annotate xml/dnsbl.in @ 234:1c45d50cbbc6

Added tag stable-6-0-23 for changeset 5c3e9bf45bb5
author Carl Byington <carl@five-ten-sg.com>
date Mon, 25 May 2009 17:48:40 -0700
parents 5c3e9bf45bb5
children 8b0f16abee53
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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>2009-05-25</date>
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23 </refentryinfo>
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24
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25 <refmeta>
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26 <refentrytitle>@PACKAGE@</refentrytitle>
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27 <manvolnum>1</manvolnum>
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28 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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29 </refmeta>
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30
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31 <refnamediv id='name.1'>
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32 <refname>@PACKAGE@</refname>
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33 <refpurpose>a sendmail milter with per-user dnsbl filtering</refpurpose>
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34 </refnamediv>
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35
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36 <refsynopsisdiv id='synopsis.1'>
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37 <title>Synopsis</title>
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38 <cmdsynopsis>
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39 <command>@PACKAGE@</command>
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40 <arg><option>-c</option></arg>
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41 <arg><option>-s</option></arg>
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42 <arg><option>-d <replaceable class="parameter">n</replaceable></option></arg>
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43 <arg><option>-e <replaceable class="parameter">from|to</replaceable></option></arg>
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44 <arg><option>-b <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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45 <arg><option>-r <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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46 <arg><option>-p <replaceable class="parameter">sendmail-socket</replaceable></option></arg>
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47 <arg><option>-t <replaceable class="parameter">timeout</replaceable></option></arg>
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48 </cmdsynopsis>
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49 </refsynopsisdiv>
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50
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51 <refsect1 id='options.1'>
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52 <title>Options</title>
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53 <variablelist>
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54 <varlistentry>
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55 <term>-c</term>
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56 <listitem><para>
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57 Load the configuration file, print a cannonical form
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58 of the configuration on stdout, and exit.
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59 </para></listitem>
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60 </varlistentry>
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61 <varlistentry>
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62 <term>-s</term>
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63 <listitem><para>
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64 Stress test the configuration loading code by repeating
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65 the load/free cycle in an infinite loop.
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66 </para></listitem>
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67 </varlistentry>
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68 <varlistentry>
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69 <term>-d <replaceable class="parameter">n</replaceable></term>
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70 <listitem><para>
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71 Set the debug level to <replaceable class="parameter">n</replaceable>.
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72 </para></listitem>
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73 </varlistentry>
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74 <varlistentry>
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75 <term>-e <replaceable class="parameter">from|to</replaceable></term>
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76 <listitem><para>
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77 Print the results of looking up the from and to addresses in the
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78 current configuration. The | character is used to separate the from and to
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79 addresses in the argument to the -e switch.
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80 </para></listitem>
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81 </varlistentry>
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82 <varlistentry>
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83 <term>-b <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
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84 <listitem><para>
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85 Set the local socket used for the connection to the dccifd daemon.
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86 This is typically /var/dcc/dccifd.
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87 </para></listitem>
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88 </varlistentry>
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89 <varlistentry>
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90 <term>-r <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
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91 <listitem><para>
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92 Set the local socket used for the connection to our own dns resolver processes.
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93 </para></listitem>
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94 </varlistentry>
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95 <varlistentry>
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96 <term>-p <replaceable class="parameter">sendmail-socket</replaceable></term>
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97 <listitem><para>
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98 Set the socket used for the milter connection to sendmail. This is either
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99 "inet:port@ip-address" or "local:local-domain-socket-file-name".
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100 </para></listitem>
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101 </varlistentry>
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102 <varlistentry>
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103 <term>-t <replaceable class="parameter">timeout</replaceable></term>
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104 <listitem><para>
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105 Set the timeout in seconds used for communication with sendmail.
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106 </para></listitem>
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107 </varlistentry>
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108 </variablelist>
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109 </refsect1>
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111 <refsect1 id='usage.1'>
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112 <title>Usage</title>
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113 <para><command>@PACKAGE@</command> -c</para>
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114 <para><command>@PACKAGE@</command> -s</para>
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115 <para><command>@PACKAGE@</command> -e 'someone@aol.com|localname@mydomain.tld'</para>
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116 <para><command>@PACKAGE@</command> -d 10 -r resolver.sock -p local:dnsbl.sock</para>
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117 </refsect1>
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118
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119 <refsect1 id='installation.1'>
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120 <title>Installation</title>
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121 <para>
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122 This is now a standard GNU autoconf/automake installation, so the normal
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123 "./configure; make; su; make install" works. "make chkconfig" will
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124 setup the init.d runlevel scripts. Alternatively, you can use the
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125 source or binary RPMs at <ulink
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126 url="http://www.five-ten-sg.com/@PACKAGE@/packages">http://www.five-ten-sg.com/@PACKAGE@/packages</ulink>.
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127 </para>
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128 <para>
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129 Note that this has ONLY been tested on Linux, specifically RedHat Linux.
