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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 <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 </partintro>
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11
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12 <refentry id="@PACKAGE@.1">
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13 <refentryinfo>
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14 <date>2007-09-09</date>
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15 </refentryinfo>
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16
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17 <refmeta>
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18 <refentrytitle>@PACKAGE@</refentrytitle>
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19 <manvolnum>1</manvolnum>
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20 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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21 </refmeta>
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22
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23 <refnamediv id='name.1'>
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24 <refname>@PACKAGE@</refname>
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25 <refpurpose>a simple adaptive firewall</refpurpose>
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26 </refnamediv>
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27
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28 <refsynopsisdiv id='synopsis.1'>
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29 <title>Synopsis</title>
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30 <cmdsynopsis>
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31 <command>@PACKAGE@</command>
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32 <arg><option>-c</option></arg>
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33 <arg><option>-d <replaceable class="parameter">n</replaceable></option></arg>
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34 </cmdsynopsis>
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35 </refsynopsisdiv>
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36
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37 <refsect1 id='description.1'>
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38 <title>Description</title>
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39
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40 <para><command>@PACKAGE@</command> is a simple adaptive firewall. It
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41 maintains the INPUT chain of the <citerefentry>
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42 <refentrytitle>iptables</refentrytitle> <manvolnum>1</manvolnum>
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43 </citerefentry> firewall set based on syslog entries. These syslog
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44 entries are typically generated by your hardware firewall, but they
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45 could come from any source. Any syslog entry that contains a host name
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46 or ip address can be used as input to this package.</para>
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47
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48 <para>The <citerefentry> <refentrytitle>@PACKAGE@.conf</refentrytitle>
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49 <manvolnum>5</manvolnum> </citerefentry> file specifies the syslog files
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50 to be monitored, and the regular expressions (<citerefentry>
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51 <refentrytitle>regex</refentrytitle> <manvolnum>7</manvolnum>
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52 </citerefentry>) to be applied to new lines in those files. Each
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53 regular expression needs an index to specify the matching substring that
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54 contains either an ip address or host name, and a bucket count which is
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55 added to the leaky bucket for that ip address when a matching line is
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56 read from that syslog file.</para>
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57
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58 <para>Each ip address has an associated leaky bucket, which leaks one
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59 token per second. Once the bucket contains more than a configurable
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60 threshold number of tokens, that ip address is added to the INPUT chain
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61 with a DROP target. When the bucket is drained to zero, that ip address
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62 is removed from the INPUT chain.</para>
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63
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64 <para>The discussion has focused on syslog files, but any ascii text
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65 file can be used, so long as some other process appends lines to that
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66 file, and those lines containing hostname or ip addresses can be matched
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67 with some regular expression.</para>
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68
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69 <para>Considering syslog files in particular, these are normally rotated
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70 via logrotate. <command>@PACKAGE@</command> properly detects and
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71 handles this case by closing the old file, and reopening the newly
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72 created file.</para>
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73 </refsect1>
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74
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75 <refsect1 id='options.1'>
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76 <title>Options</title>
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77 <variablelist>
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78 <varlistentry>
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79 <term>-c</term>
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80 <listitem>
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81 <para>
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82 Load the configuration file, print a cannonical form
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83 of the configuration on stdout, and exit.
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84 </para>
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85 </listitem>
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86 </varlistentry>
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87 <varlistentry>
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88 <term>-d <replaceable class="parameter">n</replaceable></term>
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89 <listitem>
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90 <para>
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91 Set the debug level to <replaceable class="parameter">n</replaceable>.
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92 </para>
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93 </listitem>
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94 </varlistentry>
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95 </variablelist>
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96 </refsect1>
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97
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98 <refsect1 id='usage.1'>
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99 <title>Usage</title>
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100 <para><command>@PACKAGE@</command> -d 2</para>
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101 </refsect1>
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102
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103 <refsect1 id='configuration.1'>
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104 <title>Configuration</title>
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105 <para>
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106 The configuration file is documented in <citerefentry>
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107 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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108 </citerefentry>. Any change to the config file will cause it to be
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109 reloaded within three minutes.
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110 </para>
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111 </refsect1>
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112
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113 <refsect1 id='todo.1'>
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114 <title>TODO</title>
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115 <para>
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116 The following ideas are under consideration.
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117 </para>
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118 <para>
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119 Add a configuration option for the iptables table name in the
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120 pattern statement. This implies handling multiple tables, so each
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121 table needs its own map of ip addresses and bucket values.
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122 </para>
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123 </refsect1>
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124
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125 <refsect1 id='copyright.1'>
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126 <title>Copyright</title>
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127 <para>
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128 Copyright (C) 2007 by 510 Software Group <carl@five-ten-sg.com>
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129 </para>
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130 <para>
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131 This program is free software; you can redistribute it and/or modify it
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132 under the terms of the GNU General Public License as published by the
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133 Free Software Foundation; either version 3, or (at your option) any
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134 later version.
