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8 <title>mod_log_forensic - Apache HTTP Server Version 2.5</title>
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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>
69 <div class="directive-section"><h2><a name="ForensicLog" id="ForensicLog">ForensicLog</a> <a name="forensiclog" id="forensiclog">Directive</a></h2>
70 <table class="directive">
71 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets filename of the forensic log</td></tr>
72 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ForensicLog <var>filename</var>|<var>pipe</var></code></td></tr>
73 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
74 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
75 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_forensic</td></tr>
77 <p>The <code class="directive">ForensicLog</code> directive is used to
78 log requests to the server for forensic analysis. Each log entry
79 is assigned a unique ID which can be associated with the request
80 using the normal <code class="directive"><a href="../mod/mod_log_config.html#customlog">CustomLog</a></code>
81 directive. <code class="module"><a href="../mod/mod_log_forensic.html">mod_log_forensic</a></code> creates a token called
82 <code>forensic-id</code>, which can be added to the transfer log
83 using the <code>%{forensic-id}n</code> format string.</p>
85 <p>The argument, which specifies the location to which
86 the logs will be written, can take one of the following two
90 <dt><var>filename</var></dt>
91 <dd>A filename, relative to the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>.</dd>
93 <dt><var>pipe</var></dt>
94 <dd>The pipe character "<code>|</code>", followed by the path
95 to a program to receive the log information on its standard
96 input. The program name can be specified relative to the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code> directive.
98 <div class="warning"><h3>Security:</h3>
99 <p>If a program is used, then it will be run as the user who
100 started <code class="program"><a href="../programs/httpd.html">httpd</a></code>. This will be root if the server was
101 started by root; be sure that the program is secure or switches to a
102 less privileged user.</p>
105 <div class="note"><h3>Note</h3>
106 <p>When entering a file path on non-Unix platforms, care should be taken
107 to make sure that only forward slashes are used even though the platform
108 may allow the use of back slashes. In general it is a good idea to always
109 use forward slashes throughout the configuration files.</p>
114 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
115 <div class="section">
116 <h2><a name="formats" id="formats">Forensic Log Format</a></h2>
117 <p>Each request is logged two times. The first time is <em>before</em> it's
118 processed further (that is, after receiving the headers). The second log
119 entry is written <em>after</em> the request processing at the same time
120 where normal logging occurs.</p>
122 <p>In order to identify each request, a unique request ID is assigned.
123 This forensic ID can be cross logged in the normal transfer log using the
124 <code>%{forensic-id}n</code> format string. If you're using
125 <code class="module"><a href="../mod/mod_unique_id.html">mod_unique_id</a></code>, its generated ID will be used.</p>
127 <p>The first line logs the forensic ID, the request line and all received
128 headers, separated by pipe characters (<code>|</code>). A sample line
129 looks like the following (all on one line):</p>
131 <div class="example"><p><code>
132 +yQtJf8CoAB4AAFNXBIEAAAAA|GET /manual/de/images/down.gif
133 HTTP/1.1|Host:localhost%3a8080|User-Agent:Mozilla/5.0 (X11;
134 U; Linux i686; en-US; rv%3a1.6) Gecko/20040216
135 Firefox/0.8|Accept:image/png, <var>etc...</var>
138 <p>The plus character at the beginning indicates that this is the first log
139 line of this request. The second line just contains a minus character and
142 <div class="example"><p><code>
143 -yQtJf8CoAB4AAFNXBIEAAAAA
146 <p>The <code>check_forensic</code> script takes as its argument the name
147 of the logfile. It looks for those <code>+</code>/<code>-</code> ID pairs
148 and complains if a request was not completed.</p>
149 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
150 <div class="section">
151 <h2><a name="security" id="security">Security Considerations</a></h2>
152 <p>See the <a href="../misc/security_tips.html#serverroot">security tips</a>
153 document for details on why your security could be compromised
154 if the directory where logfiles are stored is writable by
155 anyone other than the user that starts the server.</p>
156 <p>The log files may contain sensitive data such as the contents of
157 <code>Authorization:</code> headers (which can contain passwords), so
158 they should not be readable by anyone except the user that starts the
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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>
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