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130 In particular, this milter makes no attempt to understand IPv6. Your
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131 mileage will vary. You will need at a minimum a C++ compiler with a
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132 minimally thread safe STL implementation. The distribution includes a
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133 test.cpp program. If it fails this milter won't work. If it passes,
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134 this milter might work.
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135 </para>
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136 <para>
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137 Modify your sendmail.mc by removing all the "FEATURE(dnsbl" lines, add
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138 the following line in your sendmail.mc and rebuild the .cf file
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139 </para>
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140 <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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141 <para>
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142 Modify the default <citerefentry>
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143 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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144 </citerefentry> configuration.
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145 </para>
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146 </refsect1>
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147
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148 <refsect1 id='configuration.1'>
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149 <title>Configuration</title>
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150 <para>
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151 The configuration file is documented in <citerefentry>
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152 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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153 </citerefentry>. Any change to the config file, or any file included
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154 from that config file, will cause it to be reloaded within three
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155 minutes.
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156 </para>
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157 </refsect1>
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158
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159 <refsect1 id='introduction.1'>
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160 <title>Introduction</title>
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161 <para>
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162 Consider the case of a mail server that is acting as secondary MX for a
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163 collection of clients, each of which has a collection of mail domains.
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164 Each client may use their own collection of DNSBLs on their primary mail
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165 server. We present here a mechanism whereby the backup mail server can
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166 use the correct set of DNSBLs for each recipient for each message. As a
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167 side-effect, it gives us the ability to customize the set of DNSBLs on a
183
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168 per-recipient basis, so that fred@example.com could use LOCAL and the
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169 SBL, where all other users @example.com use only the SBL.
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170 </para>
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171 <para>
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172 This milter can also verify the envelope from/recipient pairs with the
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173 primary MX server. This allows the backup mail servers to properly
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174 reject mail sent to invalid addresses. Otherwise, the backup mail
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175 servers will accept that mail, and then generate a bounce message when
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176 the message is forwarded to the primary server (and rejected there with
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177 no such user). These rejections are the primary cause of such backscatter.
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178 </para>
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179 <para>
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180 This milter will also decode (uuencode, base64, mime, html entity, url
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181 encodings) and scan for HTTP and HTTPS URLs and bare hostnames in the
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182 body of the mail. If any of those host names have A or NS records on
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183 the SBL (or a single configurable DNSBL), the mail will be rejected
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184 unless previously whitelisted. This milter also counts the number of
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185 invalid HTML tags, and can reject mail if that count exceeds your
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186 specified limit.
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187 </para>
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188 <para>
136
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189 This milter can also impose hourly rate limits on the number of
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190 recipients accepted from SMTP AUTH connections, that would otherwise be
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191 allowed to relay thru this mail server with no spam filtering.
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192 </para>
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193 <para>
162
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194 Consider the case of a message from A to B passing thru this milter. If
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195 that message is not blocked, then we might eventually see a reply
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196 message from B to A. If the filtering context for A includes an
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197 autowhite entry, and that context does <emphasis>not</emphasis> cover B
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198 as a recipient, then this milter will add an entry in that file to
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199 whitelist such replies for a configurable time period. Suppose A and B
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200 are in the same domain, or at least use the same filtering context. In
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201 that case we don't want to add a whitelist entry for B, since that would
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202 then allow spammers to send mail from B (forged) to B. Such autowhite
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203 files need to be writeable by the dnsbl user, where all the other dnsbl
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204 configuration files only need to be readable by the dnsbl user.
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205 </para>
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206 <para>
176
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207 You can manually add such an autowhite entry, by appending a single
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208 text line to the autowhitelist file, using something like
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209 <command>echo "$mail 0" >>$autowhitefile</command>.
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210 You can manually remove such an autowhite entry, by appending a single
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211 text line to the autowhitelist file, using something like
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212 <command>echo "$mail 1" >>$autowhitefile</command>.
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213 </para>
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214 <para>
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215 The DNSBL milter reads a text configuration file (dnsbl.conf) on
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216 startup, and whenever the config file (or any of the referenced include
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217 files) is changed. The entire configuration file is case insensitive.
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218 If the configuration cannot be loaded due to a syntax error, the milter
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219 will log the error and quit. If the configuration cannot be reloaded
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220 after being modified, the milter will log the error and send an email to
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221 root from dnsbl@$hostname. You probably want to add dnsbl@$hostname
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222 to your /etc/mail/virtusertable since otherwise sendmail will reject
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223 that message.
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224 </para>
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225 </refsect1>
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226
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227 <refsect1 id='dcc.1'>
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228 <title>DCC Issues</title>
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229 <para>
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230 If you are also using the <ulink
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231 url="http://www.rhyolite.com/anti-spam/dcc/">DCC</ulink> milter, there
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232 are a few considerations. You may need to whitelist senders from the
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233 DCC bulk detector, or from the DNS based lists. Those are two very
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234 different reasons for whitelisting. The former is done thru the DCC
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235 whiteclnt config file, the later is done thru the DNSBL milter config
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236 file.
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237 </para>
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238 <para>
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239 You may want to blacklist some specific senders or sending domains.
