annotate xml/dnsbl.in @ 164:5809bcdc325b stable-6-0-4

spamassassin changes
author carl
date Sun, 26 Aug 2007 19:43:35 -0700
parents 97d7da45fe2a
children 9b129ed78d7d
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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 <para>The various source and binary packages are available at <ulink
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6 url="http://www.five-ten-sg.com/@PACKAGE@/packages/">http://www.five-ten-sg.com/@PACKAGE@/packages/</ulink>
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7 The most recent documentation is available at <ulink
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8 url="http://www.five-ten-sg.com/@PACKAGE@/">http://www.five-ten-sg.com/@PACKAGE@/</ulink>
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9 </para>
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10
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11 </partintro>
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12
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13 <refentry id="@PACKAGE@.1">
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14 <refentryinfo>
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15 <date>2007-07-26</date>
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16 </refentryinfo>
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17
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18 <refmeta>
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19 <refentrytitle>@PACKAGE@</refentrytitle>
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20 <manvolnum>1</manvolnum>
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21 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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22 </refmeta>
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23
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24 <refnamediv id='name.1'>
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25 <refname>@PACKAGE@</refname>
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26 <refpurpose>a sendmail milter with per-user dnsbl filtering</refpurpose>
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27 </refnamediv>
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28
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29 <refsynopsisdiv id='synopsis.1'>
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30 <title>Synopsis</title>
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31 <cmdsynopsis>
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32 <command>@PACKAGE@</command>
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33 <arg><option>-c</option></arg>
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34 <arg><option>-s</option></arg>
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35 <arg><option>-d <replaceable class="parameter">n</replaceable></option></arg>
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36 <arg><option>-e <replaceable class="parameter">from|to</replaceable></option></arg>
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37 <arg><option>-r <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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38 <arg><option>-p <replaceable class="parameter">sendmail-socket</replaceable></option></arg>
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39 <arg><option>-t <replaceable class="parameter">timeout</replaceable></option></arg>
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40 </cmdsynopsis>
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41 </refsynopsisdiv>
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42
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43 <refsect1 id='options.1'>
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44 <title>Options</title>
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45 <variablelist>
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46 <varlistentry>
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47 <term>-c</term>
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48 <listitem><para>
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49 Load the configuration file, print a cannonical form
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50 of the configuration on stdout, and exit.
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51 </para></listitem>
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52 </varlistentry>
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53 <varlistentry>
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54 <term>-s</term>
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55 <listitem><para>
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56 Stress test the configuration loading code by repeating
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57 the load/free cycle in an infinite loop.
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58 </para></listitem>
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59 </varlistentry>
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60 <varlistentry>
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61 <term>-d <replaceable class="parameter">n</replaceable></term>
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62 <listitem><para>
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63 Set the debug level to <replaceable class="parameter">n</replaceable>.
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64 </para></listitem>
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65 </varlistentry>
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66 <varlistentry>
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67 <term>-e <replaceable class="parameter">from|to</replaceable></term>
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68 <listitem><para>
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69 Print the results of looking up the from and to addresses in the
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70 current configuration. The | character is used to separate the from and to
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71 addresses in the argument to the -e switch.
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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>-r <replaceable class="parameter">local-domain-socket</replaceable></term>
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76 <listitem><para>
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77 Set the local socket used for the connection to our own dns resolver processes.
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78 </para></listitem>
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79 </varlistentry>
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80 <varlistentry>
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81 <term>-p <replaceable class="parameter">sendmail-socket</replaceable></term>
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82 <listitem><para>
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83 Set the socket used for the milter connection to sendmail. This is either
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84 "inet:port@ip-address" or "local:local-domain-socket-file-name".
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85 </para></listitem>
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86 </varlistentry>
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87 <varlistentry>
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88 <term>-t <replaceable class="parameter">timeout</replaceable></term>
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89 <listitem><para>
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90 Set the timeout in seconds used for communication with sendmail.
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91 </para></listitem>
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92 </varlistentry>
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93 </variablelist>
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94 </refsect1>
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95
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96 <refsect1 id='usage.1'>
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97 <title>Usage</title>
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98 <para><command>@PACKAGE@</command> -c</para>
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99 <para><command>@PACKAGE@</command> -s</para>
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100 <para><command>@PACKAGE@</command> -e 'someone@aol.com|localname@mydomain.tld'</para>
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101 <para><command>@PACKAGE@</command> -d 10 -r resolver.sock -p local:dnsbl.sock</para>
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102 </refsect1>
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103
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104 <refsect1 id='installation.1'>
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105 <title>Installation</title>
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106 <para>
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107 This is now a standard GNU autoconf/automake installation, so the normal
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108 "./configure; make; su; make install" works. "make chkconfig" will
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109 setup the init.d runlevel scripts. Alternatively, you can use the
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110 source or binary RPMs at <ulink
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111 url="http://www.five-ten-sg.com/@PACKAGE@/packages">http://www.five-ten-sg.com/@PACKAGE@/packages</ulink>.
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112 </para>
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113 <para>
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114 Note that this has ONLY been tested on Linux, specifically RedHat Linux.
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115 In particular, this milter makes no attempt to understand IPv6. Your
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116 mileage will vary. You will need at a minimum a C++ compiler with a
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117 minimally thread safe STL implementation. The distribution includes a
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118 test.cpp program. If it fails this milter won't work. If it passes,
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119 this milter might work.