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135 </para>
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136 <para>
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137 You should have received a copy of the GNU General Public License along
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138 with this program; see the file COPYING. If not, please write to the
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139 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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140 </para>
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141 </refsect1>
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142
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143 <refsect1 id='version.1'>
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144 <title>CVS Version</title>
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145 <para>
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146 $Id$
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147 </para>
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148 </refsect1>
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149 </refentry>
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150
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151
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152 <refentry id="@PACKAGE@.conf.5">
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153 <refentryinfo>
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154 <date>2007-09-09</date>
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155 </refentryinfo>
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156
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157 <refmeta>
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158 <refentrytitle>@PACKAGE@.conf</refentrytitle>
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159 <manvolnum>5</manvolnum>
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160 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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161 </refmeta>
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162
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163 <refnamediv id='name.5'>
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164 <refname>@PACKAGE@.conf</refname>
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165 <refpurpose>configuration file for @PACKAGE@</refpurpose>
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166 </refnamediv>
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167
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168 <refsynopsisdiv id='synopsis.5'>
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169 <title>Synopsis</title>
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170 <cmdsynopsis>
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171 <command>@PACKAGE@.conf</command>
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172 </cmdsynopsis>
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173 </refsynopsisdiv>
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174
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175 <refsect1 id='description.5'>
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176 <title>Description</title>
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177 <para>The <command>@PACKAGE@.conf</command> configuration file is
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178 specified by this partial bnf description. The entire config file
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179 is case sensitive. All the keywords are lower case.
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180 </para>
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181
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182 <literallayout class="monospaced"><![CDATA[
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183 CONFIG := {THRESHOLD | ADD-CMD | REM-CMD | IGNORE | FILE}+
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184 THRESHOLD := "threshold" THRESHOLD-INTEGER-VALUE ";"
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185 ADD-CMD := "add_command" IPT-CMD ";"
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186 REM-CMD := "remove_command" IPT-CMD ";"
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187 IGNORE := "ignore" "{" IG-SINGLE+ "};"
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188 IG-SINGLE := IP-ADDRESS "/" CIDR-BITS ";"
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189 FILE := "file" FILENAME "{" PATTERN+ "};"
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190 PATTERN := "pattern" REGULAR-EXPRESSION "{" {INDEX | BUCKET | MESSAGE}+ "};"
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191 INDEX := "index" REGEX-INTEGER-VALUE ";"
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192 BUCKET := "bucket" BUCKET-ADD-INTEGER-VALUE ";"
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193 MESSAGE := "message" REASON ";"
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194 REASON := string to appear in syslog messages
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195 IPT-CMD := string containing exactly one %s replacement token for
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196 the ip address]]></literallayout>
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197 </refsect1>
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198
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199 <refsect1 id='sample.5'>
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200 <title>Sample</title>
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201 <literallayout class="monospaced"><![CDATA[
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202 threshold 550;
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203
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204 add_command "/sbin/iptables -I INPUT --src %s --jump DROP";
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205 remove_command "/sbin/iptables -D INPUT --src %s --jump DROP";
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206
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207 ignore {
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208 127.0.0.0/8; // localhost
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209 };
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210
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211 file "/var/log/cisco.log" {
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212 pattern "Internet_Firewall denied (tcp|udp) ([^(]*)" {
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213 index 2; // zero based
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214 bucket 200;
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215 message "cisco firewall blocked packet";
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216 };
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217 };
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218
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219 file "/var/log/secure" {
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220 pattern "sshd.*Failed password .* from ::ffff:(.*) port" {
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221 index 1; // zero based
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222 bucket 400;
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223 message "ssh failed password";
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224 };
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225 pattern "sshd.*Failed password .* from (.*) port" {
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226 index 1; // zero based
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227 bucket 400;
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228 message "ssh failed password";
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229 };
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230 };
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231
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232 file "/var/log/httpd/access_log" {
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233 pattern "(.*) - - .* /cgi-bin" {
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234 index 1; // zero based
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235 bucket 400;
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236 message "apache cgi-bin reference";
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237 };
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238 pattern "(.*) - - .*/index2.php" {
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239 index 1; // zero based
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240 bucket 400;
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241 message "apache index2.php reference";
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242 };
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243 pattern "(.*) - - .*/main.php" {
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244 index 1; // zero based
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245 bucket 400;
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246 message "apache main.php reference";
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247 };
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248 };
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249
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250 file "/var/log/maillog" {
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251 pattern "lost input channel from .* \[(.*)\] .* after mail" {
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252 index 1; // zero based
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253 bucket 200;
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254 message "sendmail spammer dropping connection";
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255 };
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256 };
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257
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258 file "/var/log/messages" {
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259 pattern "sshd.pam_unix.*authentication failure.*rhost=(.*) user=" {
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260 index 1; // zero based
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261 bucket 300;
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262 message "ssh failed password";
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263 };
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264 pattern "sshd.pam_unix.*authentication failure.*rhost=(.*)$" {
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265 index 1; // zero based
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266 bucket 300;
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267 message "ssh failed password";
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268 };
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269 };]]></literallayout>
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270 </refsect1>
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271
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272 <refsect1 id='version.5'>
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273 <title>CVS Version</title>
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274 <para>
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275 $Id$
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276 </para>
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277 </refsect1>
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278
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279 </refentry>
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280 </reference>
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