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240 This could be done thru either the DCC (on a global basis, or for a
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241 specific single recipient). We prefer to do such blacklisting via the
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242 DNSBL milter config, since it can be done for a collection of recipient
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243 mail domains. The DCC approach has the feature that you can capture the
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244 entire message in the DCC log files. The DNSBL milter approach has the
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245 feature that the mail is rejected earlier (at RCPT TO time), and the
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246 sending machine just gets a generic "550 5.7.1 no such user" message.
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247 </para>
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248 <para>
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249 The DCC whiteclnt file can be included in the DNSBL milter config by the
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250 dcc_to and dcc_from statements. This will import the (env_to, env_from,
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251 and substitute mail_host) entries from the DCC config into the DNSBL
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252 config. This allows using the DCC config as the single point for
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253 white/blacklisting.
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254 </para>
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255 <para>
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256 Consider the case where you have multiple clients, each with their own
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257 mail servers, and each running their own DCC milters. Each client is
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258 using the DCC facilities for envelope from/to white/blacklisting.
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259 Presumably you can use rsync or scp to fetch copies of your clients DCC
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260 whiteclnt files on a regular basis. Your mail server, acting as a
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261 backup MX for your clients, can use the DNSBL milter, and include those
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262 client DCC config files. The envelope from/to white/blacklisting will
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263 be appropriately tagged and used only for the domains controlled by each
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264 of those clients.
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265 </para>
179
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266 <para>
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267 You can now use (via dccifd) different dcc filtering parameters on a per
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268 context basis. See the dcc_greylist and dcc_bulk_threshold statements
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269 in the <citerefentry> <refentrytitle>@PACKAGE@.conf</refentrytitle>
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270 <manvolnum>5</manvolnum> </citerefentry> configuration. Those
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271 statements are only active if you supply the <option>-b</option> option
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272 on the dnsbl command line. If you use the dcc via the standard dcc
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273 milter (dccm), then connections from clients that use SMTP AUTH are
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274 still subject to greylisting. If you use the dcc via dccifd and this
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275 milter, then connections from clients that use SMTP AUTH are never
180
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276 subject to greylisting. As part of this per-user greylisting, you need
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277 to move the dnsblnogrey file from the config directory to something
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278 like /var/dcc/userdirs/local/dnsblnogrey/whiteclnt so the dccifd will
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279 properly ignore greylisting for those recipients that don't want it.
179
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280 </para>
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281 </refsect1>
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282
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283 <refsect1 id='definitions.1'>
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284 <title>Definitions</title>
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285 <para>
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286 CONTEXT - a collection of parameters that defines the filtering context
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287 to be used for a collection of envelope recipient addresses. The
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288 context includes such things as the list of DNSBLs to be used, and the
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289 various content filtering parameters.
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290 </para>
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291 <para>
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292 DNSBL - a named DNS based blocking list is defined by a dns suffix (e.g.
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293 sbl-xbl.spamhaus.org) and a message string that is used to generate the
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294 "550 5.7.1" smtp error return code. The names of these DNSBLs will be
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295 used to define the DNSBL-LISTs.
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296 </para>
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297 <para>
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298 DNSBL-LIST - a named list of DNSBLs that will be used for specific
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299 recipients or recipient domains.
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300 </para>
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301 </refsect1>
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302
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303 <refsect1 id='filtering.1'>
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304 <title>Filtering Procedure</title>
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305 <para>
152
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306 The SMTP envelope 'from' and 'to' values are used in various checks.
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307 The first check is to see if a reply message (swapping the env_from and
160
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308 env_to values) would be unconditionally blocked (just based on the
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309 envelope from address). That check is similar to the main check
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310 described below, but there is no body content to be scanned, and there
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311 is no client connection ip address to be checked against DNSBLs. If
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312 such a reply message would be blocked, we also block the original
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313 outgoing message. This prevents folks from sending mail to recipients
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314 that are unable to reply.
152
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315 </para>
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316 <para>
136
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317 If the client has authenticated with sendmail, the rate limits are
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318 checked. If the authenticated user has not exceeded the hourly rate
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319 limit, then the mail is accepted, the filtering contexts are not used,
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320 the dns lists are not checked, and the body content is not scanned. If
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321 the client has not authenticated with sendmail, we follow these steps
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322 for each recipient.
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323 </para>
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324 <orderedlist>
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325 <listitem><para>
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326 The envelope to email address is used to find an initial filtering
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327 context. We first look for a context that specified the full email
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328 address in the env_to statement. If that is not found, we look for a
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329 context that specified the entire domain name of the envelope recipient
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330 in the env_to statement. If that is not found, we look for a context
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331 that specified the user@ part of the envelope recipient in the env_to
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332 statement. If that is not found, we use the first top level context
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333 defined in the config file.
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334 </para></listitem>
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335 <listitem><para>
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336 The initial filtering context may redirect to a child context based on
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337 the values in the initial context's env_from statement. We look for [1)
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338 the full envelope from email address, 2) the domain name part of the
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339 envelope from address, 3) the user@ part of the envelope from address]
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340 in that context's env_from statement, with values that point to a child
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341 context. If such an entry is found, we switch to that child filtering
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342 context.
