annotate xml/syslog2iptables.in @ 46:4eaee1fcffa7 stable-1-10

more fixes for Solaris
author Carl Byington <carl@five-ten-sg.com>
date Sat, 22 Mar 2008 11:32:28 -0700
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1 <reference>
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2 <title>@PACKAGE@</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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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>2008-03-21</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 simple adaptive firewall</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>-d <replaceable class="parameter">n</replaceable></option></arg>
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42 </cmdsynopsis>
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43 </refsynopsisdiv>
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44
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45 <refsect1 id='description.1'>
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46 <title>Description</title>
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47
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48 <para><command>@PACKAGE@</command> is a simple adaptive firewall. It
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49 maintains the INPUT chain of the <citerefentry>
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50 <refentrytitle>iptables</refentrytitle> <manvolnum>1</manvolnum>
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51 </citerefentry> firewall set based on syslog entries. These syslog
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52 entries are typically generated by your hardware firewall, but they
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53 could come from any source. Any syslog entry that contains a host name
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54 or ip address can be used as input to this package.</para>
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55
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56 <para>The <citerefentry> <refentrytitle>@PACKAGE@.conf</refentrytitle>
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57 <manvolnum>5</manvolnum> </citerefentry> file specifies the syslog files
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58 to be monitored, and the regular expressions (<citerefentry>
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59 <refentrytitle>regex</refentrytitle> <manvolnum>7</manvolnum>
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60 </citerefentry>) to be applied to new lines in those files. Each
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61 regular expression needs an index to specify the matching substring that
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62 contains either an ip address or host name, and a bucket count which is
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63 added to the leaky bucket for that ip address when a matching line is
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64 read from that syslog file.</para>
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65
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66 <para>Each ip address has an associated leaky bucket, which leaks one
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67 token per second. Once the bucket contains more than a configurable
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68 threshold number of tokens, that ip address is added to the INPUT chain
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69 with a DROP target. When the bucket is drained to zero, that ip address
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70 is removed from the INPUT chain.</para>
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71
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72 <para>The discussion has focused on syslog files, but any ascii text
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73 file can be used, so long as some other process appends lines to that
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74 file, and those lines containing hostname or ip addresses can be matched
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75 with some regular expression.</para>
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76
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77 <para>Considering syslog files in particular, these are normally rotated
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78 via logrotate. <command>@PACKAGE@</command> properly detects and
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79 handles this case by closing the old file, and reopening the newly
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80 created file.</para>
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81 </refsect1>
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82
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83 <refsect1 id='options.1'>
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84 <title>Options</title>
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85 <variablelist>
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86 <varlistentry>
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87 <term>-c</term>
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88 <listitem>
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89 <para>
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90 Load the configuration file, print a cannonical form
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91 of the configuration on stdout, and exit.
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92 </para>
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93 </listitem>
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94 </varlistentry>
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95 <varlistentry>
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96 <term>-d <replaceable class="parameter">n</replaceable></term>
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97 <listitem>
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98 <para>
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99 Set the debug level to <replaceable class="parameter">n</replaceable>.
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100 </para>
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101 </listitem>
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102 </varlistentry>
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103 </variablelist>
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104 </refsect1>
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105
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106 <refsect1 id='usage.1'>
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107 <title>Usage</title>
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108 <para><command>@PACKAGE@</command> -d 2</para>
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109 </refsect1>
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110
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111 <refsect1 id='configuration.1'>
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112 <title>Configuration</title>
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113 <para>
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114 The configuration file is documented in <citerefentry>
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115 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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116 </citerefentry>. Any change to the config file will cause it to be
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117 reloaded within three minutes.
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118 </para>
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119 </refsect1>
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120
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121 <refsect1 id='todo.1'>
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122 <title>TODO</title>
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123 <para>
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124 The following ideas are under consideration.
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125 </para>
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126 <para>
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127 Add a configuration option for the iptables table name in the
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128 pattern statement. This implies handling multiple tables, so each
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129 table needs its own map of ip addresses and bucket values.
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130 </para>
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131 </refsect1>
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132
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133 <refsect1 id='copyright.1'>
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134 <title>Copyright</title>
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135 <para>
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136 Copyright (C) 2007 by 510 Software Group &lt;carl@five-ten-sg.com&gt;
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137 </para>
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138 <para>
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139 This program is free software; you can redistribute it and/or modify it
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140 under the terms of the GNU General Public License as published by the
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141 Free Software Foundation; either version 3, or (at your option) any
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142 later version.
