeset
425 If the mail has not been accepted or rejected yet, and the filtering
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
426 context enables content filtering, and this is the first such recipient
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
427 in this smtp transaction, we set the content filtering parameters from
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carl
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diff changeset
428 this context, and enable content filtering for the body of this message.
111
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diff changeset
429 </para></listitem>
108
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430 </orderedlist>
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431 <para>
160
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432 For each recipient that was accepted, we search for an autowhite entry
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
433 starting in the reply filtering context. If an autowhite entry is found,
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
434 we add the recipient to that auto whitelist file. This will prevent reply
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
435 messages from being blocked by the dnsbl or content filtering.
b3ed72ee6564 allow manual updates to auto whitelist files
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diff changeset
436 </para>
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diff changeset
437 <para>
108
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parents: 104
diff changeset
438 If content filtering is enabled for this body, the mail text is decoded
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
439 (uuencode, base64, mime, html entity, url encodings), and scanned for HTTP
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
440 and HTTPS URLs or bare host names. Hostnames must be either ip address
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
441 literals, or must end in a string defined by the TLD list. The first
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
442 &lt;configurable&gt; host names are checked as follows.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
443 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
444 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
445 The only known list that is suitable for the content filter DNSBL is the
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
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446 SBL. If the content filter DNSBL is defined, and any of those host
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
447 names resolve to ip addresses that are on that DNSBL (or have
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
448 nameservers that are on that list), and the host name is not on the
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
449 &lt;configurable&gt; ignore list, the mail is rejected.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
450 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
451 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
452 If the content uribl DNSBL is defined, and any of those host names are
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
453 on that DNSBL, and the host name is not on the &lt;configurable&gt;
249
15bf4f68a0b2 Add dnswl support
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parents: 246
diff changeset
454 ignore list, the mail is rejected. Note that the Spamhaus DBL is not (yet)
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
455 suitable here, since we currently pass ip addresses to the uribl checker,
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
456 and the DBL lists all such bare ip addresses.
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
457 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
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diff changeset
458 <para>
167
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diff changeset
459 If any non-whitelisted recipient has a filtering context with a non-zero
9b129ed78d7d actually use spamassassin result, allow build without spam assassin, only call it if some recipient needs it.
carl
parents: 164
diff changeset
460 spamassassin limit, then the message is passed thru spamassassin (via
9b129ed78d7d actually use spamassassin result, allow build without spam assassin, only call it if some recipient needs it.
carl
parents: 164
diff changeset
461 spamc), and the message is rejected for those recipients with spamassassin
203
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
462 limits less than the resulting spamassassin score. For example, a
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
463 spamassassin limit of three will reject messages with spamassassin scores
246
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parents: 233
diff changeset
464 of four or greater. If the filtering context has a spamassassin limit of
8b0f16abee53 Add prvs decoding to envelope addresses
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parents: 233
diff changeset
465 zero, then spamassassin is not called (or if called the results are not used)
8b0f16abee53 Add prvs decoding to envelope addresses
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parents: 233
diff changeset
466 for this recipient.
203
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
467 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
468 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
469 If any non-whitelisted recipient has a filtering context that specifies
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
470 DCC greylisting, then the message is passed thru the DCC bulk detector,
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
471 and the message is greylisted (for all recipients) if the DCC says this
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
472 message should be delayed.
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
473 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
474 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
475 If any non-whitelisted recipient has a filtering context with a non-zero
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
476 DCC bulk threshold, then the message is passed thru the DCC bulk detector,
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
477 and the message is rejected for those recipients with DCC thresholds less
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
478 than or equal to the DCC bulk score.
163
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carl
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diff changeset
479 </para>
97d7da45fe2a spamassassin changes
carl
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diff changeset
480 <para>
119
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carl
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diff changeset
481 We also scan for excessive bad html tags, and if a &lt;configurable&gt;
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
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diff changeset
482 limit is exceeded, the mail is rejected.
