This section describes the configuration and
installation of the suEXEC feature with the
(If you use Apache 1.3 you may want to use the Apache AutoConf-style interface (APACI) which is described in the main suEXEC document).
EDITING THE SUEXEC HEADER
- From the top-level of the Apache source tree, type:
suexec.h file and change
the following macros to match your local Apache
/* * 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"
COMPILING THE SUEXEC
You now need to compile the suEXEC wrapper. At the shell command prompt, after compiling Apache, type:
suexec[ENTER]. This should create the
suexec wrapper executable.
COMPILING APACHE FOR USE WITH
By default, Apache is compiled to look for the suEXEC wrapper in the following location.
/* The path to the suExec wrapper, can be overridden in Configuration */ #ifndef SUEXEC_BIN #define SUEXEC_BIN HTTPD_ROOT "/sbin/suexec" #endif
If your installation requires location of the
wrapper program in a different directory, either add
to your CFLAGS (or edit src/include/httpd.h) and recompile your
Apache server. See Compiling and
Installing Apache (and the INSTALL file in the
source distribution) for more info on this process.
COPYING THE SUEXEC BINARY TO ITS PROPER
Copy the suexec executable created in the exercise above to the defined location for SUEXEC_BIN.
In order for the wrapper to set the user ID, it must be installed as owner root and must have the setuserid execution bit set for file modes. If you are not running a root user shell, do so now and execute the following commands.
chmod 4711 /usr/local/apache/sbin/suexec
After properly installing the
suexec wrapper executable, you must kill and
restart the Apache server. A simple
kill -1 `cat
httpd.pid` will not be enough. Upon startup of
the web-server, if Apache finds a properly configured
suexec wrapper, it will print the following
message to the console (Apache 1.2):
Configuring Apache for use with suexec wrapper.If you use Apache 1.3 the following message is printed to the error log:
[notice] suEXEC mechanism enabled (wrapper: /path/to/suexec)
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 setuid root. Check your installation and try again.
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