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143 </para>
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144 <para>
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145 You should have received a copy of the GNU General Public License along
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146 with this program; see the file COPYING. If not, please write to the
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147 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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148 </para>
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149 </refsect1>
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150
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151 <refsect1 id='version.1'>
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152 <title>Version</title>
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153 <para>
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154 @VERSION@
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155 </para>
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156 </refsect1>
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157 </refentry>
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158
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159
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160 <refentry id="@PACKAGE@.conf.5">
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161 <refentryinfo>
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162 <date>2008-03-21</date>
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163 </refentryinfo>
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164
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165 <refmeta>
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166 <refentrytitle>@PACKAGE@.conf</refentrytitle>
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167 <manvolnum>5</manvolnum>
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168 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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169 </refmeta>
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170
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171 <refnamediv id='name.5'>
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172 <refname>@PACKAGE@.conf</refname>
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173 <refpurpose>configuration file for @PACKAGE@</refpurpose>
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174 </refnamediv>
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175
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176 <refsynopsisdiv id='synopsis.5'>
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177 <title>Synopsis</title>
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178 <cmdsynopsis>
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179 <command>@PACKAGE@.conf</command>
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180 </cmdsynopsis>
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181 </refsynopsisdiv>
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182
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183 <refsect1 id='description.5'>
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184 <title>Description</title>
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185 <para>The <command>@PACKAGE@.conf</command> configuration file is
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186 specified by this partial bnf description. The entire config file
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187 is case sensitive. All the keywords are lower case.
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188 </para>
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189
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190 <literallayout class="monospaced"><![CDATA[
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191 CONFIG := {THRESHOLD | ADD-CMD | REM-CMD | IGNORE | FILE}+
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192 THRESHOLD := "threshold" THRESHOLD-INTEGER-VALUE ";"
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193 ADD-CMD := "add_command" IPT-CMD ";"
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194 REM-CMD := "remove_command" IPT-CMD ";"
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195 IGNORE := "ignore" "{" IG-SINGLE+ "};"
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196 IG-SINGLE := IP-ADDRESS "/" CIDR-BITS ";"
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197 FILE := "file" FILENAME "{" PATTERN+ "};"
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198 PATTERN := "pattern" REGULAR-EXPRESSION "{" {INDEX | BUCKET | MESSAGE}+ "};"
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199 INDEX := "index" REGEX-INTEGER-VALUE ";"
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200 BUCKET := "bucket" BUCKET-ADD-INTEGER-VALUE ";"
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201 MESSAGE := "message" REASON ";"
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202 REASON := string to appear in syslog messages
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203 IPT-CMD := string containing exactly one %s replacement token for
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204 the ip address]]></literallayout>
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205 </refsect1>
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206
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207 <refsect1 id='sample.5'>
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208 <title>Sample</title>
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209 <literallayout class="monospaced"><![CDATA[
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210 threshold 550;
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211
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212 add_command "/sbin/iptables -I INPUT --src %s --jump DROP";
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213 remove_command "/sbin/iptables -D INPUT --src %s --jump DROP";
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214
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215 ignore {
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216 127.0.0.0/8; // localhost
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217 };
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218
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219 file "/var/log/cisco.log" {
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220 pattern "Internet_Firewall denied (tcp|udp) ([^(]*)" {
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221 index 2; // zero based
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222 bucket 200;
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223 message "cisco firewall blocked packet";
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224 };
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225 };
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226
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227 file "/var/log/secure" {
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228 pattern "sshd.*Failed password .* from ::ffff:(.*) port" {
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229 index 1; // zero based
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230 bucket 400;
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231 message "ssh failed password";
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232 };
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233 pattern "sshd.*Failed password .* from (.*) port" {
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234 index 1; // zero based
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235 bucket 400;
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236 message "ssh failed password";
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237 };
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238 };
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239
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240 file "/var/log/httpd/access_log" {
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241 pattern "(.*) - - .* /cgi-bin" {
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242 index 1; // zero based
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243 bucket 400;
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244 message "apache cgi-bin reference";
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245 };
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246 pattern "(.*) - - .*/index2.php" {
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247 index 1; // zero based
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248 bucket 400;
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249 message "apache index2.php reference";
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250 };
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251 pattern "(.*) - - .*/main.php" {
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252 index 1; // zero based
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253 bucket 400;
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254 message "apache main.php reference";
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255 };
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256 };
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257
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258 file "/var/log/maillog" {
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259 pattern "lost input channel from .* \[(.*)\] .* after mail" {
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260 index 1; // zero based
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261 bucket 200;
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262 message "sendmail spammer dropping connection";
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263 };
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264 };
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265
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266 file "/var/log/messages" {
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267 pattern "sshd.pam_unix.*authentication failure.*rhost=(.*) user=" {
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268 index 1; // zero based
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269 bucket 300;
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270 message "ssh failed password";
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271 };
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272 pattern "sshd.pam_unix.*authentication failure.*rhost=(.*)$" {
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273 index 1; // zero based
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274 bucket 300;
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275 message "ssh failed password";
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276 };
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277 };]]></literallayout>
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278 </refsect1>
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279
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280 <refsect1 id='version.5'>
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281 <title>Version</title>
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282 <para>
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283 @VERSION@
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284 </para>
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285 </refsect1>
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286
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287 </refentry>
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288 </reference>