108
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parents: 104
diff changeset
483 </para>
1c7677042b78 move to autoconf/automake/docbook
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parents: 104
diff changeset
484 </refsect1>
94
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485
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486 <refsect1 id='access.1'>
108
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487 <title>Sendmail access vs. DNSBL</title>
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488 <para>
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489 With the standard sendmail.mc dnsbl FEATURE, the dnsbl checks may be
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490 suppressed by entries in the /etc/mail/access database. For example,
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491 suppose you control a /18 of address space, and have allocated some /24s
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492 to some clients. You have access entries like
111
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493 <literallayout class="monospaced"><![CDATA[
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494 192.168.4 OK
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495 192.168.17 OK]]></literallayout>
108
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496 </para>
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497 <para>
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498 to allow those clients to smarthost thru your mail server. Now if one
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499 of those clients happens get infected with a virus that turns a machine
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500 into an open proxy, and their 192.168.4.45 lands on the SBL-XBL, you
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501 will still wind up allowing that infected machine to smarthost thru your
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502 mail servers.
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503 </para>
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504 <para>
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505 With this DNSBL milter, the sendmail access database cannot override the
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506 dnsbl checks, so that machine won't be able to send mail to or thru your
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507 smarthost mail server (unless the virus/proxy can use smtp-auth).
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508 </para>
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509 <para>
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510 Using the standard sendmail features, you would add access entries to
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511 allow hosts on your local network to relay thru your mail server. Those
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512 OK entries in the sendmail access database will override all the dnsbl
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513 checks. With this DNSBL milter, you will need to have the local users
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514 authenticate with smtp-auth to get the same effect. You might find
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515 <ulink
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516 url="http://www.ists.dartmouth.edu/classroom/sendmail-ssl-how-to.php">
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517 these directions</ulink> helpful for setting up smtp-auth if you are on
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518 RH Linux.
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519 </para>
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520 </refsect1>
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521
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522 <refsect1 id='performance.1'>
108
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523 <title>Performance Issues</title>
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524 <para>
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525 Consider a high volume high performance machine running sendmail. Each
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carl
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526 sendmail process can do its own dns resolution. Typically, such dns
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carl
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diff changeset
527 resolver libraries are not thread safe, and so must be protected by some
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diff changeset
528 sort of mutex in a threaded environment. When we add a milter to
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carl
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529 sendmail, we now have a collection of sendmail processes, and a
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530 collection of milter threads.
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531 </para>
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532 <para>
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diff changeset
533 We will be doing a lot of dns lookups per mail message, and at least
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carl
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534 some of those will take many tens of seconds. If all this dns work is
1c7677042b78 move to autoconf/automake/docbook
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diff changeset
535 serialized inside the milter, we have an upper limit of about 25K mail
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carl
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diff changeset
536 messages per day. That is clearly not sufficient for many sites.
1c7677042b78 move to autoconf/automake/docbook
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537 </para>
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diff changeset
538 <para>
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diff changeset
539 Since we want to do parallel dns resolution across those milter threads,
1c7677042b78 move to autoconf/automake/docbook
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540 we add another collection of dns resolver processes. Each sendmail
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diff changeset
541 process is talking to a milter thread over a socket, and each milter
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542 thread is talking to a dns resolver process over another socket.
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543 </para>
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544 <para>
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diff changeset
545 Suppose we are processing 20 messages per second, and each message
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diff changeset
546 requires 20 seconds of dns work. Then we will have 400 sendmail
1c7677042b78 move to autoconf/automake/docbook
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diff changeset
547 processes, 400 milter threads, and 400 dns resolver processes. Of
1c7677042b78 move to autoconf/automake/docbook
carl
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diff changeset
548 course that steady state is very unlikely to happen.
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549 </para>
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550 </refsect1>
94
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551
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552
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553 <refsect1 id='rejected.1'>
108
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diff changeset
554 <title>Rejected Ideas</title>
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parents: 104
diff changeset
555 <para>
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556 The following ideas have been considered and rejected.