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120 </para>
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121 <para>
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122 Modify your sendmail.mc by removing all the "FEATURE(dnsbl" lines, add
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123 the following line in your sendmail.mc and rebuild the .cf file
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124 </para>
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125 <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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126 <para>
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127 Modify the default <citerefentry>
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128 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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129 </citerefentry> configuration.
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130 </para>
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131 </refsect1>
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132
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133 <refsect1 id='configuration.1'>
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134 <title>Configuration</title>
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135 <para>
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136 The configuration file is documented in <citerefentry>
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137 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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138 </citerefentry>. Any change to the config file, or any file included
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139 from that config file, will cause it to be reloaded within three
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140 minutes.
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141 </para>
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142 </refsect1>
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143
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144 <refsect1 id='introduction.1'>
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145 <title>Introduction</title>
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146 <para>
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147 Consider the case of a mail server that is acting as secondary MX for a
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148 collection of clients, each of which has a collection of mail domains.
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149 Each client may use their own collection of DNSBLs on their primary mail
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150 server. We present here a mechanism whereby the backup mail server can
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151 use the correct set of DNSBLs for each recipient for each message. As a
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152 side-effect, it gives us the ability to customize the set of DNSBLs on a
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153 per-recipient basis, so that fred@example.com could use SPEWS and the
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154 SBL, where all other users @example.com use only the SBL.
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155 </para>
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156 <para>
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157 This milter can also verify the envelope from/recipient pairs with the
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158 primary MX server. This allows the backup mail servers to properly
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159 reject mail sent to invalid addresses. Otherwise, the backup mail
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160 servers will accept that mail, and then generate a bounce message when
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161 the message is forwarded to the primary server (and rejected there with
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162 no such user). These rejections are the primary cause of such backscatter.
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163 </para>
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164 <para>
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165 This milter will also decode (uuencode, base64, mime, html entity, url
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166 encodings) and scan for HTTP and HTTPS URLs and bare hostnames in the
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167 body of the mail. If any of those host names have A or NS records on
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168 the SBL (or a single configurable DNSBL), the mail will be rejected
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169 unless previously whitelisted. This milter also counts the number of
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170 invalid HTML tags, and can reject mail if that count exceeds your
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171 specified limit.
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172 </para>
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173 <para>
136
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174 This milter can also impose hourly rate limits on the number of
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175 recipients accepted from SMTP AUTH connections, that would otherwise be
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176 allowed to relay thru this mail server with no spam filtering.
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177 </para>
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178 <para>
162
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179 Consider the case of a message from A to B passing thru this milter. If
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180 that message is not blocked, then we might eventually see a reply
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181 message from B to A. If the filtering context for A includes an
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182 autowhite entry, and that context does <emphasis>not</emphasis> cover B
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183 as a recipient, then this milter will add an entry in that file to
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184 whitelist such replies for a configurable time period. Suppose A and B
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185 are in the same domain, or at least use the same filtering context. In
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186 that case we don't want to add a whitelist entry for B, since that would
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187 then allow spammers to send mail from B (forged) to B. Such autowhite
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188 files need to be writeable by the dnsbl user, where all the other dnsbl
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189 configuration files only need to be readable by the dnsbl user.
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190 </para>
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191 <para>
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192 The DNSBL milter reads a text configuration file (dnsbl.conf) on
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193 startup, and whenever the config file (or any of the referenced include
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194 files) is changed. The entire configuration file is case insensitive.
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195 If the configuration cannot be loaded due to a syntax error, the milter
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196 will log the error and quit. If the configuration cannot be reloaded
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197 after being modified, the milter will log the error and send an email to
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198 root from dnsbl@$hostname. You probably want to add dnsbl@$hostname
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199 to your /etc/mail/virtusertable since otherwise sendmail will reject
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200 that message.
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201 </para>
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202 </refsect1>
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203
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204 <refsect1 id='dcc.1'>
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205 <title>DCC Issues</title>
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206 <para>
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207 If you are also using the <ulink
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208 url="http://www.rhyolite.com/anti-spam/dcc/">DCC</ulink> milter, there
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209 are a few considerations. You may need to whitelist senders from the
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210 DCC bulk detector, or from the DNS based lists. Those are two very
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211 different reasons for whitelisting. The former is done thru the DCC
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212 whiteclnt config file, the later is done thru the DNSBL milter config
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213 file.
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214 </para>
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215 <para>
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216 You may want to blacklist some specific senders or sending domains.
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217 This could be done thru either the DCC (on a global basis, or for a
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218 specific single recipient). We prefer to do such blacklisting via the
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219 DNSBL milter config, since it can be done for a collection of recipient
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220 mail domains. The DCC approach has the feature that you can capture the
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221 entire message in the DCC log files. The DNSBL milter approach has the
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222 feature that the mail is rejected earlier (at RCPT TO time), and the
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223 sending machine just gets a generic "550 5.7.1 no such user" message.
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224 </para>
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225 <para>
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226 The DCC whiteclnt file can be included in the DNSBL milter config by the
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227 dcc_to and dcc_from statements. This will import the (env_to, env_from,
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228 and substitute mail_host) entries from the DCC config into the DNSBL
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229 config. This allows using the DCC config as the single point for
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230 white/blacklisting.
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231 </para>
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232 <para>
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233 Consider the case where you have multiple clients, each with their own
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234 mail servers, and each running their own DCC milters. Each client is
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235 using the DCC facilities for envelope from/to white/blacklisting.
