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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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11
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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>2005-12-15</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='copyright.1'>
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114 <title>Copyright</title>
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115 <para>
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116 Copyright (C) 2005 by 510 Software Group <carl@five-ten-sg.com>
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117 </para>
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118 <para>
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119 This program is free software; you can redistribute it and/or modify it
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120 under the terms of the GNU General Public License as published by the
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121 Free Software Foundation; either version 2, or (at your option) any
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122 later version.
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123 </para>
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124 <para>
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125 You should have received a copy of the GNU General Public License along
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126 with this program; see the file COPYING. If not, please write to the
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127 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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128 </para>
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129 </refsect1>
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130 </refentry>
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131
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132
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133 <refentry id="@PACKAGE@.conf.5">
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134 <refentryinfo>
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135 <date>2005-12-15</date>
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136 </refentryinfo>
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137
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138 <refmeta>
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139 <refentrytitle>@PACKAGE@.conf</refentrytitle>
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140 <manvolnum>5</manvolnum>
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141 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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142 </refmeta>
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143
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144 <refnamediv id='name.5'>
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145 <refname>@PACKAGE@.conf</refname>
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146 <refpurpose>configuration file for @PACKAGE@</refpurpose>
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147 </refnamediv>
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148
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149 <refsynopsisdiv id='synopsis.5'>
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150 <title>Synopsis</title>
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151 <cmdsynopsis>
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152 <command>@PACKAGE@.conf</command>
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153 </cmdsynopsis>
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154 </refsynopsisdiv>
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155
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156 <refsect1 id='description.5'>
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157 <title>Description</title>
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158 <para>The <command>@PACKAGE@.conf</command> configuration file is
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159 specified by this partial bnf description.</para>
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160
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161 <literallayout class="monospaced"><![CDATA[
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162 CONFIG := {THRESHOLD | IGNORE | FILE}+
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163 THRESHOLD := "threshold" THRESHOLD-INTEGER-VALUE ";"
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164 IGNORE := "ignore" "{" IG-SINGLE+ "};"
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165 IG-SINGLE := IP-ADDRESS "/" CIDR-BITS ";"
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166 FILE := "file" FILENAME "{" PATTERN+ "};"
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167 PATTERN := "pattern" REGULAR-EXPRESSION "{" {INDEX | BUCKET}+ "};"
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168 INDEX := "index" REGEX-INTEGER-VALUE ";"
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169 BUCKET := "bucket" BUCKET-ADD-INTEGER-VALUE ";"]]></literallayout>
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170 </refsect1>
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171
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172 <refsect1 id='sample.5'>
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173 <title>Sample</title>
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174 <literallayout class="monospaced"><![CDATA[
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175 threshold 550;
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176
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177 ignore {
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178 127.0.0.0/8; // localhost
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179 };
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180
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181 file "/var/log/cisco.log" {
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182 pattern "Internet_Firewall denied (tcp|udp) ([^(]*)" {
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183 index 2; // zero based
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184 bucket 200;
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185 };
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186 };
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187
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188 file "/var/log/secure" {
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189 pattern "sshd.*Failed password .* from ::ffff:(.*) port" {
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190 index 1; // zero based
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191 bucket 400;
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192 };
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193 pattern "sshd.*Failed password .* from (.*) port" {
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194 index 1; // zero based
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195 bucket 400;
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196 };
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197 };]]></literallayout>
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198 </refsect1>
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199
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200 </refentry>
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201 </reference>
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