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diff changeset
557 </para>
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diff changeset
558 <para>
111
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diff changeset
559 Add max_recipients setting to the context configuration. Recipients in
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diff changeset
560 excess of that limit will be rejected, and all the non-whitelisted
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561 recipients will be removed. Current spammers *very* rarely send more
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562 than ten recipients in a single smtp transaction, so this won't stop any
108
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563 significant amount of spam.
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564 </para>
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565 <para>
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566 Add poison addresses to the configuration. If any recipient is
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567 poison, all recipients are rejected even if they would be whitelisted,
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568 and the data is rejected if sent. I have a collection of spam trap
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569 addresses that would be suitable for such use. Based on my log files,
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diff changeset
570 any mail to those spam trap addresses is rejected based on either dnsbl
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571 lookups or the DCC. So this won't result in blocking any additional
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572 spam.
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573 </para>
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574 <para>
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575 Add an option to only allow one recipient if the return path is
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576 empty. Based on my log files, there is no mail that violates this
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577 check.
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578 </para>
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579 <para>
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580 Reject the mail if the envelope from domain name contains any MX
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diff changeset
581 records pointing to 127.0.0.0/8. I don't see any significant amount of
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582 spam sent with such domain names.
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583 </para>
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584 </refsect1>
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585
108
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diff changeset
586 <refsect1 id='todo.1'>
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587 <title>TODO</title>
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588 <para>
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589 The following ideas are under consideration.
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590 </para>
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591 <para>
115
07e5d4721213 use larger resolver buffer
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592 Look for href="hostname/path" strings that are missing the required
07e5d4721213 use larger resolver buffer
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diff changeset
593 http:// protocol header. Such references are still clickable in common
07e5d4721213 use larger resolver buffer
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594 mail software.
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595 </para>
249
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596 <para>
15bf4f68a0b2 Add dnswl support
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597 Add the ability to use the DBL for content filtering. We need to avoid
15bf4f68a0b2 Add dnswl support
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diff changeset
598 checking bare ip addresses against that list.
15bf4f68a0b2 Add dnswl support
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parents: 246
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599 </para>
15bf4f68a0b2 Add dnswl support
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600 <para>
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601 Add daily recipient limits based on some fixed multiple (perhaps 3?)
15bf4f68a0b2 Add dnswl support
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602 of the hourly limit.
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603 </para>
108
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604 </refsect1>
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605
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606 <refsect1 id='copyright.1'>
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607 <title>Copyright</title>
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608 <para>
261
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609 Copyright (C) 2012 by 510 Software Group &lt;carl@five-ten-sg.com&gt;
108
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610 </para>
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611 <para>
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612 This program is free software; you can redistribute it and/or modify it
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613 under the terms of the GNU General Public License as published by the
160
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614 Free Software Foundation; either version 3, or (at your option) any
108
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615 later version.
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616 </para>
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617 <para>
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618 You should have received a copy of the GNU General Public License along
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619 with this program; see the file COPYING. If not, please write to the
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620 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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621 </para>
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622 </refsect1>
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623
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624 <refsect1 id='version.1'>
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625 <title>Version</title>
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626 <para>
201
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627 @VERSION@
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628 </para>
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629 </refsect1>
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630 </refentry>
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631
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632
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diff changeset
633 <refentry id="@PACKAGE@.conf.5">
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634 <refentryinfo>
261
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diff changeset
635 <date>2012-07-21</date>
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diff changeset
636 <author>
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parents: 259
diff changeset
637 <firstname>Carl</firstname>
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parents: 259
