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From Carl Gieringer <>
Subject [users@httpd] Understanding suexec error with Apache 1.3.34 and PHP 4
Date Sun, 08 Jan 2006 02:28:11 GMT

I'm trying to get suexec running with php4 and a site full of .php  
pages running on a Mac OS X 10.3.9 machine.  I was experiencing silent  
failures of suexec (no entry in the  
/var/log/httpd/{suexec_log,error_log} files) so I eventually found the  
c source code that I am pretty certain contains my problem  
(apache_1.3.34/src/main/util_script.c).  I added fprintf calls to this  
source file and discovered that the conditional I have quoted below was  
failing, and therefore apache was not running my script via the suexec  
executable.  The part of the conditional that is giving me trouble is  
"(!strncmp("/~", r->uri, 2))", which I believe checks to see if the  
request is for a user file (the other checks are first to see if suexec  
is even enabled, and then secondly to see if the request is for a  
virtualhost configured to run as a different user than the apache  
server.)  I want to serve files from the user space for "csg" with an  
effective uid of "csg", but the problem appears to be this: r->uri is:  
/CGI-Executables/php4/~csg/csg/Index.php (which I understand is the CGI  
method of processing the file /~csg/csg/Index.php with the executable  
/CGI-Executables/php4 (which is /Library/WebServer/CGI-Executables/php4  
in terms of my filesystem)), and because this uri does not begin with  
"/~", suexec does not run on it.

/* util_script.c */
/* excerpted from approximately line 1140 */

/* Begin CSG Edit */
const char *testFilePath = "/var/tmp/CarlApacheText.txt"
testFile = fopen ( testFilePath, "a" );
fprintf ( testFile, "Introduction  
\nap_group_id\t%i\nuri\t%s\n\n", ap_suexec_enabled,  
r->server->server_uid, r->server->server_gid, ap_user_id, ap_group_id,  
r->uri );
fclose ( testFile );
/* End CSG Edit */

     if (ap_suexec_enabled
	&& ((r->server->server_uid != ap_user_id)
	    || (r->server->server_gid != ap_group_id)
	    || (!strncmp("/~", r->uri, 2)))) {
		/* perform more checks and then run as suexec */
	} else {
		/* don't run as suexec */

The output of the fprintf above is:

/* /var/tmp/CarlApacheText.txt */
Introduction 2
ap_suexec_enabled       1
server_uid      70
server_gid      70
ap_user_id      70
ap_group_id     70
uri     /CGI-Executables/php4/~csg/csg/Index.php

Perhaps I am running php4 incorrectly: presently I run php4 using the  
following httpd.conf and .htaccess directives:

/* httpd.conf */

<Directory /Users/csg/Sites/csg/>
     AllowOverride All

/* .htaccess */

AddType application/x-httpd-php php
Action application/x-httpd-php /CGI-Executables/php4

So in summary, I think I need to configure my apache to be serving a  
uri beginning with "/~", but I thought that the way to use php4 in cgi  
mode was to have the executable in the apache server's webspace, and  
that requests for personal files, e.g. /~csg/csg/Index.php, get  
translated to /CGI-Executables/php4/~csg/csg/Index.php.  Thank you very  
much for any help.


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