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236 Presumably you can use rsync or scp to fetch copies of your clients DCC
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237 whiteclnt files on a regular basis. Your mail server, acting as a
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238 backup MX for your clients, can use the DNSBL milter, and include those
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239 client DCC config files. The envelope from/to white/blacklisting will
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240 be appropriately tagged and used only for the domains controlled by each
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241 of those clients.
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242 </para>
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243 </refsect1>
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244
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245 <refsect1 id='definitions.1'>
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246 <title>Definitions</title>
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247 <para>
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248 CONTEXT - a collection of parameters that defines the filtering context
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249 to be used for a collection of envelope recipient addresses. The
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250 context includes such things as the list of DNSBLs to be used, and the
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251 various content filtering parameters.
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252 </para>
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253 <para>
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254 DNSBL - a named DNS based blocking list is defined by a dns suffix (e.g.
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255 sbl-xbl.spamhaus.org) and a message string that is used to generate the
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256 "550 5.7.1" smtp error return code. The names of these DNSBLs will be
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257 used to define the DNSBL-LISTs.
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258 </para>
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259 <para>
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260 DNSBL-LIST - a named list of DNSBLs that will be used for specific
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261 recipients or recipient domains.
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262 </para>
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263 </refsect1>
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264
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265 <refsect1 id='filtering.1'>
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266 <title>Filtering Procedure</title>
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267 <para>
152
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268 The SMTP envelope 'from' and 'to' values are used in various checks.
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269 The first check is to see if a reply message (swapping the env_from and
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270 env_to values) would be unconditionally blocked (just based on the
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271 envelope from address). That check is similar to the main check
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272 described below, but there is no body content to be scanned, and there
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273 is no client connection ip address to be checked against DNSBLs. If
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274 such a reply message would be blocked, we also block the original
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275 outgoing message. This prevents folks from sending mail to recipients
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276 that are unable to reply.
152
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277 </para>
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278 <para>
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279 If the client has authenticated with sendmail, the rate limits are
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280 checked. If the authenticated user has not exceeded the hourly rate
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281 limit, then the mail is accepted, the filtering contexts are not used,
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282 the dns lists are not checked, and the body content is not scanned. If
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283 the client has not authenticated with sendmail, we follow these steps
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284 for each recipient.
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285 </para>
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286 <orderedlist>
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287 <listitem><para>
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288 The envelope to email address is used to find an initial filtering
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289 context. We first look for a context that specified the full email
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290 address in the env_to statement. If that is not found, we look for a
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291 context that specified the entire domain name of the envelope recipient
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292 in the env_to statement. If that is not found, we look for a context
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293 that specified the user@ part of the envelope recipient in the env_to
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294 statement. If that is not found, we use the first top level context
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295 defined in the config file.
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296 </para></listitem>
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297 <listitem><para>
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298 The initial filtering context may redirect to a child context based on
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299 the values in the initial context's env_from statement. We look for [1)
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300 the full envelope from email address, 2) the domain name part of the
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301 envelope from address, 3) the user@ part of the envelope from address]
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302 in that context's env_from statement, with values that point to a child
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303 context. If such an entry is found, we switch to that child filtering
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304 context.
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305 </para></listitem>
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306 <listitem><para>
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307 We lookup [1) the full envelope from email address, 2) the domain name
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308 part of the envelope from address, 3) the user@ part of the envelope
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309 from address] in the filtering context env_from statement. That results
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310 in one of (white, black, unknown, inherit).
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311 </para></listitem>
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312 <listitem><para>
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313 If the answer is black, mail to this recipient is rejected with "no such
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314 user", and the dns lists are not checked.
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315 </para></listitem>
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316 <listitem><para>
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317 If the answer is white, mail to this recipient is accepted and the dns
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318 lists are not checked.
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319 </para></listitem>
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320 <listitem><para>
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321 If the answer is unknown, we don't reject yet, but the dns lists will be
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322 checked, and the content may be scanned.
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323 </para></listitem>
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324 <listitem><para>
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325 If the answer is inherit, we repeat the envelope from search in the
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326 parent context.
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327 </para></listitem>
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328 <listitem><para>
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329 The dns lists specified in the filtering context are checked and the
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330 mail is rejected if any list has an A record for the standard dns based
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331 lookup scheme (reversed octets of the client followed by the dns
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332 suffix).
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333 </para></listitem>
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334 <listitem><para>
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335 If the mail has not been accepted or rejected yet, we look for a
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336 verification context, which is the closest ancestor of the filtering
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337 context that both specifies a verification host, and which covers the
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338 envelope to address. If we find such a verification context, and the
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339 verification host is not our own hostname, we open an smtp conversation
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340 with that verification host. The current envelope from and recipient to
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341 values are passed to that verification host. If we receive a 5xy
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342 response those commands, we reject the current recipient with "no such
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343 user".
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344 </para></listitem>
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345 <listitem><para>
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346 If the mail has not been accepted or rejected yet, and the filtering
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347 context enables content filtering, and this is the first such recipient
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348 in this smtp transaction, we set the content filtering parameters from
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349 this context, and enable content filtering for the body of this message.
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350 </para></listitem>
108
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351 </orderedlist>
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352 <para>
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353 For each recipient that was accepted, we search for an autowhite entry
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354 starting in the reply filtering context. If an autowhite entry is found,
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355 we add the recipient to that auto whitelist file. This will prevent reply
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356 messages from being blocked by the dnsbl or content filtering.