diff changeset
638 <surname>Byington</surname>
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639 <affiliation><orgname>510 Software Group</orgname></affiliation>
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640 </author>
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641 </refentryinfo>
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642
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643 <refmeta>
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644 <refentrytitle>@PACKAGE@.conf</refentrytitle>
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645 <manvolnum>5</manvolnum>
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646 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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647 </refmeta>
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648
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diff changeset
649 <refnamediv id='name.5'>
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650 <refname>@PACKAGE@.conf</refname>
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651 <refpurpose>configuration file for @PACKAGE@ sendmail milter</refpurpose>
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652 </refnamediv>
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653
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diff changeset
654 <refsynopsisdiv id='synopsis.5'>
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655 <title>Synopsis</title>
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diff changeset
656 <cmdsynopsis>
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657 <command>@PACKAGE@.conf</command>
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diff changeset
658 </cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
659 </refsynopsisdiv>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
660
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
661 <refsect1 id='description.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
662 <title>Description</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
663 <para>The <command>@PACKAGE@.conf</command> configuration file is
148
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
664 specified by this partial bnf description. Comments start with //
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
665 or # and extend to the end of the line. To include the contents
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
666 of some file verbatim in the dnsbl.conf file, use
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
667 <literallayout class="monospaced"><![CDATA[include "<file>";]]></literallayout>
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
668 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
669
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
670 <literallayout class="monospaced"><![CDATA[
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
671 CONFIG = {CONTEXT ";"}+
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
672 CONTEXT = "context" NAME "{" {STATEMENT}+ "}"
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
673 STATEMENT = (DNSBL | DNSBLLIST | DNSWL | DNSWLLIST | CONTENT | ENV-TO
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
674 | VERIFY | GENERIC | W_REGEX | AUTOWHITE | CONTEXT | ENV-FROM
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
675 | RATE-LIMIT) ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
676
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
677 DNSBL = "dnsbl" NAME DNSPREFIX ERROR-MSG1
255
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
678 DNSBLLIST = "dnsbl_list" {NAME}*
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
679
255
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
680 DNSWL = "dnswl" NAME DNSPREFIX LEVEL
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
681 DNSWLLIST = "dnswl_list" {NAME}*
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
682 LEVEL = INTEGER
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
683
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
684 CONTENT = "content" ("on" | "off") "{" {CONTENT-ST}+ "}"
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
685 CONTENT-ST = (FILTER | URIBL | IGNORE | TLD | CCTLD | HTML-TAGS |
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
686 HTML-LIMIT | HOST-LIMIT | SPAMASS | REQUIRE | DCCGREY |
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
687 DCCBULK) ";"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
688 FILTER = "filter" DNSPREFIX ERROR-MSG2
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
689 URIBL = "uribl" DNSPREFIX ERROR-MSG3
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
690 IGNORE = "ignore" "{" {HOSTNAME [";"]}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
691 TLD = "tld" "{" {TLD [";"]}+ "}"
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
692 CCTLD = "cctld" "{" {TLD [";"]}+ "}"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
693 HTML-TAGS = "html_tags" "{" {HTMLTAG [";"]}+ "}"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
694 ERROR-MSG1 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
695 both are replaced with the client ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
696 ERROR-MSG2 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
697 the first is replaced with the hostname, and the second
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
698 is replaced with the ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
699 ERROR-MSG3 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
700 both are replaced with the hostname
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
701
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
702 HTML-LIMIT = "html_limit" ("on" INTEGER ERROR-MSG | "off")
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
703
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
704 HOST-LIMIT = "host_limit" ("on" INTEGER ERROR-MSG | "off" |
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
705 "soft" INTEGER)
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
706 SPAMASS = "spamassassin" INTEGER
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
707 REQUIRE = "require_match" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
708 DCCGREY = "dcc_greylist" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
709 DCCBULK = "dcc_bulk_threshold" (INTEGER | "many" | "off")
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
710
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
711 ENV-TO = "env_to" "{" {(TO-ADDR | DCC-TO)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
712 TO-ADDR = ADDRESS [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
713 DCC-TO = "dcc_to" ("ok" | "many") "{" DCCINCLUDEFILE "}" ";"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
714
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
715 VERIFY = "verify" HOSTNAME ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
716 GENERIC = "generic" REGULAREXPRESSION ERROR-MSG4 ";"
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
717 W-REGEX = "white_regex" REGULAREXPRESSION ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
718 ERROR-MSG4 = string containing exactly one %s replacement token
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
719 which is replaced with the client name
153
8d7c439bb6fa add auto whitelisting
carl
parents: 152
diff changeset
720 AUTOWHITE = "autowhite" DAYS FILENAME ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
721
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
722 ENV_FROM = "env_from" [DEFAULT] "{" {(FROM-ADDR | DCC-FROM)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