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343 </para></listitem>
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344 <listitem><para>
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345 We lookup [1) the full envelope from email address, 2) the domain name
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346 part of the envelope from address, 3) the user@ part of the envelope
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347 from address] in the filtering context env_from statement. That results
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348 in one of (white, black, unknown, inherit).
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349 </para></listitem>
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350 <listitem><para>
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351 If the answer is black, mail to this recipient is rejected with "no such
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352 user", and the dns lists are not checked.
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353 </para></listitem>
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354 <listitem><para>
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355 If the answer is white, mail to this recipient is accepted and the dns
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356 lists are not checked.
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357 </para></listitem>
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358 <listitem><para>
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359 If the answer is unknown, we don't reject yet, but the dns lists will be
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360 checked, and the content may be scanned.
111
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361 </para></listitem>
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362 <listitem><para>
108
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363 If the answer is inherit, we repeat the envelope from search in the
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364 parent context.
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365 </para></listitem>
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366 <listitem><para>
233
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367 If the mail has not been accepted or rejected yet, and the filtering
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368 context (or any ancestor context) specifies a non-empty whitelist regular
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369 expression, then we check the envelope from value against that regex.
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370 The mail is accepted if the envelope from value matches the specified regular
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371 expression.
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parents: 216
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372 </para></listitem>
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parents: 216
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373 <listitem><para>
168
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374 If the mail has not been accepted or rejected yet, the dns lists
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375 specified in the filtering context are checked and the mail is rejected
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376 if any list has an A record for the standard dns based lookup scheme
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377 (reversed octets of the client followed by the dns suffix).
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378 </para></listitem>
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379 <listitem><para>
6bac960af6b4 add generic reverse dns filtering regex
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diff changeset
380 If the mail has not been accepted or rejected yet, and the filtering
170
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381 context (or any ancestor context) specifies a non-empty generic regular
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diff changeset
382 expression, then we check the fully qualified client name (obtained via
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383 the sendmail macro "_"). The mail is rejected if the client name
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diff changeset
384 matches the specified regular expression.
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385 </para></listitem>
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diff changeset
386 <listitem><para>
108
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387 If the mail has not been accepted or rejected yet, we look for a
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388 verification context, which is the closest ancestor of the filtering
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389 context that both specifies a verification host, and which covers the
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390 envelope to address. If we find such a verification context, and the
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391 verification host is not our own hostname, we open an smtp conversation
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392 with that verification host. The current envelope from and recipient to
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393 values are passed to that verification host. If we receive a 5xy
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394 response those commands, we reject the current recipient with "no such
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395 user".
111
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396 </para></listitem>
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397 <listitem><para>
108
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398 If the mail has not been accepted or rejected yet, and the filtering
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parents: 104
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399 context enables content filtering, and this is the first such recipient
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400 in this smtp transaction, we set the content filtering parameters from
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401 this context, and enable content filtering for the body of this message.
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402 </para></listitem>
108
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403 </orderedlist>
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404 <para>
160
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405 For each recipient that was accepted, we search for an autowhite entry
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carl
parents: 158
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406 starting in the reply filtering context. If an autowhite entry is found,
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carl
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407 we add the recipient to that auto whitelist file. This will prevent reply
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408 messages from being blocked by the dnsbl or content filtering.
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409 </para>
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410 <para>
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411 If content filtering is enabled for this body, the mail text is decoded
119
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carl
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412 (uuencode, base64, mime, html entity, url encodings), and scanned for HTTP
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
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413 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
414 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
415 &lt;configurable&gt; host names are checked as follows.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
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416 </para>
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carl
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417 <para>
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carl
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418 The only known list that is suitable for the content filter DNSBL is the
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carl
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419 SBL. If the content filter DNSBL is defined, and any of those host
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
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420 names resolve to ip addresses that are on that DNSBL (or have
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carl
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diff changeset
421 nameservers that are on that list), and the host name is not on the
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
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422 &lt;configurable&gt; ignore list, the mail is rejected.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
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423 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
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424 <para>
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diff changeset
425 If the content uribl DNSBL is defined, and any of those host names are
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carl
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426 on that DNSBL, and the host name is not on the &lt;configurable&gt;
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
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427 ignore list, the mail is rejected.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
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428 </para>
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diff changeset
429 <para>
167
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430 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.
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431 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
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diff changeset
432 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
433 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
434 spamassassin limit of three will reject messages with spamassassin scores
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
435 of four or greater.
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
436 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
437 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
438 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
439 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
440 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
441 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
442 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
443 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
444 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
445 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
446 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>
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diff changeset
447 than or equal to the DCC bulk score.
163
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448 </para>
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449 <para>
119
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450 We also scan for excessive bad html tags, and if a &lt;configurable&gt;
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451 limit is exceeded, the mail is rejected.