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357 </para>
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358 <para>
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359 If content filtering is enabled for this body, the mail text is decoded
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360 (uuencode, base64, mime, html entity, url encodings), and scanned for HTTP
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361 and HTTPS URLs or bare host names. Hostnames must be either ip address
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362 literals, or must end in a string defined by the TLD list. The first
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363 &lt;configurable&gt; host names are checked as follows.
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364 </para>
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365 <para>
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366 The only known list that is suitable for the content filter DNSBL is the
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367 SBL. If the content filter DNSBL is defined, and any of those host
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368 names resolve to ip addresses that are on that DNSBL (or have
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369 nameservers that are on that list), and the host name is not on the
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370 &lt;configurable&gt; ignore list, the mail is rejected.
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371 </para>
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372 <para>
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373 If the content uribl DNSBL is defined, and any of those host names are
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374 on that DNSBL, and the host name is not on the &lt;configurable&gt;
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375 ignore list, the mail is rejected.
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376 </para>
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377 <para>
163
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378 If the spamassassin limit for this filtering context is non-zero, the
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379 message is passed thru spamassassin (via spamc) and if the resulting
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380 score is larger than this limit, the mail is rejected.
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381 </para>
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382 <para>
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383 We also scan for excessive bad html tags, and if a &lt;configurable&gt;
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384 limit is exceeded, the mail is rejected.
108
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385 </para>
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386 </refsect1>
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387
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388 <refsect1 id='access.1'>
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389 <title>Sendmail access vs. DNSBL</title>
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390 <para>
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391 With the standard sendmail.mc dnsbl FEATURE, the dnsbl checks may be
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392 suppressed by entries in the /etc/mail/access database. For example,
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393 suppose you control a /18 of address space, and have allocated some /24s
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394 to some clients. You have access entries like
111
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395 <literallayout class="monospaced"><![CDATA[
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396 192.168.4 OK
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397 192.168.17 OK]]></literallayout>
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398 </para>
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399 <para>
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400 to allow those clients to smarthost thru your mail server. Now if one
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401 of those clients happens get infected with a virus that turns a machine
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402 into an open proxy, and their 192.168.4.45 lands on the SBL-XBL, you
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403 will still wind up allowing that infected machine to smarthost thru your
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404 mail servers.
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405 </para>
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406 <para>
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407 With this DNSBL milter, the sendmail access database cannot override the
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408 dnsbl checks, so that machine won't be able to send mail to or thru your
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409 smarthost mail server (unless the virus/proxy can use smtp-auth).
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410 </para>
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411 <para>
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412 Using the standard sendmail features, you would add access entries to
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413 allow hosts on your local network to relay thru your mail server. Those
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414 OK entries in the sendmail access database will override all the dnsbl
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415 checks. With this DNSBL milter, you will need to have the local users
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416 authenticate with smtp-auth to get the same effect. You might find
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417 <ulink
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418 url="http://www.ists.dartmouth.edu/classroom/sendmail-ssl-how-to.php">
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419 these directions</ulink> helpful for setting up smtp-auth if you are on
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420 RH Linux.
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421 </para>
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422 </refsect1>
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423
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424 <refsect1 id='performance.1'>
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425 <title>Performance Issues</title>
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426 <para>
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427 Consider a high volume high performance machine running sendmail. Each
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428 sendmail process can do its own dns resolution. Typically, such dns
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429 resolver libraries are not thread safe, and so must be protected by some
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430 sort of mutex in a threaded environment. When we add a milter to
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431 sendmail, we now have a collection of sendmail processes, and a
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432 collection of milter threads.
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433 </para>
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434 <para>
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435 We will be doing a lot of dns lookups per mail message, and at least
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436 some of those will take many tens of seconds. If all this dns work is
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437 serialized inside the milter, we have an upper limit of about 25K mail
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438 messages per day. That is clearly not sufficient for many sites.
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439 </para>
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440 <para>
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441 Since we want to do parallel dns resolution across those milter threads,
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442 we add another collection of dns resolver processes. Each sendmail
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443 process is talking to a milter thread over a socket, and each milter
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444 thread is talking to a dns resolver process over another socket.
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445 </para>
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446 <para>
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447 Suppose we are processing 20 messages per second, and each message
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448 requires 20 seconds of dns work. Then we will have 400 sendmail
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449 processes, 400 milter threads, and 400 dns resolver processes. Of
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450 course that steady state is very unlikely to happen.
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451 </para>
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452 </refsect1>
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453
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454
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455 <refsect1 id='rejected.1'>
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456 <title>Rejected Ideas</title>
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457 <para>
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458 The following ideas have been considered and rejected.
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459 </para>
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460 <para>
111
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461 Add max_recipients setting to the context configuration. Recipients in
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462 excess of that limit will be rejected, and all the non-whitelisted
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463 recipients will be removed. Current spammers *very* rarely send more
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464 than ten recipients in a single smtp transaction, so this won't stop any
108
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465 significant amount of spam.
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466 </para>
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467 <para>
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468 Add poison addresses to the configuration. If any recipient is
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469 poison, all recipients are rejected even if they would be whitelisted,
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470 and the data is rejected if sent. I have a collection of spam trap
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471 addresses that would be suitable for such use. Based on my log files,
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472 any mail to those spam trap addresses is rejected based on either dnsbl
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473 lookups or the DCC. So this won't result in blocking any additional
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474 spam.
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475 </para>
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476 <para>
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477 Add an option to only allow one recipient if the return path is
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478 empty. Based on my log files, there is no mail that violates this
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479 check.
