os.c revision 6f74db5fbf455d7e6ea500f444362a58daf90a6e
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/*
* This file will include OS specific functions which are not inlineable.
* Any inlineable functions should be defined in os-inline.c instead.
*/
#ifdef _OSD_POSIX
#include "os.h"
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include "apr_lib.h"
#define USER_LEN 8
typedef enum
{
bs2_unknown, /* not initialized yet. */
bs2_noFORK, /* no fork() because -X flag was specified */
bs2_FORK, /* only fork() because uid != 0 */
bs2_UFORK /* Normally, ufork() is used to switch identities. */
} bs2_ForkType;
static bs2_ForkType forktype = bs2_unknown;
static void ap_str_toupper(char *str)
{
while (*str) {
*str = apr_toupper(*str);
++str;
}
}
/* Determine the method for forking off a child in such a way as to
* set both the POSIX and BS2000 user id's to the unprivileged user.
*/
static bs2_ForkType os_forktype(int one_process)
{
/* have we checked the OS version before? If yes return the previous
* result - the OS release isn't going to change suddenly!
*/
if (forktype == bs2_unknown) {
/* not initialized yet */
/* No fork if the one_process option was set */
if (one_process) {
forktype = bs2_noFORK;
}
/* If the user is unprivileged, use the normal fork() only. */
else if (getuid() != 0) {
forktype = bs2_FORK;
}
else
forktype = bs2_UFORK;
}
return forktype;
}
/* This routine complements the setuid() call: it causes the BS2000 job
* environment to be switched to the target user's user id.
* That is important if CGI scripts try to execute native BS2000 commands.
*/
int os_init_job_environment(server_rec *server, const char *user_name, int one_process)
{
bs2_ForkType type = os_forktype(one_process);
/* We can be sure that no change to uid==0 is possible because of
* the checks in http_core.c:set_user()
*/
if (one_process) {
type = forktype = bs2_noFORK;
ap_log_error(APLOG_MARK, APLOG_ERR, 0, server,
"The debug mode of Apache should only "
"be started by an unprivileged user!");
return 0;
}
return 0;
}
/* BS2000 requires a "special" version of fork() before a setuid() call */
pid_t os_fork(const char *user)
{
pid_t pid;
char username[USER_LEN+1];
switch (os_forktype(0)) {
case bs2_FORK:
pid = fork();
break;
case bs2_UFORK:
apr_cpystrn(username, user, sizeof username);
/* Make user name all upper case - for some versions of ufork() */
ap_str_toupper(username);
pid = ufork(username);
if (pid == -1 && errno == EPERM) {
ap_log_error(APLOG_MARK, APLOG_EMERG, errno,
NULL, "ufork: Possible mis-configuration "
"for user %s - Aborting.", user);
exit(1);
}
break;
default:
pid = 0;
break;
}
return pid;
}
#else /* _OSD_POSIX */
void bs2000_os_is_not_here()
{
}
#endif /* _OSD_POSIX */