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452 </para>
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453 </refsect1>
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454
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455 <refsect1 id='access.1'>
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456 <title>Sendmail access vs. DNSBL</title>
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457 <para>
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458 With the standard sendmail.mc dnsbl FEATURE, the dnsbl checks may be
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carl
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459 suppressed by entries in the /etc/mail/access database. For example,
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carl
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460 suppose you control a /18 of address space, and have allocated some /24s
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461 to some clients. You have access entries like
111
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462 <literallayout class="monospaced"><![CDATA[
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463 192.168.4 OK
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464 192.168.17 OK]]></literallayout>
108
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465 </para>
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466 <para>
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467 to allow those clients to smarthost thru your mail server. Now if one
1c7677042b78 move to autoconf/automake/docbook
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468 of those clients happens get infected with a virus that turns a machine
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469 into an open proxy, and their 192.168.4.45 lands on the SBL-XBL, you
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470 will still wind up allowing that infected machine to smarthost thru your
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471 mail servers.
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472 </para>
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473 <para>
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474 With this DNSBL milter, the sendmail access database cannot override the
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475 dnsbl checks, so that machine won't be able to send mail to or thru your
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476 smarthost mail server (unless the virus/proxy can use smtp-auth).
1c7677042b78 move to autoconf/automake/docbook
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parents: 104
diff changeset
477 </para>
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carl
parents: 104
diff changeset
478 <para>
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diff changeset
479 Using the standard sendmail features, you would add access entries to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
480 allow hosts on your local network to relay thru your mail server. Those
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
481 OK entries in the sendmail access database will override all the dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
482 checks. With this DNSBL milter, you will need to have the local users
1c7677042b78 move to autoconf/automake/docbook
carl
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diff changeset
483 authenticate with smtp-auth to get the same effect. You might find
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carl
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diff changeset
484 <ulink
1c7677042b78 move to autoconf/automake/docbook
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diff changeset
485 url="http://www.ists.dartmouth.edu/classroom/sendmail-ssl-how-to.php">
1c7677042b78 move to autoconf/automake/docbook
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diff changeset
486 these directions</ulink> helpful for setting up smtp-auth if you are on
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
487 RH Linux.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
488 </para>
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carl
parents: 104
diff changeset
489 </refsect1>
94
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parents: 92
diff changeset
490
111
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diff changeset
491 <refsect1 id='performance.1'>
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diff changeset
492 <title>Performance Issues</title>
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diff changeset
493 <para>
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parents: 104
diff changeset
494 Consider a high volume high performance machine running sendmail. Each
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carl
parents: 104
diff changeset
495 sendmail process can do its own dns resolution. Typically, such dns
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
496 resolver libraries are not thread safe, and so must be protected by some
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
497 sort of mutex in a threaded environment. When we add a milter to
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carl
parents: 104
diff changeset
498 sendmail, we now have a collection of sendmail processes, and a
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carl
parents: 104
diff changeset
499 collection of milter threads.
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carl
parents: 104
diff changeset
500 </para>
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carl
parents: 104
diff changeset
501 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
502 We will be doing a lot of dns lookups per mail message, and at least
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
503 some of those will take many tens of seconds. If all this dns work is
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carl
parents: 104
diff changeset
504 serialized inside the milter, we have an upper limit of about 25K mail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
505 messages per day. That is clearly not sufficient for many sites.
1c7677042b78 move to autoconf/automake/docbook
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parents: 104
diff changeset
506 </para>
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carl
parents: 104
diff changeset
507 <para>
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parents: 104
diff changeset
508 Since we want to do parallel dns resolution across those milter threads,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
509 we add another collection of dns resolver processes. Each sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
510 process is talking to a milter thread over a socket, and each milter
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parents: 104
diff changeset
511 thread is talking to a dns resolver process over another socket.
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parents: 104
diff changeset
512 </para>
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diff changeset
513 <para>
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carl
parents: 104
diff changeset
514 Suppose we are processing 20 messages per second, and each message
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
515 requires 20 seconds of dns work. Then we will have 400 sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
516 processes, 400 milter threads, and 400 dns resolver processes. Of
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carl
parents: 104
diff changeset
517 course that steady state is very unlikely to happen.