723 FROM-ADDR = ADDRESS VALUE [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
724 DCC-FROM = "dcc_from" "{" DCCINCLUDEFILE "}" ";"
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
725
255
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
726 RATE-LIMIT = "rate_limit" [DEFAULT_LIMIT [DAILY_MULTIPLE]] "{" (RATE)+ "}"
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
727 RATE = USER LIMIT [";"]
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
728 LIMIT = INTEGER
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
729 DEFAULT_LIMIT = INTEGER
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
730 DAILY_MULTIPLE = INTEGER
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
731
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
732 DEFAULT = ("white" | "black" | "unknown" | "inherit" | "")
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
733 ADDRESS = (USER@ | DOMAIN | USER@DOMAIN)
148
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
734 VALUE = ("white" | "black" | "unknown" | "inherit" | CHILD-CONTEXT-NAME)]]></literallayout>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
735 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
736
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
737 <refsect1 id='sample.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
738 <title>Sample</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
739 <literallayout class="monospaced"><![CDATA[
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
740 context main-default {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
741 // outbound dnsbl filtering to catch our own customers that end up on the sbl
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
742 dnsbl sbl sbl-xbl.spamhaus.org "Mail from %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
743 dnsbl_list sbl;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
744
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
745 // outbound content filtering to prevent our own customers from sending spam
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
746 content on {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
747 filter sbl-xbl.spamhaus.org "Mail containing %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
748 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.rulesemporium.com/cgi-bin/uribl.cgi?bl0=1&domain0=%s";
259
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
749 #uribl multi.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
750 ignore { include "hosts-ignore.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
751 tld { include "tld.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
752 cctld { include "cctld.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
753 html_tags { include "html-tags.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
754 html_limit on 20 "Mail containing excessive bad html tags rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
755 html_limit off;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
756 host_limit on 20 "Mail containing excessive host names rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
757 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
758 spamassassin 4;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
759 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
760 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
761 dcc_bulk_threshold 50;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
762 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
763
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
764 // backscatter prevention - don't send bounces for mail that we accepted but could not forward
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
765 // we only send bounces to our own customers
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
766 env_from unknown {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
767 "<>" black;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
768 };
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
769
259
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
770 // hourly recipient rate limit by smtp auth client id,
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
771 // or unauthenticated mail from address
255
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
772 // default hourly limit is 30
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
773 // daily limits are 4 times the hourly limit
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
774 rate_limit 30 4 { // default
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
775 #fred 100; // override default limits
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
776 #joe 10; // ""
263
e118fd2c6af0 fix unauthenticated rate limit bug for empty mail from; move unauthenticate rate limit checks after spam filtering
Carl Byington <carl@five-ten-sg.com>
parents: 261
diff changeset
777 #"sam@somedomain.tld" 500;
e118fd2c6af0 fix unauthenticated rate limit bug for empty mail from; move unauthenticate rate limit checks after spam filtering
Carl Byington <carl@five-ten-sg.com>
parents: 261
diff changeset
778 #"@otherdomain.tld" 100;
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
779 };
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
780 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
781
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
782 context main {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
783 dnsbl localp partial.blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
784 dnsbl local blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
785 dnsbl sbl zen.spamhaus.org "Mail from %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
786 dnsbl xbl xbl.spamhaus.org "Mail from %s rejected - xbl; see http://www.spamhaus.org/query/bl?ip=%s";
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
787 dnswl dnswl.org list.dnswl.org 2;
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
788 dnsbl_list local sbl;
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
789 dnswl_list dnswl.org;
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
790
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
791 content on {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
792 filter sbl-xbl.spamhaus.org "Mail containing %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
122
e8971c595845 fix typo in multi.surbl.org name
carl
parents: 119
diff changeset
793 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.rulesemporium.com/cgi-bin/uribl.cgi?bl0=1&domain0=%s";
259
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
794 #uribl multi.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
795 ignore { include "hosts-ignore.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
796 tld { include "tld.conf"; };
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
797 cctld { include "cctld.conf"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
798 html_tags { include "html-tags.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
799 html_limit off;
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
800 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
801 spamassassin 5;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
802 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
803 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
804 dcc_bulk_threshold 20;
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
805 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
806
216
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807 generic "^dsl.static.*ttnet.net.tr$|(^|[x.-])(ppp|h|host)?([0-9]{1,3}[x.-](Red-|dynamic[x.-])?){4}"