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480 </para>
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481 <para>
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482 Reject the mail if the envelope from domain name contains any MX
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diff changeset
483 records pointing to 127.0.0.0/8. I don't see any significant amount of
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484 spam sent with such domain names.
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485 </para>
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486 </refsect1>
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487
108
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diff changeset
488 <refsect1 id='todo.1'>
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489 <title>TODO</title>
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490 <para>
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491 The following ideas are under consideration.
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492 </para>
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493 <para>
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diff changeset
494 Add a per-context option to reject mail if the number of digits in
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diff changeset
495 the reverse dns client name exceeds some threshold.
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496 </para>
115
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497 <para>
07e5d4721213 use larger resolver buffer
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diff changeset
498 Look for href="hostname/path" strings that are missing the required
07e5d4721213 use larger resolver buffer
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diff changeset
499 http:// protocol header. Such references are still clickable in common
07e5d4721213 use larger resolver buffer
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diff changeset
500 mail software.
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diff changeset
501 </para>
108
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502 </refsect1>
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503
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504 <refsect1 id='copyright.1'>
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505 <title>Copyright</title>
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506 <para>
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507 Copyright (C) 2007 by 510 Software Group &lt;carl@five-ten-sg.com&gt;
108
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508 </para>
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509 <para>
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diff changeset
510 This program is free software; you can redistribute it and/or modify it
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diff changeset
511 under the terms of the GNU General Public License as published by the
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diff changeset
512 Free Software Foundation; either version 3, or (at your option) any
108
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diff changeset
513 later version.
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diff changeset
514 </para>
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diff changeset
515 <para>
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diff changeset
516 You should have received a copy of the GNU General Public License along
1c7677042b78 move to autoconf/automake/docbook
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diff changeset
517 with this program; see the file COPYING. If not, please write to the
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diff changeset
518 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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diff changeset
519 </para>
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diff changeset
520 </refsect1>
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diff changeset
521
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diff changeset
522 <refsect1 id='version.1'>
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diff changeset
523 <title>CVS Version</title>
108
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diff changeset
524 <para>
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diff changeset
525 $Id$
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diff changeset
526 </para>
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diff changeset
527 </refsect1>
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diff changeset
528 </refentry>
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parents: 104
diff changeset
529
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parents: 104
diff changeset
530
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parents: 104
diff changeset
531 <refentry id="@PACKAGE@.conf.5">
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diff changeset
532 <refentryinfo>
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diff changeset
533 <date>2007-07-26</date>
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diff changeset
534 </refentryinfo>
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parents: 92
diff changeset
535
108
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parents: 104
diff changeset
536 <refmeta>
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diff changeset
537 <refentrytitle>@PACKAGE@.conf</refentrytitle>
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parents: 104
diff changeset
538 <manvolnum>5</manvolnum>
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parents: 104
diff changeset
539 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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diff changeset
540 </refmeta>
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diff changeset
541
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parents: 104
diff changeset
542 <refnamediv id='name.5'>
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diff changeset
543 <refname>@PACKAGE@.conf</refname>
111
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parents: 108
diff changeset
544 <refpurpose>configuration file for @PACKAGE@ sendmail milter</refpurpose>
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diff changeset
545 </refnamediv>
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parents: 104
diff changeset
546
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parents: 104
diff changeset
547 <refsynopsisdiv id='synopsis.5'>
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parents: 104
diff changeset
548 <title>Synopsis</title>
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parents: 104
diff changeset
549 <cmdsynopsis>
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carl
parents: 104
diff changeset
550 <command>@PACKAGE@.conf</command>
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parents: 104
diff changeset
551 </cmdsynopsis>
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diff changeset
552 </refsynopsisdiv>
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553
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parents: 104
diff changeset
554 <refsect1 id='description.5'>
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parents: 104
diff changeset
555 <title>Description</title>
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556 <para>The <command>@PACKAGE@.conf</command> configuration file is
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parents: 144
diff changeset
557 specified by this partial bnf description. Comments start with //
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parents: 144
diff changeset
558 or # and extend to the end of the line. To include the contents
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parents: 144
diff changeset
559 of some file verbatim in the dnsbl.conf file, use
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parents: 144
diff changeset
560 <literallayout class="monospaced"><![CDATA[include "<file>";]]></literallayout>
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561 </para>
108
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parents: 104
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562
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parents: 104
diff changeset
563 <literallayout class="monospaced"><![CDATA[
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diff changeset
564 CONFIG = {CONTEXT ";"}+
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diff changeset
565 CONTEXT = "context" NAME "{" {STATEMENT}+ "}"
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parents: 152
diff changeset
566 STATEMENT = (DNSBL | DNSBLLIST | CONTENT | ENV-TO | VERIFY |
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parents: 152