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parents: 104
diff changeset
518 </para>
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parents: 104
diff changeset
519 </refsect1>
94
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parents: 92
diff changeset
520
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parents: 92
diff changeset
521
111
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parents: 108
diff changeset
522 <refsect1 id='rejected.1'>
108
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parents: 104
diff changeset
523 <title>Rejected Ideas</title>
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carl
parents: 104
diff changeset
524 <para>
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parents: 104
diff changeset
525 The following ideas have been considered and rejected.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
526 </para>
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parents: 104
diff changeset
527 <para>
111
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parents: 108
diff changeset
528 Add max_recipients setting to the context configuration. Recipients in
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carl
parents: 108
diff changeset
529 excess of that limit will be rejected, and all the non-whitelisted
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carl
parents: 108
diff changeset
530 recipients will be removed. Current spammers *very* rarely send more
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carl
parents: 108
diff changeset
531 than ten recipients in a single smtp transaction, so this won't stop any
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
532 significant amount of spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
533 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
534 <para>
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carl
parents: 104
diff changeset
535 Add poison addresses to the configuration. If any recipient is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
536 poison, all recipients are rejected even if they would be whitelisted,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
537 and the data is rejected if sent. I have a collection of spam trap
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
538 addresses that would be suitable for such use. Based on my log files,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
539 any mail to those spam trap addresses is rejected based on either dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
540 lookups or the DCC. So this won't result in blocking any additional
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
541 spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
542 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
543 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
544 Add an option to only allow one recipient if the return path is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
545 empty. Based on my log files, there is no mail that violates this
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
546 check.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
547 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
548 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
549 Reject the mail if the envelope from domain name contains any MX
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
550 records pointing to 127.0.0.0/8. I don't see any significant amount of
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carl
parents: 104
diff changeset
551 spam sent with such domain names.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
552 </para>
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carl
parents: 104
diff changeset
553 </refsect1>
94
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carl
parents: 92
diff changeset
554
108
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parents: 104
diff changeset
555 <refsect1 id='todo.1'>
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carl
parents: 104
diff changeset
556 <title>TODO</title>
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carl
parents: 104
diff changeset
557 <para>
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carl
parents: 104
diff changeset
558 The following ideas are under consideration.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
559 </para>
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carl
parents: 104
diff changeset
560 <para>
115
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
561 Look for href="hostname/path" strings that are missing the required
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
562 http:// protocol header. Such references are still clickable in common
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
563 mail software.
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
564 </para>
108
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parents: 104
diff changeset
565 </refsect1>
94
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parents: 92
diff changeset
566
111
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parents: 108
diff changeset
567 <refsect1 id='copyright.1'>
108
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parents: 104
diff changeset
568 <title>Copyright</title>
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parents: 104
diff changeset
569 <para>
163
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parents: 162
diff changeset
570 Copyright (C) 2007 by 510 Software Group &lt;carl@five-ten-sg.com&gt;
108
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parents: 104
diff changeset
571 </para>
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carl
parents: 104
diff changeset
572 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
573 This program is free software; you can redistribute it and/or modify it
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
574 under the terms of the GNU General Public License as published by the
160
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carl
parents: 158
diff changeset
575 Free Software Foundation; either version 3, or (at your option) any
108
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carl
parents: 104
diff changeset
576 later version.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
577 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
578 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
579 You should have received a copy of the GNU General Public License along
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
580 with this program; see the file COPYING. If not, please write to the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
581 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
582 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
583 </refsect1>
94
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carl
parents: 92
diff changeset
584
111
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parents: 108
diff changeset
585 <refsect1 id='version.1'>
201
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Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
586 <title>Version</title>
108
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parents: 104
diff changeset
587 <para>
201
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Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
588 @VERSION@
108
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parents: 104
diff changeset
589 </para>
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carl
parents: 104
diff changeset
590 </refsect1>
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carl
parents: 104
diff changeset
591 </refentry>
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carl
parents: 104
diff changeset
592
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
593
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
594 <refentry id="@PACKAGE@.conf.5">
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parents: 104
diff changeset
595 <refentryinfo>
233
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parents: 216
diff changeset
596 <date>2009-05-25</date>
108
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parents: 104
diff changeset
597 </refentryinfo>
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parents: 92
diff changeset
598
108
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carl
parents: 104
diff changeset
599 <refmeta>
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carl
parents: 104
diff changeset
600 <refentrytitle>@PACKAGE@.conf</refentrytitle>
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carl
parents: 104
diff changeset
601 <manvolnum>5</manvolnum>
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carl
parents: 104
diff changeset
602 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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parents: 104
diff changeset
603 </refmeta>
94
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parents: 92
diff changeset
604
108
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parents: 104
diff changeset
605 <refnamediv id='name.5'>
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parents: 104
diff changeset
606 <refname>@PACKAGE@.conf</refname>
111
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parents: 108
diff changeset
607 <refpurpose>configuration file for @PACKAGE@ sendmail milter</refpurpose>
108
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parents: 104
diff changeset
608 </refnamediv>
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parents: 104
diff changeset
609
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