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808 "your mail server %s seems to have a generic name";
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809
259
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810 white_regex "=example.com=user@yourhostingaccount.com$";
233
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811
108
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812 env_to {
171
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813 # !! replace this with your domain names
108
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814 # child contexts are not allowed to specify recipient addresses outside these domains
179
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815 # if this is a backup-mx, you need to include here domains for which you relay to the primary mx
174
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816 include "/etc/mail/local-host-names";
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817 };
94
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818
108
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819 context whitelist {
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820 content off {};
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821 env_to {
171
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822 # dcc_to ok { include "/var/dcc/whitecommon"; };
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823 };
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824 env_from white {}; # white forces all unmatched from addresses (everyone in this case) to be whitelisted
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825 # so all mail TO these env_to addresses is accepted
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826 };
94
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827
171
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828 context abuse {
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829 dnsbl_list xbl;
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830 content off {};
174
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parents: 172
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831 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
171
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832 env_to {
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parents: 170
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833 abuse@ # no content filtering on abuse reports
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834 postmaster@ # ""
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835 };
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836 env_from unknown {}; # ignore all parent white/black listing
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parents: 170
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837 };
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parents: 170
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838
108
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parents: 104
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839 context minimal {
171
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840 dnsbl_list sbl;
178
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parents: 176
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841 content on {
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carl
parents: 176
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842 spamassassin 10;
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parents: 176
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843 dcc_bulk_threshold many;
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parents: 176
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844 };
171
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parents: 170
diff changeset
845 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
108
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parents: 104
diff changeset
846 env_to {
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parents: 104
diff changeset
847 };
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parents: 104
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848 };
94
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parents: 92
diff changeset
849
108
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parents: 104
diff changeset
850 context blacklist {
255
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
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parents: 253
diff changeset
851 dnsbl_list ;
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852 dnswl_list ;
108
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parents: 104
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853 env_to {
171
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854 # dcc_to many { include "/var/dcc/whitecommon"; };
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parents: 104
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855 };
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parents: 104
diff changeset
856 env_from black {}; # black forces all unmatched from addresses (everyone in this case) to be blacklisted
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parents: 104
diff changeset
857 # so all mail TO these env_to addresses is rejected
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parents: 104
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858 };
94
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parents: 92
diff changeset
859
171
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parents: 170
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860 env_from unknown {
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parents: 170
diff changeset
861 abuse@ abuse; # replies to abuse reports use the abuse context
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parents: 170
diff changeset
862 # dcc_from { include "/var/dcc/whitecommon"; };
108
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parents: 104
diff changeset
863 };
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parents: 104
diff changeset
864
171
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diff changeset
865 autowhite 90 "autowhite/my-auto-whitelist";
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parents: 170
diff changeset
866 # install should create /etc/dnsbl/autowhite writable by userid dnsbl
108
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parents: 104
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867 };]]></literallayout>
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parents: 104
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868 </refsect1>
94
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parents: 92
diff changeset
869
111
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parents: 108
diff changeset
870 <refsect1 id='version.5'>
201
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parents: 187
diff changeset
871 <title>Version</title>
108
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parents: 104
diff changeset
872 <para>
201
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parents: 187
diff changeset
873 @VERSION@
108
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parents: 104
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874 </para>
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875 </refsect1>
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parents: 104
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876
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parents: 104
diff changeset
877 </refentry>
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carl
parents: 104
diff changeset
878 </reference>