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567 AUTOWHITE | CONTEXT | ENV-FROM | RATE-LIMIT) ";"
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parents: 104
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568
124
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diff changeset
569 DNSBL = "dnsbl" NAME DNSPREFIX ERROR-MSG1
108
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parents: 104
diff changeset
570
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diff changeset
571 DNSBLLIST = "dnsbl_list" {NAME}+
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parents: 92
diff changeset
572
108
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parents: 104
diff changeset
573 CONTENT = "content" ("on" | "off") "{" {CONTENT-ST}+ "}"
119
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parents: 115
diff changeset
574 CONTENT-ST = (FILTER | URIBL | IGNORE | TLD | CCTLD | HTML-TAGS |
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parents: 162
diff changeset
575 HTML-LIMIT | HOST-LIMIT | SPAMASS) ";"
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parents: 162
diff changeset
576 SPAMASS = "spamassassin" INTEGER
124
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parents: 122
diff changeset
577 FILTER = "filter" DNSPREFIX ERROR-MSG2
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parents: 122
diff changeset
578 URIBL = "uribl" DNSPREFIX ERROR-MSG3
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diff changeset
579 IGNORE = "ignore" "{" {HOSTNAME [";"]}+ "}"
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parents: 104
diff changeset
580 TLD = "tld" "{" {TLD [";"]}+ "}"
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parents: 115
diff changeset
581 CCTLD = "cctld" "{" {TLD [";"]}+ "}"
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diff changeset
582 HTML-TAGS = "html_tags" "{" {HTMLTAG [";"]}+ "}"
124
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parents: 122
diff changeset
583 ERROR-MSG1 = string containing exactly two %s replacement tokens
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parents: 122
diff changeset
584 both are replaced with the client ip address
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parents: 122
diff changeset
585 ERROR-MSG2 = string containing exactly two %s replacement tokens
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parents: 122
diff changeset
586 the first is replaced with the hostname, and the second
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parents: 122
diff changeset
587 is replaced with the ip address
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parents: 122
diff changeset
588 ERROR-MSG3 = string containing exactly two %s replacement tokens
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parents: 122
diff changeset
589 both are replaced with the hostname
108
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parents: 104
diff changeset
590
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parents: 104
diff changeset
591 HTML-LIMIT = "html_limit" ("on" INTEGER ERROR-MSG | "off")
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parents: 104
diff changeset
592
111
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parents: 108
diff changeset
593 HOST-LIMIT = "host_limit" ("on" INTEGER ERROR-MSG | "off" |
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parents: 108
diff changeset
594 "soft" INTEGER)
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parents: 92
diff changeset
595
108
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parents: 104
diff changeset
596 ENV-TO = "env_to" "{" {(TO-ADDR | DCC-TO)}+ "}"
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parents: 104
diff changeset
597 TO-ADDR = ADDRESS [";"]
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parents: 104
diff changeset
598 DCC-TO = "dcc_to" ("ok" | "many") "{" DCCINCLUDEFILE "}" ";"
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parents: 104
diff changeset
599
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parents: 104
diff changeset
600 VERIFY = "verify" HOSTNAME ";"
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parents: 152
diff changeset
601 AUTOWHITE = "autowhite" DAYS FILENAME ";"
108
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parents: 104
diff changeset
602
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parents: 104
diff changeset
603 ENV_FROM = "env_from" [DEFAULT] "{" {(FROM-ADDR | DCC-FROM)}+ "}"
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parents: 104
diff changeset
604 FROM-ADDR = ADDRESS VALUE [";"]
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parents: 104
diff changeset
605 DCC-FROM = "dcc_from" "{" DCCINCLUDEFILE "}" ";"
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parents: 127
diff changeset
606
140
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diff changeset
607 RATE-LIMIT = "rate_limit" [DEFAULTLIMIT] "{" (RATE)+ "}"
136
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parents: 127
diff changeset
608 RATE = USER LIMIT [";"]
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parents: 127
diff changeset
609
108
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parents: 104
diff changeset
610 DEFAULT = ("white" | "black" | "unknown" | "inherit" | "")
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diff changeset
611 ADDRESS = (USER@ | DOMAIN | USER@DOMAIN)
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diff changeset
612 VALUE = ("white" | "black" | "unknown" | "inherit" | CHILD-CONTEXT-NAME)]]></literallayout>
108
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parents: 104
diff changeset
613 </refsect1>
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parents: 92
diff changeset
614
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parents: 104
diff changeset
615 <refsect1 id='sample.5'>
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parents: 104
diff changeset
616 <title>Sample</title>
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diff changeset
617 <literallayout class="monospaced"><![CDATA[
127
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618 context main-default {
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parents: 124
diff changeset
619 // outbound dnsbl filtering to catch our own customers that end up on the sbl
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parents: 140
diff changeset
620 dnsbl localp partial.blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
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diff changeset
621 dnsbl local blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
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parents: 124
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622 dnsbl sbl sbl-xbl.spamhaus.org "Mail from %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
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diff changeset
623 dnsbl dul dul.dnsbl.sorbs.net "Mail from %s rejected - dul; see http://www.sorbs.net/lookup.shtml?%s";
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parents: 124
diff changeset
624 dnsbl_list local sbl dul;
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parents: 124
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625
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carl
parents: 124
diff changeset
626 // outbound content filtering to prevent our own customers from sending spam
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parents: 124
diff changeset
627 content on {
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628 filter sbl-xbl.spamhaus.org "Mail containing %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
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diff changeset
629 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.rulesemporium.com/cgi-bin/uribl.cgi?bl0=1&domain0=%s";
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630 #uribl black.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
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parents: 124
diff changeset
631 ignore { include "hosts-ignore.conf"; };
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632 tld { include "tld.conf"; };
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parents: 124
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633 cctld { include "cctld.conf"; };
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parents: 124
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634 html_tags { include "html-tags.conf"; };
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parents: 124
diff changeset
635 html_limit on 20 "Mail containing excessive bad html tags rejected";
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parents: 124
diff changeset
636 html_limit off;
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parents: 124
diff changeset
637 host_limit on 20 "Mail containing excessive host names rejected";