610 <refsynopsisdiv id='synopsis.5'>
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parents: 104
diff changeset
611 <title>Synopsis</title>
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carl
parents: 104
diff changeset
612 <cmdsynopsis>
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carl
parents: 104
diff changeset
613 <command>@PACKAGE@.conf</command>
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carl
parents: 104
diff changeset
614 </cmdsynopsis>
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parents: 104
diff changeset
615 </refsynopsisdiv>
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parents: 92
diff changeset
616
108
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parents: 104
diff changeset
617 <refsect1 id='description.5'>
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parents: 104
diff changeset
618 <title>Description</title>
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parents: 104
diff changeset
619 <para>The <command>@PACKAGE@.conf</command> configuration file is
148
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carl
parents: 144
diff changeset
620 specified by this partial bnf description. Comments start with //
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carl
parents: 144
diff changeset
621 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
622 of some file verbatim in the dnsbl.conf file, use
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carl
parents: 144
diff changeset
623 <literallayout class="monospaced"><![CDATA[include "<file>";]]></literallayout>
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parents: 144
diff changeset
624 </para>
108
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parents: 104
diff changeset
625
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
626 <literallayout class="monospaced"><![CDATA[
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carl
parents: 104
diff changeset
627 CONFIG = {CONTEXT ";"}+
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carl
parents: 104
diff changeset
628 CONTEXT = "context" NAME "{" {STATEMENT}+ "}"
233
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Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
629 STATEMENT = (DNSBL | DNSBLLIST | CONTENT | ENV-TO | VERIFY | GENERIC
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Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
630 | W_REGEX | AUTOWHITE | CONTEXT | ENV-FROM | RATE-LIMIT) ";"
108
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carl
parents: 104
diff changeset
631
124
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carl
parents: 122
diff changeset
632 DNSBL = "dnsbl" NAME DNSPREFIX ERROR-MSG1
108
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parents: 104
diff changeset
633
1c7677042b78 move to autoconf/automake/docbook
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parents: 104
diff changeset
634 DNSBLLIST = "dnsbl_list" {NAME}+
94
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parents: 92
diff changeset
635
108
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parents: 104
diff changeset
636 CONTENT = "content" ("on" | "off") "{" {CONTENT-ST}+ "}"
178
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carl
parents: 176
diff changeset
637 CONTENT-ST = (FILTER | URIBL | IGNORE | TLD | CCTLD | HTML-TAGS |
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carl
parents: 176
diff changeset
638 HTML-LIMIT | HOST-LIMIT | SPAMASS | REQUIRE | DCCGREY |
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carl
parents: 176
diff changeset
639 DCCBULK) ";"
124
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parents: 122
diff changeset
640 FILTER = "filter" DNSPREFIX ERROR-MSG2
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parents: 122
diff changeset
641 URIBL = "uribl" DNSPREFIX ERROR-MSG3
108
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parents: 104
diff changeset
642 IGNORE = "ignore" "{" {HOSTNAME [";"]}+ "}"
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parents: 104
diff changeset
643 TLD = "tld" "{" {TLD [";"]}+ "}"
119
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carl
parents: 115
diff changeset
644 CCTLD = "cctld" "{" {TLD [";"]}+ "}"
108
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parents: 104
diff changeset
645 HTML-TAGS = "html_tags" "{" {HTMLTAG [";"]}+ "}"
124
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carl
parents: 122
diff changeset
646 ERROR-MSG1 = string containing exactly two %s replacement tokens
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carl
parents: 122
diff changeset
647 both are replaced with the client ip address
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carl
parents: 122
diff changeset
648 ERROR-MSG2 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
649 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
650 is replaced with the ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
651 ERROR-MSG3 = string containing exactly two %s replacement tokens
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parents: 122
diff changeset
652 both are replaced with the hostname
108
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parents: 104
diff changeset
653
1c7677042b78 move to autoconf/automake/docbook
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parents: 104
diff changeset
654 HTML-LIMIT = "html_limit" ("on" INTEGER ERROR-MSG | "off")
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parents: 104
diff changeset
655
111
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parents: 108
diff changeset
656 HOST-LIMIT = "host_limit" ("on" INTEGER ERROR-MSG | "off" |
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carl
parents: 108
diff changeset
657 "soft" INTEGER)
178
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carl
parents: 176
diff changeset
658 SPAMASS = "spamassassin" INTEGER
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
659 REQUIRE = "require_match" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
660 DCCGREY = "dcc_greylist" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
661 DCCBULK = "dcc_bulk_threshold" (INTEGER | "many" | "off")
94
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diff changeset
662
108
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parents: 104
diff changeset
663 ENV-TO = "env_to" "{" {(TO-ADDR | DCC-TO)}+ "}"
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carl
parents: 104
diff changeset
664 TO-ADDR = ADDRESS [";"]
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parents: 104
diff changeset
665 DCC-TO = "dcc_to" ("ok" | "many") "{" DCCINCLUDEFILE "}" ";"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
666
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
667 VERIFY = "verify" HOSTNAME ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
668 GENERIC = "generic" REGULAREXPRESSION ERROR-MSG4 ";"
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
669 W-REGEX = "white_regex" REGULAREXPRESSION ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
670 ERROR-MSG4 = string containing exactly one %s replacement token
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
671 which is replaced with the client name
153
8d7c439bb6fa add auto whitelisting
carl
parents: 152
diff changeset
672 AUTOWHITE = "autowhite" DAYS FILENAME ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
673
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
674 ENV_FROM = "env_from" [DEFAULT] "{" {(FROM-ADDR | DCC-FROM)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
675 FROM-ADDR = ADDRESS VALUE [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
676 DCC-FROM = "dcc_from" "{" DCCINCLUDEFILE "}" ";"
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
677
140
4028de9b46dd cleanup smtp rate limit code
carl
parents: 136
diff changeset
678 RATE-LIMIT = "rate_limit" [DEFAULTLIMIT] "{" (RATE)+ "}"
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
679 RATE = USER LIMIT [";"]
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
680
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
681 DEFAULT = ("white" | "black" | "unknown" | "inherit" | "")
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
682 ADDRESS = (USER@ | DOMAIN | USER@DOMAIN)
148
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
683 VALUE = ("white" | "black" | "unknown" | "inherit" | CHILD-CONTEXT-NAME)]]></literallayout>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
684 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
685
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
686 <refsect1 id='sample.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
687 <title>Sample</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
688 <literallayout class="monospaced"><![CDATA[
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
689 context main-default {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
690 // 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
691 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
692 dnsbl_list sbl;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
693
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
694 // outbound content filtering to prevent our own customers from sending spam
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
695 content on {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
696 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
697 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.rulesemporium.com/cgi-bin/uribl.cgi?bl0=1&domain0=%s";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
698 #uribl black.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
