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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="generator" content="HTML Tidy, see www.w3.org" />
<title>Apache suEXEC Support</title>
</head>
<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
vlink="#000080" alink="#FF0000">
<div align="CENTER">
<img src="images/sub.gif" alt="[APACHE DOCUMENTATION]" />
<h3>Apache HTTP Server</h3>
</div>
<h3><a id="install" name="install">Configuring & Installing
suEXEC</a></h3>
<p align="LEFT">This section describes the configuration and
installation of the suEXEC feature with the
"<code>src/Configure</code>" script.<br />
(If you use Apache 1.3 you may want to use the Apache
AutoConf-style interface (APACI) which is described in the <a
href="suexec.html">main suEXEC document</a>).</p>
<p align="LEFT"><strong>EDITING THE SUEXEC HEADER
FILE</strong><br />
- From the top-level of the Apache source tree,
type: <strong><code>cd support
[ENTER]</code></strong></p>
<p align="LEFT">Edit the <code>suexec.h</code> file and change
the following macros to match your local Apache
installation.</p>
<p align="LEFT"><em>From support/suexec.h</em></p>
<pre>
/*
* HTTPD_USER -- Define as the username under which Apache normally
* runs. This is the only user allowed to execute
* this program.
*/
#define HTTPD_USER "www"
/*
* UID_MIN -- Define this as the lowest UID allowed to be a target user
* for suEXEC. For most systems, 500 or 100 is common.
*/
#define UID_MIN 100
/*
* GID_MIN -- Define this as the lowest GID allowed to be a target group
* for suEXEC. For most systems, 100 is common.
*/
#define GID_MIN 100
/*
* USERDIR_SUFFIX -- Define to be the subdirectory under users'
* home directories where suEXEC access should
* be allowed. All executables under this directory
* will be executable by suEXEC as the user so
* they should be "safe" programs. If you are
* using a "simple" UserDir directive (ie. one
* without a "*" in it) this should be set to
* the same value. suEXEC will not work properly
* in cases where the UserDir directive points to
* a location that is not the same as the user's
* home directory as referenced in the passwd file.
*
* If you have VirtualHosts with a different
* UserDir for each, you will need to define them to
* all reside in one parent directory; then name that
* parent directory here. IF THIS IS NOT DEFINED
* PROPERLY, ~USERDIR CGI REQUESTS WILL NOT WORK!
* See the suEXEC documentation for more detailed
* information.
*/
#define USERDIR_SUFFIX "public_html"
/*
* LOG_EXEC -- Define this as a filename if you want all suEXEC
* transactions and errors logged for auditing and
* debugging purposes.
*/
#define LOG_EXEC "/usr/local/apache/logs/cgi.log" /* Need me? */
/*
* DOC_ROOT -- Define as the DocumentRoot set for Apache. This
* will be the only hierarchy (aside from UserDirs)
* that can be used for suEXEC behavior.
*/
#define DOC_ROOT "/usr/local/apache/htdocs"
/*
* SAFE_PATH -- Define a safe PATH environment to pass to CGI executables.
*
*/
#define SAFE_PATH "/usr/local/bin:/usr/bin:/bin"
</pre>
<p align="LEFT"><strong>COMPILING THE SUEXEC
WRAPPER</strong><br />
You now need to compile the suEXEC wrapper. At the shell
command prompt, after compiling Apache,
type: <strong><code>make
suexec[ENTER]</code></strong>. This should create the
<strong><em>suexec</em></strong> wrapper executable.</p>
<p align="LEFT"><strong>COMPILING APACHE FOR USE WITH
SUEXEC</strong><br />
By default, Apache is compiled to look for the suEXEC wrapper
in the following location.</p>
<p align="LEFT"><em>From src/include/httpd.h</em></p>
<pre>
/* The path to the suExec wrapper, can be overridden in Configuration */
#ifndef SUEXEC_BIN
#define SUEXEC_BIN HTTPD_ROOT "/sbin/suexec"
#endif
</pre>
<p align="LEFT">If your installation requires location of the
wrapper program in a different directory, either add
<code>-DSUEXEC_BIN=\"<em></your/path/to/suexec></em>\"</code>
to your CFLAGS (or edit src/include/httpd.h) and recompile your
Apache server. See <a href="install.html">Compiling and
Installing Apache</a> (and the <samp>INSTALL</samp> file in the
source distribution) for more info on this process.</p>
<p align="LEFT"><strong>COPYING THE SUEXEC BINARY TO ITS PROPER
LOCATION</strong><br />
Copy the <strong><em>suexec</em></strong> executable created
in the exercise above to the defined location for
<strong>SUEXEC_BIN</strong>.</p>
<p align="LEFT"><strong><code>cp suexec
/usr/local/apache/sbin/suexec [ENTER]</code></strong></p>
<p align="LEFT">In order for the wrapper to set the user ID, it
must be installed as owner <strong><em>root</em></strong> and
must have the setuserid execution bit set for file modes. If
you are not running a <strong><em>root</em></strong> user
shell, do so now and execute the following commands.</p>
<p align="LEFT"><strong><code>chown root
/usr/local/apache/sbin/suexec [ENTER]</code></strong><br />
<strong><code>chmod 4711 /usr/local/apache/sbin/suexec
[ENTER]</code></strong></p>
<h3><a id="enable" name="enable">Enabling & Disabling
suEXEC</a></h3>
<p align="LEFT">After properly installing the
<strong>suexec</strong> wrapper executable, you must kill and
restart the Apache server. A simple <strong><code>kill -1 `cat
httpd.pid`</code></strong> will not be enough. Upon startup of
the web-server, if Apache finds a properly configured
<strong>suexec</strong> wrapper, it will print the following
message to the console (Apache 1.2):</p>
<pre>
Configuring Apache for use with suexec wrapper.
</pre>
If you use Apache 1.3 the following message is printed to the
error log:
<pre>
[notice] suEXEC mechanism enabled (wrapper: <em>/path/to/suexec</em>)
</pre>
<p align="LEFT">If you don't see this message at server
startup, the server is most likely not finding the wrapper
program where it expects it, or the executable is not installed
<strong><em>setuid root</em></strong>. Check your installation
and try again.</p>
<p align="CENTER"><strong><a href="suexec.html">BACK TO MAIN
PAGE</a></strong></p>
<hr />
<h3 align="CENTER">Apache HTTP Server</h3>
<a href="./"><img src="images/index.gif" alt="Index" /></a>
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