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parents: 124
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638 host_limit soft 20;
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parents: 124
diff changeset
639 };
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parents: 124
diff changeset
640
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diff changeset
641 // backscatter prevention - don't send bounces for mail that we accepted but could not forward
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642 // we only send bounces to our own customers
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diff changeset
643 env_from unknown {
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parents: 124
diff changeset
644 "<>" black;
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645 };
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parents: 127
diff changeset
646
144
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parents: 140
diff changeset
647 // hourly recipient rate limit by smtp auth client id
140
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parents: 136
diff changeset
648 rate_limit 30 { // default
136
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diff changeset
649 fred 100; // override default limits
140
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parents: 136
diff changeset
650 joe 10; // ""
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diff changeset
651 };
127
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diff changeset
652 };
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parents: 124
diff changeset
653
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parents: 104
diff changeset
654 context sample {
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parents: 104
diff changeset
655 dnsbl local blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
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parents: 104
diff changeset
656 dnsbl sbl sbl-xbl.spamhaus.org "Mail from %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
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diff changeset
657 dnsbl xbl xbl.spamhaus.org "Mail from %s rejected - xbl; see http://www.spamhaus.org/query/bl?ip=%s";
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parents: 104
diff changeset
658 dnsbl dul dul.dnsbl.sorbs.net "Mail from %s rejected - dul; see http://www.sorbs.net/lookup.shtml?%s";
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parents: 104
diff changeset
659 dnsbl_list local sbl dul;
94
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parents: 92
diff changeset
660
108
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parents: 104
diff changeset
661 content on {
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parents: 104
diff changeset
662 filter sbl-xbl.spamhaus.org "Mail containing %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
122
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diff changeset
663 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.rulesemporium.com/cgi-bin/uribl.cgi?bl0=1&domain0=%s";
119
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parents: 115
diff changeset
664 #uribl black.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
108
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parents: 104
diff changeset
665 ignore { include "hosts-ignore.conf"; };
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parents: 104
diff changeset
666 tld { include "tld.conf"; };
119
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parents: 115
diff changeset
667 cctld { include "cctld.conf"; };
108
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parents: 104
diff changeset
668 html_tags { include "html-tags.conf"; };
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parents: 104
diff changeset
669 html_limit on 20 "Mail containing excessive bad html tags rejected";
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parents: 104
diff changeset
670 html_limit off;
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parents: 104
diff changeset
671 host_limit on 20 "Mail containing excessive host names rejected";
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parents: 104
diff changeset
672 host_limit soft 20;
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diff changeset
673 };
94
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carl
parents: 92
diff changeset
674
108
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carl
parents: 104
diff changeset
675 env_to {
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parents: 104
diff changeset
676 # child contexts are not allowed to specify recipient addresses outside these domains
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parents: 104
diff changeset
677 # leave this outer global context env_to empty to allow arbitrary recipients in child contexts
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parents: 104
diff changeset
678 mydomain.com;
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carl
parents: 104
diff changeset
679 customer1.com;
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carl
parents: 104
diff changeset
680 customer1a.com;
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carl
parents: 104
diff changeset
681 customer1b.com;
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carl
parents: 104
diff changeset
682 customer2.com;
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carl
parents: 104
diff changeset
683 customer2a.com;
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parents: 104
diff changeset
684 customer2b.com;
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parents: 104
diff changeset
685 };
94
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carl
parents: 92
diff changeset
686
108
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carl
parents: 104
diff changeset
687 context whitelist {
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carl
parents: 104
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688 content off {};
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carl
parents: 104
diff changeset
689 env_to {
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parents: 104
diff changeset
690 # dcc_to ok { include "/var/dcc/whitecommon"; }; # copy the dcc OK values (env_to) into this context
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carl
parents: 104
diff changeset
691 };
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parents: 104
diff changeset
692 env_from white {}; # white forces all unmatched from addresses (everyone in this case) to be whitelisted
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carl
parents: 104
diff changeset
693 # so all mail TO these env_to addresses is accepted
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parents: 104
diff changeset
694 };
94
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carl
parents: 92
diff changeset
695
108
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carl
parents: 104
diff changeset
696 context minimal {
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carl
parents: 104
diff changeset
697 dnsbl_list sbl dul;
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carl
parents: 104
diff changeset
698 content on {};
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carl
parents: 104
diff changeset
699 env_to {
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carl
parents: 104
diff changeset
700 sales@mydomain.com;
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carl
parents: 104
diff changeset
701 };
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parents: 104
diff changeset
702 };
94
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carl
parents: 92
diff changeset
703
108
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carl
parents: 104
diff changeset
704 context blacklist {
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carl
parents: 104
diff changeset
705 env_to {
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parents: 104
diff changeset
706 dcc_to many { include "/var/dcc/whitecommon"; }; # copy the dcc MANY values (env_to) into this context
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carl
parents: 104
diff changeset
707 old-employee@mydomain.com;
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carl
parents: 104
diff changeset
708 };
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carl
parents: 104
diff changeset
709 env_from black {}; # black forces all unmatched from addresses (everyone in this case) to be blacklisted
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carl
parents: 104
diff changeset
710 # so all mail TO these env_to addresses is rejected
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carl
parents: 104
diff changeset
711 };
94
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carl
parents: 92
diff changeset
712
108
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carl
