1 <?xml version="1.0" encoding="ISO-8859-1"?>
2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
3 <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
4 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
5 This file is generated from xml source: DO NOT EDIT
6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
8 <title>mod_log_forensic - Apache HTTP Server Version 2.5</title>
9 <link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
10 <link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
11 <link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" />
12 <script src="../style/scripts/prettify.min.js" type="text/javascript">
15 <link href="../images/favicon.ico" rel="shortcut icon" /></head>
17 <div id="page-header">
18 <p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
19 <p class="apache">Apache HTTP Server Version 2.5</p>
20 <img alt="" src="../images/feather.gif" /></div>
21 <div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
23 <a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Modules</a></div>
24 <div id="page-content">
25 <div id="preamble"><h1>Apache Module mod_log_forensic</h1>
27 <p><span>Available Languages: </span><a href="../en/mod/mod_log_forensic.html" title="English"> en </a> |
28 <a href="../ja/mod/mod_log_forensic.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
29 <a href="../tr/mod/mod_log_forensic.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
31 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Forensic Logging of the requests made to the server</td></tr>
32 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
33 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>log_forensic_module</td></tr>
34 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_log_forensic.c</td></tr></table>
37 <p>This module provides for forensic logging of client
38 requests. Logging is done before and after processing a request, so the
39 forensic log contains two log lines for each request.
40 The forensic logger is very strict, which means:</p>
43 <li>The format is fixed. You cannot modify the logging format at
45 <li>If it cannot write its data, the child process
46 exits immediately and may dump core (depending on your
47 <code class="directive"><a href="../mod/mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></code>
51 <p>The <code>check_forensic</code> script, which can be found in the
52 distribution's support directory, may be helpful in evaluating the
53 forensic log output.</p>
55 <div id="quickview"><h3>Topics</h3>
57 <li><img alt="" src="../images/down.gif" /> <a href="#formats">Forensic Log Format</a></li>
58 <li><img alt="" src="../images/down.gif" /> <a href="#security">Security Considerations</a></li>
59 </ul><h3 class="directives">Directives</h3>
61 <li><img alt="" src="../images/down.gif" /> <a href="#forensiclog">ForensicLog</a></li>
65 <li><a href="../logs.html">Apache Log Files</a></li>
66 <li><code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code></li>
67 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
68 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
70 <h2><a name="formats" id="formats">Forensic Log Format</a></h2>
71 <p>Each request is logged two times. The first time is <em>before</em> it's
72 processed further (that is, after receiving the headers). The second log
73 entry is written <em>after</em> the request processing at the same time
74 where normal logging occurs.</p>
76 <p>In order to identify each request, a unique request ID is assigned.
77 This forensic ID can be cross logged in the normal transfer log using the
78 <code>%{forensic-id}n</code> format string. If you're using
79 <code class="module"><a href="../mod/mod_unique_id.html">mod_unique_id</a></code>, its generated ID will be used.</p>
81 <p>The first line logs the forensic ID, the request line and all received
82 headers, separated by pipe characters (<code>|</code>). A sample line
83 looks like the following (all on one line):</p>
85 <div class="example"><p><code>
86 +yQtJf8CoAB4AAFNXBIEAAAAA|GET /manual/de/images/down.gif
87 HTTP/1.1|Host:localhost%3a8080|User-Agent:Mozilla/5.0 (X11;
88 U; Linux i686; en-US; rv%3a1.6) Gecko/20040216
89 Firefox/0.8|Accept:image/png, <var>etc...</var>
92 <p>The plus character at the beginning indicates that this is the first log
93 line of this request. The second line just contains a minus character and
96 <div class="example"><p><code>
97 -yQtJf8CoAB4AAFNXBIEAAAAA
100 <p>The <code>check_forensic</code> script takes as its argument the name
101 of the logfile. It looks for those <code>+</code>/<code>-</code> ID pairs
102 and complains if a request was not completed.</p>
103 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
104 <div class="section">
105 <h2><a name="security" id="security">Security Considerations</a></h2>
106 <p>See the <a href="../misc/security_tips.html#serverroot">security tips</a>
107 document for details on why your security could be compromised
108 if the directory where logfiles are stored is writable by
109 anyone other than the user that starts the server.</p>
110 <p>The log files may contain sensitive data such as the contents of
111 <code>Authorization:</code> headers (which can contain passwords), so
112 they should not be readable by anyone except the user that starts the
115 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
116 <div class="directive-section"><h2><a name="ForensicLog" id="ForensicLog">ForensicLog</a> <a name="forensiclog" id="forensiclog">Directive</a></h2>
117 <table class="directive">
118 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets filename of the forensic log</td></tr>
119 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ForensicLog <var>filename</var>|<var>pipe</var></code></td></tr>
120 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
121 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
122 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_forensic</td></tr>
124 <p>The <code class="directive">ForensicLog</code> directive is used to
125 log requests to the server for forensic analysis. Each log entry
126 is assigned a unique ID which can be associated with the request
127 using the normal <code class="directive"><a href="../mod/mod_log_config.html#customlog">CustomLog</a></code>
128 directive. <code class="module"><a href="../mod/mod_log_forensic.html">mod_log_forensic</a></code> creates a token called
129 <code>forensic-id</code>, which can be added to the transfer log
130 using the <code>%{forensic-id}n</code> format string.</p>
132 <p>The argument, which specifies the location to which
133 the logs will be written, can take one of the following two
137 <dt><var>filename</var></dt>
138 <dd>A filename, relative to the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>.</dd>
140 <dt><var>pipe</var></dt>
141 <dd>The pipe character "<code>|</code>", followed by the path
142 to a program to receive the log information on its standard
143 input. The program name can be specified relative to the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code> directive.
145 <div class="warning"><h3>Security:</h3>
146 <p>If a program is used, then it will be run as the user who
147 started <code class="program"><a href="../programs/httpd.html">httpd</a></code>. This will be root if the server was
148 started by root; be sure that the program is secure or switches to a
149 less privileged user.</p>
152 <div class="note"><h3>Note</h3>
153 <p>When entering a file path on non-Unix platforms, care should be taken
154 to make sure that only forward slashes are used even though the platform
155 may allow the use of back slashes. In general it is a good idea to always
156 use forward slashes throughout the configuration files.</p>
162 <div class="bottomlang">
163 <p><span>Available Languages: </span><a href="../en/mod/mod_log_forensic.html" title="English"> en </a> |
164 <a href="../ja/mod/mod_log_forensic.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
165 <a href="../tr/mod/mod_log_forensic.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
166 </div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
167 <script type="text/javascript"><!--//--><![CDATA[//><!--
168 var comments_shortname = 'httpd';
169 var comments_identifier = 'http://httpd.apache.org/docs/trunk/mod/mod_log_forensic.html';
171 if (w.location.hostname.toLowerCase() == "httpd.apache.org") {
172 d.write('<div id="comments_thread"><\/div>');
173 var s = d.createElement('script');
174 s.type = 'text/javascript';
176 s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier;
177 (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s);
180 d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>');
182 })(window, document);
183 //--><!]]></script></div><div id="footer">
184 <p class="apache">Copyright 2015 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
185 <p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!--
186 if (typeof(prettyPrint) !== 'undefined') {