699 ignore { include "hosts-ignore.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
700 tld { include "tld.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
701 cctld { include "cctld.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
702 html_tags { include "html-tags.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
703 html_limit on 20 "Mail containing excessive bad html tags rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
704 html_limit off;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
705 host_limit on 20 "Mail containing excessive host names rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
706 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
707 spamassassin 4;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
708 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
709 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
710 dcc_bulk_threshold 50;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
711 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
712
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
713 // 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
714 // we only send bounces to our own customers
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
715 env_from unknown {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
716 "<>" black;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
717 };
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
718
144
31ff00ea6bfb allow parent/child to share a fully qualified env_to address
carl
parents: 140
diff changeset
719 // hourly recipient rate limit by smtp auth client id
140
4028de9b46dd cleanup smtp rate limit code
carl
parents: 136
diff changeset
720 rate_limit 30 { // default
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
721 #fred 100; // override default limits
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
722 #joe 10; // ""
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
723 };
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
724 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
725
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
726 context main {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
727 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
728 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
729 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
730 dnsbl xbl xbl.spamhaus.org "Mail from %s rejected - xbl; see http://www.spamhaus.org/query/bl?ip=%s";
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
731 dnsbl_list local sbl;
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
732
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
733 content on {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
734 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
735 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.rulesemporium.com/cgi-bin/uribl.cgi?bl0=1&domain0=%s";
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
736 #uribl black.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
737 ignore { include "hosts-ignore.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
738 tld { include "tld.conf"; };
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
739 cctld { include "cctld.conf"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
740 html_tags { include "html-tags.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
741 html_limit off;
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
742 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
743 spamassassin 5;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
744 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
745 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
746 dcc_bulk_threshold 20;
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
747 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
748
216
784030ac71f1 Never whitelist self addressed mail. Changes for Fedora 10 and const correctness.
Carl Byington <carl@five-ten-sg.com>
parents: 214
diff changeset
749 generic "^dsl.static.*ttnet.net.tr$|(^|[x.-])(ppp|h|host)?([0-9]{1,3}[x.-](Red-|dynamic[x.-])?){4}"
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
750 "your mail server %s seems to have a generic name";
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
751
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
752 white_regex ".*=example.com=user@yourhostingaccount.com";
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
753
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
754 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
755 # !! replace this with your domain names
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
756 # child contexts are not allowed to specify recipient addresses outside these domains
179
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
757 # if this is a backup-mx, you need to include here domains for which you relay to the primary mx
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
758 include "/etc/mail/local-host-names";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
759 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
760
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
761 context whitelist {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
762 content off {};
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
763 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
764 # dcc_to ok { include "/var/dcc/whitecommon"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
765 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
766 env_from white {}; # white forces all unmatched from addresses (everyone in this case) to be whitelisted
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
767 # so all mail TO these env_to addresses is accepted
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
768 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
769
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
770 context abuse {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
771 dnsbl_list xbl;
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
772 content off {};
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
773 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
774 env_to {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
775 abuse@ # no content filtering on abuse reports
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
776 postmaster@ # ""
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
777 };
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
778 env_from unknown {}; # ignore all parent white/black listing
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
779 };
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
780
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
781 context minimal {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
782 dnsbl_list sbl;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
783 content on {
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
784 spamassassin 10;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
785 dcc_bulk_threshold many;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
786 };
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
787 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
788 env_to {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
789 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
790 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
791
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
792 context blacklist {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
793 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
794 # dcc_to many { include "/var/dcc/whitecommon"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
795 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
796 env_from black {}; # black forces all unmatched from addresses (everyone in this case) to be blacklisted
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
797 # so all mail TO these env_to addresses is rejected
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
798 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
799
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
800 env_from unknown {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
801 abuse@ abuse; # replies to abuse reports use the abuse context
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
802 # dcc_from { include "/var/dcc/whitecommon"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
803 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
804
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
805 autowhite 90 "autowhite/my-auto-whitelist";
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
806 # install should create /etc/dnsbl/autowhite writable by userid dnsbl
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
807 };]]></literallayout>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
808 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
809
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
810 <refsect1 id='version.5'>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
811 <title>Version</title>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
812 <para>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
813 @VERSION@
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
814 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
815 </refsect1>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
816
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
817 </refentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
818 </reference>