parents: 104
diff changeset
713 context vp { # special context for the vp
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carl
parents: 104
diff changeset
714 env_to {
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carl
parents: 104
diff changeset
715 vp@mydomain.com;
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carl
parents: 104
diff changeset
716 };
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carl
parents: 104
diff changeset
717 env_from inherit {
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carl
parents: 104
diff changeset
718 nai.com black; # the vp does not like nai
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carl
parents: 104
diff changeset
719 yahoo.com unknown; # override parent context blacklisting
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carl
parents: 104
diff changeset
720 mother@spammyisp.com white; # suppress dnsbl checking
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carl
parents: 104
diff changeset
721 };
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carl
parents: 104
diff changeset
722 };
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carl
parents: 104
diff changeset
723
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carl
parents: 104
diff changeset
724 context customer1 {
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carl
parents: 104
diff changeset
725 dnsbl_list sbl dul;
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carl
parents: 104
diff changeset
726 env_to {
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carl
parents: 104
diff changeset
727 customer1.com;
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carl
parents: 104
diff changeset
728 customer1a.com;
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carl
parents: 104
diff changeset
729 customer1b.com;
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parents: 104
diff changeset
730 };
94
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carl
parents: 92
diff changeset
731
153
8d7c439bb6fa add auto whitelisting
carl
parents: 152
diff changeset
732 # we can reject unknown users
108
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carl
parents: 104
diff changeset
733 verify mail.customer1.com;
94
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carl
parents: 92
diff changeset
734
153
8d7c439bb6fa add auto whitelisting
carl
parents: 152
diff changeset
735 # whitelist anyone to whom we have sent mail in the last 90 days
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carl
parents: 152
diff changeset
736 autowhite 90 "autowhite/customer1";
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carl
parents: 152
diff changeset
737
108
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carl
parents: 104
diff changeset
738 context customer1a {
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carl
parents: 104
diff changeset
739 env_to {
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parents: 104
diff changeset
740 customer1a.com;
148
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
741 };
108
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parents: 104
diff changeset
742 env_from black { # blacklist everything
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parents: 104
diff changeset
743 first@acceptable.com unknown; # except these specific envelope senders
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carl
parents: 104
diff changeset
744 second@another.com unknown;
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parents: 104
diff changeset
745 yahoo.com inherit; # delegate to the parent
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parents: 104
diff changeset
746 };
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carl
parents: 104
diff changeset
747 };
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parents: 104
diff changeset
748
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parents: 104
diff changeset
749 env_from { # default value of the default is inherit
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carl
parents: 104
diff changeset
750 yahoo.com black; # no mail from yahoo
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carl
parents: 104
diff changeset
751 first@yahoo.com unknown; # except this one
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carl
parents: 104
diff changeset
752 };
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parents: 104
diff changeset
753 };
94
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parents: 92
diff changeset
754
108
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parents: 104
diff changeset
755 context customer2 {
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carl
parents: 104
diff changeset
756 dnsbl_list sbl;
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carl
parents: 104
diff changeset
757 env_to {
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carl
parents: 104
diff changeset
758 customer2.com;
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carl
parents: 104
diff changeset
759 customer2a.com;
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carl
parents: 104
diff changeset
760 customer2b.com;
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carl
parents: 104
diff changeset
761 };
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carl
parents: 104
diff changeset
762 };
104
586d5b58040a move to autoconf/automake/docbook
carl
parents: 103
diff changeset
763
149
9581f6e62574 switch to second context wins in all cases
carl
parents: 148
diff changeset
764 # this is at the end, so that these abuse@ and postmaster@ entries will
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carl
parents: 148
diff changeset
765 # override any conflicting entries inside the customer contexts.
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carl
parents: 148
diff changeset
766 context abuse {
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carl
parents: 148
diff changeset
767 dnsbl_list xbl;
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carl
parents: 148
diff changeset
768 content off {};
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carl
parents: 148
diff changeset
769 env_to {
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carl
parents: 148
diff changeset
770 abuse@; # no content filtering on abuse reports
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carl
parents: 148
diff changeset
771 postmaster@; # ""
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carl
parents: 148
diff changeset
772 };
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carl
parents: 148
diff changeset
773 env_from unknown {}; # ignore all parent white/black listing
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carl
parents: 148
diff changeset
774 };
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parents: 148
diff changeset
775
108
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parents: 104
diff changeset
776 env_from unknown {
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parents: 104
diff changeset
777 dcc_from { include "/var/dcc/whitecommon"; }; # copy the dcc OK/MANY values (env_from, substitute mail_host) into this context
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carl
parents: 104
diff changeset
778 abuse@ abuse; # replies to abuse reports use the abuse context
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parents: 104
diff changeset
779 yahoo.com black; # don't take mail from yahoo
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parents: 104
diff changeset
780 spammer@example.com black;
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carl
parents: 104
diff changeset
781 };
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parents: 104
diff changeset
782 };]]></literallayout>
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parents: 104
diff changeset
783 </refsect1>
94
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carl
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diff changeset
784
111
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carl
parents: 108
diff changeset
785 <refsect1 id='version.5'>
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carl
parents: 108
diff changeset
786 <title>CVS Version</title>
108
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carl
parents: 104
diff changeset
787 <para>
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carl
parents: 104
diff changeset
788 $Id$
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parents: 104
diff changeset
789 </para>
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parents: 104
diff changeset
790 </refsect1>
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carl
parents: 104
diff changeset
791
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carl
parents: 104
diff changeset
792 </refentry>
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carl
parents: 104
diff changeset
793 </reference>